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1,803.05667
|
A Study of Recent Contributions on Information Extraction
|
This paper reports on modern approaches in Information Extraction (IE) and
its two main sub-tasks of Named Entity Recognition (NER) and Relation
Extraction (RE). Basic concepts and the most recent approaches in this area are
reviewed, which mainly include Machine Learning (ML) based approaches and the
more recent trend to Deep Learning (DL) based methods.
|
cs.IR cs.CL
|
this paper reports on modern approaches in information extraction ie and its two main subtasks of named entity recognition ner and relation extraction re basic concepts and the most recent approaches in this area are reviewed which mainly include machine learning ml based approaches and the more recent trend to deep learning dl based methods
|
[['this', 'paper', 'reports', 'on', 'modern', 'approaches', 'in', 'information', 'extraction', 'ie', 'and', 'its', 'two', 'main', 'subtasks', 'of', 'named', 'entity', 'recognition', 'ner', 'and', 'relation', 'extraction', 're', 'basic', 'concepts', 'and', 'the', 'most', 'recent', 'approaches', 'in', 'this', 'area', 'are', 'reviewed', 'which', 'mainly', 'include', 'machine', 'learning', 'ml', 'based', 'approaches', 'and', 'the', 'more', 'recent', 'trend', 'to', 'deep', 'learning', 'dl', 'based', 'methods']]
|
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|
1,803.05668
|
Reliable numerical solution of a class of nonlinear elliptic problems
generated by the Poisson-Boltzmann equation
|
We consider a class of nonlinear elliptic problems associated with models in
biophysics, which are described by the Poisson-Boltzmann equation (PBE). We
prove mathematical correctness of the problem, study a suitable class of
approximations, and deduce guaranteed and fully computable bounds of
approximation errors. The latter goal is achieved by means of the approach
suggested in [S. Repin, A posteriori error estimation for variational problems
with uniformly convex functionals. Math. Comp., 69:481-500, 2000] for convex
variational problems. Moreover, we establish the error identity, which defines
the error measure natural for the considered class of problems and show that it
yields computable majorants and minorants of the global error as well as
indicators of local errors that provide efficient adaptation of meshes.
Theoretical results are confirmed by a collection of numerical tests that
includes problems on $2D$ and $3D$ Lipschitz domains.
|
math.NA
|
we consider a class of nonlinear elliptic problems associated with models in biophysics which are described by the poissonboltzmann equation pbe we prove mathematical correctness of the problem study a suitable class of approximations and deduce guaranteed and fully computable bounds of approximation errors the latter goal is achieved by means of the approach suggested in s repin a posteriori error estimation for variational problems with uniformly convex functionals math comp 69481500 2000 for convex variational problems moreover we establish the error identity which defines the error measure natural for the considered class of problems and show that it yields computable majorants and minorants of the global error as well as indicators of local errors that provide efficient adaptation of meshes theoretical results are confirmed by a collection of numerical tests that includes problems on 2d and 3d lipschitz domains
|
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|
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|
1,803.05669
|
The compensation for the edge focusing of chicane bump magnets by
harmonic injection in CSNS/RCS
|
In the Rapid Cycling Synchrotron(RCS) of China Spallation Neutron
Source(CSNS), transverse painting injection is employed to suppress the
space-charge effects. The beta-beating caused by edge focusing of the injection
bump magnets leads to tune shift and shrinkage of the acceptance, which may
result in additional beam loss. In RCS, the main quadrupoles are excited by
White resonant power supplies, and the exciting current cannot be arbitrarily
programed. Generally, this kind of perturbation could be corrected by
trim-quadrupole, however, we don't have trim-quadrupole in CSNS/RCS. A new
method based on the harmonic injection is firstly introduced to compensate the
beta-beating caused by edge focusing of the chicane bump magnets at RCS. In
this paper, the principle and feasibility of compensation scheme were
presented. The simulation study was done on the application of the new method
to the CSNS/RCS, and the results show the validity and effectiveness of the
method.
|
physics.acc-ph
|
in the rapid cycling synchrotronrcs of china spallation neutron sourcecsns transverse painting injection is employed to suppress the spacecharge effects the betabeating caused by edge focusing of the injection bump magnets leads to tune shift and shrinkage of the acceptance which may result in additional beam loss in rcs the main quadrupoles are excited by white resonant power supplies and the exciting current cannot be arbitrarily programed generally this kind of perturbation could be corrected by trimquadrupole however we dont have trimquadrupole in csnsrcs a new method based on the harmonic injection is firstly introduced to compensate the betabeating caused by edge focusing of the chicane bump magnets at rcs in this paper the principle and feasibility of compensation scheme were presented the simulation study was done on the application of the new method to the csnsrcs and the results show the validity and effectiveness of the method
|
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|
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|
1,803.0567
|
Optimizing City-Wide White-Fi Networks in TV White Spaces
|
White-Fi refers to WiFi deployed in the TV white spaces. Unlike its ISM band
counterparts, White-Fi must obey requirements that protect TV reception. As a
result, optimization of citywide White-Fi networks faces the challenges of
heterogeneous channel availability and link quality, over location. The former
is because, at any location, channels in use by TV networks are not available
for use by White-Fi. The latter is because the link quality achievable at a
White-Fi receiver is determined by not only its link gain to its transmitter
but also by its link gains to TV transmitters and its transmitter's link gains
to TV receivers.
In this work, we model the medium access control (MAC) throughput of a
White-Fi network. We propose heuristic algorithms to optimize the throughput,
given the described heterogeneity. The algorithms assign power, access
probability, and channels to nodes in the network, under the constraint that
reception at TV receivers is not compromised. We evaluate the efficacy of our
approach over example city-wide White-Fi networks deployed over Denver and
Columbus (respectively, low and high channel availability) in the USA, and
compare with assignments cognizant of heterogeneity to a lesser degree, for
example, akin to FCC regulations.
|
cs.NI
|
whitefi refers to wifi deployed in the tv white spaces unlike its ism band counterparts whitefi must obey requirements that protect tv reception as a result optimization of citywide whitefi networks faces the challenges of heterogeneous channel availability and link quality over location the former is because at any location channels in use by tv networks are not available for use by whitefi the latter is because the link quality achievable at a whitefi receiver is determined by not only its link gain to its transmitter but also by its link gains to tv transmitters and its transmitters link gains to tv receivers in this work we model the medium access control mac throughput of a whitefi network we propose heuristic algorithms to optimize the throughput given the described heterogeneity the algorithms assign power access probability and channels to nodes in the network under the constraint that reception at tv receivers is not compromised we evaluate the efficacy of our approach over example citywide whitefi networks deployed over denver and columbus respectively low and high channel availability in the usa and compare with assignments cognizant of heterogeneity to a lesser degree for example akin to fcc regulations
|
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|
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|
1,803.05671
|
Spectral radii of asymptotic mappings and the convergence speed of the
standard fixed point algorithm
|
Important problems in wireless networks can often be solved by computing
fixed points of standard or contractive interference mappings, and the
conventional fixed point algorithm is widely used for this purpose. Knowing
that the mapping used in the algorithm is not only standard but also
contractive (or only contractive) is valuable information because we obtain a
guarantee of geometric convergence rate, and the rate is related to a property
of the mapping called modulus of contraction. To date, contractive mappings and
their moduli of contraction have been identified with case-by-case approaches
that can be difficult to generalize. To address this limitation of existing
approaches, we show in this study that the spectral radii of asymptotic
mappings can be used to identify an important subclass of contractive mappings
and also to estimate their moduli of contraction. In addition, if the fixed
point algorithm is applied to compute fixed points of positive concave
mappings, we show that the spectral radii of asymptotic mappings provide us
with simple lower bounds for the estimation error of the iterates. An immediate
application of this result proves that a known algorithm for load estimation in
wireless networks becomes slower with increasing traffic.
|
eess.SP cs.NA math.NA math.OC
|
important problems in wireless networks can often be solved by computing fixed points of standard or contractive interference mappings and the conventional fixed point algorithm is widely used for this purpose knowing that the mapping used in the algorithm is not only standard but also contractive or only contractive is valuable information because we obtain a guarantee of geometric convergence rate and the rate is related to a property of the mapping called modulus of contraction to date contractive mappings and their moduli of contraction have been identified with casebycase approaches that can be difficult to generalize to address this limitation of existing approaches we show in this study that the spectral radii of asymptotic mappings can be used to identify an important subclass of contractive mappings and also to estimate their moduli of contraction in addition if the fixed point algorithm is applied to compute fixed points of positive concave mappings we show that the spectral radii of asymptotic mappings provide us with simple lower bounds for the estimation error of the iterates an immediate application of this result proves that a known algorithm for load estimation in wireless networks becomes slower with increasing traffic
|
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|
[-0.10268282181017899, 0.027305164763006637, -0.09544357868405628, 0.0837671040166502, -0.07449928170773296, -0.17133464827915007, 0.06547427218055771, 0.3974891891512944, -0.3180228293854363, -0.22739879812627117, 0.14943288837984794, -0.2354092576293921, -0.17921220564802548, 0.21149242393748494, -0.13875387697385586, 0.09281188445355819, 0.04932158472187513, 0.050295443104357906, -0.11116731625789188, -0.2552820822908258, 0.328440054828225, 0.049537029074581, 0.25198811085832934, 0.07047065050395833, 0.08237626713852646, -0.024497209031286896, -0.026346009284048816, 0.01748415167005115, -0.1361360928677845, 0.1214732738492098, 0.2899012568321231, 0.17016364069422707, 0.2946927091486904, -0.37892182502534466, -0.2018275018733907, 0.20069396392530192, 0.17783774552885823, 0.0635408678030291, -0.037678330576009285, -0.2405187234185085, 0.13026516588300238, -0.11304087036441328, -0.11564399588054844, -0.10394859276426842, -0.014648182861677999, 0.054962192271237394, -0.315842433977511, 0.02653463742409462, 0.1023504316702257, 0.04754074606379228, -0.04915815566212642, -0.08206628626735159, 0.012979053310118616, 0.16178715165599952, 0.056993713653503864, 0.07422387446229327, 0.11010725676362422, -0.07574559718712556, -0.09793253336398748, 0.3653505526635112, -0.03748954112085571, -0.21572644992883563, 0.189174458825229, -0.09959216155610713, -0.14439788861414038, 0.12995072243716188, 0.18139765892778903, 0.14101107057887224, -0.16665418711680996, 0.09327855708709519, -0.03153551240660706, 0.14687123192546708, 0.07321814235242806, 0.029219800196540524, 0.14476220001174345, 0.12254073679190586, 0.16067081986931248, 0.14889396672738164, -0.03531191355254197, -0.07354661111472821, -0.25951576355977785, -0.13999422330751407, -0.19325300578351076, 0.04747693819281638, -0.12835771525581605, -0.17045216128759905, 0.3535099292128841, 0.1637427612381265, 0.2136455471080975, 0.10329681227568119, 0.28533048849856973, 0.1289052873308181, 0.08907462969868996, 0.10338522149107363, 0.24831135023613365, 0.12255618636073469, 0.04388012280855482, -0.15665909848698623, 0.07630625270231038, 0.11179612248147629]
|
1,803.05672
|
Halogen-Bond Driven Self-Assembly of Perfluorocarbon Monolayers
|
The self-assembly of a single layer of organic molecules on a substrate is a
powerful strategy to modify surfaces and interfacial properties. The detailed
interplay of molecule-to-substrate and molecule-molecule interactions are
crucial for the preparation of stable and uniform monomolecular coatings.
Thiolates, silanes, phosphonates and carboxylates are widely used head-groups
to link organic molecules to specific surfaces study we show that self-assembly
of stable and highly compact monolayers of perfluorocarbons. Remarkably, the
lowest ever reported surface energy of 2.6 mJ m-2 was measured for a
perfluorododecyl iodide monolayer on a silicon nitride substrate. As a
convenient, flexible and simple method, the self-assembly of halogen-bond
driven perfluorocarbon monolayers is compatible with several applications,
ranging from biosensing to electronics and microfluidics. Compared to other
methods used to functionalise surfaces and interfaces, our procedure offers the
unique advantage to work with extremely inert perfluorinated solvents. We
demonstrate that surfaces commonly unstable in contact with many common organic
solvents, such as organic-inorganic perovskites, can be functionalized via
halogen bonding.
|
physics.chem-ph physics.app-ph
|
the selfassembly of a single layer of organic molecules on a substrate is a powerful strategy to modify surfaces and interfacial properties the detailed interplay of moleculetosubstrate and moleculemolecule interactions are crucial for the preparation of stable and uniform monomolecular coatings thiolates silanes phosphonates and carboxylates are widely used headgroups to link organic molecules to specific surfaces study we show that selfassembly of stable and highly compact monolayers of perfluorocarbons remarkably the lowest ever reported surface energy of 26 mj m2 was measured for a perfluorododecyl iodide monolayer on a silicon nitride substrate as a convenient flexible and simple method the selfassembly of halogenbond driven perfluorocarbon monolayers is compatible with several applications ranging from biosensing to electronics and microfluidics compared to other methods used to functionalise surfaces and interfaces our procedure offers the unique advantage to work with extremely inert perfluorinated solvents we demonstrate that surfaces commonly unstable in contact with many common organic solvents such as organicinorganic perovskites can be functionalized via halogen bonding
|
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|
[-0.08916909345069746, 0.1303248304790657, -0.04670826063430601, -0.0041116412156587765, -0.022511204580070488, -0.21924951608488513, 0.049482462871345174, 0.4532979303988729, -0.23170987739981075, -0.30400331326831537, 0.009547819779773545, -0.2759235774902449, -0.18746794222195626, 0.2358212695726947, -0.02797630822466194, 0.05536375766928504, 0.021319437662293765, -0.12491136440520834, -0.029265402270492853, -0.1808549318059235, 0.2241806367732537, 0.06154154206679505, 0.309030707973014, 0.11824985047517593, 0.0914377100842821, -0.050700228372114194, 0.11449992607768839, -0.0147416558395478, -0.18552405687887297, 0.1905493921078267, 0.28088217001010896, -0.09166638842030506, 0.1833096328903298, -0.4867783261071535, -0.2500588679404419, 0.037976963604225, 0.11178805109982491, 0.12568624800510086, -0.12176191573017159, -0.2235915238322441, 0.09110900078259504, -0.13718983386257652, -0.10381926302234554, -0.10177609097111709, -0.007754460537723105, 0.06828415938831012, -0.21624900350846932, 0.011568580120861245, 0.02030567756029451, 0.05649615569740154, -0.07288458457388648, -0.16650039446985077, -0.10346270112578822, 0.08777670694550702, 0.004861305346178591, -0.013425480187307022, 0.26039890901061, -0.10095974755218359, -0.07980394416494639, 0.4381885500090897, -0.07010666912445312, -0.1514575182798372, 0.3009700144575849, -0.0777033288395151, -0.09130292317255735, 0.1846338139852853, 0.15498502730765634, 0.16929318221392714, -0.17536753732236518, 0.03131593948906394, 0.03340841549193593, 0.20212263130185426, 0.11306485929378089, 0.039356638828684, 0.22171497936093598, 0.2621289508077642, 0.03260743782587148, 0.1377933009388222, -0.06915787928055521, -0.048049131271897985, -0.14588053640761192, -0.28078945470042527, -0.16311299081322303, 0.049042001735974415, -0.05062026436964145, -0.2136080957634766, 0.3472129052985388, 0.053129186190959146, 0.12352413825904297, -0.056867299631095616, 0.24953772749597575, -0.02900521227701383, 0.09377115456517904, -0.07320776195591612, 0.2337148755248992, 0.16872448006431293, 0.06472840002933695, -0.16789410216882114, 0.09538469039746056, -0.015417710375218729]
|
1,803.05673
|
The Hot Hand in Professional Darts
|
We investigate the hot hand hypothesis in professional darts in a near-ideal
setting with minimal to no interaction between players. Considering almost one
year of tournament data, corresponding to 167,492 dart throws in total, we use
state-space models to investigate serial dependence in throwing performance. In
our models, a latent state process serves as a proxy for a player's underlying
ability, and we use autoregressive processes to model how this process evolves
over time. We find a strong but short-lived serial dependence in the latent
state process, thus providing evidence for the existence of the hot hand.
|
stat.AP
|
we investigate the hot hand hypothesis in professional darts in a nearideal setting with minimal to no interaction between players considering almost one year of tournament data corresponding to 167492 dart throws in total we use statespace models to investigate serial dependence in throwing performance in our models a latent state process serves as a proxy for a players underlying ability and we use autoregressive processes to model how this process evolves over time we find a strong but shortlived serial dependence in the latent state process thus providing evidence for the existence of the hot hand
|
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|
[-0.0850802238540685, 0.07628437266369777, -0.12336896781926043, 0.11234783626997569, -0.1038410934706917, -0.14609273808794873, 0.117799866052034, 0.4317594161693705, -0.26350653888463665, -0.31519237141280126, 0.08845061365233657, -0.2840336898613411, -0.10666806161558877, 0.15105494895396987, -0.06056368117181895, 0.015440264580926547, 0.07034439125466936, 0.035138613457093015, -0.013779569077693546, -0.2404919028219107, 0.2879348388863339, 0.07350785945163807, 0.2461756987552993, 0.026737804529451143, 0.12271693349005848, 0.026219096922432072, -0.025752524864704657, -0.02884272767399428, -0.09144954178676319, 0.05059206244186498, 0.23283525602323607, 0.1558415906135148, 0.3205101324710995, -0.42887021519224316, -0.21466735121551514, 0.15384405078657437, 0.09970892216855039, 0.090125731168276, -0.024975981398407992, -0.23764723750840253, 0.02162276337185176, -0.1783428901374767, -0.09115542381914565, -0.05599227926965492, 0.011086303541863648, -0.029809716303134337, -0.29458277439698577, 0.0811042492374933, 0.08180913794300675, 0.04780734128629168, -0.058997747038423164, -0.07606671943600911, -0.031854709772839364, 0.15299874494667165, 0.07494681834729515, -0.006586267709887276, 0.10323089130300407, -0.16033113090816187, -0.17348983238237756, 0.35180418837505084, -0.125787627849301, -0.17261935504696643, 0.21506487403530627, -0.15125753876539724, -0.14253670609711358, 0.0689907477547725, 0.24022715214717513, 0.10027515409941164, -0.13516627270534323, 0.012262637221889841, -0.04848862923002647, 0.20776333480413692, 0.02664639267216747, 0.005765908236450438, 0.19180553865104835, 0.24412128351589976, 0.05305885228638848, 0.1702236778801307, -0.06298584858692872, -0.16665718815329456, -0.2664357921651875, -0.15609470037937476, -0.11659750501955084, 0.04014815361733781, -0.08974848664835615, -0.167345640938341, 0.4006028270135478, 0.20189906677842373, 0.2240101991337724, 0.05539458087878302, 0.28666890049741295, 0.05022096893905351, 0.03914950961188879, 0.10913802214781754, 0.16154435664551178, 0.08140745433047414, 0.09516237887995278, -0.17458259245419563, 0.14396452243090607, -0.004297466441736712]
|
1,803.05674
|
Hydrogel menisci: Shape, interaction, and instability
|
The interface of a soft hydrogel is easily deformed when it is in contact
with particles, droplets or cells. Here we compute the intricate shapes of
hydrogel menisci due to the indentation of point particles. The analysis is
based on a free energy formulation, by which we also assess the interaction
laws between neighbouring particles on hydrogel interfaces, similar to the
"Cheerios effect". It is shown how the meniscus formed around the particles
results from a competition between surface tension, elasticity and hydrostatic
pressure inside the gel. We provide a detailed overview of the various scaling
laws, which are governed by a characteristic shear modulus
$G^*=\sqrt{\gamma\rho g}$ that is based on surface tension $\gamma$ and gravity
$\rho g$. Stiffer materials exhibit a solid-like response while softer
materials are more liquid-like. The importance of $G^*$ is further illustrated
by examining the Rayleigh-Taylor instability of soft hydrogels.
|
cond-mat.soft
|
the interface of a soft hydrogel is easily deformed when it is in contact with particles droplets or cells here we compute the intricate shapes of hydrogel menisci due to the indentation of point particles the analysis is based on a free energy formulation by which we also assess the interaction laws between neighbouring particles on hydrogel interfaces similar to the cheerios effect it is shown how the meniscus formed around the particles results from a competition between surface tension elasticity and hydrostatic pressure inside the gel we provide a detailed overview of the various scaling laws which are governed by a characteristic shear modulus gsqrtgammarho g that is based on surface tension gamma and gravity rho g stiffer materials exhibit a solidlike response while softer materials are more liquidlike the importance of g is further illustrated by examining the rayleightaylor instability of soft hydrogels
|
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|
[-0.12214756956705565, 0.24326386795211066, -0.1568211634035429, 0.02355386943963822, -0.06696602607715046, -0.13947137784109348, 0.017681933105147134, 0.3679212977618186, -0.26123316906159744, -0.2973123745873131, 0.0500970625168217, -0.30344840190890765, -0.195198907620377, 0.1490509513904625, -0.007536371655684586, 0.017741246622689586, 0.017520607435370848, -0.023100525575500797, -0.02387105353894488, -0.1519739243085496, 0.30844984193875763, 0.0447374907348098, 0.3015493683342356, 0.10343183534051706, 0.06312059515686189, -0.01830644451709102, 0.034184055283225864, 0.10516071281098346, -0.21210275587696337, 0.0808281186230791, 0.1705066964006821, -0.052682813609458715, 0.21189241586641097, -0.4759318273411029, -0.2282150712908333, 0.056308975672840864, 0.09928196498852533, 0.06177154726982634, -0.04689780056620899, -0.25226238612150254, 0.04872125232618095, -0.1303704657960528, -0.12995843152425046, -0.026506109913397167, 0.05168638423492666, 0.04234545627089877, -0.19903520395746455, 0.1250626774900512, 0.039176606243321054, 0.05136760376626626, -0.09717269958410826, -0.08062910386555207, -0.08427586712140409, 0.07323829276497741, 0.10463656119827647, -0.002349224803361317, 0.26586440688374247, -0.16402978250536965, 0.015116753755137324, 0.42047036146848565, -0.009461032365733344, -0.19148437262305784, 0.23708640709648737, -0.12837831140172462, -0.05107321203023377, 0.20015204115770757, 0.16262497104374538, 0.08727714512739719, -0.1398767751772741, 0.045911235488246244, -0.005295633149216883, 0.17800700312586237, 0.09479821401247238, -0.0860438796710999, 0.25042807391016847, 0.22996725575972554, 0.022849315053058997, 0.19090722111124908, -0.06057799189228616, -0.04280302409380157, -0.2850687997803713, -0.1747037004647104, -0.18285799307179534, 0.02640864553541178, -0.12535637983152506, -0.18897408433965918, 0.3129585728359719, 0.06134961115377438, 0.15295618367074187, 0.035366077996311814, 0.24964509468635596, 0.04162580965526609, 0.05912908072867948, 0.05068581372163155, 0.2808271361928847, 0.16177532821408627, 0.08168308093445376, -0.24787814327767896, 0.08027848184186344, 0.06729581201862958]
|
1,803.05675
|
Training of Convolutional Networks on Multiple Heterogeneous Datasets
for Street Scene Semantic Segmentation
|
We propose a convolutional network with hierarchical classifiers for
per-pixel semantic segmentation, which is able to be trained on multiple,
heterogeneous datasets and exploit their semantic hierarchy. Our network is the
first to be simultaneously trained on three different datasets from the
intelligent vehicles domain, i.e. Cityscapes, GTSDB and Mapillary Vistas, and
is able to handle different semantic level-of-detail, class imbalances, and
different annotation types, i.e. dense per-pixel and sparse bounding-box
labels. We assess our hierarchical approach, by comparing against flat,
non-hierarchical classifiers and we show improvements in mean pixel accuracy of
13.0% for Cityscapes classes and 2.4% for Vistas classes and 32.3% for GTSDB
classes. Our implementation achieves inference rates of 17 fps at a resolution
of 520x706 for 108 classes running on a GPU.
|
cs.CV cs.LG
|
we propose a convolutional network with hierarchical classifiers for perpixel semantic segmentation which is able to be trained on multiple heterogeneous datasets and exploit their semantic hierarchy our network is the first to be simultaneously trained on three different datasets from the intelligent vehicles domain ie cityscapes gtsdb and mapillary vistas and is able to handle different semantic levelofdetail class imbalances and different annotation types ie dense perpixel and sparse boundingbox labels we assess our hierarchical approach by comparing against flat nonhierarchical classifiers and we show improvements in mean pixel accuracy of 130 for cityscapes classes and 24 for vistas classes and 323 for gtsdb classes our implementation achieves inference rates of 17 fps at a resolution of 520x706 for 108 classes running on a gpu
|
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|
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|
1,803.05676
|
Efficient First-order Methods for Convex Minimization: a Constructive
Approach
|
We describe a novel constructive technique for devising efficient first-order
methods for a wide range of large-scale convex minimization settings, including
smooth, non-smooth, and strongly convex minimization. The technique builds upon
a certain variant of the conjugate gradient method to construct a family of
methods such that a) all methods in the family share the same worst-case
guarantee as the base conjugate gradient method, and b) the family includes a
fixed-step first-order method. We demonstrate the effectiveness of the approach
by deriving optimal methods for the smooth and non-smooth cases, including new
methods that forego knowledge of the problem parameters at the cost of a
one-dimensional line search per iteration, and a universal method for the union
of these classes that requires a three-dimensional search per iteration. In the
strongly convex case, we show how numerical tools can be used to perform the
construction, and show that the resulting method offers an improved worst-case
bound compared to Nesterov's celebrated fast gradient method.
|
math.OC cs.NA math.NA
|
we describe a novel constructive technique for devising efficient firstorder methods for a wide range of largescale convex minimization settings including smooth nonsmooth and strongly convex minimization the technique builds upon a certain variant of the conjugate gradient method to construct a family of methods such that a all methods in the family share the same worstcase guarantee as the base conjugate gradient method and b the family includes a fixedstep firstorder method we demonstrate the effectiveness of the approach by deriving optimal methods for the smooth and nonsmooth cases including new methods that forego knowledge of the problem parameters at the cost of a onedimensional line search per iteration and a universal method for the union of these classes that requires a threedimensional search per iteration in the strongly convex case we show how numerical tools can be used to perform the construction and show that the resulting method offers an improved worstcase bound compared to nesterovs celebrated fast gradient method
|
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|
[-0.061976538942321954, -0.010053522780557008, -0.08812612621688548, 0.05678334393262587, -0.0816107205098012, -0.15471453594768214, 0.07484281470102293, 0.37264147741191184, -0.30879338352688024, -0.29176940046894695, 0.09140406779651702, -0.2144590471134619, -0.19199757817212815, 0.2773774129447792, -0.0857835149070547, 0.09722259479077579, 0.08012240751715446, 0.0032875166493065563, -0.1431062227595787, -0.26535250004639643, 0.2841731731033953, -0.008721548328061162, 0.28731288601080945, 0.04075822176089809, 0.13070601456005265, 0.00791400683077949, -0.012328060815271772, 0.053805816679032656, -0.11289101213530815, 0.1685098135552116, 0.24414389233254355, 0.20141710544487945, 0.3534012181615388, -0.3667903748386896, -0.21467712485029528, 0.12401735060848296, 0.13144444780608203, 0.12156855305484324, -0.07663495655826948, -0.22006749113257054, 0.0936592132611959, -0.14425748815461073, -0.1199053812450097, -0.1579612850708841, -0.0865791728720069, 0.05436379829835561, -0.3299797600089216, 0.04028402355982474, 0.09034192600189765, 0.016613536157909736, -0.048510648080228286, -0.1294743442149074, 0.03578872582587747, 0.04715291420745169, 0.011825279062498866, 0.05811213521375953, 0.10861735854349616, -0.059268806054958226, -0.14626605475298415, 0.35745805515483725, -0.09589795350315578, -0.22332350154303843, 0.18834130607551125, -0.03351309611950713, -0.14972570143714778, 0.15811212961475743, 0.22484551848919868, 0.2455741647878133, -0.1243963503971535, 0.09639087450700629, -0.04349363278482615, 0.12762999163065997, 0.01571161468818002, -0.012539677942792574, 0.0983938957610524, 0.15490652539876554, 0.18155173422340418, 0.16140416415658332, -0.06753239741859336, -0.11689352879105251, -0.2987738528035949, -0.14833681935061455, -0.18407659289314998, -0.05175039950286808, -0.1152448519459102, -0.18831049890061954, 0.3959254604292872, 0.1278362492815143, 0.1792654250288543, 0.11122832722662959, 0.333137185525517, 0.09462485989529847, 0.0425707181462196, 0.12002879345249155, 0.1873173564442514, 0.0851658592791078, 0.0629310336260033, -0.240318075446182, 0.05108997255943164, 0.1574249500653097]
|
1,803.05677
|
GJ1214: Rotation period, starspots, and uncertainty on the optical slope
of the transmission spectrum
|
Brightness inhomogeneities in the stellar photosphere (dark spots or bright
regions) affect the measurements of the planetary transmission spectrum. To
investigate the star spots of the M dwarf GJ 1214, we conducted a multicolor
photometric monitoring from 2012 to 2016. The measured variability shows a
periodicity of 125 +- 5 days, which we interpret as the signature of the
stellar rotation period. This value overrules previous suggestions of a
significantly shorter stellar rotation period. A light curve inversion of the
monitoring data yields an estimation of the flux dimming of a permanent spot
filling factor not contributing to the photometric variability, a temperature
contrast of the spots of about 370 K and persistent active longitudes. The
derived surface maps over all five seasons were used to estimate the influence
of the star spots on the transmission spectrum of the planet from 400 nm to
2000 nm. The monitoring data presented here do not support a recent
interpretation of a measured transmission spectrum of GJ 1214b as to be caused
by bright regions in the stellar photosphere. Instead, we list arguments as to
why the effect of dark spots likely dominated over bright regions in the period
of our monitoring. Furthermore, our photometry proves an increase in
variability over at least four years, indicative for a cyclic activity
behavior. The age of GJ 1214 is likely between 6 and 10 Gyr. The long-term
photometry allows for a correction of unocculted spots. For an active star such
as GJ 1214, there remains a degeneracy between occulted spots and the transit
parameters used to build the transmission spectrum. This degeneracy can only be
broken by high-precision transit photometry resolving the spot crossing
signature in the transit light curve.
|
astro-ph.SR astro-ph.EP
|
brightness inhomogeneities in the stellar photosphere dark spots or bright regions affect the measurements of the planetary transmission spectrum to investigate the star spots of the m dwarf gj 1214 we conducted a multicolor photometric monitoring from 2012 to 2016 the measured variability shows a periodicity of 125 5 days which we interpret as the signature of the stellar rotation period this value overrules previous suggestions of a significantly shorter stellar rotation period a light curve inversion of the monitoring data yields an estimation of the flux dimming of a permanent spot filling factor not contributing to the photometric variability a temperature contrast of the spots of about 370 k and persistent active longitudes the derived surface maps over all five seasons were used to estimate the influence of the star spots on the transmission spectrum of the planet from 400 nm to 2000 nm the monitoring data presented here do not support a recent interpretation of a measured transmission spectrum of gj 1214b as to be caused by bright regions in the stellar photosphere instead we list arguments as to why the effect of dark spots likely dominated over bright regions in the period of our monitoring furthermore our photometry proves an increase in variability over at least four years indicative for a cyclic activity behavior the age of gj 1214 is likely between 6 and 10 gyr the longterm photometry allows for a correction of unocculted spots for an active star such as gj 1214 there remains a degeneracy between occulted spots and the transit parameters used to build the transmission spectrum this degeneracy can only be broken by highprecision transit photometry resolving the spot crossing signature in the transit light curve
|
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|
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|
1,803.05678
|
Improving the capacity of quantum dense coding by weak measurement and
reversal measurement
|
A protocol of quantum dense coding protection of two qubits is proposed in
amplitude damping (AD) channel using weak measurement and reversal measurement.
It is found that the capacity of quantum dense coding under the weak
measurement and reversal measurement is always greater than that without weak
measurement and reversal measurement. When the protocol is applied, for the AD
channels with different damping coefficient, the result reflects that quantum
entanglement can be protected and quantum dense coding becomes successful.
|
quant-ph
|
a protocol of quantum dense coding protection of two qubits is proposed in amplitude damping ad channel using weak measurement and reversal measurement it is found that the capacity of quantum dense coding under the weak measurement and reversal measurement is always greater than that without weak measurement and reversal measurement when the protocol is applied for the ad channels with different damping coefficient the result reflects that quantum entanglement can be protected and quantum dense coding becomes successful
|
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|
[-0.2315083113911597, 0.22236487281043082, -0.05534979783564429, 0.009775048646415714, 0.001792596281753688, -0.28774381965941076, 0.06733418458223908, 0.35884884169584585, -0.2677569011391341, -0.24447158692239584, 0.10291589058558398, -0.22665167631157027, -0.11026449237148502, 0.20810232060383768, -0.05441147320066826, 0.09226747178413634, 0.07216161700507885, 0.036179549607471856, -0.06765265618097273, -0.21824571936202672, 0.2883646698031999, 0.07895308410560217, 0.3917108602067338, 0.06590268184663728, 0.05663039278286167, 0.04110959780555737, -0.010300694894092747, -0.007757760761187801, -0.06913206736176626, 0.02175098739540841, 0.23879617950996926, 0.10333345803915511, 0.18579528636381595, -0.39711101820008665, -0.24378753745857673, 0.09016022004210685, 0.11067398572694274, 0.18552755924012465, -0.051440151330213284, -0.2998473358493817, 0.13500912188068975, -0.17765320704283216, -0.015896835600179206, -0.0502963045234733, 0.027253818497816218, -0.09910064228940048, -0.32632959132153494, 0.11760184554312425, 0.07591605044995682, 0.06034642245761956, 0.010029599494949172, 0.014586856806815802, 0.032559899118127705, 0.13030485748615458, -0.010189896069254868, 0.04381013724988303, 0.15987869627962384, -0.12463905659203618, -0.1343767112769375, 0.3572949754380727, -0.0604177189298649, -0.19317351294610696, 0.15429706556230335, -0.1139628228884709, -0.09727519214200446, 0.10411219960196486, 0.10194964344241904, 0.0572616986965737, -0.12230613261635881, 0.02449051595788119, -0.01477793106644214, 0.22262893869435485, 0.08134350542544941, 0.14790497821036586, 0.10604411253964977, 0.12002320052714005, 0.13402685762937122, 0.12583552400546172, -0.1139513039165707, -0.15696942026998045, -0.29563273869077616, -0.17049605699986975, -0.24727772050124558, 0.11500985119963371, -0.10313240626069446, -0.08129743321450969, 0.34563837669601166, 0.11508134561089822, 0.12107907925272667, -0.009895924514135982, 0.36952622230105764, 0.1455422883876894, 0.09669167899727067, 0.102793205458718, 0.2815212413927988, 0.19046435712636273, 0.07201419870923215, -0.2595459567913432, 0.15671769925098442, -0.024438410608357268]
|
1,803.05679
|
Nowhere differentiable hairs for entire maps
|
In 1984 Devaney and Krych showed that for the exponential family $\lambda
e^z$, where $0<\lambda <1/e$, the Julia set consists of uncountably many
pairwise disjoint simple curves tending to $\infty$, which they called hairs.
Viana proved that these hairs are smooth. Bara\'nski as well as Rottenfusser,
R\"uckert, Rempe and Schleicher gave analogues of the result of Devaney and
Krych for more general classes of functions. In contrast to Viana's result we
construct in this article an entire function, where the Julia set consists of
hairs, which are nowhere differentiable.
|
math.DS math.CV
|
in 1984 devaney and krych showed that for the exponential family lambda ez where 0lambda 1e the julia set consists of uncountably many pairwise disjoint simple curves tending to infty which they called hairs viana proved that these hairs are smooth baranski as well as rottenfusser ruckert rempe and schleicher gave analogues of the result of devaney and krych for more general classes of functions in contrast to vianas result we construct in this article an entire function where the julia set consists of hairs which are nowhere differentiable
|
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|
[-0.14103219947970375, 0.08736784777208632, -0.06631916829374158, 0.05626853387240834, -0.04003856453145373, -0.1545483294001984, -0.022860976546232044, 0.3068215485191208, -0.2558622905856063, -0.21318453862920575, 0.07711976834160715, -0.32559439719884775, -0.17474949291382713, 0.2390245850272905, -0.13186262903371077, 0.07010145971936912, -0.0036938854161350206, 0.01866054980234168, 0.028654732392169535, -0.2661959284129713, 0.3304071842623211, -0.08972469672303775, 0.1675615118516759, 0.03416697094457802, 0.12881580844050508, -0.011917157976449221, 0.03415356773947333, 0.024154323142492908, -0.17571520142276617, 0.06029940371993051, 0.2802897333649212, 0.16392003329759786, 0.25491053619604004, -0.3265203625410688, -0.1454352421830569, 0.20381567401319056, 0.15042837655664176, -0.026627236709598153, 0.04232115535270931, -0.2668769606549678, 0.09627366302154916, -0.11935211092383526, -0.1967609660357408, -0.10592586711991107, 0.1194790971529638, 0.08959318595756402, -0.25483924445653355, 0.008329255795427438, 0.17759473492450284, 0.059542497347012675, -0.029766671461235177, -0.11004832144639316, -0.05411954664882144, 0.07490209991583364, 0.0396506308481611, 0.10974494633318364, 0.04453971087076198, -0.03637195629838469, -0.09465610993833377, 0.28431293837412996, -0.06126002914903835, -0.18126691764102842, 0.23158465379222842, -0.14159107756491177, -0.19094514370435614, 0.10592644995656507, 0.09642572026571324, 0.13927792816157936, -0.11383310475804169, 0.16778434773213927, -0.13177301951860687, 0.08134253876519272, 0.18506744204238915, 0.010353357432779438, 0.13861901619225397, 0.04296473489710312, 0.09453402399607323, 0.17012544032908847, 0.037870929292777834, -0.06464964190455175, -0.3296604161739521, -0.143009413310712, -0.16599323314710937, 0.08867135802390931, -0.07317036958682302, -0.29384612370464397, 0.36669580574179517, 0.039857768036168195, 0.25070831647421093, 0.15326982774322145, 0.18674753978848457, 0.04278745557396972, 0.005248357937938866, 0.14773178924215977, 0.15976328424702602, 0.0842164347360403, -0.009846056752634802, -0.057564947221578025, 0.015054120939096501, 0.1294640345156364]
|
1,803.0568
|
Resonant Robin problems driven by the $p$-Laplacian plus an indefinite
potential
|
We consider a nonlinear Robin problems driven by the $p$-Laplacian plus an
indefinite potential. The reaction is resonant with respect to a variational
eigenvalue. For the principal eigenvalue we assume strong resonance. Using
variational tools and critical groups we prove existence and multiplicity
theorems.
|
math.AP
|
we consider a nonlinear robin problems driven by the plaplacian plus an indefinite potential the reaction is resonant with respect to a variational eigenvalue for the principal eigenvalue we assume strong resonance using variational tools and critical groups we prove existence and multiplicity theorems
|
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|
[-0.1593163667924025, 0.021547206913303606, -0.07819756538017165, 0.09364820572029037, -0.11383098325776783, -0.16611740228042685, -0.03147467733784155, 0.30838390604846855, -0.30468332195993175, -0.2166132739790059, 0.11727004442152313, -0.3441743507811969, -0.14932926653207027, 0.1431920997248116, -0.03485944932750003, 0.13898015272041614, 0.12673107226675545, 0.08342926564033736, -0.03912080674093555, -0.09575463901273906, 0.46393818814646115, -0.05636855261400342, 0.1683895068497143, 0.09688895832831887, 0.08524658130905167, 0.04939745082943277, 0.04250093440482901, -0.004314674011600966, -0.18205497444564986, 0.12634035614742475, 0.24933713595700366, 0.009955978312063962, 0.37115653312172403, -0.4165175621905787, -0.18969896373296666, 0.19832869413816792, 0.12062942410226572, 0.06735291097059169, -0.04596979082667862, -0.30378630612341856, 0.08975867413259535, -0.08202244637703354, -0.2206117739922113, -0.0769528509276411, -0.06548233052969656, 0.04484784399921244, -0.3578632910820571, 0.14236780050718648, 0.06721276423724537, 0.06840188803405246, -0.14022293765182522, -0.14208742315796288, 0.02958586037857458, -0.00036583347669379276, 0.05434221810587174, -0.05424025506297105, 0.06405322760639881, -0.06911876621994782, -0.16378060603429648, 0.31659650985966437, -0.08865004083649679, -0.2416037753732367, 0.15289095357399096, -0.0674784026447345, -0.1791454820936038, 0.06811108734374019, 0.1711662681773305, 0.16311672681265257, -0.12258455208079382, 0.13782300473857587, 0.008096111991273408, 0.13558125595392828, 0.08804002916440368, -0.08246716622009197, 0.07438450150022452, 0.12620108532295984, 0.17563252851620995, 0.17161804556169294, -0.04725640947634185, -0.10894535744393413, -0.32909818264571106, -0.13327796043383636, -0.17015879699664022, 0.10751303429292007, -0.09537886814359808, -0.2146737138073976, 0.36403367117004976, 0.03203891691836444, 0.16374251839112153, 0.061605865545888344, 0.2397764935158193, 0.24231707397848368, -0.014462309656664729, 0.10837753359440037, 0.2402396907775917, 0.26848351617280225, 0.07047593737529083, -0.24592789560979741, -0.02622822978512638, 0.11237067589536309]
|
1,803.05681
|
Ultrafast Charge Migration in XUV Photoexcited Phenylalanine: a
First-Principles Study Based on Real-Time Nonequilibrium Green's Functions
|
The early stage density oscillations of the electronic charge in molecules
irradiated by an attosecond XUV pulse takes place on femto- or subfemtosecond
timescales. This ultrafast charge migration process is a central topic in
attoscience as it dictates the relaxation pathways of the molecular structure.
A predictive quantum theory of ultrafast charge migration should incorporate
the atomistic details of the molecule, electronic correlations and the
multitude of ionization channels activated by the broad-bandwidth XUV pulse. In
this work we propose a first-principles Non Equilibrium Green's Function method
fulfilling all three requirements, and apply it to a recent experiment on the
photoexcited phenylalanine aminoacid. Our results show that dynamical
correlations are necessary for a quantitative overall agreement with the
experimental data. In particular, we are able to capture the transient
oscillations at frequencies 0.15PHz and 0.30PHz in the hole density of the
amine group, as well as their suppression and the concomitant development of a
new oscillation at frequency 0.25PHz after about 14 femtoseconds.
|
cond-mat.mes-hall physics.atom-ph physics.chem-ph
|
the early stage density oscillations of the electronic charge in molecules irradiated by an attosecond xuv pulse takes place on femto or subfemtosecond timescales this ultrafast charge migration process is a central topic in attoscience as it dictates the relaxation pathways of the molecular structure a predictive quantum theory of ultrafast charge migration should incorporate the atomistic details of the molecule electronic correlations and the multitude of ionization channels activated by the broadbandwidth xuv pulse in this work we propose a firstprinciples non equilibrium greens function method fulfilling all three requirements and apply it to a recent experiment on the photoexcited phenylalanine aminoacid our results show that dynamical correlations are necessary for a quantitative overall agreement with the experimental data in particular we are able to capture the transient oscillations at frequencies 015phz and 030phz in the hole density of the amine group as well as their suppression and the concomitant development of a new oscillation at frequency 025phz after about 14 femtoseconds
|
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|
[-0.11619522778782994, 0.16774423480319456, -0.09085046139662153, 0.0748438034072592, 0.007488911613472737, -0.08184335780861147, 0.07967961648755591, 0.4031733222131152, -0.2486303947487613, -0.2995736437078449, 0.039568374538521314, -0.2810690125654219, -0.11692448107787641, 0.18129749440558954, 0.01642830306373071, 0.044441959750838575, 0.04778823066371842, -0.022359977421001532, -0.0278112001309637, -0.1592287018080242, 0.25976528905739543, 0.09558007454797916, 0.26799320487189104, 0.09726013425679411, 0.07674619404569967, 0.005331287885201164, 0.026565100521838757, -0.07268357419525273, -0.13276647809584574, 0.08842148853000253, 0.26721329147694634, 0.0497977130318759, 0.28113110001286257, -0.514026137732435, -0.24315667460905388, 1.0560992814134807e-05, 0.1369198215423239, 0.1532565292902291, -0.09383926375439841, -0.24152823083568364, 0.02088595209061168, -0.16333347388426772, -0.11017354044597596, -0.07817124781286111, 0.036231326586857904, 0.05981526976808595, -0.24971342117605672, 0.11842272479552776, 0.02085939140215487, 0.04651171885925578, -0.09808318963914645, -0.05313510087435134, -0.03499308407481294, 0.11161895099357935, 0.01033977881215833, 0.03771844540096936, 0.22855661166104255, -0.10412854382302612, -0.11349676680110861, 0.3553907065448584, -0.056789438601845176, -0.07898897378472611, 0.18007789320254233, -0.19291901427495758, -0.12299537758517545, 0.16828441119287163, 0.12097542878968852, 0.1338010973384371, -0.1489959326801909, 0.011296595256135333, 0.023866986753091624, 0.19603368165262508, 0.08334449931280688, 0.09852401921193632, 0.23682559138978831, 0.2244990527848131, 0.03157714990520617, 0.08506541841634316, -0.11824776933935936, -0.0800884337964817, -0.2714745994046098, -0.1096348421589937, -0.16854520934648462, 0.08001779705955414, -0.033958467314005245, -0.11511628420885245, 0.4587019119033357, 0.12962614882853812, 0.17050857599824668, -0.0021538793342188002, 0.2796834828099236, 0.0961662396628526, 0.04762324628682109, 0.004916836938355118, 0.22312862588878488, 0.12869130507315277, 0.12157064954808447, -0.3140273648168659, 0.0803001073829364, -0.008762456820113585]
|
1,803.05682
|
Harmonic functions of random walks in a semigroup via ladder heights
|
We investigate harmonic functions and the convergence of the sequence of
ratios $(P_x(\tau_\vartheta {>} n)/P_e(\tau_\vartheta {>} n))$ for a random
walk on a countable group killed up on the time $\tau_\vartheta$ of the first
exit from some semi-group with an identity element $e$. Several results of
classical renewal theory for one dimensional random walk killed at the first
exit from the positive half-line are extended to a multi-dimensional setting.
For this purpose, an analogue of the ladder height process and the
corresponding renewal function $V$ are introduced. The results are applied to
multidimensional random walks killed upon the times of first exit from a convex
cone. Our approach combines large deviation estimates and an extension of
Choquet-Deny theory.
|
math.PR
|
we investigate harmonic functions and the convergence of the sequence of ratios p_xtau_vartheta np_etau_vartheta n for a random walk on a countable group killed up on the time tau_vartheta of the first exit from some semigroup with an identity element e several results of classical renewal theory for one dimensional random walk killed at the first exit from the positive halfline are extended to a multidimensional setting for this purpose an analogue of the ladder height process and the corresponding renewal function v are introduced the results are applied to multidimensional random walks killed upon the times of first exit from a convex cone our approach combines large deviation estimates and an extension of choquetdeny theory
|
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|
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|
1,803.05683
|
Effective field theory for collective rotations and vibrations of
triaxially deformed nuclei
|
The effective field theory (EFT) for triaxially deformed even-even nuclei is
generalized to include the vibrational degrees of freedom. The pertinent
Hamiltonian is constructed up to next-to-leading order. The leading order part
describes the vibrational motion, and the NLO part couples rotations to
vibrations. The applicability of the EFT Hamiltonian is examined through the
description of the energy spectra of the ground state bands, $\gamma$-bands,
and $K=4$ bands in the $^{108, 110, 112}$Ru isotopes. It is found that by
taking into account the vibrational degrees of freedom, the deviations for
high-spin states in the $\gamma$-band observed in the EFT with only rotational
degrees of freedom disappear. This supports the importance of including
vibrational degrees of freedom in the EFT formulation for the collective motion
of triaxially deformed nuclei.
|
nucl-th
|
the effective field theory eft for triaxially deformed eveneven nuclei is generalized to include the vibrational degrees of freedom the pertinent hamiltonian is constructed up to nexttoleading order the leading order part describes the vibrational motion and the nlo part couples rotations to vibrations the applicability of the eft hamiltonian is examined through the description of the energy spectra of the ground state bands gammabands and k4 bands in the 108 110 112ru isotopes it is found that by taking into account the vibrational degrees of freedom the deviations for highspin states in the gammaband observed in the eft with only rotational degrees of freedom disappear this supports the importance of including vibrational degrees of freedom in the eft formulation for the collective motion of triaxially deformed nuclei
|
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|
[-0.14088388869640767, 0.20971305636885518, -0.0696124243659142, 0.04431204223237728, 0.00022532929142471403, -0.042838827928790124, 0.008962513408732775, 0.29265490075340495, -0.195699660518585, -0.2902753271009715, -0.050002688985841814, -0.3103147023139172, -0.04163205608983844, 0.05272617476293817, 0.03819193279923638, -0.014057554501050618, 0.012711293049505912, 0.038569657219341025, -0.04289542816877656, -0.17353520549113455, 0.24195656207666616, 0.07366480982727808, 0.23116627959097968, 0.04026617379668096, 0.08696374111241312, 0.061769171870764694, 0.07319457103585592, -0.0508263857482234, -0.13237958775636116, 0.12708747258830044, 0.2612744480720721, -0.004975844180989952, 0.1810286744566838, -0.4083799932996044, -0.20424489911238197, 0.0065564431715756655, 0.16249654440616723, 0.19432130634959321, 0.06176412823697319, -0.3120699184437399, -0.018402227033220697, -0.20648822755902074, -0.2468540902591485, -0.19991182478588598, 0.035049752533268475, -0.026576531141472515, -0.2087584336513828, 0.11015805692545655, 0.03709959189109213, 0.08651076466230734, -0.10856594172946643, -0.18134352559718536, -0.10362712142523378, 0.06859716480721545, 0.11028237648133654, -0.002239339330117218, 0.14323527434862626, -0.1121705905879935, -0.07117347418170539, 0.47569610019854736, -0.005346642499716836, -0.17039072825718904, 0.10284019802202238, -0.15373460342016187, -0.14356602916814154, 0.2103341101319529, 0.13234481480685645, 0.13848742861182473, -0.12694590992032317, 0.1450500355776967, 0.06206421050228528, 0.17210076487572223, 0.022601293173238446, 0.10787406031340652, 0.1933056353500433, 0.11272242798258958, -0.011185839561221655, 0.11503560960045434, -0.12525910091790138, -0.18572111286630388, -0.3461873700725846, -0.07760378666353063, -0.16050615465746887, 0.014290611979959067, -0.07245670517636427, -0.07857668971723797, 0.4708697694222792, 0.07962868139657076, 0.12581524369124963, -0.021917480940828682, 0.22515783352719154, 0.09131016643368639, 0.09897293225367321, 0.06145320583436842, 0.35547484916605754, 0.22795687549842114, 0.003160741340252571, -0.3228629087793706, -0.06363941786912619, 0.05264898390396411]
|
1,803.05684
|
Some insights into the behaviour of millimetre wave spectrum on key 5G
cellular KPIs
|
This invited paper discusses the challenging task of assessing the
millmeter-wave spectrum for the use of 5G mobile systems. 3 key KPIs related to
mobile systems, coverage, capacity and mobility are individually assessed and
quantified with a simplistic figure of merit (FoM). The coverage and capacity
KPIs are assessed through simulations while an analytical approach is developed
for mobility. The key message is that the FoM degrades with the higher as the
frequencies increase in this range. This indicates that there will be more
challenges in deploying millimeter wave systems in higher frequencies, but
these are not insurmountable. Many of these challenges are addressed in the
mmMAGIC project and possible solutions are derived.
|
cs.IT math.IT
|
this invited paper discusses the challenging task of assessing the millmeterwave spectrum for the use of 5g mobile systems 3 key kpis related to mobile systems coverage capacity and mobility are individually assessed and quantified with a simplistic figure of merit fom the coverage and capacity kpis are assessed through simulations while an analytical approach is developed for mobility the key message is that the fom degrades with the higher as the frequencies increase in this range this indicates that there will be more challenges in deploying millimeter wave systems in higher frequencies but these are not insurmountable many of these challenges are addressed in the mmmagic project and possible solutions are derived
|
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|
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|
1,803.05685
|
Nonlinear second order evolution inclusions with noncoercive viscosity
term
|
In this paper we deal with a second order nonlinear evolution inclusion, with
a nonmonotone, noncoercive viscosity term. Using a parabolic regularization
(approximation) of the problem and {\it a priori} bounds that permit passing to
the limit, we prove that the problem has a solution.
|
math.AP
|
in this paper we deal with a second order nonlinear evolution inclusion with a nonmonotone noncoercive viscosity term using a parabolic regularization approximation of the problem and it a priori bounds that permit passing to the limit we prove that the problem has a solution
|
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|
[-0.1283257064099113, -0.004853345598611567, -0.1154758818861511, 0.05978960400292029, -0.134180670686894, -0.11927343506572975, 0.04380075873858813, 0.3089442467316985, -0.33235133974812925, -0.2523978844078051, 0.16018989869238187, -0.28657109584245416, -0.1802867335991727, 0.12697226645218002, -0.05524979756317205, 0.10276809413399961, 0.10456961161560482, 0.016829929500818252, -0.10024811163958576, -0.2364469969748623, 0.3579478573467996, -0.02839303198787901, 0.16524122413247824, 0.07233281972714596, 0.16697851084172727, -0.011090571764442655, 0.04062164165079594, 0.1007381587392754, -0.17408731984550185, 0.13072511751929092, 0.23071681931097474, 0.04039034977451795, 0.37427795057495433, -0.39365005240672163, -0.24243068179736535, 0.1448876256744067, 0.12199022401538161, 0.1436669019361337, -0.07145260457052953, -0.2055997995245788, 0.08292417023330927, -0.18520786373151674, -0.16468090758555465, -0.059186283954315716, -0.023960827156487438, 0.015796144927541413, -0.35838405276752183, 0.0872881581592891, 0.11720602479245927, -0.040134319642351736, -0.10775669963202543, -0.021641137078404427, 0.061300422147744234, 0.04110708839984404, 0.07982359776894252, 0.05013582648502456, -0.012429618607792589, -0.12486521052714024, -0.05969133163905806, 0.3718403427137269, -0.132529082079418, -0.31810366314732363, 0.15069852001551126, -0.09542836886313226, -0.140644554545482, 0.1200989403658443, 0.1979902547473709, 0.18016220699581836, -0.1385068125401934, 0.1436569052761317, -0.08664238872006536, 0.18856663140985702, 0.07452161285198397, -0.016289473552670745, 0.07115286630060938, 0.18224373339778846, 0.1872459148367246, 0.15935841887775395, -0.03923872322258022, -0.08418880951487356, -0.33941204018063015, -0.1299628524730603, -0.1326489361623923, 0.057231018712951075, -0.08285378688500107, -0.21800193939513215, 0.3669921970201863, 0.15465492953856785, 0.18404173448992273, 0.13561678578456243, 0.2891065129803287, 0.2358802874883016, -0.0012774515483114455, 0.08782192251011212, 0.25220493411955736, 0.15213477126736608, 0.11792828289067579, -0.2330728996189363, 0.0690102908346388, 0.15227181031886075]
|
1,803.05686
|
Cosmic-rays, gas, and dust in nearby anti-centre clouds : III -- Dust
extinction, emission, and grain properties
|
We have explored the capabilities of dust extinction and $\gamma$ rays to
probe the properties of the interstellar medium in the nearby anti-centre
region. We have jointly modelled the $\gamma$-ray intensity and the stellar
reddening, E(B-V) as a combination of H$_{\rm I}$-bright, CO-bright, and
ionised gas components. The complementary information from dust reddening and
$\gamma$ rays is used to reveal the dark gas not seen, or poorly traced, by
H$_{\rm I}$, free-free, and $^{12}$CO emissions. We compare the total gas
column densities, $N_{\rm{H}}$, derived from the $\gamma$ rays and stellar
reddening with those inferred from a similar analysis (Remy et al. 2017) of
$\gamma$ rays and of the optical depth of the thermal dust emission,
$\tau_{353}$, at 353 GHz. We can therefore compare environmental variations in
specific dust reddening, E(B-V)/$N_{\rm H}$, and in dust emission opacity (dust
optical depth per gas nucleon), $\tau_{353}/N_{\rm{H}}$. Over the whole
anti-centre region, we find an average E(B-V)/$N_{\rm H}$ ratio of
$(2.02\pm0.48)\times$ $10^{-22}$~mag~cm$^2$, with maximum local variations of
about $\pm30\%$ at variance with the two to six fold coincident increase seen
in emission opacity as the gas column density increases. In the diffuse medium,
the small variations in specific reddening, E(B-V)/$N_{\rm H}$ implies a rather
uniform dust-to-gas mass ratio in the diffuse parts of the anti-centre clouds.
The small amplitude of the E(B-V)/$N_{\rm H}$ variations with increasing
$N_{\rm{H}}$ column density confirms that the large opacity
$\tau_{353}/N_{\rm{H}}$ rise seen toward dense CO clouds is primarily due to
changes in dust emissivity. The environmental changes are qualitatively
compatible with model predictions based on mantle accretion on the grains and
the formation of grain aggregates.
|
astro-ph.HE astro-ph.GA
|
we have explored the capabilities of dust extinction and gamma rays to probe the properties of the interstellar medium in the nearby anticentre region we have jointly modelled the gammaray intensity and the stellar reddening ebv as a combination of h_rm ibright cobright and ionised gas components the complementary information from dust reddening and gamma rays is used to reveal the dark gas not seen or poorly traced by h_rm i freefree and 12co emissions we compare the total gas column densities n_rmh derived from the gamma rays and stellar reddening with those inferred from a similar analysis remy et al 2017 of gamma rays and of the optical depth of the thermal dust emission tau_353 at 353 ghz we can therefore compare environmental variations in specific dust reddening ebvn_rm h and in dust emission opacity dust optical depth per gas nucleon tau_353n_rmh over the whole anticentre region we find an average ebvn_rm h ratio of 202pm048times 1022magcm2 with maximum local variations of about pm30 at variance with the two to six fold coincident increase seen in emission opacity as the gas column density increases in the diffuse medium the small variations in specific reddening ebvn_rm h implies a rather uniform dusttogas mass ratio in the diffuse parts of the anticentre clouds the small amplitude of the ebvn_rm h variations with increasing n_rmh column density confirms that the large opacity tau_353n_rmh rise seen toward dense co clouds is primarily due to changes in dust emissivity the environmental changes are qualitatively compatible with model predictions based on mantle accretion on the grains and the formation of grain aggregates
|
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|
[-0.031635643656184285, 0.13458464705463694, -0.023307050863113823, 0.06617279705424431, -0.012143766482623707, -0.03168162018885367, 0.04118599186367924, 0.457782449876136, -0.23831678845542875, -0.3247770932192011, 0.010898840473253877, -0.2971155722696647, 0.018265048571585018, 0.12490799188976467, -0.0406102980151577, -0.025483259871554958, -0.03320380454200483, -0.13712505107649553, -0.009861480322922403, -0.21851498360322047, 0.28590140487458415, 0.12195202586497002, 0.16841905949217842, 0.05490742665639979, 0.05309934741066492, -0.11130406573158867, -0.1330205769534045, -0.005458497748006391, -0.167877681520622, 0.08538498691393583, 0.18355030073421716, 0.07989506810487654, 0.12153950656803311, -0.36173282380265587, -0.2717190001245218, 0.08740078401446337, 0.16538054489073847, 0.008941773805084801, -0.003518710246590457, -0.24412635967263396, -0.023575948330907877, -0.1622200231156703, -0.18908169352136667, 0.11186897249762165, 0.08176265067939881, 0.041620616041050995, -0.23825932310304057, 0.15326553546620944, -0.012448792891018804, 0.10943804629580722, -0.11053534490873909, -0.14724579493280585, -0.10852075052333868, 0.0522374507672516, 0.009973046805741593, 0.07005250447683875, 0.27119879196895613, -0.1550911744160734, 0.045411875151552775, 0.41544364352056484, -0.1427262549427203, -0.004346129478253993, 0.21157759683249333, -0.22271409759987573, -0.1778998165201433, 0.25420460281609236, 0.1527388229133483, 0.057313939563144456, -0.12007199165686558, 0.036460324892381435, -0.04488932004443704, 0.21751777535457278, 0.09026668480071345, 0.06572228402720466, 0.3014469956588142, 0.054360212130784874, 0.04866951919518583, 0.11031429100788788, -0.25471182135804665, -0.005418539552670328, -0.23620051444767626, -0.10122885985099106, -0.13566789940756724, 0.09798358301308854, -0.16927679431333006, -0.11003908212296665, 0.26700856951545243, 0.11325190483091686, 0.2779306401036509, 0.02429839242818474, 0.3285867338644639, 0.0896058649967517, 0.07644308546828177, 0.16926981816032746, 0.29071176759649836, 0.20272576126877845, 0.11888598338727491, -0.24495822819436808, 0.13264071107895348, -0.0016579521937253139]
|
1,803.05687
|
A weighted anisotropic variant of the Caffarelli-Kohn-Nirenberg
inequality and applications
|
We present a weighted version of the Caffarelli-Kohn-Nirenberg inequality in
the framework of variable exponents. The combination of this inequality with a
variant of the fountain theorem, yields the existence of infinitely many
solutions for a class of non-homogeneous problems with Dirichlet boundary
condition.
|
math.AP
|
we present a weighted version of the caffarellikohnnirenberg inequality in the framework of variable exponents the combination of this inequality with a variant of the fountain theorem yields the existence of infinitely many solutions for a class of nonhomogeneous problems with dirichlet boundary condition
|
[['we', 'present', 'a', 'weighted', 'version', 'of', 'the', 'caffarellikohnnirenberg', 'inequality', 'in', 'the', 'framework', 'of', 'variable', 'exponents', 'the', 'combination', 'of', 'this', 'inequality', 'with', 'a', 'variant', 'of', 'the', 'fountain', 'theorem', 'yields', 'the', 'existence', 'of', 'infinitely', 'many', 'solutions', 'for', 'a', 'class', 'of', 'nonhomogeneous', 'problems', 'with', 'dirichlet', 'boundary', 'condition']]
|
[-0.16172834372661204, 0.03310458312361417, -0.1105449875626205, 0.04440620565649376, -0.04982863650233908, -0.15885370996230366, 0.04191606541545215, 0.2509435267870272, -0.3119275810366327, -0.25115839777175675, 0.16524789001083595, -0.24955110184170984, -0.103982229124416, 0.21912489837797527, -0.0814061103684997, 0.10072884691709821, 0.0810624814846299, 0.014412613162262873, -0.07135645978533747, -0.2085186839315363, 0.3814972901547497, -0.06774979651990262, 0.23027741175610572, 0.05866332570175556, 0.09559461567550898, 0.015331433948383412, 0.027263474195602943, 0.02670018990862776, -0.20474113428711213, 0.2139015388569202, 0.2112602350217375, 0.09827022047036073, 0.36323301443322137, -0.34255298250883986, -0.221370943763759, 0.19699002199128948, 0.06046025797894055, 0.058356926014477555, -0.0638809750195254, -0.27094917551783676, 0.07387934013439174, -0.12074823067946867, -0.25280901531434874, -0.003816756573294035, -0.06372886679177596, 0.09215477551598186, -0.3580607512796467, 0.17608979035338218, 0.1413233518304134, 0.03964769192547961, -0.17964930155060507, -0.06386315086009828, 0.08525113338096575, -0.017617183494042944, 0.05175499776801602, -0.0069363265700468964, 0.002131274784915149, -0.11022855717667633, -0.1474784522063353, 0.3214072636751966, -0.08873684327541427, -0.26914942378855566, 0.12086571189998226, -0.0889055087146434, -0.21492969562214884, 0.051588600808331234, 0.14171037438791245, 0.17833813559263945, -0.12611751766367393, 0.13268113759642636, -0.15885894425710748, 0.1090839435769753, 0.10595445267178795, 0.03615211854180829, 0.07761674067428843, 0.11853717632634057, 0.18084173086390365, 0.24723998355594548, -0.0453736559773626, -0.12920162420381198, -0.40283677339638496, -0.1886580833128061, -0.1402647535168481, 0.0740472562611103, -0.17821717847519639, -0.2607946108857339, 0.34619620929218153, 0.05315405955876817, 0.15742294868951748, 0.12031142373399978, 0.16955457022413611, 0.1435026899403469, 0.022022462682798505, 0.06754383324137465, 0.1554876836969263, 0.21199065692384134, 0.14979640529914337, -0.13733406449583443, 0.057214473829266026, 0.22833975194953382]
|
1,803.05688
|
Effects of stoichiometry on premixed flames propagating in narrow
channels: symmetry-breaking bifurcations
|
Recent studies within the diffusive-thermal (constant-density) approximation
have shown that, for premixed flames freely propagating in narrow adiabatic
channels, the instabilities induced by differential diffusion may result in
non-symmetric solutions and/or oscillating and rotating propagation modes. This
has been shown in the context of lean mixtures, for which a single species
transport equation with a single Lewis number (corresponding to the ratio of
thermal to molecular diffusivity of the deficient reactant) can be used to
describe the flame propagation problem. In the present work we extend the
analysis to mixtures of any equivalence ratio. To this end, we consider a
two-reactant model, where the different diffusivities of the two reactants
introduce two different Lewis numbers. Steady-state computations and linear
stability analysis are carried out for mixtures with large disparity between
the Lewis number of the fuel (LeF) and the oxidizer (LeO), such as
hydrogen-oxygen systems. It is shown that both differential diffusion and
preferential diffusion have influence on the stability of the symmetric flame
shape. For sufficiently lean and rich mixtures, the flame behaves as dictated
by the Lewis number of the deficient reactant, i.e., the flame destabilizes
toward non-symmetric solutions for large mass flow rates when the mentioned
Lewis number is less than one. In near-stoichiometric mixtures the stability of
the symmetric flame depends on a weighted average value of LeF and LeO. In
particular, the symmetric solution is stable for large mass flow rates because
of the difficulties found by the less diffusive reactant to reach the reactive
zone of the flame.
|
physics.flu-dyn
|
recent studies within the diffusivethermal constantdensity approximation have shown that for premixed flames freely propagating in narrow adiabatic channels the instabilities induced by differential diffusion may result in nonsymmetric solutions andor oscillating and rotating propagation modes this has been shown in the context of lean mixtures for which a single species transport equation with a single lewis number corresponding to the ratio of thermal to molecular diffusivity of the deficient reactant can be used to describe the flame propagation problem in the present work we extend the analysis to mixtures of any equivalence ratio to this end we consider a tworeactant model where the different diffusivities of the two reactants introduce two different lewis numbers steadystate computations and linear stability analysis are carried out for mixtures with large disparity between the lewis number of the fuel lef and the oxidizer leo such as hydrogenoxygen systems it is shown that both differential diffusion and preferential diffusion have influence on the stability of the symmetric flame shape for sufficiently lean and rich mixtures the flame behaves as dictated by the lewis number of the deficient reactant ie the flame destabilizes toward nonsymmetric solutions for large mass flow rates when the mentioned lewis number is less than one in nearstoichiometric mixtures the stability of the symmetric flame depends on a weighted average value of lef and leo in particular the symmetric solution is stable for large mass flow rates because of the difficulties found by the less diffusive reactant to reach the reactive zone of the flame
|
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|
[-0.10277820377202246, 0.17416312008318197, -0.0403866385856259, 0.008821921694251368, -0.006946467968176991, -0.12373997743744107, 0.016280425460233044, 0.31726123040748966, -0.2646495743325749, -0.2614208555277733, 0.09276304344022056, -0.24918047745623403, -0.07517587549481837, 0.1771679467748895, -0.03381262930333688, 0.057407111749939975, 0.05597222914608816, -0.00017200449910310527, -0.029478908890196758, -0.19541731575367202, 0.30648809220154016, 0.06933414736404157, 0.29828489986654844, 0.03254753336705829, 0.08454550999043037, -0.059271137219011075, -0.008217871999405029, 0.025610601965574516, -0.16022358902866096, 0.05325973671648489, 0.22943065130329204, 0.06774930239817689, 0.2567339536982463, -0.4228951770087911, -0.23950157323039123, 0.09825926168733054, 0.17572884819108164, 0.1140547642407621, -0.058125367854714456, -0.21701795625359943, 0.05103562086994302, -0.17163963899079207, -0.15152309582446746, -0.040907059250111205, 0.07346760519107597, 0.08239585576423754, -0.2613808301477028, 0.1075855690195033, 0.06864648158865286, 0.046291302405445586, -0.05804192567140692, -0.12631739564018235, -0.06246405048665428, 0.08865864396555856, 0.07790755304700897, -0.04786269307240016, 0.14322270715742239, -0.13636470898742148, 0.010773967585659452, 0.40546620707397185, -0.0944230231470433, -0.22783479396815573, 0.23867675236570426, -0.14272191372421933, -0.08801872245200525, 0.16478423035698056, 0.16953034619181712, 0.170460111069833, -0.12120173265354843, 0.02752799058512282, -0.057270519272793856, 0.13137638270494617, 0.12990409989438448, -0.04722733475038752, 0.15370156996077783, 0.18469103950534074, 0.04929571397905608, 0.1372502689163888, -0.09074577052582292, -0.14727399361482452, -0.2130954742490772, -0.17863377561286417, -0.1299615086218904, 0.03137578039304427, -0.09401100197687305, -0.17564767005768817, 0.3331672068988343, 0.09182373934036439, 0.19936682020003596, 0.023096894674901187, 0.2635991328265629, 0.1075655738418896, 0.03194314072422299, 0.08571257610576198, 0.25451462976320366, 0.18829695273390307, 0.11565397079989669, -0.2571601762587855, 0.12241483739339784, 0.06492989280516104]
|
1,803.05689
|
Using StackOverflow content to assist in code review
|
An important goal for programmers is to minimize cost of identifying and
correcting defects in source code. Code review is commonly used for identifying
programming defects. However, manual code review has some shortcomings: a) it
is time consuming, b) outcomes are subjective and depend on the skills of
reviewers. An automated approach for assisting in code reviews is thus highly
desirable. We present a tool for assisting in code review and results from our
experiments evaluating the tool in different scenarios. The tool leveraged
content available from professional programmer support forums (e.g.
StackOverflow.com) to determine potential defectiveness of a given piece of
source code. The defectiveness is expressed on the scale of {Likely defective,
Neutral, Unlikely to be defective}. Basic idea employed in the tool is to: a)
Identify a set P of discussion posts on StackOverflow such that each p in P
contains source code fragment(s) which sufficiently resemble the input code C
being reviewed. b) Determine the likelihood of C being defective by considering
all p in P . A novel aspect of our approach is to use document fingerprinting
for comparing two pieces of source code. Our choice of document fingerprinting
technique is inspired by source code plagiarism detection tools where it has
proven to be very successful. In the experiments that we performed to verify
effectiveness of our approach source code samples from more than 300 GitHub
open source repositories were taken as input. A precision of more than 90% in
identifying correct/relevant results has been achieved.
|
cs.SE cs.ET
|
an important goal for programmers is to minimize cost of identifying and correcting defects in source code code review is commonly used for identifying programming defects however manual code review has some shortcomings a it is time consuming b outcomes are subjective and depend on the skills of reviewers an automated approach for assisting in code reviews is thus highly desirable we present a tool for assisting in code review and results from our experiments evaluating the tool in different scenarios the tool leveraged content available from professional programmer support forums eg stackoverflowcom to determine potential defectiveness of a given piece of source code the defectiveness is expressed on the scale of likely defective neutral unlikely to be defective basic idea employed in the tool is to a identify a set p of discussion posts on stackoverflow such that each p in p contains source code fragments which sufficiently resemble the input code c being reviewed b determine the likelihood of c being defective by considering all p in p a novel aspect of our approach is to use document fingerprinting for comparing two pieces of source code our choice of document fingerprinting technique is inspired by source code plagiarism detection tools where it has proven to be very successful in the experiments that we performed to verify effectiveness of our approach source code samples from more than 300 github open source repositories were taken as input a precision of more than 90 in identifying correctrelevant results has been achieved
|
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|
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|
1,803.0569
|
Optimal liquidity-based trading tactics
|
We consider an agent who needs to buy (or sell) a relatively small amount of
asset over some fixed short time interval. We work at the highest frequency
meaning that we wish to find the optimal tactic to execute our quantity using
limit orders, market orders and cancellations. To solve the agent's control
problem, we build an order book model and optimize an expected utility function
based on our price impact. We derive the equations satisfied by the optimal
strategy and solve them numerically. Moreover, we show that our optimal tactic
enables us to outperform significantly naive execution strategies.
|
q-fin.TR
|
we consider an agent who needs to buy or sell a relatively small amount of asset over some fixed short time interval we work at the highest frequency meaning that we wish to find the optimal tactic to execute our quantity using limit orders market orders and cancellations to solve the agents control problem we build an order book model and optimize an expected utility function based on our price impact we derive the equations satisfied by the optimal strategy and solve them numerically moreover we show that our optimal tactic enables us to outperform significantly naive execution strategies
|
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|
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|
1,803.05691
|
Stellarator impurity flux driven by electric fields tangent to magnetic
surfaces
|
The control of impurity accumulation is one of the main challenges for future
stellarator fusion reactors. The standard argument to explain this accumulation
relies on the, in principle, large inward pinch in the neoclassical impurity
flux caused by the typically negative radial electric field in stellarators.
This simplified interpretation was proven to be flawed by Helander et al.
[Phys. Rev. Lett. 118, 155002 (2017)], who showed that in a relevant regime
(low-collisionality main ions and collisional impurities) the radial electric
field does not drive impurity transport. In that reference, the effect of the
component of the electric field that is tangent to the magnetic surface was not
included. In this Letter, an analytical calculation of the neoclassical radial
impurity flux incorporating such effect is given, showing that it can be very
strong for highly charged impurities and that, once it is taken into account,
the dependence of the impurity flux on the radial electric field reappears.
Realistic examples are provided in which the inclusion of the tangential
electric field leads to impurity expulsion.
|
physics.plasm-ph
|
the control of impurity accumulation is one of the main challenges for future stellarator fusion reactors the standard argument to explain this accumulation relies on the in principle large inward pinch in the neoclassical impurity flux caused by the typically negative radial electric field in stellarators this simplified interpretation was proven to be flawed by helander et al phys rev lett 118 155002 2017 who showed that in a relevant regime lowcollisionality main ions and collisional impurities the radial electric field does not drive impurity transport in that reference the effect of the component of the electric field that is tangent to the magnetic surface was not included in this letter an analytical calculation of the neoclassical radial impurity flux incorporating such effect is given showing that it can be very strong for highly charged impurities and that once it is taken into account the dependence of the impurity flux on the radial electric field reappears realistic examples are provided in which the inclusion of the tangential electric field leads to impurity expulsion
|
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|
[-0.10758383478021769, 0.1691425353956854, -0.04645253848934243, 0.04302202860979082, -0.07001091874892239, -0.10073010383314605, 0.008784391614743833, 0.3361204748182709, -0.20181746799823677, -0.3117993489411378, 0.0012197448299428838, -0.25286744644074854, -0.09194964926343324, 0.2014101886239206, -0.08186418424241332, -0.012525500473837086, 0.03196054534969017, -0.029148302701583435, 0.005799009872134775, -0.24212464985713839, 0.26724822284263927, 0.10234547238038896, 0.2982263237855202, 0.14196068925653085, 0.026035217066744862, 0.03229188917713716, 0.008881673633749055, 0.085605179067961, -0.08902315996343786, 0.036928883753716946, 0.18873576010945578, 0.0023989716089915397, 0.2520605159414456, -0.488089079535458, -0.2238855250288061, 0.03979276530011449, 0.14567109586151186, 0.17606615030333986, -0.0796648226935568, -0.27673037092981123, 0.04343613045767957, -0.15835065227326786, -0.1553286656183678, -0.06000924097958866, 0.08716926195585645, 0.03739614742483164, -0.3215322697989989, 0.12115831578524004, 0.0940579490703639, 0.06485401736816045, -0.08763841718305336, -0.10467928399732553, -0.05408810539344369, 0.0358724195705077, 0.10075337461231082, 0.08664394707722199, 0.20975464590971338, -0.08985892360282759, -0.04982907115075694, 0.3310426811140767, -0.06288008211548765, -0.1718569947785676, 0.1606462361984128, -0.18777536499573913, -0.07645718755909826, 0.1593185702317156, 0.13213312699930568, 0.09821914817710126, -0.17125700929437002, 0.09966386590886667, -0.039611348338143594, 0.11205491433353272, 0.054884739009647215, -0.042577848147037765, 0.25714549553569754, 0.10670600712859765, 0.04076863823967531, 0.07547581502978234, -0.14155774372548602, -0.08402678561241225, -0.302864417745082, -0.1615953340931514, -0.1946683577478452, 0.06913412971097874, 0.0005726870259359414, -0.18316891001602417, 0.36661119461005426, 0.1964251637935292, 0.15430039560373568, -0.10557678733819684, 0.27298467025041667, 0.16361867097412172, 0.07394289877671792, 0.11873268479004849, 0.31583090901353156, 0.1862143341311102, 0.13342331596555426, -0.3059994055629643, 0.04788414664772274, 0.04766927238830079]
|
1,803.05692
|
Pointwise ergodic theorems for some thin subsets of primes
|
We establish pointwise ergodic theorems for operators of Radon type along
subsets of prime numbers of the form $\big\{\{ \varphi_1(n)\} < \psi(n)\big\}$.
We achieve this by proving $\ell^p(\mathbb{Z})$ boundedness of $r$-variations,
where $p > 1$ and $r > 2$.
|
math.CA math.DS
|
we establish pointwise ergodic theorems for operators of radon type along subsets of prime numbers of the form big varphi_1n psinbig we achieve this by proving ellpmathbbz boundedness of rvariations where p 1 and r 2
|
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|
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|
1,803.05693
|
Anharmonic phonon effects on linear thermal expansion of trigonal
bismuth selenide and antimony telluride crystals
|
We adopted and extended an efficient Gr\"uneisen formalism to study the
phonon anharmonicity and linear thermal expansion coefficients (TECs) of
trigonal bismuth selenide (Bi$_2$Se$_3$) and antimony telluride (Sb$_2$Te$_3$).
Anharmonicity of the systems is studied via extensive calculation of
Gr\"uneisen parameters that exploit symmetry-preserving deformations.
Consistent with experimental findings, a large anisotropy between the TECs in
the $a$ and $c$ directions is found. The larger anharmonicity inherent in
Sb$_2$Te$_3$, as compared to Bi$_2$Se$_3$ is offset by the volumetric effect,
resulting in comparable temperature dependence of their linear TECs. The Debye
temperatures deduced from our first-principles data also agree very well with
the existing tabulated values. The highly efficient methodology developed in
this work, applied for the first time to study the linear TECs of two trigonal
thermoelectric systems, opens up exciting opportunities to address the
anharmonic effects in other thermoelectrics and other low-symmetry materials.
|
cond-mat.mtrl-sci physics.comp-ph
|
we adopted and extended an efficient gruneisen formalism to study the phonon anharmonicity and linear thermal expansion coefficients tecs of trigonal bismuth selenide bi_2se_3 and antimony telluride sb_2te_3 anharmonicity of the systems is studied via extensive calculation of gruneisen parameters that exploit symmetrypreserving deformations consistent with experimental findings a large anisotropy between the tecs in the a and c directions is found the larger anharmonicity inherent in sb_2te_3 as compared to bi_2se_3 is offset by the volumetric effect resulting in comparable temperature dependence of their linear tecs the debye temperatures deduced from our firstprinciples data also agree very well with the existing tabulated values the highly efficient methodology developed in this work applied for the first time to study the linear tecs of two trigonal thermoelectric systems opens up exciting opportunities to address the anharmonic effects in other thermoelectrics and other lowsymmetry materials
|
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|
[-0.1294556536395884, 0.15440618391468278, -0.027194383775593935, 0.009676096158206358, -0.08131893479975162, -0.1499154322513646, 0.06650112746478794, 0.39664328968399887, -0.2862205567079355, -0.27508485701807833, 0.003818602853949618, -0.33269644249881897, -0.14735042659152248, 0.258828446047602, 0.04686938575957413, 0.0747405159494952, -0.005944762561287913, -0.09410708287683596, -0.1324908533182412, -0.21989668147814284, 0.23484752628743857, 0.09670857395130125, 0.3404261944164242, 0.08723302171207391, 0.024284816823307086, -0.026263137585711437, 0.04854554006947087, 0.058287212312534135, -0.187737146706959, 0.12251328688336315, 0.2963817142181333, -0.12986925907980104, 0.19741574330971792, -0.41623917640141256, -0.2339820556824545, -0.021858983076832067, 0.10190457265198856, 0.1506164431558935, -0.06597510078544175, -0.21648001883152898, 0.028055512165598623, -0.1541484147538203, -0.12448000101213037, -0.1606719485871572, 0.004399248570614084, -0.012119693353925213, -0.2184022437207974, 0.11651496420320534, 0.01329902654849123, 0.0935026805496195, -0.1235035751601095, -0.18799521517166476, -0.07419970715288203, 0.025022238362710794, 0.07565100843223606, 0.017264232469292786, 0.14112553989084867, -0.05498993988279123, -0.10158889111574296, 0.44748404275599896, -0.08598829949131379, -0.09991027612460555, 0.14668494902577225, -0.15470743825711258, -0.10850241614694518, 0.15670512801596334, 0.12032241084233539, 0.10621423529252619, -0.1462249384535203, 0.09437857157106257, 0.05707465199866801, 0.15827267322122687, 0.025738415015223143, 0.0744415352029817, 0.1731155640543341, 0.16365941520617505, -0.02128447784384439, 0.17320678399800862, -0.07195511710393679, -0.001600766178363791, -0.2067114858777373, -0.15528494609954666, -0.2064304522896459, 0.027799008993783614, -0.1248072212120523, -0.18694576662737172, 0.3868117755200792, 0.1610956289203043, 0.1725959928667212, -0.025334584197824025, 0.2674339680958513, 0.08030722974441372, 0.09294999904940361, 0.010662292039113027, 0.27581433287056056, 0.18187160060050656, 0.11229337314860179, -0.3381613372707857, 0.07571893265483888, -0.01494105861659025]
|
1,803.05694
|
On the fractional Schr\"{o}dinger-Kirchhoff equations with
electromagnetic fields and critical nonlinearity
|
We consider the fractional Schr\"{o}dinger-Kirchhoff equations with
electromagnetic fields and critical nonlinearity
$\varepsilon^{2s}M([u]_{s,A_\varepsilon}^2)(-\Delta)_{A_\varepsilon}^su + V(x)u
=$ $|u|^{2_s^\ast-2}u + h(x,|u|^2)u,$ $\ \ x\in \mathbb{R}^N,$ where $ u(x)
\rightarrow 0$ as $|x| \rightarrow \infty,$ and $(-\Delta)_{A_\varepsilon}^s$
is the fractional magnetic operator with $0<s<1$, $2_s^\ast = 2N/(N-2s),$ $M :
\mathbb{R}^{+}_{0} \rightarrow \mathbb{R}^{+}$ is a continuous nondecreasing
function, $V:\mathbb{R}^N \rightarrow \mathbb{R}^+_0,$ and $A: \mathbb{R}^N
\rightarrow \mathbb{R}^N$ are the electric and the magnetic potential,
respectively. By using the fractional version of the concentration compactness
principle and variational methods, we show that the above problem: (i) has at
least one solution provided that $\varepsilon < \mathcal {E}$; and (ii) for any
$m^\ast \in \mathbb{N}$, has $m^\ast$ pairs of solutions if $\varepsilon <
\mathcal {E}_{m^\ast}$, where $\mathcal {E}$ and $\mathcal {E}_{m^\ast}$ are
sufficiently small positive numbers. Moreover, these solutions $u_\varepsilon
\rightarrow 0$ as $\varepsilon \rightarrow 0$.
|
math.AP
|
we consider the fractional schrodingerkirchhoff equations with electromagnetic fields and critical nonlinearity varepsilon2smu_sa_varepsilon2delta_a_varepsilonsu vxu u2_sast2u hxu2u xin mathbbrn where ux rightarrow 0 as x rightarrow infty and delta_a_varepsilons is the fractional magnetic operator with 0s1 2_sast 2nn2s m mathbbr_0 rightarrow mathbbr is a continuous nondecreasing function vmathbbrn rightarrow mathbbr_0 and a mathbbrn rightarrow mathbbrn are the electric and the magnetic potential respectively by using the fractional version of the concentration compactness principle and variational methods we show that the above problem i has at least one solution provided that varepsilon mathcal e and ii for any mast in mathbbn has mast pairs of solutions if varepsilon mathcal e_mast where mathcal e and mathcal e_mast are sufficiently small positive numbers moreover these solutions u_varepsilon rightarrow 0 as varepsilon rightarrow 0
|
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|
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|
1,803.05695
|
Role of neutrino mixing in accelerated proton decay
|
The inverse beta decay of accelerated protons has been analyzed both in the
laboratory frame (where the proton is accelerated) and in the comoving frame
(where the proton is at rest and interacts with the Fulling-Davies-Unruh
thermal bath of electrons and neutrinos). The equality between the two rates
has been exhibited as an evidence of the necessity of Fulling-Davies-Unruh
effect for the consistency of Quantum Field Theory formalism. Recently, it has
been argued that neutrino mixing can spoil such a result, potentially opening
new scenarios in neutrino physics. In the present paper, we analyze in detail
this problem and we find that, assuming flavor neutrinos to be fundamental and
working within a certain approximation, the agreement can be restored.
|
hep-ph hep-th
|
the inverse beta decay of accelerated protons has been analyzed both in the laboratory frame where the proton is accelerated and in the comoving frame where the proton is at rest and interacts with the fullingdaviesunruh thermal bath of electrons and neutrinos the equality between the two rates has been exhibited as an evidence of the necessity of fullingdaviesunruh effect for the consistency of quantum field theory formalism recently it has been argued that neutrino mixing can spoil such a result potentially opening new scenarios in neutrino physics in the present paper we analyze in detail this problem and we find that assuming flavor neutrinos to be fundamental and working within a certain approximation the agreement can be restored
|
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|
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|
1,803.05696
|
Higgs boson measurements and extended scalar sector searches in
fermionic final states
|
Since the discovery of the Higgs boson in the year 2012, the CMS experiment
continuously makes use of a variety of final states to measure the properties
of the Higgs boson, as well as to search for it in final states where the
discovery could not yet be established. This article concentrates on Higgs
searches in fermionic final states including a search for the Standard Model
Higgs boson in the $H \rightarrow b\overline{b}$ channel. Furthermore, three
different searches for Higgs bosons beyond the Standard Model are presented.
These comprise two searches for heavy neutral Higgs bosons and one search for a
heavy charged Higgs boson, all of them exploiting final states with tau
leptons.
|
hep-ex hep-ph
|
since the discovery of the higgs boson in the year 2012 the cms experiment continuously makes use of a variety of final states to measure the properties of the higgs boson as well as to search for it in final states where the discovery could not yet be established this article concentrates on higgs searches in fermionic final states including a search for the standard model higgs boson in the h rightarrow boverlineb channel furthermore three different searches for higgs bosons beyond the standard model are presented these comprise two searches for heavy neutral higgs bosons and one search for a heavy charged higgs boson all of them exploiting final states with tau leptons
|
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|
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|
1,803.05697
|
FRB microstructure revealed by the real-time detection of FRB170827
|
We report a new Fast Radio Burst (FRB) discovered in real-time as part of the
UTMOST project at the Molonglo Observatory Synthesis Radio Telescope (MOST).
FRB170827 is the first detected with our low-latency ($< 24$ s),
machine-learning-based FRB detection system. The FRB discovery was accompanied
by the capture of voltage data at the native time and frequency resolution of
the observing system, enabling coherent dedispersion and detailed off-line
analysis, which have unveiled fine temporal and frequency structure. The
dispersion measure (DM) of 176.80 $\pm$ 0.04 pc cm$^{-3}$, is the lowest of the
FRB population. The Milky Way contribution along the line of sight is $\sim$ 40
pc cm$^{-3}$, leaving an excess DM of $\sim$ 145 pc cm$^{-3}$. The FRB has a
fluence $>$ 20 $\pm$ 7 Jy ms, and is narrow, with a width of $\sim$ 400 $\mu$s
at 10$\%$ of its maximum amplitude. However, the burst shows three temporal
components, the narrowest of which is $\sim$ 30 $\mu$s, and a scattering
timescale of $4.1 \pm 2.7$ $\mu$s. The FRB shows spectral modulations on
frequency scales of 1.5 MHz and 0.1 MHz. Both are prominent in the dynamic
spectrum, which shows a very bright region of emission between 841 and 843 MHz,
and weaker, patchy emission across the entire band. We show the fine spectral
structure could arise in the FRB host galaxy, or its immediate vicinity.
|
astro-ph.HE
|
we report a new fast radio burst frb discovered in realtime as part of the utmost project at the molonglo observatory synthesis radio telescope most frb170827 is the first detected with our lowlatency 24 s machinelearningbased frb detection system the frb discovery was accompanied by the capture of voltage data at the native time and frequency resolution of the observing system enabling coherent dedispersion and detailed offline analysis which have unveiled fine temporal and frequency structure the dispersion measure dm of 17680 pm 004 pc cm3 is the lowest of the frb population the milky way contribution along the line of sight is sim 40 pc cm3 leaving an excess dm of sim 145 pc cm3 the frb has a fluence 20 pm 7 jy ms and is narrow with a width of sim 400 mus at 10 of its maximum amplitude however the burst shows three temporal components the narrowest of which is sim 30 mus and a scattering timescale of 41 pm 27 mus the frb shows spectral modulations on frequency scales of 15 mhz and 01 mhz both are prominent in the dynamic spectrum which shows a very bright region of emission between 841 and 843 mhz and weaker patchy emission across the entire band we show the fine spectral structure could arise in the frb host galaxy or its immediate vicinity
|
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|
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|
1,803.05698
|
Nonassociative cyclic extensions of fields and central simple algebras
|
We define nonassociative cyclic extensions of degree m of both fields and
central simple algebras over fields. If a suitable field contains a primitive
mth (resp., qth) root of unity, we show that suitable nonassociative
generalized cyclic division algebras yield nonassociative cyclic extensions of
degree m (resp., qs). Some of Amitsur's classical results on non-commutative
associative cyclic extensions of both fields and central simple algebras are
obtained as special cases.
|
math.RA
|
we define nonassociative cyclic extensions of degree m of both fields and central simple algebras over fields if a suitable field contains a primitive mth resp qth root of unity we show that suitable nonassociative generalized cyclic division algebras yield nonassociative cyclic extensions of degree m resp qs some of amitsurs classical results on noncommutative associative cyclic extensions of both fields and central simple algebras are obtained as special cases
|
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|
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|
1,803.05699
|
Probing the energy spectrum of hadrons in proton air interactions at
ultrahigh energies through the fluctuations of the muon content of extensive
air showers
|
We demonstrate that the shower-to-shower fluctuations of the muon content of
extensive air showers correlate with the fluctuations of a variable of the
first interaction of Ultra High Energy Cosmic Rays, which is computed from the
fraction of energy carried by the hadrons that sustain the hadronic cascade.
The influence of subsequent stages of the shower development is found to play a
sub-dominant role. As a consequence, the shower-to-shower distribution of the
muon content is a direct probe of the hadron energy spectrum of interactions
beyond 100 TeV center of mass energies.
|
hep-ph astro-ph.HE
|
we demonstrate that the showertoshower fluctuations of the muon content of extensive air showers correlate with the fluctuations of a variable of the first interaction of ultra high energy cosmic rays which is computed from the fraction of energy carried by the hadrons that sustain the hadronic cascade the influence of subsequent stages of the shower development is found to play a subdominant role as a consequence the showertoshower distribution of the muon content is a direct probe of the hadron energy spectrum of interactions beyond 100 tev center of mass energies
|
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|
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|
1,803.057
|
Low Temperature Ageing Behaviour of U-Nb $\gamma^{o}$ Phase Alloys
|
Ageing mechanisms of the U-7\%wtNb alloy have been investigated on samples
exposed to temperatures of 150$^{o}$C for up to 5000\,hours. A variety of
surface and bulk analytic techniques have been used to investigate
microstructural, chemical and crystallographic changes. Characterisation of the
alloy's evolving behaviour was carried out through secondary electron
microscopy, energy dispersive x-ray spectroscopy, electron backscatter
diffraction, transmission electron microscopy and x-ray diffraction. Vickers
hardness testing showed evidence of a strong thermal hardening relationship
with ageing. The mechanism responsible for these changes is thought to be a
stress-induced isothermal martensitic transformation; a displacive reaction, in
which correlated shuffling of atoms creates a phase change from $\gamma^{o}$ to
$\alpha''$ without chemical species redistribution.
|
cond-mat.mtrl-sci
|
ageing mechanisms of the u7wtnb alloy have been investigated on samples exposed to temperatures of 150oc for up to 5000hours a variety of surface and bulk analytic techniques have been used to investigate microstructural chemical and crystallographic changes characterisation of the alloys evolving behaviour was carried out through secondary electron microscopy energy dispersive xray spectroscopy electron backscatter diffraction transmission electron microscopy and xray diffraction vickers hardness testing showed evidence of a strong thermal hardening relationship with ageing the mechanism responsible for these changes is thought to be a stressinduced isothermal martensitic transformation a displacive reaction in which correlated shuffling of atoms creates a phase change from gammao to alpha without chemical species redistribution
|
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|
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|
1,803.05701
|
The $^{7}$Be(n,p)$^{7}$Li reaction and the Cosmological Lithium Problem:
measurement of the cross section in a wide energy range at n_TOF (CERN)
|
We report on the measurement of the $^{7}$Be($n, p$)$^{7}$Li cross section
from thermal to approximately 325 keV neutron energy, performed in the
high-flux experimental area (EAR2) of the n_TOF facility at CERN. This reaction
plays a key role in the lithium yield of the Big Bang Nucleosynthesis (BBN) for
standard cosmology. The only two previous time-of-flight measurements performed
on this reaction did not cover the energy window of interest for BBN, and
showed a large discrepancy between each other. The measurement was performed
with a Si-telescope, and a high-purity sample produced by implantation of a
$^{7}$Be ion beam at the ISOLDE facility at CERN. While a significantly higher
cross section is found at low-energy, relative to current evaluations, in the
region of BBN interest the present results are consistent with the values
inferred from the time-reversal $^{7}$Li($p, n$)$^{7}$Be reaction, thus
yielding only a relatively minor improvement on the so-called Cosmological
Lithium Problem (CLiP). The relevance of these results on the near-threshold
neutron production in the p+$^{7}$Li reaction is also discussed.
|
nucl-ex astro-ph.CO
|
we report on the measurement of the 7ben p7li cross section from thermal to approximately 325 kev neutron energy performed in the highflux experimental area ear2 of the n_tof facility at cern this reaction plays a key role in the lithium yield of the big bang nucleosynthesis bbn for standard cosmology the only two previous timeofflight measurements performed on this reaction did not cover the energy window of interest for bbn and showed a large discrepancy between each other the measurement was performed with a sitelescope and a highpurity sample produced by implantation of a 7be ion beam at the isolde facility at cern while a significantly higher cross section is found at lowenergy relative to current evaluations in the region of bbn interest the present results are consistent with the values inferred from the timereversal 7lip n7be reaction thus yielding only a relatively minor improvement on the socalled cosmological lithium problem clip the relevance of these results on the nearthreshold neutron production in the p7li reaction is also discussed
|
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|
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|
1,803.05702
|
Achieving Spatial Scalability for Coded Caching over Wireless Networks
|
The coded caching scheme proposed by Maddah-Ali and Niesen considers the
delivery of files in a given content library to users through a deterministic
error-free network where a common multicast message is sent to all users at a
fixed rate, independent of the number of users. In order to apply this paradigm
to a wireless network, it is important to make sure that the common multicast
rate does not vanish as the number of users increases. This paper focuses on a
variant of coded caching successively proposed for the so-called combination
network, where the multicast message is further encoded by a Maximum Distance
Separable (MDS) code and the MDS-coded blocks are simultaneously transmitted
from different Edge Nodes (ENs) (e.g., base stations or access points). Each
user is equipped with multiple antennas and can select to decode a desired
number of EN transmissions, while either nulling of treating as noise the
others, depending on their strength. The system is reminiscent of the so-called
evolved Multimedia Broadcast Multicast Service (eMBMS), in the sense that the
fundamental underlying transmission mechanism is multipoint multicasting, where
each user can independently and individually (in a user-centric manner) decide
which EN to decode, without any explicit association of users to ENs. We study
the performance of the proposed system when users and ENs are distributed
according to homogeneous Poisson Point Processes in the plane and the
propagation is affected by Rayleigh fading and distance dependent pathloss. Our
analysis allows the system optimization with respect to the MDS coding rate.
Also, we show that the proposed system is fully scalable, in the sense that it
can support an arbitrarily large number of users, while maintaining a
non-vanishing per-user delivery rate.
|
cs.IT cs.SY eess.SY math.IT
|
the coded caching scheme proposed by maddahali and niesen considers the delivery of files in a given content library to users through a deterministic errorfree network where a common multicast message is sent to all users at a fixed rate independent of the number of users in order to apply this paradigm to a wireless network it is important to make sure that the common multicast rate does not vanish as the number of users increases this paper focuses on a variant of coded caching successively proposed for the socalled combination network where the multicast message is further encoded by a maximum distance separable mds code and the mdscoded blocks are simultaneously transmitted from different edge nodes ens eg base stations or access points each user is equipped with multiple antennas and can select to decode a desired number of en transmissions while either nulling of treating as noise the others depending on their strength the system is reminiscent of the socalled evolved multimedia broadcast multicast service embms in the sense that the fundamental underlying transmission mechanism is multipoint multicasting where each user can independently and individually in a usercentric manner decide which en to decode without any explicit association of users to ens we study the performance of the proposed system when users and ens are distributed according to homogeneous poisson point processes in the plane and the propagation is affected by rayleigh fading and distance dependent pathloss our analysis allows the system optimization with respect to the mds coding rate also we show that the proposed system is fully scalable in the sense that it can support an arbitrarily large number of users while maintaining a nonvanishing peruser delivery rate
|
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|
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|
1,803.05703
|
The Duffin-Schaeffer conjecture with extra divergence
|
The Duffin-Schaeffer conjecture is a fundamental unsolved problem in metric
number theory. It asserts that for every non-negative function
$\psi:~\mathbb{N} \rightarrow \mathbb{R}$ for almost all reals $x$ there are
infinitely many coprime solutions $(a,n)$ to the inequality $|nx - a| <
\psi(n)$, provided that the series $\sum_{n=1}^\infty \psi(n) \varphi(n) /n$ is
divergent. In the present paper we prove that the conjecture is true under the
"extra divergence" assumption that divergence of the series still holds when
$\psi(n)$ is replaced by $\psi(n) / (\log n)^\varepsilon$ for some $\varepsilon
> 0$. This improves a result of Beresnevich, Harman, Haynes and Velani, and
solves a problem posed by Haynes, Pollington and Velani.
|
math.NT
|
the duffinschaeffer conjecture is a fundamental unsolved problem in metric number theory it asserts that for every nonnegative function psimathbbn rightarrow mathbbr for almost all reals x there are infinitely many coprime solutions an to the inequality nx a psin provided that the series sum_n1infty psin varphin n is divergent in the present paper we prove that the conjecture is true under the extra divergence assumption that divergence of the series still holds when psin is replaced by psin log nvarepsilon for some varepsilon 0 this improves a result of beresnevich harman haynes and velani and solves a problem posed by haynes pollington and velani
|
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|
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|
1,803.05704
|
Combinatorial analogs of topological zeta functions
|
In this article we introduce a new matroid invariant, a combinatorial analog
of the topological zeta function of a polynomial. More specifically we
associate to any ranked, atomic meet-semilattice L a rational function Z(L,s),
in such a way that when L is the lattice of flats of a complex hyperplane
arrangement we recover the usual topological zeta function. The definition is
in terms of a choice of a combinatorial analog of resolution of singularities,
and the main result is that Z(L,s) does not depend on this choice and depends
only on L. Known properties of the topological zeta function provide a source
of potential complex realisability test for matroids.
|
math.CO math.AG
|
in this article we introduce a new matroid invariant a combinatorial analog of the topological zeta function of a polynomial more specifically we associate to any ranked atomic meetsemilattice l a rational function zls in such a way that when l is the lattice of flats of a complex hyperplane arrangement we recover the usual topological zeta function the definition is in terms of a choice of a combinatorial analog of resolution of singularities and the main result is that zls does not depend on this choice and depends only on l known properties of the topological zeta function provide a source of potential complex realisability test for matroids
|
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|
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|
1,803.05705
|
Minimizing Crossings in Constrained Two-Sided Circular Graph Layouts
|
Circular layouts are a popular graph drawing style, where vertices are placed
on a circle and edges are drawn as straight chords. Crossing minimization in
circular layouts is \NP-hard. One way to allow for fewer crossings in practice
are two-sided layouts that draw some edges as curves in the exterior of the
circle. In fact, one- and two-sided circular layouts are equivalent to one-page
and two-page book drawings, i.e., graph layouts with all vertices placed on a
line (the spine) and edges drawn in one or two distinct half-planes (the pages)
bounded by the spine. In this paper we study the problem of minimizing the
crossings for a fixed cyclic vertex order by computing an optimal $k$-plane set
of exteriorly drawn edges for $k \ge 1$, extending the previously studied case
$k=0$. We show that this relates to finding bounded-degree maximum-weight
induced subgraphs of circle graphs, which is a graph-theoretic problem of
independent interest. We show \NP-hardness for arbitrary $k$, present an
efficient algorithm for $k=1$, and generalize it to an explicit \XP-time
algorithm for any fixed $k$. For the practically interesting case $k=1$ we
implemented our algorithm and present experimental results that confirm the
applicability of our algorithm.
|
cs.CG
|
circular layouts are a popular graph drawing style where vertices are placed on a circle and edges are drawn as straight chords crossing minimization in circular layouts is nphard one way to allow for fewer crossings in practice are twosided layouts that draw some edges as curves in the exterior of the circle in fact one and twosided circular layouts are equivalent to onepage and twopage book drawings ie graph layouts with all vertices placed on a line the spine and edges drawn in one or two distinct halfplanes the pages bounded by the spine in this paper we study the problem of minimizing the crossings for a fixed cyclic vertex order by computing an optimal kplane set of exteriorly drawn edges for k ge 1 extending the previously studied case k0 we show that this relates to finding boundeddegree maximumweight induced subgraphs of circle graphs which is a graphtheoretic problem of independent interest we show nphardness for arbitrary k present an efficient algorithm for k1 and generalize it to an explicit xptime algorithm for any fixed k for the practically interesting case k1 we implemented our algorithm and present experimental results that confirm the applicability of our algorithm
|
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|
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|
1,803.05706
|
Measurement of absolute branching fraction of the inclusive decay
$\Lambda_{c}^{+} \to \Lambda + X$
|
Based on an $e^+e^-$ collision data sample corresponding to an integrated
luminosity of 567$\,\rm{pb}^{-1}$ taken at the center-of-mass energy of
$\sqrt{s} = 4.6$ GeV with the BESIII detector, we measure the absolute
branching fraction of the inclusive decay $\Lambda_{c}^{+} \to \Lambda + X$ to
be $\mathcal{B}(\Lambda_{c}^{+} \to \Lambda + X)=(38.2^{+2.8}_{-2.2}\pm0.8)\%$
using the double-tag method, where $X$ refers to any possible final state
particles. In addition, we search for direct CP violation in the charge
asymmetry of this inclusive decay for the first time, and obtain
$\mathcal{A}_{CP} \equiv \frac{\mathcal{B}(\Lambda_{c}^{+} \to \Lambda +
X)-\mathcal{B}(\bar{\Lambda}_{c}^{-} \to \bar{\Lambda} +
X)}{\mathcal{B}(\Lambda_{c}^{+} \to \Lambda +
X)+\mathcal{B}(\bar{\Lambda}_{c}^{-} \to \bar{\Lambda} + X)} =
(2.1^{+7.0}_{-6.6}\pm1.4)\%$, a statistically limited result with no evidence
of CP violation.
|
hep-ex
|
based on an ee collision data sample corresponding to an integrated luminosity of 567rmpb1 taken at the centerofmass energy of sqrts 46 gev with the besiii detector we measure the absolute branching fraction of the inclusive decay lambda_c to lambda x to be mathcalblambda_c to lambda x38228_22pm08 using the doubletag method where x refers to any possible final state particles in addition we search for direct cp violation in the charge asymmetry of this inclusive decay for the first time and obtain mathcala_cp equiv fracmathcalblambda_c to lambda xmathcalbbarlambda_c to barlambda xmathcalblambda_c to lambda xmathcalbbarlambda_c to barlambda x 2170_66pm14 a statistically limited result with no evidence of cp violation
|
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|
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|
1,803.05707
|
Efficient Calibration of Radio Interferometers Using Block LDU
Decomposition
|
Having an accurate calibration method is crucial for any scientific research
done by a radio telescope. The next generation radio telescopes such as the
Square Kilometre Array (SKA) will have a large number of receivers which will
produce exabytes of data per day. In this paper we propose new
direction-dependent and independent calibration algorithms that, while
requiring much less storage during calibration, converge very fast. The
calibration problem can be formulated as a non-linear least square optimization
problem. We show that combining a block-LDU decomposition with Gauss-Newton
iterations produces systems of equations with convergent matrices. This allows
significant reduction in complexity per iteration and very fast converging
algorithms. We also discuss extensions to direction-dependent calibration. The
proposed algorithms are evaluated using simulations.
|
astro-ph.IM
|
having an accurate calibration method is crucial for any scientific research done by a radio telescope the next generation radio telescopes such as the square kilometre array ska will have a large number of receivers which will produce exabytes of data per day in this paper we propose new directiondependent and independent calibration algorithms that while requiring much less storage during calibration converge very fast the calibration problem can be formulated as a nonlinear least square optimization problem we show that combining a blockldu decomposition with gaussnewton iterations produces systems of equations with convergent matrices this allows significant reduction in complexity per iteration and very fast converging algorithms we also discuss extensions to directiondependent calibration the proposed algorithms are evaluated using simulations
|
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|
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|
1,803.05708
|
Anomalous scaling of dynamical large deviations
|
The typical values and fluctuations of time-integrated observables of
nonequilibrium processes driven in steady states are known to be characterized
by large deviation functions, generalizing the entropy and free energy to
nonequilibrium systems. The definition of these functions involves a scaling
limit, similar to the thermodynamic limit, in which the integration time $\tau$
appears linearly, unless the process considered has long-range correlations, in
which case $\tau$ is generally replaced by $\tau^\xi$ with $\xi\neq 1$. Here we
show that such an anomalous power-law scaling in time of large deviations can
also arise without long-range correlations in Markovian processes as simple as
the Langevin equation. We describe the mechanism underlying this scaling using
path integrals and discuss its physical consequences for more general
processes.
|
cond-mat.stat-mech
|
the typical values and fluctuations of timeintegrated observables of nonequilibrium processes driven in steady states are known to be characterized by large deviation functions generalizing the entropy and free energy to nonequilibrium systems the definition of these functions involves a scaling limit similar to the thermodynamic limit in which the integration time tau appears linearly unless the process considered has longrange correlations in which case tau is generally replaced by tauxi with xineq 1 here we show that such an anomalous powerlaw scaling in time of large deviations can also arise without longrange correlations in markovian processes as simple as the langevin equation we describe the mechanism underlying this scaling using path integrals and discuss its physical consequences for more general processes
|
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|
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|
1,803.05709
|
Low Temperature Ageing Behaviour of U-Nb $\alpha''$ Phase Alloys
|
Ageing mechanisms of the U-5\,\%wtNb system have been investigated on samples
exposed to temperatures of 150$\,^{\circ}$C for up to 5000\,hours. A variety of
surface and bulk analytic techniques have been used to investigate phase,
chemical and crystallographic changes. Characterisation of microstructural
evolution was carried out through secondary electron microscopy (SEM), energy
dispersive x-ray spectroscopy (EDS), electron backscatter diffraction (EBSD),
transmission electron microscopy (TEM) and x-ray diffraction (XRD). This
investigation suggests crystallographic defects such as twinning furthers the
martensitic tendencies with ageing. Resizing of the lattice and shuffling of
atoms results in a small progression from the $\alpha''$ towards the $\alpha'$
phase.
|
cond-mat.mtrl-sci
|
ageing mechanisms of the u5wtnb system have been investigated on samples exposed to temperatures of 150circc for up to 5000hours a variety of surface and bulk analytic techniques have been used to investigate phase chemical and crystallographic changes characterisation of microstructural evolution was carried out through secondary electron microscopy sem energy dispersive xray spectroscopy eds electron backscatter diffraction ebsd transmission electron microscopy tem and xray diffraction xrd this investigation suggests crystallographic defects such as twinning furthers the martensitic tendencies with ageing resizing of the lattice and shuffling of atoms results in a small progression from the alpha towards the alpha phase
|
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|
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|
1,803.0571
|
Perturbations to $\mu-\tau$ symmetry, lepton Number Violation and
baryogenesis in left-right symmetric Model
|
In this work, we studied baryogenesis via leptogenesis, neutrinoless double
beta decay (NDBD) in the framework of LRSM where type I and type II seesaw
terms arises naturally. The type I seesaw mass term is considered to be
favouring $\mu-\tau$ symmetry, taking into account the widely studied
realizations of $\mu-\tau$ symmetric neutrino mass models, viz. Tribimaximal
Mixing (TBM), Hexagonal Mixing (HM) and Golden Ratio Mixing (GRM) respectively.
The required correction to generate a non vanishing reactor mixing angle
$\theta_{13}$ is obtained from the perturbation matrix, type II seesaw mass
term in our case. We studied the new physics contributions to NDBD and
baryogenesis ignoring the left-right gauge boson mixing and the heavy-light
neutrino mixing, keeping mass of the gauge bosons and scalars to be around TeV
and studied the effects of the new physics contributions on the effective mass,
NDBD half life and cosmological BAU and compared with the values imposed by
experiments. We basically tried to find the leading order contributions to NDBD
and BAU, coming from type I or type II seesaw in our work.
|
hep-ph
|
in this work we studied baryogenesis via leptogenesis neutrinoless double beta decay ndbd in the framework of lrsm where type i and type ii seesaw terms arises naturally the type i seesaw mass term is considered to be favouring mutau symmetry taking into account the widely studied realizations of mutau symmetric neutrino mass models viz tribimaximal mixing tbm hexagonal mixing hm and golden ratio mixing grm respectively the required correction to generate a non vanishing reactor mixing angle theta_13 is obtained from the perturbation matrix type ii seesaw mass term in our case we studied the new physics contributions to ndbd and baryogenesis ignoring the leftright gauge boson mixing and the heavylight neutrino mixing keeping mass of the gauge bosons and scalars to be around tev and studied the effects of the new physics contributions on the effective mass ndbd half life and cosmological bau and compared with the values imposed by experiments we basically tried to find the leading order contributions to ndbd and bau coming from type i or type ii seesaw in our work
|
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|
[-0.0663427093466165, 0.2551737043593542, 0.05233648386231418, 0.1791515790464062, -0.09920162966706406, -0.21331208870393661, 0.04628654051372139, 0.27523252470708204, -0.25925423153597166, -0.26110147649756404, 0.061096616339932935, -0.25352512936681343, -0.058873322265481476, 0.08106188541199318, 0.03256309271847966, -0.01306491970315794, -4.330325587573698e-05, -0.046617889687376846, -0.11266280854210299, -0.21678534505815156, 0.3255961989013131, 0.057796264350437956, 0.21706333912193437, 0.05138884166697577, 0.04000816858073665, -0.074124250632032, -0.05178929724083361, -0.09903480073089822, -0.14131818993785286, 0.012557876973786512, 0.13167994696079074, 0.07327523954096908, 0.07590986102145944, -0.3637504760744208, -0.1471621378161813, 0.16355047138976092, 0.1608710464321624, 0.09416794594335186, -0.12540580147527433, -0.31885877762405507, 0.032624480677610736, -0.2621968558444878, -0.11267067520816068, -0.025993517518443407, -0.04185247912182141, -0.14365968038492422, -0.4115050809910405, 0.11652769656154054, -0.024529283329591912, -0.037332184762709726, 0.013759443304885578, -0.2100158908567523, -0.01903033457001892, 0.030579352960527197, 0.22538868267362738, -0.0749550318519064, 0.09997772007041458, -0.13806943288881932, -0.10747921407370076, 0.4642455332865149, -0.09994398484777364, -0.1414447900402428, 0.09766932139383619, -0.15941231387883087, -0.14306104122753133, 0.08122130442347567, 0.16475443746157958, 0.044787254176756344, -0.1577551495740953, 0.19272841270822286, -0.02835689974543612, 0.12149256781877497, 0.0666855022792657, 0.012724309996570234, 0.24281947870375747, 0.1786857230580901, 0.01703637052790425, -0.036689315602128424, -0.10062775695775399, -0.10407140788932641, -0.4117269984967375, -0.0889393623844631, -0.08167401282314085, 0.09109800164771956, -0.0790635638719518, -0.11352233666963454, 0.4504529403333189, 0.09573735982590055, 0.20311412739562196, 0.037925873703512726, 0.2499707166952644, 0.08323442405168661, 0.12884084954542124, -0.0018356105517911708, 0.31435575146270167, 0.19632570280451433, 0.13075509271715993, -0.2867915135700424, 0.01302824522458059, 0.15301699535710747]
|
1,803.05711
|
Hyperelastic deformations and total combined energy of mappings between
annuli
|
We consider the so called combined energy of a deformation between two
concentric annuli and minimize it, provided that it keep order of the
boundaries. It is an extension of the corresponding result of Euclidean energy.
It is intrigue that, the minimizers are certain radial mappings and they exists
if and only if the annulus on the image domain is not too thin, provided that
the original annulus is fixed. This in turn implies a Nitsche type phenomenon.
Next we consider the combined distortion and obtain certain related results
which are dual to the results for combined energy, which also involve some
Nitche type phenomenon.
{The main part of the paper is concerned with the total combined energy, a
certain integral operator, defined as a convex linear combination of the
combined energy and combined distortion, of diffeomorphisms between two
concentric annuli $\A(1,r)$ and $\B(1,R)$. First we construct radial minimizers
of total combined energy, then we prove that those radial minimizers are
absolute minimizers on the class of all mappings between the annuli under
certain constraint. This extends the main result obtained by Iwaniec and
Onninen in \cite{arma}.}
|
math.CV
|
we consider the so called combined energy of a deformation between two concentric annuli and minimize it provided that it keep order of the boundaries it is an extension of the corresponding result of euclidean energy it is intrigue that the minimizers are certain radial mappings and they exists if and only if the annulus on the image domain is not too thin provided that the original annulus is fixed this in turn implies a nitsche type phenomenon next we consider the combined distortion and obtain certain related results which are dual to the results for combined energy which also involve some nitche type phenomenon the main part of the paper is concerned with the total combined energy a certain integral operator defined as a convex linear combination of the combined energy and combined distortion of diffeomorphisms between two concentric annuli a1r and b1r first we construct radial minimizers of total combined energy then we prove that those radial minimizers are absolute minimizers on the class of all mappings between the annuli under certain constraint this extends the main result obtained by iwaniec and onninen in citearma
|
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|
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|
1,803.05712
|
Preparation and analysis of strain-free uranium surfaces for electron
and x-ray diffraction analysis
|
This work describes a methodology for producing high quality metallic
surfaces from uranium primarily for characterisation and investigations
involving electron backscatter diffraction. Electrochemical measurements have
been conducted to inform ideal polishing conditions to produce surfaces free
from strain, induced by mechanical polishing. A commonly used solution for the
electropolishing of uranium, consisting in part of phosphoric acid, was used to
conduct the electrochemical experiments and polishing. X-ray diffraction
techniques focusing on the surface show low stresses and strains are exhibited
within the material. This is mirrored in good quality electron backscatter
diffraction.
|
cond-mat.mtrl-sci
|
this work describes a methodology for producing high quality metallic surfaces from uranium primarily for characterisation and investigations involving electron backscatter diffraction electrochemical measurements have been conducted to inform ideal polishing conditions to produce surfaces free from strain induced by mechanical polishing a commonly used solution for the electropolishing of uranium consisting in part of phosphoric acid was used to conduct the electrochemical experiments and polishing xray diffraction techniques focusing on the surface show low stresses and strains are exhibited within the material this is mirrored in good quality electron backscatter diffraction
|
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|
[-0.047524159824799586, 0.12952145027077716, -0.0828171233898383, -0.00482127695273527, -0.011332415051900012, -0.11744248146272224, 0.06720298695891751, 0.44394673439471616, -0.23177955189274382, -0.3336843121189462, 0.065804408850533, -0.33330438502699783, -0.11431575662699407, 0.25079299943805067, -0.08633304721645443, 0.11982575788027569, 0.043347454123684896, -0.08494379760130592, -0.06472396385430804, -0.19465512081818737, 0.22776571405120194, 0.11482910765334964, 0.3672214154528616, 0.08587879032078806, 0.07307859631154039, 0.029421989045500675, 0.0183804872567239, 0.02592935267349948, -0.16453181713586673, 0.11568440158340387, 0.30153033296253695, -0.006777905886891582, 0.18757075912055923, -0.5227658481175161, -0.27284604097392573, -0.014650720776483902, 0.039346910582895835, 0.05695497083639645, -0.1290507318980931, -0.1968556919094661, 0.07783758430741727, -0.11054720281263934, -0.118518156399343, -0.11133033810588329, -0.08931785559727122, 0.060583704819335886, -0.24786280739404584, 0.058880365683960365, 0.010761442406953352, 0.1603687299559723, -0.14224122802261263, -0.08201446680291354, -0.03342522038956699, 0.07415256999514025, 0.03927616689242828, -0.0033555609558749457, 0.22731852308725534, -0.05832479734722849, -0.0478351022845701, 0.41386085570506426, -0.0009366785500036633, -0.10983988043406735, 0.2068420780984604, -0.15103274458796595, -0.0784907269180226, 0.2283123467704686, 0.1458827806801191, 0.1051833092680444, -0.2113128358133785, 0.016392517137358918, 0.05110976151595621, 0.1746168058686991, 0.19179735337282813, -0.019627684889280277, 0.1855614310454415, 0.24736912315837917, -0.007325245864669104, 0.1533833278707512, -0.1314626863939971, 0.07995341611904619, -0.17481329483384994, -0.19157365133540463, -0.1579120835117267, 0.0796180932514329, 0.009073007753613638, -0.19091190413936324, 0.33502124840110215, 0.08572503046699516, 0.09404106679089043, -0.1142022558791644, 0.30466369474711624, 0.01313245945240614, 0.0585116662044564, -0.049850609512878175, 0.25255476351974165, 0.14096793724203724, 0.12266562270182792, -0.2481109627722459, 0.10760353211536193, 0.02932759874459842]
|
1,803.05713
|
Drop-Wise and Film-Wise Water Condensation Processes Occurring on
Metallic Micro-Scaled Surfaces
|
Water condensation was studied on silanized (superhydrophobic) and
fluorinated (superoleophobic) micro-rough aluminum surfaces of the same
topography. Condensation on superhydrophobic surfaces occurred via film-wise
mechanism, whereas on superoleophobic surfaces it was drop-wise. The difference
in the pathways of condensation was attributed to the various energy barriers
separating the Cassie and Wenzel wetting states on the investigated surfaces.
The higher barriers inherent for superoleophobic surfaces promoted the
drop-wise condensation. Triple-stage kinetics of growth of droplets condensed
on superoleophobic surfaces is reported and discussed.
|
physics.app-ph cond-mat.soft
|
water condensation was studied on silanized superhydrophobic and fluorinated superoleophobic microrough aluminum surfaces of the same topography condensation on superhydrophobic surfaces occurred via filmwise mechanism whereas on superoleophobic surfaces it was dropwise the difference in the pathways of condensation was attributed to the various energy barriers separating the cassie and wenzel wetting states on the investigated surfaces the higher barriers inherent for superoleophobic surfaces promoted the dropwise condensation triplestage kinetics of growth of droplets condensed on superoleophobic surfaces is reported and discussed
|
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|
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|
1,803.05714
|
r-HUMO: A Risk-Aware Human-Machine Cooperation Framework for Entity
Resolution with Quality Guarantees
|
Even though many approaches have been proposed for entity resolution (ER), it
remains very challenging to find one with quality guarantees. To this end, we
proposea risk-aware HUman-Machine cOoperation framework for ER, denoted by
r-HUMO. Built on the existing HUMO framework, r-HUMO similarly enforces both
precision and recall levels by partitioning an ER workload between the human
and the machine. However, r-HUMO is the first solution to optimize the process
of human workload selection from a risk perspective. It iteratively selects
human workload based on real-time risk analysis on human-labeled results as
well as prespecified machine metrics. In this paper,we first introduce the
r-HUMO framework and then present the risk analysis technique to prioritize the
instances for manual labeling. Finally,we empirically evaluate r-HUMO's
performance on real data. Our extensive experiments show that r-HUMO is
effective in enforcing quality guarantees,and compared with the
state-of-the-art alternatives, it can achieve better quality control with
reduced human cost.
|
cs.HC cs.DB
|
even though many approaches have been proposed for entity resolution er it remains very challenging to find one with quality guarantees to this end we proposea riskaware humanmachine cooperation framework for er denoted by rhumo built on the existing humo framework rhumo similarly enforces both precision and recall levels by partitioning an er workload between the human and the machine however rhumo is the first solution to optimize the process of human workload selection from a risk perspective it iteratively selects human workload based on realtime risk analysis on humanlabeled results as well as prespecified machine metrics in this paperwe first introduce the rhumo framework and then present the risk analysis technique to prioritize the instances for manual labeling finallywe empirically evaluate rhumos performance on real data our extensive experiments show that rhumo is effective in enforcing quality guaranteesand compared with the stateoftheart alternatives it can achieve better quality control with reduced human cost
|
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|
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|
1,803.05715
|
On the jet properties of the gamma-ray loud active galactic nuclei
|
Based on broadband spectral energy distribution (SEDs), we estimate the jet
physical parameters of 1392 $\gamma$-ray-loud active galactic nuclei (AGNs),
the largest sample so far. The (SED) jet power and magnetization parameter are
derived for these AGNs. Out of these sources, the accretion disk luminosity of
232 sources and (extended) kinetic jet powers of 159 sources are compiled from
archived papers. We find the following, (1) Flat-spectrum radio quasars (FSRQs)
and BL Lacs are well separated by $\Gamma=-0.127\log L_{\gamma}+8.18$, in
$\gamma$-ray luminosity versus photon index plane with a success rate of
88.6\%. (2) Most FSRQs present a (SED) jet power larger than the accretion
power, which suggests that the relativistic jet-launching mechanism is
dominated by the Blandford-Znajek process. This result confirms previous
findings. (3) There is asignificant anticorrelation between jet magnetization
and a ratio of the (SED) jet power to the (extended) kinetic jet power, which,
for the first time, provides supporting evidence for the jet energy
transportation theory: a high-magnetization jet may be more easily to transport
energy to a large scale than a low-magnetization jet.
|
astro-ph.HE astro-ph.GA
|
based on broadband spectral energy distribution seds we estimate the jet physical parameters of 1392 gammarayloud active galactic nuclei agns the largest sample so far the sed jet power and magnetization parameter are derived for these agns out of these sources the accretion disk luminosity of 232 sources and extended kinetic jet powers of 159 sources are compiled from archived papers we find the following 1 flatspectrum radio quasars fsrqs and bl lacs are well separated by gamma0127log l_gamma818 in gammaray luminosity versus photon index plane with a success rate of 886 2 most fsrqs present a sed jet power larger than the accretion power which suggests that the relativistic jetlaunching mechanism is dominated by the blandfordznajek process this result confirms previous findings 3 there is asignificant anticorrelation between jet magnetization and a ratio of the sed jet power to the extended kinetic jet power which for the first time provides supporting evidence for the jet energy transportation theory a highmagnetization jet may be more easily to transport energy to a large scale than a lowmagnetization jet
|
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|
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|
1,803.05716
|
Magnetars: a short review and some sparse considerations
|
We currently know about 30 magnetars: seemingly isolated neutron stars whose
properties can be (in part) comprehended only acknowledging that they are
endowed with magnetic fields of complex morphology and exceptional intensity-at
least in some components of the field structure. Although magnetars represent
only a small percentage of the known isolated neutron stars, there are almost
certainly many more of them, since most magnetars were discovered in transitory
phases called outbursts, during which they are particularly noticeable. In
outburst, in fact, a magnetar can be brighter in X-rays by orders of magnitude
and usually emit powerful bursts of hard-X/soft-gamma-ray photons that can be
detected almost everywhere in the Galaxy with all-sky monitors such as those on
board the Fermi satellite or the Neil Gehrels Swift Observatory. Magnetars
command great attention because the large progress that has been made in their
understanding is proving fundamental to fathom the whole population of isolated
neutron stars, and because, due to their extreme properties, they are relevant
for a vast range of different astrophysical topics, from the study of gamma-ray
bursts and superluminous supernovae, to ultraluminous X-ray sources, fast radio
bursts, and even to sources of gravitational waves. Several excellent reviews
with different focuses were published on magnetars in the last few years: among
others, Israel and Dall'Osso (2011); Rea and Esposito (2011); Turolla and
Esposito (2013); Mereghetti et al. (2015); Turolla et al. (2015); Kaspi and
Beloborodov (2017). Here, we quickly recall the history of these sources and
travel through the main observational facts, trying to touch some recent and
sometimes little-discussed ramifications of magnetars.
|
astro-ph.HE
|
we currently know about 30 magnetars seemingly isolated neutron stars whose properties can be in part comprehended only acknowledging that they are endowed with magnetic fields of complex morphology and exceptional intensityat least in some components of the field structure although magnetars represent only a small percentage of the known isolated neutron stars there are almost certainly many more of them since most magnetars were discovered in transitory phases called outbursts during which they are particularly noticeable in outburst in fact a magnetar can be brighter in xrays by orders of magnitude and usually emit powerful bursts of hardxsoftgammaray photons that can be detected almost everywhere in the galaxy with allsky monitors such as those on board the fermi satellite or the neil gehrels swift observatory magnetars command great attention because the large progress that has been made in their understanding is proving fundamental to fathom the whole population of isolated neutron stars and because due to their extreme properties they are relevant for a vast range of different astrophysical topics from the study of gammaray bursts and superluminous supernovae to ultraluminous xray sources fast radio bursts and even to sources of gravitational waves several excellent reviews with different focuses were published on magnetars in the last few years among others israel and dallosso 2011 rea and esposito 2011 turolla and esposito 2013 mereghetti et al 2015 turolla et al 2015 kaspi and beloborodov 2017 here we quickly recall the history of these sources and travel through the main observational facts trying to touch some recent and sometimes littlediscussed ramifications of magnetars
|
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|
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|
1,803.05717
|
A Chekanov-Eliashberg algebra for Legendrian graphs
|
We define a differential graded algebra for Legendrian graphs and tangles in
the standard contact Euclidean three space. This invariant is defined
combinatorially by using ideas from Legendrian contact homology. The
construction is distinguished from other versions of Legendrian contact algebra
by the vertices of Legendrian graphs. A set of countably many generators and a
generalized notion of equivalence are introduced for invariance. We show a van
Kampen type theorem for the differential graded algebras under the tangle
replacement. Our construction recovers many known algebraic constructions of
Legendrian links via suitable operations at the vertices.
|
math.SG math.GT
|
we define a differential graded algebra for legendrian graphs and tangles in the standard contact euclidean three space this invariant is defined combinatorially by using ideas from legendrian contact homology the construction is distinguished from other versions of legendrian contact algebra by the vertices of legendrian graphs a set of countably many generators and a generalized notion of equivalence are introduced for invariance we show a van kampen type theorem for the differential graded algebras under the tangle replacement our construction recovers many known algebraic constructions of legendrian links via suitable operations at the vertices
|
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|
[-0.2446878231669727, 0.07193093007724537, -0.07660716207894055, 0.11759873411593665, -0.12061900333746484, -0.19209733962228423, -0.018705417159454604, 0.2960170766632808, -0.37982669374660444, -0.26732210956121744, 0.052908909074520984, -0.2568077972575434, -0.19028237280190774, 0.1804213946587161, -0.19471647794309416, 0.017637125196817673, 0.1500345519057622, 0.07058505322294016, -0.10431996548891459, -0.23437643843261818, 0.45115349895663953, -0.06920207224075535, 0.19163706086968121, 0.04458619627403095, 0.1672120878914077, 0.040976002709449906, -0.03876863045274819, 0.06588487559898855, -0.23728551559248254, 0.10292799670102173, 0.2966383823316152, 0.044959485354392155, 0.1156114939943348, -0.3630189838378053, -0.08612465546160054, 0.16673791401798985, 0.10916977144569452, 0.021899061012817057, 0.03693900533804768, -0.32428125148933185, 0.0713329063189265, -0.18942281227362784, -0.1339262026362121, -0.06933352271290986, 0.024817056801954382, 0.024131968382157778, -0.16517953039882213, -0.06074200431865297, 0.12222404107451439, 0.152140713404668, 0.04919365524363361, -0.052020715803251065, -0.0882103328127414, 0.06270674590609576, -0.0692693934383753, 0.02713177469068844, 0.13854514985884492, -0.06944706839215206, -0.22033828294002697, 0.34157109348789644, -0.022772323644082798, -0.27606769322760794, 0.1465774564587168, -0.08332257481095823, -0.24612114602503807, 0.14353288019468124, -0.0019276344462444907, 0.11915625212223906, -0.11013485835221792, 0.1953130807911389, -0.11227546240154065, -0.04259499893768837, 0.1638585219698909, -0.03141548986497678, 0.12203186097015675, 0.10264795775476256, 0.0844044720937841, 0.19192882701693298, 0.05315762644535617, -0.09220431774462524, -0.35501438016562087, -0.21682806729743453, -0.11515720363608316, 0.14046831828002868, -0.16473900541926637, -0.20232798292448645, 0.3759827742350018, 0.01911838166905861, 0.1670114048805676, 0.20764125098327274, 0.2527923700032069, 0.007986986394634618, 0.15429473742842675, 0.08741755179668728, 0.12306157002274536, 0.2496568802989235, -0.0002972637940394251, -0.03868795318136874, 0.008742553971119617, 0.3111591200001146]
|
1,803.05718
|
Approximating Max-Cut under Graph-MSO Constraints
|
We consider the max-cut and max-$k$-cut problems under graph-based
constraints. Our approach can handle any constraint specified using monadic
second-order (MSO) logic on graphs of constant treewidth. We give a
$\frac{1}{2}$-approximation algorithm for this class of problems.
|
cs.CC
|
we consider the maxcut and maxkcut problems under graphbased constraints our approach can handle any constraint specified using monadic secondorder mso logic on graphs of constant treewidth we give a frac12approximation algorithm for this class of problems
|
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|
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|
1,803.05719
|
SAF- BAGE: Salient Approach for Facial Soft-Biometric Classification -
Age, Gender, and Facial Expression
|
How can we improve the facial soft-biometric classification with help of the
human visual system? This paper explores the use of saliency which is
equivalent to the human visual system to classify Age, Gender and Facial
Expression soft-biometric for facial images. Using the Deep Multi-level Network
(ML-Net) [1] and off-the-shelf face detector [2], we propose our approach -
SAF-BAGE, which first detects the face in the test image, increases the
Bounding Box (B-Box) margin by 30%, finds the saliency map using ML-Net, with
30% reweighted ratio of saliency map, it multiplies with the input cropped face
and extracts the Convolutional Neural Networks (CNN) predictions on the
multiplied reweighted salient face. Our CNN uses the model AlexNet [3], which
is pre-trained on ImageNet. The proposed approach surpasses the performance of
other approaches, increasing the state-of-the-art by approximately 0.8% on the
widely-used Adience [28] dataset for Age and Gender classification and by
nearly 3% on the recent AffectNet [36] dataset for Facial Expression
classification. We hope our simple, reproducible and effective approach will
help ease future research in facial soft-biometric classification using
saliency.
|
cs.CV
|
how can we improve the facial softbiometric classification with help of the human visual system this paper explores the use of saliency which is equivalent to the human visual system to classify age gender and facial expression softbiometric for facial images using the deep multilevel network mlnet 1 and offtheshelf face detector 2 we propose our approach safbage which first detects the face in the test image increases the bounding box bbox margin by 30 finds the saliency map using mlnet with 30 reweighted ratio of saliency map it multiplies with the input cropped face and extracts the convolutional neural networks cnn predictions on the multiplied reweighted salient face our cnn uses the model alexnet 3 which is pretrained on imagenet the proposed approach surpasses the performance of other approaches increasing the stateoftheart by approximately 08 on the widelyused adience 28 dataset for age and gender classification and by nearly 3 on the recent affectnet 36 dataset for facial expression classification we hope our simple reproducible and effective approach will help ease future research in facial softbiometric classification using saliency
|
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|
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|
1,803.0572
|
Electronic and mechanical properties of few-layer borophene
|
We report first principle calculations of electronic and mechanical
properties of few-layer borophene with the inclusion of interlayer van der
Waals (vdW) interaction. The anisotropic metallic behaviors are preserved from
monolayer to few-layer structures. The energy splitting of bilayer borophene at
$\Gamma$ point near the Fermi level is about 1.7 eV, much larger than the
values (0.5--1 eV) of other layered semiconductors, indicating much stronger
vdW interactions in metallic layered borophene. In particular, the critical
strains are enhanced by increasing the number of layers, leading to much more
flexibility than that of monolayer structure. On the one hand, because of the
buckled atomic structures, the out-of-plane negative Poisson's ratios are
preserved as the layer-number increases. On the other hand, we find that the
in-plane negative Poisson's ratios disappear in layered borophene, which is
very different from puckered black phosphorus. The negative Poisson's ratio
will recover if we enlarge the interlayer distance to 6.3 $\mbox\AA$,
indicating that the physical origin behind the change of Poisson's ratios is
the strong interlayer vdW interactions in layered borophene.
|
cond-mat.mtrl-sci
|
we report first principle calculations of electronic and mechanical properties of fewlayer borophene with the inclusion of interlayer van der waals vdw interaction the anisotropic metallic behaviors are preserved from monolayer to fewlayer structures the energy splitting of bilayer borophene at gamma point near the fermi level is about 17 ev much larger than the values 051 ev of other layered semiconductors indicating much stronger vdw interactions in metallic layered borophene in particular the critical strains are enhanced by increasing the number of layers leading to much more flexibility than that of monolayer structure on the one hand because of the buckled atomic structures the outofplane negative poissons ratios are preserved as the layernumber increases on the other hand we find that the inplane negative poissons ratios disappear in layered borophene which is very different from puckered black phosphorus the negative poissons ratio will recover if we enlarge the interlayer distance to 63 mboxaa indicating that the physical origin behind the change of poissons ratios is the strong interlayer vdw interactions in layered borophene
|
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|
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|
1,803.05721
|
Explicit equations for exterior square of the general linear group
|
We present several explicit systems of equations defining exterior square of
the general linear group as an affine group scheme. Algebraic ingredients of
the equations, exterior numbers, are translated into the language of weight
diagrams corresponding to Lie groups of type $A_{n-1}$ in representation with
the highest weight $\varpi_{2}$.
|
math.GR math.RT
|
we present several explicit systems of equations defining exterior square of the general linear group as an affine group scheme algebraic ingredients of the equations exterior numbers are translated into the language of weight diagrams corresponding to lie groups of type a_n1 in representation with the highest weight varpi_2
|
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|
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|
1,803.05722
|
Realizations of Indecomposable Persistence Modules of Arbitrarily Large
Dimension
|
While persistent homology has taken strides towards becoming a wide-spread
tool for data analysis, multidimensional persistence has proven more difficult
to apply. One reason is the serious drawback of no longer having a concise and
complete descriptor analogous to the persistence diagrams of the former. We
propose a simple algebraic construction to illustrate the existence of infinite
families of indecomposable persistence modules over regular grids of sufficient
size. On top of providing a constructive proof of representation infinite type,
we also provide realizations by topological spaces and Vietoris-Rips
filtrations, showing that they can actually appear in real data and are not the
product of degeneracies.
|
math.AT
|
while persistent homology has taken strides towards becoming a widespread tool for data analysis multidimensional persistence has proven more difficult to apply one reason is the serious drawback of no longer having a concise and complete descriptor analogous to the persistence diagrams of the former we propose a simple algebraic construction to illustrate the existence of infinite families of indecomposable persistence modules over regular grids of sufficient size on top of providing a constructive proof of representation infinite type we also provide realizations by topological spaces and vietorisrips filtrations showing that they can actually appear in real data and are not the product of degeneracies
|
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|
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|
1,803.05723
|
The Dark $L_\mu - L_\tau$ Rises via Kinetic Mixing
|
We investigate the dark matter phenomenology of a Dirac fermion together with
kinetic mixing in the context of an $L_\mu - L_\tau$ model. We analyze which
part of the parameter space can provide a viable dark matter candidate and
explain the B-decay anomaly, while obeying current data. Although the allowed
region of parameter space, satisfying these requirements, is still large at the
moment, future direct detection experiments like XENONnT and DARWIN will, in
case of null results, significantly strengthen the limits and push the model to
a corner of the parameter space.
|
hep-ph
|
we investigate the dark matter phenomenology of a dirac fermion together with kinetic mixing in the context of an l_mu l_tau model we analyze which part of the parameter space can provide a viable dark matter candidate and explain the bdecay anomaly while obeying current data although the allowed region of parameter space satisfying these requirements is still large at the moment future direct detection experiments like xenonnt and darwin will in case of null results significantly strengthen the limits and push the model to a corner of the parameter space
|
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|
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|
1,803.05724
|
Conductivity of higher dimensional holographic superconductors with
nonlinear electrodynamics
|
We investigate analytically as well as numerically the properties of s-wave
holographic superconductors in $d$-dimensional spacetime and in the presence of
Logarithmic nonlinear electrodynamics. We study three aspects of these kind of
superconductors. First, we obtain, by employing analytical Sturm-Liouville
method as well as numerical shooting method, the relation between critical
temperature and charge density, $\rho$, and disclose the effects of both
nonlinear parameter $b$ and the dimensions of spacetime, $d$, on the critical
temperature $T_c$. We find that in each dimension, $T_c/{\rho}^{1/(d-2)}$
decreases with increasing the nonlinear parameter $b$ while it increases with
increasing the dimension of spacetime for a fixed value of $b$. Then, we
calculate the condensation value and critical exponent of the system
analytically and numerically and observe that in each dimension, the
condensation get larger with increasing the nonlinear parameter $b$. Besides,
for a fixed value of $b$, it increases with increasing the spacetime dimension.
We confirm that the results obtained from our analytical method are in
agreement with the results obtained from numerical shooting method. This fact
may support the correctness of our analytical method. Finally, we explore the
holographic conductivity of this system and find out that the superconducting
gap increases with increasing either the nonlinear parameter or the spacetime
dimension.
|
hep-th gr-qc
|
we investigate analytically as well as numerically the properties of swave holographic superconductors in ddimensional spacetime and in the presence of logarithmic nonlinear electrodynamics we study three aspects of these kind of superconductors first we obtain by employing analytical sturmliouville method as well as numerical shooting method the relation between critical temperature and charge density rho and disclose the effects of both nonlinear parameter b and the dimensions of spacetime d on the critical temperature t_c we find that in each dimension t_crho1d2 decreases with increasing the nonlinear parameter b while it increases with increasing the dimension of spacetime for a fixed value of b then we calculate the condensation value and critical exponent of the system analytically and numerically and observe that in each dimension the condensation get larger with increasing the nonlinear parameter b besides for a fixed value of b it increases with increasing the spacetime dimension we confirm that the results obtained from our analytical method are in agreement with the results obtained from numerical shooting method this fact may support the correctness of our analytical method finally we explore the holographic conductivity of this system and find out that the superconducting gap increases with increasing either the nonlinear parameter or the spacetime dimension
|
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|
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|
1,803.05725
|
Holographic entanglement entropy for small subregions and thermalization
of Born-Infeld AdS black holes
|
AApplying the Born-Infeld Anti de Sitter charged black hole metric we
calculate holographic entanglement entropy (HEE) by regarding the proposal of
Ryu and Takanayagi. To do so we assume that time dependence of the black hole
mass and charge to be as step function. Our work is restricted to small
subregions where a collapsing null shell dose not penetrate the black holes
horizon. To calculate time dependent HEE we use perturbation method for small
subregions where turning point is much smaller than local equilibrium point of
black hole. We choose two shape functions for entangled regions on the boundary
which are the strip and the ball regions. There is a saturation time at which
the null shell grazes the turning point and the HEE reaches to its maximum
value. In general, this work satisfies result of the works presented by Camelio
et al and Zeng et al. We must point out that they used equal time two-point
correlation functions and Wilson loops instead of the entanglement entropy (EE)
as non-local observable to study this thermalization by applying the numerical
method.
|
hep-th
|
aapplying the borninfeld anti de sitter charged black hole metric we calculate holographic entanglement entropy hee by regarding the proposal of ryu and takanayagi to do so we assume that time dependence of the black hole mass and charge to be as step function our work is restricted to small subregions where a collapsing null shell dose not penetrate the black holes horizon to calculate time dependent hee we use perturbation method for small subregions where turning point is much smaller than local equilibrium point of black hole we choose two shape functions for entangled regions on the boundary which are the strip and the ball regions there is a saturation time at which the null shell grazes the turning point and the hee reaches to its maximum value in general this work satisfies result of the works presented by camelio et al and zeng et al we must point out that they used equal time twopoint correlation functions and wilson loops instead of the entanglement entropy ee as nonlocal observable to study this thermalization by applying the numerical method
|
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|
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|
1,803.05726
|
Looking at spacetime atoms from within the Lorentz sector
|
Recently, a proposal has been made to figure out the expected discrete nature
of spacetime at the smallest scales in terms of atoms of spacetime, capturing
their effects through a scalar $\rho$, function of the point $P$ and the vector
$v^a$ at $P$, expressing their density. This has been done in the Euclideanized
space one obtains through analytic continuation from Lorentzian sector at $P$.
$\rho$ is defined in terms of a peculiar `effective' metric $q_{ab}$, also
recently introduced, which stems from a careful request that $q_{ab}$ coincides
with $g_{ab}$ at large (space/time) distances, but gives finite distance in the
coincidence limit.
This work reports on an attempt to introduce a definition of $\rho$ directly
in the Lorentz sector. This turns out to be not a so trivial task, essentially
because of the null case, i.e. when $v^a$ is null, as in this case we lack even
a concept of $q_{ab}$. A notion for $q_{ab}$ in the null case is here proposed
and an expression for it is derived. In terms of it, an expression for $\rho$
can be derived, which turns out to coincide with what obtained from analytic
continuation. This, joined with the consideration of timelike/spacelike cases,
potentially completes a description of $q_{ab}$ and $\rho$ within Lorentz
spacetimes.
|
gr-qc
|
recently a proposal has been made to figure out the expected discrete nature of spacetime at the smallest scales in terms of atoms of spacetime capturing their effects through a scalar rho function of the point p and the vector va at p expressing their density this has been done in the euclideanized space one obtains through analytic continuation from lorentzian sector at p rho is defined in terms of a peculiar effective metric q_ab also recently introduced which stems from a careful request that q_ab coincides with g_ab at large spacetime distances but gives finite distance in the coincidence limit this work reports on an attempt to introduce a definition of rho directly in the lorentz sector this turns out to be not a so trivial task essentially because of the null case ie when va is null as in this case we lack even a concept of q_ab a notion for q_ab in the null case is here proposed and an expression for it is derived in terms of it an expression for rho can be derived which turns out to coincide with what obtained from analytic continuation this joined with the consideration of timelikespacelike cases potentially completes a description of q_ab and rho within lorentz spacetimes
|
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|
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|
1,803.05727
|
Multi-Hypothesis Visual-Inertial Flow
|
Estimating the correspondences between pixels in sequences of images is a
critical first step for a myriad of tasks including vision-aided navigation
(e.g., visual odometry (VO), visual-inertial odometry (VIO), and visual
simultaneous localization and mapping (VSLAM)) and anomaly detection. We
introduce a new unsupervised deep neural network architecture called the Visual
Inertial Flow (VIFlow) network and demonstrate image correspondence and optical
flow estimation by an unsupervised multi-hypothesis deep neural network
receiving grayscale imagery and extra-visual inertial measurements. VIFlow
learns to combine heterogeneous sensor streams and sample from an unknown,
un-parametrized noise distribution to generate several (4 or 8 in this work)
probable hypotheses on the pixel-level correspondence mappings between a source
image and a target image . We quantitatively benchmark VIFlow against several
leading vision-only dense correspondence and flow methods and show a
substantial decrease in runtime and increase in efficiency compared to all
methods with similar performance to state-of-the-art (SOA) dense correspondence
matching approaches. We also present qualitative results showing how VIFlow can
be used for detecting anomalous independent motion.
|
eess.IV cs.RO
|
estimating the correspondences between pixels in sequences of images is a critical first step for a myriad of tasks including visionaided navigation eg visual odometry vo visualinertial odometry vio and visual simultaneous localization and mapping vslam and anomaly detection we introduce a new unsupervised deep neural network architecture called the visual inertial flow viflow network and demonstrate image correspondence and optical flow estimation by an unsupervised multihypothesis deep neural network receiving grayscale imagery and extravisual inertial measurements viflow learns to combine heterogeneous sensor streams and sample from an unknown unparametrized noise distribution to generate several 4 or 8 in this work probable hypotheses on the pixellevel correspondence mappings between a source image and a target image we quantitatively benchmark viflow against several leading visiononly dense correspondence and flow methods and show a substantial decrease in runtime and increase in efficiency compared to all methods with similar performance to stateoftheart soa dense correspondence matching approaches we also present qualitative results showing how viflow can be used for detecting anomalous independent motion
|
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|
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|
1,803.05728
|
Radiative Corrections in GSDKP
|
We show explicit the first radiative correction for the vertex and
photon-photon 4-point function in Generalized Scalar Duffin-Kemmer-Petiau
Quantum Electrodynamcis (GSDKP), utilizing the dimensional regularization
method, where the gauge symmetry is manifest. As we shall see one of the
consequences of the study is that the DKP algebra ensures the functioning of
theWard- Takahashi-Fradkin (WTF) identities in the first radiative corrections
prohibiting certain ultraviolet (UV) divergences. This result leads us to ask
whether this connection between DKP algebra, UV divergences, and quantum gauge
symmetry (WTF) is a general statment.
|
physics.gen-ph hep-th
|
we show explicit the first radiative correction for the vertex and photonphoton 4point function in generalized scalar duffinkemmerpetiau quantum electrodynamcis gsdkp utilizing the dimensional regularization method where the gauge symmetry is manifest as we shall see one of the consequences of the study is that the dkp algebra ensures the functioning of theward takahashifradkin wtf identities in the first radiative corrections prohibiting certain ultraviolet uv divergences this result leads us to ask whether this connection between dkp algebra uv divergences and quantum gauge symmetry wtf is a general statment
|
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|
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|
1,803.05729
|
Exploring Linear Relationship in Feature Map Subspace for ConvNets
Compression
|
While the research on convolutional neural networks (CNNs) is progressing
quickly, the real-world deployment of these models is often limited by
computing resources and memory constraints. In this paper, we address this
issue by proposing a novel filter pruning method to compress and accelerate
CNNs. Our work is based on the linear relationship identified in different
feature map subspaces via visualization of feature maps. Such linear
relationship implies that the information in CNNs is redundant. Our method
eliminates the redundancy in convolutional filters by applying subspace
clustering to feature maps. In this way, most of the representative information
in the network can be retained in each cluster. Therefore, our method provides
an effective solution to filter pruning for which most existing methods
directly remove filters based on simple heuristics. The proposed method is
independent of the network structure, thus it can be adopted by any
off-the-shelf deep learning libraries. Experiments on different networks and
tasks show that our method outperforms existing techniques before fine-tuning,
and achieves the state-of-the-art results after fine-tuning.
|
cs.CV
|
while the research on convolutional neural networks cnns is progressing quickly the realworld deployment of these models is often limited by computing resources and memory constraints in this paper we address this issue by proposing a novel filter pruning method to compress and accelerate cnns our work is based on the linear relationship identified in different feature map subspaces via visualization of feature maps such linear relationship implies that the information in cnns is redundant our method eliminates the redundancy in convolutional filters by applying subspace clustering to feature maps in this way most of the representative information in the network can be retained in each cluster therefore our method provides an effective solution to filter pruning for which most existing methods directly remove filters based on simple heuristics the proposed method is independent of the network structure thus it can be adopted by any offtheshelf deep learning libraries experiments on different networks and tasks show that our method outperforms existing techniques before finetuning and achieves the stateoftheart results after finetuning
|
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|
[-0.033969023581512534, -0.008572490245144003, -0.0866994903700655, 0.02159061989670739, -0.10606536876453816, -0.17915207397312535, 0.03000344334739364, 0.46663935597964196, -0.310983877099386, -0.30825071181688046, 0.09553975732357116, -0.2394489951606034, -0.23732397176069345, 0.19789442657465822, -0.1152931224930574, 0.08918491573541354, 0.14345927457243465, -0.009817004330423578, -0.08200881668715057, -0.3158577428449882, 0.3222454333057006, 0.0871003662596514, 0.36040752064109893, 0.021978483016586357, 0.12419575897974033, -0.04100630090610064, -0.08156971299506136, -0.003977492395842894, -0.03253812122620623, 0.18942116558475539, 0.3059575553197859, 0.22961520812536654, 0.33092697045482605, -0.42397356306731004, -0.26363850817389306, 0.09661485445930769, 0.18109906144570886, 0.1287145422729364, -0.013545900700363324, -0.3094936787689987, 0.115581321882694, -0.1445721498273901, 0.012167412479958164, -0.1619388059391613, -0.0599250672820803, -0.010683426206961427, -0.27236156301724057, 0.027149086668835518, 0.08062513031838843, 0.018195268719821994, -0.01857781394695242, -0.11380449803110365, 0.024026695747821653, 0.11702701561316325, -0.004334220715814777, 0.05534267951516511, 0.14859151244381366, -0.16180263478744622, -0.1388318318960785, 0.3185545809468941, -0.055915683349975716, -0.2298821052481905, 0.1883689259908745, 0.02375126084073158, -0.1809469031044745, 0.10838469078666285, 0.19954290353708046, 0.116876812842375, -0.18313865774012938, 0.03959006420881297, -0.026911126879964307, 0.1920761579064903, 0.043432788205828674, 0.00821752094375024, 0.16741137392274294, 0.26235779821437005, 0.0837578512435474, 0.12997097079301723, -0.12006537551713879, -0.049981675982170286, -0.1860135545768933, -0.08509302618014708, -0.2306533374725596, -0.067411281928224, -0.13023623482328267, -0.11124942719538788, 0.4122621819529443, 0.25791929867554303, 0.21189750927603906, 0.08595962283318612, 0.37806112341016357, 0.05371375824460945, 0.19595658488582537, 0.12624293841198306, 0.20331390083757941, 0.024518750132775012, 0.10500368448580229, -0.16797064706936413, 0.07284955365027775, 0.08987588931436034]
|
1,803.0573
|
Analysis of the $\tilde{A}-\tilde{X}$ bands of the Ethynyl Radical near
1.48$\mu$m and Re-evaluation of $\tilde{X}$ State Energies
|
We report the observation and analysis of spectra in part of the
near-infrared spectrum of C$_2$H, originating in rotational levels in the
ground and lowest two excited bending vibrational levels of the ground
$\tilde{X}\,^2\Sigma^+$ state. In the analysis, we have combined present and
previously reported high resolution spectroscopic data for the lower levels
involved in the transitions to determine significantly improved molecular
constants to describe the fine and hyperfine split rotational levels of the
radical in the zero point, $v_2=1$ and the $^2\Sigma^+$ component of $v_2=2$.
Two of the upper state vibronic levels involved had not been observed
previously. The data and analysis indicate the electronic wavefunction
character changes with bending vibrational excitation in the ground state and
provide avenues for future measurements of reactivity of the radical as a
function of vibrational excitation.
|
physics.chem-ph
|
we report the observation and analysis of spectra in part of the nearinfrared spectrum of c_2h originating in rotational levels in the ground and lowest two excited bending vibrational levels of the ground tildex2sigma state in the analysis we have combined present and previously reported high resolution spectroscopic data for the lower levels involved in the transitions to determine significantly improved molecular constants to describe the fine and hyperfine split rotational levels of the radical in the zero point v_21 and the 2sigma component of v_22 two of the upper state vibronic levels involved had not been observed previously the data and analysis indicate the electronic wavefunction character changes with bending vibrational excitation in the ground state and provide avenues for future measurements of reactivity of the radical as a function of vibrational excitation
|
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|
[-0.11930626943791495, 0.13703736865059718, -0.053157237095800336, 0.02910529080904404, 0.023368516254161757, -0.08255240346017972, 0.09710793737041995, 0.3796842132197847, -0.210220004606964, -0.32826048235279415, 0.041947883075012134, -0.2689647764051543, -0.03767940053310161, 0.12728760460097538, 0.07070197676889654, 0.015298089166556983, 0.06598806018850073, -0.0019041821165833117, -0.02291604163321225, -0.12802877873042248, 0.30437999960171636, 0.08476511854678392, 0.2863723082586955, 0.10958901781910904, 0.048110588413446134, -0.06325438147396746, 0.013443818086534179, -0.0726843299064085, -0.14781418796676854, 0.1504078030379343, 0.2742306130020914, 0.051647239782203244, 0.20335738836346487, -0.4285137408546039, -0.19008464720279603, 0.05106144332978174, 0.14160526402406676, 0.1632707790153003, 0.01588203344157988, -0.294751204973913, 0.01072241101699314, -0.1305854461835067, -0.14682619598575106, -0.11858592958791755, 0.007427838468167903, 0.004046164579073289, -0.18280728538415597, 0.12156817571897256, 0.004979391468520788, 0.14921812563272424, -0.18952300072178468, -0.22409095143185073, -0.07985848464645949, 0.14835611520653688, 0.03167556805354088, -0.004970761226083999, 0.1204924611943683, -0.12093070182683212, -0.11830692525946052, 0.3779724141988987, -0.11755654504137548, -0.10267813461027424, 0.1863431642112091, -0.2193060087292154, -0.19244470361347094, 0.20201241706771061, 0.10655610778726134, 0.08135544685506843, -0.08008963424236254, 0.02637151443737356, 0.05133822395753367, 0.19675126242564284, 0.043028907992183826, 0.11490735348709684, 0.15250573776438273, 0.1014782782307917, 0.02070214343957491, 0.13888033403038166, -0.17535789765739687, -0.043891324016136025, -0.2370260866407893, -0.15411000906995714, -0.17641260876334308, 0.04499958822938274, -0.004916505327144519, -0.1116992400265894, 0.4545635683251951, 0.08408680988853812, 0.21633349969646984, -0.03572952266803529, 0.2716395853479442, 0.13025455136741407, 0.03628434374564348, 0.011450418398043323, 0.31910006626320064, 0.1381495201004375, 0.05481059837358115, -0.3084840264969638, 0.050305764887593966, -0.014896933643210371]
|
1,803.05731
|
The Effects of Subsurface Chemistry in the Grain Mantles on the
Deuterium Chemistry in Molecular Clouds
|
The deuterium enrichment in molecules in dark molecular cloud cores and
starforming regions is usually attributed to gas-phase chemistry. Here we
examine the effects of surface and mantle chemical reactions on the deuteration
of species. We use a simple kinetic chemistry model that includes gas, surface
and mantle pore phase reactions of deuterated species. The mantle is assumed to
be partially reactive due to pores with sufficient surface area for chemical
reactions, that are continuously transformed by cosmic-rays. Calculation
results show that surface reactions generally enhance the deuteration for at
least several molecules. However, once they are buried and become mantle
molecules, they lose their deuteration over a timescale of 10 million years due
to processes in the mantle. If deuterated species in young star-forming regions
come from grain mantles, a cautious conclusion is that the freeze-out of
molecules, perhaps, should not occur more than 10 Myr before the mantle
evaporates to the gas phase.
|
astro-ph.GA
|
the deuterium enrichment in molecules in dark molecular cloud cores and starforming regions is usually attributed to gasphase chemistry here we examine the effects of surface and mantle chemical reactions on the deuteration of species we use a simple kinetic chemistry model that includes gas surface and mantle pore phase reactions of deuterated species the mantle is assumed to be partially reactive due to pores with sufficient surface area for chemical reactions that are continuously transformed by cosmicrays calculation results show that surface reactions generally enhance the deuteration for at least several molecules however once they are buried and become mantle molecules they lose their deuteration over a timescale of 10 million years due to processes in the mantle if deuterated species in young starforming regions come from grain mantles a cautious conclusion is that the freezeout of molecules perhaps should not occur more than 10 myr before the mantle evaporates to the gas phase
|
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|
[-0.01802563006471422, 0.24219975382870723, -0.04446532258223141, 0.0574498685970602, 0.00474423265024539, -0.06271654876670049, 0.08764162964878544, 0.4029212492848596, -0.23769266994730118, -0.27816151344487744, 0.04008834507436521, -0.26173606195877636, -0.04023656794020245, 0.11112590872442289, -0.0047613817627631845, -0.06280098651055127, 0.08271518858194711, -0.09168251668733936, 0.008558192440579015, -0.275758723043386, 0.29282929569843313, 0.0889422302314591, 0.12426877875301627, 0.1478198353020895, 0.022551966343645848, -0.22587420437785408, 0.01026302941834494, -0.06995962607944685, -0.1563763781550205, 0.0741061309307453, 0.2984965052335493, 0.07832403878471063, 0.17090343603593927, -0.5625201741413725, -0.321691977665309, 0.11254372583822378, 0.14024071176085742, 0.11004366017577628, -0.040343490657265176, -0.2056171961594373, 0.008634823638825647, -0.15976124931907942, -0.11909072016095443, 0.0003180064095724975, 0.06830370235407064, -0.02569226106650369, -0.20690523480410658, 0.13263228848095862, 0.019635824322880756, 0.1095568653136011, -0.11248642293015315, -0.2017179443050296, -0.13161000097470898, 0.0570458025551371, 0.0024098808974808744, 0.008300376129186441, 0.3499189175244781, -0.12882049940526485, 0.05537325735354135, 0.4568165091136771, -0.06290536957329154, -0.08553270198885471, 0.32254900812141357, -0.21370351397762857, -0.17693986938965897, 0.27267772485652275, 0.1593966464872562, 0.1221700016469244, -0.18357265084801663, -0.027315371181635607, 0.005667903721182337, 0.19144037663936614, 0.1341710499878372, 0.0077040431714023375, 0.2911351651283762, 0.18704403924094815, 0.03970072537720684, 0.08514281262929041, -0.11915182978846132, -0.11547784107106347, -0.1711470072788577, -0.22778065172174283, -0.11823526313678633, 0.03251728632857257, -0.05495670109108511, -0.10087761990725994, 0.23994095768449047, 0.08890069734958571, 0.1764905165400236, -0.011087572941135975, 0.28494257733541273, -0.0029390070305746648, 0.1123998006009647, 0.08141546604193507, 0.23732028499005303, 0.20223462719107874, 0.10005465080330689, -0.22275092419980455, 0.21983615631357797, -0.007044498433148669]
|
1,803.05732
|
Divergence free quantum field theory using a spectral calculus of
Lorentz invariant measures
|
This paper presents a spectral calculus for computing the spectrum of a
causal Lorentz invariant Borel complex measure on Minkowski space, thereby
enabling one to compute the density for such a measure with respect to Lebesque
measure. It is proved that the convolution of arbitrary causal Lorentz
invariant Borel measures exists and the product of such measures exists in a
wide class of cases. Techniques for their computation are presented. Divergent
integrals in quantum field theory (QFT) are shown to have a well defined
existence as Lorentz covariant measures. The case of vacuum polarization is
considered and the spectral vacuum polarization function is shown to have very
close agreement with the vacuum polarization function obtained using
dimensional regularization / renormalization in the timelike domain. Using the
spectral vacuum polarization function the exact Uehling potential function is
derived. The spectral running coupling constant is computed and is shown to
converge for all energies while the integral defining the running coupling
constant obtained using dimensional regularization / renormalization is shown
to diverge for all non-zero energies.
|
physics.gen-ph hep-th
|
this paper presents a spectral calculus for computing the spectrum of a causal lorentz invariant borel complex measure on minkowski space thereby enabling one to compute the density for such a measure with respect to lebesque measure it is proved that the convolution of arbitrary causal lorentz invariant borel measures exists and the product of such measures exists in a wide class of cases techniques for their computation are presented divergent integrals in quantum field theory qft are shown to have a well defined existence as lorentz covariant measures the case of vacuum polarization is considered and the spectral vacuum polarization function is shown to have very close agreement with the vacuum polarization function obtained using dimensional regularization renormalization in the timelike domain using the spectral vacuum polarization function the exact uehling potential function is derived the spectral running coupling constant is computed and is shown to converge for all energies while the integral defining the running coupling constant obtained using dimensional regularization renormalization is shown to diverge for all nonzero energies
|
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|
[-0.1354091557251766, 0.11649158755912943, -0.10052135079925836, 0.10247702744307516, -0.052963743917644024, -0.1262529495166788, -0.03142000894132612, 0.3906648943937102, -0.23823430325002085, -0.24404137683822502, 0.06616553498721725, -0.24421831743986627, -0.10658836584987638, 0.1913692227694704, -0.020974292985514228, 0.11551474350190527, 0.013311250236827533, 0.0651126437046197, -0.11767962711273021, -0.18813685568179503, 0.3633440425213383, 0.042682674103606016, 0.2873474648763794, 0.0847491261273146, 0.14161882965370667, 0.013861096816050798, -0.061952695130034846, 0.04925665795336013, -0.13252834512651282, 0.09745475004946944, 0.24887948829361217, 0.09193076872873272, 0.2367131988664136, -0.3209556476700358, -0.21450156231714024, 0.13367208678459444, 0.09250107132504846, 0.06650796420411965, -0.016606680644123795, -0.2774709239480259, 0.06308121349781665, -0.14250772729039538, -0.16928632378166672, -0.15333806723356247, 0.02600624147859445, -0.04039175050139568, -0.2937432337270746, 0.05725614944889838, -0.041465677109108375, 0.024372114710574752, -0.06925144950794272, -0.10185747448798962, -0.01364545299547053, 0.10426141308393157, 0.08863398885533083, 0.1079093698123849, 0.11057186190602045, -0.09418444359259813, -0.10800239506318386, 0.37630912111963816, -0.11009271176285544, -0.25661684427786685, 0.1439718853676865, -0.18913590455113716, -0.10673415945940326, 0.11662147251813304, 0.0857025233184009, 0.1262561130922201, -0.12356080748357398, 0.18628177296290402, -0.007430982930981013, 0.0934433555062982, 0.11304991948959786, 0.08231608322945926, 0.1491768425438813, 0.06350921067614974, 0.09821826036475317, 0.12554055349468146, -0.02320283704821757, -0.11649424194217507, -0.34739736784899305, -0.15645699902792287, -0.2254652451130908, 0.09650930625570635, -0.12268496557048503, -0.22032147977530936, 0.3752075460344163, 0.074327558013042, 0.1724717618659312, 0.09497957906027887, 0.26062384436616326, 0.21086752819991128, 0.09747254706412922, 0.0791282080408987, 0.2550415384974385, 0.17489842500884173, 0.059956029978672824, -0.21607838998356466, 0.007738323679172196, 0.09601479150262814]
|
1,803.05733
|
Nodal-to-nodeless superconducting order parameter in
LaFeAs$_{1-x}$P$_x$O synthesized under high pressure
|
Similar to chemical doping, pressure produces and stabilizes new phases of
known materials, whose properties may differ greatly from those of their
standard counterparts. Here, by considering a series of LaFeAs$_{1-x}$P$_x$O
iron-pnictides synthesized under high-pressure high-temperature conditions, we
investigate the simultaneous effects of pressure and isoelectronic doping in
the 1111 family. Results of numerous macro- and microscopic technique
measurements, unambiguously show a radically different phase diagram for the
pressure-grown materials, characterized by the lack of magnetic order and the
persistence of superconductivity across the whole $0.3 \leq x \leq 0.7$ doping
range. This unexpected scenario is accompanied by a branching in the electronic
properties across $x = 0.5$, involving both the normal and superconducting
phases. Most notably, the superconducting order parameter evolves from nodal
(for $x < 0.5$) to nodeless (for $x \geq 0.5$), in clear contrast to other 1111
and 122 iron-based materials grown under ambient-pressure conditions.
|
cond-mat.supr-con
|
similar to chemical doping pressure produces and stabilizes new phases of known materials whose properties may differ greatly from those of their standard counterparts here by considering a series of lafeas_1xp_xo ironpnictides synthesized under highpressure hightemperature conditions we investigate the simultaneous effects of pressure and isoelectronic doping in the 1111 family results of numerous macro and microscopic technique measurements unambiguously show a radically different phase diagram for the pressuregrown materials characterized by the lack of magnetic order and the persistence of superconductivity across the whole 03 leq x leq 07 doping range this unexpected scenario is accompanied by a branching in the electronic properties across x 05 involving both the normal and superconducting phases most notably the superconducting order parameter evolves from nodal for x 05 to nodeless for x geq 05 in clear contrast to other 1111 and 122 ironbased materials grown under ambientpressure conditions
|
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|
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|
1,803.05734
|
Modified Kelvin equations for capillary condensation in narrow and wide
grooves
|
We consider the location and order of capillary condensation transitions
occurring in deep grooves of width $L$ and depth $D$. For walls that are
completely wet by liquid (contact angle $\theta=0$) the transition is
continuous and its location is not sensitive to the depth of the groove.
However for walls which are partially wet by liquid, where the transition is
first-order, we show that the pressure at which it occurs is determined by a
modified Kelvin equation characterized by an edge contact angle $\theta_E$
describing the shape of the meniscus formed at the top of the groove. The
dependence of $\theta_E$ on the groove depth $D$ relies, in turn, on whether
corner menisci are formed at the bottom of the groove in the low density
gas-like phase. While for macroscopically wide grooves these are always present
when $\theta<45\degree$ we argue that their formation is inhibited in narrow
grooves. This has a number of implications including that the local pining of
the meniscus and location of the condensation transition is different depending
on whether the contact angle is greater or less than a universal value
$\theta^*\approx 31\degree$. Our arguments are supported by detailed
microscopic density functional theory calculations which show that the modified
Kelvin equation remains highly accurate even when $L$ and $D$ are of the order
of tens of molecular diameters.
|
cond-mat.stat-mech cond-mat.mes-hall physics.chem-ph
|
we consider the location and order of capillary condensation transitions occurring in deep grooves of width l and depth d for walls that are completely wet by liquid contact angle theta0 the transition is continuous and its location is not sensitive to the depth of the groove however for walls which are partially wet by liquid where the transition is firstorder we show that the pressure at which it occurs is determined by a modified kelvin equation characterized by an edge contact angle theta_e describing the shape of the meniscus formed at the top of the groove the dependence of theta_e on the groove depth d relies in turn on whether corner menisci are formed at the bottom of the groove in the low density gaslike phase while for macroscopically wide grooves these are always present when theta45degree we argue that their formation is inhibited in narrow grooves this has a number of implications including that the local pining of the meniscus and location of the condensation transition is different depending on whether the contact angle is greater or less than a universal value thetaapprox 31degree our arguments are supported by detailed microscopic density functional theory calculations which show that the modified kelvin equation remains highly accurate even when l and d are of the order of tens of molecular diameters
|
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|
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|
1,803.05735
|
Comparing comparisons between vehicular traffic states in microscopic
and macroscopic first-order models
|
In this paper we deal with the analysis of the solutions of traffic flow
models at multiple scales, both in the case of a single road and of road
networks. We are especially interested in measuring the distance between
traffic states (as they result from the mathematical modeling) and
investigating whether these distances are somehow preserved passing from the
microscopic to the macroscopic scale. By means of both theoretical and
numerical investigations, we show that, on a single road, the notion of
Wasserstein distance fully catches the human perception of distance
independently of the scale, while in the case of networks it partially loses
its nice properties.
|
math.OC
|
in this paper we deal with the analysis of the solutions of traffic flow models at multiple scales both in the case of a single road and of road networks we are especially interested in measuring the distance between traffic states as they result from the mathematical modeling and investigating whether these distances are somehow preserved passing from the microscopic to the macroscopic scale by means of both theoretical and numerical investigations we show that on a single road the notion of wasserstein distance fully catches the human perception of distance independently of the scale while in the case of networks it partially loses its nice properties
|
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|
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|
1,803.05736
|
Spectral Picture For Rationally Multicyclic Subnormal Operators
|
For a pure bounded rationally cyclic subnormal operator $S$ on a separable
complex Hilbert space $\mathcal H,$ J. B. Conway and N. Elias (Analytic bounded
point evaluations for spaces of rational functions, J. Functional Analysis,
117:1{24, 1993) showed that $clos(\sigma (S) \setminus \sigma_e (S)) = clos(Int
(\sigma (S))).$ This paper examines the property for rationally multicyclic
(N-cyclic) subnormal operators. We show: (1) There exists a 2-cyclic
irreducible subnormal operator $S$ with $clos(\sigma (S) \setminus \sigma_e
(S)) \neq clos(Int (\sigma (S))).$ (2) For a pure rationally $N-$cyclic
subnormal operator $S$ on $\mathcal H$ with the minimal normal extension $M$ on
$\mathcal K \supset \mathcal H,$ let $\mathcal K_m = clos (span\{(M^*)^kx:
~x\in\mathcal H,~0\le k \le m\}.$ Suppose $M |_{\mathcal K_{N-1}}$ is pure,
then $clos(\sigma (S) \setminus \sigma_e (S)) = clos(Int (\sigma (S))).$
|
math.FA
|
for a pure bounded rationally cyclic subnormal operator s on a separable complex hilbert space mathcal h j b conway and n elias analytic bounded point evaluations for spaces of rational functions j functional analysis 117124 1993 showed that clossigma s setminus sigma_e s closint sigma s this paper examines the property for rationally multicyclic ncyclic subnormal operators we show 1 there exists a 2cyclic irreducible subnormal operator s with clossigma s setminus sigma_e s neq closint sigma s 2 for a pure rationally ncyclic subnormal operator s on mathcal h with the minimal normal extension m on mathcal k supset mathcal h let mathcal k_m clos spanmkx xinmathcal h0le k le m suppose m _mathcal k_n1 is pure then clossigma s setminus sigma_e s closint sigma s
|
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|
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|
1,803.05737
|
Blowup criteria for geometric flows on surfaces
|
Utilizing a splitting of geometric flows on surfaces introduced by Buzano and
Rupflin, we present a general scheme to prove blow up criteria for such
geometric flows. A vital ingredient is a new compactness theorem for families
of metrics on surfaces with a uniform bound on their volumes, square integrals
of their curvatures and injectivity radii. In particular we prove blow up
criteria for the harmonic Ricci flow and for the spinor flow on surfaces.
|
math.DG
|
utilizing a splitting of geometric flows on surfaces introduced by buzano and rupflin we present a general scheme to prove blow up criteria for such geometric flows a vital ingredient is a new compactness theorem for families of metrics on surfaces with a uniform bound on their volumes square integrals of their curvatures and injectivity radii in particular we prove blow up criteria for the harmonic ricci flow and for the spinor flow on surfaces
|
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|
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|
1,803.05738
|
Pure glueball states in a Light-Front holographic approach
|
A phenomenological analysis of the scalar glueball and scalar meson spectra
is carried out by using the AdS/QCD framework in the bottom-up approach. The
resulting spectra are in good agreement for glueballs with lattice QCD results
and for mesons with PDG data. We make use of the relation between the mode
functions in AdS/QCD and the wave functions in Light-Front $QCD$ to discuss the
mixing of glueballs and mesons. The results of our investigation point out that
above 2 GeV scalar particles will appear in almost degenerate pairs of unmixed
glueball and mesons states leading to an interesting phenomenology whereby
gluon dynamics could be well investigated.
|
hep-ph
|
a phenomenological analysis of the scalar glueball and scalar meson spectra is carried out by using the adsqcd framework in the bottomup approach the resulting spectra are in good agreement for glueballs with lattice qcd results and for mesons with pdg data we make use of the relation between the mode functions in adsqcd and the wave functions in lightfront qcd to discuss the mixing of glueballs and mesons the results of our investigation point out that above 2 gev scalar particles will appear in almost degenerate pairs of unmixed glueball and mesons states leading to an interesting phenomenology whereby gluon dynamics could be well investigated
|
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|
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|
1,803.05739
|
Spectroscopic and photometric observations of Symbiotic Nova PU Vul
during 2009-2016
|
A new set of low-resolution spectral and UBVJHKL-photometric observations of
the symbiotic nova PU Vul is presented. The binary has been still evolving
after the symbiotic nova outburst in 1977 and now it's in the nebular stage. It
is found that the third orbital cycle (after 1977) was characterized by great
changes in light curves. Now PU Vul demonstrates a sine-wave shape of all light
curves (with an amplitude in the U band of about 0.7 mag), which is typical for
symbiotic stars in quiescent state. Brightness variability due to cool
component pulsations is now clearly visible in the VRI light curves. The
amplitude of the pulsations increases from 0.5 mag in V band to 0.8 mag in I
band. These two types of variability, as well as a very slow change of the hot
component physical parameters due to evolution after the outburst of 1979,
influence the spectral energy distribution of the system. The emission lines
variability is highly complex. Only hydrogen lines fluxes vary with orbital
phase. An important feature of the third orbital cycle is the first appearance
of the OVI, 6828A Raman scattering line. We determined the hot component
temperature by means of Zanstra method applied to the He II, 4686 line. Our
estimate is about 150000 K for the spectrum obtained near orbital maximum in
2014. The VO spectral index derived near pulsation minimum corresponds to M6
spectral class for the cool component of PU Vul.
|
astro-ph.SR
|
a new set of lowresolution spectral and ubvjhklphotometric observations of the symbiotic nova pu vul is presented the binary has been still evolving after the symbiotic nova outburst in 1977 and now its in the nebular stage it is found that the third orbital cycle after 1977 was characterized by great changes in light curves now pu vul demonstrates a sinewave shape of all light curves with an amplitude in the u band of about 07 mag which is typical for symbiotic stars in quiescent state brightness variability due to cool component pulsations is now clearly visible in the vri light curves the amplitude of the pulsations increases from 05 mag in v band to 08 mag in i band these two types of variability as well as a very slow change of the hot component physical parameters due to evolution after the outburst of 1979 influence the spectral energy distribution of the system the emission lines variability is highly complex only hydrogen lines fluxes vary with orbital phase an important feature of the third orbital cycle is the first appearance of the ovi 6828a raman scattering line we determined the hot component temperature by means of zanstra method applied to the he ii 4686 line our estimate is about 150000 k for the spectrum obtained near orbital maximum in 2014 the vo spectral index derived near pulsation minimum corresponds to m6 spectral class for the cool component of pu vul
|
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|
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|
1,803.0574
|
Using a monomer potential energy surface to perform approximate path
integral molecular dynamics simulation of ab-initio water with near-zero
added cost
|
It is now established that nuclear quantum motion plays an important role in
determining water's hydrogen bonding, structure, and dynamics. Such effects are
important to include in density functional theory (DFT) based molecular
dynamics simulation of water. The standard way of treating nuclear quantum
effects, path integral molecular dynamics (PIMD), multiplies the number of
energy/force calculations by the number of beads required. In this work we
introduce a method whereby PIMD can be incorporated into a DFT simulation with
little extra cost and little loss in accuracy. The method is based on the many
body expansion of the energy and has the benefit of including a monomer level
correction to the DFT energy. Our method calculates intramolecular forces using
the highly accurate monomer potential energy surface developed by
Partridge-Schwenke, which is cheap to evaluate. Intermolecular forces and
energies are calculated with DFT only once per timestep using the centroid
positions. We show how our method may be used in conjunction with a multiple
time step algorithm for an additional speedup and how it relates to ring
polymer contraction and other schemes that have been introduced recently to
speed up PIMD simulations. We show that our method, which we call "monomer
PIMD", correctly captures changes in the structure of water found in a full
PIMD simulation but at much lower computational cost.
|
physics.chem-ph cond-mat.soft physics.comp-ph
|
it is now established that nuclear quantum motion plays an important role in determining waters hydrogen bonding structure and dynamics such effects are important to include in density functional theory dft based molecular dynamics simulation of water the standard way of treating nuclear quantum effects path integral molecular dynamics pimd multiplies the number of energyforce calculations by the number of beads required in this work we introduce a method whereby pimd can be incorporated into a dft simulation with little extra cost and little loss in accuracy the method is based on the many body expansion of the energy and has the benefit of including a monomer level correction to the dft energy our method calculates intramolecular forces using the highly accurate monomer potential energy surface developed by partridgeschwenke which is cheap to evaluate intermolecular forces and energies are calculated with dft only once per timestep using the centroid positions we show how our method may be used in conjunction with a multiple time step algorithm for an additional speedup and how it relates to ring polymer contraction and other schemes that have been introduced recently to speed up pimd simulations we show that our method which we call monomer pimd correctly captures changes in the structure of water found in a full pimd simulation but at much lower computational cost
|
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|
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|
1,803.05741
|
Why We Engage in FLOSS: Answers from Core Developers
|
The maintenance and evolution of Free/Libre Open Source Software (FLOSS)
projects demand the constant attraction of core developers. In this paper, we
report the results of a survey with 52 developers, who recently became core
contributors of popular GitHub projects. We reveal their motivations to assume
a key role in FLOSS projects (e.g., improving the projects because they are
also using it), the project characteristics that most helped in their
engagement process (e.g., a friendly community), and the barriers faced by the
surveyed core developers (e.g., lack of time of the project leaders). We also
compare our results with related studies about others kinds of open source
contributors (casual, one-time, and newcomers).
|
cs.SE
|
the maintenance and evolution of freelibre open source software floss projects demand the constant attraction of core developers in this paper we report the results of a survey with 52 developers who recently became core contributors of popular github projects we reveal their motivations to assume a key role in floss projects eg improving the projects because they are also using it the project characteristics that most helped in their engagement process eg a friendly community and the barriers faced by the surveyed core developers eg lack of time of the project leaders we also compare our results with related studies about others kinds of open source contributors casual onetime and newcomers
|
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|
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|
1,803.05742
|
On the piecewise pseudo almost periodic solution of nondensely impulsive
integro-differential systems with infinite delay
|
In the theory of neutral differential equations with pulse influence (neutral
impulsive differential equations), there are many unsolved problems related to
certain results in the theory of integral and integro-differential equations.
In this article, we present an result for the existence of the piecewise pseudo
almost periodic solution of a class of neutral impulsive nonlinear
integro-differential systems with infinite delay. The method used involves
result on the theory of integrated semigroup as well as the Sadovskii's fixed
point theorem.
|
math.FA
|
in the theory of neutral differential equations with pulse influence neutral impulsive differential equations there are many unsolved problems related to certain results in the theory of integral and integrodifferential equations in this article we present an result for the existence of the piecewise pseudo almost periodic solution of a class of neutral impulsive nonlinear integrodifferential systems with infinite delay the method used involves result on the theory of integrated semigroup as well as the sadovskiis fixed point theorem
|
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|
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|
1,803.05743
|
An equivariant Iwasawa main conjecture for local fields
|
Let $L/K$ be a finite Galois extension of $p$-adic fields and let
$L_{\infty}$ be the unramified $\mathbb Z_p$-extension of $L$. Then
$L_{\infty}/K$ is a one-dimensional $p$-adic Lie extension. In the spirit of
the main conjectures of equivariant Iwasawa theory, we formulate a conjecture
which relates the equivariant local epsilon constants attached to the finite
Galois intermediate extensions $M/K$ of $L_{\infty}/K$ to a natural arithmetic
invariant arising from the \'etale cohomology of the constant sheaf $\mathbb
Q_p/\mathbb Z_p$ on the spectrum of $L_{\infty}$. We give strong evidence of
the conjecture including a full proof in the case that $L/K$ is at most tamely
ramified.
|
math.NT
|
let lk be a finite galois extension of padic fields and let l_infty be the unramified mathbb z_pextension of l then l_inftyk is a onedimensional padic lie extension in the spirit of the main conjectures of equivariant iwasawa theory we formulate a conjecture which relates the equivariant local epsilon constants attached to the finite galois intermediate extensions mk of l_inftyk to a natural arithmetic invariant arising from the etale cohomology of the constant sheaf mathbb q_pmathbb z_p on the spectrum of l_infty we give strong evidence of the conjecture including a full proof in the case that lk is at most tamely ramified
|
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|
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|
1,803.05744
|
First search for invisible decays of ortho-positronium confined in a
vacuum cavity
|
The experimental setup and results of the first search for invisible decays
of ortho-positronium (o-Ps) confined in a vacuum cavity are reported. No
evidence of invisible decays at a level
$\text{Br}\left(\text{o-Ps}\to\text{invisible}\right) < 5.9\times 10^{-4}$ (90%
C. L.) was found. This decay channel is predicted in Hidden Sector models such
as the Mirror Matter (MM), which could be a candidate for Dark Matter. Analyzed
within the MM context, this result provides an upper limit on the kinetic
mixing strength between ordinary and mirror photons of $\epsilon < 3.1 \times
10^{-7}$ (90% C. L.). This limit was obtained for the first time in vacuum free
of systematic effects due to collisions with matter.
|
hep-ex physics.ins-det
|
the experimental setup and results of the first search for invisible decays of orthopositronium ops confined in a vacuum cavity are reported no evidence of invisible decays at a level textbrlefttextopstotextinvisibleright 59times 104 90 c l was found this decay channel is predicted in hidden sector models such as the mirror matter mm which could be a candidate for dark matter analyzed within the mm context this result provides an upper limit on the kinetic mixing strength between ordinary and mirror photons of epsilon 31 times 107 90 c l this limit was obtained for the first time in vacuum free of systematic effects due to collisions with matter
|
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|
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|
1,803.05745
|
Positrons at JLab - Advancing Nuclear Science in Hall B
|
In this talk I address two high impact physics programs that require the use
of polarized and unpolarized positron beams in addition to using electron beams
of the same energy. First, I address what will be gained from using positron
beams in addition to electron beams in the extraction of the Compton Form
Factors (CFFs) and generalized parton distributions (GPDs) from Deeply Virtual
Compton Scattering (DVCS) on a proton target. As a second high impact science
program I discuss an experimental scenario using unpolarized positrons to
measure elastic scattering on protons in an effort to determine definitively
the 2-photon exchange contributions in order to resolve a longstanding
discrepancy in the determination of the proton's electric and magnetic form
factors.
|
nucl-ex hep-ex nucl-th
|
in this talk i address two high impact physics programs that require the use of polarized and unpolarized positron beams in addition to using electron beams of the same energy first i address what will be gained from using positron beams in addition to electron beams in the extraction of the compton form factors cffs and generalized parton distributions gpds from deeply virtual compton scattering dvcs on a proton target as a second high impact science program i discuss an experimental scenario using unpolarized positrons to measure elastic scattering on protons in an effort to determine definitively the 2photon exchange contributions in order to resolve a longstanding discrepancy in the determination of the protons electric and magnetic form factors
|
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|
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|
1,803.05746
|
Notes on linkage of modules
|
Let R be a Cohen-Macaulay local ring. It is shown that under some mild
conditions, the Cohen-Macaulayness property is preserved under linkage. We also
study the connection of (S_n) locus of a horizontally linked module and the
attached primes of certain local cohomology modules of its linked module.
|
math.AC
|
let r be a cohenmacaulay local ring it is shown that under some mild conditions the cohenmacaulayness property is preserved under linkage we also study the connection of s_n locus of a horizontally linked module and the attached primes of certain local cohomology modules of its linked module
|
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|
[-0.2796468205803346, 0.023776877613272518, -0.15502482732214654, 0.04926316287310328, -0.038074793522052154, -0.20713857969773622, -0.06298453574224065, 0.35504355227264267, -0.4419868402183056, -0.10170903167454526, 0.14886866360514736, -0.16706178321813545, -0.1605593719674895, 0.16458879240478078, -0.1690450142680978, -0.06925887261483392, 0.10935972972462575, 0.14287507975435196, -0.03257111178148383, -0.349954253489462, 0.4052646273436646, 0.07767710935634871, 0.2774220163943634, 0.044824694591322135, 0.12242119477984185, -0.029993471398483962, 0.0016753309755586088, 0.044907146070424155, -0.17931986265057276, 0.09223663127825905, 0.24595149618107826, 0.09804419800639153, 0.22381851436027014, -0.4072257809457369, -0.018006153710302897, 0.2480774664436467, 0.0755955874628853, -0.0963117333012633, -0.006522340457498406, -0.2396108399455746, 0.1976230376943325, -0.1813954021296619, -0.19061379363605133, -0.06322112776494275, 0.03739404054552627, 0.061409375703078695, -0.2824465715045032, -0.015482188673558994, 0.10241336546217401, 0.1887650322751142, -0.05488293446493723, -0.029606146907705504, -0.11797824412739526, 0.055092302801009886, -0.012480001324244464, 0.0015249185574551423, 0.16103600296385898, -0.10955171726527624, -0.043007099566845376, 0.36195822242492187, -0.02760502804691593, -0.21238592725906832, 0.17825722772977315, -0.19892479999301335, -0.13823577263004458, 0.11076240474358201, -0.030196197253341477, 0.14296337975732362, -0.09142650983994827, 0.1825736119050513, -0.19753077057733512, 0.05874014207317183, 0.1276446851940515, 0.02467875955820394, 0.18881603768871477, 0.09176727842714172, 0.12032454068988348, 0.16809203822776908, -0.009361285289439062, 0.03817607080175852, -0.3638219277878913, -0.19403259650183222, -0.12004671414615586, 0.10798645209676276, -0.10730369399698247, -0.14015284192464605, 0.4498572427934657, 0.09393467803602107, 0.18193195516323613, 0.09513705955275024, 0.14620348908162364, 0.008851228631101549, 0.129935529344948, 0.039474582008551806, 0.041363101639944944, 0.3008867826623221, -0.05089397996198386, -0.15190769993932918, 0.07911833412557219, 0.14154197019524872]
|
1,803.05747
|
Joint Rate Allocation with Both Look-ahead And Feedback Model For High
Efficiency Video Coding
|
The objective of joint rate allocation among multiple coded video streams is
to share the bandwidth to meet the demands of minimum average distortion
(minAVE) or minimum distortion variance (minVAR). In previous works on minVAR
problems, bits are directly assigned in proportion to their complexity measures
and we call it look-ahead allocation model (LAM), which leads to the fact that
the performance will totally depend on the accuracy of the complexity measures.
This paper proposes a look-ahead and feedback allocation model (LFAM) for joint
rate allocation for High Efficiency Video Coding (HEVC) platform which requires
negligible computational cost. We derive the model from the target function of
minVAR theoretically. The bits are assigned according to the complexity
measures, the distortion and bitrate values fed back by the encoder together.
We integrated the proposed allocation model in HEVC reference software HM16.0
and several complexity measures were applied to our allocation model. Results
demonstrate that our proposed LFAM performs better than LAM, and an average of
65.94% variance of mean square error (MSE) is saved with different complexity
measures.
|
cs.MM
|
the objective of joint rate allocation among multiple coded video streams is to share the bandwidth to meet the demands of minimum average distortion minave or minimum distortion variance minvar in previous works on minvar problems bits are directly assigned in proportion to their complexity measures and we call it lookahead allocation model lam which leads to the fact that the performance will totally depend on the accuracy of the complexity measures this paper proposes a lookahead and feedback allocation model lfam for joint rate allocation for high efficiency video coding hevc platform which requires negligible computational cost we derive the model from the target function of minvar theoretically the bits are assigned according to the complexity measures the distortion and bitrate values fed back by the encoder together we integrated the proposed allocation model in hevc reference software hm160 and several complexity measures were applied to our allocation model results demonstrate that our proposed lfam performs better than lam and an average of 6594 variance of mean square error mse is saved with different complexity measures
|
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|
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|
1,803.05748
|
Diverse M-Best Solutions by Dynamic Programming
|
Many computer vision pipelines involve dynamic programming primitives such as
finding a shortest path or the minimum energy solution in a tree-shaped
probabilistic graphical model. In such cases, extracting not merely the best,
but the set of M-best solutions is useful to generate a rich collection of
candidate proposals that can be used in downstream processing. In this work, we
show how M-best solutions of tree-shaped graphical models can be obtained by
dynamic programming on a special graph with M layers. The proposed multi-layer
concept is optimal for searching M-best solutions, and so flexible that it can
also approximate M-best diverse solutions. We illustrate the usefulness with
applications to object detection, panorama stitching and centerline extraction.
Note: We have observed that an assumption in section 4 of our paper is not
always fulfilled, see the attached corrigendum for details.
|
cs.CV
|
many computer vision pipelines involve dynamic programming primitives such as finding a shortest path or the minimum energy solution in a treeshaped probabilistic graphical model in such cases extracting not merely the best but the set of mbest solutions is useful to generate a rich collection of candidate proposals that can be used in downstream processing in this work we show how mbest solutions of treeshaped graphical models can be obtained by dynamic programming on a special graph with m layers the proposed multilayer concept is optimal for searching mbest solutions and so flexible that it can also approximate mbest diverse solutions we illustrate the usefulness with applications to object detection panorama stitching and centerline extraction note we have observed that an assumption in section 4 of our paper is not always fulfilled see the attached corrigendum for details
|
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|
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|
1,803.05749
|
Vector tetraquark state candidates: $Y(4260/4220)$, $Y(4360/4320)$,
$Y(4390)$ and $Y(4660/4630)$
|
In this article, we construct the $C \otimes \gamma_\mu C$ and $C\gamma_5
\otimes \gamma_5\gamma_\mu C$ type currents to interpolate the vector
tetraquark states, then carry out the operator product expansion up to the
vacuum condensates of dimension-10 in a consistent way, and obtain four QCD sum
rules. In calculations, we use the formula
$\mu=\sqrt{M^2_{Y}-(2{\mathbb{M}}_c)^2}$ to determine the optimal energy scales
of the QCD spectral densities, moreover, we take the experimental values of the
masses of the $Y(4260/4220)$, $Y(4360/4320)$, $Y(4390)$ and $Y(4660/4630)$ as
input parameters and fit the pole residues to reproduce the correlation
functions at the QCD side. The numerical results support assigning the
$Y(4660/4630)$ to be the $C \otimes \gamma_\mu C$ type vector tetraquark state
$c\bar{c}s\bar{s}$, assigning the $Y(4360/4320)$ to be $C\gamma_5 \otimes
\gamma_5\gamma_\mu C$ type vector tetraquark state $c\bar{c}q\bar{q}$, and
disfavor assigning the $Y(4260/4220)$ and $Y(4390)$ to be the pure vector
tetraquark states.
|
hep-ph
|
in this article we construct the c otimes gamma_mu c and cgamma_5 otimes gamma_5gamma_mu c type currents to interpolate the vector tetraquark states then carry out the operator product expansion up to the vacuum condensates of dimension10 in a consistent way and obtain four qcd sum rules in calculations we use the formula musqrtm2_y2mathbbm_c2 to determine the optimal energy scales of the qcd spectral densities moreover we take the experimental values of the masses of the y42604220 y43604320 y4390 and y46604630 as input parameters and fit the pole residues to reproduce the correlation functions at the qcd side the numerical results support assigning the y46604630 to be the c otimes gamma_mu c type vector tetraquark state cbarcsbars assigning the y43604320 to be cgamma_5 otimes gamma_5gamma_mu c type vector tetraquark state cbarcqbarq and disfavor assigning the y42604220 and y4390 to be the pure vector tetraquark states
|
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|
[-0.09907751679892882, 0.1669770592749389, -0.05920506609718491, 0.07688470284262186, -0.08420386266611192, -0.14109295458141444, 0.08788957709507288, 0.33760259273475496, -0.22631261985583662, -0.17408219539978798, 0.03721598495368211, -0.2621618379497955, -0.011972902578723944, 0.043399156302389136, 0.07860936770958833, 0.03554852544492451, 0.029890362764674955, 0.03907576957177641, -0.08697978161491346, -0.19393915481919397, 0.3666594301390907, -0.050386925167201654, 0.224763508150489, 0.10135887391473827, 0.037430825913189976, -0.04563726004224905, 0.013549042234629176, -0.0941659159404968, -0.13108253707785322, 0.08916656308608345, 0.21839805476306734, 0.12550990998515507, 0.1251035169698298, -0.3397036178536929, -0.10399669792800062, 0.14041201793926134, 0.13004473829641938, 0.08324192891376551, 0.08145620812243526, -0.30969225099661213, 0.13427893662541782, -0.22033789808578466, -0.1733615972418878, -0.15798530851801237, 0.011860078251313256, -0.04468328144698255, -0.3716449085926718, 0.06743292674165813, -0.06209127168657015, -0.010629890215436782, -0.10770844103788714, -0.26173559115335776, -0.07495275396259798, 0.053658800098397165, 0.000185792145413765, 0.15379992581944427, 0.11015422725577609, -0.14823607537529324, -0.14391716292922627, 0.3676264109967303, -0.09040016280757128, -0.22249683554189792, 0.09353556322183568, -0.11234739382643306, -0.12812678555053644, 0.06350883450089158, 0.10200797363548823, 0.09515295112910478, -0.06386671638440179, 0.09626849225563658, -0.05667201599335649, 0.1292267871912623, 0.06860504301595569, 0.0583571310431791, 0.20221050998088028, 0.04695113442595238, -0.024730112199482603, 0.0909207337594969, -0.03242641120163751, -0.0908424403599423, -0.3925728040504391, -0.1795565454032866, -0.13066949786962537, 0.10519411965050614, -0.05623616393173849, -0.115642500595878, 0.4031414782520438, 0.08311811031814179, 0.2616020475307132, 0.03922867598821935, 0.2235368362972108, 0.10630212858845682, 0.08855159524187067, 0.089692749299001, 0.21668815174970127, 0.2096666551154593, 0.0875133553357876, -0.265199126108833, -0.04134464698533217, 0.09145180058186415]
|
1,803.0575
|
On Eigenvalue Problems Related to the Laplacian in a Class of Doubly
Connected Domains
|
We consider two eigenvalue problems for Laplacian on some specific doubly
connected domain. In particular, we study the following two eigenvalue
problems. Let $B_1$ be an open ball in $\mathbb{R}^n$ and $B_0$ be a ball
contained in $B_1$. Let $\nu$ be the outward unit normal on $\partial B_1$.
Then the first eigenvalue of the problem \begin{align*} \begin{array}{rcll}
\Delta u &=& 0 \, &\mbox{ in } \, B_1 \setminus \bar{B}_0 , \\ u &=& 0 \,
&\mbox{ on } \, {\partial B_0}, \\ \frac{\partial u}{\partial \nu} &=& \tau \,
u \, &\mbox{ on } \, {\partial B_1}, \end{array} \end{align*} attains maximum
if and only if $B_0$ and $B_1$ are concentric. Let $D$ be a domain in a
non-compact rank-$1$ symmetric space $(\mathbb{M}, ds^2)$, geodesically
symmetric with respect to the point $ p\in \mathbb{M}$. Let $B_0$ be a ball in
$\mathbb{M}$ centered at $p$ such that $\bar{{B}_0}\subset D$ and $\nu$ be the
outward unit normal on ${\partial (D \setminus \bar{B}_0)}$. Then the first
non-zero eigenvalue of \begin{align*} \begin{array}{rcll} \Delta u &=& \mu \ u
\, &\mbox{ in } \, D \setminus \bar{B}_0, \\ \frac{\partial u}{\partial \nu}
&=& 0 \, &\mbox{ on } \, {\partial (D \setminus \bar{B}_0)}, \end{array}
\end{align*} attains maximum if and only if $D$ is a geodesic ball centered at
$p$.
|
math.DG
|
we consider two eigenvalue problems for laplacian on some specific doubly connected domain in particular we study the following two eigenvalue problems let b_1 be an open ball in mathbbrn and b_0 be a ball contained in b_1 let nu be the outward unit normal on partial b_1 then the first eigenvalue of the problem beginalign beginarrayrcll delta u 0 mbox in b_1 setminus barb_0 u 0 mbox on partial b_0 fracpartial upartial nu tau u mbox on partial b_1 endarray endalign attains maximum if and only if b_0 and b_1 are concentric let d be a domain in a noncompact rank1 symmetric space mathbbm ds2 geodesically symmetric with respect to the point pin mathbbm let b_0 be a ball in mathbbm centered at p such that barb_0subset d and nu be the outward unit normal on partial d setminus barb_0 then the first nonzero eigenvalue of beginalign beginarrayrcll delta u mu u mbox in d setminus barb_0 fracpartial upartial nu 0 mbox on partial d setminus barb_0 endarray endalign attains maximum if and only if d is a geodesic ball centered at p
|
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|
[-0.2265662712050103, 0.099788939653558, 0.07816684462353994, -0.07596237421267325, -0.09555878764517158, -0.22333649036225156, -0.022236903712072008, 0.33539223316751543, -0.37301443500922676, -0.03922430631390371, 0.13752536512109773, -0.4648762238797187, -0.011541252800573906, 0.10917771588552927, -0.039642588411015076, -0.017484511482870318, 0.03836290076212153, 0.13439267155678708, -0.05639832395464792, -0.16817035823882318, 0.3122105736875795, -0.25926146873583394, 0.0916041007540265, 0.08908402908827519, 0.07407375462505905, -0.061603421972596335, 0.11621422222637333, -0.03879530958419722, -0.37035126373435967, -0.018211592625587403, 0.2235045548009335, 0.07403667407782107, 0.3421926310138339, -0.3515554829068034, -0.088069472151498, 0.26327398932625445, 0.19980406434570383, -0.22962572416602353, 0.0803799391953183, -0.33823218352359824, 0.19130780337037406, -0.001362263993487332, -0.15026454240226192, 0.03879181645260971, 0.1758142465959644, -0.01711080900566459, -0.475397776079471, 0.16932981218023052, 0.09767878199151407, -0.03217535871946217, -0.012747286544105068, -0.2894798000826617, -0.06137111335687461, -0.0017269267929626293, -0.03486145332727907, 0.27577575981805275, -0.001080944634467628, -0.0075586530344326636, 0.009464746778779993, 0.40786845282564965, -0.08805957265055733, -0.3475912533639396, -0.0679035886226456, -0.3119454114682606, -0.13940087274795837, 0.03786365660365488, 0.17128673594958999, 0.19106094068415014, -0.04283317766289731, 0.33459629124390533, -0.1211978522602652, 0.15360767243298334, 0.19178108517029654, -0.06227104966350592, 0.10696812343269668, 0.09134756143540755, 0.13479827364265431, 0.012556862494465514, -0.05107634807198914, 0.07791331316257924, -0.4415967510147987, -0.08309384840642371, -0.15009900013524327, 0.27066698863267735, -0.10185779245098597, -0.13223201249181574, 0.24736184805448427, -0.02691607628788359, 0.2381456182567311, 0.030333576800271135, 0.15939865108131548, 0.10195357190149892, -0.08452204435738057, 0.1608839181933776, -0.005831512700622555, 0.19587621794596233, 0.038621021116590076, -0.2521952159239661, -0.04589538694527306, 0.11366335317095527]
|
1,803.05751
|
Non-centrosymmetric superconductors on honeycomb lattice
|
We study non-centrosymmetric topological superconductivity in correlated
doped quantum spin-Hall insulators (QSHI) on honeycomb lattice without
inversion symmetry where the intrinsic (Kane-Mele) and Rashba spin-orbit
couplings can in general exist. We explore the generic topologically
non-trivial superconducting phase diagram of the model system. Over a certain
parameter space, the parity-mixing superconducting state with co-existing
spin-singlet $d$+$id$ and spin-triplet $p$+$ip$-wave pairing is found. On a
zigzag nanoribbon, the parity-mixing superconducting state shows co-existing
helical and chiral Majorana fermions at edges. Relevance of our results for
experiments is discussed.
|
cond-mat.supr-con cond-mat.mes-hall
|
we study noncentrosymmetric topological superconductivity in correlated doped quantum spinhall insulators qshi on honeycomb lattice without inversion symmetry where the intrinsic kanemele and rashba spinorbit couplings can in general exist we explore the generic topologically nontrivial superconducting phase diagram of the model system over a certain parameter space the paritymixing superconducting state with coexisting spinsinglet did and spintriplet pipwave pairing is found on a zigzag nanoribbon the paritymixing superconducting state shows coexisting helical and chiral majorana fermions at edges relevance of our results for experiments is discussed
|
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|
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|
1,803.05752
|
Rearrangement with Nonprehensile Manipulation Using Deep Reinforcement
Learning
|
Rearranging objects on a tabletop surface by means of nonprehensile
manipulation is a task which requires skillful interaction with the physical
world. Usually, this is achieved by precisely modeling physical properties of
the objects, robot, and the environment for explicit planning. In contrast, as
explicitly modeling the physical environment is not always feasible and
involves various uncertainties, we learn a nonprehensile rearrangement strategy
with deep reinforcement learning based on only visual feedback. For this, we
model the task with rewards and train a deep Q-network. Our potential
field-based heuristic exploration strategy reduces the amount of collisions
which lead to suboptimal outcomes and we actively balance the training set to
avoid bias towards poor examples. Our training process leads to quicker
learning and better performance on the task as compared to uniform exploration
and standard experience replay. We demonstrate empirical evidence from
simulation that our method leads to a success rate of 85%, show that our system
can cope with sudden changes of the environment, and compare our performance
with human level performance.
|
cs.RO cs.AI cs.LG
|
rearranging objects on a tabletop surface by means of nonprehensile manipulation is a task which requires skillful interaction with the physical world usually this is achieved by precisely modeling physical properties of the objects robot and the environment for explicit planning in contrast as explicitly modeling the physical environment is not always feasible and involves various uncertainties we learn a nonprehensile rearrangement strategy with deep reinforcement learning based on only visual feedback for this we model the task with rewards and train a deep qnetwork our potential fieldbased heuristic exploration strategy reduces the amount of collisions which lead to suboptimal outcomes and we actively balance the training set to avoid bias towards poor examples our training process leads to quicker learning and better performance on the task as compared to uniform exploration and standard experience replay we demonstrate empirical evidence from simulation that our method leads to a success rate of 85 show that our system can cope with sudden changes of the environment and compare our performance with human level performance
|
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|
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|
1,803.05753
|
What Catches the Eye? Visualizing and Understanding Deep Saliency Models
|
Deep convolutional neural networks have demonstrated high performances for
fixation prediction in recent years. How they achieve this, however, is less
explored and they remain to be black box models. Here, we attempt to shed light
on the internal structure of deep saliency models and study what features they
extract for fixation prediction. Specifically, we use a simple yet powerful
architecture, consisting of only one CNN and a single resolution input,
combined with a new loss function for pixel-wise fixation prediction during
free viewing of natural scenes. We show that our simple method is on par or
better than state-of-the-art complicated saliency models. Furthermore, we
propose a method, related to saliency model evaluation metrics, to visualize
deep models for fixation prediction. Our method reveals the inner
representations of deep models for fixation prediction and provides evidence
that saliency, as experienced by humans, is likely to involve high-level
semantic knowledge in addition to low-level perceptual cues. Our results can be
useful to measure the gap between current saliency models and the human
inter-observer model and to build new models to close this gap.
|
cs.CV
|
deep convolutional neural networks have demonstrated high performances for fixation prediction in recent years how they achieve this however is less explored and they remain to be black box models here we attempt to shed light on the internal structure of deep saliency models and study what features they extract for fixation prediction specifically we use a simple yet powerful architecture consisting of only one cnn and a single resolution input combined with a new loss function for pixelwise fixation prediction during free viewing of natural scenes we show that our simple method is on par or better than stateoftheart complicated saliency models furthermore we propose a method related to saliency model evaluation metrics to visualize deep models for fixation prediction our method reveals the inner representations of deep models for fixation prediction and provides evidence that saliency as experienced by humans is likely to involve highlevel semantic knowledge in addition to lowlevel perceptual cues our results can be useful to measure the gap between current saliency models and the human interobserver model and to build new models to close this gap
|
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|
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|
1,803.05754
|
FDD Massive MIMO via UL/DL Channel Covariance Extrapolation and Active
Channel Sparsification
|
We propose a novel method for massive Multiple-Input Multiple-Output (massive
MIMO) in Frequency Division Duplexing (FDD) systems. Due to the large frequency
separation between Uplink (UL) and Downlink (DL), in FDD systems channel
reciprocity does not hold. Hence, in order to provide DL channel state
information to the Base Station (BS), closed-loop DL channel probing and
Channel State Information (CSI) feedback is needed. In massive MIMO this incurs
typically a large training overhead. For example, in a typical configuration
with M = 200 BS antennas and fading coherence block of T = 200 symbols, the
resulting rate penalty factor due to the DL training overhead, given by max{0,
1 - M/T}, is close to 0. To reduce this overhead, we build upon the well-known
fact that the Angular Scattering Function (ASF) of the user channels is
invariant over frequency intervals whose size is small with respect to the
carrier frequency (as in current FDD cellular standards). This allows to
estimate the users' DL channel covariance matrix from UL pilots without
additional overhead. Based on this covariance information, we propose a novel
sparsifying precoder in order to maximize the rank of the effective sparsified
channel matrix subject to the condition that each effective user channel has
sparsity not larger than some desired DL pilot dimension T_{dl}, resulting in
the DL training overhead factor max{0, 1 - T_{dl} / T} and CSI feedback cost of
T_{dl} pilot measurements. The optimization of the sparsifying precoder is
formulated as a Mixed Integer Linear Program, that can be efficiently solved.
Extensive simulation results demonstrate the superiority of the proposed
approach with respect to concurrent state-of-the-art schemes based on
compressed sensing or UL/DL dictionary learning.
|
cs.IT math.IT
|
we propose a novel method for massive multipleinput multipleoutput massive mimo in frequency division duplexing fdd systems due to the large frequency separation between uplink ul and downlink dl in fdd systems channel reciprocity does not hold hence in order to provide dl channel state information to the base station bs closedloop dl channel probing and channel state information csi feedback is needed in massive mimo this incurs typically a large training overhead for example in a typical configuration with m 200 bs antennas and fading coherence block of t 200 symbols the resulting rate penalty factor due to the dl training overhead given by max0 1 mt is close to 0 to reduce this overhead we build upon the wellknown fact that the angular scattering function asf of the user channels is invariant over frequency intervals whose size is small with respect to the carrier frequency as in current fdd cellular standards this allows to estimate the users dl channel covariance matrix from ul pilots without additional overhead based on this covariance information we propose a novel sparsifying precoder in order to maximize the rank of the effective sparsified channel matrix subject to the condition that each effective user channel has sparsity not larger than some desired dl pilot dimension t_dl resulting in the dl training overhead factor max0 1 t_dl t and csi feedback cost of t_dl pilot measurements the optimization of the sparsifying precoder is formulated as a mixed integer linear program that can be efficiently solved extensive simulation results demonstrate the superiority of the proposed approach with respect to concurrent stateoftheart schemes based on compressed sensing or uldl dictionary learning
|
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|
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|
1,803.05755
|
Neutrino oscillations and exact eigenstates in magnetic field
|
We further develop a recently proposed new approach to the description of the
relativistic neutrino flavour $\nu_e^L \leftrightarrow \nu_{\mu}^L$, spin
$\nu_e^L \leftrightarrow \nu_{e}^R$ and spin-flavour $\nu_e^L \leftrightarrow
\nu_{\mu}^R$ oscillations in a constant magnetic field that is based on the use
of the exact neutrino stationary states in the magnetic field. The neutrino
flavour, spin and spin-flavour oscillations probabilities are calculated
accounting for the whole set of possible conversions between four neutrino
states. In general, the obtained expressions for the neutrino oscillations
probabilities exhibit new inherent features in the oscillation patterns. It is
shown, in particular, that: 1) in the presence of the transversal magnetic
field for a given choice of parameters (the energy and magnetic moments of
neutrinos and the strength of the magnetic field) the amplitude of the flavour
oscillations $\nu_e^L \leftrightarrow \nu_{\mu}^L$ at the vacuum frequency is
modulated by the magnetic field frequency, 2) the neutrino spin oscillation
probability (without change of the neutrino flavour) exhibits the dependence on
the mass square difference $\Delta m^2$.
|
hep-ph
|
we further develop a recently proposed new approach to the description of the relativistic neutrino flavour nu_el leftrightarrow nu_mul spin nu_el leftrightarrow nu_er and spinflavour nu_el leftrightarrow nu_mur oscillations in a constant magnetic field that is based on the use of the exact neutrino stationary states in the magnetic field the neutrino flavour spin and spinflavour oscillations probabilities are calculated accounting for the whole set of possible conversions between four neutrino states in general the obtained expressions for the neutrino oscillations probabilities exhibit new inherent features in the oscillation patterns it is shown in particular that 1 in the presence of the transversal magnetic field for a given choice of parameters the energy and magnetic moments of neutrinos and the strength of the magnetic field the amplitude of the flavour oscillations nu_el leftrightarrow nu_mul at the vacuum frequency is modulated by the magnetic field frequency 2 the neutrino spin oscillation probability without change of the neutrino flavour exhibits the dependence on the mass square difference delta m2
|
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|
[-0.17635887776047243, 0.28052425571357364, 0.015890506717542108, 0.13061166110954195, -0.0366187123410358, -0.07382013379350487, 0.06004500855903135, 0.3190669551308901, -0.21639792755120463, -0.28179410651349035, 0.004675306215528056, -0.2384210716007403, -0.0746869161165108, 0.18774457960218147, 0.08445073425358424, -0.012471199567012627, -0.005973930019268229, 0.058398545473996845, -0.10289910180598463, -0.12950389858398106, 0.29745169800986176, 0.04476564471249932, 0.301122510022958, 0.05195644831404867, 0.10137300453280196, -0.0068571998157818444, 0.006537884237398994, -0.04548218523500704, -0.1073580715967595, 0.0004475854138666592, 0.14982220767054455, 0.07659301376313063, 0.11532551220452493, -0.42337775547514483, -0.16010029563120354, 0.1290679100466652, 0.11675886404157781, 0.13765180372044536, -0.06996051395351947, -0.3041520435962986, 0.027377956398288533, -0.14408208419528842, -0.1465400349615896, -0.06088230601209073, 0.02216165987817582, 0.013694978033426715, -0.3412770131357197, 0.10846667961600276, 0.031801723966523546, 0.03397713521598307, -0.049559374991232995, -0.1531915609900514, -0.023779711610369063, 0.08174459085416941, 0.13416951546942577, 0.03663698941800583, 0.09628522901030177, -0.15004018745477957, -0.11924988018817331, 0.3595025804796559, -0.08634572477148492, -0.16366101290025045, 0.07108319500329807, -0.22423107425847943, -0.11236469571027288, 0.15008601650275702, 0.13149402718819633, 0.04066025328885284, -0.12869634961372275, 0.13194784422782163, -0.03877839359256262, 0.1373673475681707, 0.07396032726763536, 0.04250836895065999, 0.26731424588435815, 0.17299174395549838, 0.06807595403704998, 0.009060938076967477, -0.17899166694642302, -0.02657859258252293, -0.3415646261815553, -0.08793594174164182, -0.13697185082235402, 0.0921769034591692, -0.06957465672738382, -0.15619604275586865, 0.49625607196561583, 0.11216817405417653, 0.161886365724259, -0.03356573610149461, 0.26495743244657854, 0.12457036627451189, 0.02930488346424525, 0.04972723382525146, 0.28332946627212263, 0.22430179395107266, 0.12569518436883445, -0.3571154088456115, 0.0001455411469232451, 0.06020533443754253]
|
1,803.05756
|
Trivariate Spline Representations for Computer Aided Design and Additive
Manufacturing
|
Digital representations targeting design and simulation for Additive
Manufacturing (AM) are addressed from the perspective of Computer Aided
Geometric Design. We discuss the feasibility for multi-material AM for B-rep
based CAD, STL, sculptured triangles as well as trimmed and block-structured
trivariate locally refined spline representations. The trivariate spline
representations support Isogeometric Analysis (IGA), and topology structures
supporting these for CAD, IGA and AM are outlined. The ideas of (Truncated)
Hierarchical B-splines, T-splines and LR B-splines are outlined and the
approaches are compared. An example from the EC H2020 Factories of the Future
Research and Innovation Actions CAxMan illustrates both trimmed and
block-structured spline representations for IGA and AM.
|
math.NA
|
digital representations targeting design and simulation for additive manufacturing am are addressed from the perspective of computer aided geometric design we discuss the feasibility for multimaterial am for brep based cad stl sculptured triangles as well as trimmed and blockstructured trivariate locally refined spline representations the trivariate spline representations support isogeometric analysis iga and topology structures supporting these for cad iga and am are outlined the ideas of truncated hierarchical bsplines tsplines and lr bsplines are outlined and the approaches are compared an example from the ec h2020 factories of the future research and innovation actions caxman illustrates both trimmed and blockstructured spline representations for iga and am
|
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|
[-0.018732379902171616, 0.0054281198031488785, -0.07592009986907453, 0.06488875123872379, -0.13785852539074547, -0.16776661274554294, -0.04391647606356957, 0.41196297641808743, -0.2855672574401877, -0.22204166605946757, 0.21997045289298572, -0.2340788879631975, -0.18332853677430164, 0.21737104963302334, -0.12946118116726943, 0.11611875606195948, 0.05344845964051087, -0.08228992132870393, -0.07793098753840427, -0.2610851701688474, 0.2640914659877525, 0.08312061741495523, 0.3031741396859114, -0.04612394972273506, 0.07070052352511959, 0.04610547761511162, -0.15077844558057385, -0.022943890187889338, -0.1052955035596246, 0.19919622733005296, 0.3266584993662121, 0.15605559937055352, 0.2661684894168349, -0.42176860981734, -0.18225304541726398, -0.0019933872412298327, 0.13232224121272007, 0.033083854291031015, -0.09048252414354932, -0.30378639823365433, 0.07656575498447502, -0.20579303438105037, -0.09554841442503662, -0.17547230082172377, -0.046013759420292503, 0.09071764196530333, -0.35260451690372185, -0.0025477890734708756, 0.09338062158328803, 0.1712860093826306, -0.07719095438179151, -0.25175247448453003, -0.012319951176765227, 0.05966862777213209, -0.051229866129067665, 0.009313464825146039, 0.08267678732975065, -0.11849476465363508, -0.1514066208684904, 0.3640640249789179, 0.0443221265091082, -0.2729974252076071, 0.17006580964401016, -0.01814078962621845, -0.11360086683862816, 0.04685699177261825, 0.23077419931156057, 0.09712733263062819, -0.0893098046985742, 0.10507976923901675, 0.042601226032581006, 0.10653931397300596, 0.06414993391502823, -0.07047279818836495, 0.17867735328757156, 0.22209977759831698, -0.0068489813907333065, 0.10598011067676767, -0.08730213198523586, -0.09137450135530573, -0.28072151112714, -0.16377574117488672, -0.1361211738549173, -0.09470391140763308, -0.15470925193575372, -0.21707412738039672, 0.37784386527176217, 0.10272113212262428, 0.08913293541800753, 0.07909904481956265, 0.29378585061319523, 0.027976366062430997, 0.057981901099278685, 0.07877976899949189, 0.12967233565444491, 0.1358649038217927, 0.09568979323919967, -0.13776283350633892, 0.03811282777035974, 0.16090180733563186]
|
1,803.05757
|
Estimating the association between blood pressure variability and
cardiovascular disease: An application using the ARIC Study
|
The association between visit-to-visit systolic blood pressure variability
and cardiovascular events has recently received a lot of attention in the
cardiovascular literature. But blood pressure variability is usually estimated
on a person-by-person basis, and is therefore subject to considerable
measurement error. We demonstrate that hazard ratios estimated using this
approach are subject to bias due to regression dilution and we propose
alternative methods to reduce this bias: a two-stage method and a joint model.
For the two-stage method, in stage one repeated measurements are modelled using
a mixed effects model with a random component on the residual standard
deviation. The mixed effects model is used to estimate the blood pressure
standard deviation for each individual, which in stage two is used as a
covariate in a time-to-event model. For the joint model, the mixed effects
sub-model and time-to-event sub-model are fitted simultaneously using shared
random effects. We illustrate the methods using data from the Atherosclerosis
Risk in Communities (ARIC) study.
|
stat.AP
|
the association between visittovisit systolic blood pressure variability and cardiovascular events has recently received a lot of attention in the cardiovascular literature but blood pressure variability is usually estimated on a personbyperson basis and is therefore subject to considerable measurement error we demonstrate that hazard ratios estimated using this approach are subject to bias due to regression dilution and we propose alternative methods to reduce this bias a twostage method and a joint model for the twostage method in stage one repeated measurements are modelled using a mixed effects model with a random component on the residual standard deviation the mixed effects model is used to estimate the blood pressure standard deviation for each individual which in stage two is used as a covariate in a timetoevent model for the joint model the mixed effects submodel and timetoevent submodel are fitted simultaneously using shared random effects we illustrate the methods using data from the atherosclerosis risk in communities aric study
|
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|
[-0.021237335696453287, 0.05537025228511753, -0.10597114588877878, 0.10128349781991129, -0.06066810513653283, -0.15459946166449767, 0.07755964656752891, 0.3869049440389909, -0.2518703165528534, -0.28192758981033034, 0.128603135876258, -0.283032983641064, -0.1454490498532014, 0.17156555592785325, -0.13523322982573002, 0.07441547987455467, 0.07284140620020411, 0.0189901299762932, -0.00925858235191671, -0.22569497424886567, 0.26104285449826353, 0.047001078660430025, 0.33467156637998874, -0.010847913359039984, 0.11794498174761732, -0.0063907035023161455, -0.07402241834784923, 0.06700919731373682, -0.09104346591305118, 0.10368022954665453, 0.24079398815256525, 0.1063491933446073, 0.36305303882760637, -0.3949035656515439, -0.28254301392666575, 0.1519974537849801, 0.0748122793405592, 0.11805488416154827, -0.04809036572850397, -0.24662473300214177, 0.03388074990625511, -0.2116437567772824, -0.03995430077654573, -0.04639659238592634, -0.03239140987583676, -0.011466178511497829, -0.3724707877673443, 0.15903845433520633, -0.015419385606809607, 0.09951835850241987, -0.061856665808133454, -0.157679221045179, -0.007665856556861468, 0.1291246630687782, 0.09086597940676594, 0.01985625257575006, 0.15270205357832448, -0.09447130572296819, -0.09136500394077234, 0.3548322655084842, -0.07820000887245128, -0.23915887999922364, 0.15864383666512538, -0.10190674781714384, -0.15417502342530018, 0.1016232056496372, 0.2564487134358324, 0.07175187690113231, -0.21161524745864127, -0.02405531224011262, 0.01973163027392478, 0.1708225559577955, 0.009296238744549407, -0.05359014991155398, 0.17915607094999003, 0.20975543108751188, 0.0006405259189693808, 0.15257114675862468, -0.16765668595198002, -0.06030187430153103, -0.26014688907413736, -0.08586495264532899, -0.14162931304846732, -0.031184045527622384, -0.06860723438972546, -0.17721485229993952, 0.38285923541857386, 0.16724445307100155, 0.18881133699543634, 0.04783183735218368, 0.33872715001720816, 0.10497744079626534, 0.07921602992844656, 0.005556140698305091, 0.1953544668478411, 0.12341428420406843, 0.05908691088827151, -0.22472123860721271, 0.16907402111287667, 0.032929875255333925]
|
1,803.05758
|
The measures of pseudorandomness and the NIST tests
|
A few years ago new quantitative measures of pseudorandomness of binary
sequences have been introduced. Since that these measures have been studied in
many papers and many constructions have been given along these lines. In this
paper the connection between the new measures and the NIST tests is analyzed.
It is shown that finite binary sequences possessing strong pseudorandom
properties in terms of these new measures usually also pass or nearly pass most
of the NIST tests.
|
math.NT
|
a few years ago new quantitative measures of pseudorandomness of binary sequences have been introduced since that these measures have been studied in many papers and many constructions have been given along these lines in this paper the connection between the new measures and the nist tests is analyzed it is shown that finite binary sequences possessing strong pseudorandom properties in terms of these new measures usually also pass or nearly pass most of the nist tests
|
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|
[-0.1028327602611903, 0.10393710832365534, -0.10604437730916134, 0.08035957713629567, 5.4173171520233154e-05, -0.13708152403667956, 0.012307270023330756, 0.4005295127243191, -0.23214698623557417, -0.3104621245489492, 0.12235629858521672, -0.30392697342223934, -0.1481884227341416, 0.28190841925838456, -0.0979600138357514, 0.13410601330249777, 0.087405984560572, 0.036662160672924736, -0.08241896418999735, -0.32219253299915074, 0.29084365466585405, 0.05409368166288772, 0.28561212376437406, 0.029102139078177415, 0.08955448060356952, -0.06854402188622913, -0.08410841334828889, 0.04905790216349936, -0.12341609064511526, 0.11586836702492717, 0.22697959164937645, 0.17905510959892787, 0.3165637661231222, -0.3803014126787712, -0.24288138488380165, 0.13280772862883358, 0.11702687214294981, 0.07715829767818962, -0.08863099544103463, -0.2692044476053206, 0.1299419402350466, -0.17920262038756113, -0.027144263873433137, -0.10091020635105427, 0.06479663360718783, 0.10698574021845669, -0.16560726029822578, -0.01425168103600441, 0.09928904982380472, 0.15583130558831737, 0.011233420960919617, -0.11384809737444504, 0.033752422066187705, 0.1639136454036048, 0.11240936931246867, 0.012138321130935634, 0.0023915840965973868, -0.04964670286417104, -0.1806757328668972, 0.3369463722935164, -0.02207720342951913, -0.16765918634686763, 0.26689537216655235, -0.13107499508066223, -0.23690537358452748, 0.0995137938782089, 0.14995858979157425, 0.13337547871489802, -0.20134645422872205, 0.07417800553088597, -0.11438264702628186, 0.14794162931767377, 0.17842200720174747, 0.09858631124635311, 0.20111993051968613, 0.07431098894978111, -0.01271192151176223, 0.11583623545646499, -0.07151626227060695, -0.12006929279728369, -0.23843640534437033, -0.15571971220726316, -0.17666248542970264, -0.006668225326877717, -0.03164156185207562, -0.2013806969108054, 0.3983021155906865, 0.12220644372720997, 0.15686949222747767, -0.00887439197969514, 0.22094588854059868, 0.11550776357762516, 0.10232278189089682, 0.04336132080741711, 0.2859815817156976, 0.17225970063576257, 0.03535535055902097, -0.06591389645132925, 0.10702198015695269, 0.05626682470879191]
|
1,803.05759
|
Salient Region Segmentation
|
Saliency prediction is a well studied problem in computer vision. Early
saliency models were based on low-level hand-crafted feature derived from
insights gained in neuroscience and psychophysics. In the wake of deep learning
breakthrough, a new cohort of models were proposed based on neural network
architectures, allowing significantly higher gaze prediction than previous
shallow models, on all metrics.
However, most models treat the saliency prediction as a \textit{regression}
problem, and accurate regression of high-dimensional data is known to be a hard
problem. Furthermore, it is unclear that intermediate levels of saliency (ie,
neither very high, nor very low) are meaningful: Something is either salient,
or it is not.
Drawing from those two observations, we reformulate the saliency prediction
problem as a salient region \textit{segmentation} problem. We demonstrate that
the reformulation allows for faster convergence than the classical regression
problem, while performance is comparable to state-of-the-art.
We also visualise the general features learned by the model, which are showed
to be consistent with insights from psychophysics.
|
cs.CV
|
saliency prediction is a well studied problem in computer vision early saliency models were based on lowlevel handcrafted feature derived from insights gained in neuroscience and psychophysics in the wake of deep learning breakthrough a new cohort of models were proposed based on neural network architectures allowing significantly higher gaze prediction than previous shallow models on all metrics however most models treat the saliency prediction as a textitregression problem and accurate regression of highdimensional data is known to be a hard problem furthermore it is unclear that intermediate levels of saliency ie neither very high nor very low are meaningful something is either salient or it is not drawing from those two observations we reformulate the saliency prediction problem as a salient region textitsegmentation problem we demonstrate that the reformulation allows for faster convergence than the classical regression problem while performance is comparable to stateoftheart we also visualise the general features learned by the model which are showed to be consistent with insights from psychophysics
|
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|
[0.015738380504372113, -0.0069098788632459916, -0.09931783055875198, 0.12113525125232348, -0.13457358547234965, -0.21567044150872738, -0.006390654933324621, 0.4416742419218359, -0.25434357918401823, -0.3328315864382826, 0.11114113000964324, -0.28149680098373386, -0.22288023263495987, 0.22262762640917136, -0.139019053961626, 0.11304872431092398, 0.13144247983068091, 0.050727132587847897, -0.0594718474394819, -0.255150687897955, 0.2705246533818566, 0.07033907268264193, 0.3213186444246147, 0.026699286965550455, 0.11079955012523254, -0.07501313042901228, -0.04698776928536548, 0.023317401370953516, -0.059874836715853176, 0.17160258286324062, 0.31296649610488375, 0.19732445911818577, 0.32131511804882, -0.4257361925338492, -0.2970523462385122, 0.07338529810712222, 0.1410867746553721, 0.12846838926005125, -0.0062586877550758375, -0.32109166252101123, 0.080237164912014, -0.1313879940547392, 0.03497113638980303, -0.10598687994568123, -0.027592890995891732, -0.052539950129190355, -0.27156708331527246, 0.08761498957363163, 0.05691284294443011, 0.0639646107508041, -0.08570112003637706, -0.14073126951726783, 0.00654340567005844, 0.1518584390362279, 0.04640516725531636, 0.09562429372346931, 0.12325384608395626, -0.22993919483715944, -0.13176384362880644, 0.381183855715522, -0.04419181210026745, -0.20636461400912584, 0.2386683306265394, -0.07513120934721425, -0.16582674666256444, 0.11693880801300513, 0.1962322072537353, 0.13660550222052203, -0.13815016969695595, 0.0035726802683923894, -0.049702466945478155, 0.17732778652799688, 0.026648878442706324, -0.026539374669610975, 0.22304126772596758, 0.2519644483283985, 0.027068986163183224, 0.11133755913412804, -0.10361267753842464, -0.09846986968361664, -0.17072299229083981, -0.061292017142176254, -0.1739479178181375, -0.028692138388801504, -0.09330785421613873, -0.13014658509062293, 0.39319273700903346, 0.22710297273670502, 0.24557349960565383, 0.11756020885580819, 0.33518987400400124, 0.06417175156544278, 0.088060141286807, 0.0946195403448209, 0.239977903555553, 0.03214170079695438, 0.0896068231296937, -0.13640425730342376, 0.13619735508020167, 0.07740095894258081]
|
1,803.0576
|
A Study of Car-to-Train Assignment Problem for Rail Express Cargos on
Scheduled and Unscheduled Train Service Network
|
Freight train services in a railway network system are generally divided into
two categories: one is the unscheduled train, whose operating frequency
fluctuates with origin-destination (OD) demands; the other is the scheduled
train, which is running based on regular timetable just like the passenger
trains. The timetable will be released to the public if determined and it would
not be influenced by OD demands. Typically, the total capacity of scheduled
trains can usually satisfy the predicted demands of express cargos in average.
However, the demands are changing in practice. Therefore, how to distribute the
shipments between different stations to unscheduled and scheduled train
services has become an important research field in railway transportation. This
paper focuses on the coordinated optimization of the rail express cargos
distribution in two service networks. On the premise of fully utilizing the
capacity of scheduled service network first, we established a Car-to-Train
(CTT) assignment model to assign rail express cargos to scheduled and
unscheduled trains scientifically. The objective function is to maximize the
net income of transporting the rail express cargos. The constraints include the
capacity restriction on the service arcs, flow balance constraints, logical
relationship constraint between two groups of decision variables and the due
date constraint. The last constraint is to ensure that the total transportation
time of a shipment would not be longer than its predefined due date. Finally,
we discuss the linearization techniques to simplify the model proposed in this
paper, which make it possible for obtaining global optimal solution by using
the commercial software.
|
cs.AI
|
freight train services in a railway network system are generally divided into two categories one is the unscheduled train whose operating frequency fluctuates with origindestination od demands the other is the scheduled train which is running based on regular timetable just like the passenger trains the timetable will be released to the public if determined and it would not be influenced by od demands typically the total capacity of scheduled trains can usually satisfy the predicted demands of express cargos in average however the demands are changing in practice therefore how to distribute the shipments between different stations to unscheduled and scheduled train services has become an important research field in railway transportation this paper focuses on the coordinated optimization of the rail express cargos distribution in two service networks on the premise of fully utilizing the capacity of scheduled service network first we established a cartotrain ctt assignment model to assign rail express cargos to scheduled and unscheduled trains scientifically the objective function is to maximize the net income of transporting the rail express cargos the constraints include the capacity restriction on the service arcs flow balance constraints logical relationship constraint between two groups of decision variables and the due date constraint the last constraint is to ensure that the total transportation time of a shipment would not be longer than its predefined due date finally we discuss the linearization techniques to simplify the model proposed in this paper which make it possible for obtaining global optimal solution by using the commercial software
|
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|
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|
1,803.05761
|
Stability of velocity-Verlet- and Liouville-operator-derived algorithms
to integrate non-Hamiltonian systems
|
We investigate the difference between the velocity Verlet and the
Liouville-operator-derived (LOD) algorithms by studying two non-Hamiltonian
systems, one dissipative and the other conservative, for which the Jacobian of
the transformation can be determined exactly. For the two systems, we
demonstrate that (1) the velocity Verlet scheme fails to integrate the former
system while the first- and second-order LOD schemes succeed, (2) some
first-order LOD fails to integrate the latter system while the velocity Verlet
and the other first- and second-order schemes succeed. We have shown that the
LOD schemes are stable for the former system by determining the explicit forms
of the shadow Hamiltonians which are exactly conserved by the schemes. We have
shown that Jacobian of the velocity Verlet scheme for the former system and
that of the first-order LOD scheme for the latter system are always smaller
than the exact values, and therefore, the schemes are unstable. The
decomposition-order dependence of LOD schemes is also considered.
|
physics.comp-ph
|
we investigate the difference between the velocity verlet and the liouvilleoperatorderived lod algorithms by studying two nonhamiltonian systems one dissipative and the other conservative for which the jacobian of the transformation can be determined exactly for the two systems we demonstrate that 1 the velocity verlet scheme fails to integrate the former system while the first and secondorder lod schemes succeed 2 some firstorder lod fails to integrate the latter system while the velocity verlet and the other first and secondorder schemes succeed we have shown that the lod schemes are stable for the former system by determining the explicit forms of the shadow hamiltonians which are exactly conserved by the schemes we have shown that jacobian of the velocity verlet scheme for the former system and that of the firstorder lod scheme for the latter system are always smaller than the exact values and therefore the schemes are unstable the decompositionorder dependence of lod schemes is also considered
|
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|
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|
1,803.05762
|
Measuring properties of a Heavy Higgs boson in the $H\to t\bar t \to
bW^+\bar b W^-$ decay
|
Suppose a heavy neutral Higgs or scalar boson $H$ is discovered at the LHC,
it is important to investigate its couplings to the standard model particles as
much as possible. Here in this work we attempt to probe the CP-even and CP-odd
couplings of the heavy Higgs boson to a pair of top quarks, through the decay
$H \to t\bar t \to b W^+ \bar b W^-$. We use the helicity-amplitude method to
write down the most general form for the angular distributions of the
final-state $b$ quarks and $W$ bosons. We figure out that there are 6 types of
angular observables and, under CP$\widetilde{\rm T}$ conservation,
one-dimensional angular distributions can only reveal two of them.
Nevertheless, the $H$ couplings to the
$t\bar t$ pair can be fully determined by exploiting the one-dimensional
angular distributions. A Higgs-boson mass of 380 GeV not too far above the
$t\bar t$ threshold is illustrated with full details. With a total of $10^4$
events of $H \to t\bar t \to bW^+ \bar b W^+$, one can determine the couplings
up to 10-20 % uncertainties.
|
hep-ph
|
suppose a heavy neutral higgs or scalar boson h is discovered at the lhc it is important to investigate its couplings to the standard model particles as much as possible here in this work we attempt to probe the cpeven and cpodd couplings of the heavy higgs boson to a pair of top quarks through the decay h to tbar t to b w bar b w we use the helicityamplitude method to write down the most general form for the angular distributions of the finalstate b quarks and w bosons we figure out that there are 6 types of angular observables and under cpwidetilderm t conservation onedimensional angular distributions can only reveal two of them nevertheless the h couplings to the tbar t pair can be fully determined by exploiting the onedimensional angular distributions a higgsboson mass of 380 gev not too far above the tbar t threshold is illustrated with full details with a total of 104 events of h to tbar t to bw bar b w one can determine the couplings up to 1020 uncertainties
|
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|
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|
1,803.05763
|
Unmanned Aerial Vehicle Assisted Cellular Communication
|
In this paper, we consider unmanned aerial vehicles (UAVs) assisted cellular
communication system, where UAVs can be used as amplify-and-forward (AF)
relays. The effective channel with UAV assisted communication can be modeled as
a Rayleigh product-channel, and we derive a tight lower-bound of the ergodic
capacity in closed-form. With the obtained lower-bound, trade-offs between the
transmit power and the equipped number of antennas of the UAVs can be analyzed.
Alternatively, for a giving setting of users and the base-transceiver station
(BTS), the needed transmit power and number of antennas for the UAVs can be
derived in order to have a higher ergodic capacity with the UAV assisted
communication than that without it.
|
cs.IT math.IT
|
in this paper we consider unmanned aerial vehicles uavs assisted cellular communication system where uavs can be used as amplifyandforward af relays the effective channel with uav assisted communication can be modeled as a rayleigh productchannel and we derive a tight lowerbound of the ergodic capacity in closedform with the obtained lowerbound tradeoffs between the transmit power and the equipped number of antennas of the uavs can be analyzed alternatively for a giving setting of users and the basetransceiver station bts the needed transmit power and number of antennas for the uavs can be derived in order to have a higher ergodic capacity with the uav assisted communication than that without it
|
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|
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|
1,803.05764
|
Optical validation and characterization of Planck PSZ1 sources at the
Canary Islands observatories. I. First year of ITP13 observations
|
We identify new clusters and characterize previously unknown Planck
Sunyaev-Zeldovich (SZ) sources from the first Planck catalogue of SZ sources
(PSZ1). The results presented here correspond to an optical follow-up
observational programme developed during approximately one year (2014) at Roque
de los Muchachos Observatory, using the 2.5m Isaac Newton telescope, the 3.5m
Telescopio Nazionale Galileo, the 4.2m William Herschel telescope and the 10.4m
Gran Telescopio Canarias. We characterize 115 new PSZ1 sources using deep
optical imaging and spectroscopy. We adopt robust criteria in order to
consolidate the SZ counterparts by analysing the optical richness, the 2D
galaxy distribution, and velocity dispersions of clusters. Confirmed
counterparts are considered to be validated if they are rich structures, well
aligned with the Planck PSZ1 coordinate and show relatively high velocity
dispersion. Following this classification, we confirm 53 clusters, which means
that 46% of this PSZ1 subsample has been validated and characterized with this
technique. Sixty-two SZ sources (54% of this PSZ1 subset) remain unconfirmed.
In addition, we find that the fraction of unconfirmed clusters close to the
galactic plane (at |b|<25deg) is greater than that at higher galactic latitudes
(|b|>25deg), which indicates contamination produced by radio emission of
galactic dust and gas clouds on these SZ detections. In fact, in the majority
of the cases, we detect important galactic cirrus in the optical images, mainly
in the SZ target located at low galactic latitudes, which supports this
hypothesis.
|
astro-ph.CO
|
we identify new clusters and characterize previously unknown planck sunyaevzeldovich sz sources from the first planck catalogue of sz sources psz1 the results presented here correspond to an optical followup observational programme developed during approximately one year 2014 at roque de los muchachos observatory using the 25m isaac newton telescope the 35m telescopio nazionale galileo the 42m william herschel telescope and the 104m gran telescopio canarias we characterize 115 new psz1 sources using deep optical imaging and spectroscopy we adopt robust criteria in order to consolidate the sz counterparts by analysing the optical richness the 2d galaxy distribution and velocity dispersions of clusters confirmed counterparts are considered to be validated if they are rich structures well aligned with the planck psz1 coordinate and show relatively high velocity dispersion following this classification we confirm 53 clusters which means that 46 of this psz1 subsample has been validated and characterized with this technique sixtytwo sz sources 54 of this psz1 subset remain unconfirmed in addition we find that the fraction of unconfirmed clusters close to the galactic plane at b25deg is greater than that at higher galactic latitudes b25deg which indicates contamination produced by radio emission of galactic dust and gas clouds on these sz detections in fact in the majority of the cases we detect important galactic cirrus in the optical images mainly in the sz target located at low galactic latitudes which supports this hypothesis
|
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|
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|
1,803.05765
|
Improved Dynamic Geodesic Nearest Neighbor Searching in a Simple Polygon
|
We present an efficient dynamic data structure that supports geodesic nearest
neighbor queries for a set $S$ of point sites in a static simple polygon $P$.
Our data structure allows us to insert a new site in $S$, delete a site from
$S$, and ask for the site in $S$ closest to an arbitrary query point $q \in P$.
All distances are measured using the geodesic distance, that is, the length of
the shortest path that is completely contained in $P$. Our data structure
achieves polylogarithmic update and query times, and uses $O(n\log^3n\log m +
m)$ space, where $n$ is the number of sites in $S$ and $m$ is the number of
vertices in $P$. The crucial ingredient in our data structure is an implicit
representation of a vertical shallow cutting of the geodesic distance
functions. We show that such an implicit representation exists, and that we can
compute it efficiently.
|
cs.CG
|
we present an efficient dynamic data structure that supports geodesic nearest neighbor queries for a set s of point sites in a static simple polygon p our data structure allows us to insert a new site in s delete a site from s and ask for the site in s closest to an arbitrary query point q in p all distances are measured using the geodesic distance that is the length of the shortest path that is completely contained in p our data structure achieves polylogarithmic update and query times and uses onlog3nlog m m space where n is the number of sites in s and m is the number of vertices in p the crucial ingredient in our data structure is an implicit representation of a vertical shallow cutting of the geodesic distance functions we show that such an implicit representation exists and that we can compute it efficiently
|
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|
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|
1,803.05766
|
The foundations of $(2n,k)$-manifolds
|
In the focus of our paper is a system of axioms that serves as a basis for
introducing structural data for $(2n,k)$-manifolds $M^{2n}$, where $M^{2n}$ is
a smooth, compact $2n$-dimensional manifold with a smooth effective action of
the $k$-dimensional torus $T^k$. In terms of these data a construction of the
model space $\mathfrak{E}$ with an action of the torus $T^k$ is given, such
that there exists a $T^k$-equivariant homeomorphism $\mathfrak{E}\to M^{2n}$.
This homeomorphism induces a homeomorphism $\mathfrak{E}/T^k\to M^{2n}/T^k$.
The number $d=n-k$ is called the complexity of an $(2n,k)$-manifold. Our theory
comprises toric geometry and toric topology, where $d=0$. It is shown that the
class of homogeneous spaces $G/H$ of compact Lie groups, where rk$G=$rk$H$,
contains $(2n,k)$-manifolds that have non zero complexity. The results are
demonstrated on the complex Grassmann manifolds $G_{k+1,q}$ with an effective
action of the torus $T^k$.
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math.AT
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in the focus of our paper is a system of axioms that serves as a basis for introducing structural data for 2nkmanifolds m2n where m2n is a smooth compact 2ndimensional manifold with a smooth effective action of the kdimensional torus tk in terms of these data a construction of the model space mathfrake with an action of the torus tk is given such that there exists a tkequivariant homeomorphism mathfraketo m2n this homeomorphism induces a homeomorphism mathfraketkto m2ntk the number dnk is called the complexity of an 2nkmanifold our theory comprises toric geometry and toric topology where d0 it is shown that the class of homogeneous spaces gh of compact lie groups where rkgrkh contains 2nkmanifolds that have non zero complexity the results are demonstrated on the complex grassmann manifolds g_k1q with an effective action of the torus tk
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