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1208.6419	i	in this paper , we determined the ages and masses for a sample of m31 star clusters by comparing the multicolor photometry with theoretical sps models . multicolor photometric data are from the _ galex _ fuv and nuv , broadband @xmath0 , sdss @xmath1 , 15 intermediate - band filters of batc , and 2mass @xmath2 , which ...	the mean value of age and mass of young clusters ( gyr ) is about 385 myr and , respectively . there are two distinct peaks in the age distribution , a highest peak at age 60 myr and a secondary peak around 250 myr , while the mass distribution shows a single peak around . a few young star clusters have two - body rela...	in this paper , we present photometry for young star clusters in m31 , which are selected from caldwell et al . these star clusters have been observed as part of the beijing arizona taiwan connecticut ( batc ) multicolor sky survey from 1995 february to 2008 march . the batc images including these star clusters are ...
1507.08495	r	theorem [ to_end ] makes use of the compacity theorems which are not algorithmically true . we shall use the tools used in the proof of theorem [ to_end ] to prove that it is algorithmically impossible to say whether two given ends are equal or not . the theorem says that in a sequence of embedded quarters , their ve...	in this paper , we prove two results . first , there is a family of sequences of embedded quarters of the hyperbolic plane such that any sequence converges to a limit which is an end of the hyperbolic plane . second , there is no algorithm which would allow us to check whether two given ends are equal or not . * key...	in this paper , we prove two results . first , there is a family of sequences of embedded quarters of the hyperbolic plane such that any sequence converges to a limit which is an end of the hyperbolic plane . second , there is no algorithm which would allow us to check whether two given ends are equal or not . * key...
1603.01659	i	the fifth - generation ( 5 g ) wireless networks are expected to provide ubiquitous services to a larger number of simultaneous mobile devices with device density far beyond the current wireless communication systems . to cope with these challenges , ultra - dense low power nodes and cloud computing are regarded as two...	in this paper , we study the stochastic optimization of cloud radio access networks ( c - rans ) by joint remote radio head ( rrh ) activation and beamforming in the downlink . unlike most previous works that only consider a static optimization framework with full traffic buffers , we formulate a dynamic optimization p...	in this paper , we study the stochastic optimization of cloud radio access networks ( c - rans ) by joint remote radio head ( rrh ) activation and beamforming in the downlink . unlike most previous works that only consider a static optimization framework with full traffic buffers , we formulate a dynamic optimization p...
astro-ph0102134	i	most of the progress in understanding the formation and evolution of the milky way galaxy comes , on one side , from observations concerning chemical abundances in stars and gas and from the continuous improvement of stellar nucleosynthesis calculations on the other side . other important quantities relevant to the che...	the present model takes into account in more detail than previously the halo density distribution and explores the effects of a threshold density in the star formation process , during both the halo and disk phases . we have focused our attention on abundance gradients as well as gas , stellar and star formation rate d...	in this paper we adopt a chemical evolution model , which is an improved version of the chiappini , matteucci , & gratton ( 1997 ) model , assuming two main accretion episodes for the formation of the galaxy : the first one forming the halo and bulge in a short timescale followed by a second one that forms the thin - d...
astro-ph0102134	r	all the above models can fit the available constraints in the solar vicinity ( see table 2 ) , however they differ substantially in reproducing the properties of the whole disk . in particular , concerning the solar neighborhood , our models are in good agreement with what is called the minimum set of observational con...	the model also includes the most recent nucleosynthesis prescriptions concerning supernovae of all types , novae and single stars dying as white dwarfs . in the comparison between model predictions and available data , this is due to the fact that the halo and disk densities are comparable at large galactocentric dista...	in this paper we adopt a chemical evolution model , which is an improved version of the chiappini , matteucci , & gratton ( 1997 ) model , assuming two main accretion episodes for the formation of the galaxy : the first one forming the halo and bulge in a short timescale followed by a second one that forms the thin - d...
astro-ph0102134	c	in this paper we have presented an improved version of the model of cmg97 for the chemical evolution of the milky way . this model assumes that the halo and disk form almost independently out of two different episodes of infall of gas of primordial chemical composition . this scenario is suggested by many observational...	in particular , a threshold in the star formation implies the occurrence of a gap in the star formation at the halo - disk transition phase , in agreement with recent data . we conclude that a relatively short halo formation timescale ( 0.8 gyr ) , in agreement with recent estimates for the age differences among gal...	in this paper we adopt a chemical evolution model , which is an improved version of the chiappini , matteucci , & gratton ( 1997 ) model , assuming two main accretion episodes for the formation of the galaxy : the first one forming the halo and bulge in a short timescale followed by a second one that forms the thin - d...
1701.07397	i	stars are formed in gravitationally collapsed clouds made of molecular hydrogen gas . these gas clouds appear to be composed of many well - defined gas substructures , so that these assembled clouds can be very large and massive . thus , all gas structures have been characterized according to @xcite by means of their s...	we extend the mass range and consider the collapse of two uniform gas clumps of m= 50 and 400 m , so that they also rotates rigidly in such a way that its approximate virial parameter takes the values of 0.5 , 1.5 , and 2.5 and their collapse is induced initially by implementing an azimuthal mass perturbation . to asse...	in this paper we continue the investigation reported by concerning the morphology of binary configurations obtained via the collapse of rotating parent gas structures with total masses in the range of m= 1 to 5 m . here we extend the mass range and consider the collapse of two uniform gas clumps of m= 50 and 400 m , so...
1410.4564	i	it was once thought that we understood how globular clusters ( gcs ) formed in the early universe , but recent discoveries of their multiple populations ( mps ) have unraveled our long - held view of gcs as `` simple stellar populations '' formed in a single burst . it now appears that virtually _ all _ of them host mu...	this `` magic trio '' of filters has shown an uncanny ability to disentangle and characterize multiple - population ( mp ) patterns in gcs in a way that is exquisitely sensitive to c , n , and o abundance variations . the ubiquity of multiple stellar generations in gcs has made the formation of these cornerstone object...	in this paper we describe a new uv - initiative _ hst _ project ( go-13297 ) that will complement the existing f606w and f814w database of the acs globular cluster ( gc ) treasury by imaging most of its clusters through uv / blue wfc3/uvis filters f275w , f336w and f438w . this `` magic trio '' of filters has shown an ...
0801.1035	i	since 1970s and 1980s studies of the radio and far - infrared ( fir ) properties of galaxies have shown there to be a tight correlation between their emission in these two observing bands which extends over several orders of magnitude in luminosity @xcite . the advent of the _ infrared astronomical satellite _ ( iras )...	in this paper we investigate the radio - mir correlation at very low flux densities using extremely deep 1.4ghz sub - arcsecond angular resolution merlinvla observations of a 85 field centred upon the hubble deep field north , in conjunction with 24 data . from these results the mir - radio correlation is extended to...	in this paper we investigate the radio - mir correlation at very low flux densities using extremely deep 1.4ghz sub - arcsecond angular resolution merlinvla observations of a 85 field centred upon the hubble deep field north , in conjunction with 24 data . from these results the mir - radio correlation is extended to...
0801.1035	c	the primary results of this work demonstrate that this sample of individual 24 selected sources follow the mir - radio correlation down to radio flux densities of a few microjy . these results are consistent with shallower independent radio surveys ( such as the atca observations of the swire field ) and seamlessly ex...	tentatively we detect a small deviation from the correlation at the faintest ir flux densities . we suggest that this small observed change in the gradient of the correlation is the result of a suppression of the mir emission in faint star - forming galaxies . this deviation potentially has significant implications for...	in this paper we investigate the radio - mir correlation at very low flux densities using extremely deep 1.4ghz sub - arcsecond angular resolution merlinvla observations of a 85 field centred upon the hubble deep field north , in conjunction with 24 data . from these results the mir - radio correlation is extended to...
cs0509006	i	on a wireless channel , diversity techniques are used to combat channel fadings . recently , there has been a growing interest in the so called _ cooperative diversity _ techniques , where multiple terminals in a network cooperate to form a virtual antenna array in order to exploit spatial diversity in a distributed fa...	in this work , we extend the non - orthogonal amplify - and - forward ( naf ) cooperative diversity scheme to the mimo channel . we provide a general explicit algebraic construction , followed by some examples . in particular , in the single - relay case , it is proved that the golden code and the perfect code are opt...	in this work , we extend the non - orthogonal amplify - and - forward ( naf ) cooperative diversity scheme to the mimo channel . a family of space - time block codes for a half - duplex mimo naf fading cooperative channel with relays is constructed . the code construction is based on the non - vanishing determinant (...
0902.3210	i	wireless operators are in the process of augmenting the macrocell network with supplemental infrastructure such as microcells , distributed antennas and relays . an alternative with lower upfront costs is to improve indoor coverage and capacity using the concept of _ end - consumer _ installed femtocells or home base s...	this work derives the maximum number of simultaneously transmitting multiple antenna femtocells meeting a per - tier outage probability constraint . coverage dead zones are presented wherein cross - tier interference bottlenecks cellular and femtocell coverage . two operating regimes are shown namely 1 ) a cellular - l...	in two - tier networks comprising a conventional cellular network overlaid with shorter range hotspots ( e.g. femtocells , distributed antennas , or wired relays ) with universal frequency reuse , the near - far effect from cross - tier interference creates dead spots where reliable coverage can not be guaranteed to ...
0902.3210	c	in two - tier cellular systems with universal frequency reuse , cross - tier interference will likely be the main obstacle preventing uniform coverage . this paper has derived analytical expressions for the coverage zones in such a tiered architecture with spatial diversity considering the number of antennas , the maxi...	in two - tier networks comprising a conventional cellular network overlaid with shorter range hotspots ( e.g. femtocells , distributed antennas , or wired relays ) with universal frequency reuse , the near - far effect from cross - tier interference creates dead spots where reliable coverage can not be guaranteed to ...	in two - tier networks comprising a conventional cellular network overlaid with shorter range hotspots ( e.g. femtocells , distributed antennas , or wired relays ) with universal frequency reuse , the near - far effect from cross - tier interference creates dead spots where reliable coverage can not be guaranteed to ...
astro-ph0001500	c	we have detected large , distorted images of the quasar host galaxy in the gravitational lens q 0957 + 561 . in the h band ( rest frame r ) , the host galaxy appears as two long ( @xmath05 ) arcs stretched tangentially relative to the lens galaxy . previously published models of q 0957 + 561 fail to predict the corre...	the shape of the lens galaxy s mass distribution must be remarkably similar to the shape of its luminosity distribution , and most models that produce reasonable values for the hubble constant roughly match the observed ellipticity gradient and isophote twist of the lens galaxy . although there are still degeneracies i...	infrared images of the q 0957 + 561 gravitational lens obtained with the hubble space telescope show two large ( ) lensed images of the quasar host galaxy . parts of the host galaxy are doubly - imaged like the quasar , while other parts are quadruply - imaged . the distortions of the host galaxy offer the best probe ...
1506.03576	i	geometrically frustrated magnets have attracted a long - standing and ongoing attention in the field of condensed matter physics because they often give rise to a variety of nontrivial thermodynamic states . in particular , the quantum spin liquid ( qsl ) state having no magnetic long - range order ( lro ) has been ext...	inspired by the recent theoretical suggestion that the random - bond antiferromagnetic heisenberg model on the triangular and the kagome lattices might exhibit a randomness - induced quantum spin liquid ( qsl ) behavior when the strength of the randomness exceeds a critical value , and that this `` random - singlet sta...	inspired by the recent theoretical suggestion that the random - bond antiferromagnetic heisenberg model on the triangular and the kagome lattices might exhibit a randomness - induced quantum spin liquid ( qsl ) behavior when the strength of the randomness exceeds a critical value , and that this `` random - singlet sta...
1506.03576	i	we studied by means of an ed method the nature of spin correlations of the random - bond @xmath0 af heisenberg models on the triangular and the kagome lattices via the static and the dynamical spin structure factors . to hilight the possible importance of frustration , we also made a comparative calculation for the unf...	we compute the static and the dynamical spin structure factors , and , by means of an exact diagonalization method . in both triangular and kagome models , the computed in the random - singlet state depends on the wavevector only weakly , robustly exhibiting gapless behaviors accompnied by the broad distribution extend...	inspired by the recent theoretical suggestion that the random - bond antiferromagnetic heisenberg model on the triangular and the kagome lattices might exhibit a randomness - induced quantum spin liquid ( qsl ) behavior when the strength of the randomness exceeds a critical value , and that this `` random - singlet sta...
hep-th0212027	i	recently , it has been claimed in a series of articles @xcite that the cosmic dark energy component could be explained naturally by the trans - planckian energy of a scalar field with a suitable non - linear dispersion relation in the trans - planckian regime . such dispersion relations , which relate the frequency @x...	it has recently been proposed in refs . that the dark energy could be attributed to the cosmological properties of a scalar field with a non - standard dispersion relation that decreases exponentially at wave - numbers larger than planck scale ( ) . in this scenario , the energy density stored in the modes of trans - ...	it has recently been proposed in refs . that the dark energy could be attributed to the cosmological properties of a scalar field with a non - standard dispersion relation that decreases exponentially at wave - numbers larger than planck scale ( ) . in this scenario , the energy density stored in the modes of trans - ...
1604.04672	i	let @xmath0 be a complex finite - dimensional semisimple lie algebra and @xmath5 be a reductive in @xmath0 subalgebra . admissible @xmath6-module _ is a @xmath0-module on which @xmath1 acts semisimply , locally finitely , and with finite multiplicities . the study of the category of admissible @xmath7-modules is a main...	let be a complex finite - dimensional semisimple lie algebra and be any-subalgebra of . in this paper we prove an earlier conjecture by penkov and zuckerman claiming that the first derived zuckerman functor provides an equivalence between a truncation of a thick parabolic category for and a truncation of the category o...	let be a complex finite - dimensional semisimple lie algebra and be any-subalgebra of . in this paper we prove an earlier conjecture by penkov and zuckerman claiming that the first derived zuckerman functor provides an equivalence between a truncation of a thick parabolic category for and a truncation of the category o...
1508.05424	i	phylogenetic networks have become increasingly more prominent in the literature as they correctly allow the evolution of certain collections of present - day species to be described with reticulation ( non - tree - like ) events . however , the evolution of a particular gene can generally be described without reticulat...	let be a finite set , be a reticulation - visible network on , and be a rooted binary phylogenetic tree . we show that there is a polynomial - time algorithm for deciding whether or not displays . furthermore , for all , we show that has at most vertices in total and at most reticulation vertices , and that these upper...	let be a finite set , be a reticulation - visible network on , and be a rooted binary phylogenetic tree . we show that there is a polynomial - time algorithm for deciding whether or not displays . furthermore , for all , we show that has at most vertices in total and at most reticulation vertices , and that these upper...
1409.4128	i	let @xmath2 be a real random variable having no atom at 0 , zero mean and unit variance . our object of study is the random polynomial @xmath7 where @xmath1 are iid copies of @xmath2 . this polynomial is often referred to as kac s polynomial , and has been extensively investigated in the literature . the study of real ...	let be a kac random polynomial where the coefficients are iid copies of a given random variable . our main result is an optimal quantitative bound concerning real roots repulsion . this leads to an optimal bound on the probability that there is a double root . as an application , we consider the problem of estimatin...	let be a kac random polynomial where the coefficients are iid copies of a given random variable . our main result is an optimal quantitative bound concerning real roots repulsion . this leads to an optimal bound on the probability that there is a double root . as an application , we consider the problem of estimatin...
1508.04577	i	in this paper we study the self - adjoint operator corresponding to the formal differential expression @xmath16 with the @xmath17-interaction supported on a non - closed piecewise-@xmath1 curve @xmath18 , which is either bounded with two free endpoints or unbounded with one free endpoint , here @xmath19 is called the s...	let be a non - closed piecewise- curve , which is either bounded with two free endpoints or unbounded with one free endpoint . let be the traces of a function in the sobolev space onto two faces of . we prove that for a wide class of shapes of the schrdinger operator with-interaction supported on of strength associated...	let be a non - closed piecewise- curve , which is either bounded with two free endpoints or unbounded with one free endpoint . let be the traces of a function in the sobolev space onto two faces of . we prove that for a wide class of shapes of the schrdinger operator with-interaction supported on of strength associated...
0803.2074	i	given a smooth real projective variety @xmath5 of dimension @xmath6 , we consider the topology of a connected component @xmath2 of the set @xmath1 of its real points . john nash proved in @xcite that any compact connected differentiable manifold @xmath2 is obtained in this way , and went over to ask whether the same wo...	let be a real smooth projective 3-fold fibred by rational curves . j. kollr proved that , if is orientable , then a connected component of is essentially either a seifert fibred manifold or a connected sum of lens spaces . our main theorem , answering in the affirmative three questions of kollr , gives sharp estima...	let be a real smooth projective 3-fold fibred by rational curves . j. kollr proved that , if is orientable , then a connected component of is essentially either a seifert fibred manifold or a connected sum of lens spaces . our main theorem , answering in the affirmative three questions of kollr , gives sharp estima...
0707.2427	i	let @xmath0 be a @xmath1-dimensional kleinian once - punctured ( or simply punctured ) torus group with accidental parabolic transformations , which acts on the riemann sphere @xmath7 as mbius transformations . in this paper , we regard @xmath0 as a @xmath8-dimensional kleinian group and study deformations @xmath4 of @...	let be a-dimensional kleinian punctured torus group with accidental parabolic transformations . the deformation space of in the group of mbius transformations on the-sphere is well - known as the maskit slice of punctured torus groups . in this paper , we study deformations of in the group of mbius transformations on t...	let be a-dimensional kleinian punctured torus group with accidental parabolic transformations . the deformation space of in the group of mbius transformations on the-sphere is well - known as the maskit slice of punctured torus groups . in this paper , we study deformations of in the group of mbius transformations on t...
0909.0053	i	the structure of a given graph can range in complexity from being quite simple , having some regular features or small edge and vertex sets to being extremely complicated where basic characteristics of the graph are hard to obtain or estimate . such complicated structure is typical if for instance the graph represents ...	let g be an arbitrary finite weighted digraph with weights in the set of complex rational functions . a general procedure is proposed which allows for the reduction of g to a smaller graph with a less complicated structure having the same spectrum as of g ( up to some set known in advance ) .	let g be an arbitrary finite weighted digraph with weights in the set of complex rational functions . a general procedure is proposed which allows for the reduction of g to a smaller graph with a less complicated structure having the same spectrum as of g ( up to some set known in advance ) . the proposed procedure has...
1404.5705	i	the erds - rnyi random graph @xcite is the simplest but probably the most important example of a random graph . in this graph , denoted by @xmath1 each pair of the @xmath2 vertices is connected with probability @xmath3 independently of other pairs . the phase transition phenomenon it exhibits has been greatly studied i...	let us consider a continuum analog of erds - rnyi random graphs , called the quantum random graphs . in these graphs , the vertices are replaced by circles punctured at poisson points of arrivals , and connections are derived through another poisson process on the circle . the quantum random graph is an instance of an ...	let us consider a continuum analog of erds - rnyi random graphs , called the quantum random graphs . in these graphs , the vertices are replaced by circles punctured at poisson points of arrivals , and connections are derived through another poisson process on the circle . the quantum random graph is an instance of an ...
1612.04493	i	magnetic reconnection is a basic plasma process often leading to the violent release of magnetic energy through rapid rearrangement of magnetic field geometry ( e.g. , * ? ? ? * ; * ? ? ? * ; * ? ? ? relativistic magnetic reconnection can occur when , as in many high - energy astrophysical environments , the magnetic e...	magnetic reconnection in relativistic collisionless plasmas can accelerate particles and power high - energy emission in various astrophysical systems . our key findings are : ( 1 ) the reconnection rate is about 0.1 of the alfvnic rate across all regimes ; ( 2 ) electrons can form concentrated moderately - relativisti...	magnetic reconnection in relativistic collisionless plasmas can accelerate particles and power high - energy emission in various astrophysical systems . whereas most previous studies focused on relativistic reconnection in pair plasmas , less attention has been paid to electron - ion plasma reconnection , expected in b...
1612.04493	c	in this paper , we performed a comprehensive numerical investigation of antiparallel ( no guide magnetic field ) collisionless relativistic magnetic reconnection in an electron - ion plasma , relevant to many astrophysical systems , such as coronae of accreting black holes in x - ray binaries and active galactic nuclei...	whereas most previous studies focused on relativistic reconnection in pair plasmas , less attention has been paid to electron - ion plasma reconnection , expected in black - hole accretion flows and relativistic jets . we investigate how the reconnection rate , electron and ion plasma flows , electric and magnetic fiel...	magnetic reconnection in relativistic collisionless plasmas can accelerate particles and power high - energy emission in various astrophysical systems . whereas most previous studies focused on relativistic reconnection in pair plasmas , less attention has been paid to electron - ion plasma reconnection , expected in b...
1305.6761	i	defects usually play a prominent role in various properties of a solid . for this reason , the physics and chemistry of defects have been the subjects of much study for several decades.@xcite many of these works focused mainly at the dilute limit , _ i.e. _ , with a small defect concentration . this is the case of inte...	making use of the energetics and equations of state of defective uranium dioxide that calculated with first - principles method , we demonstrate a possibility of constraining the formation energy of point defects by measuring the transition pressures of the corresponding pseudo - phase of defects . the mechanically sta...	making use of the energetics and equations of state of defective uranium dioxide that calculated with first - principles method , we demonstrate a possibility of constraining the formation energy of point defects by measuring the transition pressures of the corresponding pseudo - phase of defects . the mechanically sta...
1305.6761	c	a general formalism for the thermodynamics of defects in a crystal was derived based on the statistics of a grand canonical ensemble on a lattice . by introducing idle white atoms for vacancy and extending the sublattice of interstitial sites , this formalism has the same form as the lattice theory for alloys and compo...	it is a powerful tool to extract the defect energetics from finite defect concentrations to the dilute limit . besides these , the full content of the theoretical formalism and some relevant and interesting issues , including reentrant pseudo - transition , multi - defect coexistence , charged defects , and possible co...	making use of the energetics and equations of state of defective uranium dioxide that calculated with first - principles method , we demonstrate a possibility of constraining the formation energy of point defects by measuring the transition pressures of the corresponding pseudo - phase of defects . the mechanically sta...
astro-ph0310194	i	bars are one of the most prominent morphological features presented by disk galaxies ; eskridge ( 2000 ) find that more than two thirds of disk galaxies are either strongly or weakly barred in the near - infrared band . central mass concentrations ( cmcs ) are also frequently found in galaxies of all types , including ...	more than two thirds of disk galaxies are barred to some degree . many today harbor massive concentrations of gas in their centers , and some are known to possess supermassive black holes ( smbhs ) and their associated stellar cusps . we have varied the growth rate of the central mass , its final mass and degree of con...	more than two thirds of disk galaxies are barred to some degree . many today harbor massive concentrations of gas in their centers , and some are known to possess supermassive black holes ( smbhs ) and their associated stellar cusps . previous theoretical work has suggested that a bar in a galaxy could be dissolved by ...
astro-ph0310194	c	the experiments described here are rather artificial . we simply grow central masses in a pre - existing bar in order to learn how the bar is affected by cmcs having a range of properties . our intention was to isolate and understand a single aspect of the dynamics , with as few complications as possible . despite this...	previous theoretical work has suggested that a bar in a galaxy could be dissolved by the formation of a mass concentration in the center , although the precise mass and degree of central concentration required is not well - established . our main conclusions are : ( 1 ) bars are more robust than previously thought . th...	more than two thirds of disk galaxies are barred to some degree . many today harbor massive concentrations of gas in their centers , and some are known to possess supermassive black holes ( smbhs ) and their associated stellar cusps . previous theoretical work has suggested that a bar in a galaxy could be dissolved by ...
1508.00363	i	in summary , we have presented a theoretical study of dc transport in graphene driven into the hydrodynamic regime . as highlighted in ref . , this regime occurs in a wide range of temperatures and carrier concentrations . our theory , which applies only to the doped regime , relies on the continuity ( [ eq : contin...	we demonstrate analytically that measurements of non - local resistances in multi - terminal hall bar devices can be used to extract the hydrodynamic shear viscosity of the two - dimensional ( 2d ) electron liquid in graphene . we also discuss how to probe the viscosity - dominated hydrodynamic transport regime by scan...	motivated by recent experimental progress in preparing encapsulated graphene sheets with ultra - high mobilities up to room temperature , we present a theoretical study of dc transport in doped graphene in the hydrodynamic regime . by using the continuity and navier - stokes equations , we demonstrate analytically that...
1407.4125	i	iridium - based compounds@xcite have spurred considerable interest because the interplay of strong atomic spin - orbit coupling ( soc ) , electronic correlations , crystal field effects , and sizable orbital overlaps in these compounds have been shown to give rise to exotic states of matter ranging from topological ins...	motivated by recent experiments , we consider a generic spin model in the basis for the hyperhoneycomb and harmonic - honeycomb iridates . based on microscopic considerations , the effect of an additional bond - dependent anisotropic spin exchange interaction ( ) beyond the heisenberg - kitaev model is investigated the...	motivated by recent experiments , we consider a generic spin model in the basis for the hyperhoneycomb and harmonic - honeycomb iridates . based on microscopic considerations , the effect of an additional bond - dependent anisotropic spin exchange interaction ( ) beyond the heisenberg - kitaev model is investigated we ...
1209.6210	i	in a chemical reaction , the number of molecules involved can drastically vary from millions of moles a forest devastated by a fire to only a few reactions in a living cell . while most conventional chemical experiments were designed for a large ensemble in which only the average could be observed , chemistry textbo...	new advances in nano sciences open the door for scientists to study biological processes on a microscopic molecule - by - molecule basis . recent single - molecule biophysical experiments on enzyme systems , in particular , reveal that enzyme molecules behave fundamentally differently from what classical model predicts...	new advances in nano sciences open the door for scientists to study biological processes on a microscopic molecule - by - molecule basis . recent single - molecule biophysical experiments on enzyme systems , in particular , reveal that enzyme molecules behave fundamentally differently from what classical model predicts...
1406.0944	i	recent discoveries on multiple stellar populations in globular clusters ( gcs ) have revealed that some of these old stellar systems show chemical inhomogeneities , not just in the light elements involved in the hot h - burning , but also in heavier elements and in the overall metallicity . to explain the large metalli...	ngc1851 is surrounded by a stellar component that extends more than ten times beyond the tidal radius . we analyse the nature of this intriguing stellar component surrounding ngc1851 by investigating its radial velocities and chemical composition , in particular in comparison with those of the central cluster analysed ...	ngc1851 is surrounded by a stellar component that extends more than ten times beyond the tidal radius . although the nature of this stellar structure is not known , it has been suggested to be a sparse halo of stars or associated with a stellar stream . we analyse the nature of this intriguing stellar component surroun...
1406.0944	c	we have provided a spectroscopic analysis of the halo that surrounds ngc1851 . in particular we have studied the nature of this intriguing stellar structure by analysing rvs and elemental abundances , providing for the first time a chemical inventory in a halo surrounding a gc . we have measured radial velocities and e...	although the nature of this stellar structure is not known , it has been suggested to be a sparse halo of stars or associated with a stellar stream . we observed 23 stars in the halo with radial velocities consistent with ngc1851 , and for 15 of them we infer [ fe / h ] abundances . ( i ) _ stars dynamically linked to ...	ngc1851 is surrounded by a stellar component that extends more than ten times beyond the tidal radius . although the nature of this stellar structure is not known , it has been suggested to be a sparse halo of stars or associated with a stellar stream . we analyse the nature of this intriguing stellar component surroun...
1001.1483	i	binary pulsars with short orbital periods and massive companions exhibit a range of relativistic effects , the most prominent of which are relativistic periastron precession , gravitational time dilation , transverse doppler effects , orbit decay due to loss of energy to gravitational waves and the shapiro delay result...	observations of the binary pulsar psr j1141 using the parkes radio telescope over 9.3 years show clear time - variations in pulse width , shape and polarization . we interpret these variations in terms of relativistic precession of the pulsar spin axis about the total angular momentum vector of the system changing our ...	observations of the binary pulsar psr j1141 using the parkes radio telescope over 9.3 years show clear time - variations in pulse width , shape and polarization . we interpret these variations in terms of relativistic precession of the pulsar spin axis about the total angular momentum vector of the system changing our ...
1109.6846	i	this paper treats the problem of screening a @xmath3-variate sample for strongly and multiply connected vertices in the partial correlation graph associated with the the partial correlation matrix of the sample . this problem , called hub screening , is important in many applications ranging from network security to co...	one of the most important problems in large scale inference problems is the identification of variables that are highly dependent on several other variables . when dependency is measured by partial correlations these variables identify those rows of the partial correlation matrix that have several entries with magnitud...	one of the most important problems in large scale inference problems is the identification of variables that are highly dependent on several other variables . when dependency is measured by partial correlations these variables identify those rows of the partial correlation matrix that have several entries with magnitud...
1404.5569	i	the most famous algorithmic problem dealing with online assignment is arguably online bin packing . in this problem , known since the 1970s , items of size between @xmath3 and @xmath4 arrive in a sequence and the goal is to pack these items into the least number of unit - sized bins , packing each item as soon as it ar...	online bin stretchingis a semi - online variant of bin packing in which the algorithm has to use the same number of bins as an optimal packing , but is allowed to slightly overpack the bins . the goal is to minimize the amount of overpacking , i.e. , the maximum size packed into any bin . additionally , we present a...	online bin stretchingis a semi - online variant of bin packing in which the algorithm has to use the same number of bins as an optimal packing , but is allowed to slightly overpack the bins . the goal is to minimize the amount of overpacking , i.e. , the maximum size packed into any bin . we give an algorithm for on...
0704.1848	i	the compilations of various observational data show that the universe has entered the stage of an accelerated expansion around the redshift @xmath1 @xcite . the equation of state ( eos ) parameter @xmath2 of dark energy ( de ) responsible for the acceleration of the universe has been constrained to be close to @xmath0 ...	phantom fields with negative kinetic energy are often plagued by the vacuum quantum instability in the ultraviolet region . another interesting feature is a peculiar time - dependence of the effective newton s constant ; the magnitude of this effect is naturally small but may be close to experimental limits . we also d...	phantom fields with negative kinetic energy are often plagued by the vacuum quantum instability in the ultraviolet region . we present a lorentz - violating dark energy model free from this problem and show that the crossing of the cosmological constant boundary to the phantom equation of state is realized before reach...