publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2015-08-19 | Variations in solar wind fractionation as seen by ACE/SWICS over a solar cycle and the implications for Genesis Mission results | We use ACE/SWICS elemental composition data to compare the variations in
solar wind fractionation as measured by SWICS during the last solar maximum
(1999-2001), the solar minimum (2006-2009) and the period in which the Genesis
spacecraft was collecting solar wind (late 2001 - early 2004). We differentiate
our analysis... | 1508.04566v1 |
2015-08-28 | Cosmic variance in the nanohertz gravitational wave background | We use large N-body simulations and empirical scaling relations between dark
matter halos, galaxies, and supermassive black holes to estimate the formation
rates of supermassive black hole binaries and the resulting low-frequency
stochastic gravitational wave background (GWB). We find this GWB to be
relatively insensit... | 1508.07336v2 |
2015-09-01 | Magnon-driven longitudinal spin Seebeck effect in F|N and N|F|N structures: role of asymmetric in-plane magnetic anisotropy | The influence of an asymmetric in-plane magnetic anisotropy on the thermally
activated spin current is studied theoretically for two different systems; (i)
the system consisting of a ferromagnetic insulator in a direct contact with a
nonmagnetic metal, and the sandwich structure consisting of a ferromagnetic
insulating... | 1509.00376v1 |
2015-09-08 | Stellar Dynamics around a Massive Black Hole II: Resonant Relaxation | We present a first-principles theory of Resonant Relaxation (RR) of a low
mass stellar system orbiting a more massive black hole (MBH). We first extend
the kinetic theory of Gilbert (1968) to include the Keplerian field of a black
hole of mass $M_\bullet$. Specializing to a Keplerian stellar system of mass $M
\ll M_\bu... | 1509.02401v2 |
2015-10-11 | End-to-End Error-Correcting Codes on Networks with Worst-Case Symbol Errors | The problem of coding for networks experiencing worst-case symbol errors is
considered. We argue that this is a reasonable model for highly dynamic
wireless network transmissions. We demonstrate that in this setup prior network
error-correcting schemes can be arbitrarily far from achieving the optimal
network throughpu... | 1510.03060v1 |
2015-10-12 | Analysis of laser shock experiments on precompressed samples using a quartz reference and application to warm dense hydrogen and helium | Megabar (1 Mbar = 100 GPa) laser shocks on precompressed samples allow
reaching unprecedented high densities and moderately high 10000-100000K
temperatures. We describe here a complete analysis framework for the
velocimetry (VISAR) and pyrometry (SOP) data produced in these experiments.
Since the precompression increas... | 1510.03301v1 |
2015-11-09 | Simulations of the Pairwise Kinematic Sunyaev-Zel'dovich Signal | The pairwise kinematic Sunyaev-Zel'dovich (kSZ) signal from galaxy clusters
is a probe of their line-of-sight momenta, and thus a potentially valuable
source of cosmological information. In addition to the momenta, the amplitude
of the measured signal depends on the properties of the intra-cluster gas and
observational... | 1511.02843v2 |
2015-11-11 | Magnetization switching by current and microwaves | We propose a theoretical model of magnetization switching in a ferromagnetic
multilayer by both electric current and microwaves. The electric current gives
a spin transfer torque on the magnetization, while the microwaves induce a
precession of the magnetization around the initial state. Based on numerical
simulation o... | 1511.03366v2 |
2015-11-13 | Time-domain numerical modeling of brass instruments including nonlinear wave propagation, viscothermal losses, and lips vibration | A time-domain numerical modeling of brass instruments is proposed. On one
hand, outgoing and incoming waves in the resonator are described by the
Menguy-Gilbert model, which incorporates three key issues: nonlinear wave
propagation, viscothermal losses, and a variable section. The non-linear
propagation is simulated by... | 1511.04247v1 |
2015-11-24 | Planetary Candidates from the First Year of the K2 Mission | The Kepler Space Telescope is currently searching for planets transiting
stars along the ecliptic plane as part of its extended K2 mission. We processed
the publicly released data from the first year of K2 observations (Campaigns 0,
1, 2, and 3) and searched for periodic eclipse signals consistent with
planetary transi... | 1511.07820v2 |
2015-11-25 | A Search for Water in the Atmosphere of HAT-P-26b Using LDSS-3C | The characterization of a physically-diverse set of transiting exoplanets is
an important and necessary step towards establishing the physical properties
linked to the production of obscuring clouds or hazes. It is those planets with
identifiable spectroscopic features that can most effectively enhance our
understandin... | 1511.08226v2 |
2015-12-22 | Induced voltage in an open wire | A puzzle arising from Faraday's law is considered and solved concerning the
question which voltage is induced in an open wire with a time-varying
homogeneous magnetic field. In contrast to closed wires where the voltage is
determined by the time variance of magnetic field and enclosed area, in an open
wire we have to i... | 1512.07133v3 |
2015-12-22 | Charge transport and vector meson dissociation across the thermal phase transition in lattice QCD with two light quark flavors | We compute and analyze correlation functions in the isovector vector channel
at vanishing spatial momentum across the deconfinement phase transition in
lattice QCD. The simulations are carried out at temperatures $T/T_c=0.156, 0.8,
1.0, 1.25$ and $1.67$ with $T_c\simeq203$MeV for two flavors of Wilson-Clover
fermions w... | 1512.07249v1 |
2016-01-18 | Search for transiting exoplanets and variable stars in the open cluster NGC 7243 | We report results of the first five observing campaigns for the open stellar
cluster NGC 7243 in the frame of project Young Exoplanet Transit Initiative
(YETI). The project focuses on the monitoring of young and nearby stellar
clusters, with the aim to detect young transiting exoplanets, and to study
other variability ... | 1601.04562v1 |
2016-01-21 | Basker: A Threaded Sparse LU Factorization Utilizing Hierarchical Parallelism and Data Layouts | Scalable sparse LU factorization is critical for efficient numerical
simulation of circuits and electrical power grids. In this work, we present a
new scalable sparse direct solver called Basker. Basker introduces a new
algorithm to parallelize the Gilbert-Peierls algorithm for sparse LU
factorization. As architectures... | 1601.05725v1 |
2016-02-16 | JSJ decompositions of groups | This is an account of the theory of JSJ decompositions of finitely generated
groups, as developed in the last twenty years or so.
We give a simple general definition of JSJ decompositions (or rather of their
Bass-Serre trees), as maximal universally elliptic trees. In general, there is
no preferred JSJ decomposition,... | 1602.05139v2 |
2016-03-28 | Write error rate of spin-transfer-torque random access memory including micromagnetic effects using rare event enhancement | Spin-transfer-torque random access memory (STT-RAM) is a promising candidate
for the next-generation of random-access-memory due to improved scalability,
read-write speeds and endurance. However, the write pulse duration must be long
enough to ensure a low write error rate (WER), the probability that a bit will
remain ... | 1603.08512v2 |
2016-04-04 | Probing unconventional superconductivity in inversion symmetric doped Weyl semimetal | Unconventional superconductivity has been predicted to arise in the
topologically non-trivial Fermi surface of doped inversion symmetric Weyl
semimetals (WSM). In particular, Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) and
nodal BCS states are theoretically predicted to be possible superconductor
pairing states in inversio... | 1604.01040v1 |
2016-04-22 | Opt: A Domain Specific Language for Non-linear Least Squares Optimization in Graphics and Imaging | Many graphics and vision problems can be expressed as non-linear least
squares optimizations of objective functions over visual data, such as images
and meshes. The mathematical descriptions of these functions are extremely
concise, but their implementation in real code is tedious, especially when
optimized for real-ti... | 1604.06525v3 |
2016-05-06 | Spin orbit alignment for KELT-7b and HAT-P-56b via Doppler tomography with TRES | We present Doppler tomographic analyses for the spectroscopic transits of
KELT-7b and HAT-P-56b, two hot-Jupiters orbiting rapidly rotating F-dwarf host
stars. These include analyses of archival TRES observations for KELT-7b, and a
new TRES transit observation of HAT-P-56b. We report spin-orbit aligned
geometries for K... | 1605.01991v1 |
2016-06-18 | Mathematical Foundations of the GraphBLAS | The GraphBLAS standard (GraphBlas.org) is being developed to bring the
potential of matrix based graph algorithms to the broadest possible audience.
Mathematically the Graph- BLAS defines a core set of matrix-based graph
operations that can be used to implement a wide class of graph algorithms in a
wide range of progra... | 1606.05790v2 |
2016-07-15 | Influence of grain size and exchange interaction on the LLB modeling procedure | Reliably predicting bit-error rates in realistic heat-assisted magnetic
recording simulations is a challenging task. Integrating the
Landau-Lifshitz-Bloch (LLB) equation can reduce the computational effort to
determine the magnetization dynamics in the vicinity of the Curie temperature.
If one aims that these dynamics ... | 1607.04480v1 |
2016-08-23 | Thermal stability and irreversibility of skyrmion-lattice phases in Cu$_2$OSeO$_3$ | Small angle neutron scattering measurements have been performed to study the
thermodynamic stability of skyrmion-lattice phases in Cu$_2$OSeO$_3$. We found
that the two distinct skyrmion-lattice phases [SkX(1) and SkX(2) phases] can be
stabilized through different thermal histories; by cooling from the
paramagnetic pha... | 1608.06359v2 |
2016-08-24 | Carbon Stars in the Satellites and Halo of M31 | We spectroscopically identify a sample of carbon stars in the satellites and
halo of M31 using moderate-resolution optical spectroscopy from the
Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo survey. We
present the photometric properties of our sample of 41 stars, including their
brightness with re... | 1608.06714v1 |
2016-09-12 | Discovery and Precise Characterization by the MEarth Project of LP 661-13, an Eclipsing Binary Consisting of Two Fully Convective Low-mass Stars | We report the detection of stellar eclipses in the LP 661-13 system. We
present the discovery and characterization of this system, including high
resolution spectroscopic radial velocities and a photometric solution spanning
two observing seasons. LP 661-13 is a low mass binary system with an orbital
period of $4.70435... | 1609.03591v1 |
2016-09-14 | Topological superconductivity in an ultrathin, magnetically-doped topological insulator proximity coupled to a conventional superconductor | As a promising candidate system to realize topological superconductivity, the
system of a 3D topological insulator (TI) grown on top of the s-wave
superconductor has been extensively studied. To access the topological
superconductivity experimentally, the 3D TI sample must be thin enough to allow
for Cooper pair tunnel... | 1609.04129v2 |
2016-09-16 | Convex separation from convex optimization for large-scale problems | We present a scheme, based on Gilbert's algorithm for quadratic minimization
[SIAM J. Contrl., vol. 4, pp. 61-80, 1966], to prove separation between a point
and an arbitrary convex set $S\subset\mathbb{R}^{n}$ via calls to an oracle
able to perform linear optimizations over $S$. Compared to other methods, our
scheme ha... | 1609.05011v2 |
2016-09-18 | Narrowly distributed crystal orientation in biomineral vaterite | Biominerals formed by animals provide skeletal support, and many other
functions. They were previously shown to grow by aggregation of amorphous
nanoparticles, but never to grow ion-by-ion from solution, which is a common
growth mechanism for abiotic crystals. We analyze vaterite CaCO3 multi
crystalline spicules from t... | 1609.05449v1 |
2016-09-29 | Multiscale Model Approach for Magnetization Dynamics Simulations | Simulations of magnetization dynamics in a multiscale environment enable
rapid evaluation of the Landau-Lifshitz-Gilbert equation in a mesoscopic sample
with nanoscopic accuracy in areas where such accuracy is required. We have
developed a multiscale magnetization dynamics simulation approach that can be
applied to lar... | 1609.09295v1 |
2016-12-21 | Geometric generalised Lagrangian mean theories | Many fluctuation-driven phenomena in fluids can be analysed effectively using
the generalised Lagrangian mean (GLM) theory of Andrews & McIntyre (1978). This
theory relies on particle-following averaging to incorporate the constraints
imposed by the material conservations. It relies implicitly on an Euclidean
structure... | 1612.07111v3 |
2017-01-13 | A Multi-Planet System Transiting the $V$ = 9 Rapidly Rotating F-Star HD 106315 | We report the discovery of a multi-planet system orbiting HD 106315, a
rapidly rotating mid F-type star, using data from the K2 mission. HD 106315
hosts a $2.51\pm0.12\,R_\oplus$ sub-Neptune in a 9.5 day orbit, and a
$4.31_{-0.27}^{+0.24}\,R_\oplus$ super-Neptune in a 21 day orbit. The projected
rotational velocity of ... | 1701.03807v2 |
2017-01-17 | The Landau-Lifshitz equation, the NLS, and the magnetic rogue wave as a by-product of two colliding regular "positons" | In this article we present a new method for construction of exact solutions
of the Landau-Lifshitz-Gilbert equation (LLG) for ferromagnetic nanowires. The
method is based on the established relationship between the LLG and the
nonlinear Schr\"odinger equation (NLS), and is aimed at resolving an old
problem: how to prod... | 1701.04903v3 |
2017-01-24 | Partial Bridging of Vaccine Efficacy to New Populations | Suppose one has data from one or more completed vaccine efficacy trials and
wishes to estimate the efficacy in a new setting. Often logistical or ethical
considerations make running another efficacy trial impossible. Fortunately, if
there is a biomarker that is the primary modifier of efficacy, then the
biomarker-condi... | 1701.06739v1 |
2017-02-07 | Resonant spin transfer torque nano-oscillators | Spin transfer torque nano-oscillators are potential candidates for replacing
the traditional inductor based voltage controlled oscillators in modern
communication devices. Typical oscillator designs are based on trilayer
magnetic tunnel junctions which are disadvantaged by low power outputs and poor
conversion efficien... | 1702.01869v1 |
2017-03-17 | Communication Primitives in Cognitive Radio Networks | Cognitive radio networks are a new type of multi-channel wireless network in
which different nodes can have access to different sets of channels. By
providing multiple channels, they improve the efficiency and reliability of
wireless communication. However, the heterogeneous nature of cognitive radio
networks also brin... | 1703.06130v1 |
2017-03-22 | Magnetization induced dynamics of a Josephson junction coupled to a nanomagnet | We study the superconducting current of a Josephson junction (JJ) coupled to
an external nanomagnet driven by a time dependent magnetic field both without
and in the presence of an external AC drive. We provide an analytic, albeit
perturbative, solution for the Landau-Lifshitz (LL) equations governing the
coupled JJ-na... | 1703.07717v3 |
2017-04-19 | Integrating optimization with thermodynamics and plant physiology for crop ideotype design | A computational framework integrating optimization algorithms, parallel
computing and plant physiology was developed to explore crop ideotype design.
The backbone of the framework is a plant physiology model that accurately
tracks water use (i.e. a plant hydraulic model) coupled with mass transport
(CO2 exchange and tr... | 1704.05885v1 |
2017-04-28 | From deep inelastic scattering to heavy-flavor semi-leptonic decays: Total rates into multi-hadron final states from lattice QCD | We present a new technique for extracting decay and transition rates into
final states with any number of hadrons. The approach is only sensitive to
total rates, in which all out-states with a given set of QCD quantum numbers
are included. For processes involving photons or leptons, differential rates
with respect to t... | 1704.08993v2 |
2017-05-01 | Measuring galaxy cluster masses with CMB lensing using a Maximum Likelihood estimator: Statistical and systematic error budgets for future experiments | We develop a Maximum Likelihood estimator (MLE) to measure the masses of
galaxy clusters through the impact of gravitational lensing on the temperature
and polarization anisotropies of the cosmic microwave background (CMB). We show
that, at low noise levels in temperature, this optimal estimator outperforms
the standar... | 1705.00411v2 |
2017-05-03 | Current driven second harmonic domain wall resonance in ferromagnetic metal/ nonmagnetic metal bilayer: a field-free method for spin Hall angle measurements | We study the ac current-driven domain wall motion in bilayer ferromagnetic
metal (FM)/nonmagnetic metal (NM) nanowire. The solution of the modified
Landau-Lifshitz-Gilbert equation including all the spin transfer torques is
used to describe motion of the domain wall in presence of the spin Hall effect.
We show that the... | 1705.01355v5 |
2017-05-20 | SVM via Saddle Point Optimization: New Bounds and Distributed Algorithms | We study two important SVM variants: hard-margin SVM (for linearly separable
cases) and $\nu$-SVM (for linearly non-separable cases). We propose new
algorithms from the perspective of saddle point optimization. Our algorithms
achieve $(1-\epsilon)$-approximations with running time $\tilde{O}(nd+n\sqrt{d
/ \epsilon})$ f... | 1705.07252v4 |
2017-06-15 | On the Maximum Size of Block Codes Subject to a Distance Criterion | We establish a general formula for the maximum size of finite length block
codes with minimum pairwise distance no less than $d$. The achievability
argument involves an iterative construction of a set of radius-$d$ balls, each
centered at a codeword. We demonstrate that the number of such balls that cover
the entire co... | 1706.04709v2 |
2017-06-19 | Capability of Detecting Ultra-Violet Counterparts of Gravitational Waves with GLUV | With the discovery of gravitational waves (GW), attention has turned towards
detecting counterparts to these sources. In discussions on counterpart
signatures and multi-messenger follow-up strategies to GW detections,
ultra-violet (UV) signatures have largely been neglected, due to UV facilities
being limited to SWIFT,... | 1706.06106v2 |
2017-07-27 | LCD codes over ${\mathbb F}_q $ are as good as linear codes for q at least four | The hull $H(C)$ of a linear code $C$ is defined by $H(C)=C \cap C^\perp$. A
linear code with a complementary dual (LCD) is a linear code with $H(C)=\{0\}$.
The dimension of the hull of a code is an invariant under permutation
equivalence. For binary and ternary codes the dimension of the hull is also
invariant under mo... | 1707.08856v1 |
2017-08-04 | Energy release in the solar atmosphere from a stream of infalling prominence debris | Recent high-resolution and high-cadence EUV imaging has revealed a new
phenomenon, impacting prominence debris, where prominence material from failed
or partial eruptions can impact the lower atmosphere, releasing energy. We
report a clear example of energy release and EUV brightening due to infalling
prominence debris... | 1708.01555v2 |
2017-08-16 | Magneto Acoustic Spin Hall Oscillators | This paper introduces a novel oscillator that combines the tunability of spin
Hall-driven nano oscillators with the high quality factor (Q) of high overtone
bulk acoustic wave resonators (HBAR), integrating both reference and tunable
oscillators on the same chip with CMOS. In such magneto acoustic spin Hall
(MASH) osci... | 1708.04735v2 |
2017-09-01 | An order optimal policy for exploiting idle spectrum in cognitive radio networks | In this paper a spectrum sensing policy employing recency-based exploration
is proposed for cognitive radio networks. We formulate the problem of finding a
spectrum sensing policy for multi-band dynamic spectrum access as a stochastic
restless multi-armed bandit problem with stationary unknown reward
distributions. In ... | 1709.00237v1 |
2017-09-08 | EndoSensorFusion: Particle Filtering-Based Multi-sensory Data Fusion with Switching State-Space Model for Endoscopic Capsule Robots | A reliable, real time multi-sensor fusion functionality is crucial for
localization of actively controlled capsule endoscopy robots, which are an
emerging, minimally invasive diagnostic and therapeutic technology for the
gastrointestinal (GI) tract. In this study, we propose a novel multi-sensor
fusion approach based o... | 1709.03401v3 |
2017-09-12 | Distributed Scheduling in Time Dependent Environments: Algorithms and Analysis | Consider the problem of a multiple access channel in a time dependent
environment with a large number of users. In such a system, mostly due to
practical constraints (e.g., decoding complexity), not all users can be
scheduled together, and usually only one user may transmit at any given time.
Assuming a distributed, op... | 1709.04361v1 |
2017-09-16 | A differential memristive synapse circuit for on-line learning in neuromorphic computing systems | Spike-based learning with memristive devices in neuromorphic computing
architectures typically uses learning circuits that require overlapping pulses
from pre- and post-synaptic nodes. This imposes severe constraints on the
length of the pulses transmitted in the network, and on the network's
throughput. Furthermore, m... | 1709.05484v1 |
2017-09-21 | Impacts of Surface Depletion on the Plasmonic Properties of Doped Semiconductor Nanocrystals | Degenerately doped semiconductor nanocrystals (NCs) exhibit a localized
surface plasmon resonance (LSPR) in the infrared range of the electromagnetic
spectrum. Unlike metals, semiconductor NCs offer tunable LSPR characteristics
enabled by doping, or via electrochemical or photochemical charging. Tuning
plasmonic proper... | 1709.07136v2 |
2017-10-05 | Transport theory for femtosecond laser-induced spin-transfer torques | Ultrafast demagnetization of magnetic layers pumped by a femtosecond laser
pulse is accompanied by a nonthermal spin-polarized current of hot electrons.
These spin currents are studied here theoretically in a spin valve with
noncollinear magnetizations. To this end, we introduce an extended model of
superdiffusive spin... | 1710.02083v2 |
2017-10-12 | A critical comparison of methods for the determination of the ageing sensitivity in biomedical grade yttria stabilized zirconia | Since the recent failure events of two particular series of zirconia femoral
heads for total hip replacement prosthesis, a large decrease in the use of
zirconia ceramics for orthopaedic implants has been observed. In spite of the
biomedical success of this material during the last ten years, this was
required for safet... | 1710.04449v1 |
2017-10-26 | Evaluation of Treatment Effect Modification by Biomarkers Measured Pre- and Post-randomization in the Presence of Non-monotone Missingness | In vaccine studies, investigators are often interested in studying effect
modifiers of clinical treatment efficacy by biomarker-based principal strata,
which is useful for selecting biomarker study endpoints for evaluating
treatments in new trials, exploring biological mechanisms of clinical treatment
efficacy, and stu... | 1710.09923v1 |
2017-10-29 | If it ain't broke, don't fix it: Sparse metric repair | Many modern data-intensive computational problems either require, or benefit
from distance or similarity data that adhere to a metric. The algorithms run
faster or have better performance guarantees. Unfortunately, in real
applications, the data are messy and values are noisy. The distances between
the data points are ... | 1710.10655v1 |
2017-12-06 | Monitoring the orientation of rare-earth-doped nanorods for flow shear tomography | Rare-earth phosphors exhibit unique luminescence polarization features
originating from the anisotropic symmetry of the emitter ion's chemical
environment. However, to take advantage of this peculiar property, it is
necessary to control and measure the ensemble orientation of the host particles
with a high degree of pr... | 1712.02191v1 |
2017-12-08 | Shrewd Selection Speeds Surfing: Use Smart EXP3! | In this paper, we explore the use of multi-armed bandit online learning
techniques to solve distributed resource selection problems. As an example, we
focus on the problem of network selection. Mobile devices often have several
wireless networks at their disposal. While choosing the right network is vital
for good perf... | 1712.03038v3 |
2017-12-08 | Qatar Exoplanet Survey: Qatar-6b -- a grazing transiting hot Jupiter | We report the discovery of Qatar-6b, a new transiting planet identified by
the Qatar Exoplanet Survey (QES). The planet orbits a relatively bright
(V=11.44), early-K main-sequence star at an orbital period of P~3.506 days. An
SED fit to available multi-band photometry, ranging from the near-UV to the
mid-IR, yields a d... | 1712.03216v1 |
2018-01-25 | Generating survival times using Cox proportional hazards models with cyclic time-varying covariates, with application to a multiple-dose monoclonal antibody clinical trial | In two harmonized efficacy studies to prevent HIV infection through multiple
infusions of the monoclonal antibody VRC01, a key objective is to evaluate
whether the serum concentration of VRC01, which changes cyclically over time
along with the infusion schedule, is associated with the rate of HIV infection.
Simulation ... | 1801.08248v1 |
2018-01-29 | Band-pass superlattice magnetic tunnel junctions | Significant scientific and technological progress in the field of spintronics
is based on trilayer magnetic tunnel junction devices which principally rely on
the physics of single barrier tunneling. While technologically relevant devices
have been prototyped, the physics of single barrier tunneling poses ultimate
limit... | 1801.09409v2 |
2018-01-29 | Theory of AC quantum transport with fully electrodynamic coupling | With the continued scaling of microelectronic devices along with the growing
demand of high-speed wireless telecommunications technologies, there is
increasing need for high-frequency device modeling techniques that accurately
capture the quantum mechanical nature of charge transport in nanoscale devices
along with the... | 1801.09611v1 |
2018-02-17 | Design and Implementation of the Andromeda Proof Assistant | Andromeda is an LCF-style proof assistant where the user builds derivable
judgments by writing code in a meta-level programming language AML. The only
trusted component of Andromeda is a minimalist nucleus (an implementation of
the inference rules of an object-level type theory), which controls
construction and decompo... | 1802.06217v1 |
2018-03-02 | Broadband spectroscopy of thermodynamic magnetization fluctuations through a ferromagnetic spin-reorientation transition | We use scanning optical magnetometry to study the broadband frequency spectra
of spontaneous magnetization fluctuations, or "magnetization noise", in an
archetypal ferromagnetic film that can be smoothly tuned through a spin
reorientation transition (SRT). The SRT is achieved by laterally varying the
magnetic anisotrop... | 1803.00962v1 |
2018-03-06 | On Simple Back-Off in Unreliable Radio Networks | In this paper, we study local and global broadcast in the dual graph model,
which describes communication in a radio network with both reliable and
unreliable links. Existing work proved that efficient solutions to these
problems are impossible in the dual graph model under standard assumptions. In
real networks, howev... | 1803.02216v3 |
2018-04-12 | Connectivity in Random Annulus Graphs and the Geometric Block Model | We provide new connectivity results for {\em vertex-random graphs} or {\em
random annulus graphs} which are significant generalizations of random
geometric graphs. Random geometric graphs (RGG) are one of the most basic
models of random graphs for spatial networks proposed by Gilbert in 1961,
shortly after the introduc... | 1804.05013v3 |
2018-04-19 | Equilibrium magnetization of a quasispherical cluster of single-domain particles | Equilibrium magnetization curve of a rigid finite-size spherical cluster of
single-domain particles is investigated both numerically and analytically. The
spatial distribution of particles within the cluster is random. Dipole-dipole
interactions between particles are taken into account. The particles are
monodisperse. ... | 1804.07196v2 |
2018-05-28 | Starbug fibre positioning robots: performance and reliability enhancements | Starbugs are miniature piezoelectric walking robots that can be operated in
parallel to position many payloads like optical fibers across a telescopes
focal plane. They consist of two concentric piezoelectric ceramic tubes that
walk with micron step size. In addition to individual optical fibers, Starbugs
have moved a ... | 1805.10761v1 |
2018-06-14 | Resolving interfacial charge transfer in titanate superlattices using resonant X-ray reflectometry | Charge transfer in oxide heterostructures can be tuned to promote emergent
interfacial states, and accordingly, has been the subject of intense study in
recent years. However, accessing the physics at these interfaces, which are
often buried deep below the sample surface, remains difficult. Addressing this
challenge re... | 1806.05733v1 |
2018-06-18 | Formation Timescales for High-Mass X-ray Binaries in M33 | We have identified 55 candidate high-mass X-ray binaries (HMXBs) in M33 using
available archival {\it HST} and {\it Chandra} imaging to find blue stars
associated with X-ray positions. We use the {\it HST} photometric data to model
the color-magnitude diagrams in the vicinity of each candidate HMXB to measure
a resolve... | 1806.06863v1 |
2018-06-24 | Nanoscopic time crystal obtained by nonergodic spin dynamics | We study the far-from-equilibrium properties of quenched magnetic nanoscopic
classical spin systems. In particular, we focus on the interplay between
lattice vibrations and magnetic frustrations induced by surface effects typical
of an antiferromagnet. We use a combination of Monte Carlo simulations and
explore the dyn... | 1806.09130v4 |
2018-06-29 | The warm Neptunes around HD 106315 have low stellar obliquities | We present the obliquity of the warm Neptune HD 106315c measured via a series
of spectroscopic transit observations. HD 106315c is a 4.4 REarth warm Neptune
orbiting a moderately rotating late F-star with a period of 21.05 days. HD
106315 also hosts a 2.5 REarth super-Earth on a 9.55 day orbit. Our Doppler
tomographic ... | 1807.00024v1 |
2018-07-13 | BFORE: A CMB Balloon Payload to Measure Reionization, Neutrino Mass, and Cosmic Inflation | BFORE is a high-altitude ultra-long-duration balloon mission to map the
cosmic microwave background (CMB). During a 28-day mid-latitude flight launched
from Wanaka, New Zealand, the instrument will map half the sky to improve
measurements of the optical depth to reionization tau. This will break
parameter degeneracies ... | 1807.05215v1 |
2018-07-19 | Magnetization nutation induced by surface effects in nanomagnets | We investigate the magnetization dynamics of ferromagnetic nanoparticles in
the atomistic approach taking account of surface anisotropy and the spin
misalignment it causes. We demonstrate that such inhomogeneous spin
configurations induce nutation in the dynamics of the particle's magnetization.
More precisely, in addi... | 1807.07392v1 |
2018-07-19 | Unsupervised Metric Learning in Presence of Missing Data | For many machine learning tasks, the input data lie on a low-dimensional
manifold embedded in a high dimensional space and, because of this
high-dimensional structure, most algorithms are inefficient. The typical
solution is to reduce the dimension of the input data using standard dimension
reduction algorithms such as... | 1807.07610v3 |
2018-08-09 | Four new eclipsing mid M-dwarf systems from the New Luyten Two Tenths catalog | Using data from the MEarth-North and MEarth-South transit surveys, we present
the detection of eclipses in four mid M-dwarf systems: LP 107-25, LP 261-75, LP
796-24, and LP 991-15. Combining the MEarth photometry with spectroscopic
follow-up observations, we show that LP 107-25 and LP 796-24 are short-period
(1.388 and... | 1808.03243v1 |
2018-08-14 | Addressing Johnson graphs, complete multipartite graphs, odd cycles and other graphs | Graham and Pollak showed that the vertices of any graph $G$ can be addressed
with $N$-tuples of three symbols, such that the distance between any two
vertices may be easily determined from their addresses. An addressing is
optimal if its length $N$ is minimum possible.
In this paper, we determine an addressing of len... | 1808.04757v2 |
2018-09-26 | On Bioelectric Algorithms: A Novel Application of Theoretical Computer Science to Core Problems in Developmental Biology | Cellular bioelectricity describes the biological phenomenon in which cells in
living tissue generate and maintain patterns of voltage gradients induced by
differing concentrations of charged ions. A growing body of research suggests
that bioelectric patterns represent an ancient system that plays a key role in
guiding ... | 1809.10046v1 |
2018-10-02 | Floquet engineering of classical systems | We develop the Floquet-Magnus expansion for a classical equation of motion
under a periodic drive that is applicable to both isolated and open systems.
For classical systems, known approaches based on the Floquet theorem fail due
to the nonlinearity and the stochasticity of their equations of motion (EOMs)
in contrast ... | 1810.01103v2 |
2018-10-02 | Geodesic motion on the groups of diffeomorphisms with $H^1$ metric as geometric generalised Lagrangian mean theory | Generalized Lagrangian mean theories are used to analyze the interactions
between mean flows and fluctuations, where the decomposition is based on a
Lagrangian description of the flow. A systematic geometric framework was
recently developed by Gilbert and Vanneste (J. Fluid Mech., 2018) who cast the
decomposition in te... | 1810.01377v1 |
2018-10-07 | Training Convolutional Neural Networks and Compressed Sensing End-to-End for Microscopy Cell Detection | Automated cell detection and localization from microscopy images are
significant tasks in biomedical research and clinical practice. In this paper,
we design a new cell detection and localization algorithm that combines deep
convolutional neural network (CNN) and compressed sensing (CS) or sparse coding
(SC) for end-to... | 1810.03075v1 |
2018-11-16 | Asymmetric Drift in the Andromeda Galaxy (M31) as a Function of Stellar Age | We analyze the kinematics of Andromeda's disk as a function of stellar age by
using photometry from the Panchromatic Hubble Andromeda Treasury (PHAT) survey
and spectroscopy from the Spectroscopic and Photometric Landscape of
Andromeda's Stellar Halo (SPLASH) survey. We use HI 21-cm and CO ($\rm J=1
\rightarrow 0$) dat... | 1811.07037v2 |
2018-11-21 | Exploring interfacial exchange coupling and sublattice effect in heavy metal/ferrimagnetic insulator heterostructures using Hall measurements, x-ray magnetic circular dichroism, and neutron reflectometry | We use temperature-dependent Hall measurements to identify contributions of
spin Hall, magnetic proximity, and sublattice effects to the anomalous Hall
signal in heavy metal/ferrimagnetic insulator heterostructures with
perpendicular magnetic anisotropy. This approach enables detection of both the
magnetic proximity ef... | 1811.08574v2 |
2018-12-13 | Qatar Exoplanet Survey: Qatar-7b -- A Very Hot Jupiter Orbiting a Metal Rich F-Star | We present the discovery of Qatar-7b --- a very hot and inflated giant gas
planet orbiting close its parent star. The host star is a relatively massive
main sequence F-star with mass and radius Mstar = 1.41 +/- 0.03 Msun and Rstar
= 1.56 +/- 0.02 Rsun, respectively, at a distance d = 726 +/- 26 pc, and an
estimated age... | 1812.05601v1 |
2019-01-02 | Leader Election in Well-Connected Graphs | In this paper, we look at the problem of randomized leader election in
synchronous distributed networks with a special focus on the message
complexity. We provide an algorithm that solves the implicit version of leader
election (where non-leader nodes need not be aware of the identity of the
leader) in any general netw... | 1901.00342v1 |
2019-01-23 | Cooperation Speeds Surfing: Use Co-Bandit! | In this paper, we explore the benefit of cooperation in adversarial bandit
settings. As a motivating example, we consider the problem of wireless network
selection. Mobile devices are often required to choose the right network to
associate with for optimal performance, which is non-trivial. The excellent
theoretical pr... | 1901.07768v1 |
2019-01-31 | Still out there: Modeling and Identifying Russian Troll Accounts on Twitter | There is evidence that Russia's Internet Research Agency attempted to
interfere with the 2016 U.S. election by running fake accounts on Twitter -
often referred to as "Russian trolls". In this work, we: 1) develop machine
learning models that predict whether a Twitter account is a Russian troll
within a set of 170K con... | 1901.11162v1 |
2019-02-11 | Efficient Randomized Test-And-Set Implementations | We study randomized test-and-set (TAS) implementations from registers in the
asynchronous shared memory model with n processes. We introduce the problem of
group election, a natural variant of leader election, and propose a framework
for the implementation of TAS objects from group election objects. We then
present two... | 1902.04002v1 |
2019-03-11 | Evidence for the formation of nanoprecipitates with magnetically disordered regions in bulk $\mathrm{Ni}_{50}\mathrm{Mn}_{45}\mathrm{In}_{5}$ Heusler alloys | Shell ferromagnetism is a new functional property of certain Heusler alloys
which has been recently observed in
$\mathrm{Ni}_{50}\mathrm{Mn}_{45}\mathrm{In}_{5}$. We report the results of a
comparative study of the magnetic microstructure of bulk
$\mathrm{Ni}_{50}\mathrm{Mn}_{45}\mathrm{In}_{5}$ Heusler alloys using
ma... | 1903.04183v1 |
2019-03-14 | Low Field-size, Rate-Optimal Streaming Codes for Channels With Burst and Random Erasures | In this paper, we design erasure-correcting codes for channels with burst and
random erasures, when a strict decoding delay constraint is in place. We
consider the sliding-window-based packet erasure model proposed by Badr et al.,
where any time-window of width $w$ contains either up to $a$ random erasures or
an erasur... | 1903.06210v1 |
2019-03-21 | Emergent topology and symmetry-breaking order in correlated quench dynamics | Quenching a quantum system involves three basic ingredients: the initial
phase, the post-quench target phase, and the non-equilibrium dynamics which
carries the information of the former two. Here we propose a dynamical theory
to characterize both the topology and symmetry-breaking order in correlated
quantum system, t... | 1903.09144v3 |
2019-03-22 | Advanced Non-Destructive in Situ Characterization of Metals with the French Collaborating Research Group D2AM/BM02 Beamline at the European Synchrotron Radiation Facility | The ability to non-destructively measure the structural properties of
devices, either in situ or operando, are now possible using an intense X-ray
synchrotron source combined with specialized equipment. This tool attracted
researchers, in particular metallurgists, to attempt more complex and ambitious
experiments aimed... | 1903.09390v1 |
2019-03-31 | Relaxation to equilibrium in models of classical spins with long-range interactions | For a model long-range interacting system of classical Heisenberg spins, we
study how fluctuations, such as those arising from having a finite system size
or through interaction with the environment, affect the dynamical process of
relaxation to Boltzmann-Gibbs equilibrium. Under deterministic spin
precessional dynamic... | 1904.00432v2 |
2019-04-27 | Blue-Light-Emitting Color Centers in High-Quality Hexagonal Boron Nitride | Light emitters in wide band gap semiconductors are of great fundamental
interest and have potential as optically addressable qubits. Here we describe
the discovery of a new color center in high-quality hexagonal boron nitride
(h-BN) with a sharp emission line at 435 nm. The emitters are activated and
deactivated by ele... | 1904.12107v6 |
2019-04-30 | Realization of Ordered Magnetic Skyrmions in Thin Films at Ambient Conditions | Magnetic skyrmions present interesting physics due to their topological
nature and hold significant promise for future information technologies. A key
barrier to realizing skyrmion devices has been stabilizing these spin
structures under ambient conditions. In this manuscript, we exploit the tunable
magnetic properties... | 1904.13274v1 |
2019-05-16 | Ultralow-loss domain wall motion driven by magnetocrystalline anisotropy gradient in antiferromagnetic nanowire | Searching for new methods controlling antiferromagnetic (AFM) domain wall is
one of the most important issues for AFM spintronic device operation. In this
work, we study theoretically the domain wall motion of an AFM nanowire, driven
by the axial anisotropy gradient generated by external electric field, allowing
the el... | 1905.06695v2 |
2019-05-22 | Constraining level densities using spectral data | Several models of level densities exist and they often make simplified
assumptions regarding the overall behavior of the total level densities (LD)
and the intrinsic spin and parity distributions of the excited states.
Normally, such LD models are constrained only by the measured $D_0$, i.e. the
density of levels at th... | 1905.09194v1 |
2019-05-23 | The Kepler Smear Campaign: Light curves for 102 Very Bright Stars | We present the first data release of the Kepler Smear Campaign, using
collateral 'smear' data obtained in the Kepler four-year mission to reconstruct
light curves of 102 stars too bright to have been otherwise targeted. We
describe the pipeline developed to extract and calibrate these light curves,
and show that we att... | 1905.09831v1 |
2019-06-06 | A Hot Saturn Near (but unassociated with) the Open Cluster NGC 1817 | We report on the discovery of a hot Saturn-sized planet (9.916 +/- 0.985
R_earth) around a late F star, EPIC 246865365, observed in Campaign 13 of the
K2 mission. We began studying this planet candidate because prior to the
release of Gaia DR2, the host star was thought to have been a member (> 90%
membership probabili... | 1906.02395v1 |
2019-06-12 | Towards the nucleon hadronic tensor from lattice QCD | We present the first calculation of the hadronic tensor on the lattice for
the nucleon. The hadronic tensor can be used to extract the structure functions
in deep inelastic scatterings and also provide information for the
neutrino-nucleon scattering which is crucial to the neutrino-nucleus scattering
experiments at low... | 1906.05312v1 |
2019-06-17 | Non-equilibrium Green's Function and First Principle Approach to Modeling of Multiferroic Tunnel Junctions | Recently, multiferroic tunnel junctions (MFTJs) have gained significant
spotlight in the literature due to its high tunneling electro-resistance
together with its non-volatility. In order to analyze such devices and to have
insightful understanding of its characteristics, there is a need for developing
a multi-physics ... | 1906.06986v1 |
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