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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1,500 |
2007.08290
|
Annette Huber
|
Johan Commelin, Annette Huber
|
Exponential periods and o-minimality II
|
The paper was merged with part I. See arXiv:2007.08280 for updates
| null | null | null |
math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper is a sequel to "Exponential periods and o-minimality I" that the
authors wrote together with Philipp Habegger. We complete the comparison
between different definitions of exponential periods, and show that they all
lead to the same notion. In the first paper, we show that naive exponential
periods are absolutely convergent exponential periods. We also show that naive
exponential periods are up to signs volumes of definable sets in the o-minimal
structure generated by $\mathbb{Q}$, the real exponential function and
${\sin}|_{[0,1]}$.
In this paper, we compare these definitions with cohomological exponential
periods and periods of exponential Nori motives. In particular, naive
exponential periods are the same as periods of exponential Nori motives, which
justifies that the definition of naive exponential periods singles out the
correct set of complex numbers to be called exponential periods.
|
[{'version': 'v1', 'created': 'Thu, 16 Jul 2020 12:26:45 GMT'}
{'version': 'v2', 'created': 'Thu, 31 Mar 2022 06:47:22 GMT'}]
|
2022-04-01
|
[array(['Commelin', 'Johan', ''], dtype=object)
array(['Huber', 'Annette', ''], dtype=object)]
|
1,501 |
2207.05649
|
Sujit Datta
|
Christopher A. Browne, Richard B. Huang, Callie W. Zheng, Sujit S.
Datta
|
Elastic turbulence homogenizes fluid transport in stratified porous
media
| null | null | null | null |
physics.flu-dyn cond-mat.dis-nn cond-mat.soft nlin.CD physics.app-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many key environmental, industrial, and energy processes rely on controlling
fluid transport within subsurface porous media. These media are typically
structurally heterogeneous, often with vertically-layered strata of distinct
permeabilities -- leading to uneven partitioning of flow across strata, which
can be undesirable. Here, using direct in situ visualization, we demonstrate
that polymer additives can homogenize this flow by inducing a purely-elastic
flow instability that generates random spatiotemporal fluctuations and excess
flow resistance in individual strata. In particular, we find that this
instability arises at smaller imposed flow rates in higher-permeability strata,
diverting flow towards lower-permeability strata and helping to homogenize the
flow. Guided by the experiments, we develop a parallel-resistor model that
quantitatively predicts the flow rate at which this homogenization is optimized
for a given stratified medium. Thus, our work provides a new approach to
homogenizing fluid and passive scalar transport in heterogeneous porous media.
|
[{'version': 'v1', 'created': 'Tue, 12 Jul 2022 16:28:27 GMT'}]
|
2022-07-13
|
[array(['Browne', 'Christopher A.', ''], dtype=object)
array(['Huang', 'Richard B.', ''], dtype=object)
array(['Zheng', 'Callie W.', ''], dtype=object)
array(['Datta', 'Sujit S.', ''], dtype=object)]
|
1,502 |
2301.02927
|
William Black
|
William K. Black, Rebecca L. Matz, Mark Mills, and A. E. Evrard
|
Practice Makes Better: Quantifying Grade Benefits of Study
|
Accepted for publication in Physical Review Physics Education
Research; 13 pages, 8 figures
| null | null | null |
physics.ed-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Problem Roulette (PR), an online study service at the University of Michigan,
offers points-free formative practice to students preparing for examinations in
introductory STEM courses. Using four years of PR data involving millions of
problem attempts by thousands of students, we quantify benefits of increased
practice study volume in introductory physics. After conditioning mean final
grade on standardized (ACT/SAT) math test score, we analyze deviations based on
student study volume. We find a strong effect; mean course grade rises
quadratically with the logarithm of the total number of PR questions
encountered over the term ($N_{\rm Q,tot}$), with an overall gain of $0.77 \pm
0.12$ grade points between $1 < N_{\rm Q,tot} < 1000$. The gains are persistent
across the range of math test score represented in our sample. While $N_{\rm
Q,tot}$ surely correlates with other study habits, the benefits of increased
study in general still hold. A model for final grade using test score and study
volume largely accounts for demographic stratification, including by sex,
parental education level, number of parents at home, nationality /
underrepresented minority status, and regional income level, with two
significant exceptions: students whose parents did not earn a college degree,
who earn $-0.27 \pm 0.04$ grade points ($6.1\sigma$) below expectations and
underrepresented minority students at $-0.14 \pm 0.04$ points ($3.6\sigma$).
Residual scatter in final grade remains comparable to the maximal study gains,
implying that the model is far from deterministic: individual variation trumps
mean trends. Our findings can help motivate students to study more and help
teachers to identify which types of students may especially need such
encouragement.
|
[{'version': 'v1', 'created': 'Sat, 7 Jan 2023 19:38:29 GMT'}
{'version': 'v2', 'created': 'Sat, 29 Apr 2023 14:29:13 GMT'}]
|
2023-05-02
|
[array(['Black', 'William K.', ''], dtype=object)
array(['Matz', 'Rebecca L.', ''], dtype=object)
array(['Mills', 'Mark', ''], dtype=object)
array(['Evrard', 'A. E.', ''], dtype=object)]
|
1,503 |
astro-ph/0105551
|
Deepak Jain
|
Deepak Jain, Abha Dev, N. Panchapakesan, S. Mahajan and V. B. Bhatia
(University of Delhi, India)
|
Gravitational lensing constraint on the cosmic equation of state
|
Modified results and inclusion of calculations with new set of
parameters
|
Int.J.Mod.Phys. D12 (2003) 953
|
10.1142/S0218271803003062
| null |
astro-ph
| null |
Recent redshift-distance measurements of Type Ia supernovae (SNe Ia) at
cosmological distances suggest that two-third of the energy density of the
universe is dominated by dark energy component with an effective negative
pressure. This dark energy component is described by the equation of state
$p_{x} = w \rho_{x}$ $(w \geq -1)$. We use gravitational lensing statistics to
constrain the equation of state of this dark energy. We use $n(\Delta\theta)$,
image separation distribution function of lensed quasars, as a tool to probe
$w$. We find that for the observed range of $\Omega_m \sim 0.2 - 0.4$, $w$
should lie between $-0.8 \leq w \leq -0.4$ in order to have five lensed quasars
in a sample of 867 optical quasars. This limit is highly sensitive to lens and
Schechter parameters and evolution of galaxies.
|
[{'version': 'v1', 'created': 'Thu, 31 May 2001 10:05:01 GMT'}
{'version': 'v2', 'created': 'Tue, 4 Jun 2002 11:14:11 GMT'}]
|
2009-11-06
|
[array(['Jain', 'Deepak', '', 'University of Delhi, India'], dtype=object)
array(['Dev', 'Abha', '', 'University of Delhi, India'], dtype=object)
array(['Panchapakesan', 'N.', '', 'University of Delhi, India'],
dtype=object)
array(['Mahajan', 'S.', '', 'University of Delhi, India'], dtype=object)
array(['Bhatia', 'V. B.', '', 'University of Delhi, India'], dtype=object)]
|
1,504 |
quant-ph/0208141
|
Peter Foldi
|
Peter Foldi, Mihaly G. Benedict, Attila Czirjak, Balazs Molnar
|
Decoherence of molecular wave packets in an anharmonic potential
|
7 pages, 4 figures
| null |
10.1103/PhysRevA.67.032104
| null |
quant-ph
| null |
The time evolution of anharmonic molecular wave packets is investigated under
the influence of the environment consisting of harmonic oscillators. These
oscillators represent photon or phonon modes and assumed to be in thermal
equilibrium. Our model explicitly incorporates the fact that in the case of a
nonequidistant spectrum the rates of the environment induced transitions are
different for each transition. The nonunitary time evolution is visualized by
the aid of the Wigner function related to the vibrational state of the
molecule. The time scale of decoherence is much shorter than that of
dissipation, and gives rise to states which are mixtures of localized states
along the phase space orbit of the corresponding classical particle. This
behavior is to a large extent independent of the coupling strength, the
temperature of the environment and also of the initial state.
|
[{'version': 'v1', 'created': 'Thu, 22 Aug 2002 12:20:32 GMT'}]
|
2015-06-26
|
[array(['Foldi', 'Peter', ''], dtype=object)
array(['Benedict', 'Mihaly G.', ''], dtype=object)
array(['Czirjak', 'Attila', ''], dtype=object)
array(['Molnar', 'Balazs', ''], dtype=object)]
|
1,505 |
1806.04176
|
Raymond Mortini
|
Raymond Mortini and Joseph Cima
|
One-component inner functions II
|
9 pages, 1 figure
| null | null | null |
math.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We continue our study of the set $\mathfrak I_c$ of inner functions $u$ in
$H^\infty$ with the property that there is $\eta\in ]0,1[$ such that the level
set $\Omega_u(\eta):=\{z\in\mathbb D: |u(z)|<\eta\}$ is connected. These
functions are called one-component inner functions. They play an important role
in function theory and operator theory. Here we show that the composition of
two one-component inner functions is again in $\mathfrak I_c$. We also give
conditions under which a factor of one-component inner function belongs to
$\mathfrak I_c$.
|
[{'version': 'v1', 'created': 'Mon, 11 Jun 2018 18:33:23 GMT'}]
|
2018-06-13
|
[array(['Mortini', 'Raymond', ''], dtype=object)
array(['Cima', 'Joseph', ''], dtype=object)]
|
1,506 |
2109.08676
|
Natalie Hogg
|
Natalie B. Hogg, Marco Bruni
|
Shan--Chen interacting vacuum cosmology
|
14 pages, 11 figures. Results and discussion updated to match version
published in MNRAS. Short appendix with extra results added
| null |
10.1093/mnras/stac324
|
IFT-UAM/CSIC-21-99
|
astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we introduce a novel class of interacting vacuum models, based
on recasting the equation of state originally developed in the context of
lattice kinetic theory by Shan \& Chen as the coupling between the vacuum and
cold dark matter (CDM). This coupling allows the vacuum to evolve and is
nonlinear around a characteristic energy scale $\rho_*$, changing into a linear
coupling with a typical power law evolution at scales much lower and much
higher than $\rho_*$. Focusing on the simplest sub-class of models where the
interaction consists only of an energy exchange and the CDM remains geodesic,
we first illustrate the various possible models that can arise from the
Shan--Chen coupling, with several different behaviours at both early and late
times depending on the values of the model parameters selected. We then place
the first observational constraints on this Shan--Chen interacting vacuum
scenario, performing an MCMC analysis to find those values of the model and
cosmological parameters which are favoured by observational data. We focus on
models where the nonlinearity of the coupling is relevant at late times,
choosing for the reference energy scale $\rho_*$, the critical energy density
in $\Lambda$CDM. We show that the observational data we use are compatible with
a wide range of models which result in different cosmologies. However, we also
show that $\Lambda$CDM is preferred over all of the Shan--Chen interacting
vacuum models that we study, and comment on the inability of these models to
relax the $H_0$ and $\sigma_8$ tensions.
|
[{'version': 'v1', 'created': 'Fri, 17 Sep 2021 17:57:03 GMT'}
{'version': 'v2', 'created': 'Mon, 28 Feb 2022 11:10:31 GMT'}]
|
2022-03-01
|
[array(['Hogg', 'Natalie B.', ''], dtype=object)
array(['Bruni', 'Marco', ''], dtype=object)]
|
1,507 |
1601.00968
|
Anton Burkov
|
I. Panfilov, A. Patri, Kun Yang, A.A. Burkov
|
Chiral spin liquid from magnetic Wannier states
|
6+ pages, 2 figures, added references, published version
|
Phys. Rev. B 93, 125126 (2016)
|
10.1103/PhysRevB.93.125126
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a mapping of a two-dimensional system of interacting bosons in a
strong perpendicular magnetic field to an equivalent system of interacting
bosons on the square lattice in the absence of the field. The mapping utilizes
a magnetic Bloch and the corresponding magnetic Wannier single-particle basis
in the lowest Landau level. By construction, the ground states of the resulting
model of interacting bosons on the square lattice are gapped fractionalized
liquids or gapless Bose metal states with broken time reversal symmetry at
specific rational filling fractions.
|
[{'version': 'v1', 'created': 'Tue, 5 Jan 2016 21:00:03 GMT'}
{'version': 'v2', 'created': 'Fri, 8 Jan 2016 14:26:49 GMT'}
{'version': 'v3', 'created': 'Thu, 24 Mar 2016 20:53:02 GMT'}]
|
2016-03-28
|
[array(['Panfilov', 'I.', ''], dtype=object)
array(['Patri', 'A.', ''], dtype=object)
array(['Yang', 'Kun', ''], dtype=object)
array(['Burkov', 'A. A.', ''], dtype=object)]
|
1,508 |
2303.01044
|
Mamta Aggarwal Dr.
|
Mamta Aggarwal
|
Impact of the quenching of shell effects with excitation energy on
Nuclear Level Density
|
11 pages 15 figures
| null |
10.1016/j.nuclphysa.2023.122619
| null |
nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the nature and impact of shell effects on nuclear level
density (NLD) and particle emission probability as a function of temperature in
a microscopic theoretical framework of Statistical Model for nuclei ranging
from neutron deficient to neutron rich isotopes of Z$=$ 27$-$35. Critical
temperatures are traced for neighbouring even, odd, closed shell and
mid$-$shell nuclei which respond to excitations differently due to their
varying stability and structural effects. Importance of the shell effects and
shell correction energy is reflected significantly in NLD variation which
slowly diminishes with increasing excitation energy indicating the quenching of
shell effects. The enhancement of LD parameter with the deformation and
rotation and the fade out of enhancement with increasing excitations has been
shown. The weakening of magicity of N$=$28 near the proton drip line has been
observed in the inverse level density parameter 'K'($=$ A/a) and $\beta$
variation though it is usually uncommon to see this effect in excited nuclei.
Variation of our calculated NLD for odd $^{69}$As and even $^{70}$Ge exhibits
structural effects and agrees very well with the variation of experimental
values. Our evaluated level density parameter 'a' values are compared with
RIPL-2 (Reference Input Parameter Library) data which show good agreement.
|
[{'version': 'v1', 'created': 'Thu, 2 Mar 2023 07:56:44 GMT'}]
|
2023-03-03
|
[array(['Aggarwal', 'Mamta', ''], dtype=object)]
|
1,509 |
2205.13499
|
John Elton
|
John H. Elton
|
Exact Solution to the Chow-Robbins Game for almost all n, using the
Catalan Triangle
| null | null | null | null |
math.PR
|
http://creativecommons.org/licenses/by/4.0/
|
The payoff in the Chow-Robbins coin-tossing game is the proportion of heads
when you stop. Knowing when to stop to maximize expectation was addressed by
Chow and Robbins(1965), who proved there exist integers ${k_n}$ such that it is
optimal to stop when heads minus tails reaches this. Finding ${k_n}$ exactly
was unsolved except for finitely many cases by computer. We show ${k_n} =
\left\lceil {\alpha \sqrt n \,\, - 1/2\,\, + \,\,\frac{{\left( { - 2\zeta ( -
1/2)} \right)\sqrt \alpha }}{{\sqrt \pi }}{n^{ - 1/4}}} \right\rceil$ for
almost all n, where $\alpha $ is the Shepp-Walker constant.This comes from our
estimate ${\beta_n} = \alpha \sqrt n \,\, - 1/2\,\, + \,\,\frac{{\left( { -
2\zeta ( - 1/2)} \right)\sqrt \alpha }}{{\sqrt \pi }}{n^{ - 1/4}} + O\left(
{{n^{ - 7/24}}} \right)$ of real numbers defined by Dvoretzky(1967) for a more
general Value function which is continuous in its first argument and easier to
analyze. An $O({n^{ - 1/4}})$ dependence was conjectured by Christensen and
Fischer(2022) from numerical evidence. Our proof uses moments involving Catalan
and Catalan triangle numbers which appear in a tree resulting from backward
induction, and a generalized backward induction principle. It was motivated by
an idea of H\"aggstr\"om and W\"astlund(2013) to use backward induction of
upper and lower Value bounds from a horizon, which they used numerically to
settle a few cases. Christensen and Fischer, with much better bounds, settled
many more cases. We use Skorohod's embedding to get simple upper and lower
bounds from the Brownian analog; our upper bound is the one found by
Christensen and Fischer in a different way. We use them first for many more
examples, but the new idea is to use them algebraically in the tree, with
feedback to get a sharper Value estimate near the border, to settle almost all
n.
|
[{'version': 'v1', 'created': 'Thu, 26 May 2022 17:14:45 GMT'}
{'version': 'v2', 'created': 'Fri, 10 Jun 2022 17:31:23 GMT'}
{'version': 'v3', 'created': 'Wed, 24 Aug 2022 20:44:56 GMT'}
{'version': 'v4', 'created': 'Wed, 8 Mar 2023 05:52:36 GMT'}
{'version': 'v5', 'created': 'Tue, 6 Jun 2023 02:05:36 GMT'}]
|
2023-06-07
|
[array(['Elton', 'John H.', ''], dtype=object)]
|
1,510 |
math/9210214
| null |
P. D. T. A. Elliott
|
Additive functions on shifted primes
|
6 pages
|
Bull. Amer. Math. Soc. (N.S.) 27 (1992) 273-278
| null |
Bulletin migration 11/99
|
math.NT
| null |
Best possible bounds are obtained for the concentration function of an
additive arithmetic function on sequences of shifted primes.
|
[{'version': 'v1', 'created': 'Thu, 1 Oct 1992 00:00:00 GMT'}]
|
2008-02-03
|
[array(['Elliott', 'P. D. T. A.', ''], dtype=object)]
|
1,511 |
1212.2581
|
Jhon W. Gonz\'alez
|
J. W. Gonz\'alez, F. Delgado, J. Fern\'andez-Rossier
|
Graphene single electron transistor as a spin sensor for magnetic
adsorbates
|
7 pages, 5 Figures, PRB accepted
|
Phys. Rev. B 87, 085433 (2013)
|
10.1103/PhysRevB.87.085433
| null |
cond-mat.mes-hall
|
http://creativecommons.org/licenses/by/3.0/
|
We study single electron transport through a graphene quantum dot with
magnetic adsorbates. We focus on the relation between the spin order of the
adsorbates and the linear conductance of the device. The electronic structure
of the graphene dot with magnetic adsorbates is modeled through numerical
diagonalization of a tight-binding model with an exchange potential. We
consider several mechanisms by which the adsorbate magnetic state can influence
transport in a single electron transistor: by tuning the addition energy, by
changing the tunneling rate and, in the case of spin polarized electrodes,
through magnetoresistive effects. Whereas the first mechanism is always
present, the others require that the electrode has either an energy or spin
dependent density of states. We find that graphene dots are optimal systems to
detect the spin state of a few magnetic centers.
|
[{'version': 'v1', 'created': 'Tue, 11 Dec 2012 18:40:52 GMT'}
{'version': 'v2', 'created': 'Wed, 6 Feb 2013 10:45:54 GMT'}]
|
2013-02-22
|
[array(['González', 'J. W.', ''], dtype=object)
array(['Delgado', 'F.', ''], dtype=object)
array(['Fernández-Rossier', 'J.', ''], dtype=object)]
|
1,512 |
2012.13458
|
Jessica Shang
|
Jessica K Shang, J Brennen Carr, Caroline D Cardinale, Delin Zeng
|
Peristaltic pumping in sub-wavelength channels
| null | null | null | null |
physics.flu-dyn physics.bio-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We apply the lubrication approximation to solve for the flow generated by a
peristaltic traveling wave in a finite, planar channel, and examine the effect
of channel length. Cerebrospinal fluid (CSF) is hypothesized to be
peristaltically transported by arterial pulsations through the perivascular
spaces in the brain. Previous studies of peristaltic perivascular models have
chosen model lengths ranging from sub-wavelength, which is more physiologically
realistic, to full wavelength. Here, we solve for peristaltic flow rates for
arbitrary lengths, and find that sub-wavelength channels significantly modulate
the mean value, phase, and amplitude of flow rate for sinusoidal and general
peristaltic waveforms. The boundary conditions create an internal pressure
gradient such that the instantaneous flow rate varies along the length of the
channel, and the difference between the ends and the middle of the channel is
more pronounced for very short channels. This longitudinal distribution in flow
rate is not observed \emph{in vivo} in perivascular spaces at the surface of
the brain, and hence sub-wavelength peristaltic models whose boundary
conditions are isolated from the larger perivascular network are limited in
their ability to reproduce perivascular flows.
|
[{'version': 'v1', 'created': 'Thu, 24 Dec 2020 22:52:17 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Jun 2021 19:16:03 GMT'}]
|
2021-06-16
|
[array(['Shang', 'Jessica K', ''], dtype=object)
array(['Carr', 'J Brennen', ''], dtype=object)
array(['Cardinale', 'Caroline D', ''], dtype=object)
array(['Zeng', 'Delin', ''], dtype=object)]
|
1,513 |
1912.04389
|
Aishwarya Iyer
|
Aishwarya R. Iyer and Michael R. Line
|
The Influence of Stellar Contamination on the Interpretation of Near
Infrared Transmission Spectra of Sub-Neptune Worlds around M-Dwarfs
|
Resubmitted after 2nd round of minor revisions, 12/06/2019
| null |
10.3847/1538-4357/ab612e
| null |
astro-ph.EP astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The impact of unocculted stellar surface heterogeneities in the form of cool
spots and hot faculae on the spectrum of a transiting planet has been a
daunting problem for the characterization of exoplanet atmospheres. The
wavelength-dependent nature of stellar surface heterogeneities imprinting their
signatures on planetary transmission spectra are of concern particularly for
systems of sub-Neptunes orbiting M-dwarfs. Here we present a systematic
exploration of the impact of this spot-contamination on simulated near infrared
transmission spectra of sub-Neptune planets. From our analysis, we find that
improper correction of stellar surface heterogeneities on transmission spectra
can lead to significant bias when inferring planetary atmospheric properties.
However, this bias is negligible for lower fractions of heterogeneities (<1%).
Additionally, we find that acquiring a priori knowledge of stellar
heterogeneities does not improve precision in constraining planetary parameters
if the heterogeneities are appropriately marginalized within a
retrieval---however these are conditional on our confidence of stellar
atmospheric models being accurate representations of the true photosphere. In
sum, to acquire unbiased constraints when characterizing planetary atmospheres
with the James Webb Space Telescope, we recommend performing joint retrievals
of both the disk-integrated spectrum of the star and the stellar contamination
corrected transmission spectrum.
|
[{'version': 'v1', 'created': 'Mon, 9 Dec 2019 21:49:30 GMT'}]
|
2020-02-12
|
[array(['Iyer', 'Aishwarya R.', ''], dtype=object)
array(['Line', 'Michael R.', ''], dtype=object)]
|
1,514 |
1401.5188
|
Yong-liang Zhang
|
Yong-Liang Zhang, Huan Wang, Li Jing, Liang-Zhu Mu and Heng Fan
|
Fitting magnetic field gradient with Heisenberg-scaling accuracy
|
7 pages, 2 figures
|
Scientific Reports 4, 7390 (2014)
|
10.1038/srep07390
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a quantum fitting scheme to estimate the magnetic field gradient
with $N$-atom spins preparing in W state, which attains the Heisenberg-scaling
accuracy. Our scheme combines the quantum multi-parameter estimation and the
least square linear fitting method to achieve the quantum Cram\'{e}r-Rao bound
(QCRB). We show that the estimated quantity achieves the Heisenberg-scaling
accuracy. In single parameter estimation with assumption that the magnetic
field is strictly linear, two optimal measurements can achieve the identical
Heisenberg-scaling accuracy. Proper interpretation of the
super-Heisenberg-scaling accuracy is presented. The scheme of quantum metrology
combined with data fitting provides a new method in fast high precision
measurements.
|
[{'version': 'v1', 'created': 'Tue, 21 Jan 2014 06:12:08 GMT'}]
|
2014-12-30
|
[array(['Zhang', 'Yong-Liang', ''], dtype=object)
array(['Wang', 'Huan', ''], dtype=object)
array(['Jing', 'Li', ''], dtype=object)
array(['Mu', 'Liang-Zhu', ''], dtype=object)
array(['Fan', 'Heng', ''], dtype=object)]
|
1,515 |
1907.00653
|
Lewis Mead
|
Michael Farber and Lewis Mead
|
Random Simplicial Complexes in the Medial Regime
|
23 pages. v2 contains an updated abstract
| null | null | null |
math.AT math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe topology of random simplicial complexes in the lower and upper
models in the medial regime, i.e. under the assumption that the probability
parameters $p_\sigma$ approach neither $0$ nor $1$. We show that nontrivial
Betti numbers of typical lower and upper random simplicial complexes in the
medial regime lie in a narrow range of dimensions. For instance, an upper
random simplicial complex $Y$ on $n$ vertices in the medial regime with high
probability has non-vanishing Betti numbers $b_{j}(Y)$ only for $k+c
<n-j<k+\log_2 k +c'$ where $k=\log_2 \ln n$ and $c, c' $ are constants. A lower
random simplicial complex on $n$ vertices in the medial regime is with high
probability $(k+a)$-connected and its dimension $d$ satisfies $d\sim k+\log_2
k+ a'$ where $a, \, a'$ are constants. The paper develops a new technique,
based on Alexander duality, which relates the lower and upper models.
|
[{'version': 'v1', 'created': 'Mon, 1 Jul 2019 10:53:32 GMT'}
{'version': 'v2', 'created': 'Tue, 2 Jul 2019 09:26:57 GMT'}
{'version': 'v3', 'created': 'Sun, 21 Jul 2019 16:54:59 GMT'}]
|
2019-07-23
|
[array(['Farber', 'Michael', ''], dtype=object)
array(['Mead', 'Lewis', ''], dtype=object)]
|
1,516 |
0912.5045
|
Desheng Kong
|
Desheng Kong, Jason C. Randel, Hailin Peng, Judy J. Cha, Stefan
Meister, Keji Lai, Yulin Chen, Zhi-Xun Shen, Hari C. Manoharan, and Yi Cui
|
Topological Insulator Nanowires and Nanoribbons
|
Nano Letters, Article ASAP
|
Nano Lett., 2010, 10 (1), pp 329-333
|
10.1021/nl903663a
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent theoretical calculations and photoemission spectroscopy measurements
on the bulk Bi2Se3 material show that it is a three-dimensional topological
insulator possessing conductive surface states with nondegenerate spins,
attractive for dissipationless electronics and spintronics applications.
Nanoscale topological insulator materials have a large surface-to-volume ratio
that can manifest the conductive surface states and are promising candidates
for devices. Here we report the synthesis and characterization of high quality
single crystalline Bi2Se3 nanomaterials with a variety of morphologies. The
synthesis of Bi2Se3 nanowires and nanoribbons employs Au-catalyzed
vapor-liquid-solid (VLS) mechanism. Nanowires, which exhibit rough surfaces,
are formed by stacking nanoplatelets along the axial direction of the wires.
Nanoribbons are grown along [11-20] direction with a rectangular cross-section
and have diverse morphologies, including quasi-one-dimensional, sheetlike,
zigzag and sawtooth shapes. Scanning tunneling microscopy (STM) studies on
nanoribbons show atomically smooth surfaces with ~ 1 nm step edges, indicating
single Se-Bi-Se-Bi-Se quintuple layers. STM measurements reveal a honeycomb
atomic lattice, suggesting that the STM tip couples not only to the top Se
atomic layer, but also to the Bi atomic layer underneath, which opens up the
possibility to investigate the contribution of different atomic orbitals to the
topological surface states. Transport measurements of a single nanoribbon
device (four terminal resistance and Hall resistance) show great promise for
nanoribbons as candidates to study topological surface states.
|
[{'version': 'v1', 'created': 'Sun, 27 Dec 2009 00:28:41 GMT'}]
|
2010-05-02
|
[array(['Kong', 'Desheng', ''], dtype=object)
array(['Randel', 'Jason C.', ''], dtype=object)
array(['Peng', 'Hailin', ''], dtype=object)
array(['Cha', 'Judy J.', ''], dtype=object)
array(['Meister', 'Stefan', ''], dtype=object)
array(['Lai', 'Keji', ''], dtype=object)
array(['Chen', 'Yulin', ''], dtype=object)
array(['Shen', 'Zhi-Xun', ''], dtype=object)
array(['Manoharan', 'Hari C.', ''], dtype=object)
array(['Cui', 'Yi', ''], dtype=object)]
|
1,517 |
1902.02054
|
Alexandre Martin
|
Alexandre Martin (AGM)
|
On the Limiting Absorption Principle for Schr{\"o}dinger operators on
waveguides
|
This article is a translation of a chapter of my PhD thesis
| null | null | null |
math.SP math-ph math.AP math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove a Limiting Absorption Principle for Schr{\"o}dinger operators in
tubes about infinite curves embedded in the Euclidian space with different
types of boundary conditions. The argument is based on the Mourre theory with
conjugate operators different from the generator of dilations which is usually
used in this case, and permits to prove a Limiting Absorption Principle for
Schr{\"o}dinger operators in singular waveguides.
|
[{'version': 'v1', 'created': 'Wed, 6 Feb 2019 07:43:34 GMT'}]
|
2019-02-07
|
[array(['Martin', 'Alexandre', '', 'AGM'], dtype=object)]
|
1,518 |
1509.08325
|
Chih-Hung Chang Lucius
|
Jung-Chao Ban and Chih-Hung Chang
|
Tree-Shifts: The entropy of tree-shifts of finite type
| null | null | null | null |
math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper studies the entropy of tree-shifts of finite type with and without
boundary conditions. We demonstrate that computing the entropy of a tree-shift
of finite type is equivalent to solving a system of nonlinear recurrence
equations. Furthermore, the entropy of the binary Markov tree-shifts over two
symbols is either $0$ or $\ln 2$. Meanwhile, the realization of a class of
reals including multinacci numbers is elaborated, which indicates that
tree-shifts are capable of rich phenomena. By considering the influence of
three different types of boundary conditions, say, the periodic, Dirichlet, and
Neumann boundary conditions, the necessary and sufficient conditions for the
coincidence of entropy with and without boundary conditions are addressed.
|
[{'version': 'v1', 'created': 'Mon, 28 Sep 2015 14:11:18 GMT'}
{'version': 'v2', 'created': 'Mon, 5 Oct 2015 12:14:59 GMT'}
{'version': 'v3', 'created': 'Mon, 6 Mar 2017 08:34:55 GMT'}]
|
2017-03-07
|
[array(['Ban', 'Jung-Chao', ''], dtype=object)
array(['Chang', 'Chih-Hung', ''], dtype=object)]
|
1,519 |
1709.02316
|
Nikhil Das
|
Nikhil Das, Naman Gupta, Michael Yip
|
Fastron: An Online Learning-Based Model and Active Learning Strategy for
Proxy Collision Detection
| null | null | null | null |
cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce the Fastron, a configuration space (C-space) model to be used as
a proxy to kinematic-based collision detection. The Fastron allows iterative
updates to account for a changing environment through a combination of a novel
formulation of the kernel perceptron learning algorithm and an active learning
strategy. Our simulations on a 7 degree-of-freedom arm indicate that proxy
collision checks may be performed at least 2 times faster than an efficient
polyhedral collision checker and at least 8 times faster than an efficient
high-precision collision checker. The Fastron model provides conservative
collision status predictions by padding C-space obstacles, and proxy collision
checking time does not scale poorly as the number of workspace obstacles
increases. All results were achieved without GPU acceleration or parallel
computing.
|
[{'version': 'v1', 'created': 'Thu, 7 Sep 2017 15:32:46 GMT'}]
|
2017-09-08
|
[array(['Das', 'Nikhil', ''], dtype=object)
array(['Gupta', 'Naman', ''], dtype=object)
array(['Yip', 'Michael', ''], dtype=object)]
|
1,520 |
1504.05343
|
Ryota Nakai
|
Ryota Nakai, Shinsei Ryu, Kentaro Nomura
|
Finite-temperature effective boundary theory of the quantized thermal
Hall effect
|
18 pages
|
New J. Phys. 18, 023038 (2016)
|
10.1088/1367-2630/18/2/023038
| null |
cond-mat.mes-hall cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A finite-temperature effective free energy of the boundary of a quantized
thermal Hall system is derived microscopically from the bulk two-dimensional
Dirac fermion coupled with a gravitational field. In two spatial dimensions,
the thermal Hall conductivity of fully gapped insulators and superconductors is
quantized and given by the bulk Chern number, in analogy to the quantized
electric Hall conductivity in quantum Hall systems. From the perspective of
effective action functionals, two distinct types of the field theory have been
proposed to describe the quantized thermal Hall effect. One of these, known as
the gravitational Chern-Simons action, is a kind of topological field theory,
and the other is a phenomenological theory relevant to the St\v{r}eda formula.
In order to solve this problem, we derive microscopically an effective theory
that accounts for the quantized thermal Hall effect. In this paper, the
two-dimensional Dirac fermion under a static background gravitational field is
considered in equilibrium at a finite temperature, from which an effective
boundary free energy functional of the gravitational field is derived. This
boundary theory is shown to explain the quantized thermal Hall conductivity and
thermal Hall current in the bulk by assuming the Lorentz symmetry. The bulk
effective theory is consistently determined via the boundary effective theory
|
[{'version': 'v1', 'created': 'Tue, 21 Apr 2015 09:00:27 GMT'}
{'version': 'v2', 'created': 'Tue, 16 Feb 2016 19:47:18 GMT'}]
|
2016-02-17
|
[array(['Nakai', 'Ryota', ''], dtype=object)
array(['Ryu', 'Shinsei', ''], dtype=object)
array(['Nomura', 'Kentaro', ''], dtype=object)]
|
1,521 |
2210.08513
|
Lidan Wang
|
Lidan Wang
|
The ground state solutions of nonlinear Schr\"{o}dinger equations with
Hardy weights on lattice graphs
|
22 pages
| null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we study the nonlinear Schr\"{o}dinger equation $$ -\Delta
u+(V(x)- \frac{\rho}{(|x|^2+1)})u=f(x,u) $$ on the lattice graph $\mathbb{Z}^N$
with $N\geq 3$, where $V$ is a bounded periodic potential and $0$ lies in a
spectral gap of the Schr\"{o}dinger operator $-\Delta+V$. Under some
assumptions on the nonlinearity $f$, we prove the existence and asymptotic
behavior of ground state solutions with small $\rho\geq 0$ by the generalized
linking theorem.
|
[{'version': 'v1', 'created': 'Sun, 16 Oct 2022 11:49:23 GMT'}]
|
2022-10-18
|
[array(['Wang', 'Lidan', ''], dtype=object)]
|
1,522 |
2004.10242
|
Anton Ryabtsev
|
Anton Ryabtsev
|
The error accumulation in the conjugate gradient method for degenerate
problem
|
14 pages, in Russian, 10 figures
| null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider the conjugate gradient method for solving the
problem of minimizing a quadratic function with additive noise in the gradient.
Three concepts of noise were considered: antagonistic noise in the linear term,
stochastic noise in the linear term, and noise in the quadratic term, as well
as combinations of the first and second with the last. It was experimentally
obtained that error accumulation is absent for any of the considered concepts,
which differs from the folklore opinion that, as in accelerated methods, error
accumulation must take place. The paper gives motivation for why the error may
not accumulate. The dependence of the solution error both on the magnitude
(scale) of the noise and on the size of the solution using the conjugate
gradient method was also experimentally investigated. Hypotheses about the
dependence of the error in the solution on the noise scale and the size
(2-norm) of the solution are proposed and tested for all the concepts
considered. It turned out that the error in the solution (by function) linearly
depends on the noise scale. The work contains graphs illustrating each
individual study, as well as a detailed description of numerical experiments,
which includes an account of the methods of the noise of both the vector and
the matrix.
|
[{'version': 'v1', 'created': 'Tue, 21 Apr 2020 19:10:54 GMT'}
{'version': 'v2', 'created': 'Wed, 13 May 2020 07:25:41 GMT'}]
|
2020-05-14
|
[array(['Ryabtsev', 'Anton', ''], dtype=object)]
|
1,523 |
astro-ph/0610955
|
Andreas Reisenegger
|
Andreas Reisenegger, Rodrigo Fernandez, Paula Jofre
|
Internal heating and thermal emission from old neutron stars:
Constraints on dense-matter and gravitational physics
|
6 pages, 7 figures. To appear in the proceedings of "Isolated Neutron
Stars: from the Interior to the Surface", a conference held in London in
April 2006 (special issue of Astrophysics and Space Science, edited by Dany
Page, Roberto Turolla, & Silvia Zane)
|
Astrophys.SpaceSci.308:413-418,2007
|
10.1007/s10509-007-9331-0
| null |
astro-ph gr-qc nucl-th
| null |
The equilibrium composition of neutron star matter is achieved through weak
interactions (direct and inverse beta decays), which proceed on relatively long
time scales. If the density of a matter element is perturbed, it will relax to
the new chemical equilibrium through non-equilibrium reactions, which produce
entropy that is partly released through neutrino emission, while a similar
fraction heats the matter and is eventually radiated as thermal photons. We
examined two possible mechanisms causing such density perturbations: 1) the
reduction in centrifugal force caused by spin-down (particularly in millisecond
pulsars), leading to "rotochemical heating", and 2) a hypothetical
time-variation of the gravitational constant, as predicted by some theories of
gravity and current cosmological models, leading to "gravitochemical heating".
If only slow weak interactions are allowed in the neutron star (modified Urca
reactions, with or without Cooper pairing), rotochemical heating can account
for the observed ultraviolet emission from the closest millisecond pulsar, PSR
J0437-4715, which also provides a constraint on |dG/dt| of the same order as
the best available in the literature.
|
[{'version': 'v1', 'created': 'Tue, 31 Oct 2006 19:14:57 GMT'}]
|
2008-11-26
|
[array(['Reisenegger', 'Andreas', ''], dtype=object)
array(['Fernandez', 'Rodrigo', ''], dtype=object)
array(['Jofre', 'Paula', ''], dtype=object)]
|
1,524 |
1608.01162
|
A. D. Alhaidari
|
A. D. Alhaidari, T. J. Taiwo
|
The Wilson-Racah Quantum System
|
9 pages, three colored figures
|
J. Math. Phys. 58, 022101 (2017)
|
10.1063/1.4975138
| null |
quant-ph math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using a recent formulation of quantum mechanics without potential function,
we present a four-parameter system associated with the Wilson and Racah
polynomials. The continuum scattering states are written in terms of the Wilson
polynomials whose asymptotics gives the scattering amplitude and phase shift.
On the other hand, the finite number of discrete bound states are associated
with the Racah polynomials.
We are honored to dedicate this work to Prof. Hashim A. Yamani on the
occasion of his 70th birthday.
|
[{'version': 'v1', 'created': 'Wed, 3 Aug 2016 12:18:33 GMT'}]
|
2017-02-06
|
[array(['Alhaidari', 'A. D.', ''], dtype=object)
array(['Taiwo', 'T. J.', ''], dtype=object)]
|
1,525 |
1909.12136
|
Thomas Haider
|
Thomas Haider, Steffen Eger
|
Semantic Change and Emerging Tropes In a Large Corpus of New High German
Poetry
|
Historical Language Change Workshop at ACL 2019, Florence
|
Proceedings of the 1st International Workshop on Computational
Approaches to Historical Language Change (pp. 216-222). At ACL 2019,
Florence. https://www.aclweb.org/anthology/W19-4727
| null | null |
cs.CL
|
http://creativecommons.org/licenses/by/4.0/
|
Due to its semantic succinctness and novelty of expression, poetry is a great
test bed for semantic change analysis. However, so far there is a scarcity of
large diachronic corpora. Here, we provide a large corpus of German poetry
which consists of about 75k poems with more than 11 million tokens, with poems
ranging from the 16th to early 20th century. We then track semantic change in
this corpus by investigating the rise of tropes (`love is magic') over time and
detecting change points of meaning, which we find to occur particularly within
the German Romantic period. Additionally, through self-similarity, we
reconstruct literary periods and find evidence that the law of linear semantic
change also applies to poetry.
|
[{'version': 'v1', 'created': 'Thu, 26 Sep 2019 14:18:09 GMT'}]
|
2019-09-27
|
[array(['Haider', 'Thomas', ''], dtype=object)
array(['Eger', 'Steffen', ''], dtype=object)]
|
1,526 |
astro-ph/0611523
|
J. Sanchez Almeida
|
J. Sanchez Almeida (1), I. Marquez (1 and 2), J. A. Bonet (1), I.
Dominguez Cerdena (1) ((1) Instituto de Astrofisica de Canarias, La Laguna,
Tenerife, Spain, (2) Departamento de Analisis Matematico, Universidad de La
Laguna, Tenerife, Spain)
|
The Evershed effect observed with 0.2 arsec angular resolution
|
To appear in ApJ. 14 pages and 17 figures
| null |
10.1086/511254
| null |
astro-ph
| null |
We present an analysis of the Evershed effect observed with a resolution of
0.2 arcsec. Using the new Swedish 1-m Solar Telescope and its Littrow
spectrograph, we scan a significant part of a sunspot penumbra. Spectra of the
non-magnetic line Fe I 7090.4 A allows us to measure Doppler shifts without
magnetic contamination. The observed line profiles are asymmetric. The Doppler
shift depends on the part of the line used for measuring, indicating that the
velocity structure of penumbrae remains unresolved even with our angular
resolution. The observed line profiles are properly reproduced if two
components with velocities between zero and several km/s co-exist in the
resolution elements. Using Doppler shifts at fixed line depths, we find a local
correlation between upflows and bright structures, and downflows and dark
structures. This association is not specific of the outer penumbra but it also
occurs in the inner penumbra. The existence of such correlation was originally
reported by Beckers & Schroter (1969), and it is suggestive of energy transport
by convection in penumbrae.
|
[{'version': 'v1', 'created': 'Thu, 16 Nov 2006 15:42:26 GMT'}]
|
2015-06-24
|
[array(['Almeida', 'J. Sanchez', '', '1 and 2'], dtype=object)
array(['Marquez', 'I.', '', '1 and 2'], dtype=object)
array(['Bonet', 'J. A.', ''], dtype=object)
array(['Cerdena', 'I. Dominguez', ''], dtype=object)]
|
1,527 |
astro-ph/0103113
|
Emanuele Giallongo
|
F. Poli, N. Menci, E. Giallongo, A. Fontana, S. Cristiani, S. D'
Odorico
|
The Evolution of the Luminosity Function in Deep Fields: A Comparison
with CDM Models
|
Revised version; corrected magnitudes at 1700 Angstrom in figure 2;
ApJL
| null |
10.1086/319840
| null |
astro-ph
| null |
The galaxy Luminosity Function (LF) has been estimated in the rest frame B
luminosity at 0<z<1.25 and at 1700 {\AA} for 2.5<z<4.5 from deep multicolor
surveys in the HDF-N, HDF-S, NTT-DF. The results have been compared with a
recent version of galaxy formation models in the framework of hierarchical
clustering in a flat Cold Dark Matter Universe with cosmological constant. The
results show a general agreement for z<= 1, although the model LF has a steeper
average slope at the faint end; at z~3 such feature results in an
overprediction of the number of faint (I_{AB}~ 27) galaxies, while the
agreement at the bright end becomes critically sensitive to the details of dust
absorption at such redshifts. The discrepancies at the faint end show that a
refined treatement of the physical processes involving smaller galaxies is to
be pursued in the models, in terms of aggregation processes and/or stellar
feedback heavily affecting the luminosity of the low luminosity objects. The
implications of our results on the evolution of the cosmological star formation
rate are discussed.
|
[{'version': 'v1', 'created': 'Wed, 7 Mar 2001 15:22:48 GMT'}
{'version': 'v2', 'created': 'Tue, 27 Mar 2001 13:45:15 GMT'}
{'version': 'v3', 'created': 'Thu, 12 Apr 2001 16:59:34 GMT'}]
|
2009-11-06
|
[array(['Poli', 'F.', ''], dtype=object)
array(['Menci', 'N.', ''], dtype=object)
array(['Giallongo', 'E.', ''], dtype=object)
array(['Fontana', 'A.', ''], dtype=object)
array(['Cristiani', 'S.', ''], dtype=object)
array(['Odorico', "S. D'", ''], dtype=object)]
|
1,528 |
1807.00211
|
Evgeny Lavrik
|
E. Lavrik and I. Panasenko and H.R. Schmidt
|
Advanced Methods for the Optical Quality Assurance of Silicon Sensors
| null | null |
10.1016/j.nima.2018.10.210
| null |
physics.ins-det cs.LG hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe a setup for optical quality assurance of silicon microstrip
sensors. Pattern recognition algorithms were developed to analyze microscopic
scans of the sensors for defects. It is shown that the software has a
recognition and classification rate of $>$~90\% for defects like scratches,
shorts, broken metal lines etc. We have demonstrated that advanced image
processing based on neural network techniques is able to further improve the
recognition and defect classification rate.
|
[{'version': 'v1', 'created': 'Sat, 30 Jun 2018 17:56:51 GMT'}
{'version': 'v2', 'created': 'Tue, 30 Oct 2018 20:16:47 GMT'}]
|
2019-02-20
|
[array(['Lavrik', 'E.', ''], dtype=object)
array(['Panasenko', 'I.', ''], dtype=object)
array(['Schmidt', 'H. R.', ''], dtype=object)]
|
1,529 |
cond-mat/0506542
|
Nicolas Dupuis
|
N. Dupuis
|
Renormalization group approach to interacting fermion systems in the
two-particle-irreducible formalism
|
(v2) 21 pages, 10 figures
|
Eur.Phys.J. B48 (2005) 319
|
10.1140/epjb/e2005-00409-7
| null |
cond-mat.str-el hep-th
| null |
We describe a new formulation of the functional renormalization group (RG)
for interacting fermions within a Wilsonian momentum-shell approach. We show
that the Luttinger-Ward functional is a fixed point of the RG, and derive the
infinite hierarchy of flow equations satisfied by the two-particle-irreducible
(2PI) vertices. In the one-loop approximation, this hierarchy reduces to two
equations that determine the self-energy and the 2PI two-particle vertex
$\Phi^{(2)}$. Susceptibilities are calculated from the Bethe-Salpeter equation
that relates them to $\Phi^{(2)}$. While the one-loop approximation breaks down
at low energy in one-dimensional systems (for reasons that we discuss), it
reproduces the exact results both in the normal and ordered phases in
single-channel (i.e. mean-field) theories, as shown on the example of BCS
theory. The possibility to continue the RG flow into broken-symmetry phases is
an essential feature of the 2PI RG scheme and is due to the fact that the 2PI
two-particle vertex, contrary to its 1PI counterpart, is not singular at a
phase transition. Moreover, the normal phase RG equations can be directly used
to derive the Ginzburg-Landau expansion of the thermodynamic potential near a
phase transition. We discuss the implementation of the 2PI RG scheme to
interacting fermion systems beyond the examples (one-dimensional systems and
BCS superconductors) considered in this paper.
|
[{'version': 'v1', 'created': 'Tue, 21 Jun 2005 14:51:45 GMT'}
{'version': 'v2', 'created': 'Fri, 11 Nov 2005 16:51:54 GMT'}]
|
2007-05-23
|
[array(['Dupuis', 'N.', ''], dtype=object)]
|
1,530 |
2112.02149
|
Chandralekha Singh
|
Chandralekha Singh
|
Strategies and Resources for teaching your physics course online on
short notice
| null |
American Physical Society Forum on Education Newsletter, pp. 6-8,
Summer 2020
| null | null |
physics.ed-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article summarizes strategies and resources for teaching physics courses
online on short notice.
|
[{'version': 'v1', 'created': 'Fri, 3 Dec 2021 20:16:15 GMT'}]
|
2021-12-07
|
[array(['Singh', 'Chandralekha', ''], dtype=object)]
|
1,531 |
2304.04130
|
David Moss
|
David J. Moss
|
Theory for the Accuracy of Microcomb Photonic Microwave Transversal
Signal Processors
|
17 pages, 12 figures, 103 references
|
IEEE Journal of Selected Topics in Quantum Electronics (JSTQE)
Volume 29 (2023)
|
10.1109/JSTQE.2023.3266276
| null |
physics.optics eess.SP
|
http://creativecommons.org/licenses/by/4.0/
|
Photonic RF transversal signal processors, which are equivalent to
reconfigurable electrical digital signal processors but implemented with
photonic technologies, have been widely used for modern high-speed information
processing. With the capability of generating large numbers of wavelength
channels with compact micro-resonators, optical microcombs bring new
opportunities for realizing photonic RF transversal signal processors that have
greatly reduced size, power consumption, and complexity. Recently, a variety of
signal processing functions have been demonstrated using microcomb-based
photonic RF transversal signal processors. Here, we provide detailed analysis
for quantifying the processing accuracy of microcomb-based photonic RF
transversal signal processors. First, we investigate the theoretical
limitations of the processing accuracy determined by tap number, signal
bandwidth, and pulse waveform. Next, we discuss the practical error sources
from different components of the signal processors. Finally, we analyze the
contributions of the theoretical limitations and the experimental factors to
the overall processing inaccuracy both theoretically and experimentally. These
results provide a useful guide for designing microcomb-based photonic RF
transversal signal processors to optimize their accuracy.
|
[{'version': 'v1', 'created': 'Sun, 9 Apr 2023 01:04:40 GMT'}]
|
2023-04-11
|
[array(['Moss', 'David J.', ''], dtype=object)]
|
1,532 |
2012.15632
|
Jerzy Krzempek
|
Jerzy Krzempek
|
Feeding and killing end points in chainable continua
|
10 pp. Submitted to Topology and Its Applications
| null | null | null |
math.GN
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Using the classical technique of condensation of singularities, we prove
that, for every zero-dimensional, complete separable metric space $G$, there
exists a Suslinian, chainable metric continuum whose set of end points is
homeomorphic to $G$. This answers a question posed by R. Adikari and W. Lewis
in [Houston J. Math. 45 (2019), no. 2, pp. 609--624].
|
[{'version': 'v1', 'created': 'Thu, 31 Dec 2020 14:45:32 GMT'}]
|
2021-01-01
|
[array(['Krzempek', 'Jerzy', ''], dtype=object)]
|
1,533 |
2203.16657
|
Tobias B\"ohle
|
Tobias B\"ohle, Mechthild Thalhammer and Christian Kuehn
|
Community Integration Algorithms (CIAs) for Dynamical Systems on
Networks
|
12 pages, 6 figures
| null |
10.1016/j.jcp.2022.111524
| null |
math.NA cs.NA math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dynamics of large-scale network processes underlies crucial phenomena ranging
across all sciences. Forward simulation of large network models is often
computationally prohibitive. Yet, most networks have intrinsic community
structure. We exploit these communities and propose a fast simulation algorithm
for network dynamics. In particular, aggregating the inputs a node receives
constitutes the limiting factor in numerically simulating large-scale network
dynamics. We develop community integration algorithms (CIAs) significantly
reducing function-evaluations. We obtain a substantial reduction from
polynomial to linear computational complexity. We illustrate our results in
multiple applications including classical and higher-order Kuramoto-type
systems for synchronisation and Cucker--Smale systems exhibiting flocking
behaviour on synthetic as well as real-world networks. Numerical comparison and
theoretical analysis confirm the robustness and efficiency of CIAs.
|
[{'version': 'v1', 'created': 'Wed, 30 Mar 2022 20:19:41 GMT'}]
|
2022-08-31
|
[array(['Böhle', 'Tobias', ''], dtype=object)
array(['Thalhammer', 'Mechthild', ''], dtype=object)
array(['Kuehn', 'Christian', ''], dtype=object)]
|
1,534 |
2007.01626
|
Charles Cox
|
Charles Garnet Cox
|
Invariable generation and the Houghton groups
|
11 pages, 1 figure
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Houghton groups $H_1, H_2, \ldots$ are a family of infinite groups. In
1975 Wiegold showed that $H_3$ was invariably generated (IG) but $H_1\le H_3$
was not. A natural question is then whether the groups $H_2, H_3, \ldots$ are
all IG. Wiegold also ends by saying that, in the examples he had found of an IG
group with a subgroup that is not IG, the subgroup was never of finite index.
Another natural question is then whether there is a subgroup of finite index in
$H_3$ that is not IG. In this note we prove, for each $n\in \{2, 3, \ldots\}$,
that $H_n$ and all of its finite index subgroups are IG.
The independent work of Minasyan and Goffer-Lazarovich in June 2020 frames
this note quite nicely: they showed that an IG group can have a finite index
subgroup that is not IG.
|
[{'version': 'v1', 'created': 'Fri, 3 Jul 2020 11:42:18 GMT'}]
|
2020-07-06
|
[array(['Cox', 'Charles Garnet', ''], dtype=object)]
|
1,535 |
2205.03102
|
Mathieu Bajodek
|
Mathieu Bajodek (LAAS-MAC), Fr\'ed\'eric Gouaisbaut (LAAS-MAC),
Alexandre Seuret (LAAS-MAC)
|
Necessary and sufficient stability condition for time-delay systems
arising from Legendre approximation
| null | null | null |
Rapport LAAS no. 21403
|
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, sufficient conditions of stability or instability for time-delay
systems have been proven to be necessary. In this way, a remarkable necessary
and sufficient condition has then been developed by Gomez et al. It is
presented as a simple test of positive definiteness of a matrix issued from the
Lyapunov matrix. In this paper, an extension of this result is presented.
Without going into details, the uniform discretization of the state has been
replaced by projections on the first Legendre polynomials. Like Gomez et al.,
based on convergence arguments, the necessity is obtained in finite order,
which can be calculated analytically. Compared to them, by relying on the fast
convergence rate of Legendre approximation, the required order to ensure
stability has been reduced. Thanks to this major modification, as shown in the
example section, it is possible the find stable regions for low orders and
unstable ones for even smaller orders.
|
[{'version': 'v1', 'created': 'Fri, 6 May 2022 09:32:56 GMT'}]
|
2022-05-09
|
[array(['Bajodek', 'Mathieu', '', 'LAAS-MAC'], dtype=object)
array(['Gouaisbaut', 'Frédéric', '', 'LAAS-MAC'], dtype=object)
array(['Seuret', 'Alexandre', '', 'LAAS-MAC'], dtype=object)]
|
1,536 |
1911.06640
|
Raffael Stenzel
|
Raffael Stenzel
|
Univalence and completeness of Segal objects
|
Final journal version for JPAA. Improved exposition (particularly
Sections 2 and 5) and corrected minor mistakes in virtue of the comments of
an anonymous referee
| null |
10.1016/j.jpaa.2022.107254
| null |
math.CT math.AT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Univalence, originally a type theoretical notion at the heart of Voevodsky's
Univalent Foundations Program, has found general importance as a higher
categorical property that characterizes descent and hence classifying maps in
$(\infty,1)$-categories. Completeness is a property of Segal spaces introduced
by Rezk that characterizes those Segal spaces which are
$(\infty,1)$-categories. In this paper, first, we make rigorous an analogy
between univalence and completeness that has found various informal expressions
in the higher categorical research community to date, and second, study its
ramifications.
The core aspect of this analogy can be understood as a translation between
internal and external notions, motivated by model categorical considerations of
Joyal and Tierney. As a result, we characterize the internal notion of
univalence in logical model categories by the external notion of completeness
defined as the right Quillen condition of suitably indexed Set-weighted limit
functors.
Furthermore, we extend the analogy and show that univalent completion in the
sense of van den Berg and Moerdijk translates to Rezk-completion of associated
Segal objects as well. Motivated by these correspondences, we exhibit
univalence as a homotopical locality condition whenever univalent completion
exists.
|
[{'version': 'v1', 'created': 'Fri, 15 Nov 2019 13:59:32 GMT'}
{'version': 'v2', 'created': 'Sun, 29 Nov 2020 16:44:38 GMT'}
{'version': 'v3', 'created': 'Sat, 12 Nov 2022 12:01:47 GMT'}]
|
2022-11-15
|
[array(['Stenzel', 'Raffael', ''], dtype=object)]
|
1,537 |
2103.00255
|
Armin Goudarzi
|
Armin Goudarzi, Carsten Spehr, Steffen Herbold
|
Expert Decision Support System for aeroacoustic source type
identification using clustering
|
Preprint for JASA Journal
| null |
10.1121/10.0009322
| null |
cs.SD cs.AI cs.LG eess.AS
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
This paper presents an Expert Decision Support System for the identification
of time-invariant, aeroacoustic source types. The system comprises two steps:
first, acoustic properties are calculated based on spectral and spatial
information. Second, clustering is performed based on these properties. The
clustering aims at helping and guiding an expert for quick identification of
different source types, providing an understanding of how sources differ. This
supports the expert in determining similar or atypical behavior. A variety of
features are proposed for capturing the characteristics of the sources. These
features represent aeroacoustic properties that can be interpreted by both the
machine and by experts. The features are independent of the absolute Mach
number which enables the proposed method to cluster data measured at different
flow configurations. The method is evaluated on deconvolved beamforming data
from two scaled airframe half-model measurements. For this exemplary data, the
proposed support system method results in clusters that mostly correspond to
the source types identified by the authors. The clustering also provides the
mean feature values and the cluster hierarchy for each cluster and for each
cluster member a clustering confidence. This additional information makes the
results transparent and allows the expert to understand the clustering choices.
|
[{'version': 'v1', 'created': 'Sat, 27 Feb 2021 15:47:59 GMT'}
{'version': 'v2', 'created': 'Thu, 18 Nov 2021 17:55:22 GMT'}]
|
2022-03-09
|
[array(['Goudarzi', 'Armin', ''], dtype=object)
array(['Spehr', 'Carsten', ''], dtype=object)
array(['Herbold', 'Steffen', ''], dtype=object)]
|
1,538 |
2008.09797
|
Subhasis Ghora
|
Subhasis Ghora, Tarakanta Nayak, Satyajit Sahoo
|
On Fatou sets containing Baker omitted value
|
21 pages, 7 figures
| null | null | null |
math.DS
|
http://creativecommons.org/licenses/by-sa/4.0/
|
An omitted value of a transcendental meromorphic function $f$ is called a
Baker omitted value, in short \textit{bov} if there is a disk $D$ centered at
the bov such that each component of the boundary of $f^{-1}(D)$ is bounded.
Assuming that the bov is in the Fatou set of $f$, this article investigates the
dynamics of the function. Firstly, the connectivity of all the Fatou components
are determined. If $U$ is the Fatou component containing the bov then it is
proved that a Fatou component $U'$ is infinitely connected if and only if it
lands on $U$, i.e. $f^{k}(U') \subset U$ for some $k \geq 1$. Every other Fatou
component is either simply connected or lands on a Herman ring. Further,
assuming that the number of critical points in the Fatou set whose forward
orbits do not intersect $U$ is finite, we have shown that the connectivity of
each Fatou component belongs to a finite set. This set is independent of the
Fatou components. It is proved that the Fatou component containing the bov is
completely invariant whenever it is forward invariant. Further, if the
invariant Fatou component is an attracting domain and compactly contains all
the critical values of the function then the Julia set is totally disconnected.
Baker domains are shown to be non-existent whenever the bov is in the Fatou
set. It is also proved that, if there is a $2$-periodic Baker domain (these are
not ruled out when the bov is in the Julia set), or a $2$-periodic attracting
or parabolic domain containing the bov then the function has no Herman ring.
Some examples exhibiting different possibilities for the Fatou set are
discussed. This includes the first example of a meromorphic function with an
omitted value which has two infinitely connected Fatou components.
|
[{'version': 'v1', 'created': 'Sat, 22 Aug 2020 10:19:41 GMT'}
{'version': 'v2', 'created': 'Sat, 3 Jul 2021 11:11:04 GMT'}]
|
2021-07-06
|
[array(['Ghora', 'Subhasis', ''], dtype=object)
array(['Nayak', 'Tarakanta', ''], dtype=object)
array(['Sahoo', 'Satyajit', ''], dtype=object)]
|
1,539 |
1812.05009
|
Esteban Gonz\'alez
|
Norman Cruz, Esteban Gonz\'alez and Guillermo Palma
|
Exact analytical solution for an Israel-Stewart Cosmology
|
12 pages, 3 figures. We have partially rewritten the article
emphasizing the mathematical aspects related to the new analytical solution
found in the frame of a causal Israel-Stewart cosmology. The title as well as
the abstract were slightly modified according to the former resubmission of
the paper
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article we report a novel analytic solution for a cosmological model
with a matter content described by a one component dissipative fluid, in the
framework of the causal Israel-Stewart theory. Some physically well motivated
analytical relations for the bulk viscous coefficient, the relaxation time and
a bariotropic equation of state are postulated. We study within the parameter
space, which label the solution, a suited region compatible with an accelerated
expansion of the universe for late times, as well as stability properties of
the solution at the critical parameter values $ \gamma = 1$ and for $ s = 1/2
$. We study as well the consequences that arise from the positiveness of the
entropy production along the time evolution. In general, the accelerated
expansion at late times is only possible when $\epsilon\geq 1/18$, which
implies a very large non-adiabatic contribution the speed of sound.
|
[{'version': 'v1', 'created': 'Wed, 12 Dec 2018 16:33:33 GMT'}
{'version': 'v2', 'created': 'Fri, 9 Aug 2019 21:10:11 GMT'}
{'version': 'v3', 'created': 'Tue, 13 Aug 2019 21:31:06 GMT'}]
|
2019-08-15
|
[array(['Cruz', 'Norman', ''], dtype=object)
array(['González', 'Esteban', ''], dtype=object)
array(['Palma', 'Guillermo', ''], dtype=object)]
|
1,540 |
2306.13830
|
Zhenyu Gao
|
Zhenyu Gao, Dimitri N. Mavris
|
Aircraft Environmental Impact Segmentation via Metric Learning
|
22 pages, 7 figures
| null | null | null |
cs.LG stat.AP
|
http://creativecommons.org/licenses/by/4.0/
|
Metric learning is the process of learning a tailored distance metric for a
particular task. This advanced subfield of machine learning is useful to any
machine learning or data mining task that relies on the computation of
distances or similarities over objects. In recently years, machine learning
techniques have been extensively used in aviation and aerospace engineering to
make predictions, extract patterns, discover knowledge, etc. Nevertheless,
metric learning, an element that can advance the performance of complex machine
learning tasks, has so far been hardly utilized in relevant literature. In this
study, we apply classic metric learning formulations with novel components on
aviation environmental impact modeling. Through a weakly-supervised metric
learning task, we achieve significant improvement in the newly emerged problem
of aircraft characterization and segmentation for environmental impacts. The
result will enable the more efficient and accurate modeling of aircraft
environmental impacts, a focal topic in sustainable aviation. This work is also
a demonstration that shows the potential and value of metric learning in a wide
variety of similar studies in the transportation domain.
|
[{'version': 'v1', 'created': 'Sat, 24 Jun 2023 01:14:48 GMT'}]
|
2023-06-27
|
[array(['Gao', 'Zhenyu', ''], dtype=object)
array(['Mavris', 'Dimitri N.', ''], dtype=object)]
|
1,541 |
0809.1164
|
Achenef Tesfahun
|
Achenef Tesfahun
|
Global Well-posedness of the 1D Dirac-Klein-Gordon system in Sobolev
spaces of negative index
|
26 pages, 1 figure
| null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that the Cauchy problem for the Dirac-Klein-Gordon system of
equations in 1D is globally well-posed in a range of Sobolev spaces of negative
index for the Dirac spinor and positive index for the scalar field. The main
ingredient in the proof is the theory of almost conservation law and I-method
introduced by Colliander, Keel, Staffilani, Takaoka and Tao. Our proof also
relies on the null structure in the system, and bilinear spacetime estimates of
Klainerman-Machedon type.
|
[{'version': 'v1', 'created': 'Sat, 6 Sep 2008 12:47:25 GMT'}]
|
2008-09-09
|
[array(['Tesfahun', 'Achenef', ''], dtype=object)]
|
1,542 |
0705.3333
|
Peter Nyman
|
Peter Nyman
|
Simulation of Quantum Algorithms with a Symbolic Programming Language
| null | null | null | null |
quant-ph
| null |
This study examines the simulation of quantum algorithms on a classical
computer. The program code implemented on a classical computer will be a
straight connection between the mathematical formulation of quantum mechanics
and computational methods. The computational language will include formulations
such as quantum state, superposition and quantum operator.
|
[{'version': 'v1', 'created': 'Wed, 23 May 2007 10:54:52 GMT'}
{'version': 'v2', 'created': 'Thu, 24 May 2007 14:01:36 GMT'}]
|
2007-06-13
|
[array(['Nyman', 'Peter', ''], dtype=object)]
|
1,543 |
2209.14886
|
Simon May
|
Simon May, Volker Springel
|
The halo mass function and filaments in full cosmological simulations
with fuzzy dark matter
|
18 pages, 13 figures; submitted to MNRAS
| null | null | null |
astro-ph.CO astro-ph.GA gr-qc
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Fuzzy dark matter (FDM) is a dark matter candidate consisting of ultra-light
scalar particles with masses around $10^{-22} \mathrm{eV}/c^2$, a regime where
cold bosonic matter behaves as a collective wave rather than individual
particles. It has increasingly attracted attention due to its rich
phenomenology on astrophysical scales, with implications for the small-scale
tensions present within the standard cosmological model, $\Lambda$CDM. Although
constraints on FDM are accumulating in many different contexts, very few have
been verified by self-consistent numerical simulations. We present new large
numerical simulations of cosmic structure formation with FDM, solving the full
Schr\"odinger-Poisson (SP) equations using the AxiREPO code, which implements a
pseudo-spectral numerical method. Combined with our previous simulations, they
allow us to draw a four-way comparison of matter clustering, contrasting
results (such as power spectra) for each combination of initial conditions (FDM
vs. CDM) and dynamics (SP vs. $N$-body). By disentangling the impact of initial
conditions and non-linear dynamics, we can gauge the validity of approximate
methods used in previous works, such as ordinary $N$-body simulations with an
FDM initial power spectrum. Due to the comparatively large volume achieved in
our FDM simulations, we are able to measure the FDM halo mass function from
full wave simulations for the first time, and compare to previous results
obtained using analytic or approximate approaches. We find that, due to the
cut-off of small-scale power in the FDM power spectrum, haloes are linked via
continuous, smooth, and dense filaments throughout the entire simulation volume
(unlike for the standard $\Lambda$CDM power spectrum), posing significant
challenges for reliably identifying haloes. We also investigate the density
profiles of these filaments and compare to their CDM counterparts.
|
[{'version': 'v1', 'created': 'Thu, 29 Sep 2022 15:54:36 GMT'}]
|
2022-09-30
|
[array(['May', 'Simon', ''], dtype=object)
array(['Springel', 'Volker', ''], dtype=object)]
|
1,544 |
hep-ph/9404319
|
M. B. Paranjape
|
T. Gisiger and M.B. Paranjape
|
Low Energy Nucleon-Nucleon Scattering with the Skyrme Model in the
Geodetic Approximation
|
18 pages, UDEM-LPN-TH-94-196
|
Phys.Rev.D51:3034-3041,1995
|
10.1103/PhysRevD.51.3034
| null |
hep-ph hep-th
| null |
We calculate nucleon-nucleon scattering at low energies and large impact
parameter in the Skyrme model within the framework for soliton scattering
proposed by Manton. This corresponds to a truncation of the degrees of freedom
to the twelve collective coordinates which essentially describe the rigid body
motion of the pair of Skyrmions. We take to its logical conclusion the result
that the induced kinetic energy for these collective coordinates in the product
ansatz behaves as one over the separation and hence can dominate over the
potential. This behaviour implies to leading order that we can drop the
potential and the resulting motion reduces simply to geodesic motion on the
manifold parametrized by the variables of the product ansatz. We formulate the
semi-classical quantization of these variables to obtain the motion
corresponding to the nucleonic states of the Skyrme model. This is the
appropriate description for the nucleons in order to consider their scattering
within Manton's framework in the semi-classical approximation. We investigate
the implications for the scattering of nucleons with various initial
polarizations using the approximation method of ``variation of constants''.
|
[{'version': 'v1', 'created': 'Thu, 21 Apr 1994 17:19:18 GMT'}]
|
2010-11-01
|
[array(['Gisiger', 'T.', ''], dtype=object)
array(['Paranjape', 'M. B.', ''], dtype=object)]
|
1,545 |
2304.04631
|
Igor Cherepanov
|
Igor Cherepanov, Jonathan Geraldi Joewono, Arjan Kuijper, J\"orn
Kohlhammer
|
Extension of Dictionary-Based Compression Algorithms for the
Quantitative Visualization of Patterns from Log Files
|
submitted to EuroVA 2023
| null | null | null |
cs.IR cs.DS cs.HC
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Many services today massively and continuously produce log files of different
and varying formats. These logs are important since they contain information
about the application activities, which is necessary for improvements by
analyzing the behavior and maintaining the security and stability of the
system. It is a common practice to store log files in a compressed form to
reduce the sheer size of these files. A compression algorithm identifies
frequent patterns in a log file to remove redundant information. This work
presents an approach to detect frequent patterns in textual data that can be
simultaneously registered during the file compression process with low
consumption of resources. The log file can be visualized with the possibility
to explore the extracted patterns using metrics based on such properties as
frequency, length and root prefixes of the acquired pattern. This allows an
analyst to gain the relevant insights more efficiently reducing the need for
manual labor-intensive inspection in the log data. The extension of the
implemented dictionary-based compression algorithm has the advantage of
recognizing patterns in log files of any format and eliminates the need to
manually perform preparation for any preprocessing of log files.
|
[{'version': 'v1', 'created': 'Mon, 10 Apr 2023 14:53:39 GMT'}]
|
2023-04-11
|
[array(['Cherepanov', 'Igor', ''], dtype=object)
array(['Joewono', 'Jonathan Geraldi', ''], dtype=object)
array(['Kuijper', 'Arjan', ''], dtype=object)
array(['Kohlhammer', 'Jörn', ''], dtype=object)]
|
1,546 |
2204.07950
|
Fatemah Ayatollah Zadeh Shirazi
|
Fatemah Ayatollah Zadeh Shirazi, Elaheh Hakimi, Arezoo Hosseini, Reza
Rezavand
|
Li-Yorke and Devaney chaotic uniform dynamical systems amongst weighted
shifts
|
15 pages
| null | null | null |
math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, for finite discrete field $F$, nonempty set $\Gamma$, weight
vector $\mathfrak{w}=({\mathfrak w}_\alpha)_{\alpha\in\Gamma}\in F^\Gamma$ and
weighted generalized shift $\sigma_{\varphi,{\mathfrak w}}:F^\Gamma\to
F^\Gamma$, we find necessary and sufficient conditions for uniform dynamical
system $(F^\Gamma,\sigma_{\varphi,{\mathfrak w}})$ to be Li--Yorke chaotic.
Next we find necessary and sufficient conditions for
$(F^\Gamma,\sigma_{\varphi,{\mathfrak w}})$ to be Devaney chaotic.
|
[{'version': 'v1', 'created': 'Sun, 17 Apr 2022 07:40:21 GMT'}]
|
2022-04-19
|
[array(['Shirazi', 'Fatemah Ayatollah Zadeh', ''], dtype=object)
array(['Hakimi', 'Elaheh', ''], dtype=object)
array(['Hosseini', 'Arezoo', ''], dtype=object)
array(['Rezavand', 'Reza', ''], dtype=object)]
|
1,547 |
1811.04003
|
Goncalo Catarina
|
G. Catarina, J. Have, J. Fern\'andez-Rossier, N. M. R. Peres
|
Optical orientation with linearly polarized light in transition metal
dichalcogenides
|
20 pages, 7 figures
|
Phys. Rev. B 99, 125405 (2019)
|
10.1103/PhysRevB.99.125405
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the optical properties of semiconducting transition metal
dichalcogenide monolayers under the influence of strong out-of-plane magnetic
fields, using the effective massive Dirac model. We pay attention to the role
of spin-orbit coupling effects, doping level and electron-electron
interactions, treated at the Hartree-Fock level. We find that optically-induced
valley and spin imbalance, commonly attained with circularly polarized light,
can also be obtained with linearly polarized light in the doped regime.
Additionally, we explore an exchange-driven mechanism to enhance the spin-orbit
splitting of the conduction band, in n-doped systems, controlling both the
carrier density and the intensity of the applied magnetic field.
|
[{'version': 'v1', 'created': 'Fri, 9 Nov 2018 16:30:26 GMT'}
{'version': 'v2', 'created': 'Wed, 13 Mar 2019 16:05:27 GMT'}]
|
2019-03-14
|
[array(['Catarina', 'G.', ''], dtype=object)
array(['Have', 'J.', ''], dtype=object)
array(['Fernández-Rossier', 'J.', ''], dtype=object)
array(['Peres', 'N. M. R.', ''], dtype=object)]
|
1,548 |
2203.03469
|
George Obaido
|
George Obaido
|
PhD thesis: SQL Comprehension and Synthesis
|
219 pages, 60 figures
|
2020
| null | null |
cs.DB cs.FL
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Structured Query Language (SQL) remains the standard language used in
Relational Database Management Systems (RDBMSs) and has found applications in
healthcare (patient registries), businesses (inventories, trend analysis),
military, education, etc. Although SQL statements are English-like, the process
of writing SQL queries is often problematic for nontechnical end-users in the
industry. Similarly, formulating and comprehending written queries can be
confusing, especially for undergraduate students. One of the pivotal reasons
given for these difficulties lies with the simple syntax of SQL, which is often
misleading and hard to understand. An ideal solution is to present these two
audiences: undergraduate students and nontechnical end-users with learning and
practice tools. These tools are mostly electronic and can be used to aid their
understanding, as well as enable them to write correct SQL queries. This work
proposes a new approach aimed at understanding and writing correct SQL queries
using principles from Formal Language and Automata Theory. We present
algorithms based on: regular expressions for the recognition of simple query
constructs, context-free grammars for the recognition of nested queries, and a
jumping finite automaton for the synthesis of SQL queries from natural language
descriptions. As proof of concept, these algorithms were further implemented
into interactive software tools aimed at improving SQL comprehension.
Evaluation of these tools showed that the majority of participants agreed that
the tools were intuitive and aided their understanding of SQL queries. These
tools should, therefore, find applications in aiding SQL comprehension at
higher learning institutions and assist in the writing of correct queries in
data-centered industries.
|
[{'version': 'v1', 'created': 'Thu, 3 Mar 2022 01:33:46 GMT'}]
|
2022-03-08
|
[array(['Obaido', 'George', ''], dtype=object)]
|
1,549 |
1312.1388
|
Ron Lifshitz
|
Ron Lifshitz
|
Comment on "Quantum Quasicrystals of Spin-Orbit-Coupled Dipolar Bosons"
| null |
Phys. Rev. Lett. 113 (2014) 079602
|
10.1103/PhysRevLett.113.079602
| null |
cond-mat.stat-mech cond-mat.quant-gas
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a recent Letter, Gopalakrishnan, Martin, and Demler [Phys. Rev. Lett. 111
(2013) 185304] show that quasi-two-dimensional dipolar Bose gases, subject to a
Rashba spin-orbit coupling, exhibit a variety of spatially ordered, or
crystalline, ground states, including a pentagonal quasicrystal. Indeed, as the
authors say, realizing quasicrystalline condensates would provide new ways to
explore the physics of quasicrystals, and in particular to study the quantum
dynamics of their unique collective phason modes. Yet, the authors conclude
that "there are typically additional phasons in quantum-mechanical
quasicrystals, when compared with their classical equivalents." In this Comment
I review the notion of phason modes in quasicrystals, and explain why their
number does not depend on whether they are classical or quantum.
|
[{'version': 'v1', 'created': 'Wed, 4 Dec 2013 23:50:43 GMT'}]
|
2014-09-08
|
[array(['Lifshitz', 'Ron', ''], dtype=object)]
|
1,550 |
1908.03077
|
Selvaprabu Nadarajah
|
Qihang Lin, Selvaprabu Nadarajah, Negar Soheili, Tianbao Yang
|
A Data Efficient and Feasible Level Set Method for Stochastic Convex
Optimization with Expectation Constraints
| null | null | null | null |
math.OC cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Stochastic convex optimization problems with expectation constraints (SOECs)
are encountered in statistics and machine learning, business, and engineering.
In data-rich environments, the SOEC objective and constraints contain
expectations defined with respect to large datasets. Therefore, efficient
algorithms for solving such SOECs need to limit the fraction of data points
that they use, which we refer to as algorithmic data complexity. Recent
stochastic first order methods exhibit low data complexity when handling SOECs
but guarantee near-feasibility and near-optimality only at convergence. These
methods may thus return highly infeasible solutions when heuristically
terminated, as is often the case, due to theoretical convergence criteria being
highly conservative. This issue limits the use of first order methods in
several applications where the SOEC constraints encode implementation
requirements. We design a stochastic feasible level set method (SFLS) for SOECs
that has low data complexity and emphasizes feasibility before convergence.
Specifically, our level-set method solves a root-finding problem by calling a
novel first order oracle that computes a stochastic upper bound on the
level-set function by extending mirror descent and online validation
techniques. We establish that SFLS maintains a high-probability feasible
solution at each root-finding iteration and exhibits favorable iteration
complexity compared to state-of-the-art deterministic feasible level set and
stochastic subgradient methods. Numerical experiments on three diverse
applications validate the low data complexity of SFLS relative to the former
approach and highlight how SFLS finds feasible solutions with small optimality
gaps significantly faster than the latter method.
|
[{'version': 'v1', 'created': 'Wed, 7 Aug 2019 12:59:19 GMT'}
{'version': 'v2', 'created': 'Thu, 2 Jan 2020 01:03:49 GMT'}]
|
2020-01-03
|
[array(['Lin', 'Qihang', ''], dtype=object)
array(['Nadarajah', 'Selvaprabu', ''], dtype=object)
array(['Soheili', 'Negar', ''], dtype=object)
array(['Yang', 'Tianbao', ''], dtype=object)]
|
1,551 |
1708.08825
|
Yuankai Huo
|
Yuankai Huo, Susan M. Resnick and Bennett A. Landman
|
4D Multi-atlas Label Fusion using Longitudinal Images
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Longitudinal reproducibility is an essential concern in automated medical
image segmentation, yet has proven to be an elusive objective as manual brain
structure tracings have shown more than 10% variability. To improve
reproducibility, lon-gitudinal segmentation (4D) approaches have been
investigated to reconcile tem-poral variations with traditional 3D approaches.
In the past decade, multi-atlas la-bel fusion has become a state-of-the-art
segmentation technique for 3D image and many efforts have been made to adapt it
to a 4D longitudinal fashion. However, the previous methods were either limited
by using application specified energy function (e.g., surface fusion and multi
model fusion) or only considered tem-poral smoothness on two consecutive time
points (t and t+1) under sparsity as-sumption. Therefore, a 4D multi-atlas
label fusion theory for general label fusion purpose and simultaneously
considering temporal consistency on all time points is appealing. Herein, we
propose a novel longitudinal label fusion algorithm, called 4D joint label
fusion (4DJLF), to incorporate the temporal consistency modeling via non-local
patch-intensity covariance models. The advantages of 4DJLF include: (1) 4DJLF
is under the general label fusion framework by simul-taneously incorporating
the spatial and temporal covariance on all longitudinal time points. (2) The
proposed algorithm is a longitudinal generalization of a lead-ing joint label
fusion method (JLF) that has proven adaptable to a wide variety of
applications. (3) The spatial temporal consistency of atlases is modeled in a
prob-abilistic model inspired from both voting based and statistical fusion.
The pro-posed approach improves the consistency of the longitudinal
segmentation while retaining sensitivity compared with original JLF approach
using the same set of atlases. The method is available online in open-source.
|
[{'version': 'v1', 'created': 'Tue, 29 Aug 2017 15:33:53 GMT'}]
|
2017-08-30
|
[array(['Huo', 'Yuankai', ''], dtype=object)
array(['Resnick', 'Susan M.', ''], dtype=object)
array(['Landman', 'Bennett A.', ''], dtype=object)]
|
1,552 |
hep-ex/0609012
|
Michiel Sanders
|
Michiel P. Sanders (for the D0 Collaboration, CDF Collaboration)
|
W and Z Production at the Tevatron
|
Presented at the XXXIII International Conference on High Energy
Physics, Moscow, Russian Federation, 26th July - 2nd August 2006
| null | null |
FERMILAB-CONF-06-318-E
|
hep-ex
| null |
In this paper, recent experimental results on W and Z boson production at the
Tevatron are described. These results not only provide tests of the standard
model, but are also sensitive to proton parton distribution functions.
|
[{'version': 'v1', 'created': 'Thu, 7 Sep 2006 16:10:55 GMT'}]
|
2019-08-15
|
[array(['Sanders', 'Michiel P.', '',
'for the D0 Collaboration, CDF Collaboration'], dtype=object)]
|
1,553 |
1209.5243
|
Moreno Marzolla
|
Stefano Ferretti, Vittorio Ghini, Moreno Marzolla and Fabio Panzieri
|
Walking with the Oracle: Efficient Use of Mobile Networks through
Location-Awareness
|
A revised version of this paper appears in Proceedings of Wireless
Days 2012, November 21-23 2012, Dublin, Ireland
| null | null | null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Always Best Packet Switching (ABPS) is a novel approach for wireless
communications that enables mobile nodes, equipped with multiple network
interface cards (NICs), to dynamically determine the most appropriate NIC to
use. Using ABPS, a mobile node can seamlessly switch to a different NIC in
order to get better performance, without causing communication interruptions at
the application level. To make this possible, NICs are kept always active and a
software monitor constantly probes the channels for available access points.
While this ensures maximum connection availability, considerable energy may be
wasted when no access points are available for a given NIC. In this paper we
address this issue by investigating the use of an "oracle" able to provide
information on network availability. This allows to dynamically switch on/off
NICs based on reported availability, thus reducing the power consumption. We
present a Markov model which allows us to estimate the impact of the oracle on
the ABPS mechanism: results show that significant reduction in energy
consumption can be achieved with minimal impact on connection availability. We
conclude by describing a prototype implementation of the oracle based on Web
services and geolocalization.
|
[{'version': 'v1', 'created': 'Mon, 24 Sep 2012 12:17:36 GMT'}]
|
2012-09-25
|
[array(['Ferretti', 'Stefano', ''], dtype=object)
array(['Ghini', 'Vittorio', ''], dtype=object)
array(['Marzolla', 'Moreno', ''], dtype=object)
array(['Panzieri', 'Fabio', ''], dtype=object)]
|
1,554 |
2012.08913
|
Jo\~ao Pedro Ramos
|
Jo\~ao P.G. Ramos
|
Uniform bounds for oscillatory and polynomial Carleson operators
|
12 pages; final version
| null | null | null |
math.CA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that a variety of oscillatory and polynomial Carleson operators are
uniformly bounded on the family of parameters under considerations. As a
particular application of our techniques, we prove uniform bounds for
oscillatory Carleson operators near a single scale version of the quadratic
Carleson operator.
|
[{'version': 'v1', 'created': 'Wed, 16 Dec 2020 12:50:35 GMT'}]
|
2020-12-17
|
[array(['Ramos', 'João P. G.', ''], dtype=object)]
|
1,555 |
1705.05765
|
Akshay Soni
|
Jeya Balaji Balasubramanian, Akshay Soni, Yashar Mehdad, Nikolay
Laptev
|
Online Article Ranking as a Constrained, Dynamic, Multi-Objective
Optimization Problem
|
7 pages
| null | null | null |
cs.AI cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The content ranking problem in a social news website, is typically a function
that maximizes a scalar metric of interest like dwell-time. However, like in
most real-world applications we are interested in more than one metric---for
instance simultaneously maximizing click-through rate, monetization metrics,
dwell-time---and also satisfy the traffic requirements promised to different
publishers. All this needs to be done on online data and under the settings
where the objective function and the constraints can dynamically change; this
could happen if for instance new publishers are added, some contracts are
adjusted, or if some contracts are over.
In this paper, we formulate this problem as a constrained, dynamic,
multi-objective optimization problem. We propose a novel framework that extends
a successful genetic optimization algorithm, NSGA-II, to solve this online,
data-driven problem. We design the modules of NSGA-II to suit our problem. We
evaluate optimization performance using Hypervolume and introduce a confidence
interval metric for assessing the practicality of a solution. We demonstrate
the application of this framework on a real-world Article Ranking problem. We
observe that we make considerable improvements in both time and performance
over a brute-force baseline technique that is currently in production.
|
[{'version': 'v1', 'created': 'Tue, 16 May 2017 15:27:57 GMT'}]
|
2017-05-17
|
[array(['Balasubramanian', 'Jeya Balaji', ''], dtype=object)
array(['Soni', 'Akshay', ''], dtype=object)
array(['Mehdad', 'Yashar', ''], dtype=object)
array(['Laptev', 'Nikolay', ''], dtype=object)]
|
1,556 |
2209.06086
|
Zhu Liu
|
Biqing Zhu, Xuanren Song, Zhu Deng, Wenli Zhao, Da Huo, Taochun Sun,
Piyu Ke, Duo Cui, Chenxi Lu, Haiwang Zhong, Chaopeng Hong, Jian Qiu, Steven
J. Davis, Pierre Gentine, Philippe Ciais, Zhu Liu
|
Carbon Monitor-Power: near-real-time monitoring of global power
generation on hourly to daily scales
| null | null | null | null |
physics.data-an econ.EM
|
http://creativecommons.org/licenses/by/4.0/
|
We constructed a frequently updated, near-real-time global power generation
dataset: Carbon Monitor-Power since January, 2016 at national levels with
near-global coverage and hourly-to-daily time resolution. The data presented
here are collected from 37 countries across all continents for eight source
groups, including three types of fossil sources (coal, gas, and oil), nuclear
energy and four groups of renewable energy sources (solar energy, wind energy,
hydro energy and other renewables including biomass, geothermal, etc.). The
global near-real-time power dataset shows the dynamics of the global power
system, including its hourly, daily, weekly and seasonal patterns as influenced
by daily periodical activities, weekends, seasonal cycles, regular and
irregular events (i.e., holidays) and extreme events (i.e., the COVID-19
pandemic). The Carbon Monitor-Power dataset reveals that the COVID-19 pandemic
caused strong disruptions in some countries (i.e., China and India), leading to
a temporary or long-lasting shift to low carbon intensity, while it had only
little impact in some other countries (i.e., Australia). This dataset offers a
large range of opportunities for power-related scientific research and
policy-making.
|
[{'version': 'v1', 'created': 'Tue, 13 Sep 2022 15:35:34 GMT'}]
|
2022-09-14
|
[array(['Zhu', 'Biqing', ''], dtype=object)
array(['Song', 'Xuanren', ''], dtype=object)
array(['Deng', 'Zhu', ''], dtype=object)
array(['Zhao', 'Wenli', ''], dtype=object)
array(['Huo', 'Da', ''], dtype=object)
array(['Sun', 'Taochun', ''], dtype=object)
array(['Ke', 'Piyu', ''], dtype=object)
array(['Cui', 'Duo', ''], dtype=object)
array(['Lu', 'Chenxi', ''], dtype=object)
array(['Zhong', 'Haiwang', ''], dtype=object)
array(['Hong', 'Chaopeng', ''], dtype=object)
array(['Qiu', 'Jian', ''], dtype=object)
array(['Davis', 'Steven J.', ''], dtype=object)
array(['Gentine', 'Pierre', ''], dtype=object)
array(['Ciais', 'Philippe', ''], dtype=object)
array(['Liu', 'Zhu', ''], dtype=object)]
|
1,557 |
1609.00424
|
Jason Cloud
|
Jason Cloud, Muriel Medard
|
Multi-Path Low Delay Network Codes
|
7 Pages
| null | null | null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The capability of mobile devices to use multiple interfaces to support a
single session is becoming more prevalent. Prime examples include the desire to
implement WiFi offloading and the introduction of 5G. Furthermore, an
increasing fraction of Internet traffic is becoming delay sensitive. These two
trends drive the need to investigate methods that enable communication over
multiple parallel heterogeneous networks, while also ensuring that delay
constraints are met. This paper approaches these challenges using a multi-path
streaming code that uses forward error correction to reduce the in-order
delivery delay of packets in networks with poor link quality and transient
connectivity. A simple analysis is developed that provides a good approximation
of the in-order delivery delay. Furthermore, numerical results help show that
the delay penalty of communicating over multiple paths is insignificant when
considering the potential throughput gains obtained through the fusion of
multiple networks.
|
[{'version': 'v1', 'created': 'Thu, 1 Sep 2016 23:24:06 GMT'}]
|
2016-09-05
|
[array(['Cloud', 'Jason', ''], dtype=object)
array(['Medard', 'Muriel', ''], dtype=object)]
|
1,558 |
1901.08531
|
Daniel Seaton
|
Sivakumara K. Tadikonda, Douglas C. Freesland, Robin R. Minor, Daniel
B. Seaton, Gustave J. Comeyne, Alexander Krimchansky
|
Coronal Imaging with the Solar UltraViolet Imager
| null | null |
10.1007/s11207-019-1411-0
| null |
astro-ph.SR astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the coronal imaging capabilities of the Solar UltraViolet
Imager (SUVI) on the Geostationary Operational Environmental Satellite-R series
spacecraft. Nominally Sun-pointed, SUVI provides solar images in six Extreme
UltraViolet (EUV) wavelengths. On-orbit data indicated that SUVI had sufficient
dynamic range and sensitivity to image the corona to the largest heights above
the Sun to date while simultaneously imaging the Sun. We undertook a campaign
to investigate the existence of the EUV signal well beyond the nominal
Sun-centered imaging area of the solar EUV imagers. We off-pointed SUVI
line-of-sight by almost one imaging area around the Sun. We present the details
of the campaign conducted when the solar cycle is at near the minimum and some
results that affirm the EUV presence to beyond three solar radii.
|
[{'version': 'v1', 'created': 'Thu, 24 Jan 2019 17:52:48 GMT'}]
|
2019-03-20
|
[array(['Tadikonda', 'Sivakumara K.', ''], dtype=object)
array(['Freesland', 'Douglas C.', ''], dtype=object)
array(['Minor', 'Robin R.', ''], dtype=object)
array(['Seaton', 'Daniel B.', ''], dtype=object)
array(['Comeyne', 'Gustave J.', ''], dtype=object)
array(['Krimchansky', 'Alexander', ''], dtype=object)]
|
1,559 |
2112.03437
|
Wolfgang Altmannshofer
|
Wolfgang Altmannshofer, Nathan Lewis
|
Loopy Determinations of $V_{ub}$ and $V_{cb}$
|
23 pages, 4 figures. v2: references added; updated numerics with
latest B mixing lattice results; conclusions unchanged
| null |
10.1103/PhysRevD.105.033004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use loop induced processes like meson oscillations and rare b hadron
decays to determine the absolute values of the CKM matrix elements $|V_{ub}|$
and $|V_{cb}|$ and compare our results to the standard determinations based on
inclusive and exclusive semileptonic tree-level decays of B mesons. For many
years there have been tensions between the inclusive and exclusive
determinations. Assuming the absence of new physics, we find that meson
oscillation data shows a slight preference for the inclusive value of
$|V_{cb}|$ and the exclusive value for $|V_{ub}|$. Rare b decay data prefers
values for $|V_{cb}|$ far below the inclusive and exclusive determinations,
offering a new perspective on some of the persistent rare b decay anomalies.
|
[{'version': 'v1', 'created': 'Tue, 7 Dec 2021 01:12:52 GMT'}
{'version': 'v2', 'created': 'Sat, 18 Dec 2021 21:21:30 GMT'}]
|
2022-03-02
|
[array(['Altmannshofer', 'Wolfgang', ''], dtype=object)
array(['Lewis', 'Nathan', ''], dtype=object)]
|
1,560 |
hep-lat/0611022
|
Daniel Nogradi
|
Gyozo I. Egri, Zoltan Fodor, Christian Hoelbling, Sandor D. Katz,
Daniel Nogradi, Kalman K. Szabo
|
Lattice QCD as a video game
|
11 pages, 2 figures, sample code, new benchmarks added
|
Comput.Phys.Commun.177:631-639,2007
|
10.1016/j.cpc.2007.06.005
| null |
hep-lat
| null |
The speed, bandwidth and cost characteristics of today's PC graphics cards
make them an attractive target as general purpose computational platforms. High
performance can be achieved also for lattice simulations but the actual
implementation can be cumbersome. This paper outlines the architecture and
programming model of modern graphics cards for the lattice practitioner with
the goal of exploiting these chips for Monte Carlo simulations. Sample code is
also given.
|
[{'version': 'v1', 'created': 'Tue, 21 Nov 2006 16:49:01 GMT'}
{'version': 'v2', 'created': 'Mon, 18 Jun 2007 09:37:36 GMT'}]
|
2008-11-26
|
[array(['Egri', 'Gyozo I.', ''], dtype=object)
array(['Fodor', 'Zoltan', ''], dtype=object)
array(['Hoelbling', 'Christian', ''], dtype=object)
array(['Katz', 'Sandor D.', ''], dtype=object)
array(['Nogradi', 'Daniel', ''], dtype=object)
array(['Szabo', 'Kalman K.', ''], dtype=object)]
|
1,561 |
astro-ph/0412079
|
Andrew Witham Mr
|
Andrew Witham, Christian Knigge, Janet Drew, Paul Groot, Robert
Greimel and Quentin Parker
|
Discovering Interacting Binaries with Halpha Surveys
|
4 pages, 3 figures. To appear in the proceedings of the conference
Interacting Binaries in Cefalu, 2004
|
AIP Conf.Proc.797:643-646,2005
|
10.1063/1.2130305
| null |
astro-ph
| null |
A deep (R ~ 19.5) photographic Halpha Survey of the southern Galactic Plane
was recently completed using the UK Schmidt Telescope at the AAO. In addition,
we have recently started a similar, CCD-based survey of the northern Galactic
Plane using the Wide Field Camera on the INT. Both surveys aim to provide
information on many types of emission line objects, such as planetary nebulae,
luminous blue variables and interacting binaries.
Here, we focus specifically on the ability of Halpha emission line surveys to
discover cataclysmic variables (CVs). Follow-up observations have already
begun, and we present initial spectra of a candidate CV discovered by these
surveys. We also present results from analyzing the properties of known CVs in
the Southern Survey. By calculating the recovery rate of these objects, we
estimate the efficiency of Halpha-based searches in finding CVs.
|
[{'version': 'v1', 'created': 'Fri, 3 Dec 2004 12:50:36 GMT'}]
|
2011-03-10
|
[array(['Witham', 'Andrew', ''], dtype=object)
array(['Knigge', 'Christian', ''], dtype=object)
array(['Drew', 'Janet', ''], dtype=object)
array(['Groot', 'Paul', ''], dtype=object)
array(['Greimel', 'Robert', ''], dtype=object)
array(['Parker', 'Quentin', ''], dtype=object)]
|
1,562 |
2203.15015
|
David Ho
|
David Joon Ho, M. Herman Chui, Chad M. Vanderbilt, Jiwon Jung, Mark E.
Robson, Chan-Sik Park, Jin Roh, Thomas J. Fuchs
|
Deep Interactive Learning-based ovarian cancer segmentation of
H&E-stained whole slide images to study morphological patterns of BRCA
mutation
| null | null | null | null |
eess.IV cs.CV
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Deep learning has been widely used to analyze digitized hematoxylin and eosin
(H&E)-stained histopathology whole slide images. Automated cancer segmentation
using deep learning can be used to diagnose malignancy and to find novel
morphological patterns to predict molecular subtypes. To train pixel-wise
cancer segmentation models, manual annotation from pathologists is generally a
bottleneck due to its time-consuming nature. In this paper, we propose Deep
Interactive Learning with a pretrained segmentation model from a different
cancer type to reduce manual annotation time. Instead of annotating all pixels
from cancer and non-cancer regions on giga-pixel whole slide images, an
iterative process of annotating mislabeled regions from a segmentation model
and training/finetuning the model with the additional annotation can reduce the
time. Especially, employing a pretrained segmentation model can further reduce
the time than starting annotation from scratch. We trained an accurate ovarian
cancer segmentation model with a pretrained breast segmentation model by 3.5
hours of manual annotation which achieved intersection-over-union of 0.74,
recall of 0.86, and precision of 0.84. With automatically extracted high-grade
serous ovarian cancer patches, we attempted to train another deep learning
model to predict BRCA mutation. The segmentation model and code have been
released at https://github.com/MSKCC-Computational-Pathology/DMMN-ovary.
|
[{'version': 'v1', 'created': 'Mon, 28 Mar 2022 18:21:17 GMT'}]
|
2022-03-30
|
[array(['Ho', 'David Joon', ''], dtype=object)
array(['Chui', 'M. Herman', ''], dtype=object)
array(['Vanderbilt', 'Chad M.', ''], dtype=object)
array(['Jung', 'Jiwon', ''], dtype=object)
array(['Robson', 'Mark E.', ''], dtype=object)
array(['Park', 'Chan-Sik', ''], dtype=object)
array(['Roh', 'Jin', ''], dtype=object)
array(['Fuchs', 'Thomas J.', ''], dtype=object)]
|
1,563 |
nucl-ex/0607002
|
Stanis{\l}aw Kistryn
|
St. Kistryn, E. Stephan, B. Klos, A. Biegun, K. Bodek, I. Ciepal, A.
Deltuva, A. Fonseca, N. Kalantar-Nayestanaki, M. Kis, A. Kozela, M.
Mahjour-Shafiei, A. Micherdzinska, P. U. Sauer, R. Sworst, J. Zejma, W.
Zipper
|
Evidence of the Coulomb force effects in the cross sections of the
deuteron-proton breakup at 130 MeV
|
9 pages, 3 figures, submitted to Physics Letters B
|
Phys.Lett. B641 (2006) 23-27
|
10.1016/j.physletb.2006.08.013
| null |
nucl-ex
| null |
High precision cross-section data of the deuteron-proton breakup reaction at
130 MeV deuteron energy are compared with the theoretical predictions obtained
with a coupled-channel extension of the CD Bonn potential with virtual
Delta-isobar excitation, without and with inclusion of the long-range Coulomb
force. The Coulomb effect is studied on the basis of the cross-section data
set, extended in this work to about 1500 data points by including breakup
geometries characterized by small polar angles of the two protons. The
experimental data clearly prefer predictions obtained with the Coulomb
interaction included. The strongest effects are observed in regions in which
the relative energy of the two protons is the smallest.
|
[{'version': 'v1', 'created': 'Mon, 3 Jul 2006 13:10:11 GMT'}]
|
2009-11-11
|
[array(['Kistryn', 'St.', ''], dtype=object)
array(['Stephan', 'E.', ''], dtype=object)
array(['Klos', 'B.', ''], dtype=object)
array(['Biegun', 'A.', ''], dtype=object)
array(['Bodek', 'K.', ''], dtype=object)
array(['Ciepal', 'I.', ''], dtype=object)
array(['Deltuva', 'A.', ''], dtype=object)
array(['Fonseca', 'A.', ''], dtype=object)
array(['Kalantar-Nayestanaki', 'N.', ''], dtype=object)
array(['Kis', 'M.', ''], dtype=object)
array(['Kozela', 'A.', ''], dtype=object)
array(['Mahjour-Shafiei', 'M.', ''], dtype=object)
array(['Micherdzinska', 'A.', ''], dtype=object)
array(['Sauer', 'P. U.', ''], dtype=object)
array(['Sworst', 'R.', ''], dtype=object)
array(['Zejma', 'J.', ''], dtype=object)
array(['Zipper', 'W.', ''], dtype=object)]
|
1,564 |
cond-mat/9209022
|
Alessandro Pelizzola
|
Alessandro Pelizzola and Corrado Topi
|
Generalized Coherent States for Dynamical Superalgebras
|
42 pages
| null | null | null |
cond-mat
| null |
Coherent states for a general Lie superalgebra are defined following the
method originally proposed by Perelomov. Algebraic and geometrical properties
of the systems of states thus obtained are examined, with particular attention
to the possibility of defining a K\"ahler structure over the states
supermanifold and to the connection between this supermanifold and the
coadjoint orbits of the dynamical supergroup. The theory is then applied to
some compact forms of contragradient Lie superalgebras.
|
[{'version': 'v1', 'created': 'Fri, 18 Sep 1992 14:54:00 GMT'}]
|
2007-05-23
|
[array(['Pelizzola', 'Alessandro', ''], dtype=object)
array(['Topi', 'Corrado', ''], dtype=object)]
|
1,565 |
physics/0411173
|
Debabrata Biswas
|
Debabrata Biswas, Raghwendra Kumar and R.R.Puri
|
Power loss in open cavity diodes and a modified Child Langmuir Law
|
revtex4, 11 figures
|
Physics of Plasmas 12, 093102 (2005)
|
10.1063/1.2030387
| null |
physics.plasm-ph physics.gen-ph
| null |
Diodes used in most high power devices are inherently open. It is shown that
under such circumstances, there is a loss of electromagnetic radiation leading
to a lower critical current as compared to closed diodes. The power loss can be
incorporated in the standard Child-Langmuir framework by introducing an
effective potential. The modified Child-Langmuir law can be used to predict the
maximum power loss for a given plate separation and potential difference as
well as the maximum transmitted current for this power loss. The effectiveness
of the theory is tested numerically.
|
[{'version': 'v1', 'created': 'Fri, 19 Nov 2004 06:00:38 GMT'}
{'version': 'v2', 'created': 'Tue, 26 Jul 2005 04:59:35 GMT'}]
|
2009-11-10
|
[array(['Biswas', 'Debabrata', ''], dtype=object)
array(['Kumar', 'Raghwendra', ''], dtype=object)
array(['Puri', 'R. R.', ''], dtype=object)]
|
1,566 |
cond-mat/0611769
|
Hans-Werner Hammer
|
H.-W. Hammer, Timo A. Lahde, L. Platter
|
Effective Range Corrections to Three-Body Recombination for Atoms with
Large Scattering Length
|
6 pages, 2 figures, improved discussion, final version
|
Phys.Rev.A75:032715,2007
|
10.1103/PhysRevA.75.032715
|
HISKP-TH-06/38, NT@UW-06-29
|
cond-mat.other nucl-th
| null |
Few-body systems with large scattering length a have universal properties
that do not depend on the details of their interactions at short distances. The
rate constant for three-body recombination of bosonic atoms of mass m into a
shallow dimer scales as \hbar a^4/m times a log-periodic function of the
scattering length. We calculate the leading and subleading corrections to the
rate constant which are due to the effective range of the atoms and study the
correlation between the rate constant and the atom-dimer scattering length. Our
results are applied to 4He atoms as a test case.
|
[{'version': 'v1', 'created': 'Thu, 30 Nov 2006 13:55:46 GMT'}
{'version': 'v2', 'created': 'Thu, 29 Mar 2007 08:55:22 GMT'}]
|
2008-11-26
|
[array(['Hammer', 'H. -W.', ''], dtype=object)
array(['Lahde', 'Timo A.', ''], dtype=object)
array(['Platter', 'L.', ''], dtype=object)]
|
1,567 |
1411.0340
|
Shenglong Xu
|
Shenglong Xu, Yi Li, Congjun Wu
|
Sign problem free quantum Monte-Carlo study on thermodynamic properties
and magnetic phase transitions in orbital-active itinerant ferromagnets
|
17 pages, 17 figures
|
Phys. Rev. X 5, 021032 (2015)
|
10.1103/PhysRevX.5.021032
| null |
cond-mat.str-el cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The microscopic mechanism of itinerant ferromagnetism is a long-standing
problem due to the lack of non-perturbative methods to handle strong magnetic
fluctuations of itinerant electrons. We have non-pertubatively studied
thermodynamic properties and magnetic phase transitions of a two-dimensional
multi-orbital Hubbard model exhibiting ferromagnetic ground states. Quantum
Monte-Carlo simulations are employed, which are proved in a wide density region
free of the sign problem usually suffered by simulations for fermions. Both
Hund's coupling and electron itinerancy are essential for establishing the
ferromagnetic coherence. No local magnetic moments exist in the system as a
priori, nevertheless, the spin channel remains incoherent showing the
Curie-Weiss type spin magnetic susceptibility down to very low temperatures at
which the charge channel is already coherent exhibiting a weakly
temperature-dependent compressibility. For the SU(2) invariant systems, the
spin susceptibility further grows exponentially as approaching zero temperature
in two dimensions. In the paramagnetic phase close to the Curie temperature,
the momentum space Fermi distributions exhibit strong resemblance to those in
the fully polarized state. The long-range ferromagnetic ordering appears when
the symmetry is reduced to the Ising class, and the Curie temperature is
accurately determined. These simulations provide helpful guidance to searching
for novel ferromagnetic materials in both strongly correlated $d$-orbital
transition metal oxide layers and the $p$-orbital ultra-cold atom optical
lattice systems.
|
[{'version': 'v1', 'created': 'Mon, 3 Nov 2014 00:26:20 GMT'}
{'version': 'v2', 'created': 'Sun, 19 Apr 2015 18:41:56 GMT'}]
|
2018-03-01
|
[array(['Xu', 'Shenglong', ''], dtype=object)
array(['Li', 'Yi', ''], dtype=object)
array(['Wu', 'Congjun', ''], dtype=object)]
|
1,568 |
1804.04023
|
Jonathan Bares
|
Jonathan Bar\'es and Aliz\'ee Dubois and Lamine Hattali and Davy
Dalmas and Daniel Bonamy
|
Aftershock sequences and seismic-like organization of acoustic events
produced by a single propagating crack
|
30 pages
|
Bar\'es, J., Dubois, A., Hattali, L., Dalmas, D., & Bonamy, D.
(2018). Aftershock sequences and seismic-like organization of acoustic events
produced by a single propagating crack. Nature Communications, 9(1), 1253
|
10.1038/s41467-018-03559-4
| null |
cond-mat.stat-mech cond-mat.soft physics.geo-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Brittle fractures of inhomogeneous materials like rocks, concrete, or
ceramics are of two types: Nominally brittle and driven by the propagation of a
single dominant crack or quasi-brittle and resulting from the accumulation of
many microcracks. The latter goes along with acoustic noise, whose analysis has
revealed that events form aftershock sequences obeying characteristic laws
reminiscent of those in seismology. Yet, their origin lacks explanation. Here
we show that such a statistical organization is not only specific to the
multi-cracking situations of quasi-brittle failure and seismology, but also
rules the acoustic events produced by a propagating crack. This simpler
situation has permitted us to relate these laws to the overall scale-free
distribution of inter-event time and energy and to uncover their selection by
the crack speed. These results provide a comprehensive picture of how acoustic
events are organized upon material failure in the most fundamental of fracture
states: single propagating cracks.
|
[{'version': 'v1', 'created': 'Wed, 11 Apr 2018 14:36:27 GMT'}]
|
2018-04-12
|
[array(['Barés', 'Jonathan', ''], dtype=object)
array(['Dubois', 'Alizée', ''], dtype=object)
array(['Hattali', 'Lamine', ''], dtype=object)
array(['Dalmas', 'Davy', ''], dtype=object)
array(['Bonamy', 'Daniel', ''], dtype=object)]
|
1,569 |
1610.09105
|
Dong Liu
|
Dong E. Liu, Alex Levchenko, and Roman M. Lutchyn
|
Keldysh approach to periodically driven systems with a fermionic bath:
non-equilibrium steady state, proximity effect and dissipation
|
15 pages, 9 figures
|
Phys. Rev. B 95, 115303 (2017)
|
10.1103/PhysRevB.95.115303
| null |
cond-mat.supr-con cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study properties of a periodically driven system coupled to a thermal
bath. As a nontrivial example, we consider periodically driven metallic system
coupled to a superconducting bath. The effect of the superconductor on the
driven system is two-fold: it (a) modifies density of states in the metal via
the proximity effect and (b) acts as a thermal bath for light-excited
quasi-particles. Using Keldysh formalism, we calculate, nonpertubatively in the
system-bath coupling, the steady-state properties of the system and obtain
non-equilibrium distribution function. The latter allows one to calculate
observable quantities which can be spectroscopically measured in tunneling
experiments.
|
[{'version': 'v1', 'created': 'Fri, 28 Oct 2016 07:59:54 GMT'}]
|
2017-03-15
|
[array(['Liu', 'Dong E.', ''], dtype=object)
array(['Levchenko', 'Alex', ''], dtype=object)
array(['Lutchyn', 'Roman M.', ''], dtype=object)]
|
1,570 |
1203.0708
|
Frank Palladino
|
Gabriel Lugo and Frank J. Palladino
|
On rational systems in the plane. I. Riccati Cases
| null | null | null | null |
math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper is the first in a series of papers which will address, on a case
by case basis, the special cases of the following rational system in the plane,
labeled system #11. $$x_{n+1}=\frac{\alpha_{1}}{A_{1}+y_{n}},\quad
y_{n+1}=\frac{\alpha_{2}+\beta_{2}x_{n}+\gamma_{2}y_{n}}{A_{2}+B_{2}x_{n}+C_{2}y_{n}},\quad
n=0,1,2,...,$$ with $\alpha_{1},A_{1}>0$ and $\alpha_{2}, \beta_{2},
\gamma_{2}, A_{2}, B_{2}, C_{2}\geq 0$ and $\alpha_{2}+\beta_{2}+\gamma_{2}>0$
and $A_{2}+B_{2}+C_{2}>0$ and nonnegative initial conditions $x_{0}$ and
$y_{0}$ so that the denominator is never zero. In this article we focus on the
special cases which are reducible to the Riccati difference equation.
|
[{'version': 'v1', 'created': 'Sun, 4 Mar 2012 04:55:55 GMT'}]
|
2012-03-06
|
[array(['Lugo', 'Gabriel', ''], dtype=object)
array(['Palladino', 'Frank J.', ''], dtype=object)]
|
1,571 |
2111.09941
|
Anton Zabrodin
|
P. Wiegmann, A. Zabrodin
|
Dyson gas on a curved contour
|
35 pages, no figures
| null |
10.1088/1751-8121/ac5a8f
|
ITEP-TH-30/21
|
math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce and study a model of a logarithmic gas with inverse temperature
$\beta$ on an arbitrary smooth closed contour in the plane. This model
generalizes Dyson's gas (the $\beta$-ensemble) on the unit circle. We compute
the non-vanishing terms of the large $N$ expansion of the free energy ($N$ is
the number of particles) by iterating the "loop equation" that is the Ward
identity with respect to reparametrizations and dilatation of the contour. We
show that the main contribution to the free energy is expressed through the
spectral determinant of the Neumann jump operator associated with the contour,
or equivalently through the Fredholm determinant of the Neumann-Poincare
(double layer) operator. This result connects the statistical mechanics of the
Dyson gas to the spectral geometry of the interior and exterior domains of the
supporting contour.
|
[{'version': 'v1', 'created': 'Thu, 18 Nov 2021 20:47:08 GMT'}
{'version': 'v2', 'created': 'Sat, 5 Mar 2022 19:26:43 GMT'}]
|
2022-04-13
|
[array(['Wiegmann', 'P.', ''], dtype=object)
array(['Zabrodin', 'A.', ''], dtype=object)]
|
1,572 |
1703.10428
|
Marcelo Lares
|
Marcelo Lares, Andr\'es N. Ruiz, Heliana E. Luparello, Laura
Ceccarelli, Diego Garcia Lambas and Dante J. Paz
|
The sparkling Universe: Clustering of voids and void clumps
|
Accepted for publication on MNRAS, 9 pages, 5 figures
| null |
10.1093/mnras/stx825
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse the clustering of cosmic voids using a numerical simulation and
the main galaxy sample from the Sloan Digital Sky Survey. We take into account
the classification of voids into two types that resemble different evolutionary
modes: those with a rising integrated density profile (void-in-void mode, or
R-type) and voids with shells (void-in-cloud mode, or S-type). The results show
that voids of the same type have stronger clustering than the full sample. We
use the correlation analysis to define void clumps, associations with at least
two voids separated by a distance of at most the mean void separation. In order
to study the spatial configuration of void clumps, we compute the minimal
spanning tree and analyse their multiplicity, maximum length and elongation
parameter. We further study the dynamics of the smaller sphere that encloses
all the voids in each clump. Although the global densities of void clumps are
different according to their member-void types, the bulk motions of these
spheres are remarkably lower than those of randomly placed spheres with the
same radii distribution. In addition, the coherence of pairwise void motions
does not strongly depend on whether voids belong to the same clump. Void clumps
are useful to analyse the large-scale flows around voids, since voids embedded
in large underdense regions are mostly in the void-in-void regime, were the
expansion of the larger region produces the separation of voids. Similarly,
voids around overdense regions form clumps that are in collapse, as reflected
in the relative velocities of voids that are mostly approaching.
|
[{'version': 'v1', 'created': 'Thu, 30 Mar 2017 12:05:10 GMT'}]
|
2017-05-31
|
[array(['Lares', 'Marcelo', ''], dtype=object)
array(['Ruiz', 'Andrés N.', ''], dtype=object)
array(['Luparello', 'Heliana E.', ''], dtype=object)
array(['Ceccarelli', 'Laura', ''], dtype=object)
array(['Lambas', 'Diego Garcia', ''], dtype=object)
array(['Paz', 'Dante J.', ''], dtype=object)]
|
1,573 |
1703.05386
|
Nicola Astudillo-Defru
|
N. Astudillo-Defru, T. Forveille, X. Bonfils, D. S\'egransan, F.
Bouchy, X. Delfosse, C. Lovis, M. Mayor, F. Murgas, F. Pepe, N. C. Santos, S.
Udry, A. Wunsche
|
The HARPS search for southern extra-solar planets XLI. A dozen planets
around the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628, and GJ 3293
|
19 pages, 24 figures. Astronomy and Astrophysics in press
|
A&A 602, A88 (2017)
|
10.1051/0004-6361/201630153
| null |
astro-ph.EP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Context. Low mass stars are currently the best targets for searches for rocky
planets in the habitable zone of their host star. Over the last 13 years,
precise radial velocities measured with the HARPS spectrograph have identified
over a dozen super-Earths and Earth-mass planets (msin i<10Mearth ) around M
dwarfs, with a well understood selection function. This well defined sample
informs on their frequency of occurrence and on the distribution of their
orbital parameters, and therefore already constrains our understanding of
planetary formation. The subset of these low-mass planets that were found
within the habitable zone of their host star also provide prized targets for
future atmospheric biomarkers searches. Aims. We are working to extend this
planetary sample to lower masses and longer periods through dense and long-term
monitoring of the radial velocity of a small M dwarf sample. Methods. We
obtained large numbers of HARPS spectra for the M dwarfs GJ 3138, GJ 3323, GJ
273, GJ 628 and GJ 3293, from which we derived radial velocities (RVs) and
spectroscopic activity indicators. We searched them for variabilities,
periodicities, Keplerian modulations and correlations, and attribute the
radial-velocity variations to combinations of planetary companions and stellar
activity. Results. We detect 12 planets, of which 9 are new with masses ranging
from 1.17 to 10.5 Mearth . Those planets have relatively short orbital periods
(P<40 d), except two of them with periods of 217.6 and 257.8 days. Among these
systems, GJ 273 harbor two planets with masses close to the one of the Earth.
With a distance of 3.8 parsec only, GJ 273 is the second nearest known
planetary system - after Proxima Centauri - with a planet orbiting the
circumstellar habitable zone.
|
[{'version': 'v1', 'created': 'Wed, 15 Mar 2017 21:11:30 GMT'}
{'version': 'v2', 'created': 'Wed, 21 Jun 2017 18:15:47 GMT'}]
|
2017-06-23
|
[array(['Astudillo-Defru', 'N.', ''], dtype=object)
array(['Forveille', 'T.', ''], dtype=object)
array(['Bonfils', 'X.', ''], dtype=object)
array(['Ségransan', 'D.', ''], dtype=object)
array(['Bouchy', 'F.', ''], dtype=object)
array(['Delfosse', 'X.', ''], dtype=object)
array(['Lovis', 'C.', ''], dtype=object)
array(['Mayor', 'M.', ''], dtype=object)
array(['Murgas', 'F.', ''], dtype=object)
array(['Pepe', 'F.', ''], dtype=object)
array(['Santos', 'N. C.', ''], dtype=object)
array(['Udry', 'S.', ''], dtype=object)
array(['Wunsche', 'A.', ''], dtype=object)]
|
1,574 |
2203.11058
|
Sungmin Yoo
|
Jae-Hyouk Lee, Kyeong-Dong Park, Sungmin Yoo
|
K-stability of Gorenstein Fano group compactifications with rank two
|
33 pages, 8 figures
|
International Journal of Mathematics, Vol. 33 (2022), No. 13,
Article number 2250083
|
10.1142/S0129167X22500835
| null |
math.DG math.AG math.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give a classification of Gorenstein Fano bi-equivariant compactifications
of semisimple complex Lie groups with rank two, and determine which of them are
equivariant K-stable and admit (singular) K\"{a}hler-Einstein metrics. As a
consequence, we obtain several explicit examples of K-stable Fano varieties
admitting (singular) K\"{a}hler-Einstein metrics. We also compute the greatest
Ricci lower bounds, equivalently the delta invariants for K-unstable varieties.
This gives us three new examples on which each solution of the K\"{a}hler-Ricci
flow is of type II.
|
[{'version': 'v1', 'created': 'Mon, 21 Mar 2022 15:28:18 GMT'}
{'version': 'v2', 'created': 'Fri, 16 Sep 2022 13:26:49 GMT'}]
|
2023-07-06
|
[array(['Lee', 'Jae-Hyouk', ''], dtype=object)
array(['Park', 'Kyeong-Dong', ''], dtype=object)
array(['Yoo', 'Sungmin', ''], dtype=object)]
|
1,575 |
1002.1358
|
Ruben Manvelyan
|
Ruben Manvelyan, Karapet Mkrtchyan and Werner Ruehl
|
Direct construction of a cubic selfinteraction for higher spin gauge
fields
|
Latex, 20 pages, v.2 minor changes, references added, v.3 accepted in
Nucl.Phys.B
| null |
10.1016/j.nuclphysb.2010.11.009
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using Noether's procedure we directly construct a complete cubic
selfinteraction for the case of spin s=4 in a flat background and discuss the
cubic selfinteraction for general spin s with s derivatives in the same
background. The leading term of the latter interaction together with the
leading gauge transformation of first field order are presented.
|
[{'version': 'v1', 'created': 'Sat, 6 Feb 2010 13:13:23 GMT'}
{'version': 'v2', 'created': 'Thu, 21 Oct 2010 08:36:02 GMT'}
{'version': 'v3', 'created': 'Thu, 18 Nov 2010 07:49:35 GMT'}]
|
2015-05-18
|
[array(['Manvelyan', 'Ruben', ''], dtype=object)
array(['Mkrtchyan', 'Karapet', ''], dtype=object)
array(['Ruehl', 'Werner', ''], dtype=object)]
|
1,576 |
cond-mat/0308292
|
Masatsugu Suzuki
|
Masatsugu Suzuki, Itsuko S. Suzuki and J\"urgen Walter
|
Superconductivity and spin-glass like behavior in system with Pd sheet
sandwiched between graphene sheets
|
21 pages, 15 figures; submitted to J. Phys.: Condensed Matter
|
J. Phys.: Condens. Matter 16 (2004) 903-918
|
10.1088/0953-8984/16/6/018
| null |
cond-mat.supr-con
| null |
Pd-metal graphite (Pd-MG) has a layered structure, where each Pd sheet is
sandwiched between adjacent graphene sheets. DC magnetization and AC magnetic
susceptibility of Pd-MG have been measured using a SQUID magnetometer. Pd-MG
undergoes a superconducting transition at $T_{c}$ ($= 3.63 \pm 0.04$ K). The
superconductivity occurs in Pd sheets. The relaxation of $M_{ZFC}$ (aging),
which is common to spin glass systems, is also observed below $T_{c}$. The
relaxation rate $S(t)$ shows a peak at a characteristic time $t_{cr}$, which is
longer than a wait time $t_{w}$. The irreversibility between $\chi_{ZFC}$ and
$\chi_{FC}$ occurs well above $T_{c}$. The susceptibility $\chi_{FC}$ obeys a
Curie-Weiss behavior with a negative Curie-Weiss temperature ($-13.1 \leq
\Theta \leq -5.4$ K). The growth of antiferromagnetic order is limited by the
disordered nature of nanographites, forming spin glass-like behavior at low
temperatures in graphene sheets.
|
[{'version': 'v1', 'created': 'Thu, 14 Aug 2003 16:36:12 GMT'}]
|
2016-08-16
|
[array(['Suzuki', 'Masatsugu', ''], dtype=object)
array(['Suzuki', 'Itsuko S.', ''], dtype=object)
array(['Walter', 'Jürgen', ''], dtype=object)]
|
1,577 |
1101.3373
|
Gao Xianlong
|
Gao Xianlong
|
Effects of interaction and polarization on spin-charge separation: A
time-dependent spin-density-functional theory study
|
8 pages, 9 figures
|
Phys. Rev. B 81, 104306 (2010)
|
10.1103/PhysRevB.81.104306
| null |
cond-mat.str-el cond-mat.quant-gas
|
http://creativecommons.org/licenses/by/3.0/
|
We calculate the nonequilibrium dynamic evolution of a one-dimensional system
of two-component fermionic atoms after a strong local quench by using a
time-dependent spin-density-functional theory. The interaction quench is also
considered to see its influence on the spin-charge separation. It is shown that
the charge velocity is larger than the spin velocity for the system of on-site
repulsive interaction (Luttinger liquid), and vise versa for the system of
on-site attractive interaction (Luther-Emery liquid). We find that both the
interaction quench and polarization suppress the spin-charge separation.
|
[{'version': 'v1', 'created': 'Tue, 18 Jan 2011 03:01:48 GMT'}]
|
2015-05-27
|
[array(['Xianlong', 'Gao', ''], dtype=object)]
|
1,578 |
1906.03594
|
Arnaud Beauville
|
Arnaud Beauville
|
Vector bundles on Fano threefolds and K3 surfaces
|
Results of {\S}7 improved and extended using the paper [B-F] by
Brambilla and Faenzi
| null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let X be a Fano threefold, and let S be a K3 surface in X . Any moduli space
M of simple vector bundles on S carries a holomorphic symplectic structure.
Following an idea of Tyurin, we show that in some cases, those vector bundles
which come from X form a Lagrangian subvariety of M . We illustrate this with a
number of concrete examples.
|
[{'version': 'v1', 'created': 'Sun, 9 Jun 2019 08:37:24 GMT'}
{'version': 'v2', 'created': 'Wed, 7 Aug 2019 14:50:09 GMT'}]
|
2019-08-08
|
[array(['Beauville', 'Arnaud', ''], dtype=object)]
|
1,579 |
1505.05334
|
Waldemar Koczkodaj Prof.
|
W.W. Koczkodaj, M.W. Herman, M. Orlowski
|
Managing Null Entries in Pairwise Comparisons
|
5 pages
| null | null | null |
cs.OH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper shows how to manage null entries in pairwise comparisons matrices.
Although assessments can be imprecise, since subjective criteria are involved,
the classical pairwise comparisons theory expects all of them to be available.
In practice, some experts may not be able (or available) to provide all
assessments. Therefore managing null entries is a necessary extension of the
pairwise comparisons method. It is shown that certain null entries can be
recovered on the basis of the transitivity property which each pairwise
comparisons matrix is expected to satisfy.
|
[{'version': 'v1', 'created': 'Wed, 20 May 2015 11:58:22 GMT'}]
|
2015-05-21
|
[array(['Koczkodaj', 'W. W.', ''], dtype=object)
array(['Herman', 'M. W.', ''], dtype=object)
array(['Orlowski', 'M.', ''], dtype=object)]
|
1,580 |
2104.09549
|
Michael Shvartsman
|
Lucy Owen, Jonathan Browder, Benjamin Letham, Gideon Stocek, Chase
Tymms and Michael Shvartsman
|
Adaptive Nonparametric Psychophysics
| null | null | null | null |
stat.ME q-bio.NC
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We introduce a new set of models and adaptive psychometric testing methods
for multidimensional psychophysics. In contrast to traditional adaptive
staircase methods like PEST and QUEST, the method is multi-dimensional and does
not require a grid over contextual dimensions, retaining sub-exponential
scaling in the number of stimulus dimensions. In contrast to more recent
multi-dimensional adaptive methods, our underlying model does not require a
parametric assumption about the interaction between intensity and the
additional dimensions. In addition, we introduce a new active sampling policy
that explicitly targets psychometric detection threshold estimation and does so
substantially faster than policies that attempt to estimate the full
psychometric function (though it still provides estimates of the function,
albeit with lower accuracy). Finally, we introduce AEPsych, a user-friendly
open-source package for nonparametric psychophysics that makes these
technically-challenging methods accessible to the broader community.
|
[{'version': 'v1', 'created': 'Mon, 19 Apr 2021 18:19:59 GMT'}]
|
2021-04-21
|
[array(['Owen', 'Lucy', ''], dtype=object)
array(['Browder', 'Jonathan', ''], dtype=object)
array(['Letham', 'Benjamin', ''], dtype=object)
array(['Stocek', 'Gideon', ''], dtype=object)
array(['Tymms', 'Chase', ''], dtype=object)
array(['Shvartsman', 'Michael', ''], dtype=object)]
|
1,581 |
2111.13598
|
Pedro Carrilho
|
Pedro Carrilho, Karim Carrion, Benjamin Bose, Alkistis Pourtsidou,
Juan Carlos Hidalgo, Lucas Lombriser, Marco Baldi
|
On the road to percent accuracy VI: the nonlinear power spectrum for
interacting dark energy with baryonic feedback and massive neutrinos
|
11 pages, 4 figures. Version 2: version accepted for publication in
MNRAS, including additional explanations and minor corrections. The version
of ReACT used in this work is available at
https://github.com/PedroCarrilho/ReACT/tree/react_with_interact_baryons
| null |
10.1093/mnras/stac641
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Understanding nonlinear structure formation is crucial for fully exploring
the data generated by stage IV surveys, requiring accurate modelling of the
power spectrum. This is challenging for deviations from $\Lambda$CDM, but we
must ensure that alternatives are well tested, to avoid false detections. We
present an extension of the halo model reaction framework for interacting dark
energy. We modify the halo model including the additional force present in the
Dark Scattering model and implement it into ReACT. The reaction is combined
with a pseudo spectrum from EuclidEmulator2 and compared to N-body simulations.
Using standard mass function and concentration-mass relation, we find
predictions to be 1 % accurate at $z=0$ up to $k=0.8~h/{\rm Mpc}$ for the
largest interaction strength tested ($\xi=50$ b/GeV), improving to $2~h/{\rm
Mpc}$ at $z=1$. For smaller interaction strength ($10$ b/GeV), we find 1 %
agreement at $z=1$ up to scales above $3.5~h/{\rm Mpc}$, being close to
$1~h/{\rm Mpc}$ at $z=0$. Finally, we improve our predictions with the
inclusion of baryonic feedback and massive neutrinos and study degeneracies
between the effects of these contributions and those of the interaction.
Limiting the scales to where our modelling is 1 % accurate, we find a
degeneracy between the interaction and feedback, but not with massive
neutrinos. We expect the degeneracy with feedback to be resolvable by including
smaller scales. This work represents the first analytical tool for calculating
the nonlinear spectrum for interacting dark energy models.
|
[{'version': 'v1', 'created': 'Fri, 26 Nov 2021 16:53:08 GMT'}
{'version': 'v2', 'created': 'Mon, 7 Mar 2022 12:00:01 GMT'}]
|
2022-03-14
|
[array(['Carrilho', 'Pedro', ''], dtype=object)
array(['Carrion', 'Karim', ''], dtype=object)
array(['Bose', 'Benjamin', ''], dtype=object)
array(['Pourtsidou', 'Alkistis', ''], dtype=object)
array(['Hidalgo', 'Juan Carlos', ''], dtype=object)
array(['Lombriser', 'Lucas', ''], dtype=object)
array(['Baldi', 'Marco', ''], dtype=object)]
|
1,582 |
2212.04149
|
Chunlan Jin
|
Chunlan Jin, Guiping Zhou, Guiping Ruan, T. Baildon, Wenda Cao and
Jingxiu Wang
|
Magnetic outbreak associated with exploding granulations
|
22 pages, 6 figures, accepted by ApJL
| null |
10.3847/2041-8213/aca97c
| null |
astro-ph.SR physics.space-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Diagnosing the spatial-temporal pattern of magnetic flux on the Sun is vital
for understanding the origin of solar magnetism and activity. Here, we report a
new form of flux appearance, magnetic outbreak, using observations with an
extremely high spatial resolution of 0.16 arcsec from the 1.6-m Goode Solar
Telescope (GST) at the Big Bear Solar Observatory. Magnetic outbreak refers to
an early growth of unipolar magnetic flux and its later explosion into
fragments, in association with plasma upflow and exploding granulations; each
individual fragment has flux of 10$^{16}$-10$^{17}$ Mx, moving apart with
velocity of 0.5-2.2 km/s. The magnetic outbreak takes place in the hecto-Gauss
region of pore moats. In this study, we identify six events of magnetic
outbreak during 6-hour observations over an approximate 40$\times$40
arcsec$^{2}$ field of view. The newly discovered magnetic outbreak might be the
first evidence of the long-anticipated convective blowup.
|
[{'version': 'v1', 'created': 'Thu, 8 Dec 2022 09:07:20 GMT'}]
|
2023-01-04
|
[array(['Jin', 'Chunlan', ''], dtype=object)
array(['Zhou', 'Guiping', ''], dtype=object)
array(['Ruan', 'Guiping', ''], dtype=object)
array(['Baildon', 'T.', ''], dtype=object)
array(['Cao', 'Wenda', ''], dtype=object)
array(['Wang', 'Jingxiu', ''], dtype=object)]
|
1,583 |
cond-mat/0611081
|
Anuradha Jagannathan
|
A. Jagannathan and F. Piechon
|
Energy levels and their correlations in quasicrystals
|
15 pages including 19 figures. Review article, submitted to Phil. Mag
| null |
10.1080/14786430701196990
| null |
cond-mat.str-el
| null |
Quasicrystals can be considered, from the point of view of their electronic
properties, as being intermediate between metals and insulators. For example,
experiments show that quasicrystalline alloys such as AlCuFe or AlPdMn have
conductivities far smaller than those of the metals that these alloys are
composed from. Wave functions in a quasicrystal are typically intermediate in
character between the extended states of a crystal and the exponentially
localized states in the insulating phase, and this is also reflected in the
energy spectrum and the density of states. In the theoretical studies we
consider in this review, the quasicrystals are described by a pure hopping
tight binding model on simple tilings. We focus on spectral properties, which
we compare with those of other complex systems, in particular, the Anderson
model of a disordered metal.
|
[{'version': 'v1', 'created': 'Fri, 3 Nov 2006 10:44:00 GMT'}]
|
2009-11-11
|
[array(['Jagannathan', 'A.', ''], dtype=object)
array(['Piechon', 'F.', ''], dtype=object)]
|
1,584 |
1904.01530
|
Andrea Mignone
|
A. Mignone, G. Mattia, G. Bodo and L. Del Zanna
|
A Constrained Transport Method for the Solution of the Resistive
Relativistic MHD Equations
|
25 pages, 14 figures
| null |
10.1093/mnras/stz1015
| null |
physics.comp-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe a novel Godunov-type numerical method for solving the equations
of resistive relativistic magnetohydrodynamics. In the proposed approach, the
spatial components of both magnetic and electric fields are located at zone
interfaces and are evolved using the constrained transport formalism. Direct
application of Stokes' theorem to Faraday's and Ampere's laws ensures that the
resulting discretization is divergence-free for the magnetic field and
charge-conserving for the electric field. Hydrodynamic variables retain,
instead, the usual zone-centred representation commonly adopted in
finite-volume schemes. Temporal discretization is based on Runge-Kutta
implicit-explicit (IMEX) schemes in order to resolve the temporal scale
disparity introduced by the stiff source term in Ampere's law. The implicit
step is accomplished by means of an improved and more efficient Newton-Broyden
multidimensional root-finding algorithm. The explicit step relies on a
multidimensional Riemann solver to compute the line-averaged electric and
magnetic fields at zone edges and it employs a one-dimensional Riemann solver
at zone interfaces to update zone-centred hydrodynamic quantities. For the
latter, we introduce a five-wave solver based on the frozen limit of the
relaxation system whereby the solution to the Riemann problem can be decomposed
into an outer Maxwell solver and an inner hydrodynamic solver. A number of
numerical benchmarks demonstrate that our method is superior in stability and
robustness to the more popular charge-conserving divergence cleaning approach
where both primary electric and magnetic fields are zone-centered. In addition,
the employment of a less diffusive Riemann solver noticeably improves the
accuracy of the computations.
|
[{'version': 'v1', 'created': 'Tue, 2 Apr 2019 16:37:24 GMT'}]
|
2019-05-01
|
[array(['Mignone', 'A.', ''], dtype=object)
array(['Mattia', 'G.', ''], dtype=object)
array(['Bodo', 'G.', ''], dtype=object)
array(['Del Zanna', 'L.', ''], dtype=object)]
|
1,585 |
1712.00057
|
Iian Smythe
|
Iian B. Smythe
|
Madness in vector spaces
|
09/11/2019: Posted final pre-publication version. Corrections,
reformatting, etc, made to earlier versions. To appear in J. Symb. Logic
|
J. symb. log. 84 (2019) 1590-1611
|
10.1017/jsl.2019.42
| null |
math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider maximal almost disjoint families of block subspaces of countable
vector spaces, focusing on questions of their size and definability. We prove
that the minimum infinite cardinality of such a family cannot be decided in ZFC
and that the "spectrum" of cardinalities of mad families of subspaces can be
made arbitrarily large, in analogy to results for mad families on $\omega$ . We
apply the author's local Ramsey theory for vector spaces to give partial
results concerning their definability.
|
[{'version': 'v1', 'created': 'Thu, 30 Nov 2017 20:09:46 GMT'}
{'version': 'v2', 'created': 'Wed, 11 Sep 2019 13:51:37 GMT'}]
|
2020-02-19
|
[array(['Smythe', 'Iian B.', ''], dtype=object)]
|
1,586 |
1907.00648
|
Wim de Boer
|
Conny Beskidt (1) and Wim de Boer (1) ((1) Dept. of Phys., Karlsruhe
Inst. for Technology KIT, Karlsruhe, Germany)
|
Is the observed 125 GeV Higgs boson expected to be SM-like in the NMSSM?
|
20 pages, 7 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the Next-to Minimal Supersymmetric Standard Model (NMSSM) deviations from
the SM signal strengths of the 125 GeV Higgs boson are expected, because of the
mixing with the additional singlet-like Higgs boson and/or additional decays
into pairs of light particles, like neutralinos, pseudo-scalar Higgs bosons or
singlet Higgs bosons. In this paper the size of the possible deviations and
their expected correlations or anti-correlations between \textit{bosonic} and
\textit{fermionic} final states are analyzed using the efficient parameter
scanning technique with complete coverage presented in a companion paper. The
regions of parameter space with correlated or anti-correlated deviations of the
signal strengths are identified.
|
[{'version': 'v1', 'created': 'Mon, 1 Jul 2019 10:42:04 GMT'}]
|
2019-07-02
|
[array(['Beskidt', 'Conny', ''], dtype=object)
array(['de Boer', 'Wim', ''], dtype=object)]
|
1,587 |
2109.04895
|
Peter Milonni
|
Peter W. Milonni
|
Simplified derivation of the Kompaneets equation
| null | null |
10.1063/5.0063886
| null |
hep-ph physics.plasm-ph
|
http://creativecommons.org/licenses/by/4.0/
|
An isotropic electromagnetic field in a plasma of thermalized electrons
undergoes changes in energy as a result of Compton scattering and an
Einstein-Hopf drag force on the electrons, eventually approaching a
Bose-Einstein photon distribution at the electron temperature. The rate of
change of feld energy due to the combined effects of Compton scattering and the
drag force is shown to be described by the Kompaneets equation for photon
diffusion in frequency space. A similarity is noted between this approach and
Einstein's derivation of the Planck spectrum based on the recoil of atoms as
they absorb and emit radiation.
|
[{'version': 'v1', 'created': 'Wed, 8 Sep 2021 17:11:47 GMT'}]
|
2021-10-04
|
[array(['Milonni', 'Peter W.', ''], dtype=object)]
|
1,588 |
1210.2265
|
Hua-sheng Xie
|
Hua-sheng Xie
|
Pure Monte Carlo Method: a Third Way for Plasma Simulation
|
8 pages, 4 figures, draft, to submit for PRL or CPC or
| null | null | null |
physics.plasm-ph physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We bring a totally new concept for plasma simulation, other than the
conventional two ways: Fluid/Kinetic Continuum (FKC) method and
Particle-in-Cell (PIC) method. This method is based on Pure Monte Carlo (PMC),
but far beyond traditional treatments. PMC solves all the equations (kinetic,
fluid, field) and treats all the procedures (collisions, others) in the system
via MC method. As shown in two paradigms, many advantages have found. It has
shown the capability to be the third importance approach for plasma simulation
or even completely substitute the other two in the future. It's also suitable
for many unsolved problems, then bring plasma simulation to a new era.
|
[{'version': 'v1', 'created': 'Mon, 8 Oct 2012 13:05:54 GMT'}
{'version': 'v2', 'created': 'Wed, 10 Oct 2012 02:25:56 GMT'}]
|
2012-10-11
|
[array(['Xie', 'Hua-sheng', ''], dtype=object)]
|
1,589 |
1206.5906
|
Igor Zinchenko
|
I. Zinchenko (1), S.-Y. Liu (2), Y.-N. Su (2), S. Kurtz (3), D. K.
Ojha (4), M. R. Samal (5) and S. K. Ghosh (6) ((1) Institute of Applied
Physics of the Russian Academy of Sciences, (2) Institute of Astronomy and
Astrophysics, Academia Sinica, Taiwan, (3) Centro de Radioastronomia y
Astrofisica, Universidad Nacional Autonoma de Mexico, (4) Institute of
Fundamental Research, Mumbai, India, (5) Laboratoire d'Astrophysique de
Marseille, France, (6) National Centre for Radio Astrophysics, Tata Institute
of Fundamental Research, Pune, India)
|
A Multi-Wavelength High Resolution Study of the S255 Star Forming
Region. General structure and kinematics
|
21 pages, 26 figures, accepted for publication in Astrophysical
Journal
| null |
10.1088/0004-637X/755/2/177
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present observational data for two main components (S255IR and S255N) of
the S255 high mass star forming region in continuum and molecular lines
obtained at 1.3 mm and 1.1 mm with the SMA, at 1.3 cm with the VLA and at 23
and 50 cm with the GMRT. The angular resolution was from ~ 2" to ~ 5" for all
instruments. With the SMA we detected a total of about 50 spectral lines of 20
different molecules (including isotopologues). About half of the lines and half
of the species (in particular N2H+, SiO, C34S, DCN, DNC, DCO+, HC3N, H2CO,
H2CS, SO2) have not been previously reported in S255IR and partly in S255N at
high angular resolution. Our data reveal several new clumps in the S255IR and
S255N areas by their millimeter wave continuum emission. Masses of these clumps
are estimated at a few solar masses. The line widths greatly exceed expected
thermal widths. These clumps have practically no association with NIR or radio
continuum sources, implying a very early stage of evolution. At the same time,
our SiO data indicate the presence of high-velocity outflows related to some of
these clumps. In some cases, strong molecular emission at velocities of the
quiescent gas has no detectable counterpart in the continuum. We discuss the
main features of the distribution of NH3, N2H+, and deuterated molecules. We
estimate properties of decimeter wave radio continuum sources and their
relationship with the molecular material.
|
[{'version': 'v1', 'created': 'Tue, 26 Jun 2012 07:54:22 GMT'}]
|
2015-06-05
|
[array(['Zinchenko', 'I.', ''], dtype=object)
array(['Liu', 'S. -Y.', ''], dtype=object)
array(['Su', 'Y. -N.', ''], dtype=object)
array(['Kurtz', 'S.', ''], dtype=object)
array(['Ojha', 'D. K.', ''], dtype=object)
array(['Samal', 'M. R.', ''], dtype=object)
array(['Ghosh', 'S. K.', ''], dtype=object)]
|
1,590 |
physics/0006008
|
Georg H. Hoffstaetter
|
Georg H. Hoffstaetter
|
Successive approximations for charged particle motion
| null |
Ultramicroscopy 81 (2000) 111-121
| null |
DESY 00-060
|
physics.acc-ph
| null |
Single particle dynamics in electron microscopes, ion or electron
lithographic instruments, particle accelerators, and particle spectrographs is
described by weakly nonlinear ordinary differential equations. Therefore, the
linear part of the equation of motion is usually solved and the nonlinear
effects are then found in successive order by iteration methods. A Hamiltonian
nature of these equations can lead to simplified computations of particle
transport through an optical device when a suitable computational method is
used. Many ingenious microscopic and lithographic devices were found by H. Rose
and his group due to the simple structure of the eikonal method. In the area of
accelerator physics the eikonal method has never become popular. Here I will
therefore generalize the eikonal method and derive it from a Hamiltonian quite
familiar to the accelerator physics community. With the event of high energy
polarized electron beams and plans for high energy proton beams, nonlinear
effects in spin motion have become important in high energy accelerators. I
will introduce a successive approximation for the nonlinear effects in the
coupled spin and orbit motion of charged particles which resembles some of the
simplifications resulting from the eikonal method for the pure orbit motion.
|
[{'version': 'v1', 'created': 'Mon, 5 Jun 2000 20:40:22 GMT'}]
|
2007-05-23
|
[array(['Hoffstaetter', 'Georg H.', ''], dtype=object)]
|
1,591 |
2204.01295
|
Marcos Faundez-Zanuy
|
Marcos Faundez-Zanuy
|
Nonlinear Vectorial Prediction with Neural Nets
|
9 pages, published in Proceedings of the 6th International Work
Conference on Artificial and Natural Neural Networks: Bio inspired
Applications of Connectionism Part II June 2001 Pages 754 761
|
Lecture Notes in Computer Science LNCS 2085 Vol. II, pages
754-761. IWANN 2001, Granada (Spain) ISSN 0302-9743
|
10.5555/646370.688874
| null |
cs.SD eess.AS
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
In this paper we propose a nonlinear vectorial prediction scheme based on a
Multi Layer Perceptron. This system is applied to speech coding in an ADPCM
backward scheme. In addition a procedure to obtain a vectorial quantizer is
given, in order to achieve a fully vectorial speech encoder. We also present
several results with the proposed system
|
[{'version': 'v1', 'created': 'Mon, 4 Apr 2022 08:04:16 GMT'}]
|
2022-04-05
|
[array(['Faundez-Zanuy', 'Marcos', ''], dtype=object)]
|
1,592 |
1909.06555
|
M Hafiez
|
Abdel-Hafiez, M. Thiyagarajan, R. Majumdar, A. Ahuja, R. Luo, W.
Vasiliev, A. N. Maarouf, A.A. Zybtsev, S.G. Pokrovskii, V. Ya. Zaitsev-Zotov,
S. V. Pavlovskiy, V.V.Woei Wu Pai, Yang, W. and Kulik, L.V
|
Pressure-Induced Re-entrant transition in NbS3 Phases: Combined Raman
Scattering and X-ray Diffraction Study
| null |
Phys. Rev. B 99, 235126 (2019)
|
10.1103/PhysRevB.99.235126
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report the evolution of charge density wave states under pressure for two
NbS3 phases triclinic (phase I) and monoclinic (phase II) at room temperature.
Raman and X-ray diffraction (XRD) techniques are applied. The x-ray studies on
the monoclinic phase under pressure show a compression of the lattice at
different rates below and above 7 GPa but without a change in space group
symmetry. The Raman spectra of the two phases evolve similarly with pressure;
all peaks almost disappear in the 6-8 GPa range, indicating a transition from
an insulating to a metallic state, and peaks at new positions appear above 8
GPa. The results suggest suppression of the ambient charge-density waves and
their subsequent recovery with new orderings above 8 GPa.
|
[{'version': 'v1', 'created': 'Sat, 14 Sep 2019 08:04:22 GMT'}]
|
2019-09-25
|
[array(['Abdel-Hafiez', '', ''], dtype=object)
array(['Thiyagarajan', 'M.', ''], dtype=object)
array(['Majumdar', 'R.', ''], dtype=object)
array(['Ahuja', 'A.', ''], dtype=object)
array(['Luo', 'R.', ''], dtype=object)
array(['Vasiliev', 'W.', ''], dtype=object)
array(['Maarouf', 'A. N.', ''], dtype=object)
array(['Zybtsev', 'A. A.', ''], dtype=object)
array(['Pokrovskii', 'S. G.', ''], dtype=object)
array(['Zaitsev-Zotov', 'V. Ya.', ''], dtype=object)
array(['Pavlovskiy', 'S. V.', ''], dtype=object)
array(['Pai', 'V. V. Woei Wu', ''], dtype=object)
array(['Yang', '', ''], dtype=object) array(['W.', '', ''], dtype=object)
array(['Kulik', '', ''], dtype=object)
array(['V', 'L.', ''], dtype=object)]
|
1,593 |
astro-ph/9804036
|
R. Srianand
|
R. Srianand (IUCAA,Pune), P. Petitjean (IAP,Paris)
|
Molecules in the $z_{\rm abs}$~=~2.8112 damped system toward
PKS~0528--250
|
8 pages, latex, 5 figures (to appear in A&A)
| null | null | null |
astro-ph
| null |
We present a detailed analysis of a high resolution spectrum of the damped
Ly$\alpha$ system at $z_{\rm abs}$~=~2.8112toward PKS~0528-250. The absorption
redshift is slightly larger than the emission redshift of the quasar. We
estimate the column density of H$_2$ molecules
$N$(H$_2$)~$\sim$~6$\times$10$^{16}$~cm$^{-2}$ and the fractional abundance of
H$_2$, $f$~=~5.4$\times$10$^{-5}$. The excitation temperature derived for
different transitions suggests that the kinetic temperature of the cloud is
$\sim$200~K and the density $n$~$\sim$~1000~cm$^{-3}$. The cloud therefore has
a dimension of $\sim$1~pc along the line of sight. Since it obscures the
broad-line emission region, its transverse dimension should be larger than
10~pc.\par We obtain upper limits on the column densities of C~{\sc i}
($<$~10$^{12.7}$~cm$^{-2}$) and CO ($<$~10$^{13.2}$~cm$^{-2}$;
$N$(CO)/$N$(H~{\sc i})~$<$~7$\times$10$^{-9}$).We suggest that the ratio
$N$(H$_2$)/$N$(C~{\sc i}) is a useful indicator of the physical conditions in
the absorber. Simple photo-ionization models assuming solar relative abundances
show that radiation fields with spectra similar to typical AGNs or starbursts
are unable to reproduce all the constraints and in particular the surprisingly
small $N$(C~{\sc i})/ $N$(H$_2$) and $N$(Mg~{\sc i})/$N$(H$_2$) ratios. In view
of the models we explored, the most likely ionizing spectrum is a composite of
a UV- "big bump" possibly produced by a local starburst and a power-law
spectrum from the QSO that provides the X-rays. Dust is needed to explain the
production of molecules in the cloud. The amount of dust is broadly consistent
with the [Cr/Zn] abundance determination.
|
[{'version': 'v1', 'created': 'Fri, 3 Apr 1998 20:06:02 GMT'}]
|
2007-05-23
|
[array(['Srianand', 'R.', '', 'IUCAA,Pune'], dtype=object)
array(['Petitjean', 'P.', '', 'IAP,Paris'], dtype=object)]
|
1,594 |
2305.07640
|
Junaid Majeed Bhat
|
Junaid Majeed Bhat, R. Shankar and Abhishek Dhar
|
Quantized longitudinal conductance and edge states in an open geometry
2-dimensional Chern insulator
|
10 pages, 8 figures
| null | null | null |
cond-mat.mes-hall cond-mat.stat-mech quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Insulators with non-trivial topology support mid-gap modes localized at the
boundaries of the sample. We consider the spinless Bernevig-Hughes-Zhang (SBHZ)
model, one of the simplest models of a Chern insulator, in contact with
external reservoirs (metallic leads) at its opposite ends. We study scattering
states formed by these edge modes using the non-equilibrium Green's function
(NEGF) formalism. These special states give rise to perfect transmission from
one lead to another, leading to quantized two-terminal conductance. We look at
the charge and current density profiles, associated to these modes, in the
insulator as well as in the leads. As expected, we find that the current inside
the insulator is localized along the edges of the sample. Surprisingly, we find
that even in the leads, the current density is localized and shows an
interesting zigzag pattern. We also look at finite-size effects on the
quantized two-terminal conductance and its dependence on system-reservoir
coupling.
|
[{'version': 'v1', 'created': 'Fri, 12 May 2023 17:48:27 GMT'}]
|
2023-05-15
|
[array(['Bhat', 'Junaid Majeed', ''], dtype=object)
array(['Shankar', 'R.', ''], dtype=object)
array(['Dhar', 'Abhishek', ''], dtype=object)]
|
1,595 |
2103.04808
|
Alberto Parravicini
|
Alberto Parravicini, Luca Giuseppe Cellamare, Marco Siracusa, Marco
Domenico Santambrogio
|
Scaling up HBM Efficiency of Top-K SpMV for Approximate Embedding
Similarity on FPGAs
|
To appear in Proceedings of the 58th Design Automation Conference
(DAC)
| null | null | null |
cs.AR cs.IR
|
http://creativecommons.org/licenses/by/4.0/
|
Top-K SpMV is a key component of similarity-search on sparse embeddings. This
sparse workload does not perform well on general-purpose NUMA systems that
employ traditional caching strategies. Instead, modern FPGA accelerator cards
have a few tricks up their sleeve. We introduce a Top-K SpMV FPGA design that
leverages reduced precision and a novel packet-wise CSR matrix compression,
enabling custom data layouts and delivering bandwidth efficiency often
unreachable even in architectures with higher peak bandwidth. With HBM-based
boards, we are 100x faster than a multi-threaded CPU implementation and 2x
faster than a GPU with 20% higher bandwidth, with 14.2x higher
power-efficiency.
|
[{'version': 'v1', 'created': 'Mon, 8 Mar 2021 15:09:40 GMT'}]
|
2021-03-09
|
[array(['Parravicini', 'Alberto', ''], dtype=object)
array(['Cellamare', 'Luca Giuseppe', ''], dtype=object)
array(['Siracusa', 'Marco', ''], dtype=object)
array(['Santambrogio', 'Marco Domenico', ''], dtype=object)]
|
1,596 |
1209.1538
|
Thomas Guerin
|
Thomas Gu\'erin, Olivier B\'enichou and Rapha\"el Voituriez
|
Non-Markovian polymer reaction kinetics
|
Main text (7 pages, 5 figures) + Supplemantary Information (13 pages,
2 figures)
|
Nature Chemistry, 4, 568-573 (2012)
|
10.1038/NCHEM.1378
| null |
physics.chem-ph cond-mat.soft cond-mat.stat-mech physics.bio-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Describing the kinetics of polymer reactions, such as the formation of loops
and hairpins in nucleic acids or polypeptides, is complicated by the structural
dynamics of their chains. Although both intramolecular reactions, such as
cyclization, and intermolecular reactions have been studied extensively, both
experimentally and theoretically, there is to date no exact explicit analytical
treatment of transport-limited polymer reaction kinetics, even in the case of
the simplest (Rouse) model of monomers connected by linear springs. We
introduce a new analytical approach to calculate the mean reaction time of
polymer reactions that encompasses the non-Markovian dynamics of monomer
motion. This requires that the conformational statistics of the polymer at the
very instant of reaction be determined, which provides, as a by-product, new
information on the reaction path. We show that the typical reactive
conformation of the polymer is more extended than the equilibrium conformation,
which leads to reaction times significantly shorter than predicted by the
existing classical Markovian theory.
|
[{'version': 'v1', 'created': 'Fri, 7 Sep 2012 13:55:06 GMT'}]
|
2012-09-10
|
[array(['Guérin', 'Thomas', ''], dtype=object)
array(['Bénichou', 'Olivier', ''], dtype=object)
array(['Voituriez', 'Raphaël', ''], dtype=object)]
|
1,597 |
2305.19288
|
F\'elix Ch\'enier
|
F\'elix Ch\'enier, Etienne Marquis, Maude Fleury-Rousseau
|
Tracking the whole-body centre of mass while seated in a wheelchair
using motion capture
|
13 pages, 5 figures, 1 table
| null | null | null |
cs.HC physics.bio-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Estimating the position of the whole-body centre of mass (CoM) based on skin
markers and anthropometric tables requires tracking the pelvis and lower body,
which is impossible for wheelchair users due to occlusion. In this work, we
present a method to track the user's whole-body CoM using visible markers
affixed to the user and wheelchair where the user remains seated in their
wheelchair, by expressing the pelvis and lower body segments in wheelchair
coordinates. The accuracy of this method was evaluated on the
anterior-posterior (AP) and medial-lateral (ML) axes by comparing the projected
CoM to the centre of pressure measured by four force plates, for 11 able-bodied
participants adopting 9 static postures that include extreme reaching postures.
The estimation accuracy was within 33 mm (AP) and 9 mm (ML), with a precision
within 23 mm (AP) and 12 mm (ML). Tracking the whole-body CoM during wheelchair
propulsion will allow researchers to better understand the dynamics of
propulsion, which may help devise new approaches to increase the energy
transfer from the arms to the ground and reduce the risks of developing
musculoskeletal disorders.
|
[{'version': 'v1', 'created': 'Mon, 29 May 2023 15:52:09 GMT'}]
|
2023-06-01
|
[array(['Chénier', 'Félix', ''], dtype=object)
array(['Marquis', 'Etienne', ''], dtype=object)
array(['Fleury-Rousseau', 'Maude', ''], dtype=object)]
|
1,598 |
astro-ph/9812479
| null |
Leonid M. Ozernoy, Nikolai N. Gor'kavyi, Tatiana Taidakova
|
The Large Scale Structures in the Solar System: I. Cometary Belts With
Resonant Features Near the Orbits of Four Giant Planets
|
14 pages, 11 figures (figs. 9 to 11 are in color), LaTEX uses aasms4
| null | null |
GMU/CEOSR 98-12-1
|
astro-ph
| null |
We employ an efficient numerical approach to simulate a stationary
distribution of test objects, which results from their gravitational scattering
on the four giant planets, with accounting for effects of mean motion
resonances. Using the observed distribution of the Kuiper belt objects, we
reconstruct, in the space of orbital coordinates, the distribution function
$n(a,e,i)$ for the population of minor bodies beyond Jupiter. We confirm that
thousands of large yet cold comets and Centaurs might be located between the
orbits of Jupiter and Neptune. Moreover, we find as an important result that
they are concentrated into four circumsolar belts, with a highly non-uniform
and well structured distribution of the objects. This huge yet unrevealed
population, with only a few of its representatives presently known, is expected
to have, like our simulations demonstrate, a rich resonant structure containing
both density maxima and gaps. The resonant structure is formed due to
gravitational perturbations, i.e. in a non-dissipative way. If plotted in the
($a,e,i$)-space of orbital coordinates, the belts contain gaps (including those
between resonant groups), quite similar to the Kirkwood gaps in the main
asteroid belt. An appreciable fraction of the test bodies reveals, for some
time, an accumulation near (rather than in) the resonances, both interior and
exterior, with the giant planets. An accompanying paper considers the
population simulated in this work as the major source of dust in the outer
Solar system. The simple but fast and efficient numerical approach employed in
this work would allow the reader for applying it to many other problems of
his/her interest.
|
[{'version': 'v1', 'created': 'Wed, 30 Dec 1998 21:40:30 GMT'}]
|
2007-05-23
|
[array(['Ozernoy', 'Leonid M.', ''], dtype=object)
array(["Gor'kavyi", 'Nikolai N.', ''], dtype=object)
array(['Taidakova', 'Tatiana', ''], dtype=object)]
|
1,599 |
hep-ph/9303252
| null |
H. Lew
|
A Shadow Matter Universe
|
11 pages (LaTeX), PURD-TH-93-04
| null | null | null |
hep-ph
| null |
The cosmological and astrophysical implications of a shadow matter model
which could also have interesting experimental consequences are examined. The
model has identical microphysics for both the ordinary and shadow worlds but
requires a macroscopic asymmetry from nucleosynthesis constraints. It is
proposed that this macroscopic asymmetry can be generated at the quark-hadron
phase transition.
|
[{'version': 'v1', 'created': 'Fri, 12 Mar 1993 20:17:14 GMT'}]
|
2007-05-23
|
[array(['Lew', 'H.', ''], dtype=object)]
|
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