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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3,700 |
1312.2298
|
Shohei Hidaka
|
Shohei Hidaka, Neeraj Kashyap
|
On the Estimation of Pointwise Dimension
| null | null | null | null |
physics.data-an math.DS nlin.CD physics.comp-ph stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Our goal in this paper is to develop an effective estimator of fractal
dimension. We survey existing ideas in dimension estimation, with a focus on
the currently popular method of Grassberger and Procaccia for the estimation of
correlation dimension. There are two major difficulties in estimation based on
this method. The first is the insensitivity of correlation dimension itself to
differences in dimensionality over data, which we term "dimension blindness".
The second comes from the reliance of the method on the inference of limiting
behavior from finite data.
We propose pointwise dimension as an object for estimation in response to the
dimension blindness of correlation dimension. Pointwise dimension is a local
quantity, and the distribution of pointwise dimensions over the data contains
the information to which correlation dimension is blind. We use a "limit-free"
description of pointwise dimension to develop a new estimator. We conclude by
discussing potential applications of our estimator as well as some challenges
it raises.
|
[{'version': 'v1', 'created': 'Mon, 9 Dec 2013 03:09:25 GMT'}
{'version': 'v2', 'created': 'Wed, 11 Dec 2013 02:21:13 GMT'}
{'version': 'v3', 'created': 'Thu, 16 Jan 2014 04:04:13 GMT'}]
|
2014-01-17
|
[array(['Hidaka', 'Shohei', ''], dtype=object)
array(['Kashyap', 'Neeraj', ''], dtype=object)]
|
3,701 |
1803.09998
|
Stefano Pagliarani
|
Alberto Lanconelli, Stefano Pagliarani, and Andrea Pascucci
|
Local densities for a class of degenerate diffusions
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a class of R^d-valued continuous strong Markov processes that are
generated, only locally, by an ultra-parabolic operator with coefficients that
are regular w.r.t. the intrinsic geometry induced by the operator itself and
not w.r.t. the Euclidean one. The first main result is a local Ito formula for
functions that are not twice-differentiable in the classical sense, but only
intrinsically w.r.t. to a set of vector fields, related to the generator,
satisfying the Hormander condition. The second main contribution, which builds
upon the first one, is an existence and regularity result for the local
transition density.
|
[{'version': 'v1', 'created': 'Tue, 27 Mar 2018 10:16:34 GMT'}
{'version': 'v2', 'created': 'Fri, 4 May 2018 10:35:30 GMT'}
{'version': 'v3', 'created': 'Sun, 5 Aug 2018 08:15:40 GMT'}]
|
2018-08-07
|
[array(['Lanconelli', 'Alberto', ''], dtype=object)
array(['Pagliarani', 'Stefano', ''], dtype=object)
array(['Pascucci', 'Andrea', ''], dtype=object)]
|
3,702 |
1506.08328
|
Tan Le Thanh
|
Le Thanh Tan and Long Bao Le
|
Distributed MAC Protocol Design for Full-Duplex Cognitive Radio Networks
|
2015 IEEE Global Communications Conference (IEEE GLOBECOM 2015)
(accepted)
| null | null | null |
cs.IT cs.NI math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider the Medium Access Control (MAC) protocol design
for full-duplex cognitive radio networks (FDCRNs). Our design exploits the fact
that full-duplex (FD) secondary users (SUs) can perform spectrum sensing and
access simultaneously, which enable them to detect the primary users' (PUs)
activity during transmission. The developed FD MAC protocol employs the
standard backoff mechanism as in the 802.11 MAC protocol. However, we propose
to adopt the frame fragmentation during the data transmission phase for timely
detection of active PUs where each data packet is divided into multiple
fragments and the active SU makes sensing detection at the end of each data
fragment. Then, we develop a mathematical model to analyze the throughput
performance of the proposed FD MAC protocol. Furthermore, we propose an
algorithm to configure the MAC protocol so that efficient self-interference
management and sensing overhead control can be achieved. Finally, numerical
results are presented to evaluate the performance of our design and demonstrate
the throughput enhancement compared to the existing half-duplex (HD) cognitive
MAC protocol.
|
[{'version': 'v1', 'created': 'Sat, 27 Jun 2015 20:32:48 GMT'}]
|
2015-06-30
|
[array(['Tan', 'Le Thanh', ''], dtype=object)
array(['Le', 'Long Bao', ''], dtype=object)]
|
3,703 |
2004.08018
|
ALICE Publications
|
ALICE Collaboration
|
Search for a common baryon source in high-multiplicity pp collisions at
the LHC
|
23 pages, 5 captioned figures, 1 table, authors from page 18,
published version, figures at http://alice-publications.web.cern.ch/node/6194
|
Phys. Lett. B 811 (2020) 135849
|
10.1016/j.physletb.2020.135849
|
CERN-EP-2020-053
|
nucl-ex hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We report on the measurement of the size of the particle-emitting source from
two-baryon correlations with ALICE in high-multiplicity pp collisions at
$\sqrt{s}$ = 13 TeV. The source radius is studied with low relative momentum
p-p, $\bar{\rm{p}}$-$\bar{\rm{p}}$, p-$\Lambda$ and
$\bar{\rm{p}}$-$\bar{\Lambda}$ pairs as a function of the pair transverse mass
$m_{\rm{T}}$ considering for the first time in a quantitative way the effect of
strong resonance decays. After correcting for this effect, the radii extracted
for pairs of different particle species agree. This indicates that protons,
antiprotons, $\Lambda$, and $\bar{\Lambda}$ originate from the same source.
Within the measured $m_{\rm{T}}$ range (1.1-2.2) GeV/$c^{2}$ the invariant
radius of this common source varies between 0.85 and 1.3 fm. These results
provide a precise reference for studies of the strong hadron-hadron
interactions and for the investigation of collective properties in small
colliding systems.
|
[{'version': 'v1', 'created': 'Fri, 17 Apr 2020 01:32:52 GMT'}
{'version': 'v2', 'created': 'Thu, 25 Feb 2021 16:06:11 GMT'}]
|
2021-02-26
|
[array(['ALICE Collaboration', '', ''], dtype=object)]
|
3,704 |
1403.7365
|
Vania Estrela Dr.
|
Vania Vieira Estrela and Marcos Henrique da Silva Bassani
|
Expectation-Maximization Technique and Spatial-Adaptation Applied to
Pel-Recursive Motion Estimation
|
6 pages, pp. 204-209, Proceedings of the 8th World Multi-Conference
on Systemics, Cybernetics and Informatics, Volume XVI, Organized by the
International Institute of Informatics and Systemics, International
Federation of Systems Research: IFSR, Edited by Nagib Callaos, Maria Sanchez,
and Juan M. Pineda, TIB/UB Hannover, ISSN 12615810X, July 18-21, 2004,
Orlando, Florida, USA
|
ISSN 12615810X, 2004
| null | null |
cs.CV
|
http://creativecommons.org/licenses/publicdomain/
|
Pel-recursive motion estimation isa well-established approach. However, in
the presence of noise, it becomes an ill-posed problem that requires
regularization. In this paper, motion vectors are estimated in an iterative
fashion by means of the Expectation-Maximization (EM) algorithm and a Gaussian
data model. Our proposed algorithm also utilizes the local image properties of
the scene to improve the motion vector estimates following a spatially adaptive
approach. Numerical experiments are presented that demonstrate the merits of
our method.
|
[{'version': 'v1', 'created': 'Fri, 28 Mar 2014 12:47:16 GMT'}]
|
2014-03-31
|
[array(['Estrela', 'Vania Vieira', ''], dtype=object)
array(['Bassani', 'Marcos Henrique da Silva', ''], dtype=object)]
|
3,705 |
2007.05341
|
Hossein Khodabakhshi
|
H. Khodabakhshi, Robert B. Mann
|
Gravitational Lensing by Black Holes in Einstein Quartic Gravity
|
20 pages. arXiv admin note: substantial text overlap with
arXiv:1810.10657
|
Phys. Rev. D 103, 024017 (2021)
|
10.1103/PhysRevD.103.024017
| null |
gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate gravitational lensing effects of spherically symmetric black
holes in Einstein Quartic Gravity (EQG). Using an approximate analytic solution
obtained by continued fraction methods we consider the predictions of EQG for
lensing effects by supermassive black holes at the center of our galaxy and
others in comparison with general relativity (GR). We numerically compute both
time delays and angular positions of images and find that they can deviate from
GR by as much as milliarcseconds, suggesting that observational tests of EQG
are feasible in the near future. We discuss the challenges of distinguishing
the predictions of EQG from those of Einstein Cubic Gravity.
|
[{'version': 'v1', 'created': 'Wed, 8 Jul 2020 23:56:46 GMT'}]
|
2021-01-20
|
[array(['Khodabakhshi', 'H.', ''], dtype=object)
array(['Mann', 'Robert B.', ''], dtype=object)]
|
3,706 |
1711.02223
|
Xingye Da
|
Xingye Da and Jessy Grizzle
|
Combining Trajectory Optimization, Supervised Machine Learning, and
Model Structure for Mitigating the Curse of Dimensionality in the Control of
Bipedal Robots
|
Paper was submitted to International Journal of Robotics Research
(IJRR) in Nov. 2017
| null | null | null |
math.DS math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To overcome the obstructions imposed by high-dimensional bipedal models, we
embed a stable walking motion in an attractive low-dimensional surface of the
system's state space. The process begins with trajectory optimization to design
an open-loop periodic walking motion of the high-dimensional model and then
adding to this solution, a carefully selected set of additional open-loop
trajectories of the model that steer toward the nominal motion. A drawback of
trajectories is that they provide little information on how to respond to a
disturbance. To address this shortcoming, Supervised Machine Learning is used
to extract a low-dimensional state-variable realization of the open-loop
trajectories. The periodic orbit is now an attractor of the low-dimensional
state-variable model but is not attractive in the full-order system. We then
use the special structure of mechanical models associated with bipedal robots
to embed the low-dimensional model in the original model in such a manner that
the desired walking motions are locally exponentially stable. The design
procedure is first developed for ordinary differential equations and
illustrated on a simple model. The methods are subsequently extended to a class
of hybrid models and then realized experimentally on an Atrias-series 3D
bipedal robot.
|
[{'version': 'v1', 'created': 'Mon, 6 Nov 2017 23:45:28 GMT'}]
|
2017-11-08
|
[array(['Da', 'Xingye', ''], dtype=object)
array(['Grizzle', 'Jessy', ''], dtype=object)]
|
3,707 |
2305.15886
|
Ranajay Datta
|
Ranajay Datta, Fabian Berressem, Friederike Schmid, Arash Nikoubashman
and Peter Virnau
|
Viscosity of flexible and semiflexible ring melts -- molecular origins
and flow-induced segregation
| null | null | null | null |
cond-mat.soft cond-mat.stat-mech
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate with numerical simulations the molecular origin of viscosity
in melts of flexible and semiflexible oligomer rings in comparison to
corresponding systems with linear chains. The strong increase of viscosity with
ring stiffness is linked to the formation of entangled clusters, which dissolve
under shear. This shear-induced breakup and alignment of rings in the flow
direction lead to pronounced shear-thinning and non-Newtonian behavior. In
dispersions of linear chains, the viscosity can be associated with the
(average) number of entanglements between chains, which also dissolve under
shear. While blends of flexible and semiflexible rings are mixed at rest, the
two species separate under flow. This phenomenon has potential applications in
microfluidic devices to segregate ring polymers of similar mass and chemical
composition by their bending rigidity.
|
[{'version': 'v1', 'created': 'Thu, 25 May 2023 09:33:07 GMT'}]
|
2023-05-26
|
[array(['Datta', 'Ranajay', ''], dtype=object)
array(['Berressem', 'Fabian', ''], dtype=object)
array(['Schmid', 'Friederike', ''], dtype=object)
array(['Nikoubashman', 'Arash', ''], dtype=object)
array(['Virnau', 'Peter', ''], dtype=object)]
|
3,708 |
1507.01966
|
Francisco Vega Reyes
|
Mois\'es G. Chamorro, F. Vega Reyes, V. Garz\'o
|
Non-Newtonian hydrodynamics for a dilute granular suspension under
uniform shear flow
|
18 pages, 11 figures (v1); 16 pages and 9 figures (v2, important
revisions); to appear in Phys. Rev. E
|
Phys. Rev. E 92, 052205 (2015)
|
10.1103/PhysRevE.92.052205
| null |
cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study in this work a steady shearing laminar flow with null heat flux
(usually called "uniform shear flow") in a gas-solid suspension at low density.
The solid particles are modeled as a gas of smooth hard spheres with inelastic
collisions while the influence of the surrounding interstitial fluid on the
dynamics of grains is modeled by means of a volume drag force, in the context
of a rheological model for suspensions. The model is solved by means of three
different but complementary routes, two of them being theoretical (Grad's
moment method applied to the corresponding Boltzmann equation and an exact
solution of a kinetic model adapted to granular suspensions) and the other
being computational (Monte Carlo simulations of the Boltzmann equation). Unlike
in previous studies on granular sheared suspensions, we include in our Grad's
solution nonlinear terms in the stress tensor in the collisional moment
associated with the momentum transfer. This theoretical enhancement allows us
for the detection and evaluation of the normal stress differences in the plane
normal to the laminar flow. In addition, the exact solution of the kinetic
model gives the explicit form of the velocity moments of the velocity
distribution function. Comparison between our theoretical and numerical results
shows in general a good agreement for the non-Newtonian rheological properties,
the kurtosis (fourth velocity moment of the distribution function) and the
velocity distribution of the kinetic model for quite strong inelasticity and
not too large values of the (scaled) friction coefficient characterizing the
viscous drag force. This shows the accuracy of our analytical results that
allows us to describe in detail the flow dynamics of the granular suspension
with zero heat flux throughout the paper.
|
[{'version': 'v1', 'created': 'Tue, 7 Jul 2015 20:56:19 GMT'}
{'version': 'v2', 'created': 'Tue, 10 Nov 2015 11:21:53 GMT'}]
|
2015-12-03
|
[array(['Chamorro', 'Moisés G.', ''], dtype=object)
array(['Reyes', 'F. Vega', ''], dtype=object)
array(['Garzó', 'V.', ''], dtype=object)]
|
3,709 |
1610.03072
|
Nick Sterling
|
A. L. Mashburn (1), N. C. Sterling (1), S. Madonna (2), H. L.
Dinerstein (3), I. U. Roederer (4), and T. Geballe (5) ((1) University of
West Georgia, (2) IAC / Univerdidad de La Laguna, Spain, (3) University of
Texas at Austin, (4) University of Michigan, (5) Gemini Observatory)
|
Neutron-Capture Element Abundances in Magellanic Cloud Planetary Nebulae
|
16 pages, 1 figure, 4 tables, accepted for publication in ApJ Letters
| null |
10.3847/2041-8205/831/1/L3
| null |
astro-ph.SR astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present near-infrared spectra of ten planetary nebulae (PNe) in the Large
and Small Magellanic Clouds (LMC and SMC), acquired with the FIRE and GNIRS
spectrometers on the 6.5-m Baade and 8.1-m Gemini South Telescopes,
respectively. We detect Se and/or Kr emission lines in eight of these objects,
the first detections of n-capture elements in Magellanic Cloud PNe. Our
abundance analysis shows large s-process enrichments of Kr (0.6-1.3 dex) in the
six PNe in which it was detected, and Se is enriched by 0.5-0.9 dex in five
objects. We also estimate upper limits to Rb and Cd abundances in these
objects. Our abundance results for the LMC are consistent with the hypothesis
that PNe with 2--3 M$_{\odot}$ progenitors dominate the bright end of the PN
luminosity function in young gas-rich galaxies. We find no significant
correlations between s-process enrichments and other elemental abundances,
central star temperature, or progenitor mass, though this is likely due to our
small sample size. We determine S abundances from our spectra and find that
[S/H] agrees with [Ar/H] to within 0.2 dex for most objects, but is lower than
[O/H] by 0.2-0.4 dex in some PNe, possibly due to O enrichment via third
dredge-up. Our results demonstrate that n-capture elements can be detected in
PNe belonging to nearby galaxies with ground-based telescopes, allowing
s-process enrichments to be studied in PN populations with well-determined
distances.
|
[{'version': 'v1', 'created': 'Mon, 10 Oct 2016 20:00:07 GMT'}]
|
2016-11-15
|
[array(['Mashburn', 'A. L.', ''], dtype=object)
array(['Sterling', 'N. C.', ''], dtype=object)
array(['Madonna', 'S.', ''], dtype=object)
array(['Dinerstein', 'H. L.', ''], dtype=object)
array(['Roederer', 'I. U.', ''], dtype=object)
array(['Geballe', 'T.', ''], dtype=object)]
|
3,710 |
physics/0401159
|
Francois Rioual FR
|
F. Rioual, T. Biben and C. Misbah
|
An analytical analysis of vesicle tumbling under a shear flow
|
19 pages, 9 figures, to be published in Phys. Rev. E
| null |
10.1103/PhysRevE.69.061914
| null |
physics.bio-ph
| null |
Vesicles under a shear flow exhibit a tank-treading motion of their membrane,
while their long axis points with an angle < 45 degrees with respect to the
shear stress if the viscosity contrast between the interior and the exterior is
not large enough. Above a certain viscosity contrast, the vesicle undergoes a
tumbling bifurcation, a bifurcation which is known for red blood cells. We have
recently presented the full numerical analysis of this transition. In this
paper, we introduce an analytical model that has the advantage of being both
simple enough and capturing the essential features found numerically. The model
is based on general considerations and does not resort to the explicit
computation of the full hydrodynamic field inside and outside the vesicle.
|
[{'version': 'v1', 'created': 'Thu, 29 Jan 2004 14:03:35 GMT'}
{'version': 'v2', 'created': 'Mon, 2 Feb 2004 15:24:13 GMT'}]
|
2009-11-10
|
[array(['Rioual', 'F.', ''], dtype=object)
array(['Biben', 'T.', ''], dtype=object)
array(['Misbah', 'C.', ''], dtype=object)]
|
3,711 |
1907.00095
|
Meredith Rawls
|
Joni Marie Clark Cunningham, Meredith L. Rawls, Diana Windemuth,
Aleezah Ali, Jason Jackiewicz, Eric Agol, and Keivan G. Stassun
|
APOGEE/Kepler Overlap Yields Orbital Solutions for a Variety of
Eclipsing Binaries
|
25 pages, 23 figures, 4 tables, accepted for publication in AJ
| null |
10.3847/1538-3881/ab2d2b
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Spectroscopic Eclipsing Binaries (SEBs) are fundamental benchmarks in stellar
astrophysics and today are observed in breathtaking detail by missions like
TESS, Kepler, and APOGEE. We develop a methodology for simultaneous analysis of
high precision Kepler light curves and high resolution near-IR spectra from
APOGEE and present orbital solutions and evolutionary histories for a subset of
SEBs within this overlap. Radial velocities extracted from APOGEE spectra using
the Broadening Function technique are combined with Kepler light curves and to
yield binary orbital solutions. The Broadening Function approach yields more
precise radial velocities than the standard Cross-Correlation Function, which
in turn yields more precise orbital parameters and enables the identification
of tertiary stars. The orbital periods of these seven SEBs range from 4 to 40
days. Four of the systems (KIC 5285607, KIC 6864859, KIC 6778289, and KIC
4285087) are well-detached binaries. The remaining three systems have apparent
tertiary companions, but each exhibits two eclipses along with at least one
spectroscopically varying component (KIC 6449358, KIC 6131659, and KIC
6781535). Gaia distances are available for four targets which we use to
estimate temperatures of both members of these SEBs. We explore evolutionary
histories in H-R diagram space and estimate ages for this subset of our sample.
Finally, we consider the implications for the formation pathways of close
binary systems via interactions with tertiary companions. Our methodology
combined with the era of big data and observation overlap opens up the
possibility of discovering and analyzing large numbers of diverse SEBs,
including those with high flux ratios and those in triple systems.
|
[{'version': 'v1', 'created': 'Fri, 28 Jun 2019 22:10:59 GMT'}]
|
2019-08-21
|
[array(['Cunningham', 'Joni Marie Clark', ''], dtype=object)
array(['Rawls', 'Meredith L.', ''], dtype=object)
array(['Windemuth', 'Diana', ''], dtype=object)
array(['Ali', 'Aleezah', ''], dtype=object)
array(['Jackiewicz', 'Jason', ''], dtype=object)
array(['Agol', 'Eric', ''], dtype=object)
array(['Stassun', 'Keivan G.', ''], dtype=object)]
|
3,712 |
0709.3712
|
Diego Gotz
|
D. Gotz, N. Rea, G.L. Israel, S. Zane, P. Esposito, E.V. Gotthelf, S.
Mereghetti, A. Tiengo, R. Turolla
|
Long term hard X-ray variability of the anomalous X-ray pulsar 1RXS
J170849.0-400910 discovered with INTEGRAL
|
5 pages, 2 figures, accepted for publication in Astronomy &
Astrophysics main journal
| null |
10.1051/0004-6361:20078291
| null |
astro-ph
| null |
We report on a multi-band high-energy observing campaign aimed at studying
the long term spectral variability of the Anomalous X-ray Pulsar (AXP) 1RXS
J170849.0-400910, one of the magnetar candidates. We observed 1RXS
J170849.0-400910 in Fall 2006 and Spring 2007 simultaneously with Swift/XRT, in
the 0.1-10 keV energy range, and with INTEGRAL/IBIS, in the 20-200 keV energy
range. Furthermore, we also reanalyzed, using the latest calibration and
software, all the publicly available INTEGRAL data since 2002, and the soft
X-ray data starting from 1999 taken using BeppoSAX, Chandra, XMM, and
Swift/XRT, in order to study the soft and hard X-ray spectral variability of
1RXS J170849.0-400910. We find a long-term variability of the hard X-ray flux,
extending the hardness-intensity correlation proposed for this source over 2
orders of magnitude in energy.
|
[{'version': 'v1', 'created': 'Mon, 24 Sep 2007 09:01:19 GMT'}]
|
2009-11-13
|
[array(['Gotz', 'D.', ''], dtype=object)
array(['Rea', 'N.', ''], dtype=object)
array(['Israel', 'G. L.', ''], dtype=object)
array(['Zane', 'S.', ''], dtype=object)
array(['Esposito', 'P.', ''], dtype=object)
array(['Gotthelf', 'E. V.', ''], dtype=object)
array(['Mereghetti', 'S.', ''], dtype=object)
array(['Tiengo', 'A.', ''], dtype=object)
array(['Turolla', 'R.', ''], dtype=object)]
|
3,713 |
1310.6429
|
Burkhard C. Schipper
|
Jerome Lang, Bruno Zanuttini
|
Knowledge-Based Programs as Plans: Succinctness and the Complexity of
Plan Existence
|
10 pages, Contributed talk at TARK 2013 (arXiv:1310.6382)
http://www.tark.org
| null | null |
TARK/2013/p138
|
cs.AI cs.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Knowledge-based programs (KBPs) are high-level protocols describing the
course of action an agent should perform as a function of its knowledge. The
use of KBPs for expressing action policies in AI planning has been surprisingly
overlooked. Given that to each KBP corresponds an equivalent plan and vice
versa, KBPs are typically more succinct than standard plans, but imply more
on-line computation time. Here we make this argument formal, and prove that
there exists an exponential succinctness gap between knowledge-based programs
and standard plans. Then we address the complexity of plan existence. Some
results trivially follow from results already known from the literature on
planning under incomplete knowledge, but many were unknown so far.
|
[{'version': 'v1', 'created': 'Wed, 23 Oct 2013 23:25:44 GMT'}]
|
2013-10-29
|
[array(['Lang', 'Jerome', ''], dtype=object)
array(['Zanuttini', 'Bruno', ''], dtype=object)]
|
3,714 |
2009.05379
|
Md. Kamrul Hasan Dr.
|
Abdul Muntakim Rafi, Jonathan Wu, Md. Kamrul Hasan
|
L2-Constrained RemNet for Camera Model Identification and Image
Manipulation Detection
|
arXiv admin note: text overlap with arXiv:1902.00694
| null | null | null |
eess.IV eess.SP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Source camera model identification (CMI) and image manipulation detection are
of paramount importance in image forensics. In this paper, we propose an
L2-constrained Remnant Convolutional Neural Network (L2-constrained RemNet) for
performing these two crucial tasks. The proposed network architecture consists
of a dynamic preprocessor block and a classification block. An L2 loss is
applied to the output of the preprocessor block, and categorical crossentropy
loss is calculated based on the output of the classification block. The whole
network is trained in an end-to-end manner by minimizing the total loss, which
is a combination of the L2 loss and the categorical crossentropy loss. Aided by
the L2 loss, the data-adaptive preprocessor learns to suppress the unnecessary
image contents and assists the classification block in extracting robust image
forensics features. We train and test the network on the Dresden database and
achieve an overall accuracy of 98.15%, where all the test images are from
devices and scenes not used during training to replicate practical
applications. The network also outperforms other state-of-the-art CNNs even
when the images are manipulated. Furthermore, we attain an overall accuracy of
99.68% in image manipulation detection, which implies that it can be used as a
general-purpose network for image forensic tasks.
|
[{'version': 'v1', 'created': 'Thu, 10 Sep 2020 17:04:50 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Sep 2020 16:15:34 GMT'}]
|
2020-09-15
|
[array(['Rafi', 'Abdul Muntakim', ''], dtype=object)
array(['Wu', 'Jonathan', ''], dtype=object)
array(['Hasan', 'Md. Kamrul', ''], dtype=object)]
|
3,715 |
1910.12141
|
Yuhua Zhu
|
Shi Jin, Yuhua Zhu, Enrique Zuazua
|
The Vlasov-Fokker-Planck Equation with High Dimensional Parametric
Forcing Term
| null | null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the Vlasov-Fokker-Planck equation with random electric field
where the random field is parametrized by countably many infinite random
variables due to uncertainty. At the theoretical level, with suitable
assumption on the anisotropy of the randomness, adopting the technique employed
in elliptic PDEs [Cohen, DeVore, 2015], we prove the best N approximation in
the random space breaks the dimension curse and the convergence rate is faster
than the Monte Carlo method. For the numerical method, based on the adaptive
sparse polynomial interpolation (ASPI) method introduced in [Chkifa, Cohen,
Schwab, 2014], we develop a residual-based adaptive sparse polynomial
interpolation (RASPI) method which is more efficient for multi-scale linear
kinetic equation, when using numerical schemes that are time-dependent and
implicit. Numerical experiments show that the numerical error of the RASPI
decays faster than the Monte-Carlo method and is also dimension independent.
|
[{'version': 'v1', 'created': 'Sat, 26 Oct 2019 20:48:38 GMT'}]
|
2019-10-29
|
[array(['Jin', 'Shi', ''], dtype=object)
array(['Zhu', 'Yuhua', ''], dtype=object)
array(['Zuazua', 'Enrique', ''], dtype=object)]
|
3,716 |
2201.00570
|
Adrian Redder
|
Adrian Redder, Arunselvan Ramaswamy, Holger Karl
|
3DPG: Distributed Deep Deterministic Policy Gradient Algorithms for
Networked Multi-Agent Systems
| null | null | null | null |
cs.LG cs.AI cs.MA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present Distributed Deep Deterministic Policy Gradient (3DPG), a
multi-agent actor-critic (MAAC) algorithm for Markov games. Unlike previous
MAAC algorithms, 3DPG is fully distributed during both training and deployment.
3DPG agents calculate local policy gradients based on the most recently
available local data (states, actions) and local policies of other agents.
During training, this information is exchanged using a potentially lossy and
delaying communication network. The network therefore induces Age of
Information (AoI) for data and policies. We prove the asymptotic convergence of
3DPG even in the presence of potentially unbounded Age of Information (AoI).
This provides an important step towards practical online and distributed
multi-agent learning since 3DPG does not assume information to be available
deterministically. We analyze 3DPG in the presence of policy and data transfer
under mild practical assumptions. Our analysis shows that 3DPG agents converge
to a local Nash equilibrium of Markov games in terms of utility functions
expressed as the expected value of the agents local approximate action-value
functions (Q-functions). The expectations of the local Q-functions are with
respect to limiting distributions over the global state-action space shaped by
the agents' accumulated local experiences. Our results also shed light on the
policies obtained by general MAAC algorithms. We show through a heuristic
argument and numerical experiments that 3DPG improves convergence over previous
MAAC algorithms that use old actions instead of old policies during training.
Further, we show that 3DPG is robust to AoI; it learns competitive policies
even with large AoI and low data availability.
|
[{'version': 'v1', 'created': 'Mon, 3 Jan 2022 10:33:52 GMT'}
{'version': 'v2', 'created': 'Wed, 2 Nov 2022 15:14:00 GMT'}]
|
2022-11-03
|
[array(['Redder', 'Adrian', ''], dtype=object)
array(['Ramaswamy', 'Arunselvan', ''], dtype=object)
array(['Karl', 'Holger', ''], dtype=object)]
|
3,717 |
2303.02535
|
Akanksha Saran
|
Akanksha Saran, Safoora Yousefi, Akshay Krishnamurthy, John Langford,
Jordan T. Ash
|
Streaming Active Learning with Deep Neural Networks
|
ICML 2023
| null | null | null |
cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
Active learning is perhaps most naturally posed as an online learning
problem. However, prior active learning approaches with deep neural networks
assume offline access to the entire dataset ahead of time. This paper proposes
VeSSAL, a new algorithm for batch active learning with deep neural networks in
streaming settings, which samples groups of points to query for labels at the
moment they are encountered. Our approach trades off between uncertainty and
diversity of queried samples to match a desired query rate without requiring
any hand-tuned hyperparameters. Altogether, we expand the applicability of deep
neural networks to realistic active learning scenarios, such as applications
relevant to HCI and large, fractured datasets.
|
[{'version': 'v1', 'created': 'Sun, 5 Mar 2023 00:57:28 GMT'}
{'version': 'v2', 'created': 'Tue, 6 Jun 2023 23:34:01 GMT'}]
|
2023-06-08
|
[array(['Saran', 'Akanksha', ''], dtype=object)
array(['Yousefi', 'Safoora', ''], dtype=object)
array(['Krishnamurthy', 'Akshay', ''], dtype=object)
array(['Langford', 'John', ''], dtype=object)
array(['Ash', 'Jordan T.', ''], dtype=object)]
|
3,718 |
hep-th/9805179
|
Alexei Semikhatov
|
B L Feigin, A M Semikhatov, V A Sirota, and I Yu Tipunin
|
Resolutions and Characters of Irreducible Representations of the N=2
Superconformal Algebra
|
LaTeX2e: amsart, 34pp. An overall sign error corrected in (4.33) and
several consequent formulas, and the presentation streamlined in Sec.4.2.3.
References added. To appear in Nucl. Phys. B
|
Nucl.Phys. B536 (1998) 617-656
|
10.1016/S0550-3213(98)00615-4
| null |
hep-th math-ph math.MP math.RT
| null |
We evaluate characters of irreducible representations of the N=2
supersymmetric extension of the Virasoro algebra. We do so by deriving the
BGG-resolution of the admissible N=2 representations and also a new
3,5,7...-resolution in terms of twisted massive Verma modules. We analyse how
the characters behave under the automorphisms of the algebra, whose most
significant part is the spectral flow transformations. The possibility to
express the characters in terms of theta functions is determined by their
behaviour under the spectral flow. We also derive the identity expressing every
$\hat{sl}(2)$ character as a linear combination of spectral-flow transformed
N=2 characters; this identity involves a finite number of N=2 characters in the
case of unitary representations. Conversely, we find an integral representation
for the admissible N=2 characters as contour integrals of admissible
$\hat{sl}(2)$ characters.
|
[{'version': 'v1', 'created': 'Tue, 26 May 1998 23:53:48 GMT'}
{'version': 'v2', 'created': 'Mon, 1 Jun 1998 20:29:48 GMT'}
{'version': 'v3', 'created': 'Sat, 29 Aug 1998 14:09:18 GMT'}]
|
2009-10-31
|
[array(['Feigin', 'B L', ''], dtype=object)
array(['Semikhatov', 'A M', ''], dtype=object)
array(['Sirota', 'V A', ''], dtype=object)
array(['Tipunin', 'I Yu', ''], dtype=object)]
|
3,719 |
2106.02410
|
Marco Barsanti
|
Marco Barsanti, Gianni Tallarita
|
Baby-Skyrmions dressed by fermions, an analytic sector
| null | null | null | null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We find an analytic solution of the backreacted coupled fermion-baby-Skyrmion
system valid at all values of the coupling parameter. The solution, built on a
finite cylinder, is generally given in terms of the Heun functions and
satisfies the physical requirements of finite energy. For a special value of
the coupling parameter, the solution becomes a periodic crystal of
baby-Skyrmions and fermions defined on the plane $\mathbb{R}^2$. These
solutions are trivially extended to multi-solitonic branches of higher Baryon
number.
|
[{'version': 'v1', 'created': 'Fri, 4 Jun 2021 10:52:52 GMT'}]
|
2021-06-07
|
[array(['Barsanti', 'Marco', ''], dtype=object)
array(['Tallarita', 'Gianni', ''], dtype=object)]
|
3,720 |
2011.04258
|
Bastien Vanderplaetse
|
Bastien Vanderplaetse, St\'ephane Dupont
|
Improved Soccer Action Spotting using both Audio and Video Streams
|
Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern
Recognition (CVPR) Workshops, 2020, pp. 896-897
| null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we propose a study on multi-modal (audio and video) action
spotting and classification in soccer videos. Action spotting and
classification are the tasks that consist in finding the temporal anchors of
events in a video and determine which event they are. This is an important
application of general activity understanding. Here, we propose an experimental
study on combining audio and video information at different stages of deep
neural network architectures. We used the SoccerNet benchmark dataset, which
contains annotated events for 500 soccer game videos from the Big Five European
leagues. Through this work, we evaluated several ways to integrate audio stream
into video-only-based architectures. We observed an average absolute
improvement of the mean Average Precision (mAP) metric of $7.43\%$ for the
action classification task and of $4.19\%$ for the action spotting task.
|
[{'version': 'v1', 'created': 'Mon, 9 Nov 2020 09:12:44 GMT'}]
|
2020-11-10
|
[array(['Vanderplaetse', 'Bastien', ''], dtype=object)
array(['Dupont', 'Stéphane', ''], dtype=object)]
|
3,721 |
0807.2507
|
Juan A. Valiente-Kroon
|
JA Valiente Kroon
|
Regularity conditions at spatial infinity revisited
|
41 pages
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The regular finite initial value problem at infinity is used to obtain
regularity conditions on the freely specifiable parts of initial data for the
vacuum Einstein equations with non-vanishing second fundamental form. These
conditions ensure that the solutions of the propagation equations implied by
the conformal Einstein equations at the cylinder at spatial infinity extend
smoothly (and in fact analytically) through the critical sets where spatial
infinity touches null infinity. In order to ease the analysis the conformal
metric is assumed to be analytic, although the results presented here could be
generalised to a setting where the conformal metric is only smooth. The
analysis given here is a generalisation of the analysis on the regular finite
initial value problem first carried out by Friedrich, for initial data sets
with non-vanishing second fundamental form.
|
[{'version': 'v1', 'created': 'Wed, 16 Jul 2008 07:29:36 GMT'}]
|
2008-07-17
|
[array(['Kroon', 'JA Valiente', ''], dtype=object)]
|
3,722 |
0909.3368
|
Zach Cano
|
Zachariah Cano, Robert Connon Smith
|
Does the RR Lyrae variable DY And show the Blazhko effect?
|
7 pages, 2 tables & 4 images. Accepted for publication in The
Observatory, February 2010
|
The Observatory, Vol 130, No 1214, 11- 16, Feb 2010
| null | null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Data taken on the University of Sussex 0.46-m telescope in 2006 and 2007 are
combined with previously published data to obtain a better defined light curve
for the RRab-type variable DY And, a slightly improved period of 0.6030897
+0.0000006 -0.0000002 days and a new time of maximum. Evidence is presented
that may indicate the Blazhko effect in this system. In addition, a new time of
maximum has been obtained for VX Tri.
|
[{'version': 'v1', 'created': 'Fri, 18 Sep 2009 07:27:51 GMT'}]
|
2010-01-25
|
[array(['Cano', 'Zachariah', ''], dtype=object)
array(['Smith', 'Robert Connon', ''], dtype=object)]
|
3,723 |
1409.7350
|
Igor Protasov
|
Igor Protasov, Sergii Slobodianiuk
|
On the subset Combinatorics of G-spaces
| null | null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $G$ be a group and let $X$ be a transitive $G$-space. We classify the
subsets of $X$ with respect to a translation invariant ideal $\mathcal{J}$ in
the Boolean algebra of all subsets of $X$, introduce and apply the relative
combinatorical derivations of subsets of $X$. Using the standard action of $G$
on the Stone-$\check{C}$ech compactification $\beta X$ of the discrete space
$X$, we characterize the points $p\in\beta X$ isolated in $Gp$ and describe a
size of a subset of $X$ in terms of its ultracompanions in $\beta X$. We
introduce and characterize scattered and sparse subsets of $X$ from different
points of view.
|
[{'version': 'v1', 'created': 'Thu, 25 Sep 2014 17:58:46 GMT'}]
|
2014-09-26
|
[array(['Protasov', 'Igor', ''], dtype=object)
array(['Slobodianiuk', 'Sergii', ''], dtype=object)]
|
3,724 |
quant-ph/0107084
|
William D. Oliver
|
William D. Oliver, F. Yamaguchi and Y. Yamamoto
|
Electron Entanglement via a Quantum Dot
|
4 pages
|
PHYS REV LETT 88 (3): Art. No. 037901 JAN 21 2002
|
10.1103/PhysRevLett.88.037901
| null |
quant-ph cond-mat.mes-hall
| null |
This Letter presents a method of electron entanglement generation. The system
under consideration is a single-level quantum dot with one input and two output
leads. The leads are arranged such that the dot is empty, single electron
tunneling is suppressed by energy conservation, and two-electron virtual
co-tunneling is allowed. This yields a pure, non-local spin-singlet state at
the output leads. Coulomb interaction is the nonlinearity essential for
entanglement generation, and, in its absence, the singlet state vanishes. This
type of electron entanglement is a four-wave mixing process analogous to the
photon entanglement generated by a Chi-3 parametric amplifier.
|
[{'version': 'v1', 'created': 'Mon, 16 Jul 2001 23:49:27 GMT'}]
|
2009-11-07
|
[array(['Oliver', 'William D.', ''], dtype=object)
array(['Yamaguchi', 'F.', ''], dtype=object)
array(['Yamamoto', 'Y.', ''], dtype=object)]
|
3,725 |
1909.13867
|
Joseph Lee
|
Joseph K. L. Lee, Luigi Del Debbio, Andreas J\"uttner, Antonin
Portelli, Kostas Skenderis
|
Towards a holographic description of cosmology: Renormalisation of the
energy-momentum tensor of the dual QFT
|
7 pages, 2 figures, presented at the 37th International Symposium on
Lattice Field Theory - LATTICE2019 - 16-22 June, 2019, Wuhan, China
| null | null | null |
hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the holographic approach to cosmology, cosmological observables are
described in terms of correlators of a three-dimensional boundary quantum field
theory. As a concrete model, we study the 3$d$ massless $SU(N)$ scalar matrix
field theory. In this work, we focus on the renormalisation of the
energy-momentum tensor 2-point function, which can be related to the CMB power
spectra. Here we present a non-perturbative procedure to remove divergences
resulting from the loss of translational invariance on the lattice, by imposing
Ward identities. This will allow us to make predictions for the CMB power
spectra in the regime where the dual QFT is non-perturbative.
|
[{'version': 'v1', 'created': 'Mon, 30 Sep 2019 17:49:58 GMT'}]
|
2019-10-01
|
[array(['Lee', 'Joseph K. L.', ''], dtype=object)
array(['Del Debbio', 'Luigi', ''], dtype=object)
array(['Jüttner', 'Andreas', ''], dtype=object)
array(['Portelli', 'Antonin', ''], dtype=object)
array(['Skenderis', 'Kostas', ''], dtype=object)]
|
3,726 |
hep-ph/9503323
| null |
B. Ananthanarayan and P. N. Pandita
|
The Non-Minimal Supersymmetric Standard Model with $\tan\beta\simeq
m_t/m_b$
|
22 pages plain LaTeX including 1 Table and 1 Figure
|
Phys.Lett.B353:70-78,1995
|
10.1016/0370-2693(95)00517-O
|
UNIL-TP-1/95, NORDITA - 95/20 P
|
hep-ph
| null |
We consider the supersymmetric extension of the standard model with an
additional singlet $S$, the Non-Minimal Supersymmetric Standard Model (NMSSM),
in the limit $\tan\beta \simeq m_t/m_b$. We embed this model in a supergravity
framework with universal boundary conditions and analyze the renormalization
group improved tree-level potential. We examine the relationship between this
model and the minimial supersymmetric standard model (MSSM), and discuss the
novel connections between the two when $\tan\beta$ is large. Strong
correlations between the free parameters of the nonminimal model are found and
the reasons for these discussed. The singlet vacuum expectation value is forced
to be large, of the order of $10 TeV$. The radiatively corrected mass of the
lightest Higgs boson is found to be $\stackrel{_<}{_\sim} 140 GeV$.
|
[{'version': 'v1', 'created': 'Tue, 14 Mar 1995 14:31:18 GMT'}]
|
2008-12-22
|
[array(['Ananthanarayan', 'B.', ''], dtype=object)
array(['Pandita', 'P. N.', ''], dtype=object)]
|
3,727 |
1703.00556
|
Risto Miikkulainen
|
Risto Miikkulainen, Neil Iscoe, Aaron Shagrin, Ron Cordell, Sam
Nazari, Cory Schoolland, Myles Brundage, Jonathan Epstein, Randy Dean,
Gurmeet Lamba
|
Conversion Rate Optimization through Evolutionary Computation
| null | null | null | null |
cs.HC cs.AI cs.NE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Conversion optimization means designing a web interface so that as many users
as possible take a desired action on it, such as register or purchase. Such
design is usually done by hand, testing one change at a time through A/B
testing, or a limited number of combinations through multivariate testing,
making it possible to evaluate only a small fraction of designs in a vast
design space. This paper describes Sentient Ascend, an automatic conversion
optimization system that uses evolutionary optimization to create effective web
interface designs. Ascend makes it possible to discover and utilize
interactions between the design elements that are difficult to identify
otherwise. Moreover, evaluation of design candidates is done in parallel
online, i.e. with a large number of real users interacting with the system. A
case study on an existing media site shows that significant improvements (i.e.
over 43%) are possible beyond human design. Ascend can therefore be seen as an
approach to massively multivariate conversion optimization, based on a
massively parallel interactive evolution.
|
[{'version': 'v1', 'created': 'Wed, 1 Mar 2017 23:54:28 GMT'}
{'version': 'v2', 'created': 'Fri, 3 Mar 2017 21:16:02 GMT'}
{'version': 'v3', 'created': 'Mon, 27 Mar 2017 18:30:16 GMT'}
{'version': 'v4', 'created': 'Sun, 30 Apr 2017 20:51:21 GMT'}]
|
2017-05-02
|
[array(['Miikkulainen', 'Risto', ''], dtype=object)
array(['Iscoe', 'Neil', ''], dtype=object)
array(['Shagrin', 'Aaron', ''], dtype=object)
array(['Cordell', 'Ron', ''], dtype=object)
array(['Nazari', 'Sam', ''], dtype=object)
array(['Schoolland', 'Cory', ''], dtype=object)
array(['Brundage', 'Myles', ''], dtype=object)
array(['Epstein', 'Jonathan', ''], dtype=object)
array(['Dean', 'Randy', ''], dtype=object)
array(['Lamba', 'Gurmeet', ''], dtype=object)]
|
3,728 |
1605.03155
|
Adam Oberman
|
Adam M. Oberman, Yuanlong Ruan
|
A partial differential equation for the rank one convex envelope
|
26 pages, 5 figures, 4 tables
| null |
10.1007/s00205-017-1092-5
| null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article we introduce a Partial Differential Equation (PDE) for the
rank one convex envelope. Rank one convex envelopes arise in non-convex vector
valued variational problems \cite{BallElasticity, kohn1986optimal1,
BallJames87, chipot1988equilibrium}. More generally, we study a PDE for
directional convex envelopes, which includes the usual convex envelope
\cite{ObermanConvexEnvelope} and the rank one convex envelope as special cases.
Existence and uniqueness of viscosity solutions to the PDE is established. Wide
stencil elliptic finite difference schemes are built. Convergence of finite
difference solutions to the viscosity solution of the PDE is proven. Numerical
examples of rank one and other directional convex envelopes are presented.
Additionally, laminates are computed from the rank one convex envelope.
|
[{'version': 'v1', 'created': 'Tue, 10 May 2016 19:08:20 GMT'}
{'version': 'v2', 'created': 'Wed, 11 May 2016 00:54:22 GMT'}
{'version': 'v3', 'created': 'Thu, 12 Jan 2017 21:58:54 GMT'}]
|
2017-03-08
|
[array(['Oberman', 'Adam M.', ''], dtype=object)
array(['Ruan', 'Yuanlong', ''], dtype=object)]
|
3,729 |
1602.05451
|
Tao Li
|
Yunlong Xiao, Tao Li, Shao-Ming Fei, Naihuan Jing, Xianqing Li-Jost
and Zhi-Xi Wang
|
Geometric Global Quantum Discord of Two-qubit States
| null |
Chin. Phys. B Vol. 25, No. 3 (2016) 030301
|
10.1088/1674-1056/25/3/030301
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the geometric global quantum discord (GGQD) of two-qubit systems.
By analyzing the symmetry of geometric global quantum discord we give an
approach for deriving analytical formulae of the extremum problem which lies at
the core of computing the GGQD for arbitrary two-qubit states. Furthermore,
formulae of GGQD of arbitrary two-qubit states and some concrete examples are
presented.
|
[{'version': 'v1', 'created': 'Wed, 17 Feb 2016 15:22:29 GMT'}]
|
2016-02-18
|
[array(['Xiao', 'Yunlong', ''], dtype=object)
array(['Li', 'Tao', ''], dtype=object)
array(['Fei', 'Shao-Ming', ''], dtype=object)
array(['Jing', 'Naihuan', ''], dtype=object)
array(['Li-Jost', 'Xianqing', ''], dtype=object)
array(['Wang', 'Zhi-Xi', ''], dtype=object)]
|
3,730 |
2107.03960
|
Md Nasimul Islam Maruf
|
Md. Nasimul Islam Maruf, German Morales-Espana, Jos Sijm, Niina
Helisto, Juha Kiviluoma
|
Classification, potential role, and modeling of power-to-heat and
thermal energy storage in energy systems: A review
| null |
Sustainable Energy Technologies and Assessments, Volume 53, Part
B, October 2022, 102553
|
10.1016/j.seta.2022.102553
| null |
physics.soc-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Most of the power-to-heat and thermal energy storage technologies are mature
and impact the European energy transition. However, detailed models of these
technologies are usually very complex, making it challenging to implement them
in large-scale energy models, where simplicity, e.g., linearity and appropriate
accuracy, are desirable due to computational limitations. In the literature,
the main power-to-heat and thermal energy storage technologies across all
sectors have not been clearly identified and characterized. Their potential
roles have not been fully discussed from the European perspective, and their
mathematical modeling equations have not been presented in a compiled form.
This paper contributes to the research gap in three main parts. First, it
identifies and classifies the major power-to-heat and thermal energy storage
technologies that are climate-neutral, efficient, and technologically matured
to supplement or substitute the current fossil fuel-based heating. The second
part presents the technology readiness levels of the identified technologies
and discusses their potential role in a sustainable European energy system. The
third part presents the mathematical modeling equations for the technologies in
large-scale optimization energy models. We identified electric heat pumps,
electric boilers, electric resistance heaters, and hybrid heating systems as
the most promising power-to-heat options. We grouped the most promising thermal
energy storage technologies under four major categories. Low-temperature
electric heat pumps, electric boilers, electric resistance heaters, and
sensible and latent heat storage show high technology readiness levels to
facilitate a large share of the heat demand. Finally, the mathematical
formulations capture the main effects of the identified technologies.
|
[{'version': 'v1', 'created': 'Thu, 8 Jul 2021 16:35:37 GMT'}
{'version': 'v2', 'created': 'Fri, 5 Aug 2022 07:30:09 GMT'}]
|
2022-08-08
|
[array(['Maruf', 'Md. Nasimul Islam', ''], dtype=object)
array(['Morales-Espana', 'German', ''], dtype=object)
array(['Sijm', 'Jos', ''], dtype=object)
array(['Helisto', 'Niina', ''], dtype=object)
array(['Kiviluoma', 'Juha', ''], dtype=object)]
|
3,731 |
2210.12413
|
Ksenia Suchomska Ms
|
K. Suchomska, D. Graczyk, C. Ga{\l}an, O. Zi\'o{\l}kowska, R. Smolec,
G. Pietrzy\'nski, W. Gieren, S. Villanova, M. G\'orski, I. B. Thompson, P.
Wielg\'orski, B. Zgirski, P. Karczmarek, B. Pilecki, M. Taormina, W. Narloch,
G. Hajdu, M. Lewis, M. Ka{\l}uszy\'nski, and G. Rojas Garc\'ia
|
Evolved eclipsing binary systems in the Galactic bulge: Precise physical
and orbital parameters of OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218
|
12 pages, 5 figures, accepted in A&A
|
A&A 668, A30 (2022)
|
10.1051/0004-6361/202244433
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Our goal is to determine, with high accuracy, the physical and orbital
parameters of two double-lined eclipsing binary systems, where the components
are two giant stars. We also aim to study the evolutionary status of the
binaries, to derive the distances towards them by using a surface
brightness-colour relation, and to compare these measurements with the
measurements presented by the Gaia mission. In order to measure the physical
and orbital parameters of the systems, we analysed the light curves and
radial-velocity curves with the Wilson-Devinney code. We used V band and I-band
photometry from the OGLE catalogue and near-infrared photometry obtained with
the New Technology Telescope (NTT) equipped with the SOFI instrument. The
spectroscopic data were collected with the HARPS spectrograph mounted at the
ESO 3.6m telescope and the MIKE spectrograph mounted at the 6.5m Clay
telescope. We present the first analysis of this kind for two evolved eclipsing
binary systems from the OGLE catalogue: OGLE-BLG-ECL-305487 and
OGLE-BLG-ECL-116218. The masses of the components of OGLE-BLG-ECL-305487 are
$M_1$ = 1.059 $\pm$ 0.019 and $M_2$ = 0.991 $\pm$ 0.018 $M_\odot$, and the
radii are $R_1$ = 19.27 $\pm$ 0.28 and $R_2$ = 29.99 $\pm$ 0.24 R$_\odot$. For
OGLE-BLG-ECL-116218, the masses are $M_1$= 0.969 $\pm$ 0.012 and $M_2$= 0.983
$\pm$ 0.012 $M_\odot$, while the radii are $R_1$= 16.73 $\pm$ 0.28 and $R_2$=
22.06 $\pm$ 0.26 $R_\odot$. The evolutionary status of the systems is discussed
based on the PARSEC and MIST isochrones. The ages of the systems were
established to be between 7.3-10.9 Gyr for OGLE-BLG-ECL-305487 and around 10
Gyr for OGLE-BLG-ECL-116218. We also measured the distances to the binaries.
For OGLE-BLG-ECL-305487, $d$= 7.80 $\pm$ 0.18 (stat.) $\pm$ 0.19 (syst.) kpc
and for OGLE-BLG-ECL-116218, $d$= 7.57 $\pm$ 0.28 (stat.) $\pm$ 0.19 (syst.)
kpc.
|
[{'version': 'v1', 'created': 'Sat, 22 Oct 2022 10:44:58 GMT'}
{'version': 'v2', 'created': 'Sat, 29 Oct 2022 09:40:09 GMT'}]
|
2022-11-30
|
[array(['Suchomska', 'K.', ''], dtype=object)
array(['Graczyk', 'D.', ''], dtype=object)
array(['Gałan', 'C.', ''], dtype=object)
array(['Ziółkowska', 'O.', ''], dtype=object)
array(['Smolec', 'R.', ''], dtype=object)
array(['Pietrzyński', 'G.', ''], dtype=object)
array(['Gieren', 'W.', ''], dtype=object)
array(['Villanova', 'S.', ''], dtype=object)
array(['Górski', 'M.', ''], dtype=object)
array(['Thompson', 'I. B.', ''], dtype=object)
array(['Wielgórski', 'P.', ''], dtype=object)
array(['Zgirski', 'B.', ''], dtype=object)
array(['Karczmarek', 'P.', ''], dtype=object)
array(['Pilecki', 'B.', ''], dtype=object)
array(['Taormina', 'M.', ''], dtype=object)
array(['Narloch', 'W.', ''], dtype=object)
array(['Hajdu', 'G.', ''], dtype=object)
array(['Lewis', 'M.', ''], dtype=object)
array(['Kałuszyński', 'M.', ''], dtype=object)
array(['García', 'G. Rojas', ''], dtype=object)]
|
3,732 |
2103.01881
|
Lauren Rhodes
|
Lauren Rhodes, Rob Fender, David R.A. Williams and Kunal Mooley
|
An early peak in the radio light curve of short-duration Gamma-Ray Burst
200826A
|
7 pages, 3 figures, accepted to MNRAS
| null |
10.1093/mnras/stab640
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the results of radio observations from the eMERLIN telescope
combined with X-ray data from Swift for the short-duration Gamma-ray burst
(GRB) 200826A, located at a redshift of 0.71. The radio light curve shows
evidence of a sharp rise, a peak around 4-5 days post-burst, followed by a
relatively steep decline. We provide two possible interpretations based on the
time at which the light curve reached its peak. (1) If the light curve peaks
earlier, the peak is produced by the synchrotron self-absorption frequency
moving through the radio band, resulting from the forward shock propagating
into a wind medium and (2) if the light curve peaks later, the turn over in the
light curve is caused by a jet break. In the former case, we find a minimum
equipartition energy of ~3x10^47 erg and bulk Lorentz factor of ~5, while in
the latter case we estimate the jet opening angle of ~9-16 degrees. Due to the
lack of data, it is impossible to determine which is the correct
interpretation, however, due to its relative simplicity and consistency with
other multi-wavelength observations which hint at the possibility that GRB
200826A is in fact a long GRB, we prefer scenario one over scenario two.
|
[{'version': 'v1', 'created': 'Tue, 2 Mar 2021 17:26:51 GMT'}]
|
2021-03-17
|
[array(['Rhodes', 'Lauren', ''], dtype=object)
array(['Fender', 'Rob', ''], dtype=object)
array(['Williams', 'David R. A.', ''], dtype=object)
array(['Mooley', 'Kunal', ''], dtype=object)]
|
3,733 |
1207.6123
|
Manel Perucho Pla
|
Manel Perucho, Iv\'an Mart\'i-Vidal, Andrei P. Lobanov, Philip E.
Hardee
|
S5 0836+710: An FRII jet disrupted by the growth of a helical
instability?
|
Accepted for publication in Astronomy & Astrophysics
| null |
10.1051/0004-6361/201219785
| null |
astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The remarkable stability of extragalactic jets is surprising, given the
reasonable possibility of the growth of instabilities. In addition, much work
in the literature has invoked this possibility in order to explain observed jet
structures and obtain information from these structures. For example, it was
recently shown that the observed helical structures in the jet in S5 0836+710
could be associated with helical pressure waves generated by Kelvin-Helmholtz
instability. Our aim is to resolve the arc-second structure of the jet in the
quasar S5 0836+710 and confirm the lack of a hot-spot (reverse jet-shock) found
by present observing arrays, as this lack implies a loss of jet collimation
before interaction with the intergalactic medium. In this work, we use an
observation performed in 2008 using EVN and MERLIN. The combined data reduction
has provided a complete image of the object at arc-second scales. The lack of a
hot-spot in the arc-second radio structure is taken as evidence that the jet
losses its collimation between the VLBI region and the region of interaction
with the ambient medium. This result, together with the previous identification
of the helical structures in the jet with helical pressure waves that grow in
amplitude with distance, allow us to conclude that the jet is probably
disrupted by the growth of Kelvin-Helmholtz instability. This observational
evidence confirms that the physical parameters of jets can be extracted using
the assumption that instability is present in jets and can be the reason for
many observed structures. Interestingly, the observed jet is classified as a
FRII object in terms of its luminosity, but its large-scale morphology does not
correspond to this classification. The implications of this fact are discussed.
|
[{'version': 'v1', 'created': 'Wed, 25 Jul 2012 20:33:58 GMT'}]
|
2015-06-05
|
[array(['Perucho', 'Manel', ''], dtype=object)
array(['Martí-Vidal', 'Iván', ''], dtype=object)
array(['Lobanov', 'Andrei P.', ''], dtype=object)
array(['Hardee', 'Philip E.', ''], dtype=object)]
|
3,734 |
1908.06641
|
Stam Nicolis
|
Minos Axenides, Emmanuel Floratos and Stam Nicolis
|
The arithmetic geometry of AdS$_2$ and its continuum limit
|
22 pages, LaTeX2e, many PNG figures. v1: Uses utphys.bst for the
references. v2: Clarifications about the precursors, additional figures and
references. v3: Further clarifying remarks and references. v4: Streamlined
presentation; references added. v5: Further improvements of the presentation,
references added. v6: Final version, as published in SIGMA. The displayed
abstract is shortened
|
SIGMA 17 (2021), 004, 22 pages
|
10.3842/SIGMA.2021.004
| null |
hep-th gr-qc math-ph math.MP nlin.CD
|
http://creativecommons.org/licenses/by-sa/4.0/
|
According to the 't Hooft-Susskind holography, the black hole
entropy,$S_\mathrm{BH}$, is carried by the chaotic microscopic degrees of
freedom, which live in the near horizon region and have a Hilbert space of
states of finite dimension $d=\exp(S_\mathrm{BH})$. In previous work we have
proposed that the near horizon geometry, when the microscopic degrees of
freedom can be resolved, can be described by the AdS$_2[\mathbb{Z}_N]$
discrete, finite and random geometry, where $N\propto S_\mathrm{BH}$. It has
been constructed by purely arithmetic and group theoretical methods in order to
explain, in a direct way, the finiteness of the entropy, $S_\mathrm{BH}$. What
has been left as an open problem is how the smooth AdS$_2$ geometry can be
recovered, in the limit when $N\to\infty$. In the present article we solve this
problem, by showing that the discrete and finite AdS$_2[\mathbb{Z}_N]$ geometry
can be embedded in a family of finite geometries, AdS$_2^M[\mathbb{Z}_N]$,
where $M$ is another integer. This family can be constructed by an appropriate
toroidal compactification and discretization of the ambient $(2+1)$-dimensional
Minkowski space-time. In this construction $N$ and $M$ can be understood as
"infrared" and "ultraviolet" cutoffs respectively. The above construction
enables us to obtain the continuum limit of the AdS$_2^M[\mathbb{Z}_N]$
discrete and finite geometry, by taking both $N$ and $M$ to infinity in a
specific correlated way, following a reverse process: Firstly, by recovering
the continuous, toroidally compactified, AdS$_2[\mathbb{Z}_N]$ geometry by
removing the ultraviolet cutoff; secondly, by removing the infrared cutoff in a
specific decompactification limit, while keeping the radius of AdS$_2$ finite.
It is in this way that we recover the standard non-compact AdS$_2$ continuum
space-time. This method can be applied directly to higher-dimensional AdS
spacetimes.
|
[{'version': 'v1', 'created': 'Mon, 19 Aug 2019 08:39:50 GMT'}
{'version': 'v2', 'created': 'Thu, 5 Sep 2019 14:22:31 GMT'}
{'version': 'v3', 'created': 'Mon, 28 Oct 2019 14:36:34 GMT'}
{'version': 'v4', 'created': 'Tue, 6 Oct 2020 14:59:40 GMT'}
{'version': 'v5', 'created': 'Sat, 12 Dec 2020 14:16:57 GMT'}
{'version': 'v6', 'created': 'Sat, 9 Jan 2021 16:40:12 GMT'}]
|
2021-01-12
|
[array(['Axenides', 'Minos', ''], dtype=object)
array(['Floratos', 'Emmanuel', ''], dtype=object)
array(['Nicolis', 'Stam', ''], dtype=object)]
|
3,735 |
1111.5575
|
Michele Maggiore
|
Lukas Hollenstein, Maud Jaccard, Michele Maggiore and Ermis Mitsou
|
Zero-point quantum fluctuations in cosmology
|
23 pages, 9 figures. v3: refs added. To appear in Phys. Rev. D
|
Phys.Rev. D85 (2012) 124031
|
10.1103/PhysRevD.85.124031
| null |
astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We re-examine the classic problem of the renormalization of zero-point
quantum fluctuations in a Friedmann-Robertson-Walker background. We discuss a
number of issues that arise when regularizing the theory with a momentum-space
cutoff, and show explicitly how introducing non-covariant counter-terms allows
to obtain covariant results for the renormalized vacuum energy-momentum tensor.
We clarify some confusion in the literature concerning the equation of state of
vacuum fluctuations. Further, we point out that the general structure of the
effective action becomes richer if the theory contains a scalar field phi with
mass m smaller than the Hubble parameter H(t). Such an ultra-light particle
cannot be integrated out completely to get the effective action. Apart from the
volume term and the Einstein-Hilbert term, that are reabsorbed into
renormalizations of the cosmological constant and Newton's constant, the
effective action in general also has a term proportional to F(phi)R, for some
function F(phi). As a result, vacuum fluctuations of ultra-light scalar fields
naturally lead to models where the dark energy density has the form
rho_{DE}(t)=rho_X(t)+rho_Z(t), where rho_X is the component that accelerates
the Hubble expansion at late times and rho_Z(t) is an extra contribution
proportional to H^2(t). We perform a detailed comparison of such models with
CMB, SNIa and BAO data.
|
[{'version': 'v1', 'created': 'Wed, 23 Nov 2011 18:02:26 GMT'}
{'version': 'v2', 'created': 'Fri, 25 May 2012 15:15:24 GMT'}
{'version': 'v3', 'created': 'Wed, 30 May 2012 12:21:05 GMT'}]
|
2015-03-19
|
[array(['Hollenstein', 'Lukas', ''], dtype=object)
array(['Jaccard', 'Maud', ''], dtype=object)
array(['Maggiore', 'Michele', ''], dtype=object)
array(['Mitsou', 'Ermis', ''], dtype=object)]
|
3,736 |
1402.0208
|
Francesco Cellarosi
|
Francesco Cellarosi, Doug Hensley, Steven J. Miller, Jake L. Wellens
|
Continued fraction digit averages an Maclaurin's inequalities
|
32 pages, 7 figures. Substantial additions were made to previous
version, including Theorem 1.3, Section 6, and Appendix A
| null | null | null |
math.NT math.CA math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A classical result of Khinchin says that for almost all real numbers
$\alpha$, the geometric mean of the first $n$ digits $a_i(\alpha)$ in the
continued fraction expansion of $\alpha$ converges to a number $K =
2.6854520\ldots$ (Khinchin's constant) as $n \to \infty$. On the other hand,
for almost all $\alpha$, the arithmetic mean of the first $n$ continued
fraction digits $a_i(\alpha)$ approaches infinity as $n \to \infty$. There is a
sequence of refinements of the AM-GM inequality, Maclaurin's inequalities,
relating the $1/k$-th powers of the $k$-th elementary symmetric means of $n$
numbers for $1 \leq k \leq n$. On the left end (when $k=n$) we have the
geometric mean, and on the right end ($k=1$) we have the arithmetic mean.
We analyze what happens to the means of continued fraction digits of a
typical real number in the limit as one moves $f(n)$ steps away from either
extreme. We prove sufficient conditions on $f(n)$ to ensure to ensure
divergence when one moves $f(n)$ steps away from the arithmetic mean and
convergence when one moves $f(n)$ steps away from the geometric mean. For
typical $\alpha$ we conjecture the behavior for $f(n)=cn$, $0<c<1$.
We also study the limiting behavior of such means for quadratic irrational
$\alpha$, providing rigorous results, as well as numerically supported
conjectures.
|
[{'version': 'v1', 'created': 'Sun, 2 Feb 2014 16:16:40 GMT'}
{'version': 'v2', 'created': 'Mon, 10 Feb 2014 13:01:56 GMT'}
{'version': 'v3', 'created': 'Mon, 28 Jul 2014 22:25:01 GMT'}]
|
2014-07-30
|
[array(['Cellarosi', 'Francesco', ''], dtype=object)
array(['Hensley', 'Doug', ''], dtype=object)
array(['Miller', 'Steven J.', ''], dtype=object)
array(['Wellens', 'Jake L.', ''], dtype=object)]
|
3,737 |
2202.08025
|
Minghao Zhou
|
Minghao Zhou, Quanziang Wang, Jun Shu, Qian Zhao, Deyu Meng
|
Diagnosing Batch Normalization in Class Incremental Learning
| null | null | null | null |
cs.LG cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extensive researches have applied deep neural networks (DNNs) in class
incremental learning (Class-IL). As building blocks of DNNs, batch
normalization (BN) standardizes intermediate feature maps and has been widely
validated to improve training stability and convergence. However, we claim that
the direct use of standard BN in Class-IL models is harmful to both the
representation learning and the classifier training, thus exacerbating
catastrophic forgetting. In this paper we investigate the influence of BN on
Class-IL models by illustrating such BN dilemma. We further propose BN Tricks
to address the issue by training a better feature extractor while eliminating
classification bias. Without inviting extra hyperparameters, we apply BN Tricks
to three baseline rehearsal-based methods, ER, DER++ and iCaRL. Through
comprehensive experiments conducted on benchmark datasets of Seq-CIFAR-10,
Seq-CIFAR-100 and Seq-Tiny-ImageNet, we show that BN Tricks can bring
significant performance gains to all adopted baselines, revealing its potential
generality along this line of research.
|
[{'version': 'v1', 'created': 'Wed, 16 Feb 2022 12:38:43 GMT'}]
|
2022-02-17
|
[array(['Zhou', 'Minghao', ''], dtype=object)
array(['Wang', 'Quanziang', ''], dtype=object)
array(['Shu', 'Jun', ''], dtype=object)
array(['Zhao', 'Qian', ''], dtype=object)
array(['Meng', 'Deyu', ''], dtype=object)]
|
3,738 |
1404.6523
|
Zachariah Etienne
|
Zachariah B. Etienne, John G. Baker, Vasileios Paschalidis, Bernard J.
Kelly, Stuart L. Shapiro
|
Improved Moving Puncture Gauge Conditions for Compact Binary Evolutions
|
25 pages, 16 figures, 2 tables. Matches published version
|
Phys. Rev. D 90, 064032 (2014)
|
10.1103/PhysRevD.90.064032
| null |
astro-ph.HE gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Robust gauge conditions are critically important to the stability and
accuracy of numerical relativity (NR) simulations involving compact objects.
Most of the NR community use the highly robust---though
decade-old---moving-puncture (MP) gauge conditions for such simulations. It has
been argued that in binary black hole (BBH) evolutions adopting this gauge,
noise generated near adaptive-mesh-refinement (AMR) boundaries does not
converge away cleanly with increasing resolution, severely limiting
gravitational waveform accuracy at computationally feasible resolutions. We
link this noise to a sharp (short-wavelength), initial outgoing gauge wave
crossing into progressively lower resolution AMR grids, and present
improvements to the standard MP gauge conditions that focus on stretching,
smoothing, and more rapidly settling this outgoing wave. Our best gauge choice
greatly reduces gravitational waveform noise during inspiral, yielding less
fluctuation in convergence order and $\sim 40%$ lower waveform phase and
amplitude errors at typical resolutions. Noise in other physical quantities of
interest is also reduced, and constraint violations drop by more than an order
of magnitude. We expect these improvements will carry over to simulations of
all types of compact binary systems, as well as other $N$+1 formulations of
gravity for which MP-like gauge conditions can be chosen.
|
[{'version': 'v1', 'created': 'Fri, 25 Apr 2014 20:00:00 GMT'}
{'version': 'v2', 'created': 'Mon, 6 Oct 2014 02:22:14 GMT'}]
|
2014-10-07
|
[array(['Etienne', 'Zachariah B.', ''], dtype=object)
array(['Baker', 'John G.', ''], dtype=object)
array(['Paschalidis', 'Vasileios', ''], dtype=object)
array(['Kelly', 'Bernard J.', ''], dtype=object)
array(['Shapiro', 'Stuart L.', ''], dtype=object)]
|
3,739 |
2106.01470
|
Sanjaye Ramgoolam
|
Joseph Ben Geloun and Sanjaye Ramgoolam
|
All-orders asymptotics of tensor model observables from symmetries of
restricted partitions
|
44 pages
| null |
10.1088/1751-8121/ac9b3b
|
QMUL-PH-21-20
|
hep-th math.CO math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The counting of the dimension of the space of $U(N) \times U(N) \times U(N)$
polynomial invariants of a complex $3$-index tensor as a function of degree $n$
is known in terms of a sum of squares of Kronecker coefficients. For $n \le N$,
the formula can be expressed in terms of a sum of symmetry factors of
partitions of $n$ denoted $Z_3(n)$. We derive the large $n$ all-orders
asymptotic formula for $ Z_3(n)$ making contact with high order results
previously obtained numerically. The derivation relies on the dominance in the
sum, of partitions with many parts of length $1$. The dominance of other small
parts in restricted partition sums leads to related asymptotic results. The
result for the $3$-index tensor observables gives the large $n$ asymptotic
expansion for the counting of bipartite ribbon graphs with $n$ edges, and for
the dimension of the associated Kronecker permutation centralizer algebra. We
explain how the different terms in the asymptotics are associated with
probability distributions over ribbon graphs. The large $n$ dominance of small
parts also leads to conjectured formulae for the asymptotics of invariants for
general $d$-index tensors. The coefficients of $ 1/n$ in these expansions
involve Stirling numbers of the second kind along with restricted partition
sums.
|
[{'version': 'v1', 'created': 'Wed, 2 Jun 2021 21:10:06 GMT'}]
|
2022-11-23
|
[array(['Geloun', 'Joseph Ben', ''], dtype=object)
array(['Ramgoolam', 'Sanjaye', ''], dtype=object)]
|
3,740 |
1608.02191
|
Neda Petreska
|
Neda Petreska and Hussein Al-Zubaidy and Rudi Knorr and James Gross
|
Bound-Based Power Optimization for Multi-Hop Heterogeneous Wireless
Industrial Networks Under Statistical Delay Constraints
| null | null | null | null |
cs.PF cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The noticeably increased deployment of wireless networks for battery-limited
industrial applications in recent years highlights the need for tractable
performance analysis methodologies as well as efficient QoS-aware transmit
power management schemes. In this work, we seek to combine several important
aspects of such networks, i.e., multi-hop connectivity, channel heterogeneity
and the queuing effect, in order to address these needs. We design
delay-bound-based algorithms for transmit power minimization and network
lifetime maximization of multi-hop heterogeneous wireless networks using our
previously developed stochastic network calculus approach for performance
analysis of a cascade of buffered wireless fading channels. Our analysis shows
an overall transmit power saving of up to 95% compared to a fixed power
allocation scheme when using a service model in terms of the Shannon capacity
limit. For a more realistic set-up, we evaluate the performance of the
suggested algorithm in a WirelessHART network, which is a widely used
communication standard for process automation and other industrial
applications. We find that link heterogeneity can significantly reduce network
lifetime when no efficient power management is applied. Moreover, we show,
using extensive simulation study, that the proposed bound-based power
allocation performs reasonably well compared to the real optimum, especially in
the case of WirelessHART networks.
|
[{'version': 'v1', 'created': 'Sun, 7 Aug 2016 07:56:22 GMT'}
{'version': 'v2', 'created': 'Tue, 30 Aug 2016 12:42:06 GMT'}
{'version': 'v3', 'created': 'Mon, 21 Aug 2017 13:40:25 GMT'}]
|
2017-08-22
|
[array(['Petreska', 'Neda', ''], dtype=object)
array(['Al-Zubaidy', 'Hussein', ''], dtype=object)
array(['Knorr', 'Rudi', ''], dtype=object)
array(['Gross', 'James', ''], dtype=object)]
|
3,741 |
1506.01775
|
David Wood
|
Daniel J. Harvey and David R. Wood
|
Average degree conditions forcing a minor
| null |
Electronic J. Combinatorics 23:1.42, 2016
| null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Mader first proved that high average degree forces a given graph as a minor.
Often motivated by Hadwiger's Conjecture, much research has focused on the
average degree required to force a complete graph as a minor. Subsequently,
various authors have consider the average degree required to force an arbitrary
graph $H$ as a minor. Here, we strengthen (under certain conditions) a recent
result by Reed and Wood, giving better bounds on the average degree required to
force an $H$-minor when $H$ is a sparse graph with many high degree vertices.
This solves an open problem of Reed and Wood, and also generalises (to within a
constant factor) known results when $H$ is an unbalanced complete bipartite
graph.
|
[{'version': 'v1', 'created': 'Fri, 5 Jun 2015 04:45:45 GMT'}]
|
2017-07-18
|
[array(['Harvey', 'Daniel J.', ''], dtype=object)
array(['Wood', 'David R.', ''], dtype=object)]
|
3,742 |
2107.08068
|
Mark Gluzman
|
J. G. Dai and Mark Gluzman
|
Refined Policy Improvement Bounds for MDPs
|
Workshop on Reinforcement Learning Theory, ICML 2021
| null | null | null |
cs.LG cs.AI math.OC
|
http://creativecommons.org/licenses/by/4.0/
|
The policy improvement bound on the difference of the discounted returns
plays a crucial role in the theoretical justification of the trust-region
policy optimization (TRPO) algorithm. The existing bound leads to a degenerate
bound when the discount factor approaches one, making the applicability of TRPO
and related algorithms questionable when the discount factor is close to one.
We refine the results in \cite{Schulman2015, Achiam2017} and propose a novel
bound that is "continuous" in the discount factor. In particular, our bound is
applicable for MDPs with the long-run average rewards as well.
|
[{'version': 'v1', 'created': 'Fri, 16 Jul 2021 18:22:30 GMT'}]
|
2021-07-20
|
[array(['Dai', 'J. G.', ''], dtype=object)
array(['Gluzman', 'Mark', ''], dtype=object)]
|
3,743 |
1811.05263
|
Juergen Reuter
|
J\"urgen Reuter
|
The Role of Positron Polarization for the initial 250 GeV stage of the
ILC
|
4 pages, to be submitted to proceedings of ICHEP 2018, presented on
behalf of the Physics Working Group of the LCC Collaboration
| null | null |
DESY 18-193
|
hep-ph hep-ex physics.ins-det
|
http://creativecommons.org/licenses/by/4.0/
|
The International Linear Collider is now proposed with a staged machine
design, with the first stage at $\sqrt{s}=250$ GeV and an integrated luminosity
goal of 2 ab${}^{-1}$. One of the questions for the machine design is the
importance of positron polarization. In this report, we review the impact of
positron polarization on the physics goals of the 250 GeV stage of the ILC and
demonstrate that positron polarization has distinct advantages.
|
[{'version': 'v1', 'created': 'Tue, 13 Nov 2018 12:47:16 GMT'}]
|
2018-11-14
|
[array(['Reuter', 'Jürgen', ''], dtype=object)]
|
3,744 |
1806.01156
|
Victor Le Pochat
|
Victor Le Pochat, Tom Van Goethem, Samaneh Tajalizadehkhoob, Maciej
Korczy\'nski and Wouter Joosen
|
Tranco: A Research-Oriented Top Sites Ranking Hardened Against
Manipulation
|
Our online service providing the Tranco ranking is available at
https://tranco-list.eu
|
Proceedings of the 26th Annual Network and Distributed System
Security Symposium (NDSS), 2019
|
10.14722/ndss.2019.23386
| null |
cs.CR cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In order to evaluate the prevalence of security and privacy practices on a
representative sample of the Web, researchers rely on website popularity
rankings such as the Alexa list. While the validity and representativeness of
these rankings are rarely questioned, our findings show the contrary: we show
for four main rankings how their inherent properties (similarity, stability,
representativeness, responsiveness and benignness) affect their composition and
therefore potentially skew the conclusions made in studies. Moreover, we find
that it is trivial for an adversary to manipulate the composition of these
lists. We are the first to empirically validate that the ranks of domains in
each of the lists are easily altered, in the case of Alexa through as little as
a single HTTP request. This allows adversaries to manipulate rankings on a
large scale and insert malicious domains into whitelists or bend the outcome of
research studies to their will. To overcome the limitations of such rankings,
we propose improvements to reduce the fluctuations in list composition and
guarantee better defenses against manipulation. To allow the research community
to work with reliable and reproducible rankings, we provide Tranco, an improved
ranking that we offer through an online service available at
https://tranco-list.eu.
|
[{'version': 'v1', 'created': 'Mon, 4 Jun 2018 15:10:27 GMT'}
{'version': 'v2', 'created': 'Thu, 1 Nov 2018 17:47:21 GMT'}
{'version': 'v3', 'created': 'Mon, 17 Dec 2018 14:35:30 GMT'}]
|
2018-12-18
|
[array(['Pochat', 'Victor Le', ''], dtype=object)
array(['Van Goethem', 'Tom', ''], dtype=object)
array(['Tajalizadehkhoob', 'Samaneh', ''], dtype=object)
array(['Korczyński', 'Maciej', ''], dtype=object)
array(['Joosen', 'Wouter', ''], dtype=object)]
|
3,745 |
hep-ex/9809028
|
John Dainton
|
C. Adloff, et al. (H1 Collaboration)
|
Forward Jet and Particle Production at HERA
|
20 pages, 5 figures, 2 tables, submitted to Nucl. Phys. B
|
Nucl.Phys.B538:3-22,1999
|
10.1016/S0550-3213(98)00745-7
|
DESY 98-143
|
hep-ex
| null |
Single particles and jets in deeply inelastic scattering at low x are
measured with the H1 detector in the region away from the current jet and
towards the proton remnant, known as the forward region. Hadronic final state
measurements in this region are expected to be particularly sensitive to QCD
evolution effects. Jet cross-sections are presented as a function of Bjorken-x
for forward jets produced with a polar angle to the proton direction, theta, in
the range 7 < theta < 20 degrees. Azimuthal correlations are studied between
the forward jet and the scattered lepton. Charged and neutral single particle
production in the forward region are measured as a function of Bjorken-x, in
the range 5 < theta < 25 degrees, for particle transverse momenta larger than 1
GeV. QCD based Monte Carlo predictions and analytical calculations based on
BFKL, CCFM and DGLAP evolution are compared to the data. Predictions based on
the DGLAP approach fail to describe the data, except for those which allow for
a resolved photon contribution.
|
[{'version': 'v1', 'created': 'Thu, 24 Sep 1998 09:34:07 GMT'}]
|
2010-03-25
|
[array(['Adloff', 'C.', ''], dtype=object)]
|
3,746 |
2009.10202
|
Ojas Kanhere
|
Ojas Kanhere, Theodore S. Rappaport
|
Millimeter Wave Position Location using Multipath Differentiation for
3GPP using Field Measurements
|
GLOBECOM 2020 - 2020 IEEE Global Communications Conference, Taipei,
Taiwan, Dec. 2020
| null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
3GPP air interface standards support meter-level position location of a user
in a cellular network. With wider bandwidths and narrow antenna beamwidths
available at mmWave frequencies, cellular networks now have the potential to
provide sub-meter position location for each user. In this work, we provide an
overview of 3GPP position location techniques that are designed for
line-of-sight propagation. We discuss additional measurements required in the
3GPP standard that enable multipath-based non-line-of-sight position location.
Further, we validate the concepts in this paper by using field data to test a
map-based position location algorithm in an indoor office environment which has
dimensions of 35 m by 65.5 m. We demonstrate how the fusion of angle of arrival
and time of flight information in concert with a 3-D map of the office provides
a mean accuracy of 5.72 cm at 28 GHz and 6.29 cm at 140 GHz, over 23 receiver
distances ranging from 4.2 m to 32.3 m, using a single base station in
line-of-sight and non-line-of-sight. We also conduct a theoretical analysis of
the typical error experienced in the map-based position location algorithm and
show that the complexity of the map-based algorithm is low enough to allow
real-time implementation.
|
[{'version': 'v1', 'created': 'Mon, 21 Sep 2020 22:21:22 GMT'}]
|
2020-09-23
|
[array(['Kanhere', 'Ojas', ''], dtype=object)
array(['Rappaport', 'Theodore S.', ''], dtype=object)]
|
3,747 |
0904.4275
|
Rupert Frank
|
Rupert L. Frank, Elliott H. Lieb
|
Inversion positivity and the sharp Hardy-Littlewood-Sobolev inequality
|
15 pages; references added and minor changes
|
Calc. Var. Partial Differential Equations 39 (2010), no. 1 - 2, 85
- 99
| null | null |
math.FA math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give a new proof of certain cases of the sharp HLS inequality. Instead of
symmetric decreasing rearrangement it uses the reflection positivity of
inversions in spheres. In doing this we extend a characterization of the
minimizing functions due to Li and Zhu.
|
[{'version': 'v1', 'created': 'Mon, 27 Apr 2009 22:39:30 GMT'}
{'version': 'v2', 'created': 'Mon, 23 Nov 2009 23:12:43 GMT'}]
|
2011-09-05
|
[array(['Frank', 'Rupert L.', ''], dtype=object)
array(['Lieb', 'Elliott H.', ''], dtype=object)]
|
3,748 |
2206.02209
|
Siddharth Gautam
|
Sadique Vellamarthodika and Siddharth Gautam
|
Role of Orientational Disorder in ZSM-22 in the Adsorption of SO$_2$
|
13 pages, 9 figures, 2 tables
| null |
10.1080/00268976.2022.2117663
| null |
cond-mat.mtrl-sci physics.chem-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Computational studies addressing the adsorption of fluids in nano-porous
materials mostly use ideal single crystal models of the adsorbent. While a few
recent studies have tried to address the effects of inter-crystalline spacing
on the adsorption of fluids in polycrystalline models of nano-porous materials,
the effects of the orientational disorder in the polycrystalline adsorbent
remain unexplored. Here we report the adsorption of SO$_2$, an industrially and
environmentally important gas, in ZSM-22, a zeolite characterized by straight
channel like pores. The simple pore geometry of ZSM-22 helps us make
polycrystalline models of the adsorbent with different degrees of orientational
disorder. Using grand canonical Monte Carlo (GCMC) simulations, we obtain the
adsorption isotherms of SO$_2$ in ZSM-22 with different inter-crystalline
spacings and degree of orientational disorder. Introducing inter-crystalline
space is found to enhance the adsorption capacity, with a larger
inter-crystalline space leading to higher adsorption. Increasing the
orientational disorder of the adsorbent is found to enhance the adsorption
capacity too. However, the effects of orientational disorder become weaker when
the inter-crystalline space is widened. This weakening of the effect of
orientational disorder is a result of an interplay between the width of the
inter-crystalline space and the strength of guest-guest interactions.
|
[{'version': 'v1', 'created': 'Sun, 5 Jun 2022 15:53:43 GMT'}]
|
2022-09-05
|
[array(['Vellamarthodika', 'Sadique', ''], dtype=object)
array(['Gautam', 'Siddharth', ''], dtype=object)]
|
3,749 |
1710.04930
|
Sergey Korotin
|
S. M. Andrievsky, S. A. Korotin, V. Hill, and A.V. Zhukova
|
Barium abundance in the central part of the dSph Fornax galaxy
|
5 pages, 2 figures
| null |
10.18524/1810-4215.2017.30.117154
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisited barium abundance in a sample of giant stars in the dwarf
spheroidal Fornax galaxy. Non-local thermodynamic equilibrium (NLTE) synthesis
was used to derive the barium abundance from two Ba II lines. Our new NLTE
result for barium shows that in the range of metallicities from -1 to -0.5 the
abundance of this element is almost the same as in the stars of the Milky Way.
We conclude that the evolution of barium abundance in the dSph Fornax galaxy
resembles that of the Milky Way at the epoch of the corresponding metallicity
level.
|
[{'version': 'v1', 'created': 'Fri, 13 Oct 2017 14:04:13 GMT'}]
|
2018-01-31
|
[array(['Andrievsky', 'S. M.', ''], dtype=object)
array(['Korotin', 'S. A.', ''], dtype=object)
array(['Hill', 'V.', ''], dtype=object)
array(['Zhukova', 'A. V.', ''], dtype=object)]
|
3,750 |
1412.6080
|
Daniel Augot
|
Daniel Augot (LIX)
|
Generalization of Gabidulin Codes over Fields of Rational Functions
|
21st International Symposium on Mathematical Theory of Networks and
Systems (MTNS 2014), Jul 2014, Groningen, Netherlands.
https://fwn06.housing.rug.nl/mtns2014/
| null | null | null |
cs.SC cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We transpose the theory of rank metric and Gabidulin codes to the case of
fields which are not finite fields. The Frobenius automorphism is replaced by
any element of the Galois group of a cyclic algebraic extension of a base
field. We use our framework to define Gabidulin codes over the field of
rational functions using algebraic function fields with a cyclic Galois group.
This gives a linear subspace of matrices whose coefficients are rational
function, such that the rank of each of this matrix is lower bounded, where the
rank is comprised in term of linear combination with rational functions. We
provide two examples based on Kummer and Artin-Schreier extensions.The matrices
that we obtain may be interpreted as generating matrices of convolutional
codes.
|
[{'version': 'v1', 'created': 'Mon, 15 Dec 2014 15:12:13 GMT'}]
|
2014-12-19
|
[array(['Augot', 'Daniel', '', 'LIX'], dtype=object)]
|
3,751 |
1602.03333
|
Timo Beller
|
Timo Beller and Enno Ohlebusch
|
A representation of a compressed de Bruijn graph for pan-genome analysis
that enables search
|
Submitted to Algorithmica special issue of CPM2015
| null | null | null |
cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, Marcus et al. (Bioinformatics 2014) proposed to use a compressed de
Bruijn graph to describe the relationship between the genomes of many
individuals/strains of the same or closely related species. They devised an
$O(n \log g)$ time algorithm called splitMEM that constructs this graph
directly (i.e., without using the uncompressed de Bruijn graph) based on a
suffix tree, where $n$ is the total length of the genomes and $g$ is the length
of the longest genome. In this paper, we present a construction algorithm that
outperforms their algorithm in theory and in practice. Moreover, we propose a
new space-efficient representation of the compressed de Bruijn graph that adds
the possibility to search for a pattern (e.g. an allele - a variant form of a
gene) within the pan-genome.
|
[{'version': 'v1', 'created': 'Wed, 10 Feb 2016 11:41:06 GMT'}]
|
2016-02-11
|
[array(['Beller', 'Timo', ''], dtype=object)
array(['Ohlebusch', 'Enno', ''], dtype=object)]
|
3,752 |
1708.06186
|
Kunal Bhattacharya
|
Kunal Bhattacharya, Venla Berg, Asim Ghosh, Daniel Monsivais, Janos
Kertesz, Anna Rotkirch, and Kimmo Kaski
|
Network of families in a contemporary population: regional and cultural
assortativity
|
25 pages, 12 figures
| null | null | null |
physics.soc-ph cond-mat.dis-nn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using a large dataset with individual-level demographic information of 60,000
families in contemporary Finland, we analyse the variation and cultural
assortativity in a network of families. Families are considered as vertices and
unions between males and females who have a common child and belong to
different families are considered as edges in such a network of families. The
sampled network is a collection of many disjoint components with the largest
connected component being dominated by families rooted in one specific region.
We characterize the network in terms of the basic structural properties and
then explore the network transitivity and assortativity with regards to regions
of origin and linguistic identity. Transitivity is seen to result from
linguistic homophily in the network. Overall, our results demonstrate that
geographic proximity and language strongly influence the structuring of
network.
|
[{'version': 'v1', 'created': 'Mon, 21 Aug 2017 12:34:27 GMT'}
{'version': 'v2', 'created': 'Tue, 22 Aug 2017 12:07:01 GMT'}]
|
2017-08-23
|
[array(['Bhattacharya', 'Kunal', ''], dtype=object)
array(['Berg', 'Venla', ''], dtype=object)
array(['Ghosh', 'Asim', ''], dtype=object)
array(['Monsivais', 'Daniel', ''], dtype=object)
array(['Kertesz', 'Janos', ''], dtype=object)
array(['Rotkirch', 'Anna', ''], dtype=object)
array(['Kaski', 'Kimmo', ''], dtype=object)]
|
3,753 |
1206.6737
|
Irais Bautista
|
Irais Bautista, Carlos Pajares, Jos\'e Guilherme Milhano and Jorge
Dias de Deus
|
Rapidity dependence of particle densities in pp and AA collisions
|
12 pages, 6 figures
| null |
10.1103/PhysRevC.86.034909
| null |
nucl-th hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use multiple scattering and energy conservation arguments to describe
$dn/d\eta_{NANA}$ as a function of $dn/d\eta_{pp}$ in the framework of string
percolation. We discuss the pseudo-rapidity $\eta$? and beam rapidity Y
dependence of particle densities. We present our results for pp, Au- Au, and
Pb-Pb collisions at RHIC and LHC.
|
[{'version': 'v1', 'created': 'Thu, 28 Jun 2012 15:46:57 GMT'}]
|
2015-06-05
|
[array(['Bautista', 'Irais', ''], dtype=object)
array(['Pajares', 'Carlos', ''], dtype=object)
array(['Milhano', 'José Guilherme', ''], dtype=object)
array(['de Deus', 'Jorge Dias', ''], dtype=object)]
|
3,754 |
math/0406458
|
D. Gwion Evans
|
D. Gwion Evans
|
On the K-theory of higher rank graph C*-algebras
|
23 pages. To appear in the New York Journal of Mathematics
(http://nyjm.albany.edu:8000/). Revisions include: a different numbering
system for sections, theorems and related parts; correction of typographical
errors; re-organisation of results; and addition of examples (Section 5)
| null | null | null |
math.OA math.KT
| null |
Given a row-finite $k$-graph $\Lambda$ with no sources we investigate the
$K$-theory of the higher rank graph $C^*$-algebra, $C^*(\Lambda)$. When $k=2$
we are able to give explicit formulae to calculate the $K$-groups of
$C^*(\Lambda)$. The $K$-groups of $C^*(\Lambda)$ for $k>2$ can be calculated
under certain circumstances and we consider the case $k=3$. We prove that for
arbitrary $k$, the torsion-free rank of $K_0(C^*(\Lambda))$ and
$K_1(C^*\Lambda))$ are equal when $C^*(\Lambda)$ is unital, and for $k=2$ we
determine the position of the class of the unit of $C^*(\Lambda)$ in
$K_0(C^*(\Lambda))$.
|
[{'version': 'v1', 'created': 'Wed, 23 Jun 2004 10:43:19 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Dec 2007 20:53:34 GMT'}]
|
2007-12-18
|
[array(['Evans', 'D. Gwion', ''], dtype=object)]
|
3,755 |
2004.07164
|
Aleksey Tikhonov
|
Viktor E. Asadchikov, Yuri O. Volkov, Alexander D. Nuzhdin, Boris S.
Roshchin and Aleksey M. Tikhonov
|
Prospects for the Use of Laboratory Sources for X-ray Reflectometry of
Thin Films on a Liquid Surface
|
5 pages, 5 figures
|
RENSIT 12(1), 145 (2020)
| null | null |
cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The authors present a review of the systematic studies of the structure of
macroscopically planar thin films at the air-liquid interface (water, alkali
solution and silica hydrosol). A common feature of the considered works is the
application of a model-independent approach to the analysis of X-ray
reflectometry data, which does not require a priori assumptions about the
structure of the object under study. It is shown that the experimental results
obtained with the laboratory source in some cases are qualitatively on par with
the results of those obtained with the use of synchrotron radiation source. The
reproducibility of the effect of spontaneous ordering in films of amphiphilic
organic molecules (phospholipids) at the surface of the colloidal solution of
silica nanoparticles is demonstrated. The possibility of influencing the
kinetics of the in situ formation of a phospholipid film by enriching the
liquid substrate with alkali metal ions is also discussed.
|
[{'version': 'v1', 'created': 'Wed, 15 Apr 2020 15:47:55 GMT'}]
|
2020-04-16
|
[array(['Asadchikov', 'Viktor E.', ''], dtype=object)
array(['Volkov', 'Yuri O.', ''], dtype=object)
array(['Nuzhdin', 'Alexander D.', ''], dtype=object)
array(['Roshchin', 'Boris S.', ''], dtype=object)
array(['Tikhonov', 'Aleksey M.', ''], dtype=object)]
|
3,756 |
2008.04653
|
Feng Xia
|
Feng Xia, Nana Yaw Asabere, Haifeng Liu, Zhen Chen, and Wei Wang
|
Socially-Aware Conference Participant Recommendation with Personality
Traits
|
12 pages, 13 figures
|
IEEE Systems Journal, 11(4): 2255-2266, 2017
|
10.1109/JSYST.2014.2342375
| null |
cs.SI cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As a result of the importance of academic collaboration at smart conferences,
various researchers have utilized recommender systems to generate effective
recommendations for participants. Recent research has shown that the
personality traits of users can be used as innovative entities for effective
recommendations. Nevertheless, subjective perceptions involving the personality
of participants at smart conferences are quite rare and haven't gained much
attention. Inspired by the personality and social characteristics of users, we
present an algorithm called Socially and Personality Aware Recommendation of
Participants (SPARP). Our recommendation methodology hybridizes the
computations of similar interpersonal relationships and personality traits
among participants. SPARP models the personality and social characteristic
profiles of participants at a smart conference. By combining the above
recommendation entities, SPARP then recommends participants to each other for
effective collaborations. We evaluate SPARP using a relevant dataset.
Experimental results confirm that SPARP is reliable and outperforms other
state-of-the-art methods.
|
[{'version': 'v1', 'created': 'Sun, 9 Aug 2020 03:43:37 GMT'}]
|
2020-08-12
|
[array(['Xia', 'Feng', ''], dtype=object)
array(['Asabere', 'Nana Yaw', ''], dtype=object)
array(['Liu', 'Haifeng', ''], dtype=object)
array(['Chen', 'Zhen', ''], dtype=object)
array(['Wang', 'Wei', ''], dtype=object)]
|
3,757 |
2106.03260
|
Daozhi Han
|
Wenbin Chen, Daozhi Han, Cheng Wang, Shufen Wang, Xiaoming Wang,
Yichao Zhang
|
Error estimate of a decoupled numerical scheme for the
Cahn-Hilliard-Stokes-Darcy system
| null | null | null | null |
math.NA cs.NA
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
We analyze a fully discrete finite element numerical scheme for the
Cahn-Hilliard-Stokes-Darcy system that models two-phase flows in coupled free
flow and porous media. To avoid a well-known difficulty associated with the
coupling between the Cahn-Hilliard equation and the fluid motion, we make use
of the operator-splitting in the numerical scheme, so that these two solvers
are decoupled, which in turn would greatly improve the computational
efficiency. The unique solvability and the energy stability have been proved
in~\cite{CHW2017}. In this work, we carry out a detailed convergence analysis
and error estimate for the fully discrete finite element scheme, so that the
optimal rate convergence order is established in the energy norm, i.e.,, in the
$\ell^\infty (0, T; H^1) \cap \ell^2 (0, T; H^2)$ norm for the phase variables,
as well as in the $\ell^\infty (0, T; H^1) \cap \ell^2 (0, T; H^2)$ norm for
the velocity variable. Such an energy norm error estimate leads to a
cancellation of a nonlinear error term associated with the convection part,
which turns out to be a key step to pass through the analysis. In addition, a
discrete $\ell^2 (0;T; H^3)$ bound of the numerical solution for the phase
variables plays an important role in the error estimate, which is accomplished
via a discrete version of Gagliardo-Nirenberg inequality in the finite element
setting.
|
[{'version': 'v1', 'created': 'Sun, 6 Jun 2021 22:07:21 GMT'}]
|
2021-06-08
|
[array(['Chen', 'Wenbin', ''], dtype=object)
array(['Han', 'Daozhi', ''], dtype=object)
array(['Wang', 'Cheng', ''], dtype=object)
array(['Wang', 'Shufen', ''], dtype=object)
array(['Wang', 'Xiaoming', ''], dtype=object)
array(['Zhang', 'Yichao', ''], dtype=object)]
|
3,758 |
1110.4680
|
Michael Barnsley
|
Michael Barnsley and Andrew Vince
|
Fractal Homeomorphism for Bi-affine Iterated Function Systems
| null | null | null | null |
math.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper concerns fractal homeomorphism between the attractors of two
bi-affine iterated function systems. After a general discussion of bi-affine
functions, conditions are provided under which a bi-affine iterated function
system is contractive, thus guaranteeing an attractor. After a general
discussion of fractal homeomorphism, fractal homeomorphisms are constructed for
a specific type of bi-affine iterated function system.
|
[{'version': 'v1', 'created': 'Fri, 21 Oct 2011 01:16:57 GMT'}]
|
2011-10-24
|
[array(['Barnsley', 'Michael', ''], dtype=object)
array(['Vince', 'Andrew', ''], dtype=object)]
|
3,759 |
1112.2962
|
Pablo Huijse
|
Pablo Huijse, Pablo A. Est\'evez, Pablo Zegers, Jos\'e Pr\'incipe,
Pavlos Protopapas
|
Period Estimation in Astronomical Time Series Using Slotted Correntropy
| null |
IEEE Signal Processing Letters, vol. 18, no. 6, pp. 371-374, year
2011
|
10.1109/LSP.2011.2141987
| null |
cs.IT astro-ph.IM math.IT stat.ML
|
http://creativecommons.org/licenses/by/3.0/
|
In this letter, we propose a method for period estimation in light curves
from periodic variable stars using correntropy. Light curves are astronomical
time series of stellar brightness over time, and are characterized as being
noisy and unevenly sampled. We propose to use slotted time lags in order to
estimate correntropy directly from irregularly sampled time series. A new
information theoretic metric is proposed for discriminating among the peaks of
the correntropy spectral density. The slotted correntropy method outperformed
slotted correlation, string length, VarTools (Lomb-Scargle periodogram and
Analysis of Variance), and SigSpec applications on a set of light curves drawn
from the MACHO survey.
|
[{'version': 'v1', 'created': 'Tue, 13 Dec 2011 17:09:19 GMT'}]
|
2014-12-08
|
[array(['Huijse', 'Pablo', ''], dtype=object)
array(['Estévez', 'Pablo A.', ''], dtype=object)
array(['Zegers', 'Pablo', ''], dtype=object)
array(['Príncipe', 'José', ''], dtype=object)
array(['Protopapas', 'Pavlos', ''], dtype=object)]
|
3,760 |
2106.08211
|
Zhang Jicheng
|
Jicheng Zhang and Yizhou Peng and Pham Van Tung and Haihua Xu and Hao
Huang and Eng Siong Chng
|
E2E-based Multi-task Learning Approach to Joint Speech and Accent
Recognition
| null | null | null | null |
eess.AS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we propose a single multi-task learning framework to perform
End-to-End (E2E) speech recognition (ASR) and accent recognition (AR)
simultaneously. The proposed framework is not only more compact but can also
yield comparable or even better results than standalone systems. Specifically,
we found that the overall performance is predominantly determined by the ASR
task, and the E2E-based ASR pretraining is essential to achieve improved
performance, particularly for the AR task. Additionally, we conduct several
analyses of the proposed method. First, though the objective loss for the AR
task is much smaller compared with its counterpart of ASR task, a smaller
weighting factor with the AR task in the joint objective function is necessary
to yield better results for each task. Second, we found that sharing only a few
layers of the encoder yields better AR results than sharing the overall
encoder. Experimentally, the proposed method produces WER results close to the
best standalone E2E ASR ones, while it achieves 7.7% and 4.2% relative
improvement over standalone and single-task-based joint recognition methods on
test set for accent recognition respectively.
|
[{'version': 'v1', 'created': 'Tue, 15 Jun 2021 15:17:08 GMT'}]
|
2021-06-16
|
[array(['Zhang', 'Jicheng', ''], dtype=object)
array(['Peng', 'Yizhou', ''], dtype=object)
array(['Van Tung', 'Pham', ''], dtype=object)
array(['Xu', 'Haihua', ''], dtype=object)
array(['Huang', 'Hao', ''], dtype=object)
array(['Chng', 'Eng Siong', ''], dtype=object)]
|
3,761 |
1701.00286
|
Fabio Siringo
|
Fabio Siringo
|
From condensed matter to QCD: a journey through gauge theories on board
of a variational tool
|
International workshop "Correlations in Condensed Matter under
Extreme Conditions, A tribute to Renato Pucci on the occasion of his 70th
birthday", Catania, 23.09.2016, Chapter 24 in "Correlations in Condensed
Matter under Extreme Conditions: A tribute to Renato Pucci on the occasion of
his 70th birthday", edited by G. G. N. Angilella and A. La Magna (New York,
Springer, 2017)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Starting with a review of the thermal fluctuations in superconductors, the
Gaussian Effective Potential is shown to be a powerful variational tool for the
study of the breaking of symmetry in gauge theories. A novel re-derivation of
the massive expansion for QCD is presented, showing its variational nature and
its origin from the Gaussian potential that also provides a variational proof
for chiral symmetry breaking and dynamical generation of a gluon mass.
|
[{'version': 'v1', 'created': 'Sun, 1 Jan 2017 20:18:54 GMT'}]
|
2017-01-03
|
[array(['Siringo', 'Fabio', ''], dtype=object)]
|
3,762 |
2206.04586
|
Xiang Liu
|
Si-Qiang Luo, Li-Sheng Geng, Xiang Liu
|
Double-charm heptaquark states composed of two charmed mesons and one
nucleon
|
9 pages, 4 figures, 2 tables
|
Phys. Rev. D, 106, 014017 (2022)
|
10.1103/PhysRevD.106.014017
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the experimental discoveries of $T_{cc}$, $\Sigma_c(2800)$, and
$\Lambda_c(2940)$ and the theoretical picture where they are $DD^*$, $DN$, and
$D^*N$ molecular candidates, we investigate the double charm heptaquark system
of $DD^*N$. We employ the one-boson-exchange model to deduce the pairwise
$D$-$D^*$, $D$-$N$, and $D^*$-$N$ potentials and then study the $DD^*N$ system
with the Gaussian expansion method. We find two good hadronic molecular
candidates with $I(J^P)=\frac{1}{2}(\frac{1}{2}^-)$ and
$\frac{1}{2}(\frac{3}{2}^-)$ $DD^*N$ with only $s$-wave pairwise interactions.
The conclusion remains unchanged even taking into account the $S$-$D$ mixing
and coupled channel effects. In addition to providing the binding energies, we
also calculate the root-mean-square radii of the $DD^*N$ system, which further
support the molecular nature of the predicted states. They can be searched for
at the upcoming LHC run 3 and run 4.
|
[{'version': 'v1', 'created': 'Thu, 9 Jun 2022 16:06:32 GMT'}
{'version': 'v2', 'created': 'Thu, 14 Jul 2022 02:41:26 GMT'}
{'version': 'v3', 'created': 'Fri, 22 Jul 2022 15:59:21 GMT'}]
|
2022-07-25
|
[array(['Luo', 'Si-Qiang', ''], dtype=object)
array(['Geng', 'Li-Sheng', ''], dtype=object)
array(['Liu', 'Xiang', ''], dtype=object)]
|
3,763 |
1810.10125
|
Christian de Ronde
|
Christian de Ronde, Raimundo Fern\'andez Mouj\'an, C\'esar Massri
|
Taking Mermin's Relational Interpretation of QM Beyond Cabello's and
Seevinck's No-Go Theorems
|
19 pages, 1 photo
| null | null | null |
physics.hist-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we address a deeply interesting debate that took place at the
end of the last millennia between David Mermin, Adan Cabello and Michiel
Seevinck, regarding the meaning of relationalism within quantum theory. In a
series of papers, Mermin proposed an interpretation in which quantum
correlations were considered as elements of physical reality. Unfortunately,
the very young relational proposal by Mermin was too soon tackled by specially
suited no-go theorems designed by Cabello and Seevinck. In this work we attempt
to reconsider Mermin's program from the viewpoint of the Logos Categorical
Approach to QM. Following Mermin's original proposal, we will provide a
redefinition of quantum relation which not only can be understood as a
preexistent element of physical reality but is also capable to escape Cabello's
and Seevinck's no-go-theorems. In order to show explicitly that our notion of
ontological quantum relation is safe from no-go theorems we will derive a
non-contextuality theorem. We end the paper with a discussion regarding the
physical meaning of quantum relationalism.
|
[{'version': 'v1', 'created': 'Tue, 23 Oct 2018 23:13:16 GMT'}]
|
2018-10-25
|
[array(['de Ronde', 'Christian', ''], dtype=object)
array(['Mouján', 'Raimundo Fernández', ''], dtype=object)
array(['Massri', 'César', ''], dtype=object)]
|
3,764 |
2112.09027
|
Anirudh Subramanyam
|
Anirudh Subramanyam and Youngdae Kim and Michel Schanen and
Fran\c{c}ois Pacaud and Mihai Anitescu
|
A Globally Convergent Distributed Jacobi Scheme for Block-Structured
Nonconvex Constrained Optimization Problems
| null | null | null | null |
math.OC
|
http://creativecommons.org/licenses/by/4.0/
|
Motivated by the increasing availability of high-performance parallel
computing, we design a distributed parallel algorithm for linearly-coupled
block-structured nonconvex constrained optimization problems. Our algorithm
performs Jacobi-type proximal updates of the augmented Lagrangian function,
requiring only local solutions of separable block nonlinear programming (NLP)
problems. We provide a cheap and explicitly computable Lyapunov function that
allows us to establish global and local sublinear convergence of our algorithm,
its iteration complexity, as well as simple, practical and theoretically
convergent rules for automatically tuning its parameters. This in contrast to
existing algorithms for nonconvex constrained optimization based on the
alternating direction method of multipliers that rely on at least one of the
following: Gauss-Seidel or sequential updates, global solutions of NLP
problems, non-computable Lyapunov functions, and hand-tuning of parameters.
Numerical experiments showcase its advantages for large-scale problems,
including the multi-period optimization of a 9000-bus AC optimal power flow
test case over 168 time periods, solved on the Summit supercomputer using an
open-source Julia code.
|
[{'version': 'v1', 'created': 'Thu, 16 Dec 2021 17:14:39 GMT'}]
|
2021-12-17
|
[array(['Subramanyam', 'Anirudh', ''], dtype=object)
array(['Kim', 'Youngdae', ''], dtype=object)
array(['Schanen', 'Michel', ''], dtype=object)
array(['Pacaud', 'François', ''], dtype=object)
array(['Anitescu', 'Mihai', ''], dtype=object)]
|
3,765 |
1403.7138
|
Aigen Li
|
Qi Li, S.L. Liang, Aigen Li (University of Missouri)
|
Spectropolarimetric Constraints on the Nature of Interstellar Grains
|
5 pages, 2 figures; accepted for publication in MNRAS Letters
| null |
10.1093/mnrasl/slu021
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
While it is well recognized that interstellar grains are made of amorphous
silicates and some form of carbonaceous materials, it remains debated regarding
what exact chemical and physical form the carbonaceous component takes.
Contemporary grain models assume that the silicate and carbon components are
either physically separated, or they form a core-mantle structure, or they
agglomerate to form porous composites. The core-mantle model posits that the
mantle is made of some sort of aliphatic hydrocarbon materials and is
responsible for the 3.4 micrometer absorption feature ubiquitously seen in the
diffuse interstellar medium (ISM) of the Milky Way and external galaxies. This
model is challenged by the nondetection of polarization in the 3.4 micrometer
absorption feature as the 9.7 micrometer silicate feature is observed to be
polarized.
To alleviate this challenge, we calculate the degree of polarization of the
3.4 micrometer feature for spheroidal silicate dust coated by a layer of
spherical aliphatic hydrocarbon. It is found that the 3.4 micrometer feature
polarization still exceeds the observational upper limit, even though spherical
aliphatic hydrocarbon mantles are expected to cause much less polarization than
nonspherical (e.g., spheroidal) mantles.
We have also shown that the composite grain model which consists of amorphous
silicate, aliphatic hydrocarbon, and vacuum also predicts the 3.4 micrometer
feature polarization to well exceed what is observed. These results support the
earlier arguments that the aliphatic hydrocarbon component is physically
separated from the silicate component unless the 3.4 micrometer absorption
feature is just a minor carbon sink in the ISM.
|
[{'version': 'v1', 'created': 'Thu, 27 Mar 2014 17:25:40 GMT'}]
|
2015-06-19
|
[array(['Li', 'Qi', '', 'University of Missouri'], dtype=object)
array(['Liang', 'S. L.', '', 'University of Missouri'], dtype=object)
array(['Li', 'Aigen', '', 'University of Missouri'], dtype=object)]
|
3,766 |
2212.08713
|
Couvreur Alain
|
Alain Couvreur
|
Improved decoding of symmetric rank metric errors
| null | null | null | null |
cs.IT math.IT
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the decoding of rank metric codes assuming the error matrix is
symmetric. We prove two results. First, for rates $<1/2$ there exists a broad
family of rank metric codes for which any symmetric error pattern, even of
maximal rank can be corrected. Moreover, the corresponding family of decodable
codes includes Gabidulin codes of rate $<1/2$. Second, for rates $>1/2$, we
propose a decoder for Gabidulin codes correcting symmetric errors of rank up to
$n-k$. The two mentioned decoders are deterministic and worst case.
|
[{'version': 'v1', 'created': 'Fri, 16 Dec 2022 21:15:07 GMT'}
{'version': 'v2', 'created': 'Wed, 22 Mar 2023 14:20:47 GMT'}]
|
2023-03-23
|
[array(['Couvreur', 'Alain', ''], dtype=object)]
|
3,767 |
hep-ex/9905015
|
Michael B. Woods
|
M. Woods
|
Electroweak Results from the SLD Experiment
|
9 pages, 7 figures
| null | null |
SLAC-PUB-8143
|
hep-ex
| null |
We present an overview of the electroweak physics program of the SLD
experiment at the Stanford Linear Accelerator Center (SLAC). A data sample of
550K Z0 decays has been collected. This experiment utilizes a highly polarized
electron beam, a small interaction volume, and a very precise pixel vertex
detector. We present a preliminary result for the weak mixing angle,
sin2(thetaw)=0.23110 +- 0.00029. We also present a preliminary result for the
parity violating parameter, A_b = 0.898 +- 0.029. These measurements are used
to test for physics beyond the Standard Model.
|
[{'version': 'v1', 'created': 'Mon, 10 May 1999 17:23:02 GMT'}]
|
2007-05-23
|
[array(['Woods', 'M.', ''], dtype=object)]
|
3,768 |
1210.5134
|
Anisur Rahaman
|
Anisur Rahaman
|
Unparticle in (1+1) dimension with one loop correction
|
8 pages latex, No figure, To appear in Mod. Phys. Lett. A
|
Mod.Phys.Lett. A29 (2014) 14, 1450072
|
10.1142/S0217732314500722
| null |
hep-th hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The possibility of the presence of unparticle has been discussed recently
adding a mass like term for gauge field with the Vector Schwinger model at the
classical level \cite{GEOR1}. A one loop correction due to bosonization is
taken into account and investigation is carried over to study the effect of it
in connection with the unparticle scenario. It has been found that mass of the
gauge boson acquires a generalized expression with the bare coupling constant
and the parameters involved in the masslike terms added at the classical level
term as well the terms entered in the model during the one loop correction
needed for bosonization. So the physical mass viz., unparticle scale gets a new
definition. The fermionic propagator is calculated which also agrees with the
generalized mass term. A novel restoration of the lost gauge invariance
reappears when the ambiguity parameter that entered into the effective action
within the one loop correction acquires a specific expression with the bare
coupling constant and the parameter involved in the masslike term of the gauge
field added at the classical level.
|
[{'version': 'v1', 'created': 'Thu, 18 Oct 2012 14:14:00 GMT'}
{'version': 'v2', 'created': 'Mon, 21 Apr 2014 14:45:50 GMT'}]
|
2014-05-14
|
[array(['Rahaman', 'Anisur', ''], dtype=object)]
|
3,769 |
2007.00209
|
Bipan Hazarika
|
Antonio Boccuto, Bipan Hazarika and Hemanta Kalita
|
Kuelbs-Steadman spaces for Banach space-valued measures
|
12 pages
|
Mathematics, 2020, 8(6), 1005
|
10.3390/math8061005
| null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce Kuelbs-Steadman-type spaces for real-valued functions, with
respect to countably additive measures, taking values in Banach spaces. We
investigate their main properties and embeddings in $L^p$-type spaces,
considering both the norm associated to norm convergence of the involved
integrals and that related to weak convergence of the integrals.
|
[{'version': 'v1', 'created': 'Wed, 1 Jul 2020 03:47:22 GMT'}
{'version': 'v2', 'created': 'Fri, 3 Jul 2020 12:52:17 GMT'}]
|
2020-07-06
|
[array(['Boccuto', 'Antonio', ''], dtype=object)
array(['Hazarika', 'Bipan', ''], dtype=object)
array(['Kalita', 'Hemanta', ''], dtype=object)]
|
3,770 |
physics/9812026
|
Valerio Lucarini
|
F. Bassani and V. Lucarini
|
General Properties of Optical Harmonic Generation from a simple
Oscillator Model
|
12 pages, no figures
|
IL Nuovo Cimento D Vol. 20, No. 7-8, Jul-Aug 1998
|
10.1007/BF03185520
| null |
physics.optics physics.atom-ph
| null |
The nonlinear oscillator model allows a basic understanding of all nonlinear
processes and can be adopted to analyse optical vibrational modes and
electronic transition in molecules and crystals, in order to derive general
properties of harmonic generation to all orders. In particular, we obtain
Kramers Kroenig relations and sum rules referred to all momenta of the
susceptibility, and Miller's empirical rules to all orders. Since the above
properties only depend on time causality and not on the specific microscopic
model, they can be adopted for the quantum mechanical description, sustituting
in the classical expression the derivatives of the potential with their
expectation values.
|
[{'version': 'v1', 'created': 'Tue, 15 Dec 1998 18:53:03 GMT'}]
|
2015-06-26
|
[array(['Bassani', 'F.', ''], dtype=object)
array(['Lucarini', 'V.', ''], dtype=object)]
|
3,771 |
0903.4135
|
Oluseyi Latunde-Dada
|
Oluseyi Latunde-Dada
|
MC@NLO for the hadronic decay of Higgs bosons in associated production
with vector bosons
| null |
JHEP 0905:112,2009
|
10.1088/1126-6708/2009/05/112
|
LU-TP/09-05, MCnet/09/07 HERWIG/09/02
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article we describe simulations of the hadronic decay of Higgs bosons
produced in association with vector bosons at linear and hadronic colliders. We
use the Monte Carlo at next-to-leading-order MC@NLO matching prescription with
the Herwig++ event generator to predict various spectra of the resulting b
anti-b pairs and compare our results with leading order and matrix element
correction predictions.
|
[{'version': 'v1', 'created': 'Tue, 24 Mar 2009 17:04:06 GMT'}]
|
2011-01-27
|
[array(['Latunde-Dada', 'Oluseyi', ''], dtype=object)]
|
3,772 |
2006.15731
|
Pavel Tokmakov
|
Pavel Tokmakov, Martial Hebert, Cordelia Schmid
|
Unsupervised Learning of Video Representations via Dense Trajectory
Clustering
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper addresses the task of unsupervised learning of representations for
action recognition in videos. Previous works proposed to utilize future
prediction, or other domain-specific objectives to train a network, but
achieved only limited success. In contrast, in the relevant field of image
representation learning, simpler, discrimination-based methods have recently
bridged the gap to fully-supervised performance. We first propose to adapt two
top performing objectives in this class - instance recognition and local
aggregation, to the video domain. In particular, the latter approach iterates
between clustering the videos in the feature space of a network and updating it
to respect the cluster with a non-parametric classification loss. We observe
promising performance, but qualitative analysis shows that the learned
representations fail to capture motion patterns, grouping the videos based on
appearance. To mitigate this issue, we turn to the heuristic-based IDT
descriptors, that were manually designed to encode motion patterns in videos.
We form the clusters in the IDT space, using these descriptors as a an
unsupervised prior in the iterative local aggregation algorithm. Our
experiments demonstrates that this approach outperform prior work on UCF101 and
HMDB51 action recognition benchmarks. We also qualitatively analyze the learned
representations and show that they successfully capture video dynamics.
|
[{'version': 'v1', 'created': 'Sun, 28 Jun 2020 22:23:03 GMT'}]
|
2020-06-30
|
[array(['Tokmakov', 'Pavel', ''], dtype=object)
array(['Hebert', 'Martial', ''], dtype=object)
array(['Schmid', 'Cordelia', ''], dtype=object)]
|
3,773 |
1708.08279
|
Ben Craps
|
A. Bagrov, B. Craps, F. Galli, V. Ker\"anen, E. Keski-Vakkuri, J.
Zaanen
|
Holography and thermalization in optical pump-probe spectroscopy
|
7 pages, 4 figures; v2: broader context emphasized, references added
|
Phys. Rev. D 97, 086005 (2018)
|
10.1103/PhysRevD.97.086005
| null |
hep-th cond-mat.str-el cond-mat.supr-con quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using holography, we model experiments in which a 2+1D strange metal is
pumped by a laser pulse into a highly excited state, after which the time
evolution of the optical conductivity is probed. We consider a finite-density
state with mildly broken translation invariance and excite it by oscillating
electric field pulses. At zero density, the optical conductivity would assume
its thermalized value immediately after the pumping has ended. At finite
density, pulses with significant DC components give rise to slow exponential
relaxation, governed by a vector quasinormal mode. In contrast, for
high-frequency pulses the amplitude of the quasinormal mode is strongly
suppressed, so that the optical conductivity assumes its thermalized value
effectively instantaneously. This surprising prediction may provide a stimulus
for taking up the challenge to realize these experiments in the laboratory.
Such experiments would test a crucial open question faced by applied
holography: Are its predictions artefacts of the large $N$ limit or do they
enjoy sufficient UV independence to hold at least qualitatively in real-world
systems?
|
[{'version': 'v1', 'created': 'Mon, 28 Aug 2017 11:47:39 GMT'}
{'version': 'v2', 'created': 'Tue, 3 Apr 2018 14:28:24 GMT'}]
|
2018-04-18
|
[array(['Bagrov', 'A.', ''], dtype=object)
array(['Craps', 'B.', ''], dtype=object)
array(['Galli', 'F.', ''], dtype=object)
array(['Keränen', 'V.', ''], dtype=object)
array(['Keski-Vakkuri', 'E.', ''], dtype=object)
array(['Zaanen', 'J.', ''], dtype=object)]
|
3,774 |
1605.06997
|
Binghai Yan
|
Jayita Nayak, Shu-Chun Wu, Nitesh Kumar, Chandra Shekhar, Sanjay
Singh, J\"org Fink, Emile E. D. Rienks, Gerhard H. Fecher, Stuart S. P.
Parkin, Binghai Yan and Claudia Felser
|
Multiple Dirac cones at the surface of the topological metal LaBi
|
18 pages including the supplementary information, 4+4 figures
| null |
10.1038/ncomms13942
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The rare-earth monopnictide LaBi exhibits exotic magneto-transport properties
including an extremely large and anisotropic magnetoresistance. Experimental
evidence for topological surface states is still missing although band
inversions have been postulated to induce a topological phase in LaBi. By
employing angle-resolved photoemission spectroscopy (ARPES) in conjunction with
$ab~initio$ calculations, we have revealed the existence of surface states of
LaBi through the observation of three Dirac cones: two coexist at the corners
and one appears at the center of the Brillouin zone. The odd number of surface
Dirac cones is a direct consequence of the odd number of band inversions in the
bulk band structure, thereby proving that LaBi is a topological, compensated
semi-metal, which is equivalent to a time-reversal invariant topological
insulator. Our findings provide insight into the topological surface states of
LaBi's semi-metallicity and related magneto-transport properties.
|
[{'version': 'v1', 'created': 'Mon, 23 May 2016 12:39:46 GMT'}
{'version': 'v2', 'created': 'Fri, 12 Aug 2016 10:44:01 GMT'}]
|
2017-02-01
|
[array(['Nayak', 'Jayita', ''], dtype=object)
array(['Wu', 'Shu-Chun', ''], dtype=object)
array(['Kumar', 'Nitesh', ''], dtype=object)
array(['Shekhar', 'Chandra', ''], dtype=object)
array(['Singh', 'Sanjay', ''], dtype=object)
array(['Fink', 'Jörg', ''], dtype=object)
array(['Rienks', 'Emile E. D.', ''], dtype=object)
array(['Fecher', 'Gerhard H.', ''], dtype=object)
array(['Parkin', 'Stuart S. P.', ''], dtype=object)
array(['Yan', 'Binghai', ''], dtype=object)
array(['Felser', 'Claudia', ''], dtype=object)]
|
3,775 |
0910.1411
|
Anupam Saikia
|
Anupam Saikia
|
On units generated by Euler systems
|
20 pages, conference talk given in 2006 at HRI, Allahabad, India and
published in Number Theory and Applications, Proceedings of the International
Conferences on Number Theory and Cryptography
| null | null | null |
math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of cyclotomic fields, it is still unknown whether there exist
Euler systems other than the ones derived from cyclotomic units. Nevertheless,
we first give an exposition on how norm-compatible units are generated by any
Euler system, following work of Coates. Then we prove that the units obtained
from Euler systems and the cyclotomic units generate the same
$\mathbb{Z}_{p}$-module for any odd prime $p$. The techniques adopted for the
Iwasawa theoretic proof in latter part of this article originated in Rubin's
work on main conjectures of Iwasawa theory.
|
[{'version': 'v1', 'created': 'Thu, 8 Oct 2009 06:09:03 GMT'}]
|
2009-10-09
|
[array(['Saikia', 'Anupam', ''], dtype=object)]
|
3,776 |
astro-ph/0011010
|
Esteban Roulet
|
Julian Candia, Luis N. Epele and Esteban Roulet
|
Cosmic ray photodisintegration and the knee of the spectrum
|
17 pp. Comments and references added. To appear in Astroparticle
Physics
|
Astropart.Phys. 17 (2002) 23-33
|
10.1016/S0927-6505(01)00131-1
| null |
astro-ph hep-ph
| null |
We explore in some detail the scenario proposed to explain the observed knee
of the cosmic ray (CR) spectrum as due to the effects of photodisintegration of
the CR nuclei by interactions with optical and soft UV photons in the source
region. We show that the photon column densities needed to explain the
experimental data are significantly lower than those obtained in previous
estimations which neglected multinucleon emission in the photodisintegration
process. We also treat more accurately the photodisintegration thresholds, we
discuss the effects of photopion production processes and the neutron escape
mechanism, identifying the physical processes responsible for the qualitative
features of the results. This scenario would require the CR nuclei to traverse
column densities of $\sim 5 \times 10^{27}- 2 \times 10^{28}$ eV/cm$^2$ after
being accelerated in order to reproduce the observed knee, and predicts that
the CR composition should become lighter above $\sim 10^{16}$ eV.
|
[{'version': 'v1', 'created': 'Wed, 1 Nov 2000 18:53:49 GMT'}
{'version': 'v2', 'created': 'Tue, 26 Jun 2001 12:21:53 GMT'}]
|
2009-10-31
|
[array(['Candia', 'Julian', ''], dtype=object)
array(['Epele', 'Luis N.', ''], dtype=object)
array(['Roulet', 'Esteban', ''], dtype=object)]
|
3,777 |
0706.0447
|
Francois Rodier
|
Fran\c{c}ois Rodier (IML), Eric F\'erard (GAATI)
|
Non lin\'earit\'e des fonctions bool\'eennes donn\'ees par des traces de
polyn\^omes de degr\'e binaire 3
| null | null | null | null |
math.NT cs.CR cs.DM math.AG
| null |
Nous \'etudions la non lin\'earit\'e des fonctions d\'efinies sur F_{2^m}
o\`u $m$ est un entier impair, associ\'ees aux polyn\^omes de degr\'e 7 ou \`a
des polyn\^omes plus g\'en\'eraux.
-----
We study the nonlinearity of the functions defined on F_{2^m} where $m$ is an
odd integer, associated to the polynomials of degree 7 or more general
polynomials.
|
[{'version': 'v1', 'created': 'Mon, 4 Jun 2007 14:37:29 GMT'}]
|
2007-06-05
|
[array(['Rodier', 'François', '', 'IML'], dtype=object)
array(['Férard', 'Eric', '', 'GAATI'], dtype=object)]
|
3,778 |
1210.2389
|
Fred Brackx
|
Fred Brackx, Hendrik De Bie and Hennie De Schepper
|
Distributional Boundary Values of Harmonic Potentials in Euclidean
Half-space as Fundamental Solutions of Convolution Operators in Clifford
Analysis
|
arXiv admin note: text overlap with arXiv:1210.2044
| null | null | null |
math.CA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the framework of Clifford analysis, a chain of harmonic and monogenic
potentials in the upper half of Euclidean space $\mR^{m+1}$ was recently
constructed, including a higher dimensional analogue of the logarithmic
function in the complex plane. In this construction the distributional limits
of these potentials at the boundary $\mR^{m}$ are crucial. The remarkable
relationship between these distributional boundary values and four basic
pseudodifferential operators linked with the Dirac and Laplace operators is
studied.
|
[{'version': 'v1', 'created': 'Sun, 7 Oct 2012 11:43:27 GMT'}]
|
2012-10-10
|
[array(['Brackx', 'Fred', ''], dtype=object)
array(['De Bie', 'Hendrik', ''], dtype=object)
array(['De Schepper', 'Hennie', ''], dtype=object)]
|
3,779 |
1708.02007
|
Bartlomiej Szafran
|
E. Wach, B. Szafran
|
Pauli blockade microscopy of quantum dots
|
8 pages
| null | null | null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a spin-sensitive scanning probe microscopy experiment on double
quantum dots in Pauli blockade conditions. Electric spin resonance is induced
by an AC voltage applied to the scanning gate which induces lifting of the
Pauli blockade of the current. The stationary Hamiltonian eigenstates are used
as a basis for description of the spin dynamics with the AC potential of the
probe. For the two-electron system we evaluate the transitions rates from
triplet $\mathrm{T}_+$ state to singlet $\mathrm{S}$ or triplet $\mathrm{T}_0$
states, i.e. to conditions in which the Pauli blockade of the current is
lifted. The rates of the spin-flip transitions are consistent with the
transition matrix elements and strongly dependent on the tip position. Probing
the spin densities and identification of the final transition state are
discussed.
|
[{'version': 'v1', 'created': 'Mon, 7 Aug 2017 06:54:30 GMT'}]
|
2017-08-08
|
[array(['Wach', 'E.', ''], dtype=object)
array(['Szafran', 'B.', ''], dtype=object)]
|
3,780 |
1812.05119
|
Vincent Bourrier Dr
|
V.Bourrier, A.Lecavelier des Etangs, D.Ehrenreich, J.Sanz-Forcada,
R.Allart, G.E.Ballester, L.A.Buchhave, O.Cohen, D.Deming, T.M.Evans, A.Garcia
Munoz, G.W.Henry, T.Kataria, P.Lavvas, N.Lewis, M.Lopez-Morales, M.Marley,
D.K.Sing, H.R.Wakeford
|
Hubble PanCET: An extended upper atmosphere of neutral hydrogen around
the warm Neptune GJ 3470 b
|
14 pages, 12 figures, published in A&A
|
A&A 620, A147 (2018)
|
10.1051/0004-6361/201833675
| null |
astro-ph.EP astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
GJ 3470b is a warm Neptune transiting an M-dwarf star at the edge of the
evaporation desert. It offers the possibility of investigating how low-mass,
close-in exoplanets evolve under the irradiation from their host stars. We
observed three transits of GJ 3470b in the Lyman-alpha line with the Hubble
Space Telescope (HST) as part of the Panchromatic Comparative Exoplanet
Treasury (PanCET) program. Absorption signatures are detected with similar
properties in all three independent epochs, with absorption depths of 35+-7% in
the blue wing of the line, and 23+-5% in the red wing. The repeatability of
these signatures, their phasing with the planet transit, and the radial
velocity of the absorbing gas allow us to conclude that there is an extended
upper atmosphere of neutral hydrogen around GJ 3470 b. We determine from our
observations the stellar radiation pressure and XUV irradiation from GJ 3470
and use them to perform numerical simulations of the upper atmosphere of GJ
3470b with the EVaporating Exoplanets (EVE) code. The unusual redshifted
signature can be explained by the damping wings of dense layers of neutral
hydrogen that extend beyond the Roche lobe and are elongated in the direction
of the planet motion. This structure could correspond to a shocked layer of
planetary material formed by the collision of the expanding thermosphere with
the wind of the star. The blueshifted signature is well explained by neutral
hydrogen atoms escaping at rates of about 1e10 g s-1 that are blown away from
the star by its strong radiation pressure and are quickly photoionized,
resulting in a smaller exosphere than that of the warm Neptune GJ 436b. The
stronger escape from GJ 3470b, however, may have led to the loss of about 4-35%
of its current mass over its 2 Gyr lifetime.
|
[{'version': 'v1', 'created': 'Wed, 12 Dec 2018 19:01:00 GMT'}]
|
2018-12-14
|
[array(['Bourrier', 'V.', ''], dtype=object)
array(['Etangs', 'A. Lecavelier des', ''], dtype=object)
array(['Ehrenreich', 'D.', ''], dtype=object)
array(['Sanz-Forcada', 'J.', ''], dtype=object)
array(['Allart', 'R.', ''], dtype=object)
array(['Ballester', 'G. E.', ''], dtype=object)
array(['Buchhave', 'L. A.', ''], dtype=object)
array(['Cohen', 'O.', ''], dtype=object)
array(['Deming', 'D.', ''], dtype=object)
array(['Evans', 'T. M.', ''], dtype=object)
array(['Munoz', 'A. Garcia', ''], dtype=object)
array(['Henry', 'G. W.', ''], dtype=object)
array(['Kataria', 'T.', ''], dtype=object)
array(['Lavvas', 'P.', ''], dtype=object)
array(['Lewis', 'N.', ''], dtype=object)
array(['Lopez-Morales', 'M.', ''], dtype=object)
array(['Marley', 'M.', ''], dtype=object)
array(['Sing', 'D. K.', ''], dtype=object)
array(['Wakeford', 'H. R.', ''], dtype=object)]
|
3,781 |
hep-th/0305144
|
Kazuo Fujikawa
|
Kazuo Fujikawa (Dept. of Phys., Univ. of Tokyo), Peter van
Nieuwenhuizen (YITP, SUNY at Stony Brook)
|
Topological anomalies from the path integral measure in superspace
|
36 pages
|
Annals Phys. 308 (2003) 78-114
|
10.1016/S0003-4916(03)00133-7
|
UT-03-07, YITP-SB-03-11
|
hep-th
| null |
A fully quantum version of the Witten-Olive analysis of the central charge in
the N=1 Wess-Zumino model in $d=2$ with a kink solution is presented by using
path integrals in superspace. We regulate the Jacobians with heat kernels in
superspace, and obtain all superconformal anomalies as one Jacobian factor. The
conserved quantum currents differ from the Noether currents by terms
proportional to field equations, and these terms contribute to the anomalies.
We identify the particular variation of the superfield which produces the
central charge current and its anomaly; it is the variation of the auxiliary
field. The quantum supersymmetry algebra which includes the contributions of
superconformal anomalies is derived by using the Bjorken-Johnson-Low method
instead of semi-classical Dirac brackets. We confirm earlier results that the
BPS bound remains saturated at the quantum level due to equal anomalies in the
energy and central charge.
|
[{'version': 'v1', 'created': 'Fri, 16 May 2003 14:31:28 GMT'}
{'version': 'v2', 'created': 'Sat, 17 May 2003 19:55:55 GMT'}]
|
2009-11-10
|
[array(['Fujikawa', 'Kazuo', '', 'Dept. of Phys., Univ. of Tokyo'],
dtype=object)
array(['van Nieuwenhuizen', 'Peter', '', 'YITP, SUNY at Stony Brook'],
dtype=object) ]
|
3,782 |
gr-qc/0309050
|
Sawa Manoff
|
Sawa Manoff
|
Propagation of signals in spaces with affine connections and metrics as
models of space-time
|
65 pages, LaTex
|
Fiz.Elem.Chast.Atom.Yadra 35 (2004) 1185-1258; Phys.Part.Nucl. 35
(2004) 633-674
| null | null |
gr-qc
| null |
The propagation of signals in space-time is considered on the basis of the
notion of null (isotropic) vector field in spaces with affine connections and
metrics as models of space or of space-time. The Doppler effect is generalized
for these types of spaces. The notions of aberration, standard (longitudinal)
Doppler effect, and transversal Doppler effect are considered. On their
grounds, the Hubble effect appears as Doppler effect with explicit forms of the
centrifugal (centripetal) and Coriolis velocities and accelerations. Doppler
effect, Hubble effect, and aberration could be used in mechanics of continuous
media and in other classical field theories in the same way as the standard
Doppler effect is used in classical and relativistic mechanics.
|
[{'version': 'v1', 'created': 'Tue, 9 Sep 2003 09:50:29 GMT'}]
|
2007-05-23
|
[array(['Manoff', 'Sawa', ''], dtype=object)]
|
3,783 |
1110.2831
|
Dacheng Yao
|
Jim Dai, Dacheng Yao
|
Optimal Control of Brownian Inventory Models with Convex Holding Cost:
Average Cost Case
| null |
Stochastic Systems 3 (2013) 442-499
|
10.1214/11-SSY041
|
SSY2013a
|
math.OC math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider an inventory system in which inventory level fluctuates as a
Brownian motion in the absence of control. The inventory continuously
accumulates cost at a rate that is a general convex function of the inventory
level, which can be negative when there is a backlog. At any time, the
inventory level can be adjusted by a positive or negative amount, which incurs
a fixed cost and a proportional cost. The challenge is to find an adjustment
policy that balances the holding cost and adjustment cost to minimize the
long-run average cost. When both upward and downward fixed costs are positive,
our model is an impulse control problem. When both fixed costs are zero, our
model is a singular or instantaneous control problem. For the impulse control
problem, we prove that a four-parameter control band policy is optimal among
all feasible policies. For the singular control problem, we prove that a
two-parameter control band policy is optimal.
We use a lower-bound approach, widely known as "the verification theorem", to
prove the optimality of a control band policy for both the impulse and singular
control problems. Our major contribution is to prove the existence of a
"smooth" solution to the free boundary problem under some mild assumptions on
the holding cost function. The existence proof leads naturally to numerical
algorithms to compute the optimal control band parameters. We demonstrate that
the lower-bound approach also works for Brownian inventory model in which no
inventory backlog is allowed. In a companion paper, we will show how the
lower-bound approach can be adapted to study a Brownian inventory model under a
discounted cost criterion.
|
[{'version': 'v1', 'created': 'Thu, 13 Oct 2011 03:03:41 GMT'}
{'version': 'v2', 'created': 'Sun, 16 Oct 2011 01:41:06 GMT'}]
|
2014-01-21
|
[array(['Dai', 'Jim', ''], dtype=object)
array(['Yao', 'Dacheng', ''], dtype=object)]
|
3,784 |
2206.01538
|
Roland L\"owe
|
Rocco Palmitessa, Morten Grum, Allan Peter Engsig-Karup, Roland L\"owe
|
Accelerating hydrodynamic simulations of urban drainage systems with
physics-guided machine learning
| null |
Water Research 223 (2022) 118972
|
10.1016/j.watres.2022.118972
| null |
cs.LG cs.CE
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We propose and demonstrate a new approach for fast and accurate surrogate
modelling of urban drainage system hydraulics based on physics-guided machine
learning. The surrogates are trained against a limited set of simulation
results from a hydrodynamic (HiFi) model. Our approach reduces simulation times
by one to two orders of magnitude compared to a HiFi model. It is thus slower
than e.g. conceptual hydrological models, but it enables simulations of water
levels, flows and surcharges in all nodes and links of a drainage network and
thus largely preserves the level of detail provided by HiFi models. Comparing
time series simulated by the surrogate and the HiFi model, R2 values in the
order of 0.9 are achieved. Surrogate training times are currently in the order
of one hour. However, they can likely be reduced through the application of
transfer learning and graph neural networks. Our surrogate approach will be
useful for interactive workshops in initial design phases of urban drainage
systems, as well as for real time applications. In addition, our model
formulation is generic and future research should investigate its application
for simulating other water systems.
|
[{'version': 'v1', 'created': 'Tue, 24 May 2022 19:44:46 GMT'}
{'version': 'v2', 'created': 'Mon, 15 Aug 2022 11:41:51 GMT'}]
|
2022-11-15
|
[array(['Palmitessa', 'Rocco', ''], dtype=object)
array(['Grum', 'Morten', ''], dtype=object)
array(['Engsig-Karup', 'Allan Peter', ''], dtype=object)
array(['Löwe', 'Roland', ''], dtype=object)]
|
3,785 |
1804.02067
|
Israel Perez
|
Israel Perez, Victor Sosa, Fidel Gamboa Perera, Jose Trinidad Elizalde
Galindo, Jose Luis Enriquez-Carrejo, Pierre Giovanni Mani Gonzalez
|
Effect of Ion Bombardment on the Chemical Properties of Crystalline
Tantalum Pentoxide Films
|
12 pages, 8 figures
|
Vacuum, 165, 274-282, (2019)
|
10.1016/j.vacuum.2019.04.037
| null |
cond-mat.mtrl-sci cond-mat.mes-hall cond-mat.supr-con
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effect of argon ion bombardment on the chemical properties of crystalline
Ta$_2$O$_5$ films grown on Si(100) substrates by radio frequency magnetron
sputtering was investigated by X-ray photoelectron spectroscopy. All samples
were irradiated for several time intervals [(0.5, 3, 6, 9) min] and the Ta $4f$
and O $1s$ core levels were measured each time. Upon analysis at the surface of
the films, we observe the Ta $4f$ spectrum characteristic of Ta$_2$O$_5$.
Irradiated samples exhibit the formation of Ta suboxides with oxidation states
Ta$^{1+}$, Ta$^{2+}$, Ta$^{3+}$, Ta$^{4+}$, and Ta$^{5+}$. Exposing the films,
after ion bombardment, to ambient for some days stimulates the amorphous phase
of Ta$_2$O$_5$ at the surface suggesting that the suboxides of Ta are unstable.
Using a sputtering simulation we discuss that these suboxides are largely
generated during ion bombardment that greatly reduces the oxygen to tantalum
ratio as the irradiation time increases. The computer simulation indicates that
this is due to the high sputtering yield of oxygen.
|
[{'version': 'v1', 'created': 'Thu, 5 Apr 2018 21:47:12 GMT'}
{'version': 'v2', 'created': 'Fri, 3 May 2019 18:30:00 GMT'}]
|
2019-05-07
|
[array(['Perez', 'Israel', ''], dtype=object)
array(['Sosa', 'Victor', ''], dtype=object)
array(['Perera', 'Fidel Gamboa', ''], dtype=object)
array(['Galindo', 'Jose Trinidad Elizalde', ''], dtype=object)
array(['Enriquez-Carrejo', 'Jose Luis', ''], dtype=object)
array(['Gonzalez', 'Pierre Giovanni Mani', ''], dtype=object)]
|
3,786 |
cond-mat/9511103
|
Ivar Zapata
|
I.Zapata and F. Sols
|
Supercurrent flow through an effective double barrier structure
|
20 pages, RevTex, to appear in Phys. Rev. B, 6 figures on request at
[email protected]
| null |
10.1103/PhysRevB.53.6693
| null |
cond-mat
| null |
Supercurrent flow is studied in a structure that in the Ginzburg-Landau
regime can be described in terms of an effective double barrier potential. In
the limit of strongly reflecting barriers, the passage of Cooper pairs through
such a structure may be viewed as a realization of resonant tunneling with a
rigid wave function. For interbarrier distances smaller than $d_0=\pi\xi(T)$ no
current-carrying solutions exist. For distances between $d_0$ and $2d_0$, four
solutions exist. The two symmetric solutions obey a current-phase relation of
$\sin(\Delta\varphi/2)$, while the two asymmetric solutions satisfy
$\Delta\varphi=\pi$ for all allowed values of the current. As the distance
exceeds $nd_0$, a new group of four solutions appears, each contaning $(n-1)$
soliton-type oscillations between the barriers. We prove the inexistence of a
continuous crossover between the physical solutions of the nonlinear
Ginzburg-Landau equation and those of the corresponding linearized
Schr\"odinger equation. We also show that under certain conditions a repulsive
delta function barrier may quantitatively describe a SNS structure. We are thus
able to predict that the critical current of a SNSNS structure vanishes as
$\sqrt{T'_c-T}$, where $T'_c$ is lower than the bulk critical temperature.
|
[{'version': 'v1', 'created': 'Tue, 21 Nov 1995 15:37:25 GMT'}]
|
2009-10-28
|
[array(['Zapata', 'I.', ''], dtype=object)
array(['Sols', 'F.', ''], dtype=object)]
|
3,787 |
1502.05487
|
Raik Niemann M.Sc.
|
Raik Niemann, Udo Pfingst and Richard G\"obel
|
Performance Evaluation of netfilter: A Study on the Performance Loss
When Using netfilter as a Firewall
|
7 pages, 7 figures, 1 table
| null | null | null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Since GNU/Linux became a popular operating system on computer network
routers, its packet routing mechanisms attracted more interest. This does not
only concern 'big' Linux servers acting as a router but more and more small and
medium network access devices, such as DSL or cable access devices.
Although there are a lot of documents dealing with high performance routing
with GNU/Linux, only a few offer experimental results to prove the given
advices. This study evaluates the throughput performance of Linux' routing
subsystem netfilter under various conditions like different data transport
protocols in combination with different IP address families and transmission
strategies. Those conditions were evaluated with two different types of
netfilter rules for a high number in the rule tables. In addition to this, our
experiments allowed us to evaluate two prominent client connection handling
techniques (threads and the epoll() facility).
The evaluation of the 1.260 different combinations of our test parameters
shows a nearly linear but small throughput loss with the number of rules which
is independant from the transport protocol and framesize. However, this
evaluation identifies another issue concerning the throughput loss when it
comes to the address family, i.e. IPv4 and IPv6.
|
[{'version': 'v1', 'created': 'Thu, 19 Feb 2015 07:52:30 GMT'}]
|
2015-02-20
|
[array(['Niemann', 'Raik', ''], dtype=object)
array(['Pfingst', 'Udo', ''], dtype=object)
array(['Göbel', 'Richard', ''], dtype=object)]
|
3,788 |
1008.0125
|
Alistair Sinclair
|
Fabio Martinelli and Alistair Sinclair
|
Mixing Time for the Solid-on-Solid Model
|
A preliminary version of this paper appeared in Proceedings of the
41st ACM Symposium on Theory of Computer Science (STOC), 2009, pages 571-580
| null | null | null |
math-ph cs.DS math.MP math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the mixing time of a natural local Markov chain (the Glauber
dynamics) on configurations of the solid-on-solid model of statistical physics.
This model has been proposed, among other things, as an idealization of the
behavior of contours in the Ising model at low temperatures. Our main result is
an upper bound on the mixing time of $O~(n^{3.5})$, which is tight within a
factor of $O~(sqrt{n})$. (The notation O~ hides factors that are logarithmic in
n.) The proof, which in addition gives some insight into the actual evolution
of the contours, requires the introduction of a number of novel analytical
techniques that we conjecture will have other applications.
|
[{'version': 'v1', 'created': 'Sat, 31 Jul 2010 21:46:11 GMT'}]
|
2010-08-03
|
[array(['Martinelli', 'Fabio', ''], dtype=object)
array(['Sinclair', 'Alistair', ''], dtype=object)]
|
3,789 |
2009.04239
|
Jon Cockayne
|
Jon Cockayne and Andrew B. Duncan
|
Probabilistic Gradients for Fast Calibration of Differential Equation
Models
| null | null | null | null |
math.OC cs.LG cs.NA math.NA stat.CO stat.ME stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Calibration of large-scale differential equation models to observational or
experimental data is a widespread challenge throughout applied sciences and
engineering. A crucial bottleneck in state-of-the art calibration methods is
the calculation of local sensitivities, i.e. derivatives of the loss function
with respect to the estimated parameters, which often necessitates several
numerical solves of the underlying system of partial or ordinary differential
equations. In this paper we present a new probabilistic approach to computing
local sensitivities. The proposed method has several advantages over classical
methods. Firstly, it operates within a constrained computational budget and
provides a probabilistic quantification of uncertainty incurred in the
sensitivities from this constraint. Secondly, information from previous
sensitivity estimates can be recycled in subsequent computations, reducing the
overall computational effort for iterative gradient-based calibration methods.
The methodology presented is applied to two challenging test problems and
compared against classical methods.
|
[{'version': 'v1', 'created': 'Thu, 3 Sep 2020 10:35:09 GMT'}
{'version': 'v2', 'created': 'Mon, 22 Feb 2021 08:08:35 GMT'}]
|
2021-02-23
|
[array(['Cockayne', 'Jon', ''], dtype=object)
array(['Duncan', 'Andrew B.', ''], dtype=object)]
|
3,790 |
hep-th/0509052
|
Nikolaos Prezas
|
Gianguido Dall'Agata and Nikolaos Prezas
|
Scherk-Schwarz reduction of M-theory on G2-manifolds with fluxes
|
43 pages, Latex; v3 typos corrected, one reference added, JHEP
version
|
JHEP 0510:103,2005
|
10.1088/1126-6708/2005/10/103
| null |
hep-th
| null |
We analyse the 4-dimensional effective supergravity theories obtained from
the Scherk--Schwarz reduction of M-theory on twisted 7-tori in the presence of
4-form fluxes. We implement the appropriate orbifold projection that preserves
a G2-structure on the internal 7-manifold and truncates the effective field
theory to an N=1, D=4 supergravity. We provide a detailed account of the
effective supergravity with explicit expressions for the Kaehler potential and
the superpotential in terms of the fluxes and of the geometrical data of the
internal manifold. Subsequently, we explore the landscape of vacua of M-theory
compactifications on twisted tori, where we emphasize the role of geometric
fluxes and discuss the validity of the bottom-up approach. Finally, by reducing
along isometries of the internal 7-manifold, we obtain superpotentials for the
corresponding type IIA backgrounds.
|
[{'version': 'v1', 'created': 'Wed, 7 Sep 2005 20:17:44 GMT'}
{'version': 'v2', 'created': 'Thu, 29 Sep 2005 14:31:48 GMT'}
{'version': 'v3', 'created': 'Thu, 27 Oct 2005 15:17:40 GMT'}]
|
2010-12-03
|
[array(["Dall'Agata", 'Gianguido', ''], dtype=object)
array(['Prezas', 'Nikolaos', ''], dtype=object)]
|
3,791 |
physics/0205033
|
Rodrigo de Abreu
|
A. Gouveia Oliveira (Direccao Tecnica, Radiodifusao Portuguesa,
Lisboa) and Rodrigo de Abreu (Departamento de Fisica and Centro de
Electrodinamica)
|
Cosmological Principle and Relativity - Part I
|
29 pages and 6 figures
| null | null | null |
physics.gen-ph
| null |
The absence of an identified consequence at solar system scale of the
cosmological space expansion is usually explained considering that space
expansion does not affect local anysotropies in matter distribution. This can
also be explained considering a time dependent scenario compatible with
Relativity Principle, therefore supporting physical laws independent of the
time position of the observer. A theory considering such relativist scenario,
i.e., generalizing Relativity Principle to position, embodies Cosmological
Principle and can be intrinsically able to fit directly both local and cosmic
data. In part I it is presented the general framework of such a theory, called
Local Relativity (LR), and analysed the space-time structure. Special
Relativity space-time is obtained, with no formal conflict with Einstein
analysis, but fully solving apparent paradoxes and conceptual difficulties,
including the simultaneity concept and the long discussed Sagnac effect. In
part II, LR is applied to positional analysis. It is verified the accordance
with solar system measurements and with classic cosmic tests, without dark
matter or dark energy. Two of the new features obtained in part II are the
possibility of a planetary orbital evolution compatible with a null
determination for G variation, supporting a warmer scenario for earth (and
Mars) past climate, and the possibility of an accelerating component in earth
rotation, compatible with the most recent measurements.
|
[{'version': 'v1', 'created': 'Mon, 13 May 2002 18:14:42 GMT'}]
|
2007-05-23
|
[array(['Oliveira', 'A. Gouveia', '',
'Direccao Tecnica, Radiodifusao Portuguesa,\n Lisboa'],
dtype=object)
array(['de Abreu', 'Rodrigo', '',
'Departamento de Fisica and Centro de\n Electrodinamica'],
dtype=object) ]
|
3,792 |
1411.0711
|
M. Javed Akram
|
Muhammad Javed Akram, Farhan Saif
|
Complex dynamics of nano-mechanical membrane in cavity optomechanics
|
7 pages, 6 figures
|
Nonlinear Dyn. 83, 963 (2016)
|
10.1007/s11071-015-2380-y
| null |
quant-ph nlin.CD physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Theoretical analysis of a suspended nanomechanical membrane subject to an
optical driving field in an optomechanical cavity is presented, which is
confirmed through numerical simulations. In the presence of an optical field
between its mirrors, the high-finesse optomechanical resonator acts as an
oscillator driven by a radiation pressure force. The periodic nature of the
radiation pressure force makes the nano-mechanical membrane in the
optomechanical system as a kicked harmonic oscillator. Mathematically the
physical system displays a stochastic web map that helps to understand several
properties of the kicked membrane in classical phase space. We find that our
web map is area preserving and displays quasiperiodic symmetrical structures in
phase space which we express as $q$-fold symmetry. It is shown that under
appropriate control of certain parameters, namely the frequency ratio and the
kicking strength, the dynamics of kicked membrane exhibits chaotic dynamics. We
provide the stability analysis by means of Lyapunov exponent and survival
probability.
|
[{'version': 'v1', 'created': 'Mon, 3 Nov 2014 21:41:51 GMT'}
{'version': 'v2', 'created': 'Fri, 22 Jan 2016 22:01:23 GMT'}]
|
2016-01-26
|
[array(['Akram', 'Muhammad Javed', ''], dtype=object)
array(['Saif', 'Farhan', ''], dtype=object)]
|
3,793 |
1605.02921
|
Purba Bhattacharya
|
Purba Bhattacharya, Sudeb Bhattacharya, Nayana Majumdar, Supratik
Mukhopadhyay, Sandip Sarkar, Paul Colas, David Attie
|
Performance Studies of Bulk Micromegas of Different Design Parameters
|
arXiv admin note: text overlap with arXiv:1605.02896
|
Jour. Instrm. Vol. 9 (2014) C04037
| null | null |
physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The present work involves the comparison of various bulk Micromegas detectors
having different design parameters. Six detectors with amplification gaps of
$64,~128,~192,~220 ~\mu\mathrm{m}$ and mesh hole pitch of $63,~78
~\mu\mathrm{m}$ were tested at room temperature and normal gas pressure. Two
setups were built to evaluate the effect of the variation of the amplification
gap and mesh hole pitch on different detector characteristics. The gain, energy
resolution and electron transmission of these Micromegas detectors were
measured in Argon-Isobutane (90:10) gas mixture while the measurements of the
ion backflow were carried out in P10 gas. These measured characteristics have
been compared in detail to the numerical simulations using the Garfield
framework that combines packages such as neBEM, Magboltz and Heed.
|
[{'version': 'v1', 'created': 'Tue, 10 May 2016 10:12:16 GMT'}]
|
2016-05-12
|
[array(['Bhattacharya', 'Purba', ''], dtype=object)
array(['Bhattacharya', 'Sudeb', ''], dtype=object)
array(['Majumdar', 'Nayana', ''], dtype=object)
array(['Mukhopadhyay', 'Supratik', ''], dtype=object)
array(['Sarkar', 'Sandip', ''], dtype=object)
array(['Colas', 'Paul', ''], dtype=object)
array(['Attie', 'David', ''], dtype=object)]
|
3,794 |
1801.10086
|
Madeleine Bonsma-Fisher
|
Madeleine Bonsma-Fisher, Dominique Soutiere, Sidhartha Goyal
|
How adaptive immunity constrains the composition and fate of large
bacterial populations
|
New version contains revised main text and appendix and new
supporting figures. Results unchanged
| null |
10.1073/pnas.1802887115
| null |
q-bio.PE
|
http://creativecommons.org/licenses/by/4.0/
|
Features of the CRISPR-Cas system, in which bacteria integrate small segments
of phage genome (spacers) into their DNA to neutralize future attacks, suggest
that its effect is not limited to individual bacteria but may control the fate
and structure of whole populations. Emphasizing the population-level impact of
the CRISPR-Cas system, recent experiments show that some bacteria regulate
CRISPR-associated genes via the quorum sensing (QS) pathway. Here we present a
model that shows that from the highly stochastic dynamics of individual spacers
under QS control emerges a rank-abundance distribution of spacers that is
time-invariant, a surprising prediction that we test with dynamic
spacer-tracking data from literature. This distribution depends on the state of
the competing phage-bacteria population, which due to QS-based regulation may
coexist in multiple stable states that vary significantly in their
phage-to-bacterium ratio, a widely used ecological measure to characterize
microbial systems.
|
[{'version': 'v1', 'created': 'Tue, 30 Jan 2018 16:25:44 GMT'}
{'version': 'v2', 'created': 'Tue, 17 Jul 2018 14:06:04 GMT'}]
|
2018-07-30
|
[array(['Bonsma-Fisher', 'Madeleine', ''], dtype=object)
array(['Soutiere', 'Dominique', ''], dtype=object)
array(['Goyal', 'Sidhartha', ''], dtype=object)]
|
3,795 |
1407.4497
|
Hong Yao
|
Shao-Kai Jian, Yi-Fan Jiang, and Hong Yao
|
Emergent space-time supersymmetry in 3D Weyl and 2D Dirac semimetals
|
4.9 pages, 4 figures, published version in Physical Review Letters,
Editors' Suggestion in PRL
|
Phys. Rev. Lett. 114, 237001 (2015)
|
10.1103/PhysRevLett.114.237001
| null |
cond-mat.str-el cond-mat.supr-con hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetry (SUSY) interchanges bosons and fermions but no direct evidences
of it have been revealed in nature yet. In this letter, we observe that
fluctuating pair density waves (PDW) consist of two complex order parameters
which can be superpartners of the unavoidably-doubled Weyl fermions in
three-dimensional lattice models. We construct explicit fermionic lattice
models featuring 3D Weyl fermions and show that PDW is the leading instability
via a continuous phase transition as short-range interactions exceed a critical
value. Using renormalization group, we theoretically show that N=2 space-time
SUSY emerges at the continuous PDW transitions in 3D Weyl semimetals, which we
believe is the first realization of emergent (3+1)D space-time SUSY in
microscopic lattice models. We further discuss possible routes to realize such
lattice models and experimental signatures of emergent SUSY at the PDW
criticality.
|
[{'version': 'v1', 'created': 'Wed, 16 Jul 2014 20:57:44 GMT'}
{'version': 'v2', 'created': 'Thu, 11 Jun 2015 16:57:41 GMT'}]
|
2015-06-12
|
[array(['Jian', 'Shao-Kai', ''], dtype=object)
array(['Jiang', 'Yi-Fan', ''], dtype=object)
array(['Yao', 'Hong', ''], dtype=object)]
|
3,796 |
2111.07860
|
Konrad Kollnig
|
Konrad Kollnig
|
Tracking in apps' privacy policies
|
Technical report from August 2019. Last revised in November 2021
| null | null | null |
cs.CR cs.CY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Data protection law, including the General Data Protection Regulation (GDPR),
usually requires a privacy policy before data can be collected from
individuals. We analysed 15,145 privacy policies from 26,910 mobile apps in May
2019 (about one year after the GDPR came into force), finding that only opening
the policy webpages shares data with third-parties for 48.5% of policies,
potentially violating the GDPR. We compare this data sharing across countries,
payment models (free, in-app-purchases, paid) and platforms (Google Play Store,
Apple App Store). We further contacted 52 developers of apps, which did not
provide a privacy policy, and asked them about their data practices. Despite
being legally required to answer such queries, 12 developers (23%) failed to
respond.
|
[{'version': 'v1', 'created': 'Mon, 15 Nov 2021 16:03:59 GMT'}
{'version': 'v2', 'created': 'Fri, 26 Nov 2021 08:59:17 GMT'}]
|
2021-11-29
|
[array(['Kollnig', 'Konrad', ''], dtype=object)]
|
3,797 |
1105.1761
|
Samuel Wallon
|
I.V.Anikin, A.Besse, D.Yu.Ivanov, B.Pire, L.Szymanowski and S.Wallon
|
A phenomenological study of helicity amplitudes of high energy exclusive
leptoproduction of the rho meson
|
20 pages, 11 figures, published version in PRD
|
Phys.Rev.D84:054004,2011
|
10.1103/PhysRevD.84.054004
|
CPHT RR009.0311, LPT 11-26
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We apply a previously developed scheme to consistently include the twist-3
distribution amplitudes for transversely polarized rho meson in order to
evaluate, in the framework of kT factorization, the helicity amplitudes for
exclusive leptoproduction of a light vector meson, at leading order in alphaS.
We compare our results with high energy experimental data for the ratios of
helicity amplitudes T11/T00 and T01/T00 and get a good description of the data.
|
[{'version': 'v1', 'created': 'Mon, 9 May 2011 19:38:52 GMT'}
{'version': 'v2', 'created': 'Tue, 13 Sep 2011 17:25:44 GMT'}]
|
2011-09-28
|
[array(['Anikin', 'I. V.', ''], dtype=object)
array(['Besse', 'A.', ''], dtype=object)
array(['Ivanov', 'D. Yu.', ''], dtype=object)
array(['Pire', 'B.', ''], dtype=object)
array(['Szymanowski', 'L.', ''], dtype=object)
array(['Wallon', 'S.', ''], dtype=object)]
|
3,798 |
2304.03585
|
Javad Peymanfard
|
Mohammd Hasan Shamgholi, Vahid Saeedi, Javad Peymanfard, Leila
Alhabib, Hossein Zeinali
|
ArmanTTS single-speaker Persian dataset
| null | null | null | null |
cs.CL
|
http://creativecommons.org/licenses/by/4.0/
|
TTS, or text-to-speech, is a complicated process that can be accomplished
through appropriate modeling using deep learning methods. In order to implement
deep learning models, a suitable dataset is required. Since there is a scarce
amount of work done in this field for the Persian language, this paper will
introduce the single speaker dataset: ArmanTTS. We compared the characteristics
of this dataset with those of various prevalent datasets to prove that ArmanTTS
meets the necessary standards for teaching a Persian text-to-speech conversion
model. We also combined the Tacotron 2 and HiFi GAN to design a model that can
receive phonemes as input, with the output being the corresponding speech. 4.0
value of MOS was obtained from real speech, 3.87 value was obtained by the
vocoder prediction and 2.98 value was reached with the synthetic speech
generated by the TTS model.
|
[{'version': 'v1', 'created': 'Fri, 7 Apr 2023 10:52:55 GMT'}]
|
2023-04-10
|
[array(['Shamgholi', 'Mohammd Hasan', ''], dtype=object)
array(['Saeedi', 'Vahid', ''], dtype=object)
array(['Peymanfard', 'Javad', ''], dtype=object)
array(['Alhabib', 'Leila', ''], dtype=object)
array(['Zeinali', 'Hossein', ''], dtype=object)]
|
3,799 |
1611.04536
|
Raquel Molina Ms.
|
R. Molina, D. Guo, B. Hu, A. Alexandru and M. Doring
|
Role of the strange quark in the rho(770) meson
|
11 pages, 9 figures
| null |
10.1051/epjconf/201713705019
| null |
hep-lat hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the GWU lattice group has evaluated high-precision phase-shift data
for $\pi\pi$ scattering in the $I = 1$, $J = 1$ channel. Unitary Chiral
Perturbation Theory describes these data well around the resonance region and
for different pion masses. Moreover, it allows to extrapolate to the physical
point and estimate the effect of the missing $K\bar{K}$ channel in the
two-flavor lattice calculation. The absence of the strange quark in the lattice
data leads to a lower $\rho$ mass, and the analysis with U$\chi$PT shows that
the $K \bar{K}$ channel indeed pushes the $\pi\pi$-scattering phase shift
upward, having a surprisingly large effect on the $\rho$-mass. The inelasticity
is shown to be compatible with the experimental data. The analysis is then
extended to all available two-flavor lattice simulations and similar mass
shifts are observed. Chiral extrapolations of $N_f = 2 + 1$ lattice simulations
for the $\rho(770)$ are also reported.
|
[{'version': 'v1', 'created': 'Mon, 14 Nov 2016 19:23:55 GMT'}]
|
2017-04-05
|
[array(['Molina', 'R.', ''], dtype=object)
array(['Guo', 'D.', ''], dtype=object)
array(['Hu', 'B.', ''], dtype=object)
array(['Alexandru', 'A.', ''], dtype=object)
array(['Doring', 'M.', ''], dtype=object)]
|
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