Unnamed: 0
int64 0
20k
| id
stringlengths 9
16
| submitter
stringlengths 1
50
⌀ | authors
stringlengths 5
15.2k
| title
stringlengths 7
294
| comments
stringlengths 1
682
⌀ | journal-ref
stringlengths 4
256
⌀ | doi
stringlengths 13
133
⌀ | report-no
stringlengths 2
187
⌀ | categories
stringlengths 5
90
| license
stringclasses 9
values | abstract
stringlengths 21
2.62k
| versions
stringlengths 62
2.35k
| update_date
stringlengths 10
10
| authors_parsed
stringlengths 39
44.4k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3,300 |
2210.03713
|
Daniel Marew
|
Daniel Marew, Misha Lvovsky, Shangqun Yu, Shotaro Sessions, and
Donghyun Kim
|
Integration of Riemannian Motion Policy and Whole-Body Control for
Dynamic Legged Locomotion
| null | null | null | null |
cs.RO
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we present a novel Riemannian Motion Policy (RMP)flow-based
whole-body control framework for improved dynamic legged locomotion. RMPflow is
a differential geometry-inspired algorithm for fusing multiple task-space
policies (RMPs) into a configuration space policy in a geometrically consistent
manner. RMP-based approaches are especially suited for designing simultaneous
tracking and collision avoidance behaviors and have been successfully deployed
on serial manipulators. However, one caveat of RMPflow is that it is designed
with fully actuated systems in mind. In this work, we, for the first time,
extend it to the domain of dynamic-legged systems, which have unforgiving
under-actuation and limited control input. Thorough push recovery experiments
are conducted in simulation to validate the overall framework. We show that
expanding the valid stepping region with an RMP-based collision-avoidance swing
leg controller improves balance robustness against external disturbances by up
to $53\%$ compared to a baseline approach using a restricted stepping region.
Furthermore, a point-foot biped robot is purpose-built for experimental studies
of dynamic biped locomotion. A preliminary unassisted in-place stepping
experiment is conducted to show the viability of the control framework and
hardware.
|
[{'version': 'v1', 'created': 'Fri, 7 Oct 2022 17:34:36 GMT'}]
|
2022-10-10
|
[array(['Marew', 'Daniel', ''], dtype=object)
array(['Lvovsky', 'Misha', ''], dtype=object)
array(['Yu', 'Shangqun', ''], dtype=object)
array(['Sessions', 'Shotaro', ''], dtype=object)
array(['Kim', 'Donghyun', ''], dtype=object)]
|
3,301 |
1708.00192
|
Jorge Lloret-Gazo
|
Jorge Lloret-Gazo
|
A Survey on Visual Query Systems in the Web Era (extended version)
|
34 pages. 32 figures
| null | null | null |
cs.DB cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As more and more collections of data are becoming available on the web to
everyone, non expert users demand easy ways to retrieve data from these
collections. One solution is the so called Visual Query Systems (VQS) where
queries are represented visually and users do not have to understand query
languages such as SQL or XQuery. In 1996, a paper by Catarci reviewed the
Visual Query Systems available until that year. In this paper, we review VQSs
from 1997 until now and try to determine whether they have been the solution
for non expert users. The short answer is no because very few systems have in
fact been used in real environments or as commercial tools. We have also
gathered basic features of VQSs such as the visual representation adopted to
present the reality of interest or the visual representation adopted to express
queries.
|
[{'version': 'v1', 'created': 'Tue, 1 Aug 2017 07:37:16 GMT'}]
|
2017-08-02
|
[array(['Lloret-Gazo', 'Jorge', ''], dtype=object)]
|
3,302 |
cs/0208001
|
Carlos Gershenson
|
Carlos Gershenson
|
Classification of Random Boolean Networks
|
8 pages, 11 figures, 5 tables. To be published in Standish, Abbass
and Bedau (eds.) Artificial Life VIII
| null | null | null |
cs.CC cs.DM math.DS nlin.CG
| null |
We provide the first classification of different types of Random Boolean
Networks (RBNs). We study the differences of RBNs depending on the degree of
synchronicity and determinism of their updating scheme. For doing so, we first
define three new types of RBNs. We note some similarities and differences
between different types of RBNs with the aid of a public software laboratory we
developed. Particularly, we find that the point attractors are independent of
the updating scheme, and that RBNs are more different depending on their
determinism or non-determinism rather than depending on their synchronicity or
asynchronicity. We also show a way of mapping non-synchronous deterministic
RBNs into synchronous RBNs. Our results are important for justifying the use of
specific types of RBNs for modelling natural phenomena.
|
[{'version': 'v1', 'created': 'Thu, 1 Aug 2002 13:26:57 GMT'}]
|
2007-05-23
|
[array(['Gershenson', 'Carlos', ''], dtype=object)]
|
3,303 |
1201.3408
|
Velimir Ilic
|
Milos B. Djuric, Velimir M. Ilic and Miomir S. Stankovic
|
The computation of first order moments on junction trees
|
9 pages, 1 figure
| null | null | null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review some existing methods for the computation of first order moments on
junction trees using Shafer-Shenoy algorithm. First, we consider the problem of
first order moments computation as vertices problem in junction trees. In this
way, the problem is solved using the memory space of an order of the junction
tree edge-set cardinality. After that, we consider two algorithms,
Lauritzen-Nilsson algorithm, and Mau\'a et al. algorithm, which computes the
first order moments as the normalization problem in junction tree, using the
memory space of an order of the junction tree leaf-set cardinality.
|
[{'version': 'v1', 'created': 'Tue, 17 Jan 2012 01:28:55 GMT'}]
|
2012-01-18
|
[array(['Djuric', 'Milos B.', ''], dtype=object)
array(['Ilic', 'Velimir M.', ''], dtype=object)
array(['Stankovic', 'Miomir S.', ''], dtype=object)]
|
3,304 |
0903.0083
|
Ilya Kirnos Vasilyevich
|
Ilya V. Kirnos, Andrew N. Makarenko
|
Accelerating cosmologies in Lovelock gravity with dilaton
|
23 pages
| null |
10.2174/1874381101003010037
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For the description of the Universe expansion, compatible with observational
data, a model of modified gravity - Lovelock gravity with dilaton - is
investigated. D-dimensional space with 3- and (D-4)-dimensional maximally
symmetric subspaces is considered. Space without matter and space with perfect
fluid are under test. In various forms of the theory under way (third order
without dilaton and second order - Einstein-Gauss-Bonnet gravity - with dilaton
and without it) stationary, power-law, exponential and exponent-of-exponent
form cosmological solutions are obtained. Last two forms include solutions
which are clear to describe accelerating expansion of 3-dimensional subspace.
Also there is a set of solutions describing cosmological expansion which does
not tend to isotropization in the presence of matter.
|
[{'version': 'v1', 'created': 'Sat, 28 Feb 2009 15:48:11 GMT'}]
|
2015-05-13
|
[array(['Kirnos', 'Ilya V.', ''], dtype=object)
array(['Makarenko', 'Andrew N.', ''], dtype=object)]
|
3,305 |
cond-mat/0611272
|
Zhiqiang Li
|
Z. Q. Li, S.-W. Tsai, W. J. Padilla, S. V. Dordevic, K. S. Burch, Y.
J. Wang, and D. N. Basov
|
Infrared probe of the anomalous magnetotransport of highly oriented
pyrolytic graphite in the extreme quantum limit
| null |
Phys. Rev. B 74, 195404 (2006)
|
10.1103/PhysRevB.74.195404
| null |
cond-mat.mes-hall cond-mat.str-el
| null |
We present a systematic investigation of the magnetoreflectance of highly
oriented pyrolytic graphite in magnetic field B up to 18 T . From these
measurements, we report the determination of lifetimes tau associated with the
lowest Landau levels in the quantum limit. We find a linear field dependence
for inverse lifetime 1/tau(B) of the lowest Landau levels, which is consistent
with the hypothesis of a three-dimensional (3D) to 1D crossover in an
anisotropic 3D metal in the quantum limit. This enigmatic result uncovers the
origin of the anomalous linear in-plane magnetoresistance observed both in bulk
graphite and recently in mesoscopic graphite samples.
|
[{'version': 'v1', 'created': 'Fri, 10 Nov 2006 02:24:36 GMT'}]
|
2009-11-11
|
[array(['Li', 'Z. Q.', ''], dtype=object)
array(['Tsai', 'S. -W.', ''], dtype=object)
array(['Padilla', 'W. J.', ''], dtype=object)
array(['Dordevic', 'S. V.', ''], dtype=object)
array(['Burch', 'K. S.', ''], dtype=object)
array(['Wang', 'Y. J.', ''], dtype=object)
array(['Basov', 'D. N.', ''], dtype=object)]
|
3,306 |
astro-ph/0111463
|
Juha Reunanen
|
J. Reunanen (Tuorla Observatory), J. K. Kotilainen (Tuorla
Observatory), M. A. Prieto (ESO, Garching)
|
Near-infrared spectroscopy of nearby Seyfert galaxies. I. First results
|
16 pages, 20 figures, uses mn.sty. Accepted for publication in MNRAS
|
Mon.Not.Roy.Astron.Soc. 331 (2002) 154
|
10.1046/j.1365-8711.2002.05181.x
| null |
astro-ph
| null |
We present near-infrared 1.5 - 2.5 micron moderate resolution long-slit
spectra of two Seyfert 1 galaxies (NGC 1097 and NGC 1566), three Seyfert 2s
(NGC 1386, NGC 4945 and NGC 5128) and one Seyfert 1.5 (NGC 3227), both parallel
to ionization cone or jet and perpendicular to it. The spectra are used to
study the spatial extent of the line emission, integrated masses of excited H2
and the excitation mechanisms of interstellar gas. Broad BrGgamma originating
from the BLR is detected in three galaxies (NGC 1386, NGC 1566 and NGC 3227),
of which NGC 1386 is optically classified as Seyfert 2. In these galaxies iron
is narrow and may be X-ray excited. In all galaxies except in NGC 5128, the
spatial FWHM size of H2 1--0 S(1) nuclear core is larger perpendicular to the
cone or jet than parallel to it, in agreement with AGN unified models. The
surface densities of H2 are higher in Seyfert 2s than in Seyfert 1s, with the
Seyfert 1.5 NGC 3227 lying between them. The exception to this is the Seyfert 2
NGC 1386, where two extended regions are detected parallel to cone. Coronal
lines are detected in two galaxies, NGC 1386 and NGC 3227.
|
[{'version': 'v1', 'created': 'Sat, 24 Nov 2001 10:31:13 GMT'}]
|
2009-11-07
|
[array(['Reunanen', 'J.', '', 'Tuorla Observatory'], dtype=object)
array(['Kotilainen', 'J. K.', '', 'Tuorla\n Observatory'], dtype=object)
array(['Prieto', 'M. A.', '', 'ESO, Garching'], dtype=object)]
|
3,307 |
quant-ph/0206167
|
Chih-Lung Chou
|
Chih-Lung Chou, Li-Yi Hsu
|
Optimal Guessing Strategies in a Quantum Card Game
|
1 table
| null | null | null |
quant-ph
| null |
Three different quantum cards which are non-orthogonal quantum bits are sent
to two different players, Alice and Bob, randomly. Alice receives one of the
three cards, and Bob receives the remaining two cards. We find that Bob could
know better than Alice does on guessing Alice's card, no matter what Bob
chooses to measure his two cards collectively or separately. We also find that
Bob's best strategy for guessing Alice's card is to measure his two cards
collectively.
|
[{'version': 'v1', 'created': 'Mon, 24 Jun 2002 08:12:48 GMT'}]
|
2007-05-23
|
[array(['Chou', 'Chih-Lung', ''], dtype=object)
array(['Hsu', 'Li-Yi', ''], dtype=object)]
|
3,308 |
2007.06997
|
Tareq Al-Khraishi
|
Tareq Al-Khraishi and Muhannad Quwaider
|
Performance evaluation and enhancement of VLAN via wireless networks
using OPNET modeler
| null |
International Journal of Wireless & Mobile Networks (IJWMN) Vol.
12, No. 3, June 2020
|
10.5121/ijwmn.2020.12302
| null |
cs.NI
|
http://creativecommons.org/licenses/by/4.0/
|
A VLAN is a logical connection that allows hosts to be grouped together in
the same broadcast domain, so that packets are delivered only to ports that are
combined to the same VLAN. We can improve wireless network performance and save
bandwidth through the characteristic VLAN network. In addition, the
implementation of VLAN greatly improves wireless network security by reducing
the number of hosts receiving copies of frames broadcast by switches, thus
keeping hosts holding critical data on a separate VLAN. In this paper we
compare wireless network with VLAN via wireless network. The proposed network
is evaluated within terms of delay and average throughput using web browsing
applications and file transfer in heavy traffic. The simulation was carried out
using OPNET 14.5 modeler and the results show that the use of VLAN via wireless
network improved performance by reducing traffic resulting in a minimized delay
time. Furthermore, VLAN implementation reduces network throughput because the
traffic received and transmitted has a positive relationship with throughput.
Eventually, we investigated the use of adhoc routing protocols such as AODV,
DSR, OLSR, TORA and GPR to improve the performance of wireless VLAN networks.
|
[{'version': 'v1', 'created': 'Tue, 14 Jul 2020 12:27:57 GMT'}]
|
2020-07-15
|
[array(['Al-Khraishi', 'Tareq', ''], dtype=object)
array(['Quwaider', 'Muhannad', ''], dtype=object)]
|
3,309 |
cond-mat/0311640
|
Francesco Paolo Mancini
|
F.P. Mancini, P. Sodano, and A. Trombettoni
|
Self-Consistent Mean-Field Theory for Frustrated Josephson Junction
Arrays
|
Presented by F. P. Mancini at the Conference "Highlights in Condensed
Matter Physics", May 9-11 2003, Salerno, Italy
|
Highlights in Condensed Matter Physics, A. Avella, R. Citro, C.
Noce and M. Salerno eds., AIP Conference Proceedings Vol. 695, pp. 164-175,
AIP Press, New York (2003), ISBN 0-7354-0167-5
|
10.1063/1.1639587
| null |
cond-mat.supr-con
| null |
We review the self-consistent mean-field theory for charge-frustrated
Josephson junction arrays. Using <cos(\phi)> (\phi is the phase of the
superconducting wavefunction) as order parameter and imposing the
self-consistency condition, we compute the phase boundary line between the
superconducting region (<cos(\phi)> not equal to zero) and the insulating one
(<cos(\phi)> = 0). For a uniform offset charge q=e the superconducting phase
increases with respect to the situation in which q=0. Here, we generalize the
self-consistent mean-field theory to include the effects induced by a random
distribution of offset charges and/or of diagonal self-capacitances. For most
of the phase diagram, our results agree with the outcomes of Quantum Monte
Carlo simulations as well as with previous studies using the path-integral
approach.
|
[{'version': 'v1', 'created': 'Fri, 28 Nov 2003 15:31:33 GMT'}]
|
2007-05-23
|
[array(['Mancini', 'F. P.', ''], dtype=object)
array(['Sodano', 'P.', ''], dtype=object)
array(['Trombettoni', 'A.', ''], dtype=object)]
|
3,310 |
2306.07136
|
Mahmoud Samadpour
|
Atena Mohamadnezhad, Mahmoud Samadpour
|
A simple all-inorganic hole-only device structure for monitoring the
trap densities in perovskite solar cells
| null | null | null | null |
cond-mat.mes-hall cond-mat.mtrl-sci
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
One of the most critical challenges in soaring the performance of perovskite
solar cells is decreasing the density of trap states in the light-absorbing
perovskite layer. These traps cause an increase in the recombination of charge
carriers and decrease the efficiency of devices. One of the methods to study
the trap density is space charge limited current (SCLC) analysis. For this
purpose, some structures are needed with the ability to transport only
electrons or holes. The trap density can be calculated by investigating the
current-voltage diagram and finding the voltage corresponding to the slope
change point. One of the challenges in these structures is using organic
polymers like Spiro-OMeTAD, PEDOT: PSS, and PTAA as hole transport layers. They
have problems like high acidity, lack of stability against moisture, low charge
mobility, low conductivity, and high cost. In this work, a hole-only device
structure is explained, made based on inorganic materials, which possesses high
stability, a simple preparation method, and reasonable cost compared to
conventional hole-only device structures. This structure is built by coating a
nanostructured NiOx layer, perovskite, CIS, and Au on the ITO substrate. To
investigate the performance of this structure, various perovskite layers were
made at different experimental conditions, and their trap density was obtained
by the proposed hole-only device structure. The analysis of the photovoltaic
characteristics of cells revealed a clear correlation between the perovskite
layer's trap density and the cells' performance. Our results show the
introduced structure is a simple and stable structure that can be utilized in
studying the trap density in perovskite layers to make more efficient cells.
|
[{'version': 'v1', 'created': 'Mon, 12 Jun 2023 14:18:39 GMT'}]
|
2023-06-13
|
[array(['Mohamadnezhad', 'Atena', ''], dtype=object)
array(['Samadpour', 'Mahmoud', ''], dtype=object)]
|
3,311 |
1808.05815
|
Dharmesh Rathaud
|
D. P. Rathaud and Ajay Kumar Rai
|
Interaction and Identification of the Meson-Baryon molecules
|
19 pages, 7 Figures, 10 Tables, Comments and Suggestions are invited
|
Indian J Physics (2021)
|
10.1007/s12648-020-01954-6
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The challenges with the molecular model of the multiquark systems are the
identification of the hadronic molecules and the interaction between two color
neutral hadrons. We study the di-hadronic molecular systems with proposed
interaction potential as s-wave one boson exchange potential along with Screen
Yukawa-like potential, and arrived with the proposal that within hadronic
molecule the two color neutral hadrons experience the dipole-like interaction.
The present study is the continuation of our previous study
\cite{arxiv-Rathaud-penta}. With the proposed interaction potential, the mass
spectra of $\Sigma_{s}K^{*}$, $\Sigma_{c}K^{*}$, $\Sigma_{b}K^{*}$,
$\Sigma_{s}D^{*}$, $\Sigma_{c}D^{*}$, $\Sigma_{b}D^{*}$, $\Sigma_{s}B^{*}$,
$\Sigma_{c}B^{*}$, $\Sigma_{b}B^{*}$, $\Xi_{s}K^{*}$, $\Xi_{c}K^{*}$,
$\Xi_{b}K^{*}$, $\Xi_{s}D^{*}$, $\Xi_{c}D^{*}$, $\Xi_{b}D^{*}$, $\Xi_{s}B^{*}$,
$\Xi_{c}B^{*}$, $\Xi_{b}B^{*}$ meson-baryon molecules are predicted. The
Weinberg compositeness theorem which provides clue for the compositeness of the
state is used for determination of the scattering length and effective range.
The present study predict $P_{c}(4450)$ pentaquark sate as $\Sigma_{c}D^{*}$
molecule with $I(J^{P})=\frac{1}{2}(\frac{3}{2}^{-})$. The formalism also
predicts some very interesting open as well as hidden flavour near threshold
molecular pentaquark states.
|
[{'version': 'v1', 'created': 'Fri, 17 Aug 2018 10:05:26 GMT'}]
|
2021-02-08
|
[array(['Rathaud', 'D. P.', ''], dtype=object)
array(['Rai', 'Ajay Kumar', ''], dtype=object)]
|
3,312 |
1512.01793
|
Kazuhiko Inoue
|
Kazuhiko Inoue
|
Trivializing number of positive knots
|
19 pages, 34 figures. arXiv admin note: substantial text overlap with
arXiv:1508.00096
| null | null | null |
math.KT math.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we give the trivializing number of all minimal diagrams of
positive 2-bridge knots, and study the relation between the trivializing number
and the unknotting number for a part of these knots.
|
[{'version': 'v1', 'created': 'Sun, 6 Dec 2015 14:17:27 GMT'}]
|
2015-12-08
|
[array(['Inoue', 'Kazuhiko', ''], dtype=object)]
|
3,313 |
1410.5350
|
Tihomir Valchev TIV
|
Tihomir Valchev
|
Dressing method and quadratic bundles related to symmetric spaces.
Vanishing boundary conditions
|
18 pages
|
Journal of Mathematical Physics, Vol. 57, 021508 (2016)
|
10.1063/1.4940996
| null |
nlin.SI math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider quadratic bundles related to Hermitian symmetric spaces of the
type SU(m+n)/S(U(m)x U(n)). The simplest representative of the corresponding
integrable hierarchy is given by a multi-component Kaup-Newell derivative
nonlinear Schroedinger equation which serves as a motivational example for our
general considerations. We extensively discuss how one can apply
Zakharov-Shabat's dressing procedure to derive reflectionless potentials
obeying zero boundary conditions. Those could be used for one to construct fast
decaying solutions to any nonlinear equation belonging to the same hierarchy.
One can distinguish between generic soliton type solutions and rational
solutions.
|
[{'version': 'v1', 'created': 'Mon, 20 Oct 2014 16:47:38 GMT'}]
|
2018-03-28
|
[array(['Valchev', 'Tihomir', ''], dtype=object)]
|
3,314 |
1112.2268
|
Thomas Blesgen
|
T. Blesgen, F. Fraternali, J.R. Raney, A. Amendola, C. Daraio
|
Continuum limits of bistable spring models of carbon nanotube arrays
accounting for material damage
|
11 pages, 1 figure
| null | null | null |
math-ph cond-mat.mtrl-sci math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using chains of bistable springs, a model is derived to investigate the
plastic behavior of carbon nanotube arrays with damage. We study the
preconditioning effect due to the loading history by computing analytically the
stress-strain pattern corresponding to a fatigue-type damage of the structure.
We identify the convergence of the discrete response to the limiting case of
infinitely many springs, both analytically in the framework of
Gamma-convergence, as well as numerically.
|
[{'version': 'v1', 'created': 'Sat, 10 Dec 2011 11:09:03 GMT'}]
|
2011-12-13
|
[array(['Blesgen', 'T.', ''], dtype=object)
array(['Fraternali', 'F.', ''], dtype=object)
array(['Raney', 'J. R.', ''], dtype=object)
array(['Amendola', 'A.', ''], dtype=object)
array(['Daraio', 'C.', ''], dtype=object)]
|
3,315 |
0912.2435
|
She-Sheng Xue
|
She-Sheng Xue
|
Detailed discussions and calculations of quantum Regge calculus of
Einstein-Cartan theory
|
the final version to appear in PRD, 52 pages and 6 figures, title has
been changed
|
Phys.Rev.D82:064039,2010
|
10.1103/PhysRevD.82.064039
| null |
hep-th gr-qc hep-lat hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article presents detailed discussions and calculations of the recent
paper "Quantum Regge calculus of Einstein-Cartan theory" in Phys. Lett. B682
(2009) 300. The Euclidean space-time is discretized by a four-dimensional
simplicial complex. We adopt basic tetrad and spin-connection fields to
describe the simplicial complex. By introducing diffeomorphism and local
Lorentz invariant holonomy fields, we construct a regularized Einstein-Cartan
theory for studying the quantum dynamics of the simplicial complex and fermion
fields. This regularized Einstein-Cartan action is shown to properly approach
to its continuum counterpart in the continuum limit. Based on the local Lorentz
invariance, we derive the dynamical equations satisfied by invariant holonomy
fields. In the mean-field approximation, we show that the averaged size of
4-simplex, the element of the simplicial complex, is larger than the Planck
length. This formulation provides a theoretical framework for analytical
calculations and numerical simulations to study the quantum Einstein-Cartan
theory.
|
[{'version': 'v1', 'created': 'Sat, 12 Dec 2009 16:43:06 GMT'}
{'version': 'v2', 'created': 'Sun, 21 Feb 2010 16:39:29 GMT'}
{'version': 'v3', 'created': 'Fri, 17 Sep 2010 17:56:54 GMT'}
{'version': 'v4', 'created': 'Thu, 7 Oct 2010 18:05:37 GMT'}]
|
2010-10-08
|
[array(['Xue', 'She-Sheng', ''], dtype=object)]
|
3,316 |
astro-ph/0012467
|
Giovanni Fossati
|
G. Fossati (UCSD, Center for Astrophysics and Space Sciences)
|
Demographics of Blazars
|
invited talk at the Workshop "Blazar Demographics and Physics"
Baltimore, July 2000, ASP Conf. Series, P. Padovani and C. M. Urry eds., in
press. (6 pages, LaTex, 10 PostScript figures, uses newpasp.sty). Postscript
also available at http://mamacass.ucsd.edu/~gfossati/pub_list.html
| null | null | null |
astro-ph
| null |
We discuss the preliminary results of an extensive effort to address the
fundamental, and yet un-answered, question that can be trivialized as: ``are
there more blue or red blazars?''. This problematic is tightly connected with
the much debated issue of the unified picture(s) of radio-loud AGNs, which in
turn revolves around the existence, and the properties of relativistic jets. We
address this question by comparing -- simultaneously -- the properties of the
collection of heterogeneously selected samples that are available now, with the
predictions of a set of plausible unifications scenarios. We show that it is
already possible to make significant progress even by using only the present
samples. The important role of selection effects is discussed. For instance we
show that the multiple flux selections typical of available surveys could
induce some of the correlations found in color-color diagrams. These latter
results should apply to any study of flux limited samples.
|
[{'version': 'v1', 'created': 'Thu, 21 Dec 2000 19:47:54 GMT'}]
|
2007-05-23
|
[array(['Fossati', 'G.', '',
'UCSD, Center for Astrophysics and Space Sciences'], dtype=object)]
|
3,317 |
1610.05642
|
Cleon Barroso S.
|
C. S. Barroso and V. Ferreira
|
Weak Compactness and Fixed Point Property for Affine Bi-Lipschitz Maps
|
16 pages; this new version brings several improvements including
simplifications, few references were added. The abstract results concerning
locally convex spaces of the previous version will be incorporated in another
paper. A new submission process is on course
| null | null | null |
math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we show that if $(y_n)$ is a seminormalized sequence in a
Banach space which does not have any weakly convergent subsequence, then it
contains a wide-$(s)$ subsequence $(x_n)$ which admits an equivalent convex
basic sequence. This fact is used to characterize weak-compactness of bounded,
closed convex sets in terms of the generic fixed point property
($\mathcal{G}$-$FPP$) for the class of affine bi-Lipschitz maps. This result
generalizes a theorem by Benavides, Jap\'on Pineda and Prus previously proved
for the class of continuous maps. We also introduce a relaxation of this notion
($\mathcal{WG}$-$FPP$) and observe that a closed convex bounded subset of a
Banach space is weakly compact iff it has the $\mathcal{WG}$-$FPP$ for affine
$1$-Lipschitz maps. Related results are also proved. For example, a complete
convex bounded subset $C$ of a Hlcs $X$ is weakly compact iff it has the
$\mathcal{G}$-$FPP$ for the class of affine continuous maps $f\colon C\to X$
with weak-approximate fixed point nets.
|
[{'version': 'v1', 'created': 'Tue, 18 Oct 2016 14:35:27 GMT'}
{'version': 'v2', 'created': 'Thu, 22 Mar 2018 19:42:12 GMT'}]
|
2018-03-26
|
[array(['Barroso', 'C. S.', ''], dtype=object)
array(['Ferreira', 'V.', ''], dtype=object)]
|
3,318 |
2201.08312
|
Andy Jarnevic
|
Andy Jarnevic
|
The geometry of subgroup embeddings and asymptotic cones
|
20 pages, 4 figures, added a citation to a paper of Behrstock
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Given a finitely generated subgroup $H$ of a finitely generated group $G$ and
a non-principal ultrafilter $\omega$, we consider a natural subspace,
$Cone^{\omega}_{G}(H)$, of the asymptotic cone of $G$ corresponding to $H$.
Informally, this subspace consists of the points of the asymptotic cone of $G$
represented by elements of the ultrapower $H^{\omega}$. We show that the
connectedness and convexity of $Cone^{\omega}_{G}(H)$ detect natural properties
of the embedding of $H$ in $G$. We begin by defining a generalization of the
distortion function and show that this function determines whether
$Cone^{\omega}_{G}(H)$ is connected. We then show that whether $H$ is strongly
quasi-convex in $G$ is detected by a natural convexity property of
$Cone^{\omega}_{G}(H)$ in the asymptotic cone of $G$.
|
[{'version': 'v1', 'created': 'Thu, 20 Jan 2022 17:23:56 GMT'}
{'version': 'v2', 'created': 'Wed, 9 Feb 2022 17:22:20 GMT'}]
|
2022-02-10
|
[array(['Jarnevic', 'Andy', ''], dtype=object)]
|
3,319 |
astro-ph/0608221
|
Nicolas Labrosse
|
Nicolas Labrosse (1), Pierre Gouttebroze (2), Jean-Claude Vial (2)
((1) Institute of Mathematical and Physical Sciences, University of Wales
Aberystwyth, UK, (2) Institut d'Astrophysique Spatiale, CNRS-Universite Paris
Sud, Orsay, France)
|
Effect of motions in prominences on the helium resonance lines in the
extreme ultraviolet
|
Replaced by revised version: 13 pages, 14 figures, accepted for
publication in A&A
|
Astron.Astrophys. 463 (2007) 1171-1179
|
10.1051/0004-6361:20065775
| null |
astro-ph physics.space-ph
| null |
We aim at studying the effect of radial motions on the spectrum emitted by
moving prominences in the helium resonance lines and at facilitating the
interpretation of observations, in order to improve our understanding of these
dynamic structures. We develop our non-local thermodynamic equilibrium
radiative transfer code formerly used for the study of quiescent prominences.
The new numerical code is now able to solve the statistical equilibrium and
radiative transfer equations in the non-static case by using velocity-dependent
boundary conditions for the solution of the radiative transfer problem. This
first study investigates the effects of different physical conditions
(temperature, pressure, geometrical thickness) on the emergent helium
radiation. The motion of the prominence plasma induces a Doppler dimming effect
on the resonance lines of He I and He II. The velocity effects are particularly
important for the He II 304 A line as it is mostly formed by resonant diffusion
of incident radiation under prominence conditions. The He I resonance lines at
584 and 537 A also show some sensitivity to the motion of the plasma, all the
more when thermal emission is not too important in these lines. We also show
that it is necessary to consider partial redistribution in frequency for the
scattering of the incident radiation. This set of helium lines offers strong
diagnostic possibilities that can be exploited with the SOHO spectrometers and
with the EIS spectrometer on board the Hinode satellite. The addition of other
helium lines and of lines from other elements (in particular hydrogen) in the
diagnostics will further enhance the strength of the method.
|
[{'version': 'v1', 'created': 'Thu, 10 Aug 2006 15:34:17 GMT'}
{'version': 'v2', 'created': 'Fri, 8 Dec 2006 22:06:27 GMT'}]
|
2007-05-23
|
[array(['Labrosse', 'Nicolas', ''], dtype=object)
array(['Gouttebroze', 'Pierre', ''], dtype=object)
array(['Vial', 'Jean-Claude', ''], dtype=object)]
|
3,320 |
2110.06887
|
\"Unal Ege Gaznepo\u{g}lu
|
\"Unal Ege Gaznepoglu, Nils Peters
|
Exploring the Importance of F0 Trajectories for Speaker Anonymization
using X-vectors and Neural Waveform Models
|
6 figures, 2 tables, accepted to Workshop on Machine Learning in
Speech and Language Processing 2021 Example audio files and the poster
available https://www.audiolabs-erlangen.de/fau/
professor/peters/publications/MLSLP2021
| null | null | null |
eess.AS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Voice conversion for speaker anonymization is an emerging field in speech
processing research. Many state-of-the-art approaches are based on the
resynthesis of the phoneme posteriorgrams (PPG), the fundamental frequency (F0)
of the input signal together with modified X-vectors. Our research focuses on
the role of F0 for speaker anonymization, which is an understudied area.
Utilizing the VoicePrivacy Challenge 2020 framework and its datasets we
developed and evaluated eight low-complexity F0 modifications prior
resynthesis. We found that modifying the F0 can improve speaker anonymization
by as much as 8% with minor word-error rate degradation.
|
[{'version': 'v1', 'created': 'Wed, 13 Oct 2021 17:19:51 GMT'}]
|
2021-10-14
|
[array(['Gaznepoglu', 'Ünal Ege', ''], dtype=object)
array(['Peters', 'Nils', ''], dtype=object)]
|
3,321 |
1806.10128
|
Qicheng Lao
|
Qicheng Lao, Thomas Fevens and Boyu Wang
|
Leveraging Disease Progression Learning for Medical Image Recognition
| null |
IEEE International Conference on Bioinformatics and Biomedicine
(BIBM) 2018
| null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Unlike natural images, medical images often have intrinsic characteristics
that can be leveraged for neural network learning. For example, images that
belong to different stages of a disease may continuously follow a certain
progression pattern. In this paper, we propose a novel method that leverages
disease progression learning for medical image recognition. In our method,
sequences of images ordered by disease stages are learned by a neural network
that consists of a shared vision model for feature extraction and a long
short-term memory network for the learning of stage sequences. Auxiliary vision
outputs are also included to capture stage features that tend to be discrete
along the disease progression. Our proposed method is evaluated on a public
diabetic retinopathy dataset, and achieves about 3.3% improvement in disease
staging accuracy, compared to the baseline method that does not use disease
progression learning.
|
[{'version': 'v1', 'created': 'Tue, 26 Jun 2018 17:58:56 GMT'}
{'version': 'v2', 'created': 'Sat, 1 Sep 2018 20:48:18 GMT'}]
|
2019-05-29
|
[array(['Lao', 'Qicheng', ''], dtype=object)
array(['Fevens', 'Thomas', ''], dtype=object)
array(['Wang', 'Boyu', ''], dtype=object)]
|
3,322 |
0904.4422
|
Andrew Smith
|
VERITAS Collaboration:V. A. Acciari, E. Aliu, T. Arlen, M. Bautista,
M. Beilicke, W. Benbow, M. Bottcher, S. M. Bradbury, V. Bugaev, Y. Butt, Y.
Butt, K. Byrum0, A. Cannon, A. Cesarini, Y. C. Chow, L. Ciupik, P. Cogan, P.
Colin, W. Cui, M. Daniel, R. Dickherber, T. Ergin, A. Falcone, S. J. Fegan,
J. P. Finley, P. Fortin, L. Fortson, A. Furniss, D. Gall, G. H. Gillanders,
J. Grube, R. Guenette, G. Gyuk, D. Hanna, E. Hays, J. Holder, D. Horan, C. M.
Hui, T. B. Humensky, P. Kaaret, N. Karlsson, D. Kieda, J. Kildea, A.
Konopelko, H. Krawczynski, F. Krennrich, M. J. Lang, S. LeBohec, G. Maier, A.
McCann, M. McCutcheon, J. Millis, P. Moriarty, R. Mukherjee, T. Nagai, R. A.
Ong, A. N. Otte, D. Pandel, J. S. Perkins, J. S. Perkins, M. Pohl, J. Quinn,
K. Ragan, L. C. Reyes, P. T. Reynolds, E. Roache, H. J. Rose, M. Schroedter,
G. H. Sembroski, A. W. Smith, D. Steele, M. Stroh, S. Swordy, M. Theiling, J.
A. Toner, A. Varlotta, V. V. Vassiliev, R. G. Wagner, S. P. Wakely, J. E.
Ward, T. C. Weekes, A. Weinsteiny, R. J. White, D. A. Williams, S. Wissely,
M. Woody, B. Zitzer
|
Multiwavelength Observations of LS I +61 303 with VERITAS, Swift and
RXTE
|
30 pages, 5 figures, 2 table, Accepted for publication in The
Astrophysical Journal
| null |
10.1088/0004-637X/700/2/1034
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results from a long-term monitoring campaign on the TeV binary LSI
+61 303 with VERITAS at energies above 500 GeV, and in the 2-10 keV hard X-ray
bands with RXTE and Swift, sampling nine 26.5 day orbital cycles between
September 2006 and February 2008. The binary was observed by VERITAS to be
variable, with all integrated observations resulting in a detection at the 8.8
sigma (2006/2007) and 7.3 sigma (2007/2008) significance level for emission
above 500 GeV. The source was detected during active periods with flux values
ranging from 5 to 20% of the Crab Nebula, varying over the course of a single
orbital cycle. Additionally, the observations conducted in the 2007-2008
observing season show marginal evidence (at the 3.6 sigma significance level)
for TeV emission outside of the apastron passage of the compact object around
the Be star. Contemporaneous hard X-ray observations with RXTE and Swift show
large variability with flux values typically varying between 0.5 and 3.0*10^-11
ergs cm^-2 s^-1 over a single orbital cycle. The contemporaneous X-ray and TeV
data are examined and it is shown that the TeV sampling is not dense enough to
detect a correlation between the two bands.
|
[{'version': 'v1', 'created': 'Tue, 28 Apr 2009 19:38:41 GMT'}]
|
2015-05-13
|
[array(['VERITAS Collaboration', '', ''], dtype=object)
array(['Acciari', 'V. A.', ''], dtype=object)
array(['Aliu', 'E.', ''], dtype=object)
array(['Arlen', 'T.', ''], dtype=object)
array(['Bautista', 'M.', ''], dtype=object)
array(['Beilicke', 'M.', ''], dtype=object)
array(['Benbow', 'W.', ''], dtype=object)
array(['Bottcher', 'M.', ''], dtype=object)
array(['Bradbury', 'S. M.', ''], dtype=object)
array(['Bugaev', 'V.', ''], dtype=object)
array(['Butt', 'Y.', ''], dtype=object)
array(['Butt', 'Y.', ''], dtype=object)
array(['Byrum0', 'K.', ''], dtype=object)
array(['Cannon', 'A.', ''], dtype=object)
array(['Cesarini', 'A.', ''], dtype=object)
array(['Chow', 'Y. C.', ''], dtype=object)
array(['Ciupik', 'L.', ''], dtype=object)
array(['Cogan', 'P.', ''], dtype=object)
array(['Colin', 'P.', ''], dtype=object)
array(['Cui', 'W.', ''], dtype=object)
array(['Daniel', 'M.', ''], dtype=object)
array(['Dickherber', 'R.', ''], dtype=object)
array(['Ergin', 'T.', ''], dtype=object)
array(['Falcone', 'A.', ''], dtype=object)
array(['Fegan', 'S. J.', ''], dtype=object)
array(['Finley', 'J. P.', ''], dtype=object)
array(['Fortin', 'P.', ''], dtype=object)
array(['Fortson', 'L.', ''], dtype=object)
array(['Furniss', 'A.', ''], dtype=object)
array(['Gall', 'D.', ''], dtype=object)
array(['Gillanders', 'G. H.', ''], dtype=object)
array(['Grube', 'J.', ''], dtype=object)
array(['Guenette', 'R.', ''], dtype=object)
array(['Gyuk', 'G.', ''], dtype=object)
array(['Hanna', 'D.', ''], dtype=object)
array(['Hays', 'E.', ''], dtype=object)
array(['Holder', 'J.', ''], dtype=object)
array(['Horan', 'D.', ''], dtype=object)
array(['Hui', 'C. M.', ''], dtype=object)
array(['Humensky', 'T. B.', ''], dtype=object)
array(['Kaaret', 'P.', ''], dtype=object)
array(['Karlsson', 'N.', ''], dtype=object)
array(['Kieda', 'D.', ''], dtype=object)
array(['Kildea', 'J.', ''], dtype=object)
array(['Konopelko', 'A.', ''], dtype=object)
array(['Krawczynski', 'H.', ''], dtype=object)
array(['Krennrich', 'F.', ''], dtype=object)
array(['Lang', 'M. J.', ''], dtype=object)
array(['LeBohec', 'S.', ''], dtype=object)
array(['Maier', 'G.', ''], dtype=object)
array(['McCann', 'A.', ''], dtype=object)
array(['McCutcheon', 'M.', ''], dtype=object)
array(['Millis', 'J.', ''], dtype=object)
array(['Moriarty', 'P.', ''], dtype=object)
array(['Mukherjee', 'R.', ''], dtype=object)
array(['Nagai', 'T.', ''], dtype=object)
array(['Ong', 'R. A.', ''], dtype=object)
array(['Otte', 'A. N.', ''], dtype=object)
array(['Pandel', 'D.', ''], dtype=object)
array(['Perkins', 'J. S.', ''], dtype=object)
array(['Perkins', 'J. S.', ''], dtype=object)
array(['Pohl', 'M.', ''], dtype=object)
array(['Quinn', 'J.', ''], dtype=object)
array(['Ragan', 'K.', ''], dtype=object)
array(['Reyes', 'L. C.', ''], dtype=object)
array(['Reynolds', 'P. T.', ''], dtype=object)
array(['Roache', 'E.', ''], dtype=object)
array(['Rose', 'H. J.', ''], dtype=object)
array(['Schroedter', 'M.', ''], dtype=object)
array(['Sembroski', 'G. H.', ''], dtype=object)
array(['Smith', 'A. W.', ''], dtype=object)
array(['Steele', 'D.', ''], dtype=object)
array(['Stroh', 'M.', ''], dtype=object)
array(['Swordy', 'S.', ''], dtype=object)
array(['Theiling', 'M.', ''], dtype=object)
array(['Toner', 'J. A.', ''], dtype=object)
array(['Varlotta', 'A.', ''], dtype=object)
array(['Vassiliev', 'V. V.', ''], dtype=object)
array(['Wagner', 'R. G.', ''], dtype=object)
array(['Wakely', 'S. P.', ''], dtype=object)
array(['Ward', 'J. E.', ''], dtype=object)
array(['Weekes', 'T. C.', ''], dtype=object)
array(['Weinsteiny', 'A.', ''], dtype=object)
array(['White', 'R. J.', ''], dtype=object)
array(['Williams', 'D. A.', ''], dtype=object)
array(['Wissely', 'S.', ''], dtype=object)
array(['Woody', 'M.', ''], dtype=object)
array(['Zitzer', 'B.', ''], dtype=object)]
|
3,323 |
0807.3431
|
Johannes Richter
|
Ronald Zinke, Stefan-Ludwig Drechsler, and Johannes Richter
|
Influence of an inter-chain coupling on spiral ground-state correlations
in frustrated spin-1/2 J1-J2 Heisenberg chains
|
9 pages, 11 figures
|
Phys. Rev. B 79, 094425 (2009)
|
10.1103/PhysRevB.79.094425
| null |
cond-mat.str-el cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the influence of an inter-chain coupling on the spiral ground
state correlations of a spin-1/2 Heisenberg model consisting of a
two-dimensional array of coupled chains with nearest (J1) and frustrating
next-nearest neighbor (J2) in-chain exchange couplings. Using the
coupled-cluster method we calculate the transition point between the
commensurate and the incommensurate (spiral) ground state as well as the
quantum pitch angle of the spiral ground state. In addition, we provide a
simple empirical formula which describes the relation between the quantum pitch
angle and the frustration parameter J2/J1.
|
[{'version': 'v1', 'created': 'Tue, 22 Jul 2008 09:38:37 GMT'}
{'version': 'v2', 'created': 'Fri, 21 Aug 2009 09:25:24 GMT'}]
|
2009-08-21
|
[array(['Zinke', 'Ronald', ''], dtype=object)
array(['Drechsler', 'Stefan-Ludwig', ''], dtype=object)
array(['Richter', 'Johannes', ''], dtype=object)]
|
3,324 |
1510.00078
|
Andr\'es Caicedo
|
Andr\'es Eduardo Caicedo, Jacob Hilton
|
Topological Ramsey numbers and countable ordinals
|
Final version
|
Foundations of Mathematics, Contemporary Mathematics, 690, Amer.
Math. Soc., Providence, RI, 2017, pp. 85-118
|
10.1090/conm/690/13864
| null |
math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the topological version of the partition calculus in the setting of
countable ordinals. Let $\alpha$ and $\beta$ be ordinals and let $k$ be a
positive integer. We write $\beta\to_{top}(\alpha,k)^2$ to mean that, for every
red-blue coloring of the collection of 2-sized subsets of $\beta$, there is
either a red-homogeneous set homeomorphic to $\alpha$ or a blue-homogeneous set
of size $k$. The least such $\beta$ is the topological Ramsey number
$R^{top}(\alpha,k)$.
We prove a topological version of the Erd\H{o}s-Milner theorem, namely that
$R^{top}(\alpha,k)$ is countable whenever $\alpha$ is countable. More
precisely, we prove that
$R^{top}(\omega^{\omega^\beta},k+1)\leq\omega^{\omega^{\beta\cdot k}}$ for all
countable ordinals $\beta$ and finite $k$. Our proof is modeled on a new easy
proof of a weak version of the Erd\H{o}s-Milner theorem that may be of
independent interest.
We also provide more careful upper bounds for certain small values of
$\alpha$, proving among other results that $R^{top}(\omega+1,k+1)=\omega^k+1$,
$R^{top}(\alpha,k)< \omega^\omega$ whenever $\alpha<\omega^2$,
$R^{top}(\omega^2,k)\leq\omega^\omega$ and
$R^{top}(\omega^2+1,k+2)\leq\omega^{\omega\cdot k}+1$ for all finite $k$.
Our computations use a variety of techniques, including a topological
pigeonhole principle for ordinals, considerations of a tree ordering based on
the Cantor normal form of ordinals, and some ultrafilter arguments.
|
[{'version': 'v1', 'created': 'Wed, 30 Sep 2015 23:44:33 GMT'}
{'version': 'v2', 'created': 'Tue, 12 Jul 2016 21:14:01 GMT'}
{'version': 'v3', 'created': 'Sun, 9 Apr 2017 04:33:26 GMT'}]
|
2017-07-20
|
[array(['Caicedo', 'Andrés Eduardo', ''], dtype=object)
array(['Hilton', 'Jacob', ''], dtype=object)]
|
3,325 |
cs/0607114
|
Martin Ziegler
|
Martin Ziegler
|
Revising Type-2 Computation and Degrees of Discontinuity
|
to appear in Proc. CCA'06
|
Electronic Notes in Theoretical Computer Science vol.167
(Jan.2007)
|
10.1016/j.entcs.2006.08.015
| null |
cs.LO math.LO
| null |
By the sometimes so-called MAIN THEOREM of Recursive Analysis, every
computable real function is necessarily continuous. Weihrauch and Zheng
(TCS'2000), Brattka (MLQ'2005), and Ziegler (ToCS'2006) have considered
different relaxed notions of computability to cover also discontinuous
functions. The present work compares and unifies these approaches. This is
based on the concept of the JUMP of a representation: both a TTE-counterpart to
the well known recursion-theoretic jump on Kleene's Arithmetical Hierarchy of
hypercomputation: and a formalization of revising computation in the sense of
Shoenfield.
We also consider Markov and Banach/Mazur oracle-computation of discontinuous
fu nctions and characterize the computational power of Type-2 nondeterminism to
coincide with the first level of the Analytical Hierarchy.
|
[{'version': 'v1', 'created': 'Wed, 26 Jul 2006 06:07:22 GMT'}
{'version': 'v2', 'created': 'Tue, 12 Sep 2006 01:21:49 GMT'}]
|
2011-08-04
|
[array(['Ziegler', 'Martin', ''], dtype=object)]
|
3,326 |
1604.05805
|
Patrick Morris
|
Patrick W. Morris, Harshal Gupta, Zsofia Nagy, John C. Pearson, Volker
Ossenkopf-Okada, Edith Falgarone, Dariusz C. Lis, Maryvonne Gerin, Gary
Melnick, David A. Neufeld, Edwin A. Bergin
|
Herschel/HIFI Spectral Mapping of C$^+$, CH$^+$, and CH in Orion BN/KL:
The Prevailing Role of Ultraviolet Irradiation in CH$^+$ Formation
|
Accepted for publication in The Astrophysical Journal
| null |
10.3847/0004-637X/829/1/15
| null |
astro-ph.GA astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The CH$^+$ ion is a key species in the initial steps of interstellar carbon
chemistry. Its formation in diverse environments where it is observed is not
well understood, however, because the main production pathway is so endothermic
(4280 K) that it is unlikely to proceed at the typical temperatures of
molecular clouds. We investigation CH$^+$ formation with the first
velocity-resolved spectral mapping of the CH$^+$ $J=1-0, 2-1$ rotational
transitions, three sets of CH $\Lambda$-doubled triplet lines, $^{12}$C$^+$ and
$^{13}$C$^+$, and CH$_3$OH 835~GHz E-symmetry Q branch transitions, obtained
with Herschel/HIFI over $\approx$12 arcmin$^2$ centered on the Orion BN/KL
source. We present the spatial morphologies and kinematics, cloud boundary
conditions, excitation temperatures, column densities, and $^{12}$C$^+$ optical
depths. Emission from C$^+$, CH$^+$, and CH is indicated to arise in the
diluted gas, outside of the explosive, dense BN/KL outflow. Our models show
that UV-irradiation provides favorable conditions for steady-state production
of CH$^+$ in this environment. Surprisingly, no spatial or kinematic
correspondences of these species are found with H$_2$ S(1) emission tracing
shocked gas in the outflow. We propose that C$^+$ is being consumed by rapid
production of CO to explain the lack of C$^+$ and CH$^+$ in the outflow, and
that fluorescence provides the reservoir of H$_2$ excited to higher
ro-vibrational and rotational levels. Hence, in star-forming environments
containing sources of shocks and strong UV radiation, a description of CH$^+$
formation and excitation conditions is incomplete without including the
important --- possibly dominant --- role of UV irradiation.
|
[{'version': 'v1', 'created': 'Wed, 20 Apr 2016 03:47:26 GMT'}
{'version': 'v2', 'created': 'Thu, 21 Apr 2016 15:33:26 GMT'}
{'version': 'v3', 'created': 'Sat, 30 Apr 2016 14:38:12 GMT'}]
|
2016-09-21
|
[array(['Morris', 'Patrick W.', ''], dtype=object)
array(['Gupta', 'Harshal', ''], dtype=object)
array(['Nagy', 'Zsofia', ''], dtype=object)
array(['Pearson', 'John C.', ''], dtype=object)
array(['Ossenkopf-Okada', 'Volker', ''], dtype=object)
array(['Falgarone', 'Edith', ''], dtype=object)
array(['Lis', 'Dariusz C.', ''], dtype=object)
array(['Gerin', 'Maryvonne', ''], dtype=object)
array(['Melnick', 'Gary', ''], dtype=object)
array(['Neufeld', 'David A.', ''], dtype=object)
array(['Bergin', 'Edwin A.', ''], dtype=object)]
|
3,327 |
0910.1776
|
Bo Sun
|
B. Sun and M. S. Pindzola
|
Observing collapse in two colliding dipolar Bose-Einstein condensates
|
6 pages, 7 figures
|
J. Phys. B: At. Mol. Opt. Phys. 42 No 17 (14 September 2009)
175301
|
10.1088/0953-4075/42/17/175301
| null |
cond-mat.stat-mech cond-mat.quant-gas
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the collision of two Bose-Einstein condensates with pure dipolar
interaction. A stationary pure dipolar condensate is known to be stable when
the atom number is below a critical value. However, collapse can occur during
the collision between two condensates due to local density fluctuations even if
the total atom number is only a fraction of the critical value. Using full
three-dimensional numerical simulations, we observe the collapse induced by
local density fluctuations. For the purpose of future experiments, we present
the time dependence of the density distribution, energy per particle and the
maximal density of the condensate. We also discuss the collapse time as a
function of the relative phase between the two condensates.
|
[{'version': 'v1', 'created': 'Fri, 9 Oct 2009 15:16:43 GMT'}]
|
2009-10-12
|
[array(['Sun', 'B.', ''], dtype=object)
array(['Pindzola', 'M. S.', ''], dtype=object)]
|
3,328 |
1903.04114
|
Anthony Bahri
|
A. Bahri, M. Bendersky and F.R. Cohen
|
Polyhedral products and features of their homotopy theory
|
A submission to the forthcoming Handbook of Homotopy Theory
| null | null | null |
math.AT math.AC math.CO math.HO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A polyhedral product is a natural subspace of a Cartesian product that is
specified by a simplicial complex. The modern formalism arose as a
generalization of the spaces known as moment-angle complexes which were
developed within the nascent subject of toric topology. This field, which began
as a topological approach to toric geometry and aspects of symplectic geometry,
has expanded rapidly in recent years. The investigation of polyhedral products
and their homotopy theoretic properties has developed to the point where they
are studied in various fields of mathematics far removed from their origin. In
this survey, we provide a brief historical overview of the development of this
subject, summarize many of the main results and describe applications.
|
[{'version': 'v1', 'created': 'Mon, 11 Mar 2019 03:36:42 GMT'}]
|
2019-03-12
|
[array(['Bahri', 'A.', ''], dtype=object)
array(['Bendersky', 'M.', ''], dtype=object)
array(['Cohen', 'F. R.', ''], dtype=object)]
|
3,329 |
2207.12169
|
Benjamin Martin
|
Benjamin Martin
|
Algebraic groups and $G$-complete reducibility: a geometric approach
|
Notes based on lectures given at the International Workshop on
"Algorithmic problems in group theory, and related areas", held at the Oasis
Summer Camp near Novosibirsk from July 26 to August 4, 2016. 28 pages
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The notion of a \emph{$G$-completely reducible} subgroup is important in the
study of algebraic groups and their subgroup structure. It generalizes the
usual idea of complete reducibility from representation theory: a subgroup $H$
of a general linear group $G= {\rm GL}_n(k)$ is $G$-completely reducible if and
only if the inclusion map $i\colon H\rightarrow {\rm GL}_n(k)$ is a completely
reducible representation of $H$. In these notes I give an introduction to the
theory of complete reducibility and its applications, and explain an approach
to the subject using geometric invariant theory.
|
[{'version': 'v1', 'created': 'Mon, 25 Jul 2022 13:11:46 GMT'}]
|
2022-07-26
|
[array(['Martin', 'Benjamin', ''], dtype=object)]
|
3,330 |
0805.3887
|
Diego Guadagnoli
|
Andrzej J. Buras, Diego Guadagnoli
|
Correlations among new CP violating effects in Delta F = 2 observables
|
8 pages, 5 figures, 2 tables. v2: additional negative correction to
epsilon_K included, other input updated, numerics slightly changed.
Conclusions unchanged. References added
|
Phys.Rev.D78:033005,2008
|
10.1103/PhysRevD.78.033005
|
TUM-HEP-688/08
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We point out that the observed CP violation in Bd - bar{Bd} mixing, taking
into account the measured ratio Delta Md / Delta Ms, the recently improved
lattice value of the non-perturbative parameter BK and an additional effective
suppression factor kappa_epsilon ~= 0.92 in epsilon_K neglected sofar in most
analyses, may be insufficient to describe the measured value of epsilon_K
within the Standard Model (SM), thus hinting at new CP violating contributions
to the K - bar{K} and/or Bd - bar{Bd} systems. Furthermore, assuming that Delta
Md / Delta Ms is SM-like, the signs and the magnitudes of new physics effects
in epsilon_K and in the CP asymmetries S_{psi Ks} and S_{psi phi} may turn out
to be correlated. For example, in a scenario with new CP-phases in Bd and Bs
mixings being approximately equal and negative, a common new phase ~= - 5
degrees could remove the tension between epsilon_K and S_{psi Ks} present in
the SM and simultaneously accommodate, at least partly, the recent claim of
S_{psi phi} being much larger than the SM expectation. We emphasize the
importance of precise determinations of Vcb, BK, FK and xi_s, to which the
parameter epsilon_K and its correlation with the CP violation in the Bd -
bar{Bd} system are very sensitive.
|
[{'version': 'v1', 'created': 'Mon, 26 May 2008 16:28:01 GMT'}
{'version': 'v2', 'created': 'Fri, 6 Jun 2008 18:52:12 GMT'}]
|
2008-11-26
|
[array(['Buras', 'Andrzej J.', ''], dtype=object)
array(['Guadagnoli', 'Diego', ''], dtype=object)]
|
3,331 |
1106.3705
|
Giorgi Japaridze
|
Giorgi Japaridze
|
The taming of recurrences in computability logic through cirquent
calculus, Part II
| null |
Archive for Mathematical Logic 52 (2013), pp. 213-259
|
10.1007/s00153-012-0314-7
| null |
cs.LO math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper constructs a cirquent calculus system and proves its soundness and
completeness with respect to the semantics of computability logic (see
http://www.cis.upenn.edu/~giorgi/cl.html). The logical vocabulary of the system
consists of negation, parallel conjunction, parallel disjunction, branching
recurrence, and branching corecurrence. The article is published in two parts,
with (the previous) Part I containing preliminaries and a soundness proof, and
(the present) Part II containing a completeness proof.
|
[{'version': 'v1', 'created': 'Sun, 19 Jun 2011 04:34:11 GMT'}]
|
2013-02-05
|
[array(['Japaridze', 'Giorgi', ''], dtype=object)]
|
3,332 |
hep-ex/9904025
|
Ilya Narsky
|
Ilya Narsky (Physics Dept, Southern Methodist U, Dallas, USA)
|
Estimation of Upper Limits Using a Poisson Statistic
|
24 pages, 7 figures
|
Nucl.Instrum.Meth.A450:444-455,2000
|
10.1016/S0168-9002(00)00305-3
|
Southern Methodist Univ preprint 99-05
|
hep-ex
| null |
Bayesian, classical, and extended maximum likelihood approaches to estimation
of upper limits in experiments with small numbers of signal events are
surveyed. The discussion covers only experiments whose outcomes are well
described by a Poisson statistic. A new approach, based on the statistical
significance of a signal rather than on the number of events in the signal
region, is proposed. A toy model and an example of a recent search for the
lepton number violating decay $\tau\to\mu\gamma$ are used to illustrate
application of the discussed techniques.
|
[{'version': 'v1', 'created': 'Fri, 23 Apr 1999 20:22:00 GMT'}]
|
2011-07-19
|
[array(['Narsky', 'Ilya', '',
'Physics Dept, Southern Methodist U, Dallas, USA'], dtype=object)]
|
3,333 |
1808.04758
|
James Cussens
|
James Cussens
|
Finding Minimal Cost Herbrand Models with Branch-Cut-and-Price
| null | null | null | null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Given (1) a set of clauses $T$ in some first-order language $\cal L$ and (2)
a cost function $c : B_{{\cal L}} \rightarrow \mathbb{R}_{+}$, mapping each
ground atom in the Herbrand base $B_{{\cal L}}$ to a non-negative real, then
the problem of finding a minimal cost Herbrand model is to either find a
Herbrand model $\cal I$ of $T$ which is guaranteed to minimise the sum of the
costs of true ground atoms, or establish that there is no Herbrand model for
$T$. A branch-cut-and-price integer programming (IP) approach to solving this
problem is presented. Since the number of ground instantiations of clauses and
the size of the Herbrand base are both infinite in general, we add the
corresponding IP constraints and IP variables `on the fly' via `cutting' and
`pricing' respectively. In the special case of a finite Herbrand base we show
that adding all IP variables and constraints from the outset can be
advantageous, showing that a challenging Markov logic network MAP problem can
be solved in this way if encoded appropriately.
|
[{'version': 'v1', 'created': 'Tue, 14 Aug 2018 15:45:01 GMT'}]
|
2018-08-15
|
[array(['Cussens', 'James', ''], dtype=object)]
|
3,334 |
1705.07068
|
Alessio Martini
|
Valentina Casarino, Paolo Ciatti and Alessio Martini
|
From refined estimates for spherical harmonics to a sharp multiplier
theorem on the Grushin sphere
|
32 pages
|
Advances in Mathematics, 350 (2019), p. 816-859
|
10.1016/j.aim.2019.05.003
| null |
math.AP math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove a sharp multiplier theorem of Mihlin-H\"ormander type for the
Grushin operator on the unit sphere in $\mathbb{R}^3$, and a corresponding
boundedness result for the associated Bochner-Riesz means. The proof hinges on
precise pointwise bounds for spherical harmonics.
|
[{'version': 'v1', 'created': 'Fri, 19 May 2017 16:14:24 GMT'}
{'version': 'v2', 'created': 'Sat, 7 Oct 2017 14:21:57 GMT'}
{'version': 'v3', 'created': 'Mon, 29 Apr 2019 09:45:52 GMT'}]
|
2019-08-15
|
[array(['Casarino', 'Valentina', ''], dtype=object)
array(['Ciatti', 'Paolo', ''], dtype=object)
array(['Martini', 'Alessio', ''], dtype=object)]
|
3,335 |
1907.00509
|
Justin Slepak
|
Justin Slepak, Olin Shivers, Panagiotis Manolios
|
The Semantics of Rank Polymorphism
| null | null | null | null |
cs.PL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Iverson's APL and its descendants (such as J, K and FISh) are examples of the
family of "rank-polymorphic" programming languages. The principal control
mechanism of such languages is the general lifting of functions that operate on
arrays of rank (or dimension) $r$ to operate on arrays of any higher rank $r' >
r$. We present a core, functional language, Remora, that captures this
mechanism, and develop both a formal, dynamic semantics for the language, and
an accompanying static, rank-polymorphic type system for the language.
Critically, the static semantics captures the shape-based lifting mechanism of
the language. We establish the usual progress and preservation properties for
the type system, showing that it is sound, which means that "array shape"
errors cannot occur at run time in a well-typed program. Our type system uses
dependent types, including an existential type abstraction which permits
programs to operate on arrays whose shape or rank is computed dynamically;
however, it is restricted enough to permit static type checking.
The rank-polymorphic computational paradigm is unusual in that the types of
arguments affect the dynamic execution of the program -- they are what drive
the rank-polymorphic distribution of a function across arrays of higher rank.
To highlight this property, we additionally present a dynamic semantics for a
partially erased variant of the fully-typed language and show that a
computation performed with a fully-typed term stays in lock step with the
computation performed with its partially erased term. The residual types thus
precisely characterise the type information that is needed by the dynamic
semantics, a property useful for the (eventual) construction of efficient
compilers for rank-polymorphic languages.
|
[{'version': 'v1', 'created': 'Mon, 1 Jul 2019 01:42:53 GMT'}]
|
2019-07-02
|
[array(['Slepak', 'Justin', ''], dtype=object)
array(['Shivers', 'Olin', ''], dtype=object)
array(['Manolios', 'Panagiotis', ''], dtype=object)]
|
3,336 |
astro-ph/0510501
|
Jens Kauffmann
|
Jens Kauffmann (1), Frank Bertoldi (2), Neal.J. Evans II (3) and the
c2d Collaboration ((1) Max-Planck-Institut fuer Radioastronomie, (2)
Radioastronomisches Institut der Universitaet Bonn, (3) Department of
Astronomy at the University of Texas at Austin)
|
Spitzer Discovery of Very Low Luminosity Objects
|
4 pages, 4 figures. Accepted for the Astronomical Notes for the
special issue containing the proceedings of the "Ultra low-mass star
formation and evolution" workshop
| null |
10.1002/asna.200310446
| null |
astro-ph
| null |
The Spitzer Space Telescope allows for the first time to search
systematically for very low luminosity (= 0.1 L_sun) objects (VeLLOs)
associated with dense molecular cores. They may be the first candidate Class 0
sources with sub-stellar masses. We describe such a source in the dense
molecular core L1148. VeLLO natal cores show properties that are unusual for
star-forming cores. The low luminosity and in some cases the lack of prominent
outflow could be the result of the small gas supply near the VeLLO.
|
[{'version': 'v1', 'created': 'Mon, 17 Oct 2005 20:37:57 GMT'}]
|
2009-11-11
|
[array(['Kauffmann', 'Jens', ''], dtype=object)
array(['Bertoldi', 'Frank', ''], dtype=object)
array(['Evans', 'Neal. J.', 'II'], dtype=object)
array(['Collaboration', 'the c2d', ''], dtype=object)]
|
3,337 |
2302.13578
|
Fabian Woitschek
|
Fabian Woitschek, Georg Schneider
|
Online Black-Box Confidence Estimation of Deep Neural Networks
| null |
2022 IEEE Intelligent Vehicles Symposium (IV), Aachen, Germany,
2022, pp. 183-189
|
10.1109/IV51971.2022.9827314
| null |
cs.CV cs.AI cs.LG
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Autonomous driving (AD) and advanced driver assistance systems (ADAS)
increasingly utilize deep neural networks (DNNs) for improved perception or
planning. Nevertheless, DNNs are quite brittle when the data distribution
during inference deviates from the data distribution during training. This
represents a challenge when deploying in partly unknown environments like in
the case of ADAS. At the same time, the standard confidence of DNNs remains
high even if the classification reliability decreases. This is problematic
since following motion control algorithms consider the apparently confident
prediction as reliable even though it might be considerably wrong. To reduce
this problem real-time capable confidence estimation is required that better
aligns with the actual reliability of the DNN classification. Additionally, the
need exists for black-box confidence estimation to enable the homogeneous
inclusion of externally developed components to an entire system. In this work
we explore this use case and introduce the neighborhood confidence (NHC) which
estimates the confidence of an arbitrary DNN for classification. The metric can
be used for black-box systems since only the top-1 class output is required and
does not need access to the gradients, the training dataset or a hold-out
validation dataset. Evaluation on different data distributions, including small
in-domain distribution shifts, out-of-domain data or adversarial attacks, shows
that the NHC performs better or on par with a comparable method for online
white-box confidence estimation in low data regimes which is required for
real-time capable AD/ADAS.
|
[{'version': 'v1', 'created': 'Mon, 27 Feb 2023 08:30:46 GMT'}]
|
2023-03-10
|
[array(['Woitschek', 'Fabian', ''], dtype=object)
array(['Schneider', 'Georg', ''], dtype=object)]
|
3,338 |
1412.0270
|
Pietro d'Avenia
|
Pietro d'Avenia, Marco Squassina, Marianna Zenari
|
Fractional logarithmic Schr\"odinger equations
|
10 pages
| null | null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By means of non-smooth critical point theory we obtain existence of
infinitely many weak solutions of the fractional Schr\"odinger equation with
logarithmic nonlinearity. We also investigate the H\"older regularity of the
weak solutions.
|
[{'version': 'v1', 'created': 'Sun, 30 Nov 2014 19:51:51 GMT'}]
|
2014-12-02
|
[array(["d'Avenia", 'Pietro', ''], dtype=object)
array(['Squassina', 'Marco', ''], dtype=object)
array(['Zenari', 'Marianna', ''], dtype=object)]
|
3,339 |
1904.08125
|
Pascu Catalin Moca
|
C\u{a}t\u{a}lin Pa\c{s}cu Moca, Chirla Razvan, Bal\'azs D\'ora,
Gergely Z\'arand
|
Quantum criticality and formation of a singular Fermi liquid in the
attractive SU(N > 2) Anderson model
|
5 pages, 4 figures, includes Supplemental Information
|
Phys. Rev. Lett. 123, 136803 (2019)
|
10.1103/PhysRevLett.123.136803
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
While much is known about repulsive quantum impurity models, significantly
less attention has been devoted to their attractive counterparts. This
motivated us to study the attractive SU(N) Anderson impurity model. While for
the repulsive case, the phase diagram features mild N dependence and the ground
state is always a Fermi liquid, in the attractive case a Kosterlitz-Thouless
charge localization phase transition is revealed for N > 2. Beyond a critical
value of attractive interaction an abrupt jump appears in the number of
particles at the impurity site, and a singular Fermi liquid state emerges,
where the scattering of quasiparticles is found to exhibit power law behavior
with fractional power. The capacity diverges exponentially at the quantum
critical point, signaling the Kosterlitz-Thouless transition.
|
[{'version': 'v1', 'created': 'Wed, 17 Apr 2019 08:23:36 GMT'}
{'version': 'v2', 'created': 'Thu, 26 Sep 2019 17:03:56 GMT'}]
|
2019-09-27
|
[array(['Moca', 'Cătălin Paşcu', ''], dtype=object)
array(['Razvan', 'Chirla', ''], dtype=object)
array(['Dóra', 'Balázs', ''], dtype=object)
array(['Zárand', 'Gergely', ''], dtype=object)]
|
3,340 |
nucl-ex/9909001
|
L. Evan Finch
|
E864 Collaboration: T. A. Armstrong, et al
|
Measurements of Neutrons in 11.5 A GeV/c Au+Pb Heavy Ion Collisions
|
21 pages, submitted to PRC
|
Phys.Rev.C60:064903,1999
|
10.1103/PhysRevC.60.064903
| null |
nucl-ex
| null |
We present measurements from Brookhaven Experiment 864 of neutron invariant
multiplicity in 11.5 A GeV/c Au+Pb collisions. The measurements span a rapidity
range from center-of-mass to beam rapidity (y(beam)=3.2) and are presented as a
function of event centrality. The results are compared with E864 measurements
of proton invariant multiplicity and an average n/p ratio at hadronic
freeze-out of 1.19+-.08 is determined for the rapidity range y=1.6 to y=2.4. We
discuss briefly the implications of this ratio within a simple equilibrium
model of the collision system.
|
[{'version': 'v1', 'created': 'Thu, 2 Sep 1999 18:09:33 GMT'}]
|
2011-08-19
|
[array(['E864 Collaboration', '', ''], dtype=object)
array(['Armstrong', 'T. A.', ''], dtype=object)]
|
3,341 |
1603.05773
|
Leonardo Robol
|
Leonardo Robol, Raf Vandebril and Paul Van Dooren
|
A framework for structured linearizations of matrix polynomials in
various bases
| null | null | null | null |
math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a framework for the construction of linearizations for scalar and
matrix polynomials based on dual bases which, in the case of orthogonal
polynomials, can be described by the associated recurrence relations. The
framework provides an extension of the classical linearization theory for
polynomials expressed in non-monomial bases and allows to represent polynomials
expressed in product families, that is as a linear combination of elements of
the form $\phi_i(\lambda) \psi_j(\lambda)$, where $\{ \phi_i(\lambda) \}$ and
$\{ \psi_j(\lambda) \}$ can either be polynomial bases or polynomial families
which satisfy some mild assumptions. We show that this general construction can
be used for many different purposes. Among them, we show how to linearize sums
of polynomials and rational functions expressed in different bases. As an
example, this allows to look for intersections of functions interpolated on
different nodes without converting them to the same basis. We then provide some
constructions for structured linearizations for $\star$-even and
$\star$-palindromic matrix polynomials. The extensions of these constructions
to $\star$-odd and $\star$-antipalindromic of odd degree is discussed and
follows immediately from the previous results.
|
[{'version': 'v1', 'created': 'Fri, 18 Mar 2016 06:08:31 GMT'}
{'version': 'v2', 'created': 'Tue, 5 Jul 2016 14:17:16 GMT'}]
|
2016-07-06
|
[array(['Robol', 'Leonardo', ''], dtype=object)
array(['Vandebril', 'Raf', ''], dtype=object)
array(['Van Dooren', 'Paul', ''], dtype=object)]
|
3,342 |
0905.0580
|
Arjun Bagchi
|
Arjun Bagchi, Ipsita Mandal
|
Supersymmetric Extension of Galilean Conformal Algebras
|
19 pages; v2: 20 pages, Appendix on OPEs added, other minor changes,
references added
|
Phys.Rev.D80:086011,2009
|
10.1103/PhysRevD.80.086011
|
HRI/ST/0913
|
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Galilean conformal algebra has recently been realised in the study of the
non-relativistic limit of the AdS/CFT conjecture. This was obtained by a
systematic parametric group contraction of the parent relativistic conformal
field theory. In this paper, we extend the analysis to include supersymmetry.
We work at the level of the co-ordinates in superspace to construct the N=1
Super Galilean conformal algebra. One of the interesting outcomes of the
analysis is that one is able to naturally extend the finite algebra to an
infinite one. This looks structurally similar to the N=1 superconformal algebra
in two dimensions, but is different. We also comment on the extension of our
construction to cases of higher $N$.
|
[{'version': 'v1', 'created': 'Tue, 5 May 2009 17:46:31 GMT'}
{'version': 'v2', 'created': 'Tue, 7 Jul 2009 08:36:55 GMT'}]
|
2009-11-05
|
[array(['Bagchi', 'Arjun', ''], dtype=object)
array(['Mandal', 'Ipsita', ''], dtype=object)]
|
3,343 |
cond-mat/0302153
|
Anthore
|
A. Anthore, H. Pothier, and D. Esteve (CEA-Saclay, France)
|
Density of states in a superconductor carrying a supercurrent
|
To be published in Physical Review Letters
|
Phys. Rev. Lett. 90, 127001 (2003)
|
10.1103/PhysRevLett.90.127001
| null |
cond-mat.supr-con cond-mat.mes-hall
| null |
We have measured the tunneling density of states (DOS) in a superconductor
carrying a supercurrent or exposed to an external magnetic field. The pair
correlations are weakened by the supercurrent, leading to a modification of the
DOS and to a reduction of the gap. As predicted by the theory of
superconductivity in diffusive metals, we find that this effect is similar to
that of an external magnetic field.
|
[{'version': 'v1', 'created': 'Fri, 7 Feb 2003 15:29:19 GMT'}]
|
2009-11-10
|
[array(['Anthore', 'A.', '', 'CEA-Saclay, France'], dtype=object)
array(['Pothier', 'H.', '', 'CEA-Saclay, France'], dtype=object)
array(['Esteve', 'D.', '', 'CEA-Saclay, France'], dtype=object)]
|
3,344 |
1502.03127
|
Huixia Luo Huixia Luo
|
Huixia Luo, Jason W. Krizan, Lukas Muechler, Neel Haldolaarachchige,
Tomasz Klimczuk, Weiwei Xie, Michael K. Fuccillo, Claudia Felser and Robert
J. Cava
|
A large new family of filled skutterudites stabilized by electron count
|
A revised version with the title"A large family of filled
skutterudites stabilized by electron count"will appear in Nature
Communications
| null |
10.1038/ncomms7489
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on the interplay of theory and experiment, a large new family of filled
group 9 (Co, Rh and Ir) skutterudites is designed and synthesized. The new
materials fill the empty cages in the structures of the known binary CoSb3,
RhSb3 and IrSb3 skutterudites with alkaline, alkaline earth, and rare earth
atoms to create compounds of the type AyB4X12; A atoms fill the cages to a
fraction y, B are the group 9 transition metals, and X is a mixture of
electronegative main group elements chosen to achieve chemical stability by
adjusting the electron counts to electron-precise values. Forty-three new
compounds are reported, antimony-tin and phosphorous-silicon based, with 63
compositional variations presented. The new family of compounds is large and
general. The results described here can be extended to the synthesis of
hundreds of new group 9 filled skutterudites.
|
[{'version': 'v1', 'created': 'Tue, 10 Feb 2015 21:30:00 GMT'}
{'version': 'v2', 'created': 'Thu, 12 Feb 2015 15:44:03 GMT'}]
|
2015-06-23
|
[array(['Luo', 'Huixia', ''], dtype=object)
array(['Krizan', 'Jason W.', ''], dtype=object)
array(['Muechler', 'Lukas', ''], dtype=object)
array(['Haldolaarachchige', 'Neel', ''], dtype=object)
array(['Klimczuk', 'Tomasz', ''], dtype=object)
array(['Xie', 'Weiwei', ''], dtype=object)
array(['Fuccillo', 'Michael K.', ''], dtype=object)
array(['Felser', 'Claudia', ''], dtype=object)
array(['Cava', 'Robert J.', ''], dtype=object)]
|
3,345 |
1104.3004
|
Andrea Iannuzzi
|
Andrea Iannuzzi
|
On hyperbolicity of SU(2)-equivariant, punctured disc bundles over the
complex affine quadric
|
15 pages, v2: minor changes, to appear in Transformation Groups
| null |
10.1007/s00031-011-9167-0
| null |
math.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Given a holomorphic line bundle over the complex affine quadric $Q^2$, we
investigate its Stein, SU(2)-equivariant disc bundles. Up to equivariant
biholomorphism, these are all contained in a maximal one, say $\Omega_{max}$.
By removing the zero section to $\Omega_{max}$ one obtains the unique Stein,
SU(2)-equivariant, punctured disc bundle over $Q^2$ which contains entire
curves. All other such punctured disc bundles are shown to be Kobayashi
hyperbolic.
|
[{'version': 'v1', 'created': 'Fri, 15 Apr 2011 10:08:44 GMT'}
{'version': 'v2', 'created': 'Wed, 7 Mar 2012 16:13:17 GMT'}]
|
2012-03-08
|
[array(['Iannuzzi', 'Andrea', ''], dtype=object)]
|
3,346 |
1303.6009
|
Keyu Xia
|
Keyu Xia, M. Alamri, M. Suhail Zubairy
|
Ultrabroadband nonreciprocal transverse energy flow of light in linear
passive photonic circuits
|
13 pages, 22 figures
|
Optics Express, Vol. 21, Issue 22, pp. 25619-25631 (2013)
|
10.1364/OE.21.025619
| null |
quant-ph physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using a technique, analogous to coherent population trapping in an atomic
system, we propose schemes to create transverse light propagation violating
left-right symmetry in a photonic circuit consisting of three coupled
waveguides. The frequency windows for the symmetry breaking of the left-right
energy flow span over 80 nm. Our proposed system only uses linear passive
optical materials and is easy to integrate on a chip.
|
[{'version': 'v1', 'created': 'Mon, 25 Mar 2013 00:51:35 GMT'}
{'version': 'v2', 'created': 'Fri, 1 Nov 2013 02:25:59 GMT'}]
|
2013-11-04
|
[array(['Xia', 'Keyu', ''], dtype=object)
array(['Alamri', 'M.', ''], dtype=object)
array(['Zubairy', 'M. Suhail', ''], dtype=object)]
|
3,347 |
1411.2605
|
Gianguido Dall'Agata
|
Gianguido Dall'Agata and Fabio Zwirner
|
On sgoldstino-less supergravity models of inflation
|
19 pages. v2: references added and few minor changes to the text. v3:
published version
| null |
10.1007/JHEP12(2014)172
|
CERN-PH-TH-2014-199, DFPD-2014/TH/16
|
hep-th astro-ph.CO hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We go a step further in the search for a consistent and realistic
supergravity model of large-field inflation by building a class of models with
the following features: during slow-roll, all the scalar fields other than the
inflaton are frozen by large inflaton-dependent masses or removed from the
spectrum; at the end of inflation, supersymmetry is spontaneously broken with
naturally vanishing classical vacuum energy. We achieve this by combining some
geometrical properties of the Kaehler potential with the consistent use of a
single nilpotent chiral superfield, in one-to-one correspondence with the
supersymmetry-breaking direction in field space at the vacuum.
|
[{'version': 'v1', 'created': 'Mon, 10 Nov 2014 21:02:15 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Nov 2014 18:44:35 GMT'}
{'version': 'v3', 'created': 'Mon, 29 Dec 2014 16:24:32 GMT'}]
|
2015-06-23
|
[array(["Dall'Agata", 'Gianguido', ''], dtype=object)
array(['Zwirner', 'Fabio', ''], dtype=object)]
|
3,348 |
1503.01316
|
Ali \"Ovg\"un
|
I. Sakalli, A. Ovgun
|
Hawking Radiation of Spin-1 Particles From Three Dimensional Rotating
Hairy Black Hole
|
minor corrections, corrected typos
|
J.Exp.Theor.Phys, 121 (2015), 3, 404-407
|
10.1134/S1063776115090113
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the present article, we study the Hawking radiation (HR) of spin-1
particles -- so-called vector particles -- from a three dimensional (3D)
rotating black hole with scalar hair (RBHWSH) using Hamilton-Jacobi (HJ)
ansatz. Putting the Proca equation amalgamated with the WKB approximation in
process, the tunneling spectrum of vector particles is obtained. We recover the
standard Hawking temperature corresponding to the emission of these particles
from RBHWSH.
|
[{'version': 'v1', 'created': 'Wed, 4 Mar 2015 14:30:17 GMT'}
{'version': 'v2', 'created': 'Tue, 24 Nov 2015 14:19:12 GMT'}]
|
2015-11-25
|
[array(['Sakalli', 'I.', ''], dtype=object)
array(['Ovgun', 'A.', ''], dtype=object)]
|
3,349 |
1112.1341
|
Felipe Falciano
|
F. T. Falciano and E. Goulart
|
A new symmetry of the relativistic wave equation
|
4 pages
|
Class.Quant.Grav. 29 (2012) 085011
|
10.1088/0264-9381/29/8/085011
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we show that there exists a new symmetry in the relativistic
wave equation for a scalar field in arbitrary dimensions. This symmetry is
related to redefinitions of the metric tensor which implement a map between
non-equivalent manifolds. It is possible to interpret these transformations as
a generalization of the conformal transformations. In addition, one can show
that this set of manifolds together with the transformation connecting its
metrics forms a group. As long as the scalar field dynamics is invariant under
these transformations, there immediately appears an ambiguity concerning the
definition of the underlying background geometry.
|
[{'version': 'v1', 'created': 'Tue, 6 Dec 2011 16:38:41 GMT'}]
|
2012-08-29
|
[array(['Falciano', 'F. T.', ''], dtype=object)
array(['Goulart', 'E.', ''], dtype=object)]
|
3,350 |
hep-th/0107079
|
Jose M. F. Labastida
|
Jose M. F. Labastida
|
Math and Physics
|
latex, 20 pages, talk delivered at the special seminar in honor of F.
J. Yndurain
| null | null | null |
hep-th math-ph math.MP
| null |
I present a brief review on some of the recent developments in topological
quantum field theory. These include topological string theory, topological
Yang-Mills theory and Chern-Simons gauge theory. It is emphasized how the
application of different field and string theory methods has led to important
progress, opening entirely new points of view in the context of Gromov-Witten
invariants, Donaldson invariants, and quantum-group invariants for knots and
links.
|
[{'version': 'v1', 'created': 'Tue, 10 Jul 2001 13:24:51 GMT'}]
|
2007-05-23
|
[array(['Labastida', 'Jose M. F.', ''], dtype=object)]
|
3,351 |
1811.09519
|
Jonas W\"atzel
|
Jonas W\"atzel and Jamal Berakdar
|
All-Optical Generation and Tuning of Ultrafast Spin-Hall Current via
Optical Vortices
|
12 pages, 6 figures
|
Scientific Reports 8, 17102 (2018)
|
10.1038/s41598-018-35378-4
| null |
cond-mat.mes-hall quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Spin Hall effect, one of the cornerstones in spintronics refers to the
emergence of an imbalance in the spin density transverse to a charge flow in a
sample under voltage bias. This study points to a novel way for an ultrafast
generation and tuning of a unidirectional nonlinear spin Hall current by means
of subpicosecond laser pulses of optical vortices. When interacting with
matter, the optical orbital angular momentum (OAM) carried by the vortex and
quantified by its topological charge is transferred to the charge carriers. The
residual spin-orbital coupling in the sample together with confinement effects
allow exploiting the absorbed optical OAM for spatio-temporally controlling the
spin channels. Both the non-linear spin Hall current and the dynamical spin
Hall angle increase for a higher optical topological charge. The reason is the
transfer of a higher amount of OAM and the enhancement of the effective
spin-orbit interaction strength. No bias voltage is needed. We demonstrate that
the spin Hall current can be all-optically generated in an open circuit
geometry for ring-structured samples. These results follow from a full-fledged
propagation of the spin-dependent quantum dynamics on a time-space grid coupled
to the phononic environment. The findings point to a versatile and controllable
tool for the ultrafast generation of spin accumulations with a variety of
applications such as a source for ultrafast spin transfer torque and charge and
spin current pulse emitter.
|
[{'version': 'v1', 'created': 'Fri, 23 Nov 2018 15:24:20 GMT'}]
|
2018-11-26
|
[array(['Wätzel', 'Jonas', ''], dtype=object)
array(['Berakdar', 'Jamal', ''], dtype=object)]
|
3,352 |
2001.10530
|
Tao Zhou
|
Tao Zhou, Quanhui Liu, Zimo Yang, Jingyi Liao, Kexin Yang, Wei Bai,
Xin L\"u, Wei Zhang
|
Preliminary prediction of the basic reproduction number of the Wuhan
novel coronavirus 2019-nCoV
|
8 pages, 1 table and 1 figure
|
Journal of Evidence Based Medicine (2020) 1
|
10.1111/jebm.12376
| null |
q-bio.PE physics.soc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Objectives.--To estimate the basic reproduction number of the Wuhan novel
coronavirus (2019-nCoV). Methods.--Based on the
susceptible-exposed-infected-removed (SEIR) compartment model and the
assumption that the infectious cases with symptoms occurred before January 25,
2020 are resulted from free propagation without intervention, we estimate the
basic reproduction number of 2019-nCoV according to the reported confirmed
cases and suspected cases, as well as the theoretical estimated number of
infected cases by other research teams, together with some epidemiological
determinants learned from the severe acute respiratory syndrome. Results The
basic reproduction number falls between 2.8 to 3.3 by using the real-time
reports on the number of 2019-nCoV infected cases from People's Daily in China,
and falls between 3.2 and 3.9 on the basis of the predicted number of infected
cases from colleagues. Conclusions.--The early transmission ability of
2019-nCoV is closed to or slightly higher than SARS. It is a controllable
disease with moderate-high transmissibility. Timely and effective control
measures are needed to suppress the further transmissions. Notes Added.--Using
a newly reported epidemiological determinants for early 2019-nCoV, the
estimated basic reproduction number is in the range [2.2,3.0].
|
[{'version': 'v1', 'created': 'Tue, 28 Jan 2020 08:15:02 GMT'}
{'version': 'v2', 'created': 'Fri, 31 Jan 2020 14:53:50 GMT'}]
|
2020-03-03
|
[array(['Zhou', 'Tao', ''], dtype=object)
array(['Liu', 'Quanhui', ''], dtype=object)
array(['Yang', 'Zimo', ''], dtype=object)
array(['Liao', 'Jingyi', ''], dtype=object)
array(['Yang', 'Kexin', ''], dtype=object)
array(['Bai', 'Wei', ''], dtype=object)
array(['Lü', 'Xin', ''], dtype=object)
array(['Zhang', 'Wei', ''], dtype=object)]
|
3,353 |
1102.1013
|
Diederik Kruijssen
|
J. M. Diederik Kruijssen, F. Inti Pelupessy, Henny J. G. L. M. Lamers,
Simon F. Portegies Zwart, Vincent Icke
|
Modeling the formation and evolution of star cluster populations in
galaxy simulations
|
28 pages, 18 figures, 2 tables; Accepted for publication in MNRAS
| null |
10.1111/j.1365-2966.2011.18467.x
| null |
astro-ph.CO astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
(Abridged) The formation and evolution of star cluster populations are
related to the galactic environment. Cluster formation is governed by processes
acting on galactic scales, and star cluster disruption is driven by the tidal
field. In this paper, we present a self-consistent model for the formation and
evolution of star cluster populations, for which we combine an N-body/SPH
galaxy evolution code with semi-analytic models for star cluster evolution. The
model includes star formation, feedback, stellar evolution, and star cluster
disruption by two-body relaxation and tidal shocks. We apply the model by
simulating a suite of 9 isolated disc galaxies and 24 galaxy mergers. The
evolutionary histories of individual clusters in these simulations are
discussed to illustrate how the environment of clusters changes in time and
space. The resulting variability of the disruption rate with time and space
affects the properties of star cluster populations. The combined effect of
clusters escaping their dense formation sites (`cluster migration') and the
preferential disruption of clusters residing in dense environments (`natural
selection') implies that the mean disruption rate of the population decreases
with cluster age. This affects the slope of the cluster age distribution, which
becomes a function of the star formation rate density. The evolutionary
histories of clusters in a galaxy merger vary widely and determine which
clusters survive the merger. This impacts the age distributions and the
locations of the surviving clusters at all times during a merger. We conclude
that accounting for the interplay between the formation, disruption, and
orbital histories of clusters enables a more sophisticated interpretation of
observed properties of cluster populations, thereby extending the role of
cluster populations as tracers of galaxy evolution.
|
[{'version': 'v1', 'created': 'Fri, 4 Feb 2011 21:00:01 GMT'}]
|
2015-05-27
|
[array(['Kruijssen', 'J. M. Diederik', ''], dtype=object)
array(['Pelupessy', 'F. Inti', ''], dtype=object)
array(['Lamers', 'Henny J. G. L. M.', ''], dtype=object)
array(['Zwart', 'Simon F. Portegies', ''], dtype=object)
array(['Icke', 'Vincent', ''], dtype=object)]
|
3,354 |
2102.10903
|
Matthew Alger
|
M. J. Alger, J. D. Livingston, N. M. McClure-Griffiths, J. L. Nabaglo,
O. I. Wong, C. S. Ong
|
Interpretable Faraday Complexity Classification
|
Accepted for publication in PASA
|
Publ. Astron. Soc. Aust. 38 (2021) e022
|
10.1017/pasa.2021.10
| null |
astro-ph.IM astro-ph.GA
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Faraday complexity describes whether a spectropolarimetric observation has
simple or complex magnetic structure. Quickly determining the Faraday
complexity of a spectropolarimetric observation is important for processing
large, polarised radio surveys. Finding simple sources lets us build rotation
measure grids, and finding complex sources lets us follow these sources up with
slower analysis techniques or further observations. We introduce five features
that can be used to train simple, interpretable machine learning classifiers
for estimating Faraday complexity. We train logistic regression and extreme
gradient boosted tree classifiers on simulated polarised spectra using our
features, analyse their behaviour, and demonstrate our features are effective
for both simulated and real data. This is the first application of machine
learning methods to real spectropolarimetry data. With 95 per cent accuracy on
simulated ASKAP data and 90 per cent accuracy on simulated ATCA data, our
method performs comparably to state-of-the-art convolutional neural networks
while being simpler and easier to interpret. Logistic regression trained with
our features behaves sensibly on real data and its outputs are useful for
sorting polarised sources by apparent Faraday complexity.
|
[{'version': 'v1', 'created': 'Mon, 22 Feb 2021 11:09:38 GMT'}]
|
2021-07-01
|
[array(['Alger', 'M. J.', ''], dtype=object)
array(['Livingston', 'J. D.', ''], dtype=object)
array(['McClure-Griffiths', 'N. M.', ''], dtype=object)
array(['Nabaglo', 'J. L.', ''], dtype=object)
array(['Wong', 'O. I.', ''], dtype=object)
array(['Ong', 'C. S.', ''], dtype=object)]
|
3,355 |
1804.10790
|
Majid Hashemi
|
Majid Hashemi, Mostafa MahdaviKhorrami
|
Analysis of b quark pair production signal from neutral 2HDM Higgs
bosons at future Linear Colliders
|
8 pages, 10 figures
| null |
10.1140/epjc/s10052-018-5962-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, the b quark pair production events are analyzed as a source of
neutral Higgs bosons of the two Higgs doublet model type I at linear colliders.
The production mechanism is e+e- -> Z/gamma -> HA -> bbbb assuming a fully
hadronic final state. The analysis aim is to identify both scalar and
pseudo-scalar Higgs bosons in different benchmark points accommodating moderate
boson masses. Due to pair production of Higgs bosons, the analysis is most
suitable for a linear collider operating at sqrt(s) = 1 TeV. Results show that
in selected benchmark points, signal peaks are observable in the b-jet pair
invariant mass distributions at integrated luminosity of 500 fb-1.
|
[{'version': 'v1', 'created': 'Sat, 28 Apr 2018 11:56:52 GMT'}
{'version': 'v2', 'created': 'Wed, 16 May 2018 06:56:55 GMT'}]
|
2018-07-04
|
[array(['Hashemi', 'Majid', ''], dtype=object)
array(['MahdaviKhorrami', 'Mostafa', ''], dtype=object)]
|
3,356 |
1501.06995
|
Eric DeGiuli
|
E. DeGiuli, E. Lerner, M. Wyart
|
Theory of the Jamming Transition at Finite Temperature
|
8 pages + 3 pages SI
|
J. Chem. Phys. 142, 164503 (2015)
|
10.1063/1.4918737
| null |
cond-mat.soft
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A theory for the microscopic structure and the vibrational properties of soft
sphere glass at finite temperature is presented. With an effective potential,
derived here, the phase diagram and vibrational properties are worked out
around the Maxwell critical point at zero temperature $T$ and pressure $p$.
Variational arguments and effective medium theory identically predict a
non-trivial temperature scale $T^*\sim p^{(2-a)/(1-a)}$ with $a \approx 0.17$
such that low-energy vibrational properties are hard-sphere like for $T \gtrsim
T^*$, and zero-temperature soft-sphere like otherwise. However, due to
crossovers in the equation of state relating $T$, $p$, and the packing fraction
$\phi$, these two regimes lead to four regions where scaling behaviors differ
when expressed in terms of $T$ and $\phi$. Scaling predictions are presented
for the mean-squared displacement, characteristic frequency, shear modulus, and
characteristic elastic length in all regions of the phase diagram.
|
[{'version': 'v1', 'created': 'Wed, 28 Jan 2015 05:56:05 GMT'}
{'version': 'v2', 'created': 'Fri, 10 Apr 2015 02:34:50 GMT'}]
|
2016-04-13
|
[array(['DeGiuli', 'E.', ''], dtype=object)
array(['Lerner', 'E.', ''], dtype=object)
array(['Wyart', 'M.', ''], dtype=object)]
|
3,357 |
hep-ph/9910275
|
Konstantin Matchev
|
Regina Demina (Kansas State U.), Joseph D. Lykken, Konstantin T.
Matchev (Fermilab) and Andrei Nomerotski (Florida U.)
|
Stop and Sbottom Searches in Run II of the Fermilab Tevatron
|
30 pages, LaTeX, 10 figures
|
Phys.Rev.D62:035011,2000
|
10.1103/PhysRevD.62.035011
|
FERMILAB-PUB-99/259-T
|
hep-ph hep-ex
| null |
We estimate the Tevatron Run II potential for top and bottom squark searches.
We find an impressive reach in several of the possible discovery channels. We
also study some new channels which may arise in non-conventional supersymmetry
models. In each case we rely on a detailed Monte Carlo simulation of the
collider events and the CDF detector performance in Run I.
|
[{'version': 'v1', 'created': 'Fri, 8 Oct 1999 20:49:19 GMT'}]
|
2009-10-09
|
[array(['Demina', 'Regina', '', 'Kansas State U.'], dtype=object)
array(['Lykken', 'Joseph D.', '', 'Fermilab'], dtype=object)
array(['Matchev', 'Konstantin T.', '', 'Fermilab'], dtype=object)
array(['Nomerotski', 'Andrei', '', 'Florida U.'], dtype=object)]
|
3,358 |
1704.07294
|
Sebastian Reineke
|
Caterin Salas Redondo, Paul Kleine, Karla Roszeitis, Tim Achenbach,
Martin Kroll, Michael Thomschke, and Sebastian Reineke
|
Interplay of Fluorescence and Phosphorescence in Organic Biluminescent
Emitters
|
45 pages, 10 figures (main manuscript and supplementary information)
| null |
10.1021/acs.jpcc.7b04529
| null |
physics.chem-ph physics.app-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Biluminescent organic emitters show simultaneous fluorescence and
phosphorescence at room temperature. So far, the optimization of the room
temperature phosphorescence (RTP) in these materials has drawn the attention of
research. However, the continuous wave operation of these emitters will
consequently turn them into systems with vastly imbalanced singlet and triplet
populations, which is due to the respective excited state lifetimes. This study
reports on the exciton dynamics of the biluminophore NPB
(N,N-di(1-naphthyl)-N,N-diphenyl-(1,1-biphenyl)-4,4-diamine). In the extreme
case, the singlet and triplet exciton lifetimes stretch from 3 ns to 300 ms,
respectively. Through sample engineering and oxygen quenching experiments, the
triplet exciton density can be controlled over several orders of magnitude
allowing to studying exciton interactions between singlet and triplet
manifolds. The results show, that singlet-triplet annihilation reduces the
overall biluminescence efficiency already at moderate excitation levels.
Additionally, the presented system represents an illustrative role model to
study excitonic effects in organic materials.
|
[{'version': 'v1', 'created': 'Fri, 21 Apr 2017 13:49:59 GMT'}]
|
2019-06-07
|
[array(['Redondo', 'Caterin Salas', ''], dtype=object)
array(['Kleine', 'Paul', ''], dtype=object)
array(['Roszeitis', 'Karla', ''], dtype=object)
array(['Achenbach', 'Tim', ''], dtype=object)
array(['Kroll', 'Martin', ''], dtype=object)
array(['Thomschke', 'Michael', ''], dtype=object)
array(['Reineke', 'Sebastian', ''], dtype=object)]
|
3,359 |
2106.15324
|
Nathan Beck
|
Nathan Beck, Durga Sivasubramanian, Apurva Dani, Ganesh Ramakrishnan,
Rishabh Iyer
|
Effective Evaluation of Deep Active Learning on Image Classification
Tasks
|
10 pages in main paper, 6 figures in main paper, 2 tables in main
paper. 24 pages in total, 15 figures in total, 13 tables in total
| null | null | null |
cs.CV cs.AI cs.LG
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
With the goal of making deep learning more label-efficient, a growing number
of papers have been studying active learning (AL) for deep models. However,
there are a number of issues in the prevalent experimental settings, mainly
stemming from a lack of unified implementation and benchmarking. Issues in the
current literature include sometimes contradictory observations on the
performance of different AL algorithms, unintended exclusion of important
generalization approaches such as data augmentation and SGD for optimization, a
lack of study of evaluation facets like the labeling efficiency of AL, and
little or no clarity on the scenarios in which AL outperforms random sampling
(RS). In this work, we present a unified re-implementation of state-of-the-art
AL algorithms in the context of image classification via our new open-source AL
toolkit DISTIL, and we carefully study these issues as facets of effective
evaluation. On the positive side, we show that AL techniques are $2\times$ to
$4\times$ more label-efficient compared to RS with the use of data
augmentation. Surprisingly, when data augmentation is included, there is no
longer a consistent gain in using BADGE, a state-of-the-art approach, over
simple uncertainty sampling. We then do a careful analysis of how existing
approaches perform with varying amounts of redundancy and number of examples
per class. Finally, we provide several insights for AL practitioners to
consider in future work, such as the effect of the AL batch size, the effect of
initialization, the importance of retraining the model at every round, and
other insights.
|
[{'version': 'v1', 'created': 'Wed, 16 Jun 2021 23:29:39 GMT'}
{'version': 'v2', 'created': 'Wed, 30 Jun 2021 04:49:40 GMT'}
{'version': 'v3', 'created': 'Tue, 2 Nov 2021 20:25:49 GMT'}]
|
2021-11-04
|
[array(['Beck', 'Nathan', ''], dtype=object)
array(['Sivasubramanian', 'Durga', ''], dtype=object)
array(['Dani', 'Apurva', ''], dtype=object)
array(['Ramakrishnan', 'Ganesh', ''], dtype=object)
array(['Iyer', 'Rishabh', ''], dtype=object)]
|
3,360 |
1010.2156
|
Spela Spenko
|
Matej Bresar, Peter Semrl, Spela Spenko
|
On locally complex algebras and low-dimensional Cayley-Dickson algebras
|
Some changes suggested by the referee, accepted for publication in
Journal of Algebra
| null | null | null |
math.RA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper begins with short proofs of classical theorems by Frobenius and
(resp.) Zorn on associative and (resp.) alternative real division algebras.
These theorems characterize the first three (resp. four) Cayley-Dickson
algebras. Then we introduce and study the class of real unital nonassociative
algebras in which the subalgebra generated by any nonscalar element is
isomorphic to C. We call them locally complex algebras. In particular, we
describe all such algebras that have dimension at most 4. Our main motivation,
however, for introducing locally complex algebras is that this concept makes it
possible for us to extend Frobenius' and Zorn's theorems in a way that it also
involves the fifth Cayley-Dickson algebra, the sedenions.
|
[{'version': 'v1', 'created': 'Mon, 11 Oct 2010 16:53:15 GMT'}
{'version': 'v2', 'created': 'Thu, 25 Nov 2010 23:54:04 GMT'}]
|
2010-11-30
|
[array(['Bresar', 'Matej', ''], dtype=object)
array(['Semrl', 'Peter', ''], dtype=object)
array(['Spenko', 'Spela', ''], dtype=object)]
|
3,361 |
1904.01080
|
Jonathan Kelly
|
Lee Clement, Mona Gridseth, Justin Tomasi and Jonathan Kelly
|
Learning Matchable Image Transformations for Long-term Metric Visual
Localization
|
In IEEE Robotics and Automation Letters (RA-L) and presented at the
IEEE International Conference on Robotics and Automation (ICRA'20), Paris,
France, May 31-June 4, 2020
|
IEEE Robotics and Automation Letters (RA-L), Vol. 5, No. 2, pp.
1492-1499, Apr. 2020
|
10.1109/LRA.2020.2967659
| null |
cs.CV cs.LG cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Long-term metric self-localization is an essential capability of autonomous
mobile robots, but remains challenging for vision-based systems due to
appearance changes caused by lighting, weather, or seasonal variations. While
experience-based mapping has proven to be an effective technique for bridging
the `appearance gap,' the number of experiences required for reliable metric
localization over days or months can be very large, and methods for reducing
the necessary number of experiences are needed for this approach to scale.
Taking inspiration from color constancy theory, we learn a nonlinear
RGB-to-grayscale mapping that explicitly maximizes the number of inlier feature
matches for images captured under different lighting and weather conditions,
and use it as a pre-processing step in a conventional single-experience
localization pipeline to improve its robustness to appearance change. We train
this mapping by approximating the target non-differentiable localization
pipeline with a deep neural network, and find that incorporating a learned
low-dimensional context feature can further improve cross-appearance feature
matching. Using synthetic and real-world datasets, we demonstrate substantial
improvements in localization performance across day-night cycles, enabling
continuous metric localization over a 30-hour period using a single mapping
experience, and allowing experience-based localization to scale to long
deployments with dramatically reduced data requirements.
|
[{'version': 'v1', 'created': 'Mon, 1 Apr 2019 19:38:56 GMT'}
{'version': 'v2', 'created': 'Sun, 8 Dec 2019 17:06:19 GMT'}
{'version': 'v3', 'created': 'Mon, 13 Jan 2020 03:53:09 GMT'}
{'version': 'v4', 'created': 'Thu, 27 Feb 2020 20:23:40 GMT'}
{'version': 'v5', 'created': 'Tue, 5 Jul 2022 04:40:27 GMT'}]
|
2022-07-06
|
[array(['Clement', 'Lee', ''], dtype=object)
array(['Gridseth', 'Mona', ''], dtype=object)
array(['Tomasi', 'Justin', ''], dtype=object)
array(['Kelly', 'Jonathan', ''], dtype=object)]
|
3,362 |
2008.03384
|
Ian Ochs
|
Ian E. Ochs and Nathaniel J. Fisch
|
Magnetogenesis by Wave-Driven Momentum Exchange
|
9 pages, 1 figure
|
ApJ, 905:13 (2020)
|
10.3847/1538-4357/abc4e8
| null |
physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When multiple species interact with an electrostatic ion acoustic wave, they
can exchange momentum, despite the lack of momentum in the field itself. The
resulting force on the electrons can have a curl, and thus give rise to
compensating electric fields with curl on magnetohydrodynamic timescales. As a
result, a magnetic field can be generated. Surprisingly, in some astrophysical
settings, this mechanism can seed magnetic fields with growth rates even larger
than through the traditional Biermann battery.
|
[{'version': 'v1', 'created': 'Fri, 7 Aug 2020 21:46:01 GMT'}]
|
2023-05-18
|
[array(['Ochs', 'Ian E.', ''], dtype=object)
array(['Fisch', 'Nathaniel J.', ''], dtype=object)]
|
3,363 |
2011.03291
|
Abhyuday Pandey
|
Surender Baswana and Abhyuday Pandey
|
Sensitivity Oracles for All-Pairs Mincuts
| null | null | null | null |
cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $G=(V,E)$ be an undirected unweighted graph on $n$ vertices and $m$
edges. We address the problem of sensitivity oracle for all-pairs mincuts in
$G$ defined as follows.
Build a compact data structure that, on receiving any pair of vertices
$s,t\in V$ and failure (or insertion) of any edge as query, can efficiently
report the mincut between $s$ and $t$ after the failure (or the insertion).
To the best of our knowledge, there exists no data structure for this problem
which takes $o(mn)$ space and a non-trivial query time. We present the
following results.
- Our first data structure occupies ${\cal O}(n^2)$ space and guarantees
${\cal O}(1)$ query time to report the value of resulting $(s,t)$-mincut upon
failure (or insertion) of any edge. Moreover, the set of vertices defining a
resulting $(s,t)$-mincut after the update can be reported in ${\cal O}(n)$ time
which is worst-case optimal.
- Our second data structure optimizes space at the expense of increased query
time. It takes ${\cal O}(m)$ space -- which is also the space taken by $G$. The
query time is ${\cal O}(\min(m,n c_{s,t}))$ where $c_{s,t}$ is the value of the
mincut between $s$ and $t$ in $G$. This query time is faster by a factor of
$\Omega(\min(m^{1/3},\sqrt{n}))$ compared to the best known deterministic
algorithm to compute a $(s,t)$-mincut from scratch.
- If we are only interested in knowing if failure (or insertion) of an edge
changes the value of $(s,t)$-mincut, we can distribute our ${\cal O}(n^2)$
space data structure evenly among $n$ vertices. For any failed (or inserted)
edge we only require the data structures stored at its endpoints to determine
if the value of $(s,t)$-mincut has changed for any $s,t \in V$.
|
[{'version': 'v1', 'created': 'Fri, 6 Nov 2020 11:33:12 GMT'}
{'version': 'v2', 'created': 'Sun, 3 Oct 2021 06:31:20 GMT'}]
|
2021-10-05
|
[array(['Baswana', 'Surender', ''], dtype=object)
array(['Pandey', 'Abhyuday', ''], dtype=object)]
|
3,364 |
cond-mat/0206152
|
Zbigniew Koza
|
Zbigniew Koza
|
Asymptotic expansion for reversible A + B <-> C reaction-diffusion
process
|
6 pages, no figures, to appear in PRE
|
Phys. Rev. E 66, 011103 (2002).
|
10.1103/PhysRevE.66.011103
| null |
cond-mat.stat-mech
| null |
We study long-time properties of reversible reaction-diffusion systems of
type A + B <-> C by means of perturbation expansion in powers of 1/t (inverse
of time). For the case of equal diffusion coefficients we present exact
formulas for the asymptotic forms of reactant concentrations and a complete,
recursive expression for an arbitrary term of the expansions. Taking an
appropriate limit we show that by studying reversible reactions one can obtain
"singular" solutions typical of irreversible reactions.
|
[{'version': 'v1', 'created': 'Mon, 10 Jun 2002 15:14:59 GMT'}]
|
2009-11-07
|
[array(['Koza', 'Zbigniew', ''], dtype=object)]
|
3,365 |
1710.06723
|
Fulvia Confortola
|
F. Confortola, A. Cosso and M. Fuhrman
|
Backward SDEs and infinite horizon stochastic optimal control
|
30 pages
| null | null | null |
math.OC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study an optimal control problem on infinite horizon for a controlled
stochastic differential equation driven by Brownian motion, with a discounted
reward functional. The equation may have memory or delay effects in the
coefficients, both with respect to state and control, and the noise can be
degenerate. We prove that the value, i.e. the supremum of the reward functional
over all admissible controls, can be represented by the solution of an
associated backward stochastic differential equation (BSDE) driven by the
Brownian motion and an auxiliary independent Poisson process and having a sign
constraint on jumps.
In the Markovian case when the coefficients depend only on the present values
of the state and the control, we prove that the BSDE can be used to construct
the solution, in the sense of viscosity theory, to the corresponding
Hamilton-Jacobi-Bellman partial differential equation of elliptic type on the
whole space, so that it provides us with a Feynman-Kac representation in this
fully nonlinear context.
The method of proof consists in showing that the value of the original
problem is the same as the value of an auxiliary optimal control problem
(called randomized), where the control process is replaced by a fixed pure jump
process and maximization is taken over a class of absolutely continuous changes
of measures which affect the stochastic intensity of the jump process but leave
the law of the driving Brownian motion unchanged.
|
[{'version': 'v1', 'created': 'Wed, 18 Oct 2017 13:34:02 GMT'}]
|
2017-10-19
|
[array(['Confortola', 'F.', ''], dtype=object)
array(['Cosso', 'A.', ''], dtype=object)
array(['Fuhrman', 'M.', ''], dtype=object)]
|
3,366 |
1005.4360
|
Amparo F\'uster-Sabater
|
Amparo F\'uster-Sabater and J.M. Guill\'en
|
Questions of controllability and observability for nonuniformly sampled
discrete systems
|
There are several equations that must be corrected
|
IEE Proceedings, Vol. 135, Pt D, No. 4, pp. 248-252, July 1988
| null |
INSPEC Accession Number: 3202336
|
math.DS math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A joint characterisation of the controllability and observability of a
particular kind of discrete system has been developed. The key idea of the
procedure can be reduced to a correct choice of the sampling sequence. This
freedom, owing to the arbitrary choice of the sampling instants, is used to
improve the sensitivity of system controllability and observability, by
exploiting an adequate geometric structure. Some qualitative examples are
presented for illustrative purposes.
|
[{'version': 'v1', 'created': 'Mon, 24 May 2010 15:37:54 GMT'}
{'version': 'v2', 'created': 'Fri, 11 Jun 2010 07:23:10 GMT'}]
|
2010-06-14
|
[array(['Fúster-Sabater', 'Amparo', ''], dtype=object)
array(['Guillén', 'J. M.', ''], dtype=object)]
|
3,367 |
1012.2011
|
Levon Chakhmakhchyan
|
L. N. Ananikyan, N. S. Ananikian, L. A. Chakhmakhchyan
|
Arnold Tongues and Feigenbaum Exponents of the Rational Mapping for
Q-state Potts Model on Recursive Lattice: Q<2
|
15 pages, 12 figures
|
Fractals 18:371-383,2010
|
10.1142/S0218348X10005007
| null |
cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We considered Q-state Potts model on Bethe lattice in presence of external
magnetic field for Q<2 by means of recursion relation technique. This allows to
study the phase transition mechanism in terms of the obtained one dimensional
rational mapping. The convergence of Feigenabaum $\alpha$ and $\delta$
exponents for the aforementioned mapping is investigated for the period
doubling and three cyclic window. We regarded the Lyapunov exponent as an order
parameter for the characterization of the model and discussed its dependence on
temperature and magnetic field. Arnold tongues analogs with winding numbers
w=1/2, w=2/4 and w=1/3 (in the three cyclic window) are constructed for Q<2.
The critical temperatures of the model are discussed and their dependence on Q
is investigated. We also proposed an approximate method for constructing Arnold
tongues via Feigenbaum $\delta$ exponent.
|
[{'version': 'v1', 'created': 'Thu, 9 Dec 2010 14:19:52 GMT'}
{'version': 'v2', 'created': 'Fri, 10 Dec 2010 10:36:14 GMT'}]
|
2011-02-22
|
[array(['Ananikyan', 'L. N.', ''], dtype=object)
array(['Ananikian', 'N. S.', ''], dtype=object)
array(['Chakhmakhchyan', 'L. A.', ''], dtype=object)]
|
3,368 |
2102.02638
|
Letian Zhang
|
Letian Zhang, Lixing Chen, Jie Xu
|
Autodidactic Neurosurgeon: Collaborative Deep Inference for Mobile Edge
Intelligence via Online Learning
| null | null | null | null |
cs.LG cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent breakthroughs in deep learning (DL) have led to the emergence of many
intelligent mobile applications and services, but in the meanwhile also pose
unprecedented computing challenges on resource-constrained mobile devices. This
paper builds a collaborative deep inference system between a
resource-constrained mobile device and a powerful edge server, aiming at
joining the power of both on-device processing and computation offloading. The
basic idea of this system is to partition a deep neural network (DNN) into a
front-end part running on the mobile device and a back-end part running on the
edge server, with the key challenge being how to locate the optimal partition
point to minimize the end-to-end inference delay. Unlike existing efforts on
DNN partitioning that rely heavily on a dedicated offline profiling stage to
search for the optimal partition point, our system has a built-in online
learning module, called Autodidactic Neurosurgeon (ANS), to automatically learn
the optimal partition point on-the-fly. Therefore, ANS is able to closely
follow the changes of the system environment by generating new knowledge for
adaptive decision making. The core of ANS is a novel contextual bandit learning
algorithm, called $\mu$LinUCB, which not only has provable theoretical learning
performance guarantee but also is ultra-lightweight for easy real-world
implementation. We implement our system on a video stream object detection
testbed to validate the design of ANS and evaluate its performance. The
experiments show that ANS significantly outperforms state-of-the-art benchmarks
in terms of tracking system changes and reducing the end-to-end inference
delay.
|
[{'version': 'v1', 'created': 'Tue, 2 Feb 2021 18:50:06 GMT'}]
|
2021-02-05
|
[array(['Zhang', 'Letian', ''], dtype=object)
array(['Chen', 'Lixing', ''], dtype=object)
array(['Xu', 'Jie', ''], dtype=object)]
|
3,369 |
2009.01479
|
Shun Cao
|
Shun Cao, Yi Jin, Hongguang Dong, Tingbiao Guo, Jinlong He and Sailing
He
|
Enhancing single photon emission through quasi-bound states in the
continuum of monolithic hexagonal boron nitride metasurface
|
17 pages, 4 figures
| null | null | null |
physics.optics physics.app-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A patterned structure of monolithic hexagonal boron nitride (hBN) on a glass
substrate, which can enhance the emission of the embedded single photon
emitters (SPEs), is useful for onchip single-photon sources of high-quality.
Here, we design and demonstrate a monolithic hBN metasurface with quasi-bound
states in the continuum mode at emission wavelength with ultrahigh Q values to
enhance fluorescence emission of SPEs in hBN. Because of ultrahigh electric
field enhancement inside the proposed hBN metasurface, an ultrahigh Purcell
factor (3.3*10^4) is achieved. In addition, the Purcell factor can also be
strongly enhanced in most part of the hBN structure, which makes the hBN
metasurface suitable for e.g. monolithic quantum photonics.
|
[{'version': 'v1', 'created': 'Thu, 3 Sep 2020 06:37:02 GMT'}]
|
2020-09-04
|
[array(['Cao', 'Shun', ''], dtype=object)
array(['Jin', 'Yi', ''], dtype=object)
array(['Dong', 'Hongguang', ''], dtype=object)
array(['Guo', 'Tingbiao', ''], dtype=object)
array(['He', 'Jinlong', ''], dtype=object)
array(['He', 'Sailing', ''], dtype=object)]
|
3,370 |
2203.15043
|
Dominik Pajak
|
Dariusz R. Kowalski, Dominik Pajak
|
Efficient Algorithm for Deterministic Search of Hot Elements
| null | null | null | null |
cs.DS
|
http://creativecommons.org/licenses/by/4.0/
|
When facing a very large stream of data, it is often desirable to extract
most important statistics online in a short time and using small memory. For
example, one may want to quickly find the most influential users generating
posts online or check if the stream contains many identical elements. In this
paper, we study streams containing insertions and deletions of elements from a
possibly large set $N$ of size $|N| = n$, that are being processed by online
deterministic algorithms. At any point in the stream the algorithm may be
queried to output elements of certain frequency in the already processed
stream. More precisely, the most frequent elements in the stream so far. The
output is considered correct if the returned elements it contains all elements
with frequency greater than a given parameter $\varphi$ and no element with
frequency smaller than $\varphi-\epsilon$. We present an efficient online
deterministic algorithm for solving this problem using $O(\min(n,
\frac{polylog(n)}{\epsilon}))$ memory and $O(polylog(n))$ time per processing
and outputting an element. It is the first such algorithm as the previous
algorithms were either randomized, or processed elements in substantially
larger time $\Omega(\min(n, \frac{\log n}{\epsilon}))$, or handled only
insertions and required two passes over the stream (i.e., were not truly
online). Our solution is almost-optimally scalable (with only a polylogarithmic
overhead) and does not require randomness or scanning twice through the stream.
We complement the algorithm analysis with a lower bound $\Omega(\min(n,
\frac{1}{\epsilon}))$ on required memory.
|
[{'version': 'v1', 'created': 'Mon, 28 Mar 2022 19:13:19 GMT'}]
|
2022-03-30
|
[array(['Kowalski', 'Dariusz R.', ''], dtype=object)
array(['Pajak', 'Dominik', ''], dtype=object)]
|
3,371 |
astro-ph/0211456
|
Ulisse Munari
|
C.Pernechele and U.Munari (Astronomical Observatory of Padova, Italy)
|
Bragg gratings in multi-mode fiber optics for wavelength calibration of
GAIA and RAVE spectra
|
in "GAIA Spectroscopy, Science and Technology", U.Munari ed., ASP
Conf. Series, in press
| null | null | null |
astro-ph
| null |
We propose a new technique, the use of FBGs (fiber Bragg gratings), for
accurate, easy and low cost wavelength calibration of GAIA, RAVE and follow-ups
spectra at local Observatories. FBGs mark the spectra with absorption lines,
freely defined in number and position during the fibers manufacturing. The
process goes in parallel with the science exposure and through the same optical
train and path, thus ensuring the maximum return in wavelength calibration
accuracy. Plans to manufacture and test FBGs for the CaII/Paschen region are
underway at the Astronomical Observatory of Padova.
|
[{'version': 'v1', 'created': 'Wed, 20 Nov 2002 16:29:06 GMT'}]
|
2007-05-23
|
[array(['Pernechele', 'C.', '',
'Astronomical Observatory of Padova, Italy'], dtype=object)
array(['Munari', 'U.', '', 'Astronomical Observatory of Padova, Italy'],
dtype=object) ]
|
3,372 |
2003.02971
|
Kasra Amini
|
Kasra Amini, Jens Biegert
|
Ultrafast electron diffraction imaging of gas-phase molecules
| null |
Advances in Atomic and Molecular Physics, volume 69, Elsevier,
2020
| null | null |
physics.chem-ph physics.atm-clus
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Knowledge of molecular structure is paramount in understanding, and
ultimately influencing, chemical reactivity. For nearly a century, diffractive
imaging has been used to identify the structures of many biologically-relevant
gas-phase molecules with atomic (i.e. Angstrom, A; 1 A = 10$^{-10}$ m) spatial
resolution. Unravelling the mechanisms of chemical reactions requires the
capability to record multiple well-resolved snapshots of the molecular
structure as it is evolving on the nuclear (i.e. femtosecond, fs; 1 fs =
10$^{-15}$ s) timescale. We present the latest, state-of-the-art ultrafast
electron diffraction methods used to retrieve the molecular structure of
gas-phase molecules with Angstrom and femtosecond spatio-temporal resolution.
We first provide a historical and theoretical background to elastic electron
scattering in its application to structural retrieval, followed by details of
field-free and field-dressed ultrafast electron diffraction techniques. We
discuss the application of these ultrafast methods to time-resolving chemical
reactions in real-time, before providing a future outlook of the field and the
challenges that exist today and in the future.
|
[{'version': 'v1', 'created': 'Fri, 6 Mar 2020 00:05:44 GMT'}]
|
2020-03-09
|
[array(['Amini', 'Kasra', ''], dtype=object)
array(['Biegert', 'Jens', ''], dtype=object)]
|
3,373 |
1608.05595
|
Robert Whitney S.
|
Giuliano Benenti, Giulio Casati, Keiji Saito, and Robert S. Whitney
|
Fundamental aspects of steady-state conversion of heat to work at the
nanoscale
|
Review Article (158 pages). This is the final version (version 3)
with typos corrected and a better layout. Some sections of this review are
based on the shorter unpublished review arXiv:1311.4430
|
Physics Reports, 694, 1 (2017)
|
10.1016/j.physrep.2017.05.008
| null |
cond-mat.mes-hall cond-mat.stat-mech quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent years, the study of heat to work conversion has been re-invigorated
by nanotechnology. Steady-state devices do this conversion without any
macroscopic moving parts, through steady-state flows of microscopic particles
such as electrons, photons, phonons, etc. This review aims to introduce some of
the theories used to describe these steady-state flows in a variety of
mesoscopic or nanoscale systems. These theories are introduced in the context
of idealized machines which convert heat into electrical power (heat-engines)
or convert electrical power into a heat flow (refrigerators). In this sense,
the machines could be categorized as thermoelectrics, although this should be
understood to include photovoltaics when the heat source is the sun. As quantum
mechanics is important for most such machines, they fall into the field of
quantum thermodynamics. In many cases, the machines we consider have few
degrees of freedom, however the reservoirs of heat and work that they interact
with are assumed to be macroscopic. This review discusses different theories
which can take into account different aspects of mesoscopic and nanoscale
physics, such as coherent quantum transport, magnetic-field induced effects
(including topological ones such as the quantum Hall effect), and single
electron charging effects. It discusses the efficiency of thermoelectric
conversion, and the thermoelectric figure of merit. More specifically, the
theories presented are (i) linear response theory with or without magnetic
fields, (ii) Landauer scattering theory in the linear response regime and far
from equilibrium, (iii) Green-Kubo formula for strongly interacting systems
within the linear response regime, (iv) rate equation analysis for small
quantum machines with or without ..... (SEE THE PDF FOR THE REST OF THIS
ABSTRACT)
|
[{'version': 'v1', 'created': 'Fri, 19 Aug 2016 13:19:00 GMT'}
{'version': 'v2', 'created': 'Wed, 24 May 2017 16:36:41 GMT'}
{'version': 'v3', 'created': 'Fri, 14 Jul 2017 10:09:44 GMT'}]
|
2017-08-14
|
[array(['Benenti', 'Giuliano', ''], dtype=object)
array(['Casati', 'Giulio', ''], dtype=object)
array(['Saito', 'Keiji', ''], dtype=object)
array(['Whitney', 'Robert S.', ''], dtype=object)]
|
3,374 |
0710.3525
|
Shaaban Khalil
|
S. Khalil and A. Masiero
|
Radiative B-L symmetry breaking in supersymmetric models
|
4 pages
|
Phys.Lett.B665:374-377,2008
|
10.1016/j.physletb.2008.06.063
| null |
hep-ph
| null |
We propose a scheme where the three relevant physics scales related to the
supersymmetry, electroweak, and baryon minus lepton (B-L) breakings are linked
together and occur at the TeV scale. The phenomenological implications in the
Higgs and leptonic sectors are discussed.
|
[{'version': 'v1', 'created': 'Thu, 18 Oct 2007 14:42:40 GMT'}]
|
2008-11-26
|
[array(['Khalil', 'S.', ''], dtype=object)
array(['Masiero', 'A.', ''], dtype=object)]
|
3,375 |
1901.10257
|
Earo Wang
|
Earo Wang, Dianne Cook, Rob J Hyndman
|
A new tidy data structure to support exploration and modeling of
temporal data
|
Revision on Section 4 and 5
| null | null | null |
stat.AP stat.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Mining temporal data for information is often inhibited by a multitude of
formats: irregular or multiple time intervals, point events that need
aggregating, multiple observational units or repeated measurements on multiple
individuals, and heterogeneous data types. On the other hand, the software
supporting time series modeling and forecasting, makes strict assumptions on
the data to be provided, typically requiring a matrix of numeric data with
implicit time indexes. Going from raw data to model-ready data is painful. This
work presents a cohesive and conceptual framework for organizing and
manipulating temporal data, which in turn flows into visualization, modeling
and forecasting routines. Tidy data principles are extended to temporal data
by: (1) mapping the semantics of a dataset into its physical layout; (2)
including an explicitly declared index variable representing time; (3)
incorporating a "key" comprising single or multiple variables to uniquely
identify units over time. This tidy data representation most naturally supports
thinking of operations on the data as building blocks, forming part of a "data
pipeline" in time-based contexts. A sound data pipeline facilitates a fluent
workflow for analyzing temporal data. The infrastructure of tidy temporal data
has been implemented in the R package "tsibble".
|
[{'version': 'v1', 'created': 'Tue, 29 Jan 2019 12:48:59 GMT'}
{'version': 'v2', 'created': 'Wed, 13 Feb 2019 05:32:47 GMT'}]
|
2019-02-14
|
[array(['Wang', 'Earo', ''], dtype=object)
array(['Cook', 'Dianne', ''], dtype=object)
array(['Hyndman', 'Rob J', ''], dtype=object)]
|
3,376 |
1608.01203
|
Arnab Pariari Kumar
|
Prithwish Dutta, Arnab Pariari, and Prabhat Mandal
|
Prominent metallic surface conduction and the singular magnetic response
of topological Dirac fermion in three-dimensional topological insulator
Bi$_{1.5}$Sb$_{0.5}$Te$_{1.7}$Se$_{1.3}$
| null |
Scientific Reports 7, Article number: 4883 (2017)
|
10.1038/s41598-017-05164-9
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report semiconductor to metal-like crossover in temperature dependence of
resistivity ($\rho$) due to the switching of charge transport from bulk to
surface channel in three-dimensional topological insulator
Bi$_{1.5}$Sb$_{0.5}$Te$_{1.7}$Se$_{1.3}$. Unlike earlier studies, a much
sharper drop in $\rho$($T$) is observed below the crossover temperature due to
the dominant surface conduction. Remarkably, the resistivity of the conducting
surface channel follows a rarely observable $T^2$ dependence at low temperature
as predicted theoretically for a two-dimensional Fermi liquid system. The field
dependence of magnetization shows a cusp-like paramagnetic peak in the
susceptibility ($\chi$) at zero field over the diamagnetic background. The peak
is found to be robust against temperature and decays linearly with field from
its zero-field value. This unique behavior of $\chi$ is associated with the
spin-momentum locked topological surface state of
Bi$_{1.5}$Sb$_{0.5}$Te$_{1.7}$Se$_{1.3}$. The reconstruction of surface state
with time is clearly reflected through the reduction of peak height with the
age of the sample.
|
[{'version': 'v1', 'created': 'Wed, 3 Aug 2016 14:29:32 GMT'}
{'version': 'v2', 'created': 'Wed, 21 Sep 2016 05:10:55 GMT'}]
|
2017-07-10
|
[array(['Dutta', 'Prithwish', ''], dtype=object)
array(['Pariari', 'Arnab', ''], dtype=object)
array(['Mandal', 'Prabhat', ''], dtype=object)]
|
3,377 |
1806.08045
|
Jinhyun Park
|
Amalendu Krishna and Jinhyun Park
|
A moving lemma for relative $0$-cycles
|
v1: 42 pages. Evolved from \S 5 to \S 11 of arXiv:1504.08181. A
generalization of the remaining part of arXiv:1504.08181 posted as a
replacement of arXiv:1504.08181/ v2: 42 pages. Revised / v3: 47 pages. Major
revision. A version of it to appear in Algebra & Number Theory. (This is
different from the final accepted version, due to copyright reason.)
|
Alg. Number Th. 14 (2020) 991-1054
|
10.2140/ant.2020.14.991
| null |
math.AG math.KT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove a moving lemma for the additive and ordinary higher Chow groups of
relative $0$-cycles of regular semi-local $k$-schemes essentially of finite
type over an infinite perfect field. From this, we show that the cycle classes
can be represented by cycles that possess certain finiteness, surjectivity, and
smoothness properties. It plays a key role in showing that the crystalline
cohomology of smooth varieties can be expressed in terms of algebraic cycles.
|
[{'version': 'v1', 'created': 'Thu, 21 Jun 2018 02:15:19 GMT'}
{'version': 'v2', 'created': 'Mon, 2 Jul 2018 07:27:32 GMT'}
{'version': 'v3', 'created': 'Tue, 17 Dec 2019 04:46:03 GMT'}]
|
2020-06-24
|
[array(['Krishna', 'Amalendu', ''], dtype=object)
array(['Park', 'Jinhyun', ''], dtype=object)]
|
3,378 |
physics/0008203
|
Roger M. Jones
|
R.M. Jones, T. Higo, Y. Higashi, N. Toge, N.M. Kroll, R.J. Loewen,
R.H. Miller, and J.W. Wang
|
Comparisons Of Equivalent Circuit Predictions With Measurements For
Short Stacks Of Rdds1 Discs, And Their Potential Application To Improved
Wakefield Prediction
|
Paper for LINAC2000 (TUA08)
|
eConf C000821:TUA08,2000
| null | null |
physics.acc-ph
| null |
In fabricating the first X-Band RDDS (Rounded Damped Detuned Structure)
accelerator structure, microwave measurements are made on short groups of discs
prior to bonding the discs of the entire structure. The design dispersion
curves are compared with the frequency measurements. The theory utilised is
based on a circuit model adapted to a short stack of slowly varying non-uniform
discs. The model reveals the nature of the modes in the structure and may also
be used to refit the experimental data to the parameters in a model of the
wakefield given earlier [1]. This method allows a more faithful determination
of the wakefield that a beam will experience as it traverses the structure.
Results obtained on the frequencies are compared to the original design.
[1] R.M.Jones, et al, EPAC96 (also SLAC-PUB-7187)
|
[{'version': 'v1', 'created': 'Sun, 20 Aug 2000 21:22:55 GMT'}]
|
2009-03-12
|
[array(['Jones', 'R. M.', ''], dtype=object)
array(['Higo', 'T.', ''], dtype=object)
array(['Higashi', 'Y.', ''], dtype=object)
array(['Toge', 'N.', ''], dtype=object)
array(['Kroll', 'N. M.', ''], dtype=object)
array(['Loewen', 'R. J.', ''], dtype=object)
array(['Miller', 'R. H.', ''], dtype=object)
array(['Wang', 'J. W.', ''], dtype=object)]
|
3,379 |
1201.0279
|
Marc Levine
|
Marc Levine
|
Convergence of Voevodsky's slice tower
|
revised version. Arguments simplified, bounds are improved and made
explicit, some technical hypotheses removed. An appendix on inverting
integers in triangulated categories is added
| null | null | null |
math.AG math.AT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider Voevodsky's slice tower for a finite spectrum E in the motivic
stable homotopy category over a perfect field k. In case k has finite
cohomological dimension (in characteristic two, we also require that k is
infinite), we show that the slice tower converges, in that the induced
filtration on the bi-graded homotopy sheaves for each term in the tower for E
is finite, exhaustive and separated at each stalk. This partially verifies a
conjecture of Voevodsky.
|
[{'version': 'v1', 'created': 'Sat, 31 Dec 2011 16:04:09 GMT'}
{'version': 'v2', 'created': 'Thu, 7 Mar 2013 19:24:25 GMT'}]
|
2013-03-08
|
[array(['Levine', 'Marc', ''], dtype=object)]
|
3,380 |
hep-ph/9807326
|
Ken-ichi Hikasa
|
Keiji Igi and Ken-ichi Hikasa
|
Another look at $\pi\pi$ scattering in the scalar channel
|
17 pages, 5 figures, REVTeX
|
Phys.Rev.D59:034005,1999
|
10.1103/PhysRevD.59.034005
|
TU-552, RCNS-98-12, KNGU-INFO-PH-1
|
hep-ph
| null |
We set up a general framework to describe $\pi\pi$ scattering below 1 GeV
based on chiral low-energy expansion with possible spin-0 and 1 resonances.
Partial wave amplitudes are obtained with the $N/D$ method, which satisfy
unitarity, analyticity and approximate crossing symmetry. Comparison with the
phase shift data in the J=0 channel favors a scalar resonance near the $\rho$
mass.
|
[{'version': 'v1', 'created': 'Fri, 10 Jul 1998 09:34:32 GMT'}]
|
2008-11-26
|
[array(['Igi', 'Keiji', ''], dtype=object)
array(['Hikasa', 'Ken-ichi', ''], dtype=object)]
|
3,381 |
1801.08028
|
Gao-Ming Deng
|
Gao-Ming Deng, Jinbo Fan, Xinfei Li, Yong-Chang Huang
|
Thermodynamics and phase transition of charged AdS black holes with a
global monopole
|
13 pages, 9 figures, comments welcome
| null |
10.1142/S0217751X18500227
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Thermodynamical properties of charged AdS black holes with a global monopole
still remain obscure. In this paper, we investigate the thermodynamics and
phase transition of the black holes in the extended phase space. It is shown
that thermodynamical quantities of the black holes exhibit an interesting
dependence on the internal global monopole, and they perfectly satisfy both the
first law of thermodynamics and Smarr relation. Furthermore, analysis of the
local and the global thermodynamical stability manifests that the charged AdS
black hole undergoes an elegant phase transition at critical point. Of special
interest, critical behaviors of the black holes resemble a Van der Waals
liquid-gas system. Our results not only reveal the effect of a global monopole
on thermodynamics of AdS black holes, but also further support that Van der
Waals-like behavior of the black holes is a universal phenomenon.
|
[{'version': 'v1', 'created': 'Wed, 24 Jan 2018 15:37:58 GMT'}]
|
2018-02-28
|
[array(['Deng', 'Gao-Ming', ''], dtype=object)
array(['Fan', 'Jinbo', ''], dtype=object)
array(['Li', 'Xinfei', ''], dtype=object)
array(['Huang', 'Yong-Chang', ''], dtype=object)]
|
3,382 |
0709.2173
|
Nathalie Wahl
|
Allen Hatcher, Nathalie Wahl
|
Stabilization for mapping class groups of 3-manifolds
|
v4: improvements in the exposition as well as improvements in the
main combinatorial theorem in the paper, concerning complexes built from
joins
|
Duke Math. J. 155, no. 2 (2010), 205-269
|
10.1215/00127094-2010-055
|
CPH-SYM-00
|
math.GT math.AT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that the homology of the mapping class group of any 3-manifold
stabilizes under connected sum and boundary connected sum with an arbitrary
3-manifold when both manifolds are compact and orientable. The stabilization
also holds for the quotient group by twists along spheres and disks, and
includes as particular cases homological stability for symmetric automorphisms
of free groups, automorphisms of certain free products, and handlebody mapping
class groups. Our methods also apply to manifolds of other dimensions in the
case of stabilization by punctures.
|
[{'version': 'v1', 'created': 'Fri, 14 Sep 2007 14:56:33 GMT'}
{'version': 'v2', 'created': 'Fri, 12 Oct 2007 09:32:15 GMT'}
{'version': 'v3', 'created': 'Tue, 12 Aug 2008 16:19:41 GMT'}
{'version': 'v4', 'created': 'Fri, 23 Oct 2009 20:23:54 GMT'}]
|
2019-12-19
|
[array(['Hatcher', 'Allen', ''], dtype=object)
array(['Wahl', 'Nathalie', ''], dtype=object)]
|
3,383 |
2006.03258
|
Nir Shlezinger
|
Nir Shlezinger, Nariman Farsad, Yonina C. Eldar, and Andrea J.
Goldsmith
|
Learned Factor Graphs for Inference from Stationary Time Sequences
| null | null | null | null |
cs.LG cs.IT math.IT stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The design of methods for inference from time sequences has traditionally
relied on statistical models that describe the relation between a latent
desired sequence and the observed one. A broad family of model-based algorithms
have been derived to carry out inference at controllable complexity using
recursive computations over the factor graph representing the underlying
distribution. An alternative model-agnostic approach utilizes machine learning
(ML) methods. Here we propose a framework that combines model-based algorithms
and data-driven ML tools for stationary time sequences. In the proposed
approach, neural networks are developed to separately learn specific components
of a factor graph describing the distribution of the time sequence, rather than
the complete inference task. By exploiting stationary properties of this
distribution, the resulting approach can be applied to sequences of varying
temporal duration. Learned factor graph can be realized using compact neural
networks that are trainable using small training sets, or alternatively, be
used to improve upon existing deep inference systems. We present an inference
algorithm based on learned stationary factor graphs, which learns to implement
the sum-product scheme from labeled data, and can be applied to sequences of
different lengths. Our experimental results demonstrate the ability of the
proposed learned factor graphs to learn to carry out accurate inference from
small training sets for sleep stage detection using the Sleep-EDF dataset, as
well as for symbol detection in digital communications with unknown channels.
|
[{'version': 'v1', 'created': 'Fri, 5 Jun 2020 07:06:19 GMT'}
{'version': 'v2', 'created': 'Thu, 31 Dec 2020 15:05:48 GMT'}
{'version': 'v3', 'created': 'Mon, 21 Jun 2021 05:49:57 GMT'}
{'version': 'v4', 'created': 'Fri, 24 Dec 2021 10:26:05 GMT'}]
|
2021-12-28
|
[array(['Shlezinger', 'Nir', ''], dtype=object)
array(['Farsad', 'Nariman', ''], dtype=object)
array(['Eldar', 'Yonina C.', ''], dtype=object)
array(['Goldsmith', 'Andrea J.', ''], dtype=object)]
|
3,384 |
2206.13248
|
Jimmy Garnier
|
Jimmy Garnier (LAMA), O Cotto (UMR PHIM), T Bourgeron (ADIA), E Bouin
(CEREMADE), T Lepoutre (ICJ, DRACULA), O Ronce (UMR ISEM), V Calvez (ICJ,
DRACULA)
|
Adaptation to a changing environment: what me Normal?
| null | null | null | null |
math.AP q-bio.PE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Predicting the adaptation of populations to a changing environment is crucial
to assess the impact of human activities on biodiversity. Many theoretical
studies have tackled this issue by modeling the evolution of quantitative
traits subject to stabilizing selection around an optimum phenotype, whose
value is shifted continuously through time. In this context, the population
fate results from the equilibrium distribution of the trait, relative to the
moving optimum. Such a distribution may vary with the shape of selection, the
system of reproduction, the number of loci, the mutation kernel or their
interactions. Here, we develop a methodology that provides quantitative
measures of population maladaptation and potential of survival directly from
the entire profile of the phenotypic distribution, without any a priori on its
shape.We investigate two different models of reproduction (asexual and
infinitesimal sexual models of inheritance), with general forms of selection.In
particular, we recover that fitness functions such that selection weakens away
from the optimum lead to evolutionary tipping points, with an abrupt collapse
of the population when the speed of environmental change is too high. Our
unified framework furthermore allows highlighting the underlying mechanisms
that lead to this phenomenon. More generally, it allows discussing similarities
and discrepancies between the two reproduction models, the latter being
ultimately explained by different constraints on the evolution of the
phenotypic variance. We demonstrate that the mean fitness in the population
crucially depends on the shape of the selection function in the sexual
infinitesimal model, in contrast with the asexual model.In the asexual model,
we also investigate the effect of the mutation kernel and we show that kernels
with higher kurtosis tend to reduce maladaptation and improve fitness,
especially in fast changing environments.
|
[{'version': 'v1', 'created': 'Mon, 27 Jun 2022 12:37:14 GMT'}]
|
2022-06-28
|
[array(['Garnier', 'Jimmy', '', 'LAMA'], dtype=object)
array(['Cotto', 'O', '', 'UMR PHIM'], dtype=object)
array(['Bourgeron', 'T', '', 'ADIA'], dtype=object)
array(['Bouin', 'E', '', 'CEREMADE'], dtype=object)
array(['Lepoutre', 'T', '', 'ICJ, DRACULA'], dtype=object)
array(['Ronce', 'O', '', 'UMR ISEM'], dtype=object)
array(['Calvez', 'V', '', 'ICJ,\n DRACULA'], dtype=object)]
|
3,385 |
1502.01818
|
Michel Galaup
|
Jean Heutte, Michel Galaup, Catherine Lelardeux, Pierre Lagarrigue
(LGMT (EA 814)), Fabien Fenouillet
|
Etude des d\'eterminants psychologiques de la persistance dans l'usage
d'un jeu s\'erieux : \'evaluation de l'environnement optimal d'apprentissage
avec Mecagenius?
|
in French
|
STICEF, ATIEF, 2014, Evaluation dans les jeux s\'erieux, 21,
pp.ISSN : 1764-7223, http://sticef.org/
| null | null |
cs.OH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The aim of this paper is to show the relevance of motivational key concepts
in evaluating the use of serious game. This research involves 115 students
training with Mecagenius (serious game in mechanical engineering). The results
of the exploratory study also confirm the relevance of the use of flow in
Education scale (EduFlow) to evaluate the optimal learning experienc ewith a
serious game. It also appears that EduFlow is related to specific actions
within the school context such as self-efficacy, motivational climate and
interest.
|
[{'version': 'v1', 'created': 'Fri, 6 Feb 2015 07:30:53 GMT'}]
|
2015-02-09
|
[array(['Heutte', 'Jean', '', 'LGMT'], dtype=object)
array(['Galaup', 'Michel', '', 'LGMT'], dtype=object)
array(['Lelardeux', 'Catherine', '', 'LGMT'], dtype=object)
array(['Lagarrigue', 'Pierre', '', 'LGMT'], dtype=object)
array(['Fenouillet', 'Fabien', ''], dtype=object)]
|
3,386 |
2006.16750
|
Yury Tchuvil'sky
|
D. M. Rodkin and Yu. M. Tchuvil'sky
|
Description of alpha-clustering of 8Be nucleus states in high-precision
theoretical approach
|
12 pages, 5 figures, 6 tables. arXiv admin note: text overlap with
arXiv:2006.14839
| null |
10.1088/1674-1137/abb4d4
| null |
nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Scrupulous theoretical study of 8Be nucleus states, both clustered and
non-clustered, is performed over a wide range of the excitation energies. The
quantities which characterize the degree of the alpha-clustering of these
states: spectroscopic factors, cluster form factors as well as the alpha-decay
widths are computed in the framework of an accurate ab initio approach
developed. Other basic properties of 8Be spectrum: the binding and excitation
energies, mean values of the isospin are calculated simultaneously. In the
majority of instances the results of the computations turn out to be in a good
agreement with the spectroscopic data. A number of predictions are made and
corresponding verification experiment is proposed. Prospects of the developed
approach for nuclear spectroscopy are demonstrated.
|
[{'version': 'v1', 'created': 'Fri, 26 Jun 2020 07:49:06 GMT'}]
|
2020-12-30
|
[array(['Rodkin', 'D. M.', ''], dtype=object)
array(["Tchuvil'sky", 'Yu. M.', ''], dtype=object)]
|
3,387 |
astro-ph/0607654
|
Hagai Netzer
|
Hagai Netzer, Benny Trakhtenbrot
|
Cosmic Evolution of Mass Accretion Rate and Metalicity in Active
Galactic Nuclei
|
10 pages 8 figures, accepted for publication in ApJ
|
Astrophys.J.654:754-763,2007
|
10.1086/509650
| null |
astro-ph
| null |
We present line and continuum measurements for 9818 SDSS type-I active
galactic nuclei (AGNs) with z le 0.75. The data are used to study the four
dimensional space of black hole mass, normalized accretion rate (Ledd),
metalicity and redshift. The main results are: 1. Ledd is smaller for larger
mass black holes at all redshifts. 2. For a given black hole mass Ledd propto
z^gamma or (1+z)^delta where the slope gamma increases with black hole mass.
The mean slope is similar to the star formation rate slope over the same
redshift interval. 3. The FeII/Hb line ratio is significantly correlated with
Ledd. It also shows a weaker negative dependence on redshift. Combined with the
known dependence of metalicity on accretion rate, we suggest that the FeII/Hb
line ratio is a metalicity indicator. 4. Given the measured accretion rates,
the growth times of most AGNs exceed the age of the universe. This suggests
past episodes of faster growth for all those sources. Combined with the FeII/Hb
result, we conclude that the broad emission lines metalicity goes through
cycles and is not a monotonously decreasing function of redshift. 5. FWHM(OIII)
is a poor proxy of sigma_* especially for high Ledd. 6. We define a group of
narrow line type-I AGNs (NLAGN1s) by their luminosity (or mass) dependent Hb
line width. Such objects have Ledd>0.25 and they comprise 8% of the type-I
population. Other interesting results include negative Baldwin relationships
for EW(Hb) and EW(FeII) and a relative increase of the red part of the Hb line
with luminosity.
|
[{'version': 'v1', 'created': 'Fri, 28 Jul 2006 18:49:34 GMT'}]
|
2008-11-26
|
[array(['Netzer', 'Hagai', ''], dtype=object)
array(['Trakhtenbrot', 'Benny', ''], dtype=object)]
|
3,388 |
1207.4264
|
Amitabha Chanda
|
Amitabha Chanda
|
A new signal processing tool developed with the help of the Clifford
algebra
|
12 pages, 2 figures
| null | null | null |
math.GM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A positive integer is expressed as a sum of squares of positive integers in a
unique way applying a special technique. The expression, thus obtained is
resolved into two factors using the concept of the Clifford algebra. This
technique is applied on a set of positive integers. Using these factors, a new
mean of the set of integers, different from the arithmetic mean, is developed.
A detailed discussion involving Cl(0,3) as an example is presented. The new
mean bears the imprint of degree of randomness of the data set. More random is
the data set more away is the new mean from the arithmetic mean. It is
suggested that this averaging technique may be useful in signal and image
processing with some special gain.
Keywords New mean, Clifford algebra.
|
[{'version': 'v1', 'created': 'Wed, 18 Jul 2012 04:57:00 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Sep 2012 16:41:59 GMT'}]
|
2012-09-19
|
[array(['Chanda', 'Amitabha', ''], dtype=object)]
|
3,389 |
2212.14292
|
Francesco Fournier-Facio
|
Sahana Balasubramanya, Francesco Fournier-Facio, Anthony Genevois,
Alessandro Sisto
|
Property (NL) for group actions on hyperbolic spaces
|
44 pages. Main paper by the first three authors, appendix by the
fourth author
| null | null | null |
math.GR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce Property (NL), which indicates that a group does not admit any
(isometric) action on a hyperbolic space with loxodromic elements. In other
words, such a group $G$ can only admit elliptic or horocyclic hyperbolic
actions, and consequently its poset of hyperbolic structures $\mathcal{H}(G)$
is trivial. It turns out that many groups satisfy this property; and we
initiate the formal study of this phenomenon. Of particular importance is the
proof of a dynamical criterion in this paper that ensures that groups with rich
actions on compact Hausdorff spaces have Property (NL). These include many
Thompson-like groups, such as $V, T$ and even twisted Brin--Thompson groups,
which implies that every finitely generated group quasi-isometrically embeds
into a finitely generated simple group with Property (NL). We also study the
stability of the property under group operations and explore connections to
other fixed point properties. In the appendix (by Alessandro Sisto) we describe
a construction of cobounded actions on hyperbolic spaces starting from
non-cobounded ones that preserves various properties of the initial action.
|
[{'version': 'v1', 'created': 'Thu, 29 Dec 2022 12:51:41 GMT'}]
|
2023-01-02
|
[array(['Balasubramanya', 'Sahana', ''], dtype=object)
array(['Fournier-Facio', 'Francesco', ''], dtype=object)
array(['Genevois', 'Anthony', ''], dtype=object)
array(['Sisto', 'Alessandro', ''], dtype=object)]
|
3,390 |
2203.11950
|
Jan Albert
|
Jan Albert, Leonardo Rastelli
|
Bootstrapping Pions at Large $N$
|
52+12 pages; 23 figures, v2: minor edits, references added
| null |
10.1007/JHEP08(2022)151
|
YITP-SB-2022-07
|
hep-th hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit from a modern bootstrap perspective the longstanding problem of
solving QCD in the large $N$ limit. We derive universal bounds on the effective
field theory of massless pions by imposing the full set of positivity
constraints that follow from $2 \to 2$ scattering. Some features of our
exclusion plots have intriguing connections with hadronic phenomenology. The
exclusion boundary exhibits a sharp kink, raising the tantalizing scenario that
large $N$ QCD may sit at this kink. We critically examine this possibility,
developing in the process a partial analytic understanding of the geometry of
the bounds.
|
[{'version': 'v1', 'created': 'Tue, 22 Mar 2022 18:00:00 GMT'}
{'version': 'v2', 'created': 'Tue, 14 Jun 2022 14:55:37 GMT'}]
|
2022-09-07
|
[array(['Albert', 'Jan', ''], dtype=object)
array(['Rastelli', 'Leonardo', ''], dtype=object)]
|
3,391 |
0909.5057
|
Julian Sitarek
|
J. Sitarek, W. Bednarek
|
Gamma-rays from the IC $e^\pm$ pair cascade in the radiation field of an
accretion disk: Application to CenA
|
7 pages, 4 figures, accepted for publication in MNRAS
| null |
10.1111/j.1365-2966.2009.15785.x
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The very short time scale variability of TeV $\gamma$-ray emission from
active galaxies suggests that the acceleration process of particles and the
production of primary $\gamma$-rays likely occurs relatively close to the
accretion disk. We calculate the $\gamma$-ray spectra produced in an Inverse
Compton $e^\pm$ pair cascade initiated by primary $\gamma$-rays which are
injected close to the surface of the accretion disk. Possible synchrotron
energy losses of secondary cascade $e^\pm$ pairs are also taken into account.
Since the soft radiation field is anisotropic, the resulting $\gamma$-ray
spectra strongly depend on the observation angle. We investigate their basic
properties for different parameters describing such a model. The model is
applied to the misaligned blazar Cen A recently detected in the TeV
$\gamma$-rays. We conclude on the site of the $\gamma$-ray emission region in
Cen A based on the comparison of the model with the observations of this source
in the GeV-TeV energy range.
|
[{'version': 'v1', 'created': 'Mon, 28 Sep 2009 10:37:18 GMT'}]
|
2015-05-14
|
[array(['Sitarek', 'J.', ''], dtype=object)
array(['Bednarek', 'W.', ''], dtype=object)]
|
3,392 |
1703.02818
|
Jean-Eric Campagne
|
J.-E. Campagne, S. Plaszczynski and J. Neveu
|
A direct method to compute the galaxy count angular correlation function
including redshift-space distortions
| null |
J.-E. Campagne et al 2017 ApJ 845 28
|
10.3847/1538-4357/aa7cf8
| null |
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the near future, cosmology will enter the wide and deep galaxy survey area
allowing high-precision studies of the large scale structure of the universe in
three dimensions. To test cosmological models and determine their parameters
accurately, it is natural to confront data with exact theoretical expectations
expressed in the observational parameter space (angles and redshift). The
data-driven galaxy number count fluctuations on redshift shells, can be used to
build correlation functions $C(\theta; z_1, z_2)$ on and between shells which
can probe the baryonic acoustic oscillations, the distance-redshift distortions
as well as gravitational lensing and other relativistic effects. Transforming
the model to the data space usually requires the computation of the angular
power spectrum $C_\ell(z_1, z_2)$ but this appears as an artificial and
inefficient step plagued by apodization issues. In this article we show that it
is not necessary and present a compact expression for $C(\theta; z_1, z_2)$
that includes directly the leading density and redshift space distortions terms
from the full linear theory. It can be evaluated using a fast integration
method based on Clenshaw-Curtis quadrature and Chebyshev polynomial series.
This new method to compute the correlation functions without any Limber
approximation, allows us to produce and discuss maps of the correlation
function directly in the observable space and is a significant step towards
disentangling the data from the tested models.
|
[{'version': 'v1', 'created': 'Wed, 8 Mar 2017 12:47:34 GMT'}
{'version': 'v2', 'created': 'Fri, 8 Sep 2017 08:32:19 GMT'}]
|
2017-09-11
|
[array(['Campagne', 'J. -E.', ''], dtype=object)
array(['Plaszczynski', 'S.', ''], dtype=object)
array(['Neveu', 'J.', ''], dtype=object)]
|
3,393 |
1703.09916
|
Zhengtao Wang
|
Zhengtao Wang, Ce Zhu, Zhiqiang Xia, Qi Guo, Yipeng Liu
|
Towards thinner convolutional neural networks through Gradually Global
Pruning
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deep network pruning is an effective method to reduce the storage and
computation cost of deep neural networks when applying them to resource-limited
devices. Among many pruning granularities, neuron level pruning will remove
redundant neurons and filters in the model and result in thinner networks. In
this paper, we propose a gradually global pruning scheme for neuron level
pruning. In each pruning step, a small percent of neurons were selected and
dropped across all layers in the model. We also propose a simple method to
eliminate the biases in evaluating the importance of neurons to make the scheme
feasible. Compared with layer-wise pruning scheme, our scheme avoid the
difficulty in determining the redundancy in each layer and is more effective
for deep networks. Our scheme would automatically find a thinner sub-network in
original network under a given performance.
|
[{'version': 'v1', 'created': 'Wed, 29 Mar 2017 07:31:46 GMT'}]
|
2017-03-30
|
[array(['Wang', 'Zhengtao', ''], dtype=object)
array(['Zhu', 'Ce', ''], dtype=object)
array(['Xia', 'Zhiqiang', ''], dtype=object)
array(['Guo', 'Qi', ''], dtype=object)
array(['Liu', 'Yipeng', ''], dtype=object)]
|
3,394 |
2210.10209
|
Prateek Yadav
|
Prateek Yadav, Mohit Bansal
|
Exclusive Supermask Subnetwork Training for Continual Learning
|
ACL Findings 2023 (17 pages, 7 figures)
| null | null | null |
cs.CV cs.AI cs.CL cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Continual Learning (CL) methods focus on accumulating knowledge over time
while avoiding catastrophic forgetting. Recently, Wortsman et al. (2020)
proposed a CL method, SupSup, which uses a randomly initialized, fixed base
network (model) and finds a supermask for each new task that selectively keeps
or removes each weight to produce a subnetwork. They prevent forgetting as the
network weights are not being updated. Although there is no forgetting, the
performance of SupSup is sub-optimal because fixed weights restrict its
representational power. Furthermore, there is no accumulation or transfer of
knowledge inside the model when new tasks are learned. Hence, we propose
ExSSNeT (Exclusive Supermask SubNEtwork Training), that performs exclusive and
non-overlapping subnetwork weight training. This avoids conflicting updates to
the shared weights by subsequent tasks to improve performance while still
preventing forgetting. Furthermore, we propose a novel KNN-based Knowledge
Transfer (KKT) module that utilizes previously acquired knowledge to learn new
tasks better and faster. We demonstrate that ExSSNeT outperforms strong
previous methods on both NLP and Vision domains while preventing forgetting.
Moreover, ExSSNeT is particularly advantageous for sparse masks that activate
2-10% of the model parameters, resulting in an average improvement of 8.3% over
SupSup. Furthermore, ExSSNeT scales to a large number of tasks (100). Our code
is available at https://github.com/prateeky2806/exessnet.
|
[{'version': 'v1', 'created': 'Tue, 18 Oct 2022 23:27:07 GMT'}
{'version': 'v2', 'created': 'Wed, 5 Jul 2023 16:57:43 GMT'}]
|
2023-07-06
|
[array(['Yadav', 'Prateek', ''], dtype=object)
array(['Bansal', 'Mohit', ''], dtype=object)]
|
3,395 |
2303.02043
|
Hamed Habibi Dr
|
D. M. K. K. Venkateswara Rao, Hamed Habibi, Jose Luis Sanchez-Lopez,
and Holger Voos
|
An Integrated Real-time UAV Trajectory Optimization with Potential Field
Approach for Dynamic Collision Avoidance
| null | null | null | null |
cs.RO cs.SY eess.SY
|
http://creativecommons.org/licenses/by/4.0/
|
This paper presents an integrated approach that combines trajectory
optimization and Artificial Potential Field (APF) method for real-time optimal
Unmanned Aerial Vehicle (UAV) trajectory planning and dynamic collision
avoidance. A minimum-time trajectory optimization problem is formulated with
initial and final positions as boundary conditions and collision avoidance as
constraints. It is transcribed into a nonlinear programming problem using
Chebyshev pseudospectral method. The state and control histories are
approximated by using Lagrange polynomials and the collocation points are used
to satisfy constraints. A novel sigmoid-type collision avoidance constraint is
proposed to overcome the drawbacks of Lagrange polynomial approximation in
pseudospectral methods that only guarantees inequality constraint satisfaction
only at nodal points. Automatic differentiation of cost function and
constraints is used to quickly determine their gradient and Jacobian,
respectively. An APF method is used to update the optimal control inputs for
guaranteeing collision avoidance. The trajectory optimization and APF method
are implemented in a closed-loop fashion continuously, but in parallel at
moderate and high frequencies, respectively. The initial guess for the
optimization is provided based on the previous solution. The proposed approach
is tested and validated through indoor experiments.
|
[{'version': 'v1', 'created': 'Fri, 3 Mar 2023 16:10:59 GMT'}]
|
2023-03-06
|
[array(['Rao', 'D. M. K. K. Venkateswara', ''], dtype=object)
array(['Habibi', 'Hamed', ''], dtype=object)
array(['Sanchez-Lopez', 'Jose Luis', ''], dtype=object)
array(['Voos', 'Holger', ''], dtype=object)]
|
3,396 |
2009.00504
|
Vincent Debets
|
Vincent E. Debets, Liesbeth M.C. Janssen, Cornelis Storm
|
Enhanced persistence and collective migration in cooperatively aligning
cell clusters
| null | null |
10.1016/j.bpj.2021.02.014
| null |
physics.bio-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Most cells possess the capacity to locomote. Alone or collectively, this
allows them to adapt, to rearrange, and to explore their surroundings. The
biophysical characterization of such motile processes, in health and disease,
has so far focused mostly on two limiting cases: single-cell motility on the
one hand, and the dynamics of confluent tissues such as the epithelium on the
other. The in-between regime of clusters, composed of relatively few cells,
moving as a coherent unit has received less attention. Such small clusters are,
however, deeply relevant in development but also in cancer metastasis. In this
work, we use cellular Potts models and analytical active matter theory to
understand how the motility of small cell clusters changes with N, the number
of cells in the cluster. Modeling and theory reveal our two main findings:
Cluster persistence time increases with N while the intrinsic diffusivity
decreases with N. We discuss a number of settings in which the motile
properties of more complex clusters can be analytically understood, revealing
that the focusing effects of small-scale cooperation and cell-cell alignment
can overcome the increased bulkiness and internal disorder of multicellular
clusters to enhance overall migrational efficacy. We demonstrate this
enhancement for small-cluster collective durotaxis, which is shown to proceed
more effectively than for single cells. Our results may provide some novel
insights into the connection between single-cell and large-scale collective
motion and may point the way to the biophysical origins of the enhanced
metastatic potential of small tumor cell clusters.
|
[{'version': 'v1', 'created': 'Tue, 1 Sep 2020 15:07:53 GMT'}]
|
2021-05-05
|
[array(['Debets', 'Vincent E.', ''], dtype=object)
array(['Janssen', 'Liesbeth M. C.', ''], dtype=object)
array(['Storm', 'Cornelis', ''], dtype=object)]
|
3,397 |
2012.07655
|
Walid Hariri
|
Walid Hariri, Ali Narin
|
Deep Neural Networks for COVID-19 Detection and Diagnosis using Images
and Acoustic-based Techniques: A Recent Review
| null | null | null | null |
cs.CV cs.LG cs.SD eess.AS
|
http://creativecommons.org/licenses/by/4.0/
|
The new coronavirus disease (COVID-19) has been declared a pandemic since
March 2020 by the World Health Organization. It consists of an emerging viral
infection with respiratory tropism that could develop atypical pneumonia.
Experts emphasize the importance of early detection of those who have the
COVID-19 virus. In this way, patients will be isolated from other people and
the spread of the virus can be prevented. For this reason, it has become an
area of interest to develop early diagnosis and detection methods to ensure a
rapid treatment process and prevent the virus from spreading. Since the
standard testing system is time-consuming and not available for everyone,
alternative early-screening techniques have become an urgent need. In this
study, the approaches used in the detection of COVID-19 based on deep learning
(DL) algorithms, which have been popular in recent years, have been
comprehensively discussed. The advantages and disadvantages of different
approaches used in literature are examined in detail. The Computed Tomography
of the chest and X-ray images give a rich representation of the patient's lung
that is less time-consuming and allows an efficient viral pneumonia detection
using the DL algorithms. The first step is the pre-processing of these images
to remove noise. Next, deep features are extracted using multiple types of deep
models (pre-trained models, generative models, generic neural networks, etc.).
Finally, the classification is performed using the obtained features to decide
whether the patient is infected by coronavirus or it is another lung disease.
In this study, we also give a brief review of the latest applications of cough
analysis to early screen the COVID-19, and human mobility estimation to limit
its spread.
|
[{'version': 'v1', 'created': 'Thu, 10 Dec 2020 19:52:12 GMT'}
{'version': 'v2', 'created': 'Sat, 23 Jan 2021 19:20:31 GMT'}
{'version': 'v3', 'created': 'Fri, 23 Apr 2021 19:41:59 GMT'}
{'version': 'v4', 'created': 'Sat, 1 May 2021 12:48:31 GMT'}]
|
2021-05-04
|
[array(['Hariri', 'Walid', ''], dtype=object)
array(['Narin', 'Ali', ''], dtype=object)]
|
3,398 |
2009.02355
|
Hesam Nejati Sharif Aldin
|
Hesam Nejati Sharif Aldin, Mostafa Razavi Ghods, Hossein Deldari
|
"Reduction of Monetary Cost in Cloud Storage System by Using Extended
Strict Timed Causal Consistency"
|
PDF-Latex, 15 pages, 15 pdf figures, 2 tables
| null | null | null |
cs.DC
|
http://creativecommons.org/licenses/by/4.0/
|
Cloud storage systems have been introduced to provide a scalable, secure,
reliable, and highly available data storage environment for the organizations
and end-users. Therefore, the service provider should grow in a geographical
extent. Consequently, extensive storage service provision requires a
replication mechanism. Replication imposes many costs on the cloud storage,
including the synchronization, communications, storage, etc., costs among the
replicas. Moreover, the synchronization process among replicas is a major
challenge in cloud storage. Therefore, consistency can be defined as the
coordination among the replicas. In this paper, we propose an extension to the
strict timed causal consistency by adding the considerations for the monetary
costs and the number of violations in the cloud storage systems and call it the
extended strict timed causal consistency. Our proposed supports monotonic read,
read your write, monotonic write, and write follow read, models by taking into
account the causal relations between users' operations, at the client-side.
Besides, it supports timed causal at the server-side. We employed the Cassandra
cloud database that supports various consistencies such as all, one, quorum,
etc. Our method performs better in reducing staleness rate, the severity of
violations, and monetary cost in comparison with all, one, quorum, and causal.
|
[{'version': 'v1', 'created': 'Fri, 4 Sep 2020 18:38:21 GMT'}]
|
2020-09-08
|
[array(['Aldin', 'Hesam Nejati Sharif', ''], dtype=object)
array(['Ghods', 'Mostafa Razavi', ''], dtype=object)
array(['Deldari', 'Hossein', ''], dtype=object)]
|
3,399 |
1910.13819
|
Caroline Ceribeli
|
Caroline Ceribeli, Henrique F. de Arruda, Luciano da F. Costa
|
How Coupled are Mass Spectrometry and Capillary Electrophoresis?
| null | null |
10.1007/s11192-021-03923-0
| null |
cs.DL cs.LG
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
The understanding of how science works can contribute to making scientific
development more effective. In this paper, we report an analysis of the
organization and interconnection between two important issues in chemistry,
namely mass spectrometry (MS) and capillary electrophoresis (CE). For that
purpose, we employed science of science techniques based on complex networks.
More specifically, we considered a citation network in which the nodes and
connections represent papers and citations, respectively. Interesting results
were found, including a good separation between some clusters of articles
devoted to instrumentation techniques and applications. However, the papers
that describe CE-MS did not lead to a well-defined cluster. In order to better
understand the organization of the citation network, we considered a
multi-scale analysis, in which we used the information regarding sub-clusters.
Firstly, we analyzed the sub-cluster of the first article devoted to the
coupling between CE and MS, which was found to be a good representation of its
sub-cluster. The second analysis was about the sub-cluster of a seminal paper
known to be the first that dealt with proteins by using CE-MS. By considering
the proposed methodologies, our paper paves the way for researchers working
with both techniques, since it elucidates the knowledge organization and can
therefore lead to better literature reviews.
|
[{'version': 'v1', 'created': 'Fri, 18 Oct 2019 23:40:27 GMT'}]
|
2021-03-16
|
[array(['Ceribeli', 'Caroline', ''], dtype=object)
array(['de Arruda', 'Henrique F.', ''], dtype=object)
array(['Costa', 'Luciano da F.', ''], dtype=object)]
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.