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1606.05267

Martina Donnari

M. Donnari, M. Arca-Sedda, M. Merafina

Can dark energy explain the observed outflow in galaxy clusters?

2 pages, 3 figures, 2 tables. To be published in the proceedings of 51th Rencontres de Moriond

astro-ph.CO astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Recent observations of the Virgo cluster and the Local Group suggested that some galaxies are flowing out from their parent cluster. This may be the signature that dark energy (DE) acts significantly also on small cosmological scales. By means of direct N-body simulations we performed several simulations, in which the effect of DE and gravity are taken into account, aiming to determine whether DE can produce an outflow of galaxies compatible with observations. Comparing the different simulations, our results suggest that the observed outflow of galaxies is likely due to the local effect of DE.

[{'version': 'v1', 'created': 'Wed, 15 Jun 2016 08:20:18 GMT'}]

2016-06-17

[array(['Donnari', 'M.', ''], dtype=object) array(['Arca-Sedda', 'M.', ''], dtype=object) array(['Merafina', 'M.', ''], dtype=object)]

2105.03173

Luigi Riso

Luigi Riso

Use of High Dimensional Modeling for automatic variables selection: the best path algorithm

stat.ML cs.LG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

This paper presents a new algorithm for automatic variables selection. In particular, using the Graphical Models properties it is possible to develop a method that can be used in the contest of large dataset. The advantage of this algorithm is that can be combined with different forecasting models. In this research we have used the OLS method and we have compared the result with the LASSO method.

[{'version': 'v1', 'created': 'Fri, 7 May 2021 11:33:06 GMT'} {'version': 'v2', 'created': 'Fri, 14 Jan 2022 10:59:20 GMT'}]

2022-01-17

[array(['Riso', 'Luigi', ''], dtype=object)]

1707.07972

Giancarlo Strinati Calvanese

S. Simonucci and G. Calvanese Strinati

Non-local equation for the superconducting gap parameter

10.1103/PhysRevB.96.054502

cond-mat.supr-con

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The properties are considered in detail of a non-local (integral) equation for the superconducting gap parameter, which is obtained by a coarse-graining procedure applied to the Bogoliubov-deGennes (BdG) equations over the whole coupling-vs-temperature phase diagram associated with the superfluid phase. It is found that the limiting size of the coarse-graining procedure, which is dictated by the range of the kernel of this integral equation, corresponds to the size of the Cooper pairs over the whole coupling-vs-temperature phase diagram up to the critical temperature, even when Cooper pairs turn into composite bosons on the BEC side of the BCS-BEC crossover. A practical method is further implemented to solve numerically this integral equation in an efficient way, which is based on a novel algorithm for calculating the Fourier transforms. Application of this method to the case of an isolated vortex, throughout the BCS-BEC crossover and for all temperatures in the superfluid phase, helps clarifying the nature of the length scales associated with a single vortex and the kinds of details that are in practice disposed off by the coarse-graining procedure on the BdG equations.

[{'version': 'v1', 'created': 'Tue, 25 Jul 2017 13:05:38 GMT'}]

2017-09-13

[array(['Simonucci', 'S.', ''], dtype=object) array(['Strinati', 'G. Calvanese', ''], dtype=object)]

1401.0344

Xin-Fa Deng

Xin-Fa Deng

Environmental dependence of different colors in the CMASS sample of the SDSS DR9

12 pages, 6 figures, accepted by RAA

10.1088/1674-4527/14/5/005

astro-ph.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this study, I investigate the environmental dependence of galaxy colors in the CMASS sample of the Sloan Digital Sky Survey Data Release 9 (SDSS DR9). To decrease the radial selection effect, I divide the CMASS sample into subsamples with a redshift binning size of 0.01 and analyze the environmental dependence of the u-r, u-g, g-r, r-i and i-z colors for these subsamples in each redshift bin. Statistical analysis shows that all the five colors weakly correlate with the local environment, which may mean that the environmental processes responsible for a galaxy's properties proceed slowly over cosmic time.

[{'version': 'v1', 'created': 'Wed, 1 Jan 2014 22:47:06 GMT'}]

2015-06-18

[array(['Deng', 'Xin-Fa', ''], dtype=object)]

cond-mat/0308413

C. A. Busser

C.A. B\"usser, Adriana Moreo and Elbio Dagotto

Unexpected Conductance Dip in the Kondo Regime of Linear Arrays of Quantum Dots

10.1103/PhysRevB.70.035402

cond-mat.mes-hall cond-mat.str-el

Using exact-diagonalization of small clusters and Dyson equation embedding techniques, the conductance $G$ of linear arrays of quantum dots is investigated. The Hubbard interaction induces Kondo peaks at low temperatures for an odd number of dots. Remarkably, the Kondo peak is split in half by a deep minimum, and the conductance vanishes at one value of the gate voltage. Tentative explanations for this unusual effect are proposed, including an interference process between two channels contributing to $G$, with one more and one less particle than the exactly-solved cluster ground-state. The Hubbard interaction and fermionic statistics of electrons also appear to be important to understand this phenomenon. Although most of the calculations used a particle-hole symmetric Hamiltonian and formalism, results also presented here show that the conductance dip exists even when this symmetry is broken. The conductance cancellation effect obtained using numerical techniques is potentially interesting, and other many-body techniques should be used to confirm its existence.

[{'version': 'v1', 'created': 'Wed, 20 Aug 2003 19:32:06 GMT'}]

2009-11-10

[array(['Büsser', 'C. A.', ''], dtype=object) array(['Moreo', 'Adriana', ''], dtype=object) array(['Dagotto', 'Elbio', ''], dtype=object)]

1801.05486

Ignacio Mart\'in-Navarro

Ignacio Martin-Navarro, Alexandre Vazdekis, Jesus Falcon-Barroso, Francesco La Barbera, Akin Yildirim, and Glenn van de Ven

Timing the formation and assembly of early-type galaxies via spatially resolved stellar populations analysis

Accepted for publication in MNRAS

10.1093/mnras/stx3346

astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

To investigate star formation and assembly processes of massive galaxies, we present here a spatially-resolved stellar populations analysis of a sample of 45 elliptical galaxies (Es) selected from the CALIFA survey. We find rather flat age and [Mg/Fe] radial gradients, weakly dependent on the effective velocity dispersion of the galaxy within half-light radius. However, our analysis shows that metallicity gradients become steeper with increasing galaxy velocity dispersion. In addition, we have homogeneously compared the stellar populations gradients of our sample of Es to a sample of nearby relic galaxies, i.e., local remnants of the high-z population of red nuggets. This comparison indicates that, first, the cores of present-day massive galaxies were likely formed in gas-rich, rapid star formation events at high redshift (z>2). This led to radial metallicity variations steeper than observed in the local Universe, and positive [Mg/Fe] gradients. Second, our analysis also suggests that a later sequence of minor dry mergers, populating the outskirts of early-type galaxies (ETGs), flattened the pristine [Mg/Fe] and metallicity gradients. Finally, we find a tight age-[Mg/Fe] relation, supporting that the duration of the star formation is the main driver of the [Mg/Fe] enhancement in massive ETGs. However, the star formation time-scale alone is not able to fully explain our [Mg/Fe] measurements. Interestingly, our results match the expected effect that a variable stellar initial mass function would have on the [Mg/Fe] ratio.

[{'version': 'v1', 'created': 'Tue, 16 Jan 2018 21:26:45 GMT'}]

2018-01-18

[array(['Martin-Navarro', 'Ignacio', ''], dtype=object) array(['Vazdekis', 'Alexandre', ''], dtype=object) array(['Falcon-Barroso', 'Jesus', ''], dtype=object) array(['La Barbera', 'Francesco', ''], dtype=object) array(['Yildirim', 'Akin', ''], dtype=object) array(['van de Ven', 'Glenn', ''], dtype=object)]

1112.1733

Petter Holme

Sungmin Lee, Petter Holme, Zhi-Xi Wu

Cooperation, structure and hierarchy in multiadaptive games

Phys. Rev. E. 84, 061148 (2011)

10.1103/PhysRevE.84.061148

q-bio.PE

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Game-theoretical models where the rules of the game and the interaction structure both coevolves with the game dynamics -- multiadaptive games -- capture very flexible situations where cooperation among selfish agents can emerge. In this work, we will discuss a multiadaptive model presented in a recent Letter [Phys. Rev. Lett. 106, 028702 (2011)], and generalizations of it. The model captures a non-equilibrium situation where social unrest increases the incentive to cooperate and, simultaneously, agents are partly free to influence with whom they interact. First, we investigate the details of how the feedback from the behavior of agents determines the emergence of cooperation and hierarchical contact structures. We also study the stability of the system to different types of noise, and find that different regions of parameter space show very different response. Some types of noise can destroy an all-cooperator state. If, on the other hand, hubs are stable, then so is the all-C state. Finally, we investigate the dependence of the ratio between the timescales of strategy updates and the evolution of the interaction structure. We find that a comparatively fast strategy dynamics is a prerequisite for the emergence of cooperation.

[{'version': 'v1', 'created': 'Wed, 7 Dec 2011 23:30:13 GMT'}]

2012-10-10

[array(['Lee', 'Sungmin', ''], dtype=object) array(['Holme', 'Petter', ''], dtype=object) array(['Wu', 'Zhi-Xi', ''], dtype=object)]

0912.3507

Sergio Iguri

Sergio Iguri, Toufik Mansour

Some recursive formulas for Selberg-type integrals

11 pages. To appear in Jour. Phys. A

J. Phys. A: Math. Theor. 43 065201 (2010)

10.1088/1751-8113/43/6/065201

math-ph hep-th math.MP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A set of recursive relations satisfied by Selberg-type integrals involving monomial symmetric polynomials are derived, generalizing previously known results. These formulas provide a well-defined algorithm for computing Selberg-Schur integrals whenever the Kostka numbers relating Schur functions and the corresponding monomial polynomials are explicitly known. We illustrate the usefulness of our results discussing some interesting examples.

[{'version': 'v1', 'created': 'Thu, 17 Dec 2009 20:17:57 GMT'}]

2010-04-06

[array(['Iguri', 'Sergio', ''], dtype=object) array(['Mansour', 'Toufik', ''], dtype=object)]

1705.07121

Mansaf Alam Dr

Kashish A. Shakil, Farhana J. Zareen, Mansaf Alam and Suraiya Jabin

BAMHealthCloud: A Biometric Authentication and Data Management System for Healthcare Data in Cloud

cs.CR cs.CY cs.DC

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Advancements in healthcare industry with new technology and population growth has given rise to security threat to our most personal data. The healthcare data management system consists of records in different formats such as text, numeric, pictures and videos leading to data which is big and unstructured. Also, hospitals have several branches at different locations throughout a country and overseas. In view of these requirements a cloud based healthcare management system can be an effective solution for efficient health care data management. One of the major concerns of a cloud based healthcare system is the security aspect. It includes theft to identity, tax fraudulence, insurance frauds, medical frauds and defamation of high profile patients. Hence, a secure data access and retrieval is needed in order to provide security of critical medical records in health care management system. Biometric authentication mechanism is suitable in this scenario since it overcomes the limitations of token theft and forgetting passwords in conventional token id-password mechanism used for providing security. It also has high accuracy rate for secure data access and retrieval. In this paper we propose BAMHealthCloud which is a cloud based system for management of healthcare data, it ensures security of data through biometric authentication. It has been developed after performing a detailed case study on healthcare sector in a developing country. Training of the signature samples for authentication purpose has been performed in parallel on hadoop MapReduce framework using Resilient Backpropagation neural network. From rigorous experiments it can be concluded that it achieves a speedup of 9x, Equal error rate (EER) of 0.12, sensitivity of 0.98 and specificity of 0.95 as compared to other approaches existing in literature.

[{'version': 'v1', 'created': 'Fri, 19 May 2017 11:00:40 GMT'}]

2017-05-23

[array(['Shakil', 'Kashish A.', ''], dtype=object) array(['Zareen', 'Farhana J.', ''], dtype=object) array(['Alam', 'Mansaf', ''], dtype=object) array(['Jabin', 'Suraiya', ''], dtype=object)]

0910.1522

Marc Dietrich

M. Dietrich, G. Thummes

Two-stage high frequency pulse tube cooler for refrigeration at 25 K

Cryogenics50:281-286, 2010

10.1016/j.cryogenics.2010.01.010

physics.ins-det

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A two-stage Stirling-type U-shape pulse tube cryocooler driven by a 10 kW-class linear compressor was designed, built and tested. A special feature of the cold head is the absence of a heat exchanger at the cold end of the first stage, since the intended application requires no cooling power at this intermediate temperature. Simulations where done using Sage-software to find optimum operating conditions and cold head geometry. Flow-impedance matching was required to connect the compressor designed for 60 Hz operation to the 40 Hz cold head. A cooling power of 12.9 W at 25 K with an electrical input power of 4.6 kW has been achieved up to now. The lowest temperature reached is 13.7 K.

[{'version': 'v1', 'created': 'Thu, 8 Oct 2009 14:56:28 GMT'} {'version': 'v2', 'created': 'Thu, 17 Dec 2009 15:41:25 GMT'}]

2014-11-20

[array(['Dietrich', 'M.', ''], dtype=object) array(['Thummes', 'G.', ''], dtype=object)]

2304.05966

Vasileios Theodorou

Ioannis Kalogeropoulos, Maria Eleftheria Vlontzou, Nikos Psaromanolakis, Eleni Zarogianni, Vasileios Theodorou

EdgeDS: Data Spaces enabled Multi-access Edge Computing

cs.NI

http://creativecommons.org/licenses/by/4.0/

The potential of Edge Computing technologies is yet to be exploited for multi-domain, multi-party data-driven systems. One aspect that needs to be tackled for the realization of envisioned open edge Ecosystems, is the secure and trusted exchange of data services among diverse stakeholders. In this work, we present a novel approach for integrating mechanisms for trustworthy and sovereign data exchange, into Multi-access Edge Computing (MEC) environments. To this end, we introduce an architecture that extends the ETSI MEC Architectural Framework with artifacts from the International Data Spaces Reference Architecture Model, accompanied by processes that automatically enrich Edge Computing applications with data space capabilities in an as-a-service paradigm. To validate our approach, we implement an open-source prototype solution and we conduct experiments that showcase its functionality and scalability. To our knowledge, this is one of the first concrete architectural specifications for enabling data space features in MEC systems.

[{'version': 'v1', 'created': 'Wed, 12 Apr 2023 16:41:21 GMT'}]

2023-04-13

[array(['Kalogeropoulos', 'Ioannis', ''], dtype=object) array(['Vlontzou', 'Maria Eleftheria', ''], dtype=object) array(['Psaromanolakis', 'Nikos', ''], dtype=object) array(['Zarogianni', 'Eleni', ''], dtype=object) array(['Theodorou', 'Vasileios', ''], dtype=object)]

cond-mat/0510152

Michael Pustilnik

M. Pustilnik, L. Borda

Phase transition, spin-charge separation, and spin filtering in a quantum dot

Phys. Rev. B 73, 201301(R) (2006)

10.1103/PhysRevB.73.201301

cond-mat.mes-hall

We consider low temperature transport through a lateral quantum dot asymmetrically coupled to two conducting leads, and tuned to the mixed-valence region separating two adjacent Coulomb blockade valleys with spin S=1/2 and S=1 on the dot. We demonstrate that this system exhibits a quantum phase transition driven by the gate voltage. In the vicinity of the transition the spin on the dot is quantized, even though the fluctuations of charge are strong. The spin-charge separation leads to an unusual Fano-like dependence of the conductance on the gate voltage and to an almost perfect spin polarization of the current through the dot in the presence of a magnetic field.

[{'version': 'v1', 'created': 'Thu, 6 Oct 2005 16:59:07 GMT'} {'version': 'v2', 'created': 'Sat, 1 Apr 2006 20:04:58 GMT'}]

2007-05-23

[array(['Pustilnik', 'M.', ''], dtype=object) array(['Borda', 'L.', ''], dtype=object)]

2108.08560

Florian Merkle

Florian Merkle, Maximilian Samsinger, Pascal Sch\"ottle

Pruning in the Face of Adversaries

cs.LG cs.CR

http://creativecommons.org/licenses/by/4.0/

The vulnerability of deep neural networks against adversarial examples - inputs with small imperceptible perturbations - has gained a lot of attention in the research community recently. Simultaneously, the number of parameters of state-of-the-art deep learning models has been growing massively, with implications on the memory and computational resources required to train and deploy such models. One approach to control the size of neural networks is retrospectively reducing the number of parameters, so-called neural network pruning. Available research on the impact of neural network pruning on the adversarial robustness is fragmentary and often does not adhere to established principles of robustness evaluation. We close this gap by evaluating the robustness of pruned models against L-0, L-2 and L-infinity attacks for a wide range of attack strengths, several architectures, data sets, pruning methods, and compression rates. Our results confirm that neural network pruning and adversarial robustness are not mutually exclusive. Instead, sweet spots can be found that are favorable in terms of model size and adversarial robustness. Furthermore, we extend our analysis to situations that incorporate additional assumptions on the adversarial scenario and show that depending on the situation, different strategies are optimal.

[{'version': 'v1', 'created': 'Thu, 19 Aug 2021 09:06:16 GMT'}]

2021-08-20

[array(['Merkle', 'Florian', ''], dtype=object) array(['Samsinger', 'Maximilian', ''], dtype=object) array(['Schöttle', 'Pascal', ''], dtype=object)]

2012.13522

Jianwen Xie

Jianwen Xie, Zilong Zheng, Ruiqi Gao, Wenguan Wang, Song-Chun Zhu, Ying Nian Wu

Generative VoxelNet: Learning Energy-Based Models for 3D Shape Synthesis and Analysis

16 pages. IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI) 2020. arXiv admin note: substantial text overlap with arXiv:1804.00586

cs.CV

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

3D data that contains rich geometry information of objects and scenes is valuable for understanding 3D physical world. With the recent emergence of large-scale 3D datasets, it becomes increasingly crucial to have a powerful 3D generative model for 3D shape synthesis and analysis. This paper proposes a deep 3D energy-based model to represent volumetric shapes. The maximum likelihood training of the model follows an "analysis by synthesis" scheme. The benefits of the proposed model are six-fold: first, unlike GANs and VAEs, the model training does not rely on any auxiliary models; second, the model can synthesize realistic 3D shapes by Markov chain Monte Carlo (MCMC); third, the conditional model can be applied to 3D object recovery and super resolution; fourth, the model can serve as a building block in a multi-grid modeling and sampling framework for high resolution 3D shape synthesis; fifth, the model can be used to train a 3D generator via MCMC teaching; sixth, the unsupervisedly trained model provides a powerful feature extractor for 3D data, which is useful for 3D object classification. Experiments demonstrate that the proposed model can generate high-quality 3D shape patterns and can be useful for a wide variety of 3D shape analysis.

[{'version': 'v1', 'created': 'Fri, 25 Dec 2020 06:09:36 GMT'}]

2020-12-29

[array(['Xie', 'Jianwen', ''], dtype=object) array(['Zheng', 'Zilong', ''], dtype=object) array(['Gao', 'Ruiqi', ''], dtype=object) array(['Wang', 'Wenguan', ''], dtype=object) array(['Zhu', 'Song-Chun', ''], dtype=object) array(['Wu', 'Ying Nian', ''], dtype=object)]

1601.01573

Mikko Laine

C. Christensen and M. Laine

Perturbative renormalization of the electric field correlator

15 pages. v2: published version

10.1016/j.physletb.2016.02.020

hep-lat

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The momentum diffusion coefficient of a heavy quark in a hot QCD plasma can be extracted as a transport coefficient related to the correlator of two colour-electric fields dressing a Polyakov loop. We determine the perturbative renormalization factor for a particular lattice discretization of this correlator within Wilson's SU(3) gauge theory, finding a ~12% NLO correction for values of the bare coupling used in the current generation of simulations. The impact of this result on existing lattice determinations is commented upon, and a possibility for non-perturbative renormalization through the gradient flow is pointed out.

[{'version': 'v1', 'created': 'Thu, 7 Jan 2016 15:48:11 GMT'} {'version': 'v2', 'created': 'Fri, 18 Mar 2016 16:14:33 GMT'}]

2016-03-23

[array(['Christensen', 'C.', ''], dtype=object) array(['Laine', 'M.', ''], dtype=object)]

1110.3948

Claudio Codella

C. Codella, C. Ceccarelli, S. Bottinelli, M. Salez, S. Viti, B. Lefloch, S. Cabrit, E. Caux, A. Faure, M. Vasta, L. Wiesenfeld

First detection of Hydrogen Chloride towards protostellar shocks

ApJ, in press

10.1088/0004-637X/744/2/164

astro-ph.GA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present the first detection of hydrogen chlorine in a protostellar shock, by observing the fundamental transition at 626 GHz with the Herschel HIFI spectrometer. We detected two of the three hyperfine lines, from which we derived a line opacity < 1. Using a non-LTE LVG code, we constrained the HCl column density, temperature and density of the emitting gas. The hypothesis that the emission originates in the molecular cloud is ruled out, as it would imply a too dense gas. Conversely, assuming that the emission originates in the 10"-15" size shocked gas previously observed at the IRAM PdB interferometer, we obtain: N(HCl)=0.7-2 x 10(13) cm-2, temperature > 15 K and density > 3 x 10(5) cm-3}. Combining with the Herschel HIFI CO(5-4) observations allows to further constrain the gas density and temperature, 10(5)-10(6) cm-3 and 120-250 K, as well as the HCl column density, 2 x 10(13) cm-2, and, finally, abundance: 3-6 x 10(-9). The estimated HCl abundance is consistent with that previously observed in low- and high- mass protostars. This puzzling result in the L1157-B1 shock, where species from volatile and refractory grains components are enhanced, suggests either that HCl is not the main reservoir of chlorine in the gas phase, against previous chemical models predictions, or that the elemental chlorine abundance is low in L1157-B1. Astrochemical modelling suggests that HCl is in fact formed in the gas phase, at low temperatures, prior to the occurance of the shock, and that the latter does not enhance its abundance.

[{'version': 'v1', 'created': 'Tue, 18 Oct 2011 12:06:32 GMT'}]

2015-05-30

[array(['Codella', 'C.', ''], dtype=object) array(['Ceccarelli', 'C.', ''], dtype=object) array(['Bottinelli', 'S.', ''], dtype=object) array(['Salez', 'M.', ''], dtype=object) array(['Viti', 'S.', ''], dtype=object) array(['Lefloch', 'B.', ''], dtype=object) array(['Cabrit', 'S.', ''], dtype=object) array(['Caux', 'E.', ''], dtype=object) array(['Faure', 'A.', ''], dtype=object) array(['Vasta', 'M.', ''], dtype=object) array(['Wiesenfeld', 'L.', ''], dtype=object)]

1212.0408

Serena Dipierro

Serena Dipierro, Andrea Pinamonti

Symmetry results for stable and monotone solutions to fibered systems of PDEs

math.AP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the symmetry properties for solutions of elliptic systems of the type {ll}-\dive(a_1(x,|\nabla u^1|(X))\nabla u^1(X))=F_{1}(x, u^1(X),..., u^n(X)), ... -\dive(a_n(x,|\nabla u^n|(X))\nabla u^n(X))=F_{n}(x, u^1(X),..., u^n(X)), where $x\in \R^m$ with $1\leq m< N$, $X=(x,y)\in \R^m\times \R^{N-m}$, and $F_{1},..., F_{n}$ are the derivatives with respect to $\xi^1,..., \xi^n$ of some $F=F(x,\xi^1,..., \xi^n)$ such that for any $i=1,..., n$ and any fixed $(x,\xi^1,..., \xi^{i-1},\xi^{i+1},..., \xi^n)\in \R^m\times \R^{n-1}$ the map $\xi^i\to F(x,\xi^1,...,\xi^i,..., \xi^n)$ belongs to $C^2(\R)$. We obtain a Poincar\'e-type formula for the solutions of the system and we use it to prove a symmetry result both for stable and for monotone solutions.

[{'version': 'v1', 'created': 'Mon, 3 Dec 2012 15:01:50 GMT'}]

2012-12-04

[array(['Dipierro', 'Serena', ''], dtype=object) array(['Pinamonti', 'Andrea', ''], dtype=object)]

2007.09308

Kazuhiro Morimoto

Kazuhiro Morimoto, Ming-Lo Wu, Andrei Ardelean, Edoardo Charbon

Superluminal Motion-Assisted 4-Dimensional Light-in-Flight Imaging

7 pages, 4 figures

Phys. Rev. X 11, 011005 (2021)

10.1103/PhysRevX.11.011005

physics.optics eess.IV

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Advances in high speed imaging techniques have opened new possibilities for capturing ultrafast phenomena such as light propagation in air or through media. Capturing light-in-flight in 3-dimensional xyt-space has been reported based on various types of imaging systems, whereas reconstruction of light-in-flight information in the fourth dimension z has been a challenge. We demonstrate the first 4-dimensional light-in-flight imaging based on the observation of a superluminal motion captured by a new time-gated megapixel single-photon avalanche diode camera. A high resolution light-in-flight video is generated with no laser scanning, camera translation, interpolation, nor dark noise subtraction. A machine learning technique is applied to analyze the measured spatio-temporal data set. A theoretical formula is introduced to perform least-square regression, and extra-dimensional information is recovered without prior knowledge. The algorithm relies on the mathematical formulation equivalent to the superluminal motion in astrophysics, which is scaled by a factor of a quadrillionth. The reconstructed light-in-flight trajectory shows a good agreement with the actual geometry of the light path. Our approach could potentially provide novel functionalities to high speed imaging applications such as non-line-of-sight imaging and time-resolved optical tomography.

[{'version': 'v1', 'created': 'Sat, 18 Jul 2020 01:56:45 GMT'}]

2021-01-13

[array(['Morimoto', 'Kazuhiro', ''], dtype=object) array(['Wu', 'Ming-Lo', ''], dtype=object) array(['Ardelean', 'Andrei', ''], dtype=object) array(['Charbon', 'Edoardo', ''], dtype=object)]

1908.10904

Chuhong Mai

Chuhong Mai, Michael R. Line

Exploring Exoplanet Cloud Assumptions in \textit{JWST} Transmission Spectra

26 pages, 23 figures, 4 tables; Accepted for publication in ApJ

10.3847/1538-4357/ab3e6d

astro-ph.EP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Clouds are ubiquitous in extrasolar planet atmospheres and are critical to our understanding of planetary climate and chemistry. They also represent one of the greater challenges to overcome when trying to interpret transit transmission spectra of exoplanet atmospheres as their presence can inhibit precise constraints on atmospheric composition and thermal properties. In this work we take a phenomenological approach towards understanding 1) our ability to constrain bulk cloud properties, and 2) the impact of clouds on constraining various atmospheric properties as obtained through transmission spectroscopy with the \textit{James Webb Space Telescope (JWST)}. We do this by exploring retrievals of atmospheric and cloud properties for a generic "hot-Jupiter" as a function of signal-to-noise ratio (SNR), \textit{JWST} observing modes and four different cloud parameterizations. We find that most key atmospheric and cloud inferences can be well constrained in the wavelength range ($\lambda = $ 0.6 - 11 $\mu$m), with NIRCam ($\lambda =$ 2.5 - 5 $\mu$m) being critical in inferring atmospheric properties and NIRISS + MIRI ($\lambda =$ 0.6 - 2.5, 5 - 11 $\mu$m) being necessary for good constraints on cloud parameters. However, constraining the cloud abundance and therefore the total cloud mass requires an observable cloud base in the transit geometry. While higher SNR observations can place tighter constraints on major parameters such as temperature, metallicity and cloud sedimentation, they are unable to eliminate strong degeneracies among cloud parameters. Our investigation of a generic "warm-Neptune" with photochemical haze parameterization also shows promising results in constraining atmospheric and haze properties in the cooler temperature regime.

[{'version': 'v1', 'created': 'Wed, 28 Aug 2019 18:52:34 GMT'}]

2019-10-09

[array(['Mai', 'Chuhong', ''], dtype=object) array(['Line', 'Michael R.', ''], dtype=object)]

1902.01133

Daniel Sablowski

Daniel P. Sablowski, Silva J\"arvinen, Ilya Ilyin, Klaus G. Strassmeier

Carbon 12C/13C isotope ratio of alpha Aurigae revised

accepted to A&A Letters to the Editor

A&A 622, L11 (2019)

10.1051/0004-6361/201834663

astro-ph.SR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Context. Capella ({\alpha} Aur) is one of the few binaries in the sky with two cool giant stars. With spectral types of G8III and G0III, the two components appear at different but distinct stages in their evolution. The G0 secondary star is a Hertzsprung-gap giant, and the G8 primary star is thought to be a clump giant. Aims. We present a new measure of the carbon 12 C/ 13 C isotope ratio of the primary component of Capella using high-resolution R $\approx$250 000 spectra obtained with the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) with both the Vatican Advanced Technology Telescope (VATT) and the Large Binocular Telescope (LBT). Methods. Signal-to-noise ratios of up to 2 700 were obtained by averaging nightly spectra. These average spectra were used to disentangle the two binary components. The isotope ratio was derived with the use of spectrum synthesis from the CN lines at 8004 {\AA}. Results. We found that the 12 C/ 13 C ratio of the primary component of Capella is 17.8$\pm$1.9. Our measurement precision is now primarily limited by the spectral-line data and by the grid-step size of the model atmospheres rather than the data. The separated spectrum of the secondary component does not show distinguishable 12 CN and 13 CN lines because of its v sin i and higher temperature. Conclusions. Our new 12 C/ 13 C value is significantly lower than the previous value of 27$\pm$4 but now agrees better with the recent model prediction of 18.8 - 20.7.

[{'version': 'v1', 'created': 'Mon, 4 Feb 2019 11:46:47 GMT'}]

2019-02-13

[array(['Sablowski', 'Daniel P.', ''], dtype=object) array(['Järvinen', 'Silva', ''], dtype=object) array(['Ilyin', 'Ilya', ''], dtype=object) array(['Strassmeier', 'Klaus G.', ''], dtype=object)]

2306.10245

Chi Cheuk Tsang

Chi Cheuk Tsang

On the set of normalized dilatations of fully-punctured pseudo-Anosov maps

80 pages, 31 figures

math.GT math.DS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We improve the bound on the number of tetrahedra in the veering triangulation of a fully-punctured pseudo-Anosov mapping torus in terms of the normalized dilatation. When the mapping torus has only one boundary component, we employ various techniques to improve the bound further. Together with the author's work with Hironaka in the case when the mapping torus has at least two boundary components, this allows us to understand small elements of the set $\mathcal{D}$ of normalized dilatations of fully-punctured pseudo-Anosov maps using computational means. In particular, we certify that the minimum element of $\mathcal{D}$ is $\mu^2$ and the minimum accumulation point of $\mathcal{D}$ is $\mu^4$, where $\mu = \frac{1 + \sqrt{5}}{2} \approx 1.618$ is the golden ratio.

[{'version': 'v1', 'created': 'Sat, 17 Jun 2023 03:11:51 GMT'}]

2023-06-21

[array(['Tsang', 'Chi Cheuk', ''], dtype=object)]

1806.02709

Reda Bellafqira

Reda Bellafqira, Gouenou Coatrieux, Emmanuelle Genin, Michel Cozic

Secure Multilayer Perceptron Based On Homomorphic Encryption

cs.CR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this work, we propose an outsourced Secure Multilayer Perceptron (SMLP) scheme where privacy and confidentiality of both the data and the model are ensured during the training and the classification phases. More clearly, this SMLP : i) can be trained by a cloud server based on data previously outsourced by a user in an homomorphically encrypted form; ii) its parameters are homomorphically encrypted giving thus no clues to the cloud; and iii) it can also be used for classifying new encrypted data sent by the user returning him the encrypted classification result encrypted. The originality of this scheme is threefold. To the best of our knowledge, it is the first multilayer perceptron (MLP) secured in its training phase over homomorphically encrypted data with no problem of convergence. And It does not require extra-communications between the server and the user. It is based on the Rectified Linear Unit (ReLU) activation function that we secure with no approximation contrarily to actual SMLP solutions. To do so, we take advantage of two semi-honest non-colluding servers. Experimental results carried out on a binary database encrypted with the Paillier cryptosystem demonstrate the overall performance of our scheme and its convergence.

[{'version': 'v1', 'created': 'Thu, 7 Jun 2018 14:39:21 GMT'}]

2018-06-08

[array(['Bellafqira', 'Reda', ''], dtype=object) array(['Coatrieux', 'Gouenou', ''], dtype=object) array(['Genin', 'Emmanuelle', ''], dtype=object) array(['Cozic', 'Michel', ''], dtype=object)]

2005.12215

Marco Chiani Dr.

Marco Chiani, Andrea Conti, Moe Z. Win

Piggybacking on Quantum Streams

Physical Review A (2020)

10.1103/PhysRevA.102.012410

quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

This paper shows that it is possible to piggyback classical information on a stream of qubits protected by quantum error correcting codes. The piggyback channel can be created by introducing intentional errors corresponding to a controlled sequence of syndromes. These syndromes are further protected, when quantum noise is present, by classical error correcting codes according to a performance-delay trade-off. Classical information can thus be added and extracted at arbitrary epochs without consuming additional quantum resources and without disturbing the quantum stream.

[{'version': 'v1', 'created': 'Mon, 25 May 2020 16:33:01 GMT'}]

2020-07-21

[array(['Chiani', 'Marco', ''], dtype=object) array(['Conti', 'Andrea', ''], dtype=object) array(['Win', 'Moe Z.', ''], dtype=object)]

astro-ph/0412095

Jamie Portsmouth

Jamie Portsmouth (Oxford), Edmund Bertschinger (MIT)

Kinetic theory of polarization in the Sunyaev-Zeldovich effect

12 pages, 4 figures

astro-ph

We apply the coherency tensor formalism to the calculation of the spectral distortions imprinted in the intensity and polarization of the cosmic microwave background radiation due to the kinematic and thermal Sunyaev-Zeldovich effects (SZE). We obtain the first relativistic corrections to the intensity produced by the kinematic and thermal SZE, and the first correction to the polarization magnitude due to electron thermal motion.

[{'version': 'v1', 'created': 'Fri, 3 Dec 2004 21:21:31 GMT'}]

2007-05-23

[array(['Portsmouth', 'Jamie', '', 'Oxford'], dtype=object) array(['Bertschinger', 'Edmund', '', 'MIT'], dtype=object)]

2203.08918

Valeriya Kotelnikova

Alexander Iksanov and Valeriya Kotelnikova

Small counts in nested Karlin's occupancy scheme generated by discrete Weibull-like distributions

math.PR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A nested Karlin's occupancy scheme is a symbiosis of classical Karlin's balls-in-boxes scheme and a weighted branching process. To define it, imagine a deterministic weighted branching process in which weights of the first generation individuals are given by the elements of a discrete probability distribution. For each positive integer $j$, identify the $j$th generation individuals with the $j$th generation boxes. The collection of balls is one and the same for all generations, and each ball starts at the root of the weighted branching process tree and moves along the tree according to the following rule: transition from a mother box to a daughter box occurs with probability given by the ratio of the daughter and mother weights. Assume that there are $n$ balls and that the discrete probability distribution responsible for the first generation is Weibull-like. Denote by $\mathcal{K}_n^{(j)}(l)$ and $\mathcal{K}_n^{*(j)}(l)$ the number of the $j$th generation boxes which contain at least $l$ balls and exactly $l$ balls, respectively. We prove functional limit theorems (FLTs) for the matrix-valued processes $\big(\mathcal{K}_{[{\rm e}^{T+\cdot}]}^{(j)}(l)\big)_{j,l\in\mathbb{N}}$ and $\big(\mathcal{ K}_{[{\rm e}^{T+\cdot}]}^{*(j)}(l)\big)_{j,l\in\mathbb{N}}$, properly normalized and centered, as $T\to \infty$. The present FLTs are an extension of a FLT proved by Iksanov, Kabluchko and Kotelnikova (2022) for the vector-valued process $\big(\mathcal{K}_{[{\rm e}^{T+\cdot}]}^{(j)}(1)\big)_{j\in\mathbb{N}}$. While the rows of each of the limit matrix-valued processes are independent and identically distributed, the entries within each row are stationary Gaussian processes with explicitly given covariances and cross-covariances. We provide an integral representation for each row. The results obtained are new even for Karlin's occupancy scheme.

[{'version': 'v1', 'created': 'Wed, 16 Mar 2022 20:04:38 GMT'}]

2022-03-18

[array(['Iksanov', 'Alexander', ''], dtype=object) array(['Kotelnikova', 'Valeriya', ''], dtype=object)]

2305.11112

Yunpeng Wang

Yunpeng Wang, Zelong Yuan, Jianchun Wang

Ensemble data assimilation-based mixed subgrid-scale model for large-eddy simulations

physics.flu-dyn

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

An ensemble Kalman filter (EnKF)-based mixed model (EnKF-MM) is proposed for the subgrid-scale (SGS) closure in the large-eddy simulation (LES) of turbulence. The model coefficients are determined through the EnKF-based data assimilation technique. The direct numerical simulation (DNS) results are filtered to obtain the benchmark data for LES. Reconstructing the correct kinetic energy spectrum of the filtered DNS (fDNS) data has been adopted as the target for the EnKF to optimize the coefficient of the functional part in the mixed model. The proposed EnKF-MM framework is subsequently tested in the LES of both the incompressible homogeneous isotropic turbulence (HIT) and turbulent mixing layer (TML). The performance of LES is comprehensively examined through the predictions of the flow statistics including the velocity spectrum, the probability density functions (PDFs) of the SGS stress, the PDF of the strain rate and the PDF of the SGS energy flux. The structure functions, the evolution of turbulent kinetic energy, the mean flow and the Reynolds stress profile, and the iso-surface of the Q-criterion are also examined to evaluate the spatial-temporal predictions by different SGS models. The results of the EnKF-MM framework are consistently more satisfying compared to the traditional SGS models, including the dynamic Smagorinsky model (DSM), the dynamic mixed model (DMM) and the velocity gradient model (VGM), demonstrating its great potential in the optimization of SGS models for LES of turbulence.

[{'version': 'v1', 'created': 'Thu, 18 May 2023 16:53:52 GMT'} {'version': 'v2', 'created': 'Thu, 1 Jun 2023 12:25:09 GMT'} {'version': 'v3', 'created': 'Thu, 6 Jul 2023 07:47:19 GMT'}]

2023-07-07

[array(['Wang', 'Yunpeng', ''], dtype=object) array(['Yuan', 'Zelong', ''], dtype=object) array(['Wang', 'Jianchun', ''], dtype=object)]

0710.0271

Christian Klingenberg F

Gui-Qiang Chen (1), Nadine Even (2), Christian Klingenberg (2) ((1) Northwestern Univ., (2) W\"urzburg Univ.)

Hyperbolic Conservation Laws and Hydrodynamic Limit for Particle Systems

math.AP math-ph math.MP

We study the following class of scalar hyperbolic conservation laws with discontinuous fluxes: \partial_t\rho+\partial_xF(x,\rho)=0. The main feature of such a conservation law is the discontinuity of the flux function in the space variable x. Kruzkov's approach for the L1-contraction does not apply since it requires the Lipschitz continuity of the flux function; and entropy solutions even for the Riemann problem are not unique under the classical entropy conditions. On the other hand, it is known that, in statistical mechanics, some microscopic interacting particle systems with discontinuous speed parameter lambda(x), in the hydrodynamic limit, formally lead to scalar hyperbolic conservation laws with discontinuous fluxes of the form: \partial_t\rho+\partial_x(\lambda(x)h(\rho))=0. The natural question arises which entropy solutions the hydrodynamic limit selects, thereby leading to a suitable, physical relevant notion of entropy solutions of this class of conservation laws. This paper is a first step and provides an answer to this question for a family of discontinuous flux functions. In particular, we identify the entropy condition for our PDE and proceed to show the well-posedness by combining our existence result with a uniqueness result of Audusse-Perthame (2005) for the family of flux functions; we establish a compactness framework for the hydrodynamic limit of large particle systems and the convergence of other approximate solutions to our PDE, which is based on the notion and reduction of measure-valued entropy solutions; and we finally establish the hydrodynamic limit for a ZRP with discontinuous speed-parameter governed by an entropy solution to our PDE.

[{'version': 'v1', 'created': 'Mon, 1 Oct 2007 11:54:25 GMT'}]

2007-10-02

[array(['Chen', 'Gui-Qiang', ''], dtype=object) array(['Even', 'Nadine', ''], dtype=object) array(['Klingenberg', 'Christian', ''], dtype=object)]

1401.3567

Youssef Khmou

Y.Khmou, S.Safi

2D Direction Of Arrival Estimation with Modified Propagator

4 pages, one latex file, 3 figures

cs.IT math.IT stat.AP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, a fast algorithm for the Direction Of Arrival (DOA) estimation of radiating sources, based on partial covariance matrix and without eigende- composition of incoming signals is extended to two dimensional problem of joint azimuth and elevation estimation angles using Uniform Circular Array (UCA) in case of non coherent narrowband signals. Simulation results are presented with both Additive White Gaussian Noise (AWGN) and real symmetric Toeplitz noise.

[{'version': 'v1', 'created': 'Wed, 15 Jan 2014 13:07:52 GMT'}]

2015-03-18

[array(['Khmou', 'Y.', ''], dtype=object) array(['Safi', 'S.', ''], dtype=object)]

2005.12566

Xingchen Li

Xingchen Li, Xiang Wang, Xiangnan He, Long Chen, Jun Xiao, Tat-Seng Chua

Hierarchical Fashion Graph Network for Personalized Outfit Recommendation

cs.IR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Fashion outfit recommendation has attracted increasing attentions from online shopping services and fashion communities.Distinct from other scenarios (e.g., social networking or content sharing) which recommend a single item (e.g., a friend or picture) to a user, outfit recommendation predicts user preference on a set of well-matched fashion items.Hence, performing high-quality personalized outfit recommendation should satisfy two requirements -- 1) the nice compatibility of fashion items and 2) the consistence with user preference. However, present works focus mainly on one of the requirements and only consider either user-outfit or outfit-item relationships, thereby easily leading to suboptimal representations and limiting the performance. In this work, we unify two tasks, fashion compatibility modeling and personalized outfit recommendation. Towards this end, we develop a new framework, Hierarchical Fashion Graph Network(HFGN), to model relationships among users, items, and outfits simultaneously. In particular, we construct a hierarchical structure upon user-outfit interactions and outfit-item mappings. We then get inspirations from recent graph neural networks, and employ the embedding propagation on such hierarchical graph, so as to aggregate item information into an outfit representation, and then refine a user's representation via his/her historical outfits. Furthermore, we jointly train these two tasks to optimize these representations. To demonstrate the effectiveness of HFGN, we conduct extensive experiments on a benchmark dataset, and HFGN achieves significant improvements over the state-of-the-art compatibility matching models like NGNN and outfit recommenders like FHN.

[{'version': 'v1', 'created': 'Tue, 26 May 2020 08:23:35 GMT'}]

2020-05-27

[array(['Li', 'Xingchen', ''], dtype=object) array(['Wang', 'Xiang', ''], dtype=object) array(['He', 'Xiangnan', ''], dtype=object) array(['Chen', 'Long', ''], dtype=object) array(['Xiao', 'Jun', ''], dtype=object) array(['Chua', 'Tat-Seng', ''], dtype=object)]

1609.09229

Eskil Rydhe

Eskil Rydhe

On the characterization of Triebel--Lizorkin type spaces of analytic functions

Journal of Fourier Analysis and Applications, 24(6) (2018), 1491-1517

10.1007/s00041-017-9584-0

math.FA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We consider different characterizations of Triebel--Lizorkin type spaces of analytic functions on the unit disc. Even though our results appear in the folklore, detailed descriptions are hard to find, and in fact we are unable to discuss the full range of parameters. Without additional effort we work with vector-valued analytic functions, and also consider a generalized scale of function spaces, including for example so-called $Q$-spaces. The primary aim of this note is to generalize, and clarify, a remarkable result by Cohn and Verbitsky, on factorization of Triebel--Lizorkin spaces. Their result remains valid for functions taking values in an arbitrary Banach space, provided that the vector-valuedness "sits in the right factor". On the other hand, if we impose vector-valuedness on the "wrong" factor, then the factorization fails even for separable Hilbert spaces.

[{'version': 'v1', 'created': 'Thu, 29 Sep 2016 07:17:19 GMT'}]

2018-12-03

[array(['Rydhe', 'Eskil', ''], dtype=object)]

1211.3934

Mikko Alava

Shao-Meng Qin, Hannu Verkasalo, Mikael Mohtaschemi, Tuomo Hartonen, Mikko Alava

Patterns, entropy, and predictability of human mobility and life

5 figures, for data see smartphonedata.aalto.fi, accepted to PLoS One

10.1371/journal.pone.0051353

physics.soc-ph cs.SI

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Cellular phones are now offering an ubiquitous means for scientists to observe life: how people act, move and respond to external influences. They can be utilized as measurement devices of individual persons and for groups of people of the social context and the related interactions. The picture of human life that emerges shows complexity, which is manifested in such data in properties of the spatiotemporal tracks of individuals. We extract from smartphone-based data for a set of persons important locations such as "home", "work" and so forth over fixed length time-slots covering the days in the data-set. This set of typical places is heavy-tailed, a power-law distribution with an exponent close to -1.7. To analyze the regularities and stochastic features present, the days are classified for each person into regular, personal patterns. To this are superimposed fluctuations for each day. This randomness is measured by "life" entropy, computed both before and after finding the clustering so as to subtract the contribution of a number of patterns. The main issue, that we then address, is how predictable individuals are in their mobility. The patterns and entropy are reflected in the predictability of the mobility of the life both individually and on average. We explore the simple approaches to guess the location from the typical behavior, and of exploiting the transition probabilities with time from location or activity A to B. The patterns allow an enhanced predictability, at least up to a few hours into the future from the current location. Such fixed habits are most clearly visible in the working-day length.

[{'version': 'v1', 'created': 'Fri, 16 Nov 2012 16:02:36 GMT'}]

2015-06-12

[array(['Qin', 'Shao-Meng', ''], dtype=object) array(['Verkasalo', 'Hannu', ''], dtype=object) array(['Mohtaschemi', 'Mikael', ''], dtype=object) array(['Hartonen', 'Tuomo', ''], dtype=object) array(['Alava', 'Mikko', ''], dtype=object)]

0805.1517

Haim Suchowski

Haim Suchowski, Dan Oron, Ady Arie and Yaron Silberberg

Geometrical Representation of Sum Frequency Generation and Adiabatic Frequency Conversion

4 pages, 4 figures

10.1103/PhysRevA.78.063821

physics.optics

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present a geometrical representation of sum frequency generation process in the undepleted pump approximation. The analogy of such dynamics with the known optical Bloch equations is discussed. We use this analogy to present a novel technique for the achievement of both high efficiency and large bandwidth in a sum frequency conversion processes using adiabatic inversion scheme, adapted from NMR and light-matter interaction. The adiabatic constraints are derived in this context. Last, this adiabatic frequency conversion scheme is realized experimentally by a proper design of adiabatic aperiodically poled KTP device, using quasi phased matched method. In the experiments we achieved high efficiency signal to idler conversion over a bandwidth of 140nm.

[{'version': 'v1', 'created': 'Sun, 11 May 2008 08:59:02 GMT'}]

2009-11-13

[array(['Suchowski', 'Haim', ''], dtype=object) array(['Oron', 'Dan', ''], dtype=object) array(['Arie', 'Ady', ''], dtype=object) array(['Silberberg', 'Yaron', ''], dtype=object)]

1912.03010

Yu Wu

Chengyi Wang, Yu Wu, Yujiao Du, Jinyu Li, Shujie Liu, Liang Lu, Shuo Ren, Guoli Ye, Sheng Zhao, Ming Zhou

Semantic Mask for Transformer based End-to-End Speech Recognition

cs.CL cs.SD eess.AS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Attention-based encoder-decoder model has achieved impressive results for both automatic speech recognition (ASR) and text-to-speech (TTS) tasks. This approach takes advantage of the memorization capacity of neural networks to learn the mapping from the input sequence to the output sequence from scratch, without the assumption of prior knowledge such as the alignments. However, this model is prone to overfitting, especially when the amount of training data is limited. Inspired by SpecAugment and BERT, in this paper, we propose a semantic mask based regularization for training such kind of end-to-end (E2E) model. The idea is to mask the input features corresponding to a particular output token, e.g., a word or a word-piece, in order to encourage the model to fill the token based on the contextual information. While this approach is applicable to the encoder-decoder framework with any type of neural network architecture, we study the transformer-based model for ASR in this work. We perform experiments on Librispeech 960h and TedLium2 data sets, and achieve the state-of-the-art performance on the test set in the scope of E2E models.

[{'version': 'v1', 'created': 'Fri, 6 Dec 2019 07:55:04 GMT'} {'version': 'v2', 'created': 'Mon, 16 Mar 2020 02:41:44 GMT'}]

2020-03-17

[array(['Wang', 'Chengyi', ''], dtype=object) array(['Wu', 'Yu', ''], dtype=object) array(['Du', 'Yujiao', ''], dtype=object) array(['Li', 'Jinyu', ''], dtype=object) array(['Liu', 'Shujie', ''], dtype=object) array(['Lu', 'Liang', ''], dtype=object) array(['Ren', 'Shuo', ''], dtype=object) array(['Ye', 'Guoli', ''], dtype=object) array(['Zhao', 'Sheng', ''], dtype=object) array(['Zhou', 'Ming', ''], dtype=object)]

2011.06336

Neha Singh

Neha Singh and Tomasz Bulik

Constraining parameters of coalescing stellar mass binary black hole systems with the Einstein Telescope alone

13 pages, 7 figures. Published in Physical Review D

Phys. Rev. D 104, 043014 (2021)

10.1103/PhysRevD.104.043014

Virgo document number VIR-0876B-20

astro-ph.HE gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The Einstein Telescope (ET) is the future third generation gravitational wave detector consisting of three independent interferometers arranged in a triangular configuration, with the sensitivity large enough to be able to detect stellar mass black holes even beyond the redshift of 10. In this paper, we analyze the capabilities of ET as a standalone instrument and not part of a network. We show that the analysis of detection of binary coalescences in the three individual interferometers of the ET allow us to weakly constrain the sky location of the source. We present the analysis that leads to the constraints on the redshift and source frame chirp mass of detected binaries. We show that these values can be estimated with the accuracy comparable to the one expected from networks of gravitational wave interferometers. Thus, we show that the ET as a single instrument is able to break the redshift - chirp mass degeneracy and is therefore a valuable tool to explore properties of populations of merging compact object binaries.

[{'version': 'v1', 'created': 'Thu, 12 Nov 2020 12:10:15 GMT'} {'version': 'v2', 'created': 'Mon, 16 Aug 2021 17:55:12 GMT'}]

2021-08-25

[array(['Singh', 'Neha', ''], dtype=object) array(['Bulik', 'Tomasz', ''], dtype=object)]

1802.02625

Lilia Anguelova

Lilia Anguelova, Peter Suranyi and L.C. Rohana Wijewardhana

On Non-slow Roll Inflationary Regimes

10 pages, contribution to the proceedings of the 10th International Symposium "Quantum Theory and Symmetries", 2017

Springer Proc. Math. Stat. 255 (2018) 161-171

hep-th astro-ph.CO gr-qc hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We summarize our work on constant roll inflationary models. It was understood recently that constant roll inflation, in a regime beyond the slow roll approximation, can give models that are in agreement with the observational constraints. We describe a new class of constant roll inflationary models and investigate the behavior of scalar perturbations in them. We also comment on other non-slow roll regimes of inflation.

[{'version': 'v1', 'created': 'Wed, 7 Feb 2018 20:43:41 GMT'}]

2018-11-14

[array(['Anguelova', 'Lilia', ''], dtype=object) array(['Suranyi', 'Peter', ''], dtype=object) array(['Wijewardhana', 'L. C. Rohana', ''], dtype=object)]

quant-ph/9504018

Haret Rosu

H.C. Rosu, M. Reyes, K.B. Wolf, O. Obreg\'on

Supersymmetric features of the Maxwell fish-eye lens

5 pages in Latex, one figure not included has been published as Fig. 2 in Phys. Lett. A 208 (1995) 33-39

SPIE Vol. 2730 (1996) 436-439

10.1117/12.231113

IFUG-95/05 r

quant-ph

We provide a supersymmetric analysis of the Maxwell fisheye (MF) wave problem at zero energy. Working in the so-called $R_{0}=0$ sector, we obtain the corresponding superpartner (fermionic) MF effective potential within Witten's one-dimensional (radial) supersymmetric procedure.

[{'version': 'v1', 'created': 'Wed, 26 Apr 1995 03:36:00 GMT'} {'version': 'v2', 'created': 'Mon, 5 Jun 1995 03:30:00 GMT'} {'version': 'v3', 'created': 'Wed, 24 Apr 1996 17:03:00 GMT'}]

2015-06-26

[array(['Rosu', 'H. C.', ''], dtype=object) array(['Reyes', 'M.', ''], dtype=object) array(['Wolf', 'K. B.', ''], dtype=object) array(['Obregón', 'O.', ''], dtype=object)]

1811.06723

Sandra Carillo

Sandra Carillo, Michel Chipot, Vanda Valente and Giorgio Vergara Caffarelli

On weak regularity requirements of the relaxation modulus in viscoelasticity

Communications Applied Industrial Mathematics, Volume 10 Issue 1, 2019, 78-87

10.2478/caim-2019-0014

math-ph math.AP math.MP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The existence and uniqueness of solution to a one-dimensional hyperbolic integro-differential problem arising in viscoelasticity is here considered. The kernel, in the linear viscoelasticity equation, represents the relaxation function which is characteristic of the considered material. Specifically, the case of a kernel, which does not satisfy the classical regularity requirements is analysed. This choice is suggested by applications according to the literature to model a wider variety of materials. A notable example of kernel, not satisfying the classical regularity requirements, is represented by a wedge continuous function. Indeed, the linear integro-differential viscoelasticity equation, characterised by a suitable wedge continuous relaxation function, is shown to give the classical linear wave equation via a limit procedure.

[{'version': 'v1', 'created': 'Fri, 16 Nov 2018 09:37:28 GMT'}]

2019-06-03

[array(['Carillo', 'Sandra', ''], dtype=object) array(['Chipot', 'Michel', ''], dtype=object) array(['Valente', 'Vanda', ''], dtype=object) array(['Caffarelli', 'Giorgio Vergara', ''], dtype=object)]

1710.08118

Yunzhong Chen

Y. Z. Chen, M. D\"obeli, E. Pomjakushina, Y. L. Gan, N. Pryds, and T. Lippert

Scavenging of oxygen vacancies at modulation-doped oxide interfaces: Evidence from oxygen isotope tracing

to be apprear in PRMater, 2017

cond-mat.mtrl-sci

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The introduction of manganite buffer layers, La7/8Sr1/8MnO3 (LSMO) in particular, at the metallic interface between SrTiO3 (STO) and another band insulator suppresses the carrier density of the interfacial two-dimensional electron gas (2DEG) and improves significantly the electron mobility. However, the mechanisms underlying the extreme mobility enhancement remain elusive. Herein, we used 18O isotope exchanged SrTi18O3 as substrates to create 2DEG at room temperature with and without the LSMO buffer layer. By mapping the oxygen profile across the interface between STO18 and disordered LaAlO3 or yttria-stabilized zirconia (YSZ), we provide unambiguous evidence that redox reactions occur at oxide interfaces even grown at room temperature. Moreover, the manganite buffer layer not only suppresses the carrier density but also strongly suppresses the oxygen exchange dynamics of the STO substrate, which likely prevents the reduction of STO during the formation of the 2DEG. The underlying mechanism on the enhanced electron mobility at buffered oxide interfaces is also discussed.

[{'version': 'v1', 'created': 'Mon, 23 Oct 2017 07:26:37 GMT'}]

2017-10-24

[array(['Chen', 'Y. Z.', ''], dtype=object) array(['Döbeli', 'M.', ''], dtype=object) array(['Pomjakushina', 'E.', ''], dtype=object) array(['Gan', 'Y. L.', ''], dtype=object) array(['Pryds', 'N.', ''], dtype=object) array(['Lippert', 'T.', ''], dtype=object)]

astro-ph/0406557

Marijke Haverkorn

M. Haverkorn, P. Katgert, A. G. de Bruyn

Properties of the warm magnetized ISM, as inferred from WSRT polarimetric imaging

12 pages, 6 figures, accepted by A&A

Astron.Astrophys. 427 (2004) 169-177

10.1051/0004-6361:200400042

astro-ph

We describe a first attempt to derive properties of the regular and turbulent Galactic magnetic field from multi-frequency polarimetric observations of the diffuse Galactic synchrotron background. A single-cell-size model of the thin Galactic disk is constructed which includes random and regular magnetic fields and thermal and relativistic electrons. The disk is irradiated from behind with a uniform partially polarized background. Radiation from the background and from the thin disk is Faraday rotated and depolarized while propagating through the medium. The model parameters are estimated from a comparison with 350 MHz observations in two regions at intermediate latitudes done with the Westerbork Synthesis Radio Telescope. We obtain good consistency between the estimates for the random and regular magnetic field strengths and typical scales of structure in the two regions. The regular magnetic field strength found is a few microGauss, and the ratio of random to regular magnetic field strength is 0.7 +/- 0.5, for a typical scale of the random component of 15 +/- 10 pc. Furthermore, the regular magnetic field is directed almost perpendicular to the line of sight. This modeling is a potentially powerful method to estimate the structure of the Galactic magnetic field, especially when more polarimetric observations of the diffuse synchrotron background at intermediate latitudes become available.

[{'version': 'v1', 'created': 'Thu, 24 Jun 2004 19:12:24 GMT'}]

2009-11-10

[array(['Haverkorn', 'M.', ''], dtype=object) array(['Katgert', 'P.', ''], dtype=object) array(['de Bruyn', 'A. G.', ''], dtype=object)]

1310.6867

Peter Vancso

P\'eter Vancs\'o, G\'eza I. M\'ark, Philippe Lambin, Alexandre Mayer, Chanyong Hwang and L\'aszl\'o P. Bir\'o

Effect of the disorder in graphene grain boundaries: A wave packet dynamics study

Applied Surface Science (2013)

10.1016/j.apsusc.2013.09.127

cond-mat.mes-hall

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Chemical vapor deposition (CVD) on Cu foil is one of the most promising methods to produce graphene samples despite of introducing numerous grain boundaries into the perfect graphene lattice. A rich variety of GB structures can be realized experimentally by controlling the parameters in the CVD method. Grain boundaries contain non-hexagonal carbon rings (4,5,7,8 membered rings) and vacancies in various ratios and arrangements. Using wave packet dynamic (WPD) simulations and tight-binding electronic structure calculations, we have studied the effect of the structure of GBs on the transport properties. Three model GBs with increasing disorder were created in the computer: a periodic 5-7 GB, a "serpentine" GB, and a disordered GB containing 4,8 membered rings and vacancies. It was found that for small energies (E=EF+-1eV) the transmission decreases with increasing disorder. Four membered rings and vacancies are identified as the principal scattering centres. Revealing the connection between the properties of GBs and the CVD growth method may open new opportunities in the graphene based nanoelectronics.

[{'version': 'v1', 'created': 'Fri, 25 Oct 2013 10:10:38 GMT'}]

2013-10-28

[array(['Vancsó', 'Péter', ''], dtype=object) array(['Márk', 'Géza I.', ''], dtype=object) array(['Lambin', 'Philippe', ''], dtype=object) array(['Mayer', 'Alexandre', ''], dtype=object) array(['Hwang', 'Chanyong', ''], dtype=object) array(['Biró', 'László P.', ''], dtype=object)]

1301.5938

Chiara Orsini

Chiara Orsini, Enrico Gregori, Luciano Lenzini, Dmitri Krioukov

Evolution of the Internet k-dense structure

13 pages

IEEE/ACM Transactions on Networking (TON), Volume 22 Issue 6, December 2014, Pages 1769-1780

10.1109/TNET.2013.2282756

cs.SI cs.NI physics.soc-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

As the Internet AS-level topology grows over time, some of its structural properties remain unchanged. Such time- invariant properties are generally interesting, because they tend to reflect some fundamental processes or constraints behind Internet growth. As has been shown before, the time-invariant structural properties of the Internet include some most basic ones, such as the degree distribution or clustering. Here we add to this time-invariant list a non-trivial property - k-dense decomposition. This property is derived from a recursive form of edge multiplicity, defined as the number of triangles that share a given edge. We show that after proper normalization, the k- dense decomposition of the Internet has remained stable over the last decade, even though the Internet size has approximately doubled, and so has the k-density of its k-densest core. This core consists mostly of content providers peering at Internet eXchange Points, and it only loosely overlaps with the high-degree or high-rank AS core, consisting mostly of tier-1 transit providers. We thus show that high degrees and high k-densities reflect two different Internet-specific properties of ASes (transit versus content providers). As a consequence, even though degrees and k-densities of nodes are correlated, the relative fluctuations are strong, and related to that, random graphs with the same degree distribution or even degree correlations as in the Internet, do not reproduce its k-dense decomposition. Therefore an interesting open question is what Internet topology models or generators can fully explain or at least reproduce the k-dense properties of the Internet.

[{'version': 'v1', 'created': 'Fri, 25 Jan 2013 01:10:42 GMT'} {'version': 'v2', 'created': 'Fri, 1 Feb 2013 01:16:01 GMT'} {'version': 'v3', 'created': 'Wed, 7 Aug 2013 20:09:29 GMT'} {'version': 'v4', 'created': 'Mon, 28 Oct 2013 16:48:47 GMT'} {'version': 'v5', 'created': 'Thu, 13 Aug 2015 18:42:45 GMT'}]

2015-08-14

[array(['Orsini', 'Chiara', ''], dtype=object) array(['Gregori', 'Enrico', ''], dtype=object) array(['Lenzini', 'Luciano', ''], dtype=object) array(['Krioukov', 'Dmitri', ''], dtype=object)]

1709.08352

Vincent Cros

J.-Y. Chauleau, W. Legrand, N. Reyren, D. Maccariello, S. Collin, H. Popescu, K. Bouzehouane, V. Cros, N. Jaouen, and A. Fert

Chirality in magnetic multilayers probed by the symmetry and the amplitude of dichroism in X-ray resonant magnetic scattering

8 pages, 3 figures

Phys. Rev. Lett. 120, 037202 (2018)

10.1103/PhysRevLett.120.037202

cond-mat.mtrl-sci cond-mat.other

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Chirality in condensed matter is now a topic of the utmost importance because of its significant role in the understanding and mastering of a large variety of new fundamental physicals mechanisms. Versatile experimental approaches, capable to reveal easily the exact winding of order parameters are therefore essential. Here we report X-ray resonant magnetic scattering (XRMS) as a straightforward tool to identify directly the properties of chiral magnetic systems. We show that it can straight-forwardly and unambiguously determine the main characteristics of chiral magnetic distributions: i.e. its chiral nature, the quantitative winding sense (clockwise or counter-clockwise) and its type (N\'eel/cycloidal or Bloch/helical). This method is model-independent, does not require a-priori knowledge of magnetic parameters and can be applied to any system with magnetic domains ranging from few nanometers (wavelength limited) to several microns. By using prototypical multilayers with tailored magnetic chiralities based on the Co|Pt interface we illustrate the strength of this method.

[{'version': 'v1', 'created': 'Mon, 25 Sep 2017 07:16:49 GMT'}]

2018-01-24

[array(['Chauleau', 'J. -Y.', ''], dtype=object) array(['Legrand', 'W.', ''], dtype=object) array(['Reyren', 'N.', ''], dtype=object) array(['Maccariello', 'D.', ''], dtype=object) array(['Collin', 'S.', ''], dtype=object) array(['Popescu', 'H.', ''], dtype=object) array(['Bouzehouane', 'K.', ''], dtype=object) array(['Cros', 'V.', ''], dtype=object) array(['Jaouen', 'N.', ''], dtype=object) array(['Fert', 'A.', ''], dtype=object)]

math-ph/9904030

Oswaldo Monteiro Del Cima

O.M. Del Cima, D.H.T. Franco, J.A. Helayel-Neto and O. Piguet

An algebraic proof on the finiteness of Yang-Mills-Chern-Simons theory in D=3

5 pages, revtex

Lett.Math.Phys.47:265,1999

10.1023/A:1007595121742

TUW-98-12

math-ph math.MP

A rigorous algebraic proof of the full finiteness in all orders of perturbation theory is given for the Yang-Mills-Chern-Simons theory in a general three-dimensional Riemannian manifold. We show the validity of a trace identity, playing the role of a local form of the Callan-Symanzik equation, in all loop orders, which yields the vanishing of the beta-functions associated to the topological mass and gauge coupling constant as well as the anomalous dimensions of the fields.

[{'version': 'v1', 'created': 'Tue, 27 Apr 1999 14:15:56 GMT'}]

2010-02-05

[array(['Del Cima', 'O. M.', ''], dtype=object) array(['Franco', 'D. H. T.', ''], dtype=object) array(['Helayel-Neto', 'J. A.', ''], dtype=object) array(['Piguet', 'O.', ''], dtype=object)]

1704.06690

Hung-Hsi Lin Hung-Hsi Lin

Hung-Hsi Lin, Felipe Vallini, Mu-Han Yang, Rajat Sharma, Matthew W. Puckett, Sergio Montoya, Christian D. Wurm, Eric E. Fullerton, and Yeshaiahu Fainman

Electronic Metamaterials with Tunable Second-order Optical Nonlinearities

12 pages, 4 figures, 1 table

physics.optics

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The ability to engineer metamaterials with tunable nonlinear optical properties is crucial for nonlinear optics. Traditionally, metals have been employed to enhance nonlinear optical interactions through field localization. Here, inspired by the electronic properties of materials, we introduce and demonstrate experimentally an asymmetric metal-semiconductor-metal (MSM) metamaterial that exhibits a large and electronically tunable effective second-order optical susceptibility (\c{hi}(2)). The induced \c{hi}(2) originates from the interaction between the third-order optical susceptibility of the semiconductor (\c{hi}(3)) with the engineered internal electric field resulting from the two metals with dissimilar work function at its interfaces. We demonstrate a five times larger second-harmonic intensity from the MSM metamaterial, compared to contributions from its constituents with electrically tunable nonlinear coefficient ranging from 2.8 to 15.6 pm/V.

[{'version': 'v1', 'created': 'Fri, 21 Apr 2017 19:45:52 GMT'}]

2017-04-25

[array(['Lin', 'Hung-Hsi', ''], dtype=object) array(['Vallini', 'Felipe', ''], dtype=object) array(['Yang', 'Mu-Han', ''], dtype=object) array(['Sharma', 'Rajat', ''], dtype=object) array(['Puckett', 'Matthew W.', ''], dtype=object) array(['Montoya', 'Sergio', ''], dtype=object) array(['Wurm', 'Christian D.', ''], dtype=object) array(['Fullerton', 'Eric E.', ''], dtype=object) array(['Fainman', 'Yeshaiahu', ''], dtype=object)]

2109.10358

Kevin Kelly

Andr\'e de Gouv\^ea, Patrick J. Fox, Boris J. Kayser, and Kevin J. Kelly

Characterizing Heavy Neutral Fermions via their Decays

28 pages plus references, 19 figures. Comments welcome

10.1103/PhysRevD.105.015019

FERMILAB-PUB-21-453-T, NUHEP-TH/21-11

hep-ph hep-ex

http://creativecommons.org/licenses/by/4.0/

Many extensions of the Standard Model of particle physics contain new electrically-neutral fermions. Should one of these particles be discovered, questions will naturally arise regarding its nature. For instance: is it a self-conjugate particle (i.e., is it a Dirac or a Majorana fermion)?, does it interact via the Standard Model force carriers or something else? One set of well-motivated particles in this class are Heavy Neutral Leptons (HNLs), Standard Model gauge-singlet fermions that mix with the neutrinos and may be produced in meson decays. We demonstrate that measuring the three body decays of the HNL (or phenomenologically similar heavy fermions) can help determine whether they are Majorana or Dirac fermions. We also investigate the ability to distinguish among different models for the physics responsible for the HNL decay. We compare the reach assuming full and partial event reconstruction, and propose experimental analyses. Should a new fermion be discovered, studying its three body decays provides a powerful diagnostic tool of its nature.

[{'version': 'v1', 'created': 'Tue, 21 Sep 2021 18:00:01 GMT'}]

2022-02-02

[array(['de Gouvêa', 'André', ''], dtype=object) array(['Fox', 'Patrick J.', ''], dtype=object) array(['Kayser', 'Boris J.', ''], dtype=object) array(['Kelly', 'Kevin J.', ''], dtype=object)]

1312.6387

Graham Kells

G. Kells, D. Sen, J.K. Slingerland and S. Vishveshwara

Topological Blocking in Quantum Quench Dynamics

18 pages, 11 figures

Phys. Rev. B 89, 235130 (2014)

10.1103/PhysRevB.89.235130

cond-mat.str-el cond-mat.stat-mech

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the non-equilibrium dynamics of quenching through a quantum critical point in topological systems, focusing on one of their defining features: ground state degeneracies and associated topological sectors. We present the notion of 'topological blocking', experienced by the dynamics due to a mismatch in degeneracies between two phases and we argue that the dynamic evolution of the quench depends strongly on the topological sector being probed. We demonstrate this interplay between quench and topology in models stemming from two extensively studied systems, the transverse Ising chain and the Kitaev honeycomb model. Through non-local maps of each of these systems, we effectively study spinless fermionic $p$-wave paired superconductors. Confining the systems to ring and toroidal geometries, respectively, enables us to cleanly address degeneracies, subtle issues of fermion occupation and parity, and mismatches between topological sectors. We show that various features of the quench, which are related to Kibble-Zurek physics, are sensitive to the topological sector being probed, in particular, the overlap between the time-evolved initial ground state and an appropriate low-energy state of the final Hamiltonian. While most of our study is confined to translationally invariant systems, where momentum is a convenient quantum number, we briefly consider the effect of disorder and illustrate how this can influence the quench in a qualitatively different way depending on the topological sector considered.

[{'version': 'v1', 'created': 'Sun, 22 Dec 2013 14:34:31 GMT'} {'version': 'v2', 'created': 'Fri, 17 Jan 2014 10:08:27 GMT'}]

2014-07-02

[array(['Kells', 'G.', ''], dtype=object) array(['Sen', 'D.', ''], dtype=object) array(['Slingerland', 'J. K.', ''], dtype=object) array(['Vishveshwara', 'S.', ''], dtype=object)]

hep-ph/9704298

Bryan Webber

Yu.L. Dokshitzer and B.R. Webber

Power Corrections to Event Shape Distributions

11 pages, LaTeX, 2 figures; further reference to related work by Korchemsky and Sterman added 30/4/97

Phys.Lett. B404 (1997) 321-327

10.1016/S0370-2693(97)00573-X

Cavendish-HEP-97/2

hep-ph

We estimate the effects of non-perturbative physics on the differential distributions of infrared- and collinear-safe $e^+e^-$ event shape variables, by extending the notion of an infrared-regular effective strong coupling, which accounts for the non-perturbative corrections to the mean values of several shape variables, to their distributions. This leads to $1/Q$ power corrections over a range of values of the shape variables considered, where $Q$ is the centre-of-mass energy. In the case of the thrust variable, the leading correction is simply a shift of the distribution, by an amount proportional to $1/Q$. We show that this gives an excellent description of the data throughout a wide range of $T$ and $Q$.

[{'version': 'v1', 'created': 'Fri, 11 Apr 1997 17:34:27 GMT'} {'version': 'v2', 'created': 'Wed, 30 Apr 1997 09:45:28 GMT'}]

2009-10-30

[array(['Dokshitzer', 'Yu. L.', ''], dtype=object) array(['Webber', 'B. R.', ''], dtype=object)]

quant-ph/9511034

Andrei Kirilyuk

Andrei P. Kirilyuk

Causal Wave Mechanics and the Advent of Complexity. I. Dynamic multivaluedness

21 pages, PostScript 3.0 from an MS Word file; material is included into the author's book "Universal Concept of Complexity by the Dynamic Redundance Paradigm: Causal Randomness, Complete Wave Mechanics, and the Ultimate Unification of Knowledge" (Naukova Dumka, Kiev, 1997), 550 p., in English, see also physics/9806002; new format of presentation and linguistic changes in the revised version, no changes in the essential contents

Ann. Fond. Louis de Broglie 21 (1996) 455-480

Preprint IMP-95-1

quant-ph chao-dyn nlin.CD

Two major deviations from causality in the existing formulations of quantum mechanics, related respectively to quantum chaos and indeterminate wave reduction, are eliminated within the new, universal concept of dynamic complexity. The analysis involves a new paradigm for description of a system with interaction, the principle of dynamic multivaluedness (redundance), and the ensuing concept of the fundamental dynamic uncertainty. It is shown that both the wave reduction and truly unpredictable (chaotic) behaviour in quantum systems can be completely and causally understood as a higher sublevel of the same dynamic complexity that provides the causally complete picture of the unified wave-particle duality and relativity at its lowest level (quant-ph/9902015,16). The presentation is divided into five parts. The first three parts deal with intrinsic randomness in Hamiltonian (isolated) quantum systems as the basic case of dynamical chaos. In the last two parts a causal solution to the problem of quantum indeterminacy and wave reduction is proposed. Part I introduces the method of effective dynamical functions as a generalisation of the optical potential formalism. The method provides a legal transformation of the Schroedinger equation revealing the hidden multivaluedness of interaction process, i. e. its self-consistent, dynamical splitting into many equally real, but mutually incompatible branches, called 'realisations'. Each realisation incorporates the usual "complete" set of eigenfunctions and eigenvalues for the entire problem. The method is presented in detail for the Hamiltonian system with periodic (not small) perturbation, both in its time-independent and time-dependent versions.

[{'version': 'v1', 'created': 'Thu, 23 Nov 1995 21:05:35 GMT'} {'version': 'v2', 'created': 'Thu, 25 Mar 1999 08:50:12 GMT'}]

2008-02-03

[array(['Kirilyuk', 'Andrei P.', ''], dtype=object)]

2010.07653

Kristina Kvashnina

Firoz Alam, K. David Wegner, Stephanie Pouget, Lucia Amidani, Kristina Kvashnina, Dmitry Aldakov, Peter Reiss

Eu$^{2+}$: a suitable substituent for Pb$^{2+}$ in CsPbX$_3$ perovskite nanocrystals?

The Journal of Chemical Physics (2019)

10.1063/1.5126473

physics.chem-ph

http://creativecommons.org/licenses/by/4.0/

Eu$^{2+}$ is used to replace toxic Pb$^{2+}$ in metal halide perovskite nanocrystals (NCs). The synthesis implies injection of cesium oleate into a solution of europium (II) bromide at an experimentally determined optimum temperature of 130C and a reaction time of 60s. Structural analysis indicates the formation of spherical CsEuBr$_3$ nanoparticles with a mean size of 43nm. Using EuI$_2$ instead of EuBr$_2$ leads to the formation of 18nm CsI nanoparticles, while EuCl$_2$ does not show any reaction with cesium oleate forming 80nm EuCl2 nanoparticles. The obtained CsEuBr3 NCs exhibit bright blue emission at 413nm (FWHM 30 nm) with a room temperature photoluminescence quantum yield of 39%. The emission originates from the Laporte-allowed 4f7-4f65d1 transition of Eu$^{2+}$ and shows a PL decay time of 263ns. The long-term stability of the optical properties is observed, making inorganic lead-free CsEuBr$_3$ NCs promising deep blue emitters for optoelectronics.

[{'version': 'v1', 'created': 'Thu, 15 Oct 2020 10:39:25 GMT'}]

2020-10-16

[array(['Alam', 'Firoz', ''], dtype=object) array(['Wegner', 'K. David', ''], dtype=object) array(['Pouget', 'Stephanie', ''], dtype=object) array(['Amidani', 'Lucia', ''], dtype=object) array(['Kvashnina', 'Kristina', ''], dtype=object) array(['Aldakov', 'Dmitry', ''], dtype=object) array(['Reiss', 'Peter', ''], dtype=object)]

1507.07623

Hyeong-Kwan Ju

Daeseok Lee and Hyeong-Kwan Ju

Different Volume Computation Methods of Graph Polytopes

14 pages, no figure

math.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The aim of this work is to introduce several different volume computation methods of the graph polytope associated with various type of finite simple graphs. Among them, we obtained the recursive volume formula (RVF) that is fundamental and most useful to compute the volume of the graph polytope for an arbitrary finite simple graph.

[{'version': 'v1', 'created': 'Tue, 28 Jul 2015 02:23:55 GMT'}]

2015-07-29

[array(['Lee', 'Daeseok', ''], dtype=object) array(['Ju', 'Hyeong-Kwan', ''], dtype=object)]

1605.06217

Xiao Liu

Xiao Liu, Jiang Wang, Shilei Wen, Errui Ding, Yuanqing Lin

Localizing by Describing: Attribute-Guided Attention Localization for Fine-Grained Recognition

cs.CV

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A key challenge in fine-grained recognition is how to find and represent discriminative local regions. Recent attention models are capable of learning discriminative region localizers only from category labels with reinforcement learning. However, not utilizing any explicit part information, they are not able to accurately find multiple distinctive regions. In this work, we introduce an attribute-guided attention localization scheme where the local region localizers are learned under the guidance of part attribute descriptions. By designing a novel reward strategy, we are able to learn to locate regions that are spatially and semantically distinctive with reinforcement learning algorithm. The attribute labeling requirement of the scheme is more amenable than the accurate part location annotation required by traditional part-based fine-grained recognition methods. Experimental results on the CUB-200-2011 dataset demonstrate the superiority of the proposed scheme on both fine-grained recognition and attribute recognition.

[{'version': 'v1', 'created': 'Fri, 20 May 2016 05:54:54 GMT'} {'version': 'v2', 'created': 'Mon, 23 May 2016 03:37:54 GMT'}]

2016-05-24

[array(['Liu', 'Xiao', ''], dtype=object) array(['Wang', 'Jiang', ''], dtype=object) array(['Wen', 'Shilei', ''], dtype=object) array(['Ding', 'Errui', ''], dtype=object) array(['Lin', 'Yuanqing', ''], dtype=object)]

2011.09666

Wenhua Wang

Wenhua Wang, Xiong Liu, Aiting Wang and Baode Li

Molecular Decomposition of Anisotropic Hardy Spaces with Variable Exponents

23 Pages. arXiv admin note: text overlap with arXiv:1705.05188 by other authors

math.CA

http://creativecommons.org/licenses/by-sa/4.0/

Let $A$ be an expansive dilation on $\mathbb{R}^n$, and $p(\cdot):\mathbb{R}^n\rightarrow(0,\,\infty)$ be a variable exponent function satisfying the globally log-H\"{o}lder continuous condition. Let $H^{p(\cdot)}_A({\mathbb {R}}^n)$ be the variable anisotropic Hardy space defined via the non-tangential grand maximal function. In this paper, the authors establish its molecular decomposition, which is still new even in the classical isotropic setting (in the case $A:=2\mathrm I_{n\times n}$). As applications, the authors obtain the boundedness of anisotropic Calder\'on-Zygmund operators from $H^{p(\cdot)}_{A}(\mathbb{R}^n)$ to $L^{p(\cdot)}(\mathbb{R}^n)$ or from $H^{p(\cdot)}_{A}(\mathbb{R}^n)$ to itself.

[{'version': 'v1', 'created': 'Wed, 18 Nov 2020 08:39:12 GMT'}]

2020-11-20

[array(['Wang', 'Wenhua', ''], dtype=object) array(['Liu', 'Xiong', ''], dtype=object) array(['Wang', 'Aiting', ''], dtype=object) array(['Li', 'Baode', ''], dtype=object)]

2106.11257

Alexander Borzunov

Eduard Gorbunov, Alexander Borzunov, Michael Diskin, Max Ryabinin

Secure Distributed Training at Scale

Accepted to International Conference on Machine Learning (ICML 2022). 61 pages, 10 figures. The version 4 fixes inaccuracies in the proofs of Lemmas E.2 and E.4. Code: https://github.com/yandex-research/btard

cs.LG cs.DC math.OC

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Many areas of deep learning benefit from using increasingly larger neural networks trained on public data, as is the case for pre-trained models for NLP and computer vision. Training such models requires a lot of computational resources (e.g., HPC clusters) that are not available to small research groups and independent researchers. One way to address it is for several smaller groups to pool their computational resources together and train a model that benefits all participants. Unfortunately, in this case, any participant can jeopardize the entire training run by sending incorrect updates, deliberately or by mistake. Training in presence of such peers requires specialized distributed training algorithms with Byzantine tolerance. These algorithms often sacrifice efficiency by introducing redundant communication or passing all updates through a trusted server, making it infeasible to apply them to large-scale deep learning, where models can have billions of parameters. In this work, we propose a novel protocol for secure (Byzantine-tolerant) decentralized training that emphasizes communication efficiency.

[{'version': 'v1', 'created': 'Mon, 21 Jun 2021 17:00:42 GMT'} {'version': 'v2', 'created': 'Thu, 7 Oct 2021 15:31:02 GMT'} {'version': 'v3', 'created': 'Tue, 28 Jun 2022 15:58:24 GMT'} {'version': 'v4', 'created': 'Mon, 2 Jan 2023 03:24:04 GMT'}]

2023-01-03

[array(['Gorbunov', 'Eduard', ''], dtype=object) array(['Borzunov', 'Alexander', ''], dtype=object) array(['Diskin', 'Michael', ''], dtype=object) array(['Ryabinin', 'Max', ''], dtype=object)]

1210.7639

Benjamin Jourdain

Benjamin Jourdain, Tony Leli\`evre, B{\l}a\.zej Miasojedow

Optimal scaling for the transient phase of the random walk Metropolis algorithm: The mean-field limit

Published at http://dx.doi.org/10.1214/14-AAP1048 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)

Annals of Applied Probability 2015, Vol. 25, No. 4, 2263-2300

10.1214/14-AAP1048

IMS-AAP-AAP1048

math.PR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We consider the random walk Metropolis algorithm on $\mathbb{R}^n$ with Gaussian proposals, and when the target probability measure is the $n$-fold product of a one-dimensional law. In the limit $n\to\infty$, it is well known (see [Ann. Appl. Probab. 7 (1997) 110-120]) that, when the variance of the proposal scales inversely proportional to the dimension $n$ whereas time is accelerated by the factor $n$, a diffusive limit is obtained for each component of the Markov chain if this chain starts at equilibrium. This paper extends this result when the initial distribution is not the target probability measure. Remarking that the interaction between the components of the chain due to the common acceptance/rejection of the proposed moves is of mean-field type, we obtain a propagation of chaos result under the same scaling as in the stationary case. This proves that, in terms of the dimension $n$, the same scaling holds for the transient phase of the Metropolis-Hastings algorithm as near stationarity. The diffusive and mean-field limit of each component is a diffusion process nonlinear in the sense of McKean. This opens the route to new investigations of the optimal choice for the variance of the proposal distribution in order to accelerate convergence to equilibrium (see [Optimal scaling for the transient phase of Metropolis-Hastings algorithms: The longtime behavior Bernoulli (2014) To appear]).

[{'version': 'v1', 'created': 'Mon, 29 Oct 2012 12:30:46 GMT'} {'version': 'v2', 'created': 'Wed, 18 Dec 2013 08:51:15 GMT'} {'version': 'v3', 'created': 'Fri, 19 Jun 2015 07:49:36 GMT'}]

2016-08-14

[array(['Jourdain', 'Benjamin', ''], dtype=object) array(['Lelièvre', 'Tony', ''], dtype=object) array(['Miasojedow', 'Błażej', ''], dtype=object)]

1609.03109

Amr Abdelaziz

Amr Abdelaziz, Ron Burton and C. Emre Koksal

Message Authentication and Secret Key Agreement in VANETs via Angle of Arrival

cs.CR

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In the scope of VANETs, nature of exchanged safety/warning messages renders itself highly location dependent as it is usually for incident reporting. Thus, vehicles are required to periodically exchange beacon messages that include speed, time and GPS location information. In this paper paper, we present a physical layer assisted message authentication scheme that uses Angle of Arrival (AoA) estimation to verify the message originator location based on the claimed location information. Within the considered vehicular communication settings, fundamental limits of AoA estimation are developed in terms of its Cramer Rao Bound (CRB) and existence of efficient estimator. The problem of deciding whether the received signal is originated from the claimed GPS location is formulated as a two sided hypotheses testing problem whose solution is given by Wald test statics. Moreover, we use correct decision, $P_D$, and false alarm, $P_F$, probabilities as a quantitative performance measure. The observation posterior likelihood function is shown to satisfy regularity conditions necessary for asymptotic normality of the ML-AoA estimator. Thus, we give $P_D$ and $P_F$ in a closed form. We extend the potential of physical layer contribution in security to provide physical layer assisted secret key agreement (SKA) protocol. A public key (PK) based SKA in which communicating vehicles are required to validate their respective physical location. We show that the risk of the Man in the Middle attack, which is common in PK-SKA protocols without a trusted third party, is waived up to the literal meaning of the word "middle".

[{'version': 'v1', 'created': 'Sun, 11 Sep 2016 02:23:47 GMT'}]

2016-09-13

[array(['Abdelaziz', 'Amr', ''], dtype=object) array(['Burton', 'Ron', ''], dtype=object) array(['Koksal', 'C. Emre', ''], dtype=object)]

2009.00302

Nikolay Gulitskiy Dr.

N. V. Antonov, N. M. Gulitskiy, P. I. Kakin, G. E. Kochnev

Effects of turbulent environment on self-organized critical behavior: Isotropy vs Anisotropy

Universe 6, 145 (2020)

10.3390/universe6090145

cond-mat.stat-mech

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study a self-organized critical system under influence of turbulent motion of the environment. The system is described by the anisotropic continuous stochastic equation proposed by Hwa and Kardar [{\it Phys. Rev. Lett.} {\bf 62}: 1813 (1989)]. The motion of the environment is modelled by the isotropic Kazantsev--Kraichnan "rapid-change" ensemble for an incompressible fluid: it is Gaussian with vanishing correlation time and the pair correlation function of the form $\propto\delta(t-t') / k^{d+\xi}$, where $k$ is the wave number and $\xi$ is an arbitrary exponent with the most realistic values $\xi = 4/3$ (Kolmogorov turbulence) and $\xi \to 2$ (Batchelor's limit). Using the field-theoretic renormalization group, we find infrared attractive fixed points of the renormalization group equation associated with universality classes, i.e., with regimes of critical behavior. The most realistic values of the spatial dimension $d=2$ and the exponent $\xi=4/3$ correspond to the universality class of pure turbulent advection where the nonlinearity of the Hwa--Kardar (HK) equation is irrelevant. Nevertheless, the universality class where both the (anisotropic) nonlinearity of the HK equation and the (isotropic) advecting velocity field are relevant also exists for some values of the parameters $\varepsilon=4-d$ and $\xi$. Depending on what terms (anisotropic, isotropic, or both) are relevant in specific universality class, different types of scaling behavior (ordinary one or generalized) are established.

[{'version': 'v1', 'created': 'Tue, 1 Sep 2020 09:12:22 GMT'}]

2020-09-22

[array(['Antonov', 'N. V.', ''], dtype=object) array(['Gulitskiy', 'N. M.', ''], dtype=object) array(['Kakin', 'P. I.', ''], dtype=object) array(['Kochnev', 'G. E.', ''], dtype=object)]

1710.04106

Jorge Vel\'azquez-Castro PhD

Jorge Vel\'azquez-Castro, Andr\'es Anzo-Hern\'andez, Beatriz Bonilla-Capilla, Mois\'es Soto-Bajo, Andr\'es Fraguela-Collar

Vector-borne disease risk indexes in spatially structured populations

16 pages, 5 figures

q-bio.PE math.DS

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

There are economic and physical limitations when applying prevention and control strategies for urban vector borne diseases. Consequently, there are increasing concerns and interest in designing efficient strategies and regulations that health agencies can follow in order to reduce the imminent impact of viruses like Dengue, Zika and Chikungunya. That includes fumigation, abatization, reducing the hatcheries, picking up trash, information campaigns. A basic question that arise when designing control strategies is about which and where these ones should focus. In other words, one would like to know whether preventing the contagion or decrease vector population, and in which area of the city, is more efficient. In this work, we propose risk indexes based on the idea of secondary cases from patch to patch. Thus, they take into account human mobility and indicate which patch has more chance to be a corridor for the spread of the disease and which is more vulnerable. They can also indicate the neighborhood where hatchery control will reduce more the number of potential cases. In order to illustrate the usefulness of these indexes, we run a set of numerical simulations in a mathematical model that takes into account the urban mobility and the differences in population density among the areas of a city. If i is a particular neighborhood, the transmission risk index TR_i measures the potential secondary cases caused by a host in that neighborhood. The vector transmission risk index VTR_i measures the potential secondary cases caused by a vector. Finally, the vulnerability risk index VR_i measures the potential secondary cases in the neighborhood. Transmission indexes can be used to give geographical priority to some neighborhoods when applying prevention and control measures. On the other hand, the vulnerability index can be useful to implement monitoring campaigns or public health investment.

[{'version': 'v1', 'created': 'Wed, 11 Oct 2017 15:16:47 GMT'}]

2017-10-12

[array(['Velázquez-Castro', 'Jorge', ''], dtype=object) array(['Anzo-Hernández', 'Andrés', ''], dtype=object) array(['Bonilla-Capilla', 'Beatriz', ''], dtype=object) array(['Soto-Bajo', 'Moisés', ''], dtype=object) array(['Fraguela-Collar', 'Andrés', ''], dtype=object)]

2111.04488

Luca Giorgetti

Luca Giorgetti

A planar algebraic description of conditional expectations

20 pages

Internat. J. Math. 33 (2022) 2250037

10.1142/S0129167X22500379

math.OA math.CT math.QA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Let $\mathcal{N}\subset\mathcal{M}$ be a unital inclusion of arbitrary von Neumann algebras. We give a 2-{$C^*$}-categorical/planar algebraic description of normal faithful conditional expectations $E:\mathcal{M}\to\mathcal{N}\subset\mathcal{M}$ with finite index and their duals $E':\mathcal{N}'\to\mathcal{M}'\subset\mathcal{N}'$ by means of the solutions of the conjugate equations for the inclusion morphism $\iota:\mathcal{N}\to\mathcal{M}$ and its conjugate morphism $\overline{\iota}:\mathcal{M}\to\mathcal{N}$. In particular, the theory of index for conditional expectations admits a 2-{$C^*$}-categorical formulation in full generality. Moreover, we show that a pair $(\mathcal{N}\subset\mathcal{M}, E)$ as above can be described by a Q-system, and vice versa. These results are due to Longo in the subfactor/simple tensor unit case [Lon90, Thm.\ 5.2], [Lon94, Thm.\ 5.1].

[{'version': 'v1', 'created': 'Mon, 8 Nov 2021 13:24:48 GMT'} {'version': 'v2', 'created': 'Mon, 31 Oct 2022 16:53:00 GMT'}]

2022-11-01

[array(['Giorgetti', 'Luca', ''], dtype=object)]

0709.3371

Zhiyong Wang

M. Ablikim, J. Z. Bai, et al

Search for the C-parity violating process J/psi->gamma gamma via psi(2S)->pi+pi- J/psi

4 pages 2 figures

Phys.Rev.D76:117101,2007

10.1103/PhysRevD.76.117101

hep-ex

Using 14.0\times 10^6 \psi(2S) events collected with the BES-II detector, the C-parity violating process J/psi->gamma gamma via psi(2S)->pi+pi- J/psi is studied. We determine a new upper limit for the J/psi->gamma gamma branching ratio of B(J/psi->gamma gamma)<2.2\times 10^{-5} at the 90% C.L., which is about 20 times lower than the previous measurement.

[{'version': 'v1', 'created': 'Fri, 21 Sep 2007 08:52:36 GMT'}]

2008-11-26

[array(['Ablikim', 'M.', ''], dtype=object) array(['Bai', 'J. Z.', ''], dtype=object)]

1910.13669

Forrest Francis

Forrest J. Francis

An Investigation Into Several Explicit Versions of Burgess' Bound

14 pages, version 2

math.NT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Let $\chi$ be a Dirichlet character modulo $p$, a prime. In applications, one often needs estimates for short sums involving $\chi$. One such estimate is the family of bounds known as \emph{Burgess' bound}. In this paper, we explore several minor adjustments one can make to the work of Enrique Trevi\~no on explicit versions of Burgess' bound. For an application, we investigate the problem of the existence of a $k$th power non-residue modulo $p$ which is less than $p^\alpha$ for several fixed $\alpha$. We also provide a quick improvement to the conductor bounds for norm-Euclidean cyclic fields.

[{'version': 'v1', 'created': 'Wed, 30 Oct 2019 04:54:05 GMT'} {'version': 'v2', 'created': 'Sun, 1 Dec 2019 23:00:15 GMT'}]

2019-12-03

[array(['Francis', 'Forrest J.', ''], dtype=object)]

math-ph/0211042

Eric M. Rains

Peter J. Forrester, Eric M. Rains

Interpretations of some parameter dependent generalizations of classical matrix ensembles

49 pages, 3 figures, LaTeX

math-ph math.MP

Two types of parameter dependent generalizations of classical matrix ensembles are defined by their probability density functions (PDFs). As the parameter is varied, one interpolates between the eigenvalue PDF for the superposition of two classical ensembles with orthogonal symmetry and the eigenvalue PDF for a single classical ensemble with unitary symmetry, while the other interpolates between a classical ensemble with orthogonal symmetry and a classical ensemble with symplectic symmetry. We give interpretations of these PDFs in terms of probabilities associated to the continuous Robinson-Schensted-Knuth correspondence between matrices, with entries chosen from certain exponential distributions, and non-intersecting lattice paths, and in the course of this probability measures on partitions and pairs of partitions are identified. The latter are generalized by using Macdonald polynomial theory, and a particular continuum limit -- the Jacobi limit -- of the resulting measures is shown to give PDFs related to those appearing in the work of Anderson on the Selberg integral. By interpreting Anderson's work as giving the PDF for the zeros of a certain rational function, it is then possible to identify random matrices whose eigenvalue PDFs realize the original parameter dependent PDFs. This line of theory allows sampling of the original parameter dependent PDFs, their Anderson-type generalizations and associated marginal distributions, from the zeros of certain polynomials defined in terms of random three term recurrences.

[{'version': 'v1', 'created': 'Tue, 19 Nov 2002 00:26:46 GMT'}]

2007-05-23

[array(['Forrester', 'Peter J.', ''], dtype=object) array(['Rains', 'Eric M.', ''], dtype=object)]

0904.0661

Jungyeon Cho

Jungyeon Cho, A. Lazarian

Simulations of Electron Magnetohydrodynamic Turbulence

ApJ, accepted; 19 pages, 14 figures (corrections + new calculations added)

Astrophys.J.701:236-252,2009

10.1088/0004-637X/701/1/236

astro-ph.EP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present numerical simulations of electron magnetohydrodynamic (EMHD) and electron reduced MHD (ERMHD) turbulence. Comparing scaling relations, we find that both EMHD and ERMHD turbulence show similar spectra and anisotropy. We develop new techniques to study anisotropy of EMHD turbulence. Our detailed study of anisotropy of EMHD turbulence supports our earlier result of k_par ~ k_perp^(1/3) scaling. We find that the high-order statistics show a scaling that is similar to the She-Leveque scaling. We observe that the bispectra, which characterize the interaction of different scales within the turbulence cascade, are very different for EMHD and MHD turbulence. We show that both decaying and driven EMHD turbulence have the same statistical properties. We calculate the probability distribution functions (PDFs) of MHD and EMHD turbulence and compare them with those of interplanetary turbulence. We find that, as in the case of the solar wind, the PDFs of the increments of magnetic field strength in MHD and EMHD turbulence are well described by the Tsallis distribution. We discuss implications of our results for astrophysical situations, including the ADAFs and magnetic reconnection.

[{'version': 'v1', 'created': 'Fri, 3 Apr 2009 22:16:00 GMT'} {'version': 'v2', 'created': 'Tue, 16 Jun 2009 18:09:25 GMT'}]

2009-07-24

[array(['Cho', 'Jungyeon', ''], dtype=object) array(['Lazarian', 'A.', ''], dtype=object)]

0705.1905

Koji Nagata

Koji Nagata

Multipartite omnidirectional generalized Bell inequality

4 pages

J. Phys. A: Math. Theor. 40 (2007) 13101-13106.

10.1088/1751-8113/40/43/017

quant-ph

We derive a multipartite generalized Bell inequality which involves the entire range of settings for each of the local observers. Especially, it is applied to show non-local behavior of a six-qubit mixture of Greenberger-Horne-Zeilinger correlations stronger than previous Bell inequalities. For certain noise admixture to the correlations an explicit local realistic model exists in the case of a standard Bell experiment. Bell experiments with many local settings reveal the non-locality of the state. It turns out that the new inequality is more stringent than many other Bell inequalities in the specific quantum state.

[{'version': 'v1', 'created': 'Mon, 14 May 2007 10:48:43 GMT'} {'version': 'v2', 'created': 'Mon, 10 Sep 2007 06:02:15 GMT'}]

2009-11-13

[array(['Nagata', 'Koji', ''], dtype=object)]

1805.11178

Alexander Binder

Alexander Binder, Michael Bockmayr, Miriam H\"agele, Stephan Wienert, Daniel Heim, Katharina Hellweg, Albrecht Stenzinger, Laura Parlow, Jan Budczies, Benjamin Goeppert, Denise Treue, Manato Kotani, Masaru Ishii, Manfred Dietel, Andreas Hocke, Carsten Denkert, Klaus-Robert M\"uller, Frederick Klauschen

Towards computational fluorescence microscopy: Machine learning-based integrated prediction of morphological and molecular tumor profiles

cs.CV

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Recent advances in cancer research largely rely on new developments in microscopic or molecular profiling techniques offering high level of detail with respect to either spatial or molecular features, but usually not both. Here, we present a novel machine learning-based computational approach that allows for the identification of morphological tissue features and the prediction of molecular properties from breast cancer imaging data. This integration of microanatomic information of tumors with complex molecular profiling data, including protein or gene expression, copy number variation, gene methylation and somatic mutations, provides a novel means to computationally score molecular markers with respect to their relevance to cancer and their spatial associations within the tumor microenvironment.

[{'version': 'v1', 'created': 'Mon, 28 May 2018 21:16:30 GMT'}]

2018-05-30

[array(['Binder', 'Alexander', ''], dtype=object) array(['Bockmayr', 'Michael', ''], dtype=object) array(['Hägele', 'Miriam', ''], dtype=object) array(['Wienert', 'Stephan', ''], dtype=object) array(['Heim', 'Daniel', ''], dtype=object) array(['Hellweg', 'Katharina', ''], dtype=object) array(['Stenzinger', 'Albrecht', ''], dtype=object) array(['Parlow', 'Laura', ''], dtype=object) array(['Budczies', 'Jan', ''], dtype=object) array(['Goeppert', 'Benjamin', ''], dtype=object) array(['Treue', 'Denise', ''], dtype=object) array(['Kotani', 'Manato', ''], dtype=object) array(['Ishii', 'Masaru', ''], dtype=object) array(['Dietel', 'Manfred', ''], dtype=object) array(['Hocke', 'Andreas', ''], dtype=object) array(['Denkert', 'Carsten', ''], dtype=object) array(['Müller', 'Klaus-Robert', ''], dtype=object) array(['Klauschen', 'Frederick', ''], dtype=object)]

astro-ph/0510418

Eric Aristidi

Abdelkrim Agabi (LUAN), Eric Aristidi (LUAN), Max Azouit (LUAN), Eric Fossat (LUAN), Francois Martin (LUAN), Tatiana Sadibekova (LUAN), Jean Vernin (LUAN), Aziz Ziad (LUAN)

First whole atmosphere night-time seeing measurements at Dome C, Antarctica

accepted for publication in PASP (oct 2005)

Publ.Astron.Soc.Pac.118:344-348,2006

10.1086/498728

astro-ph

We report site testing results obtained in night-time during the polar autumn and winter at Dome C. These results were collected during the first Concordia winterover by A. Agabi. They are based upon seeing and isoplanatic angle monitoring, as well as in-situ balloon measurements 2 of the refractive index structure constant profiles Cn (h). Atmosphere is divided into two regions: (i) a 36 m high surface layer responsible of 87% of the turbulence and (ii) a very stable free atmosphere above with a median seeing of 0.36+-0.19 arcsec at an elevation of h = 30 m. The median seeing measured with a DIMM placed on top of a 8.5 m high tower is 1.3+-0.8 arcsec.

[{'version': 'v1', 'created': 'Fri, 14 Oct 2005 07:05:17 GMT'}]

2009-11-13

[array(['Agabi', 'Abdelkrim', '', 'LUAN'], dtype=object) array(['Aristidi', 'Eric', '', 'LUAN'], dtype=object) array(['Azouit', 'Max', '', 'LUAN'], dtype=object) array(['Fossat', 'Eric', '', 'LUAN'], dtype=object) array(['Martin', 'Francois', '', 'LUAN'], dtype=object) array(['Sadibekova', 'Tatiana', '', 'LUAN'], dtype=object) array(['Vernin', 'Jean', '', 'LUAN'], dtype=object) array(['Ziad', 'Aziz', '', 'LUAN'], dtype=object)]

1903.05311

Shaoru Chen

Ximing Chen, Shaoru Chen, Victor M. Preciado

Safety Verification of Nonlinear Autonomous System via Occupation Measures

Update proofs

math.OC

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, we introduce a flexible notion of safety verification for nonlinear autonomous systems by measuring how much time the system spends in given unsafe regions. We consider this problem in the particular case of nonlinear systems with a polynomial dynamics and unsafe regions described by a collection of polynomial inequalities. In this context, we can quantify the amount of time spent in the unsafe regions as the solution to an infinite-dimensional linear program (LP). This LP measures the volume of the unsafe region with respect to the occupation measure of the system trajectories. Using Lasserre hierarchy, we approximate the solution to the infinite-dimensional LP using a sequence of finite-dimensional semidefinite programs (SDPs). The solutions to the SDPs in this hierarchy provide monotonically converging upper bounds on the optimal solution to the infinite-dimensional LP. Finally, we validate the performance of our framework using numerical simulations.

[{'version': 'v1', 'created': 'Wed, 13 Mar 2019 04:49:49 GMT'} {'version': 'v2', 'created': 'Thu, 11 Apr 2019 17:11:39 GMT'}]

2019-04-12

[array(['Chen', 'Ximing', ''], dtype=object) array(['Chen', 'Shaoru', ''], dtype=object) array(['Preciado', 'Victor M.', ''], dtype=object)]

0811.3770

Denis Burgarella

Denis Burgarella, Veronique Buat, Tsutomu T. Takeuchi, Takehiko Wada and Chris Pearson

Deep 15um AKARI observations in the CDFS: estimating dust luminosities for a MIR-selected sample and for Lyman Break Galaxies and the evolution of L(dust)/L(UV) with the redshift

Paper accepted for publication in PASJ

10.1093/pasj/61.2.177

astro-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Deep observations of the CDFS have been secured at 15um with AKARI/IRC infrared space telescope (ESA open time). From these observations, we define a sample of MIR-selected galaxies at 15um and we also obtain 15um flux densities for a sample of LBGs at z=1 already observed at 24um with Spitzer/MIPS. Number counts for the MIR-selected sample show a bump around a 15um flux density of 0.2mJy that can be attributed to galaxies at z>0.4 and at z>0.8 for the fainter part of the bump. This bump seems to be shifted as compared to other works and a possible origin can be the Cosmic variance. Thanks to this dataset, we have tested, on the two above samples at z=1, the validity of the conversions from monochromatic luminosities nu.f(nu) at a rest-frame wavelength of 8um by a comparison with total dust luminosities estimated from Spitzer rest-frame 12um data that we use as a reference. We find that the 8um dust luminosities are not all consistent and that some of them are better when compared to L(dust) evaluated from longer wavelength luminosities. We also find that the rest-frame 8um luminosities provide globally good estimates of L(dust). By comparing our data for the two samples to several libraries of SEDs, we find that models can explain the diversity of the observed f(24)/f(15) ratio quite reasonably for the MIR-selected sample and better for the LBG sample which are less dispersed than the MIR selection. However, when we analyse the luminosity dependence of this ratio, we find important discrepancies. Finally, we revisit the evolution of L(dust)/L(UV) ratio with the redshift z by re-calibrating previous L(dust) at z=2 based on our results and added new data points at higher redshifts. The decreasing trend is amplified as compared to the previous estimate.

[{'version': 'v1', 'created': 'Sun, 23 Nov 2008 20:48:49 GMT'}]

2015-05-13

[array(['Burgarella', 'Denis', ''], dtype=object) array(['Buat', 'Veronique', ''], dtype=object) array(['Takeuchi', 'Tsutomu T.', ''], dtype=object) array(['Wada', 'Takehiko', ''], dtype=object) array(['Pearson', 'Chris', ''], dtype=object)]

0905.4582

Peter Grassl

Jan Novak, Chris J. Pearce, Peter Grassl, Liu Yang, James Thomason

Analysis of the microbond test using nonlinear fracture mechanics

Submitted to 17th international conference on composite materials (ICCM-17)

cond-mat.mtrl-sci

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Microbond tests composed of single fibre and matrix droplet are often used to determine the properties of fibre reinforced composites. Interfacial shear strength is quantified by the maximum pull-out force assuming a uniform stress distribution along the fibre. Here, nonlinear finite element analyses are performed to investigate the validity of this assumption.

[{'version': 'v1', 'created': 'Thu, 28 May 2009 09:08:28 GMT'}]

2009-05-29

[array(['Novak', 'Jan', ''], dtype=object) array(['Pearce', 'Chris J.', ''], dtype=object) array(['Grassl', 'Peter', ''], dtype=object) array(['Yang', 'Liu', ''], dtype=object) array(['Thomason', 'James', ''], dtype=object)]

1611.06602

Jovan Milosevic

P. Cirkovic and D. Devetak and M. Dordevic and J. Milosevic and M. Stojanovic

Sub-leading flow modes in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV from HYDJET++ model

10 pages, 7 figures

Chinese Physics C Vol. 41, No. 7 (2017) 074001

10.1088/1674-1137/41/7/074001

nucl-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Recent LHC results on the appearance of sub-leading flow modes in PbPb collisions at 2.76~TeV, related to initial-state fluctuations, are analyzed and interpreted within the HYDJET++ model. Using the newly introduced Principal Component Analysis (PCA) method applied to two-particle azimuthal correlations extracted from the model calculations, the leading and the sub-leading flow modes are studied as a function of the transverse momentum ($p_{T}$) over a wide centrality range. The leading modes of the elliptic ($v^{(1)}_{2}$) and triangular ($v^{(1)}_{3}$) flow calculated within the HYDJET++ model reproduce rather well the $v_{2}\{2\}$ and $v_{3}\{2\}$ coefficients experimentally measured using the two-particle correlations. Within the $p_{T} \le $~3~GeV/c range where hydrodynamics dominates, the sub-leading flow effects are greatest at the highest $p_{T}$ of around 3~GeV/c. The sub-leading elliptic flow mode ($v^{(2)}_{2}$), which corresponds to $n = 2$ harmonic, has a small non-zero value and slowly increases from central to peripheral collisions, while the sub-leading triangular flow mode ($v^{(2)}_{3}$), which corresponds to $n = 3$ harmonic, is even smaller and does not depend on centrality. For $n = $~2, the relative magnitude of the effect measured with respect to the leading flow mode shows a shallow minimum for semi-central collisions and increases for very central and for peripheral collisions. For $n = $~3 case, there is no centrality dependence. The sub-leading flow mode results obtained from the HYDJET++ model are in a rather good agreement with the experimental measurements of the CMS Collaboration.

[{'version': 'v1', 'created': 'Sun, 20 Nov 2016 22:16:37 GMT'} {'version': 'v2', 'created': 'Wed, 1 Feb 2017 13:22:21 GMT'} {'version': 'v3', 'created': 'Fri, 31 Mar 2017 20:53:22 GMT'}]

2017-04-24

[array(['Cirkovic', 'P.', ''], dtype=object) array(['Devetak', 'D.', ''], dtype=object) array(['Dordevic', 'M.', ''], dtype=object) array(['Milosevic', 'J.', ''], dtype=object) array(['Stojanovic', 'M.', ''], dtype=object)]

cond-mat/0210526

Nicolai Nygaard

N. Nygaard, G. M. Bruun, C. W. Clark and D. L. Feder

Microscopic Structure of a Vortex Line in a Superfluid Fermi Gas

4 pages, 4 embedded figures. Added references. To be published in Physical Review Letters

Phys. Rev. Lett. 90, 210402 (2003)

10.1103/PhysRevLett.90.210402

cond-mat.soft cond-mat.mes-hall cond-mat.supr-con

The microscopic properties of a single vortex in a dilute superfluid Fermi gas at zero temperature are examined within the framework of self-consistent Bogoliubov-de Gennes theory. Using only physical parameters as input, we study the pair potential, the density, the energy, and the current distribution. Comparison of the numerical results with analytical expressions clearly indicates that the energy of the vortex is governed by the zero-temperature BCS coherence length.

[{'version': 'v1', 'created': 'Wed, 23 Oct 2002 17:49:18 GMT'} {'version': 'v2', 'created': 'Wed, 16 Apr 2003 17:03:26 GMT'}]

2007-05-23

[array(['Nygaard', 'N.', ''], dtype=object) array(['Bruun', 'G. M.', ''], dtype=object) array(['Clark', 'C. W.', ''], dtype=object) array(['Feder', 'D. L.', ''], dtype=object)]

1906.09907

Sibylle Hess

Sibylle Hess and Katharina Morik

C-SALT: Mining Class-Specific ALTerations in Boolean Matrix Factorization

Joint European Conference on Machine Learning and Knowledge Discovery in Databases. Springer, Cham, 2017

cs.LG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Given labeled data represented by a binary matrix, we consider the task to derive a Boolean matrix factorization which identifies commonalities and specifications among the classes. While existing works focus on rank-one factorizations which are either specific or common to the classes, we derive class-specific alterations from common factorizations as well. Therewith, we broaden the applicability of our new method to datasets whose class-dependencies have a more complex structure. On the basis of synthetic and real-world datasets, we show on the one hand that our method is able to filter structure which corresponds to our model assumption, and on the other hand that our model assumption is justified in real-world application. Our method is parameter-free.

[{'version': 'v1', 'created': 'Mon, 17 Jun 2019 22:38:00 GMT'}]

2019-06-25

[array(['Hess', 'Sibylle', ''], dtype=object) array(['Morik', 'Katharina', ''], dtype=object)]

math/0209002

Martino Prizzi

M. Prizzi and K.P. Rybakowski

Inertial manifolds on squeezed domains

39 pages, 3 figures. To appear in "Jour. Dynam. Differerential Equations"

math.AP math.DS

Let $\Omega$ be an arbitrary smooth bounded domain in $\R^2$ and $\epsilon>0$ be arbitrary. Squeeze $\Omega$ by the factor $\epsilon$ in the $y$-direction to obtain the squeezed domain $\Omega_\epsilon=\{(x,\epsilon y)\mid (x,y)\in\Omega \}$. In this paper we study the family of reaction-diffusion equations $$ \alignedat 2 u_t&=\Delta u+f(u),&\quad &t>0, (x,y)\in\Omega_\epsilon \partial_{\nu_\epsilon} u&=0,& & t>0, (x,y)\in\partial\Omega_\epsilon,\endalignedat\tag $E_\epsilon$ $$ where $f$ is a dissipative nonlinearity of polynomial growth. In a previous paper we showed that, as $\epsilon\to 0$, the equations $(E_\epsilon)$ have a limiting equation which is an abstract semilinear parabolic equation defined on a closed linear subspace of $H^1(\Omega)$. We also proved that the family ${\Cal A}_\epsilon$ of the corresponding attractors is upper semicontinuous at $\epsilon=0$. In this paper we prove that, if $\Omega$ satisfies some natural assumptions, then the limiting equation can be characterized as a reaction-diffusion equation on a finite topological graph. Moreover, there is a family $\Cal M_\epsilon$ of inertial $C^1$-manifolds for $(E_\epsilon)$, of some fixed finite dimension $\nu$, and, as $\epsilon\to 0$, the flow on $\Cal M_\epsilon$ converges in the $C^1$-sense to the limit flow on $\Cal M_0$.

[{'version': 'v1', 'created': 'Sat, 31 Aug 2002 09:45:58 GMT'}]

2007-05-23

[array(['Prizzi', 'M.', ''], dtype=object) array(['Rybakowski', 'K. P.', ''], dtype=object)]

2008.12508

Tony A. Wood

Mitchell Khoo, Tony A. Wood, Chris Manzie, Iman Shames

A Greedy and Distributable Approach to the Lexicographic Bottleneck Assignment Problem with Conditions on Exactness

math.OC

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Solving the Lexicographic Bottleneck Assignment Problem (LexBAP) typically relies on centralised computation with order quartic complexity. We consider the Sequential Bottleneck Assignment Problem (SeqBAP), which yields a greedy solution to the LexBAP and discuss the relationship between the SeqBAP, the LexBAP, and the Bottleneck Assignment Problem (BAP). In particular, we reexamine tools used to analyse the structure of the BAP, and apply them to derive an algorithm that solves the SeqBAP with cubic complexity. We show that the set of solutions of the LexBAP is a subset of the solutions of the SeqBAP and analyse the conditions for which the solutions sets are identical. Furthermore, we provide a method to verify the satisfaction of these conditions. In cases where the conditions are satisfied, the proposed algorithm for solving the SeqBAP solves the LexBAP with computation that has lower complexity and can be distributed over a network of computing agents. The applicability of the approach is demonstrated with a case study where mobile robots are assigned to goal locations.

[{'version': 'v1', 'created': 'Fri, 28 Aug 2020 07:05:55 GMT'} {'version': 'v2', 'created': 'Fri, 7 Jan 2022 20:17:47 GMT'}]

2022-01-11

[array(['Khoo', 'Mitchell', ''], dtype=object) array(['Wood', 'Tony A.', ''], dtype=object) array(['Manzie', 'Chris', ''], dtype=object) array(['Shames', 'Iman', ''], dtype=object)]

2107.13910

Jianfang Lin

Jianfang Lin, Yan Yu, Huiwen Xue and Xinghui Zhong

High order finite difference WENO methods with unequal-sized sub-stencils for the Degasperis-Procesi type equations

10.4208/cicp.OA-2021-0158

math.NA cs.NA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, we develop two finite difference weighted essentially non-oscillatory (WENO) schemes with unequal-sized sub-stencils for solving the Degasperis-Procesi (DP) and $\mu$-Degasperis-Procesi ($\mu$DP) equations, which contain nonlinear high order derivatives, and possibly peakon solutions or shock waves. By introducing auxiliary variable(s), we rewrite the DP equation as a hyperbolic-elliptic system, and the \mdp equation as a first order system. Then we choose a linear finite difference scheme with suitable order of accuracy for the auxiliary variable(s), and two finite difference WENO schemes with unequal-sized sub-stencils for the primal variable. One WENO scheme uses one large stencil and several smaller stencils, and the other WENO scheme is based on the multi-resolution framework which uses a series of unequal-sized hierarchical central stencils. Comparing with the classical WENO scheme which uses several small stencils of the same size to make up a big stencil, both WENO schemes with unequal-sized sub-stencils are simple in the choice of the stencil and enjoy the freedom of arbitrary positive linear weights. Another advantage is that the final reconstructed polynomial on the target cell is a polynomial of the same degree as the polynomial over the big stencil, while the classical finite difference WENO reconstruction can only be obtained for specific points inside the target interval. Numerical tests are provided to demonstrate the high order accuracy and non-oscillatory properties of the proposed schemes.

[{'version': 'v1', 'created': 'Thu, 29 Jul 2021 11:40:37 GMT'} {'version': 'v2', 'created': 'Wed, 22 Dec 2021 06:12:03 GMT'}]

2022-03-14

[array(['Lin', 'Jianfang', ''], dtype=object) array(['Yu', 'Yan', ''], dtype=object) array(['Xue', 'Huiwen', ''], dtype=object) array(['Zhong', 'Xinghui', ''], dtype=object)]

1801.08731

\'Elie Goudout

\'Elie Goudout

Highest perfect power of a product of integers less than $x$

1 page, accepted for publication in the IJNT

Int. J. Number Theory, 14(7)(2018):2043-2044

10.1142/S1793042118501233

math.NT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

For $x\geq 3$, we define $w(x)$ as the highest integer $w$ for which there exist integers $m, y\geq 1$ and $1\leq n_1<\dots<n_m\leq x$ such that $n_1\cdots n_m=y^w$. We show that \[w(x)=x\exp\big(-(\sqrt{2}+o(1))\sqrt{\log x\log\log x}\big).\]

[{'version': 'v1', 'created': 'Fri, 26 Jan 2018 09:40:24 GMT'}]

2022-09-27

[array(['Goudout', 'Élie', ''], dtype=object)]

1812.08156

Alex Zihao Zhu

Alex Zihao Zhu, Liangzhe Yuan, Kenneth Chaney, Kostas Daniilidis

Unsupervised Event-based Learning of Optical Flow, Depth, and Egomotion

9 pages, 7 figures

cs.CV

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this work, we propose a novel framework for unsupervised learning for event cameras that learns motion information from only the event stream. In particular, we propose an input representation of the events in the form of a discretized volume that maintains the temporal distribution of the events, which we pass through a neural network to predict the motion of the events. This motion is used to attempt to remove any motion blur in the event image. We then propose a loss function applied to the motion compensated event image that measures the motion blur in this image. We train two networks with this framework, one to predict optical flow, and one to predict egomotion and depths, and evaluate these networks on the Multi Vehicle Stereo Event Camera dataset, along with qualitative results from a variety of different scenes.

[{'version': 'v1', 'created': 'Wed, 19 Dec 2018 18:50:54 GMT'}]

2018-12-20

[array(['Zhu', 'Alex Zihao', ''], dtype=object) array(['Yuan', 'Liangzhe', ''], dtype=object) array(['Chaney', 'Kenneth', ''], dtype=object) array(['Daniilidis', 'Kostas', ''], dtype=object)]

2103.00456

Gaoqing Cao

Gaoqing Cao

Recent progresses on QCD phases in a strong magnetic field -- views from Nambu--Jona-Lasinio model

10.1140/epja/s10050-021-00570-0

hep-ph nucl-th

http://creativecommons.org/licenses/by-nc-sa/4.0/

In this review, we summarize recent progress on the possible phases of quantum chromodynamics (QCD) in the presence of a strong magnetic field, mainly from the views of the chiral effective Nambu--Jona-Lasinio model. Four kinds of phase transitions are explored in detail: chiral symmetry breaking and restoration, neutral pseudoscalar superfluidity, charged pion superfluidity and charged rho superconductivity. In particular, we revisit the unsolved problems of inverse magnetic catalysis effect and competition between the chiral density wave and solitonic modulation phases. It is shown that useful results can be obtained by adopting self-consistent schemes.

[{'version': 'v1', 'created': 'Sun, 28 Feb 2021 11:11:04 GMT'} {'version': 'v2', 'created': 'Sun, 11 Jul 2021 02:45:47 GMT'} {'version': 'v3', 'created': 'Tue, 17 Aug 2021 02:16:23 GMT'}]

2023-02-22

[array(['Cao', 'Gaoqing', ''], dtype=object)]

2209.01381

Nasrin Shirali

Sayed Malek Javdannezhad, Mohammad Maschizadeh and Nasrin Shirali

On AB5* modules with Noetherian dimension

math.RA

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, we study the Noetherian dimension of sum of certain modules. It is proved that for any module M which is an irredundant sum of submodules, each of which has Noetherian dimension less than alpha, if M has finite spanning dimension (fsd-module, for short) or it is a weakly atomic module, then Noetherian dimension M less than alpha. Here, by a weakly atomic module we mean a module M for which every proper non-small submodule N, has Noetherian dimension strictly less than that of M. Also, it is proved that if M is an AB5* module with Noetherian dimension and N_i is a family of submodules of M such that Noetherian dimension M over N_i, less than alpha, for each i, then Noetherian dimension M over intersection of N_is less than alpha. Using this, we give a structure theorem for alpha-short modules in the category of AB5* and finally, we classify alpha-short modules in this category.

[{'version': 'v1', 'created': 'Sat, 3 Sep 2022 09:27:59 GMT'} {'version': 'v2', 'created': 'Fri, 23 Jun 2023 17:11:13 GMT'}]

2023-06-26

[array(['Javdannezhad', 'Sayed Malek', ''], dtype=object) array(['Maschizadeh', 'Mohammad', ''], dtype=object) array(['Shirali', 'Nasrin', ''], dtype=object)]

1809.00572

Leigh Fletcher

L.N. Fletcher, G.S. Orton, J.A. Sinclair, S. Guerlet, P.L. Read, A. Antunano, R.K. Achterberg, F.M. Flasar, P.G.J. Irwin, G.L. Bjoraker, J. Hurley, B.E. Hesman, M. Segura, N. Gorius, A. Mamoutkine, S.B. Calcutt

A Hexagon in Saturn's Northern Stratosphere Surrounding the Emerging Summertime Polar Vortex

51 pages, 12 figures, published in Nature Communications

Nature Communications, Volume 9, Article number: 3564 (2018)

10.1038/s41467-018-06017-3

astro-ph.EP

http://creativecommons.org/licenses/by/4.0/

Saturn's polar stratosphere exhibits the seasonal growth and dissipation of broad, warm, vortices poleward of $\sim75^\circ$ latitude, which are strongest in the summer and absent in winter. The longevity of the exploration of the Saturn system by Cassini allows the use of infrared spectroscopy to trace the formation of the North Polar Stratospheric Vortex (NPSV), a region of enhanced temperatures and elevated hydrocarbon abundances at millibar pressures. We constrain the timescales of stratospheric vortex formation and dissipation in both hemispheres. Although the NPSV formed during late northern spring, by the end of Cassini's reconnaissance (shortly after northern summer solstice), it still did not display the contrasts in temperature and composition that were evident at the south pole during southern summer. The newly-formed NPSV was bounded by a strengthening stratospheric thermal gradient near $78^\circ$N. The emergent boundary was hexagonal, suggesting that the Rossby wave responsible for Saturn's long-lived polar hexagon - which was previously expected to be trapped in the troposphere - can influence the stratospheric temperatures some 300 km above Saturn's clouds.

[{'version': 'v1', 'created': 'Mon, 3 Sep 2018 12:13:36 GMT'}]

2018-09-05

[array(['Fletcher', 'L. N.', ''], dtype=object) array(['Orton', 'G. S.', ''], dtype=object) array(['Sinclair', 'J. A.', ''], dtype=object) array(['Guerlet', 'S.', ''], dtype=object) array(['Read', 'P. L.', ''], dtype=object) array(['Antunano', 'A.', ''], dtype=object) array(['Achterberg', 'R. K.', ''], dtype=object) array(['Flasar', 'F. M.', ''], dtype=object) array(['Irwin', 'P. G. J.', ''], dtype=object) array(['Bjoraker', 'G. L.', ''], dtype=object) array(['Hurley', 'J.', ''], dtype=object) array(['Hesman', 'B. E.', ''], dtype=object) array(['Segura', 'M.', ''], dtype=object) array(['Gorius', 'N.', ''], dtype=object) array(['Mamoutkine', 'A.', ''], dtype=object) array(['Calcutt', 'S. B.', ''], dtype=object)]

nucl-th/0110056

Arturo De Pace

A. De Pace and A. Molinari (INFN and Dipartimento di Fisica Teorica, Torino, Italy)

Statistical theory of the many-body nuclear system

27 pages, 3 figures; Dedicated to the memory of Herman Feshbach

Annals Phys. 296 (2002) 263-286

10.1006/aphy.2001.6205

nucl-th

A recently proposed statistical theory of the mean fields associated with the ground and excited collective states of a generic many-body system is extended by increasing the dimensions of the P-space. In applying the new framework to nuclear matter, in addition to the mean field energies we obtain their fluctuations as well, together with the ones of the wavefunctions, in first order of the expansion in the complexity of the Q-space states. The physics described by the latter is assumed to be random. To extract numerical predictions out of our scheme we develop a schematic version of the approach, which, while much simplified, yields results of significance on the size of the error affecting the mean fields, on the magnitude of the residual effective interaction, on the ground state spectroscopic factor and on the mixing occurring between the vectors spanning the P-space.

[{'version': 'v1', 'created': 'Tue, 23 Oct 2001 14:07:40 GMT'}]

2009-11-07

[array(['De Pace', 'A.', '', 'INFN and Dipartimento di Fisica Teorica,\n Torino, Italy'], dtype=object) array(['Molinari', 'A.', '', 'INFN and Dipartimento di Fisica Teorica,\n Torino, Italy'], dtype=object) ]

1107.4584

Guray Erkol

Guray Erkol and Altug Ozpineci

Tensor form factors of nucleon in QCD

8 pages, 1 figure; minor changes, matches journal version

Phys. Lett. B 704 (2011) 551

10.1016/j.physletb.2011.09.089

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We extract the isovector tensor nucleon form factors, which play an important role in understanding the transverse spin structure of the nucleon when related to the quark helicity-flip generalized parton distributions via their first moments. We employ the light-cone QCD sum rules to leading order in QCD and include distribution amplitudes up to twist 6 in order to calculate the three tensor form factors $H_T$, $E_T$ and $\tilde{H}_T$. Our results agree well with those from other approaches in the low and high momentum-transfer regions.

[{'version': 'v1', 'created': 'Fri, 22 Jul 2011 17:39:39 GMT'} {'version': 'v2', 'created': 'Fri, 7 Oct 2011 12:07:29 GMT'}]

2011-10-10

[array(['Erkol', 'Guray', ''], dtype=object) array(['Ozpineci', 'Altug', ''], dtype=object)]

0903.2989

Karsten Held

Y.-F. Yang and K. Held

Dynamical mean field theory for manganites

11 pages, 18 figures In the 2nd version the only change is to correct one (important) reference

10.1103/PhysRevB.82.195109

cond-mat.str-el cond-mat.mtrl-sci

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Doped and undoped manganites are modeled by the coupling between itinerant $e_g$ electrons and static $t_{2g}$ spins, the Jahn-Teller and breathing phonon modes, and the Coulomb interaction. We provide for a careful estimate of all parameters and solve the corresponding Hamiltonian by dynamical mean field theory. Our results for the one-electron spectrum, the optical conductivity, the dynamic and static lattice distortion, as well as the Curie temperature show the importance of all of the above ingredients for a realistic calculation as well as for describing the unusual dynamical properties of manganites including the insulating parent compound and the insulating-like paramagnetic state of doped manganites.

[{'version': 'v1', 'created': 'Tue, 17 Mar 2009 16:05:21 GMT'} {'version': 'v2', 'created': 'Fri, 20 Mar 2009 07:52:20 GMT'}]

2013-05-29

[array(['Yang', 'Y. -F.', ''], dtype=object) array(['Held', 'K.', ''], dtype=object)]

nucl-th/0507066

Kazunari Kaneko

K. Kaneko and M. Hasegawa

Quenching of pairing gap at finite temperature in 184W

5 pages, 4 figures, accepted for publication in PRC

Phys.Rev. C72 (2005) 024307

10.1103/PhysRevC.72.024307

nucl-th

We extract pairing gap in $^{184}$W at finite temperature for the first time from the experimental level densities of $^{183}$W, $^{184}$W, and $^{185}$W using "thermal" odd-even mass difference. We found the quenching of pairing gap near the critical temperature $T_c = 0.47$ MeV in the BCS calculations. It is shown that the monopole pairing model with a deformed Woods-Saxon potential explains the reduction of the pairing correlation using the partition function with the number parity projection in the static path approximation plus random-phase approximation.

[{'version': 'v1', 'created': 'Wed, 27 Jul 2005 02:43:26 GMT'}]

2009-11-11

[array(['Kaneko', 'K.', ''], dtype=object) array(['Hasegawa', 'M.', ''], dtype=object)]

cs/0610091

Pedro Miramontes

R. Mansilla, E. K\"oppen, G. Cocho and P. Miramontes

On the Behavior of Journal Impact Factor Rank-Order Distribution

Submitted to the Journal of Informetrics, redundat text cropped, bibliography corrected, new section added, typos corrected

cs.IR physics.soc-ph

An empirical law for the rank-order behavior of journal impact factors is found. Using an extensive data base on impact factors including journals on Education, Agrosciences, Geosciences, Biosciences and Environ- mental, Chemical, Computer, Engineering, Material, Mathematical, Medical and Physical Sciences we have found extremely good fits out- performing other rank-order models. Some extensions to other areas of knowledge are discussed.

[{'version': 'v1', 'created': 'Sat, 14 Oct 2006 17:03:46 GMT'} {'version': 'v2', 'created': 'Tue, 17 Oct 2006 14:10:01 GMT'} {'version': 'v3', 'created': 'Thu, 26 Oct 2006 17:54:29 GMT'} {'version': 'v4', 'created': 'Sun, 24 Dec 2006 06:03:44 GMT'}]

2007-05-23

[array(['Mansilla', 'R.', ''], dtype=object) array(['Köppen', 'E.', ''], dtype=object) array(['Cocho', 'G.', ''], dtype=object) array(['Miramontes', 'P.', ''], dtype=object)]

cs/0505051

Jaime Gomez

Jaime Gomez, Ignacio Melgar, Juan Seijas, Diego Andina

Sub-Optimum Signal Linear Detector Using Wavelets and Support Vector Machines

6 pages

WSEAS Transactions on Communications, ISSN 1109-2742, issue 4, vol 2, p426-431, October-2003

cs.IR cs.NE

The problem of known signal detection in Additive White Gaussian Noise is considered. In previous work, a new detection scheme was introduced by the authors, and it was demonstrated that optimum performance cannot be reached in a real implementation. In this paper we analyse Support Vector Machines (SVM) as an alternative, evaluating the results in terms of Probability of detection curves for a fixed Probability of false alarm.

[{'version': 'v1', 'created': 'Fri, 20 May 2005 14:54:40 GMT'}]

2007-05-23

[array(['Gomez', 'Jaime', ''], dtype=object) array(['Melgar', 'Ignacio', ''], dtype=object) array(['Seijas', 'Juan', ''], dtype=object) array(['Andina', 'Diego', ''], dtype=object)]

0910.1664

Paul Joyce

Erkan Ozge Buzbas, Paul Joyce

Maximum likelihood estimates under $\mathbf{k}$-allele models with selection can be numerically unstable

Published in at http://dx.doi.org/10.1214/09-AOAS237 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)

Annals of Applied Statistics 2009, Vol. 3, No. 3, 1147-1162

10.1214/09-AOAS237

IMS-AOAS-AOAS237

stat.AP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The stationary distribution of allele frequencies under a variety of Wright--Fisher $k$-allele models with selection and parent independent mutation is well studied. However, the statistical properties of maximum likelihood estimates of parameters under these models are not well understood. Under each of these models there is a point in data space which carries the strongest possible signal for selection, yet, at this point, the likelihood is unbounded. This result remains valid even if all of the mutation parameters are assumed to be known. Therefore, standard simulation approaches used to approximate the sampling distribution of the maximum likelihood estimate produce numerically unstable results in the presence of substantial selection. We describe the Bayesian alternative where the posterior distribution tends to produce more accurate and reliable interval estimates for the selection intensity at a locus.

[{'version': 'v1', 'created': 'Fri, 9 Oct 2009 07:17:26 GMT'}]

2009-10-12

[array(['Buzbas', 'Erkan Ozge', ''], dtype=object) array(['Joyce', 'Paul', ''], dtype=object)]

0902.2662

David Sanchez

Mircea Crisan, David Sanchez, Rosa Lopez, Llorens Serra, Ioan Grosu

Localized magnetic states in Rashba dots

8 pages, 4 figures; to appear in Phys. Rev. B

Phys. Rev. B 79, 125319 (2009)

10.1103/PhysRevB.79.125319

cond-mat.str-el

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the formation of local moments in quantum dots arising in quasi-one dimensional electron wires due to localized spin-orbit (Rashba) interaction. Using an Anderson-like model to describe the occurrence of the magnetic moments in these Rashba dots, we calculate the local magnetization within the mean-field approximation. We find that the magnetization becomes a nontrivial function of the Rashba coupling strength. We discuss both the equilibrium and nonequilibrium cases. Interestingly, we obtain a magnetic phase which is stable at large bias due to the Rashba interaction.

[{'version': 'v1', 'created': 'Mon, 16 Feb 2009 11:10:21 GMT'}]

2009-11-13

[array(['Crisan', 'Mircea', ''], dtype=object) array(['Sanchez', 'David', ''], dtype=object) array(['Lopez', 'Rosa', ''], dtype=object) array(['Serra', 'Llorens', ''], dtype=object) array(['Grosu', 'Ioan', ''], dtype=object)]

1103.0666

Xuekai Ma

Xuekai Ma, Zhenjun Yang, Daquan Lu, Wei Hu

Multiple-type solutions for multipole interface solitons in thermal nonlinear media

5 pages, 5 figures

Phys. Rev. A 84, 033802 (2011)

10.1103/PhysRevA.84.033802

physics.optics

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We address the existence of multipole interface solitons in one-dimensional thermal nonlinear media with a step in the linear refractive index at the sample center. It is found that there exist two types of solutions for tripole and quadrupole interface solitons. The two types of interface solitons have different profiles, beam widths, mass centers, and stability regions. For a given propagation constant, only one type of interface soliton is proved to be stable, while the other type can also survive over a long distance. In addition, three types of solutions for fifth-order interface solitons are found.

[{'version': 'v1', 'created': 'Thu, 3 Mar 2011 12:26:50 GMT'} {'version': 'v2', 'created': 'Mon, 5 Sep 2011 03:16:06 GMT'}]

2011-09-06

[array(['Ma', 'Xuekai', ''], dtype=object) array(['Yang', 'Zhenjun', ''], dtype=object) array(['Lu', 'Daquan', ''], dtype=object) array(['Hu', 'Wei', ''], dtype=object)]

0709.3873

John Davis

J. Davis, A.J. Booth, M.J. Ireland, A.P. Jacob, J.R. North, S.M. Owens, J.G. Robertson, W.J. Tango and P.G. Tuthill

The Emergent Flux and Effective Temperature of Delta Canis Majoris

8 pages, 4 figures

10.1071/AS07017

astro-ph

New angular diameter determinations for the bright southern F8 supergiant Delta CMa enable the bolometric emergent flux and effective temperature of the star to be determined with improved accuracy. The spectral flux distribution and bolometric flux have been determined from published photometry and spectrophotometry and combined with the angular diameter to derive the bolometric emergent flux F = (6.50 plus/minus 0.24) x 10^7 W/m^2 and the effective temperature Teff = 5818 plus/minus 53 K. The new value for the effective temperature is compared with previous interferometric and infrared flux method determinations. The accuracy of the effective temperature is now limited by the uncertainty in the bolometric flux rather than by the uncertainty in the angular diameter.

[{'version': 'v1', 'created': 'Tue, 25 Sep 2007 04:53:59 GMT'}]

2009-11-13

[array(['Davis', 'J.', ''], dtype=object) array(['Booth', 'A. J.', ''], dtype=object) array(['Ireland', 'M. J.', ''], dtype=object) array(['Jacob', 'A. P.', ''], dtype=object) array(['North', 'J. R.', ''], dtype=object) array(['Owens', 'S. M.', ''], dtype=object) array(['Robertson', 'J. G.', ''], dtype=object) array(['Tango', 'W. J.', ''], dtype=object) array(['Tuthill', 'P. G.', ''], dtype=object)]

1508.02228

Chandan Singh Dalawat

Chandan Singh Dalawat

The ramification filtration in certain $p$-extensions

5 pages, reorganised, filled in the details, and wrote a summary

math.NT

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We show that the recent result of Casta\~neda and Wu about the ramification filtration in certain $p$-extensions of function fields of prime characteristic $p$ is equally valid over local fields of mixed characteristic $(0,p)$. Apart from being applicable to both equicharacteristic and mixed characteristic cases, our method has the advantage of being purely local, purely conceptual, more natural, and much shorter.

[{'version': 'v1', 'created': 'Mon, 10 Aug 2015 13:01:10 GMT'} {'version': 'v2', 'created': 'Sun, 16 Aug 2015 07:01:10 GMT'}]

2015-08-18

[array(['Dalawat', 'Chandan Singh', ''], dtype=object)]

hep-ph/9611385

Jiri Chyla

J. Chyla, J. Cvach

Virtual Photon Structure from Jet Production at HERA

Contribution to the Workshop on "Future Physics at HERA", eds. G. Ingelman, A. De Roeck, R. Klanner,4 pages, 3 figures, epsfig

hep-ph

The feasibility of measuring parton distribution functions of of virtual photons via the jet production at HERA is investigated.

[{'version': 'v1', 'created': 'Thu, 21 Nov 1996 09:48:29 GMT'}]

2007-05-23

[array(['Chyla', 'J.', ''], dtype=object) array(['Cvach', 'J.', ''], dtype=object)]

hep-lat/9801013

Don Weingarten

W. Lee and D. Weingarten

The Scalar Quarkonium Spectrum and Quarkonium-Glueball Mixing

3 pages, 4 PostScript figures, talk given at Lattice 97

Nucl.Phys.Proc.Suppl. 63 (1998) 194-196

10.1016/S0920-5632(97)00719-6

IBM-HET-97-1

hep-lat

We evaluate the valence approximation to the mass of scalar quarkonium and to the mixing energy between scalar quarkonium and the lightest scalar glueball for a range of different lattice sizes and quark masses. Our results support the identification of $f_0(1710)$ as the lightest scalar glueball.

[{'version': 'v1', 'created': 'Wed, 14 Jan 1998 20:01:53 GMT'}]

2009-10-31

[array(['Lee', 'W.', ''], dtype=object) array(['Weingarten', 'D.', ''], dtype=object)]

cond-mat/9805249

Antonio Garcia-Martin

A. Garcia-Martin, J.A. Torres, J.J. Saenz and M. Nieto-Vesperinas

Intensity Distribution of Modes in Surface Corrugated Waveguides

Phys. Rev. Lett. 80, 4165 (1998)

10.1103/PhysRevLett.80.4165

cond-mat.dis-nn physics.optics

Exact calculations of transmission and reflection coefficients in surface randomly corrugated optical waveguides are presented. As the length of the corrugated part of the waveguide increases, there is a strong preference to forward coupling through the lowest mode. An oscillating behavior of the enhanced backscattering as a function of the wavelength is predicted. Although the transport is strongly non isotropic, the analysis of the probability distributions of the transmitted waves confirms in this configuration distributions predicted by Random Matrix Theory for volume disorder.

[{'version': 'v1', 'created': 'Wed, 20 May 1998 12:58:19 GMT'}]

2009-10-31

[array(['Garcia-Martin', 'A.', ''], dtype=object) array(['Torres', 'J. A.', ''], dtype=object) array(['Saenz', 'J. J.', ''], dtype=object) array(['Nieto-Vesperinas', 'M.', ''], dtype=object)]

1802.09115

Ram Seshadri

Joshua D. Bocarsly, Ryan F. Need, Ram Seshadri, and Stephen D. Wilson

Magnetoentropic signatures of skyrmionic phase behavior in FeGe

6 pages and 4 figures

Phys. Rev. B 97, 100404 (2018)

10.1103/PhysRevB.97.100404

cond-mat.mtrl-sci

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We demonstrate that magnetocaloric measurements can rapidly reveal details of the phase diagrams of high-temperature skyrmion hosts, concurrently yielding quantitative latent heats of the field-driven magnetic phase transitions. Our approach addresses an outstanding issue in the phase diagram of the skyrmion host FeGe by showing that dc magnetic anomalies can be explained in terms of entropic signatures consistent with a phase diagram containing a single pocket of skyrmionic order and a Brazovskii transition.

[{'version': 'v1', 'created': 'Mon, 26 Feb 2018 00:41:31 GMT'} {'version': 'v2', 'created': 'Tue, 3 Apr 2018 20:11:52 GMT'}]

2018-04-11

[array(['Bocarsly', 'Joshua D.', ''], dtype=object) array(['Need', 'Ryan F.', ''], dtype=object) array(['Seshadri', 'Ram', ''], dtype=object) array(['Wilson', 'Stephen D.', ''], dtype=object)]

2110.00819

Ali Fathi

Ali Fathi, Mohammad Rashid, Shayan Ranjbarzadeh, Mojtaba Tefagh

Multi-Feasibility Variable Selection

cs.DC math.OC q-bio.MN q-bio.QM

http://creativecommons.org/licenses/by-nc-sa/4.0/

This paper is the report of the problem proposed for the !Optimizer 2021 competition, and the solutions of the gold medalist team, i.e., the Panda team. The competition was held in two stages, the research and development stage and a two-week contest stage, consisting of five rounds, and seven teams succeeded in finishing both stages to the end. In this joint report of the winner team Panda and the problem design committee coordinated by Mojtaba Tefagh, we first explain each of the five rounds and then provide the solutions proposed by our team (Panda) to fulfill the required tasks in the fastest and most accurate way. Afterward, some preprocessing and data manipulating ideas used to enhance the algorithms would be presented. All codes are written in the Julia language, which showed a better performance than Python on optimization problems in our comparisons during the R&D stage, and are publicly available in the Github repository: https://github.com/Optimizer-Competition-Panda

[{'version': 'v1', 'created': 'Sat, 2 Oct 2021 14:55:49 GMT'}]

2021-10-05

[array(['Fathi', 'Ali', ''], dtype=object) array(['Rashid', 'Mohammad', ''], dtype=object) array(['Ranjbarzadeh', 'Shayan', ''], dtype=object) array(['Tefagh', 'Mojtaba', ''], dtype=object)]

1304.7384

Stefano Biagi Doc

Stefano Biagi

On M. M\'erigot's theorem on the convergence domain of the Campbell-Baker-Hausdorff-Dynkin series

math.CA math.AP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The aim of this manuscript is to present the proof given by Michel M\'erigot in 1974 for an enlarged convergence domain of the Campbell-Baker-Hausdorff-Dynkin series in the Lie algebra of a Banach-Lie group. This proof is based on a theorem, of independent interest, on the lifetime of the solution of a Cauchy problem. We furnish all the details for this ODE result in Appendix A.

[{'version': 'v1', 'created': 'Sat, 27 Apr 2013 16:08:57 GMT'}]

2013-04-30

[array(['Biagi', 'Stefano', ''], dtype=object)]

1208.3171

Grey Ercole Ph. D.

Hamilton Bueno and Grey Ercole

A quasilinear problem with fast growing gradient

Applied Mathematics Letters 26 (2013) 520-523

10.1016/j.aml.2012.12.009

math.AP

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper we consider the following Dirichlet problem for the $p$-Laplacian in the positive parameters $\lambda$ and $\beta$: [{{array} [c]{rcll}% -\Delta_{p}u & = & \lambda h(x,u)+\beta f(x,u,\nabla u) & \text{in}\Omega u & = & 0 & \text{on}\partial\Omega, {array}. \hfill] where $h,f$ are continuous nonlinearities satisfying $0\leq\omega_{1}(x)u^{q-1}\leq h(x,u)\leq\omega_{2}(x)u^{q-1}$ with $1<q<p$ and $0\leq f(x,u,v)\leq\omega_{3}(x)u^{a}|v|^{b}$, with $a,b>0$, and $\Omega$ is a bounded domain of $\mathbb{R}^{N},$ $N\geq3.$ The functions $\omega_{i}$, $1\leq i\leq3$, are nonnegative, continuous weights in $\bar{\Omega}$. We prove that there exists a region $\mathcal{D}$ in the $\lambda\beta$-plane where the Dirichlet problem has at least one positive solution. The novelty in this paper is that our result is valid for nonlinearities with growth higher than $p$ in the gradient variable.

[{'version': 'v1', 'created': 'Wed, 15 Aug 2012 18:27:59 GMT'} {'version': 'v2', 'created': 'Sun, 21 Oct 2012 02:17:56 GMT'}]

2013-03-28

[array(['Bueno', 'Hamilton', ''], dtype=object) array(['Ercole', 'Grey', ''], dtype=object)]

1805.01167

Qiangpeng Yang

Qiangpeng Yang, Mengli Cheng, Wenmeng Zhou, Yan Chen, Minghui Qiu, Wei Lin, Wei Chu

IncepText: A New Inception-Text Module with Deformable PSROI Pooling for Multi-Oriented Scene Text Detection

Accepted by IJCAI 2018

cs.CV

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Incidental scene text detection, especially for multi-oriented text regions, is one of the most challenging tasks in many computer vision applications. Different from the common object detection task, scene text often suffers from a large variance of aspect ratio, scale, and orientation. To solve this problem, we propose a novel end-to-end scene text detector IncepText from an instance-aware segmentation perspective. We design a novel Inception-Text module and introduce deformable PSROI pooling to deal with multi-oriented text detection. Extensive experiments on ICDAR2015, RCTW-17, and MSRA-TD500 datasets demonstrate our method's superiority in terms of both effectiveness and efficiency. Our proposed method achieves 1st place result on ICDAR2015 challenge and the state-of-the-art performance on other datasets. Moreover, we have released our implementation as an OCR product which is available for public access.

[{'version': 'v1', 'created': 'Thu, 3 May 2018 08:37:28 GMT'} {'version': 'v2', 'created': 'Tue, 8 May 2018 03:01:23 GMT'}]

2018-05-09

[array(['Yang', 'Qiangpeng', ''], dtype=object) array(['Cheng', 'Mengli', ''], dtype=object) array(['Zhou', 'Wenmeng', ''], dtype=object) array(['Chen', 'Yan', ''], dtype=object) array(['Qiu', 'Minghui', ''], dtype=object) array(['Lin', 'Wei', ''], dtype=object) array(['Chu', 'Wei', ''], dtype=object)]

1909.06390

Rostom Mbarek

Rostom Mbarek, Damiano Caprioli

Espresso Acceleration of Ultra-High-Energy Cosmic Rays up to the Hillas Limit in Relativistic MHD Jets

36th International Cosmic Ray Conference (ICRC2019), held July 24th-August 1st, 2019 in Madison, WI, U.S.A. Online at https://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=358, id.348

astro-ph.HE

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Espresso is a novel acceleration model for Ultra-High-Energy Cosmic Rays (UHECRs), where lower-energy CRs produced in supernova remnants experience a one-shot reacceleration in the relativistic jets of powerful Active Galactic Nuclei (AGNs) to reach energies up to $10^{20}$ eV. To test the espresso framework, we follow UHECR acceleration bottom-up from injection to the highest energies by propagating 100,000 particles in realistic 3D magneto-hydrodynamic (MHD) simulations of ultra-relativistic jets. We find that simulations agree well with analytical expectations in terms of trajectories of individual particles. We also quantify that $\sim 10\%$ of CR seeds gain a factor of $\sim\Gamma^2$ in energy, where $\Gamma$ is the jet's effective Lorentz factor; moreover, about $0.1\%$ of the particles undergo two or more shots to achieve gains in excess of $\Gamma^2$. Particles are generally accelerated up to the jet's Hillas limit, indicating that the espresso mechanism should boost galactic CRs to UHECRs in typical AGN jets. Finally, we discuss how espresso acceleration in AGN jets is consistent with UHECR spectra and chemical composition, and also with the UHECR arrival directions measured by Auger and Telescope Array.

[{'version': 'v1', 'created': 'Fri, 13 Sep 2019 18:02:51 GMT'}]

2019-09-17

[array(['Mbarek', 'Rostom', ''], dtype=object) array(['Caprioli', 'Damiano', ''], dtype=object)]

1508.03685

Masaaki Umehara

Naoya Ando, Toshifumi Fujiyama and Masaaki Umehara

C^1-umbilics with arbitrarily high indices

Pacific J. Math. 288 (2017) 1-26

10.2140/pjm.2017.288.1

math.DG

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, the existence of C^1-umbilics with arbitrarily high indices is shown. This implies that more than C^1-regularity is required to prove Loewner's conjecture.

[{'version': 'v1', 'created': 'Sat, 15 Aug 2015 01:18:44 GMT'}]

2017-04-19

[array(['Ando', 'Naoya', ''], dtype=object) array(['Fujiyama', 'Toshifumi', ''], dtype=object) array(['Umehara', 'Masaaki', ''], dtype=object)]