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1401.3978
Grazia Salerno
Grazia Salerno and Iacopo Carusotto
Dynamical decoupling and dynamical isolation in temporally modulated coupled pendulums
7 pages, 5 figures
EPL, 106 (2014) 24002
10.1209/0295-5075/106/24002
null
physics.class-ph cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically study the dynamics of a pair of coupled pendulums subject to a periodic temporal modulation of their oscillation frequency. Inspired from analogous developments in quantum mechanics, we anticipate dynamical localization and dynamical isolation effects, as well as the occurrence of non-trivial coupling phases. Perspectives in the direction of studying synthetic gauge fields in a classical mechanics context are outlined.
[ { "created": "Thu, 16 Jan 2014 10:37:36 GMT", "version": "v1" }, { "created": "Wed, 16 Apr 2014 05:12:44 GMT", "version": "v2" } ]
2015-07-20
[ [ "Salerno", "Grazia", "" ], [ "Carusotto", "Iacopo", "" ] ]
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1401.3985
Md Abdullah Al Mamun
Md Abdullah Al Mamun, Christian Berger, J\"orgen Hansson
Engineering the Hardware/Software Interface for Robotic Platforms - A Comparison of Applied Model Checking with Prolog and Alloy
Presented at DSLRob 2013 (arXiv:cs/1312.5952)
null
null
DSLRob/2013/02
cs.SE cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Robotic platforms serve different use cases ranging from experiments for prototyping assistive applications up to embedded systems for realizing cyber-physical systems in various domains. We are using 1:10 scale miniature vehicles as a robotic platform to conduct research in the domain of self-driving cars and collaborative vehicle fleets. Thus, experiments with different sensors like e.g.~ultra-sonic, infrared, and rotary encoders need to be prepared and realized using our vehicle platform. For each setup, we need to configure the hardware/software interface board to handle all sensors and actors. Therefore, we need to find a specific configuration setting for each pin of the interface board that can handle our current hardware setup but which is also flexible enough to support further sensors or actors for future use cases. In this paper, we show how to model the domain of the configuration space for a hardware/software interface board to enable model checking for solving the tasks of finding any, all, and the best possible pin configuration. We present results from a formal experiment applying the declarative languages Alloy and Prolog to guide the process of engineering the hardware/software interface for robotic platforms on the example of a configuration complexity up to ten pins resulting in a configuration space greater than 14.5 million possibilities. Our results show that our domain model in Alloy performs better compared to Prolog to find feasible solutions for larger configurations with an average time of 0.58s. To find the best solution, our model for Prolog performs better taking only 1.38s for the largest desired configuration; however, this important use case is currently not covered by the existing tools for the hardware used as an example in this article.
[ { "created": "Thu, 16 Jan 2014 10:53:35 GMT", "version": "v1" } ]
2014-01-17
[ [ "Mamun", "Md Abdullah Al", "" ], [ "Berger", "Christian", "" ], [ "Hansson", "Jörgen", "" ] ]
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1401.3995
Henning Maier
Henning Maier, Anas Chaaban and Rudolf Mathar
$Y$-$\Delta$ Product in 3-Way $\Delta$ and Y-Channels for Cyclic Interference and Signal Alignment
5 pages, submitted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a full-duplex 3-way $\Delta$ channel, three transceivers communicate to each other, so that a number of six messages is exchanged. In a $Y$-channel, however, these three transceivers are connected to an intermediate full-duplex relay. Loop-back self-interference is suppressed perfectly. The relay forwards network-coded messages to their dedicated users by means of interference alignment (IA) and signal alignment. A conceptual channel model with cyclic shifts described by a polynomial ring is considered for these two related channels. The maximally achievable rates in terms of the degrees of freedom measure are derived. We observe that the Y-channel and the 3-way $\Delta$ channel provide a $Y$-$\Delta$ product relationship. Moreover, we briefly discuss how this analysis relates to spatial IA and MIMO IA.
[ { "created": "Thu, 16 Jan 2014 11:37:59 GMT", "version": "v1" } ]
2014-01-17
[ [ "Maier", "Henning", "" ], [ "Chaaban", "Anas", "" ], [ "Mathar", "Rudolf", "" ] ]
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1401.3998
Hugo Meric
Hugo Meric, Jose Miguel Piquer
Performance Evaluation of Bit Division Multiplexing combined with Non-Uniform QAM
Submitted for publication
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Broadcasting systems have to deal with channel variability in order to offer the best spectral efficiency to the receivers. However, the transmission parameters that maximise the spectral efficiency generally leads to a large link unavailability. In this paper, we study analytically the trade-off between spectral efficiency and coverage for various channel resource allocation strategies when broadcasting two services. More precisely, we consider the following strategies: time sharing, hierarchical modulation and bit division multiplexing. Our main contribution is the combination of bit division multiplexing with non-uniform QAM to improve the performance of broadcasting systems. The results show that this scheme outperforms all the previous channel resource allocation strategies.
[ { "created": "Thu, 16 Jan 2014 11:54:45 GMT", "version": "v1" } ]
2014-01-17
[ [ "Meric", "Hugo", "" ], [ "Piquer", "Jose Miguel", "" ] ]
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1401.3999
Nuno de Sousa
N. de Sousa, J.J. S\'aenz, A. Garc\'ia-Mart\'in, L.S. Froufe-P\'erez, M.I. Marqu\'es
Effect of long range spatial correlations on the lifetime statistics of an emitter in a two-dimensional disordered lattice
6 pages, 5 figures
null
10.1103/PhysRevA.89.063830
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The effect of spatial correlations on the Purcell effect in a bidimensional dispersion of resonant nanoparticles is analyzed. We perform extensive calculations on the fluorescence decay rate of a point emitter embedded in a system of nanoparticles statistically distributed according to a simple 2D lattice-gas model near the critical point. For short-range correlations (high temperature thermalization) the Purcell factors present a long-tailed statistic which evolves towards a bimodal distribution when approaching the critical point where the spatial correlation length diverges. Our results suggest long-range correlations as a possible origin of the large fluctuations of experimental decay rates in disordered metal films.
[ { "created": "Thu, 16 Jan 2014 11:55:52 GMT", "version": "v1" }, { "created": "Tue, 15 Apr 2014 09:28:35 GMT", "version": "v2" }, { "created": "Tue, 10 Jun 2014 09:37:21 GMT", "version": "v3" } ]
2015-06-18
[ [ "de Sousa", "N.", "" ], [ "Sáenz", "J. J.", "" ], [ "García-Martín", "A.", "" ], [ "Froufe-Pérez", "L. S.", "" ], [ "Marqués", "M. I.", "" ] ]
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1401.4002
Daniyar Shamkanov
Daniyar Shamkanov
Circular Proofs for G\"odel-L\"ob Logic
13 pages
Mathematical Notes. 2014. Vol. 96. No. 4. P. 575-585
10.1134/S0001434614090326
null
math.LO cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a sequent-style proof system for provability logic GL that admits so-called circular proofs. For these proofs, the graph underlying a proof is not a finite tree but is allowed to contain cycles. As an application, we establish Lindon interpolation for GL syntactically.
[ { "created": "Thu, 16 Jan 2014 12:06:40 GMT", "version": "v1" } ]
2015-01-05
[ [ "Shamkanov", "Daniyar", "" ] ]
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1401.4005
Bartlomiej Blaszczyszyn
Bartlomiej Blaszczyszyn (INRIA Paris-Rocquencourt), Holger Paul Keeler (INRIA Paris-Rocquencourt)
Studying the SINR process of the typical user in Poisson networks by using its factorial moment measures
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null
null
null
cs.NI math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on a stationary Poisson point process, a wireless network model with random propagation effects (shadowing and/or fading) is considered in order to examine the process formed by the signal-to-interference-plus-noise ratio (SINR) values experienced by a typical user with respect to all base stations in the down-link channel. This SINR process is completely characterized by deriving its factorial moment measures, which involve numerically tractable, explicit integral expressions. This novel framework naturally leads to expressions for the k-coverage probability, including the case of random SINR threshold values considered in multi-tier network models. While the k-coverage probabilities correspond to the marginal distributions of the order statistics of the SINR process, a more general relation is presented connecting the factorial moment measures of the SINR process to the joint densities of these order statistics. This gives a way for calculating exact values of the coverage probabilities arising in a general scenario of signal combination and interference cancellation between base stations. The presented framework consisting of mathematical representations of SINR characteristics with respect to the factorial moment measures holds for the whole domain of SINR and is amenable to considerable model extension.
[ { "created": "Thu, 16 Jan 2014 12:15:44 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 12:03:37 GMT", "version": "v2" }, { "created": "Wed, 11 Mar 2015 14:54:01 GMT", "version": "v3" } ]
2015-03-12
[ [ "Blaszczyszyn", "Bartlomiej", "", "INRIA Paris-Rocquencourt" ], [ "Keeler", "Holger Paul", "", "INRIA Paris-Rocquencourt" ] ]
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1401.4009
Pedro Correia
P.M.M. Correia (1), C.A.B. Oliveira (1 and 2), C.D.R. Azevedo (1), A.L.M. Silva (1), R. Veenhof (3), Mythra Varun Nemallapudi (3) and J.F.C.A. Veloso (1) ((1) I3N -Physics Department, University of Aveiro, (2) Lawrence Berkeley National Laboratory, (3) CERN RD-51 Collaboration)
A dynamic method for charging-up calculations: the case of GEM
Minor changes in grammatical statements and inclusion of some important information about experimental setup at section "Comparison with experimental results"
null
10.1088/1748-0221/9/07/P07025
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The simulation of Micro Pattern Gaseous Detectors (MPGDs) signal response is an important and powerful tool for the design and optimization of such detectors. However, several attempts to simulate exactly the effective charge gain have not been completely successful. Namely, the gain stability over time has not been fully understood. Charging-up of the insulator surfaces have been pointed as one of the responsible for the difference between experimental and Monte Carlo results. This work describes two iterative methods to simulate the charging-up in one MPGD device, the Gas Electron Multiplier (GEM). The first method uses a constant step for avalanches time evolution, very detailed, but slower to compute. The second method uses a dynamic step that improves the computing time. Good agreement between both methods was reached. Despite of comparison with experimental results shows that charging-up plays an important role in detectors operation, should not be the only responsible for the difference between simulated and measured effective gain, but explains the time evolution in the effective gain.
[ { "created": "Thu, 16 Jan 2014 12:44:15 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 20:43:47 GMT", "version": "v2" } ]
2015-06-18
[ [ "Correia", "P. M. M.", "", "1 and 2" ], [ "Oliveira", "C. A. B.", "", "1 and 2" ], [ "Azevedo", "C. D. R.", "" ], [ "Silva", "A. L. M.", "" ], [ "Veenhof", "R.", "" ], [ "Nemallapudi", "Mythra Varun", "" ], [ "Veloso", "J. F. C. A.", "" ] ]
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1401.4012
Kiran Sree Pokkuluri Prof
Pokkuluri Kiran Sree, Inampudi Ramesh Babu
Towards a Cellular Automata Based Network Intrusion Detection System with Power Level Metric in Wireless Adhoc Networks (IDFADNWCA)
2008 International Conference on Advanced Computer Theory and Engineering,978-0-7695-3489-3/08, IEEE. arXiv admin note: text overlap with arXiv:1401.3046
null
10.1109/ICACTE.2008.160
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Adhoc wireless network with their changing topology and distributed nature are more prone to intruders. The efficiency of an Intrusion detection system in the case of an adhoc network is not only determined by its dynamicity in monitoring but also in its flexibility in utilizing the available power in each of its nodes. In this paper we propose a hybrid intrusion detection system, based on a power level metric for potential adhoc hosts, which is used to determine the duration for which a particular node can support a network-monitoring node. The detection of intrusions in the network is done with the help of Cellular Automata (CA). IDFADNWCA (Intrusion Detection for Adhoc Networks with Cellular Automata) focuses on the available power level in each of the nodes and determines the network monitors. Power Level Metric in the network results in maintaining power for network monitoring, with monitors changing often, since it is an iterative power optimal solution to identify nodes for distributed agent based intrusion detection. The advantage of this approach entails is the inherent flexibility it provides, by means of considering only fewer nodes for reestablishing network monitors.
[ { "created": "Thu, 16 Jan 2014 13:07:57 GMT", "version": "v1" } ]
2014-01-17
[ [ "Sree", "Pokkuluri Kiran", "" ], [ "Babu", "Inampudi Ramesh", "" ] ]
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1401.4013
Stanislav Maslovski
Stanislav I. Maslovski, Constantin R. Simovski
Equivalent Circuit Analysis of Super-Planckian Emission into Far Field
Conference abstract submitted to NanoRad2014: http://nanorad2014.shiep.edu.cn
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using our recently developed equivalent circuit model of radiative heat transfer we analyze the far-field thermal emission from bodies of constrained dimensions. We prove that the power radiated by a hypothetical metamaterial emitter which is conjugate matched with all the harmonics of the emitted field at a given wavelength can be infinitely higher than the power emitted by an ideal black body of the same radius. However, for optically large bodies, fulfilling the conjugate match conditions for higher-order harmonics is not a trivial task, which effectively limits the far-field radiated power by the well-known Planck law.
[ { "created": "Thu, 16 Jan 2014 13:08:51 GMT", "version": "v1" } ]
2014-01-17
[ [ "Maslovski", "Stanislav I.", "" ], [ "Simovski", "Constantin R.", "" ] ]
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1401.4019
Pedro Chamorro-Posada
Pedro Chamorro-Posada and F. Javier Fraile-Pel\'aez
Phase asymmetry effect in longitudinal offset coupled resonator optical waveguides
null
null
10.1109/LPT.2014.2327019
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the implementation of the longitudinal displacement technique for adjusting the coupling coefficients in microring waveguides is subject to a phase asymmetry effect. This issue is shown to substantially alter the system response in apodized filters and cannot be ignored in the design stage.
[ { "created": "Thu, 16 Jan 2014 13:22:38 GMT", "version": "v1" } ]
2015-06-18
[ [ "Chamorro-Posada", "Pedro", "" ], [ "Fraile-Peláez", "F. Javier", "" ] ]
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1401.4020
Tong Zhou
Tong Zhou
Robust Recursive State Estimation with Random Measurements Droppings
36 pages, 2 figures
IEEE Transactions on Automatic Control, Vol.61, No.1, pp.156-171, 2016
10.1109/TAC.2015.2437524
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A recursive state estimation procedure is derived for a linear time varying system with both parametric uncertainties and stochastic measurement droppings. This estimator has a similar form as that of the Kalman filter with intermittent observations, but its parameters should be adjusted when a plant output measurement arrives. A new recursive form is derived for the pseudo-covariance matrix of estimation errors, which plays important roles in analyzing its asymptotic properties. Based on a Riemannian metric for positive definite matrices, some necessary and sufficient conditions have been obtained for the strict contractiveness of an iteration of this recursion. It has also been proved that under some controllability and observability conditions, as well as some weak requirements on measurement arrival probability, the gain matrix of this recursive robust state estimator converges in probability one to a stationary distribution. Numerical simulation results show that estimation accuracy of the suggested procedure is more robust against parametric modelling errors than the Kalman filter.
[ { "created": "Thu, 16 Jan 2014 13:22:54 GMT", "version": "v1" } ]
2016-11-17
[ [ "Zhou", "Tong", "" ] ]
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1401.4023
Tong Zhou
Tong Zhou
Asymptotic Behavior of the Pseudo-Covariance Matrix of a Robust State Estimator with Intermittent Measurements
33 pages, 3 figures, 3 tables
IEEE Transactions on Automatic Control, Vol.61, No.2, pp.400-415, 2016
null
null
cs.SY cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ergodic properties and asymptotic stationarity are investigated in this paper for the pseudo-covariance matrix (PCM) of a recursive state estimator which is robust against parametric uncertainties and is based on plant output measurements that may be randomly dropped. When the measurement dropping process is described by a Markov chain and the modified plant is both controllable and observable, it is proved that if the dropping probability is less than 1, this PCM converges to a stationary distribution that is independent of its initial values. A convergence rate is also provided. In addition, it has also been made clear that when the initial value of the PCM is set to the stabilizing solution of the algebraic Riccati equation related to the robust state estimator without measurement dropping, this PCM converges to an ergodic process. Based on these results, two approximations are derived for the probability distribution function of the stationary PCM, as well as a bound of approximation errors. A numerical example is provided to illustrate the obtained theoretical results.
[ { "created": "Thu, 16 Jan 2014 13:36:54 GMT", "version": "v1" } ]
2016-10-12
[ [ "Zhou", "Tong", "" ] ]
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1401.4025
Micha{\l} Skrzypczak
Henryk Michalewski and Micha{\l} Skrzypczak
Unambiguous Buchi is weak
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null
null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A non-deterministic automaton running on infinite trees is unambiguous if it has at most one accepting run on every tree. The class of languages recognisable by unambiguous tree automata is still not well-understood. In particular, decidability of the problem whether a given language is recognisable by some unambiguous automaton is open. Moreover, there are no known upper bounds on the descriptive complexity of unambiguous languages among all regular tree languages. In this paper we show the following complexity collapse: if a non-deterministic parity tree automaton $A$ is unambiguous and its priorities are between $i$ and $2n$ then the language recognised by $A$ is in the class $Comp(i+1,2n)$. A particular case of this theorem is for $i=n=1$: if $A$ is an unambiguous Buchi tree automaton then $L(A)$ is recognisable by a weak alternating automaton (or equivalently definable in weak MSO). The main motivation for this result is a theorem by Finkel and Simonnet stating that every unambiguous Buchi automaton recognises a Borel language. The assumptions of the presented theorem are syntactic (we require one automaton to be both unambiguous and of particular parity index). However, to the authors' best knowledge this is the first theorem showing a collapse of the parity index that exploits the fact that a given automaton is unambiguous.
[ { "created": "Thu, 16 Jan 2014 13:45:48 GMT", "version": "v1" }, { "created": "Fri, 17 Jan 2014 11:49:26 GMT", "version": "v2" }, { "created": "Mon, 9 May 2016 13:56:54 GMT", "version": "v3" } ]
2016-05-10
[ [ "Michalewski", "Henryk", "" ], [ "Skrzypczak", "Michał", "" ] ]
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1401.4030
Luk Arnaut
Luk R. Arnaut, Mihai I. Andries, Jerome Sol and Philippe Besnier
Measurement Method for Evaluating the Probability Distribution of the Quality Factor of Mode-Stirred Reverberation Chambers
submitted for publication
null
10.1109/TAP.2014.2327642
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An original experimental method for determining the empirical probability distribution function (PDF) of the quality factor (Q) of a mode-stirred reverberation chamber is presented. Spectral averaging of S-parameters across a relatively narrow frequency interval at a single pair of locations for the transmitting and receiving antennas is applied to estimate the stored and dissipated energy in the cavity, avoiding the need for spatial scanning to obtain spatial volume or surface averages. The effective number of simultaneously excited cavity modes per stir state, M, can be estimated by fitting the empirical distribution to the parametrized theoretical distribution. The measured results support a previously developed theoretical model for the PDF of Q and show that spectral averaging over a bandwidth as small as a few hundred kHz is sufficient to obtain accurate results.
[ { "created": "Thu, 16 Jan 2014 14:03:51 GMT", "version": "v1" } ]
2015-06-18
[ [ "Arnaut", "Luk R.", "" ], [ "Andries", "Mihai I.", "" ], [ "Sol", "Jerome", "" ], [ "Besnier", "Philippe", "" ] ]
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1401.4034
Ulrich Jentschura
U. D. Jentschura
From First Principles of QED to an Application: Hyperfine Structure of P States of Muonic Hydrogen
7 pages; RevTeX; originally published in Can.J.Phys. in 2011; contains a mini-review section on QED
Can.J.Phys. 89 (2011) 109-115
10.1139/P10-092
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The purpose of this article is twofold. First, we attempt to give a brief overview of the different application areas of quantum electrodynamics (QED). These include fundamental physics (prediction of atomic energy levels), where the atom may be exposed to additional external fields (hyperfine splitting and g factor). We also mention QED processes in highly intense laser fields, and more applied areas like Casimir and Casimir--Polder interactions. Both the unifying aspects as well as the differences in the the theoretical treatment required by these application areas (such as the treatment of infinities) are highlighted. Second, we discuss an application of the formalism in the fundamentally interesting area of the prediction of energy levels, namely, the hyperfine structure of P states of muonic hydrogen.
[ { "created": "Thu, 16 Jan 2014 14:14:42 GMT", "version": "v1" } ]
2014-01-17
[ [ "Jentschura", "U. D.", "" ] ]
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1401.4043
Alexander Lisyansky
A. A. Zyablovsky, A. P. Vinogradov, A. V. Dorofeenko, A. A. Pukhov, and A. A. Lisyansky
Causality and phase transitions in PT-symmetrical optical systems
null
Phys. Rev. A 89, 033808 (2014)
10.1103/PhysRevA.89.033808
null
physics.optics cond-mat.mes-hall quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss phase transitions in PT-symmetric optical systems. We show that due to frequency dispersion of the dielectric permittivity, an optical system can have PT-symmetry at isolated frequency points only. An assumption of the existence of a PT-symmetric system in a continuous frequency interval violates the causality principle. Therefore, the ideal symmetry-breaking transition cannot be observed by simply varying the frequency.
[ { "created": "Thu, 16 Jan 2014 14:39:06 GMT", "version": "v1" } ]
2015-06-18
[ [ "Zyablovsky", "A. A.", "" ], [ "Vinogradov", "A. P.", "" ], [ "Dorofeenko", "A. V.", "" ], [ "Pukhov", "A. A.", "" ], [ "Lisyansky", "A. A.", "" ] ]
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1401.4045
Paolo Saracco
Paolo Saracco, Maria Grazia Pia, Matej Batic
Theoretical grounds for the propagation of uncertainties in Monte Carlo particle transport
12 pages, 9 figures
null
10.1109/TNS.2014.2300112
null
physics.data-an hep-ex nucl-ex physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a theoretical framework for the calculation of uncertainties affecting observables produced by Monte Carlo particle transport, which derive from uncertainties in physical parameters input into simulation. The theoretical developments are complemented by a heuristic application, which illustrates the method of calculation in a streamlined simulation environment.
[ { "created": "Thu, 16 Jan 2014 14:41:23 GMT", "version": "v1" } ]
2014-01-17
[ [ "Saracco", "Paolo", "" ], [ "Pia", "Maria Grazia", "" ], [ "Batic", "Matej", "" ] ]
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1401.4050
Peixiang Lu
Yang Li, Xiaosong Zhu, Pengfei Lan, Qingbin Zhang, Meiyan Qin and Peixiang Lu
Molecular orbital tomography beyond the plane wave approximation
null
null
10.1103/PhysRevA.89.045401
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The use of plane wave approximation in molecular orbital tomography via high-order harmonic generation has been questioned since it was proposed, owing to the fact that it ignores the essential property of the continuum wave function. To address this problem, we develop a theory to retrieve the valence molecular orbital directly utilizing molecular continuum wave function which takes into account the influence of the parent ion field on the continuum electrons. By transforming this wave function into momentum space, we show that the mapping from the relevant molecular orbital to the high-order harmonic spectra is still invertible. As an example, the highest orbital of $\mathrm{N_2}$ is successfully reconstructed and it shows good agreement with the \emph{ab initio} orbital. Our work clarifies the long-standing controversy and strengthens the theoretical basis of molecular orbital tomography.
[ { "created": "Thu, 16 Jan 2014 14:47:48 GMT", "version": "v1" }, { "created": "Thu, 20 Mar 2014 07:34:47 GMT", "version": "v2" } ]
2015-06-18
[ [ "Li", "Yang", "" ], [ "Zhu", "Xiaosong", "" ], [ "Lan", "Pengfei", "" ], [ "Zhang", "Qingbin", "" ], [ "Qin", "Meiyan", "" ], [ "Lu", "Peixiang", "" ] ]
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1401.4055
Mahashweta Basu
Mahashweta Basu, Nitai P. Bhattacharyya, P. K. Mohanty
Universality splitting in distribution of number of miRNA co-targets
5 pages, 5 eps figures
Syst. Synth. Biol. 8, 21 (2014)
10.1007/s11693-014-9131-0
null
q-bio.GN physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a recent work [arXiv:1307.1382] it was pointed out that the link-weight distribution of microRNA (miRNA) co-target network of a wide class of species are universal up to scaling. The number cell types, widely accepted as a measure of complexity, turns out to be proportional to these scale-factor. In this article we discuss additional universal features of these networks and show that, this universality splits if one considers distribution of number of common targets of three or more number of miRNAs. These distributions for different species can be collapsed onto two distinct set of universal functions, revealing the fact that the species which appeared in early evolution have different complexity measure compared to those appeared late.
[ { "created": "Thu, 16 Jan 2014 15:03:37 GMT", "version": "v1" } ]
2014-05-20
[ [ "Basu", "Mahashweta", "" ], [ "Bhattacharyya", "Nitai P.", "" ], [ "Mohanty", "P. K.", "" ] ]
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1401.4063
Maciej Cytowski Mr
Jakub Katarzy\'nski and Maciej Cytowski
Towards Autotuning of OpenMP Applications on Multicore Architectures
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we describe an autotuning tool for optimization of OpenMP applications on highly multicore and multithreaded architectures. Our work was motivated by in-depth performance analysis of scientific applications and synthetic benchmarks on IBM Power 775 architecture. The tool provides an automatic code instrumentation of OpenMP parallel regions. Based on measurement of chosen hardware performance counters the tool decides on the number of parallel threads that should be used for execution of chosen code fragments.
[ { "created": "Thu, 16 Jan 2014 15:30:17 GMT", "version": "v1" } ]
2014-01-17
[ [ "Katarzyński", "Jakub", "" ], [ "Cytowski", "Maciej", "" ] ]
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1401.4068
Patricia Wollstadt
Patricia Wollstadt, Mario Mart\'inez-Zarzuela, Raul Vicente, Francisco J. D\'iaz-Pernas, Michael Wibral
Efficient transfer entropy analysis of non-stationary neural time series
27 pages, 7 figures, submitted to PLOS ONE
PLoS ONE 10(10): e0140530 (2014)
10.1371/journal.pone.0102833
null
cs.IT math.IT q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Information theory allows us to investigate information processing in neural systems in terms of information transfer, storage and modification. Especially the measure of information transfer, transfer entropy, has seen a dramatic surge of interest in neuroscience. Estimating transfer entropy from two processes requires the observation of multiple realizations of these processes to estimate associated probability density functions. To obtain these observations, available estimators assume stationarity of processes to allow pooling of observations over time. This assumption however, is a major obstacle to the application of these estimators in neuroscience as observed processes are often non-stationary. As a solution, Gomez-Herrero and colleagues theoretically showed that the stationarity assumption may be avoided by estimating transfer entropy from an ensemble of realizations. Such an ensemble is often readily available in neuroscience experiments in the form of experimental trials. Thus, in this work we combine the ensemble method with a recently proposed transfer entropy estimator to make transfer entropy estimation applicable to non-stationary time series. We present an efficient implementation of the approach that deals with the increased computational demand of the ensemble method's practical application. In particular, we use a massively parallel implementation for a graphics processing unit to handle the computationally most heavy aspects of the ensemble method. We test the performance and robustness of our implementation on data from simulated stochastic processes and demonstrate the method's applicability to magnetoencephalographic data. While we mainly evaluate the proposed method for neuroscientific data, we expect it to be applicable in a variety of fields that are concerned with the analysis of information transfer in complex biological, social, and artificial systems.
[ { "created": "Thu, 16 Jan 2014 15:55:11 GMT", "version": "v1" }, { "created": "Mon, 23 Nov 2015 10:53:17 GMT", "version": "v2" } ]
2015-11-24
[ [ "Wollstadt", "Patricia", "" ], [ "Martínez-Zarzuela", "Mario", "" ], [ "Vicente", "Raul", "" ], [ "Díaz-Pernas", "Francisco J.", "" ], [ "Wibral", "Michael", "" ] ]
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1401.4069
Marcel Ausloos
Marcel Ausloos
Binary Scientific Star Coauthors Core Size
30 pages, 8 Tables, 1 Appendix, 40 references, to be published in Scientometrics
Scientometrics (2014) 99: 331-351
10.1007/s11192-014-1230-x
null
physics.soc-ph cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is examined whether the relationship $ J \propto A/r^{\alpha}$, and the subsequent coauthor core notion (Ausloos 2013), between the number ($J$) of joint publications (JP) by a "main scientist" (LI) with her/his coauthors (CAs) can be extended to a team-like system. This is done by considering that each coauthor can be so strongly tied to the LI that they are forming {\it binary scientific star} (BSS) systems with respect to their other collaborators. Moreover, publications in peer review journals and in "proceedings", both often thought to be of "different quality", are separetely distinguished. The role of a time interval for measuring $J$ and $\alpha$ is also examined. New indirect measures are also introduced. For making the point, two LI cases with numerous CAs are studied. It is found that only a few BSS need to be usefully examined. The exponent $\alpha$ turns out to be "second scientist" weakly dependent, but still "size" and "publication type" dependent, according to the number of CAs or JP. The CA core value is found to be (CA or JP) size and publication type dependent, but remains in an understandable range. Somewhat unexpectedly, no special qualitative difference on the binary scientific star CA core value is found between publications in peer review journals and in proceedings. In conclusion, some remark is made on partner cooperation in BSS teams. It is suggested that such measures can serve as criteria for distinguishing the role of scientists in a team.
[ { "created": "Wed, 15 Jan 2014 15:37:54 GMT", "version": "v1" } ]
2014-04-14
[ [ "Ausloos", "Marcel", "" ] ]
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1401.4076
Johannes Zierenberg
Johannes Zierenberg, Micha Wiedenmann and Wolfhard Janke
Application of the parallel multicanonical method to lattice gas condensation
Contribution to the proceedings of "XXV IUPAP Conference on Computational Physics"
J. Phys: Conf. Ser. 510, 012017 (2014)
10.1088/1742-6596/510/1/012017
null
cond-mat.stat-mech physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the speedup from a novel parallel implementation of the multicanonical method on the example of a lattice gas in two and three dimensions. In this approach, all cores perform independent equilibrium runs with identical weights, collecting their sampled histograms after each iteration in order to estimate consecutive weights. The weights are then redistributed to all cores. These steps are repeated until the weights are converged. This procedure benefits from a minimum of communication while distributing the necessary amount of statistics efficiently. Using this method allows us to study a broad temperature range for a variety of large and complex systems. Here, a gas is modeled as particles on the lattice, which interact only with their nearest neighbors. For a fixed density this model is equivalent to the Ising model with fixed magnetization. We compare our results to an analytic prediction for equilibrium droplet formation, confirming that a single macroscopic droplet forms only above a critical density.
[ { "created": "Thu, 16 Jan 2014 16:19:06 GMT", "version": "v1" } ]
2015-01-27
[ [ "Zierenberg", "Johannes", "" ], [ "Wiedenmann", "Micha", "" ], [ "Janke", "Wolfhard", "" ] ]
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1401.4077
Alberto Favaro
Alberto Favaro and Friedrich W. Hehl
Fresnel versus Kummer surfaces: geometrical optics in dispersionless linear (meta)materials and vacuum
Invited lecture at "Electromagnetic Spacetimes", Wolfgang Pauli Institute, Vienna, 19--23 Nov 2012
null
null
null
gr-qc physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Geometrical optics describes, with good accuracy, the propagation of high-frequency plane waves through an electromagnetic medium. Under such approximation, the behaviour of the electromagnetic fields is characterised by just three quantities: the temporal frequency $\omega$, the spatial wave (co)vector $k$, and the polarisation (co)vector $a$. Numerous key properties of a given optical medium are determined by the Fresnel surface, which is the visual counterpart of the equation relating $\omega$ and $k$. For instance, the propagation of electromagnetic waves in a uniaxial crystal, such as calcite, is represented by two light-cones. Kummer, whilst analysing quadratic line complexes as models for light rays in an optical apparatus, discovered in the framework of projective geometry a quartic surface that is linked to the Fresnel one. Given an arbitrary dispersionless linear (meta)material or vacuum, we aim to establish whether the resulting Fresnel surface is equivalent to, or is more general than, a Kummer surface.
[ { "created": "Thu, 16 Jan 2014 16:22:07 GMT", "version": "v1" } ]
2014-01-17
[ [ "Favaro", "Alberto", "" ], [ "Hehl", "Friedrich W.", "" ] ]
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1401.4082
Shakir Mohamed
Danilo Jimenez Rezende, Shakir Mohamed, Daan Wierstra
Stochastic Backpropagation and Approximate Inference in Deep Generative Models
Appears In Proceedings of the 31st International Conference on Machine Learning (ICML), JMLR: W\&CP volume 32, 2014
null
null
null
stat.ML cs.AI cs.LG stat.CO stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We marry ideas from deep neural networks and approximate Bayesian inference to derive a generalised class of deep, directed generative models, endowed with a new algorithm for scalable inference and learning. Our algorithm introduces a recognition model to represent approximate posterior distributions, and that acts as a stochastic encoder of the data. We develop stochastic back-propagation -- rules for back-propagation through stochastic variables -- and use this to develop an algorithm that allows for joint optimisation of the parameters of both the generative and recognition model. We demonstrate on several real-world data sets that the model generates realistic samples, provides accurate imputations of missing data and is a useful tool for high-dimensional data visualisation.
[ { "created": "Thu, 16 Jan 2014 16:33:23 GMT", "version": "v1" }, { "created": "Fri, 9 May 2014 12:53:17 GMT", "version": "v2" }, { "created": "Fri, 30 May 2014 10:00:36 GMT", "version": "v3" } ]
2014-06-02
[ [ "Rezende", "Danilo Jimenez", "" ], [ "Mohamed", "Shakir", "" ], [ "Wierstra", "Daan", "" ] ]
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Stochastic Backpropagation and Approximate Inference in Deep Generative Models
http://arxiv.org/abs/1401.4082v3
http://arxiv.org/pdf/1401.4082v3.pdf
https://github.com/geoffroeder/iwae
false
false
https://paperswithcode.com/paper/stochastic-backpropagation-and-approximate
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1401.4087
Anatole Lupu
Anatole Lupu, Henri Benisty, Aloyse Degiron
Using PT-symmetry for switching applications
null
null
10.1016/j.photonics.2014.05.003
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work introduces a new class of PT-symmetry grating assisted devices for switching or modulation applications. Their operation is based on a four-wave interaction, thus marking a step in the further development of PT-symmetry devices which currently are essentially based on two-wave interactions. A remarkable feature of the new device is that all their properties also hold for the case of imperfect PT-symmetry operation, corresponding to the important practical case of fixed losses.
[ { "created": "Thu, 16 Jan 2014 16:47:33 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lupu", "Anatole", "" ], [ "Benisty", "Henri", "" ], [ "Degiron", "Aloyse", "" ] ]
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1401.4092
David Xiao
Kobbi Nissim and Salil Vadhan and David Xiao
Redrawing the Boundaries on Purchasing Data from Privacy-Sensitive Individuals
null
Proc. 5th ITCS, 2014
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove new positive and negative results concerning the existence of truthful and individually rational mechanisms for purchasing private data from individuals with unbounded and sensitive privacy preferences. We strengthen the impossibility results of Ghosh and Roth (EC 2011) by extending it to a much wider class of privacy valuations. In particular, these include privacy valuations that are based on ({\epsilon}, {\delta})-differentially private mechanisms for non-zero {\delta}, ones where the privacy costs are measured in a per-database manner (rather than taking the worst case), and ones that do not depend on the payments made to players (which might not be observable to an adversary). To bypass this impossibility result, we study a natural special setting where individuals have mono- tonic privacy valuations, which captures common contexts where certain values for private data are expected to lead to higher valuations for privacy (e.g. having a particular disease). We give new mech- anisms that are individually rational for all players with monotonic privacy valuations, truthful for all players whose privacy valuations are not too large, and accurate if there are not too many players with too-large privacy valuations. We also prove matching lower bounds showing that in some respects our mechanism cannot be improved significantly.
[ { "created": "Thu, 16 Jan 2014 17:02:17 GMT", "version": "v1" } ]
2014-01-17
[ [ "Nissim", "Kobbi", "" ], [ "Vadhan", "Salil", "" ], [ "Xiao", "David", "" ] ]
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1401.4101
Ofer Kfir
Ofer Kfir, Patrik Grychtol, Emrah Turgut, Ronny Knut, Dmitriy Zusin, Dimitar Popmintchev, Tenio Popmintchev, Hans Nembach, Justin M. Shaw, Avner Fleischer, Henry Kapteyn, Margaret Murnane and Oren Cohen
Generation of phase-matched circularly-polarized extreme ultraviolet high harmonics for magnetic circular dichroism spectroscopy
12 text pages, 4 figures, supplamentary information 6 pages
Nature Photonics 9, 99 (2015)
10.1038/nphoton.2014.293
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Circularly-polarized extreme UV and X-ray radiation provides valuable access to the structural, electronic and magnetic properties of materials. To date, this capability was available only at large-scale X-ray facilities such as synchrotrons. Here we demonstrate the first bright, phase-matched, extreme UV circularly-polarized high harmonics and use this new light source for magnetic circular dichroism measurements at the M-shell absorption edges of Co. We show that phase matching of circularly-polarized harmonics is unique and robust, producing a photon flux comparable to the linearly polarized high harmonic sources that have been used very successfully for ultrafast element-selective magneto-optic experiments. This work thus represents a critical advance that makes possible element-specific imaging and spectroscopy of multiple elements simultaneously in magnetic and other chiral media with very high spatial and temporal resolution, using tabletop-scale setups.
[ { "created": "Thu, 16 Jan 2014 17:38:26 GMT", "version": "v1" }, { "created": "Fri, 17 Jan 2014 05:59:39 GMT", "version": "v2" }, { "created": "Sat, 3 May 2014 06:52:27 GMT", "version": "v3" } ]
2017-06-27
[ [ "Kfir", "Ofer", "" ], [ "Grychtol", "Patrik", "" ], [ "Turgut", "Emrah", "" ], [ "Knut", "Ronny", "" ], [ "Zusin", "Dmitriy", "" ], [ "Popmintchev", "Dimitar", "" ], [ "Popmintchev", "Tenio", "" ], [ "Nembach", "Hans", "" ], [ "Shaw", "Justin M.", "" ], [ "Fleischer", "Avner", "" ], [ "Kapteyn", "Henry", "" ], [ "Murnane", "Margaret", "" ], [ "Cohen", "Oren", "" ] ]
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1401.4105
Yunjin Chen
Yunjin Chen, Thomas Pock and Horst Bischof
Learning $\ell_1$-based analysis and synthesis sparsity priors using bi-level optimization
5 pages, 1 figure, appear at the Workshop on Analysis Operator Learning vs. Dictionary Learning, NIPS 2012
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the analysis operator and synthesis dictionary learning problems based on the the $\ell_1$ regularized sparse representation model. We reveal the internal relations between the $\ell_1$-based analysis model and synthesis model. We then introduce an approach to learn both analysis operator and synthesis dictionary simultaneously by using a unified framework of bi-level optimization. Our aim is to learn a meaningful operator (dictionary) such that the minimum energy solution of the analysis (synthesis)-prior based model is as close as possible to the ground-truth. We solve the bi-level optimization problem using the implicit differentiation technique. Moreover, we demonstrate the effectiveness of our leaning approach by applying the learned analysis operator (dictionary) to the image denoising task and comparing its performance with state-of-the-art methods. Under this unified framework, we can compare the performance of the two types of priors.
[ { "created": "Thu, 16 Jan 2014 17:49:45 GMT", "version": "v1" } ]
2014-01-17
[ [ "Chen", "Yunjin", "" ], [ "Pock", "Thomas", "" ], [ "Bischof", "Horst", "" ] ]
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1401.4107
Yunjin Chen
Yunjin Chen, Thomas Pock, Ren\'e Ranftl and Horst Bischof
Revisiting loss-specific training of filter-based MRFs for image restoration
10 pages, 2 figures, appear at 35th German Conference, GCPR 2013, Saarbr\"ucken, Germany, September 3-6, 2013. Proceedings
null
10.1007/978-3-642-40602-7_30
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is now well known that Markov random fields (MRFs) are particularly effective for modeling image priors in low-level vision. Recent years have seen the emergence of two main approaches for learning the parameters in MRFs: (1) probabilistic learning using sampling-based algorithms and (2) loss-specific training based on MAP estimate. After investigating existing training approaches, it turns out that the performance of the loss-specific training has been significantly underestimated in existing work. In this paper, we revisit this approach and use techniques from bi-level optimization to solve it. We show that we can get a substantial gain in the final performance by solving the lower-level problem in the bi-level framework with high accuracy using our newly proposed algorithm. As a result, our trained model is on par with highly specialized image denoising algorithms and clearly outperforms probabilistically trained MRF models. Our findings suggest that for the loss-specific training scheme, solving the lower-level problem with higher accuracy is beneficial. Our trained model comes along with the additional advantage, that inference is extremely efficient. Our GPU-based implementation takes less than 1s to produce state-of-the-art performance.
[ { "created": "Thu, 16 Jan 2014 17:58:21 GMT", "version": "v1" } ]
2014-01-17
[ [ "Chen", "Yunjin", "" ], [ "Pock", "Thomas", "" ], [ "Ranftl", "René", "" ], [ "Bischof", "Horst", "" ] ]
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1401.4110
Kanti Aggarwal Dr.
K. M. Aggarwal and F. P. Keenan
Radiative rates for E1, E2, M1, and M2 transitions among the 3s$^2$3p$^5$, 3s3p$^6$, and 3s$^2$3p$^4$3d configurations of Cl-like W LVIII
Will appear in Can J. Phys. 92 (2014) xxx. Text 21 pages including 5 Tables
null
10.1139/cjp-2013-0681
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report calculations of energy levels, radiative decay rates, and lifetimes for transitions among the 3s$^2$3p$^5$, 3s3p$^6$, and 3s$^2$3p$^4$3d configurations of Cl-like W LVIII. The general-purpose relativistic atomic structure package (GRASP) has been adopted for our calculations. Comparisons are made with the most recent results of Mohan et al. [Can. J. Phys. {\bf 92} (2014) xxx] and discrepancies in lifetimes are noted, up to four orders of magnitude in some instances. Our energy levels are estimated to be accurate to better than 0.5\%, whereas results for radiative rates and lifetimes should be accurate to better than 20\%.
[ { "created": "Thu, 16 Jan 2014 18:07:02 GMT", "version": "v1" } ]
2015-06-18
[ [ "Aggarwal", "K. M.", "" ], [ "Keenan", "F. P.", "" ] ]
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1401.4111
Alexander Krupp
Alexander T. Krupp, Anita Gaj, Jonathan B. Balewski, Philipp Ilzh\"ofer, Sebastian Hofferberth, Robert L\"ow, Tilman Pfau, Markus Kurz, Peter Schmelcher
Alignment of D-state Rydberg molecules
10 pages and 8 figures including supplementary
null
10.1103/PhysRevLett.112.143008
null
physics.atom-ph cond-mat.quant-gas quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the formation of ultralong-range Rydberg D-state molecules via photoassociation in an ultracold cloud of rubidium atoms. By applying a magnetic offset field on the order of 10 G and high resolution spectroscopy, we are able to resolve individual rovibrational molecular states. A full theory, using the Born-Oppenheimer approximation including s- and p-wave scattering, reproduces the measured binding energies. The calculated molecular wavefunctions show that in the experiment we can selectively excite stationary molecular states with an extraordinary degree of alignment or anti-alignment with respect to the magnetic field axis.
[ { "created": "Thu, 16 Jan 2014 18:08:58 GMT", "version": "v1" } ]
2014-04-15
[ [ "Krupp", "Alexander T.", "" ], [ "Gaj", "Anita", "" ], [ "Balewski", "Jonathan B.", "" ], [ "Ilzhöfer", "Philipp", "" ], [ "Hofferberth", "Sebastian", "" ], [ "Löw", "Robert", "" ], [ "Pfau", "Tilman", "" ], [ "Kurz", "Markus", "" ], [ "Schmelcher", "Peter", "" ] ]
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1401.4112
Yunjin Chen
Yunjin Chen, Ren\'e Ranftl and Thomas Pock
A bi-level view of inpainting - based image compression
8 pages, 4 figures, best paper award of CVWW 2014, Computer Vision Winter Workshop, K\v{r}tiny, Czech Republic, 3-5th February 2014
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Inpainting based image compression approaches, especially linear and non-linear diffusion models, are an active research topic for lossy image compression. The major challenge in these compression models is to find a small set of descriptive supporting points, which allow for an accurate reconstruction of the original image. It turns out in practice that this is a challenging problem even for the simplest Laplacian interpolation model. In this paper, we revisit the Laplacian interpolation compression model and introduce two fast algorithms, namely successive preconditioning primal dual algorithm and the recently proposed iPiano algorithm, to solve this problem efficiently. Furthermore, we extend the Laplacian interpolation based compression model to a more general form, which is based on principles from bi-level optimization. We investigate two different variants of the Laplacian model, namely biharmonic interpolation and smoothed Total Variation regularization. Our numerical results show that significant improvements can be obtained from the biharmonic interpolation model, and it can recover an image with very high quality from only 5% pixels.
[ { "created": "Thu, 16 Jan 2014 18:10:56 GMT", "version": "v1" }, { "created": "Fri, 9 May 2014 16:24:26 GMT", "version": "v2" } ]
2014-05-12
[ [ "Chen", "Yunjin", "" ], [ "Ranftl", "René", "" ], [ "Pock", "Thomas", "" ] ]
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1401.4116
Stefano De Leo
Stefano De Leo, Gisele Ducati
The Snell law for quaternionic potentials
11 pages, 3 figures
Journal of Mathematical Physics 54,122109-9 (2013)
10.1063/1.4853895
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By using the analogy between optics and quantum mechanics, we obtain the Snell law for the planar motion of quantum particles in the presence of quaternionic potentials.
[ { "created": "Wed, 15 Jan 2014 10:50:31 GMT", "version": "v1" } ]
2014-01-17
[ [ "De Leo", "Stefano", "" ], [ "Ducati", "Gisele", "" ] ]
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1401.4118
Alexander I. Lvovsky
A. I. Lvovsky
Squeezed light
v2: Some editing, typos fixed. Section in book: Photonics Volume 1: Fundamentals of Photonics and Physics, pp. 121 - 164 Edited by D. Andrews Wiley, West Sussex, United Kingdom, 2015
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quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The squeezed state of the electromagnetic field can be generated in many nonlinear optical processes and finds a wide range of applications in quantum information processing and quantum metrology. This article reviews the basic properties of single-and dual-mode squeezed light states, methods of their preparation and detection, as well as their quantum technology applications.
[ { "created": "Wed, 15 Jan 2014 17:53:48 GMT", "version": "v1" }, { "created": "Thu, 28 Jul 2016 18:34:23 GMT", "version": "v2" } ]
2016-07-29
[ [ "Lvovsky", "A. I.", "" ] ]
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1401.4121
David Kleinhans
David Kleinhans
Towards a systematic characterization of the potential of demand side management
15 pages, 3 figures
null
null
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With an increasing share of electric energy produced from non-dispatchable renewable sources both energy storage and demand side management might gain tremendously in importance. While there has been significant progress in general properties and technologies of energy storage, the systematic characterization of features particular to demand side management such as its intermittent, time-dependent potential seems to be lagging behind. As a consequence, the development of efficient and sustainable strategies for demand side management and its integration into large-scale energy system models are impeded. This work introduces a novel framework for a systematic time-resolved characterization of the potential for demand side management. It is based on the specification of individual devices both with respect to their scheduled demand and their potential of load shifting. On larger scales sector-specific profiles can straightforwardly be taken into account. The potential for demand side management is then specified in terms of size and capacity of an equivalent storage device. This intermediate layer of abstraction isolates the gross effects and opportunities of demand side management from questions concerning the operation of individual devices, which eases the integration of the results in existing schemes for the commitment of production units and system models. The novel framework is applicable for conceptual or predictive approaches and for real-time optimization and operation of energy systems involving demand side management.
[ { "created": "Wed, 8 Jan 2014 08:24:57 GMT", "version": "v1" } ]
2014-01-17
[ [ "Kleinhans", "David", "" ] ]
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1401.4125
Frederic Darboux
Olivier Delestre (JAD), Fr\'ed\'eric Darboux (USS), Francois James (MAPMO), Carine Lucas (MAPMO), Christian Laguerre (MAPMO), Stephane Cordier (MAPMO)
FullSWOF: A free software package for the simulation of shallow water flows
38 pages
null
null
null
math.AP math.NA physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Numerical simulations of flows are required for numerous applications, and are usually carried out using shallow water equations. We describe the FullSWOF software which is based on up-to-date finite volume methods and well-balanced schemes to solve this kind of equations. It consists of a set of open source C++ codes, freely available to the community, easy to use, and open for further development. Several features make FullSWOF particularly suitable for applications in hydrology: small water heights and wet-dry transitions are robustly handled, rainfall and infiltration are incorporated, and data from grid-based digital topographies can be used directly. A detailed mathematical description is given here, and the capabilities of FullSWOF are illustrated based on analytic solutions and datasets of real cases. The codes, available in 1D and 2D versions, have been validated on a large set of benchmark cases, which are available together with the download information and documentation at http://www.univ-orleans.fr/mapmo/soft/FullSWOF/.
[ { "created": "Thu, 16 Jan 2014 18:49:24 GMT", "version": "v1" }, { "created": "Wed, 27 May 2015 08:22:18 GMT", "version": "v2" } ]
2015-05-28
[ [ "Delestre", "Olivier", "", "JAD" ], [ "Darboux", "Frédéric", "", "USS" ], [ "James", "Francois", "", "MAPMO" ], [ "Lucas", "Carine", "", "MAPMO" ], [ "Laguerre", "Christian", "", "MAPMO" ], [ "Cordier", "Stephane", "", "MAPMO" ] ]
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1401.4126
Alberto Montina
Alberto Montina, Stefan Wolf
Lower bounds on the communication complexity of two-party (quantum) processes
Conference version. A more extensive version with more details will be available soon
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quant-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The process of state preparation, its transmission and subsequent measurement can be classically simulated through the communication of some amount of classical information. Recently, we proved that the minimal communication cost is the minimum of a convex functional over a space of suitable probability distributions. It is now proved that this optimization problem is the dual of a geometric programming maximization problem, which displays some appealing properties. First, the number of variables grows linearly with the input size. Second, the objective function is linear in the input parameters and the variables. Finally, the constraints do not depend on the input parameters. These properties imply that, once a feasible point is found, the computation of a lower bound on the communication cost in any two-party process is linearly complex. The studied scenario goes beyond quantum processes and includes the communication complexity scenario introduced by Yao. We illustrate the method by analytically deriving some non-trivial lower bounds. Finally, we conjecture the lower bound $n 2^n$ for a noiseless quantum channel with capacity $n$ qubits. This bound can have an interesting consequence in the context of the recent quantum-foundational debate on the reality of the quantum state.
[ { "created": "Thu, 16 Jan 2014 18:50:58 GMT", "version": "v1" } ]
2014-01-17
[ [ "Montina", "Alberto", "" ], [ "Wolf", "Stefan", "" ] ]
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1401.4127
Emanuel Diamant
Emanuel Diamant
Cognitive Robotics: for never was a story of more woe than this
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cs.RO cs.CY q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We are now on the verge of the next technical revolution - robots are going to invade our lives. However, to interact with humans or to be incorporated into a human "collective" robots have to be provided with some human-like cognitive abilities. What does it mean? - nobody knows. But robotics research communities are trying hard to find out a way to cope with this problem. Meanwhile, despite abundant funding these efforts did not lead to any meaningful result (only in Europe, only in the past ten years, Cognitive Robotics research funding has reached a ceiling of 1.39 billion euros). In the next ten years, a similar budget is going to be spent to tackle the Cognitive Robotics problems in the frame of the Human Brain Project. There is no reason to expect that this time the result will be different. I would like to try to explain why I'm so unhappy about this.
[ { "created": "Wed, 8 Jan 2014 13:05:55 GMT", "version": "v1" }, { "created": "Sat, 12 Jul 2014 04:40:29 GMT", "version": "v2" }, { "created": "Sat, 19 Jul 2014 18:32:34 GMT", "version": "v3" } ]
2014-07-22
[ [ "Diamant", "Emanuel", "" ] ]
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1401.4128
Charles-Henri Cappelaere
Charles-Henri Cappelaere, R. Dubois, P. Roussel, G. Dreyfus
Towards the selection of patients requiring ICD implantation by automatic classification from Holter monitoring indices
Computing in Cardiology, Saragosse : Espagne (2013)
null
null
null
cs.LG stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The purpose of this study is to optimize the selection of prophylactic cardioverter defibrillator implantation candidates. Currently, the main criterion for implantation is a low Left Ventricular Ejection Fraction (LVEF) whose specificity is relatively poor. We designed two classifiers aimed to predict, from long term ECG recordings (Holter), whether a low-LVEF patient is likely or not to undergo ventricular arrhythmia in the next six months. One classifier is a single hidden layer neural network whose variables are the most relevant features extracted from Holter recordings, and the other classifier has a structure that capitalizes on the physiological decomposition of the arrhythmogenic factors into three disjoint groups: the myocardial substrate, the triggers and the autonomic nervous system (ANS). In this ad hoc network, the features were assigned to each group; one neural network classifier per group was designed and its complexity was optimized. The outputs of the classifiers were fed to a single neuron that provided the required probability estimate. The latter was thresholded for final discrimination A dataset composed of 186 pre-implantation 30-mn Holter recordings of patients equipped with an implantable cardioverter defibrillator (ICD) in primary prevention was used in order to design and test this classifier. 44 out of 186 patients underwent at least one treated ventricular arrhythmia during the six-month follow-up period. Performances of the designed classifier were evaluated using a cross-test strategy that consists in splitting the database into several combinations of a training set and a test set. The average arrhythmia prediction performances of the ad-hoc classifier are NPV = 77% $\pm$ 13% and PPV = 31% $\pm$ 19% (Negative Predictive Value $\pm$ std, Positive Predictive Value $\pm$ std). According to our study, improving prophylactic ICD-implantation candidate selection by automatic classification from ECG features may be possible, but the availability of a sizable dataset appears to be essential to decrease the number of False Negatives.
[ { "created": "Thu, 16 Jan 2014 18:54:43 GMT", "version": "v1" } ]
2014-01-17
[ [ "Cappelaere", "Charles-Henri", "" ], [ "Dubois", "R.", "" ], [ "Roussel", "P.", "" ], [ "Dreyfus", "G.", "" ] ]
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1401.4130
Stefan Kiefer
R\'emi Bonnet and Stefan Kiefer and Anthony W. Lin
Analysis of Probabilistic Basic Parallel Processes
This is the technical report for a FoSSaCS'14 paper
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cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Basic Parallel Processes (BPPs) are a well-known subclass of Petri Nets. They are the simplest common model of concurrent programs that allows unbounded spawning of processes. In the probabilistic version of BPPs, every process generates other processes according to a probability distribution. We study the decidability and complexity of fundamental qualitative problems over probabilistic BPPs -- in particular reachability with probability 1 of different classes of target sets (e.g. upward-closed sets). Our results concern both the Markov-chain model, where processes are scheduled randomly, and the MDP model, where processes are picked by a scheduler.
[ { "created": "Thu, 16 Jan 2014 18:56:38 GMT", "version": "v1" } ]
2014-01-17
[ [ "Bonnet", "Rémi", "" ], [ "Kiefer", "Stefan", "" ], [ "Lin", "Anthony W.", "" ] ]
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1401.4134
Diogo Pratas
Diogo Pratas and Armando J. Pinho
A conditional compression distance that unveils insights of the genomic evolution
Full version of DCC 2014 paper "A conditional compression distance that unveils insights of the genomic evolution"
null
null
null
q-bio.GN cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a compression-based distance for genomic sequences. Instead of using the usual conjoint information content, as in the classical Normalized Compression Distance (NCD), it uses the conditional information content. To compute this Normalized Conditional Compression Distance (NCCD), we need a normal conditional compressor, that we built using a mixture of static and dynamic finite-context models. Using this approach, we measured chromosomal distances between Hominidae primates and also between Muroidea (rat and mouse), observing several insights of evolution that so far have not been reported in the literature.
[ { "created": "Thu, 16 Jan 2014 19:17:36 GMT", "version": "v1" } ]
2014-01-21
[ [ "Pratas", "Diogo", "" ], [ "Pinho", "Armando J.", "" ] ]
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1401.4140
Joachim Mathiesen
Joachim Mathiesen, Luiza Angheluta, Mogens H. Jensen
Statistics of co-occurring keywords on Twitter
13 pages, 8 figures
null
null
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Online social media such as the micro-blogging site Twitter has become a rich source of real-time data on online human behaviors. Here we analyze the occurrence and co-occurrence frequency of keywords in user posts on Twitter. From the occurrence rate of major international brand names, we provide examples on predictions of brand-user behaviors. From the co-occurrence rates, we further analyze the user-perceived relationships between international brand names and construct the corresponding relationship networks. In general the user activity on Twitter is highly intermittent and we show that the occurrence rate of brand names forms a highly correlated time signal.
[ { "created": "Thu, 16 Jan 2014 19:40:41 GMT", "version": "v1" } ]
2014-01-17
[ [ "Mathiesen", "Joachim", "" ], [ "Angheluta", "Luiza", "" ], [ "Jensen", "Mogens H.", "" ] ]
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1401.4143
Sunho Park
Sunho Park, TaeHyun Hwang, Seungjin Choi
Convex Optimization for Binary Classifier Aggregation in Multiclass Problems
Appeared in Proceedings of the 2014 SIAM International Conference on Data Mining (SDM 2014)
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null
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cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Multiclass problems are often decomposed into multiple binary problems that are solved by individual binary classifiers whose results are integrated into a final answer. Various methods, including all-pairs (APs), one-versus-all (OVA), and error correcting output code (ECOC), have been studied, to decompose multiclass problems into binary problems. However, little study has been made to optimally aggregate binary problems to determine a final answer to the multiclass problem. In this paper we present a convex optimization method for an optimal aggregation of binary classifiers to estimate class membership probabilities in multiclass problems. We model the class membership probability as a softmax function which takes a conic combination of discrepancies induced by individual binary classifiers, as an input. With this model, we formulate the regularized maximum likelihood estimation as a convex optimization problem, which is solved by the primal-dual interior point method. Connections of our method to large margin classifiers are presented, showing that the large margin formulation can be considered as a limiting case of our convex formulation. Numerical experiments on synthetic and real-world data sets demonstrate that our method outperforms existing aggregation methods as well as direct methods, in terms of the classification accuracy and the quality of class membership probability estimates.
[ { "created": "Thu, 16 Jan 2014 19:49:02 GMT", "version": "v1" } ]
2014-01-17
[ [ "Park", "Sunho", "" ], [ "Hwang", "TaeHyun", "" ], [ "Choi", "Seungjin", "" ] ]
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1401.4144
Yves Moinard
Philippe Besnard (INRIA - IRISA, IRIT), Marie-Odile Cordier (INRIA - IRISA, UR1), Yves Moinard (INRIA - IRISA)
Arguments using ontological and causal knowledge
null
JIAF 2013 (Septi\`emes Journ\'ees de l'Intelligence Artificielle Fondamentale) (2013) 41-48
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate an approach to reasoning about causes through argumentation. We consider a causal model for a physical system, and look for arguments about facts. Some arguments are meant to provide explanations of facts whereas some challenge these explanations and so on. At the root of argumentation here, are causal links ({A_1, ... ,A_n} causes B) and ontological links (o_1 is_a o_2). We present a system that provides a candidate explanation ({A_1, ... ,A_n} explains {B_1, ... ,B_m}) by resorting to an underlying causal link substantiated with appropriate ontological links. Argumentation is then at work from these various explaining links. A case study is developed: a severe storm Xynthia that devastated part of France in 2010, with an unaccountably high number of casualties.
[ { "created": "Thu, 16 Jan 2014 19:49:42 GMT", "version": "v1" } ]
2014-01-17
[ [ "Besnard", "Philippe", "", "INRIA - IRISA, IRIT" ], [ "Cordier", "Marie-Odile", "", "INRIA -\n IRISA, UR1" ], [ "Moinard", "Yves", "", "INRIA - IRISA" ] ]
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1401.4147
Sergiy Vorobyov A.
Mohammed F. A. Ahmed, Sergiy A. Vorobyov
Simple Semi-Distributed Lifetime Maximizing Strategy via Power Allocation in Collaborative Beamforming for Wireless Sensor Networks
27 pages, 11 figures, Finished in March 2011, Unpublished
null
null
null
cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Energy-efficient communication is an important issue in wireless sensor networks (WSNs) consisting of large number of energy-constrained sensor nodes. Indeed, sensor nodes have different energy budgets assigned to data transmission at individual nodes. Therefore, without energy-aware transmission schemes, energy can deplete from sensor nodes with smaller energy budget faster than from the rest of the sensor nodes in WSNs. This reduces the coverage area as well as the lifetime of WSNs. Collaborative beamforming (CB) has been proposed originally to achieve directional gain, however, it also inherently distributes the corresponding energy consumption over the collaborative sensor nodes. In fact, CB can be seen as a physical layer solution (versus the media access control/network layer solution) to balance the lifetimes of individual sensor nodes and extend the lifetime of the whole WSN. However, the introduction of energy-aware CB schemes is critical for extending the WSNs lifetime. In this paper, CB with power allocation (CB-PA) is developed to extend the lifetime of a cluster of collaborative sensor nodes by balancing the individual sensor node lifetimes. A novel strategy is proposed to utilize the residual energy information available at each sensor node. It adjusts the energy consumption rate at each sensor node while achieving the required average signal-to-noise ratio (SNR) at the destination. It is a semi-distributed strategy and it maintains average SNR. Different factors affecting the energy consumption are studied as well. Simulation results show that CB-PA outperforms CB with Equal Power Allocation (CB-EPA) in terms of extending the lifetime of a cluster of collaborative nodes.
[ { "created": "Thu, 16 Jan 2014 19:54:16 GMT", "version": "v1" } ]
2014-01-17
[ [ "Ahmed", "Mohammed F. A.", "" ], [ "Vorobyov", "Sergiy A.", "" ] ]
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1401.4151
Steve Schneider
Chris Culnane and Steve Schneider
A Peered Bulletin Board for Robust Use in Verifiable Voting Systems
49 pages
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Web Bulletin Board (WBB) is a key component of verifiable election systems. It is used in the context of election verification to publish evidence of voting and tallying that voters and officials can check, and where challenges can be launched in the event of malfeasance. In practice, the election authority has responsibility for implementing the web bulletin board correctly and reliably, and will wish to ensure that it behaves correctly even in the presence of failures and attacks. To ensure robustness, an implementation will typically use a number of peers to be able to provide a correct service even when some peers go down or behave dishonestly. In this paper we propose a new protocol to implement such a Web Bulletin Board, motivated by the needs of the vVote verifiable voting system. Using a distributed algorithm increases the complexity of the protocol and requires careful reasoning in order to establish correctness. Here we use the Event-B modelling and refinement approach to establish correctness of the peered design against an idealised specification of the bulletin board behaviour. In particular we show that for n peers, a threshold of t > 2n/3 peers behaving correctly is sufficient to ensure correct behaviour of the bulletin board distributed design. The algorithm also behaves correctly even if honest or dishonest peers temporarily drop out of the protocol and then return. The verification approach also establishes that the protocols used within the bulletin board do not interfere with each other. This is the first time a peered web bulletin board suite of protocols has been formally verified.
[ { "created": "Thu, 16 Jan 2014 20:11:42 GMT", "version": "v1" } ]
2014-01-17
[ [ "Culnane", "Chris", "" ], [ "Schneider", "Steve", "" ] ]
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1401.4156
Mark Saffman
J. Miao, J. Hostetter, G. Stratis, and M. Saffman
Magneto-Optical Trapping of Holmium Atoms
5 figures, v2: numerical values in Table I corrected, v3: metastable decay rate value revised, v4: minor changes and eq. (2) corrected for Holmium
Phys. Rev. A 89, 041401 (2014)
10.1103/PhysRevA.89.041401
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate sub-Doppler laser cooling and magneto-optical trapping of the rare earth element Holmium. Atoms are loaded from an atomic beam source and captured in six-beam $\sigma_+ - \sigma_-$ molasses using a strong $J=15/2 \leftrightarrow J=17/2$ cycling transition at $\lambda=410.5 \rm nm$. Due to the small difference in hyperfine splittings and Land\'e $g$-factors in the lower and upper levels of the cooling transition the MOT is self-repumped without additional repump light, and deep sub-Doppler cooling is achieved with the magnetic trap turned on. We measure the leakage out of the cycling transition to metastable states and find a branching ratio $\sim 10^{-5}$ which is adequate for state resolved measurements on hyperfine encoded qubits.
[ { "created": "Thu, 16 Jan 2014 20:39:16 GMT", "version": "v1" }, { "created": "Fri, 17 Jan 2014 20:06:34 GMT", "version": "v2" }, { "created": "Thu, 6 Feb 2014 20:39:56 GMT", "version": "v3" }, { "created": "Mon, 24 Mar 2014 15:58:30 GMT", "version": "v4" } ]
2016-07-26
[ [ "Miao", "J.", "" ], [ "Hostetter", "J.", "" ], [ "Stratis", "G.", "" ], [ "Saffman", "M.", "" ] ]
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1401.4158
Tom Froese
Tom Froese, Hiroyuki Iizuka and Takashi Ikegami
Embodied social interaction constitutes social cognition in pairs of humans: A minimalist virtual reality experiment
10 pages, 5 figures, 2 tables
Froese, T., Iizuka, H. & Ikegami, T. Embodied social interaction constitutes social cognition in pairs of humans: A minimalist virtual reality experiment. Sci. Rep. 4, 3672; DOI:10.1038/srep03672 (2014)
10.1038/srep03672
null
nlin.AO cs.HC cs.MA
http://creativecommons.org/licenses/by-nc-sa/3.0/
Scientists have traditionally limited the mechanisms of social cognition to one brain, but recent approaches claim that interaction also realizes cognitive work. Experiments under constrained virtual settings revealed that interaction dynamics implicitly guide social cognition. Here we show that embodied social interaction can be constitutive of agency detection and of experiencing another`s presence. Pairs of participants moved their "avatars" along an invisible virtual line and could make haptic contact with three identical objects, two of which embodied the other`s motions, but only one, the other`s avatar, also embodied the other`s contact sensor and thereby enabled responsive interaction. Co-regulated interactions were significantly correlated with identifications of the other`s avatar and reports of the clearest awareness of the other`s presence. These results challenge folk psychological notions about the boundaries of mind, but make sense from evolutionary and developmental perspectives: an extendible mind can offload cognitive work into its environment.
[ { "created": "Thu, 16 Jan 2014 20:42:32 GMT", "version": "v1" } ]
2014-01-17
[ [ "Froese", "Tom", "" ], [ "Iizuka", "Hiroyuki", "" ], [ "Ikegami", "Takashi", "" ] ]
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1401.4161
Mark Wilde
Bhaskar Roy Bardhan, Raul Garcia-Patron, Mark M. Wilde, and Andreas Winter
Strong converse for the classical capacity of optical quantum communication channels
15 pages, final version accepted into IEEE Transactions on Information Theory. arXiv admin note: text overlap with arXiv:1312.3287
IEEE Transactions on Information Theory, vol. 61, no. 4, pages 1842-1850, April 2015
10.1109/TIT.2015.2403840
null
quant-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish the classical capacity of optical quantum channels as a sharp transition between two regimes---one which is an error-free regime for communication rates below the capacity, and the other in which the probability of correctly decoding a classical message converges exponentially fast to zero if the communication rate exceeds the classical capacity. This result is obtained by proving a strong converse theorem for the classical capacity of all phase-insensitive bosonic Gaussian channels, a well-established model of optical quantum communication channels, such as lossy optical fibers, amplifier and free-space communication. The theorem holds under a particular photon-number occupation constraint, which we describe in detail in the paper. Our result bolsters the understanding of the classical capacity of these channels and opens the path to applications, such as proving the security of noisy quantum storage models of cryptography with optical links.
[ { "created": "Thu, 16 Jan 2014 20:49:19 GMT", "version": "v1" }, { "created": "Sun, 23 Mar 2014 01:34:14 GMT", "version": "v2" }, { "created": "Wed, 11 Feb 2015 00:21:52 GMT", "version": "v3" } ]
2015-03-17
[ [ "Bardhan", "Bhaskar Roy", "" ], [ "Garcia-Patron", "Raul", "" ], [ "Wilde", "Mark M.", "" ], [ "Winter", "Andreas", "" ] ]
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1401.4163
Patrick Blonigan
Patrick Blonigan, Steven Gomez, Qiqi Wang
Least Squares Shadowing for Sensitivity Analysis of Turbulent Fluid Flows
Presented at AIAA Scitech 2014
null
null
AIAA-2014-1426
physics.comp-ph math.DS nlin.CD physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Computational methods for sensitivity analysis are invaluable tools for aerodynamics research and engineering design. However, traditional sensitivity analysis methods break down when applied to long-time averaged quantities in turbulent fluid flow fields, specifically those obtained using high-fidelity turbulence simulations. This is because of a number of dynamical properties of turbulent and chaotic fluid flows, most importantly high sensitivity of the initial value problem, popularly known as the "butterfly effect". The recently developed least squares shadowing (LSS) method avoids the issues encountered by traditional sensitivity analysis methods by approximating the "shadow trajectory" in phase space, avoiding the high sensitivity of the initial value problem. The following paper discusses how the least squares problem associated with LSS is solved. Two methods are presented and are demonstrated on a simulation of homogeneous isotropic turbulence and the Kuramoto-Sivashinsky (KS) equation, a 4th order chaotic partial differential equation. We find that while LSS computes fairly accurate gradients, faster, more efficient linear solvers are needed to apply both LSS methods presented in this paper to larger simulations.
[ { "created": "Thu, 16 Jan 2014 20:51:48 GMT", "version": "v1" } ]
2014-01-17
[ [ "Blonigan", "Patrick", "" ], [ "Gomez", "Steven", "" ], [ "Wang", "Qiqi", "" ] ]
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1401.4165
Kevin Leung
Kevin Leung, Susan B. Rempe, Michael E. Foster, Yuguang Ma, Julibeth M. Martinez del la Hoz, Na Sai, and Perla B. Balbuena
Modeling Electrochemical Decomposition of Fluoroethylene Carbonate on Silicon Anode Surfaces in Lithium Ion Batteries
31 pages, 10 figures. We apologize for the poor quality of the composite figures, the result of being forced to use pdf formats for figures
Journal of the Electrochemical Society 161(1) A1-A9 (2014)
10.1149/2.092401jes
null
cond-mat.mtrl-sci cond-mat.soft physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fluoroethylene carbonate (FEC) shows promise as an electrolyte additive for improving passivating solid-electrolyte interphase (SEI) films on silicon anodes used in lithium ion batteries (LIB). We apply density functional theory (DFT), ab initio molecular dynamics (AIMD), and quantum chemistry techniques to examine excess-electron-induced FEC molecular decomposition mechanisms that lead to FEC-modified SEI. We consider one- and two-electron reactions using cluster models and explicit interfaces between liquid electrolyte and model Li(x)Si(y) surfaces, respectively. FEC is found to exhibit more varied reaction pathways than unsubstituted ethylene carbonate. The initial bond-breaking events and products of one- and two-electron reactions are qualitatively similar, with a fluoride ion detached in both cases. However, most one-electron products are charge-neutral, not anionic, and may not coalesce to form effective Li+-conducting SEI unless they are further reduced or take part in other reactions. The implications of these reactions to silicon-anode based LIB are discussed.
[ { "created": "Fri, 17 Jan 2014 00:33:54 GMT", "version": "v1" } ]
2014-01-20
[ [ "Leung", "Kevin", "" ], [ "Rempe", "Susan B.", "" ], [ "Foster", "Michael E.", "" ], [ "Ma", "Yuguang", "" ], [ "del la Hoz", "Julibeth M. Martinez", "" ], [ "Sai", "Na", "" ], [ "Balbuena", "Perla B.", "" ] ]
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1401.4166
Lianlin Li Dr
Lianlin Li, Fang Li, Tie Jun Cui
Far-field subwavelength imaging from a single broadband antenna in combined with strongly disordered medium
arXiv admin note: text overlap with arXiv:1401.3810
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The far-field subwavlength imaging is a challenging issue. In this letter we demonstrate numerically that the far-field subwavelength imaging of weakly scattering objects can be obtained by processing the data acquired by a single antenna, which benefits from the use of the strongly disordered medium. A mathematical model has been proposed for solving such problem based on the idea of sparse reconstruction. Moreover, this study leads to an important conclusion that the strongly disordered medium can serves as an efficient apparatus for the single-antenna compressive measurement, which shifts the complexity of devising compressive sensing (CS) hardware from the design, fabrication and electronic control. The proposed method and associated results can find applications in several imaging disciplines, such as optics, THz, RF or ultrasound imaging.
[ { "created": "Thu, 16 Jan 2014 02:07:48 GMT", "version": "v1" } ]
2014-01-20
[ [ "Li", "Lianlin", "" ], [ "Li", "Fang", "" ], [ "Cui", "Tie Jun", "" ] ]
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1401.4177
Andrey Beresnyak R
Andrey Beresnyak
Spectra of strong MHD Turbulence from high-resolution simulations
4 pages, 3 figures
null
10.1088/2041-8205/784/2/L20
null
astro-ph.GA physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Magnetohydrodynamic turbulence is a ubiquitous phenomenon in solar physics, plasma physics and astrophysics and governs many properties of the flows of well-conductive fluids. Recently, conflicting spectral slopes for the inertial range of MHD turbulence has been reported by different groups. Varying spectral shapes from earlier simulations hinted at a wider spectral locality of MHD, which necessitated higher resolution simulations and careful and rigorous numerical analysis. In this Letter we present two groups of simulations with resolution up to 4096^3 that are numerically well-resolved and has been analyzed with exact and well-tested method of scaling study. Our results from both simulation groups indicate that the power spectral slope for all energy-related quantities, such as total energy and residual energy are around -1.7, close to Kolmogorov's -5/3. This suggests that residual energy is the constant fraction, 0.15+-0.03 of the total energy and that in asymptotic regime magnetic and kinetic spectra have the same scaling. The -1.5 slope for energy and -2 slope for residual energy suggested by other groups seems to be completely inconsistent with numerics.
[ { "created": "Thu, 16 Jan 2014 21:01:48 GMT", "version": "v1" } ]
2015-06-18
[ [ "Beresnyak", "Andrey", "" ] ]
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1401.4184
Chi Xiong
Chi Xiong, Wolfram H. P. Pernice, Joseph H. Ngai, James W. Reiner, Divine Kumah, Frederick J. Walker, Charles H. Ahn and Hong X. Tang
Active silicon integrated nanophotonics: ferroelectric BaTiO3 devices
null
Nano Lett., 2014, 14 (3), pp 1419-1425
10.1021/nl404513p
null
cond-mat.mtrl-sci physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The integration of complex oxides on silicon presents opportunities to extend and enhance silicon technology with novel electronic, magnetic, and photonic properties. Among these materials, barium titanate (BaTiO3) is a particularly strong ferroelectric perovskite oxide with attractive dielectric and electro-optic properties. Here we demonstrate nanophotonic circuits incorporating ferroelectric BaTiO3 thin films on the ubiquitous silicon-on-insulator (SOI) platform. We grow epitaxial, single-crystalline BaTiO3 directly on SOI and engineer integrated waveguide structures that simultaneously confine light and an RF electric field in the BaTiO3 layer. Using on-chip photonic interferometers, we extract a large effective Pockels coefficient of 213 plus minus 49 pm/V, a value more than six times larger than found in commercial optical modulators based on lithium niobate. The monolithically integrated BaTiO3 optical modulators show modulation bandwidth in the gigahertz regime, which is promising for broadband applications.
[ { "created": "Thu, 16 Jan 2014 21:13:56 GMT", "version": "v1" }, { "created": "Tue, 4 Feb 2014 16:50:19 GMT", "version": "v2" } ]
2016-08-29
[ [ "Xiong", "Chi", "" ], [ "Pernice", "Wolfram H. P.", "" ], [ "Ngai", "Joseph H.", "" ], [ "Reiner", "James W.", "" ], [ "Kumah", "Divine", "" ], [ "Walker", "Frederick J.", "" ], [ "Ahn", "Charles H.", "" ], [ "Tang", "Hong X.", "" ] ]
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1401.4187
Michael Courtney
Elya R. Courtney and Michael W. Courtney
Gyroscopic Stability of Open Tipped Match Style Rifle Bullets
This article draws from arXiv:1309.5039 in the introduction, background, and experimental method. 8 pages, 5 figures
null
null
null
physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Earlier work has produced formulas for predicting stability of rifle bullets of near uniform density and also for plastic-tipped rifle bullets. These formulas have been shown to be accurate within 5%. However, the original Miller stability formula for metal bullets of near uniform density underestimates the stability of match style open tipped rifle bullets having a significant empty volume in the tip. This paper presents a new formula for accurately estimating the stability of these open tipped match style rifle bullets from parameters easily obtained such as the bullet mass, length, and depth of the empty space in the tip. The formula is tested by observations of whether bullets tumble and by measuring the aerodynamic drag vs. predicted stability of several bullets over a range of stabilities. In addition to confirmation in several test cases with original firing data, the new stability formula is validated by comparison with BRL spark range stability data for the 168 grain Sierra International in .308 to an accuracy of 2% for supersonic velocities (> M1.2).
[ { "created": "Thu, 16 Jan 2014 21:39:26 GMT", "version": "v1" }, { "created": "Thu, 16 Oct 2014 10:16:52 GMT", "version": "v2" } ]
2014-10-17
[ [ "Courtney", "Elya R.", "" ], [ "Courtney", "Michael W.", "" ] ]
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1401.4189
Jinfeng Du
Jinfeng Du, Muriel Medard, Ming Xiao and Mikael Skoglund
Scalable Capacity Bounding Models for Wireless Networks
Accepted for publication in IEEE Transactions on Information Theory
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The framework of network equivalence theory developed by Koetter et al. introduces a notion of channel emulation to construct noiseless networks as upper (resp. lower) bounding models, which can be used to calculate the outer (resp. inner) bounds for the capacity region of the original noisy network. Based on the network equivalence framework, this paper presents scalable upper and lower bounding models for wireless networks with potentially many nodes. A channel decoupling method is proposed to decompose wireless networks into decoupled multiple-access channels (MACs) and broadcast channels (BCs). The upper bounding model, consisting of only point-to-point bit pipes, is constructed by firstly extending the "one-shot" upper bounding models developed by Calmon et al. and then integrating them with network equivalence tools. The lower bounding model, consisting of both point-to-point and point-to-points bit pipes, is constructed based on a two-step update of the lower bounding models to incorporate the broadcast nature of wireless transmission. The main advantages of the proposed methods are their simplicity and the fact that they can be extended easily to large networks with a complexity that grows linearly with the number of nodes. It is demonstrated that the resulting upper and lower bounds can approach the capacity in some setups.
[ { "created": "Thu, 16 Jan 2014 21:58:17 GMT", "version": "v1" }, { "created": "Wed, 30 Sep 2015 17:57:13 GMT", "version": "v2" } ]
2015-10-01
[ [ "Du", "Jinfeng", "" ], [ "Medard", "Muriel", "" ], [ "Xiao", "Ming", "" ], [ "Skoglund", "Mikael", "" ] ]
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1401.4198
Aleksandar Donev
S. Delong and F. Balboa Usabiaga and R. Delgado-Buscalioni and B. E. Griffith and A. Donev
Brownian Dynamics without Green's Functions
For software see https://github.com/stochasticHydroTools/MixingIBAMR This version is updated relative to journal version with some fixes and an updated Figs. 1 and 4 and Table 1 to show latest boundary condition capabilities of the IBAMR code
J. Chem. Phys., 140, 134110, 2014
10.1063/1.4869866
null
cond-mat.soft physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a Fluctuating Immersed Boundary (FIB) method for performing Brownian dynamics simulations of confined particle suspensions. Unlike traditional methods which employ analytical Green's functions for Stokes flow in the confined geometry, the FIB method uses a fluctuating finite-volume Stokes solver to generate the action of the response functions "on the fly". Importantly, we demonstrate that both the deterministic terms necessary to capture the hydrodynamic interactions among the suspended particles, as well as the stochastic terms necessary to generate the hydrodynamically-correlated Brownian motion, can be generated by solving the steady Stokes equations numerically only once per time step. This is accomplished by including a stochastic contribution to the stress tensor in the fluid equations consistent with fluctuating hydrodynamics. We develop novel temporal integrators that account for the multiplicative nature of the noise in the equations of Brownian dynamics and the strong dependence of the mobility on the configuration for confined systems. Notably, we propose a random finite difference approach to approximating the stochastic drift proportional to the divergence of the configuration-dependent mobility matrix. Through comparisons with analytical and existing computational results, we numerically demonstrate the ability of the FIB method to accurately capture both the static (equilibrium) and dynamic properties of interacting particles in flow.
[ { "created": "Thu, 16 Jan 2014 23:32:25 GMT", "version": "v1" }, { "created": "Thu, 13 Mar 2014 19:17:33 GMT", "version": "v2" }, { "created": "Wed, 27 May 2015 18:33:54 GMT", "version": "v3" }, { "created": "Fri, 26 Jun 2015 18:53:38 GMT", "version": "v4" } ]
2015-06-29
[ [ "Delong", "S.", "" ], [ "Usabiaga", "F. Balboa", "" ], [ "Delgado-Buscalioni", "R.", "" ], [ "Griffith", "B. E.", "" ], [ "Donev", "A.", "" ] ]
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Brownian Dynamics without Green's Functions
http://arxiv.org/abs/1401.4198v4
http://arxiv.org/pdf/1401.4198v4.pdf
https://github.com/fbusabiaga/fluam
false
false
https://paperswithcode.com/paper/brownian-dynamics-without-greens-functions
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1401.4200
Yongxiang Huang
H.S. Tan, Y.X. Huang, and Jianping Meng
Hilbert Statistics of Vorticity Scaling in Two-Dimensional Turbulence
13 pages with 10 figures
Physics of Fluids, 26, 015106 (2014)
10.1063/1.4861068
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, the scaling property of the inverse energy cascade and forward enstrophy cascade of the vorticity filed $\omega(x,y)$ in two-dimensional (2D) turbulence is analyzed. This is accomplished by applying a Hilbert-based technique, namely Hilbert-Huang Transform, to a vorticity field obtained from a $8192^2$ grid-points direct numerical simulation of the 2D turbulence with a forcing scale $k_f=100$ and an Ekman friction. The measured joint probability density function $p(C,k)$ of mode $C_i(x)$ of the vorticity $\omega$ and instantaneous wavenumber $k(x)$ is separated by the forcing scale $k_f$ into two parts, which corresponding to the inverse energy cascade and the forward enstrophy cascade. It is found that all conditional pdf $p(C\vert k)$ at given wavenumber $k$ has an exponential tail. In the inverse energy cascade, the shape of $p(C\vert k)$ does collapse with each other, indicating a nonintermittent cascade. The measured scaling exponent $\zeta_{\omega}^I(q)$ is linear with the statistical order $q$, i.e., $\zeta_{\omega}^I(q)=-q/3$, confirming the nonintermittent cascade process. In the forward enstrophy cascade, the core part of $p(C\vert k)$ is changing with wavenumber $k$, indicating an intermittent forward cascade. The measured scaling exponent $\zeta_{\omega}^F(q)$ is nonlinear with $q$ and can be described very well by a log-Poisson fitting: $\zeta_{\omega}^F(q)=\frac{1}{3}q+0.45\left(1-0.43^{q}\right)$. However, the extracted vorticity scaling exponents $\zeta_{\omega}(q)$ for both inverse energy cascade and forward enstrophy cascade are not consistent with Kraichnan\rq{}s theory prediction. New theory for the vorticity field in 2D turbulence is required to interpret the observed scaling behavior.
[ { "created": "Thu, 16 Jan 2014 23:38:28 GMT", "version": "v1" } ]
2014-01-20
[ [ "Tan", "H. S.", "" ], [ "Huang", "Y. X.", "" ], [ "Meng", "Jianping", "" ] ]
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1401.4201
Yongxiang Huang
Y.X. Huang and Francois G. Schmitt
Time dependent intrinsic correlation analysis of temperature and dissolved oxygen time series using empirical mode decomposition
35 pages with 22 figures
Journal of Marine Systems 130 (2014): 90-100
10.1016/j.jmarsys.2013.06.007
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the marine environment, many fields have fluctuations over a large range of different spatial and temporal scales. These quantities can be nonlinear \red{and} non-stationary, and often interact with each other. A good method to study the multiple scale dynamics of such time series, and their correlations, is needed. In this paper an application of an empirical mode decomposition based time dependent intrinsic correlation, \red{of} two coastal oceanic time series, temperature and dissolved oxygen (saturation percentage) is presented. The two time series are recorded every 20 minutes \red{for} 7 years, from 2004 to 2011. The application of the Empirical Mode Decomposition on such time series is illustrated, and the power spectra of the time series are estimated using the Hilbert transform (Hilbert spectral analysis). Power-law regimes are found with slopes of 1.33 for dissolved oxygen and 1.68 for temperature at high frequencies (between 1.2 and 12 hours) \red{with} both close to 1.9 for lower frequencies (time scales from 2 to 100 days). Moreover, the time evolution and scale dependence of cross correlations between both series are considered. The trends are perfectly anti-correlated. The modes of mean year 3 and 1 year have also negative correlation, whereas higher frequency modes have a much smaller correlation. The estimation of time-dependent intrinsic correlations helps to show patterns of correlations at different scales, for different modes.
[ { "created": "Thu, 16 Jan 2014 23:50:18 GMT", "version": "v1" } ]
2014-01-20
[ [ "Huang", "Y. X.", "" ], [ "Schmitt", "Francois G.", "" ] ]
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1401.4203
Yongxiang Huang
Y.X. Huang and Francois G. Schmitt and Z.M. Lu and P. Fougairolles and Y. Gagne and Y.L. Liu
Second order structure function in fully developed turbulence
8 pages with 9 figures
Physical Review E 82, 026319 (2010)
10.1103/PhysRevE.82.026319
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We relate the second order structure function of a time series with the power spectrum of the original variable, taking an assumption of statistical stationarity. With this approach, we find that the structure function is strongly influenced by the large scales. The large scale contribution and the contribution range are respectively 79% and 1.4 decades for a Kolmogorov -5/3 power spectrum. We show numerically that a single scale influence range, over smaller scales is about 2 decades. We argue that the structure function is not a good method to extract the scaling exponents when the data possess large energetic scales. An alternative methodology, the arbitrary order Hilbert spectral analysis which may constrain this influence within 0.3 decade, is proposed to characterize the {scaling} property directly in an amplitude-frequency space. An analysis of passive scalar (temperature) turbulence time series is presented to show the influence of large scale structures in real turbulence, and the efficiency of the Hilbert-based methodology. The corresponding scaling exponents $\zeta_{\theta}(q)$ provided by the Hilbert-based approach indicate that the passive scalar turbulence field may be less intermittent than what was previously believed.
[ { "created": "Thu, 16 Jan 2014 23:58:33 GMT", "version": "v1" } ]
2014-01-20
[ [ "Huang", "Y. X.", "" ], [ "Schmitt", "Francois G.", "" ], [ "Lu", "Z. M.", "" ], [ "Fougairolles", "P.", "" ], [ "Gagne", "Y.", "" ], [ "Liu", "Y. L.", "" ] ]
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1401.4205
Maria Kalimeri
Maria Kalimeri, Vassilios Constantoudis, Constantinos Papadimitriou, Kostantinos Karamanos, Fotis K. Diakonos and Haris Papageorgiou
Entropy analysis of word-length series of natural language texts: Effects of text language and genre
9 pages, 7 figures
International Journal of Bifurcation and Chaos, 22, 1250223, (2012)
10.1142/S0218127412502239
null
cs.CL physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We estimate the $n$-gram entropies of natural language texts in word-length representation and find that these are sensitive to text language and genre. We attribute this sensitivity to changes in the probability distribution of the lengths of single words and emphasize the crucial role of the uniformity of probabilities of having words with length between five and ten. Furthermore, comparison with the entropies of shuffled data reveals the impact of word length correlations on the estimated $n$-gram entropies.
[ { "created": "Fri, 17 Jan 2014 00:00:32 GMT", "version": "v1" } ]
2014-01-20
[ [ "Kalimeri", "Maria", "" ], [ "Constantoudis", "Vassilios", "" ], [ "Papadimitriou", "Constantinos", "" ], [ "Karamanos", "Kostantinos", "" ], [ "Diakonos", "Fotis K.", "" ], [ "Papageorgiou", "Haris", "" ] ]
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1401.4207
Yongxiang Huang
Y.X. Huang and Francois G. Schmitt and Q. Zhou and X. Qiu and X.D. Shang and Z.M. Lu and and Y.L. Liu
Scaling of maximum probability density functions of velocity and temperature increments in turbulent systems
25 pages with 10 figures
Physics of Fluids, 23, 125101 (2011)
10.1063/1.3662439
null
physics.flu-dyn physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we introduce a new way to estimate the scaling parameter of a self-similar process by considering the maximum probability density function (pdf) of tis increments. We prove this for $H$-self-similar processes in general and experimentally investigate it for turbulent velocity and temperature increments. We consider turbulent velocity database from an experimental homogeneous and nearly isotropic turbulent channel flow, and temperature data set obtained near the sidewall of a Rayleigh-B\'{e}nard convection cell, where the turbulent flow is driven by buoyancy. For the former database, it is found that the maximum value of increment pdf $p_{\max}(\tau)$ is in a good agreement with lognormal distribution. We also obtain a scaling exponent $\alpha\simeq 0.37$, which is consistent with the scaling exponent for the first-order structure function reported in other studies. For the latter one, we obtain a scaling exponent $\alpha_{\theta}\simeq0.33$. This index value is consistent with the Kolmogorov-Obukhov-Corrsin scaling for passive scalar turbulence, but different from the scaling exponent of the first-order structure function that is found to be $\zeta_{\theta}(1)\simeq 0.19$, which is in favor of Bolgiano-Obukhov scaling. A possible explanation for these results is also given.
[ { "created": "Fri, 17 Jan 2014 00:12:05 GMT", "version": "v1" } ]
2014-02-05
[ [ "Huang", "Y. X.", "" ], [ "Schmitt", "Francois G.", "" ], [ "Zhou", "Q.", "" ], [ "Qiu", "X.", "" ], [ "Shang", "X. D.", "" ], [ "Lu", "Z. M.", "" ], [ "Liu", "and Y. L.", "" ] ]
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1401.4208
Joshua Spechler
John Cannarella and Joshua A. Spechler
Epidemiological modeling of online social network dynamics
11 pages, 4 figures, 2 tables
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The last decade has seen the rise of immense online social networks (OSNs) such as MySpace and Facebook. In this paper we use epidemiological models to explain user adoption and abandonment of OSNs, where adoption is analogous to infection and abandonment is analogous to recovery. We modify the traditional SIR model of disease spread by incorporating infectious recovery dynamics such that contact between a recovered and infected member of the population is required for recovery. The proposed infectious recovery SIR model (irSIR model) is validated using publicly available Google search query data for "MySpace" as a case study of an OSN that has exhibited both adoption and abandonment phases. The irSIR model is then applied to search query data for "Facebook," which is just beginning to show the onset of an abandonment phase. Extrapolating the best fit model into the future predicts a rapid decline in Facebook activity in the next few years.
[ { "created": "Fri, 17 Jan 2014 00:14:37 GMT", "version": "v1" } ]
2014-01-20
[ [ "Cannarella", "John", "" ], [ "Spechler", "Joshua A.", "" ] ]
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Epidemiological modeling of online social network dynamics
http://arxiv.org/abs/1401.4208v1
http://arxiv.org/pdf/1401.4208v1.pdf
https://github.com/hmatejx/slashdot-ai-hype
false
false
https://paperswithcode.com/paper/epidemiological-modeling-of-online-social
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1401.4210
Yongxiang Huang
Y.X. Huang and Francois G. Schmitt
Lagrangian Cascade in Three-Dimensional Homogeneous and Isotropic Turbulence
10 pages with 7 figures accepted for Journal of Fluid Mechanics as Rapids
null
10.1017/jfm.2014.1
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, the scaling statistics of the dissipation along Lagrangian trajectories are investigated by using fluid tracer particles obtained from a high resolution direct numerical simulation with $Re_{\lambda}=400$. Both the energy dissipation rate $\epsilon$ and the local time averaged $\epsilon_{\tau}$ agree rather well with the lognormal distribution hypothesis. Several statistics are then examined. It is found that the autocorrelation function $\rho(\tau)$ of $\ln(\epsilon(t))$ and variance $\sigma^2(\tau)$ of $\ln(\epsilon_{\tau}(t))$ obey a log-law with scaling exponent $\beta'=\beta=0.30$ compatible with the intermittency parameter $\mu=0.30$. The $q$th-order moment of $\epsilon_{\tau}$ has a clear power-law on the inertial range $10<\tau/\tau_{\eta}<100$. The measured scaling exponent $K_L(q)$ agrees remarkably with $q-\zeta_L(2q)$ where $\zeta_L(2q)$ is the scaling exponent estimated using the Hilbert methodology. All these results suggest that the dissipation along Lagrangian trajectories could be modelled by a multiplicative cascade.
[ { "created": "Fri, 17 Jan 2014 00:20:01 GMT", "version": "v1" } ]
2015-06-18
[ [ "Huang", "Y. X.", "" ], [ "Schmitt", "Francois G.", "" ] ]
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1401.4211
Yongxiang Huang
Y. X. Huang and Francois G. Schmitt and Z. M. Lu and Y. L. Liu
An amplitude-frequency study of turbulent scaling intermittency using Empirical Mode Decomposition and Hilbert Spectral Analysis
6 pages with 8 figures
Europhysics Letters 84 (2008) 40010
10.1209/0295-5075/84/40010
null
physics.flu-dyn physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hilbert-Huang transform is a method that has been introduced recently to decompose nonlinear, nonstationary time series into a sum of different modes, each one having a characteristic frequency. Here we show the first successful application of this approach to homogeneous turbulence time series. We associate each mode to dissipation, inertial range and integral scales. We then generalize this approach in order to characterize the scaling intermittency of turbulence in the inertial range, in an amplitude-frequency space. The new method is first validated using fractional Brownian motion simulations. We then obtain a 2D amplitude-frequency representation of the pdf of turbulent fluctuations with a scaling trend, and we show how multifractal exponents can be retrieved using this approach. We also find that the log-Poisson distribution fits the velocity amplitude pdf better than the lognormal distribution.
[ { "created": "Fri, 17 Jan 2014 00:32:39 GMT", "version": "v1" } ]
2014-02-05
[ [ "Huang", "Y. X.", "" ], [ "Schmitt", "Francois G.", "" ], [ "Lu", "Z. M.", "" ], [ "Liu", "Y. L.", "" ] ]
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1401.4213
Yongxiang Huang
Y.X. Huang and F. G. Schmitt and Z.M. Lu and Y.L. Liu
Autocorrelation function of velocity increments time series in fully developed turbulence
11 pages with 9 figures
Europhysics Letters 86 (2009) 40010
10.1209/0295-5075/86/40010
null
physics.flu-dyn physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In fully developed turbulence, the velocity field possesses long-range correlations, denoted by a scaling power spectrum or structure functions. Here we consider the autocorrelation function of velocity increment $ {\Delta u_{\ell}(t)}$ at separation {time} $\ell$. Anselmet et al. [Anselmet et al. J. Fluid Mech. \textbf{140}, 63 (1984)] have found that the autocorrelation function of velocity increment has a minimum value, whose location is approximately equal to $\ell$. Taking statistical stationary assumption, we link the velocity increment and the autocorrelation function with the power spectrum of the original variable. We then propose an analytical model of the autocorrelation function. With this model, we prove that the location of the minimum autocorrelation function is exactly equal to the separation {time} $\ell$ when the scaling of the power spectrum of the original variable belongs to the range $0<\beta<2$. This model also suggests a power law expression for the minimum autocorrelation. Considering the cumulative function of the autocorrelation function, it is shown that the main contribution to the autocorrelation function comes from the large scale part. Finally we argue that the autocorrelation function is a better indicator of the inertial range than the second order structure function.
[ { "created": "Fri, 17 Jan 2014 00:49:57 GMT", "version": "v1" } ]
2014-02-05
[ [ "Huang", "Y. X.", "" ], [ "Schmitt", "F. G.", "" ], [ "Lu", "Z. M.", "" ], [ "Liu", "Y. L.", "" ] ]
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1401.4216
Boris Karasik
Boris S. Karasik, Christopher B. McKitterick, Daniel E. Prober
Prospective performance of graphene HEB for ultrasensitive detection of sub-mm radiation
7 page, 1 figure, 15th International Workshop on Low Temperature Detectors (Pasadena, California, June 24-28, 2013)
J. Low Temp. Phys., Vol. 176, Issue 3-4, pp. 249-254, August 2014
10.1007/s10909-014-1087-7
null
physics.ins-det cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Noise Equivalent Power and time constant of a submillimeter wave Hot-Electron Bolometer (HEB) made from monolayer graphene are analyzed using the lowest electron-phonon thermal conductance data reported to date. Frequency-domain multiplexed Johnson Noise Thermometry (JNT) is used for the detector readout. Planar microantennas or waveguides can provide efficient coupling of the graphene microdevice to radiation. The results show that the graphene HEB detector can be radiation background limited at very low level corresponding to the photon noise on a space telescope with cryogenically cooled mirror. Beside the high sensitivity, absence of a hard power saturation limit, higher operating temperature, and the ability to read 1000s of elements with a single broadband amplifier will be the advantages of such a detector.
[ { "created": "Fri, 17 Jan 2014 01:27:29 GMT", "version": "v1" } ]
2014-11-17
[ [ "Karasik", "Boris S.", "" ], [ "McKitterick", "Christopher B.", "" ], [ "Prober", "Daniel E.", "" ] ]
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1401.4221
Yuan Xie
Yuan Xie and Wensheng Zhang and Dacheng Tao and Wenrui Hu and Yanyun Qu and Hanzi Wang
Distortion-driven Turbulence Effect Removal using Variational Model
28 pages, 15 figures
null
null
null
cs.CV
http://creativecommons.org/licenses/by/3.0/
It remains a challenge to simultaneously remove geometric distortion and space-time-varying blur in frames captured through a turbulent atmospheric medium. To solve, or at least reduce these effects, we propose a new scheme to recover a latent image from observed frames by integrating a new variational model and distortion-driven spatial-temporal kernel regression. The proposed scheme first constructs a high-quality reference image from the observed frames using low-rank decomposition. Then, to generate an improved registered sequence, the reference image is iteratively optimized using a variational model containing a new spatial-temporal regularization. The proposed fast algorithm efficiently solves this model without the use of partial differential equations (PDEs). Next, to reduce blur variation, distortion-driven spatial-temporal kernel regression is carried out to fuse the registered sequence into one image by introducing the concept of the near-stationary patch. Applying a blind deconvolution algorithm to the fused image produces the final output. Extensive experimental testing shows, both qualitatively and quantitatively, that the proposed method can effectively alleviate distortion and blur and recover details of the original scene compared to state-of-the-art methods.
[ { "created": "Fri, 17 Jan 2014 01:40:52 GMT", "version": "v1" } ]
2014-01-20
[ [ "Xie", "Yuan", "" ], [ "Zhang", "Wensheng", "" ], [ "Tao", "Dacheng", "" ], [ "Hu", "Wenrui", "" ], [ "Qu", "Yanyun", "" ], [ "Wang", "Hanzi", "" ] ]
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1401.4230
Mohammad Rasouli
Mohammad Rasouli and Demosthenis Teneketzis
Electricity Pooling Markets with Strategic Producers Possessing Asymmetric Information I: Elastic Demand
null
null
null
null
cs.GT cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the restructured electricity industry, electricity pooling markets are an oligopoly with strategic producers possessing private information (private production cost function). We focus on pooling markets where aggregate demand is represented by a non-strategic agent. We consider demand to be elastic. We propose a market mechanism that has the following features. (F1) It is individually rational. (F2) It is budget balanced. (F3) It is price efficient, that is, at equilibrium the price of electricity is equal to the marginal cost of production. (F4) The energy production profile corresponding to every non-zero Nash equilibrium of the game induced by the mechanism is a solution of the corresponding centralized problem where the objective is the maximization of the sum of the producers' and consumers' utilities. We identify some open problems associated with our approach to electricity pooling markets.
[ { "created": "Fri, 17 Jan 2014 03:13:53 GMT", "version": "v1" } ]
2014-01-20
[ [ "Rasouli", "Mohammad", "" ], [ "Teneketzis", "Demosthenis", "" ] ]
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1401.4234
Xiang Zuo
Xiang Zuo and Jeremy Blackburn and Nicolas Kourtellis and John Skvoretz and Adriana Iamnitchi
The power of indirect social ties
Technical Report
null
null
null
cs.SI physics.soc-ph
http://creativecommons.org/licenses/by/3.0/
While direct social ties have been intensely studied in the context of computer-mediated social networks, indirect ties (e.g., friends of friends) have seen little attention. Yet in real life, we often rely on friends of our friends for recommendations (of good doctors, good schools, or good babysitters), for introduction to a new job opportunity, and for many other occasional needs. In this work we attempt to 1) quantify the strength of indirect social ties, 2) validate it, and 3) empirically demonstrate its usefulness for distributed applications on two examples. We quantify social strength of indirect ties using a(ny) measure of the strength of the direct ties that connect two people and the intuition provided by the sociology literature. We validate the proposed metric experimentally by comparing correlations with other direct social tie evaluators. We show via data-driven experiments that the proposed metric for social strength can be used successfully for social applications. Specifically, we show that it alleviates known problems in friend-to-friend storage systems by addressing two previously documented shortcomings: reduced set of storage candidates and data availability correlations. We also show that it can be used for predicting the effects of a social diffusion with an accuracy of up to 93.5%.
[ { "created": "Fri, 17 Jan 2014 03:56:03 GMT", "version": "v1" } ]
2014-01-20
[ [ "Zuo", "Xiang", "" ], [ "Blackburn", "Jeremy", "" ], [ "Kourtellis", "Nicolas", "" ], [ "Skvoretz", "John", "" ], [ "Iamnitchi", "Adriana", "" ] ]
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1401.4235
Fei Xu
Fei Xu, Wei Luo, and Yan-qing Lu
Reconfigurable optical-force-drive chirp and delay-line in micro/nano-fiber Bragg grating
null
Physical Review A, 91, 053831(2015)
10.1103/PhysRevA.91.053831
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The emergence of optical micro/nano-fiber (MNF) with a subwavelength diameter, which has ultra-light mass and an intense light field, brings an opportunity for develop fiber based optomechanical systems. In this study, we theoretically show an optomechanical effect in silica MNF Bragg gratings (MNFBGs). The light-induced mechanical effect results in continuously distributed strain along the grating. It is shown that the power-related strain introduces an optically reconfigurable chirp in the grating period. We develop new optomechanical coupled-mode equations and theoretically analyze the influence of the optical-force-induced nonlinearity and chirp on the grating performance. Compared with weak Kerr effect, the optomechanics effect dominated in the properties evolution of MNFBGs and significant group velocity reduction and switching effect have been theoretically demonstrated at medium power level. This kind of optomechanical MNFBG with optically reconfigurable chirp may offer a path toward all-optical tunable bandwidth of Bragg resonance and may lead to useful applications such as all-optical switching and optically controlled dispersion and slow/fast light.
[ { "created": "Fri, 17 Jan 2014 04:28:35 GMT", "version": "v1" }, { "created": "Thu, 28 Aug 2014 09:45:55 GMT", "version": "v2" } ]
2015-09-30
[ [ "Xu", "Fei", "" ], [ "Luo", "Wei", "" ], [ "Lu", "Yan-qing", "" ] ]
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1401.4236
Stefano Rini
Stefano Rini and Shlomo Shamai (Shitz)
The Impact of Phase Fading on the Dirty Paper Channel
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The impact of phase fading on the classical Costa dirty paper coding channel is studied. We consider a variation of this channel model in which the amplitude of the interference sequence is known at the transmitter while its phase is known at the receiver. Although the capacity of this channel has already been established, it is expressed using an auxiliary random variable and as the solution of a maximization problem. To circumvent the difficulty evaluating capacity, we derive alternative inner and outer bounds and show that the two expressions are to within a finite distance. This provide an approximate characterization of the capacity which depends only on the channel parameters. We consider, in particular, two distributions of the phase fading: circular binomial and circular uniform. The first distribution models the scenario in which the transmitter has a minimal uncertainty over the phase of the interference while the second distribution models complete uncertainty. For circular binomial fading, we show that binning with Gaussian signaling still approaches capacity, as in the channel without phase fading. In the case of circular uniform fading, instead, binning with Gaussian signaling is no longer effective and novel interference avoidance strategies are developed to approach capacity.
[ { "created": "Fri, 17 Jan 2014 04:28:42 GMT", "version": "v1" } ]
2014-01-20
[ [ "Rini", "Stefano", "", "Shitz" ], [ "Shamai", "Shlomo", "", "Shitz" ] ]
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1401.4237
Saeed Bagheri
Saeed Bagheri and Anna Scaglione
The Cognitive Compressive Sensing Problem
8 pages, 2 figures
null
null
null
cs.IT math.IT math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the Cognitive Compressive Sensing (CCS) problem, a Cognitive Receiver (CR) seeks to optimize the reward obtained by sensing an underlying $N$ dimensional random vector, by collecting at most $K$ arbitrary projections of it. The $N$ components of the latent vector represent sub-channels states, that change dynamically from "busy" to "idle" and vice versa, as a Markov chain that is biased towards producing sparse vectors. To identify the optimal strategy we formulate the Multi-Armed Bandit Compressive Sensing (MAB-CS) problem, generalizing the popular Cognitive Spectrum Sensing model, in which the CR can sense $K$ out of the $N$ sub-channels, as well as the typical static setting of Compressive Sensing, in which the CR observes $K$ linear combinations of the $N$ dimensional sparse vector. The CR opportunistic choice of the sensing matrix should balance the desire of revealing the state of as many dimensions of the latent vector as possible, while not exceeding the limits beyond which the vector support is no longer uniquely identifiable.
[ { "created": "Fri, 17 Jan 2014 04:31:48 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 23:49:48 GMT", "version": "v2" } ]
2014-01-27
[ [ "Bagheri", "Saeed", "" ], [ "Scaglione", "Anna", "" ] ]
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1401.4241
Natanael Karjanto
N. Karjanto, W. Hanif, B. A. Malomed, H. Susanto
Interactions of bright and dark solitons with localized $\mathcal{PT}$-symmetric potentials
12 pages, 5 figures
Chaos 25, 023112, 2015
10.1063/1.4907556
null
nlin.PS physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study collisions of moving nonlinear-Schr\"{o}dinger solitons with a $\mathcal{PT}$-symmetric dipole embedded into the one-dimensional self-focusing or defocusing medium. Accurate analytical results are produced for bright solitons, and, in a more qualitative form, for dark ones. In the former case, an essential aspect of the approximation is that it must take into regard the intrinsic chirp of the soliton, thus going beyond the framework of the simplest quasi-particle description of the soliton's dynamics. Critical velocities separating reflection and transmission of the incident bright solitons are found by means of numerical simulations, and in the approximate semi-analytical form. An exact solution for the dark soliton pinned by the complex $\mathcal{PT}$-symmetric dipole is produced too.
[ { "created": "Fri, 17 Jan 2014 05:35:15 GMT", "version": "v1" }, { "created": "Tue, 5 Aug 2014 04:48:22 GMT", "version": "v2" }, { "created": "Wed, 2 Nov 2016 02:44:46 GMT", "version": "v3" } ]
2016-11-03
[ [ "Karjanto", "N.", "" ], [ "Hanif", "W.", "" ], [ "Malomed", "B. A.", "" ], [ "Susanto", "H.", "" ] ]
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1401.4245
Ekta Gupta
Ekta Gupta, Kalyani and Nitin
Preserving the Basic Property of Stable Matching by Deleting a pair
5 pages, 6 tables, 2 figures, International Conference in Distributed Computing & Internet Technology (ICDCIT-2014) http://www.ijcaonline.org/proceedings/icdcit2014/number1/14379-1303
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes the transition of a male-pessimal matching set to optimal when it is a man-oriented approach by deleting a pair from matching set considering the score based approach. A descriptive explanation of the proposed algorithm both in a sequential and parallel manner is given. The comparison based theoretical analysis shows that the best case of the algorithm is lower bound of n3.
[ { "created": "Fri, 17 Jan 2014 05:56:23 GMT", "version": "v1" } ]
2014-01-20
[ [ "Gupta", "Ekta", "" ], [ "Kalyani", "", "" ], [ "Nitin", "", "" ] ]
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1401.4248
Dae-Sung Jang
Dae-Sung Jang and Han-Lim Choi
Complexity Analysis of Heuristic Pulse Interleaving Algorithms for Multi-Target Tracking with Multiple Simultaneous Receive Beams
29 pages, 6 figures
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents heuristic algorithms for interleaved pulse scheduling problems on multi-target tracking in pulse Doppler phased array radars that can process multiple simultaneous received beams. The interleaved pulse scheduling problems for element and subarray level digital beamforming architectures are formulated as the same integer program and the asymptotic time complexities of the algorithms are analyzed.
[ { "created": "Fri, 17 Jan 2014 06:08:41 GMT", "version": "v1" }, { "created": "Fri, 5 Dec 2014 05:14:51 GMT", "version": "v2" } ]
2014-12-08
[ [ "Jang", "Dae-Sung", "" ], [ "Choi", "Han-Lim", "" ] ]
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1401.4251
Tadashi Wadyama
Tadashi Wadayama and Taisuke Izumi
Bitwise MAP Algorithm for Group Testing based on Holographic Transformation
6 pages, 5 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, an exact bitwise MAP (Maximum A Posteriori) estimation algorithm for group testing problems is presented. We assume a simplest non-adaptive group testing scenario including N-objects with binary status and M-disjunctive tests. If a group contains a positive object, the test result for the group is assumed to be one; otherwise, the test result becomes zero. Our inference problem is to evaluate the posterior probabilities of the objects from the observation of M-test results and from our knowledge on the prior probabilities for objects. The heart of the algorithm is the dual expression of the posterior values. The derivation of the dual expression can be naturally described based on a holographic transformation to the normal factor graph (NFG) representing the inference problem.
[ { "created": "Fri, 17 Jan 2014 06:35:15 GMT", "version": "v1" } ]
2014-01-20
[ [ "Wadayama", "Tadashi", "" ], [ "Izumi", "Taisuke", "" ] ]
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1401.4254
J\"urgen M\"unch
J\"urgen M\"unch
Goal-oriented Composition of Software Process Patterns
5 pages
Proceedings of the 6th International Workshop on Software Process Simulation and Modeling (ProSim 2005), pages 164-168, St. Louis, Missouri, USA, May 14-15 2005
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The development of high-quality software or software-intensive systems requires custom-tailored process models that fit the organizational and project goals as well as the development contexts. These models are a necessary prerequisite for creating project plans that are expected to fulfill business goals. Although project planners require individual process models custom-tailored to their constraints, software or system developing organizations also require generic processes (i.e., reference processes) that capture project-independent knowledge for similar development contexts. The latter is emphazised by assessment approaches (such as CMMI, SPICE) that require explicit process descriptions in order to reach a certain capability or maturity level. Among other concepts such as polymorphism, templates, or generator-based descriptions, software process patterns are used to describe generic process knowledge. Several approaches for describing the architecture of process patterns have already been published (e.g., [7]). However, there is a lack of descriptions on how to compose process patterns for a specific decelopment context in order to gain a custom-tailored process model for a project. This paper focuses on the composition of process patterns in a goal-oriented way. First, the paper describes which information a process pattern should contain so that it can be used for systematic composition. Second, a composition method is sketched. Afterwards, the results of a proof-of-concept evaluation of the method are described. Finally, the paper is summarized and open research questions are sketched.
[ { "created": "Fri, 17 Jan 2014 07:05:23 GMT", "version": "v1" } ]
2014-01-20
[ [ "Münch", "Jürgen", "" ] ]
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1401.4256
J\"urgen M\"unch
Jens Heidrich, Adam Trendowicz, J\"urgen M\"unch, Yasushi Ishigai, Kenji Yokoyama, Nahomi Kikuchi, T. Kawaguchi
Lessons Learned and Results from Applying Data-Driven Cost Estimation to Industrial Data Sets
10 pages. The final publication is available at http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=4335245
Proceedings of the 6th International Conference on the Quality of Information and Communications Technology (QUATIC 2007), pages 177-186, Lisbon New University, Lisbon, Portugal, September 12-14 2007
10.1109/QUATIC.2007.16
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The increasing availability of cost-relevant data in industry allows companies to apply data-intensive estimation methods. However, available data are often inconsistent, invalid, or incomplete, so that most of the existing data-intensive estimation methods cannot be applied. Only few estimation methods can deal with imperfect data to a certain extent (e.g., Optimized Set Reduction, OSR(c)). Results from evaluating these methods in practical environments are rare. This article describes a case study on the application of OSR(c) at Toshiba Information Systems (Japan) Corporation. An important result of the case study is that estimation accuracy significantly varies with the data sets used and the way of preprocessing these data. The study supports current results in the area of quantitative cost estimation and clearly illustrates typical problems. Experiences, lessons learned, and recommendations with respect to data preprocessing and data-intensive cost estimation in general are presented.
[ { "created": "Fri, 17 Jan 2014 07:13:37 GMT", "version": "v1" } ]
2014-01-20
[ [ "Heidrich", "Jens", "" ], [ "Trendowicz", "Adam", "" ], [ "Münch", "Jürgen", "" ], [ "Ishigai", "Yasushi", "" ], [ "Yokoyama", "Kenji", "" ], [ "Kikuchi", "Nahomi", "" ], [ "Kawaguchi", "T.", "" ] ]
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1401.4258
Shintaro Mori
Masato Hisakado and Shintaro Mori
Information cascade, Kirman's ant colony model, and kinetic Ising model
27 pages, 4 figures
Physica A417,2015,63-75
10.1016/j.physa.2014.09.008
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we discuss a voting model in which voters can obtain information from a finite number of previous voters. There exist three groups of voters: (i) digital herders and independent voters, (ii) analog herders and independent voters, and (iii) $\tanh$-type herders. In our previous paper [1], we used the mean field approximation for case (i). In that study, if the reference number $r$ is above three, phase transition occurs and the solution converges to one of the equilibria. However, the conclusion is different from mean field approximation. In this paper, we show that the solution oscillates between the two states. A good (bad) equilibrium is where a majority of $r$ select the correct (wrong) candidate. In this paper, we show that there is no phase transition when $r$ is finite. If the annealing schedule is adequately slow from finite $r$ to infinite $r$, the voting rate converges only to the good equilibrium. In case (ii), the state of reference votes is equivalent to that of Kirman's ant colony model, and it follows beta binomial distribution. In case (iii), we show that the model is equivalent to the finite-size kinetic Ising model. If the voters are rational, a simple herding experiment of information cascade is conducted. Information cascade results from the quenching of the kinetic Ising model.As case (i) is the limit of case (iii) when $\tanh$ function becomes a step function, the phase transition can be observed in infinite size limit. We can confirm that there is no phase transition when the reference number $r$ is finite.
[ { "created": "Fri, 17 Jan 2014 07:17:23 GMT", "version": "v1" }, { "created": "Tue, 7 Oct 2014 02:01:08 GMT", "version": "v2" } ]
2015-03-17
[ [ "Hisakado", "Masato", "" ], [ "Mori", "Shintaro", "" ] ]
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1401.4267
Naoki Masuda Dr.
Koji Oishi, Manuel Cebrian, Andres Abeliuk, Naoki Masuda
Iterated crowdsourcing dilemma game
4 figures, 4 tables
null
null
null
cs.GT physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Internet has enabled the emergence of collective problem solving, also known as crowdsourcing, as a viable option for solving complex tasks. However, the openness of crowdsourcing presents a challenge because solutions obtained by it can be sabotaged, stolen, and manipulated at a low cost for the attacker. We extend a previously proposed crowdsourcing dilemma game to an iterated game to address this question. We enumerate pure evolutionarily stable strategies within the class of so-called reactive strategies, i.e., those depending on the last action of the opponent. Among the 4096 possible reactive strategies, we find 16 strategies each of which is stable in some parameter regions. Repeated encounters of the players can improve social welfare when the damage inflicted by an attack and the cost of attack are both small. Under the current framework, repeated interactions do not really ameliorate the crowdsourcing dilemma in a majority of the parameter space.
[ { "created": "Fri, 17 Jan 2014 08:30:20 GMT", "version": "v1" } ]
2014-01-20
[ [ "Oishi", "Koji", "" ], [ "Cebrian", "Manuel", "" ], [ "Abeliuk", "Andres", "" ], [ "Masuda", "Naoki", "" ] ]
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1401.4269
Sheng Cai
Sheng Cai, Mayank Bakshi, Sidharth Jaggi, Minghua Chen
SUPER: Sparse signals with Unknown Phases Efficiently Recovered
19 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Suppose ${\bf x}$ is any exactly $k$-sparse vector in $\mathbb{C}^{n}$. We present a class of phase measurement matrix $A$ in $\mathbb{C}^{m\times n}$, and a corresponding algorithm, called SUPER, that can resolve ${\bf x}$ up to a global phase from intensity measurements $|A{\bf x}|$ with high probability over $A$. Here $|A{\bf x}|$ is a vector of component-wise magnitudes of $A{\bf x}$. The SUPER algorithm is the first to simultaneously have the following properties: (a) it requires only ${\cal O}(k)$ (order-optimal) measurements, (b) the computational complexity of decoding is ${\cal O}(k\log k)$ (near order-optimal) arithmetic operations.
[ { "created": "Fri, 17 Jan 2014 08:34:17 GMT", "version": "v1" }, { "created": "Tue, 21 Jan 2014 04:41:33 GMT", "version": "v2" }, { "created": "Sat, 25 Jan 2014 08:12:25 GMT", "version": "v3" } ]
2014-01-28
[ [ "Cai", "Sheng", "" ], [ "Bakshi", "Mayank", "" ], [ "Jaggi", "Sidharth", "" ], [ "Chen", "Minghua", "" ] ]
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1401.4270
Filippo Petroni
Marcel Ausloos and Filippo Petroni
Threshold Model for Triggered Avalanches on Networks
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null
null
null
physics.soc-ph nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on a theoretical model for opinion spreading on a network, through avalanches, the effect of external field is now considered, by using methods from non-equilibrium statistical mechanics. The original part contains the implementation that the avalanche is only triggered when a local variable (a so called awareness) reaches and goes above a threshold. The dynamical rules are constrained to be as simple as possible, in order to sort out the basic features, though more elaborated variants are proposed. Several results are obtained for a Erd\"os-R\'enyi network and interpreted through simple analytical laws, scale free or logistic map-like, i.e., (i) the sizes, durations, and number of avalanches, including the respective distributions, (ii) the number of times the external field is applied to one possible node before all nodes are found to be above the threshold, (iii) the number of nodes still below the threshold and the number of hot nodes (close to threshold) at each time step.
[ { "created": "Fri, 17 Jan 2014 08:48:41 GMT", "version": "v1" } ]
2014-01-20
[ [ "Ausloos", "Marcel", "" ], [ "Petroni", "Filippo", "" ] ]
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1401.4271
Giuseppe Toscani
Giuseppe Toscani
R\'enyi entropies and nonlinear diffusion equations
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math-ph cs.IT math.IT math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Since their introduction in the early sixties, the R\'enyi entropies have been used in many contexts, ranging from information theory to astrophysics, turbulence phenomena and others. In this note, we enlighten the main connections between R\'enyi entropies and nonlinear diffusion equations. In particular, it is shown that these relationships allow to prove various functional inequalities in sharp form.
[ { "created": "Fri, 17 Jan 2014 08:53:08 GMT", "version": "v1" } ]
2014-01-20
[ [ "Toscani", "Giuseppe", "" ] ]
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1401.4273
Anders Hansson
Michel Verhaegen and Anders Hansson
Nuclear Norm Subspace Identification (N2SID) for short data batches
Submitted to 2014 IFAC World Congress
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Subspace identification is revisited in the scope of nuclear norm minimization methods. It is shown that essential structural knowledge about the unknown data matrices in the data equation that relates Hankel matrices constructed from input and output data can be used in the first step of the numerical solution presented. The structural knowledge comprises the low rank property of a matrix that is the product of the extended observability matrix and the state sequence and the Toeplitz structure of the matrix of Markov parameters (of the system in innovation form). The new subspace identification method is referred to as the N2SID (twice the N of Nuclear Norm and SID for Subspace IDentification) method. In addition to include key structural knowledge in the solution it integrates the subspace calculation with minimization of a classical prediction error cost function. The nuclear norm relaxation enables us to perform such integration while preserving convexity. The advantages of N2SID are demonstrated in a numerical open- and closed-loop simulation study. Here a comparison is made with another widely used SID method, i.e. N4SID. The comparison focusses on the identification with short data batches, i.e. where the number of measurements is a small multiple of the system order.
[ { "created": "Fri, 17 Jan 2014 08:54:45 GMT", "version": "v1" } ]
2014-01-20
[ [ "Verhaegen", "Michel", "" ], [ "Hansson", "Anders", "" ] ]
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1401.4276
Xiaohui Wang
Xiaohui Wang, Jia Jia, Lianhong Cai, Jie Tang
Modeling Emotion Influence from Images in Social Networks
null
null
null
null
cs.SI cs.HC cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Images become an important and prevalent way to express users' activities, opinions and emotions. In a social network, individual emotions may be influenced by others, in particular by close friends. We focus on understanding how users embed emotions into the images they uploaded to the social websites and how social influence plays a role in changing users' emotions. We first verify the existence of emotion influence in the image networks, and then propose a probabilistic factor graph based emotion influence model to answer the questions of "who influences whom". Employing a real network from Flickr as experimental data, we study the effectiveness of factors in the proposed model with in-depth data analysis. Our experiments also show that our model, by incorporating the emotion influence, can significantly improve the accuracy (+5%) for predicting emotions from images. Finally, a case study is used as the anecdotal evidence to further demonstrate the effectiveness of the proposed model.
[ { "created": "Fri, 17 Jan 2014 09:16:25 GMT", "version": "v1" } ]
2014-01-20
[ [ "Wang", "Xiaohui", "" ], [ "Jia", "Jia", "" ], [ "Cai", "Lianhong", "" ], [ "Tang", "Jie", "" ] ]
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1401.4279
Iakov Lyashenko A.
Iakov A. Lyashenko, Nataliia N. Manko
Analysis of the stability of stationary boundary friction modes in the framework of a synergetic model
8 pages, 5 figures, 29 references
Ukrainian Journal of Physics, 2009, Vol. 54, no. 1-2, pp. 207-215 (www.ujp.bitp.kiev.ua)
null
null
cond-mat.mes-hall cond-mat.stat-mech nlin.CD physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A synergetic model describing the state of an ultrathin lubricant layer squeezed between two atomically smooth solid surfaces operating in the boundary friction mode has been developed further. To explain the presence of different operation modes of the system for various sets of its main parameters, the mathematical analysis of the synergetic model is carried out. The type of functioning a tribological system is described in accordance with the stability character of singular points, and the diagrams distinguishing various operation modes are obtained. Phase portraits corresponding to different stability types are plotted for all diagram areas. A stick-slip mode of motion that is often observed experimentally is described.
[ { "created": "Fri, 17 Jan 2014 09:27:44 GMT", "version": "v1" } ]
2014-01-20
[ [ "Lyashenko", "Iakov A.", "" ], [ "Manko", "Nataliia N.", "" ] ]
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1401.4282
J\"urgen M\"unch
Mart\'in Soto, Alexis Ocampo, J\"urgen M\"unch
The Secret Life of a Process Description: A Look into the Evolution of a Large Process Model
12 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F978-3-540-79588-9_23
Making Globally Distributed Software Development a Success Story, volume 5007 of Lecture Notes in Computer Science, pages 257-268, Springer Berlin Heidelberg, 2008
10.1007/978-3-540-79588-9_23
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Software process models must change continuously in order to remain consistent over time with the reality they represent, as well as relevant to the task they are intended for. Performing these changes in a sound and disci- plined fashion requires software process model evolution to be understood and controlled. The current situation can be characterized by a lack of understanding of software process model evolution and, in consequence, by a lack of systematic support for evolving software process models in organizations. This paper presents an analysis of the evolution of a large software process standard, namely, the process standard for the German Federal Government (V-Modell(R) XT). The analysis was performed with the Evolyzer tool suite, and is based on the complete history of over 600 versions that have been created during the development and maintenance of the standard. The analysis reveals similarities and differences between process evolution and empirical findings in the area of software system evolution. These findings provide hints on how to better manage process model evolution in the future.
[ { "created": "Fri, 17 Jan 2014 09:33:31 GMT", "version": "v1" } ]
2014-01-20
[ [ "Soto", "Martín", "" ], [ "Ocampo", "Alexis", "" ], [ "Münch", "Jürgen", "" ] ]
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1401.4285
Vadim Atrazhev V.
Arun Pandy, Zhiwei Yang, Mallika Gummalla, Vadim V. Atrazhev, Nikolay Yu. Kuzminyh, Vadim I. Sultanov, Sergei F. Burlatsky
A Carbon Corrosion Model to Evaluate the Effect of Steady State and Transient Operation of a Polymer Electrolyte Membrane Fuel Cell
null
Journal of The Electrochemical Society, 160 (9) F972-F979 (2013)
10.1149/2.036309jes
null
physics.chem-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A carbon corrosion model is developed based on the formation of surface oxides on carbon and platinum of the polymer electrolyte membrane fuel cell electrode. The model predicts the rate of carbon corrosion under potential hold and potential cycling conditions. The model includes the interaction of carbon surface oxides with transient species like OH radicals to explain observed carbon corrosion trends under normal PEM fuel cell operating conditions. The model prediction agrees qualitatively with the experimental data supporting the hypothesis that the interplay of surface oxide formation on carbon and platinum is the primary driver of carbon corrosion.
[ { "created": "Fri, 17 Jan 2014 09:42:44 GMT", "version": "v1" } ]
2014-01-20
[ [ "Pandy", "Arun", "" ], [ "Yang", "Zhiwei", "" ], [ "Gummalla", "Mallika", "" ], [ "Atrazhev", "Vadim V.", "" ], [ "Kuzminyh", "Nikolay Yu.", "" ], [ "Sultanov", "Vadim I.", "" ], [ "Burlatsky", "Sergei F.", "" ] ]
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1401.4286
Vadim Atrazhev V.
Vadim V. Atrazhev and Sergei F. Burlatsky
Modeling of durability of polyelectrolyte membrane of O2/H2 fuel cell
null
pp. 495-503 in Materials and processes for energy: communicating current research and technological developments, Formatex Research Center, 2013, ISBN (13): 978-84-939843-7-3
null
null
physics.chem-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we discuss critical aspects of the mechanisms and features of polymer proton exchange membrane (PEM) degradation in low-temperature H2/O2 fuel cell. In this paper, we focused on chemical mechanism of OH radical generation and their distribution in operational fuel cell. According to the current concept, free radicals are generated from hydrogen and oxygen crossover gases at the surface of Pt particles that precipitated in the membrane. We explicitly calculate Pt precipitation rate and electrochemical potential distribution in the membrane that controls it. Based on radical generation rate and Pt distribution we calculate degradation rate of the membrane taking advantage of simple kinetics equations.
[ { "created": "Fri, 17 Jan 2014 09:44:18 GMT", "version": "v1" } ]
2014-01-20
[ [ "Atrazhev", "Vadim V.", "" ], [ "Burlatsky", "Sergei F.", "" ] ]
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1401.4287
Vadim Atrazhev V.
Vadim V. Atrazhev, Tatiana Yu. Astakhova, Dmitry V. Dmitriev, Nikolay S. Erikhman, Vadim I. Sultanov, Timothy Patterson and Sergei F. Burlatsky
The model of stress distribution in polymer electrolyte membrane
null
Journal of The Electrochemical Society, 160 (10) F1129-F1137 (2013)
10.1149/2.079310jes
null
physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An analytical model of mechanical stress in a polymer electrolyte membrane (PEM) of a hydrogen/air fuel cell with porous Water Transfer Plates (WTP) is developed in this work. The model considers a mechanical stress in the membrane is a result of the cell load cycling under constant oxygen utilization. The load cycling causes the cycling of the inlet gas flow rate, which results in the membrane hydration/dehydration close to the gas inlet. Hydration/dehydration of the membrane leads to membrane swelling/shrinking, which causes mechanical stress in the constrained membrane. Mechanical stress results in through-plane crack formation. Thereby, the mechanical stress in the membrane causes mechanical failure of the membrane, limiting fuel cell lifetime. The model predicts the stress in the membrane as a function of the cell geometry, membrane material properties and operation conditions. The model was applied for stress calculation in GORE-SELECT.
[ { "created": "Fri, 17 Jan 2014 09:45:15 GMT", "version": "v1" } ]
2014-01-20
[ [ "Atrazhev", "Vadim V.", "" ], [ "Astakhova", "Tatiana Yu.", "" ], [ "Dmitriev", "Dmitry V.", "" ], [ "Erikhman", "Nikolay S.", "" ], [ "Sultanov", "Vadim I.", "" ], [ "Patterson", "Timothy", "" ], [ "Burlatsky", "Sergei F.", "" ] ]
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1401.4290
Armin Scrinzi
Mattia Lupetti, Julia Hengster, Thorsten Uphues, Armin Scrinzi
Attosecond Photoscopy of Plasmonic Excitations
Article + Supplementary Material
null
10.1103/PhysRevLett.113.113903
null
physics.optics physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an experimental arrangement to image, with attosecond resolution, transient surface plasmonic excitations. The required modifications to state-of-the-art setups used for attosecond streaking experiments from solid surfaces only involve available technology. Buildup and life times of surface plasmon polaritons can be extracted and local modulations of the exciting optical pulse can be diagnosed {\it in situ}.
[ { "created": "Fri, 17 Jan 2014 10:11:31 GMT", "version": "v1" }, { "created": "Fri, 1 Aug 2014 14:40:21 GMT", "version": "v2" } ]
2015-06-18
[ [ "Lupetti", "Mattia", "" ], [ "Hengster", "Julia", "" ], [ "Uphues", "Thorsten", "" ], [ "Scrinzi", "Armin", "" ] ]
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1401.4298
Sarah Becker
Sarah Becker, Rolando A. Rodriguez, Gorm B. Andresen, Martin O.W. Greiner, Stefan Schramm
What can transmission do for a fully renewable Europe?
Proceedings of the 8th SDEWES conference, Sep 2013, Dubrovnik
null
null
null
physics.soc-ph cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Our research is centred around the question how to best integrate the variable renewable energy sources (VRES), wind power and solar photovoltaics, into the European electricity grid. The future electricity supply will be based to a large extend on these fluctuating resources. We have conducted a study, extrapolating national historical and targeted wind and solar power penetrations in Europe up to 100% VRES (R.A. Rodriguez et al, Renewable Energy 63, p. 467, Mar 2014 and S. Becker et al, Energy 64, p. 404, Jan 2014). A high share of VRES means large fluctuations in the generation, causing overproduction and deficits. One way to reduce such mismatches is power transmission spatially smoothing out the fluctuations. This has the potential to reduce the remaining shortages by sharing the surplus production of others. We find that shortages can at maximum be reduced by 40% in the hypothetical case of unlimited transmission capacities across all of Europe. A more realistic extension of the transmission grid, roughly quadrupling today's installation, turns out to be sufficient to harvest 90% of this potential benefit. Finally, the import and export of single countries is investigated. We conclude that a country's load size as well as its position in the network are the determining factors for its import/export opportunities.
[ { "created": "Fri, 17 Jan 2014 10:38:52 GMT", "version": "v1" } ]
2014-02-12
[ [ "Becker", "Sarah", "" ], [ "Rodriguez", "Rolando A.", "" ], [ "Andresen", "Gorm B.", "" ], [ "Greiner", "Martin O. W.", "" ], [ "Schramm", "Stefan", "" ] ]
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1401.4304
Mikrajuddin Abdullah
Edy Wibowo, Sutisna, Mamat Rokhmat, Elfi Yuliza, Khairurrijal, and Mikrajuddin Abdullah
Theoretical and Experimental Studies on a Cylinder Containing Granules Rolling Down an Inclined Plane
35 pages, 18 figures
null
null
null
physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dynamics of a hollow cylinder containing granules and rolling down an inclined plane was investigated. A theoretical approach for investigating the behaviour of such a cylinder was proposed. The critical angle of the plane that allows the system to roll downward is presented. A simple experiment using six types of granules consistently confirmed the theoretical predictions. We showed that the critical angle is independent of the size distribution of the granules. We observed that the sliding angle of granules inside the cylinder is constant and, surprisingly, similar to the avalanche angle of the granules. Our theoretical prediction can be used to determine the critical angle without considering the shape, surface roughness and size distribution of the granules. Additionally, we derived the oscillation frequency of the system when it is slightly deviated from equilibrium, showing the frequency initially increases and then decreases with increasing granular volume. The oscillation is absent when the cylinder is empty or fully filled with granules. Furthermore, the dissipation of energy as a function of the fractional volume and fractional mass of the cylinder system were determined. This work might help students understand rolling motions other than the standard rolling motion commonly taught in the classroom.
[ { "created": "Fri, 17 Jan 2014 11:00:33 GMT", "version": "v1" } ]
2014-01-20
[ [ "Wibowo", "Edy", "" ], [ "Sutisna", "", "" ], [ "Rokhmat", "Mamat", "" ], [ "Yuliza", "Elfi", "" ], [ "Khairurrijal", "", "" ], [ "Abdullah", "Mikrajuddin", "" ] ]
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1401.4307
Khalid Belhajjame
Khalid Belhajjame and Jun Zhao and Daniel Garijo and Kristina Hettne and Raul Palma and \'Oscar Corcho and Jos\'e-Manuel G\'omez-P\'erez and Sean Bechhofer and Graham Klyne and Carole Goble
The Research Object Suite of Ontologies: Sharing and Exchanging Research Data and Methods on the Open Web
20 pages
null
null
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Research in life sciences is increasingly being conducted in a digital and online environment. In particular, life scientists have been pioneers in embracing new computational tools to conduct their investigations. To support the sharing of digital objects produced during such research investigations, we have witnessed in the last few years the emergence of specialized repositories, e.g., DataVerse and FigShare. Such repositories provide users with the means to share and publish datasets that were used or generated in research investigations. While these repositories have proven their usefulness, interpreting and reusing evidence for most research results is a challenging task. Additional contextual descriptions are needed to understand how those results were generated and/or the circumstances under which they were concluded. Because of this, scientists are calling for models that go beyond the publication of datasets to systematically capture the life cycle of scientific investigations and provide a single entry point to access the information about the hypothesis investigated, the datasets used, the experiments carried out, the results of the experiments, the people involved in the research, etc. In this paper we present the Research Object (RO) suite of ontologies, which provide a structured container to encapsulate research data and methods along with essential metadata descriptions. Research Objects are portable units that enable the sharing, preservation, interpretation and reuse of research investigation results. The ontologies we present have been designed in the light of requirements that we gathered from life scientists. They have been built upon existing popular vocabularies to facilitate interoperability. Furthermore, we have developed tools to support the creation and sharing of Research Objects, thereby promoting and facilitating their adoption.
[ { "created": "Fri, 17 Jan 2014 11:07:52 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 10:27:19 GMT", "version": "v2" } ]
2014-02-04
[ [ "Belhajjame", "Khalid", "" ], [ "Zhao", "Jun", "" ], [ "Garijo", "Daniel", "" ], [ "Hettne", "Kristina", "" ], [ "Palma", "Raul", "" ], [ "Corcho", "Óscar", "" ], [ "Gómez-Pérez", "José-Manuel", "" ], [ "Bechhofer", "Sean", "" ], [ "Klyne", "Graham", "" ], [ "Goble", "Carole", "" ] ]
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1401.4312
Jun Fang
Jun Fang, Jing Li, Yanning Shen, Hongbin Li (Senior Member, IEEE), and Shaoqian Li
Super-Resolution Compressed Sensing: An Iterative Reweighted Algorithm for Joint Parameter Learning and Sparse Signal Recovery
null
null
10.1109/LSP.2014.2316004
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In many practical applications such as direction-of-arrival (DOA) estimation and line spectral estimation, the sparsifying dictionary is usually characterized by a set of unknown parameters in a continuous domain. To apply the conventional compressed sensing to such applications, the continuous parameter space has to be discretized to a finite set of grid points. Discretization, however, incurs errors and leads to deteriorated recovery performance. To address this issue, we propose an iterative reweighted method which jointly estimates the unknown parameters and the sparse signals. Specifically, the proposed algorithm is developed by iteratively decreasing a surrogate function majorizing a given objective function, which results in a gradual and interweaved iterative process to refine the unknown parameters and the sparse signal. Numerical results show that the algorithm provides superior performance in resolving closely-spaced frequency components.
[ { "created": "Fri, 17 Jan 2014 11:31:10 GMT", "version": "v1" } ]
2015-06-18
[ [ "Fang", "Jun", "", "Senior Member, IEEE" ], [ "Li", "Jing", "", "Senior Member, IEEE" ], [ "Shen", "Yanning", "", "Senior Member, IEEE" ], [ "Li", "Hongbin", "", "Senior Member, IEEE" ], [ "Li", "Shaoqian", "" ] ]
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1401.4313
Francesca Bassi
Wenjie Li and Francesca Bassi and Michel Kieffer
Robust Bayesian compressed sensing over finite fields: asymptotic performance analysis
42 pages, 4 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper addresses the topic of robust Bayesian compressed sensing over finite fields. For stationary and ergodic sources, it provides asymptotic (with the size of the vector to estimate) necessary and sufficient conditions on the number of required measurements to achieve vanishing reconstruction error, in presence of sensing and communication noise. In all considered cases, the necessary and sufficient conditions asymptotically coincide. Conditions on the sparsity of the sensing matrix are established in presence of communication noise. Several previously published results are generalized and extended.
[ { "created": "Fri, 17 Jan 2014 11:34:02 GMT", "version": "v1" } ]
2014-01-20
[ [ "Li", "Wenjie", "" ], [ "Bassi", "Francesca", "" ], [ "Kieffer", "Michel", "" ] ]
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1401.4315
Ali Mostafazadeh
Ali Mostafazadeh
Adiabatic Approximation, Semiclassical Scattering, and Unidirectional Invisibility
15 pages, 1 figure, 1 table, expanded version to appear in J. Phys. A
J. Phys. A: Math. Theor. 47, 125301 (2014)
10.1088/1751-8113/47/12/125301
null
quant-ph math-ph math.MP physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The transfer matrix of a possibly complex and energy-dependent scattering potential can be identified with the $S$-matrix of a two-level time-dependent non-Hermitian Hamiltonian H(t). We show that the application of the adiabatic approximation to H(t) corresponds to the semiclassical description of the original scattering problem. In particular, the geometric part of the phase of the evolving eigenvectors of H(t) gives the pre-exponential factor of the WKB wave functions. We use these observations to give an explicit semiclassical expression for the transfer matrix. This allows for a detailed study of the semiclassical unidirectional reflectionlessness and invisibility. We examine concrete realizations of the latter in the realm of optics.
[ { "created": "Fri, 17 Jan 2014 11:58:41 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 15:09:18 GMT", "version": "v2" }, { "created": "Thu, 27 Feb 2014 11:47:28 GMT", "version": "v3" } ]
2014-05-20
[ [ "Mostafazadeh", "Ali", "" ] ]
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