Preview: Recent Articles in Phys. Rev. E
Recent Articles in Phys. Rev. ERecent articles in Physical Review EPublished: 2012-02-10T16:06:15-05:00
Phase transitions in crowd dynamics of resource allocation 2012-02-10T10:00:00-05:00 Author(s): Asim Ghosh, Daniele De Martino, Arnab Chatterjee, Matteo Marsili, and Bikas K. ChakrabartiWe define and study a class of resource allocation processes where gN agents, by repeatedly visiting N resources, try to converge to an optimal configuration where each resource is occupied by at most one agent. The process exhibits a phase transition, as the density g of agents grows, from an absor... [Phys. Rev. E 85, 021116] Published Fri Feb 10, 2012
Quantum statistics and thermodynamics in the harmonic approximation 2012-02-10T10:00:00-05:00 Author(s): J. R. Armstrong, N. T. Zinner, D. V. Fedorov, and A. S. JensenWe describe a method to compute thermodynamic quantities in the harmonic approximation for identical bosons and fermions in an external confining field. We use the canonical partition function where only energies and their degeneracies enter. The number of states of given energy and symmetry is foun... [Phys. Rev. E 85, 021117] Published Fri Feb 10, 2012
Direct visualization of three-dimensional crystallization behavior in microgels 2012-02-10T10:00:00-05:00 Author(s): Melaku Muluneh and David A. WeitzWe use confocal microscopy to study the three-dimensional (3D) structure of colloidal crystals formed by poly(N-isopropylacrylamide)-co-(acrylic acid) microgels of diameter 1.0–1.5 μm. The confocal images are tracked to locate particle positions in 3D, which are used to compute pair-correlation func... [Phys. Rev. E 85, 021405] Published Fri Feb 10, 2012
Slow knot formation by suppressed self-reptation in a collapsed polymer chain 2012-02-10T10:00:00-05:00 Author(s): Mitsuo Nakata, Yoshiki Nakamura, Naoki Sasaki, and Yasuyuki MakiChain-expansion processes from knotted globules have been measured for poly(methyl methacrylate) (PMMA) in the mixed solvent tert-butyl alcohol (TBA) + water (2.5 vol %) by static light scattering. The solution was quenched from the Θ temperature of 41.5 ∘C to 37.0 ∘C, aged there for a time period t... [Phys. Rev. E 85, 021802] Published Fri Feb 10, 2012
Modified permutation-entropy analysis of heartbeat dynamics 2012-02-10T10:00:00-05:00 Author(s): Chunhua Bian, Chang Qin, Qianli D. Y. Ma, and Qinghong ShenHeart rate variability (HRV) contains important information about the modulation of the cardiovascular system. Various methods of nonlinear dynamics (e.g., estimating Lyapunov exponents) and complexity measures (e.g., correlation dimension or entropies) have been applied to HRV analysis. Permutation... [Phys. Rev. E 85, 021906] Published Fri Feb 10, 2012
Thermocapillary migration in small-scale temperature gradients: Application to optofluidic drop dispensing 2012-02-10T10:00:00-05:00 Author(s): Matthieu Robert de Saint Vincent and Jean-Pierre DelvilleWe experimentally investigate the thermocapillary migration induced by local laser heating of the advancing front of a growing droplet confined in a microfluidic channel. When heating implies an effective increase in interfacial tension, the laser behaves as a “soft door” whose stiffness can be tune... [Phys. Rev. E 85, 026310] Published Fri Feb 10, 2012
Fluctuating hydrodynamics and turbulence in a rotating fluid: Universal properties 2012-02-10T10:00:00-05:00 Author(s): Abhik Basu and Jayanta K. BhattacharjeeWe analyze the statistical properties of three-dimensional (3D) turbulence in a rotating fluid. To this end we introduce a generating functional to study the statistical properties of the velocity field v. We obtain the master equation from the Navier-Stokes equation in a rotating frame and thence a... [Phys. Rev. E 85, 026311] Published Fri Feb 10, 2012
Continuous universality in nonequilibrium relaxational dynamics of O(2) symmetric systems 2012-02-09T10:00:00-05:00 Author(s): Niladri Sarkar and Abhik BasuWe elucidate a nonconserved relaxational nonequilibrium dynamics of a O(2) symmetric model. We drive the system out of equilibrium by introducing a nonzero noise cross correlation of amplitude D× in a stochastic Langevin description of the system, while maintaining the O(2) symmetry of the order par... [Phys. Rev. E 85, 021113] Published Thu Feb 09, 2012
Phase transitions in two-dimensional Z(N) vector models for N>4 2012-02-09T10:00:00-05:00 Author(s): O. Borisenko, V. Chelnokov, G. Cortese, R. Fiore, M. Gravina, and A. PapaWe investigate both analytically and numerically the renormalization group equations in two-dimensional (2D) Z(N) vector models. The position of the critical points of the two phase transitions for N>4 is established and the critical index ν is computed. For N=7 and 17 the critical points are loc... [Phys. Rev. E 85, 021114] Published Thu Feb 09, 2012
Critical behavior of a three-dimensional hardcore-cylinder composite system 2012-02-09T10:00:00-05:00 Author(s): Jaime Silva, Ricardo Simoes, and Senentxu Lanceros-MendezIn this work the critical indices β, γ, and ν for a three-dimensional (3D) hardcore cylinder composite system with short-range interaction have been obtained. In contrast to the 2D stick system and the 3D hardcore cylinder system, the determined critical exponents do not belong to the same universal... [Phys. Rev. E 85, 021115] Published Thu Feb 09, 2012
Iterative solution of integral equations on a basis of positive energy Sturmian functions 2012-02-09T10:00:00-05:00 Author(s): George RawitscherAn improvement of Weinberg's quasiparticle method for solving general one-dimensional integral equations is presented. The method uses simple auxiliary Sturmian functions for positive or negative energies, and corrects iteratively for the truncation errors of the Sturmian expansion of the solution. ... [Phys. Rev. E 85, 026701] Published Thu Feb 09, 2012
Generalization of the Einstein relation for single trajectories in deterministic subdiffusion 2012-02-08T10:00:00-05:00 Author(s): Takuma AkimotoDiffusion coefficients are intrinsically random in subdiffusion attributable to power-law trapping. Using deterministic biased and unbiased diffusion models, we investigate the Einstein relation for single trajectories in subdiffusion. The difference in the generalized Lyapunov exponent between bias... (image) [Phys. Rev. E 85, 021110] Published Wed Feb 08, 2012
Cooperative behavior in evolutionary snowdrift games with the unconditional imitation rule on regular lattices 2012-02-08T10:00:00-05:00 Author(s): Ping-Ping Li, Jianhong Ke, Zhenquan Lin, and P. M. HuiWe study an evolutionary snowdrift game with the unconditional imitation updating rule on regular lattices. Detailed numerical simulations establish the structure of plateaus and discontinuous jumps of the equilibrium cooperation frequency fc as a function of the cost-to-benefit ratio r. By analyzin... [Phys. Rev. E 85, 021111] Published Wed Feb 08, 2012
Quantifying reversibility in a phase-separating lattice gas: An analogy with self-assembly 2012-02-08T10:00:00-05:00 Author(s): James Grant and Robert L. JackWe present dynamic measurements of a lattice gas during phase separation, which we use as an analogy for self-assembly of equilibrium ordered structures. We use two approaches to quantify the degree of reversibility of this process: First, we count events in which bonds are made and broken; second, ... [Phys. Rev. E 85, 021112] Published Wed Feb 08, 2012
Evolution of pressure profiles during the discharge of a silo 2012-02-08T10:00:00-05:00 Author(s): Christophe Perge, María Alejandra Aguirre, Paula Alejandra Gago, Luis A. Pugnaloni, Denis Le Tourneau, and Jean-Christophe GéminardWe report measurements of the pressure profile in the outlet plane of a discharging silo. We observe that, whatever the preparation of the granular system, a dynamic Janssen effect is at play: the apparent mass of the grains (i.e., the part of their mass sustained by the base) is significantly small... [Phys. Rev. E 85, 021303] Published Wed Feb 08, 2012
Nonlinear effective-medium theory of disordered spring networks 2012-02-08T10:00:00-05:00 Author(s): M. Sheinman, C. P. Broedersz, and F. C. MacKintoshDisordered soft materials, such as fibrous networks in biological contexts, exhibit a nonlinear elastic response. We study such nonlinear behavior with a minimal model for networks on lattice geometries with simple Hookian elements with disordered spring constant. By developing a mean-field approach... [Phys. Rev. E 85, 021801] Published Wed Feb 08, 2012
Minimalistic behavioral rule derived from bacterial chemotaxis in a stochastic resonance setup 2012-02-08T10:00:00-05:00 Author(s): Shuhei Ikemoto, Fabio DallaLibera, Koh Hosoda, and Hiroshi IshiguroAnimals are able to cope with the noise, uncertainties, and complexity of the real world. Often even elementary living beings, equipped with very limited sensory organs, are able to reach regions favorable to their existence, using simple stochastic policies. In this paper we discuss a minimalistic ... [Phys. Rev. E 85, 021905] Published Wed Feb 08, 2012
Pseudocompressible approximation and statistical turbulence modeling: Application to shock tube flows 2012-02-08T10:00:00-05:00 Author(s): Olivier Soulard, Jérôme Griffond, and Denis SoufflandIn this work, a pseudocompressible approximation relevant for turbulent mixing flows encountered in shock tubes is derived. The asymptotic analysis used for this purpose puts forward the role played by four dimensionless numbers on the flow compressibility, namely, the turbulent, deformation, strati... [Phys. Rev. E 85, 026307] Published Wed Feb 08, 2012
Direct numerical simulation of two-dimensional wall-bounded turbulent flows from receptivity stage 2012-02-08T10:00:00-05:00 Author(s): T. K. Sengupta, S. Bhaumik, and Y. G. BhumkarDeterministic route to turbulence creation in 2D wall boundary layer is shown here by solving full Navier-Stokes equation by dispersion relation preserving (DRP) numerical methods for flow over a flat plate excited by wall and free stream excitations. Present results show the transition caused by wa... [Phys. Rev. E 85, 026308] Published Wed Feb 08, 2012
Immiscible displacement of oil by water in a microchannel: Asymmetric flow behavior and nonlinear stability analysis of core-annular flow 2012-02-08T10:00:00-05:00 Author(s): Hooman Foroughi, Alireza Abbasi, Kausik S. Das, and Masahiro KawajiThe immiscible displacement of oil by water in a circular microchannel was investigated. A fused silica microchannel with an inner diameter of 250 μm and a length of 7 cm was initially filled with a viscous silicone oil. Only water then was injected into the channel. We describe our flow observation... [Phys. Rev. E 85, 026309] Published Wed Feb 08, 2012
Stochastic tipping points in climate dynamics 2012-02-08T10:00:00-05:00 Author(s): Stefano PieriniA crucial question recently raised in climate dynamics concerns abrupt climate transitions: Are they due to a tipping point (TP) being exceeded, or is fast noisy dynamics the cause of their excitation? In this respect, a case study based on a low-order ocean model is developed to show that in an exc... [Phys. Rev. E 85, 027101] Published Wed Feb 08, 2012
Heat and work fluctuations for a harmonic oscillator 2012-02-07T10:00:00-05:00 Author(s): Sanjib SabhapanditThe formalism of Kundu et al. [ J. Stat. Mech. P03007 (2011)], for computing the large deviations of heat flow in harmonic systems, is applied to the case of single Brownian particle in a harmonic trap and coupled to two heat baths at different temperatures. The large-τ form of the moment generati... [Phys. Rev. E 85, 021108] Published Tue Feb 07, 2012
Threshold of hierarchical percolating systems 2012-02-07T10:00:00-05:00 Author(s): Jiantong Li, Biswajit Ray, Muhammad A. Alam, and Mikael ÖstlingMany modern nanostructured materials and doped polymers are morphologically too complex to be interpreted by classical percolation theory. Here, we develop the concept of a hierarchical percolating (percolation-within-percolation) system to describe such complex materials and illustrate how to gener... [Phys. Rev. E 85, 021109] Published Tue Feb 07, 2012
Unsteady non-Newtonian hydrodynamics in granular gases 2012-02-07T10:00:00-05:00 Author(s): Antonio Astillero and Andrés SantosThe temporal evolution of a dilute granular gas, both in a compressible flow (uniform longitudinal flow) and in an incompressible flow (uniform shear flow), is investigated by means of the direct simulation Monte Carlo method to solve the Boltzmann equation. Emphasis is laid on the identification of... [Phys. Rev. E 85, 021302] Published Tue Feb 07, 2012
Stability and minimum size of colloidal clusters on a liquid-air interface 2012-02-07T10:00:00-05:00 Author(s): V. M. PergamenshchikA vertical force applied to each of two colloids, trapped at a liquid-air interface, induces their logarithmic pairwise attraction. I recently showed [ Phys. Rev. E 79 011407 (2009)] that in clusters of size R much larger than the capillary length λ, the attraction changes to that of a power law an... [Phys. Rev. E 85, 021403] Published Tue Feb 07, 2012
Sudden collapse of a colloidal gel 2012-02-07T10:00:00-05:00 Author(s): Paul Bartlett, Lisa J. Teece, and Malcolm A. FaersMetastable gels formed by weakly attractive colloidal particles display a distinctive two-stage time-dependent settling behavior under their own weight. Initially, a space-spanning network is formed that, for a characteristic time, which we define as the lag time τd, resists compaction. This solidli... [Phys. Rev. E 85, 021404] Published Tue Feb 07, 2012
Duty ratio of cooperative molecular motors 2012-02-07T10:00:00-05:00 Author(s): Nadiv Dharan and Oded FaragoMolecular motors are found throughout the cells of the human body and have many different and important roles. These micromachines move along filament tracks and have the ability to convert chemical energy into mechanical work that powers cellular motility. Different types of motors are characterize... [Phys. Rev. E 85, 021904] Published Tue Feb 07, 2012
Time-scale and noise optimality in self-organized critical adaptive networks 2012-02-07T10:00:00-05:00 Author(s): Christian KuehnRecent studies have shown that adaptive networks driven by simple local rules can organize into “critical” global steady states, providing another framework for self-organized criticality (SOC). We focus on the important convergence to criticality and show that noise and time-scale optimality are re... [Phys. Rev. E 85, 026103] Published Tue Feb 07, 2012
Conditional strategies and the evolution of cooperation in spatial public goods games 2012-02-07T10:00:00-05:00 Author(s): Attila Szolnoki and Matjaž PercThe fact that individuals will most likely behave differently in different situations begets the introduction of conditional strategies. Inspired by this, we study the evolution of cooperation in the spatial public goods game, where, besides unconditional cooperators and defectors, also different ty... [Phys. Rev. E 85, 026104] Published Tue Feb 07, 2012
Electron transfer reactions in condensed phase: Effect of reversibility 2012-02-07T10:00:00-05:00 Author(s): Kajal Dhole, Naresh K. Jena, Alok Samanta, and Swapan K. GhoshWe propose a generalized one-dimensional kinetic equation for multidimensional reversible electron transfer (ET) reaction with a nonequilibrium situation as the initial condition. The rate constant for the forward reversible ET reaction obtained here consists of the rate for the corresponding irreve... [Phys. Rev. E 85, 026105] Published Tue Feb 07, 2012 |
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