Physical Review E

Physical Review E

Recent articles in Physical Review E
Double-layer shocks in a magnetized quantum plasma Author(s): A. P. Misra and S. Samanta The formation of small but finite amplitude electrostatic shocks in the propagation of quantum ion-acoustic waves obliquely to an external magnetic field is reported in a quantum electron-positron-ion plasma. Such shocks are seen to have double-layer (DL) structures composed of the compressive and a... [Phys. Rev. E 82, 037401] Published Thu Sep 02, 2010 Dynamics of one- and two-dimensional fronts in a bistable equation with time-delayed global feedback: Propagation failure and control mechanisms Author(s): Yassine Boubendir, Vicenç Méndez, and Horacio G. Rotstein We study the evolution of fronts in a bistable equation with time-delayed global feedback in the fast reaction and slow diffusion regime. This equation generalizes the Hodgkin-Grafstein and Allen-Cahn equations. We derive a nonlinear equation governing the motion of fronts, which includes a term wit... [Phys. Rev. E 82, 036601] Published Thu Sep 02, 2010 Drying of a model soil Author(s): P. Faure and P. Coussot Drying experiments have been carried out with model soils made of different pastes filling granular packings. A detailed information concerning the time evolution of the water saturation distribution inside the sample was obtained from magnetic resonance imaging measurements. This study makes it pos... [Phys. Rev. E 82, 036303] Published Thu Sep 02, 2010 Thin film formation during splashing of viscous liquids Author(s): Michelle M. Driscoll, Cacey S. Stevens, and Sidney R. Nagel After impact onto a smooth dry surface, a drop of viscous liquid initially spreads in the form of a thick lamella. If the drop splashes, it first emits a thin fluid sheet that can ultimately break up into droplets causing the splash. Ambient gas is crucial for creating this thin sheet. The time for ... [Phys. Rev. E 82, 036302] Published Thu Sep 02, 2010 Vortices and the entrainment transition in the two-dimensional Kuramoto model Author(s): Tony E. Lee, Heywood Tam, G. Refael, Jeffrey L. Rogers, and M. C. Cross We study synchronization in the two-dimensional lattice of coupled phase oscillators with random intrinsic frequencies. When the coupling K is larger than a threshold K_{E} , there is a macroscopic cluster of frequency-synchronized oscillators. We explain why the macroscopic cluster disappears at K_... [Phys. Rev. E 82, 036202] Published Thu Sep 02, 2010 Scaling of load in communications networks Author(s): Onuttom Narayan and Iraj Saniee We show that the load at each node in a preferential attachment network scales as a power of the degree of the node. For a network whose degree distribution is p(k)âˆ¼k^{âˆ’Î³} , we show that the load is l(k)âˆ¼k^{Î·} with Î·=Î³âˆ’1 , implying that the probability distribution for the load is p(l)âˆ... [Phys. Rev. E 82, 036102] Published Thu Sep 02, 2010 Cavity analysis on the robustness of random networks against targeted attacks: Influences of degree-degree correlations Author(s): Yoshifumi Shiraki and Yoshiyuki Kabashima We developed a scheme for evaluating the size of the largest connected subnetwork (giant component) in random networks and the percolation threshold when sites (nodes) and/or bonds (edges) are removed from the networks based on the cavity method of statistical mechanics of disordered systems. We app... [Phys. Rev. E 82, 036101] Published Thu Sep 02, 2010 Equilibrium polyelectrolyte bundles with different multivalent counterion concentrations Author(s): Mehmet Sayar and Christian Holm We present the results of molecular-dynamics simulations on the salt concentration dependence of the formation of polyelectrolyte bundles in thermodynamic equilibrium. Extending our results on salt-free systems we investigate here deficiency or excess of trivalent counterions in solution. Our result... [Phys. Rev. E 82, 031901] Published Thu Sep 02, 2010 Restricted dynamics in oriented semicrystalline polymers: Poly(vinilydene fluoride) Author(s): Amelia Linares, Aurora Nogales, Alejandro Sanz, Tiberio A. Ezquerra, and Marco Pieruccini The effect of confinement by crystals on the α relaxation, observed by dielectric broadband spectroscopy, in isotropic as well as in oriented semicrystalline poly(vinilydene fluoride), is analyzed on the basis of a new thermodynamic model. In both samples, it has been found that the average free-en... [Phys. Rev. E 82, 031802] Published Thu Sep 02, 2010 Fracture of colloidal single-crystal films fabricated by controlled vertical drying deposition Author(s): He Cao, Ding Lan, Yuren Wang, Alex A. Volinsky, Li Duan, and Heng Jiang Controlled vertical drying deposition method was used to make high-quality single crystal close-packed colloidal films formed of different radii polystyrene latex spheres on glass substrates coming from a low concentration water suspension (0.1% volume fraction). Regardless of the spheres radii the ... [Phys. Rev. E 82, 031602] Published Thu Sep 02, 2010 Janssen effect and the stability of quasi-two-dimensional sandpiles Author(s): Fatemeh Ebrahimi, Tahereh Azizpour, and Hamed Maleki We present the results of three-dimensional discrete element simulations of global normal stresses in quasi-two-dimensional sandpiles formed by pouring monodispersed cohesionless spherical grains into a vertical granular Hele-Shaw cell. We observe the Janssen effect which is the phenomenon of pressu... [Phys. Rev. E 82, 031302] Published Thu Sep 02, 2010 Statistical physics of elastoplastic steady states in amorphous solids: Finite temperatures and strain rates Author(s): Smarajit Karmakar, Edan Lerner, Itamar Procaccia, and Jacques Zylberg The effect of finite temperature T and finite strain rate γ [over ̇] on the statistical physics of plastic deformations in amorphous solids made of N particles is investigated. We recognize three regimes of temperature where the statistics are qualitatively different. In the first regime the tempe... [Phys. Rev. E 82, 031301] Published Thu Sep 02, 2010 Markovian iterative method for degree distributions of growing networks Author(s): Dinghua Shi, Huijie Zhou, and Liming Liu Currently, simulation is usually used to estimate network degree distribution P(k) and to examine if a network model predicts a scale-free network when an analytical formula does not exist. An alternative Markovian chain-based numerical method was proposed by Shi [Phys. Rev. E 71, 036140 (2005)] to ... [Phys. Rev. E 82, 031105] Published Thu Sep 02, 2010 Thermocapillary flow on superhydrophobic surfaces Author(s): Tobias Baier, Clarissa Steffes, and Steffen Hardt A liquid in Cassie-Baxter state above a structured superhydrophobic surface is ideally suited for surface driven transport due to its large free surface fraction in close contact to a solid. We investigate thermal Marangoni flow over a superhydrophobic array of fins oriented parallel or perpendicula... [Phys. Rev. E 82, 037301] Published Wed Sep 01, 2010 Dynamics of noncontact rack-and-pinion device: Periodic back-and-forth motion of the rack Author(s): Mojtaba Nasiri, Ali Moradian, and MirFaez Miri We study a nanoscale system composed of one corrugated cylinder (pinion) and one corrugated plate (rack). The pinion and rack have no mechanical contact, but are coupled via the lateral Casimir force. We consider the case where the rack position versus time is a periodic triangular signal. We find t... [Phys. Rev. E 82, 037101] Published Wed Sep 01, 2010 Simple method to measure the interaction potential of dielectric grains in a dusty plasma Author(s): Zhuanhao Zhang, Ke Qiao, Jie Kong, Lorin Matthews, and Truell Hyde A simple minimally perturbative method is introduced which provides the ability to experimentally measure both the radial confining potential and the interaction potential between two individual dust particles, levitated in the sheath of a radio-frequency (RF) argon discharge. In this technique, a s... [Phys. Rev. E 82, 036401] Published Wed Sep 01, 2010 Optimal harmonic response in a confined Bödewadt boundary layer flow Author(s): Younghae Do, Juan M. Lopez, and Francisco Marques The Bödewadt boundary layer flow on the stationary bottom end wall of a finite rotating cylinder is very sensitive to perturbations and noise. Axisymmetric radial waves propagating inward have been observed experimentally and numerically before the appearance of spiral three-dimensional instabiliti... [Phys. Rev. E 82, 036301] Published Wed Sep 01, 2010 Hub synchronization in scale-free networks Author(s): Tiago Pereira Heterogeneity in the degree distribution is known to suppress global synchronization in complex networks of symmetrically coupled oscillators. Scale-free networks display a great deal of heterogeneity, containing a few nodes, termed hubs, that are highly connected, while most nodes receive only a fe... [Phys. Rev. E 82, 036201] Published Wed Sep 01, 2010 Synchronization of quasiperiodic oscillations to a periodic force studied with semiconductor lasers Author(s): A. Loose, H.-J. Wünsche, and F. Henneberger We experimentally study synchronization processes in a system of two different multisection semiconductor lasers. Periodic self-pulsations of laser 1 are injected into laser 2, which is operating in a regime with two-frequency quasiperiodic self-pulsations. The experimental system demonstrates the n... [Phys. Rev. E 82, 035201] Published Wed Sep 01, 2010 Direct small-angle-neutron-scattering observation of stretched chain conformation in nanocomposites: More insight on polymer contributions in mechanical reinforcement Author(s): Nicolas Jouault, Florent Dalmas, Sylvère Said, Emanuela Di Cola, Ralf Schweins, Jacques Jestin, and François Boué In this paper we present a direct measurement of stretched chain conformation in polymer nanocomposites in a large range of deformation using a specific contrast-matched small angle neutron scatttering (SANS) method. Whatever are the filler structure and the chain length the results show a clear ide... [Phys. Rev. E 82, 031801] Published Wed Sep 01, 2010 Interface growth in two dimensions: A Loewner-equation approach Author(s): Miguel A. Durán and Giovani L. Vasconcelos The problem of Laplacian growth in two dimensions is considered within the Loewner-equation framework. Initially the problem of fingered growth is revisited and an exact solution for a three-finger configuration is reported. Then a general class of growth models for an interface growing in the upper... [Phys. Rev. E 82, 031601] Published Wed Sep 01, 2010 Comparing parallel- and simulated-tempering-enhanced sampling algorithms at phase-transition regimes Author(s): Carlos E. Fiore and M. G. E. da Luz Two important enhanced sampling algorithms, simulated (ST) and parallel (PT) tempering, are commonly used when ergodic simulations may be hard to achieve, e.g., due to a phase space separated by large free-energy barriers. This is so for systems around first-order phase transitions, a case still not... [Phys. Rev. E 82, 031104] Published Wed Sep 01, 2010 Identification of a polymer growth process with an equilibrium multicritical collapse phase transition: The meeting point of swollen, collapsed, and crystalline polymers Author(s): Jason Doukas, Aleksander L. Owczarek, and Thomas Prellberg We have investigated a polymer growth process on the triangular lattice where the configurations produced are self-avoiding trails. We show that the scaling behavior of this process is similar to the analogous process on the square lattice. However, while the square lattice process maps to the colla... [Phys. Rev. E 82, 031103] Published Wed Sep 01, 2010 Non-Kosterlitz-Thouless transitions for the q -state clock models Author(s): Seung Ki Baek and Petter Minnhagen The q -state clock model with the cosine potential has a single phase transition for q≤4 and two transitions for q≥5 . It is shown by Monte Carlo simulations that the helicity modulus for the five-state clock model (q=5) does not vanish at the high-temperature transition. This is in contrast to ... [Phys. Rev. E 82, 031102] Published Wed Sep 01, 2010 Energy representation for nonequilibrium Brownian-like systems: Steady states and fluctuation relations Author(s): Bohdan I. Lev and Alexei D. Kiselev Stochastic dynamics in the energy representation is used as a method to represent nonequilibrium Brownian-like systems. It is shown that the equation of motion for the energy of such systems can be taken in the form of the Langevin equation with multiplicative noise. Properties of the steady states ... [Phys. Rev. E 82, 031101] Published Wed Sep 01, 2010 Bursting of a thin film in a confined geometry: Rimless and constant-velocity dewetting Author(s): Ayako Eri and Ko Okumura We study the bursting dynamics of a thin oil film sandwiched by glycerol aqueous solution in a confined geometry where the circular symmetry of the bursting hole is broken. We find that the bursting proceeds with a constant velocity except for initial times and the velocity is governed by the viscos... [Phys. Rev. E 82, 030601] Published Wed Sep 01, 2010 Collective shuttling of attracting particles in asymmetric narrow channels Author(s): A. Pototsky, A. J. Archer, M. Bestehorn, D. Merkt, S. Savel’ev, and F. Marchesoni The rectification of a single file of attracting particles subjected to a low frequency ac drive is proposed as a working mechanism for particle shuttling in an asymmetric narrow channel. Increasing the particle attraction results in the file condensing, as signaled by the dramatic enhancement of th... [Phys. Rev. E 82, 030401] Published Wed Sep 01, 2010 Erratum: Turbulent kinetic-energy and a possible hierarchy of length scales in a generalization of the Navier-Stokes- α theory [Phys. Rev. E 75, 056306 (2007)] Author(s): Eliot Fried and Morton E. Gurtin [Phys. Rev. E 82, 029905] Published Tue Aug 31, 2010 Heat-flow equation motivated by the ideal-gas shock wave Author(s): Brad Lee Holian and Michel Mareschal We present an equation for the heat-flux vector that goes beyond Fourier’s Law of heat conduction, in order to model shockwave propagation in gases. Our approach is motivated by the observation of a disequilibrium among the three components of temperature, namely, the difference between the temper... [Phys. Rev. E 82, 026707] Published Tue Aug 31, 2010 Kinetic instability of the dust acoustic mode in inhomogeneous, partially magnetized plasma with both positively and negatively charged grains Author(s): J. Vranjes and S. Poedts A purely kinetic instability of the dust acoustic mode in inhomogeneous plasmas is discussed. In the presence of a magnetic field, electrons and ions may be magnetized while at the same time dust grains may remain unmagnetized. Although the dynamics of the light species is strongly affected by the m... [Phys. Rev. E 82, 026411] Published Tue Aug 31, 2010

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