Evolution of pressure profiles during the discharge of a silo
Christophe Perge, Maria Alejandra Aguirre, Paula Alejandra Gago, Luis A. Pugnaloni, Denis Le Tourneau et al.
We 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 .
Unsteady non-Newtonian hydrodynamics in granular gases
Antonio Astillero and Andres Santos
The 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 .
Magnetic navigation system for the precise helical and translational motions of a microrobot in human blood vessels
S. M. Jeon, G. H. Jang, H. C. Choi, S. H. Park, and J. O. Park
Different magnetic navigation systems (MNSs) have been investigated for the wireless manipulation of microrobots in human blood vessels. Here we propose a MNS and methodology for generation of both the precise helical and translational motions of a microrobot to improve its maneuverability in comple ... [J. Appl. Phys. 111, 07E702 (2012)] published Tue Feb 7, 2012.
Nonlinear wall pressure of a plunged granular column
Hiroaki Katsuragi
Scalings for slow drag and wall pressures in a plunged granular column are experimentally studied. A granular column is prepared in a cylindrical container and a spherical intruder is slowly plunged into it. Quasistatic drag force and pressures at the bottom and the side wall are measured simultaneo ... [Phys. Rev. E 85, 021301 ] published .
Laser heating of finite two-dimensional dust clusters: B. Simulations
Hauke Thomsen, Hanno Kahlert, Michael Bonitz, Jan Schablinski, Dietmar Block et al.
Laser heating of monolayer dusty plasmas is investigated theoretically by Langevin dynamics simulations. The laser radiation pressure is used to externally control the dust temperature without changing the plasma properties. We show that the laser scanning pattern has a major influence on both the v ... [Phys. Plasmas 19, 023701 (2012)] published Fri Feb 3, 2012.
Erratum: Segregation of sedimenting grains of different densities in an oscillating velocity field of strongly nonlinear surface waves [Phys. Rev. E 78, 022301 (2008)]
A. B. Ezersky and F. Marin
Abstract not available. [Phys. Rev. E 85, 019906 ] published .
Angular particle sliding down a transversally vibrated smooth plane
Arnaud Benedetti, Philippe Sornay, Blanche Dalloz, and Maxime Nicolas
We present a theoretical, numerical, and experimental study about the sliding motion of an angular particle down a vibrated smooth plane. The model is based on a Coulomb's friction law with a unique friction coefficient. The model is solved numerically and is tested with controlled experiments. Diff ... [Phys. Rev. E 85, 011307 ] published .
Flexural fracturing of a cohesive granular layer
Jean-Christophe Geminard, Lorene Champougny, Pierre Lidon, and Francisco Melo
We report on the fracturing of cohesive granular materials subjected to a flexural deformation. A thin layer of glass beads or of flour is deposited on an unstretchable membrane to which flexion is imposed. We observe the formation of a periodic fracturing pattern whose characteristics are discussed ... [Phys. Rev. E 85, 012301 ] published .
Microstructure evolution during impact on granular matter
L. Kondic, X. Fang, W. Losert, C. S. O'Hern, and R. P. Behringer
We study the impact of an intruder on a dense granular material. The process of impact and interaction between the intruder and the granular particles is modeled using discrete element simulations in two spatial dimensions. In the first part of the paper we discuss how the intruder's dynamics depend ... [Phys. Rev. E 85, 011305 ] published .
Relevance of numerical simulations to booming sand
Patrick Richard, Sean McNamara, and Merline Tankeo
We have performed a simulation study of three-dimensional cohesionless granular flows down an inclined chute. We find that the oscillations observed in [L. E. Silbert, Phys. Rev. Lett. 94, 098002 (2005)] near the angle of repose are harmonic vibrations of the lowest normal mode. Their frequencies de ... [Phys. Rev. E 85, 010301 ] published .
Cylindrical Shell Control With Center- and Corner-Placed Photostrictive Skew-Quad Actuator Systems
J. Jiang, H. H. Yue, Z. Q. Deng, and H. S. Tzou
Light-driven photostrictive actuators can induce control actions for wireless non-contact actuation and control of precision structures and systems. Conventional distributed actuators laminated on shells and plates usually only introduce uniform control forces and moments. Structural actuation and c ... [J. Vib. Acoust. 134, 024503 (2012)] published Wed Jan 18, 2012.
Limitations on cloning in classical mechanics
Aaron Fenyes
In this paper, we show that a result precisely analogous to the traditional quantum no-cloning theorem holds in classical mechanics. This classical no-cloning theorem does not prohibit classical cloning, we argue, because it is based on a too-restrictive definition of cloning. Using a less popular, ... [J. Math. Phys. 53, 012902 (2012)] published Thu Jan 12, 2012.
Impurity in a sheared inelastic Maxwell gas
Vicente Garzo and Emmanuel Trizac
The Boltzmann equation for inelastic Maxwell models is considered in order to investigate the dynamics of an impurity (or intruder) immersed in a granular gas driven by a uniform shear flow. The analysis is based on an exact solution of the Boltzmann equation for a granular binary mixture. It applie ... [Phys. Rev. E 85, 011302 ] published .
Structure factors in granular experiments with homogeneous fluidization
Andrea Puglisi, Andrea Gnoli, Giacomo Gradenigo, Alessandro Sarracino, and Dario Villamaina
Velocity and density structure factors are measured over a hydrodynamic range of scales in a horizontal quasi-2D fluidized granular experiment, with packing fractions phi [is-an-element-of] [10%, 40%]. The fluidization is realized by vertically vibrating a rough plate, on top of which particles perf ... [J. Chem. Phys. 136, 014704 (2012)] published Fri Jan 6, 2012.
Equipartition of Rotational and Translational Energy in a Dense Granular Gas
Kiri Nichol and Karen E. Daniels
Experiments quantifying the rotational and translational motion of particles in a dense, driven, 2D granular gas floating on an air table reveal that kinetic energy is divided equally between the two translational and one rotational degrees of freedom. This equipartition persists when the particle p ... [Phys. Rev. Lett. 108, 018001 ] published .
Influence of polydispersity on micromechanics of granular materials
M. Reza Shaebani, Mahyar Madadi, Stefan Luding, and Dietrich E. Wolf
We study the effect of polydispersity on the macroscopic physical properties of granular packings in two and three dimensions. A mean-field approach is developed to approximate the macroscale quantities as functions of the microscopic ones. We show that the trace of the fabric and stress tensors are ... [Phys. Rev. E 85, 011301 ] published .
Silo Clogging Reduction by the Presence of an Obstacle
Iker Zuriguel, Alvaro Janda, Angel Garcimartin, Celia Lozano, Roberto Arevalo et al.
We present experimental results on the effect that inserting an obstacle just above the outlet of a silo has on the clogging process. We find that, if the obstacle position is properly selected, the probability that the granular flow is arrested can be reduced by a factor of 100. This dramatic effec ... [Phys. Rev. Lett. 107, 278001 ] published .
Generation-recombination Dynamics via Acoustic Phonons in a Disordered Graphene
F. T. Vasko and V. V. Mitin
Generation-recombination interband transitions via acoustic phonons are allowed in a disordered graphene because of violation of the energy-momentum conservation requirements. The generation-recombination dynamics of concentration is analyzed based on the quasi-equilibrium approach for the scatterin ... [AIP Conf. Proc. 1416, 181 (2011)] published Wed Dec 28, 2011.
CogenerationNecessity and Existing Barriers
Deepshikha Sharma
Cogeneration has emerged as one of the cost effective solution for producing energy. So, it is defined as those processes in which useful electric (or mechanical) energy and heat energy are produced simultaneously from a single primary energy source. The fuel used for cogeneration can be conventiona ... [AIP Conf. Proc. 1414, 201 (2011)] published Wed Dec 28, 2011.
Creep motion of a model frictional system
Baptiste Blanc, Luis A. Pugnaloni, and Jean-Christophe Geminard
We report on the dynamics of a model frictional system submitted to minute external perturbations. The system consists of a chain of sliders connected through elastic springs that rest on an incline. By introducing cyclic expansions and contractions of the springs we observe a reptation of the chain ... [Phys. Rev. E 84, 061303 ] published .
Local Anisotropy in Globally Isotropic Granular Packings
K. Karimi and C. E. Maloney
We report on two-dimensional computer simulations of frictionless granular packings at various area fractions phi above the jamming point phi. We measure the anisotropy in coarse-grained stress epsilon and shear modulus epsilon as functions of coarse-graining scale, R. epsilon can be collapsed onto ... [Phys. Rev. Lett. 107, 268001 ] published .
Measurements of resonance frequencies of clarinet reeds and simulations. (arXiv:1202.2114v1 [physics.class-ph])
ePrint arXiv http://arXiv.org/