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Mostrando ítems 31-39 de 39
Artículo
On the validity of linear hydrodynamics for low-density granular flows described by the Boltzmann equation
(European Physical Society, 1999)
The direct Monte Carlo simulation method is used to check the validity of the hydrodynamic description of a low-density granular flow in the linear region about the homogeneous cooling state. Good agreement is found between ...
Artículo
Kinetic model for the hard-sphere fluid and solid
(American Physical Society, 1998)
The revised Enskog kinetic theory (RET) for a system of hard spheres provides an exceptionally broad description of mesoscopic and macroscopic dynamics, applicable for both fluid and solid phases, long and short wavelengths, ...
Artículo
External-field effects on molecular electronic transitions in charge-transfer systems
(American Physical Society, 1998)
We investigate strong-external-field effects on optical transitions between electronic states of charge-transfer systems in condensed media. We will use as a model a two-level system coupled to a dissipative medium driven ...
Artículo
High energy tail in the velocity distribution of a granular gas
(American Physical Society, 1999)
The Enskog-Boltzmann equation for a homogeneous freely evolving system of smooth hard disks colliding inelastically is solved by means of the direct simulation Monte Carlo method. The distribution function shows an exponential ...
Artículo
Analysis of the Evans and Baranyai variational principle in dilute gases
(American Physical Society, 1993)
A variational principle for thermostated nonequilibrium steady states recently proposed by Evans and Baranyai [Phys. Rev. Lett. 67, 2597 (1991)] is analyzed by means of a model kinetic equation for dilute gases. It is shown ...
Artículo
Dynamics of single and multiple Zener transitions
(American Institute of Physics Publising LLC, 1992)
The probability of remaning in a given state is evaluated for a two-level system that can cross repeatedly and periodically as a function of a control parameter. The possibility of multiple Zener transitions between the ...
Artículo
Hartree-Bose mean-field approximation for the interacting boson model (IBM-3)
(American Physical Society, 1998-02-01)
A Hartree-Bose mean-field approximation for the IBM-3 is presented. A Hartree-Bose transformation from spherical to deformed bosons with charge-dependent parameters is proposed which allows bosonic pair correlations and ...
Artículo
On the Validity of a Variational Principle for Far-from-Equilibrium Steady States
(IOP Publishing Ltd., 1995-03-20)
It is shown that an exact solution of the non-linear Boltzmann equation does not verify the variational principle for non-equilibrium steady states proposed by Evans and Baranyai (Phys. Rev. Lett., 67 (1991) 2597). Therefore, ...
Artículo
Analysis of meson exchange and isobar currents in (e,e′p) reactions from 16O
(American Physical Society, 1999-07-01)
An analysis of the effects of meson exchange and isobar currents in exclusive (e,e′p) processes from 16O under quasifree kinematics is presented. A model that has probed its feasibility for inclusive quasielastic (e,e′) ...