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Mostrando ítems 31-40 de 51
Artículo
Coupling of Dipole Mode to γ -unstable Quadrupole Oscillations
(Elsevier, 2000)
The coupling of the high-lying dipole mode to the low-lying quadrupole modes for the case of deformed γ-unstable nuclei is studied. Results from the geometrical model are compared to those obtained within the dipole boson ...
Artículo
Resonant behavior of a Poisson process driven by a periodic signal
(American Physical Society, 1995)
The statistical properties of the residence times of a periodically modulated Poisson process (time-dependent shot noise) on a line segment are analyzed. They show the characteristic features of a resonant behavior, which ...
Artículo
Simple model with facilitated dynamics for granular compaction
(American Physical Society, 1999)
A simple lattice model is used to study compaction in granular media. As in real experiments, we consider a series of taps separated by large enough waiting times. The relaxation of the density exhibits the characteristic ...
Artículo
Glassy behavior in a simple model with entropy barriers
(American Physical Society, 1997)
We study the dynamical behavior of a system with a variable number of particles n. The empty state n=0 is the ground state, while all the other states n>0 are degenerate in energy. In equilibrium, the mean number of particles ...
Artículo
Path Integral Solution of the Kramers Problem
(American Physical Society, 1996-12-30)
An iterative method to generate a discrete path integral solution of the Kramers problem is presented. It is based on a straightforward derivation of the functional formalism from the underlying Langevin equations. The ...
Artículo
Relativistic effects in electromagnetic nuclear responses in the quasi-elastic delta region
(Elsevier, 1999-09-20)
A new non-relativistic expansion in terms of the nucleon's momentum inside nuclear matter of the current for isobar electro-excitation from the nucleon is perfo rmed. Being exact with respect to the transferred energy and ...
Artículo
Threshold anomaly in non-central forces
(Elsevier, 1993)
The behaviour of the threshold anomaly for non-central potentials, which account for collective excitations in heavy-ion collisions, is investigated. It is shown that the non-central potentials should exhibit an energy ...
Artículo
Steady state of a fluidized granular medium between two walls at the same temperature
(American Physical Society, 1998)
The steady state of a low-density gas of inelastic hard spheres confined between two parallel walls at the same temperature is studied. Because of the dissipation in collisions, the state is not uniform but highly inhomogeneous ...
Artículo
Model kinetic equation for low-density granular flow
(American Physical Society, 1996)
A model kinetic equation is proposed to describe the time evolution of a gas composed of particles which collide inelastically. Dissipation in collisions is described by means of a parameter which is related to the coefficient ...
Artículo
Wetting and interfacial order at nematic free surfaces
(IOP Publishing Ltd., 1996-07-20)
We apply a density-functional theory to the free surface of a model liquid crystal, to investigate the orientational order at the nematic free surface of systems exhibiting orientational wetting at the isotropic liquid-vapour ...