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The void, which is a dust-free region inside the dust cloud in the plasma, results from a balance of the electrostatic force and the ion drag force on a dust particulate. The ion drag force having numerous forms, some of which are based on models whe
Externí odkaz:
http://arxiv.org/abs/physics/0610265
An investigation of dust-acoustic solitary waves in unmagnetized dusty plasma whose constituents are inertial charged dust grains, Boltzmannian electrons and nonthermal ions has been conducted. The pseudo potential as well as the reductive perturbati
Externí odkaz:
http://arxiv.org/abs/physics/0607115
Autor:
Annou, R., Ferhat, B.
A bifurcation of strong shock waves front for xenon in a shock tube has been noted. We propose a model which explains the effect and gives a variation-law of the front shape with respect to the Mach number M and the unperturbed gas pressure p1.
Externí odkaz:
http://arxiv.org/abs/physics/0511143
A Gaussian laser pulse with a square profile in time propagating in a parabolic plasma channel, exerts a ponderomotive force on electrons that drives a large amplitude electrostatic wake potential phi. An analytic solution for phi is possible when a
Externí odkaz:
http://arxiv.org/abs/physics/0511108
It is shown that the grain mass fluctuation, which is due to the grain sputtering by the attracted ions, may be at the root of a new instability in infinite, unmagnetized and homogeneous dusty plasmas. The growth rate is determined in the framework o
Externí odkaz:
http://arxiv.org/abs/physics/0510205
Autor:
Annou, R.
A plasma based isotopic separation method is proposed. Isotopes of different masses get separated during plasma expansion. Relying on Gurevichs (A.V.Gurevich, L.V.Pariiskaya and L.P.Pitaevskii, Sov.Phys.JETP, 36,274 (1973)) plasma expansion into a va
Externí odkaz:
http://arxiv.org/abs/physics/0510156
Autor:
Haddadou, A., Annou, R.
A mechanism that explains the increase of electromagnetic (EM) perturbations during earthquakes is proposed. When earthquakes occur, surface waves propagate along the globe surface inducing a globe surface rippling, which is reproduced in an amplifie
Externí odkaz:
http://arxiv.org/abs/physics/0510078
The grains immersed in plasma get eroded by the ions falling onto them. As a consequence, they exhibit self-consistent mass fluctuations due to perturbations in the plasma charging currents. The grain mass is then a dynamical variable. The modificati
Externí odkaz:
http://arxiv.org/abs/physics/0510037
Autor:
Annou, R., Tripathi, V. K.
The excitation of wakefields by a triangular temporal profile laser pulse with an abrupt fall in a step density profile plasma channel is investigated analytically and an exact solution is obtained. The excitation is more efficient for t~tp, where t
Externí odkaz:
http://arxiv.org/abs/physics/0510025