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Inertia-Centric Stability Analysis of a Planar Uniform Dust Molecular Cloud with Weak Neutral-Charged Dust Frictional Coupling

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Plasma Science and Technology 2014年第5期16卷 433-447页

作者： P.K.KARMAKAR B.BORAH Department of Physics Tezpur University

This paper adopts an inertia-centric evolutionary model to study the excitation mechanism of new gravito-electrostatic eigenmode structures in a one-dimensional（1-D） planar self-gravitating dust molecular cloud（DMC） on the Jeans scale.A quasi-neutral multi-fluid consisting of warm electrons,warm ions,neutral gas and identical inertial cold dust grains with partial ionization is *** grain-charge is assumed not to vary at the fluctuation evolution time *** neutral gas particles form the background,which is weakly coupled with the collapsing grainy plasma *** gravitational decoupling of the background neutral particles is justifiable for a higher inertial mass of the grains with higher neutral population density so that the Jeans mode frequency becomes reasonably *** physical basis is the Jeans assumption of a self-gravitating uniform medium adopted for fiducially analytical simplification by neglecting the zero-order ***,the equilibrium is justifiably treated initially as ＂homogeneous＂.The efficacious inertial role of the thermal species amidst weak collisions of the neutral-charged grains is taken into account.A standard multiscale technique over the gravito-electrostatic equilibrium yields a unique pair of Korteweg-de Vries（KdV） *** is integrated numerically by the fourth-order Runge-Kutta method with multi-parameter variation for exact shape ***,the model is conducive for the propagation of new conservative solitary spectral *** basic physics,parametric features and unique characteristics are *** results go qualitatively in good correspondence with the earlier observations made by *** applications relevant to space and astrophysical environments are concisely highlighted.

关键词： molecular cloud pair KdV equations solitary patterns

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Dissipative Discrete System with Nearest-Neighbor Interaction for the Nonlinear Electrical Lattice

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Journal of Modern Physics 2012年第6期3卷 438-446页

作者： Saidou Abdoulkary Tibi Beda Serge Y.Doka Fabien II Ndzana Louis Kavitha Alidou Mohamadou Departement des Sciences Physiques Ecole Normale SuperieureUniversite de MarouaMarouaCameroon Laboratory of Mechanics Department of PhysicsFaculty of ScienceUniversity of Yaounde IYaoundeCameroon Ecole Nationale Superieure Polytechnique Universite de Yaounde IYaoundeCameroon Department of Physics Faculty of ScienceUniversity of NgaoundereNgaoundereCameroon Department of Physics Periyar UniversitySalemIndia Condensed Matter Laboratory Department of PhysicsFaculty of ScienceUniversity of DoualaDoualaCameroon

A generalized dissipative discrete complex Ginzburg-Landau equation that governs the wave propagation in dissipative discrete nonlinear electrical transmission line with negative nonlinear resistance is derived. This equation presents arbitrarily nearest-neighbor nonlinearities. We analyze the properties of such model both in connection to their modulational stability, as well as in regard to the generation of intrinsic localized modes. We present a generalized discrete Lange-Newell criterion. Numerical simulations are performed and we show that discrete breathers are generated through modulational instability.

关键词： Generalized Dissipative Discrete Complex Ginzburg-Landau Equation Discrete Lange Newell-Criterion Pulse Trains solitary patterns

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