الفهرس 
Abstract
Plasma as the fourth state of matterOnly 14 pages are availabe for public view
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Abstract
Propagation of threedimensional nonlinear dustacoustic waves (DAWs) in a collisionless, unmagnetized three component dusty plasma, consisting of cold dust particles with constant charge, isothermal ions and electrons is investigated. Employing the reductive perturbation theory we derive a KadomtsevPetviashvili (KP) equation. The soliton solution of KP equation is obtained. It is found that only rarefactive solitary waves exist in such system. The effects of dust temperature and charge variation of dust particles on the propagation of threedimensional DAWs in a collisionless, unmagnetized three component dusty plasma comprised of warm dust particles, isothermal ions and electrons are considered. The perturbation theory leads to KP equation to describe the evolution of the system. The soliton solution of KP equation is obtained. It is found that only rarefactive solitons can exist in the system. The effects of various plasma parameters on the features of the rarefactive solitons are also investigated. The effects of external magnetic field and higherorder correction on the propagation of the DAWs in a collisionless, magnetized three component dusty plasma consisting of warm and variational charged dust particles, isothermal ions and electrons are examined. The basic set electrons, and of fluid equations is reduced to ZakharovKuznetsov (ZK) equation for firstorder perturbed potential and a linear inhomogeneous ZakharovKuznetsov type (LIZKT) equation for the secondorder perturbed potential. Stationary solution of both equations is obtained using a renormalization method. The effects the higherorder contribution, external magnetic field, dust charge variation, dust grains temperature, ratios of temperature and density of positive ions to nature of the directional cosine of the wave vector k along the x axis on the the solitary waves are investigated.