الفهرس 
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Abstract
In this thesis, we have investigated the different thermal effects on the properties of linear and nonlinear waves in space dusty plasma. These effects are carried out via the different plasma particles (electrons and ions) distributions as well as the effect of ion kinematic viscosity on different radiative-cooling modes. The thesis consists of four chapters as follows: Chapter 1 provides a brief introduction and overview of the dusty plasma phenomena in nature. Chapter 2 deals with the investigation of the linear and nonlinear properties of the dust acoustic (DA) waves in an unmagnetized and dissipative dusty plasma system composed of negatively charged dust grains as well as electrons and ions obeying different distributions. In the beginning, the dusty plasma is considered to be inhomogeneous with non-adiabatic dust charge fluctuation, electrons and ions obeying nonthermal distributions. By using the standard normal mode analysis, the linear properties of the DA waves have been studied. In order to proceed further, the investigation is extended to include the characteristics of nonlinear DA waves in the homogeneous case where the dust charge is assumed to be constant. A Kortewege-de Vries-Burgers (KdV-Burgers) equation and a modified Kortewege-de Vries-Burgers (mKdV-Burgers) equation are derived using the reductive perturbation technique in the case of electrons and ions following nonthermal distributions and in the case of Maxwellian electrons and ions obeying vortex-like distribution, respectively and their solutions (soliton, a combination between shock and soliton, monotonic and oscillatory shock wave solutions) are obtained. Chapter 3 deals with the study of the characteristics of linear and nonlinear DA waves in a dusty plasma consisting of negatively charged dust grains, superthermal electrons and ions obeying nonextensive distribution. The nonlinear analysis is carried out through two different techniques namely, the Sagdeev pseudopotential technique (to study large amplitude DA waves) and the reductive perturbation technique (to study small amplitude DA waves). Chapter 4 deals with the study of the effect of the ion kinematic viscosity on different radiative cooling modes in a dusty plasma system. New dispersion relations are derived for each radiative cooling mode by employing the standard normal mode analysis.