الفهرس 
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Abstract
Theoretical investigation of the characteristics of the head-on collision between two dust-acoustic solitary waves (DASWs) in an adiabatic dusty plasma consisting of variable negatively charged dust grains, isothermal electrons and two-temperature isothermal ions in the presence of an external oblique magnetic field is studied. Applying the extended Poincaré-Lighthill-Kuo (PLK) method, the Korteweg-de Vries (KdV) equations, the trajectories and the analytical phase shifts after the head-on collision of two-solitary waves are derived. The effects of the magnetic field and its obliqueness, the two different types of isothermal ions and the dust particles’ adiabaticity on the phase shifts are discussed. It is found that owing to the collision, each soliton has a negative phase shift in its traveling direction. Moreover, the characteristics of the phase shifts are found to be strongly affected by the above mentioned factors. The interaction between two (DASWs) in a three-dimensional magnetized dusty plasma which consists of variable-negative dust particles, isothermal electrons and two types of isothermal ions has been investigated theoretically using the extended Poincaré-Lighthill-Kuo (PLK) method. The analytical phase shifts after the interaction of the two solitary waves are derived. Accordingly, the effects of new parameters (i.e., oblique collision of DASWs and the ratio of the effective temperature of ions to the electron temperature) beside the above mentioned parameters are discussed. The results show that these parameters have strong effects on the phase shifts and the trajectories of two DASWs after interaction.