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通过使用推广的 Poincar-Lighthill-Kuo 摄动方法,研究了二维热离子等离子体中两个沿不同方向传播的离子声孤波的相互作用,得到了两个分别描述沿ξ和η方向传播的孤波的KdV方程以及两个孤波以任意夹角碰撞后的相移和轨道.同时还研究了离子温度比σ、热容比γ和碰撞夹角α对孤波相移的影响.研究表明,这些参量可以明显地改变孤波的相移,且在该系统中存在压缩型孤波.
关键词:
热离子等离子体
离子声孤波
Poincar-Lighthill-Kuo方法
相移 相似文献
55.
By means of the multiple-scale expansion method, the coupled nonlinear
Schr?dinger equations without an explicit external potential are
obtained in two-dimensional geometry for a self-attractive
Bose-Einstein condensate composed of different hyperfine states.
The modulational instability of two-component condensate is
investigated by using a simple technique. Based on the discussion
about two typical cases, the explicit expression of the growth rate
for a purely growing modulational instability and the optimum stable
conditions are given and analysed analytically. The results show
that the modulational instability of this two-dimensional system is
quite different from that in a one-dimensional system. 相似文献
56.
By employing the quantum hydrodynamic model for electron-ion-dust plasma,we derive a dispersion relation of the quantum dusty plasma.The effects of the dust size distribution on the dispersion relation in a cold quantum dusty plasma are studied.Both analytical and numerical results are given to compare the differences between the dusty plasma by considering the dust size distribution and the mono-sized dusty plasma.It is shown that many system parameters can significantly influence the dispersion relation of the quantum dusty plasma. 相似文献
57.
The longitudinal oscillation of a nonlinear elastic rod with lateral inertia are studied. A nonlinear wave equation is derived. The equation is solved by the method of full approximation. 相似文献