有不少的极性晶体，电子与体纵光学声子的耦合弱，但与表面光学声予的耦合强。
There is a weak bulk coupling but a strong surface coupling between the electrons and phonon for many polar crystals.
论文第二章研究了等离子体中横向扰动下的(3 + 1)维弱非线性离子声波，得到了描述离子声孤波的(3 + 1)维kp方程。
In chapter two, the (3 + 1) dimensional weakly nonlinear ion acoustic wave at higher order transverse perturbations in plasma was discussed and described by the Kadomtsev-Petviashvili (KP) equation.
推导了具有工程背景的弱正交异性材料的超声波斜入射应力-声关系。
The stress acoustic relationship for off axis ultrasonic wave is derived in slightly orthotropic material.
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