Under the weak beam conditions, there are four ion acoustic wave modes, of which, two correspond to the slow and fast solitary waves.
在弱束流的条件下，四种离子声波模式中有两种分别对应慢孤波和快孤波。
The coupled equation of two-wave mixing and expressions for weak beam amplification in a single mode waveguide are deduced by application of coupled wave theory.
本文利用耦合波理论分析推导了单模平面光波导中两波混合的耦合波方程和弱相干光放大率的表示式。
The thin ribs applied in the back reinforcing structure can not only effectively improve the intensity of the weak beam, but also avoid sink marks on the front side of the beam.
本实用新型的背部加强结构薄筋既可以使弱梁的强度有效的增加，又可以避免弱梁的正面不出现缩痕。
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