There isa weak bulk coupling but a strong surface coupling between electrons and phonons for many ionic crystals.
有不少极性半导体，电子与体纵光学声子的耦合弱，但与表面光学声子的耦合强。
There is a weak bulk coupling but a strong surface coupling between the electrons and phonon for many polar crystals.
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。
And the impulse coupling coefficient is not sensitive to nozzle length and the distance between ignition zone and inner surface of nozzle.
而冲量耦合系数对点火区与聚光系统内表面的距离及喷管长度等参数并不十分敏感。
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