1. The error estimation of the quasi-synchronous sampling harmonics anal-ysis and the method used for measuring the subharmonics of periodic signalsare also discussed.
   文中还对测量误差作了分析和估计,并介绍了测量分数次谐波的一种方法。
2. Resonance of surface waves of a given length is shown to be possible over bed waves with synchronous , subharmonic, or ultraharmonic wave lengths.
   针对定长入射流，得到一个自治动力系统，给出它的次谐波共振分叉图。

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