针对怎样抑制周期性干扰，文献中报道较多的是LMS自适应滤波方法，但该方法需调整参数多，对脉冲型干扰表现出不稳定性。
Aiming at how to prevent periodic interference, more papers have covered LMS adaptive filter, which needs to adjust many parameters and shows instability in pulse type interference.
根据两种田鼠种群波动周期性、波动峰值出现的时间以及特定年份峰值的高度等特征，证明两物种波动均具有不稳定性。
Population fluctuations of both species were erratic in respect to annual occurrence, the time of the peak density of fluctuations within years, and the hight of peak the density a given year.
本文还定量分析了海底土体对波浪周期性荷载的动力响应，并对其不稳定性机制进行了探讨。
This article quantitatively analyses the dynamic response of seafloor soil under the cyclic loading of waves and discusses the instable mechanism of soil.
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