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.
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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