结果表明，余弦形变幅杆共振频率的模态分析值与理论值比较吻合，平均相对误差为1.86%。
It is shown that the simulation result is consistent with that of the theory and the average relative error is 1.86%.
提出将互相关检测和混沌理论相结合应用于过电压监测中的频率跟踪，检测相对于中心频率极小的微弱信号。
The method which combines cross correlation detection with chaos theory to detect the weak signals relative to central frequency in overvoltage monitoring is proposed in the paper.
群体选择理论对此提出了一个解释，即尽管由于利他者相对于利己者处于不利的位置，利他者在每一个群体中的频率都会下降，但利他者在总体中的频率却有可能上升。
The theory of group selection proposed an explanation-even if the frequency of altruists is decreasing in every group of a deme, it can still increase in the whole population.
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