当定时器计数值达到0(超时)，内部复位信号有效。
Internal reset signal is activated when the timer count value reaches 0 (time-out).
进一步考虑了发射源的指向性以及环境噪声的因素，同时分析了发射信号有效宽度对接收器检测性能的影响。
The directional source and environmental noise are further considered, and the effects of the effective length of transmitted signal on the receiver performance are investigated.
研究指出，传统方法确定的层裂强度测定方程仅仅可能对采用瞬时层裂准则得到的数值模拟的层裂信号有效。
It is indicated that the spall strength equations determined by the traditional methodology are valid only for the numerically simulated 'pullback' by a local instantaneous critical stress criterion.
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