通过调整输入采样速率和输出数据速率的频率比(ratio of the frequency),可直接影响有效位数;只要增加每个输出结果的输入采样次数,有效位数也会增加,使得模拟数字转换器的有效分辨率因此提高。
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由碰撞频率、速率与球磨工艺条件的理论关系推导出了球料比的最佳值。
The optimum value of ball-to-powder weight ratio has been deduced from theoretical relationship between frequency, speed of collision and ball-milling conditions.
DDS的优点是具有极高的分辨率、频率转换速率快、相位噪声低等；缺点是杂散度抑制比性能差，很难做到- 65 d B。
DDS has both the advantages of high frequency resolution, rapid frequency change rate and low phase noise and the disadvantage of bad spur suppression performance with Max value of -65 dB.
结果表明，循环载荷下的裂纹扩展速率对试验频率、载荷比、温度及橡胶夹层厚度反映较敏感。
It was shown that crack growth rate increased as the temperature or limit load rate increased. It was also that crack growth rate decreased as rubber thickness and loading rate increased.
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