The measurement error of differential absorption laser radar caused by the shift of its center frequency in measuring atmosphenc density has been discussed particularly.

详细地讨论了微分吸收激光雷达测量气体密度时中心频率的漂移所引起的测量误差。

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The influence of alumina addition on the bulk density, mechanical strength, activity and thermal stability of high temperature shift (HTS) catalyst was studied in laboratory.

实验室研究了添加氧化铝对中温变换催化剂堆密度、机械强度、活性和热稳定性的影响。

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It is shown that the phase noise spectrum density shift periodicity with the length of external cavity and the peak value of power spectrum density varies considerably with the feedback coupling rate.

这表明相位噪声功率谱密度随外腔长度而周期性地漂移，且功率谱密度的峰值随外部反馈耦合率而发生很大的变化。

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But some other areas on our list are benefiting from a hitherto unnoted shift of high-end services to lower-cost and often lower-density regions.

FORBES: The Cities Winning The Battle For The Biggest Growth Sector In The U.S.