The paper studied the issue of low frequency in shallow parts of cross-hole seismic reflection sections using imaging principle and deduced frequency variation factor.
本文利用成像原理对井间地震反射剖面的浅部频率变低问题进行了研究，导出了频率变化因子。
Based on T type filter, the new ballast can achieve a wide dimming range with a very narrow frequency variation range, and it can operate with low lamp current crest factor.
基于T型滤波器的调光方法，能在很窄的工作频率范围内实现深度调光，同时具有灯电流波峰因数低的优点。
The variation of temperature coefficient of resonator frequency with tolerance factor was discussed.
分析了谐振频率温度系数随容忍因子的变化关系。
The variation of aerodynamic parameters of cascade NACA0012 and PROF under different reduced frequency shows that the reduced frequency is an important factor that influences the flutter.
NACA0012和PROF叶栅在不同折合频率下气动参数随时间的变化表明，折合频率是影响叶栅颤振的重要因素。
Therefore, the frequency variation due to a factor other than the adsorption of the object is cancelled.
因此，由于探测对象物的吸附以外的原因引起的频率变化被抵消。
With the different frequency, the variation regularities of reliability factor sensitivity were discussed.
探讨了不同频率比下，可靠性指标灵敏度的变化规律；
With the different frequency, the variation regularities of reliability factor sensitivity were discussed.
探讨了不同频率比下，可靠性指标灵敏度的变化规律；
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