The crystal oscillator is featured by small size ,low phase noise ,FM constant and wide range of temperature.
介绍了一种特种调频晶体振荡器的研制、设计,该种晶振具有体积小、相位噪声低、调频指数波动小、工作温度范围宽的特点。
The frequency index is equal to 1 for weak scattering,but it will be negative as scattering is Strong.
本文考查了行星际闪烁中闪烁指数随观测频率变化的规律，频率指数在弱散射时为１，而在很强散射时则为负值。
The variational rate of every population in SEIS epicemix model;
SEIS流行病模型中各类人群的指数变化率