During storage or in operation the frequency of the crystal resonator will change according to the duration period, which is define as aging in crystal field.
石英谐振器在贮存、使用过程中频率随时间变化的现象称为老化。
A method to detect vacuum degree using crystal resonator had been investigated, and resonant frequency of crystal resonator could be stabilized after two days aging test at least.
研究了一种利用晶振测量 真空度的方法，经试验，至少经两天老化后晶振的共振频率才能稳定；
In this paper, the aging failure mechanism of HV ceramic capacitor under high frequency discharge and recharge is studied and a series improving methods are put forward.
本文对高压陶瓷电容器在较高频率充放电作用下的老化破坏机理做了较为深入的研究，并提出一定的改进措施。
Method We studied the frequency domain of 63 aging patients with the disease of diabetes combining hypertension (with LVH and without LVH), comparing with that of control group respectively.
方法对63例老年糖尿病合并高血压患者(分为不伴有LVH组和伴有LVH组)，分别与对照组进行频域指标分析对比。
Method We studied the frequency domain of 63 aging patients with the disease of diabetes combining hypertension (with LVH and without LVH), comparing with that of control group respectively.
方法对63例老年糖尿病合并高血压患者(分为不伴有LVH组和伴有LVH组)，分别与对照组进行频域指标分析对比。
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