As for the choice of the microwave irradiation frequency, the trade-off must be made in order to insure the penetration depth of the microwave signal, imaging contrast and signal-to-noise ratio.
为了同时兼顾穿透深度、成像对比度和信噪比三方面的需要，选择微波辐照频率时应该采取折中选取的原则。
By the analysis penetration of ZnOw into the compound board will compose a microscopic damping structure, which can reduce the vibration frequency and increase the damping ratio.
分析认为，氧化锌晶须渗入在复材中将形成微观的阻尼结构，起到降低固有振动频率和增大衰减率的作用。
Manipulate frequency, the maximal stenosis and horizontal penetration parameter are the important parameters of the rolling massage in Chinese traditional medical massage.
手法频率，血管最大狭窄度和作用力水平渗透系数，是中医扌衮法推拿的重要参数。
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