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根据特高频信号传输衰减原理进行衰减-吸潮性试验。
Attenuation-moisture test was carded out based on the principle of UHF signal transmission attenuation.
介绍了空气耦合非接触式超声检测技术基本原理，推导了该技术中信号传输衰减理论构成因式。
With the brief description of the basic principle of air-coupled non-contact ultrasonic testing, the factors affecting the whole signal path losses of air-coupled ultrasonic testing are deduced.
针对双总线形、星形、环形和双环形四种光纤网络拓扑，比较它们的光纤需求长度、平均传播延迟、传输衰减、最大比特率及容错。
The comparison is in term of fiber required, average propagation delay, transmission loss, max bit rate, fault tolerance among four type topologies included bus, star, ring and dual ring.
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