Propagation characteristic of UHF radio wave in rectangle, circle and arched tunnels is studied in this paper and the computing equation for attenuation constant is deduced.
研究UHF频段的无线电波在矩形、圆形和拱形隧道中的传播特性，推导了衰减常数的计算公式。
The metastable propagation rate of crack is approximately a constant in a certain size range.
在一定尺寸范围内，裂纹的亚稳扩展速率近似是常数。
First, the relation between the dispersion of the fiber and the propagation constant and equivalent refractive index is presented.
文章先给出了光纤色散与光纤传播常数及等效折射率的关系。
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