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。
2
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。
3
First, the relation between the dispersion of the fiber and the propagationconstant and equivalent refractive index is presented.