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1·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。

2·The normalized propagation constant, which determines the number of the modes and mode cutoff is obtained for a PCF: with a certain structure parameters.

对于给定结构的PCF，计算得到了决定模式数量及模式截止的归一化传播常数。

3·The propagation constant increases with decreasing slab thickness for the first-order oscillating mode, which is different from that in traditional metal-cladding waveguides.

一阶振荡导模的传播常数随着平板厚度的减小而增加，此性质与传统的金属包覆波导不同。

4·Then, the dispersion of the multi-clad fiber is obtained by solving the propagation constant and the equivalent refractive index of single-clad fiber which is equal to multi-clad fiber.

通过将多包层光纤等效为阶跃光纤，求等效阶跃光纤的传播常数与等效折射率，求得多包层光纤的色散。

5·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。

6·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。

7·On constant frequency ratio, loading ratio has an importance influence on the initiation and propagation of fatigue crack under double frequency complex loading.

在频率比确定的条件下，载荷比是影响双频疲劳裂纹萌生及扩展的一个重要因素。

8·By use of the angular-spectrum analysis and the Fourier transform method, a correction method is obtained to describe the propagation of few-cycle pulsed beam with constant beam waist.

利用角谱分析和傅里叶变换的方法，得到一种描述几个周期的等束腰宽度脉冲光束传输的脉冲修正方法。

9·In this dissertation, based on analysis for the combustion in a constant volume combustion bomb, the parameters such as combustion delay period, combustion-flame propagation have been investigated.

在对定容燃烧弹内火焰进行拍摄分析的基础上，研究生物添加剂对滞燃期，火焰传播的影响。

10·By using the concept of spatially induced group velocity dispersion, the propagation of Bessel-like pulsed beam which is constant beam waist in free space is studied.

利用空间诱导色散概念，从理论上研究了等束腰宽度的类贝塞尔脉冲光束在自由空间中传输性质。