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Starting from the fundamental wave equation for acoustics of moving media, a systematic study concerning the reflection and refraction of plane sound waves on the interface between two moving homogeneous media has been made under the assumption that the Mach numbers M of moving media are low, such that M2<<1. The representations for reflection and refraction coefficients as well as the equation decribing the total reflection zone are obtained. The processes have been extended to a "slowly varying" vertical stratified...

Starting from the fundamental wave equation for acoustics of moving media, a systematic study concerning the reflection and refraction of plane sound waves on the interface between two moving homogeneous media has been made under the assumption that the Mach numbers M of moving media are low, such that M2<<1. The representations for reflection and refraction coefficients as well as the equation decribing the total reflection zone are obtained. The processes have been extended to a "slowly varying" vertical stratified medium, and the W. K. B. solution and the successive modifications have been worked out.

本文从运动介质声学基本方程出发,在介质运动的Mach数低(M~2<<1)的条件下,对两种均匀介质分界面上的反射、折射和全反射问题作了系统的讨论,得到反射系数和拆射系数的表达式以及全反射区锥面的方程。进而对“缓变”的垂直分层运动介质作了类似讨论,求出声场的w.k.B.解和各次修正项。对于几何声学不再适用的全内反射区域内的场,用Gans的方法进行了研究,得出适用于该区域的解,它在区域的上、下界面与几何声学解相互联结。

The formula of BEM suited to solve the problems of wave propagation in boundless medium is obtained from numerical treatment of Kirchhoff integral equation. After quoting the coefficients of refraction and reflection of wave at surface or interface, the expression of BEM which is suitable for the problems of wave propagation in multi-isotropic mediums is also given.

本文从三维波动方程的Kirchhoff积分公式出发,首先经离散化给出无限均匀介质中的边界单元法公式.其后,在引入了波在不同介质面和自由面上的反射、折射系数以后,给出了三维波动方程在分区均匀介质中的边界单元法公式.

This paper mainly discusses the effects of reflection and refraction on the radiative transfer in water surface. A diffuse reflectivity formula is set with the internal reflectance in water surface and backscattering of water-body being considered. The sunlight glitter and the skylight glitter caused by rough water surface are discussed too.

本文主要讨论水面反射、折射等效应对辐射传输的影响。在考虑水表内反射和水体后向散射的基础上,推导出平静水面下的漫反射率公式。也讨论了起伏水面(由风力作用引起)所产生的太阳和天空光闪烁对可见光水体遥感的影响。

 
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