ray approximation

The paper discussed four time-distance curve equation of seismic waves in vertical heterogeneous media; analyzed and compared the errors of ray paths and travel-time curves under the approximation of different velocity function in four layered media models;

本文讨论了四种垂向非均匀介质中地震波的时距曲线方程，分析比较了四类层状介质模型在不同速度函数近似下的射线路径和走时曲线误差；

False Scattering and Ray Effect in Spherical Harmonics Approximation for the Radiative Transfer Equation

球谐函数法求解辐射传输方程的假散射和射线效应

In addition, the ray effect in the spherical harmonics approximation mitigates with increasing optical thickness within gray medium.

同时，球谐函数法的射线效应随光学厚度的增加而减小。

Based on the ray approximation, the phase behavior of one-dimensional cavity with vibrating end is simulated. It is shown that phase becomes chaotic when parameter MN is larger than a certain threshold.

在射线近似下，单壁振动一维共振腔的相位变化数值模拟表明：当参数MN大于一定阈值时，相位变化呈混沌行为。