Model parameters have the important effects on three-dimensional distinct element code (3dec) modeling of the stress wave propagation and attenuation in jointed rock masses as well as other codes.
与其他数值软件一样，用三维离散元程序(3dec)模拟应力波在节理岩体中的传播和衰减时，模型参数对模拟结果有很重要的影响。
The propagation of wave packet produced from a point source in two and three dimensional incompressible boundary layer is investigated numerically on the basis of linear stability theory.
根据线性稳定性理论研究点源产生的波包在二维和三维不可压边界层中的传播特征。
Rayleigh wave propagation and dispersive curve in single layers semi-infinite space model and three dimensional road embankment are studied comprehensively by using finite difference software FLAC3D.
笔者利用有限差分软件FLAC3D，对单层介质半无限大体和三维路基体的瑞利波传播特性以及频散曲线进行了数值模拟分析；
Then the characteristics of frequency variation during the fatigue crack propagation process are simulated by three - dimensional dynamic finite element analysis.
并利用三维动态有限元模拟了点焊接头疲劳裂纹扩展过程中频率变化特性。
So the main work in this dissertation is compiling and debugging the program for solving the field distribution in channel waveguides using three-dimensional finite-difference beam propagation method.
为此，本文重点完成了利用三维有限差分束传播法求解条形波导中场分布的计算程序的编写和调试。
To contract the circular beam symmetrically, the co-propagation of the bright and dark beams in three-dimensional self-defocusing media is studied systematically.
为了获得一种对称压缩圆光束的方法，系统研究了三维自散焦介质中亮暗光束对的共同传输。
The three-dimensional finite-difference beam propagation method was used to compute the optical properties of fiber devices based on side-polished fiber.
本文还用三维有限差分光束传输法计算了侧边抛磨光纤波导的光学特性。
The analytical intensity distributions in the two specific cases are given, and the three-dimensional full-vector beam propagation method is used to verify the analytical results.
利用该耦合方程对空间三波导和四波导进行求解，得出场分布的解析表达式，并用三维全矢量光束传输法验证了分析结果。
Three-dimensional propagation properties of the flare-shock wave would bear close relations to the magnetic structure on the sun and the large scale structure in the interplanetary 'space.
耀斑-激波传播的三维特性与太阳黑子活动区，日冕及冕洞的磁结构有密切关系。
The purpose of the present paper is:(1)to build up a three-dimensional(3-D)model of simulating the propagation of circular Gaussina beam, simple and com-plex astigmatic Gaussian beam;
本文目的是：（1）建立模拟圆高斯光束、简单和复杂象散高斯光束传输的三维模型；
The three-dimensional discrete component process is applied to study the propagation course of explosive wave in rock.
采用三维离散元程序研究了岩体中爆炸波的传播过程。
This paper presents a three-dimensional propagation model for path-loss prediction in an urban microcell, based on ray-tracing techniques.
基于三维射线跟踪的微变网络方法和波前重建思路 ，提出一种适用于三维复杂介质地震波走时的快速算法。
This paper presents a three-dimensional propagation model for path-loss prediction in an urban microcell, based on ray-tracing techniques.
基于三维射线跟踪的微变网络方法和波前重建思路 ，提出一种适用于三维复杂介质地震波走时的快速算法。
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