查询词典 wave propagation

In the text, the Spectral element method is used to model the seismic wave propagation, which is based on a weak formulation of the elastic mechanics equation. It combines the geometrical flexibility of the Finite element method and the accuracy of the pseudospectral method.

本文采用谱元法对横向同性介质中的地震波进行模拟，该方法基于弹性力学方程弱形式基础之上，具有有限元适应任意复杂介质模型的韧性和伪谱法的精度。

Week 8 - Geometrical optics, wave propagation 1 hr, in class

第八周－几何光学、波的传播

Phase velocity and group velocity are important characteristics of elastic wave propagation.

相速度、群速度是弹性波传播的重要特征。

This pattern may be applied to problems such as heat flow and wave propagation.

该模式适用于处理热流和波传播问题。

The classical elastic theory is precisely based on the Hooke's law, and issuitable to the depicting and describing of seismic wave propagation in the elasticmedia. But either from the experimental results of testing on the core, or from thepractical results of exploration and exploitation in the oilfield, the subsurface mediumshows more or less the non-elastic characteristics, namely viscoelastic behavior.

经典的弹性理论是建立在精确遵守虎克定律的基础之上的，弹性波动理论适用于对弹性介质中传播的地震波的刻画和描述，但是无论是对地下岩芯的实验室测试，还是油田的勘探开发实践，都已经证实地下介质或多或少地表现出非完全弹性，即粘弹性行为。

The modeling results show that the velocities of wave propagation are significantly different in different directions, and the property of the fracture infill has a large effect on velocity anisotropy.

结果证实各向异性介质中波的传播速度随传播方向的不同而产生明显的差异；裂隙填充物的性质对于速度各向异性具有很大的影响。

The basic properties of elastic wave propagation in quadratic inhomogeneous damage materials are discussed by examples.

介质中的波的传播理论在国内外已得到广泛的研究[4-6]，但以往的文献大多研究的是均匀介质或分层均匀介质中的波的传播问题[7]。

The distribution of thermoacoustic field under different irradiate frequency was analyzed. And the same time, we observed the process of sound wave propagation in biological tissues.

分析了不同频率微波照射下模型组织内热声场的分布，并模拟了声波在组织内的传播过程。

Based on the small steepness parameter, three-layer incompressible, inviscid and irrotational fluid system of arbitrary depth is discussed by using the perturbation method, and a unified theory of nonlinear interfacial-internal wave propagation and the approximate nonlinear evolution equations for interfacial-internal elevations are given on the basis of the rigid upper boundary and the flat impermeable bottom.

基于波陡很小的假设下，利用摄动法，讨论了任意深度的二维不可压缩、无黏性、无旋的三层流体系统，在刚性上边界、平底不可渗透条件下，给出了界面内波传播的统一理论以及描述界面内波波剖面的近似非线性演化方程，最后还讨论了几种特殊情形下的近似非线性演化方程。

The stability of algorithm, the condition of absorbing boundary and free surface boundary, the grid dispersion and the process of source are discussed in details. The numerous simulations of wave propagation are carried out in isotropic media, transversely isotropic media and anisotropic media induced by fractures. The difference between anisotropic and isotropic effects on surface records is analysized.

接着讨论了有限差分算子的稳定性和收敛性，以及吸收边界条件、自由边界条件、数值频散和震源的处理，对各向同性介质、横向各向同性介质以及裂隙引起的各向异性介质中传播的弹性波场进行了数值模拟，分析了多波多分量数据中的各向异性效应以及各向同性在地表地震记录中的反映。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。