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In order to study the influence of defect on the surface acoustic wave,based on the theory of elastodynamics,the interaction between elastic surface acoustic waves and surface-breaking defect was simulated numerically by means of the finite element method.

为了分析材料表面缺陷对声表面波传播的影响，以弹性动力学理论为基础，采用有限元方法数值模拟了声表面波沿金属表面传播及其与表面缺陷的相互作用。

Based on the linear elastodynamics theory, an analytical model is established for the propagation of generalized Rayleigh waves in a coated structure. Moreover, the dispersion equation is derived from the wave motion equations and the boundary conditions.

基于弹性动力学的线性理论，建立了涂层材料中广义瑞利波传播的理论分析模型，并且由波动方程和边界条件推导了波的频散方程。

Chapter 2 is started from the basic theory of elastodynamics, the zero and the first order reflection and transmission coefficients of rough interface are derived in theory, and some numerical examples are given. Also dispersion characters of diffraction waves are discussed in the case of micro-rough interface in deep layers.

第二章从弹性动力学的基本理论出发，通过求解波动方程的定解问题，从理论上导出了地震波在粗糙界面上的零阶和一阶反射透射系数，并给出了数值算例；该章还讨论了深层微粗糙界面的绕射波的频散特征。

The study of dynamic interaction of foundations and grounds on half space is of great value to the development of the elastodynamics and is helpful on physical geography, seismography, and rock and soil mechanics, owning practical.This dissertation is based on the practical saturated governing equations of elastic waves in saturated soils established by Longzhu Chen,ect.

半空间上地基与基础的相互作用问题不仅对于弹性动力学理论的发展有重要的学术价值，而且在地球物理学、地震工程及岩土力学等工程问题中均具有重要的现实意义，有着广泛的应用前景。

Device for converting sound waves into electric power that has wave characteristics essentially similar to those of the sound.

将声波转换成电功率并保持其波形特性基本相似的装置。

Electrocardiograph an ECG uses sound waves to check the rhythm of the heart.

心电图 一心电图利用声波检查的节奏的心脏。

The brain, too, sends out brain waves of electricity, which can be recorded in an electroencephalogram.

这种细胞大量地连接在一起时产生的效果将是非常令人吃惊的。

In 1974 he developed a computer system which correlated brain waves on an electroencephalograph with specific commands.

在1974年，他开发一个电脑系统，它能关联脑电波在一个脑电图仪上，用特定的指令。

To allow brain waves, measured by electroencephalograph, to be analyzed by a computer instead of through a printout offers new possibilities of interpretation.

允许脑电波通过脑电图仪被测量，并通过电脑分析代替了打印输出，这提供了新的破译的可能性。

To allow brain waves, measured by electroencephalograph, topossibilities of interpretation. The charting of mental thoughts

允许脑电波通过脑电图仪被测量，并通过电脑分析代替了打印输出，这提供了新的破译的可能性。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。