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As the foundation of ultrasonic testing of composite materials, this thesis is intended to explore in detail a number of features of wave propagation in anisotropic plates, and the following essential problems will be considered:(1) Propagation of plane bulk waves in homogeneous and orthotropic anisotropic media;(2) Lamb wave propagation in multilayered anisotropic plates;(3) Influence of isotropic solid or liquid loading on Lamb wave propagation in anisotropic solid media;(4) Influence of interface layers on Lamb wave propagation in layered anisotropic composite laminates;(5) Dispersion characteristic analysis of attenuation Lamb wave while existing an thin viscous layer which is used for simulating the poor curing in adhesively bonded joints.

作为复合材料超声检测的基础,本文研究了如下国际前沿性的课题:(1)平面体波在正交均匀各向异性媒质中的传播;(2)多层各向异性媒质中Lamb波的传播;(3)各向同性固体或液体负载对各向异性固体媒质中Lamb波传播的影响;(4)界面层对层状各向异性复合媒质中Lamb波传播的影响;(5)胶粘剂未固化而呈现粘弹性时粘接结构中衰减Lamb波的频散特性分析。

This essay, from a correspondent report A Legal Execution in Center China——Revelation of Zhang Jinzhu Case written by Chen Zhong, shows the difference between the communication of correspondent report and that of other media , so as to show the distinctive communication aspects of correspondent report, such as long-life, full-aspected, imperturbability, big capacity, and narration.

从沉钟的报告文学《问"法"中原——张金柱案件启示录》为切入点,探讨报告文学传播不同于其他媒体传播的特性,如"长寿性"、全面性、冷静性、大容量以及故事性等,以此揭开报告文学独特的新闻传播世界。

In order to evaluate the effect of strengthened mass media of health education on STD/AIDS,we made an interstage, intergroup vertical and parallel comparison between strengthened STD/AIDS information broadcasting areaand unstrengthened area applying local newspapers, radios, TV,etc.

为了评价大众传媒强化传播性病艾滋病信息的干预效果,采用本地报纸、广播和电视等传媒在实验地区强化传播STD/AIDS信息,与未进行强化传播的对照地区进行组间、期间垂直平行对比研究。

The propagation matrix method used widely in stratified media is extended to laterally inho-mogeneous media,and a numerical method known as generalized propagation matrix method for simulating elastic seismic wave propagation in inhomogeneous media is presented by using mixed variable elastic wave equation and matrix exponent solution of system of linear ordinary differential equations.

应用混合变量弹性动力学方程和线性常微分方程组的矩阵指数解法,将层状介质中广泛应用的弹性波传播矩阵解法推广至横向非均匀介质,给出了一种可计算复杂地质体中弹性波传播的广义传播矩阵数值解法。

At the beginning of the dissertation, the author explained some main concepts and methods, in addition, the major concerns of the social background of Ming and Qing Dynasty and basic spreading characteristics of "Xixiangji". Social pastime and social position of traditional opera turned from vulgar to elegant formed the direct reason of the prosperity of Ming and Qing traditional opera. During the time the general characteristic of the spreading of "Xixiangji"can be concluded as follows: wide-spreading. Chapter Ⅰ, study of the play.

本文的前言部分,除了按照惯例,对课题的提出、研究方法以及一些概念加以说明和论述之外,我们主要针对明清时期的社会背景和《西厢记》传播的基本特点加以探讨和介绍,认为社会的娱乐风气和戏曲文学的社会地位由俗到雅的提升是构成明清戏曲传播繁荣兴盛的直接因素;明清时期《西厢记》传播的总体特征可概括为:受众多、传播时间长、分布广。

In the first chapter, the rising of environment protection communication and its oversea and domestic development are expatriated.

在文章的第一章,阐述了环保传播的产生过程以及环保传播在国际、国内的发展概况,并对环保传播概念做了界定。

For strong disturbance case in which Δp is set to be 5, by examining the distributions of relevant physical quantities along radial direction and the normal of wave front, we can infer that the slow wave introduced by the strong pressure pulse steepens into slow shock during the propagation process.

与二维情形类似,沿由源区出发的径向,可以分辨出压力脉冲增长相所引起的前导快波与后随慢波的传播,同时还可观察到压力脉冲恢复相所导致的快模磁声波的传播,由于传播速度的差异,该波动在向外传播的过程中逐渐超过后随慢波。

Two-dimensional percolation lattices are used to describe urban wireless propagation environment, and random walks are employed to model radio wave propagation. The probability that a generic ray undergoes certain number of collisions at specific spatial location is derived from the Bernoulli equiprobable experiments and the maximum entropy principle.

使用二维渗流网格描述城市无线传播环境,使用随机游动过程对在该环境中传播的无线电波进行建模,在此基础上分别使用Bernoulli等概率试验和最大熵原理方法计算随机射线在传播空间的概率分布。

In section one, by using FICE scheme and TIME-GCM, a model of trace gases and OH airglow affected by gravity wave is set up, then the propagation of nonlinear gravity wave and the effect on trace gases and OH airglow are analyzed. The result shows gravity wave excited by tropospause forcing can propagate stably to the mesosphere through the stratosphere so that energy and momentum can be transferred from one region to another. In this process, gravity wave undergoes growth, overturning, convection and breaking. And the no-isothermal structure can accelerate the breaking of gravity wave in mesospause, and the breaking of gravity wave is an important source of convection and small-scale waves.

在第一部分的工作中,利用全隐欧拉格式和全球热层-电离层-中间层-电动力学环流耦合模式,对重力波的非线性传播及其在传播过程中对中高层大气中氧族和氢族成分和与之密切相关的OH气辉辐射的影响进行了数值模拟,结果表明,从对流层向上传播的重力波经历了产生、发展、饱和、对流产生直至破碎的非线性演化,大气的非等温结构加速了重力波在中层顶区的破碎,重力波的非线性传播是小尺度对流和湍流产生的一个重要的源。

In section one, by using FICE scheme and TIME-GCM, a model of trace gases and OH airglow affected by gravity wave is set up, then the propagation of nonlinear gravity wave and the effect on trace gases and OH airglow are analyzed. The result shows gravity wave excited by tropospause forcing can propagate stably to the mesosphere through the stratosphere so that energy and momentum can be transferred from one region to another. In this process, gravity wave undergoes growth, overturning, convection and breaking. And the no-isothermal structure can accelerate the breaking of gravity wave in mesospause, and the breaking of gravity wave is an important source of convection and small-scale waves. The propagation of gravity wave will affect the distribution of minor species.

在第一部分的工作中,利用全隐欧拉格式和全球热层-电离层-中间层-电动力学环流耦合模式,对重力波的非线性传播及其在传播过程中对中高层大气中氧族和氢族成分和与之密切相关的OH气辉辐射的影响进行了数值模拟,结果表明,从对流层向上传播的重力波经历了产生、发展、饱和、对流产生直至破碎的非线性演化,大气的非等温结构加速了重力波在中层顶区的破碎,重力波的非线性传播是小尺度对流和湍流产生的一个重要的源。

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I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

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起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像,后来回台湾,甚至去年在北京,居然也四处看见她的海报,才惊讶她的魅力之大。

Ah may dee:You are chinese living in a democratic country.

你是居住在民主国家的中国人吧。