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In the process of building and using the mass concrete structures, because of the effect of out-side condition and themselves, some faults will form in the structure, these faults will effect the bearing capability and endurance Using nondestructive testing method to test the concrete"s quality and diagnose its healthy, which has the significant sense in assessing the safety stability and research of the administering diseasesThis dissertation mostly researched the testing methods in the mass concrete structure, discussed the principles, methods, features, sphere of application of the ultrasonic testing in the mass concrete structure with faults, used dynamic FEM to simulate the testing process, discussed when the concrete structure with cracks is under the effect of the pulse, how the elastic waves propagate and what are their changing feature, Researched the principles of the first-arriving waves" phase when the cracks" depths are not same, obtained the relation between the inversion point and the cracks" depth, which has the direction sense in the application of projects,The second part of this dissertation is CT , which used the ultrasonic wave running through the tested-substance to get arriving-time of the ultrasonic wave, then inverse the image This dissertation drawed one CT program which can well present the different little cells ultrasonic wave velocity profiles of the substance, thereby to diagnose the quality of the part of the tested-substance, CT has the better using foreground..

在混凝土结构的施工及使用过程中，由于受其自身及外界各种因素的影响，常常会产生一些缺陷，对结构物的承载能力和耐久性造成严重影响，采用无损检测技术进行质量检测和健康诊断，这对混凝土结构开展安全、稳定性评估以及病害隐患治理研究具有重要意义。本论文主要针对大体积混凝土结构缺陷的检测方法展开研究工作，重点讨论了超声波法检测混凝土结构裂缝的基本原理和方法及其特点、适用范围，运用动力有限元数值模拟其检测过程，探讨了有裂缝缺陷的混凝土结构在脉冲荷载作用下弹性波的传播及其变化特征，研究了不同裂缝深度下首波相位变化规律，得出了反转临界点与裂缝深度之间的关系，这对实际工程应用具有指导意义。声波CT是一种新的无损检测技术，它是利用声波穿透被检测体获取声波接收时间，来进行计算机反演成像的技术。本文利用直射线法编制了层析成像程序，能较好地呈现被检测物体各微小单元的声波速度分布图像，从而对检测体的质量状况作出诊断评估，具有较好的应用发展前景。

An availible hydrodymanic code was developed to simulate laser-produced plasmas. Simulated results of laser-produced Al plasmas is in good agreement with the experimental data.

课题组还发展了现有的一维辐射流体力学模拟程序，对三倍频激光入射盘靶进行了数值模拟，并与汤姆逊散射得到的实验结果进行了比较。

The theoretical research on probability theory and random process and the practical applications show that the class normal distribution is most widely distributed in actual natural phenomenon and social phenomenon, cloud model is a powerful tool in simulating class normal distribution, controlling particle generation and particles attribute alternation of the particles system based on the cloud mode will simulate the natural rain more realistically, and has more fidelity effect.

概率论与随机过程的理论研究和实际应用表明，类正态分布在实际的自然现象与社会现象中分布最为广泛，云模型是模拟生成类正态分布的有力工具，基于云模型控制粒子系统的粒子生成、属性的改变能够更真实地模拟自然雨的生成，具有更逼真的效果。

The signal returned from sea surface is then computed by employing radar equation and synthetic processing to simulate sea surface echo wave.

然后根据雷达方程和合成孔径高度计的合成孔径处理计算了海面回波信号的矩阵，以便给出最终的功率回波。

In order to verify the accuracy of heat transfer coefficient,2D nonlinear finite element axisymmetric model is established by the means of finite element software MSC.Marc, which is utilized to simulate the transient temperature field coupled with phase transformation process and nonlinear synthetic surface heat transfer coefficient of several typical steels in the different quenchants.

Marc作为模拟平台，建立了淬火过程二维非线性有限元模型，模拟淬火过程中的瞬态温度场，在模拟过程中以多种常用钢在不同淬火介质中的非线性表面综合换热系数为边界条件，同时耦合了相变过程的影响。

In order to precisely simulate the complicated mechanical behavior of concrete so as to accurately modeling the real complex concrete structures, a novel concrete constitutive model, which is referred as microplane model, is introduced in this paper and integrated into the general purpose finite element software of MSC.

目的 为了能准确模拟混凝土的各种复杂力学行为，从而对复杂应力混凝土结构进行准确分析。

Based on the multi-layer shell element model that is now widely used in the nonlinear analysis for the shear wall structure,different constitutive models of concrete and reinforcement are discussed in this paper.Selected in this discussion were two models:a new constitutive model for concrete,referred as microplane model,which could precisely simulate the nonlinear behaviors of concrete under complicated stress conditions,and a constitutive model for reinforcement,which could accurately modeling the hysteretic behaviors of the reinforcement.Some shear wall tests were analyzed to demonstrate the precision of the proposed model.

在适用于剪力墙结构非线性分析的分层壳墙单元模型基础上，对其中的混凝土本构模型和钢筋本构模型进行讨论，采用一种能较好的模拟混凝土在多轴复杂应力状态下特性的microplane模型和一种能够全面反映钢筋在往复载荷下各种复杂受力特性的钢筋本构模型，分别模拟混凝土和钢筋的力学行为特征。

The theory of multibody system dynamics is used to simulate valve trains' kinematics and dynamics characteristics, and the methods of establishing and analyzing the multibody system dynamics model for valve trains are discussed.

运用多体系统动力学的原理来模拟配气机构的运动学和动力学特性，讨论了配气机构多体系统动力学建模和分析的方法。

This paper discusses the operation procedures in using Flash to simulate medical chemistry experiment,"determining the content of sodium citrate injection with ion-exchange technique": movement animation,shape-shift animation,key-frame animation,word processing,and sound disposition.

通过应用Flash模拟医用化学实验-离子交换法，测定枸橼酸钠注射液浓度的制作过程，介绍了运动动画、形变动画、关键帧动画和文字处理及声音配置等操作步骤。

In the paper, a coherent video signal simulation is applied to model and simulate a pulse Doppler radar seeker.

本文采用相干视频信号仿真方法对脉冲多普勒雷达导引头进行了建模和仿真研究。

Putt your way through 36 fun-filled holes of minigolf on 3D designed courses with elevated greens, bunkers, bridges and water hazards, among other crazy obstacles.

您的推杆方式，通过36个有趣的填孔迷你的三维设计的课程，以提升绿党，掩体，桥梁和水的危害，除其他疯狂的障碍。

Some participles can be used either as attributes or as predicatives.

有些分词既可当定语用，也可当表语用。