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This thesis contributed to the comprehensive study of the Finite-Difference Time-Domain method and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies. The work includes mainly three parts: the study on the performance of PML absorbing boundary condition applied to pseudo low frequency electromagnetic problems; the validation of the FDTD method with PML absorbing boundary conditions and the corresponding computer software based on the numerical study of the electromagnetic field of an electric dipole antenna, and its application to the numerical computation of radiated electromagnetic fields in switched mode power supplies; the development of an improved alternating direction implicit finite-difference time-domain method.

在综合前人工作基础上，本文对时域有限差分法及其在开关电源辐射电磁场数值计算中的应用进行了系统的分析和研究，其核心内容包括：伪低频电磁场数值计算中PML吸收边界条件性能的研究；基于基准问题—电偶极子天线三维辐射电磁场，验证了本文构造的基于PML吸收边界条件的三维FDTD法及其计算软件，并应用于高频开关电源辐射电磁场的数值分析；提出了一种改进的交替方向隐格式时域有限差分法。

The far end is an alternating series of fields and woods, fields and woods, threaded everywhere with motorcycle tacks—in whose bare clay wild turtles lay eggs.

池塘的远端是成片的耕田和树林，错落有致，有摩托车道交织其间，将它们隔开。常常会有野海龟在这些光秃秃的土路上产卵。

With the adoption of the rate-sensitive constitutive relationship, it is asymptotically investigated the propagating tip fields of antiplane mode III crack under the condition of incompressibility, and the dynamics equations are obtained separately governing the stress and strain fields at the crack-tip.

采用这种率敏感型本构关系，本文对不可压缩条件下反平面Ⅲ型扩展裂纹的尖端场进行了渐近分析，分别求得了其裂纹尖端应力和应变场的动力学控制方程。

With the adoption of the rate-sensitive constitutive relationship, it is asymptotically investigated the propagating tip fields of plane strain mode Ⅰ,Ⅱ and antiplane mode Ⅲ crack under the condition of incompressibility, and the dynamics equations are obtained separately governing the stress and strain fields at the crack-tip.

采用这种率敏感型本构关系，本文对不可压缩条件下平面应变Ⅰ型、Ⅱ型和反平面Ⅲ型扩展裂纹的尖端场进行了渐近分析，分别求得了其裂纹尖端应力和应变场的动力学控制方程。

Artificial grass playing fields first become common in the 1970s with the introduction of the now-iconic AstroTurf (both fields found to contain lead were produced by the AstroTurf company and were nylon variants, according to CNN).

Dr.eye：人造草室外运动场首先在20世纪70年代变得普通有现在 iconic AstroTurf(如果并且尼龙是变型，根据 CNN ，两个发现包含指示的领域被 AstroTurf 公司产生)的介绍。

Study on human balance function is getting attention in many fields, including the fields of medical, rehabilitation medicine, aviation medicine, sports and work security.

人体平衡功能的研究在许多领域受到重视，目前已涉及医学、康复医学、航空医学、体育运动和作业安全等领域。

Geologists may specialize in the following fields: coal geology, environmental geology, geochronology, geomorphology or surficial geology, geotechnics, hydrogeology, marine geology, mineral deposits or mining, mineralogy, paleontology, petroleum geology, petrology, sedimentology, stratigraphy or biostratigraphy, structural geology or tectonics, volcanology or in other fields.

地质学家可能会专注于以下领域：煤炭地质，环境地质，地质年代学，地貌或地表地质，岩土工程，水文，海洋地质，矿藏或采矿，矿物学，古生物学，石油地质学，岩石学，沉积学，地层学或生物地层，结构地质或构造，火山或其他领域。

Matching and bit reversal based on prediction arithmetic utilizes the relativity between continuous two frames/slices. It locates error position by setting a number of featured syntax fields and predicted values. The most perfect result is that the arithmetic can correct n+1 bits error by n featured syntax fields.

基于预测的匹配翻转算法充分利用时域上前后传输单位之间头部字段的相关性，通过设置特征字段以及其预测值来确定出错范围，进行纠错，理想情况下设置n个特征字段最高可以纠正n+1个比特错误。

Bstract The concept of agent, and therefore agent-oriented system or agent-oriented technology, firstly originated from distributed artificial intelligence , but it expanded DAI, walked into and blent with many other research fields during the end of 1980s, which leads to its widespread use in many fields different from the DAI.

gent及其相关概念和技术最早源于分布式人工智能，但从80年代末开始，Agent技术从DAI领域中拓展开来，并与许多其他领域相互借鉴和融合，在许多不同于最初DAI应用的领域得到了更为广泛的应用。

First, the linear combinations of basic set of solutions to Laplace equation under polar coordinate system are chosen as the approximations for the solution of temperature fields,boundary residual collocation method are applied to calculate the distribution of the temperature fields for single-particle model.

本论文主要完成了两方面的工作，一方面是采用加权残值法和边界元法对不同复合材料模型的2D稳态热传导的温度场进行了求解分析。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。