构造上的

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。

1 A German rendering of a Serbo-Croat term referring to the terrain created by limestone solution and characterized by a virtual absence of surface drainage, a series of surface hollows, depressions and fissures, collapse structures, and an extensive subterranean drainage network. 2 A type of topography that is formed on limestone, gypsum, and other rocks by dissolution, and that is characterized by sinkholes, caves, and underground drainage.

一个根据塞尔维亚－克罗地亚术语的德语，指石灰岩溶解形成的地形，特徵是：缺乏地表排水、一系列的表面空穴、凹陷和断裂、塌陷构造、和广阔的地下排水网络。2）一种地形，在石灰岩、石膏和其它岩石上溶失而形成，以灰岩坑、地穴和地下排水为特徵。

On the basis of the frame of dodecahedron, we apply the method of "spherical stretching" to the frame, we can obtain a novel polyhedron with I_h symmetry, which contains 72 pentagons.

我们在十二面体框架的基础上，利用&球面拉伸&的方法，得到新的具有二十面体对称性，72个五边形构造的的多面体结构。

Based on the analysis of available examples, the roof-base technology of traditional architecture in Suzhou area is classified as dry sheathing brick, polished sheathing brick, rebrushing sheathing brick and sheathing board according to their material and treatment. The treatment of material, corresponding component and structure, technological characteristics, field of application, as well as practical examples are introduced in detail.

为应对当前传统地方建筑工艺面临退化与消亡危机，本研究在整理分析现有实例的基础上，根据材料与材料处理方式的不同，对苏州地区传统建筑屋面工艺所进行的分类与归纳，将其分为清水望砖做法、做细望砖做法、反刷望砖做法及望板做法，并分别详述其材料的处理方法、相关的构件与构造、工艺特点、适用范围及实例等。

A software for aided designing bolt of tunnel named ANSYSBOLT was designed on the basis of ANSYS finite element software. In the software environment, bolt supporting model of physical tunnel in tectonic stress field was structured according to physical parameters of coal and rock seam of some working face, and in conditions of different buried depth, bolt supporting structure and pre-tightening force, distributions of stress of surrounding rock of physical tunnel and its displacement were analyzed and calculated by ANSYSBOLT software. Then influence of different buried depth, bolt supporting structure and pre-tightening force on stability of roof and floor of tunnel was analyzed and finally feasible scheme of bolt supporting was gotten according to the analysis result.

在ANSYS大型有限元软件基础上开发了巷道锚杆辅助设计软件ANSYSBOLT；在该软件环境下，根据某工作面煤岩层的物理参数，建立了构造应力场条件下的实体巷道锚杆支护模型，并按照不同的埋藏深度、锚杆支护结构和预紧力条件，经软件分析计算，得出了实体巷道围岩应力及位移分布情况，进而分析了不同埋藏深度、锚杆支护和预紧力条件对巷道顶底板稳定性的影响，最终根据分析结果得出了可行的锚杆支护方案。

Because of its complexity, analyzing and designing approach of nonlinear control system should be applied in the designing of FCS.

在Singh算法的基础上，可以将FCS设计中常用的两种动态逆的直接构造方法Lane和Snell的方法统一在Singh算法下，并指出它们仅是Singh算法的特例而已。

A smooth approximation algorithm is then proposed based on hinge-finding algorithm via curved faces approximated to the hinging hyperplanes model, which can obtain a smooth approximation result and hold some good properties of hinge-finding algorithm such as simplicity and effectiveness.

本文对找链接算法做了两点改进，其一是扩充了链接超平面模型，在二维空间上弥补了链接超平面模型表示能力不足这一弱点。仿真实验显示使用扩充后的模型得到了更好的分片线性逼近结果。另一点改进是使用双曲光滑函数构造出了基于找链接算法的光滑逼近算法。理论分析证明了算法的可行性。仿真实验验证了理论分析。

As we all know, the more points we have, the more can be constructed triangulations, and the city construction's details are show more. But now the point cloud data we collected existence of a large quantity and data redundancy, it would greatly enhance the time cost of the follow-up Grid Construction and other operating.

众所周知，在城市建筑物表面上取样点越多，可以构造出越多的三角片，越有利于呈现细致化的效果，但是现在机载激光雷达采集的点云数据量很大，数据有冗余，这样会大大增加网格构建的时间和其他后续操作的开销。

Along the mountains of Burma road in the Western Yunnan, special log cabins with unique Chinese characteristics can be found, which is very similar to the one in Scandinavia and Americas, especially the roof and the porch.

在滇西滇缅公路沿线山区，有一种特别的木屋，其构造与斯堪的纳维亚和美洲的木屋相似，但又具有某种地道的中国特色，尤其表现在其屋顶和门廊的处理上。

Based on Fermat's principle and light path function, it gets the spectral distribution of the incident rays, and it can get the ray tracing map through a matrix method.

在费马原理的基础上利用光程函数法得到入射光通过光栅后的光谱分布情况，再使用传输矩阵的计算方法构造出光谱的点列图。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。