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With PWM control chip L4981A, the bridgeless AC/DC topologic circuit is constructed. Its principal is analyzed and simulated with PSpice, its design process is introduced,and the experimental result is shown.

通过高功率因数PWM控制芯片L4981A，构建桥式AC/DC拓扑电路，分析了其工作原理并进行了系统仿真，叙述了拓扑电路的设计和参数选取过程，最后给出了样机实验结果。

Then it describes the properties of topological transformation in map data processing as well as the realization of so-called indirect topological selection in this cartographical data base system.

然后就地图数据处理的拓扑变换性质以及在该地图数据库系统中称之为&间接拓扑选取&的实现进行了论述。

Utilizing the topological structural theory,an analysis was carried out on the linking relation and constraint relation between key components of the prototype vehicle suspension frame system.The topological configuration of suspension system was established,and the performance calculation analysis on key compone...

运用拓扑结构理论，对原型车悬架系统关键零部件间的连接关系、约束关系进行了研究，建立了悬架系统的拓扑构型，并对悬架系统关键零部件进行了性能计算分析，为转矩套管式悬架系统的深入研究与开发奠定了理论基础。

A conjugation small molecule containing both 3T moiety and diacetylene moiety is synthesized. It will be interesting to investigate the potential application in FET of the cubic organic semiconductor formed by topology polymerization.

合成了含有三聚噻吩(3T)和可引发拓扑聚合的双炔官能团的小分子光电材料，成膜后引发拓扑聚合形成&体型&聚合物半导体材料，探讨它在场效应管中的应用将是很有意义的工作。

The topology models of MFIand MOR were built and the method of Configurational-bias Monte Carlosimulation was used for investigating the adsorption and distributions of ethanethiolas adsorbate in MFI and MOR type zeolites. The diffusion of ethanethiol in MFI andMOR type zeolites was studied by molecular dynamics simulation.The results show, the concentration of Zn2+ is the most important factor of theloading quantity of zeolite 13X and alumina, and the temperature secondly. The pHvalue which range from 2 to 3 effects on the loading quantity faintly.

构建了MFI 和 MOR 两种拓扑结构沸石的数学模型，以乙硫醇分子作为被吸附的目标物，采用偏倚蒙特卡罗方法模拟乙硫醇在MFI和MOR沸石上的吸附行为及分子分布密度，并利用分子动力学模拟乙硫醇在这两种拓扑结构的扩散行为，为实现面向硫化物进行吸附剂的微观结构设计作初步探索。

Through analyzing the research result of four series studies, we conclude that the description about toplogical perception that is prior to the perception of local featural properties does not fit to the visual perception, and the figure visual perception is not affected by the different geometrical levels, and the relative perceptual salience of different geometrical properities is not consistent with the hierarchy of geometries according to Kleins Erlangen Program.

四个系列研究的研究结果表明，陈霖的拓扑性质知觉理论对视觉系统具有早期抽取图形拓扑性质的描述欠妥当，图形视知觉的加工过程并不受图形几何变换功能层次的制约，不同几何性质的相对知觉显著性与克莱茵的埃尔朗根纲领所描述的几何层次不一致。

I went out of my house yesterday evening, a black shadow pounce on me suddenly, formerly it's a shepherd dog just feeding by my neighbor, although I have strong body but also be frightened standing on ground flatling, the neighbor said: Nothing, nothing ,it 's not bit you!

昨天傍晚在我家小区刚出单元门，一个黑影直扑过来，原来是邻居刚刚领回来的一条半人高牧羊犬，虽说我人高马大，但这一扑，冷不丁的把我也惊住了，就直愣愣地挺在地上，邻居嘴里直说：没事，没事，它不咬人！

I can hear a bird fluttering in the chimney.

我听见一只鸟在烟囱里扑扑地拍翅。

After power-law being represented,some network topology models emerge.But these models do not involve any reference to underlying geometry.In order to solve this problem,this paper proposes an improved network topology model based on heuristically optimized trade-offs,which generates topology with the power of law,and has an appropriate amount of leaf nodes.It is closer to the real characteristics of the Internet.

幂法则提出以后，出现了一些符合幂法则的网络拓扑模型，但是这些模型没有充分考虑到底层节点的几何排列，针对这种情况，提出了一种改进的&启发式最优化平衡&网络拓扑模型，生成的拓扑图符合幂法则规律，且具有适当数量的叶子节点，更加接近互联网真实特征。

Based on the operation rules of generalized multiplication and generalized addition,the improved Gaussian elimination algorithm is applied in power system topology analysis,meanwhile the sparse technique and sectionalization technique are introduce to raise efficiency of topology analysis.

根据广义乘法和广义加法的运算规则，将改进的高斯消元算法应用于电力系统拓扑结构分析中，并引入稀疏、分块处理等技术提高了上述拓扑分析的效率。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐