扑

These methods can make use of redundant switching status in order to make capacitors of different cells connect in parallel and to make energy transfer between adjacent cells in different switching status. Carrier phase-shifted PWM methods are further studied.

最后，本章提出了载波移相PWM方法对于新型拓扑的特殊意义，即采用移相控制，充分利用新型拓扑的各种开关冗余状态，通过变流器各级单元电容之间的并联状态补充能量，可以有效改善基波周期内各级单元的电容电压平衡问题。

XEX ~ Arg min{FIy E ~2} where the upper level is about topological structure optimization(a~ is a topological structure varable), and the lower level is a constrained programming about continuous variable y. 2 Apply graph, the action of permutation group on a graph, equiva- lent class, orbit etc.

取得的主要成果有： 1 依点到集的映射、集值映射、二元映射和分离定理等理论首次建立了具有拓扑结构双层规划的数学模型 min F s.t.x∈X y∈Arg min｛F|y∈Ω｝其上层规划为关于离散变量x的拓扑结构优化，下层规划是关于连续变量的约束规划。

The value of the Wiener Index for a class of linear phenylene molecular graph is calculated, and the linear recursive formulas is obtained, and then the exact expressions are gained by solving some difference equations of the recursions.

文章给出了一类一般线性聚亚苯基图hQ的Wiener拓扑指标的线性递推公式，通过求解差分方程而得到了它的Wiener拓扑指标的精确表达式。

A value of the Wiener index for a class of linear phenylene molecular graphhM is calculated, and a linear recursive formulas is obtained, and then a exact expressions is gained by solving some difference equations of the recursions.

给出了一类一般线性聚亚苯基图hM的Wiener拓扑指标的递推公式，通过求解差分方程而得到了它的Wiener拓扑指标的精确表达式。

This dissertation summarizes all kinds of topological relationships and spatial operations, and uses the conception realms to design the data structure of spatial region objects, and devises the red、blue planar graph algorithm, and makes use of red and blue sweep-line algorithm to implement the spatial topological analysis operations on layers of region objects. At the end, further works and improvements are presented.

本文 对空间拓扑分析操作进行了归纳总结，并且基于 Realms 概念探讨了空间区域对象的数据结构以及红蓝区域平面图算法，文章详细讨论了针对双层红蓝区域对象的各种空间拓扑分析算法的实现，最后是该类问题的进一步改进和构想。

GMODM is about the definition and calculation of geometric objects and topological relationships based on restrict plane graph. Geometric layer should be consistently maintained. This paper gives the algorithms.

它基于受限的平面图来定义几何对象和几何对象之间的拓扑关系，并给出了几何层的一致化定义以及一致化维护算法，它定义了几何对象的公共接口，使对几何对象的操作和拓扑关系的处理独立于几何对象表示。

The major technique to get the information of structure of those free groups is to sudy the action of automorphisms on them. In this paper we show that every normal automorphism of a nontrivial free product of groups is inner as well. Traub[16] made a purely algebraic conjecture and showed that it implied Poincare"s Conjecture. He also showed that Poincare"s Conjecture implied this algebraic conjecture modulo another topological hypothesis.

在本文中我们给出任意两个非平凡群的自由积的每个正规自同构也是内自同构的；在文献[16]中，Traub给出了一个纯代数的猜想并证明了这个猜想蕴含着着庞加莱猜想的成立，并且作者也证明了在一个拓扑假设的前提下庞加莱猜想也同时蕴涵着猜想1是成立的，后来这个拓扑假设被Waldhausen([7])证明是成立的。

Now we have more than twenty series products like powder puff, face wash puff, eye shadow brush.

主要产品：各式化妆粉扑、中高档洗面扑、眼影刷、卸妆棉、美容专用纸、美容面罩、眼罩、美容一次性套装等清洁及护理产品全部采用进口原料，引进目前世界最先进的日本生产线，以一流的质量，合理的价格，为同行业之佼佼者，生产粉扑、洗面扑、眼影刷等二十多个系列。

A novel regulated AC power supply unit for base stations using double PWM is presented in this paper. The main circuit and its principle of operation are introduced, and the power flow analyzed.

提出一种新的基于双PWM技术的新型通信基站稳压电源的拓扑结构，并对这种拓扑结构的主电路和工作原理进行了介绍，对其功率流进行了分析。

Based on twenty yearss research, Chen Lin developed the holistic processing hypothesis of Gestalt psychology into topology property perception theory, and thought of the human perception as a processing from holistic property to local property of perceptual object. From the viewpoint of Chen, a primitive and general function of the visual system is the perception of topological properties, and perceptual organization should be understood in the perspective of transformation and perception of invariance over transformation in the topological approach.

基于二十余年的研究积累，陈霖的拓扑性质知觉理论从格式塔心理学的整体加工思想出发，试图结合拓扑学的相关研究，对人类的知觉加工给出一个"大范围到局部"的说明，认为视觉系统的基本单元和一般功能是拓扑性质的知觉，知觉组织应当从变换和变换中的不变性知觉的角度进行理解。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。