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Synthesis and liquid crystalline behavior of three recently reported mesogenic block-molecules,namely polyhydroxy 1-benzoylaminopropane-2,3-diols Ⅰ,star-shaped pentaerythritol tetrabenzoates Ⅱ and calamitic bolaamphiphiles with lateral chains Ⅲ which are constituted of anisometric block,amphiphilic block and alkyl or perfluorinated chains with different topologies are reviewed in this article.

这些分子由各向异性嵌段、两亲性嵌段和烷基链以不同的拓扑形式组合而成，其合成的关键步骤是Pd(0)催化下碘代全氟烷烃对双键的自由基加成反应以及Pd(0)催化的偶合反应。

Using two kinds of representative bridgeless PFC topologies as main circuit and IR1150 as control chip, two bridgeless PFC prototypes have been designed and the EMI of the two circuits has been tested.

采用两种比较有代表性的无桥拓扑作为主电路结构，控制电路采用单周控制芯片IR1150，设计了试验样机，并对两种PFC电路的EMI进行了测试分析。

And a series of new control type soft switching topologies, such as Buck, Boost, Buck-boost, Cuk, Zeta, Sepic, Flyback, and Forward are constructed by using the theory of five characteristics.

接着应用 5 个特征理论推导和构造出Buck、Boost、Buck-boost、Cuk、Zeta、Sepic、Flyback、Forward等一系列拓扑的控制型软开关的实现方法。

The MAX15054 enables designers to avoid the cost and complexity of a SEPIC topology by allowing the implementation of buck and single-inductor buck-boost topologies with the output referenced to ground in single string and multistring LED drivers.

MAX15054在单串和多串LED驱动器中通过使用降压以及单电感升降压拓扑结构，并将地电位作为输出电压的参考点，从而使设计人员避免了采用SEPIC结构带来的成本和设计复杂度。

Network'.'' design topologies: point to point, arbitrated loop and switched fabric.

网络'。''设计拓扑结构：点对点、仲裁环和交换结构。

The topologies of the 2D periodic lattices are analyzed together with their manufacturing methods.

综述了格栅复合材料的周期构型特征和格栅结构的制备工艺。

Through theoretic reckoning and simulating analyzing, several control strategies for shunt APF were compared and chose ip-iq arithmetic ofthe instantaneous reactive power theory control strategy as the right scheme to produce the instructing current. Based on it, some new control arithmetic was subjoined to suppress the resonance in system and balance the dc side capacitor voltage. Two topologies of main circuit were compared and chose the three-phase voltage-source converter with a split-capacitor as its main circuit structure. The numerical scales of the dc side capacitor and inductance of reactors were calculated. The high-pass filters were designed to eliminate effectively the highfrequency harmonics produced by APF.

通过理论计算和仿真分析，比较了并联型APF的几种控制策略的优点和缺点，从中选择瞬时无功理论控制策略i_p-i_q计算方式为指令电流产生的算法，并在此基础上增加了抑制系统谐振和平衡直流侧电容电压的控制；比较了并联型APF主电路的两种常见形式，从中选择了三相电压型变流器的主电路形式；算出适合该APF的直流侧电容和出线电感的参数；设计出能有效消除APF产生的高次谐波的高通滤波器。

This approach has the advantages of simple circuit, accurate detection and good robustness. Two kinds of topologies in Active Power Filter have been proposed, including APF based on cascade converter with phase-shifted SPWM technique and APF based on current source multimodular converter with phase-shifted SPWM technique.

本文提出了两种基于相移SPWM技术的并联型有源电力滤波器的拓扑结构：基于相移SPWM级联型变流器的电压源型APF，基于电流型相移SPWM组合变流器的电流源型APF。

This paper will present a new diode-clamp cascade multilevel converter derived from these two topologies. The novel concept of the new diode-clamp cascade converter is based on the connection of multiple three-level diode-clamp converter modules.The multilevel waveform is synthesized by adding of each converter output voltage.

本文将结合这两种拓扑结构，研究了一种新型的二极管箝位级联多电平变换器，其思想是将数个二极管箝位变换器模型串联起来，其输出电压是通过合成每个二极管箝位变换器的输出电压而形成的。

This thesis discussed the construction method for hybrid cascade asymmetrical multilevel converters,and some novel topologies are presented. Hybrid cascade asymmetrical multilevel converter can be derived by combining AMC and AMC,or combining AMC and SMC.

本文研究了组合式不对称混合级联型多电平变换器拓扑的生成方法，在此基础上提出了几种新型拓扑，重点研究了不对称同构混合级联型多电平变换器和不对称异构混合级联型多电平变换器。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。