逆的

Single loop instantaneous voltage feedback control and multiple loop feedback control, which can be realized by digital method or analogue method, are normal control strategies of inverter. The controller's performance of a same control strategy designed by different designers is different This paper makes out uniform analysis and design theory of inverter control strategies with pole-assignment technique of state-space theory for the first time. It is firstly proposed that controller parameters being equal to control system orders is the base of realizing high performance inverter. Design and performance comparability of various controllers is presented with uniform pole-assignment method.

本文首次采用状态空间理论的极点配置技术，对逆变电源的几种控制策略进行了统一的分析和设计，首次提出控制器控制参数与控制系统阶数相等是高性能逆变器控制实现的基础，并通过极点配置这种统一的设计方法对各种控制器进行了设计和性能比较，分析了要考虑的一些非理想因素的影响。

There are some information about the development of soft switch and welding machine. There are also introduce some methods about the athwart invert current and how to realize it. At last we introduced the structure of DSP and how to design the module by software.

在本论文中首先介绍了软开关技术和电焊机的一些发展，然后介绍了几种典型的逆变电路和实现逆变的方法，最后讲述了DSP的硬件结构和模块以及控制软件的设计方法了软件中的模块。

The discovery of a series of sub-thrust fault which is on the top of main thrust fault solve the problem of structure relationship of many wells of pre-Cambrian. And then our interpretation work is aimed to distribution, formation time and formation mechanism of buried hill fault. In according to the characteristics of main fault, enrichment characteristics of oil and gas and so on, we re-divide the blocks of buried hill. New blocks are better for the distribution of oil and gas.

主逆断层上盘的系列次级逆断层的发现，较好地解决了前寒武系多口井的构造关系；在此基础上解释工作针对潜山断裂的分布特征、形成期次、形成机制进行研究，根据主要断层特征、油气富集特点等对潜山进行重新分区，新分区更有利于研究潜山油气的分布特征。

The Sichuan earthquake of May 12, 2008, occurred as the result of motion on a northeast striking reverse fault or thrust fault on the northwestern margin of the Sichuan Basin.

四川地震， 2008年5月12日，发生的结果的议案，东北突出的逆断层或逆冲断层对西北缘的四川盆地。

The Sichuan earthquake of May 12, 2008, occurred as the result of motion on a northeast striking reverse fault or thrust fault on the northwestern margin of the Sichuan Basin.

2008年5月12日的四川地震，是由四川盆地西北边界呈东北走向的逆向断层或逆冲断层(断层面的倾斜角度为45度或少于45度的逆断层)运动所造成的。

A simulation research is conducted on the example of six-phase double star winding shifted by 30°synchronous motor.In order to investigate the control algorithm of multilevel inverter , high harmonics as well as its problems, a mathematical model of the control algorithm based on the voltage space vector is built. For the first time, the principle along boundary is introduced to confirm the chosen switch state when many switch states are corresponding to the same vector. Simulation analysis and hardware realization are conducted with the combination of diode clamped three-level inverter and five-level inverter.

建立了基于空间电压矢量控制算法的仿真模型；仿真研究中采用对偶小矢量搭配改善中点电位波动的问题；针对多个开关状态对应同一待选矢量的问题引入&循边原则&确定被选择的开关状态；对过调制问题进行了相应的处理：结合二极管嵌位式三电平逆变器和五电平逆变器进行了仿真分析和硬件实现。

In this paper,we develop the equations to determine the differential stresses for normal and reverse faults, which increase with depth and are related to the initial shear strength and the angle of inner fraction of rocks on the surface.

正、逆断层发生时的差应力大小随埋深的增大而增大；在地表条件下，正、逆断层发生时的差应力与岩石初始抗剪强度和岩石的内摩擦角有关。

At the beginning the representatives of elementary rectangular band of E-unitary in-verse semigroups is studied, with the congruences on lattices and on completely simplesemigroups the congruences and congruence lattices on elementary rectangular band ofE-unitary inverse semigroups are described.

首先研究了E-酉逆半群基本矩形带的结构表示形式，用半格上的同余和完全单半群上的同余刻画了E-酉逆半群基本矩形带的上的同余和同余格。

The new electromagnetic properties of negative index material such as converse Cerenkov radiation and converse Doppler effect,negative refraction index and perfect lens are analyzed and explained by using basic electromagnetic theory.

从基本的电磁场理论出发，分析和解释负折射物质的电磁特性，以及负折射物质中的逆Cerenlov现象、逆Doppler现象、负折射率和完美透镜的工作原理，帮助人们更加清楚地认识负折射物质的本质特性，更好地开发和应用好负折射物质。

These experimental results indicate that the improved plug-in repeative control scheme combining with the circumfluence R.M.S. compensation method are feasible for inverts parallel operation,which will meet the demand of power single-phase invert-paralleling systems.

实验结果表明，对于单相逆变器并联系统，本文提出的改进型嵌入式重复控制策略以及基于环流有效值的均流补偿策略是可行的，可以满足大功率单相逆变器并联的要求。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。