基本元件

Power system transient stability calculation has long been recognized as a basic and important method of power system analysis and...

电力系统暂态稳定计算是电力系统分析和控制中最基本也是最重要的方法之一，其中电力系统元件的模型选取和建立有着很重要的作用。

These constructs were transiently transfected into F?9 cells and the luciferase activity of each construct was determined.

Nodal 基因的基本启动子元件位于转录起始位点上游约60 bp，其中含有一个位于－ 33 bp 处的TATAbox，它对于转录起始起着重要作用。

A reverse read scheme for two-bit operation is illustrated.

第一章简介此元件基本的结构以及写入抹除的方式。

The principle, measuring method, structure and parameters of the device are given and the centroidal calculating formula of elliptical spot is derived.

给出了测试的基本原理、测试方法、测试装置的结构以及元件参数设计，并推导了椭圆光斑时光斑质心定位算法。

Firstly, the paper gives a detailed analysis of the design of computer optical element. We researches scalar diffractive theory mainly.

首先对计算机光学元件的基本设计理论进行了详细分析，着重研究了标量衍射理论。

This article introduces types and characteristics of vehicle's transmission,and analysed its current development,with detailed discussion on the research methods of epicyclical gear transmission at home and abroad,including the design methods of its transmission diagram which has two or three degree-of-freedom,the process of shifting gears which has multiple degree-of-freedom,the denotation method of joint element on the chart of equivalent lever,and the equivalent lever method in which the dynamic and kine...

介绍了车辆变速器的种类、特点与发展概况，对变速器中的机械传动部分，特别是行星齿轮传动的研究状况介绍的较为详细。对国内外关于2自由度、3自由度行星式变速器传动简图的设计方法，多自由度变速器的换档过程，利用等效杠杆法研究行星齿轮传动，等效杠杆图中接合元件的表示方法，利用等效杠杆的运动分析、力分析和运动分析方程，建立行星变速器相应分析的方程的基本情况作了介绍，并分析了各种研究方法的适应范围与优缺点。

Electromechanical components for electronic equipment - Basic testing procedures and measuring methods - Part 20-2 : test 20b - Flammability tests - Fireproofness.

NF C93-400-20-2-2001 电子设备的电机元件。基本试验过程和测量方法。第20-2部分：试验：20b。燃烧性试验。

According to the definition and the distribution of VSR's voltage space vector, the introduction of a rule-based SVPWM current control strategy, with non-fixed switching frequency and dual hysteresis loops, that obviously improves the performance of current control. Based on two kinds of control strategies of VSR under unbalanced grid condition, the introduction of a new VSR control strategy featuring undamped-oscillation that simplifies the controller structure and effectively improves VSR's performance under unbalanced grid condition. A systematic description of the state switching in trilogic PWM signal generation of threephase CSR by using the conversion between bilogic and trilogic switching functions.

作者在如下工作的基础上对PWM整流器的一些关键问题提出了自己的研究思路、观点和方法：根据PWM整流器网侧矢量关系，直观地描述了其四象限运行的基本原理及特征；定量分析了VSR、CSR的PWM换相过程及波形特征；引入等效变压器模型并详细分析了VSR、CSR基于d—q模型的动、静态特性；提出了满足四象限有功、无功运行指标时的VSR交流侧电感设计方法；并提出了依据控制系统跟随性和抗扰性性能指标设计VSR、CSR直流侧储能元件的参数计算方法；在研究了VSR电流控制策略基础上，提出了影响VSR电流控制的几个要素，并进行了定量分析；根据VSR空间电压矢量的定义及分布，提出了基于规则控制的不定频滞环空间矢量PWM电流控制策略，并由此提出了具有双滞环特性的不定频滞环优化SVPWM电流控制策略，有效地改进了滞环PWM电流控制性能。

The paper presents analysis and design methods of sequential logical circuit to make reader under-stand principles of the basic trigger,master—slave trigger and the edge tripple based on knowing the combina-tional logical circuit design.

摘 要：介绍了时序逻辑电路的分析和设计方法，使读者在了解了组合逻辑电路设计的基础上，了解基本触发器、主从触发器和边沿触发器原理，能够分析、设计以触发器为核心元件，且与电路初态有关的时序逻辑电路。

From the viewpoint of energy conserving, the properties of bond graph multiport element MTF are discussed.

从能量守恒的基本原理出发，讨论了键合图中的多通口元件MTF所具有的性质。

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。