介绍

The paper reviews the phylogeny of the LCD, describes the recent development situation of LCD-TV and several authority investigation institution do its prospective forcast. The research of the switching power supply, future development t rend is given in the paper. Outlines of LCD-TV technology, introduce the sort of topological structure. The BUCK type converter topological structure and the systematical basictheory were put emphasis on; the PFC, the reasons of power factor simply and the core of L6562 were analyzed, emphatically on the application circuit of this core, and account the design parameter of the application circuit. The sort and control mode of PWM, the control core of UC3846 and OB2262 were explained, the application circuit of this core were specific analyzed, practice picture in the real circuit uses oscilloscope were educed and contrastive analysis in this research.

本文回顾了LCD的发展史，介绍了LCD-TV发展的近况和一些权威调查机构对其未来的预测；对开关电源的研究概况和它的发展趋势作了总结；总体介绍了LCD-TV电源的结构及工作原理、拓扑结构的分类，着重研究了BUCK型变换器的拓扑结构及工作原理；对PFC作了综述，研究了功率因数降低的原因，重点介绍了L6562芯片，对此芯片的应用电路作了具体分析，并对芯片外围的设计参数作了分析研究；研究了PWM的分类和控制模式，对控制芯片UC3846和OB2262分别进行了重点说明，详细研究了基于UC3846的PWM设计，用示波器对其实际电路进行了抓图，并对比分析实际波形。

In the chapter 4, some mathematic modules are constructed , which are rules of the system programs, we use second-grade parameters to identify input signals. Based on mathematic modules and second-grade parameters, system programs using "Top-Down" designing idea are divided into some module programs in the chapter 5, At the end of this chapter, questions and resolutions in testing are introduced; In the last chapter .application of download characteristics of MCU is used on long distance update , so the totalizer can be used in broad fields if software designed reasonably .

第四章中先介绍了程序中使用的一些数学模型和利用设置二级参数确定输入信号类型的方法；第五章中介绍了采用自顶向下的模块划分程序设计方法编制的系统软件的过程，并在章末介绍了系统调试方面出现的问题和相应的解决方案；第六章利用MCU的下载特性和网络功能，推出实现智能仪表软件的远程升级方案，通过软件设计，使得仪表有了更为广泛的应用空间，实现单表多用。

The choice of the transformer includes: Main transformer use the main technique in number, capacity, model number...etc. in set data of the transformer to really settle; The electricity lord connected the line to introduce primarily the electricity lord connects the linear importance, design according to, the basic request, every kind of merit and shortcoming and lords that connect the line form connects the linear choosing more, the lord that combine to establish the in keeping with my plant the request connects the line; The short-circuit galvanometer is regarded as the most important link, this thesis introduced the calculating purpose in short-circuit electric current, assumption term, general provision, the calculation, network transformation of a parameter detailed, and each calculation etc. knowledge that short circuit order; The choice of the high pressure electricity equipments includes the mother line, high pressure breaks the road machine and insulate the switch, electric current to feels with each other the machine, electric voltage feels with each other the choice principle of the machine, high pressure switch cabinet with request, and proceed to these equipments the school check with the related introduction in product.

变压器的选择包括：主变压器的台数、容量、型号等主要技术数据的确定；电气主接线主要介绍了电气主接线的重要性、设计依据、基本要求、各种接线形式的优缺点以及主接线的比较选择，并制定了适合要求的主接线；短路电流计算是最重要的环节，本论文详细的介绍了短路电流计算的目的、假定条件、一般规定、元件参数的计算、网络变换、以及各短路点的计算等知识；高压电气设备的选择包括母线、高压断路器、隔离开关、电流互感器、电压互感器的选择原则和要求，并对这些设备进行校验和产品相关介绍。

Beginning with wave equation, the paper has deduced the propagation of gauss pulses in single mode fiber and fiber grating transmission compensation. The characteristics of cascaded phase-shift gratings are discussed by numerical simulations of coupled-mode theory and T-matrix method. The experimental works and measurement results are shown in this paper. On the other hand, we have introduced the basic theory of EDFA and figured out the characteristics for EDFA at different conditions by numerical simulation. Some experimental results for EDFA are also presented here. In this article, you can find the influence on Optical Fiber Amplifier by Gain Tilt, especially, the negative effect on CSO in CATV transmission system.

论文首先从波动方程入手，对高斯脉冲在单模光纤中的传播演化及光纤光栅透射补偿进行了详细的研究；较系统地介绍了光纤光栅的耦合模理论，并将传输矩阵计算法用于计算级连相移光纤光栅的光学特性；重点介绍了作者在光纤光栅刻制及特性测量方面所做的一些实验研究工作；较系统介绍了EDFA的基本理论，计算出各种条件下EDFA的光学特性，并进行了一些实验研究；综合分析光纤放大器对光纤传输系统的影响，特别分析了光纤放大器增益不平坦对光纤CATV系统中CSO恶化的原因及其解决方法，并研究了光纤布拉格光栅在稳定980nm泵浦源输出功率和输出波长方面的应用；结合一个基于光纤光栅和光纤放大器的光纤用户接入网方案，对光纤用户接入网的若干问题进行了理论与初步的实验研究。

It can also be used as a powerful tool in data base systems. A kind of Mini-LISP language used on VAX/VMS 11-780 and PDP11/45 under the support of RSX-11M operating system is presented with an introduction of the LISP language structure, composition and its programming ...

全文分三部分连载：第一部分介绍Mini-LISP的基本成份、简单原语和基本函数，是LISP程序设计的基础；第二部分介绍λ函数、递归函数及过程函数的表示法，并列举Mini-LISP的常用函数；第三部分介绍LISP语言在符号处理、人工智能和数据库系统设计中的应用实例。

Vice-principal B introduced the digital media technology and technical innovation in our university.

区副区长于大力在会上介绍了我国关于数字媒体技术研发情况以及我市与南岸区的相关情况，B副校长在会上介绍了我校关于数字媒体技术及科技创新工作的情况介绍，丘成桐教授一行就几何信息科研公司研发的三维动态实时核心技术、科研成果、媒体曝光、实例应用、三维智能设想及系列产品开发进行了说明与演示，并回答了与会领导和专家提出的疑惑。

VGP Personnel;Current Research Programs;Hawaii Center for Volcanology

火山学、地球化学与岩石学研究人员介绍；最新研究计划介绍；夏威夷河山研究中心介绍

He was so genuine and unsophisticated that no introduction would serve to introduce him, more than if you introduced a woodchuck to your neighbor.

他是这样单纯，毫不虚伪，无须用介绍的方式来介绍他，正如你无须给你的邻居介绍土拨鼠一样。

The contents are mainly divided into three parts: The first part describes mechanism and metabolism rule of natural products and its classification ; The second part is about the growth and development of plants and their mutual relationship, natural biological active substances which are produced in the course of defending plant diseases and insect damages. The third part is not only the function and principle of medicine, anticancer and antioxygen activity of different kinds of natural products such as resin ,essential oil, high molecule, grease and so on but also their application. The fourth is security problem of Plant Natural Products. Through the lessons, we can correctly understand and use the relationship between plants and environment.

其课程分为13章，内容主要分为4大部分，一是阐述植物天然产物的发生机理和代谢规律，介绍相关主要植物种类，并对天然产物进行化学分类；二是讲述植物天然产物和自身生长发育之间的关系、天然产物如何影响植物之间的相互关系、以及植物如何利用天然生物活性物质抵御病虫害的威胁；三是详细描述了各种天然产物，如植物自身生长发育过程中所产生的活性物质、植物与其它生物之间的相互关系中所产生的生物活性物质、植物毒性物质、植物药理活性物质、植物抗生物质、植物树脂、植物精油、植物高分子、植物油脂、植物抗氧化活性成分等，并阐述它们的药理活性、抗癌性、抗氧化性等对人类健康起作用的的功能和原理；四是提出了植物天然产物的安全性问题，并介绍相关案例和介绍相关法规；在此基础上还专门讲述了树脂、精油、高分子、以及油脂类等天然产物的应用。

In this paper, an electrical coordination device, first developed in China, is introduced.Two types of bivariant function generators are explained in detail

本文介绍了电气协联的构成、基本工作原理和特点；介绍了构成电气协联各环节的工作原理和参数选择方法；比较详细地介绍了两种双变量函数发生器的构成原理和实用电路；列举了有关的试验数据和曲线。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。