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The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.

本文研制了用于真空度检测的高频脉冲电源,通过Simulink仿真和试验检验其满足设计要求,实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出;利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集,通过异步串行通信实现单片机与计算机之间的数据通信,将检测数据传至上位机;在上位机利用Matlab开发人机交互界面,实现相关数据处理和图形显示,包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。

As basic element of CAGD, representation, design, display, analysis and handle of curve and surface is main task of CAGD.

作为CAGD系统基本几何元素,自由曲线、曲面的表示、设计、显示、分析以及规格、处理(包括数据结构、数据库、图形的信息形式和调整方式等)问题,是计算机辅助几何设计的主要研究对象和内容。

Constructing triangle surface which interpolates the boundary curve and cross-boundary slopes on a triangle is the basic problem in computer aided geometric design, computer graphics and so on.

在三角形域上构造对边界曲线和跨界导数插值的三角曲面是计算机辅助几何设计和计算机图形学等领域中的基本问题。

Programming of the fractal dimension based on Windows platform can be done using Visual Basic and Validated by means of lines, rectangles, Cantor Dust and Koch Curve.

利用Visual Basic完成了基于Windows平台的分形维数计算程序的设计,并以直线、矩形、康托尘、科赫曲线等分形图形对其进行了检验。

All of the above polynomial equations have full circularity.

以上之多项式方程式的图形均是全圆点曲线。

This essay studies the graph characteristics method of parameter curve and its describing mdthed and the evaluation of the plane region area closed by itself.

研究参数方程所示曲线的图象特点及描绘方法、自身封闭所围平面图形的面积的求法,弥补了现行教材的不

We propose a closed surface parametrization method based on a new theory of curves and surfaces.

曲线曲面是计算机图形学和计算机辅助几何设计中的基本研究对象。

By using the mathematical method of curve integrals,it derives the mathematical formula to calculate the cross-section ductile coefficient of RC ring section member.

从钢筋混凝土正截面承载力计算时的基本假定出发,建立了环形截面上各种应力图形的函数表达式,利用曲线积分的数学方法,推导出计算钢筋混凝土环形截面构件截面延性系数的数学公式。

This program segment to be able to draw a complete graph of the cobweb diagram, other sites basically did not provide for the study of economic control issue is a useful feature programs.

详细说明:此程序段能完整画出所要图形曲线的蛛网图,其它网站上基本没有提供,对学习经济控制问题是个很有帮助的的功能程序。

First, we introduce the principle of feeder protective apparatus and select adequate protective equipments in accordance with different types of distribution system, using the least square error method to simulate the time/current curve and applicate simulation formula to digital the curve data, Secondary, using augmented incidence matrix method to find the exact pairs of primary/backup protection relay and find the relay tripping sequence of distribution lines.

首先介绍线路之过电流保护设备动作原理,依不同之配电系统型态来选用适当之保护设备种类,并使用最小平方误差法模拟保护电驿之时间-电流特性曲线,应用模拟方程式将曲线之资料数位化,且藉由图形理论中之增广关联矩阵法求取正确之主保护与后卫保护电驿对,以找出系统中各配电线路保护电驿间之跳脱顺序关系。

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I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像,后来回台湾,甚至去年在北京,居然也四处看见她的海报,才惊讶她的魅力之大。

Ah may dee:You are chinese living in a democratic country.

你是居住在民主国家的中国人吧。