查询词典 basic circle

In this paper,we study the problem finding basic circle in plane graph,in which the number and coordinate of nodes and the node number of two ends of the side is given,we create a method,which is enlightened by the"proble of find way in labyrinth",to find way in branch point and then to find basic circle.

论文讨论了平面图形中存在着节点和边，在已知节点的坐标、标号以及边的标号和边两端的节点标号情况下，对其中存在的一阶环进行计算机搜索问题，提出了受"走迷宫"问题启发的一种在分叉点沿一定的方向进行搜索的方法。

Mathematics: Understands and applies basic and advanced properties of the concepts of geometry; Use the Pythagorean theorem and its converse and properties of special right triangles to solve mathematical and real-world problems; Understands the basic concepts of right triangle trigonometry (e.g., basic trigonometric ratios such as sine, cosine, and tangent); Uses trigonometric ratio methods to solve mathematical and real-world problems (e.g., determination of the angle of depression between two markers on a contour map with different elevations); Uses properties of and relationships among figures to solve mathematical and real-world problems e.g., uses the property that the sum of the angles in a quadrilateral is equal to 360 degrees to square up the frame for a building; uses understanding of arc, chord, tangents, and properties of circles to determine the radius given a circular edge of a circle without the center

数学：理解和应用几何概念的初级和高级特性；用毕德哥拉斯定理、逆定理以及特殊直角三角形性质解决数学的和现实世界的问题；理解基本的直角三角形三角比；运用三角比方法解决数学的或现实的问题。（等高线图上的两个标记之间的俯角确定）运用形体之间的关系及其属性解决数学的或现实的问题（利用四边形内角和等于360度来为建筑物框架取正，运用弧，弦，切线和圆的性质确定缺少中心的一段圆弧的圆心

The basic principle is based on spherical astronomy and elementary geometry of the trajectory mapping method based on the observation of a celestial body zenith distance, then the ship is located in order to sing the next point as the center of this satellite zenith distance of the ship's position as the radius of the circle, observing the same two objects, or objects at different times of the two observations, we can get two ship's position round, then the ship must have been a point of intersection of two ship's position on the circle.

其基本原理是建立在球面天文学和初等几何中的轨迹作图法基础上的，观测一个天体的天顶距，则航船就位于以星下点为圆心，此星天顶距为半径的船位圆上，观测两个天体或者不同时间同一天体的两个观测值，就可以得到两个船位圆，则航船一定在两个船位圆的一个交点上。

Basic circle is the circle which form s involute.

基圆是形成渐开线的一个定圆。

This text mainly passes the current situation, characteristic and existing problem of taking care of books of universities, colleges, junior colleges and special secondary schools of Shanxi of the investigation, combine scientific methods such as the modern management theory, system engineering,etc., has analyzed the institutional framework of taking care of books of all kinds of schools of our province and management system, comply with the information-based macroclimate and requirement of the teachers and students of the big, special secondary school universities and colleges, use marriage partner -oriented programming language Visual Basic 6.0 of the computer, database Microsoft Access 2000 and data base administration language SQL language, have analyzed the books managements of all universities, colleges, junior colleges and special secondary schools of our province, according to the actual conditions, combine books administrative skill, computer programming technology and database technology, have book developed the books information management system of each function module of can offer the inquiry, purchase of the books, borrow the book, return the book, lose the book on the computer ing etc., have offered the effective basis for development of the taking care of books undertaking of the education circle of our province.

本文主要通过调查山西省大、中专院校图书管理的现状、特点以及存在的问题，结合现代管理理论、系统工程等科学方法，分析了我省各类学校图书管理的组织结构及管理体系，顺应信息化大气候和大、中专院校的师生的要求，使用计算机面向对象的编程语言Visual Basic 6.0 、数据库Microsoft Access 2000和数据库管理语言SQL语言，对我省各大、中专院校的图书管理工作进行了分析，根据实际情况，将图书管理技术、计算机编程技术和数据库技术相结合，在微机上开发了能够提供对图书的查询、购买、借书、还书、丢书等各个功能模块的图书信息管理系统，为我省教育界的图书管理

This paper presents a new method to determine the minimum basic circle radius of a plate cam with a roller follower by the allowable pressure angle, and gives the feasible region of geometrical parameters of the cam mechanism.

介绍按许用压力角确定滚子从动件盘形凸轮最小基圆半径的一种新的解析方法。同时给出凸轮机构几何参数的可行域

The first one is to generate the circle for each borderline segment of the component by considering the segment length and the prescribed tolerance value. If this is not the case, the borderline segment will be equally divided into halves until the obtained circle satisfies the tolerance value over the whole borderlines of the component. The basic idea of the last two algorithms aims at covering the domain occupied by the component as much as possible. The circle generation is carried out sequentially from salient angle to the sector formed by the salient angle till the uncovered borderline segments of the component. Particularly, the three-step algorithm with gap allows that the generated circles are distributed with gap along the component contour.

二分法利用组件各边长度和设置的容差大小得到该边的候选包络圆，若该圆不满足组件所有边的容差要求，则将该边不断地对分，直至所得到的包络圆满足各边的容差要求；三步划分法和带间隙的改进三步划分法则以组件区域为划分对象，依次对组件多边形凸顶角、凸扇形区和多边形各边剩余线段划分包络圆，且带间隙的改进三步划分法则允许包络圆在组件边界上以适当的间隙分布。

As for the hydraulic design of volute, its basic circle and tip area may be larger than others.

6结合CFD软件对所设计的两个叶轮进行了流动模拟。

This paper investigates the basic principle of land and real property appreciation along the line produced by urban rail transit, analyzes the action process of urban rail transit development benefit, and demonstrates the basic characteristics of vested benefit of urban rail transit by using overseas related research results for reference. On the basis, the influence circle of urban rail transit development benefit is studied, the primary model is created according to the consistence principle of trip access, and the development benefit influence circle of each station on Line 1 is caculated for trial. At the same time the development benefit influence circle of the Xin-Zhuang Station on Line 1 is analyzed according to the research data, which verifies the model results. In addition, further research problems are put forward.

本文从城市轨道交通引起轨道交通线路沿线区域内的土地和不动产增值的基本原理入手，分析城市轨道交通利益发生、扩散和转移的作用过程，借鉴国外学者的相关研究成果，阐明了城市轨道交通利益最终归属的基本特征；在此基础上，重点对城市轨道交通开发利益的影响范围进行研究，根据出行可达性一致的原则建立了城市轨道交通开发利益影响范围的初步计算模型，针对上海轨道交通1号线各车站的开发利益影响范围进行了试算；同时，根据实际调查数据对上海轨道交通1号线莘庄站的开发利益影响范围进行了对比分析，验证了模型计算结果；此外还提出了有待进一步深化研究的问题。

The article presents the developing condition of PWM and SVPWM first.Then the theory of SVPWM is discussed in detail.The SVPWM is based on the thought of magnetic chain tracking.It makes the ideal magnetic chain circle of three-phased sysmmetry electric motor supplied by three-phased sysmmetry sine wave voltage for basis,uses the practical magnetic chain vector formed by the different switch modes of three-phased inverter to track the basic magnetic chain circle.During the course of tracking,the inverter changes the switch modes properly to form the PWM waves.Then the modulation wave of SVPWM is analyzed in detail.The modulation wave of SVPWM is implicit,but the analogous modulation wave in A-B-C axis needs to be calculated in order to expose the internal relation of SVPWM and SPWM.That is to show the implicit modulation wave of SVPWM. SVPWM actually is a transformed SPWM ruly sampled by the modulation wave which is injected by the zero prefaces based on space vectors.

本文首先对脉宽调制技术的发展现状进行了综述，在此基础上分析了电压空间矢量脉宽调制技术的发展现状；接着对空间电压矢量脉宽调制技术的基本原理进行了详细的分析和推导，SVPWM是基于磁链追踪的思想，它以三相对称正弦波电压供电下三相对称电动机定子理想磁链圆为基准，由三相逆变器不同开关模式下所形成的实际磁链矢量来追踪基准磁链圆的，在追踪的过程中，逆变器的开关模式作适当的切换，从而形成PWM波；然后详细分析了电压空间矢量脉宽调制技术的调制波，虽然SVPWM法的调制波是隐含的，但是为了揭示SVPWM法与SPWM法的内在联系，需要求出SVPWM在A-B-C坐标系上的等效调制波，也就是将SVPWM的隐含调制波显化；SVPWM实质是一种基于空间矢量在三相正弦波中注入了零序分量的调制波进行规则采样的一种变形SPWM。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。