平面曲线

The surface generated by a straight line, the generator, passing through a fixed point, the vertex, and moving along a fixed curve, the directrix.

锥面由一条直线，即母线，通过一固定点，即顶点，沿一给定曲线，即准线，连续移动而产生的平面

In this report, based on initial data array of annual increase of growing stock, GM(1, 1) enveloping grey surface is set up, and predictive curve is obtained by fitting initial data with differential equation according to mecha- nism of GM model. Scientific basis has been provided for determining the optimum annual cutting norm.

为合理采伐利用林木资源，本文根据全区林木年蓄积增长量原始数据列，建立GM（1，1）包络灰平面，并按GM模型建模机理，用微分程拟合原始数据，求得预测曲线，使预测值落在栽一范围内，为确定最佳年采伐限额提供了科学依据。

Properties of Curves, Surface in Three Dimensions, The First Fundamental Form

课程内容：平面与空间中曲线，曲率和挠率，全曲率，同周边不等式，曲面的基本式，平

This paper describes the conjunction relationship of the basic point of the flat surface outline on the parts and reveals the internal law of the intersections connecting with the typical curve;The principle of the calculation and the characteristics on straight line to parabola basic points are illustrated.

介绍了平面轮廓零件各组成元素之间的连接关系，并揭示了典型曲线交接的内在规律，阐述了直线与抛物线交接点的计算原理和特点，总结归纳直线与抛物线连接的处理方法，以及自动淘汰无效基点的基本准则。

This paper describes the conjunction relationship of the basic point of the flat surface outline on the parts and reveals the internal law of the intersections connecting with the typical curve;The principle of the calculation and the characteristics on straight line to parabola basic point s are illustrated.

介绍了平面轮廓零件各组成元素之间的连接关系，并揭示了典型曲线交接的内在规律，阐述了直线与抛物线交接点的计算原理和特点，总结归纳直线与抛物线连接的处理方法，以及自动淘汰无效基点的基本准则。

This paper gives a mathematical definition to that two open planar curves have the same shape based on curvature representation, therefore, a new kind of shape distance is proposed. It is concluded that the problem of computing the shape distance between two open planar curves can be changed to the problem of a functional extremum, and the differential equation is given, which can be used to figure out the shape distance.

本文为基于曲率表示的两条平面开曲线的等形下了严格的数学定义，从而找到了一种新的形状距离度量，并且证明了这种形状距离的计算问题可以转化为一个泛函的极值问题，同时给出了求解形状距离的微分方程。

A U like shape on the curve of fundamental mode waist in the active medium versus pump power, at different cavity lengths of the laser diode end pumped Nd:YVO 4 solid state lasers with a flat flat resonator structure, is analyzed by means of the transform circle approach.

运用谐振腔变换圆理论，详细分析了激光二极管抽运的Nd ：YVO4 平行平面腔固体激光器振荡光在晶体内的基模光斑半径随抽运功率变化的U形曲线。

The features to evaluate the tooth contact quality such as the location of the contact point on the tooth surface, clearance between the meshing tooth surfaces, curve of the transmission error and the path of the contact point are investigated. The accurate geometric representation with non-uniform rational B spline of the worm and the wheel tooth surface is presented then the corresponding program is developed.

根据平面包络环面蜗杆传动的创成方法，建立了包含加工误差的蜗杆和蜗轮的齿面方程，分析了平面包络环面蜗杆传动和平面二次包络环面蜗杆传动的刚性啮合特性如误差对接触点的位置、齿面间隙、传动误差曲线和接触点在齿面上的轨迹的影响。

I was a university student, I had not done a very complex programming exercise, This is the first time I upload source. this is the upload computer graphics, I do exercises at the WIN-TC environment prepared by some of the procedures, these are the basic 2D graphics transform (translation, rotation, Shear, Zooming, symmetric) animation demonstration, three-dimensional map of the two-dimensional plane of the hidden map, the lines cut, the parabolic mapping and B-spline curves mapping, detailed procedures of the Notes, and I hope to the students friends to help.

详细说明：我是一名大学的学生，我没有做过很复杂的编程练习，这也是我第一次上传源程序，这次上传的是我做计算机图形学的练习时在WIN-TC环境下所编的一些程序，其中有二维图形的基本变换（平移，旋转，错切，放缩，对称）的动画演示、三维图在二维平面上的消隐图的显示、线条的裁减、抛物线的绘制以及B样条曲线的绘制，程序中有详细的注释，希望对学生朋友们能够有所帮助。

In this paper,it is proved that a Minkowski plane with π/2-property,whose unit circle is Radon curve,is an inner product space .

证明了单位圆是Radon曲线，且具有π/2性质的M inkowski平面，是内积空间

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了