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Hhaever,the overflow section profile of gravity dam is composed of several curves, so approximately operations are often used in pratice by repacing curves with fod lines, which notonly affects the accuracy of project designing but also has diffculty in programming and calculat-ing on the computer.

在进行重力坝设计时，必须进行自重荷载计算，而在常见的教材中，对于自重荷载的计算，往往都是以非溢流坝段为例，非溢流坝段剖面由直线和拆线组成，自重荷载计算比较简单。

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。

Also the constructed curve is a shape-preserving curve for the original curve. We can also adjust the shape of curves by parameters of trigonometric uniform polynomial curve to approach the polygon closer. The general trigonometric polynomial curves with m degree and C(superscript 2m-1)(m=1, 2, 3) continuity are further presented.

除了通过切点参数，还可以通过三角均匀多项式曲线参数来调整曲线形状，使所得曲线更加逼近多边形，并可进一步、类似地可构造与给定多边形相切的C(上标 2m-1)(m=1， 2， 3)连续的m次三角多项式曲线。

Here, we will give an independent proof of the existence for inequality (2.1.3), and by the way, give an estimate on the width of the bi-enclosing annulus of closed convex curves in the plane. Secondly, in this part, we will introduce the notation of average geodesic curvature for curves in the hyperbolic plane, and investigate the relationship between the embeddedness of the curve and its average geodesic curvature.

其次，对双曲平面上的曲线引入平均测地曲率的概念，并讨论双曲平面上凸曲线的嵌入性与它的平均测地曲率之间的关系，其目的是为了将双曲平(来源：ABC论84文网www.abclunwen.com)面上曲线的性质与欧氏平面中曲线的性质作一些对比；最后，我们利用Minkowski支撑函数构造了一类新的非圆的光滑常宽曲线，其目的是想回答有关常宽曲线的一些未解决问题如是否存在非圆的多项式常宽曲线？

After applying the brush in to your hair heart, select all your hair curves then select your hair stroke and choose "Set Stroke Control Curves".

在应用刷到你的头发的心脏，选择所有你的头发曲线，然后选择你的头发中风，并选择"设置行程控制曲线"。

The divergence angle is calculated based on geometry characteristics of two facula curves detected at the different positions to the laser. Facula curves are gained through scanning by two hemicycle probes which have different radius.

该方法以激光光束传输到不同距离处的2条光斑外缘曲线的几何特征为基础来求LD的发散角，而2条光斑外缘曲线分别由2个半径不同的半圆环探头的旋转扫描探测获得。

The study shows that the pressure transient curve of fractured wells in closed circular formation can be divided into six different flow regimes. In condition of the same fracture opening width and fracture length, compared to rectangular fracture, the pressure drop with tapered fracture is bigger, and the dimensionless pressure and pressure derivative curves are higher. In condition of the same fracture opening permeability, compared to linear declining and constant conductivity fractures, the pressure drop with exponential declining conductivity fracture is the biggest, and the dimensionless pressure and pressure derivative curves are the highest.

研究结果表明：圆形封闭地层压裂井的压力动态曲线可以划分为6个流动阶段；在相同裂缝开口宽度和相同裂缝长度的条件下，与矩形裂缝相比，楔形裂缝压力消耗大，表现为无因次压力及压力导数曲线越高；在相同裂缝开口渗透率的条件下，与导流能力呈线性降低的裂缝以及常导流能力裂缝相比，导流能力呈幂指数降低的裂缝压力消耗最大，表现为无因次压力及压力导数曲线最高。

The problem of interpolation by a special kind of polynomial curves-Pythagorean hodograph curves in computer graphics is studied in this paper.

对计算机图形中一类特殊的多项式曲线？？ Pythagorean hodograph曲线的 C1 Herm ite插值问题进行研究。

This bicubic Pythagorean hodograph curves can deal with the inflexion flexibly and two cubic Pythagorean hodograph curves reaches C 1 continuous at the connection point.

引 言PH曲线是一类特殊的平面多项式曲线，1 990年由 Farouki和 Sakkalis[1]在研究等距曲线的过程中提出。

In this article, we make some research due to some problems of HECC, including the math background of hyperelliptic curves cryptography, the algorithm of divisor scalar multiplication, and providing a kind of general digital signature based on hyperelliptic curves cryptography.

为了确保这一系统的稳定性与安全性，HECC的几个主要参数的选取问题就起了很大的作用，本文对这几个参数选取作了详细介绍，并且归纳了求基点和求阶的方法。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐