查询词典 cubic curve

This paper first summarizes recent researches on this topic, and then proposes some methods for curve modeling with cubic algebraic curve based on pure geometric constraints that involve control points, tangent directions and curvatures.

然后提出了一种基于几何约束的三次代数曲线的插值方法，该方法完全通过几何量如控制顶点、切线和曲率来控制三次代数曲线的形状，使得对三次代数曲线的编辑与对三次 B-样条曲线的编辑一样灵活方便。

The cubic interpolation polynomial is got firstly in the given sub-range of the hydrophone's sensitivity-frequency curve by using the Akima curve smoothed algorithm, and the maximum of the polynomial is calculated in the sub-range by using the one dimension extreme value continued fraction algorithm, finally the frequency of the hydrophone is got.

频率测试是在灵敏度详细测试的基础上，采用阿克玛曲线光滑算法求出检波器幅频特性曲线在给定子区间上的三次插值多项式，再利用一维极值连分式法求出该区间上多项式的极值，从而求出检波器的频率值。

According to the matrix presentation of NURBS curve, ordinary interpolating algorithm on cubic NURBS curve is shown.

根据NURBS曲线的矩阵表示，对常用的三次NURBS曲线进行插值计算，可以了解边界条件和型值点的参数化对插值曲线的影响。

How to interpolate a sequence of given points with a C2 monotonicity preserving cubic spline curve is a basic problem in curve surface modeling techniques.

如何使得曲线在插值给定单调点列的同时，也保证自身的单调性是曲线曲面造型中的一个基本问题。

Then, a modifiable cubic polynomial curve is presented based on the basis functions, and the relation between the curve and the classical Bézier curves is discussed.

然后，基于该调配函数生成了一类可调控的三次多项式曲线，并讨论了该曲线与二次Bézier曲线及三次Bézier曲线之间的关系。

The stress-strain curve of new-old concrete and HPRRC, are suggested to be modeled by two sections: the ascending section of the stress-strain curve is simulated by cubic parabola equation and the descending section is simulated by rational fraction, where the theoretical value is in good agreement with the test value.

新—老砼及HPRRC应力—应变全曲线建议采用两段式拟合：上升段采用三次抛物线方程模拟，下降段采用有理分式模拟，理论值与试验结果吻合较好。

In view of the problems in the traditional highway vertical curve design,the cubic interpolation spline function replacing the conventional curve is proposed and the formula of function is demonstrated.

针对传统的公路竖曲线设计中存在的一些问题，可提出使用三次插值样条函数来替代传统线形的思路。

The first chapter the content examines including the orbital intensity calculated that reserves the axle seam the computation, in the curve reduces axle's arrangement, the axle festival general arrangement plan, the railroad ballast amount used computation, designs the road section and the station yard cubic meter of earth and stone quantity calculates as well as mixes, railroad cubic meter of earth and stone and orbital project construction organization and budget.

第一章内容包括轨道强度检算，预留轨缝的计算，曲线上缩短轨的布置，轨节布置图的绘制，铁路道碴用量的计算，设计路段和站场的土石方量计算以及调配，铁路土石方和轨道工程的施工组织及预算。

Three-dimensional reconstruction is realized by three-dimensional morphological characteristic of cucumber leaf ,cubic Bezier curve of leafstalk,pentagon leafstalk section,jointing quadrangle leafstalk surface,leafstalk shags built by random and joint sequential C0 cubic NURBS surface in cucumber.

根据黄瓜叶的三维形态特征，利用3次Bezier曲线描述黄瓜叶柄曲线，采用五边形作为叶柄截面，用四边形面片进行叶柄表面拼接，并用随机方法生成叶柄的粗毛；利用C0连续的3次NURBS曲面拼接生成了黄瓜叶片曲面，实现了黄瓜叶的三维重建。

Firstly, a quintic PH-spline curve is used to approximate a cubic Bézier curve within a bound. The convergence for the approximation is proved.

研究用C1连续的五次Pythagorean-Hodograph样条曲线逼近一给定的三次Bézier曲线，证明了这种逼近算法在常用误差测度下的收敛性。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。