三次曲线

The first harmonic winding and harmonic winding no-load property curve are gained when field current is change.

通过改变励磁电流的大小，得到了基波绕组和三次谐波绕组的空载特性曲线。

GPLconx - GPLconx is an educational visualization tool that allows exploration of lines and conic sections in three models of 2-D hyperbolic geometry.

GPLconx是一个教学可视化工具，可以观看2D双曲线几何体的三种模型的线条和二次曲线部分。

In this paper an efficient method that can interpolate cubic NURBS curves is proposed for generating the subdivision surfaces.

鉴于此，提出了一种高效的可以插值三次NURBS曲线的细分曲面生成方法。

By analyzing the differences of three rank parameter curve from zero rank to three ranks, the interpolation successive formula is deduced.

通过对三次参数曲线 0 3阶差分的分析，导出了其插补递推公式，其中只包含加法运算，可以得到很高的插补速度。

On the basis of early research, the characteristic curves for unsteady spherical flow of non-Newtonian fluid are studied.

在前人研究的基础上，对非牛顿流体不稳定球形流特征曲线进行研究，研究成果可用于模拟解释聚合物驱三次采油。

The interpolate algorithms of three-order NURBS curve and double three-orders NURBS surface are presented. The expressions of partial derivative and normal curvature of NURBS surface are derived by the theory of differential geometry. The geometric characteristics of different curvature area of the free-form surfaces are analyzed in detail. All these work lays a theoretical foundation for constructing the cutter location calculating model of free-form surfaces NC machining. 2 On the basis of analyzing the methods of cutter path generation, the standard of evaluating the various methods of cutter path generation is presented. The method of generating cutter path with constant scallop height is presented for the first time.

本文以提高复杂曲面多坐标数控加工精度和加工效率为目的，在对国内外研究现状进行深入分析的基础上，对数控编程中各环节的关键技术问题进行了深入研究，主要内容包括以下几方面： 1 分析了复杂曲面各种造型方法的优缺点，给出了根据各种边界条件所确定自由曲面的NURBS表示方法以及三次NURBS曲线曲面反算算法；用微分几何理论推导了NURBS曲面的偏导矢及法曲率计算表达式；对曲面不同曲率特性区域的几何特征进行了深入分析，为建立复杂曲面的数控加工刀位计算模型奠定了理论基础。

Because only two points a straight decisions, and in between the two curves can be used an infinite number of cubic polynomial approximation.

因为，两点只能决定一条直线，而在两点间的曲线可用无限多的三次多项式近似。

The new method gives out a set of equations based on the fundamental algebra rules that principal stress trace obeys and the essential attributes it possess, we then combine these equations with further information described in this paper leading to an exact description of the conic representing the principal stress traces.

该方法是根据主应力迹线满足过任意三条等倾线的主应力都可以用二次曲线来描述这一条件，再利用主应力迹线本身所具有的性质列出方程组解算出描述主应力迹线的一元二次方程，然后根据方程描绘出所求的主应力迹线。

They include the glide track following system、the quartic curve leveling control system and the lateral deflection correcting system.

三、无人机自动着陆部分：分别设计了下滑轨迹跟踪控制系统、四次曲线拉平控制系统及侧向偏离修正控制系统。

Computer application ; curve design ; rational interpolation ; cubic spline

计算机应用；曲线设计；有理插值；三次样条

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。