曲面

This dissertation addresses a practical data processing method of free-form surface for the coordinate measuring machine, including fitting algorithm, probe radius compensation and surface matching .

以坐标变换理论和最优化算法为基础，提出了应用单纯形法，对原始测量点进行坐标平移和旋转变换，将理论坐标与实际坐标统一起来，在此基础上进行误差处理，从而较好的解决了曲面匹配问题。

With the constraints of these feature points, perspective projection, coplanarity and colinearity, the curved surfaces can be recovered by minimizing the linearly constrained quadric objective function.

把特征点的位置、共面、共线、透视投影等作为约束，通过最小化线性约束下的二次目标函数实现曲面重建。

A framework for working corporately with related CAD system,finite ele...

利用文中方法可以有效地缩短复杂汽车外形曲面的造型、计算和分析时间，为汽车外形设计的逆向工程应用提供方法和工具。

The height of the correctitude triangle will be discussed according to the experiment on the testing standard-sphere.

为使测量机完成空间旋转曲面及3D轮廓面的测量，提出等分度测量法及等距测量法。

For improving the quality of Chinese tradition frozen flour food,providing processing informa- tion for frozen flour food industry,standard wheat flour in market was selected as the material,second re- gress correctitude was performed with forceand tractilityas target,two second order quadratic equations for frozen dough sheet processing were built.

以市售标准粉为材料，利用二次回归正交旋转试验设计，分别以冷冻面片质构特性参数破碎力和延展性为响应值建立了冷冻面片制作的二次多项数学模型，验证了模型的有效性，采用响应曲面法(response surface methodology，RSM)考察了交互作用的影响，并根据方程求解出稳定点的水平值，从而确定出冷冻面片制作工艺的优化参数为：和面速度240 r/min，和面时间5 min，和面加水量40%，静置时间30 min，冷冻温度-30℃，冷冻时间5h。

Methods 34 cases of secondary cavernous transformation of portal vein confirmed by clinical corroborative data were reviewed;plain scan and contrast-enhanced spiral CT were performed in all patients;10 of 34 cases'imaging data were postprocessed with multi-planarreconstruction,contour re-establishand maximum intensity projectionon blood vessel.

搜集34例经临床证实的继发性门静脉海绵样变性患者的MSCT资料，所有病例均行上腹部螺旋CT平扫及三期增强扫描。10例采用多平面重组、曲面重组、最大密度投影等后处理方法进行血管成像。

The quantities ba are the covariant components of a plane tensor, called the curvature tensor of the surface

baβ是"平面张量"的协变分量，叫做该曲面的曲率张量。

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。

Therefore at each time we get the roots of this cubic equation, we can decide if we keep or reject each root according to the continuity of the curved surface, the method is as follows: If , the relative cubic plane curve is just a circle, this circle can be gotten by solving .

因此在每次求得该一元三次方程的解时，我们根据曲面的连续性来判断这些根的取舍，方法如下：在处，所得的平面曲线就是圆截线，该圆截线可以由相截得到，即。

To achieve the construction of curtain walls and the flat wall surface effects.

能够实现建筑上的平面幕墙和曲面幕墙效果。

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。