曲率

We also compare the results of our method with Meyers, and get better results under certain conditions for mean curvatures estimation.

我们也与Meyer的方法做了比较，对于平均曲率的估计，在某些情况下，我们获得了更精确的结果。

As a result, the curvature of the color selection electrode is increased, which has a positive effect on the strength, doming and microphonics of the color selection electrode.

这样一来，色彩选择电极的曲率就变大了，这对色彩选择电极的强度，凸起和颤躁效应都有良好的作用。

The principle of minimum potential energy was used to derive the governing differential equation and corresponding boundary conditions.

分析了压杆屈曲时的几何变形条件，导出了压杆的曲率、变形能和各项外力势的表达式，用最小势能原理导出压杆失稳的微分方程和边界条件。

First,by choosing a control function for a local adaptive optimal neighborhood,the filter window is set in the region with similar normals to avoid the problem of shrinkage and over-smoothing.

首先通过自适应选取最优邻域控制函数来将滤波窗口限制在顶点法向量相近的区域，以防止滤波后模型的收缩和过光顺；然后运用协方差矩阵分析的方法，在最优邻域内计算出各采样点的法向量和曲率；最后以采样点滤波参考平面为基准，分别平滑采样点的法向量和位置，即先对采样点的法向量进行多边平滑，然后根据新的法向量来多边平滑输出各采样点的位置偏移量，最后在法向方向上移动该顶点，以达到降噪的目的。

As a calculation example, the sheet reduction ratio and the distance from the neutral plane to inner boundary are calculated and compared with published data. A fairly good agreement is obtained between the calculated results and the experimental data.

作为算例，得到了理想刚塑性材料的板料厚度、变薄系数以及应变中性层内移系数随板料弯曲内表面曲率半径变化的规律，并与实验数据进行了比较，两者吻合良好。

Direct difference is sensitive to noisy data, so a threshold limitation is given, which can not only filter the result from noisy data but also pick edge points up according men's desire. On the other hand, artificial intelligence is used for segmentation in reverse engineering. Because the essence of segmentation is clustering similar characteristics and self-organizing feature mapping is one function of neural network, SOFM network is used for segmentation in the thesis, coordinates and normal of data points is took as the characteristics vector.

第二种方法，基于双向角度微分的边点提取法，针对三维正交模型采用基于截面线的方式组织数据，此方法比基于曲率半径方法更简洁，不用进行曲面拟合，大大提高了计算速度；计算过程中由数据点的直接差分逼近微分，但直接差分对数据误差敏感，为此，本文提出了阈值过滤的方法，一方面过滤了数据误差在计算结果中引起的噪音，另一方面可以按照设计意图控制边点的提取；来决定是否提取光滑交接的边点。

The algorithm takes into account the relationship between noise and underlying geometric information,such as normal and curvature.

为了更好地去除噪声，并保持模型的突出特征，提出了一种鲁棒的点模型多边滤波器降噪算法，该算法充分考虑了模型表面的法向量、曲率等内蕴几何量和噪声之间的关系。

For keeping the cutting efficiency and balancing of machine tools,the method for adjustment of feed-rate is proposed based on division of normal curvature radius on surface of parts.

为保证数控加工中的切削效率和机床运动的平稳性，提出了基于曲面曲率划分的进给速度修正方法。

So the offset point position can be adjusted adaptively as the normal curvature of surface changes along the offsetting direction.

因此偏置点的位置能够随着偏置方向曲面法曲率的变化自适应地调整。

Results:(1) The corneal curvature normal value of 3～15 children is 7.79 mm,which is 0.02 mm longer than the value reported in the ophthalmology literatures.

结果：(1)3～15岁儿童角膜正常曲率半径K值为7.79mm，较成人正常值7.77mm长0.02mm。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。