曲率半径

Objective: To investigate the method measuring the scapula glenoid radius of curvature with multi-slice spiral CT postprocessing technique.

目的：探讨多层螺旋CT后处理测量肩胛盂曲率半径的方法。

As a result, the contact area of Berkovich indenter will be larger and nanofretting damage will be weaker.

因此，Berkovich 压头在高载下具有更大的等效曲率半径，产生更轻微的纳动损伤。

A new area function is introduced and applied to a Berkovich tip in order to characterize the contact projected area between an indenter and indented material.

为了研究纳米硬度计压针尖端曲率半径对面积函数的影响，提出一个基于几何方法建立的压针面积函数。

Finite element method was used to explore the nanoindentation process of several materials under Berkovich indenter. The simulated nanoindentation results with different tip radii were compared with experiments.

采用有限元方法模拟了纳米压痕中不同曲率半径针尖的压头压入不同材料的加、卸载过程，并对计算结果与实验进行了对比以验证模拟的可靠性。

From the results, the profile error of NURBS interpolation is related to feed velocity and curvature radius in NC machine tools.

仿真结果显示，数控机床NURBS插补的轮廓误差与进给速度及给定曲线的曲率半径有关。

From the results,the profile error of NURBS interpolation is related to feed velocity and curvature radius inNC machine tools.

仿真结果显示，数控机床NURBS插补的轮廓误差与进给速度及给定曲线的曲率半径有关。

The curvature radius was derivated and the contact stress of the three-arc-sect isometric type surface was calculated through the elastic dynamics theory.

应用弹性力学理论，推导出接触点的曲率半径，对三弧段等距型面联接进行接触应力计算。

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。

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。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。