三分

Finally three representative features are picked up, difference sum of the characteristic crack image projection in horizontal and vertical direction, as well as the pixel number of crack sub image.

基本思想是首先将二值化后的裂纹图像进行分块处理，得到一个特征裂纹图像，最后提取三个具有代表性的特征：特征图像在水平方向和垂直方向上的投影的差分累加和Ph，Pv以及裂纹子图像像素总数Num。

The main research contents are stated asfollow: 1. Simplified analysis method of space grids structuresDouble-layer space grids have been assumed as sandwich plate, and are analyzed bythe nontraditional theory of plate with consideration of shear deformation and threegeneralized displacements. Using the theory of energy variation, simplified methodsfor bending, stability and vibration analysis of double-layer space grids have been putforward based upon the idea of split rigidity. The formulas for calculating internalforces, displacements, critical load and natural frequency have been given out. Set thestable cables and bearing cables in hyperbolic paraboloid cable nets are all replaced bytruss-cable to form truss-cable nets structures. Natural vibration analysis method fortruss-cable nets structures has been put forward using the energy variation method andRayleigh method.

主要内容包括： 1、空间网格结构静动力简化分析方法把网架结构简化为夹层板，采用考虑剪切变形的具有三个广义位移的平板弯曲理论进行分析，基于分解刚度思想利用能量变分原理提出了网架结构弯曲、稳定与振动分析的简化计算方法，给出了位移、内力、屈曲临界荷载和固有频率的计算公式；将双曲抛物面索网中的稳定索与承重索均用劲性索代替形成劲性索网结构，基于能量变分法和Rayleigh法给出了劲性索网结构固有振动分析的简化计算公式。

Blame it on SimX and DoriftoKids, they're painful to judge, simply because both of these two teams have done great in some aspects, but made some mistakes at other aspects of their run, after concluding their scores, I keep getting the same score between them, no if you watch the replay, you'll notice their runs aren't similar, but they both made a fair share of mistakes in order to share that same score over and over again , I have been reviewing my scores of all teams for 3 times, and reviewed the scores between SimX and DoriftoKids for 5 times, trying desperately to find the little details in which I can deduct the points on, but failed I was, so I thought to myself... why not just let the two teams in....

只能怪SimX和DoriftoKids，这两支车队太难分出优劣了，因为他们在比赛中都在一些环节发挥出色，也在一些环节犯了错误，每次为两队评分后，我总是得到相同的分数，但是如果你看了录像，你会发现他们的跑法是不同的，但是他们犯了差不多的错误以致于每次的评分都相同，所有车队的成绩我都检查了三遍，并且这两支队的成绩检查了五遍，尽全力寻找可以扣分的细节，但是失败了，所以我对自己说，两支队为什么不能都进决赛呢。。。

This paper puts forward the triangle element method for calculating gravity anomaly of three-dimensional sphere-coronal model by using the divergence theorem. In this study, the volume integration was changed into surface integral, a series of triangles were used to fit the surface, and then the Green's formula was adopted to change surface integral into line integral. At the same time, a reasonable calculation program was given.

提出利用高斯公式将体积分变成包围该积分域的全表面积，应用一系列三角形拟合计算表面，然后通过格林公式把对每个三角形的面积分变成对三角形每边的线积分之和的三角元法来计算三度体球冠模型重力异常，同时给出了合理的计算方案。

Because of the condition of 〓 for two neighbour parametricspline surfaces is too strong,here,instead of it,some simple and practicableconditions of 〓 resulted from the general theorem obtained by Prof.LiuDing Yuan in Chapter 1 were proved,and three 〓 triangular splinesurfaces schemes wre presented:one is piecewise cubic spline surface patcheshaving local 〓 and whole 〓 continuity based on the refined HCTtriangulation,another is the same degree spline surface patches but based onthe refined Powell-Sabin triangulation,the third is piecewise quartic splinesurface patches having local 〓 and whole 〓 continuity based on therefined P-S triangulation.

由于对参数曲面，一阶导数连续的要求较强，我们采用第一章从刘鼎元定理导出的简单实用的几何连续条件，讨论了基于HCT加细三角剖分和P-S加细三角剖分上的两种局部达一阶导数连续而整体有一阶几何连续的分片三次样条曲面构造算法，一种局部达二阶导数连续整体有一阶几何连续的分片四次样条曲面构造方法。

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。

This paper presents a novel triangulation algorithm based on the normal information of the surface and the Delaunay triangulation algorithm.

借助于曲面上的法矢信息和三维Delaunay三角剖分算法，该文给出了一种新的散乱点三角剖分算法。

Let us not forget that Cleveland won the series by the slimmest of margins, squeaking out three victories by one point in the best-of-seven set.

而且我们不要忘了骑士击败巫师的整个系列赛的胜负分差都是最小的，在七场四胜制的系列赛，骑士队有三场比赛的胜利都是险胜1分。

While one thick garment is, for most purposes, as good as three thin ones, and cheap clothing can be obtained at prices really to suit customers; while a thick coat can be bought for five dollars, which will last as many years, thick pantaloons for two dollars, cowhide boots for a dollar and a half a pair, a summer hat for a quarter of a dollar, and a winter cap for sixty-two and a half cents, or a better be made at home at a nominal cost, where is he so poor that, clad in such a suit, of his own earning, there will not be found wise men to do him reverence?

一件厚衣服的用处，大体上可跟三件薄的衣服相同，便宜的衣服可以用真正适合顾客财力的价格买到，一件厚厚的上衣五元就可以买到了，它可以穿上好几年，厚厚的长裤两元钱，牛皮靴一元半，夏天的帽子不过一元的四分之一，冬天的帽子六毛两分半，或许还可以花上一笔极少的钱，自己在家里制一顶更好的帽子，那穿上了这样的一套自己辛勤劳动赚来的衣服，哪里还是贫穷，难道会没有聪明人来向他表示敬意吗？

Kuo pitched six solid innings, allowing three hits and one run that came in on a double by Peavy in the fourth.

郭投了稳固的六局，只让三支安打，失一分，而那分是Peavy以一支二垒打在第四局打下的。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。