出云

Boundary features are the boundary lines of a group of points distributed on a fitting feature.

边界特徵之萃取理论是利用拟合特徵所给予之资讯，找出属於边界之点云资料，再由这些边界点云资料计算出边界特徵。

In addition, a statistical algorithm was also proposed, which can detect the given shape effectively and supply important premise to position hailstorm area.

另外，还针对雹云的形状特征，提出了一种基于码字的统计计算方法，该方法能够有效鉴别出雹云的特定形状，为定位落雹区提供了重要前提。

Sequence matching To achieve the coordinate system's unification between two point clouds, the key lies in calculating seven transformation parameters, which require not less than three homonymous points.

序列拼接实现两站点云之间的空间坐标系的统一，关键在于计算出转换模型中的七个转换参数，为此要求两站点云中存在不少于三对不共线的同名点。

A comparison between microphysical characteristics derived from 3-D cloud model and the results from TRMM TMI and PR products show that the selected cloud model gives a relatively realistic hydrometeor profiles.

由三维云模式得到的微物理特征与由微波图像仪TMI和PR产品提供的结果之间的对比表明，所选用的云模式能够给出相对真实的水汽凝结体廓线。

Based on photogrammetry theory , digital close-range industrial photogrammetry software named by XJTUDP software had been exploitured,it mought calculate un-coded points and coded-points fixed on the surface of large parts,it took a solid basement for the fusion of much pieces point cloud.

为适应对大型工件的快速精确测量，提出一种工业数字近景三维摄影测量技术和三维光学密集点云测量技术组成的光学测量新方法，基于摄影理论开发出XJTUDP近景工业摄影测量系统软件，可以计算出大型工件表面粘贴的编码点和非编码点，为后期点云的多视拼合奠定了基础。

It is presented that indirect assimilation experiment of CMW data from TCFM method improves effectively not only on vertical velocity field but for precipitation.4 Based on theory analysis, E-Ir relationship is brought forward with two electrification mechanisms. One is inductive mechanism, i.e., cloud particles collide with precipitation particles then flick away, the other is noninductive mechanism because of different temperature, i.e., bigger supercooled cloud particles collide and freeze with hail particles combined with ice scraps. By means of CINRAD and FY2C data assimilation, precipitation intensity Ir can be obtained, then electric field intensity E, discharge time and locations can be achieved with supposed threshold 300KV/m. Though it can not distinguish between IC (Intra-Cloud) lightning and CG (Cloud-to-Ground) lightning, results are still comparable to LLS observations.5 Example analysis shows that the relationship between precipitation data from AMS and CG data from LLS is not very clear.

同化实验对于台风眼区的螺旋形雨带贡献显著，说明TCFM云导风资料同化实验不仅有效调整了模式的垂直速度场，还对降水模拟有了明显改善。4通过理论分析，利用云粒子与极化降水粒子碰撞并弹离的感应起电机制和较大过冷云滴与雹粒碰冻并产生冰屑的温差起电机制下得到的E-Ir，由雷达、卫星遥感资料直接和间接同化模拟得到Ir，来反推E，了解雷暴云中闪电强度的平面分布，设置放电阈值为300KV/m，推算出放电的位置和首次发生闪电的时间。

Based on the example of turbine reverse engineering , the general procedure that can be used to translate the physical object into CAD datum by Surfacer software is determined in this paper1 By going deep into the vector of point-cloud , it's parametrization can be gained by adopting the precept of accumulating chordal parametrization1 According to the principle of const ructing curve using the least square method , the high quality-curve can be gained by modifying curve's parameter1 This paper also empha2sizes on some methods about processing point-cloud , const ructing curve and const ructing surface1 And it can provide several methods to const ruct high quality2CAD model for mould machining1

此栏目为免费论文，可自行复制获取，如需要其他完整论文，可点击论文范文查找摘要本文就涡轮反求造型的实例，采用Surfacer 软件规划出由实物转化为工程CAD 资料的一般流程。在深入分析点云数据的矢量方向基础上，采用积累弦长参数化方案实现点云的参数化；根据最小二乘法曲线拟合原理，修改曲线参数获得高品质曲线；并重点论述了点云处理、曲线生成、建构曲面的方法，为模具加工提供了建构高品质CAD 模型的有效途径。

In this paper, we provide an algorithm to detect the boundary points. Obviously, if a point is a boundary point, then its circumambient points will distribute only on one side or around a corner.

该算法能检测出点云数据的内、外边界特征点，同时对边界上的点进行排序，检测出边界特征点中的过渡点，最后构建点云轮廓的边界多边线。

Red is my reward winter morning, the fun, then pink pink sun cloud crowding in from the folder to his face, showing it only in the middle of winter, some transparent pink, red, naive, red, cute, red, honest , bright red, can be red, he also disclosed a trace of a strong, beautiful and great, and when the sun is completely out of the cold when the clouds, but also a different atmosphere.

早上赏红是我冬日的乐趣，那粉红粉红的太阳从夹挤的云中露出脸来，显出了它只有在冬日中才透有的淡红，红得天真，红得可爱，红的淳朴，红得亮丽，可红中又透出了一丝坚强，美丽极了，而当太阳从寒冷的云中完全出来时，又是一种不同的气氛。

Such low-level clouds, called stratus clouds, occur below 6,500 feet (2,000 meters) and often bring rain or snow.

这种低层次的云，气象学称：《层云》云，出现在下面6500英尺（ 2000米），而且往往带来雨或雪。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷