How can I tell if a list of 3 or more line segments form a closed region (in 3d)?
我如何能告诉如果一个列表的3个或更多的线段，形成一个封闭的区域(3d) ？
The area and perimeter of the closed region are two important parameters for image analysis and recognition.
区域面积和周长是图像分析与识别过程中所需的两个重要参数。
The results of the experiment using 2D real images show that this method can provide accurately localized and closed region contours.
实验结果表明，该方法可提供精确且封闭的区域轮廓线。
If the line crosses an odd number of path segments, the starting point is inside the closed region and is therefore part of the fill or clipping area.
如果直线和奇数的路径线段交叉，则开始点是在关闭的区域中，因此是填色或裁剪区域的一部分。
So, one of them says the line integral for the work done by a vector field along a closed curve counterclockwise is equal to the double integral of a curl of a field over the enclosed region.
其中一种说明了，在向量场上，沿逆时针方向，向量做的功等于，平面区域上旋度F的二重积分。
The region, he says, is “closed and expensive”.
他认为该地区是“封闭的，烧钱的”。
This one here, the divergence theorem, tells you something similar but now for a region of space bounded by a closed surface.
这个就是散度公式了，告诉大家一些相似的东西，仅仅是对被闭合曲面包围的空间区域来讲的。
Still, it is in crisis mode: more than 4, 800 schools have been closed in the region, medical services are swamped, and testing laboratories are working around the clock.
然而，处于在危机模式：在一些地区超过4,800的学校关闭，医疗机构忙得不可开交，实验室在不停的运作着。
Or, if you have a surface that is not like closed or anything but maybe you will want the flux going up through the region.
或者说，有一个不封闭的曲面,习惯上你会倾向于让通量向上通过这个区域。
While the gender gap in education has significantly closed, it's left the region with a different kind of gender issue - one dealing with boys.
虽然教育中的性别差距已经明显缩小，但它给该地区带来了另一种性别问题，即怎样处理男童的问题。
It is true actually for any closed curve that the flux out of it is going to be twice the area of the region inside.
实际上这对任何闭曲线都适用，向外的通量还是面积的两倍。
So now if I take, see, I can form a single closed curve that will enclose all of this region with kind of an infinitely thin slit here counterclockwise.
如果这么做的话，就能得到区域上的一条闭合曲线,它包围了这个区域。
Many stock markets in the Middle east are closed until Monday for the feast of Eid al-Fitr, making it harder to know how the region will respond to Dubai's woes.
许多中东股市因开斋节休市到下周一才开市，这就更难了解本地区会对迪拜困境作何反应了。
Har Nuur, like other lakes in the region, is a closed-basin lake fed by precipitation.
哈尔湖与本地区的其它湖泊一样，是封闭的一个靠降水给养的盆地湖泊。
New species have been pouring out of the Cardamom region in recent years, because the mountains had been closed off to researchers until the 1990s.
豆蔻山脉长期封闭，直到20世纪90年代研究者才开始踏足，近些年该地区多有新物种被发现。
The border has been closed for months, and there have been several conflicts in the border region this year.
边界已被关闭数月，今年，边境地区多次发生冲突。
It is seen that there is no separated flow and closed streamline in porous media region near the sudden-changed cross-section.
由此表明，在突变截面附近的渗流区域中不存在回流和分离流，也不存在封闭的流线。
The method assigns all poles of the closed system to a special region in the left side of the complex plane to make the closed system obtain a desired degree of stability.
该方法把闭环系统的全部极点配置在复平面左半面的一个特定的区域之内，使闭环系统具有预期的稳定度。
An even larger region is under orange alert for smog, after red alerts late last month forced traffic off the roads and closed some schools.
启动霾橙色预警的地区范围更大。上月底发布的红色预警曾导致车辆限行和学校关闭。
The results revealed a closed return circuit composed of arteriae maxillaries externa, arteriae maxillris interna, vein maxillaris externa and vein maxillaris interna in mandibular region.
结果发现，在下颌区域，颌外动脉、颌内动脉、颌外静脉和颌内静脉形成闭合的循环回路。
The highway traffic network construction in China is a developing trend. The highway systems at all levels in a region constitute the relatively closed network systems.
公路路网化是我国交通建设的一个发展趋势，各种不同等级的公路系统在一个区域内构成了一个相对封闭的路网系统。
There is no independent confirmation of the tolls, and the region has been closed to outsiders.
关于伤亡数字目前还没有得到确认。该地区现在已经向外来人员封闭。
The site was effectively closed to tourists for several years because of guerrilla activity in the region along with concerns about the impact of unregulated tourist traffic.
该网站被关闭，因为有效的游击活动，几年来一直在与游客对旅游交通的影响不受管制的地区的关注。
The objective was to design derivative state feedback controllers so that the closed-loop system was regular, impulse-free, and the closed-loop poles was to be placed in a given region.
考虑连续广义系统的圆形区域极点配置问题，采用微分状态反馈的方法设计控制律使得闭环系统正则，无脉冲且闭环极点位于给定的圆形区域内。
For a single-input bilinear singular system, a stable region of closed loop system around the origin is approached.
对单输入的双线性广义系统，探讨出闭环系统在原点附近的一个稳定域。
Using molecular closed orbit theory and the region splitting and consistent iterative method, we firstly compute the recurrence spectra of NO molecule in strong magnetic field theoretically.
利用分子的闭合轨道理论和分区自洽的迭代方法，首次从理论上计算了NO分子在强磁场中的回归谱。
In this paper is discussed the plain problem for multiply connected region of which the boundaries are closed smooth curves.
本文对边界是封闭光滑曲线的多连通域平面问题进行了研究。
In this paper is discussed the plain problem for multiply connected region of which the boundaries are closed smooth curves.
本文对边界是封闭光滑曲线的多连通域平面问题进行了研究。
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