查询词典 vector field

In this paper we discuss the existence of surfaces of rotation about given Gauss curvature function in R 3 and give the position vector field of these surfaces.

讨论了R3 内给定 Gauss曲率函数的旋转曲面的存在性问题并且给出了这类曲面的位置向量场。

In this paper, we discuss the existence problem of rotation surfaces of given Gauss curvature function in H_1~3(-1) and give the position vector field of the surfaces.

中文摘要：本文讨论了三维反de sitter空间H_1~3(-1)中给定Gauss曲率函数的旋转曲面M的存在性问题并给出了这类旋转曲面的位置向量场。

In section three, we mainly discuss the existence problemof rotation surfaces of given Gauss curvature function in H_1~3(-1) and give theposition vector field of the surfaces and obtain theorem one and theorem two.

第三节主要讨论了H_1~3(-1)中给定Gauss曲率函数的旋转曲面M的存在性问题并给出了这类旋转曲面的位置向量场，得到了定理1和定理2。

The Multi-Scale Image Segmentation Algorithm Based on Gaussian Vector Field Snake Model .

基于高斯矢量场的多尺度水平集图像分割算法。

It is emphasized that how to implement the navigation algorithm based on the Vector Field h Histogram in microcontroller.

重点讨论了基于栅格法的导航算法在微控制器系统中的实现。

The third chapter discusses and proves Il"yashenko"s Theorem, that is, if every vertex on the polycycle of an analytic vector field in the real plane is hyperbolic, then limit cycles cannot accumulate on this polycycle.

第三章详细讨论和证明了Il'yashenko定理，即平面解析向量场的多边环上每一顶均为双曲奇点，则此多边环附近不能结集无限多个极限环。

In the second chapter, we deal with the global of systemBy virtue of the abundant results of Lienard equation, integrated with the theory of rotated vector field, we discussed of the number and distribution of limit cycles of the system and obtain its global structure.

第二章讨论了系统的全局结构。利用定性理论中关于Liénard型方程已有的丰富结果及旋转向量场理论讨论了极限环的个数及其相对位置，得到了系统的全局结构。第三章讨论了系统的局部分支。

Firstly,the color image is sharpen by Unsharp Mask to extract detail information,and color scaling is used to strength contrast degree.Secondly,stroke direction is generated by the method of vector field.Finally results of the pencil-drawing are gained by the line integral convolution algorithm.

首先对用户输入的图像进行Unsharp Mask锐化提取细节信息，并进行颜色放大处理以增强对比度，然后采用基于点的向量场技术生成笔画方向，最后应用线积分卷积得到具有素描风格的结果图像。

It should be pointed out that this necessary and sufficient condition isessentially one of the main results in author's doctoral thesis, but, here weonly need the weaker locally Lipschitz condition for both system vectorfield and control vector field.

另外，我们应该指出的是此充要条件本质上是作者博士论文中的主要结果之一，但本文中对系统向量和控制向量都只需要更弱的局部Lipschitz条件。

The second chapter discusses and proves the Revised Dulacs Theorem, that is, if a polycycle of an analytic vector field has a monodromy map, then there is a semi-transversal for which the monodromy map is either flat, semi-regular, or the inverse of a flat.

第二章详细讨论和证明了修正的Dulac定理，即解析向量场的单一多边环，可选取一适当半匀断，使相应的单一变换芽或为平坦芽，或为半正则芽，或为平坦芽的逆。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。