查询词典 polar circle

The value of polar resources,scientific research and environmental is meaningful to human future.Above all,huge number of mineral and biological resources as well as the channel resources which would change the framework of the world.All of this,come into notice to the worl.Along with increasing acuity issue of the scarcity of resources and the energy crisis etc.Many countries adopt active polar policy to advance native political status and protect polar rights and interests,Which contains from politics,law,diplomatic,science expedition and environmentalism and etc.

极地的资源价值、科研价值和环境价值对人类的未来发展有重大意义，尤其是数量庞大的矿物和生物资源，以及能够改变世界政治经济格局的航道资源，这些资源近年来引起了世界各国的强烈关注。20世纪以来，随着资源紧缺、能源危机等问题日益尖锐，各国纷纷采取积极的极地政策，从政治、法律、政策、外交、等方面入手，提升本国的极地政治地位、保护在极地的权益、扩大影响力。

Compared with the traditionalroot-locus method, the root-locus method proposed in this dissertation has thefollowing characters:1 The poles location is expressed by polar coordinates.2 The poles location is computed directly.3 The object includes the closed-loop systems and controllers.4 The influence of the parameters on the polar radius and angle can be studied mainly by differential operation.5 The relationship between the polar radius and angle can be studied mainly by differential operation.

与传统的根轨迹法相比，本论文中所采用的根轨迹法具有以下的特点：1 使用极坐标表示极点的位置2 直接计算闭环极点的分布3 研究对象包括闭环系统与控制器4 以微分运算为主要手段，研究了参量的变化对极点的极径和辐角的影响5 以微分运算为主要手段，研究了极点的极径与辐角间的关系本论文从研究Dahlin 控制器振铃现象的成因及消除方法出发，主要进行了以下方面的研究：运用根轨迹法对Dahlin 控制器进行了动态性能分析。

The method comprises the following: a step of calibrating a camera, which is to utilize a Taylor series model to calibrate an omni-directional vision sensor so as to obtain internal parameters of the camera; a step of obtaining epipolar geometric relation, which comprises the steps of calculating an essential matrix between binocular omni-directional cameras and extracting the rotation and translation component of the cameras; a step of correcting an outer polar line, which is to correct the outer polar line of a shot omni-directional stereo image so as to allow a corrected polar quadratic curve to coincide with an image scan line; and a step of three-dimensional reconstruction, which is to carry out feature point matching to the corrected stereo image and calculate the three-dimensional coordinates of points according to matching results.

该方法的步骤包括：相机标定：利用泰勒级数模型对全向视觉传感器进行标定，得到相机内参；对极几何关系求取：包括计算双目全向相机之间的本质矩阵，并从中提取相机的旋转和平移分量；外极线校正：对所拍摄的全向立体图像对进行外极线校正，使校正后的极二次曲线与图像扫描线重合；三维重建：对校正后的立体图像对进行特征点匹配，根据匹配结果计算点的三维坐标。

A new type of polar decomposition—weighted polar decomposition of matrices is presented and defined. Aim at this new matrix decomposition, we prove its uniqueness theorem and obtain its uniqueness conditions, and also investigate the best approximation property of weighted unitary polar factor.

矩阵的极分解和广义极分解一直是矩阵分析研究的重要内容，本文中我们对其进行了横向扩展，提出并定义了一种新的极分解形式—矩阵的加权极分解。

Meanwhile, we also provide methods for computing the weighted polar decomposition, and study error bounds for the approximate generalized positive semidefinite polar factor and perturbation bounds for weighted polar decomposition in various norms.

针对这个新的矩阵分解，我们证明了其唯一性定理，给出了其唯一性条件，讨论了其极因子的最佳逼近性质；同时，我们还探讨了矩阵加权极分解的计算问题，研究了由迭代算法引起的极因子的误差界，极因子在各种范数下的各种形式的扰动界等。

Polar distance; polar diameter.4. Located or found in one of the Polar Regions.

环极的，围绕极地的位于或发现于一个极地区域中的

Located or found in one of the Polar Regions.Polar distance; polar diameter.

环极的，围绕极地的位于或发现于一个极地区域中的

Polar: polar distance; polar diameter.

极距；两极的直径

The U.S.A.,Canada,U.K.,Australia,Russia,Chile and other countries put a lot of manpower and resource in polar re search,set up polar political institution in polar research institution and diplomatic department.The research field covers politics,law,diplomatic,etc.

美国、加拿大、英国、澳大利亚、俄罗斯、智利等国在极地研究上都投入较大的人力和财力，在极地研究机构或者外交部门设立了极地法律与极地研究的相关部门，研究领域涉及极地政治、法律、外交等。1983年，美国白宫发布了罗纳德。

Two polar nuclei move to the micropylar end before sperm is released in a gap between the egg cell and central cell and subsequently taking off cytoplasm one after another. The sperm nucleus moving to the egg nucleus runs faster than the one to the polar nuclei. It fuses with the polar nuclei that are moving towards the antipodal cells at the chalazal end.

精子释放前，两极核移向卵细胞的合点端；两精子释放于卵细胞与中央细胞的间隙后，先后脱去细胞质，然后分别移向卵核和极核，移向卵核的精核快于移向极核的精核；精核与两极核在向反足细胞团方向移动的过程中完成雌雄核融合。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。