单位球面

In this paper we define the concept of Projective Blaschke manifolds and extend the theory of equiaffine differential geometry to the projective Blaschke manifolds. We prved that if M be a complete projective Blaschke n-sphere and its universal covering manifold is isometric to a complete (n+1) dimensional parabolic, elliptic or hyperbolic affine hypersphere, then M is a quotient space of E^n, S^n or D^n by a isometric subgroup of its corresponding spaces.

在这篇文章中我们定义了射影Blaschke流形的概念，将等仿射微分几何的理论推广到了射影Blaschke流形，并证明：如果n维完备射影Blaschke 超球面 M 的通用覆盖流形分别是完备的抛物型、椭圆型或双曲型仿射球，则M分别是n维欧氏空间、n维超球面或n维单位圆盘关于各自空间的一个等距离散子群的商，从而对完备射影Blaschke 超球面进行了分类。

By using the multi-year series of the circulation indices P and C for the closed pressure system on the unit radius spherical surface,three characteristic quantities of annual system centers(around the climatological center C-) are defined.1Average distance r,which is defined as the weighted geometric average distance of the annual system centers C deviating from the climatological center C-(i.e.the center location anomaly C′),is a measurement for distribution area of the system...

用单位半径球面上闭合气压系统环流指数P、C的多年序列，构造了历年系统中心在C-周围分布的3个特征量：1平均距离r，它定义为历年系统中心C偏离于气候中心C-的权重几何平均距离，是系统中心分布区域大小的度量；2压缩系数μ，它描述了历年系统中心分布区域偏离于圆形的程度，是历年系统中心位置分布各向异性的度量；3极大异常方向β，它用系统中心极大异常偏离-C处正东方向的角度，给出了系统中心的主要异常方向。

Poincaré, almost a hundred years ago, knew that a two dimensional sphere is essentially characterized by this property of simple connectivity, and asked the corresponding question for the three dimensional sphere (the set of points in four dimensional space at unit distance from the origin).

大 约在一百年以前，庞加莱已经知道，二维球面本质上可由单连通性来刻画，他提出三维球面（四维空间中与原点有单位距离的点的全体）的对应问题。

Unit steradian, sr.

单位：球面度，sr。

This paper addresses the problem of spherical parameterization, i.e., mapping a given polygonal surface of genus-zero onto a unit sphere.

考虑零亏格网格的球面参数化问题，即将给定的零亏格多边形曲面一一映射到单位球面上。

His boldness lies in realizing that he could eliminate the spherical aberration by placing a thin, very weakly curved lens ("correction plate") of special smooth shape (convex near its middle, concave near its periphery, and flat in between) at the same location as the apertured diaphragm.

他的勇气，就在于实现，他可以消除球面像差放置一个薄，非常弱弯曲镜头的特别顺利形状（凸近其中，凹附近及其周边地区，并在单位之间的）在同位置作为光阑膈肌。

The Shandong Linqing communciation bearing factory beginning constructed in 1991, was one specialized production circular cone Roller bearing, the British system circular cone Roller bearing, outside the spherical surface bearing private enterpriseSince 1996, along with the service development, the product quality enhancement and the service consummation, more and more many overseas customers has started to like our product.

山东临清通联轴承厂始建于1991年，是中国汽车市场定点配套最佳合作诚信单位之一。是一家专业生产圆锥滚子轴承、英制圆锥滚子轴承、外球面轴承的私营企业。自1996年以来，随着业务的发展，产品质量的提高和服务的完善，越来越多的国外客户开始喜欢我们的产品。

The Shandong Linqing communciation bearing factory beginning constructed in 1991, was one specialized production circular cone Roller bearing, the British system circular cone Roller bearing, outside the spherical surface bearing private enterpriseSince 1996, along with the service development, the product quality enhancement and the service consummation, more and more many overseas customers has started to like our product.

山东临清通联轴承厂始建于1991年，是中国汽车市场定点配套最佳合作诚信单位之一。山东临清通联轴承厂是一家专业生产圆锥滚子轴承、英制圆锥滚子轴承、外球面轴承的私营企业。山东临清通联轴承厂自1996年以来，随着业务的发展，产品质量的提高和服务的完善，越来越多的国外客户开始喜欢我们的产品。

There are many situations where observed data are in the form of direction cosines or vectors but with an unknown positive scalar so that only the direction is known.

实际中常有这样的情形，当我们观察到的数据是以方向的形式或者以向量的形式给出但却具有未知的度量单位，因而只知道它们的方向，这时我们观察到的就是球面数据。

Spherical roller bearings are double-row, self-containing units that comprise solid outer rings with a concave raceway, solid inner rings and barrel rollers with cages.

球面滚子轴承是双列，自我包含的单位，包括坚实的外圈与凹面滚，固体和内圈与辊每桶笼。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。