In a lossless unit, any change from a polarization state to another polarization state is pointed out to be corresponded to a rotation of Poincare sphere relative to the diameter.

指出在一个无损耗单元内，从一个偏振态到另一个偏振态的任何变化，都对应着庞加莱球相对于直径的一个旋转。

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In the present paper, we mainly study the codimension reduction problems for submanifolds with parallel unit mean curvature vector in a sphere.

本文将着重研究更为一般的具有平行单位平均曲率向量子流形的有关几何问题。

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Las Vegas, Nevada (CNN) -- Pioneer became the latest company to jump on the car-tech bandwagon on Wednesday when it unveiled a new car stereo unit that has maps with local searches, a "music sphere" and tunes from the Internet radio site Pandora.

CNN: Pioneer to launch high-tech car stereo