翻訳と辞書 Words near each other ・ Polar Music ・ Polar Music Prize ・ Polar mutation ・ Polar night ・ Polar Night Halfmarathon ・ Polar Operational Environmental Satellites ・ Polar Opposite ・ Polar orbit ・ Polar organelle ・ Polar organic chemical integrative sampler ・ Polar overdominance ・ Polar Palace Arena ・ Polar Party ・ Polar Pioneer ・ Polar plotter ・ Polar point group ・ Polar Race ・ Polar Record ・ Polar Record Glacier ・ Polar regions of Earth ・ Polar representation ・ Polar Research ・ Polar Research Institute of China ・ Polar rose ・ Polar Rose (facial recognition) ・ Polar route ・ Polar S625x ・ Polar Satellite Launch Vehicle ・ Polar Sea ・ Polar seas Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Polar point group ： ウィキペディア英語版 Polar point group In geometry, a polar point group is a point group in which every symmetry operation leaves more than one point unmoved. Therefore, a point group with more than one axis of rotation or a mirror plane perpendicular to the axis of rotation cannot be polar. A straight line joining unmoved points defines a unique axis of rotation, unless symmetry operations do not allow any rotation at all, such as mirror symmetry, in which case, the polar direction must be parallel to any mirror planes. The space groups associated with a polar point group do not have their origins uniquely determined by symmetry elements.〔 Of the 32 crystallographic point groups, 10 are polar: When materials having a polar point group crystal structure are heated or cooled, they may temporarily generate a voltage called pyroelectricity. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polar point group」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.