翻訳と辞書 Words near each other ・ Phasis (butterfly) ・ Phasis (town) ・ Phasis braueri ・ Phasis clavum ・ Phasis pringlei ・ Phase One (Art Ensemble of Chicago album) ・ Phase One (company) ・ Phase One Endurance ・ Phase One Media Pro ・ Phase One Studios ・ Phase Pardhi ・ Phase perturbation ・ Phase plane ・ Phase plug ・ Phase portrait ・ Phase problem ・ Phase qubit ・ Phase resetting in neurons ・ Phase response ・ Phase response curve ・ Phase retrieval ・ Phase rule ・ Phase shaped binary transmission ・ Phase shift module ・ Phase space ・ Phase Space (album) ・ Phase space (disambiguation) ・ Phase Space (story collection) ・ Phase space formulation ・ Phase space method 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 Phase problem ： ウィキペディア英語版 Phase problem In physics the phase problem is the name given to the problem of loss of information concerning the phase that can occur when making a physical measurement. The name itself comes from the field of x-ray crystallography, where the phase problem has to be solved for the determination of a structure from diffraction data. The phase problem is also met in the fields of imaging and signal processing. Various approaches have been developed over the years that attempt to solve it. ==Overview== Light detectors, such as photographic plates or CCDs, measure only the intensity of the light that hits them. This measurement is incomplete (even when neglecting other degrees of freedom such as polarization) because a light wave has not only an amplitude (related to the intensity), but also a phase, which is systematically lost in a measurement. In diffraction or microscopy experiments, the phase part of the wave often contains valuable information on the studied specimen. Note that the phase problem constitutes a fundamental limitation ultimately related to the nature of measurement in quantum mechanics. In X-ray crystallography, the diffraction data when properly assembled gives the amplitude of the 3D Fourier transform of the molecule's electron density in the unit cell. If the phases are known, the electron density can be simply obtained by Fourier synthesis. This Fourier transform relation also holds for two-dimensional far-field diffraction patterns (also called Fraunhofer diffraction) giving rise to a similar type of phase problem. 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「Phase problem」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.