翻訳と辞書 Words near each other ・ Contrast (statistics) ・ Contrast (video game) ・ Contrast (vision) ・ Contrast bath therapy ・ Contrast chord ・ Contrast effect ・ Contrast fabric ・ Contrast Media & Molecular Imaging ・ Contrast medium ・ Contrast ratio ・ Contrast resolution ・ Contrast Rocks ・ Contrast seeker ・ Contrast set ・ Contrast set learning ・ Contrast transfer function ・ Contrast-enhanced ultrasound ・ Contrast-induced nephropathy ・ Contrast-to-noise ratio ・ Contrasta ・ Contrasting and categorization of emotions ・ Contrastive ・ Contrastive analysis ・ Contrastive distribution ・ Contrastive focus reduplication ・ Contrastive linguistics ・ Contrastive rhetoric ・ Contrastivism ・ Contrasts ・ Contrasts (Aziza Mustafa Zadeh album) 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 Contrast transfer function ： ウィキペディア英語版 Contrast transfer function The contrast transfer function〔Spence, John C. H. (1988 2nd ed) ''Experimental high-resolution electron microscopy'' (Oxford U. Press, NY) ISBN 0195054059.〕〔Ludwig Reimer (1997 4th ed) ''Transmission electron microscopy: Physics of image formation and microanalysis'' (Springer, Berlin) (preview ).〕〔Earl J. Kirkland (1998) ''Advanced computing in electron microscopy'' (Plenum Press, NY).〕 mathematically describes how aberrations in a transmission electron microscope modify the image of a sample. This contrast transfer function (CTF) sets the resolution of High-Resolution Transmission Electron Microscopy (HRTEM), also known as phase contrast TEM. By considering the recorded image as a CTF-degraded true object, describing the CTF allows the true object to be reverse-engineered. This is typically denoted CTF-correction, and is vital to obtain high resolution structures in three-dimensional electron microscopy, especially cryo-electron microscopy. Its equivalent in light-based optics, is the optical transfer function. ==Phase Contrast in HRTEM== The contrast in HRTEM comes from interference in the image plane between the phases of scattered electron waves with the phase of the transmitted electron wave. When an electron wave passes through a sample in the TEM, complex interactions occur. Above the sample, the electron wave can be approximated as a plane wave. As the electron wave, or wavefunction, passes through the sample, both the phase and the amplitude of the electron beam is altered. The resultant scattered and transmitted electron beam is then focused by an objective lens, and imaged by a detector in the image plane. Detectors are only able to directly measure the amplitude, not the phase. However, with the correct microscope parameters, the phase interference can be indirectly measured via the intensity in the image plane. Electrons interact very strongly with crystalline solids. As a result, the phase changes due to very small features, down to the atomic scale, can be recorded via HRTEM. 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「Contrast transfer function」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.