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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Narrow escape problem ： ウィキペディア英語版 Narrow escape problem The narrow escape problem is a ubiquitous problem in biology, biophysics and cellular biology. The formulation is the following: a Brownian particle (ion, molecule, or protein) is confined to a bounded domain (a compartment or a cell) by a reflecting boundary, except for a small window through which it can escape. The narrow escape problem is that of calculating the mean escape time. This time diverges as the window shrinks, thus rendering the calculation a singular perturbation problem. == Formulation == The motion of a particle is described by the Smoluchowski limit of the Langevin equation: : $dX\_t=\backslash sqrt\; \backslash ,\; dB\_t+\backslash fracF(x)dt$ where $D$ is the diffusion coefficient of the particle, $\backslash gamma$ is the friction coefficient per unit of mass, $F(x)$ the force per unit of mass, and $B\_t$ is a Brownian motion. 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「Narrow escape 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.