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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 Geometric and material buckling ： ウィキペディア英語版 Geometric and material buckling In a nuclear reactor, criticality is achieved when the rate of neutron production is equal to the rate of neutron losses, including both neutron absorption and neutron leakage. Geometric buckling is a measure of neutron leakage, while material buckling is a measure of neutron production minus absorption. Thus, in the simplest case of a bare, homogeneous, steady state reactor, the geometric and material buckling must be equal. ==Derivation== Both buckling terms are derived from the diffusion equation: $-D\; \backslash nabla^2\; \backslash Phi\; +\; \backslash Sigma\_a\; \backslash Phi\; =\; \backslash frac\; \backslash nu\; \backslash Sigma\_f\; \backslash Phi$. where k is the criticality eigenvalue, $\backslash nu$ is the neutrons per fission, $\backslash Sigma\_f$ is the macroscopic cross section for fission, and from diffusion theory, the diffusion coefficient is defined as: $D=\backslash frac$. In addition, the diffusion length is defined as: $L=\backslash sqrt\}$. Rearranging the terms, the diffusion equation becomes: $-\backslash frac\; =\; \backslash frac-1\}\; =\; ^2$. The left side is the material buckling and the right side of the equation is the geometric buckling. 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「Geometric and material buckling」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.