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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 Four factor formula ： ウィキペディア英語版 Four factor formula The four-factor formula, also known as Fermi's four factor formula is used in nuclear engineering to determine the multiplication of a nuclear chain reaction in an infinite medium. The formula is $k\_\; =\; \backslash eta\; f\; p\; \backslash varepsilon$ } | $\backslash eta\; =\; \backslash frac$ |- | $f$ | The thermal utilization factor | $\backslash frac\}$ | $f\; =\; \backslash frac$ |- | $p$ | The resonance escape probability | $\backslash frac\}$ | $p\; \backslash approx\; \backslash mathrm\; \backslash left(\; -\backslash frac\; N\_i\; I\_\}\}\; \backslash right)$ |- | $\backslash epsilon$ | The fast fission factor | $\backslash frac\}$ | $\backslash varepsilon\; \backslash approx\; 1\; +\; \backslash frac\backslash frac\; P\_\}$ |- |} The six factor formula defines each of these terms in much more detail. ==Multiplication== The multiplication factor, k, is defined as (see Nuclear chain reaction): $k\; =\; \backslash frac\}$ If k is greater than 1, the chain reaction is ''supercritical,'' and the neutron population will grow exponentially. If k is less than 1, the chain reaction is ''subcritical,'' and the neutron population will exponentially decay. If k = 1, the chain reaction is ''critical'' and the neutron population will remain constant. In an infinite medium, neutrons cannot leak out of the system and the multiplication factor becomes the infinite multiplication factor, $k\; =\; k\_$, which is approximated by the four-factor formula. 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「Four factor formula」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.