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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 Von Foerster equation (ecology) ： ウィキペディア英語版 Von Foerster equation (ecology) The von Foerster equation is a linear first-order partial differential equation encountered in several areas of mathematical biology – for example, cell proliferation modeling; it is applied when age structure is an important feature in the mathematical model.〔MURRAY, J.D. Mathematical Biology: an introduction. third edition. Interdisciplinary Applied Mathematics. Mathematical Biology. Spring: 2002.〕 ==Mathematical formula== The mathematical formula can be derived from first principles. It reads: :$\backslash frac\; +\; \backslash frac\; =\; -\; m(a)n,$ where: ''n'' = ''n''(''t'',''a''), ''t'' stands for time and ''a'' for age. ''m''(''a'') is the death in function of the population age; ''n''(''t'',''a'') is the population density in function of age. When ''m''(''a'') = 0, we have:〔 :$\backslash frac\; =\; -\; \backslash frac$ It relates that a population ages, and that fact is the only one that influences change in population density; the negative sign shows that time flows in just one direction, that there is no birth and the population is going to die out. 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「Von Foerster equation (ecology)」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.