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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 Carr index ： ウィキペディア英語版 Carr index The Carr index (also: Carr's index〔Bowker, Michael I. & P. Heinrich Stahl. 2008. "Preparation of Water-Soluble Compounds through Salt Formation." In Camille Georges Wermuth, ed. ''The Practice of Medical Chemistry'', pp. 747–766. Burlington, MA: Elsevier, p. 756.〕 or Carr's Compressibility Index〔Podczeck, Fridun & Brian E. Jones, eds. 2007. ''Pharmaceutical Capsules'111.〕) is an indication of the compressibility of a powder. It is named after the pharmacologist Charles Jelleff Carr (1910–2005).〔〔(In Memoriam: Charles Jelleff Carr, Ph.D., 1910–2005 )〕 It measures the relative significance of interparticle interactions.〔http://www.pharmacopeia.cn/v29240/usp29nf24s0_c616.html〕 The Carr index is calculated by the formula $C=100\backslash frac$, where $V\_B$ is the volume that a given mass of powder would occupy if let settled freely, and $V\_T$ is the volume of the same mass of powder would occupy after "tapping down". It can also be expressed as $C=100(1-\backslash rho\_B/\backslash rho\_T)$, where $\backslash rho\_B$ is the freely settled bulk density of the powder, and $\backslash rho\_T$ is the tapped bulk density of the powder. The Carr index is frequently used in pharmaceutics as an indication of the flowability of a powder. In a free-flowing powder, the bulk density and tapped density would be close in value, therefore, the Carr index would be small. On the other hand, in a poor-flowing powder where there are greater interparticle inter actions, the difference between the bulk and tapped density observed would be greater, therefore, the Carr index would be larger.〔http://www.pharmacopeia.cn/v29240/usp29nf24s0_c616.html〕 A Carr index greater than 25 is considered to be an indication of poor flowability, and below 15, of good flowability. Another way to measure the flow of a powder is the Hausner ratio, which can be expressed as $H=\backslash rho\_T/\backslash rho\_B$. Both the Hausner ratio and the Carr index are sometimes criticized, despite their relationships to flowability being established empirically, as not having a strong theoretical basis. Use of these measures persists, however, because the equipment required to perform the analysis is relatively cheap and the technique is easy to learn. ==References== 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「Carr index」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.