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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 Acoustic contrast factor ： ウィキペディア英語版 Acoustic contrast factor The acoustic contrast factor is a number used to describe the relationship between the densities and the sound velocities (or, equivalently because of the form of the expression, the densities and compressibilities) of two media. It is most often used in the context of biomedical ultrasonic imaging techniques using acoustic contrast agents and in the field of ultrasonic manipulation of particles much smaller than the wavelength using ultrasonic standing waves. In the latter context, the acoustic contrast factor is the number which, depending on its sign, tells whether a given type of particle in a given medium will be attracted to the pressure nodes or anti-nodes. ==Example - particle in a medium== Given the compressibilities $\backslash beta$ and $\backslash beta$p and densities $\backslash rho$ and $\backslash rho$p of the medium and particle, respectively, the acoustic contrast factor $\backslash phi$ can be expressed as :$$ \phi = }-} For a positive value of $\backslash phi$, the particles will be attracted to the pressure nodes, and vice versa. 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「Acoustic contrast factor」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.