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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 Polder tensor ： ウィキペディア英語版 Polder tensor Polder tensor is a tensor used in description of magnetic permeability of ferrites.〔(G. G. Robbrecht, J. L. Verhaeghe, ''Measurements of the Permeability Tensor for Ferroxcube'', Letters to Nature, ''Nature'' 182, 1080 (18 October 1958), ) 〕 The tensor notation needs to be used because ferrimagnetic materials become anisotropic in the presence of magnetizing field. The tensor is described mathematically as:〔(Ricardo Marqués, Ferran Martín, Mario Sorolla, ''Metamaterials with negative parameter: theory, design, and microwave applications, Willey, New Jersey, USA, 2009, page 93 ) ISBN 978-0-471-74582-2〕 :: where: :$\backslash mu\; =\; \backslash mu\_0\; \backslash left(\; 1+\; \backslash frac\; \backslash right)$ :$\backslash kappa\; =\; \backslash mu\_0\; \backslash frac^2\; -\; \backslash omega^2\}$ :$\backslash omega\_0\; =\; \backslash gamma\; \backslash mu\_0\; H\_0\; \backslash$ :$\backslash omega\_m\; =\; \backslash gamma\; \backslash mu\_0\; M\; \backslash$ and $\backslash gamma\; =\; 17.6\; \backslash cdot\; g\; \backslash$ () is a gyromagnetic ratio and ''g'' is a factor between 1.9-2.4 depending on ferrite material. Magnetizing frequency (''f'') is expressed as $\backslash omega\; =\; 2\; \backslash pi\; f$, ''H''0 is a bias field, ''M'' is magnetization and $\backslash mu\_0$ is magnetic permeability of free space. ==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「Polder tensor」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.