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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 Intensity (heat transfer) ： ウィキペディア英語版 Intensity (heat transfer) In the field of heat transfer, intensity of radiation $I$ is a measure of the distribution of radiant heat flux per unit area and solid angle, in a particular direction, defined according to :$dq\; =\; I\backslash ,\; d\backslash omega\backslash ,\; \backslash cos\; \backslash theta\backslash ,\; dA$ where *$dA$ is the infinitesimal source area *$dq$ is the ''outgoing'' heat transfer from the area $dA$ *$d\backslash omega$ is the solid angle subtended by the infinitesimal 'target' (or 'aperture') area $dA\_a$ *$\backslash theta$ is the angle between the source area normal vector and the line-of-sight between the source and the target areas. Typical units of intensity are W·m−2·sr−1. Intensity can sometimes be called radiance, especially in other fields of study. The emissive power of a surface can be determined by integrating the intensity of emitted radiation over a hemisphere surrounding the surface: :$q\; =\; \backslash int\_^\; \backslash int\_^\; I\; \backslash cos\; \backslash theta\; \backslash sin\; \backslash theta\; d\backslash theta\; d\backslash phi$ For diffuse emitters, the emitted radiation intensity is the same in all directions, with the result that :$E\; =\; \backslash pi\; I$ The factor $\backslash pi$ (which really should have the units of steradians) is a result of the fact that intensity is defined to exclude the effect of reduced view factor at large values $\backslash theta$; note that the solid angle corresponding to a hemisphere is equal to $2\backslash pi$ steradians. Spectral intensity $I\_\backslash lambda$ is the corresponding spectral measurement of intensity; in other words, the intensity as a function of wavelength. == See also == * Non-ionising radiation * Emissivity 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「Intensity (heat transfer)」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.