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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 Photo-Carnot engine ： ウィキペディア英語版 Photo-Carnot engine A photo-Carnot engine is a Carnot cycle engine in which the working medium is a photon inside a cavity with perfectly reflecting walls. Radiation is the working fluid, and the piston is driven by radiation pressure. A quantum Carnot engine is one in which the atoms in the heat bath are given a small bit of quantum coherence. The phase of the atomic coherence provides a new control parameter.〔(【引用サイトリンク】title=Extracting Work from a Single Heat Bath via Vanishing Quantum Coherence – Marlan Scully, M. Suhail Zubairy, G. S. Agarwal, and Herbert Walther, 299 (5608): 862 – Science )〕 The deep physics behind the second law of thermodynamics is not violated; nevertheless, the quantum Carnot engine has certain features that are not possible in a classical engine. == Derivation == The internal energy of the photo-Carnot engine is proportional to the volume (unlike the ideal-gas equivalent) as well as the 4th power of the temperature (see Stefan–Boltzmann law): $U\; =\; \backslash varepsilon\backslash sigma\; T^\; \backslash ,.$ The radiation pressure is only proportional to this 4th power of temperature but no other variables, meaning that for this photo-Carnot engine an isotherm is equivalent to an isobar: $P\; =\; \backslash frac\; =\; \backslash frac\; \backslash ,.$ Using the first law of thermodynamics ($dU\; =\; dW\; +\; dQ$) we can determine the work done through an adiabatic ($dQ\; =\; 0$) expansion by using the chain rule ($dU\; =\; \backslash varepsilon\; \backslash sigma\; dV\; T^\; +\; 4\; \backslash varepsilon\; \backslash sigma\; V\; T^\; dT$) and setting it equal to $dW\; =\; -P\; dV\; =\; -\backslash frac\; \backslash varepsilon\; \backslash sigma\; T^\; dV\; \backslash ,.$ Combining these gives us $\backslash frac\; T^\; dV\; =\; 4\; V\; T^\; dT$ which we can solve to find $\backslash frac\; =\; const\; \backslash ,.$ .... The efficiency of this reversible engine must be the Carnot efficiency, regardless of the mechanism and so $\backslash eta\; =\; \backslash frac\; \backslash ,.$ 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「Photo-Carnot engine」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.