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Generalization of the second law for a transition between nonequilibrium states

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PHYSICS LETTERS A
卷 375, 期 2, 页码 88-92

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ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2010.11.002

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The maximum work formulation of the second law of thermodynamics is generalized for a transition between nonequilibrium states. The relative entropy, the Kullback-Leibler divergence between the nonequilibrium states and the canonical distribution, determines the maximum ability to work. The difference between the final and the initial relative entropies with an effective temperature gives the maximum dissipative work for both adiabatic and isothermal processes. Our formulation reduces to both the Vaikuntanathan-Jarzynski relation and the nonequilibrium Clausius relation in certain situations. By applying our formulation to a heat engine the Carnot cycle is generalized to a circulation among nonequilibrium states. (C) 2010 Elsevier B.V. All rights reserved.

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