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p. 152-168
Received: 24 October 2006; in revised form: 26 September 2007 / Accepted: 4 October 2007 / Published: 26 November 2007
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| Download PDF Full-text (256 KB) Abstract: In this paper we present a comparative study of nine photosynthetic pathways bymeans of their thermodynamic performance. The comparison is made by using the thermalefficiency of light-to-chemical energy conversion and the so-called ecological criterionarising from finite-time thermodynamics. The application of both criteria leads tophotosynthesis made by metaphytes and non sulfur purple bacteria as those of bestthermodynamic performance. In spite of the simplicity of our thermodynamic approachsome insights over the low overall efficiency of photosynthesis is suggested.
p. 169-185
Received: 30 April 2007 / Accepted: 12 September 2007 / Published: 29 November 2007
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| Download PDF Full-text (225 KB) Abstract: We shall review different approaches to the entropy of self-gravitating systems inGeneral Relativity. Then we shall discuss in detail the macroscopic approach based on a la `Clausius point of view. Recent developments will be reviewed discussing the aims as well asthe assumptions which the framework is based on.
p. 186-197
Received: 27 August 2007; in revised form: 6 October 2007 / Accepted: 17 December 2007 / Published: 21 December 2007
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| Download PDF Full-text (183 KB) Abstract: A non-endoreversible Curzon and Ahlborn cycle is analyzed by introducing afactor of non-endoreversibility. The form of power output and ecological function, andthe role of this factor is discussed. The Gutkowics-Krusin, Procaccia and Ross method tobuild a general expression for both the power output and the ecological function for thiscycle is used. A numerical analysis of these expresions is made and the results arecompared with other kind of approaches found in the literature of finite timethermodynamics.
p. 198-232
Received: 22 August 2007; in revised form: 2 January 1995 / Accepted: 1 November 2007 / Published: 31 December 2007
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| Download PDF Full-text (301 KB) Abstract: A methodology for the design of an experiment is proposed in order to find asmany schemes as possible with the maximum number of factors with different levels for thesmallest number of experimental runs. An algorithm was developed and homemadesoftware was implemented. The abilities in generation of the largest groups of orthogonalarrays were analyzed for experimental runs of 4, 6, 8, 9, 10, 12, 14, 15, and 16. The resultsshow that the proposed method permits the construction of the largest groups of orthogonalarrays with the maximum number of factors.
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