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Entropy, Volume 9, Issue 4 (December 2007) – 4 articles , Pages 152-232

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301 KiB  
Article
Design of Experiments: Useful Orthogonal Arrays for Number of Experiments from 4 to 16
by Sorana D. Bolboacă and Lorentz Jäntschi
Entropy 2007, 9(4), 198-232; https://doi.org/10.3390/e9040198 - 31 Dec 2007
Cited by 68 | Viewed by 10686
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 [...] Read more.
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. Full article
183 KiB  
Article
On Optimization of a Non-Endorreversible Curzon-Ahlborn Cycle
by Delfino Ladino-Luna
Entropy 2007, 9(4), 186-197; https://doi.org/10.3390/e9040186 - 21 Dec 2007
Cited by 15 | Viewed by 6790
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 [...] Read more.
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. Full article
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225 KiB  
Review
Geometric Entropy of Self-Gravitating Systems
by Lorenzo Fatibene, Marco Ferraris, Mauro Francaviglia and Silvio Mercadante
Entropy 2007, 9(4), 169-185; https://doi.org/10.3390/e9040169 - 29 Nov 2007
Cited by 1 | Viewed by 7068
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 [...] Read more.
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. Full article
256 KiB  
Other
A Simple Thermodynamic Analysis of Photosynthesis
by E. Albarrán-Zavala and F. Angulo-Brown
Entropy 2007, 9(4), 152-168; https://doi.org/10.3390/e9040152 - 26 Nov 2007
Cited by 27 | Viewed by 13257
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 [...] Read more.
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. Full article
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