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Entropy, Volume 7, Issue 3 (September 2005) – 3 articles , Pages 172-198

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69 KiB  
Article
Entropy, Fluctuation Magnified and Internal Interactions
by Yi-Fang Chang
Entropy 2005, 7(3), 190-198; https://doi.org/10.3390/e7030190 - 28 Aug 2005
Cited by 10 | Viewed by 7321
Abstract
Since fluctuations can be magnified due to internal interactions under a certain condition, the equal-probability does not hold. The entropy would be defined as S(t)=-k Σr Pr(t) ln Pr(t). From this or S=k ln Ω in an [...] Read more.
Since fluctuations can be magnified due to internal interactions under a certain condition, the equal-probability does not hold. The entropy would be defined as S(t)=-k Σr Pr(t) ln Pr(t). From this or S=k ln Ω in an internal condensed process, possible decrease of entropy is calculated. Internal interactions, which bring about inapplicability of the statistical independence, cause possibly decreases of entropy in an isolated system. This possibility is researched for attractive process, internal energy, system entropy and nonlinear interactions, etc. An isolated system may form a self-organized structure probably. Full article
67 KiB  
Editorial
The FIS2005 Conference in Paris
by Michel Petitjean
Entropy 2005, 7(3), 188-189; https://doi.org/10.3390/e7030188 - 19 Jul 2005
Cited by 2 | Viewed by 3604
Abstract
The FIS2005 - Third Conference on the Foundations of Information Science - has been held in Paris, 4-7 July 2005.[...] Full article
134 KiB  
Article
Exergy Analysis and Second Law Efficiency of a Regenerative Brayton Cycle with Isothermal Heat Addition
by Naser M. Jubeh
Entropy 2005, 7(3), 172-187; https://doi.org/10.3390/e7030172 - 5 Jul 2005
Cited by 31 | Viewed by 16144
Abstract
The effect of two heat additions, rather than one, in a gas turbine engine is analyzed from the second law of thermodynamics point of view. A regenerative Brayton cycle model is used for this study, and compared with other models of Brayton cycle. [...] Read more.
The effect of two heat additions, rather than one, in a gas turbine engine is analyzed from the second law of thermodynamics point of view. A regenerative Brayton cycle model is used for this study, and compared with other models of Brayton cycle. All fluid friction losses in the compressor and turbine are quantified by an isentropic efficiency term. The effect of pressure ratio, turbine inlet temperature, ambient temperature, altitude, and altitude with variable ambient temperature on irreversibility "exergy destroyed" and second law efficiency was investigated and compared for all models. The results are given graphically with the appropriate discussion and conclusion. Full article
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