Next Issue
Volume 8, December
Previous Issue
Volume 8, June
 
 
entropy-logo

Journal Browser

Journal Browser

Entropy, Volume 8, Issue 3 (September 2006) – 7 articles , Pages 113-187

  • Issues are regarded as officially published after their release is announced to the table of contents alert mailing list.
  • You may sign up for e-mail alerts to receive table of contents of newly released issues.
  • PDF is the official format for papers published in both, html and pdf forms. To view the papers in pdf format, click on the "PDF Full-text" link, and use the free Adobe Reader to open them.
Order results
Result details
Section
Select all
Export citation of selected articles as:
105 KiB  
Article
Time in Quantum Measurement
by Andreas E. Schlatter
Entropy 2006, 8(3), 182-187; https://doi.org/10.3390/e8030182 - 06 Sep 2006
Cited by 28 | Viewed by 4506
Abstract
Based on a model of quantum measurement we derive an estimate for the external measurement-time. Some interesting consequences will be analyzed. Full article
132 KiB  
Article
Generalized Ideal Gas Equations for Structureful Universe
by Shahid N. Afridi and Khalid Khan
Entropy 2006, 8(3), 175-181; https://doi.org/10.3390/e8030175 - 04 Sep 2006
Cited by 28 | Viewed by 5918
Abstract
We have derived generalized ideal gas equations for a structureful universe consistingof all forms of matters. We have assumed a universe that contains superclusters. Superclusters arethen made of clusters. Each cluster can be further divided into smaller ones and so on. We havederived [...] Read more.
We have derived generalized ideal gas equations for a structureful universe consistingof all forms of matters. We have assumed a universe that contains superclusters. Superclusters arethen made of clusters. Each cluster can be further divided into smaller ones and so on. We havederived an expression for the entropy of such a universe. Our model is rather independent of thegeometry of the intermediate clusters. Our calculations are valid for a non-interacting universewithin non-relativistic limits. We suggest that structure formation can reduce the expansion rateof the universe. Full article
156 KiB  
Other
Entropy and Effective Support Size
by Marian Grendar
Entropy 2006, 8(3), 169-174; https://doi.org/10.3390/e8030169 - 21 Aug 2006
Cited by 28 | Viewed by 6305
Abstract
Notion of Effective size of support (Ess) of a random variable is introduced. A smallset of natural requirements that a measure of Ess should satisfy is presented. The measure withprescribed properties is in a direct (exp-) relationship to the family of R ́nyi’s [...] Read more.
Notion of Effective size of support (Ess) of a random variable is introduced. A smallset of natural requirements that a measure of Ess should satisfy is presented. The measure withprescribed properties is in a direct (exp-) relationship to the family of R ́nyi’s α-entropies which eincludes also Shannon’s entropy H. Considerations of choice of the value of α imply that exp(H)appears to be the most appropriate measure of Ess.Entropy and Ess can be viewed thanks to their log / exp relationship as two aspects of the samething. In Probability and Statistics the Ess aspect could appear more basic than the entropic one. Full article
365 KiB  
Article
On the Propagation of Blast Wave in Earth′s Atmosphere: Adiabatic and Isothermal Flow
by R. P. Yadav, P. K. Agarwal and Atul Sharma
Entropy 2006, 8(3), 143-168; https://doi.org/10.3390/e8030163 - 21 Aug 2006
Cited by 28 | Viewed by 7674
Abstract
Adiabatic and isothermal propagations of spherical blast wave produced due to a nuclear explosion have been studied using the Energy hypothesis of Thomas, in the nonuniform atmosphere of the earth. The explosion is considered at different heights. Entropy production is also calculated along [...] Read more.
Adiabatic and isothermal propagations of spherical blast wave produced due to a nuclear explosion have been studied using the Energy hypothesis of Thomas, in the nonuniform atmosphere of the earth. The explosion is considered at different heights. Entropy production is also calculated along with the strength and velocity of the shock. In both the cases; for adiabatic and isothermal flows, it has been found that shock strength and shock velocity are larger at larger heights of explosion, in comparison to smaller heights of explosion. Isothermal propagation leads to a smaller value of shock strength and shock velocity in comparison to the adiabatic propagation. For the adiabatic case, the production of entropy is higher at higher heights of explosion, which goes on decreasing as the shock moves away from the point of explosion. However for the isothermal shock, the calculation of entropy production shows negative values. With negative values for the isothermal case, the production of entropy is smaller at higher heights of explosion, which goes on increasing as the shock moves away from the point of explosion. Directional study of the shock motion and entropy production show that in both the cases of adiabatic and isothermal flow, shock strength and shock velocity are larger in upward motion of the shock, in comparison to the downward motion of the shock. For adiabatic flow, entropy production is larger in upward motion of the shock; whereas, with negative values, entropy production is smaller in upward motion of the isothermal shock. For the adiabatic case, the profiles of shock strength, shock velocity and entropy production are smooth and have the largest value in vertically upward direction and have the lowest value in vertically downward direction, forming the oval shape. For the isothermal case, the profiles of shock strength and shock velocity show similar trend as that for adiabatic case but the profile of entropy production shows opposite trend. The profiles maintain their shape as the shock moves away. Comparison with observed values of shock velocity shows that isothermal case produces better results in comparison to the adiabatic case. Full article
Show Figures

Figure 1

76 KiB  
Article
Calculations of System Aging through the Stochastic Entropy
by Paolo Rocchi
Entropy 2006, 8(3), 134-142; https://doi.org/10.3390/e8030134 - 11 Aug 2006
Cited by 28 | Viewed by 5383
Abstract
The present research discusses four ‘physical’ models of system and calculates thereliability function during system’s aging and maturity on the basis of the system structure. Full article
20 KiB  
Editorial
Open Access Publishing Policy and Efficient Editorial Procedure
by Shu-Kun Lin, Derek J. McPhee and Francis F. Muguet
Entropy 2006, 8(3), 131-133; https://doi.org/10.3390/e8030131 - 03 Jul 2006
Cited by 28 | Viewed by 7691
165 KiB  
Review
Structuring Information and Entropy: Catalyst as Information Carrier
by Pierre J. Trambouze
Entropy 2006, 8(3), 113-130; https://doi.org/10.3390/e8030113 - 16 Jun 2006
Cited by 28 | Viewed by 6912
Abstract
Many authors tried to exploit the similarities between expressions of the statistical thermodynamics for the entropy and those of Shannon's information theory. In a new approach, we highlight the role of information involved in chemical systems, in particular in the interaction between catalysts [...] Read more.
Many authors tried to exploit the similarities between expressions of the statistical thermodynamics for the entropy and those of Shannon's information theory. In a new approach, we highlight the role of information involved in chemical systems, in particular in the interaction between catalysts and reactants, what we call structuring information. By means of examples, we present some applications of this concept to the biosphere, by visiting a very vast domain going from the appearance of life on earth to its present evolution. Full article
Previous Issue
Next Issue
Back to TopTop