Results 21 to 30 of about 5,061,650 (325)

The adiabatic piston: a perpetuum mobile in the mesoscopic realm

open access: yesEntropy, 2004
: A detailed analysis of the adiabatic-piston problem reveals, for a finely-tuned choice of the spatial dimensions of the system, peculiar dynamical features that challenge the statement that an isolated system necessarily reaches a time-independent ...
Claudio Conti   +2 more
doaj   +1 more source

Implementing Demons and Ratchets

open access: yesEntropy, 2017
Experimental results show that ratchets may be implemented in semiconductor and chemical systems, bypassing the second law and opening up huge gains in energy production.
Peter M. Orem, Frank M. Orem
doaj   +1 more source

Irreversibility and Second Law [PDF]

open access: yesJournal of Non-Equilibrium Thermodynamics, 1998
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
openaire   +2 more sources

The Deep Physics Behind the Second Law: Information and Energy As Independent Forms of Bookkeeping

open access: yesEntropy, 2004
: Even after over 150 years of discussion, the interpretation of the second law of thermodynamics continues to be a source of confusion and controversy in physics.
Jack S. Semura, Todd L. Duncan
doaj   +1 more source

A Method to Derive the Definition of Generalized Entropy from Generalized Exergy for Any State in Many-Particle Systems

open access: yesEntropy, 2015
The literature reports the proofs that entropy is an inherent property of any system in any state and governs thermal energy, which depends on temperature and is transferred by heat interactions.
Pierfrancesco Palazzo
doaj   +1 more source

Infinite family of second-law-like inequalities [PDF]

open access: yes, 2012
The probability distribution function for an out of equilibrium system may sometimes be approximated by a physically motivated "trial" distribution.
Kolton, Alejandro B.   +2 more
core   +2 more sources

Second Thoughts on the Second Law [PDF]

open access: yes, 2018
We speculate whether the second law of thermodynamics has more to do with Turing machines than steam pipes. It states the logical reversibility of reality as a computation, i.e., the fact that no information is forgotten: nature computes with Toffoli-, not NAND gates.
openaire   +2 more sources

The Second Law and Cosmology [PDF]

open access: yes, 2008
I use cosmology examples to illustrate that the second law of thermodynamics is not old and tired, but alive and kicking, continuing to stimulate interesting research on really big puzzles.
Ahmed Ghoniem   +3 more
core   +1 more source

A Kinetic Perspective on k - ϵ Turbulence Model and Corresponding Entropy Production

open access: yesEntropy, 2016
In this paper, we present an alternative derivation of the entropy production in turbulent flows, based on a formal analogy with the kinetic theory of rarefied gas.
Pietro Asinari   +2 more
doaj   +1 more source

MHD Free Convection and Entropy Generation in a Corrugated Cavity Filled with a Porous Medium Saturated with Nanofluids

open access: yesEntropy, 2018
MHD free convection inside a triangular-wave-shaped corrugated porous cavity with Cu-water nanofluid is numerically studied with the finite element method. The influences of the Grashof number ( 10 4 ≤ Gr ≤ 10 6 ), Hartmann number (
Ali J. Chamkha, Fatih Selimefendigil
doaj   +1 more source

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