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Articles 29 records found  previous11 - 20next  jump to record: Search took 0.00 seconds. 
11.
6 p, 82.7 KB Measuring nonequilibrium temperature of forced oscillators / Hatano, Takahiro (Japan Atomic Energy Research Institute. Center for Promotion of Computational Science and Engineering) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física)
The meaning of temperature in nonequilibrium thermodynamics is considered by using a forced harmonic oscillator in a heat bath, where we have two effective temperatures for the position and the momentum, respectively. [...]
2003 - 10.1103/PhysRevE.67.026121
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 67, Number 2 (February 2003) , p. 026121/1-026121/6  
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12.
6 p, 76.5 KB Shear-induced shift of spinodal line in entangled polymer blends / Criado-Sancho, Manuel (Universidad Nacional de Educación a Distancia (Espanya). Departamento de Ciencias y Técnicas Físicoquímicas) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ; Casas Vázquez, José (Universitat Autònoma de Barcelona. Departament de Física) ; Castillo, L. F. del (Universidad Nacional Autónoma de México. Instituto de Investigaciones en Materiales)
We study the shear-flow effects on phase separation of entangled polymer blends by incorporating into the chemical potential a nonequilibrium contribution due to the flow. The results are compared with those of a previous analysis by other authors which did not modify the chemical potential but used a different assumption for the stress tensor of the blend.
2002 - 10.1103/PhysRevE.66.061803
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 66, Number 6 (December 2002) , p. 061803/1-061803/6  
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13.
3 p, 38.5 KB Legendre transform in the thermodynamics of flowing polymer solutions / Casas Vázquez, José (Universitat Autònoma de Barcelona. Departament de Física) ; Castillo, L. F. del (Universidad Nacional Autónoma de México. Instituto de Investigaciones en Materiales) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ; Criado-Sancho, Manuel (Universidad Nacional de Educación a Distancia (Espanya). Departamento de Ciencias y Técnicas Físicoquímicas)
We propose a Legendre transform linking two different choices of nonequilibrium variables (viscous pressure tensor and configuration tensor) in the thermodynamics of flowing polymer solutions. This may avoid some current confusions in the analysis of thermodynamic effects in polymer solutions under flow.
2001 - 10.1103/PhysRevE.63.057101
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 63, Number 5 (May 2001) , p. 057101/1-057101/3  
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14.
4 p, 48.2 KB Breaking of equipartition in one-dimensional heat-conducting systems / Kato, Akiko (Technische Universität Berlin. Institut für Theoretische Physik) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física)
Using information-theoretical methods, we studied how energy equipartition is broken in one-dimensional systems under a heat flow composed of alternating particles of two different masses. The average energy stored in particles of different masses is seen to be different in both ideal gases and harmonic lattices.
2001 - 10.1103/PhysRevE.64.052201
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 64, Number 5 (October 2001) , p. 052201/1-052201/4  
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15.
7 p, 138.6 KB Robustness of the nonequilibrium entropy related to the Maxwell-Cattaneo heat equation / Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ; Casas Vázquez, José (Universitat Autònoma de Barcelona. Departament de Física) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física)
The connection between the Maxwell-Cattaneo heat transport equation and a nonequilibrium entropy is examined through four different thermodynamic approaches, and it is shown that all of them lead to the same form of the nonequilibrium entropy. [...]
2008 - 10.1103/PhysRevE.77.031110
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 77, Number 3 (March 2008) , p. 031110/1-031110-7  
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16.
13 p, 128.4 KB Diffuse-interface model for rapid phase transformations in nonequilibrium systems / Galenko, Peter (Institut für Raumsimulation (Colònia, Alemanya)) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física)
A thermodynamic approach to rapid phase transformations within a diffuse interface in a binary system is developed. Assuming an extended set of independent thermodynamic variables formed by the union of the classic set of slow variables and the space of fast variables, we introduce finiteness of the heat and solute diffusive propagation at the finite speed of the interface advancing. [...]
2005 - 10.1103/PhysRevE.71.046125
Physical review. E : Statistical, nonlinear, and soft matter physics, Vol. 71, Number 4 (April 2005) , p. 046125/1-046125/13  
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17.
4 p, 252.9 KB Memory and nonlocal effects in heat transport : from diffusive to ballistic regimes / Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
The authors discuss a generalized transportmodel including memory and nonlocal effects, which aims to describe the transition of heat transport from the diffusive regime to the ballistic regime. By using an effective thermal conductivity depending on the Knudsen number, they describe in a single equation the behavior of conductivity in terms of the system size and a reduction in the limit flux through nanoscale devices.
2007 - 10.1063/1.2645110
Applied physics letters, Vol. 90, Issue 8 (February 2007) , p. 083109/1-083109/3  
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18.
4 p, 337.7 KB Cross-plane thermal conductivity reduction of vertically uncorrelated Ge/Si quantum dot superlattices / Álvarez Quintana, Jaime (Universitat Autònoma de Barcelona. Departament de Física) ; Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ; Rodríguez-Viejo, Javier (Universitat Autònoma de Barcelona. Departament de Física) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ; Lacharmoise, Paul Dominique (Institut de Ciència de Materials de Barcelona) ; Bernardi, Alessandro (Institut de Ciència de Materials de Barcelona) ; Goñi, Alejandro (Institut de Ciència de Materials de Barcelona) ; Alonso Carmona, Maria Isabel (Institut de Ciència de Materials de Barcelona) ; American Physical Society
A drastic reduction in temperature dependent cross-plane thermal conductivity κ occurs in Gequantum dotsuperlattices (QDSLs), depending on the vertical correlation between dots. Measurements show at least a twofold decrease of κ in uncorrelated dot structures as compared to structures with the same Si spacer of 20nm but good vertical dot alignment. [...]
2008 - 10.1063/1.2957038
Applied physics letters, Vol. 93, Issue 1 (July 2008) , p. 013112/1-013112/3  
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19.
4 p, 256.1 KB Pore-size dependence of the thermal conductivity of porous silicon : a phonon hydrodynamic approach / Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física) ; Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ; Sellitto, A. (University of Basilicata. Department of Mathematics and Computer Science) ; American Physical Society
Phononhydrodynamics is used to analyze the influence of porosity and of pore size on reduction in thermal conductivity in porous silicon, with respect to crystalline silicon. The expressions predict that the thermal conductivity is lower for higher porosity and for smaller pore radius, as a consequence of phononballisticeffects. [...]
2010 - 10.1063/1.3462936
Applied physics letters, Vol. 97, Issue 3 (July 2010) , p. 33103  
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20.
4 p, 357.6 KB Thermodynamic aspects of nonequilibrium current fluctuations / Jou i Mirabent, David, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ; Llebot, Josep Enric, 1953- (Universitat Autònoma de Barcelona. Departament de Física) ; Casas Vázquez, José (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
Starting from a macroscopic nonequilibrium entropy, we obtain an expression for the nonequilibrium fluctuations of the electric current in a metallic resistor. Our method goes further than previous theories of irreversible thermodynamics and, as well as microscopic entropies, it leads to results of the same order of magnitude but not completely coincident with the full nonequilibrium corrections obtained from kinetic methods by Tremblay et al.
1982 - 10.1103/PhysRevA.25.3277
Physical review. A, Vol. 25, Issue 6 (June 1982) , p. 3277-3280  
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