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Digitale Medien

The role of defects in the transition between different symmetries in convective patterns (1991)

Ciliberto, S. ; Pampaloni, E. ; Perez-Garcia, C.

Springer

Journal of statistical physics 64 (1991), S. 1045-1058

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ISSN: 1572-9613

Schlagwort(e): Rayleigh-Bénard convection ; patterns ; defects ; Ginzburg-Landau equation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The properties of the transition between two patterns with different symmetries are studied in an experiment on thermal convection in a fluid layer heated from below. The defect structure is also analyzed and it is found that the unstable phase is present in the defect cores. The experimental results are in agreement with a model of three coupled Ginzburg-Landau equations.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01048813

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Digitale Medien

A nonequilibrium thermodynamic description of dilute polymer solutions (1989)

Pérez-García, C. ; Casas-Vázquez, J. ; Lebon, G.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 1807-1821

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ISSN: 0887-6266

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The purpose of this paper is to justify the well-known relaxation spectra observed in dilute polymer solutions from extended irreversible thermodynamics. This is performed by elevating the viscous stress tensor to the status of independent variable, in addition to the usual variables, like temperature and mass density. In particular, it is shown that our thermodynamic description encompasses the Rouse and Zimm models. Memory functions for the longitudinal and transverse correlation functions are derived and analyzed within the frame work of molecular hydrodynamics.