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Titolo: PATTERNFORMATION OUTSIDE OF EQUILIBRIUM
Autore: CROSS MC; HOHENBERG PC;
 Indirizzi:
 CALTECH,DEPT PHYS,11436 PASADENA CA 91125 AT&T BELL LABS MURRAY HILL NJ 07974
 Titolo Testata:
 Reviews of modern physics
fascicolo: 3,
volume: 65,
anno: 1993,
parte:, 2
pagine: 851  1112
 SICI:
 00346861(1993)65:3<851:POOE>2.0.ZU;25
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 RAYLEIGHBENARD CONVECTION; GINZBURGLANDAU EQUATION; TRAVELINGWAVE CONVECTION; COUPLEDMAP LATTICES; SELFORGANIZED CRITICALITY; BINARYFLUID MIXTURES; BELOUSOVZHABOTINSKII REACTION; TAYLOR VORTEX FLOW; REACTIONDIFFUSIONEQUATIONS; LOW PRANDTL NUMBER;
 Tipo documento:
 Review
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 1237
 Recensione:
 Indirizzi per estratti:



 Citazione:
 M.C. Cross e P.C. Hohenberg, "PATTERNFORMATION OUTSIDE OF EQUILIBRIUM", Reviews of modern physics, 65(3), 1993, pp. 8511112
Abstract
A comprehensive review of spatiotemporal pattern formation in systemsdriven away from equilibrium is presented, with emphasis on comparisons between theory and quantitative experiments. Examples include patterns in hydrodynamic systems such as thermal convection in pure fluids and binary mixtures, TaylorCouette flow, parametricwave instabilities, as well as patterns in solidification fronts, nonlinear optics, oscillatory chemical reactions and excitable biological media. The theoretical starting point is usually a set of deterministic equations of motion, typically in the form of nonlinear partial differential equations. These are sometimes supplemented by stochastic terms representing thermal or instrumental noise, but for macroscopic systems and carefully designed experiments the stochastic forces are often negligible. An aim of theory is to describe solutions of the deterministic equations that are likely to be reached starting from typical initial conditionsand to persist at long times. A unified description is developed, based on the linear instabilities of a homogeneous state, which leads naturally to a classification of patterns in terms of the characteristic wave vector q0 and frequency omega0 of the instability. Type I, systems (omega0 = 0, q0 notequal 0) are stationary in time and periodic in space; type III(o) systems (omega0 notequal, q0 = 0) are periodic in time and uniform in space; and type I(o) systems (omega0 notequal 0, q0 notequal 0) are periodic in both space and time. Near a continuous(or supercritical) instability, the dynamics may be accurately described via ''amplitude equations,'' whose form is universal for each typeof instability. The specifics of each system enter only through the nonuniversal coefficients. Far from the instability threshold a different universal description known as the ''phase equation'' may be derived, but it is restricted to slow distortions of an ideal pattern. For many systems appropriate starting equations are either not known or toocomplicated to analyze conveniently. It is thus useful to introduce phenomenological orderparameter models, which lead to the correct amplitude equations near threshold, and which may be solved analytically or numerically in the nonlinear regime away from the instability. The above theoretical methods are useful in analyzing ''real pattern effects'' such as the influence of external boundaries, or the formation anddynamics of defects in ideal structures. An important element in nonequilibrium systems is the appearance of deterministic chaos. A greal deal is known about systems with a small number of degrees of freedom displaying ''temporal chaos,'' where the structure of the phase space can be analyzed in detail. For spatially extended systems with many degrees of freedom, on the other band, one is dealing with spatiotemporalchaos and appropriate methods of analysis need to be developed. In addition to the general features of nonequilibrium pattern formation discussed above, detailed reviews of theoretical and experimental work onmany specific systems are presented. These include RayleighBenard convection in a pure fluid, convection in binaryfluid mixtures, electrohydrodynamic convection in nematic liquid crystals, TaylorCouette flow between rotating cylinders, parametric surface waves, patterns in certain open flow systems, oscillatory chemical reactions, static and dynamic patterns in biological media, crystallization fronts, and patterns in nonlinear optics. A concluding section summarizes what has and has not been accomplished, and attempts to assess the prospects for thefuture.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 12:19:20