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Journals and Conferences
C. Huepe,1 S. Métens,1 G. Dewel,2 P. Borckmans,2 and M. E. Brachet1 1Laboratoire de Physique Statistique de l’Ecole Normale Supérieure, associé au CNRS et aux Universités Paris 6 et 7, 24 Rue Lhomond, 75231 Paris Cedex 05, France 2Service de Chimie-Physique and Center for Nonlinear Phenomena and Complex Systems, CP 231, Université Libre de Bruxelles, 1050… (More)
The paper investigates a chemical reaction-diffusion model in an open flow system. It is shown that such a system may, with particular boundary conditions, exhibit stationary space-periodic structures even in the case of equal diffusion coefficients. This is confirmed through numerical simulations.
Steady spatial self-organization of three-dimensional chemical reaction-diffusion systems is discussed with the emphasis put on the possible defects that may alter the Turing patterns. It is shown that one of the stable defects of a three-dimensional lamellar Turing structure is a twist grain boundary embedding a Scherk minimal surface.
We describe the formation of spatial structures generated by diffusive instabilities in bistable systems. The coupling between the different spatial modes emanating from the two homogeneous steady states can then give rise to self-parametric instabilities favoring the occurrence of resonant rhombic or quasiperiodic structures such as superlattices or… (More)
We investigate the phenomenon of spatial multistability of fronts in thin bistable systems and stress the important role played by the absence of a variational principle. Nonvariational effects allow, for instance, two different immobilized fronts to coexist. The morphological instability of the corresponding nucleating solution can then lead, even in the… (More)
The emergence, growth and stabilization of stationary concentration patterns in a chemical reaction-diffusion system are studied by numerical simulationsof the Lengyel-Epstein model. This model represents a key to understanding the recently obtained Turing structures in the chlorite-iodide-malonicacid system.
Spatial ordering has been observed recently during various photochemical reactions. Convoluted concentration bands first appear near the surface of shallow irradiated solutions. They thereafter extend into the bulk, and finger-like structures spontaneously develop. We discuss here the possible role of double-diffusion effects in the onset of this… (More)
2014 The role of the defects in twodimensional layered structures is analysed. It is shown that the melting of these structures at large amplitudes can be understood within a soliton picture. J. Physique LETTRES 42 (1981) L-361 L-364 Classification Physics Abstracts 05.70L 64.60 47.20 1 er AOUT 1981, Many instabilities lead to twodimensional layered… (More)
Standing-wave patterns observed in the CO + O2 reaction on Pt(110) are described by a model that explicitly takes into account the coupling between the transport of adsorbed CO and the adsorbate-induced structural transformation of the substrate. We show that synchronization of the surface is achieved through nucleation and growth processes even in the… (More)