Turing patterns in the Lengyel-Epstein system for the CIMA reaction

Ni, Wei-Ming; Tang, Moxun

doi:10.1090/S0002-9947-05-04010-9

Turing patterns in the Lengyel-Epstein system for the CIMA reaction
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by Wei-Ming Ni and Moxun Tang PDF

Trans. Amer. Math. Soc. 357 (2005), 3953-3969 Request permission

Abstract:

The first experimental evidence of the Turing pattern was observed by De Kepper and her associates (1990) on the CIMA reaction in an open unstirred gel reactor, almost 40 years after Turing’s prediction. Lengyel and Epstein characterized this famous experiment using a system of reaction-diffusion equations. In this paper we report some fundamental analytic properties of the Lengyel-Epstein system. Our result also indicates that if either of the initial concentrations of the reactants, the size of the reactor, or the effective diffusion rate, are not large enough, then the system does not admit nonconstant steady states. A priori estimates are fundamental to our approach for this nonexistence result. The degree theory was combined with the a priori estimates to derive existence of nonconstant steady states.

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