Alonso Muñoz, SergioSendiña Nadal, IrenePérez Muñuzuri, VicenteSancho, José M.Sagués i Mestre, Francesc2010-06-092010-06-0920010031-9007https://hdl.handle.net/2445/12813A pacemaker, regularly emitting chemical waves, is created out of noise when an excitable photosensitive Belousov-Zhabotinsky medium, strictly unable to autonomously initiate autowaves, is forced with a spatiotemporal patterned random illumination. These experimental observations are also reproduced numerically by using a set of reaction-diffusion equations for an activator-inhibitor model, and further analytically interpreted in terms of genuine coupling effects arising from parametric fluctuations. Within the same framework we also address situations of noise-sustained propagation in subexcitable media.4 p.application/pdfeng(c) American Physical Society, 2001Química físicaFísica estadísticaDinàmica de fluidsChemistry, Physical and theoreticalStatistical physicsFluid dynamicsinfo:eu-repo/semantics/article507949info:eu-repo/semantics/openAccess