摘 要 三维可激发系统中的Winfree湍流态被认为与心室纤维性颤动可能有着密切的关系.如何快速而有效地消除Winfree湍流是理论工作者非常关心的问题.文章作者发展了两种可有效地控制三维可激发系统中Winfree湍流态的方法:(1)局域的周期刺激,即通过小区域内的周期刺激所产生的激发波来消除Winfree湍流;(2)全局的时空微扰,通过对参数的时空调制来消除Wnifree湍流.
Controlling Winfree turbulence in excitable media
ZHANG Hong1 CAO Zhou-jian2 LI Bing-Wei1 WU Ning-Jie1
YING He-Ping1 HU Gang2,
(1 Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, Hangzhou 310027, China)
(2 Department of Physics, Beijing Normal University, Beijing 100875, China)
Abstract It is believed that ventricular fibrillation is related to Winfree turbulence in three-dimensional excitable media and much attention has been directed towards how to eliminate effectively this kind of spatiotemporal chaos. We present two schemes to suppress Winfree turbulence: (1) Localized stimulations; these generate control waves which can successfully suppress existing turbulence and dominate the whole system; (2) Spatiotemporal modulation (traveling modulation) of the excitability; in this case, Winfree turbulence can also be eliminated by choosing suitable control parameters. ......