非均匀激发介质中螺旋波的演化  

The evolution of spiral waves in inhomogeneous excitable media

作　　者：戴瑜[1] 韦海明[1] 唐国宁[1] 

机构地区：[1]广西师范大学物理科学与技术学院,桂林541004

出　　处：《物理学报》2010年第9期5979-5984,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10765002)资助的课题~~

摘　　要：采用简单的离散可激发介质模型研究了不同性质和形状的小异质性颗粒对螺旋波演化的影响,在小异质性颗粒均匀分布的情况下,螺旋波的失稳与小异质性颗粒的形状、分布密度和性质有关.数值研究结果表明:在适当的条件下,可以观察到稳定螺旋波发生漫游和螺旋波漂移出系统边界现象,首次观察到螺旋波破碎成空间无序的周期变化斑图和破碎成时空有序的迷宫斑图现象,简要讨论了产生这些现象的物理机理.The effect of small heterogeneous grains with different features and shapes on the evolution of spiral wave is investigated by using the simple model of discrete excitable medium. When the small grains are uniformly distributed in a medium,the instability of spiral wave relates to the shape,density and nature of the grain. The numerical results show that under suitable conditions,the heterogeneous grains can lead to the transition from stable spiral wave to meandering spiral wave in the medium in which it occurs,the spiral wave even drifts out of the boundary of system. The periodic pattern with irregular shape and the periodic maze-type pattern have been observed for the first time. The physical mechanism underlying these phenomena is discussed.

关 键 词：元胞自动机 可激发介质 迷宫形斑图 

分 类 号：O415[理学—理论物理]