Motion of spiral tip driven by local forcing in excitable media  

作　　者：刘贵泉 应和平 

机构地区：[1]Zhejiang Institute of Modern Physics and Department of Physics,Zhejiang University [2]College of Science,China Jiliang University

出　　处：《Chinese Physics B》2014年第5期123-128,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11274271);the Scientific Research Foundation of Education Bureau of Zhejiang Province,China(Grant No.Y201224250)

摘　　要：We study the motion of a spiral wave controlled by a local periodic forcing imposed on a region around the spiral tip in an excitable medium. Three types of trajectories of spiral tip are observed： the epicycloid-like meandering, the resonant drift, and the hypocycloid-like meandering. The frequency of the spiral is sensitive to the local periodic forcing. The dependency of spiral frequency on the amplitude and size of local periodic forcing are presented. In addition, we show how the drift speed and direction are adjusted by the amplitude and phase of local periodic forcing, which is consistent with a theoretical analysis based on the weak deformation approximation.We study the motion of a spiral wave controlled by a local periodic forcing imposed on a region around the spiral tip in an excitable medium. Three types of trajectories of spiral tip are observed： the epicycloid-like meandering, the resonant drift, and the hypocycloid-like meandering. The frequency of the spiral is sensitive to the local periodic forcing. The dependency of spiral frequency on the amplitude and size of local periodic forcing are presented. In addition, we show how the drift speed and direction are adjusted by the amplitude and phase of local periodic forcing, which is consistent with a theoretical analysis based on the weak deformation approximation.

关 键 词：spiral wave local forcing resonant drift weak deformation approximation 

分 类 号：O415[理学—理论物理]