缺陷对周期螺旋波动力学行为的影响  

The Defect Effect on Dynamics of Periodic Spiral Wave

作　　者：宋宣玉[1] 袁国勇[2] 陈光旨[1] 薛郁[1] 

机构地区：[1]广西大学物理科学与工程技术学院,广西南宁530004 [2]河北师范大学物理科学与信息工程学院,河北石家庄050016

出　　处：《广西科学》2006年第1期23-26,共4页Guangxi Sciences

基　　金：国家自然科学基金(10362001;10147201)资助项目

摘　　要：在改进F itzHugh-N agum o模型基础上得到缺陷对周期螺旋波动力学行为影响的研究模型,对缺陷影响周期螺旋波动力学的模型进行数值模拟,研究缺陷影响后周期螺旋波的演化。结果发现,当缺陷的中心位置不动且离波头中心足够远时,半径比较小的缺陷对波头没有影响;随着缺陷半径的增大,波头会小幅度地远离原位置;如果缺陷半径继续增大,则会出现波头大幅度地远离原位置及波头消失的现象;缺陷影响前后螺旋波波头的周期不变。The defect effect on the dynamics of periodic spiral wave using modified FitzHugh Nagumo model is studied in detail. It is found that, when the center of the defect is determined and far enough away from the center of the spiral tip and if the radius of the defect is short,then there is no affect on the tip. Increasing the defect radius, the tip will be forced slightly away from the original position. While the radius of the defect is further extended, there will be a phenomenon that the tip is moved sharply away from the original position and the tip is vanished. The tip period of spiral wave was changless,during the defect effect on dynamics of periodic spiral wave.

关 键 词：周期螺旋波 缺陷 波头 动力学行为 

分 类 号：O415.5[理学—理论物理] O414[理学—物理]