Measurements of kinematical parameters of spiral waves in media of low excitability
Measurements of kinematical parameters of spiral waves in media of low excitability
复制标题
低兴奋性介质中螺旋波运动学参数的测量
DOI：
10.1039/b104485k
复制
发表时间：
2001
影响因子：
3.3
通讯作者：
S. Müller
中科院分区：
文献类型：
--
作者：
O. Kheowan;V. Gáspár;V. Zykov;S. Müller
研究了均匀稳定光照下，光敏Belousov-Zhabotinsky反应混合物薄层中螺旋波的旋转动力学。在可激发介质的给定组成下，当没有或低强度光照射时，螺旋波弯曲，或者当光强度增加到足够大时，螺旋波刚性地旋转。然而，存在一个光强度的临界值，在该临界值以上，介质不支持波的活动，因为它的兴奋性被照明太强烈地降低。在这一临界值附近，测量了刚性旋转螺旋线的基本运动参数(如旋转周期、波长、传播速度和螺旋芯直径)作为照明强度的函数。实验观测结果与基于早先提出的低激发度介质中螺旋波运动学理论的预测是一致的。
The dynamics of spiral waves rotating in a thin layer of the light sensitive Belousov–Zhabotinsky reaction mixture are studied under a homogeneous and steady illumination. At a given composition of the excitable medium, the spiral waves meand, when no or low intensity light is applied, or rigidly rotate, when the light intensity is increased sufficiently. There exists, however, a critical value of light intensity above which no wave activity is supported by the medium, since its excitability is too strongly reduced by the illumination. In the vicinity of this critical value the basic kinematical parameters of rigidly rotating spirals (such as the rotation period, wavelength, propagation velocity, and the diameter of the spiral core) are measured as a function of the illumination intensity. The experimental observations are in good agreement with the predictions based on an earlier proposed kinematical theory of spiral waves in media of low excitability.