Dähmlow Patricia, Hauser Marcus J B
Institute of Experimental Physics, Otto-von-Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Dec;88(6):062923. doi: 10.1103/PhysRevE.88.062923. Epub 2013 Dec 26.
The dynamics of scroll waves with a variable orientation to a vertically oriented gradient of excitability is studied by optical tomography in the ferroin-catalyzed Belousov-Zhabotinsky reaction. An almost perpendicular orientation between the scroll wave and gradient induces a pair of twists of opposite handedness on the scroll wave. The position of the nodal plane formed between the twists is governed by the time delay of the twist formation and therefore leads to a symmetric or asymmetric twisted scroll wave. Larger inclinations between scroll wave and gradient cause a drift of the filament along the reactor wall until it reaches the bottom of the reaction container. In this case, the scroll wave does not twist, suggesting that a drift acts as an alternative mechanism of responding to the gradient.
通过光学断层扫描技术，在亚铁离子催化的贝洛索夫-扎博廷斯基反应中研究了与垂直方向的兴奋性梯度具有可变取向的螺旋波动力学。螺旋波与梯度之间几乎垂直的取向会在螺旋波上诱导出一对相反手性的扭曲。在扭曲之间形成的节点平面的位置由扭曲形成的时间延迟控制，因此会导致对称或不对称的扭曲螺旋波。螺旋波与梯度之间较大的倾斜度会导致细丝沿着反应器壁漂移，直到它到达反应容器的底部。在这种情况下，螺旋波不会扭曲，这表明漂移是对梯度作出响应的一种替代机制。
