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中文摘要：
本工作利用介质阻挡放电装置,观察到单臂螺旋波、多臂螺旋波与靶波,发现在参数不变的情况下,不同臂数的螺旋波斑图可以相互转化.利用唯象模型模拟了不同臂数螺旋波的演变过程,结果显示：拓扑缺陷（断层）向螺旋波中心移动时,会引起螺旋波臂数的改变,若断层与螺旋波拓扑荷同号,螺旋波臂数增加,若断层与螺旋波拓扑荷反号,螺旋波臂数将减少.
英文摘要：
Spiral patterns with variety of arm-number have been observed in dielectric barrier discharge system. Experimental results show that the topological charge of spiral patterns can be changed when the control parameters keep constant. Transition between different arm-number spirals has been simulated with a phenomenological model. The topological charge of spiral will be changed when topological defect （dislocation） propagates to the center along the spiral. If the spiral and the dislocation have the same sign topological charge, its arm-number will increase, vice versa.
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