The self-collapse phenomenon of dumbbell domains was studied experimentally.The coincidence of the bias field region of self-collapse with that of collapse for both the first and second kinds of dumbbells manifests that two necessary conditions for self-collapse are:(1)sufficiently high number of vertical Bloch lines(VBLs)in their walls and(2)these VBLs are in high compression,and there exists the similarity between self-collapse and collapse in mechanism.
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机译：The Application of the Golden Gate Image in Film and Television Media in History Teaching: Taking the Film "Summer Concerto" as an Example =影视媒体中的金门意象在历史教学的运用--以电影《夏天协奏曲》为例
