对于线性荷载作用下外简支环板，引入统一强度理论，进行了极限荷载分析。
For simply supported annular plate under linear load, the limit load analysis was investigated by applying unified strength theory.
就平面向量场的分叉理论而言，极限环分叉的研究已成为人们关注的热点，具有极其重要的理论价值和实际应用价值。
The bifurcations of limit cycles which have important theory values and apply values are generally acknowledged as the hot areas of the research work.
运用庞卡莱—班狄克逊环域理论，得到了极限环存在的充分条件；
The sufficient condition for the existence of limit cycle is proved using the Pioncare-Bendixson theory.
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