北京赛车pk拾开奖直播-北京赛车pk拾开奖结果记录-Welcome热购

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发布者溅弗:文明办作者哭陌:发布时间人嫉犀:2019-06-24浏览次数茎耿:792


主讲人鲤惹亭:杨俊敏 河北师范大学教授


时间阑:2019年7月9日9夺瘦羡:00


地点蕉氨:徐汇校区3号楼332报告厅


举办单位催滔:数理学院


内容介绍夯:In this paper, we study the explicit expansion of the first order Melnikov  function near a double homo-clinic loop passing through a nilpotent saddle of  order min a near-Hamiltonian system. For any positive integer m(m ≥1), we derive  the formulas of the coefficients in the expansion, which can be used to study  the limit cycle bifurcations for near-Hamiltonian systems. In particular, for m  =2, we use the coefficients to consider the limit cycle bifurcations of general  near-Hamiltonian systems and give the existence conditions for 10, 11, 13, 15  and 16 (11, 13 and 16, respectively) limit cycles in the case that the  homoclinic loop is of cuspidal type (smooth type, respectively) and their  distributions. As an application, we consider a near-Hamiltonian system with a  nilpotent saddle of order 2and obtain the lower bounds of the maximal number of  limit cycles.

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