Supported by the Natural Science Foundation of Anhui Education Committee(KJ2007A003);the"211 Project"for Academic Innovative Teams of Anhui University(KJTD002B);the Doctoral Scientifc Research Project for Anhui Medical University(XJ201022);the Key Project for Hefei Normal University(2010kj04zd);the Provincial Excellent Young Talents Foundation for Colleges and Universities of Anhui Province(2011SQRL126);the Academic Innovative Scientifc Research Project of Postgraduates for Anhui University(yfc100020,yfc100028)
In this paper, the problem of limit cycles for a class of nonpolynomial planar vector felds is investigated. First, based on Liapunov method theory, we obtain some sufcient conditions for determining the origin as the...
Supported by the Natural Science Foundation of Anhui Education Committee(KJ2007A003);the"211 Project"for Academic Innovative Teams of Anhui University(KJTD002B);the Doctoral Scientific Research Project for Anhui Medical University(XJ201022);the Key Project for Hefei Normal University(2010kj04zd);the Provincial Excellent Young Talents Foundation for Colleges and Universities of Anhui Province(2011SQRL126);the Academic Innovative Scientific Research Project of Postgraduates for Anhui University(yfc100020;yfc100028)
Supported by the Natural Science Foundation of China (10471059);the Natural Science Foundation of Anhui Province(070416225);the Natural Science Foundation of Anhui Education Bureau(KJ2007A003);the Faculty Fund of Anhui University
Supported by the Natural Science Foundation of China (10471059);the Natural Science Foundation of Anhui Province(070416225);the Natural Science Foundation of Anhui Education Bureau(KJ2007A003);the Faculty Fund of Anhui University