基金supported by the National Natural Science Foundation of China(Grant No.11201003)the Provincial Natural Science Research Project of Anhui Colleges(Grant No.KJ2016A263)+1 种基金the Natural Science Foundation of Anhui Province(Grant No.1408085MA07)the PhD Research Startup Foundation of Anhui Normal University(Grant No.2014bsqdjj34)
基金supported by the Provincial Natural Science Research Project of Anhui Colleges(KJ2013A137)the Natural Science Foundation of Anhui Province(1408085MA07)the PhD Research Startup Foundation of Anhui Normal University(2014bsqdjj34) which facilitated the research visit of the first author to McMaster University,Canada