Supported by the National Natural Science Foundation of China(11071053);the Natural Science Foundation of Hebei Province(A2014207010);the Key Project of Science and Research of Hebei Educational Department(ZH2012080);the Key Project of Science and Research of Hebei University of Economics and Business(2013KYZ01)
Supported by the National Natural Science Foundation of China (11071053);the Natural Science Foundation of Hebei Province (A2010001482);the Key Project of Science and Research of Hebei Education Department (ZH2012080)