Funding for this research was provided by:
National Natural Science Foundation of China (61672540, 61379057, 61309001)
the Natural Science Foundation of Hunan Province (2017JJ2057)
Project of Education Department of Hunan Province (18A397)
the Science and Technology Project of Yiyang City (YK1645)
Article History
Received: 1 April 2019
Accepted: 23 April 2019
First Online: 20 May 2019