Funding for this research was provided by:
Natural Science Foundation of Jilin Province (2017JJ2020)
the National Fund Training Program of Hunan City University (2018GP03)
the Science and technology program of education department of Hunan Province (18C0840)
the National innovation training program for college students (201811527003)
Article History
Received: 10 April 2019
Accepted: 5 May 2020
First Online: 22 May 2020