Funding for this research was provided by:
Natural Science Foundation of Shanxi Province (201701D21059)
an Art Disciplinary Project of Shanxi Province (2017F06)
the 13th Five-Year Education Science Project of Shanxi Province (GH-17059)
Article History
Received: 6 August 2018
Accepted: 21 November 2018
First Online: 27 November 2018