Funding for this research was provided by:
The Foundation of the Educational Commission of Tianjin (No. 20130801)
General Project of Tianjin Municipal Science and Technology Commission (No. 15JCYBJC15600)
Major Project of Tianjin Municipal Science and Technology Commission (No. 15ZXDSGX00030)
The United Foundation of General Technology and Fundamental Research (No. U1536122)
Article History
Received: 8 January 2018
Revised: 20 February 2018
Accepted: 22 February 2018
First Online: 8 March 2018