Funding for this research was provided by:
National Natural Science Foundation of China (61601359)
Key Science and Technology Program Funded by Shaanxi Province Science and Technology Bureau (16JS038)
Principal’s Foundation of Xi’an Technological University (XAGDXJJ15003)
Dean’s Foundation of Xi’an Technological University (13GDYJY03)
Article History
Received: 6 January 2018
Accepted: 1 June 2018
First Online: 5 June 2018