1 School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an, 710048, P. R. China.
2 Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an, 710048, P. R. China.
3 School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an, 710048, P. R. China. fcqxaut@163.com.
4 Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an, 710048, P. R. China. fcqxaut@163.com.
5 College of Art and Design, Xi'an University of Technology, Xi'an, 710048, P. R. China.
6 School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an, 710048, P. R. China.