Chen, Wenbo
Zhang, Zhen
Dong, Haiyan
Yan, Fangfang
Funding for this research was provided by:
the National Natural Science Foundation of China (31101878)
the Excellent Youth Foundation of Henan Polytechnic University (J2014-02)
the Dr. Foundation of Henan Polytechnic University (B2010-07)
the youth backbone teacher foundation of Henan Polytechnic University