Autor: Xiaoliang Geng

Liu Jun holds a doctor degree from Department of Engineering Mechanics, Northwestern Polytechnical University, China.  He is now an associate professor at School of Mechanics and Civil Engineering & Architecture, NWPU.  Zhufeng Yue is a professor at School of Mechanics and Civil Engineering & Architecture, NWPU.  He was a Humboldt Scholar at Ruhr University Bochum in 1999 and Cheung Kung Scholar at NWPU in 2001.  Xiaoliang Geng is an associate professor at School of Mechanics and Civil Engineering & Architecture, NWPU.  Shifeng Wen is an associate professor at School of Mechanics and Civil Engineering & Architecture, NWPU.         Wuzhu Yan is a lecturer at School of Mechanics and Civil Engineering & Architecture, NWPU.