1. Department of Mechanical Engineering, Taizhou University, Taizhou 318000, China
2. Department of Physics and Electronic Science, Qiannan Normal College for Nationalities, Guizhou 558000, China e-mail:
3. LGECO, INSA de Strasbourg, 24, Bd de la Victoire, Strasbourg Cedex 67084, France
4. ETS Montréal, 1100, rue Notre Dame Ouest, Montréal, QC H3 1K3, Canada