[1] Zhejiang Normal Univ, Inst Nonlinear Phys, Jinhua 321004, Peoples R China
[2] Huzhou Teachers Coll, Inst Sci, Huzhou 313000, Peoples R China
[3] Coll Jinhua Profess Technol, Jinhua 321007, Peoples R China
[4] Zhejiang Normal Univ, Coll Educ Sci & Technol, Jinhua 321004, Peoples R China