[Zhou, Jian;Li, Lijun] Ctr S Univ Forestry & Technol, Machinery & Elect Engn Coll, Changsha 410004, Hunan, Peoples R China.^[Hu, Yihua] Guangxi Univ Technol, Lushan Coll, Liuzhou 545006, Peoples R China.^[Zhou, Jian;Wang, Mingchao] Kunming Yunnei Power CO LTD, Kunming 650224, Peoples R China.