[Shao, Kai] Henan Univ Sci & Technol, Sch Math & Stat, Luoyang, Peoples R China.
[An, ZC; An, Zicong] Inner Mongolia Univ Technol, Sch Renewable Energy, Ordos, Peoples R China.
[An, ZC; An, Zicong] Inner Mongolia Key Lab New Energy & Energy Storage, Hohhot, Peoples R China.
[Yang, Yan] Henan Univ Sci & Technol, Sch Phys & Engn, Luoyang, Peoples R China.
[Yi, Bin] Changsha Univ Sci & Technol, Sch Math & Stat, Changsha, Peoples R China.