Author(s): |
Shi-min Du, Pingdingshan Power Supply Company, Pingdingshan, Henan,China 467001 Li-wei Duan, Pingdingshan Power Supply Company, Pingdingshan, Henan,China 467001 Jun-yi Zhai, Pingdingshan Power Supply Company, Pingdingshan, Henan,China 467001 |