http://reply.papertrans.cn/3/272/27182/27182-31.png
http://reply.papertrans.cn/3/272/27182/27182-32.png
Submitted on: 31 July 2010.
Revised on: 03 September 2010.
Accepted on: 19 September 2010.
Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique
Submitted on: 31 May 2013.
Revised on: 13 June 2013.
Accepted on: 09 July 2013.
Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique
http://reply.papertrans.cn/3/272/27182/27182-35.png
http://reply.papertrans.cn/3/272/27182/27182-36.png