Submitted on: 02 November 2009.
Revised on: 30 November 2009.
Accepted on: 22 December 2009.
Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique
Submitted on: 26 April 2002.
Revised on: 04 June 2002.
Accepted on: 22 June 2002.
Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique
Submitted on: 28 June 2014.
Revised on: 08 August 2014.
Accepted on: 14 August 2014.
Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique
Submitted on: 13 May 2010.
Revised on: 28 May 2010.
Accepted on: 25 June 2010.
Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique
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Submitted on: 31 May 2011.
Revised on: 22 June 2011.
Accepted on: 27 June 2011.
Revue Roumaine des Sciences Techniques-Serie Electrotechnique et Energetique
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