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Submitted on: 09 April 2000.
Revised on: 05 May 2000.
Accepted on: 27 May 2000.
___________________Frontiers in Energy---HIGHER EDUCATION PRESS
Submitted on: 02 April 2015.
Revised on: 04 July 2015.
Accepted on: 30 August 2015.
___________________Frontiers in Energy---HIGHER EDUCATION PRESS
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Submitted on: 02 June 2014.
Revised on: 14 July 2014.
Accepted on: 06 August 2014.
___________________Frontiers in Energy---HIGHER EDUCATION PRESS
Submitted on: 21 November 2007.
Revised on: 20 February 2008.
Accepted on: 13 March 2008.
___________________Frontiers in Energy---HIGHER EDUCATION PRESS