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Submitted on: 21 July 2000.
Revised on: 14 September 2000.
Accepted on: 30 October 2000.
___________________Iranian Journal of Science and Technology-Transactions of Mechanical Engineering
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Submitted on: 21 January 1999.
Revised on: 12 May 1999.
Accepted on: 10 June 1999.
___________________Iranian Journal of Science and Technology-Transactions of Mechanical Engineering
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Submitted on: 03 August 2002.
Revised on: 04 September 2002.
Accepted on: 26 October 2002.
___________________Iranian Journal of Science and Technology-Transactions of Mechanical Engineering
Submitted on: 11 June 2006.
Revised on: 30 September 2006.
Accepted on: 15 November 2006.
___________________Iranian Journal of Science and Technology-Transactions of Mechanical Engineering
Submitted on: 29 January 1998.
Revised on: 26 April 1998.
Accepted on: 17 May 1998.
___________________Iranian Journal of Science and Technology-Transactions of Mechanical Engineering