Submitted on: 19 July 2011.
Revised on: 16 October 2011.
Accepted on: 07 November 2011.
___________________International Journal of Mechanical and Materials Engineering
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Submitted on: 02 August 2005.
Revised on: 13 September 2005.
Accepted on: 11 November 2005.
___________________International Journal of Mechanical and Materials Engineering
Submitted on: 23 February 2009.
Revised on: 05 April 2009.
Accepted on: 06 May 2009.
___________________International Journal of Mechanical and Materials Engineering