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Submitted on: 11 May 2012.
Revised on: 06 September 2012.
Accepted on: 23 September 2012.
___________________International Journal of Surface Science and Engineering
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Submitted on: 16 February 2011.
Revised on: 29 April 2011.
Accepted on: 14 May 2011.
___________________International Journal of Surface Science and Engineering
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