http://reply.papertrans.cn/1/85/8486/8486-11.png
Submitted on: 08 April 2007.
Revised on: 03 June 2007.
Accepted on: 30 July 2007.
___________________Engineer-Journal of the Institution of Engineers Sri Lanka
http://reply.papertrans.cn/1/85/8486/8486-13.png
Submitted on: 05 October 1999.
Revised on: 31 October 1999.
Accepted on: 06 December 1999.
___________________Engineer-Journal of the Institution of Engineers Sri Lanka
Submitted on: 12 June 2014.
Revised on: 21 September 2014.
Accepted on: 19 October 2014.
___________________Engineer-Journal of the Institution of Engineers Sri Lanka
http://reply.papertrans.cn/1/85/8486/8486-16.png
Submitted on: 15 December 2017.
Revised on: 19 January 2018.
Accepted on: 03 February 2018.
___________________Engineer-Journal of the Institution of Engineers Sri Lanka
http://reply.papertrans.cn/1/85/8486/8486-18.png
Submitted on: 15 January 2009.
Revised on: 19 April 2009.
Accepted on: 29 April 2009.
___________________Engineer-Journal of the Institution of Engineers Sri Lanka
Submitted on: 02 December 2011.
Revised on: 11 January 2012.
Accepted on: 28 February 2012.
___________________Engineer-Journal of the Institution of Engineers Sri Lanka