http://reply.papertrans.cn/1/51/5079/5079-31.png
http://reply.papertrans.cn/1/51/5079/5079-32.png
Submitted on: 27 March 1998.
Revised on: 14 July 1998.
Accepted on: 14 August 1998.
___________________CHEMICAL AND PETROLEUM ENGINEERING
http://reply.papertrans.cn/1/51/5079/5079-34.png
Submitted on: 18 August 1999.
Revised on: 04 December 1999.
Accepted on: 17 December 1999.
___________________CHEMICAL AND PETROLEUM ENGINEERING
Submitted on: 05 March 2007.
Revised on: 02 May 2007.
Accepted on: 26 June 2007.
___________________CHEMICAL AND PETROLEUM ENGINEERING