1. School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 P. R. China
2. Mechanical and Construction Engineering Faculty of Engineering and Environment Northumbria University Newcastle upon Tyne NE1 8ST UK
3. The 41 st Institute of the Forth Academy China Aerospace Science and Technology Corporation Xi'an 710025 P. R. China
4. School of Chemical and Process Engineering University of Leeds Leeds LS2 9JT UK