1. PhD FIMechE. Senior Lecturer, Dept. of Mechanical Engineering, The Univ. of Sheffield, Mappin St., Sheffield S1 3JD, U.K. (corresponding author).
2. MEng AMIMechE. Design Engineer, Rolls-Royce Plc, P.O. Box 31, Derby, DE24 8BJ, U.K.
3. PhD MIMechE. EPSRC Advanced Research Fellow, Dept. of Mechanical Engineering, The Univ. of Sheffield, Mappin St., Sheffield S1 3JD, U.K.
4. DPhil FIMechE. Reader, Dept. of Mechanical Engineering, The Univ. of Sheffield, Mappin St., Sheffield S1 3JD, U.K.