1. Postdoctoral Research Fellow, Dept. of Process and Environmental Engineering, Fibre and Particle Engineering, Faculty of Technology, Univ. of Oulu, P.O. Box 4300, 90014 Oulu, Finland (corresponding author).
2. Postdoctoral Research Fellow, Dept. of Process and Environmental Engineering, Fibre and Particle Engineering, Faculty of Technology, Univ. of Oulu, P.O. Box 4300, 90014 Oulu, Finland.
3. Senior Research Fellow, Dept. of Process and Environmental Engineering, Fibre and Particle Engineering, Faculty of Technology, Univ. of Oulu, P.O. Box 4300, 90014 Oulu, Finland.
4. Professor, Dept. of Process and Environmental Engineering, Fibre and Particle Engineering, Faculty of Technology, Univ. of Oulu, P.O. Box 4300, 90014 Oulu, Finland.