1. Associate Prof., Civ. Eng. Dept., Colorado Agri. and Mech. College, Fort Collins, Colo.
2. Associate Prof., National Hunan Univ., Changsha, Hunan, China.
3. Research Engr., Fuels Div., Battelle Menrnrial Inst., Colu1nbus, Ohio.
4. Director, Iowa Inst. of Hydr. Research, State Univ. of Iowa, Iowa City, Iowa.