J. D. Powell, C. S. Coughran; A Stratified Flow Channel, A New Research Tool, Proceedings of MTS/IEEE OCEANS'83 Conference, pp. 287 - 291, August 1983.
John Powell, Thomas Botts, James Powell; Advanced Coal-Fired Turbine Ship Propulsion Systems, Proceedings of MTS/IEEE OCEANS'81 Conference, pp. 1096 - 1099, September 1981.
J. D. Powell, J. R. Powell, C. S. Coughran; CABCY: A New Fuel System For Ships, Proceedings of MTS/IEEE OCEANS'80 Conference, pp. 463 - 468, September 1980.
J. D. Powell, J. R. Powell; SEAS: A System for Undersea Storage of Thermal Energy, Proceedings of MTS/IEEE OCEANS'79 Conference, pp. 527 - 532, September 1979.