Institution: | Department of Civil Engineering, The Technological Institute, Northwestern University, Evanston, Illinois 60201. (On leave from the Department of Civil Engineering, University College of Engineering, Osmania University, Hyderabad, India.);Department of Civil Engineering, The Technological Institute, Northwestern University, Evanston, Illinois 60201.;Department of Mechanics, E32O, Science Complex Building, The University of Wisconsin, Milwaukee, Wisconsin 53201. |