Acknowledgments-The financial support from NASA;
Lewis Research Center;
under Grant.NAG 3-23;
partial support from Air Force Office of Scientific Research;
under Grant AFOSR-84-032l and Army Research Office;
Grant D.A.A. G29-84-K-OI84 is gratefully acknowledged. The authors also thank J. Rice for the comments and Mrs Lorena Hobart for her patience in typing the manuscript;