1. Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968 e-mail:
2. Department of Mechanical Engineering, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968 e-mail:
3. Directed Energy Directorate, The Air Force Research Laboratory, Kihei, HI 96753 e-mail: