[1] Virginia Tech, CEHMS, Blacksburg, VA 24061 USA
[2] Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA
[3] US Army Combat Capabil Dev Command, Aviat & Missile Ctr, Redstone Arsenal, AL 35898 USA
[4] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA