1. Postdoctoral Research Associate, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996.
2. Fred Peebles Professor and Head, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996 (corresponding author).
3. Professor, Dept. of Electrical Engineering and Computer Science, Univ. of Tennessee, Knoxville, TN 37996.
4. Chief Scientist, Marsh Imaging and Visualization, Denver, CO 80238.
5. Beam Line Scientist, Helmholtz Center Berlin for Materials and Energy, 14109 Berlin, Germany.
6. Imaging Group Leader, Helmholtz Center Berlin for Materials and Energy, 14109 Berlin, Germany.