Forrest M. Hoffman, William W. Hargrove, David J. Erickson, and Robert J. Oglesby
Research partially sponsored by the U.S. Department of Energy, Office of Science, Biological and Environmental Research Programs. This research used resources of the National Center for Computational Sciences at Oak Ridge National Laboratory which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. Support was also provided by a research and development grant from the Science Directorate of NASA/MSFC.