1. a Division of Engineering and Applied Science , California Institute of Technology , Pasadena , California , USA
2. b Combustion Research Facility , Sandia National Laboratories , Livermore , California , USA
3. c Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California , USA
4. d Center for Interdisciplinary Remotely Piloted Aircraft Studies , Naval Postgraduate School , Monterey , California , USA