James Paul Holloway

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Monte Carlo methods provide a powerful technique for estimating the average radiation flux in a volume (or across a surface) in cases where analytical solutions may not be possible. Unfortunately, Monte Carlo simulations typically provide only integral results and do not offer any further details about the distribution of the flux with respect to space,(More)
We report the formation of silicon and carbon hetero-nanostructures in an inductively coupled plasma system by a simultaneous growth/etching mechanism. Multi-walled carbon nanotubes were grown during one, three and five hour depositions, while tapered silicon nanowires were progressively etched. The carbon and silicon nanostructures and the interfaces(More)
We are developing a miniature neutron-alpha activation spectrometer for in-situ analysis of chem-bio samples, including rocks, fines, ices, and drill cores, suitable for a lander or Rover platform for Mars or outer-planet missions. In the neutron-activation mode, penetrating analysis will be performed of the whole sample using a y spectrometer and in the(More)
Experiments were performed to mitigate the hard x-ray background commonly observed in backlit pinhole imagers. The material of the scaffold holding the primary backlighter foil was varied to reduce the laser-plasma instabilities responsible for hot electrons and resulting hard x-ray background. Radiographic measurements with image plates showed a factor of(More)
Co-Investigators, University of Michigan: Natasha Andronova, Atmospheric, Oceanic and Space Sciences Krzysztof J. Fidkowski, Aerospace Engineering Bruce Fryxell, Atmospheric, Oceanic and Space Sciences Tamas I. Gombosi, Atmospheric, Oceanic and Space Sciences Smadar Karni, Mathematics Carolyn C. Kuranz, Atmospheric, Oceanic and Space Sciences Edward W.(More)