Michaela R. Johnson

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Using imaging spectrometers at multiple scales, the USGS, in collaboration with the University of Alaska, is examining the application of hyperspectral data for identifying large-tonnage, base metal-rich deposits in Alaska. Recent studies have shown this technology can be applied to regional mineral mapping [1] and can be valuable for more local mineral(More)
We present inelastic neutron scattering measurements of the dynamics of helium adsorbed on carbon nanotube bundles. The goal is to determine the vibrational properties of the 1D and 2D quantum solids that are stabilized on the nanotube bundle surfaces at different fillings of He. The mean square vibrational amplitude in the 1D solid is large with a(More)
This letter presents transistor device results on ultrathin AIN/GaN high-electron mobility transistors grown on a sapphire substrate with high dc/RF performance, including low gate leakage and high transconductance. Devices with 80and 180-nm T-gates are compared, which demonstrate drain-induced OFF-state gate leakage currents below 10<sup>-6</sup> A/mm and(More)
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