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The effect of a bilayer area on the electronic response to environmental gating of a monolayer graphene Hall bar device is investigated using room temperature magnetotransport and scanning Kelvin probe microscopy measurements in a controlled environment. The device is tuned through the charge neutrality point with n–p–n-junctions formed. Scanning Kelvin probe measurements show that the work function...
Our ground-based measurements of martian atmospheric water vapor, made throughout Ls=34° to 249°, 24 September 1998 to 23 November 1999, during Mars year 24 (MY 24), show changes in Mars' humidity on hourly, daily, and seasonal timescales. We made concomitant measurement of nearby CO 2 bands, and when possible, results were corrected for aerosol extinction using aerosol optical depths derived...
Ultra-cold neutrons (UCN), neutrons with energies low enough to be confined by the Fermi potential in material bottles, are playing an increasing role in measurements of fundamental properties of the neutron. The ability to manipulate UCN with material guides and bottles, magnetic fields, and gravity can lead to experiments with lower systematic errors than have been obtained in experiments with cold...
Measurements of martian atmospheric water vapor made throughout L s = 18.0 o -146.4 o (October 3, 1996-July 12, 1997) show changes in Mars humidity on hourly, daily, and seasonal time scales. Because our observing program during the 1996-1997 Mars apparition did not include concomitant measurement of nearby CO 2 bands, high northern latitude data were corrected for...
Observations of lunar sodium were made on November 16–18, 1997, at Asiago and Mount Lemmon Observatories. A small enhancement was observed, and we suggest that it was related to the Leonid shower. Visual observations by members of the Association of Lunar and Planetary Observers and the North American Meteor Network show a peak, a few hours wide, at about 12:50 UT on the 17th. The possible enhancement...
Telescopic observations of Mercury's sodium atmosphere were made to test the theory that two mid-latitude radar-bright spots centered near ∼345° longitude and ∼55° N and ∼25° S are sources of sodium in Mercury's atmosphere. Three important results came from these observations. (1) When the spectrograph slit was placed over, or near, the location of the radar-bright spots, notable sodium enhancements...
We report results of a part of an organized effort of five observing groups to simultaneously observe sodium in the lunar atmosphere. International Lunar Atmosphere Week spanned the week of September 15–22, 1995. Of the seven nights, we experienced four nights with good viewing conditions. We used the Mt. Lemmon Lunar Coronagraph (MLLC) and DARRK spectrograph. Both are especially designed for lunar...
The total ionizing dose (TID) test of the Natel HSRD1056RH synchro/resolver-to-digital converter for the space environment has been completed using the /sup 60/Co source at JPL. A classical 'rebound' effect was observed during time dependent effects (TDE) test due to slight parametric drifts of the internal CMOS circuitry. Circuit analysis suggested a 'quick fix' to this sensitivity which was verified...
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