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1 to 10 of 523 Results
Microchannel Gate Temperature Analysis
Aug 1, 1998
Kim, Q.; Kayali, S., 1998, "Microchannel Gate Temperature Analysis", https://hdl.handle.net/2014/20381, ['Journal of Microelectronics Reliability', 'USA'], JPL Open Repository
Photoemission spectra of a GaAs gate material of a metal semiconductor field effect transistor (MESFET) were analyzed to nondestructively assess the submicron-size local gate temperature.
Oceans in Europa and Callisto: Independent Evidence from Magnetic Perturbations
Aug 1, 1998
Khurana, K. K.; Kivelson, M. G.; Stevenson, D. J.; Schubert, G.; Russell, C. T.; Walker, R. J.; Polanskey, S., 1998, "Oceans in Europa and Callisto: Independent Evidence from Magnetic Perturbations", https://hdl.handle.net/2014/20373, ['Nature', 'USA'], JPL Open Repository
Galileo, the first artificial satellite of an outer planet, has been orbiting Jupiter since Dec 7, 1995. The spacecraft encounters one of the four Galilean satellites on each orbit.
Six Years of UARS Microwave Limb Sounder HNO3***sub3*** Observations: Seasonal, Interhemispheric, and Interannual Variations in the Lower Stratosphere
Aug 1, 1998
Santee, M. L.; Manney, G. L.; Froidevaux, L.; Read, W. G.; Waters, J. W., 1998, "Six Years of UARS Microwave Limb Sounder HNO3***sub3*** Observations: Seasonal, Interhemispheric, and Interannual Variations in the Lower Stratosphere", https://hdl.handle.net/2014/20366, ['Journal of Geophysical Research', 'USA'], JPL Open Repository
We present an overview of the seasonal, interhemisphereic, and interannual variations in the distribution of HNO3 in the lower stratosphere based on measurements of gas-phase HNO3 made by the UARS Microwave Limb Sounder (MLS) through six complete annual cycles in both hemispheres...
The Role of Waves in Substorm Onsets
Aug 1, 1998
Tsurutani, B., 1998, "The Role of Waves in Substorm Onsets", https://hdl.handle.net/2014/20396, ['Terra Scientific Publishing Co., Tokyo, Japan', 'Tokyo, Japan'], JPL Open Repository
No abstract provided
Canopy Transpiration in a Chronosequence of Central Siberian Pine Forests
Aug 1, 1998
Reiner, Z.; Ernst-Detler, S.; Christian, W.; Ernst-Eckart, S.; Waldemar, Z., 1998, "Canopy Transpiration in a Chronosequence of Central Siberian Pine Forests", https://hdl.handle.net/2014/20345, ['Global Change Biology', 'USA'], JPL Open Repository
Tree transpiration was measured in 28, 67, 204 and 383 - year old uniform stands and in a multi-cohort stand (140 t0 430) of Pinus sylvestris ssp. sibirica Lebed. in Central Siberia during August of 1995.
A Generation Mechanism for the Polar Cap Boundary Layer Broadband Plasma Waves
Aug 1, 1998
Lakhina, G. S.; Tsurutani, B. T., 1998, "A Generation Mechanism for the Polar Cap Boundary Layer Broadband Plasma Waves", https://hdl.handle.net/2014/20392, ['Journal of Geophysical Research', 'USA'], JPL Open Repository
A generalized dispersion relation for the coupled lower hybrid, whistler, and current convective modes is obtained. It is found that the presence of density gradients, the current convective modes develop a finite real frequency, but at the same time their growth rates are reduce...
Optimal Choice of Material for HEB Superconducting Mixers
Aug 1, 1998
Karasik, B. S.; McGrath, W. R.; Wyss, R. A., 1998, "Optimal Choice of Material for HEB Superconducting Mixers", https://hdl.handle.net/2014/20432, ['IEEE Transactions on Applied Superconductor', 'USA'], JPL Open Repository
We demonstrate that a potential distinction in ultimate performance of phonon-cooled and diffusion-cooled HEB mixers is not due to the cooling mechanisms but rather due to the different properties of available superconductors.
10 - 16 mu broad-band Quantum Well Infrared Photodetector
Aug 1, 1998
Bandara, S. V.; Gunapala, S. D.; Liu, J. K.; Luong, E. M.; Mumolo, J. M.; Hong, W.; Sengupta, D. K.; McKelvey, M. J., 1998, "10 - 16 mu broad-band Quantum Well Infrared Photodetector", https://hdl.handle.net/2014/20333, ['SPIE Proceedings', 'U.S.A.'], JPL Open Repository
A broad-band infrared detector, sensitive over a 10 - 16 mu m spectral range, based on GaAs/A1xGa1-xAs quantum wells grown by molecular beam epitaxy, has been demonstrated.
Deep Space 1 (fact sheet)
Aug 1, 1998
Fisher, D. K., 1998, "Deep Space 1 (fact sheet)", https://hdl.handle.net/2014/20388, ['NASA New Millennium Program Fact Sheet', 'USA'], JPL Open Repository
Exerting less force than does a single sheet of paper resting in your hand, Deep Space 1's ion propulsion system will slowly, yet continuously accelerate the spacecraft well beyond speeds attainable by conventional chemical propulsion.
Analytic Verification of Flight Software
Aug 1, 1998
Dvorak, D., 1998, "Analytic Verification of Flight Software", https://hdl.handle.net/2014/20501, ['IEEE Expert', 'USA'], JPL Open Repository
In the realm of space exploration, the biggest obstacle to widespread application of autonomy in flight software is not technical feasibility; it is doubt about its trustworthiness as a replacement for human-in-the-loop decision-making.
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