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There are a total of 14 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Advanced space propulsion concepts
Author(s): Lapointe, Michael R.
Abstract: The NASA Lewis Research Center has been actively involved in the evaluation and development of advanced spacecraft propulsion. Recent program elements have included high energy density propellants, electrode less plasma ...
NASA Center: NASA (non Center Specific)
Publication Year: 1993
Added to NTRS: 2008-06-02
Accession Number: 94N23067; Document ID: 19940018594
The observed day-to-day variability of Mars water vapor
Author(s): Jakosky, Bruce M.; Lapointe, Michael R.; Zurek, Richard W.
Abstract: The diurnal variability of atmospheric water vapor as derived from the Viking MAWD data is discussed. The detection of day to day variability of atmospheric water would be a significant finding since it would place ...
NASA Center: Jet Propulsion Laboratory
Publication Year: 1987
Added to NTRS: 2008-05-30
Accession Number: 89N10797; Document ID: 19890001426
The Effects of a Magnetic Field on the Crystallization of a Fluorozirconate Glass
Author(s): Tucker, Dennis S.; Lapointe, Michael R.; Jia, Zhiyong
Abstract: An axial magnetic field of 0.1T was applied to ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) fibers during heating to the glass crystallization temperature. Scanning electron microscopy and x-ray diffraction were used to identify crystal ...
NASA Center: Marshall Space Flight Center
Publication Year: 2006
Added to NTRS: 2007-02-07
Document ID: 20070001987
Numerical study of cathode emission constraints on cylindrical self-field MPD thruster performance
Author(s): Lapointe, Michael R.
Abstract: A stability equation relating thruster discharge current, argon propellant mass flow rate, and electrode geometry has been solved for a variety of cylindrical self-field MPD thruster configurations and discharge currents. ...
NASA Center: NASA (non Center Specific)
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 93N15370; Document ID: 19930006181; Report Number: E-7416, NAS 1.26:190795, NASA-CR-190795
Review of nondiffracting Bessel beams
Author(s): Lapointe, Michael R.
Abstract: The theory of nondiffracting beam propagation and experimental evidence for nearly-nondiffractive Bessel beam propagation are reviewed. The experimental results are reinterpreted using simple optics formulas, which show that ...
NASA Center: NASA (non Center Specific)
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 91N29917; Document ID: 19910020603; Report Number: E-6480, NAS 1.26:187188, NASA-CR-187188
Low power ground-based laser illumination for electric propulsion applications
Author(s): Lapointe, Michael R.; Oleson, Steven R.
Abstract: A preliminary evaluation of low power, ground-based laser powered electric propulsion systems is presented. A review of available and near-term laser, photovoltaic, and adaptive optic systems indicates that approximately ...
NASA Center: NASA (non Center Specific)
Publication Year: 1994
Added to NTRS: 2005-08-25
Accession Number: 94N23555; Document ID: 19940019082; Report Number: IEPC-93-208, NAS 1.26:194444, NASA-CR-194444
Numerical simulation of cylindrical, self-field MPD thrusters with multiple propellants
Author(s): Lapointe, Michael R.
Abstract: A two-dimensional, two-temperature, single fluid MHD code was used to predict the performance of cylindrical, self-field magnetoplasmadynamic (MPD) thrusters operated with argon, lithium, and hydrogen propellants. A thruster ...
NASA Center: NASA (non Center Specific)
Publication Year: 1994
Added to NTRS: 2005-08-25
Accession Number: 94N24714; Document ID: 19940020241; Report Number: E-8481, NAS 1.26:194458, NASA-CR-194458
Numerical simulation of self-field MPD thrusters
Author(s): Lapointe, Michael R.
Abstract: A fully two dimensional magnetohydrodynamics code was developed to predict self-field, steady-state MPD thruster performance. The governing equations are outlined, and methods of solution are presented. Model predictions are ...
NASA Center: NASA (non Center Specific)
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 91N29832; Document ID: 19910020518; Report Number: AIAA PAPER 91-2341, E-6440, NAS 1.26:187168, NASA-CR-187168
Antiproton powered propulsion with magnetically confined plasma engines
Author(s): Lapointe, Michael R.
Abstract: Matter-antimatter annihilation releases more energy per unit mass than any other method of energy production, making it an attractive energy source for spacecraft propulsion. In the magnetically confined plasma engine, ...
NASA Center: NASA (non Center Specific)
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 89N27700; Document ID: 19890018329; Report Number: AIAA PAPER 89-2334, E-5025, NAS 1.26:185131, NASA-CR-185131
MPD thruster technology
Author(s): Myers, Roger M.; Mantenieks, Maris A.; Lapointe, Michael R.
Abstract: MPD (MagnetoPlasmaDynamic) thrusters demonstrated between 2000 and 7000 seconds specific impulse at efficiencies approaching 40 percent, and were operated continuously at power levels over 500 kW. These demonstrated ...
NASA Center: Glenn Research Center
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 91N32162; Document ID: 19910022848; Report Number: AIAA PAPER 91-3568, E-6569, NAS 1.15:105242, NASA-TM-105242
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