1–20 of 61 hits
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    Direct Observation of Nucleus Structure and Nucleation Pathways

    Vekilov, Peter G. / Yau, S.-T. | NTRS | 2001

    Feasibility Study of MEMS-Based Accelerator Grid Systems for Micro-Ion Engines: Electric Breakdown Characteristics

    Mueller, J. / Pyle, D. / Chakraborty, I. et al. | NTRS | 1999
    Low-temperature (LTO) chemical vapor deposited (CVD) silicon dioxide was investigated for use as an insulator material in microfabricated ...

    Advanced Propulsion for Geostationary Orbit Insertion and North-South Station Keeping

    Oleson, Steven R. / Myers, Roger M. / Kluever, Craig A. et al. | NTRS | 1997
    chemical propulsion apogee engine fuel is reduced in this analysis to allow the use of electric propulsion. A numerical optimizer is used to ...
    Publisher: American Institute of Aeronautics and Astronautics

    Effect of Departure Delays on Manned Mars Mission Selection

    Desai, Prasun N. / Tartabini, Paul V. | NTRS | 1995
    alleviate the IMLEO penalties. Three different classes of missions are analyzed, using chemical and nuclear thermal propulsion systems in the 2000 ...
    Publisher: American Inst. of Aeronautics and Astronautics

    Chemical recombination in an expansion tube

    Bakos, Robert J. / Morgan, Richard G. | NTRS | 1994
    The note describes the theoretical basis of chemical recombination in an expansion tube which simulates energy, Reynolds number, and stream ...

    Lunar missions using advanced chemical propulsion: System design issues

    Palaszewski, Bryan | NTRS | 1994
    To provide the transportation of lunar base elements to the moon, large high-energy propulsion systems will be required. Advanced ...

    Aerothermodynamic methods for a Mars environmental survey Mars entry

    Mitcheltree, R. A. | NTRS | 1994
    Computational fluid dynamics models for the thermodynamics and transport properties used in an equilibrium version of the Langley ...

    Multiblock analysis for Shuttle Orbiter reentry heating from Mach 24 to Mach 12

    Gnoffo, Peter A. / Weilmuenster, K. James / Alter, Stephen J. | NTRS | 1994
    is described. The analysis is performed using the Langley Aerothermodynamic Upwind Relaxation Algorithm with a seven species chemical ...

    Stationary premixed flames in spherical and cylindrical geometries

    Ronney, P. D. / Whaling, K. N. / Abbud-Madrid, A. et al. | NTRS | 1994
    ) environments in a drop tower and an aircraft flying parabolic trajectories to diminish the impact of buoyancy-induced convective flow. Flame balls were ...

    Computation of unsteady shock-induced combustion using logarithmic species conservation equations

    Wilson, Gregory J. / Sussman, Myles A. | NTRS | 1993
    usefulness of the ballistic-range experiments for the validation of numerical techniques and chemical kinetic models is also demonstrated. ...

    Evaluation of the Munich Method for modeling rocket engine performance

    Zeleznik, Frank J. | NTRS | 1993
    chemical equilibrium program. An examination of the Munich Method shows that it contains several flaws. If these defects are corrected then the ...

    Magnesium and Carbon Dioxide - A Rocket Propellant for Mars Missions

    Shafirovich, E. IA. / Shiriaev, A. A. / Goldshleger, U. I. | NTRS | 1993
    fuels ensure the most impulse but poor inflammability of Be and high toxicity of its compounds put obstacles to their applications. Analysis of ...

    Chemical-release mission of CRRES

    Reasoner, David L. | NTRS | 1992
    from the chemical-release experiments performed to date are (1) demonstration of critical velocity ionization over a narrow range of parameter ...

    Expert systems for automated maintenance of a Mars oxygen production system

    Huang, Jen-Kuang / Ho, Ming-Tsang / Ash, Robert L. | NTRS | 1992
    toward developing the methodology required to enable autonomous operation and control of these simple chemical processors at Mars. Failure ...

    Magnesium fluoride as energy storage medium for spacecraft solar thermal power systems

    Lurio, Charles A. | NTRS | 1992
    high heat of fusion per unit mass at a high melting point (1536 K). Theoretical evaluation showed the basic chemical compatibility of liquid ...

    Acetylene fuel from atmospheric CO2 on Mars

    Landis, Geoffrey A. / Linne, Diane L. | NTRS | 1992
    methane and oxygen by the exothermic reaction in an atmospheric processing module. Use of simple chemical reactions to produce acetylene/oxygen ...

    Viscous equilibrium computations using program LAURA

    Greene, Francis A. / Gupta, Roop N. | NTRS | 1992
    airflows under the assumption of thermal and chemical equilibrium. Equilibrium thermodynamic and transport property information are input to the ...

    CRRES plasma wave experiment

    Anderson, Roger R. / Gurnett, Donald A. / Odem, Daniel L. | NTRS | 1992
    interactions affecting the plasma and particle environment in the plasmasphere and magnetosphere as well as for studying the chemical releases. The ...

    The Composite Infrared Spectrometer

    Calcutt, Simon / Taylor, Fredric / Ade, Peter et al. | NTRS | 1992
    the possibility of discovery of previously undetected chemical species in these atmospheres. The long wavelengths accessible to CIRS allow ...

    Prediction of self-pressurization rate of cryogenic propellant tankage

    Hochstein, John I. / Ji, Hyun-Chul / Aydelott, John C. | NTRS | 1990
    chemical-propulsion orbit transfer vehicle. The computational predictions show that even small amounts of subcooling will significantly decrease ...