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    Sort results by: NASA Center | Date Added to NTRS | Publication Year
    There are a total of 1035531 record(s) matching your query.
    Sorted by: NASA Center in Ascending order

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    The high-speed aerodynamic effects of modifications to the wing and wing-fuselage intersection of an airplane model with the wing swept back 35 degrees

    Author(s): Boddy, Lee E; Morrill, Charles P , Jr
    Abstract: No Abstract Available
    NASA Center: Ames Research Center
    Publication Year: 1948
    Added to NTRS: 2006-11-06
    Accession Number: 93R15105; Document ID: 19930085815; Report Number: NACA-RM-A7J02

    Mars rover sample return: An exobiology science scenario

    Author(s): Rosenthal, D. A.; Sims, M. H.; Schwartz, Deborah E.; Nedell, S. S.; Mckay, Christopher P.; Mancinelli, Rocco L.
    Abstract: A mission designed to collect and return samples from Mars will provide information regarding its composition, history, and evolution. At the same time, a sample return mission generates a technical challenge. Sophisticated, ...
    NASA Center: Ames Research Center
    Publication Year: 1988
    Added to NTRS: 2008-05-30
    Accession Number: 89N18350; Document ID: 19890008979

    Exact-Output Tracking Theory for Systems with Parameter Jumps

    Author(s): Devasia, Santosh; Paden, Brad; Rossi, Carlo
    Abstract: In this paper we consider the exact output tracking problem for systems with parameter jumps. Necessary and sufficient conditions are derived for the elimination of switching-introduced output transient. Previous works have ...
    NASA Center: Ames Research Center
    Publication Year: 1996
    Added to NTRS: 2004-11-03
    Accession Number: 97N12187; Document ID: 19970003455

    Electro-mechanical Properties of Carbon Nanotubes: Effect of Small Tensile and Torsional Strains

    Author(s): Anantram, M. P.; Yang, Liu; Han, Jie; Liu, J. P.
    Abstract: We present a simple picture to calculate the bandgap (E_g) of carbon nanotubes (CNT) in the presence of uniform torsional and tensile strain (\sigma). We find that under tensile strain, absolute value of dE_g/d\sigma of ...
    NASA Center: Ames Research Center
    Publication Year: 1999
    Added to NTRS: 2004-11-03
    Document ID: 20020070285

    Precision attitude control for tethered satellites

    Author(s): Kline-Schoder, Robert J.; Powell, J. D.
    Abstract: Tethered spacecraft are particularly well suited to serve as isolation platforms for space-borne observatories. It has previously been shown that, due to the relatively large tether force, conventional means of performing ...
    NASA Center: Ames Research Center
    Publication Year: 1993
    Added to NTRS: 2004-11-03
    Accession Number: 93A23522; Document ID: 19930039525

    Merged Vision and GPS Control of a Semi-Autonomous, Small Helicopter

    Author(s): Rock, Stephen M.
    Abstract: This final report documents the activities performed during the research period from April 1, 1996 to September 30, 1997. It contains three papers: Carrier Phase GPS and Computer Vision for Control of an Autonomous ...
    NASA Center: Ames Research Center
    Publication Year: 1999
    Added to NTRS: 2008-06-02
    Document ID: 19990042372

    Case-Based Capture and Reuse of Aerospace Design Rationale

    Author(s): Leake, David B.
    Abstract: The goal of this project was to apply artificial intelligence techniques to facilitate capture and reuse of aerospace design rationale. The project combined case-based reasoning (CBR) and concept maps (CMaps) to develop ...
    NASA Center: Ames Research Center
    Publication Year: 2001
    Added to NTRS: 2008-06-02
    Document ID: 20020010897

    A Bayesian classification of the IRAS LRS Atlas

    Author(s): Goebel, J.; Stutz, J.; Volk, K.; Walker, H.; Gerbault, F.; Self, M.; Taylor, W.; Cheeseman, P.
    Abstract: The availability of a reclassification of the IRAS LRS Atlas of spectra using a new Bayesian classification procedure (AutoClass) is announced. The classes of objects which result from the application of the AutoClass ...
    NASA Center: Ames Research Center
    Publication Year: 1989
    Added to NTRS: 2004-11-03
    Accession Number: 90A12952; Document ID: 19900025897

    Numerical solution of the incompressible Navier-Stokes equations in three-dimensional generalized curvilinear coordinates

    Author(s): Rogers, S. E.; Kwak, D.; Chang, J. L. C.
    Abstract: Numerically solving the incompressible Navier-Stokes equations is known to be time consuming and expensive. Testing of the INS3D computers code, which solves these equations with the use of the pseudocompressibility method, ...
    NASA Center: Ames Research Center
    Publication Year: 1986
    Added to NTRS: 2005-08-25
    Accession Number: 87N11964; Document ID: 19870002531; Report Number: A-85413, NAS 1.15:86840, NASA-TM-86840

    An overview of Ames experimental aerothermodynamics

    Author(s): Park, C.
    Abstract: This paper reviews the recent experimental research activities on aerothermodynamics within NASA Ames Research Center. The activities included in this review are those in (1) the electric arc-driven shock tubes, (2) the ...
    NASA Center: Ames Research Center
    Publication Year: 1992
    Added to NTRS: 2004-11-03
    Accession Number: 93A45496; Document ID: 19930061499

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