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  • 1
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    A method of weighted residuals for the investigation of sound transmission in non-uniform ducts without flow (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: ACOUSTICS
    Type: Journal of Sound and Vibration; 38; Jan. 8
    Format: text
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  • 2
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    Analysis of the Learjet 35/36 Wing and Correlation with Experimental Results (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Two NASTRAN models of the Gates Learjet Corporation Model 35/36 Wing were developed. The models and the problems encountered in their development are discussed. A skin buckling analysis used for the ultimate loading conditions is presented. A discussion of the static tests and the correlation of the static test with the NASTRAN results and the results of a supplementary semimonocoque beam analysis are also included.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Ames Res. Center NASTRAN: User's Experiences; p 331-352
    Format: application/pdf
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  • 3
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    Wind-tunnel investigation of the OMAC canard configuration (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Wind-tunnel tests were conducted on a 0.175-scale model of the OMAC Laser 300 canard configuration in the NASA Langley 12-Foot Low-Speed Wind Tunnel to determine its low-speed high angel-of-attack aerodynamic characteristics. The Laser 300 is a general aviation turboprop pusher aircraft utilizing a canard configuration. The design incorporates a low forward wing and a high main wing with a leading-edge droop installed on the outboard panel and tip fins mounted on the wing tips. The model was tested over a range of -6 to 50-deg angle-of-attack and 20 to -20 deg sideslip. Static force and moment data were measured, and the longitudinal and lateral-directional characteristics were determined.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-2608
    Format: text
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  • 4
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    Interpreting forest and grassland biome productivity utilizing nested scales of image resolution and biogeographical analysis (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Several hardware, software, and data collection problems encountered were conquered. The Geographic Information System (GIS) data from other systems were converted to ERDAS format for incorporation with the image data. Statistical analysis of the relationship between spectral values and productivity is being pursued. Several project sites, including Jackson, Pope, Boulder, Smokies, and Huntington Forest are evolving as the most intensively studied areas, primarily due to availability of data and time. Progress with data acquisition and quality checking, more details on experimental sites, and brief summarizations of research results and future plans are discussed. Material on personnel, collaborators, facilities, site background, and meetings and publications of the investigators are included.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-179739 , NAS 1.26:179739 , PR-2
    Format: application/pdf
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  • 5
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    Interpreting forest and grassland biome productivity utilizing nested scales of image resolution and biogeographical analysis (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Data acquisition, initial site characterization, image and geographic information methods available, and brief evaluations of first-year for NASA's Thematic Mapper (TM) working group are presented. The TM and other spectral data are examined in order to relate local, intensive ecosystem research findings to estimates of carbon cycling rates over wide geographic regions. The effort is to span environments ranging from dry to moist climates and from good to poor site quality using the TM capability, with and without the inclusion of geographic information system (GIS) data, and thus to interpret the local spatial pattern of factors conditioning biomass or productivity. Twenty-eight TM data sets were acquired, archived, and evaluated. The ERDAS image processing and GIS system were installed on the microcomputer (PC-AT) and its capabilities are being investigated. The TM coverage of seven study areas were exported via ELAS software on the Prime to the ERDAS system. Statistical analysis procedures to be used on the spectral data are being identified.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-176803 , NAS 1.26:176803
    Format: application/pdf
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  • 6
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    An exploratory investigation of weight estimation techniques for hypersonic flight vehicles (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The three basic methods of weight prediction (fixed-fraction, statistical correlation, and point stress analysis) and some of the computer programs that have been developed to implement them are discussed. A modified version of the WAATS (Weights Analysis of Advanced Transportation Systems) program is presented, along with input data forms and an example problem.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-164420
    Format: application/pdf
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  • 7
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    Kinetics of oxide film growth on metal crystals - Thermal electron emission and ionic diffusion. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Thermal oxidation kinetics of oxide film growth on metal crystals, considering ion diffusion and thermionic electron emission
    Keywords: PHYSICS, SOLID-STATE
    Format: text
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  • 8
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    Kinetics of oxide film growth on metal crystals - Electron tunneling and ionic diffusion. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Growth rate of oxide and other dielectric contact films on metal crystals computed for ionic diffusion and electron tunneling
    Keywords: PHYSICS, SOLID-STATE
    Type: PHYSICAL REVIEW
    Format: text
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  • 9
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    A technique for extrapolating and validating forest cover across large regions - Calibrating AVHRR data with TM data (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A method is presented for extending high-resolution forest cover information across large regions. Using Landsat TM data with AVHRR data, an empirical relationship beween AVHRR spectral signatures and forest cover is developed. The resulting regression equation is applied to an AVHRR scene covering a large area centered around southern Illinois. The map is used to estimate forest cover within a geographical information system. The results are compared with U.S. Forest Service estimates, showing good agreement.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Journal of Remote Sensing (ISSN 0143-1161); 10; 1805-181
    Format: text
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  • 10
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    The NASA Inductrack Model Rocket Launcher at the Lawrence Livermore National Laboratory (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The Inductrack magnetic levitation system, developed at the Lawrence Livermore National Laboratory, is being studied for its possible use for launching rockets. Under NASA sponsorship, a small model system is being constructed at the Laboratory to pursue key technical aspects of this proposed application. The Inductrack is a passive magnetic levitation system employing special arrays of high-field permanent magnets (Halbach arrays) on the levitating carrier, moving above a "track" consisting of a close-packed array of shorted coils with which are interleaved with special drive coils. Halbach arrays produce a strong spatially periodic magnetic field on the front surface of the arrays, while canceling the field on their back surface. Relative motion between the Halbach arrays and the track coils induces currents in those coils. These currents levitate the carrier cart by interacting with the horizontal component of the magnetic field. Pulsed currents in the drive coils, synchronized with the motion of the carrier, interact with the vertical component of the magnetic field to provide acceleration forces. Motional stability, including resistance to both vertical and lateral aerodynamic forces, is provided by having Halbach arrays that interact with both the upper and the lower sides of the track coils. In its completed form the model system that is under construction will have a track approximately 100 meters in length along which the carrier cart will be propelled up to peak speeds of Mach 0.4 to 0.5 before being decelerated. Preliminary studies of the parameters of a full-scale system have also been made. These studies address the problems of scale-up, including means to simplify the track construction and to reduce the cost of the pulsed-power systems needed for propulsion.
    Keywords: Launch Vehicles and Launch Operations
    Type: Fifth International Symposium on Magnetic Suspension Technology; 93-101; NASA/CP-2000-210291
    Format: text
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