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  • Inorganic Chemistry  (1.394)
  • EARTH RESOURCES AND REMOTE SENSING  (1.203)
  • AERODYNAMICS  (827)
  • 1995-1999
  • 1980-1984  (3.424)
  • 1910-1914
  • 1984  (1.682)
  • 1980  (1.742)
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  • 1995-1999
  • 1980-1984  (3.424)
  • 1910-1914
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  • 1
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    The influence of a high pressure gradient on unsteady velocity perturbations in the case of a turbulent supersonic flow (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The amplification or reduction of unsteady velocity perturbations under the influence of strong flow acceleration or deceleration was studied. Supersonic flows with large velocity, pressure gradients, and the conditions in which the velocity fluctuations depend on the action of the average gradients of pressure and velocity rather than turbulence, are described. Results are analyzed statistically and interpreted as a return to laminar process. It is shown that this return to laminar implies negative values in the turbulence production terms for kinetic energy. A simple geometrical representation of the Reynolds stress production is given.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75236 , AAF-NT-79-10 , Colloq. d''Aerodynamique Appl.; Nov 07, 1978 - Nov 09, 1978; Marseille; France|Jul 01, 1979
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    LAPR: An experimental aircraft pushbroom scanner (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: A three band Linear Array Pushbroom Radiometer (LAPR) was built and flown on an experimental basis by NASA at the Goddard Space Flight Center. The functional characteristics of the instrument and the methods used to preprocess the data, including radiometric correction, are described. The radiometric sensitivity of the instrument was tested and compared to that of the Thematic Mapper and the Multispectral Scanner. The radiometric correction procedure was evaluated quantitatively, using laboratory testing, and qualitatively, via visual examination of the LAPR test flight imagery. Although effective radiometric correction could not yet be demonstrated via laboratory testing, radiometric distortion did not preclude the visual interpretation or parallel piped classification of the test imagery.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-TM-80729
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    U.S., China agree on LANDSAT ground station (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-NEWS-RELEASE-80-14 , P80-10014
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    Unsteady effects of a control surface in two dimensional subsonic and transonic flow (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The experimental results of steady and unsteady pressure measurements, carried out in subsonic and transonic flow on a 16 percent relative thickness supercritical aerofoil, equipped with a trailing edge flap involving 25 percent of the chord, in a sinusoidal motion are given. These experimental results are compared with those obtained by various methods of steady and unsteady inviscid flow calculations. Some calculation results in which viscous effects have been taken into account, for both steady and unsteady flows, are also presented.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75775 , AGARD-CP-262
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 5
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    On the swelling of rolled up vortex surfaces and the breakdown of the vortex core for slender wings (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Simplified models of the vortex distribution over cylindrical surfaces are developed. The effect of a change of vortex strength was analyzed quantitatively by menas of potential theory. The considerable bulging of the cylindrical vortex sheet as a consequence of the change of the vortex strength is discussed. The coiling-up of the vortices rotation in opposite directions over the cylindrical surface renders the condition for instability and the subsequent large spreading of the vortex core. These processes occur without a positive pressure gradient being necessary in the field of flow surrounding the coiled up vortex sheet.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75862
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Investigations regarding the drag characteristics of flow-disturbing bodies which are arranged in line and attached to the wall (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The flow characteristics of rectangular bodies mounted on the base area of a rectangular closed wind tunnel are investigated. As many as four bodies are mounted in line with equal distances between successive bodies. The Mach number of the flowing air is in the range from 0.1 to 0.5. Total and individual drag values could be charged within a wide range by a suitable selection of the distance between successive bodies.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75788
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    NASA/HAA Advanced Rotorcraft Technology and Tilt Rotor Workshops. Volume 3: Aerodynamics and Structures Session (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Advanced rotorcraft technology and tilt rotor aircraft were discussed. Rotorcraft performance, acoustics, and vibrations were discussed, as was the use of composite materials in rotorcraft structures. Rotorcraft aerodynamics, specifically the aerodynamic phenomena of a rotating and the aerodynamics of fuselages, was discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-84147 , Dec 02, 1980 - Dec 05, 1980; Palo Alto, CA; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
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    Renewable resource applications of remote sensing in the 1980's (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: A number of renewable resource applications in the areas of agriculture, land, and water are summarized; and some of the current and future research efforts designed to enhance the utility of this tool are explored. Programs to incorporate microwave sensors with higher resolutions into the resource planning and management processes are also considered. Particular consideration is given to experience with LACIE and AgRISTARS; the current hydrologic land use, watershed physiography, and snow covered area applications of Landsat; and land cover mapping with MSS technology. Needed improvements are discussed with regard to goals of fundamental research, data acquisition requirements, and data handling and merging with other data sources.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: AAS PAPER 80-236 , Annual Meeting on Space Enhancing Technological Leadership; Oct 20, 1980 - Oct 23, 1980; Boston, MA; US
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 9
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    The aerodynamics of small Reynolds numbers (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Aerodynamic characteristics of wing model gliders and bird wings in particular are discussed. Wind tunnel measurements and aerodynamics of small Reynolds numbers are enumerated. Airfoil behavior in the critical transition from laminar to turbulent boundary layer, which is more important to bird wing models than to large airplanes, was observed. Experimental results are provided, and an artificial bird wing is described.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75816 , Jahrbuch 1953 der Wiss. Ges. fuer Luftfahrt E. V. mit den Vortraegen der WGL-Tagung in Goettingen; May 26, 1953 - May 29, 1953; Braunschweig; Germany
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 10
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    Study of the vortex conditions of wings with large sweepback by extrapolation of the Jones method (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The pockets of separation originating on the leading edges are surrounded by vortex sheets. Their configuration and intensity were determined by four conditions with the JONES approximation, which is itself corrected by a simple logic. Field pressures and stresses were computed for different cases and are compared with test results (pure deltas, swallow tails, truncations, strakes, ducks, fuselage).
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-75863 , Symp. of Appl. Aerodynamics; Nov 13, 1979 - Nov 15, 1979; Lille; France
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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