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  • Organic Chemistry  (3,423)
  • AIRCRAFT PROPULSION AND POWER  (1,211)
  • SOLAR PHYSICS  (1,193)
  • 1975-1979  (5,827)
Collection
Keywords
Publisher
Years
Year
  • 11
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    Approximate dynamic model of a turbojet engine (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An approximate dynamic nonlinear model of a turbojet engine is elaborated on as a tool in studying the aircraft control loop, with the turbojet engine treated as an actuating component. Approximate relationships linking the basic engine parameters and shaft speed are derived to simplify the problem, and to aid in constructing an approximate nonlinear dynamic model of turbojet engine performance useful for predicting aircraft motion.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-75263
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 12
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    Summary of NASA aerodynamic and heat transfer studies in turbine vanes and blades (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Aerodynamic effects of trailing edge geometry, hole size, angle, spacing, and shape have been studied in two- and three-dimensional cascades and in a warm turbine test series. Heat transfer studies have been carried out in various two- and three-dimensional test facilities in order to provide corresponding heat transfer data. Results are shown in terms of cooling effectiveness and aerodynamic efficiency for various coolant fractions, coolant-primary temperature ratios, and cooling configurations.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: SAE PAPER 760917
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    Solar and magnetospheric science (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The current status of the Solar Physics Program and the Magnetospheric Physics Program is discussed. The scientific context for each of the programs is presented, then the current programs and future plans are outlined.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-X-3440
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    ATM observations - X-ray results (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Preliminary results of the solar X-ray observations from Skylab are reviewed which indicate a highly structured nature for the corona, with closed magnetic-loop structures over a wide range of size scales. A description of the S-054 experiments is provided, and values are given for the parameters - including size, density, and temperature - describing a variety of typical coronal features. The structure and evolution of active regions, coronal holes, and bright points are discussed.
    Keywords: SOLAR PHYSICS
    Type: Astrophysics and Space Science; 39; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 15
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    A comparison of coronal X-ray structures of active regions with magnetic fields computed from photospheric observations (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The appearances of several X-ray active regions observed on March 7, 1970 and June 15, 1973 are compared with the corresponding coronal magnetic-field topology. Coronal fields have been computed from measurements of the longitudinal component of the underlying magnetic fields, based on the current-free hypothesis. An overall correspondence between X-ray structures and calculated field lines is established, and the magnetic counterparts of different X-ray features are also examined. A correspondence between enhanced X-ray emission and the location of compact closed field lines is suggested. Representative magnetic-field values calculated under the assumption of current-free fields are given for heights up to 200 sec.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 44; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 16
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    The mechanism of temperature and pressure changes in the Earth's atmosphere during solar flares (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The effect of solar flares on the weather on Earth is examined. It is concluded that the processes which arise in the atmosphere are so intricate that a single calculation of solar activity is insufficient for long-range forecasting. However, combined consideration of processes dependent upon the dynamic instability of the atmosphere and the effect of solar activity will contribute to the improvement of long-range forecasts.
    Keywords: SOLAR PHYSICS
    Type: NASA-TM-75349 , All-Union Conf. on Sun Atmosphere Relations in Climate Theory and Weather Forecasts; Oct 30, 1972 - Nov 01, 1972; Moscow
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 17
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    Test engines promise less noise from small aircraft (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-NEWS-RELEASE-79-24 , P79-10025
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 18
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    Experimental turbofan engine for small aircraft delivered (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-NEWS-RELEASE-79-137 , P79-10137
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 19
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    Extreme ultraviolet observations of coronal holes. II - Association of holes with solar magnetic fields and a model for their formation during the solar cycle (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Skylab and ground-based observations in the extreme UV range of the spectrum are used to analyze characteristics of coronal holes, and to correlate their development with variations in the solar cycle. The mergence of bipolar magnetic regions (BMR) during the declining phase of the cycle is held reponsible for the formation of large equatorial holes (M-regions, which cause recurring geomagnetic storms). The BMR mergence model can also be applied to polar cap holes.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 56; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 20
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    New materials for high temperature turbines; ONERA's DS composites confronted with blade problems (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: ONERA's refractory DS composites were cited as materials required for use in advanced aircraft turbines, operating at high temperatures. These materials were found to be reliable in the construction of turbine blades. Requirements for a blade material in aircraft turbines operating at higher temperatures were compared with the actual performance as found in COTAC DS composite testing. The structure and properties of the more fully developed 74 and 741 types were specified. High temperature structural stability, impact of thermal and mechanical fatigue, oxidation resistance and coating capability were thoroughly evaluated. The problem of cooling passages in DS eutectic blades is also outlined.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-75216 , High Temp. Probl. in Gas Turbine Eng.; 19-23 Sept. 1977; Ankara
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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