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  • GEOPHYSICS  (109)
  • ASTROPHYSICS  (74)
  • STRUCTURAL MECHANICS  (41)
  • COMMUNICATIONS
  • 1975-1979  (224)
  • 1970-1974
  • 1960-1964
  • 1978  (224)
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  • 1975-1979  (224)
  • 1970-1974
  • 1960-1964
Year
  • 1
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    High heat flux actively cooled honeycomb sandwich structural panel for a hypersonic aircraft (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of a program to design and fabricate an unshielded actively cooled structural panel for a hypersonic aircraft are presented. The design is an all-aluminum honeycomb sandwich with embedded cooling passages soldered to the inside of the outer moldline skin. The overall finding is that an actively cooled structure appears feasible for application on a hypersonic aircraft, but the fabrication process is complex and some material and manufacturing technology developments are required. Results from the program are summarized and supporting details are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2959
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Plasma flow pulsations in earth's magnetic tail (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: On November 9, 1972 Imp 7 was in the plasma sheet from 0430 to 1000 UT and detected strong earthward plasma flows. A series of nine temporal pulsations were observed to vary in bulk speed from 0 to about 1500 km/s and to occur at 15-30 minute intervals. A positive correlation exists between the speed variations and changes in the standard deviation of the magnetic field. Evident periodicity was not found corresponding to Imp 7 pulsations and other magnetospheric or solar wind data. It is felt that the pulsations may indicate that tail reconnection is unsteady in periods of 10-30 minutes.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Tests of beaded and tubular structural panels (1978)
    In:  CASI
    Details
    Publication Date: 2006-06-12
    Description: Two efficient concepts built from curved elements were identified, and a data base for tubular panels was developed. The tubular panel failure modes were understood, and the data base for these panels indicated that their performance can be predicted. The concepts are currently being tested in a realistic builtup structure; 157 room temperature tests and 67 hot tests were made with no structural failures, although all of these tests were not at the design load of the structure.
    Keywords: STRUCTURAL MECHANICS
    Type: Recent Advan. in Structures for Hypersonic Flight, Pt. 2; p 538-576
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Earth Radiation Budget (ERB) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The radiation budget of the earth on both synoptic and planetary scales by simultaneous measurement of incoming solar radiation and outgoing earth reflected (shortwave) and emitted (longwave) radiation was determined. Both fixed wide angle sampling of terrestrial fluxes at the satellite altitude, and scanned narrow-angle sampling of the radiance components, dependent on angle are used to determine outgoing radiation. Measurements of radiation are obtained in 22 different optical channels.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 33-58
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Stratospheric Aerosol Measurement (SAM 2) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The Stratospheric Aerosol Measurement 2 (SAM 2) is used to map the concentration and optical properties of stratospheric aerosols as a function of altitude, latitude, and longitude. The vertical distribution of the stratospheric aerosols in the polar regions of both hemispheres is provided.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 105-138
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Electrical structure and ionizable constituent measurements (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: In-situ stratospheric ions showed typical characteristics. A Krypton lamp created large numbers of additional ions of remarkably high mobility with a product of number density and ionization cross section of the ionizable constituent(s) greater than 10 cm to the 9th power per cm.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center STRATCOM 8 Data Workshop and Suppl.; p 103-108
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Electrical conductivity measurements from the STRATCOM 8 experiment (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A blunt probe experiment for measuring electrical conductivity was flown with the STRATCOM 8 instrument package. Data were obtained by the instrument throughout the entire measurement period. A preliminary analysis of the data indicates an enhancement in conductivity associated with the krypton discharge ionization lamp, particularly in negative conductivity. The conductivity values and their altitude dependence are consistent with previous balloon and rocket results.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center STRATCOM 8 Data Workshop and Suppl.; p 96-102
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Hypersonic structures: An aerodynamicist's perspective, or one man's dream is another man's nightmare (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The relationship between hypersonic aerodynamic and structural design is reviewed. The evolution of the hypersonic vehicle design is presented. Propulsion systems, structural materials, and fuels are emphasized.
    Keywords: STRUCTURAL MECHANICS
    Type: Recent Advan. in Structures for Hypersonic Flight, Pt. 1; p 5-38
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Interplanetary propagation of flare-associated energetic particles (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A propagation model which combines a Gaussian profile for particle release from the sun, with interplanetary particle densities predicted by focused diffusion, was proposed to explain the propagation history of flare associated energetic particles. This model, which depends on only two parameters, successfully describes the time-intensity profiles of 30 proton and electron events originating from the western hemisphere of the sun. Generally, particles are released from the sun over a finite interval. In almost all events, particle release begins at the time of flare acceleration.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-79534
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Design and fabrication of a radiative actively cooled honeycomb sandwich structural panel for a hypersonic aircraft (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The panel assembly consisted of an external thermal protection system (metallic heat shields and insulation blankets) and an aluminum honeycomb structure. The structure was cooled to temperature 442K (300 F) by circulating a 60/40 mass solution of ethylene glycol and water through dee shaped coolant tubes nested in the honeycomb and adhesively bonded to the outer skin. Rene'41 heat shields were designed to sustain 5000 cycles of a uniform pressure of + or - 6.89kPa (+ or - 1.0 psi) and aerodynamic heating conditions equivalent to 136 kW sq m (12 Btu sq ft sec) to a 422K (300 F) surface temperature. High temperature flexible insulation blankets were encased in stainless steel foil to protect them from moisture and other potential contaminates. The aluminum actively cooled honeycomb sandwich structural panel was designed to sustain 5000 cycles of cyclic in-plane loading of + or - 210 kN/m (+ or - 1200 lbf/in.) combined with a uniform panel pressure of + or - 6.89 kPa (?1.0 psi).
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2957
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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