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  • ENERGY PRODUCTION AND CONVERSION  (2,381)
  • ASTROPHYSICS  (2,155)
  • AERODYNAMICS  (2,111)
  • 1975-1979  (6,645)
  • 1925-1929  (2)
Collection
Keywords
Years
Year
  • 1
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    Performance prediction evaluation of ceramic materials in point-focusing solar receivers (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A performance prediction was adapted to evaluate the use of ceramic materials in solar receivers for point focusing distributed applications. System requirements were determined including the receiver operating environment and system operating parameters for various engine types. Preliminary receiver designs were evolved from these system requirements. Specific receiver designs were then evaluated to determine material functional requirements.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158774 , JPL-PUB-79-58 , DOE/JPL-1060-23
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Radiative processes affecting the abundance of interstellar OH (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Photodissociation of OH dominates its destruction for a significant range of density and shielding in H I regions. Although inverse predissociation may provide an observable flux of ultraviolet recombination photons, it can provide only a small fraction of the total observed OH in most H I regions.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 207; Aug. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A new flow model for highly separated airfoil flows at low speeds (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An analytical model for separated airfoil flows is presented which is based on experimentally observed physical phenomena. These include a free stagnation point aft of the airfoil and a standing vortex in the separated region. A computer program is described which iteratively matches the outer potential flow, the airfoil turbulent boundary layer, the separated jet entrainment, mass conservation in the separated bubble, and the rear stagnation pressure. Separation location and pressure are not specified a priori. Results are presented for surface pressure coefficient and compared with experiment for three angles of attack for a GA(W)-1, 17% thick airfoil.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 367-382
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Unidentified lines in molecular clouds and a search for C-14 in IRC +10216 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two spectral features have been detected toward the Kleinmann-Low infrared nebula in Orion that agree in frequency with the 7(25)-7(16) and 7(35)-7(26) rotational transitions of the ring-structured molecule ethylene oxide (CH2)2O. A feature agreeing in frequency with the 8(24)-8(45) transition probably also was detected; however, seven other transitions in (CH2)2O were not. Additional unidentified lines were detected in Ori A and Sgr B2. Searches for H(C-14)N and (C-14)O in the luminous carbon star IRC +10216 were unsuccessful. However, an unidentified line was found in IRC +10216 that was not detected in the KL nebula.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 214
    Format: text
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  • 5
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    CO observations of mass outflow from the infrared star CIT 6 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are presented for observations of CO emission from the molecular envelope surrounding the carbon star CIT 6 (IRC + 30219) made at five epochs spanning 17 months. There is no evidence for any variation in the CO line intensity on this time scale, but the intensity is much lower than that reported by previous authors. In addition, an earlier report of (C-13)O line emission cannot be confirmed, and the carbon isotope ratio C-12/C-13 is measured to be greater than 20. The shape of the CO emission line observed at all epochs can be fitted by a uniformly expanding cloud model in which the CO is optically thin except through the longest lines of sight.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 233
    Format: text
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  • 6
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    Interstellar H2CO. I - Absorption studies, dark clouds, and the cosmic background radiation (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 196; Mar. 1
    Format: text
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  • 7
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    The transient X-ray source A0620-00 - Intensity variations and evidence for an 8 day periodicity (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The X-ray intensity of the transient source A0620-00 has been measured frequently with the SAS-3 X-ray Observatory from August 8, 1975 to February 13, 1976. This brightest of all known X-ray transients shows intensity variations on a time scale of days superposed on a general decline. Intensity data for the period from January 7 to February 13, 1976, show evidence of an approximate 7.8-day periodicity that may be the result of binary motion.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 210; Dec. 15
    Format: text
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  • 8
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    Development of low-cost silicon crystal growth techniques for terrestrial photovoltaic solar energy conversion (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Because of the growing need for new sources of electrical energy, photovoltaic solar energy conversion is being developed. Photovoltaic devices are now being produced mainly from silicon wafers obtained from the slicing and polishing of cylindrically shaped single crystal ingots. Inherently high-cost processes now being used must either be eliminated or modified to provide low-cost crystalline silicon. Basic to this pursuit is the development of new or modified methods of crystal growth and, if necessary, crystal cutting. If silicon could be grown in a form requiring no cutting, a significant cost saving would potentially be realized. Therefore, several techniques for growth in the form of ribbons or sheets are being explored. In addition, novel techniques for low-cost ingot growth and cutting are under investigation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Joint Conference on Sharing the sun: Solar technology in the seventies; Aug 15, 1976 - Aug 20, 1976; Winnipeg; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Growth, evaluation and modeling of silicon-on-ceramic solar cells (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The silicon-on-ceramic (SOC) process uses inexpensive ceramic substrates to provide supported growth of silicon from the melt. The conditions for unidirectional solidification, the grain structure and other properties are quite similar to those of EFG silicon ribbon. Solar cells with interdigital electrodes have demonstrated AMl conversion efficiencies (active area) of 7.8% without AR coatings and 10.1% efficiencies with an AR coating of SiO. Mathematical modeling of the series resistance of cells shows the feasibility of making electrical contact to the base layer of the cell through slots in the substrate. However, series resistance in the base layer sets an upper limit on slot spacing for efficient cell performance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; Jun 05, 1978 - Jun 08, 1978; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Hyperbolic cosmic dust - Its origin and its astrophysical significance (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The heliocentric radial distribution of the flux of hyperbolic cosmic dust particles, as measured by the Pioneer 8 and 9 spacecraft, is closely related to the radial variation of the spatial density of source or parent meteoroids. Within the limits of the experimental and theoretical uncertainties the spatial density of parent meteoroids, as deduced from the hyperbolic cosmic dust data, is found to be increasing with increasing heliocentric distance in the neighborhood of one AU. Other recent experimental evidence confirms this result. The new results also suggest that the ratio of the areal density of submicron-sized craters to the areal density of millimeter-sized craters will be less on the north-south faces of lunar rocks than on the east-west faces of the same rocks. The change in ratio is not as large as previously thought. It is noted that the solar system is not presently contributing significant amounts of dust to the interstellar medium though it may once have done so.
    Keywords: ASTROPHYSICS
    Type: Planetary and Space Science; 23; Oct. 197
    Format: text
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