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  • ENERGY PRODUCTION AND CONVERSION  (63)
  • ASTRONOMY  (47)
  • 2015-2019
  • 1975-1979  (110)
  • 1950-1954
  • 1930-1934
  • 1925-1929
  • 1976  (110)
  • 1
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    Dip coating process: Silicon sheet growth development for the large-area silicon sheet task of the low-cost silicon solar array project (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The technical and economic feasibility of producing solar cell quality sheet silicon by dip-coating one surface of carbonized ceramic substrates with a thin layer of large grain polycrystalline silicon was investigated. The dip-coating methods studied were directed toward a minimum cost process with the ultimate objective of producing solar cells with a conversion efficiency of 10% or greater. The technique shows excellent promise for low cost, labor-saving, scale-up potentialities and would provide an end product of sheet silicon with a rigid and strong supportive backing. An experimental dip-coating facility was designed and constructed, several substrates were successfully dip-coated with areas as large as 25 sq cm and thicknesses of 12 micron to 250 micron. There appears to be no serious limitation on the area of a substrate that could be coated. Of the various substrate materials dip-coated, mullite appears to best satisfy the requirement of the program. An inexpensive process was developed for producing mullite in the desired geometry.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-149242 , ERDA/JPL-954356-76/2 , AR-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Optical observation of WRA 977 (3U 1233-62?) (1976)
    In:  CASI
    Details
    Publication Date: 2006-04-18
    Description: UBV photometry of WRA 977 on 36 nights between January and July of 1974 shows that this object is active on a time scale of days at the 0.1 mag level, but that it remains quite constant during monitoring intervals lasting up to 1 hour. Periodogram analysis reveals no significant periodic variation in the brightness of this object.
    Keywords: ASTRONOMY
    Type: NASA. Goddard Space Flight Center X-ray Binaries; p 677-682
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A study of meteor spectroscopy and physics from earth-orbit: A preliminary survey into ultraviolet meteor spectra (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Preliminary data required to extrapolate available meteor physics information (obtained in the photographic, visual and near ultraviolet spectral regions) into the middle and far ultraviolet are presented. Wavelength tables, telluric attenuation factors, meteor rates, and telluric airglow data are summarized in the context of near-earth observation vehicle parameters using moderate to low spectral resolution instrumentation. Considerable attenuation is given to the problem of meteor excitation temperatures since these are required to predict the strength of UV features. Relative line intensities are computed for an assumed chondritic composition. Features of greatest predicted intensities, the major problems in meteor physics, detectability of UV meteor events, complications of spacecraft motion, and UV instrumentation options are summarized.
    Keywords: ASTRONOMY
    Type: NASA-CR-2664
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    An Atlas of extraterrestrial particles collected with NASA U-2 aircraft, 1974 - 1976 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Extraterrestrial particles collected during U-2 flights in the stratosphere were divided into four groups: chondritic, iron-sulfur--nickel, mafic silicates, and others. The chondritic aggregates are typically composed of Fe, Mg, Si, C, S, Ca, and Ni. Detectable levels of He-4 implanted from the solar wind occur in some. Olivine, spinel, and possibly pyrrhotite and a hydrated layered-lattice silicate were identified. The chondritic ablation particles contain no sulfur and appear to have been melted. Magnetite, olivine, and pyroxene were identified. The iron-sulfur-nickel type particles resemble meteoritic iron sulfide with a small amount of nickel, and contain magnetite and troilite. The mafic silicate type particles are iron magnesium silicate grains with clumps of chondritic aggregate particles adhering to their surfaces. Olivine and possibly pyrrhotite and pyroxene were identified. Most of the iron-nickel type particles are spherules and include taenite and wustite. The other type particles include nickel-iron mounds on spheroidal glassy-like grains having chondritic-like elemental abundances.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-73152 , A-6672
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    NASA TECHNICAL REPORTS
  • 5
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    The ultraviolet variations of Iota Cassiopeiae (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 209; Oct. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Interplanetary scintillation observations with the Cocoa Cross radio telescope (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Physical and electrical parameters for the 34.3-MHz Cocoa Cross radio telescope are given. The telescope is dedicated to the determination of solar-wind characteristics in and out of the ecliptic plane through measurement of electron-density irregularity structure as determined from IPS (interplanetary scintillation) of natural radio sources. The collecting area (72,000 sq m), angular resolution (0.4 deg EW by 0.6 deg NS), and spatial extent (1.3 km EW by 0.8 km NS) make the telescope well suited for measurements of IPS index and frequency scale for hundreds of weak radio sources without serious confusion effects.
    Keywords: ASTRONOMY
    Type: Journal of Geophysical Research; 81; Feb. 1
    Format: text
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  • 7
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    MX 1313+29 - A compact source of very low energy X-rays in Coma Berenices (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A compact X-ray source near the North Galactic Pole has been detected with the low-energy X-ray telescope aboard the SAS-3 satellite. The spectral temperature of the source is less than 1 million K, and the energy flux at the earth is 3 by 10 to the -10th power erg/sq cm/sec above 0.1 keV. The flux appeared to be constant both on short time scales (10-1000 s), and over the interval from the first SAS-3 observation (June 12, 1975) to the latest (July 15, 1975). The possible identification of this source with the hot white dwarf HZ 43 is discussed.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 203; Jan. 1
    Format: text
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  • 8
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    Experiments to evaluate high-temperature rolling as a low-cost process for silicon solar cells (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mechanical rolling (a process used in industry for producing large quantities of metallic sheet and strip) has been suggested for the rapid low-cost manufacture of silicon sheet to be used for photovoltaic power generation equipment, such as solar arrays. The advantages of rolling include: high rates of production, wide sheets as products, good control of dimension, and (in the case of solar grade silicon) minimal development of impurities. Experiments have been performed using high-temperature, high-speed compression of polycrystalline silicon cylinders. Metallography and X-ray diffraction techniques have been used to examine the samples both before and after compression, and a model process has been designed to evaluate the technical practicality and economic feasibility of the method.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; Nov 15, 1976 - Nov 18, 1976; Baton Rouge, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The ultraviolet variations of iota Cas (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Ap variable star iota Cas was observed with the photometers on OAO-2 covering the spectral range 1430-4250 A. The ultraviolet light curves show a double wave with primary minimum and maximum at phase ? 0.00 and 0.35, respectively. Secondary minimum light is at phase ? 0.65 with secondary maximum at phase ? 0.85. The light curves longward of 3150 A vary in opposition to those shortward of this 'null region'. Ground-based coude spectra show that the Fe II and Cr II line strengths have a double-wave variation such that maximum strength occurs at minimum ultraviolet light. We suggest that the strong ultraviolet opacities due to photoionization and line blanketing by these metals may cause the observed photometric variations. We have also constructed an oblique-rotator model which shows iron and chromium lying in a great circle band rather than in circular spots.
    Keywords: ASTRONOMY
    Type: Colloquium on Physics of Ap-stars; Sep 08, 1975 - Sep 11, 1975; Vienna; Austria
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    NASA TECHNICAL REPORTS
  • 10
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    Large area silicon sheet by EFG (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Progress in a program to produce high speed, thin, wide silicon sheets for fabricating 10% efficient solar cells is reported. An EFG ribbon growth system was used to perform growth rate and ribbon thickness experiments. A new, wide ribbon growth system was developed. A theoretical study of stresses in ribbons was also conducted. The EFG ribbons were observed to exhibit a characteristic defect structure which is orientation dependent in the early stages of growth.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: C-500 , ERDA/JPL-954355-76/11 , NASA-CR-149236
    Format: application/pdf
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