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  • GEOPHYSICS  (6)
  • ENERGY PRODUCTION AND CONVERSION  (5)
  • Anabaena  (1)
  • Geophysics
  • 1975-1979  (12)
  • 1977  (8)
  • 1976  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The cell content and secretion of water-soluble vitamins by several freshwater algae (1977)
    Springer
    Archives of microbiology 112 (1977), S. 57-59 
    Details
    ISSN: 1432-072X
    Keywords: Water soluble vitamins (secretion, cell content) ; Chlamydomonas ; Chlorella ; Scenedesmus ; Anabaena
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three green algae, Chlamydomonas reinhardii, Chlorella vulgaris and Scenedesmus obliquus, and one blue-green alga, Anabaena cyclindrica, were grown in chemically defined media. All the algac examined contained folates, β-carotene and vitamins C and E; several of the B-vitamins and vitamin A were found in varying amounts in some but not in all the algae examined. All the green algae secreted significant amounts of folate and biotin and all but Scenedesmus secreted pantothenate into their growth medium; Anabaena secreted folate and pantothenate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446654
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Study of the potential for improving the economics of hydrogen liquefaction through the use of centrifugal compressors and the addition of a heavy water plant (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An approach to the liquefaction of hydrogen was developed which permits the application of standard centrifugal compressors in place of reciprocating machines. A second fluid, such as propane, is added to the hydrogen prior to compression to form a mixture having a molecular weight much greater than that of hydrogen alone, so that a standard centrifugal compressor can be used. After compression, the mixture is cooled to cryogenic temperature levels where the propane condenses out of the mixture and is separated as a liquid. Since a small amount of deuterium is produced during hydrogen liquefaction, the potential of recovering deuterium and selling it as a co-product was investigated. Deuterium, in the form of heavy water, can be used in certain nuclear reactors as a neutron moderator to reduce the neutron velocity and enhance the probability of neutron collision with uranium nucleii.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-145282
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The relationship of energy flow at the magnetopause to geomagnetic activity (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Properties of the energetic electron (E greater than or approximately equal to 200 keV) magnetopause layer along the distant magnetotail have been studied with Caltech instrumentation aboard IMP-8 for approximately 60 spacecraft orbits. The cross-sectional area of the layer appears to increase by a factor of approximately 5 with increasing geomagnetic activity, and the average unidirectional electron flux within the layer increases by a factor of approximately 4. The energy carried by electrons greater than or approximately equal to 200 keV ranges from approximately 10 to the 14th ergs per second to approximately 10 to the 15th ergs per second. Extrapolation to include all electrons greater than 1 keV suggests total energy flow ranging from approximately 3 x 10 to the 15th ergs per second at quiet times to approximately 5 x 10 to the 18th ergs per second at magnetically disturbed times.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 4; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Energetic electron anisotropies in the magnetotail - Identification of open and closed field lines (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Unidirectional anisotropies in the energetic electron fluxes (E greater than or equal to about 200 keV) have been observed in the earth's magnetotail with the Caltech Electron/Isotope Spectrometer on IMP-8. The anisotropies occur during periods of enhanced fluxes and provide essential information on the topology (open or closed) of the magnetotail field lines which are associated with recently identified acceleration regions.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 3; Sept
    Format: text
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  • 5
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    Measurement of the nitric oxide altitude distribution in the mid-latitude mesosphere (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A simple rocket-borne system has been developed for deriving nitric oxide concentration in the mesosphere from measurements of resonantly scattered solar ultraviolet radiation in the NO gamma band near 2150 A. The NO signal is extracted from a background of Rayleigh-scattered light by a direct measurement of this scattered light by use of an NO absorption cell. This system was utilized to measure the NO concentration above White Sands, New Mexico, in the altitude range from 69 to 101 km. The derived NO profile shows a concentration of about 30 million per cu cm at 67 and 100 km with a deep valley (more than an order of magnitude less) at about 84 km. Comparison with model calculations indicates that the time constant for NO chemistry is smaller than or comparable with that for transport.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Aug. 1
    Format: text
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  • 6
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    Status of the DOE /STOR/-sponsored national program on hydrogen production from water via thermochemical cycles (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A pure thermochemical cycle is a system of linked regenerative chemical reactions which accepts only water and heat and produces hydrogen. Thermochemical cycles are potentially a more efficient and cheaper means of producing hydrogen from water than is the generation of electricity followed by electrolysis. The Energy Storage Systems Division of the Department of Energy is currently funding a national program on thermochemical hydrogen production. The National Aeronautics and Space Administration is responsible for the technical management of this program. The goal is to develop a cycle which can potentially operate with an efficiency greater than 40% using a heat source providing a maximum available temperature of 1150 K. A closed bench-scale demonstration of such a cycle would follow. This cycle would be labeled a 'reference cycle' and would serve as a baseline against which future cycles would be compared.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Miami International Conference on Alternative Energy Sources; Dec 05, 1977 - Dec 07, 1977; Miami Beach, FL; US
    Format: text
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  • 7
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    Status of the DOE (STOR)-sponsored national program on hydrogen production from water via thermochemical cycles (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The program structure is presented. The activities of the thermochemical cycles program are grouped according to the following categories: (1) specific cycle development, (2) support research and technology, (3) cycle evaluation. Specific objectives and status of on-going activities are discussed. Chemical reaction series for the production of hydrogen are presented. Efficiency and economic evaluations are also discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-78825 , E-9529 , Miami Intern. Conf. on Alternative Energy Sources; Dec 05, 1977 - Dec 07, 1977; Miami Beach, FL; United States
    Format: application/pdf
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  • 8
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    A study of the efficiency of hydrogen liquefaction (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The search for an environmentally acceptable fuel to eventually replace petroleum-based fuels for long-range jet aircraft has singled out liquid hydrogen as an outstanding candidate. Hydrogen liquefaction is discussed, along with the effect of several operating parameters on process efficiency. A feasible large-scale commercial hydrogen liquefaction facility based on the results of the efficiency study is described. Potential future improvements in hydrogen liquefaction are noted.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: World Hydrogen Energy Conference; Mar 01, 1976 - Mar 03, 1976; Miami Beach, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The magnetopause electron layer along the distant magnetotail (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An energetic electron layer is found immediately adjacent to, and outside of, the magnetopause surface along the distant magnetotail. The layer has been detected by instrumentation aboard the earth-orbiting spacecraft IMP-8 and is observed for electrons with energies above about 200 keV. The present study shows that such electrons form a layer about 3 earth radii thick and are strongly streaming in a well-ordered pattern, especially along the dusk magnetopause. The energy dissipation implied by the persistent flow may be a direct indication of nearly continuous magnetic merging at or near the magnetopause.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 4; Apr. 197
    Format: text
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  • 10
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    Vibrationally-excited hydroxyl molecules in the lower atmosphere (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The vibrational energy distributions of hydroxyl molecules in the lower atmosphere were calculated. As expected, the distributions are found to be highly nonequilibrated. Attention is drawn to the role that vibrationally-excited molecules may play in modifying the chemistry of the lower atmosphere. The most likely role for the OH molecule in the stratosphere is via reactions that may not otherwise be energetically viable.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 3; Dec. 197
    Format: text
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