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  • GEOPHYSICS  (6)
  • FLUID MECHANICS AND HEAT TRANSFER  (4)
  • Anabaena  (1)
  • Geophysics
  • 1975-1979  (11)
  • 1977  (6)
  • 1976  (5)
  • 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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    Finite element analysis of aeroacoustic jet-flap flows (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computational analysis was performed on the steady, turbulent aerodynamic flowfields associated with a jet-blown flap. For regions devoid of flow separation, a parabolic approximation to the governing time-averaged Navier-Stokes equations was applied. Numerical results are presented for the symmetry plane flow of a slot-nozzle planar jet flap geometry, including prediction of flowfield evolution within the secondary mixing region immediately downstream of the trailing edge. Using a two equation turbulence kinetic energy closure model, rapid generation and decay of large spatial gradients in mean and correlated fluctuating velocity components within the immediate wake region were predicted. Modifications to the turbulent flow structure, as induced by porous surface treatment of the flap, were evaluated. The recirculating flow within a representative discrete slot in the surface was evaluated, using the two dimensional, time-averaged Navier-Stokes equations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-2931 , COMOC-76TR-1.2
    Format: application/pdf
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  • 3
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    Modeling of three-dimensional mixing and reacting ducted flows (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computer code, based upon a finite element solution algorithm, was developed to solve the governing equations for three-dimensional, reacting boundary region, and constant area ducted flow fields. Effective diffusion coefficients are employed to allow analyses of turbulent, transitional or laminar flows. The code was used to investigate mixing and reacting hydrogen jets injected from multiple orifices, transverse and parallel to a supersonic air stream. Computational results provide a three-dimensional description of velocity, temperature, and species-concentration fields downstream of injection. Experimental data for eight cases covering different injection conditions and geometries were modeled using mixing length theory (MLT). These results were used as a baseline for examining the relative merits of other mixing models. Calculations were made using a two-equation turbulence model (k+d) and comparisons were made between experiment and mixing length theory predictions. The k+d model shows only a slight improvement in predictive capability over MLT. Results of an examination of the effect of tensorial transport coefficients on mass and momentum field distribution are also presented. Solutions demonstrating the ability of the code to model ducted flows and parallel strut injection are presented and discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-2661
    Format: application/pdf
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  • 4
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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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  • 5
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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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  • 6
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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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  • 7
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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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  • 8
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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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  • 9
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    Observations of energetic electrons /E no less than about 200 keV/ in the earth's magnetotail - Plasma sheet and fireball observations (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An earlier paper by the authors (1976) has reported on energetic electron anisotropies observed in conjunction with the acceleration regions identified by Frank et al., (1976). The present paper gives more detailed analyses of observations in the distant plasma sheet, including specific features of intensities, energy spectra, and pitch angle distributions of the very energetic electrons associated with intense plasma particle events, with energies ranging between 50 eV and 45 keV, detected with an electron/isotope spectrometer aboard the earth-orbiting spacecraft Imp 8. Two domains are considered: the plasma sheet and the regions near and within the localized magnetotail acceleration regions known as the fireball regions. The instrumentation used offered a number of observational advantages over many previous studies, including inherently low background, large geometric factors, excellent species identification, good angular distribution measurement capability, and availability of high resolution of differential intensities.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Apr. 1
    Format: text
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  • 10
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    Modeling of three-dimensional mixing and reacting ducted flows (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A computer code based on a finite-element solution algorithm is developed to perform an analytical investigation on the turbulent mixing and reaction of hydrogen jets injected from multiple orifices transverse and parallel to a supersonic airstream. A laser optical cavity flow field was also analyzed to demonstrate the generality of the proposed model. Computational results provide a three-dimensional description of velocity, temperature, and species-concentration fields downstream of injection. Major conclusions are that the analysis has immediate utility in evaluating the mixing effectiveness of transverse H2 injection data since it has been tested in its ability to model this type of data and that turbulent mixing length theory, constant effective Prandtl number, and a Lewis number of unity provide reasonable agreement with transverse H2 injection data downstream of the near-injection region. Efforts are presently being directed toward using the code in modeling laser and scramjet data for a wide range of flow conditions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 76-49 , Aerospace Sciences Meeting; Jan 26, 1976 - Jan 28, 1976; Washington, DC
    Format: text
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