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  • INORGANIC AND PHYSICAL CHEMISTRY  (3)
  • ASTRONOMY  (2)
  • Chemistry  (1)
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1975-1979  (6)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Selenium-77 chemical shifts of cyclodiphosphazane selenides (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 391-392 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Isomeric cyclodiphosphazane selenides, R(X)P(NBu1)2P(Y)R (R=OMe or NMe2, X=Se, Y=lone pair; R=OMe or NMe2, X=Y=Se) display large differences (34-122 ppm) in 77Se chemical shift. The 77Se shifts of these and related amino derivatives are well to low field of the 77Se shifts of analogous acyclic phosphorus selenides.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120615
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    Paper (German National Licenses)
    Fulltext
  • 2
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    UBV photometry of asteroid 433 Eros (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: UBV observations of asteroid 433 Eros were conducted on 17 nights during the winter of 1974/75. The peak-to-peak amplitude of the light curve varied from about 0.3 mag to nearly 1.4 mag. The absolute V magnitude, extrapolated to zero phase, is 10.85. Phase coefficients of 0.0245 mag/degree, 0.0009 mag/degree, and 0.0004 mag/degree were derived for V, B-V, and U-B, respectively. The zero-phase color of Eros (B-V = 0.88, U-B = 0.50) is representative of an S (silicaceous) compositional type asteroid. The color does not vary with rotation. The photometric behavior of Eros can be modeled by a cylinder with rounded ends having an axial ratio of about 2.3:1.
    Keywords: ASTRONOMY
    Type: NASA-CR-143316
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    SAS-2 High energy gamma-ray observations of the Vela pulsar (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The second Small Astronomy Satellite high-energy (35 MeV) gamma-ray telescope detected pulsed gamma-ray emission at the radio period from PSR 0833-45, the Vela pulsar, as well as an unpulsed flux from the Vela region. The pulsed emission consists of two peaks, one following the radio peak by about 13 msec, and the other 0.4 period after the first. The luminosity of the pulsed emission above 100 MeV from Vela is about 0.1 that of the pulsar NP0532 in the Crab nebula, whereas the pulsed emission from Vela at optical wavelengths is less than 0.0004 that from the Crab. The relatively high intensity of the pulsed gamma-ray emission and the double peak structure, compared to the single pulse in the radio emission, suggests that the high energy gamma-ray pulsar emission may be produced under different conditions from those found at lower energies.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-70877 , X-662-75-102
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Flame characteristics of a NASA contra swirler module (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The structure of unconfined flames stabilized on a NASA contra-swirl can has been examined. The structure depends on reference velocity and fuel-air ratio, and photographic illustrations of representative examples of each flame type are shown. A highly compact flame is obtained over a narrow band of fuel-air ratios, within the total range over which flames may be stabilized, at high reference velocity (27.8 m/s). The compact structure can only be obtained with careful fuel nozzle location. Chemical concentration profiles, temperature profiles and sodium chloride seeding experiments all confirm the visual impression of compactness. A flame with 50% greater fuel throughput has a much less compact structure, which is reflected in lower maximum temperature, much more complex chemical concentration distributions and a more diffuse recirculation boundary as observed by sodium chloride seeding than in the compact flame. Each of these flames has not only an evident axial recirculation core but also a toroidal recirculation region over the bluff region between the inner and outer swirlers. In contrast, laser Doppler velocimetry measurements carried out on a flame with lower reference velocity (5.65 m/s) do not indicate the presence of a secondary recirculation region in this flame.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Spring Technical Meeting; Mar 28, 1977 - Mar 30, 1977; Cleveland, OH
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The effect of preheat on the structure of a swirl stabilized flame (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The effect of preheat on the temperature and species distributions in propane flames stabilized on a NASA contraswirl can has been examined. Flames with compact stable structure, inner-swirler airflow of 0.0091 kg/s, outer-swirler-plus-bypass airflow of 0.0203 kg/s, and propane injected 1 mm upstream of the inner swirler hub have been selected for detailed study. Over the inlet-air-temperature range from 300 to 673 K the maximum temperature in the flame increased by 40 to 60 K per 100-K increase in inlet air temperature. The point of maximum temperature on the center line approached the exit plane as inlet air temperature was increased. Oxygen, CO, H2, and methane were found together in gas samples taken from the flame, including the regions of maximum flame temperature.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: AIAA PAPER 78-28 , Aerospace Sciences Meeting; Jan 16, 1978 - Jan 18, 1978; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Flame characteristics of a NASA contra swirler module (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results are presented for an investigation of the structure of unconfined propane flames stabilized on a NASA contra-swirl can. General flame characterization, flame visualization by sodium chloride, temperature measurements, combustion products analysis, nitric oxide concentrations, and laser anemometer studies are considered. The results are discussed relative to sodium chloride visualization, temperature distributions, chemical composition of flames, nitric oxide distributions, and velocity distributions. It is shown that unconfined propane-air flames can be stabilized downstream of a NASA contra-swirl can under a wide range of airflow rates and fuel-air ratios. However, on increasing fuel input from the lowest at which flames can be stabilized, a compact recirculation zone-stabilized flame is formed. The effect of confinement on changes in flame shape and structure is determined.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: ASME PAPER 78-GT-163 , American Society of Mechanical Engineers, Gas Turbine Conference and Products Show; Apr 09, 1978 - Apr 13, 1978; London
    Format: text
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    NASA TECHNICAL REPORTS
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