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  • ASTROPHYSICS  (2)
  • INORGANIC AND PHYSICAL CHEMISTRY  (2)
  • 1985-1989  (4)
  • 1989  (2)
  • 1988  (2)
  • 1
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    Radio properties of the highly polarized, quiescent quasar OI 287 (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The highly polarized, quiescent quasar OI 287 has been observed with high resolution at 2 cm and 6 cm in an effort to determine the origin of some of the object's peculiar properties. The results seem to rule out the classification of OI 287 as a blazar. Extrapolation of the radio core spectrum to midinfrared wavelengths fails to predict the infrared flux by at least an order of magnitude. This supports the conclusion that the infrared emission and the radio emission do not originate in the same synchrotron-emitting component. The high optical polarization could be related to possible broad absorption lines in the unobserved UV regime, or it could be caused by reflection into the line of sight by scattering agents distributed in a thin disk.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 328; 569-577
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Modelling ignition characteristics of rich H2/O2 mixture in a monolithic catalytic reactor (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ignition of rich hydrogen-oxygen mixture in a monolithic catalytic reactor is studied using a transient combustion model. The model assumes a quasi-steady gas phase and a thermally-thin substrate. The ignition time lag is due to the thermal inertia of the substrate. One-step global chemical reaction is assumed both on the surface and in the gas phase. An effectiveness factor is introduced to account for the transition from a kinetically-limited catalytic surface reaction to a diffusion-limit one during ignition. Results presented include a catalytic ignition boundary, ignition delay time and the transient response in the catalytic bed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: AIAA PAPER 88-3224
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Radio structures of Seyfert galaxies. VII - Extension of a distance-limited sample (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The VLA has been used at 6 and 20 cm to observe 27 Seyfert galaxies with recessional velocities less than 4600 km/s that had not been mapped previously. The sample shows weak trends for Seyfert 2 galaxies to have more luminous and larger radio sources than Seyfert 1 galaxies. A 20 cm radio luminosity function is constructed for each Seyfert type and shown to be fairly flat for powers betwen 10 to the 20th and 10 to the 23rd W/Hz. About 10 percent of the galaxies in the present sample may have flat-spectrum components contributing a substantial amount of their total flux density at centimeter wavelengths.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 343; 659-671
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Near-Limit Flame Spread over a Thin Solid Fuel in Microgravity (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Diffusion flame spread over a thin solid fuel in quiescent and slowly moving atmospheres is studied in microgravity. The flame behavior is observed to depend strongly on the magnitude of the relative velocity between the flame and the atmosphere. In particular, a low velocity quenching limit is found to exist in low oxgen environments. Using both the microgravity results and previously published data at high opposed-flow velocities, the flame spread behavior is examined over a wide velocity range. A flammability map using molar oxygen percentages and characteristic relative velocities as coordinates is constructed. Trends of flame spread rate are determined and mechanisms for flame extinction are discussed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: E-8357 , Symposium (International) on Combustion; Aug 14, 1988 - Aug 19, 1988; Seattle, WA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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