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  • Other Sources  (6)
  • SPACE RADIATION  (4)
  • FLUID MECHANICS AND HEAT TRANSFER  (2)
  • 1985-1989  (6)
  • 1925-1929
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  • Other Sources  (6)
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  • 1
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    Beamed emission from gamma-ray burst sources (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Gamma-ray bursts are intense fluxes of radiation in the 100 keV to several MeV energy range which typically persist for between a fraction of a second to several seconds. The observed spectral shape of these bursts suggest that the radiation is emitted as highly collimated beams emanating from neutron stars. This inference is based on the lack of significant gamma-gamma absorption (which are produced when gamma rays interact with stellar surfaces). The gamma-ray beams may be a consequence of a particle acceleration in double layers in neutron star magnetospheres.
    Keywords: SPACE RADIATION
    Type: NASA. Marshall Space Flight Center Double Layers in Astrophysics; p 305
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  • 2
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    High-energy thermal synchrotron emission (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is shown how the thermal synchrotron emission spectrum is modified when the photon energy is greater than the mean energy of the radiating particles. The effect if applying this energy conservation constraint is to produce spectra which have less high-energy photon emission than had been previously estimated. The thermal synchrotron spectra provide satisfactory fits to recently observed very high energy gamma ray spectra of certain burst sources.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 296; 65-68
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  • 3
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    Effects of rotation on impingement cooling of turbine blades (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The effects of rotation on impingement cooling of turbine blades were studied experimentally as a specialized facility at M.I.T. A foil heated resistively was cooled by a jet flow on one side and temperature monitored on the other. Rotating the blade limits the heat transfer path to conduction through the support structure and radiation. IR radiometry furnishes the temperature distributions on the chamber wall, permitting the internal heat transfer coefficient to be measured. The heat transfer efficiency has been found to fall as much as 30 percent as rotational speed increases. The conditions observed confirm the significance of rotational effects, particularly with regard to potential early blade failure.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 85-1217
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  • 4
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    Rotational effects on impingement cooling (1987)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The present consideration of rotation effects on heat transfer in a radially exhausted, impingement-cooled turbine blade model gives attention to experimental results for Reynolds and Rossby numbers and blade/coolant temperature ratio values that are representative of small gas turbine engines. On the basis of a model that encompasses the effects of Coriolis force and buoyancy on heat transfer, bouyancy is identified as the cause of an average Nusselt number that is 20-30 percent lower than expected from previous nonrotating data. A heuristic model is proposed which predicts that the impingement jets nearest the blade roots should deflect inward, due to a centripetal force generated by their tangential velocity counter to the blade motion. Potentially serious thermal stresses must be anticipated from rotation effects in the course of blade design.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 5
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    Analyzing gamma-ray burst spectral data (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The paper describes an improved method for calculating gamma-ray spectra of gamma-ray bursts. This method is independent of any assumed model for the incident spectrum. In many cases it makes it possible to perform chi-squared model fitting without detailed knowledge of the instrument response functions. The results of extensive calculations using simulated data and realistic response functions are presented; the Backus-Gilbert technique produces model-independent spectral estimates that are quantitatively accurate and easy to calculate.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 336; 896-919
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  • 6
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    A map of the cosmic background radiation at 3 millimeters (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Data from a series of balloon flights covering both the Northern and Southern Hemispheres, measuring the large angular scale anisotropy in the cosmic background radiation at 3.3 mm wavelength are presented. The data cover 85 percent of the sky to a limiting sensitivity of 0.7 mK per 7 deg field of view. The data show a 50-sigma (statistical error only) dipole anisotropy with an amplitude of 3.44 + or - 0.17 mK and a direction of alpha = 11.2 h + or - 0.1 h, and delta = -6.0 deg + or - 1.5 deg. A 90 percent confidence level upper limit of 0.00007 is obtained for the rms quadrupole amplitude. Flights separated by 6 months show the motion of earth around the sun. Galactic contamination is very small, with less than 0.1 mK contribution to the dipole quadrupole terms. A map of the sky has been generated from the data.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 298; L1-L5
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