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  • 1990-1994  (9)
  • 1970-1974  (5)
  • 11
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    Measurements of local skin friction downstream of grit-type boundary-layer-transition trips at M equals 2.17 and zero heat transfer (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Supersonic skin friction measurements in grit type boundary layer transition trips with zero heat transfer
    Keywords: AERODYNAMICS
    Type: ; SEARCH(
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Measurement of cosmic ray positron and negatron spectra between 50 and 800 MeV (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A balloon-borne magnetic spectrometer was used to measure the spectra of cosmic ray positrons and negatrons at energies between 50 and 800 MeV. Comparisons of the separate positron and negatron spectra observed near the earth with their expected intensities in interstellar space can be used to investigate the complex (and variable) interaction of galactic cosmic rays with the expanding solar wind. The present measurements, which have established finite values or upper limits for the positron and negatron spectral between 50 and 800 MeV, have confirmed earlier evidence for the existence of a dominant component of negatrons from primary sources in the galaxy. The present results are shown to be consistent with the hypothesis that the positron component is in fact mainly attributable to collisions between cosmic ray nuclei and the interstellar gas. The estimate of the absolute intensities confirm the indications from neutron monitors that in 1972 the interplanetary cosmic ray intensities were already recovering toward their high levels observed in 1965.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70580 , X-660-74-16
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    Role of Landau damping in crossed-field electron beams and inviscid shear flow (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Landau damping and stability of low density crossed field electron beams using analogy with inviscid shear flows
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
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    NASA TECHNICAL REPORTS
  • 14
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    Measurement of cosmic ray positron and negatron spectra between 50 and 800 MeV (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A magnetic spectrometer employing digital-readout spark chambers and a gas Cerenkov threshold counter was used to measure the spectra of cosmic ray negatrons and positrons over the range from 50 to 800 MeV during two balloon flights from Ft. Churchill, Manitoba, in July 1972. A preliminary analysis of data from the first flight suggests that the total electron spectrum in this range has not fully recovered to its condition at solar minimum observed in 1965. The preliminary results also provide upper limits for the positive fraction over the range from 200 to 800 MeV which are consistent with the values found in earlier measurements.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 17, 1973 - Aug 30, 1973; Denver, CO
    Format: text
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    NASA TECHNICAL REPORTS
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