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  • Other Sources  (2)
  • FLUID MECHANICS AND HEAT TRANSFER  (1)
  • NUCLEAR AND HIGH-ENERGY PHYSICS  (1)
  • 2000-2004
  • 1980-1984  (2)
  • 1965-1969
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  • Other Sources  (2)
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  • 2000-2004
  • 1980-1984  (2)
  • 1965-1969
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  • 1
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    Unknown
    Half-life of Si-32 from tandem-accelerator mass spectrometry (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A newly developed mass-spectrometry technique employing a tandem Van de Graaff accelerator together with a special beam-transport system and heavy-ion detector has been used to determine the half-life of Si-32. The result obtained, 108 plus or minus 18 yr, disagrees with the accepted value of 330 plus or minus 40 yr. The implications of the new half-life of Si-32, which is used for dating studies, are discussed.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Physical Review Letters; 45; Aug. 25
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    An experimental investigation on the subcritical instability in plane Poieseuille flow (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The relationship between the three dimensional properties of the fundamental flow of a plane Poieseuille flow and subcritical stability was studied. An S-T wave was introduced into the flow and the three dimensional development of the wave observed. Results indicate that: (1) the T-S wave has three dimensional properties which are synchronous with the fundamental flow, but there is damping at microamplitude; (2) when the amplitude reaches a certain threshold, subcritical instability and peak valley bifurcation occur simultaneously and a peak valley structure is formed; (3) this threshold depends to a great extent on the frequency; and (4) after the peak valley bifurcation there is a transition to a turbulent flow by the process of laminar flow collapse identical to that in Blasius flow.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75885
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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