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  • 2020-2022
  • 1995-1999
  • 1980-1984
  • 1975-1979  (4)
  • 1940-1944
  • 1976  (4)
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  • 2020-2022
  • 1995-1999
  • 1980-1984
  • 1975-1979  (4)
  • 1940-1944
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  • 1
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    Zone-forming fungi experiment MA-147 (1976)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Streptomyces levoris was used as an experimental microorganism during the Apollo Soyuz Test Project to study specific biological considerations that may be influenced by space flight factors. Preflight, inflight, and postflight growth rates of the cultures were compared by photographing the specimens at regular intervals. Preliminary results based on visual comparison of the photographic data indicate that an increased growth rate occurred during space flight in two of eight flight specimens. The increased growth rate continued in the two specimens during the postflight period until termination of the experiment. Radiation effects may be responsible for the absence of spores in two areas of the last spore ring that was formed during the inflight period in one of the flight cultures; however, the radiation studies related to this experiment have not been completed. Distinct morphological differences in spore rings were observed when postflight spore rings were compared with inflight spore rings. Factors that are related to space flight recovery and reentry into earth gravity may have effected these alterations.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Apollo-Soyuz Test Project; 12 p
    Format: text
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  • 2
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    Effect of grazing flow on steady-state resistance of isolated square-edged orifices (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Steady state diagnostic testing of an isolated orifice has shown the nature of the interaction between grazing and orifice flow causing the large increase in orifice resistance for both inflow and outflow. A simple inviscid interaction model is developed which uses thin aerofoil theory to account for pressure forces exerted at the interface between the orifice and grazing flow together with a one-dimensional discharge coefficient concept. The effect of grazing flow boundary layer thickness is also included in the model. Resistance measurements for each orifice tested, over a wide range of grazing flow speeds and flow rates, collapse into a single curve when plotted in terms of effective discharge coefficient against orifice to grazing velocity ratio. The correlation curves for inflow and outflow are different. Data for clustered orifices collapse in the same way as those for the single orifice. The effect of boundary layer thickness is compared with model predictions.
    Keywords: ACOUSTICS
    Type: NASA-CR-2681
    Format: application/pdf
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  • 3
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    Fluid mechanical model of the acoustic impedance of small orifices (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fluid mechanical model of the acoustic behavior of small orifices is presented which predicts orifice resistance and reactance as a function of incident sound pressure level, frequency, and orifice geometry. Agreement between predicted and measured values is excellent. The model shows the following: (1) The acoustic flow in immediate neighborhood of the orifice can be modeled as a locally spherical flow. Within this near field, the flow is, to a first approximation, unsteady and incompressible. (2) At very low sound pressure levels, the orifice viscous resistance is directly related to the effect of boundary-layer displacement along the walls containing the orifice, and the orifice reactance is directly related to the inertia of the oscillating flow in the neighborhood of the orifice. (3) For large values of the incident acoustic pressure, the impedance is dominated by nonlinear jet-like effects. (4) For low values of the pressure, the resistance and reactance are roughly equal.
    Keywords: ACOUSTICS
    Type: NASA-CR-2682
    Format: application/pdf
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  • 4
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    Joint inflight biomedical experiments performed during the ASTP spaceflight (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Two joint inflight biomedical experiments were conducted during the unique Apollo-Soyuz Test Project (ASTP) spaceflight. One experiment evaluated rhythmicity of spore production of Streptomyces levoris. The other evaluated components of the infectious disease process by measuring alteration in: (1) the composition of the microbial population inhabiting USA and USSR crewmembers and spacecraft; (2) the ability of each crewmember's defense mechanism to resist infection; and (3) the ability of certain microorganisms to originate infections. These two experiments are described and the major results discussed.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: IAF PAPER 76-031 , International Astronautical Congress; Oct 10, 1976 - Oct 16, 1976; Anaheim, CA
    Format: text
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