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  • BIOTECHNOLOGY  (285)
  • FLUID MECHANICS  (224)
  • 1970-1974  (509)
  • 1950-1954
  • 1
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    An evaluation of Orbital Workshop passive thermal control surfaces (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The optical properties of selected Orbital Workshop thermal control surfaces are discussed from the time of their installation through the end of the Skylab missions. The surfaces considered are the goldized Kapton tape on the habitation area sidewall, the S-13G white paint on the Workshop aft skirt, and the multilayer insulation system on the forward dome of the habitation area. A quantitative assessment of the effects of exposure to the ascent and orbital environments is made including the effects of rocket exhaust plume contamination. Although optical property degradation of the external surfaces was noted, satisfactory thermal performance was maintained throughout the Skylab missions.
    Keywords: BIOTECHNOLOGY
    Type: ASME PAPER 74-ENAS-39 , Intersociety Conference on Environmental Systems; Jul 29, 1974 - Aug 01, 1974; Seattle, WA; US
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  • 2
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    System distortion errors in radiorespirometry curves. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Description of a method for evaluating the maximum error producible in the system distortion of a carrier gas type radiorespirometer. The maximum producible error is evaluated on the basis of a second order. The maximum producible decrease in peak height output is calculated as a function of the system's time constant or flow rate by using the system's transfer function and the Laplace transformation equation (Gardner and Barnes, 1961).
    Keywords: BIOTECHNOLOGY
    Type: International Journal of Applied Radiation and Isotopes; 22; 1971
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  • 3
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    C14-radiorespirometry system for astronaut medical monitoring. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A C14-CO2 radiorespirometry-computer system for monitoring human metabolism during space missions is described. Data collection using this apparatus is an effective 'real time' system allowing rapid, low-cost data processing which is ideal for telemetering signals from spacecraft to earth.
    Keywords: BIOTECHNOLOGY
    Type: Aerospace Medical Association, Annual Scientific Meeting; May 08, 1972 - May 11, 1972; Bal Harbour, FL
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  • 4
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    Eddy viscosity distributions in a Mach 20 turbulent boundary layer (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Shear stress and eddy viscosity distribution in Mach 20 compressible turbulent boundary layer, using mixing length flow theory
    Keywords: FLUID MECHANICS
    Type: ; IENCES (
    Format: text
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  • 5
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    Calculation of compressible adverse pressure gradient turbulent boundary layers. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Difficulties encountered in computing profile shapes in supersonic turbulent boundary layers with large pressure gradients, which result from a disagreement between data and theory, are investigated. Possible reasons given by various authors for this disagreement are discussed. Initial results seem to indicate that conventional reasons do not account for the observed difficulties. However, inclusion of the effect of curvature upon turbulent mixing has brought an improvement in calculations. Possible three-dimensional effects are also examined.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 10; Feb. 197
    Format: text
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  • 6
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    The contingent negative variation and the late positive wave of the average evoked potential (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: EEG analysis for poststimulus events, examining contingent negative variation and late positive wave of average evoked potential
    Keywords: BIOTECHNOLOGY
    Type: ; DIOTEKHNIKA (
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  • 7
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    Measurements, modeling, control and simulation - as applied to the human left ventricle for purposeful physiological monitoring. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Interdisciplinary engineering research effort in studying the intact human left ventricle has been employed to physiologically monitor the heart and to obtain its 'state-of-health' characteristics. The left ventricle was selected for this purpose because it plays a key role in supplying energy to the body cells. The techniques for measurement of the left ventricular geometry are described; the geometry is effectively displayed to bring out the abnormalities in cardiac function. Methods of mathematical modeling, which make it possible to determine the performance of the intact left ventricular muscle, are also described. Finally, features of a control system for the left ventricle for predicting the effect of certain physiological stress situations on the ventricle performance are discussed.
    Keywords: BIOTECHNOLOGY
    Type: Franklin Institute; vol. 292
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  • 8
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    Calculation of transitional boundary-layer flows. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The results of a finite-difference calculation of hypersonic transitional boundary-layer flow are presented. Precursor-transition and low Reynolds number turbulence effects are included. These calculation results are compared with data from a source where profiles are available at the beginning, middle and end of the hypersonic transitional flow. The results indicate that the low Reynolds number effect is the most important.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 11; Apr. 197
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  • 9
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    A local eddy viscosity model for turbulent shear flow (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: In the model described, the eddy viscosity is assumed to be a fluid property dependent on the state of the fluid locally, namely the local density, turbulent kinetic energy, turbulence scale, and Mach number. An empirical law was found which related eddy viscosity to these properties satisfactorily for free jets. This law is used without modification for a set of test cases in free shear layers, free-jet decay, coaxial mixing, and wakes. The scale of turbulence is taken as a constant at any axial location equal to the width of the shear layer. By utilizing the boundary-layer order-of-magnitude analysis, a coupled set of fluid dynamic equations is formulated, which of necessity includes the equation for the production of turbulent kinetic energy.
    Keywords: FLUID MECHANICS
    Type: NASA. Langley Res. Center Free Turbulent Shear Flows, Vol. 1; p 529-547
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  • 10
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    A rational approach to the use of Prandtl's mixing length model in free turbulent shear flow calculations (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Prandtl's basic mixing length model was used to compute 22 test cases on free turbulent shear flows. The calculations employed appropriate algebraic length scale equations and single values of mixing length constant for planar and axisymmetric flows, respectively. Good agreement with data was obtained except for flows, such as supersonic free shear layers, where large sustained sensitivity changes occur. The inability to predict the more gradual mixing in these flows is tentatively ascribed to the presence of a significant turbulence-induced transverse static pressure gradient which is neglected in conventional solution procedures. Some type of an equation for length scale development was found to be necessary for successful computation of highly nonsimilar flow regions such as jet or wake development from thick wall flows.
    Keywords: FLUID MECHANICS
    Type: Free Turbulent Shear Flows, Vol. 1; p 67-137
    Format: application/pdf
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