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  • 1
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    Semitransparent curtains for control of optical radiation hazards (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The purposes and functions of semitransparent eye protective curtains are analyzed. Based upon this analysis, functional requirements are developed, and design requirements are specified for optimum curtains to be used with open arc welding and arc cutting processes. Such curtains also protect against other high intensity broad-spectral-band sources such as compact arc lamps. The requirements for filtering out hazardous UV radiation and blue light must be balanced against the need for transparency in the visible spectrum and the need for reduced glare. Infrared attenuation is shown to be of very little importance.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Applied Optics; 20; July 15
    Format: text
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  • 2
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    Environmental control/life support system for Space Station (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The functional, operational, and design load requirements for the Environmental Control/Life Support System (ECLSS) are described. The ECLSS is divided into two groups: (1) an atmosphere management group and (2) a water and waste management group. The interaction between the ECLSS and the Space Station Habitability System is examined. The cruciform baseline station design, the delta and big T module configuration, and the reference Space Station configuration are evaluated in terms of ECLSS requirements. The distribution of ECLSS equipment in a reference Space Station configuration is studied as a function of initial operating conditions and growth orbit capabilities. The benefits of water electrolysis as a Space Station utility are considered.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Earth-Oriented Applications of Space Technology (ISSN 0277-4488); 6; 2, 19; 213-229
    Format: text
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  • 3
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    Space Station Environmental Control/Life Support System engineering (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The present paper is concerned with a systems engineering study which has provided an understanding of the overall Space Station ECLSS (Environmental Control and Life Support System). ECLSS/functional partitioning is considered along with function criticality, technology alternatives, a technology description, single thread systems, Space Station architectures, ECLSS distribution, mechanical schematics per space station, and Space Station ECLSS characteristics. Attention is given to trade studies and system synergism. The Space Station functional description had been defined by NASA. The ECLSS will utilize technologies which embody regenerative concepts to minimize the use of expendables.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 851375
    Format: text
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  • 4
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    Transcutaneous measurement of volume blood flow (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Blood flow velocity measurements, using Doppler velocimeter, are described. The ability to measure blood velocity using ultrasound is derived from the Doppler effect; the change in frequency which occurs when sound is reflected or transmitted from a moving target. When ultrasound of the appropriate frequency is transmitted through a moving blood stream, the blood cells act as point scatterers of ultrasonic energy. If this scattered ultrasonic energy is detected, it is found to be shifted in frequency according to the velocity of the blood cells, nu, the frequency of the incident sound, f sub o, the speed of sound in the medium, c, and the angle between the sound beam and the velocity vector, o. The relation describing this effect is known as the Doppler equation. Delta f = 2 f sub o x nu x cos alpha/c. The theoretical and experimental methods are evaluated.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-155233
    Format: application/pdf
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  • 5
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    Development of ultrasonic methods of hemodynamic measurements (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A pulsed ultrasonic Doppler velocity meter which can be used (by modifying transducers) as a flowmeter for blood circulation was experimentally studied. Calculations and profiles of turbulent and laminar flow within blood vessels are shown. Graphs and charts of transducers are included.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-143458
    Format: application/pdf
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  • 6
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    Integrated air revitalization system for Space Station (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Fifty-one distinct functions are encompassed by the Space Station's Environmental Control and Life Support System; one exception to this noninteractivity of functions is the regenerative air revitalization system that removes and reduces CO2 and generates O2. The integration of these interdependent functions, and of humidity control, into a single system furnishes opportunities for process simplification as well as for power, weight and volume requirement reductions by comparison with discrete subsystems. Attention is presently given to a system which quantifies these integration-related savings and identifies additional advantages that accrue to this integrating design method.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 860946
    Format: text
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  • 7
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    The effect of changes in the USF/NASA toxicity screening test method on data from some cellular polymers (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Rankings of relative toxicity can be markedly affected by changes in test variables. Revision of the USF/NASA toxicity screening test procedure to eliminate the connecting tube and supporting floor and incorporate a 1.0 g sample weight, 200 C starting temperature, and 800 C upper limit temperature for pyrolysis, reversed the rankings of flexible polyurethane and polychloroprene foams, not only in relation to each other, but also in relation to cotton and red oak. Much of the change is attributed to reduction of the distance between the sample and the test animals, and reduction of the sample weight charged. Elimination of the connecting tube increased the relative toxicity of the polyurethane foams. The materials tested were flexible polyurethane foam, without and with fire retardant; rigid polyurethane foam with fire retardant; flexible polychloroprene foam; cotton, Douglas fir, red oak, hemlock, hardboard, particle board, polystyrene, and polymethyl methacrylate.
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Combustion Toxicology; 3; Aug. 197
    Format: text
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  • 8
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    Development of ultrasonic methods for hemodynamic measurements (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A transcutanous method to measure instantaneous mean blood flow in peripheral arteries of the human body was defined. Transcutanous and implanted cuff ultrasound velocity measurements were evaluated, and the accuracies of velocity, flow, and diameter measurements were assessed for steady flow. Performance criteria were established for the pulsed Doppler velocity meter (PUDVM), and performance tests were conducted. Several improvements are suggested.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-141235
    Format: application/pdf
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