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  • 1
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    Solar pond (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Shallow pools of liquid to collect low-temperature solar generated thermal energy are described. Narrow elongated trenches, grouped together over a wide area, are lined with a heat-absorbing black liner. The heat-absorbing liquid is kept separate from the thermal energy removing fluid by means such as clear polyethylene material. The covering for the pond may be a fluid or solid. If the covering is a fluid, fire fighting foam, continuously generated, or siloons are used to keep the surface covering clean and insulated. If the thermal energy removing fluid is a gas, a fluid insulation layer contained in a flat polyethlene tubing is used to cover the pond. The side of the tube directed towards the sun is treated to block out ultraviolet radiation and trap in infrared radiation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Low cost solar energy collection system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fixed, linear, ground-based primary reflector having an extended, curved sawtooth contoured surface covered with a metallized polymeric reflecting material, reflected solar energy to a movably supported collector that was kept at the concentrated line focus of the reflector primary. Efficient utilization leading to high temperatures from the reflected solar energy was obtained by cylindrical shaped secondary reflectors that directed off-angle energy to the absorber pipe.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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  • 3
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    Portable linear-focused solar thermal energy collecting system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A solar heat collection system is provided by utilizing a line-focusing device that is effectively a cylindrically curved concentrator within a protected environment formed by a transparent inflatable casing. A target, such as a fluid or gas carrying conduit is positioned within or near the casing containing the concentrator, at the line focus of the concentrator. The casing can be inflated at the site of use by a low pressure air supply to form a unitary light weight structure. The collector, including casing, concentrator and target, is readily transportable and can be used either at ground level or on rooftops. The inflatable concentrator can be replaced with a rigid metal or other concentrator while maintaining the novel advantages of the whole solar heat collection system.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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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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    Primary reflector for solar energy collection systems (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fixed, linear, ground-based primary reflector is disclosed which has an extended curved sawtooth-contoured surface covered with a metalized polymeric reflecting material. The device reflects solar energy to a movably supported collector that is kept at the concentrated line focus of the reflector primary. The primary reflector may be constructed by a process utilizing well-known freeway paving machinery.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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  • 6
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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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  • 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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  • 9
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    Solar energy collection system (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A fixed, linear, ground-based primary reflector having an extended curved sawtooth-contoured surface covered with a metalized polymeric reflecting material, reflects solar energy to a movably supported collector that is kept at the concentrated line focus reflector primary. The primary reflector may be constructed by a process utilizing well known freeway paving machinery. The solar energy absorber is preferably a fluid transporting pipe. Efficient utilization leading to high temperatures from the reflected solar energy is obtained by cylindrical shaped secondary reflectors that direct off-angle energy to the absorber pipe. A seriatim arrangement of cylindrical secondary reflector stages and spot-forming reflector stages produces a high temperature solar energy collection system of greater efficiency.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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  • 10
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    Primary reflector for solar energy collection systems and method of making same (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Solar energy is reflected to a movably supported collector that is kept at the concentrated line focus of the reflector primary by a fixed, linear, ground-based primary reflector having an extended curved sawtooth contoured surface covered with a metalized polymeric reflecting material. The primary reflector was constructed by a process utilizing well-known freeway paving machinery.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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