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  • BIOTECHNOLOGY  (130)
  • PROPULSION SYSTEMS  (118)
  • ASTROPHYSICS
  • 1970-1974  (248)
  • 1972  (112)
  • 1971  (136)
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Keywords
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  • 1970-1974  (248)
Year
  • 1
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    Shuttle- Life support, protective systems, and crew system interface technology (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Space shuttle life support, protective and crew system interfaces, discussing food and waste management and accident procedures
    Keywords: BIOTECHNOLOGY
    Type: ; VUE SCIENTIFIQUE ET
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Optimization of life support systems and their systems reliability (1971)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The identification, analysis, and optimization of life support systems and subsystems have been investigated. For each system or subsystem that has been considered, the procedure involves the establishment of a set of system equations (or mathematical model) based on theory and experimental evidences; the analysis and simulation of the model; the optimization of the operation, control, and reliability; analysis of sensitivity of the system based on the model; and, if possible, experimental verification of the theoretical and computational results. Research activities include: (1) modeling of air flow in a confined space; (2) review of several different gas-liquid contactors utilizing centrifugal force: (3) review of carbon dioxide reduction contactors in space vehicles and other enclosed structures: (4) application of modern optimal control theory to environmental control of confined spaces; (5) optimal control of class of nonlinear diffusional distributed parameter systems: (6) optimization of system reliability of life support systems and sub-systems: (7) modeling, simulation and optimal control of the human thermal system: and (8) analysis and optimization of the water-vapor eletrolysis cell.
    Keywords: BIOTECHNOLOGY
    Type: NASA-CR-136276
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Odor test (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: To prevent the use of spacecraft material that would outgas objectionable or nauseating odors, an odor test was developed. This test provided a means whereby candidate spacecraft materials were subjected to a particular environment and the outgassed products were evaluated by an odor panel. This panel was comprised of individuals with acute olfactory senses. The test results of the odor panel provided design engineers with data regarding potential material-odor problems. The odor-test procedure, panel-member selection, and odor scoring methods are described and typical test results are presented.
    Keywords: BIOTECHNOLOGY
    Type: Conf. on Mater. for Improved Fire Safety; p 203-205
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    V/STOL propulsion (1971)
    In:  CASI
    Details
    Publication Date: 2006-04-20
    Description: Propulsion technology for STOL and V/STOL commercial aircraft
    Keywords: PROPULSION SYSTEMS
    Type: AIRCRAFT PROPULSION 1971; P 135-168
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Simulation of a steady-state integrated human thermal system. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The mathematical model of an integrated human thermal system is formulated. The system consists of an external thermal regulation device on the human body. The purpose of the device (a network of cooling tubes held in contact with the surface of the skin) is to maintain the human body in a state of thermoneutrality. The device is controlled by varying the inlet coolant temperature and coolant mass flow rate. The differential equations of the model are approximated by a set of algebraic equations which result from the application of the explicit forward finite difference method to the differential equations. The integrated human thermal system is simulated for a variety of combinations of the inlet coolant temperature, coolant mass flow rate, and metabolic rates.
    Keywords: BIOTECHNOLOGY
    Type: Computers in Biology and Medicine; 2; 1972
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  • 6
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    Upper-stage space shuttle propulsion by means of separate scramjet and rocket engines (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A preliminary mission study of a reusable vehicle from staging to orbit indicates payload advantages for a dual-propulsion system consisting of separate scramjet and rocket engines. In the analysis the scramjet operated continuously and the initiation of rocket operation was varied. For a stage weight of 500,000 lb the payload was 10.4 percent of stage weight or 70 percent greater than that of a comparable all-rocket-powered stage. When compared with a reusable two-state rocket vehicle having 50,000 lb payload, the use of the dual propulsion system for the second stage resulted in significant decreases in lift-off weight and empty weight, indicating possible lower hardware costs.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TN-D-6762 , E-6555
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Skin and muscle components of forearm blood flow in directly heated resting man. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Changes in forearm muscle blood flow (FMBF) during direct whole-body heating were measured in 17 normal subjects using three different methods. We conclude that FMBF is not increased by direct whole-body heating. Since renal and splanchnic blood flow fall 30% under these conditions, maximal total skin blood flow in 12 previously studied subjects can be estimated from the rise in cardiac output to be 7.6 L/min (3.0-11.1 L/min).
    Keywords: BIOTECHNOLOGY
    Type: Journal of Applied Physiology; 32; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Jet-noise reduction through liquid-base foam injection. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An experimental investigation has been made of the sound-absorbing properties of liquid-base foams and of their ability to reduce jet noise. Protein, detergent, and polymer foaming agents were used in water solutions. A method of foam generation was developed to permit systematic variation of the foam density. The investigation included measurements of sound-absorption coefficents for both plane normal incidence waves and diffuse sound fields. The intrinsic acoustic properties of foam, e.g., the characteristic impedance and the propagation constant, were also determined. The sound emitted by a 1-in.-diam cold nitrogen jet was measured for subsonic (300 m/sec) and supersonic (422 m/sec) jets, with and without foam injection. Noise reductions up to 10 PNdB were measured.
    Keywords: PROPULSION SYSTEMS
    Type: Acoustical Society of America; vol. 50
    Format: text
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  • 9
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    Simulation of a steady-state integrated human thermal system. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The mathematical model of an integrated human thermal system is formulated. The system consists of an external thermal regulation device on the human body. The purpose of the device (a network of cooling tubes held in contact with the surface of the skin) is to maintain the human body in a state of thermoneutrality. The device is controlled by varying the inlet coolant temperature and coolant mass flow rate. The differential equations of the model are approximated by a set of algebraic equations which result from the application of the explicit forward finite difference method to the differential equations. The integrated human thermal system is simulated for a variety of combinations of the inlet coolant temperature, coolant mass flow rate, and metabolic rates. Two specific cases are considered: (1) the external thermal regulation device is placed only on the head and (2) the devices are placed on the head and the torso. The results of the simulation indicate that when the human body is exposed to hot environment, thermoneutrality can be attained by localized cooling if the operating variables of the external regulation device(s) are properly controlled.
    Keywords: BIOTECHNOLOGY
    Type: Computers in Biology and Medicine; 2; Feb. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    An improved cell volume analyzer (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Cell volume analyzer for sensing individual blood cells and plotting number as function of size
    Keywords: BIOTECHNOLOGY
    Type: ; ANSPORTURI AUTO, NAV
    Format: text
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    NASA TECHNICAL REPORTS
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