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  • BIOTECHNOLOGY  (130)
  • PROPULSION SYSTEMS  (118)
  • COMMUNICATIONS  (112)
  • ASTROPHYSICS
  • 1970-1974  (360)
  • 1972  (173)
  • 1971  (187)
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  • 1970-1974  (360)
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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    Compression and error correction for TV (1971)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Data compression and error correcting codes applied to digital transmission of real time, standard format TV, along with voice and other data from Apollo spacecraft
    Keywords: COMMUNICATIONS
    Type: NASA. Manned Spacecraft Center Proc. of the Space Shuttle Integrated Electron. Conf., Vol. 2; p 311-328
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  • 6
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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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    NASA TECHNICAL REPORTS
  • 7
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    Design study for a high reliability five-year spacecraft tape transport (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Following the establishment of the overall transport concept, a study of all of the life limiting constraints associated with the transport were analyzed using modeling techniques. These design techniques included: (1) a response analysis from which the performance of the transport could be determined under operating conditions for a variety of conceptual variations both in a new and aged condition; (2) an analysis of a double cone guidance technique which yielded an optimum design for maximum guidance with minimum tape degradation; (3) an analysis of the tape pack design to eliminate spoking caused by negative tangential stress within the pack; (4) an evaluation of the stress levels experienced by the magnetic tape throughout the system; (5) a general review of the bearing and lubrication technology as applied to satellite recorders and hence the recommendation for using standard load carrying antifriction ball bearings; and (6) a kinetic analysis to determine the change in kinetic properties of the transport during operation.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-122453
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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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
  • 9
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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
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  • 10
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    A variable-step-size robust delta modulator. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Description of an analytically obtained optimum adaptive delta modulator-demodulator configuration. The device utilizes two past samples to obtain a step size which minimizes the mean square error for a Markov-Gaussian source. The optimum system is compared, using computer simulations, with a linear delta modulator and an enhanced Abate delta modulator. In addition, the performance is compared to the rate distortion bound for a Markov source. It is shown that the optimum delta modulator is neither quantization nor slope-overload limited. The highly nonlinear equations obtained for the optimum transmitter and receiver are approximated by piecewise-linear equations in order to obtain system equations which can be transformed into hardware. The derivation of the experimental system is presented.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communication Technology; COM-19; Dec. 197
    Format: text
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