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  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (167)
  • 2020-2023
  • 1975-1979  (167)
  • 1
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    Methods and new approaches to the calculation of physiological parameters by videodensitometry (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A complex system featuring a video-camera connected to a video disk, cine (medical motion picture) camera and PDP-9 computer with various input/output facilities has been developed. This system enables the performance of quantitative analysis of various functions recorded in clinical studies. Several studies are described, such as heart chamber volume calculations, left ventricle ejection fraction, blood flow through the lungs and also the possibility of obtaining information about blood flow and constrictions in small cross-section vessels
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Seminar on Low light level devices for science and technology; Mar 22, 1976 - Mar 23, 1976; Reston, VA
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    NASA TECHNICAL REPORTS
  • 2
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    Bosch - An alternate CO2 reduction technology (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Bosch process is the most promising CO2 reduction concept for future prolonged space missions. The paper presents the design of a three-person-capacity preprototype B-CRS (Bosch-based CO2 Reduction Subsystem). It is sized to reduce 3.0 kg/d CO2 generated by the crew and to supply the product water to an O2 generation subsystem to obtain O2. The design supports future development of the B-CRS as an alternative CO2 reduction subsystem to the Sabatier-based process presently under test at NASA. The discussion covers the Bosch CO2 reduction concept, process and hardware description, performance parameters, design specifications, subsystem schematic and operation, mechanical subsystem summary, control/monitor instrumentation, and subsystem packaging. A B-CRS with a proven technological base is an attractive CO2 reduction subsystem that eliminates overboard venting.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: ASME PAPER 79-ENAS-32 , Intersociety Conference on Environmental Systems; Jul 16, 1979 - Jul 19, 1979; San Francisco, CA
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  • 3
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    Development of the electrochemically regenerable carbon dioxide absorber for portable life support system application (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: As the length of manned space missions increase, more ambitious extravehicular activities (EVAs) are required. For the projected longer mission the use of expendables in the portable life support system (PLSS) will become prohibited due to high launch weight and volume requirements. Therefore, the development of a regenerable CO2 absorber for the PLSS application is highly desirable. The paper discusses the concept, regeneration mechanism, performance, system design, and absorption/regeneration cycle testing of a most promising concept known as ERCA (Electrochemically Regenerable CO2 Absorber). This concept is based on absorbing CO2 into an alkaline absorbent similar to LiOH. The absorbent is an aqueous solution supported in a porous matrix which can be electrochemically regenerated on board the primary space vehicle. With the metabolic CO2 recovery the ERCA concept results in a totally regenerable CO2 scrubber. The ERCA test hardware has passed 200 absorption/regeneration cycles without performance degradation.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: ASME PAPER 79-ENAS-33 , Intersociety Conference on Environmental Systems; Jul 16, 1979 - Jul 19, 1979; San Francisco, CA
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  • 4
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    Slushy weightings for the optimal pilot model (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A pilot model is described which accounts for the effect of motion cues in a well defined visual tracking task. The effect of visual and motion cues are accounted for in the model in two ways. First, the observation matrix in the pilot model is structured to account for the visual and motion inputs presented to the pilot. Secondly, the weightings in the quadratic cost function associated with the pilot model are modified to account for the pilot's perception of the variables he considers important in the task. Analytic results obtained using the pilot model are compared to experimental results and in general good agreement is demonstrated. The analytic model yields small improvements in tracking performance with the addition of motion cues for easily controlled task dynamics and large improvements in tracking performance with the addition of motion cues for difficult task dynamics.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Res. Center 11th Ann. Conf. on Manual Control; p 526-540
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  • 5
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    Discrete time modelization of human pilot behavior (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: This modelization starts from the following hypotheses: pilot's behavior is a time discrete process, he can perform only one task at a time and his operating mode depends on the considered flight subphase. Pilot's behavior was observed using an electro oculometer and a simulator cockpit. A FORTRAN program has been elaborated using two strategies. The first one is a Markovian process in which the successive instrument readings are governed by a matrix of conditional probabilities. In the second one, strategy is an heuristic process and the concepts of mental load and performance are described. The results of the two aspects have been compared with simulation data.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Res. Center 11th Ann. Conf. on Manual Control; p 119-129
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  • 6
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    In-vivo bone strain telemetry in monkeys /M. nemestrina/ (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A new method for collecting in-vivo bone strain data in monkeys has been developed and tested. The method includes a system which consists of a new design of implantable strain transducer and its companion telemetry package. The transducer fits into a hole drilled in a monkey tibia and is threaded for subsequent bone ingrowth. The transducers and telemetry package are biocompatible for over 503 days. The telemetry package uses Pulse Interval Ratio Modulation (PIRM) to transmit strain information to receiving equipment located outside the animal housing cage.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
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  • 7
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    An electrode system for tetrapolar electrical impedance plethysmography of the finger (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A rigid band electrode system is described which facilitates location of the recording electrodes of a tetrapolar impedance plethysmograph used for measuring pulsations of blood in a finger segment. The electrodes can be relocated accurately, and the volume of the finger segment under study can be precisely defined. The new system ensures good electrical contact and minimizes movement artifacts in the plethysmograph trace by holding the finger segment in a firm position.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: IEEE Transactions on Biomedical Engineering; BME-24; July 197
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  • 8
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    Computer quantitation of coronary angiograms (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A computer technique is being developed at the Jet Propulsion Laboratory to automate the measurement of coronary stenosis. A Vanguard 35mm film transport is optically coupled to a Spatial Data System vidicon/digitizer which in turn is controlled by a DEC PDP 11/55 computer. Programs have been developed to track the edges of the arterial shadow, to locate normal and atherosclerotic vessel sections and to measure percent stenosis. Multiple frame analysis techniques are being investigated that involve on the one hand, averaging stenosis measurements from adjacent frames, and on the other hand, averaging adjacent frame images directly and then measuring stenosis from the averaged image. For the latter case, geometric transformations are used to force registration of vessel images whose spatial orientation changes.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
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  • 9
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    New control concept of anthropomorphic manipulators (1975)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The control of active articulated mechanisms involves the construction of trajectories and corresponding forces (torques). Two procedures for developing mathematical models of manipulator dynamics are explored. The control task can be formulated as follows: define the dynamic control parameters of the basic manipulator configuration with three degrees of freedom, which should perform movements at N points of the working space. The task can be solved by forming programmed coordinated motion which have to realize the adopted tip trajectory.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: JPL The 2nd Conf. on Remotely Manned Sy; 93-94
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  • 10
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    A quasi-linear control theory analysis of timesharing skills (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Performance with practice on two dual-task combinations, dual-axis tracking and two discrete information processing tasks, is examined in an effort to identify the presence and development of specific time sharing skills, such as parallel information processing or rapid intertask switching. The generality of time sharing skills also is investigated by examining transfer of these skills between the two qualitatively different task combinations.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: MIT Proc., 13th Ann. Conf. on Manual Control; p 35-43
    Format: application/pdf
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