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  • SPACE VEHICLES  (69)
  • BIOTECHNOLOGY  (53)
  • COMMUNICATIONS  (47)
  • ASTROPHYSICS
  • 1970-1974  (169)
  • 1960-1964
  • 1973  (169)
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  • 1970-1974  (169)
  • 1960-1964
Year
  • 1
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    A system for analysis and classification of voice communications (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method for analysis and classification of verbal communications typically associated with manned space missions or simulations was developed. The study was carried out in two phases. Phase 1 was devoted to identification of crew tasks and activities which require voice communication for accomplishment or reporting. Phase 2 entailed development of a message classification system and a preliminary test of its feasibility. The classification system permits voice communications to be analyzed to three progressively more specific levels of detail and to be described in terms of message content, purpose, and the participants in the information exchange. A coding technique was devised to allow messages to be recorded by an eight-digit number.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-128837
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Body water compartments during bed rest: Evaluation of analytical methods (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Nine healthy young men were studied to determine the reproducibility and interchangeability of the use of radio-iodinated human serum albumin and Evans Blue dye for estimating plasma volume, sodium bromide for extracellular fluid volume, and deuterium oxide for total body water volume. All subjects were tested in a semibasal condition and allowed to rest for at least 30 min. after arriving at the laboratory. The results indicate that there was uniform distribution of I131 and Evans Blue dye 10 min. after injection and of NaBr and D2O 3 hours after oral ingestion; the buildup of residual tracer did not interfere appreciably with the measurement of either or Evans Blue spaces when they are administered at equal intervals, and the buildup of background tracer after ingestion of NaBr and D2O once per week for three consecutive weeks did not affect the accuracy of the measurement. It was found that I131 and Evans Blue may be used interchangeably for estimating plasma volume; for estimating bromide and D2O spaces, one 3-hour equilibrium blood sample gives results similar to the extrapolation of multiple samples.
    Keywords: BIOTECHNOLOGY
    Type: NASA-TR-R-406 , A-4656
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Observations of noise bands associated with the upper hybrid resonance by the Imp 6 radio astronomy experiment. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The intense noise bands occurring near the upper hybrid resonance frequency have been observed with the Imp 6 GSFC radio astronomy experiment in the plasmasphere. The identification of the upper hybrid resonance provides an accurate measure of the local electron density and allows the observed noise data to be fit to the scale of characteristic frequencies in the plasma. The data are consistent with earlier theoretical interpretations in which noise is generated between the upper hybrid and plasma frequencies and propagates to region 4 of the CMA diagram, where it is reflected at the L = 0 plasma cutoff.
    Keywords: COMMUNICATIONS
    Type: Journal of Geophysical Research; 78; Apr. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A nonlinear programming approach for optimizing two-stage lifting vehicle ascent to orbit (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An optimal atmospheric flight branched trajectory-shaping capability is presented based on the Davidon-Fletcher-Powell variable metric parameter optimization technique. Gradient information is generated using finite difference methods. A typical atmospheric flight branched optimization problem is analyzed which requires the determination of 31 parameters. This parameter set includes the three-dimensional description of vehicle attitude control angles for three branches of flight: first-stage ascent, second-stage ascent, and first-stage flyback. The important inflight inequality contraints required to maintain the integrity of the vehicles are considered. Some of the numerical methods employed are discussed, along with several new auxiliary techniques developed to improve the compatibility of the numerical gradient and iterator.
    Keywords: SPACE VEHICLES
    Type: Automatica; 9; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    ATS-F Comsat Millimeter Wave Propagation Experiment (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The ATS-F Comsat Millimeter Wave Propagation Experiment has been designed to gather statistical data on the attenuation caused by rain at millimeter wave frequencies. These data will be used to determine system design parameters for future communications satellite systems operating at frequencies above 10 GHz. The experiment has 39 ground terminals transmitting at 13.2 or 17.8 GHz to a transponder on board the ATS-F satellite. The transponder retransmits these signals at 4 GHz to a central earth terminal which records their amplitudes once each second. The data will be analyzed to provide probabilities of attenuation as functions of parameters such as rainfall, location, and time. These probabilities can then be used to determine the required power margins of millimeter wave communications systems. Techniques of overcoming severe attenuation such as site diversity and the use of a spot beam to increase the power level at selected locations will also be evaluated.
    Keywords: COMMUNICATIONS
    Type: COMSAT Technical Review; 3; Fall 197
    Format: text
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  • 6
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    Synthesis of multiple shaped beam antenna patterns (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Results are presented of research into the problem of finding an excitation of a given antenna such that the desired radiation pattern is approximated to within acceptable limits. This is to be done in such a fashion that boundary conditions involving hardware limitations may be inserted into the problem. The intended application is synthesis of multiple shaped beam antennas. Since this is perhaps the most difficult synthesis problem an antenna engineer is likely to encounter, the approach taken was to include as a by-product capability for synthesizing simpler patterns. The synthesis technique has been almost totally computerized. The class of antennas which may be synthesized with the computer program are those which may be represented as planar (continuous or discrete) current distributions. The technique is not limited in this sense and could indeed by extended to include, for example, the synthesis of conformal arrays or current distributions on the surface of reflectors. The antenna types which the program is set up to synthesize are: line source, rectangular aperture, circular aperture, linear array, rectangular array, and arbitrary planar array.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-138982
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Application of NASA-developed technology to the automatic control of municipal sewage treatment plants (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A search was made of NASA developed technology and commercial technology for process control sensors and instrumentation which would be applicable to the operation of municipal sewage treatment plants. Several notable items were found from which process control concepts were formulated that incorporated these items into systems to automatically operate municipal sewage treatment plants. A preliminary design of the most promising concept was developed into a process control scheme for an activated sludge treatment plant. This design included process control mechanisms for maintaining constant food to sludge mass (F/M) ratio, and for such unit processes as primary sedimentation, sludge wastage, and underflow control from the final clarifier.
    Keywords: BIOTECHNOLOGY
    Type: NASA-CR-132340
    Format: application/pdf
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  • 8
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    Development of a direct condensing radiator for use in a spacecraft vapor compression refrigeration system. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: SPACE VEHICLES
    Type: ASME PAPER 73-ENAS-5 , Intersociety Conference on Environmental Systems; Jul 16, 1973 - Jul 19, 1973; San Diego, CA; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Design, capability, and cost of a Versatile Upper Stage /VUS/ family of vehicles. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Trade-off studies and a preliminary design were accomplished to investigate the Versatile Upper Stage (VUS) concept. This concept entails the development by one contractor of a family of stages with a great deal of commonality to perform a spectrum of potential unmanned automated missions planned through 1990. The trade studies and analyses revealed areas where the penalty for commonality between stages was excessive in weight and performance loss. This occurred in the selection of the vehicle structural shell. In many of the expensive subsystems, especially astrionics, it was found that establishing the requirements for all family members and the application of commonality in subsystem selection could result in significant savings.
    Keywords: SPACE VEHICLES
    Type: AIAA PAPER 73-589 , Joint Space Mission Planning and Execution Meeting; Jul 10, 1973 - Jul 12, 1973; Denver, CO
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    An environmental chamber system for prolonged metabolic studies on small animals (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurement of metabolic adaptation to marginally stressful environments requires both precise regulation of a variety of atmospheric factors for extended periods of time and the capacity to employ sensitive parameters in an undisturbed subject. This paper describes a metabolic chamber system which can simultaneously maintain groups of small animals in two completely separate closed environments having different pressures, temperatures and gas compositions for an indefinite period. Oxygen consumption, carbon dioxide production, food and water consumption and animal activity cycles can be continuously monitored and quantified 24 h per day while the animals are in an unrestrained state. Each chamber can be serviced and the animals handled, injected and sacrificed without subjecting them to barometric stress. Several unique electrical and mechanical components allow semi-automated data collection on a continuous basis for indefinite periods of time.
    Keywords: BIOTECHNOLOGY
    Type: Space Life Sciences; 4; Sept
    Format: text
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