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  • Other Sources  (144)
  • BIOTECHNOLOGY  (86)
  • GENERAL  (58)
  • Analytical Chemistry and Spectroscopy
  • Cell & Developmental Biology
  • Chemistry
  • 1970-1974  (144)
  • 1955-1959
  • 1974  (64)
  • 1973  (80)
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  • 1970-1974  (144)
  • 1955-1959
Year
  • 1
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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
  • 2
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    Plasma volume and blood constituent shifts during +Gz acceleration after bedrest with exercise conditioning (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: BIOTECHNOLOGY
    Type: Aerospace Medicine; 45; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Light flashes observed by astronauts on Apollo 11 through Apollo 17 (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The crew members on the last seven Apollo flights observed light flashes that are tentatively attributed to cosmic ray nuclei (atomic number equal to or greater than 6) penetrating the head and eyes of the observers. Analyses of the event rates for all missions has revealed an anomalously low rate for transearth coast observations with respect to translunar coast observations.
    Keywords: BIOTECHNOLOGY
    Type: Science; 183; Mar. 8
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    NASA TECHNICAL REPORTS
  • 4
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    Measurement of plasma temperature and density using radiation absorption (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A procedure, using a light beam of predetermined wavelength, preferably monochromatic, for measuring plasma characteristics is presented. Light absorbed by the plasma is used to obtain an absorption coefficient for the plasma. From this known coefficient and independent measurement of either the electron density or temperature of the plasma, an equation may be solved to obtain other unknown quantities. In this procedure, the absorption coefficient of the plasma is derived simultaneously for two probing light beams of substantially different predetermined wavelengths. These two coefficients are used to solve the two equations, which are in turn used to determine plasma electron density and temperature.
    Keywords: GENERAL
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Helicopter flight investigation to determine the effects of a closed-circuit TV on performance of a precision sling-load handling task (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Helicopter sling-load operations have been limited during hover and low-speed flight by the degree of precision achieved by the pilot/helicopter/sling-load combination. Previous attempts to improve precision have included stabilization of the load and helicopter and the addition of a pilot station directly facing the load. In these tests, use of a closed-circuit TV as a display that would permit sling-load delivery and placement by the forward-facing pilot was evaluated using a CH-54B helicopter. In all, three test cases were documented, which included the following: (1) forward-facing pilot using the TV display, (2) forward-facing pilot using verbal commands from a load-facing observer, and (3) aft-facing pilot using direct visual cues. The results indicate that a comparable level of performance was achieved for each test case; however, an increase in pilot workload was noted when the TV system was used.
    Keywords: BIOTECHNOLOGY
    Type: AHS PREPRINT 862 , Annual National V/STOL Forum; May 07, 1974 - May 09, 1974; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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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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    NASA TECHNICAL REPORTS
  • 7
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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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    NASA TECHNICAL REPORTS
  • 8
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    An integrated human thermal system and its unsteady-state simulation (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Consideration of an integrated human thermal system consisting of a human thermal system proper and an external thermal device. A mathematical model of the integrated system has been used in a computer simulation, and the simulation results have been verified through comparison with the results of experiments carried out on nine human subjects. The comparison indicates that the model simulates the system reasonably well.
    Keywords: BIOTECHNOLOGY
    Type: International Journal of Biomedical Engineering; 1; 1, 19; 1973
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Transmitting and reflecting diffuser (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A near-Lambertian diffuser is described which transmits and reflects ultraviolet light. An ultraviolet grade fused silica substrate is coated with vaporized fuse silica. The coating thickness is controlled, one thickness causing ultraviolet light to diffuse and another thickness causing ultraviolet light to reflect a near Lambertian pattern.
    Keywords: GENERAL
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Projection of school district enrollments (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The objectives were to provide a better statistical basis for enrollment projections, to attempt to model the school district's enrollment, and to produce a single estimate of enrollment for each grade, grade group, and ethnic group, and for the total by year. Efforts were also made to provide error estimates for the projections, to design a simple, user-oriented computer program for use by school district administrators, and to work with real data from local school districts and aid them in making projections on an experimental basis. The study at Jet Propulsion Laboratory was concerned with projection methodology and production of a generally usable computer program.
    Keywords: GENERAL
    Type: AIAA PAPER 74-850 , Mechanics and Control of Flight Conference; Aug 05, 1974 - Aug 09, 1974; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
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