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  • Other Sources  (5)
  • ENVIRONMENT POLLUTION  (3)
  • BIOTECHNOLOGY  (1)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
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  • Other Sources  (5)
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  • 1
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    Geothermal hazards - Mercury emission (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Enthusiasm for intensified geothermal exploration may induce many participants to overlook a long-term potential toxicity hazard possibly associated with the tapping of magmatic steam. The association of high atmospheric Hg levels with geothermal activity has been established both in Hawaii and Iceland, and it has been shown that mercury can be introduced into the atmosphere from fumaroles, hot springs, and magmatic sources. These arguments, extended to thallium, selenium, and other hazardous elements, underscore the need for environmental monitoring in conjunction with the delivery of magmatic steam to the surface.
    Keywords: ENVIRONMENT POLLUTION
    Type: Environmental Science and Technology; 9; May 1975
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A note on the biological activity of the noble gas compound xenon trioxide. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Comparison of xenon trioxide for toxicity in the few common oxidants using three bioassays. On a molar basis XeO3 and HOCl were similar, but XeO3 was less active than expected when comparisons were based on normality.
    Keywords: BIOTECHNOLOGY
    Type: Space Life Sciences; 3; June 197
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    NASA TECHNICAL REPORTS
  • 3
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    Chlorine bleaches - A significant long term source of mercury pollution (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Products of industrial electrolysis of brine - NaOCl-based bleaches and NaOH - yielded 17 to 1290 ppb of Hg upon flameless atomic absorption analysis. Compared with current U.S. rejection value of 5 ppb for potable waters, the above levels seem sufficiently high to be a matter of environmental concern.
    Keywords: ENVIRONMENT POLLUTION
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    NASA TECHNICAL REPORTS
  • 4
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    Water and soil biotic relations in Mercury distribution (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The distribution of Hg is considered both in terms of its availability in soil fractions and the relationship between Hg in plant samples and Hg in ambient soils or other supportive media. The plants were grouped by habitat into epipedic-epiphytic (mosses, lichens) and endopedic-aquatic-marine (Basidiomycetes and algae) samples; nonvascular and vascular forms were also distinguished. Sources included Alaska, Hawaii, New England and Iceland. Brief consideration was also given to Hg distribution in a plant-animal-soil community. Data were expressed in terms of plant Hg content and plant substratum concentration ratio. Average Hg contents and concentration ratios, and modal ranges for the ratios were determined. The results showed similar average Hg contents in all groups (126 to 199 ppb) but a low value (84 ppb) in the lichens; terrestrial forms had ratios of 3.5 to 7.6 whereas the marine algae yielded a figure of 78.7. A secondary mode in the range 0 to 0.1 appeared only in the Alaska-New England Group, over 500 km distant from active thermal sites. Evidence for both exclusion and concentration behavior was obtained.
    Keywords: ENVIRONMENT POLLUTION
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    NASA TECHNICAL REPORTS
  • 5
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    Attitude determination techniques for Nimbus 6 and Nimbus G (1977)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: Techniques for measuring attitude deviations in the Nimbus 6 and Nimbus G 3-axis stabilized, zero-momentum, earth observation satellites are presented. The on-orbit telemetered data include scanner roll and pitch error signals, an illuminated DSAS which can read the azimuth and elevation of the sunline when the spacecraft is not in the umbra, the signal from the single gyro in the RMP, and the momenta of the reaction wheels. Mathematical methods for interpreting the measured data are described with attention to filter equations, especially the Kalman filter because of its ability to eliminate high frequency noise.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Astrodynamics Specialist Conference; Sept. 7-9, 1977; Jackson Hole, WY; US
    Format: text
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    NASA TECHNICAL REPORTS
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