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  • 1
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    Multispectral sensing of citrus young tree decline (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Computer processing of MSS data to identify and map citrus trees affected by young tree decline is analyzed. The data were obtained at 1500-feet altitude in six discrete spectral bands covering regions from 0.53 to 1.3 millimicrons as well as from instrumental ground truths of tree crowns. Measurable spectral reflectance intensity differences are observed in the leaves of healthy and diseased trees, especially at wavelengths of 500 to 600 nm and 700 to 800 nm. The overall accuracy of the method is found to be 89%.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Photogrammetric Engineering and Remote Sensing; 41; May 1975
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Nitrogen dioxide vapor penetration of chlorobutyl rubber SCAPE under operational conditions (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Operational self contained atmospheric protective ensembles (SCAPE suits) and fabric from the suits were subjected to a series of tests designed to determine the amount of exposure a wearer of the suit would receive if a spill of the hypergolic oxidizer nitrogen tetroxide (N2O4) should occur nearby. The results of these tests show that a wearer of a "stock" SCAPE suit equipped with a standard liquid air pack, if exposed to a spill resulting in a 26 percent increase of oxidizer in the surrounding atmosphere, will experiment no detectable concentration of nitrogen dioxide (NO2) inside the suit for 15 minutes. Thereafter, the NO2 concentration within the suit will increase for 35 minutes at a rate of 0.07 ppm per minute and then at a gradually decreasing rate until an equilibrium concentration of 3.4 ppm is attained after 100 minutes. Momentary increases of as much as 1.6 ppm can be expected if the wearer were to rise quickly from a squatting position, but the additional NO2 would be dissipated within three minutes. The effect of liquid and vapor N2O4 and of liquid monomethylhydrazine on permeation rates and tensile strength of the SCAPE suit fabric was also investigated.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-TP-1605
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Trace organic impurities in gaseous helium (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A program to determine trace organic impurities present in helium has been initiated. The impurities were concentrated in a cryogenic trap to permit detection and identification by a gas chromatographic-mass spectrometric technique. Gaseous helium (GHe) exhibited 63 GC flame ionization response peaks. Relative GC peak heights and identifications of 25 major impurities by their mass spectra are given. As an aid to further investigation, identities are proposed for 16 other components, and their mass spectra are given.
    Keywords: CHEMISTRY
    Type: NASA-TN-D-6520
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Analysis of surface tris (2,3-dibromopropyl) phosphate on chlorobutyl rubber SCAPE suits (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Tris (2,30-dibromopropyl) phosphate was used to confer flame retardant properties on butyl rubber formulations used in protective clothing such as the self-contained atmospheric protective ensembles (SCAPE suits) worn at Kennedy Space Center in support of Apollo, Skylab, and Apollo-Soyuz missions since 1966. Because tris (2,3-dibromopropyl) phosphate is mutagenic, surface concentrations of the compound in SCAPE suits were investigated as were as potential methods of removing or isolating it. Analytical procedures for determining surface concentrations of the tris compound on non-porous materials are described. Soap-and-water washing is the most efficient method of removing the compound from fabricated SCAPE suits and unused material.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-79731 , MAS-7100
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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