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  • PHYSICAL SCIENCES  (2)
  • KMnO4 oxidation  (1)
  • 1995-1999  (1)
  • 1990-1994  (2)
  • 1955-1959
  • 1
    Electronic Resource
    Electronic Resource
    Changes in soil organic matter with cropping as measured by organic carbon fractions and 13C natural isotope abundance (1993)
    Springer
    Plant and soil 155-156 (1993), S. 399-402 
    Details
    ISSN: 1573-5036
    Keywords: carbon-13 ; cropping systems ; δ13C ; KMnO4 oxidation ; soil organic matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The decline in soil organic matter with cropping is a major factor affecting the sustainability of cropping systems. Changes in total C levels are relativelyinsensitive as a sustainability measure. Oxidation with different strength KMnO4 has been shown to be a more sensitive indicator of change. The relative size of soil C fractions oxidised by 333 mM KMnO4 declined with cropping, whilst the relative size of the unoxidised fraction increased. Changes in δ13C ratio have been used to measure C turnover in systems which include C3 and C4 species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025067
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Graphite-Fiber Heat Radiators (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Heat radiators of proposed type feature thermally conductive fibers protruding from metallic surfaces to provide increased heat-dissipation surface areas. Free of leaks and more reliable than radiators incorporating heat pipes. Also lightweight and relatively inexpensive. Radial graphite fibers carry heat away from spherical shell and radiate heat into space. Radiators prove useful on Earth in special industrial and scientific applications involving dissipation of heat in vacuum or in relatively still air.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-19298 , NASA Tech Briefs (ISSN 0145-319X); 19; 12; P. 57
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Manganese Nitride Sorption Joule-Thomson Refrigerator (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Proposed sorption refrigeration system of increased power efficiency combines MnxNy sorption refrigeration stage with systems described in "Regenerative Sorption Refrigerator" (NPO-17630). Measured pressure-vs-composition isotherms for reversible chemisorption of N2 in MnxNy suggest feasibility to incorporate MnxNy chemisorption stage in Joule-Thomson cryogenic system. Discovery represents first known reversible nitrogen chemisorption compression system. Has potential in nitrogen-isotope separation, nitrogen purification, or contamination-free nitrogen compression.
    Keywords: PHYSICAL SCIENCES
    Type: NPO-17811 , NASA Tech Briefs (ISSN 0145-319X); 16; 7; P. 58
    Format: text
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    NASA TECHNICAL REPORTS
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