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  • FABRICATION TECHNOLOGY  (1)
  • KMnO4 oxidation  (1)
  • 1995-1999
  • 1990-1994  (2)
  • 1975-1979
  • 1970-1974
  • 1950-1954
  • 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
    facet.materialart.
    Unknown
    Filament Winding Of Carbon/Carbon Structures (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Improved method of winding carbon filaments for carbon/carbon composite structures less costly and labor-intensive, also produces more consistent results. Involves use of roller squeegee to ensure filaments continuously wet with resin during winding. Also involves control of spacing and resin contents of plies to obtain strong bonds between carbon filaments and carbon matrices. Lends itself to full automation and involves use of filaments and matrix-precursor resins in their simplest forms, thereby reducing costs.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-18163 , NASA Tech Briefs (ISSN 0145-319X); 15; 10; P. 95
    Format: text
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    NASA TECHNICAL REPORTS
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