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  • thermal decomposition  (2)
  • Forest  (1)
  • Springer  (3)
  • 2000-2004  (3)
  • 2000  (3)
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  • Springer  (3)
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  • 2000-2004  (3)
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  • 2000  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Carbon decomposition of the topsoils and soil fractions under forest and pasture in the western Brazilian Amazon basin, Rondônia (2000)
    Springer
    Biology and fertility of soils 30 (2000), S. 284-287 
    Details
    ISSN: 1432-0789
    Keywords: Key words Carbon decomposition ; Forest ; Pastures ; Topsoils ; Rondônia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The topsoils of two sites, comprising natural forest and 4- and 20-year-old pastures, respectively, were selected in Rondônia to evaluate the changes of soil organic matter due to pasture establishment. These changes were evaluated by measuring the proportions of the C and N associated with clay and silt fractions, and by the C decomposition (CD) rate of the whole topsoils and their size fractions. The topsoils studied had large proportions of C and N associated with fine fractions, especially with clay fractions. The CD rate of the silt fractions was higher than that of the clay fractions under the two forest topsoils and under the 20-year-old pasture. The CD rate of the silt fractions under forest vegetation at each site was significantly higher than that of the silt fractions under pasture vegetation at the same site. The CD of clay fractions followed the same trend as the silt fractions, showing an improvement in the stability of C associated with clay and silt fractions under pasture vegetation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050004
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  • 2
    Electronic Resource
    Electronic Resource
    Pression De Vapeur Et Decomposition Thermique De La Monomethylhydrazine (2000)
    Springer
    Journal of thermal analysis and calorimetry 62 (2000), S. 711-714 
    Details
    ISSN: 1572-8943
    Keywords: ergol ; monomethylhydrazine ; thermal decomposition ; vapour pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Monomethylhydrazine (MMH) (CH3)NHNH2 is currently used as fuel for spacecraft engine combustion chambers. The Aestus engine of the upper stage of Ariane 5 is fed with MMH under pressure of 16 bars. The propellant, initially at room temperature, is about 393 K when introduced into the combustion chamber, due to heating up through the regenerative circuit. As MMH is unstable above 373 K, it has been necessary to check its decomposition rate and vapor pressure under such conditions. The vapor pressure of this propellant has been measured in a pressure vessel and the thermal decomposition rate was determined with the same device up to 500 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012017308823
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  • 3
    Electronic Resource
    Electronic Resource
    Vaporisation dEcomposition thermique de dimethylhydrazine, d'hydrate d'hydrazine de leur melange UH25 (2000)
    Springer
    Journal of thermal analysis and calorimetry 63 (2000), S. 559-564 
    Details
    ISSN: 1572-8943
    Keywords: asymmetric dimethylhydrazine ; hydrazine monohydrate ; propellant ; thermal decomposition ; vapour pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Engine Viking of Ariane 4 is supplied with asymmetrical dimethylhydrazine (UDMH) (CH3)2NNH2. An addition of a small amount of hydrazine hydrate N2H4×H2O was proposed to increase the thermal stability of UDMH. The mixture where the mass ratio (CH3)2NNH2/N2H4×H2O is equals to 75/25, is called UH25. These propelling agents are unstable when they are heated and the optimisation of burning conditions requires a good knowledge of their vaporisation and of their thermal decomposition kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010154223757
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