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  • thermal decomposition  (2)
  • Europe  (1)
  • European Pollen Information  (1)
  • Forest  (1)
  • Grass Pollen seasons  (1)
  • Springer  (4)
  • 2000-2004  (4)
  • 2000  (4)
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  • Springer  (4)
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  • 2000-2004  (4)
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  • 2000  (4)
  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Key words Carbon decomposition ; Forest ; Pastures ; Topsoils ; Rondônia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003740050004
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): ergol ; monomethylhydrazine ; thermal decomposition ; vapour pressure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1012017308823
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): asymmetric dimethylhydrazine ; hydrazine monohydrate ; propellant ; thermal decomposition ; vapour pressure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1010154223757
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Temporal and geographical variations in grass pollen seasons in areas of west0ern Europe: an analysis of season dates at sites of the European pollen information system (2000)
    Springer
    Aerobiologia 16 (2000), S. 373-379 
    Details
    ISSN: 1573-3025
    Schlagwort(e): aerobiology ; airborne pollen ; Europe ; European Pollen Information ; Grass Pollen seasons ; Phenology ; start dates
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Geographical and temporal variations in the start dates of grass pollen seasons are described for selected sites of the European Pollen Information Service. Daily average grass pollen counts are derived from Network sites in Finland, the Netherlands, Denmark, United Kingdom, Austria, Italy and Spain, giving a broad longitudinal transect over Western Europe. The study is part of a larger project that also examines annual and regional variations in the severity, timing of the peak and duration of the grass pollen seasons. For several sites, data are available for over twenty years enabling long term trends to be discerned. The analyses show notable contrasts in the progression of the seasons annually with differing lag times occurring between southern and northern sites in various years depending on the weather conditions. The patterns identified provide some insight into geographical differences and temporal trends in the incidence of pollinosis. The paper discusses the main difficulties involved in this type of analysis and notes possibilities for using data from the European Pollen Information service to construct pan European predictive models for pollen seasons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026521331503
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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