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  • correlation analysis  (2)
  • thermal decomposition  (2)
  • DAE systems  (1)
  • Forest  (1)
  • Springer  (6)
  • 2000-2004  (6)
  • 2000  (6)
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Keywords
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  • Springer  (6)
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  • 2000-2004  (6)
Year
  • 2000  (6)
  • 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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  • 4
    Electronic Resource
    Electronic Resource
    Predicting the Free Energies of Complexation Between Cyclodextrins and Guest Molecules: Linear versus Nonlinear Models (2000)
    Springer
    Pharmaceutical research 17 (2000), S. 358-365 
    Details
    ISSN: 1573-904X
    Keywords: QSPR, Quantitative Structure-Property Relationship ; correlation analysis ; regression models ; molecular modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. In the present paper, linear and nonlinear models forcomplexation of α- β- and γ-cyclodextrin with guest molecules are developed,with the aim of free energy prediction and interpretation of theassociation process. Methods. Linear and nonlinear regression is used to correlateexperimental free energies of complexation with calculated moleculardescriptors. Molecular modeling supports the interpretation of the results. Results. Highly predictive models are obtained, although the structuralvariability of the compounds used for their deduction is large, reachingfrom synthetic heterocycles to steroids and prostaglandins. Conclusions. The scaled regression coefficients give insight to thecomplexation mechanisms, which appear to be different for the threetypes of cyclodextrins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007565409407
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  • 5
    Electronic Resource
    Electronic Resource
    A Method for Predicting the Free Energies of Complexation between β-Cyclodextrin and Guest Molecules (2000)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 36 (2000), S. 409-423 
    Details
    ISSN: 1573-1111
    Keywords: host-guest systems ; linear regression ; molecular descriptors ; statistical models ; correlation analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In the present work, linear regression models for theprediction of the free energies of complexationbetween guest molecules and β-cyclodextrin arededuced. For 70 compounds (mostly pharmaca), theexperimentally determined 1 : 1 stability constants aretransformed into the respective free energies, whichare then correlated with molecular descriptors. The statistically significant descriptors, which leadto models with remarkable predictive power, indicatethat besides volume, shape and lipophilicity, whichhave the largest contribution to the complexationenergy, complexation is also significantly influencedby the flexibility and the hydrogen bonding capacityof the guest molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008063412529
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  • 6
    Electronic Resource
    Electronic Resource
    Force Coupling Versus Differential Algebraic Description of Constrained Multibody Systems (2000)
    Springer
    Multibody system dynamics 4 (2000), S. 317-340 
    Details
    ISSN: 1573-272X
    Keywords: multibody systems ; DAE systems ; force coupling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The force coupling and the differential algebraic descriptionof constrained multibody systems are compared and applied to two testmodels used in vehicle dynamics. Based on the Newtonian and Eulerianequations the equations of motion for local subsystems are presentedusing explicitly and implicitly formulated constraints. In the nextstage the coupling of local subsystems using implicit algebraicconstraints and an approximative description of the constraints byapplied coupling forces is explained. The two coupling methods areapplied to test models used in vehicle dynamics to examine theircharacteristics by numerical integration with different methods. Themost efficient among the tested DAE solvers is identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009864502590
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