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  • Polymer and Materials Science  (3)
  • fire propagation model (BEHAVE)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of atmospheric chemistry 25 (1996), S. 1-19 
    ISSN: 1573-0662
    Keywords: biomass burning ; diurnal estimation ; fire propagation model (BEHAVE) ; Central African Republic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Experimental studies and mesoscale modeling of atmospheric chemistry require a good knowledge of the sources of the atmospheric constituent, at a temporal scale of about one hour and at a spatial scale corresponding to the model grid. A combined remote sensing/modeling approach for the estimation of the diurnal distribution of the amount of biomass burning in Central African Republic (C.A.R.) savanna fires is proposed. The fire propagation model (BEHAVE) developed by Rothermel was adapted to the fuel characteristics encountered in C.A.R. Ground and airborne measurements with satellite images (NOAA/AVHRR) were used to predict an accurate estimate of the burnt biomass. This combination allows the calculation of the distribution of the number of fires during the day providing an evaluation of the instantaneous fluxes of the compounds emitted in the atmosphere by these fires.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die radikalische Copolymerisation von Methylmethacrylat (MMA) und Allylmethacrylat (AMA) wurde studiert. Die Reaktionen wurden mit Azoisobutyronitril (AIBN) in Anwesenheit von ZnCl2 initiiert. Mit zunehmender ZnCl2-Konzentration nimmt die Copolymerisationsgeschwindigkeit zu, und die Copolymerisationsparameter bleiben nicht konstant. MMA und AMA bilden EDA-Komplexe mit ZnCl2. Diese Komplexbildung erklärt unsere Ergebnisse.
    Notes: Radical copolymerization of methyl methacrylate (MMA)-allyl methacrylate (AMA) in the presence of zinc chloride, using azoisobutyronitrile (AIBN) as initiator has been carried out. The copolymerization rate increases with the concentration of ZnCl2 and the reactivity ratios are modified by the concentration of ZnCl2 which is explained by the different tendency towards the formation of complexes between MMA and AMA with ZnCl2.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 19 (1971), S. 121-134 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Verschiedene copolymere Anhydridimide wurden aus Dicarbonsäuren mit vorgebildeter Imidgruppe erhalten. Dazu wurde zunächst Trimellitsäureanhydrid mit verschiedenen aromatischen und aliphatischen Aminen zu den entsprechenden Dicarbonsäuren mit Imidgruppen umgesetzt. Dann wurden aus diesen Dicarbonsäuren durch Reaktion mit Essigsäureanhydrid die entsprechenden gemischten Anhydride hergestellt. Unter bestimmten Bedingungen wurden daraus dann unter Abspaltung von Essigsäureanhydrid polymere Anhydride gewonnen.Die Polymeren sind kristallin und zeigen hohe thermische Stabilität und gute elektrische Eigenschaften. Ihre Struktur wurde IR-spektroskopisch und durch Elementaranalyse bestimmt; Beziehungen zwischen Struktur und Eigenschaften wurden untersucht.
    Notes: Various copolyanhydride-imides have been obtained from diacids containing the preformed imide group by directly reacting of trimellitic anhydride with various aromatic and aliphatic amines. The polymerization process took place in several stages. In the first stage the diacetyl derivatives were obtained from the corresponding diacids by reactions with acetic anhydride. Under special temperature and pressure conditions, polymers were obtained from these derivatives and the chain grew by developing acetic anhydride between contiguous molecules.The polymers obtained are crystalline, have high thermal stability and good electrical properties. Their structures were determined by IR spectroscopy and elementary analysis and the relationships between their properties and the polymer structures were investigated.
    Additional Material: 7 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 21 (1972), S. 65-77 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Reihe vollständig geordneter Copolyamide-imide und Copolyester-imide wurde durch Reaktion von aliphatischen oder aromatischen Diaminen mit symmetrischen Monomeren mit reaktiven Imidgruppen erhalten.Die aromatischen Diimidamid- und Diimidester-Monomeren wurden dazu durch Acidolyse zwischen Trimellitsäureimid und Essigsäurederivaten von aromatischen Diaminen und Diphenolen hergestellt.Die Diimidester-Monomeren mit aliphatischen Substituenten wurden durch Umesterung von Glycolen mit Trimellitimid-methylester erhalten.Die Polykondensationen wurden in polaren Lösungsmitteln durchgeführt; die isolierten Polymeren wurden im Hinblick auf einen Zusammenhang zwischen Struktur und Eigenschaften charakterisiert.
    Notes: A group of copolyamide-imides and copolyester-imides completely ordered has been obtained by the reaction of aliphatic and aromatic diamines with symmetrical monomers possessing reactive imide group.The aromatic diimide-amide and diimide-ester monomers were prepared by means of the reaction of acidolysis between trimellitic acid imide and acetoxy derivative of aromatic diamines and diphenols.The diimide-ester monomers with aliphatic substitutes were obtained by ester interchange between glycols and the methyl ester of trimellitimide.The polymerization reactions were carried out in a solution of polar solvents and the solated polymers were characterized with the object of estabilishing a relation between the properties and the structure of each one.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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