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  • 1
    Digitale Medien
    Digitale Medien
    Histogenesis and histochemistry of the digestive tract of chick embryos (1957)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 127 (1957), S. 677-695 
    Details
    ISSN: 0003-276X
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ar.1091270405
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  • 2
    Digitale Medien
    Digitale Medien
    Influence de la structure et de la longueur des chaines d'alcools sur les propriétés plastifiantes des phtalates correspondants (1974)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 38 (1974), S. 167-189 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Ausgehend von Alkoholen verschiedener Struktur und veränderlicher Kettenlänge wurde eine Serie von Phthalaten hergestellt. Ein Teil dieser Alkohole wurde durch selektive Hydroformylierung synthetisiert.Die für die Synthese dieser Alkohole gewählten Strukturparameter beziehen sich auf die Art der Verzweigung des Kohlenstoffskeletts: Einerseits die Länge und die Anzahl der Seitenketten, andererseits die Stellung dieser Ketten bezogen auf die Alkoholfunktion. Die Anzahl der Kohlenstoffatome der dargestellten Ketten variiert zwischen 6 und 13.Die physikalisch-chemischen Eigenschaften (spezifisches Volumen, Übergang in den Glaszustand, Viskosität) der aus diesen Alkoholen erhaltenen symmetrischen Diphthalate werden in Abhängigkeit von der Konfiguration der Ketten interpretiert.Das visko-elastische Verhalten des mit verschiedenen Mengen dieser Phthalate weichgemachten Polyvinylchlorids wurde im Übergangsgebiet beobachtet. Die thermisch-isochronen Veränderungen des Elastizitätsmoduls G(0) wurden in Abhängigkeit von der Struktur interpretiert und auf den Weichmachereffekt der Phthalate als Funktion der Verzweigung der Alkylketten zuriickgefuhrt.
    Notizen: A series of phthalates has been synthetised from primary alcohols with variable chain dimension and structure. The structural parameters of phthalates are those of alcohol chain: length of alkyl segment and branching factor i. e. the number, length and position of branches relatively to functional group. The number of carbon atoms in the alcohol skeleton varies from 6 to 13.The physico-chemical properties of phthalates (specific volume, glass transition, viscosity, and sol-gel transition) are interpreted in function of the chain configuration.The visco-elastic behaviour of plasticized PVC is examined for each phthalate in the glass transition range. The creep modulus has been measured by the conventional Clash and Berg method and correlated with structure and molecular weight of the alcohol chain.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1974.050380115
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  • 3
    Digitale Medien
    Digitale Medien
    Kinetic aspects of the copolymerization of tetrahydrofuran with alkylene oxides (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 3547-3554 
    Details
    ISSN: 0449-296X
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Cationic (BF3) copolymerizations and terpolymerizations of 1,2-butylene oxide (BO), propylene oxide (PO), and tetrahydrofuran (THF), have been carried out at 0°C in ethylene dichloride under dry inert conditions. Reactivity ratios of THF-BO, THF-PO and BO-PO systems have been determined with the use successively of 1,2-propanediol and 1,2,3-propanetriol (glycerine) as cocatalysts. Terpolymer compositions established experimentally compare well with those predicted by calculations with the reactivity rations determined in the binary systems. With the triol as cocatalyst, the existence of a ternary azeotrope was confirmed. Its composition is: M1(THF) = 0.125; M2(BO) = 0.205; and M2(PO) = 0.670.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1971.150091212
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  • 4
    Digitale Medien
    Digitale Medien
    Copolymerization of tetrahydrofuran with propylene oxide. III. 1,2,3-propanetriol as cocatalyst (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 10 (1972), S. 399-412 
    Details
    ISSN: 0449-296X
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The cationic copolymerization of tetrahydrofuran with propylene oxide was investigated with the use of boron trifluoride etherate, 1,2,3-propanetriol, and ethylene chloride as catalyst, cocatalyst, and solvent, respectively. The reactions were carried out in the liquid phase under a blanket of dry nitrogen at atmospheric pressure and in the temperature range from -10° to +20°C. Comonomer consumption was followed by vapor-phase chromatography, while the products were analyzed by gel-permeation chromatography, nuclear magnetic resonance, vapor-pressure osmometry, and chemical endgroup analysis (phthalation). The investigation was directed towards the elucidation of the influence of the initial cocatalyst content, the initial mole fraction of the comonomer, and the temperature of reaction, on the kinetics of the reaction (rates of disappearance of comonomers, reactivity ratios, comonomer conversions and product yields) and on the characteristics of the products formed (composition, molecular weight, and primary and secondary hydroxyl content). An attempt is made to interpret the results reported in the paper.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1972.150100207
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  • 5
    facet.materialart.
    Unbekannt
    Comparing ice and temperature simulations by four dynamic lake models in Harp Lake: past performance and future predictions (2014)
    Wiley-Blackwell
    Details
    Publikationsdatum: 2014-02-27
    Beschreibung: The physical dynamics of lake temperature and ice phenology are important in the modelling and management of temperate aquatic ecosystems. One-dimensional hydrothermal lake models have not been well evaluated in terms of how they simulate ice dynamics in particular. We chose four models (Hostetler, Minlake, Simple Ice Model or SIM, and General Lake Model or GLM) to test and compare their performance modelling water temperature and ice dynamics using 16 years of field data from Harp Lake, an extensively-studied inland lake in south-central Ontario. Each model produced satisfactory water temperature profiles over the simulated period, with small differences in the model performance. Model fits for ice phenology and ice thickness were, however, considerably lower than that for water temperature, with Minlake generating the best agreement with observed ice-on and ice-off dates as well as ice thickness, followed by SIM. The responses of lake ice dynamics to future climate scenarios were simulated by running each of the four models for 91 years, from 2010-2100. The predicted decrease in ice season length was significantly different among models, varying between 30 to 81 days, with an average of 48 days. Corresponding decreases in ice thickness varied between 0.11 to 0.20 m, averaging 0.17 m. This study demonstrates that uncertainty due to model performance and selection is considerable and further testing and refinement of hydrothermal lake dynamic models is needed to improve predictive abilities for ice dynamics. This article is protected by copyright. All rights reserved.
    Print ISSN: 0885-6087
    Digitale ISSN: 1099-1085
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie
    Publiziert von Wiley-Blackwell
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