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  • 1
    Unknown
    Dordrecht : Springer
    Keywords: Chemistry ; Chemistry, Physical organic ; Chemistry, inorganic ; Mechanics, applied ; Molecular structure ; Quantum theory
    ISBN: 9781402036880
    Language: English
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  • 2
    Unknown
    Dordrecht : Springer
    Keywords: Biology ; Data processing ; Biomedical engineering ; Chemistry
    ISBN: 9781402035876
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 39 (1993), S. 322-334 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A Model is developed to predict the coalescence behavior in liquid-liquid dispersions. Coalescence times are based on the lifetimes of the single films that are formed between adjoining drops in a creamed or sedimented dispersion. The model is developed for smaller drop sized dispersions (〈100 μm) in which the drops are not substantially deformed due to gravitational forces. The model predicts that coalescence occurs between the emulsion drops without the gross separation of the dispersed phase (that is, the dispersion does not separate into distinct oil and water phases). As a result of interdrop coalescence, the mean drop size of the dispersed phase increases along with an increase in the polydispersity of the drop size. The model's predictions are used to develop a quantitative relationship between the lifetime of the single film and the rate of increase of the mean drop size of the dispersion. The model also accounts for the effect on dispersion stability via the models of single film drainage in the presence of surfactant.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0947-3440
    Keywords: 1,6-Naphthyridines ; 4-Aminopyridin-3-carbaldehydes ; Cyclizations ; Nitrogen heterocycles ; Antituberculosis agents ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vilsmeier formylation of the 4-amino-2-pyridinones 4a-d leads to the formation of the corresponding 3-carbaldehydes 5a-d (the diformylated product 8 is isolated as a by-product). A cyclizing Knoevenagel reaction of 5 with CH-acidic nitriles 6 in the presence of piperidine gives substituted 2-imino-1,6(6H)-naphthyridin-5-ones 7a-p which have been shown by means of 1H-NMR and 1H-NOE measurements not to rearrange to 9. The products 7 are resistant against hydrolysis and only the ester group can be hydrolysed to an acid, 7q. Compounds 7c, d, f display in vitro antituberculosis activity.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 187-192 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Mechanismus der Inhibitionswirkung von α-Pyrophthalon bei der Korrosion von KupferDer Mechanismus der Inhibitionswirkung von α-(Pyridyl)-1,3-indandion (bekannt als α-Pyrophthalon) bei der Korrosion von Kupfer in neutralen wäßrigen Lösungen wurde durch XPS-Analysen der Oberfläche, Kapazitäts- und Polarisationsmessungen untersucht.Das α-Pyrophthalon verlangsamt sowohl die kathodischen als auch die anodischen Partialreaktionen. Die Kapazitätsmessungen zeigen Adsorption der Inhibitormoleküle auf der Kupferoberfläche bei Potentialen, die viel negativer als das Korrosionspotential sind.Durch XPS-Analysen der Oberfläche wurde festgestellt, daß die Inhibitionswirkung von α-Pyrophthalon auf den Korrosionsvorgang einer Cu(αPP)2-Komplexbildung an der Kupferoberfläche zu verdanken ist. Die Zusammensetzung und die Struktur des Inhibitionsfilms setzen einen komplexen Verlauf der Reaktionen der Kupferoxidbildung und der Bildung und Ablagerung des Cu(αPP)2-Komplexes an der Oberfläche voraus.
    Notes: The mechanism of the inhibiting action of α-(pyridyl)-1,3-indandione (known as α-pyrophthalone, αPP) in the corrosion of copper in nearly neutral solutions is studied by XPS analysis of the metal surface, capacitance and polarization measurements.α-Pyrophthalone decreases the rate of the cathodic as well as of the anodic partial reaction. The capacitance measurements show that the inhibitor's molecules adsorb on the copper surface at potential values more negative than that of the corrosion potential.According to the data of the XPS analysis the inhibiting action of α-pyrophthalone on the corrosion process is determined by the formation of a Cu(αPP)2-complex on the copper surface. The composition and the structure of the inhibiting film show a complex process of the formation and the precipitation of the Cu(αPP)2-complex on the surface.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 510-512 
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The Knudsen effusion mass spectrometric method was used to study the vaporization processes and thermodynamic properties of the GeO2·P2O5 system at 1423 K. GeO, PO2, P4O10, GePO3 and O2 molecules were identified in the gas phase above the GeO2·P2O5 system. A correlation was shown between the phase diagram and the thermodynamic properties attained in the GeO2·P2O5 system.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 1244-1251 
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The high-temperature mass spectrometric Knudsen effusion method has been used to study the vaporization processes and thermodynamic properties of the B2O3—Al2O3 system in the temperature range 1248-1850 K. Data on the B2O3 partial vapour pressures and the B2O3 activities in the system under consideration were obtained. The enthalpies of formation of Al4B2O9 and Al18B4O33 have been evaluated from the values of the enthalpies of B2O3 sublimation from boron oxide and from these compounds. Comparison is made between the available phase diagram of the B2O3—Al2O3 system and the results obtained in the present study, using the complete isothermal vaporization method.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The influence of light wavelength and intensity, as well as the temperature, on photooxidation has been studied for rubbers based on polydieneurethane (PDU) or polyetherurethane (PEU). Photooxidation is shown to proceed by the chain free-radical mechanism with bimolecular (for PDU) or linear (for PEU) kinetic chain termination. The PDU oxidation kinetic parameter is equal to 0.02 [mole/(kg·s)]1/2 and does not depend on temperature. In PEU photooxidation the kinetic chain length is constant in a wide range of light intensities and is equal to 7, while the activation energy is ca 18 kJ/mole. In distinction to PEU, PDU is sensitive not only to UV but also to visible light, with this sensitivity being preserved up to high oxidation levels. The dependences of photooxidation quantum yieldes on wavelength and irradiation time have been determined.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The mechanism of synergism in mixtures of UV-absorbers and radicals scavengers of peroxide decomposers is considered. The synergism is explained by diffusion of the antioxidant from the bulk of the polymer protected by UV-absorber towards the surface layer where the photoreaction proceeds. It is also shown that it is possible to obtain the synergistic effects using additional stabilizing or nonstabilizing substances, which change the solubility of a given stabilizer and the mode of its distribution in polymeric matrix.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2643-2647 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensation of Ethyl Crotonate, 3-Methylcrotonate, and Isopropylidenemalonate with Aromatic AldehydesWith sodium amide in dimethylformamide ethyl crotonate and 3-methylcrotonate react with aromatic aldehydes to yield directly 5-aryl- and 5-aryl-3-methyl-2,4-pentadienoic acid (3), respectively. Under the same conditions the reaction of aromatic aldehydes with diethyl isopropylidenemalonate leads to 6-aryl-4-(2-arylvinyl)-2-oxo-5,6-dihydro-2H-pyran-3-carboxylic acids (6).
    Notes: Unter der Einwirkung von Natriumamid in Dimethylformamid entstehen aus den Äthylestern der Croton- und 3-Methylcrotonsäure und aromatischen Aldehyden direkt 5-Aryl- bzw. 5-Aryl-3-methyl-2,4-pentadiensäuren (3). Unter denselben Bedingungen führt die Umsetzung der aromatischen Aldehyde mit Isopropylidenmalonsäure-diäthylester zu 6-Aryl-4-(2-arylvinyl)-2-oxo-5,6-dihydro-2H-pyran-3-carbonsäuren (6).
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