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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 343-347 
    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: Schutzwirkung von zwei Dampfphaseninhibitoren bei der Korrosion von StahlUntersucht wurde die Wirkung von zwei Dampfphaseninhibito-ren (Dicyclohexylammoniumnitrit (DICHAN) und Dicyclohexyl-amin (DICHAMIN)) bei der Korrosion von Stahl an der Atmosphäre (100% RF) unter isothermen Bedingungen (25 °C). Um an dünnen adsorbierten Feuchtigkeitsschichten elektrochemische Daten zu erhalten, wurde ein Dampfphaseninhibitor-Monitor entwickelt. Die Meßdaten wurden mit Hilfe von drei elektrochemischen Methoden und mittels Bildanalyse überprüft. Die Versuchsergebnisse zeigen, daß die Korrosion von Stahl durch die beiden Verbindungen gehemmt wird. Der verwendete Monitor in Verbindung mit den elektrochemischen Techniken ermöglicht die Deutung des Inhibierungsmechanismus.
    Notes: The action of two vapour phase inhibitors (VPI), dicyclohexyl-ammonium nitrite (DICHAN) and dicyclohexylamine (DICHAMIN), on the atmospheric corrosion of mild steel at a relative humidity of 100% and under isothermal conditions (25 °C) has been studied. In order to obtain electrochemical data with thin adsorbed moisture layers a vapour phase inhibitor monitor (VPIM) was developed. A check of the data was done by three electrochemical techniques and by the image analysis technique. The tests carried out have revealed that the corrosion rate of mild steel decreases in the presence of DICHAN and DICHAMIN. With the VPIM and the electrochemical techniques used it is possible to understand the inhibition mechanism of these two vapour inhibitors on the atmospheric corrosion of steel.
    Additional Material: 8 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 46 (1995), S. 515-519 
    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: Korrosion von Bronze durch Essig- und Ameisensäuredämpfe, Schwefeldioxyd und NatriumchloridpartikelVorliegende Arbeit behandelt die Korrosion von Bronze mit und ohne künstlicher Patina durch Essig- und Ameisensäuredämpfe, Schwefeldioxyd und Natriumchlorid bei relativer Luftfeuchtigkeit von 100%. Die eingesetzten Verfahren waren Gravimetrie, Röntgenstrahlenbeugungsanalyse, Infrarotanalyse und Rasterelektronenmikroskopie. Wie Schwefeldioxyd und Natriumchlorid erzeugen auch Essig- und Ameisensäuredämpfe auf Bronze eine starke Korrosion. Die wichtigsten identifizierten Bestandteile sind Cuprit, Kupferschwefel, hydratisiertes Kupfersulfat, Kupferazetat und Kupferformiat.
    Notes: This paper studies the corrosion of patinated and unpatinated bronze by acetic and formic acid vapours, sulphur dioxide and sodium chloride salt particles, at 100% relative humidity. Weight loss, X-ray diffraction, infrared and scanning electron microscopy were the techniques used. Acetic and formic acid vapours, sulphur dioxide and sodium chloride produce a high corrosion rate on bronze. In general, no protective effect was found by the patina on bronze. The principal compounds identified were Cu2O, Cu2S, Cu5(SO4)2(OH)6 · 5H2O, Cu(CH3CO2)2 · XH2O and Cu(HCO2)2.
    Additional Material: 4 Ill.
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  • 3
    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 Resultate von Untersuchungen über die chemische Wechselwirkung zwischen einigen monofunktionellen Modellverbindungen, die die Struktur und Reaktivität von wärmehärtbaren Phenol- und Harnstoff-Formaldehyd-Harzen simulieren, mit Holzkomponenten (Hemicellulosen, Cellulose und Lignin) werden dargelegt. Während Hemicellulosen deutlich dazu neigen, Kondensationsprodukte mit diesen Modellverbindungen zu ergeben, reagieren Lignine in manchen Fällen weniger leicht und abhängig davon, durch welchen Prozeß sie gewonnen worden sind, und abhängig von der Art der Modellverbindung. Cellulose reagierte wegen ihrer Kristallinität nicht unter den gegebenen Bedingungen.
    Notes: Results are presented on the chemical interactions occurring when some monofunctional model compounds simulating the structure and reactivity of thermosetting phenol- and urea-formaldehyde resins are mixed with wood components (hemicelluloses, cellulose, and lignins). Whereas hemicelluloses clearly show a propensity to give condensation products with these model compounds, lignins can react less readily in some instances depending on the delignification procedure used to isolate them and on the type of model compound. Cellulose did not react under the conditions chosen, mostly because of its crystalline character.
    Additional Material: 9 Ill.
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  • 4
    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: The chloromethylated polystyrenes bearing tetrathiafulvalenylcarbonyloxymethyl groups can be oxidized. We have shown that ion radical salts are obtained from these polymers and carbon tetrabromide after irradiation with UV light. Charge transfer complexes were prepared by mixing these polymers and 2,3-dichloro-5,6-dicyanobenzoquinone. The possible presence of sulfoxides as a result of oxidation of some tetrathiafulvalene units could explain the difficulties we have observed to filter solutions of these polymers.
    Notes: Les polystyrènes chlorométhylés renfermant des radicaux tétrathiafulvalénylcarbonyloxyméthyles peuvent être oxydés. Ainsi la formation de sels d'ions radicaux obtenus à partir de ces polymères et de tétrabromure de carbone, irradiés sous UV, a été mise en évidence. Des complexes de transfert de charge ont été préparés en mettant en présence ces polymères et de la 2,3-dichloro-5,6-dicyanobenzoquinone. La présence de sulfoxydes non décelés et résultant de l'oxydation de certaines unités de tetrathiafulvalène contenus dans ces polymères pourrait expliquer les problèmes rencontrés lors de la filtration de leurs solutions.
    Additional Material: 4 Ill.
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  • 5
    ISSN: 1040-0397
    Keywords: Testosterone thiosemicarbazone ; Immunology ; Adsorptive stripping voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electroanalytical behavior of testosterone thiosemicarbazone (TT) has been investigated by linear sweep and differential pulse voltammetry with and without adsorptive preconcentration on a hanging mercury drop electrode (HMDE). The adsorptive stripping response has been evaluated with respect to preconcentration time and potential, drop size, scan rate, and other variables. Measurement of a selected reduction wave enables the determination of TT in the μg L-1 range, with a detection limit of 100 ng L-1 (10 min preconcentration time). The determination can also be carried out in a urine/aqueous NaClO4 (2/8) medium. The immunological interaction of TT with the testosterone specific antibody can be electrochemically monitored via the decrease in the reduction wave, as described previously. This property is discussed as a tool for the determination of testosterone and its specific antibody by competitive immunoassay with amperometric detection in real matrices such as urine.
    Additional Material: 7 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 345-354 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The solution behavior of polyglucoses prepared by the acid catalyzed polycondensation of Pacsu and Mora is discussed. According to this method glucose enters the polycondensation through the hemiacetal hydroxyl joining any of the other hydroxyls of a second glucose unit. Branching occurs up to the functionality of glucose but infinite network is not formed since the branching probability can only approach but never reach unity. The resulting polyglucose is a highly branched spherical molecule, readily soluble in water. Each polyglucose molecule contains one unreacted glucosidic hydroxyl in accordance with the suggested polycondensation scheme, as the agreement between osmotic and reducing end group number-average molecular weights indicate. The intrinsic viscosity is very low ([η] = 0.08 at Mw 100,000) and increases only slightly with the weight-average molecular weight, suggesting that the molecule is highly branched: a double logarithmic plot of [η] against Mw has a downward curvature and does not follow the straight line with a slope of 0.50, valid for linear molecules. Periodate oxidation data indicate that fractionation occurs not only by molecular weight but also by the extent of branching, and the lower molecular weight products appear to have relatively less branching.
    Additional Material: 1 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 65 (1997), S. 867-875 
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Structural parameters and energy have been calculated for C1-3 and C9 clusters using density functional theory through the deMon program. The C1-3 clusters were fully optimized using deMon; different basis sets were tested in order to choose the suitable one to be used in the C9 clusters. In the case of C2 the results were compared with experimental values. DZVP2 basis was selected because it always gave the closest value to the experimental data. The C9 carbon clusters were designed in relation to C(100) diamond surface. The energies of the nonrelaxed and relaxed surfaces with and without hydrogen were calculated. In the same way CH3-relaxed and CH2-relaxed species were calculated. The diamond growth mechanism proposed in the literature was evaluated by an energy analysis. The C(SINGLE BOND)CH3 distance is reported.   © 1997 John Wiley & Sons, Inc. Int J Quant Chem 65: 867-875, 1997
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Mass Spectrometry Reviews 11 (1992), S. 431-443 
    ISSN: 0277-7037
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 6 (1992), S. 507-512 
    ISSN: 0268-2605
    Keywords: Tributyltin ; Fiji ; sediments ; shellfish ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tri(n-butyl)tin (TBT) concentrations were determined in sediments and selected shellfish from Suva Harbour, Fiji. Sediments in the immediate vicinity of foreshore slipways and boatyards were exceedingly contaminated, with a maximum observed level of 38μ g-1 TBT-Sn. Concentrations were much lower in surficial sediments from commercial docks and yacht mooring areas, namely 16-83 ng g-1 TBT-Sn. Mangrove oysters (Crassostrea mordax), gastropods (Thais mancinella), and bivalves (Anadara scapha) were found to have accumulated TBT. Concentrations as high as 3180 ng g-1 TBT-Sn were found in mangrove oysters. With respect to the mangrove oyster, its widespread distribution, abundance and proclivity to accumulate TBT suggest that it is likely to be the best bioindicator species of TBT contamination in Fijian coastal waters.
    Additional Material: 1 Ill.
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  • 10
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to conserve high contrast while improving the sensitivity of microlithographic resins made up of polystyrene bearing tetrathiafulvalene (TTF) units, we prepared new polystyrenes containing tetrathiafulvalenylcarbonyloxymethyl groups which are methylated or non-methylated. The polymers were synthesized by reaction of poly[styrene-co-(p-chloromethyl-styrene)] with the corresponding caesium tetrathiafulvalenecarboxylate. To optimize this grafting reaction, preliminary reactions were carried out with model molecules.
    Additional Material: 3 Ill.
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