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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 41-43 
    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: Progress in the Manufacture of Acidresistant StonewareOne of the distinguishing features of stoneware is its resistance to chemical action and its outstanding mechanical properties. These qualities permitted the development of stoneware to keep pace with that of the chemical industry.The article describes further progress in the field of acid-resistant stoneware. Particular emphasis is laid on the development of special mixtures having great powers of resistance to temperature changes, at the same time retaining their excellent heat-conducting properties. Improvements in the mechanical working of stoneware are also discussed.The mechanical working of stoneware by grinding, polishing and threading has been brought to the point where the accuracy and finish of the work is equivalent to that obtaining in metal working practice. A new field of application of stoneware was thereby opened. The production of air and dust locks for use in installation working with ultrafine abrasive dust particles is an example. Stoneware rollers having precision ground surfaces are used in various industries. Ground, polished and threaded stoneware components enable many improvements and simplifications to be made in the design of machinery and equipment for the chemical industry.
    Notes: Kennzeichnend für den Werkstoff Steinzeug sind seine Beständigkeit gegenüber chemischer Korrosion und seine ausgezeichneten mechanischen Eigenschaften. Beides waren die Voraussetzungen, um mit der Entwicklung der chemischen Großindustrie Schritt halten zu können.In der Abhandlung werden weitere Fortschritte auf dem Gebiet des säurefesten Steinzeug besprochen. Diese werden besonders deutlich durch Entwicklung von temperaturwechselbeständigen und wärmeleitfähigen Spezialmassen und durch Verbesserung der Nachbearbeitungsmethoden.Die mechanische Bearbeitung von Steinzeug durch Schleifen, Polieren und Gewindeschneiden wurde so weit entwickelt, daß eine Vergütung und Maßgenauigkeit möglich ist, wie in der Metallindustrie. Dadurch wurden dem Steinzeug neue Anwendungsmöglichkeiten erschlossen. Beispielsweise werden Staubschleusen zur Förderung von feinsten aggressiven Staubteilchen hergestellt. Steinzeugwalzen mit präzisem Schliff der Oberfläche finden in verschiedenen Industriezweigen Verwendung. Geschliffene, polierte und mit Gewinde versehene Steinzeugteile brachten Vereinfachungen und Verbesserungen im Steinzeugmaschinen- und Apparatebau.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 977-978 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dielectric dispersion measurements with aqueous solutions of hemoglobin and myoglobin have been performed in the frequency range from 100 kcps to 15 Mcps. The influence of preparation, particle size, and solvent conditions was studied. The results are analyzed in terms of an orientational polarization mechanism.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complex dielectric constant of aqueous hemoglobin solution was measured at 9.5 GHz. A microwave technique allowing phase and attenuation settings with an accuracy of 0.3° and 0.03 db was used. The shift of the relaxation wavelength and the hydration values of horse hemoglobin were determined for native and lyophilized hemoglobin solution and erythrocytes suspensions as well. The isotope effect of light and heavy water on these parameters was detected. The influence of buffers was studied. Relative measurements, with the sensitivity increased by a factor of 20, were made with alternating oxygenated and deoxygenated human hemoglobin solutions. The oxygenation of hemoglobin was found to leave the hydrated molecule volume invariant within ±250 Å3, while a shift of the relaxation wavelength of 0.0025 ± 0.0015 cm occurs for a hemoglobin concentration of 107 g/l. The results are discussed in terms of the structure and function interrelationship of hemoglobin and the current picture of water structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 388 (1972), S. 113-124 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A lot of nickel and copper complexes of Schiff bases were prepared and investigated for their solubility behaviour. Amine components and aldehyde components used see „Inhaltsübersicht„.As far as investigated, the solubility of those compounds containing 4. and 5. is poor in most solvents, but it is better in pyridine. N.N′-pentamethylene-bis(salicylideneiminato)-nickel(II) is trimeric in pyridine. The copper and nickel salts containing the bulky amines 7.,8. and 9. are oligomeric (n = 2 to n = 5) in bromoform and pyridine. The salts containing 11. are monomeric in pyridine. With Stuart models it is possible to construct dimers containing 7. and 9. as amine components having square planar configuration around the metal atom. With strongly distorted tetrahedral configuration it is possible to obtain monomers. With 17., completely insoluble high polymeric compounds were obtained, whereas with 12. oligomers are found.
    Notes: Es wurde eine große Anzahl von Ni- und Cu-Komplexen mit Schiffschen Basen dargestellt und auf ihr Lösungsverhalten untersucht. Als Aminkomponenten dienten: 1. bis 5. H2N · (CH2)xNH2 mit x = 2 bis 6, 6. 1,8-Diaminonaphthalin, 7. 1-Amino-3-aminomethyl-3,5,5-trimethylcyclohexan, 8. 1,4-Bis-(aminomethyl)-cyclohexan, 9. 1,6-Diamino-2,4,4-trimethylhexan, 10. 1,5-Diamino-diäthylen-amin, 11. 1,7-Diamino-dipropylen-amin und 12. 4,4′-Diamino-diphenyl-methan, -amin, -sulfid und -äther. Als Aldehydkomponenten wurden verwendet: 13. Salicylaldehyd, 14. 5-Brom-Salicylaldehyd, 15. β-Resorcylaldehyd, 16. 2-Hydroxy-naphthaldehyd und 17. 5,5′-Methylen-bis-(Salicylaldehyd).Soweit untersucht, ist die Löslichkeit der Verbindungen mit 4. und 5. meist schlecht, in Pyridin aber besser. Bis-(Salicylaldehyd)-Ni(II)-1,5-diimino-pentan ist in Pyridin trimer. Die Cu- und Ni-Salze mit den sperrigen Diaminen 7., 8. und 9. sind in Bromoform und Pyridin oligomer (2 bis 5), mit 11. wird in Pyridin das Monomere gefunden. Mit Stuart-Kalotten lassen sich Dimere mit 7. und 9. als Aminkomponente bei planquadratischer Konfiguration um das Metallatom aufbauen, bei stark tetraederförmig verzerrter Konfiguration sind sogar bei 7. Monomere möglich. 17. führt stets zu völlig unlöslichen hochpolymeren Verbindungen, wohingegen 12. häufig zu oligomer löslichen Komplexen führt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 617-618 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 78 (1966), S. 595-596 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 21 (1888), S. 1746-1753 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 4 (1871), S. 825-827 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 6 (1873), S. 88-92 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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