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  • 2000-2004  (14)
  • 1980-1984  (20)
  • 1950-1954  (11)
  • 1935-1939  (3)
  • 1930-1934  (4)
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  • 1
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 63 (1981), S. 247-252 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents Using numerical methods, the eddy current distribution is calculated in a conducting wedge induced by two exciting wires located symmetrical to the wedge. The complex equationsystem is solved by the relaxation-method of Gauß-Southwell and the solution is verified for the case of a conductiong semispace.
    Notes: Übersicht Für den Fall der symmetrisch zu einem leitenden Keil angeordneten, gegensinnig von sinusförmigem Wechselstrom durchflossenen Doppelleitung, wird mit Hilfe numerischer Methoden die Wirbelstromverteilung im Keil berechnet. Das entstehende komplexe Gleichungssystem wird nach dem Relaxationsverfahren von Gauß-Southwell gelöst und die Ergebnisse für den leitenden Halbraum kontrolliert.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 25 (1981), S. 95-103 
    ISSN: 1432-0630
    Keywords: 74.70.Dg ; 74.60.-w ; 73.60.Ka
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have studied the influence of oxygen on the superconducting properties of thin films of lead, indium and tin deposited on glass or sapphire substrates. In addition, the morphological microstructure was investigated by scanning electron microscopy. The film thickness was 1.0 μm, and the partial pressure of O2 during the film deposition was raised up to 1×10−4 Torr. In all three materials the development of a granular structure and a strong increase in the residual electric resistivity was observed due to the O2-treatment. Whereas in the Pb films no change of the critical temperature was found, the In films deposited on glass substrates showed a slight increase ofT c due to the oxygen. The strongest increase ofT c (up to 8%) was observed in the O2-treated Sn films. These results are discussed in terms of the McMillan theory. From our measurements of the critical current densityj c we conclude that edge pinning is dominant in the undoped films. All three materials showed a strong increase ofj c due to the O2-treatment which must be interpreted in terms of bulk pinning.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 61 (1932), S. 308-310 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung Es wird über sehr hochmolekulare Polyoxymethylene und deren Eigenschaften berichtet, besonders über ihre Elastizität und Plastizität. Diese Polyoxymethylene können in Form von Gläsern, Filmen und Fäden erhalten werden.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 507 (1983), S. 127-141 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dissociation Pressures and Phase Boundaries of Niobium NitridesDissociation pressures of niobium nitrides in the region NbN1.006-NbN0.45 were measured by a thermogravimetric method at temperatures from 1300 to 1800°C. The results enabled us to make statements on the two phase regions η/δ, δ/γ and δ/β and on the homogeneity ranges of the δ and the β phase. Enthalpies of the conversions η → δ, δ → γ, δ(γ) → β, and of the formation of the δ phase were calculated. A partial three dimensional c,p,T diagram and a proposal for a twodimensional c,T diagram of the Nb—N system have been designed.
    Notes: Durch Thermogravimetrie wurden die Zersetzungsdrücke von Niobnitriden im Gebiet NbN1,006 bis NbN0,45 bei Temperaturen zwischen 1300 und 1800°C ermittelt. Es resultieren Aussagen über die Zweiphasengebiete η-/δ-Phase, δ-/γ-Phase und δ-/β-Phase. Die Enthalpien der Umwandlungen η → δ, δ → γ, δ(γ) → β sowie der Bildung der δ-Phase aus den Elementen wurden berechnet. Es wurden ein dreidimensionales c,p, T-Teildiagramm konstruiert und ein Vorschlag für ein zweidimensionales c, T-Diagramm des Nb—N-Systems gemacht.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 512 (1984), S. 7-12 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Niobium Nitrides with Proposed Composition and StructureSpecial proposed niobium nitrides were prepared by using the predictions of the p, T, c diagram Nb—N recently known in most parts. This phase diagram thus could be confirmed.
    Notes: Durch Ausnutzung des in großen Teilen bekannten p, T, c-Diagramms der Nb—N-Verbindungen wurden gezielt bestimmte Niobnitridphasen dargestellt. Die analytische und röntgenographische Charakterisierung der Produkte wird mit dem Zustandsdiagramm verglichen und bestätigt dies weitgehend.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: N-Ethylaziridine (1) was polymerized in water with HCl as initiator and copolymerized with N-(2-hydroxyethyl)aziridine (2). Rapid propagation and termination reactions were observed. The maximum yield increases with the initiator concentration, whereas the molecular weight decreases. This is due to the difference in basicity between the tertiary N-atoms of the two monomers and the tertiary and the terminal secondary N-atoms of the polymers, which causes tranfer and termination reactions. Macrocycles with a side chain on a quaternary N-atom are formed. During the copolymerization, the more basic 1 is preferentially incorporated into the copolymer chain. The copolymerization parameters can be estimated roughly on the basis of basicity considerations: r1 〉 1; r2 〈 1. The ratio of the rate constants (propagation to termination) is lower for 1 than for 2. This is due to the fact that the basicity difference between the monomer and the tertiary N-atoms of the polymer is higher for 1 than for 2. By reaction of thionyl chloride with the copolymers the desired hydrochlorides of the N-(2-chloroethyl) derivatives are obtained. The neutralisation with alkali did not result the free bases, since the products formed are rather due to side reactions.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 63 (1951), S. 229-231 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: H. Staudinger, geboren am 23. März 1881 in Worms/Rh. feierte vor kurzem seinen 70. Geburtstag. Er habilitierte sich 1907 in Straßburg bei Thiele und wurde im gleichen Jahr a. o. Professor für organische Chemie an der Technischen Hochschule in Karlsruhe. 1912-1926 war er ordentlicher Professor für Chemie an der Eidgenössischen Technischen Hochschule in Zürich und ab 1926 in gleicher Eigenschaft an der Universität Freiburg/Br. H. Staudinger befaßte sich zuerst mit verschiedenen Stoffklassen und Problemen der organischen Chemie, insbesondere mit den von ihm entdeckten Ketenen. Seine Lebensarbeit widmete er aber der Chemie der Makromolekeln, die er vor mehr als 30 Jahren begründete und als deren markantester Vertreter er gilt. Etwa 500 Publikationen, davon allein etwa 100 über Cellulose, 60 über Kautschuk und Isopren, sind ein beredetes Zeugnis seiner unermüdlichen Schaffenskraft. Zahlreiche Ehrungen wurden ihm zuteil, von denen neben der Mitgliedschaft in vielen in- und ausländischen wissenschaftlichen Gesellschaften die Verleihung der Emil Fischer-Gedenkmünze des Vereins Deutscher Chemiker, der Leblanc-Gedenkmünze der französischen chemischen Gesellschaft, der Kautschukplakette, des Cannizzaro-Preises, der goldenen Ehrennadel des Vereins finnischer Chemiker und der Mitscherlich-Medaille genannt seien. H. Staudinger ist Ehrendoktor der Technischen Hochschule Karlsruhe und der Universität Mainz. Er gibt die von ihm begründete Zeitschrift „Die makromolekulare Chemie“ heraus.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 13 (1954), S. 210-222 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Different diacyl peroxides, hydroperoxides, dialkylperoxides and peracids are used as components of Fe··-redox-systems to polymerize styrene in benzene at 50° C. The conversions so obtained are compared with those of peroxide-induced polymerization. In cases of brominated peroxides one can calculate from the bromine-content of the polymers the incorporated catalyzer-fragments. No bromine can be found in the polymer if one uses brombenzoperacid; therefore if must be assumed, that the chain-initiation ensues through OH-radicals.
    Notes: Verschiedene Diacylperoxyde, Hydroperoxyde, Dialkylperoxyde und Persären werden als Komponenten von Eisen-Redox-Systemen zur Polymerisation von Styrol in Benzol bei 50° C benutzt. Die erzielten Umsätze werden mit denen bei peroxydischer Polymerisation verglichen. Bei bromhaltigen Peroxyden kann aus dem Bromgehalt der Polymeren auf die Zahl der eingebauten peroxydischen Bruchstücke geschlossen werden. Dabei Anwendung von Brombenzopersäre kein Brom in den Polymeren nachzuweiseu ist, muß angenommen werden, daß der Kettenstart durch OH-Radikale erfolgt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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