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  • Electronic Resource  (10)
  • 1980-1984  (10)
Material
  • Electronic Resource  (10)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (1984), S. 2145-2152 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A heat flow model is presented of the solidification process of a thin melt layer on a heat conducting substrate. The model is based on the two-dimensional heat conduction equation, which was solved numerically. The effect of coexisting regions of good and bad thermal contact between foil and substrate is considered. The numerical results for thermal parameters of the Al-Cu eutectic alloy show considerable deviations from one-dimensional solidification models. Except for drastic differences in the magnitude of the solidification rate near the foil-substrate interface, the solidification direction deviates from being perpendicular to the substrate and large lateral temperature gradients occur. Interruption of the thermal contact may lead to back-melting effects. A new quantity, the effective diffusion length, is introduced which allows some conclusions to be drawn concerning the behaviour of the frozen microstructure during subsequent cooling.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 1793-1795 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 1118-1120 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 8 (1982), S. 527-534 
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Results are described of TSD- and TSP-measurements of Poly (Phenylquinoxaline) in dependence on the degree of annealing and on the polarizing field strength. Seven relaxations regions are investigated and discussed. Electronic and ionic space charge regions are observed and discussed in detail. It is shown that dielectric losses in polymers do not result from dipolar processes only, but also from translational motion of charge carriers.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 310 (1983), S. 65-73 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Medium and high spin states in145Gd up to 3.5 MeV excitation energy have been studied by in-beam gamma ray and conversion electron spectroscopy bombarding enriched144Sm target with a3He beam. For a part of the identified levels a configuration is proposed in terms of weak coupling of one neutron hole with the146Gd core or of one neutron particle with the144Gd core.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectral flux density of negative muons has been measured down to 5 eV.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 315 (1983), S. 448-453 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit der kontinuierlichen trägerfreien Durchflußisotachophorese gelingt die präparative Gewinnung von sechs einkernigen kationischen Rutheniumnitrosylnitrato-Komplexen. Die Reinheitskontrolle geschieht durch Capillarisotachophorese.
    Notes: Summary Continuous carrier-free free-flow isotachophoresis permits the preparative isolation of six mononuclear cationic ruthenium nitrosyl nitrato complexes. The purity of the complexes is controlled by capillary isotachophoresis.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 38-46 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Lösungen von Rutheniumnitrosylnitro-, Rutheniumnitrosylnitronitrato- und Rutheniumnitrosylnitrato-Komplexen lassen sich mit Hilfe von Papierelektrophorese, Extraktions-Chromatographie und Extraktionen eindeutig voneinander unterscheiden. Kontaktzeit, HNO3-Konzentration, NO 3 − -Konzentration, HDBP-Gehalt der organischen Phase und Zusatz von F−, SO 4 2− , H2PO 4 − und C2O 4 2− beeinflussen stark die Extraktion der Rutheniumnitrosylnitrato-Komplexe mit TBP in Dodecan.
    Notes: Summary Solutions of ruthenium-nitrosyl-nitro, ruthenium-nitrosyl-nitro-nitrato and ruthenium-nitrosyl-nitrato complexes can be distinguished clearly from each other by means of paper electrophoresis, extraction chromatography and extractions. The contact time, HNO3-concentration, NO 3 − -concentration, HDBP-content of the organic phase and the addition of F−, SO 4 2− , H2PO 4 − and C2O 4 2− exert a strong influence on the extraction of the ruthenium-nitrosyl-nitrato complexes with TBP in dodecane.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 344-352 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The differentiation of electron and ion charge carriers is of principal importance for explaining the electrical properties of high polymer solids. Experimental methods enabling differentiation between electron and ion charge carrier transport are summarized and estimated, particularly mass transport (mass spectroscopy, neutron activation analysis and tracer technique) as direct methods as well as “internal” electrical effects (d.c. characteristics and dielectric measurements) and “external” electrical effects (electrochemical cell, electrode conditions, pressure dependence of conductivity, photoelectric effects) as indirect methods. The results obtained with various high-ohmic polymer solids are summarized and discussed.
    Notes: für die Interpretation der elektrischen Eigenschaften polymerer Festkörper ist die Frage nach der elektronischen oder ionischen Natur der Ladungsträger von grundsätzlicher Bedeutung. Es werden experimentelle Methoden zusammengestellt und bewertet, die eine Unterscheidung zwischen einem elektronischen und einem ionischen Transport zulassen. Insbesondere sind dies die folgenden Methoden: Massetransport (Massenspektroskopie, Neutronenaktivie-rungsanalyse und Tracer-Technik) als direkte Verfahren und als indirekte Methoden die „inneren“ elektrischen Effekte (Gleichstrom-Charakteristika und dielektrische Messungen) und die „äßeren“ elektrischen Effekte (elektrochemische Zelle, Elektrodenbedingungen, Druckabhängigkeit des Leitwertes, photoelektrische Effekte). Die erhaltenen Ergebnisse werden für eine Reihe hochohmiger Polymerfestkörper zusammengestellt und diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 767-770 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: TSD-spectra are measured after thermal and optical excitation at several values of polarizing field strength and intensity of light. An α-relaxation region is not evident by optical excitation. The β-relaxation region is observable, but it is superimposed by another relaxation region for greater polarizing field strength. By optical excitation further maxima are observed at temperatures higher than the temperature of the β-relaxation. They are interpreted by a trap mechanism. An identical space charge maximum exists for both the excitation processes.
    Notes: TSD-Spektren wurden nach thermischer und optischer Anregung bei verschiedenen Werten von Polarisationsfeldstärke und Quantenflußdichte gemessen und miteinander verglichen. Bei optischer Anregung ist keine α-Relaxation nachweisbar, das β-Relaxationsgebiet dagegen tritt auf, wird aber insbesondere bei höheren Polarisationsfeldstärken von einem weiteren Relaxationsgebiet teilweise überlagert. An das β-Relaxationsgebiet schließen bei optischer Anregung zu höheren Temperaturen hin Maxima an, die durch Haftstellenmechanismen interpretiert werden. Bei beiden Anregungsarten existiert ein identisches Raumladungsmaximum.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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