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  • 1985-1989  (7)
  • 1980-1984  (11)
  • 1970-1974  (5)
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  • 11
    Electronic Resource
    Electronic Resource
    Electrical polarization phenomena in poly (phenylquinoxaline) (PPQ) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 527-534 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00262931
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  • 12
    Electronic Resource
    Electronic Resource
    Excited states in145Gd from the (3He, 2n) reaction (1983)
    Springer
    The European physical journal 310 (1983), S. 65-73 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01433612
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  • 13
    Electronic Resource
    Electronic Resource
    The half-life of87Rb measured as difference between the isotopes87Rb and85Rb (1974)
    Springer
    The European physical journal 270 (1974), S. 121-127 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The half-lifeT of87Rb was determined by means of a 4π proportional counter using thin sources of RbCl on thin conducting backings. The total thicknessD investigated (RbCl+support) ranged from 11 to 525 μg/cm2. Comparative measurements with (inactive) layers of85RbCl showed that, in the energy range below 185 eV, RbCl layers give rise to spurious pulses. Linear extrapolation of the specific activity belowD=45 μg/cm2 toD=0 yieldsT=(4.88 −0.10 +0.06 )·1010 y. Previously published half-lives are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01677443
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  • 14
    Electronic Resource
    Electronic Resource
    Measurement of the spectral flux density of negative muons at very low energies (1982)
    Springer
    The European physical journal 304 (1982), S. 333-334 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01421514
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  • 15
    Electronic Resource
    Electronic Resource
    Heat flow model of rapid solidification with nonhomogeneous thermal contact (1984)
    Springer
    Journal of materials science 19 (1984), S. 2145-2152 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01058090
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  • 16
    Electronic Resource
    Electronic Resource
    Effect of ribbon-wheel contact on the microstructure of melt-spun Al-Cu eutectic alloy ribbons (1985)
    Springer
    Journal of materials science 20 (1985), S. 3141-3149 
    Details
    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 The microstructure of melt-spun Al-17.3 at% Cu eutectic alloy ribbons with different thicknesses have been revealed by means of electron microscopy and X-ray techniques. Thick ribbons (〉20μm) consist of finely-dispersed α-Al and Al2Cu equilibrium phases showing lamellar or irregular morphology. In thin ribbons a considerable fraction of supersaturated α-Al solid solution and the metastable Al4Cu9 phase have been detected. The experimental facts on the identity of the phases, their morphology and particle size for given processing conditions are discussed within the framework of a heat flow model including the solidification process as well as post-solidification transformations. The microstructural features are considered to be determined by local and time variations of the ribbon-wheel contact.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545179
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  • 17
    Electronic Resource
    Electronic Resource
    Trennung von einkernigen kationischen Rutheniumnitrosylnitrato-Komplexen mittels trägerfreier Duchflußisotachophorese (1983)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 315 (1983), S. 448-453 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00487058
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  • 18
    Electronic Resource
    Electronic Resource
    Extraktionsverhalten von Rutheniumnitrosyl-Komplexen in salpetersauren Lösungen (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 38-46 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00476227
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  • 19
    Electronic Resource
    Electronic Resource
    Entwicklung eines Analysenverfahrens für Rutheniumspuren in Pflanzenmaterial und Ermittlung der Transferfaktoren Boden/Pflanzen für Rutheniumverbindungen aus Wiederaufarbeitungsanlagen (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 331 (1988), S. 310-315 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Considerably different transfer factors soil/plant are reported in literature for the fission product ruthenium. As ruthenium belongs to those radioactive nuclides, that could be released from a reprocessing plant during an accident, reliable transfer factors should be explored under middle-European conditions for some typical nutrition plants. In an artificial humous and sandy soil spiked with 106Ru as RuO2 and RuCl3, pasture grass was grown under artificial illumination in our laboratory. The amounts of ruthenium taken up by the plants were determined by γ-spectrometry. For open-air investigations with pasture grass, wheat and potatoes inactive ruthenium(III) chloride and ruthenium nitrosylchloride were used. Ruthenium was determined by electrothermal atomic absorption spectrometry (ETAAS) after destroying the organic material and concentrating the solution. The concentration and chemical form of the ruthenium exert an unimportant influence on the transfer factor. For the pasture-grass, the stems of wheat and the weed of potatoes it amounts to 0.00005 to 0.0015, for the ear of wheat to about 0.00005. In peeled potatoes there was no ruthenium detectable, therefore the limit of detection leads to a transfer factor ≤0.00001. So it is evident that ruthenium is little available for the roots of the plants. In the event of an accident in a nuclear plant the uptake of radioactive ruthenium by roots has only negligible radioecological consequences. This applies even if 50 years of ruthenium enrichment in the soil are assumed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481901
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  • 20
    Electronic Resource
    Electronic Resource
    Organotin Compounds. Band 1. Herausgeg. von A. K. Sawyer. Marcel Dekker, Inc. New York 1971. 1. Aufl., XIV, 252 S., zahlr. Tab., geb. $ 30. -  (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 84 (1972), S. 1114-1114 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19720842218
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