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  • BiSCCO  (1)
  • C57BL/6J  (1)
  • CO oxidation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Gold nanoparticles: effect of treatment on structure and catalytic activity of Au/Fe2O3 catalyst prepared by co‐precipitation (2000)
    Springer
    Catalysis letters 67 (2000), S. 117-128 
    Details
    ISSN: 1572-879X
    Keywords: Au/Fe2O3 catalyst ; structural study ; CO oxidation ; mechanism of the structural changes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 1 wt% Au/Fe2O3 catalyst was prepared by a co‐precipitation method. The structure of the sample in the as prepared, oxidized and reduced states was investigated by means of X‐ray photoelectron spectroscopy (XPS), transition electron microscopy (TEM), electron diffraction (ED) and X‐ray diffraction (XRD). The structure of the samples after various treatments and their activity in the CO oxidation were compared. The results show the stability of the gold particle size during the treatments. However, after oxidation, a slight shift in the Au 4f binding energy towards lower values points to the formation of an electron‐rich state of the metallic gold particles compared to that revealed in the as prepared sample. Simultaneously, a goethite phase in the Fe2O3 support is present, which is not observed in the “as prepared” and reduced samples. In the reduced sample the presence of a crystalline maghemite‐c phase indicates a change in the support morphology. In the CO oxidation the oxidized sample shows the highest activity and it might be the result of the cooperative effect of goethite, FeO and the electron‐rich metallic gold nanoparticles. We suggest that a structural transformation occurs along the gold/support perimeter during the treatments and we propose a possible mechanism for the effect of the oxidation treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019073723384
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Casting high-T c superconducting BiSCCO (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 253-263 
    Details
    ISSN: 1572-9605
    Keywords: casting, heat treatment ; superconductors ; BiSCCO
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Bi-Sr-Ca-Cu-O (BiSCCO) was melted and cast into molds in order to render the superconductor into fully dense and useful shapes. Special conditions for casting and subsequent heat treatments were required to ensure structural integrity and a high transition temperature,T c .The history of the castings during heat treatments was studied by thermal analysis, X-ray diffraction, and microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617876
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A Quantitative Genetic Analysis of Locomotor Activity in CXB Recombinant Inbred Mice (1999)
    Springer
    Behavior genetics 29 (1999), S. 319-328 
    Details
    ISSN: 1573-3297
    Keywords: Recombinant inbred mice ; circadian ; locomotor activity ; QTL ; C57BL/6J ; BALB/cByJ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Recent studies have identified genes that influence the length of the circadian period maintained by mice housed under constant lighting conditions. However, a less studied circadian activity variable is the amplitude of daily oscillations in locomotor activity. This parameter reflects spontaneous activity exhibited under standard lighting and housing conditions and, therefore, differs conceptually from assessments of exploratory or open-field activity, voluntary wheel-running, or circadian period during exposure to constant light or constant darkness conditions. We recently observed a greater daily amplitude of oscillation in spontaneous locomotor activity in C57BL/6 mice compared to BALB/cBy mice. To identify genetic loci with potential linkage to circadian variation in the amount of locomotor activity, we measured the spontaneous activity of 13 CXB recombinant inbred (RI) strains of mice. The probability density distributions of locomotor activity phenotypes for the 13 CXB RI strains were consistent with the presence of a low number of major quantitative trait loci affecting this trait. Regions of chromosomes 3, 8, 12, 13, and 19 showed provisional linkage to strain variation in locomotor activity. Probabilities of linkage were not sufficient for declaration of an activity-related quantitative trait locus but were sufficient to warrant further analysis either with additional RI strains or with F2 panels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021657800287
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    Paper (German National Licenses)
    Fulltext
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