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  • 1985-1989  (13)
  • 1
    Electronic Resource
    Electronic Resource
    X-ray determination of the atomic displacements in NbC0.72 (1986)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 19 (1986), S. 417-419 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Integrated X-ray intensities of Bragg peaks have been measured with an NbC0.72 single-crystal which contains a large number of non-stoichiometric carbon vacancies. By standard structural analysis the mean-square displacements were determined to be (u2Nb) = 0.0041 (7) Å2 for Nb atoms and (u2C) = 0.0111 (20) Å2 for C atoms. This (u2Nb) is comparable to the value of 0.0045 Å2, extrapolated from the compositional dependence of (u2Nb) proposed by Metzger, Peisl & Kaufmann [J. Phys. F. (1983). 13, 1103–1113]. It was confirmed that the existence of carbon vacancies induces larger static displacements of neighbouring niobium atoms, and the contribution of thermal displacements to the observed (u2Nb) appears to be rather small in a non-stoichiometric niobium monocarbide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988608901X
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  • 2
    Electronic Resource
    Electronic Resource
    Increase in the expression of the ornithine decarboxylase gene in mouse skin by ultraviolet light (1989)
    Springer
    Archives of dermatological research 281 (1989), S. 514-516 
    Details
    ISSN: 1432-069X
    Keywords: Ornithine decarboxylase ; Gene expression ; Ultraviolet-B ; Tumor promotion ; Photocarcinogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00510092
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changes of tensile strength and electrical resistivity of taeniolite/acriflavine complex film by carbonization (1988)
    Springer
    Journal of materials science 7 (1988), S. 985-986 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720750
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal degradation behaviour of fluorosaponite-α-naphtylamine complex under nitrogen (1986)
    Springer
    Journal of materials science 21 (1986), S. 1227-1232 
    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 layer-type complex of fluorosaponite andα-naphtylamine (F-SNC) was heat treated below 1473 K under nitrogen to investigate its thermal degradation behaviour. The most striking characteristic of the behaviour is that the layered structure of F-SNC remained considerably unchanged up to temperatures as high as 1273 K. In order to derive the clay-carbon layer-type complex from the clay-organic compound complex, the degradation behaviour of F-SNC was compared with those of other complexes reported previously. As a result, the most important factor to arise from this work is to use a layered-structural clay with high thermal stability and to intercalate organic compounds, with high carbon yield, as much as possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553255
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  • 5
    Electronic Resource
    Electronic Resource
    Some properties of a condensed polynuclear aromatic resin (COPNA) as a binder for carbon fibre composites (1986)
    Springer
    Journal of materials science 21 (1986), S. 2027-2032 
    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 new thermosetting resin consisting of condensed aromatic nuclei cross-linked with methylene bridges was prepared from a mixture of pyrene, phenanthrene and 1,4-benzenedimethanol by heating above 393 K. This resin, named COPNA, adheres well to carbon fibres, and the carbon fibre/resin composite (CFRP) prepared by using this resin as a binder exhibits no remarkable changes in mechanical properties after heating at 523 K for 10 h and 573 K for 2h. The CFRP specimens were converted into carbon fibre/carbon composite (CFRC) by further heating up to 1 273 K without any trouble.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547943
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  • 6
    Electronic Resource
    Electronic Resource
    Characteristics of mouldings made from the saponite/acriflavine complex after heating under nitrogen (1987)
    Springer
    Journal of materials science 22 (1987), S. 1045-1050 
    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 Carbonization of the clay/organic layer-type complex produces the clay/carbon layer-type complex or clay (or its heat-treated derivative) together with finely dispersed carbon. To evaluate the characteristics of a moulding made from such structures, the saponite/acriflavine complex powder was pressed into a moulding (10 × 10 mmϕ) under 1000 kg cm−2 and then carbonized below 1673 K under nitrogen. Some properties of the moulding, such as electrical resistivity, varied widely with carbonization temperature, but, on the whole, it behaved as an intermediate material between the ceramics and the carbon materials. Its most unique property is low electrical resistivity, in spite of its low carbon content. Structural changes that take place during the carbonization process are discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01103549
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal degradation behaviour of the layer-type complexes of montmorillonite/α-naphthylamine, saponite/α-naphthylamine and their mixtures (1988)
    Springer
    Journal of materials science 23 (1988), S. 4066-4070 
    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 Samples of montmorillonite/α-naphthylamine complex (MNC), saponite/α-naphthylamine complex (SNC) and their mixtures were heated at temperatures below 1473 K under a nitrogen atmosphere to examine macroscopic structural change and crystalline phases deposited after pyrolysis. SNC resulted in a dense structure after pyrolysis. Heating of samples of MNC/SNC mixtures gave a porous structure which became dense as the proportion of SNC increased. No porosity measured by the mercury porosimeter was detectable in samples pyrolysed from MNC containing more than 25% SNC. After pyrolysis, the MNC/SNC mixtures gave crystalline phases which were never formed in the pyrolysed pure MNC and SNC. The formation of these crystalline phases was explained by reference to the chemical compositions of the mixtures and the phase diagram.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106836
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  • 8
    Electronic Resource
    Electronic Resource
    Syntheses and thermal degradation behaviours of saponite-α-naphthylamine complexes: effects of substitution of OH in saponite by fluorine (1988)
    Springer
    Journal of materials science 23 (1988), S. 1764-1768 
    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 Five saponites with various substitution degrees of the constituent OH by fluorine were subjected to complex formation with α-naphthylamine to examine the effect of substitution on the stabilities of the resulting complexes. Saponite with a larger substitution degree intercalated a lesser quantity of a-naphthylamine and was broken down more easily in the reaction process. The complexes were subsequently heated in nitrogen to examine their thermostabilities. The thermostability of saponite was enhanced with increasing degree of substitution. All saponite, especially those without substitution, enhanced their thermostabilities by intercalating with α-naphthylamine. The reasons for these phenomena are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01115720
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal degradation behaviour of montmorillonite-α-naphthylamine complex under nitrogen (1985)
    Springer
    Journal of materials science 20 (1985), S. 255-260 
    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 thin film of montmorillonite-α-naphthylamine complex (MNC) was prepared, and then subjected to γ-ray radiation and heating to 473 K for polymerization of the inserted naphthylamine. MNC was subsequently heated to various temperatures below 1473 K under nitrogen. Montmorillonite film (Mont) was also treated in the same way as the reference sample. Compared with Mont, the MNC-layered structure was remarkably thermally stable and remained so slightly, even after heating to 1273 K. MNC was found to have a homogeneous porous structure after heating to 1273 K. Through comparison with Mont, the thermal degradation behaviour of MNC is discussed on the basis of X-ray diffraction, FT-IR, TG-DTA, elemental analysis, mass spectrum and SEM observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555919
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  • 10
    Electronic Resource
    Electronic Resource
    Oxidation resistivity of montmorillonite-α-naphthylamine complex heated under nitrogen (1985)
    Springer
    Journal of materials science 20 (1985), S. 516-523 
    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 thin film of montmorillonite-α-naphthylamine complex (MNC) was heated to various temperatures below 1473 K for 5 min under nitrogen. The resulting samples were further heated to 1073 to 1473 K for 30 min or 5 h in air to examine their oxidation resistivities. A thin montmorillonite film was also treated in the same manner for reference purposes. The layered structure of MNC was retained up to 1273 K under nitrogen, although it changed gradually to an amorphous state with increase in temperature. MNCs after heating below 1073 K under nitrogen were changed to montmorillonite by subsequent heating to 1073 K for 30 min in air, whereas, MNCs heated to 1173 and 1273 K under nitrogen retained somewhat their layered structures, even after heating to 1173 K for 30 min in air. The causes for such differences are discussed on the basis of the results obtained from X-ray diffraction, thermogravimetry, FT-IR and SEM observation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026521
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