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  • 1
    Electronic Resource
    Electronic Resource
    Solid-state displacement reactions in the Fe-Ni-S and Cu-Ni-S systems between 400 and 500°C (1984)
    Springer
    Oxidation of metals 22 (1984), S. 147-160 
    Details
    ISSN: 1573-4889
    Keywords: Fe-Ni-S system ; Cu-Ni-S system ; displacement reaction ; diffusion path ; ternary diffusion ; multiphase diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Solid-state displacement reactions of the type A+BS→B+AS have been studied in the systems Fe-Ni-S and Cu-Ni-S. In diffusion couples, mainly of the type Fe/Ni3S2 and Cu/Ni3S2, the layer sequence, morphology, and growth rate of the reaction products have been investigated. The layer sequence of the reaction products in the couples appears to be just the reverse of that found previously in displacement reactions in some couples of oxide systems like Ni/Cu2O and Co/Cu2O. We find the sequence A/B/AS/BS, whereas in the oxide systems the sequence A/AO/B/BO has been found. This means that the metal atoms exchange and sulfide ions practically stand still in the first case, whereas in the oxide system the transport of oxygen is essential. For a correct interpretation of the results it was necessary to determine the isothermal cross-section through the Fe-Ni-S system at 460 and 500°C. At 500°C the iron stabilized high-temperature modification β-Ni3S2 was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656902
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the layer sequence and morphology in solid-state displacement reactions (1984)
    Springer
    Oxidation of metals 22 (1984), S. 161-180 
    Details
    ISSN: 1573-4889
    Keywords: displacement reactions ; ternary diffusion ; multiphase diffusion ; diffusion path ; Ni-Cu-O ; Co-Cu-O ; Fe-Ni-O ; Fe-Cu-O ; Cu-Ni-S ; Fe-Ni-S ; Cr-Ni-S
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In displacement reactions of the type pA+BqX→qB+ApX, two main forms of the layer sequence have been found in the reaction layer, namely, A/ApX/B/BqX and A/B/ApX/BqX. In this paper it is argued that the thermodynamics of the system, more specifically the dependence of the activity of element X on the mole ratio between the elements A and B, determines the initial layer sequence. Various morphological variants of the two basic types may develop because of the kinetics. The prediction of the layer sequence and morphology made on the basis of this theory has been verified on a number of oxidic and sulfidic systems. It is, however, pointed out that these predictions also can be applied to purely metallic ternary systems and to other types of reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656903
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The structure of the middle ear epithelium of the rat and the effect of Eustachian tube obstruction (1984)
    Springer
    Journal of molecular histology 16 (1984), S. 807-818 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The middle ear cavity of the rat is lined with ciliated and squamous epithelium. The arrangement of the ciliated cells, interspersed with secretory cells, in distinct tracts and their continuity with the ciliated epithelium of the Eustachian tube, suggests the existence of a mucociliary transport system for cleaning the middle ear cleft. The secretory cells produce either neutral or sulphated glycoproteins, dependent on their location. In addition to these secretions, the epithelium of the lower part of the Eustachian tube is bathed with secretory products of seromucous glands. Also in the areas with squamous epithelium, numerous small secretory cells, the character of which is only identifiable with the electronmicroscope, are present. It is concluded that the middle ear lining can be considered as a locally modified respiratory epithelium. Blockade of the mucociliary transport system, supposedly a crucial aetiological factor in secretory otitis media, by obstruction of the Eustachian tube, induces pathogenic behaviour of microorganisms normally present in the middle ear. This results in either a transient or a longstanding infective middle ear disease, associated with a large variety of changes of the mucosa, especially with respect to the secretory activity. The data obtained indicate that the increased secretory activity encountered in secretory otitis media cannot be attributed to the isolated effect of tubal occlusion, but rather to an infective process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01002787
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    Paper (German National Licenses)
    Fulltext
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