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  • 1995-1999
  • 1985-1989  (2)
  • 1987  (2)
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Years
  • 1995-1999
  • 1985-1989  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 22 (1987), S. 1999-2005 
    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 superconducting compound Nb3Sn was produced by the reduction of the oxides or hydroxides of niobium and tin. The procedure consists of the following three steps; (i) preparation of the mixed oxides or hydroxides, (ii) direct alloy reduction, and (iii) homogenizing heat treatment of the reduced metal powders. For mixing the two oxides, two methods were tried: the simultaneous precipitation from the aqueous solution and the solidification of the molten oxides. These mixed oxides were reduced by ca!ciunn or magnesium vapour in the temperature range 973 to 1373 K. After calcium or magnesium oxide was removed by leaching the fine compound powder had an A-15 type crystal structure, but showed a relatively low superconducting critical temperature (T c). The isothermal annealing improvedT c to 18.0 K.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 11 (1987), S. 89-94 
    ISSN: 1432-5195
    Keywords: Bone alloimplants ; Decalcified ; Osteoinduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Afin d'apprécier l'efficacité clinique des allogreffes osseuses décalcifiées en surface et totalement décalcifiées, nous avons comparé radiologiquement l'incorporation de ces deux types d'allogreffes dans le lit osseux récepteur chez des malades opérés de butée de la hanche. Nous nous sommes référés aux résultats cliniques obtenus avec des autogreffes. Dans tous les cas, les deux types d'allogreffes décalcifiées se sont bien incorporés à l'os réceptuer. Cependant, dans les cinq cas examinés, les allogreffes totalement décalcifiées se sont résorbées avec peu ou sans apposition d'os nouveau. En revanche, les allogreffes décalcifiées en surface ont été parfaitement incorporées, bien qu'il ait fallu plus d'un an pour obtenir cette incorporation. Ces constatations indiquent que, contrairement `a ce que l'on aurait pu attendre des résultats de l'expérimentation animale, la décalcification accrue des allogreffes osseuses réduit leur efficacité clinique.
    Notes: Summary The relative clinical efficacy of surface-decalcified and wholly decalcified bone alloimplants was studied by observing radiographically the incorporation of the two types into the recipient bone bed in cases of shelf arthroplasty of the hip joint. In all cases, the decalcified alloimplants were incorporated well in an intraskeletal site. However, in all five cases examined, wholly decalcified alloimplants in a paraskeletal site were resorbed with little or no new bone deposition. In contrast, surface-decalcified alloimplants in a paraskeletal site were consistently incorporated, though their complete integration required more than one year. These findings show that, contrary to the results in experimental animals, increased decalcification of bone alloimplants reduced their clinical efficacy.
    Type of Medium: Electronic Resource
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