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  • 1985-1989  (4)
  • 1980-1984
  • 1989  (3)
  • 1986  (1)
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  • 1985-1989  (4)
  • 1980-1984
Year
  • 1
    Electronic Resource
    Electronic Resource
    Critical currents of sintered and melt-textured YBa2Cu3Ox (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2856-2858 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High critical-current densities, Jc, have been observed in single crystals and thin films of YBa2Cu3Ox. Jc in bulk materials is diappointingly low reaching a maximum in untextured material of about 103 A cm−2. The importance of raising Jc in bulk materials is paramount and most applications of bulk materials require high Jc in high magnetic fields. The work of Jin et al. in raising Jc to 17 000 A cm−2 in zero field represents a most important step in the development of bulk materials and gives real hope to bulk applications. In the communication we first describe the properties of untextured wire, and then we describe our process for melt texturing and the difficulties encountered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342726
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Particle size distribution effects on sintering rates (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 383-391 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent interest in the use of near-monosize powders for ceramic processing has provoked questions concerning the dependence of the processing on the particle size distribution. One such factor is the sintering rate of the compact produced from a powder with a narrow particle size distribution. This issue is addressed theoretically by considering a log-normal particle size distribution which is characterized by a mean particle size and a width parameter. The sintering rates derived for model systems are examined for both the initial and intermediate stages, and these rates are found to be a strong function of the distribution width parameter. The sintering ability of a compact decreases with a broader particle size distribution and this effect becomes dramatic in the intermediate stage when grain growth is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337659
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Flocculation clustering and weakness of ceramics (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 130-132 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The size of defects in a ceramic can be estimated from the Griffith theory of fracture6"8. The bending strength cr of a ceramic rod has been related to the flaw size/, measured microscopically on a polished surface, by the equation a = 0.737 KJf 1/2 (1) where Klc is the fracture ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339130a0
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Acute toxicity of aluminium to fish eliminated in silicon-rich acid waters (1989)
    [s.l.] : Nature Publishing Group
    Nature 338 (1989), S. 146-148 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Atlantic salmon fry (Salmo salary 1 g mass, post-first feeding) were maintained in tanks (120 fish per tank) with a through-flow of water at about pH 5 and containing various concentrations of aluminium and silicic acid. The concentration of aluminium in natural waters is in the range 〈1 to 〉25 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/338146a0
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    Paper (German National Licenses)
    Fulltext
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