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  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Tracer diffusion of 110Ag in YBa2Cu3O7−δ (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2523-2525 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tracer diffusion of 110Ag in YBa2Cu3O7−δ has been measured in the temperature range 800–950 °C using serial sectioning. The polycrystalline samples were made either from a powder containing about 0.2% Zr prepared by a conventional technique, or from a purer powder that had been calcined in low-pressure oxygen. Concentration profiles indicate both a volume and a fast diffusivity path contribution to diffusion. The activation energies were 227±3 and 249±17 kJ/mole for samples made from powder calcined in low-pressure oxygen and conventional powder, respectively. Diffusion was slower in the samples made from the purer powder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346472
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new method to introduce the Möbius function and the Möbius transform (1994)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 3099-3108 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The Möbius function and Möbius transform are introduced and derived in a manner that parallels a typical inverse problem of physics, rather than in the usual number-theoretic manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530455
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Tracer diffusion of 110Ag in Bi2Sr2CaCu2Ox (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2291-2293 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tracer diffusion of 110Ag in dense polycrystalline Bi2Sr2CaCu2Ox has been measured at temperatures from 600 to 800 °C at an oxygen pressure of 105 Pa, and in oxygen partial pressures from 103 to 105 Pa at 700 °C. The diffusivity of Ag in Bi2Sr2CaCu2Ox is given by D=(8.9−4.2+7.9)exp[−(181.4±4.8 kJ/mol)/RT] cm2/s, and is not a sensitive function of oxygen partial pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107033
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ecology and behavior of wild black-crested gibbons (Hylobates concolor) in China with a reconsideration of evidence for polygyny (1991)
    Springer
    Primates 32 (1991), S. 539-548 
    Details
    ISSN: 0032-8332
    Keywords: Crested gibbons ; China ; Behavior ; Ecology ; Monogamy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The black-crested gibbon,Hylobates concolor, is one of the few species of gibbons that has not yet been the subject of a long term field study. Field observations in the Ai Lao and Wu Liang Mountains of Yunnan Province, China indicate that in this area the habitat and ecology of this species differ markedly from those of other gibbons that have been studied to date. These differences are correlated with some behavioral differences. In particular, these gibbons apparently have greater day ranges than other gibbons. It has also been suggested that this species lives in polygynous groups. To demonstrate this requires observation of groups with two or more females with young. Our own observations and those from other recent studies suggest that there are alternative explanations consistent with available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02381946
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    Paper (German National Licenses)
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