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  • Electronic Resource  (15)
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  • Electronic Resource  (15)
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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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  • 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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  • 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
    Influence of oxygen concentration on processing YBa2Cu3O7−x (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2485-2488 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The sintering kinetics of YBa2Cu3O7−x have been studied from 870 to 930 °C in oxygen/argon mixtures ranging from 0.2% to 100% oxygen. For sintering at temperatures below that required for formation of any liquid phase, densification rates increased with decreasing oxygen concentration, and transport critical current densities increased with increasing density. The activation energy for sintering was 190±30 kJ/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344260
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  • 5
    Electronic Resource
    Electronic Resource
    High-temperature deformation of YBa2Cu3O7−δ (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2079-2082 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Steady-state flow stress of dense (99% of theoretical) polycrystalline YBa2Cu3O7−δ has been measured in direct compression at temperatures between 870 and 980 °C in oxygen partial pressures of 0.03, 0.18, and 1.0×105 Pa for strain rates between 5×10−6 and 4×10−5 s−1. The stress exponent was close to one, indicating that diffusional flow was the dominant deformation mechanism. The flow stress decreased with decreasing oxygen partial pressure, obeying a power law with an exponent of approximately 1/2 . The activation energy was about 800 kJ/mol at an oxygen partial pressure 1×105 Pa, but decreased to 600 kJ/mol at a pressure of 3×103 Pa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344300
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  • 6
    Electronic Resource
    Electronic Resource
    Oxygen diffusion and phase transformation in YBa2Cu3O7−x (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 4325-4328 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Isothermal anneal experiments have been conducted over a wide temperature range from 300 to 900 °C for polycrystalline YBa2 Cu3 O7−x samples in air. The phase transformation and oxygen contents of the annealed samples were studied and determined by x-ray diffraction and iodine titration. Oxygen diffusion coefficients at different temperatures were determined by a novel technique based on direct observation of the oxygen diffusion fronts by polarized light microscopy. The activation energy for the diffusion of oxygen in YBa2 Cu3 O7−x was obtained by an Arrhenius plot of the diffusion coefficients at different temperatures. The tetragonal-to-orthorhombic phase transformation controlled by oxygen diffusion is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343979
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal structure and functional analysis of Dcp2p from Schizosaccharomyces pombe (2006)
    [s.l.] : Nature Publishing Group
    Nature structural & molecular biology 13 (2006), S. 63-70 
    Details
    ISSN: 1545-9985
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Decapping is a key step in both general and nonsense-mediated 5′ → 3′ mRNA-decay pathways. Removal of the cap structure is catalyzed by the Dcp1–Dcp2 complex. The crystal structure of a C-terminally truncated Schizosaccharomyces pombe Dcp2p reveals two distinct domains: an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nsmb1033
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  • 8
    Electronic Resource
    Electronic Resource
    Mullite Composite Phase Nanocrystalline from High-Silica Kaolin under Normal Pressure and Temperature: An Experimental Study (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1157-1160 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The synthesis and characterization of mullite composite nanocrystaline from high-silica kaolin sampled from Tianyang County of Guangxi Zhuang Autonomous Region is presented in this paper. Rough kaolin is firstly grounded and processed to remove impurities, iron and carbon before burned to produce composite oxides with mullite as major components. The composite oxides are further synthesized into composite mullite nanocrystaline by using hydrothermal crystallization process underlow temperature and normal pressure. Tests on the composite nanocrystalline by TEM, TG-TDA, and X-ray diffraction methods show that the nanocrystalline range in size from 40 to 100 nm and are well textured. They also show significantly enhanced thermal stability at temperature as high as 1000oC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1157.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    The Goss Texture Formation in Silicon Steels – Growth Selection or Oriented Nucleation? (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 105 (July 2005), p. 29-36 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The formation of the Goss texture in electrical steels is one of the most distinct phenomena of texture research. Nevertheless, disregarding 60 years of research the mechanisms which let only Goss-oriented grains grow abnormally during a secondary recrystallisation annealing are still not completely understood. The present paper reviews some of the mechanisms of growth selection and oriented nucleation and discusses them in the light of observations made by the authors. We conclude that no mechanism proposed so far is able to explain all experimental observations. This points out the need for the search for a different mechanism
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/21/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.105.29.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis of Mullite Nanocomposite from Natural Kaolin (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 803-805 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A new method of synthesizing mullite nanocomposite from raw natural kaolin is presented inthe paper. Raw kaolin is processed by oxidation-reduction fining method and then baked to produce finekaolin powder. The fine kaolin powder is further synthesized into mullite nanocomposite by open-systemhydrothermal crystallization method under normal pressure. With proper controls of NaOH mole ratio inthe hydrothermal solution, crystallization time, and constant temperature, the average grain size ofsynthesized nanocomposite changed from 80nm to 100nm. The morphology of the nanocomposite couldgradually change from platy to short prismatic, lamellar, and needle-like with increasing nucleation rate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.803.pdf
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