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  • 1
    Electronic Resource
    Electronic Resource
    Fabrication and Morphological Stability of Aluminium Nanostructures En Route to Nanopatterned Sapphire (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 945-950 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: It has recently been demonstrated that it is possible to produce a pristine surface layer ona lapped sapphire substrate by depositing a thin film of aluminum and subjecting it to an appropriatethermal treatment. This process also shows promise for the fabrication of nanopatterned sapphireby pre-patterning the aluminum metal prior to thermal conversion to sapphire. We have exploredtwo distinct patterning processes: a dual layer photoresist e-beam lithography technique forfabricating arbitrarily shaped aluminum structures, and a novel, non-conventional mask-liftoffmethod involving nanoporous anodized aluminum oxide, useful for patterning very large scalearrays of sub-micron aluminum dots or posts. Our work is focused on refining the fabricationprocess and investigating the morphological stability of such metal nanostructures duringconversion to sapphire
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.945.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Simulation of Cold Ring Rolling Based on Rate Dependent Crystal Plasticity (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1813-1817 
    Details
    ISSN: 1662-9752
    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: Material behaviors of anisotropy and rate sensitivity affect cold ring rolling greatly. So, aself-developed incremental model of rate dependent crystal plasticity (RDCP) is utilized to forecastthe deformation characteristics of this forming process based on a 3D FE model underABAQUS/Explicit environment. The results show that the model of RDCP captures materialbehaviors of anisotropy and rate sensitivity better in this forming process by the comparison with themodel of J2 plasticity; with the decrease of rate sensitivity coefficient, the forming process becomesmore unstable with smaller rolling force and growth in ring radial direction; with the increase of feedrate of idle roll, the deformation of ring becomes more even while the rolling force becomes larger
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1813.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Megadose of T cell-depleted bone marrow overcomes MHC barriers in sublethally irradiated mice (1995)
    [s.l.] : Nature Publishing Group
    Nature medicine 1 (1995), S. 1268-1273 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Graft-versus-host disease (GVHD) is uniformly lethal in recipients of HLA-mismatched marrow. In patients with severe combined immunodeficiency disease, this major obstacle can be overcome by rigorous T-cell depletion before transplantation. In leukaemia patients, however, the benefit of preventing ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm1295-1268
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  • 4
    Electronic Resource
    Electronic Resource
    The saturation of electron-cyclotron maser and the time profile of emitted spikes (1987)
    Springer
    Solar physics 111 (1987), S. 167-173 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper the evolution of the hollow beam distribution of energetic electrons giving rise to ECM instability is investigated and the spatial dispersion term is included in the equation of wave energy. The instability causes the growth of wave energy, while the propagation of waves evacuates the electromagnetic energy from the source region. By analysing these two effects spike-like time profiles of waves are obtained. It is found that the saturation time t s of ECM emission and the duration of spikes increase with the decrease of the frequency of solar radio spike emission. The approximate expressions of t sand of the peak wave energy density are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145449
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The gradual and impulsive reconnection and the preheating of solar flares (1987)
    Springer
    Solar physics 107 (1987), S. 271-282 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the preheating phase of solar flares triggered by emerging magnetic flux. We consider the development of microinstabilities in the diffusion region during the emergence process and we propose four different types of reconnection, by which we explain the preheating, as well as the impulsive phase of flares. We find that during the emergence of new magnetic flux the current sheet will not ‘jump’ from the initial classical state to a fully turbulent one, but will remain in a marginally turbulent state which may develop either gradually or impulsively depending on the conditions of emergence. As a consequence of this, we find that four cases of reconnection are indeed possible: a week gradual heating, a weak impulsive process, a gradual preheating followed by an impulsive phase, and violent bursty reconnection. The expansion rate of the diffusion region, the duration of the gradual phase, the magnetic energy release, and the energy deposition rate in coronal loops during the gradual phase are derived under simplifying assumptions and applied to X-ray and UV observations of flares from the Solar Maximum Mission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152025
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  • 6
    Electronic Resource
    Electronic Resource
    Hollow beam distribution of energetic electrons and higher harmonics of electron cyclotron maser (1986)
    Springer
    Solar physics 104 (1986), S. 131-136 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The variations of the growth rates of ECM at first four harmonics in X-, Z-, and O-modes excited by a hollow beam distribution of weakly relativistic electrons with a parameter ξ ≡ ω p /Ω e are presented in this paper. The results show that the second harmonic of ECM in X-mode dominates the instability if ξ 〈 1, and if 1.2 ≲ ξ ≲, 2 or 2.2 ≲ ξ ≲ 3 the third or fourth harmonic will dominate. The second and third harmonics of Z-mode waves grow faster only if 2 ≲ ξ ≲ 2.2 and 3 ≲ ξ ≲ 3.2, respectively, so it would not be a competition in most cases. It is suggested that the ECM emission at these harmonics in X-mode is a possible mechanism to produce solar spike emissions with high brightness temperature at shorter and longer decimetric wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00159954
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