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  • 1
    Electronic Resource
    Electronic Resource
    Matrix effect of bombardment-induced Gibbsian segregation on Cu depletion at a CuxNi100−xsubsurface (1995)
    Springer
    Applied physics 61 (1995), S. 419-423 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  A dynamic Monte-Carlo program, including an improved BIGS (Bombardment-Induced Gibbsian Segregation) model was employed to study the matrix effect of BIGS and its influence on Cu depletion at the subsurface under 1 keV Ar-ion bombardment of a Cu–Ni alloy. The calculation results show that not only at high fluences (the steady state) but also at low fluences, the Cu subsurface depletion depends on its bulk composition. This is because the atomic jump rate W 21 of Cu from the second layer to the first layer is correlated to Cu bulk composition at any fluence. We also found that the product of the non-segregating species concentration at the first layer with the segregating species concentration at the second layer plays a more important role than other parameters in determining W 21 under low current conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01540117
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Matrix effect of bombardment-induced Gibbsian segregation on Cu depletion at a Cu x Ni100−x subsurface (1995)
    Springer
    Applied physics 61 (1995), S. 419-423 
    Details
    ISSN: 1432-0630
    Keywords: 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A dynamic Monte-Carlo program, including an improved BIGS (Bombardment-Induced Gibbsian Segregation) model was employed to study the matrix effect of BIGS and its influence on Cu depletion at the subsurface under 1 keV Ar-ion bombardment of a Cu−Ni alloy. The calculation results show that not only at high fluences (the steady state) but also at low fluences, the Cu subsurface depletion depends on its bulk composition. This is because the atomic jump rateW 21 of Cu from the second layer to the first layer is correlated to Cu bulk composition at any fluence. We also found that the product of the non-segregating species concentration at the first layer with the segregating species concentration at the second layer plays a more important role than other parameters in determiningW 21 under low current conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01540117
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Localized superplastic deformation of nanocrystalline 3Y-TZP ceramics under cyclic tensile fatigue at ambient temperature (1998)
    Springer
    Journal of materials science 33 (1998), S. 2719-2723 
    Details
    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 Cyclic tensile fatigue tests were performed on 100±20 nm, and 0.35 μm 3Y-TZP ceramic specimens at room temperature. Localized superplastic deformation of the grains in the 100 nm material at and near to the fracture surfaces was first identified by AFM imaging. Slip band-like microfeatures, similar to those reported on some metals, were also unexpectedly seen to develop on the side faces. In contrast, the 0.35 μm specimens retained their equiaxed grain morphology after undergoing similar testing conditions. The micromechanisms underlining these phenomena were discussed. Grain boundary diffusion of the respective atomic species is reasoned to be the major governing process in operation. And the contribution of a dislocation slip mechanism is considered to play a possible or parallel role. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004390227100
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Demonstration of polar zinc distribution in pollen tubes ofLilium longiflorum with the Heidelberg proton microprobe (1983)
    Springer
    Protoplasma 116 (1983), S. 201-203 
    Details
    ISSN: 1615-6102
    Keywords: Lilium ; Pollen tube ; Proton-induced X-ray emission (PIXE) ; The Heidelberg proton microprobe ; Polar zinc distribution ; mRNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The zinc distribution in pollen tubes ofLilium longiflorum was analysed by proton-induced X-ray emission (PIXE) with the Heidelberg proton microprobe. A very high zinc concentration was measured in the pollen tube tip region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279839
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Distribution of elements in the lily pollen tube tip, determined with the Oxford scanning proton microprobe (1985)
    Springer
    Protoplasma 126 (1985), S. 147-152 
    Details
    ISSN: 1615-6102
    Keywords: Elemental map ; Lilium ; Oxford proton microprobe ; Scanning proton microprobe ; Proton induced X-ray emission ; Pollentube
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Pollen tubes ofLilium longiflorum were fixed with glutaraldehyde and investigated unsectioned with the Oxford scanning proton microprobe (SPM). Two-dimensional maps which show the distribution and concentration of phosphorus, sulphur, chlorine, potassium, calcium, iron, copper, zinc and arsenic are presented. The maps show that, within the pollen tube tip region, calcium and zinc exhibit relatively steep longitudinal concentration gradients compared to the more flat distributions of phosphorus and sulphur. Chlorine, potassium, iron and copper appear equally distributed along the tube. All elements with the expception of arsenic show the highest concentration within the cell protoplasm and not in the cell wall. Additional signals of arsenic, chlorine and potassium originate from the remaining fixative dried around the tube, containing also the free ions of the cell. The arsenic signals originate exclusively from the buffer used during fixation. The different maps are compared and discussed in relation to their significance to the pollen tubes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287681
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    Paper (German National Licenses)
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