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  • Electronic Resource  (4)
  • 2010-2014
  • 2000-2004  (4)
  • 1985-1989
  • 1940-1944
  • 2002  (1)
  • 2001  (3)
  • PACS. 07.05.Tp Computer modeling and simulation – 02.60.Cb Numerical simulation; solution of equations – 52.70.Kz Optical (ultraviolet, visible, infrared) measurements  (2)
  • PACS. 45.70.Cc Static sandpiles; granular compaction – 72.80.Tm Composite materials  (2)
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  • Electronic Resource  (4)
Years
  • 2010-2014
  • 2000-2004  (4)
  • 1985-1989
  • 1940-1944
Year
  • 2002  (1)
  • 2001  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Correlation between compacity distributions in compressed Si powders and in Si sintered pellets (2002)
    Springer
    The European physical journal 26 (2002), S. 35-39 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 45.70.Cc Static sandpiles; granular compaction – 72.80.Tm Composite materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Resistivity measurements have been performed on silicon powder beds with different thicknesses which were submitted to uniaxial pressure (0-640 MPa). For the smallest thicknesses of the Si pellets, the pressure dependence of conductivity may be described using models based on effective medium theory or strongest stresses network. For largest Si thicknesses, it exists an inhomogeneous distribution of pressure in the granular medium as a consequence of arching effects. It is shown that the conductivity variation with Si powder thickness may be understood using a distribution of conductivity induced by the distribution of pressure. Finally, it is shown that the conductivity of the sintered Si pellets is correlated with the uniaxial compression step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020063
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rate of creation of the contacts between grains in a loose array of particles submitted to an uniaxial pressure (2001)
    Springer
    The European physical journal 21 (2001), S. 507-510 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 45.70.Cc Static sandpiles; granular compaction – 72.80.Tm Composite materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Macroscopic resistivity measurements have been performed on TiC/Al2O3 random mixtures submitted to uniaxial compression (0-95 kN). Such a random mixture exhibits an insulator-conductor transition which appears at increasing force while decreasing the conductive composition of the TiC/Al2O3 mixture. It is demonstrated that the conductivity behavior may be understood in the framework of a site percolation model. Finally, the rate of creation of the contacts between conductive grains is extracted from the macroscopic resistivity measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170160
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Design study of 3-D tomography diagnostics for spherical tokamaks (2001)
    Springer
    The European physical journal 14 (2001), S. 97-103 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 07.05.Tp Computer modeling and simulation – 02.60.Cb Numerical simulation; solution of equations – 52.70.Kz Optical (ultraviolet, visible, infrared) measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A novel three-dimensional (3-D) tomography software has been developed for spherical tokamak (ST) plasmas with thin central coils. It enables us to measure whole 3-D annular profiles of ST plasma emissivity (line spectrum etc.) using limited number of detectors located on a sphere outside of its separatrix. The numbers and positions of detectors have been optimized for STs that contain low-n toroidal modes from n = 1 to 5. Mathematical method allowing for the removal of the thin central coil from the region of reconstruction and to reconstruct STs with single and double axes are also discussed. The shadow effect of center coil region was found to limit the reconstruction accuracy, indicating that the low-aspect ratio torus (ST) is essential to this new 3-D tomography diagnostics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170240
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Tomographic determination of plasma velocity with the use of ion Doppler spectroscopy (2001)
    Springer
    The European physical journal 17 (2001), S. 337-344 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 07.05.Tp Computer modeling and simulation – 02.60.Cb Numerical simulation; solution of equations – 52.70.Kz Optical (ultraviolet, visible, infrared) measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: An inversion method for ion Doppler shift of spectrum lines was developed for plasma velocity measurements. By reducing the problem to the vectorial Radon transform, the characteristics of plasma ion velocity distribution such as vector potential/vorticity and velocity components were computed in two-dimensional space. Computer simulation of the reconstruction of different vector potential (vector field) models gives evidence that the reconstruction errors are acceptable, and the method can surely be used for real experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170008
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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