Now showing items 1-9 of 9

    • A local view on the role of friction and shape 

      Schröter, Matthias (EPJ Web of Conferences, 2017)
      Leibniz said "Naturam cognosci per analogiam": nature is understood by making analogies. This statement describes a seminal epistemological principle. But one has to be aware of its limitations: quantum mechanics for example ...
    • Analyzing X-ray tomographies of granular packings. 

      Weis, Simon; Schröter, Matthias (The Review of scientific instruments, 2017-05)
      Starting from three-dimensional volume data of a granular packing, as, e.g., obtained by X-ray Computed Tomography, we discuss methods to first detect the individual particles in the sample and then analyze their properties. ...
    • Correction of beam hardening in X-ray radiograms. 

      Baur, Manuel; Uhlmann, Norman; Pöschel, Thorsten; Schröter, Matthias (The Review of scientific instruments, 2019-02)
      The intensity of a monochromatic X-ray beam decreases exponentially with the distance it has traveled inside a material; this behavior is commonly referred to as Beer-Lambert's law. Knowledge of the material-specific attenuation ...
    • Correlation between Voronoi volumes in disc packings 

      Zhao, Song-Chuan; Sidle, Stacy; Swinney, Harry L; Schröter, Matthias (EPL (Europhysics Letters), 2012-02-01)
      We measure the two-point correlation of free Voronoi volumes in binary disc packings, where the packing fraction $\phi_{\rm avg}$ ranges from 0.8175 to 0.8380. We observe short-ranged correlations over the whole range of ...
    • Influence of humidity on tribo-electric charging and segregation in shaken granular media. 

      Schella, André; Herminghaus, Stephan; Schröter, Matthias (Soft matter, 2017-01)
      We study the effect of humidity on the charge accumulation of polymer granulates shaken vertically in a stainless steel container. This setup allows us to control the humidity level from 5% to 100%RH while performing automated ...
    • Measuring the configurational temperature of a binary disc packing. 

      Zhao, Song-Chuan; Schröter, Matthias (Soft matter, 2014-06)
      Jammed packings of granular materials differ from systems normally described by statistical mechanics in that they are athermal. In recent years a statistical mechanics of static granular media has emerged where the thermodynamic ...
    • Nucleation in Sheared Granular Matter. 

      Rietz, Frank; Radin, Charles; Swinney, Harry L; Schröter, Matthias (Physical review letters, 2018-02)
      We present an experiment on crystallization of packings of macroscopic granular spheres. This system is often considered to be a model for thermally driven atomic or colloidal systems. Cyclically shearing a packing of frictional ...
    • Stationary state volume fluctuations in a granular medium. 

      Schröter, Matthias; Goldman, Daniel I; Swinney, Harry L (Physical review. E, Statistical, nonlinear, and soft matter physics, 2005-03-30)
      A statistical description of static granular material requires ergodic sampling of the phase space spanned by the different configurations of the particles. We periodically fluidize a column of glass beads and find that ...
    • Structural similarity between dry and wet sphere packings 

      Weis, Simon; Schröder-Turk, Gerd E; Schröter, Matthias
      The mechanical properties of granular materials change significantly in the presence of a wetting liquid which creates capillary bridges between the particles. Here we demonstrate, using X-ray tomographies of dry and wet ...