Now showing items 1-9 of 9

• #### A local view on the role of friction and shape ﻿

(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. ﻿

(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. ﻿

(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 ﻿

(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. ﻿

(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. ﻿

(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. ﻿

(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. ﻿

(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 ﻿

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 ...