118 citations · 266 across the 4 of their papers we have counts for
4 papers
Automated tomographic assessment of structural defects of freeze-dried pharmaceuticals
Patric Müller, Achim Sack, Jens Dümler +6
The topology and surface characteristics of lyophilisates significantly impact the stability and reconstitutability of freeze-dried pharmaceuticals. Consequently, visual quality co…
Energy Dissipation in Driven Granular Matter in the Absence of Gravity
Achim Sack, Michael Heckel, Jonathan E. Kollmer +2
We experimentally investigate the energy dissipation rate in sinusoidally driven boxes which are partly filled by granular material under conditions of weightlessness. We identify…
Coefficient of Restitution as a Fluctuating Quantity
Marina Montaine, Michael Heckel, Christof Kruelle +2
The coefficient of restitution of a spherical particle in contact with a flat plate is investigated as a function of the impact velocity. As an experimental observation we notice n…
Movers and shakers: Granular damping in microgravity
Marcus N. Bannerman, Jonathan E. Kollmer, Achim Sack +3
The response of an oscillating granular damper to an initial perturbation is studied using experiments performed in microgravity and granular dynamics mulations. High-speed video a…