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Category/Subcategory: Natural Sciences/Physics

Angles of repose observed in heap (de-)construction

Author: Claas Bierwisch
In a Discrete Element Method (DEM) simulation angles of repose are analyzed which reveal static properties of a granular material. The theoretical maximum angle is related to the internal angle of friction of the material, $\phi = ... more

Views: 1029

The future in a new light - Futuris

Author: Euronews Knowledge
From the Sun, the Moon and flames, to ultra-modern semiconductors, human history is inherently bound to light. In this special edition of Futuris, we meet scientists and engineers who are making our futures brighter. Made by eu ... more

Views: 918

Synthesis of colloidal PbS nanosheets

Author: Christian Klinke
Synthesis of colloidal PbS nanosheets in a three-neck flask as it has been performed e.g. in T. Bielewicz et al. "Tailoring the height of ultrathin PbS nanosheets and their application as field-effect transistors", Small 11 (2015) ... more

Views: 1529

Chromospheric heating - Movie 1

Author: Michal Sobotka
Time series of Ca II line-center images (69 minutes, 80 frames) and the region of interest.

Views: 637

Before the Big Bang: What Happened? - Space

Author: Euronews Knowledge
The universe was born 13.7 billion years ago with the Big Bang. But what was there before? Scientists are starting to get an answer thanks to the time-travelling Planck mission. Made by euronews, the most watched news channel i ... more

Views: 980

Making Fire From Water - Futuris

Author: Euronews Knowledge
A euronews futuris feature from October 30, 2013. Made by euronews, the most watched news channel in Europe. euronews knowledge brings you a fresh mix of the world's most interesting know-hows, directly from space and sci-te ... more

Views: 1042

Why is it so hard to detect dark matter?

Author: Euronews Knowledge
Made by euronews, the most watched news channel in Europe. euronews knowledge brings you a fresh mix of the world's most interesting know-hows, directly from space and sci-tech experts.

Views: 508

SPH simulation of a particle impact on a ductile target

Author: Christian Nutto
The sequence shows an impacting body on a ductile target made of Al6061-T1. The impacting body is assumed to be ideally hard. The impact velocity is $45 \mathrm{m/s}$ and is tilted $51^°$ from the horizontal axis. The spacing of ... more

Views: 991

Brittle fracture in three point bending test

Author: Claas Bierwisch
Simulation of a three point bending test of a silicon crystal. The upper cylinder is pushed downward in a path-controlled trajectory. On contact, the induced stresses on the upper and lower surface are discernible. Tensile stresse ... more

Views: 1276

Wave propagation in a sunspot's atmosphere

Author: Johannes Löhner-Böttcher
A sunspot observation (NOAA11823) is shown. First the sunspot (HMI continuum intensity) rotates across the solar disk. Then the region is zoomed in and changes to the high-resolution observation of the Dunn Solar Telescope. Then t ... more

Views: 1019