Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Jungmann, Felix"'
Publikováno v:
F. Chioma Onyeagusi et al 2023 Planet. Sci. J. 4 13
Surfaces of planetary bodies can have strong electric fields, subjecting conductive grains to repulsive electrostatic forces. This has been proposed as mechanism to eject grains from the ground. To quantify this process, we study mm-sized basalt aggr
Externí odkaz:
http://arxiv.org/abs/2301.11609
We introduce collisions of solids as a new and efficient ionization mechanism for gas in protoplanetary disks, which especially operates in the dense midplane of protoplanetary disks. This idea is sparked by laboratory experiments where we found that
Externí odkaz:
http://arxiv.org/abs/2207.07551
Autor:
Kruss, Maximilian, Salzmann, Tim, Parteli, Eric, Jungmann, Felix, Teiser, Jens, Schönau, Laurent, Wurm, Gerhard
Publikováno v:
Planet. Sci. J. 2 238 (2021)
It is a long-standing open question whether electrification of wind-blown sand due to tribocharging - the generation of electric charges on the surface of sand grains by particle-particle collisions - could affect rates of sand transport occurrence o
Externí odkaz:
http://arxiv.org/abs/2112.05471
Publikováno v:
Physical Review E 104, L022601 (2021)
In microgravity experiments, we quantified the net charge on systems of two identical, 434 \textmu m diameter glass spheres before and after a collision. We find that charge conservation is significantly violated. Independent of the sign of the total
Externí odkaz:
http://arxiv.org/abs/2111.13416
Publikováno v:
Icarus 2022, 373:114766, 0019-1035
Dust emission mechanisms as one aspect of wind-driven particle motion on planetary surfaces are still poorly understood. The microphysics is important though as it determines dust sizes and morphologies which set sedimentation speeds and optical prop
Externí odkaz:
http://arxiv.org/abs/2111.13402
Autor:
Jungmann, Felix, Wurm, Gerhard
Publikováno v:
A&A 650, A77 (2021)
Context. Particles in protoplanetary disks go through a number of phases that are dominated by collisions. In each of these events, grains exchange electrical charge via triboelectric effects. This enhances the stability of particle aggregates. Aim.
Externí odkaz:
http://arxiv.org/abs/2106.01081
Autor:
Schneider, Niclas, Musiolik, Grzegorz, Kollmer, Jonathan E., Steinpilz, Tobias, Kruss, Maximilian, Jungmann, Felix, Demirci, Tunahan, Teiser, Jens, Wurm, Gerhard
In protoplanetary disks, zones of dense particle configuration promote planet formation. Solid particles in dense clouds alter their motion through collective effects and back reaction to the gas. The effect of particle-gas feedback with ambient soli
Externí odkaz:
http://arxiv.org/abs/2103.03609
Collisions electrically charge grains which promotes growth by coagulation. We present aggregation experiments with three large ensembles of basalt beads ($150\,\mu\mathrm{m} - 180\,\mu\mathrm{m})$, two of which are charged, while one remains almost
Externí odkaz:
http://arxiv.org/abs/2101.09124
Autor:
Jungmann, Felix, Bila, Tetyana, Kleinert, Laura, Mölleken, Andre, Möller, Rolf, Schmidt, Lars, Schneider, Niclas, Teiser, Jens, Utzat, Detlef, Volkenborn, Victoria, Wurm, Gerhard
Publikováno v:
Icarus Volume 355, February 2021, 114127
In (pre)-planetary environments, dust and sand grains regularly collide. They electrically charge and discharge during these events. In this work, we study if cosmic radiation has any influence on the equilibrium charge state on timescales of minutes
Externí odkaz:
http://arxiv.org/abs/2010.04016
Autor:
Steinpilz, Tobias, Musiolik, Grzegorz, Kruss, Maximilian, Jungmann, Felix, Demirci, Tunahan, Aderholz, Manfred, Kollmer, Jonathan E., Teiser, Jens, Bila, Tetyana, Guay, Evelyn, Wurm, Gerhard
Publikováno v:
Review of Scientific Instruments, 90:10 (2019)
We developed an experiment to study different aspects of granular matter under microgravity. The 1.5U small experiment was carried out on the International Space Station. About 3500 almost identical spherical glass particles with 856 um diameter were
Externí odkaz:
http://arxiv.org/abs/1911.05429