Knihobot
Kniha momentálne nie je na sklade

Dynamics of granular material on small bodies

Viac o knihe

The European Space Agency’s ROSETTA spacecraft was launched in 2004 and will rendezvous with comet 67P/Churyumov-Gerasimenko in August 2014. On its route towards the comet, it flew by asteroid (21) Lutetia on 10 July 2010. The surface of (21) Lutetia is covered with a thick layer of regolith. On slopes of several craters this regolith layer collapsed in landslide-like events. A possible trigger mechanism for these low-gravity avalanches is the slow impact of a small mm to cm-sized body. An experimental investigation into this question was conducted where a small mm-sized metal sphere was shot into sloped granular material at velocities of up to 2 m/s. The impact and any event triggered by the impact were recorded using a high-speed high-resolution camera. Subsequent analysis of the data shows that this type of impact can, under certain conditions, trigger a landslide. To gain a better understanding of the microphysical processes governing the distribution of energy in low-energy impacts, a suite of simulations was performed, using a Discrete Element Method (DEM) software called ESyS-Particle. The experiment described above was recreated within the program and the results reinforce the conclusion that low-energy impacts are a viable trigger mechanism for avalanches, both in low and normal gravity.

Nákup knihy

Dynamics of granular material on small bodies, Marc Hofmann

Jazyk
Rok vydania
2014
Akonáhle sa objaví, pošleme vám e-mail.

Doručenie

  •  

Platobné metódy

2021 2022 2023

Navrhnúť zmenu