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- Kueppers, Michael, et al.
(författare)
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Triple F-a comet nucleus sample return mission
- 2009
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Ingår i: Experimental astronomy. - : Springer Science and Business Media LLC. - 0922-6435 .- 1572-9508. ; 23:3, s. 809-847
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Tidskriftsartikel (refereegranskat)abstract
- The Triple F (Fresh From the Fridge) mission, a Comet Nucleus Sample Return, has been proposed to ESA's Cosmic Vision program. A sample return from a comet enables us to reach the ultimate goal of cometary research. Since comets are the least processed bodies in the solar system, the proposal goes far beyond cometary science topics (like the explanation of cometary activity) and delivers invaluable information about the formation of the solar system and the interstellar molecular cloud from which it formed. The proposed mission would extract three sample cores of the upper 50 cm from three locations on a cometary nucleus and return them cooled to Earth for analysis in the laboratory. The simple mission concept with a touch-and-go sampling by a single spacecraft was proposed as an M-class mission in collaboration with the Russian space agency ROSCOSMOS.
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2. |
- Kempermann, G., et al.
(författare)
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Human Adult Neurogenesis: Evidence and Remaining Questions
- 2018
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Ingår i: Cell Stem Cell. - : Elsevier BV. - 1934-5909 .- 1875-9777. ; 23:1, s. 25-30
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Tidskriftsartikel (refereegranskat)abstract
- Renewed discussion about whether or not adult neurogenesis exists in the human hippocampus, and the nature and strength of the supporting evidence, has been reignited by two prominently published reports with opposite conclusions. Here, we summarize the state of the field and argue that there is currently no reason to abandon the idea that adult-generated neurons make important functional contributions to neural plasticity and cognition across the human lifespan.
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3. |
- Laue, Jan, et al.
(författare)
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Piles and shallow foundations under cyclic loadings
- 1997
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Ingår i: Proceedings of the International Offshore and Polar Engineering Conference. - Golden, CO : International Society of Offshore & Polar Engineers. ; , s. 803-810
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Konferensbidrag (refereegranskat)abstract
- To describe the soil structure-interaction of cyclic loaded structures, centrifuge model tests are carried out on laterally loaded piles and vertically loaded shallow foundations. The principle of deformation behaviour of sand will be with briefly. In addition to the presentation of the test results, possibilities of research on cyclic problems in the Bochum geotechnical centrifuge are presented. The obtained data from centrifuge model tests under dry conditions is related to foundations of coastal and offshore structures. It is shown, that the observed mechanisms have to be regarded even in saturated conditions too. The evaluated data is compared with the results and equations obtained from cyclic and dynamic triaxial tests. Thus, the differences between element tests and the real soil-structure interaction behaviour are established.
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