Results 41 to 50 of about 635 (114)

Widespread effusive volcanism on Mercury likely ended by about 3.5 Ga

Geophysical Research Letters, 2016
Crater size–frequency analyses have shown that the largest volcanic plains deposits on Mercury were emplaced around 3.7 Ga, as determined with recent model production function chronologies for impact crater formation on that planet.
Paul K. Byrne, Lillian R. Ostrach, Caleb I. Fassett, Clark R. Chapman, Brett W. Denevi, Alexander J. Evans, Christian Klimczak, Maria E. Banks, James W. Head, Sean C. Solomon   +9 more
doaj   +1 more source

Global case studies of soft-sediment deformation structures (SSDS): Definitions, classifications, advances, origins, and problems

Journal of Palaeogeography, 2017
Soft-sediment deformation structures (SSDS) have been the focus of attention for over 150 years. Existing unconstrained definitions allow one to classify a wide range of features under the umbrella phrase “SSDS”.
G. Shanmugam
doaj   +1 more source

Ray and Halo Impact Craters on Ganymede: Fingerprint for Decoding Ganymede's Crustal Structure

Earth and Space Science
Impact craters are a unique tool not only for inferring ages of planetary surfaces and examining geological processes, but also for exploring subsurface properties.
N. R. Baby, T. Kenkmann, K. Stephan, R. J. Wagner, E. Hauber   +4 more
doaj   +1 more source

Experimental and Numerical Simulation of Ejecta Size and Velocity of Hypervelocity Impact Rubble-Pile Asteroid

Aerospace
Rubble-pile asteroids may be the type of near-Earth object most likely to threaten Earth in a future collision event. Small-scale impact experiments and numerical simulations for large-scale impacts were conducted to clarify the size ratio of the boulder/
Wenjin Liu, Qingming Zhang, Renrong Long, Jiankang Ren, Juncheng Li, Zizheng Gong, Qiang Wu, Siyuan Ren   +7 more
doaj   +1 more source

Unusual corona texture around olivine in Chang’e-5 regolith formed by impact process on the Moon

Earth, Planets and Space
Impact-cratering is a ubiquitous geologic process on the Moon. The impact-induced mineralogical micro-structures in lunar sample can provide information about their formation conditions on the Moon.
Haojin Hu, Xiaojia Zeng, Jingwen Liu, Yanxue Wu, Yuanyun Wen, Xiongyao Li, Jianzhong Liu   +6 more
doaj   +1 more source

Primary and secondary metallic PFC damage induced by runaway electron dissipation in FTU

Nuclear Materials and Energy
Runaway electron (RE) interaction with plasma-facing components (PFCs) has been documented to lead to deep volumetric melting and thermal shock driven material explosions followed by extensive wall cratering.
M. De Angeli, P. Tolias, S. Ratynskaia, D. Ripamonti, M. Iafrati, G. Maddaluno, G. Daminelli, E. Fortuna-Zalesna   +7 more
doaj   +1 more source

Study on the high-speed penetration resistance of honeycomb tube surface constrained concrete

Baozha yu Chongji
To investigate the penetration resistance of metal honeycomb tube-confined concrete structures under hypervelocity impact, penetration experiments were conducted using a two-stage light gas gun with projectile velocities near 1500 m/s. The material point
Xiaochen LI, Yuguo JI, Chao LI, Jie LI, Haiming JIANG, Mingyang WANG, Gan LI   +6 more
doaj   +1 more source

A Flat-bottomed Buried Crater and Paleo-layered Structures Revealed at the Von Kármán Crater Using Lunar Penetrating Radar

The Astrophysical Journal Letters
Impact cratering is the most common geological process occurring on terrestrial planets. The morphologies of impact craters reflect not only the impact conditions but the target properties as well.
Ling Zhang, Xindong Meng, Yuqi Qian, Yi Xu, Xiaoping Zhang, Zhipeng Liu, Jialong Lai, Rui Gao   +7 more
doaj   +1 more source

Normal high velocity solid dust impacts on tiles of tokamak-relevant temperature

Nuclear Materials and Energy
Runaway electron incidence on plasma facing components triggers explosive events that are accompanied by the expulsion of fast solid debris. Subsequent dust-wall high speed impacts constitute a mechanism of wall damage and dust destruction.
Marco De Angeli, Panagiotis Tolias, Francisco Suzuki-Vidal, Dario Ripamonti, Tim Ringrose, Hugo Doyle, Giambattista Daminelli, Jay Shadbolt, Peter Jarvis, Monica De Angeli   +9 more
doaj   +1 more source

Experimental and Numerical Simulation Research on Penetration Resistance of Prestressed Reinforced Concrete Structure

Yuanzineng kexue jishu
Prestressed reinforced concrete structures are still the commonly used structural form for containment buildings in large pressurized water reactor nuclear power plants.
LIU Mengsha,  GAO Ge,  JIANG Di
doaj   +1 more source