Results 31 to 40 of about 35,040 (307)

Effect of Laser Deoxidation on Adhesive‐Bonded Aluminum in an Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
This study investigates laser ablation of aluminum under oxygen‐free conditions. The goal is to produce oxide‐free substrates that enable improved adhesive bonding with epoxy. Optimized laser parameters (90% overlap, 300 µJ) combined with oxide‐free substrates result in the highest tensile strength of the adhesive bond.
Sandra Gerland, Finn‐Lennard Janthur, Sarah Seffer, Jörg Hermsdorf, Ludger Overmeyer, Annika Raatz   +5 more
wiley   +1 more source

Multi-Platform Integrated Analysis of the Degradation Patterns of Impact Crater Populations on the Lunar Surface

Remote Sensing
Following the processing of the Chang’e-4 satellite images, Chang’e-4 landing camera images, and Yutu-2 panoramic camera images, data were obtained in a variety of resolutions, including digital elevation model (DEM) and digital orthophoto map (DOM).
Meixi Chen, Xinyu Ma, Teng Hu, Zhizhong Kang, Meng Xiao   +4 more
doaj   +1 more source

The effect of the oceans on the terrestrial crater size-frequency distribution: Insight from numerical modeling

, 2007
From the proceedings of the Workshop on Impact Craters as Indicators for Planetary Environmental Evolution and Astrobiology held in June 2006 in Östersund, Sweden.On Earth, oceanic impacts are twice as likely to occur as continental impacts, yet the ...
Amsden, Artemieva, Artemieva, Baldwin, Bland, Bland, Bland, Bottke, Collins, Collins, Collins, Collins, Dalwigk, Dence, Gault, Grieve, Halliday, Ivanov, Ivanov, Ivanov, Ivanov, Kyte, Melosh, Melosh, Nemtchinov, O'Keefe, Oberbeck, Ormö, Ormö, Ormö, Poag, Poag, Schmidt, Shuvalov, Shuvalov, Shuvalov, Shuvalov, Wünnemann, Wünnemann, Wünnemann, Wünnemann   +40 more
core   +1 more source

Low-speed impact craters in loose granular media [PDF]

, 2003
We report on craters formed by balls dropped into dry, non-cohesive, granular media. By explicit variation of ball density $\rho_{b}$, diameter $D_{b}$, and drop height $H$, the crater diameter is confirmed to scale as the 1/4 power of the energy of the ...
D. J. Durian, H. J. Melosh, J. Amato, J. Duran, J. S. Uehara, M. A. Ambroso, M. E. van Valkenburg, R. Bagnold, R. P. Ojha, R. L. Brown, S. Savage   +10 more
core   +3 more sources

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source

An Updated Catalog of Rayed Craters on Mars

Earth and Space Science, 2023
Martian meteorites represent the only samples of Mars available for study in terrestrial laboratories. In addition to their crystallization and surface ejection ages, these samples provide a detailed understanding of the geochemistry of the martian crust.
Jennifer K. Harris, Lauren E. McKeown, Carlotta Parenti, Livio L. Tornabene, Peter M. Grindrod   +4 more
doaj   +1 more source

Copper Nanocrystallization in Anodic Oxide Films of Ti–Cu‐Based Bulk Metallic Glass and Its Effect on the Corrosion Resistance and Cytocompatibility

Advanced Engineering Materials, EarlyView.
Viktoriia Shtefan, Thorgund Nemec, Ute Hempel, Annett Gebert and coworkers demonstrate that anodic treatment of Ti–Cu‐based metallic glass in a nontoxic pyrophosphate electrolyte forms a protective bilayered Ti/Zr‐oxide film enriched with Cu nanocrystals.
Viktoriia Shtefan, Nora Fernández Navas, Thorgund Nemec, Ivan Kaban, Ute Hempel, Andrea Voss, Volker Hoffmann, Darius Pohl, Annett Gebert   +8 more
wiley   +1 more source

Popigai and Chicxulub craters: multiple impacts and their associated grabens [PDF]

Solid Earth
More advanced data (gravity field model EIGEN 6C4 including the GOCE gradiometry data instead of EGM 2008) and a more sophisticated method (using a set of gravity aspects instead of gravity anomalies and the radial second derivative of the disturbing ...
J. Klokočník, V. Cílek, J. Kostelecký, J. Kostelecký, A. Bezděk   +4 more
doaj   +1 more source

Photocatalytic Water Splitting on the Lunar Surface: Prospects for In Situ Resource Utilization

Advanced Materials Interfaces, EarlyView.
Water has been found in craters on the moon nearby locations which are illuminated >80% of the time. Photocatalysis uses energy from sunlight to drive chemical reactions such as water splitting to produce oxygen and hydrogen. It is a scalable technology that requires lighter equipment and utilizes resources available on the moon. ABSTRACT The discovery
Ranjani Kalyan, Thomas D. Small, Gregory F. Metha, Mahmoud Adel Hamza, Thomas J. O'Dea, Yideng Shen, Cameron J. Shearer   +6 more
wiley   +1 more source

Impact Crater Morphometry on Pluto: Implications for Surface Composition and Evolution

The Planetary Science Journal, 2023
New Horizons showed that Pluto exhibits a wide range of geologic groups, with much of the surface modified by volatile ice processes. Impact craters are a valuable tool to investigate how these regions have evolved, as they record the effects of various ...
Joshua E. Hedgepeth, Catherine D. Neish, Veronica J. Bray   +2 more
doaj   +1 more source