Results 91 to 100 of about 35,040 (307)

Largest impact craters on Venus [PDF]

High-resolution radar images from the Magellan spacecraft have allowed us to perform a detailed study on 25 large impact craters on Venus with diameters from 70 to 280 km.
Basilevsky, A. T., Ivanov, B. A., Weitz, C. M.   +2 more
core   +1 more source

Projectile Interactions in Granular Impact Cratering

Physical Review Letters, 2008
We present evidence for the interactions between a ball and the container boundaries, as well as between two balls, that are mediated by the granular medium during impact cratering. The presence of the bottom boundary affects the final penetration depth only for low drop heights with shallow filling, in which case, surprisingly, the penetration becomes
Katsuragi, Hiroaki, Nelson, E. L., Durian, Douglas J., Mayor, Patrick   +3 more
openaire   +5 more sources

A Tool for Prioritizing Gravel Augmentation Reaches for Sediment Starved Rivers

River Research and Applications, EarlyView.
ABSTRACT Gravel augmentation is a widely used restoration technique used to improve habitat below dams, including salmonids spawning habitat. However, gravel augmentation can be cost‐prohibitive, and it is often unclear which stream segments have the highest potential to benefit spawning salmonids.
Patricia J. Wohner, Peter A. Samarin, James T. Peterson   +2 more
wiley   +1 more source

Impact craters on Venus: An overview from Magellan observations [PDF]

Magellan has revealed an ensemble of impact craters on Venus that is unique in many important ways. We have compiled a database describing 842 craters on 89 percent of the planet's surface mapped through orbit 2578 (the craters range in diameter from 1.5
Boyce, J. M., Chadwick, D. J., Dawson, D. D., Gaddis, L. R., Kirk, R. L., Moore, H. J., Russell, J., Schaber, G. G., Soderblom, L. A., Strom, R. G.   +9 more
core   +1 more source

Solvent‐Induced Surface Morphology Probed by NP‐SIMS

Surface and Interface Analysis, EarlyView.
ABSTRACT Surface morphology, that is, roughness and molecular arrangement, is known to have an impact on secondary ion mass spectra. The present study examines this issue using nanoprojectile secondary ion mass spectrometry (NP‐SIMS). NP‐SIMS involves bombarding the analyte with individual nanoparticles resolved in space and time and recording the ...
Pierre Hirchenhahn, Stanislav Verkhoturov, Michael Eller, Wilson Serem, Yordanos Bisrat, Emile A. Schweikert   +5 more
wiley   +1 more source

Bright crater outflows: Possible emplacement mechanisms [PDF]

Lobate features with a strong backscatter are associated with 43 percent of the impact craters cataloged in Magellan's cycle 1. Their apparent thinness and great lengths are consistent with a low-viscosity material.
Chadwick, D. John, Duval, Darla M., Schaber, Gerald G., Strom, Robert G.   +3 more
core   +1 more source

Sampling, Mobility, and Anchoring in Small‐Body Sampling Robots: A Comprehensive Review

SmartBot, EarlyView.
Small‐body sampling robots are exploration systems that perform contact, sampling, and stable operations on microgravity bodies such as asteroids and comets. The authors review representative robot architectures and key technologies, focusing on the mechanisms, evolution, and coupling of sampling, mobility, and anchoring.
Yurui Shen, Yixin Zhu, Mingxia Bao, Ting Zhang, Jun Wu, Jingbin Hao, Dezheng Hua, Xinhua Liu   +7 more
wiley   +1 more source

Crater Equilibrium State Characterization given Crater Production from a Single Power Law

The Planetary Science Journal
We generalize the crater equilibrium concept, a terminal state on a cratered surface where the balance of crater production and erasure apparently limits the crater population from further growth. Assuming the crater production consists of a single power
Masatoshi Hirabayashi, Caleb I. Fassett, Emily S. Costello, David A. Minton   +3 more
doaj   +1 more source

Tailoring Laser Powder Bed Fusion and Post‐Processing Parameters for JIS SKD61 Tool Steels: Surface Roughness, Microstructure, and Mechanical Properties

steel research international, EarlyView.
Laser powder bed fusion of JIS SKD61 tool steel is systematically optimized using a Taguchi design and ANOVA. Hatch spacing and layer thickness are identified as dominant parameters controlling surface roughness and tensile strength. Subsequent tempering at 600°C improves microstructural stability and mechanical performance, enabling high‐density SKD61
Masrurotin Masrurotin, Andi Ard Maidhah, Maziar Ramezani, Wojciech Macek, Cho‐Pei Jiang   +4 more
wiley   +1 more source

Melt production in large-scale impact events: Implications and observations at terrestrial craters [PDF]

The volume of impact melt relative to the volume of the transient cavity increases with the size of the impact event. Here, we use the impact of chondrite into granite at 15, 25, and 50 km s(sup -1) to model impact-melt volumes at terrestrial craters in ...
Cintala, Mark J., Grieve, Richard A. F.
core   +1 more source