Results 61 to 70 of about 82,273 (326)

The Blind Leading the Blind: The Battle of the St. Eloi Craters [PDF]

, 2012
The battle at St. Eloi between 27 March and 19 April 1916 was a minor side-show compared to the armageddon raging between the Germans and the French at Verdun.
Cook, Tim
core   +1 more source

Olivine or Impact Melt: Nature of the "Orange" Material on Vesta from Dawn

, 2013
NASA's Dawn mission observed a great variety of colored terrains on asteroid (4) Vesta during its survey with the Framing Camera (FC). Here we present a detailed study of the orange material on Vesta, which was first observed in color ratio images ...
Ammanito, E., Becker, K., Cloutis, E., De Sanctis, M., Denevi, B., Gaffey, M., Garry, W., Gaskell, R., Kneisl, T., Le Corre, L., Li, J., Mittlefehldt, D., Nathues, A., O'Brien, D., Palmer, E., Peplowski, P., Prettyman, T., Raymond, C., Reddy, V., Russell, C., Schmedemann, N., Sierks, H., Yamashita, N.   +22 more
core   +1 more source

Interfacial Energy and Composition Controlled Self‐Stratification in Polyurethane Coatings

Macromolecular Materials and Engineering, EarlyView.
This study elucidates self‐stratification in polyurethane coatings driven by interfacial energies and composition‐dependent phase separation. Using XPS, SIMS, and Raman analyses, we reveal rapid formation of hydrophobic and hydrophilic layers and substrate‐dependent interfacial structures.
Gaurav Singhal, Lihong Lao, Michaeleen L. Pacholski, Harshad Shah, Junsi Gu, Bryan Caruso, Fabio Aguirre‐Vargas, Piyush Singh, Kshitish A. Patankar, Simon A. Rogers, Charles M. Schroeder, Paul V. Braun   +11 more
wiley   +1 more source

The collisional evolution of undifferentiated asteroids and the formation of chondritic meteoroids [PDF]

, 2016
Most meteorites are fragments from recent collisions experienced in the asteroid belt. In such a hyper-velocity collision, the smaller collision partner is destroyed, whereas a crater on the asteroid is formed or it is entirely disrupted, too.
Beitz, Eike, Blum, Jürgen, Parisi, M. Gabriela, Trigo-Rodríguez, Josep M.   +3 more
core   +2 more sources

A Peridynamic Framework for Modeling Progressive Failure in Porous Sandstone Indentation

International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT A state‐based peridynamic model is proposed to simulate the failure mechanisms in porous rocks, using Bentheim sandstone as a specific example. Experimental observations reveal a transition from brittle to ductile failure under increasing triaxial compression. This behavior is attributed to pore compaction. The peridynamic model is enhanced to
Sahir N. Butt, Jörg Renner, Günther Meschke   +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

Effect of Designed 3D Reinforcement in Mitigating Machining Damage on CFRP Plates

Polymer Composites, EarlyView.
Effect of Edge Tufting on Surface Quality, Damage, and Mechanical Performance in CFRP Machining: A Comparative Topographical and Structural Analysis. ABSTRACT Composite materials made of carbon fiber‐reinforced epoxy (CFRP) are widely used in aerospace fields due to their high strength‐to‐weight ratio. However, due to low out‐of‐plane resistance, these
Thiago Luiz Lara Oliveira, Daniel Brighenti Bortoluzzi, Antônio Carlos Ancelotti Jr   +2 more
wiley   +1 more source

Speciation with gene flow

PLANTS, PEOPLE, PLANET, EarlyView.
Biodiversity is threatened by human activities, with extinction debt accumulating rapidly. Many of these activities change the connectivity of populations, fragmenting existing population systems or bringing previously isolated populations or species into contact.
Zhiqin Long, Xu Zhang, Yue Yu, Gregory L. Owens, Diana J. Rennison, Clarisse Palma‐Silva, Daniel Ortiz‐Barrientos, Loren H. Rieseberg   +7 more
wiley   +1 more source

From the Moon to Mercury: Release of Global Crater Catalogs Using Multimodal Deep Learning for Crater Detection and Morphometric Analysis

Remote Sensing
This study has compiled the first impact-crater dataset for Mercury with diameters greater than 400 m by a multimodal deep-learning pipeline. We present an enhanced deep learning framework for large-scale planetary crater detection, extending the ...
Riccardo La Grassa, Cristina Re, Elena Martellato, Adriano Tullo, Silvia Bertoli, Gabriele Cremonese, Natalia Amanda Vergara Sassarini, Maddalena Faletti, Valentina Galluzzi, Lorenza Giacomini   +9 more
doaj   +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