Results 81 to 90 of about 14,324 (302)

Direct observations of coherent backscatter of radar waves in precipitation

, 2010
In previous work, it was argued that a source of radar coherent scatter occurs in the direction perpendicular to the direction of wave propagation because of the presence of grids of enhanced particle concentrations with spatial periodicities in ...
A. R. Jameson, Jameson, A. R., A. B. Kostinski, Kostinski, A. B.   +3 more
core   +1 more source

Globally coherent water cycle response to temperature change during the past two millennia

, 2023
The response of the global water cycle to changes in global surface temperature remains an outstanding question in future climate projections and in past climate reconstructions.
Konecky, Bronwen L., Divine, Dmitry V., Sicre, Marie-Alexandrine, McKay, Nicholas P., Moy, Andrew D., Stevenson, Samantha L., Leduc, Guillaume, Incarbona, Alessandro, Martrat, Belen, Conroy, Jessica L., Abram, Nerilie J., DeLong, Kristine L., Klaebe, Robert M., von Gunten, Lucien, Yoshimura, Kei, Sicre, Marie Alexandrine, Fischer, Matt J., Kolus, Hannah R., Jones, Matthew D., Curran, Mark A., Kaufman, Darrell S., Managave, Shreyas R., Jonkers, Lukas, Sayani, Hussein R., Comas-Bru, Laia, Dee, Sylvia G., Churakova (Sidorova), Olga V., Braun, Kerstin, Orsi, Anais J., Thompson, Diane M., Porter, Trevor J., Tyler, Jonathan J., Dassié, Emilie P., Roop, Heidi A., Falster, Georgina M., Skrzypek, Grzegorz, Deininger, Michael, Thomas, Elizabeth K., Kaushal, Nikita, Kern, Zoltán, Atwood, Alyssa R., Opel, Thomas, Partin, Judson W., Mortyn, P. Graham, Cartapanis, Olivier, Carré, Matthieu, Iso2k Project Members   +46 more
core   +1 more source

Creep‐Induced Microstructural Evolution in an A2‐B2 Superalloy

Advanced Engineering Materials, EarlyView.
A 27.3Ta‐27.3Mo‐27.3Ti‐8Cr‐10Al (at.%) refractory high‐entropy alloy with precipitation‐strengthened A2‐B2 microstructure was studied by creep tests at 1030°C, which demonstrate a transition in deformation mechanisms in the range of 100–150 MPa applied stress. This is associated with changes in dislocation–precipitate interactions. Relevant deformation
Liu Yang, Aparajita Pramanik, Sandipan Sen, Shubhashis Dixit, Marcel Muench, R. J. Vikram, Daniel Schliephake, Yolita M. Eggeler, Ankur Chauhan, Martin Heilmaier, Alexander Kauffmann   +10 more
wiley   +1 more source

Investigation of the relationship between optical auroral forms and HF radar E region backscatter [PDF]

, 2000
International audienceThe SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L-shell aligned features in the auroral E region.
Milan, S. E., N. Sato, Lester, M., H. Takizawa (7612496), Villain, J.-P., J. -p. Villain, Takizawa, H., M. Lester, N. Sato (7606136), Milan, S.E., S. E. Milan, Stephen E. Milan (7612220), J. P. Villain (7612424), J.-P. Villain, Mark Lester (6477935), Sato, N., H. Takizawa   +16 more
core   +1 more source

Strain-relief by single dislocation loops in calcite crystals grown on self-assembled monolayers

Nature Communications, 2016
Epitaxial crystal growth attracts significant interest. Here, the authors use Bragg Coherent Diffraction Imaging to demonstrate calcite crystal precipitation on self-assembled monolayers exhibiting single dislocation loops with different geometries to ...
Johannes Ihli, Jesse N. Clark, Alexander S. Côté, Yi-Yeoun Kim, Anna S. Schenk, Alexander N. Kulak, Timothy P. Comyn, Oliver Chammas, Ross J. Harder, Dorothy M. Duffy, Ian K. Robinson, Fiona C. Meldrum   +11 more
doaj   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

Observation of coherent oxide precipitates in polycrystalline MgB2 [PDF]

Applied Physics Letters, 2002
Here we describe the results of an atomic resolution study of oxygen incorporation into bulk MgB2. We find that ∼20–100 nm sized precipitates are formed by ordered substitution of oxygen atoms onto boron lattice sites, while the basic bulk MgB2 crystal structure and orientation is preserved.
Klie, R. F., Idrobo, J. C., Browning, N. D., Serquis, A. C., Zhu, Y. T., Liao, X. Z., Mueller, F. M.   +6 more
openaire   +2 more sources

Origin of energetic electron precipitation >30 keV into the atmosphere [PDF]

, 2010
Energetic electrons are deposited into the atmosphere from Earth's inner magnetosphere, resulting in the production of odd nitrogen (NOx). During polar night, NOx can be transported to low altitudes, where it can destroy ozone, affecting the atmospheric ...
Lam, Mai Mai, Moffat-Griffin, Tracy, Green, Janet C., Glauert, Sarah A., Horne, Richard B., Meredith, Nigel P.   +5 more
core   +1 more source

Experimental Characterization and Constitutive Modeling of the Effect of Prior Inelastic Strain on the Viscoplastic Behavior of AD730 at 700 °C

Advanced Engineering Materials, EarlyView.
This study shows that superalloys used in aircraft engine disks become much more prone to deformation at high temperatures if they have been strained during manufacturing. This effect increases with the level of prior strain but eventually reaches a limit.
Fabio Machado Alves da Fonseca, Patrick Villechaise, Malik Durand, Arnaud Longuet, Florent Coudon, Loïc Signor, Julien De Jaeger, Dominique Eyidi, Nathalie Bozzolo, Jonathan Cormier   +9 more
wiley   +1 more source

A detailed exploration of microstructure evolution in a novel Ti–Mo martensitic steel through in-situ observation: The effect of heating rate

Journal of Materials Research and Technology
Rapid heating is a promising technique for achieving excellent mechanical properties. This study innovatively applies rapid heating to a novel Ti–Mo martensite steel through in-situ observation experiments.
Qing Yuan, Jiaxuan Mo, Jie Ren, Wen Liang, Guang Xu   +4 more
doaj   +1 more source