Results 91 to 100 of about 40,348 (289)

On Energetic Electron Precipitation in Auroral Arcs

Geophysical Research Letters
Abstract A key element of magnetosphere‐ionosphere coupling is the precipitation of electrons, which transfers energy from the collisionless, rarefied magnetospheric plasma into the dense, collisional ionosphere. Two distinct types of such precipitation are: auroral electrons, which carry field‐aligned currents and are responsible for
Anton Artemyev, Yukitoshi Nishimura, Xiao‐Jia Zhang, Vassilis Angelopoulos   +3 more
openaire   +1 more source

Evidence of sub-MeV EMIC-driven electron precipitation [PDF]

, 2017
Electromagnetic ion cyclotron (EMIC) waves are potentially important drivers of the loss of energetic electrons from the radiation belts. Numerous theoretical calculations exist with conflicting predictions of one of the key parameters: the minimum ...
Aaron T. Hendry, Craig J. Rodger, Evans D. S., Mark A. Clilverd   +3 more
core   +2 more sources

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

High temporal resolution observations of auroral electron density using superthermal electron enhancement of Langmuir waves

Geophysical Research Letters, 2016
We report high temporal resolution auroral electron precipitation observations using the Sondrestrom incoherent scatter radar. The observations make use of the superthermal electron enhancement of Langmuir waves, which is shown to give accurate ...
Juha Vierinen, Asti Bhatt, Michael A. Hirsch, Anja Strømme, Joshua L. Semeter, Shun‐Rong Zhang, Philip J. Erickson   +6 more
doaj   +1 more source

On the radar frequency dependence of polar mesosphere summer echoes

Earth and Planetary Physics, 2020
Polar mesosphere summer echoes (PMSEs) are very strong radar echoes in the polar mesopause in local summer. Here we present the frequency dependence of the volume reflectivity and the effect of energetic particle precipitation on modulated PMSEs by using
ShuCan Ge, HaiLong Li, Lin Meng, MaoYan Wang, Tong Xu, Safi Ullah, Abdur Rauf, Abdel Hannachid   +7 more
doaj   +1 more source

Tribological Performance of 60NiTi Alloy Under Varying Contact Conditions and Elevated Temperatures in Linear Reciprocating Sliding

Advanced Engineering Materials, EarlyView.
This study investigates the tribological response of 60NiTi alloy under dry, water‐lubricated and high‐temperature conditions. The alloy exhibits decreasing wear volume and friction with increasing temperature due to the formation of protective oxide layers. The work clarifies dominant wear mechanisms and demonstrates the suitability of 60NiTi for high‐
Anthony Onyebuchi Okoani, Miguel Angel Selles, Maziar Ramezani   +2 more
wiley   +1 more source

Microburst precipitation of energetic electrons associated with chorus wave generation [PDF]

Geophysical Research Letters, 2010
Electron microbursts, which are short‐duration (<1 sec) bursts of energetic electrons that precipitate into the Earth's atmosphere, comprise an important loss process from the outer radiation belt. By means of a self‐consistent full‐particle simulation, we show that microburst precipitation of electrons of energies 10 keV–100 keV accompanies the ...
Hikishima, Mitsuru, Omura, Yoshiharu, Summers, Danny   +2 more
openaire   +1 more source

Characterization of Nitinol Produced by Laser Powder Bed Fusion for Mechanical Metamaterial Applications

Advanced Engineering Materials, EarlyView.
Stabilization of L‐PBF Ni50.7Ti49.3 under low‐cycle loading was investigated. Recoverable strain after cycling was dependent on the amount of applied load. Recovery ratio was 53.4% and 35.1% at intermediate and high load, respectively. The maximum total strain reached 10.3% at a high load of 1200 MPa.
Ondřej Červinek, Jakub Hurník, Miroslav Šmíd, Ondřej Zobač, Melanie Todt, Daniel Koutný   +5 more
wiley   +1 more source

Modeling inward diffusion and slow decay of energetic electrons in the Earth\u27s outer radiation belt [PDF]

, 2015
A new 3-D diffusion code is used to investigate the inward intrusion and slow decay of energetic radiation belt electrons (\u3e0.5 MeV) observed by the Van Allen Probes during a 10 day quiet period on March 2013.
Angelopoulos, V., Baker, D. N., Blake, J. B., Claudepierre, S., Fennell, J. F., Henderson, M. G., Hospodarsky, G. B., Kletzing, C A., Kurth, W. S., Li, W., Ma, Q., Ni, B., Reeves, Geoffrey, Spence, Harlan E., Thorne, R. M.   +14 more
core   +4 more sources

Nanoindentation Criteria for Combinatorial Thin Film Libraries

Advanced Engineering Materials, EarlyView.
Thin‐film material libraries are compositional spreads used for screening composition‐structure‐property relationships. Nanoindentation is often used to characterize mechanical behavior across these systems, however variations in methodology are widespread.
Andre Bohn, Adie Alwen, Andrea M. Hodge
wiley   +1 more source