Results 71 to 80 of about 345 (250)
The Astrophysical JournalThere is now a large sample of stars observed by the Kepler satellite with measured rotation periods and photometric activity index S _ph . We use this data, in conjunction with stellar interiors models, to explore the interplay of magnetism, rotation ...
Savita Mathur +18 more
doaj +1 more source
The Radiation Environment of Exoplanet Atmospheres
Challenges, 2014 Exoplanets are born and evolve in the radiation and particle environment created by their host star. The host star’s optical and infrared radiation heats the exoplanet’s lower atmosphere and surface, while the ultraviolet, extreme ultraviolet and X ...
Jeffrey L. Linsky
doaj +1 more source
Mixing‐Driven Defects and Composition Evolution in Multi‐Material Metal Additive Manufacturing
Advanced Science, EarlyView.Operando synchrotron X‐ray imaging coupled with high‐fidelity multiphysics modeling uncovers how inter‐material mixing reshapes keyhole dynamics and drives distinct pore‐formation pathways in multi‐material laser powder bed fusion (LPBF). Composition‐dependent instabilities trigger defects, whereas rescanning suppresses porosity and homogenizes Cu ...
Zhilang Zhang +5 more
wiley +1 more source
The Astrophysical JournalThe nonlinear coupling between stellar convection and rotation is of great interest because it relates to understanding both stellar evolution and activity. We investigate the influence of rotation and the Coriolis force on the dynamics and thermodynamic
Irina N. Kitiashvili +2 more
doaj +1 more source
Opacity Effects on Pulsations of Main-Sequence A-Type Stars
Atoms, 2018 Opacity enhancements for stellar interior conditions have been explored to explain observed pulsation frequencies and to extend the pulsation instability region for B-type main-sequence variable stars.
Joyce A. Guzik +2 more
doaj +1 more source
Advanced Science, EarlyView.Inspired by biological ion transport, this work introduces self‐powered multifunctional sensors utilizing tailored hydrogel stacks. Optimizing ionic migration with MXenes and carbon nanotubes achieves high‐performance energy harvesting and unique logic circuit functionality.
Haoran Chen +9 more
wiley +1 more source
3D Simulations of Semiconvection in Spheres: Turbulent Mixing and Layer Formation
The Astrophysical JournalSemiconvection occurs in regions of stars and planets that are unstable to overturning convection according to the Schwarzschild criterion, but stable according to the Ledoux criterion.
J. R. Fuentes
doaj +1 more source
Sub‐Terahertz Memristor Switches Using MoS2 by Liquid–Liquid Interface Assembly
Advanced Science, EarlyView.This work introduces application‐ready sub‐terahertz memristor switches fabricated from electrochemically exfoliated MoS2 nanosheets assembled at a liquid–liquid interface. The devices exhibit robust unipolar resistive switching, low insertion loss, and high isolation across 10–110 GHz.
Tomás Mingates +15 more
wiley +1 more source
Anelastic Magnetohydrodynamic Equations for Modeling Solar and Stellar Convection Zones
The Astrophysical Journal Supplement Series, 1999 The anelastic approximation has strong advantages for numerical simulations of stellar and solar convection zones. The chief and generally known one is that it suppresses acoustic modes, permitting larger simulated time steps to be taken than would be possible in a fully compressible model.
S. R. Lantz, Y. Fan
openaire +1 more source
Effects of rotation and surface forcing on deep stellar convection zones
Proceedings of the International Astronomical Union, 2023 AbstractThe canonical undestanding of stellar convection has recently been put under doubt due to helioseismic results and global 3D convection simulations. This “convective conundrum” is manifested by much higher velocity amplitudes in simulations at large scales in comparison to helioseismic results, and the difficulty in reproducing the solar ...
openaire +2 more sources