Results 51 to 60 of about 9,183 (293)

MHD and deep mixing in evolved stars. 1. 2D and 3D analytical models for the AGB

, 2014
The advection of thermonuclear ashes by magnetized domains emerging from near the H-shell was suggested to explain AGB star abundances. Here we verify this idea quantitatively through exact MHD models. Starting with a simple 2D geometry and in an inertia
Busso, M., Nucci, M. C.
core   +1 more source

Possible Global Magneto-Fluid Structure of the Stellar Convection Zone [PDF]

Publications of the Astronomical Society of Japan, 2006
Structures of the magnetic field and velocity in stars are discussed based on the mean field MHD equations. A special case is presented, where the solution is constructed by the Beltrami solution in the stellar convection zone with the symmetry in the azimuthal direction. Magnetic field lines form concentric toroidal magnetic surfaces.
Itoh, Sanae I, Itoh, Kimitaka, Diamond, Patrick H, Yoshizawa, Akira   +3 more
openaire   +3 more sources

Convection Theory and Relevant Problems in Stellar Structure, Evolution, and Pulsational Stability I Convection Theory and Structure of Convection Zone and Stellar Evolution [PDF]

Frontiers in Astronomy and Space Sciences, 2021
A non-local and time-dependent theory of convection was briefly described. This theory was used to calculate the structure of solar convection zones, the evolution of massive stars, lithium depletion in the atmosphere of the Sun and late-type dwarfs, and stellar oscillations (in Part Ⅱ).
openaire   +2 more sources

Strategies for Loading and Releasing Peptide Therapeutics in Biodegradable Carriers

Advanced Functional Materials, EarlyView.
A biodegradable carrier‐based peptide delivery system is a powerful treatment platform for diverse diseases, owing to its superior therapeutic efficacy and low toxicity. This review examines the conventional peptide‐loaded carrier fabrication process and its current limitations.
Wookyoung Jang, Ki Wan Bong
wiley   +1 more source

Hydrodynamic simulations of shell convection in stellar cores

, 2011
Shell convection driven by nuclear burning in a stellar core is a common hydrodynamic event in the evolution of many types of stars. We encounter and simulate this convection (i) in the helium core of a low-mass red giant during core helium flash leading
A Chieffi, A Weiss, CA Meakin, CA Meakin, F Herwig, HJS Fernando, J Montalbán, L Siess, L Siess, M Mocák, M Mocák, N Iwamoto, NH Brummell, S Cassisi, SW Campbell, TM Brown   +15 more
core   +1 more source

On the role of recombination in common-envelope ejections [PDF]

, 2014
The energy budget in common-envelope events (CEEs) is not well understood, with substantial uncertainty even over to what extent the recombination energy stored in ionised hydrogen and helium might be used to help envelope ejection.
Ivanova, N., Justham, S., Podsiadlowski, Ph.   +2 more
core   +1 more source

Engineering Strategies for Stable and Long‐Life Alkaline Zinc‐Based Flow Batteries

Advanced Functional Materials, EarlyView.
Alkaline zinc‐based flow batteries face persistent challenges from unstable zinc deposition, including dendrite growth, passivation, corrosion, and hydrogen evolution, which severely limit cycling stability. Current research addresses these issues through coordinated electrode structuring, electrolyte regulation, and membrane design to control zinc ...
Yuran Bai, Xiaoyu Huo, Xin Long, Enkang Fu, Xusong Gong, Lei Wei, Liang An   +6 more
wiley   +1 more source

Fast and Slow Crystallization-driven Convection in White Dwarfs

The Astrophysical Journal
We investigate crystallization-driven convection in carbon–oxygen white dwarfs. We present a version of the mixing length theory that self-consistently includes the effects of thermal diffusion and composition gradients, and provides solutions for the ...
Matias Castro-Tapia, Andrew Cumming, J. R. Fuentes   +2 more
doaj   +1 more source

Rotation Reduces Convective Mixing in Jupiter and Other Gas Giants

The Astrophysical Journal Letters, 2023
Recent measurements of Jupiter’s gravitational moments by the Juno spacecraft and seismology of Saturn’s rings suggest that the primordial composition gradients in the deep interior of these planets have persisted since their formation.
J. R. Fuentes, Evan H. Anders, Andrew Cumming, Bradley W. Hindman   +3 more
doaj   +1 more source

Time-dependent Turbulence in Stars [PDF]

, 2010
Three-dimensional (3D) hydrodynamic simulations of shell oxygen burning (Meakin and Arnett 2007) exhibit bursty, recurrent fluctuations in turbulent kinetic energy.
Böhm-Vitense, Casey Meakin, Chandrasekhar, Cvitanović, Davidson, Gleick, Kjeldsen, Landau, Ledoux, Thompson, Unno, W. David Arnett   +11 more
core   +1 more source