Results 61 to 70 of about 2,051 (189)

The Second Life of Cobalt MOF: Alternating Magnetic Field‐ Assisted Electrocatalytic Oxygen Evolution Reaction in MOF‐derived Nanoparticles

open access: yesSmall, EarlyView.
This study investigates the effect of an alternating magnetic field (AMF) on carbon‐supported cobalt nanoparticles for enhanced electrocatalytic performance in the oxygen evolution reaction (OER). Key factors such as AMF strength, electrolyte composition and concentration, and cobalt content are analyzed, revealing significant efficiency improvements ...
Jose Luis del Rio‐Rodríguez   +11 more
wiley   +1 more source

Magnetohydrodynamic simulation code CANS+: Assessments and applications [PDF]

open access: yesPublications of the Astronomical Society of Japan, 2019
Abstract We present a new magnetohydrodynamic (MHD) simulation package with the aim of providing accurate numerical solutions to astrophysical phenomena where discontinuities, shock waves, and turbulence are inherently important. The code implements the Harten–Lax–van Leer–discontinuitues (HLLD) approximate Riemann solver, the fifth ...
Jin Matsumoto   +11 more
openaire   +3 more sources

Non-thermal broadening of IRIS Fe XXI line caused by turbulent plasma flows in the magnetic reconnection region during solar eruptions

open access: yesFrontiers in Astronomy and Space Sciences, 2023
Magnetic reconnection is the key mechanism for energy release in solar eruptions, where the high-temperature emission is the primary diagnostic for investigating the plasma properties during the reconnection process.
Chengcai Shen   +7 more
doaj   +1 more source

Double Auroral Undulation During the Main Phase of the May 10–11, 2024 Storm

open access: yesAGU Advances, Volume 6, Issue 4, August 2025.
Abstract We report the discovery of a new type of aurora, namely, double auroral undulation that occurred simultaneously on both equatorward and poleward edges of the duskside auroral oval during the main phase of the May 10–11, 2024 superstorm. Whereas the equatorward auroral undulation (EAU) has been frequently observed and well known, the poleward ...
Yongliang Zhang   +3 more
wiley   +1 more source

A General Relativistic Magnetohydrodynamic Simulation of Jet Formation

open access: yesThe Astrophysical Journal, 2005
We have performed a fully three-dimensional general relativistic magnetohydrodynamic (GRMHD) simulation of jet formation from a thin accretion disk around a Schwarzschild black hole with a free-falling corona. The initial simulation results show that a bipolar jet (velocity $\sim 0.3c$) is created as shown by previous two-dimensional axisymmetric ...
Gerald J. Fishman   +7 more
openaire   +3 more sources

TWO-DIMENSIONAL MAGNETOHYDRODYNAMIC SIMULATIONS OF BARRED GALAXIES [PDF]

open access: yesThe Astrophysical Journal, 2012
Barred galaxies are known to possess magnetic fields that may affect the properties of bar substructures such as dust lanes and nuclear rings. We use two-dimensional high-resolution magnetohydrodynamic (MHD) simulations to investigate the effects of magnetic fields on the formation and evolution of such substructures as well as on the mass inflow rates
Woong-Tae Kim, James M. Stone
openaire   +4 more sources

Unveiling the Global Characteristics of Turbulence in the Venusian Space Environment

open access: yesGeophysical Research Letters, Volume 52, Issue 14, 28 July 2025.
Abstract Turbulence plays a crucial role in energy transfer from large to small scales in solar wind‐Venus interaction. Observations have identified magnetic field fluctuations and turbulence in the Venusian space environment. However, due to limited observations and simulation resolutions, neither the global characteristics nor the driving mechanisms ...
Tong Dang   +8 more
wiley   +1 more source

Influence of Low Magnetic Fields on Hydrogen Evolution Reaction Performance of NiCoP Electrocatalysts

open access: yesChemPhysChem, Volume 26, Issue 14, July 18, 2025.
Herein, electrocatalytic activity enhancement is reported of NiCoP nanorods by applying an external magnetic field. The NiCoP nanorods exhibit an overpotential of 100 mV at 10 mA cm−2 without magnetic field. However, under low magnetic field of 2000 G, the overpotential reduces to 62 mV at 10 mA cm−2 in 0.5 M H2SO4, demonstrating that external magnetic
Vishwanath Ankalgi   +7 more
wiley   +1 more source

Magnetohydrodynamic simulation of an equatorial dipolar paleomagnetosphere [PDF]

open access: yesJournal of Geophysical Research: Space Physics, 2004
During polarity reversals of the Earth's internal geomagnetic field, the paleomagnetosphere must have undergone dramatic changes because the core field was essentially different from the present‐day case, where the dipole moment is approximately aligned with the Earth's rotation axis (axial dipole) and perpendicular to the solar wind flow. According to
Tamas I. Gombosi   +4 more
openaire   +3 more sources

Magnetized Accretion onto Neutron Stars: From Photon-trapped to Neutrino-cooled Flows

open access: yesThe Astrophysical Journal
When a neutron star (NS) intercepts gas from a nondegenerate star, e.g., in a tidal disruption event, a common-envelope phase, or the collapsing core of a massive star, photons become trapped in the hot flow around the NS.
Luciano Combi   +4 more
doaj   +1 more source

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