Results 31 to 40 of about 823 (174)
Scalar gravitation: A laboratory for numerical relativity. III. Axisymmetry [PDF]
Physical Review D, 1994 We construct a two-dimensional axisymmetric mean-field particle simulation scheme that solves the equations of relativistic scalar gravitation coupled to collisionless matter. Although scalar gravitation theory disagrees with experiment, it is useful as a testing ground for numerical methods used to solve the equations of general relativity ...
Scheel, Mark A. +2 more
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Superfluid Rivers in Spinning-down Neutron Stars
The Astrophysical Journal, 2023 We study the motion of neutron superfluid vortices in a spinning-down neutron star, assuming axisymmetry of the flow and ignoring the motion of vortices about the rotation axis.
Yuri Levin, Bennett Link
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The series solution to the metric of stationary vacuum with axisymmetry [PDF]
Chinese Physics B, 2010 18 pages, no ...
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Effect of Magnetic Islands on Neoclassical Heat Diffusivity in a Global Tokamak Simulation
Contributions to Plasma Physics, EarlyView.ABSTRACT Resonant magnetic perturbations (RMPs) alter magnetic field topology via island formation and can modify core transport in toroidal fusion devices. Using the global gyrokinetic particle‐in‐cell code XGC‐S, originally developed for stellarator geometries, we quantify how island topology affects neoclassical heat transport in a circular tokamak ...
Joseph X. Li +5 more
wiley +1 more source
Ultrarelativistic Bondi–Hoyle accretion – I. Axisymmetry [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 An ultrarelativistic relativistic study of axisymmetric Bondi--Hoyle accretion onto a moving Kerr black hole is presented. The equations of general relativistic hydrodynamics are solved using high resolution shock capturing methods. In this treatment we consider the ultrarelativistic limit wherein one may neglect the baryon rest mass density.
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From Planar to 3D Nanophotonic Lenses: Advancing Design, Fabrication, and Applications
Laser &Photonics Reviews, EarlyView.Three‐dimensional nanophotonic lenses are enabled by an integrated workflow that links design parameterization, full‐wave electromagnetic simulation, computational optimization, and freeform fabrication. This Review summarizes how these tools expand optical design freedom beyond a single patterned plane by enriching the local meta‐atom response and ...
Wei Zhu +2 more
wiley +1 more source
South African Journal of Chemical Engineering, 2022 Mathematical modeling is one of the efficient methods to improve the design of hemodialyzer and study affecting parameters on dialyzer performance.In this paper, mathematical modeling of hollow fiber dialyzer is done to investigate the effect of various ...
Mohammad Reza Goodarzi +1 more
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Arbitrary Lagrangian–Eulerian Formulation in a Rotating Frame to Model Friction Spinning
Proceedings in Applied Mathematics and Mechanics, Volume 26, Issue 4, December 2026.ABSTRACT Friction spinning is a metal forming process that can be used to manufacture various shapes by rotating a metallic workpiece relative to a blunt tool. When used as a hot metal forming process, the relative velocity between workpiece and tool is increased until substantial heat is generated due to friction.
Johannes Friedlein +3 more
wiley +1 more source
Preferred sunspot longitudes: non-axisymmetry and differential rotation [PDF]
Astronomy & Astrophysics, 2005 As recently found, the distribution of sunspots is non-axisymmetric and spot group formation implies the existence of two persistent active longitudes separated by 180 degrees. Here we quantitatively study the non-axisymmetry of sunspot occurrence. In a dynamic reference frame inferred from the differential rotation law, the raw sunspot data show a ...
Usoskin, I. G. +2 more
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Fortschritte der Physik, Volume 74, Issue 8, August 2026.ABSTRACT We analytically construct initial data for binary black hole systems by solving the Einstein constraint equations within the Bowen–York framework. Allowing for arbitrarily oriented linear momenta and spins, we obtain a perturbative solution of the vacuum Hamiltonian constraint up to third order in the source parameters. Our solution explicitly
Leyla Ogurol, Tore Boybeyi, Bayram Tekin
wiley +1 more source