Tootfinder

"Minneapolis police officers reprimanded for misconduct in aftermath of George Floyd's murder"
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#policemisconduct

Minneapolis officers reprimanded for misconduct in 2020 after George Floyd’s murder
Newly published discipline reports reveal that former police chiefs moved to terminate two officers for excessive force and suspended others for failing to uphold department policy.

Laser wakefield acceleration of ions with a transverse flying focus
Zheng Gong, Sida Cao, John P. Palastro, Matthew R. Edwards
https://arxiv.org/abs/2405.02690

Laser wakefield acceleration of ions with a transverse flying focus
The extreme electric fields created in high-intensity laser-plasma interactions could generate energetic ions far more compactly than traditional accelerators. Despite this promise, laser-plasma accelerators have remained stagnant at maximum ion energies of 100 MeV/nucleon for the last twenty years. The central challenge is the low charge-to-mass ratio of ions, which has precluded one of the most successful approaches used for electrons: laser wakefield acceleration. Here we show that a laser p…

Tailoring the Nucleation and Growth of Silver Nanoparticles by Sputtering Deposition under Acoustic Wave Activation. Assessment of Plasma Conditions and 2D Patterning Phenomena
Helene Reichel, Aurelio Garcia-Valenzuela, Jose Andres Espino-Roman, Jorge Gil-Rostra, Guillermo Fernando Regodon, Victor Rico-Gavira, Ana Borras, Ana Gomez-Ramirez, Alberto Palmero, Agustin R. Gonzalez-Elipe, Manuel Oliva-Ramirez

Tailoring the Nucleation and Growth of Silver Nanoparticles by Sputtering Deposition under Acoustic Wave Activation. Assessment of Plasma Conditions and 2D Patterning Phenomena
Early results on the plasma deposition of dielectric thin films on acoustic wave (AW) activated substrates revealed a densification pattern arisen from the focusing of plasma ions and their impact on specific areas of the piezoelectric substrate. Herein, we extend this methodology to tailor the plasma deposition of metals onto AW-activated LiNbO3 piezoelectric substrates. Our investigation reveals the tracking of the initial stages of nanoparticle (NP) formation and growth during the submonolay…

This https://arxiv.org/abs/2404.19193 has been replaced.
initial toot: https://mastoxiv.page/@a…

Tunable Collective Excitations in Epitaxial Perovskite Nickelates
The formation of plasmons through the collective excitation of charge density has generated intense discussions, offering insights to fundamental sciences and potential applications. While the underlying physical principles have been well-established, the effects of many-body interactions and orbital hybridization on plasmonic dynamics remain understudied. In this work, we present the observation of conventional metallic and correlated plasmons in epitaxial La1-xSrxNiO3 (LSNO) films with varyin…

This https://arxiv.org/abs/2311.07450 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Quark production and thermalization of the quark-gluon plasma
We first assemble a full set of the Boltzmann Equation in Diffusion Approximation (BEDA) for studying thermalization/hydrodynamization as well as the production of massless quarks and antiquarks in out of equilibrium systems. In the BEDA, the time evolution of a generic system is characterized by the following space-time dependent quantities: the jet quenching parameter, the effective temperature, and two more for each quark flavor that describe the conversion between gluons and quarks/antiquar…

This https://arxiv.org/abs/2402.08091 has been replaced.
initial toot: https://mastoxiv.page/@a…

Earth's Alfvén wings driven by the April 2023 Coronal Mass Ejection
We report a rare regime of Earth's magnetosphere interaction with sub-Alfvénic solar wind in which the windsock-like magnetosphere transforms into one with Alfvén wings. In the magnetic cloud of a Coronal Mass Ejection (CME) on April 24, 2023, NASA's Magnetospheric Multiscale mission distinguishes the following features: (1) unshocked and accelerated cold CME plasma coming directly against Earth's dayside magnetosphere; (2) dynamical wing filaments representing new channels of magnetic connec…

Recently I've added a cheap hack to the standard #Gentoo invocation for #PyTest to throw errors if unhandled async functions are detected. The goal was to increase our chances of finding packages with missing dependency on dev-python/pytest-asyncio (or another equivalent plugin), or packages disabling plugin autoloading and failing to load such a plugin.
Today, I've gotten a first bug report, regarding dev-python/ipython. I've grepped the sources and confirmed that the package depends on PyTest-AsyncIO, except that it pins to < 0.22. Well, we don't have one that old but let's hope it works anyway. So I've tried adding the dep, `-p asyncio`… and PyTest still apparently couldn't find the plugin. I've scratched my head and tried `PYTEST_PLUGINS` instead — still the same result. What the…?
So I've checked the git repository out, tried with older PyTest-AsyncIO, and indeed the tests worked. Tried with the newest, 0.23.6, and the same issue occurred. I've checked the git history and discovered that the version pin was added because of a buggy 0.22.0 release. However, the issue has been fixed since, the release was yanked and my problem was nothing like that.
So I've investigated more. For some reason, #IPython test suite does not mark tests with `pytest.mark.asyncio` marker directly. Instead, it globally iterates over all test functions, and implicitly adds the marker to all coroutines. This used to work with older versions, but does not work anymore — the test is correctly marked, but for some reason it stops being recognized as a coroutine. So I've made a minimal reproducer and filed a bug.
The key point here is: the (potential) bug went unnoticed for a while now, because of the premature, then obsolete pin in IPython.
#Python

Direct, simple, and efficient computation of all components of the virtual-casing magnetic field in axisymmetric geometries with Kapur-Rokhlin quadrature
Evan Toler, Antoine Cerfon, Dhairya Malhotra
https://arxiv.org/abs/2404.02799

Direct, simple, and efficient computation of all components of the virtual-casing magnetic field in axisymmetric geometries with Kapur-Rokhlin quadrature
In a recent publication (Toler et al. 2023), we demonstrated that for axisymmetric geometries, the Kapur-Rokhlin quadrature rule provided an efficient and high-order accurate method for computing the normal component, on the plasma surface, of the magnetic field due to the toroidal current flowing in the plasma, via the virtual-casing principle. The calculation was indirect, as it required the prior computation of the magnetic vector potential from the virtual-casing principle, followed by the …

Pinpointing Lattice-Matched Conditions for Wurtzite ScxAl1-xN/GaN Heterostructures with X-Ray Reciprocal Space Analysis
Rajendra Kumar, Govardan Gopakumar, Zain Ul Abdin, Michael J. Manfra, Oana Malis
https://arxiv.org/abs/2406.01540

Pinpointing Lattice-Matched Conditions for Wurtzite ScxAl1-xN/GaN Heterostructures with X-Ray Reciprocal Space Analysis
Using comprehensive x-ray reciprocal space mapping, we establish the precise lattice-matching composition for wurtzite $Sc_xAl_{1-x}N$ layers on (0001) GaN to be x = 0.14+/-0.01. 100-nm thick $Sc_xAl_{1-x}N$ films (x = 0.09 - 0.19) were grown in small composition increments on c-plane GaN templates by plasma-assisted molecular beam epitaxy. The alloy composition was estimated from the fit of the (0002) x-ray peak positions assuming the c-lattice parameter of ScAlN films coherently-strained on G…

Direct, simple, and efficient computation of all components of the virtual-casing magnetic field in axisymmetric geometries with Kapur-Rokhlin quadrature
Evan Toler, Antoine Cerfon, Dhairya Malhotra
https://arxiv.org/abs/2404.02799

Direct, simple, and efficient computation of all components of the virtual-casing magnetic field in axisymmetric geometries with Kapur-Rokhlin quadrature
In a recent publication (Toler et al. 2023), we demonstrated that for axisymmetric geometries, the Kapur-Rokhlin quadrature rule provided an efficient and high-order accurate method for computing the normal component, on the plasma surface, of the magnetic field due to the toroidal current flowing in the plasma, via the virtual-casing principle. The calculation was indirect, as it required the prior computation of the magnetic vector potential from the virtual-casing principle, followed by the …