Tootfinder

"Satellite images indicate that the Doñana Marshland will disappear within 60 years"
#Environment
https://phys.org/news/2026-02-satellite-images-doana-…

Satellite images indicate that the Doñana Marshland will disappear within 60 years
The Doñana National Park, considered one of Europe's most valuable wetlands, is expected to lose its marshland in 61 years, according to calculations from a major water-resource monitoring study carried out by the University of Seville. The study has developed an innovative algorithm, based on machine learning, capable of detecting the presence of surface water with high precision using images from the Sentinel-2 satellite.

Another day i #PowerBI - the data structure behind an API has changed rendering the dashboard useless. So, I'm making new API calls to be able to do new calculations in the data. Nothing from the original dashboard seems to work so it's back to square one.

Breit corrections to moderately charged ions in all-orders calculations
Andoni Skoufris, Benjamin M. Roberts
https://arxiv.org/abs/2602.17129 https://arxiv…

We're about 50/50 hosted/self-hosted on CI. Been doing a bit of napkin calculations, and it seems like our total GitHub CI bill will go down by a bit after this #github change. Of course, it reduces incentives to continue migrating workloads to self hosted actions.

Performance-wise, Safari on iOS apparently doesn’t seem to like the over-engineered CSS custom property calculations for fluid type and all the other stuff in my little style mixer. 🙈
But hey, my personal site is my playground, right? ¯\_(ツ)_/¯

Random #ThingUmbrella tip & tidbit about unit conversions: I've been sourcing materials for a larger contact printing setup for my kallitype process, incl. getting a much heavier ultra-clear glass plate than what I've been using so far.
Using the https://

Extensible SI unit creation, conversions, quantities & calculations (incl. ~170 predefined units & constants)

When asking someone to do something it's important to be clear about everything you are asking them to do, and when you are asking them to do it, up front.
Increasingly I'm asked to do something, I look at my schedule and other commitments and agree to the ask, and then weeks later am informed that "as part of X (what I agreed to) everyone is expected to do Y (something time consuming that wasn't mentioned before)" or "we need you to provide X (something necessary the day of the event) a week in advance (when there was no indication of this early deadline at the initial ask)".
This means that the calculations someone made regarding whether they could participate are based an incomplete understanding of what is required. That's not fair and it either results in forcing the participant to deprioritize something else or makes them push back on something they never agreed to and potentially withdraw.

Here's my tabulated preview of sky and space events (and round anniversaries) of the #NewYear, compiled from numerous sources and own calculations: https://skyweek.wordpress.com/2026/01/03/bedeutendes-am-himmel-im-jahr-2026/

Bound-electron self-energy calculations in Feynman and Coulomb gauges: detailed analysis
M. Reiter, E. Lazarev, D. Glazov, A. Malyshev
https://arxiv.org/abs/2512.15288 https://<…

@… belated thanks … I still don't understand the calculations, but I'm not precious about the UNIX philosophy.
I stumbled across my old toot whilst responding to a FreeBSD/Linux post, https://www.

Thermal one-loop self-energy correction for hydrogen-like systems: relativistic approach
M. Reiter, D. Solovyev, A. Bobylev, D. Glazov, T. Zalialiutdinov
https://arxiv.org/abs/2512.06828 https://arxiv.org/pdf/2512.06828 https://arxiv.org/html/2512.06828
arXiv:2512.06828v1 Announce Type: new
Abstract: Within a fully relativistic framework, the one-loop self-energy correction for a bound electron is derived and extended to incorporate the effects of external thermal radiation. In a series of previous works, it was shown that in quantum electrodynamics at finite temperature (QED), the description of effects caused by blackbody radiation can be reduced to using the thermal part of the photon propagator. As a consequence of the non-relativistic approximation in the calculation of the thermal one-loop self-energy correction, well-known quantum-mechanical (QM) phenomena emerge at successive orders: the Stark effect arises at leading order in $\alpha Z$, the Zeeman effect appears in the next-to-leading non-relativistic correction, accompanied by diamagnetic contributions and their relativistic refinements, among other perturbative corrections. The fully relativistic approach used in this work for calculating the SE contribution allows for accurate calculations of the thermal shift of atomic levels, in which all these effects are automatically taken into account. The hydrogen atom serves as the basis for testing a fully relativistic approach to such calculations. Additionally, an analysis is presented of the behavior of the thermal shift caused by the thermal one-loop correction to the self-energy of a bound electron for hydrogen-like ions with an arbitrary nuclear charge $Z$. The significance of these calculations lies in their relevance to contemporary high-precision experiments, where thermal radiation constitutes one of the major contributions to the overall uncertainty budget.
toXiv_bot_toot

Revealing Fast Ionic Conduction in Solid Electrolytes through Machine Learning Accelerated Raman Calculations
Manuel Grumet, Takeru Miyagawa, Olivier Pittet, Paolo Pegolo, Karin S. Thalmann, Waldemar Kaiser, David A. Egger
https://arxiv.org/abs/2511.21404

Hierarchical high-throughput screening of alkaline-stable lithium-ion conductors combining machine learning and first-principles calculations
Zhuohan Li, KyuJung Jun, Bowen Deng, Gerbrand Ceder
https://arxiv.org/abs/2511.20964

Ab initio calculations of the electronic structure of Ac
Genevieve Geehan, Marten Luit Reitsma, Johan David Polet, Mustapha Laatiaoui, Julian Berengut, Anastasia Borschevsky
https://arxiv.org/abs/2602.06528

Crosslisted article(s) found for physics.atom-ph. https://arxiv.org/list/physics.atom-ph/new
[1/1]:
- A quadratic-scaling algorithm with guaranteed convergence for quantum coupled-channel calculations
Hubert J. J\'o\'zwiak, Md Muktadir Rahman, Timur V. Tscherbul

Applicability of the Dirac-Fock method combined with Core Polarization in calculations of alkali atoms
A. A. Bobylev, J. J. Lopez-Rodriguez, P. A. Kvasov, M. A. Reiter, D. A. Solovyev, T. A. Zalialiutdinov
https://arxiv.org/abs/2601.21723