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The slender body free boundary problem
Laurel Ohm
https://arxiv.org/abs/2509.16800 https://arxiv.org/pdf/2509.16800…

The slender body free boundary problem
We consider the slender body free boundary problem describing the evolution of an inextensible, closed elastic filament immersed in a Stokes fluid in $\mathbb{R}^3$. The filament elasticity is governed by Euler-Bernoulli beam theory, and the coupling between this 1D elasticity law and the surrounding 3D fluid is governed by the slender body Neumann-to-Dirichlet (NtD) map, which treats the filament as a 3D object with constant cross-sectional radius $0<ε\ll1$. This map serves as a mathematical …

Determining the magnetic field of active region plages using the whole CLASP2/2.1 spectral window
David Afonso Delgado, Tanaus\'u del Pino Alem\'an, Javier Trujillo Bueno, Ryohko Ishikawa, Ernest Alsina Ballester, David E. McKenzie, Luca Belluzzi, Christian Bethge, Ken Kobayashi, Takenori J. Okamoto, Laurel A. Rachmeler, Donguk Song, Ji\v{r}\'i \'St\v{e}p\'an, Bart de Pontieu, Adam R. Kobelski, Genevieve D. Vigil, Fr\'ed\'eric Auch\`ere, Ryouhei Kano, Amy Wi…

Determining the magnetic field of active region plages using the whole CLASP2/2.1 spectral window
The Chromospheric LAyer SpectroPolarimeter missions, CLASP2 and CLASP2.1, demonstrated that the near-UV spectral region between 279.30 and 280.68 nm is suitable for studying the magnetism of the solar chromosphere. In particular, the spectropolarimetric observations in the Mg II h and k resonant doublet, Mn I 279.91 and 280.19 nm resonant lines, and Fe II 279.79 and 280.66 nm lines acquired by these suborbital space experiments have been proven useful for inferring the magnetic field stratifica…

Acabo de escribir "diables" en neutro, ese que no le gusta a los señoros de la RAE ni a los derechuzos y al leerlo me ha parecido tan bien puesto que no lo voy a corregir. A fin de cuentas ¿quién sabe qué sexo tienen los diables?

„Roland Kern vom Dachverband für Kinder- und Schülerläden erklärt sich die sinkende Nachfrage in den Innenstadtbezirken mit den steigenden Mieten. Viele könnten sich keine Wohnung für Ihre Familie leisten“
https://www.rbb24.de/panorama/beitrag/2025

🇺🇦 Auf radioeins läuft...
Cocteau Twins:
🎵 Lorelei
#NowPlaying #CocteauTwins
https://micahtewersofficial.bandcamp.com/track/lorelei-cocteau-twins
https://open.spotify.com/track/1ZnXuijpwEBjhNxpEnb8WH

🇺🇦 #NowPlaying on BBCRadio3's #NightTracks
Laurel Halo:
🎵 Sweat, Tears or the Sea
#LaurelHalo
https://open.spotify.com/track/2yDsCkPGERKJisaIQQvmaC

A hierarchy of blood vessel models, Part I: 3D-1D to 1D
Laurel Ohm, Sarah Strikwerda
https://arxiv.org/abs/2507.13316 https://arxiv.o…

A hierarchy of blood vessel models, Part I: 3D-1D to 1D
We propose and analyze a family of models describing blood perfusion through a tissue surrounding a thin blood vessel. Our goal is to rigorously establish convergence results among 3D-3D Darcy--Stokes, 3D-1D Darcy--Poiseuille, and 1D Green's function methods commonly used to model this process. In Part I, we propose a 3D-1D Darcy--Poiseuille system where the coupling across the permeable vessel surface involves an angle-averaged Neumann boundary condition coupled with a geometrically constraine…

A hierarchy of blood vessel models, Part II: 3D-3D to 3D-1D and 1D
Laurel Ohm, Sarah Strikwerda
https://arxiv.org/abs/2507.13330 https://

A hierarchy of blood vessel models, Part II: 3D-3D to 3D-1D and 1D
We propose and analyze a hierarchy of three models of blood perfusion through a tissue surrounding a thin arteriole or venule. Our goal is to rigorously link 3D-3D Darcy--Stokes, 3D-1D Darcy--Poiseuille, and 1D Green's function methods commonly used to model this process. Here in Part II, we consider the most detailed level, a 3D-3D Darcy-Stokes system coupled across the permeable vessel surface by mass conservation and pressure/stress balance conditions. We derive a convergence result between …