Tootfinder

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@cosmos4u@scicomm.xyz
2026-02-26 19:08:41

As reported in http://www.cbat.eps.harvard.edu/iau/cbet/005600/CBET005664.txt the main belt #asteroid (44) #Nysa is showing "an unusual, highly concave, possibly bilobate, shape" in #LBT images - and https://groups.io/g/mpml/message/41424 now adds that the observer describes the object on the so far unpublished pictures as a "freaky little space guy" ...

@tante@tldr.nettime.org
2026-01-26 12:14:59

Das wird sicher keinen Einfluss haben darauf, wie in Deutschland Forschung gefördert wird.
Eine CSU Ministerin würde niemals so shady shit abziehen.

Screenshot des Instagram Accounts von Doro Bär (BMFTR) mit dem Statement: "Die strikte Trennung zwischen zivil und militärisch ist eindeutig überholt - ebenso wie die Zivilklauseln an Universitäten"

@arXiv_physicsfludyn_bot@mastoxiv.page
2026-02-27 08:23:00

Acoustic Signatures of Pinch-Off Cavities During Water-Entry
Zirui Liu, Tongtong Ding, Mingyue Kuang, Zimeng Li, Junyi Zhao, A-Man Zhang, Shuai Li
https://arxiv.org/abs/2602.22761 https://arxiv.org/pdf/2602.22761 https://arxiv.org/html/2602.22761
arXiv:2602.22761v1 Announce Type: new
Abstract: This study experimentally, numerically, and theoretically investigates the cavity/bubble dynamics and radiated acoustics during the water entry of a centimeter-scale cylindrical projectile with a conical nose. Experiments were conducted in a laboratory tank, employing synchronized high-speed imaging and hydrophone measurements to characterize the cavity closure modes and their resultant acoustic signatures across a range of Froude numbers. The acoustic signal features a weak radiated signal upon impact, followed by significant pressure oscillations spanning more than 20 cycles in the flow field after cavity elongation and pinch-off. A numerical model based on the Finite Volume Method (FVM) successfully captures these physical processes. Subsequently, a semi-theoretical model that incorporates the projectile's boundary effect is developed from potential flow theory. The model not only yields a dominant cavity oscillation frequency that agrees well with experimental data, but also reveals that the boundary effect leads to a cavity oscillation frequency markedly higher than the Minnaert frequency of an equivalent-volume ellipsoidal bubble containing an internal rigid core. The dominant cavity frequency falls nearly linearly with Fr, governed by nose geometry and projectile inertia. This study clarifies the underlying physics connecting cavity dynamics during water entry to underwater acoustic radiation.
toXiv_bot_toot

@roland@devdilettante.com
2026-01-25 23:25:54

When I see The Pitt flashbacks to the mentor dying of COVID, I think about my Auntie Baby (RIP) in the Philippines dying of COVID in spring of 2020. She had the best care money could buy there (USA trained doctors and equipment courtesy of my wealthy cousin) but no anti-virals and no vaccines.