Tootfinder

American voters: https://mastodon.org.uk/@mkwadee/114859158529749965

Clapping propulsion and thin vortex rings: a computational study of vortex dynamics, energy equivalence, and core potential energy
Suyog V. Mahulkar, Jaywant H. Arakeri
https://arxiv.org/abs/2507.11491

Clapping propulsion and thin vortex rings: a computational study of vortex dynamics, energy equivalence, and core potential energy
We present a numerical study on clapping propulsion using a body consisting of two rigid plates hinged at one end, with a 60-degree interplate cavity. The closing of the cavity generates a thrust-producing jet. Our previous experimental study (Mahulkar and Arakeri, PRF, 2024) compared the flow fields of the clapping body in two cases: free-moving (dynamic) and forward-constrained (stationary). The experiments revealed significant differences in body motion and flow structures. This numerical st…

A former OpenAI engineer details his experience working at the company, including its culture, engineering practices, rapid growth, and the launch of Codex (Calvin French-Owen)
https://calv.info/openai-reflections

Reflections on OpenAI

Cam Ward gives thanks to dad, who drove him all over Texas to help him reach his dreams https://www.espn.com/nfl/story/_/id/45493280/tennessee-titans-qb-cameron-ward-fathers-day-message-calvin

Questions about the meaning of #artificialintelligence and its implications for human dignity and well-being highlighted a major conference at YDS last month, titled, “A.I. and the Ends of Humanity: Thinking Theologically After ChatGPT.” Full story by Timothy Cahill '16 M.A.R.

#Canada Charter #Rights turn out to be useless against #police overreach

Boundary rigidity of systolic and Helly complexes
Mart\'in Blufstein, J\'er\'emie Chalopin, Victor Chepoi
https://arxiv.org/abs/2506.13219 http…

Boundary rigidity of systolic and Helly complexes
In this article, we prove that finite (weakly) systolic and Helly complexes can be reconstructed from their boundary distances (computed in their 1-skeleta). Furthermore, Helly complexes and 2-dimensional systolic complexes can be reconstructed by an algorithm that runs in polynomial time with respect to the number of vertices of the complex. Both results can be viewed as a positive contribution to a general question of Haslegrave, Scott, Tamitegama, and Tan (2025). The reconstruction of a fini…

40 years ago this afternoon, the #GratefulDead on the beach in ventura, closing out the 1st half of their summer shows, a glorious day on the ocean. early summer ’85, show #14. BASTILLE YOUR FACE.
soundboard (some more clipping bass):

LocalSend is a GodSend

Accretion from a Shock-Inflated Companion: Spinning Down Neutron Stars to Hour-Long Periods
Savannah Cary, Wenbin Lu, Calvin Leung, Tin Long Sunny Wong
https://arxiv.org/abs/2507.10682

Accretion from a Shock-Inflated Companion: Spinning Down Neutron Stars to Hour-Long Periods
Recent observations have unveiled a population of pulsars with spin periods of a few minutes to hours that lie beyond the traditional ``death line.'' If they originate from neutron stars (NSs), the existence of such ultra-long period pulsars (ULPs) challenges our current understanding of NS evolution and emission. In this work, we propose a new channel for disk formation based on NSs born in close binaries with main-sequence companion stars. Using a hydrodynamic simulation of supernova-companio…