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Secretary of State Marco Rubio convened representatives from 66 different nations on July 16
for a “ministerial meeting” on the resurgence of “political terrorism.”
The White House described the summit as the launch of “an unprecedented global offensive against the transnational threat of Radical Left terrorism.”
This historic occasion took the form of Rubio, White House Deputy Chief of Staff Stephen Miller, and Treasury Secretary Scott Bessent taking turns as they said Na…

@arXiv_physicsappph_bot@mastoxiv.page
2026-07-22 08:03:29

The Butterfly Defect Effect in Cylindrical Shell Buckling: Non-localized Interactions of Localized Imperfections
Uba K. Ubamanyu, Antoine Blond, John W. Hutchinson, Pedro M. Reis
arxiv.org/abs/2607.19245 arxiv.org/pdf/2607.19245 arxiv.org/html/2607.19245
arXiv:2607.19245v1 Announce Type: new
Abstract: We investigate the buckling of axially compressed cylindrical shells containing localized defects, focusing on interactions among multiple defects and between them and the shell edges. Using high-fidelity finite-element simulations, we first characterize the parameter space of single-dimple sensitivity, defect-edge coupling, and pairwise defect-defect interactions. Building on this deterministic baseline, we run stochastic simulations of shells with randomly distributed imperfections whose amplitudes are sampled from a log-normal distribution. Post-buckling deformations form non-axisymmetric, butterfly-shaped patterns whose `wings' reach far across the shell surface. This spatial extent induces unavoidable interactions with neighboring defects and the clamped edges, so that buckling is not necessarily initiated by the deepest defect. A larger defect population raises the likelihood of an extreme defect, producing a statistical size effect: as the mean number of defects grows, the mean knockdown factor decreases asymptotically and its variability decays exponentially. The butterfly defect effect qualitatively explains the scatter in historical experimental data by correlating the knockdown factor with the cylinder length-to-thickness ratio ($H/t$) rather than the radius-to-thickness ratio ($R/t$) alone, thereby establishing $H$ as a key parameter for stability alongside $R$ and $t$. Nonetheless, the knockdown factors obtained here remain well above those reported in historical experiments, indicating that the localized Gaussian dimple, though nearly the worst-case imperfection for spherical shells, is not so for cylinders.
toXiv_bot_toot

@davidaugust@mastodon.online
2026-06-17 18:13:30

"…Every filthy stupid thing that happens is happening in the open, now: Captains of industry line up to shake Trump's hand at…big birthday party he threw for himself…every new blast of rank & ancient bigotry or proudly pig-stupid backwardness arrives w/o euphemism or qualification. Trump is not just figuratively walling himself off from…DC, & glowering down at its residents, he is literally doing all those things."

@sonnets@bots.krohsnest.com
2026-06-01 11:25:11

Sonnet 049 - XLIX
Against that time, if ever that time come,
When I shall see thee frown on my defects,
When as thy love hath cast his utmost sum,
Called to that audit by advis'd respects;
Against that time when thou shalt strangely pass,
And scarcely greet me with that sun, thine eye,
When love, converted from the thing it was,
Shall reasons find of settled gravity;
Against that time do I ensconce me here,
Within the knowledge …

@bici@mastodon.social
2026-05-06 21:46:55

AI products are defective and dangerous. Why are we using them at all?
theglobeandmail.com/business/c

@@arXiv_physicsatomph_bot@mastoxiv.page@mastoxiv.page
2026-06-02 07:56:38

Theory for the Rydberg states of helium: quantum defect extensions and comparison with experiment up to $n = 102$ for the singlet and triplet $P$-states
G. W. F. Drake, Aaron T. Bondy
arxiv.org/abs/2606.00814

Monday's killing in Biddeford Maine
—at least the 11th that agents of the nation's anti-immigrant death squads have committed in the U.S. since the start of Donald Trump's crackdown
—has been met with public outrage,
but nothing indicates that the federal government thinks anything went wrong at all.
As is its custom, ICE told lies about its victim, calling Duršn Guerrero an "illegal alien" in its statement
and suggesting that agents slaught…

I would go as far as to say maybe just don't retweet Elon Musk at all,
but what do I know?
I'm not the vice president of communications for the Milwaukee Brewers.
Tyler Barnes is, and on Tuesday he popped onto Twitter after a two-year hiatus to weigh in on British politics
by retweeting Elon Musk's white genocide propaganda.

Donald Trump has a hang-up about Pluto.
As far back as 2019, his appointed NASA administrator was making noise about reclassifying it as a planet,
a status it lost when in 2006 the International Astronomical Union created a new system of nomenclature for all those weird and wacky bodies hurtling around the sun.
Pluto, long a staple of the Big Nine and a famous childhood acrostic, was now a "mere" dwarf planet.
Trump's back on his weird horse again, makin…