@heiseonline@social.heise.de2026-08-22 13:38:04
Mega-Fahrzeugrückruf in China: Tesla und weitere Marken betroffen
Tesla und weitere Autobauer müssen Millionen Fahrzeuge in China zurückrufen. Es gab Tote und Verletzte wegen elektrischen Türgriffen.
https…
@arXiv_physicsappph_bot@mastoxiv.page2026-07-22 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
https://arxiv.org/abs/2607.19245 https://arxiv.org/pdf/2607.19245 https://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
@tinoeberl@mastodon.online2026-09-22 14:16:01
#Speicherkapazität der #Batteriespeicher in #Deutschland je Netzanschlussebene ab 2012 mit Stand vom 31.08.2026.
Betrachtet werden Datensätze mit Betriebsstatus „aktiv“…
@niqdanger@social.linux.pizza2026-08-22 16:51:18
This guy got in the house somehow and had to be relocated outside.
@heiseonline@social.heise.de2026-09-21 13:03:04
@theodric@social.linux.pizza2026-08-22 07:30:37
trying to reconstruct the non-Euclidean matryoshka of your current btrfs volume is not worth the advantages btrfs ostensibly provides. I am THIS -> <- CLOSE to just reinstalling on XFS rather than trying to migrate the existing system.
@nobodyinperson@fosstodon.org2026-09-17 15:20:26
I'm in the process of converting an mdadm RAID10 to a btrfs RAID10 while preserving the data. My current strategy is:
· ✅ 1 of the 4 disks − btrfs
· ✅ enlarge that disk with another random btrfs disk
· ⏳ copy the 6TB borg repo from the remaining 3 mdadm disks to the new small btrfs pool
· ❓`borg check` the copied backup
· ❓ 3 mdadm disks − btrfs
· ❓ add all to btrfs pool
· ❓ let pool balance
· ❓ remove the random disk again
So far it's b…
@heiseonline@social.heise.de2026-07-23 14:04:35
Die Rheinenergie baut direkt am Rhein Europas größte Flusswasser-Wärmepumpe, die ab 2028 in Betrieb gehen soll.
Zum Artikel: https://heise.de/-11374308?wt_mc=sm.red.ho.mastodon.mastodon.md_beitraege.md_beitraege&utm_source=m…
@heiseonline@social.heise.de2026-08-24 06:25:23
Ein Detail, das Leben kosten kann: Elektrische Türgriffe in E-Autos. China hat jetzt die Reißleine gezogen und ordnet den größten Rückruf des Jahres an. Allein drei Millionen Teslas sind betroffen. 😳
Zum Artikel: https://heise.de/-11422793?wt_mc=sm.re
@heiseonline@social.heise.de2026-09-21 15:07:03
LMU: Angreifer hat sich bisher nicht bei Uni gemeldet
Nach der Attacke auf die LMU gibt es bisher keine Kontaktaufnahme des Täters. Einem Bericht zufolge könnten Zehntausende betroffen sein.
https://www.
