@heiseonline@social.heise.de2026-10-05 12:12:03
Chemnitzer Linux-Tage 2027: Der Termin steht
Nun steht das Datum der Veranstaltung fest: Die Chemnitzer Linux-Tage 2027 finden am 20. und 21. März 2027 statt.
https://www.heise.de/news/Chemnitzer-L…
@arXiv_mathDS_bot@mastoxiv.page2026-08-05 08:01:42
Pattern formation: reactivity is not necessary for chemotaxis--driven instabilities
Angela Monti
https://arxiv.org/abs/2608.03685 https://arxiv.org/pdf/2608.03685 https://arxiv.org/html/2608.03685
arXiv:2608.03685v1 Announce Type: new
Abstract: A classical result by Neubert, Caswell and Murray states that reactivity of a spatially homogeneous equilibrium is a necessary condition for diffusion-driven (Turing) instability. In this work, we investigate whether the same conclusion remains valid in the presence of chemotaxis. We consider a general reaction--diffusion system coupled with a chemotactic flux and establish necessary conditions for asymptotic instability. We show that the classical requirement of reactivity can be relaxed when the chemotactic contribution is sufficiently strong. In particular, while reactivity remains necessary for Turing instability, it is not a necessary condition for chemotaxis-driven instability. From a computational viewpoint, we extend the matrix-oriented formulation developed for reaction--diffusion systems to the more general class of reaction--diffusion--chemotaxis models. The chemotactic transport term is discretized in a form compatible with the matrix-oriented approximation of the diffusion operator, yielding an efficient numerical framework for the simulation of chemotaxis-driven pattern formation. A geometric interpretation of the instability region is presented, highlighting the distinct roles played by diffusion and chemotaxis. The theoretical and numerical developments are illustrated through two representative examples: a chemotaxis-extended Schnakenberg model, showing how chemotaxis modifies classical Turing patterns, and a predator--prey model, demonstrating that chemotaxis alone can induce pattern formation in the absence of both reactivity and diffusion-driven instability. These results reveal a fundamental difference between diffusion-driven and chemotaxis-driven mechanisms of spatial self-organization and provide new theoretical and computational insights into the role of non-symmetric transport processes in biological pattern formation.
toXiv_bot_toot
@chrysn@chaos.social2026-10-05 15:41:13
Dragging myself through unfinished bank and tax stuff, I published a helper script I use at <https://codeberg.org/chrysn/camt2csv>: It converts the banks' camt.053 XML into something easier to use, and at the same time does some checks for continuity.
Because imagine, if banks just referen…
@NFL@darktundra.xyz2026-10-05 20:20:23
NFL suspends two officials for 'unprofessional conduct' toward players during Sunday's games https://www.nfl.com/news/nfl-suspends-two-officials-unprofessional-conduct-with-players-week-4
@cowboys@darktundra.xyz2026-10-05 23:11:38
Cowboys CB, Safety snap counts v Texans: How much Porter, Speed played https://cowboyswire.usatoday.com/story/sports/nfl/cowboys/2026/10/05/cowboys-snap-counts-week-4-texans-malik-hooker-joey-porter-jr/…
@raiders@darktundra.xyz2026-10-05 16:40:34
Raiders Week 4 snap counts vs Chiefs: Cody White gets big promotion https://raiderswire.usatoday.com/story/sports/nfl/raiders/2026/10/05/raiders-week-4-snap-counts-chiefs-cody-white-big-promotion/921045950…
@netzschleuder@social.skewed.de2026-09-04 04:00:04
contact: Haggle human proximity network (2006)
A network of human proximities, as measured by carried wireless devices. Each node represents a person, and an edge denotes when two people were within a certain proximity of each other, as measured by a wireless protocol (Bluetooth or Wifi). The edges are timestamped.
This network has 274 nodes and 28244 edges.
Tags: Social, Offline, Unweighted, Timestamps
@Techmeme@techhub.social2026-08-05 11:25:57
Shopify reports Q2 revenue up 34% YoY to $3.6B, above $3.45B est., GMV up 32% YoY to $115.6B, and forecasts Q3 revenue above est.; SHOP jumps 30% pre-market (Deborah Sophia/Reuters)
https://www.reuters.com/business/canadas-shopify-for…
@NFL@darktundra.xyz2026-10-04 19:01:52
Patriots coach Mike Vrabel flagged for unsportsmanlike conduct, then Bills score https://www.nytimes.com/athletic/7659856/2026/10/04/mike-vrabel-unsportsmanlike-conduct-penalty-patriots-bills/
@netzschleuder@social.skewed.de2026-09-05 18:00:05
contact: Haggle human proximity network (2006)
A network of human proximities, as measured by carried wireless devices. Each node represents a person, and an edge denotes when two people were within a certain proximity of each other, as measured by a wireless protocol (Bluetooth or Wifi). The edges are timestamped.
This network has 274 nodes and 28244 edges.
Tags: Social, Offline, Unweighted, Timestamps
