May 2026 - NumPI - Mailing list — Dipartimento di Matematica, UniPI

Fwd: Reminder: dealii-X Seminar Tuesday at 14:00
by Fabio Durastante 05 May '26

05 May '26

Good morning, I apologize for the short notice. Below is an announcement for an online seminar for the Deal.II-X project* (of which some of us are members) for this afternoon (May 5th) at 2:00 PM. The topic might be of interest. Best regards, Fabio * https://www.dealii-x.eu/ -------- Messaggio Inoltrato -------- Oggetto: Reminder: dealii-X Seminar Tuesday at 14:00 Data: Mon, 4 May 2026 21:09:46 +0200 Mittente: 'Ivan Prusak' via dealiix project <dealiix-project(a)vph-institute.org> Rispondi-a: Ivan Prusak <ivan.prusak(a)rub.de> A: dealiix-project(a)vph-institute.org <dealiix-project(a)vph-institute.org> CC: Alberto Salvadori <alberto.salvadori(a)unibs.it>, Mattia Serpelloni <mattia.serpelloni(a)unibs.it> Dear Colleagues, this is a kind reminder about the dealii-X seminar *tomorrow, May 5 *at*14:00. *The speakers are Alberto Salvadori and Mattia Serpelloni from UNIBS. Please find below the title and the abstract. The usual dealii-X meeting link: https://ruhr-uni-bochum.zoom-x.de/j/67234625691?pwd=tNlXdhaQVGakRuQ7ScR5mXY… Best regards, Ivan *Title*: "Cellular Motility and Integrins Relocation: From Theory to HPC Simulations" *Abstract*: Numerous biological processes rely on cell motility and mechanosensing. These functions emerge from the coordinated interplay of multiple mechanotransductive mechanisms, in which the actin cytoskeleton and cell-matrix adhesions play a central role. During migration, actin polymerization at the leading edge drives protrusion against the resistance of the plasma membrane, generating forces that propagate through the lamellipodium and are ultimately transmitted to the extracellular matrix (ECM) via adhesion protein complexes. Those are mainly made of integrins, transmembrane adhesion receptors that are laterally mobile within the lipid bilayer. The membrane diffusion and active relocation enable integrins to sample the substrate, cluster upon ligand binding, and nucleate nascent focal adhesions at the leading edge. As retrograde actin flow engages integrins via talin and kindlin, mobile receptors are captured and stabilized, converting transient encounters into adhesive complexes. This coupling between integrin mobility and force transmission underlies the transition from short-lived nascent adhesions to more stable focal adhesions, while unengaged integrins continue to redistribute, sustaining adhesion turnover and directional cell migration. In this talk, we will present a continuum multiphysics theory for the engine, the adhesion, the relocation of integrins during cell locomotion. HPC simulations carried out in the dealii-X project of integrin redistribution during membrane advection are compared with experimental evidence. To unsubscribe from this group and stop receiving emails from it, send an email to dealiix-project+unsubscribe(a)vph-institute.org.

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Fwd: Talk by Justo Puerto - May 13th
by Fabio Durastante 04 May '26

04 May '26

Dear Everybody, Please find attached the announcement for an upcoming FLOPtalks from our friends in Florence. The seminar may be of interest to many of you. Best, Fabio -------- Messaggio Inoltrato -------- Oggetto: Talk by Justo Puerto - May 13th Data: Mon, 4 May 2026 06:34:09 -0700 (PDT) Mittente: FLOPtalks <floptalks-group(a)unifi.it> A: FLOPtalks <floptalks-group(a)unifi.it> CC: JUSTO PUERTO ALBANDOZ <puerto(a)us.es> Dear colleagues and friends, we are pleased to announce next seminar of the FLorence OPtimization talkS (FLOPS) series. Justo Puerto <https://www.us.es/trabaja-en-la-us/directorio/justo-puerto-albandoz>, Professor at Universidad de Sevilla,will give a talk entitled "Ordered optimization: theory and applications". The talk will be on *May** 13th at 2:00 p.m. *in**Aula Caminetto, Scuola di ingegneria Santa Marta <https://maps.app.goo.gl/iWi2TtY2rM49epux5> The abstract of the talk is available at the following link <https://sites.google.com/unifi.it/floptalks/home?authuser=3> (as well as in the attached poster). Best regards, Marianna & Margherita -- You received this message because you are subscribed to the Google Groups "FLOPtalks" group. To unsubscribe from this group and stop receiving emails from it, send an email to floptalks-group+unsubscribe(a)unifi.it. To view this discussion, visit https://groups.google.com/a/unifi.it/d/msgid/floptalks-group/970f5d90-f649-… <https://groups.google.com/a/unifi.it/d/msgid/floptalks-group/970f5d90-f649-…>.

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[Indico] [Event reminder] A Riemannian Framework for Optimization Problems in Reversible Markov Chains (19/05/2026, 11:00 Europe/Rome)
by Fabio Durastante 04 May '26

04 May '26

Title: A Riemannian Framework for Optimization Problems in Reversible Markov Chains, Speaker(s): Miryam Gnazzo, , Date and time: 19 May 2026, 11:00 (Europe/Rome), Lecture series: Seminar on Numerical Analysis, Venue: Dipartimento di Matematica (Aula Magna). Address: Largo Bruno Pontecorvo, 5 – 56127 Pisa You can access the full event here: https://events.dm.unipi.it/e/342 Abstract -------- An ergodic Markov chain with transition matrix $P$ and stationary distribution ${\pi}$ is said to be reversible if $D_{{\pi}} P = P^\top D_{{\pi}}$, where $D_{{\pi}}$ denotes the diagonal matrix with the components of ${\pi}$ on its diagonal. Reversibility is a key property in Markov chain theory, with applications ranging from computational biology to network models, such as those arising in power grid analysis. In this talk, we present an approach to optimization problems over reversible Markov chains, with prescribed stationary distribution ${\pi}$. Our framework is based on Riemannian optimization over suitable manifolds of stochastic matrices associated with reversible chains, and it allows us to employ efficient and reliable Riemannian solvers. Within this framework, we address the approximation of the reversible Markov chain closest to a given one. In addition, we describe an application for minimizing Kemeny’s constant, which measures the efficiency of a Markov chain in traversing its states. Note ---- Announcing the next seminar in the NUMPI series. -- Indico :: Email Notifier https://events.dm.unipi.it/e/342

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