Previous events - Page 41

The new Department of Mathematics seminar series will present seminars of interest to all sections at the Department.

It will start off with Nils Lid Hjort talking about the 2022/2023 CAS project Stability and Change, which is joint with PRIO.

Abstract: What links a baby’s first breath to adhesive debonding, enhanced oil recovery, filtration or multiphase microfluidics? These processes all involve two-phase flows in rigid or elastic confined vessels and are often prone to interfacial instabilities. The canonical viscous fingering instability, which occurs when air displaces a viscous fluid in the narrow gap between two parallel plates, offers a versatile testbed for such phenomena. In this talk, I will use both experiments and numerical simulations of depth-averaged models to explore several aspects of bubble dynamics in Hele-Shaw cells. I will first show how the onset of fingering can be suppressed when replacing the upper plate of the vessel with an elastic sheet. Interfacial flows in narrow gaps can also exhibit considerable disorder, but they are rarely investigated from a dynamical systems’ perspective. I will show how compliance can promote rich multiplicity of front propagation modes in a channel before turning to bubble propagation in a rigid channel with a depth perturbation. There I will explore how the bubble’s organised transient dynamics is orchestrated by weakly-unstable steady propagation modes, and how its long-term behaviour may be practically unpredictable.

This talk is part of the Mechanics Lunch Seminar series. Bring-your-own-lunch and lots of questions. Hybrid format via Zoom possible on demand (contact timokoch at uio.no)

Is it difficult to set aside time to write? The Academic Writing Centre arranges joint, structured “Shut Up & Write” sessions.

by

Michael Manga

From UC Berkeley

Hosted by Adriano Mazzini

Title: Towards kilometre-scale global modelling: challenges for cloud and precipitation

Speaker: Richard Forbes, ECMWF

Welcome to the Geo-Wednesday in April! This month Karen Mair, Professor in Geoscience at UiO Department of Geosciences and the Njord Centre, will give a talk turning data into sound. 

Every second Tuesday, CBA members gather for lunch and a talk. On April 19th 2022, the talk will be given by postdoctoral researcher Devaraju Narayanappa about "Green-blue link made browner: Modeling the lateral flow of dissolved organic carbon"

Doctoral candidate Giovanni Domenico Di Salvo at the Department of Mathematics, Faculty of Mathematics and Natural Sciences, is defending the thesis Proper Holomorphic Embeddings of open Riemann Surfaces into C² and holomorphic mappings between complex manifolds with dense images for the degree of Philosophiae Doctor.

Abstract: A random, labyrinthine pattern emerges during slow drainage of a granular-fluid system in two- dimensional confinement. Compacted grains are pushed ahead of the fluid-air interface, which becomes unstable due to a competition between capillary forces and the frictional stress mobilized by grain-grain contact networks. We reproduce the pattern formation process in numerical simulations and present an analytical treatment that predicts the characteristic length scale of the labyrinth structure. The pattern length scale decreases with increasing volume fraction of grains in the system and increases with the system thickness. By tilting the model, aligned finger structures, with a characteristic width, emerge. A transition from vertical to horizontal alignment of the finger structures is observed as the tilting angle and the granular density are varied. The dynamics is reproduced in simulations. We also show how the system may explain patterns observed in nature, created during the early stages of a dike formation.

This talk is part of the Mechanics Lunch Seminar series. Bring-your-own-lunch and lots of questions. Hybrid format via Zoom possible on demand (contact timokoch at uio.no)

Welcome to our GEOHYD Lunch Seminar Friday 8th of April @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Cassie Wells Lumbrazo, University of Washington.

Michaela Brchnelova, KU Leuven, Belgium.

Is it difficult to set aside time to write? The Academic Writing Centre arranges joint, structured “Shut Up & Write” sessions.

Title: Constraining atmospheric micro plastics.

Speaker: Natalie M. Mahowald, Cornell University

C*-algebra seminar by Alexander Stolin

by

Nicolas Thibault

From the University of Copenhagen

Hosted by Madeline Vickers

Associate Professor Fredrik S. Hage, the Structure Physics section

Welcome to our dScience lunch seminar in the Science Library! This event is open to everyone.

Research Seminar Series features, Susan Scott, Professor of Information Systems, Department of Management, London School of Economics, UK

Welcome to our GEOHYD Lunch Seminar Friday 1th of April @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Ugo Nanni, Dept of Geosciences.

Doctoral candidate Alma Mulac at the Department of Pharmacy, Faculty of Mathematics and Natural Sciences, is defending the thesis "Medication errors in hospitals - Exploring medication safety through incident reports and observation of practice" for the degree of Philosophiae Doctor.

Reetika Joshi, postdoctoral fellow of Rosseland Centre for Solar Physics (RoCS), University of Oslo.

Is it difficult to set aside time to write? The Academic Writing Centre arranges joint, structured “Shut Up & Write” sessions.