Events - Page 17

Abstract: Upon burst, air bubbles release droplets that transfer biological and chemical materials from water bodies to the atmosphere. This mechanism is one of the main sources of cloud condensation nuclei and participates to airborne contamination when the bulk water contains pathogens. Predicting the size and composition of droplets emitted by bubbles requires a fundamental understanding of their dynamic at the surface, yet a consistent physical picture is lacking. Relying on experimental data from bubbles generated in various environments and using scaling analysis, I will show that surface tension gradients control the drainage of bubbles. I will also explain how local perturbations of surface tension can explain their seemingly stochastic burst mechanism. Consequences for application purposes will be mentioned throughout the presentation: I will notably take the examples of bubbles in saltwater and in water contaminated with bacteria.

This talk is part of the Mechanics Lunch Seminar series. That means 20min talks plus discussion in an informal setting.

Zoom: To obtain the Zoom meeting details please contact Timo Koch (timokoch at math.uio.no).

Now it's time for the traditional PhD/postdoc-gathering for Stochastics and Risk which will take place in Abels Utsikt and online on October 28th, 09.30 - 16.30. All PhD students and postdocs have the opportunity to give a 15-minute talk on their research. In addition, Jocelyne Bion-Nadal (École Polytechnique) will give an introductory talk and Kristina Rognlien Dahl (UiO) will introduce the SCROLLER project. As a member of the section, you can attend either in person or online. Welcome!

Benjamin Kedem (Department of Mathematics, University of Maryland, USA) will give a talk on October 27th at 14:15 in Zoom - the link will be sent by mail one day in advance).

Registration Link: https://nettskjema.no/a/167852 

Abstract: Frailty is a multi-system dysregulation leading to a loss of physiological reserve known to predict dementia. However, its link with neurodegenerative alterations of the central nervous system (CNS) is not well understood at present. We investigated the association between the biomechanical response of the CNS and frailty in older adults suspected of normal pressure hydrocephalus (NPH) presenting markers of multiple comorbid neurodegenerative pathologies, including pathologies of Alzheimer’s Disease. The biomechanical response of the CNS was characterized from phase contrast magnetic resonance imaging and intracranial pressure monitoring during a lumbar infusion test. Frailty was assessed with an index of health deficit accumulation. We found a significant association between the CNS biomechanical response and frailty, with an effect size comparable to that between frailty and age, the latter being the strongest known risk factor of frailty. The CNS biomechanical characterization may help to understand how frailty is related to neurodegeneration and detect the shift from normal to pathological brain ageing.

This talk is part of the Mechanics Lunch Seminar series. That means 20min talks plus discussion in an informal setting.

Christian Page (Department of Mathematics, University of Oslo) will give a talk on October 13th at 14:15 (held with restricted attendance in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor and streamed in Zoom - the link will be sent by mail one day in advance).

C*-algebra seminar talk by Ulrik Enstad (University of Oslo)

I will present some of my work on the solid-electrolyte interface. There, so-called electric double layers (EDLs) can form that consist of electrons on the solid screened by a diffuse cloud of ions in the adjacent liquid. EDLs are of paramount importance to many processes in physical chemistry, soft matter and biophysics, as well as in EDL capacitors and modern "supercapacitors". My work on EDLs focused on their (out-of-equilibrium) formation through questions like: 'On what timescale does an electrolyte respond to an applied temperature or voltage difference?', 'How does the (local) temperature in an electrolyte react to an applied electric field?', and 'How is the EDL affected by a change in temperature or salt concentration?'. I will show how answers to these questions suggest new methods for harvesting sustainable energy, for instance, from the controlled mixing of seawater and river water.

This talk is part of the Mechanics Lunch Seminar series. That means 20min talks plus discussion in an informal setting.

Registration Link:  https://nettskjema.no/a/161232

C*-algebra seminar talk by Ole Brevig (University of Oslo)

DuMu^x  (short for "Dune for Multi- {Phase, Component, Scale, Physics,…} flow and transport in porous media") is  a free and open-source simulator for flow and transport processes in porous media. DuMu^x is modern C++ code based on the scientific software framework Dune (Distributed and Unified Numerics Environment) and has a focus on modularity and reusability. 

The main features and ideas behind DuMu^x will be introduced with several examples from recent research projects.

This talk is part of the Mechanics Lunch Seminar series. That means 20min talks plus discussion in an informal setting.

Registration Link:  https://nettskjema.no/a/161230

On 7-9 September 2020, the conference on high-dimensional stochastics will take placeas a virtual meeting under the auspices of at the Wolfgang Pauli Institute (WPI) in Vienna, Austria. The conference is an activity within the thematic program "Mathematics for Risk in Finance and Energy" at the WPI. 

We aim to bring together an interdisciplinary group of leading researchers with interest in high dimensional stochastic modeling. Particular emphasis will be given to infinite dimensional Markov processes, SPDEs, population dynamics, high dimensional statistics and connections to financial and energy modeling. We welcome participants from academia and industry to take part in this event.  

Welcome to the SPATUS kick-off seminar, marking the start of the Thematic Research Group funded by UiO:Energi. The virtual seminar will take place on Zoom.

Mette Langaas (Department of Mathematical Sciences, Norwegian University of Science and Technology) will give a talk on May 19th at 14:15 in Zoom (the link to the event will be available soon).

The 5th Scandinavian Gathering Around Remarkable Discrete Mathematics

During these strange corona times, the need for continuous interaction in science is coming stronger.

We now launch this new Spring Seminar Series Online in probability, stochastic analysis and applications. 

These online seminars are both meant to give a scientific update of our doings, as well as being a social event that we can attend once a week from our home-office. Prepare yourself with a good cup of coffee or tea!

If you want to take part to the seminars, please register at this link.

Heidi Seibold (Department of Statistics, Ludwig-Maximilians-Universität of Munich, GER) will give a talk on May 5th at 14:15 in Zoom https://uio.zoom.us/j/66792241824.

Antonio Canale (Department of Statistical Sciences, University of Padova, ITA) will give a talk on April 21st at 14:15 in Zoom (https://uio.zoom.us/j/66042762975).

Due to travel restrictions related to the spread of Covid-19, the talk of  Lokukaluge Prasad Perera (Department of Technology and Safety, Artic University of Norway), supposedly held on March 16th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor, has been CANCELLED.

Roberto Conti (Sapienza University of Rome, Italy) will give a seminar  talk on 

              Connes isometries of the Cuntz algebras

Morten Hjorth-Jensen (Department of Physics, University of Oslo and Department of Physics and Astronomy, Michigan State University, USA) will give a talk on March 3rd at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.

Haakon Bakka (formerly Computer Electrical Mathematical Science and Engineering Division, King Abdullah University of Science and Technology, KSA, from 01.02.2020 Department of Mathematics, University of Oslo) will give a talk on February 25th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.

Six short lectures on the connection between two ubiquitous objects in Mathematics. 

Johan Pensar (formerly Department of Mathematics and Statistics, University of Helsinki, from 01.02.2020 Department of Mathematics, University of Oslo) will give a talk on February 11th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.