Tidlegare gjesteforelesninger og seminarer - Side 23

Tomi Koivisto, University of Tartu.

Steffen Grønneberg (Department of Economics, BI Norwegian Business School) will give a talk on November 10th 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).

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).

Nancy Narang, Rosseland Centre for Solar Physics, Institute of Theoretical Astrophysics (UiO). 

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.

Santiago Casas, CEA Paris-Saclay

Juan Garcia-Bellido, Universidade Autonoma de Madrid

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

Atul Mohan, Rosseland Centre for Solar Physics, Institute of Theoretical Astrophysics, UiO.

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

By Hans Bauer from the University of Oxford (Department of Zoology)

Duncan Watts, Institute of Theoretical Astrophysics, UiO.

Matematisk Institutt ved Universitetet i Oslo ønsker deg med dette velkommen til en forsikringsdag der noen av landets topp fagfolk vil ta deg med gjennom noen av de mest dagsaktuelle emner innen forsikring.

Vi er er landets ledende leverandør av aktuarer og finansmatematikere til forsikrings- og finansnæringen og også det ledende forskningssenter på disse feltene.

David Hilditch, Center for astrophysics and gravitation, University of Lisbon.

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

Jón Gudmundsson, Senior Research Scientist at Stockholm University Physics Department and the Oskar Klein Centre for Cosmoparticle Physics

Dr. Clare Burrage, University of Nottingham (UK).

 Salvo Guglielmino, National Institute for Astrophysics (INAF) in Catania,  Italy

En gang i året arrangerer Artica Svalbard et av Arktis' viktigste kunstarrangementer Artica Listens. Sammen med Norsk Pen løfter vi i år fram de mest presserende problemstillingene Svalbard og den menneskelige aktiviteten på øygruppen står ovenfor.

Davide Decataldo, Institute of Theoretical Astrophysics, UiO