Tidlegare arrangement - Side 138

The Information System Seminar Series features, Egil Øvrelid, a Post-Doctoral fellow at Department of Informatics, UiO

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).

Tor Ole Odden:

"The field of educational research has a massive literature base, with many journals that have been publishing articles for almost a century (or longer). How do we sort through and make sense of literature at this scale? We have begun using an unsupervised machine learning technique from the field of natural language processing, known as latent Dirichlet allocation, to analyze articles from the fields of physics education research and science education research. This technique allows us to extract latent themes, or topics, from the literature and quantify the rise and fall of those topics over time.

In this talk, I will present the basics of the technique, describe some of its underlying theory and applications, and showcase some of the trends that it reveals in how science education theory and practice has evolved over the last 20-100 years." 

The Information System Seminar Series features, Åshild Kolås, a social anthropologist and Research Professor at PRIO 

Hylleraas seminar, hosted in Oslo

Doctoral candidate Farhad Nooralahzadeh at the Department of Informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Low-Resource Adaptation of Neural NLP Models for the degree of Philosophiae Doctor.

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

Ph.d.-kandidat Mattia Mina ved Institutt for teoretisk astrofysikk, Det matematisk-naturvitenskapelige fakultet, vil forsvare avhandlingen "Cosmology at small scales: ultra-light dark matter and baryon cycles in galaxies" for graden Philosophiae Doctor.

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).

Msc. Perizat Berdiyeva at the Department of Chemistry, Faculty of Mathematics and Natural Sciences, is defending the thesis  «Characterization of Heat Storage Materials with Neutron Scattering and Imaging Techniques » for the degree of Philosophiae Doctor.

Hylleraas Friday seminar, hosted in Tromsø

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.

Doctoral candidate Tønnes Frostad Nygaard at the Department of Informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Legging it: An Evolutionary Approach to Morphological Adaptation for a Real-World Quadruped Robot  for the degree of Philosophiae Doctor.

Doctoral candidate Alexander Moltubakk Kempton at the Department of informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Digital Representations and their Mechanisms: a pluralist realist approach for the degree of Philosophiae Doctor.

Msc. Magnus Moe Nygård at the Department of Chemistry, Faculty of Mathematics and Natural Sciences, is defending the thesis «Local and average structure in high-entropy alloys and associated metal deuterides» for the degree of Philosophiae Doctor.

Hylleraas seminar, hosted in Oslo

"Studying spatial trends of heavy metals in soil from a tropical region"

Juan Garcia-Bellido, Universidade Autonoma de Madrid

Tittel: 

 Irreversible stokastiske investeringsproblemer

Evaluert i diskret tid og rom

October 10 is the World Mental Health Day! In relation to that, UiODoc will host two online events on Zoom in the same week focuing on mental health for PhDs and Postdocs.

First, on October 14, we'll have a talk by the senior adviser Kristine Mollø-Christensen at UiO'S Occupational Health Service. Next up, on October 16, is an interactive event with psychologist Maria Abrahamsen Østhassel, known from her social media accounts @PsyktDeg.