Previous events - Page 85

Monday 7th February Mikolaj Szydlarski will give a talk at the "Waiting for Pint of Science - Polish edition" on "Understanding the Sun. Numerical models of our local star".

Monday 7th February Agata Krzesińska will give a talk  at the "Waiting for Pint of Science - Polish edition" on "Norwegian meteorites – how to find them and why to study".

Doctoral candidate Ulrike Bayr at the Department of Geosciences, Faculty of Mathematics and Natural Sciences, is defending the thesis Survey techniques in landscape monitoring: testing new quantitative methods to assess landscape change for the degree of Philosophiae Doctor.

Doctoral candidate Cédric Le Texier at the Department of Mathematics, Faculty of Mathematics and Natural Sciences, is defending the thesis Combinatorial Patchworking, Real Tropical Curves and Hyperbolic Varieties for the degree of Philosophiae Doctor.

By Anna Sturrock from the University of Essex, UK

Njord Seminar with talks by

Vidar Skogvoll (University of Oslo): "A phase-field crystal framework for 3D dislocation dynamics"

and

Marcel Moura (University of Oslo): "Capillary pumping: the spreading of pollution in porous media"

Hylleraas seminar, hosted in Tromsø

Abstract: We investigate the simulation of a rising bubble and a stationary droplet interaction to gain a better understanding of the rising dynamics and the morphology changing of bubble-droplet aggregate. A detailed study is conducted on the interaction process under different-size bubbles with various combinations of spreading factors. The current simulation framework consists of the conservative phase-field Lattice Boltzmann equation (LBE) for interface tracking and the velocity-pressure LBE for hydrodynamics. We simulate the contact line dynamics to confirm the method's accuracy. We further investigate the morphology changing of two contact droplets under different combinations of spreading factors and depict the final morphologies in a diagram. The separated, partially engulfed and complete engulfed morphologies can be replicated by systematically altering the sign of the spreading factors. The rising bubble and droplet interaction is simulated based on different final morphologies by adding a body force. The results show that the aggregate with double emulsion morphology can avoid distortion and maintain a greater terminal velocity than the aggregate with partially engulfed morphology.

Talk is online on Zoom. Please contact "timokoch at uio.no" for the Zoom link. This talk is part of the Mechanics Lunch Seminar series. Bring-your-own-lunch and lots of questions.

Welcome to our GEOHYD Lunch Seminar Friday 4th of February @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Ugo Nanni, Dept of Geosciences.

Doctoral candidate Nils-Anders Johannes Labba at the Department of Pharmacy, Faculty of Mathematics and Natural Sciences, is defending the thesis "In vitro models and methods for assessment of developmental neurotoxicity and neuroprotection" for the degree of Philosophiae Doctor.

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

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

This week we discuss a paper on the role of ancient and historical DNA in preserving biodiversity, recently published in Trends in Ecology & Evolution.

Title: Airborne Turbulence Measurements in Polar Clouds during the (AC)³  campaigns ACLOUD, AFLUX and MOSAiC-ACA

Speaker: Christof Lüpkes, Alfred Wegener Institute for Polar and Marine Research

Welcome to our weekly lunch seminar held in the dScience lounge area! This event is open to PhD candidates and postdocs.

The FARAON 2022 Conference provides a platform for young researchers to present, share, and discuss the latest and upcoming developments in Advanced Functional Materials with wide networking.

Deep learning (DL) has had unprecedented success and is now entering scientific computing with full force. However, current DL methods typically suffer from instability, even when universal approximation properties guarantee the existence of stable neural networks (NNs). In this talk we will show that there are basic well-conditioned problems in scientific computing where NNs with great approximation qualities are proven to exist, however, there does not exist any algorithm, even randomised, that can train (or compute) such a NN to even 1-digit of accuracy with a probability greater than 1/2. These results provide basic foundations for Smale’s 18th problem ("What are the limits of AI?") and imply a potentially vast classification theory describing conditions under which (stable) NNs with a given accuracy can be computed by an algorithm. We begin this theory by initiating a unified theory for compressed sensing and DL, leading to sufficient conditions for the existence of algorithms that compute stable NNs in inverse problems. We introduce Fast Iterative REstarted NETworks (FIRENETs), which we prove and numerically check (via suitable stability tests) are stable. The reference for this talk is: https://arxiv.org/abs/2101.08286 (to appear in Proc. Natl. Acad. Sci. USA).

We have encouraged students to develop their own physics problems, explore them and report on their results in the form of a computational essay in the course in elementary electromagnetism (Fys1120) from 2018 to 2021. In parallel we have developed new learning material and supporting exercises to provide students with sufficient skills and knowledge to succeed with an essay project. In 2021 the computational essay project was used as an extended home exam counting 50% towards the final grade.

In this talk, I will discuss experiences and reflections on the use of computational essays and how we plan to develop this activity in the coming years.

The Information System Seminar Series features, Paolo Quattrone, Professor of Accounting, Governance and Society, and Director of the Centre for the Analisis of Investment Risk at the Alliance Manchester Business School, UK. 

The Norwegian Environmental Chemistry Symposium Series builds upon a long lasting tradition of Norwegian conferences on environmental chemistry. After pausing of the conferences since 2013, they resurged as a continuous meeting series with NECS 2020 held in September 2020 in Loen, Norway. The new symposium series is organized under the auspices of the Norwegian Chemical Society´s Division for Analytical Chemistry.

Njord Seminar with Marcel Thielmann (University of Bayreuth): Crushed and fried: collaborative generation of deep earthquakes due to grain size reduction and shear heating

Doctoral candidate Jing Sun at the Department of Geosciences, Faculty of Mathematics and Natural Sciences, is defending the thesis Deep learning-based seismic data processing for attenuation of interference noise and deblending in the shot domain for the degree of Philosophiae Doctor.

Hylleraas seminar, hosted in Oslo