Previous events - Page 46

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.

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"

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.

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

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).

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. 

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.

Abstract: The fungal kingdom is one of the most species-rich organismal groups, containing up to 6 million species worldwide with a large diversity of ecosystem functions. Multicellularity has evolved independently in fungi, and over time many different growth forms and structures have originated. I will present some basics on fungal growth and the formation of complex multicellular structures.

Online participation is possible too. 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 28th of January @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Clare Webster, SLF.

Tony Mroczkowski, European Southern Observatory (ESO), München.

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

by

Stephen E. Grasby

From Geological Survey of Canada

Hosted by Henrik Svensen

Learn about how open access publishing is funded and what it means for you as a researcher or adviser.

We invite you to the January RoCS Solar/Stellar Lunch. You are invited to discuss your work with colleagues.

SPARK Norway Educational Forum are monthly open meetings organized by UiO:Life Science and SPARK Norway partners.

Research Seminar Series features, Yingqin Zheng, Senior Lecturer at Centre for Research into Sustainability,  School of Business and Management, Royal Holloway, University of London, UK

Doctoral candidate Thomas André Larsen Greiner at the Department of Geosciences, Faculty of Mathematics and Natural Sciences, is defending the thesis Deep learning in seismic wavefield reconstruction and resolution enhancement for the degree of Philosophiae Doctor.

Njord Seminar with Kristina Dunkel (University of Oslo): Earthquakes in the lower crust - origins and consequences