Tidlegare arrangement - Side 115

Mottakelsen har dessverre blitt avlyst pga gjeldende koronarestriksjoner.

Njord Seminar with Salima Rafai (Université Grenoble Alpes): "Flowing Active Suspensions: plankton as a model active particle"

Hylleraas interdisciplinary seminar, hosted in Oslo

Abstract: Gravitational settling of a droplet in air onto a soft substrate is a ubiquitous event relevant to many natural processes and engineering applications. We study this phenomenon by developing a three-phase lubrication model of droplet settling onto a solid substrate coated by a thin, soft compressible layer of elastic material. By combining scaling analysis, analytical methods and numerical simulations we elucidate how the resulting droplet dynamics is affected by the soft layer. We discuss extensions to droplet settlings onto thin viscous liquid films and elastic sheets. Our results provide new insight into the coupled interactions between droplets and solids coated by a thin film of a soft material.

Talk can be followed online on Zoom as well as in person. 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.

Mathew Galloway, Institute of Theoretical Astrophysics, University of Oslo.

Open lectures by Detlef Weigel (Max Planck Institute for Biology Tübingen, Germany) and Anna Wargelius (Institute of Marine Research, Norway). Darwin Day is an international recognition of science and humanity, held in memory of Charles Darwin.

Åpne foredrag av Detlef Weigel (Max Planck Institute for Biology Tübingen, Tyskland) og Anna Wargelius (Havforskningsinstituttet, Norge). Arrangementet holdes på engelsk.

MSc. Jakob Stensgaard Diget at the Department of Chemistry, Faculty of Mathematics and Natural Sciences, is defending his thesis «In Pursuit of Well-Defined Organic Polymers - Controlled Synthesis and Accurate Characterization» for the degree of Philosophiae Doctor.

Vi ønsker bedrifter samt studenter fra Det medisinske fakultet, Farmasøytisk institutt og Kjemisk institutt velkommen til matchmakingsarrangement. I etterkant av arrangementet kan studentene søke sommerjobb i bedriftene.

Maintenance plays a crucial role in ships and especially in the vital electric propulsion system. Intelligent predictive maintenance idealistically aims at preventing system failures and minimizing needless repairs, i.e., predicting failure likelihood and time to failure while providing the crew explainable predictions and recommending the best action for timely intervention. This presentation will cover a relevant work in collaboration with Sensor Systems in BigInsight, particularly a paper published under https://doi.org/10.1109/TII.2022.3144177. The failure prediction approach is driven by event logs, which include warnings, alarms, and operational information that describe all the happenings onboard the ship. The failure prediction objective is turned into classification and regression tasks; however, the training data pose three challenges. The events are irregular textual messages. The training data samples are not labelled. The datasets are extremely imbalanced, due to sparse failure events and multiple failure modes. The problem is casted into a weakly supervised machine learning framework. In a multiple instance learning process, the ungiven data labels are learned recursively while fitting the model parameters using deterministic annealing. The overall approach was tested on real ship data, and it successively forecasted few propulsion failures with explainable causes.

Research Seminar Series features, Matthew Jones, Professor at Cambridge Judge Business School, University of Cambridge, UK

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"

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.

Tittel: 

"Fire studenters opplevelser av bachelorprogrammet i kjemi og biokjemi"

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. 

"Mercury in sediments and its bioaccumulation in fish in a contaminated fjord and in background freshwater lakes"

MN-fakultetet inviterer til informasjonsmøte om utveksling, der vi forteller deg hva du trenger å vite for å planlegge et semester i utlandet.

Exploring Probationary Academic Citizenship in the Swiss Context with Professor Nicky le Feuvre.