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Tidligere arrangementer

Tid og sted: 23. sep. 2022 12:1513:00, Niels Henrik Abels hus, 9th floor

Stephen Hladky presents work in collaboration with Margery A. Barrand (both Department of Pharmacology, University of Cambridge).

Abstract: Extravascular fluxes of marker substances and some wastes are sufficiently fast that there is almost certain to be a component of flow augmenting their diffusion in the parenchyma. There have been two major proposals for how this flow is produced and where it is important. The evidence for the classical and glymphatic hypotheses will be reviewed. Extravascular, and in particular perivascular, routes for fluid movement out of the parenchyma to lymphatics may be important in the development of hydrocephalus.

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Tid og sted: 23. sep. 2022 11:0012:00, NHA 723 and Online
Tid og sted: 22. sep. 2022 14:1516:00, NHA B1120

I will explain how motivic homotopy theory can be used to attack problems regarding finite projective modules over smooth affine k-algebras. I will recall in particular the foundational theorem of Morel and Asok-Hoyois-Wendt, and the construction of the Barge-Morel Euler class. Time permitting, I will explain recent progress on Murthy's splitting conjecture.

Tid og sted: 22. sep. 2022 14:1515:00, NHA723

C*-algebra seminar talk by Marco Matassa (OsloMet)

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Tid og sted: 21. sep. 2022 14:1517:00, NHA 1120

Financial risk arising from the increasing of life expectancy. This is all in a nutshell. To know more, come to the lecture: forecasting, modelling, quantification.

Tid og sted: 19. sep. 2022 15:0516:00, Niels Henrik Abels hus: Undervisningsrom 1119

We combine a systematic approach for deriving general a posteriori
 error estimates for convex minimization problems using convex duality relations with a recently derived generalized Marini formula. The resulting a posteriori error estimates are essentially constant-free and apply to a large class of variational problems including the p-Dirichlet problem, as well as degenerate minimization, obstacle and image de-noising problems.
For the p-Dirichlet problem, the a posteriori error bounds are equivalent to the classical residual type a posteriori error bounds and, hence, reliable and efficient.

Tid og sted: 15. sep. 2022 14:1516:00, NHA B1119

Abstract (PDF)

Nils Henrik on a sunny day
Tid og sted: 12. sep. 202214. sep. 2022, The Norwegian Academy of Science and Letters

A conference in honour of Nils Henrik Risebro on the occasion of his 60th birthday.

picture of the candidate
Tid og sted: 9. sep. 2022 13:15, room 720 and Zoom - Niels Henrik Abels hus

Doctoral candidate Dennis Schroers at the Department of Mathematics will be defending the thesis New Topics in Nonlinear Functional Data Analysis for the degree of Philosophiae Doctor.

Tid og sted: 9. sep. 2022 12:1513:00, Niels Henrik Abels hus, 9th floor

José Carlos Nieto Borge is a marine physicist and associate professor at the Universidad de Alcalá de Henares, Spain.

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Tid og sted: 5. sep. 2022 08:008. sep. 2022 17:00, Room 1259 "Abels utsikt", 12th floor, Niels Henrik Abels hus, University of Oslo

A four-days workshop to appreciate and discuss advances in risk and stochastics with a close look into applications and numerical methods

Tid og sted: 2. sep. 2022 12:1513:00, Niels Henrik Abels hus, 9th floor

We consider the linearized elasticity equations, discretized using multi-patch Isogeometric Analysis. To solve the resulting linear system, we choose the Dual-Primal Isogeometric Tearing and Interconnecting (IETI-DP) Method with a scaled Dirichlet preconditioner. We are interested in a convergence analysis. See more details below.

We will present the results of numerical experiments that demonstrate our theoretical findings.

Tid og sted: 30. aug. 2022 13:0014:00, Abels Utsikt, 12. etasje i Niels Henrik Abels hus

Professor Elaine Cohen (University of Utah) kreeres til æresdoktor ved UiO. I den forbindelse vil hun holde en forelesning: Mathematics and Geometric Modeling: Similar Ingredients, Distinct Goals.

Tid og sted: 25. aug. 2022 14:1516:00, NHA B1119

I will discuss the question in the title. This is joint work with Alex Degtyarev and Ilia Itenberg. This will be a talk involving very classical topics in algebraic geometry. I will try to make the talk accessible to students at master- and PhD level.

Tid og sted: 25. aug. 2022 11:0012:00, NHA108

QOMBINE seminar by Daniel Stilck Franca (ENS Lyon)

Tid og sted: 24. aug. 2022 14:1515:00, NHA723

C*-algebra seminar talk by Pinhas Grossman (University of New South Wales)

YMC*A
Tid: 8. aug. 202212. aug. 2022

A conference organised for and by master/Ph.D.-students and postdocs in operator algebras (both von Neumann and C*-algebras) and related areas, with the goal of fostering scientific and social interaction between young researchers.

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Tid: 8. aug. 202212. aug. 2022
picture of the candidate
Tid og sted: 28. juni 2022 15:00, room 720 and Zoom - Niels Henrik Abels hus

Doctoral candidate Floris Eelke Elzinga at the Department of Mathematics will be defending the thesis Free Probabilistic and Poisson–Lie Geometric Methods for Quantum Groups for the degree of Philosophiae Doctor.

Tid og sted: 24. juni 2022 12:1513:00, Niels Henrik Abels hus, 9th floor

The simulation of multi-phase fluids has attained growing interest in the last decades. While for single-phase flow with the Navier-Stokes system the basic model is well understood, for multi-phase systems additional challenges by the necessity to track the transition zones or interfaces between different fluid components arise. 
We propose to use a phase field as a smooth indicator function to describe this situation. Using phase-field models, one introduces a small layer of mixed fluids as a so-called diffuse interface. One benefit of phase-field models is, that they can naturally deal with topology changes and can easily be extended to cope with contact line dynamics.
This model allows for discussing the optimal control problem for two-phase flow. We introduce a thermodynamically consistent phase-field model for two-phase flow including a model for contact line dynamics and introduce an energy stable numerical scheme. 
This scheme allows us to investigate the time-discrete (open loop) optimal control problem, where we investigate different control actions to steer a given distribution of phases towards the desired distribution. We derive the existence of solutions to the optimal control problem and provide first-order optimality conditions.

Hybrid format via Zoom possible on demand (contact timokoch at uio.no)

Tid og sted: 21. juni 2022 11:0012:00, NHA108

C*-algebra seminar by Marcelo Laca (University of Victoria)

Nordfjordeid landscape, sky, fjord, mountains
Tid og sted: 20. juni 202224. juni 2022, Sophus Lie Conference Center, Nordfjordeid, Norway.

Nordfjordeid Summer school 2022

Tid og sted: 17. juni 2022 12:1513:00, Niels Henrik Abels hus, 9th floor

Migration of particles and deformation and coalescence of droplets can be highly affected by the non-Newtonian properties of the carrier fluid. 
In this talk, we focus on the effects of viscoelasticity and yield stress (plasticity) on particle and droplet dynamics. Results are presented from numerical simulations of Navier-Stokes equations coupled with viscoelastic and elastoviscoplastic constitutive models. We will investigate how to yield stress and elasticity affect the final position of a particle in channel flows, and how complex fluid droplets deform, merge and jump on a superhydrophobic surface.

Hybrid format via Zoom possible on demand (contact timokoch at uio.no)

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Tid og sted: 17. juni 2022 10:0012:00, NHA 1020 and Online