Tidligere gjesteforelesninger og seminarer - Side 7

Tid og sted: , Niels Henrik Abels hus, 9th floor

Innovations in fluid mechanics are leading to better food since ancient history, while creativity in cooking inspires applied and fundamental science. In this talk, I will discuss how recent advances in hydrodynamics are changing food science, and how the surprising phenomena that arise in the kitchen lead to discoveries and technologies across the disciplines, including rheology and soft matter. Central topics include cocktails and champagne (multiphase flows), whipped cream (complex fluids) and pancake making (viscous flows). For every topic, I will present the state-of-the-art knowledge, the open problems, and likely directions for future research.

Publications:
Mathijssen, A. J., Lisicki, M., Prakash, V. N., & Mossige, E. J. (2023). Culinary fluid mechanics and other currents in food science. Reviews of Modern Physics, 95(2), 025004.

Fuller, G. G., Lisicki, M., Mathijssen, A. J., Mossige, E. J., Pasquino, R., Prakash, V. N., & Ramos, L. (2022). Kitchen flows: Making science more accessible, affordable, and curiosity driven. Physics of Fluids, 34(11).

Tid og sted: , Peisestua (room 304), Svein Rosselands Hus

Sigurd K. Næss, Researcher at Institute of Theoretical Astrophysics, University of Oslo.

Tid og sted: , Origo

Felleskollokvium by Dr. Antoine Camper, Dept. of Physics, UiO

Tid og sted: , NHA108

C*-algebra seminar talk by Valerio Proietti (University of Oslo)

Tid og sted: , Kristine Bonnevies room (3508)

By Sally Otto and Michael Whitlock from the University of British Columbia, Vancouver, Canada

Tid og sted: , Peisestua (room 304), Svein Rosselands Hus

Ragnhild Aurvik, Ph.D student at Institute of Theoretical Astrophysics, University of Oslo.

Tid og sted: , NHA B1120
In this talk, I explain how we explicitly construct a motivic analog of the fundamental group of the circle. We construct a group structure on the set of pointed naive homotopy classes of maps from the Jouanolou device to the projective line. The group operation is defined via matrix multiplication on generating sections of line bundles and only requires basic algebraic geometry. In particular, it is completely independent of the construction of the motivic homotopy category. Based on joint work with William Hornslien, Gereon Quick, and Glen Matthew Wilson.
Tid og sted: , NHA108

QOMBINE seminar talk by Ruben Bassa (SINTEF)

Tid og sted: , Peisestua (room 304), Svein Rosselands Hus

Carlos A.R. Herdeiro, Professor in the Gravitational Geometry and Dynamics Group, Mathematics Department, Aveiro University (Portugal).

Tid og sted: , NHA 108

Franz Fuchs (Sintef/UiO) will give a talk with title "Hamiltonians with time evolution restricted to subspaces"

Tid og sted: , Room 4424 H.H. Gran, Kristine Bonnevies hus

By Olli Hyvärinen, postdoc in the AQUA section, IBV

Tid og sted: , Niels Henrik Abels hus, 9th floor

We have developed a pump-less recirculation Organ-on-Chip (rOoC) platform that generates a directional gravity-driven flow. This platform can be adapted to various flow conditions and enables the study of endothelial lining, blood vessel sprouting, circulation of immune cells, pathogens or other particles, and incorporation of 3D cell models like organoids. Additionally, we have developed a computational model to predict shear stress and mass transport within the rOoC, allowing for customization of the platform for various use-cases.

The rOoC platform is very versatile and can be used to model for instance drug-induced liver-injury (DILI) that mimics the complex interaction between resident human stem cell-derived liver organoids (3D-HLO) and circulating immune cells. Moreover, we show the functional crosstalk between 3D-HLOs and human pancreatic islets to model the onset of type-2 diabetes.

Tid og sted: , Peisestua (room 304), Svein Rosselands Hus

Samantha Stever, Assistant Professor in the Department of Physics, Okayama University (Japan).

Tid og sted: , NHA 723 and Online
Tid og sted: , Peisestua (room 304), Svein Rosselands Hus / Zoom

Hans Arnold Winther, Institute of Theoretical Astrophysics, University of Oslo.

Tid og sted: , NHA B1120

Markus Spitzweck (Universität Osnabrück) will present the talk «Representation categories and motives».

Tid og sted: , Niels Henrik Abels hus, 9th floor

This seminar will consist of two separate presentations, each about 15-minute long.

1) Magnetic Quincke Rollers with tunable single particle dynamics and collective states
2) Electrically controllable ferrofluids

Tid og sted: , Seminar room 3508 Bonnevie, Kristine Bonnevies hus

Unfortunately, the seminar by Olli Hyvärinen, AQUA, IBV, is cancelled.

Tid og sted: , Niels Henrik Abels hus, 9th floor
It is well known that if the singular values of a matrix are distinct, then its best rank-n approximation in the Frobenius norm is uniquely determined and given by the truncated singular value decomposition. On the other hand, this uniqueness is in general not true for best rank-n approximations in the spectral norm. In this talk we relate the problem of finding best rank-n approximations in the spectral norm to Kolmogorov n-widths and corresponding optimal spaces. By providing new criteria for optimality of subspaces with respect to the n-width, we describe a large family of best rank-n approximations to a given matrix. This results in a variety of solutions to the best low-rank approximation problem and provides alternatives to the truncated singular value decomposition. This variety can be exploited to obtain best low-rank approximations with problem-oriented properties.
We further discuss the generalization of these results to compact operators in L2, and explain how they can be used to both describe the out-performance of smooth spline approximations of solutions to differential equations when compared to classical finite element methods, and to solve the outlier-problem in isogeometric analysis.
This talk is based on work done in collaboration with Michael Floater, Carla Manni and Hendrik Speleers.
Tid og sted: , Room 1119, Niels Henrik Abels hus

The Section 4 seminar for the Spring of 2023 will be held on Wednesdays at 10:15–12:00 (see the schedule)

Tid og sted: , NHA107

C*-algebra seminar talk by John Quigg (Arizona State University)

Tid og sted: , Niels Henrik Abels hus, 9th floor

I will discuss some of our recent results on active chiral and nematic membranes. The chiral stresses we consider give rise to a novel form of odd elasticity. To outline this phenomenology I will give explicit calculations outlining spontaneous flow transitions and shape instabilities. I will discuss the relevance of these results in developmental biology and their relation to active nematics, in particular how certain limits of active nematic membranes can reduce to a theory of an isotropic membrane with an active stress defined by the deviatoric part of the shape operator.

Tid og sted: , Kristine Bonnevies Hus, Bikuben (Nucleus)

Welcome to seminar by Mikkel Elle Lepperød (Researcher, Cinpla Group, FYSCELL, IBV).