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Tidligere arrangementer

Tid og sted: , Eilert Sundts hus, ninth floor, room 929

The African Anthropology seminar series features Stacey Langwick, Associate Professor at the Department of Anthropology, Cornell University. 

Tid og sted: , NHA 723
Tid og sted: , N.H. Abels hus rom 126

We study rationality questions for the Fano schemes of non-maximal linear spaces on a smooth complete intersection X of two quadrics, especially over non-closed fields. We start by showing that they are all geometrically rational. We then ask their rationality over k and analyze in details the case of second maximal linear spaces. In particular, we generalize results of Hassett-Tschinkel and Benoist-Wittenberg when X has odd dimension, and extend work of Hassett-Kollár-Tschinkel when X has even dimension and k = R. This is joint work with Lena Ji.

Tid og sted: , 1249 at Eilert Sundts hus

Department seminar. Jonathon Hazell is an Assistant Professor at London School of Economics. He will present the paper "How Does Monetary Policy Affect Consumption? The Indebted Demand Channel" (written with Angus Foulis, Atif Mian and Belinda Tracey).

Tid og sted: , Origo

Elena Mamonova, PhD fellow at the Centre for Planetary Habitability (PHAB), University of Oslo

Tid og sted: , St. John's College, Oxford

Kodwo Eshun (Goldsmiths, University of London) will give a guest lecture at St. John’s, University of Oxford, 2. April 2025. The lecture will take place in the Auditorium at St. John’s College at 5.30 pm. Musicologist Adam Harper (University of Oxford) will introduce the lecture. The lecture will be open. All are welcome to attend!

 

In this lecture, Dr. Lara Momesso will discuss the contradictions and tensions that have emerged in Taiwan between the ambitions to adhere to international norms and the challenges that this would pose to the country. 

Tid og sted: , RITMO, Forsamlingssalen/YouTube

Professor in the Department of Psychology and Health Studies at the University of Saskatchewan, Canada, Janeen Loehr, will speak at RITMO's Seminar Series.

Tid og sted: , Scene Domus Bibliotheca

Ungdom scroller p? TikTok og sluker internasjonale str?mmeserier. Hvordan skal norske medier klare seg i konkurransen om de unges oppmerksomhet?

Tid og sted: , Room 1249 at Eilert Sundts Hus

Department seminar. Jon de Quidt is a Reader at Queen Mary University of London. He will present the paper "How Much Should We Trust Observational Estimates?" (written with David Rhys Bernard, Gharad Bryan, Sylvain Chabé-Ferret, Jasmin Clair Fliegner and Roland Rathelot).

Tid og sted: , Zoom
Tid og sted: , Auditorium U40, Domus Theologica

Arkeologisk fredagsseminar med Anette Sand-Eriksen fra Kulturhistorisk museum, som vil presentere: "Skogsb?nder p? ?stlandet: Ny innsikt mot en dypere forst?else av de nordiske bronsealdrer".

Velkommen!

Tid og sted: , NHA B1120
Tid og sted: , Henrik Wergelands hus 421

Language Trajectory Drawings as a Biographic Method in Researching Sámi Language Reclamation in Families: Reflections and Experiences by Anette Briksdal

Tid og sted: , Niels Henrik Abels hus, 9th floor, 919

In recent years there have been numerous studies on floating films of non-Newtonian fluids due to their application to model the stability of floating ice shelves. Sayag & Worster (2019) showed theoretically that expanding cylinders of shear-thinning fluids can become non-axisymmetrical at the advancing fluid edge, driven by their non-Newtonian rheology. This instability carries over to radially spreading, thinning films of the same material when that fluid floats on a deeper bath of less viscous, but denser, Newtonian fluid.

Experimentally validating these theoretical results has, however, been challenging. Initial experimental exploration using Xanthan gum floating on a dense bath of salt solution shows dramatic non-axisymmetrical patterns. These patterns have their origin in interfacial effects, rather than Sayag & Worster's instability, with the expanding film appearing to fracture under extensional stresses at the fluid edge (Ball et al., 2022).

In this talk, I will present a new set of experiments exploring the instability, in which spreading films of aqueous suspensions of Carbopol and Xanthan gum are floated on a bath of more dense perfluorinated oil. The immiscibility between the bath and floating film prevents the failure of the material under tension and allows comparison against theoretical predictions from a shallow film model (Ball & Balmforth, 2021; Ball & Balmforth 2025).

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

George Cherry, Rosseland Centre for Solar Physics, ITA, UiO

Tid og sted: , 1249 at Eilert Sundts hus

Department seminar. Lassi Ahlvik is a Professor in Environmental Economics at the University of Helsinki. He will present the paper "Pigouvian Income Taxation" (written with Matti Liski and Mikael M?kimattila).

Tid og sted: , Eilert Sundts hus, ninth floor, room 929

The Departmental Seminar Series features Doctor Stuart Strange, Department of Culture Studies and Oriental Languages, University of Oslo

Tid og sted: , PAM seminar room 2, online option. Click here to sign up for Zoom.

In this lecture, Professor Bi-yu Chang discusses state policies and interventions in constructing ideas of identity and nationhood in Taiwan's educational system.

Tid og sted: , Niels Henrik Abels hus, 9th floor, 919
In this talks we explore two types of buckling in thin cylinder-like structures.  
First, we study the effect of inflation on the swelling-induced wrinkling of thin elastic membranes in a set-up that is commonly used to create microchannels in lab-on-chip applications. Using a combination of experiments, mathematical analysis and associated numerical simulations, we demonstrate that the out-of-plane deformation of the inflated membrane and the resulting anisotropic stress lead to two distinct instabilities as the swelling progresses. The membrane first develops small-amplitude wrinkles that retain the cross-channel symmetry. Their wavelength depends on the pressure and is set in a process similar to the axisymmetric buckling of pressurised, uni-axially compressed cylindrical shells. As swelling increases, the membrane undergoes a secondary instability during which the wrinkles coarsen into large-amplitude folds whose morphology can be controlled by the degree of pre-inflation. We elucidate the fundamental mechanisms responsible for this behaviour to explain how inflation can be used as a control mechanism in the manufacture of microchannels.
Next, we study compression of a beverage can, mostly filled with a liquid. When uniaxially compressed empty cylinders buckle, they typically form periodic structures that break both axial and radial symmetry. By contrast, our liquid-filled cylinder buckle axisymmetrically. The resulting ring buckles are localised and appear sequentially, eventually filling the entire can surface. The final periodic pattern has a predictable wavelength that scales with the shell thickness and radius, as observed in the soft microfluidics channels during the initial stages of wrinkling. We characterise the material properties of the cans experimentally in order to model their post-buckling behaviour. The results of our model, which is similar to the 1-D nonlinear Swift-Hohenberg equation, suggest that the sequential appearance of ring buckles occurs via homoclinic snaking. Our system provides a novel experimental demonstration of this mechanism, thereby linking nonlinear dynamics of localised patterns and mechanics of shell buckling. 
Tid og sted: , Niels Henrik Abels hus, 9th floor, 919
It is widely known that freezing breaks soft, wet materials. However, the mechanism underlying this damage is still not clear. To understand this process, we freeze model, brittle hydrogel samples, while observing the growth of ice-filled cracks that break these apart. We show that damage is not caused by the expansion of water upon freezing, or the growth of ice-filled cavities in the hydrogel. Instead, local ice growth dehydrates the surrounding hydrogel, leading to drying-induced fracture [1]. This dehydration is driven by the process of cryosuction, whereby undercooled ice sucks nearby water towards itself, feeding its growth. Our results highlight the strong analogy between freezing damage and desiccation cracking, which we anticipate being useful for developing an understanding of both topics (Figure 1). Our results should also give useful insights into a wide range of freezing processes, including cryopreservation, food science and frost heave.
Tid og sted: , Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor

The Tien Mai is currently a postdoc at FHI. He has held postdoc positions in statistics at NTNU (Trondheim) and in biostatistics at UiO (OCBE). His research spans statistics and machine learning, with a particular interest in PAC-Bayesian analysis. He holds a PhD in Statistics from CREST-ENSAE-ParisTech/Paris Saclay and University College Dublin.

Tid og sted: , HELSAM, Room 218

The African Anthropology seminar series features James Wintrup, senior researcher at the Chr. Michelsens Institute (CMI)

Tid og sted: , 1249 at Eilert Sundts hus

Department seminar. Ole-Andreas Elvik N?ss is an Assistant Professor at the Department of Business and Management Science at the Norwegian School of Economics (NHH). He will present the paper "Never-Realized Capital Gains" (written with Lucy Msall, University of Chicago).