Tidlegare arrangement - Side 128

Stable polynomials are a multivariate generalization of real-rooted univariate polynomials. This notion of stability for hypersurfaces can be extended to lower-dimensional varieties, giving rise to positively hyperbolic varieties. I will present results showing that tropicalizations of positively hyperbolic varieties are very special polyhedral complexes with a rich combinatorial structure. This, in particular, generalizes a result of P. Brändén showing that the support of a stable polynomial must be an M-convex set.

A tale of six diatoms: an insight into the taxonomy of Arctic diatoms from different sea-ice communities and their physiological response to climate change

Doctoral candidate Nancy Saana Banono at the Department of Pharmacy, Faculty of Mathematics and Natural Sciences, is  defending the thesis "Functional analysis of psychiatric risk genes in zebrafish (Danio rerio): a focus on the L-type voltage-gated calcium channel subtypes Cav 1.2 and Cav 1.3" for the degree of Philosophiae Doctor.

Title: IPCC-AR6 Chap. 6: Short-lived climate forcers

Speaker: Terje Berntsen, University of Oslo 

Doctoral candidate Carl Martin Rosenberg at the Department of informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Supporting Continuous Engineering with Unsupervised Log Analysis for the degree of Philosophiae Doctor.

Joao Inacio is MSc student CS:Physics 1st year. After the seminar we will have pizza. 

The Information System Seminar Series features, Thomas Hylland Eriksen,  Professor of Social Anthropology, UiO 

Ph.d.-kandidat Souvik Bose ved Institutt for teoretisk astrofysikk, Det matematisk-naturvitenskapelige fakultet, vil forsvare avhandlingen "On the dynamics of spicules and mass flows in the solar atmosphere" for graden Philosophiae Doctor.

Marginal maximum likelihood estimation of longitudinal latent variable models for ordinal observed variables is challenging due to the high latent dimensionality required to accurately model residual dependencies for repeated measurements. We use second-order Laplace approximations to the high-dimensional integrals in the marginal likelihood function for longitudinal item response theory models and implement an efficient estimation method based on the approximations. The method is illustrated with items from the Montreal Cognitive Assessment, administered at four time points in a Hong Kong study of aging and well-being. We discuss the limitations of the proposed estimation method and outline a potential extension to the approach that uses a dimension-reduction technique.

Tittel på prøveforelesning: «Adulterations in herbal products».

An Environmental case study of the Inner Drammensfjord: Environmental conditions and microplastic accumulation - Drammensfjorden, Eastern Norway

This week we have the pleasure of having Anne Marthine Rustad and Signe Riemer-Sørensen from SINTEF and the Mathematics and Cybernetics department.

SINTEF is a very important employer in our field of study and we look forward to hear about exciting research and job possibilities. Earlier this semester we forwarded several summer job options from SINTEF. 

Mathijs Janssen (University of Oslo): Electrolyte relaxation near electrified surfaces—from flat plates to nanoporous supercapacitors

Doctoral candidate Xiaojie Zhu at the Department of informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Privacy-preserving computation over outsourced dataset for the degree of Philosophiae Doctor.

Hylleraas seminar, hosted in Oslo

PhD candidate Johannes C. Rusch at the Department of Biosciences will be defending the thesis "Environmental DNA (eDNA) monitoring of two different  freshwater host-pathogen complexes in the interface between nature and aquaculture" for the degree of PhD.

Welcome to our GEOHYD Lunch Seminar Friday 1th of October @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Andreas Alexander, Dept. of Geosciences.

Welcome to our GEOHYD Lunch Seminar Friday 1th of October @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Andreas Alexander, Dept. of Geosciences.

Dr. Avijeet Prasad, Rosseland Centre for Solar Physics (RoCS), UiO.

In a famous paper, Geir Ellingsrud and Stein Arild Strømme use the Atiyah-Bott localization theorem in equivariant cohomology to compute the number of complex twisted cubics on a complete intersection. Motivated by results from A1-homotopy theory there is a new way of doing such enumerative counts which works over an arbitrary base field, not only the complex numbers. Recently, Marc Levine proved a version of Atiyah-Bott localization for this new way of counting.

In the talk I will recall the classical Atiyah-Bott localization theorem and explain how one can use it in enumerative geometry. Furthermore, I will explain how this new way of counting works and present some results about twisted cubics on complete intersections counted this way. This is based on joint work with Marc Levine.

Title: IPCC-AR6 Chap. 5: Global carbon and other biogeochemical cycles and feedbacks

Speaker: Joeri Rogelj, Imperial College London 

Association of lower crustal pseudotachylytes with mylonites from Nusfjord, Lofoten: A field and microstructural study

Tilstand indre Drammensfjord og historisk akkumulasjon av mikroplast i fjordsedimenter

Go on exchange to the world's northernmost campus, 78 ° north! As a science student at UiO, you can take courses at the University Center on Svalbard (UNIS) as part of your degree.