Arrangementer

Vi inviterer til programkaffe – nå på zoom.

***

We invite you all to program coffee – now on zoom.

M.Sc. Andreas Brandsæter ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.

Data-driven methods for multiple sensor streams, with applications in the maritime industry

The seminar lecture is cancelled due to epidemic situation in Norway.

Due to travel restrictions related to the spread of Covid-19, the talk of  Lokukaluge Prasad Perera (Department of Technology and Safety, Artic University of Norway), supposedly held on March 16th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor, has been CANCELLED.

Tittel:

X-ray measurements of granular flows

Tittel: 

Roberto Conti (Sapienza University of Rome, Italy) will give a seminar  talk on 

              Connes isometries of the Cuntz algebras

Title: Numerical studies of rheology and elasticity, by Prof Luca Brandt, Linnè FLOW Centre and SeRC (Swedish e-Science Research Centre), Department of Engineering Mechanics, KTH, Stockholm.

In my talk I will discuss the use of topological methods in the analysis of neural data. The key idea is to associate a space to the data set and then determine its shape by using persistent homology. In this way we have obtained good state spaces for Head Direction Cells and Grid Cells. Topological decoding shows how neural firing patterns determine behaviour.This is an interesting local to global situation which gives rise to some reflections. Based on very recent experimental results from the Moser-Lab at NTNU we show that the state space of a population of grid cells is a two dimensional torus!

Coffee, tea and biscuits from 14.00

Morten Hjorth-Jensen (Department of Physics, University of Oslo and Department of Physics and Astronomy, Michigan State University, USA) will give a talk on March 3rd at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.

Abstract:

In 1823 Niels Henrik Abel published a paper with title "Oplösning af et par opgaver ved hjelp af bestemte integraler," (Solution of a couple of problems by means of definite integrals), Magazin for Naturviden-skaberne, Aargang I, Bind 2, Christiania, which did not appear in French translation until 1881. Here he presented a complete framework for fractional-order calculus with appropriate notation for non-integer-order integration and differentiation. This seems to have been unknown until discussed in Podlubny, Magin, Trymorush, "Niels Henrik Abel and the birth of fractional calculus," Fractional Calculus and Applied Analysis, pp. 1068-1075, 2017.

I will give an introduction to non-integer order calculus and Abel's derivation of it. This will be done by going through his 1823 paper showing how he assumes a generalization of both Cauchy's formula for repeated integration and the fundamental theorem of calculus. In addition I will show how fractional calculus can be used to derive fractional-order partial differential wave equations. They have solutions with power-law attenuation which matches measurements in the complex media of medical ultrasound and elastography as well as in sediment acoustics and seismics.

Tittel: 

Haakon Bakka (formerly Computer Electrical Mathematical Science and Engineering Division, King Abdullah University of Science and Technology, KSA, from 01.02.2020 Department of Mathematics, University of Oslo) will give a talk on February 25th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.

Tittel:

Adaptive plotting of Splines