## Besøksadresse

Niels Henrik Abels hus (kart)Moltke Moes vei 35

0851 OSLO

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.

**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.

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.

Lokukaluge Prasad Perera (Department of Technology and Safety, Artic University of Norway) will give a talk on March 16th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.

Dr. Carlo Sgarra from Politecnico Milano will give a Seminar Lecture: A Gamma Ornstein-Uhlenbeck Model Driven by a Hawkes Process

Tid og sted:
22. apr. 2020–24. apr. 2020,
The Norwegian Academy of Science and Letters

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

Tid:
13. mai 2020 09:30–15. mai 2020 17:00

The 5th Scandinavian Gathering Around Remarkable Discrete Mathematics

We invite you to a two-day seminar celebrating Professor Ørnulf Borgans many and substantial contributions to statistics in general and life event history analysis in particular. The seminar takes place in Auditorium 2 in Helga Engs House, Blindern Campus, University of Oslo, from Monday May 25th 11:00 to Tuesday May 26th, 14:00, 2020.

For the seminar we have invited several of Ørnulf's key collaborators to give talks. We hope many other colleagues, students and friends will participate in this celebration of Ørnulf and his outstanding career as Professor of Statistics at the University of Oslo.

The conference is part of a joint French-Norwegian conference series on curves and surfaces. In Norway previous meetings were held in Oslo 1988, Biri 1991, Ulvik 1994, Lillehammer 1997, Oslo 2000, Tromsø 2004, Tønsberg 2008, Oslo 2012, and Tønsberg 2016. In France the last meeting was in Arcachon 2018.

The format of the conference is informal and invites discussion of ideas and work in progress.

Tid og sted:
7. sep. 2020 08:00–9. sep. 2020 16:00,
Wolfgang Pauli Institute, Vienna

On 7-9 September 2020, the conference on high-dimensional stochastics will take place at the Wolfgang Pauli Institute (WPI) in Vienna, Austria. The conference is an activity within the thematic program "Mathematics for Risk in Finance and Energy" at the WPI.

We aim to bring together an interdisciplinary group of leading researchers with interest in high dimensional stochastic modeling. Particular emphasis will be given to infinite dimensional Markov processes, SPDEs, population dynamics, high dimensional statistics and connections to financial and energy modeling. We welcome participants from academia and industry to take part in this event.

A **pre-conference PhD course** will be organized on Monday September 7. The course is related to the topics of the conference and will be given by Christa Cuchiero. More details on the course will be announced soon.

Tid og sted:
19. feb. 2020 14:15,
Undervisningsrom 819, Abel

Tittel:

*Adaptive plotting of Splines*

Tid og sted:
18. feb. 2020 10:15–11:00,
Seminar room 1120, Niels Henrik Abels hus

Tid og sted:
14. feb. 2020 14:15–15:00,
NHA 1120

Six short lectures on the connection between two ubiquitous objects in Mathematics.

Tid og sted:
11. feb. 2020 14:15–15:15,
Niels Henrik Abels hus, 8th floor

Johan Pensar (formerly Department of Mathematics and Statistics, University of Helsinki, from 01.02.2020 Department of Mathematics, University of Oslo) will give a talk on February 11th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.

Tid og sted:
10. feb. 2020 13:15–14:00,
NHA 1119

Dr. Bård Støve from the University of Bergen will give a Seminar Lecture: The local Gaussian correlation with applications to finance

Tid og sted:
7. feb. 2020 12:15–13:00,
NHA 919

**Title: **Experimental investigation of droplet trajectories and airflow above breaking waves, by Reyna Guadalupe Ramirez de la Torre

**Abstract: **Within the marine boundary layer the interaction between air and water is constant and takes different forms. An interesting example is the artic ocean spray, generated by wave impact and wind, which can cause severe icing on vessels. Understanding this phenomenon is important for the safety of people, ships and installations that operate in the arctic environment.

In this study we performed lab-scale experiments of breaking waves, to describe the trajectories of the droplets in the spray generated by wave impact and wind. Focusing waves generated by a wavemaker provided highly repeatable wave breaking events. A fan was used to produce wind within a closed section above the waves. The airflow over breaking waves was measured using Particle Image Velocimetry, while 3D Particle Tracking Velocimetry was used to reconstruct the droplets trajectories. The main objective is to understand the dynamics and characteristics of the spray cloud under different wind conditions. The results of these experiments can be an important input for simulations, and in the future assist the the development of accurate models which can be used to reduce the risk associated with icing of arctic structures.

Tid og sted:
5. feb. 2020 10:15–12:00,
room 819, NHA building

TMS guest professor Christian Voigt (University of Glasgow) is giving a mini-course on "Graphs and their quantum symmetries".

Tid og sted:
4. feb. 2020 12:15–13:45,
Abels Utsikt 12. etasje

Vi markerer at Tom har fått Olav Thon Stiftelsens nasjonale pris for fremragende undervisning, og Tom vil holde et foredrag.

Tid og sted:
29. jan. 2020 13:00–14:00,
Lunch Area on 10th floor

We welcome you to a celebration of the research grant awarded to Kristina Rognlien Dahl. Kristina will present the SCROLLER project, and cake will be served. We hope to see you there!

Tid og sted:
28. jan. 2020 14:15–15:15,
Niels Henrik Abels hus, 8th floor

Kristoffer H. Hellton (Department of Statistical Analysis, Machine Learning and Image Analysis, Norwegian Computing Center) will give a talk on January 28th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.

Tid og sted:
17. jan. 2020 13:15,
"Abels utsikt", 12. etasje, Niels Henrik Abels hus.

M.Sc. Lars Magnus Valnes ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.

*Patient-specific Modeling of the Human Brain using Magnetic Resonance Imaging*

Tid og sted:
17. jan. 2020 10:15,
"Abels utsikt", 12. etasje, Niels Henrik Abels hus.

M.Sc. Lars Magnus Valnes ved Matematisk institutt avholder prøveforelesning over oppgitt emne:

"*Parameter estimation methods in large, patient-specific bio-mechanical models*".

Tid og sted:
15. jan. 2020 09:15–15:30,
Abels Utsikt

And here we go again... with the beginning of the new year, we sparkle the kick-off of 2020 with a one-day workshop where all PhD students in Stochastics and Risk have the opportunity to present their work.

In addition we shall have two talks held by our international guests Prof. Yuliya Mishura and Prof. Kostia Ralchenko from Taras Shevchenko National University of Kyiv.

Welcome!

Tid og sted:
14. jan. 2020 14:15–15:15,
Niels Henrik Abels hus, 8th floor

Kåre Bævre (Department of Health and Inequality, Norwegian Institute of Public Health) will give a talk on January 14th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.