Tidligere arrangementer - Side 49
Peter Guttorp (University of Washington og Norsk Regnesentral) skal snakke om
The role of statisticians in international science policy
This lecture series will be based on the introduction, chapters 1 and 2 of the book "Topics in Optimal Transportation" by Cedric Villani.
Roberto Conti , Università di Chieti-Pescara ‘G. D’Annunzio’, Italy, will give a talk on "Sectors of scaling limit nets and asymptotic morphisms".
Abstract: In the algebraic approach to 4D-QFT the main object of study is a local net, namely an isotonous correspondence between spacetime regions and operator algebras on a fixed Hilbert space satisfying physically motivated properties including Einstein causality. The so-called DHR superselection sectors of the net are then described by certain (inner equivalence classes of) *-endomorphisms of the C*-algebra of quasi-local observables. For any local net, one may also consider its associated scaling limit nets, carrying the information on the short distance limit of the given QFT (roughly, this is the algebraic version of the renormalization group). In this talk we will argue that the superselection sectors of a scaling limit net can be described in terms of suitable maps of the original theory, that are similar to the asymptotic morphisms appearing in E-theory of Connes and Higson. This is a new arena where concepts from AQFT and NCG are merged together, and provides a first step for an alternative (rigorous, model independent) approach to the notion of confinement. (This is joint work with G. Morsella).
Kukatharmini Tharmaratnam (Matematisk Institutt, Universitetet i Oslo) skal snakke om
Robust estimation for penalized regression splines
Jukka Lempa, CMA, holder et seminar med tittelen: Utility maximization with commodity futures
This lecture series will be based on the introduction, chapters 1 and 2 of the book "Topics in Optimal Transportation" by Cedric Villani.
Professor Jouko Väänänen, Helsinki, vil forelese på logikkseminaret om Dependence Logic.
Jukka Lempa,CMA, holder et seminar med tittelen:Optimal Stopping with Random Exercise Lag
This lecture series will be based on the introduction, chapters 1 and 2 of the book "Topics in Optimal Transportation" by Cedric Villani.
I extend my 2005 AG&T paper with Bruner from the circle case to more general Lie groups. There are new results about infinite cycles for actions by the torus T2 or the rotation group SO(3).
I will go through the simplest case of my 2005 AG&T paper with Bruner, showing that certain classes, in the homological homotopy fixed point spectral sequence for a circle action on a commutative ring spectrum, are infinite cycles. The idea of using an universal example may lead to generalizations for actions by tori or other Lie groups.
Rüdiger Kiesel,Uni. Essen/CMA, holder et seminar med tittelen: Market Risk Premium in Power Markets
Torben Mideksa (Cicero) skal snakke om
Electricity demand in a changing climate
We show that the hermitian K-theory of regular schemes (with 2 a unit in the ring of regular functions) is represented in the A^1-homotopy category of Morel-Voevodsky by the ind-scheme of non-degenerate Grassmanians.
Min-ge Xie, Department of Statistics, Rutgers University, skal snakke om
Confidence distribution and a Frequentist Approach to Incorporate Expert Opinions
Anders Barstad, Statistisk Sentralbyrå, skal snakke om
Explaining Changing Suicide Rates in Norway 1948-2004: The Role of Social Integration
Ingram Olkin (Department of Statistics, Stanford University) skal snakke om
Meta-Analysis: Statistical Methods for Combining the Results of Independent Studies
Chris Wikle (Department of Statistics, University of Missouri) skal snakke om
Nonlinear Dynamic Spatio-Temporal Statistical Models
This seminar will be focused on some elementary structural systems such as the cantilever beam. The cantilever is an old problem in structural mechanics already investigated by Galileo (1638) from equilibrium and strength arguments. This structural paradigm will be reconsidered here using buckling, post-buckling and inelastic theory. We will first present some fundamental buckling results for axially loaded columns. This model covers the case of a tree under its own weight or gives an answer to Babel mythology, at least from the stability theory point of view. This in-plane buckling problem in presence of distributed and concentrated axial forces has been recently exactly solved using hypergeometric functions. The post-buckling behavior associated with a nonlinear boundaryvalue problem will be also discussed using some asymptotic and numerical methods. The out-of-plane buckling problem of this cantilever beam will be further investigated. The lateral-torsiona l buckling problem of Prandtl (1899) dealing with the stability boundary of a beam loaded by its own weight and a concentrated force will be also solved. The convexity theorem of Papkovitch and Schaefer (1934) will be shown for these structural problems. The seminar will be concluded by the inelastic analysis of the beam in bending. We will show the need to develop a nonlocal plasticity law to describe the post-failure behavior of a beam in presence of softening. Wood’s paradox (1968) is overcome by using a nonlocal plasticity model. The Galileo problem is then revisited in the light of nonlocal mechanics. Applications of such theoretical studies can be found in the field of civil engineering at the macro scale (reinforced concrete design, timber beams, steel or composite beams…), but also at micro- or nano-scales including for instance nanostructures.
Challamel is Professor of Civil Engineering, University of South Brittany, Lorient, France, and Marie Curie Fellow in solid mechanics (faststoffmekanikk) at UiO (2011/2012).
Volume tracking is a popular method for the computation of two phase flow problems. In this talk we present a reformulation of volume tracking in two dimensions in terms of an explicit tracking of the interface between the two immiscible phases. This allows for a higher order accurate representation of the interface with respect to the spatial discretization while conserving the mass up to roundoff precision.
Joris Verschaeve is postdoc at the Mechanics Division, Department of Mathematics, University of Oslo.
Seminaret finner sted torsdager 10.15 - 12.00, rom B 63 i Niels Henrik Abels hus