Calendar of Physics Talks Vienna

Impact of rotation-driven particle repopulation on the thermal evolution of pulsars
Speaker:Rodrigo Picanco Negreiros (Johann Wolfgang Goethe University, Frankfurt)
Abstract:Driven by the loss of energy, isolated rotating neutron stars (pulsars) are gradually slowing down to lower frequencies, which monotonically increases the tremendous compression of the matter inside of them. This increase in compression changes both the global properties of rotating neutron stars as well as their hadronic core compositions. Both effects may register themselves observationally in the thermal evolution of such stars, as demonstrated in this work. We also find that the rotation-driven direct Urca process can comfortably explain the temperatures observed for the neutron star in Cas A provided the mass of this neutron star is assumed to be around 1.5 -- 1.9 \msun.
Date: Tue, 08.05.2012
Time: 12:30
Duration: 60 min
Location:University of Vienna, Institute for Theoretical Physics, Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room
Contact:Vienna Theory Lunch Seminar (http://www.univie.ac.at/lunch-seminar/)

The Outer Surface, Ultra-thin Films and Interfaces by HS - LEIS
Speaker:Prof. Dr. Hidde H. Brongersma (ION-TOF GmbH / Eindhoven University of Technology / Imperial College (London))
Abstract:The outermost atoms of a surface largely control processes such as catalysis and layer growth. While analytic tools (such as XPS) probe an average of many atomic layers, LEIS can selectively and quantitatively analyze the atomic composition of the outer atoms. For oxides it is even possible to determine the oxidation states of the cations in the outer atomic layer. Nowadays, LEIS can also be used for non-destructive (“static”) high-resolution in-depth analysis down to about 5-10 nm below the surface. The High-Sensitivity LEIS, that we developed at the Eindhoven University of Technology is the basis of a new generation of LEIS instruments (the Qtac100) developed at ION-TOF. Using imaging and parallel detection techniques the sensitivity of the LEIS technique has been increased by several orders of magnitude. In addition, increased sensitivity for light elements, improved mass resolution for heavier elements and imaging have opened new applications. Since LEIS is rather insensitive to the roughness of a surface, it bridges the gap between highly-dispersed catalysts and model systems. After an introduction of the technique and its new features, applications will be discussed where valuable quantitative information has been obtained that is impossible (or very difficult) to obtain with other analytic techniques. The new possibilities will be illustrated with applications to the understanding of the performance of catalysts, solid oxide fuel cells, ALD growth of ultra-thin layers and nanoclusters. Today the focus will be on oxides.
Date: Tue, 08.05.2012
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Ao.Univ.Prof. Dr. Wolfgang Werner

Speaker:André Hoang (Univ.Wien)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 10.05.2012
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien
Contact:H. Neufeld

Nuclear reaction calculations with TALYS code
Speaker:Dr. Arjan Koning (E141)
Date: Fri, 11.05.2012
Time: 14:00
Location:Sem. 138A
Contact:H. Leeb

Basic Properties of Complex Networks
Speaker:Benedikt Fuchs (Med.Univ. Wien)
Abstract:im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme"(Univ.Wien) und "Analyse Komplexer Systeme"(Med.Univ.Wien)
Date: Fri, 11.05.2012
Time: 14:15
Duration: 90 min
Location:Medizinische Universität Wien, Informatikbibliothek Bauteil 88, E 03, Spitalgasse 23
Contact:H. Hüffel, Stefan Thurner

What we really know about dark energy
Speaker:Ruth DURRER (Département de Physique Théorique, Université de Genève)
Date: Fri, 11.05.2012
Time: 15:30
Location:TU Wien Atominstitut, Hörsaal, Stadionallee 2, 1020 Wien
Contact:H. Abele