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Dieser Band enthält Kurzfassungen der Beiträge zur MKWI 2010. Die Vollversionen der Beiträge sind auf dem wissenschaftlichen Publikationenserver (GoeScholar) der Georg-August-Universität Göttingen und über die Webseite des Universitätsverlags unter http://webdoc.sub.gwdg.de/univerlag/2010/mkwi/ online verfügbar und in die Literaturnachweissysteme eingebunden.
We present results of lattice QCD simulations with mass-degenerate up and down and mass-split strange and charm (Nf = 2+1+1) dynamical quarks using Wilson twisted mass fermions at maximal twist. The tuning of the strange and charm quark masses is performed at three values of the lattice spacing a ~ 0:06 fm, a ~ 0:08 fm and a ~ 0:09 fm with lattice sizes ranging from L ~ 1:9 fm to L ~ 3:9 fm. We perform a preliminary study of SU(2) chiral perturbation theory by combining our lattice data from these three values of the lattice spacing.
We compute the static-light baryon spectrum with Nf = 2 flavors of sea quarks using Wilson twisted mass lattice QCD. As light valence quarks we consider quarks, which have the same mass as the sea quarks with corresponding pion masses in the range 340MeV<∼ mPS<∼ 525MeV, as well as partially quenched quarks, which have the mass of the physical s quark. We extract masses of states with isospin I = 0,1/2,1, with strangeness S = 0,−1,−2, with angular momentum of the light degrees of freedom j = 0,1 and with parity P = +,−. We present a preliminary extrapolation in the light u/d and an interpolation in the heavy b quark mass to the physical point and compare with available experimental results.
The isospin, spin and parity dependent potential of a pair of static-light mesons is computed using Wilson twisted mass lattice QCD with two flavors of degenerate dynamical quarks. From the results a simple rule can be deduced stating, which isospin, spin and parity combinations correspond to attractive and which to repulsive forces.
The QCD phase diagram as a function of temperature, T, and chemical potential for baryon
number, mB, is still unknown today, due to the sign problem, which prohibits direct Monte Carlo
simulations for non-vanishing baryon density. Investigations in models sharing chiral symmetry
with QCD predict a phase diagram, in which the transition corresponds to a smooth crossover at
zero density, but which is strengthened by chemical potential to turn into a first order transition
beyond some second order critical point. This contribution reviews the lattice evidence in favour
and against the existence of a critical point.
AKUE is developed by the e-learning centre of the University of Frankfurt, studiumdigitale, and is a procedure to assure high quality levels of e-learning course design and digital media production. The name AKUE stands for the German words for analysis, concept, implementation and evaluation and describes the four phases of the process. Background of AKUE is the fact, that costs and benefits of e-learning courses are difficult to be quantified. Therefore so called procedure (or process) models are applied in order to improve the quality and effectiveness of e-learning courses. This paper presents the process and steps of AKUE and gives examples for its application.
In: conference proceedings, edulearn 2010, Barcelona 5.-7.7.2010.
In order to design and tutor online and blended learning courses, trainers and teachers need to obtain appropriate qualification. In this paper different competency models for online teaching which developed in Germany 2005 – 2008 will be addressed as well as different settings to qualify teachers and trainers appropriately. Finally the results of an evaluation of two different training settings will be presented in order to compare an in house versus a transorganisational training program.