Conjugate gradient solvers on Intel Xeon Phi and NVIDIA GPUs

Lattice Quantum Chromodynamics simulations typically spend most of the runtime in inversions of the Fermion Matrix. This part is therefore frequently optimized for various HPC architectures. Here we compare the performance of the Intel Xeon Phi to current Kepler-based NVIDIA Tesla GPUs running a conjugate gradient solver. By exposing more parallelism to the accelerator through inverting multiple vectors at the same time, we obtain a performance greater than 300 GFlop/s on both architectures. This more than doubles the performance of the inversions. We also give a short overview of the Knights Corner architecture, discuss some details of the implementation and the effort required to obtain the achieved performance.Comment: 7 pages, proceedings, presented at 'GPU Computing in High Energy Physics', September 10-12, 2014, Pisa, Ital

Persönlichkeit, politische Involvierung und politische Partizipation in Deutschland und Österreich

This article investigates how the so-called Big Five indirectly affect involvement in electoral and non-electoral modes of participation by looking at political knowledge and interest as well as internal efficacy. The analyses rely on data collected by the Austrian (AUTNES) and the German Election Studies (GLES) using path models. Thus, they allow comparison of personality effects in Germany and Austria. Our results show that extraversion and openness to experience are central preconditions of political participation, which have an indirect effect mediated by political involvement. In addition, variation in the causal patterns across the two countries suggests that context matters

Noble internal transport barriers and radial subdiffusion of toroidal magnetic lines

Single trajectories of magnetic line motion indicate the persistence of a central protected plasma core, surrounded by a chaotic shell enclosed in a double-sided transport barrier : the latter is identified as being composed of two Cantori located on two successive "most-noble" numbers values of the perturbed safety factor, and forming an internal transport barrier (ITB). Magnetic lines which succeed to escape across this barrier begin to wander in a wide chaotic sea extending up to a very robust barrier (as long as L<1) which is identified mathematically as a robust KAM surface at the plasma edge. In this case the motion is shown to be intermittent, with long stages of pseudo-trapping in the chaotic shell, or of sticking around island remnants, as expected for a continuous time random walk.Comment: TEX file, 84 pages including 32 color figures. Higher quality figures can be seen on the PDF file at http://membres.lycos.fr/fusionbfr/JHM/Tokamap/JSP.pd

Meeting Certification Requirements for Teacher Certification through the Basic Course

This article explains how one institution of higher education designed their basic course to include communication proficiency for teachers as an integral part of the course. Features of the course include the following standardized assessments: a 60-question multiple-choice exam to assess cognitive proficiency; a one-on-one interpersonal encounter to assess interpersonal proficiency; a speech to inform to assess public speaking proficiency; and the use of the Steinbrecher-Willmington Listening Test to assess listening