21st century skills. Recent advancements and international developments. Special Issue

in Thinking Skills and Creativity (2015), 8

- 22 février : présentation de l’ouvrage de Jean-Claude Bondol, L’écriture réaliste et ses techniques. Nana d’Emile Zola, Paris, L’Harmattan, 2020, à Bonnevoie https://youtu.be/BeWIjZYNkr0

Speeches/Talks (2020)

§§ 241-249 AktG zur Nichtigkeit und Anfechtung von HV-Beschlüssen, Kölner Kommentar zum Aktiengesetz

in Noack, Ulrich; Zöllner, Wolfgang (Eds.) Kölner Kommentar zum Aktiengesetz (2017)

„25 Jahre Integration durch Sport - weiter so?“ Erfolge, Potentiale, Herausforderungen, Grenzen

Speeches/Talks (2015)

27th International Symposium on Temporal Representation and Reasoning, {TIME} 2020, September 23-25, 2020, Bozen-Bolzano, Italy

Book published by Schloss Dagstuhl - Leibniz-Zentrum f{\"{u}}r Informatik (2020)

§§ 29, 30 und Derivate-Verordnung betreffend Risiko- und Liquiditätsmanagement

in Kapitalanlagegesetzbuch, Kommentar (2019)

2d gauge theories and generalized geometry

in Journal of High Energy Physics [=JHEP] (2014)

We show that in the context of two-dimensional sigma models minimal coupling of an ordinary rigid symmetry Lie algebra g leads naturally to the appearance of the “generalized tangent bundle” TM ≡ T M ⊕ T ... [more ▼]

We show that in the context of two-dimensional sigma models minimal coupling of an ordinary rigid symmetry Lie algebra g leads naturally to the appearance of the “generalized tangent bundle” TM ≡ T M ⊕ T ∗ M by means of composite fields. Gauge transformations of the composite fields follow the Courant bracket, closing upon the choice of a Dirac structure D ⊂ TM (or, more generally, the choide of a “small Dirac-Rinehart sheaf” D), in which the fields as well as the symmetry parameters are to take values. In these new variables, the gauge theory takes the form of a (non-topological) Dirac sigma model, which is applicable in a more general context and proves to be universal in two space-time dimensions: a gauging of g of a standard sigma model with Wess-Zumino term exists, iff there is a prolongation of the rigid symmetry to a Lie algebroid morphism from the action Lie algebroid M × g → M into D → M (or the algebraic analogue of the morphism in the case of D). The gauged sigma model results from a pullback by this morphism from the Dirac sigma model, which proves to be universal in two-spacetime dimensions in this sense. [less ▲]

2D Tool-Path Generation Method for Multi-Axis Milling Machine using ToF camera

Scientific Conference (2014, September 12)

Multi-axis machines are known for their precise production of complex parts, where multi-tool are working in the same area or static workpiece support or clamping parts, may cause collision problems. It ... [more ▼]

Multi-axis machines are known for their precise production of complex parts, where multi-tool are working in the same area or static workpiece support or clamping parts, may cause collision problems. It is therefore necessary to identify potential collision risks and avoid them in an efficient way, which may cause production stops and machinery damage. This research study has been focusing on safe non-functional (rapid) tool-path generation for multi-axis milling machine, where no efficient automatic collision avoidance solution exists (in the literature). A 3D Time of Flight (TOF) camera attached into the machine will be able to sense any unwanted situation in the manufacturing environment and provide rapid and automatic solution to detect and avoid collisions for safe tool movements during production. In the presence of obstacles, the proposed approach will provide decisions regarding tool-path correction and improvement automatically. The proposed algorithm based on 3D vision concept is also able to take into account unknown obstacle shape, size during production but dynamic aspects of the scene will be treated in future. The concept presented take into account the 3D information from the scene for traversal safe tool-paths generation for a static environment as an initial application, which will be adapted to more complex real machining scenarios by integrating it with STEP-NC technology in future. [less ▲]

3 Fragen an 4 Luxemburger Theatermacher

Speeches/Talks (2018)

A 3.2% efficient Kesterite device from electrodeposited stacked elemental layers

in Journal of Electroanalytical Chemistry (2010), 646(1-2), 52-59