Deformations of reducible representations of 3-manifold groups into PSL_2(C)

Let M a 3-manifold with torus boundary which is a rational homology circle. We study deformations of reducible representations of p_1(M) into PSL_2(C) associated to a simple zero of the twisted Alexander polynomial. We also describe the local structure of the representation and character varieties.Comment: Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol5/agt-5-40.abs.htm

Irreducible representations of knot groups into SL(n, C)

The aim of this article is to study the existence of certain reducible, metabelian representations of knot groups into SL(n, C) which generalize the representations studied previously by G. Burde and G. de Rham. Under specific hypotheses we prove the existence of irreducible deformations of such representations of knot groups into SL(n, C)

On homogeneous Hermite-Lorentz spaces

We define naturally Hermite-Lorentz metrics on almost-complex manifolds as special case of pseudo-Riemannian metrics compatible with the almost complex structure. We study their isometry groups

Dredged Marine Sediments Geotechnical Characterisation for Their Reuse in Road Construction

A large Research European Interreg IVA Program called "Sustainable Environmental Treatment And Reuse of Marine Sediment" is running in order to better understand the Channel sediment characteristics and to develop and promote sustainable management practices for marine sediments. A total of 13 sediments localized along the Manche channel were sampled and analyzed for SETARMS project. A comprehensive series of laboratory tests were performed to characterize different sediments and to class them from a geotechnical point of view according to the French standard GTR. This will be necessary to evaluate the potential use of treated sediments. Then to determine, with GTS French guide recommendations the appropriate formulation using hydraulic binders in order to improve sediments mechanical properties. This paper presents and discusses results of physical and geotechnical characterization of different sediments sampled from different French ports. Geotechnical characterization results show that sediments are classified as fine and plastic materials with low to high organic matter content. Knowing that the variability of the sediments characteristics is one of the limits to their reuse in geotechnical applications, the results will be presented and put in prospect towards this variability and the reuse of sediment as a subgrade layer

Space vector modulation technique for 3-level NPC converter with constant switching frequency

This paper presents a simple Space Vector Modulation (SVM) methodology for a three-level NPC converter. Nearest three vectors (NTV) and corresponding duty cycles are deduced through simple generic mathematical expressions. Extra degrees of freedom of NPC converter are used to fully benefit from SVM advantages and to control the switching frequency. Simulation and experimental results are presented and discussed to validate the proposed methodology.Postprint (published version