Les perceurs de Sedan : passages de frontière et réactions belges pendant la guerre de 1870

Conference (2013, April 25)

Livret - Guide. Voyage d'étude dans l'Oriental marocain

Learning material (2013)

Ce document est utilisé comme livret-guide d'un voyage d’étude d'une semaine dans l'Oriental marocain et a pour thème la gestion de l'environnement. Ce voyage est organisé dans le cadre du Master ... [more ▼]

Ce document est utilisé comme livret-guide d'un voyage d’étude d'une semaine dans l'Oriental marocain et a pour thème la gestion de l'environnement. Ce voyage est organisé dans le cadre du Master Complémentaire en Sciences et Gestion de l’Environnement dans les Pays en Développement de l'Université de Liège. Ce livre guide contient essentiellement un résumé de toutes les problématiques environnementales abordées au cours du voyage (station d'épuration de l'eau, décharges, dégradation des sols et désertification, reboisement, parc naturel, gestion d'une oasis, aménagement du litoral, etc. [less ▲]

Use of Life Cycle Assessment in view of Eco-Design for a glass wool process

Conference (2013, April 25)

Le montage comme réponse moderne à la crise du sens

Scientific conference (2013, April 24)

Notre idée est ici de repartir de la conjoncture moderne pour étudier sous un angle renouvelé le problème du montage (à partir des textes de Kracauer, notamment) – problème qui nous semble déboucher sur ... [more ▼]

Notre idée est ici de repartir de la conjoncture moderne pour étudier sous un angle renouvelé le problème du montage (à partir des textes de Kracauer, notamment) – problème qui nous semble déboucher sur des enjeux politiques et esthétiques toujours actuels (que l’on tentera d’éclairer au fur et à mesure de l’exposé à travers quelques cas précis). Le débat autour du montage semble atteindre son maximum de vivacité dans les années 1920 (aussi bien dans les milieux intellectuels que dans les milieux artistiques). À cette époque, suite aux transformations amenées par l’essor de la société industrielle (sur le plan axiologique, sociologique ou technologique), suite à la première Guerre mondiale surtout et au déchaînement de la violence sur les individus, l’homme moderne se dépeint fréquemment sur le mode de celui qui, ayant perdu l’essentiel de ses repères, et déstabilisé dans ses croyances, se voit contraint à errer dans un monde désenchanté qu’il ne reconnaît plus. Or, ces mêmes années sont aussi celles qui voient se développer toutes sortes d’avant-gardes artistiques pour lesquelles l’opération du montage constitue un outil primordial. [less ▲]

Time variyng groundwater flux measurement using a single well tracer technique

Poster (2013, April 24)

Contaminant mass discharge measurements are often performed at given times or integrated over a certain period of time, using active or passive sampling techniques. One problem arising is that such ... [more ▼]

Contaminant mass discharge measurements are often performed at given times or integrated over a certain period of time, using active or passive sampling techniques. One problem arising is that such measurements may not be representative of the temporal dynamics of the mass discharge variations. These variations can be caused by fluctuations in contaminant concentrations or, more frequently, by changes in the groundwater fluxes. Pollutant mass fluxes are typically estimated through a combination of solute concentrations and groundwater fluxes measured across a control plane made of several multi-level wells. Accurate measurements of local transient Darcy fluxes have been recognized as the weakest points in most of the developed techniques for groundwater contaminant mass flux measurements. The main objective here is to extend the FVPDM technique for temporal monitoring of groundwater fluxes and to demonstrate its ability to be used in combination with passive sampling devices for measurement of contaminant mass fluxes in groundwater. The Finite Volume Point Dilution Method (FVPDM) is a single well tracer technique for the measurement of local groundwater fluxes based on the continuous injection of tracer at very low injection rate (Brouyère et al. 2008). These developments are based on the application of the adapted technique on a case study in a fractured granitic aquifer in Ploemeur (France). This application investigates transient groundwater fluxes that are controlled by pumping in a well nearby the tested piezometers. Long monitoring time series have been recorded under these controlled conditions of transient groundwater flow. Results show the high sensivity of the FVPDM technique to small variations in groundwater flow velocities and its aptitude for long term monitoring of groundwater fluxes. The comparison between the results of FVPDM and classical point dilution tests performed in same conditions shows close correlation. Interpretation of FVPDM tests in transient conditions have been developed together with an evaluation of the uncertainties that can happen if the frequency of the groundwater flow variations is high. The tests carried on the Ploemeur site also illustrate the first ever application of the FVPDM technique between a double-packer system used for the investigation of a defined layer of an aquifer. This innovative application of the FVPDM using packers opens concrete perspectives for investigation of vertical heterogeneities of groundwater fluxes across a well. [less ▲]

Vocal loading profiles of kindergarten and elementary school teachers

Conference (2013, April 24)

Purpose: Although a global picture exists of teachers’ voice demands in general, few studies have compared specific groups of teachers to determine whether some are more at risk than others to develop ... [more ▼]

Purpose: Although a global picture exists of teachers’ voice demands in general, few studies have compared specific groups of teachers to determine whether some are more at risk than others to develop vocal loading related dysphonia. This study compared vocal loading of kindergarten and elementary school teachers; professional and non-professional vocal load was determined for both groups. Method: Twelve kindergarten and twenty elementary school female teachers were monitored during one workweek using the Ambulatory Phonation Monitor, Model 3200 (KayPENTAX). Vocal loading parameters analyzed were phonation time, F0, SPL, distance dose and cycle dose. A total of 160 days (≈1513 hours) of collected data were analyzed. Results and conclusions: All the parameters were higher for kindergarten teachers than for elementary school teachers in both professional and non-professional environments, but the differences were significant only for the cycle dose and the distance dose (p < .05). The higher vocal load measured in kindergarten teachers suggests that they could be more at risk for developing voice disorders than elementary school teachers. Particular attention should be paid to this specific group of teachers working with young children. Concerning the comparisons between professional and non-professional voice use, significant differences were observed for all parameters (p < .0001), indicating that vocal load was higher in the professional environment for both groups. [less ▲]

Overview of technologies for mineral/metal recuperation – challenges and technological gaps

Conference given outside the academic context (2013)

Les problèmes cutanés liés aux médicaments

Conference (2013, April 23)

A Computational Homogenization Method for the Evaluation of Eddy Current in Nonlinear Soft Magnetic Composites

in Proceeding of the 9th International Symposium on Electric and Magnetic Fields, EMF 2013 (2013, April 23)

The use of the soft magnetic composite (SMC) in electric devices has increased in recent years. These materials made from a metallic powder compacted with a dielectric binder are a good alternative to ... [more ▼]

The use of the soft magnetic composite (SMC) in electric devices has increased in recent years. These materials made from a metallic powder compacted with a dielectric binder are a good alternative to laminated ferromagnetic structures as their granular mesoscale structure allows to significantly reduce the eddy current losses. Furthermore unlike the laminated ferromagnetic structures, SMC exhibit isotropic magnetic properties what makes them good candidates for manufacturing machines with 3D flux paths. The isotropy of the thermal conductivity also allows for a more efficient heat dissipation. The use of classical numerical methods such as the finite element method to study the behavior of SMC is computational very expensive. Indeed a very fine mesh would be required in order to capture fine scale variations i.e. variations at level of metallic grains whence the use of multiscale methods for modelling SMC. The application of multiscale method to study the behaviour of SMC is relatively recent. In (A. Bordianu et al “A Multiscale Approach to Predict Classical Losses in Soft Magnetic Composites”, IEEE Trans. Mag., vol. 48, no. 4, 2012.), the authors used a homogenization technique to compute electrical and magnetic constitutive laws on a representative volume element (RVE). These laws were then used in finite element computations. Herein, the RVE has been chosen to account for the grain- grain contact that can occur in a actual SMC structure due to the compaction process and that can lead to the appearance of macroscale eddy currents. In this paper, we will extend the computational homogenization method success- fully used for modelling the behaviour of laminated ferromagnetic cores in mag- netodynamics (I. Niyonzima et al “Computational Homogenization for Laminated Ferromagnetic Cores in Magnetodynamics”, in Proc. of the 15th Biennal Confer- ence on Electromagnetic Field Computation, 2012) to the case of SMC. The method is based on the heterogeneous multiscale method (HMM) and couples two types of problems: a macroscale problem that captures the slow variations of the overall so- lution and many microscale problems that allow to determine the constitutive laws at the macroscale. The choice of RVE will also be discussed. [less ▲]

Characterization of the extracellular proteome of Escherichia coli according to the scale-up of bioprocesses and correlation with membrane permeability

Poster (2013, April 23)