Hydrodechlorination of 1,2-dichloroethane on Pd-Ag catalysts supported on texture-tailored carbon xerogels

Conference (2004)

L’utilisation durable de la faune sauvage par le tourisme cynégétique. Exemple du programme régional Parc W/ ECOPAS

Conference (2004)

Isolation of genes potentially involved in biocontrol properties of Pichia anomala (strain Kh5) against Botrytis cinerea by the use of cDNA-AFLP

Conference (2004)

La loi du 28 janvier 2003 sur l'attribution du logement familial en cas de violences conjugales

Conference (2004)

Improvement by solubilization in DMPC liposomes of PPME photodynamic effect - A study in human colon cancer cells HCT-116

Conference (2004)

Le micromaser à atomes froids

Conference (2004)

Dynamical behaviour of electro-mechanical coupled problem

Conference (2004)

MEMS are very small devices in which electric as well as mechanical dynamics phenomena appear. Because of the microscopic scale, some strong coupling effects between the different physical fields appear ... [more ▼]

MEMS are very small devices in which electric as well as mechanical dynamics phenomena appear. Because of the microscopic scale, some strong coupling effects between the different physical fields appear, and some forces, which are negligible at macroscopic scales, have to be taken into account. In order to make a good design of these micro-systems, it is important to analyse the coupling between the electrical and mechanical fields. This paper concerns the modelling of the strong electromechanical coupling appearing in micro-electro-mechanical systems (MEMS). The finite element method (FEM) is used to perform dynamical analysis taking into account large mesh displacements. Analysing the vibration of microsystems is a fundamental issues in the design of a broad range of sensors and actuators. The state of the art currently consists in using staggered procedures to compute quasi-static configurations based on the iteration between a structural model loaded by electrostatic forces and an electrostatic model defined on a domain following the deformation of the structure. Staggered iteration then leads to a static equilibrium position. Performing a perturbation analysis around the static equilibrium yields the electromechanical linearized stiffness needed for computing the eigenfrequencies. Obviously, performing the perturbation analysis to evaluate the tangent stiffness for every degree of freedom leads to very high computing costs and therefore onlythe tangent stiffness associated with presumed modes (typically some purely structural modes) are computed. Such a procedure can lead to important inaccuracies for designs where the electrostatic coupling is not quasi-uniform. In our work, we have developed a fully coupled electro-mechanical formulation that allows to find static equilibrium positions in a non-staggered way and which provides fully consistent tangent stiffness matrices for vibration analysis. The efficiency of the approach will be illustrated on modes of micro-electromechanical devices. The results obtained indicate that using this approach pull-in can be computed very accurately and at low computational cost. Also the coupled electromechanical modes obtained in the vicinity of equilibrium positions can be significantly different from the approximations obtained using a structural reduction at forehand. Numerical results are checked against analytical results where appropriate. The formulation developed for the strongly coupled electromechanical problem allows consistent vibration analysis of the system and yields more accurate vibration eigenmodes and frequencies than the classical staggered approaches. A second interest of the coupled tangent matrix is the computation of the dynamical behaviour of the coupled problem when we apply suddenly a voltage to the electrodes. Even under the pull-in voltage, the overshoot of the dynamical response may reduce the distance between the plate so that the electric force becomes dominant and the plates stick together. This phenomenon is called the dynamical pull-in. We will also treat it in this research. [less ▲]

Evaluation of a registration-based range-dependence compensation method for a bistatic STAP radar using simulated, random snapshots

Conference (2004)

L’habitat mérovingien dans la vallée mosane

Conference (2004)

Comparaison de la sensibilité diagnostique des techniques de quantification du tracé électromyographique dans les atteintes radiculaires chroniques

Conference (2004)

Charakteriseiring des bronchialen remodelligs in eimen model von felinem asthma

Conference (2004)

Bronchial reactivity assessed by whole body barometric plethysmography is correlated with lower airway inflammation in cats

Conference (2004)

Modernité littéraire et Terreur. Sartre et Foucault

Conference (2004)

Innovative artificial fog production device - A technical facility for research activities.

Conference (2004)

A new innovative fog production device has been developed in close cooperation with partners of a European project called “FOG” funded by the EU. It is set up in the fog chamber of the road and bridges ... [more ▼]

A new innovative fog production device has been developed in close cooperation with partners of a European project called “FOG” funded by the EU. It is set up in the fog chamber of the road and bridges laboratory at Clermont-Ferrand. Most of the activities of this laboratory are dedicated to road safety but the facility is open to any other activity, such as environmental research. The recent developments consist in setting up a controllable device able to produce stable visibility levels and homogeneous fog, representative of various types of natural water droplet distribution. The fog characteristics were determined and compared to natural fog. Results are presented for a selection of conditions including stabilized visibility levels for dense fog, less than 50 metres meteorological visibility and two kinds of droplet distribution. [less ▲]

Plasticity in the expression of the steroid receptor coactivator-1 (SRC-1) in Japanese quail.

Conference (2004)

Application of space-time adaptive processing (STAP) to conformal arrays

Conference (2004)

Selecting the Holstein breed for functional traits in France

Conference (2004)

Pd-Ag/SiO2 and Pd-Cu/SiO2 cogelled xerogel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene

Conference (2004)

Preliminary work for the use of linkage disequilibrium in French MAS program

Conference (2004)

On Extended Finite Element Method (XFEM) for modelling of organ deformations associated with surgical cuts

Conference (2004)

Range-dependence compensation in bistatic radar STAP

Conference (2004)

Distance and location processes in memory for time : An update

Conference (2004)

Memory for times of past events depends on direct impressions of the temporal “distances” of the events in the past and the reconstruction of temporal “locations. Two studies shed light on the possible ... [more ▼]

Memory for times of past events depends on direct impressions of the temporal “distances” of the events in the past and the reconstruction of temporal “locations. Two studies shed light on the possible neurological basis of location-based processes. In an ERP study, adults performed tasks thought to bias subjects to use distance or location processes. Late frontal activity was specifically linked to location-based processes. In another study using the same tasks, aging was found to disrupt location-based processes more than distance-based processes. Age-related differences in the use of location-based processes were mediated by speed of processing and by working-memory capacities. [less ▲]

Re-Os dating of molybdenite constrains late-orogenic gneiss dome formation in the Sveconorwegian orogen, SW Scandinavia

Conference (2004)

Activity-Stability Relationships in Extremophilic Enzymes

Conference (2004)

Mise au point et application d'une technique rapide d'étude de la sensibilité variétale de la betterave vis-à-vis de Cercospora beticola et évaluation in vitro de la résistance de ce pathogène aux fongicides

Conference (2004)

Active noise insulation in frontages of buildings

Conference (2004)

Detection of fruit trees viroids and epidemiological characteristics of the disease caused by Peach Latent Mosaic Viroid in Tunisia

Conference (2004)

Impact of M. fijiensis metabolites on banana antioxidant systems

Conference (2004)

An original seismic subsurface tomography approach using fresnel volumes, a fast marching eikonal solver and a probabilistic reconstruction method

Conference (2004)

Nonrigid registration and multimodality image fusion for 3D image-guided neurosurgery

Conference (2004)

Modelling surgical cuts, retractions, and resections via Extended Finite Element Method

Conference (2004)

A canonical framework for suboptimum space-time adaptive processing (STAP), including covariance-matrix estimation and range dependence compensation

Conference (2004)

Object tracking using a combined appearance and geometric model

Conference (2004)

QTL analysis of the expression of the low-gossypol seed and high gossypol plant trait in the progeny of the Gossypium hirsutum x G. raimondii x G. sturtanium trispecific hybrid

Conference (2004)

Applicability of PCR technics to diagnosis of plant pathogens: development of a simplified "universal" protocol for sample preparation and analysis

Conference (2004)

Evaluation de la qualité des eaux des rivières luxembourgeoises à l’aide des Macrophytes (Spermatophytes et Bryophytes) (aquatiques et semi-aquatiques)

Conference (2003, December 15)

Les marqueurs de la décompensation cardiaque

Conference (2003, December 11)

Mobilité électrophorétique et agglutinabilité des érythrocytes traités avec des enzymes protéolytiques

Conference (2003, December 05)

High-Resolution Limb Observations of Proton Aurora

Conference (2003, December 01)

The interaction of precipitating protons in the upper atmosphere involves charge exchange, ionization, elastic and inelastic collisions, and the deposition of energy from the bottom of the F-region to the ... [more ▼]

The interaction of precipitating protons in the upper atmosphere involves charge exchange, ionization, elastic and inelastic collisions, and the deposition of energy from the bottom of the F-region to the D-region of the ionosphere. These processes and the transport of incident protons through this range of altitudes has been described through a variety of modeling techniques but there has been a dearth of altitude-resolved observations of proton precipitation with which to validate such models. We present new limb observations of Doppler-shifted Lyman-α proton aurora emissions obtained by the High-resolution Ionospheric and Thermospheric Spectrograph (HITS) aboard the Advanced Research and Global Observation Satellite (ARGOS) that fill this niche. HITS performs limb scans that include tangent altitudes between 90 km and 400 km with approximately 5 km vertical resolution. The Doppler shifts of the proton aurora Lyman-α emissions are measured with 1.5 Angstrom resolution and are used to infer mean energies of the incident protons as a function of altitude. Observed energy-range (dE/dz) relations are compared to those predicted by a Monte Carlo simulation of proton transport in the upper atmosphere. [less ▲]

EnCOrE (Encyclopédie de Chimie Organique Electronique): an Original Way to Represent and Transfer Knowledge from Freshmen to Researchers in Organic Chemistry

Conference (2003, December)

Las causas y las raíces del fenómeno de la violencia en el fútbol, una perspectiva sociológica

Conference (2003, December)

Executive dysfunction in dementia

Conference (2003, December)

Hypertension artérielle et néphropathie diabétique

Conference (2003, November 26)

Catheter-related Infections - Belgian epidemiological data

Conference (2003, November 20)

Estimation of surface soil organic matter by means of hyperspectral data analysis.

Conference (2003, November 19)

Data acquired from field campaign and hyperspectral airborne sensors were processed to determine the surface soil organic matter of an agricultural area located in Southern Belgium. The method adopted was ... [more ▼]

Data acquired from field campaign and hyperspectral airborne sensors were processed to determine the surface soil organic matter of an agricultural area located in Southern Belgium. The method adopted was based on a forward stepwise multiple regression analysis linking soil organic matter and hyperspectral data from two airborne sensors working in the visible and infrared domain. The results were validated successfully from an independent set of sampling points. It is concluded that the hyperspectral remote sensing approach is promising for soil organic matter prediction. Furthermore, this approach could even be improved if disturbance factors are removed. [less ▲]

Le rêve pavillonnaire et la logique du développement durable

Conference (2003, November 04)

Notions d'acoustique

Conference (2003, November)

Voix et Transsexualité, étude des paramètres subjectifs et objectifs de l'identité vocale.

Conference (2003, October 25)

Contribution à l’étude de l’écologie du Babouin de Guinée (Papio cynocephalus papio) dans le Parc National du Haut Niger (République de Guinée)

Conference (2003, October 23)

Les jeunes vus par la recherche scientifique : Base de données des recherches scientifiques et études concernant les jeunes (12 à 25/30 ans) réalisées en Communauté française de Belgique et dans l’Union européenne : Repères

Conference (2003, October 17)