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See detailInfluence of atmospheric turbulence on the performance and design of GENIE
Absil, Olivier ULg; den Hartog, Roland; Gondoin, Philippe et al

in Traub, Wesley; Monnier, John; Schöller, Markus (Eds.) New Frontiers in Stellar Interferometry (2004, October 01)

Two competitive design studies for the Ground-based European Nulling Interferometer Experiment (GENIE) have been initiated by the European Space Agency and the European Southern Observatory in November ... [more ▼]

Two competitive design studies for the Ground-based European Nulling Interferometer Experiment (GENIE) have been initiated by the European Space Agency and the European Southern Observatory in November 2003. The GENIE instrument will most probably consist of a two-telescope Bracewell interferometer, using the 8-m Unit Telescopes and/or the 1.8-m Auxiliary Telescopes of the VLTI, and working in the infrared L' band (3.5 - 4.1 microns). A critical issue affecting the overall performance of the instrument is its capability to compensate for the phase and intensity fluctuations produced by the atmospheric turbulence. In this paper, we present the basic principles of phase and intensity control by means of real-time servo loops in the context of GENIE. We then propose a preliminary design for these servo loops and estimate their performance using GENIEsim, the science simulation software for the GENIE instrument. [less ▲]

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See detailThe simulated detection of low-mass companions with GENIE
den Hartog, Roland H; Absil, Olivier ULg; Gondoin, Philippe A et al

in Traub, Wesley; Monnier, John; Schöller, Markus (Eds.) New Frontiers in Stellar Interferometry (2004, October 01)

The prime objective of GENIE (Ground-based European Nulling Interferometry Experiment) is to obtain experience with the design, construction and operation of an IR nulling interferometer, as a preparation ... [more ▼]

The prime objective of GENIE (Ground-based European Nulling Interferometry Experiment) is to obtain experience with the design, construction and operation of an IR nulling interferometer, as a preparation for the DARWIN / TPF mission. In this context, the detection of a planet orbiting another star would provide an excellent demonstration of nulling interferometry. Doing this through the atmosphere, however, is a formidable task. In this paper we assess the prospects of detecting with nulling interferometry on ESO's VLTI, low-mass companions in orbit around their parent stars. With the GENIE science simulator (GENIEsim) we can model realistic detection scenarios for the GENIE instrument operating in the VLTI environment, and derive detailed requirements on control-loop performance, IR background subtraction and the accuracy of the photometry calibration. We analyse the technical feasibility of several scenarios for the detection of low-mass companions in the L'-band. [less ▲]

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See detailHolographic interferometry with photorefractive crystals. Early experiments and results of the ongoing european project PHIFE
Georges, Marc ULg; Thizy, Cédric ULg; Lemaire, Philippe et al

in Dantec Ettemeyer 11th International User Meeting (2004, October)

Photorefractive crystals offer many advantages over other classical holographic recording media. They allow fast in-situ processable holographic recording as well as indefinite reusability. Moreover high ... [more ▼]

Photorefractive crystals offer many advantages over other classical holographic recording media. They allow fast in-situ processable holographic recording as well as indefinite reusability. Moreover high signal-to-noise ratio can be reached as well as high resolutions. We present several types of holographic instruments using such materials. Here we will emphasize their applications in vibration measurements. A first one is based on the classical stroboscopic technique, a second one uses a pulsed laser. We describe also the recent results obtained in the framework of the european project PHIFE (Pulsed Holographic Interferomete for the analysis of Fast Events), aiming at developing a full field measurement system of vibrations modes at high repetition rate. [less ▲]

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See detailEffect of inhaled fluticasone on airway reactivity and inflammation in cats.
Kirschvink, N.; Leemans, J.; Delvaux, F. et al

in 22nd Veterinary and Comparative Respiratory Society Symposium - Montreal- Canada - Octobre 2004 (2004, October)

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See detailA new training simulator for improved voltage control of the Hydro-Québec system
Van Cutsem, Thierry ULg; Hassé, Gaëtan; Moors, Cédric et al

(2004, October)

This paper reports on the development of a training simulator focusing on voltage control and stability. It has been derived from a quasi steady-state simulation software already used and validated in ... [more ▼]

This paper reports on the development of a training simulator focusing on voltage control and stability. It has been derived from a quasi steady-state simulation software already used and validated in planning and operational planning studies. The computational engine has been provided with a user interface built on the client-server architecture, allowing the simulator to run on a network of PCs in a very flexible way. New displays can be set up easily and quickly. This tool is presently used by Hydro-Québec to improve the operator’s ability to control transmission voltages. Other features, uses and benefits are reported. [less ▲]

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See detailEffect of inhaled fluticasone on airway reactivity and 8-Iso-PGF2 in bronchoalveolar lavage fluid of cats
Kirschvink, N.; Leemans, J.; Delvaux, François ULg et al

in 5th China - France Pharmacological Joint Symposium - Beijing - France - Octobre 2004 (2004, October)

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See detailComparaison de différentes méthodes de détermination des teneurs en éléments majeurs et traces dans les sols.
Colinet, Gilles ULg; Baize, Denis; Delcarte, Emile et al

in Actes des 8emes JNES (2004, October)

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See detailDevelopment of Advanced Driver Assistance Systems by means of the traffic flow simulation tool PELOPS with HiL-functionalities
Christen, Fréderic ULg; Benmimoun, A.; Breuer, K. et al

in Berechnung und Simulation im Fahrzeugbau (2004, September 29)

During the last years a rapid increase of traffic volume in association with limited road space could be observed. This led to a raising load of the driver while achieving his driving tasks. Therefore so ... [more ▼]

During the last years a rapid increase of traffic volume in association with limited road space could be observed. This led to a raising load of the driver while achieving his driving tasks. Therefore so called Advanced Driver Assistance Systems (ADAS) are under development in recent years with an upward tendency. Such systems will relieve the driver and improve safety on the road in the future. A rising number of computed-aided-simulation becomes important for the development and evaluation of such systems. Developing ADAS makes a specific demand on the simulation environment. ADAS interact strongly with their traffic environment. Therefore the simulation has to cover both, a detailed model of the ego vehicle and an adequate representation of the traffic environment. The traffic flow simulation program PELOPS meets these requirements. The newly implemented extension of PELOPS with techniques of Software- and Hardware-in-the-Loop-simulation (SiL- and HiL-simulation) allows system developers a fast functional check and an assessment of new ADAS. External software can be linked to PELOPS via Ethernet-based network communication, which has already been realised for the widely used development tool MATLAB/Simulink. Besides the Ethernet interface PELOPS-HiL (PHIL) gives the developer two other possibilities for providing a HIL-environment: a serial interface which can be used for a connection to a dSpace development platform and a CAN data bus interface. The following article describes by means of chosen examples how flexible the PHIL-simulation can be adapted to a development task and which results can be obtained. [less ▲]

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See detailOptimisation of poly(2-(dimethylamino)ethyl methacrylate)-co-poly(ethyleneglycol) /DNA complexes designed for cell transfection
Grandfils, Christian ULg; Emonds-Alt, J

in Proceeding BRG XIIth International Workshop on Bioencapsulation Meeting (2004, September 24)

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See detailUtilization of a probiotic-hemicellulases combination to prevent effects of Salmonella contamination of broilers
Dubois Dauphin, Robin ULg; Vandeplas, Sabrina ULg; Welling, Gjalt W. et al

in Proceedings of the Ninth Conference on Food Microbiology (2004, September 16)

The aim of this study was to determine the effectiveness of a combination probiotic - hemicellulases by its relative incidence on gastrointestinal (GI) tract microbiota, correlated to the animal ... [more ▼]

The aim of this study was to determine the effectiveness of a combination probiotic - hemicellulases by its relative incidence on gastrointestinal (GI) tract microbiota, correlated to the animal performances during the growing period of broilers infected or not with Salmonella typhimurium [less ▲]

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See detailLa qualité des froments d'hiver en 2004?
Sinnaeve, Geoges; Lenartz, J.; Vancutsem, Françoise ULg et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2004, September 09)

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See detailLe froment d'hiver
Couvreur, Luc; Vancutsem, Françoise ULg; Bodson, Bernard ULg et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2004, September 09)

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See detailEscourgeon et Orge d'hiver fourragers
Monfort, Bruno; Herman, Jean-Luc; Bodson, Bernard ULg et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2004, September 09)

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See detailThe Polarization Evolution of the Optical Afterglow of GRB 030329
Greiner, J.; Klose, S.; Reinsch, K. et al

in GAMMA-RAY BURSTS: 30 YEARS OF DISCOVERY (2004, September 01)

We report 31 polarimetric observations of the afterglow of GRB 030329 with high signal-to-noise and high sampling frequency. The data imply that the afterglow magnetic field has small coherence length and ... [more ▼]

We report 31 polarimetric observations of the afterglow of GRB 030329 with high signal-to-noise and high sampling frequency. The data imply that the afterglow magnetic field has small coherence length and is mostly random, probably generated by turbulence. [less ▲]

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See detailOPEN-LOOP STABILIZATION OF 2D IMPACT JUGGLING
Ronsse, Renaud; Lefèvre, Philippe; Sepulchre, Rodolphe ULg

in Proceedings of 6th IFAC Symposium on Nonlinear Control Systems (2004, September)

The paper studies the properties of a sinusoidally vibrating wedge billiard as a model for 2D impact juggling. It is shown that some periodic orbits that are unstable in the elastic xed wedge become ... [more ▼]

The paper studies the properties of a sinusoidally vibrating wedge billiard as a model for 2D impact juggling. It is shown that some periodic orbits that are unstable in the elastic xed wedge become exponentially stable in the (non-)elastic vibrating wedge. These orbits are linked with some classical juggling patterns, providing an interesting benchmark for the study of the frequency-locking properties in human rhythmic tasks. [less ▲]

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See detailEchocardiography as an aid in the diagnosis of pulmonary thrombo-embolism
Van Israel, N.; Clercx, Cécile ULg; Else, R. W.

in 14th ESVIM Meeting - Barcelona - Espagne (2004, September)

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See detailSTABILIZATION THROUGH WEAK AND OCCASIONAL INTERACTIONS : A BILLIARD BENCHMARK
Gerard, Manuel; Sepulchre, Rodolphe ULg

in Proceedings of the 6th IFAC Symposium on Nonlinear Control Systems (2004, September)

The paper addresses the stabilization of periodic orbits in a wedge billiard with actuated edges. It is shown how the rich dynamical properties of the open-loop dynamics, e.g. ergodicity properties and ... [more ▼]

The paper addresses the stabilization of periodic orbits in a wedge billiard with actuated edges. It is shown how the rich dynamical properties of the open-loop dynamics, e.g. ergodicity properties and KAM curves, can be exploited to design robust stabilizing feedbacks with large basins of attraction. [less ▲]

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See detailPerformance increase of carbon dioxide refrigeration cycle with the addition of parallel compression economization
Bell, Ian ULg

in Proceedings of the 6th IIR Gustav Lorenzen Natural Working Fluids (2004, September)

In the future, it would be preferable to replace the halocarbon refrigerants with natural refrigerants like carbon dioxide, but there have been concerns over the use of carbon dioxide as a refrigerant due ... [more ▼]

In the future, it would be preferable to replace the halocarbon refrigerants with natural refrigerants like carbon dioxide, but there have been concerns over the use of carbon dioxide as a refrigerant due to its perceived inefficiency. It is possible to partially overcome this problem by the manipulation of the cylinders of the compressors used in the vapor compression refrigeration cycle. If some of the cylinders are used to compress vapor in a parallel compression system from an intermediary pressure, a refrigerating effect and COP greater than that of the system with all of the cylinders on suction can be achieved. An analytic model was created that allowed environmental and physical parameters to be altered. The investigations also included experimentation with the addition of superheat for the primary compression path, for which performance increases were noted for some operating conditions. The primary focus of the research was for the use of carbon dioxide in a standard air conditioning application. Accordingly, evaporation and condensation pressures were selected to correspond closely with evaporation and condensation temperatures for other refrigerants. Under the conditions used for the following research, superheating did not improve efficiency, and was not included. Physical limitations placed on the ratio of the suction cylinder swept volume to the economized cylinder swept volume suggest that building this economized compressor would be feasible. In fact, a standard reciprocating compressor could be altered such that 2 to 4 cylinders, depending on the volumetric ratio, are used for the economized path. The research demonstrates that under some conditions an economized carbon dioxide system outperforms a similar halocarbon system in terms of efficiency and capacity. In the end, this is the litmus test that proves that carbon dioxide can compete on the level with popular halocarbon refrigerants in this economized mode. [less ▲]

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See detailDetection of defects on fruits by machine vision and unsupervised segmentation
Kleynen, Olivier; Destain, Marie-France ULg

in AgEng 2004 Conference (2004, September)

Defect detection on fruits by machine vision is a complex task. Indeed, the sound tissue colour is not uniform and the defects present a wide variability in colour, shape and texture. Mostly often, images ... [more ▼]

Defect detection on fruits by machine vision is a complex task. Indeed, the sound tissue colour is not uniform and the defects present a wide variability in colour, shape and texture. Mostly often, images are acquired by conventional RGB cameras and defect segmentation is performed by algorithms based on Bayes' rules. The efficiency of these methods can be improved firstly by acquiring images with a dedicated vision system (multi-spectral imager) and secondly by implementing unsupervised segmentation methods (method derived from the 'mean shift' procedure of Camaniciu and Meer, 2002). [less ▲]

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See detailA three-dimensional electrostatic actuator with a locking mechanism for a new generation of atom chips
Gollasch, CO; Moktadir, Z; Kraft, Michael ULg et al

in Proceedings of "MME 2004 Conference, Belgique - Septembre 2004" (2004, September)

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See detailChemo-Mechanical Modelling of Soil or Rock Degradation
Charlier, Robert ULg; Boukpeti, N.

in 2nd Int. Symposium on Continuous and Discontinuous Modelling of Cohesive Frictional Materials. (2004, September)

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See detailWhole-body barometric plethysmography in healthy dogs: effect of sedation on basal respiratory variables and during histamine challenge
Talavera, J.; Kirschvink, N.; Clercx, Cécile ULg

in 14th ESVIM Meeting - Barcelona - Espagne (2004, September)

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See detailLupin seeds as a substitute to soybean in broiler chiken feeding : incorporation level and enzyme preparation effects on performances, digestibility and meat composition.
Froidmont, Eric; Beckers, Yves ULg; Dehareng, frédéric et al

in 55th Meeting of European Association of Animal Production (2004, September)

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See detailDesign and simulation of a spring-less micro switch
Kiang, Kian Shen; Houlihan, Ruth; Gindila, Mircea et al

in 15th European Workshop on Micromechanics, MME 2004 (2004, September)

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See detailUtilization of a probiotic-hemicellulases combination to prevent effects of Samonella contamination of broilers.
Dubois Dauphin, Robin ULg; Vandeplas, Sabrina ULg; Welling, Gjalt et al

in Proceeding of the 9th Conference on Food Microbiology, University of Gent (Belgium), September 16-17, 2004 (2004, September)

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See detailA high-performance accelerometer with a fifth-order sigma--delta modulator
Dong, Yufeng; Kraft, Michaël ULg; Gollasch, Carsten O.

in 15th European Workshop on Micromechanics, MME 2004 (2004, September)

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See detailUltimate strength of aluminium stiffened panels: Sensitivity analysis
Rigo, Philippe ULg; Sarghiuta, R.; Otelea, C. et al

in PRADS’2004, 9th Int. Symposium on Practical Design of Ships and other Floating Structures, Germany, Seehafen Verslag GmbH, Hambourg, vol.1, Sept. 2004 (2004, September)

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See detailLong term outcome in dogs with sinonasal aspergillosis treated with intranasal infusion of enilconazole
Schuller, S.; Clercx, Cécile ULg

in 14th ESVIM Meeting - Barcelona - Espagne (2004, September)

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See detailEffect of Welding on Ultimate Compressive Strength of Aluminium Stiffened Panels
Rigo, Philippe ULg; Richir, T.; Toderan, C. et al

in HIPER’2004, High Performances Marine Vehicules (2004, September)

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See detailIntegration of a two-dimensional electrostatic actuator in a new generation of atom chips
Gollasch, Carsten O.; Moktadir, Zakaria; Koukharenko, Elena et al

in Eurosensors XVIII, 18th European Conference on Solid-State Sensors (2004, September)

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See detailValidating Blade Vibration Amplitudes from Blade Tip-Timing Data Analysis
Gallego-Garrido, Jon; Dimitriadis, Grigorios ULg

in Vibrations in Rotating Machinery (2004, September)

Blade Tip-Timing (BTT) is a method for the measurement of blade vibration in rotating bladed assemblies such as those found in turbomachinery. BTT data needs to be analysed by specially formulated methods ... [more ▼]

Blade Tip-Timing (BTT) is a method for the measurement of blade vibration in rotating bladed assemblies such as those found in turbomachinery. BTT data needs to be analysed by specially formulated methods, to yield the vibration frequencies and amplitudes. Although such methods have been shown to recover frequencies successfully, they have not been validated experimentally for amplitude recovery. In the present paper an improved experimental procedure for amplitude measurement is described. The paper presents a comparison between the experimental observation of the blade vibration amplitudes and the answers obtained from the BTT data analysis methods, providing experimental evidence of the ability of these methods to extract the correct blade vibration amplitudes from BTT data. [less ▲]

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See detailFringe capacitance models for MEMS devices
Houlihan, Ruth; Kraft, Michaël ULg

in 15th European Workshop on Micromechanics, MME 2004 (2004, September)

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See detailControl of Listeria monocytogenes in dairy farms.
Di Tanna, Sybille ULg; Belleflamme, Christel ULg; Anceau, Christine ULg et al

in Proceedings of the Ninth conference on food microbiology (2004, September)

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See detailIndices of oxidative stress in a feline model of asthma : 8-Iso-PGF2 in bronchoalveolar lavaeg and H2O2 in exhaled breath condensate
Kirschvink, N.; Fievez, Laurence ULg; Leemans, J. et al

in 14th ERS Annual Congress (2004, September)

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See detailSensor network design using genetic algorithm
Gerkens, Carine ULg; Heyen, Georges ULg

(2004, September)

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See detailSolid-state electronic interface for a levitated disc accelerometer
Gindila, Mircea V.; Kraft, Michaël ULg; Houlihan, Ruth et al

in Eurosensors XVIII, 18th European Conference on Solid-State Sensors (2004, September)

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See detailOn the solution of the aeroelastic galloping problem
Vio, Gareth Arthur; Dimitriadis, Grigorios ULg; Cooper, Jonathan Edward

in Proceedings of the 2004 International Conference on Noise and Vibration Engineering (2004, September)

A global stability analysis of the transverse galloping of a square section beam in a normal steady ow was performed. The analysis was applied to a mathematical model using experimentally measured ... [more ▼]

A global stability analysis of the transverse galloping of a square section beam in a normal steady ow was performed. The analysis was applied to a mathematical model using experimentally measured stationary aerodynamic forces. The system was modelled as an ordinary differential equation with small non-linearity in the velocity term. Three methods are used for the stability analysis: 1. a harmonic balance approach, 2. normal form theory, 3. cell mapping. The resulting stability predictions were compared with each other and with results obtained from numerical integration. It is shown that the hysteretic stability of the non-linear aeroelastic oscillator was captured by all the methods. Additionally, the methods had a varying degree of success in predicting the amplitude of limit cycle oscillations undergone by the aeroelastic oscillator. [less ▲]

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See detailBronchial reactivity assessed by whole body barometric plethymography is correlated with lower airway inflammation in cats
Kirschvink, N.; Leemans, J.; Delvaux, François ULg et al

in 14th ESVIM Meeting - Barcelona - Espagne (2004, September)

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See detailStability and Limit Cycle Oscillation Amplitude Prediction for Multi-DOF Aeroelastic Systems with Piecewise Linear Non-Linearities
Dimitriadis, Grigorios ULg; Vio, Gareth Arthur; Cooper, Jonathan Edward

in Proceedings of the 2004 International Conference on Noise and Vibration Engineering (2004, September)

Discontinuous non-linearities such as freeplay and bilinear stiffness are often encountered in aeroelastic systems, sometimes as a result of wear and tear. It is important to predict the effect of such ... [more ▼]

Discontinuous non-linearities such as freeplay and bilinear stiffness are often encountered in aeroelastic systems, sometimes as a result of wear and tear. It is important to predict the effect of such non-linearities on the dynamic behaviour of a system, so that adequate safety guidelines can be drafted. As a consequence, the prediction of the bifurcation behaviour of a system featuring a discontinuous nonlinearity is crucial. Additionally, the post-bifurcation behaviour of the system is also of interest since it may consist of relatively harmless Limit Cycle Oscillations (LCO) of low amplitude or of unexpected catastrophic high amplitude LCOs. In this paper the bifurcation and post-bifurcation behaviour of a simulated Multi-DOF aeroelastic system with bilinear and freeplay nonlinearities are investigated using the Harmonic Balance method and a novel method for the prediction of the bifurcation conditions and LCO amplitudes. The method is based on the fact that the nonlinearities investigated are piecewise linear. The ratios of the real parts of the system eigenvalues in the various ranges of the bilinear spring are used in order to infer LCO amplitude information. By means of a demonstration on a simulated aeroelastic system with piece-wise linear stiffness, it is shown that the proposed approach is successful in yielding the full bifurcation and post-bifurcation behaviour of the system. Comparison of the amplitude predictions obtained from the Harmonic Balance technique and the Piecewise Linearisation proposed approach show that the latter are more consistent and closer to the true amplitudes throughout the airspeed range. The bifurcation analysis is extended to the special case where the inner stiffness of the bilinear spring is equal to zero, i.e. freeplay stiffness. It is shown that the Piecewise Linear analysis fails to capture the bifurcation behaviour for this case, while the Harmonic Balance method still produces some accurate predictions. [less ▲]

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See detailEffect of ovariectomy and ad libitum feeding on body composition, ghrelin and leptin plasma concentrations
Jeusette, Isabelle; Nguyen, Patrick; Lhoest, Estelle et al

in Proceedings of the 8th ESVCN International Conference (2004, September)

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See detailPractical case of HACCP methodology used for Staphylococcus aureus groth control in raw milk "fromage frais".
Broze, Olivier; Defrize, Nathalie; Sindic, Marianne ULg et al

in Proceedings of the Ninth conference on food microbiology (2004, September)

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See detailDilatometric Investigations on the Decomposition of Austenite in Two Medium-Carbon Steels With and Without Cr and Mo Additions
Mertens, Anne ULg; Brown, Andrew J.; Zhao, Lie et al

in Proceedings of the MS&T'04 Conference (2004, September)

The interest of small additions of Cr (< 3 wt %) and Mo (~ 0.2 wt %) in steels for automotive and bearing applications has been recently highlighted. The microstructure of these steels is primarily based ... [more ▼]

The interest of small additions of Cr (< 3 wt %) and Mo (~ 0.2 wt %) in steels for automotive and bearing applications has been recently highlighted. The microstructure of these steels is primarily based on the bainitic phase. In order to optimize their microstructure and their mechanical properties, it is, therefore, of primary importance to gain a better understanding of the influence of Cr and Mo on austenite decomposition in varying temperature regimes with a particular attention to the transition between ferrite, bainite and martensite formation. In the present work, dilatometry, combined with detailed microstructural characterisation, is used in order to obtain a full view of transformation processes and kinetics in two medium-carbon steels with and without Cr and Mo additions. [less ▲]

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See detailA guidance assistance method for precision sugar beet sowing using machine vision.
Leemans, Vincent ULg; Destain, Marie-France ULg

in Pr. Josse De Baerdemaeker (Ed.) AgEng 2004 Conference - Engineering the future - Book of abstracts (2004, September)

This paper presents a method for seed drill guidance by using machine vision

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See detailNutritional evaluation and support in the surgery unit : retrospective study at the veterinary school of Liège.
Lhoest, Estelle; Jeusette, Isabelle; Claeys, Stéphanie ULg et al

in Hurley, Karyl (Ed.) Proceedings of the 14th ECVIM-CA Congress (2004, September)

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See detailDynamique d'une population de martins pêcheurs (Alcedo atthis) en Belgique en liaison avec la gestion des cours d'eau.
Libois, Roland ULg

in Actes du 1er colloque international "gestion et préservation des ressoures en eau" (2004, September)

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See detailEcologie de la loutre (Lutra lutra) et conservation de ses habitats riverains
Libois, Roland ULg

in Actes du 1er colloque international "gestion et préservation des ressoures en eau" (2004, September)

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See detailModelling groundwater flow and solute transport in karstic systems: from dreams to the reality – how can models help for groundwater vulnerability assessment ?
Dassargues, Alain ULg

in Proceedings of Trans-Karst 2004, International Transdisciplinary Conference on Development and Conservation of Karst Regions (2004, September)

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See detailPd-Ag/SiO2 and Pd-Cu/SiO2 cogelled xerogel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene
Lambert, Stéphanie ULg; Ferauche, Fabrice; Brasseur, Alain et al

in CD-ROM of full texts of the 16th International Congress of Chemical and Process Engineering, CHISA (Paper A7.2, 11 p.) (2004, August 22)

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See detailFocii determination of an off axis ellipsoid : Theory to practice
Houbrechts, Yvette ULg; Roose, Stéphane ULg; Stockman, Yvan ULg

in Osten, W.; Novak, E. (Eds.) Proceedings of the Eighth International Conference on Laser and Laser Information Technologies (2004, August 02)

In the frame of cryogenic test on an off axis ellipsoid, it has been required to set-up an unambiguous method to determine and track the foci position during temperature transitions. This procedure was ... [more ▼]

In the frame of cryogenic test on an off axis ellipsoid, it has been required to set-up an unambiguous method to determine and track the foci position during temperature transitions. This procedure was mandatory to avoid: (1) impact of the operator skills working on triple shift scheme to assure continuously monitoring of the ellipsoid shape during cool down. (2) correctly dissociate the impact of the thermal deformation on the mirror shape with respect to alignment errors. This paper will demonstrate the process, starting from ideal ellipsoid shape, then introducing 3D metrology data in a model, and finally presents the results in a practical situation. [less ▲]

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See detailGetDP/Gmsh: Benefits and Pitfalls of an Open Software Environment
Geuzaine, Christophe ULg

in Kettunen, L. (Ed.) Proceedings of the Advanced Computational Electromagnetism workshop, Seminar on Modern Software Design (2004, August 02)

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See detailWhat can the S [B9] database do for you?
Pourbaix, D.; Jancart, Sylvie ULg; Boffin, H. M. J.

in Allen; Scarfe (Eds.) The environments and evolution of double and multiple stars (2004, August 01)

This paper illustrates different kinds of problems that can be tackled with S [B[SUP]9[/SUP]], the 9th catalogue of spectroscopic binary orbits.

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See detailShort-circuit mechanical effects on outdoor HV substations with wide bundling.
Pitz, Volker; Köster, Hans-Joachim; Stein, Norbert et al

in Conférence Internationale des grands réseaux électriques à haute tension - CIGRE (2004, August)

This paper presents results of a research project investigating the mechanical effects of short-circuit currents in high-voltage substations with conductor bundles. The experimental part was performed on ... [more ▼]

This paper presents results of a research project investigating the mechanical effects of short-circuit currents in high-voltage substations with conductor bundles. The experimental part was performed on two set-ups, called "100 kV arrangement" and "400 kV arrangement". Those two set-ups differed in the height of the crossarm, the phase-to-phase distance and the conductor sag. Additional parameters which were varied in the course of the experiments included the level and duration of the short-circuit current, the type and number of the spacers used and the bundle spacing. Various forces in the flexible busbar and the supporting structure were recorded during the tests and the stiffness as well as the eigenfrequency of the portals used for supporting the conductors were determined. The test results were evaluated with respect to the maxima of the pinch force, the tensile force and the drop force. They are presented and compared with existing assumptions and calculation methods. The results of this project shall enable IEC standardization committees and CIGRE working groups to carry on with their intended studies and establish a comprehensive method of calculating the mechanical effects in substations with bundle conductors. [less ▲]

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See detailImprovement of students’ motivation in a pe class. An action-research project
Cloes, Marc ULg; Viseur, C.; Motter, Pascale

in Klissouras, V.; Kellis, S.; Mouratidis, I. (Eds.) Proceedings of the 2004 Pre-Olympic Congress. Sport Science through the Ages. (2004, August)

Adolescents' motivation is a major concern of PE teachers. Many students, especially girls, are characterized by unmotivated behaviours in the gym. For two decades, quantitative research has been ... [more ▼]

Adolescents' motivation is a major concern of PE teachers. Many students, especially girls, are characterized by unmotivated behaviours in the gym. For two decades, quantitative research has been conducted to better understand the problem. More recently, some qualitative studies have been proposed. ... [less ▲]

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See detailPork quality as related to halothane genotype and slaughter conditions in a belgian study
Leroy, Bernadette ULg; Beduin, Jean-Marie; Etienne, Grégory et al

in Proceedings of the 50th International Congress of Meat Science and Technology (2004, August)

The objectives of this study were to evaluate technological and organoleptic properties of pork meat representative of different Belgian production systems and to determine the contribution of significant ... [more ▼]

The objectives of this study were to evaluate technological and organoleptic properties of pork meat representative of different Belgian production systems and to determine the contribution of significant factors to meat quality variability, in particular the halothane genotype, fasting time, lairage time and slaughtering plant. A total of 521 pigs were used in five Belgian commercial slaughtering plants over a 1 ½ year period. 79% of pigs belonged to four different quality production systems. The remaining 21% were randomly sampled in standard production. The lairage time (LT) was measured at slaughter. In the slaughterline, the entire intestinal tractus (OW) and the carcass (HCW) were weighed, the pH1 and electrical conductivity (PQM1) were measured 45 min post mortem in the longissimus dorsi muscle. One 2.5 cm thick cut of this muscle was removed 24h post mortem for further measurements in the lab : ultimate pH (pHu), ultimate electrical conductivity (PQMu), color (CIE L*a*b*), drip loss (DL), cooking loss (CL) and tenderness (WBPSF). The halothane genotype (CC, CT and TT for homozygote negative, heterozygote negative and homozygote positive for the RYR1 gene mutation respectively). The data were analyzed using SAS and the General Linear Model (GLM) SAS procedure was used in order to estimate the influence of halothane genotype, LT and slaughterhouse on the variability of pH1, PQM1, pHu, PQMu, drip loss, cooking loss, CIE Lab and WBPSF. The relative weight of OW on HCW was included in the models as covariate and used as inverse indicator of the fasting time. Least Squares Means (LSM) were computed for significant effect in the models and compared pairwise by the Student’s t-test. A large variation was observed for the meat quality parameters, in particular for pH1 (from 5.30 to 6.85), DL (from 1.2 to 11.4%) and CIE L* (from 41.6 to 66.4%). The lowest values for pH1 and highest values for DL or CIE L* indicated the presence of pale, soft, exudative meat. For all parameters –except for the pHu, CL and WBPSF– a moderate to great part of variation was explained by the GLM models (R² = 0.22-0.56). The halothane genotype effect was highly significant (p<0.001) on most meat quality traits : pH1, PQM1, PQMu and color parameters (CIE Lab) but not significant on pHu and CL. The LT had a highly significant influence only on PQMu, CIE b and DL. There was a highly significant effect (p<0.01) of the slaughtering plant on pH1, PQM1, PQMu and color parameters (CIE Lab) and a significant influence (p<0.01) on the variability of DL and CL. By contrast, the fasting time had no effect on most meat quality parameters except on DL (p<0.01) and CL (p<0.001). As indicated by the regression coefficient, an increase of OW/hot HCW seems to be related to an increase of DL (p<0.01) or CL (p<0.001). From the halothane genotype Least Squares Means and their standard errors, it appeared that meat quality was negatively affected by the presence of the RYR1 mutation. DL differed significantly (p<0.05) between genotypes with the TT pigs having the highest DL (6.8%) while that of the CC (5.5%) was the lowest and that of CT intermediate (6.1%). CL was also significantly higher (p<0.05) in TT pigs indicating lower water holding capacity. Significant differences between CC and TT genotypes (p< 0.05) were observed in terms of pH1 (6.12 vs 5.69), PQM1 (4.9 vs 6.4) and PQMu (9.7 vs 12.7). The CIE L and b values (56.9% and 16.6) were significantly higher (p<0.05) in the TT group comparatively to CC (55.0% and 15.8%) or CT pigs (54.6% and 15.4). The higher L value of the TT genotypes indicated paler meat. The WBPSF was the lowest for CT pigs with no significant difference observed between the CC and TT genotypes. A significant effect (p<0.05) of the abattoir was observed for all meat quality parameters. Although it would be necessary to determine the reasons for abattoirs differences, the small and old structure of one of the abattoirs and the lack of training of the staff could partially explain the results. Further research is needed to evaluate the interaction terms and to identify slaughtering factors which could explain slaughterhouse differences in terms of meat quality. [less ▲]

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See detailOrganisation of « sport + studies programmes » at secondary school level: the perceptions of the students and the staff
Cloes, Marc ULg

in Klissouras, V.; Kellis, S.; Mouratidis, I. (Eds.) Proceedings of the 2004 Pre-Olympic Congress. Sport Science through the Ages. (2004, August)

It is undeniable that sporting success requires an intensive practice, increasingly early and strictly supervised. This necessarily implies that the young athltes find a balance btween the sporting and ... [more ▼]

It is undeniable that sporting success requires an intensive practice, increasingly early and strictly supervised. This necessarily implies that the young athltes find a balance btween the sporting and school education. All around the world, seceral organisations were proposed in order to facilitate the task of the sporting hopes and to enable them to encure their future life as well as possible. [less ▲]

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See detailA systematic model reduction method for the control of flexible multibody systems
Bruls, Olivier ULg; Duysinx, Pierre ULg; Golinval, Jean-Claude ULg

in Proc. of the 21st Int. Congress of Theoretical and Applied Mechanics (ICTAM) (2004, August)

This paper presents a method to build closed-form dynamic equations for flexible multibody systems with a minimal kinematic description. Relying on the Finite Element formalism, the method is able to ... [more ▼]

This paper presents a method to build closed-form dynamic equations for flexible multibody systems with a minimal kinematic description. Relying on the Finite Element formalism, the method is able to tackle complex topologies with closed-loops in a systematic way. Thus, it will be of great use in the framework of model based control of flexible mechanisms. The reduction procedure is based on an interpolation strategy: a Finite Element model is built and reduced for a number of selected points in the configuration space, and then, a piecewise polynomial model is adjusted to match the collected data. A few applications of the reduction method are considered: a serial pick-and-place machine, a flexible four bar mechanism, and a parallel kinematic manipulator. [less ▲]

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See detailFirst Ground-Based Validation of SCIAMACHY V5.01 Ozone Column
Lambert, Jean-Christopher; Allaart, M; Andersen, S.B. et al

in Proceedings of the Second Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-2), ESA-ESRIN, Frascati, Italy, 3-7 May 2004 (ESA SP-562, August 2004) ESC01JL1 (2004, August)

In early 2004, the near real-time data processor of ENVISAT SCIAMACHY (SCI_NL) was upgraded to version 5.01. Based on the correlative measurements acquired and collected during the commissioning phase of ... [more ▼]

In early 2004, the near real-time data processor of ENVISAT SCIAMACHY (SCI_NL) was upgraded to version 5.01. Based on the correlative measurements acquired and collected during the commissioning phase of the satellite in 2002, a preliminary validation was organised to verify the improvement and assess the geophysical consistency of the new SCIAMACHY ozone vertical column data product. The present overview summarises the results obtained by a list of validation teams and involving ground-based data acquired from pole to pole by complementary ground-based sensors. The studies conclude to an improvement compared to previous versions 3.5x. They also confirm the presence of expected errors (e.g. dependence on solar elevation and on ozone column) inherited from the GOME Data Processor GDP 2.4, on which the SCIAMACHY processor SCI_NL is based. [less ▲]

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See detailGeneration of closed-form models for the control of flexible mechanisms: a numerical approach
Bruls, Olivier ULg; Duysinx, Pierre ULg; Golinval, Jean-Claude ULg

in Proc. of the 7th Int. Conf. on Motion and Vibration Control (MOVIC) (2004, August)

In robotics, most high performances control strategies require a closed-form representation of the mechanical dynamic behaviour. This is even more critical when significant flexible effects are to be ... [more ▼]

In robotics, most high performances control strategies require a closed-form representation of the mechanical dynamic behaviour. This is even more critical when significant flexible effects are to be considered in the control algorithm. This paper presents a method to build closed-form dynamic equations for flexible multibody systems in terms of minimal coordinates. Relying on the Finite Element (FE) formulation, the method is able to tackle complex topologies with closed-loops in a systematic way. The method is based on an interpolation strategy. For a number of selected points in the configuration space, a full Finite Element model is built and reduced according to a component mode synthesis. Then, a piecewise polynomial model is adjusted to match the collected data. In order to guarantee the continuity of the model, a mode tracking strategy is implemented. After the presentation of the reduction procedure and of the interpolation strategy, a four-bar mechanism is analyzed as an illustrative example. [less ▲]

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See detailAssessment of the Electric and Magnetic field levels in the vicinity of the HV overhead power lines in Belgium.
Hoeffelman, Jean; Decat, Gilbert; Lilien, Jean-Louis ULg et al

in Conférence Internationale des Grands Réseaux Electriques à Haute Tension - CIGRE (2004, August)

Maximum exposure levels in the vicinity of HV power lines in Belgium.

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See detailLimiting windstorm effects on tower by the « low drag » cable
Lilien, Jean-Louis ULg; Snegovski, Dmitri; Capelle, Thierry et al

(2004, August)

Hurricane winds affect the flow around electrical conductor in a way that it may reach the critical (Drag crisis) and postcritical states. It is thus important to introduce the cable aerodynamic drag as ... [more ▼]

Hurricane winds affect the flow around electrical conductor in a way that it may reach the critical (Drag crisis) and postcritical states. It is thus important to introduce the cable aerodynamic drag as Reynolds-dependent when calculating the response of the power transmission line under hurricane. To represent the respective wind loading on cable, the turbulent, spatially non-uniform wind model is used. In order to assess the behaviour and cyclic fatigue loads under hurricane conditions of different transmission line conductors, the time response analyses were done. Results of comparative study of the smooth cable AERO-Z and classical multistrand cable, including the percentage of load reduction offered to supporting structure, are presented. [less ▲]

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See detailGeophysical Validation of SCIAMACHY NO2 Vertical Columns: Overview of Early 2004 Results
Lambert, Jean-Christopher; Blumenstock, Thomas; Boersma, F. et al

in Proceedings of the Second Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-2), ESA-ESRIN, Frascati, Italy, 3-7 May 2004 (ESA SP-562, August 2004) ESC01JL1 (2004, August)

Following the recommendations drawn after the Commissioning Phase of the ENVISAT satellite in 2002, SCIAMACHY near real time data processors were upgraded to version 5.01 in early 2004. Before public ... [more ▼]

Following the recommendations drawn after the Commissioning Phase of the ENVISAT satellite in 2002, SCIAMACHY near real time data processors were upgraded to version 5.01 in early 2004. Before public release of the new SCIAMACHY nitrogen dioxide (NO2) vertical column data product, several validation teams investigated its improvement and assessed its geophysical consistency by means of correlative studies involving NDSC-affiliated ground-based networks of DOAS UV-visible and FTIR spectrometers and the ERS-2 GOME satellite. In parallel, preliminary SCIAMACHY NO2 column data products generated by research processors under development at scientific institutes were also tested, using the same correlative data and validation procedures. Digesting the results obtained by a list of validation teams and SCIAMACHY data processing teams, this overview paper draws a preliminary quality assessment of the SCIAMACHY NO2 column data sets available in spring 2004. [less ▲]

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See detailA heat piloted residential 5 kW fuel cell
Lilien, Jean-Louis ULg; Maréchal, François; Lerson, Sébastien et al

(2004, August)

based on residential house demand (electrical, heating, domestic hot water), the optimisation of the use of a SOFC fuel cell of about 5 kWe is detailed to reduce CO2 emission at their minimum.

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See detailAnalysis of the volleyball spike: relationships between several parameters and the speed of the ball
Cloes, Marc ULg; Croisier, Jean-Louis ULg; Barsin, M. et al

in Proceedings of the 2004 Pre-Olympic Congress Sport Science through the Ages (2004, August)

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See detailContribution to the design of sway composite frames
Maquoi, René ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Leon, Roberto; Lange, Jörg (Eds.) Composite Construction in Steel and Concrete V (2004, July 18)

This paper presents numerical and analytical studies carried out at Liège University, as part of a European research project, with the objective to investigate the in-plane behaviour of composite sway ... [more ▼]

This paper presents numerical and analytical studies carried out at Liège University, as part of a European research project, with the objective to investigate the in-plane behaviour of composite sway frames under static loading. [less ▲]

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See detailEpidemiology of lesions in high-level competition judo
Zinzen, E.; Vanbergen, Johanne; Clarijs, Jan Pieter et al

in Abstract Book of the 9th Annual Congress of the European College of Sports Science (2004, July)

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See detailUsing higher order sigma delta modulators as interface for closed loop micromachined sensors
Kraft, Michaël ULg; Dong, Yufeng; Redman-White, William

in The 5th IEE International Conference on Advanced A-D and D-A Conversion Techniques and Their Applications (2004, July)

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See detailDISSIPATIVITY AND GLOBAL ANALYSIS OF LIMIT CYCLES IN NETWORKS OF OSCILLATORS
Stan, Guy-Bart; Sepulchre, Rodolphe ULg

in Proceedings of the 16th Symposium on Mathematical Theory of Networks and Systems (2004, July)

This paper is concerned with the global analysis of synchrone oscillations in special networks of oscillators. In previous work, we de ned a class of highdimensional, parameter-dependent nonlinear systems ... [more ▼]

This paper is concerned with the global analysis of synchrone oscillations in special networks of oscillators. In previous work, we de ned a class of highdimensional, parameter-dependent nonlinear systems exhibiting almost globally asymptotically stable limit cycle oscillations. In this paper, we show how (incremental) dissipativity may be used to extend the global analysis of limit cycle oscillations to networks of coupled identical systems. [less ▲]

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See detailWake-Induced Vibration in Power Transmission Line. Parametric study
Lilien, Jean-Louis ULg; Snegovski, Dmitri

in Flow Induced Vibration - FIV 2004 (2004, July)

The paper discusses some aspects of modeling the wake-induced vibrations of the bundle conductors in transmission lines. The wake coupling between subconductors is modeled with the modified Simpson’s ... [more ▼]

The paper discusses some aspects of modeling the wake-induced vibrations of the bundle conductors in transmission lines. The wake coupling between subconductors is modeled with the modified Simpson’s approach. In order to apply this model to the analysis of power transmission line (PTL), a modal representation of a span could be used. In present paper we study how application of Dynamic Reduction (Component Mode) technique may improve such analysis under finite-element approach. The present paper, to extent of authors’ knowledge, is the first where Component Mode method application is discussed to study the subspan oscillation. Finally, bundled conductors’ susceptibility to wake-induced vibrations is illustrated on an exemplary twin-bundle, three-subspan model. Effects of bundle parameters (initial subconductor spacing, frequency ratio, subconductor mass), and the means to account them when applying the component mode method are discussed. [less ▲]

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See detailUse of autogenous fascia lata graft for perineal herniorrhaphy in dogs: a preliminary study
Bongartz, Alexandre; Carofiglio, Francesca; Heimann, Marianne et al

in Proceedings du 13th Annual Scientific Meeting ECVS (2004, July)

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See detailSystem optimization for residential SOFC 5 kW heat and electricity management
Lilien, Jean-Louis ULg; Lerson, Sébastien; Pochet, Nicolas

(2004, July)

A demonstration project will be presented using a 5 kW Solid Oxyde Fuel Cell for residential application in the region of Liège, Belgium. The current stage of the project is to evaluate the thermal ... [more ▼]

A demonstration project will be presented using a 5 kW Solid Oxyde Fuel Cell for residential application in the region of Liège, Belgium. The current stage of the project is to evaluate the thermal management of a single house with, at the present time, 45 MW.h (thermal 25 MW.h, electrical 20 MW.h) annual consumptions. The changes needed from a classical gas boiler heating of 20 kW to a 6 kW (thermal) plus 5 kW (electrical) system will be studied and detailed. Evaluation of CO2 reduction in the two systems will be presented considering the Belgium mix of electricity production. The heat and electricity local storage to cover peak demand in both energy demands will be discussed in relation with a grid-connected fuel cell. In particular the detailed analysis of this home demand will be analysed for the last three years. An original thermal circuit will be proposed, including its regulation. The experimental result of the behaviour of our proposal during 2003-2004 winter will be presented using a “virtual” SOFC (actually replaced by “equivalent” 6 kWth boiler) which is intended to be used in the same environment after this testing period. Constrains related to SOFC typical behaviour will be taken into account in our proposal for regulation. Depending on our development, it may be possible that up-to-date results may be given at the conference with a real system using a true SOFC 5 kW which would be in service after Septembre 2004. [less ▲]

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See detailNonlinear System Identification using Interpolated Short Time Fourier Transform
Shi, Dongfeng; Dimitriadis, Grigorios ULg

in Akay, A.; Arnas, O.; Cooper, J. E. (Eds.) et al Proceedings of 7th Biennial ASME Conference on Engineering Systems Design and Analysis (2004, July)

For the purpose of constructing the backbone of nonlinear systems, the Interpolated Short Time Fourier Transform (ISTFT) is proposed as a means to improve the estimation accuracy of the instantaneous ... [more ▼]

For the purpose of constructing the backbone of nonlinear systems, the Interpolated Short Time Fourier Transform (ISTFT) is proposed as a means to improve the estimation accuracy of the instantaneous amplitudes and frequencies of response signals. It is shown that the backbone curves estimated by the ISTFT agree with theoretical backbone curves very well. Additionally, the restoring force can be reconstructed to specify the type of nonlinear stiffness. A curve-fitting technique is introduced to estimate the parameters of nonlinear systems on the basis of theoretical backbone curves. It is shown that a number of typical nonlinear stiffness functions such as cubic, bilinear and pre-compressed springs can be identified accurately using this new method. [less ▲]

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See detailSubspace Monitoring of Multivariate Dynamic Systems
Kruger, Uwe; Treasure, Richard; Dimitriadis, Grigorios ULg

in Akay, A.; Arnas, O.; Cooper, J. E. (Eds.) et al Proceedings of 7th Biennial ASME Conference on Engineering Systems Design and Analysis (2004, July)

In this article, the monitoring of continuous processes using linear dynamic models is presented. It is outlined that dynamic extensions to conventional multivariate statistical process control (MSPC ... [more ▼]

In this article, the monitoring of continuous processes using linear dynamic models is presented. It is outlined that dynamic extensions to conventional multivariate statistical process control (MSPC) models may lead to the inclusion of large numbers of variables in the condition monitor. To prevent this, a new dynamic monitoring scheme, based on subspace identification, is introduced, which can (i) determine a set of state variable for describing process dynamics and (ii) produce a reduced set of variables to monitor process performance. This is demonstrated by an application study to a realistic simulation of a chemical process. [less ▲]

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See detailIdentification and model Updating of a non-stationary vibrating system
Dimitriadis, Grigorios ULg; Fassois, Spilios; Poulimenos, Aggelos et al

in Akay, A.; Arnas, O.; Cooper, J. E. (Eds.) et al Proceedings of 7th Biennial ASME Conference on Engineering Systems Design and Analysis (2004, July)

Non-stationary systems, which are commonly encountered in many fields of science, are characterized by time-varying features and require time-frequency methods for their analysis. This study considers the ... [more ▼]

Non-stationary systems, which are commonly encountered in many fields of science, are characterized by time-varying features and require time-frequency methods for their analysis. This study considers the problem of identification and model updating of a non-stationary vibrating system. In particular, a number of identification methods and a model updating procedure are evaluated and compared through application to a time-varying “bridge-like” laboratory structure. The identification approaches include Frequency Response Function based parameter estimation techniques, Subspace Identification and Functional Series modelling. All methods are applied to both output-only and input-out-put data. Model updating is based upon a theoretical model of the structure obtained using a Rayleigh-Ritz methodology, which is updated to account for time-dependence and nonlinearity via the identification results. Interesting comparisons, among both identification and model updating results, are performed. The results of the study demonstrate high modelling accuracy, illustrating the effectiveness of model updating techniques in non-stationary vibration modelling. [less ▲]

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See detailMultiple Frequency Analysis Methods for Blade Tip-Timing Data Analysis
Gallego-Garrido, Jon; Dimitriadis, Grigorios ULg

in Akay, A.; Arnas, O.; Cooper, J. E. (Eds.) et al Proceedings of 7th Biennial ASME Conference on Engineering Systems Design and Analysis (2004, July)

Blade Tip-Timing (BTT) is a method for the measurement of blade vibration in rotating bladed assemblies such as those found in turbomachinery. The system aims to replace strain gauge technology. However ... [more ▼]

Blade Tip-Timing (BTT) is a method for the measurement of blade vibration in rotating bladed assemblies such as those found in turbomachinery. The system aims to replace strain gauge technology. However all current BTT analysis methods fail to recover the correct frequencies when two blade modes are excited simultaneously by a synchronous vibration. In this paper, five new methods that can recover simultaneous frequencies from BTT data are presented. The methods are based on the auto-regressive approach. The approaches make use of data either from a single blade and single revolution or from multiple revolutions. Furthermore, some of the methods are designed to allow for the presence of measurement errors. The techniques are validated on three test cases in which simulated data was used. It is shown that most of the methods produce accurate estimates for the vibration frequency, even in the presence of significant noise levels, provided that a suitable amount of the response waveform is measured. The most consistent estimates are obtained from the methods that make use of data from multiple revolutions. [less ▲]

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See detail3D simulation of Industrial Hall in case of fire. Benchmark between ABAQUS, ANSYS and SAFIR
Vassart, Olivier; Cajot, Louis-Guy; O'Connor, Marc et al

in Interflam2004 Proceedings. Fire Sciences and Engineering Conference (2004, July)

For simple storey buildings, the structural behaviour in case of fire is relevant only for the safety of the firemen. The protection of occupants and goods is a matter of fire spread, smoke propagation ... [more ▼]

For simple storey buildings, the structural behaviour in case of fire is relevant only for the safety of the firemen. The protection of occupants and goods is a matter of fire spread, smoke propagation, active fire fighting measures and evacuation facilities. Brittle failure, progressive collapse and partial failure of façades elements outwards may endanger the fire fighters and have to be avoided. In order to deal with such an objective, the simulation softwares has to cover the 3D structural behaviour including membrane and restrained effects as well as the failure mode so that post-local failure stage can be analysed. Such calculation models (ANSYS, ABAQUS and SAFIR [1]) have been compared true a benchmark. In this benchmark, two different users used ABAQUS. [less ▲]

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See detailL'attachement et ses difficultés: repérages et compréhension
Battisti, Oreste ULg

in Bertrand, Jean Marie (Ed.) Troisième journée interactive du CHVE-CHC (2004, June 19)

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See detailExperimental and analytical investigations on single-sided composite joint configuration
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Walraven, Joost; Blaauwendraad, Johan; Scarpas, Tom (Eds.) et al 5th International PhD Symposium in Civil Engineering (2004, June 16)

For three years, in the framework of a European research project funded by the European Community for Steel and Coal (ECSC) in which the Liège University was deeply involved, intensive experimental ... [more ▼]

For three years, in the framework of a European research project funded by the European Community for Steel and Coal (ECSC) in which the Liège University was deeply involved, intensive experimental, numerical and theoretical investigations have been carried out on the behaviour of composite sway buildings under static and seismic loading. This paper presents experimental and analytical studies carried out at Liège University, as part of the above European project, with the objective to investigate the behaviour of a single-sided composite joint configuration under static loading. A particular failure mode occurred during the experimental tests, which had not yet been detected previously; it is described in details. Then, an analytical formula covering this particular phenomenon and based on a theoretical model is presented; it is validated through comparisons with experimental results. [less ▲]

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See detailObesity resulted in a significant increase in blood lipids in dogs
Jeusette, Isabelle; Lhoest, Estelle; Istasse, Louis et al

in Proceedings of the AAVN Clinical Nutrition and Research Symposium (2004, June 09)

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See detailSWAP: Sun watcher with a new EUV telescope on a technology demonstration platform
Defise, Jean-Marc ULg; Lecat, Jean-Hervé ULg; Mazy, Emmanuel ULg et al

in 5th International Conference on Space Optics (2004, June 01)

SWAP (SWAP (Sun Watcher using Active Pixel System detector and Image Processing) is an instrument that has been selected to fly on the PROBA-2 technology demonstration platform, a program of the European ... [more ▼]

SWAP (SWAP (Sun Watcher using Active Pixel System detector and Image Processing) is an instrument that has been selected to fly on the PROBA-2 technology demonstration platform, a program of the European Space Agency (ESA) to be launched in 2006. SWAP is based on an off-axis degraded Ritchey Chretien telescope that will image the EUV solar corona at 19.5 nm on a specifically fabricated extreme ultraviolet (EUV) sensitivity enhanced CMOS APS detector. The optical design and the optical coatings are derived from the Extreme Ultraviolet Imaging Telescope (EIT) operating on-board SOHO since 1995. It has been adapted for a single wavelength telescope with off-axis optics. It allows to use smaller optics and filters, with simple internal baffles avoiding external protruding parts. The superpolished optics will receive a multilayer coating that provides spectral selection centred on 19.5 nm and EUV reflectivity in normal incidence. This compact design is specifically adapted for accommodation on PROBA-2, where mass and envelope requirements are very stringent The SWAP PROBA-2 program will be an opportunity to demonstrate this new optical concept, while it will also validate space remote sensing with APS detectors, as well as on-board image processing capabilities. On the science outcomes, SWAP will provide solar corona images in the Fe XII line on a baselined 2-min cadence. Observations with this specific wavelength allow detecting phenomena, such as solar flares or 'EIT-waves', associated with the early phase of coronal mass ejections. The SWAP data will complement the observations provided by SOHO-EIT, and STEREO-SECCHI. [less ▲]

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See detailAn MHD-driven Disk Wind Outflow in SDSS J0300+0048?
Hall, Patrick; Hutsemekers, Damien ULg

in AGN Physics with the Sloan Digital Sky Survey. ASPC 311 (2004, June 01)

The outflow in SDSS J0300+0048 has the highest column density yet reported for a broad absorption line quasar. The absorption from different ions is also segregated as a function of velocity in a way that ... [more ▼]

The outflow in SDSS J0300+0048 has the highest column density yet reported for a broad absorption line quasar. The absorption from different ions is also segregated as a function of velocity in a way that can only be explained by a disk wind outflow. Furthermore, the presence of the such large column densities of gas at the high observed outflow velocities may be incompatible with purely radiative acceleration. MHD contributions to the acceleration should be considered seriously. [less ▲]

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See detailA Search for Rotationally Modulated Halpha Variability in OB Supergiants
Morel, Thierry ULg; Marchenko, S. V.; Pati, A. K. et al

in Stellar Rotation (2004, June 01)

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See detailDevelopment of optical ground verification method for mum to sub-mm reflectors
Stockman, Yvan ULg; Thizy, Cédric ULg; Lemaire, Philippe ULg et al

in 5th International Conference on Space Optics (2004, June 01)

Large reflectors and antennas for the IR to mm wavelength range are being planned for many Earth observation and astronomical space missions and for commercial communication satellites as well. Scientific ... [more ▼]

Large reflectors and antennas for the IR to mm wavelength range are being planned for many Earth observation and astronomical space missions and for commercial communication satellites as well. Scientific observatories require large telescopes with precisely shaped reflectors for collecting the electro-magnetic radiation from faint sources. The challenging tasks of on-ground testing are to achieve the required accuracy in the measurement of the reflector shapes and antenna structures and to verify their performance under simulated space conditions (vacuum, low temperatures). Due to the specific surface characteristics of reflectors operating in these spectral regions, standard optical metrology methods employed in the visible spectrum do not provide useful measurement results. The current state-of-the-art commercial metrology systems are not able to measure these types of reflectors because they have to face the measurement of shape and waviness over relatively large areas with a large deformation dynamic range and encompassing a wide range of spatial frequencies. 3-D metrology (tactile coordinate measurement) machines are generally used during the manufacturing process. Unfortunately, these instruments cannot be used in the operational environmental conditions of the reflector. The application of standard visible wavelength interferometric methods is very limited or impossible due to the large relative surface roughnesses involved. A small number of infrared interferometers have been commercially developed over the last 10 years but their applications have also been limited due to poor dynamic range and the restricted spatial resolution of their detectors. These restrictions affect also the surface error slopes that can be captured and makes their application to surfaces manufactured using CRFP honeycomb technologies rather difficult or impossible. It has therefore been considered essential, from the viewpoint of supporting future ESA exploration missions, to develop and realise suitable verification tools based on infrared interferometry and other optical techniques for testing large reflector structures, telescope configurations and their performances under simulated space conditions. The first one is an IR-phase shifting interferometer with high spatial resolution. This interferometer shall be used specifically for the verification of high precision IR, FIR and sub-mm reflector surfaces and telescopes under both ambient and thermal vacuum conditions. The second one presented hereafter is a holographic method for relative shape measurement. The holographic solution proposed makes use of a home built vacuum compatible holographic camera that allows displacement measurements from typically 20 nanometres to 25 microns in one shot. An iterative process allows the measurement of a total of up to several mm of deformation. Uniquely the system is designed to measure both specular and diffuse surfaces. [less ▲]

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See detailUndervoltage load shedding scheme for the Hydro-Québec system
Lefebvre, Daniel; Bernard, Serge; Van Cutsem, Thierry ULg

(2004, June)

In recent years, Hydro-Québec has undertaken a major program to upgrade the reliability of its transmission system. Much effort has been focused on increasing the system's ability to withstand extreme ... [more ▼]

In recent years, Hydro-Québec has undertaken a major program to upgrade the reliability of its transmission system. Much effort has been focused on increasing the system's ability to withstand extreme contingencies, usually caused by multiple incidents or the successive tripping of transmission lines. This paper deals with the conception and the control logic of an undervoltage load shedding scheme aimed at protecting the Hydro-Québec system against long-term voltage instability. Various results showing the impact of the operation of these automatisms on the system stability are provided in this paper. [less ▲]

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See detailPreventive use of bronchodilators reduces bronchoscopy-induced airflow limitation in cats
Kirschvink, N.; Leemans, J.; Delvaux, F. et al

in ACVIM Meeting - Minneapolis - USA - Juin 2004 (2004, June)

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See detailMaîtrise des bonnes pratiques d'hygiène.
Sindic, Marianne ULg

in Proceedings 4ème Congrès National d'hygiène alimentaire et de nutrition humaine. (2004, June)

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See detailModélisation des effets chimiques dans les argiles partiellement saturées.
Boukpeti, N.; Liu, Z.; Charlier, Robert ULg

in Journées Nationales de Géotechnique et de Géologie de l'Ingénieur (2004, June)

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See detailA Microstructural Study of Doped-LaGaO3 (La0.9Sr0.1Ga0.8Mg0.2O2.85) Produced by an Autocombustion from a Gel-like Precursor
Traina, Karl ULg; Pirard, Jean-Paul; Rulmont, André ULg et al

in Bossel, Ulf (Ed.) Sixth European Solid Oxide Fuel Cell Forum - Proceedings (2004, June)

Polycrystalline dense samples of lanthanum gallate doped with strontium and magnesium (La0.9Sr0.1Ga0.8Mg0.2O2.85 or LSGM) was prepared using a novel gel precursor synthesis method. This consists in ... [more ▼]

Polycrystalline dense samples of lanthanum gallate doped with strontium and magnesium (La0.9Sr0.1Ga0.8Mg0.2O2.85 or LSGM) was prepared using a novel gel precursor synthesis method. This consists in preparing a LSGM precursor from a freeze-dried Agar-Agar gel. After the freeze-drying step, the dry residue is put in an oven at 120°C where autocombustion occurred. The as-produced powders are then calcined. Investigations are made to follow both structural and microstructural evolutions from the dry residue to the end product. The effect of the temperature evolution was examined by thermogravimetric analysis, X-ray diffraction, environmental scanning electron microscopy, and specific surface area analysis. Dilatometric curves and density measurements have been also performed on the sintered products. Advantages of this method are the ability to control size distribution and to obtain high density materials without any milling step thus avoiding any contamination coming from the grinding medium. [less ▲]

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See detailCombining classification techniques with Kalman filters for aircraft engine diagnostics
Dewallef, Pierre ULg; Léonard, Olivier ULg; Mathioudakis, Kostas et al

in Proceedings of the ASME Turbo Expo 2004 (2004, June)

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See detailAdvances in pulsed holographic interferometry with photorefractive crystals
Georges, Marc ULg; Pauliat, B.; Alexeenko, I. et al

in Tomasini, E. (Ed.) 6th Intl Conf on Vibration Measurements by Laser Techniques : Advances and Applications (2004, June)

Photorefractive crystals offer many advantages over other classical holographic recording media. They allow fast in-situ processable holographic recording as well as indefinite reusability. Moreover high ... [more ▼]

Photorefractive crystals offer many advantages over other classical holographic recording media. They allow fast in-situ processable holographic recording as well as indefinite reusability. Moreover high signal-to-noise ratio can be reached as well as high resolutions. We present the results obtained by pulsed holographic interferometry obtained with photorefractive crystals. First experiments showing the potentiality of photorefractive crystals for such applications will be reviewed. Some limitations were pointed out and led us to consider new developments under the frame of an European-funded project. The PHIFE European project (Pulsed Holographic Interferometer for the analysis of Fast Events) aims at developing a full field measurement system at a high repetition rate, based on a double-pulse YAG Q-switch laser. This device will be used for the analysis of vibrations and for aerodynamic studies. Different crystals are considered which are adapted to the fundamental line of the YAG (AsGa or CdTe crystals) or after frequency doubling at 532 nm (Bi/sub 12/SiO /sub 20/). Different crystal configurations and recording geometries are compared. Also different innovative phase quantification techniques are studied and take into account some special properties of the PRCs. We present the results obtained so far in the first development phases of the project [less ▲]

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See detailEnergy restriction during a weight loss program must be stricter in female than male dogs
Jeusette, Isabelle; Biourge, Vincent; Nguyen, Patrick et al

in Proceedings of the ACVIM Forum 2004 (2004, June)

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See detailSolving the m-TSP Problem with Stochastic or Time Dependent Demands
Louveaux, François; Schyns, Michael ULg

in Opasanon, S.; Miller-Hooks, E. (Eds.) Proceedings of TRISTAN V (Triennial Symposium on Transportation Analysis) (2004, June)

There are many examples of problems in transportation where some elements are uncertain. In the distribution of goods as well as systems responding to calls for emergency, demands typically occur in a ... [more ▼]

There are many examples of problems in transportation where some elements are uncertain. In the distribution of goods as well as systems responding to calls for emergency, demands typically occur in a random fashion. Transportation systems have thus to be created in face of uncertainty about future levels of demands, making strategic decisions difficult to take. Similarly, traffic conditions vary randomly over time and travel routes are usually designed in face of uncertainty about traffic conditions, hence about effective travel times. Stochastic models, i.e. models that take uncertainty explicitly into account, have thus a central role to play in transportation. [less ▲]

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See detailAnalytical, physiological and clinical validation of a radioimmunoassay for serum Procollagen Type-III aminoterminal peptide in the dog
Schuller, S.; Valentin, S.; Remy, B. et al

in 14th ESVIM Meeting - Barcelona - Espagne (2004, June)

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See detailProcessing and Characterization of Electrolytes Based on Doped Lanthanum Gallates for IT-SOFCs.
Traina, Karl ULg; Cloots, Rudi ULg

in Bossel, Ulf (Ed.) Sixth European Solid Oxide Fuel Cell Forum - Proceedings (2004, June)

Nowadays a huge interest exists towards the SOFC’s coming out on the large-scale market because of the variety of their advantageous applications. Clean conversion of chemical energy to electricity, co ... [more ▼]

Nowadays a huge interest exists towards the SOFC’s coming out on the large-scale market because of the variety of their advantageous applications. Clean conversion of chemical energy to electricity, co-generation of electricity and chemicals, low levels of noise and vibration, flexibility regarding the fuels used, high efhciency are evidences of this statement. One of the problems that still exist in this field concerns the effective and cost reasonable operation of SOFCs. In this context the lowering of the operation temperatures could be one of the solutions to this important issue. Because of their excellent oxide—ion conductivity and stability over a broad range of oxygen partial pressure, the appropriate doped lanthanum gallates are promising alternative electrolytes for intermediate temperature SOFCs (lT-SOFCs). The aim of this work is to present the experimental results, obtained in a close collaboration between the two Universities. The objects could be briefly outlined, as follows: to process planar electrolytes with different thicknesses, based on doped LaGaO3 via traditional ceramic techniques; to study the influence of the dopants type and their amount on the properties of electrolyte materials synthesized; to investigate the phase formation and phase composition in correlation with the phase diagrams, as well as the microstructure and elements distribution. A special emphasis was placed upon the electrochemical characterization in broad temperature range, using impedance spectroscopy. The results obtained have been discussed in details and conclusions have been drawn by common efforts of the two working groups. [less ▲]

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See detailOn-Line Aircraft Engine Diagnostic Using a Soft-Constrained Kalman Filter
Dewallef, Pierre ULg; Léonard, Olivier ULg; Mathioudakis, Kostas

in Proceedings of the ASME Turbo Expo 2004 (2004, June)

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See detailLe système HACCP : évolution de la législation alimentaire européenne.
Anceau, Christine ULg; Sindic, Marianne ULg; Deroannne, Claude

in Proceedings 4ème Congrès national d'hygiène alimentaire et de nutrition humaine. (2004, June)

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See detailPerformance Study of an Overlay Approach to Active Routing in Ad Hoc Networks
Calomme, Sandrine; Leduc, Guy ULg

(2004, June)

We motivate the use of the active technology for routing in ad hoc networks. We present an active architecture where passive and active nodes can operate together, avoiding any change in the legacy muti ... [more ▼]

We motivate the use of the active technology for routing in ad hoc networks. We present an active architecture where passive and active nodes can operate together, avoiding any change in the legacy muti-hop routing protocol they use. We detail a basic reactive protocol which can be used to build any overlay on top of an ad hoc network. We model it as an active application called Re-Active Routing (RAR). RAR provides dynamic routing in dense and sparse active overlays. We investigate its performance in static and dynamic environments and show that it depends substantially on the active range, i.e. on the allowed maximal number of hops between two active nodes. For a well-chosen active range, RAR achieves good performance even if the mobility level is high and the overlay density is as low as 12.5 %. [less ▲]

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See detailTCP Vegas-like algorithm for layered multicast transmission
Ait-Hellal, Omar; Leduc, Guy ULg

in Communications in Computing (2004, June)

Layered multicast is probably the most elegant solution to tackle the heterogeneity problem in multicast delivery of real-time multimedia streams. However, the multiple join experiments carried out by ... [more ▼]

Layered multicast is probably the most elegant solution to tackle the heterogeneity problem in multicast delivery of real-time multimedia streams. However, the multiple join experiments carried out by different receivers in order to detect the available bandwidth make it hard to achieve fairness. In the present paper, we present a simple protocol, inspired from TCP-Vegas, that reduces considerably the unnecessary join experiments while achieving intra-session and inter-session fairness as well as being TCP-Friendly. [less ▲]

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See detailEtude diachronique, à l’aide de la télédétection, de l’évolution du littoral du sud du delta du Fleuve Rouge (Viet Nam)
de Marneffe, Geneviève; Thrinh, Phan Trong; Tan, Mai Thanh et al

in Bannari, Abderrazak; Blasco (Eds.) Les Xèmes Journées Scientifiques du Réseau Télédétection de l'AUF (2004, May 25)

Dans le cadre de la recherche partagée du réseau de télédétection qui réunit les laboratoires de télédétection de Liège et de Hanoï et dans le cadre des accords de coopération entre le Vietnam et la ... [more ▼]

Dans le cadre de la recherche partagée du réseau de télédétection qui réunit les laboratoires de télédétection de Liège et de Hanoï et dans le cadre des accords de coopération entre le Vietnam et la Région Wallonne (Belgique), l'étude de l'évolution du littoral du sud du delta du Fleuve Rouge a été réalisée. Cette étude comprend deux parties: la première consiste en une présentation générale du delta du Fleuve Rouge. Elle analyse surtout les différents facteurs qui influencent fortement la dynamique littorale (vents, houle, marées…). la deuxième partie est l'étude diachronique du littoral du sud du delta du Fleuve Rouge. Elle s'est effectuée en deux phases : d’abord le traitement et l'analyse de photos aériennes et d'images satellitales, ensuite un travail de vérité-terrain. [less ▲]

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See detailNumerical and analytical investigations on composite sway frames
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Modern Building Materials, Structures and Techniques (2004, May 19)

A modern design code for composite construction such as Eurocode 4 limits its scope to “non-sway buildings” with efficient bracing systems. Therefore, it gives mainly rules to analyse and to check ... [more ▼]

A modern design code for composite construction such as Eurocode 4 limits its scope to “non-sway buildings” with efficient bracing systems. Therefore, it gives mainly rules to analyse and to check structural elements like beams, columns, slabs and joints. However, in the last years, the construction of taller buildings and larger industrial halls without wind bracing systems is susceptible to make global instability a relevant failure mode, what is not yet covered by Eurocode 4. For three years, in the framework of a European research project funded by the European Community for Steel and Coal (ECSC), in which Liège University was deeply involved, intensive experimental, numerical and theoretical investigations have been carried out. The latter aimed at improving the knowledge in the field of sway composite frames and at developing appropriate design rules. The rotational behaviour of the beam-to-column composite joints is one of the key aspects of the problem to which a special attention has been paid. This paper presents numerical and analytical studies carried out at Liège University, as part of the above European project, with the objective to investigate the behaviour of 2D composite sway frames under static loading. Particular phenomena put into sight through different analyses are illustrated herein. [less ▲]

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