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See detailMesures agri-environnementales (MAE) en froment d'hiver
Buyze, Oliver; Doguet, Marie-Paule; Herman, Jean-Luc et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2002, September 12)

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See detailLe froment d'hiver
Couvreur, Luc; Herman, Jean-Luc; Bodson, Bernard ULg et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2002, September 12)

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See detailVariétés de froment en agriculture biologique
Couvreur, Luc; Nihoul, Philippe; Jamart, D. et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2002, September 12)

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

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2002, September 12)

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See detailPregnancy-associated glycoproteins isolated from ewe placenta
El Amiri, B; Remy, B; Melo de Sousa, Noelita ULg et al

in Proceeding of pregnancy-associated glycoproteins isolated from ewe placenta (2002, September 06)

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See detailPregnancy-associated glycoproteins (PAG) concentrations in embryo recipient goats and mated goats
Calero, P; Gonzalez, F; Cabrera, F et al

in Proceeding of pregnancy-associated glycoproteins (PAG) concentrations in embryo recipient goats and mated goats (2002, September 06)

See detailGnRH application in FSH superovulated goats: effect on the number of corpora lutea and embryo yield
Calero, P; Gonzalez, F; Cabrera, F et al

in Proceeding of GnRH application in FSH superovulated goats: effect on the number of corpora lutea and embryo yield (2002, September 06)

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See detailThe monitoring of bovine pregnancies derived from transplantation of in vitro produced embryos
Taverne, M.A.M; Breukelman, S; Perenyi, Z et al

in Proceeding of the monitoring of bovine pregnancies derived from transplantation of in vitro produced embryos (2002, September 06)

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See detailMicro-macro analysis of steel sheet behaviour in finite element simulations. Application to deep-drawing process.
Duchene, Laurent ULg; Godinas, A.; Cescotto, Serge ULg et al

in Cescotto, Serge (Ed.) Proceedings of the Sixth European Mechanics of Materials Conference (EMMC6) Non Linear Mechanics of Anisotropic Materials (2002, September)

This paper presents a constitutive law based on Taylor’s model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation method ... [more ▼]

This paper presents a constitutive law based on Taylor’s model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation method has been developed. This local yield locus model uses a discrete representation of the material’s texture. The interpolation method is presented and a deep-drawing application is simulated in order to show up the influence of the texture evolution during forming processes. [less ▲]

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See detailTreatment of canine nasal aspergillosis with intranasal infusion of enilconazole
Störk, C. K.; Zonderland, J. L.; Saunders, J. L. et al

in 12th ESVIM Meeting - Münich - Allemagne (2002, September)

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See detailOn the exploitation of chaos to build reduced-order models
Kerschen, Gaëtan ULg; Feeny, B. F.; Golinval, Jean-Claude ULg

in International Conference on Noise and Vibration Engineering, Leuven, 2002 (2002, September)

The present study focuses on the model reduction of non-linear systems. The proper orthogonal decomposition is exploited to compute eigenmodes from time series of displacement. These eigenmodes, called ... [more ▼]

The present study focuses on the model reduction of non-linear systems. The proper orthogonal decomposition is exploited to compute eigenmodes from time series of displacement. These eigenmodes, called the proper orthogonal modes, are optimal with respect to energy content and are used to build a low-dimensional model of the non-linear system. For this purpose, the proper orthogonal modes obtained from a chaotic orbit are considered. Indeed, such an orbit is assumed to cover the phase space more uniformly. It is shown that the modes for this particular behaviour are more representative of the system dynamics than any other set of modes extracted from a non-chaotic response. This is applied to a buckled beam with two permanent magnets and the reduced-order model is validated using both qualitative and quantitative comparisons. [less ▲]

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See detailAnalysis of longitudinal data for selection and management
Gengler, Nicolas ULg; Mayeres, Patrick

in Book of Abstracts of the 53rd Annual Meeting of the European Association for Animal Production (2002, September)

Until recently the description of dynamic biological processes was done using static models even if those biological processes such as lactation or growth provided us with longitudinal data. A classical ... [more ▼]

Until recently the description of dynamic biological processes was done using static models even if those biological processes such as lactation or growth provided us with longitudinal data. A classical example was the use of lactational milk yields even if individual test-days describing the underlying lactation curves were available. Similarly for growth, weights were corrected phenotypically to fit into categories like weaning or yearling weights. Several recent developments stimulated the research on alternative methods describing the evolution of the mean and the variances of continuos dynamic biological processes. These developments were especially the extension of repeatability models towards random regressions and the development of the (co)variance function approach, but the development of better computers allowing the storage and the processing of a huge quantity of data. Despite this the analysis of certain types of longitudinal data as test-day yields in large populations and/or international settings is still a major challenge. But a very important aspect of the analysis of longitudinal data is often forgotten: they give us other information than the one classically extracted from genetic evaluation systems. In fact, the detailed modeling of dynamic biological processes provides opportunities for the development of advanced management tools. This may have a large influence on the way genetic evaluation systems may evolve in the future, making them integrated systems for the management and selection of animals. [less ▲]

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See detailApplying the electronic nose in the environment : requirements for the sensors
Nicolas, Jacques ULg; Romain, Anne-Claude ULg; Andre, Philippe ULg

in Szuber, Jacek (Ed.) Papers from the 3rd international seminar on semiconductor gas sensors-SGS 2002, Ustron, Poland, 19-22 september 2002 (2002, September)

For few years, the department "Environmental monitoring" at FUL applies the principle of the electronic nose equipped with tin oxide sensors to recognise and to monitor real life malodours in the ... [more ▼]

For few years, the department "Environmental monitoring" at FUL applies the principle of the electronic nose equipped with tin oxide sensors to recognise and to monitor real life malodours in the environment and directly in the field. <br />For such emissions, the gas mixtures are very complex and only their odour should be of interest, and not their chemical composition. <br />Moreover, working in the field implies various constraints. <br />The obstacles of the monitoring of real life environmental odours with an electronic nose can be classified into three main areas : the final goal of the study (measuring an odorous annoyance), the analysed sample itself (influenced by the evolution of the process and of ambient parameters) and the operating conditions (necessity to transport the reference gas and the batteries in the field, influence of air humidity). <br />The paper describes the approach of FUL to the problem with various tests conducted in the field with home-made electronic noses based on tin oxide sensors and with very simple configurations. The conclusions, which can be extrapolated to any other sensor types, are promising, but the sensor performances (sensibility, reproducibility, electrical consumption, drift, etc.) should still be improved before reaching the final goal. [less ▲]

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See detailIncidence de la météorologie locale sur les fluctuations de population du petit coq de bruyère
Loneux, Michèle ULg; Vandiepenbeeck, Marc

in Fury, René; Joly, Daniel (Eds.) Applications de la climatologie aux échelles fines - Résumés du XVème colloque de l'Association Internationale de Climatologie (2002, September)

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See detailMusculation fonctionnelle : les mouvements de projection
Jidovtseff, Boris ULg; Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg

in Actes du Colloque sur l’intervention dans les APS : rétro/perspectives (2002, September)

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See detailIs canine eosinophilic bronchopneumopathy an asthmatic disease ?
Clercx, Cécile ULg

in 12th ESVIM Meeting - Münich - Allemagne (2002, September)

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See detailPrise en charge isocinétique du sportif de haut niveau : aspects particuliers
Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg

in Actes du Colloque sur l’intervention dans les APS : rétro/perspectives (2002, September)

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See detail"European Cost action F3 on structural dynamics. WG3: identification of non-linear systems.Activities and Results"
Golinval, Jean-Claude ULg; Kerschen, Gaëtan ULg; Lenaerts, V. et al

in International Conference on Noise and Vibration Engineering, Leuven, 2002 (2002, September)

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See detailComparison of Rational-Based and Rule-Based Optimum Design of Ship Structures
Karr, D.; Rigo, Philippe ULg; N a S S et al

in Annual Meeting of SNAME, Paper 19 (2002, September)

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See detailTechniques for a selective encryption of uncompressed and compressed images
Van Droogenbroeck, Marc ULg; Benedett, Raphaël

in ACIVS Advanced Concepts for Intelligent Vision Systems, Proceedings (2002, September)

This paper describes several techniques to encrypt uncompressed and compressed images. We first present the aims of image encryption. In the usual ways to encryption, all the information is encrypted. But ... [more ▼]

This paper describes several techniques to encrypt uncompressed and compressed images. We first present the aims of image encryption. In the usual ways to encryption, all the information is encrypted. But this is not mandatory. In this paper we follow the principles of a technique initially proposed by MAPLES et al. [1] and encrypt only a part of the image content in order to be able to visualize the encrypted images, although not with full precision. This concept leads to techniques that can simultaneously provide security functions and an overall visual check which might be suitable in some applications like, for example, searching through a shared image database. The principle of selective encryption is first applied to uncompressed images. Then we propose a simple technique applicable to the particular case of JPEG images. This technique is proven not to interfere with the decoding process in the sense that it achieves a constant bit rate and that bitstreams remain compliant to the JPEG specifications. Then we develop a scheme called multiple selective encryption, discuss its properties and conclude. [less ▲]

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See detailLa conception des navires rapides à passagers: un défi technologique du début du 21ème siècle.
Rigo, Philippe ULg; Besnard, N.; Goubault, P. et al

in 30th PIANC International Congress (2002, September)

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See detailSuspected inherited laryngeal paralysis-polyneuropathy complex in the pyrenean mountain dog : ultrastructural findings
gabriel Peeters; Braund, K. G.; Van Ham, L. et al

in 12th ESVIM Meeting - Münich - Allemagne (2002, September)

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See detailThe OSIRIS Project (Optical Systems for Interferometric-Photogrammetric Relief Investigation and Scanning). Development of a device for 3D numerical recording of archaeological and epigraphic documents by optoelectronic processes
Laboury, Dimitri ULg; Renotte, Yvon ULg; Tilkens, Bernard et al

in Boehler, Wolfgang (Ed.) PROCEEDINGS OF THE CIPA WG 6 INTERNATIONAL WORKSHOP ON SCANNING FOR CULTURAL HERITAGE RECORDING (2002, September)

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See detailEchocardiographic evaluation of cardiac performance during stimulation with dobutamine in conscious horses: a preliminary study
Sandersen, Charlotte ULg; Delguste, Catherine ULg; Debrue, Marie et al

in Proceedings of the 41st Annual Congress of the British Equine Veterinairy Association (2002, September)

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See detailComputation of simultaneous available transfer capability under thermal and voltage security constraints
Capitanescu, Florin ULg; Van Cutsem, Thierry ULg

(2002, September)

This paper proposes a method to compute the Available Transfer Capability (ATC) of a power system under both thermal and voltage security constraints. The objective is to determine, in some optimal manner ... [more ▼]

This paper proposes a method to compute the Available Transfer Capability (ATC) of a power system under both thermal and voltage security constraints. The objective is to determine, in some optimal manner, the ATC of several simultaneous transactions, such that any postulated contingency does not cause voltage instability nor thermal overloads. Thermal constraints are derived for every branch likely to be overloaded in post-contingency states. Voltage security constraints are derived from voltage unstable post-contingency scenario, obtained by Quasi Steady- State simulation, a fast time-domain method. The paper also addresses the discrimination problem, i.e. the fact that the computed ATC might favor some trades to the detriment of others. Variants will be discussed to deal with such situations. The method is illustrated on an 80-bus test system. [less ▲]

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See detailDevelopment of a Multiple Modes Simulator of Rotating Bladed Assemblies for Blade Tip-Timing Data Analysis
Gallego-Garrido, Jon; Dimitriadis, Grigorios ULg; Wright, Jan Robert

in Van Hal, B.; Sas, P. (Eds.) Proceedings of the 2002 International Conference on Noise and Vibration Engineering (2002, September)

Blade Tip Timing (BTT) is a promising technique for the measurement of blade-tip vibrations in bladed assemblies. After an engine test is performed, the vibration’s Engine Order (EO) and amplitude ... [more ▼]

Blade Tip Timing (BTT) is a promising technique for the measurement of blade-tip vibrations in bladed assemblies. After an engine test is performed, the vibration’s Engine Order (EO) and amplitude information is recovered from the collected BTT data using suitable analysis methods. The validation of such analysis methods can be carried out more conveniently on simulated BTT data. In this paper, a BTT data simulator is developed to produce controlled BTT data for bladed assemblies in which multiple modes of vibration are excited. The mathematical model used allows for multiple blade modes and multiple assembly modes to be simulated. Additionally, single or multiple, integral and non-integral EO excitations can be selected and the rotational speed of the assembly can be varied linearly. Results from several test cases are shown, demonstrating that the simulator successfully emulates assembly and blade mode combinations. A number of BTT analysis methods were able to recover with accuracy the correct EOs from the simulated BTT data. [less ▲]

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See detailTumor cell and stromal cell interactions during breast cancer progression
Noël, Agnès ULg; Foidart, Jean-Michel ULg

in Journal of Molecular Medicine (2002, September)

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See detailAssessment of detection thresholds of metal oxide sensors based e-nose to the pollution emitted by odorous sources.
Nicolas, Jacques ULg; Romain, Anne-Claude ULg

in Proceedings of the Ninth international symposium on olfaction and electronic nose ISOEN'02 (2002, September)

The paper describes a method to assess the global concentration level of a complex odorous gas mixture which is detected by an electronic nose, and consequently to assess the detection threshold of the ... [more ▼]

The paper describes a method to assess the global concentration level of a complex odorous gas mixture which is detected by an electronic nose, and consequently to assess the detection threshold of the instrument for that particular odour. The studied case is the odour generated by urban waste composting facilities. The measurement is performed in the lab with an array of 12 tin oxide gas sensors on samples collected near the emission. The selected method consists in finding an equivalence between the response of each individual sensor to the concentrations of ethanol used as a standard gas and the responses to various dilution of the original sample. The main issues of that procedure are the order of magnitude of the "concentration" of the non-diluted compost emission sample expressed in ethanol-equivalent and the detection threshold of the sensor array for the compost gas. The latter result requires a suitable definition of the detection threshold, based on the signal to noise ratio. The conclusion is that the detection threshold of Tagushi sensors, expressed in equivalent-ethanol, is generally lower than 1 ppmv and is just slightly higher than the perception threshold of the human nose for the odour gener-ated by compost. [less ▲]

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See detailSerotype Distribution of clinical isolates of group B streptococci Isolated in Belgium : isolates from neonatal infection compared to isolates from infection in adult or colonization in pregnant women
MELIN, Pierrette ULg; Keke, D.; Campo, B. et al

in American Society of Microbiology (Ed.) Program and Abstracts of the 43rd Intersciences Conference on Antimicrobial Agents and Chemotherapy (2002, September)

Background: Group B Streptococci cause invasive disease in neonates, pregnant women and non-pregnant adults. In the last decades capsular serotypes (type) Ia, Ib, II and III caused the majority of ... [more ▼]

Background: Group B Streptococci cause invasive disease in neonates, pregnant women and non-pregnant adults. In the last decades capsular serotypes (type) Ia, Ib, II and III caused the majority of clinical diseases. More recently, in North America, type V emerged as the more common type in non-pregnant adults with invasive disease. Methods: From January 1999 through December 2001, we received and typed a total of 334 clinically significant strains of GBS isolated in the laboratories belonging to the Belgian network for epidemiological surveillance. 113 were recovered from neonates blood or cerebrospinal fluid (92 early onset EOD, 21 late onset LOD), 14 were isolated from pregnant women with severe infections and 204 were recovered from adults with invasive disease. From the same laboratories, during the first trimester of 2002, 302 isolates from pregnant women were also typed (max. 5 isolates /lab.) Results: In neonatal EOD type III was the more common (41,3%) followed by II (19.6%), Ia (16.3%), Ib (13%), V (8.7%) and IV (1.1%), whereas type III caused the majority (85.7%) of LOD cases. In adults, all types were well represented except type IV: 20.3% Ia, 12.7% Ib, 13.1% II, 23.1% III, 2.7% IV, 19% V and 9% remained non typeable (NT). In colonized pregnant women, all types were also well represented except type IV: 25.5% Ia, 13.3% Ib, 14.9% II, 17.7% III, 5% IV, 15.5% V and 8.1% remained NT. Type III was more frequently the cause of EOD than a colonizing strain during pregnancy and in contrast NT isolates did not cause EOD (P<0.001) Conclusions: 1) Type III was still the major type in neonatal infections in Belgium. 2) Type distribution of GBS differed by age-group of patients 3) Type V belonged to the 3 more represented types in adults 4) Compared to colonizing GBS in pregnant women, distribution of types causing EOD was different. [less ▲]

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See detailAg/SiO2 and Cu/SiO2 cogelled xerogel catalysts for benzene combustion and 2-butanol dehydrogenation
Lambert, Stéphanie ULg; Tcherkassova, Natalia; Cellier, Caroline et al

in CD-ROM of full texts of the 15th International Congress on Chemical and Process Engineering, CHISA 2002 (Paper P1.24, 9 p.) (2002, August 25)

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See detailAtmospheric perturbations on GNSS signals and their influence on time transfer
Warnant, René ULg

in Proceedings of the XXVII URSI General Assembly (2002, August)

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See detailRumen bypass of free methionine and lysine for double-muscled Belgian Blue bull.
Froidmont, Eric; Rondia, Pierre; Beckers, Yves ULg et al

(2002, August)

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See detailAn Adaptation of the Newmark Scheme for the Integrated Simulation of Mechatronic Systems
Bruls, Olivier ULg; Duysinx, Pierre ULg; Golinval, Jean-Claude ULg

in Proceeding of 6th Int. Conf. on Motion and Vibration Control (MOVIC) (2002, August)

A methodology is developed to simulate flexible multibody systems subject to the action of a digital control system. The mechanical model is built in the formalism of flexible multibody dynamics using the ... [more ▼]

A methodology is developed to simulate flexible multibody systems subject to the action of a digital control system. The mechanical model is built in the formalism of flexible multibody dynamics using the Finite Element Method. At the begining of each sampling period, the model of the control system is used to compute the control forces and torques applied to the mechanism. A second-order system with a direct velocity feedback controller is considered to study the performances of the method. A modification of the classical Newmark algorithm yields outstanding improvements in the results quality. [less ▲]

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See detailControlled Radical Polymerisation catalysed by rutehnium complexes. Variations on Ru-Cp#
Demonceau, Albert ULg; Delfosse, Sébastien; Guillaume, Bernard et al

in ACS Symposium Series (2002, August)

series of isoelectronic ruthenium-based complexes of the general formula [RuX(Cp#)L2] (Cp# = cyclopentadienyl or cyclopentadienyl derivatives) were synthesized, and their relative catalytic activities ... [more ▼]

series of isoelectronic ruthenium-based complexes of the general formula [RuX(Cp#)L2] (Cp# = cyclopentadienyl or cyclopentadienyl derivatives) were synthesized, and their relative catalytic activities were determined by monitoring the atom transfer radical polymerization of methyl methacrylate, n-butyl acrylate, and styrene. [RuCl(Cp*)(PPh3)2] and [RuCl(Ind)(PPh3)2] were found to be highly efficient catalysts for ATRP, producing polymers with narrow molecular weight distribution (Mw/Mn < 1.2). the following order of increasing efficiency was determined: [RuCl(Cp)(PPh3)2] << [RuCl(ind)(PPh3)2] < [RuCl(Cp*)(PPh3)2]. In sharp contrast, ruthena-carboranes were inefficient for ATRP, demonstrating therefore the prominent role of the Cp# ligand. The effect of the phosphine ligands was also investigated, and additional studies indicated that the release of a phosphine ligand occured prior to the activation of the carbon-halogen bond of both the initiator and polymer growing chain end by the unsaturated ruthenium center. [less ▲]

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See detailOperational model for real-time reconstruction of the electron density profile using GPS TEC measurements
Stankov, Stanimir; Warnant, René ULg; Jodogne, Jean-Claude

in Proceedings of the XXVII URSI General Assembly (2002, August)

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See detailVALIDATION OF “PROCULTURE” MODEL TO PREDICT SEPTORIA TRITICI DEVELOPMENT ON WINTER WHEAT IN THE GRAND-DUCHÉ OF LUXEMBOURG IN 2001.
El Jarroudi, Moussa ULg; Tychon, Bernard ULg; Maraite, Henri

in Villalobos, Francisco J.; Testi, Luca (Eds.) VII Congress of the European Society For Agronomy (2002, July)

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See detailPreseason isokinetic assessment and hamstring strain risk in professional soccer players
Croisier, Jean-Louis ULg; Réveillon, Vincent; Ferret, J. M. et al

in Proceedings of the 7th Annual Congress of the European College of Sport Science (2002, July)

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See detailEccentric training model in chronic epicondylitis treatment
Forthomme, Bénédicte ULg; Croisier, Jean-Louis ULg; Foidart-Dessalle, Marguerite ULg et al

in Proceedings of the 7th Annual Congress of the European College of Sport Science (2002, July)

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See detailSensitivity Analysis on Ultimate Hull Bending Moment and Multi-Criteria Comparative Analysis of Existing Method
Rigo, Philippe ULg; Toderan, Catalin; Quesnel, T.

in Conf ASRANet, Integrating Structural Reliability Analysis with Advanced Structural Analysis, Session 8 (2002, July)

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See detailDétection des moisissures de l'habitat par un nez électronique
kuske, martyna; Romain, Anne-Claude ULg; Nicolas, Jacques ULg

in actes des conférences Eurodeur-airodeur (2002, June 25)

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See detailExtension of Lyman-alpha Complexes from HST Observations of Four Pairs of Quasars
Aracil, B.; Petitjean, P.; Smette, A. et al

in Combes, F.; Barret, D. (Eds.) SF2A-2002: Semaine de l'Astrophysique Francaise (2002, June 01)

We present HST observations of four pairs of quasars with 2,3 arcmin angular separation and redshift z 0.9. We apply the Nearest-Neighbor method to the sample of observed Lyman-alpha lines with rest ... [more ▼]

We present HST observations of four pairs of quasars with 2,3 arcmin angular separation and redshift z 0.9. We apply the Nearest-Neighbor method to the sample of observed Lyman-alpha lines with rest equivalent width greater than 0.3 Angstrum. According to Monte-Carlo simulations, we detect an excess of coincidences with velocity difference smaller than 500 km/s. [less ▲]

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See detailAutomata-based Representations for the Verification of Hybrid Systems
JODOGNE, Sébastien ULg

in Proc. Summer School Modelling and Verification of Parallel Processes (MOVEP) (2002, June)

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See detailEvaluating bound on voltage and thermal security margins under power transfer uncertainty.
Van Cutsem, Thierry ULg

(2002, June)

This paper deals with the evaluation of bounds on voltage and thermal security margins with respect to contingencies. A margin is the maximal pre-contingency power transfer between either a generation and ... [more ▼]

This paper deals with the evaluation of bounds on voltage and thermal security margins with respect to contingencies. A margin is the maximal pre-contingency power transfer between either a generation and a load area or two generation areas, such that specirfied contingencies do not overload lines or make the system voltage unstable. The minimum and maximum margins are computed for given intervals of variations of bus injections. Each bound is the solution of a constrained L1-norm minimization (or maximization) problem, for which specific algorithms are given. Thermal overloads are handled through linearization, while for voltage stability, fast time simulation and instability mode analysis are used. Nonlinear situations of branch overload are also considered. The method is illustrated on an 80-bus test system. [less ▲]

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See detailEvaluating bounds on voltage and thermal security margins under power transfer uncertainty
Capitanescu, Florin ULg; Van Cutsem, Thierry ULg

(2002, June)

This paper deals with the evaluation of bounds on voltage and thermal security margins with respect to contingencies. A margin is the maximual pre-contingency power transfer between either a generation ... [more ▼]

This paper deals with the evaluation of bounds on voltage and thermal security margins with respect to contingencies. A margin is the maximual pre-contingency power transfer between either a generation and a load area or two generation areas, such that the specified contingencies do not overload lines or make the system voltage unstable. The minimum and maximum margins are computed for given intervals of variations of bus injections. Each bound is the solution of a constrained L1-norm minimization (or maximization) problem, for which specific algorithms are given. Thermal overloads are handled through linearization, while for voltage stability, fast time simulation and instability mode analysis are used. Nonlinear situations of branch overloads are also considered. The method is illustrated on an 80-bus test system. [less ▲]

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See detailThe GENIE nulling experiment
Absil, Olivier ULg; Gondoin, Ph; den Hartog, R. et al

in Combes, F. (Ed.) SF2A-2002: Semaine de l'Astrophysique Francaise (2002, June)

Within the frame of the Darwin program, the European Space Agency and the European Southern Observatory (ESO) intend to build a ground-based technology demonstrator called Darwin-GENIE, using the Very ... [more ▼]

Within the frame of the Darwin program, the European Space Agency and the European Southern Observatory (ESO) intend to build a ground-based technology demonstrator called Darwin-GENIE, using the Very Large Telescope Interferometer (VLTI). The main objective of GENIE is to gain experience in the manufacture and operation of a nulling interferometer representative of the ESA IRSI-Darwin space mission. GENIE will prepare the Darwin science programme through a systematic search for exo-zodiacal dust clouds around Darwin candidate targets. GENIE also aims to perform Darwin related science including the detection of low-mass companions (if possible, hot Jupiters) around nearby stars. The prospective performances of some candidate configurations are presented in this paper. [less ▲]

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See detailSimulation of an Active Control System in a Hot-Dip Galvanizing Line
Bruls, Olivier ULg; Golinval, Jean-Claude ULg

in Preprints of the NATO Advanced Study Institute on Virtual Nonlinear Multibody Systems (2002, June)

This paper concerns the modeling and the integrated numerical simulation of a flexible mechanism subject to the action of a digital control system. A general method is proposed, based on the formalism of ... [more ▼]

This paper concerns the modeling and the integrated numerical simulation of a flexible mechanism subject to the action of a digital control system. A general method is proposed, based on the formalism of flexible multibody systems (MBS) using the Finite Element Method (FEM). Nonlinear effects in the mechanical structure or in the control system can be taken into account. The numerical simulation tool is applied to design an active control system in a hot-dip galvanizing line, which aims at reducing the vibrations of the steel strip. [less ▲]

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See detailFeature extraction for non-linear model updating
Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in International Conference on Structural Dynamics Modelling, Funchal, 2002 (2002, June)

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See detailCharacterisation of TRIP-assisted steel by atomic force microscopy and OIM
Ros-Yanez, Tanya; Houbaert, Yvan; Petrov, Roumen et al

in De Cooman, Bruno C. (Ed.) Proceedings of the International Conference on TRIP-Aided High-Strength Ferrous Alloys (2002, June)

TRIP-assisted steel has a complicated microstructure, obtained through well designed heat treatments and consisting of different phases, mainly ferrite, retained austenite, bainite and martensite. The ... [more ▼]

TRIP-assisted steel has a complicated microstructure, obtained through well designed heat treatments and consisting of different phases, mainly ferrite, retained austenite, bainite and martensite. The drastic influence of microstructure on physical and mechanical properties makes metallographic examination a necessity for property understanding and enhancement. A fairly simple tint etching procedure (LePera method) using light microscopy and SEM observation ensures the distinction of ferrite, bainite and retained austenite/martensite grains. Nevertheless, the etching is not selective enough to allow a distinction between retained austenite and martensite. Atomic force microscopy was used for the phase identification and characterisation of this kind of steel. A series of tests was performed using AFM-contact mode and magnetic force microscopy in C-Mn-Si and C-Mn-Al TRIP-assisted steel after intercritical annealing followed by ageing, After ageing, some samples were tempered in order to make metallographic observation easier. It has been possible to identify the different phases and their topographic characteristics and to study their morphology using AFM. Orientation imaging microscopy was used to calibrate the observations done with AFM, distinguishing between bcc- and fcc-zones and quantify the retained austenite. [less ▲]

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See detailOn the optimisation of the mechanical properties of two aluminium-alloyed multiphase TRIP-assisted steels
Mertens, Anne ULg; Jacques, Pascal J.; Harlet, Philippe et al

in De Cooman, Bruno C. (Ed.) Proccedings of the International Conference on TRIP-Aided High Strength Ferrous Alloys (2002, June)

Aluminium-alloyed multiphase TRIP-assisted steels have been recently developed, so as to get rid of the disdavantages related to the high silicon contents classically used so far in TRIP-assisted steels ... [more ▼]

Aluminium-alloyed multiphase TRIP-assisted steels have been recently developed, so as to get rid of the disdavantages related to the high silicon contents classically used so far in TRIP-assisted steels. It has been shown that aluminium has a stronger ferritising effect than silicon and that it is slightly less efficient as far as austenite retention is concerned. A careful selection of the aluminium content and of the processing conditions is thus of primary importance in order to optimise the mechanical properties. The present study aims at determining the optimal heat treatment conditions leading to enhanced mechanical properties for two low aluminium-alloyed grades containing with mass contents of 0.12% C, 1.5% Mn and 0.5% Al or 1.0% Al, respectively. The microstructures generated during the heat treatment were assessed using SEM, X-ray diffraction and Mössbauer spectrometry. The mechanical properties were evaluated by uniaxial tensilte testing and the strain-hardening behaviour was characterised by means of an incremental strain-hardening exponent. The relations between the observed microstructures and the mechanical properties were discussed and, as a consequence, the importance of a careful control of the isothermal bainitic holding was highlighted. [less ▲]

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See detailComparaison quantitative de différentes techniques de restauration rapide dans les réseaux IP/MPLS
Mélon, Laurent; Leduc, Guy ULg

in Obaid, A. (Ed.) Ingénierie des protocoles - Réseaux mobiles et ad hoc, qualité de service, multimédia, ingénierie de trafic (2002, May 27)

This article is dealing with a quantitative comparison of different fast restoration approaches in the context of a Multi-Protocol Label Switching (MPLS) network. The objective is to analyse the general ... [more ▼]

This article is dealing with a quantitative comparison of different fast restoration approaches in the context of a Multi-Protocol Label Switching (MPLS) network. The objective is to analyse the general behaviour of these approaches (local rerouting, edge-to-edge rerouting, ...) in case of failure by means of simulations. This study is realised in the context of Best Effort only traffic, routing being done with a shortest paths algorithm. Many papers justify the choice between an edge-to-edge or a local scheme by means of intuition and then present a new algorithm for routing backup paths which try to optimize some parameters. Our approach aims to clarify the situation by comparing by means of concrete results the pros and cons of each mechanism. [less ▲]

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See detailAdaptation dynamique des débits des couches pour la transmission vidéo multipoint
Bonmariage, Nicolas; Leduc, Guy ULg

in Obaid, A. (Ed.) Ingénierie des protocoles - Réseaux mobiles et ad hoc, qualité de service, multimédia, ingénierie de trafic (2002, May 27)

The heterogeneous environment of multicast video streams naturally raises a network performance issue which can be addressed using a layered transmission scheme. A receiver is able to adapt the flow rate ... [more ▼]

The heterogeneous environment of multicast video streams naturally raises a network performance issue which can be addressed using a layered transmission scheme. A receiver is able to adapt the flow rate to its capacity by choosing an adequate subscription level among the different layers. A traditional static approach doesn't allow a full usage of the network capacity and should be combined with an adaptive transmission rate in each layer. We study the dynamic rate adaptation problem and develop a framework integrating a multirate adaptation algorithm and a transmission protocol for layered multicast video. Our main focus is the development of an adaptation algorithm offering rates matching the capacities of the receivers. We also want to set up a congestion control scheme and offer fairness towards TCP flows, while keeping a scalable framework. We evaluate and analyze the proposed architecture using simulations to point out its main characteristics. [less ▲]

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See detailL'approche en "Coût Client", une méthologie de calcul des coûts propre à l'entreprise orientée "Client"
Van Caillie, Didier ULg; Kabwigiri, Charles ULg

in Association Francophone de Comptabilité (Ed.) Actes du 23ème Congrès Francophone de Comptabilité (2002, May 16)

This paper explores, essentially in a conceptual perspective, a new cost accounting method focused on the characteristics of a "client-oriented" company and allows to fuel its management control ... [more ▼]

This paper explores, essentially in a conceptual perspective, a new cost accounting method focused on the characteristics of a "client-oriented" company and allows to fuel its management control information system with specific data on which both operational and strategic management decisions may be based. The first step of its implementation into a company from the wood industry is also discussed. [less ▲]

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See detailErysipelothrix rhusiopathiae infection in stranded harbour porpoise (Phocoena phocoena) and harbour seal (Phoca vitulina)
Boseret, Géraldine ULg; Jauniaux, Thierry ULg; Mainil, Jacques ULg

in anton, erken (Ed.) Proceedings of the 4th scientific meeting of the European Association of Zoo and Wildlife Veterinarians and 5th meeting of the European Wildlife Disease Assocation : Heidelberg, Germany 2002 / editor Anton ERKEN. (2002, May 08)

An adult female harbour porpoise (Phocoena phocoena ) and a juvenile male harbour seal have been found dead on a Belgian beach in autumn 2001. The two bodies were in good condition (CC = 2). Pure and ... [more ▼]

An adult female harbour porpoise (Phocoena phocoena ) and a juvenile male harbour seal have been found dead on a Belgian beach in autumn 2001. The two bodies were in good condition (CC = 2). Pure and abundant growth of a small rod-shaped, Gram-labile bacterium was obtained aerobically and anaerobically on Columbia bloodagar from the heart blood, the mouth, the pharynx, the lungs, the intestine and the anus of the porpoise, and from the intestine, the pharynx, the mouth, the nose and the anus of the seal. The colonies were surrounded by a narrow zone of a-hemolysis. The catalase- and peroxydase-tests gave negative results. Rapid ID 32 Strepto (Biomérieux, France) sugar tests applied on porpoise’s heart blood, lungs and intestine, and on seal’s intestine and pharynx identified this isolate to Erysipelothrix rhusiopathiae. Erysipelothrix rhusiopathiae is not reported as a common cause of infection and death in wild cetaceans and wild pinnipeds in opposite to respectively captive dolphins and sea lions. Nevertheless, E. rhusiopathiae can be considered as the cause of death of the stranded harbour porpoise as it was present in heart blood and internal organs, and the seal was carrying the bacterium with lesions of enteritis which could be associated with E. rhusiopathiae infectio [less ▲]

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See detailPreliminary results for measuring bovine PAG in milk samples
Metelo, R; Sulon, J; Moreira da Silva, F et al

in Proceeding of preliminary results for measuring bovine PAG in milk samples (2002, May 03)

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See detailIncreased cell proliferation-but not reduced cell death-induces lymphocytosis in Bovine Leukaemia Virus-infected sheep
Debacq, Christophe; Asquith, B.; Kerkhofs, Pierre et al

in Abstracts of papers presented at the 2002 meeting of retroviruses (2002, May)

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See detailIntegrated simulation of mechanical structures and their control system
Bruls, Olivier ULg; De Boe, Pascal; Duysinx, Pierre ULg et al

in Proc. of the 2nd Int. Conf. on Advanced Computational Methods in Engineering (ACOMEN) (2002, May)

This paper concerns the modeling and the integrated numerical simulation of flexible mechanisms subject to the action of a digital control system. A general method is proposed, based on the formalism of ... [more ▼]

This paper concerns the modeling and the integrated numerical simulation of flexible mechanisms subject to the action of a digital control system. A general method is proposed, based on the formalism of flexible multibody systems (MBS) using the Finite Element Method (FEM). Nonlinear e ects in the mechanical structure or in the control system can be taken into account. The numerical simulation tool is applied to design an active control system in a hot-dip galvanizing line, which aims at reducing the vibrations of the steel strip. [less ▲]

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See detailUtilisation de la méthode LQRT (Lecture / Questions - Réponses / Test) -- SAFE (Système Adulte de Formation et d'Évaluation) en médecine vétérinaire.
Castaigne, Jean-Loup ULg

in Actes du 19ème Colloque de l'AIPU : Les méthodes actives dans l'enseignement supérieur : Regards pluriels et critiques sur les pratiques. (2002, May)

Suite aux résultats d’une évaluation des enseignements par les étudiants, nous avons décidé de mettre en place une nouvelle stratégie de formation centrée sur l’étudiant. La méthode des LQRT (Lecture ... [more ▼]

Suite aux résultats d’une évaluation des enseignements par les étudiants, nous avons décidé de mettre en place une nouvelle stratégie de formation centrée sur l’étudiant. La méthode des LQRT (Lecture, Questions-Réponses, Test) - SAFE (Système Adulte de Formation et d’Évaluation) a été choisie pour dispenser 5 cours portant sur des matières dont la compréhension est importante pour la réussite de l’examen oral de fin d’année. La conclusion directe de l’utilisation de ce système d’enseignement a été une participation plus active des étudiants au cours mais également une responsabilisation de l’apprenant dans le processus de formation par la définition des performances cognitives. Les tests pratiqués durant l’année constituent une évaluation diagnostic pour l’enseignant qui a pu remédier dès le cours suivant aux problèmes de compréhension mis en évidence par le test. Les retombées indirectes comme les gains métacognitifs et l’acquisition d’autres compétences ne sont pas mesurables. Une nouvelle évaluation de l’enseignement a montré que les étudiants ont apprécié l’instauration des LQRT-SAFE en médecine vétérinaire. [less ▲]

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See detailSpringback Prediction in Sheet Metal Forming
Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in Proceedings of ACOMEN 2002 (2002, May)

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See detailSelection of approximation schemes in topology optimization
Bruyneel, Michaël ULg; Duysinx, Pierre ULg

in Hogge, Michel (Ed.) Proceedinsg of the ACOMEN 2002, 2nd International Conference on Advanced Computational Methods in Engineering (2002, May)

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See detailEncapsulation of thrombin receptor agonist peptide in PLGA beads
Grandfils, Christian ULg; Markvicheva, E; Barakat, I et al

in COST Proceedings, S.II-2, 33-36 (2002, April 26)

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See detailThe concept of "Economic Added Result", a new tool to prevent bankruptcy ?
Van Caillie, Didier ULg; Dighaye, Andrée

in European Accounting Association (Ed.) Proceedings of the 25th European Accounting Association Congress (2002, April 25)

Business failure has been one of the most investigated topics in the finance and the strategic literature during the last seven decades. However, most of this literature has been heavily focused on ... [more ▼]

Business failure has been one of the most investigated topics in the finance and the strategic literature during the last seven decades. However, most of this literature has been heavily focused on business failure prediction (with a clear focus on short-term prediction) and, simultaneously, only a few studies have investigated business failure prevention, focusing on understanding how a company may fail through "failure paths" and on the identification of very early warning financial and non-financial signals and symptoms. This may be explained by a conceptual difficulty to exactly represent what business failure prevention may mean and by a practical difficulty to build a financial indicator really allowing to announce a bankruptcy at least three years or more in advance, giving then time to potential corporate recovery. With this paper, we then propose an investigation of this concept of "Business Failure Prevention" and we test on a sample of 6 250 Belgian SMEs the ability of a specific financial indicator (referred as "Economic Added Result" and based on the amount of accounting value added which remains within a company when it has paid for its internal and external production factors) to effectively predict a business failure at least three years before it happens. [less ▲]

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See detailLe règlement préventif des conflits entre actionnaires
Kohl, Benoît ULg; Matray, Didier ULg

in Le règlement des conflits entre actionnaires (2002, April 02)

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See detailAlgorithms for openings of binary and label images with rectangular structuring elements
Van Droogenbroeck, Marc ULg

in Talbot, Hugues; Beare, Richard (Eds.) International Symposium on Mathematical morphology (ISMM) (2002, April)

Two new families of algorithms for computing openings of binary and label images are presented in this paper. The first family of algorithms is based on an horizontal scan, and a vertical scan that takes ... [more ▼]

Two new families of algorithms for computing openings of binary and label images are presented in this paper. The first family of algorithms is based on an horizontal scan, and a vertical scan that takes the result of the horizontal scan as input. With the results of these two scans it is possible to compute an opening with respect to a rectangle of any size. The second family of algorithms is based on the construction of an exhaustive list of rectangles included in an object. Rectangles of this list all have a maximal extension, i.e. no larger rectangle included in a region contains them. The opening then results from filling the output image with rectangles larger than the structuring element. After a description of the algorithms we provide a comparison of several algorithms in terms of computation time efficiency. The comparison shows that some of the new algorithms advantageously compete with existing algorithms. [less ▲]

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See detailIdentification of the nonlinear function in a vibrating nonlinear beam
Dimitriadis, Grigorios ULg; Cooper, Jonathan E

in Lees, A. W.; Prells, U.; Norton, J. (Eds.) Proceedings of the Third International Conference on Identification in Engineering Systems (2002, April)

The Constant Level Identification (CLI) method for nonlinear dynamical systems has been shown to identify accurately a wide variety of systems with discrete degrees of freedom. In this paper, the method ... [more ▼]

The Constant Level Identification (CLI) method for nonlinear dynamical systems has been shown to identify accurately a wide variety of systems with discrete degrees of freedom. In this paper, the method is applied to a continuous nonlinear system, namely a simulated model of a vibrating beam attached to a nonlinear spring. A Rayleigh-Ritz series representation of the beam is assumed in order to extract the desired number of modal responses. Then, a combination of modal and physical coordinates are used in the identification process. It is shown that the CLI method can accurately capture the shape of the nonlinearity in the system. [less ▲]

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See detailL'EAD au service d'une approche centrée sur l'apprenant et sur la médiatisation de l'expérience
Georges, François ULg; Demily, Fabian; Leclercq, Dieudonné ULg et al

(2002, April)

Le Laboratoire de Soutien à l’Enseignement Télématique (LabSET, directrice : M. Poumay) a, entre autres, pour mission d’aider les enseignants et les formateurs à concevoir et à développer leurs cours et ... [more ▼]

Le Laboratoire de Soutien à l’Enseignement Télématique (LabSET, directrice : M. Poumay) a, entre autres, pour mission d’aider les enseignants et les formateurs à concevoir et à développer leurs cours et activités sur Internet. Nous travaillons non seulement avec des institutions d’enseignement supérieur (Université et Hautes Ecoles), mais aussi avec des centres de formation, des centres de compétences, des organismes d’insertion socio-professionnelle et des fédérations d’entreprises. Ces partenariats ont dernièrement fait l’objet de deux projets : Technifutur, du nom de son commanditaire, et FORMADIS subsidié par la Communauté Européenne, le Ministère de l’emploi et de la formation de la région wallonne et le Ministère de l’enseignement supérieur de la Communauté Française de Belgique. L'article décrit ces initiatives. [less ▲]

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See detailSeismic Tomography and Ground Penetrating Radar Applied On Rock Slope Instability Analysis. Application On A Limestone Cliff In The Chartreuse Massif, France
Dussauge-Peisser, C; Wathelet, M; Jongmans, D et al

in EGS General Assembly Conference Abstracts (2002, April)

Abstract: Evaluating the stability state of a rock slope is a complex problem, mainly due to the number of possible failure mechanisms, and to the lack of knowledge of the real present state of the rock ... [more ▼]

Abstract: Evaluating the stability state of a rock slope is a complex problem, mainly due to the number of possible failure mechanisms, and to the lack of knowledge of the real present state of the rock mass. Geophysical methods appear as a useful tool for inves-tigating the deep discontinuity pattern, which is poorly known from surface observa-tions. However they have seldom been applied on steep rock slopes. The aim of this study is to test some of these methods on subvertical cliffs. We investigate the quality of information that they can ... [less ▲]

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See detailSevere Psittacosis in Children
Senterre, Thibault ULg; Lepage, Philippe; Senterre, Jean-Marc

in 10th International Congress of Infectious Disease (2002, March 12)

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See detailLa responsabilité des administrateurs dans les entreprises en difficulté
Kohl, Benoît ULg; Matray, Didier ULg; Duvieusart, Christian

in La faillite et le concordat cinq ans après la réforme (2002, March 08)

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See detailForm@HETICE : un dispositif de formation continuée des formateurs d'enseignants à un usage critique des Technologies de l'Information et de la Communication
Charlier, B.; Denis, Brigitte ULg

in Actes du 2e Congrès des chercheurs en Éducation (2002, March)

Form@HETICE1 est un dispositif original de formation continuée des formateurs d’enseignants à un usage critique des Technologies de l’Information et de la Communication au sein des catégories pédagogiques ... [more ▼]

Form@HETICE1 est un dispositif original de formation continuée des formateurs d’enseignants à un usage critique des Technologies de l’Information et de la Communication au sein des catégories pédagogiques des Hautes Ecoles (HE). Deux problématiques complémentaires guident la conception de ce dispositif : celle des usages éducatifs des TIC aux niveaux de la formation des futurs enseignants et des pratiques dans les écoles primaires et secondaires (Quels usages éducatifs des TIC?) (Denis, 2002) et celle plus globale de l’implantation d’une innovation qui tient compte du contexte organisationnel au sein duquel ce processus prend place : une rénovation d’ensemble des programmes de formation d’enseignants promue par le Ministère de la Communauté française (Quelle démarche d’intégration des TIC dans les pratiques de formation des enseignants ?). La prise en compte de ces deux problématiques a conduit une équipe de recherche collaborative à proposer des actions complémentaires qui dépassent la simple organisation de sessions de formation : • la mise en place d’un réseau de partage de ressources, • l'organisation de formations adaptées aux besoins des personnes ressources, • l'accompagnement de projets d'équipe dans chacune des Hautes Ecoles, • des actions parallèles concernant l’installation de « cybercentres » dans les établissements. Ces actions visent à produire un effet démultiplicateur : des personnes ressources participant au réseau forment leurs collègues, qui à leur tour forment les futurs enseignants amenés à introduire les TIC dans les activités menées avec leurs élèves. [less ▲]

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See detailNumerical determination of 3D temperature fields in steel joints
Franssen, Jean-Marc ULg; Brauwers, Luc

in Proceedings of the 2nd International workshop Structures in Fire (2002, March)

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See detailAn entropy based technique for information embedding in images
Van Droogenbroeck, Marc ULg; Delvaux, Jérôme

in IEEE Signal Processing Symposium, Proceedings (2002, March)

Many information hiding techniques have recently been analyzed as they could help manage part of the digital rights. Among the general framework of information hiding, the focus has been put on ... [more ▼]

Many information hiding techniques have recently been analyzed as they could help manage part of the digital rights. Among the general framework of information hiding, the focus has been put on steganography and on watermarking techniques. This paper proposes an entropy based technique for data embedding in images with a specific target, sometimes referred to as feature location: inclusion of a maximum amount of information instead of robustness against attacks. After an introduction, we analyze the error that results from a modification of the least significant bits. Then we describe our embedding technique. Finally we examine the upper bound of information that can be embedded in the least significant bits by means of our technique and we conclude. [less ▲]

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See detailLes conseils de fumure azotée
Bodson, Bernard ULg; Destain, Jean-Pierre ULg; Vancutsem, Françoise ULg et al

in Livre Blanc: Céréales - Gembloux (2002, February 27)

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See detailFongicides en froment
Moreau, Jean-Marc; Bodson, Bernard ULg; Vancutsem, Françoise ULg

in Livre Blanc: Céréales - Gembloux (2002, February 27)

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See detailEvolution du fractionnement de la fumure azotée
Bodson, Bernard ULg; Vancutsem, Françoise ULg; Falisse, André

in Livre Blanc: Céréales - Gembloux (2002, February 27)

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See detailL'azote minéral du sol en 2001-2002 sous froment d'hiver
Bodson, Bernard ULg; Destain, Jean-Pierre ULg; Vancutsem, Françoise ULg et al

in Livre Blanc: Céréales - Gembloux (2002, February 27)

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See detailIn vivo cell turnover in BLV-infected sheep.
Debacq, Christophe; Asquith, B.; Kerkhofs, Pierre et al

in Société Belge de Biochimie et de Biologie moléculaire (2002, February 22)

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See detailInteracting surface of the receptor-binding domain.
GATOT, Jean-Stéphane ULg; Callebaut, Isabelle; Van Lint, Carine et al

in Société Belge de Biochimie et de Biologie moléculaire. (2002, February 22)

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See detailPlasma pregnancy-associated glycoprotein (PAG) profiles in sheep
Ledezma-Torres, R.A; Beckers, Jean-François ULg; Holtz, W

in Proceeding of the 35th Annual Meeting on Physiology and Pathology of Reproduction of the German Veterinary Medical Society (2002, February 14)

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See detailFrequency domain approaches for the identification of an experimental beam with a local nonlinearity
Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in 20th International Modal Analysis Conference, Los Angeles, 2002 (2002, February)

Two approaches for the identification of multi-degree-of-freedom non-linear systems in the frequency domain have recently been introduced, i.e., the conditioned reverse path (CRP) method and the non ... [more ▼]

Two approaches for the identification of multi-degree-of-freedom non-linear systems in the frequency domain have recently been introduced, i.e., the conditioned reverse path (CRP) method and the non-linear identification through feedback of the outputs (NIFO) method. The key idea of these methods is to eliminate the distortions caused by the presence of non-linearities in frequency response functions. In this paper, the theoretical background of the CRP and NIFO methods is briefly recalled. Then, the ability of these techniques to identify the behaviour of an experimental cantilever beam with a local geometrical non-linearity is tested. The results obtained with both methods are compared and discussed. [less ▲]

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See detailDesign of Load Shedding Schemes against Voltage Instability using Combinatorial Optimization
Van Cutsem, Thierry ULg; Moors, Cedric; Lefebvre, Daniel

(2002, January 31)

This paper proposes a methodology for the design of automatic load shedding against voltage instability. In a first step, we describe a method allowing to find the minimal shedding required in a given ... [more ▼]

This paper proposes a methodology for the design of automatic load shedding against voltage instability. In a first step, we describe a method allowing to find the minimal shedding required in a given unstable scenario. In a second step, we describe the structure of various controllers and identify the parameters to be optimized. Next, we present an optimization approach to find the controller parameters which optimize an overall performance objective. Results are presented on the Hydro-Québec system, in which load shedding is presently planned. [less ▲]

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See detailDissipative Forces and External Resonances
Jancart, Sylvie ULg; Lemaitre, Anne

in Richardson, David; Seidelmann, Kenneth; Wnuk, Edwin (Eds.) Dynamics of Natural and Artificial Celestial Bodies (2002, January 01)

Not Available

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See detailContext awareness for application sharing in teaching environment
Burger, C.; Bullinger, Eric ULg; Papakosta, S. et al

in Int. Conf. Advances in Infrastructure for e-Business, e-Education, e-Science, and e-Medicine on the Internet (SSGRR 2002w) (2002, January)

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See detailQuelle rééducation pour quelle pathologie d’épaule ?
Forthomme, Bénédicte ULg; Croisier, Jean-Louis ULg

in Actes des IVèmes Journées Interdisciplinaires de Médecine, Kinésithérapie et Podothérapie (2002, January)

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See detailEvaluation et rééducation isocinétiques de l’épaule
Croisier, Jean-Louis ULg; Forthomme, Bénédicte ULg

in Actes des IVèmes Journées Interdisciplinaires de Médecine, Kinésithérapie et Podothérapie (2002, January)

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See detailHydro-mechanical behavior of fractures: 2D, F.E.M. modeling
Guiducci, Chiara; Pellegrino, Antonio; Radu, Jean-Pol ULg et al

in Auriault, J. L.; Geindreau, C.; Royer, P. (Eds.) Poromechanics II (2002)

A numerical approach for modeling the coupled hydro-mechanical fracture behavior is proposed. The movement of fluids through rock fractures and consequently the evolution of their hydraulic conductivity ... [more ▼]

A numerical approach for modeling the coupled hydro-mechanical fracture behavior is proposed. The movement of fluids through rock fractures and consequently the evolution of their hydraulic conductivity is an important subject in many petroleum related activities, mainly concerning the change of well productivity during the reservoir life. It is well known that the flow in the fractures is strongly controlled by the fracture apertures. Recent investigations on the distribution of the apertures in natural fractures suggest that the cubic law can, better than the Darcy law, predict the fluid flux through rough walled fractures as long as the appropriate average fracture aperture is used. A finite element code is developed to predict the influence that the stresses variation in the fracture has on the distributed hydraulic conductivity field. The proposed model combines the stochastic cubic law with a non-linear deformation function (hyperbolic) that is suggested to describe the stress-closure/opening curves of the joints and that allows to couple together the hydraulic and the mechanic fracture behavior. The relationships used and the validity of the present model are tested by means of the comparison between experimental data and numerical predictions (Bart 2000) in various bound-ary and loading conditions. Comparisons between the proposed new model and a no coupled one have also been performed. They show that the proposed coupled model allows for a more realistic description of the fracture behavior. [less ▲]

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See detailQuantitative Micro-Imaging of Building Materials : from reality to dream
Pirard, Eric ULg; CSTC

in La microscopie appliquée aux matériaux de construction (2002)

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See detailLogique et limites de terroir, une perspective sociologique de la production à la consommation
Stassart, Pierre M ULg

in Actes de la journée d'étude BAMST, les produits de viande, les enjeux de la qualité (2002)

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See detailDesign and tests for the heliospheric imager of the STEREO mission
Defise, Jean-Marc ULg; Halain, Jean-Philippe ULg; Mazy, Emmanuel ULg et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2002)

The Heliospheric Imager (HI) is part of the SECCHI suite of instruments on-board the two STEREO spacecrafts to be launched in 2005. The two HI instruments will provide stereographic image pairs of solar ... [more ▼]

The Heliospheric Imager (HI) is part of the SECCHI suite of instruments on-board the two STEREO spacecrafts to be launched in 2005. The two HI instruments will provide stereographic image pairs of solar coronal plasma and coronal mass ejections (CME) over a wide field of view (~90°), ranging from 13 to 330 R[SUB]0[/SUB]. These observations compliment the 15 R[SUB]0[/SUB] field of view of the solar corona obtained by the other SECCHI instruments (2 coronagraphs and an EUV imager). The key challenge of the instrument design is the rejection of the solar disk light, with total straylight attenuation of the order of 10[SUP]-13 [/SUP]to 10[SUP]-15[/SUP]. A multi-vane diffractive baffle system has been theoretically optimized to achieve the lower requirement (10[SUP]-13[/SUP] for HI-1) and is combined with a secondary baffling system to reach the 10[SUP]-15[/SUP] rejection performance in the second camera system (HI-2). This paper presents the last updates of the SECCHI/HI design concept, with the expected performance. A verification program is currently in progress. The on-going stray-light verification tests are discussed. A set of tests has been conducted in air, and under vacuum. The results are presented and compared with the expected theoretical data. [less ▲]

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See detailThe Slowly Pulsating B Star HD 147394
Briquet, Maryline ULg; Noels-Grötsch, Arlette ULg; Aerts, C. et al

in Aerts, Conny; Bedding, Timothy R.; Christensen-Dalsgaard, Jørgen (Eds.) RADIAL AND NONRADIAL PULSATIONS AS PROBES OF STELLAR PHYSICS (2002)

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See detailLinear and nonlinear thermal instability of a rotating saturated porous medium heated from below
Desaive, Thomas ULg; Hennenberg, M.; Lebon, Georgy ULg

in 1st international conference on applications of porous media (2002)

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See detailNitrogen budget on the shelf and slope area of the Back Sabasin as inferred from modeling experiments
Grégoire, Marilaure ULg; Beckers, Jean-Marie ULg; Friederich, J. et al

in Second International Conference on "Oceanography of the Eastern Mediterranean and Black Sea: Similarities and Differences of Two Interconnected Basins" (2002)

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See detailHypercalcaemia of parathyroid carcinoma controlled by immunotherapy
Mead, G. P.; Harvey, T.; Epstein, M. et al

in The Endocrine Society's 84th Annual Meeting - Abstract book (2002)

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See detailApplication of the fast multipole method to the 2D finite element-boundary element analysis of electromechanical devices
V Sabariego, Ruth ULg; Gyselinck, J.; Geuzaine, Christophe ULg et al

in Proceedings of the 10th International Symposium on Numerical Field Calculation in Electrical Engineering (IGTE 2002) (2002)

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See detailEvolution de la texture d'un extrudat de boue au cours d'un séchage convectif
Léonard, Angélique ULg; Blacher, Silvia ULg; Crine, Michel ULg

in Compte rendu des 20èmes journées de l'AFSIA. Formulation - Mise en oeuvre - Séchage des solides fins (2002)

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See detailAcceleration of finite element analysis by parallel processing
Moto Mpong, S.; de Montleau, P.; Godinas, A. et al

in Pietrzyk, M.; Mitura, Z.; Kaczmar, J. (Eds.) Proceedings of the 5th international ESAFORM Conference on Material Forming (2002)

The finite element code LAGAMINE developed since 1982 has been adapted to numerous finite elements and constitutive laws. The present researches on micro-macro modelling increase the requirement of CPU ... [more ▼]

The finite element code LAGAMINE developed since 1982 has been adapted to numerous finite elements and constitutive laws. The present researches on micro-macro modelling increase the requirement of CPU time. The parallelization of software is often divided into two main approaches: the coarse grain approach and the fine grain approach. For Finite Element software, the coarse grain method is usually characterized by the use of the mesh partitioning. In the fine grain approach, there is no partition of the mesh. The parallel program is made by the parallelization of instructions issued of the nalysis of dependences between the instructions, and the loops. The efficiency of all these approaches depends on the organization of the memory and on the used exchange protocol (MPI, PVM, or OpenMP). Our approach is intermediate between these two main categories of parallelization. It is characterized by the parallelization of the assembly of the stiffness matrix using a coarse grain approach and the use of a parallel direct solver. Because of the architecture of the available parallel computers, which are shared memory, we decided to use OpenMP protocol. [less ▲]

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See detailHyperthyroïdie sur Amiodarone : études complémentaires, traitement et suivi de 32 cas
Valdes Socin, Hernan Gonzalo ULg; Leisteidt, S.; Betea, Daniela ULg et al

in XXème Congrès de la Société Française d'Endocrinologie - Abstract book (2002)

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See detailSituation actuelle de la qualité des sols et des eaux dans le périmètre irrgué des Doukkala (Maroc)
Rahoui, M.; Soudi, B.; Badraoui, M. et al

in Actes du séminaire de Rabat (2002)

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See detailConstitutive modeling of chalk. Application to waterflooding
Charlier, Robert ULg; Collin, Frédéric ULg; Schroeder, Christian ULg et al

in Auriault, J. L.; Geindreau, C.; Royer, P. (Eds.) Poromechanics II (2002)

Subsidence of chalk oil reservoirs in North Sea is related to the chalk compaction induced by fluid depletion and by the water – chalk interaction. A constitutive model is developed in order to take into ... [more ▼]

Subsidence of chalk oil reservoirs in North Sea is related to the chalk compaction induced by fluid depletion and by the water – chalk interaction. A constitutive model is developed in order to take into account these two effects. It is based on frictional – cap elastoplasticity and on the Barcelona unsaturated soil model. Oil – water – chalk interaction is modeled through the suction variable. In a second step, viscous effects are added to the model. After implementation into a finite element code, these tools allow to simulate a waterflooding experiment on a chalk sample. The model appears to reproduce qualitatively and quantitatively the experimental results. [less ▲]

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See detailInsert'Prof. Pour un dispositif de formation favorisant une insertion réussie dans la vie professionnelle
Beckers, Jacqueline ULg; Andrianne, Sabine; Bourguignon, Luc et al

in Actes du 2e congrès des chercheurs en éducation (2002)

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