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See detailIdentification of Nonlinear Aeroelastic Systems
Dimitriadis, Grigorios ULg; Cooper, J. E.

in Proceedings of the 1998 International Conference on Noise and Vibration Engineering (1998, September)

The successful identification of nonlinear systems could find uses in many aerospace applications including the validation of finite element models and tracking the stability of aircraft during flight ... [more ▼]

The successful identification of nonlinear systems could find uses in many aerospace applications including the validation of finite element models and tracking the stability of aircraft during flight flutter testing. The effectiveness of existing nonlinear system identification techniques is limited by various factors such as the complexity of the system under investigation and the type of nonlinearities present. In this work, a new approach is introduced that is able to identify multi degree-of-freedom systems featuring any type of nonlinear function, including discontinuous functions. The method is shown to yield accurate identifications of three different simulated aeroelastic systems containing a wide range of structural nonlinearities. [less ▲]

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See detailActions possessoires et référé
Lecocq, Pascale ULg

in Formation permanente CUP. Les procédures en référé (1998, September)

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See detailEfficient Implicit Schemes for High-Speed Dynamics and Crash Simulation. Application to shock-absorber devices
Hogge, Michel ULg; GRAILLET, D.; Ponthot, Jean-Philippe ULg

in Proceedings of «ACOMEN’98», Advanced Computational Methods in Engineering: Invited Papers (1998, September)

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See detailShort-term weather forecasting for solar buildings optimal control : an application of neural networks
Kummert, M.; Andre, Philippe ULg; Guiot, J. et al

in Proceedings Eufit'98 (1998, September)

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See detailHeating optimal control applied to a passive solar commercial building
Kummert, M.; Andre, Philippe ULg; Nicolas, Jacques ULg

in Proceedings of EuroSun'98 (1998, September)

Passive solar features can lead to significant energy savings for building heating. However the intrinsic delay between solar gains and heating demand requires an intelligent control of auxiliary HVAC ... [more ▼]

Passive solar features can lead to significant energy savings for building heating. However the intrinsic delay between solar gains and heating demand requires an intelligent control of auxiliary HVAC system to minimise the energy consumption while preventing overheating periods. This paper describes the application of discrete-time optimal control to auxiliary heating of a passive solar commercial building. Simulation-based results using complex reference models are presented and discussed. The optimal controller is compared to classical "heatingcurve + Thermostatic valve" control. It is shown that optimal control can lead to substantial improvement of thermal comfort and energy consumption. [less ▲]

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See detailDisplacements of Structures
Samyn, Philippe; Latteur, Pierre ULg

(1998, September)

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See detailVolume of Structures : Application to Classical and Harmonic Structures
Samyn, Philippe; Latteur, Pierre ULg; Van Vooren, J.

(1998, September)

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See detailEffective Iterative Solvers for Highly Non-Linear & Large Deformation Pressure Dependent Problems
Boman, Romain ULg; Colantonio, Laurent; Ponthot, Jean-Philippe ULg

in Van Keer, R.; Verhegghe, B.; Hogge, M. (Eds.) et al Proceedings of ACOMEN'98, Advanced Computational Methods in Engineering, part 2: Contributed papers (1998, September)

In this paper, we present a stress update scheme for non-deviatoric elastoviscoplastic models, which can be considered as an extension of the radial return method for classical plasticity. We use the ... [more ▼]

In this paper, we present a stress update scheme for non-deviatoric elastoviscoplastic models, which can be considered as an extension of the radial return method for classical plasticity. We use the unconditionally stable backward Euler scheme to obtain the viscoplastic solution at each increment. To solve the large sparse non symmetric iteration matrix, we use the GMRES method. This fast iterative solver, in conjunction with an appropriate preconditioner, can save a lot a memory and CPU time when 3D problem are considered. A comparison between direct and iterative solvers will be discussed on two applications of cold compaction of powders. [less ▲]

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See detailReliable Approximation Schemes for Composite Structures Optimization"
Bruyneel, Michaël ULg; Vermaut, O.; Fleury, Claude ULg

in Van Keer, R.; Verhegghe, B.; Hogge, M. (Eds.) et al ACOMEN ’98 : an international conference on advanced computational methods in engineering : Ghent, 2-4 september 1998 (1998, September)

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See detailA study of vibrato : assessment by panel of judges compared to spectral analysis.
Morsomme, Dominique ULg

in XXIVth World Congress of the International Association of logopedics & Phoniatrics (IALP) (1998, August)

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See detailData networks integration
De Praetere, Julien; Maricau, Pḧilippe; Van Droogenbroeck, Marc ULg

in 37th European Telecommunications Congress, Volume 17 (1998, August)

This paper discusses the role of data networks integration on an asynchronous transfer mode (ATM) core and compares the advantages achieved by the usage of ATM with those given by emerging technologies ... [more ▼]

This paper discusses the role of data networks integration on an asynchronous transfer mode (ATM) core and compares the advantages achieved by the usage of ATM with those given by emerging technologies such Internet protocol (IP) over synchronous digital hierarchy (SDH) (giga-routers). [less ▲]

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See detailVoltage security assessment of systems with multiple instability modes
Sermanson, Vincent; Moisse, Christel; Van Cutsem, Thierry ULg et al

in Proc. 4th Intern. Workshop on Bulk power systems dynamics and control (Restructuring) (1998, August)

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See detailAerosol deposition in the horse lung
Votion, Dominique ULg

in In Proceedings (CD-ROM): World Equine Airways Symposium (WEAS) (1998, August)

This paper will focuse on the technique to study aerosol deposition in the respiratory system (gamma-scintigraphy), review the studies performed in horses and suggest potential applications of nuclear ... [more ▼]

This paper will focuse on the technique to study aerosol deposition in the respiratory system (gamma-scintigraphy), review the studies performed in horses and suggest potential applications of nuclear scintigraphy to improve inhalation therapy in this species. [less ▲]

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See detailProcess Integration Techniques in the Development of New Energy Technologies : Application to the Isothermal Gas Turbine
Dumont, Marie-Noëlle ULg; Marechal, Francois; Kalitventzeff, Boris ULg

(1998, August)

Cogeneration is one of the key technologies for CO2 reduction in the process industry. A good integration of the cogeneration system and the process is necessary to obtain the maximum energy saving. This ... [more ▼]

Cogeneration is one of the key technologies for CO2 reduction in the process industry. A good integration of the cogeneration system and the process is necessary to obtain the maximum energy saving. This requires the possibility of adapting the design parameters of the cogeneration system to better suit the process requirements. The isothermal gas turbine is a new concept combining partial oxidation and staged combustion inside a gas turbine to reach electrical efficiencies as high as 58%. The use of steam in the catalytic burner allows to expand steam directly in the gas turbine in such a way that the mechanical power production is increased. The flue gases composition and temperature are therefore modified. New flow sheets for combined cycles will be presented as well as their adaptation to different steam to carbon ratios. When using isothermal gas turbine as a cogeneration system, the steam flowrate allows adapting the flue gases of the turbine in order to match at best the process requirements. The conceptual design of the isothermal gas turbine integration has been performed using the « Effect Modeling and Optimization » concept that is based on process integration techniques. This serves as a first step to identify the major flow rates to be considered for the technology. The final configuration of the integrated technology has been evaluated afterwards using process simulation. [less ▲]

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See detailTransient stability-constrained generation rescheduling
Ruiz-Vega, Daniel; Bettiol, Arlan; Ernst, Damien ULg et al

in Proceedings of 1998 IREP Symposium - Bulk Power System Dynamics and Control - IV (1998, August)

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See detailImpact of cell discard strategies on TCP/IP in ATM UBR networks
Rosolen, Vincent; Bonaventure, Olivier; Leduc, Guy ULg

in Performance Modelling and Evaluation of ATM Networks (1998, July)

In ATM UBR networks supporting TCP traffic, optimal efficiency can only be envisaged if switches adopt a discard mechanism that operates at the packet level rather than the cell level. In this paper, we ... [more ▼]

In ATM UBR networks supporting TCP traffic, optimal efficiency can only be envisaged if switches adopt a discard mechanism that operates at the packet level rather than the cell level. In this paper, we investigate the performance of the EPD, RED and FBA strategies by means of simulation, and give comparative results with respect to different environments and performance criteria. We show that implementing such a strategy in a LAN brings little added value, while the benefit is more obvious in a WAN access network with asymmetrical bandwidths. Specifically, the improvement not only concerns goodput but also fairness among competing TCP connections, and depends upon the Maximum Segment Size used by the sources. [less ▲]

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See detailThe diet of the European mink (Mustela lutreola) in south west France. First results.
Libois, Roland ULg; Fellous, Amina; Rosoux, René et al

in Reig, S. (Ed.) Abstracts of the Euro American mammal congress (1998, July)

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See detailTYPOLOGIE DE L’OCCUPATION DU SOL ET GENERATION DE MOBILITE
Hanocq, Philippe ULg

in Collectif (Ed.) Proceedings of the 8th World Conference on Transport Research (1998, July)

The paper attempts to describe the main typologies of the urbanization in Belgium, their evolution and their incidence on the everyday mobility of persons. The comparison between the systems of land use ... [more ▼]

The paper attempts to describe the main typologies of the urbanization in Belgium, their evolution and their incidence on the everyday mobility of persons. The comparison between the systems of land use allows to approach, through concrete cases, one of the fundamental aspects of the relationship "development - mobility", namely the impact of the compactness (density) of an urban system on the generation of mobility. Furthermore, this paper tries to confirm / infirm the validity of certain assumptions describing the future supply and demand in the areas of urbanization and communication, taking account of current observed patterns : a tendency to extend the isotropic urbanization and a steady and diversified growth of the car oriented mobility. [less ▲]

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See detailAnalysis of Double-Skinned Cylindrical Structures by the Stiffened Panel Method
Rigo, Philippe ULg; Wang, H.

in Offshore Mechanics and Artic Engineering, OMAE’98-0420, Pub. ASME (1998, July)

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See detailIsokinetic evaluation of hamstring muscle strain: interest of the eccentric mode
Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg

in Proceedings of the Third Annual Congress of the European College of Sport Science (1998, July)

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See detailOn the genetic structure of the Iberian wood mouse (Apodemus sylvaticus) populations. An analyse of mtDNA restriction patterns
Michaux, J; Libois, Roland ULg; Ramalhinho, Maria da Graça et al

in Reig, S. (Ed.) Abstracts of the Euro American mammal congress (1998, July)

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See detailOrbits of Hipparcos metal-poor stars with well-defined spectroscopic abundances.
Bancken, F.; Jehin, Emmanuel ULg; Ferraz-Mello, S.

in Impact of Modern Dynamics in Astronomy (1998, July)

We investigate the orbits of metal-poor stars in a modified Ostriker and Caldwell Galactic mass model. These stars have well-determined spectroscopic abundances and our objective is to search for a ... [more ▼]

We investigate the orbits of metal-poor stars in a modified Ostriker and Caldwell Galactic mass model. These stars have well-determined spectroscopic abundances and our objective is to search for a relationship between these abundances and the characteristics of orbits such as excentricity, chaoticity... [less ▲]

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See detailLa vision artificielle et la qualité externe des produits agricoles et agro-alimentaires
Leemans, Vincent ULg; Destain, Marie-France ULg

in Application de systèmes optoélectroniques pour le contrôle en ligne des produits agroalimentaires (1998, June 03)

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See detailComparisons of anisotropic elastoplastic laws applied to steel sheet
Habraken, Anne ULg; Radu, Jean-Pol ULg; Duchene, Laurent ULg et al

in International Conference NUMIFORM 1998 (1998, June)

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See detailLow-energy social housings Marchin (BE): A case study revisited
Desmecht, James; Dupagne, Albert ULg; Hauglustaine, Jean-Marie ULg et al

in Maldonado, Eduardo; Yannas, Simos (Eds.) Environmentally Friendly Cities (1998, June)

In, 1997, the LEMA research team revisited 20 house settlement of Marchin. It was to assess the houses performances 15 years after their construction, and check the possible interactions between "energy ... [more ▼]

In, 1997, the LEMA research team revisited 20 house settlement of Marchin. It was to assess the houses performances 15 years after their construction, and check the possible interactions between "energy-conscious design" and social factors. This paper briefly exposes the results of this recent reassessment, in the light of the project requirements, design options and design methodology. It indicates that careful design may guarantee, for quite long periods of time, both robustness and affordability of "energy-conscious" housings. [less ▲]

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See detailNumerical Modeling of Tribological Devices Using Various Contact Algorithms
CHABRAND, P.; DUBOIS, F.; GRAILLET, D. et al

in Proceedings of “NUMIFORM’98, Simulation of Materials Processing: Theory, Methods and Applications (1998, June)

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See detailEuropean evaluation practices and tools in open and distance educationProceedings of EDEN conference
Detroz, Pascal ULg; Denis, Brigitte ULg; Piria, Luca et al

in EDEN conference proceedings. Universities in a Digital Era — Transformation, Innovation and Tradition — Roles and Perspectives of Open and Distance Learning (1998, June)

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See detailAnalysis and Prediction of Instability Behaviour in Non-Linear Aeroelastic Systems
Dimitriadis, Grigorios ULg; Cooper, J. E.

in Tagungsband Aeroelastik-Tagung der DGLR (1998, June)

The effect of non-linearities, be they structural, aerodynamic or control, on the aeroelastic behaviour of aircraft is becoming of increasing importance in the Aerospace industry. As well as the ... [more ▼]

The effect of non-linearities, be they structural, aerodynamic or control, on the aeroelastic behaviour of aircraft is becoming of increasing importance in the Aerospace industry. As well as the prediction of °utter instabilities, there is a need for the prediction and modelling of the onset of Limit Cycle Oscillations (LCO). A thorough understanding of the possible types of aeroelastic phenomena that can occur due to non-linearities in the system is required before attempting to predict the behaviour. In this paper, the onset and suppression of LCOs is investigated by means of an examination of the stability and energy content of limit cycles. [less ▲]

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See detailParameter Identification of Material Models using the "GCMMA" method
KLEINERMANN, J. P.; Ponthot, Jean-Philippe ULg

in Proceedings of "NUMIFORM'98, Simulation of Materials Processing: Theory, Methods and Applications (1998, June)

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See detailAn Efficient Implicit Scheme for the Treatment of Contact between Deformable Bodies
GRAILLET, D.; Ponthot, Jean-Philippe ULg

in . Proceedings of "NUMIFORM'98, Simulation of Materials Processing: Theory, Methods and Applications (1998, June)

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See detailApplication of a three-dimensional inverse method to the design of a centrifugal compressor impeller
Demeulenaere, Alain; Léonard, Olivier ULg; Van den Braembussche, Rene

in Proceedings of the ASME Turbo Expo 1998 (1998, June)

ASME Paper 98-GT-127

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See detailIterative Solvers for Large Pressure Dependent Problems
Boman, Romain ULg; Colantonio, Laurent; Ponthot, Jean-Philippe ULg

in Huétink, J.; Baaijens, F. P. T. (Eds.) Proceedings of the Sixth International Conference on Numerical Methods in Industrial Forming Processes (1998, June)

In this paper, we present a stress update scheme for non-deviatoric elastoviscoplastic models, which can be considered as an extension of the radial return method for classical plasticity. We use the ... [more ▼]

In this paper, we present a stress update scheme for non-deviatoric elastoviscoplastic models, which can be considered as an extension of the radial return method for classical plasticity. We use the unconditionally stable backward Euler scheme to obtain the viscoplastic solution at each increment. To solve the large sparse non symmetric iteration matrix, we use the GMRES method. This fast iterative solver, in conjunction with an appropriate preconditioner, can save a lot a memory and CPU time when 3D problem are considered. A comparison between direct and iterative solvers will be discussed on two applications of cold compaction of powders. [less ▲]

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See detailPregnancy-associated glycoproteins in the ruminants: inactive members of the Aspartic Protease family
Beckers, Jean-François ULg; Drion, Pierre ULg; Garbayo, J. M. et al

in Proceedings of the Middel European Buiatrics Congress, 1998 (1998, May 21)

Proteins secreted by the placenta, when detected in the peripheral circulation of the mother, can be useful indicators of both pregnancy and feto-trophoblast well-being (1-3). In 1982, Butler et al. (4 ... [more ▼]

Proteins secreted by the placenta, when detected in the peripheral circulation of the mother, can be useful indicators of both pregnancy and feto-trophoblast well-being (1-3). In 1982, Butler et al. (4) isolated two pregnancy-specific proteins (PSPA and PSPB) from bovine placental membranes. PSPA was identified as a-fetoprotein which is not strictly limited to pregnancy, while PSPB was confirmed as placenta’s and pregnancy’s specific (5). PSPB was characterized as a glycoprotein showing relative molecular masses (Mr) between 47 and 53 kDa and presenting different isoelectric points (from 4.0 to 4.4). The Mr of PSPB was similar to the Mr of the molecule isolated by Laster in 1977 (6). In 1991, Zoli et al. (7) purified a pregnancy-associated glycoprotein (PAG), later designated PAG_1 and presently designated as PAG_I_ 67 considering its Mr. When isolated from bovine fetal cotyledons PAG_I_67 was an acidic glycoprotein of 67 kDA. Four isoforms (PI : 4.4, 4.6, 5.2 and 5.4) were detected in the initial preparation. Later molecular cloning studies showed that the PSPB and PAG_I_67 were closely related in primary structure (8). These glycoproteins (either PSPB and PAG_I_67) could be detected in the maternal circulation at around the time that the trophoblast formed definitive attachment to the uterine wall (figures A & B). Concentrations increased gradually therefore and reached peak values just before parturition at about 1 to 5 mg/ml (9).The PSPB and PAG molecules are routinely determined in peripheral maternal blood as pregnancy markers in cattle (5, 9,10). Glycoproteins immunologically related to PAG_I_67 and PSPB have been isolated and partially characterized from ovine fetal cotyledons: oPAG later designated oPAG_I (11) and oPSPB (12). They also have been detected in maternal blood by week third (12) or fourth (13) after breeding. Different forms (differing in Mr and isoelectric point) were characterized after isolation from sheep cotyledons cultured in vitro (14). Very recently, 3 different PAGs were characterized from goat placenta having Mr of 55, 59 and 62 kDa. Each of them presented various isoeletric points (15). In 1991, Xie et al., cloned PAG (now known as PAG_I_67) from late bovine and ovine placenta by screening cDNA libraries with two anti-PAG antisera (16). The bovine and ovine cDNAs encoding PAG_I shared 86% nucleotide sequence identic with one and other and encoded proteins of 380 and 382 aminoacids respectively including a 15 aminoacid signal sequence. However, protein sequence data, (peptidic sequencing) already showed the first aminoacid of the bovine PAG_I_67 was an arginine that corresponded to another one located at position 39, downstream of the side of signal sequence cleavage, indicating that PAG_I_67 undergoes post-translational modifications from a proform. [less ▲]

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See detailEtude clinique et anatomopathologique de l’infection expérimentale de lapins E.O.P.S. par 5 souches virales amyxomateuses
Marlier, Didier ULg; Cassart, Dominique ULg; Boucraut-Baralon, Corinne et al

in Proceedings of the 7èmes Journées de la Recherche Cunicole (1998, May 13)

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See detailValidation d'une épreuve isocinétique de résistance à la fatigue musculaire
Croisier, Jean-Louis ULg; Lhermerout, Claude ULg; Crielaard, Jean-Michel ULg

in Actes de la réunion annuelle de la Société Belge de la Médecine et des Sciences du Sport (1998, May)

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See detailCas clinique : rupture du tendon du jambier antérieur
Billen, F.; Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg

in Actes de la Réunion Annuelle de la Société Belge de la Médecine et des Sciences du Sport (1998, May)

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See detailEffets de la répétition des traitements Progestagènes/PMSG chez la chèvre
Baril, G.; Leboeuf, B.; Remy, Benoit et al

(1998, April 30)

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See detailObjective criteria for the prognosis and therapeutical selection during acutre respiratory disorders
Coghe, Joost; Lekeux, Pierre ULg

in Libro de ponencias y comunicaciones (1998, April 29)

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See detailLa généalogie de Tydée et de Diomède
Renaud, Jean-Michel ULg

in Auger, Danièle; Saïd, Suzanne (Eds.) Généalogies mythiques. Actes du VIIIe Colloque international du Centre de Recherches Mythologiques de l'Université de Paris-X (Chantilly, 14-16 septembre 1995) (1998, April)

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See detailA Combined for Element-Free Galerkin Method/Arbitrary Lagrangian Eulerian Formulation for Dynamic Crack Propagation
Ponthot, Jean-Philippe ULg; BELYTSCHKO, T.

in Durban, D.; Pearson, J. R. A. (Eds.) Proceedings of the "IUTAM Symposium on Non-Linear Singularities in Deformation and Flow (1998, March)

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See detailInformations sur les fongicides à base de strobilurines
Meeùs, Patrick; Bodson, Bernard ULg

in Fumure et protection phytosanitaire des céréales (1998, February 27)

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See detailLa diminution des intrants dans la production des céréales
Roisin, Christian; Goffart, Jean-Pierre; Frankinet, Marc et al

in Fumure et protection phytosanitaire des céréales (1998, February 27)

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See detailHeavy elements abundances in metal-poor stars
Magain, Pierre ULg; Jehin, Emmanuel ULg; Neuforge, Corinne et al

in American Institute of Physics Conference Series (1998, February 01)

A sample of 21 metal-poor stars have been analysed on the basis of high resolution and high signal-to-noise spectra. Correlations between relative abundances of 16 elements have been studied, with a ... [more ▼]

A sample of 21 metal-poor stars have been analysed on the basis of high resolution and high signal-to-noise spectra. Correlations between relative abundances of 16 elements have been studied, with a special emphasis on the neutron-capture ones. This analysis reveals the existence of two sub-populations of field halo stars, namely Pop IIa and Pop IIb. They differ by the behaviour of the s-process elements versus the alpha and r-process elements. We suggest a scenario of formation of these stars, which closely relates the field halo stars to the evolution of globular clusters. The two sub-populations would have evaporated the clusters during two different stages of their chemical evolution. [less ▲]

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See detailContrôle de qualité des formulations de pesticides
Schiffers, Bruno ULg; Deuse, J.

in Dossier - Conférence de la CORAF/ICS/SENCHIM : L'utilisation des intrants en cultures cotonnière et maraîchères (1998, February)

Les traitements phytosanitaires consistent généralement à déposer des quantités de matière(s) active(s), de manière aussi uniforme que possible sur la cible à protéger, et ceci quelle que soit sa nature ... [more ▼]

Les traitements phytosanitaires consistent généralement à déposer des quantités de matière(s) active(s), de manière aussi uniforme que possible sur la cible à protéger, et ceci quelle que soit sa nature (cultures, arbres, bois d'oeuvre, etc...). Mais lorsqu'une matière active technique est produite dans une usine de synthèse chimque, elle est rarement utilisable telle quelle. [less ▲]

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See detailFumure azotée des céréales: L'azote minéral du sol en 1997-1998: conseil de fumure pour 1998
Frankinet, Marc; Goffart, Jean-Pierre; Destain, Jean-Pierre ULg et al

in Fumure et protection phytosanitaire des céréales (1998, February)

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See detailStratégies de lutte intégrée en régions chaudes : une revue des projets actuels de formation aux Philippines et en Indonésie
Wynn, N.R.; Schiffers, Bruno ULg; Seghers, N. et al

in Dossier Conférence de la CORAF/ICS/SENCHIM : L'utilisation des intrants en cultures cotonnière et maraîchères (1998, February)

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See detailEffets de la Deltamethrine et d'une solution d'extrait de graines de "Neem" sur les populations de Plutella xylostella (L.) (Lep.: Yponomeutidae) et de Cotesia plutellae (Hym.:Braconidae) dans la zone périurbaine de Cotonou au Bénin
Goudegnon, A.E.; Kirk, A.A.; Schiffers, Bruno ULg et al

in Dossier : L'utilisation des intrants en cultures cotonnière et maraîchères (1998, February)

Une comparaison entre des applications de deltaméthrine et une solution d'extrait d'amande de Neem a été effectuée dans la zone péri urbaine de Cotonou, sur des populations de Plutella xylostella (L ... [more ▼]

Une comparaison entre des applications de deltaméthrine et une solution d'extrait d'amande de Neem a été effectuée dans la zone péri urbaine de Cotonou, sur des populations de Plutella xylostella (L.). Sur les parcelles traitées à la deltaméthrine, on observe des populations du oraageur dix fois supérieures à celles présentes sur les parcelles traitées au Neem. Le nombre de choux commercialisables issus des parcelles traitées au Neem est 1.5 fois supérieur à celui produit par celles traitées avec le pyréthrinoïde. L'influence de ces applications a également été observée sur les populations de Cotesia plutellae (Kurdjumov), unique parasitoïde de la Teigne. Il semble que ces populations ne soient ni génées par les applications d'extrait de Neem, ni par celles de deltaméthrine. [less ▲]

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See detailTravail isocinétique excentrique
Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg

in Abstract Book du Symposium de l'ULB : "Mise au point en Traumatologie du Sport « Les enthésopathies » " (1998, February)

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See detailHarmonic Trusses : the Search for Minimum Weight
Samyn, Philippe; Latteur, Pierre ULg

(1998, February)

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See detailISSD : An Interactive Software for Structural Design
Latteur, Pierre ULg; Lejeune, Marc

(1998, February)

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See detailApplication of neural networks in quality control of 'Jonagold' apples
Leemans, Vincent ULg; Bieuvelet, Frédéric; Destain, Marie-France ULg

in Bellon-Maurel, Véronique (Ed.) Sensoral 98 - International workshop on sensing quality of agricultural products (1998, February)

This paper studies the possibilities to grade the 'Jonagold', a bicolour apple, using neural networks and Fisher"s linear discriminant analysis. In a first step the pixels are sorted into three areas, the ... [more ▼]

This paper studies the possibilities to grade the 'Jonagold', a bicolour apple, using neural networks and Fisher"s linear discriminant analysis. In a first step the pixels are sorted into three areas, the blush colour area, the intermediate colour area and the ground colour area; the accuracy reached 95% with the neural networks. Int the second step the fruit are graded into four categories on their ground colour basis; the accuracy reached 68%whatever the method used. It si also shown that there is no need to separate the ground colour and the intermediate colour to compute the ground colour classification parameters. [less ▲]

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See detailNormes pour la rédaction et l'évaluation des appels d'offres : cas du Rwanda
Deuse, J.; Schiffers, Bruno ULg

in Dossier : Conférence de la CORAF/ICS/SENCHIM : L'utilisation des intrants en cultures cotonnière et maraîchères (1998, January)

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See detailDeveloppement d'une méthodologie destinée à mesurer les réactions de peur chez le cheval. Application à l'étude de l'influence de différents facteurs.
Vierin, M.; Bouissou, M. F.; Vandenheede, Marc ULg et al

in Compte rendu de la 24ème Journée de la Recherche Equine (1998)

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See detailSensitivity of the Black Sea's ecosystem to physical processes. First results of a high resolution 3D interdisciplinary model
Grégoire, Marilaure ULg; Beckers, Jean-Marie ULg; Nihoul, Jacques ULg et al

in Supplement to EOS Transactions - American Geophysical Union meeting du 9 au 13 février 1998 (1998)

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See detailA photometric method to study the Wolf-Rayet content of compact H II regions in nearby galaxies
Royer, P.; Vreux, Jean-Marie ULg; Manfroid, Jean ULg

in The Magellanic Clouds and Other Dwarf Galaxies (1998)

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See detailRelaxed Assumptions for Iteration Methods
Brohé, Myrana; Tossings, Patricia ULg

in Nguyen, Van Hien; Strodiot, Jean-Jacques; Tossings, Patricia (Eds.) OPTIMIZATION (V.H. Nguyen - J.J. Strodiot - P. Tossings Editors), Proceedings BFG, Namur (1998)

We consider a general inexact interative method for finding a fixed point of a nonexpansive mapping on a real Hilbert space. Proofs of convergence of sequences generated by such a method generally require ... [more ▼]

We consider a general inexact interative method for finding a fixed point of a nonexpansive mapping on a real Hilbert space. Proofs of convergence of sequences generated by such a method generally require at least that the error term goes to zero. The aim of the present paper is to weaken this nonrealistic theoretical assumption. The obtained result is applied to the proximal point algorithm. [less ▲]

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See detailTreatment of Opacities in Stellar Modeling and Asteroseismology
Neuforge-Verheecke, Corinne; Noels-Grötsch, Arlette ULg; Guzik, Joyce A

in Bradley, Paul A.; Guzik, Joyce A. (Eds.) A Half Century of Stellar Pulsation Interpretation: A Tribute to Arthur N. Cox: Proceedings of a Conference held in Los Alamos, NM 16-20 June 1997 (1998)

We have tested the effect of the new generation of OPAL opacities as well as a more sophisticated way of interpolating in the opacity data. New calibrated models have been computed for the binary system ... [more ▼]

We have tested the effect of the new generation of OPAL opacities as well as a more sophisticated way of interpolating in the opacity data. New calibrated models have been computed for the binary system Alpha Centauri. Constraints given by asteroseismology are discussed. [less ▲]

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See detailEffects of the interaction between habitat properties and disturbance characteristics on the interior/edge ratio.
Bogaert, Jan ULg; Verbeeck, A; Impens, I

in Farina, A (Ed.) Proceedings of the VII International Congress of Ecology (1998)

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See detailStability Problems and Linear Driving
Noels-Grötsch, Arlette ULg; Guzik, Joyce A

in Bradley, Paul A.; Guzik, Joyce A. (Eds.) A Half Century of Stellar Pulsation Interpretation: A Tribute to Arthur N. Cox, edited by Paul A. Bradley and Joyce A. Guzik, Proceedings of a Conference held in Los Alamos, NM 16-20 June 1997 (1998)

Much progress has been made through this half century in the search of driving mechanisms and selection of modes. After a short historical account tracing the steps already taken in the early days of ... [more ▼]

Much progress has been made through this half century in the search of driving mechanisms and selection of modes. After a short historical account tracing the steps already taken in the early days of stellar stability, quasi-adiabatic and non adiabatic oscillations are described with an emphasis on the physical meaning of the stability coefficient. A simplified picture is presented for the major driving mechanisms. Applications for the major classes of variables stars are reviewed with the problems encountered during this half century and some of the various remedies that have been proposed. At each step, a special care is given to Art CoxUs important contributions. [less ▲]

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See detailVisualizing dynamic power system scenarios for data mining
Geurts, Pierre ULg; Wehenkel, Louis ULg

in Proceedings of LESCOPE 98, Large Engineering Syst. Conf. on Power Engineering (1998)

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See detailThe 3nu3 bands of isotopic ozone 668 and 686
Chichery, A.; Barbe, Alain; Bourgeois, M.T. et al

in Atmospheric Spectroscopy Applications 1999 - Proceedings (1998)

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See detailEarly prediction of electric power system blackouts by temporal machine learning
Geurts, Pierre ULg; Wehenkel, Louis ULg

in Proceedings of ICML-AAAI 98 Workshop on "Predicting the future: AI approaches to time series analysis" (1998)

This paper discusses the application of machine learning to the design of power system blackout prediction criteria, using a large database of random power system scenarios generated by Monte-Carlo ... [more ▼]

This paper discusses the application of machine learning to the design of power system blackout prediction criteria, using a large database of random power system scenarios generated by Monte-Carlo simulation. Each scenario is described by temporal variables and sequences of events describing the dynamics of the system as it might be observed from real-time measurements. The aime is to exploit the data base in order to derive as simple as possible rules which would allow to detect an incipient blackout early enough to prevent or mitigate it. We propose a novel "temporal tree induction" algorithm in order to exploit temporal attributes and reach a compromise between the degree of anticipation and selectivity of detection rules. Tests are carried out on a a data base related to voltage collapse of an existing large scale power system. [less ▲]

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See detailParametric definition of sandblasted and polished concrete surfaces
Courard, Luc ULg

in Sandrolini, Franco (Ed.) ICPIC 98 (1998)

A lot of considerations have been developed on the influence of surface roughness on the adherence of a repairing systems on a concrete support : sandblasting, hammering, hydroblasting, acid attacks,… ... [more ▼]

A lot of considerations have been developed on the influence of surface roughness on the adherence of a repairing systems on a concrete support : sandblasting, hammering, hydroblasting, acid attacks,… have been analysed by a lot of authors. This presentation gives a parametric interpretation of a sandblasted surface in comparison with a polished concrete. A stylus is walked along the surface to be analysed and the profile is continuously registered. The filtration of the electric signal is realised in order to separate waviness and roughness. The effect of the stylus/component profile contact on the validity of the measurement results is of prime importance. Profilometry and surfometry are mathematically described by statistical and amplitude parameters. The analysis of surfometry profiles let us to observe and quantify the shape regularity and the isotropic effect of sandblasting. The bearing ratio curves permit to quantify the volume of voids able to absorb the slurry or the repairing mortar applied on the support. The difference, between the two surface treatments is clearly quantified and related to adherence properties of some hydraulic binders. [less ▲]

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See detailNew developments in quantitative analysis and trace analysis in pharmaceutical matrices by FTIR
Otte, Xavier; Duvivier, France; Evrard, Brigitte ULg et al

in Proceedings de la journée de rencontre des jeunes chimistes mars 1998 (1998)

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See detailA simple adaptive observer for nonlinear systems
Bullinger, Eric ULg; Ilchmann, Achim; Allgöwer, Frank

in IFAC Nonlinear Control Systems Design, NOLCOS98 (1998)

We present a high-gain observer for nonlinear uniformly observable SISO systems for which the high-gain parameter is determined adaptively online. The adaptation scheme is simple and universal in the ... [more ▼]

We present a high-gain observer for nonlinear uniformly observable SISO systems for which the high-gain parameter is determined adaptively online. The adaptation scheme is simple and universal in the sense that it is independent of the system the observer is designed for. Unlike in an earlier approach, the gain is adapted continuously in the present paper. This further simplifies the adaptation law and also leads to lower values of the high-gain parameter. We prove that the observer output error becomes smaller than a user specified bound for large times and that the adaptation converges. The observer is applied to a generic bioreactor [less ▲]

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See detailRadial Return Extension for the Numerical Simulation of Viscoplastic Processes
Ponthot, Jean-Philippe ULg

in Proceedings of “NUMIFORM'98, Simulation of Materials Processing: Theory, Methods and Applications (1998)

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See detailCovalent liquids: tight binding simulation versus experimental results
Gaspard, Jean-Pierre ULg; Bichara, C.; Raty, Jean-Yves ULg et al

(1998)

We show that a simple tight binding model with a repulsive potential describes the Peierls distortions in covalent systems and the well-known octet rule. The existence and the intensity of the Peierls ... [more ▼]

We show that a simple tight binding model with a repulsive potential describes the Peierls distortions in covalent systems and the well-known octet rule. The existence and the intensity of the Peierls distortion is mainly related to the hardness of the repulsive potential as demonstrated both by theoretical calculations and by the experimental systematic analysis of liquid structures. In particular, As is threefold coordinated and Sb is sixfold coordinated in the liquid; the qualitative difference is explained by the ratio of the distortion energy DeltaE to the thermal energy k BT. The As xSb 1-x alloys show continuously varying average coordination numbers showing that the semiconductor-metal transition is continuous with concentration. In addition, we illustrate in the case of liquid Se that, tight binding Monte Carlo simulations are able to describe quantitatively the structure of liquid elements provided the Van der Waals potential is added [less ▲]

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See detailThéorie et typographie : une synthèse des règles typographiques de la ponctuation
Purnelle, Gérald ULg

in Tilkin, Françoise; Defays, Jean-Marc; Rosier, Laurence (Eds.) « À qui appartient la ponctuation ? », Actes du colloque international et interdisciplinaire de Liège (13–15 mars 1997) (1998)

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See detailStranding in Belgium
Jauniaux, Thierry ULg; Coignoul, Freddy ULg

in meeting report (1998)

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See detailLes compétences métacognitives et la résolution des problèmes chez des adolescents de l'enseignement secondaire spécial de forme trois : étude exploratoire
Beckers, Jacqueline ULg; Puissant, Fanny

in Depover, Christian; Noël, Bernadette (Eds.) Approches plurielles de l'évaluation des compétences et des processus cognitifs : Actes du 12e colloque de l'ADMEE 1998, Université de Mons-Hainaut (1998)

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See detailThermo-hydro-mechanical coupling in clay barriers
Collin, Frédéric ULg; Li, Xiang Ling; Charlier, Robert ULg et al

in Thimus, Jean-Francois; Abousleiman, Y.; Cheng, A. H. D. (Eds.) et al Poromechanics. A tribute to Maurice A. Biot (1998)

A complete thermo-hydro-mechanical model is presented to treat the complex coupling problems in the clay barrier. The formulation related to the heat transfer, moisture transfer (liquid water and water ... [more ▼]

A complete thermo-hydro-mechanical model is presented to treat the complex coupling problems in the clay barrier. The formulation related to the heat transfer, moisture transfer (liquid water and water vapour), air transfer in a deformable unsaturated soil is given. The formulation of the Alonso-Gens’s mechanical model for unsaturated soil is also incorporated. Finally, a small scale wetting – heating test on compacted bentonite is performed as a validation test. The numerical results are compared with respect to the experimental measurements. [less ▲]

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See detailQuantitative bacterial cultures and microscopic examination of bronchoalveolar lavage specimens in the diagnosis of lower respiratory disease in dogs and cats.
Peeters, Dominique ULg; McKiernan, B.; Weisiger, R. et al

in Proceedings of the 8th Annual Congress of the ESVIM (1998)

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See detailThermo-hydro-mechanical coupling in clay barriers
Li, Xian Ling; Collin, Frédéric ULg; Radu, Jean-Pol ULg et al

in Evangelista, Aldo; Picarelli, Luciano (Eds.) The Geotechnics of Hard soils, Soft Rocks (1998)

A complete thermo-hydro-mechanical model is presented to tackle the complex coupling problems encountered in clay barriers. A detailed formulation coupling the heat, moisture (liquid water and water ... [more ▼]

A complete thermo-hydro-mechanical model is presented to tackle the complex coupling problems encountered in clay barriers. A detailed formulation coupling the heat, moisture (liquid water and water vapour) and, air transfer in a deformable unsaturated soil is given. The formulation of the Alonso-Gens’s mechanical model for unsaturated soil is also incorporated. The sensitivity to some parameters and their determinations are analysed. Finally, a small scale wetting – heating test on compacted bentonite is performed for validation; the numerical results are compared to the experimental measurements. [less ▲]

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See detailOralité et comicité
Defays, Jean-Marc ULg

in Actes du XXI Congrès international de linguistique et de philologie romanes (1998)

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See detailImpact of different environmental managements on spatial distribution of ventilation in COPD horses
Vandenput, Sandrina ULg; Rollin, Frédéric ULg; Votion, Dominique ULg et al

in Plügers Archives European Journal of Physiology (1998)

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See detailPotentiels d'application de deux souches de levures vis-à-vis des maladies de conservations des pommes
Jijakli, Haissam ULg; Grevesse, cathy; Lepoivre, Philippe ULg

in 1er colloque transnational sur les luttes biologique, integree, et raisonnee, le 21,22 et 23 janvier 1998 (1998)

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See detailFinancing sources for village agents of the rice channel in the Mekong Region
Dogot, Thomas ULg; Lebailly, Philippe ULg

in BADC; Vietnam Women's Union (Eds.) Proceedings of the Workshop "Projects with a credit component in South-East Asia" (1998)

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See detail3D flow and transport groundwater modelling including river interactions
Carabin, Guy; Dassargues, Alain ULg; Brouyère, Serge ULg

in Burganos, V. N.; Karatzas, G. P.; Payatakes, A. C. (Eds.) et al Computational Methods in Water Resources XII, Vol. 1: Computational Methods in Contamination and Remediation of Water Resources (1998)

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See detailGround-based FTIR Measurements from a Series of European sites during the Winter of 1995/96 and a Comparison with a 3D Chemical Transport Model: Evidence of Chlorine Activation and Ozone depletion
Paton Walsh, C.; Bell, W.; Blumenstock, T. et al

in Harris, N. R. P.; Kilbane-Dawe, I.; Amanatidis, G.T. (Eds.) Polar stratospheric ozone 1997 (1998)

Fourier transform infra-red (FTIR) measurements of stratospheric trace species have been made at a network of five ground-based sites from 79°N to 47°N during the Northern hemisphere winter of 1995/1996 ... [more ▼]

Fourier transform infra-red (FTIR) measurements of stratospheric trace species have been made at a network of five ground-based sites from 79°N to 47°N during the Northern hemisphere winter of 1995/1996. This winter was extremely cold with temperatures below the threshold for type 1 polar stratospheric cloud (PSC) formation from mid December 1995 until early March 1996 when there was a rapid warming of the stratosphere. Over 25 days experienced temperatures low enough for ice cloud (PSC type 2) formation. Vertical columns values for HCl, ClONO2, HF and HNO3 have been derived from FTIR measurements at the following sites: Ny Alesund, Spitzbergen (79°N, 12°E); Kiruna, Sweden (67°N, 21°E); Harestua, Norway (60°N, 11°E); London, England (51°N, 0°E) and the Jungfraujoch, Switzerland (48°N, 8°E), with measurements of other stratospheric trace gases, including O3 and ClO available from some of the sites. All of these sites are equipped with high resolution Bruker 120HR or 120M spectrometers, recording atmospheric spectra in the mid infrared using the Sun as a source. These measurements have been used to provide both evidence of substantial activation within large areas of the polar vortex and a subsequent O3 depletion. The measurements suggest a well mixed central vortex area surrounded by a vortex edge that may be highly variable in composition. The measurements also provide evidence of substantial mixing of activated air from the edge of the polar vortex into middle latitudes. Comparison with the SLIMCAT 3D chemical transport model highlights the underestimation of ClONO2 concentrations in the model, with subsequent implications for underestimating O3 loss. [less ▲]

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See detailLEARN-NETT : une expérience d'apprentissage collaboratif à distance
Charlier, Bernadette; Daele, Amaury; Docq, Françoise et al

in Le point sur la recherche en éducation en Communauté française : actes du 1er congrès des chercheurs en éducation, Bruxelles, 24-25 mai 2000 (1998)

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See detailDevelopment of an in vitro culture method of very immature embryos to assist wide interspecific hybridisation in Phaseolus.
Geerts, P.; Baudoin, Jean-Pierre ULg; Mergeai, Guy ULg

in 3rd European conference on grain legumes : Opportunities for high quality, healthy and added-value crops to meet European demands, 14-19 November 1998, Valladolid, Spain (1998)

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See detailEosiniphilic bronchopulmonary disease in dogs (EBP): a clinical analysis of 25 cases.
Clercx, Cécile ULg; Snaps, Frédéric ULg; Peeters, Dominique ULg et al

in Proceedings of the 8th Annual Congress of the ESVIM (1998)

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See detailDifferential diagnosis of tachypnea in newborn calves : a field study
Rollin, Frédéric ULg; Dardenne, A; Danlois, F et al

in In Proceedings of the World Assoc. Buiatrics Congress (1998)

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See detailThe St-Michel reconstruction-project in Liège : A morphological regulation case study
Teller, Jacques ULg; Dupagne, A.

in Proc. of COST Urban Civil Engineering - Action C4 Final Conference (1998)

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See detailThe Tribology of Valve Seals in Cryogenic Rocket Engines
de Lamotte, E.; Bozet, Jean-Luc ULg; Garcia Marirrodriga, C.

in 7th European Space Mechanisms and Tribology Symposium (1998)

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See detailMorphometry of diamond superabrasives using image analysis
Pirard, Eric ULg; Nivart, Jean-François

in Proceedings 7th European Symposium on Particle Characterization (1998)

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See detailDétermination du besoin en méthionine du taurilon Blanc Bleu Belge culard en croissance.
Froidmont, Eric; Beckers, Yves ULg; Thewis, André ULg

in Rencontres Recherches Ruminants. (1998)

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See detailAn Efficient Implicit Scheme for the Treatment of Frictional Contact between Deformable Bodies
GRAILLET, D.; Ponthot, Jean-Philippe ULg

in Proceedings of "First ESAFORM Conference on Material Forming" (1998)

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See detailAccuracy of digital measurements in optical microscopy imaging
Pirard, Eric ULg; Correa de Araujo, Maria

in Proceedings 7th European Congress for Stereology (1998)

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See detailEvolution de l'agriculture wallonne au cours des vingt dernières années
Burny, Philippe ULg

in Association belge d'Economie Rurale (Ed.) Deuxième workshop pour économistes agricoles (1998)

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See detailStiffness design of column bases
Braham, M.; Jaspart, Jean-Pierre ULg

in Proceedings of the Second World Conference on Constructional Steel Design (1998)

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See detailPour une nouvelle donne entre linguistique, linguistique appliquée et didactique des langues étrangères (FLE) - exemple de la lecture
Defays, Jean-Marc ULg; Maréchal, Marielle ULg

in Spinger, Claude (Ed.) Actes du 2e Colloque de Linguistique Appliquée : "Les linguistiques appliquées et les Sciences du langage". (1998)

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See detailPresurgical octreotide treatment in acromegaly
Stevenaert, Achille ULg; Beckers, Albert ULg

in 5th International Pituitary congress - abstract book (1998)

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See detailPractical protocol for large marine mammals necropsy and beach management
Jauniaux, Thierry ULg; Garcia Hartmann, M.; Coignoul, Freddy ULg

in meeting report (1998)

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