References of "Scientific congresses and symposiums"
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See detailMesure des odeurs par le nez électronique
Nicolas, Jacques ULg

Conference (2002, February)

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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 detailConfrontation entre le Szondi et le Rorschach
Stassart, Martine ULg

Conference (2002, January 30)

The author comments the conclusions of the research of Pr Jean Mélon about the correlations between Szondi- and Rorschachtests of 562 subjects (Doctoral These in Psychology, "Figures du moi. Szondi ... [more ▼]

The author comments the conclusions of the research of Pr Jean Mélon about the correlations between Szondi- and Rorschachtests of 562 subjects (Doctoral These in Psychology, "Figures du moi. Szondi, Rorschach et Freud ", May 1976, University of Liege). [less ▲]

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See detailActivation of the NF-kappaB transcription factor by Camptothecin
Habraken, Yvette ULg; Piette, Jacques ULg

Poster (2002, January 30)

We used Camptothecin (CPT) a DNA topoisomerase I inhibitor to introduce double-strand breaks (DSB) in DNA. CPT and derivatives presently used in chemotherapy are known to have maximal cytotoxicity for ... [more ▼]

We used Camptothecin (CPT) a DNA topoisomerase I inhibitor to introduce double-strand breaks (DSB) in DNA. CPT and derivatives presently used in chemotherapy are known to have maximal cytotoxicity for cells in S phase. We have shown that the activation of NF-κB and its transcriptional activity are enhanced in S phase HeLa cells. The CPT-induced activation of NF- κB is slow but stable. However, the composition of the complex evolves with time from mostly p50/p65 after 2 h to almost exclusively p52 after 24 h. The signal transduction progresses through the activation of the IKK complex, the phosphorylation of IκBα on S32 and S36 and the degradation of the inhibitor by the 26S proteasome. The transient expression of a kinase inactive mutant of NIK abolishes the activation of NF-κB by CPT indicating that this kinase could play a role upstream of the IKK complex whereas a dominant negative form of MEKK1 has no effect. To better understand the early steps of the signaling cascade initiated by the DSB, we compare the induction of NF-κB in both NBS-/- and NBS+/+ fibroblasts. NBS turn out to be implicated in NF-κB activation by X-rays, it does not seems to be important for activation by CPT supporting the idea that the components of the signaling cascade are not identical. [less ▲]

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See detailLa valorisation des proéagineux et des oléagineux dans l'alimentation à la ferme
Beckers, Yves ULg

Conference (2002, January 25)

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See detailDu bon usage des antihypertenseurs
Krzesinski, Jean-Marie ULg

Conference (2002, January 17)

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See detailActivation of the NF-kappaB transcription factor by DNA damage
Habraken, Yvette ULg; Piette, Jacques ULg

Poster (2002, January 07)

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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 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)

Detailed reference viewed: 23 (4 ULg)
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)

Detailed reference viewed: 47 (10 ULg)
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See detailStorage of secondary effluents for safe reuse in agriculture
Trad Rais, M.; Xanthoulis, Dimitri ULg; Gardin, N.

Conference (2002, January)

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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 detailRégénération de Phaseolus vulgaris L. et P. polyanthus Greenm. à partir d'embryons immatures en vue de leur hybridation interspécifique
Toussaint, André ULg; Geerts, P.; Clément, F. et al

in Actes des VIIIèmes Journées Scientifiques du Réseau "Biotechnologies, Amélioration des plantes et Sécurité alimentaire" (2002)

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See detailSpray controller for horizontal boom movements compensation
El Bahir, Loussain; Lebeau, Frédéric ULg; Destain, Marie-France ULg et al

in Proceedings of AgEng2002 (2002)

Longitudinal spray distribution is mainly affected by the horizontal speed variations of the nozzles. Manufacturers classically try to reduce unwanted nozzles movements using horizontal boom suspension ... [more ▼]

Longitudinal spray distribution is mainly affected by the horizontal speed variations of the nozzles. Manufacturers classically try to reduce unwanted nozzles movements using horizontal boom suspension but these methods show performance and price limitations. The purpose of this paper is to propose a spray controller aiming to compensate the effect of the horizontal boom movements on the spray distribution besides the effect of tractor speed variations. The controller is based on three main parts: a control law describing the relationship between nozzle speed, nozzle flow and spray coverage; a real time measurement of the boom horizontal speed variations using micro-machined capacitive accelerometers and Pulse Width Modulation (PWM) no zzle flow actuators. A prototype was developed using a processor board controller (dSpace) and tested on a laboratory test bench. The nigrosine solution spray coverage was measured using image analysis for field representative multi-sine nozzle speed variations. The spray coverage uniformity using the spray controller showed about 51% compensation of the spray coverage variations observed without controller. [less ▲]

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See detailConsequences of t-channel unitarity for the interaction of real and virtual photons at high energies
Martynov, E.; Cudell, Jean-René ULg; Soyez, G.

in Jenkovsky, L.; Fiore, R. (Eds.) DIFFRACTION 2002: INTERPRETATION OF THE NEW DIFFRACTIVE PHENOMENA IN QUANTUM CHROMODYNAMICS AND IN THE S - MATRIX THEORY (2002)

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See detailEchos d’un chef-d’œuvre perdu de Pierre Bruegel l’Ancien. Les deux versions de la Chute d’Icare conservées à Bruxelles
Allart, Dominique ULg

in ICOM-CC 13th Triennal Meeting , Rio de Janeiro, 23-28/9/2002. Proceedings (2002)

La célébrissime Chute d'Icare des Musées royaux des Beaux-Arts de Belgique à Bruxelles est considérée comme l’une des œuvres majeures de Pierre Bruegel l'Ancien. Or son état matériel éveille la perplexité ... [more ▼]

La célébrissime Chute d'Icare des Musées royaux des Beaux-Arts de Belgique à Bruxelles est considérée comme l’une des œuvres majeures de Pierre Bruegel l'Ancien. Or son état matériel éveille la perplexité : l'œil exercé y repère des anomalies inquiétantes. Son examen technique a été entrepris avec la collaboration de l’IRPA (Bruxelles). L'étude au C14 de la toile du support et celle du dessin sous-jacent par réflectographie infrarouge invitent à y voir une copie réalisée à la fin du XVIe siècle ou au début du XVIIe, probablement d’après un original perdu de Bruegel. Une autre version de la composition est conservée à Bruxelles, au Musée Van Buuren. Injustement éclipsée par celle des Musées royaux des Beaux-Arts de Belgique, elle mérite d’être reconsidérée, même si elle n’est pas non plus due au pinceau de Bruegel. Peinte sur panneau, elle a été datée de la fin du XVIe siècle par dendrochronologie. [less ▲]

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See detailBelgian Report to the IAG-subcommission “EUREF”
Bruyninx, Carine; Defraigne, Pascale; Ducarme, Bernard et al

in Torres, J.; Hornik, H. (Eds.) EUREF Publication N°10 (2002)

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See detailProliferation generation of auditory hair cells in culture
Malgrange, B; Belachew, S; Thiry, Marc ULg et al

in Acta Oto-Rhino-Laryngologica Belgica (2002), 56

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See detailThe influence of Space Weather and of the ionosphere on Global Navigation Satellite Systems
Warnant, René ULg; Jodogne, Jean-Claude; Nebdi, Hamid

Conference (2002)

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See detailDetuning effects in the one-photon mazer
Bastin, Thierry ULg; Martin, John ULg

Poster (2002)

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See detailPolymerization in Inverse Microemulsion: An Effective Tool to Produce Biodegradable and non Biodegradable Nanoparticles
Lebon, F; Grandfils, Christian ULg; Jérôme, Robert ULg et al

in Proceedings of Material Research Society (MRS) (2002)

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See detailStrontium ranelate antifracture study program : current data
Reginster, Jean-Yves ULg; Meunier, P. J.

in Osteoporosis International (2002), 13(S1), 153-154

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See detailApproche clinique des ictères et des suspicions d’insuffisance hépatique aiguë chez le cheval : une étude rétrospective sur 40 cas
Amory, Hélène ULg; Sandersen, Charlotte ULg; Delguste, Catherine ULg et al

in Proceedings of the Annual meeting of the French Equine Veterinary Association (AVEF) (2002)

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See detailFamilial isolated pituitary tumors : clinical and molecular studies in 80 patients
Valdes Socin, Hernan Gonzalo ULg; Jaffrain-Réa, M. L.; Tamburrano, G. et al

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

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See detailA short-term run-in study can significantly contribute to increasing the quality of long-term osteoporosis trials. The strontium-ranelate phase 3 program
Reginster, Jean-Yves ULg; Spector, T.; Badurski, J. et al

in Osteoporosis International (2002), 13(S1), 30

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See detailDe l'image de l'autre à sa représentation : médiation et médiatisation
Servais, Christine ULg

in Trajectoires interculturelles : Représentation et image de l'autre dans le domaine francophone (2002)

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See detailRepairing Concrete with Self Compacting Concrete: Testing Methodology Assessment
Courard, Luc ULg; Darimont, Anne ULg; Degeimbre, Robert ULg et al

in Shah, S. P. (Ed.) Self-Consolidating Concrete (2002)

The repair of concrete deck slabs or balcony needs a special composition of concrete and self-compacting concrete (SCS) is advantageously used for such repair operation in comparison with patch repair or ... [more ▼]

The repair of concrete deck slabs or balcony needs a special composition of concrete and self-compacting concrete (SCS) is advantageously used for such repair operation in comparison with patch repair or gunite. Two compositions of concrete (classical and SCC concretes) and two repair mortars are tested according to a new testing procedure. The penetration of SCC beneath the concrete plate structure but also the adhesion to the old concrete substrate are analysed. The rheology of the material is measured by means of usual tests and rheometer. The different materials have been characterised through physical, chemical and mechanical test program. Two types of applications (vertical and horizontal) are presented and commented. Analysis of the interface between concrete substrate and SCC is given on the base of pull-off test and microscopical observations. [less ▲]

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See detailHow to get the most information out of your necropsy
Jauniaux, Thierry ULg; Coignoul, Freddy ULg

in COST Meeting proceedings (2002)

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See detailFamilial secreting-pinealomas : biological and preliminary genetic studies
Allouch, A.; Valdes Socin, Hernan Gonzalo ULg; Hendrick, J. C. et al

in 10th Meeting of the European Neuroendocrine Association - Abstract book (2002)

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See detailA steel beam element accounting for the cross section deformation
Degée, Hervé ULg

in Proceedings of the 3rd DIANA World Conferences - Finite Elements in Civil Engineering Applications (2002)

Classical beam elements are based on the assumption that the cross section of the element re-mains unchanged during the entire loading. However, this can be too simple for modeling the behavior of thin ... [more ▼]

Classical beam elements are based on the assumption that the cross section of the element re-mains unchanged during the entire loading. However, this can be too simple for modeling the behavior of thin-walled steel profiles, where local and distortional buckling are likely to occur. In this perspective, a spe-cial element taking into account the deformation of the cross section is presented and some examples of com-putations of critical bifurcation loads are presented. [less ▲]

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See detailMorphological analysis of overproduction of hair cells and Deiters'cells in the E19 rat organ of Corti
Thiry, Marc ULg; Malgrange, B; Lefebvre, P

in Acta Oto-Rhino-Laryngologica Belgica (2002), 56

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See detailDetection of a single synchronous growth change in several tree-ring series of south-east France
Nicault, A.; Boreux, Jean-Jacques ULg; Rathegeber, C.

in Proceedings of the 6th international conference on dendrochronology (2002)

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See detailManagement of hypercalcemia from Parathyroid Carcinoma by immunisation
Betea, Daniela ULg; Bradwell, A. R.; Valdes Socin, Hernan Gonzalo ULg et al

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

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See detailUltrasonographic assessment of the cranial meniscal ligament in the horse.
Busoni, Valeria ULg; Valentini, S.; Snaps, Frédéric ULg

Conference (2002)

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See detailOn-line prediction of technological and organoleptic properties of beef by near infrared spectroscopy
Dotreppe, Olivier ULg; Lambotte, Sébastien; Leroy, Bernadette ULg et al

in Proceedings of the 48th International Congress of Meat Science and Technology (2002)

The aim of this study was to investigate the use of the NIR spectroscopy for on-line prediction of technological and organoleptic properties of beef in slaughterhouse. In this work, two different fibre ... [more ▼]

The aim of this study was to investigate the use of the NIR spectroscopy for on-line prediction of technological and organoleptic properties of beef in slaughterhouse. In this work, two different fibre optic probes - transmission and reflection - were compared. It can be concluded from this experiment when applied on-line that when applied on-line the NIR spectroscopy prediction of several meat quality parameters can be at less equal to those obtained directly on meat samples in the laboratory. Nevertheless, the performances varied according to the acquisition mode: the reflection and the transmission showing potentialities for prediction of colour and drip loss respectively. Before direct application on slaughterline for early meat quality prediction, the technique needs further adaptations in order to reduce the time of spectra acquisition and treatment. [less ▲]

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See detailDevelopment of a multibody model of a sprayer
Ooms, David ULg; Lebeau, Frédéric ULg; Maton, Nicolas et al

in Proceedings of AgEng (2002)

A multibody model of a sprayer boom including the suspension was developed by using ADAMS 11.0 (Mechanical Dynamics). The model was designed with the aim to describe the dynamic behaviour of different ... [more ▼]

A multibody model of a sprayer boom including the suspension was developed by using ADAMS 11.0 (Mechanical Dynamics). The model was designed with the aim to describe the dynamic behaviour of different types of booms and suspensions (double trapezium, trapezium, pendulum, …). This was obtained by creating a general model in which geometrical (dimensions) and mechanical parameters (mass and inertia, friction coefficients, stiffness and damping coefficients of the hinges, …) of the system were easily modified. A graphical interface especially designed authorised this easy modification. The validation of the model was obtained by measuring in real conditions the frame movements as solicitations and the boom movements as responses. The method was applied on a trailed sprayer equipped with a boom of 24 m and a trapezoidal suspension. Good accordance was found between measured and simulated vertical displacements. The model may decrease the development costs of suspension and boom designs. [less ▲]

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See detailModelling of electromagnetic waves in periodic media with finite elements
Nicolet, A.; Guenneau, S.; Geuzaine, Christophe ULg et al

in 2nd international conference on advanced computational methods in engineering, ACOMEN 2002 (2002)

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See detailNF-kB activity, and IL-8 and GM-CSF expression, in the milk of chorionic mastitis-affected cows
Boulanger, Delphine; Bureau, Fabrice ULg; Lekeux, Pierre ULg

in National Mastitis Council Proceedings (2002)

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See detailA silvicultural decision support system for pure larch stands: helping managers to meet their goals.
Pauwels, D.; Lejeune, Philippe ULg; Balandier, P. et al

in Improvement of larch (Larix sp.) for better growth, stem form and woodquality. Proceedings of an International Symposium, Gap (Hautes-Alpes)- Auvergne & Limousin, France, 16-21 September, 2002. (2002)

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See detailEthanol-conditioned withdrawal syndrome
Quertemont, Etienne ULg; De Witte, Philippe

in Proceedings of the 22nd European Winterconference on Brain Research (2002)

The withdrawal syndrome is closely related to the concepts of tolerance and physical dependence. The chronic consumption of a drug is believed to induce adaptive changes that are designed to oppose the ... [more ▼]

The withdrawal syndrome is closely related to the concepts of tolerance and physical dependence. The chronic consumption of a drug is believed to induce adaptive changes that are designed to oppose the acute effects of the drug. Such adaptive changes increase the tolerance to acute drug effects but lead to physical dependence, which is revealed by withdrawal symptoms when the drug is cleared from the body. However, another form of adaptive response to repeated drug consumption has been identified. This adaptive response appears after the intermittent repeated administration of a drug in association with the same set of environmental stimuli. After several associations, these environmental stimuli become able to induce a conditioned adaptive response. Such response leads to the phenomenon of “environment-dependent tolerance” that was observed with many drugs of abuse. However, if the drug is not administered, the conditioned stimuli alone may induce a “conditioned withdrawal syndrome”. Although less studied than the classical withdrawal syndrome, this conditioned withdrawal syndrome may be of importance for the development of drug dependence. In our experiments, we have studied the development of a conditioned withdrawal syndrome after repeated associations of a specific set of environmental stimuli with ethanol injections in Wistar rats. After repeated administrations of ethanol, the rats showed a clear environmental-dependent tolerance to ethanol. Furthermore, these conditioned stimuli induced behavioral (hyperexcitation) and neurochemical (increase glutamate release) responses similar to those observed after chronic alcohol withdrawal. [less ▲]

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See detailTwo-dimensional Harmonic Balance Finite Element Modelling of Electromagnetic Devices coupled to Nonlinear Circuits
Gyselinck, J.; Dular, Patrick ULg; Geuzaine, Christophe ULg et al

in Proceedings of the XVII Symposium on Electromagnetic Phenomena in Nonlinear Circuits, EPNC 2002 (2002)

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See detailIncreased platelet reactivity to collagen in transgenic mice overexpressing the P2X1 ion channel.
Oury, Cécile ULg; Kuijpers, marijke; Toth-Zsamboki, Emese et al

in Haematologica (2002), 87

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See detailPharmacological evaluation of cromakalim analogues: towards the discovery of new inhibitors of insulin secretion from rat pancreatic -cells
Sebille, S.; Becker, B.; Antoine, M. H. et al

in Fundamental & Clinical Pharmacology (2002)

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See detailField study on the influence of calf pathologies on growth in Belgian Blue cattle
de Behr, V.; Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg et al

in Abstracts, XXII World Buiatrics Congress (2002)

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See detailSingle step synthesis of metal catalysts supported on porous carbon with controlled texture
Job, Nathalie ULg; Ferauche, Fabrice; Pirard, René ULg et al

in Studies in Surface Science and Catalysis (2002)

This paper presents an original preparation method of metal catalysts supported on carbon porous material [1]. Carbon porous materials can be synthesised by evaporative drying and pyrolysis of aqueous ... [more ▼]

This paper presents an original preparation method of metal catalysts supported on carbon porous material [1]. Carbon porous materials can be synthesised by evaporative drying and pyrolysis of aqueous resorcinol-formaldehyde gels whose operating, variables are correctly chosen. The porous texture of these materials is mainly controlled by the precursor solution pH. Texture analysis shows that it is possible to tailor the morphology of these materials : indeed, micro-macroporous, micro-mesoporous, microporous or non porous materials can be obtained by varying the pH value in a narrow pH interval. This texture control is slightly influenced by the introduction of a metal in the gel : the limits of the pH interval can slightly differ when a metal salt is added to the resorcinol-formaldehyde aqueous solution. Carbon supported nickel and palladium catalysts prepared by this method have proven to be active for ethylene hydrogenation. [less ▲]

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See detailThe Jungfraujoch Suntracker Camera.
Servais, Christian ULg

Conference (2002)

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See detailStatistical analysis of the validation results: diagnostic or decision tools
Hubert, Philippe ULg; Chiap, Patrice ULg; Dormal, C. et al

Conference (2002)

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See detailElectron localization in lithium niobate
Veithen, M.; Ghosez, Philippe ULg

in AIP Conference Proceedings (2002), 626

Using a plane-wave pseudopotential approach to density functional theory, we investigate the degree of electron localization in lithium niobate. We pay a particular attention to its variation during the ... [more ▼]

Using a plane-wave pseudopotential approach to density functional theory, we investigate the degree of electron localization in lithium niobate. We pay a particular attention to its variation during the phase transition and to the relationship with the electronic structure and the Born effective charges in this material. A band-by-band decomposition allows us to focus on the different bands composing the energy spectrum of this compound. At variance with previous calculations based on finite differences, the localization tensor has been obtained using linear-response techniques. [less ▲]

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See detailNF-kB activity, and IL-8 and GM-CSF expression, in the milk of chronic mastitis-affected cows
Boulanger, D.; Bureau, Fabrice ULg; Lekeux, Pierre ULg

in Proceedings : National Mastitis Council, 41st Annual Meeting (2002)

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See detailNew results in the defensive chemistry of Crematogaster ants
Laurent, Pascal ULg; Hamdani, Anissa; Braekman, Jean-Claude et al

Poster (2002)

Ants of the genus Crematogaster are able to raise their abdomen forwards and over the thorax and head. In many Crematogaster species, the venom is emitted as a froth that accumulates on the spatulate ... [more ▼]

Ants of the genus Crematogaster are able to raise their abdomen forwards and over the thorax and head. In many Crematogaster species, the venom is emitted as a froth that accumulates on the spatulate portion and at the basis of the sting, and thus can be easily applied to the integument of enemies. In the three European species of Crematogaster ants, the Dufour gland contains complex mixtures of long chain derivatives bearing a (E,E)-cross-conjugated dienone linked to a primary acetate function. When the venom is emitted, these compounds are transformed into highly electrophilic and toxic 4-oxo-2,5-dienals by an esterase and an oxidase stored in the poison gland. On the other hand, the Dufour gland of one Crematogaster species from Papua-New Guinea produces long chain furan derivatives, whereas two Brazilian species produce furanocembrene diterpenes. To further investigate the defensive mechanisms in this genus and to assess whether the composition of the Dufour gland secretion could be used for taxonomic purposes, we have now studied two other Crematogaster species. The Dufour gland of C. nigriceps from Africa contains a mixture of l-alkyl-l,3,5-cyclohexanetriols. In C. montezumia, collected in Argentina, the defensive mechanism is based on the production of triacylglycerols bearing polyunsaturated fatty acids containing (Z,Z,Z)-conjugated trienes or (5E,8Z,10Z,12Z)-tetraenes, which are responsible for the strong sticking properties of the secretion. [less ▲]

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See detailDetuning effects in the one-photon mazer
Martin, John ULg; Bastin, Thierry ULg

Poster (2002)

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See detailHorse production
Lekeux, Pierre ULg; Art, Tatiana ULg

in Proceedings: 53rd Annual Meeting of the European Association for Animal Production (2002)

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See detailLa protection juridique de l'embryon
Leleu, Yves-Henri ULg; Langenaken, Evelyne ULg

in Rapports du XIeme congrès de l'Académie internationale de droit comparé (2002)

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See detailÉ possibile selezionare dei bovini meno sensibili alle malattie respiratorie ?
Lekeux, Pierre ULg; Bureau, Fabrice ULg; Jacqmot, Olivier

in Proceedinds: 4° Congresso Nazionale Multisala SIVAR (2002)

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See detailThe green lacewings in Belgium (Neuroptera : Chrysopidae)
Bozsik, Andras; Mignon, Jacques ULg; Gaspar, Charles

in Acta Zoologica Academiae Scientiarum Hungaricae (2002), 48(Suppl. 2), 53-59

There are merely three published sources of information on the green lacewings in Belgium. The first two were written by a Belgian and a Catalan author at the beginning of the 20th century and the third ... [more ▼]

There are merely three published sources of information on the green lacewings in Belgium. The first two were written by a Belgian and a Catalan author at the beginning of the 20th century and the third was published in 1980. Interestingly, the most recent study reported the fewest species (11), the most previous contained 12 and the second one showed 17 species, This confused situation and the paucity of data initiated the authors to identify the green lacewing collection of the Gembloux University of Agricultural Sciences, where lacewings from different parts of Belgium were preserved, and also to collect chrysopids regularly, Summarising the species reported in the literature and caught during sampling, 18 green lacewing species have been verified in Belgium: Nothochrysa fulviceps, Nothochrysa capitata, Hypochrysa elegans, Nineta flava, Nineta vittata, Nineta pallida, Chrysotropia ciliata, Chrysopa perla, Chrysopa dorsalis, Chrysopa abbreviata, Chrysopa formosa, Chrysopa phlyllochroma, Chrysopa pallens, Dichochrysa flavifrons, Dichochrysa prasina, Dichochrysa ventralis, Chrysoperla carnea, Cunctochrysa albolineata. Considering the known references, one species, Nineta pallida proved to be new for the Belgian fauna. [less ▲]

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See detailResuscitation procedures to improve perinatal adaptation in calves
Uysterpruyst, C. H.; Coghe, J.; Dorts, T. H. et al

in Proceedings : XXIIth World Buiatrics Congress (2002)

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See detailMyoglobinurie atypique: nouveaux cas en Belgique et en France
Delguste, Catherine ULg; Amory, Hélène ULg

in Proceedings of the 19th annual meeting of the Belgian Equine Practitioners Society (BEPS) (2002)

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See detailL'équité des systèmes éducatifs, une question de point de vue
Baye, Ariane ULg

Conference (2002)

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See detail3D finite element computation of a linear transverse flux actuator
Deliège, Geoffrey ULg; Vande Sande, Hans; Hameyer, Kay et al

in International conference on Power electronics, machines and drives, Bath, UK, April 16-18, 2002 (2002)

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See detailPurification and characterization of a pregnancy-associated glycoprotein (ovPAG-6) from sheep placenta removed between 66 to 100 days of gestation.
El Amiri, B.; Remy, B.; Melo de Sousa, Noelita ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2002), 6(1), 12-13

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See detailDo Temperature Variations at the Surface of a Hot Non-Radial Pulsator Change Significantly the Line-Profile Variations?
De Ridder, J.; Aerts, C.; Dupret, Marc-Antoine ULg et al

in IAU Colloq. 185: Radial and Nonradial Pulsationsn as Probes of Stellar Physics (2002)

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See detailEntre aliénations et libertés: les toxicomanies
Charlier, Corinne ULg

Conference (2002)

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See detailMetabolic stress as a paradigm to elucidate genotype-environment interaction in psychosis
Marcelis, Machteld; Cavalier, Etienne ULg; Gielen, Jacques et al

in Acta Psychiatrica Scandinavica (2002), 105(Suppl. 411), 91

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See detailMicelles CSC étudiées par microscopie à force atomique
Willet, Nicolas ULg; Gohy, Jean-François; Jérôme, Robert ULg

Conference (2002)

Les assemblages supramoléculaires suscitent un grand intérêt parmi la communauté scientifique de nos jours. Un nouveau type de micelles formées dans l’eau est ici rapporté. En effet, dans l’eau, le ... [more ▼]

Les assemblages supramoléculaires suscitent un grand intérêt parmi la communauté scientifique de nos jours. Un nouveau type de micelles formées dans l’eau est ici rapporté. En effet, dans l’eau, le copolymère triséquencé poly(styrène)-b-poly(2-vinylpyridine)-b-poly(oxyde d’éthylène) (PS-b-P2VP-b-POE) forme spontanément des micelles sphériques monodisperses, dont la structure interne a été étudiée par microscopie à force atomique. Dans la plupart des cas d’études supramoléculaires, des copolymères biséquencés amphiphiles sont dissouts dans un solvant sélectif d’un des constituants, ce qui mène à la formation de micelles sphériques consistant en un cœur formé par les blocs insolubles entouré d’une couche des blocs solvatés. On sait que les copolymères triséquencés ABC s’organisent spontanément en une grande variété de structures supramoléculaires à l’état solide, mais leur association dans des solvants sélectifs a été peu rapportée jusqu’ici. Nous rapportons ici la formation de micelles aqueuses constituées de trois couches à partir du copolymère triséquencé PS-b-P2VP-b-POE. Elles ont été baptisées micelles CSC (de l’anglais core-shell-corona). Les masses moléculaires des différents blocs sont 20 000 pour le PS, 14 000 pour la P2VP, et 26 000 pour le POE. Nous nous attendons donc à la formation de micelles CSC consistant en un cœur de PS, une couche intermédiaire de P2VP, et une couronne de POE. De par la dépendance de la solubilité dans l’eau du bloc central de P2VP vis-à-vis du degré d’ionisation, les micelles CSC devraient être sensibles au pH. La structure des micelles CSC à l’état sec a été étudiée par microscopie à force atomique (AFM) en mode tapping. Ces observations complètent une étude par microscopie électronique à transmission (TEM). A pH>5, des micelles sphériques, hautement régulières et de faible polydispersité sont observées, en accord avec les études de diffusion de lumière dynamique (DLS) et de TEM. Le diamètre des micelles CSC à l’état sec a été mesuré (DCSC  60 nm). Cette valeur est logiquement inférieure au diamètre hydrodynamique (Dh  75 nm, par DLS), car la couronne de POE est désolvatée. A pH<5, l’image AFM des micelles CSC montre qu’elles ont des dimensions caractéristiques (DCore  30 nm et DCore+Shell  40 nm) qui sont en accord qualitatif avec celles estimées via les images TEM. Les nanoparticules métalliques et semi-conductrices sont les nouveaux candidats idéaux pour l’électronique, les nanosystèmes optiques, etc. De telles nanoparticules peuvent être synthétisées dans des réacteurs confinés tels que les cœurs micellaires de copolymères séquencés amphiphiles, avec l’inconvénient que la taille de la nanoparticule, qui est fixée par les dimensions du cœur micellaire, ne peut varier que dans une gamme limitée à quelques nanomètres. Bien au contraire, les blocs P2VP des micelles CSC peuvent être utilisés comme un moule pour la production de nanocouches métalliques, dont l’épaisseur peut être ajustée par la masse moléculaire du bloc de P2VP. La couche de P2VP a été sélectivement chargée d’ions AuCl4–, grâce à l’interaction sélective entre les ions et les unités 2VP protonnées. L’excès d’ions AuCl4– n’interagissant pas a été éliminé par dialyse, suivie par la réduction des centres Au3+ en Au0, par irradiation électronique ou par NaBH4. Les micelles chargées d’or ont une structure uniforme. Cependant, des expériences d’absorption UV-visible mettent en évidence la persistance de particules d’or individuelles au sein de la couche de P2VP. Il ne se forme donc pas de mur d’or continu. Il reste à optimiser les conditions de chargement en HAuCl4 des micelles CSC et de réduction. En complémentarité avec d’autres techniques, l’AFM nous a donc permis d’observer que le copolymère triséquencé PS(20 000)-b-P2VP(14 000)-b-POE(26 000) forme des micelles bien définies. La couche de P2VP peut servir de réacteur pour la synthèse de nanoparticules d’or. Enfin, la couche de P2VP, sensible au pH, rend ce système utile pour l’encapsulation et/ou le relargage de principes actifs. [less ▲]

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See detailThe role of basalt chemical weathering on the CO2 cycle
Dupre, B.; Dessert, C.; Grard, Aline ULg et al

in Geochimica et Cosmochimica Acta (2002), 66(15A), 202-202

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See detailDosages réalisables pour le diagnostic de gestation
Melo de Sousa, Noelita ULg; El Amiri, B.; Sulon, J. et al

in Journées Européennes de la Société Française de Buiatrie 2002 (2002)

Lorsque les signaux embryonnaires de la gestation induisent une modification du côté maternel, une possibilité nouvelle s’ouvre aux chercheurs attentifs au développement de tests pour le diagnostic ou le ... [more ▼]

Lorsque les signaux embryonnaires de la gestation induisent une modification du côté maternel, une possibilité nouvelle s’ouvre aux chercheurs attentifs au développement de tests pour le diagnostic ou le suivi de la gestation. Dans ce chapitre, nous essayerons de passer en revue les différentes molécules dont le dosage ou la mise en évidence a fait l’objet de publications scientifiques en relation avec le diagnostic de la gestation. Dans la mesure du possible, nous envisagerons les différents marqueurs en suivant la chronologie de leur apparition au cours de la gestation, mais ce critère ne prendra pas un caractère absolu car souvent plusieurs molécules se recouvrent, ou encore leur apparition au niveau de placenta précède largement le moment où elles apparaissent dans le sang maternel en quantités mesurables. Nous essayerons également, de connecter chaque molécule avec l’application que son dosage permet dans la clinique vétérinaire. Pour terminer, nous ferons une description rétrospective de quelques cas cliniques bien documentés qui montrent l’importance de l’association du dosage de protéines associées à la gestation et de la progestérone pour arriver à une meilleure compréhension des échecs observés dans le déroulement de la gestation. [less ▲]

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See detailComposite structures optimization using sequential convex programming
Bruyneel, Michaël ULg; Fleury, Claude ULg

in Advances in Engineering Software (2002), 33(7-10), 697-711

The design of composite structures is considered here. The approximation concepts approach is used to solve the optimization problem. The convex approximations of the MMA family are briefly described ... [more ▼]

The design of composite structures is considered here. The approximation concepts approach is used to solve the optimization problem. The convex approximations of the MMA family are briefly described. Several modifications of these approximations are presented. They are now based on gradient information at two successive iterations, avoiding the use of the expensive second-order derivatives. A two-point fitting scheme is also described, where the function value at the preceding design point is used to improve the approximation. Numerical examples compare these new purely non-monotonous schemes to the existing ones for the selection of optimal fibers orientations in laminates. It is shown how these two-point based approximations are well adapted to the problem and can improve the optimization task, leading to reasonable computational efforts. A procedure is also derived for considering simultaneously monotonous and non-monotonous structural behaviors. The resulting generalized approximation scheme is well suited for the optimization of composite structures when both plies thickness and fibers orientations are considered as design variables. It is concluded that the newly developed approximation schemes of the MMA family are reliable for composite structures optimization. All the studied approximations are convex and separable: the optimization problem can then be solved using a dual approach. (C) 2002 Civil-Comp Ltd and Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailPinéalomes familiaux : Etudes biologiques et génétiques préliminaires
Allouch, A.; Valdes Socin, Hernan Gonzalo ULg; Hendrick, J. C. et al

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

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