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See detailThe dynamics of the guests in filled germanium clathrates
Hermann, Raphaël ULg; Grandjean, Fernande ULg; Keppens, V. et al

in Mater. Res. Soc. Symp. Proc. Vol. 886 (2006)

In the filled gallium-germanium clathrates, R8Ga16Ge30, where R is Ba, Sr, or Eu, the guests are located in two large cages and are weakly bound to the crystalline clathrate framework. The caged guests ... [more ▼]

In the filled gallium-germanium clathrates, R8Ga16Ge30, where R is Ba, Sr, or Eu, the guests are located in two large cages and are weakly bound to the crystalline clathrate framework. The caged guests exhibit a localized "rattling" vibrational mode that provides an efficient mechanism for reducing the thermal conductivity. Inelastic neutron scattering and nuclear inelastic scattering measurements have yielded the phonon density of states in R8Ga16Ge30; the line width of the localized vibrational modes is found to be an important parameter in determining the lattice thermal conductivity. Neutron diffraction studies on R8Ga16Ge30 have shown that the guests in the larger cage are located off-center, and it was proposed that their jumping about the four off-center locations is responsible for the observed glass-like thermal conductivity at temperatures below 10 K. The detection of such slow guest motion is challenging because the typical time and energy scales involved are ca. 4 ns and 1 mu eV, respectively. We have studied the slow europium tunneling dynamics in Eu4Sr4Ga16Ge30 by both Mossbauer and microwave absorption spectroscopy. [less ▲]

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See detailThe processes of going into fatherhood: a clinical approach.
Naziri, Despina ULg; De Coster, L.

Poster (2006)

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See detailAssociation Acromégalie - Hyperparathyroïdie primaire : Néoplasie endocrinienne multiple de type 1 (NEM1) ou une nouvelle entité? Une étude du groupe de tumeurs neuroendocriniennes (GTE)
Valdes Socin, Hernan Gonzalo ULg; Delemer, B.; Burlacu, M. et al

in 23ème Congrès de la Société Française d'Endocrinologie - Abstract book (2006)

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See detailInvestigation of blood oxidant/antioxidant markers in healthy competition horses : effect of discipline and gender.
Kirschvink, N.; De Moffarts, Brieuc; Farnir, Frédéric ULg et al

in 7th International Conference on Equine Exercise Physiology (2006)

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See detailApport de la granulométrie laser dans la caractérisation physique des fillers calcaires
Michel, Frédéric ULg; Courard, Luc ULg

in Arliguie, Ginette (Ed.) Compte-rendu des Journées Scientifiques du (RF)2B (2006)

On assiste actuellement en Belgique à une baisse importante de la production des matériaux habituellement employés comme additions dans les composites à matrice cimentaire (cendres volantes, laitier de ... [more ▼]

On assiste actuellement en Belgique à une baisse importante de la production des matériaux habituellement employés comme additions dans les composites à matrice cimentaire (cendres volantes, laitier de haut fourneau). Pour faire face à ce problème, un vaste programme de recherche a été mis sur pied dans le but d’évaluer le potentiel de valorisation de fillers calcaires, de production wallonne, dans ce secteur. Ce papier traite des techniques utilisées pour caractériser de manière physique les fillers calcaires. Une étude paramétrique a permis de définir les conditions optimales de mesure de leur granulométrie par diffraction laser. Les résultats ont été comparés à ceux obtenus par la technique plus classique de tamisage en voie humide. La surface spécifique des poudres a également été mesurée par adsorption d’azote (méthode BET), par perméabilité (Blaine) et calculée à partir des résultats de la diffraction, via le diamètre de Sauter. [less ▲]

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See detailYBa2Cu3O(7-delta) thick films on Ag prepared by the electrophoretic deposition technique
Dusoulier, Laurent; Denis, Samuel; Fagnard, Jean-François ULg et al

in Journal of Physics: Conference Series (2006), 43

YBa2Cu3O7-δ thick films have been deposited onto Ag substrates by the Electrophoretic Deposition (EPD) technique. Different microstructures and electrical behaviours were observed depending on the ... [more ▼]

YBa2Cu3O7-δ thick films have been deposited onto Ag substrates by the Electrophoretic Deposition (EPD) technique. Different microstructures and electrical behaviours were observed depending on the starting powder. Coatings prepared from commercial powder displayed significant porosity and the superconducting transition width was found to be magnetic-field dependent. Films produced from home-made coprecipitated powder are denser but contain some secondary phases. No dependence of the resistive transition as a function of magnetic field (H ≤ 20 Oe) was observed in that case. [less ▲]

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See detailFluctuations dans la sensibilité à l’enrofloxacine des populations nasales chez le porcelet au cours d’un traitement parentéral
Mainil, Jacques ULg; Janssen, L.; Bimazubute, M. et al

in Proceedings: 3ème Colloque International Francophone de Bactériologie Vétérinaire (2006)

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See detailOne year follow-up of ankle-brachial blood pressure index in hemodialized patients
Saint-Remy, Annie ULg; Sumaili, Ernest; Dubois, Bernard ULg et al

in Kidney & Blood Pressure Research (2006), 29

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See detailInfluence of operating parameters on nitrite
Kouakou, Edouard; Salmon, Thierry ULg; Marchot, Pierre ULg et al

in Proceeding of the International Symposium on Environmental Biotechnology (2006)

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See detailNew generation phase coronagraphy
Mawet, Dimitri; Riaud, Pierre; Baudrand, Jacques et al

Poster (2006)

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See detailEffect of rimonabant on quality of life in overweight/obese patients
Kolotkin, R. L.; Crosby, R. D.; Scheen, André ULg et al

in Value in Health (2006), 9(3, MAY-JUN), 92

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See detailOmega 3 fatty acid complementation (fish oil) in an experimental model of feline asthma : effect on bronchial reactivity, airway inflammation and oxidative stress markers
Kirschvinck, N.; Leemans, Jérôme ULg; Delvaux, F. et al

in Proceedings: 24th Symposium of the Veterinary Comparative Respiratory Society,”Respiratory infections and zoonoses (2006)

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See detailPrognostic value of white blood cell drop in horses undergoing post-colic surgery intensive care.
Chiavaccini, Ludovica; Péters, Fabrice; Gangl, Monika et al

Conference (2006)

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See detailApplications of security-constrained optimal power flows
Capitanescu, Florin ULg; Glavic, Mevludin; Ernst, Damien ULg et al

in In Proceedings of Modern Electric Power Systems Symposium, MEPS06 (2006)

This paper proposes to formulate security control as a sequential decision making problem and presents new developments in automatic learning of sequential decision making strategies from simulations and ... [more ▼]

This paper proposes to formulate security control as a sequential decision making problem and presents new developments in automatic learning of sequential decision making strategies from simulations and/or information collected from real-life system measurements. The exploitation of these methods for the design of decision making strategies and control policies in the context of preventive and emergency mode dynamic security assessment and control is discussed and further opportunities for research in this area are highlighted. [less ▲]

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See detailSEE-COAST: The Super-Earth Explorer
Schneider, J.; Riaud, P.; Tinetti, G. et al

in Barret, D.; Casoli, F.; Lagache, G. (Eds.) et al SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics (2006)

The Super-Earth Explorer Coronagraphic Off Axis Space Telescope (SEE-COAST) is a space mission concept to be submitted to ESA call for proposals. It is devoted to the direct imaging, in the visible, of ... [more ▼]

The Super-Earth Explorer Coronagraphic Off Axis Space Telescope (SEE-COAST) is a space mission concept to be submitted to ESA call for proposals. It is devoted to the direct imaging, in the visible, of the stellar light reflected by its planetary companion. Here we present the type of planetary characterization we may accomplish with SEE-COAST, and we include a brief description of the spacecraft and mission strategy. [less ▲]

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See detailSome theoritical and numerical features of strain gradient media regarded as micromorphic media
Caillerie, Denis; Chambon, René; Collin, Frédéric ULg

Conference (2006)

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See detailStealth Distributed Hash Table: A robust and flexible super-peered DHT
Brampton, A.; MacQuire, A.; Rai, I. A. et al

in Proceedings of the 2006 ACM CoNEXT conference (2006)

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See detailOpioids sparing effect of gabapentin in neurologic thoracic outlet syndrom surgery
ROUSSEAU, Anne-Françoise ULg; LECOQ, Jean-Pierre ULg; CARLIER, Alain ULg et al

in European Journal of Anaesthesiology. Supplement (2006), 23(suppl 37), 223

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See detailLes reboisements en moabi, le cas du village de Medjoh
Semereab, E.; Doucet, Jean-Louis ULg

Conference (2006)

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See detailThe Future of Space-Based Interferometry
Carpenter, K. G.; Allen, R.; Benson, J. et al

in “Future Directions for Interferometry” (2006)

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See detailCompaction of granular materials: experiments and contact dynamics simulations
Lumay, Geoffroy ULg; Ludewig, François ULg; Vandewalle, Nicolas ULg

in Journal of Physics: Conference Series (2006), 40

We present an original experimental study of the slow compaction dynamics for two- dimensional isotropic granular systems. Compaction dynamics is measured at three different scales : the macroscopic scale ... [more ▼]

We present an original experimental study of the slow compaction dynamics for two- dimensional isotropic granular systems. Compaction dynamics is measured at three different scales : the macroscopic scale through the normalized packing fraction ˜ ρ, the mesoscopic scale through the normalized fraction ˜ φ of domains ideally ordered in the system, and the microscopic scale through the grain mobility μ. The domains ideally ordered are found to obey a growth process dominated by the displacement of domain boundaries. We present also preliminary results of three-dimensional simulations with a model of contact dynamics. These results allow to discuss the difference between the two-dimensional and the three-dimensional cases. [less ▲]

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See detailA new discontinuous Galerkin method for non-linear Mechanics
Noels, Ludovic ULg; Radovitzky, Raúl

(2006)

A discontinuous Galerkin framework for large deformations of solids is established. The method is based on a general Hu-Washizu-de Veubeke functional allowing for displacement and stress discontinuities ... [more ▼]

A discontinuous Galerkin framework for large deformations of solids is established. The method is based on a general Hu-Washizu-de Veubeke functional allowing for displacement and stress discontinuities in the domain interior. The focus of this paper is on the treatment of large elasto-plastic deformations. The method is shown to possess the required numerical properties: consistency in the non-linear range and linearized stability. In order to demonstrate the versatility, accuracy and robustness of the method examples of application and convergence studies in three dimensions are provided. Further developments of the method will lead to applications where physical discontinuities must be modeled like fragmentation or failure. [less ▲]

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See detailPhysical mechanism of standing waves in cardiac electrical activity.
Dauby, Pierre ULg; Desaive, Thomas ULg; Croisier, H. et al

in SIAM conference on nonlinear waves and coherent structures (2006)

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See detailLagrangian simulations of penetration environments via mesh healing and adaptative optimisation
Mauch, Sean; Noels, Ludovic ULg; Zhao, Zizu et al

(2006)

In this work, we demonstrate the feasibility of fully-Lagrangian finite element simulations of the mechanics of three-dimensional penetration environments. The key enabling component is a robust library ... [more ▼]

In this work, we demonstrate the feasibility of fully-Lagrangian finite element simulations of the mechanics of three-dimensional penetration environments. The key enabling component is a robust library informed with state-of-the-art algorithms for mesh healing and optimization, which is repeatedly used during the simulations to eliminate deformation-induced mesh distortion and to maintain the quality of the numerical solution. The computational strategy effectively avoids the need to resort to artifacts such as element deletion or conversion to meshless particles which have been proposed to eliminate the issue of mesh distortion. The effectiveness of the computational strategy is demonstrated in a simulation of deep oblique penetration of a spherical-nosed steel rod on an aluminum target. [less ▲]

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See detailPrevalence and sources of Campylobacter spp. contamination in free-range broiler production in Belgium
Vandeplas, Sabrina ULg; Dubois Dauphin, Robin ULg; Beckers, Yves ULg et al

in World's Poultry Science Journal (2006), 62(supplément), 557

An one year epidemiological study was carried out between February 2005 and January 2006 in Belgium to assess the Campylobacter prevalence in free-range broiler production. Three successive broiler flocks ... [more ▼]

An one year epidemiological study was carried out between February 2005 and January 2006 in Belgium to assess the Campylobacter prevalence in free-range broiler production. Three successive broiler flocks on 6 belgian farms were investigated for the presence of Campylobacter ssp. during the rearing period. Each flock was visited four times, before and after the outdoor rearing period. During each visit, samples were taken in the broiler houses (litter, cecal droppings, water-lines, feed, entrance premises) as well as from the outer rearing environment (open-air range). Conventional microbiological methods combined with biochemical tests were used for the Campylobacter detection, species identification and isolation. Campylobacter prevalence was very high in free-range broiler production during the experimental period. C. jejuni is the main species isolated from all contaminated samples, while mixed C. jejuni/C. coli infections sometimes occured. Contamination of the broiler flocks was increased in summer/autumn, with a 100% flocks contamination, whereas only 4 (66.7%) and 3 (50%) of the flocks became Campylobacter positive in spring and winter respectively, at the end of the rearing period. Moreover, about 53.8% of contaminated flocks were infected with Campylobacter before chicks have access to the open-air range. In 69.2% of the Campylobacter-positive flocks, the open-air range soil belonged partly of fully to environmental samples found to be Campylobacter-positive before flock infection. The other potential sources of infection were delivery tray, entrance premises floor and water-lines. The access to an open-air range seems to be an important way of contamination of broilers because Campylobacter prevalence in the flocks increased after going out. [less ▲]

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See detailEtude longitudinale d'essais multilocaux: application à la comparaison d'un grand nombre d'objets
Brostaux, Yves ULg; Claustriaux, Jean-Jacques ULg

in Abdelguerfi, Aissa (Ed.) Workshop international "Diversité des fabacées fourragères et de leurs symbiotes: applications biotechnologiques, agronomiques et environnementales" (2006)

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See detailForms and functions of accentuation in Dutch, French, and English
Rasier, Laurent ULg

Conference (2006)

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See detailRobust structures by joint ductility
Kuhlmann, U.; Jaspart, Jean-Pierre ULg; Vassart, O. et al

in Proceedings of the IABSE Symposium on Responding to Tomorrows Challenges in Structural Engineering (2006)

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See detailReinforcement learning with raw image pixels as input state
Ernst, Damien ULg; Marée, Raphaël ULg; Wehenkel, Louis ULg

in Advances in machine vision, image processing & pattern analysis (Lecture notes in computer science, Vol. 4153) (2006)

We report in this paper some positive simulation results obtained when image pixels are directly used as input state of a reinforcement learning algorithm. The reinforcement learning algorithm chosen to ... [more ▼]

We report in this paper some positive simulation results obtained when image pixels are directly used as input state of a reinforcement learning algorithm. The reinforcement learning algorithm chosen to carry out the simulation is a batch-mode algorithm known as fitted Q iteration. [less ▲]

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See detailProposals for better seismic resistance masonry housing and validation by shaking table tests
Degée, Hervé ULg; Doneux, C. L.; Plumier, André ULg

in Proceedings of the National Conference on Theoretical and Applied Mechanics (2006)

This paper presents results of a research on the development of specific constructional details for non engineered masonry housing in low seismicity areas. It presents then an experimental investigation ... [more ▼]

This paper presents results of a research on the development of specific constructional details for non engineered masonry housing in low seismicity areas. It presents then an experimental investigation on shaking table aiming at validating the proposals made in the first part of the paper. [less ▲]

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See detailTARGETED ENERGY TRANSFERS AND SUPPRESSION OF AEROELASTIC INSTABILITIES
Lee, Young S; Vakakis, Alexander F.; Bergman, Lawrence A. et al

in 2nd International Conf. on NNMs and Localization in Vibrating Systems, Samos, 2006 (2006)

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See detailBiological Image Classification with Random Subwindows and Extra-Trees
Marée, Raphaël ULg; Geurts, Pierre ULg; Wehenkel, Louis ULg

Conference (2006)

We illustrate the potential of our image classification method on three datasets of images at different imaging modalities/scales, from subcellular locations up to human body regions. The method is based ... [more ▼]

We illustrate the potential of our image classification method on three datasets of images at different imaging modalities/scales, from subcellular locations up to human body regions. The method is based on random subwindows extraction and the combination of their classification using ensembles of extremely randomized decision trees. [less ▲]

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See detailGeneralized Expectation-Maximization segmentation of brain MR images
Devalkeneer, Arnaud A.; Robe, Pierre A.; Verly, Jacques ULg et al

Conference (2006)

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See detailMotivation, volition et performances universitaires chez des étudiants de première année en sciences psychologiques
Broonen, Jean-Paul ULg

Poster (2006)

A model explaining college performance is proposed where motivation, volition, and study strategies are combined as predictors. Mastery-approach goals are positive predictors and avoidance-goals negative ... [more ▼]

A model explaining college performance is proposed where motivation, volition, and study strategies are combined as predictors. Mastery-approach goals are positive predictors and avoidance-goals negative predictors of volitional control intentions of effort. These intentions are positive predictors of endorsement of study strategies intentions. The last ones and intentions of voltional control of effort are positive antecedents of corresponding behaviours, which positively predict exam performances [less ▲]

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See detailDifférents traitements de la graine de lin dans le cadre de l'engraissement de vaches de réforme.
Cabaraux, Jean-François ULg; Dotreppe, Olivier ULg; Dufrasne, Isabelle ULg et al

in 13ième Rencontres autour des Recherches sur les Ruminants (2006)

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See detailInterleukin-6 mediates subchondral osteoblasts-induced cartilage degradation
Sanchez, Christelle ULg; Kaut, Elizabeth; DEBERG, Michelle ULg et al

Conference (2006)

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See detailEEG inverse problem and priors in a brain-computer interface
Noirhomme, Quentin ULg; Macq, B.

in Proceedings of the 11-th International Conference Speech and Computer, SPECOM'2006 (2006)

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See detailEffect of sampling method and culture conditions on the result of fungal culture in the diagnosis of canine sino-nasal aspergillosis.
Legarrérès, A.; Clercx, Cécile ULg; Mignon, Bernard ULg et al

in Proceedings of the 24th VCRS meeting (2006)

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See detailStress constrained optimization using X-FEM and Level-Set description
Van Miegroet, Laurent ULg; Jacobs, Thibault; Lemaire, Etienne ULg et al

in Proceedings of III European Conference on Computational Mechanics. Solids, Structures and Coupled Problems in Engineering (2006)

This paper presents and describes an intermediate approach which takes its place between the two classical methods of shape and topology optimization. It is based on using the recent Level Set description ... [more ▼]

This paper presents and describes an intermediate approach which takes its place between the two classical methods of shape and topology optimization. It is based on using the recent Level Set description of the geometry and the novel eXtended Finite Element Method (X-FEM). The method benefits from the fixed mesh work using X-FEM and from the curves smoothness of the Level Set description. Design variables are shape parameters of basic geometric features. The number of design variables of this formulation remains small whereas various global and local constraints can be considered. A key problem which is investigated here is the sensitivity analysis and the way it can be carried out precisely and efficiently. Numerical applications revisit some classical 2D (academic) benchmarks from shape optimization and illustrate the great interest of using X-FEM and Level Set description together. The paper presents the results of stress constrained problems using the proposed X-FEM and Level Set based formulation. A central issue is the sensitivity analysis (related to the compliance and/or the stresses) and the way it can be carried out efficiently. A special attention is also paid to stress constrained problems which are often neglected in other Level Set Methods works. [less ▲]

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See detailMorphological variability of some Devonian miospores
Breuer, P.; Filatoff, J.; Steemans, Philippe ULg

in Palaeozoic palynology in space and time. CIMP general meting (2006)

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See detailSegment and combine: a generic approach for supervised learning of invariant classifiers from topologically structured data
Geurts, Pierre ULg; Marée, Raphaël ULg; Wehenkel, Louis ULg

in Proceedings of the Machine Learning Conference of Belgium and The Netherlands (Benelearn) (2006)

A generic method for supervised classification of structured objects is presented. The approach induces a classifier by (i) deriving a surrogate dataset from a pre-classified dataset of structured objects ... [more ▼]

A generic method for supervised classification of structured objects is presented. The approach induces a classifier by (i) deriving a surrogate dataset from a pre-classified dataset of structured objects, by segmenting them into pieces, (ii) learning a model relating pieces to object-classes, (iii) classifying structured objects by combining predictions made for their pieces. The segmentation allows to exploit local information and can be adapted to inject invariances into the resulting classifier. The framework is illustrated on practical sequence, time-series and image classification problems. [less ▲]

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See detailAgriculture in Belgium : main characteristics and problems
Burny, Philippe ULg

in Lorencowicz, Edmund (Ed.) International Scientific Seminar "Farm machinery management in sustainable agriculture" : Seminar Proceedings (2006)

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See detailLes grandes lignes de l'interprétation heideggérienne de la monadologie
Pieron, Julien ULg

in M. S. Alves, Pedro; Santos, José Manuel; Sá, Alexandre Franco de (Eds.) Humano e Inumano. A Dignidade do Homem e os Novos Desafios (Actas do Segundo Congresso Internacional da Associação Portuguesa de Filosofia Fenomenológica) (2006)

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See detailÉtiquettes de médicaments, listes de drogues, prescriptions et réceptaires dans l'Égypte gréco-romaine et byzantine
Marganne, Marie-Hélène ULg

in Collard, Franck; Samana, Evelyne (Eds.) Pharmacopoles et apothicaires. Les "pharmaciens" de l'Antiquité au Grand Siècle (2006)

Survey of the greek papyri with drugs'names, lists of drugs, prescriptions and receptaries in Graeco-Roman and Byzantine Egypt

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See detailMaternal stress markers during pregnancy
Tsubouchi, Hiroaki; Shimoya, Koichiro; Song, Myhion et al

Poster (2006)

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See detailThe Mesolithic of the Belgian Ardennes
Otte, Marcel ULg; Noiret, Pierre ULg

in Kind, Claus-Joachim (Ed.) After the Ice Age. Settlements, subsistence and social development in the Mesolithic of Central Europe (2006)

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See detailEffects of MMP inhibition on emphysema development, Inflammation induced by cadmium in rats
Fievez, Laurence ULg; Kirschvinck, N.; Belleflamme, M. et al

in IUPHAR Congress, Pékin Japon, juillet 2006 (2006)

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See detailNumerical study of the fatigue crack in welded beam-to-column connection using cohesive zone model
Lequesne, Cédric ULg; Plumier, André ULg; Degée, Hervé ULg et al

in Proceedings of the International Conference on Fracture and Damage Mechanics V (2006)

The fatigue behaviour of the welded beam-to-column connections of steel moment resisting frame in seismic area must be evaluated. The cohesive zone model is an efficient solution to study such connections ... [more ▼]

The fatigue behaviour of the welded beam-to-column connections of steel moment resisting frame in seismic area must be evaluated. The cohesive zone model is an efficient solution to study such connections by finite elements. It respects the energetic conservation and avoids numerical issues. A three-dimensional cohesive zone model element has been implemented in the home made finite element code Lagamine [1]. It is coupled with the fatigue continuum damage model of Lemaître and Chaboche [2]. The cohesive parameters are identified by the inverse method applied on a three points bending test modelling. [less ▲]

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See detailLe traitement de l'hypertension artérielle prévient-il la démence?
Krzesinski, Jean-Marie ULg

in Louvain Medical (2006), 125(6), 198-202

Chronic arterial hypertension plays a certain role in the cognitive function decline and dementia, particularly Alzheimer's disease, through vascular lesions added to the degenerative injuries. When ... [more ▼]

Chronic arterial hypertension plays a certain role in the cognitive function decline and dementia, particularly Alzheimer's disease, through vascular lesions added to the degenerative injuries. When stroke occurs, it accelerates the development of dementia. By using antihypertensive drugs and correcting high blood pressure, the incidence of stroke has been dramatically reduced. Such treatment has also demonstrated protective efffect on stroke recurrence but also on cognitive dysfunction related to cerebrovascular complication. When severe cognitive dysfunction is present, the interest of antihypertensive treatment, its nature and the blood pressure target have not been clearly defined. An individual approach must be stimulated with an overall cardiovascular risk factors correction. [less ▲]

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See detailThe effects of attentional level and test format on the resistance to false memories.
Dehon, Hedwige ULg; Lampinen, James Michael

Poster (2006)

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See detailEffect of food intake levels on leptin and IGF-I plasma concentrations in sheep
Archa, Bouchaib; Bister, Jean-Loup; Colinet, Frédéric ULg et al

in Acta Physiologica (2006), 187(Suppl 651), 4

The effect of high (H) or low (L) levels of food intake, during the preceding 51 weeks, on leptin and Insulin-like growth factor-I (IGF-I) plasma concentrations in sheep were investigated in groups of 20 ... [more ▼]

The effect of high (H) or low (L) levels of food intake, during the preceding 51 weeks, on leptin and Insulin-like growth factor-I (IGF-I) plasma concentrations in sheep were investigated in groups of 20 adult Timahdite (non-lactating, non-pregnant) ewes. Ewes of the two treatments had similar liveweight at the start of study but there was a twofold difference in energy intake. All animals were maintained indoors under natural daylength conditions (33°53'N, 5°32'W). Blood samples were collected monthly and the statistical analyses were performed on leptin and IGF-I levels. The mean leptin plasma concentrations were higher in H ewes than L sheep (3.98±0.97 ng/ml vs 3.34±1.17 ng/ml, P<0.05). For IGF-I, from week 1 to 26, the mean plasma concentrations were higher in H ewes than L sheep (76±28 ng/ml vs 58±21 ng/ml, P<0.01). However, from week 31 to 51, the mean plasma concentrations were similar in both groups (57±24 ng/ml vs 59±25 ng/ml, P>0.05). It was concluded that the food intake levels affect significantly leptin and IGF-I plasma concentrations and consequently may be the link between food intake, body condition and reproductive performances in sheep. [less ▲]

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See detailThe roles of complexing agents in the sulfidisation and xanthate flotation of cobalt oxy hydroxides of copper-cobalt oxides ores from the Congolese Copperbelt
Bastin, David ULg; Frenay, Jean ULg; Vermaut, Norbert

Conference (2006)

Complex mineralogy combined with a variable chemistry lead to various flotation responses of cobalt oxy-hydroxides present in oxidised and mixed copper-cobalt stratiform deposits of the Central African ... [more ▼]

Complex mineralogy combined with a variable chemistry lead to various flotation responses of cobalt oxy-hydroxides present in oxidised and mixed copper-cobalt stratiform deposits of the Central African Copperbelt. Optimum metallurgical results require very high dosages of reagents and the management of such high chemicals concentrations in the pulp at the plant scale is delicate. The transition period between high reducing conditions during the sulfidisation step and a more oxidising environment prevailing during collector adsorption is particularly critical. This paper demonstrates how the use of copper and cobalt complexing agents can significantly improve the process control and metallurgical performance. The different modes of action of these reagents are presented and mechanisms for the various reactions proposed. Plant results following the introduction of ammonium sulfate at the New Concentrator of Kipushi are discussed. [less ▲]

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See detailGenerating Dicke states with photodetector arrays in trapped ions
Thiel, C.; von Zanthier, J.; Bastin, Thierry ULg et al

Poster (2006)

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See detailQuasi steady-state simulation diagnosis using Newton method with optimal multiplier
Rousseaux, Patricia ULg; Van Cutsem, Thierry ULg

in IEEE PES General Meeting (Montreal) (2006)

This paper deals with the quasi steady-state approximation of the long-term dynamics. This fast time simulation method assumes that the short-term dynamics are stable and can be replaced by their ... [more ▼]

This paper deals with the quasi steady-state approximation of the long-term dynamics. This fast time simulation method assumes that the short-term dynamics are stable and can be replaced by their equilibrium equations. When the latter stop having a solution, the simulation undergoes a singularity. This paper proposes a method to identify which component(s) are responsible for the loss of equilibrium. The corresponding equations are identified using the Newton method with optimal multiplier. The method has been validated with respect to full time simulation. Very good results are shown on the Nordic-32 system, in cases where long-term voltage instability triggers loss of synchronism. The proposed method enhances time simulation at very low computational cost and can also help correcting model and/or operating point errors. [less ▲]

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See detailALADDIN: an optimized ground-based precursor for DARWIN
Coudé du Foresto, Vincent; Absil, Olivier ULg; Barillot, Marc et al

in Aime, C.; Vakili, F. (Eds.) Direct Imaging of Exoplanets: Science & Techniques (2006)

The ALADDIN concept is an integrated Antarctic-based L-band experiment whose purpose is to demonstrate nulling interferometry and to prepare the DARWIN mission. Because of their privileged location, the ... [more ▼]

The ALADDIN concept is an integrated Antarctic-based L-band experiment whose purpose is to demonstrate nulling interferometry and to prepare the DARWIN mission. Because of their privileged location, the relatively modest collectors (1 m) and baseline (up to 40 m) are sufficient to achieve a sensitivity (in terms of detectable zodi levels) which is about twice better than that of a nulling instrument on a large interferometer (such as GENIE at the VLTI), and to reach the 20-zodi threshold value identified to carry out the DARWIN precursor science. These numbers are based on a preliminary design study by Alcatel Alenia Space and were obtained using the same simulation software as the one employed for GENIE. The integrated design enables top-level optimization and full access to the light collectors for the duration of the experiment, while reducing the complexity of the nulling breadboard. [less ▲]

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See detailHippocampal response at training promotes insight after sleep
Darsaud, Annabelle; Balteau, Evelyne ULg; Desseilles, Martin ULg et al

in NeuroImage (2006), 31(Suppl. 1),

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See detailPEGASE: a DARWIN/TPF pathfinder
Ollivier, M.; Le Duigou, J.-M.; Mourard, D. et al

in Aime, C.; Vakili, F. (Eds.) Direct Imaging of Exoplanets: Science & Techniques (2006)

The space mission PEGASE, proposed to the CNES (Centre National d'Etudes Spatiales = French Space Agency) in the framework of its call for scientific proposals : "formation flying missions", is a 2 ... [more ▼]

The space mission PEGASE, proposed to the CNES (Centre National d'Etudes Spatiales = French Space Agency) in the framework of its call for scientific proposals : "formation flying missions", is a 2-aperture interferometer, composed by 3 free flying satellites (2 siderostats and 1 beam combiner), allowing baselines from 50 to 500 m in both nulling and visibility modes. With an angular resolution of a few mas and a spectral resolution of several tens in the spectral range 2.5-5 microns, PEGASE has several goals:science : spectroscopy of hot jupiters (Pegasides) and brown dwarves, exploration of the inner part of protoplanetary diskstechnology : validation in real space conditions of formation flying, nulling and visibility interferometry concepts.PEGASE has been studied at a 0-level. In this paper, we summarize the scientific program and associated technological and mission trade-off coming from this 0-level study. We also discuss how PEGASE can be considered as a TPF/DARWIN pathfinder in an international roadmap towards more complex space interferometry missions such as DARWIN/TPF. [less ▲]

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See detailStrategy for the qualitative and quantitative analysis of crop syrup containing enzymatically produced Isomaltooligosaccharides known as emerging prebiotics
Goffin, Dorothée ULg; Blecker, Christophe ULg; Wathelet, Bernard ULg et al

Poster (2006)

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human ... [more ▼]

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human subjects, support the involvement of dietary oligosaccharides in physiological processes in the different intestinal cell type and also outside the gastrointestinal tract (e.g. hormone production, lipid and carbohydrate metabolism). IMOs consists of glucose monomers linked by at least one α-1-6, or in a lower proportion α -1-3 (nigerose family) or α -1-2 (kojibiose family) glucosidic linkages. In our case they are produced enzymatically from corn starch. It results in a very complex mixture with molecules characterized at the same time by their DP value (from 2 to ~20), linkages types (α-1-2, 3 or 6) and the proportion and position of each type of linkage (only α -1-6 or combined types). The challenge of this study was to find a qualitative and quantitative method to characterize the syrups. In a subsequent study, every unidentified peak could be determined by NMR or Mass spectrometry. Three different chromatographic methods have been tested and compared over their selectivity, sensibility, robustness, applicability and their quantitative power. The HPLC-RID (Refractive Index Detector) used with a Prevail Carbohydrate column (Alltech), adapted for carbohydrates with a certain value of DP, appear to be poorly selective due to the obligation of working in isocratic conditions. The HPLC-ELSD (Evaporating Light Scattering Detector) used with the same column gave a very good separation upon the DP as the Prevail accepts a wide range of solvant changing and even a separation of the different DP 2 molecules. The sensibility was also improved due to the stability of the baseline. The quantitative analysis is a bit more awkward due to the relatively limited linear portion of the calibration curve. High-performance Anion Exchange Chromatography coupled with Pulsed Amperometric Detection (HPAEC-PAD) appeared to deserve a special mention, since it provides selective separation and sensitive detection. In fact, this technique is the only chromatographic one to separate with effectiveness homologue molecules having a difference only in their DP (up to high DPs) or linkage types. This is due to the separation mode based on the difference in ionic force of the sugars in alkaline conditions (mainly due to the DP and the structure of the molecule). However, during the detection, the electrochemical behavior of carbohydrates can be affected by molecular weight as well as by structural differences giving rise to different response factors; as a consequence, HPAEC-PAD is not generally considered as suitable for quantitative studies of complex mixtures of oligosaccharides. In this work a methodological approach is presented in order to get a quantitative response through a rigorous methodology for our IMOs. It also opens the way to the theoretical determination of the response factor for the homologue molecules in relation with their structure and DP. [less ▲]

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See detailRange-dependence Issues in Multistatic STAP-based Radar
Neyt, Xavier; Acheroy, Marc; Verly, Jacques ULg

Conference (2006)

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See detailFrom Expository Teaching to First e-Learning Course Production: Capture in a 17 Online Course Sample of a Pedagogical Pattern Facilitating Transition
Verpoorten, Dominique ULg; Poumay, Marianne ULg; Delcomminette, Séverine ULg et al

in Advanced Learning Technologies (2006)

This paper discusses an activity structure, RQAT, mined from a study of 17 on-line courses. It formats this structure as a pedagogical pattern and presents it as an abstraction to support staff ... [more ▼]

This paper discusses an activity structure, RQAT, mined from a study of 17 on-line courses. It formats this structure as a pedagogical pattern and presents it as an abstraction to support staff development, especially faculty willing to incorporate first online components to enhance face to face courses. [less ▲]

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See detailInvestigation on the Delay Time of Coal Experiment by Laser-induced Breakdown Spectroscopy
Li, Jie ULg; Lu, Jidong; Xie, Chengli et al

Conference (2006)

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See detailAntireflective subwavelength patterning of IR optics
Vandormael, Denis; Habraken, Serge ULg; Loicq, Jerôme ULg et al

in Proceedings of SPIE (2006), 6395

Thermal infrared (IR) lenses require efficient anti-reflection coating. Moth-eye (or egg-box) 2D subwavelength gratings have demonstrated their ability to reach a very high transmission for a wide ... [more ▼]

Thermal infrared (IR) lenses require efficient anti-reflection coating. Moth-eye (or egg-box) 2D subwavelength gratings have demonstrated their ability to reach a very high transmission for a wide wavelength and angular range. The use in thermal IR is simplified by the lower resolution for lithographic technology, compared to visible waveband. However, deeper structures must be engraved and lithography must be adapted to IR materials. In order to be cost-effective, the patterning must be produced by replication techniques, such as embossing. Our laboratory is now experimenting hot embossing of moth-eye patterns in chalcogenide substrates. In this paper, theoretical analysis, micro-lithographic technology and manufacturing processes are detailed. [less ▲]

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See detailEU policy applied to the Walloon region
Burny, Philippe ULg

Conference (2006)

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See detailGenomic structure of new Peach Mosaic viroid variants in Tunisia
Fekih Hassen, I.; Massart, Sébastien ULg; Kummert, J. et al

Poster (2006)

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See detailInvestigation of interactions between phospholipids, cholesterol and surfactin by atomic force microscopy and differential scanning calorimetry
Eeman, Marc; Nylander, Tommy; Dufrêne, Yves et al

Poster (2006)

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See detailCloning of CONSTANS and FLOWERING LOCUS T in Sinapis alba.
Tamseddak, Karim; D'Aloia, Maria ULg; Périlleux, Claire ULg

in Comparative Biochemistry & Physiology Part A : Molecular & Integrative Physiology (2006), 143A

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See detailAnalytic properties of unitarization schemes
Selyugin, Oleg Viktorovich; Cudell, Jean-René ULg

in Czechoslovak Journal of Physics (2006)

The analytic properties of the elastic hadron scattering amplitude are examined in the impact parameter representation at high energies. Different unitarization procedures and the corresponding non-linear ... [more ▼]

The analytic properties of the elastic hadron scattering amplitude are examined in the impact parameter representation at high energies. Different unitarization procedures and the corresponding non-linear equations are presented. Several unitarisation schemes are presented. They lead to almost identical results at the LHC. [less ▲]

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See detailOut-of-plane displacement derivative measurement: comparison of results obtained by a shearographic interferometer using the separation of the polarization states and the finite element method
Rosso, Vanessa; Zhang, Lihong ULg; Michel, Fabrice ULg et al

in Mathieu, P. (Ed.) Proceedings of Photonics North Conference 2006 (2006)

An original experimental setup for shearography with metrological applications is presented herein. The simplicity and the efficiency of the setup are provided by a shearing device, a prism that separates ... [more ▼]

An original experimental setup for shearography with metrological applications is presented herein. The simplicity and the efficiency of the setup are provided by a shearing device, a prism that separates the TE and TM polarization modes with a coating and a thin glass plate attached on its face. The temporal phase shifting method is applied through the use of a liquid crystal variable retarder. The use of this shearing device enables an in-line and almost-common path configuration for the shearing interferometer, a path that leads to high stability of the interferometer and a low sensitivity to external disturbances. In order to prove the efficiency and the accuracy of this speckle shearing interferometer, the out-of-plane displacement derivative relative to the shearing interferometry direction of a centrally loaded steel plate has been measured by the shearographic interferometer and then compared with the out-of-plane displacement derivative computed from the displacement field provided by the finite element method. The results are in good agreement. [less ▲]

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See detailStrategy for DR-CALUX dioxin screening in feed under EC regulation
Scippo, Marie-Louise ULg; Rybertt, M. S.; Eppe, Gauthier ULg et al

in Organohalogen Compounds (2006), 68

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See detailSelenized fertilizers: effects on locally produced feedstuffs, on suckling cows and on beef meat
Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg; Dotreppe, Olivier ULg et al

in Proceedings of the 8th International Symposium on Selenium in Biology and Medecine (2006)

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See detailEffect of water intake of dietary mannitol, sodium chloride and foot frequency in healthy cats
Kirschvinck, N.; Lhoest, E.; Leemans, Jérôme ULg et al

in Proceedings: 10th Congress of the European Society of Veterinary and Comparative Nutrition (2006)

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See detailÉcritures masculines d’un héroïsme au féminin : portrait moderne d’une mystique médiévale
Henneau, Marie-Elisabeth ULg

in Alémany, Véronique; Cottret, Monique; Cottret, Bernard (Eds.) Saintes ou sorcières? L'héroïsme chrétien au féminin (2006)

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See detailAchromatic optical vortex coronagraph with subwavelength gratings
Mawet, Dimitri ULg; Riaud, Pierre ULg; Baudrand, J. et al

in Proceedings of the Coronagraph Workshop (2006)

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See detailElasto-plastic material parameter identification by inverse methods: sensitivity matrix calculation
Cooreman, Steven; Bouffioux, Chantal ULg; Lecompte, David et al

in Proceedings of the SEM annual conference and exposition 2006 (2006)

Inverse methods offer a powerful tool for the determination of the elasto-plastic material properties. Contrary to standard tests, these methods can deal with heterogeneous stress and strain-fields which ... [more ▼]

Inverse methods offer a powerful tool for the determination of the elasto-plastic material properties. Contrary to standard tests, these methods can deal with heterogeneous stress and strain-fields which have a larger information contents and hence allow the simultaneous identification of several material parameters. Moreover, it is expected that the obtained material parameters are more accurate, since these heterogeneous deformation fields are much closer to those occurring in real (metal) forming operations. The principle of the inverse method for the identification of material parameters presented in this paper is to compare an experimentally measured strain field to that computed by a Finite Element (FE) model. The material parameters in the FE model are iteratively tuned in such a way that both strain fields match each other as close as possible. One of the building blocks in this identification procedure is the updating algorithm for the material parameters in the FE model. The key problem of this updating algorithm is the determination of the sensitivity matrix, which expresses the sensitivities of the strains with respect to the material parameters. This paper presents an analytical method for the calculation of this sensitivity matrix in case of simple tensile tests. [less ▲]

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See detailGALOCAD : GALileo LOcal Component for nowcasting and forecasting Atmospheric Disturbances
Warnant, René ULg; Kutiev, Ivan; Jodogne, Jean-Claude et al

Conference (2006)

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See detailMemory span and Down’s syndrome: A study of the developmental specificities
Frenkel, Stéphanie ULg; Bourdin, Béatrice; Vandromme, Luc

Conference (2006)

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See detailRole of Sox 10 in the development of the inner ear
Bodson, M; Breuskin, I; Thelen, Nicolas ULg et al

Poster (2006)

Detailed reference viewed: 6 (2 ULg)