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See detailCalitatea lucernei sub influenţa fertilizării în condiţiile din silvostepa Moldovei
Stavarache, Mihai; Vîntu, Vasile; Samuil, Costel et al

in Ţenu, Ioan; Vîntu, Vasile; Jităreanu, Gerard (Eds.) Durable Agriculture and Food Security – Priority objectives in research activity of the Ph.D. students from the UASVM Iasi (2012, December 07)

The research conducted during 2011-2012, on the Ezăreni farm, has sought influence of fertilization on the leaves/stems ratio, crude protein content (CP), neutral detergent fiber content (NDF), acid ... [more ▼]

The research conducted during 2011-2012, on the Ezăreni farm, has sought influence of fertilization on the leaves/stems ratio, crude protein content (CP), neutral detergent fiber content (NDF), acid detergent fiber content (ADF) and relative feed value (RFV), of alfalfa (Medicago sativa L.) in the second and third year of vegetation, at the first cut. The studied experimental plots were v1- unfertilized (control plot), v2-N50P50, v3-N75P50 and v4-30 t/ha manure). The results showed that the fertilization negatively affected crude protein content of plants. Although the protein content of leaves was higher and that of strains was less affected, the leaves/stems ratio decided this indicator for plant production. Organic fertilization showed a highly significant positive effect on the content of plant leaves and stems in NDF and ADF. [less ▲]

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See detailINFLUENCE OF MYELOPEROXIDASE ACTIVITY ON EQUINE POST-THAW SEMEN QUALITY
Ponthier, Jérôme ULg; Franck, Thierry ULg; Parrilla Hernandez, Sonia ULg et al

in Edeas, Marvin (Ed.) Proceedings of the 2nd ISANH World congress on Fertility and Antioxidants (2012, December 06)

This study confirms that active MPO is associated with cellular fraction of the ejaculate, as previously suggested for total MPO concentration in thawed semen (2). However, active MPO concentrations were ... [more ▼]

This study confirms that active MPO is associated with cellular fraction of the ejaculate, as previously suggested for total MPO concentration in thawed semen (2). However, active MPO concentrations were dramatically lower than total MPO concentrations observed in equine semen (3), which could be explained by presence of inactive MPO subunits in semen. MPO activity in sperm-rich pellet can be used as a predictive marker of post-thaw semen quality. Moreover, methods to inhibit MPO should be investigated in semen. [less ▲]

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See detailHydrodynamique et Architecture Navale
Hage, André; Rigo, Philippe ULg; Lapy, Matthieu ULg

in Journées scientifiques et techniques du CETMEF 2012 (2012, December 05)

State of art en matière d'hydrodynamique navale et architecture navale pour la navaigatio nfluviale

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See detailSignatures of rotation in oscillation spectra
Reese, Daniel ULg; Prat, V.; Barban, C. et al

in Boissier, S.; de Laverny, P.; Nardetto, N. (Eds.) et al SF2A-2012: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics (2012, December 01)

Rotation makes oscillation spectra of rapidly rotating stars much more complicated. Hence, new strategies need to be developed in order to interpret such spectra. In what follows, we describe how multi ... [more ▼]

Rotation makes oscillation spectra of rapidly rotating stars much more complicated. Hence, new strategies need to be developed in order to interpret such spectra. In what follows, we describe how multi-colour photometric mode visibilities can be generalised to rapidly rotating stars, while fully taking into account centrifugal deformation and gravity darkening. We then go on to describe some first results as well as a strategy for constraining mode identification. [less ▲]

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See detailKick synchronization versus diffusive synchronization
Mauroy, Alexandre ULg; Sacré, Pierre ULg; Sepulchre, Rodolphe ULg

in Proceedings of the 51st IEEE Conference on Decision and Control (2012, December)

The paper provides an introductory discussion about two fundamental models of oscillator synchronization: the (continuous-time) diffusive model, that dominates the mathematical literature on ... [more ▼]

The paper provides an introductory discussion about two fundamental models of oscillator synchronization: the (continuous-time) diffusive model, that dominates the mathematical literature on synchronization, and the (hybrid) kick model, that accounts for most popular examples of synchronization, but for which only few theoretical results exist. The paper stresses fundamental differences between the two models, such as the different contraction measures underlying the analysis, as well as important analogies that can be drawn in the limit of weak coupling. [less ▲]

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See detailValidated Extraction of Gait Events from 3D Accelerometer Recordings
Boutaayamou, Mohamed ULg; Schwartz, Cédric ULg; Stamatakis, Julien et al

in IEEE International Conference on 3D Imaging (IC3D) (2012, December)

This work is part of a project that deals with the three-dimensional (3D) analysis of normal and pathological gaits based on a newly developed system for clinical applications, using low-cost wireless ... [more ▼]

This work is part of a project that deals with the three-dimensional (3D) analysis of normal and pathological gaits based on a newly developed system for clinical applications, using low-cost wireless accelerometers and a signal processing algorithm. This system automatically extracts relevant gait events such as the heel strikes (HS) and the toe-offs (TO), which characterize the stance and the swing phases of walking. The performances of the low-cost accelerometer hardware and related algorithm have been compared to those obtained by a kinematic 3D analysis system and a force plate, used as gold standard methods. The HS and TO times obtained from the gait data of 7 healthy volunteers (147 trials) have been found to be (mean ± standard deviation) 0.42±7.92 ms and 3.11±10.08 ms later than those determined by the force plate, respectively. The experimental results demonstrate that the new hardware and associated algorithm constitute an effective low-cost gait analysis system, which could thus be used for the assessment of mobility in routine clinical practice. [less ▲]

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See detailAntiwindup regulation of saturated linear systems
Forni, Fulvio ULg; Zaccarian, Luca; Sepulchre, Rodolphe ULg

in 51st IEEE Conference on Decision and Control (2012, December)

We consider the output regulation problem for linear systems subject to actuators saturation. A state-feedback unconstrained regulator is transformed into an error-feedback bounded regulator by ... [more ▼]

We consider the output regulation problem for linear systems subject to actuators saturation. A state-feedback unconstrained regulator is transformed into an error-feedback bounded regulator by introducing an observer which is then decomposed into the sum of "unconstrained" and "antiwindup" dynamics. The unconstrained dynamics are regulated towards a predefined reference trajectory, by a control signal u which may violate the saturation bounds during transients. The antiwindup dynamics transiently store the mismatch between unconstrained and constrained dynamics. The antiwindup design also applies to a predefined error-feedback dynamic regulator for the unconstrained system, as in standard antiwindup setting. As a particular case of distinct interest, the design provides a new global asymptotic stabilizer for saturated null-controllable systems. [less ▲]

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See detailÉtude comparative de la répartition des matières et des apprentissages en langues anciennes dans l’enseignement francophone européen
Pietquin, Paul ULg

in Dufays, J.-L.; Carlier, Gh.; De Kesel, Myriam (Eds.) et al Progression et transversalité. Comment (mieux) articuler les apprentissages dans les disciplines scolaires ? (2012, December)

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See detailCarrying capacity of stainless steel columns in the low slenderness range
Rossi, Barbara ULg; Rasmussen, Kim J.R.

in 6th International Conference on Coupled Instabilities in Metal Structures : CIMS, Glasgow 3-5 December 2102 (2012, December)

In European standards, for Class 4 cross-sections, the Effective Width Method (EWM) must be used to account for the effect of local buckling. Because of the complexity of this method, other methods have ... [more ▼]

In European standards, for Class 4 cross-sections, the Effective Width Method (EWM) must be used to account for the effect of local buckling. Because of the complexity of this method, other methods have been developed, such as the Direct Strength Method (DSM) for cold-formed thin-walled profiles and the Continuous Strength Method (CSM), initially established for members made of stainless steels. To a large extent, the CSM yield accurate predictions, especially in the low slenderness range where the current DSM design procedure tends to produce conservative results, for materials with pronounced strain hardening. The present paper presents an extension of the DSM which provides accurate strength predictions in the low slenderness range for stainless steel thin-walled section columns failing by distortional, local and overall buckling. [less ▲]

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See detailQuantifying and Mitigating IGMP Filtering in Topology Discovery
Marchetta, Pietro; Mérindol, Pascal; Donnet, Benoît ULg et al

in IEEE Global Communications Conference (GLOBECOM) (2012, December)

Recent developments in router level topology discovery have suggested the introduction of IGMP probing in addition to standard techniques such as traceroute and alias resolution. With a single IGMP probe ... [more ▼]

Recent developments in router level topology discovery have suggested the introduction of IGMP probing in addition to standard techniques such as traceroute and alias resolution. With a single IGMP probe, one can obtain all multicast interfaces and links of a multicast router. If such a probing is a promising approach, we noticed that IGMP probes are subject to filtering, leading so to the fragmentation of the collected multicast graph into several disjoint connected components. In this paper, we cope with the fragmentation issue. Our contributions are threefold: (i) we experimentally quantify the damages caused by IGMP filtering on collected topologies of large tier-1 ISPs; (ii) using traceroute data, we construct a hybrid graph and estimate how far each IGMP fragment is from each other; (iii) we provide and experimentally evaluate a recursive approach for reconnecting disjoint multicast components. The key idea of the third contribution is to recursively apply alias resolution to reassemble disjoint fragments and, thus, progressively extend the mapping of the targeted ISP. Data presented in the paper, as well as reconstructed topologies, are freely available at http://svnet.u-strasbg.fr/merlin. [less ▲]

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See detailI-see-3D! An Interactive and Immersive System that dynamically adapts 2D projections to the location of a user’s eyes
Pierard, Sébastien ULg; Pierlot, Vincent ULg; Lejeune, Antoine ULg et al

in International Conference on 3D Imaging (IC3D) (2012, December)

This paper presents a system that gives the illusion of a 3D immersive and interactive environment with 2D projectors. The user does not need to wear glasses, nor to watch a (limited) screen. The virtual ... [more ▼]

This paper presents a system that gives the illusion of a 3D immersive and interactive environment with 2D projectors. The user does not need to wear glasses, nor to watch a (limited) screen. The virtual world is all around him, drawn on the floor. As the user is himself immersed in the virtual world, there is no need for a proxy like an avatar; he can move inside the virtual environment freely. Moreover, the Isee-3D system allows a user to manipulate virtual objects with his own body, making interactions with the virtual world very intuitive. Giving the illusion of 3D requires to render images insuch a way that the deformation of the image projected on thefloor is taken into account, as well as the position of the user’s “eye” in its virtual world. The resulting projection is neither perspective nor orthographic. Nevertheless, we describe how thiscan be implemented with the standard OpenGL pipeline, without any shader. Our experiments demonstrate that our system is effective in giving the illusion of 3D. Videos showing the results obtained with our I-see-3D system are available on our website http://www.ulg.ac.be/telecom/projector [less ▲]

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See detailRéduction des troubles électrolytiques chez les prématurés <1250g
SENTERRE, Thibault ULg

in Storme, laurent (Ed.) Livres des communications. 18ème Journées Francophones de Recherche en Néonatologie (2012, December)

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See detailMorpho-structural analysis and mass movements Case study of Oued El Kaïm reservoir dam Nort-East Algeria
Draidia, Salah ULg; Havenith, Hans-Balder ULg; Benabbas, Chaouki

in Annual International Conference on Geological & Earth sciences_GEOS-2013 (2012, December)

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See detailParametric numerical study of seismic slope stability and verification of the Newmark method
Torgoev, Almazbek ULg; Havenith, Hans-Balder ULg

in Ugai, K; Wakai, A; Yagi, H (Eds.) Proceedings of the International Symposium on Earthquake-induced landslides, Kiryu, Japan, 2012 (2012, December)

2D dynamic modelling of seismic slope stability is applied to a landslide-prone area in Central Asia, the Mailuu-Suu Valley, situated in the south of Kyrgyzstan. The calculations are made with models ... [more ▼]

2D dynamic modelling of seismic slope stability is applied to a landslide-prone area in Central Asia, the Mailuu-Suu Valley, situated in the south of Kyrgyzstan. The calculations are made with models constructed from over 30 profiles located in the target area, presenting different geological, tectonic and morphological settings. One part of the profiles were selected within landslide zones, the other part was selected in stable areas. Many of the landslides are complex slope failures involving falls, rotational sliding and/or planar sliding and flows. These input data were extracted from a 3D structural geological model built with the GOCAD software. Geophysical and geomechanical parameters were defined on the basis of results obtained by multiple surveys performed in the area over the past 15 years. These include geophysical investigation, seismological experiments and ambient noise measurements. Dynamic modelling of slope stability is performed with the UDEC version 4.01 software that is able to compute deformation of discrete elements. Inside these elements both elasto-plastic and purely elastic materials (similar to rigid blocks) were tested. Various parameter variations were tested to assess their influence on the final outputs. For a few models groundwater flow is included. The total parametric study involved more than 100 different models (about 800 computation hours). [less ▲]

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See detailThe usefulness of CPTs for deterministic, spatially heterogeneous, large-scale aquitard parametrisation
Rogiers, Bart; Mallants, Dirk; Batelaan, Okke et al

in Oswald, S.E.; Kolditz, O.; Attinger, S. (Eds.) Models - Repositories of Knowledge (2012, December)

Aquitards can be effectively parameterised and incorporated in a groundwater flow model by using standard cone penetration tests (CPTs). Several conceptually different realizations of an aquitard’s ... [more ▼]

Aquitards can be effectively parameterised and incorporated in a groundwater flow model by using standard cone penetration tests (CPTs). Several conceptually different realizations of an aquitard’s hydraulic conductivity field were evaluated based on: (i) conventional methods of soil behaviour type classification, (ii) recent relationships from the literature, and (iii) novel site-specific relations with hydraulic conductivity. We show that use of most of these CPT-based hydraulic conductivity estimations in groundwater flow modelling effectively enhance model performance based on absolute head values and gradients across the aquitard. Conceptual models that considered a spatially heterogeneous hydraulic conductivity for the aquitard performed better than the reference case with a uniform aquitard hydraulic conductivity. However, the hydraulic conductivity of thin heavy clay lenses, characteristic of the aquitard present in our study area, cannot be captured using these continuum approaches. The latter leads to a bias in the direct hydraulic conductivity predictions; an alternative is to invoke inverse modelling with the heterogeneous parameter fields. To address this issue, the concept of the boundary energy associated with the CPT signal is also introduced for characterising the presence of heavy clay lenses. Overall, the CPT-based concepts provide more accurate, robust, and high-resolution data-based parameterisation of the studied aquitard. [less ▲]

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See detailPolarization Holography with liquid crystals polymers and applications
Piron, Pierre ULg; Blain, Pascal ULg; Habraken, Serge ULg et al

in International Conference on Fibre Optics and Photonics (2012, December)

Liquid Crystals Polymers are birefringent molecules locally orientable. By recording the polarization pattern due to the overlap of differently polarized beams on LCP, space-variant retarders are realized ... [more ▼]

Liquid Crystals Polymers are birefringent molecules locally orientable. By recording the polarization pattern due to the overlap of differently polarized beams on LCP, space-variant retarders are realized. We present two applications polarization holography and coronagraphy. [less ▲]

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See detailA Review of Recent Case Studies of Landslides Investigated in the Tien Shan Using Microseismic and Other Geophysical Methods
Torgoev, Almazbek ULg; Lamair, Laura ULg; Torgoev et al

in Ugai, K; Wakai, A; Yagi, H (Eds.) Proceedings of the International Symposium on Earthquake-induced landslides (2012, December)

This paper reviews recent case studies completed on landslides (and dams) with probable (post-) seismic origin or susceptible to seismic failure in the Tien Shan, Central Asia. The first investigation ... [more ▼]

This paper reviews recent case studies completed on landslides (and dams) with probable (post-) seismic origin or susceptible to seismic failure in the Tien Shan, Central Asia. The first investigation presented here was carried out in 2005 on the Kainama earthflow, mainly composed of loess, which occurred in April 2004 and killed 33 people. Geophysical and seismological were used to build a reliable 3D model of the geometry and properties of the subsurface layers. The paper will also present results from microseismic measurements on loess landslides in Tajikistan that partly have a seismic origin. They are located close to the area that was affected in 1949 by the M=7.4 Khait earthquake and the numerous landslides triggered during the event, including the Khait rock avalanche. [less ▲]

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See detailThe rabbit left ventricle modeling at the cellular scale: application to flow-clamp experiments
Kosta, Sarah ULg; Pironet, Antoine ULg; Dauby, Pierre ULg

in Proceedings of the 11th Belgian National Day on Biomedical Engineering (2012, December)

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See detailInsulin clearance during hyper-insulinemia euglycemia therapy
Penning, Sophie ULg; MASSION, Paul ULg; Pretty, Christopher ULg et al

in Proceedings of the 11th Belgian Day on Biomedical Engineering (2012, December)

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See detailL'eLearning et les femmes : retour d'expérience. Une étude exploratoire auprès de 22 femmes
Lesire, Catherine ULg; Géron, Stéphanie ULg; Georges, François ULg

in Paliard, C.; Nkambou, R.; Narce, C. (Eds.) et al Actes du 8ème Colloque Technologies de l’Information et de la Communication pour l’Enseignement: Intégration Technologique et Nouvelles Perspectives d’Usage (2012, December)

Who are the women who learn online ? Why and in which circumstances have they chosen to learn online ? Have they taken advantage of this experience ? In this article, we speak about the exploratory survey ... [more ▼]

Who are the women who learn online ? Why and in which circumstances have they chosen to learn online ? Have they taken advantage of this experience ? In this article, we speak about the exploratory survey carried out with 22 women to know their motivation in online courses, what they did during those courses and what they remember of their experience. We also wanted to know whether eLearning gave women the opportunity to learn and to be trained even when they have a lot of responsabilities and sometimes little time to learn. [less ▲]

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See detailModel-based glycemic control in critical care
Pretty, Christopher ULg; Penning, Sophie ULg; Le Compte, Aaron J. et al

in Proceedings of the 11th Belgian Day on Biomedical Engineering (2012, December)

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See detailOptimal discovery with probabilistic expert advice
Bubeck, Sébastien; Ernst, Damien ULg; Garivier, Aurélien

in Proceedings of the 51st IEEE Conference on Decision and Control (CDC 2012) (2012, December)

Motivated by issues of security analysis for power systems, we analyze a new problem, called optimal discovery with probabilistic expert advice. We address it with an algorithm based on the optimistic ... [more ▼]

Motivated by issues of security analysis for power systems, we analyze a new problem, called optimal discovery with probabilistic expert advice. We address it with an algorithm based on the optimistic paradigm and the Good-Turingmissing mass estimator. We show that this strategy attains the optimal discovery rate in a macroscopic limit sense, under some assumptions on the probabilistic experts. We also provide numerical experiments suggesting that this optimal behavior may still hold under weaker assumptions. [less ▲]

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See detailCréation d'un outil d'évaluation de la durabilité des productions de qualité différenciée en Wallonie
Picron, Pascale ULg; Boudry, Christelle ULg; Lagneaux, Séverine et al

in 12ème Journée d'étude des productions porcines et avicoles (2012, November 28)

L’objectif de cette étude est de comparer simultanément l’impact environnemental, social et économique liés à l’application de différents critères de qualités différenciées. L’outil développé s’articule ... [more ▼]

L’objectif de cette étude est de comparer simultanément l’impact environnemental, social et économique liés à l’application de différents critères de qualités différenciées. L’outil développé s’articule autour de la modélisation des impacts environnementaux d’après la méthodologie ACV et s’appuie sur des matrices techniques (MT) pour l’évaluation sociale et économique. D’un point de vue opérationnel, il s’agit de développer un outil de simulation qui répond aux cahiers des charges minimaux de la qualité différenciée à travers le paramétrage réalisé par l’utilisateur final de l'application. Le modèle est implémenté dans l’environnement de programmation MATLAB R2011a (MathWorks, Natick, MA, USA). [less ▲]

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See detailExamen andrologique de l'étalon - Badanie andrologiczne ogiera
Ponthier, Jérôme ULg

in Gajewski, Zdzislaw (Ed.) Rosrod Koni II - wybrane problemy (2012, November 24)

QualityThe andrological examination is the main procedure to predict the breeding performance. It includes clinical examination as well as additionnal methods. The general health status, libido and the ... [more ▼]

QualityThe andrological examination is the main procedure to predict the breeding performance. It includes clinical examination as well as additionnal methods. The general health status, libido and the reproductive tract status has to be precisely evaluated. However, the final assessment has to be established trough the results of these analysis. [less ▲]

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See detailThe nuclear physics of OHe
Cudell, Jean-René ULg; Khlopov, Maxim; Wallemacq, Quentin ULg

in Mankoc (Ed.) Proceedings of the 15th Bled Workshop "What Comes Beyond the Standard Models" (2012, November 24)

A recent composite-dark-matter scenario assumes that the dominant fraction of dark matter consists of O-helium (OHe) dark atoms, in which a lepton-like doubly charged particle O is bound with a primordial ... [more ▼]

A recent composite-dark-matter scenario assumes that the dominant fraction of dark matter consists of O-helium (OHe) dark atoms, in which a lepton-like doubly charged particle O is bound with a primordial helium nucleus. It liberates the physics of dark matter from unknown features of new physics, but it demands a deep understanding of the details of known nuclear and atomic physics, which are still unclear. Here, we consider in detail the physics of the binding of OHe to various nuclei of interest for direct dark matter searches. We show that standard quantum mechanics leads to bound states in the keV region, but does not seem to provide a simple mechanism that stabilizes them. The crucial role of a barrier in the OHe-nucleus potential is confirmed for such a stabilization. [less ▲]

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See detailValidity of a new self-administered questionnaire assessing back posture habits
Demoulin, Christophe ULg; Martin, E.; GROSDENT, Stéphanie ULg et al

in Abstract Book of 6th Biennial Congress Belgian Back Society (2012, November 17)

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See detailIntérêt du Start Back Screening Tool pour les médecins généralistes
Demoulin, Christophe ULg; Mahieu, Geneviève; Hill, JC et al

in Abstract Book of 6th Biennial Congress Belgian Back Society (2012, November 17)

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See detailOptimization of the formation of vinyldithiins, a therapeutic compound from garlic
DETHIER, Bérénice ULg; Hanon, Emilien; Fauconnier, Marie-Laure ULg

in Pulkrabova, Jana; Tomaniova, Monika; Godulova, Vanda (Eds.) et al Chemical reactions in food: book of abstracts (2012, November 14)

Garlic has been used worldwide for centuries for its taste, but also for its health benefits. The therapeutic compounds are mostly organosulfurs, and can be formed when an enzyme, alliinase, gets in ... [more ▼]

Garlic has been used worldwide for centuries for its taste, but also for its health benefits. The therapeutic compounds are mostly organosulfurs, and can be formed when an enzyme, alliinase, gets in contact with its substrate, alliin. Both are separated in an entire cell, and react when the plant is damaged. The product of the enzymatic reaction, allicin, turns quickly into different molecules with potential beneficial effects. The way garlic is processed has a major influence on the released products. Indeed, an aqueous or oily medium, as far as the temperature, can emphasize the formation of specific compounds. Vinyldithiins are one of the active molecules, and are part of the garlic’s organoleptic properties. Their effects against obesity have been recently proven. This study aims to describe the conditions of vinyldithiins formation, as well as its extraction, purification and analyse. Vinyldithiins are mostly produced when garlic is crushed in edible oil, at low temperature. Extraction conditions (garlic/oil ratio, oil and garlic source, temperature and extraction time) were optimized. Analysis of the results were performed by HPLC.Finally, a purification process was set up. These results allow better knowledges on vinyldithiins formation that can be applied in garlic-based nutraceuticals. They might also lead to new uses of garlic in the production of highly valuable compounds. [less ▲]

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See detailUne approche basée objet combinée avec les classificateurs avancés (SVM, RF, RN) pour la détection des changements du bâti.
El Mansouri, Loubna ULg

in Proceding of Spatial Analysis and GEOmatics 2012 (2012, November 09)

L'objectif de cet article est de développer une méthodologie automatique pour la détection des changements du bâti en milieu urbain. L'approche est basée sur la comparaison entre un plan existant et une ... [more ▼]

L'objectif de cet article est de développer une méthodologie automatique pour la détection des changements du bâti en milieu urbain. L'approche est basée sur la comparaison entre un plan existant et une image à très haute résolution spatiale(THRS) récente. Elle s'enchaine sur 4 étapes. Premièrement l'image est segmentée pour produire des primitives. La sélection des attributs est faite ensuite quantitativement par l'algorithme MrMR, basé sur l'information mutuelle. Des classificateurs par apprentissage supervisé avancés ont été utilisés dans l'étape de la classification (SVM, Ensembles d'arbres de décision et Réseaux de Neurones). La prédiction finale des objets est déduite par un système de vote à partir des 3 meilleurs classificateurs. Enfin, une étape de détection de changements permet d'identifier les segments qui représentent les changements du bâti. Les données utilisées concernent la ville de Rabat (Maroc). Une image QuickBird a été utilisée avec un plan existant à l'échelle 1:10,000. Indépendamment de la qualité de la forme des bâtiments détectés, la méthode offre des meilleurs taux en complétude (95%) et en bonne détection (83%) [less ▲]

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See detailSpécificités des dégradations dans les bétons du patrimoine
Courard, Luc ULg; Lejeune, Astrid ULg

in Conservation et restauration des bétons du patrimoine moderniste (2012, November 09)

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See detailUse of Life Cycle Assessment to determine the environmental impact of thermochemical conversion routes of lignocellulosic biomass: state of the art
Gerbinet, Saïcha ULg; Léonard, Angélique ULg

in LCA conference 2012 - Proceeding of the 2nd international conference on life cycle approaches (2012, November 07)

The biomass is a promising way to substitute fossil fuels. Lignocellulosic biomass valorisation is part of second generation technologies. They are interesting in that they imply less competition with ... [more ▼]

The biomass is a promising way to substitute fossil fuels. Lignocellulosic biomass valorisation is part of second generation technologies. They are interesting in that they imply less competition with food crops for land and water, and they allow for the whole plant to be processed. Moreover, lignocellulose is abundant in cheap and non-food materials extracted from plants such as wood and energy crops. The thermo-chemical route is being considered more extensively, especially the gasification process. This process converts carbonaceous biomass into combustible gases (CO, H2, CO2, CH4, and impurities) called syngas in the presence of a suitable oxidant. The syngas can be converted into a large range of products, such as diesel, via a Fischer-Tropsch process, or methanol, used for producing DME (dimethyl ether), both of which can serve as fuels in traditional motors. Syngas can also be used to produce ethylene and propylene, two building blocks for the chemical industry. Production of these four compounds is specifically investigated. In order to insure that, under the principle of sustainability, the use of lignocellulosic biomass is a viable alternative, its environmental impact must be accurately quantified. The Life Cycle Assessment (LCA) methodology will be used in this regard for the gasification process. The gasification technology will be described, and a state of the art in LCA of the gasification process will be presented. Finally, the need for new research will be established. [less ▲]

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See detailOptimum design of low-cost housing in developing countries using nonsmooth simulation-based optimization
Nguyen, Anh Tuan ULg; Reiter, Sigrid ULg

in Proceedings of the 28th International PLEA Conference (2012, November 07)

An optimum design of Low-cost housing (LCH) offers low-income urban inhabitants great opportunities to obtain a shelter at affordable price and acceptable indoor thermal conditions. In the present study ... [more ▼]

An optimum design of Low-cost housing (LCH) offers low-income urban inhabitants great opportunities to obtain a shelter at affordable price and acceptable indoor thermal conditions. In the present study, the design and operation of a low cost dwelling were numerically optimized using simulation-based approach in which a dynamic building simulation program (EnergyPlus) was coupled with the optimization engine (GenOpt). Three multi-objective cost functions which include construction cost, indoor thermal comfort and 50-year operating cost were applied for naturally ventilated (NV) and air-conditioned (AC) buildings. Optimization problem which consists of 18 building parameters combined with 6 ventilation strategies was examined by two population-based optimization algorithms (Particle Swarm optimization and Hybrid algorithm) to find optimum combinations among these variables. The results show that the design requirements of NV and AC dwellings are not quite similar, and in a few categories, even contradictory. Optimum design corresponding to each cost function was outlined. Results of this paper also show great potential of optimization in comfort improvement, energy saving, life cycle cost, up to 40%. [less ▲]

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See detailLife Cycle Assessment of an artisanal Belgian blond beer
Melon, Raphaëlle ULg; Wergifosse, Vincianne; Renzoni, Roberto ULg et al

in [avniR] editions (Ed.) Proceedings of the 2nd International Conference on life cycle approaches (2012, November 06)

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See detailThe effects of hull modification on design parameters of medium speed monohuhll passenger ferries
Hetharia, Wolter; Rigo, Philippe ULg; Hage, André ULg

in ICSOT : Developments in ship design & construction (2012, November 01)

Developments in ship design & construction

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See detailA "new" design requirement: the mitigation of the progressive collapse of buildings under exceptional loading
Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Proceedings of the First International Conference of Civil Engineering (2012, November)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under an exceptional event. According to the Eurocodes and some different other national design codes, the structural integrity of civil engineering structures should be ensured through appropriate measures but, in most cases, no precise practical guidelines on how to achieve this goal are provided. At Liège University, the robustness of building frames is investigated with the final objective to propose design requirements to mitigate the risk of progressive collapse considering the conventional scenario “loss of a column” further to an unspecified event. In particular, a complete analytical procedure has been developed for the verification of the robustness of steel or composite plane frames. For sake of simplicity, these first works have been based on the assumption that the dynamic effects linked to the column loss were limited and could therefore be neglected. More recently, complementary works have been carried out with the objective to address the dynamic effects. Besides that, the extension of the static procedure to actual 3D frames is under investigation in Liège. The present paper gives a global overview of the ongoing researches in the field of robustness at Liège University; in particular, the global strategy to derive design requirements is detailed. [less ▲]

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See detailMéthodologie d’excitation de modes à diamètres nodaux d’un anneau statorique de turboréacteur
Nyssen, Florence ULg; Golinval, Jean-Claude ULg; Simon, Daniel et al

in Serra, Roger (Ed.) 3ième Colloque "Analyse Vibratoire Expérimentale" (2012, November)

Cette étude consiste à développer une approche expérimentale, permettant l’isolation de modes à diamètres nodaux spécifiques d’un étage statorique de compresseur basse pression, ayant pour objectif final ... [more ▼]

Cette étude consiste à développer une approche expérimentale, permettant l’isolation de modes à diamètres nodaux spécifiques d’un étage statorique de compresseur basse pression, ayant pour objectif final la calibration de jauges de déformation. Plus spécifiquement, une étude portant sur le nombre minimal de sources d’excitation (shakers) et sur leur répartition circonférentielle optimale a été menée, l’objectif suivi étant d’isoler des modes à diamètres cibles dans des conditions de laboratoire. La première partie de l’étude consiste en une approche théorique, basée sur les concepts d’appropriation modale en régime forcé. La combinaison optimale des positions des différents points d’excitation est choisie de façon à maximiser une fonction objectif, définie comme le rapport entre l’énergie injectée dans le mode cible et la valeur maximale des énergies injectées dans les modes présentant une fréquence naturelle proche du mode d’intérêt. Dans la deuxième partie de l’étude, des simulations numériques sur un modèle éléments finis de la structure ont été menées sur base des résultats théoriques obtenus. Enfin, la troisième partie a permis de valider expérimentalement les prédictions numériques via des analyses d’influence du nombre d’excitateurs et de leur position sur l’amplitude de la réponse fréquentielle. [less ▲]

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See detailQualification d’un appareil d'éclairage décoratif soumis aux vibrations induites par un pont ferroviaire
Marin, Frédéric; Simon, Daniel; Golinval, Jean-Claude ULg

in Serra, Roger (Ed.) 3ième Colloque "Analyse Vibratoire Expérimentale" (2012, November)

Au même titre que la plupart des pièces mécaniques soumises aux vibrations, les appareils d'éclairage installés en extérieur sont amenés à satisfaire, en fonction de leurs conditions d’utilisation, aux ... [more ▼]

Au même titre que la plupart des pièces mécaniques soumises aux vibrations, les appareils d'éclairage installés en extérieur sont amenés à satisfaire, en fonction de leurs conditions d’utilisation, aux exigences de procédures d'essais appliquées sur table vibrante. Celles-ci ont pour but de garantir l'intégrité structurelle du luminaire lorsque, une fois sur site, il est soumis aux effets du vent. Dans le cas des appareils d'éclairage décoratifs installés sur un pont de chemin de fer de structure métallique, le vent n'étant plus la source principale de vibrations en comparaison du trafic ferroviaire, on est dès lors confronté à une absence de toute indication appropriée décrivant l'essai à mener. Par conséquent, l'objectif de cette étude est d'élaborer une spécification d'essai de durée réduite, appliquée en laboratoire sur table vibrante, et représentative de l'environnement vibratoire réel de l'appareil à certifier. Sur base des essais réalisés en laboratoire, des prescriptions de montage et d'installation sont également formulées afin de garantir des conditions d’utilisation et d’essai identiques. [less ▲]

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See detailPlant growth- promoting rhizobacteria emit volatiles compounds with biostimulation activity in dicot and monocot plant species.
du Jardin, Patrick ULg; Delaplace, Pierre ULg; Varin, Sébastien et al

in Perata, Pierdomenico; Brown, Patrick; Ponchet, Michel (Eds.) Abstracts Book for Oral and Poster Presentations of the 1st World Congress on the use of Biostimulants in Agriculture (2012, November)

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See detailWhat is the best use of sugar crops? Environmental assessment of two applications : biofuels vs. bioproducts
Belboom, Sandra ULg; Léonard, Angélique ULg

in [avniR] editions (Ed.) LCA Conference 2012 - Proceedings of the 2nd international conference on life cycle approaches (2012, November)

Agricultural crops became through years a possibility to increase European energy independence. Brazil has taken this opportunity since the seventies by using sugar cane bioethanol as vehicle fuel. The ... [more ▼]

Agricultural crops became through years a possibility to increase European energy independence. Brazil has taken this opportunity since the seventies by using sugar cane bioethanol as vehicle fuel. The development of biofuels production is more recent in Europe. Due to temperate climates, bioethanol production is mostly based on wheat and sugar beet, this latter being considered as the ‘equivalent’ sugar crop to sugar cane for Europe. Biofuel is the most common application of bioethanol but its transformation into bioethylene through a dehydration step can be an alternative as already found in Brazil. This paper will consider both potential uses and compare them using Life Cycle Assessment methodology. Common boundaries of the systems comprise the cultivation step for both crops, i.e. sugar cane and sugar beet, with all associated energetic and fertilizer consumptions, the transportation step from field to the industrial plant, the sugar crops transformation into hydrate bioethanol and the by-products valorisation. For the biofuel scenario, a dehydration step using molecular sieve is added to get anhydrous bioethanol. For the bioethylene scenario, an industrial dehydration step is added. Direct comparison between both scenarios is not possible due to different products uses. The comparison was then performed for both scenarios between the bio-based product and its fossil equivalent. ReCiPe 2008 method was used to get the environmental impacts. As expected, the impact of bio-based products in climate change and fossil fuel depletion categories decreases compared to the fossil counterparts. For other categories, difference is less significant and results are often better for fossil products. Land use change category was implemented to assess its importance. Depending on assumptions, the greenhouse gas emissions from crop implementation on a natural land can counteract the previous mentioned benefits. This study shows the importance of assumptions, especially in the agricultural field, on the obtained results. [less ▲]

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See detailMODELING OF A GLASS WOOL PROCESS IN VIEW OF LIFE CYCLE ASSESSMENT (L.C.A.)
Gerbinet, Saïcha ULg; Renzoni, Roberto ULg; Briard, Vincent et al

in LCA conference 2012 - Proceeding of the 2nd international conference on life cycle approaches (2012, November)

Taking into account the environmental aspects in the building sector has become unavoidable. In France, environmental and sanitary statements for building products (“Fiches de Déclarations ... [more ▼]

Taking into account the environmental aspects in the building sector has become unavoidable. In France, environmental and sanitary statements for building products (“Fiches de Déclarations Environnementales et Sanitaires” (FDE&S)) have been developed. The environmental part of the statement is based on Life Cycle Assessment. So, KnaufInsulation, glass wool producer for the French market, has started to evaluated the environmental impacts of it process in view of FDE&S realization. The process has been modeling in GaBi with industrial data. Adjustable parameters have been introduced to allow to study the environmental impacts of almost all the KnaufInsulation products. So the FDE&S can be easily done for the different products. This model is also used for eco-conception. The LCA results allow to show the life cycle leaks. More, in modifying the model, the impact of a change in the process on its environmental performances will be highlighted. So relevant improvement will be brought out. The model and the mains results as the eco-conception strategy will be presented. The interest of making a modeling based on the step and process of the life cycle of a product or a product range will be clearly understood. [less ▲]

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See detailLimitations of the current practice in neonatal PN across Europe
SENTERRE, Thibault ULg

in 3rd International Congress of Union of European Neonatal and Perinatal Societies (2012, November)

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See detailTime-domain finite-element modelling of laminated iron cores – Large skin effect homogenization considering the Jiles-Atherton hysteresis model
Vazquez Sabariego, Ruth ULg; Niyonzima, Innocent ULg; Geuzaine, Christophe ULg et al

in Proceedings of the 15th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2012) (2012, November)

This paper deals with the incorporation of the Jiles- Atherton (J-A) hysteresis model in a time-domain finite-element homogenization technique for laminated iron cores. The separate discretization of each ... [more ▼]

This paper deals with the incorporation of the Jiles- Atherton (J-A) hysteresis model in a time-domain finite-element homogenization technique for laminated iron cores. The separate discretization of each lamination is avoided by using dedicated skin-effect basis functions, which also serve to interpolate the J- A hysteretic material law. As validation test case, a stacked ring core surrounded by a toroidal coil is considered. [less ▲]

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See detailHomogenisation of Windings and Laminations in Time-Domain Finite-Element Modeling of Electrical Machines
Gyselinck, Johan; Geuzaine, Christophe ULg; Vazquez Sabariego, Ruth ULg

in Proceedings of the 15th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2012) (2012, November)

This paper deals with time-domain homogenisation of multi-turn windings and laminated cores in 2D and 3D finite- element (FE) modelling of rotating electrical machines. Herein the number of additional ... [more ▼]

This paper deals with time-domain homogenisation of multi-turn windings and laminated cores in 2D and 3D finite- element (FE) modelling of rotating electrical machines. Herein the number of additional degrees of freedom (auxiliary field variables) in the homogenised regions can be fixed depending on the extent of the eddy current effects and on the desired accuracy. The homogenisation technique is illustrated and validated by means of a 2D model of a switched reluctance motor. Global quantities, such as the phase impedance, converge very well to those produced by a precise but very expensive 3D model. [less ▲]

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See detailComputational Homogenization for Laminated Ferromagnetic Cores in Magnetodynamics
Niyonzima, Innocent ULg; Vazquez Sabariego, Ruth ULg; Henrotte, François et al

in Proceedings of the 15th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2012) (2012, November)

In this paper, we investigate the modeling of fer- romagnetic multiscale materials. We propose a computational homogenization method based on the heterogeneous multiscale method (HMM) that includes eddy ... [more ▼]

In this paper, we investigate the modeling of fer- romagnetic multiscale materials. We propose a computational homogenization method based on the heterogeneous multiscale method (HMM) that includes eddy currents and hysteretic losses at the mesoscale. The HMM comprises: 1) a macroscale problem that captures the slow variations of the overall solution; 2) many microscale problems that allow to determine the constitutive law at the macroscale. As application example, a laminated iron core is considered. [less ▲]

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See detailPerformances isocinétiques et risque lésionnel de l’épaule chez le joueur de handball de haut niveau
Forthomme, Bénédicte ULg; Schiettecatte, Delphine; GAULT, Clément ULg et al

in Abstract book des XIVèmes Rencontres isocinétiques MEDIMEX / ROTHSCHILD (2012, November)

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See detailLa perception de la présence des investisseurs institutionnels publics dans la structure de capital des « Maisons de luxe » belges : le point de vue des entrepreneurs dirigeants
Riguelle, France ULg; Van Caillie, Didier ULg

in Finet, Alain, Monaco, Carole (Ed.) Les Investisseurs Institutionnels : diabolisation ou sacralisation ? (2012, November)

This contribution aims at proposing a synthetic review of the perceived interest for Belgian Luxury Houses of the presence of public institutional investors in their capital structure from the ... [more ▼]

This contribution aims at proposing a synthetic review of the perceived interest for Belgian Luxury Houses of the presence of public institutional investors in their capital structure from the entrepreneur's point of view. Our results highlight the duality of interests perceived by CEO's of Belgian luxury Houses. [less ▲]

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See detailPoint actuel sur la signification des ratios agonistes / antagonistes au membre inférieur
Croisier, Jean-Louis ULg; Delvaux, François ULg; Kaux, Jean-François ULg et al

in Abstract book des XIVèmes Rencontres isocinétiques MEDIMEX / ROTHSCHILD (2012, November)

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See detailAn online interactive tool for the energy assessment of residential buildings and transportation
Marique, Anne-Françoise ULg; de Meester, Tatiana; Reiter, Sigrid ULg

in Proceedings of PLEA 2012 (2012, November)

In the current context of increasing environmental awareness, energy efficiency is presented as a viable approach to the mitigation of climate change. In addition to public policies dealing with energy ... [more ▼]

In the current context of increasing environmental awareness, energy efficiency is presented as a viable approach to the mitigation of climate change. In addition to public policies dealing with energy efficiency, heightening public awareness on the impact of citizens’ lifestyles and behaviours is crucial and could quickly lead to significant reductions in the total energy consumption of a territory. This paper presents a new online interactive tool which enables citizens, local authorities and private developers (1) to assess energy consumption in the building and transportation sectors, at the individual and at the neighbourhood scales; (2) to compare them and (3) to find relevant and personalized hints to reduce their energy consumptions. Numerous methods and tools including a typological classification of buildings, thermal dynamic simulations, life-cycle assessments, statistical treatments of national censuses, etc. were used and combined to build the database used in the online interactive tool. This tool makes the main results of a scientific research accessible to a large non-specialized audience which is crucial in the scope of the sustainable development. Keywords: interactive tool, assessment methods, buildings, transportation, households, scientific popularization [less ▲]

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See detailDetecting Consciousness with a Brain-computer Interface
Noirhomme, Quentin ULg; Lesenfants, Damien ULg; Lehembre, Remy ULg et al

in Pons, J. L.; Torricelli, D.; Pajaro, M. (Eds.) Converging Clinical and Engineering Research on Neurorehabilitation (2012, November)

Recent electrophysiological and neuroimaging studies showed command-specific changes in EEG or fMRI signals of unresponsive patients providing motor-independent evidence of conscious thoughts. These ... [more ▼]

Recent electrophysiological and neuroimaging studies showed command-specific changes in EEG or fMRI signals of unresponsive patients providing motor-independent evidence of conscious thoughts. These promising results have paved the way for a new application for Brain-computer Interface (BCI): detecting consciousness in patients with disorders of consciousness (DOC). In the present abstract, we review the first results obtained by BCI-like applications in patients with DOC and discuss the challenges facing BCI research. We believe that patients with DOC may benefit from BCI based diagnosis. BCIs may detect changes in the signal in response to command and, in some cases, may permit communication. [less ▲]

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See detailAccurate h-Conform Finite Element Model of Multiply Connected Thin Regions via a Subproblem Method
Dang, Quoc Vuong ULg; Dular, Patrick ULg; Vazquez Sabariego, Ruth ULg et al

in Proceedings of the 15th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC2012) (2012, November)

A subproblem method for solving eddy current finite element is developed to correct the inaccuracies near edges and corners arising from thin shell models. Such models replace thin volume regions by ... [more ▼]

A subproblem method for solving eddy current finite element is developed to correct the inaccuracies near edges and corners arising from thin shell models. Such models replace thin volume regions by surfaces but neglect border effects in the vicinity of their edges and corners. A thin shell solution, performed by a simplified mesh near the thin structures, serves as a source of a correction problem consisting of the actual volume thin regions alone and concentrating the meshing effort on the thin regions. The general case of multiply connected thin regions is considered. [less ▲]

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See detailDétection d'endommagement et résonances locales sur composite CFRP par vibrothermographie
Demy, Philippe ULg; Golinval, Jean-Claude ULg; Simon, Daniel

in Serra, Roger (Ed.) 3ième Colloque "Analyse Vibratoire Expérimentale" (2012, November)

La vibrothermographie est une technique de thermographie active capable de détecter des singularités de type délaminage ou décollement dans un matériau composite comme les laminés en fibres de carbone ... [more ▼]

La vibrothermographie est une technique de thermographie active capable de détecter des singularités de type délaminage ou décollement dans un matériau composite comme les laminés en fibres de carbone très utilisés actuellement en construction aéronautique (CFRP). Les causes physiques du mécanisme d'échauffement interne, suite à l'interaction avec les ondes élastiques, peuvent être la friction, l'hystérésis viscoélastique ou encore la déformation plastique. La méthode est efficace également sur des géométries complexes et requiert uniquement que les deux faces internes du délaminage soient libres de vibrer. Cette étude consiste à déterminer la relation entre l'échauffement observé et la fréquence d'une excitation sinusoïdale entre 8 et 27 kHz. Il apparaît clairement des pics d'échauffement pour certaines fréquences particulières. La comparaison avec les fréquences de résonance locale du défaut modélisé par éléments finis montre des similitudes avec l'apparition de certains de ces pics. Une étude expérimentale visant à exploiter la présence de ceux-ci montre l'intérêt d'un test vibrothermographique de type balayage rapide (chirp), dans l'optique de mettre sur pied un test court et fiable pour le contrôle non destructif de matériaux composites. [less ▲]

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See detailAn overview of the microbenthic loop in Posidonia oceanica meadows: the good, the bad and the ugly
Pete, Dorothée ULg; Quattrocchi, Loïc; Velimirov, Branko et al

in Creed, J.C.; Oigman-Pszczol, S.S. (Eds.) Proceedings of the 10th International Seagrass Biology Workshop (ISBW10), 25- 30 November 2012, Armação dos Búzios, Brazil (2012, November)

Posidonia oceanica is an endemic seagrass of the Mediterranean Sea. The ecosystem based on this plant is essential from an ecological and economical point of view (commercial species, touristic activities ... [more ▼]

Posidonia oceanica is an endemic seagrass of the Mediterranean Sea. The ecosystem based on this plant is essential from an ecological and economical point of view (commercial species, touristic activities, oxygen production), though very sensitive to environmental perturbations. To detect those perturbations, scientists are trying to find more efficient ecological indicators. Most of the time, those indicators are based on the plant itself. Unfortunately, this seagrass does not react very quickly to perturbations so, when a reaction is noticed, it is often too late to prevent irremediable damages to the ecosystem. The sedimentary compartment of P. oceanica meadows has been less studied than the canopy level. However, it could be a good source of ecological indicators because it is the final container of all the pollution. In this framework, the microbenthic loop has been studied. It is a major subsystem of those meadows and encompasses organic matter, bacteria, microphytobenthos and meiofauna. As those organisms have a rapid turnover and stay almost all their life inside the sediment, they seemed good potential indicators. This presentation will show what is useful or not inside the sediment and more specifically inside the microbenthic loop. Results of a comparison between a fish farm and a reference location will be used, as well as in situ experiments (shading and sediment loading) and small spatial scale variations. At the end of this presentation, you will know what are the good, the bad and the ugly in the sedimentary compartment of a P. oceanica meadow. [less ▲]

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See detailInterference of a secondary task on procedural learning in children
Lejeune, Caroline ULg; Desmottes, Lise ULg; Catale, Corinne ULg et al

in Belgian Brain Congress 2012: Abstract Book (2012, October 27)

Introduction Procedural learning is generally considered as involving different learning phases, with cognitive resources playing an important role only during the initial learning step. Through repeated ... [more ▼]

Introduction Procedural learning is generally considered as involving different learning phases, with cognitive resources playing an important role only during the initial learning step. Through repeated practice, the skill becomes progressively more automatic and the involvement of controlled cognitive functions is progressively reduced (Anderson, 2000;Doyon and Benali, 2005;Beaunieux et al., 2006). This view has been supported by studies in which the mirror-tracing paradigm was used to evaluate procedural learning, demonstrating the implication of the executive mechanisms in the first phase of perceptuomotor learning (Rouleau, 2002;Brosseau et al., 2007). However, from a developmental perspective, little is known about the progression of learning in procedural tasks, as well as about the role played by the explicit cognitive processes during learning in children. We recently showed that the cognitive mechanisms involved during the procedural task differed between age groups (Lejeune et al., in press). Indeed, we observed that 7-year-old children performed the procedural task in a less controlled fashion than 10-year-olds, who used a more conscious strategy, which permits them to reach better performance levels. The aim of the present study was to confirm the differential implication of explicit mechanisms in procedural learning in children by using a dual-task paradigm. Objective The present study used a dual-task paradigm in order to further investigate the role played by explicit mechanisms during the early and final stages of procedural learning in two ages-groups (7- and 10 year-olds). An auditory interference task was introduced at the beginning and at the end of the procedural learning phase. According to Sun, Merrill, and Peterson (2001), the introduction of an interference task should affect more the explicit processes than the implicit processes, the latter being more automatic. Thus, we predict that performance would be altered by in the dual-task condition only during the first phase of learning, and not during the automation phase. Furthermore, considering that the cognitive mechanisms underlying procedural learning would be different between 7- and 10-year-old children, we predicted that the impact of the dual-task would differ between the two aged-groups: the dual-task condition should affect performance in 10-year-old children but not in the 7-year-old group. Method Seventy-six children were presented with a Mirror Tracing task under single or dual-task conditions. For the Mirror Tracing task, we conformed to the procedure used in previous studies in children (Vicari et al., 2005;Prehn-Kristensen et al., 2009) and we opted for a 5 points star with the double outline of 1 cm. The instruction was to follow the contour of the figure in order to “catch” different picture without leaving the limits of the contour. There were two learning sessions; the task included 10 trials, with a short break (2 min) between trials, and a second 10 trial session was conducted after a one-week delay. In dual-task condition, participants had to perform the procedural learning task while performing at the same time the interference auditory task (which consisted to answer to questions presented continuously). Results Results showed that completion time and accuracy during the mirror tracing task improved with each successive trial in both groups: all children learned the procedural skill regardless of their age and the experimental condition. As predicted, results showed that the impact of the dual-task differed between aged-groups during the first learning phase. While 10-year-old children were significantly slower and less accurate in the dual-task condition than 10-year-old children in the single-task condition, no difference between learning conditions was revealed in the 7-year-old group. Interestingly, at the end of learning (trials 19 and 20), the interference effect had disappeared: there was no impact of the secondary task on procedural performance, whatever the age-group. Discussion In this study, we explored with a dual-task paradigm the role played by explicit mechanisms during the early and final stages of procedural learning in two age-groups (7- and 10 year-olds). During the first learning step, 10-year-old children in the single-task condition used a conscious strategy to perform the task, which permits them to reach better performance levels than 10-year-old children in the dual-task condition (which prevents them from using their controlled cognitive processes). On the contrary, no impact of the interference task was observed in 7-year-old children, who performed the mirror tracing task similarly in the single- and dual-task conditions. This result supports our hypothesis that, in the beginning of a perceptuo-motor learning task, youngest children perform the procedural task in a more implicit fashion comparatively to older children. Thus, while performance of 10-year-old children is congruent with a top-down conception of procedural learning (i.e., performance in the first learning stages would be sustained by high-level explicit mechanisms), this is not the case for youngest children whose explicit mechanisms are not yet mature. So, our results confirm that the involvement of explicit learning mechanisms is not a “necessary condition” for motor skill learning to occur, a point of view supported by the bottom-up skill learning approach which postulates that explicit declarative knowledge is not necessarily associated with procedural skill learning and that the knowledge acquired could be stored in an implicit mode from the beginning of learning (Karmiloff-Smith, 1992;Sun et al., 2001). [less ▲]

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See detailIs there a relationship between perseverations and spatial short-term memory deficits in unilateral neglect?
Wansard, Murielle ULg; Bartolomeo, Paolo; Gillet, Sophie ULg et al

in Abstract Book Belgian Brain Congress (2012, October 27)

Introduction Spatial neglect is a multicomponent syndrome characterized by an inability to orient or to respond to stimuli arising in the hemispace contralateral to a brain lesion. According to many ... [more ▼]

Introduction Spatial neglect is a multicomponent syndrome characterized by an inability to orient or to respond to stimuli arising in the hemispace contralateral to a brain lesion. According to many authors, spatial neglect can be explained by an attentional deficit, and more specifically by a lateral attentional bias towards the right (magnetic attraction) and/or difficulties in disengaging attention from items to the right side. However, attentional theories are not sufficient to explain some behaviors such as revisiting and perseverations. Recently, it has been suggested that revisiting and perseveration behaviors in visual search tasks shown in parietal neglect could be related to impairments in visuo-spatial working memory (Husain et al., 2001; Malhotra et al., 2005; Malhotra, Mannan, Driver, & Husain, 2004). This hypothesis is supported by studies (1) in which a contrast is made between cancellation tasks with and without visual control, the absence of visual feedback increasing left neglect (omissions) and repeated cancellations (perseverations) towards the ipsilesional space, and (2) in which the Corsi test is administrated in a vertical way. However, Ronchi et al. (2009) did not confirm the link between impairments in spatial short-term memory and perseverations. Indeed, these authors found no correlation between perseverations in star cancellation and spatial memory performance in the Corsi test. Nevertheless, they did not use a condition without visual feedback, which is considered as involving more spatial short-term memory than a condition with visual feedback. This methodological choice could explain the lack of relationship between short-term memory and perseverations in the Ronchi et al.’s study. The purpose of our study was to test the hypothesis of a spatial short-term memory deficit being an explanatory factor of perseverations in unilateral neglect. Methods We assessed twenty right-damaged patients suffering from left neglect. Neglect signs were evaluated with the Batterie d’Evaluation de la Négligence (BEN) (Azouvi et al., 2002). Twenty healthy older participants matched for age and sociocultural level served as controls. In order to explore the relationship between perseverations and spatial short-term memory, two different tasks were administrated: a computerized version of the Corsi test and a cancellation task. All tests were computerized and presented on a touchscreen. The subject’s spatial span corresponded to the longest sequence in which at least three out of four sequences were correctly reproduced. The cancellation task consisted of 32 “O” presented in two conditions: with (visible) and without (invisible) visual feedback. Patients were instructed to cancel out all targets only once. The number of omissions and perseverations was calculated for each participant in both conditions. Results Control participants performed better than neglect patients in the Corsi test; eleven neglect patients showed a deficit in spatial short-term memory. In the cancellation tasks, Wilcoxon matched-pairs signed ranks tests highlighted that perseverations and omissions were greater in the invisible condition for each group. In this condition, neglect patients made more omissions and perseverations (all ps <.05) than control subjects, while in the visible condition there was only a significant difference for the omissions. However, spatial short-term memory did not explain perseverations in invisible condition (R² = .17, F(1,18) = 3.66, p = .07). Discussion These findings suggest that a spatial short-term memory deficit cannot be considered as an explanatory factor for the perseveration behavior in unilateral neglect. Moreover, perseverations and omissions were greater in the invisible condition than in the visible one; therefore, the hypothesis of the magnetic attraction is not confirmed either. In the neglect patients’ group, the visual feedback decreases, and even eliminates the neglect symptoms (omissions and perseverations) compared to the invisible condition. In other words, the presence of visual feedback can help patients to explore their visual environment. We propose that, in the invisible condition, difficulties to plan a visual search could exacerbate both omissions and perseverations, leading to recursive search towards the right side of the space and thus promote failure to explore left space. However, further investigations will be necessary to confirm this hypothesis. [less ▲]

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See detailA Simplified Assessment of Ship Impact on Navigation Lock Gates
Buldgen, Loïc ULg; Le Sourne, Hervé; Rigo, Philippe ULg

in Proceedings of the fourth International Conference on Estuaries and Coasts (2012, October 26)

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See detailUndefinable or undefined? Remarks on Hjelmslev's definition strategy
Cigana, Lorenzo ULg

in Galassi, Romeo; Badir, Sémir; Cigana, Lorenzo (Eds.) et al I. Glossematica: principi e applicazioni / II. Actes du colloque "Reading the Résumé of a Theory of Language/Lire le Résumé d'une Théorie du Langage" (2012, October 26)

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See detailPneumonia and ciliar disease - News about genetic background (i.e. Irish wolfhound), pathology, diagnostics and therapy
Clercx, Cécile ULg

in Proceedings of 58th Annual Conference of GSAVA in Duesseldorf, Germany (2012, October 20)

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See detailLung Fibrosis in dogs - News about genetic background, pathology, diagnostics and therapy
Clercx, Cécile ULg

in Proceedings of 58th Annual Conference of GSAVA in Duesseldorf, Germany (2012, October 20)

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See detailEffect of Azawak colostrum administration on plasma protein profile in red kid
Abdoul, H; Marichatou, H; Beckers, Jean-François ULg et al

in Proceedings of the 2nd Scientific Meeting of the Faculty of Veterinary Medicine (2012, October 19)

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See detailPlacental and gastric aspartic proteinases: new insights from bovine species
Bella, Amina ULg; Beckers, Jean-François ULg; Melo de Sousa, Noelita ULg

in Proceedings of the 2nd Scientific Meeting of the Faculty of Veterinary Medicine (2012, October 19)

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See detailThe three-dimensional reconstruction of the innervation pattern in the lymphoid compartment of the ovine pharyngeal tonsil highlighted a possible way of neuro-invasion by the scrapie agent.
Toppets, Vinciane ULg; Piret, Joëlle ULg; Grobet, Luc ULg et al

in Proceedings of the 2nd Scientific Meeting of the Faculty of Veterinary Medicine, ULg, Belgium, October 19, 2012 (2012, October 19)

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See detailClinical aspects of alfaxalone use in rabbits. Partial results.
Tutunaru, Alexandru-Cosmin ULg; Sonea, P; Drion, Pierre ULg et al

in BCLAS, ESLAV (Ed.) Proceedings BCLAS, ESLAV & ECLAM Scientific Meeting (2012, October 15)

Alfaxalone, a synthetic neuroactive steroid, has been shown to induce smooth general anesthesia in wild and companion rabbits. The aim of the study was to test the effect of alfaxolone in experimental ... [more ▼]

Alfaxalone, a synthetic neuroactive steroid, has been shown to induce smooth general anesthesia in wild and companion rabbits. The aim of the study was to test the effect of alfaxolone in experimental rabbits without concomitant oxygen supplementation.Respiratory status was assessed by measuring the duration of the post-induction apnea, the respiratory rate, the oxygen saturation of hemoglobin in the peripheral blood (SpO2) and the end-tidal CO2 (EtCO2) Cardiac function was assessed by monitoring heart rate using a pulse oximeter. The degree of anesthesia was monitored by evaluating ear and paw pinch reflex, as well as ocular signs such as nystagmus, exophtalmia and the loss of palpebral and corneal reflexes. [less ▲]

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See detailLe mineur en droit médical
Nottet, Aurélie ULg

in Genicot, Gilles (Ed.) Nouveaux dialogues en droit médical (2012, October 12)

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See detailAnalyse de l'eau du Poncia (Gembloux)
Warzée, Sébastien; Iseux, Julien; Guyon, Jérémie et al

in L'analyse chimique, outil des experts (2012, October 11)

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See detailGabriel package: software for education and research
Olive, Gilles ULg

in L'analyse chimique, outil des experts (2012, October 11)

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See detailEncres anciennes: l'encre ferro-gallique
Wymeersch, Noémie; Bouchat, Isabelle; Henry, Lauric et al

in L'analyse chimique, outil des experts (2012, October 11)

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See detailInland intermodal freight transport modelling
Carreira, Joana; Santos, Bruno; Limbourg, Sabine ULg

in ETC Proceedings (2012, October 10)

The demand for goods has grown in the past decades, in such a way that today freight transport has become essential for the support of modern economies. The search for a competitive freight transport ... [more ▼]

The demand for goods has grown in the past decades, in such a way that today freight transport has become essential for the support of modern economies. The search for a competitive freight transport system, able to cope with the growing freight flows, has lead in the last decades to large investments in intermodal transport options, mainly in Europe and North America. Intermodal freight transport is the movement of goods done with the same loading unit (or vehicle) by successive modes of transport, without handling the goods themselves when changing the modes. This paper focus on inland intermodal freight transport, in particular, on the rail?truck transport of cargo containers in Belgium. The work aims to discuss the strategic decision of locating the rail-truck intermodal terminals in Belgium, in which freight can change between modes, while tacking into account the containerized cargo flows between the seaports of Belgium (Antwerp, Zeebruge, Ghent, and Ostend), the main generation centres in Belgium, and the generation centres at the border regions of neighbouring countries. The competitiveness of rail-truck networks in comparison of truck-only is discussed, in particular, for a relative small country as Belgium. [less ▲]

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See detailPrincipal Static Wind Loads on a large roof structure
Blaise, Nicolas ULg; Hamra, Lotfi ULg; Denoël, Vincent ULg

in Proceedings of the 12th ANIV conference of wind engineering In Vento (2012, October 07)

Usually, structural wind design is realized using static wind loads. Such loadings are expected, as a main property, to recover by static analyses, the envelope values that would be obtained by a formal ... [more ▼]

Usually, structural wind design is realized using static wind loads. Such loadings are expected, as a main property, to recover by static analyses, the envelope values that would be obtained by a formal buffeting analysis. For simple structures, equivalent static wind loads might be used but they are established in order to reproduce envelope values of specific structural responses and are thus not suitable to reconstruct efficiently the entire envelope. Recently, more general methods were derived to propose global static loadings that reconstruct the entire envelope but several drawbacks remained as their robust applicability for any structure and accuracy. This paper addresses a new type of static loadings, the principal static wind loads, derived in a strict mathematical way, the singular value decomposition, to make it optimum for the envelope reconstruction problem. The method is illustrated with a large roof and the reconstruction accuracy is analysed by studying the rate of envelope reconstruction, envelope previously obtained by a rigourous stochastic analysis. The way principal loadings are derived makes them suitable for combinations in order to increase the rate of the envelope reconstruction. As a major outcome, the method provides a finite number of design load cases that matches a desired level of accuracy in the envelope reconstruction. [less ▲]

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See detailL’argumentation par le pathos dans la métaphore. Analyse énonciative d’un phénomène dialogique.
Goin, Emilie ULg

in Colloque international « Langage et analogie. Figement. Argumentation. »: Sfax/Tozeur 4-5 octobre 2012 (2012, October 05)

En nous plaçant dans la perspective de la linguistique pragma-énonciative et de l’analyse du discours, nous envisagerons le rôle argumentatif de la dimension pathémique de la métaphore (souvent liée à la ... [more ▼]

En nous plaçant dans la perspective de la linguistique pragma-énonciative et de l’analyse du discours, nous envisagerons le rôle argumentatif de la dimension pathémique de la métaphore (souvent liée à la dimension idéologique). Nous verrons comment cette argumentation est déterminée par deux phénomènes, qui relèvent, chacun à leur manière, de l’hétérogénéité énonciative : d’une part la mobilisation d’une série de lieux communs inducteurs d’émotion et d’autre part l’identification de la source énonciative de la métaphore, celle-ci pouvant être plus ou moins assumée ou déléguée, avec des cas d’indétermination où les points de vue se superposent. [less ▲]

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See detailPerformance of Solmacs, a High PV Solar Concentrator With Efficient Optics
Thibert, Tanguy ULg; Hellin, Marie-Laure ULg; Loicq, Jerôme ULg et al

in AIP Conference Proceedings, , Volume 1477 (2012, October 05)

A new solar panel with high concentration photovoltaic technology (x700) has been designed, prototyped and tested in the SOLMACS project. The quality of concentrating optics is a key factor for high ... [more ▼]

A new solar panel with high concentration photovoltaic technology (x700) has been designed, prototyped and tested in the SOLMACS project. The quality of concentrating optics is a key factor for high module efficiency. Therefore new dedicated PMMA Fresnel lenses were studied and produced by injection molding. Lens design, material and production process were optimized to achieve a high optical yield of 86%. Thorough lens performance assessment in optical laboratory was completed with lifetime UV aging tests. Another important aspect is the thermal control of the hot spot created under the solar cell that receives the concentrated flux of 700 Suns. A dedicated heat spreader was developed to achieve passive thermal control with minimum mass and cost. This was supported by thermal models and tests at both cell and module level. 35% triple junction cells were implemented in the module. Micro-assembly technologies were used for the cell packaging and electrical connections. In support to the research, a continuous solar simulator was designed and built to assess the system performance, both at component and module level. The concentrator developments were integrated in a prototype and tested both indoor with the simulator and outdoor on the CSL solar test platform. The overall efficiency of the PV concentrator module is 28.5%. [less ▲]

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See detailPrototyping of a Phase Change Material Heat Storage Device
Collette, Jean-Paul; Rochus, Pierre ULg; Peyrou-Lauga, Romain et al

in Proceedings of the 63rd International Astronautical Congress 1-5 Octobre 2012 (2012, October 05)

A new concept of Phase Change Materials (PCM) device has recently been developed to improve the thermal control of spacecraft. Two Phase Change Material candidates have been selected after extensive ... [more ▼]

A new concept of Phase Change Materials (PCM) device has recently been developed to improve the thermal control of spacecraft. Two Phase Change Material candidates have been selected after extensive testing of a set of available materials. Special attention has been paid to the hysteresis and ageing. In the design of the container, the thermal expansion of the PCM is a critical parameter that has been taken into consideration by two competing technologies. These designs have been tested: a prototype of PCM heat storage device has been effectively manufactured and tested under vacuum environment. 1D and 2D mathematical models have been developed. Conclusions are drawn to promote the use of PCM Heat Storage device in various space missions. [less ▲]

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See detailNew construction or renovation in Belgium: Setting the net and nearly zero energy building target in perspective
Attia, Shady ULg

in PassiveHouse 2012 Conference Proceedings (2012, October 05)

The recast of the European Performance of Buildings Directive (EPBD) requires all new buildings to be “nearly zero energy’ buildings (nZEB) by 2020, including existing buildings undergoing major ... [more ▼]

The recast of the European Performance of Buildings Directive (EPBD) requires all new buildings to be “nearly zero energy’ buildings (nZEB) by 2020, including existing buildings undergoing major renovations. The revised Energy Performance in Buildings Directive calls governments to meet the nearly zero energy targets by 2020. Governments must adopt and publish regulations and procedures for the other requirements mainly the cost optimal calculation by July 2012. Many elements of the EPBD recast pertain to new buildings. Unfortunately, the recast does not set targets for improving existing buildings and non-legislative measures are required to address how to achieve a greater share of renovation. Therefore, this paper aims to identify the share of the newly constructed buildings by 2020 in Belgium. The objective is to put the nearly zero energy targets in a wider perspective in relation to the existing building stock. The paper investigates some future scenarios for the national buildings stock growth rate, coupled with demographic growth by 2050. The study’s results indicate that newly constructed building will be less than 7% by 2020 and less than 15% by 2050 in Belgium. Thus by not addressing the potential for energy renovations in the building sector the EPBD is avoiding the larger problem. [less ▲]

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See detailUsing Proper Orthogonal Decomposition Methods for Comparing CFD Results to Experimental Measurements
Andrianne, Thomas ULg; Guissart, Amandine ULg; Terrapon, Vincent ULg et al

in Proceedings of the 5th Symposium on Integrating CFD and Experiments in Aerodynamics (Integration 2012) (2012, October 03)

This work presents a method for quantitative comparison of numerical results to experimental measurements. It is based on the concept of Proper Orthogonal Decomposition. This technique is selected in ... [more ▼]

This work presents a method for quantitative comparison of numerical results to experimental measurements. It is based on the concept of Proper Orthogonal Decomposition. This technique is selected in order to compare the unsteady aerodynamic flows around static and oscillating bodies obtained from wind tunnel testing and numerical simulations. Two dimensional Time-resolved Particle Image Velocimetry measurements are carried out on the upper surface a 4:1 rectangular cylinder. Simulations are performed using unsteady Reynolds-Averaged Navier-Stokes and an unsteady Discrete Vortex Method. It is demonstrated that the proposed technique is a good preliminary step for comparing the main characteristics of unsteady aerodynamic data. [less ▲]

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See detailStellar Occultations by Large TNOs on 2012: The February 3rd by (208996) 2003 AZ84, and the February 17th by (50000) Quaoar
Braga Ribas, Felipe; Sicardy, B.; Ortiz, J. L. et al

in AAS/Division for Planetary Sciences Meeting Abstracts (2012, October 01)

On February 2012, two stellar occultation's by large Trans-neptunian Objects (TNO's) were observed by our group. On the 3rd, an event by (208996) 2003 AZ84 was recorded from Mont Abu Observatory and IUCAA ... [more ▼]

On February 2012, two stellar occultation's by large Trans-neptunian Objects (TNO's) were observed by our group. On the 3rd, an event by (208996) 2003 AZ84 was recorded from Mont Abu Observatory and IUCAA Girawali Observatory in India and from Weizmann Observatory in Israel. On the 17th, a stellar occultation by (50000) Quaoar was observed from south France and Switzerland. Both occultations are the second observed by our group for each object, and will be used to improve the results obtained on the previous events. The occultation by 2003 AZ84 is the first multi-chord event recorded for this object. From the single chord event on January 8th 2011, Braga-Ribas et al. 2011 obtained a lower limit of 573 +/- 21 km. From the 2012 occultation the longest chord has a size of 662 +/- 50 km. The other chords will permit to determine the size and shape of the TNO, and derive other physical parameters, such as the geometric albedo. The Quaoar occultation was observed from south of France (Observatoire de la Côte d'Azur, TAROT telescope and Valensole) and from Gnosca, Switzerland. Unfortunately, all three sites in France are almost at the same Quaoar's latitude, so in practice, we have two chords that can be used to fit Quaoar's limb. The resulting fit will be compared with the results obtained by Braga-Ribas et al. 2011. Braga-Ribas F., Sicardy B., et al. 2011, EPSC-DPS2011, 1060.Ribas F., Sicardy B., et al. 2011, EPSC-DPS2011, 1060. [less ▲]

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See detailUltraviolet Auroral Pulsations on Saturn from Cassini UVIS
Pryor, Wayne R.; Esposito, L. W.; Jouchoux, A. et al

in AAS/Division for Planetary Sciences Meeting Abstracts (2012, October 01)

Cassini Ultraviolet Imaging Spectrograph (UVIS) observations of Saturn were obtained on 2009 days 278-280 with the UVIS long slit aligned east-west along the northern auroral oval. Bright quasi-periodic ... [more ▼]

Cassini Ultraviolet Imaging Spectrograph (UVIS) observations of Saturn were obtained on 2009 days 278-280 with the UVIS long slit aligned east-west along the northern auroral oval. Bright quasi-periodic localized bursts of UV emission were often observed with 1 hour spacing that slowly moved sub-corotationally along the main auroral arc. We will report on an apparent correlation of the bursts with the locations of Saturn's moons, and a search for other such examples. We will also compare the UVIS results with simultaneous Cassini Imaging Science Subsystem (ISS) auroral images. [less ▲]

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See detailCharon's Size And Orbit From Double Stellar Occultations
Sicardy, Bruno; Braga-Ribas, F.; Widemann, T. et al

in AAS/Division for Planetary Sciences Meeting Abstracts (2012, October 01)

Stellar occultations of a same star by both Pluto and Charon (double events) yield instantaneous relative positions of the two bodies projected in the plane of the sky, at 10km-level accuracy. Assuming a ... [more ▼]

Stellar occultations of a same star by both Pluto and Charon (double events) yield instantaneous relative positions of the two bodies projected in the plane of the sky, at 10km-level accuracy. Assuming a given pole orientation for Charon's orbit, double events provide the satellite plutocentric distance r at a given orbital longitude L (counted from the ascending node on J2000 mean equator), and finally, constraints on its orbit. A double event observed on 22 June 2008 provides r=19,564+/-14 km at L=153.483+/-0.071 deg. (Sicardy et al. 2011), while another double event observed on 4 June 2011 yields: r=19,586+/-15 km at L = 343.211+/-0.072 deg. (all error bars at 1-sigma level). These two positions are consistent with a circular orbit for Charon, with a semi-major axis of a=19,575+\-10 km. This can be compared to the circular orbit found by Buie et al. (2012), based on Hubble Space Telescope data, with a=19,573+/-2 km. The 4 June 2011 stellar occultation provides 3 chords across Charon, from which a radius of Rc= 602.4+/-1.6 km is derived. This value can be compared to that obtained from the 11 July 2005 occultation: Rc= 606.0+/-1.5 km (Person et al. 2006) and Rc= 603.6+/-1.4 km (Sicardy et al. 2006). A third double event, observed on 23 June 2011 is under ongoing analysis, and will be presented. Buie et al. (2012), AJ 144, 15-34 (2012) Person et al, AJ 132, 1575-1580 (2006) Sicardy et al., Nature 439, 52-54 (2006) Sicardy et al., AJ 141, 67-83 (2011) B.S. thanks ANR "Beyond Neptune II". L.A.Y. acknowledges support by NASA, New Horizons and National Geographic grants. We thank B. Barnard, M.J. Brucker, J. Daily, C. Erikson, W. Fukunaga, C. Harlinten, C. Livermore, C. Nance, J.R. Regester, L. Salas, P. Tamblyn, R. Westhoff for help in the observations. [less ▲]

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See detailSpitzer Transits Of The Super-Earth Gj1214b And Implications For Its Atmosphere
Fraine, Jonathan D.; Deming, D.; Gillon, Michaël ULg et al

in AAS/Division for Planetary Sciences Meeting Abstracts (2012, October 01)

We observed the transiting super-Earth exoplanet GJ1214b using Warm Spitzer at 4.5 μm wavelength during a 20-day quasi-continuous sequence in May 2011. The goals of our long observation were to accurately ... [more ▼]

We observed the transiting super-Earth exoplanet GJ1214b using Warm Spitzer at 4.5 μm wavelength during a 20-day quasi-continuous sequence in May 2011. The goals of our long observation were to accurately define the infrared transit radius of this nearby super-Earth, to search for the secondary eclipse, and to search for other transiting planets in the habitable zone of GJ1214. We here report results from the transit monitoring of GJ1214b, including a re-analysis of previous transit observations by Desert et al. (2011). In total, we analyze 14 transits of GJ1214b at 4.5 μm, 3 transits at 3.6 μm, and 7 new ground-based transits in the I+z band. Our new Spitzer data by themselves eliminate cloudless solar composition atmospheres for GJ1214b, and methane-rich models from Howe & Burrows (2012). Using our new Spitzer measurements to anchor the observed transit radii of GJ1214b at long wavelengths, and adding new measurements in I+z, we evaluate models from Benneke & Seager (2012) and Howe & Burrows (2012) using a χ2 analysis. We find that the best-fit model exhibits an increase in transit radius at short wavelength due to Rayleigh scattering. Pure water atmospheres are also possible. However, a flat line (no atmosphere detected) remains among the best of the statistically acceptable models, and better than pure water atmospheres. We explore the effect of systematic differences among results from different observational groups, and we find that the flat line model is the least sensitive to systematic error. [less ▲]

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See detailGene expression profiles in canine idiopathic pulmonary fibrosis
Krafft, Emilie ULg; Heikkilä, H.P.; Peters, I. et al

in Proceedings of 17th International consortium on lung and airways fibrosis (2012, October 01)

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See detailPolicy search in a space of simple closed-form formulas: towards interpretability of reinforcement learning
Maes, Francis ULg; Fonteneau, Raphaël ULg; Wehenkel, Louis ULg et al

in Discovery Science 15th International Conference, DS 2012, Lyon, France, October 29-31, 2012. Proceedings (2012, October)

In this paper, we address the problem of computing interpretable solutions to reinforcement learning (RL) problems. To this end, we propose a search algorithm over a space of simple losed-form formulas ... [more ▼]

In this paper, we address the problem of computing interpretable solutions to reinforcement learning (RL) problems. To this end, we propose a search algorithm over a space of simple losed-form formulas that are used to rank actions. We formalize the search for a high-performance policy as a multi-armed bandit problem where each arm corresponds to a candidate policy canonically represented by its shortest formula-based representation. Experiments, conducted on standard benchmarks, show that this approach manages to determine both efficient and interpretable solutions. [less ▲]

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See detailPotential for application of alkali roast acid leach technology for removal of phosphorus from iron ore
Ionkov, Krassimir ULg; Gaydardzhiev, Stoyan ULg; Bastin, David ULg et al

in Proceedings of 6-th International Congress on the Science and Technology of Ironmaking ICSTI (2012, October)

The present study deals with the effect of sodium hydroxide and sodium carbonate used as additives during oxidizing roasting of oolitic limonite iron concentrate and more precisely upon the change in its ... [more ▼]

The present study deals with the effect of sodium hydroxide and sodium carbonate used as additives during oxidizing roasting of oolitic limonite iron concentrate and more precisely upon the change in its magnetic susceptibility. Further, the efficiency of Alkali Roast Acid Leach (ARAL) technology for dephosphorisation of the concentrate is compared with the case when sodium hydroxide was added in alkali leach after roasting. The treatment without additives in roasting resulted in obtaining iron concentrate with 58 % iron and 0.21 % phosphorus, while the ARAL approach yielded concentrate with 63 % iron and 0.09 % phosphorus. The influence of combination of coke as reducing agent and sodium hydroxide in roasting at 900°C is also investigated and results displayed in 3D form. The combination of ARAL with reductive roasting, grinding of the clinker to 80 % - 0,075 mm, flotation of the non-reacted coke and magnetic separation before and after the acid leach resulted in iron concentrate with 66 % iron and 0.05 % phosphorus. The study has shown that the application of the ARAL approach with low addition of alkalis followed by 10 to 15 minute acid leaching at ambient temperature could substantially reduce phosphorus, thus offering the possibility for efficient treatment of high phosphorus iron ores. [less ▲]

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See detailLes spécificités de la gestion d'une maison de luxe : vers une modélisation atemporelle de la performance
Riguelle, France ULg; Van Caillie, Didier ULg

in AIREPME (Ed.) Actes du CIFEPME 2012 (2012, October)

Le but ultime de la présente recherche est de modéliser la performance des maisons de luxe de manière transversale (nous décidons de ne pas privilégier l’approche marketing comme une grande partie de la ... [more ▼]

Le but ultime de la présente recherche est de modéliser la performance des maisons de luxe de manière transversale (nous décidons de ne pas privilégier l’approche marketing comme une grande partie de la littérature dédiée à la gestion des métiers du luxe) et atemporelle. Nous proposons d’organiser, au travers du Prime de la Performance (Neely, Adams et Kennerley, 2002), les FCS dont la mise en œuvre permet d’atteindre la performance globale. Cette recherche constitue donc un premier pas vers une modélisation de la performance de la maison de luxe. [less ▲]

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See detailAnalyse préalable à une infrastructure de données au Maroc
Ibannain, Fatiha; Donnay, Jean-Paul ULg

in Billen, Roland; Binard, Marc; Hallot, Pierre (Eds.) et al Actes de la conférence internationale de Géomatique et Analyse Spatiale 2012 (2012, October)

In this paper, we discuss ways of promoting a spatial data infrastructure (SDI). Further considerations regulating the organizational infrastructure, the development of tools and models taking into ... [more ▼]

In this paper, we discuss ways of promoting a spatial data infrastructure (SDI). Further considerations regulating the organizational infrastructure, the development of tools and models taking into account the diversity of actors is inevitable to achieve the objectives of an SDI. Our study focused on the technical prerequisites for the establishment of an SDI in Morocco. An ontological approach to the reference spatial data has facilitated the definition of object types when cataloging reference entities, as well the concepts used in conceptual modeling. A feature catalog complying with ISO 19110 is developed using the principles of this ontology illustrating the independence and complementarity of object types, their adaptability to specific application domains and their inheritance. This approach allows establishing a reference model, that is to say a base structure which can be adapted to a wide range of applications. Developments of this work aim to sensitize policy makers about the introduction of an SDI in Morocco. [less ▲]

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See detailFamilial Pituitary Syndromes
Beckers, Albert ULg

in 12th ESE PostGraduate Course in Clinical Endocrinology - Abstract book (2012, October)

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See detailConcept of a mobile automatic milking system and first results at grazing
Dufrasne, Isabelle ULg

in Proceedings 2nd meeting EGF Working Group Grazing - Innovation in grazing (2012, October)

In Europe, farmers have to manage larger herds but, at the same time, want to have a normal social life. So, the automatic milking system (AMS) can bring solutions. This technology implies in most cases ... [more ▼]

In Europe, farmers have to manage larger herds but, at the same time, want to have a normal social life. So, the automatic milking system (AMS) can bring solutions. This technology implies in most cases, the cessation of grazing although grazing is appreciated by the consumers who consider it to be a natural practice. At the experimental farm of the University of Liege, the concept of a mobile milking robot has been developed with a private company. The prototype is used indoors during the winter season and is moved outdoors during the grazing season in pastures romote from the farm. [less ▲]

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See detailEpidemiology and genetics of FIPA
Beckers, Albert ULg

in 15th annual Canadian Society of Endocrinology and metabolism - Abstract book (2012, October)

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See detailUne infiltration de plasma riche en plaquettes (PRP) améliore les symptômes des tendinopathies patellaires supérieures
Kaux, Jean-François ULg; Croisier, Jean-Louis ULg; Rodriguez de la Cruz, Carlos ULg et al

in 5ème Congrès Commun SFMES & SFTS (2012, October)

Introduction : Le plasma riche en plaquettes (PRP) aurait des effets bénéfiques sur les symptômes des tendinopathies grâce à la libération locale de leurs nombreux facteurs de croissance. Le but de cette ... [more ▼]

Introduction : Le plasma riche en plaquettes (PRP) aurait des effets bénéfiques sur les symptômes des tendinopathies grâce à la libération locale de leurs nombreux facteurs de croissance. Le but de cette étude est d’évaluer les résultats d’une injection de PRP sur la symptomatologie des patients présentant une tendinopathie patellaire supérieure. Matériels et Méthodes : Vingt patients atteints d’une tendinopathie patellaire supérieure, rebelle aux traitements conservateurs classiques depuis au moins 3 mois, ont bénéficié d’une évaluation du statut algo-fonctionnel (EVA, algomètre de pression, VISA-P et IKDC) et des performances physqiues (isocinétique et optojump), ainsi que d’un bilan d’imagerie (échographie et IRM). Ces analyses ont été réalisées en pré-injection ainsi qu’aux 6èmeet 12èmesemaines post-injection. Le test isocinétique évaluait la force des quadriceps et des ischios-jambiers des deux membres suivant différentes modalités (C60°/sec, C240°/sec et E30°/sec). Le test Optojump évaluait la détente et la puissance musculaire par la mesure de la hauteur de saut via deux modalités («Counter Movement Jump » et « Drop Jump »). Le PRP est obtenue à l’aide d’une machine d’aphérèse (COM.TEC, Fresenius-Kabi), permettant d’obtenir une concentration plaquettaire reproductible d’un patient à l’autre, en l’absence quasi totale de globules rouges et blancs. L’infiltration intratendineuse de PRP (6mL) est réalisé à la pointe de la rotule in loco dolenti sans anesthésie locale. Résultats : Les résultats de notre expérimentation démontrent qu’une seule injection locale de PRP accompagnée d’un programme de rééducation excentrique améliore significativement la cicatrisation du tendon patellaire au niveau du score EVA, de l’algomètre de pression, des scores VISA-P et IKDC. Lors du test isocinétique, seuls l’augmentation du MFM des ischios jambiers en C240°/sec, de la différence bilatérale des ischios jambiers en C60°/sec ainsi que de l’EVA en E30°/sec était significative. Les résultats optojump en terme de détente et puissance musculaire ne montrent pas d’amélioration des performances. Néanmoins, l’EVA du « Counter Movement Jump » se voit significativement diminuée après l’infiltration. Enfin, les résultats de l’imagerie (échographie et IRM) ne démontrent pas de modification significative du tendon. Conclusions : L’injection locale de PRP dans le cadre de tendinopathies patellaires supérieure permet une diminution de la symptomatologie douloureuse à 6 semaines, se poursuivant à 12 semaines. La performance fonctionnelle et l’imageries, quant à elles, ne sont pas modifiées. [less ▲]

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See detailMultiwavelength Observations of Gamma-ray Binary Candidates
McSwain, M.V.; Chernyakova, M.; Malishev, D. et al

in 2012 Fermi Symposium proceedings - eConf C121028 (2012, October)

There are currently only six known high mass X-­‐ray binaries (HMXBs) that also exhibit MeV, GeV, and/or TeV emission ("gamma-­‐ray binaries"). Expanding the sample of gamma-­‐ray binaries and identifying ... [more ▼]

There are currently only six known high mass X-­‐ray binaries (HMXBs) that also exhibit MeV, GeV, and/or TeV emission ("gamma-­‐ray binaries"). Expanding the sample of gamma-­‐ray binaries and identifying unknown Fermi sources are currently of great interest to the community. Based upon their positional coincidence with the unidentified Fermi sources 1FGL J1127.7-­‐6244c and 1FGL J1808.5-­‐1954c, the Be stars HD 99771 and HD 165783 have been proposed as gamma-­‐ray binary candidates. During Fermi Cycle 4, we have performed multiwavelength observations of these sources using XMM-­‐Newton and the CTIO 1.5m telescope. We do not confirm high energy emission from the Be stars. Here we examine other X-­‐ray sources in the X-­‐ray sources in the field of view that are potential counterparts to the Fermi sources. [less ▲]

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See detailPoly-SiGe-based MEMS Xylophone Bar Magnetometer
Rochus, Véronique; Jansen, R.; Tilmans, H. A. C. et al

in IEEE SENSORS 2012 (2012, October)

This paper presents the design, fabrication and preliminary characterization of highly sensitive MEMS-based Xylophone Bar Magnetometers (XBMs) realized in imec’s poly-SiGe MEMS technology. Key for our ... [more ▼]

This paper presents the design, fabrication and preliminary characterization of highly sensitive MEMS-based Xylophone Bar Magnetometers (XBMs) realized in imec’s poly-SiGe MEMS technology. Key for our Lorentz force driven capacitively sensed resonant sensor are the combination of reasonably high Q-factor and conductivity of imec’s poly-SiGe, our optimized multiphysics sensor design targeting the maximization of the Q-factor in a wide temperature range as well as our proprietary monolithic above-CMOS integration and packaging schemes. Prototypes 3-axis devices were fabricated and characterized. We present optical vibrometer and electrical S-parameter measurements of XBMs performed in vacuum with a reference magnet at increasing sensor separation. The optical oscillation amplitude is well correlated with the magnetic field amplitude. The electrical 2-port measurements, 1st port as Lorentz force actuator and 2nd port as capacitive sensor, also reproduces the designed magnetic field dependence. This opens the way towards the on-chip integration of small footprint extremely sensitive magnetometers. [less ▲]

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See detailExcavation damaged zone modelling in claystone with coupled second gradient model
Collin, Frédéric ULg; Pardoen, Benoît ULg

in Yang (Ed.) Constitutive modeling of Geomaterials, Advances and applications (2012, October)

Galleries excavation leads to damage and significant properties changes of the host rock. The fracture structure of the excavation damaged zone created around the galleries remains nowadays a major issue ... [more ▼]

Galleries excavation leads to damage and significant properties changes of the host rock. The fracture structure of the excavation damaged zone created around the galleries remains nowadays a major issue especially in the context of underground storage. In order to correctly model the strain localisation, the second gradient local model (regularization method) is used within a hydro-mechanical modelling of a gallery excavation. The numerical results provide information about the strain localisation bands pattern. [less ▲]

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See detailFamilial Isolated Pituitary Adenomas
Beckers, Albert ULg

in Syllabus : Canadian Diabetes association : Professional Conference and Annual Meetings (2012, October)

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See detailParenteral nutrition in premature infants, is there a place for a standardized industrialized parenteral nutrition solution
SENTERRE, Thibault ULg

in 4th Congress of the European Academy of Paediatric Societies (2012, October)

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See detailTendinopathies et plasma riche en plaquettes : applications cliniques
Kaux, Jean-François ULg

in 5ème Congrès Commun SFMES & SFTS (2012, October)

Les lésions tendineuses représentent au sein d’une population sportive ou de travailleurs de force une proportion élevée des lésions de surcharge. Leur incidence atteint 30% des pathologies musculo ... [more ▼]

Les lésions tendineuses représentent au sein d’une population sportive ou de travailleurs de force une proportion élevée des lésions de surcharge. Leur incidence atteint 30% des pathologies musculo-squelettiques ; la douleur limite régulièrement les capacités fonctionnelles et athlétiques (1). Actuellement, ces tendinopathies demeurent un défi thérapeutique car certaines évoluent selon un mode désespérément chronique en raison de leur caractère rebelle aux différentes thérapeutiques conservatrices classiques (anti-inflammatoires, rééducation, ondes de choc...). Les infiltrations de plasma riche en plaquettes (PRP) pourraient représenter une alternative espoir thérapeutique suite aux résultats de diverses expérimentations in vitro et animales (2). Les résultats favorables relatés par les médias sportifs contrastent parfois singulièrement avec les études cliniques. Le PRP ne figure plus sur la liste des produits dopants depuis janvier 2011 (www.wada-ama.org) contrairement aux produits sanguins labiles (3).Cette revue actualise le traitement des lésions tendineuses (épicondylite, tendinopathies de coiffe, patellaire et calcanéenne) ainsi que les fasciites plantaires par plasma riche en plaquettes (3). Etant donné le caractère récent de ce traitement dans le domaine médico-sportif, les études cliniques réalisées à ce jour n’ont pas confirmé les effets bénéfiques obtenus in vitro. Certaines études démontrent une amélioration de la symptomatologie suite au traitement par PRP, mais d’autres études apparaissent contradictoires. Cependant, il est communément admis qu’après l’infiltration, une (auto-)rééducation excentrique sous-maximale progressive améliore la qualité de la cicatrisation tendineuse. Le PRP initie un processus cicatriciel, secondairement développé par le vecteur des forces excentriques (4). L’avenir du PRP nécessite une standardisation de la procédure de recueillement permettant d’éviter la collecte des globules rouges et blancs pouvant être délétères au processus cicatriciel (chaque technique produit un PRP différent (5)), ainsi que la réalisation de protocoles standardisés permettant de comparer les futurs travaux. De plus, le type de tendon exercerait-il un effet sur la réponse de guérison ? Celle-ci serait-elle différente entre certains tendons volumineux (calcanéen, patellaire) et les autres (épicondyliens, coiffe des rotateurs...) ? Références: Kaux et al. Current opinion on tendinopathy. Journal of Sports Sciences and Medicine, 2011; 10:238-253. Kaux et al. Effects of platelet-rich plasma (PRP) on the healing of Achilles tendons of rats. Wound Repair and Regeneration, 2012 ; 5: 748-756. Smets et al. Applications cliniques du plasma riche en plaquettes (PRP) dans les lésions tendineuses : revue de la littérature. Science & Sport, 2012; 27:141-153 Kaux et al. Eccentric training improves tendon biomechanical properties: a rat model. Journal of Orthopaedic Research, 2012; DOI: 10.1002/jor.22202 Kaux et al. Etude comparative de cinq techniques de préparation plaquettaire (platelet-rich plasma). Pathologie-Biologie, 2011; 59: 157-160. Plus de références sur orbi.ulg.ac.be [less ▲]

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See detailSimulation-assisted evaluation of potential energy savings: Application to an administrative building in France
Randaxhe, François ULg; Bertagnolio, Stéphane ULg; Lemort, Vincent ULg

in Randaxhe, François; Bertagnolio, Stéphane; Lemort, Vincent (Eds.) International Conference for Enhanced Building Operations ICEBO 2012 at Manchester, October 23-26, 2012 (2012, October)

The case study presented here falls within a project of feasibility studies to improve the energy efficiency, the carbon footprint and the environmental impacts of several administrative buildings in ... [more ▼]

The case study presented here falls within a project of feasibility studies to improve the energy efficiency, the carbon footprint and the environmental impacts of several administrative buildings in France. The first part of the paper briefly presents the data obtained during a classical audit and inspection procedure: the description of the building in term of design, the HVAC system characteristics, the occupancy and operating profiles and the control strategy applied. The second part of the paper gives the first results obtained using an evidence-based calibrated building energy simulation model to analyze the actual building global consumption but also analyze the local consumptions (heat pumps, air handling units, terminal units, lightings, pumps,...). The last part of the paper then demonstrates the possibilities given by the building energy simulation model to evaluate potential energy saving scenarios through different examples. The advantages and drawbacks of the applied methods and tools are also discussed. [less ▲]

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See detailMODELING RELATIONSHIPS BETWEEN JUMP HEIGHT, GROUND CONTACT TIME, REACTIVITY AND STIFFNESS
Jidovtseff, Boris ULg; Apolloni, Jérémy; Harris, Nigel et al

in Abstract book of 8th International Conference on Strength Training (2012, October)

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See detail1RM PREDICTION AND LOAD-VELOCITY RELATIONSHIP
Jidovtseff, Boris ULg; Cronin, John; Crielaard, Jean-Michel ULg et al

in Abstract book of 8th International Conference on Strength Training (2012, October)

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See detailForce musculaire isocinétique du couple quadriceps / ischio-jambiers des joueurs de rugby professionnels
Julia, Marc; Pereira, B.; Morand, D. et al

in Résumés des communications orales SFTS (2012, October)

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See detailOptimizing Early Nutritional Support Based on Recent Recommendations in VLBW Infants.
SENTERRE, Thibault ULg

in 4th Congress of the European Academy of Paediatric Societies (2012, October)

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See detailLos relatos secantes de José Muñoz y Carlos Sampayo / Les Récits sécants de José Muñoz et Carlos Sampayo
Dejasse, Erwin ULg

in Vazquez, Laura (Ed.) Actas del Segundo Congreso Internacional Viñetas Serias: narrativas gráficas: lenguajes entre el arte y el mercado (2012, September 26)

The comics of Muñoz and Sampayo are full of strange characters who surprise by their enigmatic appearance but do not seem to play a particular role in the overall framework of the story. This essay ... [more ▼]

The comics of Muñoz and Sampayo are full of strange characters who surprise by their enigmatic appearance but do not seem to play a particular role in the overall framework of the story. This essay attempts to determine their nature, how they are articulated within the web formed by all the panels and to analyze how they make sense within the context of the oeuvre in its entirety. [less ▲]

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