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See detailRimonabant improves multiple cardiometabolic risk factors in diabetic and non-diabetic overweight/obese patients: data from RIO-diabetes, RIO-Europe, RIO-North America and RIO-Lipids
Scheen, André ULg; Despres, J. P.; Pi-Sunyer, F. X. et al

in European Heart Journal (2006, August), 27(Suppl. 1), 441

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See detailVariations in processing resources and resistance to false memories in younger and older adults
Dehon, Hedwige ULg

in Memory (2006), 14(6), 692-711

The influence of available processing resources on the resistance to false memories (FMs) for lists of semantically related items associated with a non-presented critical lure was examined in younger and ... [more ▼]

The influence of available processing resources on the resistance to false memories (FMs) for lists of semantically related items associated with a non-presented critical lure was examined in younger and older adults. Reducing the available resources at encoding in younger adults (Experiments 1 and 2) led to a performance similar to that of older adults (i.e., higher rates of FMs in addition to reduced rates of correct recall). However, increasing the available resources (Experiments 2 and 3) led to improvements in the rates of correct recall in both age groups and decreased the probability of FMs in younger adults, although warnings had to be added in older adults to obtain similar effects on FMs. Parallel influences on a post-recall test asking participants to report items that they had thought of but did not recall were also found. The influence of available cognitive resources for memory accuracy is also discussed with respect to activation-monitoring (e.g., McDermott [less ▲]

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See detailMultiple Description Coding versus Transport Layer FEC for Resilient Video Transmission
Soldani, Cyril ULg; Verdicchio, Fabio; Leduc, Guy ULg et al

(2006, August)

Video content delivery is a challenging task due to its large bandwidth requirements and its sensitivity to transmission errors. In this context, simultaneously providing scalability and resilience ... [more ▼]

Video content delivery is a challenging task due to its large bandwidth requirements and its sensitivity to transmission errors. In this context, simultaneously providing scalability and resilience against transmission errors is of paramount importance. Layered video coding coupled with multicast video transmission employing no feedback provides the required scalability features and reduces the network burden. However, it is not easy to provide reliability in such environments. This is crucial to mobile users as error rates on wireless links can be high. To compensate for transmission errors, redundancy must be added to the video content. This can be added at the application layer by the employed video coding system, or can be added transparently by the transport layer. In this paper, we compare the performance obtained with a scalable wavelet-based video codec that adds redundancy using multiple description coding with the equivalent system adding redundancy at the transport level, using forward error correction. [less ▲]

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See detailEXPERIENCE GAINED BY THE APPLICATION OF A REAL-TIME VOLTAGE SECURITY ASSESSMENT METHOD AT THE HELLENIC TRANSMISSION SYSTEM OPERATOR
Christoforidis, George; Kabouris, John; Vournas, Costas et al

(2006, August)

Voltage instability is widely recognized as a significant threat of power system blackout. As far as real-time operation is concerned, there is a need for appropriate tools to identify dangerous ... [more ▼]

Voltage instability is widely recognized as a significant threat of power system blackout. As far as real-time operation is concerned, there is a need for appropriate tools to identify dangerous contingencies and assess security margins. The Hellenic Interconnected System presents a structural geographical imbalance between the main generation site and the main load center. This imbalance leads to bulk power transfers over long distances leading to voltage stability problems in areas of the southern system during heavy load conditions. In order to improve the operational practices, a realtime Voltage Security Assessment (VSA) tool has been installed at the National Control Center of the Hellenic Transmission System Operator (HTSO). The scope of VSA is the analysis of the impact of significant contingencies and the determination of security margins in terms of power transfers or power consumption in load areas. The computations performed within the VSA tool are based on a Quasi-Steady-State simulation, a fast time-domain method well suited to the analysis of long-term voltage stability phenomena. VSA is performed on the current system state, provided by the Energy Management System (EMS) state estimator. The VSA application incorporates functions for filtering the contingencies, determining secure operation limits, and deriving post-contingency PV curves for the identified dangerous contingencies. This paper is a description of the experience and the added value gained by the application of the real-time VSA, in parallel with the existing EMS, at the control center of HTSO. [less ▲]

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See detailPALETTE: Grid of Analysis Supporting the Participative Design Methodology
Pironet, Fabienne ULg; Charlier, Bernadette; Daele, Amaury et al

Report (2006)

This deliverable presents the participatory design methodology of the PALETTE project and some first results of the implementation of this process. Some principles of the Actor Network Theory and of the ... [more ▼]

This deliverable presents the participatory design methodology of the PALETTE project and some first results of the implementation of this process. Some principles of the Actor Network Theory and of the Agile Methodology are embedded in the different stages of this methodology whose twelve stages (described in details in the last section) will be the basis of the participative development of services and scenarios of use. The first two stages of the process, establishing the collaboration with the CoPs and modelling their activities, have been implemented. Concrete results are available, i.e. procedures implemented to enrol the partners, methodological tools to gather and analyse the data from the CoPs. Some information has been communicated to partners of WPs 2, 3, 4 and 5 that needed it to progress in the development of their work. This process is not ended; it is iterative and will be refined all along the project. [less ▲]

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See detailLipase production by Yarrowia lipolytica: study of the effects of operating conditions by factorial design of experiments
Lopes, M.; Gomes, I.; Araújo, C. et al

in European Symposium on Biochemical Engineering Science : book of abstracts”. [S.l. : s.n. 2006] (2006, August)

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See detailLeptonic Charged Higgs Decays in the Zee Model
Aristizabal Sierra, Diego ULg; Restrepo, Diego

in Journal of High Energy Physics [=JHEP] (2006), 0608

We consider the version of the Zee model where both Higgs doublets couple to leptons. Within this framework we study charged Higgs decays. We focus on a model with minimal number of parameters consistent ... [more ▼]

We consider the version of the Zee model where both Higgs doublets couple to leptons. Within this framework we study charged Higgs decays. We focus on a model with minimal number of parameters consistent with experimental neutrino data. Using constraints from neutrino physics we (i) discuss the reconstruction of the parameter space of the model using the leptonic decay patterns of both of the two charged Higgses, h(1,2)→ℓj+νi, and the decay of the heavier charged Higgs, h2→h1+h0; (ii) show that the decay rate Γ(h1→μ+νi) in general is enhanced in comparision to the standard two Higgs doublet model while in some regions of parameter space Γ(h1→μ+νi) even dominates over Γ(h1→τ+νi). [less ▲]

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See detailSimulation of annual cycles of phytoplankton, zooplankton and nutrients using a mixed layer model coupled with a biological model
Troupin, Charles ULg

Master of advanced studies dissertation (2006)

In oceanography, the mixed layer refers to the near surface part of the water column where physical and biological variables are distributed quasi homogeneously. Its depth depends on conditions at the air ... [more ▼]

In oceanography, the mixed layer refers to the near surface part of the water column where physical and biological variables are distributed quasi homogeneously. Its depth depends on conditions at the air-sea interface (heat and freshwater fluxes, wind stress) and on the characteristics of the flow (stratification, shear), and has a strong influence on biological dynamics. The aim of this work is to model the behaviour of the mixed layer in waters situated to the south of Gran Canaria island, as well as the annual biological cycles (nutrients, planktons, detritus) which depend on it. To this end the one dimensional version of the ROMS (Regional Ocean Modelling System ) model is applied. The model consists of a physical model coupled with a biological one, with a mixed layer sub-model (K-Profile Parameterization). Initialization is done using mean profiles established from in situ data, forcing is from monthly means of heat fluxes, surface temperature, wind stress and heat flux sensitivity to sea surface temperature. These physical parameters are extracted from climatic databases and averaged over a 10-year period. Their annual variations are interpreted in order to physically predict the resulting behaviour of the mixed layer. The model is tested by means of a sensitivity analysis with respect to the forcing conditions, as well as through a comparison with other models for the case of idealized situations. Simulations are then performed, underlining, in summer, a strong stratification and a shallow mixed layer under the effect of the important heat fluxes; in late winter, a deep mixed layer due to convective mixing, causing an injection of nutrients into the layer and a phytoplankton bloom in February. Sverdrup critital depth euphotic theory is applied in the interpretation of these observations. Finally the model validation is achieved either through in situ data, or through climatic data, bringing to light a qualitative and quantitative agreement between model results and reality, for the physical variables as well as the biological ones. [less ▲]

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See detailSifflements produits par un jet plan accordé heurtant une plaque fendue
Billon, Alexis ULg; Glesser, Martin; Valeau, Vincent et al

Scientific conference (2006, August)

Sous certaines conditions défavorables, les bouches de soufflage des circuits de ventilation peuvent émettre des sifflements désagréables. Ce phénomène, modélisé par l’impact d’un jet plan sur une plaque ... [more ▼]

Sous certaines conditions défavorables, les bouches de soufflage des circuits de ventilation peuvent émettre des sifflements désagréables. Ce phénomène, modélisé par l’impact d’un jet plan sur une plaque fendue, est étudié expérimentalement. Les fréquences des deux instabilités principales, l’instabilité de la couche de cisaillement et le mode de battement du jet, de l’écoulement sans obstacle permettent de définir le domaine d’existence de la fréquence la plus énergétique des sons auto-entretenus produits. Le cas particulier d’un jet accordé est étudié. Cette donnée permet d’anticiper la stratégie de réduction la plus adaptée. [less ▲]

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See detailDiscrete-time synchronization on the N-torus
Sarlette, Alain ULg; Sepulchre, Rodolphe ULg; Leonard, Naomi

in Proceedings of the 17th MTNS Symposium, Kyoto 2006 (2006, August)

In this paper, we study the behavior of a discrete-time network of N agents, each evolving on the circle. The global convergence analysis on the N-torus is a distinctive feature of the present work with ... [more ▼]

In this paper, we study the behavior of a discrete-time network of N agents, each evolving on the circle. The global convergence analysis on the N-torus is a distinctive feature of the present work with respect to previous synchronization results that have focused on convergence in the Euclidean space (R^n)^N. We address the question from a control perspective, but make several connections with existing models, including the Hopfield network, the Vicsek model and the (continuous-time) Kuramoto model. We propose two different distributed algorithms. The first one achieves convergence to equilibria in shape space that are the local extrema of a potential U_L built on the graph Laplacian associated to a fixed, undirected interconnection topology; it can be implemented with sensor-based interaction only, since each agent just relies on the relative position of its neighbors. The second one achieves synchronization under varying and/or directed communication topology using local estimates of a consensus variable that are communicated between interacting agents. Both algorithms are based on the notion of centroid and can be interpreted as descent algorithms. The proposed approach can be extended to other embedded compact manifolds. [less ▲]

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See detailTest comparatif de récepteur GPS
Lejeune, Philippe ULg; Rondeux, Jacques ULg

Poster (2006, July 31)

Des tests, en conditions d'utilisation réelles, ont été réalisés en vue de comparer les performances de différents récepteurs GPS "compact"

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See detailInteractive comment on “On the application and interpretation of Keeling plots in paleo climate research – deciphering d13C of atmospheric CO2 measured in ice cores” by P. Köhler et al.
Munhoven, Guy ULg

in Biogeosciences Discussions (2006), 3

The paper "On the application and interpretation of Keeling plots in paleo climate research – deciphering delta13C of atmospheric CO2 measured in ice cores" by P. Köhler et al. is reviewed and commented.

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See detailFemale sexual maturation and reproduction after prepubertal exposure to estrogens and endocrine disrupting chemicals: A review of rodent and human data
Rasier, Gregory; Toppari, Jorma; Parent, Anne-Simone ULg et al

in Molecular & Cellular Endocrinology (2006), 254-255

Natural hormones and some synthetic chemicals spread into our surrounding environment share the capacity to interact with hormone action and metabolism. Exposure to such compounds can cause a variety of ... [more ▼]

Natural hormones and some synthetic chemicals spread into our surrounding environment share the capacity to interact with hormone action and metabolism. Exposure to such compounds can cause a variety of developmental and reproductive detrimental abnormalities in wildlife species and, potentially, in human. Many experimental and epidemiological data have reported that exposure of the developing fetus or neonate to environmentally relevant concentrations of some among these endocrine disrupters induces morphological, biochemical and/or physiological disorders in brain and reproductive organs, by interfering with the hormone actions. The impact of such exposures on the hypothalamic-pituitary-gonadal axis and subsequent sexual maturation is the subject of the present review. We will highlight epidemiological human studies and the effects of early exposure during gestational, perinatal or postnatal life in female rodents. (c) 2006 Elsevier Ireland Ltd. All rights reserved. [less ▲]

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See detailThe inner debris disc of Vega as seen by CHARA/FLUOR
Absil, Olivier ULg

Scientific conference (2006, July 21)

Using the FLUOR near-infrared beam combiner installed at the CHARA Array (Mt Wilson, CA), we have obtained high-precision interferometric measurements of Vega, a prototypical debris-disk star known to be ... [more ▼]

Using the FLUOR near-infrared beam combiner installed at the CHARA Array (Mt Wilson, CA), we have obtained high-precision interferometric measurements of Vega, a prototypical debris-disk star known to be surrounded by large amounts of cold dust at 80-100 AU in a ring-like structure. The combination of short and long baselines has allowed us to separately resolve the stellar photosphere and its immediate neighbourhood inside by the FLUOR field-of-view of 1’’ (~8 AU at the distance of Vega). Our observations show a significant deficit in visibility at short baselines with respect to the expected visibility of a simple uniform disk stellar model, suggesting the presence of an extended source of emission around Vega. We propose that the visibility deficit is most likely due to the presence of hot circumstellar dust in the inner part of the debris disk, with a flux ratio of 1.29+/-0.19% between the integrated dust emission and the stellar photosphere in K band (2.15 microns). Using this piece of information together with archival photometric and interferometric data in the near- and mid-infrared, we derive the expected physical properties of the dust grains by modelling their infrared Spectral Energy Distribution. Small, highly refractive grains are suspected to be located at only a few 0.1 AU from Vega, with a total mass of about 1e-7 Earth mass. Their presence is thought to be an indicator of major dynamical perturbations currently ongoing in the Vega system. [less ▲]

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See detailSCM : clé essentielle de la performance
Nondonfaz, Robert ULg

Article for general public (2006)

La nécessité de mettre en oeuvre une gestion performante de la Supply Chain afin d'améliorer les performances de l'entreprise et des entreprises liées dans une même Supply Chain

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See detailThe locus ceruleus is involved in the successful retrieval of emotional memories in humans
Sterpenich, Virginie ULg; D'Argembeau, Arnaud ULg; Desseilles, Martin ULg et al

in Journal of Neuroscience (2006), 26(28), 7416-7423

Emotional memories are better remembered than neutral ones. The amygdala is involved in this enhancement not only by modulating the hippocampal activity, but possibly also by modulating central arousal ... [more ▼]

Emotional memories are better remembered than neutral ones. The amygdala is involved in this enhancement not only by modulating the hippocampal activity, but possibly also by modulating central arousal. Using functional magnetic resonance imaging, we analyzed the retrieval of neutral faces encoded in emotional or neutral contexts. The pupillary size measured during encoding was used as a modulator of brain responses during retrieval. The interaction between emotion and memory showed significant responses in a set of areas, including the amygdala and parahippocampal gyrus. These areas responded significantly more for correctly remembered faces encoded in an emotional, compared with neutral, context. The same interaction conducted on responses modulated by the pupillary size revealed an area of the dorsal tegmentum of the ponto-mesencephalic region, consistent with the locus ceruleus. Moreover, a psychophysiological interaction showed that amygdalar responses were more tightly related to those of the locus ceruleus when remembering faces that had been encoded in an emotional, rather than neutral, context. These findings suggest that the restoration of a central arousal similar to encoding takes part in the successful retrieval of neutral events learned in an emotional context. [less ▲]

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See detailBulletin agrométéorologique - Juin 2006
Tychon, Bernard ULg; Ozer, Pierre ULg; De Longueville, Florence ULg et al

in Bulletin Agrométéorologique (2006), 5(3), 1-7

Le mois de juin fut chaud permettant à la plupart des cultures de bénéficier de très bonnes conditions de croissance. Le retard de croissance observé depuis le début du suivi des cultures a quasi ... [more ▼]

Le mois de juin fut chaud permettant à la plupart des cultures de bénéficier de très bonnes conditions de croissance. Le retard de croissance observé depuis le début du suivi des cultures a quasi complètement disparu. La faible pluviométrie constatée au mois de juin n’a pour l’instant que peu de conséquences pour les cultures bien installées vu les réserves en eau accumulées le mois précédent. La situation des cultures est globalement favorable, laissant entrevoir des rendements généralement supérieurs à la moyenne des cinq années précédentes. Toutefois, cette prévision pourrait être revue à la baisse si la période sèche observée en juin se prolongeait en juillet. [less ▲]

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See detailPotential antimalarial activity of indole alkaloids
Angenot, Luc ULg

Conference (2006, July 06)

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See detailGlances at the EC Nitrate Directive implementation in the Walloon Region of Belgium
Marcoen, Jean Marie ULg

Scientific conference (2006, July 04)

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