References of "Scientific congresses and symposiums"
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See detailValidation of a new French-language triage algorithm : the ELISA scale.
Jobe, Jérôme ULg; Ghuysen, Alexandre ULg; GERARD, P. et al

in Critical Care (2010), 14(Suppl1), 277

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See detailA General Method for the Analysis and the Logical Generation of Discrete Mathematical Systems in Programmable Logical Controller
Dubois, Daniel ULg; Mascia, Antonio

in Trappl, Robert (Ed.) CYBERNETICS AND SYSTEMS 2010 (2010)

This paper deals with a general method for the analysis and the logical generation of discrete systems in Programmable Logical Controller (PLC). The Boolean operators are implemented with a generic and ... [more ▼]

This paper deals with a general method for the analysis and the logical generation of discrete systems in Programmable Logical Controller (PLC). The Boolean operators are implemented with a generic and unique algebraic model as event-dependent discrete equations, which can be executed in a sequential order. With this method, a generator of sequential logical tables can be designed, simulated and executed for implementing discrete dynamical systems. The purpose of this research is to design self-rewrite operating systems in PLC, which automatically checks the logic of the implemented discrete dynamical systems, for simulation and execution of sequential operations. [less ▲]

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See detailLes comédiens de Liège à Cologne
Corswarem, Emilie ULg

in Jacobshagen, Arnold; Steinbeck, Wolfram; Van Zahn, Robert (Eds.) Musik im französische Köln (1794-1804) (2010)

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See detailL’électrophorèse capillaire: un outil de choix pour l’analyse chirale
Crommen, Jacques ULg; Rousseau, Anne; Fradi, Ines et al

Conference (2010)

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See detailPulse pressure and pulsatile stress in overweight/obese patients versus lean subjects in absence of hypertension or diabetes.
Scheen, André ULg; Philips, Jean-Christophe ULg; Marchand, Monique ULg

in Obesity Reviews : An Official Journal of the International Association for the Study of Obesity (2010)

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See detailFeasibility study of a Software Defined Radio and its adaptation to space
Heukemes, Mirko; Rainaut, Laurent; Denis, Amandine ULg et al

Poster (2010)

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See detailSynthesis and interfacial properties of bolaform surfactants issued from alkenyl D-xyloside
Deleu, Magali ULg; Bouquillon, Sandrine

in GLEN Congress (2010)

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See detailComparison of mechanical efficiency of two microstructures of Ti5553 alloy in the case of bolted flanges submitted to tensile loading
Van Hoof, T.; Ben Bettaieb, Mohamed ULg; Lani, F. et al

in Steel Research International (2010), 81(9), 1148-1152

A combination of numerical and experimental methods is used to compare the efficiency of two microstructures of Ti5553 titanium alloy in an industrial test case. The test case consists in two parts of ... [more ▼]

A combination of numerical and experimental methods is used to compare the efficiency of two microstructures of Ti5553 titanium alloy in an industrial test case. The test case consists in two parts of sectors of aircraft engine stators linked together by an Inconel bolt and submitted to tensile loading. The efficiency of these microstructures is evaluated by using finite element (FE) models. The chosen FE models take into account elasto-visco-plastic material behaviors, contact with friction (bolt heads/flanges and flange/flange), and the initial bolt tightening. The parameters of the elasto-visco-plastic (EVP) material law are adjusted from experimental results extracted from tensile tests performed on Inconel, and Ti5553 alloys. Viscous properties are observed at different strain rates. The studied alloy is assumed to be plastically isotropic. In order to compare the fracture resistance of both microstructures, a micro-mechanical (damage based) rupture model ([4]) is used as a FE post-processing step. [less ▲]

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See detailServices de soins et services à domicile en Belgique - Inventaire des activités de soin et d'aide chez les infirmières et aides-soignantes
Heyden, Isabelle ULg; Tancredi; Gosset, Christiane ULg

in Revue d'Epidémiologie et de Santé Publique = Epidemiology and Public Health (2010), S58

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See detailModal testing using nonlinear normal modes: experimental demonstration
Peeters, Maxime ULg; Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in Proceedings of the International Conference on Noise and Vibration Engineering (2010)

Modal testing and analysis is well-established for linear vibrating structures. While the common practice is to assume linear behavior, nonlinearity is a frequent occurrence in engineering applications ... [more ▼]

Modal testing and analysis is well-established for linear vibrating structures. While the common practice is to assume linear behavior, nonlinearity is a frequent occurrence in engineering applications and can drastically alter the behavior of mechanical systems. In this paper, an attempt is made to extend experimental modal analysis methodology to a practical nonlinear analog. In this context, nonlinear normal modes (NNMs) offer a solid theoretical and mathematical tool for interpreting a wide class of nonlinear dynamical phenomena, yet they have a clear and simple conceptual relation to the classical linear normal modes. Based on a nonlinear extension of phase resonance testing (also called force appropriation), the proposed methodology excites the structure to isolate one single NNM during the experiments. Thanks to the invariance principle, the energy dependence of that nonlinear mode (i.e., the NNM modal curves and their frequencies of oscillation) can be extracted from the resulting free decay response using time-frequency analysis. The proposed method is demonstrated using an experimental cantilever beam with a geometrical nonlinearity. [less ▲]

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See detailLe livre de prière de Robert et Marguerite, seigneur et dame de Wavrin (fin du XIVe siècle)
Marchandisse, Alain ULg; Schnerb, Bertrand

in Publication du Centre Européen d'Etudes Bourguignonnes (2010), 50

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See detailAssessment of ventricular-arterial coupling with a model-based sensor
Desaive, Thomas ULg; LAMBERMONT, Bernard ULg; GHUYSEN, Alexandre ULg et al

in Proceedings of CONTROL 2010 (2010)

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See detailConscience du fonctionnement de la mémoire dans la maladie d’Alzheimer
Jaspar, Mathieu ULg; Feyers, Dorothée ULg; Bastin, Christine ULg et al

in Proceedings du XIeme colloque international sur le vieillissement cognitif (2010)

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See detailElectrical resistivity tomography and self-potential case studies for fractured aquifer characterization and monitoring
Robert, Tanguy ULg; Dassargues, Alain ULg; Nguyen, Frédéric ULg

in Geophysical Research Abstracts (2010), 12

Electrical resistivity tomography (ERT) and self-potential (SP) investigations have been conducted in complex carboniferous limestones aquifers in Belgium (synclinorium structures). The aims of this study ... [more ▼]

Electrical resistivity tomography (ERT) and self-potential (SP) investigations have been conducted in complex carboniferous limestones aquifers in Belgium (synclinorium structures). The aims of this study were (1) to detect and characterize fractured zones in hard rock aquifers, (2) to monitor groundwater flow/water content in these fractured or karstic areas and (3) to use geophysical data to support groundwater flow model set-up and calibration. The investigated areas lie in calcareous synclines. Electrical images allowed us to detect and characterize (in terms of direction, width and depth) several less resistive anomalies, which are interpreted in terms of fractured and/or karstic zones. To interpret the ERT images, data errors as well as image appraisal indicators (resolution matrix, sensitivity matrix and DOI index) were analysed and compared. This allowed us to determine the depth of investigation of ERT and to avoid the misinterpretation of the resulting images. Inversions based on focusing scheme are tested against smoothness-constraint inversion on these field data to provide more realistic images on the basis of prior geological knowledge. Self-potential measurements were performed along the electrical profiles and allowed us to find negative anomalies possibly related with groundwater preferential flow pathways. By taking the assumption that only the electrokinetic effect plays a role in the SP signals, we were able to estimate a first distribution of the water table along our profiles. The SP data showed that in this particular tectonic structure, two perpendicular hydraulic gradients are present. The first gradient is related with the main fold axis direction and is the major drainage system. The second hydraulic gradient is related with the flanks of the calcareous valley. Geophysical data concurrently with ‘ground truth’ geological and hydrogeological data allowed us to better understand the groundwater flow in these calcareous synclines and to verify the conceptual groundwater flow model. [less ▲]

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See detailBluetongue in wild cervids: actual situation in Belgium
Linden, Annick ULg

Conference (2010)

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See detailY'a-t-il des missionnaires congolais en Belgique
Demart, Sarah ULg

Conference (2010)

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See detailSpecies effect on the water use efficiency of a mixed forest of beech (Fagus sylvatica L.), Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) and silver fir (Abies alba Mill.) in Belgium Ardennes
Soubie, Rémy; Heinesch, Bernard ULg; Aubinet, Marc ULg et al

Poster (2010)

Induced by climate change, intensity and frequency of droughts should be more important for the next century. How does water availability affect the physiology of woody plants at the species and stand ... [more ▼]

Induced by climate change, intensity and frequency of droughts should be more important for the next century. How does water availability affect the physiology of woody plants at the species and stand scale? Carbon and water vapour fluxes measurements of a mixed forest (deciduous and coniferous) were performed for over ten years by the eddy covariance method in Belgian Ardennes (Aubinet et al, 2001) as a part of the CarboEurope project. Whereas carbon fluxes have been analyzed in detailed and good estimations of the Net Ecosystem Exchange (NEE) and Gross Primary Production (GPP) were obtained, a thorough analysis of water vapour fluxes remains to be done. Improving analysis of water vapour fluxes and monitoring species transpiration will contribute to the estimation of the water use efficiency, WUE, at both the species and stand scale. The WUE well characterizes the vegetation productivity and ecosystem response to environmental factors. It also allows evaluating the sensitivity of temperate woody species to drought. The species concerned are beech (Fagus sylvatica L.), Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) and silver fir (Abies alba Mill.). Since summer 2009 we monitor and analyze each species water use by measuring sap flow with the thermal dissipation method (Granier, 1987). Results at the species level will then be upscaled and compared to stand water vapour fluxes measurements obtained by the eddy covariance methodology. Transpiration of each species will be analyzed in relation with their own phenological and ecophysiological attributes, ecosystem soil and atmospheric conditions, to clarify among others their behaviour in case of water deficit. Data are actually analysed, the presented results will concern the 2009, and a part of 2010 growing season. [less ▲]

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See detailHeurs et malheurs de la grammaire en didactique des langues étrangères: redéfinitions, restructurations, réorientations
Defays, Jean-Marc ULg

in GRAMM-R. Etudes de Linguistique Française = GRAMM-R. Studies of French Linguistics (2010), 4

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See detailRestauration des campos rupestres, une physionomie du biome Cerrado menacé par le changement d’usage des terres
Le Stradic, Soizig ULg; Buisson, Elise; Fernandes, Geraldo Wilson

Poster (2010)

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See detailIs transforming growth factor- beta 1 involved in the pathogenesis of IPF in dogs ?
Krafft, Emilie ULg; Heikkilä, H. P.; De Lorenzi, D. et al

in Proceedings of the 20th Annual Congress of the ECVIM-CA (2010)

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See detailFinger Tapping feature extraction in Parkinson's disease using low-cost accelerometers
Stamatakis, Julien; Cremers, Julien ULg; Macq, Benoït et al

in Proceedings 10th IEEE International Conference on Information Technology and Applications in Biomedicine (ITAB 2010) (2010)

The clinical hallmarks of Parkinson's disease (PD) are movement poverty and slowness (i.e. bradykinesia), muscle rigidity and limb tremor. The physicians usually quantify these motor disturbances by ... [more ▼]

The clinical hallmarks of Parkinson's disease (PD) are movement poverty and slowness (i.e. bradykinesia), muscle rigidity and limb tremor. The physicians usually quantify these motor disturbances by assigning a severity score according to validated but time-consuming clinical scales such as the Unified Parkinson's Disease Rating Scale (UPDRS) - part III. These clinical ratings are however prone to subjectivity and inter-rater variability. The PD medical community is therefore looking for a faster and more objective rating method. As a first step towards this goal, a tri-axial accelerometer-based system is proposed as patients are engaged in a repetitive finger tapping task, which is classically used to assess bradykinesia in the UPDRS-III. After developing the hardware, an algorithm has been developed, that automatically epoched the signal on a trial-by-trial basis and quantified, among others, movement speed, amplitude, hesitations or halts as validated by visual inspection of video recordings during the task. The results obtained in a PD patient and an healthy volunteer are presented. Preliminary results show that PD patients and healthy volunteers have different features profiles, so that a classifier could be set up to predict objective UPDRS-III scores. [less ▲]

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See detailThe critical role of carbohydrate administration in safe, effective TGC
PREISER, Jean-Charles ULg; Suhaimi, F; Chase, JG et al

in Clinical Nutrition (2010), 5 (Suppl 2):111

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See detailCellular engineering of Bacillus subtilis to enhance the biosynthesis of highly active anti fungal lipopeptides
Guy, J.; Guez, Jean-Sébastien; Coucheny, F. et al

Poster (2010)

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See detailCharacterization of the antimicrobial activity of mycosubtilin on the plasma membranes. A biomimetic approach
Nasir, Mehmet Nail ULg; Besson, Françoise

Poster (2010)

Mycosubtilin, an antimicrobial lipopeptide, is produced by Bacillus subtilis strains. It belongs to the iturin family, which is characterized by the presence of a peptide part, constituted of a constant ... [more ▼]

Mycosubtilin, an antimicrobial lipopeptide, is produced by Bacillus subtilis strains. It belongs to the iturin family, which is characterized by the presence of a peptide part, constituted of a constant chiral amino acid sequence cycled by a β-amino fatty acid (Fig. 1). As all the iturinic lipopeptides, mycosubtilin exhibits its biocide activities on cytoplasmic membrane of target cells [1]. Recently, the activity of mycosubtilin on pathogenic strains resistant to classical agents was shown [2]. However, despite many works focused on its structure and the optimization of its production, only a few studies are conducted to analyze mycosubtilin-membrane interactions. The purpose of our work was to better understand, at the molecular level, the mechanisms of the mycosubtilin activity on cytoplasmic membranes. Firstly, we modelled the mycosubtilin-membrane interactions by using biomimetic monolayers and their associated techniques (tensiometry and PM-IRRAS). After characterizing the interfacial properties of pure mycosubtilin [3], we used Langmuir films to investigate the mycosubtilin behavior when the lipopeptide reaches the external leaflet of the membrane. We found that the mycosubtilin adsorption to lipid monolayers depended on their lipid composition and the lipopeptide interaction with the membrane was facilitated by the presence of sterols. Then, we mimicked the insertion of the lipopeptide in the whole membrane by using multilamellar vesicles. FT-IR spectroscopy analysis showed that the interaction of mycosubtilin with the artificial membranes induced conformational changes of the lipopeptide only in the presence of sterol. 1. Maget-Dana R, Peypoux F. (1994) Toxicology 87:151-74. 2. Fickers P, Guez JS, Damblon C, Leclère V, Béchet M, Jacques P, Joris B. (2009) Appl. Environ. Microbiol. 75:4636-40. 3. Nasir MN, Thawani A, Kouzayha A, Besson F. (2010) Colloids Surf. B Biointerfaces 78 :17-23. [less ▲]

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See detailGenetic analysis of a glomerulonephropathy segregating in a pedigree of French Mastiff.
Battaille, Géraldine ULg; Lavoué, Rachel ULg; Peeters, Dominique ULg et al

in Proceedings of 32nd Annual Conference of the International Society of Animal Genetics (2010)

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See detailPreparation of CMI-1 supported H3+xPMo12-xVxO40 for the selective oxidation of propylene
Benadji, S.; Eloy, P.; Léonard, Alexandre ULg et al

in Studies in Surface Science and Catalysis (2010), 175

Catalysts, comprising 30 wt.% of heteropolyacids (HPAs) H 3+xPMo 12-xV xO 40 (x = 0-3) supported on a mesoporous material CMI-1 by dry impregnation were characterized by several techniques. Their ... [more ▼]

Catalysts, comprising 30 wt.% of heteropolyacids (HPAs) H 3+xPMo 12-xV xO 40 (x = 0-3) supported on a mesoporous material CMI-1 by dry impregnation were characterized by several techniques. Their catalytic performances were compared to those of bulk HPAs in the propylene oxidation by molecular oxygen at 350°C. The supported HPAs exhibit higher catalytic activity in propylene oxidation than the bulk ones and favoured the formation of acrolein, acetaldehyde and acetic acid, compared to the mother catalysts which lead only to the formation of COx. The enhanced oxidation catalytic activity of supported systems was attributed to the fine dispersion of H 3+xPMo 12-xVxO 40 species on the CMI-1 mesoporous material via physical adsorption, together with the fact that the structure of both CMI-1 and HPAs remained intact during the impregnation. © 2010 Elsevier B.V. All rights reserved. [less ▲]

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See detailExpériences belges en matière d’équité salariale
Cornet, Annie ULg

Conference (2010)

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See detailTime varying elastance estimation in an 8 camber cardiovascular system model
Desaive, Thomas ULg; Chase, J. G.; Hann, C. E. et al

in Intensive Care Medicine (2010), 36(2), 151-151

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See detailDesign and production of Ti6Al4V bone scaffolds by selective laser melting
Van Bael, Simon; Kerckhofs, Greet ULg; Moesen, Maarten et al

Conference (2010)

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See detailAutomatic stimulus-induced medial premotor cortex activation without perception or action
D'Ostilio, Kevin ULg; Garraux, Gaëtan ULg

Poster (2010)

Evidence from functional imaging studies suggests that well-established stimulus-action associations may induce an automatic activation of the motor preparation system even when there is no intention to ... [more ▼]

Evidence from functional imaging studies suggests that well-established stimulus-action associations may induce an automatic activation of the motor preparation system even when there is no intention to make the associated movement (Grezes & Decety, 2002). Here we investigated whether this automatic motor activation can also be elicited by visual stimuli that are not consciously perceived. However, previous subliminal masked experiments used supraliminal response-target in such a way that unconscious mechanisms were inferred from the accumulation of the effect of the subliminal masked stimulus and the motor response. Here, to investigate neural correlates of unconscious process induced by subliminal stimuli, we used event-related BOLD fMRI at 3T to record brain activity in 24 healthy volunteers (mean age: 21 ± 2 years) as they performed a subliminal priming task (see Eimer & Schlaghecken, 1998). In this visuomotor task, participants were asked to make speeded button presses with the left or right hand following double leftward (<< <<) or rightward (>> >>) pointing arrows, which were preceded by a masked subliminal prime of 17 ms (compatible/incompatible arrows or neutral stimulus). Reaction time analysis revealed the classical positive compatibility effect (PCE), mainly shorter reaction times for compatible (mean RT: 369±38 ms) than for incompatible (mean RT: 383± 30 ms) in comparison to neutral trials (mean RT: 375± 38 ms). In a prime identification task, subjects’ performance was at chance level for primes presented for 17 ms, suggesting that the prime was not consciously perceived in the main experiment. Theses behavioral results suggest an automatic and unconscious motor activation induced by the prime. The responded stimuli were randomly intermixed with non-responded stimuli (0 0) with the assumption that the subliminal arrow prime also elicited an automatic motor activation in these passive trials as in responded trials. Imaging analysis of these non-responded trials showed first that activation was mainly restricted to posterior brain areas when using a subliminal stimulus that has not been previously associated with a motor response. Second, when the subliminal stimulus has been strongly associated with a motor response, this activation extended to rostral brain regions classically involved in motor preparation as the SMA, the premotor cortex and the striatum (cluster level p< 0.05 corrected). This finding corroborates the involvement of a fronto-striatal network, especially of the SMA in automatic and unconscious motor activation. [less ▲]

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See detailModeling post-combustion CO2 capture with amine solvents
Léonard, Grégoire ULg; Heyen, Georges ULg

Conference (2010)

Oral communication at the Cape-forum, Aachen, 2010. Modeling CO2 capture process and optimization of some process parameters with an equilibrium-based model.

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See detailInformation-Theoretic Inference of Gene Networks Using Backward Elimination.
Meyer, Patrick ULg; Marbach, Daniel; Roy, Sushmita et al

in BIOCOMP'10 (2010)

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See detailExploration of perceptual and motor inhibition in children with traumatic brain injury
Catale, Corinne ULg; Lejeune, Caroline ULg; Meulemans, Thierry ULg

Poster (2010)

Inhibitory control, which is commonly considered as one of the essential components of executive functions (Barkley, 1997; Miyake et al., 2000), is not considered as an unitary construct (for example ... [more ▼]

Inhibitory control, which is commonly considered as one of the essential components of executive functions (Barkley, 1997; Miyake et al., 2000), is not considered as an unitary construct (for example, Friedman & Miyake, 2004; Nassauer & Halperin, 2003). In this study, perceptual and motor inhibition were studied in 12 children who had sustained a moderate to severe traumatic brain injury and in 24 matched control children, with the Conflict Resolution task (Nassauer & Halperin, 2003). The perceptual inhibition task required the children to respond to the direction of an arrow while ignoring the conflicting arrow location. In the motor inhibition task, the subject had to press a key corresponding to the opposite direction of a centrally located arrow. Direct comparisons of inhibition performances between traumatic brain injury children and matched controlled subjects showed a specific and disproportionate impairment for motor inhibition (compared to perceptive inhibition) in the traumatic brain injury children, suggesting that inhibition processes might be differentially impaired after traumatic brain injury in children. Interestingly, impairments in behavioural inhibition in day-to-day activities (as reported by the parents), was found to strongly correlate with both types of inhibition. [less ▲]

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See detailMaillage 3D par imagerie RMN d’un grain de maïs et modélisation des transferts de chaleur et de masse durant son séchage
Janas, Sébastien ULg; Boutry, Sébastien; Vander Elst, Luce et al

Poster (2010)

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See detailUltraviolet aurorae and dayglow in the upper atmospheres of terrestrial planets
Gérard, Jean-Claude ULg; Hubert, Benoît ULg; Gustin, Jacques ULg et al

in 38th COSPAR Scientific Assembly (2010)

Since its discovery in 2005 with the SPICAM spectrograph on board Mars Express, the Mars aurora has been further investigated. It is caused by sporadic soft electron precipitation whose signature is ... [more ▼]

Since its discovery in 2005 with the SPICAM spectrograph on board Mars Express, the Mars aurora has been further investigated. It is caused by sporadic soft electron precipitation whose signature is clearly observed in the FUV nightglow spectrum. The characteristics of the auroral electrons have been documented with parallel observations. Dayglow UV spectra have been collected with SPICAM over several seasons. The dependence of the intensity and peak altitude of the CO Cameron bands and CO2 + doublet emissions on latitude, local time and solar activity level have been investigated and compared with the results of a FUV Mars dayglow model. Far and Extreme ultraviolet spectra have been collected with the UVIS instrument during the flyby of Venus by Cassini, in a period a high solar activity. Their analysis shows the presence of OI, OII, NI, CI, CO and CO2 + emissions, some of them not previously identified in the Venus spectrum. The intensities will be compared with those observed with the HUT spectrograph during a period of low solar activity. The excitation processes of the observed features will be discussed. Scans of the intensity variation of several EUV bright emissions such as OII 83.4 nm, OI 98.9 nm and NI 120.0 nm multiplets across the sunlit disc will be compared with the calculations of a Venus dayglow model, including multiple scattering of optically thick transitions. [less ▲]

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See detailProsodic marking of information status in Dutch and French as foreign languages. Production and perception
Rasier, Laurent ULg; Caspers, Johanneke; Van Heuven, Vincent

Conference (2010)

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See detailResponse inhibition toward alcohol cues in heavy drinkers and alcohol dependent patients
Kreusch, Fanny ULg; Quertemont, Etienne ULg

in Alcoholism, Clinical & Experimental Research (2010), 34(8), 139-139

Alcohol addictive behaviors have been recently associated with a combination of deficits in executive function, such as a weak response inhibition, and potent automatic appetitive responses for alcohol ... [more ▼]

Alcohol addictive behaviors have been recently associated with a combination of deficits in executive function, such as a weak response inhibition, and potent automatic appetitive responses for alcohol-related cues. The aim of the present studies was to investigate response inhibition for alcohol and neutral or soft drink cues in alcohol abusers and alcohol dependent patients. Response inhibition was assessed in a go/nogo task with pictures of alcohols, soft drinks or neutrals objects. In this task, participants had to respond to specific stimuli (go trial) and inhibit that action under a different set of stimuli (nogo trial). Faster responses for alcohol in go trials reflect approach tendency for alcohol cues while false alarm responses for alcohol in nogo trials reflect a deficit in response inhibition toward alcohol-related cues. Moreover, since standard alcohol cues are not equally appreciated across participants, the preference for the different alcoholic drinks presented were measured and analyzed in reference to task responses. Both light and heavy drinkers showed faster responses to alcohol cues in go trial relative to soft/neutral cues. Preliminary results indicate a negative relationship between the preference scores for alcohols and the reaction times to those stimuli in go trials. The present study also demonstrated that the presence of brands logo significantly altered the discrimination and reactions time patterns of response to alcohol and soft cues. [less ▲]

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See detailVideo analysis for continuous sign language recognition
Piater, Justus ULg; Hoyoux, Thomas ULg; Du, Wei ULg

in 4th Workshop on the Representation and Processing of Sign Languages: Corpora and Sign Language Technologies (2010)

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See detailMaterial parameter identification of Cazacu's model for Ti6Al4V using the simulated annealing algorithm
Gilles, Gaëtan ULg; Habraken, Anne ULg; Duchene, Laurent ULg

in Materials Science Forum (2010), 636-637

Phenomenological yield criteria are generally described by many material parameters. A technique to identify these parameters is required to find the best fit to the results of the mechanical tests. The ... [more ▼]

Phenomenological yield criteria are generally described by many material parameters. A technique to identify these parameters is required to find the best fit to the results of the mechanical tests. The parameter identification by the classical simulated annealing technique is presented in this paper. This algorithm, based on Metropolis’ works [1,2], is a global optimization method that distinguishes between different local optima to reach the global optimum. The anisotropic model used in this study is the one proposed by [3]. To prove the efficiency of the proposed algorithm, the material parameters of Ti6Al4V titanium alloy are identified and compared with those obtained using different identification procedures and the same experimental data. [less ▲]

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See detailIncidence of sport injuries in elite young athletes of the Grand-duchy of Luxembourg
Frisch, Anne ULg; Urhausen, A.; Seil et al

in Buys, R.; Buerkers, M.; Daly, D. (Eds.) Programma boek final of the 12th International ACAPS Conference (2010)

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See detailÀ l’école du cloître au XVIIe siècle : formation et éducation dans les ordres contemplatifs féminins (Pays-Bas méridionaux et Principauté de Liège),
Henneau, Marie-Elisabeth ULg

in Mostaccio, Silvia; Delville, Jean-Pierre (Eds.) Genre et identités aux Pays-Bas méridionaux. L’éducation des femmes après le Concile de Trente (2010)

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See detailImplicit Real Vector Automata
Boigelot, Bernard ULg; Brusten, Julien ULg; Degbomont, Jean-François ULg

in Electronic Proceedings in Theoretical Computer Science (2010), 39

This paper addresses the symbolic representation of non-convex real polyhedra, i.e., sets of real vectors satisfying arbitrary Boolean combinations of linear constraints. We develop an original data ... [more ▼]

This paper addresses the symbolic representation of non-convex real polyhedra, i.e., sets of real vectors satisfying arbitrary Boolean combinations of linear constraints. We develop an original data structure for representing such sets, based on an implicit and concise encoding of a known structure, the Real Vector Automaton. The resulting formalism provides a canonical representation of polyhedra, is closed under Boolean operators, and admits an efficient decision procedure for testing the membership of a vector. [less ▲]

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See detailAn almost Anti-Windup scheme for plants with magnitude, rate and curvature saturation
Forni, Fulvio ULg; Galeani, Sergio; Zaccarian, uca

in American Control Conference (ACC 2010) (2010)

We address the anti-windup augmentation problem for plants with saturations on the magnitude, rate and curvature of the control input. To this aim, given an unconstrained closed-loop, we generate a ... [more ▼]

We address the anti-windup augmentation problem for plants with saturations on the magnitude, rate and curvature of the control input. To this aim, given an unconstrained closed-loop, we generate a slightly modified strictly proper controller for which the derivatives of the control signal are available and we solve the anti-windup problem for this modified control scheme (namely, an almost anti-windup for the original closed-loop). Based on this “almost” approach, we revisit an existing Model Recovery anti-windup solution for rate and magnitude saturated plants and then we extend the results to the case of rate, magnitude and curvature saturation, by providing a Model Recovery solution to this additional problem. An example illustrates the peculiarities and the effectiveness of the proposed solutions. [less ▲]

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See detailEuropean Union-Africa Partnership on cotton
Berti, Fabio ULg

Conference (2010)

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See detailLa perception de la douleur chez les patients en éveil de coma
Chatelle, Camille ULg

Conference (2010)

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See detailDiagnostic de l’exploration botanique des Caesalpinioideae et Mimosoideae de l’Afrique centrale
Ndayishimiye, J; Bamba, I; Stoffelen, P et al

Poster (2010)

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See detailThe Na-rich phosphate minerals from Malpensata granitic pegmatite, Piona, Lecco province, Italy
Vignola, Pietro; Hatert, Frédéric ULg; Fransolet, André-Mathieu ULg et al

in Acta Mineralogica-Petrographica, Abstract series (2010), 6

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See detail80 years of industrial dry hopping knowledge
Derdelinckx, Guy; Daenen, Luk; Rock, Jean-Marie et al

in EBC hop symposium 2010 (2010)

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See detailMiniaturization induced size effects: Experimental and numerical investigation of size effects linked to the miniaturization of metallic components
Keller, Clément ULg; Habraken, Anne ULg; Hug, E. et al

in Scale transition for plastic crystalline and microstructured materials: from experiment to numerical modeling (2010)

The manufacturing of small metallic components for MEMS is a great challenge for industries. However, the lack of knowledge about the mechanical behavior of metals when they are employed in small ... [more ▼]

The manufacturing of small metallic components for MEMS is a great challenge for industries. However, the lack of knowledge about the mechanical behavior of metals when they are employed in small components can reduce the economical development of MEMS due to manufacturing and reliability issues. The objective of this work is to provide new scientific results to improve the understanding of the mechanical properties of micro-components. Experimental and numerical (strain gradient plasticity model) tensile tests are performed on thin nickel single crystals and polycrystals (thickness larger than 10 m) showing different size effects depending on the dimensions of the samples. These effects are then taken into account in new simplified numerical models for the prediction of micro-forming processes. [less ▲]

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See detailFeasibility of a genetic evaluation for milk fatty acids in dairy cattle
Soyeurt, Hélène ULg; Arnould, Valérie ULg; Vanderick, Sylvie ULg et al

in Journal of Dairy Science (2010), 93(E-Suppl 1), 744

Recent development of equations based on mid-infrared (MIR) spectrometry for the prediction of milk fatty acid (FA) contents allows their measurement on a large scale during performance recording. The ... [more ▼]

Recent development of equations based on mid-infrared (MIR) spectrometry for the prediction of milk fatty acid (FA) contents allows their measurement on a large scale during performance recording. The objective was to show that a genetic evaluation for milk FA in dairy cattle is feasible in the Walloon region of Belgium and to report first results. Estimated breeding values (EBV) and associated reliabilities (REL) were computed using a multi-trait test-day animal model similar to the one used for the routine genetic evaluation for yield traits. Studied traits were first lactation test-day milk, fat and protein yields, fat (FAT) and protein contents, and content of saturated fatty acids in milk (g/100g of milk, SAT). More than 6,700,000 records were available for common production and content traits and 194,000 records were used for SAT. Used variance components were estimated using REML. The average SAT content was 2.79% with a standard deviation (SD) of 0.50%. A total of 1,707 Holstein bulls used in Walloon Region had REL superior to 0.49 for all studied traits. REL for SAT ranged from 0.53 to 0.99. A total of 1,217 bulls had REL superior to 0.74. SD of EBV for SAT was 0.20%. The maximum and minimum SAT EBV values were 0.89% and -0.69%, respectively. In order to have a direct measure of the part of FAT that is not due to SAT, a new trait (dSAT) was post-evaluated and defined as difference between expected SAT EBV for a given FAT EBV and the estimated EBV for SAT. This new trait can be assumed to be a direct predictor of the content of unsaturated fatty acids in fat. The interest is that this trait cannot be accurately predicted directly by MIR. The maximum and minimum EBV for dSAT for the 1,707 bulls were -0.28% and 0.24%, respectively. Based on these results, a genetic evaluation for milk fatty acids is feasible. In the bull population used recently, a genetic variability for dSAT exists and could be used to improve the milk fat composition. [less ▲]

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See detailQuelles pratiques pour favoriser la transition secondaire-université ? Regard sur les programmes d'histoire
Jadoulle, Jean-Louis ULg

in DUFAYS, Jean-Louis (Ed.) Quelles pratiques didactiques pour favoriser la transition secondaire-université ? Gros plan sur les programmes du 3e degré de l'enseignement secondaire de transition (2010)

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See detailValue chain analysis of beef cattle production in different cattle feeding systems in Bac Kan Province
Hoang, Thi Huong Tra ULg; Lebailly, Philippe ULg; Vu Chi, Cuong et al

in The North-South Centre of the ETH Zurich (Ed.) Tropentag 2010 : World food system : a contribution from Europe (2010)

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See detailImproving the grinding performance in ball mills with a conductive and inductive sensor
Köttgen, Axel ULg; de Haas, Bernard; Keshav, Pratish et al

Poster (2010)

A series of tests were conducted in a South African concentrator on the secondary grinding mill. The results were analysed and provided showed the importance of selecting an optimum density and filling ... [more ▼]

A series of tests were conducted in a South African concentrator on the secondary grinding mill. The results were analysed and provided showed the importance of selecting an optimum density and filling degree of the mill. Moreover, a Sensomag (r) is installed on this mill and the surveys showed that an increase of the density was improving the mixing of balls in the pulp and increasing the grinding performance. [less ▲]

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See detailLes lendemains des guerres burgondo-liégeoises du XVe siècle
Marchandisse, Alain ULg; Coura, Geneviève

in Pernot, François; Toureille, Valérie (Eds.) Lendemains de guerre ... : de l'Antiquité au monde contemporain : les hommes, l'espace et le récit, l'économie et le politique (2010)

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See detailDE LA CULTURE ITINERANTE SUR BRULIS AUX JACHERES ENRICHIES PRODUCTRICES DE CHARBON DE BOIS, EN R. D. DU CONGO
Peltier, Régis; Bisiaux, Franck; Dubiez, Emilien et al

Conference (2010)

—From slash-and-burn to slash-and-charcoal in R.D. Congo Kinshasa, the capital of the Democratic Republic of the Congo, has some 8 million inhabitants and is mainly surrounded by savanna and patches of ... [more ▼]

—From slash-and-burn to slash-and-charcoal in R.D. Congo Kinshasa, the capital of the Democratic Republic of the Congo, has some 8 million inhabitants and is mainly surrounded by savanna and patches of degraded forest. Estimated fuelwood consumption is in the range of 3 to 6 million tones of fuelwood equivalent per year (representing 0.6 to 1.2 MT of charcoal per year if all the wood were charcoaled). The Mampu project was designed as the pilot phase of a reforestation project covering 100 000 hectares of sandy soil on the Bateke plateau and aiming to remedy wood and charcoal scarcities. Despite the conflicts, about 8000 hectares of Acacia auriculiformis were planted, mainly from 1987 to 1993. From about 1994, the Mampu plantation was divided into 25 hectare plots for 320 farming families. Cultivation mainly follows the agroforestry pattern based on improved fallows, which draws on traditional slash-and-burn farming. Total charcoal production from the plantation varies from 8 000 to 12 000 tonnes per year, in addition to 10 000 T/year of cassava, 1 200 T/year of maize and 6 T/year of honey. The success of the project is an incentive to apply the model to the savanna lands on the Bateke plateaus, taking traditional land rights into consideration and continuing activities to diversify and process production locally. This will help to cover a larger share of urban needs for renewable energy while also creating rural employment. However, other agroforestry systems deserve to be tested or developed for different ecological and social or economic conditions across the country, such as management of the natural regrowth of local multiple-use species as applied with the traditional system of fallow enrichment (Nkunku) in the Lower Congo. [less ▲]

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See detailEtudier à l'université : le poids des pairs et du capital culturel face aux aspirations d'étude
Dupriez, Vincent; Van Campenhoudt, Maud; Monseur, Christian ULg et al

Conference (2010)

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See detailImprimeurs en Brabant et en Flandre au temps de Philippe le Beau
Adam, Renaud ULg

in Wijsman, Hanno (Ed.) Books in Transition at the Time of Philip the fair. Manuscripts and Printed Books in the Late fifteenth and Early Sixteenth Century Low Countries (2010)

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See detailDynamique spatiale de rejet des déchets au sein des fourmilières Myrmica rubra
Diez, Lise; Lejeune, Philippe ULg; Detrain, Claire

Conference (2010)

La vie en société de milliers d’individus apparentés dans un milieu confiné augmente le risque de transmission des pathogènes. Par le biais de comportements hygiéniques collectifs tels quel le rejet des ... [more ▼]

La vie en société de milliers d’individus apparentés dans un milieu confiné augmente le risque de transmission des pathogènes. Par le biais de comportements hygiéniques collectifs tels quel le rejet des déchets, les insectes sociaux ont développé des défenses spécifiques contre les pathogènes. Nous avons comparé la dynamique de rejet de différents types de déchets (cadavres, proies et morceaux de vermiculite) introduits dans des nids de Myrmica rubra. L’analyse vidéo, réalisée grâce à un programme original de suivi du déchet et de digitalisation des zones de couvain, a permis un suivi précis du déplacement de ces déchets au sein du nid. La vermiculite a été rapidement rejetée après 12 ± 4 minutes, les cadavres ont été éliminés après 139 ± 28 min et les proies ont été consommées puis rejetées après 17,3 ± 0,3 heures. L’analyse spatiale des déchets a montré un déplacement rapide des cadavres loin du couvain alors que les proies étaient fréquemment apportées près des larves pour la consommation. L’efficacité de la gestion des déchets a été testée par ailleurs en comparant la survie de colonies de fourmis ayant ou non la possibilité de rejeter leurs cadavres. La mortalité des adultes et des larves vivant dans des nids contraints de garder leurs cadavres est significativement supérieure à celle observée dans les colonies contrôles, confirmant l’importance de ce rejet pour la survie et le bon état sanitaire de la fourmilière. [less ▲]

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See detailHydrothermal synthesis, crystal chemistry, and stability of fillowite-type phosphates in the Na-Mn-Fe2+-Mg-PO4 system
Rondeux, Mélanie ULg; Hatert, Frédéric ULg

in Acta Mineralogica-Petrographica, Abstract series (2010), 6

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See detailSocial enterprise
Defourny, Jacques ULg

Conference (2010)

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See detailDiagnostic de l’exploration botanique des Caesalpinioideae et Mimosoideae de l’Afrique centrale.
Ndayishimiye, J; Bamba, I; Stoffelen, P et al

in Botanical diversity: exploration, understanding and use, 16-18 September 2010 (2010)

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See detailCassandre, un outil pour construire, confronter et expliciter les interprétations
Lejeune, Christophe ULg

in Beauvais, Martine; Clénet, Jean (Eds.) Actes du 2ème colloque international francophone sur les méthodes qualitatives (2010)

Cassandre est un logiciel libre d'analyse de textes, adossé à la plateforme collaborative Hypertopic. Fruit de la convergence épistémologique entre l'analyse qualitative (en sciences humaines) et le Web ... [more ▼]

Cassandre est un logiciel libre d'analyse de textes, adossé à la plateforme collaborative Hypertopic. Fruit de la convergence épistémologique entre l'analyse qualitative (en sciences humaines) et le Web socio-sémantique (en informatique), cet outil accompagne la construction semi-automatique du (des) cadre(s) d'analyse du (des) chercheur(s). Une série de comptes-rendus d'utilisation (tantôt collectifs tantôt isolés, plutôt inductifs ou hypothético-déductifs) attestent des apports de l'outil : génération d'un journal de bord, économie cognitive et temporelle, flexibilité, aide au travail en équipe et multiplication des entrées dans le matériau. Ces usages témoignent également des inévitables limites afférentes à l'usage d'un logiciel dans une approche qualitative. En définitive, on plaide donc pour un recours raisonné à Cassandre, comme à tout autre logiciel. [less ▲]

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See detailArtificially generating sediment incipient motion in natural conditions
Gob, Frédéric ULg; Houbrechts, Geoffrey ULg; Linares Carreté, Alba et al

Poster (2010)

Incipient motion thresholds for gravel bed rivers are studied in flumes and natural rivers. Flume studies allow variables such as channel slope, water velocity, water depth, sediment size and sediment ... [more ▼]

Incipient motion thresholds for gravel bed rivers are studied in flumes and natural rivers. Flume studies allow variables such as channel slope, water velocity, water depth, sediment size and sediment composition to be controlled. Meanwhile, in the field, the incipient motion of particles is studied in natural conditions allowing the structure of the bed and the flood characteristics to be considered. Though much less developed, an intermediate possibility also exists. By artificially accelerating near bottom velocity of the water flow in a small portion of the bed, it is possible to initiate sediment transport. This allows sediment incipient motion to be observed in natural conditions while controlling the water velocities. The Cemagref (HHLY) has developed a device which confines water flow in a small tunnel on the bottom of the riverbed. It was developed in order to create a boundary layer similar to the one generated by natural flow. Water is injected into a filter which smoothes the flow before it enters a Plexiglas tunnel where sediment motion is observed. The flow is accelerated by two large pumps that allow flow velocities of up to 2.5 m/s in a small area 40 cm long, 20 cm wide and 12 cm high. As the water flow is confined, large scale turbulence similar to that occurring in natural rivers cannot be reproduced using the device. The velocity profile in the tunnel is stable and in equilibrium with the riverbed. Sediment motion was observed using this device on three Belgian gravel bed rivers (3.5 cm <D50<8 cm). The incipient critical velocities measured were coherent in the three rivers sampled, ranging between 1.3 m/s and 1.7 m/s. A progressive increase in velocity in the tunnel permitted size selective entrainment to be observed. Analysis of the particle entrainment schemes and associated velocities allowed the role played by the armoured layer and the Di/D50 ratio to be more fully understood. Critical velocities measured using the device were also compared to critical velocities observed in natural conditions, determined during several pebble tracing campaigns. This revealed that incipient motion velocities of the largest particles recorded in artificial conditions were systematically larger than those observed in natural conditions. This demonstrates the roles played by large scale turbulence and the vertical component of the flow velocity in single particle entrainment. Due to its inherent characteristics, both of these flow components are weak in the artificial conditions generated by the device. In conclusion, our study demonstrates that this type of device is a useful tool in observing and studying incipient motion processes and, in particular, the role played by the bed structure (armouring, protrusion, etc.). However, some improvements are still required in order to more accurately measure critical velocities, allowing critical discharges to be determined. [less ▲]

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See detailUse of multi-angle high-resolution imagery and 3D information for urban land-cover classification: a case study on Istanbul
Binard, Marc ULg; Tack, Frederik; Van de Voorde, Tim et al

in Joint SIG Workshop Urban - 3D - Radar - Thermal Remote Sensing and Developing Countries - Ghent, 22-24 September 2010 Book of Proceedings EUROPEAN ASSOCIATION OF REMOTE SENSING LABORATORIES (2010)

The BELSPO-MAMUD project focuses on the use of remote sensing data for measuring and modelling urban dynamics. Remote sensing is a wonderful tool to produce long time-series of sealed surface maps, which ... [more ▼]

The BELSPO-MAMUD project focuses on the use of remote sensing data for measuring and modelling urban dynamics. Remote sensing is a wonderful tool to produce long time-series of sealed surface maps, which are useful for this purpose. In the urban context of Istanbul, a very dynamic city, recent high resolution satellite images and medium resolution images from the past have been exploited to calibrate and validate a regression-based sub-pixel classification method allowing this production. Image classification in an urban context is a tricky task for several reasons: prominent occurrence of shadowed and occluded areas and urban canyons, spectral confusions between urban and non-urban materials at ground and roof levels, moderately hilly relief ... To cope with these difficulties the combined use of three types of data may be helpful: diachronic (vii), multi-angle and 3D data. A master multispectral and panchromatic QuickBird image and a panchromatic Ikonos stereopair, all acquired in March 2002, were used in combination with a multispectral and panchromatic Ikonos image of May 2005. A DSM was generated from the Ikonos stereopair and building vector file. It was used for orthorectification, building height estimation and classification. The area covered by the high resolution products was divided in 3 parts and each was classified independently. This application demonstrates that a recent high resolution land-cover classification produced using multi-date, multi-angle and DSM can be used to produce sealed surface maps from longer time-series of medium resolution images over large urban areas, thus enabling the analysis of urban dynamics. [less ▲]

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See detailSuggested mechanism of action of classical and deformable liposomes through pig ear skin
Gillet, Aline ULg; Lecomte, Frédéric ULg; Rozet, Eric ULg et al

in Journal of Pharmacy & Pharmacology (2010), 62(6), 788-807

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See detailLimiting the parameter search space for dynamic models with rational kinetics using semi-definite programming
Fey, Dirk; Bullinger, Eric ULg

in Proceeding of the 11th International Symposium on Computer Applications in Biotechnology (2010)

Estimation of kinetic parameters is a key step in modelling, as direct measurements are often expensive, time-consuming or even infeasible. The class of dynamic models in polynomial form is particularly ... [more ▼]

Estimation of kinetic parameters is a key step in modelling, as direct measurements are often expensive, time-consuming or even infeasible. The class of dynamic models in polynomial form is particularly relevant in systems biology and biochemical engineering, as those models naturally arise from modelling biochemical reactions using for instance mass action, Michaelis-Menten or Hill kinetics. Often the parameters are not uniquely identifiable for a given model structure and measurement set. Thus the question of which parameters are consistent or inconsistent with the data arises naturally. Here we present a method capable of proving inconsistency of entire parameter regions with the data. Based on the polynomial representation of the system, we formulate a feasibility problem that can be solved efficiently by semi-definite programming. The feasibility problem allows us to check consistency of entire parameter regions by using upper and lower bounds on the parameters. This drastically limits the search space for subsequent parameter estimation methods. In contrast to similar approaches in the literature, the here presented approach does not require a steady state assumption. Measurements at discrete time points are used, but neither regular sampling intervals, nor a time discretisation of the system is required. Measurement uncertainties are dealt with using upper and lower bounds on the measured states. [less ▲]

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See detailOptimal design of a CO2 absorption unit and assessment of solvent degradation
Léonard, Grégoire ULg

Conference (2010)

Presentation of the main research fields of my PhD thesis at the University of Liège

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See detailPrincipios sobre el mejoramiento genético de las leguminosas alimenticias del género Phaseolus
Baudoin, Jean-Pierre ULg; Blas, Raúl; Huaringa, Amelia et al

in Primer Congreso Peruano de Mejoramiento Genético y Biotecnología Agricola (2010)

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See detailExperimental and computational study of the correlation between oxygen tension, cell viability and proliferation in fibrin hydrogels
Demol, J.; Lambrechts, D.; Geris, Liesbet ULg et al

in Proceedings of the 17th conference of the European Society of Biomechanics (2010)

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See detailDevelopment of a new genetic evaluation model for carcass quality based on crossbred performances of Piétrain boars in the Walloon Region of Belgium
Dufrasne, Marie ULg; Hammami, Hedi ULg; Jaspart, Véronique et al

Conference (2010)

In context of the development of the genetic evaluation system of Piétrain boars for crossbred performances, a genetic evaluation model was developed for the estimation of genetic merit of boars for ... [more ▼]

In context of the development of the genetic evaluation system of Piétrain boars for crossbred performances, a genetic evaluation model was developed for the estimation of genetic merit of boars for backfat thickness (BF) and meat percentage (%meat). The model developed was a random regression model using linear splines on age which knots at 175, 200 and 250 days. Variance components were estimated by restricted maximum likelihood and Gibbs sampling. Estimated heritability from 150 to 300 days increased from 0.56 to 0.75 for BF and from 0.55 to 0.69 for %meat. Genetic correlation between BF and %meat varied between -0.90 and -0.93 from 150 to 300 days. According to the study of residuals, the developed model was considered to fit well the data especially between 175 and 250 days of age. [less ▲]

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See detailEndothelin-1 as a serum biomarker in idiopathic pulmonary fibrosis in dogs
Krafft, Emilie ULg; Heikkilä, H.P.; Jespers, P. et al

in Proceedings of the 20th ECVIM-CA Congress (2010)

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See detailEvaluation des programmes de réadaptation psychiatrique proposés dans les centres de réadaptation fonctionnelle: Etude préliminaire
Limam, Sarra; Bianchi, Julien; Blairy, Sylvie ULg

in Revue Francophone de Clinique Comportementale et Cognitive (2010)

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