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See detailSynthesis and characterization of porous carbon xerogels and ordered mesoporous carbons for anode materials in Li-based batteries
Léonard, Alexandre ULg; Pirard, Jean-Paul ULg; Job, Nathalie ULg

in Fagadar-Cosma, Eugenia (Ed.) Insights into novel solid materials, their recyclability and integration into Li polymer batteries for EVs. Future research directions in this field.:Book of abstracts (2012, July 04)

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See detailTrace minerals deficiency diagnosis in ruminants
Guyot, Hugues ULg

in Klinkon, Martina; Jezek, Jozica; Staric, Joze (Eds.) Proceedings of the 15th Congress of the International Society for Animal Clinical Pathology & 14th Conference of the European Society of Veterinary Clinical Pathology (2012, July 04)

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See detailPIANC - An opportunity for Intenational contacts and Experience Exchanges
Rigo, Philippe ULg

in Hydrailischer Entwurf und Betrieb von Bauwerken (2012, July 04)

The paper introduces PIANC activities and explain how PIANC is an opportunity for international conytacts and experience exchanges

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See detailDecoding spontaneous brain activity from fMRI using Gaussian Processes: tracking brain reactivation
Schrouff, Jessica ULg; Kussé, Caroline ULg; Wehenkel, Louis ULg et al

in 2012 Second International Workshop on Pattern Recognition in NeuroImaging (PRNI 2012): proceedings (2012, July 03)

While Multi-Variate Pattern Analysis techniques based on machine learning have now been regularly applied to neuroimaging data, decoding brain activity is usually performed in highly controlled ... [more ▼]

While Multi-Variate Pattern Analysis techniques based on machine learning have now been regularly applied to neuroimaging data, decoding brain activity is usually performed in highly controlled experimental paradigms. In more realistic conditions, the number, sequence and duration of mental states are unpredictably generated by the individual, resulting in complex and imbalanced fMRI data sets. Moreover, in the case of spontaneous brain activity, the mental states can not be linked to any external or internal stimulation, which makes it a highly difficult condition to decode. This study tests the classification of brain activity, acquired on 14 volunteers using fMRI, during mental imagery, a condition in which the number and duration of mental events were not externally imposed but self-generated. Application of the obtained model on rest sessions allowed classifying spontaneous brain activity linked to the task which, overall, correlated with their behavioural performance to the task. [less ▲]

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See detailMultiscale Quasistatic Homogenization for Laminated Ferromagnetic Cores
Niyonzima, Innocent ULg; Vazquez Sabariego, Ruth ULg; Dular, Patrick ULg et al

in Proceedings of the 7th European Conference on Numerical Methods in Electromagnetism (NUMELEC 2012) (2012, July 03)

In this paper, we investigate the modeling of ferromagnetic multiscale materials. We propose a computational homogenization method based on the heterogeneous multiscale method (HMM) with inclusion of a ... [more ▼]

In this paper, we investigate the modeling of ferromagnetic multiscale materials. We propose a computational homogenization method based on the heterogeneous multiscale method (HMM) with inclusion of a hysteresis model. The HMM involves: 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. At the microscale, a novel energy consistent hystere- sis model is incorporated. As application example, a laminated iron core is considered. [less ▲]

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See detailEvaluation de l'efficacité de blindage de parois hétérogènes par une méthode de Galerkin discontinue en domaine temporel
Kameni, Abelin; Modave, Axel ULg; Boubekeur, Mohamed et al

in Proceedings of the 7th European Conference on Numerical Methods in Electromagnetism (NUMELEC 2012) (2012, July 03)

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See detailSubproblem h-Conform Magnetodynamic Finite Element Formulation for Accurate Model of Multiply Connected Thin Regions
Dang, Quoc Vuong ULg; Dular, Patrick ULg; Vazquez Sabariego, Ruth ULg et al

in Proceedings of the 7th European Conference on Numerical Methods in Electromagnetism (NUMELEC 2012) (2012, July 03)

A subproblem $\vh$-conform eddy current finite element method is proposed for correcting the inaccuracies inherent to thin shell models. Such models replace volume thin regions by surfaces but neglect ... [more ▼]

A subproblem $\vh$-conform eddy current finite element method is proposed for correcting the inaccuracies inherent to thin shell models. Such models replace volume thin regions by surfaces but neglect border effects in the vicinity of their edges and corners. The developed surface-to-volume correction problem is defined as a step of the multiple subproblems applied to a complete problem, consisting of inductors and magnetic or conducting regions, some of these being thin regions. The general case of multiply connected thin regions is considered. [less ▲]

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See detailValidation of the Advanced Calculation Model SAFIR Through DIN EN 1991-1-2 Procedure
Zaharia, Raul; Gernay, Thomas ULg

in Proceedings of the 10th International Conference ASCCS 2012 (2012, July 03)

The validation of advanced calculation models for the fire design is an important issue for computer code developers, designers and authorities. One approach consists in the comparison with experimental ... [more ▼]

The validation of advanced calculation models for the fire design is an important issue for computer code developers, designers and authorities. One approach consists in the comparison with experimental results, which are not always available or are not always useful, due to the lack of details about the input data or the results, or uncertainties about the boundary conditions. This paper presents the validation of the special purpose computer program SAFIR (2005) for structural fire analysis, through DIN EN1991-1-2 procedure (2010), which represents an alternative to the validation through fire tests. [less ▲]

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See detailAssessing the potential of an algorithm based on mean climatic data to predict wheat yield.
Dumont, Benjamin ULg; Leemans, Vincent ULg; Ferrandis Vallterra, Salvador ULg et al

in Proceedings of the 11th International Conference on Precision Agriculture (2012, July)

Real-time non-invasive determination of crop biomass and yield prediction are maybe among the major challenges in agriculture. But unknown future weather remains the key point of accurate yield forecast ... [more ▼]

Real-time non-invasive determination of crop biomass and yield prediction are maybe among the major challenges in agriculture. But unknown future weather remains the key point of accurate yield forecast. This paper presents the results of a preliminary study that aims to supply the unknown future by daily mean climatic data. The results show that under the Belgian weather, this approach is relevant. Furthermore, the developed methodology appears to be a powerful diagnosis tool of the remaining yield potential under ongoing weather. [less ▲]

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See detailRace cycling: biological evolution
LE GOFF, Caroline ULg; Kaux, Jean-François ULg; Goffaux, Sébastien et al

in Meeusen, R; Duchateau, J; Roelands, B (Eds.) et al Book of Abstracts of the 17th annual Congress of the ECSS (2012, July)

Introduction: The metabolic and cardiac impact of a cycling effort on blood biology is not very well described in the literature. We aimed to measure the concentration of different biomarkers (cardiac and ... [more ▼]

Introduction: The metabolic and cardiac impact of a cycling effort on blood biology is not very well described in the literature. We aimed to measure the concentration of different biomarkers (cardiac and metabolic) released during an international cycling race. Materials and methods: Venous blood samples of 15 young men (25.1 ± 6.4 y.o.) were collected just before (T1), just after (T2), 3 hours (T3) after an international cycling race of 179.6 kilometers in Belgium for the determination of cardiac and metabolic biomarkers: red blood cell (RBC), haemoglobin (HgB), creatinin (Cr), highly sensitive troponin T (hsTnT), myoglobin (MYO) and NT-proBNP. All automated assays were performed according to the manufacter’s specifications. For the statistical analysis, an Anova calculated with the Statistica Software version 9.1 was used. Results and discussions: RBC and HgB levels varied significantly between T0 and T3 (respectively p=0.0026, and p=0.002). Cr concentration also varied significantly between all times (T0-T1:p<0.0001, T1-T3:p=0.0326 and T0-T3 p=0.0001). These changes might be related to renal flow depletion during exercice. MYO increased significantly between T0 and T1 (p<0.0001), but quickly decreased between T1 and T3, however the T3 level stay higher than T0 (p=0.014). The stress delivered from the physical activity performed during the race induced a significant variation of hsTnT which increased significantly between T0 and T1 (p<0.0001) and stayed higher 3 hours after the end of the exercise (T0-T3: p<0.0001). The intense exercise delivery by the race induced a significant variation of NT-proBNP, that followed the same kinetic of hsTnT but in smaller proportion. We noticed variations statistically significant between T0 and T1 and between T0 and T3 for NT-proBNP. These increases of cardiac biomarkers were significant but reasonable and could not allow us to talk about cellular necrosis or irreversible injury. Conclusion: Our results show that stress generated by a cycling race could be the cause for the different metabolic variations observed. Troponin T stays without a doubt the most specific marker for stress related to myocardial tissue. Its increase can then be considered as being of interest. [less ▲]

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See detailA method for plant leaf area measurement by using stereo vision
Leemans, Vincent ULg; Dumont, Benjamin ULg; Destain, Marie-France ULg et al

in Proceedings of CIGR-AgEng 2012 International Conference on Agricultural Engineering (2012, July)

This paper presents a method for the measurement of LAI of wheat in situ. By using stereoscopic images a 3D map was computed. One colour image was segmented to identify plant regions and the 3D leaf area ... [more ▼]

This paper presents a method for the measurement of LAI of wheat in situ. By using stereoscopic images a 3D map was computed. One colour image was segmented to identify plant regions and the 3D leaf area was computed on these regions. The result showed that the precision was about the same as for the reference measurements but required a lesser workload. [less ▲]

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See detailPlanning the capital city of a "community of fortune" in the Soviet Far-East: the Hannes Meyer brigade's scheme for the Jewish autonomous oblast of Birobidzhan (1933-1934)
Fisher, Axel ULg

in 15th IPHS Conference “Cities, nations and regions in planning history” (2012, July)

The creation of the first modern-era Jewish state, Birobidzhan, in early 1930s’ Soviet Union, can be considered as a curtain-raiser attempt to propose a socialist solution to the “Jewish Question” which ... [more ▼]

The creation of the first modern-era Jewish state, Birobidzhan, in early 1930s’ Soviet Union, can be considered as a curtain-raiser attempt to propose a socialist solution to the “Jewish Question” which, as a second thought, also had a part in the regime’s propagandistic maneuvers enacted to downsize the rising influence of Zionism in the country. Nevertheless, this experiment aroused a widespread enthusiasm and called for the participation of both Jews and non-Jews to this “small step in the realization of the Leninist policy on nationalities”. Among these stood Hannes Meyer (1889-1954), the Swiss-born Marxist architect and former director of Dessau’s Bauhaus (1928-1930), which – assisted by his “planning brigade” – offered its expertise to the Soviet Institute for Urban Planning (GIPROGOR) from 1930 to 1936 as chief-planner for Siberia and the Far East. Within this context, Meyer’s brigade was entrusted with the preparation of a scheme for the transformation of the small town of Tikhonkaya situated along the Trans-Siberian Railway into the new Capital of Birobidzhan. This scheme, one of Meyer’s last projects in Soviet Union, represents a step in the planer’s line of research focused on the forms and principles of the “socialist city” – the “elastic city” theory – but, unlike his previous schemes, this work also had to face an additional challenge: expressing the new Jewish national identity of the city and its role as the Soviet Jewish people’s Capital city. How did the planner achieve these goals and what place did modern planning models, the “rhetoric of rationality”, Jewish culture, vernacular architectural and urban forms, the local geographical features and landscape hold in the design and figuration process? [less ▲]

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See detailProteomic comparison of high and low responders to eccentric exercise
Hody, Stéphanie ULg; Croisier, Jean-Louis ULg; Leprince, Pierre ULg et al

in Meeusen, R.; Duchateau, J.; Roelands, B. (Eds.) et al Book of Abstracts of the 17th annual Congress of the ECSS (2012, July)

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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 17th ECSS congres (2012, July)

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See detailInfluence of the addition of functionalized MWCNT on mechanical properties on epoxy/carbon fiber and epoxy/carbon-aramid fiber composites
Fernandez, Carolina; Flores, Paulo; Montrieux, Henri-Michel ULg et al

in Proceedings of the 1st Brazilian Conference on Composite Materials (2012, July)

We investigated the effect of the inclusion of carbon nanotubes (CNT) on the mechanical properties and wear behavior of epoxy/carbon and epoxy/carbon-aramid composites in this study. Epoxy/carbon and ... [more ▼]

We investigated the effect of the inclusion of carbon nanotubes (CNT) on the mechanical properties and wear behavior of epoxy/carbon and epoxy/carbon-aramid composites in this study. Epoxy/carbon and epoxy/carbon-aramid composites with 0 wt.% CNT and 0.3 wt.% CNT were manufactured by RTM, amino functionalized multi-walled CNT (MWCNT) were used to modify the matrix. Tensile, compression, two rail shear, Charpy impact tests and Pin On Disc (POD) were performed on the four composites. The EP/CAF composites showed better impact resistance than the ones containing carbon woven. The addition of CNTs improves the shear modulus in 5% for EP/CF composites and 6% for EP/CAF. The results also show that the dynamic friction coefficient is independent of the CNT content, and the specific wear rate shows no improvement with the selected test parameters. [less ▲]

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See detailLow-order local modelling of structural nonlinearities
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the XVIIIth Symposium on Vibrations, shocks and noise (VCB 2012) (2012, July)

The present paper addresses the problem of characterising structural nonlinearities in view of system identification. A low-order local modelling strategy is proposed and encapsulated in a recently ... [more ▼]

The present paper addresses the problem of characterising structural nonlinearities in view of system identification. A low-order local modelling strategy is proposed and encapsulated in a recently-introduced frequency-domain nonlinear subspace method for the estimation of model parameters. The complete methodology is first demonstrated using two academic examples, namely a Duffing oscillator and a five-degree-of-freedom system comprising two nonlinearities. The identification of an experimental beam involving nonlinear geometrical behaviour is finally addressed. [less ▲]

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See detailUNDERSTANDING DRASTIC CHANGES IN ZOOPLANKTON AND MEDUSAE COMMUNITIES OVER THE 2003-2011 PERIOD IN THE MEDITERRANEAN SEA (CORSICA)
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Goffart, Anne ULg

in 2012 ASLO aquatic sciences meeting : Voyages of discovery (2012, July)

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See detailImpact of strenous exercise on the release of cardiac biomarkers
LE GOFF, Caroline ULg; MELON, Pierre ULg; Kaux, Jean-François ULg et al

in Meeusen, R; Duchateau, J; Roelands, B (Eds.) et al Book of Abstracts of the 17th annual Congress of the ECSS (2012, July)

Background: Cardiac troponins (cTn) are considered as the best biomarkers for detection of myocardial cell injury and NT-proBNP as the best for the cardiac insufficiency. In this study, cTnT was measured ... [more ▼]

Background: Cardiac troponins (cTn) are considered as the best biomarkers for detection of myocardial cell injury and NT-proBNP as the best for the cardiac insufficiency. In this study, cTnT was measured by new commercially available high-sensitive methods in subjects undergoing the Maasmarathon. Our aim was to compare cTnT and NT-proBNP levels in sportive subjects before and after a strenuous exercise. Materials and Methods: Twenty eight subjects (26 ♂, 42.5±11yo) underwent a race of 42.195 kilometers between Visé (Belgium) and Maastricht (The Netherlands). We drowned blood samples before (T0), just after (T1) and three hours after the race (T3). For all patients, cTnT concentrations were measured by high sensitive methods (hsTnT, Roche Diagnostics) on heparin plasma. The NT-proBNP was also determined with the kit Roche on heparin plasma. The protocol was approved by the ethics committee of the University of Liège (Belgium). All subjects gave their informed consent. All statistical analyses were performed using Medcalc version 8.1 for Windows. p-value <0.01 was regarded as statistically significant. Results and discussion: A significant difference between hsTnT concentrations at T0 and T1 (p<0.0001) was measured as well as between T0 and T3 (p<0.001) for NT-proBNP, but not between T1 and T3. This observation appeared only after a strenuous exercise but today this type of exercise is not reproduce easier in a laboratory of sport. Moreover, at this moment, nobody knows if these observations would have cardiac consequences at long terms. Conclusions: Measurement of cardiac troponins by high sensitive methods allows detecting significant release of biomarkers from the heart during exercise. The levels of NT-proBNP were found significantly increased but in less extent than TnThs. We think that the TnThs could be an interesting marker in the future to help sport medicine to detect risk of developing a cardiac problem. [less ▲]

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See detailInfluence of type of contraction upon tendinous tissue during training: animal model
Kaux, Jean-François ULg; Drion, Pierre ULg; Croisier, Jean-Louis ULg et al

in Meeusen, R; Duchateau, J; Roelands, B (Eds.) et al Book of Abstracts of the 17th annual Congress of the ECSS (2012, July)

Introduction: The treatment of choice for tendinopathies is eccentric reeducation. Although the clinical results appear favourable, the biomechanical changes to the tissue are not yet clear. Materiel and ... [more ▼]

Introduction: The treatment of choice for tendinopathies is eccentric reeducation. Although the clinical results appear favourable, the biomechanical changes to the tissue are not yet clear. Materiel and methods: This study compared the effects of two methods of training (eccentric (E) training and concentric (C) training) with untrained (U) rats. The animals underwent training over a period of five weeks. The tricipital, patellar and Achilles tendons were subsequently removed to perform a traction test to the point of tendon rupture, and a histological analysis was performed. Results: There was a significant improvement in the rupture force of the patellar and tricipital tendons between the U and E groups. The tricipital tendons in the control group presented a significantly smaller cross-section than the E- and C-trained groups. No significant difference was observed for the constraints between the three groups for all three tendons. However, a tendency towards improvement was observed between the trained and the U groups for the patellar tendon. Histological studies demonstrated the development of a greater number of blood vessels and a larger quantity of collagen in the eccentric group. Discussion and conclusion: The mechanical properties of tendons in rats improve after specific training, especially following eccentric training. [less ▲]

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See detailINFLUENCE OF FATIGUE ON THE STRIDE CHARACTERISTICS DURING AN INTENSE ENDURANCE RUNTEST
Jidovtseff, Boris ULg; Rodriguez de la Cruz, Carlos ULg; Croisier, Jean-Louis ULg et al

in Abstract book of 17th ECSS Congress (2012, July)

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See detailMuscle fatigue experienced during maximal eccentric exercise is predictive of the plasma creatine kinase (CK) response
Hody, Stéphanie ULg; Rogister, Bernard ULg; Leprince, Pierre ULg et al

in Meeusen, R.; Duchateau, J.; Roelands, B. (Eds.) et al Book of Abstracts of the 17th annual Congress of the ECSS (2012, July)

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See detailA new subspace-based approach to identify nonlinear mechanical structures in the frequency domain
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the 16th IFAC Symposium on System Identification (2012, July)

This paper introduces a new frequency-domain subspace-based method for the identification of nonlinear mechanical systems. The technique exploits frequency data and interprets nonlinearities as feedback ... [more ▼]

This paper introduces a new frequency-domain subspace-based method for the identification of nonlinear mechanical systems. The technique exploits frequency data and interprets nonlinearities as feedback forces exciting the underlying linear system. It is demonstrated using two academic examples, a Duffing oscillator and a five degree-of-freedom system comprising two nonlinearities. [less ▲]

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See detailPlatelet-rich plasma (PRP) to treat upper patellar tendinopathies
Kaux, Jean-François ULg; Croisier, Jean-Louis ULg; SIMONI, Paolo ULg et al

in Meeusen, R; Duchateau, J; Roelands, B (Eds.) et al Book of Abstracts of the 17th annual Congress of the ECSS (2012, July)

Introduction: Tendinopathies, especially upper patellar tendinopathy also known as jumper’s knee, often remain rebel to conservative treatments. Several experimental studies have shown the healing ... [more ▼]

Introduction: Tendinopathies, especially upper patellar tendinopathy also known as jumper’s knee, often remain rebel to conservative treatments. Several experimental studies have shown the healing properties of platelet and their growth factors. These factors have the potentiality to improve healing of different tissues: bones, muscles, tendons... Researches have specifically demonstrated the platelets action as mediator and/or enhancer of tissue healing. On the other hand, such treatment has been totally removed of list of doping treatments. The aim of our study was to investigate the effect of 1 injection of PRP in patients suffering from chronic jumper’s knee. Methods: Patients performed imaging (US and MRI) and functional assessments, and a clinical examination using an algometer, before treatment and 6 weeks after PRP treatment. They were also invited to answer to questionnaire relative to pain and functional status. PRP was obtained from autologous blood using an apheresis system (COM.TEC, Fresenius). The injection of 6mL of PRP was realised without local anaesthesia into the proximal insertion of the patellar tendon. A 48h rest-time was recommended after infiltration. Afterwards, a submaximal eccentric reeducation was initiated 1 week after infiltration 3 times a week during 5 weeks. In case of pain, anti-inflammatory drugs were prohibited and patient were encouraged to take class I or II painbrakers. Our protocol was approved by Ethic Committee of University and University Hospital of Liège. Results: Eighteen patients with jumper’s knee were included in our study. Pre-injection tests revealed pain of the upper part of the patellar tendon just below the patella, associated with loss of function. Imaging exams confirmed diagnosis. Six weeks post-injection, the clinical status was improved for the majority of the patients, with a significant decrease of algo-functional scores. The pain reported during functional assessments was decreased (in particular for the eccentric actions), yet no significant improvement of physical performances was observed. We found no significant differences between imaging exams before and 6 weeks after PRP injection. Conclusion: One in situ injection of PRP clinically improved patients with jumper’s knee 6 weeks after treatment. Most patients reported a decrease of pain during day-life and through physical activities. However nor functional performances neither imaging were improved. A followup at 3 months is actually in process to evaluate more long term efficacy of PRP treatment. [less ▲]

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See detailState Reconstruction from a Limited Number of Synchronized Phasor Measurements: Application to Voltage Instability Detection
Glavic, Mevludin; Van Cutsem, Thierry ULg

in Proceedings of the IEEE PES General Meeting (2012, July)

This paper deals with the performance of the wide-area monitoring previously proposed by the authors in [1], [2] for early detection of voltage instability, when a limited number of synchronized phasor ... [more ▼]

This paper deals with the performance of the wide-area monitoring previously proposed by the authors in [1], [2] for early detection of voltage instability, when a limited number of synchronized phasor measurements is available. This sensitivity-based scheme assumed that phasor measurements are sufficient in number and location for a state estimator to determine the voltages at all buses of the region prone to voltage instability. This paper demonstrates that the method still performs well when relying on bus voltages obtained from a state reconstruction procedure exploiting a limited number of synchronized phasor measurements which do not make the region of concern observable. The state reconstruction is formulated as the minimization, under constraints, of a weighted least square objective involving the available phasor measurements together with bus power pseudo-measurements relative to a reference state. The presented results relate to a 52-bus system with phasor measurements obtained from detailed time simulation of a long-term voltage unstable evolution triggered by a large disturbance. [1] M. Glavic, T. Van Cutsem, “Wide-Area Detection of Voltage Instability From Synchronized Phasor Measurements. Part I: Principle,” IEEE Trans. Power Syst., Vol. 24, No. 3, pp. 1408-1416, Aug. 2009 [2] M. Glavic, T. Van Cutsem, “Wide-Area Detection of Voltage Instability From Synchronized Phasor Measurements. Part II: Simulation Results,” IEEE Trans. Power Syst., Vol. 24, No. 3, pp. 1417-1425, Aug. 2009 [less ▲]

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See detailA dynamical model with hysteresis for the homogenization of ferromagnetic laminated cores
Henrotte, F.; Niyonzima, Innocent ULg; Steentjes, S. et al

in Proceedings of the 7th European Conference on Numerical Methods in Electromagnetism (NUMELEC2012) (2012, July)

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See detailExpanding on olfactory communication in a butterfly: cuticular chemicals indicate sex and age in Bicyclus anynana
Heuskin, Stéphanie ULg; Kaltenpoth, M.; Engl, T. et al

in International Society of Chemical Ecology, 28th Annual Meeting. Abstracts (2012, July)

Chemical (olfactory or gustatory) communication is fundamental to most living organisms but widely understudied compared to other channels of communication such as vision and audition, principally in ... [more ▼]

Chemical (olfactory or gustatory) communication is fundamental to most living organisms but widely understudied compared to other channels of communication such as vision and audition, principally in sexual selection . Here we present the first extensive analysis of cuticular chemical diversity in a butterfly, and investigate whether molecules inform potential mating partners about sex and age. Bicyclus anynana was chosen for its well-known potentialities as a lab model in eco-evo-devo studies , . Chemical interactions have been investigated so far in this species with focus on volatile olfactory components: male sexual pheromones composition and their roles in sexual selection , , their change in ratio with male age, inbreeding coefficient, and other factors . Here we aim completing the picture fully and focus on gustatory non-volatile cuticular chemical diversity in this model species. Indeed, as for Drosophila, the courtship of this butterfly is composed of a series of steps that include short-range interactions during which various chemicals may be involved in mate-choice, through olfactory but also gustatory channels of communication (Nieberding et al., data not published). More than hundred cuticular chemicals were identified and quantified by GC-MS analyses on different parts (abdomen, antennae, head, legs and wings) of B. anynana individuals (n=42, 210 GC-MS analyses) of each sex and at different ages (from 1 to 21 days old). The analysis of the chemical distribution was realised by multivariate statistical analyses (perMANOVA). The results led to the conclusion that some cuticular chemicals are indicative for the body parts and can inform about sex and age. [less ▲]

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See detailDerivation of optimal scroll compressor wrap for minimization of leakage losses
Bell, Ian ULg; Groll, Eckhard; Braun, James et al

in International Compressor Engineering Conference at Purdue, July 16-19, 2012 (2012, July)

The scroll wraps of a scroll compressor play a very important role in the compressor’s efficiency due to their impact on leakage and leakage irreversibilities. In this work, a short summary of the scroll ... [more ▼]

The scroll wraps of a scroll compressor play a very important role in the compressor’s efficiency due to their impact on leakage and leakage irreversibilities. In this work, a short summary of the scroll compressor geometry is presented. Using the geometry of the scroll wraps, an optimal scroll wrap geometry is derived for a given set of constraints on compressor displacement, scroll wrap thickness and volume ratio. This optimal scroll wrap geometry can be used as a starting point for further optimization in a detailed compressor model that includes the effects of mechanical losses. [less ▲]

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See detailStudying hot exozodiacal dust with near-infrared interferometry
Absil, Olivier ULg

in Delplancke, F; Rajagopal, J; Malbet, F (Eds.) Optical and Infrared Interferometry III (2012, July)

Since our first detection of a resolved near-infrared emission around the main sequence star Vega, which we identified as the signature of hot dust grains close to the sublimation limit, we have been ... [more ▼]

Since our first detection of a resolved near-infrared emission around the main sequence star Vega, which we identified as the signature of hot dust grains close to the sublimation limit, we have been systematically searching for similar signatures around a magnitude-limited sample of nearby main sequence stars with the FLUOR instrument at the CHARA array. About 40 targets with spectral types ranging from A to K have been observed within the last 6 years, leading to first statistical trends on the occurence of the bright exozodi phenomenon as a function of spectral type. Our target sample is balanced between stars known to harbour cold dust populations from space-based missions (e.g., Spitzer, Herschel) and stars without cold dust, so that the occurence of abundant hot dust can also be correlated with the presence of large reservoirs of cold planetesimals. In this paper, we present preliminary conclusions from the CHARA/FLUOR survey. We also discuss the first results obtained in 2011/2012 with the new PIONIER visiting instrument at the VLTI, which is now used to extend our survey sample to the Southern hemisphere and to fainter targets. A first measurement of the exozodi/star flux ratio as a function of wavelength within the H band is presented, thanks to the low spectral resolution capability of PIONIER. Finally, we also briefly discuss our plans for extending the survey to fainter targets in the Northern hemisphere with an upgraded version of the FLUOR beam combiner. [less ▲]

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See detailPerformance Comparison of Hydronic Secondary Loop Heat Pump and Conventional Air-Source Heat Pump
Bell, Ian ULg; Braun, James

in International Refrigeration and Air Conditioning Conference at Purdue, July 16-19, 2012 (2012, July)

In residential heat pump systems, the motivation for secondary loop systems is to allow for the use of flammable or toxic refrigerants with lower global warming potentials than the currently employed HFC ... [more ▼]

In residential heat pump systems, the motivation for secondary loop systems is to allow for the use of flammable or toxic refrigerants with lower global warming potentials than the currently employed HFC refrigerants. The addition of radiant panels as integral building components (embedded in concrete at construction) is becoming more common. Combining the large surface area of the radiant panel and an efficient primary loop, the hydronic secondary loop heat pump system can greatly outperform the conventional air-to-air heat pump. The improvement in coefficient of performance is as much as 38% over the conventional air-to-air heat pump when the secondary loop hydronic system is employed. Due to the large area of the radiant panel, the condensing temperature of the primary loop for the hydronic secondary loop heat pump can be reduced by as much as 5°C at high ambient temperatures. [less ▲]

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See detailEnergy and comfort performance analysis of monitored thermally activated building systems combined with geothermal heat pumps
Gantiez, Clément ULg; Lemort, Vincent ULg; Hoogmartens, Jan et al

in International High Performance Buildings Conference at Purdue, July 16-19, 2012 (2012, July)

The combination of geothermal heat pumps (GEO HPs) and thermally activated building systems (TABS), that allow both low temperature heating and high temperature cooling, could yield primary energy savings ... [more ▼]

The combination of geothermal heat pumps (GEO HPs) and thermally activated building systems (TABS), that allow both low temperature heating and high temperature cooling, could yield primary energy savings of around 20- 71% in comparison with conventional heating/cooling systems. However, the potential energy savings are rarely reached in practice due to bad integration of the different subsystems and inefficient control. The present paper presents the analysis of two monitoring campaigns by stressing the influence of relevant parameters such as the performance of components (heat pump, ground heat exchangers, TABS, etc.), building characteristics and the implemented control strategies. The buildings have been monitored and analyzed in the frame of the WKSP-project realized by Institute of Building Services and Energy Design (IGS) at Technical University of Braunschweig. The results show good performance of ground coupled heat pump with seasonal COP up to around 5. Moreover, the use of ground heat exchangers to perform free chilling allows seasonal EER up to 20. Furthermore, the control strategies implemented in the different buildings are quite different. It is also shown that this system can lead to a running cost reduction up to 50% compared to conventional systems and that CO2 emissions can be reduced by 40%. [less ▲]

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See detailLife cycle assessment of carbon xerogels
Melon, Raphaëlle ULg; Renzoni, Roberto ULg; Léonard, Alexandre ULg et al

in Fagadar-Cosma, Eugenia (Ed.) Book of abstracts - Advanced Workshop - Insights into novel solid materials, their recyclability and integration into Li polymer batteries for EVs (2012, July)

In the framework of the SOMABAT European project, a life cycle assessment applied to the production of 1 kg of carbon xerogels was carried out by comparing three drying technologies (vacuum, microwave and ... [more ▼]

In the framework of the SOMABAT European project, a life cycle assessment applied to the production of 1 kg of carbon xerogels was carried out by comparing three drying technologies (vacuum, microwave and convective drying). These carbon materials with controlled texture are thought to be used as active material at the anode side of Li-polymer battery. [less ▲]

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See detailResorcinol-formaldehyde carbon xerogels as lithium-ion battery anode materials: influence of porosity on capacity and cycling behaviour
Léonard, Alexandre ULg; Piedboeuf, Marie-Laure ULg; Khomenko, Volodymyr et al

in Fagadar-Cosma, Eugenia (Ed.) Insights into novel solid materials, their recyclability and integration into Li polymer batteries for EVs. Future research directions in this field.:Book of abstracts (2012, July)

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See detailONELAB: Open Numerical Engineering LABoratory
Geuzaine, Christophe ULg; Henrotte, F.; Marchandise, E. et al

in Proceedings of the 7th European Conference on Numerical Methods in Electromagnetism (NUMELEC2012) (2012, July)

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See detailExperimental Investigation on a Reversible Heat Pump for a Passenger Car
Lemort, Vincent ULg; Cuevas, Cristian; Declaye, Sébastien ULg

in Proceedings of the 21st International Compressor Conference, Purdue 2012 (2012, July)

This paper summarizes the first results of a research project dealing with the development of a reversible heat pump for a passenger car. Heat pump systems appear to be a more efficient alternative to ... [more ▼]

This paper summarizes the first results of a research project dealing with the development of a reversible heat pump for a passenger car. Heat pump systems appear to be a more efficient alternative to electrical resistance heaters for the purpose of heating the car indoor environment. Heat pump systems could be easily implemented into cars by allowing the air-conditioning system to run in reverse. In order to check the technical feasibility of a reversible heat pump system, and to point out technical barriers, a prototype was built and tested. Experimental data was also used to calibrate and validate simulation models of components. A heat pump system model was finally built to investigate the operating conditions of the system. The first part of the paper describes the test rig (architecture, components, and measurement devices) and the experimental campaign. Performance of components (compressor, evaporator, condenser and heater core) is evaluated in terms of variation with the operating conditions. The second part of the paper presents the steady-state semi-empirical models of the components. Such lumped models retain and concentrate the main physical phenomena inherent to the components into successive elementary processes (pressure losses, heat transfers, etc.). They require a limited number of parameters that can be identified based on experimental data. The calibration and the validation of the proposed component models are detailed. Finally, an overall simulation model of the reversible heat pump system is proposed and used to evaluate the energy performance of the system as function of the operating conditions. [less ▲]

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See detailExperiment investigations of 2D stationary mixed flows and numerical conparison
Nguyen, Van Nam ULg; Erpicum, Sébastien ULg; Dewals, Benjamin ULg et al

in Proceedings of the 2nd IAHR Europe Congress (2012, June 27)

Experimental investigations have been carried out to observe the mechanisms of stationary mixed flows in a flume combined with a conduit. The tests have been performed for varied discharges, considering ... [more ▼]

Experimental investigations have been carried out to observe the mechanisms of stationary mixed flows in a flume combined with a conduit. The tests have been performed for varied discharges, considering two 4.2m long rectangular channels 0.985m wide and 0.50m deep, linked by a 2m long closed conduit with a 0.20m wide and 0.15m high rectangular cross-section, located at the channels bottom along the right bank. The experimental results have been compared with numerical modeling performed using an original 2D numerical model, dealing with mixed flows using a single set of equations. [less ▲]

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See detailMétamémoire pour des informations épisodiques et sémantiques dans la maladie d’Alzheimer.
Simon, Jessica ULg; Bastin, Christine ULg; Collette, Fabienne ULg et al

in Proceedings of the "XIIème Colloque International sur le Vieillissement Cognitif" (2012, June 25)

Quelques études ont examiné la précision du jugement concernant leur propre mémoire chez des patients présentant une maladie d’Alzheimer (MA) à l’aide de la procédure « Feeling-of-Knowing » (FOK). Dans ... [more ▼]

Quelques études ont examiné la précision du jugement concernant leur propre mémoire chez des patients présentant une maladie d’Alzheimer (MA) à l’aide de la procédure « Feeling-of-Knowing » (FOK). Dans cette procédure, le participant est invité à prédire sa capacité à reconnaître parmi des distracteurs l’item qu’il n’est pas parvenu à rappeler avant de passer à la phase de reconnaissance. Chez les patients en début de MA, la précision du jugement semble préservée lorsque la tâche implique la mémoire sémantique mais apparaît altérée lorsque la tâche implique la mémoire épisodique (Perrotin & Insingrini, 2010). Il existerait donc une dissociation dans la précision du jugement métacognitif chez les patients avec MA débutante entre les domaines épisodique et sémantique. Cependant, cette hypothèse n’a jamais été examinée au sein d’une même tâche. Dans cette étude, nous avons administré une version adaptée du FOK à 23 patients avec MA débutante et 17 sujets de contrôle. Les participants voyaient des visages de personnes dont ils avaient dû étudier le nom auparavant (items épisodiques) et des visages de personnes célèbres (items sémantiques). Pour chaque visage, les participants devaient indiquer la probabilité qu’ils reconnaissent le nom de la personne sur une échelle qualitative à 4 points (« Aucune chance », « Faible chance », « Forte chance », « Je le connais (rappel) ») puis reconnaître le nom parmi 3 distracteurs. La précision des jugements a été évaluée à l’aide du score de Hamann. Une ANOVA a révélé un effet significatif d’interaction entre le groupe et le domaine mnésique (P = .05), la moindre précision du jugement en mémoire épisodique étant exacerbée chez les patients avec MA. Cette étude renforce donc l’hypothèse selon laquelle il existe une dissociation entre les domaines épisodique et sémantique dans la capacité métacognitive des patients avec MA débutante. Perrotin, A. & Insingrini, M. (2010). La métamémoire et sa fonction de monitoring dans le vieillissement normal et dans la maladie d’Alzheimer. Revue de Neurospsychologie Neurosciences cognitives et cliniques, 2(4), 299-309. [less ▲]

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See detailL'énergie de la participation est-elle renouvelable ? La production de scénarios énergétiques et ses malentendus
Claisse, Frédéric ULg; Italiano, Patrick ULg

in Claisse, Frédéric; Laviolette, Catherine; Reuchamps, Min (Eds.) et al La participation en action (2012, June 22)

Financé dans le cadre du programme de recherche fédéral sur le développement durable, le projet SEPIA avait pour but « d’examiner la faisabilité d’une analyse de durabilité intégrée (integrated ... [more ▼]

Financé dans le cadre du programme de recherche fédéral sur le développement durable, le projet SEPIA avait pour but « d’examiner la faisabilité d’une analyse de durabilité intégrée (integrated sustainability assessment, ISA) du système énergétique belge et d’en débattre avec les représentants de groupes sociaux. » SEPIA illustre le « tournant réflexif » pris ces dernières années par l’approche des nouveaux risques technologiques et environnementaux, lesquels mettraient à l’épreuve les découpages scientifiques traditionnels et imposeraient un mode de gestion publique intégrée, prenant en compte différentes disciplines et cadres cognitifs, dans un contexte d’incertitudes multiples, scientifiques et politiques. Dans cette perspective, le défi de la transition énergétique impliquerait de réinventer des processus délibératifs qui fassent davantage appel à la participation et au dialogue entre société civile, société politique et experts scientifiques. Projet à l’architecture complexe et multidimensionnelle, SEPIA associait une approche experte et une dimension participative, avec une cascade de processus de traitement de données. Dans ses aspects participatifs, SEPIA devait aboutir à la construction de scénarios énergétiques, élaborés par un premier panel d’experts et d’acteurs dans le domaine de l’énergie. La méthode prospective adoptée était celle du backcasting : un futur souhaitable est préalablement posé, obligeant à s’interroger sur les mesures et les étapes nécessaires pour y parvenir et relier ce futur au présent. L’exercice consistait, pour les participants à ce panel, à imaginer des scénarios contrastés permettant à la Belgique de se conformer, à l’horizon 2050, à un ensemble contraignant de huit objectifs de développement durable, dont celui de réduire de 80 % les émissions de gaz à effets de serre. Ces scénarios devaient ensuite être modélisés grâce à un logiciel de simulation énergétique selon les seuils et paramètres identifiés par les experts. Un second panel, composé d’acteurs concernés, était alors chargé d’évaluer les scénarios selon une approche normative multi-critères. Enfin, le résultat de cette évaluation devait être encore retraité par un autre logiciel pour le soutien à la décision en groupe, selon une méthodologie basée sur la logique floue. Un tel souci, indissociablement méthodologique et normatif, d’interroger aussi bien des experts que des groupes sociaux concernés par la problématique, ne va pas sans malentendus quant à la nature même de la participation. Ce sont ces malentendus que notre communication se propose d’interroger. La participation avait-elle un objectif précis en termes de résultats ou était-elle une finalité en soi ? L’évaluation des scénarios devait-elle être centrée sur la désirabilité ou sur la probabilité ? Quelles compétences déterminées devait-on mobiliser autour de la table, sachant que la liste de variables à prendre en compte est potentiellement infinie ? Comment les participants, experts ou stakeholders, s’accommodent-ils d’un design de recherche aussi complexe ? La participation au processus est-elle en soi une gratification ou d’autres incitants sont-ils nécessaires pour mobiliser des expertises de haut niveau ? Ces malentendus ne sont pas propres à SEPIA : ils sont au cœur de tout dispositif de recherche dès lors qu’il s’agit d’associer une réflexion méthodologique à un impératif de participation. [less ▲]

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See detailSurface Water Quality Modelling in the Iskar Basin: Methodology and First Results
MAGERMANS, POL ULg; Everbecq, Etienne ULg; Bourouag, Mohamed ULg et al

in Sabotinov, Nikola; Mazdrakov, Methodi; Yilmaz, Isik (Eds.) et al 12th International Multidisciplinary Scientific Geoconference SGEM 2012, Volume III (2012, June 21)

In 2011, the PEGASE Model has been implemented for the first time in Bulgaria, on the Iskar River basin. Thanks to a project funded by Wallonie-Bruxelles International, the first Iskar database has been ... [more ▼]

In 2011, the PEGASE Model has been implemented for the first time in Bulgaria, on the Iskar River basin. Thanks to a project funded by Wallonie-Bruxelles International, the first Iskar database has been constructed in association with the Danube Region Basin Directorate, and the first simulations have been carried out in 2012. The results of the first simulations are very promising. The perspective for future projects being the validation of the Iskar model, performing prospective simulations to assess the program of measures and extending the model to other Bulgarian basins. [less ▲]

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See detailSound for 3D Cinema and the Sense of Presence
André, Cédric ULg; Embrechts, Jean-Jacques ULg; Verly, Jacques ULg et al

in Nees, Michael A.; Walker, Bruce N.; Freeman, Jason (Eds.) Proceedings of the 18th International Conference on Auditory Display (2012, June 18)

While 3D cinema is becoming more and more established, little effort has focused on the general problem of producing a 3D sound scene spatially coherent with the visual content of a stereoscopic-3D (s-3D ... [more ▼]

While 3D cinema is becoming more and more established, little effort has focused on the general problem of producing a 3D sound scene spatially coherent with the visual content of a stereoscopic-3D (s-3D) movie. As 3D cinema aims at providing the spectator with a strong im- pression of being part of the movie (sense of presence), the perceptual relevance of such spatial audiovisual coherence is of significant interest. Previous research has shown that the addition of stereoscopic informa- tion to a movie increases the sense of presence reported by the spectator. In this paper, a coherent spatial sound rendering is added to an s-3D movie and its impact on the reported sense of presence is investigated. A short clip of an existing movie is presented with three different sound- tracks. These soundtracks differ by their spatial rendering quality, from stereo (low spatial coherence) to Wave Field Synthesis (WFS, high spatial coherence). The original stereo version serves as a reference. Results show that the sound condition does not impact on the sense of presence of all participants. However, participants can be classified according to three different levels of presence sensitivity with the sound condition impacting only on the highest level (12 out of 33 participants). Within this group, the spatially coherent soundtrack provides a lower reported sense of presence than the other custom soundtrack. The analysis of the participants’ heart rate variability (HRV) shows that the frequency-domain parameters correlate to the reported presence scores. [less ▲]

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See detailContinuous synthesis of porous carbon xerogel beads.
Eskenazi, David ULg; Kreit, Patrick ULg; Compère, Philippe ULg et al

in Proceedings of the International Carbon Conference 2012 (2012, June 17)

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See detail- Détection automatique des textes épistolaires du corpus néo-égyptien : méthodes exploitant la récurrence de motifs discriminants
Gohy, Stéphanie ULg; Martin Leon, Benjamin ULg

in Purnelle, Gérald; Longrée, Dominique; Dister, Anne (Eds.) Actes des 11es Journées internationales d'Analyse statistique des Données Textuelles (2012, June 15)

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See detailShip Structure Optimization Using CAD/FEM Integration
Amrane, Amirouche ULg; Caprace, Jean-David ULg; Rigo, Philippe ULg

in 11th INTERNATIONAL MARINE DESIGN CONFERENCE (2012, June 11)

In ship structural design, scantling optimization using mathematical algorithms is not yet largely implemented in industry. Optimization with mathematical algorithms can be very helpful to find the best ... [more ▼]

In ship structural design, scantling optimization using mathematical algorithms is not yet largely implemented in industry. Optimization with mathematical algorithms can be very helpful to find the best solution (minimum weight, minimum cost, maximum inertia,…). Typically, finite element analysis (FEA) tools are used in ship structural assessment. But, to build a FEM model from a CAD one is not easy. It needs a big amount of manual work. In the present work, an innovative optimization workflow was developed. The following steps are carried automatically without any manual intervention. First, from the 3D CAD model, an idealized CAD model is created by the idealization module to take into account the FEM needs. Then, the idealized CAD model is transferred to the FEM tool. After that, the FEM model is meshed and loaded. After FEM solving, the results (stress, displacement, volume etc.) are transferred to the optimizer. The optimizer evaluates the values of the objective function and the constraints previously defined and modify the design variables (plate thickness and the stiffener scantling) to create a new structural model. After several iterations, the optimum solution is evaluated. [less ▲]

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See detailA multiaxial concrete model for applications in structural fire engineering
Gernay, Thomas ULg; Millard, Alain

in Fontana, M.; Frangi, A.; Knobloch, M. (Eds.) Proceedings of the 7th International Conference on Structures in Fire (2012, June 07)

Temperature-dependent material models are required in numerical softwares dedicated to the nonlinear analysis of structures in fire. Although structural concrete is widely used in civil engineering ... [more ▼]

Temperature-dependent material models are required in numerical softwares dedicated to the nonlinear analysis of structures in fire. Although structural concrete is widely used in civil engineering, proper modelling of its thermo-mechanical behaviour remains a challenging issue for engineers mainly because of the complexity of the phenomena that result from the microcracking process in this composite material and because of the lack of numerical robustness of the models. This paper presents a new multiaxial concrete model developed for the analysis of concrete structures in fire. The multiaxial model is based on a plastic-damage formulation and incorporates an explicit term for transient creep strain. After implementation in a finite element software for structural fire engineering calculations, numerical simulations have been performed to highlight the ability of the model to capture some of the main phenomena that develop in concrete (permanent strains, degradation of the elastic properties, unilateral effect) as well as the ability to be used for the fire analysis of large-scale structural elements. [less ▲]

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See detailLa campagne présidentielle camerounaise d’octobre 2011 sur internet. Enjeux et défis dans un système électoral "verrouillé"
Beche, Emmanuel ULg

in ZLITNI et LIENARD, Sami et Fabien (Ed.) La communication électronique dans la "société de l'information": Quels usages, quelles pratiques? (2012, June 07)

Cette communication étudie comment l’élection présidentielle camerounaise de 2012 s’est déroulée sur la Toile. Dans ce pays d’Afrique et de « jeune démocratie » (Tandia Mouaffou, 2009), cette élection est ... [more ▼]

Cette communication étudie comment l’élection présidentielle camerounaise de 2012 s’est déroulée sur la Toile. Dans ce pays d’Afrique et de « jeune démocratie » (Tandia Mouaffou, 2009), cette élection est la toute première à intégrer l’usage des NTIC comme outils de communication et de campagne. Cette innovation intervient dans un contexte où depuis l’avènement de la démocratie en 1990, le système électoral est plus ou moins contesté (Boukongou, 2007). Dans ce contexte où 70% de la population vivent avec un faible pouvoir d’achat, le développement des nouveaux médias reste aussi moins important (INS, 2007). Selon l’ANTIC (2010), le taux de pénétration de l’Internet par exemple est de 0,20%. De plus, les disparités entre les zones rurales et urbaines dans l’accès aux nouveaux médias sont encore énormes (ANTIC, 2007). C’est donc un contexte où en dépit de la passion sans cesse grandissante des citoyens et notamment des jeunes pour les NTIC (Béché, 2010), l’indice du développement numérique est jusqu’ici relativement bas, ce qui n’a pas cependant empêché la dernière élection présidentielle à se déporter sur le champ ouvert de l’Internet. Il s’agit donc d’examiner comment les candidats à cette élection ont utilisé les outils Internet (sites web, facebook, youtube, web TV, twitter, wikipédia, sms) ainsi que la place et l’efficacité de cette stratégie dans la campagne électorale. Il s’agira aussi d’analyser l’e-participation des citoyens camerounais dans cette campagne électronique. L’analyse de l’usage c’est-à-dire de ce qui a été effectivement fait avec les nouveaux médias, permettra alors de cerner comment l’e-communication s’est construite dans ce contexte réseauté émergent. D’ailleurs, l’un des aspects de cette e-campagne relève des stratégies employées. Pour le parti au pouvoir, la web-campagne a été un moyen pour occuper davantage tous les espaces possibles de communication. Pour l’opposition, il s’est plutôt agi de construire une certaine visibilité que ne leur ont pas permise les moyens traditionnels de propagande dont la majorité est contrôlée par l’État. Mais du fait des difficultés d’appropriation des nouveaux médias par une partie des candidats et des citoyens, l’innovation envisagée n’a pas suscité une réelle révolution dans le déroulement de l’élection présidentielle. Il ya eu plutôt une simple transposition de la campagne faite avec les moyens traditionnelles (radio, télévision, presse écrite) sur le champ du Net. Ça été en fait un effet de mode plutôt qu’une révolution qui s’arrime à la dynamique globale amorcée lors des élections américaines de 2008 et accentuée par le printemps arabe. C’est d’ailleurs en partie pour cette raison que cette élection n’a pas eu de qualificatif médiatique comme ça été le cas par exemple avec la révolution iranienne (révolution twitter). En dépit de ces considérations cependant, cette innovation constitue un signe de la modernisation de la vie politique camerounaise et une perspective vers une réelle démocratie. [less ▲]

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See detailDevelopment of an interface between CFD and FE software
Tondini, Nicola; Vassart, Olivier; Franssen, Jean-Marc ULg

in Fontana, Mario; Frangi, Andrea; Knobloch, Markus (Eds.) Proceedings of the 7th International Conference on Structures in Fire (2012, June 06)

The paper presents the assumptions and the issues that arise when developing an integrated modelling methodology between a Computational Fluid Dynamics (CFD) software applied to compartment fires and a ... [more ▼]

The paper presents the assumptions and the issues that arise when developing an integrated modelling methodology between a Computational Fluid Dynamics (CFD) software applied to compartment fires and a Finite Element (FE) software applied to structural systems. In particular, a weak coupling approach used to simulate a fire exposed structure by modelling the fire development in the compartment, the heat penetration in the structure and the mechanical response is described. The advantages and the disadvantages of such a technique are highlighted compared to a full coupling that conversely takes into account all mutual interactions. The favourable aspect of computing the thermal response of the structure in the FE model in order to avoid modelling the structure in the CFD model is underlined, namely a sensitive reduction of computational demand. Finally, a practical application is presented. [less ▲]

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See detailConsideration of local instabilities in beam finite elements by means of effective constitutive laws
Franssen, Jean-Marc ULg; Cowez, Baptiste ULg

in Fontana, A; Frangi, A; Knobloch, M (Eds.) Proceedings of the 7th International Conference on Structures in Fire (2012, June 06)

In the fire situation, Bernoulli beam finite elements are the workhorse used in the general calculation model for simulating the behaviour of the structure. Such finite elements treat all sections as ... [more ▼]

In the fire situation, Bernoulli beam finite elements are the workhorse used in the general calculation model for simulating the behaviour of the structure. Such finite elements treat all sections as class 1 (stocky) sections whatever the slenderness of the plates that make the section, allowing the development of a full plastic stress distribution in the section which leads to complete plastic redistribution in the structure. This type of element is thus not adapted for modelling structures that contain slender sections of class 2, 3 or 4. This document presents a new approach to take into account local instabilities using beam finite elements. The new approach is based on an effective constitutive law of steel. The effective law is not symmetrical with respect to tension and compression because, in tension, the stress-strain relationship is not modified whereas, in compression, the stress-strain relationship is modified. [less ▲]

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See detailFire analysis of a new steel bridge
Tonicello, Eric; Desanghere, Sylvain; Vassart, Olivier et al

in Fontana, Mario; Frangi, Andrea; Knobloch, Markus (Eds.) Proceedings of the 7th International Conference on Structures in Fire (2012, June 06)

The new steel bridge “Hans-Wilsdorf” in Geneva is an exceptional steel structure that will drive general traffic through a main transportation axis. As the investment cost of the project is important, a ... [more ▼]

The new steel bridge “Hans-Wilsdorf” in Geneva is an exceptional steel structure that will drive general traffic through a main transportation axis. As the investment cost of the project is important, a structural fire analysis has been performed to study the sensitivity of the structure to a high temperature exposure, such as a truck in fire on the deck. This analysis will allow deciding whether a severe fire could be an unacceptable economical risk for the bridge. [less ▲]

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See detailVers une définition unique des zones périurbaines?: l'apport de l'écologie du paysage pour la segmentation du gradient urbain-rural
Andre, Marie ULg; Mahy, Grégory ULg; Lejeune, Philippe ULg et al

in Guinand, Sandra (Ed.) Journées APERAU 2012. Penser et Produire la Ville au XXIème Siècle. Modernisation écologique, qualité urbaine et justice spatiale. (2012, June 06)

L'avènement de l'agriculture, la sédentarisation de l'homme dans des villages, l'extension de ces derniers au point de devenir des villes de taille sans cesse croissante sont autant de phénomènes ... [more ▼]

L'avènement de l'agriculture, la sédentarisation de l'homme dans des villages, l'extension de ces derniers au point de devenir des villes de taille sans cesse croissante sont autant de phénomènes augmentant l'emprise de l'homme sur les ressources naturelles et participant à la dynamique paysagère (Mazoyer et Roudart, 1997). Le phénomène n'est pas négligeable: aujourd'hui, le nombre de personnes vivant dans ce qu'on désigne sous le terme de "ville" a dépassé celui des personnes vivant en dehors (United Nations, 2007). Il convient donc d'étudier en profondeur les conséquences de ce processus qu'est l'urbanisation et de les quantifier (Alberti, 2008). En particulier, la périurbanisation, caractérisée par une expansion diffuse de la ville dans un milieu mitoyen gardant son caractère rural, est au cœur des préoccupations de part sa position stratégique entre des espaces fortement et nettement moins anthropisés (Hervoët, 2001). Toute étude scientifique doit commencer par la délimitation du système étudié (Grimm et al., 2003). Paradoxalement, une synthèse bibliographique récente démontre qu'il n'existe pas de consensus sur le nombre de zones rencontrées dans ce gradient ni sur les définitions et caractéristiques de chacune de ces zones. L'article conclu qu'en vue d'une identification spatiale des zones à l'aide de la télédétection, il est préférable d'utiliser préférentiellement les caractéristiques morphologiques qu'il convient de traduire sous forme d'indices de structure spatiale permettant l'implémentation pratique des définitions données aux zones (André et al., en préparation). Suite à cette constatation, la présente contribution présente une méthode de segmentation du gradient urbain-rural qui s'appuie sur des éléments et indices paysagers décrivant la composition et la structure paysagères. Ces indices illustrent sous forme quantifiable les caractéristiques morphologiques les plus couramment citées pour décrire les différentes zones situées dans le gradient. [less ▲]

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See detailSpeckle interferometry at 10 µm with CO2 lasers and microbolometers array
Georges, Marc ULg; Vandenrijt, Jean-François ULg; Thizy, Cédric ULg et al

in Kieffer, Jean-Claude (Ed.) Photonics North 2012 (2012, June 06)

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See detailVers une définition unique des zones périurbaines?
Andre, Marie ULg; Bogaert, Jan ULg; Mahy, Grégory ULg et al

in Guinand, Sandra (Ed.) Journées APERAU 2012. Penser et Produire la Ville au XXIème Siècle. Modernisation écologique, qualité urbaine et justice spatiale. (2012, June 06)

A l'heure où les villes ne cessent d'augmenter leur emprise sur les paysages mondiaux, l'étude des espaces qui les ceinturent, couramment appelés "zones périurbaines" et le phénomène de leur extension ... [more ▼]

A l'heure où les villes ne cessent d'augmenter leur emprise sur les paysages mondiaux, l'étude des espaces qui les ceinturent, couramment appelés "zones périurbaines" et le phénomène de leur extension dans les régions rurales sont plus que jamais des sujets d'actualité. Les conséquences et enjeux s'y jouant varient selon les régions du monde mais d'aucuns s'accordent à dire que le phénomène de périurbanisation mène en général à la formation de ghettos sociaux, au renforcement des inégalités sociales, à la dégradation visuelle des paysages, ainsi qu'à des conflits humains dus à la multiplication des acteurs y vivant ou y pratiquant une activité. Plus précisément, dans le domaine de l'écologie, ces zones peuvent être à l'origine d'invasions par des espèces exotiques, comme à l'origine de la perte, de la fragmentation ou du rétrécissement des milieux et paysages ouverts, des grandes étendues d'habitats non fragmentés, d'espaces destinés aux compensations écologiques ou même de lieux récréatifs. Ces derniers processus diminuent la qualité de la biodiversité à ces endroits. Paradoxalement, les notions de "rural", de "périurbain" et d'"urbain" restent assez floues; les scientifiques de différentes disciplines peinant à leur donner une définition et des limites acceptées par tous. Il n'est pas rare également certaines études mentionnent une de ces zones sans la définir, la signification exacte étant sous-entendue. Les problèmes causés par l'absence fréquente de définition des zones étudiées sont les suivants: • L'interprétation et la classification d'images satellites, de laquelle découle un grand nombre d'informations pour les planificateurs du territoire et les scientifiques, nécessite une définition claire de ce qui est considéré comme une zone urbaine, périurbaine ou rurale ainsi que des critères et seuils qui délimitent ces classes d'occupation du sol les unes des autres; • Il n'y a pas de comparaison possible entre études portant sur le même sujet car les localisations et natures des sites peuvent être différents; • Dans le domaine scientifique, il est difficile de déterminer si une précision faible dans un résultat obtenu dans une zone (péri)urbaine est dû à de mauvaises mesures qui peuvent être améliorées ou si c'est la définition de la zone qui pose problème. Dans cette étude, différents termes, définitions et caractéristiques se rapportant aux zones urbaines, périurbaines et rurales ont été examinés et comparés sur base de critères tels que leur type ainsi que leurs forces et faiblesses, dans une optique d'analyse de l'évolution d'un paysage. Les causes aux différences observées, la pertinence et les lacunes des différentes définitions et caractéristiques ont été discutées. Enfin, la contribution potentielle d'indices paysagers a été examinée. [less ▲]

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See detailInvestigating the factors for fermentative biohydrogen improvement: original bioreactors design and hydrogen partial pressure effect
Beckers, Laurent ULg; Hiligsmann, Serge ULg; Hamilton, Christopher ULg et al

in WHEC 2012, Toronto June 3rd - 7th (2012, June 05)

The anaerobic production of hydrogen from biomass offers the potential production of usable biogas from a variety of renewable resources. However, in order to produce hydrogen at high yields and ... [more ▼]

The anaerobic production of hydrogen from biomass offers the potential production of usable biogas from a variety of renewable resources. However, in order to produce hydrogen at high yields and production rates the biotechnological process needs to be further optimized and efficient bioreactors must be designed [1]. At the CWBI, a continuous horizontal rotating cylinder bioreactor has been designed and investigated to produce biohydrogen from glucose by the strain Clostridium butyricum [2] at good yields (1,9molH2•molglucose-1) and production rates (48,6mmolH2•Lmilieu-1.molhexose-1•h-1). This reactor has an internal volume of 2.3L and a small working volume (300ml) (fig.1). It enhances the hydrogen production rates (by about three times more than a completely stirred bioreactor) by partially immobilizing the bacteria on the porous support. Moreover, the rotating cylinder design enables efficient H2 gas transfer from the liquid phase increasing hydrogen yields by about 25% compared to a completely stirred bioreactor [3-4]. Other original bioreactors, such as a trickle bed, have been built with the same aim of lowering the hydrogen partial pressure and led to similar results. Our work shows the importance of a good liquid to gas transfers in the biohydrogen-producing reactors to reach higher performances. [less ▲]

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See detailExperimental analysis of PKW hydraulic performance and geometric parameters optimum
Machiels, Olivier ULg; Erpicum, Sébastien ULg; Pirotton, Michel ULg et al

in Proceedings of International workshop on Piano Key Weir for In-stream Storage and Dam Safety - PKWISD-2012 (2012, June 01)

In the scope of dam rehabilitation to manage floods increase or to increase water storage, the Piano Key Weir is a good solution for concrete dams. The efficiency of Piano Key Weirs is now well ... [more ▼]

In the scope of dam rehabilitation to manage floods increase or to increase water storage, the Piano Key Weir is a good solution for concrete dams. The efficiency of Piano Key Weirs is now well demonstrated through various experimental studies. Even if parametrical studies are currently undertaken, the definition of the optimal shape to give to the structure is still missing due to the lack of knowledge in the influence of the large set of geometrical parameters. This paper presents the results of a combine experimental and numerical study of PKW. On the one hand, the study, led on a large scale model of PKW, aims at defining the main parameters influencing the hydraulic behaviour of the structure. On the other hand, the influence of these main parameters has been studied on several scale models considering variation of the weir height, the keys widths and the overhangs lengths. The results of the experiments enable to define optimal values for a common variation of these parameters. [less ▲]

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See detailDevelopment Factors and Local Impacts of Agritourism: Comparison Between Slovenia and Walloon Region
Schmitz, Serge ULg; PotočnikSlavič, Irma

in Dubois, Charline (Ed.) Agritourism between embeddedness and internationalization (2012, June)

The bilateral research project between the Republic of Slovenia and Wallonie Bruxelles Internationale“Development Factors of Agritourism: Comparison Between Slovenia and Walloon Region” (L´agrotourisme ... [more ▼]

The bilateral research project between the Republic of Slovenia and Wallonie Bruxelles Internationale“Development Factors of Agritourism: Comparison Between Slovenia and Walloon Region” (L´agrotourisme, son fonctionnement et son rôle dans le développement local en Wallonie et Slovénie aujourd´hui et demain; Dejavnikirazvojaturizmanakmetiji: primerjava med Slovenijo in Valonijo; 2010-2012) was focused on agritourism in order to illustrate how sustainable development thinking can be applied when addressing the problems of the rural areas. It aimed as well to rethink agritourism development according to its embeddeness in order to enlighten the question which form of agritourism is suitable to which rural area and vice-versa. At the same time, agritourism is shaping and is being re-shaped by the internationalization of tourism market. [less ▲]

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See detailGPR detection of saturated areas into concrete in the presence of a water gradient
Louis, Arnaud ULg; Van der Wielen, Audrey ULg; Courard, Luc ULg et al

in 2012 14th International Conference on Ground Penetrating Radar (GPR) (2012, June)

In the concrete, saturated areas are most of the time limited by a transition zone, presenting a water gradient. This transition zone can affect the GPR wave’s reflection and decrease the reflection ... [more ▼]

In the concrete, saturated areas are most of the time limited by a transition zone, presenting a water gradient. This transition zone can affect the GPR wave’s reflection and decrease the reflection coefficient by comparison to the coefficient that would be obtained on a sharp interface. To quantify the impact of the water gradient on the reflection coefficient, we performed finite differences simulations. They showed that the reflection coefficient was reduced by 70% if the thickness of the transition zone was larger than 2/5 of the wavelength. Laboratory experiments, using hygrometric sensors for the water content control, confirmed this trend. [less ▲]

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See detailInfluence de la formation des aides-soignants sur l'activité: expérience belge en matière d'intégration d'un nouveau métier dans les soins à domicile
Heyden, Isabelle ULg; Noël, Stéphanie ULg; Beckers, Jacqueline ULg et al

in AMSE AMCE WAER (Ed.) Congrès Mondial de l'AMSE. Recherche en éducation et en formation: Enjeux et défis d'aujourd'hui (2012, June)

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See detailLaser thermoreflectance for semiconductor thin films metrology
Gailly, Patrick ULg; Hastanin, Juriy ULg; Duterte, Charles et al

in Wehrspohn, R. B., Gombert, A (Ed.) Photonics for Solar Energy Systems IV (2012, June)

We present a thermoreflectance-based metrology concept applied to compound semiconductor thin films off-line characterization in the solar cells scribing process. The presented thermoreflectance setup has ... [more ▼]

We present a thermoreflectance-based metrology concept applied to compound semiconductor thin films off-line characterization in the solar cells scribing process. The presented thermoreflectance setup has been used to evaluate the thermal diffusivity of thin CdTe films and to measure eventual changes in the thermal properties of 5 μm CdTe films ablated by nano and picosecond laser pulses. The temperature response of the CdTe thin film to the nanosecond heating pulse has been numerically investigated using the finite-difference time-domain (FDTD) method. The computational and experimental results have been compared. [less ▲]

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See detailReproductive performance in F1 hybrids of two phytophilous cyprinid fish, the silver bream (Blicca bjoerkna) x the rudd (Scardinius erythrophthalmusl
Nzau Matondo, Billy ULg; Ovidio, Michaël ULg; Philippart, Jean-Claude ULg et al

in Program and Abstracts of the XIV European Congress of Ichthyology (2012, June)

Reproductive performance including the spawning behaviour and quality of gametes in cultured F1 hybrids of two phytophilous cyprinid fish species, the silver bream Blicca bioerkno x rudd Scardinius ... [more ▼]

Reproductive performance including the spawning behaviour and quality of gametes in cultured F1 hybrids of two phytophilous cyprinid fish species, the silver bream Blicca bioerkno x rudd Scardinius erythrophtalmus was investigated in this study at their first sexual maturity. The spawning behaviour was studied in terms of egg release, courting and mating acts under reproductive conditions between hybrids or mixed with the silver bream males. Behavioural experiments were conducted in experimental environments simulating natural reproductive conditions of the species using the spawning ground, high temperature, mixing of sex, natural photoperiod and no hormonal injections. The quality of gametes was evaluated by analysing egg production, sperm density, and F2 and backcross offsprings. For the egg production, the gonadosomatic index, absolute fecundity and egg diameters were analysed at spawning. sperm density was estimated by counting spermatozoa in a hemocytometer. F2 and backcross offsprings were produced from eggs of the female hybrid fertilised with the sperm of a corresponding hybrid male and a male silver bream. The results revealed that these hybrids exhibited all the reproductive behaviours of the parental species with an intense courting activity. Each egg-release act was accompanied by mating activity, involving simultaneously and successively all the experimental males, hybrids and silver bream, resulting in fertilised eggs. The quality of female sexual products was close to that found in parental species. However, the male sexual products were found more diluted, and F2 generations produced with a significantly lower hatching rate than backcrosses. This study has proven that these FL hybrids have the capacity to exhibit all the reproductive behaviour as observed in the wild population of parental species. These hybrids are fertile and thus biologically viable. ln rivers, their backcrossed offsprings have a greater chance of occurring than F2 progeny. [less ▲]

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See detailDetection of thin layers into concrete with static and CMP measurements
Van der Wielen, Audrey ULg; Courard, Luc ULg; Nguyen, Frédéric ULg

in 2012 14th International Conference on Ground Penetrating Radar (GPR) (2012, June)

Most concrete bridge decks contain a thin waterproofing layer, whose complex GPR signature can affect the detection of disorders or delaminations into the slab. In this study, we characterized the ... [more ▼]

Most concrete bridge decks contain a thin waterproofing layer, whose complex GPR signature can affect the detection of disorders or delaminations into the slab. In this study, we characterized the detection limits of our 2.3 GHz antenna for the detection of thin layers, with static and CMP measurements. In this last configuration, we showed that the radiation pattern and the reflection coefficient estimation are key parameters to use the inversion of the amplitude versus offset (AVO) curves for the estimation of the layer parameters. The theoretical results were compared to the results of FDTD simulations, performed with GprMax2D, and to laboratory measurements, performed on concrete slabs or sand containing thin layers. [less ▲]

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See detailModélisation hydrodynamique et télémétrie : vers de nouvelles connaissances pour l'écologie des poissons du Rhône
Capra, Hervé; Ovidio, Michaël ULg; McNeil, Eric et al

in IS Rivers Extended Abstract book (2012, June)

The article presented herein aims to demonstrate how a two-dimensional hydrodynamic model representing abiotic conditions can be used to study the behaviour of fish affected by large fluctuations of ... [more ▼]

The article presented herein aims to demonstrate how a two-dimensional hydrodynamic model representing abiotic conditions can be used to study the behaviour of fish affected by large fluctuations of environmental conditions in the Rhône River. This represents a major advancement in the understanding of aquatic community structures and in particular, for the structure of fish communities that are rarely used in France. For the first time, the environmental conditions affecting fish and their spatial localization will be simultaneously known. The model can also simulate habitat conditions and water temperatures over longer time frame. For example, this methodology is compatible with the monitoring of fish communities of the Rhône River, which was initiated in 1979. The interest in modeling precise habitat and temperature conditions with hydrodynamic models for a large array of flows allows one to consider the role that these two key environmental factors play on fish behaviour. [less ▲]

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See detailDes mots pour se dire: Développement de la fonction narrative chez l'enfant.
Boulard, Aurore ULg; Poudat, Céline; Gauthier, Jean-Marie ULg

in Dister, Anne; Longrée, Dominique; Purnelle, Gérald (Eds.) Proceedings of the 11th International Conference on Textual Data Statistical Analysis (2012, June)

The present study is based on a corpus made of spontaneous oral speech: 136 children aged from 3 to 13 have been recorded in three different environments that are favorable to the production of self ... [more ▼]

The present study is based on a corpus made of spontaneous oral speech: 136 children aged from 3 to 13 have been recorded in three different environments that are favorable to the production of self-narratives. Using linguistic annotations and tried and tested text statistics methods, we have been able to show different aspects of the development of narratives and self-narratives in children speeches, including the impact of age and environment on the construction of narratives. The results we obtained are significant, and we hope we succeeded in demonstrating how relevant text statistics methods are when applied to clinical psychology. [less ▲]

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See detailBackground Subtraction: Experiments and Improvements for ViBe
Van Droogenbroeck, Marc ULg; Paquot, Olivier

in Change Detection Workshop (2012, June)

Motion detection plays an important role in most video based applications. One of the many possible ways to detect motion consists in background subtraction. This paper discusses experiments led for a ... [more ▼]

Motion detection plays an important role in most video based applications. One of the many possible ways to detect motion consists in background subtraction. This paper discusses experiments led for a particular background subtraction technique called ViBe. This technique models the background with a set of samples for each pixel and compares new frames, pixel by pixel, to determine if a pixel belongs to the background or to the foreground. In its original version, the scope of ViBe is limited to background modeling. In this paper, we introduce a series of modifications that alter the working of ViBe, like the inhibition of propagation around internal borders or the distinction between the updating and segmentation masks, or process the output, for example by some operations on the connected components. Experimental results obtained for video sequences provided on the workshop site validate the improvements of the proposed modifications. [less ▲]

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See detailCombining Full Transients and Phasor Approximation Models in Power System Time Simulation
Plumier, Frédéric ULg; Fabozzi, Davide ULg; Geuzaine, Christophe ULg et al

in Proceedings of the 21th International Conference on Domain Decomposition Methods (DD21) (2012, June)

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See detailWhat is the position of agritourism on the Walloon tourist market?
Dubois, Charline ULg; Schmitz, Serge ULg

in Potocnik, Irma (Ed.) Agritourism between embeddedness and internationalization (2012, June)

Marginal practices composed by diversified services, agritourism remains a complex subject of study in some European rural areas where it is clamed as a smart solution of diversification. Even if the ... [more ▼]

Marginal practices composed by diversified services, agritourism remains a complex subject of study in some European rural areas where it is clamed as a smart solution of diversification. Even if the phenomenon is quite weak on the Walloon tourist market, it is important from the point of view of farmers for who agritourism is a mean of supplementary incomes. Based on crossed informations and data coming from surveys of potential tourists carried out in tourist poles, life-histories of local tenants and interviews of privileged witnesses as well as content analysis of promotional folders and websites, the position of agritourism on the Walloon tourist market is analysed. It is showed firstly that agritourism is a niche market, which risk dissociating itself from the first pathway if the links between the farm and the tourism continue to weaken. Most of the time agritourism is complementary to other tourist offers but it can also compete with some other forms of tourism in particular cases. Furthermore the demand influences agritourism development through different images and representations that may go off the agricultural practices than with which farmers need to adapt their activities. Finally, different diversifications are developed according to geographic settings. [less ▲]

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See detailAssessment of the ecological status of P. oceanica meadow with a no destructive shoot method
Gobert, Sylvie ULg; Lejeune, Pierre ULg; Chéry, Aurélia et al

in Proceedings of the Mediterranean Seagrass Workshop 2012 (2012, June)

Posidonia oceanica (L.) Delile is a protected species, included in the Red list of marine threatened species of the Mediterranean. Because of its sensitivity to disturbance, P. oceanica is used as a ... [more ▼]

Posidonia oceanica (L.) Delile is a protected species, included in the Red list of marine threatened species of the Mediterranean. Because of its sensitivity to disturbance, P. oceanica is used as a bioindicator to define the health status of coastal waters. Monitoring methods generally require to sample plants, followed by measurements on picked shoots. This implies the total destruction of several tens of shoots. This study presents a method, “The Non Destructive Shoot Methodology”: NDSM, that permits the measurement of (1) the most used seagrass metrics, (2) the determination of C, N, P contents and (3) the measurement of the trace metal levels in P. oceanica leaves. Our technic has been firstly tested by comparison with the results obtained with classic method of biometry. Secondly, differences between levels of C, N, P and trace metals obtained with classic picking and our methodology were tested. Thirdly, the physiological consequences on the shoots were investigated (% of survival, growth, essential element contents (C, N, P, Fe, Cu...). The NDSM gives similar results to classic investigations to assess the ecological status of P. oceanica meadow (i.e. PREI, BiPO...) and avoid the uprooting of the “K-strategist” protected species. This methodology is usable in cases of monitoring and impact studies. [less ▲]

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See detailGender and success in entrepreneurship research: A critical perspective
Chasserio, Stéphanie; Constantinidis, Christina ULg; Lee-Gosselin, Hélène et al

in 12th EURAM Annual Conference Proceedings (2012, June)

This paper aims to challenge the conventional definition of success in entrepreneurship. It pinpoints the inadequacy of its masculine gendered definition to take into account the vision of women ... [more ▼]

This paper aims to challenge the conventional definition of success in entrepreneurship. It pinpoints the inadequacy of its masculine gendered definition to take into account the vision of women entrepreneurs (WEs). It focuses on the concept of success and its various meanings for WEs. The paper is grounded in three qualitative studies on WEs undertaken in Quebec, France and Belgium, reaching 151 diverse entrepreneurs. The findings reveal that the commonly accepted definition and measure of entrepreneurial success, business growth and financial performance, is not adequate for most WE s. Broader visions of success and complex meanings exist among Wes; success is a multi-dimensional reality rather than a simple dominant goal: profits or growth. Our contribution is to challenge the relevance of traditional theoretical frameworks in entrepreneurship, and we plead for their widening, for women and men. We also propose a conceptual grid to reconsider success in entrepreneurship which could be exploited in other research. [less ▲]

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See detailModelling the Position Control of a Segment of the E-ELT using OOFELIE::Multiphysics Integrated FEM-based Approach
Nachtergaele, Philippe; Gamonal Rozas, Leonardo Alfredo ULg; Bruls, Olivier ULg

in Proceedings of the 13th International Conference on New Actuators (2012, June)

This paper presents the extension of a multiphysics software solution allowing to perform integrated simulation of multiphysics controlled systems. This enhancement relies on an innovative formulation of ... [more ▼]

This paper presents the extension of a multiphysics software solution allowing to perform integrated simulation of multiphysics controlled systems. This enhancement relies on an innovative formulation of time integration schemes allowing to take into account simultaneously, in an integrated FEM-based approach, the non linear structural response of a system and the controller dynamics. Interest and feasibility of this unified approach is illustrated through the Modelling of the position control of a segment of the primary mirror of the E-ELT (European Extremely Large Telescope), a highly representative application of complex multiphysics controlled systems. [less ▲]

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See detailCharacterization of an internal type-II NADH dehydrogenase from Chlamydomonas reinhardtii mitochondria
Remacle, Claire ULg

in 15th International Conference on the Cell & Molecular Biology of Chlamydomonas (2012, June)

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See detailMulti-disciplinary research on long-term Middle to Upper Devonian fore-reef successions from Germany and Austria
Pas, Damien ULg; Da Silva, Anne-Christine ULg; Cornet, Pierre et al

in Kido, Erika; Suttner, Thomas; Werer, Piller (Eds.) et al Berichte des Institutes für Erdwissenschaften, Karl-Franzens-Universität Graz (2012, June)

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See detailLes représentations externes en collaboration créative.Etude d’un cas de réunions de conception architecturale
Joachim, Guillaume ULg; Safin, Stéphane ULg; Roosen, Marie ULg

in Guéna, François; Lecourtois, Caroline (Eds.) Complexité(s) des modèles de l'architecture numérique (2012, June)

Le développement d’un projet architectural est accompagné de formes diverses de représentations externes telles que le croquis, les gestes, la maquette tridimensionnelle ou la photographie. La génération ... [more ▼]

Le développement d’un projet architectural est accompagné de formes diverses de représentations externes telles que le croquis, les gestes, la maquette tridimensionnelle ou la photographie. La génération et la manipulation de ces représentations permettent à la fois de résoudre des problèmes de conception architecturale et de soutenir l'exploration de solutions créatives. Cet article a pour objectif, via une exploration théorique et une approche exploratoire du terrain professionnel, de décrire différents enjeux de l’utilisation conjointe de formes différentiées de représentations externes dans les premières phases du processus de projet et particulièrement en réunions de conception. [less ▲]

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See detailImproved Domain Decomposition Method for the Helmholtz Equation
Thierry, Bertrand ULg; Antoine, X.; Boubendir, Y. et al

in Proceedings of the 21th International Conference on Domain Decomposition Methods (DD21) (2012, June)

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See detailEvaluation of the acoustic comfort of air-treatment systems with a multi-task procedure
Minard, Antoine; Robin, Benjamin; Fournier, Francette et al

in E.A.A. (Ed.) Proceedings of the 2012 Euronoise Congress (2012, June)

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See detailA Newmark-type integrator for flexible systems considering nonsmooth unilateral constraints
Chen, Qiongzhong ULg; Acary, Vincent; Virlez, Geoffrey ULg et al

in Proceedings of the First Joint International Conference on Multibody System Dynamics (2012, June)

Mechanical systems are usually subjected not only to bilateral constraints but also to unilateral constraints. Inspired by the HHT time integration method for smooth flexible multibody dynamics, this ... [more ▼]

Mechanical systems are usually subjected not only to bilateral constraints but also to unilateral constraints. Inspired by the HHT time integration method for smooth flexible multibody dynamics, this paper presents a Newmark-type integrator, denoted by nonsmooth HHT method, to include the nonsmooth property of unilateral constraints. Through numerical examples accounting for both rigid and flexible body models, a bunch of methods are compared with the unilateral constraints on both velocity level and position level. Results show that the presented nonsmooth HHT method benefits from the accuracy and stability property of the classical HHT method with controllable numerical damping. In particular, when it comes to the analysis of flexible systems, the nonsmooth HHT method shows much better accuracy property than that of the other methods, including the Moreau–Jean time-stepping method and the fully implicit Newmark methods. [less ▲]

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See detailExperimental and numerical investigation of a meandering jet in shallow rectangular reservoirs under different hydraulic conditions
Camnasio, Erica; Pirotton, Michel ULg; Erpicum, Sébastien ULg et al

in 3rd International Symposium on Shallow Flows (2012, June)

A central meandering jet in shallow rectangular reservoirs has been investigated numerically by the model WOLF2D, on the basis of experimental evidence of this type of flow field in two different setups ... [more ▼]

A central meandering jet in shallow rectangular reservoirs has been investigated numerically by the model WOLF2D, on the basis of experimental evidence of this type of flow field in two different setups at different scales. A sensitivity analysis has been conducted with respect to the main parameters of the model. The oscillation frequency of the transversal velocity and the characteristic Strouhal number have been calculated for different Froude numbers. A logarithmic relationship has been found between the Strouhal and the Froude numbers. [less ▲]

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See detailKeratinocyte-restricted RabGEF-1 expression is a key regulator of skin homeostasis in vivo
Marichal, Thomas ULg; Reber, Laurent; Tam, See Ying et al

in Proceedings of Stanford Pathology Retreat (2012, June)

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See detailAdvanced Engine Dynamics Using MBS and a Mixed Nonlinear FEM and Super Element Approach
Louvigny, Yannick ULg; Duysinx, Pierre ULg

in Eberhard; Ziegler (Eds.) Proceedings of the IMSD2012 - The 2nd Joint International Conference on Multibody System Dynamics (2012, May 31)

Dynamic simulations of a twin-cylinder boxer engine are carried out with rigid and flexible multibody models. Pistons and connecting rods are considered as rigid bodies while the crankshaft is modeled as ... [more ▼]

Dynamic simulations of a twin-cylinder boxer engine are carried out with rigid and flexible multibody models. Pistons and connecting rods are considered as rigid bodies while the crankshaft is modeled as a flexible part and meshed with brick elements. With this model, calculation of crankshaft stresses and displacements is possible. For constant speed studies, flexible simulations are carried out on one or two engine cycles but simulations with a variable rotation speed has to be performed on a larger number of engine revolutions. Due to the complex shape of the crankshaft, the simulation times become important and it is difficult to keep on working with the complete crankshaft model. Thus several simplified models, including super element models, are developed. In this paper, a particular method, using also the super element technique, is proposed. A large part of the crankshaft is substructured and modeled with super elements. While a critical area, identified by a simulation performed with a coarse crankshaft mesh, is not modified and modeled by nonlinear finite element. Several methods of linking the super elements and the finite element mesh are experimented. Once the best connection method determined, results and computation time of the simulation using this model will be compared to those obtained with the complete crankshaft model and the other simplified models. [less ▲]

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See detailTrace element kinetics in contaminated Posidonia oceanica meadow
Richir, Jonathan ULg; Luy, Nicolas; Lepoint, Gilles ULg et al

in Proceedings of the Mediterranean Seagrass Workshop 2012 (2012, May 29)

The seagrass Posidonia oceanica (L.) Delile is widely used since the mid-70th to biomonitor trace elements (TEs). However, there is a lack of knowledge regarding to pollutant kinetics in that species ... [more ▼]

The seagrass Posidonia oceanica (L.) Delile is widely used since the mid-70th to biomonitor trace elements (TEs). However, there is a lack of knowledge regarding to pollutant kinetics in that species. Posidonia oceanica were in situ contaminated by a mix of 15 TEs (Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Mo, Ag, Cd, Pb and Bi) at experimental levels equivalent to 10 (moderate) and 100 (acute) times seawater average concentrations. TEs concentrations were measured by ICP-MS in P. oceanica leaves and rhizomes sampled at regular time intervals, in epiphytes, in water and in sediment. Posidonia oceanica immediately accumulated pollutants from the beginning of experiments; once contaminations ended, TE concentrations came back to their original levels within two weeks, or at least showed a clear decrease. Leaves exhibited different uptake kinetics for many elements (e.g. Cr, Cu, Ag, Bi etc.): the younger growing leaves forming new tissues incorporated chemicals more rapidly than the older senescent leaves. Rhizomes did not show any clear trend, except for Cu, Zn and Bi. Results demonstrate that P. oceanica is a very sensitive sentinel to immediately delineate punctual pollutions similar to what might be measured in contaminated Mediterranean waters. The good response of P. oceanica leaves to pollutant short-term expositions suggests their routine use in regularly scheduled monitoring programs. Nevertheless, to by-pass P. oceanica leaves deciduous character and their capability to detoxify rapidly, long term accumulation recordings would also necessitate belowground tissues analyses. [less ▲]

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See detailL1-based compression of random forest models
Joly, Arnaud ULg; Schnitzler, François ULg; Geurts, Pierre ULg et al

in Proceeding of the 21st Belgian-Dutch Conference on Machine Learning (2012, May 24)

Random forests are effective supervised learning methods applicable to large-scale datasets. However, the space complexity of tree ensembles, in terms of their total number of nodes, is often prohibitive ... [more ▼]

Random forests are effective supervised learning methods applicable to large-scale datasets. However, the space complexity of tree ensembles, in terms of their total number of nodes, is often prohibitive, specially in the context of problems with very high-dimensional input spaces. We propose to study their compressibility by applying a L1-based regularization to the set of indicator functions defined by all their nodes. We show experimentally that preserving or even improving the model accuracy while significantly reducing its space complexity is indeed possible. [less ▲]

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See detailApproximation efficace de mélanges bootstrap d’arbres de Markov pour l’estimation de densité
Schnitzler, François ULg; Ammar, Sourour; Leray, Philippe et al

in Bougrain, Laurent (Ed.) Actes de la 14e Conférence Francophone sur l'Apprentissage Automatique (CAp 2012) (2012, May 23)

Nous considérons des algorithmes pour apprendre des Mélanges bootstrap d'Arbres de Markov pour l'estimation de densité. Pour les problèmes comportant un grand nombre de variables et peu d'observations ... [more ▼]

Nous considérons des algorithmes pour apprendre des Mélanges bootstrap d'Arbres de Markov pour l'estimation de densité. Pour les problèmes comportant un grand nombre de variables et peu d'observations, ces mélanges estiment généralement mieux la densité qu'un seul arbre appris au maximum de vraisemblance, mais sont plus coûteux à apprendre. C'est pourquoi nous étudions ici un algorithme pour apprendre ces modèles de manière approchée, afin d'accélérer l'apprentissage sans sacrifier la précision. Plus spécifiquement, nous récupérons lors du calcul d'un premier arbre de Markov les arcs qui constituent de bons candidats pour la structure, et ne considérons que ceux-ci lors de l'apprentissage des arbres suivants. Nous comparons cet algorithme à l'algorithme original de mélange, à un arbre appris au maximum de vraisemblance, à un arbre régularisé et à une autre méthode approchée. [less ▲]

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See detailEl sindrome tiro-gastrico : screening en 410 pacientes atendidos pro patologia tiroidea
Tome, M; VALDES SOCIN, Hernan Gonzalo ULg; Auriemma, R et al

in Abstract book - 54 Congreso Sociedad Espanola de Endocrinologia y nutrition (2012, May 23)

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See detailCaracteristicas de prolactinomas resisitentes a dosis estandar de cabergolina : un estudio multicentrico en 92 pacientes
Beckers, Albert ULg; Jaffrain-Réa, ML; VROONEN, Laurent ULg et al

in Abstract book - 54 Congreso Sociedad Espanola de Endocrinologia y nutrition (2012, May 23)

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See detailSeguimiento prospectivo ecocardiografico de 104 pacientes con enffermedades endocrinologicas tratados con cabergolina
Daly, Adrian ULg; VROONEN, Laurent ULg; Lancellotti, Patrizio ULg et al

in Abstract book - 54 Congreso Sociedad Espanola de Endocrinologia y nutrition (2012, May 23)

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See detailLa césarienne chez la vache : entre théorie et pratique
Hanzen, Christian ULg

in Proceedings des journées nationales vétérinaires (2012, May 23)

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See detailL’urovagin chez la vache laitière : effets sur les performances de reproduction et traitement chirurgical
Hanzen, Christian ULg; Theron, Léonard ULg

in Proceedings des journées nationales des groupements techniques vétérinaires 2012 (2012, May 23)

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See detailUse of contaminated recycled aggregates for concrete design: properties and durability
Courard, Luc ULg; Michel, Frédéric ULg; Debieb, Farid

in Zajc, Andrej (Ed.) Doseganje posebnih lastnosti betonov z uporabo odpadlih materialov (2012, May 23)

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia ... [more ▼]

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia, Southern Region of Belgium; recycling has clearly to be promoted. Roller Compacted Concrete (RCC) is a special dry concrete made of aggregates, water and low quantity of cement, laid down and compacted like a soil, for the construction of massive structures like dams or large horizontal surfaces like road foundations. Replacement of natural aggregates by concrete road recycled aggregates in the mix design of concrete is a solution to decrease nature depletion. Natural concrete slabs were cured in water, sea water, chloride solutions or sulphate solutions and then crushed to obtain virgin and contaminated (polluted) recycled aggregates. The aim of this research is the total replacement (100% coarse and fine) of natural aggregates (NA) by recycled concrete aggregates (RA) in the composition of a roller compacted concrete. The natural and recycled aggregates are characterised and compared. The mechanical properties and durability performances of concrete with contaminated RA are analysed. The experimental results showed that the polluted RA are much richer in chlorides than in sulphates and are leached if they are soaked in water. Significant differences were observed between the properties of original and new concrete and the results demonstrated the need of taking these contaminations into account. [less ▲]

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See detailAlteration de l'interaction entre le Soi et la mémoire dans la maladie d'Alzheimer
Genon, Sarah ULg; Collette, Fabienne ULg; Salmon, Eric ULg et al

in Maladie d'Alzheimer et déclin cognitif: recherche et pratique clinique (2012, May 22)

Le Soi et la mémoire sont deux systèmes en interaction chez l’homme. Ainsi, une information qui a été traitée en référence à soi fait l’objet de meilleures performances mnésiques qu’une information qui ... [more ▼]

Le Soi et la mémoire sont deux systèmes en interaction chez l’homme. Ainsi, une information qui a été traitée en référence à soi fait l’objet de meilleures performances mnésiques qu’une information qui n’est pas liée au Soi. Ce phénomène cognitif bien connu est appelé « l’effet de référence à soi en mémoire » (« Self Reference Effect », SRE ; 1). En outre, le rappel d’une information qui a été reliée à soi est davantage associé à une expérience recollective (souvenir du contexte d’apprentissage), phénomène appelé le « Self-reference recollection effect » (SRRE ; 2). Dans la maladie d’Alzheimer (MA), l’expérience recollective est sévèrement altérée (3). Si le SRE est principalement sous-tendu par l’expérience recollective, il devrait donc être diminué chez les patients avec MA. Dix-huit patients avec MA à un stade débutant et 21 sujets volontaires de contrôle ont réalisé une première tâche dans laquelle des adjectifs leur étaient présentés. Pour chaque adjectif, ils devaient dans un premier temps soit indiquer si le trait s’appliquait à eux-mêmes (condition soi) soit indiquer si le trait s’appliquait au Roi Albert/à la Reine Fabiola (condition autrui). Dans un second temps, les adjectifs des deux conditions (soi et autrui) étaient mélangés à de nouveaux adjectifs. Pour chaque adjectif, les participants devaient indiquer s’ils avaient vu l’adjectif dans les essais précédents ou non. Quelques jours plus tard, la même procédure était administrée aux participants avec un nouveau set d’adjectifs comparables à ceux de la première tâche, excepté que pour chaque adjectif que les participants indiquaient avoir préalablement vu, ils devaient décrire l’expérience qui avait guidé leur réponse (sentiment de familiarité, expérience recollective ou autre). Concernant la première tâche, l’analyse de la proportion d’adjectifs correctement reconnus révèle que le groupe contrôle présente un SRE alors que cet effet est absent dans le groupe avec MA. Concernant la seconde tâche, l’analyse des proportions de reconnaissances correctes basées (1) sur une expérience recollective et (2) sur un sentiment de familiarité révèle (1) que le groupe contrôle présente un SRRE alors que cet effet est absent dans le groupe MA, (2) que la proportion de réponses correctes basées sur un sentiment de familiarité est similaire entre les deux types d’adjectifs (soi et autrui) et ce dans les deux groupes. Chez les personnes âgées normales, l’information associée au Soi en mémoire est davantage récupérée sur base d’une expérience recollective, menant à de meilleures performances pour ce type d’information que pour une information non reliée au Soi. En revanche, chez les patients avec MA, l’interaction entre le Soi et la mémoire est altérée en ce sens que l’information relative à soi ne bénéficie pas d’une meilleure récupération en raison de la pauvre qualité du processus recollectif. Ces données suggèrent donc que chez les patients avec MA, même à un stade débutant de la maladie, la récupération en mémoire d’information relative à soi est quantitativement et qualitativement altérée. 1) T. Rogers, N. Kuiper, W. Kirker. Journal of Personality and Social Psychology 37, 677 (1977). 2) M. Conway, S. Dewhurst. Applied Cognitive Psychology 9, 1 (1995). 3) G. Della Barba. Memory 5, 657 (1997). [less ▲]

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See detailLow temperature assembly method of microfluidic bio-molecules detection device
Van Loo, Stéphanie ULg; Stoukatch, Serguei ULg; Van Overstraeten-Schlögel, Nancy et al

in Suga, Tadatomo; Takagi, Hideki; Higurashi, Heiji (Eds.) 2012 3rd IEEE International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D 2012) (2012, May 22)

We developed a microfluidic device for the detection of bio-molecules. The active part of the device is a biofunctionalized interdigitated capacitive sensor. The microsystem consists of a sensor on ... [more ▼]

We developed a microfluidic device for the detection of bio-molecules. The active part of the device is a biofunctionalized interdigitated capacitive sensor. The microsystem consists of a sensor on silicon chip, a microfluidic channel formed by photo-patternable resist and a plastic cover. We implemented a low temperature packaging process to assemble the sensor and prevent the biological material from degradation. [less ▲]

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See detailProjet HETICE : encourager et promouvoir une utilisation efficace et réfléchie des TICE dans l'enseignement supérieur
Risack, Zoé ULg; Denis, Brigitte ULg

in Actes du 27e Congrès International de Pédagogie Universitaire : Quelle pédagogie pour demain ? (2012, May 17)

Comme tout citoyen, l’enseignant est concerné par un usage efficace et réfléchi des Technologies de l’Information et de la Communication (TIC). Toutefois, au niveau des professeurs de l’enseignement ... [more ▼]

Comme tout citoyen, l’enseignant est concerné par un usage efficace et réfléchi des Technologies de l’Information et de la Communication (TIC). Toutefois, au niveau des professeurs de l’enseignement supérieur, comme aux autres niveaux, il n’est pas toujours évident de les intégrer à bon escient dans ses pratiques de formation. Plus particulièrement, trois difficultés sont identifiées : l’absence de curriculum de formation des futurs enseignants quant à la maîtrise des TIC, le manque de maîtrise des TIC par les professeurs et une difficulté à gérer le partage des connaissances et des pratiques entre enseignants. Depuis 2000, le projet HETICE (Hautes Écoles et Technologies de l’Information et de la Communication en Éducation) mené par le CRIFA (Centre de Recherche sur l’Instrumentation la Formation et l’Apprentissage) de l’Université de Liège contribue à apporter une réponse appropriée aux problèmes précités. Un des axes de ce projet vise la création et la pérennisation d’un réseau de partage de ressources et de points de vue entre professionnels, voire le développement d’une communauté de pratique. Parmi les activités de ce réseau, citons la diffusion de l’information via différents canaux (site internet, newsletter, blog…), la capitalisation de ressources existantes au sein du réseau, l’organisation de colloques et de réunions plénières… Lors de ce congrès, un bilan des activités menées au cours des dix dernières années sera présenté sous différents angles comme le type d’activités proposées et menées par le réseau (plénières, colloques,…), les actions des enseignants au sein du réseau (participation aux formations, diffusion d’informations…), les éléments favorisant la mise en place d’un tel réseau ainsi que certains écueils rencontrés. Par ailleurs, nous épinglerons les facteurs susceptibles de transférer une telle mise en réseau d’enseignants du supérieur. [less ▲]

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See detailAre performance-related characteristics associated with sports injuries in young soccer players?
Frisch, Anne ULg; Urhausen, Axel; Seil, Romain et al

in 3rd World Conference on Science and Soccer, Ghent, Belgium 14-16 May 2012 (2012, May 15)

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See detailÉduCoP : la communauté de pratique des étudiants en sciences de l'éducation de l'Université de Liège (Belgique)
Bomgart, Marie-Laure ULg; Denis, Brigitte ULg

in Actes du 27e Congrès International de Pédagogie Universitaire : Quelle pédagogie pour demain ? (2012, May 15)

Le concept de communauté de pratique (Community of Practice ou CoP en anglais) occupe une place de plus en plus importante dans le domaine de la formation. Par ailleurs, les outils informatisés sont ... [more ▼]

Le concept de communauté de pratique (Community of Practice ou CoP en anglais) occupe une place de plus en plus importante dans le domaine de la formation. Par ailleurs, les outils informatisés sont souvent employés pour supporter les activités de ces communautés. À ce jour, même si la plupart des étudiants qui entrent à l'université sont familiarisés avec les technologies, il est toutefois moins fréquent qu'ils les utilisent pour partager de manière durable des informations, collaborer, produire et capitaliser des connaissances. Le projet ÉduCoP, initié en 2010 à l'Université de Liège, vise à développer et pérenniser une communauté de pratique constituée d'apprenants en Sciences de l'Éducation. La constitution d'une telle communauté s'élabore progressivement et nécessite la mise en œuvre de différentes actions ainsi qu'un suivi. Il faut notamment assurer la continuité des activités et la relève au fil des années. Nous présentons ici l'analyse des besoins, des enjeux et des motivations des étudiants à s'engager dans le projet ; le choix d'outils technologiques à mettre à leur disposition (la plateforme eGroupWare) et des formations à leur usage ; la mise en place d'activités pour développer l'identité des membres de la CoP et les amener à débattre de thématiques communes, à produire et à partager des ressources. De plus, nous exposons le processus de collecte de données qui permet de mesurer l'évolution de la communauté. Si les actions entreprises offrent des résultats très encourageants, des freins à la création et à l'évolution d'une telle CoP ont néanmoins été identifiés (ex. manque de culture technologique des membres, réticence à partager les productions personnelles). Par conséquent, une des missions prioritaires du projet ÉduCoP visent à pallier ces manques. À terme, notre objectif est de proposer un guide de recommandations à d'autres facultés et universités qui souhaiteraient entreprendre la mise en réseau et la création de communautés de pratique d'apprenants. [less ▲]

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See detailObjects or intentional objects? Twardowski and Husserl on inexistent entities
Gyemant, Maria ULg

in Seron, Denis; Leclercq, Bruno; Richard, Sébastien (Eds.) Objects and pseudo-objects (2012, May 15)

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See detailLa recette du blanc manger : des variations à la dégustation.
Colson, Maryse ULg

in Renders, Pascale; Steffens, Marie (Eds.) Actes de la quatrième Journée liégeoise de Traitement des Sources galloromanes (TraSoGal): "Du 12e au 21e siècle en Galloromania. Instantané de recherches linguistiques en cours" (Liège, 14 mai 2012) (2012, May 14)

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See detailAccumulation de particules de microplastiques dans le neuston en Méditerranée Occidentale et au large de la Corse
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Collard, France ULg et al

in Séminaire sur le milieu marin : 14 au 16 mai 2012 STARESO Corse (2012, May 13)

Des mesures réalisées lors de diverses campagnes océanographiques ont montré la présence de microparticules de plastiques de diverses natures à la surface des mers avec de hauts niveaux de concentration ... [more ▼]

Des mesures réalisées lors de diverses campagnes océanographiques ont montré la présence de microparticules de plastiques de diverses natures à la surface des mers avec de hauts niveaux de concentration et une large dispersion géographique. La taille de ces microplastiques est inférieure à 5 mm et voisine de celle du mésozooplancton. Ces microplastiques s’accumulent dans la couche de surface de la mer qui constitue l’habitat neustonique et qui héberge des assemblages zooplanctoniques particulièrement adaptés à ces conditions extrèmes. Cet habitat est essentiel pour la ponte et la survie des œufs de nombreux poissons et pour le recrutement des juvéniles. Une étude récente que nous avons réalisée au niveau du bassin Nord Occidental Méditerranéen et au large de la Corse (Campagne MED) a montré des concentrations de 0.116 particules/m2 et un rapport moyen de la masse de microplastique à celle du mésozooplancton de 0.5. Ceci nous suggère la potentialité d’une confusion entre les proies et les microplastiques pour les organsismes se nourrissant de zooplancton (Collignon et al., 2012). Une étude de la variabilité de ces microplastiques dans le neuston et l’impact sur celui-ci est actuellement en cours en Baie de Calvi à STARESO. Références : Collignon, A., Hecq, J.-H., Galgani, F., Voisin, P., Collard, F., Goffart, A., 2012. Neustonic microplastic and zooplankton in the North Western Mediterranean Sea. Mar. Pollut. Bull. (In Press). http://dx.doi.org/10.1016/j.marpolbul.2012.01.011 [less ▲]

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See detailSpatial and/or visual short-term memory deficit in unilateral neglect
Wansard, Murielle ULg; Meulemans, Thierry ULg; Bartolomeo, Paolo

in 1st Joint Meeting of the Belgian Association for Psychological Science and Sociedad Espanola de Psicologia Experimental. (2012, May 11)

Patients suffering from left unilateral neglect fail to perceive or respond to stimuli presented within the contralesional space. Neglect is generally considered as involving an attentional bias towards ... [more ▼]

Patients suffering from left unilateral neglect fail to perceive or respond to stimuli presented within the contralesional space. Neglect is generally considered as involving an attentional bias towards the ipsilateral side. Recently, it has been suggested that revisiting and perseveration behaviors in visual search tasks shown in parietal neglect could be related to impairment in visuo-spatial working memory (Husain et al., 2001; Wojciulik et al., 2001). The aim of the present study was to investigate which aspect of visuo-spatial working memory is involved in unilateral neglect. Indeed, different source of evidence support the idea that visuo-spatial working memory involves at least two separate cognitive subsystems: the visual cache and the inner scribe (Logie, 1995; Pickering et al., 2001). We assessed thirteen right-damaged patients suffering from left neglect on two experimental task involving either spatial (Corsi test) or visual (Span test) working memory. Results show that visual and/or spatial working memory can be impaired in spatial neglect. This double dissociation provides neuropsychological support for the separation of visuo-spatial working memory into two subcomponents. The clinical and anatomical implications of this finding are discussed. [less ▲]

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See detailProcedural learning in Developmental Coordination Disorder
Lejeune, Caroline ULg; Catale, Corinne ULg; Schmitz, Xavier ULg et al

in Books of Abstract: 1st Joint Meeting of the Belgian Association for Psychological Science & Sociedad Espanola de Psicologica Experimental (2012, May 11)

Developmental Coordination Disorder (DCD) is a developmental disorder characterized by marked impairments in motor skills. Despite its negative impact on daily activities and on cognitive and academic ... [more ▼]

Developmental Coordination Disorder (DCD) is a developmental disorder characterized by marked impairments in motor skills. Despite its negative impact on daily activities and on cognitive and academic performance, the mechanisms underlying DCD remain largely unknown. The aim of our study was to investigate the hypothesis of a motor procedural learning impairment in DCD, which would explain difficulties in motor learning and automation of novel motor skills in these children. A total of 32 children (16 with DCD and 16 typically developing [TD] children) aged between 6 and 12 years old participated in this study. Children were administered a task adapted from the traditional shapes’ mirror-tracing task. Results showed that DCD children were able to learn the skill as fast as TD children; the learning pattern of DCD and TD children in motor procedural learning is similar. But is there any generalization of a new perceptual-motor skill in DCD children? Actually, DCD children were slower during the transfer task (triangle task) than TD children; the transfer task was more difficult for the DCD children than their peers. DCD children and TD children differ in their abilities to generalize the motor schema to a new task, more complex. These results confirm the hypothesis of a motor procedural learning impairment in DCD. [less ▲]

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See detailDoes fluid intelligence protect from age-related decline in cognitive control ?
Manard, Marine ULg; Carabin, Delphine; Collette, Fabienne ULg

in Proceedings of the BAPS - SEPEX meeting (2012, May 11)

Age-related difficulties have been reported on proactive control whereas reactive control seems to remain intact. This study investigated the potential influence of fluid intelligence capacity on the age ... [more ▼]

Age-related difficulties have been reported on proactive control whereas reactive control seems to remain intact. This study investigated the potential influence of fluid intelligence capacity on the age-related decline in proactive control. We used a working memory recognition paradigm involving proactive or reactive cognitive control by manipulating the interference level across items. 80 young adults (18-29 years old) and 80 healthy older adults (60-89 years old) were included. The main results revealed significant effects of age and fluid intelligence capacity on sensitivity to interference. As expected, reactive control performance remained intact with aging (similar interference effect in the two groups). In contrast, we observed a larger interference effect in the proactive condition in aging. Finally, older participants with similar level of fluid intelligence to young adults showed no proactive control age-related decrement. Beyond the fact that this study confirms the selective age-related decline in proactive control, it also indicates that the level of fluid intelligence influences the efficiency of proactive control in aging. [less ▲]

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See detailSelf-appraisal and medial prefrontal activation in early stage Alzheimer’s disease
Genon, Sarah ULg; Collette, Fabienne ULg; Angel, Lucie et al

in Proceedings of the 1st Joint Meeting of the Belgian Association for Psychological Sciences (BAPS, Belgium) and Sociedad Espanola de Psicologia Experimental (SEPEX, Spain) (2012, May 10)

Introduction Self-referential processing in healthy subjects is related to activation within cortical midline structures, such as the medial prefrontal cortex (MPFC) and the posterior cingulate cortex ... [more ▼]

Introduction Self-referential processing in healthy subjects is related to activation within cortical midline structures, such as the medial prefrontal cortex (MPFC) and the posterior cingulate cortex (Northoff et al., 2006). The structures are known to be altered in Alzheimer’s disease (AD; Buckner et al., 2008). However, little is known about their engagement during self-referential processing in AD patients. Methods Twenty-two mild AD patients and 22 healthy controls (HC) were administered a self-appraisal task in an fMRI experimentation. The participants saw adjectives and had to indicate if the trait describes them (Self-condition; SC) or the King Albert II/the Queen Fabiola (Other-condition; OC). We examined differences between groups (HC>AD and AD>HC) and a conjunction analysis examined brain activations that were common to both groups during the self-appraisal process (p<.001 uncorrected with a-priori hypotheses). Results No region was found to be significantly more activated during self-appraisal in HC than in AD and vice versa. The VMPFC was the only region commonly activated in AD and HC during self-appraisal process (Punc<.001). Conclusions The study demonstrates that AD patients at early stages of the disease may still engage the MPFC during self-referential processing (compared to a well-known but not close “other”) as HC do. References: Northoff, G., Heinzel, A., de Greck, M., Bermpohl, F., Dobrowolny, H. & Pankseepp, J. (2006). Self-referential processing in our brain-A meta-analysis of imaging studies on the self. NeuroImage, 31, 440-457. Buckner, R.L., Andrews-Hanna, J.R., Schacter, D.L. (2008). The brain’s default network: anatomy, function and relevance to disease. Annals of the New York Academy of Sciences 1124, 1-38. [less ▲]

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in Proceedings Giga Day 2012 (2012, May 04)

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