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See detailUsing phenomenology and mindset induction to assess the prospective function of mind-wandering
Stawarczyk, David ULg; Majerus, Steve ULg; D'Argembeau, Arnaud ULg

Poster (2010, May 28)

A notable feature of the human cognitive apparatus resides in its propensity to spontaneously generate thoughts uncoupled from the “here and now”. An important function of these cognitions, often referred ... [more ▼]

A notable feature of the human cognitive apparatus resides in its propensity to spontaneously generate thoughts uncoupled from the “here and now”. An important function of these cognitions, often referred to as mind-wandering, might be to create and/or update scripts, schemata, and future plans in long-term memory. In this study, we investigated this hypothesis by examining whether priming personal projects influenced the occurrence and characteristics of mind-wandering episodes during a subsequent, unrelated cognitive task, as assessed with an experience sampling method. We found that inducing particular mindsets that were related to personal goals (i.e., writing an essay about one’s personal projects) in comparison to a control baseline condition (i.e., writing an essay about a familiar itinerary) increased the number of future-oriented mind-wandering reports while participants performed the Sustained Attention to Response Task (SART). Furthermore, participants judged most of these thoughts as having a future-oriented function (i.e., they were related to planning, decision making, or reevaluating situations). Finally, as behavioral validation of participants’ subjective reports, we found that mind-wandering was positively linked with intra-individual variability (IIV) in response times, whereas reports of being concentrated on the SART were negatively linked with IIV. These data support the view that an important function of mind-wandering resides in the anticipation and planning of the future. [less ▲]

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See detailThe links between dyslexia and inhibition deficits: do dyslexic children with an inhibition deficit have a specific reading profile?
Verhaegen, Clémence ULg; Schelstraete, Marie-Anne; Noël, Marie-Pascale

Poster (2010, May 28)

The present study focused on the nature of the reading disability of children with both dyslexia and inhibition deficit. Van der Schoot et al. (2000; 2004); Nossent et al. (2005); Nossent and Deroux (2006 ... [more ▼]

The present study focused on the nature of the reading disability of children with both dyslexia and inhibition deficit. Van der Schoot et al. (2000; 2004); Nossent et al. (2005); Nossent and Deroux (2006) showed that these children tended more to guess the words they read because these “guessers” found difficulties in suppressing false candidate words that are activated in the lexicon. To test this account, dyslexic children with and without inhibition deficit were presented a sentence reading task. To evoke guessing, each sentence contained a word or a pseudoword which closely resembled either a valid congruent or incongruent word. Our hypothesis was that dyslexic children with inhibition deficit guessed more the word they read from the sentence context and the global word form than dyslexic children without inhibition deficit. The results showed that both dyslexics with and without inhibition deficit tended more to guess the words than control children without dyslexia and inhibition difficulties. We discussed these results with the fact that most of children with reading difficulties use the sentence context to compensate for poor reading skills. [less ▲]

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See detailPerson recognition: Effects of face and voice learning on access to semantic information from names.
Barsics, Catherine ULg; Marloye, Zoé

Conference (2010, May 28)

Several studies showed that it is more difficult to retrieve semantic information from recognized voices than from recognized faces. However, earlier studies that investigated the recall of biographical ... [more ▼]

Several studies showed that it is more difficult to retrieve semantic information from recognized voices than from recognized faces. However, earlier studies that investigated the recall of biographical information following person recognition used stimuli that were pre-experimentally familiar to the participants, such as famous people’s voices and faces. The present study was designed in order to allow a stricter control of frequency exposure with both types of stimuli (voices and faces). In the present study, subjects had to associate lexical (i.e., name) and semantic information (i.e., occupation) with faces or voices. When asked later to recall semantic information being cued by the person’s names, participants provided significantly more occupations for the targets that had been previously associated with faces than with voices. These results and their implications for current Interactive Activation and Competition person recognition models are discussed. Finally, the potential role of the relative distinctiveness of voices and faces is also considered. [less ▲]

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See detailConsciousness of memory functioning in Alzheimer’s disease
Jaspar, Mathieu ULg; Feyers, Dorothée ULg; Bastin, Christine ULg et al

Poster (2010, May 28)

Metamemory is a multi-faceted concept which deals with the individual’s knowledge and control of memory functioning. Previous studies that have examined the ability of Alzheimer’s disease (AD) patients to ... [more ▼]

Metamemory is a multi-faceted concept which deals with the individual’s knowledge and control of memory functioning. Previous studies that have examined the ability of Alzheimer’s disease (AD) patients to monitor efficiently their memory processes provided contradictory results. These discrepancies between studies could be the result of two factors: the kind of memory task used (episodic, semantic) and the kind of memory process on which memory monitoring is assessed (encoding, maintenance, retrieval). In the present study, different aspects of memory monitoring in 21 AD patients and 21 healthy elderly participants were explored with two tasks : a semantic memory task assessing the feeling-of-knowing (FOK) accuracy for general knowledge and an episodic memory task assessing judgment-of-learning (JOL) and FOK accuracy for information associated to a specific spatiotemporal encoding context By comparison to healthy participants, AD patients exhibit impaired performance on episodic FOK accuracy but not on semantic FOK accuracy. Moreover, no difference was observed between the two groups on the JOL post-encoding accuracy. These results confirm that not all aspects of memory monitoring are impaired in AD. Indeed, although there exists an impairment of episodic FOK performance, semantic FOK and JOL post-encoding appear preserved. The dissociation between the two FOK performance could be due to recruitment of more automatic processes for metacognitive judgment on general knowledge (semantic FOK) than for metacognitive judgment based on specific recent experience (episodic FOK). Similarly, a global prediction during maintenance (JOL) could be based on more automatic processes than an item-by-item judgment during retrieval. [less ▲]

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See detailFeeling of doing in compulsive checking
Belayachi, Sanaa ULg; Van der Linden, Martial ULg

Poster (2010, May 28)

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See detailVisual memory is conceptual and visual search is perceptual: how meaning and expertise may confirm this hypothesis?
Blavier, Adelaïde ULg; Nyssen, Anne-Sophie ULg

Conference (2010, May 28)

The purpose of this study was to evaluate how stimulus meaning and subject’s expertise differentially influence visual memory and visual search. In order to answer this question, 20 novices and 20 experts ... [more ▼]

The purpose of this study was to evaluate how stimulus meaning and subject’s expertise differentially influence visual memory and visual search. In order to answer this question, 20 novices and 20 experts (art historians) performed both long term visual memory (LTVM) and visual search tasks with abstract and non-abstract stimuli (paintings). In the LTVM task, subjects were presented 100 abstract and 100 non-abstract paintings and after each stimuli set presentation, they performed a 3-forced-choice recognition test. In the visual search task, subjects had to find targets as quickly as possible in abstract or non-abstract paintings. Our data showed experts performed better than novices in LTVM task for both abstract and non-abstract stimuli, whereas novices and experts had a similar performance in the visual search task. This result suggests expertise and thus previous knowledge about the stimulus increase memory performance but not visual search performance. Concerning the type of stimulus, performance in LTVM with non-abstract paintings was better than with abstract paintings while the contrary was observed in the visual search task. Stimulus meaning is thus a significant factor for visual memory (as also shown by Chatterjee et al., JOV, 2008) but not for visual search. In conclusion, our findings suggest stimulus meaning and subject’s expertise influence VLTM but not visual search. These results confirm that VLTM is rather conceptual and influenced by top-down processes (like meaning and expertise) while visual search is rather perceptive and influenced by bottom-up processes (as suggested by Konkle, JEP, in press). [less ▲]

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See detailIndéterminations de la photographie (II)
Havelange, Carl ULg

Conference (2010, May 28)

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See detailWhat is the impact of the sequence structure on implicit learning in children?
Lejeune, Caroline ULg; Schmitz, Xavier ULg; Lempereur, Stéphanie et al

Poster (2010, May 28)

It is generally admitted that implicit learning abilities are efficient early in childhood. However, few studies have explored the impact of the structure of the sequence on children’s performance in ... [more ▼]

It is generally admitted that implicit learning abilities are efficient early in childhood. However, few studies have explored the impact of the structure of the sequence on children’s performance in implicit learning tasks. The current research was intended to examine sequence learning abilities in children by comparing sequences of different structural characteristics. [less ▲]

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See detailIs Anosognosia in Alzheimer disease also observed for behavioural and personality changes?
Feyers, Dorothée ULg; Bastin, Christine ULg; Jaspar, Mathieu ULg et al

Poster (2010, May 28)

Anosognosia is a frequent manifestation in Alzheimer disease (AD) but its extent is not yet clearly established. While anosognosia for memory deficit has been widely reported, no study has simultaneously ... [more ▼]

Anosognosia is a frequent manifestation in Alzheimer disease (AD) but its extent is not yet clearly established. While anosognosia for memory deficit has been widely reported, no study has simultaneously explored anosognosia for personality and behaviour changes. We have tackled this question with 20 AD patients and 20 matched elderly subjects (ES). Participants (AD and ES) assessed their personality and their reactions in social situation both in current (S1) and past (S1_bef) time period. Assessment of these characteristics was also performed by relatives of the participants (R2 and R2_bef). Mann-Whitney test (p<0.05) were performed between discrepancy scores (calculated by comparing answers of subjects and relatives) obtained for AD and ES. A specific measure of anosognosia was also calculated by comparing S1 and R2. Statistical analyses demonstrated (1) that relatives of AD patients report more personality and behavioural changes across time (S1-S1_bef) than relatives of ES (R2–R2_bef); (2) that self-reported changes were not significantly different between AD patients and ES; (3) that anosognosia (S1-R2) was observed in AD patients for personality changes only. Results obtained support the hypothesis that anosognosia does not affect all domain in AD. Indeed, even if AD patients are no more able to assess their current personality, they perceive adequately their current reactions in social situations. [less ▲]

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See detailImprovement of Physicians’ Patient-Centeredness: An Empirical Evidence of the Benefits of a Communication Skills Training Program
Jonius, Bénédicte ULg

Poster (2010, May 27)

Objectives. No study has yet assessed the benefits of a communication skills training program on patient-centeredness. The purpose of this study is to assess the association between ... [more ▼]

Objectives. No study has yet assessed the benefits of a communication skills training program on patient-centeredness. The purpose of this study is to assess the association between patients’characteristics and physicians’ communication skills before and after a communication skills training program. Methods. Correlations between physicians’ communication skills and patients’ characteristics were categorized as absent or present: the number of present correlations indicates the level of patientcenteredness. Communication skills were assessed during a consultation before and after a communication skills training program. Consultations were audio-recorded and transcripted. Communication skills were rated according to the Cancer Research Campaign Workshop Evaluation Manual. Patients’ characteristics (sociodemographic, physical and psychological) were measured before and after the training program. Results. Sixty-three physicians were included. Before training, physicians’ communication skills were associated with one patients’ sociodemographic characteristic and with one psychological characteristic. After training, physicians’ communication skills were associated with none of the patients’ sociodemographic characteristics and with four psychological characteristics. Conclusions. This study highlights that physicians’ patient-centeredness may be improved through a communication skills training program. After training, physicians are more centered on patients’ psychological characteristics and not on patients’ sociodemographic characteristics anymore. This study underlines the need to design communication skills training which may further improve patient-centeredness. [less ▲]

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See detailLa césarienne dans l’espèce bovine. Résultats d’une enquête internationale relative aux indications, modalités techniques et thérapeutiques de réalisation et conséquences.
Hanzen, Christian ULg; Gauthier, Bernard; Paindavenne, Pierre et al

in Comptes-rendus des journées nationales des groupements techniques vétérinaires (2010, May 27)

Le texte présente les résultats d’une enquête sur les indications les circonstances et techniques opératoires de la césarienne chez la vache.508 vétérinaires de différents pays ont répondu au ... [more ▼]

Le texte présente les résultats d’une enquête sur les indications les circonstances et techniques opératoires de la césarienne chez la vache.508 vétérinaires de différents pays ont répondu au questionnaire proposé (www.upv/cesarienne/. Dans la majorité des cas, la césarienne est pratiquée en race charolaise(32.3%) ou Blanc Bleu Belge (29.9%) pour cause de disproportion foeto pelvienne(64.6% des cas) sans tranquilisation générale( (80%) , sous anesthésie locale ou loco régionale ,en position debout sur le flanc gauche (98.5%). La désinfection se fait dans 74.5% des cas à la chlorhexidine, 99% des confrères ont recours à un traitement anti microbien post opératoire, 85 % n’utilisent pas de traitement anti inflammatoire après l’intervention. Les vétérinaires estiment à 5.6% la fréquence moyenne des complications dans les trois premières semaines suivant la césarienne .A ce stade il s’agit d’une enquête purement descriptive appelée à être complétée. Un appel est lancé aux praticiens pour réfléchir aux avantages et inconvénients des différentes pratiques . La publication d’un cahier des charges de nature à aider les confrères est envisagé . [less ▲]

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See detailNeural substrates of the tendency of individuals to ruminate. Abstract Book of the conference.
Piguet, Camille; Sterpenich, Virginie; Desseilles, Martin ULg et al

Conference (2010, May 27)

Detailed reference viewed: 9 (0 ULg)
See detailLes voies traditionnelles de production d’hydrogène
Léonard, Angélique ULg

Conference (2010, May 27)

Detailed reference viewed: 15 (5 ULg)
See detailPiles à combustible : situation actuelle et perspectives
Job, Nathalie ULg

Conference (2010, May 27)

Detailed reference viewed: 23 (5 ULg)
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See detailAdvanced engine dynamics using MBS: Application to twin-cylinder boxer engines
Louvigny, Yannick ULg; Duysinx, Pierre ULg

Conference (2010, May 27)

Engine simulation is an important issue to design mechanical components and to reduce the development cost of new vehicles. Dynamic simulations of a twin-cylinder boxer engine are carried out with rigid ... [more ▼]

Engine simulation is an important issue to design mechanical components and to reduce the development cost of new vehicles. Dynamic simulations of a twin-cylinder boxer engine are carried out with rigid and flexible multibody models using the finite element approach. In a first step, simulations of the engine running at constant revolution speed (4000 rpm) are done taking advantages of the actual geometry of engine parts coming from CAD models. Forces due to the gas pressure are added in the simulation to calculate more precisely the load applied on each engine part. A mixed model is developed; pistons and connecting rods are considered as rigid bodies while the crankshaft is meshed with flexible brick elements. With this model, calculation of crankshaft stresses and displacements is possible. Then, simulations are made with engine speed variations to evaluate the effect of inertia. Due to the complex shape of the crankshaft, the CPU time and computer resources can be important. As simulations with a variable rotation speed have to be carried out on a larger number of engine revolutions, it becomes difficult to work with the fully detailed crankshaft geometry. So, simplified models (a tridimensional model with simplified geometry and a beam model) of the crankshaft are developed and compared. These models are first validated with different tests including results of constant speed flexible simulations. [less ▲]

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See detailEvidence for atypical categorical speech perception in Williams syndrome.
Majerus, Steve ULg; Poncelet, Martine ULg; Serniclaes, W. et al

Conference (2010, May 27)

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See detail18F labelling of Insulin via click chemistry
Paris, Jérôme ULg; Mercier, Frédéric ULg; Thonon, David ULg et al

Poster (2010, May 27)

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See detailEvaluation des capacités parentales
Degraux, Christine ULg

Conference (2010, May 27)

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See detailMethylmercury and selenium in vitro effects on harbor seal (Phoca vitulina) lymphocytes : a multidisciplinary approach
Dupont, Aurélie ULg; Bouquegneau, Jean-Marie ULg; Das, Krishna ULg et al

Poster (2010, May 26)

Methylmercury (MeHg) bioaccumulates along the food web, leading to the highest levels in tissues of predatory species. It constitutes the predominant form present in the blood of marine mammals. The blood ... [more ▼]

Methylmercury (MeHg) bioaccumulates along the food web, leading to the highest levels in tissues of predatory species. It constitutes the predominant form present in the blood of marine mammals. The blood cells, including the immune cells, are therefore exposed to the toxic properties of that chemical. Nevertheless, selenium (Se) is an essential element absorbed concomitantly to MeHg which seems to modulate this toxicity. The goal of this study is to evaluate the immunotoxicity of MeHg on the harbor seal (Phoca vitulina) T lymphocytes, highly important in the adaptive immune response, and to investigate the modulating effect of Se on that toxicity. In parallel, the concentrations of MeHg, total mercury (T-Hg) and Se are determined in free-ranging harbour seal blood in order to follow their contamination levels. The T lymphocytes were isolated from the whole blood, exposed to various MeHg and Se concentrations and the exposure effects were estimated by functional tests including the evaluation of viability, proliferation, metabolic activity, DNA and protein synthesis, and by morphological analysis by transmission electron microscopy. The mean T-Hg concentration was 172 ± 143 µg/l of whole blood. The T lymphocytes cultures in vitro displayed a decreasing number of viable cells with increasing concentrations of MeHg, and numerous ultrastructural defects. The cells exposed to MeHg notably displayed distortion of the plasmic membrane, nucleus fragmentations, chromatin compaction, swelling mitochondrias and cytoplasmic vacuolisations. Those results highlighted various immunotoxic effects of MeHg, both at the functional and ultrastructural levels. The antagonistic role of Se on MeHg immunotoxicity is discussed. [less ▲]

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See detailMultibody Dynamics Analysis of Differentials in Vehicle Drivetrains
Virlez, Geoffrey ULg; Bruls, Olivier ULg; Poulet, Nicolas et al

in Proceedings of the First Joint International Conference on Multibody System Dynamics (2010, May 26)

Differentials are critical components whose behaviour influences the dynamics of vehicles. They often include complex phenomena whose modeling is not always easy. In this paper, a model has been developed ... [more ▼]

Differentials are critical components whose behaviour influences the dynamics of vehicles. They often include complex phenomena whose modeling is not always easy. In this paper, a model has been developed for a limited slip differential (type C Torsen) which is mainly composed of an epicyclic gear train. In order to take into account flexibility, the nonlinear finite element method based on the absolute nodal coordinates has been chosen. The differential is modeled as a multibody system with various gear pairs and contact conditions. The model has been validated qualitatively and future work will address the identification of the various parameters and comparisons with experimental data. [less ▲]

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See detailEffects of androgenic and anti-androgenic substances on the freshwater gastropod Lymnaea stagnalis
Giusti, Arnaud ULg; Ducrot, Virginie; Joaquim-Justo, Célia ULg et al

Poster (2010, May 25)

Knowledge on the impacts of endocrine disrupting chemicals (EDCs) on gastropods is scarce and their mechanisms of action are still poorly understood. In this study, effects of 3 androgens (tributyltin ... [more ▼]

Knowledge on the impacts of endocrine disrupting chemicals (EDCs) on gastropods is scarce and their mechanisms of action are still poorly understood. In this study, effects of 3 androgens (tributyltin, testosterone and fenitrothion), 2 anti-androgens (cyproterone acetate and vinclozolin) and 1 estrogen (chlordecone) on growth and reproduction were investigated in the hermaphrodite gastropod Lymnaea stagnalis. [less ▲]

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See detailLe rôle du vagabondage de l’esprit dans le maintien d’un état anxiété
Stawarczyk, David ULg; Blanchy, Sarah ULg; D'Argembeau, Arnaud ULg

Poster (2010, May 25)

Le vagabondage de l’esprit (c’est-à-dire, l’apparition spontanée de pensées prenant leur origine dans la mémoire à long-terme et sans lien avec la tâche en cours de réalisation) est un phénomène fréquent ... [more ▼]

Le vagabondage de l’esprit (c’est-à-dire, l’apparition spontanée de pensées prenant leur origine dans la mémoire à long-terme et sans lien avec la tâche en cours de réalisation) est un phénomène fréquent qui représente en moyenne 10 à 30% de nos pensées journalières. Les recherches dans le domaine suggèrent que ce type de pensées est lié à la gestion de nos préoccupations actuelles et que sa fréquence peut être augmentée par l’induction d’affects négatifs. Cependant, le rôle possible de ces pensées dans le maintien des affects négatifs est encore mal connu. Dans cette étude, une préoccupation anxiogène (supposément devoir réaliser un discours filmé) ou une préoccupation neutre (supposément devoir réaliser une tâche cognitive de réflexion) a été induite immédiatement avant la réalisation d’une tâche exécutive d’inhibition durant laquelle la fréquence et le contenu des pensées distractives ont été évalués. Trois mesures de l’état émotionnel des participants ont été réalisées : (1) au début de la session, (2) après l’induction de la préoccupation et (3) après la tâche exécutive. Les résultats montrent la présence d’un plus grand nombre de pensées distractives liées à la préoccupation induite, d’un plus grand nombre d’erreurs d’inhibition ainsi que d’une augmentation significative des affects négatifs entre les temps 1 et 2 dans la condition anxiogène par rapport à la condition neutre. Par ailleurs, une corrélation négative entre le nombre de pensées distractives liées au discours et la diminution de l’anxiété entre les temps 2 et 3 est observée. Ces résultats démontrent l’importance des cognitions anticipatoires spontanées dans le maintient de l’anxiété. [less ▲]

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See detailMaternal transfer of trace metals to offspring in grey seals
Habran, Sarah ULg; Pomeroy, Paddy; Debier, Cathy et al

Conference (2010, May 25)

Marine mammals may display high heavy metal levels in their tissues, which raises the question of the importance of toxic metal transfer from mother to offspring. Some lactating female phocids fast during ... [more ▼]

Marine mammals may display high heavy metal levels in their tissues, which raises the question of the importance of toxic metal transfer from mother to offspring. Some lactating female phocids fast during the suckling period. This fasting period involves not only an important mobilization of energy reserves, but also mobilization of potentially associated contaminants. We studied maternal transfer of trace metals to offspring in the grey seal (Halichoerus grypus). Trace metal concentrations were measured in whole blood, milk and hair of mother-pup pairs in early and late lactation. Metal levels in blood decreased according to the following pattern: Fe > Zn > Se > Cu > Hg > Pb > Cr > V in mothers and pups. Cd and Ni were not detected and V, Cr and Pb levels were very low in maternal and pup blood. However, Ni and Pb levels were detected in the milk showing a transmammary transfer of these metals. Hg levels in blood and milk were higher than levels of previous metals and levels varied significantly throughout lactation. The increasing maternal levels over lactation were likely due to the remobilization of energy reserves during fasting and milk production in mothers causing a Hg release in blood. All metals were detected in hair and lanugo according to the following pattern: Fe > Zn > Hg > Cu > Se > Ni > V > Pb > Cd > Cr in mothers and Zn > Fe > Hg > Se > Cu > Pb > Ni > V > Cr > Cd in pups. Pb levels were relatively high in comparison with other phocid species. Only Hg showed a significant relationship between hair/lanugo and blood levels. This study highlights (i) a transplacental and transmammary transfer of metals in grey seals, and shows that (ii) physiological processes such as lactation and/or fasting can modify trace metal levels in the blood of mothers and pups. [less ▲]

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See detailGlucose-responsive layer-by-layer microcapsules: a potential route to self-regulated insulin delivery
Alaimo, David ULg; Detrembleur, Christophe ULg; Auzély-Velty, Rachel et al

Conference (2010, May 25)

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See detailTailor-made polymers by cobalt-mediated radical polymerization
Debuigne, Antoine ULg; Hurtgen, Marie ULg; De Winter, Julien et al

Poster (2010, May 25)

Detailed reference viewed: 56 (11 ULg)
Peer Reviewed
See detailSynthesis and Characterization of Mechanically linked copolymers
Van Quaethem, A.; Lussis, Perrine ULg; Duwez, Anne-Sophie ULg et al

Conference (2010, May 25)

Detailed reference viewed: 11 (0 ULg)
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See detailConformation of Homopolypeptides Studied by Single Molecule Force Spectroscopy
Willet, N.; Lecommandoux, S; Hinterdorfer, P et al

Conference (2010, May 25)

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See detailStimuli-responsive triblock copolymer for biomedical applications
Sibret, Pierre ULg; Croisier, Florence ULg; Zhao, J. et al

Poster (2010, May 25)

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See detailRadar Classification based on Extra-Trees
Pisane, Jonathan ULg; Marée, Raphaël ULg; Wehenkel, Louis ULg et al

(2010, May 24)

In this paper, we describe a new automatic target recognition algorithm for classifying SAR images based on the PiXiT im- age classifier. It uses randomized sub-windows extraction and extremely randomized ... [more ▼]

In this paper, we describe a new automatic target recognition algorithm for classifying SAR images based on the PiXiT im- age classifier. It uses randomized sub-windows extraction and extremely randomized trees (extra-trees). This approach re- quires very little pre-processing of the images, thereby lim- iting the computational load. It was successfully tested on an extended version of the public standard MSTAR database, that includes targets of interest, false targets, and background clutter. A misclassification rate of about three percent has been achieved. [less ▲]

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See detailImpacts of androgenic and antiandrogenic substances on the freshwater pulmonate gastropod Lymnaea stagnalis
Giusti, Arnaud ULg; Lagadic, Laurent; Joaquim-Justo, Célia ULg et al

Poster (2010, May 23)

Knowledge on the impacts of endocrine disruptors on gastropods is scarce and their mechanism of action poorly understood especially the impacts of androgenic and antiandrogenic compounds. In this study ... [more ▼]

Knowledge on the impacts of endocrine disruptors on gastropods is scarce and their mechanism of action poorly understood especially the impacts of androgenic and antiandrogenic compounds. In this study effects of 5 androgenics and antiandrogenics endocrine disruptors were investigated on the reproduction and life traits of the freshwater pulmonate gastropod Lymnaea stagnalis. The chemicals tested were Tributyltin, Cyproterone acetate, Methyltestosterone, Vinclozolin and Fenitrothion. Tributyltin was used as androgenic positive control. The other compounds tested are androgenic and antiandrogenic compounds either steroids or non steroids. Adult snails were exposed to 3 concentrations of each chemical for 30 days. The size and reproductive organs development were monitored throughout exposure. The number of clutches, the number of eggs per clutch were assessed during the first 10 days. The clutches were kept individually in clear water except for the clutches of the eighth day which were divided in two. Half was kept individually in clear water and the other half was individually reared in contaminated water following the same exposure as their parents. The percentage of hatching per clutch of these clutches was measured. The development size, mortality, and development of reproductive organs of the juveniles were assessed until their first clutch was laid. [less ▲]

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See detailRelationship between BET specific surface area, DR- and t-plot pore volume
Scherdel, C.; Reichenauer, G.; Wiener, M. et al

Poster (2010, May 23)

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See detailImpact of anti-androgens on the production of spermatozoa in Brachionus calyciflorus
Joaquim-Justo, Célia ULg; Cruciani, Valentina ULg; BLASZCZYK, Marie ULg et al

Poster (2010, May 23)

Putative endocrine disruptors affect rate of fertilization of sexual females by males. Preston et al. (2000) reported a decrease in fertilization rate following exposition to, notably, flutamide at 10µg/l ... [more ▼]

Putative endocrine disruptors affect rate of fertilization of sexual females by males. Preston et al. (2000) reported a decrease in fertilization rate following exposition to, notably, flutamide at 10µg/l. We observed similar effects with fenitrothion. Cross mating experiments showed that the decrease in fertilization rate is due to an impact on males exclusively. We studied the impact of anti-androgens on spermatogenesis and observed a decrease in the spermatozoa production with concentrations down to 0,5 mg L-1.We also report a detailed description of the morphology of the male reproductive apparatus in B. calyciflorus based on optic and electronic microscopy analysis and we describe the effect of anti-androgens on males and spermatogenesis in males. [less ▲]

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See detailDesign of River Navigation weirs and Flood Protection Barriers
Rigo, Philippe ULg; Sarghiuta, Radu; Herbillon, Vincent ULg et al

in 78th ICOLD Annual Meeting - Hanoi 2010 (2010, May 23)

The aim of the WG (Working Group) was to conduct a comprehensive review (state-of-the-art) of the modern technologies, design tools and recent research used to design and build structures controlling ... [more ▼]

The aim of the WG (Working Group) was to conduct a comprehensive review (state-of-the-art) of the modern technologies, design tools and recent research used to design and build structures controlling water level and flow in rivers, waterways and ports (for navigation & flood protection). The WG considered regulatory structures such as: - Gates controlling water level and flow in rivers (even non navigable) and waterways (lifting gate, tilting gate, radial gate, sector, etc.; designed in one piece or with an upper flap). These are referred to as WEIRS. - Gates controlling water level and flow in estuaries with regards to high tides and storms (lifting gate, articulated, tilting, rolling, floating, sliding, etc.). These structures are referred to as BARRIERS. [less ▲]

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See detailLes enzymes et leur utilisation en biotechnologie industrielle
Galonde, Nadine ULg

Poster (2010, May 22)

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See detailLa GRH, levier de changement?
Pichault, François ULg

Conference (2010, May 22)

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See detailNouveaux agents anti-inflammatoires en série N-(4-pyridyl)alcanesulfonamide
Renard, Jean-François ULg; Lecomte, Frédéric ULg; de Leval, Xavier et al

Conference (2010, May 21)

Detailed reference viewed: 71 (19 ULg)
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See detailmiR-146a: an anti-angiogenic miRNA regulated by NF-kB
Halkein, Julie ULg; Tabruyn, Sébastien ULg; Malvaux, Ludovic et al

Poster (2010, May 21)

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See detailInvolvement of miR-125b in in vitro and in vivo angiogenesis
Malvaux, Ludovic; Pendeville, Hélène; Sabatel, Céline et al

Poster (2010, May 21)

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See detail16K human prolactin is an anti-lymphangiogenic factor in vitro and in vivo
Kinet, Virginie; Castermans, Karolien; Blacher, Silvia ULg et al

Poster (2010, May 21)

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See detailComplementation of Saccharomyces cerevisiae mutants using a soil metatranscriptomic library
Kellner, Harald ULg; Luis, Patricia; Portetelle, Daniel ULg et al

Poster (2010, May 21)

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See detailPolitiques, stratégies et pratiques en cours à la FAPSE de l’ULg et dans les Hautes Écoles de la Communauté française de Belgique
Denis, Brigitte ULg

Conference (2010, May 20)

The author presents different uses of ICT in courses and training curriculums at the Faculty of Psychology and Educational Sciences of the University of Liège. She also deals with some considerations on ... [more ▼]

The author presents different uses of ICT in courses and training curriculums at the Faculty of Psychology and Educational Sciences of the University of Liège. She also deals with some considerations on initial and continuous training in ICTE uses in High Schools of the French Community of Belgium. The presentation ends on different elements to be considered about policies, strategies and practices (e.g. Insertion of courses in the official initial training curriculums, teachers' certification in ICT and ICTE in Higher Education, ICT mastery...ergonomy and acceptability of tools, isomorphism principle, evaluation, creation and animation of networks and communities of practice to sustain contiunous traing). [less ▲]

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See detailHow King Leopold II used Emile de Laveleye’s intellectual network for the benefit of his African project…
Vandersmissen, Jan ULg

Conference (2010, May 20)

The “Belle Epoque” saw the revival of the colonial idea in new forms. A second European colonization wave washed over Africa. King Leopold II unfolded his activities in Congo from 1876 onwards. There, his ... [more ▼]

The “Belle Epoque” saw the revival of the colonial idea in new forms. A second European colonization wave washed over Africa. King Leopold II unfolded his activities in Congo from 1876 onwards. There, his efforts to develop a so-called “philanthropic” enterprise soon evolved in a process of state formation, overshadowed by intrigues and tensions that were a consequence of colonial competition between the western powers. Only a decade later, at the Berlin Conference of 1885, a definite arrangement was adopted. Everywhere in Europe, a disputed transition was made from liberal to more conservative ways of government. Of course this tension field also dominated intellectual life. There was an intense debate between partisans of colonialism and supporters of worldwide free trade. For the development of his colonial doctrine Leopold II had been inspired by intellectuals that supported economic expansionism. Most of them were active in the field of economic geography. But the King also searched for support in other academic circles and mobilized one of Europe’s brightest minds to join him in his quest for the most adequate economic, social and political model of a future state in the heart of Africa. In his books, articles and pamphlets, the liberal minded political economist Emile de Laveleye (1822-1892) – an opinion maker of European renown – showed himself an unshakable opponent of colonization and imperialism. However, in the period 1875-1885 – a decade so crucial for Congo – a surprising intellectual rapprochement between de Laveleye and Leopold II was established. For a certain time, this competent man of science advised the King, for example at the International Geographical Conference in Brussels, putting into royal service an intellectual network of European range. This paper investigates how, in the complex and constantly evolving public discussion about Congo, two apparently opposing minds attracted each other. Analyzing de Laveleye’s publications and correspondence we focus on his important pleas for a “neutral and international formula” that would place Leopold II in a conflicting situation with Portugal and France, countries that claimed Congo’s estuary for their own benefit. De Laveleye believed that Leopold was sincere about his civilizing mission and crusade against slavery. This study shows how, in the years preceding the Berlin Conference, de Laveleye got actively involved in a carefully orchestrated European media campaign in support of Leopold’s initiative. It was there that his intellectual circle became extremely useful and was fully implicated. His contacts in the world of law, especially among experts of international law, contributed to the important discussions about Congo’s juridical status. De Laveleye’s colleague Sir Travers Twiss, one of the most reputed jurists of that time, as well as the influential Institut de Droit international, of which de Laveleye had been one of the founders, entered the debate zone and took positions that were favorable for Leopold’s project. With this new approach, our paper also aims to give insight in the way Leopold II transformed his own reasoning into a more authoritative set of practical standards that were shared by an intellectual elite. [less ▲]

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See detailEtude du mode de liaison des canaux potassiques de type SK et l’apamine par modélisation moléculaire
Dilly, Sébastien ULg; Lamy, Cédric; Seutin, Vincent ULg et al

Poster (2010, May 20)

Parmi les canaux ioniques impliqués dans le contrôle de l'activité neuronale, les canaux potassiques calcium-dépendants de basse conductance, dénommés canaux SK, constituent une cible thérapeutique ... [more ▼]

Parmi les canaux ioniques impliqués dans le contrôle de l'activité neuronale, les canaux potassiques calcium-dépendants de basse conductance, dénommés canaux SK, constituent une cible thérapeutique intéressante. En effet, ils sous-tendent la posthyperpolarisation ("AfterHyperPolarization") de durée moyenne (mAHP) qui limite l'excitabilité de divers types de neurones du système nerveux central (SNC). A ce jour, 3 types de sous-unités, SK1, SK2 et SK3, ont été identifiés dans différentes régions du cerveau. Le blocage sélectif de ces canaux pourrait être bénéfique dans le traitement de divers troubles du SNC comme la maladie de Parkinson (SK3), la dépression (SK3) ou encore les désordres cognitifs (SK2) (Liégeois et al., 2003 ; Pedarzani et al., 2008). Jusqu’à présent, le site d’interaction entre les canaux SK et leurs bloqueurs n’a pas encore été précisément élucidé. Dans ce contexte, nous avons entrepris la modélisation de ces canaux par homologie comparative en se basant sur la structure cristalline du canal potassique KCSA (Doyle et al., 1998). La construction de ces canaux constitue la première étape dans la détermination des requis structuraux essentiels à l’affinité de bloqueurs et à la compréhension des modes de liaison de ces ligands. Le mode de liaison de l’apamine, bloqueur peptidique issu du venin d’abeille, a été ensuite exploré par « docking ». Afin de confirmer ce site de liaison potentiel, des expériences de mutagénèse dirigée ont été réalisées. Les premiers canaux mutants testés dans des expériences électrophysiologiques par la technique de « patch clamp » ont permis de valider certaines données théoriques. Grâce à cette stratégie, nous espérons préciser le mécanisme d'action des bloqueurs des canaux SK et, idéalement, découvrir des pistes pour concevoir des bloqueurs sélectifs. [less ▲]

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See detailL’orgueil de Foucault. Ontologie, expérience et critique
Bolmain, Thomas ULg

Conference (2010, May 20)

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See detailPerte et ressources dans les nouvelles familles: le cas des familles recomposées
D'Amore, Salvatore ULg; Gresse, Karin; Pauss, Véronique

Conference (2010, May 19)

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See detailFrom defects to causes: pathology of concrete and investigation methods.
Courard, Luc ULg; Van der Wielen, Audrey ULg; Darimont, Anne ULg

in Startegjia Izvedbe Sanacij Objektov (2010, May 19)

The proper planning of investigations before carrying out repair works is important if optimum use is to be made of the test data. A major step needs to be taken from knowing, for example, that chloride ... [more ▼]

The proper planning of investigations before carrying out repair works is important if optimum use is to be made of the test data. A major step needs to be taken from knowing, for example, that chloride is present in the concrete, to select the best methods for repair. Engineers require guidance on both the techniques available for the condition assessment of structures and the methods for data interpretation. Two major stages are usually recommended for such an operation: the first stage is based on a rapid-scan visual assessment, often including limited sampling in areas obviously damaged, from which areas can be selected for more detailed investigations. The second stage contains a detailed diagnostic survey that relies on destructive and non destructive testing techniques. Non destructive techniques are more and more utilized not only for the evaluation of the concrete strength but also for the detection of cracks and delaminations. Moreover, the interest for techniques able to evaluate concrete permeability is rising, due to the importance of this factor for durability evaluation. The paper will discuss the assessment of concrete structures and describe the main destructive and non destructive techniques with regard to specific pathologies. [less ▲]

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See detailConclusions : à quelles conditions pouvons-nous travailler ensemble?
Dozo, Björn-Olav ULg; Clavert, Frédéric

Conference (2010, May 19)

Detailed reference viewed: 19 (0 ULg)
See detailles stéréotypes sexués à l'adolescence et les enjeux scolaires
Gavray, Claire ULg

Conference (2010, May 19)

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See detailL’apprentissage au secours de la réduction de dimension pour des problèmes d’optimisation
Ben Abbes, Ala; Rachelson, Emmanuel ULg; Diemer, Sébastien

in Actes de la Conférence Francophone d'Apprentissage (2010, May 19)

Pour assurer la stabilité du réseau électrique, la production doit être ajustée en quasi temps réel à la consommation. Cet ajustement ne peut porter que sur un nombre limité de centrales et doit être ... [more ▼]

Pour assurer la stabilité du réseau électrique, la production doit être ajustée en quasi temps réel à la consommation. Cet ajustement ne peut porter que sur un nombre limité de centrales et doit être effectué dans des délais réduits. La combinatoire du problème rend la recherche d’un optimum économique par des méthodes d’optimisation classiques très difficile. Ce travail cherche à montrer l’intérêt d’utiliser des algorithmes d’apprentissage supervisé performants comme le Boosting, pour sélectionner les centrales à redéclarer. Cette sélection préalable permet ensuite de réduire considérablement le temps de l’optimisation des programmes de production tout en garantissant l’optimalité économique. [less ▲]

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See detailDe la prévention chronologique à la prévention relationnelle; la prévention quaternaire comme tâche du médecin de famille.
Jamoulle, Marc ULg

Poster (2010, May 19)

La prévention clinique est traditionnellement exprimée comme une vue du médecin sur une tâche à réaliser avant la survenue d’un évènement. Initiée par Leavell et Clark en 1958 elle est complétée en 1988 ... [more ▼]

La prévention clinique est traditionnellement exprimée comme une vue du médecin sur une tâche à réaliser avant la survenue d’un évènement. Initiée par Leavell et Clark en 1958 elle est complétée en 1988 par J-A Bury qui dénomme prévention quaternaire les soins palliatifs.Le paradigme change, le patient devient central aux soins, la prévention clinique est perçue au travers de la relation entre le médecin et le patient. Le croisement de la science du médecin et de la conscience du patient permet de répartir la prévention en quatre champs. Elle est traversée en oblique par la ligne du temps. Cette proposition (Jamoulle, 1986) a été avalisée par la Wonca et l’UEMO et permet de cadrer quatre concepts de prévention clinique. [less ▲]

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See detailThe partial proportional odds model in the analysis of
Donneau, Anne-Françoise ULg

Conference (2010, May 18)

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See detailBiological control using Episyrphus balteatus (De Geer) (Diptera: Syrphidae)
Leroy, Pascal ULg; Verheggen, François ULg; Capella, Quentin et al

Poster (2010, May 18)

Augmentative biocontrol constitutes a safe way to reduce pest populations through the enhancement of natural enemies’ activity. In this context, the aphidophagous syrphid Episyrphus baltetaus (De Geer ... [more ▼]

Augmentative biocontrol constitutes a safe way to reduce pest populations through the enhancement of natural enemies’ activity. In this context, the aphidophagous syrphid Episyrphus baltetaus (De Geer) (Diptera: Syrphidae) is a promising candidate for aphid biological control: larvae of this syrphid attack and consume a wide range of aphid species and are found on many vegetable crops. Because natural populations of beneficials are not always sufficient to regulate the pest infestations, this work has focused on the conception of a biological control device containing syrphid eggs which can easily be introduced in fields or greenhouses. Using semiochemicals [E-(β)-farnesene, R-(+)-limonene and (Z)-3-hexenol], honeydews and “artificial honeydews” (10% or 30% aqueous solutions of sucrose, fructose and glucose), the syrphid oviposition was artificially induced on an inert surface. To test and validate the biological control device described above, laboratory and field experiments were performed: a plastic lamella covered with syrphid eggs was suspended on aphid infested plants in order to measure the efficiency of the device. The results obtained were promising since populations of 500 aphids were eliminated in ten days when 15 syrphid eggs were introduced. The use of such a biological control device could certainly contribute to aphid biological control strategies. [less ▲]

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See detailThe occurrence of multicolored ladybird, Harmonia axyridis Pallas, a biological control agent in agroecosystems in Wallonia
Vandereycken, Axel ULg; Durieux, Delphine ULg; Haubruge, Eric ULg et al

Conference (2010, May 18)

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted ... [more ▼]

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted to temperate climate conditions and to spread out all over Europe. Now, H. axyridis is one of the coccinellid with the biggest size in Belgium, causing damages to the ecosystems through e.g. intraguild predation (IGP). We are still lacking information about the consequences of the introduction of this superpredator in our agro-ecosystems. This work focuses on the potential impacts of H. axyridis on the entomofauna associated with several crops (potatos, corn, wheat, broad bean). We evaluated in 2009 the occurrence as well as the interactions between aphids and their natural enemies (hoverflies, coccinellids and lacewings) in several agro-ecosystem sites in northern Wallonia. After one year of field observations, were found thirteen coccinellid species, most of the catched individuals being H. axyridis with 64% of the coccinellids, Propylea 14-punctata, 15%, or Coccinella 7-punctata, 14%. This invasive ladybird dominates the group of coccinellids generally in all crops in north Wallonia. The results with the sticky traps show that the maximum occurrence of H. axyridis in crops is observed in chicory, sugar beet and potatoes. The relationship aphid-ladybird in wheat for example, brings out that increase of density of Asian ladybird in mid-July follow the increase of aphids (Sitobion avenae, Sitobion fragariae, Metopolophium dirhodum, Aphis fabae) in the end of June. We also observe that, in most agro-ecosystems, hoverflies and lacewings are the dominant aphid natural enemies. In all crops investigate, the multicolored ladybird occurs with 5% of the aphidophagous after the Chrysopidae, 12% and the Syrphidae, 76%. In 2009, the agro-ecosystems with the most aphidophagous species are carrot and broad bean and these habitats are dominated by hoverflies. [less ▲]

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See detailA l’interface de l’humain et du non-humain : apprendre à être affecté.
Strivay, Lucienne ULg

Conference (2010, May 18)

Detailed reference viewed: 76 (18 ULg)
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See detailStructuring effects of different lecithins on palm oil-based blends
Danthine, Sabine ULg; Delacharlerie, Sophie ULg; Flöter, Eckhard

Conference (2010, May 18)

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See detailComputational study of the error distribution in right-censored and selection-biased regression models
Laurent, Géraldine ULg; Heuchenne, Cédric ULg

Conference (2010, May 18)

Consider the regression model Y = m(X) + σ(X) Ɛ where m(X) =E [Y|X] and σ²(X) = Var [Y|X] are unknown smooth functions and the error Ɛ, with unknown distribution, is independent of X. The pair (X,Y) is ... [more ▼]

Consider the regression model Y = m(X) + σ(X) Ɛ where m(X) =E [Y|X] and σ²(X) = Var [Y|X] are unknown smooth functions and the error Ɛ, with unknown distribution, is independent of X. The pair (X,Y) is subject to generalized selection bias and the response to right censoring. We construct a new estimator for the cumulative distribution function of the error Ɛ, and develop a bootstrap technique to select the smoothing parameter involved in the procedure. The estimator is studied via extended simulations and applied to real unemployment data. [less ▲]

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See detailThe modified Reyment's multivariate coefficient of variation
Zhang, Lixin ULg

Conference (2010, May 18)

Detailed reference viewed: 44 (9 ULg)
See detailA Far-UV Imager for the Jupiter Ganymede Orbiter
Bunce, E. J.; Molyneux, P.; Bannister, N. et al

Poster (2010, May 17)

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See detailAccompagner une réforme vers des programmes visant le développement de compétences – difficultés et leviers –
Poumay, Marianne ULg; Tardif, Jacques

Conference (2010, May 17)

En 2007, au sein de l’Université de Liège, l’IFRES a lancé un programme interne de financement et d’accompagnement de projets facultaires. Dans les projets sélectionnés, les enseignants s’engageaient à ... [more ▼]

En 2007, au sein de l’Université de Liège, l’IFRES a lancé un programme interne de financement et d’accompagnement de projets facultaires. Dans les projets sélectionnés, les enseignants s’engageaient à progresser concrètement dans l’opérationnalisation de formations orientées vers le développement de compétences chez leurs étudiants. A travers ce programme « compétences », l’objectif de l’IFRES était d’amorcer des réformes qui visent l’amélioration de l’apprentissage des étudiants. Suite à la nécessaire description de l’initiative et de quelques résultats concrets, le présent article mentionne brièvement les difficultés d’ordre institutionnel ou organisationnel et s’attarde surtout à déterminer et illustrer des problèmes conceptuels qui se posent dans ce type de réforme. Il mentionne certains freins et facteurs facilitateurs, soulignant entre autres l’intérêt d’un accompagnement semi-collectif par un consultant externe (en l’occurrence Jacques Tardif) et d’une large communication sur les avancées des projets en cours. [less ▲]

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See detailJupiter's and Saturn's auroras as observed by the Hubble Space Telescope
Nichols, J. D.; Grodent, Denis ULg

Conference (2010, May 17)

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See detailGeometrical Effects on the Dynamical Behavior of MEMS structures
Pustan, Marius ULg; Golinval, Jean-Claude ULg; Rochus, Véronique ULg

(2010, May 16)

The influence of geometrical dimensions on the dynamical behavior of polysilicon MEMS structures configurations is studied and presented in this paper. Electrostatically actuated MEMS components as ... [more ▼]

The influence of geometrical dimensions on the dynamical behavior of polysilicon MEMS structures configurations is studied and presented in this paper. Electrostatically actuated MEMS components as microbridges and microcantilevers are used to investigate the coupled electro-mechanic effect, frequency responses and the dynamic bending stress. The electrostatic principle is common in sensing and acting devices and there are many MEMS structures subjected to electrostatic forces. [less ▲]

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See detailImpact de tests formatifs en ligne sur l’implication et la perception de leur utilité par des étudiants en médecine vétérinaire
Hanzen, Christian ULg; Crahay, Vinciane ULg; Detroz, Pascal ULg et al

in Proceedings du 26ème congrès (2010, May 15)

La dynamique motivationnelle des étudiants est un phénomène complexe. Les activités d’évaluation sont de nature à influencer ses principaux déterminants que sont la perception que l’étudiant a de sa ... [more ▼]

La dynamique motivationnelle des étudiants est un phénomène complexe. Les activités d’évaluation sont de nature à influencer ses principaux déterminants que sont la perception que l’étudiant a de sa compétence et du contrôle qu’il peut opérer sur une activité d’apprentissage fusse-t-elle évaluative. Par ailleurs elles sont également de nature à renforcer son degré de persévérance et donc à mettre en œuvre des stratégies d’auto-motivation. Ce constat nous a incités à mettre en place au cours de l’année académique 2009-2010 un design d’évaluation des 268 étudiants de 2ème graduat en médecine vétérinaire (5ème année du cursus). Il concerne les 40 heures d’enseignements théoriques du cours de Thériogenologie des animaux de production. Dix tests formatifs constitués de 10 questions à choix multiples avec solutions générales implicites et degrés de certitude (+20/-20) ont été hebdomadairement proposés durant le premier semestre de l’année académique 2009-2010. Ces tests d’une durée de 20 minutes ont en ligne mis à disposition des étudiants via la plateforme Exams. L’ensemble des 100 questions a fait l’objet d’un dernier test préparatif deux semaines avant le test certificatif de 60 questions organisé au cours de la première semaine du mois de janvier 2010. Chaque test a été suivi 24 heures plus tard de retroactions individuelles (corrections des questions et justifications des réponses correctes) et de groupe (résultats nominatifs de tous les étudiants). Les étudiants ont par ailleurs été invités à remplir un questionnaire de satisfaction avant leur passation du test certificatif. Au travers de ce design nous souhaitions répondre à différentes questions relatives à l’implication et à la démarche réflexive des étudiants à l’encontre des activités d’évaluation proposées. Ainsi en ce qui concerne leur implication avons-nous cherché à savoir (1) leur degré de participation aux tests formatifs, (2) son évolution au cours du temps, (3) leur degré de persévérance, (4) l’effet de leur persévérance sur leur degré de réussite non seulement aux tests formatifs mais également certificatif, (5) leur utilisation des degrés de certitude (6) son évolution au cours du temps et (7) les différences éventuelles existant entre les filles et les garçons. De même en ce qui concerne l’analyse de leur démarche réflexive avons-nous cherché à préciser (1) leur sentiment de validité du score obtenu c’est-à-dire sa capacité à refléter ce qu’il prétendait mesurer, (2) leur sentiment à l’encontre de l’impact des degrés de certitude sur leurs résultats, (3) l’impact des retro-actions individuelles et de groupe fournies après chaque évaluation pour interpréter leurs performances, (4) réguler leurs apprentissages, (5) l’impact émotionnel de la comparaison avec les résultats des collègues, (6) les différences éventuelles entre les garçons et les filles. [less ▲]

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See detail3D Modelling of the Black Sea northwestern Shelf Ecosystem
Capet, Arthur ULg; Grégoire, Marilaure ULg

Conference (2010, May 14)

Some validation procedures are presented concerning the physicis and the biology, as well as the decomposition of the oxygen cycle in its different components. The role of the Sevastopol eddy of retaining ... [more ▼]

Some validation procedures are presented concerning the physicis and the biology, as well as the decomposition of the oxygen cycle in its different components. The role of the Sevastopol eddy of retaining POM in the Crimea peninsula causing intense bacterial oxygen consumption is evidenced. [less ▲]

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See detailAdolescence et délinquances : quand la puberté s’en mêle …De l’intérêt d’une approche biopsychosociale de la délinquance adolescentaire
Glowacz, Fabienne ULg

Conference (2010, May 13)

De nombreuses recherches (Kaltiala-Heino et al., 2003 ; Parent et al., 2003 ; Beaver § Wright, 2005 ; Haynie § Piquero 2006 ; Lynne et al., 2007,..) ont établi ces dernières années un lien entre le ... [more ▼]

De nombreuses recherches (Kaltiala-Heino et al., 2003 ; Parent et al., 2003 ; Beaver § Wright, 2005 ; Haynie § Piquero 2006 ; Lynne et al., 2007,..) ont établi ces dernières années un lien entre le développement pubertaire et l’engagement à l’adolescence dans des comportements délictueux, usage de drogue, conduites sexuelles et autres comportements exploratoires et déviants. Felson et Haynie (2002) affirment que le développement pubertaire a des effets sur différents types de délinquance comparables à d’autres puissants prédicteurs de la délinquance. Bien que l’étude de Williams et Dunlop (1999) constate que les garçons à maturité précoce et tardive présentent des taux plus élevés de délinquance que leurs pairs à maturation normale, des recherches plus récentes (Ge et al., 2002 ; Beaver § Wright, 2005 ; Michaud et al., 2006 ; Lynne et al., 2007…) soutiennent l’hypothèse de la précocité pubertaire en tant que facteur de risque : les garçons à puberté précoce ont un plus haut niveau d’engagement dans des comportements délinquants et agressifs, alors que les garçons à puberté tardive s’engagent dans moins de délinquances (de type crime, violence, atteintes aux biens, usage de drogue). La délinquance sexuelle juvénile, au croisement de la délinquance et de la sexualité, incite à un questionnement sur les effets de la puberté au niveau des conduites sexuelles déviantes. Notre recherche « Adolescence, délinquances et processus pubertaire » portant sur un échantillon de 316 adolescents âgés de 13 à 18 ans, a notamment évalué l’incidence du timing pubertaire au niveau de l’adoption de conduites délinquantes sexuelles et non sexuelles. Nos résultats confirment la pertinence de la prise en compte du développement pubertaire dans les processus de socialisation et d’engagement dans la délinquance générale et/ou sexuelle à l’adolescence. [less ▲]

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See detailA paleolimnological study of Lake Kivu (East Africa)
Knops, Sébastien; Darchambeau, François ULg; Verleyen, Elie et al

Conference (2010, May 13)

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See detailvandaliser à l'adolescence
Gavray, Claire ULg; vettenburg, Nicole

Conference (2010, May 13)

The personal factor which explain vandalism amongst adolescents differ according to gender group. In the male group, we find an important impact of the valuation of violence and of the feeling of social ... [more ▼]

The personal factor which explain vandalism amongst adolescents differ according to gender group. In the male group, we find an important impact of the valuation of violence and of the feeling of social and statutory victimisation. In the female group, we find track of early victimisation in the family and the other spheres. [less ▲]

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