References of "Scientific congresses and symposiums"
     in
Bookmark and Share    
Full Text
See detailWhat, how, and why to mix research methods in the study of career patterns?
Dodeigne, Jérémy ULg

Conference (2014, July 20)

Political careers have become more diversified in multi-level systems over the last decades. In ‘classic’ federations (e.g. the US, Canada, and Germany), regional offices have become attractive positions ... [more ▼]

Political careers have become more diversified in multi-level systems over the last decades. In ‘classic’ federations (e.g. the US, Canada, and Germany), regional offices have become attractive positions with the process of professionalization. In newly regional political systems (e.g. Belgium, Spain, and the UK), the regional level has been quickly perceived by ambitious candidates as a professionalized political arena. Overall, regional positions in multi-level contexts are no longer conceived as amateur positions or mere stepping stones towards the national level. Despite the growing literature on the topic, several methodological questions remain nonetheless opened. This paper discusses the benefits and limitations of a mix-methods research design relevant for the study of elites’ career patterns. Specifically, the paper presents how and why mixing two quantitative and qualitative methods: survival analysis and life story interviews (for the purpose of illustration, the paper relies on empirical data: 1.831 careers and 84 life stories). Firstly, I introduce separately the added-value of each research methods (I especially discuss the benefits of these approach to collect and analyze longitudinal data in a context of multi-level system). Secondly, I demonstrate how these two methods permit to better understand elites’ career patterns in the context of multi-level systems. [less ▲]

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detailThe Man in the Moon: A Survival of Germanic Mythology?
Dor, Juliette ULg

Conference (2014, July 17)

Men and women imagined the presence of the Man in the Moon in order to account for the spots in the full moon. There are a number of references to him (and sometimes to a woman) in English folklore and ... [more ▼]

Men and women imagined the presence of the Man in the Moon in order to account for the spots in the full moon. There are a number of references to him (and sometimes to a woman) in English folklore and literature (seal of Walter de Grendon, nursery rhymes, Neckam, ME poem, Chaucer, Shakespeare…). He was thought to have been exiled there and carries a thorn bush on his back because he once stole thorns from hedges (or violated some religious commandment). There is a variant of the legend in Snorri: the moon-god Máni (ON ‘moon’) once took two children from earth when they were coming from a spring carrying a bushel and a pole on their shoulders; as can be seen from the earth, the boy and the girl are still in the sky and follow the moon. I want to argue that this familiar Scandinavian and English figure – but also present in France and Wallonia -probably derives from an ancient Germanic myth that developed slightly differently among the Northern and Western countries, and that the two traditions eventually merged due to the contacts between the Scandinavians and the English. [less ▲]

Detailed reference viewed: 11 (3 ULg)
Full Text
Peer Reviewed
See detailInventory-routing problem with pickups and deliveries of RTI in closed-loop supply chain
Iassinovskaia, Galina; Limbourg, Sabine ULg; Riane, Fouad

Conference (2014, July 17)

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their Returnable Transport Items (RTIs) among different partners of a ... [more ▼]

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their Returnable Transport Items (RTIs) among different partners of a closed-loop supply chain. This research deals with an inventory-routing problem with pickups and deliveries of RTIs. A mixed-integer linear program is developed and tested on small instances. To handle realistic large size problems, a clustering algorithm is coupled with a simulation model. This hybrid heuristic allows assessing the benefits of information and RTIs sharing among partners. [less ▲]

Detailed reference viewed: 37 (8 ULg)
Full Text
Peer Reviewed
See detailResorcinol-Formaldehyde Carbon Xerogels as Lithium-Ion Battery Anodes: Synthesis, Grinding, Coating on current collector and Electrochemical characterization
Piedboeuf, Marie-Laure ULg; Léonard, Alexandre ULg; Pirard, Jean-Paul ULg et al

Poster (2014, July 17)

Rechargeable lithium-ion batteries show great advantages over traditional batteries and are extensively used for consumer electronic devices due to their high energy density and long cycle life. However ... [more ▼]

Rechargeable lithium-ion batteries show great advantages over traditional batteries and are extensively used for consumer electronic devices due to their high energy density and long cycle life. However, the improvement of performance of current lithium-ion batteries requires the optimization of the materials used (electrolyte and electrodes). Therefore, tremendous efforts have been dedicated to exploring new materials with high capacity, excellent cycling performance, low cost and high safety features [1-4]. As an example, carbon xerogels are promising candidates in the development of new high performance C-based anode materials for Li-ion batteries, since such carbonaceous materials show very small changes of volume during the charge/discharge process, providing an improved cycle life. Nevertheless, hard carbons also exhibit quite high irreversible capacity losses due to their intrinsic high microporosity and, compared to graphite, a poor rate performance related to slow diffusion of Li in the internal structure [5-6]. To reduce these disadvantages, the structural and textural characteristics need to be carefully controlled. Also, due to the different morphology of these materials compared to graphite, the deposition of carbon xerogels on current collectors needs to be studied in detail. In this work, porous carbon xerogels were synthetized from Resorcinol-Formaldehyde mixtures by adjusting the pH of the solution in order to obtain different mesopore sizes. Monoliths of carbon xerogels were obtained after drying of the polymer gel and pyrolysis [7]. Mercury intrusion porosimetry and nitrogen adsorption techniques (BET) was used to characterize the pore texture of the carbon xerogels. These monoliths were ground to particles around 10 µm for all the samples. The resulting powders were then mixed with a binder and a solvent to form slurries and then cast on copper foil using a bar coater. After evaporation of the solvent, the resulting coatings were analyzed using scanning electron microscopy (SEM) for the morphology and their thickness was monitored by profilometry. The resulting electrodes were subjected to electrochemical characterization. Since the particle sizes and the method of coating was the same for all the samples, it was possible to evaluate selectively the influence of the textural and structural parameters of the different carbon materials on their performances. Electrochemical characterizations were performed using charge-discharge galvanostatic curves and cyclic voltammetry in Li/C half cells between 0.005 and 1.5 V vs. Li+/Li. References 1) Goodenough J.B., Kim Y. J. Power Sources 2011; 196(16): 6688-6694. 2) Bruce P.G. Solid State Ionics 2008; 179: 752-760. 3) Armand M., Tarascon J.-M., Nature 2008; 451: 652-657. 4) Scrosati B., Garche J., J. Power Sources 2010 ; 195 : 2419-2430. 5) Yuan X., Chao Y.-J., Ma Z.-F., Deng X., Electrochemistry Communications 2007 ; 9 : 2591-2595. 6) Zanto E.J., Ritter J.A., Popov B.N., Proceedings - Electrochemical Society 1999; 98-16: 71-8. 7) Job N., Théry A., Pirard R., Marien J., Kocon L., Rouzaud J., Béguin F., Pirard J. Carbon 2005; 43: 2481-2494. [less ▲]

Detailed reference viewed: 66 (2 ULg)
Peer Reviewed
See detailEffect of an anti-termite treatment on hindgut content metaproteome
Bauwens, Julien ULg; Fossépré, Marie; De Pauw, Edwin ULg et al

Conference (2014, July 16)

Introduction Termites are studied for many aspects of their biology. Historically known as pests in regard of human activities, these insects were more recently intensively investigated in the biofuel ... [more ▼]

Introduction Termites are studied for many aspects of their biology. Historically known as pests in regard of human activities, these insects were more recently intensively investigated in the biofuel context. Symbiotic interactions occurring along the termite gut are of particular interest for both of these scopes. In this study we compared hindgut metaproteome of termites fed with an anti-termite treatment and an untreated diet. Material & Methods Termites were fed with Whatman paper for 84 hours. For untreated and treated diet respectively, paper was moisten with water and a sub lethal suspension of tannins associated with boric acid (BAT). Termite hindgut content proteome was extracted and digested. Peptides were analyzed through nano-LC-ESI-MS/MS using an Orbitrap analyzer. Proteins identification was realized by Mascot search in a homemade termite protein sequences database. Non redundant peptides with a score above identity threshold were blasted against NCBI nr database and results of this blast were analyzed using MeGAn 5. Results High resolution mass spectrometry allowed identification of around 1500 and 1000 non redundant peptides respectively for water and ABT treatment. Peptides were parsed following their taxonomic and functional attribution in order to highlight differences in hindgut metabolism such as cellulose digestion or detoxification process. Identification of ubiquitous proteins also revealed differences in symbiotic populations balance. Conclusions Despite the sub lethal concentration for the anti-termite treatment, significant perturbation of hindgut metabolism was observed. Tannins are slightly repulsive for termites compared to boric acid alone, and this has to be taken in account. These results will be completed with biochemical assays, microscopic observations and 2D-DIGE MALDI-TOF/TOF experiment, analyzing potentially synergistic effect between boric acid and tannins. [less ▲]

Detailed reference viewed: 12 (3 ULg)
Peer Reviewed
See detailFrom variability to stability: The acquisition of phonemes in French speaking children aged 30 to 53 months.
MacLeod, Andrea; Maillart, Christelle ULg

Poster (2014, July 16)

When children first begin to produce the phonemes of their language, their productions are characterized by a high degree of variability (e.g., Ferguson & Farwell, 1975). As children’s phonological ... [more ▼]

When children first begin to produce the phonemes of their language, their productions are characterized by a high degree of variability (e.g., Ferguson & Farwell, 1975). As children’s phonological representations become more defined, their productions become more stable. In fact, the observation of variability beyond the early-word stage has been used as a diagnostic criteria for sub-types of phonological disorders (Dodd et al. 2005). Despite the clinical significance of phonological variability, there exists no normative data that can be used to objectively describe this variability in French. The goal of the present study was to describe variability and stability among French-speaking children between the ages of 30 and 53 months. A total of 153 children participated in the present study and were equally distributed in four groups (aged 30-35, 36-41, 42-47, and 48-53 months). We created a picture identification task with 65 target words, which contained the consonants of French in word initial, medial and final position. The children were asked to produce this series of words three times. Two measures of variability were used. (1) A consonant level analysis that investigated the stability of consonants regardless of word or syllable position. (2) A word level analysis that investigated the consistency of productions across the three series (Holm et al., 2007). The preliminary analysis focused on the consonant level analysis and revealed that the youngest group of children aged 30 to 35 months were significantly more variable than the oldest group aged 48-53 months. This shift from variability to stability will be discussed in terms of the development phonological representations. In addition, the clinical significance of variability will be discussed in light of these findings. [less ▲]

Detailed reference viewed: 29 (1 ULg)
Peer Reviewed
See detailMultinational Compagnies, Social Responsibility and Human Resource Manager
Robert, Jocelyne ULg; Goemans, Adeline; Delhez, Gauthier

Conference (2014, July 16)

Detailed reference viewed: 6 (1 ULg)
See detailLigand-independent Identification of orphan GPCR Signaling pathways
Dupuis, Nadine ULg

Conference (2014, July 16)

Detailed reference viewed: 10 (1 ULg)
Peer Reviewed
See detailModification of Conductivity, Superhydrophilicity and Photocatalytic Activity of TiO2 Thin Films Through Carbon Nanotubes Doping
Léonard, Géraldine ULg; Remy, Simon; Malengreaux, Charline ULg et al

Poster (2014, July 15)

In this work, a superhydrophilic and photocatalytic material allowing to reduce the accumulation of electrostatic charges is developed. The superhydrophilicity and photocatalytic activity of TiO2 films ... [more ▼]

In this work, a superhydrophilic and photocatalytic material allowing to reduce the accumulation of electrostatic charges is developed. The superhydrophilicity and photocatalytic activity of TiO2 films provide the “easy-to-clean” property. Indeed, superhydrophilicity induces a very low contact angle between TiO2 and water leading to the formation of a water film at the surface of the material. The photocatalytic activity, responsible for the pollutant decomposition, is explained by the excitation of the semiconductor under UV light leading to the formation of electron-hole pairs. The electrical conductivity of semiconductor TiO2 is very low leading to the accumulation of electrostatic charges and so the surface becomes a dust trap. Multi-walled carbon nanotubes (MWCNTs) are electrical conductors and their introduction in TiO2 could increase the conductivity. The incorporation of MWCNTs can modify the superhydrophilicity of TiO2. The photoactivity can be improved by reducing the electron-hole recombination rate. MWCNTs play a role in electron transfer and allow to decrease the recombination of electron-hole pairs. Two sol-gel syntheses were studied in alcohol and water respectively. In the alcoholic medium, monolayer films are obtained by dip-coating on alkaline free glass and calcined at 300, 400 or 500°C. The thermal treatment allows to crystallize TiO2 in the anatase form. In the aqueous synthesis, monolayer film are obtained by dip-coating on alkaline free glass. The TiO2 shows already the anatase structure. The characterizations of the samples have confirmed the nanotube presence in the aqueous synthesis, and in the alcoholic synthesis at 300°C and 400°C but not at 500°C. The highest conductivity is obtained from the syntheses in alcohol and the calcination at 300°C. That sample does not exhibit a high photoactivity because of its poor crystallinity. The films without MWCNTs are superhydrophilic but the contact angle increase with the incorporation of MWCNTs. The superhydrophilicity is lost with MWCNTs introduction. MWCNTs increase the roughness, the thickness and the electron transfer of the TiO2 matrix. This induces an enhancement of the photoactivity under UV. The comparison between the two syntheses shows that the alcoholic synthesis (400°C) is the best for pure film. When MWCNTs are introduced, the improvement is higher in the case of aqueous synthesis than in the case of alcoholic synthesis. The aqueous synthesis leads to more active photocatalysts than the alcoholic synthesis. [less ▲]

Detailed reference viewed: 25 (2 ULg)
Full Text
See detailNumerical modelling of mirror nozzle flow
De Cock, Nicolas ULg; Massinon, Mathieu ULg; Mercatoris, Benoît ULg et al

Conference (2014, July 15)

Detailed reference viewed: 65 (32 ULg)
Peer Reviewed
See detailDo tree species influence community structure and richness of Ammonia Oxidizing Bacteria at three temperate forest sites?
Malchair, Sandrine ULg; Carnol, Monique ULg

Poster (2014, July 15)

Introduction: The relationship between biodiversity and ecosystem function remains a controversial subject with numerous open questions. In Europe, the conversion of coniferous monocultures into ... [more ▼]

Introduction: The relationship between biodiversity and ecosystem function remains a controversial subject with numerous open questions. In Europe, the conversion of coniferous monocultures into broadleaved or mixed stand is considered to face ecological and economical risks posed by coniferous monocultures. Belowground effects of such a change in the dominant tree species is however largely unknown, although bacteria regulate many soil processes and some groups, like ammonia oxidizing bacteria (AOB) are highly sensitive to environmental stress. Objectives: The aims of this study were to investigate (i) AOB community structure and richness under several tree species, (ii) microbial/environmental factors related to AOB diversity, (iii) the relationship between AOB diversity and the nitrification process. Materials and methods: Forest floor (Of, Oh) was sampled under European beech, sessile oak, Norway spruce and Douglas fir at three sites. AOB community structure and richness was assessed by PCR-DGGE and sequencing. Samples were analysed for net N mineralization, potential nitrification, basal respiration, microbial biomass, microbial or metabolic quotient, pH, total nitrogen, extractable ammonium, organic matter content and exchangeable cations. Results: AOB community structure and tree species effects on AOB diversity were site-specific. Factors regulating ammonium availability, i.e. net N mineralization or microbial biomass, were related to AOB community structure. AOB richness was not related to nitrification. Conclusions: Our research revealed that, at larger spatial scales, site specific characteristics may be more important that tree species in determining AOB richness and community structure. Within sites, tree species influence AOB diversity. The absence of a relation between AOB richness and nitrification points to a possibly role of AOB abundance, phenotypic plasticity or the implication of ammonia oxidizing archaea in this process. [less ▲]

Detailed reference viewed: 32 (2 ULg)
Peer Reviewed
See detailAre expectancies and peers involved in the relation between depressive mood, anxiety and cannabis use in adolescence?
Schmits, Emilie ULg; Quertemont, Etienne ULg; Boulard, Aurore ULg

Poster (2014, July 15)

Background: Cannabis is the most commonly used illicit drug among teenagers and depression is one of the most common psychopathologies in adolescence. The specific symptom of depressive mood is present in ... [more ▼]

Background: Cannabis is the most commonly used illicit drug among teenagers and depression is one of the most common psychopathologies in adolescence. The specific symptom of depressive mood is present in 30% to 40% of adolescents in regular school settings. Links between cannabis use and depression have been highlighted, especially in adolescence. But questions remain about the strength of the association between lifetime cannabis use, depressive mood and anxiety, and about the mechanism underpinning the link. Aim: The aim of this study was to clarify the relationship between depressive mood and lifetime cannabis use in adolescents, particularly through the mediating role of anxiety and cannabis use effect expectancies, and the moderating role of peer cannabis use. Methods: A questionnaire was administered to 1,246 Belgian teenagers aged 16–17 years. ANOVA, chi-square, logistic regressions and mediation/moderation analyses were carried out to model lifetime cannabis use. Results: Depressive mood was positively correlated with lifetime cannabis use. Social anxiety, trait-anxiety and cognitive impairment effect expectancies mediated the effect of depression on lifetime cannabis use. The direct effect of depression on lifetime cannabis use increased when mediators were introduced into the relation, revealing their suppressive effects. The number of peer cannabis users moderated this model. Conclusion: Findings are discussed in terms of potential risk factors (depressive mood) or protective factors (anxiety and expectancies) for lifetime cannabis use, including the self-medication hypothesis. [less ▲]

Detailed reference viewed: 29 (8 ULg)
Peer Reviewed
See detailStudies of early interactions among infants aged 4 to 6 months furtherly diagnosed with autistic spectrum disorder and their developmental trajectories and outcome at 4 years old.
Boulard, Aurore ULg; Wolff, Marion; Morange-Majoux, Françoise et al

Poster (2014, July 14)

The purpose of this study is to observe and analyze the social skills of infants aged 4 to 6 months later diagnosed with autism. Through the family films collected, we compared 28 children later diagnosed ... [more ▼]

The purpose of this study is to observe and analyze the social skills of infants aged 4 to 6 months later diagnosed with autism. Through the family films collected, we compared 28 children later diagnosed with autism to 28 typically developing children strictly matched on chronological age and sex. To do this, we used the social behavior assessment scale (SBAS). This scale measures the behavior of the infant (turning his head, looking, smile, vocalize ...) in response to 5 parental stimuli (1.calling by her / his name, 2.saying peek-a-boo, a vocal sound 3.Producing , 4.filmed in silent 5.simultaneous interactions with one or more persons). Then we analyzed the responses behaviors of these children with the software "the observer". Results show evidence that, contrary to infants with typical development, infants later diagnosed as autistic made less visual contact, smile or vocalize less in response to parental stimuli. However, even if the responses of autistic children are statistically different in quantity (compared to the control group), responses to parental stimuli are still present. In a second step, we studied the developmental trajectories of children with autism. Our hypothesis was that children with a low score at the SBAS would have a lower global development score than the children with a high score at the SBAS at 3 years old. Our results validate our hypothesis. [less ▲]

Detailed reference viewed: 42 (3 ULg)
Full Text
See detailHigher Symmetries of the conformal Laplacian
Radoux, Fabian ULg

Conference (2014, July 14)

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailStudy of the specific interaction between Fluorescent PDMAEMA and human Platelets
Flebus, Luca ULg; Lombart, François ULg; Martinez, Lucia et al

Conference (2014, July 12)

Hemoreactivity of the poly (2-(dimethylamino) ethylmethacrylate) polymer (PDMAEMA) under a free form (thus not as a “PolyElectrolyte Complex”) was assessed. In order to facilitate the in vitro monitoring ... [more ▼]

Hemoreactivity of the poly (2-(dimethylamino) ethylmethacrylate) polymer (PDMAEMA) under a free form (thus not as a “PolyElectrolyte Complex”) was assessed. In order to facilitate the in vitro monitoring of this polycation and especially to follow its reactivity blood we have labeled it with fluorescein adopting a new chemical route of synthesis. Unexpectedly, using flow cytometry, this study showed a higher affinity of PDMAEMA for platelets than for red blood cells. [less ▲]

Detailed reference viewed: 15 (3 ULg)
Peer Reviewed
See detailCompeting One-Way Essential Complements : the Forgotten Side of the Net Neutrality Story
Broos, Sébastien ULg; Gautier, Axel ULg

Conference (2014, July 11)

We examine the incentives of an internet service provider (ISP) to break net neutrality by excluding internet applications competing with its own products, a typical example being the exclusion of VoIP ... [more ▼]

We examine the incentives of an internet service provider (ISP) to break net neutrality by excluding internet applications competing with its own products, a typical example being the exclusion of VoIP applications by a telecom company offering internet and voice services. We show that exclusion is not a concern when the ISP is a monopoly because it can extract the additional surplus created by the application through price rebalancing. By contrast, when ISP’s compete, in an attempt to differentiate, only one ISP will offer the app. Applying a no-exclusion rule in this case can lead to monopoly. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
See detailMicellization of PEO-b-polyphosphate for drug delivery applications
Vanslambrouck, Stéphanie ULg; Clément, Benoit; Riva, Raphaël ULg et al

Conference (2014, July 11)

Detailed reference viewed: 12 (1 ULg)
Peer Reviewed
See detailLiterature through Technology. Depicting the Future of the Book from Verne to Barjavel
Stienon, Valérie ULg

Conference (2014, July 10)

French futuristic novels tend to develop a wide range of representations regarding the book of the future as it is impacted by technical inventions, from the phone to the digital paradigm through ... [more ▼]

French futuristic novels tend to develop a wide range of representations regarding the book of the future as it is impacted by technical inventions, from the phone to the digital paradigm through photography and film: Albert Robida’s “phono-livre” (La Vie électrique, 1890), Octave Uzanne’s “storyographe” powered by electricity from the human body, Henri Allorge’s “bibliophone” (Le grand cataclysme, 1922), Léon Daudet’s “cinébiblat” and “cinélivre” (Le Napus, 1927), Maurice Renard’s telepathic book (Un homme chez les microbes, 1928) or even René Barjavel’s “télélecture” (Ravage, 1943) among others. It is well known that the historical antagonism between Science and the Humanities deeply influenced the disciplinary boundaries and the respective values of the two fields. But it also appears that such a disciplinary discussion does involve the issue of the material and tangible forms of the book considered as an object. Futuristic novels put a specific emphasis on the acoustic, visual and tactile avatars of the book within a sociocultural context characterized by the rise of Applied Sciences and media communication. Do these new media and formats compete with or complement to the former book patterns? Are such representations of the book as an audiovisual item some response to the predicted decline of the Humanities? Or are they rather a means of asserting the faith in a new forthcoming kind of literature? Although science may badly affect literature so as to produce an impoverishing mechanization of literary style (Jules Verne, Paris au XXe siècle, 1863), it also gives a valuable opportunity to create more ergonomic formats for a wider distribution and a more easily handheld book. Since the late 19th century until WWII, many futuristic novels propose to consider the book as it is located at the junction of Science and the Humanities rather than in their dichotomous opposition. Regarded as a specific leitmotiv, such a topic of technological and transmedia conversions of the book leads to reconsider the evolution of the identity paradigm of France as a “literary nation”. It also gives the opportunity to investigate the discrepancies and coincidences between the conjectural scope of these futuristic novels and the factual history of technological advances. [less ▲]

Detailed reference viewed: 15 (0 ULg)
Full Text
See detailOutils d’étude pour caractériser l’impact de l’ hydrodynamique sur la culture de cellules animales adhérentes cultivées sur microporteurs en bioréacteurs à cuve agitée
Collignon, Marie-Laure ULg

Conference (2014, July 10)

Cette présentation montre l'importance du choix des conditions d'agitation lors de la culture de cellules animales adhérentes sur microporteurs en bioréacteurs à cuve agitée. Elle montre des exemples d ... [more ▼]

Cette présentation montre l'importance du choix des conditions d'agitation lors de la culture de cellules animales adhérentes sur microporteurs en bioréacteurs à cuve agitée. Elle montre des exemples d'outils pour caractériser à l'échelle locale l'hydrodynamique au sein de ces bioréacteurs et une approche Euler-Lagrange qui a terme permettra de faire le lien entre l'hydrodynamique et la réponse cellulaire grâce à l'établissement de l'historique de conditions rencontrées localement par les cellules. [less ▲]

Detailed reference viewed: 15 (5 ULg)
See detailSupercritical CO2, impregnation to prepare drug-loaded implants: inpregantion of anti-inflammatory drugs into sutures
Champeau, Mathilde; Tassaing, Thierry; Thomassin, Jean-Michel ULg et al

Conference (2014, July 10)

Detailed reference viewed: 15 (4 ULg)
Full Text
See detail(Wrong) representations of physical activity, from definition to recommandations
Cloes, Marc ULg

Conference (2014, July 10)

Faisant partie intégrante de notre vie quotidienne, l’activité physique et la sédentarité constituent deux notions qui s’opposent dans la conception d’un style de vie sain. Les recherches actuelles ... [more ▼]

Faisant partie intégrante de notre vie quotidienne, l’activité physique et la sédentarité constituent deux notions qui s’opposent dans la conception d’un style de vie sain. Les recherches actuelles montrent que chacune d’elles devrait faire l’objet d’une attention particulière. Toutefois, qu’ils fassent partie du grand public ou appartiennent à des professions liées à la santé, il apparait que les individus ne construisent pas toujours des représentations adéquates à propos des bonnes habitudes de vie. Dans la perspective d’influencer favorablement la culture des citoyens en matière d’activité physique, il s’avère donc nécessaire de rappeler régulièrement les informations clés qui devraient être retenues et appliquées dans la vie de tous les jours. Afin d’illustrer la manière avec laquelle les représentations peuvent constituer le fil rouge d’un processus amenant les gens à adopter un style de vie physiquement actif et peu sédentaire, nous passerons brièvement en revue la définition de l’activité physique, l’identification de ses effets et les recommandations proposées actuellement par les agences de santé publique. Nous utiliserons différentes approches ludiques originales, susceptibles de faire vivre aux participants des expériences visant à stimuler le traitement des informations et à privilégier leur rétention. Au niveau de la définition de l’activité physique, l’objectif consistera à faire ressortir les différentes dimensions de l’activité physique. Puisque les recherches les plus récentes en soulignent l’incidence de plus en plus marquée, nous insisterons également sur la distinction entre les différents niveaux d’intensité de la pratique. Ensuite, une classification des effets bénéfiques de l’activité physique sera proposée avant une révision des recommandations internationales. Les modalités de présentation originales qui seront mises en place stimuleront la prise de conscience de certaines mauvaises représentations, courantes dans le public. La dernière partie de l’exposé consistera à illustrer les contre-arguments à opposer à ceux qui ne sont pas encore convaincus qu’ils pourraient bouger davantage. [less ▲]

Detailed reference viewed: 20 (0 ULg)
Full Text
Peer Reviewed
See detailSelf broadening coefficients and improved line intensities for the n7 band of C2H4 near 10.5 mm, and impact on ethylene retrievals from Jungfraujoch solar spectra
Vander Auwera, Jean; Fayt, André; Tudorie, Marcela et al

Poster (2014, July 10)

Ethylene (ethene, C2H4) is a tropospheric pollutant on the Earth, also present as a by-product of methane photochemistry in the atmosphere of outer solar system bodies. Remote sensing of ethylene in the ... [more ▼]

Ethylene (ethene, C2H4) is a tropospheric pollutant on the Earth, also present as a by-product of methane photochemistry in the atmosphere of outer solar system bodies. Remote sensing of ethylene in the infrared range relies on the 10 mm region. This spectral range corresponds to the excitation of 7 modes of vibration of 12C2H4, 4 of which being infrared active (see Fig. 1 of [1]). The corresponding n10, n7, n4 and n12 bands are located near 826, 949, 1026 and 1442 cm-1, respectively [1]. Among these, the n7 band is the strongest, indeed used for remote sensing measurements of ethylene. Relying on high-resolution Fourier transform infrared (FTIR) spectra recorded in Brussels, the present work involved extensive measurements of individual line intensities and self broadening coefficients for the n7 band of 12C2H4. Compared to the corresponding information available in the latest edition of the HITRAN spectroscopic database (HITRAN 2012 [2]), the measured line intensities were found to be higher by about 10 % for high J lines in the P branch and lower by about 5 % for high J lines of the R branch, varying between these two limits roughly linearly with the line positions. Test calculations performed in this work indicated that these discrepancies could result from the relative values of the transition moments of the n10, n7 and n12 bands used when the information provided in HITRAN was generated (the transition moment of the n4 band was set to zero). The measured self broadening coefficients exhibit a dependence on both J and Ka, which was modeled empirically. The spectroscopic information for ethylene available in HITRAN 2012 was modified to match the present observations. The impact of these modifications on retrievals of atmospheric ethylene was then evaluated via FTIR retrievals in the 949.0 – 952.0 cm-1 microwindow, from a subset of ground-based high-resolution FTIR solar spectra recorded at the Jungfraujoch station. The new line intensities were found to lead to a reduction of the measured total columns of ethylene by -4.1±0.1 %, compared to the use of HITRAN 2012. [less ▲]

Detailed reference viewed: 17 (2 ULg)
Full Text
See detailSynthesis of degradable polyphosphoester copolymers for templating calcium carbonate drug delivery carriers
Ergül, Zeynep ULg; Debuigne, Antoine ULg; Calvignac, Brice et al

Conference (2014, July 09)

Degradable acid bearing polyphosphoester (PPE) copolymers were prepared by combination of organocatalyzed ring opening polymerization and click chemistry. Their solution behavior and ability to complex ... [more ▼]

Degradable acid bearing polyphosphoester (PPE) copolymers were prepared by combination of organocatalyzed ring opening polymerization and click chemistry. Their solution behavior and ability to complex calcium ions were studied as well as their capacity to template CaCO3 particles dedicated to drug delivery. [less ▲]

Detailed reference viewed: 22 (7 ULg)
Full Text
See detailLarge-scale stochastic optimization using non-stationary geostatistics for uncertainty assessment of groundwater flow and solute transport, in the framework of a near surface radioactive waste disposal
Rogiers, Bart; Laloy, E.; Gedeon, Matej et al

Poster (2014, July 09)

Uncertainty quantification is very much needed to support decision making related to e.g. environmental impact assessment for waste disposal sites. A probabilistic result provides a much stronger basis ... [more ▼]

Uncertainty quantification is very much needed to support decision making related to e.g. environmental impact assessment for waste disposal sites. A probabilistic result provides a much stronger basis for decision making compared to a single deterministic outcome. Accurate posterior exploration of high-dimensional and CPU-intensive models, which are often used for environmental impact assessment, is however a challenging task. To quantify the uncertainty associated with solute transport in the framework of a near surface radioactive waste disposal in Mol/Dessel, Belgium, we investigate combining the adaptive Metropolis (AM) McMC algorithm for updating the global model parameters, and adaptive spatial resampling (ASR) for updating of the spatially distributed model parameters, by block sampling. The forward model used is a groundwater flow model conditioned on borehole and direct push data, that accounts for non-stationary heterogeneity in hydraulic conductivity. The obtained flow solutions are used for solute transport simulations, and the results are compared with a different groundwater flow model parameterization, that makes use of homogeneous hydrogeological layers. Moreover, a number of simulations is performed to assess the effect of realistic dispersivity, which is derived from outcrop investigations. The obtained results indicate that the combination of AM and ASR using block sampling seems not to be very efficient for McMC sampling with the forward model used in this study. However, using the algorithm in optimization mode seems to work fine, and provides an alternate way for exploring the parameter space and the prediction uncertainty. [less ▲]

Detailed reference viewed: 19 (0 ULg)
Full Text
Peer Reviewed
See detailWhich links exist between depression, engagement in activities’ level and several psychological processes?
Wagener, Aurélie ULg; Blairy, Sylvie ULg

Poster (2014, July 09)

In Europe, depression affects 33.4 millions of people every year. According to the World Health Organization, depression will be the leading cause of disabilities in 2030. This highlights the need for ... [more ▼]

In Europe, depression affects 33.4 millions of people every year. According to the World Health Organization, depression will be the leading cause of disabilities in 2030. This highlights the need for available, effective and efficient treatments of this psychopathology. In order to offer such treatments, there is a need for a deep understanding of depression’s mechanisms. Depression is characterized by a decrease of the level of engagement in activities: for instance, depressed patients stay in bed, don’t see friends, don’t go out anymore and can be on sick leave for a long period of time. Reciprocally, this decrease maintains depressive symptoms. This link between depression and level of engagement in activities is well-established in the scientific literature. However, no study has, until yet, determined which psychological processes are mediators of this link. Therefore, this study’s aim is to determine these psychological processes. In order to reach this aim, 500 subjects, suffering from psychopathology or not, will fulfill a set of questionnaires. These questionnaires will assess mood (anxiety and depression), level of engagement in activities and five categories of psychological processes that have been selected from different theoretical models of depression (self-image, environmental satisfaction, negative repetitive thoughts, experiential avoidance and emotional regulation). Statistical analysis will be performed in order to confirm a LISREL model. Data collection is ongoing and results will be presented and discussed during the congress. [less ▲]

Detailed reference viewed: 19 (2 ULg)
See detailApproximation algorithms for multi-dimensional vector assignment problems
Crama, Yves ULg

Conference (2014, July 09)

Detailed reference viewed: 6 (0 ULg)
Full Text
See detailApplication of multiple-point geostatistics on groundwater flow and transport in media with complex geological heterogeneity: lessons learnt and remaining challenges
Huysmans, Marijke; Dassargues, Alain ULg

in Proceedings (2014, July 09)

Multiple-point geostatistics has been increasingly applied on groundwater problems in the last ten years. Several case studies have been published indicating simulating realistic geological heterogeneity ... [more ▼]

Multiple-point geostatistics has been increasingly applied on groundwater problems in the last ten years. Several case studies have been published indicating simulating realistic geological heterogeneity using multiple-point geostatistics can significantly improve groundwater flow and solute transport predictions. There are however several remaining challenges when applying multiple-point geostatistics to groundwater problems often suffering from data scarcity. These challenges might be the reason why multiple-point has been used to a much lesser extent by practitioners than by researchers. This paper gives an overview of the current challenges and discusses new advancements to overcome them. The following questions will be discussed: How to obtain 3D training images? Can the representativity of the used training image be validated ? How sensitive are groundwater calculations to the selection of the training image? Is it worth incorporating fine scale geological heterogeneity in groundwater problems or are other features (boundary conditions, data uncertainty/quality, …) more important for improving predictions? How can multiple-point geostatistics be used without suffering from very long computation times for the numerical models? Is overparametrization of groundwater models an issue ? What are the practical obstacles to apply multiple-point geostatistics by groundwater practitioners? [less ▲]

Detailed reference viewed: 16 (2 ULg)
Peer Reviewed
See detailA longitudinal perspective of alcohol use among adolescents: the predictive role of peers and internalizing factors.
Schmits, Emilie ULg; Glowacz, Fabienne ULg; Quertemont, Etienne ULg

Poster (2014, July 09)

Alcohol is the most commonly used psychoactive substance among teenagers. Consumption is influenced by environmental factors and personal characteristics, events or experiences. High use can lead to ... [more ▼]

Alcohol is the most commonly used psychoactive substance among teenagers. Consumption is influenced by environmental factors and personal characteristics, events or experiences. High use can lead to substantial problems, especially after an early consumption. Detecting and preventing an increase of alcohol use among teenagers, through the identification of risk and protective factors, seems essential in terms of public health. This study aimed to examine the progression of use in young teenagers, to identify protective and risk factors of alcohol use (including peers and internalizing factors) and to specifically focus on the influence of social anxiety. A questionnaire was administered twice to 877 teenagers (49.94% female, M=15.61) with one year interval (T1 and T2). Sex, age, alcohol use, number of friends, social comparison, trait-anxiety, social anxiety and depression were assessed through validated scales. T-test for paired sample and hierarchical regressions were performed. During the follow-up year, the average alcohol use significantly increased. A positive social comparison at T1 significantly predicted alcohol use at T2. The more teenagers positively compared themselves to their friends and felt popular, the more they consume alcohol. A similar significant effect was demonstrated for depression. The more young people manifested depressive affects at T1, the more they used alcohol at T2. However, social anxiety significantly protected from this substance use. More social anxiety at T1 was associated with less alcohol consumption at T2. The number of friends and trait-anxiety at T1 did not significantly influence alcohol use at T2. A positive social comparison and depressive affects could be considered as risk factors, whereas social anxiety could be defined as protective factor. At this developmental period, young people suffering from social anxiety symptoms subsequently use less alcohol, maybe due to the lack of contact with this substance usually socially consumed, whereas more popular and integrated teenagers are more at risk. The present results challenge the tension-reduction model according to which alcohol is consumed to reduce anxious affects and to facilitate social relationships. However, results suggest that alcohol might be used to reduce unpleasant depressive affects. [less ▲]

Detailed reference viewed: 30 (4 ULg)
Peer Reviewed
See detailThe consumption of pornography and sexuality during adolescence : between exploratory behaviour and risks of deviant behaviour
Glowacz, Fabienne ULg; Puglia, Rosa ULg

Conference (2014, July 09)

Pornographic consumption or exposure to sexually explicit media (SEM) during adolescence raises many questions, in particular concerning its incidence on the level of a teenager's psychosexual development ... [more ▼]

Pornographic consumption or exposure to sexually explicit media (SEM) during adolescence raises many questions, in particular concerning its incidence on the level of a teenager's psychosexual development and sexual behaviour. Adolescence is a stage of identity formation, characterized by the adoption of risk taking and exploratory behaviours, of which the consumption of pornography is part. Whereas some studies noticed an impact of the exposure to sexually explicit media on the level of the subject's psychosexual development, attitudes towards sexuality and sexual behaviour, other studies do not highlight any significant links between the voluntary or involuntary exposure to pornography and risk taking sexual behaviours. Two researches will be presented to deal with this question. The first study, relating to a sample of 319 teenagers aged between 15 to 18 (52% boys), shows that 85% of the subjects have already seen pornographic material, the average age a child first views pornography being between 10 and 14. Our results indicate that the forms of exposure to SEM as well as the representations of pornography and the impact of pornographic material on their sexuality are different depending on the subject's gender. Our second study, relating to a sample of 47 juvenile sexual offenders, will make it possible to consider the forms of consumption of these young people and the possible links between their sexual offence and the consumption of pornography. [less ▲]

Detailed reference viewed: 36 (7 ULg)
Full Text
Peer Reviewed
See detailDu processus aux soins intégrés : expérience de gestion de projet bottom-up
ERPICUM, Marie ULg; BASSLEER, Bernard ULg; Defraigne, Jean-Olivier ULg et al

Conference (2014, July 08)

Implementation of blood conservation strategies is a current issue in a public health view, especially in cardiac surgery. A service project has been initiated in the cardiovascular department of the CHU ... [more ▼]

Implementation of blood conservation strategies is a current issue in a public health view, especially in cardiac surgery. A service project has been initiated in the cardiovascular department of the CHU of Liege aiming to develop a blood conservation program. This project has evolved into the creation of a clinical pathway of the cardiac surgery patient and then into an institutional model for the development of other clinical pathways. This evolution leads to meet with the missions and strategic objectives of the Institution and some national projects. The process of this approach weaves a horizontal and vertical grid. The multidisciplinary membership, supported by medical and nursing leadership and the institutional support, will determine the sustainability of this project. [less ▲]

Detailed reference viewed: 36 (12 ULg)
Full Text
Peer Reviewed
See detailAnalyse des facteurs de perception du risque de mauvaise localisation de la tumeur par les travailleurs dans un service de radiothérapie
Kamto Kenmogne, Marius ULg

Conference (2014, July 08)

A la suite des scandales médicaux de Toulouse et d’Epinal, la sécurité des soins en radiothérapie a connu un intérêt croissant. En même temps qu’une réglementation plus exigeante est émise, des méthodes ... [more ▼]

A la suite des scandales médicaux de Toulouse et d’Epinal, la sécurité des soins en radiothérapie a connu un intérêt croissant. En même temps qu’une réglementation plus exigeante est émise, des méthodes de gestion de risques issues de l’industrie sont expérimentées et les résultats des expériences publiés. Toutefois, ces méthodes sont souvent basées sur des hypothèses à priori sur le comportement humain et aucune n’analyse spécifiquement comment les risques sont évalués par les divers acteurs et groupes d’acteurs intervenant dans le processus de prise en charge du patient. Le présent article fournit les résultats d’une étude empirique analysant les facteurs psychologiques expliquant les différences de perception du risque de mauvaise localisation par les travailleurs d’un service de radiothérapie. Il démontre que les médecins qualifiés d’experts minimisent ce risque en s’appuyant d’une part sur leur connaissance de la fréquence de réalisation du risque et des conséquences pour le patient et d’autre part sur leur expérience et leurs compétences pour le prévenir et le réduire. Le personnel d’administration qualifié de profane ne s’estime pas concerné par ce risque. Bien que beaucoup le considèrent comme élevé, ils n’ont pas d’avis sur les différents facteurs de perception proposés dans le cadre d’analyse de Slovic. [less ▲]

Detailed reference viewed: 10 (2 ULg)
Full Text
See detailL'hôpital, une entreprise comme les autres ? Oui, mais ...
Van Caillie, Didier ULg

Conference (2014, July 07)

A l’instar d’une entreprise industrielle, l’hôpital actuel présente les caractéristiques suivantes, quel que soit son statut ou sa localisation : Il est constitué d’un ensemble de ressources rares et ... [more ▼]

A l’instar d’une entreprise industrielle, l’hôpital actuel présente les caractéristiques suivantes, quel que soit son statut ou sa localisation : Il est constitué d’un ensemble de ressources rares et limitées, de nature humaines, techniques, financières et immatérielles (savoirs et connaissances), dont il doit justifier d’une utilisation efficiente (en clair, maximiser le rapport output/coût) en regard des attentes diverses et parfois contradictoires de ses différentes parties prenantes (patients, collaborateurs, autorités de financement, autorités de contrôle) s’il veut remplir le rôle de création de valeur sociétale naturellement dévolu à toute organisation. En terme managérial, son défi quotidien est de : Gérer de manière coordonnée des flux multiples (flux des patients physiques, objets des soins ; flux des médicaments et des traitements, nécessaires à la fluidité du flux des patients ; flux d’information, traduction virtuelle des patients physiques nécessaire lui aussi à la fluidité du flux des patients) dans un souci permanent d’efficience multiple : garantir le bon soin au bon patient au bon moment avec l’information suffisante, les médicaments et l’infrastructure adéquate, le tout, au moindre coût. Simultanément, coordonner en permanence l’ensemble des ressources humaines, matérielles et financières de l’organisation, et surtout motiver la principale ressource critique, l’ensemble des collaborateurs (corps médical, corps infirmier, corps technicien de support, corps de support à la gestion), en résolvant de manière continue les défis quotidiens d’une bonne communication interpersonnelle (dans et entre les services), d’une motivation individuelle alignée sur les besoins et les attentes de l’organisation et d’une parfaite coordination avec les attentes du patient. [less ▲]

Detailed reference viewed: 73 (10 ULg)
Full Text
See detailTaking Cadaveric Decomposition Chemistry out of Flatland
Stefanuto, Pierre-Hugues ULg; Perrault, K; Stadler, S et al

Conference (2014, July 07)

Detailed reference viewed: 40 (2 ULg)
Full Text
Peer Reviewed
See detailNouvelle stratégie opérationnelle aux urgences : le Triage infirmier avancé.
JOBE, Jérôme ULg

Conference (2014, July 07)

Confronté au problème de surpopulation, conséquence de leur fréquentation sans cesse croissante, les services d’urgence ont mis en place des stratégies opérationnelles basées sur des filières de soins ... [more ▼]

Confronté au problème de surpopulation, conséquence de leur fréquentation sans cesse croissante, les services d’urgence ont mis en place des stratégies opérationnelles basées sur des filières de soins organisées au départ de systèmes de triage des patients. Pareils outils ont démontrés leur intérêt mais s’avèrent aujourd’hui insuffisant, raison pour laquelle de nouvelles stratégies voient le jour. Un d’elle, le triage infirmier avancé, permettant à un infirmier d’initier la démarche diagnostique juste après la catégorisation du patient, semble être une promesse d’avenir. Une étude portant sur un triage infirmier avancé pour les patients se présentant pour une douleur thoracique a été menée récemment au CHU de Liège. Les résultats encourageant de cette étude révèlent un gain de temps dans la prise en charge des patients en faveur de ce nouveau système et une durée totale de séjour aux urgences réduites, principalement en période de surpopulation. Il se confirme donc que le triage infirmier avancé, couplé à un triage classique, particulièrement en période de surpopulation, améliore la prise en charge des patients en terme de temps et réduit le temps total de séjour aux urgences combattant par là la surpopulation. [less ▲]

Detailed reference viewed: 19 (0 ULg)
Full Text
Peer Reviewed
See detailInfluence of players' level on racket speed and ball accuracy in the tennis serve
Tubez, François ULg; Croisier, Jean-Louis ULg; Cordonnier, Caroline ULg et al

Conference (2014, July 06)

INTRODUCTION Serve in modern tennis game is an important offensive weapon for players (1-2). In kinematic analysis, serve is the most studied stroke of this game. The aim of our study was to compare the ... [more ▼]

INTRODUCTION Serve in modern tennis game is an important offensive weapon for players (1-2). In kinematic analysis, serve is the most studied stroke of this game. The aim of our study was to compare the performance of two specific populations: international players versus national players. In particular, racket speed at impact and accuracy of ball were assessed. METHODS A tennis court was reconstructed in a motion analysis laboratory. The position of the racket was evaluated in 3D at a frequency rate of 200 Hz. Tests were performed on 6 professional players (international level) and 9 non-professional players (national level). Each of them served 25 trials in direction of the “T” area of deuce diagonal. Two squares of 1m² and 2 m² respectively were delimited on the corner of the serve square. The instruction for both groups was to serve in the “T” area with the highest ball speed and minimal ball rotation (flat serve). RESULTS Although the forward speed of the racket at impact was identical between the two groups of players (International 36.35 ± 2.37 m/s and national 36.37 ± 2.90 m/s, p-value 0,991), the accuracy and consistency of serves on the target area is better for international players group (1m² area: International 33% ± 7% and national 14% ± 12%, p-value 0.0053; 2m² area (including 1m² area): International 71% ± 8% and national 54% ± 12%, p-value 0.0096; Out of zone: International 29% ± 8% and national 46% ± 12%, p-value 0.014). DISCUSSION High-velocity ball seems to be a key factor for serve performance (3). It is known that there is a relationship between racket speed and ball velocity (4). Both groups have high racket speed. However, international players serve with better accuracy and consistency than national players. We hypothesize that these differences are due to capacity of international players to adapt to a particular environment. Moreover, international players could give priority to consistency over velocity. We conclude that high-velocity serve is not a sufficient criterion to perform at international level; consistency and accuracy are two important factors to reach this level. [less ▲]

Detailed reference viewed: 81 (25 ULg)
Full Text
See detailLe roi Léopold et la Commission nationale des sciences
Pirot, Pascal ULg

Conference (2014, July 05)

Detailed reference viewed: 10 (2 ULg)
Full Text
See detailIslands as reference stations for environmental studies: the case of Calvi Bay in Corsica
Abadie, Arnaud ULg; Gobert, Sylvie ULg; Lejeune, Pierre

Conference (2014, July 05)

Islands are subject to human activities and their impacts on land and marine ecosystems. They are also often isolated from some of the continental influences but on the other hand different kind of human ... [more ▼]

Islands are subject to human activities and their impacts on land and marine ecosystems. They are also often isolated from some of the continental influences but on the other hand different kind of human activities can be concentrated in small areas. These characteristics make possible the management of many programs that use whole islands, or some of their parts, as a reference station for environmental studies. From this perspective, the program STARE-CAPMED has begun in 2012 at STARESO, an oceanographic research station established at Calvi Bay (Corsica) since the early 70’s. It aims to create a reference station for the study of emerging local and global anthropogenic impacts on marine pristine ecosystems. Several universities are involved in this project and provide their expertise in various fields of marine sciences. This program provides a precise view of the environmental processes that occur, which are strongly linked with economic and cultural issues. [less ▲]

Detailed reference viewed: 22 (1 ULg)
Full Text
Peer Reviewed
See detailImportance of quantitative return-to-field criteria
Schwartz, Cédric ULg; Cordonnier, Caroline ULg; Lehance, Cédric ULg et al

Conference (2014, July 04)

Detailed reference viewed: 23 (2 ULg)
See detailHMA4 and metal hyperaccumulation in Arabidopsis halleri
Hanikenne, Marc ULg

Conference (2014, July 04)

Detailed reference viewed: 14 (0 ULg)
Peer Reviewed
See detail"Muette d'émotion. La Diva recomposée"
Belloi, Livio ULg

Conference (2014, July 04)

Cette communication s'attache à étudier les résurgences de la diva dans le cinéma expérimental contemporain, en particulier dans "Diva Dolorosa" (Peter Delpeut, 1999) et dans "Film ist." (Gustav Deutsch ... [more ▼]

Cette communication s'attache à étudier les résurgences de la diva dans le cinéma expérimental contemporain, en particulier dans "Diva Dolorosa" (Peter Delpeut, 1999) et dans "Film ist." (Gustav Deutsch, 2002). [less ▲]

Detailed reference viewed: 6 (0 ULg)
Full Text
See detailLet's Talk Ambiguity: Citizen science in new and emerging technologies
Van Oudheusden, Michiel ULg

Conference (2014, July 04)

Citizen science (CS) is a fairly new concept that is rapidly gaining traction in the industrialized democratic world. Although it is often likened to public participation in science, CS takes on many ... [more ▼]

Citizen science (CS) is a fairly new concept that is rapidly gaining traction in the industrialized democratic world. Although it is often likened to public participation in science, CS takes on many forms and orientations. In this presentation, I link CS developments and practices to the advent of new and emerging technologies (NEST), such as bio- and nanotechnologies. I draw on three Flemish cases of CS linked to NEST to illustrate how CS co-evolves with Flemish and European policy shifts towards responsible innovation governance. The cases serve to highlight how various conceptions of CS enact divergent rationales for public involvement in science and promote competing visions of the volatile relationship between science and society. The clash of CS perspectives within and through NEST produces a highly ambiguous innovation context that is simultaneously characterized by excitement and (pre)caution; public and formal expertise; policy dictates and public dialogue; and deterministic and constructionist views of innovation. How implicated actors (policymakers, scientists, citizens, and other stakeholders) make sense of, and deal with, these ambiguities is one of the key challenges CS faces today. [less ▲]

Detailed reference viewed: 86 (1 ULg)
See detailThe Belgian Monuments Men During and After the Second World War
Houbart, Claudine ULg

Conference (2014, July 04)

Detailed reference viewed: 30 (0 ULg)
Full Text
See detail"Faire voir par l'histoire" : l'usage du passé contre Mazarin durant la Fronde
Saal, Caroline ULg

Conference (2014, July 04)

Detailed reference viewed: 15 (2 ULg)
Full Text
Peer Reviewed
See detailThe emergence of hybrids: Imprinting from the entrepreneurial team heterogeneity
Dufays, Frédéric ULg; Huybrechts, Benjamin ULg

Conference (2014, July 03)

This conceptual paper deals with the emergence of hybrids by developing a process model that crosses levels of analysis. It aims to explain how heterogeneity in an entrepreneurial team may translate into ... [more ▼]

This conceptual paper deals with the emergence of hybrids by developing a process model that crosses levels of analysis. It aims to explain how heterogeneity in an entrepreneurial team may translate into the creation of a hybrid organization. [less ▲]

Detailed reference viewed: 28 (2 ULg)
Full Text
Peer Reviewed
See detailLa verbalisation: un outil performant permettant une amélioration de l'estime de soi? Analyse de cas chez des arbitres de basket-ball
Van Hoye, Martin ULg; Cloes, Marc ULg

Poster (2014, July 03)

L’estime de soi représente une dimension importante de notre personnalité, notamment chez les adolescents, souvent poussés par un important besoin de se montrer compétents en toute situation. Notre ... [more ▼]

L’estime de soi représente une dimension importante de notre personnalité, notamment chez les adolescents, souvent poussés par un important besoin de se montrer compétents en toute situation. Notre objectif consistait à améliorer l’estime de soi de jeunes arbitres de basket-ball (n=22) à l’aide d’une verbalisation d’après match. Nous avons comparé les résultats obtenus entre un groupe expérimental et un groupe contrôle. A l’issue de cette étude, nous n’avons observé aucun changement chez les sujets du groupe contrôle. Par ailleurs, une légère amélioration non-significative a été observée dans le groupe expérimental (+1,2/40). D’autre part, d’autres analyses nous permettent de conclure que l’utilisation de la verbalisation a bel et bien été bénéfique aux sujets expérimentaux. Nous pensons que ces arbitres réfléchiraient plus spontanément sur leur prestation. Ceci pourrait les aider à progresser, aussi bien en tant qu’arbitre qu’en tant qu’individu à proprement parler. Indirectement, cela les aiderait à augmenter leur estime de soi. [less ▲]

Detailed reference viewed: 21 (3 ULg)
Full Text
Peer Reviewed
See detailComparaison du niveau d’estime de soi dans deux populations ayant des caractéristiques démographiques différentes : des arbitres et des non-arbitres
Van Hoye, Martin ULg; Cloes, Marc ULg

Poster (2014, July 03)

Si le sport forge le caractère, l’arbitrage devrait également responsabiliser les individus qui l’exercent. Aussi, on peut considérer que les arbitres pourraient développer une meilleure estime d’eux ... [more ▼]

Si le sport forge le caractère, l’arbitrage devrait également responsabiliser les individus qui l’exercent. Aussi, on peut considérer que les arbitres pourraient développer une meilleure estime d’eux-mêmes ? Dans cette recherche, nous avons tenté de vérifier cette hypothèse en analysant le niveau d’estime de soi de deux échantillons distincts : des arbitres de basket-ball (n=163) et des personnes n’ayant aucune expérience au niveau de l’arbitrage (n=163). L’instrument que nous avons utilisé est « l’Echelle de l’Estime de Soi » (EES). La moyenne générale au questionnaire est légèrement supérieure chez les arbitres (30,9 vs 30,5) mais il ne s’agit pas d’une différence significative (p=0,8372). L’ancienneté dans l’arbitrage ou l’âge des individus ne semblent pas être un facteur influençant l’estime de soi des arbitres. Il conviendrait de vérifier s’il en est de même dans les autres disciplines sportives que le basket-ball. [less ▲]

Detailed reference viewed: 21 (7 ULg)
Full Text
Peer Reviewed
See detailEvaluation des effets à court terme de l’intervention « Bouger plus » sur la pratique d’activité physique des seniors
Rompen, Jérôme ULg; Mouton, Alexandre ULg; Grimont, Pierre et al

Poster (2014, July 03)

Des outils basés sur un site internet sont efficaces pour promouvoir l’activité physique (AP) chez les seniors (Ammann et al., 2013). Cette étude avait pour but d’évaluer les effets de l’intervention « ... [more ▼]

Des outils basés sur un site internet sont efficaces pour promouvoir l’activité physique (AP) chez les seniors (Ammann et al., 2013). Cette étude avait pour but d’évaluer les effets de l’intervention « Bouger plus » sur la pratique d'AP de sujets de 50 ans et plus, au sein d’une commune. Quatre groupes ont reçu une intervention différente pendant trois mois : un site internet (I), un cours collectif (CC), une combinaison des deux (CCI) et pas d'intervention (CO). Des questionnaires ont permis d’évaluer les résultats. Ceux-ci montrent une évolution positive du stade de changement de comportement vis-à-vis de l’AP, au cours de l’intervention, pour les groupes I et CCI. De plus, le niveau de pratique est resté stable malgré la période hivernale pour les groupes CC et CCI alors qu’il a chuté pour le groupe CO. L’intervention a donc eu des effets positifs à court terme sur les comportements en matière d’AP, particulièrement quand le site internet et les cours collectifs étaient combinés. [less ▲]

Detailed reference viewed: 25 (14 ULg)
Full Text
Peer Reviewed
See detailAnalyse qualitative du fonctionnement du centre de formation d’une fédération sportive
Lacrosse, Zoé ULg; Martin, Valentine; Cloes, Marc ULg

Poster (2014, July 03)

Cette étude qualitative analyse le fonctionnement d’un centre de formation pour jeunes athlètes de haut niveau dont la finalité consiste à leur permettre de mener conjointement leurs études et leur ... [more ▼]

Cette étude qualitative analyse le fonctionnement d’un centre de formation pour jeunes athlètes de haut niveau dont la finalité consiste à leur permettre de mener conjointement leurs études et leur carrière sportives. Dans la perspective d’aider la structure à améliorer ce qui est mis en place, notre objectif consiste à décrire la situation actuelle. D’un point de vue pratique, nous avons interrogé les dirigeants (n=4) du centre, les sportifs (n=34), leurs parents (n=10), les coaches (n=3) ainsi que plusieurs intervenants externes (médecin, directeur d’école, etc. ; n = 3). Nous avons également réalisé un certain nombre d’observations informelles et collecté des questionnaires permettant de faire émerger le ressenti des joueurs quant à leur vie au sein du centre. Les résultats indiquent (a) un manque de suivi diététique et psychologique, (b) des relations relativement bonnes entre les acteurs sauf entre les joueurs et les éducateurs et, (c) la nécessité d’améliorer les infrastructures. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
Peer Reviewed
See detailEvaluation des effets à court terme de l’intervention « Bougerplus » sur les connaissances en matière d’activité physique des seniors
Mouton, Alexandre ULg; Rompen, Jérôme ULg; Cloes, Marc ULg

Poster (2014, July 03)

La littérature actuelle suggère qu’une meilleure connaissance en matière d’AP encouragerait à l’adoption d’un style de vie plus actif. L’objectif principal de cette étude était d’identifier les effets de ... [more ▼]

La littérature actuelle suggère qu’une meilleure connaissance en matière d’AP encouragerait à l’adoption d’un style de vie plus actif. L’objectif principal de cette étude était d’identifier les effets de trois interventions différentes sur la connaissance en matière d’AP chez les seniors d’une commune francophone belge. D’une durée de 3 mois, l’intervention se composait d’un site internet et d’un cours collectif. Quatre groupes de seniors provenant de la même commune ont été formés : contrôle (C), Internet (I), cours collectif (CC) et combiné (CCI). Des questionnaires ont été complétés par les participants avant l’intervention (T0), après l’intervention (T1) et après deux mois de suivi (T2). Une évolution significative des connaissances en matière d’AP a été constatée pour les groupe CCI et CC entre T0 et T2. L’intervention combinant un cours collectif ainsi qu’un outil Internet semble la plus efficace pour améliorer à court-terme les connaissances en matière d’AP chez les seniors. [less ▲]

Detailed reference viewed: 21 (8 ULg)
See detailLa Carte des Sols de la Belgique : un héritage à se réapproprier
Legrain, Xavier ULg; Michel, Brieuc ULg; Bock, Laurent ULg et al

Conference (2014, July 03)

Une cartographie systématique à grande échelle des sols de Belgique a été conduite entre 1947 et 1991. Les observations étaient effectuées au moyen de sondages à la tarière jusqu’à une profondeur standard ... [more ▼]

Une cartographie systématique à grande échelle des sols de Belgique a été conduite entre 1947 et 1991. Les observations étaient effectuées au moyen de sondages à la tarière jusqu’à une profondeur standard de 125 cm dans la mesure du possible, avec une densité moyenne de 2 sondages à l’hectare. Des plans cadastraux au 1/5 000 ont servi à noter les observations et à tracer les limites des plages cartographiques, généralisées par la suite par transcription sur fond de carte topographique au 1/10 000. La carte finale a été publiée par planchettes à l’échelle du 1/20 000, associées à des livrets explicatifs. La carte s’appuie sur une légende originale, basée majoritairement sur des critères morphologiques du sol, aisément identifiables sur le terrain, objectifs (sans a priori d’interprétation) et les plus permanents possibles. La combinaison de ces critères, transcrits en symboles alphanumériques, est à l’origine de la très grande richesse sémantique de la légende, forte de plus de 10 000 unités cartographiques de sols. La numérisation de la Carte des Sols de la Belgique et la structuration de l’information délivrée par la légende ont ouvert de nombreuses perspectives en terme d’applications. Mais au-delà du produit final qu’est la carte, le véritable héritage légué est l’extraordinaire connaissance experte accumulée par les cartographes durant la durée du projet. Si une part inestimable de ce savoir s’en est allée en même temps qu’eux, une part tangible est accessible à travers de nombreuses publications (livrets explicatifs, monographies, thèses, articles) ou parsème divers documents d’archive (notes de terrain, PV de réunion, rapports d’excursions). Ces derniers sont également une invitation à se replonger dans le contexte historique, scientifique et philosophique de l’époque des levés. Ils permettent de ce fait de mieux cerner la manière dont la légende a été pensée, élaborée, adaptée, remaniée. L’éclairage que ces publications et documents d’archive donnent sur la carte et sa légende laisse entrevoir une richesse d’information insoupçonnée. Se la réapproprier par une interprétation avertie de la carte est essentiel préalablement à toute valorisation. Cette communication se propose de justifier l’intérêt de cette démarche au travers de multiples exemples. Ils ont été choisis de manière (i) à présenter la diversité des cas rencontrés et (ii) à illustrer l’impact d’une telle interprétation sur la qualité des produits issus de 2 projets menés actuellement : la corrélation de la légende de la Carte des Sols de la Belgique avec le système de classification international World Reference Base et la contribution belge au projet mondial GlobalSoilMap. [less ▲]

Detailed reference viewed: 14 (4 ULg)
Full Text
Peer Reviewed
See detailEtude de la notoriété des sportifs belges francophones de haut niveau
THEUNISSEN, Catherine ULg; Danse, Nicolas; Cloes, Marc ULg

Poster (2014, July 03)

L’objectif de cette étude est d’analyser la notoriété des sportifs belges francophones de haut niveau ainsi que l'image de la population à leur égard. Pour obtenir ces informations, nous avons choisi ... [more ▼]

L’objectif de cette étude est d’analyser la notoriété des sportifs belges francophones de haut niveau ainsi que l'image de la population à leur égard. Pour obtenir ces informations, nous avons choisi d’interroger un échantillon représentatif de 400 sujets ayant fait l’objet d’une sélection aléatoire basée sur des critères sociodémographiques. Le questionnaire, soumis par téléphone et en face-à-face, porte sur la notoriété spontanée et assistée ainsi que sur l'image des sportifs. Il a été élaboré avec l'aide d'un expert en marketing. Après analyses, nous pouvons classer les sportifs en termes de notoriété. Nous constatons également que certains sont perçus comme de véritables héros tandis que d'autres véhiculent plutôt une image négative. Ces informations s’avèrent cruciales pour les sportifs et leurs entraîneurs dans le sens où à un taux de notoriété élevée et une image positive s’associent plus aisément sponsors pendant la pratique et contrat de reconversion en fin de parcours. [less ▲]

Detailed reference viewed: 26 (4 ULg)
Full Text
Peer Reviewed
See detailMICROPHYSIQUE DES NUAGES ET RAYONNEMENT SOLAIRE : COMPARAISON DES MESURES IN SITU AU MONT RIGI EN HAUTE BELGIQUE ET DES DONNÉES CLOUD PHYSICAL PROPERTIES (CPP) OBTENUES À PARTIR DES IMAGES METEOSAT-9
Beaumet, Julien ULg; Clerbaux, Nicolas; Cornet, Yves ULg et al

in Camberlin, Pierre; Richard, Yves (Eds.) Actes du XXVIIe Colloque de l'Association Internationale de Climatologie : CLIMAT : SYSTÈME & INTERACTIONS (2014, July 02)

Le rayonnement solaire global mesuré au mont Rigi a été comparé à l'épaisseur optique des nuages (COT) estimée à l'aide des données SEVIRI. Une relation logarithmique avec un coefficient de détermination ... [more ▼]

Le rayonnement solaire global mesuré au mont Rigi a été comparé à l'épaisseur optique des nuages (COT) estimée à l'aide des données SEVIRI. Une relation logarithmique avec un coefficient de détermination d'environ 0,5 a été trouvée. Ce résultat plutôt faible peut en grande partie s'expliquer par un nombre limité de cas où subsistent des erreurs de positionnement ou par des interactions plus complexes entre nébulosité et rayonnement. De plus, l'incertitude sur l'estimation de l'épaisseur optique des nuages à l'aide des données SEVIRI pour les nuages optiquement plus épais n'est pas négligeable. [less ▲]

Detailed reference viewed: 25 (1 ULg)
Full Text
Peer Reviewed
See detailComparaison entre le profil vertical de la vitesse du vent observé dans les basses couches de la troposphère et celui simulé par le modèle WRF en Belgique
Doutreloup, Sébastien ULg; Fettweis, Xavier ULg; Beaumet, Julien ULg et al

in Camberlin, Pierre; Richard, Yves (Eds.) Actes du XXVIIe Colloque de l'Association Internationale de Climatologie : CLIMAT : SYSTÈME & INTERACTIONS (2014, July 02)

In the framework of FLEXIPAC project funded by the "RELIABLE" program of Walloon Region (Belgium), the Laboratory of Climatology Topoclimatology (LCT) of the University of Liège (Belgium) aims to adjust ... [more ▼]

In the framework of FLEXIPAC project funded by the "RELIABLE" program of Walloon Region (Belgium), the Laboratory of Climatology Topoclimatology (LCT) of the University of Liège (Belgium) aims to adjust the WRF regional model (v.3.4.) forced by the ERA-Interim reanalysis for Belgium. Our analysis shows that wind speeds at 100m simulated by WRF are systematically overestimated compared to wind speeds extracted from wind productions of two wind farms. In order to solve this problem, four ways are considered in this contribution. The first way is to compare the WRF model with the reanalysis data. The second way is to test the influence of the spatial resolution by running WRF with a finer resolution. The third way is to smooth WRF outputs, where in order to analyze the variability created by the model. And finally, the fourth way is to compare the WRF model with the MAR (v3.3.) regional model. This last way seems to confirm that the MAR model better simulates wind speeds at 10m and at 100m than the WRF model. [less ▲]

Detailed reference viewed: 32 (3 ULg)
Full Text
Peer Reviewed
See detailMolecular adaptations in mouse skeletal muscle following eccentrically versus concentrically biased training
Hody, Stéphanie ULg; Lacrosse, Zoé ULg; Simonet, Arnaud et al

Poster (2014, July 02)

Introduction The molecular adaptations specifically induced by different muscle contraction types have only been partially elucidated. We previously demonstrated that eccentric contractions in human ... [more ▼]

Introduction The molecular adaptations specifically induced by different muscle contraction types have only been partially elucidated. We previously demonstrated that eccentric contractions in human quadriceps elicited proteome modifications that suggest a muscle fiber typology adaptation (Hody et al. 2011). We address this question in a more systematic way by examining the effects of different running modes on the mouse muscle proteome and the muscle fiber typology on the whole quadriceps. Methods Male adult mice (C57BL6) were randomly divided into downhill running (DHR, quadricipital eccentrically biased contractions), uphill running (UHR, quadricipital concentrically biased contractions) and untrained control (CONT) groups. Running groups performed five training sessions on an inclined treadmill for 75 to 135 min/day and the quadriceps muscles were dissected 96 hours after the last session. Muscle protein extracts of DHR and UHR groups (n=4/group) were subjected to a 2D-DIGE analysis coupled with mass spectrometry. The assessment of fiber type, size and number was performed on the rectus femoris of the three groups (n=6/group) using myosin heavy chain (MHC) immunofluorescence. Results In the proteomic analysis, eight spots identified as the fast MHC isoforms exhibited a lower abundance in DHR compared to UHR (p<0.05, t-test). In contrast, ATP synthase subunit a and tubulin ß were more expressed in DHR (p<0.05). Immunohistological analysis revealed a significant higher proportion of type I and IIa fibers for DHR compared to UHR or CONT groups (p<0.05, one-way ANOVA). Discussion Our data demonstrate that the eccentrically biased contractions in mice induced specific adaptations in protein expression as well as in muscle fiber type and size which may reflect a more oxidative muscle phenotype. The differences in stress placed on the muscle between both trainings may be responsible for some unique adaptations resulting from the eccentrically biased training. Eccentric training is known to protect skeletal muscles against exercise-induced muscle damage (EIMD) which may occur after intense eccentric contractions (Chen et al. 2010; Hody et al. 2011). It is also suggested that fast glycolytic muscle fibers are more vulnerable to EIMD than oxidative fibers (Lieber and Friden, 1988). Therefore, it would be interesting to investigate whether the molecular changes induced by an eccentrically biased training are involved in protection against EIMD. References Chen TC, Chen HL, Lin MJ, Wu CJ, Nosaka K. (2010). Med Sci Sports Exerc 42, 1004-1012. Hody S, Leprince P, Sergeant K, Renaut J, Croisier JL, Wang F, Rogister B. (2011). Med Sci Sports Exerc 43, 2281-2296. Lieber RL, Friden J. (1988). Acta Physiol Scand 133, 587-588. [less ▲]

Detailed reference viewed: 22 (4 ULg)
Full Text
Peer Reviewed
See detailAnalyse de l’efficacité de l’accoutumance à l’eau chez l’enfant préscolaire
Mornard, Manhattan ULg; Jidovtseff, Boris ULg; Deflandre, Dorian ULg et al

Conference (2014, July 02)

Beaucoup d’enfants suivent des cours d’accoutumance à l’eau et différentes approches existent. Cette étude vise à comparer deux de ces méthodes et d’en vérifier l’efficacité. Nous avons soumis à trois ... [more ▼]

Beaucoup d’enfants suivent des cours d’accoutumance à l’eau et différentes approches existent. Cette étude vise à comparer deux de ces méthodes et d’en vérifier l’efficacité. Nous avons soumis à trois groupes d’enfants une batterie de tests complète. Vingt-cinq enfants bénéficiaient d’une méthode traditionnelle (TRADITION), 25 autres de la méthode CEReKi (CEREKI) et les 27 derniers ne suivaient aucun cours (CONTRÔLE). Tous ont été testés avant et après une période de cinq mois. L’approche pédagogique des deux écoles a été analysée durant 13 séances filmées. On observe une amélioration linéaire du niveau d’accoutumance à l’eau des enfants en fonction de leur âge qu’ils suivent ou non des cours. Les résultats démontrent l’efficacité des deux écoles. Les enfants CEREKI semblent s’améliorer autant mais en moins de séances. Cela peut être dû à un meilleur temps d’engagement moteur. La méthode CEREKI s’avère donc très efficace, même dans une piscine peu adaptée. [less ▲]

Detailed reference viewed: 34 (8 ULg)
Full Text
See detailAre agricultural ecosystems important BVOC « exchangers »? Evidences from 2 measurement years on croplands at Lonzée (Belgium)
Bachy, Aurélie ULg; Aubinet, Marc ULg; Schoon, Niels et al

Poster (2014, July 01)

For the last decades, agricultural ecosystems have been a key biome for diverse socio-economical, environmental and climatic issues. And one of these climatic issues is just BVOC (Biogenic Volatile ... [more ▼]

For the last decades, agricultural ecosystems have been a key biome for diverse socio-economical, environmental and climatic issues. And one of these climatic issues is just BVOC (Biogenic Volatile Organic Compounds) emission from terrestrial ecosystems. Indeed, those compounds which are mostly emitted by plants play a great role in the atmospheric chemistry, thereby influencing the Earth surface radiative budget and the tropospheric air quality. However, so far, very few is known about BVOC exchange by crops, implying that huge uncertainties remain about qualifying, quantifying and determining sources/sinks and driving mechanisms of BVOC exchanges between croplands ecosystems and the atmosphere. We present here the first long term BVOC fluxes measurement study conducted on maize (2012) and winter wheat (2013), respectively the second and first most important worldwide crops (FAOSTAT). BVOC exchange was measured using the disjunct by mass scanning eddy covariance technique (+ PTR-MS, Ionicon) at the Lonzée Terrestrial Observatory (ICOS site) in Belgium. Main results are: (i) crops emit mainly methanol; (ii) BVOC fluxes from studied crops is lower than in literature, suggesting that agricultural ecosystems are poor BVOC exchangers; (iii) soil is a significant BVOC source. [less ▲]

Detailed reference viewed: 15 (3 ULg)
See detailX-ray emission from magnetic massive stars
Nazé, Yaël ULg; Petit, V.; Rindbrand, M. et al

Poster (2014, July 01)

Magnetically confined winds of early-type stars are expected to be sources of bright and hard X-rays. In an attempt to clarify the systematics of the observed X-ray properties, we have analyzed a large ... [more ▼]

Magnetically confined winds of early-type stars are expected to be sources of bright and hard X-rays. In an attempt to clarify the systematics of the observed X-ray properties, we have analyzed a large series of Chandra and XMM observations, corresponding to over 100 exposures of 60% of the known magnetic massive stars listed recently by Petit et al. (2013). We notably show that the X-ray luminosity is strongly correlated with mass-loss rate, in agreement with predictions of magnetically confined wind models. We also investigated the behavior of other X-ray properties (plasma temperature, absorption, variability), yielding additional constraints on models. This work not only advances our knowledge of the X-ray emission of massive stars, but also suggests new observational and theoretical avenues to further explore magnetically confined winds. [less ▲]

Detailed reference viewed: 9 (0 ULg)
Full Text
See detailConstraints on the summer-to-winter transport from SPICAM/MEX nitric oxide observations
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Gagné, M.-E. et al

Conference (2014, July 01)

Detailed reference viewed: 2 (0 ULg)
Full Text
See detailDiurnal thermosphere scale height from MEX/SPICAM grazing limb data
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Bougher, S et al

Conference (2014, July 01)

Detailed reference viewed: 3 (0 ULg)
See detailThe X-ray bright massive stars in Cyg OB2
Nazé, Yaël ULg; Cazorla, Constantin ULg; Rauw, Grégor ULg

Poster (2014, July 01)

As a complement to the results from the Cyg OB2 Chandra Legacy program, we present in this contribution the detailed analysis of the four X-ray bright massive stars dominating the cluster. Cyg OB2 #5, #8A ... [more ▼]

As a complement to the results from the Cyg OB2 Chandra Legacy program, we present in this contribution the detailed analysis of the four X-ray bright massive stars dominating the cluster. Cyg OB2 #5, #8A, and #9 are binary or multiple massive stars in the Cyg OB2 association displaying several peculiarities, such as bright X-ray emission and non-thermal radio emission. Our X-ray monitoring of these stars reveals the details of their behavior at high energies, which can be directly linked to wind-wind collisions (WWCs). In addition, the X-ray emission of Cyg OB2 #12, an evolved massive star, shows a long-term decrease, which could hint at the presence of a companion (with associated colliding winds) or indicate the return to quiescence of the system following a recent eruption. [less ▲]

Detailed reference viewed: 13 (5 ULg)
See detailSpatiotemporal distribution of last 500 yrs turbidites in the Western Gulf of Corinth, Greece: implications for the characterization of historical earthquakes
Beckers, Arnaud ULg; Hubert, Aurelia ULg; Beck, Christian et al

Poster (2014, July 01)

The Corinth rift is one of the fastest spreading rifts on Earth. 10 earthquakes of magnitude greater than 6 occurred during the last century. The question of seismic hazard is consequently particularly ... [more ▼]

The Corinth rift is one of the fastest spreading rifts on Earth. 10 earthquakes of magnitude greater than 6 occurred during the last century. The question of seismic hazard is consequently particularly relevant. Despite a long earthquake catalogue, estimations of earthquake hazard remain problematic because of the difficulty to associate each historical event to one of the many active faults mapped in the area. Consequently, combining seismology, history and paleoseismology in an interdisciplinary approach is here necessary and is the goal of the ANR-SISCOR project. In this framework, we investigated the offshore sediments in order to (1) better constraint the length of the active offshore faults, and (2) look for sedimentary signature of historical earthquakes. 600 km of high resolution seismic reflexion data have been acquired during two surveys and 12 short gravity cores have been retrieved. The latters are 0.5 to 1 m long, allowing us to analyze about 500 yrs of sedimentation. Two new faults potentially able to trigger M>5.5 earthquakes have been mapped in the northern part of the gulf based on seismic data. Sedimentary events (turbidites sensu lato) have been identified in some cores, essentially in the deep basin and in a 180m-deep sub-basin close to the northern coast. The comparison with the critically reviewed historical records shows that some of these events could have been triggered by historical earthquakes. The link between these potential earthquakes sedimentary signatures, historical events and active faults is discussed based on intensity maps and our new active fault map. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
See detailSynthesis of Pt/Carbon Xerogel Electrocatalysts for Proton Exchange Membrane Fuel Cells (PEMFC): Effect of the Reduction Procedure
Zubiaur, Anthony ULg; Chatenet, Marian; Maillard, Frédéric et al

Conference (2014, July)

Detailed reference viewed: 31 (3 ULg)
Full Text
Peer Reviewed
See detailGalectin-3: a new promising cardiac biomarker in sports endurance?
LE GOFF, Caroline ULg; Devaux, Séverine; BREVERS, Eric ULg et al

in Cardiovascular Research (2014, July), 103(Supplement 1), 255

Detailed reference viewed: 20 (7 ULg)
Full Text
Peer Reviewed
See detail3D MODELING OF SHEAR STRESS DEVELOPMENT DURING NEOTISSUE GROWTH IN A PERFUSION BIOREACTOR
Guyot, Yann ULg; Papantoniou, Ioannis; Schrooten, Jan et al

Conference (2014, July)

Detailed reference viewed: 16 (3 ULg)
Full Text
Peer Reviewed
See detail3D analysis and determination of stride parameters for different type of foot strike in running
Deflandre, Dorian ULg; Bury, Thierry ULg; Schwartz, Cédric ULg et al

Poster (2014, July)

The purpose of the study was to compare methods for the determination of foot strike and toe off for runners with different foot strike patterns. A 3D optoelectronic system usually used in motion ... [more ▼]

The purpose of the study was to compare methods for the determination of foot strike and toe off for runners with different foot strike patterns. A 3D optoelectronic system usually used in motion laboratories was compared with tools commonly used on the field: an optical based detection system (OptoGait) and an accelerometer based system (Myotest). [less ▲]

Detailed reference viewed: 39 (7 ULg)
Full Text
Peer Reviewed
See detailValidation of a new automatic drowsiness quantification system for drivers
Wertz, Jérôme ULg; François, Clémentine ULg; Verly, Jacques ULg

Poster (2014, July)

Drowsiness is a major cause of various types of accidents, and particularly of driving accidents. Scientific studies report that drowsiness would be responsible for 20 to 30% of driving accidents ... [more ▼]

Drowsiness is a major cause of various types of accidents, and particularly of driving accidents. Scientific studies report that drowsiness would be responsible for 20 to 30% of driving accidents. Drowsiness can result from, among others, sleep deprivation, sleep disorders, alcohol, some medications, or performing a monotonous task. While all persons are likely to be drowsy at some point during the day, some persons are more prone than others to being drowsy at almost any time of the day; e.g. 6 to 11% of the population suffers from severe chronic excessive daytime sleepiness. Three main classes of methods can be used to characterize the level of drowsiness of a driver without disturbing him. These classes are respectively related to vehicle behavior (e.g. via lateral movements), driver behavior (e.g. via steering wheel movements), and driver physiological state (e.g. via eye movements). Since drowsiness is a physiological state, it seems particularly meaningful to use physiology-based methods to characterize it. Among these, the most significant ones rely on polysomnography and/or oculography. Polysomnography is viewed by some practitioners as the reference in the domain, but it is very sensitive to artifacts, and it is not very practical for use while driving. Ocular parameters are recognized to be good and reliable physiological indicators of drowsiness, and, thus, oculography seems to be the most sensible way to characterize drowsiness in practice. We have thus developed an experimental, fully automatic drowsiness monitoring system (software/algorithms) based on the physiological state of a person. This system uses ocular parameters extracted from images of the eye (i.e. photooculography) to determine a level of drowsiness on a continuous numerical scale from 0 to 10, with 0 corresponding to "very awake" (or "very vigilant") and 10 to "very drowsy". The ultimate goal of this system is to prevent drowsiness-related accidents for driving and other applications. The reported study shows that our system exhibits promising capability for road safety. Fourteen healthy volunteers (7 M, 7 F, mean age 23.7, range 21-33 years) participated in an experiment in a driving simulator, where they were asked to perform three driving sessions/runs (two of 45 minutes and one of 60 minutes) in different sleep-deprivation conditions (with up to 28 hours of complete sleep deprivation). During each session, we recorded both a high frame rate video of one eye and a set of driving parameters. Subsequently, for each successive minute in the session, we used our algorithms to extract ocular parameters from the video images and to produce a level of drowsiness, and we computed the standard deviation of lateral position (SDLP) from the driving parameters. The results show (1) that the (computed) SDLP increases when the (computed) level of drowsiness increases, and (2) that the level of drowsiness increases when the level of sleep deprivation increases. These results indicate that our algorithms for producing a level of drowsiness work in a meaningful way. The experiment protocol was approved by the Ethics Committee of our university. [less ▲]

Detailed reference viewed: 67 (15 ULg)
Full Text
Peer Reviewed
See detailOn the convergence of relaxation schemes to couple phasor-mode and electromagnetic transients simulations
Plumier, Frédéric ULg; Geuzaine, Christophe ULg; Van Cutsem, Thierry ULg

in Proceedings of the IEEE PES General Meeting (2014, July)

Hybrid simulations combining phasor-mode and electromagnetic transients models aim at taking advantage of computational speed of the former and accuracy of the latter. For simulation accuracy, a ... [more ▼]

Hybrid simulations combining phasor-mode and electromagnetic transients models aim at taking advantage of computational speed of the former and accuracy of the latter. For simulation accuracy, a relaxation process is used, which consists of iterating between both models. The convergence properties of this relaxation process are investigated. The speed of convergence is assessed when the variables exchanged at the interface between both models are respectively pure voltage/current sources, Norton/Thévenin equivalents, or a combination of them. Iteratively updated Norton/Thévenin equivalents are shown to drastically reduce the number of relaxation iterations. [less ▲]

Detailed reference viewed: 91 (29 ULg)
See detailA parent-implemented language intervention in lower socioeconomic status populations
Martinez Perez, Trecy ULg; Leclercq, Anne-Lise ULg; Mulquet, Amandine et al

Poster (2014, July)

Detailed reference viewed: 18 (2 ULg)
Peer Reviewed
See detailRecollection and familiarity in normal and pathological aging
Bastin, Christine ULg

Conference (2014, July)

Detailed reference viewed: 17 (2 ULg)
Full Text
Peer Reviewed
See detailEnhancement of ray tracing method for radiative heat transfer with new isocell quasi-monte carlo technique and application to EUI space instrument
Jacques, Lionel ULg; Masset, Luc ULg; Kerschen, Gaëtan ULg

in Proceedings of the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, HEFAT2014 (2014, July)

Monte Carlo ray tracing method for thermal analysis. The rationale for this research is the speed-up of radiative heat transfer computation with the Finite Element Method, widely used in mechanical ... [more ▼]

Monte Carlo ray tracing method for thermal analysis. The rationale for this research is the speed-up of radiative heat transfer computation with the Finite Element Method, widely used in mechanical engineering especially for space structure design but not yet often for thermal analysis of these structures. Based on Nusselt’s analogy, the ray direction sampling is done by sampling the unit disc to derive the ray directions. Stratified sampling is applied to the unit disc that is divided into cells or strata into which random points are generated. The isocell method relies on cells that have the particularity of presenting almost the same area and shape. This enhances the uniformity of the generated quasi-random sequence of ray directions and leads to faster convergence. The isocell method is associated with different surface sampling to derive REFs. The method is benchmarked against ESARAD, the standard ray tracing engine of the thermal analysis software used in the European aerospace industry. Various geometries are used. In particular, one entrance baffle of the Extreme Ultraviolet Imager (EUI) instrument developed at the Centre Spatial de Liège in Belgium is presented. The EUI instrument of the Solar Orbiter European Space Agency mission and will be launched in a 0.28 perihelion orbit around the Sun in 2018. [less ▲]

Detailed reference viewed: 25 (3 ULg)
See detailTassili n’Ajjer (Sahara Oriental Algérien) – Résultats préliminaires sur le Silurien-Dévonien
Djouder, Hocine ULg; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in Journée Thématique de l’Association des Sédimentologistes Français (ASF) « Diagenèse : avancées récentes et perspectives » (2014, July)

Les gisements atypiques non-conventionnels, à roches sédimentaires faiblement perméables, ainsi que les « sources rocks » constituent une source pétrolière majeure, attirant de plus en plus l’industrie ... [more ▼]

Les gisements atypiques non-conventionnels, à roches sédimentaires faiblement perméables, ainsi que les « sources rocks » constituent une source pétrolière majeure, attirant de plus en plus l’industrie pétrolière, d’où un regain d’intérêt potentiel au sein du Bassin de Berkine. En effet, rien que les argiles radioactives (‘hot’) shales du Silurien sont à l’origine de 80 à 90% des hydrocarbures de la plaque Nord-africaine, et les argiles radioactives du Frasnien (source secondaire) avec des valeurs de TOC allant jusqu’à 14% (Lüning et al., 2000). L'objectif de la thèse s’agira dans un premier temps de l’analyse des diagraphies de forages (Berkine ‘subsurface’) conditionnée aux données de terrain (Tassili n’Ajjer sur affleurements) et de sismique réflexion. Ceci afin de réaliser la modélisation 2D et 3-D des corps réservoirs et de la roche mère, à l’aide du logiciel Petrel©. Et au final, la cartographie des unités de la série Silurien-Dévonien dans le but de définir les « Plays » potentielles aux futures plans d’exploration. Au second volet, la mise au point d’une méthodologie rigoureuse, permettant l’étude minéralogique et l’évolution diagénétique des faciès, sous différents aspect ; la quantification de la porosité, la définition des relations entre porosité et minéralogie. Ensuite caractériser les argiles radioactives du Llandoverien-Frasnien respectivement Silurien, Dévonien et minéraux associés (Lüning et al., 2004). Plus précisément les processus et mécanismes qui contrôlent les transformations des minéraux argileux (minéralogies et cristallochimies) en composante latérale mais aussi en fonction de la profondeur. Dans ce contexte, des missions de terrains seront entreprises dans les massifs du Fadnoun (Tassili Central), Oued Taïni, Oued Khabkhab ainsi que dans l’Oued Amassine (Tassili Occidental) qui nous permettront de décrire en surface les formations du Siluro-Dévonien (profondément étudiées par : Asses, A., 1987 - Massa, D., 1988 - Bekkouche, D., 1992 – IFP, Sonatrach, Beicip., 1999) qui renferment les argiles radioactives (‘hot’) shales et les niveaux réservoirs, situées à quelques centaines de kilomètres au Nord (Bassin de Berkine), sous 2500 à 3000 m de sédiments. Une première mission de terrain est déjà réalisée, ayant reçu un support financier de la R&D (Séjour de Recherche à l’étranger), ainsi que des facilitées administratives et logistiques respectivement du Ministère de la Culture et de l’office national du parc culturel du Tassili n’Ajjer (patrimoine mondial de l’UNESCO depuis 1982). D’autres missions ultérieures seront à organiser en fonction du planning du déroulement de la thèse. La première mission géologique de terrain a duré un mois sur le Plateau de Fadnoun (Tassili n’Ajjer central). Ceci dans différentes coupes géologique-type des affleurements du Silurien-Dévonien : l’Oued Imihrou, l’Oued Farzal, Gara Tihouririne (sur la route Illizi-Fort Tarat) et Isoutar (Djouder et al., 2014). Durant cette mission terrain nous avons pu assurer la concordance entre les thématiques et objectifs de départ et les réalisés sur terrain, entre autre : 1) la meilleure compréhension de la géométrie des corps sédimentaires, au sein du Plateau de Fadnoun et donc par extension dans le bassin ; 2) la description et l’analyse des faciès, grâce aux affleurements peu connus dans les oueds. Ils permettront une analyse, notamment en termes d’environnements sédimentaires, des formations du Silurien-Dévonien ; 3) application première dans son genre de la susceptibilité magnétique comme nouvel proxy, pour les corrélations lithostratigraphiques des unités du Silurien-Dévonien aux Tassilis. 4) réalisation d’un échantillonnage serré à différents niveaux pour couvrir tout l’intervalle de la dépression intra-Tassilienne et des Grès du Tassili Externe, et puis l’expédition du matériel, nécessaire aux analyses de laboratoires notamment à Liège, et collaborateurs. La confection de lames-minces (en cours) permettra l’étude de la minéralogie et de la pétrographie, et donc une meilleure compréhension des faciès et microfaciès, c’est à dire de leurs propriétés intrinsèques (systèmes hétérogènes et complexes). Les lames palynologiques permettront des datations précises de chaque niveau. Enfin, différentes analyses sur roche (minéraux argileux dans un Laboratoire partenaire de l’Université de Poitiers en France, susceptibilité magnétique, cathodoluminescence, analyses géochimiques des majeurs et des traces à l’ULg) permettront d’affiner les paramètres du paléoenvironnement (Da Silva et al., 2013). [less ▲]

Detailed reference viewed: 55 (27 ULg)
Full Text
See detailOptimization Of A Heat Pump For Satellite Cooling
Bell, Ian ULg; Lemort, Vincent

in 15 th International Refrigeration and Air Conditioning Conference at Purdue (2014, July)

Detailed reference viewed: 20 (4 ULg)
Full Text
Peer Reviewed
See detailMovements of endemic and exotic fish in a large river ecosystem (Rhône, France)
Capra, Hervé; Pella, Hervé; Ovidio, Michaël ULg

in Proceedings of the 10th International Conference on Ecohydraulics (2014, July)

The aim of this study is to characterise the mobility templates of two patrimonial species of rheophilic cyprinids (Barbus barbus and Squalius cephalus) and of a species of exotic fish, the catfish ... [more ▼]

The aim of this study is to characterise the mobility templates of two patrimonial species of rheophilic cyprinids (Barbus barbus and Squalius cephalus) and of a species of exotic fish, the catfish (Silurus glanis), in an area of the upper Rhône River characterised by significant disruptions of flow and thermal regimes (caused by hydroelectric and nuclear power plants). Results reveal contrasted mobility patterns, habitat uses and home-range sizes between endemic and exogenous fish species, but with a high interindividual variability. [less ▲]

Detailed reference viewed: 17 (6 ULg)
See detailFascination as a Case of Action at a Distance in Early Modern Science
Dubouclez, Olivier ULg

Conference (2014, July)

BUCHAREST-PRINCETON SEMINAR IN EARLY MODERN PHILOSOPHY 14th Edition Organized by the Research Centre for the Foundations of Modern Thought (FME), University of Bucharest, in collaboration with the ... [more ▼]

BUCHAREST-PRINCETON SEMINAR IN EARLY MODERN PHILOSOPHY 14th Edition Organized by the Research Centre for the Foundations of Modern Thought (FME), University of Bucharest, in collaboration with the Philosophy Department at Princeton University 8 – 13 July 2014 Bran, Romania De rerum natura: Naturalism, Super-naturalism, Unnaturalism Invited speakers include: Daniel Garber (Princeton University), Roger Ariew (University of South Florida), Igor Agostini (Università del Salento), Peter Anstey (University of Sydney), Olivier Dubouclez (Université de Liège), Tamás Pavlovits (University of Szeged), Jennifer Rampling (Princeton) Description : https://ci3.googleusercontent.com/proxy/8CBWEZYl_gju-O0mEKjDNw0Eh_qIbYUu1oZBKfZqOypmLO1gU9NfBBUnKK5HrwoN-VKG8iQn_PvQpZDlbxq0IwVL9dQOy_HcGJ0=s0-d-e1-ft#https://mail.google.com/mail/u/0/images/cleardot.gif Some Seventeenth Century authors gave a new definition of nature, clearly articulated in terms of natural laws and of their dependence on God. Even if some elder tensions, coming from the Stoic and Epicurean heritage, were thus released, new challenges appeared, related to the limits of nature (is the world finite or infinite?), the structure of matter, the status of the mind and the status of the human being with respect to nature. While some philosophers as Bruno, Telesio and Cardano tried to reach a compromise with Renaissance vitalism, promoting a natural magic and a new alchemy, some others, such Bacon, Descartes, Spinoza, Leibniz, proposed radical different paths. Not losing sight of the manner in which ancient thought (Pliny and Lucretius seem to be naturally summoned) informed modern debate over nature, the seminar will try to uncover a period in which Spinoza could articulate his critique of Descartes as holding a view of man as "imperium in imperio". The Bucharest-Princeton Seminar in Early Modern Philosophy is an international annual meeting of scholars interested in various aspects of early modern thought. The aim of the seminar is to create a stimulating environment for discussing papers and ideas. It includes workshops in the morning and presentations of papers in the afternoon, where participants can present work in progress. While the morning sessions will focus on the theme of “De rerum natura: Naturalism, Super-naturalism, Unnaturalism,” the afternoon sessions seek to give participants an opportunity to discuss their own special interests with an open and sympathetic audience of students and scholars with broad interests in early modern thought. Throughout we try to maintain a balance between the high scholarly level and the informal friendly spirit of a colloquium. The Seminar will take place in Bran, a small mountain resort near Brasov, in Transylvania. It will be hosted in a small, friendly Bed and Breakfast (single or double rooms). The participation fee is 150 EUR for faculty and 90 EUR for students (covering accommodation with breakfast). We invite applications for contributions (from researchers) and for attendance (from students). If you want to contribute a paper, please send a CV and a one-page abstract, and if you want to attend, a CV and a letter of intent – by April 20 – to Vlad Alexandrescu (valexandrescu@gmail.com), Dana Jalobeanu (dana.jalobeanu@celfis.ro). [less ▲]

Detailed reference viewed: 32 (3 ULg)
Full Text
Peer Reviewed
See detailWhich are the determinants of homeownership ? A logit analysis for the case of Belgium
Xhignesse, Guillaume ULg; Bianchet, Bruno ULg; Cools, Mario ULg et al

Conference (2014, July)

In market-oriented economies, high rates of homeowners are traditionally associated with positive economic effects and externalities. For this reason, public authorities have encouraged homeownership for ... [more ▼]

In market-oriented economies, high rates of homeowners are traditionally associated with positive economic effects and externalities. For this reason, public authorities have encouraged homeownership for the last decades through taxation or subsidies policies. In Belgium, owner-occupation has been promoted since the end of the nineteenth century and homeownership policy is considered as a key element of the Welfare state. Furthermore, the effectiveness of these policies is fundamentally based on a clear understanding of what determines homeownership. Therefore, the analysis of tenure determinants can provide inputs for the definition or the renewal of housing, taxation and subsidies policies. Considering this interest, this paper investigates the issue of housing tenure in Belgium. On the basis of previous related research, a model of tenure choice is estimated using a sample of 6,962 households. The observations follow clearly the general trends described for other countries. Higher income and age, couple status and the presence of dependent children have positive influences on homeownership. In addition, locations presenting a high density of population and a high centrality are associated with a lower probability of homeownership compared with other areas. The underlying significations of these variables are discussed in the paper. [less ▲]

Detailed reference viewed: 93 (47 ULg)
Full Text
Peer Reviewed
See detailStability and bifurcation analysis of a Van der Pol–Duffing oscillator with a nonlinear tuned vibration absorber
Habib, Giuseppe ULg; Kerschen, Gaëtan ULg

Conference (2014, July)

The Van der Pol (VdP) oscillator is a paradigmatic model for description of self-excited oscillations, which are of practical interest in many engineering applications. In this paper the dynamics of a VdP ... [more ▼]

The Van der Pol (VdP) oscillator is a paradigmatic model for description of self-excited oscillations, which are of practical interest in many engineering applications. In this paper the dynamics of a VdP-Duffing (VdPD) oscillator with an attached nonlinear tuned vibration absorber (NLTVA) is considered; the NLTVA has both linear and nonlinear restoring force terms. In the first part of this work, the stability of the trivial solution of the system is investigated, following results of previous works. The analysis allows to define an optimal tuning rule for the linear parameters of the absorber, which substantially enlarges the domain of safe operation of the primary system. In this case, the system loses stability through a double Hopf bifurcation. In the second part of this work, the bifurcations occurring at the loss of stability are analytically investigated, using the technique of the center manifold reduction and transformation to normal form. The obtained results show the effects of the nonlinear parameter of the absorber, which, in turn, allows to define its optimal value in order to avoid subcriticality and reduce the amplitude of self-excited oscillations. [less ▲]

Detailed reference viewed: 41 (5 ULg)
Full Text
Peer Reviewed
See detailInverting Hydraulic Heads In An Alluvial Aquifer Constrained With Electrical Resistivity Tomography Data Through Multiple-Point Statistics And Probability Perturbation Method: A Case Study
Hermans, Thomas ULg; Scheidt, Celine; Caers, Jef et al

Conference (2014, July)

Solving spatial inverse problems in the Earth Sciences remains a considerable challenge given the large number of parameters to invert for, the non-linearity of forward models and as a result the ill ... [more ▼]

Solving spatial inverse problems in the Earth Sciences remains a considerable challenge given the large number of parameters to invert for, the non-linearity of forward models and as a result the ill-posedness of the problem. Geostatistics is therefore needed to specify prior models, more particularly, information to control the spatial features of the inverse solutions. We used multiple-point statistics (MPS) to build models of pre-defined hydrofacies: clay, sand and gravel facies constrained to geological data (hard data) and geophysical data (soft data). The electrical resistivity tomography method was chosen to bring relevant spatially distributed information on the presence of the facies, given its sensitivity to variations in lithology and porosity. The comparison of the geophysical signature of the deposits with direct observations in boreholes enables to derive the conditional probability of observing a facies given its electrical resistivity. This is used to produce probability maps for each facies and constrain stochastic simulations of the alluvial aquifer. Then, the probability perturbation method (PPM) is used to integrate hydraulic heads data, using MPS to generate models. This process enables us to obtain calibrated models of the aquifer. The PPM algorithm will automatically seek solutions fitting both hydrogeological data and training-image based geostatistical constraints. Only geometrical features of the model are affected by the perturbation, i.e. we do not attempt to directly find the optimal value of hydrogeological parameters (chosen a priori), but the optimal spatial distribution of facies whose prior distribution is quantified in a training image. The methodology is first tested with a synthetic benchmark. The tests performed show that the choice of the training image is a major source of uncertainty. Therefore, one first needs to select those training images consistent with the geophysical data (and hence reject the inconsistent ones). Then, we proceed with them to hydrogeological inversions. Geophysical data (soft constraints) acts as an accelerator of convergence by reducing prior uncertainty. The hydraulic conductivity of each facies is a sensitive parameter, but it can be easily optimized prior to the PPM process. The stochastic method is then successfully applied within the context of an alluvial aquifer submitted to a pumping experiment. We show how the integration of various sources of data (borehole logs, geophysics, hydraulic heads) aids in calibrating hydrogeological models, locating high hydraulic conductivity zones and reducing uncertainty. The developed methodology proposes a common framework (multiple-point statistics) to integrate various information sources with variable resolutions relevant for hydrogeology: geological, geophysical and hydrogeological data. The method can be extended to integrate tracer tests to enable the calibration of transport parameters as well. The originality of the method is to use geophysical data both to refine the choice of the training image and to constrain the inversion of hydrogeological models. [less ▲]

Detailed reference viewed: 37 (9 ULg)
Full Text
See detailModeling the hygrothermal response of a prefabricated straw bale panel and assessing its impact on indoor climate
Dubois, Samuel ULg; Evrard, Arnaud; Lebeau, Frédéric ULg

in 2014 ASABE and CSBE/SCGAB Annual International Meeting (2014, July)

Crop-based materials show many qualities in the quest for construction products with low environmental impact in the construction sector. Their ability to exchange moisture with indoor air offers new ... [more ▼]

Crop-based materials show many qualities in the quest for construction products with low environmental impact in the construction sector. Their ability to exchange moisture with indoor air offers new opportunities for improving interior user comfort and eventually buildings energy performance. Modeling their hygrothermal behavior has thus focused much attention, one of the main objectives being to assess more objectively the resulting performance at building scale. The first natural step in this modeling process is to understand the specific dynamics of heat and mass transfer within such materials. The Building Element Heat Air and Moisture (BEHAM) numerical models were designed to accurately predict internal conditions encountered in materials with partial balance equations. This envelope-based approach, however, requires the knowing of the interior and exterior climate conditions prior to the study. Therefore, it forbids any assessment of mutual exchange between the envelope to the indoor air and prevents any serious validation of the overall performance of materials. In response to this problem, the importance of developing whole building hygrothermal model has recently been raised. General scientific computational tools like MATLAB seem particularly adapted to perform this scaling-up, given their high flexibility and tools integration potentialities. In this communication we study a prefabricated straw bale panel subjected to two distinct and simple solicitations in a climatic chamber. A whole building hygrothermal model developed in MATLAB is then validated with the experimental datasets. The evolution of indoor conditions under the different tests is analyzed in details with an assessment of straw bales performance. [less ▲]

Detailed reference viewed: 24 (3 ULg)
Full Text
See detailTHE NORDIC TEST SYSTEM FOR VOLTAGE STABILITY ASSESSMENT
Van Cutsem, Thierry ULg

Conference (2014, July)

Detailed reference viewed: 45 (8 ULg)
Full Text
Peer Reviewed
See detailAre you sure this was your own idea?
Beaufort, Aline ULg; Brédart, Serge ULg; Dehon, Hedwige ULg

Poster (2014, July)

Detailed reference viewed: 9 (3 ULg)
Peer Reviewed
See detailSentence repetition task as a powerful diagnostic tool in French children with SLI
Leclercq, Anne-Lise ULg

Poster (2014, July)

Sentence repetition is considered as a psycholinguistic marker of specific language impairment (SLI) (i.e., Redmond et al., 2011). However, little is known about specificity and sensitivity for most ... [more ▼]

Sentence repetition is considered as a psycholinguistic marker of specific language impairment (SLI) (i.e., Redmond et al., 2011). However, little is known about specificity and sensitivity for most language tests, especially in French (Thordardottir et al., 2011). This study aims at assessing the specificity and sensitivity of a sentence repetition task frequently used in clinical evaluations (Chevrie-Muller et al., 2010). This task could be especially interesting because clinicians can compute separate linguistic scores depending on the answers produced by the children, enabling them to get a glimpse of the areas of language difficulties in these children. Fourty-four school-age children with SLI, and 34 age-and-IQ-matched controls participated in this study. Children with SLI were diagnosed by certified speech-language pathologists and attained specific language classes in special needs schools from at least one year. Moreover, they scored more than -1.25 SD below expected normative performance in at least 2 language areas on other standardised tests used in previous studies including French children with SLI. Results show that both sensitivity and specificity of general scores were high (over 80%) at three cut-off points widely used in clinical practice: -1SD, -1.25 SD, -2 SD. Moreover, an exploratory factorial analysis indicates that two distinct factors can be dissociated in children productions: a morphosyntactic factor and a lexico-semantic factor, together explaining 96.48% of the variance in production scores. These results reveal that the sentence repetition task is a powerful diagnostic tool in French children with SLI. [less ▲]

Detailed reference viewed: 48 (1 ULg)
Peer Reviewed
See detailFormal and semantic-discursive properties of mirative exprecctions (it's) no wonder: a synchronic-diachronic approach
Gentens, Caroline; Brems, Lieselotte ULg; Davidse, Kristin et al

Conference (2014, July)

Detailed reference viewed: 16 (1 ULg)
Full Text
Peer Reviewed
See detailAdvanced Aeroservoelastic Modeling for Horizontal axis Wind Turbines
Prasad, Chandra Shekhar ULg; Chen, Qiong-zhong; Dimitriadis, Grigorios ULg et al

in Cunha, A.; Caetano, E.; Riberio, P. (Eds.) et al Proceedings of the 9th International Conference on Structural Dynamics, EURODYN 2014 (2014, July)

This paper describes the development of a complete methodology for the unsteady aeroelastic and aeroservoelastic modeling of horizontal axis wind turbines at the design stage. The methodology is based on ... [more ▼]

This paper describes the development of a complete methodology for the unsteady aeroelastic and aeroservoelastic modeling of horizontal axis wind turbines at the design stage. The methodology is based on the implementation of unsteady aerodynamic modeling, advanced control strategies and nonlinear finite element calculations in the S4WT wind turbine design package. The aerodynamic modeling is carried out by means of the unsteady Vortex Lattice Method, including a free wake model. The complete model also includes a description of a doubly fed induction generator and its control system for variable speed operation and enhanced power output. The S4WT software features a non-linear finite element solver with multi-body dynamics capability. The complete methodology is used to perform complete aeroservoelastic simulations of a 2MW wind turbine prototype model. The interaction between the three components of the approach is carefully analyzed and presented here. [less ▲]

Detailed reference viewed: 14 (3 ULg)
Full Text
Peer Reviewed
See detailRisk assessment of soil compaction in Walloon Region
D'Or, Dimitri; Destain, Marie-France ULg

in Proceedings of geoENV2014 (2014, July)

It is well established that soil compaction affects the growth and functioning of roots and disrupts the activity of microfauna and soil microorganisms, resulting in a loss of yields. Agriculture and ... [more ▼]

It is well established that soil compaction affects the growth and functioning of roots and disrupts the activity of microfauna and soil microorganisms, resulting in a loss of yields. Agriculture and forestry using increasingly heavy machines, the risk of soil compaction is increasing accordingly. Chosen as indicator of the susceptibility of soils to compaction, the precompression stress (Pc) is calculated using the pedotransfer functions (PTFs) proposed by Horn and Fleige (2003). These PTFs involve eight parameters linked to the hydraulic and mechanical behaviour of soils: organic matter content, bulk density, air capacity, available and non-plant available water capacity, saturated hydraulic conductivity, cohesion and angle of internal friction. The challenge consists in producing Pc maps at the regional scale for Wallonia. Those maps should also be accompanied by estimation uncertainty map. Finally, the results should be exploited to produce compaction risk maps according to various frequent scenarios. In this paper, a methodology is proposed, combining geostatistics and Monte Carlo simulations, to achieve these goals. [less ▲]

Detailed reference viewed: 33 (6 ULg)
Full Text
Peer Reviewed
See detailExcavation damaged zone modelling including hydraulic permeability evolution in unsaturated argilaceous rock
Pardoen, Benoît ULg; Levasseur, Séverine ULg; Collin, Frédéric ULg

in Khalili, Nasser; Russell, Adrian R.; Khoshghalb, Arman (Eds.) Unsaturated Soils: Research & Applications (2014, July)

The drilling of galleries induces damage propagation in the surrounding medium and creates the Excavation Damaged Zone (EDZ) in which the material properties are modified. The prediction of the fracture ... [more ▼]

The drilling of galleries induces damage propagation in the surrounding medium and creates the Excavation Damaged Zone (EDZ) in which the material properties are modified. The prediction of the fracture structure and flow properties evolution within this zone are major issues especially in the context of underground nuclear waste storage. Since experimental results indicate that shear strain localisation appears prior to fractures, we model the EDZ with strain localisation in shear band mode using the coupled local second gradient model. The evolution of the intrinsic hydraulic permeability inside the fractures is taken into consideration as well as the influence of gallery ventilation on the rock desaturation. The numerical results provide information about the damaged zone extension, structure and behaviour with good correspondence to in situ measurements and observations. [less ▲]

Detailed reference viewed: 82 (31 ULg)
Full Text
Peer Reviewed
See detailHD 97658 and its super-Earth. Spitzer & MOST transit analysis and modeling of the host star
Van Grootel, Valérie ULg; Gillon, Michaël ULg; Valencia, D. et al

Conference (2014, July)

Super-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition ... [more ▼]

Super-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition. We present here the confirmation, based on Spitzer transit observations, that the super-Earth HD 97658 b transits its host star. HD 97658 is a low-mass ($M_*=0.77\pm0.05\,M_{\odot}$) K1 dwarf, as determined from the Hipparcos parallax and stellar evolution modeling. To constrain the planet parameters, we carry out Bayesian global analyses of Keck-HIRES radial velocities, and MOST and Spitzer photometry. HD 97658 b is a massive ($M_P=7.55^{+0.83}_{-0.79} M_{\oplus}$) and large ($R_{P} = 2.247^{+0.098}_{-0.095} R_{\oplus}$ at 4.5 $\mu$m) super-Earth. We investigate the possible internal compositions for HD 97658 b. Our results indicate a large rocky component, by at least 60% by mass, and very little H-He components, at most 2% by mass. We also discuss how future asteroseismic observations can improve the knowledge of the HD 97658 system, in particular by constraining its age. Orbiting a bright host star, HD 97658 b will be a key target for coming space missions TESS, CHEOPS, PLATO, and also JWST, to characterize thoroughly its structure and atmosphere. [less ▲]

Detailed reference viewed: 6 (1 ULg)