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See detailLes perspectives d'harmonisation du droit de la construction
Kohl, Benoît ULg

Conference (2010, November 18)

Detailed reference viewed: 26 (5 ULg)
Peer Reviewed
See detail"When history rhymes with trajectory". The stakes of language denomination in the historiography of the varieties of French spoken in Acadia and Louisiana
Urbain, Emilie ULg

Conference (2010, November 18)

The categorizations regarding language are rarely consensual, especially when considering linguistic minorities. Different types of stakes are hidden behind language designation, depending on whether the ... [more ▼]

The categorizations regarding language are rarely consensual, especially when considering linguistic minorities. Different types of stakes are hidden behind language designation, depending on whether the designation hinges upon activists or cultural, political or academic authorities. The metalinguistic terminology mobilized by discourses on language itself conveys linguistic ideologies. In the case of Acadia and Louisiana, the ideological positioning of French speakers is twofold: a positioning not only with respect to the Other English speaker, but also with respect to the Other French speaker. As French speaker, the tension is important between the willingness to claim and acknowledge divergent practices of a center, that is still hegemonic in the imaginary (France); and the willingness to erase the differences that would slow down an integration in the French-speaking world. That tension is discernible in the choice of denomination such as français acadien, français d’Acadie or français en Acadie. Focusing on Acadia and Louisiana, we consider and study the links between the metalinguistic terminology and the historiography of language. The history of language plays an ambiguous role. Mentioned to legitimate or depreciate linguistic practices towards a most often exogenous evaluative norm, it is also often associated with the external history of the conditions of implantation of French during colonization. Even though the history of language is seldom thematized, its position is central in these two communities where historical filiation (of Cajuns with Acadia, of Acadians with a mythical Acadia) even determines the ethnonyms. [less ▲]

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See detailGestion des invasives en Belgique : Une approche multi-facettes De la prévention à l’éradication
Mahy, Grégory ULg; Branquart, Etienne

Conference (2010, November 18)

Detailed reference viewed: 18 (1 ULg)
See detailZER Manucsripts of the Thousand and One Nights: Codicological features
Franssen, Elise ULg

Conference (2010, November 18)

In the end of the nineteenth century, the French orientalist Herman Zotenberg defined the « Egyptian Recension » of the text of the Arabian Nights; this group of manuscripts is now known as ZER (for « ... [more ▼]

In the end of the nineteenth century, the French orientalist Herman Zotenberg defined the « Egyptian Recension » of the text of the Arabian Nights; this group of manuscripts is now known as ZER (for « Zotenberg’s Egyptian Recension »). This classification is based on the tales, their succession, and the chronological and geographical origin of the manuscripts. This recension of the text is actually the best known version of the Nights, since most of the printed editions of the Thousand and One Nights are based on a manuscript being part of this group. Thus, this text seems to be well known but amazingly its manuscripts are not. No critical edition or deep study of any of them exists. Furthermore, some of the ZER manuscripts actually present similar codicological characteristics, such as their distribution in four volumes, or even the page setting and, sometimes, the handwriting. A precise codicological study of the ZER manuscripts permits determining if this group is as homogeneous as it appears on first sight or if, on the contrary, it can be divided into other subgroups. It gives information about the birth context of the group; where were the manuscripts copied? And for whom? Do they all derive from a single copy, the model being respected as far as in the physical aspect of the book? These are some of the questions I will try to answer. The collected codicological information will be compared to the conclusions of the narratological and philological study of each manuscript’s text. [less ▲]

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See detailCroyances métacognitives et hallucinations
Laroi, Frank ULg

Conference (2010, November 18)

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See detailInvestigation of anaerobic digestion in a two-stage bioprocess producing hydrogen and methane
Hiligsmann, Serge ULg; Hamilton, Christopher ULg; Beckers, Laurent ULg et al

Conference (2010, November 17)

Hydrogen has received wide attention in the last decades as a clean energy vector. The major advantage of energy generation from hydrogen is the near-zero carbon emissions, since the utilization of ... [more ▼]

Hydrogen has received wide attention in the last decades as a clean energy vector. The major advantage of energy generation from hydrogen is the near-zero carbon emissions, since the utilization of hydrogen, either via combustion or via fuel cells, results in pure water. Recently, there has been increasing interest on the biological production of hydrogen gas from renewable biomass such as carbohydrates from agriculture or agro-food industries. This specific anaerobic digestion is called dark fermentation and is involved in the classic anaerobic digestion producing methane. Indeed, in a two-step process, i.e. when acido- and aceto-genesis are carried out in a different bioreactor than methanogenesis, it is feasible to generate separated biogas flows containing either H2 or CH4 depending on specific operating parameters. This paper deals with the comparison of the first stage performances whether operated in optimum conditions for H2 production with a mixed culture or a pure Clostridium butyricum strain. Hydrogen yields of about 1.75 and 2.3 mol H2/mol glucose were achieved respectively. The metabolites, mainly acetate and butyrate, contained in the spent medium were efficiently converted to methane in a second anaerobic digester with a methane yield of about 170 ml/g COD initially fed in the first stage. [less ▲]

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See detailEtat d'avancement des études expérimentales entamées à l'université de Liège
Machiels, Olivier ULg

Conference (2010, November 16)

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See detail"Taming the publication machine", or Discourse Analysis made Subliminal
Thoreau, François ULg

Conference (2010, November 15)

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See detailL'insegnamento del diritto romano nel Belgio nel 2010
Gerkens, Jean-François ULg

Conference (2010, November 12)

Detailed reference viewed: 36 (1 ULg)
Peer Reviewed
See detailUse of stable isotopes to study pollutants in marine vertebrates
Das, Krishna ULg

Conference (2010, November 11)

Detailed reference viewed: 33 (8 ULg)
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See detailOn the Pragmatics of Subjectification: Emergence and Modalization of an Allative Future in Ancient Egyptian
Grossman, Eitan; Polis, Stéphane ULg

Conference (2010, November 11)

In this talk, we argue for a pragmatic basis for semantic change of the type observed in grammaticalization, viz., the conventionalization of conversational inferences (see, e.g., Bybee et al. 1994 ... [more ▼]

In this talk, we argue for a pragmatic basis for semantic change of the type observed in grammaticalization, viz., the conventionalization of conversational inferences (see, e.g., Bybee et al. 1994, Traugott & Dasher 2002, Ariel 2008) or more generally, the diachronic transfer of meaning from context to code (Givón 2005). Specifically, we claim that addressees (listeners/readers as active discourse participants) make inferences and in turn, as speakers/writers, propagate them, leading to their generalization. A crucial distinction must be made between SUBJECT-ORIENTED and SPEAKER-ORIENTED inferences, implicitly argued for in Bybee et al. (1994) and clearly downplayed in contemporary discussions such as Traugott & Dasher (2002). In SUBJECT-ORIENTED inferences, addressees interpret the utterance as a speaker’s report about the subject’s state of mind, while in the SPEAKER-ORIENTED ones, addressees interpret the utterance as reporting on the state of mind of the speaker. Speaker-oriented inferences are those that lead to the relaxing of selectional restrictions on subjects observed in a number of grammaticalization paths (illustration with allative future in the talk). Speaker-oriented inferences also lead to a rise in context-expansion and text frequency of constructions, which in turn catalyze many of the phenomena associated with grammaticalization. [less ▲]

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See detailCity museum, community and temporality: a historical perspective
Postula, Jean-Louis ULg

Conference (2010, November 10)

Detailed reference viewed: 21 (3 ULg)
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See detailEco-zonings : compte-rendu de la recherche CPDT 2009-2010
Van Der Kaa, Claire ULg

Conference (2010, November 09)

Dans le cadre d'une recherche exploratoire, le concept d'éco-zoning est encadré par comparaison à des concepts similaires présents dans la littérature, des études de cas et des rencontres avec les parties ... [more ▼]

Dans le cadre d'une recherche exploratoire, le concept d'éco-zoning est encadré par comparaison à des concepts similaires présents dans la littérature, des études de cas et des rencontres avec les parties prenantes. puis une définition en est formulée. La mise en oeuvre coordonnée de mesures d'aménagement et d'urbanisme, de management environnemental et d'écologie industrielle est préconisée pour contribuer à une plus grande durabilité des zones d'activité économique. Une structure d'évaluation des zones d'activité économique est élaborée. [less ▲]

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See detailGetting more out of end-of-life vehicles: a bio hydrometallurgical approach
Lewis, Grégory ULg; Lambert, Fanny ULg

Conference (2010, November 09)

Detailed reference viewed: 43 (12 ULg)
See detailLes doubles inhibitions du système rénine-angiotensine-aldostérone
Krzesinski, Jean-Marie ULg

Conference (2010, November 08)

Detailed reference viewed: 13 (1 ULg)
See detailLes plus gros soucis dentaires des adolescent
Verwilghen, Denis ULg

Conference (2010, November 08)

Detailed reference viewed: 16 (3 ULg)
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See detailEUCAST et stratégie antibiotique: impact en pneumologie
Melin, Pierrette ULg

Conference (2010, November 08)

Detailed reference viewed: 29 (0 ULg)
See detailActualités en hypertension
Krzesinski, Jean-Marie ULg

Conference (2010, November 07)

Detailed reference viewed: 11 (1 ULg)
Peer Reviewed
See detailZola sociologue du quotidien
Ledent, David ULg

Conference (2010, November 06)

Detailed reference viewed: 15 (1 ULg)
See detailPost 9/11 Revisions of the Superhero: Political Subtexts in the Comics’ Series Civil War and Black Summer
Dony, Christophe ULg

Conference (2010, November 06)

Superheroes have been supportive of the state’s ideologies for a long time. From WW II to the Cold War era, they have defended the status quo and fought countless enemies of the establishment while ... [more ▼]

Superheroes have been supportive of the state’s ideologies for a long time. From WW II to the Cold War era, they have defended the status quo and fought countless enemies of the establishment while showing strong nationalist ideology. Yet, in their long existence, these characters and the narratives they feature in, have been subject to many redefinitions, usually during periods of ideological conflicts such as the Vietnam War or the overtly pro-masculine and pro-war politics of the Reagan era. Following this logic, it seems interesting to raise the question whether or not the superhero genre changed after the events of 9/11 and the subsequent ‘War on Terror.’ This question becomes even more important when one draws a parallel between the Bush administration’s political rhetoric of the early aftermath, and the classical superhero Manichean formula whereby good usually prevails over evil. Whereas early superhero comics engaging with 9/11 presented cases of topical suffering, victimization, and sometimes revenge, later superhero texts have confronted readers with moral and political ambiguities. Indirectly or metaphorically referring to the traumatic events of September 11th and its aftermath, many post-9/11 superhero narratives have called into question the binary dialectic, long sustained by the medium itself, and rearticulated by the Bush administration; they have suggested that America was to some extent responsible for, or at least, implicated in the attacks. In doing so, these texts function as powerful political allegories which challenge America’s sense of moral exceptionalism, the state’s implementation of (inter)national security policies, and by extension, the very sociological role of the superheroic figure. In this paper, I aim to demonstrate how two recent superhero comics’ series – Marvel’s multi-authored cross-over Civil War (2006) and Warren Ellis and Juan Jose Ryp’s Black Summer (2008) – have allegorized the events of 9/11 to critique the above issues in different but related ways. More specifically, I argue that these narratives constitute revisions of traditional superhero texts which problematize the morality of superhero figures, comment on the pervasive effects of the mass media, and ultimately challenge the state’s intervention policies in the face of adversity. [less ▲]

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See detailThe active school concept: A project for PE teachers
Cloes, Marc ULg

Conference (2010, November 06)

Health is a particularly important concern in the today’s society as expenses linked to health problems are continuously increasing. Actions aiming to limit the phenomenon are needed and one of the ... [more ▼]

Health is a particularly important concern in the today’s society as expenses linked to health problems are continuously increasing. Actions aiming to limit the phenomenon are needed and one of the priorities consists to fight against the increasing prevalence of obesity. In this field, the emphasis has been set on nutrition and sedentariness. It clearly appears that school and physical education are key sectors that should be directly involved in the approach that should be implemented (Young & William, 1989; WHO, 2001). At school, any project that is focused on any aspect of the health would require the involvement of all actors: (1) the school principal who is in charge of the development of the school’s project and to orient the strategic decisions, and; (2) all other actors of the school life such the pedagogical staff but also the students and their parents as well as the medical structures if they exist. When it is question of promotion of a long life physically active lifestyle, the Scientific Statement from the American Heart Association Council (Pate et al., 2006) underlines five main dimensions that should be considered in order to determine the emphasis that one particular school provides: (1) physical education; (2) active transportation; (3) life environment (recesses, spaces); (4) sport at school, and; (5) physical activity in the classroom. We are considering that the presence of physical activity in the written educational school policy represents a sixth determining dimension that should be accessed in that perspective. In the analysis of 54 out of the 514 French speaking schools of Belgium, we showed that the mean score reached 9/20 with PA policy being the worst aspect (4.80/20) and facilities being the best (12.3/20). It seemed that the role that schools could play today in PA promotion is quite limited. These findings have been confirmed in another study based on 1997 Cale’s model of active school (Van Hoye, Motter & Cloes, 2009). On the other hand, a third study underlined that it was possible to improve the involvement of one primary school in PA promotion through one action research (Cloes & Dequenne, 2009). In the latter study, OPHEA (2009) model of active school was considered. Finally, other examples of initiatives aiming to increase school in the development of an active lifestyle will be described (L’école bouge, 2006). As stated by Tappe & Burgeson (2004), physical education should be considered as the corner stone of PA promotion at school. In fact, the physical education teacher is definitely the only teacher whose specific preparation allows developing theoretical and practical concepts related to physical activity and its effects on health. Beyond the fight against sedentariness, PE teachers are able to contribute effectively to the mastery of many other competences involved in the development of physically educated persons (NASPE, 1992). Nevertheless, in order to meet the requirements, it is needed that PE respects two current concepts: literacy and accountability. It means that PE has to develop attitudes, knowledge and competences that would be used lifelong by the students, on one hand; to bring concrete modifications in youths, on the other hand. Several principles should be applied to encourage students to adopt an active lifestyle: (1) being a model; (2) updating ones’ knowledge; (3) knowing ones’ students; (4) planning; (5) acting; (6) controlling. Theoretical foundations and examples will be provided in the presentation. Based on Cloes, Del Zotto and Motter (2009), several categories of specific actions are proposed by PE teachers in order to promote an active life style in their students. These actions aim to motivate students to be active, increase time on task or attendance or to encourage students to open their mind to a more positive attitude towards PA. As they mentioned, appreciating PE might be a first step in the direction of a lifelong active lifestyle In conclusion, we consider that PE teachers need to become aware about the change in the definition of their role. In 40 years, they passed from teaching gymnastics to teaching sports while the society asks them today to become agents of the development of lifelong PA competences. It means that, during initial or continuous preparation, PE teachers’ educators need to develop original activities that can help practitioners to develop their own actions on the field. According to the current development of the research on teacher education, this underlines the importance of collaborative research as well as the development of communities of practice. Strategies are existing and should be shared. Use of modern tools of communication represents a promising way to reach success. It should also be determining that professionals and researchers would learn to work together more closely. [less ▲]

Detailed reference viewed: 98 (6 ULg)
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See detail"Nouvelle économie", nouvelle élite ?
Geuens, Geoffrey ULg

Conference (2010, November 05)

Detailed reference viewed: 48 (18 ULg)
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See detailAnalysis of the atmospheric circulation simulated by GCMs over Greenland
Belleflamme, Alexandre ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

Conference (2010, November 05)

The variability of the geopotential height at 500 hPa simulated by General Circulation Models (GCMs) over Greenland is evaluated using an atmospheric circulation type classification. The GCM outputs for ... [more ▼]

The variability of the geopotential height at 500 hPa simulated by General Circulation Models (GCMs) over Greenland is evaluated using an atmospheric circulation type classification. The GCM outputs for the current climate (20C3M) are first compared to reanalysis data over 1961-1990. The comparison shows that most of them simulate well the main circulation types but fail to reproduce their frequencies because of underestimations of circulation variability and biases in the mean geopotential height. GCM-based future projections do not individualise new circulation types but show a general increase of the geopotential height. Based on this approach, the correlation between surface temperature and atmospheric circulation offers a new way for estimating the Greenland ice sheet melt. [less ▲]

Detailed reference viewed: 44 (14 ULg)
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See detailE-nose development to predict odour annoyance in a receptor site
Romain, Anne-Claude ULg; Nicolas, Jacques ULg

Conference (2010, November 05)

Detailed reference viewed: 64 (20 ULg)
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See detailWhich career perspectives for young scientists?
Cavalier, Etienne ULg

Conference (2010, November 04)

Detailed reference viewed: 14 (2 ULg)
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Peer Reviewed
See detailHow can QbD be used and implemented to optimize method development and validation?
Lebrun, Pierre ULg; Boulanger, Bruno ULg; Hubert, Philippe ULg

Conference (2010, November 04)

Through an example, the way to apply Design of Experiments and the Bayesian modeling to develop robust optimal ligand-binding assays (LBA) will be presented. The objectives of a LBA will be re-examined ... [more ▼]

Through an example, the way to apply Design of Experiments and the Bayesian modeling to develop robust optimal ligand-binding assays (LBA) will be presented. The objectives of a LBA will be re-examined and response of interest derived (precision profile). The concept of Design Space specific for LBA will be introduced in relation with validation, routine and transfer [less ▲]

Detailed reference viewed: 83 (12 ULg)
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See detailExpertise of the Research Unit"Environmental Monitoring"
Romain, Anne-Claude ULg

Conference (2010, November 04)

Detailed reference viewed: 23 (10 ULg)
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Peer Reviewed
See detailSpecificities of social enterprise development in Eastern Asia
Defourny, Jacques ULg

Conference (2010, November 04)

Detailed reference viewed: 28 (9 ULg)
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See detailProjectively equivariant quantizations over the superspace R^{p|q}
Radoux, Fabian ULg

Conference (2010, November 03)

Detailed reference viewed: 6 (4 ULg)
See detailLes carrières professionnelles des cadres : regard croisé du genre et de l'âge
Grodent, Françoise ULg

Conference (2010, November)

Ce papier a pour objectif de réaliser une revue de littérature qui doit permettre de construire une recherche empirique visant à apporter une vision comparative des carrières des hommes et des femmes ... [more ▼]

Ce papier a pour objectif de réaliser une revue de littérature qui doit permettre de construire une recherche empirique visant à apporter une vision comparative des carrières des hommes et des femmes cadres en regard de trois groupes d’âge : les moins de 35 ans, les [35-50] ans et les plus de 50 ans. Nous considérons les deux sexes étant donné que les trajectoires professionnelles sont influencées par le sexe de la personne ainsi que par les stéréotypes et les rôles qui y sont directement associés (genre). Les générations, quant à elles, nous permettront de tenir compte de l’évolution des facteurs de contexte que sont notamment ces rôles attribués au masculin et au féminin à travers les époques. En effet, les constructions sociales liées au sexe des individus sont susceptibles de changer d’une génération à l’autre et donc d’agir distinctement sur les intentions de carrière. Le fait d’introduire la dimension générationnelle, en plus de celle du genre, est l’occasion d’aborder le concept d’intersectionnalité qui consiste en un croisement des groupes cibles propres à la gestion de la diversité. A l’issue de cet aperçu théorique faisant état de la littérature existante relative à cette thématique des carrières des individus occupant un poste à responsabilités, nous pourrons mettre en évidence différentes questions de recherche qu’il nous faudra, dans un second temps, confronter à la réalité du terrain. [less ▲]

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See detailLa correction d'indices de détection de patrons de réponses inappropriés paramétriques: une étude de type Monte Carlo
Béland, Sébastien; Raîche, Gilles; Magis, David ULg

Conference (2010, November)

L’une des conditions à respecter afin d’interpréter adéquatement les scores obtenus à un test est de s'assurer que les sujets ont répondu selon leur habileté réelle. Or, il se peut que certains individus ... [more ▼]

L’une des conditions à respecter afin d’interpréter adéquatement les scores obtenus à un test est de s'assurer que les sujets ont répondu selon leur habileté réelle. Or, il se peut que certains individus tentent de se surclasser en trichant ou de se sous-classer intentionnellement. Par chance, de nombreuses méthodes ont été développées pour détecter les individus qui adoptent de telles stratégies. Dans le cadre de cette présentation, nous nous intéresserons plus particulièrement aux indices de détection de patrons de réponses inappropriés. L’utilisation des indices de détection paramétriques comporte de nombreuses limites (Meijer et Sijtsma, 2001). Par exemple, nous savons que plusieurs indices ne peuvent pas être interprétés à partir des quantiles d’une loi de distribution connue. De plus, il est connu que l’utilisation d’une estimation de l’habileté peut grandement affecter la distribution connue de certains indices. Afin de dépasser les problèmes précédents, Snijders (2001) a développé une approche permettant de corriger les indices de détection de patrons de réponses inappropriés lorsqu'une estimation de l’habileté est considérée. Les indices ainsi corrigés suivent asymptotiquement une loi normale standard, ce qui permet la définition de seuils de détection de patrons inappropriés. Nous présenterons comment cette correction permet d'améliorer l'identification des patrons de réponses problématiques, notamment grâce à une diminution de l'écart entre l’erreur de type I empirique et le niveau de signification nominal. Une approche par simulation de données de type Monte Carlo sera présentée, et différents estimateurs de l'habileté (maximum de vraisemblance, maximum de vraisemblance a posteriori, maximum de vraisemblance pondérée) seront utilisés. [less ▲]

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See detailL'électromyographie laryngée
FINCK, Camille ULg

Conference (2010, November)

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See detailCombination of different techniques and multi-scale approach to understand CO2 budget in a temperate beech forest
Longdoz, Bernard; Epron, Daniel; Goffin, Stéphanie ULg et al

Conference (2010, November)

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See detailPhysical education teachers as physical activity promoters: Examples of initial/continuous preparation processes
Cloes, Marc ULg

Conference (2010, November)

Literature emphasizes the increasing prevalence of obesity. This phenomenon is related to growing health problems and to their cost for the society in terms of health expenses as well as lack of human ... [more ▼]

Literature emphasizes the increasing prevalence of obesity. This phenomenon is related to growing health problems and to their cost for the society in terms of health expenses as well as lack of human well-being. Sedentary lifestyle is systematically pointed out as one of the determining factors at the origin of this situation. WHO (2001) underlined the need of a multifactorial action while Pate et al. (2006) highlighted the school’s central role. Within the school, it seems that the physical education (PE) teacher represents the corner stone of any process aiming to promote physical activity (PA) (USDHHS, 1996; Tappe & Burgeson, 2004). Nevertheless, when determining if PE teachers are ready to be the expected PA promoters, it appears that, in Wallonia (as it could be the case in other countries), several data show that the answer is not really positive. It seems that PE teachers need some support in order to make youths physically active, and adopting a healthy lifestyle. In fact, proposing traditional lessons focusing on sport would not be sufficient to reach these objectives. In this way, PE teacher educators should have two priorities: (1) to clarify the PE teachers’ representations of PA and (2) to identify and share strategies aiming to define their potential actions on the field. The presentation illustrated four approaches that were experimented at the University of Liege in pre- and in-service PE teacher education. The major goal of the speech was to involve the participants by stimulating reflexibility and content development. Four questions have been in the centre of the activity: (1) What is physical Activity? (2) What must be done, finally? (3) How to deal with arguments against practice? (4) What could do PE teachers to promote an active lifestyle? Each question was discussed through distinct approaches that could be used by the participants in their own practice. [less ▲]

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See detailDes modèles psychométriques pour corriger les résultats dans des enquêtes malgré les tentatives de fraude
Raîche, Gilles; Béland, Sébastien; Magis, David ULg

Conference (2010, November)

Dans le contextes des enquêtes, il arrive fréquemment que les répondants ne fournissent pas nécessairement des réponses appropriées. C'est le cas notamment en ce qui a trait aux cas de fraudes dans les ... [more ▼]

Dans le contextes des enquêtes, il arrive fréquemment que les répondants ne fournissent pas nécessairement des réponses appropriées. C'est le cas notamment en ce qui a trait aux cas de fraudes dans les épreuves d'évaluation des habiletés disciplinaires. À cette fin, des modèles psychométriques ont été proposés pour corriger le résultat d'un étudiant malgré ses tentatives de fraudes. Ces modèles reposent toutefois uniquement sur des réponses de type dichotomique ou seulement une bonne ou une mauvaise réponse est considérée. Ces comportements de fraude sont également présents à l'intérieur des enquêtes d'opinion qui s'intéressent aux perceptions des répondants. La plupart du temps les réponses à ces enquêtes présentent plus d'un choix de réponses et sont alors dits polytomiques. Récemment, de nouvelles modélisations appropriées pour ce type de réponses ont été proposées. Elles seront présentées et accompagnées d'exemples d'application. [less ▲]

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See detailStrengthening local innovations in rice processing through video in Benin
Zossou, Enangnon ULg; Van Mele, Paul; Vodouhe, Davo Simplice et al

Conference (2010, November)

In Africa, rice processing provides employment for many rural people. A survey on local rice processing methods in the north, central and south of Benin shows that local rice is often parboiled before ... [more ▼]

In Africa, rice processing provides employment for many rural people. A survey on local rice processing methods in the north, central and south of Benin shows that local rice is often parboiled before milling. Rice parboiling is an important transformation process that contributes greatly to enhancing quality of rice. This important income generating activity is exclusively done by women from rice producing communities. In Benin, the traditional rice parboiling method is still prevailing and does not lead to quality rice. To address this, an improved rice parboiling technology was developed. AfricaRice subsequently developed a video where rural women explain how to use this improved technology. Four NGOs in central Benin publicly screened the video in 80 villages. After women watched the video, they started using the improved parboiler equipment individually or collectively. Women who didn’t have the financial support to buy the improved equipment understood its principle and developed creative solutions based on the idea of pre-cooking paddy with steam. Video watching also made women pay attention to reducing the loss of steam and to use local resources innovatively to conserve energy. Women also improved the quality of their parboiled rice by removing dirt, properly washing rice and drying rice on tarpaulins. On the other hand, in the north and south of Benin where there were no public video screenings, the traditional rice parboiling method is still predominant. This study shows the potential of farmer-to-farmer video to improve farmers’ practices and their attitudes to work collectively in agro-processing and marketing. [less ▲]

Detailed reference viewed: 32 (4 ULg)
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See detailRacism as a Tool in a Neoliberal Age. Mining in South African Companies in Ghana
Andre, Géraldine ULg; Hilgers, Mathieu

Conference (2010, November)

Detailed reference viewed: 25 (1 ULg)
Peer Reviewed
See detailBulk melt-processed (RE)BCO superconductors subjected to AC fields in “parallel” and “crossed” direction, experiment and modelling
Vanderbemden, Philippe ULg; Fagnard, Jean-François ULg; Babu, N. H. et al

Conference (2010, November)

When bulk melt-processed (RE)BCO samples are used as permanent magnets in various engineering applications (e.g. rotating machines, magnetic bearings), they may experience transient or periodic variations ... [more ▼]

When bulk melt-processed (RE)BCO samples are used as permanent magnets in various engineering applications (e.g. rotating machines, magnetic bearings), they may experience transient or periodic variations of the applied magnetic field. In such a situation, the remnant magnetization of the sample is found to decrease in running operation, which is particularly inconvenient for the long-term reliability of the system. There are several possible causes for such a phenomenon. The first is the temperature increase resulting from the losses caused by the variable applied field, and may arise when the field is parallel to the main direction of the trapped flux. The second is caused by the component of the magnetic field perpendicular to the main direction of the trapped flux (“crossed field” configuration). In the present talk we review the relevant parameters which have a detrimental impact on the remnant magnetization in both cases. Modelling results are compared to experimental data obtained on bulk YBCO samples subjected to field oscillations of large amplitude. [less ▲]

Detailed reference viewed: 55 (19 ULg)
See detailOpacity and intability strips in B stars
Salmon, Sébastien ULg

Conference (2010, November)

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See detailThe A3 gene of Alcelaphine herpesvirus 1 encodes a viral semaphorin that is non-essential for the induction of malignant catarrhal fever
Myster, Françoise ULg; Palmeira, Leonor ULg; Vanderplasschen, Alain ULg et al

Conference (2010, November)

Alcelaphine herpesvirus 1 (AlHV-1) is a γ-Herpesvirus carried by wildebeest asymptomatically. AlHV-1 is however responsible for the development of malignant catarrhal fever (MCF) when cross-species ... [more ▼]

Alcelaphine herpesvirus 1 (AlHV-1) is a γ-Herpesvirus carried by wildebeest asymptomatically. AlHV-1 is however responsible for the development of malignant catarrhal fever (MCF) when cross-species transmitted to a variety of ruminant susceptible species. Wildebeest-derived (WD)-MCF is a frequently fatal lymphoproliferative and degenerative disease of ruminants. Experimentally, WD-MCF can be reproduced in rabbits. The A3 open reading frame (ORF) of the AlHV-1 encodes a putative semaphorin homolog protein, thereafter named AlHV-sema. Semaphorins are secreted and membrane-associated proteins characterized by a conserved amino-terminal ‘Sema’ domain. Initially identified as guidance factors that assist axons pathfinding during neural development, semaphorins have been shown over the last decade to have significant functions in various processes of immunoregulation. Bioinformatics analyses revealed that AlHV-sema has a high homology to the cellular Sema7A. Besides its roles in neural development, Sema7A has been shown to play pivotal functions in the regulation of cytokine secretion and as a tumor suppressor. In order to investigate whether AlHV-Sema could play a role in the pathogenesis of WD-MCF, we used the AlHV-1 BAC clone and produced a strain deleted for A3 and a revertant strain. The strain deleted for A3 replicated comparably to the wild-type parental strain in vitro. In vivo, rabbits infected with the strain deleted for A3 developed WD-MCF similarly to that observed with the parental strain with both severely increased CD8+ T cell frequencies and viral genomic charge over time in peripheral blood and in lymph nodes at time of death, as well as indistinguishable histopathological lesions in lymphoid organs and in liver, lung and kidney. In conclusion, this study demonstrates that AlHV-sema is not essential for the induction of WD-MCF in rabbits. [less ▲]

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See detailLe minerai de fer en Wallonie
Denayer, Julien ULg

Conference (2010, November)

Detailed reference viewed: 207 (15 ULg)
See detailClosing address for the session "Bullks and Characterization"
Vanderbemden, Philippe ULg

Conference (2010, November)

Detailed reference viewed: 22 (2 ULg)
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See detailComoment Risk and Stock Returns
Lambert, Marie ULg; Hübner, Georges ULg

Conference (2010, November)

Detailed reference viewed: 8 (0 ULg)
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See detailRANS Simulations of Supersonic Combustion using a Flamelet-based Model
Terrapon, Vincent ULg

Conference (2010, November)

Detailed reference viewed: 20 (2 ULg)
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See detailLie group integrators for the numerical solution of DAE’s in flexible multibody dynamics
Cardona, Alberto; Bruls, Olivier ULg; Arnold, Martin

Conference (2010, November)

Detailed reference viewed: 65 (1 ULg)
Peer Reviewed
See detailLa recherche sur le procéssus de changement en thérapie familiale
D'Amore, Salvatore ULg

Conference (2010, October 29)

Detailed reference viewed: 12 (1 ULg)
See detailTraitements topiques du psoriasis
Piel, Géraldine ULg

Conference (2010, October 29)

Detailed reference viewed: 22 (5 ULg)
Peer Reviewed
See detailRuptures, pertes et reconstruction identitaire au sein des nouvelles familles: le cas de la famille homoparentale recomposée
D'Amore, Salvatore ULg; Scarciotta, Lidia; Pauss, Véronique

Conference (2010, October 29)

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See detailStruggling with emerging instruments in Belgium: how do institutions adapt to contingency of tentative governance ?
Fallon, Catherine ULg

Conference (2010, October 29)

During the last decennia, the Walloon region in Belgium has launched new instruments to support university research, with a turn to a more systemic and strategic vision. A new program called "Poles of ... [more ▼]

During the last decennia, the Walloon region in Belgium has launched new instruments to support university research, with a turn to a more systemic and strategic vision. A new program called "Poles of Competitiveness" supports collaborative research in areas selected as strategically important by the Government (eg. pharmagenomics). This dynamics piles up on the new pattern of support to the valorisation of research within the universities, with new public funds available for IP valorisation and support to spinoffs. The Government is also associated with major pharmaceutical firms and university research centres in public-private partnerships. These are three examples of the policy lines developed at the regional level under the mantra of "open innovation", emphasizing the importance of close collaboration between university and industry researchers within "interorganisationnal networks of learning". These new instruments interfere with established forms of distributed governance: industry partners are called upon to take the lead in the strategic management of large research programs and universities entered rapidly the game, while the regional administration was put on the side. Based on field research (interviews with actors of the STI in Wallonia), the paper proposes to discuss the impact of this transformation on the actors of the STI regime (university organisations; researchers; public administration). How does this new macro-narrative transform the existing socio-technical landscape? Why do the political authorities avoid any form of opening of the governance process? The collected material is rich enough to apprehend the complexity of institutions, norms, discourses and networks of the different stakeholders within the STI regime and to analyse how they adapted to take advantage of the new set of policy instruments. How do the partners position themselves with regard to the very narrowly instrumental logics of the "poles of competitiveness"? Administration is trapped with visions of public services somehow at odds with the new rationale for more university-industry partnerships. University researchers themselves tend to enter these new playing field while keeping the freedom to lay back on other historically available instruments. Tentative governance is a dynamic reality, open to the tensions of the set of actors associated to the process. Instruments and institutions are to be considered not as static but as dynamic, undergoing continuous transformation to adapt to contingency, particularly as long as the scientific sector considered is an "emerging one" where all the actors are fighting to keep open the rules of the game. [less ▲]

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See detailLes clauses pénales - Rapport belge
Biquet, Christine ULg

Conference (2010, October 28)

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See detailExtra-solar planet imaging: ground vs. space based coronagraphs
Hanot, Charles ULg

Conference (2010, October 28)

In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast and angular resolution imaging has ... [more ▼]

In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast and angular resolution imaging has allowed direct images of several exoplanetary systems to be taken (cf. HR 8799, Fomalhaut and β Pic). In the near future, several new instruments are going to dramatically improve our sensitivity to exoplanet detection. Among these, SPHERE (Spectro Polarimetric High contrast Exoplanet REsearch) at the VLT, MIRI (Mid Infra-Red Instrument) onboard JWST and EPICS at the ELT will be equipped with coronagraphs to reveal faint objects in the vicinity of nearby stars. We made use of the Lyon group (COND) evolutionary models of young (sub-)stellar objects and exoplanets to compare the sensitivities of these different instruments using their estimated coronagraphic profiles. From this comparison, we present a catalogue of targets which are particularly well suited for the different instruments. [less ▲]

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See detailExtra-solar planet imaging: ground vs space based coronagraphs
Hanot, Charles ULg; Absil, Olivier ULg; Boccaletti, A. et al

Conference (2010, October 28)

In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast and angular resolution imaging has ... [more ▼]

In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast and angular resolution imaging has allowed direct images of several exoplanetary systems to be taken (cf. HR 8799, Fomalhaut and β Pic). In the near future, several new instruments are going to dramatically improve our sensitivity to exoplanet detection. Among these, SPHERE (Spectro Polarimetric High contrast Exoplanet REsearch) at the VLT, MIRI (Mid Infra-Red Instrument) onboard JWST and EPICS at the ELT will be equipped with coronagraphs to reveal faint objects in the vicinity of nearby stars. We made use of the Lyon group (COND) evolutionary models of young (sub-)stellar objects and exoplanets to compare the sensitivities of these different instruments using their estimated coronagraphic profiles. From this comparison, we present a catalogue of targets which are particularly well suited for the different instruments. [less ▲]

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See detailFirst manufactured diamond AGPM vector vortex for the L- and N-bands: metrology and expected performances
Delacroix, Christian ULg; Forsberg, Pontus; Karlsson, Mikael et al

Conference (2010, October 28)

The AGPM (Annular Groove Phase Mask, Mawet et al. 2005) is an optical vectorial vortex coronagraph (or vector vortex) synthesized by a circular subwavelength grating, that is a grating with a period ... [more ▼]

The AGPM (Annular Groove Phase Mask, Mawet et al. 2005) is an optical vectorial vortex coronagraph (or vector vortex) synthesized by a circular subwavelength grating, that is a grating with a period smaller than λ/n (λ being the observed wavelength and n the refractive index of the grating substrate). Since it is a phase mask, it allows to reach a high contrast with a small working angle. Moreover, its subwavelength structure provides a good achromatization over wide spectral bands. Recently, we have manufactured and measured our first N-band prototypes that allowed us to validate the reproducibility of the microfabrication process. Here, we present newly produced mid-IR diamond AGPMs in the N-band (~10 µm), and in the most wanted L-band (~3.5 µm). We first give an extrapolation of the expected coronagraph performances. We then present the manufacturing and measurement results, using diamond-optimized microfabrication techniques such as nano-imprint lithography (NIL) and reactive ion etching (RIE). Finally, the subwavelength grating profile metrology combines surface metrology (scanning electron microscopy, atomic force microscopy, white light interferometry) with diffractometry on an optical polarimetric bench and cross correlation with theoretical simulations using rigorous coupled wave analysis (RCWA). [less ▲]

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See detailSerum haptoglobin is reduced in obese dogs submitted to a weight loss program and fed a sc-FOS enriched diet
Ricci, Rebecca; Jeusette, Isabelle; Godeau, Jean-Marie ULg et al

Conference (2010, October 26)

Detailed reference viewed: 35 (3 ULg)
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See detailDiamond subwavelength gratings for mid-infrared AGPM coronagraph: manufacturing assessment
Delacroix, Christian ULg; Habraken, Serge ULg; Karlsson, Mikael et al

Conference (2010, October 26)

We present the manufacturing and measurement results obtained with a mid-infrared (L-band ~ 3.8 µm) diamond Annular Groove Phase Mask (AGPM) coronagraph (Mawet et al 20051), using subwavelength gratings ... [more ▼]

We present the manufacturing and measurement results obtained with a mid-infrared (L-band ~ 3.8 µm) diamond Annular Groove Phase Mask (AGPM) coronagraph (Mawet et al 20051), using subwavelength gratings and diamond-optimized micro-fabrication techniques such as Nano-Imprint Lithography and Reactive Ion Etching. [less ▲]

Detailed reference viewed: 64 (12 ULg)
See detailZotenberg's Egyptian Recension of the Thousand and one Nights
Franssen, Elise ULg

Conference (2010, October 25)

Detailed reference viewed: 17 (0 ULg)
See detailMetabolomics : a new insight into cells and organisms diseases
De Tullio, Pascal ULg

Conference (2010, October 25)

Detailed reference viewed: 40 (1 ULg)
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See detailA VLTI/AMBER closure-phase search for low-mass companions around nearby young stars: first results on beta Pictoris
Absil, Olivier ULg; Le Bouquin, J.-B.; Chauvin, G. et al

Conference (2010, October 25)

Young stars in nearby moving groups and associations are well suited to search for low-mass companions. In addition to their brightness, their proximity gives access to small linear separations and their ... [more ▼]

Young stars in nearby moving groups and associations are well suited to search for low-mass companions. In addition to their brightness, their proximity gives access to small linear separations and their youth makes potential low-mass companion brighter than around older main sequence stars. We have recently started a survey of such young nearby stars with the AMBER near-infrared interferometer at the VLTI. The closure phase measurements provided by AMBER on a triplet of baselines are particularly sensitive to nearby off-axis point-like sources. In this talk, we describe the first results of this survey obtained on beta Pictoris. Thanks to a closure phase accuracy of a few 0.1 degree, we show that a 3-sigma sensitivity of about 4e-3 can be reached on the contrast of potential companions for angular separations between 0.01 and 0.2 arcsec. This translates into a companion mass of about 35 Mjup from 0.2 to 4 AU in the case of beta Pictoris. We extrapolate this result on other stars of our survey and discuss the discovery space of AMBER. [less ▲]

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See detailFlood risk analysis in Wallonia: micro (and meso-)scale approaches
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2010, October 25)

Flood risk analysis has been undertaken in Wallonia in the framework of several national and international research projects. The analysis relies on a micro-scale procedure, which involves • hazard ... [more ▼]

Flood risk analysis has been undertaken in Wallonia in the framework of several national and international research projects. The analysis relies on a micro-scale procedure, which involves • hazard modelling by means of detailed 2D inundation modelling • as well as processing of high resolution topographic and land use database for vulnerability modelling. The inundation modelling is conducted using the fully dynamic flow model WOLF 2D, entirely developed at the University of Liege. The model is run on a highly accurate DEM resulting from the combination of laser altimetry and, when available, sonar bathymetry. The typical grid spacing for the simulations is kept as low as 2m, which is definitely fine enough to represent the complex flows occurring at the scale of individual buildings and streets in urbanized floodplains. In this way, both the static and dynamic impacts of the flow may be characterized for all affected assets. This approach has been extensively applied since 2003 to issue inundation maps throughout the Walloon region based on detailed 2D flow modelling. Consequently, the outcomes of such detailed inundation modelling constitute suitable inputs for the subsequent exposure analysis, performed at a micro-scale using detailed land use maps and geographic database. Eventually, based on a multidisciplinary work, the procedure may incorporate social flood impact analysis and evaluation of direct economic damage to different categories of buildings and land types. Besides detailing the characteristics and performance of the hazard modelling, the presentation will describe the flow of data within the overall risk analysis procedure and will demonstrate its applicability by means of a case study, for which three different flood protection measures have been evaluated. These include rehabilitation of an old canal, recalibration of a floodplain as well as heightening of a protection wall by means of mobile dikes. The risk-oriented analysis of these flood protection measures has lead to findings which would not have arisen from a more standard hydraulic study such as based on a design flood. The flood risk analysis procedure is now readily available for large scale applications throughout the hydrographic basins in Wallonia and, in the near future, it will be combined with catchment modelling (accounting for climate change projections) to evaluate upstream flood mitigation measures as well as for the fine tuning of reservoir management rules in the framework of adaptation strategies to climate change. [less ▲]

Detailed reference viewed: 78 (16 ULg)
See detailTraumatisme médullaire : de la Clinique à la Recherche Fondamentale.
Martin, Didier ULg

Conference (2010, October 25)

Detailed reference viewed: 11 (0 ULg)
See detailMacromolecular engineering to the service of advanced drug delivery systems
Jérôme, Christine ULg

Conference (2010, October 25)

Detailed reference viewed: 7 (4 ULg)
Peer Reviewed
See detailProbing recognition processes, forces, and motions in single bio-inspired molecules
Willet, N; Lussis, Perrine ULg; Svaldo Lanero, Tiziana ULg et al

Conference (2010, October 24)

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See detailThere is no more place for utopia
Prégardien, Michel ULg

Conference (2010, October 22)

This paper calls about the possibility of utopia, today, in a world dominated by capitalism power and his need of saturating all the space (endless housing estate). The question is : how to think about ... [more ▼]

This paper calls about the possibility of utopia, today, in a world dominated by capitalism power and his need of saturating all the space (endless housing estate). The question is : how to think about utopia, when there is no place to build it, ever physically or mentally. [less ▲]

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See detailInterests of regional modelisation for wind power forecasting
Doutreloup, Sébastien ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

Conference (2010, October 22)

European policies have decided to reduce the greenhouse gas emissions of 20% and to reach 20% of renewable power production by 2020. Increasing wind power is one of the numerous solutions to reach these ... [more ▼]

European policies have decided to reduce the greenhouse gas emissions of 20% and to reach 20% of renewable power production by 2020. Increasing wind power is one of the numerous solutions to reach these goals. However, this kind of energy production depends on the meteorological conditions and gives it an intermittent behaviour. The wind speed variations cause voltage and frequency fluctuations that are unacceptable for the power grid. Therefore, forecasting production will become essential with the aim of integrating this kind of energy production into the power grid. We have developed and compared two forecasting models which give as outputs the wind power production every 15 minutes over the Belgian territory: the first one uses the outputs from the global model GFS (available at a horizontal resolution of 0.5° every 3h) and the second one uses the regional climate model WRF-NMM (using a horizontal resolution of 4km). Both of these models predict the wind speed and transform wind speed into wind power production, using a power curve which depends on the wind turbines and their characteristics. The first model using the GFS outputs is not precise enough in space and time to correctly forecast the wind speed in punctual wind farms. That is why we apply some specific tunings on these forecasts. These tunings depend on the air density, the wind direction and the stability of the air mass. The second model using the WRF-NMM outputs runs over the Belgian territory. Initial conditions are forced by the GFS outputs at 0.5° and WRF computes a physical based spatio-temporal downscaling of the meteorological variables. The outputs have a spatial resolution of 4 km and a time resolution of 15 minutes. Some tunings are also needed to adjust the wind power forecasts by comparison to the wind power observations. We present here some results of both models and the interest of using a regional model for more precise wind power forecasting. [less ▲]

Detailed reference viewed: 63 (9 ULg)
See detailLes soins à domicile en oncologie pédiatrique
Dresse, Marie-Françoise; Missotten, Pierre ULg; Janssen, Rita et al

Conference (2010, October 22)

Detailed reference viewed: 100 (21 ULg)
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See detailORBi, the open repository of Ulg and the geographers: first statistics analyzed
Stirbu, Simona ULg

Conference (2010, October 22)

Set up by the University of Liège, ORBi (Open Repository and Bibliography) knew a lightning increase of the deposits since its creation in 2008. The official launch took place on November 26th, 2008 and ... [more ▼]

Set up by the University of Liège, ORBi (Open Repository and Bibliography) knew a lightning increase of the deposits since its creation in 2008. The official launch took place on November 26th, 2008 and after considerable efforts on behalf of the team which manages the tool and researchers who introduce themselves their publications, the contents of the repository managed to reach a value of fifty thousand seven hundred references among which thirty thousand four hundred with full text. Working for the library of Geography of the University of Liège, I found interesting to bend over the "statistics" supplied by ORBi, concerning the number of visualizations and downloads of the references deposited by the geographers of Liège. On base of the statement of various "statistical" data and the analysis of these data, I try to determine if the deposit of the scientific works in ORBi increases - or may increase the visibility of the scientific works of the geographers from Liège. [less ▲]

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See detailLes norovirus: agents entéropathogènes méconnus en Médecine Humaine
HUYNEN, Pascale ULg

Conference (2010, October 21)

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See detailA method to assess transport consumptions in suburban areas
Marique, Anne-Françoise ULg; Reiter, Sigrid ULg

Conference (2010, October 21)

Detailed reference viewed: 60 (19 ULg)
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See detailLes valves percutanées
ERPICUM, Marie ULg

Conference (2010, October 21)

Detailed reference viewed: 43 (12 ULg)
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See detailLa Carte numérique d’Occupation du Sol de Wallonie version 2_07
Gheysen, Thibaut; Lejeune, Philippe ULg

Conference (2010, October 20)

La version 1 de la carte numérique d’occupation du sol de Wallonie (COSW) a été produite en 2007 pour les années de référence 2001, 2003 et 2005. Cette réalisation répondait à un besoin important de ... [more ▼]

La version 1 de la carte numérique d’occupation du sol de Wallonie (COSW) a été produite en 2007 pour les années de référence 2001, 2003 et 2005. Cette réalisation répondait à un besoin important de description de cette thématique sur l’ensemble du territoire wallon. En effet, à cette époque, la seule couche disponible était le plan d’occupation du sol (raster, 1:50 000) basé sur des données de la fin des années 80 ! La méthode utilisée pour produire cette carte repose sur l’utilisation d’une couche de base qui est le PLI (Plan de Localisation Informatique). Celui-ci est combiné avec la nature de la matrice cadastrale et croisé par géotraitements avec différentes couches décrivant certaines thématiques de l’occupation du sol : le parcellaire agricole (issu du SIGEC), les plans d’eau, les zones d’extraction, les terrils, les décharges, les Sites à Réaménager (SAR), les zones portuaires ou encore les aérodromes. Le principal inconvénient de cette méthode réside dans le fait que la partie non cadastrée du territoire, qui représente 5% en termes de surface, n’est pas décrite. De même, la carte hérite des imprécisions géométriques du PLI, qui peuvent s’avérer gênantes lorsque la carte est superposée à d’autres couches cartographiques comme les orthoimages. La version 2 de cette COSW est désormais disponible pour l’année de référence 2007. Elle intègre deux améliorations par rapport à la version précédente : 1° La description des espaces non cadastrés. 2° Deux nouvelles couches thématiques interviennent dans le processus de production pour la description des zones de campings et des parcs résidentiels. L’outil de production de cette carte a également été complètement revu, en s’appuyant sur une programmation en VB.NET et en utilisant les géotraitements de la version 9.3 d’ArcGIS. Les données sont désormais gérées dans le format file geodatabase, certaines données intermédiaires utiles aux différentes étapes du processus de production étant stockées dans des personnal geodatabases. La version 2_07 correspondant aux données du PLI et du parcellaire agricole (issu du SIGEC) de 2007 est déclinée en 5 couches correspondant aux 5 niveaux de la légende de la COSW. L’analyse de la précision thématique de la carte est basée sur la photo-interprétation de 1000 points répartis aléatoirement sur l’ensemble du territoire. Elle a concerné le niveau 3 de la légende. La précision globale obtenue pour ce niveau est de 89,1 %. Les confusions les plus fréquentes sont commises entre classes forestières (peuplements feuillus, résineux et mixtes, coupes rases, ..) qui représentent 35 % des erreurs de classification. Les confusions « territoires agricoles vs territoire artificialisés » et « territoires agricoles vs forêts » représentent respectivement 20 % et 17 % des erreurs détectées. L’analyse de la précision géométrique est basée sur la mesure ponctuelle (n = 1000) des discordances entre les limites cartographiées et les limites photo-inteprétées sur les orthoimages de 2006-2007. L’erreur moyenne est de 3,4 m. 70 % des points analysés présentent une erreur inférieure à 4 m. Les limites associées aux zones forestières présentent une erreur moyenne plus importante (5,2 m), par rapport aux limites des espaces agricoles (2,5 m) ou des territoires artificialisés (2,9 m). [less ▲]

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See detailLa valorisation des aliments non conventionnels dans les systèmes d’élevage porcin en RDC
Kambashi Mutiaka, Bienvenu ULg; Boudry, Christelle ULg; Picron, Pascale ULg et al

Conference (2010, October 19)

La volatilité du prix des matières premières fragilise les éleveurs et particulièrement les producteurs d’animaux à cycle court tels que les porcs et les volailles dont l’alimentation est composée de 75 ... [more ▼]

La volatilité du prix des matières premières fragilise les éleveurs et particulièrement les producteurs d’animaux à cycle court tels que les porcs et les volailles dont l’alimentation est composée de 75 % de céréales. La situation est encore plus dramatique dans les pays en développement dont la République démocratique du Congo (RDC) comme en témoignent les émeutes de la faim en 2008. L’alimentation des animaux y entre en concurrence directe avec l’alimentation humaine. Une récente enquête a monté que moins de 2 % des éleveurs du Bas-Congo utilisent un aliment commercial pour porc et que le maïs, la seule céréale disponible localement, est présente dans moins de 10 % des exploitations. Les petits producteurs distribuent aux animaux des fourrages et des sous-produits agro-industriels fibreux pour réduire leurs coûts. Ceci conduit à des rations non équilibrées pour les porcs, induisant une baisse des performances des animaux, des revenus pour les éleveurs et des produits animaux disponibles pour les populations. Néanmoins, en dépit d’inconvénients importants tels qu’une faible densité énergétique et une digestibilité moindre liée à leur teneur en fibres, la présence de facteurs anti-nutritionnels et une conservation plus difficile, la distribution partielle d’aliments fibreux aux porcs peut être économiquement intéressante pour les petits producteurs de la RDC. Comparativement aux céréales, les principaux avantages liés à l’utilisation de ressources fourragères en alimentation porcine sont leur faible coût, la non-compétition avec l’alimentation humaine, l’intégration dans des systèmes de production plus durables que les monocultures (cultures associées, pisciculture, etc.), leur haute teneur en protéines, minéraux et vitamines, leur haute teneur en fibres alimentaires favorisant la santé intestinale et des pertes moindres en azote lors du stockage des lisiers. Ces aliments sont donc une option intéressante pour pérenniser les élevages. Toutefois, les connaissances sur leur valeur alimentaire pour les porcs sont très limitées. Une recherche a été mise en place par le Centre agronomique et vétérinaire de Kinshasa (CAVTK), l’Université de Kinshasa (UNIKIN) et Gembloux Agro-Bio Tech (ULg-GxABT) en vue de caractériser les fourrages utilisés par les éleveurs de Kinshasa et du Bas-Congo et établir des recommandations d’alimentation basées sur des données tangibles telles que l’acceptabilité des ressources fourragères par les animaux ainsi que leur valeur alimentaire. Dans une première phase, 21 fourrages (7 graminées : Brachiaria ruziziensis, Panicum maximum wild cultivar, Panicum maximum var. T58, Pennisetum purpureum, Saccharum officinarum, Trypsacum laxum ; et 14 dicotylées, Acacia mangium, Amaranthus hybridus, Cajanus cajan, Calopogonium muconoides, Centrosema pubescens, Eichornia crassipes, Ipomea batatas, Leucaena leucocephala, Manihot esculenta, Moringa oleifera, Mucuna pruriens, Psophocarpus scandens, Pueraria javanica, Stylosanthes guianensis, Vigna unguiculata) ont été collectés et analysés pour leur composition chimique et leur valeur alimentaire au moyen d’un modèle in vitro du tractus gastro-intestinal du porc incluant une hydrolyse à la pepsine (pH 2, 39°C, 2h) et à la pancréatine (pH 6.8, 39°C, 4h) porcines pour simuler la digestion stomacale et dans l’intestin grêle. Les résidus hydrolysés ont ensuite été fermentés dans un gaz test par un inoculum fécal de porc pour simuler la digestion dans le gros intestin. La digestibilité et la fermentescibilité des ingrédients ont été comparées. Avec une digestibilité in vitro de la matière sèche (DIVMS) de 0.25 à 0.42 et des teneurs en protéines digestibles (PD) de 88 à 101 g/kg, les graminées ont présenté des valeurs alimentaires généralement inférieures aux dicotylées, et particulièrement aux plantes légumineuses, dont DIVMS et PD variaient de 0.25 à 0.56 et de 32 à 247 g/kg, respectivement. Sur base de leur faibles digestibilité (DIVMS de 0.25 à 0.32 ; PD de 32 à 59 g/kg) et fermentescibilité (production de gaz (Gf) de 39 à 196 ml/g à un taux maximal (Rmax) de 1 à 5 ml/g/h), les feuilles d’A. mangium et de C. cajan, E. crassipes et les 2 variétés de P. maximum ne semblent pas intéressantes pour alimenter des porcs. Par contre, les résidus de récolte d’A. hybridus, I. batatas, M. esculenta, P. scandens et V. unguiculata et des espèces fourragères herbacées et ligneuses telles que M. pruriens et M. oleifera, respectivement, semblent prometteuses. Ils combinent des hautes teneurs en énergie digestible estimée via DIVMS (0.43 à 0.56), Gf (155 à 215 ml/g) et Rmax (8 à 18 ml/h/g) à des teneurs élevées en PD (144 à 247 g/kg), Ca (14.5 à 37.0 g/kg) et P (3.4 à 7.8 g/kg). Cependant, avant de généraliser leur recommandation auprès des fermiers, il convient de vérifier les taux d’incorporation dans les régimes via des expériences de digestibilité et de croissance sur porcs car certaines de ces espèces contiennent des facteurs antinutritionnels tels que des glucosides cyanogénétiques, des lectines ou des facteurs antitrypsiques, réduisant leur digestibilité in vivo ou l’ingestion volontaire par les animaux. [less ▲]

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See detailElectron-atmosphere interaction in the aurora of giant planets
Gérard, Jean-Claude ULg

Conference (2010, October 18)

All methods converge to indicate that the efficiency of the H2 (B,C states) emission is close to 10 kR/mW m-2 of electron precipitation. The UV aurora is a direct instantaneous map of the distribution of ... [more ▼]

All methods converge to indicate that the efficiency of the H2 (B,C states) emission is close to 10 kR/mW m-2 of electron precipitation. The UV aurora is a direct instantaneous map of the distribution of the electron precipitation. By contrast, the IR H3+ aurora is indirectly produced and its intensity depends on the amount of H3+ ions and the local temperature. It has the advantage to be observable from the ground The «UV color ratio » method is a powerful tool to probe the electron mean energy IF the distribution of HCs (mostly methane) is known EUV spectroscopy is very useful to determine the depth of the electron energy deposition, but so far, without spatial resolution [less ▲]

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See detailÉtude de l’impact du trac sur la voix de 26 étudiants en situation d’examen de solfège.
Morsomme, Dominique ULg; Ficarrotta, Eva

Conference (2010, October 18)

Les manifestations du trac sont physiques, cognitives et comportementales. Elles varient selon le genre, la tâche et le public. Notre étude tente de les mettre en évidence chez 26 étudiants produisant un ... [more ▼]

Les manifestations du trac sont physiques, cognitives et comportementales. Elles varient selon le genre, la tâche et le public. Notre étude tente de les mettre en évidence chez 26 étudiants produisant un morceau « a capella » pendant leur examen de solfège. 4 mois avant l’examen (T1), le jour avant (T2) et le jour de l’examen (T3), chaque étudiant a évalué son degré de nervosité, complété les échelles de Cungi et expliqué sa stratégie de coping. Des mesures objectives ont été relevées. Au T3, 3 experts dont une logopède les ont notés. Tous les sujets obtiennent des résultats significativement plus élevés au T3 pour leurs degrés de nervosité et l’intensité. Les notes des juges sont corrélées à celle de la logopède (rho: 0,71/0,79). Au T3, plus les femmes évaluent hautement leur nervosité, plus le juge 2 l’évalue hautement également (rho: 0,84). Plus les scores aux échelles de Cungi sont élevés plus le degré de perfectionnisme l’est aussi (rho: 0,87; 0,81; 0,57). Plus le temps d’exécution du morceau est long, plus les notes attribuées par les juges sont faibles (rho: -0,69). Au T3, plus les hommes ont un degré de nervosité élevé plus les juges perçoivent du trac, plus les scores à l’échelle de Cungi et leur degré de perfectionnisme sont élevés (rho:0,69/ 0,65/ 0,72/ 0,68). Plus le Jitter augmente, plus la perception du trac par le juge 2 est élevé (rho: 0,68). Plus le HNR augmente, plus le degré de trac attribué par les juges est important (rho: 0,71) et plus la note de la logopède est faible (rho : -0,71). Plus le Jitter est élevé, plus les notes des 3 juges sont faibles (rho:-0,78/-0,79). 73 % des étudiants utilisent un coping cognitivo comportemental et 16 % une stratégie médicamenteuse. Le trac se manifeste mais différemment en fonction du genre. [less ▲]

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See detailValidation d'un double questionnaire (enfant/parent) pour l'évaluation subjective de la voix chez l'enfant.
Verduyckt, Ingrid; Morsomme, Dominique ULg; Ferrara, Tamara et al

Conference (2010, October 18)

Contexte L’auto-évaluation des symptômes vocaux et de leur impact sur la vie quotidienne fait aujourd’hui partie de l’évaluation de la dysphonie. Pour les adultes, nous disposons de questionnaires validés ... [more ▼]

Contexte L’auto-évaluation des symptômes vocaux et de leur impact sur la vie quotidienne fait aujourd’hui partie de l’évaluation de la dysphonie. Pour les adultes, nous disposons de questionnaires validés (Woisard et al 2004, Morsomme et al 2005), il n’existe pas d’équivalent pour les enfants.Notre objectif est la validation d’un questionnaire dont la création à déjà fait l’objet d’une publication (Verduyckt et al, 2010) . Méthode Passation du questionnaire sur un mode test-retest (Enfants : N 168 (5,5 – 12,7 ans), Parents : N 118). La population est divisée en trois sous-groupes : 1. Dysphoniques avec plainte vocale (DAP), N : 27 enfants 2. Dysphoniques sans plaintes vocales (DSP), N : 22 enfants 3. Normophoniques (NP), N :73 enfants Résultats Nous observons une bonne cohérence interne Alpha de Cronbach >.85 ainsi qu’une fiabilité test-retest élevée: Pearson’s r : .68 (enfants) et .84 (parents), (p<.05) et une corrélation bonne à élevée entre le score total et la question adressant spécifiquement la présence d’un problème vocal ( Spearman’s r : .54 (enfants) et r :.64 (parents) (p<.05)). Nous observons également une différence significative entre le score total des trois sous-groupes pour les parents (DAP = DSP > NP) (p <.05). La corrélation entre les scores enfants et parents est faible (Pearson’s r <.25) et il existe une différence significative entre leurs scores totaux : enfants > parents (p<.05). Conclusions Notre questionnaire s‘est montré valide et fiable. Il est sensible avant tout aux plaintes des parents d’enfants dysphoniques. L’utilité d’un questionnaire qui s’adresse d’une part aux enfants et d’une part aux parents est confirmée, les réponses parentales n’étant que faiblement corrélées aux réponses des enfants et significativement différentes. [less ▲]

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See detailImpact of vocal load during a prolonged reading task with specific emphasis on the output level
Remacle, Angélique ULg; Roche, Anne ULg; Finck, Camille ULg et al

Conference (2010, October 18)

La charge vocale se définit comme la quantité d'utilisation vocale en termes de durée et d'intensité vocale. Dans cette étude, nous tentons d'étudier la charge vocale selon ces deux aspects. Pour ce faire ... [more ▼]

La charge vocale se définit comme la quantité d'utilisation vocale en termes de durée et d'intensité vocale. Dans cette étude, nous tentons d'étudier la charge vocale selon ces deux aspects. Pour ce faire, nous avons proposé une tâche de lecture à 50 femmes non fumeuses, âgées de 22 à 47 ans, chez qui l'examen phoniatrique a exclu la présence de toute pathologie vocale. L'impact de la durée de l'utilisation vocale a été étudié à l'aide de récoltes de mesures toutes les 30 minutes, au cours d'une lecture de deux heures. Nous avons réalisé des mesures objectives (Fréquence fondamentale, Jitter %, Shimmer %, Noise-to-Harmonic Ratio, étendue fréquentielle, dynamique d'intensité, temps maximum de phonation) ainsi qu'une auto évaluation sur une échelle visuelle analogique (qualité vocale, sensation d'effort, de fatigue et d'inconfort laryngé au cours de la lecture). Afin de mettre en évidence l'effet de l'intensité, chaque participante a réalisé deux fois la tâche de deux heures de lecture, à minimum trois jours d'intervalle afin de permettre la récupération entre les deux conditions de test. Une première fois à intensité conversationnelle (entre 60 et 65 dB), une seconde fois à intensité élevée (entre 70 et 75 dB). L'objectif était d'étudier les modifications liées à la durée et à l'intensité de l'utilisation vocale ainsi que l'impact de l'échauffement et de la fatigue vocale sur les paramètres étudiés. [less ▲]

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