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See detailEquating the Chilean university entrance exam
Magis, David ULg; Janssen, Rianne; San Martin, Ernesto et al

Conference (2007, November)

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See detailQuelques idées saussuriennes chez Jorge Luis Borges
Sofia, Estanislao ULg

Conference (2007, October 30)

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See detailNovel pH or thermosensitive block copolymers for triggered drug-delivery systems
Jérôme, Christine ULg

Conference (2007, October 30)

Over the last decade, polymer micelles and nanoparticles have attracted an increasing interest as efficient drug delivery systems. Polymer micelles from amphiphilic block copolymers are supramolecular ... [more ▼]

Over the last decade, polymer micelles and nanoparticles have attracted an increasing interest as efficient drug delivery systems. Polymer micelles from amphiphilic block copolymers are supramolecular core-shell type assemblies of some tens of nanometers in diameter. They are highly stable in aqueous solution because of their low intrinsic critical micelle concentration, which prevents their dissociation upon dilution in the blood stream after intravenous injection. The combination of poly(ethylene oxide) (PEO) with hydrophobic aliphatic polyesters, such as poly(ε-caprolactone) (PCL) or polylactide (PLA), allows to prepare stealthy drug nanocarriers (thanks to PEO), which are biodegradable and biocompatible and capable of encapsulating a hydrophobic drug (due to the aliphatic polyester). In this field, the inclusion of an additional pH-responsive block in the supramolecular assembly is a promising strategy to improve the targeting of tumor tissues by taking advantage of the lower pH at the vicinity of tumor cells. A variety of novel amphiphilic and pH-sensitive copolymers have been synthesized and tested as building blocks for the design of smart nanocarriers able to expose selectively the targeting unit at the vicinity of tumor. Various macromolecular architectures combining PEO, PCL and P2VP have been accordingly synthesized such as linear and star shape di- and triblock copolymers. Their (co)-micellization has been studied in terms of size, particle shape (DLS, TEM) and stealth behavior. Besides, thermo-responsive copolymers combining PEO, polyacrylic acid and poly-N-isopropyl-acrylamide have been synthesized and found efficient in stabilizing stealthy magnetic nanoparticles promising for thermally triggered release of drugs during hyperthermia. [less ▲]

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See detailL'impact de la production de viande traditionnelle sur l'environnement
Beckers, Yves ULg

Conference (2007, October 27)

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See detailLe catholicisme baroque : historiographie et nouveaux enjeux
Delfosse, Annick ULg

Conference (2007, October 26)

Detailed reference viewed: 16 (2 ULg)
See detailFood Chain Security and Vulnerability: Belgian Case Study
Brunet, Sébastien ULg; Fallon, Catherine ULg

Conference (2007, October 25)

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See detailLa procalcitonine: un marqueurs d'infection bactérienne
Chapelle, Jean-Paul ULg

Conference (2007, October 25)

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See detailAby Warburg, science du détail et éléments secondaires
Hagelstein, Maud ULg

Conference (2007, October 25)

C’est à l’historien de l’art juif allemand Aby Warburg (1866-1929) que l’on prête généralement la formule : « Le bon Dieu niche dans les détails » (Der liebe Gott steckt im Detail) . Au vu de ses ... [more ▼]

C’est à l’historien de l’art juif allemand Aby Warburg (1866-1929) que l’on prête généralement la formule : « Le bon Dieu niche dans les détails » (Der liebe Gott steckt im Detail) . Au vu de ses multiples implications pour la théorie de l’art, le trait d’esprit semble n’avoir rien perdu de son actualité. Aussi s’agira-t-il d’entreprendre ici une réflexion sur la portée méthodologique de l’attention extrême que le travail de Warburg réserve aux détails. Par « détails », on peut entendre aussi bien les éléments singuliers se découpant au sein des œuvres que, de manière plus générale, les aspects secondaires (ou jugés tels) de la culture. Warburg accorde le même soin aux détails de l’image qu’aux détails de l’histoire. Parmi d’autres innovations, l’apport majeur de l’historien de l’art hambourgeois a peut-être été d’ouvrir la sphère des Beaux-Arts à son « dehors », à une série d’objets théoriques habituellement laissés de côté en raison de leur insignifiance supposée. Pour Warburg, une œuvre d’art reste illisible sans l’effort qui consiste à la replacer dans le tissu culturel dont elle a émergé. Il ne négligeait aucun document : lettres, actes de naissance, contrats, bons de commande, testaments, horoscopes, etc. Gertrud Bing, qui fut son assistante, confirmait d’ailleurs sa manière inimitable de faire parler les documents apparemment anodins. La lecture des images elles-mêmes faisait l’objet d’une généreuse méticulosité. Dès sa dissertation de 1893, consacrée à deux œuvres majeures de Botticelli (La Naissance de Vénus et Le Printemps), Warburg accorde un vif intérêt à la représentation des éléments secondaires (chevelures, drapés, etc.) et du mouvement qui les traverse. À partir de cette analyse « locale » de l’œuvre botticellienne, il développe déjà l’un des points essentiels de sa vision de l’histoire et de la culture. On tentera donc de montrer en quoi le détail constitue chez Warburg un passage obligé vers l’élaboration d’une théorie générale, tout en la menaçant toujours. [less ▲]

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See detailNatural and projectively equivariant quantizations
Radoux, Fabian ULg

Conference (2007, October 21)

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See detailMondialisation et déclin de la puissance de l'Etat
Pâques, Michel ULg

Conference (2007, October 19)

La souveraineté de l'Etat lui donne la puissance de régler toute question dans la sphère étatique et de corriger le jeu des forces du marché au profit d'autres intérêts. L'absence de souveraineté à l ... [more ▼]

La souveraineté de l'Etat lui donne la puissance de régler toute question dans la sphère étatique et de corriger le jeu des forces du marché au profit d'autres intérêts. L'absence de souveraineté à l'échelle mondiale empêche le réglement équivalent des questions qui échappent au cadre étatique. La mondialisation d'une question entraîne une difficulté de réglementation et de correction des forces du marché au profit d'autres intérêts. La mondialisation et le déclin de la puissance de l'Etat sont liés. [less ▲]

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See detailLinearizing Option Returns for Portfolio and Risk Management
Bodson, Laurent ULg; Hübner, Georges ULg

Conference (2007, October 18)

This paper proposes a method to deduce the first four moments and the co-moments (with any other asset) of an option return. We consider the dynamics of an option-replicating portfolio of four basic ... [more ▼]

This paper proposes a method to deduce the first four moments and the co-moments (with any other asset) of an option return. We consider the dynamics of an option-replicating portfolio of four basic assets: the underlying, two long-term options and a zero coupon bond. This approach allows us to capture the moments up to order four of the underlying and to linearize the option return. A numerical example illustrates some of the features and applications of this model. [less ▲]

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See detailUsing survey data to resolve the exchange risk exposure puzzle
Muller, Aline ULg; Jongen, Ron; Verschoor, Willem

Conference (2007, October 17)

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See detailQualitative Spatio-Temporal Reasoning & Spatial Database Design
Donnay, Jean-Paul ULg; Hallot, Pierre ULg; Laplanche, François

Conference (2007, October 17)

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See detailAdaptation du Voice Handicap Index à la voix chantée
Morsomme, Dominique ULg; Gaspar, Martine; Jamart, Jacques et al

Conference (2007, October 16)

Le V.H.I. de Jacobson et al. ne traduit pas les difficultés éprouvées par le chanteur. L’étude présentée ici est l’aboutissement de 5 travaux visant à l’adaptation de l’index à la voix chantée. Chaque ... [more ▼]

Le V.H.I. de Jacobson et al. ne traduit pas les difficultés éprouvées par le chanteur. L’étude présentée ici est l’aboutissement de 5 travaux visant à l’adaptation de l’index à la voix chantée. Chaque étude a évalué la fiabilité et la cohérence des items. Morsomme et Gaspar ont proposé une nouvelle version dont les items ont été reformulés dans le but de rendre cet outil accessible à tous les chanteurs dysodiques ou non. Nous avons évalué la fiabilité et la cohérence interne de cette dernière mouture, sur une population de 192 chanteurs classiques et 27 non chanteurs. Pour la validation de l’échelle, la comparaison des scores moyens aux deux tests montrent que les résultats du retest est significativement inférieurs pour la sous échelle fonctionnelle (p=0.013) et le score global (p=0.006). Nous observons une bonne stabilité test/retest (ICC: E Fonctionnelle:0.869, E Emotionnelle: 0.846, E Physique: 0.85, Score Global: 0.878/ Rho de Spearman F: 0.855, E: 0.834, P: 0.858, G: 0.886). La cohérence interne de chaque sous échelle (Cronbach’s alpha) est bonne (>0.80). Les corrélations entre les 3 sous échelles sont assez élevées (FvsE: 0,613 /EvsP: 0,737/ FvsP: 0,693). Chaque sous échelle mesure une dimension particulière tout en restant homogène entre-elles. La différence test-retest entre les chanteurs et les contrôles est non significative. Au test de Levene le groupe contrôle a une plus grande variabilité de réponses pour le score globale (p=0.02), les E fonctionnelle (p<0 .001) et physique (p=0.009). Trois variables font augmenter significativement les résultats: être soliste (F:p=0.046; E: p=0.002; P: p=0.056; G: p=0.006), être amateur (F:p<0.001; E: p=0.019; P: p<0.001; G: p=0.001), et avoir une plainte vocale (F, E, P et G: p<0.001). En conclusion, le V.H.I. adapté aux chanteurs se révèle fiable, valide et adapté à la population de chanteurs classiques. [less ▲]

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See detailNatural and projectively equivariant quantizations
Radoux, Fabian ULg

Conference (2007, October 13)

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See detailLa valeur philosophique de la psychanalyse lacanienne
Gyemant, Maria ULg

Conference (2007, October 13)

Detailed reference viewed: 8 (0 ULg)
See detailDensité Minérale Osseuse et risque fracturaire : une relation prédictive?
Bruyère, Olivier ULg

Conference (2007, October 13)

Detailed reference viewed: 4 (1 ULg)
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See detailLongitudinal study to explain early exit : work or quality of life ?
Bertrand, Françoise ULg; Schreurs, B.; Tibax, V. et al

Conference (2007, October 12)

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See detailInteraction between human papillomavirus (HPV) and natural killer (NK) cells
Renoux, Virginie ULg; Longton, Laurence; Dortu, Estelle ULg et al

Conference (2007, October 10)

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See detailLe théâtre à Liège, aperçu critique
Delhalle, Nancy ULg

Conference (2007, October 06)

Detailed reference viewed: 22 (6 ULg)
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See detailUS/India Civil Nuclear Cooperation Initiative: the Question of Safeguards
Michel, Quentin ULg

Conference (2007, October 04)

Detailed reference viewed: 4 (1 ULg)
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See detailMicro-technology for space mission
Loicq, Jerôme ULg

Conference (2007, October 03)

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See detailThe lifetime of bouncing droplets
Terwagne, Denis ULg; Vandewalle, Nicolas ULg; Dorbolo, Stéphane ULg

Conference (2007, October)

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See detailVoice disorders post thyroid surgery
FINCK, Camille ULg

Conference (2007, October)

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See detailAssessment of Lake Sediment Sensitivity along the North Anatolian Fault
Boes, Xavier; Ulas, Avsar; King, J et al

Conference (2007, October)

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See detailLandscape and participation: construction of a PhD research problem and an analysis method. Towards the comparative analysis of participatory processes of landscape management projects design on a local scale in the Walloon region (Belgium)
Droeven, Emilie ULg

Conference (2007, October)

A preliminary reflection to the definition of a PhD research problem on the concepts of participation, landscape and project, led the student to be interested in the participatory processes of landscape ... [more ▼]

A preliminary reflection to the definition of a PhD research problem on the concepts of participation, landscape and project, led the student to be interested in the participatory processes of landscape management projects design, and in the inhabitants landscapes representations. The method includes the comparative analysis of local processes of projects design, and the direct observation of two Walloon landscape management projects design (investigation conducted with stakeholders implied in the project design and among inhabitants, direct observation, organisation of participative meeting-debates. Fitting her research approach within the field of the territorial participative research-action, the PhD student assumes that the participation of the territorial actors and the population can “feed” the scientific research as well as territorial action. She reconsiders moreover some difficulties encountered in her research. [less ▲]

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See detailDevelopment of original pyridinic analogues of nimesulide as cycloxygenase inhibitors
Renard, Jean-François ULg; de Leval, Xavier; Pirotte, Bernard ULg

Conference (2007, October)

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See detailEst-ce qu'il est possible d'obtenir le résultat véritable d'un élève même si celui-ci tente de tricher ?
Raîche, Gilles; Blais, Jean-Guy; Magis, David ULg

Conference (2007, October)

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See detailStudies in medical context: methodology and case studies
Blavier, Adelaïde ULg

Conference (2007, October)

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See detailLaboratory, field and airborne spectroscopy for monitoring organic carbon content in agricultural soils
Stevens, A.; van Wesemael, B.; Tychon, Bernard ULg et al

Conference (2007, October)

This study explains the potential and the limits of a field ASD spectrometer and a CASI airborne instrument to assess the Soil Organic Carbon, in the context of soil carbon mapping.

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See detailStudy of VOC and odour emissions during the convective drying of urban residual sludges
Léonard, Angélique ULg; Martin, Georges; Nicolas, Jacques ULg et al

Conference (2007, October)

Detailed reference viewed: 36 (22 ULg)
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See detailPlan de gestion de la diversité : la difficile construction des indicateurs?
Cornet, Annie ULg; Warland, P.

Conference (2007, October)

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See detailThrombin activity profile: a rapid, reliable and relevant ex vivo screening test for the development of anticoagulant drugs
Robert, S.; Ghiotto, J.; Pirotte, Bernard ULg et al

Conference (2007, October)

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See detailQuick data set generation and exact P-value computation in goodness-of-fit testing
Magis, David ULg

Conference (2007, October)

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See detailDesign, synthesis, and pharmacological evaluation of cromakalim analogues as pancreatic β-cell-selective KATP channel openers
Florence, X.; De Tullio, Pascal ULg; Lebrun, Ph. et al

Conference (2007, October)

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See detailUna proyección sintética para el diseño arquitectónico con la luz del sol
Benoit, Beckers; Masset, Luc ULg; Beckers, Pierre ULg

Conference (2007, October)

Detailed reference viewed: 112 (16 ULg)
See detailAssurance-vie et planification patrimoniale
Leleu, Yves-Henri ULg

Conference (2007, October)

Detailed reference viewed: 61 (4 ULg)
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See detailDesign, synthesis and anticancer activity of novel hydroxylated coumarin derivatives
Hemmer, Marc ULg; De Tullio, Pascal ULg; Bernard, Y. et al

Conference (2007, October)

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See detailPolymer (PE) synthesis - scaling up to industrial scale
Detrembleur, Christophe ULg

Conference (2007, September 30)

Detailed reference viewed: 12 (1 ULg)
See detailJuvenile delinquency and gender issues
Gavray, Claire ULg

Conference (2007, September 28)

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See detailIntertextual Transformations in the Work of Janet Frame
Delrez, Marc ULg

Conference (2007, September 27)

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See detailPrevention of GBS perinatal infections: guidelines and update
Melin, Pierrette ULg

Conference (2007, September 27)

Detailed reference viewed: 9 (1 ULg)
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See detailAmphibia-Reptilia: Editorial report 2005-2007
Denoël, Mathieu ULg

Conference (2007, September 22)

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See detailSocial dialogue in Europe: reason and method of the transnational comparison
Orianne, Jean-François ULg

Conference (2007, September 20)

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See detailLe gender mainstreaming et le gender budgeting en Belgique
Cornet, Annie ULg

Conference (2007, September 19)

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See detailRole of masks, caps, gowns and skin disinfection
Brichant, Jean-François ULg

Conference (2007, September 15)

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See detailTransgression sexuelle à l’adolescence : un passage à l’acte sexuel dans le parcours de la délinquance ou un passage à l’acte délinquant dans le parcours sexuel de ces adolescents ?
Glowacz, Fabienne ULg

Conference (2007, September 14)

Depuis quelques années, en Belgique, notre pratique d’expert judiciaire rend compte d’une augmentation des signalements et de plaintes d’abus sexuel à l’encontre d’adolescents ainsi que de l’abaissement ... [more ▼]

Depuis quelques années, en Belgique, notre pratique d’expert judiciaire rend compte d’une augmentation des signalements et de plaintes d’abus sexuel à l’encontre d’adolescents ainsi que de l’abaissement de l’âge de ces adolescents suspectés de tels agissements sur des enfants pré-pubères ou des pairs. Si ces adolescents ont en commun cette transgression sexuelle qui prend diverses formes, tous les auteurs ( Worling, 2001, Barbaree and Marshall, 2006, Hunter J.A., Figueredo A.J., Malamuth N.M. & Becker J.V., 2003 …) s’accordent sur le fait que ces adolescents et pré-adolescents forment un groupe hétérogène au niveau de leur mode de fonctionnement psychologique, social et sexuel, et au niveau de leur engagement dans la délinquance. Dans le cadre de notre communication, à partir des données préliminaires d’une recherche portant sur le fonctionnement psychologique et psycho-social de ces pré-adolescents et adolescents, et d’une présentation de vignettes cliniques, nous développerons les différentes formes de passages à l’acte transgressif au niveau sexuel selon l’âge des adolescents et l’âge des victimes, et nous tenterons de comprendre l’inscription de cet acte au niveau du de développement psycho-social de l’adolescent et de son engagement dans la délinquance. Une analyse plus spécifique portera sur le mode de consommation pornographique de ces mineurs « transgresseur sexuel » qui sera comparé au mode de consommation pornographique d’un échantillon d’adolescents et adolescentes non délinquants et à un groupe d’adolescents et adolescentes délinquants. [less ▲]

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See detailPeptides entrapped in biodegradable PLGA microparticles accelerate tissue repair at gastric ulcer treatment in rats
Markvicheva, E; Stashevskaya, K; Prudchenko, I et al

Conference (2007, September 09)

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See detailExploring the Formation Pathways of DNA G-Quadruplex Architectures
Rosu, Frédéric ULg; Poncelet, Harmonie; Teulade-Fichou, Marie-Paule et al

Conference (2007, September 07)

Guanine-rich DNA strands can form the so-called G-quadruplex architectures due to the formation of quartets of guanines linked by 8 hydrogen bonds. G-quadruplexes are further stabilized by the inclusion ... [more ▼]

Guanine-rich DNA strands can form the so-called G-quadruplex architectures due to the formation of quartets of guanines linked by 8 hydrogen bonds. G-quadruplexes are further stabilized by the inclusion of cations between the G-quartets. The abundance of G-rich regions throughout the genome and their very presence in telomeric regions made G-quadruplexes interesting targets. NMR and crystallographic studies of G-quadruplex structures revealed amazing variety in the G-quadruplex topologies. The next challenge will be to understand the rules governing the formation of the various topologies, in order to predict relevant G-quadruplexes in the genome, and in order to act rationally on their formation or disruption. To date, only few experimental [1] or theoretical [2] studies have been devoted to investigating the mechanisms of G-quadruplex formation. We report here a detailed investigation of DNA G-quadruplex formation pathways using electrospray mass spectrometry (ESI-MS). The sequences TGnT (n = 3-6) were purchased from Eurogentec (Seraing, Beliugm). ESI-MS experiments were performed in the negative ion mode on a Q-TOF Ultima Global (Waters, Manchester, UK). The cation used was ammonium (up to 150 mM). Experiments were performed in the presence and absence of methanol (up to 20%) as co-solvent. ESI-MS allows counting both the number of strands and the number of cations in each intermediate. We could confirm the presence of transient dimer and trimer intermediates in low abundance. More unexpectedly, ESI-MS also reveals unambiguously the formation of pentamers which contain ammonium cations. The pentamers slowly convert into tetramers. Counting the number of included cations also revealed that, in the case of (TG6T)4, inclusion of four ammonium cations is fast, while the inclusion of the last ammonium ion is very slow. We also found that the addition of methanol (initially added to obtain higher ion intensities) significantly increases the rate of G-quadruplex formation. Finally, we also investigated the role of G-quadruplex ligands in the rate of formation of G-quadruplexes. We could classify the ligands according to their increase of G-quadruplex formation kinetics, and distinguish the intermediates. Interestingly, one ligand showed formation of a higher-order structure by bridging two G-quadruplexes. Acknowledgement: The authors thank the FRS-FNRS for their support. References: [1] J. Gros et al., Nucleic Acids Res., 2007, doi:10.1093/nar/gkm111. [2] R. Stefl et al., Biophys. J., 2003, 85(3), 1787-1804. [less ▲]

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See detailState of the Art in Spinal Cord Injury – Research and Clinical Application
Martin, Didier ULg

Conference (2007, September 06)

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See detailNew Data on Political Interest and Participation of the Young People (16-18 y. old) in Liège, Belgium
Fournier, Bernard ULg; Reuchamps, Min ULg

Conference (2007, September 06)

In 1990, one of us administered a questionnaire to 640 students from nine high schools in Liège (Belgium) and its suburb. The survey aimed at measuring the political interest of the youth and their level ... [more ▼]

In 1990, one of us administered a questionnaire to 640 students from nine high schools in Liège (Belgium) and its suburb. The survey aimed at measuring the political interest of the youth and their level of participation in a wide range of associations. The questionnaire, which was also administered in Quebec and Paris, was made of 200 other indicators (confidence toward the institutions, impact of the political decisions, role of the state, etc.). Last spring, we administered a similar questionnaire to the same schools in order to compare the data gathered in our previous researches and the new data. The comparison will engage the oft-asked questions in the field about political participation—or its decline—amongst the youth. The new data show, as in 1990, that approximately two-thirds of the students (16-18 years old) participate in associational life in a broad sense. Political participation sensu stricto is still less popular than participation in organisations campaigning for the defence of human rights or the environment. We also observe significant differences in the traditional sociological categories. Yet, as we did for the 1990 data, we shall move our analysis beyond the usual sociological categories in order to stress the internal differences between groups. As such, we shall privilege the analysis in terms of classifications. With a more precise image of the various forms of participation as well as the attitudes related to it, different patterns will characterise young people’s participation. Accordingly, our understanding of the political socialisation’s mechanisms will be adapted. Such an inquiry seems necessary in order to engage the traditional views on political participation and interest of today’s youth. [less ▲]

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See detailMacromolecular engineering of cyclic aliphatic polyesters by ring-opening polymerization and "click" chemistry
Lecomte, Philippe ULg; Li, Haiying; Riva, Raphaël ULg et al

Conference (2007, September 04)

The last decades have witnessed a steadily increasing progress in the macromolecular engineering of the main families of synthetic polymers. Ring-shaped copolymers show a unique topology due to the ... [more ▼]

The last decades have witnessed a steadily increasing progress in the macromolecular engineering of the main families of synthetic polymers. Ring-shaped copolymers show a unique topology due to the absence of any chain-end and exhibit distinct properties from their linear counterparts, such as glass transition temperature, order-disorder transition, reduced viscosity, lower hydrodynamic volumes. This communication aims at reporting on a novel route to biodegradable cyclic polyesters. Our strategy is based on the work of Prof. Kricheldorf who initiated the ring-opening polymerization of ε-caprolactone by cyclic tin dialkoxides, e.g., 2,2-dibutyl-2-stanna-1,3-dioxepane (DSDOP) in order to obtain “living” macrocyclic PCL, still containing two endocyclic tin-oxygen bonds. In this work, the resumption of polymerization by a few units of ε-caprolactone substituted by an acrylic unit, e.g., 1-(2-oxooxepan-3-yl)ethyl prop- 2-enoate, followed by intramolecular photo-crosslinking of pendant unsaturations and finally by hydrolysis gave rise to macrocyclic PCL. As a rule, this strategy is very well-suited for the synthesis of high molecular weight PCL. Moreover, tin alkoxides were kept untouched after the cross-linking step and remained thus available for further macromolecular engineering. The process was extended to the synthesis of other architectures such as sun-shaped, two-tail tadpoleshaped, and eight-shaped copolyesters. The second part of the lecture, it will be shown that the copper(I)-catalyzed Huisgen’s [3+2] cycloaddition, which is the most popular “Click" reaction, is very efficient to graft alkynes, duly substituted by functional groups or chains, onto aliphatic copolyesters bearing pendant azides. Interestingly enough, mild conditions were found and no degradation was observed during the “click” derivatization of copolyesters of PCL. The “click” reactions of alkynes onto pendant azides of copolyesters of PLA, by far more sensitive than PCL, was also successfully carried out without any detectable degradation. ”Click” chemistry is very versatile because this reaction was successfully implemented to graft functional groups or chains directly onto ω-azido-ε-caprolactone, without any ring-opening of the lactone, in order to make available a new range of functional caprolactones. Finally, the “click” grafting of PEO onto the tails of tadpole-shaped copolymers will be shown to be a route to amphiphilic copolymers with an original architecture. [less ▲]

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See detailPlanktonic Archaea in Lake Kivu
Llirós, Marc; Darchambeau, François ULg; Plasencia, Anna et al

Conference (2007, September 02)

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See detailLearning at school, learning at labour. Some differences, some inequalities
Andre, Géraldine ULg

Conference (2007, September)

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See detailL’entreprise à l’envers comme nouvel outil de restructuration : la GRH face à ses paradoxes
Deflandre, Dimitri; Xhauflair, Virginie ULg

Conference (2007, September)

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See detailAeroacoustics coupling of a misaligned jet-slot-oscillator with non-planar modes of a resonator
Glesser, Martin; Billon, Alexis ULg; Valeau, Vincent et al

Conference (2007, September)

The impingement of a plane jet on a slotted plate produces a “jet-slot oscillator” emitting acoustic tones. The coupling of such tones with high-order acoustic resonances of the flow-supply duct (i.e ... [more ▼]

The impingement of a plane jet on a slotted plate produces a “jet-slot oscillator” emitting acoustic tones. The coupling of such tones with high-order acoustic resonances of the flow-supply duct (i.e., above the first transverse mode cut-off frequency) is studied experimentally , in the particular case where the jet-exit and the obstacle are misaligned in the spanwise direction. An experimental set-up based on microphones and hot-wire probes is used to investigate the effect of the slot angle on the sound production mechanism. The aligned jet-slot oscillator is first studied, showing that the parallelism between the jet exit and the slot imposes the excitation of planar modes of the resonator only. Conversely, the misaligned jet-slot oscillator appears to be coupled with a combination of planar and transverse modes. The induced spanwise variation of the acoustic field phase has two consequences. First, it compensates the difference of vortices convection time in the spanwise direction, due to the obstacle misalignment. Second, it enhances the spanwise coherence of the aeroacoustic source produced by the jet-slot interaction: the vortex-tubes are shed in an oblique direction which tends to be parallel to the obstacle. [less ▲]

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See detailLa dysphonie, diagnostic et traitements
FINCK, Camille ULg

Conference (2007, September)

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See detailDiffusion-based models for predicting sound fields in rooms with mixed specular and diffuse reflection
Foy, Cédric; Billon, Alexis ULg; Valeau, Vincent et al

Conference (2007, September)

A diffusion model, based on the numerical solution of a diffusion equation, was developed in the past to give accurate predictions of the sound-pressure level and of the sound decay at any location in a ... [more ▼]

A diffusion model, based on the numerical solution of a diffusion equation, was developed in the past to give accurate predictions of the sound-pressure level and of the sound decay at any location in a single enclosure or in coupled rooms. However, this model is limited to rooms with diffusely reflecting walls. In this study, two methods are presented to extend this model to rooms with mixed specular and diffuse reflections, defined by the classical room-acoustics scattering coefficient. The first method models the reverberant field by using a modified diffusion process, with an empirical diffusion constant departing from the theoretical one based on the mean free path. The set of these coefficients, which depend on the scattering coefficient, has been found empirically to fit the results given by a ray-tracing program. The second method is a hybrid approach. The reverberant sound field due to the diffuse reflections is first obtained with the original diffusion model. Then the sound field due to the specular reflections is modelled with an image-source model. The results given by the two approaches are compared to experimental data obtained for several types of rooms (a classroom, an office and some long rooms). [less ▲]

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See detailCO emissions of fuel oil boilers in transient and cyclic regimes: performance of burners without and with “antidrip” systems
Makaire, Danielle ULg; Ngendakumana, Philippe ULg

Conference (2007, September)

CO emission peaks from fuel oil boilers in transient and cyclic regimes have been measured in previous studies. In order to evaluate these emissions, tests have been performed without and with an anti ... [more ▼]

CO emission peaks from fuel oil boilers in transient and cyclic regimes have been measured in previous studies. In order to evaluate these emissions, tests have been performed without and with an anti-drip system installed on the burner nozzle. Flue gas composition was measured using classical analysers (CO2, O2, CO and NOx) and CO emissions results were analysed and discussed. It was found that the anti-drip system reduced cold start CO emissions and did not affect steady-state CO emissions. At first, no reduction was noticed when the burner was cycling. Further investigation indicated that there was an experimental artefact caused by an air volume trapped in the pressure measurement system. When the air was purged and with the anti-drip system, CO peaks when the burner was cycling were strongly reduced and CO emissions remained under European standards limits. [less ▲]

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See detailHeat Pumping and Reversible Air Conditioning: Retrofit opportunities in a laboratory building
Aparecida Silva, Cleide; Bertagnolio, Stéphane ULg; Hannay, Jules et al

Conference (2007, September)

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See detailFeasibility study of the diluted combustion in a semi-industrial boiler at low temperatures
Seggio, Giovanni; Ngendakumana, Philippe ULg; Pesenti, Barbara et al

Conference (2007, September)

The aim of this work is to assess the technical feasibility and highlight the specific problem of application of diluted (or mild) combustion in a medium scale boiler by direct gas injection. The main ... [more ▼]

The aim of this work is to assess the technical feasibility and highlight the specific problem of application of diluted (or mild) combustion in a medium scale boiler by direct gas injection. The main difficulty is due to the high geometrical confinement and heat losses of a typical boiler combustion chamber, which prevents from getting the minimum level of reactants dilution and temperature needed to reach mild combustion regime. Last year, a preliminary CFD study was performed to select a jet burner and secondary gas injector able to generate sufficient dilution and temperature of the air and gas jets before they meet in the combustion chamber of the boiler. In this work, the optimization of the position and the diameter of the gas injector has been performed. Finally, the boundary conditions and the parameters of the combustion model have been investigated. [less ▲]

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See detailCondizioni per una tipologia dei discorsi universitari
Defays, Jean-Marc ULg

Conference (2007, September)

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See detailThe business failure process : towards an integrative model of the literature
Crutzen, Nathalie ULg; Van Caillie, Didier ULg

Conference (2007, September)

Considering the fragmented literature dedicated to business failure prevention and considering the need for a unifying conceptual framework on how and why companies fail, the aim of this paper is to ... [more ▼]

Considering the fragmented literature dedicated to business failure prevention and considering the need for a unifying conceptual framework on how and why companies fail, the aim of this paper is to gather the findings from the multiple studies focused on the identification of failure factors and of failure paths, in order to propose a unifying model showing the chronological combination of the diverse factors leading a company to bankruptcy. An in-depth analysis of the existing literature and of its limitations leads us to the elaboration of an original integrative model on how and why companies fail. It is founded on a resource-based view of the firm (Wernerfelt, 1984) and it represents the different general phases through which a company goes by in its evolution towards its juridical failure. Moreover it emphasizes the fact that all companies do not necessarily follow the same paths before they disappear (Argenti, 1976). [less ▲]

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See detailPolicy, lived experience and research on career-long professional preparation for PE teachers in Wallonia
Cloes, Marc ULg

Conference (2007, September)

This presentaiton was focused on three major questions: A brief description of the landscape of the PETPD in Wallonia including details about the regulations; Illustration of activities proposed in this ... [more ▼]

This presentaiton was focused on three major questions: A brief description of the landscape of the PETPD in Wallonia including details about the regulations; Illustration of activities proposed in this region, and; Summarizing of some research results [less ▲]

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See detailModelling the sound transmission through separation walls using a diffusion model
Billon, Alexis ULg; Foy, Cédric; Valeau, Vincent et al

Conference (2007, September)

The diffusion model has been used successfully to evaluate the acoustic behaviour of a system of coupled rooms connected through a coupling aperture. In this paper, an extension of this model is proposed ... [more ▼]

The diffusion model has been used successfully to evaluate the acoustic behaviour of a system of coupled rooms connected through a coupling aperture. In this paper, an extension of this model is proposed to deal with the propagation of sound energy through a partition wall. The diffusion model can be considered as an extension of the statistical theory to none diffuse sound fields. Numerical comparisons with the statistical theory are then carried out. The following parameters are varied: its transmission loss of the separation wall, its surface, the coupled room’s absorption coefficient and the coupled room’s volume. The agreement between the statistical theory and the diffusion model is very good. [less ▲]

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See detailNarrative Songs of the Bruges Lacemakers (1730-1879)
Peere, Isabelle ULg

Conference (2007, September)

A general account of the textual and contextual data on lacemakers' songs provided by Lootens and Feys' song collection, Chants populaires flamands (1879) as a valuable source of information on the ... [more ▼]

A general account of the textual and contextual data on lacemakers' songs provided by Lootens and Feys' song collection, Chants populaires flamands (1879) as a valuable source of information on the complex study of the lacemaking tradition [less ▲]

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See detailLa Flexicurité revisitée à l’aune des pratiques effectives
Xhauflair, Virginie ULg; Pichault, François ULg

Conference (2007, September)

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