References of "Scientific congresses and symposiums"
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See detailDynamic holography for the space qualification of large reflectors
Thizy, Cédric ULg; Stockman, Yvan ULg; Doyle, D. et al

in Optical Fabrication, Testing, and Metrology II (2005, October)

The next generation of infrared - sub mm space telescopes requires reflectors with large dimensions, high quality and, according to weight issues, are based on composite or new materials technology. The ... [more ▼]

The next generation of infrared - sub mm space telescopes requires reflectors with large dimensions, high quality and, according to weight issues, are based on composite or new materials technology. The challenging tasks of on-ground testing are to achieve the required accuracy in the measurement of these reflectors shape and antenna structures and to verify their performance under simulated space conditions (vacuum, low-high temperatures). A holographic camera for the verification and validation of this type of reflector in a space environment is presented. A diffuser is implemented to measure the deformations of reflective surfaces in a more flexible way. The system has been made compatible with the vacuum conditions. Some elements of the holographic camera (camera lenses, CCD, crystal, optical fibre) have been adapted and tested under vacuum. The metrological certification of the whole system is realised by the measurement of a parabolic CFRP reflector with a 1.1 meter diameter. The results are compared to the one achieved with a high spatial resolution IR interferometer on the same reflector in laboratory conditions and under thermal vacuum conditions. This later test consists in measuring the deformations of the reflector between an initial state at a selected temperature and a final state at another temperature. The comparison between the high spatial resolution IR interferometer and this dynamic holographic method showed very good qualitative and quantitative agreement between the techniques, thus verifying the potential of this new Holographic approach. [less ▲]

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See detailRapid diabetes onset and its reversal among patients treated with second generation antipsychotics
De Hert, M.; Van Eyck, D.; Hanssens, L. et al

in European Neuropsychopharmacology (2005, October), 15(Suppl. 3), 483-484

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See detailTemporalités et territorialités dans la dynamique des réseaux, l'exemple du programme régional de la santé des jeunes
Absil, Gaëtan ULg; Vandoorne, Chantal ULg; Demarteau, Michel

in Territoire, bien-être et inclusion sociale - Résumés des communications (2005, October)

Summary : Territories and times are significant factors in networks management and efficacy. Tools should be designed to survey if networking is appropriate for a project in a particular setting.

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See detailTowards the production of carbon xerogel monoliths by optimizing convective drying conditions
Léonard, Angélique ULg; Sabatier, Françoise; Job, Nathalie ULg et al

Poster (2005, October)

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See detailRecherches récentes sur l'utilisation des Degrés de Certitude Recherches récentes sur l'utilisation des Degrés de Certitude : Directions de recherches dans le calcul des notes liant exactitude et réalisme
Castaigne, Jean-Loup ULg

in Actes du 18ème colloque international de l'ADMEE : Comment évaluer ? Outils, dispositifs et acteurs (2005, October)

Ebel (1965) définit les Degrés de Certitude comme “un mode de réponse spécial aux questions d’un test objectif et un mode spécial de cotation de ces réponses. En bref, le sujet doit indiquer non seulement ... [more ▼]

Ebel (1965) définit les Degrés de Certitude comme “un mode de réponse spécial aux questions d’un test objectif et un mode spécial de cotation de ces réponses. En bref, le sujet doit indiquer non seulement ce qu’il croit être la réponse correcte à une question, mais aussi sa certitude dans l’exactitude de sa réponse. Au moment de la cotation, le sujet reçoit plus de points pour une réponse correcte avec certitude que pour une réponse accompagnée d’un doute” (cité par Leclercq, 1983). Cette définition restreint l’utilisation des degrés de certitude d’une part aux tests par QCM alors qu’ils sont applicables à d’autres méthodes d’évaluation et d’autre part à une seule méthode de recueil des informations. Les degrés de certitude pouvant être mis au service de plusieurs objectifs, nous proposons une réflexion aux enseignants qui désirent les utiliser. Nous envisagerons plusieurs méthodes possibles pour recueillir les degrés de certitude. Pour chaque méthode, des avantages et des inconvénients sont mis en évidence et des pistes d’amélioration sont envisagées. Les trois catégories de méthodes que nous proposons sont basées sur le lien entre le barème associant les degrés de certitude et le score au test. 1. Les barèmes liés à chaque question. Lorsque l’on cote les réponses de l’étudiant, il reçoit plus de points pour une réponse correcte donnée avec une certitude plus élevée qu’une réponse correcte donnée avec une certitude plus basse. 2. Les barèmes liés au test. On calcule le score d’exactitude de l’étudiant sur base d’un tarif pour les réponses correctes, les réponses incorrectes et les omissions. Ensuite, sur base de calcul d’indices métacognitifs portant sur l’ensemble des questions, on ajoute des « points métacognitifs ». 3. Pas de barème. On calcule le score d’exactitude de l’étudiant uniquement sur base d’un tarif pour les réponses correctes, les réponses incorrectes et les omissions. Les degrés de certitude n’ont plus de valeur certificative mais formative pour l’étudiant et informative pour l’enseignant. Nous illustrerons notre démarche à partir d’un cas concret d’enseignement à distance sur les règles de l’orthographe et la communication utilisant Au sein de chacune de ces trois catégories, plusieurs options sont envisagées afin de rencontrer notre objectif : l’émission sincère de la certitude que l’étudiant associe à sa réponse. [less ▲]

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See detailMTHFR C677T polymorphism and susceptibility to migraine with aura
Magis, Delphine ULg; Coppola, Gianluca; Allena, Marta et al

in Cephalalgia : An International Journal of Headache (2005, October), 25(10), 863-864

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See detailSix-month incidence of diabetes among schizophrenic patients in Belgium
Hanssens, L.; De Hert, M.; Van Eyck, D. et al

in European Neuropsychopharmacology (2005, October), 15(Suppl. 3), 483

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See detailStructure cordale et pathologies vocales
FINCK, Camille ULg

in Revue de Laryngologie - Otologie - Rhinologie (2005, October), (126,5), 295-300

Communication présentée lors du LXIième congrès de la Société Française de Phoniatrie et des Pathologies de la Communication; Paris, le 9 octobre 2005. Our knowledge of vocal fold structure has profoundly ... [more ▼]

Communication présentée lors du LXIième congrès de la Société Française de Phoniatrie et des Pathologies de la Communication; Paris, le 9 octobre 2005. Our knowledge of vocal fold structure has profoundly evolved since the description by M.Hirano in 1974 of the laminar organization of the connective tissue of the human vocal fold , the lamina propria. The molecular composition of the extracellular matrix (ECM) of the lamina propria is essential in determining the viscoelastic properties of the tissue. This is particularly true in the superficial layer of the lamina propria ( also called Reinke’s space). With the epithelium, Reinke’s space constitutes the vocal fold main vibrator. In normal subjects, the jelly like structure of the Reinke’s space is due to a very loose fibrous scaffolding and to a balance between the interstitial proteins of the ECM : proteoglycans like decorin and hyaluronic acid and glycoproteins like fibronectin. Vibratory trauma leads , in disease states , to molecular modification of the extracellular matrix of Reinke’s space resulting in benign cordal lesions like nodules, submucosal fibrosis and vocal folds scars. Improving the knowledge of the homeostasis of Reinke’s space ECM can lead to improvement of the therapeutic and prevention strategies of vocal fold benign lesions. The main histologic and viscoelastic characteristics, as well as surgical treatment of cordal nodular lesions and scars are described. The recent researches in the field of regeneration of Reinke’s space are evoked. Rappel des connaissances de la microstructure cordale normale( et en particulier de la structure laminaire de la corde vocale ainsi que la répartition particulière des protéo- et glycosaminoglycans) , de l'altération de celle-ci en cas de nodule cordal et de cicatrice cordale. Implications thérapeutiques en terme de technique microchirurgicale, en particulier implantation d'acide hyaluronique estérifié dans la plaie microchirurgicale afin de moduler le processus de cicatrisation [less ▲]

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See detailPatients with hepatocellular carcinoma (HCC) listed for liver transplantation (LTX) outside the MELD system: outcome of a multicenter Eurotransplant series
Adler, Michael; De Pauw, Filip; Fancello, Agnese et al

in Hepatology (Baltimore, Md.) (2005, October), 42(4, suppl 1), 323-324

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See detailGeneralized shape optimization using XFEM and Level Set methods
Duysinx, Pierre ULg; Van Miegroet, Laurent ULg; jacobs, Thibaut et al

in Bendsoe, M.-P.; Olhoff, N.; Sigmund, O. (Eds.) Proceedings of Topopt SYMP2005, IUTAM Symposium. Topological Design Optimization of Structures, Machines and Materials. Status and Perspectives (2005, October)

This paper presents an intermediate approach between parametric shape optimization and topology optimization. It is based on using the recent Level Set description of the geometry and the novel eXtended ... [more ▼]

This paper presents an intermediate approach between parametric shape optimization and topology optimization. It is based on using the recent Level Set description of the geometry and the novel eXtended Finite Element Method (XFEM). The method takes benefit of the fixed mesh work using X-FEM and of the curves smoothness of the Level Set description. Design variables are shape parameters of basic geometric features. The number of design variables of this formulation is small whereas various global and local constraints can be considered. The Level Set description allows to modify the connectivity of the structure as geometric features can merge or separate from each other. However no new entity can be introduced. A central problem that is investigated here is the sensitivity analysis and the way it can be carried out efficiently. Numerical applications revisit the classical elliptical hole benchmark from shape optimization. [less ▲]

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See detailLack of habituation of visual evoked gamma band oscillations in migraine patients between attacks
Coppola, G.; Ambrosini, A.; Di Clemente, L. et al

in Cephalalgia : An International Journal of Headache (2005, October), 25(10), 885

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See detailIsocinétisme et pathologie musculaire traumatique
Croisier, Jean-Louis ULg

in Annales de Réadaptation et de Médecine Physique (2005, October), 48(7), 511

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See detailSearch for a correlation between MTHFR C677T polymorphism and efficacy of riboflavin in migraine prophylaxis
Magis, Delphine ULg; Allena, Marta; da Silva, Hilton Mariano et al

in Cephalalgia : An International Journal of Headache (2005, October), 25(10), 864

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See detailDating architectural ceramics by luminescence methods: actual state and potentials
Guibert, Pierre; Vieillevigne, Emmanuelle; Bechtel, Françoise et al

Conference (2005, October)

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See detailTrigeminal nociceptive evoked potentials (TNEP) in migraine
Magis, Delphine ULg; Allena, Marta; De Pasqua, Victor ULg et al

in Cephalalgia : An International Journal of Headache (2005, October), 25(10), 875

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See detailDétournement d'un outil formatif en 1ère année universitaire
Minet, Vincent; Palm, Rodolphe ULg

Conference (2005, October)

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See detailDiagnosis of obstructive sleep apnoea and hypopnoea syndrome based on automatic analysis of mandibular movements
Senny, Frédéric ULg; Destiné, Jacques ULg; Ansay, Pierre et al

in Proceedings of the 1st WASM Congress (2005, October)

Our study showed the potential of a surrogate of the oesophageal pressure, the jaw motion, and a dedicated automatic analysis to diagnose the obstructive sleep apnoea and hypopnoea syndrome (OSAHS ... [more ▼]

Our study showed the potential of a surrogate of the oesophageal pressure, the jaw motion, and a dedicated automatic analysis to diagnose the obstructive sleep apnoea and hypopnoea syndrome (OSAHS). Twentyfour patients were recorded in hospital settings and the jaw motion of fifteen of them was also recorded at home with an ambulatory device. The apnoea and hypopnoea index (AHI) of the gold standard, AHI_PSG, and the two AHI from the automatic analysis of the jaw motion, AHI_H (hospital) and AHI_A (ambulatory), were compared : AHI_PSG Vs AHI_H showed good correlation (r = 0.97) and under-estimation (slope p = 0.76). AHI_A Vs AHI_H revealed good reliability with r = 0.98 and slope p = 0.99. Finally, AHI_PSG Vs AHI_A showed very good accuracy of the diagnosis with sensitivity of 90% and specificity of 100%. [less ▲]

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See detailGender budgeting : facteurs de succès et difficultés
Cornet, Annie ULg

Conference (2005, October)

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See detailL'infection par les prions pathogènes modifie l'expression menbranaire de la PrPc par les cellules dendritiques
Dorban, G; Demonceau,C; Levavasseur, E et al

Poster (2005, October)

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See detailAnalyse quantitative de la texture poreuse d'un matériau polymère cellulaire basée sur des images de microtomographie à rayons X
Lecocq, Raphaël; Toye, Dominique ULg; Maquet, Véronique et al

Poster (2005, October)

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See detailÉtude de la texture poreuse d'un matériau polymère cellulaire utilisé en ingénierie tissulaire par microtomographie à rayons X
Lecocq, Raphaël; Toye, Dominique ULg; Maquet, Véronique et al

Poster (2005, October)

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See detailCPR in pregnancy
Brichant, Jean-François ULg

Conference (2005, September 30)

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See detailFluid therapy in PET
Brichant, Jean-François ULg

Conference (2005, September 30)

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See detailPrévalence des calcifications vasculaires et facteurs associés chez le patient hémodialysé
XHIGNESSE, Patricia ULg; Saint-Remy, Annie ULg; WEEKERS, Laurent ULg et al

Poster (2005, September 27)

Les maladies cardiovasculaires constituent la première cause de décès chez les patients dialysés chroniques. Parmi les facteurs impliqués on trouve les anomalies du métabolisme phosphocalcique. Le but de ... [more ▼]

Les maladies cardiovasculaires constituent la première cause de décès chez les patients dialysés chroniques. Parmi les facteurs impliqués on trouve les anomalies du métabolisme phosphocalcique. Le but de cette étude est de relier l'incidence de nouvelles calcifications et des décès (22%, n=18) avec les paramètres du métabolisme phosphocalcique au travers d'une étude prospective portant sur les années 2003-2004. L'établissement d'un score de calcification vasculaire précoce (dès la prise en charge en dialyse) permettra un suivi étroit et une adaptation prudente du traitement contrôlant le métaboisme phosphocalcique. [less ▲]

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See detailAmputation des membres inférieurs, diabète et survie chez le patient dialysé chronique
sumaili, Ernest; Saint-Remy, Annie ULg; DUBOIS, Bernard ULg et al

Poster (2005, September 27)

Chez les patients HD, la mortalité après amputation est importante (83%). La période critique post opératoire est de 2 mois avec une médiane de survie d'environ 1 an. Le diabète et les troubles ... [more ▼]

Chez les patients HD, la mortalité après amputation est importante (83%). La période critique post opératoire est de 2 mois avec une médiane de survie d'environ 1 an. Le diabète et les troubles phosphocalciques sont en relation avec la nécessité d'amputation et la survie médiocre chez des patients ayant de lourds antécédents cv. Une optimalisation de la prise en charge thérapeutique de ces patients à risque est nécessaire. [less ▲]

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See detailEVALUACIÓN DE LA ACCIÓN DE NUEVOS POLICATIONES SINTÉTICOS SOBRE LAS PROPIEDADES VISCOELÁSTICAS DE LA MEMBRANA ERITROCITARIA
Riquelme, B; Foresto, P; Lebensohn, N et al

in Anales de la Asociación Argentina de Física (2005, September 26), 17

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See detailAnesthésie de la femme enceinte pour un acte opératoire non obstétrical
Brichant, Jean-François ULg

Conference (2005, September 26)

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See detailAnesthésie et réanimation d'une parturiente présentant une prééclampsie
Brichant, Jean-François ULg

Conference (2005, September 26)

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See detailEarly retirement, activities after retirement and the cognitive reserve
Adam, Stéphane ULg; Bay, Christelle; Perelman, Sergio ULg

Conference (2005, September 26)

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See detailEvaluación de a acción de nuevos policationes sintéticos sobre las propiedades viscoelásticas de la membrana eritrocitaria
Riquelme, B; Foresto, P; Lebensohn, N et al

Conference (2005, September 26)

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See detailMicrocapsules/microparticles loaded with biologically active molecules for medicine
Markvicheva, E; Selina, O; Stashevskaya, K et al

in Proceedin of European Congress on Chemical Engineering (2005, September 25)

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See detailNicholas Jose's 'Black Sheep'
Delrez, Marc ULg

Conference (2005, September 24)

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See detailProduction de xérogels de carbone hyperporeux par séchage convectif
Léonard, Angélique ULg; Job, Nathalie ULg; Jomaa, W. et al

Poster (2005, September 20)

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See detailUtilización de p24 recombinante para la optimización de un ELISA para detectar anticuerpos anti-BLV en suero
Gutiérrez, G.; Álvarez, I.; Rodriguez, Sabrina ULg et al

Poster (2005, September 19)

Utilización de p24 recombinante para la optimización de un ELISA para detectar anticuerpos anti-BLV en suero. Gutierrez, G.; Alvarez, I.; Rodríguez, S. y Trono, K. Instituto de Virología. CICVyA. INTA ... [more ▼]

Utilización de p24 recombinante para la optimización de un ELISA para detectar anticuerpos anti-BLV en suero. Gutierrez, G.; Alvarez, I.; Rodríguez, S. y Trono, K. Instituto de Virología. CICVyA. INTA Cautelar. El gen completo que codifica para la proteína mayoritaria de la cápside del Virus de la leucosis bovina (BLV), p24, fue amplificado y clonado en un vector de expresión para E.coli. La proteína p24 recombinante (p24r) expresada fue caracterizada por Western blot utilizando un suero monoclonal y un suero policlonal de referencia, demostrando ser altamente específica y no reconocida por sueros de animales no infectados. La proteína fusionada a un tag de histidina fue purificada y utilizada como antígeno de ELISA para detectar anticuerpos anti-BLV en muestras individuales de suero bovino. La metodología fue optimizada en sus diferentes parámetros de uso como solución bloqueante, temperatura y tiempo de incubación, dilución de suero, fase sólida y sustrato colorimétrico; y se desarrolló a partir de estos resultados un ensayo de ELISA indirecto (ELISAp24r) que fue comparado con la prueba oficial de Inmunodifusión en gel de agar (IDGA) y un ELISA indirecto previamente validado, que utilizan como antígeno BLV completo semi-purificado obtenido de un cultivo celular persistentemente infectado. El ensayo comparativo demostró que de 91 sueros positivos por IDGA, 87 resultaron positivos por ELISAp24r. Asimismo, de un total de 184 sueros negativos por IDGA, 179 resultaron negativos por ELISA recombinante. El análisis comparativo mostró un índice de concordancia muy bueno con la prueba oficial de uso actual (IDGA). El ELISAp24r demostró ser una herramienta útil y fácil de aplicar para el diagnóstico de BLV sobre un gran número de muestras, y además posee una ventaja comparativa económica debido al bajo costo de producción y purificación del antígeno p24r en comparación con la producción del mismo a partir de cultivos celulares. [less ▲]

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See detailMultiplication by a Constant and Recognizability in an Abstract Numeration System
Charlier, Emilie ULg

Poster (2005, September 12)

One of the main interesting concerns in work about numeration systems is studying the relationship that exist between arithmetic properties of numbers and syntactical properties of their representation ... [more ▼]

One of the main interesting concerns in work about numeration systems is studying the relationship that exist between arithmetic properties of numbers and syntactical properties of their representation. More precisely, we prefer to manipulate set of numbers whose representations are characterized by very simple syntactical rules, that is, forming a regular language. Such sets are called S-recognizable sets, where S is the numeration system we are working with. In particular, we would like to obtain numeration systems in which the whole set N is recognizable, partly due to the fact that, if the set of representations of all integers is regular, there are very simple algorithms making it possible to decide if a word stands or does not stand for a number. Some general questions in this area are the following. • Characterization of the recognizable parts in a fixed numeration system. • Determination of the numeration systems for which a given set of numbers is recognizable. • To examine the stability of recognizability under arithmetic operations. In this poster we present our research about that last problem. First, we will define the abstract numeration systems based on a regular language. Then we will study the relationship between multiplication by a constant and the S-recognizability for languages of the type a_1^∗ . . . a_k^∗. [less ▲]

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See detailTowards 'capabilitating' education policies? A critical analysis of public action in education
Verhoeven, Marie; Dupriez, Vincent; Orianne, Jean-François ULg

Conference (2005, September 12)

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See detailAspect in Egyptian: a Semantic Approach
Winand, Jean ULg

Conference (2005, September 10)

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See detailLa qualité des froments d'hiver en 2005?
Sinnaeve, Geoges; Lenartz, J.; Herman, Jean-Luc et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2005, September 08)

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See detailLe froment d'hiver
Vancutsem, Françoise ULg; Couvreur, Luc; Bodson, Bernard ULg et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2005, September 08)

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See detailEscourgeon et Orge d'hiver fourragers
Herman, Jean-Luc; Monfort, Bruno; Couvreur, Luc et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2005, September 08)

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See detailNatural and projectively equivariant quantizations
Radoux, Fabian ULg

Conference (2005, September 02)

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See detailUltraviolet Spectroscopy of Saturn: Determination of Auroral characteristics with FUSE, STIS and UVIS Spectra
Gustin, Jacques ULg; Gérard, Jean-Claude ULg; Feldman, P. D. et al

Poster (2005, September 01)

Ultraviolet (UV) lines from Saturn's aurorae are emitted following inelastic collisions between energetic electrons and H[SUB]2[/SUB] molecules. De-excitation by radiative process lead to Far Ultraviolet ... [more ▼]

Ultraviolet (UV) lines from Saturn's aurorae are emitted following inelastic collisions between energetic electrons and H[SUB]2[/SUB] molecules. De-excitation by radiative process lead to Far Ultraviolet (FUV) and Extreme Ultraviolet (EUV) emissions in the 750-1750 Å spectral window. Low resolution spectra ( 12 Å) obtained with HST/STIS in the 900-1700 Å window are employed to derive the absorption of the auroral photons by hydrocarbons (mainly methane) and depth of the auroral energy deposition. Determination of H[SUB]2[/SUB] temperature and overlying H[SUB]2[/SUB] column is achieved by analyzing spectra obtained with the FUSE instrument ( 0.2 Å resolution with the LWRS aperture in the 900-1200 Å spectral window). Below 1100 Å, transitions connecting to the v" = 0 and 1 levels of ground-state H[SUB]2[/SUB] are partially or totally absorbed by ambient H[SUB]2[/SUB] (self-absorption). Comparisons between observed and synthetic spectra allow to derive the gaz temperature and the overlying H[SUB]2[/SUB] column, which is an indicator of the depth of the aurora, hence of the energy of the precipitated electrons. Auroral spectra of Saturn at 12 Å resolution were also obtained with Cassini's Ultraviolet Imaging Spectrograph (UVIS), both in the EUV and FUV spectral bands. While the spectral resolution of UVIS is too low to estimate temperatures, the coverage of the entire UV domain allows to determine the energy of precipitated particles through the quantification of the methane and molecular hydrogen columns. Results from observations with these three instruments are presented and compared in order to characterize the auroral atmosphere and auroral electrons precipitated from Saturn's magnetosphere. [less ▲]

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See detailModelling of Cellular Dynamics
Bullinger, Eric ULg

Conference (2005, September 01)

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See detailLa pré-éclampsie dans tous ses états. Gestion en anesthésie
Brichant, Jean-François ULg

Conference (2005, September)

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See detailSugar esters lipase mediated synthesis from vegetable oils
Destain, Jacqueline ULg; Detry, J.; Lognay, Georges ULg et al

Poster (2005, September)

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See detailAutobiographical remediation therapy in schizophrenia: results from an exploratory clinical training
Blairy, Sylvie ULg; Neumann, Aurore; Nachtergael, Hilde et al

Poster (2005, September)

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See detailLongitudinal study of magnetic resonance imaging and fixed-flexion radiography to assess progression of osteoarthritis of the knee
Kothari, Manish; Peterfy, Charles; Bruyère, Olivier ULg et al

in Arthritis and Rheumatism (2005, September), 52(number 9 (suppl.)), 65

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See detailProcollagen type-III aminoterminal peptide in serum and bronchoalveolar lavage fluid in dogs with chronic bronchopneumopathies – preliminary results
Schuller, S.; Talavera, J.; Jespers, P. et al

in 15th ESVIM Meeting - Glasgow - Ecosse - Septembre 2005 (2005, September)

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See detailTOPACMER : indices de participation d'étudiants à un cours dans l'Enseignement Supérieur
Leclercq, Dieudonné ULg; Glowacki, Jessica

in Rege-Colet, Nicole (Ed.) Actes du Colloque AIPU 2005 : L'enseignement supérieur du XXIe siècle : de nouveaux défis à relever (CD Rom) (2005, September)

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See detailControls on the oceanic CO2 sink near the Crozet Plateau in the Southern Ocean
Bakker, D; Nielsdottír, M.; Allen, J et al

Poster (2005, September)

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See detailSurprisingly complicated dynamics of a SDOF linear oscillator coupled to a nonlinear attachment
Lee, Young Sup; Kerschen, Gaëtan ULg; Vakakis, Alexander F. et al

in ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, Long Beach, 2005 (2005, September)

We study the dynamics of a two-degree-of-freedom nonlinear system consisting of a linear oscillator with an essentially nonlinear attachment. For the undamped system, we perform a numerical study based on ... [more ▼]

We study the dynamics of a two-degree-of-freedom nonlinear system consisting of a linear oscillator with an essentially nonlinear attachment. For the undamped system, we perform a numerical study based on non-smooth temporal transformations to determine its periodic solutions in a frequency–energy plot. It turns out that there is a sequence of periodic solutions bifurcating from the main backbone curve of the plot. We then study analytically the periodic orbits of the undamped system using the complexification / averaging technique in order to determine the frequency contents of the various branches of solutions, and to understand the types of oscillation performed by the system at the different regimes of the motion. The transient responses of the weakly damped system are then examined, and numerical wavelet transforms are used to study the time evolutions of their harmonic components. We show that the structure of periodic orbits of the undamped system greatly influences the damped dynamics, as it causes complicated transitions between modes in the damped transient motion. In addition, there is the possibility of strong passive energy transfer from the linear oscillator to the nonlinear attachment if certain periodic orbits of the undamped dynamics are excited by the initial conditions. [less ▲]

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See detailValorization of olive mill wastewater by the yeast Yarrowia lipolytica.
Araújo, C.; Aguedo, Mario ULg; Gomes, N. et al

in Poceedings of the 9th International Chemical Engineering Conference (2005, September)

The aim of this work was to study the ability of two different strains of the yeast Yarrowia lipolytica to grow on Olive Mill Wastewater (OMW) and their potential to produce high-value products such as ... [more ▼]

The aim of this work was to study the ability of two different strains of the yeast Yarrowia lipolytica to grow on Olive Mill Wastewater (OMW) and their potential to produce high-value products such as lipases. Factors affecting cellular growth and OMW degradation were studied, such as nitrogen supplementation, cells concentration and surfactant addition. Both strains used were able to grow in an OMW with a COD of 19 g/L and total phenols concentration of around 800 mg/L. The strain W29 presented the highest potential for extracellular lipase production from OMW. Lipase productivity was improved by the medium supplementation with ammonium sulphate up to 6 g/L, leading to 80 % of COD degradation and 70 % of total phenols reduction. The surfactant Tween 80 enhanced cell growth and COD degradation, but had no significant effect on lipase productivity. The results evidenced that the conditions that favoured lipase production differ from the conditions that improve COD removal from OMW. [less ▲]

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See detailAmputation des membres inférieurs, diabète et survie chez le patient dialysé chronique
Sumaili, Ernest; Saint-Remy, Annie ULg; Dubois, Bernard ULg et al

in Néphrologie & Thérapeutique (2005, September), 1(S2), 110

Objectif. – La mortalité cardiovasculaire (cv) est très élevée chez les patients hémodialysés chroniques (HD). Les atteintes vasculaires responsables d'amputations ne font qu'accroître cette mortalité. Le ... [more ▼]

Objectif. – La mortalité cardiovasculaire (cv) est très élevée chez les patients hémodialysés chroniques (HD). Les atteintes vasculaires responsables d'amputations ne font qu'accroître cette mortalité. Le but de cette étude est de décrire les causes de décès et la courbe de survie post-amputation ainsi que d'analyser les facteurs pouvant influencer cette survie. [less ▲]

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See detailDirections de recherches dans le calcul des notes liant exactitude et réalisme: illustration à travers une démarche en formation à distance
Castaigne, Jean-Loup ULg

in Actes du 22e congrès de l'association internationale de pédagogie universitaire (AIPU) : L'enseignement supérieur du {XXIe} siècle : de nouveaux défis à relever. (2005, September)

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See detailIrreversible passive TEF in the damped response of coupled oscillators with nonlinearity
Kerschen, Gaëtan ULg; Lee, Young S.; Vakakis, Alexander F. et al

in ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, Long Beach, 2005 (2005, September)

We study, numerically and analytically the dynamics of passive energy transfer from a damped linear oscillator to an essentially nonlinear end attachment. This transfer is caused either by fundamental or ... [more ▼]

We study, numerically and analytically the dynamics of passive energy transfer from a damped linear oscillator to an essentially nonlinear end attachment. This transfer is caused either by fundamental or subharmonic resonance capture, and in some cases is initiated by nonlinear beat phenomena. It is shown that, due to the essential nonlinearity, the end attachment is capable of passively absorbing broadband energy both at high and low frequencies, acting, in essence, as a passive broadband boundary controller. Complicated transitions in the damped dynamics can be interpreted based on the topological structure and bifurcations of the periodic solutions of the underlying undamped system. Moreover, complex resonance capture cascades are numerically encountered when we increase the number of degrees of freedom of the system. The grounded, essentially nonlinear end attachment discussed in this work can find application in numerous practical settings, including vibration and shock isolation of structures, seismic isolation, flutter suppression and packaging. [less ▲]

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See detailMolecular sexing of Ursidae: application on extant and extinct brown bears
Pagès, Marie ULg; Maudet, Célia; Bellemain, Eva et al

Poster (2005, September)

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See detailGestion des compétences, impératifs économiques et préoccupations sociales: un mariage forcé
Antoine, Mélanie ULg; Deflandre, Dimitri; Pichault, François ULg

Conference (2005, September)

Cette communication entend faire le point sur les modalités d’introduction d’une démarche compétences, à l’aide d’un cadre d’analyse contextualiste. Nous essayons de montrer que, contrairement aux ... [more ▼]

Cette communication entend faire le point sur les modalités d’introduction d’une démarche compétences, à l’aide d’un cadre d’analyse contextualiste. Nous essayons de montrer que, contrairement aux présupposés d’une certaine littérature normative, la démarche compétences ne contribue pas nécessairement à l’articulation harmonieuse des logiques économiques et sociales : elle peut parfois s’opérer dans une logique purement économique, en-dehors de toute considération sociale. La discussion proposée est menée à partir de deux études de cas dans le secteur de la sidérurgie et de la banque. On y mesure l’influence des différences de contexte, aboutissant à des contenus radicalement opposés : dans le premier cas, l’adoption d’une stratégie de rationalisation et de leadership des coûts, pour faire face à la crise du secteur, conduit à privilégier une approche principalement centrée sur les exigences de la production ; dans le second cas, la préférence accordée à une stratégie de différenciation, dans le cadre d’une fusion entre deux entreprises, semble bel et bien favoriser les possibilités de développement personnel des collaborateurs. Néanmoins, au-delà des différences de contexte, c’est le processus d’introduction de la démarche compétences qui semble compter avant tout: même avec une finalité purement économique dans le premier cas, le processus a été géré de manière prudente, dans le respect des positions syndicales, et avec un évident souci de maintenir un climat social relativement serein. [less ▲]

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See detailReduced-order modeling of flexible mechanisms
Bruls, Olivier ULg

Conference (2005, September)

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See detailHistochemical and immunohistochemical characterization of canine nasopharyngeal lymphoid tissue
Billen, Frédéric ULg; Peeters, Dominique ULg; Dehard, Sandrine ULg et al

in 15th ESVIM Meeting - Glasgow - Ecosse - Septembre 2005 (2005, September)

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See detailDiscrete optimization
Louveaux, Quentin ULg

Poster (2005, September)

Have you ever wondered what is the shortest route to join the office? What is the best way to plan a trip through several cities? You have maybe already played with magical squares? Then you have met one ... [more ▼]

Have you ever wondered what is the shortest route to join the office? What is the best way to plan a trip through several cities? You have maybe already played with magical squares? Then you have met one of the nu- merous instances of discrete optimization. Discrete optimization is a field of mathematics which deals with any problem where parts of the solutions cannot be divided or fractional. And as one may guess, this is the case in many real-life problems. This poster is divided in three main topics. The first part focuses on formulating those problems. We will start from one of the industrial appli- cations and show how we can model it as a mathematical problem. In the second part we sketch the main tools and algorithms used to tackle those problems. In particular we point out the fact that requiring integrality leads to extremely hard problems to solve. We show that despite this fact, we are able to solve problems of substantial size. However there remain some problems that are hard to solve using the state-of-the-art techniques. In the third part we indicate what are the chal- lenges of the field. In particular we will give an overview of the research car- ried out in the universities supported by the Marie-Curie network ADONET. [less ▲]

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See detailMulti-Objective Optimization of a Fan Blade by Coupling a Genetic Algorithm and a Parametric Flow Solver
Kelner, Vincent ULg; Grondin, Gilles; Léonard, Olivier ULg et al

in Proceedings of EUROGEN'05 (2005, September)

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See detailKilling kinetics of clinical isolates of group B streptococci isolated in Belgium for penicillin alone or in combination with gentamicin
MELIN, Pierrette ULg; Lorquet, Sophie; HAYETTE, Marie-Pierre ULg et al

Poster (2005, September)

BACKGROUND: Associated with high morbidity and mortality, severe GBS infections should be treated with antimicrobial agents alone or in combination characterized by both a good diffusion at the site of ... [more ▼]

BACKGROUND: Associated with high morbidity and mortality, severe GBS infections should be treated with antimicrobial agents alone or in combination characterized by both a good diffusion at the site of infection and a short bactericidal lag time. Penicillin (P) or another blactam used in combination with an aminoglycoside is usually recommended to start the therapy. MICs to gentamicin (G) of GBS recently isolated in Belgium range from 16 to 256 mg/L (> or = MICs of E.faecalis with low level resistance to G, LLR). OBJECTIVES: To investigate in vitro, the potential synergism of P+G on strains of GBS isolated in Belgium. METHODS: According to Etest-AB Biodisk original procedures, for 6 Belgian strains of GBS (G MICs: 16-128 mg/L), we investigated the potential synergism, MICs and time killing curves, between P and G (ratio1:1). In the killing kinetic assays, surviving organisms were enumerated initially and repeatedly after 2, 4, 8 and 20 hours (T2, T4, T8 and T20) at concentrations of P equal to 4 and 16x MICs. Two strains of E.faecalis (1 HighLR and 1 LLR to G) were used as negative and positive control. Each isolate was tested twice. RESULTS: For GBS the P MICs in the combination were within +/- 1 dilution compared with single drug. As expected, P+G produced enhanced killing at T2 and T4 compared with P alone for G LLR E.faecalis and there was no difference for the G HLR E.faecalis. On the contrary, no accelerated killing was observed for any GBS isolate with the combination even for a concentration of 16xMIC of P; moreover for 3 isolates a reduced killing was observed at T2 in the combination tests compared with P alone. CONCLUSION: This limited in vitro testing of the combination P+G compared with P alone for Belgian GBS isolates did not show any synergism or accelerated killing. Moreover the killing was reduced at T2 for half of the isolates. Further evaluation should be performed on these strains with other ratio or other b-lactams as ampicillin in combination with G. [less ▲]

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See detailDirect extraction of hadronic form factors from elastic-scattering data
Martynov, E.; Cudell, Jean-René ULg; Lengyel, A.

in Nuclear Physics B-Proceedings Supplements (2005, September), 146

Non-forward elastic hadron-scattering data are collected and analysed within the Regge approach. Through an analysis of the data in small bins in t, we have directly extracted the pomeron trajectory and ... [more ▼]

Non-forward elastic hadron-scattering data are collected and analysed within the Regge approach. Through an analysis of the data in small bins in t, we have directly extracted the pomeron trajectory and the hadronic form factors (or reggeon couplings). We found higher values than usually used for the intercept and for the slope of the soft pomeron trajectory. The presence of zeros in t for the effective hadronic form factors is emphasised. [less ▲]

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See detailMuscular and physical features correlated with ball velocity during the volleyball spike
Forthomme, Bénédicte ULg; Croisier, Jean-Louis ULg; Ciccarone, Guido et al

in Computer Methods in Biomechanics & Biomedical Engineering (2005, September), 8(Supp 1), 105-106

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See detailMagnetic Resonance Imaging and biochemical markers of osteoarthritis of the knee
Kothari, Manish; Bruyère, Olivier ULg; COLLETTE, Julien ULg et al

in Arthritis and Rheumatism (2005, September), 52(number 9 (suppl.)), 71

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See detailAbout the use of simulation models and of functional tests in commissioning of HVAC systems.
Adam, Ch.; Andre, Philippe ULg; Aparecida, Cl. et al

in Proceedings of the International conference Energy efficient technologies in indoor environment (2005, September)

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See detailAn attempt to create power line anti-galloping device with hysteretic type energy dissipation
Vinogradov, Alexander; Platonova, Irina; Akuratov, Andrei et al

in Proceedings of the 6th International Conference on Cable Dynamics (2005, September)

A new concept of anti-galloping device (TDD) based on hysteretic type damper is detailed.

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See detailDynamic analysis of the nonlinear behavior of MEMS using the finite element formulation
Rochus, Véronique ULg; Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, Long Beach, 2005 (2005, September)

The dynamic response of a mass-spring model of electrostatically actuated MEMS is analyzed when a voltage step is applied. The dynamics of a clamped-clamped beam representing a micro-bridge system are ... [more ▼]

The dynamic response of a mass-spring model of electrostatically actuated MEMS is analyzed when a voltage step is applied. The dynamics of a clamped-clamped beam representing a micro-bridge system are also considered. To model and simulate the strong coupling between the electric and mechanical fields, a general finite element program has been developed based on a new monolithic formulation. The methodology proposed in this program does not require any iterative numerical scheme based on separate electrostatic and mechanical solvers, respectively. [less ▲]

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See detailThe influence of mechanical parameters on tissue differentiation and bone formation around immediately loaded implants in the bone chamber model
Vandamme, Katleen; Duyck, Joke; Geris, Liesbet ULg et al

in Computer Methods in Biomechanics & Biomedical Engineering (2005, September), 8(4), 275-276

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See detailThe effect of continuous galvanizing thermal cycle on the microstructure and mechanical properties of two multiphase TRIP-assisted steels
Mertens, Anne ULg; McDermid, Joseph R.

in Proceedings of the MS&T'05 Conference (2005, September)

Multiphase TRIP assisted-steels are particularly attractive for the automotive industry, as they exhibit an exceptional strength-ductility balance which is attained through the combination of a complex ... [more ▼]

Multiphase TRIP assisted-steels are particularly attractive for the automotive industry, as they exhibit an exceptional strength-ductility balance which is attained through the combination of a complex microstructure and of a TRIP effect, i.e. the mechanically induced transformation of metastable retained austenite. This multiphase microstructure - and particularly the retention of metastable austenite - is obtained through the combination of appropriate chemistry and processing conditions, i.e an intercritical annealing followed by an isothermal hold in the temperature range for bainite formation. It has been established that this second step is important in controlling austenite retention and hence the mechanical properties. In the present work, the effect of heat treatment cycles compatible with the continuous hot dip galvanizing process, namely a high bainitic dwell temperature, on the microstructure and mechanical properties of two multiphase TRIP-assisted steel grades - one Si-alloyed grade and one mixed Si-Al grade - has been studied. It was shown that bainite formation in the Si-alloyed grade was too slow to bring about the retention of a significant amount of austenite down to room temperature. The mixed Al-Si grade, on the other hand, exhibited faster bainite formation kinetics under heat treatment conditions compatible with the CGL process, such that it is possible to retain a significant amount of austenite. The partial substitution of silicon by aluminum appears thus a promising path for the production of galvanized TRIP-assisted steels. [less ▲]

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See detailReduced-order modeling of flexible mechanisms with configuration-dependent dynamics: a modal approach
Bruls, Olivier ULg

Conference (2005, September)

Modern formalisms in multibody dynamics allow a detailed and reliable representation of complex mechanical systems. However, high levels of accuracy and generality can only be reached at the price of more ... [more ▼]

Modern formalisms in multibody dynamics allow a detailed and reliable representation of complex mechanical systems. However, high levels of accuracy and generality can only be reached at the price of more sophisticated models, which require increased computational resources. Reduction techniques have thus been developed in order to build simplified models able to capture the essential dynamics of a flexible mechanism. In this talk, a methodology is proposed to transform an initial high-order Finite Element model into a low-order and explicit model. The reduction method is an extension of the component-mode technique established in linear structural dynamics, which accounts for the nonlinear kinematics of the mechanism. It relies on the original concept of “Global Modal Parameterization”: the motion of the assembled mechanism is described in terms of rigid and flexible modes, which depend on the mechanical configuration. We will show that the reduction procedure leads to a consistent model, with configuration-dependent parameters. The nonlinear variations of those parameters are approximated using a piecewise polynomial interpolation. This strategy is based on an adaptive configuration space inspection algorithm, which minimizes the computational resources to satisfy a specification on the approximation error. Several examples will be considered in the presentation: a four-bar mechanism, a parallel kinematic machine-tool, and a lightweight manipulator. [less ▲]

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See detailReactivity of precious metal and transition metal oxide catalysts towards the total oxidation of volatile organic compounds containing nitrogen or sulfur atom (N-VOCs or S-VOCs)
Cellier, Caroline; Ruaux, V.; Lahousse, C. et al

in Catalytic Combustion, volume 2 (2005, September)

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See detailCharacterisation of an original model of myocardial infarction provoked by coronary artery thrombosis induced by ferric chloride in pig
Dogné, Jean-Michel ULg; Rolin, S.; Tchana-Sato, Vincent ULg et al

in European Heart Journal (2005, September), 26(Suppl. 1), 455-456

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See detailComparative study of decyl thiocyanate and decanethiol self-assembled monolayers on gold substrates
Dreesen, Laurent ULg; Volcke, Cédric; Sartenaer, Yannick et al

Poster (2005, September)

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See detailMolecular conformation and electronic properties of protoporphyrin-IX self-assembled monolayers adsorbed on Pt(111) surface
Humbert, Christophe; Volcke, Cédric; Sartenaer, Yannick et al

Poster (2005, September)

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See detailPrenatal development study of rat Corti organ at the morphological level
Thelen, Nicolas ULg; Malgrange, Brigitte; Thiry, Marc ULg

Poster (2005, September)

Although the structural organization of the mature Corti organ is generally well defined, little is known about its prenatal development. Here, we have examined by photonic and electron transmission ... [more ▼]

Although the structural organization of the mature Corti organ is generally well defined, little is known about its prenatal development. Here, we have examined by photonic and electron transmission microscopies the morphological changes occurring in the cochlear epithelium from the embryonic day 16 to 19 in rat. <br />At the embryonic day 16 (E16), whatever the region of the cochlear studied (base, medium, apex), the organ of Corti is not present. The cochlear epithelium appears as a pseudostratified epithelial tissue formed by two distinct regions according to the staining of the cells : a pale region on the striolar side of the cochlear canal and a darker region on the modiolar side. At E17, it appears in the basal and medium cells of the cochlear epithelium, at the transition between the pale and the dark one, a cell visible on the whole height of the epithelium. By electron microscopy, we also show that this cell has a rich content in glycogen, a characteristic reminiscent to pillar cells. These results suggest that the first differentiating cell in the cochlear epithelium could be a pillar cell. At E18, in the majority of sections realized at the base and medium of the cochlear canal, the organ of Corti is relatively well recognizable. We distinguish principally the inner hair cells but also to a lesser extent the outer hair cells as well as the supporting cells (pillar, phalengeal and Deiters cells). At E19, the organ of Corti is clearly recognizable in all the basal and medium cells. By contrast, it is yet differenciated at the apex. <br />These data seem to indicate that the Corti organ in rat develops from base to apex starting by the pillar cells. [less ▲]

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See detailLong-term outcome of patients with heart failure and dynamic functional mitral regurgitation
Lancellotti, Patrizio ULg; Gerard, P. G.; Ancion, A. et al

in European Heart Journal (2005, September), 26(Suppl. 1), 539

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See detailAnesthésie en obstétrique: problèmes cliniques
Brichant, Jean-François ULg

Conference (2005, September)

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See detailSERMs-induced myeloma cell apoptosis: A study of NF-kappa B inhibition and gene expression signature
Olivier, Sabine ULg; Close, Patricia ULg; Castermans, Emilie ULg et al

in Journal of Bone and Mineral Research (2005, September), 20(9, Suppl. 1), 213

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See detailHistochemical and immunohistochemical characterisation of canine nasopharyngeal lymphoid tissue
Billen, Frédéric ULg; Peeters, Dominique ULg; Dehard, Sandrine ULg et al

in Proceedings of the 15th ECVIM-CA Congress (1-3/09/2005), Glasgow, Scotland (2005, September)

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See detailPassive solar buildings : development and evaluation of a model-based optimal controller through experimentation and simulation.
Andre, Philippe ULg; Kummert, M.

in Proceedings of the International conference Energy efficient technologies in indoor environment (2005, September)

Different heating system controllers for passive solar buildings are compared on two different buildings. The performance criterion combines energy performance and thermal comfort using the "cost function ... [more ▼]

Different heating system controllers for passive solar buildings are compared on two different buildings. The performance criterion combines energy performance and thermal comfort using the "cost function" paradigm. The experimental facilities did not allow a direct experimental comparison by using two identical buildings. The controllers were implemented alternatively in one building and a performance comparison was obtained in two ways: first by identifying short periods that have similar driving variables (weather and building occupancy) and comparing the experimental obtained in both cases. The second method mixes experiments and simulation using a well-tuned model of the building and its occupants. This paper discusses the results obtained using both methods and shows that both methods give consistent estimates of the difference between controllers, while the second method allows to extrapolate useful information from the limited data available. In a second evaluation step the controller is applied to a multizone building, and a detailed model is used for the HVAC system. The model-based control algorithm is not modified. It is based on a simplified internal model. It is shown that the optimal controller's performance varies strongly with the zone that is considered and the reference zone that is used. However, it is never worse than the performance of a reference controller. The global performance at the building level depends on the selected reference zone and on the building sensitivity to overheating. [less ▲]

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