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See detailReview of the use of Peclet numbers to determine the relative importance of advection and diffusion in low permeability environments
Huysmans, Marijke; Dassargues, Alain ULg

in Hydrogeology Journal (2005), 13(5-6), 895-904

In low permeability environments, transport by advection is often neglected based on a Peclet number criterion. Such a criterion usually states that if the Peclet number (Pe) is much smaller than 1 ... [more ▼]

In low permeability environments, transport by advection is often neglected based on a Peclet number criterion. Such a criterion usually states that if the Peclet number (Pe) is much smaller than 1, diffusion dominates over advection and transport may be modeled considering diffusion only. Unfortunately, up to 10 different Peclet number definitions exist and for a particular case these different definitions lead to very diverse Peclet number values, differing several orders of magnitude from each other. In this paper, the different Peclet number definitions are therefore evaluated on their ability to determine the relative importance of transport by advection and by diffusion in low permeability environments. This is done by comparing the results of the analytical solution for pure diffusion with the analytical solution for diffusion, advection and dispersion for a large number of different input parameter values. The relation between the different Peclet numbers and the difference between the calculated concentration considering diffusion only and the calculated concentration considering both diffusion and advection is studied. These calculations show that some Peclet number definitions are not well suited to decide whether advection may be neglected in low permeability media. [less ▲]

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See detailComparing traffic engineering objective functions
Balon, Simon ULg; Skivée, Fabian; Leduc, Guy ULg

in CoNext 2005 - Student Workshop (2005, October)

We compare and evaluate how well-known and novel network-wide objective functions for Traffic Engineering (TE) algorithms fulfil TE requirements. To compare the objective functions we model the TE problem ... [more ▼]

We compare and evaluate how well-known and novel network-wide objective functions for Traffic Engineering (TE) algorithms fulfil TE requirements. To compare the objective functions we model the TE problem as a linear program and solve it to optimality, thus finding for each objective function the best possible target of any heuristic TE algorithm. Our first results suggest that they can give quite different results. [less ▲]

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See detailHedge fund performance and persistence in bull and bear markets
Capocci, Daniel; Corhay, Albert ULg; Hübner, Georges ULg

in European Journal of Finance (2005), 11(5), 361-392

This paper tests the performance of 2894 hedge funds in a time period that encompasses unambiguously bullish and bearish trends whose pivot is commonly set at March 2000. The database proves to be fairly ... [more ▼]

This paper tests the performance of 2894 hedge funds in a time period that encompasses unambiguously bullish and bearish trends whose pivot is commonly set at March 2000. The database proves to be fairly trustable with respect to the most important biases in hedge funds studies, despite the high attrition rate of funds observed in the down market. An original ten-factor composite performance model is applied that achieves very high significance levels. The analysis of performance indicates that most hedge funds significantly outperformed the market during the whole test period, mostly thanks to the bullish subperiod. In contrast, no significant underperformance of individual hedge funds strategies is observed when markets headed south. The analysis of persistence yields very similar results, with most of the predictability being found among middle performers during the bullish period. However, the "Market Neutral" strategy represents a remarkable exception, as abnormal performance is sustained throughout and significant persistence can be found between the 20% and 69% best performers in this category, probably thanks to an extreme adaptability and a very active investment behaviour.(Abstract EconLit copié le 29/06/06) [less ▲]

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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 detailModulation of angiogenesis during adipose tissue development in murine models of obesity.
Vörös, Gabor; Maquoi, Erik ULg; Demeulemeester, Diego et al

in Endocrinology (2005), 146(10), 4545-4554

Development of vasculature and mRNA expression of 17 pro- or antiangiogenic factors were studied during adipose tissue development in nutritionally induced or genetically determined murine obesity models ... [more ▼]

Development of vasculature and mRNA expression of 17 pro- or antiangiogenic factors were studied during adipose tissue development in nutritionally induced or genetically determined murine obesity models. Subcutaneous (SC) and gonadal (GON) fat pads were harvested from male C57Bl/6 mice kept on standard chow [standard fat diet (SFD)] or on high-fat diet for 0-15 wk and from male ob/ob mice kept on SFD. Ob/ob mice and C57Bl/6 mice on high-fat diet had significantly larger SC and GON fat pads, accompanied by significantly higher blood content, increased total blood vessel volume, and higher number of proliferating cells. mRNA and protein levels of angiopoietin (Ang)-1 were down-regulated, whereas those of thrombospondin-1 were up-regulated in developing adipose tissue in both obesity models. Ang-1 mRNA levels correlated negatively with adipose tissue weight in the early phase of nutritionally induced obesity as well as in genetically determined obesity. Placental growth factor and Ang-2 expression were increased in SC adipose tissue of ob/ob mice, and thrombospondin-2 was increased in both their SC and GON fat pads. mRNA levels of vascular endothelial growth factor (VEGF)-A isoforms VEGF-B, VEGF-C, VEGF receptor-1, -2, and -3, and neuropilin-1 were not markedly modulated by obesity. This modulation of angiogenic factors during development of adipose tissue supports their important functional role in obesity. [less ▲]

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See detailPourquoi tant de flux d’élèves dans les écoles en discrimination positive
Bouchat, Thérèse-Marie; Hindryckx, Geneviève ULg

Conference (2005, October)

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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 detailExploration isocinétique des rotateurs de l’épaule : analyse critique
Forthomme, Bénédicte ULg; Crielaard, Jean-Michel ULg; Croisier, Jean-Louis ULg

in Annales de Réadaptation et de Médecine Physique (2005, October), 48(7), 510

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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 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 detailAn easy and economically viable route for the decoration of carbon nanotubes by magnetite nanoparticles, and their orientation in a magnetic field
Stoffelbach, François; Aqil, Abdelhafid ULg; Jérôme, Christine ULg et al

in Chemical Communications (2005), (36), 4532-4533

A simple, cheap and tunable approach for the decoration of carbon nanotubes by magnetite nanoparticles and their orientation in a magnetic field is reported.

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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 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 detailThermostability and in vitro digestibility of a purified major allergen 2S albumin (Ses i 1) from white sesame seeds (Sesamum indicum)
Moreno, F. J.; Maldonado-Larrosa, Barbara Maria ULg; Wellner, N. et al

in Biochimica et Biophysica Acta (2005), 1752(2), 142-153

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See detailAutour d’un thé
Ozer, Pierre ULg

Article for general public (2005)

Il y a peu, j'étais au Niger, un pays dont, pour une fois, on parlait abondamment car trois millions de personnes souffraient de malnutrition et risquaient d'y laisser la vie à cause d'une saison des ... [more ▼]

Il y a peu, j'étais au Niger, un pays dont, pour une fois, on parlait abondamment car trois millions de personnes souffraient de malnutrition et risquaient d'y laisser la vie à cause d'une saison des pluies déficitaire dans un pays déjà gangrené par la désertification. Et, après des mois d'indifférence puis de tergiversations, les autres pays du grand village planétaire décidèrent de sauver ces moins nantis. In extremis. Notre mission était d'organiser au mieux la distribution de l'aide alimentaire. Et nous voici déjà confrontés à un problème inattendu : l'insuffisance de véhicules pour transporter les vivres dans les villages les plus reculés et difficiles d'accès. Les quelques 4x4 rapidement réquisitionnés ne suffisaient pas. Un soir de vent de sable, j'ai discuté avec les locaux autour du thé. Au détour de notre conversation, je leur ai appris que nous avions en Belgique de gros bolides aux quatre roues motrices appelés « Touareg ». Etonnés, les touaregs, ceux d'appellation d'origine contrôlée, ont observé le silence et m'ont longuement regardé droit dans les yeux. La lune était notre seule lumière, le vent était retombé, et ce silence n'était perturbé que par les pleurs de quelques enfants affamés ne trouvant pas le sommeil. Le plus vieux d'entre eux esquissa alors un large sourire et me dit : « c'est que vos routes sont en très mauvais état ». Alors, je leur ai dissimulé que nous ne connaissions pas les pistes sinon via les images du Paris-Dakar. J'ai gardé pour moi que les routes ravagées par les ravines ou les nids d'autruches comblés par des immondices pour les rendre un temps soit peu carrossables n'existaient pas chez nous. Je ne leur ai pas dit non plus que Bruxelles comptait plus de véhicules tout-terrain que le Niger. Non, je n'ai rien dit de tout cela. J'ai ébauché à mon tour un large sourire et j'ai goûté au deuxième thé, légèrement sucré, le thé de l'amitié, comme ils disent... [less ▲]

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See detailPreparation of new radiation-curing binders
Detrembleur, Christophe ULg; Weikard, Jan; Greszta-Franz, Dorota et al

Patent (2005)

Process for preparing binders including reacting A) one or more NCO-functional compounds containing uretdione groups with B) one or more compounds containing groups capable of participating in ... [more ▼]

Process for preparing binders including reacting A) one or more NCO-functional compounds containing uretdione groups with B) one or more compounds containing groups capable of participating in polymerization reaction with ethylenically unsaturated compounds on exposure to actinic radiation, and contain isocyanate-reactive groups, followed by C) reaction with one or more hydroxyl-containing compounds other than B), wherein at least one of these compounds has an OH functionality of >=2, D) in the presence of one or more compounds containing phenoxide groups, as catalysts, and E) optionally auxiliaries and additives, where the reaction with compounds of component C); proceeds at least proportionally with the formation of allophanate groups and where and including binders containing allophanate groups and groups capable of participating in a polymerization reaction with ethylenically unsaturated compounds on exposure to actinic radiation, and optionally also contain NCO-reactive groups. The binders are used in coating compositions used to coat substrates [less ▲]

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See detailLow viscosity allophanates containing actinically curable groups
Detrembleur, Christophe ULg; Weikard, Jan; Grestza-Franz, Dorota et al

Patent (2005)

A process for preparing binders containing allophanate groups which contain, at the oxygen atom of the allophanate group that is bonded via two single bonds, organic radicals with activated groups capable ... [more ▼]

A process for preparing binders containing allophanate groups which contain, at the oxygen atom of the allophanate group that is bonded via two single bonds, organic radicals with activated groups capable of participating in a polymerization reaction with ethylenically unsaturated compounds on exposure to actinic radiation; the process includes reacting A) one or more compounds containing uretdione groups with B) one or more OH-functional compounds which contain groups capable of participating in a polymerization reaction with ethylenically unsaturated compounds on exposure to actinic radiation, and C) optionally further NCO-reactive compounds, and D) in the presence of one or more compounds containing phenoxide groups, as catalysts.; The binders can be used in preparing coatings, coating materials, coating compositions, adhesives, printing inks, casting resins, dental compounds, sizes, photoresists, stereolithography systems, resins for composite materials and sealants. [less ▲]

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See detailOuvrir les yeux
Rentier, Bernard ULg

Speech/Talk (2005)

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See detailOverhead power lines real time monitoring : a future trend ?
Lilien, Jean-Louis ULg

Conference given outside the academic context (2005)

general overview of ampacity problem in power lines

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