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See detailCorrelation law for SMD in high viscous liquids
Vetrano, Maria-Rosaria; Lebeau, Frédéric ULg; Rambaud, Patrick et al

Conference (2008, September)

Spray characterization, i. e. a velocity map of the liquid and gaseous phases and the sizing of the liquid droplet, remains of a great importance in different industrial applications such as in the ... [more ▼]

Spray characterization, i. e. a velocity map of the liquid and gaseous phases and the sizing of the liquid droplet, remains of a great importance in different industrial applications such as in the automotive or pharmaceutical industries. Correlations capable to faster this characterization already exist. They allow the evaluation of the droplet Sauter Mean Diameter in a precise location of the spray using non-dimensional numbers involving physical and chemical properties of the liquid and the spray operative conditions. This paper concerns the possibility to include in the correlative laws also the effect of the liquid viscosity through the introduction of the Ohnesorge number (Oh). In order to achieve this goal an extensively experimentalcampaign is performed, by means of a Phase Doppler Interferometer, for size and velocity measurements in a full cone spray. Parameters as the hydraulic diameter of the nozzle, the operatingpressure and the liquid viscosity are varied in order to cover large range of Weber and Ohnesorge numbers. [less ▲]

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See detailLe bilan langagier de l'enfant dysphasique
Maillart, Christelle ULg; Orban, Andrée

in ANAE : Approche Neuropsychologique des Apprentissages chez l'Enfant (2008), 20(20), 211-220

Poser le diagnostic de dysphasie est un acte complexe qui ne peut se faire que dans le cadre d’une évaluation multidisciplinaire. Certains critères d’exclusion doivent en effet être respectés : les ... [more ▼]

Poser le diagnostic de dysphasie est un acte complexe qui ne peut se faire que dans le cadre d’une évaluation multidisciplinaire. Certains critères d’exclusion doivent en effet être respectés : les troubles langagiers ne peuvent être expliqués en terme de retard mental, perte auditive, maladie neurologique, déprivation environnementale ou trouble émotionnel. Le bilan langagier a un rôle important dans cette évaluation puisqu’il doit, entre autres, permettre de mettre en évidence des marqueurs psycholinguistiques d’inclusion. Cet article sera ciblé sur le bilan orthophonique (logopédique) de l’enfant dysphasique. L’accent sera principalement mis sur la phase de dépistage, d’identification des difficultés mais aussi des ressources de l’enfant. [less ▲]

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See detailMacro Minitab pour l'analyse discriminante logistique
Palm, Rodolphe ULg

Software (2008)

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See detailFrom Hard to Soft Enforcement of EC Competition Law - A Bestiary of Sunshine Enforcement Instruments
Petit, Nicolas ULg; Rato, Miguel

in Alternative Enforcement Techniques in EC Competition Law (2008)

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See detailTrois questions à Nicolas Petit
Petit, Nicolas ULg

Article for general public (2008)

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See detailEVALUATION DE L’IMPACT DES PROPRIÉTÉS TENSIOACTIVES ET D’HYDROPHOBICITÉ DE SURFACE SUR LE TRANSFERT GAZ-LIQUIDE AU SEIN D’UN RÉACTEUR BIPHASIQUE ET SON EXTRAPOLATION
Gillet, Sébastien ULg

Master's dissertation (2008)

Ce travail de fin d'étude est situé dans le contexte général du traitement biologique des effluents gazeux et en particulier dans l’utilisation, à cette fin, de réacteurs biphasiques (TPPB). Les ... [more ▼]

Ce travail de fin d'étude est situé dans le contexte général du traitement biologique des effluents gazeux et en particulier dans l’utilisation, à cette fin, de réacteurs biphasiques (TPPB). Les précédentes études réalisées sur le sujet ont permis de caractériser les potentialités, notamment en termes de biodégradabilité, d’un tel système. Ces réacteurs, développés à l’échelle du laboratoire, semblent présenter un grand intérêt, notamment dans le cas de traitement de volumes d’air fortement concentrés en polluants (env. 6 g/l). Il semble toutefois utile de prouver que l’application du même procédé à une échelle supérieure n’engendre pas de complications, en matière d’homogénéisation des deux phases. Sachant que l’étape limitante de tels procédés est le transfert de masse du polluant ou de l’oxygène, et que les mécanismes régissant ces types de transferts en systèmes binaires (voire ternaires) sont mal connus, il s’avère utile d’essayer de mieux les comprendre afin de garantir au réacteur un fonctionnement optimum. L’objectif de ce mémoire était donc d’une part d’évaluer la faisabilité d’une extrapolation du système biphasique et d’autre part de mieux comprendre l’impact de ses différents constituants sur le transfert de masse gaz-liquide. [less ▲]

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See detailDraft overview paper on trend analysis in groundwater summarizing the main results of TREND2 in relation to the new Groundwater Directive
Broers, H.P.; Visser, A.; Bierkens, M.F.P. et al

Report (2008)

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See detailReevaluation of the role of VEGF-B suggests a restricted role in the revascularization of the ischemic myocardium .
Li, X.; Tjwa, M.; Van Hove, I. et al

in Arteriosclerosis and Thrombosis : A Journal of Vascular Biology (2008), 28(9), 1614-20

OBJECTIVE: The endogenous role of the VEGF family member vascular endothelial growth factor-B (VEGF-B) in pathological angiogenesis remains unclear. METHODS AND RESULTS: We studied the role of VEGF-B in ... [more ▼]

OBJECTIVE: The endogenous role of the VEGF family member vascular endothelial growth factor-B (VEGF-B) in pathological angiogenesis remains unclear. METHODS AND RESULTS: We studied the role of VEGF-B in various models of pathological angiogenesis using mice lacking VEGF-B (VEGF-B(-/-)) or overexpressing VEGF-B(167). After occlusion of the left coronary artery, VEGF-B deficiency impaired vessel growth in the ischemic myocardium whereas, in wild-type mice, VEGF-B(167) overexpression enhanced revascularization of the infarct and ischemic border zone. By contrast, VEGF-B deficiency did not affect vessel growth in the wounded skin, hypoxic lung, ischemic retina, or ischemic limb. Moreover, VEGF-B(167) overexpression failed to enhance vascular growth in the skin or ischemic limb. CONCLUSIONS: VEGF-B appears to have a relatively restricted angiogenic activity in the ischemic heart. These insights might offer novel therapeutic opportunities [less ▲]

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See detailQuatre cas de dysgerminomes
Desirotte, Gaëlle ULg; Pintiaux, Axelle ULg; Foidart, Jean-Michel ULg et al

in Revue Médicale de Liège (2008), 63(9), 523-7

Dysgerminoma is an ovarian germ cell tumor occurring more frequently among young women. The efficacy of chemotherapy allows conservative surgery sparing fertility. A stadification surgery will avoid ... [more ▼]

Dysgerminoma is an ovarian germ cell tumor occurring more frequently among young women. The efficacy of chemotherapy allows conservative surgery sparing fertility. A stadification surgery will avoid chemotherapy for patients with stage Ia. The others stages will receive a cisplatine-based regime. A ct-scan is performed twice a year and, in case of recurrence, a first or a second chemotherapy should be prescribed. [less ▲]

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See detailEffect of pre-emptive Vagus Nerve Stimulation on cortical spreading depression in rat
Multon, Sylvie ULg; Prodanov, D.; Chauvel, Virginie ULg et al

Poster (2008, September)

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See detailStatistical Analysis of the night weather conditions favouring the epidemic of the brown rust in the Grand-Duchy of Luxemburg.
El Jarroudi, Moussa ULg; Tychon, Bernard ULg; Maraite, Henri et al

in Italian Journal of Agronomy/ Rivista di Agronomia (2008), 3

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See detailCOSMOGRAIL: the COSmological MOnitoring of GRAvItational lenses - VII. Time delays and the Hubble constant from WFI J2033-4723
Vuissoz, Christel; Courbin, F.; Sluse, Dominique ULg et al

in Astronomy and Astrophysics (2008), 488(2), 481-490

Gravitationally lensed quasars can be used to map the mass distribution in lensing galaxies and to estimate the Hubble constant H-0 by measuring the time delays between the quasar images. Here we report ... [more ▼]

Gravitationally lensed quasars can be used to map the mass distribution in lensing galaxies and to estimate the Hubble constant H-0 by measuring the time delays between the quasar images. Here we report the measurement of two independent time delays in the quadruply imaged quasar WFI J2033-4723 (z = 1.66). Our data consist of R-band images obtained with the Swiss 1.2 m EULER telescope located at La Silla and with the 1.3 m SMARTS telescope located at Cerro Tololo. The light curves have 218 independent epochs spanning 3 full years of monitoring between March 2004 and May 2007, with a mean temporal sampling of one observation every 4th day. We measure the time delays using three different techniques, and we obtain Delta t(B-A) = 35.5 +/- 1.4 days (3.8%) and Delta t(B-C) = 62.6(-2.3)(+4.1) days ((+6.5%)(-3.7%)), where A is a composite of the close, merging image pair. After correcting for the time delays, we find R-band flux ratios of F-A/F-B = 2.88 +/- 0.04, F-A/F-C = 3.38 +/- 0.06, and F-A1/F-A2 = 1.37 +/- 0.05 with no evidence for microlensing variability over a time scale of three years. However, these flux ratios do not agree with those measured in the quasar emission lines, suggesting that longer term microlensing is present. Our estimate of H-0 agrees with the concordance value: non-parametric modeling of the lensing galaxy predicts H-0 = 67(-10)(+13) km s(-1) Mpc(-1), while the Single Isothermal Sphere model yields H-0 = 63(-3)(+7) km s(-1) Mpc(-1) (68% confidence level). More complex lens models using a composite de Vaucouleurs plus NFW galaxy mass profile show twisting of the mass isocontours in the lensing galaxy, as do the non-parametric models. As all models also require a significant external shear, this suggests that the lens is a member of the group of galaxies seen in field of view of WFI J2033-4723. [less ▲]

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See detailLivre Blanc Céréales - Gembloux - Informations avant les semis
De Proft, Michel; Bodson, Bernard ULg

Book published by Gembloux Agro-Bio Tech - Edition Septembre 2008 (2008)

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See detailEtude de l'impact des contaminations métalliques sur les propriétés des sols autour de Lubumbashi
Andres, Ludovic ULg

Master's dissertation (2008)

Cette étude est une contribution à la caractérisation des propriétés physicochimiques des sols de Lubumbashi, chef-lieu de la province du Katanga, dans le sud-est de la République Démocratique du Congo ... [more ▼]

Cette étude est une contribution à la caractérisation des propriétés physicochimiques des sols de Lubumbashi, chef-lieu de la province du Katanga, dans le sud-est de la République Démocratique du Congo. Cette zone minière a fait l’objet d’une caractérisation géomorphopédologique afin d’établir un référentiel pédologique et un constat sur l’état des teneurs en éléments traces métalliques (ETM). Le site de notre étude a été subdivisé en deux unités géomorphopédologiques : les plateaux et versants d’une part et les fonds de vallée d’autre part. Ces unités ont été caractérisées grâce à deux toposéquences établies à partir de la cheminée de la Gécamines, située au centre de Lubumbashi. Ces unités ont été comparées à des sites non ou peu contaminés pour améliorer la compréhension des caractéristiques pédologiques. Des sondages, des profils et des miniprofils ont permis d’évaluer la variabilité des propriétés du sol et d’illustrer l’ensemble de la zone d’étude. Chaque horizon a été échantillonné pour être analysé en laboratoire. Certains de ces échantillons ont subi des analyses complémentaires en vue d’apprécier les teneurs totales en ETM (cuivre, cobalt, plomb, cadmium et zinc). Il en ressort que les deux unités étudiées ont des caractéristiques différentes. Les sols de plateaux et versants sont plus acides et contiennent plus d’ETM que les sols des fonds de vallée. Ceux-ci ont une teneur en argile et en ETM augmentant avec la profondeur. [less ▲]

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See detailAutomatic plastic-hinge analysis and design of 3D steel frames
Hoang, Van Long ULg

Book published by University of Liege (2008)

A rather complete picture of automatic plastic-hinge analysis onto steel frames under static loads is made in the present thesis. One/two/three-linear behaviours of mild steel are considered. The frames ... [more ▼]

A rather complete picture of automatic plastic-hinge analysis onto steel frames under static loads is made in the present thesis. One/two/three-linear behaviours of mild steel are considered. The frames are submitted to fixed or repeated load. The geometric nonlinearity is taken into account. The beam-to-column joints of structures could be rigid or semi-rigid. The compact or slender cross-sections are examined. The investigation is carried out using direct or step-by-step methods. Both analysis and optimization methodologies are applied. From the fundamental theory to the computer program aspect are presented. Various benchmarks in open literatures are tested demonstrating the efficiency of the implementation. [less ▲]

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See detailPerception et représentations de l'espace architectural
Van de Vreken, Anne ULg

Master's dissertation (2008)

Tout projet d'architecture est le résultat de l'interaction entre la perception, l'imagination et la représentation d'un espace. La perception recompose les images de l'environnement extérieur que l'on ... [more ▼]

Tout projet d'architecture est le résultat de l'interaction entre la perception, l'imagination et la représentation d'un espace. La perception recompose les images de l'environnement extérieur que l'on perçoit par nos sens : elle explore le monde. L'imagination façonne les images d'une réalité intérieure, qu'il s'agisse de souvenirs d'expériences passées ou des projections d'un futur imaginé. La représentation de l'espace, au sens large, consiste d'abord en la sélection, l'organisation et la présentation d'informations destinées à un public particulier. Bien entendu, l'information donnée doit demeurer exacte et sa présentation ne doit pas la déformer, c'est la responsabilité même du concepteur qui est engagée sur ce point. Ce dernier devient un convertisseur d'idées en représentations qu'un public donné pourra facilement comprendre. Ce travail de fin d'étude se partage en deux parties : La première partie consiste en un état de l'art, faisant essentiellement appel aux théories de l'architecture et de la psychologie. La seconde partie s'attache à répondre à la question : quelle est la meilleure représentation d'un espace pour un non architecte ? Pour y répondre, une expérience visant à comparer l'efficacité et l'impact de trois types de représentations classiquement utilisés en architecture (à savoir le plan, la maquette en carton et la visite virtuelle d'un modèle 3D) pour la perception des ambiances a été mise en oeuvre : elle consiste à comparer les jugements de novices en architecture sur 32 critères d'ambiance basés sur l'utilisation de ces trois types de représentations (T1) aux jugements effectués par les mêmes participants sur les mêmes critères dans l'espace réel (T2). Pour chacun des critères, deux types d'analyses ont été effectuées : (1) les différences entre les représentations en T1 et (2) les différences entre les facteurs d'ambiance perçus sur base de la représentation (T1) et de la visite réelle (T2). Enfin, cette deuxième partie conclut, à partir des résultats issus de ces analyses, sur des recommandations pour des systèmes visant à faire percevoir la qualité des ambiances du bâtiment. [less ▲]

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See detailLa matière picturale comme limite à l’ekphrasis dans les romans sur l’art de la seconde moitié du XIXe siècle
Wicky, Erika ULg

in Loxias : Littératures Française et Comparées (2008), (22),

Painting material as a boundary of ekphrasis in art novels of the 19th century. In the 19th century, an increasing degree of autonomy in the visual arts and the claims laid by painters on the materials ... [more ▼]

Painting material as a boundary of ekphrasis in art novels of the 19th century. In the 19th century, an increasing degree of autonomy in the visual arts and the claims laid by painters on the materials used in their artwork fundamentally modified the relationship between painting and literature. While academic painting still called for smooth and transparent paintings that were perceived as an "open window" onto the world, modern painting started to build up extra layers of paint, showing off relief and textural effects a trend that caused the tactile to invade the visual. Authors of ekphrases were confronted with the following question : how to describe painting material whereas it represents nothing ? The analysis of the status given to painting materials in art novels suggests that it is the Achilles' heel of their ambition for realism. Nevertheless, the boundary could be crossed by intensifying the reflexivity that effectuated a shift in the relationship between painting and literature. Thus, authors gave up trying to describe the reality as if it were a painting and opted to treat it the same way a painter would do it, by handling their own primary materials. [less ▲]

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See detailTesting the forward modeling approach in asteroseismology. I. Seismic solutions for the hot B subdwarf Balloon 090100001 with and without a priori mode identification
Van Grootel, Valérie ULg; Charpinet, Stéphane; Fontaine, Gilles et al

in Astronomy and Astrophysics (2008), 488

Context: Balloon 090100001, the brightest of the known pulsating hot B subdwarfs, exhibits simultaneoulsy both short- and long-period pulsation modes, and shows relatively large amplitudes for its ... [more ▼]

Context: Balloon 090100001, the brightest of the known pulsating hot B subdwarfs, exhibits simultaneoulsy both short- and long-period pulsation modes, and shows relatively large amplitudes for its dominant modes. For these reasons, it has been studied extensively over the past few years, including a successful experiment carried out at the Canada-France-Hawaii Telescope to pin down or constrain the value of the degree index ℓ of several pulsation modes through multicolor photometry. Aims: The primary goal of this paper is to take advantage of such partial mode identification to test the robustness of our standard approach to the asteroseismology of pulsating subdwarf B stars. The latter is based on the forward approach whereby a model that best matches the observed periods is searched for in parameter space with no a priori assumption about mode identification. When successful, this method leads to the determination of the global structural parameters of the pulsator. As a bonus, it also leads, after the fact, to complete mode identification. For the first time, with the availability of partial mode identification for Balloon 090100001, we are able to evaluate the sensitivity of the inferred seismic model to possible uncertainty in mode identification. Methods: We carry out a number of exercises based on the double optimization technique that we developed within the framework of the forward modeling approach in asteroseismology. We use the set of ten periods corresponding to the independent pulsation modes for which values of ℓ have been either formally identified or constrained through multicolor photometry in Balloon 090100001. These exercises differ in that they assume different a priori mode identification. Results: Our primary result is that the asteroseismic solution stands very robust, whether or not external constraints on the values of the degree ℓ are used. Although this may come as a small surprise, the test proves to be conclusive, and small differences in mode identification among the ten modes do not affect in any significant way, at the typical accuracy presently achieved, the final emergent seismic model. This is due to the structure of the p-mode pulsation spectra in sdB stars. In all cases, the inferred structural parameters of Balloon 090100001 remain practically unchanged. They correspond, and this constitutes our second important result, to a star beyond the TAEHB with T_eff = 28 000 ± 1 200 K, log g = 5.383 ± 0.004, M⋆/Msun = 0.432 ± 0.015, and log{M_env/M⋆} = -4.89 ± 0.14. Other structural parameters are also derived. [less ▲]

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See detailAdaptation of a soil heterotrophic respiration model to an agricultural soil.
Buysse, Pauline ULg; Le Dantec, Valérie; Sagnier, Charlotte et al

Poster (2008, September)

This work aimed at adapting a model of soil heterotrophic respiration to an agricultural soil situated in the Hesbaye region (Belgium) and cultivated with a sugar beet / winter wheat / potato/ winter ... [more ▼]

This work aimed at adapting a model of soil heterotrophic respiration to an agricultural soil situated in the Hesbaye region (Belgium) and cultivated with a sugar beet / winter wheat / potato/ winter wheat rotation. This model would be integrated as a sub routine in a larger model describing soil respiration and soil carbon content evolution in crops and that will include autotrophic respiration and CO2 diffusion in soil. The present model is run at a daily time step and at the ecosystem spatial scale and is derived from the CENTURY model. Model parameterisation was performed on the basis of literature survey and of data collected at the Carboeurope agricultural site of Lonzée. Soil characteristics were determined on the basis of analyses performed on loamy soils, typical of the Hesbaye region. Driving variables (meteorological variables and litter input) were obtained during a 4 year measurement campaign performed at the Lonzée experimental site. Biochemical parameters for wheat, potato and sugar beet crops were collected from literature. However, a large parameter variability was noticed as well as a lack of information concerning sugar beet and potato. A sensitivity analysis was performed in order to classify the different parameters in terms of their impact on the respiration rate and carbon contents of each pool. It showed that the most important parameters were those controlling the temperature response, the litter input and its nitrogen and lignin content. The sensitivity analysis also showed differences in parameter impact between short and long term, notably because of pool stabilisation dynamics and crop residue types. This analysis allowed defining the further experiments that need to be developed in order to improve model adjustment on experimental data. [less ▲]

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