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See detailMICROPOLLUTANTS ISSUES: A MODELLING STUDY OF HEAVY METALS WITHIN TWO FRENCH BASINS AND A TEST APPLICATION TO COCAINE IN BELGIUM
Deliège, Jean-François ULiege; Everbecq, Etienne ULiege; Grard, Aline ULiege et al

Poster (2010, April)

European policies (European Framework Directive: Water 2000/60/CE, Directive 76/464/CE) impose to reduce the releases of about a hundred substances in surface water. In the last years, the AQUAPOLE has ... [more ▼]

European policies (European Framework Directive: Water 2000/60/CE, Directive 76/464/CE) impose to reduce the releases of about a hundred substances in surface water. In the last years, the AQUAPOLE has been involved in two studies related to this matter. First, on the request and with the financial support of both the French Ministry of Environment and ONEMA (“Office National de l’Eau et des Milieux Aquatiques”), INERIS (“Institut National de l’Environnement Industriel et des Risques”) drew up the guidelines of a methodology allowing fixing the local Limit Values to Emission so as to abide by the quality standards on the whole watershed. Within this context, INERIS wishes to test the use of pollutant transfer models on pilot sub-basins. The PEGASE model has been used to simulate micropollutants on two concrete use cases (1): (iii) in the Meuse sub-basin, managed by the French Water Agency Rhine-Meuse, for simulations concerning cadmium and zinc; (iv) in the Adour sub-basin, managed by the French Water Agency Adour-Garonne, for simulations applied to cadmium and copper. The choice of each substances and sub-basins was made by mutual agreement between INERIS, the concerned Water Agencies, and the AQUAPOLE. A major selection criterion for the substances and the sub-basins was the availability of data (sources and in situ measurements). For the second study, the PEGASE model has been adapted to describe the cocaine’s behaviour (using a stable metabolite of the cocaine in the environment: the benzoylecgonine (BZE)) in waste water, waste water treatment plants (WWTP) and surface water (2). The cocaine is newly described in the model as an additional micropollutant (PEGASE already treats numerous heavy metals), thanks to the implementation of new state variable equations and their specific parameterizations. Simulations of BZE have been done in the Walloon and Flemish regions, where many measurements from the COWAT project (3) were available. The first results are showing good agreement between calculated and measured values. The ability of the model to simulate the fate of studied micropollutants (cadmium, zinc, copper, and the cocaine derivatives) in surface waters should be enhanced and extended to other substances and basins. Moreover, additional data still have to be collected and measured. [less ▲]

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See detailEffect of pH on glucose and starch fermentation in batch and sequenced-batch mode with a recently isolated strain of hydrogen-producing Clostridium butyricum CWBI1009
Masset, Julien ULiege; Hiligsmann, Serge ULiege; Hamilton, Christopher ULiege et al

in International Journal of Hydrogen Energy (2010), 35(8), 3371-3378

This paper reports investigations carried out to determine the optimum culture conditions for the production of hydrogen with a recently isolated strain Clostridium butyricum CWBI1009. The production ... [more ▼]

This paper reports investigations carried out to determine the optimum culture conditions for the production of hydrogen with a recently isolated strain Clostridium butyricum CWBI1009. The production rates and yields were investigated at 30 °C in a 2.3 l bioreactor operated in batch and sequenced-batch mode using glucose and starch as substrates. In order to study the precise effect of a stable pH on hydrogen production, and the metabolite pathway involved, cultures were conducted with pH controlled at different levels ranging from 4.7 to 7.3 (maximum range of 0.15 pH unit around the pH level). For glucose the maximum yield (1.7 mol H2 mol-1 glucose) was measured when the pH was maintained at 5.2. The acetate and butyrate yields were 0.35 mol acetate mol-1 glucose and 0.6 mol butyrate mol-1 glucose. For starch a maximum yield of 2.0 mol H2 mol-1 hexose, and a maximum production rate of 15 mol H2 mol-1 hexose h-1 were obtained at pH 5.6 when the acetate and butyrate yields were 0.47 mol acetate mol-1 hexose and 0.67 mol butyrate mol-1 hexose. [less ▲]

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See detailTRANSNATIONAL MODELING OF THE SURFACE WATER QUALITY OF THE INTERNATIONAL RIVER BASIN DISTRICT MEUSE WITH PEGASE
Deliège, Jean-François ULiege; Everbecq, Etienne ULiege; Grard, Aline ULiege

Poster (2010, April)

The PEGASE Model has been applied at the entire International River Basin District of the Meuse. The poster presents different sub-basin applications on (i) the Chiers (Luxembourg + Belgium Walloon Region ... [more ▼]

The PEGASE Model has been applied at the entire International River Basin District of the Meuse. The poster presents different sub-basin applications on (i) the Chiers (Luxembourg + Belgium Walloon Region and French Rhin-Meuse Basin, 2000-2006) for the reference years 2000 and 2002 and prospective scenario 2015, (ii) International simulation performed (during 2005-2006) upstream (up to the Belgian border) for the reference year 2002, (iii) Current coordination between BE-Flemish Region and NL for downstream simulations of historical situation and (iv) prospective scenarios : International databases for a single reference year on the whole Meuse District [less ▲]

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See detailExercise echocardiography in severe asymptomatic aortic stenosis.
O'Connor, K.; LANCELLOTTI, Patrizio ULiege; Donal, E. et al

in Archives of Cardiovascular Diseases (2010), 103(4), 262-269

The management of asymptomatic patients with severe aortic stenosis is challenging. Unfortunately, evaluation of symptoms such as dyspnoea remains subjective. The use of exercise echocardiography may help ... [more ▼]

The management of asymptomatic patients with severe aortic stenosis is challenging. Unfortunately, evaluation of symptoms such as dyspnoea remains subjective. The use of exercise echocardiography may help to predict major events in patients with asymptomatic severe aortic stenosis. This article explains how to perform the test and discusses which echocardiographic measurements should be obtained, focusing on the diagnostic and prognostic value of these measurements. An increase in mean transaortic pressure gradient >or= 18 mmHg predicts a worse prognosis in patients with severe aortic stenosis. The absence of left ventricular contractile reserve also has an important prognostic impact. Evaluation of filling pressures and looking for a worsening or a new mitral regurgitation are also part of the exam. Further studies are required to determine whether surgery should be recommended in the presence of an abnormal exercise echocardiogram in severe asymptomatic aortic stenosis. [less ▲]

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See detailEditorial : Hommage à Pierre Pescatore
Sibony, Anne-Lise ULiege

in Revue de la Faculté de Droit de l'Université de Liège (2010), (4), 419-420

Presentation of a special issue in honour of Pierre Pescatore

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See detailEvaluation du temps de mélange à partir de la distribution temporelle du libre parcours dans une salle
Billon, Alexis ULiege; Dirix, Simon; Embrechts, Jean-Jacques ULiege

in Actes du 10ème Congrès Français d'Acoustique (2010, April)

Dans un espace clos où se mélangent les nombreuses ondes réfléchies, diffusées et diffractées par les surfaces, la propagation de l’énergie sonore peut être décomposée en deux étapes: tout d’abord, un ... [more ▼]

Dans un espace clos où se mélangent les nombreuses ondes réfléchies, diffusées et diffractées par les surfaces, la propagation de l’énergie sonore peut être décomposée en deux étapes: tout d’abord, un processus déterministe pour lequel il est possible d’identifier individuellement chaque contribution, suivi d’un processus stochastique pour lequel les contributions doivent être globalisées et vues comme un processus quasi-aléatoire. Le seuil de transition entre les deux comportements est matérialisé dans l’échogramme par le temps de mélange. Dans cette étude, le temps de mélange est analysé en regard de la distribution temporelle du libre parcours. Celle-ci est obtenue numériquement à l’aide du programme de tir de rayons large bande Salrev. Dans un premier temps, le mélange est identifié au travers du caractère asymptotique de cette distribution. Le temps de mélange est alors défini comme la durée (mesurée à partir de l’instant d’émission au départ de la source) nécessaire pour atteindre ce comportement asymptotique. A partir de cette définition du temps de mélange sont étudiées les influences de divers paramètres géométriques et acoustiques. Ensuite, trois applications pour des salles de concert sont réalisées. Cette étude montre que les valeurs obtenues pour le temps de mélange convergent vers celles observées expérimentalement, à condition que les parois de la salle soient suffisamment diffusantes. [less ▲]

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See detailRecherche des intersections rayon-surfaces par classement préférentiel dans un logiciel d'acoustique des salles
Lesoinne, Stéphane ULiege; Embrechts, Jean-Jacques ULiege

in Actes du 10è Congrès Français d'Acoustique (2010, April)

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See detailLa sauvegarde des archives du Groupe L'Equerre ou la reconnaissance de l'architecture moderne en Wallonie
Charlier, Sébastien ULiege; Burniat, Patrick; Duchesne, Jean-Patrick ULiege et al

in Nouvelles du Patrimoine (Les) (2010), (127), 18-19

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See detailAir-sea ice CO2 fluxes measurement with eddy-covariance micrometeorological technique
Heinesch, Bernard ULiege; Aubinet, Marc ULiege; Carnat, Gauthier et al

Conference (2010, April)

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See detailMicrometeorological survey of air-sea ice CO2 fluxes in arctic coastal waters
Heinesch, Bernard ULiege; Tison, Jean-Louis; Carnat, Gauthier et al

in Geophysical Research Abstracts (2010), 12(EGU2010-10570),

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See detailEtude de l’impact des nouvelles technologies sur les stratégies opératoires des chirurgiens par l’analyse des communications sur le terrain
Blavier, Adelaïde ULiege; Nyssen, Anne-Sophie ULiege

in Travail Humain (Le) (2010), 73(2), 123-140

This study aimed to analyse the impact of the introduction of new technologies in the complex and dynamic field of surgery according to the expertise. The medical sector is one of the most investigated in ... [more ▼]

This study aimed to analyse the impact of the introduction of new technologies in the complex and dynamic field of surgery according to the expertise. The medical sector is one of the most investigated in ergonomics and work psychology studies. Although the study of this phenomenon is not new, our purpose is relevant because of the rapid introduction of new technology in surgery (with very few studies on its organisational impact), its implication for surgeon’s training and the risks for the patient. Furthermore, our conclusions might be extended to other complex work situations. Surgery has considerably evolved and a lot of interventions are now performed by laparoscopy: in this procedure, a camera and the instruments are introduced into very small incisions in the skin and surgeons guide their movements by watching a 2D screen. This technique involves some disadvantages (principally, a 2D view and instruments with low dexterity) that are now removed by a new robotic system (Da Vinci Robotic System). Nevertheless, if this new system offers some essential advantages, it provokes many changes and new constraints in the way to operate and in the role and status of all actors: with this system, the surgeon is isolated and operates with a 3D view and high dexterity instruments while the rest of the team has to manage with a 2D view and instruments with very low dexterity. By all these aspects, the new system may generate different situational references for each actor and might be at the origin of new human errors. In this context, we evaluated the adaptation processes and the changes produced by this system using the communication analysis. In a first field study, we evaluated the impact of its introduction on short-term adaptation processes by a comparison of the communications in classical laparoscopy with the communications with the robotic system. In a second study, we analysed the difference between novices and experts using this system in order to emphasize the long-term adaptation evolution and the steps in the training with this system. Our results showed that the robotic system was more complex and necessitates a long adaptation time when subjects were novices. This complexity led to an increase in the communications between the team members in order to construct common action references despite of diverse quality images. Our data from the second study showed that all categories of communication do not have the same role in the adaptation process and that their occurrence varied according to the expertise level. Indeed, the novice-expert comparison allowed us to emphasize which communications were necessary in the learning phase and which communications were permanent and thus useful for experts too. We showed that the communications might be distinguished in two main types: (1) some were necessary for the learning and disappeared with expertise, these communications concerned the spatial orientation and manipulation categories, (2) while communications about order and confirmation did not decrease and seemed to be indispensable for an accurate cooperative work and common situation awareness. These communications show an accommodation process that transforms the activity by a work division. This last finding is relevant because robotic surgery is similar to the remote control situations in which communications constitute the only way to construct and keep a same situational reference for all involved actors. [less ▲]

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See detailDésertification au Sahel: Historique et perspectives
Ozer, Pierre ULiege; Hountondji, Yvon ULiege; Niang, Abdoul Jelil et al

in Bulletin de la Société Géographique de Liège (2010), 54

Over the last decades, the Sahel of West Africa has suffered two dramatic contiguous droughts. Currently, and since the late 1980s, rainfall amounts tend to catch up with the pre-1970 levels. However ... [more ▼]

Over the last decades, the Sahel of West Africa has suffered two dramatic contiguous droughts. Currently, and since the late 1980s, rainfall amounts tend to catch up with the pre-1970 levels. However, this improvement seems to occur through increased rainfall intensities but the duration of the rainy season did not significantly change since the 1970s and the 1980s. On the other hand, the Sahelian population has tripled since 1950 and it is foreseen to be multiplied by 10 by the second half of the 21st century. Increasing urban population levels are still much more impressive and cause profound environmental degradation. Such an increasing human pressure leads to uncontrolled deforestation in order to satisfy the needs in fuel and construction wood and to make place for shifting cultivation. In addition, larger and larger herds occupying contracting pasture areas leads to overgrazing and trampling. All these processes provoke the degradation of the vegetation cover, a constant diminution of crop yields, and a strong reduction of the biodiversity. This article provides a state of the art of recent findings and controversy that surround the desertification processes. We conclude that, if the droughts of the 1970s and 1980s have had dramatic consequences for the population of the Sahel, the future very high human pressure on the environment will most likely enhance the desertification of the southern fringe of the Sahara, especially in the case of the alarming climate change scenarios forecasting rainfall decrease all over the Sahel. [less ▲]

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See detailFinancement des missions de prévention des services externes de prévention et de protection au travail
Mairiaux, Philippe ULiege; Chanteux, Anne ULiege; Schleich, Eveline et al

Report (2010)

voir résumé du rapport de recherche sur : http://www.emploi.belgique.be/WorkArea/showcontent.aspx?id=31670

Detailed reference viewed: 93 (8 ULiège)
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See detail'Securities litigation' – questions de droit international privé
Wautelet, Patrick ULiege

Conference (2010, April)

Cette présentation, destinée à un événement privé, tente d'offrir une synthèse des règles de droit international privé pertinentes dans le contexte des litiges intéressant les marchés financiers. L'accent ... [more ▼]

Cette présentation, destinée à un événement privé, tente d'offrir une synthèse des règles de droit international privé pertinentes dans le contexte des litiges intéressant les marchés financiers. L'accent est mis en particulier sur les litiges relatifs aux offres de titres. Les questions classiques de droit international privé (compétence internationale, droit applicable) sont étudiées en prenant appui sur les règles européennes de droit international privé. La perspective choisie est celle d'une application en Belgique de ces règles. La perspective se veut pédagogique plus que scientifique. [less ▲]

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See detailCompte rendu de l'ouvrage de E. Danblon et al. (dir.), Argumentation et narration
Provenzano, François ULiege

in Argumentation et Analyse du Discours (2010), 4

Detailed reference viewed: 41 (6 ULiège)