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See detailDegradation inhibitors and metal additives: impact on solvent degradation
Léonard, Grégoire ULg

Report (2012)

This report is part of a PhD thesis currently taking place at the University of Liège in collaboration with the company Laborelec. A Degradation Test Rig (DTR) has been built in order to evaluate solvent ... [more ▼]

This report is part of a PhD thesis currently taking place at the University of Liège in collaboration with the company Laborelec. A Degradation Test Rig (DTR) has been built in order to evaluate solvent degradation in CO2 capture conditions. Details about degradation effects and about the DTR may be found in a previous report (PhD mid-term report, G. Léonard, 2011). Experiments to study the effect of process conditions on degradation are in progress with 2-ethanolamine (MEA) as benchmark solvent. This report presents first a brief overview of the different degradation mechanisms and associated products, followed by a literature review about metal influence on MEA degradation and a state of the art review about degradation inhibitors. [less ▲]

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See detailUN MILIEU CINÉMATIQUE POUR L'ÉLABORATION D'UNE PRAXÉOLOGIE « MODÉLISATION » DU THÉORÈME FONDAMENTAL DU CALCUL DIFFÉRENTIEL ET INTÉGRAL
Balhan, Kevin ULg

in EMF 2012 - Enseignement des mathématiques et contrat social : Enjeux et défis pour le 21e siècle (2012, April)

The text is related to the calculus’s main theorem learning as it is studied by students in the last year of Belgium secondary school. We make an epistemological analysis of the theorem that inspired us ... [more ▼]

The text is related to the calculus’s main theorem learning as it is studied by students in the last year of Belgium secondary school. We make an epistemological analysis of the theorem that inspired us the set up of a situation composed of four mathematics statements and for which we need rectilinear movements with or without variable speeds, speeding and moving laws, areas, volumes and flows. The suggested strategies for these statements and the reactions will be analysed later. [less ▲]

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See detailVideos in motion: Processes of Transnationalization in the Southern Nigerian Video Industry: Networks, Discourses, Aesthetics
Jedlowski, Alessandro ULg

Doctoral thesis (2012)

On the ground of a three years-long multi-sited, ethnographic research conducted in Southern Nigeria, Italy and the United Kingdom, my PhD dissertation analyzes the processes of transnationalization that ... [more ▼]

On the ground of a three years-long multi-sited, ethnographic research conducted in Southern Nigeria, Italy and the United Kingdom, my PhD dissertation analyzes the processes of transnationalization that have affected the southern Nigerian video film industry (Nollywood) during the first decade of the 2000s, and interpret their significance in relation to the industry’s history and recent developments. Transnationalization processes have affected the industry at different levels, which include its economic and social organization, its international representation, and the narrative and aesthetic features of the films it produces. The dissertation analyzes these different levels through three separated, but interrelated, sections: 1) The Nigerian video industry has experienced a transnational success since its early stages. Thanks to the informality of Nollywood’s network of distribution, pirated copies of Nigerian videos have circulated throughout the world since the mid 90s. Informal and pirated networks of circulation made videos travel long distances and create for the industry a wide transnational audience. However, as this section argues, informal production and distribution strategies and their vulnerability to piracy progressively eroded the industry’s economy. This section then argues that, once the internal Nigerian video market has started to implode because of the excess of informality and the lack of a proper distribution framework, an important section of the industry has explicitly decided to target the transnational audience generated by the global informal circulation of Nigerian video films. New modes of production and circulation emerged, which mainly target local elites and diasporic audiences. A new wave of high budget productions saw the light. The videos’ patterns of mobility transformed and, this impacted on video films’ economic accessibility for local popular audiences. 2) The second section analyzes the way videos’ discursive circulation (that is, the way in which videos, and the video phenomenon in general, have been portrayed, discussed and analyzed both in Nigeria and elsewhere) impacted on the video industry’s transformation. As with the material and economic circulation analyzed in the first section, videos’ discursive circulation interacted with the video phenomenon in at least two ways. On the one hand it made videos travel. It made them cross boundaries and reach audiences they did not even envisaged to reach. On the other hand, it opened for the video industry a field of dynamic confrontation. Nollywood has been compared to other global film industries (such as Bollywood and Hollywood), and it has been criticized for its low production quality standards. The video phenomenon has been celebrated for some of its achievement, and mocked for some of its weaknesses. This complex interaction with the global cinema arena has produced numerous effects on the video industry. Videos entrepreneurs reacted to criticism and engaged into active processes of transformation aimed at making the video industry reach international production quality standards, and escape the marginal position within which much of the mentioned discursive constructions positioned it. 3) The third section looks at videos’ aesthetics and narrative structures. The transnational mobility of the videos impacted on them in multiple ways. On the one hand, as a result of the encounter of both transnational and local aesthetic and narrative aspects, videos developed a particular aesthetic and narrative openness which made them able to address dispersed audiences and reconstitute them into a pan-African public. Through their specific film language, contents, and forms of address videos activated a debate on what it means to be African today, and shaped it around the social, cultural and historic specificities of the post-colonial, post-Structural-Adjustment era in Nigeria and, more generally, in sub-Saharan Africa. On the other hand, mobility intervened in the reformulation of videos’ narrative and aesthetic patterns. The video phenomenon has been adopted and reinterpreted by Nigerian diaporic groups in Europe and elsewhere. The specific social and economic conditions associated with the experience of living in the diaspora interacted with the videos’ production strategies and defined particular narrative and aesthetic solutions. When the Nigerian video industry entered the production crisis diasporic production companies found themselves in the position of an avant-garde in what concerns the industry’s transnational expansion: they had already experimented with economic and aesthetic solutions that could open Nigerian productions to global audiences. As a result, they became the bridge able to connect the Nigerian video film industry to transnational, non-African audiences. [less ▲]

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See detailLa globalisation : cinq thèses et trois scénarios
Jacquemain, Marc ULg

Conference (2012, April)

La communication reprend l'idée de Zaki Laïdi, selon laquelle au-delà de l'accélération des flux économiques, la globalisation doit être considérée comme un transformation des représentations du monde. Il ... [more ▼]

La communication reprend l'idée de Zaki Laïdi, selon laquelle au-delà de l'accélération des flux économiques, la globalisation doit être considérée comme un transformation des représentations du monde. Il propos d'apppliquer cette logique à quelques grands travaux sociologiques récents sur la globalisation et montrer comment ces travaux eux-mêmes contribuent à faconner des "imaginaires" au sens de Zaki Laïdi [less ▲]

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See detailFamilial pituitary adenomas : current concepts and perspectives
jaffrain-Rea, ML; Beckers, Albert ULg

in Abstract book - National Symposium in Endocrinology - Romanian Society of Endocrinology (2012, April)

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See detailLa fréquence des élections
Bouhon, Frédéric ULg

in Bouhon, Frédéric; Reuchamps, Min (Eds.) Les systèmes électoraux de la Belgique (2012)

Ce chapitre vise à présenter les règles juridiques qui déterminent le rythme électoral. Il commence par une courte discussion sur la question de savoir quel laps de temps peut être considéré comme une ... [more ▼]

Ce chapitre vise à présenter les règles juridiques qui déterminent le rythme électoral. Il commence par une courte discussion sur la question de savoir quel laps de temps peut être considéré comme une durée raisonnable pour une législature. Il se poursuit par le passage en revue les normes qui établissent, pour chacune des assemblées élues du pays, la durée qui sépare en principe deux élections , et par l'examen des cas où la législature est écourtée par l’organisation d’élections anticipées. Enfin, le chapitre s'achève par une brève réflexion sur l’opportunité d’une synchronisation des différentes échéances électorales. [less ▲]

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See detailVers une plus grande intégration des outils de conception?
Habran, Maxime ULg

in Revue de la Faculté de Droit de l'Université de Liège (2012)

Mise en évidence des principes relatifs à deux outils de conception, le schéma de développement de l'espace communautaire (SDEC) et le schéma de développement de l'espace régional (SDER)

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See detailSalivary Glucose Oxidase from Caterpillars Mediates the Induction of Rapid and Delayed-Induced Defenses in the Tomato Plant
Tian, Donglan; Peiffer, Michelle; Shoemaker, Erica et al

in PLoS ONE (2012), 7(4), 36168

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See detailGiacomo Casanova: Histoire de ma vie, extraits. Divers extraits de livre. Traductions effectuées pour la mise en scène de "Casanova, Theater mit Figuren"
Casanova, Giacomo; Flem, Lydia; Le Bitouzé, Corinne et al

Article for general public (2012)

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See detailThe oxygen nightglow emissions of Venus: vertical distribution and role of collisional quenching
Gérard, Jean-Claude ULg; Soret, Lauriane ULg; Migliorini, Alessandra et al

Conference (2012, April)

The oxygen nightglow emissions of Venus: vertical distribution and role of collisional quenching J.-C. Gérard (1), L. Soret (1), A. Migliorini (2), G. Piccioni (2), and P. Drossart (3) (1) LPAP ... [more ▼]

The oxygen nightglow emissions of Venus: vertical distribution and role of collisional quenching J.-C. Gérard (1), L. Soret (1), A. Migliorini (2), G. Piccioni (2), and P. Drossart (3) (1) LPAP - Université de Liège - Belgium (jc.gerard@ulg.ac.be, 0032 4 366 9711), (2) INAF - Rome, Italy, (3) LESIA, Observatoire de Paris - Meudon, France Three-body recombination of atomic oxygen produces O2 molecules excited in different electronic states such as a 1∆g, b 1 􏰀+g , A 3 􏰀+u , c 1 􏰀uand A’ 3∆u, each with a specific quantum efficiency. When they radiate, optical transitions are observed in a wide range of wavelengths extending from the ultraviolet to the near infrared. In planetary atmospheres, spontaneous radiative deexcitation compete with collisional quenching with ambient molecules and atoms. As a consequence, the corresponding airglow emission profiles may significantly differ from each other in brightness and altitude of the emitting layer. We model the volume emission rates and limb profiles of the O2 Atmospheric Infrared (a 1∆-X 3 􏰀), Herzberg I (A 3 􏰀-X 3 􏰀), Herzberg II (c 1 􏰀-X 3 􏰀), Chamberlain (A’ 3∆-a 1∆) bands expected on the Venus night side. The quenching rates are taken from laboratory and observational planetary data and we apply two different methods to determine the oxygen and CO2 density profiles. One is based on recent analysis of data collected by instruments on board the Venus Express mission. The second one uses a one-dimensional chemical-diffusive model where the free parameters are the strength of turbulent transport and the downward flux of O atoms. Both approaches indicate that the calculated intensities of each transition range over several orders of magnitude and that differences are expected in the altitude of the maximum emission. These predictions will be compared with VIRTIS/Venus Express limb observations, which make it possible to derive the vertical distribution of the O2 emissions in the visible and infrared. These measurements suggest that no difference is observed between the altitude of the peak of the IR Atmospheric and Herzberg II bands. Conclusions will be drawn about the validity of the current set of quenching coefficients used in the model. [less ▲]

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See detailHigher-Moment Risk Exposures in Hedge Funds
Lambert, Marie ULg; Hübner, Georges ULg; Papageorgiou, Nicolas

Conference (2012, April)

The paper singles out the key roles of US equity skewness and kurtosis in the determination of the market premia embedded in Hedge Fund returns. We propose a conditional higher-moment asset pricing model ... [more ▼]

The paper singles out the key roles of US equity skewness and kurtosis in the determination of the market premia embedded in Hedge Fund returns. We propose a conditional higher-moment asset pricing model with location, trading and higher-moment factors in order to describe the dynamics of the Equity Hedge (Market Neutral, Short Selling and Long/Short strategies), Event Driven, Relative Value, and Funds of Hedge Funds styles. The volatility, skewness and kurtosis implied in the US options markets are used by Hedge Fund managers as instruments to anticipate market movements. Managers should adjust their market exposure in response to variations in the implied higher moments. We show that higher-moment premia improve a conditional asset pricing model both in terms of explanatory power (R-squares and Schwarz criterion) and specification errors across all Hedge Fund styles. [less ▲]

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See detailBiological variations during a race cycling
LE GOFF, Caroline ULg; Kaux, Jean-François ULg; Goffaux, Sébastien et al

in Biomedica 2012 (2012, April)

Background: The metabolic and cardiac impact of a cycling effort on blood biology is not very well described in the literature. We aimed to measure the concentration of different biomarkers (cardiac and ... [more ▼]

Background: The metabolic and cardiac impact of a cycling effort on blood biology is not very well described in the literature. We aimed to measure the concentration of different biomarkers (cardiac and metabolic) released during an international cycling race. Materials and Methods: Venous blood samples of 15 young men (25.1 ± 6.4 y.o.) were collected just before (T1), just after (T2), 3 hours (T3) after an international cycling race of 176 kilometers in Belgium for the determination of cardiac and metabolic biomarkers: red blood cells (RBC) haemoglobin (HgB) creatinin (Cr) highly sensitive troponin T (hsTnT) myoglobin (MYO) NT-proBNP All automated assays were performed according to the manufacter’s specifications. For the statistical analysis, an Anova calculated with the Statistica Software version 9.1 was used. Results: •RBC and HgB levels varied significantly between T0 and T3 (respectively p=0.0026, and p=0.002) (Fig. 1 and 2). • Cr concentration also varied significantly between all times (T0-T1:p<0.0001, T1-T3:p=0.0326 and T0-T3 p=0.0001)(Fig.3). These changes might be related to renal flow depletion during exercise. •MYO increased significantly between T0 and T1 (p<0.0001), but quickly decreased between T1 and T3, however the T3 level stay higher than T0 (p=0.014) (Fig.4). •The stress delivered from the physical activity performed during the race induced a significant variation of hsTnT which increased significantly between T0 and T1 (p<0.0001) and stayed higher 3 hours after the end of the exercise (T0-T3: p<0.0001) (Fig.5) . •The intense exercise delivery by the race induced a significant variation of NT-proBNP, that followed the same kinetic of hsTnT but in smaller proportion. We noticed variations statistically significant between T0 and T1 and between T0 and T3 for NT-proBNP (Fig.6). •These increases of cardiac biomarkers were significant but reasonable and could not allow us to talk about cellular necrosis or irreversible injury. Conclusions: Our results show that stress generated by a cycling race could be the cause for the different metabolic variations observed. Troponin T stays without a doubt the most specific marker for stress related to myocardial tissue. Its increase can then be considered as being of interest. [less ▲]

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See detailDamping identification of lightly damped linear dynamic systems using Common-base Proper Orthogonal Decomposition
Andrianne, Thomas ULg; Dimitriadis, Grigorios ULg

in Mechanical Systems & Signal Processing (2012), 28

This paper presents a new technique to identify the damping of linear systems. It is developed from the Proper Orthogonal Decomposition (POD) of the free response of the system and extended to the ... [more ▼]

This paper presents a new technique to identify the damping of linear systems. It is developed from the Proper Orthogonal Decomposition (POD) of the free response of the system and extended to the recently proposed Common-base POD (CPOD). The present application of CPOD considers simultaneously several free responses of the system to different initial conditions. The eigen-decomposition of the co-variance matrix leads to a unique vector basis which is likely to contain more information about the dynamics of the system than a vector basis obtained by the classic POD technique. The ability of the technique to estimate the mode shapes and the modal damping is demonstrated on a simulated mass-spring-damper system. Two different distributions of masses are considered in order to confront the CPOD analysis to the intrinsic limitation of POD, i.e. that the mode shapes are identified exactly only if the mass matrix is proportional to the identity matrix. It is shown that the identification of the damping is still possible when the modes are not orthonormal. The robustness of the technique is demonstrated in the presence of noise in the responses of the system and through an experimental application with comparison with other identifications techniques. [less ▲]

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See detailUse of ionic liquids for biocatalytic synthesis of sugar derivatives
Galonde, Nadine ULg; Nott, Katherine ULg; Debuigne, Antoine ULg et al

in Journal of Chemical Technology & Biotechnology (2012), 87(4), 451-471

Sugar-based compounds are widely used in pharmaceuticals, cosmetics, detergents and food. They are mainly produced by chemical methods, but the use of enzymes as ‘a greener alternative’ to organic ... [more ▼]

Sugar-based compounds are widely used in pharmaceuticals, cosmetics, detergents and food. They are mainly produced by chemical methods, but the use of enzymes as ‘a greener alternative’ to organic synthesis has been investigated for more than 20 years. Due to the low polar substrate solubility in organic solvents compatible with enzymes, research has focused on the application of substitutes for biocatalysis, especially ionic liquids (ILs). After introducing the main properties of ILs and especially their ability to solubilize sugars, this review focuses on one of their applications, the biocatalytic synthesis of carbohydrate derivatives. In this context, they can be used in pure IL systems, in IL/IL systems or in IL/organic solvent systems. Finally, this review provides an update on the environmental fate of ILs. Their exploitation in ‘green’ processes is still limited due to their low degradability but research is currently under way to design new more ‘eco-friendly’ ILs. [less ▲]

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See detailhe influence of transformational leadership on commitment: New underlying processes
Marique, Géraldine; Stinglhamber, Florence; Hanin, Dorothée et al

Poster (2012, April)

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See detailL'ancien institut de stomatologie à Bavière en sursis
Charlier, Sébastien ULg

in Nouvelles du Patrimoine (Les) (2012), 135

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See detailPlatelet-rich plasma to treat jumper’s knee: preliminary results
Kaux, Jean-François ULg; CROISIER, Jean-Louis ULg; SIMONI, Paolo ULg et al

in Biomedica 2012 (2012, April)

Introduction: Tendinopathies, especially jumper’s knee, often remain rebel to conservative treatments. Several experimental studies have shown the healing properties of platelet and their growth factors ... [more ▼]

Introduction: Tendinopathies, especially jumper’s knee, often remain rebel to conservative treatments. Several experimental studies have shown the healing properties of platelet and their growth factors. Researches have specifically demonstrated the platelets action as mediator and/or enhancer of tissue healing. The aim of our study was to investigate the effect of 1 injection of PRP in patients suffering from chronic jumper’s knee. Our protocol was approved by Ethic Committee of University and University Hospital of Liège. Methods: Patients performed imaging (US and MRI) and functional assessments, and a clinical examination using an algometer, before treatment and 6 weeks after PRP treatment. They were also invited to answer to questionnaire relative to pain and functional status. PRP was obtained from autologous blood using an apheresis system (COM.TEC, Fresenius). The injection of 6mL of PRP was realised without local anaesthesia into the proximal insertion of the patellar tendon. A 48h rest-time was recommended after infiltration. Afterwards, a submaximal eccentric reeducation was initiated 1 week after infiltration 3 times a week during 5 weeks. In case of pain, anti-inflammatory drugs were prohibited and patient were encouraged to take class I or II painbrakers. Results: At this time, 10 patients with jumper’s knee were included in our study. Pre-injection tests revealed pain of the upper part of the patellar tendon just below the patella, associated with loss of function. Imaging exams confirmed diagnosis. Six weeks post-injection, the clinical status was improved in all patients, with a significant decrease of algo-functional scores. The pain reported during functional assessments was decreased (in particular for the eccentric actions), yet no significant improvement of physical performances was observed. We found no significant differences between imaging exams before and 6 weeks after PRP injection. Conclusion: One in situ injection of PRP clinically improved patients with jumper’s knee 6 weeks after treatment. All the 10 patients reported a decrease of pain during day-life and through physical activities. However nor functional performances neither imaging were improved. [less ▲]

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