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See detailL'articulation des différentes échelles d'observation : le cas d'une recherche sur la coopération roumaine au développement
Teclu, Codrat Alin ULg

Conference (2011)

L'objectif de cette communication est de présenter un aperçu des essais et erreurs que nous avons fait lors de nos deux premières années de thèse afin de concilier le niveau micro-sociologique ... [more ▼]

L'objectif de cette communication est de présenter un aperçu des essais et erreurs que nous avons fait lors de nos deux premières années de thèse afin de concilier le niveau micro-sociologique (interactionniste) avec une échelle plus méso et macro. Après être successivement tombés dans le piège de la démesure empirique puis de la fuite en avant théorique, nous avons finalement réussi à mieux articuler les différents niveaux en choisissant le processus de légitimation comme "centre de gravité" de notre recherche. [less ▲]

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See detailType III frontal sinusotomy: surgical technique, indications, outcomes, a multi-university retrospective study of 120 cases.
Eloy, P.; Vlaminck, S.; Jorissen, M. et al

in B-ENT (2011), 7 Suppl 17

Draf in 1991. The procedure--which is also known as the modified endoscopic Lothrop procedure--aims to create the largest possible anteroposterior and lateral to lateral opening between both frontal ... [more ▼]

Draf in 1991. The procedure--which is also known as the modified endoscopic Lothrop procedure--aims to create the largest possible anteroposterior and lateral to lateral opening between both frontal sinuses and the nasal cavities. This requires the resection of the medial floor of both frontal sinuses, the intersinus septum and the superior nasal septum. The authors present a retrospective study including a cohort of 120 patients who underwent surgery in six Belgian university ENT departments. Mean follow-up was 24.6 months (range: 5-36 months). This paper describes the surgical procedure and reviews the indications, comorbidities, outcomes and complications of the type III frontal sinusotomy. Some correlations are also established with the data published in the worldwide literature. The authors conclude that the Draf III is a demanding procedure requiring considerable expertise in endoscopic sinus surgery. The procedure is effective with a success rate of 87.5%. Indeed, 12.5% of patients only experienced closure of the neoostium while 20% of all the patients had unchanged or worse symptomatology. The percentage of post-operative complications is 7.5%. All complications were managed successfully. [less ▲]

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See detailOptimization of multibody systems and their structural components
Bruls, Olivier ULg; Lemaire, Etienne ULg; Duysinx, Pierre ULg et al

in Blajer, W.; Arczewski, K.; Fraczek, J. (Eds.) et al Multibody Dynamics: Computational Methods and Applications (2011)

This work addresses the optimization of flexible multibody systems based on the dynamic response of the full system with large amplitude motions and elastic deflections. The simulation model involves a ... [more ▼]

This work addresses the optimization of flexible multibody systems based on the dynamic response of the full system with large amplitude motions and elastic deflections. The simulation model involves a nonlinear finite element formulation, a time integration scheme and a sensitivity analysis and it can be efficiently exploited in an optimization loop. In particular, the paper focuses on the topology optimization of structural components embedded in multibody systems. Generally, topology optimization techniques consider that the structural component is isolated from the rest of the mechanism and use simplified quasi-static load cases to mimic the complex loadings in service. In contrast, we show that an optimization directly based on the dynamic response of the flexible multibody system leads to a more integrated approach. The method is applied to truss structural components. Each truss is represented by a separate structural universe of beams with a topology design variable attached to each one. A SIMP model (or a variant of the power law) is used to penalize intermediate densities. The optimization formulation is stated as the minimization of the mean compliance over a time period or as the minimization of the mean tip deflection during a given trajectory, subject to a volume constraint. In order to illustrate the benefits of the integrated design approach, the case of a two degrees-of-freedom robot arm is developed. [less ▲]

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See detailControl of hydrogen photoproduction by the proton gradient generated by cyclic electron flow in Chlamydomonas reinhardtii.
Tolleter, Dimitri; Ghysels, Bart ULg; Alric, Jean et al

in Plant Cell (2011), 23(7), 2619-30

Hydrogen photoproduction by eukaryotic microalgae results from a connection between the photosynthetic electron transport chain and a plastidial hydrogenase. Algal H(2) production is a transitory ... [more ▼]

Hydrogen photoproduction by eukaryotic microalgae results from a connection between the photosynthetic electron transport chain and a plastidial hydrogenase. Algal H(2) production is a transitory phenomenon under most natural conditions, often viewed as a safety valve protecting the photosynthetic electron transport chain from overreduction. From the colony screening of an insertion mutant library of the unicellular green alga Chlamydomonas reinhardtii based on the analysis of dark-light chlorophyll fluorescence transients, we isolated a mutant impaired in cyclic electron flow around photosystem I (CEF) due to a defect in the Proton Gradient Regulation Like1 (PGRL1) protein. Under aerobiosis, nonphotochemical quenching of fluorescence (NPQ) is strongly decreased in pgrl1. Under anaerobiosis, H(2) photoproduction is strongly enhanced in the pgrl1 mutant, both during short-term and long-term measurements (in conditions of sulfur deprivation). Based on the light dependence of NPQ and hydrogen production, as well as on the enhanced hydrogen production observed in the wild-type strain in the presence of the uncoupling agent carbonyl cyanide p-trifluoromethoxyphenylhydrazone, we conclude that the proton gradient generated by CEF provokes a strong inhibition of electron supply to the hydrogenase in the wild-type strain, which is released in the pgrl1 mutant. Regulation of the trans-thylakoidal proton gradient by monitoring pgrl1 expression opens new perspectives toward reprogramming the cellular metabolism of microalgae for enhanced H(2) production. [less ▲]

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See detailAnisotropic damage model with initial stresses for microcracked materials
Levasseur, Séverine ULg; Collin, Frédéric ULg; Charlier, Robert ULg et al

in Fifth International Conference on Advanced COmputational Methods in ENgineering (ACOMEN 2011) (2011)

In a recent study (Levasseur et al., 2010), we proposed a class of isotropic damage models which account for initial stresses. The present paper extends this approach to anisotropic damage due to growth ... [more ▼]

In a recent study (Levasseur et al., 2010), we proposed a class of isotropic damage models which account for initial stresses. The present paper extends this approach to anisotropic damage due to growth of an arbitrarily penny-shaped microcracks system. The basic principle of the upscaling technique in the presence of initial stress is first recalled. Then, we derive a closed-form expression of the elastic energy potential corresponding to a system of arbitrarily oriented microcracks. Thanks to the investigation of the influence of initial stresses on the material response under non monotonous loading paths, it is shown how the coupling between initial stresses and damage is strongly dependent of the microcracks density and orientation. In case of a particular distribution of microcracks orientation, described by a second order damage tensor, this model corresponds to a generalization of the macroscopic damage model of Halm and Dragon (1996), for which a physically-based interpretation can be proposed. [less ▲]

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See detailValdeblore (06) Le Clouté
Pagès, Gaspard ULg

in D.R.A.C., S.R.A. (Ed.) Bilan scientifique de la région Provence-Alpes-Côte d’Azur 2010 (2011)

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See detailOrganisation du territoire de la cité antique de Narbonne : contraintes environnementales et exploitations des ressources
Cavero, Caroline; Sanchez, Corinne; Jézégou, Marie-Pierre et al

in Cavero, Caroline; Sanchez, Corinne; Jézégou, Maries-Pierre (Eds.) et al Fréjus romaine, la ville et son territoire : agglomérations de Narbonnaise, des Alpes-Maritimes et de Cisalpine à travers la recherche archéologique : actes du 8e Colloque historique de Fréjus, 8-10 octobre 2010 (2011)

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See detailSupraorbital transcutaneous neurostimulation has sedative effects in healthy subjects.
Piquet, Maxime; Balestra, Costantino; SAVA, Simona Liliana ULg et al

in BMC Neurology (2011), 11

BACKGROUND: Transcutaneous neurostimulation (TNS) at extracephalic sites is a well known treatment of pain. Thanks to recent technical progress, the Cefaly(R) device now also allows supraorbital TNS ... [more ▼]

BACKGROUND: Transcutaneous neurostimulation (TNS) at extracephalic sites is a well known treatment of pain. Thanks to recent technical progress, the Cefaly(R) device now also allows supraorbital TNS. During observational clinical studies, several patients reported decreased vigilance or even sleepiness during a session of supraorbital TNS. We decided therefore to explore in more detail the potential sedative effect of supraorbital TNS, using standardized psychophysical tests in healthy volunteers. METHODS: We performed a double-blind cross-over sham-controlled study on 30 healthy subjects. They underwent a series of 4 vigilance tests (Psychomotor Vigilance Task, Critical Flicker Fusion Frequency, Fatigue Visual Numeric Scale, d2 test). Each subject was tested under 4 different experimental conditions: without the neurostimulation device, with sham supraorbital TNS, with low frequency supraorbital TNS and with high frequency supraorbital TNS. RESULTS: As judged by the results of three tests (Psychomotor Vigilance Task, Critical Flicker Fusion Frequency, Fatigue Visual Numeric Scale) there was a statistically significant (p < 0.001) decrease in vigilance and attention during high frequency TNS, while there were no changes during the other experimental conditions. Similarly, performance on the d2 test was impaired during high frequency TNS, but this change was not statistically significant. CONCLUSION: Supraorbital high frequency TNS applied with the Cefaly(R) device decreases vigilance in healthy volunteers. Additional studies are needed to determine the duration of this effect, the underlying mechanisms and the possible relation with the stimulation parameters. Meanwhile, this effect opens interesting perspectives for the treatment of hyperarousal states and, possibly, insomnia. [less ▲]

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See detailLes traitements pharmacologiques chez les patients récupérant du coma
Gosseries, Olivia ULg; Thonnard, Marie ULg; Laureys, Steven ULg

in C Schnakers & S Laureys (Ed.) Comas et états de conscience altérée (2011)

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See detailConstraining statistical-model parameters using fusion and spallation reactions
Mancusi, D.; Charity, R. J.; Cugnon, Joseph ULg

in European Physics Journal: Web of conferences (2011)

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See detailLa clause dite de la "mortuaire" plus vivante que jamais
Leleu, Yves-Henri ULg; Geelhand de Merxem, Nicolas

in Journal des Tribunaux (2011), (6423), 93-95

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See detailContinuous-flow production of alkyl nitrites
Monbaliu, Jean-Christophe ULg; Jorda, Jeremy; Chevalier, Bérengère et al

in Chimica Oggi = Chemistry Today (2011), 29

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See detailAging is associated with more intrusions errors but not more plagiarism errors
Perfect, Timothy James; Defeldre, Anne-Catherine; Elliman, Rachel et al

Conference (2011)

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See detailVandalism Prevention of a Footbridge with Cable Vibrations
Canor, Thomas ULg; Kerschen, Gaëtan ULg; Denoël, Vincent ULg

in Biliszczuk, Jan; Bien, Jan; Hawryszkow, Pawel (Eds.) et al 4th International Conference Footbridge : Attractive structures at reasonable costs, Wroclaw 6-8 July 2011 (2011)

This work studies an unusual way to improve comfort of a footbridge with cables. Cables can be seen as a means of dissipating energy in a structure. This complementary source of dissipation does not ... [more ▼]

This work studies an unusual way to improve comfort of a footbridge with cables. Cables can be seen as a means of dissipating energy in a structure. This complementary source of dissipation does not prohibit resonance from taking place, but it is a way to limit vibrations and to impede vandals’ actions. This study is illustrated with measurements realized on a specific footbridge. This structure is a metallic arch characterized by a first natural frequency of 3.2Hz and a corresponding damping ratio of 0.55%. Intolerable accelerations (around 6m/s²) are easily reached when an ill-intentioned person is bouncing at an appropriate frequency. After installation of a single cable at a suitable location in the structure, the measured damping ratios are almost doubled and the maximum accelerations at resonance are reduced by 30%. With three cables on the footbridge, the damping ratio becomes significantly nonlinear: it reaches up to 3% for low amplitude oscillations, but drops down to 1% for moderate to high amplitudes. For higher accelerations, it does not seem to depend on the number of cables. According to these observations, a notable effect of cables is to reduce the maximum acceleration, but the main effect is to prolong the transient phase and to make the resonance frequency hardly identifiable by vandals. [less ▲]

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