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See detailTopology Optimization of Structural Components: A Multibody Dynamics-Oriented Approach
Bruls, Olivier ULg; Lemaire, Etienne ULg; Duysinx, Pierre ULg et al

in Proceedings of the Multibody Dynamics ECCOMAS Conference (2009)

This work addresses the topology optimization of structural components embedded in multibody systems with large amplitude motions. Generally, topology optimization techniques consider that the structural ... [more ▼]

This work addresses the topology optimization of structural components embedded in multibody systems with large amplitude motions. 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, this paper proposes an optimization procedure based on the dynamic simulation of the full multibody system with large amplitude motions and elastic deflections. We show that the simulation model, which involves a nonlinear finite element formulation, a time integration scheme and a sensitivity analysis, can be efficiently exploited in an optimization loop. 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 detailCarte hydrogéologique de Wallonie 1/25000 71/5-6 Lamorteau-Ruette.
Bouezmarni, Mohamed ULg; Denne, Pierre; Debbaut, Vincent ULg

Cartographic material (2009)

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See detailProviding sustainable long term care: a looming challenge
Cremer, Helmuth; De Donder, Philippe; Pestieau, Pierre ULg

in Toulouse School of Economics (2009), (3),

Long-term care (LTC hereafter) concerns people who depend on help to carry out daily activities. It is mainly delivered informally by families and to a lesser extent formally by professional care ... [more ▼]

Long-term care (LTC hereafter) concerns people who depend on help to carry out daily activities. It is mainly delivered informally by families and to a lesser extent formally by professional care assistants and nursing homes. Most EU governments are also involved in some way in the provision or financing of LTC services. Right now, the future of LTC provision appears to be gloomy, for demographic, societal and financial reasons. This TSE Note studies the strengths and weaknesses of three institutions providing LTC services - namely the family, the State and the private insurance market - and provides policy recommendations based on the view that governments should take the leadership towards a comprehensive approach of the dependency problem, while relying as much as possible on the family and the market. [less ▲]

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See detailEvaluation de la qualité de vie de personnes âgées : état actuel et utilisation de l’Inventaire Systémique de Qualité de Vie (ISQV©)
Missotten, Pierre ULg; Etienne, Anne-Marie ULg; Squelard, Gilles ULg et al

in Revue Francophone de Clinique Comportementale et Cognitive (2009), 14(3), 14-21

This study approaches the question of the evolution of the quality of life (QOL) measures in older patient populations. On base of the report of the weak number of instruments specifically adapted to this ... [more ▼]

This study approaches the question of the evolution of the quality of life (QOL) measures in older patient populations. On base of the report of the weak number of instruments specifically adapted to this population and of the absence of instruments taking into account both the expectations and the priorities of the individuals, we wished to make the adaptation of a tool for adult, the Quality of life Systematic Inventory (QLSI©). In this prospect, the main aim of this preliminary research was to test the evaluative approach of the QLSI© within a population of old people and to obtain useful information for the construction of a version of the QLSI© for old people. 135 voluntary subjects, from 65 to 85 years old, living at home and having a good health participated in the study. The questionnaire revealed a good QOL which could be explained by the combination of diverse factors such as a good current situation, a lesser importance given to the diverse life domains and the relatively weak goals. The results demonstrated the relevance of the QLSI© but also showed the necessity of certain modifications to make this questionnaire more specific to the old person. [less ▲]

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See detailRegistrum omnium librorum medicinalium... La bibliothèque de Nicolas Valckenisse († ca 1480), docteur en médecine de Louvain
Adam, Renaud ULg; Van Hoorebeeck, Céline

in Vons, Jacqueline (Ed.) Pratique et pensée médicales à la Renaissance. Actes du 51e Colloque international d’études humanistes (Tours, 2-6 juillet 2007) (2009)

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See detailLa neuropathie autonome: une complication méconnue du diabète
Philips, Jean-Christophe ULg; Marchand, Monique; Scheen, André ULg

in Association belge du diabète (2009), 52(1), 24-29

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See detailSocial enviroment influences aphid production of alarm pheromone
Verheggen, François ULg; Haubruge, Eric ULg; De Moraes, Consuelo M et al

in Behavioral Ecology (2009), 20(2), 283-288

In most aphid species, the volatile sesquiterpene (E)-beta-farnesene (E beta f) is released as an alarm pheromone in response to predation and is also emitted continuously at low levels. Some aphid ... [more ▼]

In most aphid species, the volatile sesquiterpene (E)-beta-farnesene (E beta f) is released as an alarm pheromone in response to predation and is also emitted continuously at low levels. Some aphid predators use E beta f as a foraging cue, suggesting that the benefits to aphids of signaling via E beta f must be weighed against the cost of increasing apparency to natural enemies. To determine whether aphids vary E beta f production in response to features of their social environment, we compared the production of E beta f by Acyrthosiphon pisum (Harris) individuals reared in isolation with that of individuals reared among conspecifics or individuals of a different aphid species, Myzus persicae. Production of E beta f by A. pisum reared in isolation was significantly lower than that of aphids reared among conspecifics or among M. persicae individuals. When we reared A. pisum individuals in isolation but exposed them to odors from an aphid colony, E beta f production was similar to that of aphids reared among conspecifics, suggesting that aphids use a volatile cue to assess their social environment and regulate their production of alarm pheromone. It is likely that this cue is E beta f itself, the only volatile compound previously found in headspace collections of A. pisum colonies. Finally, we examined the attraction of a predatory hoverfly, which uses E beta f as a foraging cue, to groups of aphids reared in isolation or among conspecifics and found that groups comprising individuals reared in isolation were significantly less attractive to the predator, suggesting that the observed variation in E beta f production may be ecologically relevant. [less ▲]

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See detailFonctions et localisation préférentielle des travaux de forge dans les campagnes du Haut-Empire de Narbonnaise : pour une approche paléométallurgique des faits archéologiques
Pagès, Gaspard ULg

in Leveau, Philippe; Raynaud, Claude; Sablayrolles, Robert (Eds.) et al Les formes de l’habitat rural gallo-romain : Terminologies et typologies à l’épreuve des réalités archéologiques, Actes du colloque AGER VIII (2009)

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See detailHVDC control strategies to improve transient stability in interconnected power systems
Hazra, Jagabondhu; Phulpin, Yannick; Ernst, Damien ULg

in Proceedings of the 2009 IEEE Bucharest PowerTech (2009)

This paper presents three HVDC modulation strategies to improve transient stability in an interconnected power system. AC variables such as rotor speeds, voltage phasors, and tieline power flows are used ... [more ▼]

This paper presents three HVDC modulation strategies to improve transient stability in an interconnected power system. AC variables such as rotor speeds, voltage phasors, and tieline power flows are used as input to the controller that modifies the power flow settings through the HVDC-links. The proposed techniques are tested on the IEEE 24-Bus reliability test system and critical clearing times obtained for several contingencies are analyzed. The paper shows that HVDC modulation can lead to substantial improvement in transient stability. [less ▲]

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See detailL'algorithme du simplexe
Bair, Jacques ULg; Henry, Valérie ULg

in Cohen, Gilles (Ed.) Les algorithmes (2009)

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See detailLes défauts d'implantation placentaire et leurs conséquences sur la fonction endothéliale maternelle
Foidart, Jean-Michel ULg; Noël, Agnès ULg; Chantraine, Frédéric ULg et al

in Bulletin Académique National de Médecine (2009), 193(5), 1059-66

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See detailEffects of high and low inspired fractions of oxygen on horse erythrocyte membrane properties, blood viscosity and muscle oxygenation during anaesthesia
Portier, Karine; Crouzier, David; Guichardant, Michel et al

in Veterinary Anaesthesia & Analgesia (2009), 36(4), 287-298

To evaluate whether a period of hyperoxia or after a period of hypoxia produced changes attributable to reactive oxygen species in anaesthetized horses. Prospective randomized experimental study. Six ... [more ▼]

To evaluate whether a period of hyperoxia or after a period of hypoxia produced changes attributable to reactive oxygen species in anaesthetized horses. Prospective randomized experimental study. Six healthy (ASA I) geldings, aged 4.5-9.5 years and weighing 510-640 kg(-1). After 30 minutes breathing air as carrier gas for isoflurane, horses were assigned randomly to breathe air as carrier gas (CG0.21) or oxygen as carrier gas (CG1.00) for a further 90 minutes. After an interval of 1 month each horse was re-anaesthetized with the other carrier gas for the 90 minute test period. Ventilation was controlled throughout anaesthesia. Arterial blood was sampled to measure gas tensions, lactate, cholesterol, vitamin E, 4-hydroxy-alkenals, 8-epi-PGF(2 alpha), half haemolysis time, half erythrolysis time, and erythrocyte membrane fluidity. Muscle blood flow and oxygenation were evaluated by near infrared spectroscopy and coloured Doppler. After the first 30 minutes horses were hypoxemic. Subsequently the CG1.00 group became hyperoxaemic (PaO2 similar to 240 mmHg) whereas the CG0.21 group remained hypoxaemic (PaO2 similar to 60 mmHg) and had increased lactate concentration. No significant changes in vitamin E, 4-hydroxy-alkenals, or 8-epi-PGF(2 alpha) concentrations were detected. During the 90 minute test period the CG0.21 group had increased resistance to free-radical-mediated lysis in erythrocytes, whereas the CG1.00 group had slightly decreased resistance of whole blood to haemolysis. CG0.21 induced a progressive muscle deoxygenation whereas CG1.00 induced an increase in muscle oxygen saturation followed by progressive deoxygenation towards baseline. During isoflurane anaesthesia in horses, the hyperoxia induced by changing from air to oxygen induced minimal damage from reactive oxygen species. Using air as the carrier gas decreased skeletal muscle oxygenation compared with using oxygen [less ▲]

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See detailInfluence of the chemical composition on the thixoformability of steels
Pierret, Jean-Christophe ULg; Rassili, Ahmed ULg; Vaneetveld, Grégory ULg et al

in International Journal of Material Forming (2009)

This work deals with the qualification of a variety of steels for their shaping by the thixoforging process. This technology requires setting up a globular microstructure inside the material during ... [more ▼]

This work deals with the qualification of a variety of steels for their shaping by the thixoforging process. This technology requires setting up a globular microstructure inside the material during reheating to a temperature between the solidus and liquidus. As the evolution of the liquid fraction is strongly connected to the steel composition, it is useful to understand how low carbon steel could be alloyed and still thixoformable. The most critical parameter for this is the carbon content. In this study, a theoretical analysis of the phase evolution during the reheating has been performed on the MT Data software to investigate the influence of alloying elements. These first results have been confirmed by Differential Thermal Analysis and by inductive heating experiments on steel slugs. Finally, some parts have been shaped using a thixoforming tool mounted on a hydraulic press. Micrographs of reheated slugs as well as of actual parts are also presented in this paper. [less ▲]

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See detailPolitiques de la souffrance, politiques du vivant : quand les corps « parlent » de la souffrance
Vrancken, Didier ULg

in Perilleux, Thomas; Cultiaux, John (Eds.) Destins politiques de la souffrance. Intervention sociale, justice, travail (2009)

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