Publications ORBi OA
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See detailLe comportement suicidaire chez l'enfant
Malchair, Alain ULg

in Revue Médicale de Liège (2010), 65(2), 67-70

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See detailAxion-like particles and circular polarisation of active galactic nuclei
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

in Jaeckel, Joerg; Lindner, Axel; Redondo, Javier (Eds.) Proceedings of the 5th Patras Workshop on Axions, WIMPs and WISPs PATRAS 2009 (2010)

The measurements of the linear polarisation of visible light from quasars give strong evidence for large-scale coherent orientations of their polarisation vectors in some regions of the sky. We show that ... [more ▼]

The measurements of the linear polarisation of visible light from quasars give strong evidence for large-scale coherent orientations of their polarisation vectors in some regions of the sky. We show that these observations can be explained by the mixing of the photons with very light pseudoscalar (axion-like) particles in extragalactic magnetic fields during their propagation. We present a new treatment in terms of wave packets and discuss the circular polarisation. [less ▲]

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See detailOn the circular polarisation of light from axion-photon mixing
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

in Alimi, Jean-Michel; Füzfa, André (Eds.) INVISIBLE UNIVERSE: Proceedings of the Conference. AIP Conference Proceedings 1241. (2010)

From the analysis of measurements of the linear polarisation of visible light coming from quasars, the existence of large-scale coherent orientations of quasar polarisation vectors in some regions of the ... [more ▼]

From the analysis of measurements of the linear polarisation of visible light coming from quasars, the existence of large-scale coherent orientations of quasar polarisation vectors in some regions of the sky has been reported. Here, we show that this can be explained by the mixing of the incoming photons with nearly massless pseudoscalar (axion-like) particles in extragalactic magnetic fields. We present a new treatment in terms of wave packets and discuss its implications for the circular polarisation. [less ▲]

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See detailThe Total Cross Section at the LHC: Models and Experimental Consequences
Cudell, Jean-René ULg

(2010)

I review the predictions of the total cross section for many models, and point out that some of them lead to the conclusion that the standard experimental analysis may lead to systematic errors much ... [more ▼]

I review the predictions of the total cross section for many models, and point out that some of them lead to the conclusion that the standard experimental analysis may lead to systematic errors much larger than expected. [less ▲]

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See detailEffect of various Neurally adjusted ventilatory assist (NAVA) gains on the relationship between diaphragmatic activity (Eadi max) and tidal volume
Chiew, YS; Piquilloud, L.; Desaive, Thomas ULg et al

in Intensive Care Medicine (2010), 37 (Suppl 1)

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See detailThe critical role of carbohydrate administration in safe, effective TGC
PREISER, Jean-Charles ULg; Suhaimi, F; Chase, JG et al

in Clinical Nutrition (2010), 5 (Suppl 2):111

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See detailPatient-specific modelling of cardiovascular dysfunction: Identifying models of pulmonary embolism in pigs
Desaive, Thomas ULg; Revie, J; Hann, CE et al

in Proceedings of the 19th International Conference of the Cardiovascular System Dynamics Society (2010)

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See detailModel-based cardiac disease diagnosis in critical care
Revie, JA; Hann, CE; Stevenson, D et al

in Proceedings of the Health Research Society of Canterbury (HRSC) Clinical Meeting 2010 (2010)

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See detailValidation of a virtual trial method for tight glycemic control in intensive care
Suhaimi, F; Chase, JG; PREISER, Jean-Charles ULg et al

in Proceedings of the Health Research Society of Canterbury (HRSC) Clinical Meeting 2010 (2010)

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See detailAbstract of the first IGCP – 580 meeting (Liège, Belgium, 2-6 December 2009)
Da Silva, Anne-Christine ULg; Boulvain, Frédéric ULg

Book published by Geologica Belgica (2010)

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See detailConception et réalisation du système de déploiement des antennes du nanosatellite OUFTI-1
Wertz, Jérôme ULg; Lenaerts, Vincent; Bruls, Olivier ULg et al

in Coudyser, A. (Ed.) Revue Scientifique des Instituts Supérieurs Industriels Libres Francophones, volume 24 (2010)

The OUFTI-1 satellite is a CubeSat (a standard cubic satellite of 10cm edge and 1 kg mass maximum) developed at University of Liège. The subject of the master thesis is the design and realization of its ... [more ▼]

The OUFTI-1 satellite is a CubeSat (a standard cubic satellite of 10cm edge and 1 kg mass maximum) developed at University of Liège. The subject of the master thesis is the design and realization of its antennas, and also of their deployment system. The thesis result is a prototype including all the system functions and which has been vacuum-tested. [less ▲]

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See detailExploiting policy knowledge in online least-squares policy iteration: An empirical study
Busoniu, Lucian; Ernst, Damien ULg; Babusku, Robert et al

in Automation, Computers, Applied Mathematics (2010), 19(4), 521-529

Reinforcement learning (RL) is a promising paradigm for learning optimal control. Traditional RL works for discrete variables only, so to deal with the continuous variables appearing in control problems ... [more ▼]

Reinforcement learning (RL) is a promising paradigm for learning optimal control. Traditional RL works for discrete variables only, so to deal with the continuous variables appearing in control problems, approximate representations of the solution are necessary. The field of approximate RL has tremendously expanded over the last decade, and a wide array of effective algorithms is now available. However, RL is generally envisioned as working without any prior knowledge about the system or the solution, whereas such knowledge is often available and can be exploited to great advantage. Therefore, in this paper we describe a method that exploits prior knowledge to accelerate online least-squares policy iteration (LSPI), a state-of-the-art algorithm for approximate RL. We focus on prior knowledge about the monotonicity of the control policy with respect to the system states. Such monotonic policies are appropriate for important classes of systems appearing in control applications, including for instance nearly linear systems and linear systems with monotonic input nonlinearities. In an empirical evaluation, online LSPI with prior knowledge is shown to learn much faster and more reliably than the original online LSPI. [less ▲]

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See detailLoading and skeletal development and maintenance.
Bergmann, P.; Body, J. J.; BOONEN, S. et al

in Journal of Osteoporosis (2010), 2011

Mechanical loading is a major regulator of bone mass and geometry. The osteocytes network is considered the main sensor of loads, through the shear stress generated by strain induced fluid flow in the ... [more ▼]

Mechanical loading is a major regulator of bone mass and geometry. The osteocytes network is considered the main sensor of loads, through the shear stress generated by strain induced fluid flow in the lacuno-canalicular system. Intracellular transduction implies several kinases and phosphorylation of the estrogen receptor. Several extra-cellular mediators, among which NO and prostaglandins are transducing the signal to the effector cells. Disuse results in osteocytes apoptosis and rapid imbalanced bone resorption, leading to severe osteoporosis. Exercising during growth increases peak bone mass, and could be beneficial with regards to osteoporosis later in life, but the gain could be lost if training is abandoned. Exercise programs in adults and seniors have barely significant effects on bone mass and geometry at least at short term. There are few data on a possible additive effect of exercise and drugs in osteoporosis treatment, but disuse could decrease drugs action. Exercise programs proposed for bone health are tedious and compliance is usually low. The most practical advice for patients is to walk a minimum of 30 to 60 minutes per day. Other exercises like swimming or cycling have less effect on bone, but could reduce fracture risk indirectly by maintaining muscle mass and force. [less ▲]

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See detailAn Empirical Analysis of Income convergence in the European Union
Cavenaile, Laurent ULg; Dubois, David ULg

E-print/Working paper (2010)

In this paper, we investigate the convergence process within the European Union (27 countries). More particularly, we study the convergence process of the new entrants from Central and Eastern Europe and ... [more ▼]

In this paper, we investigate the convergence process within the European Union (27 countries). More particularly, we study the convergence process of the new entrants from Central and Eastern Europe and of the 15 Western countries between 1990 and 2007. Applying a panel approach to the convergence equation derived by Mankiw et al. (1992) from the Solow model, we highlight the existence of heterogeneity in the European Union and show that new entrants and former members of the European Union can be seen as belonging to significantly differ- ent groups of convergence. The existence of heterogeneity in the European Union or the Eurozone might affect their stability as the recent Greece’s sovereign debt crisis illustrates it. [less ▲]

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See detailWeighing risk factors associated with bee Colony Collapse Disorder by classification and regression tree Analysis
vanEngelsdorp, D.; Speybroeck, N.; Evans, J. et al

in Journal of Economic Entomology (2010)

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See detailNotices sur trois romans recommandés pour l'été 2010
Durand, Pascal ULg

E-print/Working paper (2010)

Notices au sujet de trois romans recommandés pour les lecteurs du site Culture de l'Université de Liège : Jack London, Martin Eden (1909), Eric Chevillard, Démolir Nisard (2006) et Mme de La Fayette, La ... [more ▼]

Notices au sujet de trois romans recommandés pour les lecteurs du site Culture de l'Université de Liège : Jack London, Martin Eden (1909), Eric Chevillard, Démolir Nisard (2006) et Mme de La Fayette, La Princesse de Clèves (1678). [less ▲]

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See detailAssessment of bovine tuberculosis risk factors based on nationwide molecular epidemiology
Humblet, Marie-France ULg; Gilbert, M.; Govaerts, M. et al

in Journal of Clinical Microbiology (2010)

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See detailCassandre, un outil pour construire, confronter et expliciter les interprétations
Lejeune, Christophe ULg

in Beauvais, Martine; Clénet, Jean (Eds.) Actes du 2ème colloque international francophone sur les méthodes qualitatives (2010)

Cassandre est un logiciel libre d'analyse de textes, adossé à la plateforme collaborative Hypertopic. Fruit de la convergence épistémologique entre l'analyse qualitative (en sciences humaines) et le Web ... [more ▼]

Cassandre est un logiciel libre d'analyse de textes, adossé à la plateforme collaborative Hypertopic. Fruit de la convergence épistémologique entre l'analyse qualitative (en sciences humaines) et le Web socio-sémantique (en informatique), cet outil accompagne la construction semi-automatique du (des) cadre(s) d'analyse du (des) chercheur(s). Une série de comptes-rendus d'utilisation (tantôt collectifs tantôt isolés, plutôt inductifs ou hypothético-déductifs) attestent des apports de l'outil : génération d'un journal de bord, économie cognitive et temporelle, flexibilité, aide au travail en équipe et multiplication des entrées dans le matériau. Ces usages témoignent également des inévitables limites afférentes à l'usage d'un logiciel dans une approche qualitative. En définitive, on plaide donc pour un recours raisonné à Cassandre, comme à tout autre logiciel. [less ▲]

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See detailLes vers de terre, ingénieurs du sol
Zirbes, Lara ULg

Learning material (2010)

Detailed reference viewed: 57 (8 ULg)