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See detailInvestigating the performance of model order reduction techniques for nonlinear radiative heat transfer problems
Hickey, D.; Masset, Luc ULg; Kerschen, Gaëtan ULg et al

in Proceedings of the International Conference on Advanced Computational Methods in Engineering (2011)

The problem of nonlinear radiative heat transfer is one of great importance to the aerospace industry. However, analysing large-scale, nonlinear, multiphysical, dynamical structures, by using mathematical ... [more ▼]

The problem of nonlinear radiative heat transfer is one of great importance to the aerospace industry. However, analysing large-scale, nonlinear, multiphysical, dynamical structures, by using mathematical modelling and simulation, e.g. Finite Element Modelling (FEM), can be computationally expensive. This provides motivation for the development of Model-Order Reduction (MOR) techniques capable of reducing simulation times without the loss of important information. The objective is to demonstrate the method of Proper Orthogonal Decompostition (POD) as a technique for nonlinear MOR. The nonlinear radiative exchanges between a linear benchmark beam within an external box (Figure 1) are analysed and a reduction procedure for this fully coupled, nonlinear, multiphysical, thermomechanical system is established. The solution to the strongly coupled, thermomechanical equations of motion is found by making use of an extended version of the implicit generalized-alpha scheme. In the reduced model, the residual of the unreduced system of equations need to be evaluated at each Newton iteration of each time step. In order to optimise the efficiency of the reduction method it is shown that the internal forces can be split into their linear and nonlinear counterparts. Only the nonlinear terms change at each time step, thus only these terms need to remain in the iterative loop significantly reducing the number of parameters that are to be computed at each step. These efficiency improvements to the method are discussed and the results are given. [less ▲]

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See detailLa famille transnationale dans tous ses états
Razy, Elodie ULg; Baby-Collin, Virginie

in Autrepart : Revue de Sciences Sociales au Sud (2011), 57-58

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See detailIndustrial applications of extended output-only Blind Source Separation techniques
Rutten, Christophe ULg; Nguyen, Viet Ha; Golinval, Jean-Claude ULg

in Vibration Problems Icovp 2011: The 10th International Conference on Vibration Problems (2011)

In the field of structural health monitoring or machine condition moni-toring, most vibration based methods reported in the literature require to measure responses at several locations on the structure ... [more ▼]

In the field of structural health monitoring or machine condition moni-toring, most vibration based methods reported in the literature require to measure responses at several locations on the structure. In machine condition monitoring, the number of available vibration sensors is often small and it is not unusual that only one single sensor is used to monitor a machine. This paper presents industrial applications of two possible extensions of output-only Blind Source Separation (BSS) techniques, namely Principal Component Analysis (PCA) and Second Order Blind Identification (SOBI). Through the use of block Hankel matrices, these methods may be used when a reduced set of sensors or even one single sensor is available. The objective is to address the problem of fault detection in mechanical systems using subspace-based methods. The detection is achieved by comparing the subspace features between the reference and a current state using the concept of angular coherence between subspaces. [less ▲]

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See detailTVA et droits d'enregistrement sur les ventes de terrains depuis le 1er janvier 2011. La mise en pratique du nouveau régime
Douny, Raphaël ULg; Pace, Xavier ULg

in En quête de fiscalité et autres propos… Mélanges offerts à Jean-Pierre BOURS (2011)

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See detailFeedback control strategies for spatial navigation revealed by dynamic modelling of learning in the Morris water maze
Fey, Dirk ULg; Commins, Sean; Bullinger, Eric ULg

in Journal of Computational Neuroscience (2011), 30(2), 447-454

The Morris water maze is an experimental procedure in which animals learn to escape swimming in a pool using environmental cues. Despite its success in neuroscience and psychology for studying spatial ... [more ▼]

The Morris water maze is an experimental procedure in which animals learn to escape swimming in a pool using environmental cues. Despite its success in neuroscience and psychology for studying spatial learning and memory, the exact mnemonic and navigational demands of the task are not well understood. Here, we provide a mathematical model of rat swimming dynamics on a behavioural level. The model consists of a random walk, a heading change and a feedback control component in which learning is reflected in parameter changes of the feedback mechanism. The simplicity of the model renders it accessible and useful for analysis of experiments in which swimming paths are recorded. Here, we used the model to analyse an experiment in which rats were trained to find the platform with either three or one extramaze cue. Results indicate that the 3-cues group employs stronger feedback relying only on the actual visual input, whereas the 1-cue group employs weaker feedback relying to some extent on memory. Because the model parameters are linked to neurological processes, identifying different parameter values suggests the activation of different neuronal pathways. [less ▲]

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See detailTranscranial magnetic stimulation-evoked EEG/cortical potentials in physiological and pathological aging.
Casarotto, Silvia; Maatta, Sara; Herukka, Sanna-Kaisa et al

in Neuroreport (2011), 22(12), 592-7

The frontal cortex undergoes macrostructural and microstructural changes across the lifespan. These changes can be entirely physiological, such as the ones occurring in elderly individuals who are ... [more ▼]

The frontal cortex undergoes macrostructural and microstructural changes across the lifespan. These changes can be entirely physiological, such as the ones occurring in elderly individuals who are cognitively intact, or pathological, such as the ones occurring in patients with Alzheimer's disease. Here, we use simultaneous electroencephalography (EEG) and transcranial magnetic stimulation (TMS) to study how the excitability of the frontal cortex changes during healthy and pathological aging. Hence, we compared the TMS-evoked EEG potentials collected in healthy elderly individuals with the ones collected in healthy young individuals, and in patients with Alzheimer's disease. We have shown that the EEG response to TMS of the left superior frontal cortex is not affected by physiological aging but is markedly altered by cognitive impairment. [less ▲]

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See detailThe adaptive efficiency of land use planning
Halleux, Jean-Marie ULg; Marcinczak, S.; van der Krabben, E.

in Pinto, N. N.; Tenedorio, J. A.; Santos, M. (Eds.) et al Proceedings of the 7th International Conference on Virtual Cities and Territories (2011)

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See detailLa revue Anthologie et l'architecture de l'avant-garde
Charlier, Sébastien ULg

Article for general public (2011)

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See detailNew substituted aryl esters and aryl amides of 3,4-dihydro-2H-1,2,4- benzothiadiazine 1,1-dioxides as positive allosteric modulators of AMPA receptors
Dintilhac, Gaëlle ULg; Arslan, Deniz ULg; Dilly, Sébastien ULg et al

in MedChemComm (2011), 2

AMPA receptor potentiators belonging to 3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxides have been found to be of great interest as cognitive enhancers. Previous structure–activity relationships have ... [more ▼]

AMPA receptor potentiators belonging to 3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxides have been found to be of great interest as cognitive enhancers. Previous structure–activity relationships have demonstrated the importance for activity of the nature of the substituent at the 7-position of the heterocycle. This work aims to explore the impact on AMPA potentiation of the introduction of different aryl and aralkyl ester or aryl amide groups at the 7-position. The new synthesized compounds were evaluated as AMPA receptor potentiators by examining their effect on rat brain primary cell cultures on AMPA-evoked membrane depolarisation using fluorescent membrane potential dyes and on imaging-based plate reader. The most potent compound of this series was 2-methylphenyl 4-methyl- 3,4-dihydro-2H-1,2,4-benzothiadiazine-7-carboxylate 1,1-dioxide 16c which provoked a strong potentiation of AMPA current with a potency close to that reported for the best reference compounds of the benzothiadiazine class (i.e cyclothiazide). This work also revealed that only the ortho-substitution of the phenyl group of 1,2,4-benzothiadiazine-7-carboxylate esters provided potent AMPA receptor potentiators opening the way to further chemical exploration. [less ▲]

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See detailTrouver le quatre. Espace, peinture et images de la scène dans Devant la parole
Dubouclez, Olivier ULg

in Ferry, Marion (Ed.) L’Acte inconnu/Devant la parole (2011)

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See detailResting-state fMRI activity in tinnitus
Maudoux, Audrey ULg

Poster (2011)

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See detailBouncing bubble on a liquid/gas interface resting or vibrating
Zawala, jan; Dorbolo, Stéphane ULg; Terwagne, Denis ULg et al

in Soft Matter (2011)

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See detailRecensement des Silphidae dans les collections d'étudiants de Gembloux Agro-Bio Tech sur la période 2001-2010
Dekeirsschieter, Jessica ULg; Verheggen, François ULg; Bonnet, Stéphanie ULg et al

in Faunistic Entomology - Entomologie Faunistique (2011), 64(1), 15-21

Les Silphidae capturés par les étudiants de Gembloux Agro-Bio Tech (Université de Liège) durant la période 2001-2010 se répartissent entre treize espèces de Silphinae et de Nicrophorinae. Cinq espèces de ... [more ▼]

Les Silphidae capturés par les étudiants de Gembloux Agro-Bio Tech (Université de Liège) durant la période 2001-2010 se répartissent entre treize espèces de Silphinae et de Nicrophorinae. Cinq espèces de Nicrophorinae ont été recensées: Nicrophorus vespillo L. 1758, Nicrophorus vespilloides Herbst 1783, Nicrophorus interruptus Stephens 1830, Nicrophorus investigator Zetterstedt 1824, et Nicrophorus humator Gleditsch 1767. Concernant les Silphinae, on a recensé huit espèces: Oiceoptoma thoracicum L. 1758, Dendroxena quadrimaculata Scopoli 1772, Necrodes littoralis L. 1758, Ablattaria laevigata laevigata F. 1775, Thanatophilus sinuatus F. 1775, Silpha carinata Herbst 1783, Silpha tristis Illiger 1798 et Phosphuga atrata atrata L. 1758. L’espèce de Silphinae la plus représentée parmi les collections d’étudiants est P. atrata atrata suivie d’O. thoracicum. Parmi les Nicrophorus spp., N. vespilloides, N. humator et N. vespillo sont les espèces plus représentées. [less ▲]

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See detailLos editores españoles y la traducción en la Argentina: desembarco en tierras fértiles
Willson, Patricia ULg

in Pagni, Andrea (Ed.) El exilio republicano español en México y Argentina. Historia cultural, instituciones literarias, medios (2011)

Since 1938, the year in which Losada publishing house was founded in Buenos Aires, publishers of Spanish origin contributed to a diversified and autonomous cultural field where translation played already ... [more ▼]

Since 1938, the year in which Losada publishing house was founded in Buenos Aires, publishers of Spanish origin contributed to a diversified and autonomous cultural field where translation played already a major role. This chapter examines the practices and agents of literary import, the different figures of translator, and the question of so-called «national tongue». [less ▲]

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See detailSmooth semiparametric and nonparametric Bayesian estimation of bivariate densities from bivariate histogram data
Lambert, Philippe ULg

in Computational Statistics & Data Analysis (2011), 55

Penalized B-splines combined with the composite link model are used to estimate a bivariate density from a histogram with wide bins. The goals are multiple: they include the visualization of the ... [more ▼]

Penalized B-splines combined with the composite link model are used to estimate a bivariate density from a histogram with wide bins. The goals are multiple: they include the visualization of the dependence between the two variates, but also the estimation of derived quantities like Kendall’s tau, conditional moments and quantiles. Two strategies are proposed: the first one is semiparametric with flexible margins modeled using B-splines and a parametric copula for the dependence structure; the second one is nonparametric and is based on Kronecker products of the marginal B-spline bases. Frequentist and Bayesian estimations are described. A large simulation study quantifies the performances of the two methods under different dependence structures and for varying strengths of dependence, sample sizes and amounts of grouping. It suggests that Schwarz’s BIC is a good tool for classifying the competing models. The density estimates are used to evaluate conditional quantiles in two applications in social and in medical sciences. [less ▲]

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See detailIdentification d'une dermatose provoquée par la lumière
PIERARD-FRANCHIMONT, Claudine ULg; CAUCANAS, Marie ULg; QUATRESOOZ, Pascale ULg et al

in Revue Médicale de Liège (2011), 66

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See detailLes débats relatifs à la clôture des moniales aux XVIIe et XVIIIe siècles : discours croisés entre deux mondes
Henneau, Marie-Elisabeth ULg

in Heulant-Donat, Isabelle; Claustre, JUlie; Lusset, Elisabeth (Eds.) Enfermements. Le cloître et la prison VIe - XVIIIe s. (2011)

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See detailComprendre les femmes au foyer, des intermittentes du travail ? « Comprendre les femmes au foyer, des intermittentes du travail ? »
Dieu, Anne Marie; Cornet, Annie ULg; Delhaye, Christine

in Revue Internationale de Psychosociologie (2011), XVII(43), 261-281

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