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See detailSpeckle interferometry at 10 µm with CO2 lasers and microbolometers array
Georges, Marc ULg; Vandenrijt, Jean-François ULg; Thizy, Cédric ULg et al

in Kieffer, Jean-Claude (Ed.) Photonics North 2012 (2012, June 06)

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See detailVers une définition unique des zones périurbaines?: l'apport de l'écologie du paysage pour la segmentation du gradient urbain-rural
Andre, Marie ULg; Mahy, Grégory ULg; Lejeune, Philippe ULg et al

in Guinand, Sandra (Ed.) Journées APERAU 2012. Penser et Produire la Ville au XXIème Siècle. Modernisation écologique, qualité urbaine et justice spatiale. (2012, June 06)

L'avènement de l'agriculture, la sédentarisation de l'homme dans des villages, l'extension de ces derniers au point de devenir des villes de taille sans cesse croissante sont autant de phénomènes ... [more ▼]

L'avènement de l'agriculture, la sédentarisation de l'homme dans des villages, l'extension de ces derniers au point de devenir des villes de taille sans cesse croissante sont autant de phénomènes augmentant l'emprise de l'homme sur les ressources naturelles et participant à la dynamique paysagère (Mazoyer et Roudart, 1997). Le phénomène n'est pas négligeable: aujourd'hui, le nombre de personnes vivant dans ce qu'on désigne sous le terme de "ville" a dépassé celui des personnes vivant en dehors (United Nations, 2007). Il convient donc d'étudier en profondeur les conséquences de ce processus qu'est l'urbanisation et de les quantifier (Alberti, 2008). En particulier, la périurbanisation, caractérisée par une expansion diffuse de la ville dans un milieu mitoyen gardant son caractère rural, est au cœur des préoccupations de part sa position stratégique entre des espaces fortement et nettement moins anthropisés (Hervoët, 2001). Toute étude scientifique doit commencer par la délimitation du système étudié (Grimm et al., 2003). Paradoxalement, une synthèse bibliographique récente démontre qu'il n'existe pas de consensus sur le nombre de zones rencontrées dans ce gradient ni sur les définitions et caractéristiques de chacune de ces zones. L'article conclu qu'en vue d'une identification spatiale des zones à l'aide de la télédétection, il est préférable d'utiliser préférentiellement les caractéristiques morphologiques qu'il convient de traduire sous forme d'indices de structure spatiale permettant l'implémentation pratique des définitions données aux zones (André et al., en préparation). Suite à cette constatation, la présente contribution présente une méthode de segmentation du gradient urbain-rural qui s'appuie sur des éléments et indices paysagers décrivant la composition et la structure paysagères. Ces indices illustrent sous forme quantifiable les caractéristiques morphologiques les plus couramment citées pour décrire les différentes zones situées dans le gradient. [less ▲]

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See detailDevelopment of an interface between CFD and FE software
Tondini, Nicola; Vassart, Olivier; Franssen, Jean-Marc ULg

in Fontana, Mario; Frangi, Andrea; Knobloch, Markus (Eds.) Proceedings of the 7th International Conference on Structures in Fire (2012, June 06)

The paper presents the assumptions and the issues that arise when developing an integrated modelling methodology between a Computational Fluid Dynamics (CFD) software applied to compartment fires and a ... [more ▼]

The paper presents the assumptions and the issues that arise when developing an integrated modelling methodology between a Computational Fluid Dynamics (CFD) software applied to compartment fires and a Finite Element (FE) software applied to structural systems. In particular, a weak coupling approach used to simulate a fire exposed structure by modelling the fire development in the compartment, the heat penetration in the structure and the mechanical response is described. The advantages and the disadvantages of such a technique are highlighted compared to a full coupling that conversely takes into account all mutual interactions. The favourable aspect of computing the thermal response of the structure in the FE model in order to avoid modelling the structure in the CFD model is underlined, namely a sensitive reduction of computational demand. Finally, a practical application is presented. [less ▲]

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See detailVers une définition unique des zones périurbaines?
Andre, Marie ULg; Bogaert, Jan ULg; Mahy, Grégory ULg et al

in Guinand, Sandra (Ed.) Journées APERAU 2012. Penser et Produire la Ville au XXIème Siècle. Modernisation écologique, qualité urbaine et justice spatiale. (2012, June 06)

A l'heure où les villes ne cessent d'augmenter leur emprise sur les paysages mondiaux, l'étude des espaces qui les ceinturent, couramment appelés "zones périurbaines" et le phénomène de leur extension ... [more ▼]

A l'heure où les villes ne cessent d'augmenter leur emprise sur les paysages mondiaux, l'étude des espaces qui les ceinturent, couramment appelés "zones périurbaines" et le phénomène de leur extension dans les régions rurales sont plus que jamais des sujets d'actualité. Les conséquences et enjeux s'y jouant varient selon les régions du monde mais d'aucuns s'accordent à dire que le phénomène de périurbanisation mène en général à la formation de ghettos sociaux, au renforcement des inégalités sociales, à la dégradation visuelle des paysages, ainsi qu'à des conflits humains dus à la multiplication des acteurs y vivant ou y pratiquant une activité. Plus précisément, dans le domaine de l'écologie, ces zones peuvent être à l'origine d'invasions par des espèces exotiques, comme à l'origine de la perte, de la fragmentation ou du rétrécissement des milieux et paysages ouverts, des grandes étendues d'habitats non fragmentés, d'espaces destinés aux compensations écologiques ou même de lieux récréatifs. Ces derniers processus diminuent la qualité de la biodiversité à ces endroits. Paradoxalement, les notions de "rural", de "périurbain" et d'"urbain" restent assez floues; les scientifiques de différentes disciplines peinant à leur donner une définition et des limites acceptées par tous. Il n'est pas rare également certaines études mentionnent une de ces zones sans la définir, la signification exacte étant sous-entendue. Les problèmes causés par l'absence fréquente de définition des zones étudiées sont les suivants: • L'interprétation et la classification d'images satellites, de laquelle découle un grand nombre d'informations pour les planificateurs du territoire et les scientifiques, nécessite une définition claire de ce qui est considéré comme une zone urbaine, périurbaine ou rurale ainsi que des critères et seuils qui délimitent ces classes d'occupation du sol les unes des autres; • Il n'y a pas de comparaison possible entre études portant sur le même sujet car les localisations et natures des sites peuvent être différents; • Dans le domaine scientifique, il est difficile de déterminer si une précision faible dans un résultat obtenu dans une zone (péri)urbaine est dû à de mauvaises mesures qui peuvent être améliorées ou si c'est la définition de la zone qui pose problème. Dans cette étude, différents termes, définitions et caractéristiques se rapportant aux zones urbaines, périurbaines et rurales ont été examinés et comparés sur base de critères tels que leur type ainsi que leurs forces et faiblesses, dans une optique d'analyse de l'évolution d'un paysage. Les causes aux différences observées, la pertinence et les lacunes des différentes définitions et caractéristiques ont été discutées. Enfin, la contribution potentielle d'indices paysagers a été examinée. [less ▲]

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See detailFire analysis of a new steel bridge
Tonicello, Eric; Desanghere, Sylvain; Vassart, Olivier et al

in Fontana, Mario; Frangi, Andrea; Knobloch, Markus (Eds.) Proceedings of the 7th International Conference on Structures in Fire (2012, June 06)

The new steel bridge “Hans-Wilsdorf” in Geneva is an exceptional steel structure that will drive general traffic through a main transportation axis. As the investment cost of the project is important, a ... [more ▼]

The new steel bridge “Hans-Wilsdorf” in Geneva is an exceptional steel structure that will drive general traffic through a main transportation axis. As the investment cost of the project is important, a structural fire analysis has been performed to study the sensitivity of the structure to a high temperature exposure, such as a truck in fire on the deck. This analysis will allow deciding whether a severe fire could be an unacceptable economical risk for the bridge. [less ▲]

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See detailInvestigating the factors for fermentative biohydrogen improvement: original bioreactors design and hydrogen partial pressure effect
Beckers, Laurent ULg; Hiligsmann, Serge ULg; Hamilton, Christopher ULg et al

in WHEC 2012, Toronto June 3rd - 7th (2012, June 05)

The anaerobic production of hydrogen from biomass offers the potential production of usable biogas from a variety of renewable resources. However, in order to produce hydrogen at high yields and ... [more ▼]

The anaerobic production of hydrogen from biomass offers the potential production of usable biogas from a variety of renewable resources. However, in order to produce hydrogen at high yields and production rates the biotechnological process needs to be further optimized and efficient bioreactors must be designed [1]. At the CWBI, a continuous horizontal rotating cylinder bioreactor has been designed and investigated to produce biohydrogen from glucose by the strain Clostridium butyricum [2] at good yields (1,9molH2•molglucose-1) and production rates (48,6mmolH2•Lmilieu-1.molhexose-1•h-1). This reactor has an internal volume of 2.3L and a small working volume (300ml) (fig.1). It enhances the hydrogen production rates (by about three times more than a completely stirred bioreactor) by partially immobilizing the bacteria on the porous support. Moreover, the rotating cylinder design enables efficient H2 gas transfer from the liquid phase increasing hydrogen yields by about 25% compared to a completely stirred bioreactor [3-4]. Other original bioreactors, such as a trickle bed, have been built with the same aim of lowering the hydrogen partial pressure and led to similar results. Our work shows the importance of a good liquid to gas transfers in the biohydrogen-producing reactors to reach higher performances. [less ▲]

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See detailExperimental analysis of PKW hydraulic performance and geometric parameters optimum
Machiels, Olivier ULg; Erpicum, Sébastien ULg; Pirotton, Michel ULg et al

in Proceedings of International workshop on Piano Key Weir for In-stream Storage and Dam Safety - PKWISD-2012 (2012, June 01)

In the scope of dam rehabilitation to manage floods increase or to increase water storage, the Piano Key Weir is a good solution for concrete dams. The efficiency of Piano Key Weirs is now well ... [more ▼]

In the scope of dam rehabilitation to manage floods increase or to increase water storage, the Piano Key Weir is a good solution for concrete dams. The efficiency of Piano Key Weirs is now well demonstrated through various experimental studies. Even if parametrical studies are currently undertaken, the definition of the optimal shape to give to the structure is still missing due to the lack of knowledge in the influence of the large set of geometrical parameters. This paper presents the results of a combine experimental and numerical study of PKW. On the one hand, the study, led on a large scale model of PKW, aims at defining the main parameters influencing the hydraulic behaviour of the structure. On the other hand, the influence of these main parameters has been studied on several scale models considering variation of the weir height, the keys widths and the overhangs lengths. The results of the experiments enable to define optimal values for a common variation of these parameters. [less ▲]

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See detailCharacterization of an internal type-II NADH dehydrogenase from Chlamydomonas reinhardtii mitochondria
Remacle, Claire ULg

in 15th International Conference on the Cell & Molecular Biology of Chlamydomonas (2012, June)

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See detailA Newmark-type integrator for flexible systems considering nonsmooth unilateral constraints
Chen, Qiongzhong ULg; Acary, Vincent; Virlez, Geoffrey ULg et al

in Proceedings of the First Joint International Conference on Multibody System Dynamics (2012, June)

Mechanical systems are usually subjected not only to bilateral constraints but also to unilateral constraints. Inspired by the HHT time integration method for smooth flexible multibody dynamics, this ... [more ▼]

Mechanical systems are usually subjected not only to bilateral constraints but also to unilateral constraints. Inspired by the HHT time integration method for smooth flexible multibody dynamics, this paper presents a Newmark-type integrator, denoted by nonsmooth HHT method, to include the nonsmooth property of unilateral constraints. Through numerical examples accounting for both rigid and flexible body models, a bunch of methods are compared with the unilateral constraints on both velocity level and position level. Results show that the presented nonsmooth HHT method benefits from the accuracy and stability property of the classical HHT method with controllable numerical damping. In particular, when it comes to the analysis of flexible systems, the nonsmooth HHT method shows much better accuracy property than that of the other methods, including the Moreau–Jean time-stepping method and the fully implicit Newmark methods. [less ▲]

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See detailDevelopment Factors and Local Impacts of Agritourism: Comparison Between Slovenia and Walloon Region
Schmitz, Serge ULg; PotočnikSlavič, Irma

in Dubois, Charline (Ed.) Agritourism between embeddedness and internationalization (2012, June)

The bilateral research project between the Republic of Slovenia and Wallonie Bruxelles Internationale“Development Factors of Agritourism: Comparison Between Slovenia and Walloon Region” (L´agrotourisme ... [more ▼]

The bilateral research project between the Republic of Slovenia and Wallonie Bruxelles Internationale“Development Factors of Agritourism: Comparison Between Slovenia and Walloon Region” (L´agrotourisme, son fonctionnement et son rôle dans le développement local en Wallonie et Slovénie aujourd´hui et demain; Dejavnikirazvojaturizmanakmetiji: primerjava med Slovenijo in Valonijo; 2010-2012) was focused on agritourism in order to illustrate how sustainable development thinking can be applied when addressing the problems of the rural areas. It aimed as well to rethink agritourism development according to its embeddeness in order to enlighten the question which form of agritourism is suitable to which rural area and vice-versa. At the same time, agritourism is shaping and is being re-shaped by the internationalization of tourism market. [less ▲]

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See detailCombining Full Transients and Phasor Approximation Models in Power System Time Simulation
Plumier, Frédéric ULg; Fabozzi, Davide ULg; Geuzaine, Christophe ULg et al

in Proceedings of the 21th International Conference on Domain Decomposition Methods (DD21) (2012, June)

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See detailGPR detection of saturated areas into concrete in the presence of a water gradient
Louis, Arnaud ULg; Van der Wielen, Audrey ULg; Courard, Luc ULg et al

in 2012 14th International Conference on Ground Penetrating Radar (GPR) (2012, June)

In the concrete, saturated areas are most of the time limited by a transition zone, presenting a water gradient. This transition zone can affect the GPR wave’s reflection and decrease the reflection ... [more ▼]

In the concrete, saturated areas are most of the time limited by a transition zone, presenting a water gradient. This transition zone can affect the GPR wave’s reflection and decrease the reflection coefficient by comparison to the coefficient that would be obtained on a sharp interface. To quantify the impact of the water gradient on the reflection coefficient, we performed finite differences simulations. They showed that the reflection coefficient was reduced by 70% if the thickness of the transition zone was larger than 2/5 of the wavelength. Laboratory experiments, using hygrometric sensors for the water content control, confirmed this trend. [less ▲]

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See detailInfluence de la formation des aides-soignants sur l'activité: expérience belge en matière d'intégration d'un nouveau métier dans les soins à domicile
Heyden, Isabelle ULg; Noël, Stéphanie ULg; Beckers, Jacqueline ULg et al

in AMSE AMCE WAER (Ed.) Congrès Mondial de l'AMSE. Recherche en éducation et en formation: Enjeux et défis d'aujourd'hui (2012, June)

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See detailGender and success in entrepreneurship research: A critical perspective
Chasserio, Stéphanie; Constantinidis, Christina ULg; Lee-Gosselin, Hélène et al

in 12th EURAM Annual Conference Proceedings (2012, June)

This paper aims to challenge the conventional definition of success in entrepreneurship. It pinpoints the inadequacy of its masculine gendered definition to take into account the vision of women ... [more ▼]

This paper aims to challenge the conventional definition of success in entrepreneurship. It pinpoints the inadequacy of its masculine gendered definition to take into account the vision of women entrepreneurs (WEs). It focuses on the concept of success and its various meanings for WEs. The paper is grounded in three qualitative studies on WEs undertaken in Quebec, France and Belgium, reaching 151 diverse entrepreneurs. The findings reveal that the commonly accepted definition and measure of entrepreneurial success, business growth and financial performance, is not adequate for most WE s. Broader visions of success and complex meanings exist among Wes; success is a multi-dimensional reality rather than a simple dominant goal: profits or growth. Our contribution is to challenge the relevance of traditional theoretical frameworks in entrepreneurship, and we plead for their widening, for women and men. We also propose a conceptual grid to reconsider success in entrepreneurship which could be exploited in other research. [less ▲]

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See detailImproved Domain Decomposition Method for the Helmholtz Equation
Thierry, Bertrand ULg; Antoine, X.; Boubendir, Y. et al

in Proceedings of the 21th International Conference on Domain Decomposition Methods (DD21) (2012, June)

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See detailReproductive performance in F1 hybrids of two phytophilous cyprinid fish, the silver bream (Blicca bjoerkna) x the rudd (Scardinius erythrophthalmusl
Nzau Matondo, Billy ULg; Ovidio, Michaël ULg; Philippart, Jean-Claude ULg et al

in Program and Abstracts of the XIV European Congress of Ichthyology (2012, June)

Reproductive performance including the spawning behaviour and quality of gametes in cultured F1 hybrids of two phytophilous cyprinid fish species, the silver bream Blicca bioerkno x rudd Scardinius ... [more ▼]

Reproductive performance including the spawning behaviour and quality of gametes in cultured F1 hybrids of two phytophilous cyprinid fish species, the silver bream Blicca bioerkno x rudd Scardinius erythrophtalmus was investigated in this study at their first sexual maturity. The spawning behaviour was studied in terms of egg release, courting and mating acts under reproductive conditions between hybrids or mixed with the silver bream males. Behavioural experiments were conducted in experimental environments simulating natural reproductive conditions of the species using the spawning ground, high temperature, mixing of sex, natural photoperiod and no hormonal injections. The quality of gametes was evaluated by analysing egg production, sperm density, and F2 and backcross offsprings. For the egg production, the gonadosomatic index, absolute fecundity and egg diameters were analysed at spawning. sperm density was estimated by counting spermatozoa in a hemocytometer. F2 and backcross offsprings were produced from eggs of the female hybrid fertilised with the sperm of a corresponding hybrid male and a male silver bream. The results revealed that these hybrids exhibited all the reproductive behaviours of the parental species with an intense courting activity. Each egg-release act was accompanied by mating activity, involving simultaneously and successively all the experimental males, hybrids and silver bream, resulting in fertilised eggs. The quality of female sexual products was close to that found in parental species. However, the male sexual products were found more diluted, and F2 generations produced with a significantly lower hatching rate than backcrosses. This study has proven that these FL hybrids have the capacity to exhibit all the reproductive behaviour as observed in the wild population of parental species. These hybrids are fertile and thus biologically viable. ln rivers, their backcrossed offsprings have a greater chance of occurring than F2 progeny. [less ▲]

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See detailDetection of thin layers into concrete with static and CMP measurements
Van der Wielen, Audrey ULg; Courard, Luc ULg; Nguyen, Frédéric ULg

in 2012 14th International Conference on Ground Penetrating Radar (GPR) (2012, June)

Most concrete bridge decks contain a thin waterproofing layer, whose complex GPR signature can affect the detection of disorders or delaminations into the slab. In this study, we characterized the ... [more ▼]

Most concrete bridge decks contain a thin waterproofing layer, whose complex GPR signature can affect the detection of disorders or delaminations into the slab. In this study, we characterized the detection limits of our 2.3 GHz antenna for the detection of thin layers, with static and CMP measurements. In this last configuration, we showed that the radiation pattern and the reflection coefficient estimation are key parameters to use the inversion of the amplitude versus offset (AVO) curves for the estimation of the layer parameters. The theoretical results were compared to the results of FDTD simulations, performed with GprMax2D, and to laboratory measurements, performed on concrete slabs or sand containing thin layers. [less ▲]

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See detailWhat is the position of agritourism on the Walloon tourist market?
Dubois, Charline ULg; Schmitz, Serge ULg

in Potocnik, Irma (Ed.) Agritourism between embeddedness and internationalization (2012, June)

Marginal practices composed by diversified services, agritourism remains a complex subject of study in some European rural areas where it is clamed as a smart solution of diversification. Even if the ... [more ▼]

Marginal practices composed by diversified services, agritourism remains a complex subject of study in some European rural areas where it is clamed as a smart solution of diversification. Even if the phenomenon is quite weak on the Walloon tourist market, it is important from the point of view of farmers for who agritourism is a mean of supplementary incomes. Based on crossed informations and data coming from surveys of potential tourists carried out in tourist poles, life-histories of local tenants and interviews of privileged witnesses as well as content analysis of promotional folders and websites, the position of agritourism on the Walloon tourist market is analysed. It is showed firstly that agritourism is a niche market, which risk dissociating itself from the first pathway if the links between the farm and the tourism continue to weaken. Most of the time agritourism is complementary to other tourist offers but it can also compete with some other forms of tourism in particular cases. Furthermore the demand influences agritourism development through different images and representations that may go off the agricultural practices than with which farmers need to adapt their activities. Finally, different diversifications are developed according to geographic settings. [less ▲]

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See detailBackground Subtraction: Experiments and Improvements for ViBe
Van Droogenbroeck, Marc ULg; Paquot, Olivier

in Change Detection Workshop (2012, June)

Motion detection plays an important role in most video based applications. One of the many possible ways to detect motion consists in background subtraction. This paper discusses experiments led for a ... [more ▼]

Motion detection plays an important role in most video based applications. One of the many possible ways to detect motion consists in background subtraction. This paper discusses experiments led for a particular background subtraction technique called ViBe. This technique models the background with a set of samples for each pixel and compares new frames, pixel by pixel, to determine if a pixel belongs to the background or to the foreground. In its original version, the scope of ViBe is limited to background modeling. In this paper, we introduce a series of modifications that alter the working of ViBe, like the inhibition of propagation around internal borders or the distinction between the updating and segmentation masks, or process the output, for example by some operations on the connected components. Experimental results obtained for video sequences provided on the workshop site validate the improvements of the proposed modifications. [less ▲]

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See detailModélisation hydrodynamique et télémétrie : vers de nouvelles connaissances pour l'écologie des poissons du Rhône
Capra, Hervé; Ovidio, Michaël ULg; McNeil, Eric et al

in IS Rivers Extended Abstract book (2012, June)

The article presented herein aims to demonstrate how a two-dimensional hydrodynamic model representing abiotic conditions can be used to study the behaviour of fish affected by large fluctuations of ... [more ▼]

The article presented herein aims to demonstrate how a two-dimensional hydrodynamic model representing abiotic conditions can be used to study the behaviour of fish affected by large fluctuations of environmental conditions in the Rhône River. This represents a major advancement in the understanding of aquatic community structures and in particular, for the structure of fish communities that are rarely used in France. For the first time, the environmental conditions affecting fish and their spatial localization will be simultaneously known. The model can also simulate habitat conditions and water temperatures over longer time frame. For example, this methodology is compatible with the monitoring of fish communities of the Rhône River, which was initiated in 1979. The interest in modeling precise habitat and temperature conditions with hydrodynamic models for a large array of flows allows one to consider the role that these two key environmental factors play on fish behaviour. [less ▲]

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See detailLaser thermoreflectance for semiconductor thin films metrology
Gailly, Patrick ULg; Hastanin, Juriy ULg; Duterte, Charles et al

in Wehrspohn, R. B., Gombert, A (Ed.) Photonics for Solar Energy Systems IV (2012, June)

We present a thermoreflectance-based metrology concept applied to compound semiconductor thin films off-line characterization in the solar cells scribing process. The presented thermoreflectance setup has ... [more ▼]

We present a thermoreflectance-based metrology concept applied to compound semiconductor thin films off-line characterization in the solar cells scribing process. The presented thermoreflectance setup has been used to evaluate the thermal diffusivity of thin CdTe films and to measure eventual changes in the thermal properties of 5 μm CdTe films ablated by nano and picosecond laser pulses. The temperature response of the CdTe thin film to the nanosecond heating pulse has been numerically investigated using the finite-difference time-domain (FDTD) method. The computational and experimental results have been compared. [less ▲]

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See detailLes représentations externes en collaboration créative.Etude d’un cas de réunions de conception architecturale
Joachim, Guillaume ULg; Safin, Stéphane ULg; Roosen, Marie ULg

in Guéna, François; Lecourtois, Caroline (Eds.) Complexité(s) des modèles de l'architecture numérique (2012, June)

Le développement d’un projet architectural est accompagné de formes diverses de représentations externes telles que le croquis, les gestes, la maquette tridimensionnelle ou la photographie. La génération ... [more ▼]

Le développement d’un projet architectural est accompagné de formes diverses de représentations externes telles que le croquis, les gestes, la maquette tridimensionnelle ou la photographie. La génération et la manipulation de ces représentations permettent à la fois de résoudre des problèmes de conception architecturale et de soutenir l'exploration de solutions créatives. Cet article a pour objectif, via une exploration théorique et une approche exploratoire du terrain professionnel, de décrire différents enjeux de l’utilisation conjointe de formes différentiées de représentations externes dans les premières phases du processus de projet et particulièrement en réunions de conception. [less ▲]

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See detailAssessment of the ecological status of P. oceanica meadow with a no destructive shoot method
Gobert, Sylvie ULg; Lejeune, Pierre ULg; Chéry, Aurélia et al

in Proceedings of the Mediterranean Seagrass Workshop 2012 (2012, June)

Posidonia oceanica (L.) Delile is a protected species, included in the Red list of marine threatened species of the Mediterranean. Because of its sensitivity to disturbance, P. oceanica is used as a ... [more ▼]

Posidonia oceanica (L.) Delile is a protected species, included in the Red list of marine threatened species of the Mediterranean. Because of its sensitivity to disturbance, P. oceanica is used as a bioindicator to define the health status of coastal waters. Monitoring methods generally require to sample plants, followed by measurements on picked shoots. This implies the total destruction of several tens of shoots. This study presents a method, “The Non Destructive Shoot Methodology”: NDSM, that permits the measurement of (1) the most used seagrass metrics, (2) the determination of C, N, P contents and (3) the measurement of the trace metal levels in P. oceanica leaves. Our technic has been firstly tested by comparison with the results obtained with classic method of biometry. Secondly, differences between levels of C, N, P and trace metals obtained with classic picking and our methodology were tested. Thirdly, the physiological consequences on the shoots were investigated (% of survival, growth, essential element contents (C, N, P, Fe, Cu...). The NDSM gives similar results to classic investigations to assess the ecological status of P. oceanica meadow (i.e. PREI, BiPO...) and avoid the uprooting of the “K-strategist” protected species. This methodology is usable in cases of monitoring and impact studies. [less ▲]

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See detailExperimental and numerical investigation of a meandering jet in shallow rectangular reservoirs under different hydraulic conditions
Camnasio, Erica; Pirotton, Michel ULg; Erpicum, Sébastien ULg et al

in 3rd International Symposium on Shallow Flows (2012, June)

A central meandering jet in shallow rectangular reservoirs has been investigated numerically by the model WOLF2D, on the basis of experimental evidence of this type of flow field in two different setups ... [more ▼]

A central meandering jet in shallow rectangular reservoirs has been investigated numerically by the model WOLF2D, on the basis of experimental evidence of this type of flow field in two different setups at different scales. A sensitivity analysis has been conducted with respect to the main parameters of the model. The oscillation frequency of the transversal velocity and the characteristic Strouhal number have been calculated for different Froude numbers. A logarithmic relationship has been found between the Strouhal and the Froude numbers. [less ▲]

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See detailDes mots pour se dire: Développement de la fonction narrative chez l'enfant.
Boulard, Aurore ULg; Poudat, Céline; Gauthier, Jean-Marie ULg

in Dister, Anne; Longrée, Dominique; Purnelle, Gérald (Eds.) Proceedings of the 11th International Conference on Textual Data Statistical Analysis (2012, June)

The present study is based on a corpus made of spontaneous oral speech: 136 children aged from 3 to 13 have been recorded in three different environments that are favorable to the production of self ... [more ▼]

The present study is based on a corpus made of spontaneous oral speech: 136 children aged from 3 to 13 have been recorded in three different environments that are favorable to the production of self-narratives. Using linguistic annotations and tried and tested text statistics methods, we have been able to show different aspects of the development of narratives and self-narratives in children speeches, including the impact of age and environment on the construction of narratives. The results we obtained are significant, and we hope we succeeded in demonstrating how relevant text statistics methods are when applied to clinical psychology. [less ▲]

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See detailKeratinocyte-restricted RabGEF-1 expression is a key regulator of skin homeostasis in vivo
Marichal, Thomas ULg; Reber, Laurent; Tam, See Ying et al

in Proceedings of Stanford Pathology Retreat (2012, June)

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See detailMulti-disciplinary research on long-term Middle to Upper Devonian fore-reef successions from Germany and Austria
Pas, Damien ULg; Da Silva, Anne-Christine ULg; Cornet, Pierre et al

in Kido, Erika; Suttner, Thomas; Werer, Piller (Eds.) et al Berichte des Institutes für Erdwissenschaften, Karl-Franzens-Universität Graz (2012, June)

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See detailModelling the Position Control of a Segment of the E-ELT using OOFELIE::Multiphysics Integrated FEM-based Approach
Nachtergaele, Philippe; Gamonal Rozas, Leonardo Alfredo ULg; Bruls, Olivier ULg

in Proceedings of the 13th International Conference on New Actuators (2012, June)

This paper presents the extension of a multiphysics software solution allowing to perform integrated simulation of multiphysics controlled systems. This enhancement relies on an innovative formulation of ... [more ▼]

This paper presents the extension of a multiphysics software solution allowing to perform integrated simulation of multiphysics controlled systems. This enhancement relies on an innovative formulation of time integration schemes allowing to take into account simultaneously, in an integrated FEM-based approach, the non linear structural response of a system and the controller dynamics. Interest and feasibility of this unified approach is illustrated through the Modelling of the position control of a segment of the primary mirror of the E-ELT (European Extremely Large Telescope), a highly representative application of complex multiphysics controlled systems. [less ▲]

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See detailEvaluation of the acoustic comfort of air-treatment systems with a multi-task procedure
Minard, Antoine; Robin, Benjamin; Fournier, Francette et al

in E.A.A. (Ed.) Proceedings of the 2012 Euronoise Congress (2012, June)

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See detailAdvanced Engine Dynamics Using MBS and a Mixed Nonlinear FEM and Super Element Approach
Louvigny, Yannick ULg; Duysinx, Pierre ULg

in Eberhard; Ziegler (Eds.) Proceedings of the IMSD2012 - The 2nd Joint International Conference on Multibody System Dynamics (2012, May 31)

Dynamic simulations of a twin-cylinder boxer engine are carried out with rigid and flexible multibody models. Pistons and connecting rods are considered as rigid bodies while the crankshaft is modeled as ... [more ▼]

Dynamic simulations of a twin-cylinder boxer engine are carried out with rigid and flexible multibody models. Pistons and connecting rods are considered as rigid bodies while the crankshaft is modeled as a flexible part and meshed with brick elements. With this model, calculation of crankshaft stresses and displacements is possible. For constant speed studies, flexible simulations are carried out on one or two engine cycles but simulations with a variable rotation speed has to be performed on a larger number of engine revolutions. Due to the complex shape of the crankshaft, the simulation times become important and it is difficult to keep on working with the complete crankshaft model. Thus several simplified models, including super element models, are developed. In this paper, a particular method, using also the super element technique, is proposed. A large part of the crankshaft is substructured and modeled with super elements. While a critical area, identified by a simulation performed with a coarse crankshaft mesh, is not modified and modeled by nonlinear finite element. Several methods of linking the super elements and the finite element mesh are experimented. Once the best connection method determined, results and computation time of the simulation using this model will be compared to those obtained with the complete crankshaft model and the other simplified models. [less ▲]

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See detailTrace element kinetics in contaminated Posidonia oceanica meadow
Richir, Jonathan ULg; Luy, Nicolas; Lepoint, Gilles ULg et al

in Proceedings of the Mediterranean Seagrass Workshop 2012 (2012, May 29)

The seagrass Posidonia oceanica (L.) Delile is widely used since the mid-70th to biomonitor trace elements (TEs). However, there is a lack of knowledge regarding to pollutant kinetics in that species ... [more ▼]

The seagrass Posidonia oceanica (L.) Delile is widely used since the mid-70th to biomonitor trace elements (TEs). However, there is a lack of knowledge regarding to pollutant kinetics in that species. Posidonia oceanica were in situ contaminated by a mix of 15 TEs (Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Mo, Ag, Cd, Pb and Bi) at experimental levels equivalent to 10 (moderate) and 100 (acute) times seawater average concentrations. TEs concentrations were measured by ICP-MS in P. oceanica leaves and rhizomes sampled at regular time intervals, in epiphytes, in water and in sediment. Posidonia oceanica immediately accumulated pollutants from the beginning of experiments; once contaminations ended, TE concentrations came back to their original levels within two weeks, or at least showed a clear decrease. Leaves exhibited different uptake kinetics for many elements (e.g. Cr, Cu, Ag, Bi etc.): the younger growing leaves forming new tissues incorporated chemicals more rapidly than the older senescent leaves. Rhizomes did not show any clear trend, except for Cu, Zn and Bi. Results demonstrate that P. oceanica is a very sensitive sentinel to immediately delineate punctual pollutions similar to what might be measured in contaminated Mediterranean waters. The good response of P. oceanica leaves to pollutant short-term expositions suggests their routine use in regularly scheduled monitoring programs. Nevertheless, to by-pass P. oceanica leaves deciduous character and their capability to detoxify rapidly, long term accumulation recordings would also necessitate belowground tissues analyses. [less ▲]

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See detailL1-based compression of random forest models
Joly, Arnaud ULg; Schnitzler, François ULg; Geurts, Pierre ULg et al

in Proceeding of the 21st Belgian-Dutch Conference on Machine Learning (2012, May 24)

Random forests are effective supervised learning methods applicable to large-scale datasets. However, the space complexity of tree ensembles, in terms of their total number of nodes, is often prohibitive ... [more ▼]

Random forests are effective supervised learning methods applicable to large-scale datasets. However, the space complexity of tree ensembles, in terms of their total number of nodes, is often prohibitive, specially in the context of problems with very high-dimensional input spaces. We propose to study their compressibility by applying a L1-based regularization to the set of indicator functions defined by all their nodes. We show experimentally that preserving or even improving the model accuracy while significantly reducing its space complexity is indeed possible. [less ▲]

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See detailApproximation efficace de mélanges bootstrap d’arbres de Markov pour l’estimation de densité
Schnitzler, François ULg; Ammar, Sourour; Leray, Philippe et al

in Bougrain, Laurent (Ed.) Actes de la 14e Conférence Francophone sur l'Apprentissage Automatique (CAp 2012) (2012, May 23)

Nous considérons des algorithmes pour apprendre des Mélanges bootstrap d'Arbres de Markov pour l'estimation de densité. Pour les problèmes comportant un grand nombre de variables et peu d'observations ... [more ▼]

Nous considérons des algorithmes pour apprendre des Mélanges bootstrap d'Arbres de Markov pour l'estimation de densité. Pour les problèmes comportant un grand nombre de variables et peu d'observations, ces mélanges estiment généralement mieux la densité qu'un seul arbre appris au maximum de vraisemblance, mais sont plus coûteux à apprendre. C'est pourquoi nous étudions ici un algorithme pour apprendre ces modèles de manière approchée, afin d'accélérer l'apprentissage sans sacrifier la précision. Plus spécifiquement, nous récupérons lors du calcul d'un premier arbre de Markov les arcs qui constituent de bons candidats pour la structure, et ne considérons que ceux-ci lors de l'apprentissage des arbres suivants. Nous comparons cet algorithme à l'algorithme original de mélange, à un arbre appris au maximum de vraisemblance, à un arbre régularisé et à une autre méthode approchée. [less ▲]

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See detailLa césarienne chez la vache : entre théorie et pratique
Hanzen, Christian ULg

in Proceedings des journées nationales vétérinaires (2012, May 23)

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See detailL’urovagin chez la vache laitière : effets sur les performances de reproduction et traitement chirurgical
Hanzen, Christian ULg; Theron, Léonard ULg

in Proceedings des journées nationales des groupements techniques vétérinaires 2012 (2012, May 23)

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See detailUse of contaminated recycled aggregates for concrete design: properties and durability
Courard, Luc ULg; Michel, Frédéric ULg; Debieb, Farid

in Zajc, Andrej (Ed.) Doseganje posebnih lastnosti betonov z uporabo odpadlih materialov (2012, May 23)

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia ... [more ▼]

Construction waste management is a quite important economic and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia, Southern Region of Belgium; recycling has clearly to be promoted. Roller Compacted Concrete (RCC) is a special dry concrete made of aggregates, water and low quantity of cement, laid down and compacted like a soil, for the construction of massive structures like dams or large horizontal surfaces like road foundations. Replacement of natural aggregates by concrete road recycled aggregates in the mix design of concrete is a solution to decrease nature depletion. Natural concrete slabs were cured in water, sea water, chloride solutions or sulphate solutions and then crushed to obtain virgin and contaminated (polluted) recycled aggregates. The aim of this research is the total replacement (100% coarse and fine) of natural aggregates (NA) by recycled concrete aggregates (RA) in the composition of a roller compacted concrete. The natural and recycled aggregates are characterised and compared. The mechanical properties and durability performances of concrete with contaminated RA are analysed. The experimental results showed that the polluted RA are much richer in chlorides than in sulphates and are leached if they are soaked in water. Significant differences were observed between the properties of original and new concrete and the results demonstrated the need of taking these contaminations into account. [less ▲]

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See detailEl sindrome tiro-gastrico : screening en 410 pacientes atendidos pro patologia tiroidea
Tome, M; VALDES SOCIN, Hernan Gonzalo ULg; Auriemma, R et al

in Abstract book - 54 Congreso Sociedad Espanola de Endocrinologia y nutrition (2012, May 23)

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See detailSeguimiento prospectivo ecocardiografico de 104 pacientes con enffermedades endocrinologicas tratados con cabergolina
Daly, Adrian ULg; VROONEN, Laurent ULg; Lancellotti, Patrizio ULg et al

in Abstract book - 54 Congreso Sociedad Espanola de Endocrinologia y nutrition (2012, May 23)

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See detailCaracteristicas de prolactinomas resisitentes a dosis estandar de cabergolina : un estudio multicentrico en 92 pacientes
Beckers, Albert ULg; Jaffrain-Réa, ML; VROONEN, Laurent ULg et al

in Abstract book - 54 Congreso Sociedad Espanola de Endocrinologia y nutrition (2012, May 23)

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See detailLow temperature assembly method of microfluidic bio-molecules detection device
Van Loo, Stéphanie ULg; Stoukatch, Serguei ULg; Van Overstraeten-Schlögel, Nancy et al

in Suga, Tadatomo; Takagi, Hideki; Higurashi, Heiji (Eds.) 2012 3rd IEEE International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D 2012) (2012, May 22)

We developed a microfluidic device for the detection of bio-molecules. The active part of the device is a biofunctionalized interdigitated capacitive sensor. The microsystem consists of a sensor on ... [more ▼]

We developed a microfluidic device for the detection of bio-molecules. The active part of the device is a biofunctionalized interdigitated capacitive sensor. The microsystem consists of a sensor on silicon chip, a microfluidic channel formed by photo-patternable resist and a plastic cover. We implemented a low temperature packaging process to assemble the sensor and prevent the biological material from degradation. [less ▲]

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See detailAlteration de l'interaction entre le Soi et la mémoire dans la maladie d'Alzheimer
Genon, Sarah ULg; Collette, Fabienne ULg; Salmon, Eric ULg et al

in Maladie d'Alzheimer et déclin cognitif: recherche et pratique clinique (2012, May 22)

Le Soi et la mémoire sont deux systèmes en interaction chez l’homme. Ainsi, une information qui a été traitée en référence à soi fait l’objet de meilleures performances mnésiques qu’une information qui ... [more ▼]

Le Soi et la mémoire sont deux systèmes en interaction chez l’homme. Ainsi, une information qui a été traitée en référence à soi fait l’objet de meilleures performances mnésiques qu’une information qui n’est pas liée au Soi. Ce phénomène cognitif bien connu est appelé « l’effet de référence à soi en mémoire » (« Self Reference Effect », SRE ; 1). En outre, le rappel d’une information qui a été reliée à soi est davantage associé à une expérience recollective (souvenir du contexte d’apprentissage), phénomène appelé le « Self-reference recollection effect » (SRRE ; 2). Dans la maladie d’Alzheimer (MA), l’expérience recollective est sévèrement altérée (3). Si le SRE est principalement sous-tendu par l’expérience recollective, il devrait donc être diminué chez les patients avec MA. Dix-huit patients avec MA à un stade débutant et 21 sujets volontaires de contrôle ont réalisé une première tâche dans laquelle des adjectifs leur étaient présentés. Pour chaque adjectif, ils devaient dans un premier temps soit indiquer si le trait s’appliquait à eux-mêmes (condition soi) soit indiquer si le trait s’appliquait au Roi Albert/à la Reine Fabiola (condition autrui). Dans un second temps, les adjectifs des deux conditions (soi et autrui) étaient mélangés à de nouveaux adjectifs. Pour chaque adjectif, les participants devaient indiquer s’ils avaient vu l’adjectif dans les essais précédents ou non. Quelques jours plus tard, la même procédure était administrée aux participants avec un nouveau set d’adjectifs comparables à ceux de la première tâche, excepté que pour chaque adjectif que les participants indiquaient avoir préalablement vu, ils devaient décrire l’expérience qui avait guidé leur réponse (sentiment de familiarité, expérience recollective ou autre). Concernant la première tâche, l’analyse de la proportion d’adjectifs correctement reconnus révèle que le groupe contrôle présente un SRE alors que cet effet est absent dans le groupe avec MA. Concernant la seconde tâche, l’analyse des proportions de reconnaissances correctes basées (1) sur une expérience recollective et (2) sur un sentiment de familiarité révèle (1) que le groupe contrôle présente un SRRE alors que cet effet est absent dans le groupe MA, (2) que la proportion de réponses correctes basées sur un sentiment de familiarité est similaire entre les deux types d’adjectifs (soi et autrui) et ce dans les deux groupes. Chez les personnes âgées normales, l’information associée au Soi en mémoire est davantage récupérée sur base d’une expérience recollective, menant à de meilleures performances pour ce type d’information que pour une information non reliée au Soi. En revanche, chez les patients avec MA, l’interaction entre le Soi et la mémoire est altérée en ce sens que l’information relative à soi ne bénéficie pas d’une meilleure récupération en raison de la pauvre qualité du processus recollectif. Ces données suggèrent donc que chez les patients avec MA, même à un stade débutant de la maladie, la récupération en mémoire d’information relative à soi est quantitativement et qualitativement altérée. 1) T. Rogers, N. Kuiper, W. Kirker. Journal of Personality and Social Psychology 37, 677 (1977). 2) M. Conway, S. Dewhurst. Applied Cognitive Psychology 9, 1 (1995). 3) G. Della Barba. Memory 5, 657 (1997). [less ▲]

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See detailProjet HETICE : encourager et promouvoir une utilisation efficace et réfléchie des TICE dans l'enseignement supérieur
Risack, Zoé ULg; Denis, Brigitte ULg

in Actes du 27e Congrès International de Pédagogie Universitaire : Quelle pédagogie pour demain ? (2012, May 17)

Comme tout citoyen, l’enseignant est concerné par un usage efficace et réfléchi des Technologies de l’Information et de la Communication (TIC). Toutefois, au niveau des professeurs de l’enseignement ... [more ▼]

Comme tout citoyen, l’enseignant est concerné par un usage efficace et réfléchi des Technologies de l’Information et de la Communication (TIC). Toutefois, au niveau des professeurs de l’enseignement supérieur, comme aux autres niveaux, il n’est pas toujours évident de les intégrer à bon escient dans ses pratiques de formation. Plus particulièrement, trois difficultés sont identifiées : l’absence de curriculum de formation des futurs enseignants quant à la maîtrise des TIC, le manque de maîtrise des TIC par les professeurs et une difficulté à gérer le partage des connaissances et des pratiques entre enseignants. Depuis 2000, le projet HETICE (Hautes Écoles et Technologies de l’Information et de la Communication en Éducation) mené par le CRIFA (Centre de Recherche sur l’Instrumentation la Formation et l’Apprentissage) de l’Université de Liège contribue à apporter une réponse appropriée aux problèmes précités. Un des axes de ce projet vise la création et la pérennisation d’un réseau de partage de ressources et de points de vue entre professionnels, voire le développement d’une communauté de pratique. Parmi les activités de ce réseau, citons la diffusion de l’information via différents canaux (site internet, newsletter, blog…), la capitalisation de ressources existantes au sein du réseau, l’organisation de colloques et de réunions plénières… Lors de ce congrès, un bilan des activités menées au cours des dix dernières années sera présenté sous différents angles comme le type d’activités proposées et menées par le réseau (plénières, colloques,…), les actions des enseignants au sein du réseau (participation aux formations, diffusion d’informations…), les éléments favorisant la mise en place d’un tel réseau ainsi que certains écueils rencontrés. Par ailleurs, nous épinglerons les facteurs susceptibles de transférer une telle mise en réseau d’enseignants du supérieur. [less ▲]

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See detailObjects or intentional objects? Twardowski and Husserl on inexistent entities
Gyemant, Maria ULg

in Seron, Denis; Leclercq, Bruno; Richard, Sébastien (Eds.) Objects and pseudo-objects (2012, May 15)

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See detailÉduCoP : la communauté de pratique des étudiants en sciences de l'éducation de l'Université de Liège (Belgique)
Bomgart, Marie-Laure ULg; Denis, Brigitte ULg

in Actes du 27e Congrès International de Pédagogie Universitaire : Quelle pédagogie pour demain ? (2012, May 15)

Le concept de communauté de pratique (Community of Practice ou CoP en anglais) occupe une place de plus en plus importante dans le domaine de la formation. Par ailleurs, les outils informatisés sont ... [more ▼]

Le concept de communauté de pratique (Community of Practice ou CoP en anglais) occupe une place de plus en plus importante dans le domaine de la formation. Par ailleurs, les outils informatisés sont souvent employés pour supporter les activités de ces communautés. À ce jour, même si la plupart des étudiants qui entrent à l'université sont familiarisés avec les technologies, il est toutefois moins fréquent qu'ils les utilisent pour partager de manière durable des informations, collaborer, produire et capitaliser des connaissances. Le projet ÉduCoP, initié en 2010 à l'Université de Liège, vise à développer et pérenniser une communauté de pratique constituée d'apprenants en Sciences de l'Éducation. La constitution d'une telle communauté s'élabore progressivement et nécessite la mise en œuvre de différentes actions ainsi qu'un suivi. Il faut notamment assurer la continuité des activités et la relève au fil des années. Nous présentons ici l'analyse des besoins, des enjeux et des motivations des étudiants à s'engager dans le projet ; le choix d'outils technologiques à mettre à leur disposition (la plateforme eGroupWare) et des formations à leur usage ; la mise en place d'activités pour développer l'identité des membres de la CoP et les amener à débattre de thématiques communes, à produire et à partager des ressources. De plus, nous exposons le processus de collecte de données qui permet de mesurer l'évolution de la communauté. Si les actions entreprises offrent des résultats très encourageants, des freins à la création et à l'évolution d'une telle CoP ont néanmoins été identifiés (ex. manque de culture technologique des membres, réticence à partager les productions personnelles). Par conséquent, une des missions prioritaires du projet ÉduCoP visent à pallier ces manques. À terme, notre objectif est de proposer un guide de recommandations à d'autres facultés et universités qui souhaiteraient entreprendre la mise en réseau et la création de communautés de pratique d'apprenants. [less ▲]

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See detailAre performance-related characteristics associated with sports injuries in young soccer players?
Frisch, Anne ULg; Urhausen, Axel; Seil, Romain et al

in 3rd World Conference on Science and Soccer, Ghent, Belgium 14-16 May 2012 (2012, May 15)

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See detailAccumulation de particules de microplastiques dans le neuston en Méditerranée Occidentale et au large de la Corse
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Collard, France ULg et al

in Séminaire sur le milieu marin : 14 au 16 mai 2012 STARESO Corse (2012, May 13)

Des mesures réalisées lors de diverses campagnes océanographiques ont montré la présence de microparticules de plastiques de diverses natures à la surface des mers avec de hauts niveaux de concentration ... [more ▼]

Des mesures réalisées lors de diverses campagnes océanographiques ont montré la présence de microparticules de plastiques de diverses natures à la surface des mers avec de hauts niveaux de concentration et une large dispersion géographique. La taille de ces microplastiques est inférieure à 5 mm et voisine de celle du mésozooplancton. Ces microplastiques s’accumulent dans la couche de surface de la mer qui constitue l’habitat neustonique et qui héberge des assemblages zooplanctoniques particulièrement adaptés à ces conditions extrèmes. Cet habitat est essentiel pour la ponte et la survie des œufs de nombreux poissons et pour le recrutement des juvéniles. Une étude récente que nous avons réalisée au niveau du bassin Nord Occidental Méditerranéen et au large de la Corse (Campagne MED) a montré des concentrations de 0.116 particules/m2 et un rapport moyen de la masse de microplastique à celle du mésozooplancton de 0.5. Ceci nous suggère la potentialité d’une confusion entre les proies et les microplastiques pour les organsismes se nourrissant de zooplancton (Collignon et al., 2012). Une étude de la variabilité de ces microplastiques dans le neuston et l’impact sur celui-ci est actuellement en cours en Baie de Calvi à STARESO. Références : Collignon, A., Hecq, J.-H., Galgani, F., Voisin, P., Collard, F., Goffart, A., 2012. Neustonic microplastic and zooplankton in the North Western Mediterranean Sea. Mar. Pollut. Bull. (In Press). http://dx.doi.org/10.1016/j.marpolbul.2012.01.011 [less ▲]

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See detailSpatial and/or visual short-term memory deficit in unilateral neglect
Wansard, Murielle ULg; Meulemans, Thierry ULg; Bartolomeo, Paolo

in 1st Joint Meeting of the Belgian Association for Psychological Science and Sociedad Espanola de Psicologia Experimental. (2012, May 11)

Patients suffering from left unilateral neglect fail to perceive or respond to stimuli presented within the contralesional space. Neglect is generally considered as involving an attentional bias towards ... [more ▼]

Patients suffering from left unilateral neglect fail to perceive or respond to stimuli presented within the contralesional space. Neglect is generally considered as involving an attentional bias towards the ipsilateral side. Recently, it has been suggested that revisiting and perseveration behaviors in visual search tasks shown in parietal neglect could be related to impairment in visuo-spatial working memory (Husain et al., 2001; Wojciulik et al., 2001). The aim of the present study was to investigate which aspect of visuo-spatial working memory is involved in unilateral neglect. Indeed, different source of evidence support the idea that visuo-spatial working memory involves at least two separate cognitive subsystems: the visual cache and the inner scribe (Logie, 1995; Pickering et al., 2001). We assessed thirteen right-damaged patients suffering from left neglect on two experimental task involving either spatial (Corsi test) or visual (Span test) working memory. Results show that visual and/or spatial working memory can be impaired in spatial neglect. This double dissociation provides neuropsychological support for the separation of visuo-spatial working memory into two subcomponents. The clinical and anatomical implications of this finding are discussed. [less ▲]

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See detailDoes fluid intelligence protect from age-related decline in cognitive control ?
Manard, Marine ULg; Carabin, Delphine; Collette, Fabienne ULg

in Proceedings of the BAPS - SEPEX meeting (2012, May 11)

Age-related difficulties have been reported on proactive control whereas reactive control seems to remain intact. This study investigated the potential influence of fluid intelligence capacity on the age ... [more ▼]

Age-related difficulties have been reported on proactive control whereas reactive control seems to remain intact. This study investigated the potential influence of fluid intelligence capacity on the age-related decline in proactive control. We used a working memory recognition paradigm involving proactive or reactive cognitive control by manipulating the interference level across items. 80 young adults (18-29 years old) and 80 healthy older adults (60-89 years old) were included. The main results revealed significant effects of age and fluid intelligence capacity on sensitivity to interference. As expected, reactive control performance remained intact with aging (similar interference effect in the two groups). In contrast, we observed a larger interference effect in the proactive condition in aging. Finally, older participants with similar level of fluid intelligence to young adults showed no proactive control age-related decrement. Beyond the fact that this study confirms the selective age-related decline in proactive control, it also indicates that the level of fluid intelligence influences the efficiency of proactive control in aging. [less ▲]

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See detailProcedural learning in Developmental Coordination Disorder
Lejeune, Caroline ULg; Catale, Corinne ULg; Schmitz, Xavier ULg et al

in Books of Abstract: 1st Joint Meeting of the Belgian Association for Psychological Science & Sociedad Espanola de Psicologica Experimental (2012, May 11)

Developmental Coordination Disorder (DCD) is a developmental disorder characterized by marked impairments in motor skills. Despite its negative impact on daily activities and on cognitive and academic ... [more ▼]

Developmental Coordination Disorder (DCD) is a developmental disorder characterized by marked impairments in motor skills. Despite its negative impact on daily activities and on cognitive and academic performance, the mechanisms underlying DCD remain largely unknown. The aim of our study was to investigate the hypothesis of a motor procedural learning impairment in DCD, which would explain difficulties in motor learning and automation of novel motor skills in these children. A total of 32 children (16 with DCD and 16 typically developing [TD] children) aged between 6 and 12 years old participated in this study. Children were administered a task adapted from the traditional shapes’ mirror-tracing task. Results showed that DCD children were able to learn the skill as fast as TD children; the learning pattern of DCD and TD children in motor procedural learning is similar. But is there any generalization of a new perceptual-motor skill in DCD children? Actually, DCD children were slower during the transfer task (triangle task) than TD children; the transfer task was more difficult for the DCD children than their peers. DCD children and TD children differ in their abilities to generalize the motor schema to a new task, more complex. These results confirm the hypothesis of a motor procedural learning impairment in DCD. [less ▲]

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See detailSelf-appraisal and medial prefrontal activation in early stage Alzheimer’s disease
Genon, Sarah ULg; Collette, Fabienne ULg; Angel, Lucie et al

in Proceedings of the 1st Joint Meeting of the Belgian Association for Psychological Sciences (BAPS, Belgium) and Sociedad Espanola de Psicologia Experimental (SEPEX, Spain) (2012, May 10)

Introduction Self-referential processing in healthy subjects is related to activation within cortical midline structures, such as the medial prefrontal cortex (MPFC) and the posterior cingulate cortex ... [more ▼]

Introduction Self-referential processing in healthy subjects is related to activation within cortical midline structures, such as the medial prefrontal cortex (MPFC) and the posterior cingulate cortex (Northoff et al., 2006). The structures are known to be altered in Alzheimer’s disease (AD; Buckner et al., 2008). However, little is known about their engagement during self-referential processing in AD patients. Methods Twenty-two mild AD patients and 22 healthy controls (HC) were administered a self-appraisal task in an fMRI experimentation. The participants saw adjectives and had to indicate if the trait describes them (Self-condition; SC) or the King Albert II/the Queen Fabiola (Other-condition; OC). We examined differences between groups (HC>AD and AD>HC) and a conjunction analysis examined brain activations that were common to both groups during the self-appraisal process (p<.001 uncorrected with a-priori hypotheses). Results No region was found to be significantly more activated during self-appraisal in HC than in AD and vice versa. The VMPFC was the only region commonly activated in AD and HC during self-appraisal process (Punc<.001). Conclusions The study demonstrates that AD patients at early stages of the disease may still engage the MPFC during self-referential processing (compared to a well-known but not close “other”) as HC do. References: Northoff, G., Heinzel, A., de Greck, M., Bermpohl, F., Dobrowolny, H. & Pankseepp, J. (2006). Self-referential processing in our brain-A meta-analysis of imaging studies on the self. NeuroImage, 31, 440-457. Buckner, R.L., Andrews-Hanna, J.R., Schacter, D.L. (2008). The brain’s default network: anatomy, function and relevance to disease. Annals of the New York Academy of Sciences 1124, 1-38. [less ▲]

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See detailImaging Guided Proteomics Unveils Heterogeniety in Colorectal Carcinoma Liver Metastases – Implications for Targeted Therapies.
blomme, Arnaud; Turtoi, Andrei ULg; Delvaux, David ULg et al

in Proceedings Giga Day 2012 (2012, May 04)

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See detailZero Drift in Mean Anomaly of the Satellite of 1996 FG3 and its Implication for the BYORP Theory
Scheirich, P.; Pravec, P.; Mottola, S. et al

in Asteroids, Comets, Meteors 2012, Proceedings of the conference (2012, May 01)

An analysis of photometric observations of binary Near-Earth asteroid (175706) 1996 FG3, taken from 1996 to 2012, gave a single solution for a quadratic drift of the mean anomaly of the satellite, 0.0 deg ... [more ▼]

An analysis of photometric observations of binary Near-Earth asteroid (175706) 1996 FG3, taken from 1996 to 2012, gave a single solution for a quadratic drift of the mean anomaly of the satellite, 0.0 deg/yr^2, consistent with recent BYORP theory. [less ▲]

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See detailSpectroscopic binary processing within Gaia DPAC
Damerdji, Yassine ULg; Morel, Thierry ULg; Gosset, Eric ULg

in Orbital Couples: Pas de Deux in the Solar System and the Milky Way (2012, May 01)

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See detailConstraining Outgassing Activity in the Main-Belt Comet 176P/LINEAR with Herschel
de Val-Borro, M.; Hartogh, P.; Biver, N. et al

in Asteroids, Comets, Meteors 2012, Proceedings of the conference (2012, May 01)

176P/LINEAR was observed with the Heterodyne Instrument for the Far Infrared (HIFI) on-board Herschel. The line emission from the fundamental transition of water at 557 GHz was searched for and an upper ... [more ▼]

176P/LINEAR was observed with the Heterodyne Instrument for the Far Infrared (HIFI) on-board Herschel. The line emission from the fundamental transition of water at 557 GHz was searched for and an upper limit on its production was inferred. [less ▲]

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See detailMagnetic field studies of massive main sequence stars
Schöller, M.; Hubrig, S.; Ilyin, I. et al

in American Institute of Physics Conference Series (2012, May 01)

We report on the status of our spectropolarimetric observations of massive stars. During the last years, we have discovered magnetic fields in many objects of the upper main sequence, including Be stars ... [more ▼]

We report on the status of our spectropolarimetric observations of massive stars. During the last years, we have discovered magnetic fields in many objects of the upper main sequence, including Be stars, β Cephei and Slowly Pulsating B stars, and a dozen O stars. Since the effects of those magnetic fields have been found to be substantial by recent models, we are looking into their impact on stellar rotation, pulsation, and stellar winds. Accurate studies of the age, environment, and kinematic characteristics of the magnetic stars are also promising to give us new insight into the origin of the magnetic fields. Furthermore, longer time series of magnetic field measurements allow us to observe the temporal variability of the magnetic field and to deduce the stellar rotation periods and the magnetic field geometry. Studies of the magnetic field in massive stars are indispensable to understand the conditions controlling the presence of those fields and their implications for the stellar physical parameters and evolution. [less ▲]

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See detailGBS AND THE NEONATE: PREVENTION STRATEGIES
MELIN, Pierrette ULg

in MELIN, Pierrette (Ed.) Abstract book of 30th Annual Meeting of the European Society for Paediatric Infectious Diseases (2012, May)

Streptococcus agalactiae, or group B streptococcus (GBS), remains the leading cause of neonatal sepsis and meningitis, early onset and late onset diseases (EOD, LOD). Where consensus guidelines to detect ... [more ▼]

Streptococcus agalactiae, or group B streptococcus (GBS), remains the leading cause of neonatal sepsis and meningitis, early onset and late onset diseases (EOD, LOD). Where consensus guidelines to detect and treat intrapartum women with GBS colonization have been widely adopted, incidence of neonatal EOD has dramatically declined. In response to both successful impacts on the incidence of GBS-EOD and analyses of missed opportunities, the first American guidelines for prevention issued in the 90s have since been adapted in several stages to improve their efficacy. In some countries in Europe, nationwide guidelines, whether screening-based or risk-based, for the prevention of neonatal GBS diseases have also been issued and adopted, with the expected impact on incidence of GBS-EOD. In spite of universal screening, in spite of the great progress that has been made, GBS-EOD continues to occur and the GBS burden remains a significant public health issue. Continuous efforts to improve screening for GBS status continue to be important and may be able to take advantage of new rapid diagnostic technologies. The current screening-based strategy for prevention is highly effective but imperfect. Given the challenges, limitations and potential complications of maternal intrapartum prophylaxis, a new approach is still needed. Maternal immunization against GBS is an attractive alternative for the prevention of not only neonatal diseases but also stillbirths and maternal diseases. Vaccines against GBS may likely become the most effective and sustainable long-term preventive strategy. [less ▲]

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See detailFormulation of Kinematic Joints and Rigidity Constraints in Multibody Dynamics using a Lie Group Approach
Sonneville, Valentin ULg; Bruls, Olivier ULg

in Proceedings of the 2nd Joint International Conference on Multibody System Dynamics (IMSD) (2012, May)

The matrix Lie group approach allows to formulate and solve the equations of motion of a multibody system in a parametrization-free framework. The kinematic joints and the rigidity constraints should also ... [more ▼]

The matrix Lie group approach allows to formulate and solve the equations of motion of a multibody system in a parametrization-free framework. The kinematic joints and the rigidity constraints should also be formulated as constraint equations on the Lie group. Working on the Special Euclidean group SE(3), we introduce a method to obtain appropriate vectorial constraint equations in terms of mixed coordinates. Moreover, we present an absolute coordinates formulation, based on an relative coordinates elimination method, so that the minimum number of constraint equations necessary to describe the joints is used. [less ▲]

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See detailOn the Dynamics of Locators in LISP
Saucez, Damien; Donnet, Benoît ULg

in IFIP/TC6 Networking (2012, May)

In the Internet, IP addresses play the dual role of identifying the hosts and locating them on the topology. This design choice limits the way a network can control its traffic and causes scalability ... [more ▼]

In the Internet, IP addresses play the dual role of identifying the hosts and locating them on the topology. This design choice limits the way a network can control its traffic and causes scalability issues. To overcome this limitation, the Locator/Identifier Separation Protocol (LISP) has been introduced. In LISP, the addresses used to identify end hosts (i.e., identifiers) are independent of the addresses used to locate them (i.e., locators). LISP maps identifiers into a list of locators and provides a mean to transport the packets with the appropriate locator. A key feature of this separation is that several locators can be associated to a given identifier, leading to more control for an end-site on the path selection to reach a given destination. In this paper, we show that the choice of the locator can have an impact on the performance and the reliability of the communication in a LISP environment. To this aim, we build a mapping between identifiers and locators as if LISP were deployed today. In addition, we extensively collect delay data between locators and demonstrate that the locator selection for a given identifier prefix impacts the performance of the LISP path in 25% of the cases. Finally, we measure the locators availability over time and demonstrate that it remains quite stable. [less ▲]

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See detailModelling of solar thermo-chemical system for energy storage in buildings
Skrylnyk, Alexandre; Courbon, Emilie; Frère, Marc et al

in Proceedings of Innostock 2012 - The 12th International Conference on Energy Storage - 16th to 18 th May 2012 (2012, May)

The goal of this paper is the demonstration of the methodological design principles within theoretical modelling of thermal heat storage apparatus and simulation of inter-seasonal heat storage system. The ... [more ▼]

The goal of this paper is the demonstration of the methodological design principles within theoretical modelling of thermal heat storage apparatus and simulation of inter-seasonal heat storage system. The designing procedure starts from the modelling of thermal plant behaviour, based on the simplifications in the basic hypothesis. Afterwards, a more detailed modelling, involving dynamic aspects and additional features of plant components, is presented. The accomplishment of the designing procedure follows by the optimisation of key parameters of the thermal storage plant. [less ▲]

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See detailReconstruction of a Human Mitochondrial Complex I Mutation in the Green Microalga Chlamydomonas
Remacle, Claire ULg

in Mitochondria in life, death and disease (2012, May)

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See detailGénéralisation min max pour l'apprentissage par renforcement batch et déterministe : schémas de relaxation
Fonteneau, Raphaël ULg; Ernst, Damien ULg; Boigelot, Bernard ULg et al

in Septièmes Journées Francophones de Planification, Décision et Apprentissage pour la conduite de systèmes (JFPDA 2012) (2012, May)

On s’intéresse au problème de généralisation min max dans le cadre de l’apprentissage par renforcement batch et déterministe. Le problème a été originellement introduit par Fonteneau et al. (2011). Dans ... [more ▼]

On s’intéresse au problème de généralisation min max dans le cadre de l’apprentissage par renforcement batch et déterministe. Le problème a été originellement introduit par Fonteneau et al. (2011). Dans un premier temps, on montre que le problème est NP-dur. Dans le cas où l’horizon d’optimisation vaut 2, on développe deux schémas de relaxation. Le premier schéma fonctionne en éliminant des contraintes de telle sorte qu’on obtienne un problème soluble en temps polynomial. Le deuxième schéma est une relaxation Lagrangienne conduisant à un problème conique-quadratique. On montre théoriquement et empiriquement que ces deux schémas permettent d’obtenir de meilleurs résultats que ceux proposés par Fonteneau et al. (2011). [less ▲]

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See detailThe pilot study on clinical presentation of pituitary adenomas in patients with multiple endocrine neoplasia type I (MEN1) phenotype with and without MEN1 mutation
Rostomyan, Liliya ULg; TICHOMIROWA, M; KIRDYANKINA, N et al

in Endocrine abstracts - May 2012, volume 29 (2012, May)

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See detailINFLUENCE DE LA MÉTHODE CEREKI SUR LE NIVEAU D’ACCOUTUMANCE À L’EAU
Jidovtseff, Boris ULg; Vandermeulen, Mary; Schiettecatte, Delphine et al

in Abstract book de la 7ème Biennale de l'Association pour la Recherche en Intervention en Sport (ARIS) (2012, May)

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See detailLe touriste à la ferme : de la thématisation au simulacre ?
Dubois, Charline ULg; Schmitz, Serge ULg

in Rendez-vous Champlain sur le Tourisme, l'expérience touristique : ULB, Bruxelles 21-23 mai 2012 (2012, May)

Vivre avec l’agriculteur, passer un bon moment en famille, se ressourcer dans la nature, retrouver ses racines, déguster les produits qui font la tradition et la fierté de la région visitée, ce sont là à ... [more ▼]

Vivre avec l’agriculteur, passer un bon moment en famille, se ressourcer dans la nature, retrouver ses racines, déguster les produits qui font la tradition et la fierté de la région visitée, ce sont là à la fois différents produits d’appel orchestrés par le secteur de l’agritourisme et des représentations fréquentes de cette activité dans la population. Si les définitions et les pratiques de l’agritourisme sont multiples, les représentations peuvent différer selon les relations des personnes avec le monde agricole. Or la réussite d’un produit touristique dépend d’une rencontre entre les attentes des touristes et l’offre. Cet article analyse les composantes, induite, organique et modifiée par l’expérience, de l’image de l’agritourisme. L’analyse se base sur des données récoltées lors d’enquêtes et interviews de terrain en Wallonie et au Grand-Duché de Luxembourg : 230 enquêtes effectuées dans des pôles touristiques et 26 récits de vie de tenanciers. A travers une comparaison des représentations de l’agritourisme auprès de trois groupes d’individus – celles des touristes ayant vécu l’agritourisme ou habitant l’espace rural, celles des touristes n’ayant jamais expérimenté l’agritourisme et celles des tenanciers –, la communication souligne les attentes, les divergences, les incompréhensions de l’agritourisme. Les niveaux d’attentes des touristes en matière d’accueil, d’authenticité, de confort et de participation aux travaux de la ferme sont souvent contradictoires et parfois en contradiction avec l’offre et l’activité agricole. [less ▲]

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See detailLimit cycling behavior of a hybrid system: Application to percussive drilling
Depouhon, Alexandre ULg; Detournay, Emmanuel; Denoël, Vincent ULg

in Proceedings of the 2nd International Colloquium on Non-Linear Dynamics and Control of Deep Drilling Systems, Eindhoven, May 2012 (2012, May)

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See detail"Latinum est : non legitur". Lire le latin et traduire le latin en grec en Orient
Rochette, Bruno ULg

in Scrivere e leggere nell'Alto Medioevo (2012, May)

Detailed reference viewed: 59 (0 ULg)
See detailSearch for biomarkers of canine IPF
Clercx, Cécile ULg

in Proceedings of the Meeting on idiopathic pulmonary fibrosis in dogs and humans - Viikki campus, Helsinki - 22sd May 2012 (2012, May)

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See detailAry Hydrocarbon receptor interacting protein (AIP) on somatotroph adenomas : a molecular target for somatostatin analogues ?
JAFFRAIN-REA, M; ANGELINI, M; OCCHI, G et al

in Endocrine abstracts - May 2012, volume 29 (2012, May)

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See detailUse of medium without reducing agent for in vitro fermentation studies by bacteria isolated from pig intestine
POELAERT, Christine ULg; Boudry, Christelle ULg; Portetelle, Daniel ULg et al

in XII International Symposium on Digestive Physiology of Pigs (2012, May)

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See detailUse of graphical modality in a collaborative design distant setting
Safin, Stéphane ULg; Juchmes, Roland ULg; Leclercq, Pierre ULg

in Dugdale, Julie; Masclet, Cédric; Grasso, Maria Antonietta (Eds.) et al Proceedings of COOP 2012 : 10th International Conference on the Design of Cooperative Systems (2012, May)

In this chapter, we are interested in studying the use of the graphical modality (digital sketch and document annotations) as a tool for collective design and remote communication. This study takes place ... [more ▼]

In this chapter, we are interested in studying the use of the graphical modality (digital sketch and document annotations) as a tool for collective design and remote communication. This study takes place in the framework of a 3 months long collaborative architectural design studio, gathering students from Belgium and France to remotely work together in 3 small groups. The study focuses on the role of the graphical modality inside synchronous remote meetings supported by the Distributed Collaborative Design Studio (DCDS). The DCDS enables multi- modal real-time remote exchanges, and aims at remotely re-creating the conditions of co-present meetings. This environment associates a videoconference tool (sup- porting verbal and non-verbal communication) and an original real-time shared digital hand-drawn sketches system (supporting graphical communication). We identify the types of digital annotations made on the imported document (thanks to the electronic pen), as well as their role in the cognitive design processes and in the collaborative and communication processes. We also identify the different practices of digital sketching, in regard to each group and its collaborative strate- gies. We discuss the utility of the graphical modality as an efficient support for collaborative synchronous activities and show that the DCDS environment sup- ports different strategies of collaborative design (co-design and distributed de- sign). We conclude on recommendations for improving the system and for design- ing sketch-based collaborative environments. [less ▲]

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See detailTheban Tomb Graffiti during the New Kingdom: Research on the Reception of Ancient Egyptian Images by Ancient Egyptians.
Den Doncker, Alexis ULg

in Kóthay, K. A. (Ed.) Art and Society. Ancient and Modern Contexts of Egyptian Art. Proceedings of the International Conference held at the Museum of Fine Arts, Budapest, 13-15 May 2010. (2012, May)

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See detailHydraulic modelling of Piano Key Weirs: a composite approach
Erpicum, Sébastien ULg; Machiels, Olivier ULg; Archambeau, Pierre ULg et al

in Proceedings of International workshop on Piano Key Weir for In-stream Storage and Dam Safety - PKWISD-2012 (2012, May)

During the last few years, several piano key weirs (PKWs) have been built in France and abroad. Thanks to the reduced footprint and high release capacities of this new type of weir, making it particularly ... [more ▼]

During the last few years, several piano key weirs (PKWs) have been built in France and abroad. Thanks to the reduced footprint and high release capacities of this new type of weir, making it particularly suited for concrete dams rehabilitation, lots of other projects in various countries are under construction or study. The prototype use of PKW requires knowledge about its structural behaviour, hydraulic capacities as well as integration into dams’ environment. This paper aims at presenting numerical and physical modelling works performed at the University of Liege to address the last two items. In particular, large scale physical modelling and parametric scale models have enabled to understand the hydraulic behaviour of the structure and to highlight its most influencing geometric parameters as well as their best variation interval depending on various criteria related to the weir design (discharge efficiency, cost…). A 1D numerical model has also been developed based on these experimental investigations. It enables to predict in a few minutes, with 10% accuracy, the discharge capacity of a given PKW geometry within its usual range of operation head. This model, available as a freeware from http://www.pk-weirs.ulg.ac.be, constitutes a key tool for the first design of such weirs. Finally, the scale model studies of major projects such as Raviège dam (France) for Electricité de France - EDF and Ouldjet Mellegue Project (Algeria) for Coyne et Bellier – Tractebel Engineering enable to confront theoretical predictions with experimental results and to address the problem of PKW integration on dam crests. [less ▲]

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See detailNew Standard Formulation for Neonatal Parenteral Nutrition.
SENTERRE, Thibault ULg

in Congress of the Portuguese Neonatal Society (2012, May)

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See detailCentimeter-scale secondary information on hydraulic conductivity using a hand-held air permeameter on borehole cores
Rogiers, Bart; Winters, P.; Huysmans, Marijke et al

in Geophysical Research Abstracts, Vol. 14, EGU2012-1794-1 (2012, May)

Saturated hydraulic conductivity (Ks) is one of the most important parameters determining groundwater flow and contaminant transport in both unsaturated and saturated porous media. Determining the small ... [more ▼]

Saturated hydraulic conductivity (Ks) is one of the most important parameters determining groundwater flow and contaminant transport in both unsaturated and saturated porous media. Determining the small-scale variability of this parameter is key to evaluate implications on effective parameters at the larger scale. Moreover, for stochastic simulations of groundwater flow and contaminant transport, accurate models on the spatial variability of Ks are very much needed. While several well-established laboratory methods exist for determining Ks, investigating the small-scale variability remains a challenge. If several tens to hundreds of metres of borehole core has to be hydraulically characterised at the centimetre to decimetre scale, several hundreds to thousands of Ks measurements are required, which makes it very costly and time-consuming should traditional methods be used. With reliable air permeameters becoming increasingly available from the late 80’s, a fast and effective indirect method exists to determine Ks. Therefore, the use of hand-held air permeameter measurements for determining very accurate small-scale heterogeneity about Ks is very appealing. Very little is known, however, on its applicability for borehole cores that typically carry a small sediment volume. Therefore, the method was tested on several borehole cores of different size, originating from the Campine basin, Northern Belgium. The studied sediments are of Miocene to Pleistocene age, with a marine to continental origin, and consist of sand to clayey sand with distinct clay lenses, resulting in a Ks range of 7 orders of magnitude. During previous studies, two samples were taken from borehole cores each two meters for performing constant head lab permeameter tests. This data is now used as a reference for the air permeameter measurements that are performed with a resolution of 5 centimetres. Preliminary results indicate a very good correlation between the previously gathered constant head Ks data and the air permeability measurements, but a systematic bias seems to exist. A geostatistical analysis with cross-validation is performed to assess the predictive uncertainty on Ks, using both types of data. We conclude that performing hand-held air permeameter measurements on undisturbed borehole cores provides a very cost-effective way to obtain very detailed information in the framework of stochastic simulation and conditioning of heterogeneous hydraulic conductivity fields. [less ▲]

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See detailActualités sur l'emploi du PRP dans les tendinopathies
Kaux, Jean-François ULg

in 31ème Séminaire AMDTS de Traumatologie du Sport (2012, May)

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See detailAir permeametry on outcrop analogues: a composite image of the Neogene aquifer, Belgium
Rogiers, Bart; Beerten, K.; Smekens, T. et al

in Geophysical Research Abstracts, Vol. 14, EGU2012-1788-1 (2012, May)

Saturated hydraulic conductivity (Ks) is one of the most important parameters determining groundwater flow and contaminant transport in both unsaturated and saturated porous media. While several well ... [more ▼]

Saturated hydraulic conductivity (Ks) is one of the most important parameters determining groundwater flow and contaminant transport in both unsaturated and saturated porous media. While several well-established laboratory methods exist for determining Ks, in-situ measurements of this parameter remain very complex. Since the 50’s, and increasingly from the late 80’s, air permeameters are being used effectively as an indirect method to determine Ks on outcrop sediments. In this paper, the heterogeneity within outcrop sediments that are analogues for the Neogene aquifer hydrostratigraphic units in northern Belgium is studied with a hand-held air permeameter. This aquifer, representing a major groundwater source, consists of several sandy geological units from Miocene to Pleistocene age with a marine to continental origin. Moreover, it plays an important role in the Belgian deep geological radwaste disposal studies, and is the subject of a safety assessment for a future low-level radwaste surface repository. To characterise the variability between and within the different lithostratigraphical aquifer units, 804 air permeability measurements at cm-scale were performed on several outcrops that are analogues for the sandy aquifer sediments and a highly heterogeneous aquitard. Equivalent meter-scale Ks tensors were calculated numerically through the law of flow conservation to obtain the vertical anisotropy factor. The off-diagonal tensor components were shown to be negligible. To validate the air permeametry data, 18 additional constant head permeameter tests on 100 cm3 cores and 27 grain size analyses based Ks assessments were performed on outcrop material. The comparison indicates that hand-held air permeameters are very effective and useful tools to characterise the magnitude of hydraulic conductivity, as well as it’s small-scale variability and anisotropy, on a broad range of sediment types. However, a comparison with data from a previous borehole campaign on similar though not identical aquifer sediments reveals that the Ks values predicted at the outcrops are systematically higher by at least a factor of 10 than the corresponding Ks distributions determined from the borehole cores. One explanation is the weathering state of several-cm thick clay lenses, i.e. much less weathered in the aquitard than in the analogous outcrop with correspondingly lower conductivities for the aquitard. This shows that transferring outcrop data to the subsurface should be done with care because of different degrees of compaction, weathering states, etc. [less ▲]

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See detailThe Stadium of Olympia, from the perspective of the dialogical architecture
Kiuri, Miranda ULg; Teller, Jacques ULg

in ‪International Workshop COAC Barcelona 2012 - Jornadas Cientificas COAC Barcelona 2012‪ (2012, May)

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See detailUML as a schema candidate for Graph databases
Delfosse, Vincent ULg; Billen, Roland ULg; Leclercq, Pierre ULg

in NoSql Matters 2012 (2012, May)

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See detailNeural networks for musical chords recognition
Osmalsky, Julien ULg; Embrechts, Jean-Jacques ULg; Van Droogenbroeck, Marc ULg et al

in Journées d'informatique musicale (2012, May)

In this paper, we consider the challenging problem of music recognition and present an effective machine learning based method using a feed-forward neural network for chord recognition. The method uses ... [more ▼]

In this paper, we consider the challenging problem of music recognition and present an effective machine learning based method using a feed-forward neural network for chord recognition. The method uses the known feature vector for automatic chord recognition called the Pitch Class Profile (PCP). Although the PCP vector only provides attributes corresponding to 12 semi-tone values, we show that it is adequate for chord recognition. Part of our work also relates to the design of a database of chords. Our database is primarily designed for chords typical of Western Europe music. In particular, we have built a large dataset filled with recorded guitar chords under different acquisition conditions (instruments, microphones, etc), but also with samples obtained with other instruments. Our experiments establish a twofold result: (1) the PCP is well suited for describing chords in a machine learning context, and (2) the algorithm is also capable to recognize chords played with other instruments, even unknown from the training phase. [less ▲]

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See detailla dépression maternelle en post-partum: actualisation et points pratiques
Battisti, Oreste ULg; Emonts, Patrick ULg

in colloque de l'EPU-Ulg (2012, May)

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See detailA prospective study of cardiac valvular status in patients treated with cabergoline for Endocrine Disease
VROONEN, Laurent ULg; LANCELLOTTI, Patrizio ULg; TOME, M et al

in Endocrine abstracts - May 2012, volume 29 (2012, May)

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See detailDigital Holographic Interferometry and ESPI at Long Infrared Wavelengths with CO2 Laser (invited paper)
Georges, Marc ULg; Vandenrijt, Jean-François ULg; Thizy, Cédric ULg et al

in Digital Holography and 3D Imaging (DH2012) (2012, April 28)

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See detailLes contrats immobiliers. Le mandat, la loi Breyne
Kohl, Benoît ULg; Salzburger, Romain ULg

in Leleu, Yves-Henri (Ed.) Chroniques Notariales (2012, April 26)

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See detailComputational Considerations for the Prediction of Stall Flutter
Watrin, Damien ULg; Dimitriadis, Grigorios ULg; Perry, Tristan et al

in Proceedings of the 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (2012, April 25)

A solver has been developed within the OpenFoam framework to compute large amplitude motion of two-dimensional rigid configurations. The results obtained with this code were successfully validated on ... [more ▼]

A solver has been developed within the OpenFoam framework to compute large amplitude motion of two-dimensional rigid configurations. The results obtained with this code were successfully validated on rigid airfoils at static and dynamic conditions, as well as correlated with experimental data and numerical solutions from similar unsteady solvers. The results demonstrated that while current computational methods are able to predict the self-sustained oscillations characterizing a pitch-dominated stall flutter, including energy transfer, improvements are needed. The influence of grid, temporal integration, turbulence modeling, and flow equations is examined for the stall flutter starting solution of dynamic stall. [less ▲]

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See detailA Cross-Validation Approach to Approximate Basis Function Selection of the Stall Flutter Response of a Rectangular Wing in a Wind Tunnel
Kukreja, Sunil L.; Vio, Gareth A.; Andrianne, Thomas ULg et al

in Proceedings of the 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (2012, April 25)

The stall flutter response of a rectangular wing in a low speed wind tunnel is modelled using a nonlinear difference equation description. Static and dynamic tests are used to select a suitable model ... [more ▼]

The stall flutter response of a rectangular wing in a low speed wind tunnel is modelled using a nonlinear difference equation description. Static and dynamic tests are used to select a suitable model structure and basis function. Bifurcation criteria such as the Hopf condition and vibration amplitude variation with airspeed were used to ensure the model was representative of experimentally measured stall flutter phenomena. Dynamic test data were used to estimate model parameters and estimate an approximate basis function. [less ▲]

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See detailSupervised learning to tune simulated annealing for in silico protein structure prediction
Marcos Alvarez, Alejandro ULg; Maes, Francis ULg; Wehenkel, Louis ULg

in Verleysen, Michel (Ed.) ESANN 2012 proceedings, 20th European Symposium on Artificial Neural Networks, Computational Intelligence and Machine Learning (2012, April 25)

Simulated annealing is a widely used stochastic optimization algorithm whose efficiency essentially depends on the proposal distribu- tion used to generate the next search state at each step. We propose ... [more ▼]

Simulated annealing is a widely used stochastic optimization algorithm whose efficiency essentially depends on the proposal distribu- tion used to generate the next search state at each step. We propose to adapt this distribution to a family of parametric optimization problems by using supervised machine learning on a sample of search states derived from a set of typical runs of the algorithm over this family. We apply this idea in the context of in silico protein structure prediction. [less ▲]

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See detailExperiments on a pitch-plunge wing undergoing limit cycle oscillation
Norizham, Abdul Razak ULg; Rothkegel Ide, José Ignacio ULg; Dimitriadis, Grigorios ULg

in Proceedings of the 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (2012, April 25)

The aeroelastic behaviour of a wing oscillating in the heave and pitch degrees of freedom is examined by means of wind tunnel experiment. The phenomena of interest are classical flutter and limit cycle ... [more ▼]

The aeroelastic behaviour of a wing oscillating in the heave and pitch degrees of freedom is examined by means of wind tunnel experiment. The phenomena of interest are classical flutter and limit cycle oscillation. Classical flutter is normally associated with the exponential growth of the response amplitude. Linear flutter theory only predicts the critical flutter speed. Any excitation or disturbance beyond the critical speed is assumed to cause exponential growth in the response amplitude. In contrast, any limited amplitude oscillations occurring post-fultter suggest the existence of nonlinear properties in the system. Such properties can originate from the aerodynamic forces in the form of flow separation and reattachment. On the structural side, damping and stiffness can also contribute nonlinear properties. Furthermore, these nonlinearities can manifest themselves even at pre-flutter conditions, depending on the values of some governing parameter. The focus of the present work is the transformation of classical flutter into stall flutter as the equilibrium angle of attack of heaving and pitching wing is increased. The interaction of stall-related nonlinearity with structural nonlinearities is also of interest. The measured aeroelastic responses are analyzed and the bifurcation behavior of the dynamic system is characterized. Structural responses as well as flow field visualization through Particle Image Velocimetry show the origin of nonlinearity does not solely come from the manifestation of separation and the shedding of vortices, but from the structural nonlinearity which limits the response amplitude. [less ▲]

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See detailInitial Investigation of Chordwise Flexible Flat Aerofoil
Vio, Gareth A.; Worotynska, Jagoda; Berci, Marco et al

in Proceedings of the 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (2012, April 25)

The size of small Unmanned Air Vehicles (UAVs) makes them susceptible to gusts, hence an evaluation of their aeroelastic performance is a necessary requirement. With advances in materials, new aircraft ... [more ▼]

The size of small Unmanned Air Vehicles (UAVs) makes them susceptible to gusts, hence an evaluation of their aeroelastic performance is a necessary requirement. With advances in materials, new aircraft are ever lighter and more flexible, both in the span-wise and chord-wise direction. An experiment is set up to evaluate the aeroelastic performance of a 2D chord-wise aerofoil structure under gust loading, where the wing of a small Unmanned Air Vehicle (UAV) is considered by coupling a Finite Element (FE) structural model with a Doublet-Lattice Method (DLM) aerodynamic model; a new semi-analytical modelling approach is also described. The flexible aerofoil structure is then optimised by means of a genetic algorithm (GA) framework for the minimum weight, subject to aeroelastic constraints of flutter, divergence and structural displacement. [less ▲]

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See detailDiscrete Vortex Simulations of the torsional flutter oscillations of a 4:1 rectangular cylinder
Andrianne, Thomas ULg; Dimitriadis, Grigorios ULg

in Proceedings of the 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (2012, April 24)

This work presents aeroelastic simulations of a 2D bluff-body around its pitching degree of freedom. The numerical tool consists in an aerodynamic solver based on the Discrete Vortex Method (DVM), coupled ... [more ▼]

This work presents aeroelastic simulations of a 2D bluff-body around its pitching degree of freedom. The numerical tool consists in an aerodynamic solver based on the Discrete Vortex Method (DVM), coupled with a linear structural model. The shape of the bluff-body is a sharp edged rectangular cylinder with a side ratio equal to 4. The numerical results are compared to the experimental measurements recently obtained by the authors.8 The validation is carried out in three steps: first the frequency content of the flow-field in the wake of the static body is investigated. Then the simulated unsteady flow-field around the imposed pitching motion of the body is compared to experimental flow visualizations. This comparison is performed using Proper Orthogonal Decomposition (POD). Finally, the simulation of the global aeroelastic behaviour, based on the coupling of the DVM code to the structural model of the pitching degree of freedom is carried out and the results are compared to measured aeroelastic responses.. Very good agreements are found between numerical and experimental results, demonstrating the capabilities of the numerical tool to simulate complex unsteady aerodynamics around an oscillating bluff-body. [less ▲]

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See detailÉtalonnage dynamique des capteurs piézoélectriques pour la mesure de haute pression balistique
Elkarous, Lamine ULg; Pirlot, Marc; Golinval, Jean-Claude ULg

in 4ème Conférence Internationale de métrologie - CAFMET2012 (2012, April 24)

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See detailComputational Identification of Non-Linear Damping in an Aeroelastic System
Vio, Gareth A.; Dimitriadis, Grigorios ULg

in Proceedings of the 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (2012, April 23)

An energy-based method is proposed to identify damping parameters from time histories of responses to sets of single-frequency harmonic excitation. The method is intended to be practically applicable to ... [more ▼]

An energy-based method is proposed to identify damping parameters from time histories of responses to sets of single-frequency harmonic excitation. The method is intended to be practically applicable to real structures and is able to identify the value of viscous damping, Coulomb friction and eventually other forms of non-linear damping models in aeroelastic systems. The inputs required are simply the accelerometer signals and the forces applied. It will be shown that if the system is undergoing Limit Cycle Oscillations, no external force is required for the identification process. [less ▲]

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See detailCarrier and aberrations removal in interferometric fringe projection profilometry
Blain, Pascal ULg; Michel, Fabrice; Renotte, Yvon ULg et al

in Gorecki, Christophe; Asundi, Anand K.; Osten, Wolfgang (Eds.) Optical Micro- and Nanometrology IV (SPIE proceedings vol.8430) (2012, April 17)

A profilometer which takes advantage of polarization states splitting technique and monochromatic light projection method as a way to overcome ambient lighting for in-situ measurement is under development ... [more ▼]

A profilometer which takes advantage of polarization states splitting technique and monochromatic light projection method as a way to overcome ambient lighting for in-situ measurement is under development [1, 2]. Because of the Savart plate which refracts two out of axis beams, the device suffers from aberrations (mostly coma and astigmatism). These aberrations affect the quality of the sinusoidal fringe pattern. In fringe projection profilometry, the unwrapped phase distribution map contains the sum of the object’s shape-related phase and carrier-fringe-related phase. In order to extract the 3D shape of the object, the carrier phase has to be removed [3, 4]. An easy way to remove both the fringe carrier and the aberrations of the optical system is to measure the phases of the test object and to measure the phase of a reference plane with the same set up and to subtract both phase maps. This time consuming technique is suitable for laboratory but not for industry. We propose a method to numerically remove both the fringe carrier and the aberrations. A first reference phase of a calibration plane is evaluated knowing the position of the different elements in the set up and the orientation of the fringes. Then a fitting of the phase map by Zernike polynomials is computed [5]. As the triangulation parameters are known during the calibration, the computation of Zernike coefficients has only to be made once. The wavefront error can be adjusted by a scale factor which depends on the position of the test object. [less ▲]

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See detailTHE RESPONSE OF ACETOBACTER SENEGALENSIS TO STRESSORS: A STUDY TOWARDS IMPROVEMENT OF VINEGAR STARTER PRODUCTION
Shafiei, Rasoul ULg; Thonart, Philippe ULg

in THE RESPONSE OF ACETOBACTER SENEGALENSIS TO STRESSORS: A STUDY TOWARDS IMPROVEMENT OF VINEGAR STARTER PRODUCTION (2012, April 17)

Acetic acid bacteria encounter various harsh conditions during acetic acid fermentation. Ethanol as the main substrate and acetic acid as the major product at low pH can influence deeply on the cellular ... [more ▼]

Acetic acid bacteria encounter various harsh conditions during acetic acid fermentation. Ethanol as the main substrate and acetic acid as the major product at low pH can influence deeply on the cellular functions of acetic acid bacteria. In previous studies in CWBI, Acetobacter senegalensis was used for production of dried vinegar starters; however the impact of stressors (ethanol and acetic acid) on A. senegalensis remained unclear. In this study, different techniques such as flow cytometry, culturability on solid medium and 2-DiGE were used comparatively to investigate the effect of carbon sources of inoculum media on the tolerance of A. senegalensis to stressors. Analysis of respiration system by flow cytometric methods showed that the presence of 2% (v/v) acetic acid in inoculum medium, in one hand, causes 80% of cells to continue to do respiration after a sudden exposure to 1- 3% (v/v) acetic acid in stress media while 89.7% of cells grown in glucose appeared as dead cells after an abrupt exposure to 3%(v/v) of acetic acid. On the other hand, 59.2% and 49.33% of cells grown in the presence of 2% (v/v) of acetic acid could maintain their entire membrane integrity after exposure to 1% and 3% (v/v) of acetic acid, respectively. Inoculum medium contained 5% (v/v) of ethanol as a carbon source enabled about 90% of cells to keep their growing capacities after a sudden exposure to 3% acetic acid. In contrast, just 40% of cells grown in glucose as a carbon source maintained their culturability on solid medium after exposure to 1% acetic acid. A similar profile of culturability was observed for the cells grown in 5% (v/v) ethanol or 2% (v/v) of acetic acid. A proteomic approach (2-DiGE) was used to analyze proteins expressed in the presence of different carbon sources. Differentially expressed proteins were mainly associated with energy metabolism, carbohydrate metabolisms, folding, sorting and degradation processes. The relative abundance of proteins was extensively different for cell grown in glucose compared with protein contents of cells grown in ethanol or acetic acid. In conclusion, production of a cost effective vinegar starter needs a qualified biomass which tolerates ethanol and acetic acid. Tolerance of A. senegalensis to acetic acid depends to a great extent on the composition of the medium which cells grow in. In spite of low adaption to acetic acid for cell grown in glucose, using ethanol or acetic acid in inoculum media renders a physiological state in A. senegelensis which enables it to cope with higher concentration of acetic acid readily, this biomass has a potential to be used as a starter. [less ▲]

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See detailCoupling Cell Mechanics and Intracellular Signalling: Mechanotransduction through ERK
Kerkhofs, Johan ULg; Geris, Liesbet ULg; Bosmans, Bart et al

in Middleton, John (Ed.) The Proceedings of the 10th International Symposium on Computer Methods in Biomechanics and Biomedical Engineering. Hotel Berlin, Berlin, Germany, April 7th – 11th, 2012 pages:0-0 (2012, April 12)

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See detailOptimisation 3D du chargement de conteneurs pour le transport aérien
Paquay, Célia ULg; Limbourg, Sabine ULg; Schyns, Michael ULg

in LigéRO (Ed.) Proceedings ROADEF 2013 (2012, April 11)

De nos jours, décider comment remplir des conteneurs avec des colis est une activité courante aussi bien dans le domaine du transport routier qu’aérien. Ce type de question est apparentée aux problèmes de ... [more ▼]

De nos jours, décider comment remplir des conteneurs avec des colis est une activité courante aussi bien dans le domaine du transport routier qu’aérien. Ce type de question est apparentée aux problèmes de Bin-Packing(BPP) en recherche opérationnelle. En termes économiques, ces opérations doivent mener à une solution qui satisfait de nombreuses contraintes physiques, être réalisées rapidement et de sorte à maximiser certains critères. Typiquement, on tentera de charger un maximum de colis dans un minimum de conteneurs pour réduire les coûts. [less ▲]

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