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See detailThe spatial footprint of the non-ferrous mining industry of Lubumbashi
Vranken, Isabelle ULg; Munyemba, François K.; Amisi, Mwana Y.

Conference (2013, September 06)

In the south-eastern part of the Katanga Province (Democratic Republic of the Congo), high concentrations of copper and cobalt are found in the soils of the well-known “Copper Belt”. Industrial mining and ... [more ▼]

In the south-eastern part of the Katanga Province (Democratic Republic of the Congo), high concentrations of copper and cobalt are found in the soils of the well-known “Copper Belt”. Industrial mining and smelting plants were installed under Belgian colonialism in the area and numerous other international companies have settled there since the end of the 1990s. Due to dominant south-eastern winds, the metallurgic industry in Lubumbashi has been the source of spatially concentrated atmospheric deposits of non ferrous metal particles and associated substances in a cone-shaped zone, situated north-west of the original metal processing site. Though an empiric effect on vegetation had been noticed for decades, it had not been highlighted yet until recently that this was due to the metallurgic activity. The metal processing plant has dramatically reduced its activity after the independence, in 1960, but the results of the colonial period and current activity are still visible today. The existence of this pollution cone has then been evidenced using two different techniques. Firstly, landscape metric comparisons of the vegetation and bare soil patterns in two study areas, one inside the pollution cone and one outside, have been applied on basis of a classified Quickbird satellite image (2005). Secondly, the city perception theory developed by Kevin Lynch has been used and adapted to the pollution issue and the context of developing countries, using trained experts and interviewed citizens. The first method highlighted a higher fragmentation and lower vegetation presence inside the pollution cone, reflecting the negative impact of the atmospheric deposits. Those differences were higher for sites closer to the emission source. Lynch’s approach outlined the negative impact of diverse industrial plants on the perception by the local population. Six pollution districts and several contaminated paths, limits, nodes and polluting landmarks were identified. Those included the recently installed plants to the north and east of the city. Citizens even recognize them as part of the collective image of the city. This has important outcomes, as the demographic pressure in Lubumbashi extended the city limits so that the metal processing plant is now fully included in the urban matrix. Therefore, a part of the local population lives within the pollution cone and faces contamination. Moreover, the rivers flowing near the plant, Kafubu and Lubumbashi, as well as the roads and railways linking different industrial sites are contaminated and represent contamination paths potentially spreading toxic substances all over the area. Sanitary evidences of this contamination have already been found in the area and particularly the pollution cone. Moreover, the recently installed plants, outside of the city, could face the same problems due to urban sprawl in the forthcoming years. This should be taken into account for the urban planning in Lubumbashi. Evidencing the ecological footprint of the non-ferrous mining industry is considered crucial to confront local decision makers with the negative impact of metallurgic industry within an urban context. [less ▲]

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See detailWorkshop "Non-compliance to the rules and disobedience towards the law"
Lejeune, Aude ULg; García Villegas, Mauricio

Conference (2013, September 06)

Acts of disobedience are increasing today. Dissident behaviors express new types of political commitment and mobilization. Madrid indignant protesters, Arab Spring, Occupy Wall Street are some ... [more ▼]

Acts of disobedience are increasing today. Dissident behaviors express new types of political commitment and mobilization. Madrid indignant protesters, Arab Spring, Occupy Wall Street are some manifestations of this phenomenon. Beside collective movements, other conducts of disobedience are less visible, but equally important; for instance, when a citizen refuses to pay taxes or do not comply with traffic rules or refuses to participate in the election when vote is compulsory. These ordinary conducts are also part of the contestation of social norms and order. In non-democratic or in transition to democracy countries, scholarly works have highlighted how complex the phenomenon of non-compliance with rules is. They have showed the existence of a culture of non-compliance, linked not only to the problem of national State legitimacy but similarly to the influence of other normative orders, such as tradition or religion. Disobedient citizens experience a tension between, on the one side, what they consider as the moral norms or customary rules, and, on the other side, the current legal norms. How these plural normative orders are connected one to each other and how they affect the rule of law and the democratic regimes? Through this workshop, we want to examine how citizens experience the law and the rules in different social and political settings. Crossing different approaches – Sociology, Political science, Law, and Anthropology – allows us to analyze both organized and collective behaviors of disobedience, such as destroying GMO crops or commercial billboards, as well as ordinary and individual conducts of non-compliance to the rules, such as cheating during an exam or breaking the traffic laws. These different forms of disobedience and non-compliance invite us to think about the articulation between individual and collective behaviors (to the extent that each conduct of non-compliance is embedded in a larger social context and contributes, in return, to shape it) and between political and self-interested acts of resistance. The phenomenon of non-compliance to the rules can be analyzed from two perspectives: one, from the point of view of the actor (individual or collective) who are involved; the other from the purposes of action (interest-oriented or value-oriented). By crossing these two focuses, four practices of disobedience can be distinguished: (1) the non-compliance by an individual, as a selfish and interested practice, for example when a driver jumps the lights or when a citizen does not pay taxes; (2) the non-compliance by an individual who thinks the norm is unjust or immoral, for example when a physician does not follow the law in the case of abortion; (3) the non-compliance by a group in order to fulfill its interests, for example the gas smuggling practices on the border between two countries and; (4) the non-compliance by a group on behalf of shared values, for example indignant protesters. These different forms of disobedience and non-compliance to the norms allow us to analyze dissident legal mobilizations and highlight activities which differ from conventional political protestation. Through these questions, we suggest more broadly to examine how ordinary citizens experience the law and the legality and which cultures of legality are constructed in different social and political contexts. In short, the comparative analysis of disobedience practices allows us to think about the relationship between legality and legitimacy and between the law and other normative orders. [less ▲]

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See detailUsing the Pic-Nic Game in a qualitative research about divorced families.
Bullens, Quentin ULg

Conference (2013, September 06)

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See detailA probabilistic characterization, propagation, and sensitivity analysis of uncertainties in a metal forming application
Arnst, Maarten ULg; Ponthot, Jean-Philippe ULg

Conference (2013, September 05)

In metal forming processes, after leaving the tooling, formed pieces of metal have a tendency to partially return to their original shape because of their elastic recovery. This phenomenon, referred to as ... [more ▼]

In metal forming processes, after leaving the tooling, formed pieces of metal have a tendency to partially return to their original shape because of their elastic recovery. This phenomenon, referred to as the springback, is quite complex and depends not only on material properties such as Young's modulus and yield stress but also on many process parameters such as sheet thickness and bending angles. The springback is difficult to predict and is a major quality concern in forming processes because when the springback is smaller or larger than expected, it can cause serious problems to subsequent assembly processes due to geometry mismatches. In this communication, we present a probabilistic analysis of a metal forming application. We consider the bending of a metal sheet with uncertain elastoplastic material properties. First, we use methods from mathematical statistics to obtain a probabilistic characterization of the elastoplastic material properties from data. Next, we map this probabilistic representation of the elastoplastic material properties into a probabilistic representation of the deformed shape of the metal sheet through a mechanical model implemented using the Metafor software. Finally, we conduct a stochastic sensitivity analysis to determine which elastoplastic material properties are most influential in driving uncertainty in the deformed shape after the springback. Our probabilistic analysis involves so called nonintrusive methods, that is, methods that can be implemented as wrappers around the Metafor software without requiring modification of its source code. Further, it includes recent methods for the propagation and sensitivity analysis of uncertainties characterized by arbitrary probability distributions that may exhibit statistical dependence. [less ▲]

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See detailCareer Patterns in Multi-level Systems. A Survival Analysis of Political Careers in Catalonia, Quebec, Scotland, and Wallonia.
Dodeigne, Jérémy ULg

Conference (2013, September 05)

With the process of regionalisation in formerly unitary democracies, there is a renewed interest for conceptual and empirical studies on political careers. Not only in new federal political systems, but ... [more ▼]

With the process of regionalisation in formerly unitary democracies, there is a renewed interest for conceptual and empirical studies on political careers. Not only in new federal political systems, but also in established federations. Yet, critical questions remain unsolved on both methodological and empirical aspects. This proposal seeks to provide original answers based on a comparative analysis of four regions from established and new federal systems: Catalonia in Spain, Quebec in Canada, Scotland in the UK and Wallonia in Belgium. The paper proceeds in two stages. From a methodological view, even though current research analyse individual trajectories, they do not take individual careers but predominantly inter-territorial movements as the unit of analysis. This paper demonstrates that an individual approach – following every single trajectory over time and across territories – is a better unit of analysis to uncover all career patterns. Based on a “survival analysis” of 2.443 careers, a quantitative analysis tests several hypotheses to explain the variations in career patterns across regions. Two covariates of interest are more particularly tested: the effect of former regional/national experience on political career; the differences of survival rates at the regional and national levels between regionalist and national parties. [less ▲]

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See detailRenewal of Walloon suburban neighbourhoods
Marique, Anne-Françoise ULg

Conference (2013, September 05)

This paper addresses the challenges, transformations and conditions of a sustainable suburban transition in Wallonia (Belgium). Two powerful levers are used: (1) urban form, which is considered in ... [more ▼]

This paper addresses the challenges, transformations and conditions of a sustainable suburban transition in Wallonia (Belgium). Two powerful levers are used: (1) urban form, which is considered in addition to the individual building scale, and (2) mobility, because sprawl spatially separates activities, resulting in an increase in travel distances and energy used in transportation. Three scenarios focused on the evolution of the existing building stock are modelled and assessed (the retrofitting of existing neighbourhoods, an increase in the built density and demolition / reconstruction) to answer two main questions: "how to intervene in suburban areas?" and" where to intervene? ". [less ▲]

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See detailStructural characterization of disulfide-bridged-peptides by a combined use of ETD, CID and Ion-Mobility mass spectrometry
Massonnet, Philippe ULg; Upert, Gregory; Pastor, Alexandra et al

Conference (2013, September 05)

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See detailExperimental Validation of a Thermal Model of a LOx Flooded Ball Bearing
Servais, Christophe ULg; Bozet, Jean-Luc ULg; Kreit, Patrick ULg et al

Conference (2013, September 05)

Ball bearings of turbopumps of rocket engines work in very singular conditions; they are flooded into liquid oxygen or liquid hydrogen. Therefore, the use of any conventional lubricants (oil or grease) is ... [more ▼]

Ball bearings of turbopumps of rocket engines work in very singular conditions; they are flooded into liquid oxygen or liquid hydrogen. Therefore, the use of any conventional lubricants (oil or grease) is proscribed. Although cryogenic fluids can cool this kind of ball bearing, they cannot separate the surfaces in contact. As a result, there is a significant increase in frictional power losses. This paper presents tests performed on a cryotechnic ball bearing flooded in liquid oxygen. The test results showed that beyond a critical loading of the bearing, a sudden increase in temperature occurred. A thermal model is also put forward, in order to understand and anticipate especially the thermal instability described above. [less ▲]

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See detailTowards a (New) Mode of Organizational Regulation in Belgian Schools? Some Empirical Accounts of Mediation Practices and Devices
Dubois, Christophe ULg; Dethier, Baptiste ULg

Conference (2013, September 04)

Considering mediation in general as a new mode of social regulation (Bonafé-Schmitt, 1996 ; Volckrick, 2005), we can consequently conceive school mediation as a new mode of organizational regulation ... [more ▼]

Considering mediation in general as a new mode of social regulation (Bonafé-Schmitt, 1996 ; Volckrick, 2005), we can consequently conceive school mediation as a new mode of organizational regulation (Reynaud, 1988; Friedberg, 1993). Nevertheless, it is necessary to account for the concrete practices and devices through which school mediation becomes visible and recovers a concrete social form (Simmel, 1999). In doing so, we will consider mediation as a set of concrete solutions designed to solve local problems. With this in mind, this presentation will precisely aim at reporting and depicting concrete school mediation situations, through a double movement of decomposition and re-composition (Latour, 2010) settled in an experimental research method. This study takes place in a doctoral research program introduced in 2011 (Kuty et al., 2012). It is based on fifty semi-directive individual interviews and sixteen collective interviews, led within six secondary schools in French-Speaking Belgium. [less ▲]

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See detailThe development of children's and preadolescent's narratives
Boulard, Aurore ULg; Poudat, Céline; Gauthier, Jean-Marie ULg

Conference (2013, September 04)

The aim of this study is to explore the development of children’s narratives in three different contexts that are favorable to the production of (self-)narratives: (i) at home with parent(s), (ii) at ... [more ▼]

The aim of this study is to explore the development of children’s narratives in three different contexts that are favorable to the production of (self-)narratives: (i) at home with parent(s), (ii) at school with peers and (iii) with a researcher in psychology. 136 children aged from 3 to 13 have been recorded 50 minutes in each situation. Once transcribed, the data were morphosyntactically annotated and processed using multivariate exploratory techniques, including Correspondence Analysis, Principal Component and Classification Analysis. The results we obtained first demonstrated that contextual indicators were more significant than age in narrative production: conversations with parents were significantly more interactive whereas interactions between children turned out to be more regressive (i.e. simplified vocabulary, demonstrative pronouns). The situation with the psychologist was the one leading to the more elaborate narratives, as children seem to show greater language control with unfamiliar adults. However, age naturally impacts the linguistic complexity of narratives, both on the lexical and morphosyntactic levels. The results we obtained enabled us to observe a gradation in the complexity of textual productions, setting the roots of the future self-narratives the subjects will be able to develop later, during adolescence. Thus, the findings show different and significant aspects of the development of narratives and self-narratives in children’s speech, considering age and context. Last but not least, they also suggest the relevance of the application of text statistics methods to clinical psychology. [less ▲]

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See detailPrison Governors as Middle-Managers and Policy Makers. Sociology of a Profession at the Heart of Prison Policy and Organisations
Dubois, Christophe ULg

Conference (2013, September 03)

Today, in the Belgian context, prison governors are working in organisations characterized by legislative and managerial reforms which are based on new discourses (NPM, Human Rights, Restorative justice ... [more ▼]

Today, in the Belgian context, prison governors are working in organisations characterized by legislative and managerial reforms which are based on new discourses (NPM, Human Rights, Restorative justice, Sustainable development, Risk management, etc.), new laws (2005 and 2007 prison acts) and new tools (KPI, Management plans, Balanced scoreboard, etc.). Rarely studied, prison governors can be seen as intermediary actors occupying both the highest hierarchical position at the organisational level and a subordinate one vis-à-vis the central administration (the Prison Service and its federal and regional directions). They also fulfil a role that makes them responsible for more than 11,000 inmates and 9,000 employees. While some experts write that prison policies are rare or non-existent (and Lascoumes Artières, 2004; Mary, 2006), how can we account for prison governance, emerging and largely informal, allowing Belgian prisons to run despite the internal and external tensions and pressures, coming from inmates, guards, civil and political society? This presentation is based on 60 semi-structured interviews conducted with prison governors (N=30) and various prison professionals (N=30). It aims at depicting governors’ concrete practices and interactions in order to account for their work as middle managers and policy makers. [less ▲]

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See detailOn the way to hybrid organizations? When worlds collide through collective entrepreneurship
Dufays, Frédéric ULg; Huybrechts, Benjamin ULg

Conference (2013, September 02)

This communication presents a model of collective entrepreneurship process, drawing on institutional theory (institutional logics) and on the sociology of social networks (structural hole). It argues that ... [more ▼]

This communication presents a model of collective entrepreneurship process, drawing on institutional theory (institutional logics) and on the sociology of social networks (structural hole). It argues that entrepreneurship might result from the association of bridge-builders, both in terms of structural hole bridging and in terms of institutional logics bridging. Individual as well as structural factors will influence the entrepreneurial outcome, in particular in the way the new organisation deals with the distinct logics. [less ▲]

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See detailConnecting the dots for social value: A review on social networks and social entrepreneurship
Dufays, Frédéric ULg; Huybrechts, Benjamin ULg

Conference (2013, September 02)

The emergence of social entrepreneurship has been explained at the macro-level (socioeconomic drivers), at the meso-level (concepts such as opportunity), and at the micro-level (motivations and intentions ... [more ▼]

The emergence of social entrepreneurship has been explained at the macro-level (socioeconomic drivers), at the meso-level (concepts such as opportunity), and at the micro-level (motivations and intentions of social entrepreneurs). In this conceptual article, we argue that the sociology of social networks may contribute to explain how and why social entrepreneurship arises by bridging micro- and macro-levels of analysis. We identify four different usages of the social network concept in the social entrepreneurship literature: embeddedness of social entrepreneurship, collective social entrepreneurship, networking as a critical skill or activity of social entrepreneurship, and finally networking and the creation of social capital as a goal of social entrepreneurship. Theoretical frameworks explaining the emergence of conventional entrepreneurship with a social network lens are identified. These are evaluated with regard to social entrepreneurship and suggested to constitute an important source of inspiration for future research. [less ▲]

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See detailIs Belgium lagging behind in sustainability management? An international empirical analysis
Crutzen, Nathalie ULg; Hoerisch, Jacob

Conference (2013, September)

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See detailHydraulic modelling of the river Meuse
Dewals, Benjamin ULg; Huismans; Stilmant, Frédéric ULg et al

Conference (2013, September)

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See detailMeasurements of non-Rutherford cross sections for 4-15 MeV alpha particles on light elements from C to Si
Chene, Grégoire ULg; Mathis, François ULg; Fleury-Frenette, Karl ULg et al

Conference (2013, September)

These last years Ion Beam Analysis users show an interest in High Energy Alpha beams[1]. These beams can be used for on-site analysis by means of radioactive sources e.g. for space application but they ... [more ▼]

These last years Ion Beam Analysis users show an interest in High Energy Alpha beams[1]. These beams can be used for on-site analysis by means of radioactive sources e.g. for space application but they also offer a powerful combination of properties for the analysis of thick layers (about 10 to 20 µm). This kind of layers is often met in cultural heritage applications but can be also present on new materials. Contrary to this kind of materials where the principal information needed is the in-depth profiles as the sample are of known composition, for cultural heritage materials the combination of elemental analysis and their in-depth distribution is essential as the nature of the material is a-priori not known. In this perspective high energy alpha beams can produce really interesting results as their PIXE cross-sections increase from 6 MeV while the lower penetration of the beam (comparing to classical protons beams) allows to limit the analysis to the layer of interest. For the elemental in depth distribution we take advantage of the good mass separation of the alpha particles and the non-Rutherford phenomena allow the analysis even of light elements which are of great interest in cultural heritage problematic as far as the cross section are well tabulated. Using two IBA facilities (AGLAE in Paris and the HE-HR beam line of the cyclotron in Liège University[2]) we explored the backscattering cross section of numerous light elements (from C to Si) from 4 to 15 MeV in order to check the lack in the literature, to verify the deviation from Rutherford law and compare it to the existing theoretical models. We begin to measure the needed cross sections using thick target in case of smooth cross section and thin layers for exploring important variation of the cross section. [less ▲]

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See detailLa procédure européenne de règlement des petits litiges. Règlement n°861/2007
Berthe, Aude ULg

Conference (2013, September)

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See detailThe Search for Meaning in the Postmodern World
Dechene, Antoine ULg

Conference (2013, September)

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See detailComparison of parameterization schemes for solving the discrete material optimization problem of composite structures
Duysinx, Pierre ULg; Guillermo Alonso, Maria ULg; Gao, Tong et al

Conference (2013, September)

In the context of weight reduction challenges in aerospace, automotive, and energy engineering problems, composite materials are gaining a revived interested. Because of the problem complexity and the ... [more ▼]

In the context of weight reduction challenges in aerospace, automotive, and energy engineering problems, composite materials are gaining a revived interested. Because of the problem complexity and the large number of design variables, their design of composite structures is greatly facilitated by using optimization techniques. While several formulations have been proposed for composite structure design, Stegmann and Lund [1] have showed that composite optimization can take advantage of the topology optimization approach. The fundamental idea of the Discrete Material Optimization (DMO) approach is 1/ to formulate the composite optimization problem as an optimal material selection problem in which the different laminates and ply orientations are considered as different materials and 2/ to solve the optimization problem using continuous existence variables. To transform the discrete problem into a continuous one, one introduces a suitable parametrization identifying each material by a unique set of design variables while the material properties are expressed as a weighted sum of all candidate materials. Using DMO approach, one can solve within a common approach, different design problems such as laminate distribution problem, stacking sequence optimization... The inherent difficulties of the discrete material selection using topology optimization are 1/ to find efficiency interpolation and penalization schemes of the material properties and 2/ to be able to tailor an efficient solution algorithm to handle very large scale optimization problems. Besides the reference DMO scheme by Lund and his co-authors, other interpolation schemes have been proposed: In this paper, work we are considering and comparing DMO with two other schemes namely the Shape Function with Penalization Parameterization (SFP) by Bruyneel [2] and it recent extension, the Bi-value Coding Parametrization (BCP) by Gao et al. [3]. In particular, the work considers the different schemes in the perspective of solving large-scale industrial applications. The work considers several aspects of the different schemes: • Nature of the different interpolation schemes, • Penalization strategies (power law (SIMP), RAMP, Tsai-Halpin or polynomial), • Number of design variables, the size and complexity of the optimization problem, • Sensitivity to local optima, to the initial design variable, and the development of continuous penalization techniques, • Ability to be extended to various formulations from compliance problems to local restrictions and buckling. As a major drawback, DMO, SFP and BCP approaches increase dramatically the number of design variables. Because of the computational burden to solve the optimization problems, in most of DMO implementations, the considered structural responses are generally limited to compliance-like objective functions. In order to extend the DMO formulation, the work investigates the selection of the most appropriate and efficient optimization algorithms to handle the problems. Different schemes of the sequential convex programming are compared. At first the classic schemes MMA and CONLIN are tested. Then more advanced schemes of the MMA family (Bruyneel et al. [4]) are experimented. The work and the comparisons are carried out on several numerical applications related to the selection of optimal local fibre orientations (with up to 36 candidate material orientations) in membrane and shell aerospace or automotive structures. The various numerical test problems include academic examples and benchmarks inspired by industrial applications. [less ▲]

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See detailTense use in English factive complements
Gentens, Caroline; Brems, Lieselotte ULg; Davidse, Kristin et al

Conference (2013, September)

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See detailNanoparticles used to darken the patina of antic black bronze: TEM observations on new experimentations
Mathis, François ULg; Tirat, Sophie; Grieten, Eva et al

Conference (2013, September)

Some studies that started in the nineties [1] proved that some antic artefacts or parts were intentionally patinated using a chemical treatment. In particular one type of patina was characterized on ... [more ▼]

Some studies that started in the nineties [1] proved that some antic artefacts or parts were intentionally patinated using a chemical treatment. In particular one type of patina was characterized on artefacts coming either from Egyptian civilization, Mycenaean period or Roman Empire. This patina has been identified as a precious material mentioned in ancient Egyptian and Roman texts. This particular material is named, depending on the artefacts’ origin, black bronze (hmty km), or corinthium aes. This patina is made on copper alloys containing gold and/or silver and is composed mainly of cuprite. It was compared with a Japanese patina which appears in medieval times but which is still in use and known under the name of shakudo. Shakudo are copper gold alloys and they are treated chemically by means of different recipes named nikomi-chakushoku which developed a black layer of cuprite on the surface. An important study of antic artefacts coming from the collections of French museums has been carried out since the beginning of the 2000’s. An experimental protocol based on non-invasive analysis was developed to analyse these very precious objects and to identify and characterize this type of patina in function of the provenance and age of the artefacts [2, 3]. However, some questions about this particular surface layers could not be resolved using this experimental protocol due to the limitation of non-invasive analytical techniques: In particular the question of the formation of the oxide layer, the colouring mechanism of this black cuprite (copper oxide which is red under natural form) and the important adherence properties. We developed a program of experimentation to make some black patina. These experimentations were based on the utilisation of the Japanese recipes, and we tried to differentiate the effect of the alloying element (Au, Ag, As) and the effects of the chemical treatment. These patinas were studied by means of various analytical methods and in particular we used TEM to characterize the fine structure of the oxide layer. The use of transmission electron microscopy (TEM) allows to evidence a hypothesis already mentioned in previous studies [4]: the presence of nanoparticles of gold in the cuprite layers and their role on the coloration of the patina making the black bronze the very first applications of nanoparticles in technical history. [less ▲]

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See detailEurabian Nights: From Narrative Identities to Imagined Communities
Claisse, Frédéric ULg

Conference (2013, September)

Though the themes of ‘counter-jihad’ and ‘islamofascism’ contributed to somehow renew the far right discourse, it is arguable that the core structure of the underlying political narrative remained ... [more ▼]

Though the themes of ‘counter-jihad’ and ‘islamofascism’ contributed to somehow renew the far right discourse, it is arguable that the core structure of the underlying political narrative remained unchanged – ‘Muslims’ merely taking the place of Jews in the role of ‘enemies from within’, while Islam superseded communism as the major totalitarian threat to the Western world. Taken as a globalised narrative, counter-jihad discourse displays striking differences between its North American and European versions, the former emphasizing Islam as a rather external, terrorist threat, whereas the latter denounces it as a cultural peril, resulting from an alleged failure of multiculturalism both as a policy and as an ideology. The ‘Eurabia’ conspiracy theory often serves as the bedrock of these narratives: a deliberate, albeit covert policy framework set by European and Arab leaders in order to gradually establish a Muslim majority in Europe. Still, the question remains whether these new discursive entities function as pure ‘identity markers’ or reveal original, unprecedented forms of ‘imagined communities’ (B. Anderson). In this respect, the Eurabian scenario contrasts sharply with the traditional far right rhetoric of decline: as it sets a seemingly inescapable, dystopian horizon, it paradoxically presupposes the existence of an organized political community actually able to do something to prevent that dark future from happening. Through ‘heuristics of fear’ (H. Jonas), Eurabia aims at creating a community of politically aware individuals and empowering them for current and future struggles. In our paper, we propose to analyse such ‘imaginary institution’ of a counter-jihad society. Using controversy mapping tools to show the relation between actors of the movement, we will particularly focus on the blogging community and its notably prominent role in the spreading and structuring of the Eurabian dystopia. [less ▲]

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See detailMonsieur Pain: A Metaphysical Detective Story?
Dechêne, Antoine ULg

Conference (2013, September)

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See detailShastasaurid ichthyosaurs and other lost critters from the French Rhaetian
Fischer, Valentin ULg; Goolaerts, Stijn

Conference (2013, September)

Recent advances in the phylogeny and evolution of diversity of ichthyosaurs have recognized a smaller number of more intense turnovers compared to the previous understanding of their evolutionary history ... [more ▼]

Recent advances in the phylogeny and evolution of diversity of ichthyosaurs have recognized a smaller number of more intense turnovers compared to the previous understanding of their evolutionary history. One of these crucial turnovers occurred during the Late Triassic, when all ichthyosaur clades but a minor subset, the parvipelvians, went extinct. The timing and, hence, the severity of this event is however poorly understood and may have been protracted over the entire middle Norian–latest Rhaetian interval, more than 15 million years. The iconic, whale-sized shastasaurid ichthyosaurs are regarded as early victims of this turnover, disappearing by the middle Norian. In 1883, Henry Emile Sauvage (1842–1917), a famous French palaeontologist, described reptilian remains from a Rhaetian bonebed near Autun in eastern France. But this material was subsequently lost and disappeared from the literature. We have re-discovered most of this material in the fossil vertebrates collections of the Katholieke Universteit Leuven, Belgium. Reassessment of this material indicates the presence of very large shastasaurid ichthyosaurs (Ichthyosaurus rheticus, Rachitrema pellati [partim]), probable choristoderes (Actiosaurus gaudryi) and plesiosaurs (Plesiosaurus bibractensis). The occurrence of shastasaurids in Rhaetian strata is corroborated by recent findings in a new locality in southern France. This suggests that the final extinction of this important Triassic clade coincides with the rapid radiation of neoichthyosaurs, forming a short but extremely profound turnover that drastically impacted the evolutionary history of ichthyosaurs. [less ▲]

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See detailTheoretical and experimental investigation of the GeSn bandgap
Shimura, Yosuke; Wang, Wei; Gencarelli, Federica et al

Conference (2013, September)

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See detailThe role of segmentation and investor recognition trough the lens of cross-listing activity
Mouchette, Xavier ULg; Muller, Aline ULg; Carrieri, Francesca

Conference (2013, September)

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See detailCompétences durables et transférables, clés pour l’employabilité
Dujardin, Jean-Marie ULg

Conference (2013, September)

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See detailLa correction de l'expression écrite en langue étrangère en Fédération Wallonie-Bruxelles : expliciter l'implicite ?
Noiroux, Kevin ULg; Simons, Germain ULg

Conference (2013, September)

Dans cette communication, nous analyserons les croyances et pratiques des enseignants d'anglais/langue étrangère en matière de rétroactions fournies en expression écrite.

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See detailDosage de la cocaïne, des opiacés et des amphétamines dans le sérum par LC/MSMS
DUBOIS, Nathalie ULg

Conference (2013, September)

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See detailSolar buildings and the urban environment
Marique, Anne-Françoise ULg; Reiter, Sigrid ULg

Conference (2013, September)

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See detailAnisotropic Orientations of Polarisations from quasar light
Pelgrims, Vincent ULg

Conference (2013, September)

Presentation of the foundations of a new statistical test dedicated to the polarisation orientations analysis.

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See detailTon d'instit ? Variation prosodique en invariant situationnel chez une institutrice de maternelle
Lambeau, Céline ULg

Conference (2013, September)

L'article rend compte d'une étude macro-prosodique à visée exploratoire, menée sur des échantillons de parole adressée d'une institutrice. L'analyse se fonde sur quatre séquences enregistrées dans une ... [more ▼]

L'article rend compte d'une étude macro-prosodique à visée exploratoire, menée sur des échantillons de parole adressée d'une institutrice. L'analyse se fonde sur quatre séquences enregistrées dans une classe de 1e-2e maternelle et indique une correspondance partielle entre le ton de l'institutrice et le phénomène de l'infant-directed-speech, et des variations légères de certains paramètres prosodiques selon le type d'activité menée. [less ▲]

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See detailA new criterion to assess distributional homogeneity in hyperspectral images of solid pharmaceutical dosage forms
Sacre, Pierre-Yves ULg; Lebrun, Pierre ULg; Chavez, Pierre-François ULg et al

Conference (2013, September)

During galenic formulation development, homogeneity of distribution is a critical parameter to check since it may influence activity and safety of the drug. Several techniques exist to assess this ... [more ▼]

During galenic formulation development, homogeneity of distribution is a critical parameter to check since it may influence activity and safety of the drug. Several techniques exist to assess this homogeneity, the most used and recognized being HPLC. However, these techniques are destructive, time consuming and uses a lot of organic solvents. Vibrational spectroscopies are promising green chemistry techniques that may replace HPLC for several analysis tasks thanks of their rapid, non-destructive and non-pollutant characteristics. Raman hyperspectral imaging is a technique of choice for assessing the distributional homogeneity of compounds of interest. Indeed, the combination of both spectroscopic and spatial information provides a detailed knowledge of chemical composition and component distribution. When dealing with hyperspectral imaging, multivariate data analysis is necessary to extract the concentration map of the compound of interest that will be used to assess sample homogeneity. Actually, most authors assess homogeneity using parameters of the histogram of intensities (e.g. mean, skewness and kurtosis). However, this approach does not take into account spatial information and loses the main advantage of imaging. Recently, Rosas et al. proposed a homogeneity index based on the Poole index. However, it necessitates cutting the maps in non-overlapping macropixels and is therefore quickly limited with small maps. To overcome this limitation, we propose a new criterion that combines Continuous Level Moving Blocks and homogeneity curves with a randomization step to assess the distributional homogeneity. This distributional homogeneity index (DHI) enables analysis of hyperspectral maps without apriori knowledge. It has been applied on five pharmaceutical formulations with different blending conditions. The uniformity content values of the API (present at a concentration of 7% w/w) measured by HPLC ranged from RSD: 0.46% to 11.04%. Ten tablets per formulation have been mapped over a region of interest of 4 mm². After extracting pure spectra by MCR-ALS, the concentration maps of the API were computed using classical least squares analysis. DHI have been computed with a hundred simulations for the randomization step for each concentration map. Afterwards, a mean DHI and standard deviation values were computed per formulation. A linear relationship has been observed between the RSD values and the mean DHI. These results enabled us to select the formulation with the best homogeneity. Further experiments are in progress to check whether hyperspectral imaging combined with DHI could be used in routine to assess blending homogeneity of well-known formulations. [less ▲]

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See detailQuel est l'avenir de la profession de perfusionniste?
BLAFFART, Francine ULg

Conference (2013, September)

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See detailA nap to recap: Reward strengthens relational memory during daytime sleep
Gaggioni, Giulia Alice ULg; Igloi, Kinga; Eryilmaz, Hamdi et al

Conference (2013, September)

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See detailCoMBiSpeC: A novel approach in the modelling of massive binaries
Palate, Matthieu ULg

Conference (2013, September)

Spectral modelling and especially for massive stars is not a straightforward problem and over the past decades many advances have been made in this field. We now have very efficient model atmosphere codes ... [more ▼]

Spectral modelling and especially for massive stars is not a straightforward problem and over the past decades many advances have been made in this field. We now have very efficient model atmosphere codes such as CMFGEN and TLUSTY for example. However, these codes are based on the assumption that the star is single and spherical which is no longer valid for the components of a binary system. On the other hand, observational studies indicate that binarity has an impact on the spectra and binary interactions impact the analyses of the spectra. This is why we have developed a very first model called CoMBiSpeC (code of massive binary spectral computation). We present here some examples of the impact of the binarity on the shape of the stars and the resulting effects on their spectra. [less ▲]

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See detailBiochar impact on CO2 and N2O emissions from cereal fields in Norway
Rasse, Daniel, P.; O'Toole, Adam; Carnol, Monique ULg et al

Conference (2013, September)

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See detailAdvanced Thermal Control of Launcher Equipment Bay using Phase Change Material
Collette, JP; Rochus, Pierre ULg; Peyrou-Lauga, R et al

Conference (2013, September)

In the frame of ESA’s Future Launchers Preparatory Programme (FLPP), attention has been paid to the use of Phase Change Materials (PCM) for thermal control of Launchers. Among various possible ... [more ▼]

In the frame of ESA’s Future Launchers Preparatory Programme (FLPP), attention has been paid to the use of Phase Change Materials (PCM) for thermal control of Launchers. Among various possible applications, the avionics equipment bay of Ariane 5LV has been chosen to assess the performance of a Phase Change Material Heat Storage Device. Generally, the thermal control of the electronic units is passive and simply defined by their thermal inertia. In some specific case, an extra thermal inertia is added by using a spreader (thick Al plate) and the coupling with the platform is optimized. The price to pay is an extra mass for the launcher. A new concept of Phase Change Material device, using organic PCM, has recently been developed to improve the thermal control of spacecraft. This concept has been extended to the specific environment of a Launcher and to inorganic salt hydrates. The main results of this study are presented in this paper. [less ▲]

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See detailMulti-scale studies of foamed materials
Nguyen, Van Dung ULg; Noels, Ludovic ULg

Conference (2013, September)

We propose a multi-scale study to predict micro-buckling that could happen in foamed materials. At the macroscopic scale, when localization occurs, the characteristic size of macroscopic deformation is ... [more ▼]

We propose a multi-scale study to predict micro-buckling that could happen in foamed materials. At the macroscopic scale, when localization occurs, the characteristic size of macroscopic deformation is the same order of the microscopic size. The assumption of material action in standard multi-scale computational homogenization approach where the stress only depends on the strain at this point is no-longer suitable, which motivates the uses of the second-order scheme. In this work, an implementation of the second-order continuum based on a discontinuous Galerkin approximation is shown to be particularly efficient to constrain weakly the continuities of the displacement field and of its gradient. At the microscopic scale, classical finite element resolutions of RVEs are considered. To enforce the periodic boundary condition of this micro problem, we propose an efficient method, which is based on the polynomial interpolation, and allows applying the periodic boundary condition without requiring conformal meshes. The micro-macro transition follows the second-order computational homogenization scheme. With the proposed framework it is shown that, during the macroscopic loading, the micro- buckling of the thin components of the foamed structure (cell walls and edges) can occur even if the tangent modulus of micro-material is still elliptic since the homogenized tangent modulus at macro-scale can lose its ellipticity. In that case, the localization occurs at macro- scale and can be captured by the model. [less ▲]

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See detailCassini’s recent high inclination views of Saturn’s UV aurorae
Grodent, Denis ULg; Gustin, Jacques ULg; Radioti, Aikaterini ULg et al

Conference (2013, September)

On 22 May 2012, Cassini flew by Titan at a closest approach distance of 955 km. This T83 flyby significantly changed the inclination of the spacecraft’s orbit and marked the beginning of the XXM inclined ... [more ▼]

On 22 May 2012, Cassini flew by Titan at a closest approach distance of 955 km. This T83 flyby significantly changed the inclination of the spacecraft’s orbit and marked the beginning of the XXM inclined phase 1 which will last until March 16, 2015. During this 3-year period, the inclination of Cassini’s orbit reaches very high values, up to 62° in April 2013. This makes it possible to obtain exceptionally good views of Saturn’s poles to observe the auroral emissions in different wavelength ranges. In this presentation, we will summarize the auroral observations taken in the UV with the UVIS camera. We will focus on the morphology of the emission and pinpoint signatures that are attributed to various magnetospheric processes, such as dayside reconnection and auroral bifurcations, nightside reconnection, hot plasma injections. We will also take advantage of the view from nearly above the poles to describe the overall shape and size of the aurora, which are expected to respond to the solar wind conditions. This set of data is to be compared with the contemporaneous observations obtained from the different remote and in situ instruments onboard Cassini. It will also be completed by quasi- simultaneous UV observations of the northern aurorae caught by HST in April 2013 and may allow inter hemispheric comparisons. This information will be used to constrain the various processes at play in Saturn’s magnetosphere. [less ▲]

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See detailModelling Time Reversal Applications in a Reverberation Chamber using the Current Image Method
Spirlet, Maxime; Broun, Valery; Camus, Philippe et al

Conference (2013, September)

In this paper, we present a numerical model to analyze Time Reversal applications in a reverberation chamber using the current image method. The principles behind this numerical model are presented in the ... [more ▼]

In this paper, we present a numerical model to analyze Time Reversal applications in a reverberation chamber using the current image method. The principles behind this numerical model are presented in the first part of the paper. The major advantage of this reverberation chamber model is that it requires a lot less computing time than usual solvers with qualitatively satisfying results. Next, an extension of our method to model Time Reversal Mirrors in reverberating cavities is described. Finally, two examples of Time Reversal refocusing using Time Reversal Mirrors of one or several elements are presented for illustration. [less ▲]

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See detailRèglement successions (650/2012) - présentation générale
Wautelet, Patrick ULg

Conference (2013, September)

Cette présentation a servi de support à une formation visant à présenter les grandes lignes du Règlement successions (650/2012) à l'intention de la pratique notariale belge. La présentation a mis l'accent ... [more ▼]

Cette présentation a servi de support à une formation visant à présenter les grandes lignes du Règlement successions (650/2012) à l'intention de la pratique notariale belge. La présentation a mis l'accent sur les nouveautés pour cette pratique, ainsi que sur les difficultés posées par l'interprétation de certaines dispositions du Règlement. [less ▲]

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See detailCurrent crowding effects in nanostructured superconductors
Silhanek, Alejandro ULg

Conference (2013, September)

When current stream lines are forced to depart from their rectilinear trajectory due to the presence of an obstacle, they conglomerate at the sharp bends encountered on their path. The consequent current ... [more ▼]

When current stream lines are forced to depart from their rectilinear trajectory due to the presence of an obstacle, they conglomerate at the sharp bends encountered on their path. The consequent current crowding is present in normal metals as well as in superconductors and has been recently recognized as an important factor limiting the performance of superconducting single-photon detectors, leading to vortex motion rectification, and being a source of unwanted ratchet signal. In this talk we will show that in nanostructured superconductors at low temperatures, current crowding can also trigger abrupt flux avalanches developing well defined geometrical patterns. [less ▲]

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See detailProduction of anionic extracellular polysaccharide by Enterobacter A47 using cheese whey as feedstock
Antunes, S; Alves, V.D.; Grandfils, Christian ULg et al

Conference (2013, September)

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See detailLe procédure européenne d'injonction de payer. Le règlement n° 1896/2006
Berthe, Aude ULg

Conference (2013, September)

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See detailLie group formalisms in flexible multibody dynamics
Bruls, Olivier ULg

Conference (2013, September)

This course presents a recently-developed Lie group approach for the analysis of flexible multibody systems with large rotations and kinematic constraints in a parameterization-free setting. More ... [more ▼]

This course presents a recently-developed Lie group approach for the analysis of flexible multibody systems with large rotations and kinematic constraints in a parameterization-free setting. More precisely, the equations of motion are formulated as differential-algebraic equations (DAE) on a matrix Lie group and are then solved using a Lie group time integration method. Based on a nonlinear finite element approach, the lecture shows how the kinematics of a flexible multibody system, including the description of nodal frames, velocity fields, constraints, and flexible bodies, are described in the Lie group framework. The general structure of the equations of motion are derived from the Hamilton principle in a general and unifying approach. A Lie group generalized-alpha time integration scheme is proposed for DAEs on a Lie group and practical implementation issues are discussed. Finally, semi-analytical algorithms for sensitivity analysis on a Lie group are proposed for optimization purpose. The theoretical concepts and the numerical properties of the algorithms are illustrated with a number of examples. [less ▲]

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See detailEstablishment of a sedimentation monitoring system of irrigation dams in Burkina Faso: The PADI project
Hallot, Eric ULg; Guyon, Francis; de Thysebaert, Didier et al

Conference (2013, August 31)

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See detailEarly retention in kindergarten: risk factors and pathways in primary education
Lafontaine, Dominique ULg; Chenu, Florent ULg; Dupont, Virginie

Conference (2013, August 31)

In French-speaking Belgium, about 4% of the children are retained in kindergarten. What are the pupils’ characteristics and the school context variables predictive of the retention in kindergarten? What ... [more ▼]

In French-speaking Belgium, about 4% of the children are retained in kindergarten. What are the pupils’ characteristics and the school context variables predictive of the retention in kindergarten? What are the pathways in primary education of “retained” pupils compared to their peers who started 1st grade “on time”? How can this early retention be explained? A broad database with entire cohorts has been used for studying the risk factors and the pupils’ school careers in primary education. Moreover, teachers’ beliefs about retention, learning and teaching have been investigated through a questionnaire administered to a representative sample of preschool and 1st grade teachers. The multilevel regression analyses show that the following variables are significantly predictive of retention in kindergarten: month of birth, gender, socioeconomic status, country of birth and at the school level, mean school social intake. Investigation about teachers’ belief shows that the vast majority of teachers are convinced that retention in kindergarten is beneficial for later achievement and not detrimental at a psychological level. Preschool and 1st grade teachers share some mutual expectations about the level of prerequisites for entering 1st grade. Even if they are no formal instructions or benchmarks, kids who are not “ready” should not enter 1st grade, but rather stay one more year in kindergarten. Those results can be related to the “culture” of the education system in Belgium, a non-comprehensive one: pupils with learning difficulties are kept apart from their age group or peers through grade retention, early tracking and special education. [less ▲]

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See detailEarly retention in kindergarten: risk factors and school career in French-speaking Belgium primary education
Lafontaine, Dominique ULg; Chenu, Florent ULg; Dupont, Virginie ULg

Conference (2013, August 31)

In French-speaking Belgium, about 4% of the children are retained in kindergarten. What are the pupils’ characteristics and the school context variables predictive of the retention in kindergarten? What ... [more ▼]

In French-speaking Belgium, about 4% of the children are retained in kindergarten. What are the pupils’ characteristics and the school context variables predictive of the retention in kindergarten? What are the pathways in primary education of “retained” pupils compared to their peers who started 1st grade “on time”? How can this early retention be explained? A broad database with entire cohorts has been used for studying the risk factors and the pupils’ school careers in primary education. Moreover, teachers’ beliefs about retention, learning and teaching have been investigated through a questionnaire administered to a representative sample of preschool and 1st grade teachers. The multilevel regression analyses show that the following variables are significantly predictive of retention in kindergarten: month of birth, gender, socioeconomic status, country of birth and at the school level, mean school social intake. Investigation about teachers’ belief shows that the vast majority of teachers are convinced that retention in kindergarten is beneficial for later achievement and not detrimental at a psychological level. Preschool and 1st grade teachers share some mutual expectations about the level of prerequisites for entering 1st grade. Even if they are no formal instructions or benchmarks, kids who are not “ready” should not enter 1st grade, but rather stay one more year in kindergarten. Those results can be related to the “culture” of the education system in Belgium, a non-comprehensive one: pupils with learning difficulties are kept apart from their age group or peers through grade retention, early tracking and special education. [less ▲]

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See detailCross-cultural differences in teaching strategies, opportunities-to-learn and achievement in reading
Lafontaine, Dominique ULg; Monseur, Christian ULg; Baye, Ariane ULg et al

Conference (2013, August 31)

Using the PISA 2009 data from 43 education systems, the present study aimed at exploring to what extent is reading achievement of 15 year-olds explained by variations in reading curriculum. Factorial ... [more ▼]

Using the PISA 2009 data from 43 education systems, the present study aimed at exploring to what extent is reading achievement of 15 year-olds explained by variations in reading curriculum. Factorial analyses have been performed on the “reading for school” (RFS) variables. Four factors were extracted; configural, metric and scalar invariance were checked for, showing that configural and metric invariance were met, whereas scalar invariance was not. Correlations in each country were then computed between the 4 RFS factors and reading achievement score. Finally, Multi-level analyses were used to estimate the school and student level variance in reading achievement explained in each country by the 4 RFS factors and the students’ socioeconomic and cultural background. Two of the factors (interpretation of literary texts and use of non-continuous texts) were positively related to reading achievement and one (use of functional texts) was negatively related to reading in most of the countries. Interestingly, the factor Traditional literature course was negatively linked with achievement in many countries, but positively related to reading in a number of Asian countries. The multilevel analyses showed that more than half of the between-school variance on average could be explained by the RFS factors (uniquely or jointly with background variables). The between-school variance explained by the RFS factors was larger in tracked educational systems, suggesting that curricular variations in the language courses linked to tracking might have an impact on reading even if reading is not usually taught as a specific subject to 15-year-olds students. [less ▲]

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See detailJeux et enjeux en atelier-théâtre: un engagement tout au présent
Brahy, Rachel ULg

Conference (2013, August 30)

Cette contribution interroge les modalités d’engagement de soi dans l’action théâtrale. Les questions suivantes guident l’analyse. Comment les participants s’engagent dans l’atelier-théâtre? Quels ... [more ▼]

Cette contribution interroge les modalités d’engagement de soi dans l’action théâtrale. Les questions suivantes guident l’analyse. Comment les participants s’engagent dans l’atelier-théâtre? Quels rapports instaurent-ils vis-à-vis d’eux-mêmes et d’autrui? Quelles sont les manières d’être et d’agir qui paraissent pertinentes en situation? Quel est le travail du comédien-animateur? Comment encadre-t-il l’action? Cela nous mènera à décrire des situations concrètes d’ateliers et à ressaisir les ajustements, cadrages et "mode de coordination" (Thévenot, 2009) qui président dans le dispositif. En nous référant à la sociologie des régimes d’engagement de Laurent Thévenot (2006), on verra alors comment se décline une modalité d’engagement propre à l’atelier-théâtre. Cette dernière imposerait un rapport particulier à soi, fondé sur la recherche d’une expérience dans un mouvement de convergence avec autrui. En effet, dans le dispositif, une importance particulière est accordée à la formation d’un collectif qui s’instaure, tout en douceur, au travers de jeux et exercices théâtraux. Nous appellerons cet engagement, "engagement en présence". [less ▲]

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See detailZnO/PVA Macroscopic Fibers Bearing Anisotropic Photonic Properties
Kinadjian, Natacha ULg; Achard, Marie-France; Julian-Lopez, Beatriz et al

Conference (2013, August 30)

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See detailCurrent developments in the improvement of PE teachers’ action with overweight students
Cloes, Marc ULg

Conference (2013, August 30)

Globally, researchers regularly note the growing prevalence of weight excess and obesity among all population groups (Sassi, 2010). This trend is now considered a real epidemic. Weight gain and obesity ... [more ▼]

Globally, researchers regularly note the growing prevalence of weight excess and obesity among all population groups (Sassi, 2010). This trend is now considered a real epidemic. Weight gain and obesity are associated with several endogenous and exogenous factors among which inappropriate nutrition and sedentary lifestyle are clearly emphasized (Gahagan, 2004). Beyond the harmful consequences on individual health, the increasing proportion of overweight/obese individuals is already contributing to an increase in health care costs that will reach unmanageable proportions in few decades. Therefore, an increasing number of national and international bodies underline the need to implement effective programs designed to improve the citizen’s lifestyle. Over the last decade, the literature is replete with studies that demonstrate the positive effects of local and/or broader programs designed to address the issue of weight control and obesity prevention/treatment. Despite the encouraging data, it seems that the real impact on the society lacks consistency. It appears that multi-sectoral approaches are required. In such models, the School is identified as a determining component that should be implemented but cannot be considered as the magic remedy of a complex challenge like obesity (Fridlund Dunton et al., 2011; Lee et al., 2006). In fact, at school, each child is expected to acquire competences and knowledge that she/he will be able to use lifelong. Nevertheless, without the support of the other pillars of the society, any action undertaken at school would be a sword strike into water. Moreover, within the school, the fight against obesity needs the combined action of several partners in a multidimensional intervention. As a result of its links to the promotion of physical activity and health, physical education (PE) is logically presented as a key element in the strategies to be implemented (Tappe & Burgeson, 2004). However, for PE teachers, the growing number of overweight/obese students seems to represent a real challenge. Indeed, these students require specialized attention that, in the same time, cannot result in a stigmatization of the students’ characteristics. It first appears that PE teachers experience some difficulties in clearly identifying those students who need real intervention. Moreover, PE teachers express real concern over what can be done without causing harm to the overweight/obese student, this situation being especially relevant with the adolescent student (Cloes & Ziant, 2009; Rukavina et al., 2010). The presentation will focus on the current state of the research on PE teachers’ potential actions with overweight/obese students. The aim is to illustrate the avenues that are currently being explored. The presentation will offer a review of the steps of a research program addressing student obesity in PE developed at the University of Liege over the past several years. [less ▲]

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See detailHepatocholecystitis due to Salmonella Dublin in a crossbred calf
Ronzoni, Anna ULg; Bayrou, Calixte ULg; Evrard, Laurence ULg et al

Conference (2013, August 30)

Detailed reference viewed: 46 (20 ULg)
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See detailStream incision and sediment wave consecutive to three centuries of timber floating in the Morvan Massif (Central France)
Gob, Frédéric ULg; Jacob-Rousseau, Nicolas; Le Drezen, Yann et al

Conference (2013, August 30)

The upper catchment of the Yonne River is nowadays usually considered as having been scarcely impacted by human activity. At the Seine basin scale, the gravel bed streams flowing down the small forested ... [more ▼]

The upper catchment of the Yonne River is nowadays usually considered as having been scarcely impacted by human activity. At the Seine basin scale, the gravel bed streams flowing down the small forested massif of the Morvan are even considered as of high ecological quality. However, this perception of the river changes completely once one looks back to the recent past. Indeed, these streams have been subject to intensive industrial activity for more than 300 years, between the 16th and early 20th centuries, as Paris’ need for timber fuel amplified. The Yonne River and all of its tributaries were heavily modified to facilitate the transportation of timber logs towards Paris through floating on the Morvan’s dense network of streams and the Yonne’s and Seine’s main channel. This activity has led to intense modifications of sediment flux still easily observable on the present river morphology, 90 years after the floating activity ended. Every single stream of the upper Yonne catchment was equipped with small ponds allowing the generation of water releases, flushing the logs downstream. Historical archives allowed the discharges and the frequency of these flushes to be calculated. Artificial floods developing specific stream powers of over 250 W/m² were generated several times per week during wintertime in steep-sided streams that were 4 to 5 m wide. Such energy generated a drastic increase in sediment transport and led to erosion and massive incision of the beds. A few kilometers downstream, when the small tributaries joined the main valley, the Yonne River had a larger bed and gentler slope. Artificial floods were thus less powerful there (specific stream powers lower than 80 W/m²) and sediment transport conformed more to natural conditions. Considering the huge amount of sediment supply from upstream and the slowing down of the sediment flux, the Yonne river bed aggrades. A perched riverbed today lies up to 1.5m higher than the floodplain and may be seen on more than 25 km of the course. [less ▲]

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See detailAssessing the success of river restoration projects through Geomorphology
Peeters, Alexandre ULg; Verniers, Gisèle; De le Court, Bernard et al

Conference (2013, August 30)

In the context of the Water Framework Directive’s goal of attaining “good ecological status”, a LIFE+ project (called Walphy), co-funded by the European Union and the Service Public de Wallonie, was ... [more ▼]

In the context of the Water Framework Directive’s goal of attaining “good ecological status”, a LIFE+ project (called Walphy), co-funded by the European Union and the Service Public de Wallonie, was launched in 2009. It aims to undertake experimental river restoration projects and to assess their success on the basis of ecological and geomorphological monitoring. Geomorphological monitoring differs depending on the type of restoration project: improvement of longitudinal continuity or transversal continuity. Restoration projects involving longitudinal continuity concern courses where obstacles impede the free movement of fish and sediment. In the Bocq basin, many of these obstacles (old weirs between 1 and 3 m high) have been removed. The release of sediment was studied using traced pebbles (PIT tags), which enable the recovery of bedload transport to be highlighted. Additional monitoring is based on the comparison of topographic surveys and cross-sections carried out pre- and post-removal. This can show a recovery of the natural transport of sediment when stream bed aggradation is observed downstream from the removed dam. Restoration projects involving transversal continuity concern straightened courses with artificial banks and therefore poor stream-floodplain connectivity. These works consist of enhancing river channels and restoring meanders or banks. Geomorphological monitoring is also based on surveys conducted pre- and post-restoration work. Some reaches have been improved by the reintroduction of spawning gravel. Several methods were used to characterize the clogging of this gravel reintroduction (hydraulic conductivity, wooden stakes). In addition, the mobility of this gravel was monitored using traced pebbles (PIT tags). Finally, restoration works and their stability and resistance to erosion are considered in relation to flood characteristics (discharge, recurrence, specific stream power and shear stress). [less ▲]

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See detailUsing drones to count the elephants: a new approach of wildlife inventories
Linchant, Julie ULg; Vermeulen, Cédric ULg; Lisein, Jonathan ULg et al

Conference (2013, August 29)

The use of UASs (Unmanned Aerial Systems) in wildlife survey is still recent but the fast development of this technology shows great possibilities and it could soon become an inevitable tool in wildlife ... [more ▼]

The use of UASs (Unmanned Aerial Systems) in wildlife survey is still recent but the fast development of this technology shows great possibilities and it could soon become an inevitable tool in wildlife management. The purpose of this study was to test the feasibility of inventories by UAS to survey large mammals in the Nazinga Game Ranch in the south of Burkina Faso. The Gatewing X100TM equipped with a Ricoh GR III camera was used to test the animal reaction as it passed, and their visibility on the images. A set of more than 7000 images was collected and observations revealed that only elephants (Loxodonta africana) were easily visible while medium and small sized mammals were not. At a height of 100 m the easy observation of elephant allows experts to enumerate them on images and no reaction was recorded as the UAS passed. We therefore implemented an aerial strip sample count along transects used for the annual wildlife foot count. A total of 34 elephants has been recorded on 4 transects, each overflown twice. The elephant density was estimated at 2.47 elephants/km2 with a coefficient of variation (CV%) of 36.10 %. UAS inventory of elephants is promising but improvements need to be done. The main drawback of our UAS was its autonomy. If we wish to replace manned aircraft survey of large areas (about 1000 km of transect per day vs 40 km for our UAS), increased endurance of small UAS is a requirement and the monitoring strategy should be adapted according to the sampling plan. Also, the UAS is as expensive as a second-hand light aircraft. However the logistic and flight implementation are easier, the running costs are lower and its use is safer. With technological evolution making civil UASs more efficient, they will be able to compete with light aircrafts for aerial wildlife surveys. [less ▲]

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See detailMid-infrared prediction of cheese yield from milk and its genetic variability in first-parity cows
Colinet, Frédéric ULg; Troch, Thibault ULg; Vanden, Bossche et al

Conference (2013, August 29)

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See detailDocument/text relationship in Ramses: the principles
Sojic, Nathalie ULg

Conference (2013, August 28)

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See detailGenetic effects of heat stress on milk yield and MIR predicted methane emissions of Holstein cows
Vanrobays, Marie-Laure ULg; Gengler, Nicolas ULg; Kandel, Purna Bhadra ULg et al

Conference (2013, August 28)

Dairy cows both contribute to and are affected by climate change. Breeding for heat tolerance and reduced methane (CH4) emissions is a key requirement to mitigate interactions between dairy cows and ... [more ▼]

Dairy cows both contribute to and are affected by climate change. Breeding for heat tolerance and reduced methane (CH4) emissions is a key requirement to mitigate interactions between dairy cows and climate change. This study was aimed to estimate genetic variation of milk yield and CH4 emissions over the whole trajectory of temperature humidity index (THI) using a reaction norm approach. A total of 257,635 milk test-day (TD) records and milk mid-infrared (MIR) spectra from 51,782 Holstein cows were used. Data were collected between January 2007 and December 2010 in 983 herds by the Walloon Breeding Association (Ciney, Belgium). The calibration equation developed by Vanlierde et al. (Abstract submitted to EAAP 2013; R² of cross-validation=0.70) was applied on the spectral data in order to predict CH4 emissions values (g CH4/d). These values were divided by fat and protein corrected milk yield (FPCM) defining a new CH4 trait (g CH4/kg of FPCM). Daily THI values were calculated using the mean of daily values of dry bulb temperature and relative humidity from meteorological data. Mean daily THI of the previous 3 days before each TD record was used as the THI of reference for that TD. Bivariate (milk yield and a CH4 trait) random regression TD mixed models with random linear regressions on THI values were used. Estimated average daily heritability for milk yield was 0.17 and decreased slightly at extreme THI values. However, heritabilities of MIR CH4 traits increased as THI values increase: from 0.10 (THI=28) to 0.14 (THI=75) for MIR CH4 (g/d) and from 0.14 (THI=28) to 0.21 (THI=75) for MIR CH4 (g/kg of FCPM). Genetic correlations between milk yield and MIR CH4 (g/d) ranged from -0.09 (THI=28) to -0.12 (THI=75) and those between milk yield and MIR CH4 (g/kg of FPCM) from -0.75 (THI=28) to -0.71 (THI=75). These results showed that milk production and CH4 emissions of dairy cows seemed to be influenced by THI. [less ▲]

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See detailHolocene dust record in a NW European peat bog: A multiproxy approach
Allan, Mouhamd ULg; LE ROUX, gael; VERHEYDEN, SOPHIE et al

Conference (2013, August 28)

Dust deposition in southern Belgium is estimated from the geochemical signature of an ombrotrophic bog. The analyses of Rare Earth Elements (REE) and lithogenic element concentrations as well as Nd ... [more ▼]

Dust deposition in southern Belgium is estimated from the geochemical signature of an ombrotrophic bog. The analyses of Rare Earth Elements (REE) and lithogenic element concentrations as well as Nd isotopes were performed by HR-ICP-MS and MC-ICP-MS respectively, in a  6 m peat section representing 5300 years, from 30 BC to 5300 BC dated by the 14C method. REE concentration variations in peat samples were used as a dust proxy and the Nd isotopes to trace the sources. Peat humification and testate amoebae were used to evaluate hydroclimatic conditions. The range of dust deposition varied from 0.03 to 4 g m-2 yr-1. The highest dust fluxes were observed from 800 to 600 BC, and from 3200 to 2800 BC and correspond to cold periods. The Nd values show large variability, between -5 and –13, identifying three major sources of dust: local soils, distal volcanic and desert particles. By comparing our results with the dust recorded in other peat bogs and ice cores from different latitudes, we evidence that the Misten peat is a valid archive for dust deposition. [less ▲]

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See detailA small overview of available computer software to support computerized adaptive testing
Magis, David ULg

Conference (2013, August 27)

Computerized adaptive testing (CAT) is becoming a central tool for testing and assessment. It offers many advantages over fixed (“paper-and-pencil”) methods, such as individualized assessment, reduction ... [more ▼]

Computerized adaptive testing (CAT) is becoming a central tool for testing and assessment. It offers many advantages over fixed (“paper-and-pencil”) methods, such as individualized assessment, reduction of fraud, and straightforward estimation of proficiency levels. CAT has been studied for decades and remains an up-to-date research field in psychometrics and educational science. Practical CAT administration, however, is less frequently considered in such studies. Assigning CAT to respondents requires both the sufficient availability of computer machines, and the use of a powerful and easy-to-use CAT software. With the fast increase of computer resources at moderate cost, the availability of computer machines is becoming a less central, yet important, issue in the practical assessment of CAT tests. The choice of an accurate CAT software, on the other hand, should be guided by its flexibility, its underlying statistical modeling, and its user-friendly potential. According to the type of research or data analysis, some CAT software might be preferred to another. It is therefore important for the researcher or the clinician to know about the current availability of such software, in line with current research and practice in the CAT framework. Moreover, these software should allow enough flexibility to incorporate updates and new theoretical developments, such as e.g., new rules for next item selection. This talk proposes a simple and user-oriented presentation of several CAT software that are currently available. The software to be presented are: the Firestar software (Choi, 2009), the R package catR (Magis & Raîche, 2012), the R package catIrt (Nydick, 2012) and the CAT web-platform Concerto (Kosinski & Rust, 2011). The first three are non-commercial software, while Concerto is a web interface between end users (willing to develop computerized assessment tests) and catR (as underlying routine software). Both R packages are written to be most useful for researchers, without end-user interface, and are therefore less appealing for applied researchers who are not familiar with R. Yet, they offer flexible solutions by means of many options to optimize the design of the test and generate many response patterns for further analyses. Also, they can be easily integrated as sub-routines for more sophisticated CAT software. Firestar provides a user interface and makes all necessary computations with underlying R code. This talk aims at focusing on freely available CAT software. For this reason, only the four aforementioned programs will be presented, although it exists other, commercial CAT software such as e.g., the CATSim software (Assessment Systems Corporation, 2012). The different CAT software are briefly presented and their advantages and drawbacks, flexibility and usefulness are compared, mostly from the point of view of the applied researcher and clinician. The following criteria were retained for objective comparison: (a) their main goal of application; (b) the type of data and IRT modeling they can deal with; (c) the type of users they are focusing on; (d) their operating options; (e) their availability and flexibility for further improvements. A small demonstration of the R package catR will be proposed optionally, depending on time limitation. References Assessment Systems Corporation (2012). CATSim: Comprehensive simulation of computerized adaptive testing. St. Paul, MN. URL: http://www.assess.com/. Choi , S. W. (2009). Firestar: Computerized adaptive testing simulation program for polytomous item response theory models. Applied Psychological Measurement, 33, 644-645. Kosinski, M., & Rust, J. (2011). The development of Concerto: An open source online adaptive testing platform. Paper presented at the International Association for Computerized and Adaptive Testing (IACAT), Pacific Grove, CA. Magis, D., & Raîche, G. (2012). Random generation of response patterns under computerized adaptive testing with the R package catR. Journal of Statistical Software, 48, 1-31. Nydick, S. W. (2012). catIrt: An R package for simulating IRT-based computerized adaptive tests. R package version 0.3-0. [less ▲]

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See detailSea floor morphology of north-western Gulf of Corinth (Greece): combined impacts of Late Quaternary eustatism and active tectonics
Beckers, Arnaud ULg; Beck, Christian; Hubert, Aurelia ULg et al

Conference (2013, August 27)

Two high-resolution seismic reflection surveys (single channel sparker) were performed in the western part of the Gulf of Corinth. aboard HCMR’s R/V ALKYON, within the frame of SISCOR ANR Project. This ... [more ▼]

Two high-resolution seismic reflection surveys (single channel sparker) were performed in the western part of the Gulf of Corinth. aboard HCMR’s R/V ALKYON, within the frame of SISCOR ANR Project. This intra-continental marine basin is related to Late Cenozoic to Present extension separating “continental” Greece from Peloponnese. The connection of this active rift with the Ionian Sea (Mediterranean) is nowadays a 62 m deep sill, a situation which implies possible separations during low stands of global sea level, especially the last ones (MIS 2 and MIS 6). The western part of the Gulf, which is the most seismo-tectonically active part, appears as a transfer zone with both normal and strike slip faulting, identified through a dense grid of seismic lines. As a consequence, the offshore northern edge between the Mornos River delta and the Trizonia island shows a complex morphology due to the interaction between these structures, huge terrigenous feeding, deltaic development and sediment failures. Pre-Quaternary basement (Hellenids) was partly submitted to aerial erosion and paleodeltas are superimposed on the induced relief, visible at a depth of 110 m below Present sea level. The paleovalleys are filled with onlapping layered sediments, affected by several WSW-ENE and W-E oriented faults, part of them still active. An attempt to decipher both sources of relief genesis and evolution is presented. Beside, location and slip rate of active faults are discussed. [less ▲]

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See detailBedload dynamics in gravel bed rivers
Houbrechts, Geoffrey ULg; Hallot, Eric ULg; Peeters, Alexandre ULg et al

Conference (2013, August 27)

The aim of this research was threefold: 1) to improve the values of bedload mobilisation discharge in gravel bed rivers, 2) to determine the bedload velocity over the short and long term and 3) to ... [more ▼]

The aim of this research was threefold: 1) to improve the values of bedload mobilisation discharge in gravel bed rivers, 2) to determine the bedload velocity over the short and long term and 3) to quantify bedload transport and to examine bedload discharge in relation to the stream power and to the excess stream power. Since 2006, we used the PIT-tag technique in order to mark pebbles from Ardennian rivers. Ten rivers of different geomorphological properties were fitted out with PIT-tags (in 18 different sites) and 67 surveys were carried out after hydrological events. These data allow a valuable relationship between the stream power during floods and the size of the biggest elements mobilised to be proposed. This relation is obtained for medium sized rivers (50-200 km²) with bed material composed of gravel (D50 between 2 and 10 cm). Furthermore, we also obtained good relationships between the average transport distance and the excess of stream power reached during the hydrological events. In order to estimate the bedload virtual velocity over a longer time scale, we applied these relationships to the hydrological events recorded by gauging stations over more than 30 years. We obtained values of virtual velocity which are between 2 km/century for a low energy river with a sinuous bed and well developed riffle-pool sequences (Rulles River – 20 W/m² at Qb) and 11 km/century in a more powerful river with a straight channel (Aisne River – 100 W/m² at Qb) and a sub-flat bed. The propagation velocity of bedload is therefore influenced by the energy available. However, it is also necessary to take into account the river pattern, the characteristics of the armoured layer and the presence of potential trapping sites. [less ▲]

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See detailMULTIPHYSICS MODELING OF CELL/MATRIX GROWTH ON 3D STRUCTURES.
Guyot, Yann ULg; Papantoniou, Ioannis; Chai, Yoke Chin et al

Conference (2013, August 26)

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See detailGenetic evaluation of calving ease for Walloon Holstein dairy cattle
Vanderick, Sylvie ULg; Troch, Thibault ULg; Gillon, Alain et al

Conference (2013, August 25)

Calving complications have an incidence on the economic profitability of dairy herds. In the Walloon Region of Belgium, calving ease data recording is being done on voluntary basis since 2000. This allows ... [more ▼]

Calving complications have an incidence on the economic profitability of dairy herds. In the Walloon Region of Belgium, calving ease data recording is being done on voluntary basis since 2000. This allows now the implementation of a genetic evaluation of Holstein dairy cattle addressing the need of dairy breeders to select bulls in order to reduce frequency of calving problems. Calving ease scores were analyzed using univariate animal linear models, which were fitted with the genetic correlation between direct and maternal additive genetic effects either estimated or constrained to zero. Variance components and related genetic parameters were estimated from a dataset including 33,155 calving records. Included in the models were fixed season effects, fixed herd effects and fixed sex of calf*age of dam classes*group of calvings interaction effects, random herd*year of calving effects, random maternal permanent environment effects, and random animal direct and maternal additive genetic effects. For both models, direct and maternal heritabilities for calving ease were about 8% and about 2%, respectively. Genetic correlation between direct and maternal additive effects was found to be non-significantly different from zero. So, an animal linear model with genetic correlation between direct and maternal effects constrained to zero was adopted for the routine genetic evaluation of calving ease for Walloon Holstein dairy cattle. This model was validated by Interbull in January 2013 and, since April 2013, the Walloon Region of Belgium has officially participated to the international MACE evaluation for calving traits. [less ▲]

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See detailModeling the influence of oxygen in delayed bone fracture healing.
Carlier, Aurélie ULg; Geris, Liesbet ULg; Van Oosterwyck, Hans

Conference (2013, August 25)

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See detailNA2RE Project—The new atlas of amphibians and reptiles: new compilation and online system
Sillero, Neftalí; Campos, João; Oliveira, Marco Amaro et al

Conference (2013, August 24)

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See detailEnvironmental correlates of paedomorphosis and metamorphosis in palmate newts
Denoël, Mathieu ULg; Ficetola, G. Francesco

Conference (2013, August 23)

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See detailEnergetical aspects of solar-like oscillations in red giants
Grosjean, Mathieu ULg; Dupret, Marc-Antoine ULg

Conference (2013, August 23)

CoRoT and Kepler observations of red giants reveal a large variety of spectra of non- radial solar- like oscillations. Up to now we understood pretty well the frequency patterns for the different global ... [more ▼]

CoRoT and Kepler observations of red giants reveal a large variety of spectra of non- radial solar- like oscillations. Up to now we understood pretty well the frequency patterns for the different global properties or different evolutionary stages of the stars. Here we are interested in the theoretical predictions for the two other components of a power spectra (the linewitdths and the heights). The study of energetic aspects of these oscillations is of great importance to predict the peak parameters in the power spectrum. I will discuss under which circumstances mixed modes are detectable for a large variety of red-giant stellar models, with emphasis on the effect of the evolutionary status of the star along the red-giant branch, for a wide range of stellar masses (from 1 to 2M⊙ ) on theoretical power spectra. [less ▲]

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See detailDoes foraging plasticity favours adaptation to new habitats in fire salamanders? Preliminary data
Manenti, Raoul; Denoël, Mathieu ULg; Ficetola, Gentile Francesco

Conference (2013, August 23)

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See detailHow do music experts and non-experts evaluate the vocal accuracy of operatic singing voices?
Larrouy, Pauline ULg; Nowak, Marion; Morsomme, Dominique ULg

Conference (2013, August 22)

Professional singers are expected to sing in tune. However, when an operatic singing technique is employed, the objective measurement of the vocal accuracy (i.e. pitch interval deviation) shows ... [more ▼]

Professional singers are expected to sing in tune. However, when an operatic singing technique is employed, the objective measurement of the vocal accuracy (i.e. pitch interval deviation) shows particularly low scores, whatever the melody performed. This study focuses on the perceptual judgment of operatic voices in order to observe the evaluation process of singing voice accuracy by music experts and non-experts. In addition, this study aims to better understand the relationship between the subjective and objective measurements of operatic singing voices. 22 music experts and 22 non-experts paired in age and gender participated in a test and a retest (8 to 15 days in between). Fourteen sung performances performed by professional operatic singers were presented with a pairwise comparison paradigm. The participants were asked to indicate the most “in tune” melody for each pair (N = 91). The performances obtained thus a ranking by each judge. In addition, the 14 sung performances were objectively analyzed in order to confront the objective measurement of singing voice accuracy with the perceptual rating of the judges. Computing the variances of rank differences between the test and the retest, we observed that 20 music experts and 16 non-experts were consistent in their judgments. Among each group, the correlations between consistent raters were positive. However, 67.38% of these correlations were significant (p < .05) for the music experts whereas only 42.10% were significant for the non-experts. In addition, no relationship occurred between the objective measurements (from 9.5 to 115.5 cents, M = 40.57, SD = 34.42) and the perceptual ratings, except for two music experts. This study highlights the consistency of a judge when rating operatic singing voices and the difference between music experts and non-experts concerning the inter-judges reliability. Despite the fact that the majority of the music experts used similar strategies to evaluate the vocal accuracy of operatic voices, their judgment was obviously not linked with the objective measurement of vocal accuracy. This finding supports the tolerance of music expert listeners regarding the singing voice accuracy of operatic singers. Furthermore, this study provides some directions about the perception of operatic singing voices, which are particularly complex. [less ▲]

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See detailTailor made amphiphilic copolymers for the design of smart drug delivery systems
Riva, Raphaël ULg; Cajot, Sébastien; Jérôme, Christine ULg

Conference (2013, August 21)

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See detailExtent of intra-population functional variability along a local environmental gradient for four calcareous grasslands species
Harzé, Mélanie ULg; Monty, Arnaud ULg; Mahy, Grégory ULg

Conference (2013, August 19)

In the last few years, an increasing body of evidence has highlighted the role of functional traits as reliable predictors of species resistance to disturbance and response to environmental gradients ... [more ▼]

In the last few years, an increasing body of evidence has highlighted the role of functional traits as reliable predictors of species resistance to disturbance and response to environmental gradients. However, most studies focused on functional comparisons at the interspecific level while intraspecific functional trait variation has received remarkably little attention. As intraspecific traits variability is a necessary condition for species to adapt to environmental changes, studying intraspecific functional traits variation along environmental gradients is a major issue in a context of global change. The aim of our study was to evaluate the extent of intraspecific functional variability of four species along an environmental gradient of water stress at a local scale and to compare species response to the gradient. Calcareous grasslands species are present along a xeric gradient from mesophilous to xerophilous grasslands. Changes of exposure, slope and soil depth lead to differences of water availability for plants along the gradient. We measured the maximum vegetative height (MVH), the specific leaf area (SLA, one side area of a fresh leaf divided by its oven-dry mass) and the leaf dry matter content (LDMC, leaf oven-dry mass divided by its water-saturated fresh mass) on randomly selected individuals along a gradient of xericity on three study sites located in south Belgium. Functional traits were measured on about 60 individuals per site and per species. The soil depth was measured around each individual. The exposure and the slope were measured in order to calculate a heat load index for each individual. The extent of local intraspecific functional variability of our data was compared to data covering the species European range. Results are species dependent but for some study species intraspecific functional variability at local scale is not negligible compared to European data. Species functional responses to the gradient (soil depth and heat load index) showed a decrease in SLA and MVH and an increase in LDMC with increasing xericity for all study species. Response extent was species dependent. Main implications for species resistance to disturbance and climate change adaptation will be discussed. [less ▲]

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See detailBalancing the freedom of academia and security interests : an impossible objective ?
Michel, Quentin ULg

Conference (2013, August 19)

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See detailEvolutionary history of Leopoldamys neilli, a karst endemic rodent in Southeast Asia, and implications for its conservation
Latinne, Alice ULg; Waengsothorn, Surachit; Michaux, Johan ULg

Conference (2013, August 15)

In this study, we have investigated the phylogeography of Leopoldamys neilli, a Murinae rodent species endemic to limestone karsts in Southeast Asia, on the basis of mitochondrial and nuclear markers ... [more ▼]

In this study, we have investigated the phylogeography of Leopoldamys neilli, a Murinae rodent species endemic to limestone karsts in Southeast Asia, on the basis of mitochondrial and nuclear markers. Both mitochondrial and nuclear markers support a large-scale population structure of four main groups within L. neilli and a strong finer structure within each of these groups. A deep genealogical divergence among geographically close lineages is observed and denotes a high population fragmentation. Our findings suggest that the current phylogeographic pattern of this species results from the fragmentation of a widespread ancestral population and that vicariance has played a significant role in the evolutionary history of L. neilli during Plio-Pleistocene. This study revealed an unexpected high level of intraspecific diversity within L. neilli. Consequently, the four main L. neilli population groups should be considered as four distinct Evolutionarily Significant Units (ESUs) and require appropriate management and conservation plans. [less ▲]

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See detailPitch analysis workshop
Larrouy, Pauline ULg

Conference (2013, August 13)

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See detailThe evaluation of singing voice accuracy: Are we good judges even if we are not musicians?
Larrouy, Pauline ULg; Roig-Sanchis, Virginie; Morsomme, Dominique ULg

Conference (2013, August 08)

A previous study highlighted that objective and subjective measurements of vocal accuracy are highly correlated when the rating is done by musicians and that 81% of their variance was explained by the ... [more ▼]

A previous study highlighted that objective and subjective measurements of vocal accuracy are highly correlated when the rating is done by musicians and that 81% of their variance was explained by the pitch interval deviation and the number of tonality modulations (Larrouy-Maestri, Lévêque, Schön, Giovanni, & Morsomme, 2013). However, the general audience is not expert in music. This study aims to observe the vocal accuracy assessment done by non musicians. Eighteen non musicians were asked to rate on a 9-point scale the global pitch accuracy of 166 vocal performances sung by untrained singers. This database was presented two times (T1 and T2) in a random order. The sung performances were objectively analyzed regarding three criteria: pitch interval deviation, number of tonality modulations and number of contour errors. The results show an intraclass correlation coefficient of .89 (p < .01) among the non experts and a mean intra-judges Spearman correlation of .66 (SD = .06) between T1 and T2. There is also a significant correlation between the acoustic measurements and the mean ratings (r(166) = .809; p < .01), with higher scores for accurate performances. Confronted with the music experts of the previous study, the judgment of the non experts correlated with the musicians ratings (r(166) = .840; p < .01). However, a Mann Whitney test showed that the rating of non experts was globally more severe than the experts one (p = 009). In addition, the regression analysis showed that only the pitch interval deviation criterion was considered in their judgment, explaining 66% of the variance of the judges. This study highlights the reliability and the objectivity of non musicians in the vocal accuracy assessment. Moreover, an effect of music expertise is observed concerning the severity of the rating and the vocal accuracy assessment process. [less ▲]

Detailed reference viewed: 48 (4 ULg)
See detailTaste analysis. How practice in an industrial and scientific context shapes sturdy sensory categories.
Vangeebergen, Thomas ULg

Conference (2013, August 08)

Sensory analysis presents the particular characteristic to be placed in a crossroad, especially when it is about taste. Sensory, which is the most of the time the space of subjective and hedonic judgments ... [more ▼]

Sensory analysis presents the particular characteristic to be placed in a crossroad, especially when it is about taste. Sensory, which is the most of the time the space of subjective and hedonic judgments, meets Science, which has the main goal to establish an objective truth, through sturdy and stable categories. I followed several types of sensory expert panels, and among them a panel who has the mission to discriminate different sorts of carrots and define their respective sensory profile. The judges were specifically teached and trained to taste and analyze carrots. I was interested to observe the period of training to understand how those people had acquired their expertness. In this presentation, I would tempt an analysis of how participants build themselves the tools and tricks to perform a best organoleptic perception, and how they go beyond the rules and formal process to answer to the forms. [less ▲]

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See detailPitch matching, melodic singing, and vocal-motor control
Hutchins, Sean; Larrouy, Pauline ULg; Peretz, Isabelle

Conference (2013, August 08)

Poor singing ability can be caused by poor pitch perception or by poor vocal-motor control. Many prior studies have tried to examine this relationship, but one factor that often fails to be taken into ... [more ▼]

Poor singing ability can be caused by poor pitch perception or by poor vocal-motor control. Many prior studies have tried to examine this relationship, but one factor that often fails to be taken into account is the timbre of the target to be matched. Here, we compare accuracy in instrumental and vocal pitch matching paradigms, designed such that each participant’s own voice serves as both the target and the response. Participants (nonmusicians) matched their previously recorded voice on a slider, designed to play back their voice at different pitch levels depending on the location of a finger press on a continuous dimension. They also matched single pitches with their voice, and sang a familiar melody (“Happy Birthday”) for comparison to the single pitch matching tasks. The nonmusicians were significantly better at instrumental pitch matching than vocal pitch matching, indicating that vocal-motor control is an important limiting factor on singing ability. There were significant correlations between the melodic singing ability and vocal pitch matching, but not instrumental pitch matching. People with higher quality voices tended to be more accurate with pitch in melodies. These results demonstrate that single pitch matching tasks can be useful in measuring general singing abilities, and further confirm the importance of vocal-motor control in determining singing ability. [less ▲]

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See detailReference populations for shoulder studies should be selected carefully
Schwartz, Cédric ULg; Denoël, Vincent ULg; Bruls, Olivier ULg et al

Conference (2013, August 06)

To assess various shoulder pathologies / treatments, non pathological populations are often used as references. However, some factors may influence significantly the scapular kinematics within a healthy ... [more ▼]

To assess various shoulder pathologies / treatments, non pathological populations are often used as references. However, some factors may influence significantly the scapular kinematics within a healthy population and consequently alter the final kinematic evaluation. Results of 3D shoulder assessment found in this study show that small (≈5°) but significant differences exist between gender and between the dominant and non-dominant arms. Therefore the populations used for referential data should be selected carefully. [less ▲]

Detailed reference viewed: 66 (12 ULg)
See detail"Bi-textual" Poetics: Investigating Form in Chris Abani's Becoming Abigail
Tunca, Daria ULg

Conference (2013, August 05)

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See detailSpecies richness and speciation in the genus Lepilemur in northwestern Madagascar
Wilmet, Leslie ULg; Vermeulen, Cédric ULg; Beudels-Jamar, Roseline et al

Conference (2013, August 05)

Sportive lemurs of the genus Lepilemur are small, nocturnal folivorous lemurs that are exclusively arboreal and generally have small distribution ranges. Owing to these characteristics, they are ... [more ▼]

Sportive lemurs of the genus Lepilemur are small, nocturnal folivorous lemurs that are exclusively arboreal and generally have small distribution ranges. Owing to these characteristics, they are particularly negatively affected by deforestation and habitat fragmentation, which is reflected by the recent uplisting of many of the 26 Lepilemur species into one of the threatened categories of the IUCN Red List. The main aim of this study is to understand the evolutionary mechanisms underlying species richness and speciation processes of the genus Lepilemur in northwestern Madagascar, and to test the predictions of the Inter-River-System biogeographic model of lemur distribution patterns proposed by Olivieri et al. (2007). This study focuses particularly on three Lepilemur taxa: L. sahamalazensis, L. dorsalis and L. mittermeieri, which have their distribution ranges in the northwestern regions of Sofia and Diana. The objectives are to determine their exact distributions, currently unknown; to assess the allopatry or parapatry for L. dorsalis and L. mittermeieri; and to explain the barrier between these two taxa if it exists. A second fundamental aspect of the project consists in the development of noninvasive tools, based on species-specificity of bio-acoustic structures, which will allow species identification in the field. This paper discusses the results from a two-month preliminary field season, conducted from 1st April to 31st May 2013 in order to explore the mainland forests located between the Andranomalaza (Maetsamalaza) and Maevarano rivers. We established the presence/absence of Lepilemur in different forest fragments of this poorly-known area and collected information about land use classes and land use change using remote sensing techniques. [less ▲]

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See detailLake Kivu: food web structure and energy flows
Descy, J-P; Sarmento, H; Isumbisho, P et al

Conference (2013, August 04)

Detailed reference viewed: 31 (0 ULg)
See detailProperty, inheritance conflicts and family dynamics in Benin
Andreetta, Sophie ULg

Conference (2013, August)

Detailed reference viewed: 14 (2 ULg)