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See detailL'Internet en politique au Cameroun: usages, cyberprésence et enjeux démocratiques
Beche, Emmanuel ULg

Conference (2013, June 13)

Depuis 1997, l’espace socio-public camerounais « devient média » (Blondeau, 2007) de plus en plus. Dans ce processus, la politique ne fait pas exception. Au contraire, les partis et leurs leaders ... [more ▼]

Depuis 1997, l’espace socio-public camerounais « devient média » (Blondeau, 2007) de plus en plus. Dans ce processus, la politique ne fait pas exception. Au contraire, les partis et leurs leaders investissent l’Internet, le territorialisent et en utilisent les outils : sites web et blogs, forums, facebook, twitter, myspace, etc. Cela apparaît techno-politiquement innovant dans un contexte certes marqué par le multipartisme, la libéralisation de l’espace sociopolitique et l’avènement des NTIC, mais qui présente aussi des déficits. Politiquement, on note une opposition en panne, des élections contestées et une faible culture de participation politique. (Ahmadou, 2006; Mack-Tit, 2007; Kokoroko, 2009). Au plan sociotechnique et économique, le taux de pénétration de l’Internet (4%) et le pouvoir d’achat de 70% de la population restent faibles. Cela limite l’accès au Net (Bâ, 2003) mais n’empêche pas son usage et sa représentation politiques. Nous avons étudié cet usage et cette représentation au niveau macro-politique en nous limitant aux acteurs institutionnels. Nous avons alors remarqué que leur cyberprésence c’est-à-dire la façon dont ils s’approprient l’espace numérique tend à reproduire leurs rapports de force dans le champ politique classique (Ovadia, 2011). Les usages politiques qu’ils y développent traduisent davantage la diffusion de l’information que l’interactivité et la mobilisation (Greffet et Wojcik, 2008). Dans ce contexte, les enjeux démocratiques de net-politique varient selon le caractère « opposant » ou « au pouvoir » des acteurs (Greffet, 2011). Si pour le parti au pouvoir, il s’agit de dominer tous les espaces d’expression politique, pour les opposants, le but est de trouver une visibilité nationale et de se faire entendre à l’international. Pour mener ce travail, nous avons examiné trois points : la cyberprésence des acteurs institutionnels, le contenu de leurs sites web et blogs et celui de leurs pages facebook. Nous situant dans la perspective de la communication médiatisée par ordinateur (Yanoshevsky, 2010), nous avons alors utilisé les indicateurs que Bastien et Greffet (2009) et Béché (2011) ont utilisés dans leurs travaux sur la net-campagne. [less ▲]

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See detailEmotions and cognitions. The evolution of the theory of emotions in the first Husserl
Gyemant, Maria ULg

Conference (2013, June 12)

In the Fifth Logical Investigation, after a series of objections to Brentano’s thesis that presentations constitute the most basic type of mental acts, Husserl offers the alternative of a fundamental ... [more ▼]

In the Fifth Logical Investigation, after a series of objections to Brentano’s thesis that presentations constitute the most basic type of mental acts, Husserl offers the alternative of a fundamental distinction between objectifying and non-objectifying mental acts. Objectifying acts include the first two Brentanian classes: presentations and judgments. Thus the class of emotions is singled out as the typical model for non-objectifying acts. However, Husserl changes his mind on this issue later on. We find a new and rather surprising theory of emotions in his Ideas I of 1913. In the §117 for instance, Husserl states clearly that all acts, emotions included, are objectifying because they all constitute objects. The only difference between emotions and cognitions is that emotions constitute values as their objects. Since all acts are objectifying, the difference is now between kinds of objects rather than kinds of acts. It seems though that the role values play in our mental life is more complicated. Not only are they dependent objects constructed from objects of simple presentations or judgments, but they are also the sort of objects that can motivate other acts. So, while emotions are in Husserl always dependent on cognitions, since wanting something necessarily supposes, as in Brentano, a previous presentation of that thing, certain emotions can also play a foundational role for cognitions. Hence the question addressed in this paper: is the relation between emotions and cognitions a symmetrical one since both can play the role of foundational act for the other? And if this is the case what is the specificity of emotions as mental acts and how can they be distinguished from cognitions? [less ▲]

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See detailThree cases of structural and procedural barriers to return to work in the Belgian health system.
Mairiaux, Philippe ULg

Conference (2013, June 12)

Three cases of structural and procedural barriers to RTW in the Belgian health system • Access to “part-time return to work”: past (before 2013) and present procedures; which improvements are brought by ... [more ▼]

Three cases of structural and procedural barriers to RTW in the Belgian health system • Access to “part-time return to work”: past (before 2013) and present procedures; which improvements are brought by the regulation change effective in April 2013? • “Pre-return to work visit” by the occupational physician: theoretical advantages of this visit introduced in the labour law in 2004; why is it poorly implemented? what are the actual barriers to access it? what changes should be brought to lower the access threshold? • How to implement in the Belgian system a procedure of therapeutic RTW like the Quebec RTT system (a period of trial RTW without productivity requirements and with no costs to the employer)? Exercise case to be solved by the WDP trainees. Reference: Mairiaux et al. National study report on return to work after a long sickness absence (in Dutch): http://www.werk.belgie.be/moduleDefault.aspx?id=37079 [less ▲]

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See detailIntroduction to Symposium on Socio-political Challenges in Work Disability Prevention
MacEachen, Ellen; Tompa, Emile; Mairiaux, Philippe ULg

Conference (2013, June 12)

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See detailINFLUENCE OF DISSOLVED MACROMOLECULES ON ADHERENCE OF PARTICULATE SOILS
Toure, Yetioman ULg; Sindic, Marianne ULg; Rouxhet, G. Paul

Conference (2013, June 12)

Polysaccharides, proteins, lipids and other biopolymers are the main components of food and pharmaceutical mixtures and may influence interactions at interfaces and thus fouling and cleaning. In this ... [more ▼]

Polysaccharides, proteins, lipids and other biopolymers are the main components of food and pharmaceutical mixtures and may influence interactions at interfaces and thus fouling and cleaning. In this study, quartz particles (10 to 30µm) were used as a model soil for examining the effect of dissolved proteins on the cleanability of substrates after soiling and drying. Glass and stainless steel pretreated by UV-Ozone (StSteel-UVO) were used as model hydrophilic substrates, while hydrophobic substrates were represented by stainless steel cleaned with ethanol (StSteel-Eth) and polystyrene. BSA and β-LGB were used as proteins. The quartz suspensions used for soiling (150g/L) were prepared in pure water and in a solution of each protein (8g/l). After soiling and drying, the cleanability was evaluated using a radial-flow cell, with pure water as the cleaning fluid. When soiling was made with a quartz suspension in pure water, the soil adherence increased with substrate hydrophilicity. This may be explained by better droplet spreading and increase of the capillary forces created upon drying. The presence of proteins in the suspension used for soiling hydrophilic substrates (Glass and StSteel-UVO), decreased the adherence of quartz particles. Its effect was less marked and tended to be opposite for less hydrophilic substrates (StSteel-Eth, Polystyrene). The comparison of different substrates and two proteins showed that the adherence cannot be explained by a simple relation with the contact angle. Other factors may be the solution surface tension itself and the protein behavior at the interfaces created by drying and by rehydratation during cleaning. When considering the influence of substrate on soiling, it must be kept in mind that high surface energy solids (metals, oxides) are readily contaminated in contact with air and lose their hydrophilicity. Amazingly this may improve the substrate behavior regarding cleanability with respect to particulate soil. [less ▲]

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See detailVécu des conjoints face au cancer de leur partenaire - Besoins psychosociaux et dimensions du rôle de proche aidant principal
Wagener, Aurélie ULg

Conference (2013, June 11)

Cancer causes cognitive, emotional and behavioral reactions in patients who are suffering from it, but what about their spouses? This study aims to describe, among spouses in good physical health ... [more ▼]

Cancer causes cognitive, emotional and behavioral reactions in patients who are suffering from it, but what about their spouses? This study aims to describe, among spouses in good physical health, different facets of their caregiver's role, their emotional distress and their psychosocial needs (PN). Participants were recruited with the prior consent of the patient. These assessments were administered: sociodemographic questionnaire, Hospital Anxiety and Depression Scale, Caregiver Reaction Assessment, Perception of Inequity, Psychosocial Needs Inventory. Thirty-seven spouses (23 men, 14 women) participated in this study. Main scores highlight a positive self-esteem as a caregiver and a high level of anxiety. PN concern especially interactions with healthcare professionals, information and support. [less ▲]

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See detailRisk Horizon and Expected Market Returns
Hübner, Georges ULg; Lejeune, Thomas ULg

Conference (2013, June 08)

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See detailActualité des manuscrits et études génétiques de Sartre : les années 1950
Cormann, Grégory ULg

Conference (2013, June 07)

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See detailProposition de nouveaux indices de détection de patrons de réponses inappropriés dans le contexte des enquêtes et des épreuves d’évaluation des apprentissages
Béland, Sébastien; Raîche, Gilles; Magis, David ULg

Conference (2013, June 07)

Il n’est pas rare de voir des étudiants répondre de façon inappropriée à une épreuve d’évaluation comportant des items à réponses choisies. Par exemple, certains individus peuvent tricher alors que ... [more ▼]

Il n’est pas rare de voir des étudiants répondre de façon inappropriée à une épreuve d’évaluation comportant des items à réponses choisies. Par exemple, certains individus peuvent tricher alors que d’autres peuvent tenter de se sous-classer intentionnellement à un examen. Plusieurs approches ont été développées pour faire la détection de ce type d’étudiants. À ce jour, l’approche la plus prometteuse est l’utilisation d’indice de détection de type person‐fit (Meijer et Sijtsma, 2001). L’indice de détection lz (Drasgow, Levine et Williams, 1985) est fort probablement le plus utilisé et le plus connu d’entre tous. Malheureusement, cet indice est fortement affecté par le fait que l’habileté des étudiants est estimée et non pas réelle ; ce qui peut biaiser son calcul (Molenaar et Hoijtink, 1990). Pour pallier ce problème, Snijders (2001) a proposé une correction qui permet de diminuer considérablement le biais associé à la moyenne et à la variance de l’indice lz. Dans le cadre de notre projet doctoral, nous nous inspirerons de la suggestion de Snijders (2001) pour corriger deux autres indices de détection de patrons de réponses inappropriés : l’infit mean square (u) et l’outfit mean square (w). À cette fin, nous utiliserons une approche monte carliste afin d’investiguer plus en détails l’erreur de type 1 et la puissance de ces autres indices. Nos résultats préliminaires, que nous présenterons lors de cette communication, montrent que ces autres indices corrigés semblent eux aussi plus efficaces que leur version traditionnelle sans correction. [less ▲]

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See detailLes biographies existentielles : le cas Ben Sadok (1957)
Cormann, Grégory ULg

Conference (2013, June 07)

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See detailSur les traces de l'origine de l'art
Krtolica, Igor ULg

Conference (2013, June 07)

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See detailPortrait et imaginaire photographique. Cliché et anti-cliché du Nouveau Roman.
Lorent, Fanny ULg

Conference (2013, June 07)

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See detailMultivariate statistics to understand the geochemical processes induced by groundwater pollution Multi-scale applying
Gesels, Julie ULg; Joniau, Claire; Batlle-Aguilar, Jordi et al

Conference (2013, June 07)

Different hydrogeochemical approaches (classical diagrams, spatial distribution maps, geochemical equations and multivariate statistics) are combined to obtain a global understanding of the ... [more ▼]

Different hydrogeochemical approaches (classical diagrams, spatial distribution maps, geochemical equations and multivariate statistics) are combined to obtain a global understanding of the hydrogeochemical processus at regional and at local scale. [less ▲]

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See detailMythologizing the Past: The Significance of the 'Insignificant' in Kate Grenville’s The Secret River
Joubail, Houda ULg

Conference (2013, June 07)

The recent revelations about Australia’s colonial past, particularly the dispossession and the institutionalized maltreatment of the Aboriginal populations, have provoked an ontological and ... [more ▼]

The recent revelations about Australia’s colonial past, particularly the dispossession and the institutionalized maltreatment of the Aboriginal populations, have provoked an ontological and epistemological malaise affecting notably the sense of historical and cultural legitimacy previously enjoyed by settler Australians. This was a consequence of the work performed by progressive historians who endeavoured to lay bare the brutal foundations of the nation, thus confronting the settlers’ descendants with an array of harrowing truths difficult to reconcile with any foundational myth of pioneering heroism. This context of angst and guilt has given rise to a new literary trend, known as the “Sorry Novels”, which is informed by the wish to come to grips with the trauma of colonization by acknowledging the harm done to the Aborigines. In tackling the vexed issues of dispossession and frontier violence, Kate Grenville’s The Secret River (2005) ostensibly belongs to this well-intentioned literary trend. However, as one examines the novel carefully, one notices that vestiges of a mythologized past presently emerge. From mythologies of convictivism and hardship to pioneerism and ownership, the representation of the colonial past abounds with continuing references to a range of national myths that stand in marked contrast with the author’s avowed keenness to inscribe her novel within the framework of a genuine reconciliation. It is, therefore, my intention in this paper to conduct a close reading of The Secret River with a view to unveiling the unsettling significance of some representational strategies – which might at first glance appear as insignificant – and thus emphasising the ambivalence which characterises Grenville’s discourse about the colonial trauma. [less ▲]

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See detailInnovative Methodology for the Definition of Design Spaces of Chromatographic Methods
Rozet, Eric ULg; Debrus, B; Lebrun, Pierre ULg et al

Conference (2013, June 06)

As defined by ICH [1] and FDA, Quality by Design (QbD) stands for “a systematic approach to development that begins with predefined objectives and emphasizes product and process understanding and process ... [more ▼]

As defined by ICH [1] and FDA, Quality by Design (QbD) stands for “a systematic approach to development that begins with predefined objectives and emphasizes product and process understanding and process control, based on sound science and quality risk management”. A risk–based QbD–compliant approach is proposed for the robust development of analytical methods. This methodology based on Design of Experiments (DoE) to study the experimental domain models the retention times at the beginning, the apex and the end of each peak corresponding to the compounds of a mixture and uses the separation criterion (S) rather than the resolution (RS) as a Critical Quality Attribute. Stepwise multiple linear regressions are used to create the models. The estimated error is propagated from the modelled responses to the separation criterion (S) using Monte Carlo simulations in order to estimate the predictive distribution of the separation criterion (S) over the whole experimental domain. This allows finding ranges of operating conditions that will guarantee a satisfactory quality of the method in its future use. These ranges define the Design Space (DS) of the method. In chromatographic terms, the chromatograms processed at operating conditions within the DS will assuredly show high quality, with well separated peaks and short run time, for instance. This Design Space can thus be defined as the subspace, necessarily encompassed in the experimental domain (i.e. the knowledge space), within which the probability for the criterion to be higher than an advisedly selected threshold is higher than a minimum quality level. Precisely, the DS is defined as “the multidimensional combination and interaction of input variables (e.g., material attributes) and process parameters that have been demonstrated to provide assurance of quality” [1]. Therefore, this DS defines a region of operating conditions that provide prediction of assurance of quality rather than only quality as obtained with traditional mean response surface optimisation strategies. For instance, in the liquid chromatography there is a great difference in e.g. predicting a resolution (RS) higher than 1.5 vs. predicting that the probability for RS to be higher than 1.5 (i.e. P(RS> 1.5)) is high. The presentation of this global methodology will be illustrated for the robust optimisation and DS definition of several liquid chromatographic methods dedicated to the separation of different mixtures: pharmaceutical formulations, API and impurities/degradation products, plant extracts, separation of enantiomers, … [less ▲]

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See detail« Et, moi, je paraphe » : hexis littéraire et figuration photographique
Durand, Pascal ULg

Conference (2013, June 06)

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See detailLes microalgues: un défi énergétique
Franck, Fabrice ULg

Conference (2013, June 06)

Les microalgues sont des micro-organismes photosynthétiques dont la culture commerciale en masse est pratiquée depuis les années '60. Les rendements en biomasse de la culture de microalgues sont ... [more ▼]

Les microalgues sont des micro-organismes photosynthétiques dont la culture commerciale en masse est pratiquée depuis les années '60. Les rendements en biomasse de la culture de microalgues sont supérieurs à ceux de cultures traditionnelles, et elle peut s'effectuer sur des terrains impropres à l'agriculture traditionnelle. Les perspectives d'utilisation de la biomasse microalgale pour la production de biocarburants ont suscité d'importants efforts de recherche au cours des années récentes. Les recherches en cours visent à améliorer les souches d'algues utilisables ainsi que différents aspects des procédés de production, de traitement et d'extraction de la biomasse algale afin d'aboutir à moyen terme à un procédé durable et économiquement viable. [less ▲]

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See detailProcédés et enjeux de l'écriture polémique dans le dossier épistolaire anti-adoptianiste du concile de Francfort (794)
Close, Florence ULg; Veyrard-Cosme, Christiane

Conference (2013, June 06)

Nous proposons une relecture à deux voix – historico-littéraire – des pièces du dossier épistolaire de Francfort attribué à Alcuin. Nous envisagerons les stratégies littéraires et oratoires mises en ... [more ▼]

Nous proposons une relecture à deux voix – historico-littéraire – des pièces du dossier épistolaire de Francfort attribué à Alcuin. Nous envisagerons les stratégies littéraires et oratoires mises en œuvres par Alcuin au nom des évêques francs, d’une part, et de Charlemagne, de l’autre, pour tenter de ramener l’épiscopat espagnol dans le giron romain. Nous tenterons d’affiner notre lecture des positions de chacun, perçues à travers le prisme des mots du diacre anglo-saxon. La confrontation de ces lettres synodales à celles qui ont été envoyées par les évêques espagnols, emmenés par l’archevêque Élipand de Tolède, devrait nous permettre de nourrir une réflexion sur le rôle, l’importance et la puissance stylistique du genre épistolaire, hérité de l’Antiquité, dans deux foyers importants de haute culture de l’époque – la péninsule ibérique et le monde insulaire – ainsi que sur l’impact de cette querelle épistolaire dans le processus de re-développement du genre dans le cadre de la renaissance carolingienne. [less ▲]

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See detailLe financement rural du Niger, élément clé du développement
Andres, Ludovic ULg; Lebailly, Philippe ULg

Conference (2013, June 06)

The Niger economy is mainly based on the rural sector such as the agricultural and breeding activities. Indeed, 80 percent of population is rural. The agricultural financing is a necessary condition to ... [more ▼]

The Niger economy is mainly based on the rural sector such as the agricultural and breeding activities. Indeed, 80 percent of population is rural. The agricultural financing is a necessary condition to increase the livelihood of the rural populations. The paper establishes a typology of the rural financing mode. This typology identifies the strengths and weaknesses of the financing actors (public and private). In conclusion, the real demand isn’t satisfied because the rural financing stay weak on account of the high risk and the higher costs linked with the agricultural activities. [less ▲]

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See detailAnalyse empirique des échanges intra-industriels de l'UEMOA
Soma, Kader; Muller, Aline ULg

Conference (2013, June 05)

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See detailSplendeurs et misères des minorités
Saint-Amand, Denis ULg

Conference (2013, June 05)

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See detailBandgap Measurement by Spectroscopic Ellipsometry for Strained Ge1-xSnx
Shimura, Yosuke; Wang, Wei; Nieddu, Thomas ULg et al

Conference (2013, June 04)

Detailed reference viewed: 158 (7 ULg)
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See detailElectrical Activity of Threading Dislocations and Defect Complexes in GeSn Epitaxial Layers
Gupta, Somya; Simoen, Eddy; Asano, Takanori et al

Conference (2013, June 04)

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See detailVente directe et circuits courts : état des lieux et promotion dans la Province de Namur (Belgique)
Rouchet, François ULg; De Fays, Maud

Conference (2013, June 04)

Detailed reference viewed: 61 (24 ULg)
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See detailComposition and Thickness Dependence of GeSn Growth by Chemical Vapor Deposition
Wang, Wei; Shimura, Yosuke; Nieddu, Thomas ULg et al

Conference (2013, June 04)

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See detailStructure, dynamical properties and topology of GST phase change materials
Raty, Jean-Yves ULg; Bichara, Christophe

Conference (2013, June 04)

Ge-Sb-Te alloys (GST) have been successfully used as Phase Change Materials for data recording applications. They exhibit a unique collection of properties that make them adequate for high performance non ... [more ▼]

Ge-Sb-Te alloys (GST) have been successfully used as Phase Change Materials for data recording applications. They exhibit a unique collection of properties that make them adequate for high performance non-volatile RAM memories. Indeed, their crystalline phase(s) are extremely contrasted, both optically and electrically, against their easily generated amorphous phase(s). Understanding the fast switching mechanisms and the amorphous phase properties remains however quite challenging. In particular, the stability of the amorphous phase against phase separation, recrystallization, and drift of the electronic properties with time and cycling remain problematic. In this work, we generate models of a series of amorphous GST alloys using DFT molecular dynamics and simulated annealing. The obtained structures are compared and generic patterns are described. A new algorithm to determine the topological constraints, based on the analysis of the fluctuations of interatomic bond lengths and bond angles, has been proposed and applied to seven alloy compositions in the GeSbTe phase diagram [1]. A constraint map could then be drawn for the whole ternary system. According to this, the most commonly used GST amorphous phases are shown to be in the stressed rigid region [1]. In order to estimate the effect of rigidity on the recrystallization temperature (Tc), we performed a similar study for Carbon and Nitrogen doped GeTe [2]. The increase of the number of constraints upon doping is shown to be correlated with an increase of the recrystallization temperature and a reduction of the low frequency, or floppy, vibrational modes [3]. The generality of this stabilization mechanism is finally tested on other systems. [1] M. Micoulaut, J.Y. Raty, C. Otjacques, and C. Bichara, Physical Review B 81 (2010) 174206 [2] G. Ghezzi, J.Y. Raty, S. Maitrejean, A. Roule, E. Elkaim and F. Hippert, Applied Physics Letters, 99 (2011) 151906. [3] J.Y. Raty, P. Noe, G.Ghezzi, S. Maitrejean, C. Bichara and F. Hippert. To be published. [less ▲]

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See detailWhat is the role of the Brand Human Voice in driving Consumer Engagement? A social media perspective
Gretry, Anaïs ULg; Brandt, Céline ULg; Van Riel, Allard

Conference (2013, June 03)

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See detailSocial Security and Economic Integration
Artige, Lionel ULg; Dedry, Antoine ULg; Pestieau, Pierre ULg

Conference (2013, June 03)

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See detailApproche de la Complexité en Génie des Procédés
Crine, Michel ULg

Conference (2013, June 02)

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See detailSocial Rights, Civil Rights : Addressing Disability Discrimination in the United States and in Sweden
Lejeune, Aude ULg

Conference (2013, June 02)

Some scholarly works have highlighted the diffusion of the US disability rights model in Europe, considering that a disability rights’ revolution was underway. They have also identified sources of ... [more ▼]

Some scholarly works have highlighted the diffusion of the US disability rights model in Europe, considering that a disability rights’ revolution was underway. They have also identified sources of resistance to the diffusion of this “civil rights’ frame” to address disability issues in Europe (Burke, 2004; Heyer, 2002; Vanhala, 2011; Waldschmidt, 2009). Focusing on legal mobilizations against disability discrimination in the workplace, I analyze and compare how government agencies (the Swedish Ombudsman against discrimination and the US Equal Employment Opportunity Commission), as well as non-governmental organizations in both countries, address these issues. How do the structures of national institutions frame legal mobilizations against disability discrimination in each country? Do they tend to converge in the way they mobilize the law to address these issues? Through investigative techniques consisting primarily of open-ended interviews with lawyers working in NGOs and in government agencies for equality in the United States and in Sweden, I highlight several challenges faced by studies on disability rights, especially when they describe and explain convergence of legal mobilizations, and try to offer suggestions for overcoming these challenges. More broadly, this contribution aims to call into question the processes of transnationalisation and policy transfer from one country to another. [less ▲]

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See detailVocal impact of a prolonged reading task at two intensity levels : Perceptual analysis
Remacle, Angélique ULg; FINCK, Camille ULg; Schoentgen, Jean et al

Conference (2013, June 01)

Our goal is to evaluate the impact on voice of both duration and intensity level of 2 hours of continuous oral reading. Fifty normophonic women underwent two sessions of voice loading in which the ... [more ▼]

Our goal is to evaluate the impact on voice of both duration and intensity level of 2 hours of continuous oral reading. Fifty normophonic women underwent two sessions of voice loading in which the required intensity level of voice varied: 60-65 dB(A) for the first session, and 70-75 dB(A) for the second session. Objective measurements and subjective self-ratings were presented in a previous study (Remacle, Finck, Roche & Morsomme, 2012). Here are the results of perceptual analysis based on comparative judgments. Ten expert listeners evaluated the pressedness and the breathiness of one sentence recorded before and after each loading session. Pairs of stimuli were presented randomly to listeners who were asked to designate the most pressed sample at a first listening and the most breathy sample at a second listening. Each pair of stimuli was presented twice in order to evaluate the reliability. Results indicate that inter-judges and intra-judges reliability was poor to fair. Concerning the duration effect of vocal loading, results showed a significant decrease of breathiness but no change of pressedness after reading in both sessions. The decreased breathiness represents a voice improvement which could be interpreted as an adaptation of voice to loading. When comparing the two intensity levels, no difference was found for breathiness and pressedness after vocal loading. Similarly to objective measurements and self-ratings, perceptual assessments suggest that the duration of vocal loading has more effects on voice than its intensity level. [less ▲]

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See detailLes semences non-industrielle en quête de qualification
Hecquet, Corentin ULg

Conference (2013, June 01)

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See detailEU-Brazil ‘strategic partnership’ from an European Perspective
Santander, Sébastian ULg

Conference (2013, June 01)

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See detailThe academic writing : what the students think of it
Scheepers, Caroline ULg

Conference (2013, June)

The data which will be studied in this contribution arose from a Master's degree course in languages and French literatures. Our course aimed to support students in thesis writing, seeking to acculture ... [more ▼]

The data which will be studied in this contribution arose from a Master's degree course in languages and French literatures. Our course aimed to support students in thesis writing, seeking to acculture the students (Pollet) in the discursive peculiarities of this aspect of research in training (Reuter). During the course, we studied the aspects of this form of writing (« indications of of scientificity ») that need to be acquired by confirmed or young researchers: we consider phenomena such as enonciative care (Reuter, Vanhulle), modalisations (Bronckart), argumentation (Amossy, Plantin), discursive polyphony (Boch, Grossmann, Rinck)… At the end of the course, the students draft their own discursive analysis of a thesis. The analysis is at the same time descriptive (what indicators does the thesis contain that have been studied in the course?) and normative (does the thesis respect the standards seen in the course?). We shall study analyses drafted by the students under this focus : what reveal these works of the representations which the students built up themselves about the academic writing? The method of collecting data is very simple : we’ve studied the works of our students. In 68 works received, we shall identify the standards which the students track down, implicitly or explicitly, concerning the writing of the thesis. We shall confront the conceptions of the students with those emanating from researchers who work about academic literacies (Boch, Crinon, Delcambre, Grossmann, Guigue, Pollet, Rinck). The analysis, always current, shows in particular that the representations of the students and the experts do not coincide in every case: the writing has to remain neutral, the student cannot take a stand, he cannot discuss his sources... Certain student conceptions should be answered and reveal levels of literacy differentiated. Furthermore, these erroneous representations could represent an obstacle when the students will draft their own thesis. The questions are : what is the origin of these representations? How to lead all the students towards a more expert and more scientific knowledge of the academic writing? [less ▲]

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See detailLes acteurs civils dans la conservation de la biodiversité au Sud Sri Lanka : Ethnographie d'une ONG environnementale locale
Rosillon, Caroline ULg

Conference (2013, June)

L’article se centre sur les résultats d’une enquête ethnographique menée au sein d’une ONG locale menant des projet de développement « durable » dans un village du Sud du Sri Lanka. À partir de cet ... [more ▼]

L’article se centre sur les résultats d’une enquête ethnographique menée au sein d’une ONG locale menant des projet de développement « durable » dans un village du Sud du Sri Lanka. À partir de cet exemple, la question posée est la suivante : « Comment les politiques locales et globales de la conservation de la biodiversité structurent-elles l’arène locale du village, s’intègrent aux formes de gouvernance locale et/ou participent à leur reconfiguration ?». [less ▲]

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See detailTrees communities and filters to restoration along a periurban gradient of tropical forest degradation
Hick, Aurélie ULg; Tooth, Martin; Tshibungu, Alain et al

Conference (2013, June)

Detailed reference viewed: 21 (13 ULg)
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See detailDetermination of activation yields for fusion plasma escaping charged particles diagnostics
Chene, Grégoire ULg; Bonheure, George; Delvigne, Thierry et al

Conference (2013, June)

Detailed reference viewed: 28 (5 ULg)
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See detailRéalité clinique d'une prise en charge orthodontique et pédodontique
CHARAVET, Carole ULg; FOUCHER, France ULg

Conference (2013, June)

Orthodontistes et pédodontistes travaillent en étroite collaboration dès le plus jeune âge chez l'enfant. En effet, nous recevons en consultation de nombreux patients nécessitant une prise en charge ... [more ▼]

Orthodontistes et pédodontistes travaillent en étroite collaboration dès le plus jeune âge chez l'enfant. En effet, nous recevons en consultation de nombreux patients nécessitant une prise en charge pluridisciplinaire. La communication entre ces deux disciplines s'illustre donc par un plan de traitement conjoint. Cette prise en charge sera argumentée au travers de différents cas cliniques issus de nos consultations : - Malocclusion dentaires : Dépistage et Interception précoce : * Aspects préventifs : Suppression des troubles fonctionnels, éducation du comportement alimentaire, encourager les fonctions préhension morsure et une mastication efficace. * Aspects interceptifs : Réalisation de meulages occlusaux pour réhabiliter une fonction masticatrice efficace, appareils de gymnastique * Gestion préventive des pertes de place - La dent de 6 ans : * Résorption atypique (Cas de premières molaires définitives bloquées résorbant les deuxièmes molaires lactéales) : Que faire ? Mise en place d'un mini fixe orthodontique * Première molaire définitive fortement cariée : Extraire ou conserver ? Quel est le bon moment pour extraire? Faut il symétriser ces extractions ? Dans le cas d'une édentation distale, comment appréhender ce problème pour éviter une prognatie mandibulaire ? Tout au long de cette communication, nous essayerons de mettre en évidence les stratégies adéquates pour ces traitements pluridisciplinaires auxquels nous sommes confrontés au quotidien. [less ▲]

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See detailSpecies delimitation and diversification in the widespread tree genus Milicia (Moraceae)
Daïnou, Kasso ULg; Mahy, Grégory ULg; Duminil, Jérôme et al

Conference (2013, June)

The long generation time and large effective size of widespread forest tree species can result in slow evolutionary rate and incomplete lineage sorting, complicating species delimitation. We addressed ... [more ▼]

The long generation time and large effective size of widespread forest tree species can result in slow evolutionary rate and incomplete lineage sorting, complicating species delimitation. We addressed this issue with the African timber tree genus Milicia that comprises two morphologically similar and often confounded species: M. excelsa, widespread from West to East Africa, and M. regia, endemic to West Africa. We combined information from nuclear microsatellites (nSSRs), nuclear and plastid DNA sequences, and morphological systematics to identify significant evolutionary units and infer their evolutionary and biogeographical history. We detected five geographically coherent genetic clusters using nSSRs and three levels of genetic differentiation. First, one West African cluster matched perfectly with the morphospecies M. regia, which formed a monophyletic clade at both DNA sequences. Second, a West African M. excelsa cluster formed a monophyletic group at plastid DNA and was more related to M. regia than to Central African M. excelsa, but shared many haplotypes with the latter at nuclear DNA. Third, three Central African clusters appeared little differentiated and shared most of their haplotypes. Although gene tree paraphyly could suggest a single species in Milicia following the Phylogenetic Species Concept, the existence of mutual haplotypic exclusivity and non-admixed genetic clusters in the contact area of the two taxa indicate strong reproductive isolation, and thus, two species following the Biological Species Concept. Molecular dating of the first divergence events showed that speciation in Milicia is ancient (Tertiary), indicating that long-living tree taxa exhibiting genetic speciation may remain similar morphologically. [less ▲]

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See detailHow Intellectual Capital Influences Innovation in Belgian Luxury Houses
Riguelle, France ULg; Van Caillie, Didier ULg

Conference (2013, June)

Since almost three decades, luxury houses have been tackling the increasing importance of groups and of private investment funds specialized in the luxury sector (Roux & Floch, 1996). Therefore innovation ... [more ▼]

Since almost three decades, luxury houses have been tackling the increasing importance of groups and of private investment funds specialized in the luxury sector (Roux & Floch, 1996). Therefore innovation has become an important source of value creation and of competitive advantage for them (Chevallier & Mazzalovo, 2008; Kapferer & Bastien, 2009). Reciprocally, luxury houses usually demonstrate a strong intellectual capital according to the definitions of Bontis (1998). Although the impact of intellectual capital on innovation has been widely demonstrated by scholars in a general scope (Subramaniam & Youndt, 2005), the existence and the nature of this influence has not been investigated in the luxury sector yet. The aim of our research is to highlight if a causal relationship exists in Belgian luxury houses, in order to validate or invalidate the results obtained by Subramaniam & Youndt (2005) and by Wu, Chang, & Chen (2008) within the luxury sector. [less ▲]

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See detailDetermination of activation yield curves for fusion escaping particle diagnostics
Strivay, David ULg; Bonheure, George; Delvigne, Thierry et al

Conference (2013, June)

Detailed reference viewed: 27 (7 ULg)
See detailThe first three billion years of life Evolution
Javaux, Emmanuelle ULg

Conference (2013, June)

Detailed reference viewed: 44 (4 ULg)
Peer Reviewed
See detailComportement biogéochimique des métaux lourds des sédiments de Sebou en ressuspension à l'aval de la ville de Fès
Hassimi, H.; Debbaut, Vincent ULg; Diouri, S. et al

Conference (2013, June)

Detailed reference viewed: 29 (1 ULg)
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See detailModeling of damage to crack transition using a coupled discontinuous Galerkin/cohesive extrinsic law framework
Wu, Ling ULg; Becker, Gauthier; Noels, Ludovic ULg

Conference (2013, June)

One current challenge related to computational fracture mechanics is the modelization of ductile fracture and in particular the damage to crack transition. In this paper we propose to achieve this goal by ... [more ▼]

One current challenge related to computational fracture mechanics is the modelization of ductile fracture and in particular the damage to crack transition. In this paper we propose to achieve this goal by combining 1. A non-local damage model 2. The hybrid discontinuous Galerkin (DG)/extrinsic cohesive law (ECL) formulation As classical damage models for finite element formulations lose the solution uniqueness and face the strain localization problem when strain softening of materials is involved, the damage model is herein formulated in a so-called implicit non-local approach, following the developments in [1]. In this formulation, a new non-local variable, the non-local accumulated plastic strain eg, representative of an internal variable and its derivatives, results from the resolution of a new boundary value problem. Besides the advantage of using C0 elements, although the elements have now one additional degree of freedom per node, this approach also possesses the feature of being fully non-local. The hybrid DG/ECL method was recently proposed [2] to circumvent the drawbacks of the cohesive element methods. Indeed, with this DG/ECL method, prior to fracture, the flux and stabilization terms arising from the DG formulation at interelement boundaries are enforced via interface elements in a way that guarantees consistency and stability, contrarily to traditional extrinsic cohesive zone methods. Upon the onset of fracture, the traction–separation law (TSL) governing the fracture process becomes operative without the need to modify the mesh topology as the the cohesive elements required to integrate the TSL are already present. This DG/ECL method has been shown to be an efficient numerical framework that can easily be implement in parallel with excellent scalability properties to model fragmentation, dynamic crack propagation in brittle and smallscale yielding materials, for 3D problems and for thin structures [3,4]. In this work, the DG/ECL method is extended to account for the damage process, as described in the non-local setting. One main advantage of the DG/ECL formulation is the existence of interface elements in which the damage model can be solved, the hydrostatic pressure can be resolved, and through which discontinuities can easily be introduced with a physically-based criterion. [less ▲]

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See detailEVALUATION OF PERFORMANCES OF HYBRID ELECTRIC ENERGY STORAGE SYSTEM (LI-ION BATTERIES/ SUPERCAPACITORS) EV AND HEV APPLICATIONS
Lemaire, Julien ULg; Nzisabira, Jonathan ULg; Duysinx, Pierre ULg

Conference (2013, June)

Electric and hybrid electric vehicles sound the best alternative to internal combustion engines. However, energy storage systems must have a sufficient power and energy density (to answer accelerations ... [more ▼]

Electric and hybrid electric vehicles sound the best alternative to internal combustion engines. However, energy storage systems must have a sufficient power and energy density (to answer accelerations, regenerate breaking power and have sufficient autonomy). The advantage of batteries is their relatively large energy capacity. But batteries life time and capacity are limited by the number and the magnitude of current peaks [1]. The efficiency also depends on the discharge current regime. More there is high peak current, more the efficiency decreases [2]. Electrical double layer capacitors (EDLC) have a huge specific power and long life cycle because of their internal working principles especially based on charges transfer [3]. The main disadvantage is low specific energy. A combination of the two systems is interesting to gain energy capacity and lengthens the life of the batteries by limiting current peaks inside. The aim of this study is to evaluate the performances of a hybrid energy storage system (Li-ion batteries and EDLC) using a simulation tool. Batteries and EDLC are assembled in parallel in a high power bus. Batteries are directly linked on the bus because their nearly constant voltage. Conversely EDLC have to be connected with a DC/DC converter. Efficiencies of the elements are dependent on the actual current within each component. Given a total energy capacity and a current profile, the difference in final energy capacity may vary from about 15% whether the storage system is composed of batteries and EDLC or not. With hybrid energy storage the batteries are less discharged because of presence of EDLC (particularly due to efficiency difference) and their life cycle is longer. [less ▲]

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See detailTime Controlled Cryogenic Zone Compression (t-CZC) GC-HRMS - A Novel Tool for Target Analyses at Ultra Trace Levels
Krumwiede, D; Mehlman, H; Focant, Jean-François ULg et al

Conference (2013, June)

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See detailCadaveric VOC Profiles for Forensic Investigations
Stefanuto, Pierre-Hugues ULg; Stadler, S; Forbes, S et al

Conference (2013, June)

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See detailRecent Advances in Blood Analyses of POPs
Brasseur, Catherine ULg; L'Homme, Benjamin ULg; Focant, Jean-François ULg

Conference (2013, June)

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See detailLe juge, la loi et la nationalité belge - Quel rôle et quelle marge de manoeuvre pour le juge?
Wautelet, Patrick ULg

Conference (2013, June)

Cette présentation a formé le support d'une intervention lors d'une conférence consacrée à la réforme du Code de la nationalité belge. L'intervention avait pour objectif de mesurer la marge de manoeuvre ... [more ▼]

Cette présentation a formé le support d'une intervention lors d'une conférence consacrée à la réforme du Code de la nationalité belge. L'intervention avait pour objectif de mesurer la marge de manoeuvre et d'appréciation du juge dans l'examen des demandes fondées sur le Code. L'analyse montre que la réforme de décembre 2012 a introduit un système limitant de manière importante la liberté d'appréciation du juge. Ceci apparaît clairement dans les demandes fondées sur l'acquisition de la nationalité par déclaration. [less ▲]

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See detailThe Evolution of Couple and Family Therapy in Europe: complex but not diverse enough
D'Amore, Salvatore ULg

Conference (2013, June)

In Europe, family therapy has achieved an extraordinary level of development through the creation of schools, centers, journals and in particular in the European Family Therapy Association. Aside from the ... [more ▼]

In Europe, family therapy has achieved an extraordinary level of development through the creation of schools, centers, journals and in particular in the European Family Therapy Association. Aside from the traditional topics, it strikes me that European couple and family therapy develops complexity through neurobiology, evidence based family and couple therapy; and through the development of narrativist and constructivist approaches. But, the European take on the complexity approach does have certain limitations partly due to, not thoroughly enough, considering the concept of diversity. [less ▲]

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See detailVenus night side measurements of winds at 115 km altitude from NO bright patches tracking.
Bertaux, J.-L.; Gérard, Jean-Claude ULg; Stiepen, Arnaud ULg et al

Conference (2013, June)

N and O atoms produced by photo-dissociation of CO2 and N2 on the day side of Venus are transported to the night side in the thermospheric circulation. When the air parcel is descending, the recombination ... [more ▼]

N and O atoms produced by photo-dissociation of CO2 and N2 on the day side of Venus are transported to the night side in the thermospheric circulation. When the air parcel is descending, the recombination N+O→ NO produces the famous γ and δ bands of NO emission. Pioneer Venus (1978) suggested that the statistical center of the emission is off from the anti-solar point, about one- two hours in Local time after midnight. This is confirmed from SPICAV/VEX results, and the explanation generally accepted is the influence of retrograde super rotation. However, the emission takes place at 115 km, while VIRTIS/VEX, with maps of O2 emission (peak altitude 95 km) in the night side of Venus (recombination of O+O coming from the day side), has shown that the maximum of emission is statistically centered on the antisolar point. Therefore, there is no influence of super-rotation at 95 km. One way to explain this paradox is that the cause of the super rotation is different at 115 km and in the lower atmosphere. Alternately, some gravity waves could propagate from below, crossing the altitude 95 km with minimal interaction, and breaking around 115, depositing their momentum. Another consideration is that the altitude of N2 photo-dissociation is higher in the thermosphere than CO2, therefore the thermospheric circulation pattern may be different for the transport of N atoms, and O atoms. We have started building maps of the NO emission by moving around the spacecraft along its orbit on the night side. The idea is that NO emission is concentrated generally in rather well defined patches of light. Therefore, by comparing maps taken at 1 hour or 24 hr interval, we can make a “bright patch tracking”, and derive directly the velocity of the moving air parcel containing N and O (we are aware that a part of the motion could be due to a phase shift of a gravity wave, if it has some influence on the NO emission). Preliminary results from this exercise with Venus Express will be presented and discussed. [less ▲]

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See detailA ligament influences the diversification of damselfishes (Pomacentridae)
Frederich, Bruno ULg; Olivier, Damien ULg; Litsios, Glenn et al

Conference (2013, June)

The Pomacentridae (damselfishes) is one of the most successful families of reef-associated fishes (386 species). In 1981, Stiassny described a synapomorphic trait of the Pomacentridae: the cerato ... [more ▼]

The Pomacentridae (damselfishes) is one of the most successful families of reef-associated fishes (386 species). In 1981, Stiassny described a synapomorphic trait of the Pomacentridae: the cerato-mandibular ligament (CML) joining the hyoid bar (ceratohyal) to the internal part of the mandible (coronoid process of the articulo-angular). Here, we highlight that this ligament is lacking in at least 18 damselfish species from different subclades (i.e. Chrominae, Abudefdufinae and Pomacentrinae) and we explore the impact of its disappearance on lineage, morphological and ecological diversification through their evolutionary history. Using a time-calibrated phylogeny including 208 species, we found no support for different rates of lineage diversification between species that lack the CML and the others. Yet, the CML clearly governs a part of the morphological diversity in damselfishes. Indeed, the body and mandible shapes differ significantly between species without CML and the others. Evolutionary modeling of some phenotypic traits (i.e. body and mandible shape) mainly supports models with two rates of morphological diversification across the time-tree with the species without CML having a higher rate of morphological diversification than the others. Mapping the diet of all studied species illustrates that damselfishes lacking CML are highly zooplanktivorous species. Their shapes suggest they feed on planktonic copepods with a higher contribution of ram-feeding (i.e. predator movement towards prey) in comparison with the other planktivorous damselfishes. Finally, the CML could have promoted easy shifts among the three main trophic guilds in damselfishes (i.e. grazers, zooplanktivorous and omnivorous) during evolution but the disappearance of the CML allowed a functional specialization linked to prey-capture strategies. These results support the primary role of the CML in the evolution and diversification of pomacentrids. [less ▲]

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See detailp27(Kip1) as a master regulator of cortical neuron migration.
Godin, Juliette ULg; Thomas, Noémie; Laguesse, Sophie ULg et al

Conference (2013, June)

Detailed reference viewed: 33 (10 ULg)
See detailDynamics of the auroral bifurcations at Saturn and their role in magnetopause reconnection
Gérard, Jean-Claude ULg; Radioti, Aikaterini ULg; Grodent, Denis ULg

Conference (2013, June)

We summarize recent results obtained with the UVIS instrument on board Cassini. They demonstrate that auroral signatures of magnetic field reconnection events in the flanks of the magnetopause are ... [more ▼]

We summarize recent results obtained with the UVIS instrument on board Cassini. They demonstrate that auroral signatures of magnetic field reconnection events in the flanks of the magnetopause are observed in the UV images collected by UVIS. [less ▲]

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See detailLes procédures européennes IPE & RPL
Berthe, Aude ULg

Conference (2013, June)

Detailed reference viewed: 24 (2 ULg)
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See detailDeveloping sustainable competences through the whole professional life
Dujardin, Jean-Marie ULg

Conference (2013, June)

Detailed reference viewed: 35 (12 ULg)
See detailProbing single molecules with the AFM: force, dynamics, and function
Duwez, Anne-Sophie ULg

Conference (2013, June)

Detailed reference viewed: 3 (0 ULg)
See detailThe Upper Paleolithic of the Ikh Tulberin Gol (Northern Mongolia): new excavation at the Tolbor 16 site
Zwyns, N.; Gladyshev, S.A.; Gunshinsuren, B. et al

Conference (2013, June)

Detailed reference viewed: 23 (1 ULg)
Peer Reviewed
See detailReforming the Postal Universal Service
Gautier, Axel ULg; Poudou, Jean-Christophe

Conference (2013, June)

The postal sector has undergone dramatic changes over the recent years under the double effect of ongoing liberalization and increased competition with alternative communication channels (e-substitution ... [more ▼]

The postal sector has undergone dramatic changes over the recent years under the double effect of ongoing liberalization and increased competition with alternative communication channels (e-substitution). As a result, the mail volume handled by the historical operator has declined sharply while the latter's ability to match the same standard of universal service may be under threat. Thus, a reform of the postal universal service is on the agenda. This paper examines possible reforming options ranging from keeping universal service within the postal sector to redefining universal service as spanning postal and electronic technologies. [less ▲]

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See detailAn incremental-secant mean-field homogenization scheme for elasto-plastic and damage-enhanced elasto-plastic composite materials
Wu, Ling ULg; Noels, Ludovic ULg; Adam, Laurent et al

Conference (2013, June)

This paper presents an incremental secant mean-field homogenization process for composite materials made of elasto–plastic constituents, which can exhibit damage. In this formulation, the residual stress ... [more ▼]

This paper presents an incremental secant mean-field homogenization process for composite materials made of elasto–plastic constituents, which can exhibit damage. In this formulation, the residual stress and strain states reached in the phases upon a fictitious elastic unloading, are considered as starting point to apply the secant method. The mean stress fields in the phases are then computed using isotropic secant tensors, which are naturally used to define the Linear Comparison–Composite. The method, remains simple in its formulation, is applied on various problems involving elastic, elasto–plastic and perfectly–plastic phases, to demonstrate its accuracy compared to other existing MFH methods. The method is particularly attractive when the damaging process is accounted for in the matrix phase. Indeed, during the damaging process of one phase, the secant method can account for the resulting unloading of the other phase, ensuring an accurate prediction of the scheme, when compared to direct numerical simulations. [less ▲]

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See detailClassification of foreign entities for corporate income tax purposes
Peeters, Bart ULg

Conference (2013, June)

Detailed reference viewed: 18 (0 ULg)
See detailLa gestion des compétences tout au long de la vie
Dujardin, Jean-Marie ULg

Conference (2013, June)

Detailed reference viewed: 58 (13 ULg)
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See detailApplying a second gradient theory on reinforced concrete structural elements
Soufflet, Marc; Jouan, Gwendal ULg; Kotronis, Panagiotis et al

Conference (2013, June)

Detailed reference viewed: 25 (2 ULg)
See detailTreatment for patients with disorder of consciousness
Thibaut, Aurore ULg

Conference (2013, June)

Detailed reference viewed: 17 (1 ULg)
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See detailA micro-model of the intra-laminar fracture in fiber-reinforced composites based on a discontinuous Galerkin/extrinsic cohesive law method
Wu, Ling ULg; Tjahjanto, Denny; Makradi, Ahmed et al

Conference (2013, June)

The hybrid discontinuous Galerkin (DG)/extrinsic cohesive law (ECL) method was recently proposed [1] to circumvent the drawbacks of the cohesive element methods. With the DG/ECL method, prior to fracture ... [more ▼]

The hybrid discontinuous Galerkin (DG)/extrinsic cohesive law (ECL) method was recently proposed [1] to circumvent the drawbacks of the cohesive element methods. With the DG/ECL method, prior to fracture, the flux and stabilization terms arising from the DG formulation at interelement boundaries are enforced via interface elements in a way that guarantees consistency and stability, contrarily to traditional extrinsic cohesive zone methods. At the onset of fracture, the traction–separation law (TSL) governing the fracture process becomes operative without the need to modify the mesh topology since the cohesive elements required to integrate the TSL are already present. This DG/ECL method has been shown to be an efficient numerical framework that can easily be implement in parallel with excellent scalability properties to model fragmentation, dynamic crack propagation in brittle and small-scale yielding materials, both for 3D problems and for thin structures [1, 2]. In this work, following the developments in [3], the DG/ECL method is extended to the study of composite materials failures at the micro-scale. The method is applied to study the transverse traction of composite materials in characteristic micro-volumes of different sizes. The method captures the debonding process, assimilated to a damaging process before the strain softening onset. It is shown that the density of dissipated energy resulting from the damage (debonding) remains the same for the different studied cell sizes. During the strain softening phase, a micro-crack initiates and propagates, in agreement with experimental observations. After strain softening onset, the extracted macroscale cohesive law, obtained by the method proposed in [4], is ultimately shown to converge for the different cell sizes. The predicted behaviors are then compared to experimental results obtained from laminate tests, and are found to be in good agreement. [less ▲]

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See detailNon-local multiscale analyzes of composite laminates based on a damage-enhanced mean–field homogenization formulation
Wu, Ling ULg; Noels, Ludovic ULg; Adam, Laurent et al

Conference (2013, June)

Properties of carbon fiber reinforced epoxy laminates are studied using an anisotropic gradient–enhanced continuum damage model embedded in a mean–field homogenization (MFH) procedure. The fibers are ... [more ▼]

Properties of carbon fiber reinforced epoxy laminates are studied using an anisotropic gradient–enhanced continuum damage model embedded in a mean–field homogenization (MFH) procedure. The fibers are assumed to remain elastic, and the matrix material obeys an elasto–plastic behavior enhanced by the proposed damage model. The resulting multi– scale model is then applied to study the damage process at the meso–scale of laminates, and in particular the damaging of plies in a composite stack. By using the gradient–enhanced continuum damage model, the problem of losing uniqueness and strain localization, which happens in classical finite element simulations when strain softening of materials is involved, is avoided. As a demonstration a stack with a hole is studied and it is shown that the model predicts the damaging process in bands oriented with the fiber directions, accordingly to the conducted experimental results. [less ▲]

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See detailFactor complexity of S-adic sequences
Leroy, Julien ULg

Conference (2013, June)

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See detailTowards a comprehensive framework for the assessment of groundwater drought in temperate regions
Tsakiris, Georges; Nalbantis, Ioannis; Vangelis, Harris et al

Conference (2013, June)

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See detailDéveloppement de méthodes de quantification en milieu complexe par chromatographie liquide microfluidique couplée à la spectrometrie de masse
Houbart, Virginie ULg; Rozet, Eric ULg; Crommen, Jacques ULg et al

Conference (2013, June)

L’hepcidine est un biomarqueur peptidique dont l’intérêt tant comme outil de diagnostic que de suivi de pathologies est de plus en plus solidement établi. Il existe donc une demande forte d’outils ... [more ▼]

L’hepcidine est un biomarqueur peptidique dont l’intérêt tant comme outil de diagnostic que de suivi de pathologies est de plus en plus solidement établi. Il existe donc une demande forte d’outils sensibles et robustes afin de la doser au sein de milieux biologiques tels que le plasma ou le sérum. Une méthode analytique a été développée à l’aide d’un système chromatographique miniaturisé (nanoLC-chip) couplé à un spectromètre de masse permettant d’assurer un dosage de l’hepcidine à la fois sensible et fiable. Lors du développement de cette méthode, il a été constaté que la composition de l’échantillon avait une influence majeure sur la réponse analytique. Or, l’utilisation de systèmes chromatographiques miniaturisés implique souvent l’injection de volumes proportionnellement très importants par rapport aux dimensions du système, ce qui amplifie encore l’impact de sa composition. C’est pourquoi il est capital d’avoir une bonne compréhension des phénomènes qui ont lieu entre l’injection de l’échantillon dans le système chromatographique et la détection par spectrométrie de masse, et particulièrement lors du développement de méthodes analytiques quantitatives. Dans cette étude, nous avons utilisé la planification expérimentale afin de mieux comprendre le comportement chromatographique des peptides, ainsi que les facteurs qui influencent la sensibilité de la méthode développée. Un mélange de peptides a été sélectionné, varié tant du point de vue du poids moléculaire que du point isoélectrique et de l’hydropathie. Un plan de criblage a permis de délimiter le domaine expérimental ainsi que les facteurs significatifs parmi la composition de la phase mobile (proportion et nature de l’agent de paire d’ions) et de l’échantillon en lui-même (nature de l’agent de paire d’ions et proportion de solvant organique). Ensuite, un plan d’expériences factoriel complet a été mis en œuvre afin d’observer plus finement le rôle de chaque facteur ainsi que les interactions éventuelles qui les lient. Certains facteurs ont montré un effet très marqué tant sur l’intensité de la réponse que sur la rétention. Entre autres, la composition de l’échantillon, facteur parfois négligé lors du développement de méthodes, a démontré son importance capitale, en particulier sur les phénomènes de rétention des peptides. Les données obtenues ont également permis de dégager des conditions optimales d’analyse en termes de rétention et de sensibilité. Enfin, une analyse en composantes principales a également été réalisée sur le grand nombre de données récoltées dans le but de mettre en évidence d’éventuels propriétés physicochimiques des peptides qui pourraient avoir un impact significatif sur les réponses étudiées. [less ▲]

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See detailIT Centralization and Enterprise-Wide IT Capabilities and Outcomes: A Public Sector Study
Markus, M. Lynne; Jacobson, Dax D.; Bui, Quang Neo et al

Conference (2013, June)

IT capabilities, including IT governance, are widely believed to affect the value organizations derive from IT. This paper focuses on what may be an important strategy for building enterprise-wide IT ... [more ▼]

IT capabilities, including IT governance, are widely believed to affect the value organizations derive from IT. This paper focuses on what may be an important strategy for building enterprise-wide IT capabilities in large decentralized organizations: undertaking an IT centralizing reorganization to concentrate authority for IT activities and decisions at the headquarters level of an enterprise. IT centralizing reorganizations are theorized to change an organization’s IT governance in ways that promote capability development and enable enterprise-wide IT initiatives such as IT consolidation and outsourcing. These ideas are explored through a multi-method study of US state governments. [less ▲]

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See detailThe amylolysin from Bacillus amyloliquefaciens GA1
Fickers, Patrick ULg

Conference (2013, June)

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