Last 7 days
Bookmark and Share    
Full Text
See detailNumerical Investigation of Continuous Fiber Glass Drawing Process
Chouffart, Quentin ULg; Simon, Philippe; Terrapon, Vincent ULg

Conference (2014, May 30)

The manufacturing process of glass fibers used for the reinforcement of composite material consists in drawing a glass melt at high temperature through the bushing plate into fibers using a winder. This ... [more ▼]

The manufacturing process of glass fibers used for the reinforcement of composite material consists in drawing a glass melt at high temperature through the bushing plate into fibers using a winder. This process is sensitive to numerous disturbances that can cause the fiber to break during the drawing process. In order to understand the origin of these failures and improve the process efficiency, it is important to understand the physics of the forming fiber. We investigate here the underlying physics of the forming of a single fiber through numerical simulations. In particular, we focus on the region from the hole tips at the bushing plate to the glass transition point. The influence of key parameters (e.g. operating windows, and heat transfers mechanisms) on the fiber radius attenuation and the internal stresses is investigated through a sensitivity analysis. In addition, the impact of the temperature variations at the bushing plate is investigated. Finally, we show how the forming stress is influenced by these parameters. It is found that the internal stress can be minimizing by varying the operating windows. On the other hand, results also demonstrate that the heat pattern of the bushing plate is one of the most important causes for disturbance in the process. [less ▲]

Detailed reference viewed: 25 (4 ULg)
Full Text
See detailThe European Union election process : a way foward democracy
Michel, Quentin ULg

Scientific conference (2014, May 30)

Detailed reference viewed: 13 (1 ULg)
Full Text
Peer Reviewed
See detailUsing shear strain localisation to model the fracturing around gallery in unsaturated Callovo-Oxfordian claystone
Pardoen, Benoît ULg; Levasseur, Séverine ULg; Collin, Frédéric ULg

in 10th International Workshop on Bifurcation and Degradation in Geomaterials (2014, May 30)

Galleries drilling leads to damage propagation, fracturing and properties modifications in the surrounding medium. The prediction of the damaged zone behaviour is an important matter and needs to be ... [more ▼]

Galleries drilling leads to damage propagation, fracturing and properties modifications in the surrounding medium. The prediction of the damaged zone behaviour is an important matter and needs to be properly assessed. To do so the fractures can be modelled using shear strain localisation. The coupled local second gradient model is used under unsaturated conditions to correctly model the strain localisation behaviour. The permeability evolution and the rock desaturation due to air ventilation in galleries are considered. Finally, a hydro-mechanical modelling of a gallery excavation in Callovo-Oxfordian claystone is performed leading to a fairly good representation of the damaged zone. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Full Text
Peer Reviewed
See detailToward a Characterization of Western Operatic Singing Voices
Larrouy, Pauline ULg; Magis, David ULg; Nowak, Marion et al

Poster (2014, May 29)

Objective: One can easily recognize the musical style of a singer by listening to his/her sung performance. Several acoustical parameters of the Western operatic singing technique have been studied ... [more ▼]

Objective: One can easily recognize the musical style of a singer by listening to his/her sung performance. Several acoustical parameters of the Western operatic singing technique have been studied. However, the number of parameters could be extended and the effect of melody on these parameters remains unclear. By observing the effects of melody and technique on acoustical and musical parameters of the singing voice, this study aims at further characterizing the Western operatic singing technique. Methods: Fifty professional singers performed two contrasting melodies (popular song and romantic melody) with two vocal techniques (with and without operatic singing technique). The common quality parameters (energy distribution, vibrato rate and extent), perturbation parameters (standard deviation of the fundamental frequency, signal-to-noise ratio, jitter and shimmer) and musical features (fundamental frequency of the starting note, average tempo, and sound pressure level) of the 200 sung performances were analyzed. Results: The results show that the choice of melody had a limited impact on the acoustical and musical parameters observed, whereas a particular vocal profile appeared depending on the vocal technique employed. By examining these parameters in a theoretical model, this study highlights the relevance of vibrato rate, sound level, energy distribution, fundamental frequency of the starting note and tempo in describing the Western operatic singing technique. Conclusions: This study confirms that vocal technique affects most of the parameters examined and that the effect of melody is limited. In addition, the observation of quality and musical parameters contributes to a better understanding of the operatic singing technique. Conversely, the perturbation parameters don’t seem to take part in the characterization of operatic singing voices. Although the suggested theoretical model needs to be further developed in future research, it already generates implications for research and teaching. [less ▲]

Detailed reference viewed: 13 (0 ULg)
See detailAbundance and variability of jellyfishes in the Bay of Calvi, Corsica
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Goffart, Anne ULg

Scientific conference (2014, May 29)

Detailed reference viewed: 34 (2 ULg)
See detailNormalizzare il corpo attraverso il cibo. (Micro)pratiche alimentari e inclusione della diversità.
Mescoli, Elsa ULg

Scientific conference (2014, May 29)

Partendo dal presupposto che la costruzione della soggettività individuale sia un processo composito e dinamico, questo intervento mira a metterne in evidenza i sostrati materiali, cioè quei fattori che ... [more ▼]

Partendo dal presupposto che la costruzione della soggettività individuale sia un processo composito e dinamico, questo intervento mira a metterne in evidenza i sostrati materiali, cioè quei fattori che agiscono direttamente sulla corporeità. In particolare, viene considerata la materialità delle pratiche alimentari e culinarie come luogo della definizione stratificata del sé. Tali pratiche dialogano con una pluralità di discorsi che sfumano i confini dei corpi individuali e li rendono permeabili agli effetti delle rappresentazioni collettive e delle appartenenze che queste determinano. L’intervento focalizzerà sulla storia di Bâhirah, una giovane donna di origine marocchina residente nella provincia di Milano. La sue pratiche del quotidiano, indagate con il metodo dell’osservazione partecipante e grazie ad interviste semi-strutturate, forniscono un esempio delle dinamiche enunciate sopra. L’importanza del cibo nella storia di questa donna è determinata da diversi fattori, tra i quali la malattia di una delle sue figlie, affetta da diabete mellito 1. Le disfunzioni corporee che caratterizzano questa patologia, determinano la necessità, da un lato, di un controllo minuzioso degli alimenti ingeriti (dunque incorporati) e degli elementi biologici che li compongono; dall’altro, una excorporazione di alcune funzioni fisiologiche legate all’alimentazione, delegate a strumenti esterni al corpo. Tali azioni sono finalizzate a conformare quest’ultimo ad una “normalità” definita da canoni biomedici, i quali permettono l’inclusione nella collettività “sana”. Il contesto più ampio in cui queste dinamiche si inseriscono, è costituito da una pluralità di discorsi, tra i quali in particolare quelli che riguardano il rapporto tra alimentazione e migrazione. Se da un lato si assiste ad un’ipermobilità delle gastronomie (o dei loro elementi), alla loro delocalizzazione e rilocalizzazione in culture alimentari altre, dall’altro la standardizzazione delle abitudini alimentari proprie alla diversità culturale sembra essere prerogativa essenziale della cosiddetta “integrazione” dei migranti. Tali dinamiche si ripercuotono sulla materialità delle (micro)pratiche quotidiane attorno al corpo che questo intervento si propone di analizzare. Le riflessioni saranno accompagnate da alcuni supporti visivi. [less ▲]

Detailed reference viewed: 23 (1 ULg)
See detailLien social et protection sociale. Allocution d'ouverture
Vrancken, Didier ULg

Speech (2014)

Cette allocution, tout en resituant la manifestation scientifique dans le cadre des activités de l'AISLF 2012-2016, insiste sur le regard performatif du sociologue et resitue celui-ci dans une perspective ... [more ▼]

Cette allocution, tout en resituant la manifestation scientifique dans le cadre des activités de l'AISLF 2012-2016, insiste sur le regard performatif du sociologue et resitue celui-ci dans une perspective de performation du lien social, au sein d'une société du travail et d'intervention sur les personnes. Cette perspective est enfin éclairée à la lumière des enjeux de reconfiguration des politiques de protection sociale. [less ▲]

Detailed reference viewed: 14 (1 ULg)
See detailDesign of a sprayer that makes CE-ESI-MS easy and robust
Far, Johann ULg; De Pauw, Edwin ULg; Falmagne, Jean-Bernard et al

Conference (2014, May 28)

Presentation of a CEMS interface design for easy and robust coupling of Capillary Electrophoresis with Mass Spectrometry equipped with a nanospray source. Principles and specification were presented.

Detailed reference viewed: 18 (0 ULg)
Full Text
See detailReprésentations de l’environnement et adoption des pratiques durables de production par les cotonculteurs du Bénin
Assogba, Sonagnon Claude-Gervais ULg

Doctoral thesis (2014)

The research aims at contributing to a better understanding of the adoption of eco-friendly innovations. It analyses representations of environment and practices associated with sustainable management of ... [more ▼]

The research aims at contributing to a better understanding of the adoption of eco-friendly innovations. It analyses representations of environment and practices associated with sustainable management of cotton farming systems in order to deepen understanding of logics and strategies underlining farmers’ practices, and motivations that determine their sustainable farming system adoption behaviors. Organic cotton (SCBIO) and cotton made in Africa (SCMIA) systems were used as case study. Field research was carried out in Kandi and Pehunco in the largest area of cotton production in the North of Benin. The theoretical framework is based on the theories of technical change analysis, the actor-oriented approach and the theories of social representations. Data were collected from a sample of 90 organic cotton farmers and 100 CmiA farmers selected from a typology based on endogenous criteria of prosperity. 39 field agents from organizations promoting sustainable cotton farming system were surveyed. Individuals and groups interviews were used to collect data. The data were analyzed with a combination of qualitative and quantitative methods including normative and relative comparison analysis, perception analysis, descriptive statistics, analysis of variance, chi square test, etc. Results show a marginal contribution of organic cotton and cotton made in Africa to national economy in comparison to the conventional system. At farmer’s level farming system analysis reveals that both organic cotton and cotton made in Africa systems are not intensively sustainable. Their implementation is characterized by a large gap between recommendations and farmers’ practices, especially in soils’ fertility and pests’ management. The use of organic matters in combination with crops rotation including leguminous plants is the main approach of soils fertility management in organic cotton system. However, quantities of organic matters used, especially cow dung, are not sufficient due to its low availability and the lack of transportation means. The management of pests and diseases faces enormous constraints ranging from biopesticides production difficulties, weak efficiency of biopesticides, to observation of the evolution of parasitic complex, etc. Although the use of organo-chemical fertilizer is recommended in SCMIA system, more than 50% of SCMIA farmers apply only chemical fertilizer. Globally, the quantities of chemical fertilizer applied are under the requirements while the quantities of organic fertilizers are too small. Application of staged and targeted pest control (lutte étagée ciblée) is limited by constraints coming from the late implementation and the ineffectiveness of pesticides, the high number of observations needed, etc. Therefore, pesticides are used in overdose and prohibited pesticides such as endosulfan are also used. Consequently yields are very low and decrease. In addition, some farmers, especially from organic system, considering necessity of chemical fertilizers use for maize production develop diverse strategic logics such as misappropriation, craftiness, etc. to obtain these fertilizers. It appears from analysis that strategic logics carried out by farmers in farming systems’ adoption are the result of a combination of explanatory factors. These factors contribute to deepen the understanding of the weaknesses of organic and CmiA values chains in Benin and the bottlenecks in their development. Far from being static, farmers’ logics area temporary equilibrium resulting from different explanatory categories relative to social representations of environment, perceptions of projects and production and social reproduction objectives of farmers, the demand of sustainable cotton on international market, etc. Consequently, all actions aimed at promoting the sustainability of cotton farming system may facilitate access of farmers to inputs through the improvement of their existence means for a better soil fertility and pests management. Sensitization and training programs on the importance of leguminous plants integration to crops rotation, staged and targeted pest control, etc., may be carried out. At policy level it would be desirable that policies decisions don't negatively affect the development of alternative cotton value chains. In addition, measures may be taken to facilitate farmers’ access to chemical fertilizers for food crops, especially maize, to avoid their selling off. [less ▲]

Detailed reference viewed: 59 (35 ULg)
Full Text
Peer Reviewed
See detailGenome-Wide Association Interaction Analysis for Alzheimer’s Disease
Gusareva, Elena ULg; Carrasquillo, Minerva M.; Bellenguez, Céline et al

in Neurobiology of Aging (2014)

We propose a minimal protocol for exhaustive genome-wide association interaction analysis that involves screening for epistasis over large-scale genomic data combining strengths of different methods and ... [more ▼]

We propose a minimal protocol for exhaustive genome-wide association interaction analysis that involves screening for epistasis over large-scale genomic data combining strengths of different methods and statistical tools. The different steps of this protocol are illustrated on a real-life data application for Alzheimer's disease (AD) (2259 patients and 6017 controls from France). Particularly, in the exhaustive genome-wide epistasis screening we identified AD-associated interacting SNPs-pair from chromosome 6q11.1 (rs6455128, the KHDRBS2 gene) and 13q12.11 (rs7989332, the CRYL1 gene) (p = 0.006, corrected for multiple testing). A replication analysis in the independent AD cohort from Germany (555 patients and 824 controls) confirmed the discovered epistasis signal (p = 0.036). This signal was also supported by a meta-analysis approach in 5 independent AD cohorts that was applied in the context of epistasis for the first time. Transcriptome analysis revealed negative correlation between expression levels of KHDRBS2 and CRYL1 in both the temporal cortex (β = -0.19, p = 0.0006) and cerebellum (β = -0.23, p < 0.0001) brain regions. This is the first time a replicable epistasis associated with AD was identified using a hypothesis free screening approach. [less ▲]

Detailed reference viewed: 20 (3 ULg)
See detailThe Authority of Human Rights Case Law from the Perspective of the International Criminal Judge
Deprez, Christophe ULg

Scientific conference (2014, May 28)

This brief presentation addressed the question of the legal value of European human rights jurisprudence from the perspective of the international criminal judge.

Detailed reference viewed: 13 (1 ULg)
See detailSynthesis of hybrid nanoparticles for theranostics
Liu, Ji ULg; Detrembleur, Christophe ULg; Duguet, Etienne et al

Conference (2014, May 28)

Detailed reference viewed: 6 (1 ULg)
Full Text
See detailDesign of a spherical array of microphones for room acoustics applications.
Feron, Hermine; Embrechts, Jean-Jacques ULg

Conference (2014, May 28)

Detailed reference viewed: 14 (2 ULg)
Peer Reviewed
See detailRegulation in Practice: Choice among regulatory Tools
Bougnouch, Mehdi ULg; Gautier, Axel ULg

Conference (2014, May 28)

Detailed reference viewed: 14 (4 ULg)
Peer Reviewed
See detailPréférences résidentielles et production du logement en banlieue périurbaine
Halleux, Jean-Marie ULg; Strée, Julie

Conference (2014, May 27)

La communication traitera des relations entre les mécanismes de la production immobilière et les préférences résidentielles. Elle visera à vérifier l’hypothèse selon laquelle nous assistons à l’émergence ... [more ▼]

La communication traitera des relations entre les mécanismes de la production immobilière et les préférences résidentielles. Elle visera à vérifier l’hypothèse selon laquelle nous assistons à l’émergence et au renforcement de préférences susceptibles de remettre en cause le modèle périurbain du pavillon périphérique. Notre propos s’inscrit donc dans la réflexion sur le futur des zones périurbaines (Grant et al., 2013). Notre recherche a consisté dans la réalisation et l’analyse d’une enquête menée au sein de la zone métropolitaine de Bruxelles, auprès de ménages habitant un logement neuf (Strée et Halleux, 2013). Les ménages ont été interrogés sur leurs préférences résidentielles ainsi que sur leurs propensions à payer pour différents types de produits immobiliers. Son échantillon est constitué de 120 ménages ayant été interrogés en face à face à leur domicile. L’échantillon a été stratifié en fonction de deux critères : la localisation au sein de la zone métropolitaine et le type de logements. Concernant la localisation, des enquêtes ont été menées à Wavre (commune située à une demi-heure voiture du centre de Bruxelles) et en plus lointaine périphérie, à Perwez et Chastre (communes situées à une heure voiture du centre de Bruxelles). Concernant les types de logement, la stratification s’est opérée de la manière suivante : 40 % des ménages résident dans une habitation quatre façades, 30 % dans une habitation mitoyenne et 30 % dans un appartement. Un premier résultat de notre enquête est de confirmer la prégnance du modèle de la maison unifamiliale isolée (quatre façades), qui représente le logement idéal pour 69 % de l’échantillon (y compris par 70 % des ménages résidant dans une habitation mitoyenne et par 57 % des ménages résidant en appartement). Pour autant, en comparaison d’enquêtes précédentes, les propensions à payer témoignent d’une bonne acceptation des produits immobiliers alternatifs. Sur base d’enquêtes précédentes réalisées dans le périurbain de Liège, nous nous attendions à une moins-value de 15 à 20 % entre le produit de la maison isolée et le produit de la maison jointive. Or, la différence observée est ici inférieure à 10 %. Cette situation est à relier à la problématique de la disponibilité en zones constructibles (Halleux et Strée, 2012). En effet, le bassin d’emploi bruxellois se caractérisant par une faible disponibilité foncière, cela conduit à banaliser la promotion commerciale de logements jointifs. Au sein de ces territoires, les ménages auraient donc bien intégré ce type de développements. Au sein d’autres territoires aux marchés fonciers moins tendus, nous aurions probablement observé des consentements à payer plus élevés pour la maison isolée, consentements qui auraient alors pu être interprétés comme un signe de stigmatisation vis-à-vis du logement jointif. Au final, nous mettons en avant un effet systémique où, par son impact sur la multiplication des projets de maisons mitoyennes, la rareté de l’offre foncière conduit à renforcer l’acceptation de la demande pour ce type de produits immobiliers. Parmi les autres résultats de notre enquête, soulignons la forte valorisation de la maison de 100 m2 qui, en comparaison d’appartements de la même superficie, est valorisée à un niveau moyen 13 % supérieur. Il existe donc un potentiel commercial important pour la petite maison. Cela représente à la fois une menace pour la consommation d’espace et une opportunité pour la densification douce. Il ressort également de nos enquêtes qu’une localisation intra-urbaine (dans un quartier « ancien ») est fortement dévalorisée. Pour autant, un signal encourageant tient ici à la relation entre l’âge du répondant et cette dévalorisation : les effectifs de moins de 40 ans dévalorisent moins les quartiers densément bâti que les populations plus âgées. Il s’agit là d’un résultat qui s’inscrit dans l’hypothèse de Grant et al. (2013) quant au renforcement de la demande pour des localisations plus urbaines et plus centrales. [less ▲]

Detailed reference viewed: 19 (6 ULg)
Peer Reviewed
See detailCorrelation and integration of the Rorschach Comprehensive System and the TCI-R questionnaire
Rentmeister, Daniel; Blavier, Adelaïde ULg; Di Piazza, Laetitia ULg et al

Poster (2014, May 27)

In this study, a dual purpose is sought. First, we statistically compare the Rorschach test interpreted by the Comprehensive System from J.E. Exner and the Temperament and Character Inventory – Revised by ... [more ▼]

In this study, a dual purpose is sought. First, we statistically compare the Rorschach test interpreted by the Comprehensive System from J.E. Exner and the Temperament and Character Inventory – Revised by R. Cloninger to highlight their differences and similarities. Second, through clinical cases, we discuss the relevance of integrating the results obtained by these two tools to establish a comprehensive and consistent psychological profile of an individual. For the statistical comparison, a sample of 27 “healthy” subjects (M = 24.37 years, SD = 2.75) was first submitted to the Rorschach test. Then, immediately after, each subject completed the TCI-R. A correlation analysis (Pearson Rho) was done between various Index and a Bonferroni adjustment was made. For the case studies, 3 subjects were recruited. Anamneses were carried out and the Rorschach test and TCI-R administered. Our first results, which are to be taken with caution because of the small number of subjects in the sample, must be qualified and discussed. From 2448 statistical comparisons, we select the most relevant and discuss different correlation results. The case studies show a concordance in social relationships and impulsivity; and show that the information peculiar to each test allows us to complete the subject’s profile. Finally, it is by addressing two different epistemologies underlying these two tests that we can best explain the psychological differences highlighted in the same individuals. We conclude by suggesting that this difference in results must certainly be understood in an integrative logic and emphasizes the complementarity between these two tests. [less ▲]

Detailed reference viewed: 36 (4 ULg)
Peer Reviewed
See detailLong protocols to Rorschach Comprehensive System and a posteriori reduction of number of responses: What is the impact on the clinical interpretation ?
Dufour, Cristelle; Englebert, Jérôme ULg; Blavier, Adelaïde ULg

Poster (2014, May 27)

Our study was interested in the exceptionally long protocols, superior to 55 answers, supplied by five subjects in the test of Rorschach according to the method of the Comprehensive System. In order to ... [more ▼]

Our study was interested in the exceptionally long protocols, superior to 55 answers, supplied by five subjects in the test of Rorschach according to the method of the Comprehensive System. In order to gain understanding of which attitude to adopt in front of this kind of protocol, we made a a posteriori reduction of the number of answers by basing us on the recommendations of Exner (Exner, on 2001), then a comparative study between the clinical interpretation realized with all of the answers and with only the first five answers by board. We also replicate this methodology of a posteriori decrease of the number of answers with four answers by board according to the new recommendations of the system R-PAS of Meyer and al. (Meyer and al, on 2009). The sample consists of three raw coal subjects and two psychiatric subjects. Our analysis highlighted a stability of certain variables (EB, Lambda, EA for example) but a difference in the psychological profile of the subjects after reduction. We observed a clarification of the fundamental difficulties to the psychiatric subjects and rather a neutralization of these difficulties for the raw coal subjects, with particularly defence mechanisms which seem more adapted. In our sample, the consideration of all of the answers or only of the partial protocol thus brings a difference in the clinical interpretation ; as a consequence any reduction should be made with big caution. Our study allows to discuss current practices of the test of Rorschach, by looking for a compromise between the inherent constraints to the validity of the test and the questions of the clinical complexity decrease appropriate to any initiative of standardization. [less ▲]

Detailed reference viewed: 19 (1 ULg)