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See detailAfrique: le péril des migrations climatiques
Ozer, Pierre ULg; Gemenne, François ULg

Article for general public (2014)

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See detailNouakchott: les pieds dans l'eau
Ozer, Pierre ULg

Article for general public (2014)

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See detailEstimated Subglottic Pressure Evaluation According to Vocal Pathology. Study on 418 Patients
Morsomme, Dominique ULg; Chareix, Hélène; FINCK, Camille ULg et al

Conference (2014, May 31)

Estimated subglottic pressure (ESGP) is part of the aerodynamic measurements included in the vocal profile. It is an indication of vocal effort and can guide the therapist in his clinical approach. We aim ... [more ▼]

Estimated subglottic pressure (ESGP) is part of the aerodynamic measurements included in the vocal profile. It is an indication of vocal effort and can guide the therapist in his clinical approach. We aim to examine the clinical interest of the ESGP by observing its values according to voice pathology, age, gender and sound pressure level. We also examine the relationships between PSGE, DSI and VHI. Method:The study includes 418 patients (M:118/W:300). Each patient’s file consists of VLS, acoustic, aerodynamic and perceptual measures. The ESGP was collected through the Phonatory Aerodynamic System Model 6600 (KayPentax). Patients produced 3 sequences of / ipipi / at low (IL), conversational (IC) and high (IH) intensity. Patients were grouped according to the ENT’s diagnosis. Results: Patients without vocal lesions (MTD) had a significantly lower ESGP compared to patients with nodules, polyps, inflammation, edema (IL, IC), cysts (IC) or scar (IC). Patients with vocal fold atrophy had a lower ESGP than those suffering from nodules and polyps at conversational and high intensity, but were not differentiated at low intensity. Amongst patients without lesions (MTD), a positive correlation appeared between ESGP and intensity; which was not the case for patients with lesions. At high intensity, men had a significantly higher ESGP than women. At low intensity, we noted a positive correlation between the VHI scores and ESGP levels. At low and conversational intensity, we observed a negative correlation between DSI and ESGP scores. Conclusion: This study highlights the importance of considering ESGP in the vocal profile. As expected, patients with vocal pathology produce high ESGP. However, the correlations between intensity and ESGP vary depending on the patient's pathology. In addition, ESPG values allow the clinician to distinguish MTD and healthy patients and thus could help the therapist in his clinical approach. [less ▲]

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See detailFalsos positivos de C5-carnitina elevada en cribado neonatal: A que son debidos?
Yahyaoui, Raquel; Rueda; Dayaldasani, Anita et al

in Medicina Clinica (2014)

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See detailWind Tunnel Testing of a VTOL MAV Propeller in Tilted Operating Mode
Theys, Bart; Dimitriadis, Grigorios ULg; Andrianne, Thomas ULg et al

in Proceedings of the 2014 International Conference on Unmanned Aircraft Systems (ICUAS 2014) (2014, May 30)

This paper presents experimental results of the full 3-axis force vector and 3-axis moment vector acting on a propeller, commonly used for a Vertical Take Off and Landing Micro Aerial Vehicle (VTOL MAV ... [more ▼]

This paper presents experimental results of the full 3-axis force vector and 3-axis moment vector acting on a propeller, commonly used for a Vertical Take Off and Landing Micro Aerial Vehicle (VTOL MAV). Measurements were carried out in a wind tunnel using a high resolution 6-axis force/moment sensor embedded in a customized test rig at several wind speeds, propeller rotational speeds and angles of the propeller shaft with respect to the air stream. Results show strong moments acting on the propeller in forward flight and unstable conditions in descending flight. Power calculations reveal a decrease in power consumption during slow forward flight and how motor efficiency can be maximized. [less ▲]

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See detailBoard attributes and conditional conservatism: Evidence from French firms
Boussaid, Nabila ULg; Sougné, Danielle ULg; Hamza, Taher

Conference (2014, May 30)

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See detailEffect of concentration in Ge-Te liquids: A combined density functional and neutron scattering study
Micoulaut, Matthieu; Coulet, M.V.; Piarristeguy, A. et al

in Physical Review. B : Solid State (2014), 89(17), 174205

The structural properties of three compositions of Ge-Te liquids (Ge10Te90, Ge15Te85, Ge20Te80) are studied from a combination of density functional based molecular dynamics simulations and neutron ... [more ▼]

The structural properties of three compositions of Ge-Te liquids (Ge10Te90, Ge15Te85, Ge20Te80) are studied from a combination of density functional based molecular dynamics simulations and neutron scattering experiments. We investigate structural properties including structure factors, pair distribution functions, angular distributions, coordination numbers, neighbor distributions and compare our results with experimental findings. Most noticeable is the good agreement found in the reproduction of the structure in real and reciprocal space, resulting from the incorporation of dispersion forces in the simulation. This leads to Ge and Te coordination numbers which are lower than in previous studies and which can now be followed with temperature, while also strongly depending on the chosen cutoff distance. Results show a gradual conversion of higher coordinated species (TeIV, GeV) into lower coordinated ones at lower temperature, while leaving anticipated coordinations from the octet rule (TeII and GeIV) nearly unchanged. Structural correlations are characterized as a function of temperature and composition. The vibrational density of states is also measured from inelastic neutron scattering for different compositions and temperatures, and compared to the simulated counterpart which exhibits a reasonable agreement at low frequency. [less ▲]

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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 ▲]

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See detailThe European Union election process : a way foward democracy
Michel, Quentin ULg

Scientific conference (2014, May 30)

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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 ▲]

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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)

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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 ▲]

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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 ▲]

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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.

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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 ▲]

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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 ▲]

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