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See detailAssessing steady-state, multivariate experimental data using Gaussian Processes: the GPExp open-source library
Quoilin, Sylvain ULg; Schrouff, Jessica ULg

in Energies (2016), 9(6),

Experimental data are subject to different sources of disturbance and errors, whose importance should be assessed. The level of noise, the presence of outliers or a measure of the “explainability” of the ... [more ▼]

Experimental data are subject to different sources of disturbance and errors, whose importance should be assessed. The level of noise, the presence of outliers or a measure of the “explainability” of the key variables with respect to the externally-imposed operating condition are important indicators, but are not straightforward to obtain, especially if the data are sparse and multivariate. This paper proposes a methodology and a suite of tools implementing Gaussian processes for quality assessment of steady-state experimental data. The aim of the proposed tool is to: (1) provide a smooth (de-noised) multivariate operating map of the measured variable with respect to the inputs; (2) determine which inputs are relevant to predict a selected output; (3) provide a sensitivity analysis of the measured variables with respect to the inputs; (4) provide a measure of the accuracy (confidence intervals) for the prediction of the data; (5) detect the observations that are likely to be outliers. We show that Gaussian processes regression provides insightful numerical indicators for these purposes and that the obtained performance is higher or comparable to alternative modeling techniques. Finally, the datasets and tools developed in this work are provided within the GPExp open-source package. [less ▲]

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See detailGC×GC-TOFMS for forensic blood VOC profiling
Dubois, Lena ULg; Perrault, Katelynn ULg; Stefanuto, Pierre-Hugues ULg et al

Poster (2016, May 30)

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See detailNormer le passé : politique, droit et histoire
Grandjean, Geoffrey ULg

Conference given outside the academic context (2016)

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See detailPathologies of the puerperium in the cow. How to define, diagnose, understand and treat.
Hanzen, Christian ULg

Learning material (2016)

The aim of this conference is to answer to the 8 following questions In which economical context are we working ? Is puerperium important for the reproductive performance of the cow ? How to define the ... [more ▼]

The aim of this conference is to answer to the 8 following questions In which economical context are we working ? Is puerperium important for the reproductive performance of the cow ? How to define the pathologies of the puerperium ? What’s the prevalence of these pathologies ? How to diagnose the pathologies of the puerperium ? When to detect these pathologies ? What kind of relations exist between these pathologies ? How to treat these pathologies ? [less ▲]

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See detailIntégration, inclusion, appropriation
Defays, Jean-Marc ULg

Scientific conference (2016, May 27)

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See detail• BibliothEP: a study evaluating the effectiveness of bibliotherapy for premature ejaculation
Kempeneers, Philippe ULg; Andrianne, Robert ULg; Bauwens, Sabrina et al

Conference (2016, May 27)

Objective. The BibliothEP study aimed to assess the efficacy of a bibliotherapy for premature ejaculation (PE) Design and method. The study was conducted in two phases. First, a sample of 120 participants ... [more ▼]

Objective. The BibliothEP study aimed to assess the efficacy of a bibliotherapy for premature ejaculation (PE) Design and method. The study was conducted in two phases. First, a sample of 120 participants suffering from PE read a concise cognitive behavioural self-help manual for PE (51 A5 pages including illustrations) and were compared after treatment to 66 waiting list controls. Second, 36 subjects received and read the self-help manual and were compared after treatment to 32 subjects having received the same manual plus a complementary brief guidance (45-90 minutes) from a coach not specialised in sex therapy, but who had been specifically trained to support the bibliotherapy intervention (by attending a 5-hour training module). The main outcome measures were self-determined latency time to ejaculation, feelings of control, sexual satisfaction, PE-related distress and subjective impression of improvement. Results. At 6-month posttreatment, all participants showed significant improvements as compared to waiting list condition. The improvements were maintained at 12 month. They were slightly greater in the case of complementary therapist support. Improvements were demonstrated for all forms of PE, but the intervention appeared to be slightly more effective when the problem was of moderate severity. In all cases, improvements in sexual functioning were accompanied by improvements in sexual cognitions. Conclusions. The cost-effectiveness of the self-help manual makes it a valuable first-line treatment for any form of PE. Moreover, the outcome of the bibliotherapy process might be increased by coaching from a health worker specifically trained to this aim. [less ▲]

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See detailEntre Rome, Bruxelles et l’Espagne : le confesseur du gouverneur-général, quelles loyautés ?
Pirlet, Pierre-François ULg

Conference (2016, May 26)

Les Pays-Bas catholiques de la première moitié du XVIIe siècle constituent un ensemble politique placés sous la direction d'un gouverneur-général de sang royal ou issu de la haute noblesse hispanique. La ... [more ▼]

Les Pays-Bas catholiques de la première moitié du XVIIe siècle constituent un ensemble politique placés sous la direction d'un gouverneur-général de sang royal ou issu de la haute noblesse hispanique. La cour de ce Prince est organisée sur le modèle madrilène : il est ainsi assisté par un confesseur particulier, choisi par le gouvernement royal pour ses qualités et pour son appartenance à l'un ou l'autre ordre religieux. Les religieux successifs qui occupent la charge font l'objet d'une attention soutenue de la part de différents acteurs politiques : le gouverneur-général lui-même, les courtisans bruxellois, le gouvernement royal, les ordres religieux et la papauté observent avec attention l'action de ces confesseurs. La vision qu'a Rome de ces clercs est celle d'alliés objectifs. Il est entendu que ceux-ci doivent naturellement assister le nonce en toute occasion et contribuer à asseoir la politique romaine en terres habsbourgeoises. Pourtant, à Bruxelles, les principaux intéressés ne suivent pas assidûment cette ligne directrice. Ma communication proposera d'étudier, sur la base de sources issues des Archives générales du Royaume de Belgique et de l'Archivo General de Simancas, l'attitude d'une série de confesseurs princiers actifs dans la grande première moitié du XVIIe siècle face aux attentes de la papauté et de ses représentants dans le but de comprendre dans quelle mesure ce clerc contribua à – ou se tint éloigné de – la politique telle que voulue depuis Rome. Je tâcherai également de recenser et de comprendre les loyautés – à Madrid, à Bruxelles et à Rome – conditionnant l'action de ce religieux. [less ▲]

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See detailBrain breaks in the classroom. An example of implementation in Belgium
Cloes, Marc ULg; Cloes, Stéphanie

Conference (2016, May 26)

School is identified as the main pillar of the fight against sedentariness in youth. Several models of active schools have been described in the literature and, under the umbrella of the school policy ... [more ▼]

School is identified as the main pillar of the fight against sedentariness in youth. Several models of active schools have been described in the literature and, under the umbrella of the school policy enhancing physical activity (PA), five main dimensions can be identified (Physical education, Active transportation, Life environment, Sport at school, PA in the classroom). This underlines that, if the PE teacher is considered as the corner stone of the PA promotion at school, (s)he is not alone to create the conditions aiming to permit to the children to reach the PA level recommended daily. Integrating more PA in the classroom seems to be a promising approach for children lifestyle as well as for their overall learning. Worldwide, initiatives are proposed in order to convince classroom teachers to integrate more often PA in their educational activities. Nowadays, it seems determining to share experiences in order to identify good practices and solutions to the current problems that teachers can encountered on the field. The goal of this presentation is to illustrate two concrete examples of projects implemented in primary schools in Wallonia, Belgium. We will describe the teaching context as well as the main findings provided by a systematic data analysis conducted during these experiments. The first study focused on three classes proposing Brain Breaks (BB) videos during a 10 weeks period. The attitude of the pupils and the teaching staff opinions were analyzed. In the second study, varied PA breaks (BB video, games, and video developed by the pupils) were proposed during periods of two to four weeks. Data from participant observation and questionnaires were used. In both studies, findings support the planning of PA during classroom. Even if more controlled research designs would be necessary in order to determine the evidence of the results, we can state that practitioners and children involved in the projects showed really positive reactions about these opportunities to be more active. [less ▲]

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See detailNumerical Modeling and Experimental Identification of Mistuned Multi-Stage Bladed Assemblies
Nyssen, Florence ULg

Doctoral thesis (2016)

In turbomachinery, low pressure compressors are composed of a succession of bladed disks. To reduce the mass and increase the performance of the aircraft engines, one-piece multi-stage units of bladed ... [more ▼]

In turbomachinery, low pressure compressors are composed of a succession of bladed disks. To reduce the mass and increase the performance of the aircraft engines, one-piece multi-stage units of bladed disks have been recently developed. But these one-piece technologies are challenging for the mechanical design due to exacerbated effects of mistuning (i.e., mode localization and forced response amplification). In the thesis, an experimental method for the identification of mistuning in multi-stage bladed structures is proposed and validated. Numerical modeling methods are proposed to reduce computational times for the statistical predictions of the forced response amplification. A characterization of the interstage coupling is performed and a criterion is proposed to predict in advance if a multi-stage analysis is necessary. [less ▲]

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See detailIn situ and laboratory mechanical characterization of a loess sequence from Middle Belgium
Delvoie, Simon ULg; Charlier, Robert ULg; Collin, Frédéric ULg

Conference (2016, May 25)

A 10 m thick loess (aeolian silt) layer located beside the Romont quarry (Eben-Emael, Middle Belgium) has been investigated in order to characterize the mechanical behaviour of the silty material. Cone ... [more ▼]

A 10 m thick loess (aeolian silt) layer located beside the Romont quarry (Eben-Emael, Middle Belgium) has been investigated in order to characterize the mechanical behaviour of the silty material. Cone penetration tests (CPT) have been performed with different cones (M1-type, M2-type and electric) in order to evaluate the influence of the cone on the mechanical behaviour interpretation. Concurrently, laboratory tests have been performed on undisturbed samples from core drillings. Laboratory tests consist of a physical characterization (grain size distribution, Atterberg limits) and a mechanical characterization (oedometer tests). This comprehensive investigation study focuses on the comparison of the loess characterization between in situ and laboratory approaches. CPT-based soil behaviour type charts are analyzed and compared with the Unified Soil Classification System. Many relations also exist in the literature between parameters obtained from CPT results and from laboratory tests. The study explores the existing relations between the cone resistance and the oedometer constrained modulus in order to verify the related coefficients proposed in the literature for silty material. [less ▲]

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See detailLes problématiques de la rénovation du stock bâti dans la ville de demain : résultats d’une étude initiale en Belgique.
Ruellan, Guirec ULg; Attia, Shady ULg

Scientific conference (2016, May 25)

Pour atteindre les objectifs énergétiques de l’Union Européenne pour 2050, et plus largement les objectifs fixés à la dernière COP, le secteur de la construction et de l’habitat doit opérer sa mue vers un ... [more ▼]

Pour atteindre les objectifs énergétiques de l’Union Européenne pour 2050, et plus largement les objectifs fixés à la dernière COP, le secteur de la construction et de l’habitat doit opérer sa mue vers un modèle plus durable. En Belgique, cela passe par la rénovation et l’amélioration des performances du stock bâti existant. La présente étude porte sur l’identification des différents enjeux (environnementaux, économiques et sociaux) liées à la rénovation en Belgique et tente d’objectiver les barrières (de financement, de communication et de réglementation) à une augmentation du taux de rénovation, à travers une revue de littérature des différentes études et projets portant sur ce domaine en Belgique. Ces résultats initiaux devront permettre ultérieurement la conduite des recherches approfondies visant à la modélisation des effets de plusieurs stratégies possibles d’augmentation du taux de rénovation. [less ▲]

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