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See detailProbabilistic Measures of Earthquake Effects on Fire Performance of Tall Buildings
Elhami Khorasani, Negar; Gernay, Thomas ULg; Garlock, Maria

in Zingoni (Ed.) Proceedings of the Sixth International Conference on Structural Engineering, Mechanics and Computation (2016, September 06)

Cascading multi-hazard events, such as fires following an earthquake, can trigger progressive collapse of structures. Risk or the probability of reaching a limit state after an extreme event is related to ... [more ▼]

Cascading multi-hazard events, such as fires following an earthquake, can trigger progressive collapse of structures. Risk or the probability of reaching a limit state after an extreme event is related to (a) the probability of occurrence of the hazard, and (b) the probability of reaching the limit state given the hazard. In this paper, earthquake effects on fire performance of tall buildings in a community are studied. First, the proba-bility of fire ignition due to an earthquake is modeled based on historical data and properties of the built en-vironment. In the second step, the effect of earthquake on structural fire performance of a steel frame is studied using system level probabilistic approaches. The results show that the earthquake does not increase the probability of reaching different limit states under fire, however, post earthquake fire can increase the drift demand on columns located on the perimeter of the structure, and may cause instability. [less ▲]

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See detailIntroducing regenerative design and circularity into architectural and engineering curriculum
Attia, Shady ULg

in Mazijn (Ed.) BUILDING A CIRCULAR ECONOMY TOGETHER (2016, September 05)

Looking today to the challenges for planning and design of sustainable built environment including, carbon emissions, climate change, human health, water problems, biodiversity, scarcity of resources ... [more ▼]

Looking today to the challenges for planning and design of sustainable built environment including, carbon emissions, climate change, human health, water problems, biodiversity, scarcity of resources, depletion of fossil fuel, population growth and urbanization; sustainable architecture will play a key role for the sustainable development of society as a whole. In the context of an architectural design studio, this paper presents the experience of introducing the concept of regenerative design within a Belgian engineering faculty. The regenerative design objective and principles are used as a method to develop engineers’ capabilities to design within a circular economy paradigm. The aim of the study is to evaluate the adoption of circular economy principles and their influence on the decision making and final outcomes on third-year architectural engineering students at the University of Liege (Ulg), Faculty of Applied Sciences in 2014 and 2015. The paper utilizes two design studios outcomes in the form of projects evaluation and students feedback, in the form of interviews and surveys, in order to assess the students’ knowledge uptake, learned skills and design capabilities. Students completed a knowledge, skills, and attitudes questionnaire before the curriculum, after the final learning experience, and one year later. The paper provides results that shed light on the opportunities, challenges and architectural engineer’s needs to engage in a circular built environment. [less ▲]

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See detailTraining engineers to meet the challenges of a changing world: how a competency framework improves teaching programs and team cohesion
Degré, Aurore ULg; Colaux, Catherine ULg

in Mazijn, Bernard (Ed.) 8th Conference on Education engineering for sustainable development (2016, September 05)

The competency framework is a complex and time-consuming exercise seen by most teachers as an administrative process. When applied, however, it can be a powerful tool for adapting curricula for engineers ... [more ▼]

The competency framework is a complex and time-consuming exercise seen by most teachers as an administrative process. When applied, however, it can be a powerful tool for adapting curricula for engineers to meet the emerging needs of society, including training in sustainable development. This paper looks at how to use the competency framework to generate a tool for bringing teachers together around shared objectives, helping students build their career paths and improving communication with the ‘outside world’. This approach, largely inspired by the Tardif approach, is being used for the Bioengineering Masters Degree in Environmental Sciences and Technology at the Gembloux Agro-Bio Tech Faculty, University of Liège, Belgium. The approach has allowed the teaching staff to build a common educational project aimed at enabling bioengineers to meet the needs of society [less ▲]

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See detailFlipped classes and enriched skeleton maps to foster deep and interactive learning in engineering education
Attia, Shady ULg; Detroz, Pascal ULg

in Mazijn (Ed.) BUILDING A CIRCULAR ECONOMY TOGETHER (2016, September 05)

This paper reports the initial experience of applying the enriched skeleton mapping technique as innovative and meaningful learning methods within a flipped class teaching setting. Driven by the low ... [more ▼]

This paper reports the initial experience of applying the enriched skeleton mapping technique as innovative and meaningful learning methods within a flipped class teaching setting. Driven by the low confidence and autonomy of many undergraduates; this study focus on stimulating collaboration and interactive learning. The study was performed in a course labeled ‘sustainable building construction technology’ of the Bachelor of Architectural Engineering program at Liege University (Ulg). First year and second year students, were assigned to an experimental group of 27 students and a control group of 8. In the experimental group, students worked together in pairs on mini-concepts and created enriched skeleton maps for the course content. The control group received a regular ex-cathedra course. The results show that students who used the enriched skeleton mapping technique were more engaged and outperformed the control group. Enriched skeleton concept mapping fostered deep learning and resulted in a better understanding of the course mini concepts in addition to the course structure and domain. Students of the enriched skeleton mapping found learning to be more ‘useful, stimulating and more engaging’, whereas students of the congenital ex-cathedra curriculum found learning to be ‘passive and boring’. A combination of both techniques may provide the most effective training for undergraduate engineering students. [less ▲]

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See detailGrazing practices, perception and expectations of Walloon dairy farmers
Lessire, Françoise ULg; Bernard, Maxime; Lioy, Rocco et al

in Högling, Mats; Bakken, Anne Kjersti; Hovstad, Knut Anders (Eds.) et al The multiple roles of grassland in the European bioecnomy (2016, September 04)

The role of grasslands as a C sink is generally accepted. It is considered that permanent grasslands allow annual C storage rates between 22 and 44 g C/m2/y (Soussana et al., 2010) thereby contributing to ... [more ▼]

The role of grasslands as a C sink is generally accepted. It is considered that permanent grasslands allow annual C storage rates between 22 and 44 g C/m2/y (Soussana et al., 2010) thereby contributing to the mitigation of greenhouse gas (GHG) emissions. Grassland preservation has several other advantages including a decrease in feeding costs (Dillon et al., 2005), a positive effect on cows’ health (e.g.a decrease in lameness) (Burow et al., 2011) and the provision of a positive image to consumers. Despite these arguments, grazing is decreasing in Europe and grasslands are disappearing. A better understanding of grazing practices and of farmers’ expectations could suggest ways of improving these practices and limiting grassland disappearance. As a result, Walloon dairy farmers were surveyed in December 2015 and the preliminary results are presented below. [less ▲]

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See detailFrom resource to process efficiency. Educating a new generation of georesources engineers
Pirard, Eric ULg; Fiorentino, Rosalia ULg

in Mazijn, Bernard (Ed.) Proceedings 8th Conference on Engineering Education for Sustainable Development (2016, September)

Even though the Circular Economy paradigm clearly puts the emphasis on recycling, it is essential to understand that we will still need for decades to explore and find resources in the earth crust. Mining ... [more ▼]

Even though the Circular Economy paradigm clearly puts the emphasis on recycling, it is essential to understand that we will still need for decades to explore and find resources in the earth crust. Mining is vital to feed the loop and make sure enough metals and minerals are made available to society. But, mining is also one of the most challenging industrial operations when it comes to sustainability objectives. A modern education in mineral resources engineering must build on a strong technical background but give students the opportunity to confront their knowledge with societal needs and responsibilities. The EMerald Erasmus Mundus Master program in Georesources Engineering was set up by four leading European universities with the clear objective to educate responsible professionals who will be actors of sustainable solutions. Therefore, the University of Lorraine, the Lulea Technical University, the TU Bergakademie Freiberg and the University of Liege (coordinator) designed a unique curriculum bridging the traditional gap between natural sciences and engineering, encompassing the valley too often separating the industrial operators from the stakeholders of a mining project. The program offers a unique blend of courses from geology to mineral processing with the aim to familiarize students with the most advanced tools for improving the efficiency of processes. Field trips and industrial visits are a key component of this program as are the non-technical seminars delivered by professionals (lawyers, entrepreneurs, NGO leaders, etc.). Evaluation is often based on written reports, documentary research and short oral presentations to make sure students acquire the indispensable soft skills for efficient communication on environmental and societal issues linked to the impact of extractive activities. Internships and hands-on practices on pilot platforms or laboratory equipments are absolutely essential to reach the highest standards and meet the objectives of the master program. This is costly and can only be maintained thanks to the strong presence of the participating universities in research programs. All four universities are core partners of the EIT Raw Materials knowledge innovation community. This gives an additional leveraging effect when it comes to the education of young entrepreneurs with a strong sustainability mindset. [less ▲]

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See detailMonitoring topography of laboratory fluvial dike models subjected to breaching based on a laser profilometry technique
Rifai, Ismail ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in International Symposium on River Sedimentation: Stuttgart 19th-22d september 2016 (2016, September)

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See detailTraduction inter-culturelle et validation du Kujala Anterior Knee Pain Scale (AKPS) en français
Kaux, Jean-François ULg; Bornheim, Stephen ULg; Remy, Gaël et al

in 9ème Congrès commun SFMES - SFTS (2016, September)

Introduction : Le syndrome fémoro-patellaire est l'un des problèmes de genou les plus répandus qui se caractérise par une douleur antérieure du genou dans des activités mettant en charge l'articulation ... [more ▼]

Introduction : Le syndrome fémoro-patellaire est l'un des problèmes de genou les plus répandus qui se caractérise par une douleur antérieure du genou dans des activités mettant en charge l'articulation fémoro-patellaire. Le Kuala Anterior Knee Pain Scale (Kujala AKPS) est un questionnaire utilisé pour évaluer les symptômes subjectifs, tels que les limitations fonctionnelles et la douleur antérieure du genou. Le questionnaire a déjà été traduit et validé en portugais brésilien, en persan, en chinois, en turque, et en néerlandais. Le but de cette étude est de traduire ce questionnaire en français afin d'en évaluer sa fiabilité et sa validité. Matériel et méthode : La traduction et l’adaptation interculturelle du questionnaire a été adaptée selon les recommandations internationales qui se présentent en 6 étapes : traduction initiale, synthèse des traductions, traduction de retour vers la langue d’origine, comité d'experts, test de la version pré-finale et approbation du comité experts. Une fois la version française obtenue, les participants (n=101) ont remplis 2 fois le Kujula AKPS avec un intervalle de 7 jours, et le Short Form Health Survey (SF-36) afin d'en évaluer les propriétés psychométriques (la cohérence interne, la fidélité test-retest et la validité de construit). Résultats : Le Kujula AKPS montre une fidélité test-retest élevée pour le score total (ICC 0,97). La traduction française possède une cohérence interne élevée (0,87). Le Kujula AKPS possède une corrélation forte avec une partie des sous-échelles convergentes du SF-36 (PF, RP et BP). Il y a une corrélation faible ou modérée avec les sous-échelles divergentes du SF-36 (MH, SF et VT). Il n’y a pas d’effet plancher et plafond. Conclusion : La version française du questionnaire Kujula AKPS étant compréhensible, semble avoir une bonne adaptation interculturelle. Cette étude a démontré que le Kujula AKPS-F est fiable et valide pour les patients francophones souffrant d'un syndrome rotulien. [less ▲]

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See detail10 years of advances in nonlinear system identification in structural dynamics: A review
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of ISMA 2016 - International Conference on Noise and Vibration Engineering (2016, September)

Nonlinear system identification is a vast research field, today attracting a great deal of attention in the structural dynamics community. Ten years ago, an MSSP paper reviewing the progress achieved ... [more ▼]

Nonlinear system identification is a vast research field, today attracting a great deal of attention in the structural dynamics community. Ten years ago, an MSSP paper reviewing the progress achieved until then concluded that the identification of simple continuous structures with localised nonlinearities was within reach. The past decade witnessed a shift in emphasis, accommodating the growing industrial need for a first generation of tools capable of addressing complex nonlinearities in larger-scale structures. The objective of the present paper is to survey the key developments which arose in the field since 2006 towards developing these tools. [less ▲]

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See detailTeaching of Life Cycle Assessment methodology to sensitize future engineers to sustainable development
Belboom, Sandra ULg; Léonard, Angélique ULg

in Proceedings of the 8th Conference on ‘Engineering Education for Sustainable Development’ (2016, September)

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See detailCpG-DNA expand immunosuppressive interstitial macrophages from Ly6c+ local precursors
Sabatel, Catherine ULg; Radermecker, Coraline ULg; Fievez, Laurence ULg et al

in Proceeding of Cell Symposia: 100 years of phagocytes (2016, September)

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See detailProcess oriented characterisation of oolitic iron concentrate during dephosphorisation by roasting and leaching
Ionkov, Krassimir; Gomes, Otavio; Neumann, Reiner et al

in Proceedings of the XXVIII International Mineral Processing Congress (IMPC 2016) (2016, September)

Phosphorus in iron ores is considered as a deleterious component to iron making reflecting in cold shortness of the produced steel. The present study investigates the phosphorus migration pattern ... [more ▼]

Phosphorus in iron ores is considered as a deleterious component to iron making reflecting in cold shortness of the produced steel. The present study investigates the phosphorus migration pattern resulting from thermal treatment of an oolitic-type iron concentrate with and without additives. To this end focused mineralogical and microscopic observations were performed. The results have shown that roasting with alkaline additive drives phosphorus outside the hematite hosting mineral, however it remains evenly distributed inside the volume of the oolites. It penetrates inside the newly formed cementing phases of Al-Na-Si-Fe-type and also fills the interstices between the crystals. Other than phosphorus, aluminum, calcium and iron tend also to migrate towards the amorphous-type cementing phase. Finally, the possibilities for P removal by means of magnetic separation and acid leaching of the roasted concentrate were evaluated. The obtained final product presents a standard iron concentrate suitable for steelmaking with its phosphorous being dropped from 0.71% to 0.05% and iron grade of a nearly 66% being reached. [less ▲]

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See detailAdaptation interculturelles du questionnaire "Patient-Rated Tennis Elbow Evaluation" pour les patients francophones
Kaux, Jean-François ULg; DELVAUX, François ULg; SCHAUS, Jean ULg et al

in 9ème Congrès commun SFMES - SFTS (2016, September)

Contexte: L’épicondylite latérale est une blessure commune chez les joueurs de tennis et les travailleurs physiques pour qui il existe un questionnaire en anglais qui en évalue la sévérité. Le ... [more ▼]

Contexte: L’épicondylite latérale est une blessure commune chez les joueurs de tennis et les travailleurs physiques pour qui il existe un questionnaire en anglais qui en évalue la sévérité. Le questionnaire « Patient-Rated Tennis Elbow Evaluation » (PRTEE) mesure la douleur et l’incapacité fonctionnelle du coude chez les patients souffrant d’une épicondylite latérale. Le questionnaire a déjà été traduit en suédois, en turc, en québécois, en italien, en néerlandais et en grec. Objectifs : Le but de cette étude est de traduire et de réaliser une adaptation interculturelle du questionnaire PRTEE en français et d’en évaluer sa fiabilité et sa validité. Matériel et Méthodes : Le PRTEE a été adapté interculturellement en français selon les lignes directrices internationales. Les participants (n=115) ont rempli le PRTEE-F, deux fois avec un intervalle de 30 minutes, le questionnaire Disabilities of Arm, Soulier and Hand (DASH), et le Short Form Health Survey (SF-36) pour évaluer la fiabilité et la validité du PRTEE-F. La cohérence interne (avec l’alpha de Cronbach), la fidélité test-retest (avec la corrélation intra-classe (ICC)) et la validité de construit (avec le coefficient de corrélation de Spearman). Résultats : Le PRTEE-F montre une fidélité test-retest bonne pour le score total (ICC 0,83) et pour les différents items (ICC 0,71-0,9). La traduction française possède une cohérence interne élevée (0,98). La corrélation entre le PRTEE-F et le DASH est forte pour le score total (rs=0,92, p<0.001), pour le sous-total symptomatique (rs=0,86, p<0.001) et fonctionnel (rs=0,93, p<0.001). Le PRTEE-F possède une corrélation forte avec une partie des sous-échelles convergentes du SF-36 (PF, RP et BP). Il y a une corrélation faible ou modérée avec les sous-échelles divergentes du SF-36 (REm, MH, SF et VT). Il n’y a pas d’effet plancher et plafond. Conclusion : La version française du questionnaire PRTEE a été adaptée interculturellement avec succès, et cette étude a montré que le PRTEE-F est fiable et valide pour évaluer les patients francophones souffrant d’une épicondylite latérale. [less ▲]

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See detailEngineering education at the heart of the Raw Materials Value Chain
Pirard, Eric ULg; Sonnemann, Guido

in Mazijn, Bernard (Ed.) Proceedings 8th Conference on Engineering Education for Sustainable Development (2016, September)

EIT Raw Materials has the mission to reinforce Europe’s innovation capacity by preparing the entrepreneurs and innovators of tomorrow. By fully integrating the three sides of the knowledge triangle ... [more ▼]

EIT Raw Materials has the mission to reinforce Europe’s innovation capacity by preparing the entrepreneurs and innovators of tomorrow. By fully integrating the three sides of the knowledge triangle (education, research and industry), the EIT Raw Materials aims at boosting the innovation process: from idea to product; from lab to market and from student to entrepreneur. A key mission of the EIT Raw Materials is to educate young professionals and specifically engineers and scientists by breaking the barriers of classical disciplines. The so-called T-shaped professional will have a strong entrepreneurial mindset and combine an in depth knowledge of his own discipline with a sound understanding of the challenges appearing along the whole raw materials value chain, such as exploration, extraction and processing of primary resources, recycling of secondary resources and substitution of critical and toxic materials. It is essential that these T-shaped professionals understand their role within the value chain as actors of a more circular economy. Every educational activity organized under the umbrella of the EIT Raw Materials (RM) Academy will therefore make sure to involve all stakeholders of the raw materials value chain and to contribute to raising awareness with respect to the societal function of raw materials and the related supply and availability challenges. To achieve these missions and create a long lasting impact, the RM Academy aims to innovate in terms of teaching, which includes: • The promotion of problem-based learning, self organisation and learning by doing. • The offer of an open learning environment and a series of online courses. • Enabling a high degree of mobility of students and professionals. • Facilitating access to experimental platforms and pilot plants for hands-on training • Adopting a strong multidisciplinary approach (e.g. joint courses across sectors) • Thinking beyond boundaries and systematically exploring and generating new ideas • Transforming innovations into feasible business solutions • Joint curriculum development Critical reflection, peer review processes as well as assessments and collegial discussions under the roof of the EIT Raw Material Academy will be used for continuing quality development of the programs. [less ▲]

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See detailStudy of Meta-Analysis Strategies for Network Inference using Information-Theoretic Approaches
Pham, Cam Ngoc ULg; Haibe-Kains; Bellot, Pau et al

in IEEE Dexa workshops 2016 (2016, September)

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See detailImpact d’une réathlétisation précoce sur les performances des sportifs opérés d’une rupture du ligament croisé antéro-externe du genou
Duval, Thomas; Kaux, Jean-François ULg; LEHANCE, Cédric ULg et al

in 9ème Congrès commun SFMES - SFTS (2016, September)

Introduction : La reconstruction du ligament croisé antéro-externe du genou est une chirurgie lourde qui est suivie d’une longue période de rééducation. Le retour au sport après cette opération reste ... [more ▼]

Introduction : La reconstruction du ligament croisé antéro-externe du genou est une chirurgie lourde qui est suivie d’une longue période de rééducation. Le retour au sport après cette opération reste toutefois un défi. Plus d’un tiers des athlètes est incapable de reprendre son activité au même niveau. La peur de subir un nouvel accident reste un obstacle majeur à cette reprise sportive et la persistance de déficits fonctionnels est la première cause de récidives de déchirure ligamentaire. Matériels et méthodes : Notre échantillon comprend dix sujets, cinq dans le groupe bénéficiant d’une réathlétisation précoce et cinq dans le groupe témoin. Le premier groupe réalise une séance de réathlétisation précoce hebdomadaire (à raison d’une fois par semaine et ce, durant six mois) associée à la rééducation en kinésithérapie durant une durée de six mois. Le deuxième groupe bénéficie uniquement de séances de kinésithérapie classique respectant un protocole bien défini du CHU de Liège. Nous avons choisi de réaliser, en pré-opératoire, dans les deux groupes, un test isocinétique. En post-opératoire (après six mois), les sujets des deux groupes ont réalisé dans l’ordre suivant : un test isocinétique, un questionnaire de KOOS et enfin des tests fonctionnels (Hop test). Les séances de réathlétisation et de kinésithérapie sont suivies selon un protocole spécifique respectant l’individualisation propre à chaque patient. Résultats : L’analyse des tests isocinétiques et du questionnaire de KOOS, nous a permis de constater des différences entre les deux groupes au niveau des valeurs chiffrées mais qui ne sont cependant pas significatives (P level= 0,07). Par contre, l’analyse des résultats obtenus dans les tests fonctionnels (tests de sauts en longueur évaluant la performance en distance) a montré des différences significatives (P level= 0,04 pour le single hop et le triple hop test, P level= 0,02 pour le cross over hop test) entre les deux groupes et celles-ci sont au bénéfice du groupe ayant bénéficié d’une réathlétisation précoce. Conclusion : Dans cette étude, nous constatons une amélioration globale des performances en faveur du groupe ayant bénéficié d’une réathlétisation précoce. Cependant lors de l’analyse statistique et ce surtout concernant dans le test isocinétique, peu d’éléments évoluent de manière significative voir aucun pour le questionnaire de KOOS. Le faible échantillonnage de cette étude préliminaire intervient certainement dans ce constat. [less ▲]

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See detailA Macro-Element Formulation and Solution Procedure for Shear Analysis of RC Deep Beams
Liu, Jian ULg; Mihaylov, Boyan ULg

in the 11th fib International PhD Symposium in Civil Engineering (2016, August 30)

This paper presents a computationally-effective macro element capable of predicting the complete shear response of RC deep beams in analogy with beam elements for slender beams. The element stems from a ... [more ▼]

This paper presents a computationally-effective macro element capable of predicting the complete shear response of RC deep beams in analogy with beam elements for slender beams. The element stems from a three-parameter kinematic theory (3PKT) for the shear strength and deformation capacity of deep beams subjected to double curvature. The macro element is composed of two rotational springs and one transverse spring to simulate the nonlinear flexural and shear behaviour of the shear span. The element has two nodes (end sections) with two DOFs per node, which enables it to be easily connected to other elements of the same or different types to model structures with deep beams. The numerical implementation of the element is based on the secant stiffness approach which provides robust convergence properties. Validation studies are performed by using thirteen tests from the literature showing excellent results for the complete shear response. The obtained peak load experimental-to-predicted ratios have an average of 1.10 with a coefficient of variation of 14.2%, while these values for the mid-span deflection are 1.16 and 17.0%. [less ▲]

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See detailA Comparison between four Techniques to Measure Cardiac Output
Pironet, Antoine ULg; Dauby, Pierre ULg; Chase, J. Geoffrey et al

in Proceedings of the 38th International Conference of the IEEE Engineering in Medicine and Biology Society (2016, August 17)

Cardiac output is an important variable when monitoring hemodynamic status. In particular, changes in cardiac output represent the goal of several circulatory management therapies. Unfortunately, cardiac ... [more ▼]

Cardiac output is an important variable when monitoring hemodynamic status. In particular, changes in cardiac output represent the goal of several circulatory management therapies. Unfortunately, cardiac output is very difficult to estimate, either in experimental or clinical settings. The goal of this work is to compare four techniques to measure cardiac output: pressure-volume catheter, aortic flow probe, thermodilution, and the PiCCO monitor. These four techniques were simultaneously used during experiments of fluid and endotoxin administration on 7 pigs. Findings show that, first, each individual technique is precise, with a relative coefficient of repeatability lower than 7 %. Second, 1 cardiac output estimate provided by any technique relates poorly to the estimates from the other 3, even if there is only small bias between the techniques. Third, changes in cardiac output detected by one technique are only detected by the others in 62 to 100 % of cases. This study confirms the difficulty of obtaining a reliable clinical cardiac output measurement. Therefore, several measurements using different techniques should be performed, if possible, and all such should be treated with caution. [less ▲]

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See detailMEASUREMENT OF MOISTURE DIFFUSIVITY BY INVESTIGATION OF SORPTION ISOTHERM AND MODELING MOISTURE TRANSFER OF MORTAR SUBMITED TO CONVECTIVE DRYING
Kahlerras, Loubna ULg; BELHAMRI, Azeddine; Fraikin, Laurent ULg et al

in Proceedings of The 20th International Drying Symposium (IDS 2016) (2016, August 08)

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes ... [more ▼]

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes. The first experimental campaign was a convective dryer; in the purpose to obtain the drying curves of mortar and the influence of water to cement ratios (W/C) on drying kinetics. A second experimental campaign aims to characterize from textural and hydric point of view, the materials, by mean of DVS (dynamic vapor sorption) In order to obtain sorption cycles and identify the moisture diffusivity coefficient of mortar. The pore size distribution is obtained from sorption cycles and completed by MIP. The contribution of each components of the microstructure to the diffusion is studied. Finally X-ray microtomography is used to measuring the moisture content in the internal structure of mortars during drying. [less ▲]

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See detailThe Athena X-ray Integral Field Unit (X-IFU)
Barret, Didier; Trong, Thien Lam; den Herder, Jan-Willem et al

in Proc. SPIE. 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99052F. (August 17, 2016) (2016, August 01)

The X-ray Integral Field Unit (X-IFU) on board the Advanced Telescope for High-ENergy Astrophysics (Athena) will provide spatially resolved high-resolution X-ray spectroscopy from 0.2 to 12 keV, with 5 ... [more ▼]

The X-ray Integral Field Unit (X-IFU) on board the Advanced Telescope for High-ENergy Astrophysics (Athena) will provide spatially resolved high-resolution X-ray spectroscopy from 0.2 to 12 keV, with 5 arc second pixels over a field of view of 5 arc minute equivalent diameter and a spectral resolution of 2.5 eV up to 7 keV. In this paper, we first review the core scientific objectives of Athena, driving the main performance parameters of the X-IFU, namely the spectral resolution, the field of view, the effective area, the count rate capabilities, the instrumental background. We also illustrate the breakthrough potential of the X-IFU for some observatory science goals. Then we briefly describe the X-IFU design as defined at the time of the mission consolidation review concluded in May 2016, and report on its predicted performance. Finally, we discuss some options to improve the instrument performance while not increasing its complexity and resource demands (e.g. count rate capability, spectral resolution). The X-IFU will be provided by an international consortium led by France, The Netherlands and Italy, with further ESA member state contributions from Belgium, Finland, Germany, Poland, Spain, Switzerland and two international partners from the United States and Japan. [less ▲]

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See detailEnhancing Cover Song Identification with Hierarchical Rank Aggregation
Osmalsky, Julien ULg; Van Droogenbroeck, Marc ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the 17th International for Music Information Retrieval Conference (2016, August)

Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features ... [more ▼]

Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features, recent work tends to demonstrate that combining similarity estimators based on multiple audio features increases the performance. We improve this approach by using a hierarchical rank aggregation method for combining estimators based on different features. More precisely, we first aggregate estimators based on global features such as the tempo, the duration, the loudness, the beats, and the average chroma vectors. Then, we aggregate the resulting composite estimator with four popular state-of-the-art methods based on chromas as well as timbre sequences. We further introduce a refinement step for the rank aggregation called “local Kemenization” and quantify its benefit for cover song identification. The performance of our method is evaluated on the Second Hand Song dataset. Our experiments show an significant improvement of the performance, up to an increase of more than 200 % of the number of queries identified in the Top-1, compared to previous results. [less ▲]

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See detailModelling of multibody systems in the local frame
Bruls, Olivier ULg; Sonneville, Valentin

in Proceedings of the 24th International Congress of Theoretical and Applied Mechanics (ICTAM) (2016, August)

A local frame finite element approach is proposed to describe the kinematics of a flexible multibody system, derive the equations of motion and solve them numerically. It is argued that this approach ... [more ▼]

A local frame finite element approach is proposed to describe the kinematics of a flexible multibody system, derive the equations of motion and solve them numerically. It is argued that this approach leads to reduced geometric nonlinearities and improved computational efficiency. [less ▲]

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See detailOptimal design of flexible mechanisms using a generalized equivalent static load method
Tromme, Emmanuel; Sonneville, Valentin; Guest, James K. et al

in Proceedings of the 24th International Congress of Theoretical and Applied Mechanics (2016, August)

The equivalent static load (ESL) method is a powerful approach to solve dynamic response structural optimization problems. The method transforms the dynamic response optimization into a static response ... [more ▼]

The equivalent static load (ESL) method is a powerful approach to solve dynamic response structural optimization problems. The method transforms the dynamic response optimization into a static response optimization under multiple load cases. The ESLs are defined based on the transient analysis response whereupon all the standard techniques of static response optimization can be used. In the last decade, the ESL method has been applied to perform structural optimization of flexible components of mechanical systems modeled as multibody systems. This method considers the optimization of isolated component during the static response optimization. The present research proposes a generalized ESL method accounting for the entire system during the static response optimization, which enables to formulate the constraints with respect to the mechanism and not restricted to the individual components. The proposed method relies on a Lie group formalism which has appealing properties to derive efficiently the ESL. Examples validate the method. [less ▲]

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See detailLa légation des Pays-Bas en cour de Rome au temps de l’agent Laurent du Blioul (1573-1598): Une légation au cœur des réseaux de la monarchie de Philippe II
Regibeau, Julien ULg

in Actes du neuvième congrès de l'Association des Cercles francophones d'Histoire et d'Archéologie de Belgique (2016, August)

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See detailOn the compatibility equations in geometrically exact beam finite element
Sonneville; Bruls, Olivier ULg; Bauchau, Olivier A.

in Proceedings of the 12th International Conference on Multibody Systems, Nonlinear Dynamics and Control (MSNDC) within the ASME/IDETC/CIE Conference (2016, August)

This paper discusses the compatibility equations which relate the velocity field and the strain field in geometrically exact beam theory. The analysis is carried out in the context of intrinsic equations ... [more ▼]

This paper discusses the compatibility equations which relate the velocity field and the strain field in geometrically exact beam theory. The analysis is carried out in the context of intrinsic equations, namely the dynamic equilibrium equations are formulated in terms of velocity and strain only. In addition to the well established objectivity and path-independence requirements of the spatial discretization, these compatibility equations show that a consistent spatial interpolation of the velocity field should depend on the curvature of the beam, including initial curvature and curvature from the deformation, and it is shown that this consistency is connected to the ability of the element to represent rigid body motion velocity. A two node interpolation scheme is studied and it appears that, as the element gets smaller under mesh refinement, the effect of this dependency reduces, leading eventually to the classical linear shape functions. [less ▲]

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See detailFeasibility study of burning neat jatropha oil into a vaporizing burner for household applications.
Sartor, Kevin ULg; Makaire, Danielle; Fontaine, Jean-Marie et al

in Proceedings (2016, August)

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See detailInference in a stochastic SEIR model using Sequential Monte Carlo methods
Bonou, Wilfried ULg; LAMBERT, Philippe

in The 37th Annual Conference of the International Society for Clinical Biostatistics (ISCB): Book of Abstracts. Birmingham, UK, 21-25 August 2016 (2016, August)

Many biological, physical, chemical, economic, and social phenomena are dynamic and are modeled using (systems of) Ordinary Differential Equations (ODEs). But a more realistic way to describe these ... [more ▼]

Many biological, physical, chemical, economic, and social phenomena are dynamic and are modeled using (systems of) Ordinary Differential Equations (ODEs). But a more realistic way to describe these dynamics relies on Discrete Time Markov Chains (DTMC). There is a growing interest in the development of Bayesian statistical methods to infer on the parameters in such dynamic models, particularly those defining epidemic spread, by combining prior information with experimental or observational data. Our proposal aims to explore the merits of the Bayesian Optimal Filtering technique in the estimation of the parameters of a stochastic SEIR (S = Susceptible, E = Exposed, I = Infectious, R = Removed) epidemic model. State Space Models (SSMs) are used to describe the epidemic dynamic. The unknown static parameters are estimated using a combination of Sequential Monte Carlo techniques with a Markov Chain Monte Carlo algorithm, . . . [less ▲]

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See detailSmart co-phasing system for segmented mirror telescopes
Simar, Juan Felipe ULg; Stockman, Yvan ULg; Surdej, Jean ULg

in SPIE 9906, Ground-based and Airborne Telescopes VI (2016, July 27)

Space observations of fainter and more distant astronomical objects constantly require telescope primary mirrors with a larger size. The diameter of monolithic primary mirrors is limited to 10 m because ... [more ▼]

Space observations of fainter and more distant astronomical objects constantly require telescope primary mirrors with a larger size. The diameter of monolithic primary mirrors is limited to 10 m because of manufacturing and logistics limitations. For space telescopes, monolithic primary mirrors are limited to less than 5 m due to fairing capacity. Segmented primary mirrors thus constitute an alternative solution to deal with the steadily increase of the primary mirror size. The optical path difference between the individual segments must be close to zero (few nm) in order to be diffraction limited over the full telescope aperture. In this paper a new system that may co-phase 7 segments at once with the light of a star and without artificial one is proposed. First the measuring methods and feedback system is explained, then the breadboard setup is presented and the results are analyzed and discussed, finally a comparison with Keck telescope is performed. This system can be adapted in order to be used in the co-phasing system of future segmented mirrors, its dynamic range starts from several hundred of microns till some tenths of nanometers [less ▲]

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See detailArchitectural and Environmental Housing Typology Analysis in Huamachuco, Peru
Meliani, Houmam ULg; Teller, Jacques ULg; Attia, Shady ULg

in La Roche, Pablo; Schiler, Marc (Eds.) Passive and Low Energy Architecture Conference (2016, July 12)

This work focuses on the city of Huamachuco, a town 3200 meters above sea level in Northern Peru. The main aim of this study is to share and disseminate technological knowledge on architecture, building ... [more ▼]

This work focuses on the city of Huamachuco, a town 3200 meters above sea level in Northern Peru. The main aim of this study is to share and disseminate technological knowledge on architecture, building technology and lifestyle of Huamachuco inhabitants. The paper objective is to (1) highlight the concept of architectural quality in Huamachuco, (2) compare the living environment of existing traditional dwellings in comparison with newly constructed concrete dwellings, and to (3) identify the reasons for neglecting ecological construction technologies and materials in the new built environment. The research methodology went through different phases that range from qualitative data collection and quantitative measuring, to data analysis and findings reporting. Firstly, a typological study was conducted visiting 110 houses. The typological study enabled us to describe and understand the housing typologies and classify those under four major typologies according to their construction techniques: 1) adobe, 2) rammed earth, 3) concrete and 4) mixed technique. Secondly, detailed field studies were conducted for representative houses representing the four categories. Finally, 10 houses have been thoroughly audited for using measuring equipment to collect data related to temperature, relative humidity, carbon dioxide concentration, lighting intensity, and envelope thermography. [less ▲]

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See detailA Novel Methodology for Hybrid Fire Testing
Sauca, Ana ULg; Gernay, Thomas ULg; Robert, Fabienne et al

in Proceedings of the 6th European Conference on Structural Control (2016, July 11)

This paper describes a novel methodology for conducting stable hybrid fire testing (HTF). During hybrid fire testing, only a part of the structure is tested in a furnace while the reminded structure is ... [more ▼]

This paper describes a novel methodology for conducting stable hybrid fire testing (HTF). During hybrid fire testing, only a part of the structure is tested in a furnace while the reminded structure is calculated separately, here by means of a predetermined matrix. Equilibrium and compatibility at the interface between the tested “physical substructure” and the “numerical substructure” is maintained throughout the test using a dedicated algorithm. The procedures developed so far are sensitive to the stiffness ratio between the physical and the numerical substructure and therefore they can be applied only in some cases. In fire field, the stiffness of the heated physical substructure may change dramatically and the resulting change in stiffness ratio can lead to instability during the test. To overcome this drawback, a methodology independent of the stiffness ratio has been developed, inspired from the Finite Element Tearing and Interconnecting (FETI) method, which has been originally developed for substructuring in numerical analyses. The novel methodology has been successfully applied to a hybrid fire test in a purely numerical environment, i.e. the physical substructure was also modelled numerically. It is shown that stability does not depend on the stiffness ratio and that equilibrium and compatibility can be consistently maintained at the interface during the fire. Finally, the ongoing experimental program aimed at employing and experimentally validating this methodology is described. [less ▲]

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See detailL’argumentation de l’image scientifique : une affaire de méréologie
Dondero, Maria Giulia ULg

in Pollet, Marie-Christine; Glorieux, Carole (Eds.) Argumenter dans les écrits scientifiques (2016, July 07)

Ce texte vise à étudier, dans une perspective sémiotique, le discours scientifique de recherche et celui de la vulgarisation et notamment les images présentes dans ces deux genres de discours. Nous ... [more ▼]

Ce texte vise à étudier, dans une perspective sémiotique, le discours scientifique de recherche et celui de la vulgarisation et notamment les images présentes dans ces deux genres de discours. Nous examinons des travaux relevant de l’astrophysique et notamment la manière dont les images argumentent. Le corpus sera abordé à partir de la notion de rhétorique entendue comme un ensemble d’opérations méréologiques. Nous reprendrons à ce propos la théorie de l’iconicité de Jean-François Bordron, illustrée par ses deux derniers livres, L’iconicité et ses images (2011) ainsi qu’Image et vérité. Essais sur la dimension iconique de la connaissance (2013). [less ▲]

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See detailValidity and reliability of the French translation of the Patient-Related Tennis Elbow Evaluation Questionnaire
Kaux, Jean-François ULg; DELVAUX, François ULg; SCHAUS, Jean ULg et al

in Crossing borders through sport science (2016, July)

Background: The lateral elbow tendinopathy is a common injury in tennis players and physical workers. The Patient-Rated Tennis Elbow Evaluation (PRTEE) questionnaire was created to measure pain and ... [more ▼]

Background: The lateral elbow tendinopathy is a common injury in tennis players and physical workers. The Patient-Rated Tennis Elbow Evaluation (PRTEE) questionnaire was created to measure pain and functional disabilities specifically reported in patient with lateral epicondylitis (tennis elbow). Developed in English, this questionnaire has since then been translated into several languages but not in French. Objectives: The aims of the study were to translate and cross-culturally adapt the PRTEE questionnaire into French and to evaluate the reliability and validity of this new version of the questionnaire (PRTEE-F). Methods: The PRTEE was cross-culturally adapted into French according to the international guidelines. To assess the reliability and validity of the PRTEE-F, 115 participants filled in the PRTEE-F twice, and the Disabilities of Arm, Shoulder and Hand questionnaire (DASH) and the Short Form Health Survey (SF-36) once. Internal consistency (with Cronbach’s alpha), test-retest reliability (with intra-class correlation (ICC)), convergent and divergent validity (by calculating the Spearman’s correlation coefficients with the DASH and some sub scales of the SF-36, respectively) were assessed. Results: The PRTEE was translated in French without problem. PRTEE-F showed a good test-retest reliability for the overall score (ICC 0.83) and for each items (ICC 0.71-0.9) and a high internal consistency (Cronbach’s alpha = 0.98). The correlation analyses revealed high correlation coefficients between PRTEE-F and DASH (good convergent validity) and, as expected, a low or moderate correlations with the divergent subscales of the SF-36 (discriminant validity). There was no floor or ceiling effect. Conclusions: The PRTEE questionnaire was successfully cross-culturally adapted into French the PRTEE-F is reliable and valid for evaluating the French-speaking patient with lateral elbow tendinopathy. [less ▲]

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See detailImpact of a mountain ultra-marathon on cardiac biomarkers
Le Goff, Caroline ULg; Gergelé, Laurent; Kaux, Jean-François ULg et al

in Crossing borders through sport science (2016, July)

Objectives. While moderate exercise has beneficial effects on the cardiovascular system, consequences of a supra-physiological effort are not clear yet. In particular, the physiological consequences of ... [more ▼]

Objectives. While moderate exercise has beneficial effects on the cardiovascular system, consequences of a supra-physiological effort are not clear yet. In particular, the physiological consequences of ultramarathons need to be further documented. The aim of the study was to assess the changes of various cardiac biomarkers after a mountain ultra-marathon. Material and methods. Blood and urine samples were collected on 28 runners (17 men) participating to the Ultra-Trail du Mont Blanc (105km, total positive elevation: 5600 m) at 3 different times: before the race (Pre), within 1 h after the finish (Post) and 7 days after the finish (D+7). Several biomarkers involved in heart disease (coronary syndrome, heart failure and fibrosis) and in inflammation were assayed on different analyzers such a COBAS® (for CKMB,TnThs, NT-proBNP, H-FABP and CRPs) and KRYPTOR® (for Copeptin). ST2 was measured manually with the Presage kit from CRITICAL DIAGNOSTIC®. Results. Plasma levels of cardiac markers (CKMB, TnThs, NT-proBNP, copeptin, H FABP, ST2) and inflammation (CRPs) increased significantly at Post. Means values increased from Pre to Post as follows: 2.3 to 91.9 UI/L for CKMB (p<0.0001); 7.6 to 31.7 ng/L for TnThs (p<0.0001); 41.7 to 1190.5 ng/L for NT-proBNP, 4.2 to 22.9 pmol/L for copeptin (p=0.001); 3.6 to 107.8 ng/mL for H-FABP (p<0.0001), 29.7 to 126.2 ng/mL for ST2 (p<0.0001); 0.5 to 29.1 mg/L for CRPs (p<0.0001). With the exception of a few (H-FABP, ST2, CRPs) biomarkers in some subjects, all values were back to Pre values at D+7. Discussion-conclusion. Prolonged strenuous running exercise caused an elevation in cardiac biomarkers. Elevation in CK-MB levels lacks specificity for cardiac damage as runners have increased CKMB from skeletal muscles as well. Previous studies suggested that exercise induced TnThs elevation is a benign reversible physiologic phenomenon but this parameter, as well as H-FABP, could be a sign of ischemia. Different phenomena occurred such as stretch of myocytes causing an increase in pressure or volume and neurohormonal activation which can explain the Copeptine and NT-proBNP increase, while ST2 is a biomarker of cardiac remodeling and fibrosis. CRP is an acute phase compound that tends to increase following a strenuous and prolonged bout of exercise and/or muscular injury. As the values tended to return within the normal reference range values within 7 days after the race, our study suggests that there is no permanent structural damage at the myocardium level. [less ▲]

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See detailTowards an Observatory for Network Transparency Research
Neuhaus, Stephan; Münter, Roman; Edeline, Korian ULg et al

in Applied Networking Research Workshop (2016, July)

The Internet is full of middleboxes that change packets and flows. In fact, there is probably no IP or TCP header that is not affected by at least one middlebox. Obviously, middleboxes impede path ... [more ▼]

The Internet is full of middleboxes that change packets and flows. In fact, there is probably no IP or TCP header that is not affected by at least one middlebox. Obviously, middleboxes impede path transparency, i.e., the idea that an exchange of messages results in more or less the same packets, no matter what path the packets takes. But no one seems to have a truly global view of what middleboxes do to packets on what Internet paths, which would however be an essential knowledge for new transport protocols to be successfully deployed. We address these concerns in the MAMI project by building an observatory of path transparency measurements. The project hosts an extensive set of path transparency measurements - we believe it to be the first dataset to deal specifically with middlebox involvement. In this paper, we describe that Observatory and a number of questions that we want to address with the data in that Observatory. Eventually, the project will provide public access to that Observatory so that researchers and the interested public can ask their own questions about path transparency issues and middlebox involvement. [less ▲]

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See detailLeibniz et J.S. Bach
Dony, Arthur ULg

in Li, Wenchao (Ed.) "Für unser Glück oder das Glück anderer" : Vorträge des X. Internationalen Leibniz-Kongresses (2016, July)

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See detailTowards a Multipath TCP Aware Load Balancer
Lienardy, Simon ULg; Donnet, Benoît ULg

in Applied Networking Research Workshop (2016, July)

Multipath TCP has been recently introduced in order to allow a better resource consumption and user quality-of-experience. This is achieved by allowing a connection between two hosts through multiple ... [more ▼]

Multipath TCP has been recently introduced in order to allow a better resource consumption and user quality-of-experience. This is achieved by allowing a connection between two hosts through multiple subflows. However, with the rise of middleboxes and inherent Internet ossification, the large-scale deployment of this TCP extension is difficult. In particular, a load balancer at the entry point of a data center may forward subflows to different servers, canceling so the advantages of Multipath TCP. In this paper, we introduce MpLB, a Multipath TCP aware load balancer that fixes this particular issue without any modification to the Multipath TCP protocol itself. We demonstrate advantages of MpLB through a proof-of-concept. [less ▲]

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See detailSensitivity of the breaching process in the case of overtopping induced fluvial dike failure
Rifai, Ismail ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in River Flow 2016 Proceedings (2016, July)

Fluvial dikes are common structures constructed for flow channelization, prevention of river bed lateral migration and for flood protection purposes. Their aging increases their vulnerability to extreme ... [more ▼]

Fluvial dikes are common structures constructed for flow channelization, prevention of river bed lateral migration and for flood protection purposes. Their aging increases their vulnerability to extreme hydro-logical events, and subsequently may cause their failure. Many laboratory studies of overtopping induced dike failure were conducted, dealing mainly on normal configurations (i.e. dam break configuration) without ac-counting for the influence of a parallel flow. The fluvial dike breaching process remains, therefore, insuffi-ciently studied. A simplified model assuming a parameterized evolution of the breach geometry has been de-veloped to evaluate the fluvial breaching process. Results showed a sensitivity of the breaching process to the main channel configuration and to the flow conditions. Also, the evolution mode that was prescribed for the breach cross-section strongly influences the breaching duration and the sediment discharge [less ▲]

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See detailInventaire et typologie des listes grecques et latines de produits pharmaceutiques
Ricciardetto, Antonio ULg

in Derda, Tomasz; Lajtar, Adam; Urbanik, Jakub (Eds.) Proceedings of the XXVIIth International Congress of Papyrology. Warsaw, 29 July - 3 August 2013 (2016, July)

Dans la documentation papyrologique relative aux pratiques médicales de l’Égypte gréco-romaine et byzantine, le genre des listes de produits pharmaceutiques n’a encore jamais fait l’objet, ni d’un ... [more ▼]

Dans la documentation papyrologique relative aux pratiques médicales de l’Égypte gréco-romaine et byzantine, le genre des listes de produits pharmaceutiques n’a encore jamais fait l’objet, ni d’un inventaire, ni d’une étude exhaustifs. Dans le cadre de nos recherches doctorales sur la typologie des papyrus documentaires grecs et latins à caractère médical, c’est cette lacune que l’on se propose de combler, d’une part en cataloguant, au moyen de la fiche Mertens-Pack³ du CEDOPAL, la trentaine de listes de produits pharmaceutiques provenant d’Égypte, écrites en grec sur papyrus et ostracon (IIIe s. av. J.-Chr.-VIIe s. apr. J.-Chr.), auxquelles on ajoutera deux listes latines sur tablettes de bois, provenant du camp romain de Vindolanda (c. 100p), et, d’autre part, en analysant les aspects formels, paléographiques, textuels et contextuels de ces documents médicaux qui peuvent correspondre, soit à un inventaire de droguiste, soit à une commande, soit à une ou plusieurs recettes dont l’état fragmentaire du support a fait disparaître les proportions. On comparera les données obtenues avec d’autres pièces papyrologiques, spécialement les nombreuses prescriptions médicales, ainsi que les comptes, les reçus de paiement ou encore les lettres privées relatives à des demandes de médicaments ou à la livraison de substances pharmaceutiques. [less ▲]

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See detailLeveraging orientation knowledge to enhance human pose estimation methods
Azrour, Samir ULg; Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

in Articulated Motion and Deformable Objects AMDO 2016 (2016, July)

Predicting accurately and in real-time 3D body joint positions from a depth image is the cornerstone for many safety, biomedical, and entertainment applications. Despite the high quality of the depth ... [more ▼]

Predicting accurately and in real-time 3D body joint positions from a depth image is the cornerstone for many safety, biomedical, and entertainment applications. Despite the high quality of the depth images, the accuracy of existing human pose estimation methods from single depth images remains insufficient for some applications. In order to enhance the accuracy, we suggest to leverage a rough orientation estimation to dynamically select a 3D joint position prediction model specialized for this orientation. This orientation estimation can be obtained in real-time either from the image itself, or from any other clue like tracking. We demonstrate the merits of this general principle on a pose estimation method similar to the one used with Kinect cameras. Our results show that the accuracy is improved by up to 45.1 %, with respect to a method using the same model for all orientations. [less ▲]

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See detailFirst on-sky results with ARGOS at LBT
Orban De Xivry, Gilles ULg; Rabien, Sebastian; Busoni, Lorenzo et al

in First on-sky results with ARGOS at LBT (2016, July)

One year and an half after ARGOS first light, the Large Binocular Telescope (LBT) laser guided ground-layer adaptive optics (GLAO) system has been operated on both sides of the LBT. The system fulfills ... [more ▼]

One year and an half after ARGOS first light, the Large Binocular Telescope (LBT) laser guided ground-layer adaptive optics (GLAO) system has been operated on both sides of the LBT. The system fulfills the GLAO promise and typically delivers an improvement by a factor of 2 in FWHM over the 4'×4' field of view of both Luci instruments, the two near-infrared imagers and multi-object spectrographs. In this paper, we report on the first on-sky results and analyze the performances based on the data collected so far. We also discuss adaptive optics procedures and the joint operations with Luci for science observations. [less ▲]

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See detailApplications of the multiple timescale spectral analysis in wind engineering
Denoël, Vincent ULg

in Zingoni, Alphose (Ed.) Proceedings of the Sixth International Conference on Structural Engineering, Mechanics and Computation (2016, July)

The random response of civil engineering structures to the buffeting action of wind loads is typically composed of several components, usually referred to as the background component, in the low fre ... [more ▼]

The random response of civil engineering structures to the buffeting action of wind loads is typically composed of several components, usually referred to as the background component, in the low fre- quency zone and the resonant component(s) in the neighborhood of modal natural frequencies. It has become customary to study separately and add the contributions of these components to the total response, at least as far as the second order response (variance of structural responses) is concerned. Such a decomposition exists but is less usual for the computation of covariances of modal coordinates or of structural displacements, which are in turn necessary for the determination of internal stresses. The question of such a decomposition also holds for nonlinear systems, or even for the higher statistical moments of a linear structural system, should the response be non Gaussian. With very wide ranges of applicability, the Multiple Timescale Spectral Analysis summarizes under a unified framework recent works aiming at the development of such decompositions. This paper briefly pictures this particular theory based on perturbation methods, and provides illustrations of its applicability to the problems cited above. [less ▲]

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See detailNappe Vibration Mitigation Techniques for Free-overfall Structrures
Lodomez, Maurine ULg; Crookston, Brian M.; Tullis, Blake P. et al

in Full Proceedings: Hydraulic Structures and Water System Management (2016, June 27)

Nappe vibration is a phenomenon that has been witnessed in the field for a variety of different free overflow hydraulic structures operating at low heads, such as fountains, crest gates, and weirs. This ... [more ▼]

Nappe vibration is a phenomenon that has been witnessed in the field for a variety of different free overflow hydraulic structures operating at low heads, such as fountains, crest gates, and weirs. This phenomenon is visually characterized by oscillations in the thin nappe cascading downstream of the control structure. These oscillations can produce a significant level of noise and acoustic pressure waves, which can increase the environmental and societal impacts of the hydraulic structure. As a result, a detailed investigation has been undertaken to identify practical and effective mitigation solutions for free-overfall structures where nappe vibration may be of concern. Research is being performed with a prototype-scale linear weir (weir length of 3.5 m and fall height of 3 m) located at the Engineering Hydraulics laboratory of the University of Liège, to assess the effectiveness of various crest modifications and any corresponding impacts to hydraulic efficiency (i.e., flow rate). The test matrix includes the optimization (position and spacing of elements) of three mitigation solutions which are projecting bolts, deflectors and step. In addition, a high-speed camera and audio equipment have been used to evaluate effectiveness of the configurations in reducing nappe vibration. Finally, this practical study has identified countermeasures suitable for retrofits and new construction, easy to construct, durable, hydraulically efficient, and with minimal potential for debris collection. [less ▲]

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See detailReceding-Horizon Control of Distributed Generation to Correct Voltage or Thermal Violations and Track Desired Schedules
Soleimani Bidgoli, Hamid ULg; Glavic, Mevludin ULg; Van Cutsem, Thierry ULg

in Proceedings of the 19th PSCC (2016, June 23)

This paper presents a real-time, centralized control system acting on the active and reactive powers of distributed generators when the network experiences voltage and/or thermal limits violation. The ... [more ▼]

This paper presents a real-time, centralized control system acting on the active and reactive powers of distributed generators when the network experiences voltage and/or thermal limits violation. The control resorts on multi-step receding-horizon optimization. The objective is to minimize the deviations of Dispersed Generation Units (DGU) active and reactive powers from reference values. The reactive power corrections have priority over the active ones. Furthermore, the formulation is such that DGU powers are restored to their desired schedule as soon as operating conditions allow doing so. Three modes of operation of the proposed controller are presented, involving dispatchable units as well as DGUs operated to track maximum power output. The effectiveness of the proposed control is illustrated through detailed simulations of a 75-bus, 11-kV system hosting 22 DGUs. [less ▲]

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See detailOrganic Rankine cycle modelling and the ORCmKit library: analysis of R1234ze(Z) as drop-in replacement of R245fa for low-grade waste heat recovery
Ziviani, Davide; Dickes, Rémi ULg; Quoilin, Sylvain ULg et al

in Proceedings of ECOS 2016 (2016, June 20)

Due to the wide interest in organic Rankine cycles (ORCs) as a sustainable technology and the importance of numerical analyses and optimization procedures while considering such systems, we created a ... [more ▼]

Due to the wide interest in organic Rankine cycles (ORCs) as a sustainable technology and the importance of numerical analyses and optimization procedures while considering such systems, we created a dedicated open-source library named “ORC modelling Kit” (ORCmKit). The comprehensive library includes single com-ponents and overall models for subcritical, transcritical and supercritical ORCs. Three main programming environments are currently supported: Matlab, Python and EES (Engineering Equation Solver). A detailed steady-state cycle model of a small-scale regenerative ORC with a single-screw expander is used to evalu-ate the performance influence of R1234ze(Z) as a drop-in replacement of R245fa currently used in the instal-lation. The ORC system is used to recover low-grade waste heat with a temperature range between 90°C and 120°C. A thermal oil heater is used to simulate the heat source. A parametric study is carried out to in-vestigate the performance of the system throughout the range of interest in order to optimize the ORC with R1234ze(Z). [less ▲]

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See detailORCmKit: an open-source library for organic Rankine cycle modelling and analysis
Dickes, Rémi ULg; Ziviani, Davide; van den Broek, Martjin et al

in Proceedings of ECOS 2016 (2016, June 20)

As for many other technologies, modelling and simulation of organic Rankine cycles (ORCs) are crucial for design, optimization and control purposes. However, model development is often time consuming and ... [more ▼]

As for many other technologies, modelling and simulation of organic Rankine cycles (ORCs) are crucial for design, optimization and control purposes. However, model development is often time consuming and the scientific community lacks of open-access tools to study ORC systems. For these reasons, researchers from the universities of Liège and Ghent in Belgium gathered their knowledge and created “ORC modelling Kit” (ORCmKit), an open-source library dedicated to the steady-state simulation and analysis of organic Rankine cycles. Both component-level and cycle-level models are provided and different ORC architectures can be simulated. For each of the main component of ORC systems, different models are available with increasing complexity which allows a wide range of modelling possibilities. In order to remain general and accessible to as many people as possible, three widely used programming languages are covered within ORCmKit, i.e. Matlab, Python and EES (Engineering Equation Solver). Besides source codes, ORCmKit also includes calibration tools for empirical and semi-empirical models as well as a complete documentation for ease of use. [less ▲]

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See detailEvaluation of Adaptive Facades: The Case Study of AGC Headquarter in Belgium
Attia, Shady ULg; Bashandy, Hamza

in Belis, Jan; Louter, Christian (Eds.) Challenging Glass 5 (2016, June 17)

The evaluation of adaptive facades presents a challenge because there is no established evaluation strategy to systematically reach this goal and many of the available façade performance evaluation tools ... [more ▼]

The evaluation of adaptive facades presents a challenge because there is no established evaluation strategy to systematically reach this goal and many of the available façade performance evaluation tools have limited applicability for such advanced building facades. This paper presents a case study for an adaptive glass façade and evaluates its performance. The evaluation focuses mainly on pre and post construction phase of adaptive facades: The design assist phase (including the durability test, visual mockup, onsite panel mounting and weather stripping), the commissioning phase (field verification and performance testing) and the monitoring phase. The selected project is a nearly zero energy building with unique façade comprising thermal isolated glass sunshades printed with white silk screen. These louvers respond dynamically and automatically to the angle of the sun which improves the control over energy consumption, solar radiation and glare with the ability to admit natural light into the building. The paper is part of the research activities of working group 3 of the European COST Action 1403 on “Adaptive Facades “. Different methods were used for evaluation, this include: interviews with the architect, façade engineer and technical control specialist, reviews of standard and codes and a systematic process mapping. A documentation of the case study describing the post construction occupant comfort and façade operation was prepared. This paper’s audience is mainly architects, building façade engineers together with facility managers concerned with the process of design, construction and operation of adaptive glass facades. The outcome of this study identifies effective strategies for the design and performance evaluation of optimal adaptive facades. [less ▲]

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See detailFire fragility functions for community resilience assessment
Elhami Khorasani, Negar; Gernay, Thomas ULg; Garlock, Maria

in Garlock, Maria; Kodur, Venkatesh (Eds.) Structures in Fire (Proceedings of the Ninth International Conference) (2016, June 10)

This work provides a framework to evaluate the response of buildings in a community to fire following earthquake. As part of the framework, the paper discusses two methodologies: (1) how to develop fire ... [more ▼]

This work provides a framework to evaluate the response of buildings in a community to fire following earthquake. As part of the framework, the paper discusses two methodologies: (1) how to develop fire fragility functions; (2) how the fire fragility functions can be used in conjunction with an original fire ignition model to estimate the potential losses in a community from fire following earthquake. The paper focuses in particular on the development of fire fragility functions for an entire building to measure the probability of reaching a damage state given a fire scenario. Next, the paper proposes an ignition model to evaluate the probability of fire ignition after an earthquake. The ignition model together with fragility functions measure the probability of damage from fire following earthquake given an earthquake scenario. [less ▲]

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See detailConversion of visual post fire measurements into fire severity with the aid of thermo-plastic analysis for retrofitting
Molkens, Tom; Gernay, Thomas ULg; Van Coile, Ruben

in Garlock, Maria; Kodur, Venkatesh (Eds.) Structures in Fire (Proceedings of the Ninth International Conference) (2016, June 10)

At Koksijde in Belgium a severe fire took place in an apartment building in 2015, resulting in the death of a young man and visible structural damage to four balconies. Following the fire, experts were ... [more ▼]

At Koksijde in Belgium a severe fire took place in an apartment building in 2015, resulting in the death of a young man and visible structural damage to four balconies. Following the fire, experts were mandated to assess the damage and the need for structural repair. They estimated that the balconies had to be refurbished but that there were no other structural elements affected, in particular the slab inside the apartment could be left in place with only a surface treatment and new plaster finishing. However, the floor slab in the apartment located above the fire apartment exhibited several visual indications that the fire could have had a structural impact, such as residual deformations and cracks in the tiles. This paper presents a methodology to infer the fire severity based on post-fire measurements and non-linear thermo-plastic numerical simulations. Finally, knowing the fire severity, its effect on the structure is evaluated and a reliability-based assessment is made of the residual load bearing capacity of the slab. [less ▲]

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See detailCritical parameters in deriving fire fragility functions for steel gravity frames
Gernay, Thomas ULg; Elhami Khorasani, Negar; Garlock, Maria

in Garlock, Maria; Kodur, Venkatesh (Eds.) Structures in Fire (Proceedings of the Ninth International Conference) (2016, June 10)

Fire fragility functions can be used to characterize the probabilistic vulnerability of buildings to fire in the context of urban resilience assessment. A methodology has been proposed to develop such ... [more ▼]

Fire fragility functions can be used to characterize the probabilistic vulnerability of buildings to fire in the context of urban resilience assessment. A methodology has been proposed to develop such functions for multi-story steel buildings. However, a large number of parameters with uncertainties play a role in the process of constructing the fragility functions. The goal of this research is to identify the critical parameters that most affect the global fire safety by investigating the sensitivity of the fragility functions to different input parameters. Sensitivity in parameters affecting the fire model, the heat transfer process and the thermo-mechanical response is examined. The effects of different design assumptions at the system level are also studied. The presented approach is useful for selecting the prevailing parameters in a fire reliability analysis and it provides important information for modeling tools that can be used to evaluate resilience for fire scenarios. [less ▲]

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See detailTowards a standard measure of the ability of a structure to resist a natural fire
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

in Garlock, Maria; Kodur, Venkatesh (Eds.) Structures in Fire (Proceedings of the Ninth International Conference) (2016, June 10)

Fire brigades face a major threat when intervening in a building in fire: the possibility of structural collapse during the cooling phase of the fire, or soon thereafter. In the current approaches to ... [more ▼]

Fire brigades face a major threat when intervening in a building in fire: the possibility of structural collapse during the cooling phase of the fire, or soon thereafter. In the current approaches to structural fire engineering, the fire resistance rating (R) is generally the only measure taken into consideration to characterize the fire performance of structural elements, although this measure does not reflect the response in real fire conditions. In this work, a standard measure is proposed to characterize the ability of structural members to resist a natural fire including the decay phases. This measure yields information about the potential occurrence of delayed failure as a function of the duration of the fire before it started to decrease, whether by self-extinction or due to the action of the fire fighters. The paper presents the method to derive this new standard measure as well as results for different typologies of structural elements. Finally, the interpretation and practical consequences are discussed, in particular regarding the safety of fire fighters during an intervention. [less ▲]

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See detailStability in Hybrid Fire Testing
Sauca, Ana ULg; Gernay, Thomas ULg; Robert, Fabienne et al

in Garlock, Maria; Kodur, Venkatesh (Eds.) Structures in Fire (Proceedings of the Ninth International Conference) (2016, June 09)

Hybrid testing is an appealing technique to observe the behavior of an element in an experimental test while taking into account the interaction with the rest of the structure which is modelled ... [more ▼]

Hybrid testing is an appealing technique to observe the behavior of an element in an experimental test while taking into account the interaction with the rest of the structure which is modelled numerically. Being widely used in the seismic field, this technique has been recently proposed in the fire field. The purpose of this paper is to demonstrate that the loading control process may be unstable during the hybrid testing when using the methodology applied in former tests presented in the literature. The stability in the latter method depends on the stiffness ratio between the two substructures. For the purpose of discussion, a one degree-of-freedom elastic system is studied. To overcome the stability issues, a new method is presented, independent on the stiffness ratio. Finally, the hybrid testing of a 2D beam being part of a moment resisting frame is analyzed in a virtual environment (both parts being modeled numerically) using the “first generation method” and the new proposed method. [less ▲]

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See detailFire Resistance of Reinforced Concrete Columns Subjected to Standard Fire – Comparison of an Advanced and a Simplified Method
Achenbach, Marcus; Gernay, Thomas ULg; Morgenthal, Guido

in Garlock, Maria; Kodur, Venkatesh (Eds.) Structures in Fire (Proceedings of the Ninth International Conference) (2016, June 08)

For designing concrete columns subjected to a standard fire exposure, the Eurocode permits the use of simplified or advanced calculation methods. For the designer, the question of the respective ... [more ▼]

For designing concrete columns subjected to a standard fire exposure, the Eurocode permits the use of simplified or advanced calculation methods. For the designer, the question of the respective advantages of these two types of methods arises. Which situations demand the use of an advanced method? When does a simple method provide sufficient accuracy? In this paper, laboratory tests are recalculated using Finite Element Modeling (FEM) as an advanced and Extended Zone Model (EZM) as a simple method in order to investigate these questions. The recalculations indicate that the simple EZM is of sufficient accuracy for symmetric heated columns without restraints. In contrast, the mechanical behavior of columns heated on three sides demands an advanced method such as FEM to be properly described. [less ▲]

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See detailA Stochastic Multi-scale Model For Predicting MEMS Stiction Failure
Hoang Truong, Vinh ULg; Paquay, Stéphane; Golinval, Jean-Claude ULg et al

in Proceedings of the SEM XIII International Congress and Exposition on Experimental and Applied Mechanics. (SEMXIII 2016) (2016, June 06)

Adhesion is an important phenomenon in the context of MEMS for which the surface forces become dominant in comparison with the body forces. Because the magnitudes of the adhesive forces strongly depend on ... [more ▼]

Adhesion is an important phenomenon in the context of MEMS for which the surface forces become dominant in comparison with the body forces. Because the magnitudes of the adhesive forces strongly depend on the surface interaction distances, which in turn evolve with the roughness of the contacting surfaces, the adhesive forces cannot be determined in a deterministic way. To quantify the uncertainties on the structural stiction behavior of a MEMS, this work proposes a “stochastic multi-scale methodology”. The key ingredient of the method is the evaluation of the random meso-scale apparent contact forces, which homogenize the effect of the nano-scale roughness and are integrated into a numerical model of the studied structure as a random contact law. To obtain the probabilistic behavior at the structural MEMS scale, a direct method needs to evaluate explicitly the meso-scale apparent contact forces in a concurrent way with the stochastic multi-scale approach. To reduce the computational cost, a stochastic model is constructed to generate the random meso-scale apparent contact forces. To this end, the apparent contact forces are parameterized by a vector of parameters before applying a polynomial chaos expansion in order to construct a mathematical model representing the probability of the random parameters vector. The problem of miro-beam stiction is then studied in a probabilistic way. [less ▲]

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See detailNumerical Properties of a Discontinuous Galerkin formulation for electro-thermal coupled problems
Homsi, Lina; Geuzaine, Christophe ULg; Noels, Ludovic ULg

in Papadrakakis, M.; Papadopoulos, V.; Stefanou, G. (Eds.) et al Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering, Crete Island, Greece, 5–10 June 2016 (2016, June 05)

Discontinuous Galerkin (DG) methods are attractive tools to integrate several PDEs in engineering sciences, due to their high order accuracy and their high scalability in parallel simulations. The main ... [more ▼]

Discontinuous Galerkin (DG) methods are attractive tools to integrate several PDEs in engineering sciences, due to their high order accuracy and their high scalability in parallel simulations. The main interest of this work is to derive a constant and stable Discontinuous Galerkin method for two-way electro-thermal coupling analyses. A fully coupled nonlinear weak formulation for electro-thermal problems is developed based on continuum mechanics equations which are discretized using the Discontinuous Galerkin method. Toward this end, the weak form is written in terms of energetically conjugated fields gradients and fluxes. In order to validate the effectiveness of the formulation and illustrate the algorithmic properties, a numerical test for composite materials is performed. [less ▲]

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See detailY-a-t-il des contre-indications à l'examen ENMG ?
WANG, François-Charles ULg

in Echaniz-Laguna, Andoni (Ed.) ENMG 2016 (2016, June 02)

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See detailInfluence of propeller configuration on propulsion system efficiency of multi-rotor Unmanned Aerial Vehicles
Theys, Bart; Dimitriadis, Grigorios ULg; Hendrick, Patrick et al

in Proceedings of the International Conference on Unmanned Aircraft Systems, ICUAS 2016 (2016, June)

Multi-rotor Unmanned Aerial Vehicles make use of multiple propellers, mounted on arms, to produce the required lift. This article investigates the influence on propulsion system efficiency in hover due to ... [more ▼]

Multi-rotor Unmanned Aerial Vehicles make use of multiple propellers, mounted on arms, to produce the required lift. This article investigates the influence on propulsion system efficiency in hover due to the configuration of these propellers. Influence of pusher or puller configuration of the propeller, number of blades, shape and dimensions of the arm, coaxial and overlapping propellers, is presented. A dedicated test bench that allows testing of various experimental setups is designed and built in order to realistically represent multi-rotor arms. Test results show that a two-bladed pusher configuration is most efficient and slenderness of the arm has more influence on efficiency than shape. A coaxial propulsion system approaches the efficiency of a single-prop system at high disk loadings. Finally, interference effects due to overlapping propellers are discussed. [less ▲]

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See detailA TOPSAR Processor based on the Omega-K Algorithm: Evaluation with Sentinel-1 Data
Kirkove, Murielle ULg; Orban, Anne ULg; De Rauw, Dominique ULg et al

in A TOPSAR Processor based on the Omega-K Algorithm: Evaluation with Sentinel-1 Data (2016, June)

This paper presents a processor for the TOPS (Terrain Observation by Progressive Scans) imaging mode. TOPS signals have two characteristics that make the use of Stripmap SAR processors inconvenient, i.e ... [more ▼]

This paper presents a processor for the TOPS (Terrain Observation by Progressive Scans) imaging mode. TOPS signals have two characteristics that make the use of Stripmap SAR processors inconvenient, i.e., azimuth frequency and azimuth time foldings. This paper describes a processor based on the Omega-K (Ω-k) algorithm, combined with pre-processing by frequency unfolding and post-processing by time unfolding. Raw data acquired by Sentinel-1 have been used to assess the quality of image reconstruction [less ▲]

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See detailDevelopment of a semi-analytical model of volumetric expander for system-level simulation.
Oudkerk, Jean-François ULg

in Proceedings of ECOS 2016 (2016, June)

Organic Rankine cycles are particularly well suited for recovering energy from low-grade heat sources, such as industrial waste, engine exhaust gas or solar concentrated power. In ow-capacity systems ... [more ▼]

Organic Rankine cycles are particularly well suited for recovering energy from low-grade heat sources, such as industrial waste, engine exhaust gas or solar concentrated power. In ow-capacity systems, volumetric expanders are often preferred to turbomachines because of their reliability, robustness, low rotational speed and their ability to handle high pressure ratios… Different types of machines have been investigated and successfully tested by the uthors and tools have been developed in order to analyse experimental data. Semi-empirical odel was built to analyse losses, detect potential improvement and simulate performances. This paper present a simple and fastcomputing semi-analytical model useful for simulate dynamic system integrating volumetric expander. This model is validated on experimental data and compare to black-box model. [less ▲]

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See detailInfluence of the inter‐stage coupling flexibility on the dynamics of multi‐stage rotors
Nyssen, Florence ULg; Golinval, Jean-Claude ULg

in Proceedings of the ASME Turbo Expo 2016 (2016, June)

In this work, a characterization of the inter-stage coupling in a one-piece multi-stage bladed structure is performed. More particularly, the effect of the inter-stage coupling flexibility on the mode ... [more ▼]

In this work, a characterization of the inter-stage coupling in a one-piece multi-stage bladed structure is performed. More particularly, the effect of the inter-stage coupling flexibility on the mode-shapes is evaluated. To this purpose, the MAC matrix between the mono-stage and multi-stage modes is computed for different drum Young’s modulus of the inter-stage coupling. In parallel, the strain energy located in the blades and in the connecting structure is computed for different levels of inter-stage coupling. This enables to establish a criterion to determine when a multi-stage finite element analysis is necessary instead of only computing the different mono-stage models separately. This criterion is based on the localization of the energy in the structure. Numerical analyses are performed on a two-stages academic bladed structure. [less ▲]

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See detailOn the modeling of MMC for use in large scale dynamic simulations
Freytes, Julian; Papangelis, Lampros ULg; Saad, Hani et al

in Proceedings of the 19th PSCC (2016, June)

This paper focuses on simplified models of the Modular Multilevel Converter suitable for large-scale dynamic studies, in particular simulations under the phasor approximation. Compared to the existing ... [more ▼]

This paper focuses on simplified models of the Modular Multilevel Converter suitable for large-scale dynamic studies, in particular simulations under the phasor approximation. Compared to the existing literature, this paper does not a priori adopt the modeling approach followed for the original twolevel or three-level Voltage Source Converter. On the contrary, a model is derived following a physical analysis that preserves its average internal dynamic behavior. An equivalent control structure is proposed and various alternatives are highlighted. The proposed model with its controllers has been implemented in a phasor simulation software and its response has been validated against a detailed Electromagnetic Transient model. Finally, an illustrative example is presented with the application of the proposed model on a large grid consisting of AC areas interconnected with a multi-terminal DC grid. [less ▲]

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See detailA Gaussian mixture approach to model stochastic processes in power systems
Gemine, Quentin ULg; Cornélusse, Bertrand ULg; Glavic, Mevludin ULg et al

in Proceedings of the 19th Power Systems Computation Conference (PSCC'16) (2016, June)

Probabilistic methods are emerging for operating electrical networks, driven by the integration of renewable generation. We present an algorithm that models a stochastic process as a Markov process using ... [more ▼]

Probabilistic methods are emerging for operating electrical networks, driven by the integration of renewable generation. We present an algorithm that models a stochastic process as a Markov process using a multivariate Gaussian Mixture Model, as well as a model selection technique to search for the adequate Markov order and number of components. The main motivation is to sample future trajectories of these processes from their last available observations (i.e. measurements). An accurate model that can generate these synthetic trajectories is critical for applications such as security analysis or decision making based on lookahead models. The proposed approach is evaluated in a lookahead security analysis framework, i.e. by estimating the probability of future system states to respect operational constraints. The evaluation is performed using a 33-bus distribution test system, for power consumption and wind speed processes. Empirical results show that the GMM approach slightly outperforms an ARMA approach. [less ▲]

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See detailLe marquage et les soins vétérinaires appliqués aux camélidés d'après la documentation papyrologique grecque d’Égypte
Ricciardetto, Antonio ULg

in Gitton-Ripoll, Valérie (Ed.) La trousse du vétérinaire dans l'Antiquité et au Moyen Âge. Instruments et pratiques (2016, June)

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See detailDirect control service from residential heat pump aggregation with specified payback
Georges, Emeline ULg; Cornélusse, Bertrand ULg; Ernst, Damien ULg et al

in Proceedings of the 19th Power Systems Computation Conference (PSCC) (2016, June)

This paper addresses the problem of an aggregator controlling residential heat pumps to offer a direct control flexibility service. The service is defined by a 15 minute power modulation, upward or ... [more ▼]

This paper addresses the problem of an aggregator controlling residential heat pumps to offer a direct control flexibility service. The service is defined by a 15 minute power modulation, upward or downward, followed by a payback of one hour and 15 minutes. The service modulation is relative to an optimized baseline that minimizes the energy costs. The potential amount of modulable power and the payback effect are computed by solving mixed integer linear problems. Within these problems, the building thermal behavior is modeled by an equivalent thermal network made of resistances and lumped capacitances whose parameters are identified from validated models. Simulations are performed on 100 freestanding houses. For an average 4.3 kW heat pump, results show a potential of 1.2 kW upward modulation with a payback of 600 Wh and 150 Wh of overconsumption. A downward modulation of 500 W per house can be achieved with a payback of 420 Wh and 120 Wh of overconsumption. [less ▲]

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See detailUn outil e-Health pour tous ? Le cas de l'informatisation du dossier infirmier au sein d'un hôpital belge
Slomian, Cynthia ULg; Schoenaers, Frédéric ULg

in Lovis, Christian; Séroussi, Brigitte; Ugon, Adrien (Eds.) et al eSanté pour tous (2016, June)

Contexte. Les soins de santé en Belgique et ailleurs sont confrontés à deux réalités : l’augmentation de la demande de soins, d’une part, et la volonté de l’Etat de diminuer les dépenses de santé, d’autre ... [more ▼]

Contexte. Les soins de santé en Belgique et ailleurs sont confrontés à deux réalités : l’augmentation de la demande de soins, d’une part, et la volonté de l’Etat de diminuer les dépenses de santé, d’autre part. Dans ce contexte, l’e-Health est souvent présentée comme la solution qui permettra de rationaliser les moyens, mais également d’augmenter l’efficience du système. Cet article se propose d’étudier une facette de l’e-Health : l’informatisation du dossier infirmier au sein d’un hôpital belge. Méthodes. Le matériau empirique rassemble des entretiens semi-directifs (n=30), des heures d’observation du travail infirmier (n=25) ainsi que l’étude de documents organisationnels. L’analyse du matériau repose sur la sociologie de l’action organisée. Résultats. L’introduction de l’ordinateur provoque des changements, mais également la persistance de routines organisationnelles. Discussion. Les infirmières s’approprient le dossier infirmier informatisé et tentent de maximiser leur pouvoir au sein de l’organisation. Conclusion. Un outil informatique n’est jamais totalement contraignant. Les acteurs se saisissent des marges de manœuvre laissée par celui-ci pour maximiser leur pouvoir. L’appropriation contingente du dispositif est au cœur de cette démarche de changement. [less ▲]

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See detailModifying Indoor Facilities Appropriate to Children
Jidovtseff, Boris ULg; Delvaux, Anne ULg; Mornard, Manhattan ULg et al

in Book of abstracts AISEP 2016 (2016, June)

Introduction Physical literacy development during childhood is critical not only to favor sport performance outcomes but also to develop long term physical activity. It’s very important for children to ... [more ▼]

Introduction Physical literacy development during childhood is critical not only to favor sport performance outcomes but also to develop long term physical activity. It’s very important for children to move in a thinking way. Diversified activities are important to develop a large panel of fundamental motor skills and to stimulate perception. It is important for children to move, but it has to be done in a thinking way. Focus on inquiry With young children it is important to maximize active time, to develop fundamental motor skills and perception, to take into account inter-individual differences, to favor enjoyment, self-confidence and to guarantee optimal security. Most of these pedagogical challenges can be reached by appropriate instruction and by an adapted environment. Contribution There is clear evidence that modifying exercise facilities influence children’s behaviour with consequences for motivation, activity level and motor development. For 25 years a reflexive approach has been used at CEReKi (Liège, Belgium) in order to determine how indoor facilities can be modified with the aim to meet children needs and to favor motor development. Attractive circuits have been developed to stimulate specific motor skills (gymnastic, athletic or ball circuits). They were created to afford action possibilities and challenges for children to explore their own abilities for exercise. According to the children’s age and level of ability different pedagogical conditions can be provided: spontaneous play, guided discovery or structured games. Circuits have to be organised in such a way that children can do most exercises on their own. The arrangement of equipment offers multiple possibilities for movement, favouring active discovery for all children. The autonomy of children allows the teacher to move throughout the circuit and assist children by scaffolding their learning. Conclusion Our experience confirms that modifying indoor facilities is relevant for 3 to 8 years old children activities. [less ▲]

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See detailContext-dependent feature analysis with random forests
Sutera, Antonio ULg; Louppe, Gilles; Huynh-Thu, Vân Anh ULg et al

in Uncertainty In Artificial Intelligence: Proceedings of the Thirty-Two Conference (2016) (2016, June)

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See detailÉtude statistique de la syntaxe des lexèmes _chetif_, _dolent_, _las_ et _maleüré_ en français médiéval
Mazziotta, Nicolas ULg

in Mayaffre, Damon; Poudat, Céline; Vanni, Laurent (Eds.) et al JADT 2016 - Proceedings of the 13th International Conference on Statistical Analysis of Textual Data (2016, June)

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See detailMot à mot, brin par brin : les suites [Nom préposition Nom] comme indices de littérarité ?
Purnelle, Gérald ULg; Magri, Véronique; Legallois, Dominique

in Mayaffre, Damon; Poudat, Céline; Vanni, Laurent (Eds.) et al Statistical Analysis on Textual Data - Proceedings of 13th International Conference on Statistical Analysis of Textual Data (2016, June)

For the JADT 2012, we applied the text pattern theory to Noun-preposition-Noun (NpN) sequences, where both nouns surrounding the preposition are identical. Our working corpus was composed of texts from ... [more ▼]

For the JADT 2012, we applied the text pattern theory to Noun-preposition-Noun (NpN) sequences, where both nouns surrounding the preposition are identical. Our working corpus was composed of texts from the four main literary genres, memoirs (109 texts), novels (740 texts), poetry (191 texts) and theater (210 texts), 85 million words, sampled out of Frantext, a categorized database. That exploratory research allowed us to pinpoint the specific place of the NpN sequence, between language and discourse, its blooming into a full discursive pattern, able to produce a stylistic effect linked to lexical innovation, as well as its possible use as a generic litterarity marker. This paper aims at pursuing the work by extending the corpus and proposing new contrastive studies, showing the role of the NpN sequence as a litterarity marker. [less ▲]

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See detailMitigation of the torsional flutter phenomenon of bridge deck section during a lifting phase
Andrianne, Thomas ULg; De Ville De Goyet, Vincent ULg

in Mitigation of the torsional flutter phenomenon of bridge deck section during a lifting phase (2016, June)

This paper presents a complete analysis of the aeroelastic behaviour of a deck section during the construction stage of the Third Bosphorus Bridge in Istanbul, Turkey. The combination of the low torsional ... [more ▼]

This paper presents a complete analysis of the aeroelastic behaviour of a deck section during the construction stage of the Third Bosphorus Bridge in Istanbul, Turkey. The combination of the low torsional stiffness along the vertical axis and the unstable aerodynamic shape of the suspended deck section led to a torsional flutter instability for a low wind speed (9.6 m/s). This low critical wind speed was obviously very likely to occur on the site of construction, so that mitigation actions were be implemented. It was decided to cover partially the sides of the deck section in order to modify adequately its aerodynamic shape. It is demonstrated that the proposed aerodynamic counter-measures increase the critical torsional flutter wind speed up to 39.5 m/s (worst configuration), which is acceptable for the construction phase of the bridge. The proposed mitigation solution was implemented and no torsional oscillations were observed. [less ▲]

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See detailProbabilistic reliability management approach and criteria for power system real-time operation
Karangelos, Efthymios ULg; Wehenkel, Louis ULg

in Power Systems Computation Conference (2016, June)

This paper develops a probabilistic approach for power system reliability management in real-time operation where risk is a product of i) the potential occurrence of contingencies, ii) the possible ... [more ▼]

This paper develops a probabilistic approach for power system reliability management in real-time operation where risk is a product of i) the potential occurrence of contingencies, ii) the possible failure of corrective (i.e., post-contingency) control and, iii) the socio-economic impact of service interruptions to end-users. Stressing the spatiotemporal variability of these factors, we argue for reliability criteria assuring a high enough probability of avoiding service interruptions of severe socio-economic impact by dynamically identifying events of nonnegligible implied risk. We formalise the corresponding decision making problem as a chance-constrained two-stage stochastic programming problem, and study its main features on the single area IEEE RTS-96 system. We also discuss how to leverage this proposal for the construction of a globally coherent reliability management framework for long-term system development, midterm asset management, and short-term operation planning. [less ▲]

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See detailUpdating Failure Probability Of A Welded Joint In Offshore Wind Turbine Substructures
Mai, Anh Quang ULg; Sørensen, John D.; Rigo, Philippe ULg

in The 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE) (2016, June)

For offshore wind turbines, the support structure contributes with a significant part to the Levelized Cost Of Energy (LCOE). LCOE is the total cost to build and operate a whole offshore wind turbine ... [more ▼]

For offshore wind turbines, the support structure contributes with a significant part to the Levelized Cost Of Energy (LCOE). LCOE is the total cost to build and operate a whole offshore wind turbine structure over its lifetime divided by the total energy output of the wind turbine over that lifetime. That total expected cost of operation & maintenance may be lowered by application of reliability- and risk-based maintenance strategies and updating of the reliability based on e.g. inspections performed during the design lifetime. Updating the reliability (or alternatively the failure probability) of a welded joint can theoretically be done using Bayesian updating. However, for tubular joints in offshore wind turbine substructure when considering a two dimensional crack growth and a failure criterion combined brittle fracture and material strength, the updating is quite complex due to the wind turbine loading obtained during operation. This paper considers how the reliability (or the probability of failure) of welded steel details can be updated in the case where the fatigue failure is modelled by a fracture mechanics approach and a Failure Assessment Diagram (FAD) is used to define a limit state equation. Besides, it is shown how the probability of failure of fatigue critical joints can be updated for various inspection scenarios. A two dimensional bi-linear model is considered for the crack growth. Calculation of the crack depth and the crack length are coupled. The stress intensity factor is calculated following the sophisticated procedure in BS 7910:2005. The initial crack size, the yield and ultimate strengths of steel, the fracture toughness, the stress intensity factor, and the stress-ranges are considered as uncertain and modelled by random variables. The probability of detection is used to account for uncertainty in crack inspections. By using Monte Carlo simulations, stress-range histories are generated randomly and together with the calculated stress intensity factors used to check the limit state condition using the FAD approach. The probability of failure updating is done for three inspection scenarios: No crack detected; Crack detected and repaired; Crack detected but not repaired. The paper presents illustrative results for offshore wind applications for the three scenarios, including comparisons of application of the FAD approach for modelling the limit state equation with a ‘conventional’ approach where it is assumed that failure happens when crack-depth reaches the plate thickness or the stress intensity factor is equal to or larger than the fracture toughness of the material. Finally, it is discussed how application of the updating procedure can be used for inspection planning for offshore wind turbine support structures, and thus also for reducing the required safety factors at the design stage. [less ▲]

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See detailDas MOBAK-Netzwerk: Kulturvergleichende Perspektive aus acht europäischen Ländern
Scheuer, Claude; Cloes, Marc ULg; Colella, Dario et al

in Kaboth, Holger; Heim, Christopher; Prohl, Robert (Eds.) Bildungsforschung im Sport (2016, May 27)

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See detailDenCity: Zero Energy Light Weight Construction Households for Urban Densification
Amer, Mohamed ULg; Attia, Shady ULg

in Rencontres Universitaires de Génie Civil de l'AUGC (2016, May 25)

This paper is a part of an ongoing research in the field of sustainable urban densification through providing innovative solutions for zero energy light weight construction. The focus aim of this research ... [more ▼]

This paper is a part of an ongoing research in the field of sustainable urban densification through providing innovative solutions for zero energy light weight construction. The focus aim of this research is to identify the gaps in the construction solutions for roof stacking, to feed in the innovation pipeline of the European construction landscape in the coming years. This paper presents a comprehensive review of different case studies and efforts in the field of roof raising and its repetition potentials. Based on a structured review, 8 different cases from three different European countries were sorted, placing a variety of methods in comparison with each other. The main contribution of this review lies in the analyses of the existing information in this field and the classification of the different validated methods and approaches that has been used. Finally, despite the existing challenges, it was found that the concept of roof stacking can be widely spread and applied in different contexts. Future research is going to investigate possible solution and to formulate structured scientific approaches to widen its application. [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

in 34èmes Rencontres Universitaires de Génie Civil de l'AUGC, Liège, 25 au 27 mai 2016 (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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See detailLes lésions musculo-squelettiques de l’adolescent sportif
Kaux, Jean-François ULg

in 14èmes Journées de l’Enseignement Post-Universitaire de la Faculté de Médecine de Liège (2016, May 21)

Le développement des activités sportives augmente la fréquence des lésions musculo-squelettiques de l’adolescent. Ces lésions dépendent non seulement du mécanisme mais également de l’âge du sportif et de ... [more ▼]

Le développement des activités sportives augmente la fréquence des lésions musculo-squelettiques de l’adolescent. Ces lésions dépendent non seulement du mécanisme mais également de l’âge du sportif et de sa maturation osseuse, particulièrement des noyaux d’ossification. Les aphophysoses, ostéochondroses ou ostéodystrophies se manifestent par une douleur au niveau de l’insertion tendineuse sur le noyau d’ossification secondaire en croissance. Elles sont souvent provoquées par des contraintes en traction-cisaillement chez des enfants sportifs entre 3 et 16 ans. L’excès pondéral constitue également un facteur de risque. La guérison spontanée s’observe généralement après trois à 12, voire 18 mois d’évolution. La maladie de Sever est l’ostéodystophie du pied la plus fréquente ; elle touche le noyau postérieur du calcanéum, qui apparaît entre sept et dix ans et qui fusionne à la fin de la puberté (16–18 ans) et sur lequel s’insèrent le tendon d’Achille et le court fléchisseur plantaire. Les contraintes en traction et compression (réception de saut) sont importantes à ce niveau surtout chez les sportifs de sept à 15 ans pratiquant diverses impulsions (basket-ball, volley-ball, saut en longueur. . . ). La talalgie se manifeste lors de la pratique sportive. La douleur est bilatérale dans 60% des cas. Il faut rechercher des troubles de statique plantaire (pieds creux) régulièrement associés à la maladie de Sever. Le bilan radiologique reste souvent décevant et peu spécifique. Le diagnostic différentiel doit s’établir avec une tendinopathie achilléenne, une fracture du calcaneus, un kyste osseux, un ostéome ostéoïde, une ostéomyélite ou une éventuelle enthésopathie (spondylarthropathie). La base du traitement est le repos sportif en phase algique, l’usage de la cryothérapie, le port de talonnettes amortissantes ou encore la prise temporaire d’AINS (ibuprofène). Au niveau du genou, l’apophysose de croissance la plus fréquente est la maladie d’Osgood-Schlatter qui est plus fréquente chez les adolescents pratiquant des sports de sauts. Au niveau du bassin tous les noyaux d’ossifications peuvent être atteints et même être le site de fractures-avulsions lors de contractions musculaires excessives ou brutales car le cartilage de croissance présente une faiblesse locale par rapport aux structures musculo-tendineuses. L’ostéochondrite disséquante correspond à un noyau osseux séparé du corps de l’os et recouvert de cartilage normal ; localisée à la partie supéromédiale du talus ou au niveau des condyles fémoraux. Elle est souvent asymptomatique, voire entraine une discrète limitation douloureuse de la mobilisation mais entraine une douleur à la palpation locale. Elle nécessite cependant un traitement adéquat. En cas de lésion peu ou pas évolutive, une surveillance radiologique (IRM / arthroscanner) est suffisante. Chez le très jeune adolescent une immobilisation plâtrée de six semaines permettrait la fusion du noyau (au niveau du dôme talien). L’arthroscopie sera justifiée en cas de séquestre osseux afin de l’extraire, et ce, avec de bons résultats postopératoires. L’ostéosynthèse d’un noyau volumineux peut être également indiquée, les résultats restant plus aléatoires. En conclusion, la pathologie traumatique ou microtraumatique de l’adolescent sportif n’est pas rare et ne doit jamais être négligée. Toute douleur exige une exploration radiologique comparative afin de poser un diagnostic précis et d’entreprendre un traitement adéquat, le plus souvent conservateur. [less ▲]

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See detailGestion du risque d’érosion côtière en Côte d’Ivoire : Cas du déguerpissement dans la commune de Port-Bouët à Abidjan
Comoe, Raymond; Ozer, Pierre ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

L’Etat de Côte d’Ivoire a décidé, depuis 2011, de faire déguerpir les populations des zones à risques du District Autonome d’Abidjan afin de réduire les impacts des catastrophes naturelles. La dernière ... [more ▼]

L’Etat de Côte d’Ivoire a décidé, depuis 2011, de faire déguerpir les populations des zones à risques du District Autonome d’Abidjan afin de réduire les impacts des catastrophes naturelles. La dernière vaste opération de déguerpissement concerne l’assainissement du littoral dans la commune de Port-Bouët menacé, selon les autorités, par l’avancée de la mer. [...] [less ▲]

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See detailDémarrage et longueur de la saison de pluies dans la région de Kinshasa et risques induits
Makanzu Imwangana, Fils; Phuati, Giscard; Ozer, Pierre ULg et al

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

La détermination et la prévision du démarrage de la saison de pluies sont des questions cruciales à travers la RDC en général et en particulier dans l’hinterland de la ville de Kinshasa étant donné que ... [more ▼]

La détermination et la prévision du démarrage de la saison de pluies sont des questions cruciales à travers la RDC en général et en particulier dans l’hinterland de la ville de Kinshasa étant donné que l’agriculture y est pluviale. Elles permettent de déterminer le calendrier agricole, particulièrement le semis, et influence le rendement. La question qui se pose toujours est celle de savoir s’il y a un changement climatique dans la région de Kinshasa qui se traduirait par la variation de la saison des pluies de 1961 à 2010. Et si c’est le cas, quels en sont les impacts sur l’activité agricole et autres ? Cette étude mène une analyse de la variabilité interannuelle et décennale de la saison des pluies à partir de deux séries chronologiques dans la région de Kinshasa. [...] [less ▲]

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See detailPerceptions, des autorités nationales aux petits producteurs locaux, des changements climatiques en Equateur
Ozer, Pierre ULg; Perrin, Dominique ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

Lors de chaque conférence des parties (COP) à la Convention-cadre des Nations Unies sur les changements climatiques (CCNUCC), la question de l’adaptation des pays les plus vulnérables aux conséquences des ... [more ▼]

Lors de chaque conférence des parties (COP) à la Convention-cadre des Nations Unies sur les changements climatiques (CCNUCC), la question de l’adaptation des pays les plus vulnérables aux conséquences des dérèglements climatiques est incontournable. En 2009, lors de la COP15 de Copenhague, les pays développés dont la responsabilité historique des émissions de gaz à effet de serre est avérée se sont engagés à consacrer annuellement 100 milliards d’USD à partir de 2020 pour aider les pays en développement à réduire leurs émissions et s’adapter aux effets des changements climatiques. D’ici là, les pays du Nord se doivent de mettre en place des projets d’assistance aux pays du Sud sur cette thématique. Dans ce cadre, la Wallonie a lancé un programme de solidarité internationale « climat » dans le cadre d’un développement durable des pays partenaires du Sud. [...] [less ▲]

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See detailLa responsabilité climatique dans les défis urbains contemporains: évaluation et mise en contexte pour la ville de Bujumbura, Burundi
Nibigira, Léonidas; Ozer, Pierre ULg; Havenith, Hans-Balder ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

A Bujumbura, la capitale du Burundi, les préjudices liés aux risques naturels deviennent de plus en plus une réalité quotidienne. Les cas les plus ressentis sont ceux liés aux inondations, aux glissements ... [more ▼]

A Bujumbura, la capitale du Burundi, les préjudices liés aux risques naturels deviennent de plus en plus une réalité quotidienne. Les cas les plus ressentis sont ceux liés aux inondations, aux glissements de terrain et à l'érosion. Les épidémies relatives aux conditions sanitaires précaires deviennent de plus en plus récurrentes. [...] [less ▲]

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See detailCap-Haïtien ou comment construire le risque d’inondations en une décennie.
Gracius, Gracia Joseph; Ozer, Pierre ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

Cap-Haïtien, ville située au Nord d’Haïti, connait une multiplication sans précédent des inondations. Alors que certains observateurs sont tentés de blâmer les conséquences du changement climatique, nous ... [more ▼]

Cap-Haïtien, ville située au Nord d’Haïti, connait une multiplication sans précédent des inondations. Alors que certains observateurs sont tentés de blâmer les conséquences du changement climatique, nous tentons ici de démontrer que l’absence totale d’aménagement du territoire, la dégradation de l’environnement, l’inexistence de bonne gouvernance et l’exode rural sont les principaux ingrédients de la création d’un risque jadis exceptionnel. Cette recherche a pour objectif d’analyser l’évolution de l’extension urbaine dans deux milieux humides (la rivière Haut-du-Cap et la mangrove à Petite-Anse) de 2004 à 2016 et d’évaluer la perception du risque d’inondation par les populations locales. [...] [less ▲]

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See detailLe Criquet pèlerin sera-t-il le déclencheur de l’effondrement de l’Afrique de l’Ouest ?
Diallo, Youssouf; Sory, Cisse; Ozer, Pierre ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

Situé au cœur de l’Afrique de l’Ouest, le Mali est confronté ces dernières années à une succession de crises profondes : dégradation des conditions climatiques et environnementales, précarisation ... [more ▼]

Situé au cœur de l’Afrique de l’Ouest, le Mali est confronté ces dernières années à une succession de crises profondes : dégradation des conditions climatiques et environnementales, précarisation croissante de la sécurité alimentaire, développement de mouvements armés et terroristes dans le pays, instabilité institutionnelle, etc. Aussi, à l’instar de plusieurs pays de la région, le Mali fait périodiquement face aux invasions du Criquet pèlerin, Schistocerca gregaria (Forksål, 1775) (Orthoptera: Acrididae). Cet insecte redoutable est capable de passer d’une forme solitaire inoffensive à une forme grégaire vorace en formant des essaims et des bandes larvaires qui s’attaquent aux cultures et pâturages en provoquant des dégâts importants. [...] [less ▲]

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See detailPlace des pertes et préjudices liés aux changements climatiques dans les accords internationaux
Perrin, Dominique ULg; Ozer, Pierre ULg

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

Pour les pays les plus vulnérables, les « pertes et préjudices » (traduit de l’anglais « Loss and damage ») causés par les changements climatiques sont une question cruciale. Il n’existe pas de définition ... [more ▼]

Pour les pays les plus vulnérables, les « pertes et préjudices » (traduit de l’anglais « Loss and damage ») causés par les changements climatiques sont une question cruciale. Il n’existe pas de définition convenue des « pertes et préjudices », mais l’expression fait globalement référence à toute une série de dommages subis en raison du changement climatique et ne pouvant pas être évités par des efforts d’atténuation ou d’adaptation. La question est devenue l’un des principaux enjeux de la conférence des parties (COP) à la Convention-cadre des Nations Unies sur les changements climatiques (CCNUCC). Le récent « Accord de Paris » adopté en décembre 2015 lors de la COP21 de la CCNUCC a ouvert de nouvelles pistes pour la prise en considération de cette question. L’objectif de cet exposé introductif au colloque est bien de dresser un état des lieux complet sur les enjeux complexes liés à la prise en compte des « pertes et préjudices », tant sur les aspects scientifiques relevés par le Groupe d'experts intergouvernemental sur l'évolution du climat (GIEC) que sur les aspects économiques, sociaux et géopolitiques. [less ▲]

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See detailEvolution récente du trait de côte dans le Golfe de Guinée : Exemples du Togo et du Bénin
Ozer, Pierre ULg; Hountondji, Yvon-Carmen; de Longueville, Florence

in Ozer, Pierre; Ginesu, Sergio; Ozer, André (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques - Livre de résumés (2016, May 19)

L’interface terre-mer est un environnement extrêmement fragile. De par le monde, les littoraux sont menacés par une multitude de facteurs parfois naturels et le plus souvent anthropiques. Ainsi, aux ... [more ▼]

L’interface terre-mer est un environnement extrêmement fragile. De par le monde, les littoraux sont menacés par une multitude de facteurs parfois naturels et le plus souvent anthropiques. Ainsi, aux perturbations locales occasionnées aux zones côtières par les infrastructures portuaires, les barrages, les prélèvements de sédiments à même la plage ou encore l’extension urbaine, s’ajoutent les conséquences globales des changements climatiques, dont l’élévation certaine du niveau des océans et l’amplification probable de conditions météo-marines dévastatrices. Cet article évalue la récente évolution du trait de côte au Togo et au Bénin où plusieurs études localisées démontrent que les plages sableuses connaissent des modifications (accumulation ou érosion) majeures ces dernières décennies. Dans le but d’avoir une vision globale de la dynamique côtière sur les 170 kilomètres de plages de ces deux pays d’Afrique de l’Ouest, des images satellitaires à haute définition spatiale disponibles en open access sur Google Earth sont utilisées de manière diachronique. [...] [less ▲]

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See detailImpact de la vulnérabilité et de la résilience aux changements environnementaux sur la mobilité en Afrique de l'Ouest
Zickgraf, Caroline ULg; Vigil Diaz Telenti, Sara ULg; de Longueville, Florence et al

in Ginesu, Sergio; Ozer, André; Ozer, Pierre (Eds.) La géographie physique et les risques de pertes et préjudices liés aux changements climatiques (2016, May 19)

Du Sahel à la zone côtière, l’Afrique de l'Ouest connaît une variété de changements environnementaux résultant tant de processus lents que de chocs soudains. Ces changements influencent significativement ... [more ▼]

Du Sahel à la zone côtière, l’Afrique de l'Ouest connaît une variété de changements environnementaux résultant tant de processus lents que de chocs soudains. Ces changements influencent significativement les schémas de migration de populations dans et hors de l'Afrique de l'Ouest. Dans cette région où les ressources naturelles constituent la base des moyens de subsistance et de la sécurité alimentaire (pêche et agriculture), la relation entre les changements environnementaux et les vulnérabilités socio-économiques est particulièrement préoccupante. [...] [less ▲]

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See detailFUNCTIONAL SPECIFICATION METHODOLOGY FOR AN ARCHITECTURAL MODELER SUPPORTING A MODULAR CONSTRUCTIVE SYSTEM
Boulanger, Christelle ULg; Rahhal, Anabelle ULg; Delfosse, Vincent ULg et al

in Design2016 (2016, May 16)

This article presents a methodological approach which helped the software development of an architectural modeler that aims to support the life cycle of buildings with a modular construction system. The ... [more ▼]

This article presents a methodological approach which helped the software development of an architectural modeler that aims to support the life cycle of buildings with a modular construction system. The modeler assists the building composition processes, the production of useful documents like drawing plans, quantities and specifications, and the evaluation of the thermal performance of the building at any phase of its design. Conducted within a multidisciplinary team of architects engineers, computer engineers and ergonomists, this methodology is based on a constant interaction between the various skills, so that the different perspectives are systematically integrated into the decision process. The methodology is based on the analysis of three fields of functions (composition - production and evaluation) which are considered simultaneously through a theoretical framework stemming from ergonomics: Activity Theory [Engeström 1987]. At first, the software development context is presented. Then, the choice of the Activity Theory as a framework for the analysis will be motivated. The next section relates the multiple concepts of the methodology to each others, in order to identify the principles as well as the inputs and the outputs. Each step in its implementation is then described, followed by the results in terms of the software interface. Finally, the discussion that will follow will consider the contributions and limitations of this methodological approach in the understanding of a system, in order to offer an efficient IT support. [less ▲]

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See detailCentralized Model Predictive Control of Multi-Terminal Direct Current Grids
Papangelis, Lampros ULg

in Proc. of the 8th IEEE Benelux Young Researchers Symposium 2016 (2016, May 12)

This work describes a centralized control for Multi-Terminal Direct Current (MTDC) grids. It is based on Model Predictive Control (MPC) whose aim is to satisfy a desired schedule, while avoiding or ... [more ▼]

This work describes a centralized control for Multi-Terminal Direct Current (MTDC) grids. It is based on Model Predictive Control (MPC) whose aim is to satisfy a desired schedule, while avoiding or correcting any system limit violation. The central controller collects voltage and power measurements from the converters of the system in regular intervals and sends back converter power setpoints. The latter are calculated by solving a quadratic programming problem subject to linear constraints and using a simplified model for the DC system. In addition, the overall MTDC grid control structure including the local and the centralized controllers is described. [less ▲]

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See detailCombined Centralized and Local Voltage correction in Active Distribution Network
Soleimani Bidgoli, Hamid ULg

in Combined Centralized and Local Voltage correction in Active Distribution Network (2016, May 12)

This paper presents a two-level real-time voltage control scheme to address the voltage violations in distribution grids hosting a significant number of Dispersed Generation Units (DGUs). The proposed ... [more ▼]

This paper presents a two-level real-time voltage control scheme to address the voltage violations in distribution grids hosting a significant number of Dispersed Generation Units (DGUs). The proposed scheme consists of a centralized and a local reactive power control. The local control provides fast response after a disturbance, reducing its impact and enhancing voltage quality. The centralized control relies on Model Predictive Control (MPC). It uses measurements collected throughout the network to bring the voltages inside desired limits. To do so, it adjusts in a coordinated way the reactive power set-points of the DGUs taking into account the local controls. The control method effectiveness has been evaluated on a 75-bus 11-kV test system hosting 22 DGUs. [less ▲]

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See detailOn the Laser Cladding of Ti Alloy Ti-6Al-4V with Low Laser Power
Mertens, Anne ULg; Paydas, Hakan ULg; Tchuindjang, Jérôme Tchoufack ULg et al

in Ventakesh, V.; Pilchak, A.L.; Allison, J.E. (Eds.) et al Proc. of the 13th World Conference on Titanium (2016, May 06)

Laser cladding is an economic layer-by-layer near-net-shape process for the production and the repair of metallic parts. In this process, a metallic powder is projected onto a substrate while being molten ... [more ▼]

Laser cladding is an economic layer-by-layer near-net-shape process for the production and the repair of metallic parts. In this process, a metallic powder is projected onto a substrate while being molten by a laser beam. Laser sources with fairly high power – i.e. typically 2kW − are often used to ensure short building times and high productivity. However, this approach has limitations. Indeed, it is very difficult to produce thin walls at high laser power. Moreover, an increase of the incident energy may give rise to a relatively coarser microstructure, and this will in turn affect the mechanical properties of the component. In order to address these issues, this paper aims at assessing the potential of a laser source with a lower maximum power of 300W to enhance the flexibility of the process. Two types of samples – i.e. thin walls or bulk deposits − were produced at low laser power from alloy Ti-6Al-4V. Their geometry, microstructures and local hardness are characterised and correlated with the thermal history experienced during fabrication. [less ▲]

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See detailGender, Jobs and Empowerment in Vietnamese Small Enterprises of Traditional Handicraft: Case Study in the Periphery of Hanoi
Nguyen, Thi Thu Hien ULg; Lebailly, Philippe

in The 2nd World Conference on Women’s Studies WCWS - 2016, 5th – 6th May, 2016 Colombo, Sri Lanka (2016, May 05)

Women are the main workforce of traditional craft sector in Vietnam. They not only actively participate in production, but also succeed in leading enterprises as managers. Even though women contribute ... [more ▼]

Women are the main workforce of traditional craft sector in Vietnam. They not only actively participate in production, but also succeed in leading enterprises as managers. Even though women contribute much to the achievement of companies, they face many constraints in working places due to theories of Confucianism and Buddhism. This research aims at answering two questions: (i) whether or not gender inequality exists in small scale craft enterprises and, (ii) how is empowerment the women employees in the firms. Both qualitative and quantitative methodologies are applied to collect information in order to clarify the research questions. Qualitatively, ethnographic approach is employed. It is explained that since 2014 the researchers go to the study areas to survey employment in the enterprises. In addition, participatory observation and oral history recording were also used to collect information (evidence) of gender inequality in employment and women empowerment in rural companies. Cross checking and supplementing were used for gathering information from communal leaders, women unions’ leaders and local residents. Quantitatively, descriptive statistics were used to analysis labor force, gender and employment of 50 enterprises in 3 traditional artisanal communes in Vietnam to find out gender inequality. Based on the result of analysis, some policy implications will be recommended to empower women as well as to reduce gender inequality in the small enterprises in rural areas [less ▲]

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See detailFucoidan: a marine polysaccharide for SPECT diagnosis of thrombosis
Chollet, Lucas; Saboural, Pierre; Rouzet, François et al

in Frontiers (2016, May)

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See detailPermutations and negative beta-shifts
Charlier, Emilie ULg; Steiner, Wolfgang

in Actes de Numeration 2016 (2016, May)

Elizalde (2011) characterized which permutations can be obtained by ordering consecutive elements in the trajectories of (positive) beta-transformations and beta-shifts. We prove similar results for ... [more ▼]

Elizalde (2011) characterized which permutations can be obtained by ordering consecutive elements in the trajectories of (positive) beta-transformations and beta-shifts. We prove similar results for negative bases beta. [less ▲]

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See detailDealing with crop rotation in agroforestry: the impact of shade on winter wheat and sugar beet growth and yield under belgium conditions
Artru, Sidonie ULg; Garré, Sarah ULg; Hiel, Marie-Pierre ULg et al

in Book of Abstract- 3rd European Agroforestry Conference 2016 (2016, May)

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See detailInflammation et alimentation: des pistes intéressantes
Knapp, Emilie ULg; Guyot, Hugues ULg

in SNGTV (Ed.) Journées Nationales des GTV: Nutrition et pratique vétérinaire, du b.a.-ba à l'innonvation (2016, May)

Les processus inflammatoires sont déclenchés lors d'une agression et font partie intégrante du système immunitaire. La problématique réside lorsque ces processus inflammatoires ne sont plus contrôlés et ... [more ▼]

Les processus inflammatoires sont déclenchés lors d'une agression et font partie intégrante du système immunitaire. La problématique réside lorsque ces processus inflammatoires ne sont plus contrôlés et provoquent plus de lésions que l'agression elle-même. Cette inadéquation des réactions inflammatoires aggravent souvent des pathologies comme les mammites, les métrites ou les pathologies métaboliques. La quantité et la qualité de l'alimentation, ainsi que le statut métabolique sont des points majeurs de régulation du système inflammatoire. En effet, de nombreuses molécules intervenant dans l'inflammation sont des protéines synthétisées par le foie ou sont dérivés des acides gras alimentaires. En début de lactation, la mobilisation graisseuse et les corps cétoniques ont une action directe sur l'activité inflammatoire ce qui expliquent l'état de stress oxydatif, la chute d'immunité ainsi que l'état pro-inflammatoire des vaches en post-partum. La digestion ruminale et intestinale des hydrates de carbone et des protéines peuvent également provoquer et réguler l'état inflammatoire systémique du ruminant. L'acidose chronique en est un exemple, cependant, l'alcalose et la mal-digestion des fibres peuvent également provoquer de l'inflammation. En pratique, il existe des paramètres qui permettent d'évaluer l'inflammation d'un animal et d'un troupeau. A l'aide d'une prise de sang et de dosage des protéines totales plasmatiques et sériques on pourra facilement et à des coûts limités, mesurer la présence d'inflammation aiguë ou chronique. La présence d'inflammation chronique est un facteur de risque sous-jacent important dans nos troupeaux de vaches laitières puisqu'il concerne environ 25% des troupeaux qui ont présenté des problèmes de défaut d’efficience alimentaire. Dans les troupeaux avec des signes cliniques de type amaigrissement, sous-production, mal-digestion des fibres et inflammation chronique, l'acidose chronique n'a été diagnostiquée que sur 5% des vaches alors que l'inactivité ruminale a été montrée sur 40% des animaux. Cette inactivité est souvent liée à un déficit en matière organique fermentescible couplée avec un excès de protéines fermentescible ce qui entraine des pH élevés et diminue la multiplication de la flore du rumen. L'analyse du jus de rumen, couplée avec celle des protéines totales permet dans la plupart des cas de poser un diagnostic et de discriminer les cas de SARA des cas de maldigestion et adapter correctement la ration. [less ▲]

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See detailElectromagnetic Investigation of the Pb-Zn deposit of Lontzen, Belgium
Evrard, Maxime ULg; Pirard, Eric ULg; Nguyen, Frédéric ULg

in First International Conference: MINING IN EUROPE, ABTSRACT volume (2016, May)

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See detailEnergy Reduction in Public Building Stock: Assessing the Impact of Control Strategy over Expected Energy Savings and Indoor Comfort Level
Ruiz Flores, Roberto ULg; D’Antoni, Matteo; Lemort, Vincent ULg

in CLIMA 2016 - proceedings of the 12th REHVA World Congress: volume 1. Aalborg: Aalborg University, Department of Civil Engineering. (2016, May)

In the framework of EU FP7 BRICKER project, the renovation of public owned nonresidential buildings is addressed through the installation of innovative passive and active technologies. The expected impact ... [more ▼]

In the framework of EU FP7 BRICKER project, the renovation of public owned nonresidential buildings is addressed through the installation of innovative passive and active technologies. The expected impact is a primary energy reduction of about 50% with respect to the existing scenario with a large replication potential under different European countries. In order to achieve such ambitious goal one issue that cannot be ignored is the effect of control strategy, not only over the resulting energy performance but also over the resulting indoor comfort conditions. In this paper, the actual control strategy implemented in the Belgian demo of Bricker project is introduced, compared against an ideal approach and accordingly optimized. The resulting proposed approach is then tested by means of numerical simulations over a base case scenario before renovation. The main conclusion of this work is the demonstration that control strategy of energy generation and distribution systems has to be revised whenever deep renovation of passive or active building technologies is undertaken. Contrarily to which, project renovation goals cannot be met. [less ▲]

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See detailDeep Background Subtraction with Scene-Specific Convolutional Neural Networks
Braham, Marc ULg; Van Droogenbroeck, Marc ULg

in International Conference on Systems, Signals and Image Processing, Bratislava 23-25 May 2016 (2016, May)

Background subtraction is usually based on low-level or hand-crafted features such as raw color components, gradients, or local binary patterns. As an improvement, we present a background subtraction ... [more ▼]

Background subtraction is usually based on low-level or hand-crafted features such as raw color components, gradients, or local binary patterns. As an improvement, we present a background subtraction algorithm based on spatial features learned with convolutional neural networks (ConvNets). Our algorithm uses a background model reduced to a single background image and a scene-specific training dataset to feed ConvNets that prove able to learn how to subtract the background from an input image patch. Experiments led on 2014 ChangeDetection.net dataset show that our ConvNet based algorithm at least reproduces the performance of state-of-the-art methods, and that it even outperforms them significantly when scene-specific knowledge is considered. [less ▲]

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See detailAnalysis of the flexibility of Belgian residential buildings equipped with Heat Pumps and Thermal Energy Storages
Georges, Emeline ULg; Garsoux, Pierre; Masy, Gabrielle et al

in Proceedings of CLIMA2016 Conference (2016, May)

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See detailIdentification des besoins des mères dans l’année suivant leur accouchement : une étude qualitative.
Slomian, Justine ULg; EMONTS, Patrick ULg; Vigneron, Lara et al

in 44èmes Assises Nationales des Sages-Femmes (2016, May)

Contexte de l’étude : La grossesse et l’accouchement sont deux étapes fondamentales dans la vie d’une femme. Plusieurs études ont montré que le malaise psychologique était relativement fréquent dans ... [more ▼]

Contexte de l’étude : La grossesse et l’accouchement sont deux étapes fondamentales dans la vie d’une femme. Plusieurs études ont montré que le malaise psychologique était relativement fréquent dans l’année suivant un accouchement. Objectifs : L’objectif de cette étude était de déterminé les besoins des mères dans l’année suivant leur accouchement (qu’elles aient vécu un épisode psychologique pathologique ou non). Méthode : Plusieurs étapes qualitatives ont été entreprises dans cette étude. Premièrement, nous avons conduit 22 entretiens individuels et un focus group réunissant des mères ayant vécu ou non un épisode de détresse psychologique. Nous avons ensuite mené deux autres focus : un avec des professionnels de la santé, l’autre avec des pères. Le but était de comparer les besoins maternels avec la perception des professionnels ainsi que des pères. Règles éthiques : Cette étude a reçu l’accord du comité d’éthique hospitalo-facultaire du CHU de Liège sous le numéro : 2015/48. Chaque participante a signé un formulaire de consentement éclairé quant à sa participation à l’étude ainsi qu’à l’autorisation de diffuser les résultats de façon confidentielle. Résultats : Les besoins des mères après leur accouchement ont été classés en 4 grandes catégories : le besoin d’information, le besoin de soutien psychologique, le besoin de partage d’expériences et le besoin de support matériel et pratique. Les femmes ne se sentent pas assez informées dans cette période de vie difficile. Elles ne se sentent pas non plus assez soutenues au point de vue psychologique mais également dans les tâches ménagères. Elles sont souvent fatiguées et se posent beaucoup de questions. Elles ont besoin de partager cette expérience de vie et elles ont besoin d’être rassurées et de se sentir comprises. Il semblerait qu’il y ait des différences de vécu d’expériences entre les mères et les professionnels mais également entre les mères et les pères. Conclusion : L’arrivée d’un bébé est une étape importante dans la vie d’une femme et d’un couple. Cela demande un remaniement tant sur les plans physique que psychologique et social. Les mères semblent ressentir un manque de support à différents niveaux au cours de la période postnatale. Cette étude procure des pistes pour répondre à leurs besoins et tenter de prévenir le risque de détresse psychologique dans la période postnatale. [less ▲]

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See detailModelling and Emulation of an Unbalanced LV Feeder with Photovoltaic Inverters
López-Erauskin, Ramón; Gyselinck, Johan; Olivier, Frédéric ULg et al

in Proc. of 8th IEEE Benelux Young researchers symposium in Electrical Power Engineering (2016, May)

In this paper, the penetration of grid-connected pho- tovoltaic systems is studied, experimentally tested and compared to simulation results. In particular, how the inverse current flow and unbalance ... [more ▼]

In this paper, the penetration of grid-connected pho- tovoltaic systems is studied, experimentally tested and compared to simulation results. In particular, how the inverse current flow and unbalance situations affect the voltage in the low-voltage grid. Thus, a test platform has been developed for obtaining experimental results with grid-tied commercial inverters. Photo- voltaic arrays are emulated and subjected to different irradiance profiles and the inverters are controlled to produce at different power conditions. A model has been developed in order to repro- duce the same operating conditions and working environment. Simulations are performed with the software PowerFactory and the results compared to the experimental ones. [less ▲]

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