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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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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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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 detailINFLUENCE OF LOCAL BUCKLING ON THE SHEAR RESISTANCE OF BOLTED CONNECTIONS FOR TUBULAR RACKING STRUCTURES
D'Antimo, Marina ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg et al

in THE INTERNATIONAL COLLOQUIUM ON STABILITY AND DUCTILITY OF STEEL STRUCTURES, Timisoara 30 May-01 June 2016 (2016, May)

The competition in the field of storage racking structures is so that companies are always look-ing for new structural solutions aiming at containing construction time and expenses. This pa-per focuses ... [more ▼]

The competition in the field of storage racking structures is so that companies are always look-ing for new structural solutions aiming at containing construction time and expenses. This pa-per focuses the bearing failure of shear joint using long bolts through thin tubular members with the purpose to check the reliability of Eurocode 3 formulation. The used hollow sections are free to buckle inward leading to a bearing resistance lower than the one predicted using EC3. In fact EC3 does not account for the possible occurrence of out-of-plane deformations in shear connection assuming that the connected plates are restrained by the bolt head and the nut. In order to investigate this phenomenon, an experimental campaign has been developed, a FE model Abaqus/CAE has been validated and a parametric study has been performed. The present paper introduces the conducted investigations. [less ▲]

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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 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 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 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 detailANALYTICAL PREDICTION OF THE BEARING RESISTANCE OF BOLTED CONNECTIONS FOR TUBULAR RACKING STRUCTURES
Armenante, Vittorio; D'Antimo, Marina ULg; Demonceau, Jean-François ULg et al

in THE INTERNATIONAL COLLOQUIUM ON STABILITY AND DUCTILITY OF STEEL STRUCTURES, Timisoara 30 May-01 June 2016 (2016, May)

The aim of this paper is to provide a formulation able to predict the resistance of simple shear connections realized by fastening a plate to a hollow square section by means of long bolts. The research ... [more ▼]

The aim of this paper is to provide a formulation able to predict the resistance of simple shear connections realized by fastening a plate to a hollow square section by means of long bolts. The research is motivated by the fact that the rules currently provided by EC3 for defining the bearing resistance of steel connections are limited to the case of stacks of plates, where every plate composing the connection is always restrained out of plane by the adjoining plate or by the bolt head or nut. This is a condition not verified in case of connections realized with long bolts fastening hollow sections. The work is organized in two sections. First, the results of an experimental campaign are presented and successively, the results of a parametric analysis carried out by means of a Finite Element model calibrated on the experimental data are reported. Afterwards, an analytical approach able to include the local buckling effects arising in these kinds of connections is presented, proposing a coefficient for the reduction of the resistance, to be included in the EC3 formulation. [less ▲]

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See detailAre crop models able to efficiently simulate crop growth under shade?
Artru, Sidonie ULg; Dumont, Benjamin ULg; Lassois, Ludivine ULg et al

in Gosme, Marie (Ed.) 3rd European Agroforestry conference 2016 - Book of abstracts (2016, May)

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See detailLe droit du travail (re)visité par la Cour constitutionnelle
Kéfer, Fabienne ULg

in Boufflette, Sophie (Ed.) La cour constitutionnelle. De l'art de modeler de droit pour préserver l'égalité (2016, April 29)

L'étude porte sur le rôle de la Cour constitutionnelle dans l’édification du droit du travail. Arrêt après arrêt, elle consolide la norme attaquée ou au contraire redessine – ou presse le législateur de ... [more ▼]

L'étude porte sur le rôle de la Cour constitutionnelle dans l’édification du droit du travail. Arrêt après arrêt, elle consolide la norme attaquée ou au contraire redessine – ou presse le législateur de redessiner – les contours de cette branche du droit fortement marquée par son histoire. Elle se penche sur un peu plus de trente arrêts prononcés par la Cour constitutionnelle, principalement depuis 2008, dans les domaines suivants : le travail à temps partiel (chapitre 1), le droit de la non-discrimination (chapitre 2), certaines questions intéressant le licenciement, à savoir la durée du préavis, les mesures destinées à stimuler l’employabilité, la motivation, la notion de rémunération en cours en cas de réduction temporaire des prestations de travail, et l’indemnité d’éviction du représentant de commerce (chapitres 3 à 7), les distinctions entre employés et ouvriers autres que les conditions de licenciement (chapitre 8), la procédure de réorganisation judiciaire (chapitre 9) et la prescription (chapitre 10). [less ▲]

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See detailPrêt "coup de pouce": un nouvel incitant fiscal wallon pour le financement des entreprises débutantes
Bourgeois, Marc ULg; Pace, Xavier ULg

in Bourgeois, Marc (Ed.) Les incitants fiscaux pour les PME - actualités et aspects comptables (2016, April 28)

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See detailA Raster SOLAP for the Visualization of Crime Data Fields
Kasprzyk, Jean-Paul ULg; Donnay, Jean-Paul ULg

in Rückemann, Claus-Peter (Ed.) GEOProcessing 2016 (2016, April 19)

In order to effectively extract synthetic information from large spatial data sets, Spatial OnLine Analytical Processing (SOLAP) combines Geographic Information Systems (GIS) with Business Intelligence ... [more ▼]

In order to effectively extract synthetic information from large spatial data sets, Spatial OnLine Analytical Processing (SOLAP) combines Geographic Information Systems (GIS) with Business Intelligence (BI) to query data warehouses through interactive vector maps. On the other hand, crime strategical analysis is usually based on raster maps computed by Kernel Density Estimation (KDE), then independent of any artificial boundary. This paper introduces an alternative vision of SOLAP which uses the raster model (instead of the vector one) in order to integrate crime data fields computed by KDE. It allows a continuous visualization of spatial data which, until now, has not been compatible with other SOLAP tools. The original geo-model is validated by a prototype adapted to the police needs. [less ▲]

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See detailA Study Of Dry Stiction Phenomenon In MEMS Using A Computational Stochastic Multi-scale Methodology
Hoang Truong, Vinh ULg; Wu, Ling ULg; Paquay, Stéphane et al

in EuroSimE 2016 in Montpellier (2016, April 19)

This work studies the uncertainties of the adhesive contact problems for reduced size structures, e.g. the stiction failure of microelectromechanical systems (MEMS). In MEMS, because of the large surface ... [more ▼]

This work studies the uncertainties of the adhesive contact problems for reduced size structures, e.g. the stiction failure of microelectromechanical systems (MEMS). In MEMS, because of the large surface to volume ratio, the surfaces forces, such as van der Waals forces and capillary forces, are dominant in comparison with the body forces. As these force magnitudes strongly depend on the contact distance, when the two contacting surfaces are rough, the contact distances vary, and the physical contact areas are limited at the highest asperities of the contacting surfaces. Therefore, the adhesive contact forces between two rough surfaces can suffer from a scatter, and the involved structural behaviors can be indeterministic. To numerically predict the probability behaviors of structures involving adhesion in dry environments, in this paper, a computational stochastic model-based multi-scale method developed by the authors is applied. The effects of van der Waals is studied and compared with experimental data as well as with the effects of capillary forces. [less ▲]

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See detailObésité : outils et approches nutritionnelles pour obtenir un (minimum de) succès.
Diez, Marianne ULg

in Proceedings of the SCIVAC National Congress (2016, April 08)

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See detailA New Wavelet-Based Mode Decomposition for Oscillating Signals and Comparison with the Empirical Mode Decomposition
Deliège, Adrien ULg; Nicolay, Samuel ULg

in Information Technology: New Generations (2016, April)

We introduce a new method based on wavelets (EWMD) for decomposing a signal into quasi-periodic oscillating components with smooth time-varying amplitudes. This method is inspired by both the “classic” ... [more ▼]

We introduce a new method based on wavelets (EWMD) for decomposing a signal into quasi-periodic oscillating components with smooth time-varying amplitudes. This method is inspired by both the “classic” wavelet-based decomposition and the empirical mode decomposition (EMD). We compare the reconstruction skills and the period detection ability of the method with the well-established EMD on toys examples and the ENSO climate index. It appears that the EWMD accurately decomposes and reconstructs a given signal (with the same efficiency as the EMD), it is better at detecting prescribed periods and is less sensitive to noise. This work provides the first version of the EWMD. Even though there is still room for improvement, it turns out that preliminary results are highly promising. [less ▲]

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See detailIdentification of nonlinear frequency responses and bifurcations from experimental data
Noël, Jean-Philippe ULg; Gourc, Etienne ULg; Grappasonni, Chiara ULg et al

in Actes de CFA/VISHNO 2016 (2016, April)

The objective of the paper is to obtain the frequency response curves of nonlinear mechanical systems from broadband testing. The proposed approach consists in coupling an identification method with a ... [more ▼]

The objective of the paper is to obtain the frequency response curves of nonlinear mechanical systems from broadband testing. The proposed approach consists in coupling an identification method with a continuation method. Specifically, the frequency-domain nonlinear subspace identification (FNSI) method is first used to derive an experimental model of the structure in state-space from broadband measurements. The harmonic balance method coupled with arclength continuation then utilizes this experimental model to compute the frequency response curves of the system. The method is demonstrated using a numerical example. [less ▲]

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See detailImproved Thévenin equivalent methods for real-time voltage stability assessment
Perez, Angel; Johannsson, Hjortur; Ostergaard, Jacob et al

in proc. IEEE ENERGYCON Conference (2016, April)

An improved Thévenin equivalent method for real-time voltage stability assessment that uses wide-area information from synchrophasors is proposed. The improvements are a better modeling of the limited ... [more ▼]

An improved Thévenin equivalent method for real-time voltage stability assessment that uses wide-area information from synchrophasors is proposed. The improvements are a better modeling of the limited synchronous generators, and a processing that anticipates the effect of field current limiters, before the latter are activated. Several study cases using detailed dynamic simulations of the Nordic test system have been used to assess the performance of the proposed improvements. Their effectiveness is analyzed and, based on the results, their possible application in combination with the sensitivity-based voltage stability assessment method is explored. [less ▲]

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See detailThe Fractal Nature of Mars Topography Analyzed via the Wavelet Leaders Method
Kleyntssens, Thomas ULg; Deliège, Adrien ULg; Nicolay, Samuel ULg

in Information Technology: New Generations (2016, April)

This paper studies the scaling properties of Mars topography based on Mars Orbiter Laser Altimeter (MOLA) data through the wavelet leaders method (WLM). This approach shows a scale break at 15 km. At ... [more ▼]

This paper studies the scaling properties of Mars topography based on Mars Orbiter Laser Altimeter (MOLA) data through the wavelet leaders method (WLM). This approach shows a scale break at 15 km. At small scales, these topographic profiles display a monofractal behavior while a multifractal nature is observed at large scales. The scaling exponents are greater at small scales. They also seem to be influenced by latitude and may indicate a slight anisotropy in topography. [less ▲]

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See detailReview on the applications of directional impulse responses in room acoustics
Embrechts, Jean-Jacques ULg

in Actes du CFA 2016 (2016, April)

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See detailEnvironmental Impact Assessment of Rail Freight Intermodality
Merchan Arribas, Angel ULg; Belboom, Sandra ULg; Léonard, Angélique ULg

in Pombo, Joao (Ed.) The Third International Conference on Railway Technology: Research, Development and Maintenance (2016, April)

The European Commission’s White Paper on transport seeks to achieve an efficient and sustainable balance between the various transport modes. In this context, BRAIN-TRAINS is a project supported by ... [more ▼]

The European Commission’s White Paper on transport seeks to achieve an efficient and sustainable balance between the various transport modes. In this context, BRAIN-TRAINS is a project supported by Belgian Federal Government that deals with rail freight intermodality, approaching the problem from an interdisciplinary perspective. BRAIN-TRAINS will be able to answer the transition involved in transportation in Belgium. To analyse the sustainability impact of rail freight intermodality in Belgium, the life cycle assessment methodology will be used. The rail freight system is divided in this paper into rail operation, rail equipment and rail infrastructure. This paper shows the methodology to calculate the transport emissions related with the energy consumption during the rail operation. [less ▲]

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See detailAntibiotherapy in pet rodents and rabbits: a preliminary analysis of practitioners’ habits
Marlier, Didier ULg

in Proceedings of the European College of Zoological Medicine Symposium (2016, April)

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See detailTreeNET: Discovering and Connecting Subnets
Grailet, Jean-François ULg; Tarissan, Fabien; Donnet, Benoît ULg

in 8th International Workshop on Traffic Monitoring and Analysis (TMA) (2016, April)

Since the early 2000's, the Internet topology has been an attractive and important research topic, either for developing data collection mechanisms, and for analyzing and modeling the network. Beside ... [more ▼]

Since the early 2000's, the Internet topology has been an attractive and important research topic, either for developing data collection mechanisms, and for analyzing and modeling the network. Beside traditional aspects of the Internet topology (i.e., IP interface, router, and AS levels), recent researches focused on intermediate promising visions of the topology, namely Point-of-Presence (PoP) and subnets (i.e., a set of devices that are located on the same connection medium and that can communicate directly with each other at the link layer). This paper focuses on network subnet discovery by proposing a new tool called treenet. One of the key aspects of treenet is that it builds a tree representing the way subnets are located with respect to each other. This tree allows treenet to obtain additional information on the network, leading to better analysis of the collected data. In this paper, we demonstrate the potential of treenet through the evaluation of its key algorithmic steps and the study of measurements collected from the PlanetLab testbed. [less ▲]

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See detailWhen the same hydraulics conditions lead to different depositional patterns: case of an idealised delta
Peltier, Yann; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Geophysical Research Abstracts (2016, April)

Deltas are complex hydrosystems and ecosystems resulting from the interactions of a river system with a water body almost at rest. Anthropogenic factors (hydropower, flood management, development in the ... [more ▼]

Deltas are complex hydrosystems and ecosystems resulting from the interactions of a river system with a water body almost at rest. Anthropogenic factors (hydropower, flood management, development in the floodplains) lead to dramatic changes in sediment transport in the rivers and in sediment management practice. From continuous, the sediment transport becomes increasingly intermittent, with long periods of deficit in the sediment supply and short periods characterized by large supplies. Understanding how these intermittencies in the sediment supply affect the delta morphodynamics is of paramount importance for predicting the possible evolution and functioning of deltas. Deltas can reasonably be idealised as a reservoir, with an inlet channel representing the river and the sud- den enlargement of the reservoir representing the water body at rest. Using such an ideal configuration enables the assessment of the influence of individual geometric and hydraulic parameters on the depositional patterns responsible for the morphodynamic evolution of the delta. Recent literature has shown that for very similar hydraulic boundary conditions, two very different types of flow fields may develop (“straight jet” vs. “meandering jet”), leading to totally different depositional patterns. In turn, these distinct depositional patterns affect the flow itself through a two-way coupling between the hydrodynamics and the morphodynamics of the deposits. These complex processes will be discussed in the proposed presentation, based on the results of over 160 experimental tests and corresponding numerical simulations. [less ▲]

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See detailA Refined Method for Estimating the Global Hölder Exponent
Nicolay, Samuel ULg; Kreit, Damien

in Latifi, Shahram (Ed.) Information Technology: New Generations (2016, April)

In this paper, we recall basic results we have obtained about generalized Hölder spaces and present a wavelet characterization that holds under more general hypothesis than previously stated. This ... [more ▼]

In this paper, we recall basic results we have obtained about generalized Hölder spaces and present a wavelet characterization that holds under more general hypothesis than previously stated. This theoretical tool gives rise to a method for estimating the global Hölder exponent which seems to be more precise than other wavelet-based approaches. This work should prove helpful for estimating long range correlations. [less ▲]

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See detailCompact handheld low-cost biosensor platform for remote health monitoring
Hastanin, Juriy ULg; Lenaerts, Cedric ULg; Gailly, Patrick ULg et al

in Proceedings of SPIE; SPIE 2016 Photonics Europe (2016, April)

In this paper, we present an original concept of plasmonic-related instrumentation platform dedicated to diagnostic biosensing tests out of the laboratory. The developed instrumental platform includes ... [more ▼]

In this paper, we present an original concept of plasmonic-related instrumentation platform dedicated to diagnostic biosensing tests out of the laboratory. The developed instrumental platform includes both disposable one-use microfluidic affinity biochip and compact optical readout device for biochip monitoring involving mobile Internet devices for data processing and communication. The biochip includes both microfluidic and optical coupling structures formed into a single plastic slab. The microfluidic path of the biochip operates in passive capillary pumping mode. In the proof-of-concept prototype, we address specifically the sensing format involving Surface Plasmon Resonance phenomenon. The biochip is plugged in the readout device without the use of an index matching fluid. An essential advantage of the developed biochip is that its implementation involves conventional hot embossing and thin film deposition process, perfectly suited for mass production of low-cost microfluidic biochip for biochemical applications. [less ▲]

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See detailDesign optimization of large-size format edge-lit light guide units
Hastanin, Juriy ULg; Lenaerts, Cedric ULg; Fleury-Frenette, Karl ULg

in Proceedings of SPIE; SPIE 2016 Photonics Europe (2016, April)

In this paper, we present an original method of dot-pattern generation dedicated to design optimization of large-size format ELBUs (Edge-Lit Light Guide Unit), where the number of dots greatly exceeds the ... [more ▼]

In this paper, we present an original method of dot-pattern generation dedicated to design optimization of large-size format ELBUs (Edge-Lit Light Guide Unit), where the number of dots greatly exceeds the maximum allowable number of optical objects supported by most common ray-tracing software. In the proposed method, in order to simplify the computational problem, an original optical system is replaced by an equivalent one. Accordingly, the original dot pattern is splitted into multiple small sections. Then, these sections are replaced by equivalent cells with continuous diffusing film. After that, we adjust the TIS (Total Integrated Scatter) two-dimensional distribution over the grid of equivalent cells, using an iterative optimization procedure. Finally, the obtained optimal TIS distribution is converted into the dot size distribution by applying an appropriate conversion rule. An original semi-empirical equation dedicated to rectangular large-size LGPs (Light Guide Plate) is proposed for the initial guess of the TIS distribution. It allows significantly reducing the time needed to dot pattern optimization. [less ▲]

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See detailUnveiling the MPLS Structure on Internet Topology
Davila Revelo; Anderson Ricci, Mauricio; Donnet, Benoît ULg et al

in 8th International Workshop on Traffic Monitoring and Analysis (TMA) (2016, April)

Recently, researches have been conducted to discover and assess the usage of MPLS tunnels. Indeed, recent developments in the ICMP protocol make certain categories of MPLS tunnels transparent to ... [more ▼]

Recently, researches have been conducted to discover and assess the usage of MPLS tunnels. Indeed, recent developments in the ICMP protocol make certain categories of MPLS tunnels transparent to traceroute probing. Additional techniques have been proposed to reveal the presence of MPLS tunnels when they do not explicitly appear in traceroute. It has been shown that MPLS is a very well deployed technology whose usage (i.e., Traffic Engineering, load balancing, etc.) varies in time and according to ASes. However, the MPLS structure on the Internet architecture has not been studied yet. In this paper, we follow this path by providing two contributions to the state of the art: (i) we evaluate the biases involved on MPLS tunnel detection when they are not directly revealed through traceroute. (ii), we provide some properties and architectural details related with MPLS deployment on router topology based on a k-core decomposition. [less ▲]

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See detailThérapeutiques conservatrices des tendinopathies : quoi de neuf ?
Kaux, Jean-François ULg

in 11ème Congrès d'actualités diagnostiques, éthiques et thérapeutiques de l'arrondissement de Dinant (2016, March 19)

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See detailMOOCs in business administration - An overview of assessment practice
Gherib, Camelia; Dujardin, Jean-Marie ULg; Verpoorten, Dominique ULg

in Proceedings of the Conference of the European Association for Practitioner Research on Improving Learning (EAPRIL) 2015, Issue 2 (2016, March 07)

The study explores 31 MOOCs in the field of business administration, equipped with a conceptual framework documenting 18 facets of assessment design. As a second step, the data collected on 3 MOOCs about ... [more ▼]

The study explores 31 MOOCs in the field of business administration, equipped with a conceptual framework documenting 18 facets of assessment design. As a second step, the data collected on 3 MOOCs about assessment is submitted to university members in charge of external courses accreditation procedures in order to ascertain its possible influence on their decision to credit a MOOC or not. Main results indicate that, a) the typical profile of the assessment procedure for MOOCs in business administration is: QCM-based, automatic, continuous, individual, product-centred, standardized, b) secure ways (proctoring, test-centres) to warrant learners’ identity for the tests can already be found in some MOOCs of this field, and c) concerns of course accreditors bear first and foremost on these student authentication aspects. [less ▲]

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See detailParameter Correlation Analysis in Four Mathematical Models of Left Ventricular Relaxation
Pironet, Antoine ULg; MORIMONT, Philippe ULg; Dauby, Pierre ULg et al

in 14th Belgian Day on Biomedical Engineering (2016, March 04)

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See detailCardio-pulmonary mechanics and minimal modelling in critical care
de Bournonville, Sébastien; Pironet, Antoine ULg; Desaive, Thomas ULg et al

in 14th Belgian Day on Biomedical Engineering (2016, March 04)

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See detailDouble genetic defect in a case of congenital hypogonadotropic hypogonadism
Potorac, Iulia ULg; Pintiaux, Axelle ULg; VALDES SOCIN, Hernan Gonzalo ULg et al

in Abstract book - 17th World Congress of Gynecological Endocrinology (2016, March)

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See detailEstetrols’ Potential for Neuroprotection Following the injury to the Developing Brain: Preclinical Studies
Tskitishvili, Ekaterine ULg; Nisolle, Michelle ULg; Noël, Agnès ULg et al

in The 17th World Congress of Gynecological Endocrinology, Florence 2-5 March 2016 (2016, March)

Context: Hypoxic-Ischemic encephalopathy (HIE) remains a major cause of perinatal brain injury. The brain rapidly increases in size, shape and complexity during the second and third trimesters. A sentinel ... [more ▼]

Context: Hypoxic-Ischemic encephalopathy (HIE) remains a major cause of perinatal brain injury. The brain rapidly increases in size, shape and complexity during the second and third trimesters. A sentinel event in late pregnancy or the intrapartum period may have an acute profound effect on a previously neurologically intact fetus, leading to the development of (HIE). The nature of the deficits is dependent on the gestational age and severity of the insult, though it is seldom reported in preterm infants. Studies in animal models of HIE may provide important information for the development of treatment for this pathological condition. Estetrol (E4) is a recently described estrogen with four hydroxyl-groups that is synthesized exclusively during pregnancy by the human fetal liver. Objective: In this study, we evaluated E4’s neuroprotective and therapeutic potency in neonatal (in vivo) HIE model of the immature 7-day-old newborn rat. Methods: Rat pups body temperatures were examined along with their body and brain weights. Brains were studied at the level of the hippocampus and cortex. Intact cell counting and expressions of markers for neuronal early grey matter damage (microtubule-associated protein-2 (MAP-2)), neurogenesis (doublecortin (DCX)) and angiogenesis (vascular-endothelial growth factor (VEGF)) were evaluated by histo- and immunohistochemistry. The serum levels of two markers of brain damage (S100B and glial fibrillary acidic protein (GFAP)) were measured by ELISA. Results: Our results demonstrate that E4 has a significant neuroprotective and therapeutic effects. Estetrol decreases the early gray matter loss, and promotes neuro- and angiogenesis in vivo. Estetrol treatment has no effects on body weight, brain weight or body temperature. Conclusion: Taken together, E4 might become an important safe and physiological substance to treat neonatal HIE. [less ▲]

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See detailNovel composite heterozygous mutation of the receptor for hCG and LH leading to male disorder of sexual development
Potorac, Iulia ULg; FUDVOYE, Julie ULg; GAILLEZ, Stephanie ULg et al

in Abstract book - 17th World Congress of Gynecological Endocrinology (2016, March)

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See detailSPÉCIALISATION SPORTIVE PRÉCOCE : QUEL IMPACT SUR LA PERFORMANCE, SUR LE DÉVELOPPEMENT ET SUR LA SANTÉ ET QUELLES PISTES DE SOLUTION ?
Jidovtseff, Boris ULg

in Jidovtseff; Halleux, Philippe; Lambert, Eric (Eds.) Livre des résumés du 2ème colloque Guuy Namurois (de l'éducation physique à la performance sportive) (2016, February 27)

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See detailEDUCATION RACHIDIENNE : DE L’ENFANT AU SPORTIF DE HAUT NIVEAU
Vanderthommen, Marc ULg; GROSDENT, Stéphanie ULg; Fettweis, Tatiana ULg et al

in Livre des Résumés du 2ème Colloque Guy Namurois (2016, February 27)

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See detail2. Implantation des cultures
Eylenbosch, Damien ULg; Meza Morales, Walter ULg; Monfort, Bruno et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail4. La fumure azotée
Meza Morales, Walter ULg; Monfort, Bruno; Dumont, Benjamin ULg et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail10.1. L'intérêt de la culture en association de froment et de pois protéagineux d'hiver dans un objectif d'autonomie protéique
Pierreux, Jérome ULg; Delaplace, Pierre ULg; Roisin, Christian et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail6. Lutte intégrée contre les maladies
Bataille, Charlotte; Duvivier, Maxime; Heens, Benoît et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail10.2. Evaluation des cultures dérobées implantées en tant que surfaces d'intérêt écologique (SIE) dans le cadre de la PAC 2015-2020
Hancart, F.; Jenet, D.; Lambert, B. et al

in Watillon, B.; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detail5. Régulateurs de croissance
Henriet, François; Monfort, Bruno; Meza Morales, Walter ULg

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2016, February 24)

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See detailThe materials lifecycle : A steering wheel for Europe's Raw Materials Academy.
Pirard, Eric ULg; Greberg, Jenny

in TMS 2016 Supplemental Proceedings (2016, February)

EIT Raw Materials is a major European initiative supported by more than 120 core and associate partners from industry, research and academia. Among the core missions of this network is the establishment ... [more ▼]

EIT Raw Materials is a major European initiative supported by more than 120 core and associate partners from industry, research and academia. Among the core missions of this network is the establishment of a Raw Materials RM Academy to educate T-shaped professionals that will contribute to the development of a sustainable and resource efficient Europe. Every T-shaped professional should combine an in depth knowledge of his own discipline with a sound understanding of the challenges of the full raw materials value chain and with a mindset for innovation and entrepreneurship. The main objective of the RM Academy is to connect all T-shaped professionals to help create the circular economy steering wheel. Therefore, the RM Academy has the following missions: - Label and support educational programs. - Promote a permanent offer of cross-disciplinary programmes, workshops and courses. - Train T-shaped professionals into T-shaped entrepreneurs. - Promote lifelong learning initiatives. - Stimulate wider society learning initiatives aiming at raising social and political awareness. - Closely collaborate with industry - Enable a high degree of mobility of students and professionals [less ▲]

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See detailPredicting Review Helpfulness
Ittoo, Ashwin ULg

in Proceedings (2016, February)

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See detailContextualisation de la pensée d'Albert Demaret et réflexion autour du déni anorexique
Mormont, Christian ULg

in Englebert, Jérôme; Follet, Valérie (Eds.) Adaptation. Essai collectif à partir des paradigmes éthologiques et évolutionnistes. (2016, February)

Contextualization of thoughts and works of Albert Demaret in the field of psychiatry and ethology. About the disavowal in anorectic female.

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See detailDecision Making from Confidence Measurement on the Reward Growth using Supervised Learning: A Study Intended for Large-Scale Video Games
Taralla, David ULg; Qiu, Zixiao ULg; Sutera, Antonio ULg et al

in Proceedings of the 8th International Conference on Agents and Artificial Intelligence (ICAART 2016) - Volume 2 (2016, February)

Video games have become more and more complex over the past decades. Today, players wander in visually and option- rich environments, and each choice they make, at any given time, can have a combinatorial ... [more ▼]

Video games have become more and more complex over the past decades. Today, players wander in visually and option- rich environments, and each choice they make, at any given time, can have a combinatorial number of consequences. However, modern artificial intelligence is still usually hard-coded, and as the game environments become increasingly complex, this hard-coding becomes exponentially difficult. Recent research works started to let video game autonomous agents learn instead of being taught, which makes them more intelligent. This contribution falls under this very perspective, as it aims to develop a framework for the generic design of autonomous agents for large-scale video games. We consider a class of games for which expert knowledge is available to define a state quality function that gives how close an agent is from its objective. The decision making policy is based on a confidence measurement on the growth of the state quality function, computed by a supervised learning classification model. Additionally, no stratagems aiming to reduce the action space are used. As a proof of concept, we tested this simple approach on the collectible card game Hearthstone and obtained encouraging results. [less ▲]

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See detailFramework for Threat Based Failure Rates in Transmission System Operation
Perkin, Samuel; Bjornsson, Gudjon; Baldursdottir, Iris et al

in Framework for Threat Based Failure Rates in Transmission System Operation (2016, February)

Reliability of electrical transmission systems isvpresently managed by applying the deterministic N-1 criterion, or some variant thereof. This means that transmission systems are designed with at least ... [more ▼]

Reliability of electrical transmission systems isvpresently managed by applying the deterministic N-1 criterion, or some variant thereof. This means that transmission systems are designed with at least one level of redundancy, regardless of the cost of doing so, or the severity of the risks they mitigate. In an operational context, the N-1 criterion provides a reliability target but it fails to accurately capture the dynamic nature of short-term threats to transmission systems. Ongoing research aims to overcome this shortcoming by proposing new probabilistic reliability criteria. Such new criteria are anticipated to rely heavily on component failure rate calculations. This paper provides a threat modelling framework, using the Icelandic transmission system as an example, highlighting the need for improved data collection and failure rate modelling. The feasibility of using threat credibility indicators to achieve spatio-temporal failure rates, given minimal data, is explored in a case study of the Icelandic transmission system. The paper closes with a discussion on the assumptions and simplifications that are implicitly made in the formulation, and the additional work required for such an approach to be included in existing practices. Specifically, this paper is concerned only with short term and real-time management of electrical transmission systems. [less ▲]

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See detailCharacterization of GPR101 transcripts structure, expression and signaling
Trivellin, G; Bjelobaba, I; Daly, Adrian ULg et al

in Abstract book - Keystone Symposia on GPCRs (2016, February)

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See detailCommuniquer pour mieux gérer les ressources naturelles, cas pilote du bassin versant de la rivière Lukaya.
Jacmain, Céline; Rosillon, Francis ULg

in Elongo, V.L.; Wildi, Walter; Onaotsho, K. (Eds.) et al Actes du séminaire interdisciplinaire et interuniversitaire : Communication environnementale dans les pays en développement : enjeux, modèles, applications. (2016, February)

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See detailPrise en charge des patients en état de conscience altérée. Approche kinésithérapique par stimulations transcrâniennes non invasives et attèles souples
Martens, Géraldine ULg

in Kinésithérapie, la revue. Vol 16 - n°170 (2016, February)

Ces dernières années, grâce au perfectionnement des techniques de réanimation, le nombre de patients survivant à leur lésion cérébrale a fortement augmenté. Tandis que certains se rétablissent rapidement ... [more ▼]

Ces dernières années, grâce au perfectionnement des techniques de réanimation, le nombre de patients survivant à leur lésion cérébrale a fortement augmenté. Tandis que certains se rétablissent rapidement, d’autres traversent différents états de conscience altérée (coma, état végétatif/non répondant ou état de conscience minimale) avant de récupérer ou non un état de conscience normal. Les patients en état de conscience altérée représentent un problème majeur tant au niveau diagnostique, pronostique, thérapeutique, qu’au niveau de leur prise en charge quotidienne. Diverses possibilités de traitements pharmacologiques et non pharmacologiques ont été étudiées. Les techniques des stimulations transcrâniennes à courant continu (tDCS) augmentent l’excitabilité corticale et le flux sanguin cérébral régional. La plasticité cérébrale s’en voit améliorée, ce qui module l’activité corticale et donc l’activité fonctionnelle des aires se trouvant sous l’anode. Une plasticité cérébrale est parfois encore possible, même au stade chronique. Un des problèmes majeurs de ces patients est la spasticité qui cause diverses complications (rétractions musculaires, subluxations et luxations articulaires, escarres, positions vicieuses) en plus du facteur algique. Ces complications sont d’autant plus importantes que ces patients sont voués à rester alités. La kinésithérapie permet de réduire les complications liées à la spasticité mais est parfois insuffisante et la prise d’antispastiques est inévitable. La technique la plus couramment utilisée est l’étirement passif : son efficacité dans la réduction des phénomènes spastiques est clairement reconnue. Par ailleurs, des études ont montré l’intérêt de la mise en place d’une attèle souple au niveau du membre supérieur chez les patients spastiques. L’avantage de cette technique est sa simplicité d’utilisation. Cette attelle se base sur le principe de saturation du système proprioceptif cutané à l’aide d’un tissu élastique, ceci simultanément à un rééquilibrage des antagonistes. De nombreuses pistes restent encore à explorer pour une prise en charge optimale des patients cérébrolésés. [less ▲]

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See detailHow heterogeneity of the K-field influences a heat plume in a shallow alluvial aquifer: responses from a heat tracer test
Klepikova, Maria; Jamin, Pierre ULg; Orban, Philippe ULg et al

in Abstract book (2016, January 26)

Simultaneous solute and heat tracer test provides essential information for a reliable assessment of low temperature geothermal systems. The actual efficiency of ‘open systems’, including heat storage ... [more ▼]

Simultaneous solute and heat tracer test provides essential information for a reliable assessment of low temperature geothermal systems. The actual efficiency of ‘open systems’, including heat storage projects, is strongly affected by the heterogeneity of the hydraulic conductivity field (K-field). It could be also useful for assessing the cumulative impacts of numerous projects in urban areas on the groundwater resources. Using field data from a solute and heat tracer test conducted in the alluvial aquifer of the Meuse River (Belgium), an inverse problem of parameter estimation is solved. The tracing experiment consisted in simultaneously injecting heated water and a dye tracer in a piezometer and monitoring the evolution of groundwater temperature and tracer concentration in the recovery well and in monitoring wells. To get insights in the 3D characteristics of the heat plume, an arrangement of three transects of observation wells was used. The breakthrough curves measured in the recovery well showed that heat transfer in the alluvial aquifer is slower and more dispersive than solute transport. Recovery is very low for heat while in the same time it is measured as relatively high for the solute tracer. This is due to the fact that heat transport is a thermal diffusion dominated process. For conditions corresponding to high Peclet numbers, the hydraulic conductivity is the primary calibration parameter for predicting heat plume distribution. Heat diffusion is larger than molecular diffusion, implying that exchange between groundwater and the porous medium matrix is far more significant for heat than for solute tracers. [less ▲]

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See detailHydrogeological conditions required for Underground Pumping Storage Hydroelectricity (UPSH) in old mines
Bodeux, Sarah ULg; Pujades, Estanislao ULg; Orban, Philippe ULg et al

in Abstract book (2016, January 26)

Renewable energy sources, because of their intermittence, could not afford a stable production and an adequate variability according to the energy demand. Underground Pumped Storage Hydroelectricity (UPSH ... [more ▼]

Renewable energy sources, because of their intermittence, could not afford a stable production and an adequate variability according to the energy demand. Underground Pumped Storage Hydroelectricity (UPSH) using abandoned mine works is an interesting alternative, in flat regions, to store energy during low demand periods by pumping water from an underground mine to an upper reservoir. From the hydrogeological point of view, two considerations can arise for studying the feasibility before constructing an UPSH plant: 1) the alteration of the natural conditions of surrounding aquifers, and (2) the efficiency of the plant depending on possible leakage in the cavities from the hydrogeological environment. A potential old slate mine was selected through a multi-criterion method and its geometrical and hydrogeological characteristics are used to build a simple but typical model. With the help of the HFEMC approach implemented in the code SUFT3D (HEG-ULg), the groundwater flows are modelled for a representative cavity. Simulations of groundwater flow induced by a UPSH system are performed and the main variables are identified. Piezometric heads around the reservoir oscillate, the magnitude of the oscillations and the time to achieve a pseudo-steady state (magnitude and head reached during oscillations not varying anymore with time) depend on the boundaries, the parameters of the aquifer and the characteristics of the underground reservoir. The required hydrogeological conditions are deduced and a screening methodology can be proposed to assess the main impacts caused in aquifers by UPSH plants. Their efficiency regarding the water level evolution inside the reservoir is also considered accommodating the cyclic pumped storage schemes. [less ▲]

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See detailTennis elbow - Actualités
Kaux, Jean-François ULg

in La Médecine et le Sport : mise au point (2016, January 23)

L’épicondylite latérale est plus communément appelée tennis elbow suite à sa fréquence élevée d’apparition chez les joueurs de tennis – lors du mouvement de revers, principalement. Cette pathologie du ... [more ▼]

L’épicondylite latérale est plus communément appelée tennis elbow suite à sa fréquence élevée d’apparition chez les joueurs de tennis – lors du mouvement de revers, principalement. Cette pathologie du membre supérieur, fréquente chez les sportifs, touche particulièrement la région épicondylienne radiale, zone d’insertion commune des muscles extenseurs. L’épicondylite latérale est 7 à 20 fois plus répandue que l’épicondylite médiale souvent nommée golfer’s elbow. L’âge est un facteur de risque important, la prévalence est la plus élevée chez les individus âgés entre 35 et 55 ans. Un autre élément prédisposant est la répétition d’un mouvement pendant plus de 2 à 4 heures par jour. Certains sports ont une plus grande incidence sur l’épicondylite que d’autres. Le tennis, le windsurf, l’escalade, le lancer du javelot ou les sports en chaises roulantes sont des activités à haut risque concernant les tendinopathies du coude. Le milieu professionnel joue aussi son rôle délétère envers les muscles épicondyliens. Le travail à la chaine sur des machines, obligeant des mouvements de flexion-extension répétés du coude, de la main et des doigts, peut rapidement être responsable d’épicondylites. De même, la position de travail, le matériel inadapté, le port d’outils trop lourds, le cumul de gestes à risque et, globalement, la mauvaise ergonomie du poste de travail constituent des facteurs déclenchant des tendinopathies du coude. Les épicondylites peuvent être aussi provoquées par des gestes quotidiens : le ménage, le bricolage, la traction de « caddy » au supermarché, l’excès d’activité sur ordinateur par exemple. Malgré une importante diversité des traitements conservateurs – repos, glace, orthèse, anti-inflammatoire non-stéroïdien en phase aigüe, ultrasons, stimulation électrique, massage transverse profond, étirement et onde de chocs –, les symptômes persistent ou des rechutes après un retour à l’activité incriminée sont souvent observées. De nouvelles thérapeutiques, par injection de plasma riche en plaquettes ou acide hyaluronique par exemple, sont également développées pour traiter les tendinopathies rebelles. Au final, si le traitement conservateur n’est plus efficace, la chirurgie sera envisagée. [less ▲]

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See detailDoes Fomalhaut A Have an Asteroid-belt Analog?
Su, Kate Y. L.; Rieke, George; Defrere, Denis ULg et al

in American Astronomical Society Meeting Abstracts (2016, January 01)

Fomalhaut plays an important role in the study of debris disks and small bodies in other planetary systems. The proximity and luminosity of the star make key features of its debris like the water ice-line ... [more ▼]

Fomalhaut plays an important role in the study of debris disks and small bodies in other planetary systems. The proximity and luminosity of the star make key features of its debris like the water ice-line easily accessible. Here we present ALMA cycle 1, 870 μm (345 GHz) observation targeted at the inner part of the Fomalhaut system with a synthesized beam of 0.45"x0.37" (~3 AU linear resolution at the distance of Fomalhaut) and a rms of 26 μJy per beam. The high angular resolution and sensitivity of the ALMA data enable us to place strong constraints on the nature of the warm excess revealed by Spitzer and Herschel observations. We detect a point source at the star position with a total flux consistent with thermal emission from the stellar photosphere. No structures that are brighter than 3 σ are detected in the central 15 AUx15 AU region. Modeling the spectral energy distribution using parameters expected for a dust-producing planetesimal belt indicates a radial location in the range ˜8-15 AU. This is consistent with the location where ice sublimates in Fomalhaut, i.e., an asteroid-belt analog. We also provide a new interpretation for the emission structure in the inner 10 AU region revealed by interferometric measurements at 2 and 8-13 μm as dust naturally connected to this proposed asteroid belt by Poynting-Robertson drag, dust sublimation, and magnetically trapped nano grains. [less ▲]

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See detailAn Accreting Protoplanet: Confirmation and Characterization of LkCa15b
Follette, Katherine B.; Miller Close, Laird; Males, Jared et al

in American Astronomical Society Meeting Abstracts (2016, January 01)

We present a visible light adaptive optics direct imaging detection of a faint point source separated by just 93 milliarcseconds (~15 AU) from the young star LkCa 15. Using Magellan AO's visible light ... [more ▼]

We present a visible light adaptive optics direct imaging detection of a faint point source separated by just 93 milliarcseconds (~15 AU) from the young star LkCa 15. Using Magellan AO's visible light camera in Simultaneous Differential Imaging (SDI) mode, we imaged the star at Hydrogen alpha and in the neighboring continuum as part of the Giant Accreting Protoplanet Survey (GAPplanetS) in November 2015. The continuum images provide a sensitive and simultaneous probe of PSF residuals and instrumental artifacts, allowing us to isolate H-alpha accretion luminosity from the LkCa 15b protoplanet, which lies well inside of the LkCa15 transition disk gap. This detection, combined with a nearly simultaneous near-infrared detection with the Large Binocular Telescope, provides an unprecedented glimpse at a planetary system during epoch of planet formation. [less ▲]

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See detailUne forme compliquée d'hypercalcémie hypocalciurique familiale
Potorac, Iulia ULg; BETEA, Daniela ULg; MALAISE, Olivier ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" (2016, January)

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See detailA Comparison of Reduced Order Modeling Techniques Used in Dynamic Substructuring
Roettgen, Daniel; Seeger, Benjamin; Tai, Wei Che et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIV (2016, January)

Experimental dynamic substructuring is a means whereby a mathematical model for a substructure can be obtained experimentally and then coupled to a model for the rest of the assembly to predict the ... [more ▼]

Experimental dynamic substructuring is a means whereby a mathematical model for a substructure can be obtained experimentally and then coupled to a model for the rest of the assembly to predict the response. Recently, various methods have been proposed that use a transmission simulator to overcome sensitivity to measurement errors and to exercise the interface between the substructures; including the Craig-Bampton, Dual Craig-Bampton, and Craig-Mayes methods. This work compares the advantages and disadvantages of these reduced order modeling strategies for two dynamic substructuring problems. The methods are first used on an analytical beam model to validate the methodologies. Then they are used to obtain an experimental model for structure consisting of a cylinder with several components inside connected to the outside case by foam with uncertain properties. This represents an exceedingly difficult structure to model and so experimental substructuring could be an attractive way to obtain a model of the system. [less ▲]

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See detailHysteresis identification using nonlinear state-space models
Noël, Jean-Philippe ULg; Esfahani, Alireza; Kerschen, Gaëtan ULg et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIV (2016, January)

Most studies tackling hysteresis identification in the technical literature follow white-box approaches, i.e. they rely on the assumption that measured data obey a specific hysteretic model. Such an ... [more ▼]

Most studies tackling hysteresis identification in the technical literature follow white-box approaches, i.e. they rely on the assumption that measured data obey a specific hysteretic model. Such an assumption may be a hard requirement to handle in real applications, since hysteresis is a highly individualistic nonlinear behaviour. The present paper adopts a black-box approach based on nonlinear state-space models to identify hysteresis dynamics. This approach is shown to provide a general framework to hysteresis identification, featuring flexibility and parsimony of representation. Nonlinear model terms are constructed as a multivariate polynomial in the state variables, and parameter estimation is performed by minimising weighted least-squares cost functions. Technical issues, including the selection of the model order and the polynomial degree, are discussed, and model validation is achieved in both broadband and sine conditions. The study is carried out numerically by exploiting synthetic data generated via the Bouc-Wen equations. [less ▲]

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See detailThe genetic causes of pituitary gigantism
Rostomyan, Liliya ULg; Lysy, P; Desfilles, C et al

in Abstract book - Symposium "Perspectives in Endocrinology" (2016, January)

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See detailExperimental nonlinear identification of an aircraft with bolted connections
De Filippis, Giovanni; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg et al

in Proceedings of the International Modal Analysis Conference (IMAC) XXXIII (2016, January)

Aircraft structures are known to be prone to nonlinear phenomena, especially as they constantly become lighter and hence more flexible. One specific challenge that is regularly encountered is the modeling ... [more ▼]

Aircraft structures are known to be prone to nonlinear phenomena, especially as they constantly become lighter and hence more flexible. One specific challenge that is regularly encountered is the modeling of the mounting interfaces between aircraft subcomponents. Indeed, for large amplitudes of vibration, such interfaces may loosen and, in turn, trigger complex mechanisms such as friction and clearances. In this context, the present work intends to investigate the nonlinear dynamics of the Morane–Saulnier Paris aircraft, accessible at ONERA. This aircraft possesses multiple bolted connections between two external fuel tanks and wing tips. The objective of the paper is specifically to carry out an adequate identification of the numerous nonlinearities affecting the dynamics of this full-scale structure. Nonlinearity detection and the subsequent subspace-based parameter estimation have been performed on experimental data, collected during an on-ground test campaign. Nonlinearity detection is first achieved by the comparison of frequency response functions estimated at low excitation level, with those obtained at high amplitude level, yielding insight towards accurately characterizing the behavior of the bolted connections. Then, a nonlinear subspace identification method is applied to measured data to estimate the linear and nonlinear parameters of the structure and novel strategies and tools that overcome specific arisen problems are developed. [less ▲]

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See detailLe cabinet de papier de Jean Jacques Boissard (1528-1602). Réception de l’Antiquité et collectionnisme
De Marco, Rosa ULg

in Bourdieu, Catherine (Ed.) Collections et collectionneurs dans les Trois-Évêchés (2016, January)

Detailed reference viewed: 26 (1 ULg)