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See detailReduced Order Model for Accounting for High Frequency Effects in Power Electronic Components
Paquay, Yannick ULg; Geuzaine, Christophe ULg; Hasan, Md. Rokibul et al

Poster (2015, June)

This paper proposes a reduced-order model of power electronic components based on the proper orthogonal decomposition. Starting from a full-wave finite-element model and several snapshots/frequencies, the ... [more ▼]

This paper proposes a reduced-order model of power electronic components based on the proper orthogonal decomposition. Starting from a full-wave finite-element model and several snapshots/frequencies, the reduced-order (RO) model is constructed. Local field values (e.g. magnetic flux density, electric current density, magnetic or electric field) and global quantities (e.g. characteristic complex impedance, joule losses) can be determined for the intermediate frequencies with a very low computational cost and high accuracy. Particular attention is paid to the choice of the most suitable snapshots by means of three different greedy algorithms, the performance of which is compared. We adopt an automatic greedy algorithm that depends only on the RO model. [less ▲]

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See detailNonlinear Interpolation on Manifold of Reduced Order Models in Magnetodynamic Problems
Paquay, Yannick ULg; Bruls, Olivier ULg; Geuzaine, Christophe ULg

Poster (2015, June)

Proper Orthogonal Decomposition (POD) is an efficient model order reduction technique for linear problems in computational sciences, recently gaining popularity in electromagnetics. However, its ... [more ▼]

Proper Orthogonal Decomposition (POD) is an efficient model order reduction technique for linear problems in computational sciences, recently gaining popularity in electromagnetics. However, its efficiency has been shown to considerably degrade for nonlinear problems. In this paper, we propose a reduced order model for nonlinear magnetodynamic problems by combining POD with an interpolation on manifolds, which interpolates the reduced bases to efficiently construct the desired solution. [less ▲]

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See detailAtmospheric pressure mode localization coupled resonators stiffness sensor
Montaseri, Mohammad; Xie, J.B.; Chang, Homglong et al

in Proceedings of Solid-State Sensors, Actuators and Microsystems (Transducers 2015) (2015, June)

This paper reports on a 3-DoF mode localization resonant sensor experimentally evaluated under atmospheric conditions. It was demonstrated that using amplitude ratio as an output signal, even when the ... [more ▼]

This paper reports on a 3-DoF mode localization resonant sensor experimentally evaluated under atmospheric conditions. It was demonstrated that using amplitude ratio as an output signal, even when the device is operated in air, yields a higher sensitivity compared to the frequency variation sensitivity when assuming vacuum conditions. [less ▲]

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See detailA novel resonant accelerometer based on model localization of weakly coupled resonators.
Zhang, Hemin; Yuan, W.Z.; Li, B.Y. et al

in Proceedings of Solid-State Sensors, Actuators and Microsystems (Transducers 2015) (2015, June)

This paper describes a novel MEMS resonant accelerometer based on two weakly coupled resonators (WCRs) using the phenomenon of mode localization. It is the first time that this principle is demonstrated ... [more ▼]

This paper describes a novel MEMS resonant accelerometer based on two weakly coupled resonators (WCRs) using the phenomenon of mode localization. It is the first time that this principle is demonstrated experimentally for an accelerometer. The measured relative shift in amplitude ratio (~312162 ppm/g) is 302 times higher than the shift in resonance frequency (~1035 ppm/g). [less ▲]

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See detailFrom FIPA to gigantism
Beckers, Albert ULg

Scientific conference (2015, June)

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See detailQualité de vie de résidents souffrant de pathologies démentielles issus de 32 MR/MRS de l’asbl FIH
Missotten, Pierre ULg; Schroyen, Sarah ULg; Adam, Stéphane ULg

Report (2015)

Effectuée au niveau de 32 institutions, l’enquête FIH-ULg a permis de récolter des informations par rapport à 1020 résidents et 1412 professionnels. En vue d’évaluer au mieux le niveau de qualité de vie ... [more ▼]

Effectuée au niveau de 32 institutions, l’enquête FIH-ULg a permis de récolter des informations par rapport à 1020 résidents et 1412 professionnels. En vue d’évaluer au mieux le niveau de qualité de vie des résidents (et des facteurs l’influençant), nous avions pris le parti de prendre en considération, dans la mesure du possible, l’avis d’au moins deux professionnels pour un même résident. Ceci nous a permis d’analyser les données à deux niveaux : (1) en privilégiant un score moyen de qualité de vie pour chaque résident (score tenant compte de l’avis des deux ou trois professionnels ayant évalué le niveau de qualité de vie d’un même résident) et (2) en regardant la différence de perception de qualité de vie pouvant exister entre les différents professionnels évaluant un même résident. En vue de mieux comprendre ce qui fait que la qualité de vie n’est pas similaire pour tous les résidents, nous avons mis en lien le niveau de qualité de vie des résidents avec toute une série de facteurs susceptibles de l’influencer, à savoir des facteurs liés (1) au résident lui-même (âge, sexe, diagnostic, niveau de dépendance, etc.), (2) à son contexte de vie (MR ou MRS, unité spécifique ou non, chambre individuelle ou collective, etc.), (3) aux professionnels évaluant la qualité de vie des résidents (âge, sexe, profession, etc., mais aussi vision du vieillissement et des pathologies démentielles) et (4) à la relation existant entre ces professionnels et les résidents (nature, fréquence et qualité des contacts). [less ▲]

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See detailMeasurement of 3D Room Impulse Responses with a Spherical Microphone Array
Embrechts, Jean-Jacques ULg

in Proceedings of the Euronoise 2015 Congress (2015, June)

Directional room impulse responses (DRIRs) are composed of the sound contributions reaching a given location in the room from a well-defined direction in space. DRIRs can be useful in many applications ... [more ▼]

Directional room impulse responses (DRIRs) are composed of the sound contributions reaching a given location in the room from a well-defined direction in space. DRIRs can be useful in many applications, such as the evaluation of spatial room acoustics parameters, the detection of unwanted specular reflections or the 3D auralization of acoustic spaces. A spherical array containing 16 microphones has been realized to measure DRIRs. The logarithmic sinesweep technique is first applied to measure 16 impulse responses, one for each microphone. A spherical harmonics (SH) decomposition of the sound field is then obtained. Spatial aliasing, placement errors and the ‘white noise gain’ (WNG) have been analysed to define the useful bandwith of this measure, i.e. [250Hz – 4kHz]. The coefficients of the SH decomposition are then processed by some beamforming methods, in order to compute the DRIR in any direction around the spherical array. Time and 3D space representations can be generated. The results obtained in some rooms are illustrated in this paper: it is shown that the combination of the ‘delay-and-sum’ and ‘minimum-variance distorsionless response’ beamforming methods is particularly well suited for the analysis of DRIRs. [less ▲]

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See detailDescription of the research project CIMEDE for the industrial construction of evolutionary, sustainable and economic houses
Duthoit, Fabienne ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the Euronoise 2015 Congress (2015, June)

CIMEDE is a research project supported by the Region of Wallonia (Belgium). It stands for CIMEDE “Construction Industrielle de Maisons Evolutives, Durables et Economiques – industrial construction of ... [more ▼]

CIMEDE is a research project supported by the Region of Wallonia (Belgium). It stands for CIMEDE “Construction Industrielle de Maisons Evolutives, Durables et Economiques – industrial construction of evolutionary, sustainable and economic houses”. Since the materials envisaged for this project are timber and gypsum fibre board, it was necessary to design a constructive principle of lightweight timber frame constructions which meets the industrial, sustainable, evolutionary and economic requirements and also the requirements of the Belgian acoustic standard NBN S01-400-1. First of all, an inventory of constructive elements that are currently used in this type of construction (floors, walls and facades) is presented with their acoustic performances. Then, the laboratory measurements of some samples of floors, facades, interior walls and partition walls are described and discussed. On the basis of the measurement results, several solutions that best meet all criteria were retained and a mock-up was built with these constructive elements. Measurement results on this mock-up are also presented. The final solution for the floor, the partition wall, the interior wall and the facade which meets the acoustic requirements is finally described [less ▲]

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See detailGroupes délinquants juvéniles, quelle méthode pour une recherche « ethno-criminologique » ? La loi des 4 C
Witvrouw, Line ULg; Glowacz, Fabienne ULg

in Revue Internationale de Criminologie et de Police Technique et Scientifique [= RICPTS] (2015), LXVIII(Avril-Juin), 196-209

La criminologie nous amène à travailler avec des populations difficiles d’accès et requiert une démarche méthodologique structurée et prenant en compte les caractéristiques du milieu de rencontre. A ... [more ▼]

La criminologie nous amène à travailler avec des populations difficiles d’accès et requiert une démarche méthodologique structurée et prenant en compte les caractéristiques du milieu de rencontre. A partir de notre recherche portant sur les groupes de jeunes délinquants ou déviants, une spécificité est apparue dès le début des démarches empiriques. En effet, une notion d’exclusivité est entendue entre chaque membre du groupe, rendant l’accès à l’information difficile tant les frontières de ce groupe vis-à-vis de l’extérieur sont imperméables. Le chercheur se trouve alors confronté à différents obstacles: la difficulté de prise de contacts avec les groupes, la difficulté d’intégration du chercheur au sein de ceux-ci et la difficulté de récolte de données suffisantes pour la recherche. Au vu des constats de terrain, nous avons développé une méthodologie spécifique inspirée de modèles ethnologiques. En prenant en compte les jeunes en tant qu’experts de leur vécu et les intervenants médiateurs d’inclusion sur un terrain, ce processus méthodologique relève d’une co-construction de trois pôles et partenaires et s’apparente à une approche ethno-criminologique. Ce processus par étapes se décline en séquences temporelles successives. Tout d’abord, le positionnement du chercheur comme non-détenteur du savoir, la triangulation de la relation, l’acceptation de la temporalité de la démarche et de l’instrumentalisation de la relation sont autant d’éléments constituant l’étape préalable de ce processus méthodologique. Les étapes suivantes se construisent sur la base de l’évolution du lien entre le chercheur et les jeunes. La loi des 4 C réunit ces étapes, la relation évoluant de la confiance, à la confidence, ensuite à la communication pour aboutir à la coopération [less ▲]

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See detailMacroscopic analysis of interaction models for the provision of flexibility in distribution systems
Mathieu, Sébastien ULg; Ernst, Damien ULg; Cornélusse, Bertrand ULg

in Proceedings of the International Conference on Electricity Distribution, CIRED 2015 (2015, June)

To ease the transition towards the future of distribution grid management, regulators must revise the current interaction model, that is, the set of rules guiding the interactions between all the parties ... [more ▼]

To ease the transition towards the future of distribution grid management, regulators must revise the current interaction model, that is, the set of rules guiding the interactions between all the parties of the system. Five interaction models are proposed, three of them considering active network management. This paper evaluates the economic efficiency of each model using macroscopic representation of the system, by opposition to more techniques requiring a complete picture of the system. The interaction models are simulated on the horizon 2015-2030. Results show that for the first five years all the models provide similar economic efficiency. For the remaining ten years, interaction models implementing active network management provide up to a 10% higher economic efficiency. [less ▲]

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See detailClinically relevant subgroups in COPD and asthma.
Turner, Alice M.; Tamasi, Lilla; SCHLEICH, FLorence ULg et al

in European respiratory review : an official journal of the European Respiratory Society (2015), 24(136), 283-98

As knowledge of airways disease has grown, it has become apparent that neither chronic obstructive pulmonary disease (COPD) nor asthma is a simple, easily defined disease. In the past, treatment options ... [more ▼]

As knowledge of airways disease has grown, it has become apparent that neither chronic obstructive pulmonary disease (COPD) nor asthma is a simple, easily defined disease. In the past, treatment options for both diseases were limited; thus, there was less need to define subgroups. As treatment options have grown, so has our need to predict who will respond to new drugs. To date, identifying subgroups has been largely reported by detailed clinical characterisation or differences in pathobiology. These subgroups are commonly called "phenotypes"; however, the problem of defining what constitutes a phenotype, whether this should include comorbid diseases and how to handle changes over time has led to the term being used loosely. In this review, we describe subgroups of COPD and asthma patients whose clinical characteristics we believe have therapeutic or major prognostic implications specific to the lung, and whether these subgroups are constant over time. Finally, we will discuss whether the subgroups we describe are common to both asthma and COPD, and give some examples of how treatment might be tailored in patients where the subgroup is clear, but the label of asthma or COPD is not. [less ▲]

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See detailStudy of N-linked glycosylation in different life stages of the red flour beetle (Tribolium castaneum)
Smargiasso, Nicolas ULg; Walski, Tomasz; Van Damme, Els et al

Poster (2015, June)

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See detailWASP-121 b: a hot Jupiter in a polar orbit and close to tidal disruption
Delrez, Laetitia ULg; Santerne, A.; Almenara, J.-M. et al

E-print/Working paper (2015)

We present the discovery by the WASP-South survey, in close collaboration with the Euler and TRAPPIST telescopes, of WASP-121 b, a new remarkable short-period transiting hot Jupiter, whose planetary ... [more ▼]

We present the discovery by the WASP-South survey, in close collaboration with the Euler and TRAPPIST telescopes, of WASP-121 b, a new remarkable short-period transiting hot Jupiter, whose planetary nature has been statistically validated by the PASTIS software. The planet has a mass of 1.183+0.064−0.062 MJup, a radius of 1.865 ± 0.044 RJup, and transits every 1.2749255+0.0000020−0.0000025 days an active F6-type main-sequence star (V=10.4, 1.353+0.080−0.079 M⊙, 1.458 ± 0.030 R⊙, Teff = 6460 ± 140 K). A notable property of WASP-121 b is that its orbital semi-major axis is only ∼1.15 times larger than its Roche limit, which suggests that the planet might be close to tidal disruption. Furthermore, its large size and extreme irradiation (∼7.1 10^9 erg s−1cm−2) make it an excellent target for atmospheric studies via secondary eclipse observations. Using the TRAPPIST telescope, we indeed detect its emission in the z′-band at better than ∼4σ, the measured occultation depth being 603 ± 130 ppm. Finally, from a measurement of the Rossiter-McLaughlin effect with the CORALIE spectrograph, we infer a sky-projected spin-orbit angle of 257.8+5.3−5.5 deg. This result indicates a significant misalignment between the spin axis of the host star and the orbital plane of the planet, the planet being in a nearly polar orbit. Such a high misalignment suggests a migration of the planet involving strong dynamical events with a third body. [less ▲]

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See detailExperimental investigation of a reversible heat pump / organic Rankine cycle unit designed to be coupled with a passive house (Net Zero Energy Building)
Dumont, Olivier ULg; Quoilin, Sylvain ULg; Lemort, Vincent ULg

in International Journal of Refrigeration (2015), 54

This paper presents an innovative reversible Heat Pump/Organic Rankine Cycle (HP/ORC) experimental unit designed to be coupled to a Net Zero Energy Building (connected to a 120 m2 thermal solar roof and a ... [more ▼]

This paper presents an innovative reversible Heat Pump/Organic Rankine Cycle (HP/ORC) experimental unit designed to be coupled to a Net Zero Energy Building (connected to a 120 m2 thermal solar roof and a ground heat exchanger). The system can operate in three different modes: an ORC mode to produce electricity when a large amount of heat is collected by the solar roof, a direct heating mode using exclusively the solar roof, and a HP mode for space heating during cold weather conditions. This paper describes a comprehensive experimental campaign carried out on a prototype unit using a modified HVAC scroll compressor (4 kWe). From the results, the technical feasibility of the system is demonstrated. A cycle efficiency of 4.2% is achieved in ORC mode (with condensation and evaporation temperature respectively of 25 C and 88 C) and a COP of 3.1 is obtained in HP mode (with condensation and evaporation temperature respectively of 61 C and 21 C). [less ▲]

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See detailOccupational physicians managing workers long-term sickness absence : are they willing to cooperate with family and social insurance physicians ?
Mairiaux, Philippe ULg; Vanmeerbeek, Marc ULg; Schippers, Nathalie ULg et al

Conference (2015, June)

Introduction In Belgium, sickness absence (SA) management implies complementary roles for family (FPs), social insurance (SIPs) and occupational physicians (OPs): FPs deliver sick notes, SIPs control SA ... [more ▼]

Introduction In Belgium, sickness absence (SA) management implies complementary roles for family (FPs), social insurance (SIPs) and occupational physicians (OPs): FPs deliver sick notes, SIPs control SA benefits and OPs strive to adapt work environments to workers’ capacities. In practice however, there is little cooperation between the three physicians. This study aimed at identifying FP-OP-SIP cooperation channels in order to prevent long-term work disability. Methods The study involved two phases. (1) Using the nominal group technique, researchers from the three physician groups reached a consensus on 15 proposals to enhance inter-professional cooperation. (2) A Delphi study was conducted to validate these proposals: 61 experts representing professional groups of physicians (FP, SIP, OP), patients, government, employers and labor unions were asked to participate. A 18-items questionnaire (the 15 proposals + 3 open questions) was used in a 2-round Delphi study. Proposals were accepted if 80% of experts agreed. Results Participation rate was 77% in round 1 and 7 out of the 15 proposals were accepted. During round 2, participation rate was 94%; 2 of the remaining proposals reached agreement level. Public authorities were thus advised to invest in a) promotion of pre-return to work visit with the OP for sick-listed patients; b) a website with OPs contact data; c) joint guidelines for return to work guidance; d) joint training of the 3 physician groups; 5) safe electronic information exchange. Several proposals aiming at giving work-related information to FPs and SIPs did not reach agreement within the OPs expert group. OPs expressed concerns about their own workload and FPs or SIPs ability to understand and use those information. Discussion The need for inter-physician cooperation in disability management may exceed individual goodwill and should best be organised by public authorities. This study may be a first step in this process. [less ▲]

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See detailExtended end-plate to concrete- filled rectangular column joint using long bolts
Hoang, Van Long ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Journal of Constructional Steel Research (2015), 113

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See detailVers une érosion du soutien à la dissuasion nucléaire française ?
Dumoulin, André ULg

in focus paper (2015), (31),

Examen des débats favorables et défavorables à l'engagement d'un débat sur l'avenir de la dissuasion nucléaire en Francce

Detailed reference viewed: 22 (0 ULg)