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See detailInfections des voies génitales: Introduction et Infections Sexuellement Transmissibles
Melin, Pierrette ULg

in Melin, Pierrette (Ed.) Les infections de la sphères génitales (2015, October)

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See detailLa vulnerabilidad como valor jurídico-ético para asegurar el «best interest» de los menores: comparación entre el tribunal europeo de derechos humanos y el tribunal de justicia de la Unión Europea
Colussi, Ilaria Anna ULg

in Alvarez Vélez, Isabel; Rey Pérez, José Louis (Eds.) Derecho y pobreza (2015, October)

Within the concept of "vulnerability" - considered as an inherent or innate value of the human being, from which it is necessary to start in order to build a genuine social policy- the children's ... [more ▼]

Within the concept of "vulnerability" - considered as an inherent or innate value of the human being, from which it is necessary to start in order to build a genuine social policy- the children's vulnerability occupies a special position. Traditionally, children have been treated as objects of protection and not as subjects of rights according to an authoritarian and paternalistic perspective. Over time, a different view of this matter has developed, and it has put the child at the center of attention, considering his vulnerabilities, needs and interests. This perspective has been reflected in the legislation, in case law and doctrine, both internationally and nationally. The concept of "best interest" is the key for addressing children's vulnerability of children and developing substantive equality for them. The European Court of Human Rights in Strasbourg and the Court of Justice of the European Union in Luxembourg have defined this concept in different areas: in the field of international child abduction, immigration, asylum and family reunification, custody and parental responsibility. Although these two tribunals have grounded their arguments on different legal perspectives, both have shown and still show a trend towards convergence to common points, through a balanced consideration of rights in this area. This communication aims at examining the relevant jurisprudence of the aforementioned tribunals about the notion of "best interest" of the child. The case-law since 2011 until 2015 has been taken into account. [less ▲]

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See detailA Generic Feature Selection Method for Background Subtraction Using Global Foreground Models
Braham, Marc ULg; Van Droogenbroeck, Marc ULg

in Advanced Concepts for Intelligent Vision Systems (2015, October)

Over the last few years, a wide variety of background subtraction algorithms have been proposed for the detection of moving objects in videos acquired with a static camera. While much effort have been ... [more ▼]

Over the last few years, a wide variety of background subtraction algorithms have been proposed for the detection of moving objects in videos acquired with a static camera. While much effort have been devoted to the development of robust background models, the automatic spatial selection of useful features for representing the background has been neglected. In this paper, we propose a generic and tractable feature selection method. Interesting contributions of this work are the proposal of a selection process coherent with the segmentation process and the exploitation of global foreground models in the selection strategy. Experiments conducted on the ViBe algorithm show that our feature selection technique improves the segmentation results. [less ▲]

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See detailCombining Features for Cover Song Identification
Osmalsky, Julien ULg; Embrechts, Jean-Jacques ULg; Foster, Peter et al

in 16th International Society for Music Information Retrieval Conference (2015, October)

In this paper, we evaluate a set of methods for combining features for cover song identification. We first create multiple classifiers based on global tempo, duration, loudness, beats and chroma average ... [more ▼]

In this paper, we evaluate a set of methods for combining features for cover song identification. We first create multiple classifiers based on global tempo, duration, loudness, beats and chroma average features, training a random forest for each feature. Subsequently, we evaluate standard combination rules for merging these single classifiers into a composite classifier based on global features. We further obtain two higher level classifiers based on chroma features: one based on comparing histograms of quantized chroma features, and a second one based on computing cross-correlations between sequences of chroma features, to account for temporal information. For combining the latter chroma-based classifiers with the composite classifier based on global features, we use standard rank aggregation methods adapted from the information retrieval literature. We evaluate performance with the Second Hand Song dataset, where we quantify performance using multiple statistics. We observe that each combination rule outperforms single methods in terms of the total number of identified queries. Experiments with rank aggregation me- thods show an increase of up to 23.5 % of the number of identified queries, compared to single classifiers. [less ▲]

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See detailPerinatal Group B streptococcal Disease
Melin, Pierrette ULg

in Melin, Pierrette (Ed.) Les infections de la sphères génitales (2015, October)

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See detailLe développement de la pensée algébrique : quelles différences entre les raisonnements mis en place par les élèves avant et après l'introduction de l'algèbre ?
Demonty, Isabelle ULg; Fagnant, Annick ULg; Vlassis, Joëlle

in Actes du congrès EMF 2015. Pluralités culturelles et universalité des mathématiques : enjeux et perspectives pour leur enseignement et leur apprentissage. (2015, October)

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See detailHypogonadisme hypogonadotrope normosmique familial : identification d'une nouvelle mutation c.1664-2A> T du gène FGFR1
VALDES SOCIN, Hernan Gonzalo ULg; Pintiaux, Axelle ULg; LIBIOULLE, Cécile ULg et al

in Abstract book - Annales d'Endocrinologie - 32ème Congrès de la Société Française d'Endocrinologie (2015, October)

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See detailLe projet expérimental multidisciplinaire (PEMD) en 3ème Bachelier à Gembloux
Colaux-Castillo, Catherine; Pochet, Bernard ULg

in Former aux compétences informationnelles à l'heure du web 2.0 et des discovery tools (2015, September 28)

Cette courte présentation, dans l'atelier 3 du colloque ILIB15, décrit l'intégration d'un cours (« littérature scientifique et méthodologie documentaire »), dont le titulaire est un bibliothécaire, dans ... [more ▼]

Cette courte présentation, dans l'atelier 3 du colloque ILIB15, décrit l'intégration d'un cours (« littérature scientifique et méthodologie documentaire »), dont le titulaire est un bibliothécaire, dans une unité d’apprentissage intégrée basée sur la résolution d'un problème concret de recherche dans un contexte scientifique non familier. Ce cours a été proposé pour la première fois durant l'année académique 2014-2015 à une partie des étudiants du bloc trois du Master Bioingénieur, orientation Sciences et technologies de l’environnement de l'Université de Liège. Cette activité se déroule en plusieurs phases sur les deux quadrimestres. [less ▲]

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See detailMilk production, milking frequency and rumination time of grazing dairy cows milked by a mobile milking robot.
Lessire, Françoise ULg; Hornick, Jean-Luc ULg; Minet, Julien ULg et al

in Conington, J; Klopcic, M; Lauridsen, C (Eds.) et al Book of abstracts of the 66th Annual meeting of the European Federation of animal science (2015, September 28)

In Europe, analysis of meteorological data shows that the average temperature has increased by ~1°C over the past hundred years (IPCC, 2013). Heat stress periods are thus expected to be more frequent even ... [more ▼]

In Europe, analysis of meteorological data shows that the average temperature has increased by ~1°C over the past hundred years (IPCC, 2013). Heat stress periods are thus expected to be more frequent even in temperate areas. The use of an automatic milking system (AMS) implies the need to stimulate cows’ traffic to the robot, especially with grazing cows. Describing how heat stress influenced cows’ traffic to the robot is the aim of this study. Grazing dairy cows milked by an automatic system (AMS) experienced heat stress (HS) periods, twice during the summer 2013 in July (J) and August (A). The daily temperature humidity index (THI) during these periods were higher than 75. Each HS period was compared with a “normal period”(N), presenting the same number of cows, similar lactation number, days in milk, distance to come back to the robot and an equal access to water. The first HS period of 5 days with a mean THI of 78.4 was chosen in J, and a second that lasted for 6 days in A with a THI value of 77.3. Heat stress periods were cut off with the same duration of days with no stress (N) and mean THI <70. Milk production, milkings and refusals to the robot during HS were compared with N periods. Milkings and refusals were significantly more numerous in HS periods in July (HS: 2.54 ± 0.11 vs N: 2.19 ± 0.08, 1.87 ± 0.20 vs 0.72 ± 0.16) but milk production dropped from 21.8 ±0.6 kg per cow and per day during N periods to 18.9 ± 0.8 kg in HS. In August, MY increased slightly during HS. This could be explained by less high ambient temperatures and decreased distance to walk inducing less energy expenditure. The increase in milkings and refusals to the robot during HS could be linked to water availability nearby the robot and confirmed previous findings (Lessire et al., 2014). [less ▲]

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See detailTools for Measuring a City’s Resilience in a Fire Following Earthquake Scenario
Elhami Khorasani, Negar; Gernay, Thomas ULg; Garlock, Maria

in Proceedings of IABSE Conference - Structural Engineering: Providing Solutions to Global Challenges (2015, September 25)

The paper provides a framework to evaluate the response of buildings in a community subject to fire following earthquake. First, a model is developed to determine the probability of ignition in buildings ... [more ▼]

The paper provides a framework to evaluate the response of buildings in a community subject to fire following earthquake. First, a model is developed to determine the probability of ignition in buildings of a community due to an earthquake. Second, fragility functions are developed for buildings subject to fire, to quantify the structural damage and the expected losses. The ignition model, combined with the fragility functions, can be implemented in a GIS based risk management platform to evaluate economical losses in a region from fire following an earthquake. [less ▲]

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See detailDesign and modelisation of ASPIICS optics
Galy, Camille ULg; Fineschi, S.; Galano, D. et al

in Proc. SPIE Volume 9604 Solar Physics and Space Weather Instrumentation VI (2015, September 21)

In the framework of development of ASPIICS (Association of Spacecraft for Polarimetric and Imaging Investigation of the Corona of the Sun), the Centre Spatial de Liege is responsible of the optical design ... [more ▼]

In the framework of development of ASPIICS (Association of Spacecraft for Polarimetric and Imaging Investigation of the Corona of the Sun), the Centre Spatial de Liege is responsible of the optical design of the coronagraph and the optics will be manufactured by TOPTEC. The particularity of this coronagraph is to have an external occulter located 150 m ahead of the first imaging lens. This external occulter is re-imaged on an internal occulter which function is - as in a classical externally occulted Lyot coronagraph - to block the sun light diffracted by the external occulter and to reduce the straylight on the detector. The selection of this configuration is driven by the requirement to observe the corona as close as possible to the solar limb (i.e. 1 RSun) without imaging the limb itself. A requirement of 1.08 RSun is specified at optical design level to grant 1.2 Rsun at instrument level. The coronograph instrument is designed to have a field of view of 1.6° x 1.6° with a resolution of less than 6 arcsec. Its performances are limited by diffraction in a 530 – 590 nm wavelength range. This paper presents the optical design and demonstrates that by design the requirements are fulfilled within the misalignment, manufacturing and thermo-elastic error contributions. [less ▲]

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See detailOPSE metrology system onboard of the PROBA3 mission of ESA
Loreggia, D.; Bemporad, A.; Capobianco, G. et al

in Proc. SPIE Volume 9604 Solar Physics and Space Weather Instrumentation VI (2015, September 21)

In recent years, ESA has assessed several mission involving formation flying (FF). The great interest in this topics is mainly driven by the need for moving from ground to space the location of next ... [more ▼]

In recent years, ESA has assessed several mission involving formation flying (FF). The great interest in this topics is mainly driven by the need for moving from ground to space the location of next generation astronomical telescopes overcoming most of the critical problems, as example the construction of huge baselines for interferometry. In this scenario, metrology systems play a critical role. PROBA3 is an ESA technology mission devoted to in-orbit demonstration of the FF technique, with two satellites, an occulter and a main satellite housing a coronagraph named ASPIICS, kept at an average inter-distance by about 144m, with micron scale accuracy. The guiding proposal is to test several metrology solution for spacecraft alignment, with the important scientific return of having observation of Corona at never reached before angular field. The Shadow Position Sensors (SPS), and the Optical Position Emitters Sensors (OPSE) are two of the systems used for FF fine tracking. The SPS are finalized to monitor the position of the two spacecraft with respect to the Sun and are discussed in dedicated papers presented in this conference. The OPSE will monitor the relative position of the two satellites and consists of 3 emitters positioned on the rear surface of the occulter, that will be observed by the coronagraph itself. By following the evolution of the emitters images at the focal plane the alignment of the two spacecrafts is retrieved via dedicated centroiding algoritm. We present an overview of the OPSE system and of the centroiding approach. [less ▲]

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See detailDesign status of ASPIICS, an externally occulted coronagraph for PROBA-3
Renotte, Etienne ULg; Alia, A.; Bemporad, A. et al

in Proc. SPIE Volume 9604 Solar Physics and Space Weather Instrumentation VI (2015, September 21)

The “sonic region” of the Sun corona remains extremely difficult to observe with spatial resolution and sensitivity sufficient to understand the fine scale phenomena that govern the quiescent solar corona ... [more ▼]

The “sonic region” of the Sun corona remains extremely difficult to observe with spatial resolution and sensitivity sufficient to understand the fine scale phenomena that govern the quiescent solar corona, as well as phenomena that lead to coronal mass ejections (CMEs), which influence space weather. Improvement on this front requires eclipse-like conditions over long observation times. The space-borne coronagraphs flown so far provided a continuous coverage of the external parts of the corona but their over-occulting system did not permit to analyse the part of the white-light corona where the main coronal mass is concentrated. The proposed PROBA-3 Coronagraph System, also known as ASPIICS (Association of Spacecraft for Polarimetric and Imaging Investigation of the Corona of the Sun), with its novel design, will be the first space coronagraph to cover the range of radial distances between ~1.15 and 3 solar radii where the magnetic field plays a crucial role in the coronal dynamics, thus providing continuous observational conditions very close to those during a total solar eclipse. PROBA-3 is first a mission devoted to the in-orbit demonstration of precise formation flying techniques and technologies for future European missions, which will fly ASPIICS as primary payload. The instrument is distributed over two satellites flying in formation (approx. 150m apart) to form a giant coronagraph capable of producing a nearly perfect eclipse allowing observing the sun corona closer to the rim than ever before. The coronagraph instrument is developed by a large European consortium including about 20 partners from 7 countries under the auspices of the European Space Agency. This paper is reviewing the recent improvements and design updates of the ASPIICS instrument as it is stepping into the detailed design phase. [less ▲]

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See detailThe Shadow Positioning Sensors (SPS) for formation flying metrology on-board the ESA-PROBA3 mission
Bemporad, A.; Baccani, C.; Capobianco, G. et al

in Proc. SPIE Volume 9604 Solar Physics and Space Weather Instrumentation VI (2015, September 21)

PROBA3 is an ESA technology mission devoted to in-orbit demonstration of the formation flight (FF) technique, with two satellites kept at an average inter-distance by about 144 m. The ASPIICS instrument ... [more ▼]

PROBA3 is an ESA technology mission devoted to in-orbit demonstration of the formation flight (FF) technique, with two satellites kept at an average inter-distance by about 144 m. The ASPIICS instrument on-board PROBA3 will be the first ever space-based coronagraph working on one satellite and having the external occulter located on the second satellite, thus allowing observations of the inner solar corona with unprecedented reduction of stray light. During the observational periods, the FF configuration will be maintained with very high precision and two different techniques will be implemented: the use of Shadow Positioning Sensors (SPS) located on the Coronagraph Spacecraft (diodes measuring the penumbral light intensity on the entrance pupil plane) and the use of Occulter Position Sensor LEDs (OPSE) located on the back side of the Occulter Spacecraft. This paper will review the main instrumental requirements on the SPS needed to determine the 3-dimensional relative positioning of the two PROBA3 satellites with the high precision and frequency. [less ▲]

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See detailFormation flying metrology for the ESA-PROBA3 mission: the Shadow Position Sensors (SPS) silicon photomultipliers (SiPMs) readout electronics
Focardi, M.; Bemporad, A.; Buckley, S. et al

in Proc. SPIE Volume 9604 Solar Physics and Space Weather Instrumentation VI (2015, September 21)

The European Space Agency (ESA) is planning to launch in 2018 the PROBA3 Mission, designed to demonstrate the inorbit formation flying (FF) attitude capability of its two satellites and to observe the ... [more ▼]

The European Space Agency (ESA) is planning to launch in 2018 the PROBA3 Mission, designed to demonstrate the inorbit formation flying (FF) attitude capability of its two satellites and to observe the inner part of the visible solar corona as the main scientific objective. The solar corona will be observed thanks to the presence on the first satellite, facing the Sun, of an external occulter producing an artificial eclipse of the Sun disk. The second satellite will carry on the coronagraph telescope and the digital camera system in order to perform imaging of the inner part of the corona in visible polarized light, from 1.08 Rsun up to about 3 Rsun. One of the main metrological subsystems used to control and to maintain the relative (i.e. between the two satellites) and absolute (i.e. with respect to the Sun) FF attitude is the Shadow Position Sensor (SPS) assembly. It is composed of eight micro arrays of silicon photomultipliers (SiPMs) able to measure with the required sensitivity and dynamic range the penumbral light intensity on the Coronagraph entrance pupil. In the following of the present paper we describe the overall SPS subsystem and its readout electronics with respect to the capability to satisfy the mission requirements, from the light conversion process on board the silicon-based SPS devices up to the digital signal readout and sampling. [less ▲]

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See detailSignificance of the occulter diffraction for the PROBA3/ASPIICS formation flight metrology
Landini, F.; Bemporad, A.; Focardi, M. et al

in Proc. SPIE Volume 9604 Solar Physics and Space Weather Instrumentation VI (2015, September 21)

PROBA-3/ASPIICS is a formation Flying coronagraph selected by ESA and currently in its C/D phase. It is constituted by two spacecrafts (OSC, Occulter SpaceCraft, carrying the occulter, diameter 142 cm ... [more ▼]

PROBA-3/ASPIICS is a formation Flying coronagraph selected by ESA and currently in its C/D phase. It is constituted by two spacecrafts (OSC, Occulter SpaceCraft, carrying the occulter, diameter 142 cm, and CSC, Coronagraph SpaceCraft, with the telescope) separated by ~144 m, kept in strict alignment by means of an active custom system. The alignment active system most critical components are the Shadow Positioning Sensors (SPS), a series of Si-PM (Silicon Photomultiplier) measuring the penumbra generated by the occulter. The arrangement of the SPSs around the telescope entrance aperture is defined as a trade-off between mechanical constraints and maximum sensitivity to misalignments. The signal detected by the SPSs can be approximately simulated with a geometrical analysis based on the variation of the penumbra generated by the external occulter. The stray light generated by the diffraction from the external occulter may affect the SPSs signal. It is mandatory to carefully evaluate its level in order to refine the active alignment adjustment algorithm. This work is dedicated to the description of the preliminary investigation performed in order to evaluate the impact of the diffraction on the SPSs signal. [less ▲]

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See detailExoplanet science with the LBTI: instrument status and plans
Defrère, D.; Hinz, P.; Skemer, A. et al

in Shaklan, Stuart (Ed.) Techniques and Instrumentation for Detection of Exoplanets VII (2015, September 16)

The Large Binocular Telescope Interferometer (LBTI) is a strategic instrument of the LBT designed for high-sensitivity, high-contrast, and high-resolution infrared (1.5-13 $\mu$m) imaging of nearby ... [more ▼]

The Large Binocular Telescope Interferometer (LBTI) is a strategic instrument of the LBT designed for high-sensitivity, high-contrast, and high-resolution infrared (1.5-13 $\mu$m) imaging of nearby planetary systems. To carry out a wide range of high-spatial resolution observations, it can combine the two AO-corrected 8.4-m apertures of the LBT in various ways including direct (non-interferometric) imaging, coronagraphy (APP and AGPM), Fizeau imaging, non-redundant aperture masking, and nulling interferometry. It also has broadband, narrowband, and spectrally dispersed capabilities. In this paper, we review the performance of these modes in terms of exoplanet science capabilities and describe recent instrumental milestones such as first-light Fizeau images (with the angular resolution of an equivalent 22.8-m telescope) and deep interferometric nulling observations. [less ▲]

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See detailAnnotations as reflection amplifiers in online learning - An exploratory study
Verpoorten, Dominique ULg; Specht, Marcus; Westera, Wim

in Ullmann, T; Kravcik, M; Mikroyannidis, A (Eds.) et al Proceedings of the 5th Workshop on Awareness and Reflection in Technology-Enhanced Learning (ARTEL). In conjunction with the 10th european conference on technology enhanced learning: Design for teaching and learning in a networked world. (2015, September 15)

In a controlled experiment on the effects of frequent and local digital annotations, 137 volunteers covered an online course at 3 conditions: no/free/question-based electronic annotations. Results show no ... [more ▼]

In a controlled experiment on the effects of frequent and local digital annotations, 137 volunteers covered an online course at 3 conditions: no/free/question-based electronic annotations. Results show no difference in performance between groups. However, analyses conducted within treatments suggest positive impacts on performance when annotation rates are taken into consideration, and coupled with other reflective enactments. [less ▲]

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See detailLearning to look - Purpose and design of an awareness-raising online course in veterinary sciences
Tasnier, Sophie ULg; Busoni, Valeria ULg; Hanzen, Christian ULg et al

in Prilla, M; Ullmann, T; Kravcik, M (Eds.) et al Proceedings of the 5th Workshop on Awareness and Reflection in Technology-Enhanced Learning (2015, September 15)

This paper reports on a work in progress: an online self-instruction course created to stimulate students’ awareness processes when dealing with pictures. Using non-clinical material, the “Learning to ... [more ▼]

This paper reports on a work in progress: an online self-instruction course created to stimulate students’ awareness processes when dealing with pictures. Using non-clinical material, the “Learning to Look” course was de-signed as a preliminary training to the observation of histological sections, radi-ological graphs, and other specialized visual material. Following a presentation of the project, salient results of a feedback questionnaire completed by 382 stu-dents about their experience of the course are provided. [less ▲]

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See detailOptimized focal and pupil plane masks for vortex coronagraphs on telescopes with obstructed apertures
Ruane, Garreth; Absil, Olivier ULg; Huby, Elsa ULg et al

in Shaklan, Stuart (Ed.) Techniques and Instrumentation for Detection of Exoplanets VII (2015, September 11)

We present methods for optimizing pupil and focal plane optical elements that improve the performance of vortex coronagraphs on telescopes with obstructed or segmented apertures. Phase-only and complex ... [more ▼]

We present methods for optimizing pupil and focal plane optical elements that improve the performance of vortex coronagraphs on telescopes with obstructed or segmented apertures. Phase-only and complex masks are designed for the entrance pupil, focal plane, and the plane of the Lyot stop. Optimal masks are obtained using both analytical and numerical methods. The latter makes use of an iterative error reduction algorithm to calculate "correcting" optics that mitigate unwanted diffraction from aperture obstructions. We analyze the achieved performance in terms of starlight suppression, contrast, off-axis image quality, and chromatic dependence. Manufacturing considerations and sensitivity to aberrations are also discussed. This work provides a path to joint optimization of multiple coronagraph planes to maximize sensitivity to exoplanets and other faint companions. [less ▲]

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See detailA Mach-Zehnder interferometer based on orbital angular momentum for improved vortex coronagraph efficiency
Piron, Pierre ULg; Delacroix, Christian; Huby, Elsa ULg et al

in Shaklan, Stuart (Ed.) Techniques and Instrumentation for Detection of Exoplanets VII (2015, September 11)

The Annular Groove Phase Mask (AGPM) is a vectorial vortex phase mask. It acts as a half-wave plate with a radial fast axis orientation operating in the mid infrared domain. When placed at the focus of a ... [more ▼]

The Annular Groove Phase Mask (AGPM) is a vectorial vortex phase mask. It acts as a half-wave plate with a radial fast axis orientation operating in the mid infrared domain. When placed at the focus of a telescope element provides a continuous helical phase ramp for an on axis sources, which creates the orbital angular momentum. Thanks to that phase, the intensity of the central source is canceled by a down-stream pupil stop, while the off axis sources are not affected. However due to experimental conditions the nulling is hardly perfect. To improve the null, a Mach-Zehnder interferometer containing Dove prisms differently oriented can be proposed to sort out light based on its orbital angular momentum (OAM). Thanks to the differential rotation of the beam, a π phase shift is achieved for the on axis light affected by a non zero OAM. Therefore the contrast between the star and its faint companion is enhanced. Nevertheless, due the Dove prisms birefringence, the performance of the interferometer is relatively poor. To solve this problem, we propose to add a birefringent wave-plate in each arm to compensate this birefringence. In this paper, we will develop the mathematical model of the wave front using the Jones formalism. The performance of the interferometer is at first computed for the simple version without the birefringent plate. Then the effect of the birefringent plate is be mathematically described and the performance is re-computed. [less ▲]

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See detailNutritional treatment of food allergy in dogs and cats : an update.
Diez, Marianne ULg

in Proceedings of the 25th ECVIM Congress (2015, September 10)

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See detail1. Actualités en ravageurs - 1. Saison 2015 : attaque et dégâts de cécidomyie orange du blé
Hautier, Louis; Chavalle, Sandrine ULg; De Proft, Michel

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detail6. Protection intégrée des semis et des jeunes emblavures
Henriet, François; Chavalle, Sandrine ULg; Bataille, Charlotte et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detailLivre Blanc Céréales
Sinnaeve, Georges; Gofflot, S.; Chandelier, anne et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detail1. Actualités en ravageurs - 2. Variétés résistantes à la cécidomyie orange du blé : intérêt agronomique et méthode de caractérisation
Chavalle, Sandrine ULg; Jacquemin, Guillaume; De Proft, Michel

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detail3. Variétés - 2. Escourgeon et orge d'hiver fourragers
Monfort, Bruno; Mahieu, Olivier; Jacquemin, Guillaume et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detailLow-order models of a single-screw expander for organic Rankine cycle applications
Ziviani, Davide; Desideri, Adriano ULg; Lemort, Vincent ULg et al

in Low-order models of a single-screw expander for organic Rankine cycle applications D. (2015, September 10)

Screw-type volumetric expanders have been demonstrated to be a suitable technology for organic Rankine cycle (ORC) systems because of higher overall effectiveness and good part-load behaviour over other ... [more ▼]

Screw-type volumetric expanders have been demonstrated to be a suitable technology for organic Rankine cycle (ORC) systems because of higher overall effectiveness and good part-load behaviour over other positive displacement machines. An 11 kWe single-screw expander (SSE) adapted from an air compressor has been tested in an ORC test-rig operating with R245fa as working fluid. A total of 60 steady-steady points have been obtained at four different rotational speeds of the expander in the range between 2000 rpm and 3300 rpm. The maximum electrical power output and overall isentropic effectiveness measured were 7.3 kW and 51.9%, respectively. In this paper, a comparison between two low-order models is proposed in terms of accuracy of the predictions, the robustness of the model and the computational time. The first model is the Pacejka equation-based model and the second is a semi-empirical model derived from a well-known scroll expander model and modified to include the geometric aspects of a single screw expander. The models have been calibrated with the available steady-state measurement points by identifying the proper parameters. 1. [less ▲]

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See detail3. Variétés - 1. Froment d'hiver
Meza Morales, Walter ULg; Eylenbosch, Damien ULg; Jacquemin, Guillaume et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2015, September 10)

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See detailStraw-bale walls for sustainable architecture: Improving and promoting straw-bale use in European Buildings
Evrard, Arnaud; Biot, Benjamin; Keutgen, Gauthier et al

in Cucinella; Giulia (Eds.) Architecture in (R)Evolution (2015, September 09)

Straw-bale use in buildings may be an interesting way to decrease our energy needs and our impact on the environment. Moreover, it fosters a local economy and the creation of new jobs in the building ... [more ▼]

Straw-bale use in buildings may be an interesting way to decrease our energy needs and our impact on the environment. Moreover, it fosters a local economy and the creation of new jobs in the building industry. Combined with earth materials and other well-selected materials and systems, it allows creative designers to integrate highly efficient, low-tech and reusable envelopes in comfortable and healthy places. The present paper summarizes the results of a four year R&D program aiming to improve and promote the use of straw bale in buildings and also to remove uncertainties concerning this use. Three main aspects are pinpointed and discussed: hygrothermal transfer and storage in straw-bale walls, regulation of indoor conditions and environmental impact in the long term. These three topics were submitted to European experts (France, England and Germany) in order to discuss a cross-comparison of results obtained on a larger scale. The paper shows that straw-bale use in buildings is a relevant and innovative solution in facing one of the major challenges of today and tomorrow: "How to build/transform comfortable and affordable buildings with local resources and with a positive impact on the environment?". [less ▲]

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See detailAssessing electrical resistivity tomography for hydrofacies detection using a sensitivity dependent probabilistic methodology
Hermans, Thomas ULg; Irving, James

in EarthDoc - Near Surface Geosciences 2015 (2015, September 08)

Alluvial aquifers are generally composed of several facies with complex architectures and interconnections depending on the fluvial system. In this context, electrical resistivity tomography (ERT) may ... [more ▼]

Alluvial aquifers are generally composed of several facies with complex architectures and interconnections depending on the fluvial system. In this context, electrical resistivity tomography (ERT) may provide important information on the spatial distribution of hydrogeological parameters. However, ERT inversion introduces some bias in the resulting resistivity distribution due to regularization and resolution issues. In this study, we refine ERT inversions by incorporating prior information in order to improve the identification of facies through a probabilistic relationship derived from collocated measurements. We then analyze with synthetic cases the effect of spatially varying sensitivity on the probabilistic relationship. As expected, when sensitivity decreases, the distributions of resistivity for the different facies tend to be superimposed. A mean distribution thus overestimates the ability of surface ERT to discriminate hydrofacies in depth. [less ▲]

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See detailFragility Analysis of a Steel Building in Fire
Gernay, Thomas ULg; Elhami Khorasani, Negar; Garlock, Maria

in Usmani, Asif; Lu, Yong; Das, Purnendu (Eds.) Proceedings of the First International Conference on Structural Safety under Fire & Blast - CONFAB 2015 (2015, September 03)

Community resilience to extreme events is an issue of increasing concern in our interconnected and urbanized societies. This work provides a framework to evaluate the response of a community of buildings ... [more ▼]

Community resilience to extreme events is an issue of increasing concern in our interconnected and urbanized societies. This work provides a framework to evaluate the response of a community of buildings to fire following earthquake, a potentially highly destructive cascading multi-hazard event. In a previous part of the work, a model has been developed to predict the probability of ignition in a building due to an earthquake. Given an ignition in a building, the probability of the structure exceeding certain limit states must be evaluated in order to quantify the expected damage loss. Adopting an approach similar to that used in seismic engineering, fragility functions can be developed for structures subjected to fire. The methodology is described here for a prototype nine-story steel frame building. In developing the fragility functions, uncertainties in the fire model, the heat transfer model and the thermo-mechanical response are considered. In addition several fire scenarios at different locations in the building are studied. The demand on and capacity of the system are assessed probabilistically in terms of critical temperature. The developed fire fragility functions yield the probability of exceedance of predefined damage states as a function of the fire load in the building. Future works will aim to implement fire fragility functions into a GIS based risk assessment software platform for assessment of the expected risk and cost associated with fire following earthquake for a community of buildings. [less ▲]

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See detailStar Formation and Evolution as seen with Athena
Rauw, Gregor ULg; Sciortino, Salvatore; Hornschemeier, Ann et al

in Exploring the Hot and Energetic Universe: The first scientific conference dedicated to the Athena X-ray observatory. Proceedings of a conference held 8-10 September, 2015 in Madrid, Spain. Online at <A href="http://www.sciops.esa.int/index.php?project=CONF2015&page=ATHENA2015">http://www.sciops.esa.int/index.php?project=CONF2015&page=ATHENA2015</A>, p.36 (2015, September 01)

Stars over a wide range of masses and evolutionary stages are nowadays known to emit X-rays. This X-ray emission probes the most energetic phenomena occurring in the circumstellar environment of these ... [more ▼]

Stars over a wide range of masses and evolutionary stages are nowadays known to emit X-rays. This X-ray emission probes the most energetic phenomena occurring in the circumstellar environment of these stars, and provides precious insight on magnetic phenomena or hydrodynamic shocks. Owing to its unprecedented capabilities, Athena will open up an entirely new window on these phenomena. Athena will not only allow us to study many more objects with an unprecedented spectral resolution, but will also pioneer the study of the dynamics of these objects via time-resolved high-resolution spectroscopy. These studies will lead to a deeper understanding of yet poorly understood processes which have profound impact in star formation and evolution, including at earlier times in the Universe. They also are important to understanding feedback processes on Galactic scale. [less ▲]

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See detailHD 97658 and its super-Earth
Van Grootel, Valérie ULg; Gillon, Michaël ULg; Valencia, D. et al

in European Physical Journal Web of Conferences (2015, September 01)

Super-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition ... [more ▼]

Super-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition. We present the confirmation, based on Spitzer observations, that the super-Earth HD 97658 b transits its host star. HD 97658 is a low-mass (M*=0.77+-0.05 Msun) K1 dwarf, as determined from the Hipparcos parallax and stellar evolution modeling. To constrain the planet parameters, we carry out Bayesian global analyses of Keck-HIRES radial velocities, and MOST and Spitzer photometry. HD 97658 b is a massive (Mp=7.55 +0.83,-0.79 Mearth) and large (Rp = 2.247 +0.098,-0.095 Rearth at 4.5 microns) super-Earth. We investigate the possible internal compositions for HD 97658 b. Our results indicate a large rocky component, by at least 60% by mass, and very little H-He components, at most 2% by mass. We also discuss how future asteroseismic observations can improve the knowledge of the HD 97658 system, in particular by constraining its age. [less ▲]

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See detailMagnetic fields in O-, B- and A-type stars on the main sequence
Briquet, Maryline ULg

in European Physical Journal Web of Conferences (2015, September 01)

In this review, the latest observational results on magnetic fields in main-sequence stars with radiative envelopes are summarised together with the theoretical works aimed at explaining them.

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See detailEfficacité du traitement des tendinopathies chroniques par infiltration de plasma riche en plaquettes
Kaux, Jean-François ULg; Sancerne, Audrey; Libertiaux, Vincent ULg

in 8ème Congrès Commun SFMES - SFTS (2015, September)

Introduction: Les tendinopathies sont des pathologies d’hyperutilisation essentiellement présentent chez les sportifs ainsi que les travailleurs manuels. Elles représentent près de 20% des troubles ... [more ▼]

Introduction: Les tendinopathies sont des pathologies d’hyperutilisation essentiellement présentent chez les sportifs ainsi que les travailleurs manuels. Elles représentent près de 20% des troubles musculo-squelettiques et plus de 30% des consultations en médecine générale et en médecine sportive. Ces tendinopathies peuvent être rebelles aux traitements conservateurs, raison pour laquelle de nouveaux traitements sont développés parmi lesquels figurent les infiltrations de plasma riche en plaquettes (PRP). L’objectif de notre étude est d’évaluer l’effet d’une injection de PRP suivie d’un protocole de rééducation standardisé chez des patients présentant différentes tendinopathies : épicondylites, tendinopathies du moyen glutéus, patellaires, calcanéennes et fasciites plantaires. Enfin, nous souhaitons mettre en évidence des facteurs biologiques de bon pronostic suite à un traitement par PRP. Matériels et méthodes : 51 patients atteints de différentes tendinopathies, réfractaires aux traitements de kinésithérapie classique depuis au moins 3 mois, ont reçu une injection de PRP sous contrôle échographique sans anesthésie locale. Par la suite, ils ont bénéficié d’une rééducation excentrique standardisée. Aux trois temps de l’étude (pré-injection, 6 semaines et 12 semaines), ils ont reçu une évaluation algo-fonctionnelle (EVA, PRTEE, HOOS, VISA-P, VISA-A, FAAM) en fonction de la localisation de la tendinopathie et une évaluation de la douleur par un algomètre de pression. Résultats : Les résultats montrent d’une manière générale une amélioration significative de l’EVA (p=0,01) après 3 mois de suivi et une amélioration de l’algomètre de pression entre 6 et 12 semaines (p=0,05). Pour les épicondylites, les améliorations sont significatives pour l’EVA (p=0,017) et le PRTEE (p=0,0036) au terme de l’étude. Les tendinopathies du moyen glutéus, patellaires et les fasciites plantaires montrent également une amélioration clinique mais non significative (nombre de sujets trop faible). Concernant les tendinopathies d’Achille, l’EVA (p<0.001) et le VISA-A (p=0,018) évoluent de manière significative après les 6 premières semaines. Aucune relation n’a été mise en évidence entre l’évolution de l’EVA et de l’algomètre de pression et les paramètres biologiques. Conclusions : Une injection de PRP couplée à un programme de rééducation excentrique présente des effets positifs au niveau de la symptomatologie douloureuse et la fonctionnalité pour les épicondylites et les tendinopathies d’Achille. Malgré l’absence de résultats significatifs, la tendance est à l’amélioration clinique concerne également les tendinopathies du moyen glutéal, patellaires et les fasciites plantaires. [less ▲]

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See detailSimple Median-Based Method for Stationary Background Generation Using Background Subtraction Algorithms
Laugraud, Benjamin ULg; Pierard, Sébastien ULg; Braham, Marc ULg et al

in New Trends in Image Analysis and Processing - ICIAP 2015 Workshops (2015, September)

The estimation of the background image from a video sequence is necessary in some applications. Computing the median for each pixel over time is effective, but it fails when the background is visible for ... [more ▼]

The estimation of the background image from a video sequence is necessary in some applications. Computing the median for each pixel over time is effective, but it fails when the background is visible for less than half of the time. In this paper, we propose a new method leveraging the segmentation performed by a background subtraction algorithm, which reduces the set of color candidates, for each pixel, before the median is applied. Our method is simple and fully generic as any background subtraction algorithm can be used. While recent background subtraction algorithms are excellent in detecting moving objects, our experiments show that the frame difference algorithm is a technique that compare advantageously to more advanced ones. Finally, we present the background images obtained on the SBI dataset, which appear to be almost perfect. The source code of our method can be downloaded at http://www.ulg.ac.be/telecom/research/sbg . [less ▲]

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See detailCell-based description of ventricular contraction in a model of the human cardiovascular system
Kosta, Sarah ULg; Negroni, Jorge; Lascano, Elena et al

in Preprints of the 9th IFAC Symposium on Biological and Medical Systems (2015, September)

A multiscale model of the cardiovascular system (CVS) is presented. Hemodynamics is described by a lumped parameter model, while heart contraction is described at the cellular scale. An ... [more ▼]

A multiscale model of the cardiovascular system (CVS) is presented. Hemodynamics is described by a lumped parameter model, while heart contraction is described at the cellular scale. An electrophysiological model and a mechanical model were coupled and adjusted so that the pressure and volume of both ventricles are linked to the force and length of a half-sarcomere. Particular attention was paid to the extremal values of the sarcomere length, which must keep physiological values. This model is able to reproduce healthy behavior, preload variations experiments, and ventricular failure. [less ▲]

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See detailNon-adiabatic study of the Kepler subgiant KIC 6442183
Grosjean, Mathieu ULg; Dupret, Marc-Antoine ULg; Belkacem, Kevin et al

in The Space Photometry Revolution CoRoT Symposium 3, Kepler KASC-7 joint meeting (2015, September)

Thanks to the precision of Kepler observations, [3] were able to measure the linewidth and amplitude of individual modes (including mixed modes) in several sub- giant power spectra. We perform a forward ... [more ▼]

Thanks to the precision of Kepler observations, [3] were able to measure the linewidth and amplitude of individual modes (including mixed modes) in several sub- giant power spectra. We perform a forward modelling of a Kepler subgiant based on sur- face properties and observed frequencies. Non-adiabatic computations including a time- dependent treatment of convection give the lifetimes of radial and non-radial modes. Next, combining the lifetimes and inertias with a stochastic excitation model gives the ampli- tudes of the modes. We can now directly compare theoretical and observed linewidths and amplitudes of mixed-modes to obtain new constraints on our theoretical models. [less ▲]

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See detailEfficacité à long terme d’une infiltration de plasma riche en plaquettes pour traiter une tendinopathie patellaire proximale
Kaux, Jean-François ULg; Honoré, Morgan; Evrard, Frédéric

in 8ème Congrès Commun SFMES - SFTS (2015, September)

Introduction: Les tendinopathies sont des pathologies d’hyper-utilisation très fréquentes, tant chez des sujets sportifs ou non-sportifs. Leur incidence est actuellement en augmentation. La tendinopathie ... [more ▼]

Introduction: Les tendinopathies sont des pathologies d’hyper-utilisation très fréquentes, tant chez des sujets sportifs ou non-sportifs. Leur incidence est actuellement en augmentation. La tendinopathie patellaire proximale est une des tendinopathies les plus réfractaires au traitement conservateur et peut affecter la qualité de vie en limitant les activités sportives qu'elles soient récréationnelles ou professionnelles. Objectifs : L’objectif de cette étude est d’évaluer les effets à long terme du PRP pour traiter les tendinopathies patellaires proximales et éventuellement d’en identifier des facteurs de bon pronostic. Matériel et méthodes: 25 tendinopathies patellaires proximales ont été traités par PRP et ont été suivie à plus d’un an (dont 9 sujets sont suivi jusque 48 mois post-infiltration). Les patients sont évalués selon les questionnaires VISA-P, IKDC et un questionnaire reprenant leurs habitudes. Les scores VISA-P et IKDC sont croisés avec le troisième questionnaire afin d’obtenir des moyennes en rapport avec les réponses de ce dernier. Résultats : Aucun patient n’a été traité par chirurgie après l’infiltration. L’évolution des patients a tendance à être toujours positive jusqu’à 48 mois. Les facteurs semblant être bénéfiques sur l’évolution des patients sont : l’activité sportive à une fréquence de six à huit heures de sport par semaine, la réalisation d’exercices excentriques à domicile, une hydratation de plus d’un litre et demi par jour, un échauffement de plus de dix minutes ainsi que l’âge des patients (<30 ans). Conclusion : Le traitement d’une tendinopathie patellaire proximale par infiltration de PRP est efficace à long terme (jusque 4 ans). La réalisation d’exercices excentriques réguliers semble nécessaire et permet d’observer la poursuite de l’amélioration clinique des patients. [less ▲]

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See detailLocal Treatment for Monochrome Outdoor Painted Metal Sculptures: Assessing the suitability of conservation paints for retouching
van Basten, Nikki; Defeyt, Catherine ULg; Rivenc, Rachel

in Conservation of Sculpture Parks (2015, September)

When outdoor painted sculptures get chipped, scratched or abraded, conservators might consider local retouching treatments as an option that would protect the exposed metal substrate and restore the ... [more ▼]

When outdoor painted sculptures get chipped, scratched or abraded, conservators might consider local retouching treatments as an option that would protect the exposed metal substrate and restore the aesthetic integrity, thus postponing a very costly and invasive overall repainting. Unfortunately, matching colour gloss and texture on large monochrome surfaces is always challenging. This paper reports on research undertaken to investigate some of the materials and application techniques that could be used to improve the matching of local areas of inpainting as part of a broader maintenance strategy for painted works in sculpture parks, and discusses some of the advantages and disadvantages of working with both industrial products and conservation materials. Previous work by the lead author investigated the use of industrial paints to retouch monochrome painted metal sculptures, using Claes Oldenburg’s Trowel (1971) from the Kröller-Müller Museum as a case study. Several industrial products were tested and for Trowel it was found that using a paint of the same type as the original, manipulated to modify its gloss and colour, gave the best results. However, the original paint is not always available on the market because of product discontinuation or paint formulations changing over the years, and so research on alternative products was carried out at the Getty Conservation Institute. Instead of investigating industrial paint systems, a range of conservation paints and products that are usually employed in indoor applications were tested. Although these materials are unlikely to match the durability of industrial products in outdoor settings, they offer a number of advantages that might make them appropriate for temporary treatments, including a better workability for colour and gloss adjustments, a generally easier application procedure, better availability in small quantities, and a lower cost than their industrial counterparts. For the present study, a matte industrial paint that was recently developed as a coating for Alexander Calder sculptures was used as the target surface. Various conservation retouching paints were selected and used to retouch mock-ups prepared with these matte industrial paints, which were damaged with scratches and other mechanical means to reproduce typical damage to painted sculpture. The simulated scratches and losses were first primed and filled using materials that were selected in consultation with conservators and the paint industry. Since the composition of some of these products was unclear they were analysed and determined. The retouching was then carried out as a last step, applying the paint with an airbrush and using an ‘over-the-edge spray technique’. Some of the retouching paints were modified following the advice of the manufacturer to improve workability or durability. The colour retention of the various products is currently being tested with artificial aging in a weatherometer; the adhesion of the local treatment and the compatibility with the overall paint will be tested with the mock-ups placed outdoors for an extended period of time. Preliminary results show that the workability of some of the products tested is satisfying and that the retouching, when carried out properly, reintegrates both the paint coherence and the visual aspect of the artwork. [less ▲]

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See detailRelation entre hygiène bucco-dentaire et tendinopathies chez les sportifs
Kipgen, Laurence; Kaux, Jean-François ULg; Rompen, Eric ULg et al

in 8ème Congrès Commun SFMES - SFTS (2015, September)

Intoduction : De nos jours, la majorité des patients consultent un dentiste pour des problèmes dentaires stricto senso et fort peu pour des pathologies liées au parodonte. Ce dernier est pourtant leur ... [more ▼]

Intoduction : De nos jours, la majorité des patients consultent un dentiste pour des problèmes dentaires stricto senso et fort peu pour des pathologies liées au parodonte. Ce dernier est pourtant leur structure d’ancrage permettant le maintien des dents et donc de l’appareil manducateur. La présence d’un saignement gingival au brossage quotidien, étant la plupart du temps non douloureux, ne déclenche souvent aucune inquiétude ni demande de consultation. Il s'agit pourtant d'un des signes cliniques les plus évidents des parodontopathies qui affectent, à des degrés divers, pratiquement 90% de la population en France dans toutes les tranches d'âge et cause la perte de 30 à 40% des dents. Objectif : Le parodonte représente un des points fragiles de notre corps permettant facilement l’entrée de bactéries dans la circulation sanguine et expliquant une relation entre la maladie parodontale et certaines maladies systémiques. Qu’en est-t-il des tendinopathies? Cette étude a pour objectif de mettre en évidence les relations entre l’hygiène bucco-dentaire et ses répercussions sur les tendinopathies. Matériel & méthode : Soixante-quatre sportifs réguliers ont participé à un examen parodontal complet au cours duquel les paramètres cliniques suivants ont été enregistrés: indices de plaque (PI), indice gingival (GI) et indice de saignement papillaire (PBI). Les athlètes ont été répartis en trois groupes en fonction de leur état de santé : « athlètes non blessés » (ANB), « athlètes blessés » (AB) et « athlètes régulièrement blessés » (ARB). Résultats : En comparant les groupes ANB et AB on remarque une différence significative entre les trois valeurs enregistrées (IP : p=0.023 ; IG : p<0.0001 ; PBI : p<0.0001). Le groupe ARB ne montre pas de différences significatives avec les deux autre groupes. Discussion et Conclusion : Notre étude montre une relation entre les parodontopathies et les tendinopathies mais le modèle ne permet pas à déterminer l’origine ni l’importance de cette relation. Il est recommandé aux athlètes de prêter suffisaient attention à leur hygiène de vie générale et de ne pas négliger leur hygiène dentaire. [less ▲]

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See detailMass sensor utilising the mode-localisation effect in an electrostatically-coupled MEMS resonator pair fabricated using an SOI process
Wood, Graham; Chun, Zhao; Pu, Suan et al

in Proceedings 41st Micro and Nano Engineering Conference (2015, September)

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See detailX-LAG : une nouvelle cause de gigantisme
Beckers, Albert ULg

in Abstract book - Annales d'Endocrinologie - 32ème Congrès de la Société Française d'Endocrinologie (2015, September)

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See detailRelationship between Stroke Volume and Pulse Wave Velocity
Kamoi, Shun; Pretty, Christopher; Chiew, Yeong Shiong et al

in Preprints of the 9th IFAC Symposium on Biological and Medical Systems (2015, September)

Stroke Volume (SV) measurements are essential for evaluating patient hemodynamic status and response to therapy. However, current methods for monitoring SV require either invasive or non- invasive ... [more ▼]

Stroke Volume (SV) measurements are essential for evaluating patient hemodynamic status and response to therapy. However, current methods for monitoring SV require either invasive or non- invasive additional measurements. This study investigates the relationship between SV and Pulse Wave Velocity (PWV) to examine whether the value of PWV can capture the changes in SV. The analysis was performed using data from six porcine experiments (N=6 Pietrain Pigs, 20-29 kg) in which left ventricular volume, aortic arc pressure, and descending aortic pressure waveforms were measured simultaneously. From the measured data, correlation coefficients were determined between absolute value of aortic PWV, SV and trend value ‘PWV – mean PWV’, ‘SV – mean SV’ during periods when changes in SV were induced from preload changes, as well as infusion of dobutamine. The results showed good correlation (r = 0.59) for trend value, however, the correlation coefficient were poor with r = 0.028 for absolute value across all pigs. The analysis showed that value of PWV is reliable for capturing trend value of SV in preload changes. However, it is unreliable for capturing absolute value of SV or changes in SV made from dobutamine. [less ▲]

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See detailRELY – short term scientific missions
Schmitz, Serge ULg

in Abstracts. Energy Landscapes: Perception, Planning, Participation and Power. European Conference of the Landscape Research Group, Dresden, 16‐18 September 2015 (2015, September)

The COST Action TU1401 ‘Renewable Energy and Landscape Quality’ ('RELY') encourages Short Term Scientific Missions (STSMs). This Action investigates “the inter‐relationships between renewable energy ... [more ▼]

The COST Action TU1401 ‘Renewable Energy and Landscape Quality’ ('RELY') encourages Short Term Scientific Missions (STSMs). This Action investigates “the inter‐relationships between renewable energy production and landscape quality, and the role of public participation for the acceptance of renewable energy systems”. STSMs are exchange visits from five working days until three months that are aiming to strengthen the existing networks by allowing individual scientists to go to an institution or laboratory in other COST country to foster collaboration and contribute to the scientific objectives of the COST Action. Each year of the COST Action TU1401, there are up to six STSMs to be awarded. The financial support is a contribution to the costs of a STSM. A grant (maximum 2500€ depending on the duration of the stay) covers travel and subsistence. We invite researchers, especially early stage researchers, to participate in a STSM. The selection of STSM applicants is based on the scientific scope of the STSM application that must be in line with the Cost Action TU1401 objectives. This short communication aims to inform of the next calls and presents the result of the 2015 call. [less ▲]

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See detailStudy of ingredients and chemical composition of snacks for dogs
Ricci, Rebecca; Morelli, G.; Fusi, Eleonora et al

in Priymenko, Nathalie; Janssens, Geert; Harris, Patricia (Eds.) Congress Proceedings of the 19th ESVCN Congress (2015, September)

Snacks (n=41) for dogs showed a wide variability in chemical composition; most of them were composed by numerous ingredients, often identified as categories, among which simple sugars and sweeteners.

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See detailLocal Treatment for Monochrome Outdoor Painted Metal Sculptures: Assessing the suitability of conservation paints for retouching
van Basten, Nikki; Defeyt, Catherine ULg; Rivenc, Rachel

in Conservation of Sculpture Parks (2015, September)

When outdoor painted sculptures get chipped, scratched or abraded, conservators might consider local retouching treatments as an option that would protect the exposed metal substrate and restore the ... [more ▼]

When outdoor painted sculptures get chipped, scratched or abraded, conservators might consider local retouching treatments as an option that would protect the exposed metal substrate and restore the aesthetic integrity, thus postponing a very costly and invasive overall repainting. Unfortunately, matching colour gloss and texture on large monochrome surfaces is always challenging. This paper reports on research undertaken to investigate some of the materials and application techniques that could be used to improve the matching of local areas of inpainting as part of a broader maintenance strategy for painted works in sculpture parks, and discusses some of the advantages and disadvantages of working with both industrial products and conservation materials. Previous work by the lead author investigated the use of industrial paints to retouch monochrome painted metal sculptures, using Claes Oldenburg’s Trowel (1971) from the Kröller-Müller Museum as a case study. Several industrial products were tested and for Trowel it was found that using a paint of the same type as the original, manipulated to modify its gloss and colour, gave the best results. However, the original paint is not always available on the market because of product discontinuation or paint formulations changing over the years, and so research on alternative products was carried out at the Getty Conservation Institute. Instead of investigating industrial paint systems, a range of conservation paints and products that are usually employed in indoor applications were tested. Although these materials are unlikely to match the durability of industrial products in outdoor settings, they offer a number of advantages that might make them appropriate for temporary treatments, including a better workability for colour and gloss adjustments, a generally easier application procedure, better availability in small quantities, and a lower cost than their industrial counterparts. For the present study, a matte industrial paint that was recently developed as a coating for Alexander Calder sculptures was used as the target surface. Various conservation retouching paints were selected and used to retouch mock-ups prepared with these matte industrial paints, which were damaged with scratches and other mechanical means to reproduce typical damage to painted sculpture. The simulated scratches and losses were first primed and filled using materials that were selected in consultation with conservators and the paint industry. Since the composition of some of these products was unclear they were analysed and determined. The retouching was then carried out as a last step, applying the paint with an airbrush and using an ‘over-the-edge spray technique’. Some of the retouching paints were modified following the advice of the manufacturer to improve workability or durability. The colour retention of the various products is currently being tested with artificial aging in a weatherometer; the adhesion of the local treatment and the compatibility with the overall paint will be tested with the mock-ups placed outdoors for an extended period of time. Preliminary results show that the workability of some of the products tested is satisfying and that the retouching, when carried out properly, reintegrates both the paint coherence and the visual aspect of the artwork. [less ▲]

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See detailValidation and test cases for a free surface SPH model
Goffin, Louis ULg; Erpicum, Sébastien ULg; Dewals, Benjamin ULg et al

in Advances in hydroinformatics - Simhydro 2014 (2015, September)

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See detailProspects of a new dynamic simulation software for real-time applications on the Hydro-Québec system
Aristidou, Petros ULg; Lebeau, Simon; Loud, Lester et al

in 2015 CIGRÉ Canada Conference proceedings (2015, September)

Hydro-Québec has a long interest in on-line Dynamic Security Assessment (DSA) driven by its challenging power network dynamics (angle, frequency and voltage stability, short and long-term dynamics). At ... [more ▼]

Hydro-Québec has a long interest in on-line Dynamic Security Assessment (DSA) driven by its challenging power network dynamics (angle, frequency and voltage stability, short and long-term dynamics). At the moment, off-line calculated security indicators are combined with an on-line monitoring system to ensure the security of the system. However, new developments in power system dynamic simulation algorithms facilitate real-time or near-real-time DSA calculations and enable on-line transfer limits determination. In this paper, the domain-decomposition-based algorithm implemented in the dynamic simulator RAMSES is presented, along with the techniques used to accelerate both its sequential and parallel execution. RAMSES exploits the localized response of power systems to disturbances and the timescale decomposition of dynamic phenomena to provide sequential acceleration when the simulation is performed on a single processing unit. In addition, when more computational units are available, the parallelization potential of domain-decomposition methods is exploited to provide parallel acceleration. The presented algorithm and techniques are tested on a realistic model of the Hydro-Québec system and the accuracy of dynamic response, the sequential and parallel performances are evaluated. Finally, the real-time capabilities of the simulator are assessed using a shared-memory parallel processing platform. [less ▲]

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See detailIntegrated multi sensor system for parallel in-situ monitoring of cell nutrients, metabolites and cell mass in biothechnological processes
Mross, S; Zimmerman, T; Winkin, N et al

in Proc. Eurosensors, CS02-1 (2015, September)

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See detailGalland épigraphiste et philologue classique
Famerie, Etienne ULg

in Bauden, Frédéric; Waller, Richard (Eds.) Actes du Colloque "Antoine Galland (1646-1715) : orientaliste, antiquaire, numismate, humaniste" (2015, September)

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See detailTHE SILURO – DEVONIAN SUCCESSIONS IN THE TASSILI N'AJJER OUTCROPS (SE, ALGERIA): SEDIMENTOLOGY AND STRATIGRAPHY
Djouder, Hocine ULg; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in IGCP 596 - SDS SYMPOSIUM : Climate change and Biodiversity patterns in the Mid-Palaeozoic (2015, September)

The sedimentary basins of North Africa have been accumulated a thick sedimentary succession of Palaeozoic, especially Siluro – Devonian sediments. These successions have been deposited in wide sags and ... [more ▼]

The sedimentary basins of North Africa have been accumulated a thick sedimentary succession of Palaeozoic, especially Siluro – Devonian sediments. These successions have been deposited in wide sags and sub-basins in a cratonic setting, along the northwestern passive margin of the Gondwana. This sedimentation is mainly controlled by rapid eustatic sea-level variations and by the opening of the proto-Tethyan Ocean during the Early Palaeozoic (Beuf et al., 1971; Boot et al., 1998). During this Siluro-Devonian Period, a high subsidence occurred, allowing a high pile of sediments and organic-rich shales were deposited in many places that form important hydrocarbon reservoirs and source rocks throughout North Africa basins and Middle East (Lüning et al., 2000). In the prolific Illizi and Berkine basins (Western Ghadames, Algeria) a basin-wide approach is needed, especially with the new “shale gas and shale oil” frontier in the upcoming years, in order to capture regional trends and re-assessment the Siluro-Devonian successions. Our project focuses on the Berkine Basin and its margin, which covers nearly 102.000 km2. This basin includes a thick sedimentary series of 7000 m corresponding to complex reservoirs but also black shales of the basal Silurian and Frasnian, which are respectively major and secondary source rock systems. Complete logging of spectacular large-scale and well exposed outcrops of the Siluro-Devonian sediments was carried out at the south margin (SE, Tassili n’Ajjer) of the Illizi-Berkine basins (Djouder et al., 2012; Djouder et al., 2014). The following analysis incorporates biostratigraphic, ichnological, sedimentological, Magnetic susceptibility (MS) and high resolution stratigraphic data. It would allow providing a framework of deposits, ranging from offshore to deltaic deposits for the Silurian and from fluvial to normal-marine depositional conditions for the Devonian. References Cited: Beuf, S., Biju-Duval, B., De Charpal, O., Rognon, P., Gariel, O., Bennacef, A., 1971. Les Grès du Paléozoïque inférieur au Sahara : Sédimentation et Discontinuité, Évolution Structurale d’un Craton. Publication de l‘Institut Français du Pétrole. N° 18, Edition Technip, Paris. p. 464. Boote, D.R.D., Clark-Lowes, D.D., Traut, M.W., 1998. Palaeozoic petroleum systems of North Africa. In: Macgregor, D.S., Moo- dy, R.T.J., Clark-Lowes, D.D. (Eds.), Petroleum Geology of North Africa. Geol. Soc. London Sp. Publ., vol. 132, pp. 7–68. Lüning, S., Craig, J., Loydell, D.K., Štorch, P., Fitches, B., 2000. Lower Silurian ‘hot shales’ in North Africa and Arabia: regional distribution and depositional model. Earth-Science Reviews, vol. 49, pp. 121-200. Djouder, H., Pagel, M., Murat, B., Orsingher, M., 2012. Le Silurien du Bassin de Berkine. Projet « Shale Gas » Profond. 10éme Colloque du Groupe Français des Argiles, Présentation Orale, Limoge, France 14-18 Mai 2012. http://hdl.handle.net/2268/171556 Djouder, H., Boulvain, F., Da Silva, A-C., Cornet, P., Lüning, S., 2014. Tassili n’Ajjer (Sahara Oriental Algérien) – Résultats préliminaires sur le Silurien – Dévonien : Journée Thématique de l’Association des Sédimentologistes Français (ASF) – Diagenèse : avancées récentes et perspectives, Présentation Poster, Orsay-Paris, France 04 Juillet 2014. http://hdl.handle.net/2268/171557 [less ▲]

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See detailChanges in biting characteristics recorded using the inertial measurement unit of a smartphone reflect differences in sward attributes
Andriamandroso, Andriamasinoro ULg; Lebeau, Frédéric ULg; Bindelle, Jérôme ULg

in Guarino, Marcella; Berckmans, Daniel (Eds.) Precision Livestock Farming '15 (2015, September)

Accurate monitoring of grazing activity at individual cow level would provide useful information to farmers to improve the management of their animals and pastures in intensive dairy systems. Pasture ... [more ▼]

Accurate monitoring of grazing activity at individual cow level would provide useful information to farmers to improve the management of their animals and pastures in intensive dairy systems. Pasture attributes, starting with sward height, influence grazing behaviour and bites characteristics. In an attempt to link sward height to an individual automated detection of biting behaviour, a series of recording sessions of 4×3 days were realized on a ryegrass pasture with two contrasting heights (5 and 15 cm) over the grazing season (from July to October) with 4 dry red-pied cows equipped with the inertial measurement unit (IMU) of a smartphone on a halter, recording acceleration data at 100Hz. The behaviours were video-recorded. The number of grazing bouts performed during grazing trends to increase when the grass is highest. Fourier transforms of acceleration data showed that grazing bouts were characterized by a distinctive acceleration peak which frequency ranged between 1.02Hz and 1.46Hz whatever the sward height. It corresponded to the uprooting of grass frequency in the biting movement when compared with the observation in the video recordings and it could be used to improve automated grazing behaviour detection and to remotely characterize bites. These results show that some bite characteristics are influenced by sward height and automated individual monitoring of grazing behaviour is possible. An extension of this methodology should allow analysing more deeply the grazing behaviour of cattle in order to determine number of bites and possibly to link it to biomass intake. [less ▲]

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See detailNonlinear Background Filter to Improve Pedestrian Detection
Wang, Yi; Pierard, Sébastien ULg; Su, Song-Zhi et al

in New Trends in Image Analysis and Processing - ICIAP 2015 Workshops (2015, September)

In this paper, we propose a simple nonlinear filter which improves the detection of pedestrians walking in a video. We do so by first cumulating temporal gradient of moving objects into a motion history ... [more ▼]

In this paper, we propose a simple nonlinear filter which improves the detection of pedestrians walking in a video. We do so by first cumulating temporal gradient of moving objects into a motion history image (MHI). Then we apply to each frame of the video a motion-guided nonlinear filter whose goal is to smudge out background details while leaving untouched foreground moving objects. The resulting blurry-background image is then fed to a pedestrian detector. Experiments reveal that for a given miss rate, our motion-guided nonlinear filter can decrease the number of false positives per image (FPPI) by a factor of up to 26. Our method is simple, computationally light, and can be applied on a variety of videos to improve the performances of almost any kind of pedestrian detectors. [less ▲]

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See detailA perfect estimation of a background image does not lead to a perfect background subtraction: analysis of the upper bound on the performance
Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

in International Conference on Image Analysis and Processing (ICIAP) (2015, September)

The quest for the “best” background subtraction technique is ongoing. Despite that a considerable effort has been undertaken to develop flexible and efficient methods, some elementary questions are still ... [more ▼]

The quest for the “best” background subtraction technique is ongoing. Despite that a considerable effort has been undertaken to develop flexible and efficient methods, some elementary questions are still unanswered. One of them is the existence of an intrinsic upper bound to the performance. In fact, data are affected by noise, and therefore it is illusory to believe that it is possible to achieve a perfect segmentation. This paper aims at exploring some intrinsic limitations of the principle of background subtraction. The purpose consists in studying the impact of several limiting factors separately. One of our conclusions is that even if an algorithm would be able to calculate a perfect background image, it is not sufficient to achieve a perfect segmentation with background subtraction, due to other intrinsic limitations. [less ▲]

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See detailSurvey on the attitude of dogs' owners on the use of snacks
Ricci, Rebecca; Morelli, Giada; Fusi, Eleonora et al

in Priymenko, Nathalie; Janssens, Geert; Harris, Patricia (Eds.) Congress Proceedings of the 19th ESVCN congress (2015, September)

Results of a study of 2217 dog's owners about the use of snacks.

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See detailERT monitoring sheds light on the hydrogeological behavior in a landfill
Dumont, Gaël ULg; Nguyen, Frédéric ULg

in EarthDoc - Near Surface Geoscience 2013 – 21th European Meeting of Environmental and Engineering Geophysics (2015, September)

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See detailStellar acoustic radii and ages from seismic inversion techniques
Buldgen, Gaël ULg; Dupret, Marc-Antoine ULg; Reese, Daniel Roy et al

in The Space Photometry Revolution CoRoT Symposium 3, Kepler KASC-7 joint meeting (2015, September)

Determining stellar characteristics such as the radius, mass or age is crucial and asteroseismology is currently the most promising tool to provide these results accurately. We extend the SOLA inversion ... [more ▼]

Determining stellar characteristics such as the radius, mass or age is crucial and asteroseismology is currently the most promising tool to provide these results accurately. We extend the SOLA inversion technique to new global characteristics in addition to the mean density (see Reese et al. 2012) and apply our methodology to the acoustic radius and an age indicator based on the sound speed derivative. The results from SOLA inversions are compared with estimates based on the small and large frequency separations for several test cases.We show that SOLA inversions yield more accurate results than other techniques which are more sensitive to surface effects. [less ▲]

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See detailModel refinements of transformers via a subproblem finite element method
Dular, Patrick ULg; Kuo-Peng, Patrick; Ferreira da Luz, Mauricio et al

in Proceedings of ISEF 2015 (2015, September)

A progressive modeling of transformers is performed via a subproblem finite element method. A complete problem is split into subproblems with different adapted overlapping meshes. Model refinements are ... [more ▼]

A progressive modeling of transformers is performed via a subproblem finite element method. A complete problem is split into subproblems with different adapted overlapping meshes. Model refinements are performed from ideal to real flux tubes, 1-D to 2-D to 3-D models, linear to nonlinear materials, perfect to real materials, single wire to volume conductor windings, and homogenized to fine models of cores and coils, with any coupling of these changes. The proposed unified procedure efficiently feeds each subproblem via interface conditions, which lightens mesh-to-mesh sources transfers, and quantifies the gain given by each refinement on both local fields and global quantities. [less ▲]

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See detailChallenging land fragmentation thanks a mobile milking robot: Statement of 2 cases of implementation: Liège and Trevarez experimental farms
Brocard, Valérie; Dufrasne, Isabelle ULg; Lessire, Françoise ULg et al

in Conington, J; Klopcic, M; Lauridsen, C (Eds.) et al Book of abstracts of the 66th annual meeting of the European Federation of Animal Science (2015, September)

Cette présentation fait le point de l'expérience de l'utilisation de 2 robots mobiles, développés comme prototypes à la Ferme expérimentale de Trévarez et à l'Université de Liège

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See detailChanging public viewpoints on wind energy development in Belgium
Vanderheyden, Vincent ULg; Schmitz, Serge ULg

in Abstracts. Energy Landscapes: Perception, Planning, Participation and Power. European Conference of the Landscape Research Group, Dresden, 16‐18 September 2015 (2015, September)

The amount of wind turbines has increased exponentially in Belgium in the last eight years (175 in 2007, 771 in 2015). During this period, especially in the last two years, critics of this energy have ... [more ▼]

The amount of wind turbines has increased exponentially in Belgium in the last eight years (175 in 2007, 771 in 2015). During this period, especially in the last two years, critics of this energy have become more organised, virulent, and active in delaying or stopping many projects. The landscape impact of wind energy is central to their arguments. We wonder if people’s attitudes towards wind turbines and landscape changed in the last years in Belgium and how they changed. This paper compares public perception of wind energy in two researches about landscape perception. The two studies used slightly different methodologies but with similarities in the designs, allowing some comparisons. The first research (2007‐2009) aimed to study the perceived landscape impact and the social acceptance of wind turbines in Belgium. 1542 Belgians were surveyed about their landscape preferences using a photo‐questionnaire, including some pictures with wind turbines. 75 stakeholders of wind energy projects were also interviewed. The second research (2012‐2014) aimed to examine deeper the landscape preferences among 54 residents in three areas in Wallonia where wind turbines are present, using the previous photographs. During the conduct of the first research, changing attitudes were already observed. People had become more familiar with wind turbines and were less reluctant. The symbolic positive aspect of wind energy was highlighted seven years ago. This view continues. However, people seem more categorical in their viewpoint. All respondents have now been confronted to wind energy, which was not the case seven years ago. Some persons are not against wind farms but their increase in number start to overwhelm them. Others point they get used to the turbines, as long as they are not too many and too close. The huge increase in wind farms in the last seven years has changed the acceptance of wind energy. Some doubts about the real efficiency of this energy also shaped the attitudes. [less ▲]

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See detailReview of existing solutions and presentation of a simplified method for the crashworthiness of lock gates
Buldgen, Loïc ULg; Ehlers, Sören; Le Sourne, Hervé et al

in Proceedings of the Smart Rivers 2015 Conference (2015, September)

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See detailA feasibility study for a self-oscillating loop for a three degree of freedom coupled MEMS resonator force sensor
Zhao, C; Wood, GS; Pu, SH et al

in Proc. Eurosensors MP-L01 (2015, September)

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See detailEffect and profitability of storage facilities within zonal pricing systems
Oprescu, Bogdan; Quoilin, Sylvain ULg; Zucker, Andreas

in Proceedings of the 10th Conference on Sustainable Development of Energy, Water and Environment Systems (2015, September)

The new European Objectives along with environmental concerns are leading the energy sector in a new phase where conventional generation plants are progressively replaced by renewable energy sources. This ... [more ▼]

The new European Objectives along with environmental concerns are leading the energy sector in a new phase where conventional generation plants are progressively replaced by renewable energy sources. This new paradigm raises concerns regarding the optimal generation mix and the management of the power transmission constraints. This study focuses on the case of Italy tosimulate the dispatch in its power system with DispaSET, a unit commitment and optimal dispatch model developed within the Joint Research Centre. It aims at evaluating the value of storage and of interconnections in different renewables penetration scenarios. [less ▲]

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See detailEstimation of Airline Itinerary Choice Models Using Disaggregate Ticket Data
Lurkin, Virginie ULg; Garrow, Laurie A.; Higgins, Matthew J. et al

in 55th AGIFORS Annual Proceedings 2015 (2015, August 29)

Airline itinerary choice models support many multi-million dollar decisions, i.e., they are used to evaluate potential route schedules. Classic models suffer from major limitations, most notably they use ... [more ▼]

Airline itinerary choice models support many multi-million dollar decisions, i.e., they are used to evaluate potential route schedules. Classic models suffer from major limitations, most notably they use average fare information but to not correct for price endogeneity. We use a novel database of airline tickets to estimate itinerary choice models using detailed fare data and compare these to classic itinerary choice models that use aggregate fare information but correct for price endogeneity. [less ▲]

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See detailThe optical blocking filter for the ATHENA wide field imager: ongoing activities towards the conceptual design
Barbera, M.; Branduardi-Raymont, G.; Collura, A. et al

in Siegmund, Oswald H. (Ed.) UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX (2015, August 01)

ATHENA is the L2 mission selected by ESA to pursue the science theme "Hot and Energetic Universe" (launch scheduled in 2028). One of the key instruments of ATHENA is the Wide Field Imager (WFI) which will ... [more ▼]

ATHENA is the L2 mission selected by ESA to pursue the science theme "Hot and Energetic Universe" (launch scheduled in 2028). One of the key instruments of ATHENA is the Wide Field Imager (WFI) which will provide imaging in the 0.1-15 keV band over a 40'x40' large field of view, together with spectrally and time-resolved photon counting. The WFI camera, based on arrays of DEPFET active pixel sensors, is also sensitive to UV/Vis photons. Optically generated electron-hole pairs may degrade the spectral resolution as well as change the energy scale by introducing a signal offset. For this reason, the use of an X-ray transparent optical blocking filter is needed to allow the observation of all type of X-ray sources that present a UV/Visible bright counterpart. In this paper, we describe the main activities that we are carrying on for the conceptual design of the optical blocking filter, that will be mounted on the filter wheel, in order to satisfy the scientific requirements on optical load from bright UV/Vis astrophysical source, to maximize the X-ray transmission, and to withstand the severe acoustic and vibration loads foreseen during launch. [less ▲]

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See detailGenetic heritage of the Eastern Belgium Red and White breed, an endangered local breed
Colinet, Frédéric ULg; Bouffioux, Aude; Mayeres, Patrick et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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See detailPotential of visible-near infrared spectroscopy for the characterization of butter properties
Troch, Thibault ULg; Baeten, Vincent; Dehareng, Frédéric et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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See detailOverview of possibilities and challenges of the use of infrared spectrometry in cattle breeding
Gengler, Nicolas ULg; Soyeurt, Hélène ULg; Dehareng, Frédéric et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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See detailBifurcation analysis of a spacecraft structure using the harmonic balance method
Detroux, Thibaut ULg; Renson, Ludovic ULg; Masset, Luc ULg et al

in Proceedings of the ASME 2015 International Design Engineering Technical Conferences (2015, August)

The harmonic balance (HB) method has been widely used in the past few years, as a numerical tool for the study of nonlinear models. However, in its classical formulation the HB method is limited to the ... [more ▼]

The harmonic balance (HB) method has been widely used in the past few years, as a numerical tool for the study of nonlinear models. However, in its classical formulation the HB method is limited to the approximation of periodic solutions. The present paper proposes to extend the method to the detection and tracking of bifurcations in the codimension-2 system parameters space. To validate the methodology, the forced response of a real spacecraft is examined. The paper first provides some numerical evidence of the presence of quasiperiodic oscillations and isolated solutions. It then demonstrates how the tracking of Neimark-Sacker and fold bifurcations can help get a deeper understanding of these attractors. [less ▲]

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See detailGenetic analysis to support the re-establishment of the Kempen breed
François, Liesbeth; Janssens, Steven; Colinet, Frédéric ULg et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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See detailTime-averaged phase-stepped ESPI with CO2 laser and shearography in the visible for identification of vibration mode shapes
Vandenrijt, Jean-François ULg; Thizy, Cédric ULg; Georges, Marc ULg

in Mendoza Santoyo, Fernando (Ed.) SPECKLE 2015: VI International Conference on Speckle Metrology (2015, August)

We present investigation of interferometric methods for vibration mode identification to be applied on shakers in industrial environment. We consider long wave infrared ESPI in time-averaged mode with the ... [more ▼]

We present investigation of interferometric methods for vibration mode identification to be applied on shakers in industrial environment. We consider long wave infrared ESPI in time-averaged mode with the use of phase-stepping which allows transforming Bessel fringes, typical to the time averaging, into phase values which provide a better way for identification of vibration mode shapes. The use of long laser wavelength allows measuring larger amplitudes of vibrations compared to what is achieved in visible light. Also longer wavelengths allow lower sensitivity to external perturbations. Time-averaged phase-stepped shearography in visible is also used as a compared alternative to LWIR ESPI for working in industrial environments. Although not demonstrated here, an interesting feature for the future investigations on LWIR ESPI is its potentiality of simultaneous temperature measurement during vibrations [less ▲]

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See detailBrain Trains: Intermodal Rail Freight Transport and Hinterland Connections - A Swot Analysis to Assess the Belgian Rail Practice
Troch, Frank; Vanelslander, Thierry; Sys, Christa et al

in Proceedings of the IAME Annual Conference 2015 (2015, August)

This paper focuses on transversal research of the role and influences of rail freight transport, as a part of intermodal transport in Belgium. The scope of the research concentrates on port hinterland ... [more ▼]

This paper focuses on transversal research of the role and influences of rail freight transport, as a part of intermodal transport in Belgium. The scope of the research concentrates on port hinterland flows. A large SWOT analysis of the current situation is conducted, starting from the actual weak usage of this mode of transport. Five different fields have been identified, impacting the economy and society. Each field indicates critical internal strengths and weaknesses for intermodal rail transportation in Belgium, and identifies possible future developments and setbacks. A Delphi-like approach is used, including a heterogeneous panel of experts discussing and validating the SWOT results. To prioritize the characteristics, a survey on the different SWOT elements was performed, asking the experts to rate each statement on its influence and likelihood of happening (level of uncertainty). [less ▲]

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See detailStroke Volume Estimation using Aortic Pressure Measurements and Aortic Cross Sectional Area: Proof of Concept
Kamoi, Shun; Pretty, Christopher G.; Chiew, Yeong Shiong et al

in Proceedings of the 37th International Conference of the IEEE Engineering in Medicine and Biology Society (2015, August)

Accurate Stroke Volume (SV) monitoring is essential for patient with cardiovascular dysfunction patients. However, direct SV measurements are not clinically feasible due to the highly invasive nature of ... [more ▼]

Accurate Stroke Volume (SV) monitoring is essential for patient with cardiovascular dysfunction patients. However, direct SV measurements are not clinically feasible due to the highly invasive nature of measurement devices. Current devices for indirect monitoring of SV are shown to be inaccurate during sudden hemodynamic changes. This paper presents a novel SV estimation using readily available aortic pressure measurements and aortic cross sectional area, using data from a porcine experiment where medical interventions such as fluid replacement, dobutamine infusions, and recruitment maneuvers induced SV changes in a pig with circulatory shock. Measurement of left ventricular volume, proximal aortic pressure, and descending aortic pressure waveforms were made simultaneously during the experiment. From measured data, proximal aortic pressure was separated into reservoir and excess pressures. Beat-to-beat aortic characteristic impedance values were calculated using both aortic pressure measurements and an estimate of the aortic cross sectional area. SV was estimated using the calculated aortic characteristic impedance and excess component of the proximal aorta. The median difference between directly measured SV and estimated SV was -1.4ml with 95% limit of agreement +/- 6.6ml. This method demonstrates that SV can be accurately captured beat-to-beat during sudden changes in hemodynamic state. This novel SV estimation could enable improved cardiac and circulatory treatment in the critical care environment by titrating treatment to the effect on SV. [less ▲]

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See detailLes précédents. La bataille de Ravenna
Dumont, Jonathan ULg

in Viganò, Marino (Ed.) Marignano 1515 : la svolta. Atti del congresso internazionale, Milano, 13 settembre 2014 (2015, August)

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See detailCombination of temporal phase unwrapping and long-wave infrared digital holographic interferometry for metrology of mosaic detector under space simulated conditions
Vandenrijt, Jean-François ULg; Thizy, Cédric ULg; Beaumont, Florent et al

in Mendoza Santoyo, Fernando (Ed.) SPECKLE 2015: VI International Conference on Speckle Metrology (2015, August)

We present digital holographic interferometry (DHI) in the long-wave infrared for monitoring the deformation under cryogenic conditions of a segmented focal plane array to be used in a space mission. The ... [more ▼]

We present digital holographic interferometry (DHI) in the long-wave infrared for monitoring the deformation under cryogenic conditions of a segmented focal plane array to be used in a space mission. The long wavelength was chosen for its ability to allow measurement of displacements 20 times larger than DHI in the visible and which were foreseen with the test object under such temperature changes. The specimen consists of 4x4 mosaic of detectors assembled on a frame. It was required to assess the global deformation of the ensemble, the deformation of each detector, and piston movements of each of them with respect to their neighbors. For that reason we incorporated the temporal phase unwrapping by capturing a sufficiently high number of holograms between which the phase does not suffer strong variations. At last since the specimen exhibit specular reflectivity at that wavelength, it is illuminated through a reflective diffuser [less ▲]

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See detailModelling of the Nonlinear End-Systolic Pressure-Volume Relation and Volume-at-Zero-Pressure in Porcine Experiments
Davidson, Shaun M.; Kannangara, D. Oliver; Pretty, Christopher G. et al

in Proceedings of the 37th International Conference of the IEEE Engineering in Medicine and Biology Society (2015, August)

The End-Systolic Pressure-Volume Relation (ESPVR) is generally modelled as a linear relationship between P and V as cardiac reflexes, such as the baroreflex, are typically suppressed in experiments ... [more ▼]

The End-Systolic Pressure-Volume Relation (ESPVR) is generally modelled as a linear relationship between P and V as cardiac reflexes, such as the baroreflex, are typically suppressed in experiments. However, ESPVR has been observed to behave in a curvilinear fashion when cardiac reflexes are not supressed, suggesting the curvilinear function may be more clinically appropriate. Data was gathered from 41 vena cava occlusion manoeuvres performed experimentally at a variety of PEEPs across 6 porcine specimens, and ESPVR determined for each pig. An exponential model of ESPVR was found to provide a higher correlation coefficient than a linear model in 6 out of 7 cases, and a lower Akaike Information Criterion (AIC) value in all cases. Further, the exponential ESPVR provided positive V0 values in a physiological range in6 out of 7 cases analysed, while the linear ESPVR produced positive V0 values in only 3 out of 7 cases, suggesting linear extrapolation of ESPVR to determine V0 may be flawed. [less ▲]

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See detailGenetic variability of MIR predicted milk technological properties in Walloon dairy cattle
Colinet, Frédéric ULg; Troch, Thibault ULg; Baeten, Vincent et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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See detailCritical metals in sphalerites from Belgian MVT deposits
Goffin, Vincent; Evrard, Maxime ULg; Pirard, Eric ULg

in André-Mayer, Anne-Sylvie; Cathelineau, Michel; Muchez, Philippe (Eds.) et al Proceedings of the 13th SGA Biennial Meeting (2015, August)

Belgium hosts a series of well documented low temperature, carbonate hosted, lead-zinc veins and lenses clearly categorized as MVT deposits. This paper revisits the distribution of trace elements in ... [more ▼]

Belgium hosts a series of well documented low temperature, carbonate hosted, lead-zinc veins and lenses clearly categorized as MVT deposits. This paper revisits the distribution of trace elements in sphalerites from Belgian deposits with a special focus on Ge, Ga and In. By comparing with a database of worldwide deposits, this paper shows that Belgian sphalerites do not display a classical substitution pattern involving Cu+. Instead, multivariate analysis points towards similarities with the Tres Marias deposit in Mexico, although the explanation of coupled substitution with Fe++ does not seem to apply in the present case. From the limited set of sphalerites analysed in this paper, the following rithmetic means are obtained: m(Ge) = 302 ppm, m(Ga) = 2.2 ppm and m(In) < 0.06 ppm. These average values should not hide the fact that a wide variability does exist from one deposit to the other and within zoned colloform sphalerites of the same deposit. Further nd systematic work is required to better evaluate the resource and understand the mechanisms responsible for Ge incorporation into sphalerite. [less ▲]

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See detailPhysical modeling of lateral dike breaching due to overtopping
Rifai, Ismail ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in River, Coastal and Estuarine Morphodynamics, RCEM 2015 (2015, August)

Dikes are commonly used as defense structures for river flow channelization, protecting population and property from floods and against lateral riverbed migration. However, the aging of these structures ... [more ▼]

Dikes are commonly used as defense structures for river flow channelization, protecting population and property from floods and against lateral riverbed migration. However, the aging of these structures, combined with their increased vulnerability to extreme hydrological events may cause the dikes to breach, and subsequently to break. Furthermore, statistics show that flow overtopping is the main cause of dike failure, which emphasizes the need to understand thoroughly the process of breaching. Indeed, from a risk management perspective it is particularly important to have a detailed understanding of the mechanisms (e.g. internal erosion, overtopping erosion) underlying the formation of breaches due to overtopping and reliable information on flows passing through them. Conversely, the current knowledge of breaching mechanisms remains fragmented, especially because dike failure involves complex interactions between flows, materials of the structure, soil and foundations. The existing studies have addressed partially these interactions as the considered idealized dikes were generally homogenous, the piping erosion unaccounted for and the overtopping replicated in a dam-break like configuration. Yet, river embankments are subjected to high flow velocities parallel to the direction of the dike and to flow in the floodplain, which highly influence the shape of the breach and its evolution. The objective of the present work is to fill this gap. A laboratory experimental investigation is planned in the National Laboratory for Hydraulics and Environment (LNHE) of EDF R&D (France) and in the research group Hydraulics in Environmental and Civil Engineering (HECE) of the University of Liege (Belgium), reproducing realistic configurations of river dikes, accounting for the tangential flow in both main channel and floodplain. It enables thus the assessment of, on the one hand, the effect of the increase of the water level, and on the other hand, the influence of waves. The laboratory tests also consider the effect of a surface layer and composition of the dike core by testing different material mixtures. Geometry and composition of the idealized dikes are representative of typical field dikes, based on the similarity theory. [less ▲]

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See detailIsolated response curves in a base-excited, two-degree-of-freedom, nonlinear system
Noël, Jean-Philippe ULg; Detroux, Thibaut ULg; Masset, Luc ULg et al

in Proceedings of the ASME 2015 International Design Engineering Technical Conferences (2015, August)

In the present paper, isolated response curves in a nonlinear system consisting of two masses sliding on a horizontal guide are examined. Transverse springs are attached to one mass to provide the ... [more ▼]

In the present paper, isolated response curves in a nonlinear system consisting of two masses sliding on a horizontal guide are examined. Transverse springs are attached to one mass to provide the nonlinear restoring force, and a harmonic motion of the complete system is imposed by prescribing the displacement of their supports. Numerical simulations are carried out to study the conditions of existence of isolated solutions, their bifurcations, their merging with the main response branch and their basins of attraction. This is achieved using tools including nonlinear normal modes, energy balance, harmonic balance-based continuation and bifurcation tracking, and global analysis. [less ▲]

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See detailAgriculture Seen Through the Prism of the French Media in Belgium
Dubois, Charline ULg

in Firmino, Ana (Ed.) Smart answers for a smiling future (2015, August)

Scholars agree on the importance of the farming activities to maintain the quality (aesthetic environment) of rural areas. The number of farmers in Belgium fall steadily in the recent decades (Van Hecke ... [more ▼]

Scholars agree on the importance of the farming activities to maintain the quality (aesthetic environment) of rural areas. The number of farmers in Belgium fall steadily in the recent decades (Van Hecke et al. 2010). In particular, the rural systems of Wallonia transformed, characterized by the increased presence of landscapes of consumption and the influx of urban migrants. Why do they live in the countryside? Do they know the farmers in the area? What are the rural idylls (Yarwood 2005)? The answers to these questions lead to the understanding of perceptions and recognitions of rural spaces among different stakeholders. On another scale, this leads to the need for the improvement of social and territorial cohesion to improve the quality of life and the integration of people into their new living environment. The topics about “to live and to build the countryside” are current (Cawley & Gillmor 2008, Frelat-Kahn & Lazzarotti 2012) and are also concerned with the future of the countryside, of farming, and of the vitality of rural systems that face challenges according to geographic situations. With increasing suburbanization and multifunctionality (Bills & Gross 2005), some inhabitants want to build an interdependent community with authentic values. But the inhabitants’ representations about rural way of life are inexistent (despite some local initiatives such as organic produces) or complex (Dubois & Schmitz 2011, Tencati & Zsolnai 2012). Each person can say that he/she lives in the countryside by considering different space realities, with the risk that farmers could become strangers (Simard & Guimond 2013)! “Each year we organised a party in our street with everybody from the surrounding areas. Some farmers come and it is amazing to socialize more than just pass each other by cars and tractors” (inhabitant in a rural town in Wallonia). This study presents a first step in exploring inhabitant’s representations of the countryside. We analyse here the organic image about agriculture developed by the media that partly influences the people's perception of agriculture. Other than the induced and experienced images, organic image or “those that arise from supposedly unbiased sources” such as books, school education, television, documentaries, newspapers, and word of mouth (Gunn 1972, O'Leary & Deegan 2005) is considered. “People are interested about agricultural features. We speak a lot about that in the media, so people would like to know more about us and our job! That is why they visit us and they are sometimes so disoriented!” (Farmer in Wallonia). The analysis focuses on 3 consecutive even-numbered years: 2010, 2012 and 2014, from January to December. The national online press platform was used to access the articles. This allows for an analytical look at how agriculture is represented in the newspapers: What themes were addressed? How often? And to know the level of importance, in which part of the newspapers did it appear? The study analysed articles from 2 Belgian French newspapers from different media groups (Le Soir, La Libre). Different regions were covered to take into account different agro-geographical landscapes, suburban and rural features of the countryside, and different social and economical realities of Wallonia. For each article, topic selection and content analysis (NVivo ) were undertaken. Bette (2012) made the first analysis of the topic in 2012 and put into evidence 13 different categories in which agriculture has been presented: organic, diversification, legislation, economy, crops, farming, food, biotechnology, energy, animal health, plant diseases, environment, other. However, for this research, we improved the typology and add other topics such as the tourism, the local produces, the (agro-) geographical regions. Qualitative analysis showed that economic difficulties, economic investment, local produces, slow food, European policies, environment are among the categories frequently explored. All the different categories were represented and were often sensationalised but the level of importance is not high as most news were often found inside the newspaper and not on the front page. These different elements influence the representations of the different readers and give an overview about the influence of images of agriculture on the inhabitants. Agriculture is related to multiple components but some of these aspects are not presented and remain unknown to the common public. A lot of other questions about agricultural and rural systems and agricultural regions are not covered because on-going social, economic environmental and cultural trends tend to influence the information that are found in the newspapers. Agriculture is often simplified in a positive (e.g. local products, organic farming) and in a negative way (e.g. pollutions, bankruptcies, suicides) which implied that it is difficult for laymen to have a valid representation based on newspapers. [less ▲]

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See detailOn the use of novel milk phenotypes as predictors of difficult-to-record traits in breeding programs
Bastin, Catherine ULg; Colinet, Frédéric ULg; Dehareng, Frédéric et al

in Book of Abstracts of the 66th Annual Meeting of the European Federation of Animal Science (2015, August)

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

in André-mayer, anne-Sylvie; Cathelineau, Michel; Muchez, Philippe (Eds.) et al Mineral resources in a sustainable worl, proceeding, volume 5 (2015, August)

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See detailComparison between thermographic and holographic techniques for nondestructive testing of composites: similarities, differences and potential cross-fertilization
Georges, Marc ULg

in Mendoza Santoyo, Fernando (Ed.) SPECKLE 2015: VI International Conference on Speckle Metrology (2015, August)

Thermography and different variants of holography (holographic interferometry, speckle interferometry, shearography) are full-field non-contact techniques which are used in nondestructive testing ... [more ▼]

Thermography and different variants of holography (holographic interferometry, speckle interferometry, shearography) are full-field non-contact techniques which are used in nondestructive testing applications. In particular they are attractive for damage detection in composite materials compared to other methods measuring in one point and which require scanning and contact with the samples, like ultrasounds. Currently thermography is a step forward compared to holographic techniques for this application. Indeed it is easier to interpret. Many thermography configurations and variants exist, from exciting sources to post-processing. Such a variety exists also among the holographic techniques but to a less extent. We will see how these techniques can share some aspects and what distinguish them. Also the complementarity of both will be addressed and how to combine them. At last we will discuss how processing developed for thermography can benefit to holography and vice-versa, specifically in the domain of composite materials. [less ▲]

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See detailEthnic Differences in Travel Time Expenditure
Cools, Mario ULg; Eftekhar, Hamed ULg

in Proceeding of the 14th International Conference on Travel Behaviour Reresearch (IATBR 2015) (2015, July 23)

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See detailA viscoelastic-viscoplastic-damage constitutive model based on a large strain hyperelastic formulation for amorphous glassy polymers
Nguyen, Van Dung ULg; Morelle, Xavier; Lani, Frédéric et al

in proceedings of the 20th International Conference on Composite Materials, Copenhagen, Denmark, 19-24th July 2015 (2015, July 20)

The aim of this work is to develop an efficient large-strain hyperelastic constitutive model for amorphous polymers in the glassy state. These materials exhibit a complex rate- and pressure-sensible ... [more ▼]

The aim of this work is to develop an efficient large-strain hyperelastic constitutive model for amorphous polymers in the glassy state. These materials exhibit a complex rate- and pressure-sensible behavior in both elastic and plastic regimes. After an initial linear elastic region, a nonlinear stage continues until reaching a peak stress, which is followed by a softening stage. At large strains, when the softening is saturated, a re-hardening stage is reached. The viscoelastic effect is captured using the generalized Maxwell model. The viscoplastic effect is considered using a Perzyna-type flow rule incorporating a pressure sensitive yield surface and a non-associated flow potential. This yield surface is extended from the Drucker-Prager one. The saturated softening phenomenon is modelled using an isotropic numerical damage variable progressed by a saturated softening law. With the introduction of the damage parameter, a non-local implicit gradient damage model is used to avoid the loss of the solution uniqueness. Through experimental comparisons, it is shown that the proposed model has the ability to model the complex mechanical responses of amorphous glassy polymers. [less ▲]

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See detailExperimental study of Predictive Control strategies for optimal operation of Organic Rankine Cycle systems
Hernandez Naranjo, Jairo Andres ULg; Desideri, Adriano ULg; Ionescu, Clara et al

in Experimental study of Predictive Control strategies for optimal operation of Organic Rankine Cycle systems (2015, July 17)

In this paper the performance of Model Predictive Control (MPC) and PID based strategies to optimally recover waste heat using Organic Rankine Cycle (ORC) technology is investigated. First the ... [more ▼]

In this paper the performance of Model Predictive Control (MPC) and PID based strategies to optimally recover waste heat using Organic Rankine Cycle (ORC) technology is investigated. First the relationship between the evaporating temperature and the output power is experimentally evaluated, concluding that for some given heat source conditions there exists an optimal evaporating temperature which maximizes the energy production. Three different control strategies MPC and PID based are developed in order not only to maximize energy production but to ensure safety conditions in the machine. For the case of the MPC, the Extended Prediction Self-Adaptive Control (EPSAC) algorithm is considered in this study as it uses input/output models for prediction, avoiding the need of state estimators, making of it a suitable tool for industrial applications. The experimental results obtained on a 11kWe pilot plant show that the constrained EPSAC-MPC outperforms PID based strategies, as it allows to accurately regulate the evaporating temperature with a lower control effort while keeping the superheating in a safer operating range. [less ▲]

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See detailCrop supplemental irrigation experiences in Burkina Faso
Zongo, Bétéo ULg; Diarra, Abdoulaye; Barbier, Bruno et al

in Field, Christopher; Jouzel, Jean; Le Treut, Hervé (Eds.) Our ender common climate future change, Abstract Book (2015, July 10)

This study assesses the impact of supplemental irrigation from small man-made basins on cereal production in climate variability and change context marked by dry spells in the Sahelian zone of Burkina ... [more ▼]

This study assesses the impact of supplemental irrigation from small man-made basins on cereal production in climate variability and change context marked by dry spells in the Sahelian zone of Burkina Faso. After two years, the experiments showed that this innovation in family farms increases maize yield and allows growing a second crop with the surplus of water available in the basin. At the end of the 2012-2013 campaign, the average maize yield was estimated 2.5 t/ha on experimental plots (EP) and 1.7 t/ha on control plots (CP). The average yield of the 2013-2014 campaign was evaluated as 3.3 T/ha and 0.9 t/ha for EP and CP respectively. Increase in yield is 0.8 t/ha for the 2012-2013 campaign and 2.4 t/ha during 2013-2014. It appears as well as the yield obtained on EP in 2012-2013 and 2013-2014 for bridging cereal need of 2 and 6 additional persons respectively in agricultural households compared to the CP. The review of the Net present value, Internal rate of return and the Net benefits increase ratio show that the profitability to practice supplemental irrigation depends on the types of basins. [less ▲]

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See detailModelling Uncertainties in Long-Term Predictions of Urban Growth: A Coupled Cellular Automata and Agent-Based Approach
El Saeid Mustafa, Ahmed Mohamed ULg; Saadi, Ismaïl ULg; Cools, Mario ULg et al

in Ferreira, Joseph; Goodspeed, Robert (Eds.) Proceedings of CUPUM 2015 (2015, July 07)

Modelling the growth of urban settlements is of considerable interest for different applications, amongst which integrated flood management. This study aims at modelling urban growth for a long time ... [more ▼]

Modelling the growth of urban settlements is of considerable interest for different applications, amongst which integrated flood management. This study aims at modelling urban growth for a long time horizon up to 2100 and to integrate the model outcomes with a hydrological model for the same time horizon. Forecasting land-use change over such time frames entails very significant uncertainties. In this regard, the main focus of this paper is attributed to the handling of uncertainty in an urban growth model. To this end, we examine a Monte Carlo Simulation method, which is integrated in the proposed urban growth model. Transition probabilities for each non-urban cell are estimated by a coupled Cellular Automata-Agent-Based ap-proach. The results help to handle uncertainty over long time horizons and to assess the increment in degree of uncertainty at every time-step. [less ▲]

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See detailContribution du bilan de masse de surface antarctique à l’évolution du niveau des mers avec le modèle atmosphérique régional MAR
Agosta, Cécile ULg; Fettweis, Xavier ULg; Gallée, Hubert

in Actes du 28e colloque de l’Association Internationale de Climatologie (2015, July 02)

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See detailSuppression of simulated self-excited oscillation using smart materials on flexible wing structure
Abdul Razak, N.; Nasip, N. S.; Hawari, A. F. et al

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015 (2015, July 01)

Suppression of simulated self-excited oscillation due to aeroelastic effects using piezoelectric patches is reported. The focus of the present work is suppressing simulated flutter oscillation using ... [more ▼]

Suppression of simulated self-excited oscillation due to aeroelastic effects using piezoelectric patches is reported. The focus of the present work is suppressing simulated flutter oscillation using piezoelectric patches bonded to the wing structure. First, a clean wing is exposed to airflow in the wind tunnel where it experienced limited amplitude oscillation. The responses were recorded. This is followed by bonding piezoelectric patches to the identical wing that was tested in the wind tunnel. Two of the patches were used as actuators to simulate self-excited oscillation in a control manner. The selected mode for excitation is 1st bending mode. The other two patches were used as suppressor for active control using negative velocity feedback Single-Input, Single-Output approach. The single input signal for negative feedback is also sensed using piezoelectric patches. The controller manages to suppress the simulated flutter response to a lower oscillation amplitude values. This works demonstrated the used of piezoelectric material as actuator to reproduce the oscillation amplitude during self-excited oscillation and suppress the oscillation at the same time. [less ▲]

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See detailGaz à effet de serre indirects et qualité de l'air aux latitudes moyennes de l'hémisphère nord : tendances à long terme et variabilité déduites de télémesures effectuées au Jungfraujoch (Alpes suisses, 3580 m)
Franco, Bruno ULg; Bader, Whitney ULg; Lejeune, Bernard ULg et al

in Erpicum, Michel (Ed.) Actes du XXVIIIe colloque annuel de l’Association Internationale de Climatologie : Modélisations et variabilités (2015, July 01)

Indirect greenhouse gases and air quality at Northern Hemisphere mid-latitudes: long-term trends and variability derived from ground-based remote sensing at Jungfraujoch (Swiss Alps, 3580 m a.s.l.). We ... [more ▼]

Indirect greenhouse gases and air quality at Northern Hemisphere mid-latitudes: long-term trends and variability derived from ground-based remote sensing at Jungfraujoch (Swiss Alps, 3580 m a.s.l.). We present an overview of recent investigations conducted by the Solar and Atmospheric Physics Infrared Group at the University of Liège and dedicated to the long-term monitoring of atmospheric gases with an indirect greenhouse effect and affecting air quality at Northern Hemisphere mid-latitudes. Gas concentrations are derived from high-resolution solar spectra recorded at the Jungfraujoch station (Swiss Alps, 46.5° N, 8.0° E, 3580 m a.s.l.), using Fourier transform infrared spectrometers. Time series obtained from these observations, along with satellite measurements and simulations from numerical models, allow for the study of both variability and recent evolution of these species and are critical for air quality monitoring and understanding climate changes. [less ▲]

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See detailA new test of uniformity for object orientations in astronomy
Pelgrims, Vincent ULg

in Heavens, A. F.; Starck, J.-L.; Krone-Martins, A. (Eds.) Statistical Challenges in 21st Century Cosmology (2015, July 01)

We briefly present a new coordinate-invariant statistical test dedicated to the study of the orientations of transverse quantities of non-uniformly distributed sources on the celestial sphere. These ... [more ▼]

We briefly present a new coordinate-invariant statistical test dedicated to the study of the orientations of transverse quantities of non-uniformly distributed sources on the celestial sphere. These quantities can be projected spin-axes or polarization vectors of astronomical sources. [less ▲]

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See detailMaking "Place" count in Risk perception studies
Ocampo, Lou Angeli ULg; Schmitz, Serge ULg

in Firmino, Ana (Ed.) Book of Abstracts and Programme: 23rd Annual Colloquium on Sustainable Rural Systems: Smart Answers for a smiling future (2015, July)

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See detailTentatives de prétraitement des granulats recyclés pour l’amélioration des bétons préfabriqués
Zhao, Zengfeng ULg; Courard, Luc ULg; Remond, Sébastien et al

in Ciments, bétons et fibres - Matériaux et structures (2015, July)

De très grandes quantités de déchets de construction et de démolition sont produites chaque année. Jusqu'à présent, seule une petite fraction de ces déchets de béton est réutilisée sous forme de granulats ... [more ▼]

De très grandes quantités de déchets de construction et de démolition sont produites chaque année. Jusqu'à présent, seule une petite fraction de ces déchets de béton est réutilisée sous forme de granulats pour la fabrication de béton. Afin de faire bon usage des granulats recyclés (GR) dans le béton, il est très important d’améliorer leurs propriétés. Dans cette étude, une méthode de traitement des GR au moyen d’une carbonatation accélérée en laboratoire et des méthodes de traitement par modification de l’état de surface des GR ont été étudiées. Les résultats montrent qu'après la carbonatation accélérée au laboratoire, la teneur en pâte de ciment durcie des GR mesurée par dissolution de l'acide salicylique diminue, que la densité et la surface spécifique des GR augmentent et que la porosité des GR diminue, ce qui conduit à la réduction de l'absorption d'eau des GR. Des agents hydrofuges à base de silane ont également été étudiés et semblent diminuer l’absorption d’eau par les GR. [less ▲]

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See detailEtude de l'évolution de l'enneigement dans les Hautes Fagnes (Belgique) au cours des cinquante dernières années à l'aide du modèle climatique régional MAR
Wyard, Coraline ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

in Erpicum, Michel (Ed.) Actes du XXVIIIe colloque annuel de l’Association Internationale de Climatologie : Modélisations et variabilités (2015, July)

The “Modèle Atmosphérique Régionale” MAR is a regional climate model originally developed to study the polar ice sheets. In this study, the MAR model has been adapted to Belgium in order to study the snow ... [more ▼]

The “Modèle Atmosphérique Régionale” MAR is a regional climate model originally developed to study the polar ice sheets. In this study, the MAR model has been adapted to Belgium in order to study the snow cover evolution of the High Fens (east of Belgium), a region covered by snow on average one to two months per year. As validation, we have sucessfully compared MAR based daily snow heights with snowcam-based and/or laser sensor-based observations over the period 2008-2013. Then, the model has been forced by ERA-Interim since 1958 to study the snow cover evolution during the last fifty years at the summit of Belgium. The results show no significant trend despite global warming. [less ▲]

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