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See detailComparison between analytical and optimal control techniques in the differential drag based rendez-vous
Dell'Elce, Lamberto ULg; Kerschen, Gaëtan ULg

in Proceedings of the 5th International Conference on Spacecraft Formation Flying Missions & Technologies (2013, May 29)

The focus of this study is on differential drag for propellantless satellite rendez-vous. This technique is particularly attractive for low-Earth-orbit small satellites for which stringent weight ... [more ▼]

The focus of this study is on differential drag for propellantless satellite rendez-vous. This technique is particularly attractive for low-Earth-orbit small satellites for which stringent weight constraints apply. Most existing contributions are based on bang-bang strategies, which may be difficult to implement in practice. This is why the present paper proposes a novel strategy integrating pseudospectral optimal control for maneuver planning and model predictive control for dealing with uncertainties and unmodeled dynamics. One important advantage of this methodology is that it can naturally account for attitude dynamics and constraints, which, in turn, paves the way for the practical realization of differential drag-based rendez-vous. A realistic scenario involving two nanosatellites of the QB50 constellation is considered to illustrate and validate the proposed developments. In addition, a comparison of this numerical technique with an existing analytic solution is carried out, and their respective pros and cons are discussed. [less ▲]

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See detailThe Solar Sail Material (SSM) Project : Results of Activities
Dalla Vedova, Florio; de Wilde, Don; Semprimoschnig, Christopher et al

in The Third International Symposium on Solar Sailing: Book of abstracts (2013, May 28)

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See detailPsychosocial needs and perception of inequity: How spouses react to the cancer of their partner?
Wagener, Aurélie ULg; Bragard, Isabelle ULg; Jonius, Bénédicte et al

in 2013 BAPS Annual Meeting : Conference booklet (2013, May 28)

Background. Several studies have highlighted the importance of psychosocial needs in cancer patients’ spouses. Our study’s aim was to reduce these spouses’ needs, using a combination of two ... [more ▼]

Background. Several studies have highlighted the importance of psychosocial needs in cancer patients’ spouses. Our study’s aim was to reduce these spouses’ needs, using a combination of two psychotherapeutic methods: 1. Psychosocial needs’ organization into a hierarchy; 2. Problem-solving method. We also assessed perception of inequity, which is a new concept used in psycho-oncology. This perception focusses on two feelings that spouses might experience in their relationships: firstly, the feeling of overbenefit and underinvestment; secondly, the feeling of underbenefit and overinvestment. Method. A longitudinal design with three assessments (T0,T1,T2) and two groups (experimental, control) was employed. Spouses fulfilled questionnaires: socio-demographic questionnaire, Psychosocial Needs Inventory, Perception of Inequity, Hospital Anxiety and Depression Scale. At T0, all participants organised their psychosocial needs into a hierarchy. Experimental group practiced problem-solving method before control group. Indeed, experimental group practiced it between T0 and T1 while control group practiced it only between T1 and T2. Results. Thirty-seven spouses participated: N experimental group=19; N control group=18. Whenever the combination was given, repeated measures’ ANOVAs highlighted a significant decrease in unsatisfied psychosocial needs when participants have received both methods. Nevertheless, our results did not replicate previous findings according to which spouses experience a higher feeling of overinvestment and underbenefit than feeling of underinvestment and overbenefit. Discussion. Our results underline the interest of proposing psychotherapeutic methods to cancer patients’ spouses to reduce unsatisfied psychosocial needs: clinical implications will be further discussed. Moreover, perception of inequity is a significant concept in psycho-oncology which consequences will also be discussed. [less ▲]

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See detailCombination of actor’s play training and assertiveness program to reduce difficulties in self-affirmation: A preliminary study.
Wagener, Aurélie ULg; Delvaux, Muriel ULg; Sarto, Danielle et al

in 2013 BAPS Annual Meeting : Conference booklet (2013, May 28)

BACKGROUND. Difficulties in assertiveness are often reported by individuals suffering from various psychological problems involving anxiety, depression. Cognitive and behavioral therapeutic procedures ... [more ▼]

BACKGROUND. Difficulties in assertiveness are often reported by individuals suffering from various psychological problems involving anxiety, depression. Cognitive and behavioral therapeutic procedures have already proven their effectiveness in helping these patients. The aim of our study was to test the efficacy of new therapeutic procedure, inspired by the third wave of behavioral and cognitive psychotherapies. METHOD. Our study used an actor’s play training combined with an assertiveness program which comprised ten sessions: five of which were animated by an actress and five by a psychologist-psychotherapist. Each actor play’s session was given alternatively with a psychoeducation’s session. Twenty subjects participated in this program. They fulfilled these pre and post-test assessments: social self-efficacy questionnaire, self-affirmation scales, self-esteem scale, communication scale, anxiety and depression scales. Repeated measures’ ANOVAs have been used to compare pre and post-test results. RESULTS. Results showed statistically significant improvements on each dependent variable, except for the Communication Scale. The higher effects appeared for Beck Depression Inventory and Social Self-efficacy Questionnaire which presented an effect size of 0,74 and 0,56, respectively. Scores on STAI-A and B and on Self-affirmation Scale were over the effect size’s threshold. However, these improvements don’t attain control group’s scores reported in the scientific literature. DISCUSSION. The results highlighted that our program is effective in reducing difficulties in assertiveness. [less ▲]

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See detailIntegrated management of wild chamomile populations by tillage
Jaunard, Delphine ULg; Monty, Arnaud ULg; Mahy, Grégory ULg et al

in Agricultural and Apllied Biological Sciences (2013, May 21)

Gembloux, Belgium Chemical weeding in agriculture increasingly raises environmental, health and economic preoccupations. European authorities has set up legislations (directive 91/414, settlement 1107 ... [more ▼]

Gembloux, Belgium Chemical weeding in agriculture increasingly raises environmental, health and economic preoccupations. European authorities has set up legislations (directive 91/414, settlement 1107/2009, directive 2009/128) aiming to reduce risks related to the use of pesticides and encouraging integrated pest management. This situation leads professionals and scientists to take interest in the biology and population dynamics of weeds and to study the impacts of integrated pest management on weeds and crops. Tillage can potentially be an efficient weed control method in winter wheat (Triticum aestivum L.). We studied wild chamomile (Matricaria chamomilla L.) population dynamics and crop yields in an experimental winter wheat crop, in relation to tillage methods. Five modalities (i.e. different combinations of a stubble cultivator and/or a moldboard plow, including a no-tillage control) were applied during three years (2009-2012), with four replications, in Gembloux (Belgium). In each plot, M. chamomilla density was recorded throughout the seasons. In summer 2012, wild chamomile density was significantly lower in plots tilled with a moldboard plow. The use of a stubble cultivator did not significantly affect M. chamomilla density. In addition, we found higher wheat yields in ploughed plots, indicating that the decrease in M. chamomilla density reduced competition for wheat. To confirm these results, experiments are still under investigation in similar conditions. [less ▲]

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See detailFumigant toxicity of Mentha pulegium and Citrus aurantium essential oils to Tetranychus urticae (Acari: Tetranychidae) and Phytoseiulus persimilis (Acari: Phytoseiidae)
Attia, Sabrine; Grissa, K.L.; Lognay, Georges ULg et al

in Boeckx; Bossier, Peter; Smagghe, Guy (Eds.) et al Proceedings of the 65th international symposium on crop protection (2013, May 21)

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See detailComparison of parameterization schemes for solving the discrete material optimization problem of composite structures
Duysinx, Pierre ULg; Guillermo Alonso, Maria ULg; Tong, Gao et al

in Halftka, Raphael; KIM, Nam Ho (Eds.) Proceeding of the 10th World Congress on Structural And Multidisciplinary Optimization (2013, May 19)

Optimal design of composite structures can be formulated as an optimal selection of material in a list of different laminates. Based on the seminal work by Stegmann and Lund, the optimal problem can be ... [more ▼]

Optimal design of composite structures can be formulated as an optimal selection of material in a list of different laminates. Based on the seminal work by Stegmann and Lund, the optimal problem can be stated as a topology optimization problem with multiple materials. The research work carries out a large investigation of different interpolation and penalization schemes for the optimal material selection problem. Besides the classical Design Material Optimization (DMO) scheme and the recent Shape Function with Penalization (SFP) scheme by Bruyneel, the research introduces a generalization of the SFP approach using a bi-value coding parameterization (BCP) by Gao, Zhang and Duysinx. The paper provides a comparison of the different parameterization approaches. It also proposes alternative penalization schemes and it investigates the effect of the power penalization. Finally, we discuss the solution aspects in the perspective of solving large-scale industrial applications. The conclusions are illustrated by a numerical application for the compliance maximization of an in-plane composite ply. [less ▲]

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See detailA Lateral sensor for the alignment of two formation-flying satellites
Roose, Stéphane ULg; Stockman, Yvan ULg; Sodnik, Zoran

in Lehmann, Peter H.; Osten, Wolfgang; Albertazzi, Armando (Eds.) SPIE Proceedings Vol. 8788: (2013, May 15)

The lateral sensor is a system able to measure the lateral position between two satellites. It bridges the gap between the alignment accuracy achieved with the radio frequency metrology, and the alignment ... [more ▼]

The lateral sensor is a system able to measure the lateral position between two satellites. It bridges the gap between the alignment accuracy achieved with the radio frequency metrology, and the alignment accuracy required to start the high-precision optical metrology (fine-lateral and longitudinal sensor). This project concerns the demonstration of formation flying technologies for future European scientific and application missions of the EUROPEAN SPACE AGENCY. Technological developments enabling formation flying have already been initiated and some precursor missions already cover part of the related technologies, for example SMART-2. The lateral sensor developed at Centre Spatial de Liège (CSL) is based on a camera (CMOS detector) a telecentric lens designed at CSL, a fibre-coupled laser-diode bar and a corner cube. The fibre-coupled laser-diode bar emits a diverging beam, from the master spacecraft to a slave spacecraft. A corner cube located on the slave spacecraft sends the light back. This light is captured by the telecentric lens and camera (build by Deltatec Liège-B). A lateral shift “d” of the corner cube is seen on the camera as an image displacement. Real time centroidisation algorithms will allow tracking the image position and feed the on-board computer with this information via a RS422 link, allowing further position stabilisation. The imaging system needs to operate in a depth of field from 25 m to 250 m. Because of the large depth of operation, all lateral system performances are angular ones. The system is build to meet: • Tracking capability for a spot moving @ 0.5 arcdeg/sec • Spot detection with the sun in the field of view • Centroidisation accuracy: 0.1 camera pixels (3.5 arcsec) • Absolute calibration accuracy: 0.14 camera pixels (5 arcsec) In order to comply with these requirements, the following features were implemented : • The camera allows quick read-out of sub-windows of interest (in 1 ms). • Optimize radiometric budget and laser diode power consumption, and its related heat dissipation. • An interference filter blocks all unwanted light centred on the laser wavelength (980 nm). • The detector captures the images. An electronic unit records the images and localizes the bright spot (return image from the corner cube). • Implementation of a “slow detection mode”, which allows to discriminate sun from moving image The system is a standalone unit. Once connected to an unregulated 28V power-supply, it delivers, after spot detection, pixel coordinates to the RS422 link at a 10 Hz rate. Its average power consumption is 8W. The system can be put in a programming mode, to allow uploading settings in the FPGA. Tracking, absolute calibration, resolution and sun avoidance have been measured in a field of 10 arcdeg and the range of depth of 5 m to 80 m. The coarse lateral sensor has successfully undergone thermal qualification (40°C and -30 °C), and vibration test (high-level sinus, random and shock test in the 3–axis). Its metrology performances (centroidisation accuracy (<0.1 pixel RMS) and tracking) remained unchanged after these qualification tests. The absolute calibration is 0.3% in the interval of ±5arcdeg (11 arcsec in ±1arcdeg). [less ▲]

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See detailInnovative smart sensors to enhance eco-efficiency of a continuous (steel) production line
Saint-Mard, Michel; Stoukatch, Serguei ULg; Schischke, Karsten et al

in Proc. Conf. of the AMA Association for Sensor Technology (2013, May 15)

The paper aims to demonstrate the benefits for a global approach that allows to define new research directions, new potential industrial markets, and increasing interest from potential users. Combining ... [more ▼]

The paper aims to demonstrate the benefits for a global approach that allows to define new research directions, new potential industrial markets, and increasing interest from potential users. Combining performance, economic and environmental criteria in a joint assessment approach for the target applications of sensor systems, facilitates significantly the communication between service provider and user. The environmental assessment approach for sensor systems will be available as a beta-version online tool tentatively from July 2013 onwards. Interested SMEs are invited to get involved as the LCA to go consortium will provide also a comprehensive mentoring for SMEs [less ▲]

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See detailSynthesis of [18F]4-(4-fluorophenyl)-1,2,4-triazole-3,5-dione: an agent for specific radiolabelling of tyrosine.
Flagothier, Jessica ULg; Warnier, Corentin ULg; Lemaire, Christian ULg et al

in Flagothier, Jessica (Ed.) Journal of Labelled Compounds and Radiopharmaceuticals (2013, May 14)

Objectives: Metal-free and mild tyrosine modification reactions are an attractive alternative to the commonly used lysine and cysteine modification protocols for peptide and proteins labelling. Recently ... [more ▼]

Objectives: Metal-free and mild tyrosine modification reactions are an attractive alternative to the commonly used lysine and cysteine modification protocols for peptide and proteins labelling. Recently, Ban and co-workers have reported a tyrosine bioconjugation through ene-type reactions. Cyclic diazodicarboxamides, which are electrophilic compounds, react selectively in o-position on the phenol side chain of tyrosine in mild aqueous conditions and the 1,2,4-triazolidine-3,5-dione linkage is hydrolytically and thermally stable. We herein present the synthesis of [18F]4-(4-fluorophenyl)-1,2,4-triazole-3,5-dione and the coupling with N-acyl tyrosine methylamide. Methods: The N,N,N-trimethyl-4-nitrobenzeneammonium trifluoromethanesulfonate 1 was prepared following a procedure previously reported [2]. The [18F]prosthetic group 6, [18F]4-(4-fluorophenyl)-1,2,4-triazole-3,5-dione, was synthesized in five steps. Results: The synthesis of the [18F]prosthetic group has been realized with a decay-corrected radiochemical yield of 20% in 90 minutes. The radiochemical yield of the coupling with N-acyl tyrosine methylamide is 40% (DC). This presented synthetic pathway should be easily automated: particulary because the purifications between the different steps are exclusively done on SPE cartridges. Conclusions: We successfully developed an efficient bioconjugation method for fluorine-18 labelling of tyrosine without prior modifications of the peptide in very mild conditions. [less ▲]

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See detailCharacteristics of patients with pituitary gigantism : results of an international study
Rostomyan, Liliya ULg; Daly, Adrian ULg; Tichomirowa, M et al

in Endocrine abstracts - 15th European Congress of Endocrinology (2013, May)

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See detailThe prognostic value of preoperative FDG PET-CT in hepatocellular carcinoma treated by liver transplantation.
GOVAERTS, L.; DETRY, Olivier ULg; BLETARD, Noëlla ULg et al

in PROCEEDINGS OF THE XVIth SYMPOSIUM OF THE BELGIAN SOCIETY OF NUCLEAR MEDICINE (2013, May)

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See detailTracking of critical minerals/elements using multispectral quantitative analysis: the case of Chelopech (Bulgaria)
Evrard, Maxime ULg; Pirard, Eric ULg

in Fourth International Symposium: Mineral resources and Mine development (2013, May)

The Chelopech gold-copper mine is localized in the western part of Bulgaria and is one of the largest gold producer in Europe. The most of extracted copper in Chelopech Mining come from arseniate ... [more ▼]

The Chelopech gold-copper mine is localized in the western part of Bulgaria and is one of the largest gold producer in Europe. The most of extracted copper in Chelopech Mining come from arseniate sulfosalts (enargite and tennantite) but also sulphides such as bornite, chalcopyrite and covellite. Gold, silver and critical elements (Ge, Te and Se) are associated with this mineralization but only gold and silver are recovered. An image processing method is applied on different flotation plant samples: ore after milling, tailings 1; tailings 2, total tailings and concentrate. Polished sections made with these samples are analyzed in order to quantify the mineral amounts in each sample. The purpose of this quantitative analysis is to know the nature and proportions of mineral phases at each stage of the process. This study allow to know in which forms copper, arsenic and trace elements are present in the different samples and to track them during the different stages, which is very relevant information in order to improve ore treatment and tailings management. [less ▲]

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See detailPerspectives pour une transition durable des territoires périurbains.
Marique, Anne-Françoise ULg; Reiter, Sigrid ULg

in Journées Aperau : Aménager les métropoles. (2013, May)

L’article traite de la transition durable des territoires périurbains. Deux leviers d’action sont mobilisés à cette fin: (1) la forme urbaine et (2) la mobilité. Trois types de scénarios centrés sur une ... [more ▼]

L’article traite de la transition durable des territoires périurbains. Deux leviers d’action sont mobilisés à cette fin: (1) la forme urbaine et (2) la mobilité. Trois types de scénarios centrés sur une évolution du stock bâti existant sont modélisés et évalués (la rénovation énergétique, la densification et la démolition/reconstruction) de façon à répondre à deux questions : « comment intervenir dans les quartiers périurbains existants? » et « où intervenir? ». Ces simulations montrent que le renouvellement périurbain par densification des quartiers les mieux localisés permet de dépasser le clivage traditionnel entre les modèles de la « ville compacte » et de la « ville diffuse », en offrant de véritables opportunités pour la transition durable des territoires périurbains existants. Ces résultats théoriques, et appréhendés du seul point de vue énergétique, sont ensuite recadrés dans un contexte plus large pour mettre en évidence les opportunités, les limitations, les contraintes et la faisabilité de ces scénarios. [less ▲]

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See detailSelective Serotonin Reuptake Inhibitor and Fracture: an epidemiologic perspective
Bruyère, Olivier ULg

in Proceedings of the 8th Interantional Congress (GIO) (2013, May)

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See detailPlaisir, jeu et écriture dans la déconstruction derridienne
Steinmetz, Rudy ULg

in Les plaisirs et les jours (2013, May)

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See detailImportance of early nutritional support in very low birth weight infants
SENTERRE, Thibault ULg

in 5th International Clinical & Community Nutrition Conference (2013, May)

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See detailLessons from the Liege Acromegaly Survey (LAS)
PETROSSIANS, Patrick ULg; Zacharieva, Sabina; Chanson, Philippe et al

in Endocrine Abstracts - 15 the European Congress of Endocrinology (2013, May)

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See detailEffects of eccentric versus concentric training on mouse muscle phenotype
Hody, Stéphanie ULg; Lacrosse, Zoé ULg; Leprince, Pierre ULg et al

in Abstract Book of 10th Meeting of Belgian Society for Neuroscience (2013, May)

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See detailEfficient database pruning for large-scale cover song recognition
Osmalsky, Julien ULg; Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg et al

in International Conference on Acoustics, Speech, and Signal Processing (ICASSP) (2013, May)

This paper focuses on cover song recognition over a large dataset, potentially containing millions of songs. At this time, the problem of cover song recognition is still challenging and only few methods ... [more ▼]

This paper focuses on cover song recognition over a large dataset, potentially containing millions of songs. At this time, the problem of cover song recognition is still challenging and only few methods have been proposed on large scale databases. We present an efficient method for quickly extracting a small subset from a large database in which a correspondence to an audio query should be found. We make use of fast rejectors based on independent audio features. Our method mixes independent rejectors together to build composite ones. We evaluate our system with the Million Song Dataset and we present composite rejectors offering a good trade-off between the percentage of pruning and the percentage of loss. [less ▲]

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See detailLes clauses visant à prévenir les situations de blocage et régler les conflits entre actionnaires
Caprasse, Olivier ULg; Aydogdu, Roman ULg

in Les conventions d'actionnaires - Pratiques actuelles et contraintes juridiques (2013, May)

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See detail"Inspecter un corps mort" : contribution des rapports médicaux conservés sur papyrus (Ier – IVe siècles de notre ère) à l’histoire de la pratique médico-légale antique
Ricciardetto, Antonio ULg

in Charlier, Philippe; Gourevitch, Danielle (Eds.) 4e Colloque International de Pathographie (Saint Jean de Côle, 13-15 mai 2011) (2013, May)

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See detailShape optimization of periodic microstructures subject to stiffness and local stress constraints
Noël, Lise ULg; Van Miegroet, Laurent; Duysinx, Pierre ULg

in Proceedings of the 10th World Congress on Structural and Multidisciplinary Optimization: Orlanda (USA), 19-24 mai 2013 (2013, May)

As suggested by Sigmund, material tailoring can be formulated as a structural optimization problem. However microstructural geometries can be rather complex while optimization process may introduce large ... [more ▼]

As suggested by Sigmund, material tailoring can be formulated as a structural optimization problem. However microstructural geometries can be rather complex while optimization process may introduce large shape modifications of boundaries and material interfaces. To circumvent the technical difficulties of classical shape optimization relying on numerous and tedious CAD model manipulations and remesh- ing, the Level Set description combined with a non-conforming XFEM analysis is a promising approach. In the present work, this approach that has been developed in work by Van Miegroet is extended to the investigation of periodic microstructures subject to compliance or stress constraints. The approach is illustrated on the famous problem of the Vigdergauz microstructure. [less ▲]

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See detailImplementing sustainability strategies through accounting controls: An exploration of practices in seven multinational corporations
Crutzen, Nathalie ULg; Schaltegger, Stefan

in Proceedings of the 36th Annual Congress of the European Accounting Association (EAA) (2013, May)

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See detailMulti-scale aquifer characterization and groundwater flow model parameterization using direct push technologies
Rogiers, Bart; Vienken, T; Batelaan, Okke et al

in Novel Methods for Subsurface Characterization and Monitoring: From Theory to Practice (2013, May)

Groundwater flow and contaminant transport models are used to support decision making regarding waste disposal options, sites contaminated by surface or subsurface sources, or to develop and test cost ... [more ▼]

Groundwater flow and contaminant transport models are used to support decision making regarding waste disposal options, sites contaminated by surface or subsurface sources, or to develop and test cost-effective groundwater remediation schemes. Such models are influenced by different sources of uncertainty, including those due to spatial variability in aquifer and aquitard properties including hydraulic conductivity (K). However, quantifying spatial variability in K remains challenging. Classical drilling techniques for shallow heterogeneous unconsolidated sedimentary deposits involving continuous coring are expensive and time-consuming, especially when the area of interest exceeds several tens of km². Alternative techniques such as direct push technologies use hydraulic rams, supplemented with vehicle weight, or high-frequency hammering, to advance small-diameter tools into the subsurface. These tools are typically used for cost-effective geotechnical characterization of unconsolidated deposits; recent developments also allow for hydraulic characterization. The depth of investigation is up to ~40 m, depending on the tools used (i.e applied load) and sediment properties (friction). Up to now, only a limited number of studies document using this type of data to parameterize regional groundwater flow models. To fill this gap, this study aims at parameterizing a regional groundwater flow model using data from various types of direct push technologies. We discuss the characterization of an area (~60 km²) near the nuclear zone of Mol/Dessel (Belgium), using various direct push technologies. Most of the measurements are concentrated in an area of 200×400 m². The data include 265 cone penetration tests (CPTs), 113 pore pressure dissipation tests (PPDTs), 17 direct push injection logs (DPIL), 6 hydraulic profiling tool (HPT) logs and 19 direct push slug tests (DPST). Resulting K values, either calculated or estimated, and the corresponding spatial variability are compared with that of borehole and outcrop studies. The benefit of using standard CPT data for the parameterization of an aquitard at the study site has previously been shown. The approach is now applied to the aquifer units and incorporates new direct push data for the entire upper ~40 m of the hydrogeological domain. The effect of the 3D heterogeneous hydraulic conductivity field on the performance of the groundwater flow model is discussed; the value of the different direct push technologies is equally addressed. [less ▲]

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See detailSyndromes canalaires rares du membre supérieur - Apport des bilans électrophysiologiques
Kaux, Jean-François ULg; MASSART, Nicolas ULg; TINANT, France ULg et al

in 32ème Séminaire de Traumatologie du Sport de l'AMDTS (2013, May)

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See detailA nap to recap: Reward strengthens relational memory during daytime sleep
Igloi, Kinga; Gaggioni, Giulia Alice ULg; Eryilmaz, Hamdi et al

in Abstract book of the SSSSC annual meeting (2013, May)

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See detailA national survey on the prevalence and treatment outcome of active Cushing's disease in Belgium
Bex, M; Nauwelaerts, H; T'Sjoen, Guy et al

in Endocrine Abstracts - 15th European Congress of Endocrinology (2013, May)

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See detailA nap to recap: Reward strengthens relational memory during daytime sleep
Igloi, Kinga; Gaggioni, Giulia Alice ULg; Eryilmaz, Hamdi et al

in Abstract book of BBL/CIBM Research Day (2013, May)

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See detailFrequency-domain subspace identification of nonlinear mechanical systems
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the 5th International Operational Modal Analysis Conference (2013, May)

The objective of the present paper is to address the identification of a real-life strongly nonlinear space structure, the EADS-Astrium SmallSat spacecraft. To this end, a new nonlinear subspace ... [more ▼]

The objective of the present paper is to address the identification of a real-life strongly nonlinear space structure, the EADS-Astrium SmallSat spacecraft. To this end, a new nonlinear subspace identification method formulated in the frequency domain is exploited, referred to as the FNSI method. The frequency response functions of the underlying linear spacecraft and the amplitudes of the nonlinear internal forces are estimated based on a periodic-random data set corrupted by noise. This application is challenging for several reasons, including high modal density, highly non-proportional damping and the non-smooth nature of the nonlinearities. [less ▲]

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See detailFeeding the premature gut
SENTERRE, Thibault ULg

in 5th International Clinical & Community Nutrition Conference (2013, May)

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See detailReceptor expression in craniopharyngiomas causing tumor growth in pregnancy : case report and review of the literature
Tome, Monica; VROONEN, Laurent ULg; THIRY, Albert ULg et al

in Endocrine Abstracts - 15th European Congress of Endocrinology (2013, May)

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See detailCompact integrated surface plasmon resonance spectroscopic sensor platform with on-chip self-referencing
Hastanin, Juriy ULg; Fleury-Frenette, Karl ULg; Lenaerts, Cedric ULg et al

in Proceeding of the International Conference on Surface Plasmon Photonics (SPP6): Ottawa, Canada, May 2013 (2013, May)

We present the SPR_CD spectroscopic biosensor design experimentally investigated by our research group. The implemented sensor platform is dedicated to droplet biochemical analysis involving multichannel ... [more ▼]

We present the SPR_CD spectroscopic biosensor design experimentally investigated by our research group. The implemented sensor platform is dedicated to droplet biochemical analysis involving multichannel detection format. [less ▲]

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See detailStructural optimization of flexible components under dynamic loading within a multibody system approach: a comparative evaluation of optimization methods based on a 2-dof robot application.
Tromme, Emmanuel ULg; Bruls, Olivier ULg; Virlez, Geoffrey ULg et al

in Proceedings of the 10th World Congress on Structural and Multidisciplinary Optimization: Orlanda (USA), 19-24 mai 2013 (2013, May)

This paper is dedicated to a comparative evaluation between two methods of optimization to realize the structural optimization of flexible components in mechanical systems modeled as multibody systems. A ... [more ▼]

This paper is dedicated to a comparative evaluation between two methods of optimization to realize the structural optimization of flexible components in mechanical systems modeled as multibody systems. A nonlinear finite element method based formalism is considered for the dynamic simulation of the flexible multibody system. The first method is the Equivalent Static Load method which enables to transform a dynamic response optimization problem into a set of static response optimization problems. The second method treats directly the dynamic optimization problem in an integrated manner where the optimization process is carried out directly based on the time response coming from the multibody system approach. However, the first method proposed by Kang, Park and Arora was developed under the assumption that the multibody system is described using a floating frame of reference. Therefore, in order to carry on the comparison using a unique multibody system approach, a method is first proposed to derive the equivalent static loads when using a nonlinear finite element method based formalism. The comparative evaluation is then carried out on the simple academic example of the mass minimization of a two-arm robot subject to tracking deviation constraints. Conclusions are finally drawn for future work and stringent comparison. [less ▲]

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See detailReview of the Newmark method predicting seismic slope displacements - the focus on the Arias Intensity amplification factor
Torgoev, Almazbek ULg; Havenith, Hans-Balder ULg; Lamair, Laura ULg

in Proceedings of the International Symposium in Commemoration of the 2008 Wenchuan Earthquake (2013, May)

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See detailNonlinear guitar loudspeaker simulation
Schmitz, Thomas ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the AES 134 th convention (2013, May)

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See detailUpdate on bone metabolism in premature infants
SENTERRE, Thibault ULg

in 5th International Clinical & Community Nutrition Conference (2013, May)

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See detailHolographic interferometry based on photorefractive crystal to measure 3D thermo-elastic distortion of composite structures and comparison with finite element models
Thizy, Cédric ULg; Eliot, F.; Olympio, K.R. et al

in Lehmann, Peter (Ed.) Proc. SPIE Vol 8788 on Optical Measurement Systems for Industrial Inspection VIII (2013, May)

Thermo-elastic distortions of composite structures have been measured by a holographic camera using a BSO photorefractive crystal as the recording medium. The first test campaign (Phase 1) was performed ... [more ▼]

Thermo-elastic distortions of composite structures have been measured by a holographic camera using a BSO photorefractive crystal as the recording medium. The first test campaign (Phase 1) was performed on CFRP struts with titanium end-fittings glued to the tips of the strut. The samples were placed in a vacuum chamber. The holographic camera was located outside the chamber and configured with two illuminations to measure the relative out-of-plane and in-plane (in one direction) displacements. The second test campaign (Phase 2) was performed on a structure composed of a large Silicon Carbide base plate supported by 3 GFRP struts with glued Titanium end-fittings. Thermo-elastic distortions have been measured with the same holographic camera used in phase 1, but four illuminations, instead of two, have been used to provide the three components of displacement. This technique was specially developed and validated during the phase 2 in CSL laboratory. The system has been designed to measure an object size of typically 250x250 mm²; the measurement range is such that the sum of the largest relative displacements in the three measurement directions is maximum 20 μm. The validation of the four-illuminations technique led to measurement uncertainties of 120 nm for the relative in-plane and out-of-plane displacements, 230 nm for the absolute in-plane displacement and 400 nm for the absolute out-of-plane displacement. For both campaigns, the test results have been compared to the predictions obtained by finite element analyses and the correlation of these results was good [less ▲]

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See detailLe point sur le permis d'urbanisation
Onclin, François ULg; Vercheval, Cécile ULg

in Pâques, Michel; Delnoy, Michel (Eds.) Chroniques notariales (vol. 57) (2013, April 25)

Cette contribution fait le point sur le réforme qui a remplacé le permis de lotir par le permis d'urbanisation en droit wallon

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See detailA Computational Homogenization Method for the Evaluation of Eddy Current in Nonlinear Soft Magnetic Composites
Niyonzima, Innocent ULg; Vazquez Sabariego, Ruth ULg; Dular, Patrick ULg et al

in Proceeding of the 9th International Symposium on Electric and Magnetic Fields, EMF 2013 (2013, April 23)

The use of the soft magnetic composite (SMC) in electric devices has increased in recent years. These materials made from a metallic powder compacted with a dielectric binder are a good alternative to ... [more ▼]

The use of the soft magnetic composite (SMC) in electric devices has increased in recent years. These materials made from a metallic powder compacted with a dielectric binder are a good alternative to laminated ferromagnetic structures as their granular mesoscale structure allows to significantly reduce the eddy current losses. Furthermore unlike the laminated ferromagnetic structures, SMC exhibit isotropic magnetic properties what makes them good candidates for manufacturing machines with 3D flux paths. The isotropy of the thermal conductivity also allows for a more efficient heat dissipation. The use of classical numerical methods such as the finite element method to study the behavior of SMC is computational very expensive. Indeed a very fine mesh would be required in order to capture fine scale variations i.e. variations at level of metallic grains whence the use of multiscale methods for modelling SMC. The application of multiscale method to study the behaviour of SMC is relatively recent. In (A. Bordianu et al “A Multiscale Approach to Predict Classical Losses in Soft Magnetic Composites”, IEEE Trans. Mag., vol. 48, no. 4, 2012.), the authors used a homogenization technique to compute electrical and magnetic constitutive laws on a representative volume element (RVE). These laws were then used in finite element computations. Herein, the RVE has been chosen to account for the grain- grain contact that can occur in a actual SMC structure due to the compaction process and that can lead to the appearance of macroscale eddy currents. In this paper, we will extend the computational homogenization method success- fully used for modelling the behaviour of laminated ferromagnetic cores in mag- netodynamics (I. Niyonzima et al “Computational Homogenization for Laminated Ferromagnetic Cores in Magnetodynamics”, in Proc. of the 15th Biennal Confer- ence on Electromagnetic Field Computation, 2012) to the case of SMC. The method is based on the heterogeneous multiscale method (HMM) and couples two types of problems: a macroscale problem that captures the slow variations of the overall so- lution and many microscale problems that allow to determine the constitutive laws at the macroscale. The choice of RVE will also be discussed. [less ▲]

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See detailCOMPARISON OF PIEZOELECTRIC AND CRUSHER MEASUREMENTS OF CHAMBER PRESSURE WITH FINITE ELEMENT MODELING RESULTS
Coghe, Frédéric; Elkarous, Lamine ULg

in International Symposium on Ballistics (2013, April 23)

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See detailSubproblem h-Conform Formulation for Accurate Thin Shell Models Between Conducting and Nonconducting Regions
Dang, Quoc Vuong ULg; Dular, Patrick ULg; Vazquez Sabariego, Ruth ULg et al

in Proceeding of the 9th International Symposium on Electric and Magnetic Fields, EMF 2013 (2013, April 23)

A subproblem method (SPM) with h-formulation is developed for correcting the inaccuracies near edges and corners that arise from using thin shell (TS) models to replace thin volume regions by surfaces ... [more ▼]

A subproblem method (SPM) with h-formulation is developed for correcting the inaccuracies near edges and corners that arise from using thin shell (TS) models to replace thin volume regions by surfaces. The developed surface-to-volume correction problem is defined as a step of multiple SPs, with inductors and magnetic or conducting regions, some of them being thin. The TS model assumes that the fields in the thin regions are approximated by a priori 1-D analytical distributions along the shell thickness (C. Geuzaine et al., “Dual formulations for the modeling of thin electromagnetic shells using edge elements,” IEEE Trans. Magn., vol. 36, no. 4, pp. 799–802, 2000). Their interior is not meshed and ratherextracted from the studied domain, which is reduced to a zero-thickness double layer with interface conditions (ICs) linked to 1-D analytical distributions that however neglect end and curvature effects. This leads to inaccuracies near edges and corners that increase with the thickness. To cope with these difficulties, the authors have recently proposed a SPM based on the h-formulation for a thin region located between non-conducting regions (Vuong Q. Dang et al., “Subproblem Approach for Thin Shell Dual Finite Element Formulations”, IEEE Trans. Magn., vol. 48, no. 2, pp. 407–410, 2012). The magnetic field h is herein defined in nonconducting regions by means of a magnetic scalar potential , i.e. h = -grad{\phi} , with discontinuities of through the TS. In this paper, the SPM is extended to account for thin regions located between conducting regions or between conducting and nonconducting regions, in the general case of multiply connected regions. In these regions, the potential is not defined anymore on both sides of the TS and the problem has to be expressed in terms of the discontinuities of h, possibly involving on one side only, to be strongly defined via an IC through the TS. In the proposed SP strategy, a reduced problem with only inductors is first solved on a simplified mesh without thin and volume regions. Its solution gives surface sources (SSs) as ICs for added TS regions, and volume sources (VSs) for possible added volume regions. The TS solution is further improved by a volume correction via SSs and VSs that overcome the TS assumptions, respectively suppressing the TS model and adding the volume model. Each SP has its own separate mesh, which increases the computational efficiency. Details on the proposed method will be given in the extended paper, with practical applications. [less ▲]

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See detailSeasonal hypoxia in the Black Sea north-western shelf. Is there any recovery after eutrophication ?
Capet, Arthur ULg; Beckers, Jean-Marie ULg; Grégoire, Marilaure ULg

in 9th EGU General Assembly (2013, April 11)

The Black Sea North-western shelf (NWS) is a shallow eutrophic area in which seasonal tratification of the water column isolates bottom waters from the atmosphere and prevents entilation to compensate for ... [more ▼]

The Black Sea North-western shelf (NWS) is a shallow eutrophic area in which seasonal tratification of the water column isolates bottom waters from the atmosphere and prevents entilation to compensate for the large consumption of oxygen, due to respiration in the bottom aters and in the sediments. A 3D coupled physical biogeochemical model is used to investigate he dynamics of bottom hypoxia in the Black Sea NWS at different temporal scales from seasonal o interannual (1981-2009) and to differentiate the driving factors (climatic versus eutrophication) f hypoxic conditions in bottom waters. Model skills are evaluated by comparison with 14500 in- itu oxygen measurements available in the NOAA World Ocean Database and the Black Sea ommission data. The choice of skill metrics and data subselections orientate the validation rocedure towards specific aspects of the oxygen dynamics, and prove the model’s ability to esolve the seasonal cycle and interannual variability of oxygen concentration as well as the patial location of the oxygen depleted waters and the specific threshold of hypoxia. During the eriod 1981-2009, each year exhibits seasonal bottom hypoxia at the end of summer. This henomenon essentially covers the northern part of the NWS, receiving large inputs of nutrients rom the Danube, Dniestr and Dniepr rivers, and extends, during the years of severe hypoxia, owards the Romanian Bay of Constanta. In order to explain the interannual variability of bottom ypoxia and to disentangle its drivers, a statistical model (multiple linear regression) is proposed sing the long time series of model results as input variables. This statis- tical model gives a eneral relationships that links the intensity of hypoxia to eutrophication and climate related variables. The use of four predictors allows to reproduce 78% of hypoxia interannual variability: he annual nitrate discharge (N ), the sea surface temperature in the month preceding tratification (T ), the amount of semi-labile organic matter in the sediments (C) and the duration f the stratification (D). Eutrophication (N ,C) and climate (T ,D) predictors explain a similar mount of variability (∼ 35%) when considered separately. A typical timescale of 9.3 years is found to describe the inertia of sediments in the recovering process after eutrophication. From his analysis, we find that under standard conditions (i.e. average atmospheric conditions, ediments in equi- librium with river discharges), the intensity of hypoxia can be linked to the evel of nitrate discharge through a non-linear equation (power law). Bottom hypoxia does not ffect the whole Black Sea NWS but rather exhibits an important spatial variability. This heterogeneous distribution, in addition to the seasonal fluctuations, complicates the monitoring f ottom hypoxia leading to contradictory conclusions when the interpretation is done from different ets of data. We find that it was the case after 1995 when the recovery process was verestimated due to the use of observations concentrated in areas and months not typically ffected by hypoxia. This stresses out the urging need of a dedicated monitoring effort in the WS f the Black Sea focused on the areas and the period of the year concerned by recurrent hypoxic events. [less ▲]

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See detailDynamic Stall and Stall Flutter Simulations for a 2D Airfoil Using Viscous-Inviscid Coupling
Rothkegel Ide, José Ignacio ULg; Dimitriadis, Grigorios ULg

in Proceedings of the 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (2013, April 10)

An interactive boundary layer model has been developed and coupled with a pitch plunge airfoil in 2d in order to solve the unsteady flow around the airfoil when undergoing light dynamic stall. The ... [more ▼]

An interactive boundary layer model has been developed and coupled with a pitch plunge airfoil in 2d in order to solve the unsteady flow around the airfoil when undergoing light dynamic stall. The inviscid problem is solved by means of a panel method, by the discretization of the airfoil into vortex panels. The boundary layer is solved in a mixed manner, starting the solution in a direct way by imposing the external velocity and continuing it in an inverse way by imposing the displacement thickness. The solution of the boundary layer equations is carried out using a finite volume scheme. Viscous-inviscid coupling is preformed through the imposition of a permeation velocity on the skin panels of the airfoil and the addition of a free wake at each separation point. [less ▲]

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See detailValidation of the Structural-Thermal Model of the Small Earth Observation Satellite Flying Laptop
Steinmetz, Fabian; Lengowski, Michael; Winter, Daniel et al

in Selected Proceedings of the 9th IAA International Symposium on Small Satellites for Earth Observation (2013, April 10)

Thorough thermal design and testing is compulsory for every satellite mission. A well-known thermal behavior of the entire satellite system is therefore indispensable and needs to be verified during the ... [more ▼]

Thorough thermal design and testing is compulsory for every satellite mission. A well-known thermal behavior of the entire satellite system is therefore indispensable and needs to be verified during the spacecraft development. A Structural-Thermal-Model (STM) was constructed for the Flying Laptop, a satellite currently being developed at the Institute of Space Systems (IRS) of the University of Stuttgart, which enables the validation of mechanical and thermal simulations for the satellite’s Flight-Model. The STM was vibration and thermal-vacuum tested at the Centre Spatial Liège (CSL). This paper will de-scribe the design and construction of the STM as well as the facilities and test equipment used for the tests. Conclusions will be drawn from the actual test results. [less ▲]

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See detail"Qui s'y colle, s'y pique" - Regard d'une évaluatrice sur ses pratiques
Vandoorne, Chantal ULg

in Symposiums & ateliers - Les résumés (2013, April 05)

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See detailDual Formulations for Accurate Thin Shell Models in a Finite Element Subproblem Method
Dang, Quoc Vuong ULg; Dular, Patrick ULg; Vazquez Sabariego, Ruth ULg et al

in Proceeding of the 19th COMPUMAG Conference on the Computation of Electromagnetic Fields, 2013 (2013, April 01)

A subproblem finite with dual finite element magnetostatic and magnetodynamic formulations is developed for correcting the inaccuracies near edges and corners coming from thin shell models, that replace ... [more ▼]

A subproblem finite with dual finite element magnetostatic and magnetodynamic formulations is developed for correcting the inaccuracies near edges and corners coming from thin shell models, that replace thin volume regions by surfaces. The surface-to-volume correction problem is defined as one of the multiple subproblems applied to a complete problem, considering successive additions of inductors and magnetic or conducting regions, some of these being thin regions. Each SP requires a proper adapted mesh of its regions, which facilitates meshing and increases computational e ciency. [less ▲]

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See detailTRAPPIST-UCDTS: A prototype search for habitable planets transiting ultra-cool stars
Gillon, Michaël ULg; Jehin, Emmanuel ULg; Fumel, A. et al

in Saglia, Roberto (Ed.) European Physical Journal Web of Conferences (2013, April 01)

The ˜1000 nearest ultra-cool stars (spectral type M6 and latter) represent a unique opportunity for the search for life outside solar system. Due to their small luminosity, their habitable zone is 30-100 ... [more ▼]

The ˜1000 nearest ultra-cool stars (spectral type M6 and latter) represent a unique opportunity for the search for life outside solar system. Due to their small luminosity, their habitable zone is 30-100 times closer than for the Sun, the corresponding orbital periods ranging from one to a few days. Thanks to this proximity, the transits of a habitable planet are much more probable and frequent than for an Earth-Sun analog, while their tiny size (˜1 Jupiter radius) leads to transits deep enough for a ground-based detection, even for sub-Earth size planets. Furthermore, a habitable planet transiting one of these nearby ultra-cool star would be amenable for a thorough atmospheric characterization, including the detection of possible biosignatures, notably with the near-to-come JWST. Motivated by these reasons, we have set up the concept of a ground-based survey optimized for detecting planets of Earth-size and below transiting the nearest Southern ultra-cool stars. To assess thoroughly the actual potential of this future survey, we are currently conducting a prototype mini-survey using the TRAPPIST robotic 60cm telescope located at La Silla ESO Observatory (Chile). We summarize here the preliminary results of this mini-survey that fully validate our concept. [less ▲]

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See detailCHEOPS: A transit photometry mission for ESA's small mission programme
Broeg, C.; Fortier, A.; Ehrenreich, D. et al

in Saglia, Roberto (Ed.) European Physical Journal Web of Conferences (2013, April 01)

Ground based radial velocity (RV) searches continue to discover exoplanets below Neptune mass down to Earth mass. Furthermore, ground based transit searches now reach milli-mag photometric precision and ... [more ▼]

Ground based radial velocity (RV) searches continue to discover exoplanets below Neptune mass down to Earth mass. Furthermore, ground based transit searches now reach milli-mag photometric precision and can discover Neptune size planets around bright stars. These searches will find exoplanets around bright stars anywhere on the sky, their discoveries representing prime science targets for further study due to the proximity and brightness of their host stars. A mission for transit follow-up measurements of these prime targets is currently lacking. The first ESA S-class mission CHEOPS (CHaracterizing ExoPlanet Satellite) will fill this gap. It will perform ultra-high precision photometric monitoring of selected bright target stars almost anywhere on the sky with sufficient precision to detect Earth sized transits. It will be able to detect transits of RV-planets by photometric monitoring if the geometric configuration results in a transit. For Hot Neptunes discovered from the ground, CHEOPS will be able to improve the transit light curve so that the radius can be determined precisely. Because of the host stars' brightness, high precision RV measurements will be possible for all targets. All planets observed in transit by CHEOPS will be validated and their masses will be known. This will provide valuable data for constraining the mass-radius relation of exoplanets, especially in the Neptune-mass regime. During the planned 3.5 year mission, about 500 targets will be observed. There will be 20% of open time available for the community to develop new science programmes. [less ▲]

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See detailLa nationalité et l'accès au notariat
Onclin, François ULg

in Chroniques notariales (vol. 57) (2013, April)

Ce court flash évoque plusieurs arrêts prononcés le 24 mai 2011 par la Cour de justice de l'Union européenne (CJUE) à propos de la condition de nationalité pour l'accès à la profession de notaire dans les ... [more ▼]

Ce court flash évoque plusieurs arrêts prononcés le 24 mai 2011 par la Cour de justice de l'Union européenne (CJUE) à propos de la condition de nationalité pour l'accès à la profession de notaire dans les Etats membres [less ▲]

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See detailPreliminary Characterization of monovarietal virgin olive oils produced in eastern area of Morocco
Mansouri, F.; Ben Moumen, A.; Lopez, G. et al

in Book of Proceedings InsideFood Symposium (2013, April)

Traditional olive oil production is limited by its high cost, mainly due to labour expenses for harvesting and pruning. New olive cultivars (e.g. Arbequina, Arbosana, Koroneiki) with greater adaptability ... [more ▼]

Traditional olive oil production is limited by its high cost, mainly due to labour expenses for harvesting and pruning. New olive cultivars (e.g. Arbequina, Arbosana, Koroneiki) with greater adaptability to modern irrigated high-density orchards and producing good quality olive oils are highly demanded by an olive oil industry in continuous change The aim of this study is the characterization of monovarietal virgin olive oils from three cultivars (Arbequina, Arbosana and Koroneiki) recently introduced in east of Morocco, and the comparison with traditional local Picholine Marocaine olive oil. Several analytical parameters were evaluated; including quality index, Triacylglycerol, fatty acids, phenolic and chlorophyll contents and oxidative stability. Significant differences between the analysed olive oils were detected. Olive oils from Koroneiki and Arbosana cultivars had higher values of oleic acid (respectively 76.24 and 75.68 %); Picholine olive oil, had the lowest one 67.49%. Koroneiki olive oil was noteworthy for its higher content of phenolic compounds (459.48 mg/ kg) and a high oxidative stability (93.16 h). We concluded that the recently introduced cultivars are well adapted to the eastern area of Morocco and could be of great interest for producing monovarietal olive oils. [less ▲]

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See detailOptimized Schwarz Algorithm with Double Sweep Preconditioner for the Helmholtz Equation
Vion, Alexandre ULg; Geuzaine, Christophe ULg

in Proceedings of the 9th International Symposium on Electric and Magnetic Fields, EMF 2013 (2013, April)

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See detailComparative study of four safflower oils (Carthamus tinctorius) varieties grown in eastern of Morocco
Ben Moumen, A.; Mansouri, F.; Zraibi, L. et al

in Book of Proceedings InsideFood Symposium (2013, April)

In this study, four safflower varieties, originating from Spain (Rancho), India (Sharda) and Morocco (Cartamar and Cartafri) cultivated at the experimental station of OUJDA (semi-arid region of Eastern ... [more ▼]

In this study, four safflower varieties, originating from Spain (Rancho), India (Sharda) and Morocco (Cartamar and Cartafri) cultivated at the experimental station of OUJDA (semi-arid region of Eastern Morocco) were evaluated for their oil yield and seed oil quality. The analysis of results revealed significant differences among varieties for all traits. Indeed, our result show that seeds of the four varieties have important oil content ranged between 35.38% (Rancho) and 28.84% (Cartamar). Characterization of these oils showed a low value of acidity index less than 0.7% for all the varieties but significant differences in their peroxide values ranged between 4.5 meq O2/Kg (Cartamar) and 31.21 mEqO2/Kg (Rancho) and high value of phenolic content between 143 ppm (Rancho) and 97 ppm (Sharda). Analysis of the fatty acids shows that linoleic acid is the main fatty acid ranged between 77.94% (Cartamar) and 79.98% (Sharda). Oils of those four varieties can be classified in the linoleic acid group. The analysis of triglycerides by HPLC shows 10 molecular species of TAG (LLL, LPL, LLO, PLO, LLS, POP, OOO, POO, SOO, PPL). The trilinoleate (LLL) is the main molecular species with more than 50%. Safflower seed oil cultivated in eastern Morocco presents good physicochemical proprieties (polyphenols and Omega 6 richness); therefore, safflower culture could be suggested for all areas of Morocco, including the areas of low pluviometry, while the potential for culture of other oilseeds is more limited. [less ▲]

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See detailL'actualité en matière de sanctions d'urbanisme
Onclin, François ULg

in Chroniques notariales (vol. 57) (2013, April)

Cette contribution fait le point sur l'actualité (principalement jurisprudentielle) récente en matière de sanctions d'urbanisme

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See detailTrace Minerals Management in Cattle
Rollin, Frédéric ULg; Guyot, Hugues ULg

in XVIII Congreso Internacional Anembe de Medicina Bovina (2013, April)

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See detailLes équations allométriques pan-tropicales plurispécifiques sont-elles valables en Afrique centrale ?
Fayolle, Adeline ULg; Doucet, Jean-Louis ULg; Gillet, Jean-François ULg et al

in Picard, Nicolas; Henry, Mathieu (Eds.) Compte-rendu de l'Atelier scientifique régional sur les équations allométriques en Afrique Centrale : PREREDD, Yaoundé 2-5 avril 2013 (2013, April)

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See detailTheorical study of a volumetric hot air Joule cycle engine
Oudkerk, Jean-François ULg; Lemort, Vincent ULg

in Proceedings of the 3rd International Conference on Microgeneration and Related Technologies (2013, April)

Detailed reference viewed: 36 (9 ULg)
See detailHidden faults in the Gobi Desert (Inner Mongolia, China) revealed by microtremor analysis, ground-penetrating radar and SQUID-supported transient electromagnetics
Rudersdorf, A.; Hölz, S.; Torgoev, A. et al

in EGU General Assembly Conference Abstracts (2013, April)

Abstract: The endorheic Gaxun Nur Basin (GNB, also Ejina Basin, Hei river Basin, Ruoshui Basin) in the eastern Gobi desert is situated between the northern Tibetan Plateau and the Gobi Altai mountains ... [more ▼]

Abstract: The endorheic Gaxun Nur Basin (GNB, also Ejina Basin, Hei river Basin, Ruoshui Basin) in the eastern Gobi desert is situated between the northern Tibetan Plateau and the Gobi Altai mountains. Recent fault activity is concentrated on the sinistral Altyn Tagh Fault, its eastern continuations and the Qilian Shan frontal thrust in the south, which are induced by the stress field of the India-Eurasia continental collision. In the north, the basin is bound by the Gobi Altai mountains with the major sinistral Gobi-Tien Shan Fault System. The ... [less ▲]

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See detailThérapeutiques récentes des tendinopathies du sportif (ondes de choc, injections de plaquettes, ...)
Crielaard, Jean-Michel ULg; Kaux, Jean-François ULg

in Abstract book du 21ème Séminaire hivernal de Médecine sportive 2013 (2013, April)

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See detailEffect of current flow on bipolar plate/gas diffusion layer interfacial contact resistance in Proton Exchange Membrane fuel cells (PEMFC)
Stergiopoulos, Vaios ULg; Lafort, Adeline; Maseri, Fabrizio et al

in Proceedings of the Fundamentals and Development of Fuel cells 2013 conference (2013, April)

Stainless steel bipolar plates can be excellent alternative to graphite bipolar plates since they display better mechanical properties and the manufacturing procedure is easier and cheaper. However, they ... [more ▼]

Stainless steel bipolar plates can be excellent alternative to graphite bipolar plates since they display better mechanical properties and the manufacturing procedure is easier and cheaper. However, they are chemically instable in the corrosive environment of PEMFCs, and a thin oxide layer is developed on the plate’s surface. This layer causes a significant increase in the interfacial contact resistance (ICR) between the plates and gas diffusion layers. In an effort to characterize various stainless steel samples, before and after their exposure to the corrosive environment of a PEMFC, the interfacial contact resistance (ICR) between the plates and a commercial gas diffusion layer (GDL) was studied as a function of the pressure applied on the assembly. The ICR was studied in the range of 0-500 N/cm2 of pressure applied to the assembly; the ICR value was determined by means of galvanostatic potentiometry, where a constant current is applied to the assembly and the average value of the potential over time is recorded. The ICR is then calculated, after appropriate simplifications, as: ICR = Rtot = Iapplied / Vmonitored (1) It was observed that, besides the expected exponential reduction of ICR versus pressure, the value of the current applied to the assembly impacted greatly the obtained values for the ICR, irrespective of the applied pressure. This indicates that the observed phenomenon is not caused by any morphological changes on the interface. A possible explanation is that, at higher currents, the temperature increases locally due to ohmic heating, inducing thus changes in the GDL’s resistivity. [less ▲]

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See detailON THE MODELING OF ADHESIVE CONTACT AND STICTION FAILURE IN MICRO-SWITCHES
Wu, Ling ULg; Noels, Ludovic ULg; Golinval, Jean-Claude ULg

in Ouisse (FEMTO-ST – ENSMM, France); Deü (CNAM, FR), J.F. (Eds.) MEDYNA 2013 Proceedings (2013, April)

Undesirable stiction, which results from contact between surfaces, is a major failure mode in micro-switches. Indeed the adhesive forces can become so important that the two surfaces remain permanently ... [more ▼]

Undesirable stiction, which results from contact between surfaces, is a major failure mode in micro-switches. Indeed the adhesive forces can become so important that the two surfaces remain permanently glued, limiting the life-time of the MEMS. This is especially true when contact happens between surfaces where elasto-plastic asperities deform permanently until the surfaces reach plastic accommodation, increasing the surface forces. To predict this behavior, a micro adhesive-contact model is developed, which accounts for the surfaces topography evolutions during elasto-plastic contacts. This model can be used at a higher scale to study the MEMS behavior, and thus its life-time. For illustration purpose, an electrostatic-structural analysis is performed on a micro-switch. [less ▲]

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See detailPanorama des migrations en région liégeoise : aspects économiques, culturels et politiques
Molina Marmol, Maïté ULg

in Migrations in the Waloon Region (2013, April)

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See detailA nation-wide project for the revision of the Belgian Nursing Minimum Dataset: from concept to implementation
THONON, Olivier ULg

in Proceedings of the Saudi International Conference of Excellence in Patient Care -Saudi Organizer Co. (2013, April)

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See detailNonparametric subspace identification of nonlinear structures - Application to a spacecraft
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference (2013, April)

The objective of the present paper is to address the identification of a strongly nonlinear satellite structure by exploiting a new nonlinear subspace identification method formulated in the frequency ... [more ▼]

The objective of the present paper is to address the identification of a strongly nonlinear satellite structure by exploiting a new nonlinear subspace identification method formulated in the frequency domain, referred to as the FNSI method. The modal parameters of the underlying linear structure and the coefficients of the nonlinear internal forces will be estimated by this approach. Moreover, because a priori knowledge about nonlinear behaviour may be limited, the paper also proposes a nonparametric spline-based modelling strategy, encapsulated in the FNSI method. The application of interest is the SmallSat spacecraft developed by EADS-Astrium, which possesses an impact-type nonlinear device consisting of eight mechanical stops limiting the motion of an inertia wheel mounted on an elastomeric interface. [less ▲]

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See detailA comparison of piston, screw and scroll expanders for small scale Rankine cycle systems
Lemort, Vincent ULg; Guillaume, Ludovic ULg; Legros, Arnaud ULg et al

in Proceedings of the 3rd International Conference on Microgeneration and Related Technologies (2013, April)

This paper aims at helping the designer of micro-scale Rankine Cycle heat engines to best select the expander among piston, screw and scroll machines. The first part of the paper presents a state of the ... [more ▼]

This paper aims at helping the designer of micro-scale Rankine Cycle heat engines to best select the expander among piston, screw and scroll machines. The first part of the paper presents a state of the art of these three technologies of positive displacement machines. The technical constraints inherent to each machine (rotational speed, pressure ratios, maximum temperatures, volumetric expansion ratios, etc.) are listed and the performance mentioned in the open technical and scientific literature is presented. The second part of the paper deals with the modeling of such expanders. Different simulation models are proposed: black-box, grey-box and white-box models. These three categories of modeling are specifically adapted to different purposes: design of the expander, design of the micro-CHP system, and dynamic simulation/control of the CHP unit. The last part of the paper presents a graphical methodology of selection of expansion machines and working fluids based on operating maps. It is stressed that the selections of both the expansion machine and working fluid should be conducted simultaneously. [less ▲]

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See detailTowards a better understanding of the respiratory distress syndrome in full-term newborn calves
Rollin, Frédéric ULg; Guyot, Hugues ULg

in XVIII Congreso Internacional Anembe de Medicina Bovina (2013, April)

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See detailTendinopathies et lésions particulières de la cheville et du pied du sportif
Crielaard, Jean-Michel ULg; Kaux, Jean-François ULg

in Abstract book du 21ème Séminaire hivernal de Médecine sportive 2013 (2013, April)

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See detailModélisation régionale et locale sur base des données de la carte géologique
Orban, Philippe ULg

in Renard, José (Ed.) La carte hydrogéologique de Wallonie : un outil au service de tous - Synthèse des exposés (2013, April)

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See detailConception des pseudo-articulations à col paraboique
Debongnie, Jean-François ULg

in Agiuzoul, Mohammed (Ed.) 11ème Congrès de Mécanique - Actes du Congrès (2013, April)

The elastic behaviour of parabolic notch hinges submitted to the classical sollicitations of a beam is studied. For each sollicitation, an analytical solution is given first. Its asymptotic expression for ... [more ▼]

The elastic behaviour of parabolic notch hinges submitted to the classical sollicitations of a beam is studied. For each sollicitation, an analytical solution is given first. Its asymptotic expression for very narrow hinges is then obtained and finally,, an approximate factor relating the exact solution to the asymptotic one is proposed. [less ▲]

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See detailL’indice paysager Caulerpa racemosa “I.Ca.r”
Cariou, Nicolas; Chery, Aurélia; Jousseaume, Matthieu et al

in Ifremer (Ed.) CARtographie des HAbitats Marins Benthiques : de l'Acquisition à la Restitution (2013, March 27)

Depuis 2002, l’algue invasive Caulerpa racemosa var. cylindracea a été signalée au niveau de la Corse. Elle apparaît pour la première fois, en 2008, au niveau de la baie de Calvi (Corse). Depuis cette ... [more ▼]

Depuis 2002, l’algue invasive Caulerpa racemosa var. cylindracea a été signalée au niveau de la Corse. Elle apparaît pour la première fois, en 2008, au niveau de la baie de Calvi (Corse). Depuis cette époque, le nombre et la surface des sites envahis augmentent. L'analyse fine de l'évolution spatio-temporelle de sa distribution dans la zone prospectée confirme que C. racemosa colonise d'abord les sites profonds. A partir des différents stades de colonisation, un indice paysager (Indice Caulerpa racemosa: "I.Ca.r") adapté à la plongée en scaphandre autonome a été élaboré. "I.Ca.r" qui tient compte de l'expérience du plongeur, du type de substrat et de la superficie colonisée est un code à 8 caractères. Il permet une comparaison spatiale de sites colonisés et également une analyse de l'évolution temporelle de la colonisation. Mis au point en Baie de Calvi, l'indice paysager "I.Ca.r" peut être appliqué sur la Corse et sur l'ensemble de La Méditerranée. La méthodologie simple, résumée sur une fiche pourrait être distribuée dans les clubs de plongée et les informations envoyées au réseau Caulerpe par exemple. [less ▲]

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See detailDynamiques complexes de rebonds d'une goutte placée sur un bain vibré: résonances et anti-résonances
Hubert, Maxime ULg; Vandewalle, Nicolas ULg

in Hubert, Maxime; Vandewalle, Nicolas (Eds.) Comptes-rendus de la 16e Rencontre du Non-linéaire Paris 2013 (2013, March 25)

We present herebelow a model for bouncing droplets consisting of two masses joined by a spring and a damper bouncing onto an oscillating plate. We analyze the dynamics through the bouncing threshold and ... [more ▼]

We present herebelow a model for bouncing droplets consisting of two masses joined by a spring and a damper bouncing onto an oscillating plate. We analyze the dynamics through the bouncing threshold and spatio-temporal diagrams. We obtain an analytic expression for the threshold. Resonance and Anti-resonance phenomena are found and investigated. The behavior of the bouncing spring is compared to the bouncing droplet dynamics. In particular, key features of the bouncing droplet dynamics are reproduced. [less ▲]

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See detailMyeloperoxidase activity decreases in equine semen freezing extenders
Ponthier, Jérôme ULg; Franck, Thierry ULg; Niesten, Ariane ULg et al

in Amir, Arav (Ed.) Proceedings of the 3rd Cryo Congress (2013, March 23)

Myeloperoxidase (MPO) is a pro-oxidant enzyme contained in and released by neutrophils, and associated with decreased post-thaw motility of equine semen. This study aimed to compare MPO activity in pure ... [more ▼]

Myeloperoxidase (MPO) is a pro-oxidant enzyme contained in and released by neutrophils, and associated with decreased post-thaw motility of equine semen. This study aimed to compare MPO activity in pure equine freezing extender, raw and post-thaw semen. Active MPO Concentration (AMC) was measured with Specific Immunologic Extraction Followed by Enzymatic Detection in 20 ejaculates. Raw semen intra cellular AMC was determined in the supernatant after membrane lysis, each pellet containing 100x106 spermatozoa. AMC was also assayed in supernatants of semen frozen following a conventional method using INRA FreezeTM (IMV, France). Effect of freezing procedure on AMC was tested by experimentally adding 500ng of purified active MPO (Calbiochem, Germany) in 4 samples either with 5ml of PBS or INRA FreezeTM before assay. AMC was higher in sperm-rich pellet (0.306ng/ml) than in post-thaw semen (0.002ng/ml) (p=0.058). After experimental MPO addition, no activity variation was observed during the freezing procedure (after dilution, 1, 2 hours of cooling and post-thawing) within the same medium. Purified MPO activity was decreased in INRA FreezeTM when compared to PBS at all timings of sampling (p=0.0286). When all samples were pooled, remaining activity in INRA FreezeTM was 23.93±13.13%. MPO fixation on large proteins contained in the extender experimentally reduces AMC, as previously observed in plasma. However, AMC decrease observed during semen freezing is more important than after experimental addition. That could be explained by a MPO interaction with seminal plasma, a partial MPO release or a MPO inactivation during equine semen freezing. [less ▲]

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See detailHow to use Diigo for allowing the students from large classes to become active ?
Colaux, Catherine ULg

in 7th International Technology, Education and Development Conference Valencia, Spain. 4-5 March, 2013. (2013, March 04)

Teaching in the early bachelor’s degrees at the university often comes down to classical ex cathedra courses for which the students take a passive role leading progressively to the lost of their ... [more ▼]

Teaching in the early bachelor’s degrees at the university often comes down to classical ex cathedra courses for which the students take a passive role leading progressively to the lost of their motivation which may result in school failure. In this work, we demonstrate that the use of a collaborative social bookmarking, such as Diigo, can help for preserving and promoting the student motivation within large classes. Diigo is a free online tool used in a bachelor class of Bio Engineering (270 students) at the Gembloux Agro Bio Tech Faculty (University of Liege, Belgium) in order to allow students to work actively in small groups of 6 students. During this activity, which is supervised by a tutor who is also a teacher, the students prepare themselves the subject of the course. The impacts of this learning activity are clear: the motivation is substantially increased and the teacher can assist each group in its research through the Network rather than merely transmit his knowledge to a large audience without close interactions with the students. bookmarking, such as Diigo, can help for preserving and promoting the student motivation within large classes. Diigo is a free online tool used in a bachelor class of Bio Engineering (270 students) at the Gembloux Agro Bio Tech Faculty (University of Liege, Belgium) in order to allow students to work actively in small groups of 6 students. During this activity, which is supervised by a tutor who is also a teacher, the students prepare themselves the subject of the course. The impacts of this learning activity are clear: the motivation is substantially increased and the teacher can assist each group in its research through the Network rather than merely transmit his knowledge to a large audience without close interactions with the students. [less ▲]

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See detailAn abundance study of the red giants in the seismology fields of the CoRoT satellite
Morel, Thierry ULg; Miglio, A.; Lagarde, N. et al

in European Physical Journal Web of Conferences (2013, March 01)

A precise characterisation of the red giants in the seismology fields of the CoRoT satellite is a prerequisite for further in-depth seismic modelling. The optical spectra obtained for 19 targets have been ... [more ▼]

A precise characterisation of the red giants in the seismology fields of the CoRoT satellite is a prerequisite for further in-depth seismic modelling. The optical spectra obtained for 19 targets have been used to accurately estimate their fundamental parameters and chemical composition. The extent of internal mixing is also investigated through the abundances of Li, CNO and Na (as well as [SUP]12[/SUP]C/[SUP]13[/SUP]C in a few cases). [less ▲]

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See detailDifferential population studies using asteroseismology: Solar-like oscillating giants in CoRoT fields LRc01 and LRa01
Miglio, A.; Chiappini, C.; Morel, Thierry ULg et al

in European Physical Journal Web of Conferences (2013, March 01)

Solar-like oscillating giants observed by the space-borne satellites CoRoT and Kepler can be used as key tracers of stellar populations in the Milky Way. When combined with additional photometric ... [more ▼]

Solar-like oscillating giants observed by the space-borne satellites CoRoT and Kepler can be used as key tracers of stellar populations in the Milky Way. When combined with additional photometric/spectroscopic constraints, the pulsation spectra of solar-like oscillating giant stars not only reveal their radii, and hence distances, but also provide well-constrained estimates of their masses, which can be used as proxies for the ages of these evolved stars. In this contribution we provide supplementary material to the comparison we presented in Miglio et al. (2013) between populations of giants observed by CoRoT in the fields designated LRc01 and LRa01. [less ▲]

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See detailDevelopment of advanced models for transition to turbulence in hypersonic flows and prediction of transition under uncertainties
Serino, Gennaro ULg; Terrapon, Vincent ULg; Magin, Thierry et al

in Serino, Gennaro (Ed.) Review of the VKI Doctoral Research 2012-2013 (2013, March)

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See detailThe development and validation of nursing related groups based on the Belgian Nursing Minimum Dataset
THONON, Olivier ULg; VAN HERCK, Pieter; GILLAIN, Daniel ULg et al

in SHEERIN, Fintan; SERMEUS, Walter; EHRENBERG, Anna (Eds.) ACENDIO 2013 - Proceedings of 9th European Conference of ACENDIO (2013, March)

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See detailImpact of climate change on inundation hazard along the river Meuse
Dewals, Benjamin ULg; Drogue, Gilles; Erpicum, Sébastien ULg et al

in Transboundary Water Management in a Changing Climate (2013, March)

As a part of the effort to scientifically inform the development of the adaptation strategy for the Meuse basin, we detail hereafter the generation of integrated climate and hydrological scenarios for the ... [more ▼]

As a part of the effort to scientifically inform the development of the adaptation strategy for the Meuse basin, we detail hereafter the generation of integrated climate and hydrological scenarios for the whole basin. We also present the setup of a first coordinated hydraulic modelling from spring to mouth of the river Meuse. The latter has enabled to compute the range of change in inundation hazard under the “wet” transnational hydrological scenario for the time slices 2021-2050 and 2071-2100. A significantly higher impact of climate change has been found in the middle part of the Meuse basin, compared to the upper and the lower parts. These conclusions have been further confirmed by a refined analysis conducted for a 100 km-long stretch of the river Meuse crossing the Belgian-Dutch border. [less ▲]

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See detailA Verification-Based Approach to Memory Fence Insertion in PSO Memory Systems
Linden, Alexander ULg; Wolper, Pierre ULg

in Proceedings of the 19th international conference on Tools and algorithms for the construction and analysis of systems (2013, March)

This paper addresses the problem of verifying and correcting programs when they are moved from a sequential consistency execution environment to a relaxed memory context. Specifically, it considers the ... [more ▼]

This paper addresses the problem of verifying and correcting programs when they are moved from a sequential consistency execution environment to a relaxed memory context. Specifically, it considers the PSO (Partial Store Order) memory model, which corresponds to the use of a store buffer for each shared variable and each process. We also will consider, as an intermediate step, the TSO (Total Store Order) memory model, which corresponds to the use of one store buffer per process. The proposed approach extends a previously developed verification tool that uses finite automata to symbolically represent the possible contents of the store buffers. Its starting point is a program that is correct for the usual Sequential Consistency (SC) memory model, but that might be incorrect under PSO with respect to safety properties. This program is then first analyzed and corrected for the TSO memory model, and then this TSO-safe program is analyzed and corrected under PSO, producing a PSO-safe program. To obtain a TSO-safe program, only store-load fences (TSO only allows store-load relaxations) are introduced into the program. Finaly, to produce a PSO-safe program, only store-store fences (PSO additionally allows store-store relaxations) are introduced. An advantage of our technique is that the underlying symbolic verification tool makes a full exploration of program behaviors possible even for cyclic programs, which makes our approach broadly applicable. The method has been tested with an experimental implementation and can effectively handle a series of classical examples. [less ▲]

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See detailMulti-method monitoring of odor emissions in agricultural biogas facilities.
Nicolas, Jacques ULg; Adam, Gilles ULg; Ubeda, Yolanda et al

in Proceedings of the 5th IWA conference on odours and air emissions, San Francisco, USA, March, 4-7, 2013 (2013, March)

The production of farm-based biogas and electricity is an area of alternative-energy interest to many livestock producers. However, it is still insignificant in comparison to the maximum potential of ... [more ▼]

The production of farm-based biogas and electricity is an area of alternative-energy interest to many livestock producers. However, it is still insignificant in comparison to the maximum potential of farms all over the world. Market penetration should involve better confidence in the technique and better understanding of its possible assets and limits. For instance, is the environmental impact of biomethanation positive or negative? What are the possible ways to avoid or to control process imbalances? In the context of a European project, the research group attempted to tackle those questions under the angle of gas emission and more particularly of odor annoyance. A multi-method approach was applied to monitor biogas and odor emissions, both at the laboratory level on pilot plants and at real scale in 4 agricultural biogas facilities, in Belgium, Luxembourg, France and Germany. Results show that digested material is generally less odorant than crude manure or slurry, while preserving all the amendment and fertilizing qualities of the original material. Possible annoyance of agricultural biogas facilities in the surroundings remains limited and can be solved through simple techniques. [less ▲]

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See detail3. Contrôle des populations de mauvaises herbes
Jaunard, Delphine ULg; Monty, Arnaud ULg; Mahy, Grégory ULg et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail6. Lutte intégrée contre les maladies
Duvivier, Maxime; Mahieu, Olivier; Heens, B. et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail5. Les régulateurs de croissance
Meza Morales, Walter; Seutin, Benoît ULg; Monfort, Bruno et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail10. Environnement et gaz à effet de serre
Moureaux, Christine ULg; Aubinet, Marc ULg; Bodson, Bernard ULg

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail11. Perspectives - 2. La culture en association de froment et de pois: une opportunité pour réduire l'abondance des pucerons en été
Lopes, T.; Bodson, Bernard ULg; Francis, Frédéric ULg

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detail2. Implantation des cultures
Eylenbosch, Damien ULg; Pierreux, Jérome ULg; Dufranne, Delphine et al

in Bodson, Bernard; Destain, Jean-Pierre (Eds.) Livre Blanc - Céréales (2013, February 27)

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See detailObject-Based Approach and Tree-Based Ensemble Classifications for Mapping Building Changes
El Mansouri, Loubna ULg

in GEOProcessing 2013, The Fifth International Conference on Advanced Geographic Information Systems, Applications, and Ser vices (2013, February 24)

The aim of this paper is to efficiently detect and identify the building changes from newly registered very high spatial resolution (VHSR) image by comparing with outdated map. The whole process is ... [more ▼]

The aim of this paper is to efficiently detect and identify the building changes from newly registered very high spatial resolution (VHSR) image by comparing with outdated map. The whole process is performed mainly on four steps. First, the image was segmented to generate primitives, which are then represented by a feature vector composed from spectral, geometric, textural and contextual attributes. Thereafter, tree-based ensemble methods (Bagging, Random Forest and Extremely Randomized Trees) are used in a classification step. The final objects' prediction is deducted thanks to better classifier error rate. Last, a post classification change detection step allows to identify the segments which represent building changes. The data used in this research concerns the city of Rabat (Morocco). A Quickbird image has been used with an old map at the scale of 1:10,000. Regardless of the quality of the detected buildings' shape, the method achieves good rates of completeness (94%) and correctness (92%). [less ▲]

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See detailEffects of 3 months of controlled whole body vibrations with low exposure period on the risk of falls among nursing home residents
Beaudart, Charlotte ULg; Maquet, Didier ULg; Mannarino, Mélanie et al

in Proceeding of the meeting (2013, February 22)

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See detailFunctional screening of a metagenomic library from algal biofilms
Martin, Marjolaine ULg; Barbeyron, Tristan; Michel, Gurvan et al

in Smagghe, Guy; Boeckx, Pascal; Bossier, Peter (Eds.) et al Communications in Agricultural and Applied Biological Sciences (2013, February 08)

Macroalgae, and particularly their lignin-free polysaccharides, are increasingly used for their gelling and therapeutic properties and for the production of biofuels and renewable chemical compounds. To ... [more ▼]

Macroalgae, and particularly their lignin-free polysaccharides, are increasingly used for their gelling and therapeutic properties and for the production of biofuels and renewable chemical compounds. To extract, hydrolyze and purify this biomass, algae hydrolyzing enzymes are needed. Our work aims to identify and characterize algal biomass hydrolyzing enzymes expressed by microorganisms living on the surface of algae, by functional metagenomics. Therefore, a microbial DNA extraction method was developed to isolate the gDNA from the microorganisms of the brown algae Ascophyllum nodosum and a metagenomic library was constructed in Escherichia coli. The library was screened for diverse enzymatic activities (esterases, xylanases, cellulases, α-amylases, arabinanases, caseinases and β-glucosidases) on agar plates with specific enzymes substrates. Several new microbial enzymes (esterases, β-glucosidases, α-amylases and cellulases) were identified revealing the wealth of our library. Furthermore, those enzymes had less than 50% sequence identity with known protein sequences; meaning that our approach allows to identify new microbial enzymes expressed by uncultured microorganisms. Plate tests for medium-throughput screening of specific enzymes hydrolyzing algal polysaccharides (agarases, carrageenases and alginate lyases) are currently being developed. Our approach will probably allow us to identify new families of those ill-known enzymes, with particular enzymatic activities. [less ▲]

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See detailX-ray emission of interacting wind binaries in Cyg OB2
Nazé, Yaël ULg; Cazorla, Constantin ULg; Rauw, Grégor ULg

in EAS Publications Series (2013, February 01)

Cyg OB2 #5, #8A, and #9 are binary or multiple massive stars in the Cyg OB2 association displaying several peculiarities, such as bright X-ray emission and non-thermal radio emission. Our X-ray monitoring ... [more ▼]

Cyg OB2 #5, #8A, and #9 are binary or multiple massive stars in the Cyg OB2 association displaying several peculiarities, such as bright X-ray emission and non-thermal radio emission. Our X-ray monitoring of these stars reveals the details of their behaviours at high energies, which can be directly linked to wind-wind collisions (WWCs). In addition, the X-ray emission of Cyg OB2 #12, an evolved massive star, shows a long-term decrease, which could hint at the presence of a companion (with associated colliding winds) or indicate the return to quiescence of the star following a recent eruption. [less ▲]

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See detailInteracting winds in massive binaries
Rauw, Grégor ULg

in Pavlovski, Kresimir; Tkachenko, Andrew; Torres, Guillermo (Eds.) EAS Publications Series (2013, February 01)

Massive stars feature highly energetic stellar winds that interact whenever two such stars are bound in a binary system. The signatures of these interactions are nowadays found over a wide range of ... [more ▼]

Massive stars feature highly energetic stellar winds that interact whenever two such stars are bound in a binary system. The signatures of these interactions are nowadays found over a wide range of wavelengths, including the radio domain, the optical band, as well as X-rays and even γ-rays. A proper understanding of these effects is thus important to derive the fundamental parameters of the components of massive binaries from spectroscopic and photometric observations. [less ▲]

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See detailAn unexpected result for the V444 Cyg binary
Nazé, Yaël ULg; Lomax, J.; Hoffman, J.

in EAS Publications Series (2013, February 01)

V444 Cyg is a short-period (4 d) binary composed of two massive objects, a WN star and an O star. The winds of the two massive components collide, generating X-ray emission. A monitoring campaign in the ... [more ▼]

V444 Cyg is a short-period (4 d) binary composed of two massive objects, a WN star and an O star. The winds of the two massive components collide, generating X-ray emission. A monitoring campaign in the high-energy domain was performed using Swift and XMM-Newton, with surprising results on the collision geometry (wide shock opening angle, clear Coriolis deflection). Polarimetric data further help to understand the system properties. This new information places strong constraints on the physical parameters of the two stars. [less ▲]

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See detailLes clauses 'abusives' du contrat de travail
Kefer, Fabienne ULg; Mortier, Aurélie ULg

in Les clauses abusives dans les contrats usuels (2013, February 01)

Dans les relations de travail, l’équilibre du rapport contractuel s’établit par une conjugaison permanente des techniques du droit des obligations et de celles propres au droit du travail. L'article 1134 ... [more ▼]

Dans les relations de travail, l’équilibre du rapport contractuel s’établit par une conjugaison permanente des techniques du droit des obligations et de celles propres au droit du travail. L'article 1134 du Code civil ou la théorie de la cause sont autant de facteur de rééquilibrage du rapport contractuel que la liberté du travail ou les limitations du pouvoir potestatif de l'employeur. La sanction des clauses est également étudiées ainsi que les possiblités de renonciation à la protection légale. [less ▲]

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See detailChronische. Bronchitis Hund
Clercx, Cécile ULg

in Proceedings of the 34. Internationaler Fortbildungskurs Kleintierkrankheiten : “Thorax – Herz- und Lungenerkrankungen" - Flims -Switzerland (2013, February)

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See detailContexte géologique des sites mésolithiques de la Heid de Fer et de L’Ourlaine à Becco (Theux, Belgique)
Marion, Jean-Marc ULg; Simons, Justine; Mottequin, Bernard ULg

in Autour de l'hématite - Circulation et transformation au cours de la préhistoire récente. Méthodes d'analyse (2013, February)

The use of natural resources is a major source of information to study the socio-economic organization of the population from Prehistory to Antiquity, due to the fact that their exchange networks and ... [more ▼]

The use of natural resources is a major source of information to study the socio-economic organization of the population from Prehistory to Antiquity, due to the fact that their exchange networks and behaviors changed together with their lifestyles and know-how. If flint or other materials such as shale have been extensively studied, haematite, and particularly the oolitic haematite, remains hardly investigated as a material in terms of its origin and technical methods of utilization. The mesolithic sites of "L'Ourlaine" and the "Heid de Fer" (Becco, Theux, southern Belgium) are very close to an important Famennian (Upper Devonian) oolitic haematite outcrop. [less ▲]

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See detailOrthanc - Lightweight, scriptable DICOM server for image management in radiotherapy departments
JODOGNE, Sébastien ULg; Sobczak, Sonia; DEVILLERS, Magali ULg et al

in Proceedings of the Belgian Hospital Physicists Association Symposium (2013, February)

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See detailSur la voie de l’élevage laitier de précision en Wallonie - 2. ValLait, OptiVal et OptiVal+ : valoriser des données du contrôle des performances
Bastin, Catherine ULg; Gillon, A.; Massart, X. et al

in 18ème Carrefour des Productions agricoles: Nouvelles approches pour une optimisation de nos élevages laitiers (2013, February)

Detailed reference viewed: 21 (6 ULg)