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See detailThe Usability of Green Building Rating Systems in Hot Arid Climates
Attia, Shady ULg

in ASHRAE Energy & Indoor Environment for Hot Climates (2014, February 24)

To develop adaptable and context sensitive building rating systems, the present work aimed to evaluate four rating systems that emerged recently in the Middle East. Literature review and cross comparison ... [more ▼]

To develop adaptable and context sensitive building rating systems, the present work aimed to evaluate four rating systems that emerged recently in the Middle East. Literature review and cross comparison analysis showed that the four examined rating systems namely, Green Pyramid Rating System (Egypt), Green Building Standard SI 5281 (Israel), Qatar Sustainability Assessment System (QSAS) and Pearl Building Rating System (UAE) are not enough adopted to local environmental, cultural, historical, societal and economic context. They showed also a comparable similarity since they all imitate the American LEED and British BREEAM rating systems. The paper elaborates on the comparison results and presents recommendations to improve the questioned rating systems and remind designers with the principles and strategies of sustainable design that goes beyond the existing rating systems in hot climate. The evaluation of the four systems might provide a new approach for regional harmonization among the four systems and the development of adaptable and context sensitive rating system. [less ▲]

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See detailLe contrôle moteur lombopelvien du joueur de footbal élite
GROSDENT, Stéphanie ULg; Demoulin, Christophe ULg; Namurois, Guy et al

in Abstarct Book de la 1ère Journée Guy Namurois (2014, February 22)

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See detail1er Colloque Guy Namurois : Livre des résumés
Jidovtseff, Boris ULg; Halleux, Philippe; Lambert, Eric et al

in Jidovtseff, Boris (Ed.) 1er Colloque Guy Namurois : Livre des résumés (2014, February 22)

Colloque multi-disciplinaire en l'honneur de Guy Namurois

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See detailUtilisation d'une application internet pour quantifier la charge de travail chez le rugbyman de haut niveau
Paulus, Julien ULg; Laly, Arnaud; Guns, Sébastien et al

in Jidovtseff, Boris; Halleux, Philippe; Lambert, Eric (Eds.) Livre des résumés (2014, February 22)

La détection précoce du dépassement (over-reching) (et du syndrôme de surentrainement) est capitale compte-tenu de ses effets négatifs sur la performance. Dans ce processus, le contrôle individuel de la ... [more ▼]

La détection précoce du dépassement (over-reching) (et du syndrôme de surentrainement) est capitale compte-tenu de ses effets négatifs sur la performance. Dans ce processus, le contrôle individuel de la charge d'entrainement du joueur est indispensable. [less ▲]

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See detailPathologies des bétons: causes et effets
Courard, Luc ULg

in Evaluation des structures en béton (2014, February 20)

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See detailLes herbivores, transformateurs de produits fourragers et de coproduits issus de l'agro-industrie en aliments nobles pour l'homme
Decruyenaere, Virginie; Lessire, Françoise ULg; Beckers, Yves ULg et al

in CRA-W (Ed.) La viande bovine remise en question: De sa production à sa consommation (2014, February 19)

Les prairies recouvrent près de 50% de la surface agricole utile en Wallonie. Dans certaines régions, la prépondérance des prairies dans le paysage wallon se justifie par des contraintes climatiques. Pour ... [more ▼]

Les prairies recouvrent près de 50% de la surface agricole utile en Wallonie. Dans certaines régions, la prépondérance des prairies dans le paysage wallon se justifie par des contraintes climatiques. Pour celles-ci bien souvent, les sommes de température et la durée de végétation active sont faibles et limitent considérablement le choix des cultures susceptibles d’atteindre la maturité avant récolte avec certitude. Dans d’autres régions, les prairies s’imposent davantage en raison de contraintes agronomiques : nature du sol, disposition des parcelles, relief du territoire, intérêt dans la rotation pour les prairies temporaires… Ainsi, la grande majorité des prairies de notre Région ne peut pas être remplacée par des cultures ; elles doivent dès lors être perçues comme une bonne alternative à la valorisation du territoire. Grâce à la présence du rumen en amont de l’estomac, les ruminants ont la capacité de transformer des productions non éligibles pour l’homme, tels que les fourrages et les co-produits des industries agro-alimentaires. Ces aliments, de nature essentiellement fibreuse mais pas pour autant pauvres en protéine et en énergie, sont largement fermentés par les micro-organismes du rumen qui les dégradent en composés plus simples, valorisables ensuite par l’animal. Par ce mécanisme, les ruminants contribuent à transformer ces aliments grossiers en produits nobles, tels que le lait et la viande. On comprend dès lors aisément que la présence des ruminants est étroitement liée aux superficies enherbées, elles-mêmes dépendantes des conditions pédo-climatiques d’une région. Malgré des systèmes de production intensifs et l’amélioration continue du potentiel génétique des animaux, les bovins restent peu dépendants des aliments du commerce comparativement aux autres spéculations animales. Ainsi, selon l’APFACA, de l’ordre de 16% des aliments composés produits en Belgique et importés sont utilisés pour les bovins, dont seulement 1/3 est écoulé dans la filière viande bovine. L’herbe, les produits herbagers et les aliments produits sur l’exploitation tels que le maïs restent donc majoritaires dans la ration des bovins élevés pour la production de viande. La valorisation de l’herbe et des produits herbagers dépend fortement des performances zootechniques recherchées. Les objectifs de croissance sont établis, en autre, sur base des prix offerts par la cheville variant avec les catégories d’âge et de poids d’abattage. Ces dernières années, il semble que les animaux abattus un peu plus tardivement soient moins dépréciés qu’auparavant, facilitant la formulation de rations à base de matières premières herbagères. A l’inverse, l’intensification dans le but de produire des animaux abattus plus jeunes ou à un poids supérieur, implique une croissance plus soutenue, et de ce fait la distribution de rations plus denses en énergie. Pour la formulation de telles rations, certains coproduits disposent de valeurs nutritionnelles intéressantes, permettant de satisfaire des besoins nutritionnels élevés, tout en conservant une certaine autonomie alimentaire. Leur valorisation au niveau local représente en outre un intérêt considérable pour la rentabilité des industries agro-alimentaires qui, sans la présence de l’animal, devraient trouver d’autres débouchés pour les coproduits sous peine d’être dans l’obligation de financer leur élimination. Cet exposé a pour objectif d’illustrer les potentiels, mais aussi les limites, des aliments produits localement pour les bovins viande, que ce soit selon leur type (vache de réforme- taurillon…), leur race et leurs performances zootechniques, mais aussi l’intérêt de ces aliments en termes d’efficiences alimentaire et économique. Il analyse les atouts et faiblesses de la spéculation viande bovine en ne se limitant pas à l’échelle de l’animal seul, mais en le replaçant en tant que véritable maillon de la chaîne agro-alimentaire. Ce positionnement permet non seulement de mieux cerner les enjeux de ces élevages au niveau de la production primaire, mais aussi leur importance dans les secteurs amont et aval. [less ▲]

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See detailPaints based on renewable materials
Olive, Gilles ULg; Richel, Aurore ULg

in BOOK OF SHORT ABSTRACTS - POSTER PRESENTATIONS 19TH NATIONAL SYMPOSIUM ON APPLIED BIOLOGICAL SCIENCES (2014, February 07)

Paints, at the coating meaning, are known since a long time. Typically, paint is a dispersion of one or more powders (pigments and fillers) in a macromolecular substance ("resin"), called film-forming ... [more ▼]

Paints, at the coating meaning, are known since a long time. Typically, paint is a dispersion of one or more powders (pigments and fillers) in a macromolecular substance ("resin"), called film-forming material, diluted in solvents. Pigments are solid particles, used to give opacity and/or color. Today almost all pigments have a synthetic origin. The fillers are often natural compounds. Unlike pigments, fillers have low opacity and are colorless. These very cheap products achieve the required solid content under satisfactory economic conditions. Resins used in paints have the property of forming a continuous solid (hard or flexible) film under specific conditions. They are often called “resins”. They can be solid or liquid at room temperature. The solvents are used to control the viscosity of the paint in order to facilitate its production and application. The solvents used are volatile compounds. Additives are minor compounds (a few percent), whose function is to either promote or prevent some developments of the product. For example, surfactants improve the homogeneity of the dispersion. Some additives protect the film against mold or ultraviolet radiation, or against the formation of free radicals under the action of sunlight. Since the end of the 18th century most of those paints are petroleum-based. But the near disappearance of the petroleum causes a renewed interest in bio-based preparations. In this communication, we present an overview of bio-based alternatives. [less ▲]

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See detailOld inks: pigments extracted from plants
Despy, Jessica; Wymeersch, Noémie; Bouchat, Isabelle et al

in BOOK OF SHORT ABSTRACTS - POSTER PRESENTATIONS 19TH NATIONAL SYMPOSIUM ON APPLIED BIOLOGICAL SCIENCES (2014, February 07)

Thousands of years ago, natural pigments were discovered and they have been used ever since. Indeed, prehistoric people already used them to paint the walls of the caves in which they were living. A ... [more ▼]

Thousands of years ago, natural pigments were discovered and they have been used ever since. Indeed, prehistoric people already used them to paint the walls of the caves in which they were living. A significant example of this is the Cosquer cave (-19,000 to -27,000 years) located near Marseilles. Pigments and dyes can be classified into two broad categories and five families: natural pigments and dyes and those called artificial. The first one of these five families includes the mineral pigments. Among these we can find the clays (yellow ochre, red ochre, green clay, brown clay) and the stones like lapis lazuli (blue). The second and third families gather the organic dyes and pigments. Those that have vegetal origins like indigo (blue) and madder (red) compose the second family and those that have animal origins like cochineal (red) and kermes dyers (carmine) form the third family. One family includes pigments and dyes stemming from chemical reactions such as verdigris or red lead (family 4) and the other one is made of the miscellaneous inks such as iron-gall type who are vegetal and mineral one (family 5). All these pigments, although they have been used for centuries, have been replaced by synthetic dyes from the oil industry at the end of the 19th century. Indeed, they have the advantage of reproducibility of the properties unlike natural pigments. But the scarcity of oil causes a renewed interest in natural preparations. We report the extraction of pigments from plants. [less ▲]

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See detailExtensive spectroscopic and photometric study of HD 25558, a long orbital-period binary with two SPB components
Sódor, Á.; De Cat, P.; Wright, D. J. et al

in IAU Symposium (2014, February 01)

We carried out an extensive photometric and spectroscopic investigation of the SPB binary, HD 25558 (see Fig. 1 for the time and geographic distribution of the observations). The ~2000 spectra obtained at ... [more ▼]

We carried out an extensive photometric and spectroscopic investigation of the SPB binary, HD 25558 (see Fig. 1 for the time and geographic distribution of the observations). The ~2000 spectra obtained at 13 observatories during 5 observing seasons, the ground-based multi-colour light curves and the photometric data from the MOST satellite revealed that this object is a double-lined spectroscopic binary with a very long orbital period of about 9 years. We determined the physical parameters of the components, and have found that both lie within the SPB instability strip. Accordingly, both components show line-profile variations consistent with stellar pulsations. Altogether, 11 independent frequencies and one harmonic frequency were identified in the data. The observational data do not allow the inference of a reliable orbital solution, thus, disentangling cannot be performed on the spectra. Since the lines of the two components are never completely separated, the analysis is very complicated. Nevertheless, pixel-by-pixel variability analysis of the cross-correlated line profiles was successful, and we were able to attribute all the frequencies to the primary or secondary component. Spectroscopic and photometric mode-identification was also performed for several of these frequencies of both binary components. The spectroscopic mode-identification results suggest that the inclination and rotation of the two components are rather different. While the primary is a slow rotator with ~6 d rotation period, seen at ~60° inclination, the secondary rotates fast with ~1.2 d rotation period, and is seen at ~20° inclination. Our spectropolarimetric measurements revealed that the secondary component has a magnetic field with at least a few hundred Gauss strength, while no magnetic field was detected in the primary. The detailed analysis and results of this study will be published elsewhere. [less ▲]

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See detailCoMBiSpeC: A novel approach in the modelling of massive binaries
Palate, Matthieu ULg

in EAS Publications Series (2014, February 01)

Spectral modelling and especially for massive stars is not a straightforward problem and over the past decades many advances have been made in this field. We now have sophisticated model atmosphere codes ... [more ▼]

Spectral modelling and especially for massive stars is not a straightforward problem and over the past decades many advances have been made in this field. We now have sophisticated model atmosphere codes that allow to derive the stellar parameters. However, these codes are based on the assumption that the star is single and spherical which is no longer valid for the components of a binary system. On the other hand, observational studies indicate that binarity has an impact on the spectra. This is why we have developed a model called CoMBiSpeC (code of massive binary spectral computation) that specifically accounts for the impact of binarity on the spectra. [less ▲]

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See detailSpectroscopic survey of Kepler stars: high-resolution observations of A- and F-type stars
Niemczura, E.; Smalley, B.; Murphy, S. et al

in IAU Symposium (2014, February 01)

Basic stellar parameters such as effective temperature, surface gravity, chemical composition, and projected rotational velocity, are important to classify stars and are crucial for successful ... [more ▼]

Basic stellar parameters such as effective temperature, surface gravity, chemical composition, and projected rotational velocity, are important to classify stars and are crucial for successful asteroseismic modelling. However, the Kepler space data do not provide such information. Therefore, ground-based spectral and multi-colour observations of Kepler asteroseismic targets are necessary to complement the space data. For this purpose, in coordination with the KASC ground-based observational Working Groups, high-resolution spectroscopic data for more than 500 B, A, F and G-type stars were collected. [less ▲]

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See detailNovel fibroblast growth factor receptor 1 mutation causing normosmic idiopathic hypogonadotropic hypogonadism
Chachati, AS; Potorac, I; DEBRAY, François-Guillaume ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailMetal Enhanced Fluorescence: effect of surface coating
Lismont, Marjorie ULg; François, Alexandre; Dreesen, Laurent ULg et al

in SPIE proceeding (2014, February)

Among the emerging treatments for cancer, Photodynamic Therapy (PDT) is thought to be one of the most promising. PDT uses light sensitive molecules, or photosensitizer, to produce, under specific ... [more ▼]

Among the emerging treatments for cancer, Photodynamic Therapy (PDT) is thought to be one of the most promising. PDT uses light sensitive molecules, or photosensitizer, to produce, under specific irradiation, toxic reactive oxygen species (ROS) to kill cancer cells. However, the amount of ROS generated is limited by both the fluorescence lifetime of the photosensitizer and its concentration around the cancer cells. Metal Enhanced Fluorescence (MEF), a phenomenon arising when a fluorophore is in closed proximity to a metallic structure such as metallic films or nanostructures, is seen as a way to solve these problems by reducing the fluorescence lifetime and increasing the fluorescence emission of the fluorophore. Protoporphyrin IX (PpIX) is a commonly used photosensitizer to treat skin cancers, which presents an intense absorption band around 400 nm while emitting around 630 nm. Because silver nanoparticles (Ag NPs) exhibit a strong Localized Surface Plasmon Resonance (LSPR) around 400 nm, MEF of the PpIX is expected when immobilized onto Ag NPs. Here, we investigate the relevant parameters influencing the coupling effects between the LSPR in Ag NPs and PpIX attached onto the Ag NPs surface when the Ag NPs are dispersed in solution or electrostatically bound to a glass slide. In particular, we study the distance-dependent of MEF by applying multiple layers of polyelectrolyte to progressively increase the distance between Ag NPs and PpIX, covalently bond to the last polyelectrolyte layer as well as exploring the use of Ag NPs of different sizes ranging from 40 to 100 nm. [less ▲]

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See detailLe PPNAD, une cause rare de syndrome de Cushing
Petignot, S; VROONEN, Laurent ULg; HAMOIR, Etienne ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailCorrelations of the High Resolution MRI aspect of GH-secreting pituitary adenomas prior to treatment
Potorac, Iulia ULg; PETROSSIANS, Patrick ULg; Schillo, F et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailA stochastic framework for subspace identification of a strongly nonlinear aerospace structure
Noël, Jean-Philippe ULg; Schoukens, Johan; Kerschen, Gaëtan ULg

in Proceedings of the International Modal Analysis Conference (IMAC) XXXII (2014, February)

The present study exploits the maximum likelihood identification framework for deriving statistically-optimal models of nonlinear mechanical systems. The identification problem is formulated in the ... [more ▼]

The present study exploits the maximum likelihood identification framework for deriving statistically-optimal models of nonlinear mechanical systems. The identification problem is formulated in the frequency domain, and model parameters are calculated by minimising a weighted least-squares cost function. Initial values of the model parameters are obtained by means of a nonlinear subspace algorithm. The complete identification methodology is first demonstrated on a Duffing oscillator, prior to being applied to a full-scale aerospace structure. [less ▲]

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See detailA giant treated with growth hormone
Rostomyan, Liliya ULg; Potorac, Iulia ULg; Daly, Adrian ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailBacterial and viral pneumonia
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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See detailBronchiectasis
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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See detailEvaluation of the Response of Shear Critical Walls Using a Three-Parameter Kinematic Theory
Mihaylov, Boyan ULg; Hannewald, Pia; Beyer, Katrin

in The 4th International fib Congress 2014 Mumbai - Proceedings (2014, February)

This paper discusses a newly developed three-parameter kinematic theory (3PKT) for shear critical walls with the help of four wall tests. The 3PKT is used to predict the pre- and post- peak response of ... [more ▼]

This paper discusses a newly developed three-parameter kinematic theory (3PKT) for shear critical walls with the help of four wall tests. The 3PKT is used to predict the pre- and post- peak response of the test units. Comparisons are performed with finite element (FE) models and plastic hinge models in combination with a shear degradation model. It is found that the latter underestimate the displacement capacity of the walls while the former do not predict well the post-peak response. The 3PKT with only three degrees of freedom captures the complete response of the walls provided that the size of the critical loading zone (CLZ) of the wall is well predicted. [less ▲]

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See detailChronische Bronchitis Hund
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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See detailInternal Resonance and Stall-Flutter in a pitch-Flap Wing in the Wind-Tunnel
Verstraelen, Edouard ULg; Kerschen, Gaëtan ULg; Dimitriadis, Grigorios ULg

in Proceedings of the SEM IMAC XXXII (2014, February)

Nonlinear aeroelastic phenomena such as store-induced LCOs, transonic buzz and stall flutter are the burden or modern aircraft: they reduce the performance and can even limit the flight envelope in both ... [more ▼]

Nonlinear aeroelastic phenomena such as store-induced LCOs, transonic buzz and stall flutter are the burden or modern aircraft: they reduce the performance and can even limit the flight envelope in both civil and military cases. Several nonlinear setups were studied experimentally in the last decades by the scientific community but most of them have pitch and plunge degrees of freedom and feature a rigid wing. In this paper, we study a new nonlinear aeroelastic apparatus that features nonlinear pitch and flap degrees of freedom, coupled with a flexible wing. The model is tested experimentally in the wind tunnel to determine its dynamic behaviour. Preliminary observations demonstrate that the system undergoes a supercritical Hopf bifurcation due to the hardening nonlinearity followed by an amplitude jump that is the consequence of either dynamic stall (i.e. stall flutter) or internal resonance (i.e. interaction between the hardening nonlinearity and higher modes). [less ▲]

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See detailLong fibrosis
Clercx, Cécile ULg

in proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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See detailLiege acromegay Survey : An epidemiological study about the average age of death and the causes of mortality of acromegalic patients managed in liege
Petignot, S; PETROSSIANS, Patrick ULg; Daly, Adrian ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailClinical characteristics of patients with AIP mutation-related prolactinomas
Camby, S; Daly, Adrian ULg; VROONEN, Laurent ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailEffective stress method to be used in beam finite elements to take local instabilities into account
Franssen, Jean-Marc ULg; Cowez, Baptiste; Gernay, Thomas ULg

in Proceedings of the 11th IAFSS Symposium (2014, February)

In the fire situation, Bernoulli beam finite elements are the workhorse used in numerical calculation model for simulating the behaviour of the structure. Such finite elements treat all sections as class ... [more ▼]

In the fire situation, Bernoulli beam finite elements are the workhorse used in numerical calculation model for simulating the behaviour of the structure. Such finite elements treat all sections as class 1 (stocky) sections whatever the slenderness of the plates that make the section, allowing the development of a full plastic stress distribution in the section which leads to complete plastic redistribution along the members in the structure. This type of element is thus not adapted for modeling structures that contain slender sections of class 2, 3 or 4. This document presents a new approach to take into account local instabilities in slender sections using beam finite elements. The new approach is based on an effective constitutive law of steel. The effective law is not symmetrical with respect to tension and compression because, in tension, the stress-strain relationship is not modified whereas, in compression, the stress-strain relationship is modified. [less ▲]

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

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailIdentification of a Time-varying Beam Using Hilbert Vibration Decomposition
Bertha, Mathieu ULg; Golinval, Jean-Claude ULg

in Proceedings of the International Modal Analysis Conference (IMAC) XXXII (2014, February)

The present work is concerned by modal identification of time-varying systems. For this purpose, a method based on instantaneous frequency identification and synchronous demodulation is used to extract ... [more ▼]

The present work is concerned by modal identification of time-varying systems. For this purpose, a method based on instantaneous frequency identification and synchronous demodulation is used to extract modal components from recorded signals. The proposed method of iterated sifting process is based on the Hilbert Vibration Decomposition (HVD) technique which is used to extract the instantaneous dominant vibrating component at each iteration. A source separation preprocessing step is introduced to treat multiple degree-of-freedom systems in an optimal way. Sources are used as reference signals to get a single instantaneous frequency of each mode for the demodulation on all the channels. The algorithm is presented and is applied to numerical simulation of a randomly excited time-varying structure for illustration purpose. The investigated structure is made up of a beam on which a non-negligible mass is traveling. The variable location of the mass results in changes in modal parameters. [less ▲]

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See detailExamining wheat yield sensitivity to temperature and precipitation changes for a large ensemble of crop models using impact response surfaces"
Pirttioja, N.; Fronzek, S.; Bindi, Marco et al

in Rotter, Reimund; Ewert, Frank (Eds.) Modelling climate change impacts on crop production for food security - Abstract book (2014, February)

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See detailSubspace and nonlinear-normal-modes-based identification of a beam with softening-hardening behaviour
Grappasonni, Chiara ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the International Modal Analysis Conference (IMAC) XXXII (2014, February)

The capability to reproduce and predict with high accuracy the behaviour of a real system is a fundamental task of numerical models. In nonlinear structural dynamics, additional parameters compared to ... [more ▼]

The capability to reproduce and predict with high accuracy the behaviour of a real system is a fundamental task of numerical models. In nonlinear structural dynamics, additional parameters compared to classical linear modelling, which include the nonlinear coefficient and the mathematical form of the nonlinearity, need to be identified to bring the numerical predictions in good agreement with the experimental observations. In this context, the present paper presents a method for the identification of an experimental cantilever beam with a geometrically nonlinear thin beam clamped with a prestress, hence giving rise to a softening-hardening nonlinearity. A novel nonlinear subspace identification method formulated in the frequency domain is first exploited to estimate the nonlinear parameters of the real structure together with the underlying linear system directly from the experimental tests. Then a finite element model, built from the estimated parameters, is used to compute the backbone of the first nonlinear normal mode motion. These numerical evaluations are compared to a nonlinear normal modes-based identification of the structure using system responses to stepped sine excitation at different forcing levels. [less ▲]

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See detailDamage Detection in Civil Engineering Structure Considering Temperature Effect
Nguyen, Viet Ha; Mahowald, Jean; Maas, Stefan et al

in Proceedings of IMAC XXXII Dynamics of Coupled Structures (2014, February)

This paper concerns damage identification of a bridge located in Luxembourg. Vibration responses were captured from measurable and adjustable harmonic swept sine excitation and hammer impact. Different ... [more ▼]

This paper concerns damage identification of a bridge located in Luxembourg. Vibration responses were captured from measurable and adjustable harmonic swept sine excitation and hammer impact. Different analysis methods were applied to the data measured from the structure showing interesting results. However, some difficulties arise, especially due to environmental influences (temperature and soil-behaviour variations) which overlay the structural changes caused by damage. These environmental effects are investigated in detail in this work. First, the modal parameters are identified from the response data. In the next step, they are statistically collected and processed through Principal Component Analysis (PCA) and Kernel PCA. Damage indexes are based on outlier analysis. [less ▲]

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See detail7. Lutte intégrée contre les ravageurs
Chavalle, Sandrine; Censier, Florence ULg; Jacquemin, Guillaume et al

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc Céréales (2014, February)

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See detailHypopituitarism in pituitary gigantism (results of an international study)
Rostomyan, L; Daly, Adrian ULg; Shah, N et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailThe small Heat Shock Proteins (HSPs) response following eccentric exercise
Hody, Stéphanie ULg; Simonet, Arnaud; Lacrosse, Zoé ULg et al

in Abstract Book GIGA Day 2014 (2014, January 27)

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See detailSpray retention assment combining high-speed shadow imagery and fluorescence techniques
Massinon, Mathieu ULg; Boukhalfa, Hassina dite Hafida ULg; Lebeau, Frédéric ULg

in International Advances in Pesticide Application: Aspects of Applied Biology 122, 2014 (2014, January 08)

Droplet behaviour during impact affects retention by leaves. The increase of droplet adhesion to plant leaves is the objective when applying crop protection products, while droplet bouncing and ... [more ▼]

Droplet behaviour during impact affects retention by leaves. The increase of droplet adhesion to plant leaves is the objective when applying crop protection products, while droplet bouncing and fragmentation are usually seen as detrimental to spray retention. However, observation of droplet impacts on barley using high speed imaging showed that fragmentation impact outcome can occur in two different wetting regimes: Cassie-Baxter or Wenzel’s regime. In the latter, a fraction of the droplet is anchored in the surface roughness, what contributes to retention. Three mixtures were sprayed on excised barley leaves with an 11003 flat-fan nozzle operating at 0.2 MPa. Simultaneous measurements were performed using high speed imaging for droplet impact characterisation. A fluorescent tracer was added to the spray mixture for retention assessment. Retention was related to impact type considering the fraction of the droplet remaining on the leaf surface after a droplet splashing occurring in Wenzel’s wetting regime. This fraction varied from 28‒46% depending on the spray mixture and was correlated to the Volume Median Diameter DV0.5 of the impacting droplets. [less ▲]

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See detailNumerical Simulation of a Conical Shape Made By Single Point Incremental
Velosa De Sena, José ULg; Guzmán Inostroza, Carlos Felipe ULg; Duchene, Laurent ULg et al

in Incremental sheet forming (2014, January 06)

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See detailCompanion search around β Pictoris with the newly commissioned L'-band vector vortex coronagraph on VLT/NACO
Mawet, D.; Absil, Olivier ULg; Milli, J. et al

in Booth, Mark; Matthews, Brenda; Graham, James (Eds.) Exploring the Formation and Evolution of Planetary Systems (2014, January 01)

Here we present the installation and successful commissioning of an L'-band Annular Groove Phase Mask (AGPM) coronagraph on VLT/NACO. The AGPM is a vector vortex coronagraph made from diamond ... [more ▼]

Here we present the installation and successful commissioning of an L'-band Annular Groove Phase Mask (AGPM) coronagraph on VLT/NACO. The AGPM is a vector vortex coronagraph made from diamond subwavelength gratings tuned to the L' band. The vector vortex coronagraph enables high contrast imaging at very small inner working angle (here 0''.09, the diffraction limit of the VLT at L'), potentially being the key to a new parameter space. During technical and science verification runs, we discovered a late-type companion at two beamwidths from an F0V star (Mawet et al. 2013), and imaged the inner regions of β Pictoris down to the previously unexplored projected radius of 1.75 AU. The circumstellar disk was also resolved from ~= 1'' to 5'' (see J. Milli et al., these proceedings). These results showcase the potential of the NACO L-band AGPM over a wide range of spatial scales. [less ▲]

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See detailGeophysical Monitoring of Artificial Landslide Dam of Kambarata Hydro Power Plant-2 (Kyrgyzstan)
Torgoev, Isakbek; Havenith, Hans-Balder ULg; Torgoev, Almaz

in Landslide Science for a Safer Geoenvironment (2014, January 01)

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See detailThe VLTi/PIONIER survey of southern TTauri disks
Anthonioz, F.; Ménard, F.; Pinte, C. et al

in Booth, Mark; Matthews, Brenda; Graham, James (Eds.) Exploring the Formation and Evolution of Planetary Systems (2014, January 01)

Studying the inner regions of protoplanetary disks (1-10 AU) is of importance to understand the formation of planets and the accretion process feeding the forming central star. Herbig AeBe stars are ... [more ▼]

Studying the inner regions of protoplanetary disks (1-10 AU) is of importance to understand the formation of planets and the accretion process feeding the forming central star. Herbig AeBe stars are bright enough to be routinely observed by Near IR interferometers. The data for the fainter T Tauri stars is much more sparse. In this contribution we present the results of our ongoing survey at the VLTI. We used the PIONIER combiner that allows the simultaneous use of 4 telescopes, yielding 6 baselines and 3 independent closure phases at once. PIONIER's integrated optics technology makes it a sensitive instrument. We have observed 22 T Tauri stars so far, the largest survey for T Tauri stars to this date. Our results demonstrate the very significant contribution of an extended component to the interferometric signal. The extended component is different from source to source and the data, with several baselines, offer a way to improve our knowledge of the disk geometry and/or composition. These results validate an earlier study by Pinte et al. 2008 and show that the dust inner radii of T Tauri disks now appear to be in better agreement with the expected position of the dust sublimation radius, contrary to previous claims. [less ▲]

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See detailFirst High-Angular Resolution L' Images of the β Pictoris Debris Disc with the VLT / NaCo
Milli, Julien; Mawet, Dimitri; Absil, Olivier ULg et al

in Booth, Mark; Matthews, Brenda; Graham, James (Eds.) Exploring the Formation and Evolution of Planetary Systems (2014, January 01)

Imaging debris discs in the L'-band (3.8 μm) is a difficult task. Quasi-static speckles from imperfect optics prevail below 1'' whereas background emission is the dominant noise source beyond that ... [more ▼]

Imaging debris discs in the L'-band (3.8 μm) is a difficult task. Quasi-static speckles from imperfect optics prevail below 1'' whereas background emission is the dominant noise source beyond that separation and is much larger than at shorter wavelengths. We demonstrate here the potential of the newly commissioned AGPM coronograph on VLT/NaCo combined with advanced star and sky subtraction technique based on Principal Component Analysis, and we analyze the morphology of the β Pictoris disc. [less ▲]

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See detailTime-Resolved X-ray Spectroscopy of the Massive Binary delta Ori
Nichols, Joy S.; Nazé, Yaël ULg; Corcoran, M. F. et al

in American Astronomical Society Meeting Abstracts (2014, January 01)

We have obtained 500 ks of Chandra HETG observations of the massive binary delta Ori (O9.5II+unseen companion), one of the fundamental calibrators of the mass-luminosity-radius relation in the upper HR ... [more ▼]

We have obtained 500 ks of Chandra HETG observations of the massive binary delta Ori (O9.5II+unseen companion), one of the fundamental calibrators of the mass-luminosity-radius relation in the upper HR diagram. The program is intended to map the emission line parameters as the secondary moves through the wind of the primary star. Custom extraction techniques have been developed to create 12 time-resolved 40 ks spectra from these observations, each of which is properly calibrated for time and temperature effects. Emission line fluxes for these time slice spectra are presented, as well as phase analysis of the variability of the fluxes. We discuss the interpretation of the resulting data, such as colliding winds and occultation of various temperature regimes of the primary wind by the secondary. [less ▲]

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See detailHazard and risk related to earthquake-triggered landslide events
Havenith, Hans-Balder ULg

in Landslide Science for a Safer Geoenvironment (2014, January 01)

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See detailThe Delta Ori Very Large Project: X-ray Emission and Stellar Variability
Corcoran, Michael F.; Nichols, J. S.; Moffat, A. F. et al

in American Astronomical Society Meeting Abstracts (2014, January 01)

Delt Ori is the nearest massive, single-lined eclipsing binary (O9. II+OB, $P=5^{d}.7324$). High resolution X-ray spectrometry combined with high-precision photometry from space offers a unique ... [more ▼]

Delt Ori is the nearest massive, single-lined eclipsing binary (O9. II+OB, $P=5^{d}.7324$). High resolution X-ray spectrometry combined with high-precision photometry from space offers a unique opportunity to geometrically measure the dynamics of the shocked gas around the primary star. We summarize our recent campaign of phase-constrained high-resolution X-ray spectra obtained with the CHANDRA/HETGS plus high-precision optical photometry with MOST. These observations provide local measurement of the distribution of the embedded, X-ray emitting shocks in the wind of an O star via radial velocity variations and occultation effects, along with standard $f/i$ ratio diagnostics, and enable us to look for correlations with the broad-band photometric variability. We discuss how these observations can help determine the primary star's clumping-corrected mass loss rate, and resolve critical uncertainties in our understanding of the connection between stellar and mass loss parameters. [less ▲]

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See detailUnraveling the Mystery of Exozodiacal Dust
Ertel, S.; Augereau, J.-C.; Thébault, P. et al

in Booth, Mark; Matthews, Brenda; Graham, James (Eds.) Exploring the Formation and Evolution of Planetary Systems (2014, January 01)

Exozodiacal dust clouds are thought to be the extrasolar analogs of the Solar System's zodiacal dust. Studying these systems provides insights in the architecture of the innermost regions of planetary ... [more ▼]

Exozodiacal dust clouds are thought to be the extrasolar analogs of the Solar System's zodiacal dust. Studying these systems provides insights in the architecture of the innermost regions of planetary systems, including the Habitable Zone. Furthermore, the mere presence of the dust may result in major obstacles for direct imaging of earth-like planets. Our EXOZODI project aims to detect and study exozodiacal dust and to explain its origin. We are carrying out the first large, near-infrared interferometric survey in the northern (CHARA/FLUOR) and southern (VLTI/PIONIER) hemispheres. Preliminary results suggest a detection rate of up to 30% around A to K type stars and interesting trends with spectral type and age. We focus here on presenting the observational work carried out by our team. [less ▲]

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See detailReading the decomposition chemistry of human remains with a new pair of glasses
Stefanuto, Pierre-Hugues ULg; Stadler, s; Perrault, K et al

in Hyphenated Techniques in Chromatography HTC-13 - Book of abstracts (2014, January)

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See detailGC×GC-TOFMS identification of new cadaveric VOCs
Pesesse, Romain ULg; Stefanuto, Pierre-Hugues ULg; Stadler, S et al

in Hyphenated Techniques in Chromatography HTC-13 - Book of abstracts (2014, January)

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See detailL’associationnisme ethnique à l’épreuve du temps : étude de cas. Le Movimiento Asociativo de Emigrantes Españoles en Bélgica
Molina Marmol, Maïté ULg

in Actes des journée d’étude du 10 novembre 2011 « Immigration et troisième âge. Vieillir en migration, constats et solutions pour des populations silencieuses » (2014, January)

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See detailFast chromatographic method for explosives profiling
Stefanuto, Pierre-Hugues ULg; Perrault, K; Perrault, K et al

in Hyphenated Techniques in Chromatography HTC-13 - Book of abstracts (2014, January)

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See detailUse of rotary atomiser to optimize retention on barley leaves while reducing driftable droplets
Ouled Taleb Salah, Sofiene ULg; Massinon, Mathieu ULg; Boukhalfa, Hassina dite Hafida ULg et al

in International Advances in Pesticide Application, Aspects of Applied Biology 122 (2014, January)

Controlled Droplet Application using rotary atomiser is based on an improved control of droplet size and trajectory comparatively to hydraulic nozzles. On the basis of literature, it was stated that the ... [more ▼]

Controlled Droplet Application using rotary atomiser is based on an improved control of droplet size and trajectory comparatively to hydraulic nozzles. On the basis of literature, it was stated that the use of 60° forward angled spray combined with the narrow drop size distribution of a rotary atomiser could lead to low drift and high retention on monocotyledonous and superhydrophobic weeds at early stage. A Micromax120 atomiser was tuned to emit 270 µm VMD, 60° angled forward, to increase interception by the canopy structure. A spray mixture containing a superspreader adjuvant was used to avoid drop bouncing. An increase of spray retention comparatively to a Teejet 11002 at 1.4 bars was observed, although not proved statistically significant by these preliminary trials. On the drift side, the tilted spinning disc seemed to be advantageous since droplet spectra contains a low percentage of droplets under 100 µm and presents an ejection velocity of 25 m.s-1 at 5000 RPM. The spray drift was reduced about 50%. However, these setting were not found as efficient as expected. Indeed, angled spray proved to be more sensitive to advection and turbulence, as the spray was more exposed to the airflow than for the vertical position. It appears that angling the spray and choosing a drop size spectrum with a Volume Median Diameter as big as 270 µm is not sufficient to reduce significantly this issue. Some alternatives as decreasing the emission height are possible with angled sprays but require height control that seems difficult to reach in practical situations. [less ▲]

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See detailEnhanced Multivariate Analysis of Mainstream Tobacco Smoke Particulate Phase by HS-SPME-GC×GC-TOFMS
Brokl, Michal ULg; Bishop, L; Wright, c et al

in Hyphenated Techniques in Chromatography HTC-13 - Book of abstracts (2014, January)

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See detailIntroduction: Natural Dams and Landslides in Reservoirs
Strom, A.; Havenith, Hans-Balder ULg; Wang, F.

in Landslide Science for a Safer Geoenvironment (2014, January)

Abstract: Introduction describes briefly main problems that are highlighted in the papers selected for the C9 session of the WLF3 “Natural dams and landslides in reservoirs”. Various aspects of ... [more ▼]

Abstract: Introduction describes briefly main problems that are highlighted in the papers selected for the C9 session of the WLF3 “Natural dams and landslides in reservoirs”. Various aspects of interaction between water bodies and surrounding slopes and of the stability of natural and artificial dams are discussed... [less ▲]

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See detailUn approccio sociolinguistico allo studio dell’emigrazione campana in provincia di Liegi (Belgio)
Moreno, Paola ULg

in Di Salvo, Margherita; Moreno, Paola; Sornicola, Rosanna (Eds.) Multilinguismo in contesto migratorio. Metodologia e progetti di ricerca sulle dinamiche linguistiche degli italiani all'estero (2014, January)

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See detailLow noise vacuum-packaged MEMS closed-loop accelerometer using sixth-order multi-feedback loops and local resonator sigma-delta modulators
Chen, F; Yuan, W; Chang, H et al

in Proceedings of "IEEE MEMS Conf. : San Francisco- Janvier 2014" (2014, January)

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See detailAnalysis of POPs in 20μL blood by MEPS-GC-MS/MS
L'Homme, Benjamin ULg; Focant, Jean-François ULg

in Hyphenated Techniques in Chromatography HTC-13 - Book of abstracts (2014, January)

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See detailThe B Fields in OB Stars (BOB) Survey
Morel, Thierry ULg; Castro, N.; Fossati, L. et al

in IAU Symposium (2014)

The B fields in OB stars (BOB) survey is an ESO large programme collecting spectropolarimetric observations for a large number of early-type stars in order to study the occurrence rate, properties, and ... [more ▼]

The B fields in OB stars (BOB) survey is an ESO large programme collecting spectropolarimetric observations for a large number of early-type stars in order to study the occurrence rate, properties, and ultimately the origin of magnetic fields in massive stars. As of July 2014, a total of 98 objects were observed over 20 nights with FORS2 and HARPSpol. Our preliminary results indicate that the fraction of magnetic OB stars with an organised, detectable field is low. This conclusion, now independently reached by two different surveys, has profound implications for any theoretical model attempting to explain the field formation in these objects. We discuss in this contribution some important issues addressed by our observations (e.g., the lower bound of the field strength) and the discovery of some remarkable objects. [less ▲]

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See detailNuclear probes for battery materials investigations: Mössbauer spectroscopy, nuclear scattering, and neutron scattering
Hermann, Raphaël ULg; Mahmoud, A.; Brisbois, Magali ULg et al

in Proceedings of 2014 International Renewable and Sustainable Energy Conference, IRSEC 2014 (2014)

Selected examples of application of Mössbauer spectroscopy, nuclear resonance scattering of synchrotron radiation, and neutron scattering to battery and related materials research are presented. The ... [more ▼]

Selected examples of application of Mössbauer spectroscopy, nuclear resonance scattering of synchrotron radiation, and neutron scattering to battery and related materials research are presented. The charms of Mössbauer spectroscopy as a technique for screening materials, for detailed structure investigations, and for in situ measurements are illustrated. New developments of nuclear resonance scattering for isotopes with 30-90 keV resonant energy are presented. Structural, diffusive and dynamic studies utilizing neutron scattering are exemplified. © 2014 IEEE. [less ▲]

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See detailTowards sustainable neighbourhoods: a new handbook and its application
Marique, Anne-Françoise ULg; Teller, Jacques ULg

in Marchettini, M; Brebbia, C.A.; Pulselli, R.M. (Eds.) The Sustainable City IX : Urban Regeneration and Sustainability (2014)

This paper presents a practical handbook that aims at helping local authorities and private developers to build and assess “sustainable neighbourhoods” in Wallonia (Belgium). This handbook was developed ... [more ▼]

This paper presents a practical handbook that aims at helping local authorities and private developers to build and assess “sustainable neighbourhoods” in Wallonia (Belgium). This handbook was developed by the Research Centre on Territorial, Urban and Rural Sciences (Lepur, University of Liège), at the request of the Walloon Minister of the Environment, Spatial Planning and Mobility. The concrete aim of the handbook is to concretely define the concept of "sustainable neighbourhood" by clearly tagging the minimum criteria that a real estate project must meet to obtain the “sustainable neighbourhood” label in Wallonia. It is a tool for decision support in the design as well as the evaluation of real estate projects, since the early stages of their design. The handbook is structured into 5 main theme and 25 criteria of sustainability. In a broad vision of sustainability, this handbook is not strictly limited to energy issues but considers "sustainability" in all its multiple components: location, network connection, mobility of inhabitants, use of natural resources, landscaping, waste management, diversity of function, social interactions, among others. The handbook is firstly presented and, then, applied to 12 recent case studies in order to identify common invariants in the design process of “sustainable neighbourhoods” and barriers to the integration of cross-cutting principles of sustainability in neighbourhood projects. Our main results namely show that the criteria dealing with energy performance of buildings and green spaces have percolated in many cases. However, the diversity of housing types, the accessibility to handicapped peoples, social diversity and participation issues remain poorly addressed in most of the cases studies. [less ▲]

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See detailLOGIC : Un service GeoWeb d'aide à la décision et à la coopération des élus en matière d'implantations commerciales
Jaspard, Mathieu ULg

in 1ère Conférence Intercontinentale d'Intelligence Territoriale "Interdisciplinarité dans l'aménagement et développement des territoires" (2014)

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See detailComment Descartes et Leibniz (disent qu'ils) lisent les philosophes
Bouquiaux, Laurence ULg

in Les arts de lire des philosophes. Théorie et pratique de la lecture des textes chez les philosophes de l’âge classique (2014)

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See detailLes copies de la "Cène" de Léonard de Vinci
Fagnart, Laure ULg

in Mounier, Pascal; Nativel, Colette (Eds.) Copier et contrefaire à la Renaissance. Faux et usage de faux. Actes du colloque organisé par R.H.R. et la S.F.D.E.S. (2014)

Cette étude participe à une réflexion sur la notion de faux et de contrefaçon à la Renaissance, quand la copie d'une image n'est pas considérée comme un faux et que sa pratique même intervient dans la ... [more ▼]

Cette étude participe à une réflexion sur la notion de faux et de contrefaçon à la Renaissance, quand la copie d'une image n'est pas considérée comme un faux et que sa pratique même intervient dans la formation artistique. A cet égard, le cas des "copies" de la "Cène" de Léonard de Vinci s'avère éclairant : aucune des nombreuses reproductions anciennes de la peinture murale n'est considérée comme autographe, aucune ne reproduit exactement l'ensemble de la composition, toutes sortes de variations étant apportées par les artistes. Aussi, peut-on s'interroger sur le statut de ces reproductions infidèles qui interprètent la "Cène" plus qu'elles ne la copient. [less ▲]

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See detailAbundance study of two magnetic B-type stars in the Orion Nebula Cluster
Morel, Thierry ULg

in IAU Symposium 307 (2014)

We present the results of an abundance analysis of two magnetic B-type stars in the Orion Nebula Cluster that support the lack of a direct relationship between the existence of a magnetic field and a ... [more ▼]

We present the results of an abundance analysis of two magnetic B-type stars in the Orion Nebula Cluster that support the lack of a direct relationship between the existence of a magnetic field and a nitrogen excess in the photosphere. [less ▲]

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See detailSome potential problems of OHe composite dark matter
Cudell, Jean-René ULg; Khlopov, Maxim; Wallemacq, Quentin ULg

in Proceedings of the 17th Bled Workshop “What Comes Beyond the Standard Models?” (2014)

Among composite-dark-matter scenarios, one of the simplest and most predictive is that of O-helium (OHe) dark atoms, in which a lepton-like doubly charged particle O is bound with a primordial helium ... [more ▼]

Among composite-dark-matter scenarios, one of the simplest and most predictive is that of O-helium (OHe) dark atoms, in which a lepton-like doubly charged particle O is bound with a primordial helium nucleus, and is the main constituent of dark matter. This model liberates the physics of dark matter from many unknown features of new physics, and it demands a deep understanding of the details of known nuclear and atomic physics, which are still somewhat unclear in the case of nuclear interacting atomic shells. So far the model has relied on the dominance of elastic scattering of OHe with the matter. In view of the uncertainty in our understanding of OHe interaction with nuclei we study the opposite scenario, in which inelastic nuclear reactions dominate the OHe interactions with nuclei. We show that in this case all the OHe atoms bind with extra He nuclei, forming doubly charged O-beryllium ions, which behave like anomalous helium, causing potential problems with overabundance of anomalous isotopes in terrestrial matter. [less ▲]

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See detailAnalyse exploratoire des propriétés sémantiques et syntaxiques des verbes « psychologiques » (classe P) dans Les Verbes Français
Mazziotta, Nicolas ULg

in Née, Émilie; Daube, Jean-Michel; Valette, Mathieu (Eds.) et al Actes des 12es Journées internationales d’Analyse statistique des Données Textuelles (2014)

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See detailUncertainty quantification of the orbital lifetime of a LEO spacecraft
Dell'Elce, Lamberto ULg; Kerschen, Gaëtan ULg

in Proceedings of the Astrodynamics Specialist Conference (2014)

Orbital lifetime estimation is a problem of great timeliness and importance in astrodynamics. In view of the stochastic nature of the thermosphere and of the complexity of drag modeling, any deterministic ... [more ▼]

Orbital lifetime estimation is a problem of great timeliness and importance in astrodynamics. In view of the stochastic nature of the thermosphere and of the complexity of drag modeling, any deterministic assessment of orbital lifetime is likely to be bound to failure. This is why the present paper performs uncertainty quantification of satellite orbital lifetime estimation. Uncertainties in the initial state of the satellite and in the atmospheric drag force, as well as uncertainties introduced by modeling limitations associated with atmospheric density models, are considered. Mathematical statistics methods in conjunction with mechanical modeling considerations are used to infer the probabilistic characterization of these uncertainties from experimental data and atmospheric density models. Monte Carlo propagation is then exploited to achieve a probabilistic description of the orbital lifetime. [less ▲]

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See detailFrom centralization to local policies: design reform dynamics in Belgium and the creation of Antwerp's Higher Institute (1830-1914)
Prina, Daniela ULg

in Tradition, Transition, Trajectories: Major or Minor Influences? ICDHS 9th International Conference for Design History and Design Studies 2014, Conference Proceedings (2014)

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See detailHippocrate dans un monde de chrétiens : la réception des traités hippocratiques dans la chôra égyptienne à la période byzantine (284-641)
Marganne, Marie-Hélène ULg

in Jouanna, Jacques; Zink, Michel (Eds.) Hippocrate et les hippocratismes : médecine, religion, société. Actes du XIVe Colloque International Hippocratique (2014)

Dans le cadre d'une recherche sur la réception des œuvres des auteurs de l’antiquité classique dans l’Égypte christianisée, on examine les témoignages papyrologiques de la période byzantine relatifs aux ... [more ▼]

Dans le cadre d'une recherche sur la réception des œuvres des auteurs de l’antiquité classique dans l’Égypte christianisée, on examine les témoignages papyrologiques de la période byzantine relatifs aux traités hippocratiques, leur texte, leur mise en texte et leur contexte, en vue, non seulement de définir leur spécificité par rapport aux autres papyrus grecs médicaux et aux papyrus iatro-magiques de la même époque, mais aussi d’y déceler des traces éventuelles de copie ou d’utilisation en contexte chrétien. [less ▲]

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See detailAnalytic Model for The Motion About An Oblate Planet in The Presence Atmospheric Drag
Martinusi, Vladimir ULg; Dell'Elce, Lamberto ULg; Kerschen, Gaëtan ULg

in Advances in The Astronautical Sciences (2014)

The paper introduces a new model for the motion about an oblate planet under the influence of the atmospheric drag. Both qualitative and quantitative insights are revealed, as well as closed-form ... [more ▼]

The paper introduces a new model for the motion about an oblate planet under the influence of the atmospheric drag. Both qualitative and quantitative insights are revealed, as well as closed-form equations of motion. The main tool consists in averaging the effects of both perturbations (oblateness and drag), and deriving the variational equations for the vectorial orbital elements. The model is singularity-free and may serve as an initial guess for control problems, as well as an analytic propagator. [less ▲]

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See detailA Conceptual Event-Tree Model for Coseismic Landslide Dam Hazard Assessment
Fan, X.; Huang, R.; van Westen, C. et al

in Landslide Science for a Safer Geoenvironment (2014)

Abstract Earthquakes may trigger a series of multiple cascading geohazard phenomena. For example, coseismic landslides may block rivers and form landslide dams, which occur frequently in tectonically ... [more ▼]

Abstract Earthquakes may trigger a series of multiple cascading geohazard phenomena. For example, coseismic landslides may block rivers and form landslide dams, which occur frequently in tectonically active mountains with narrow and steep valleys. The catastrophic release of water masses from landslide-impounded lakes is capable to produce outburst floods and debris flows, causing loss of lives, housing and infrastructure. Quantifying the probability of these cascading phenomena following a triggering event has been a main ... [less ▲]

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See detailEtude longitudinale des besoins psychosociaux de personnes atteintes de cancer : Hiérarchisation et résolution de problème
Wagener, Aurélie ULg; Jonius, Bénédicte; DEVOS, Martine ULg et al

in Christophe, Véronique; Ducro, Claire; Antoine, Pascale (Eds.) Psychologie de la santé : Individu, famille et société (2014)

INTRODUCTION. L’existence et l’importance des besoins psychosociaux vécus par les conjoints de personnes atteintes de cancer ont été mises en évidence à plusieurs reprises. Afin de diminuer ces besoins ... [more ▼]

INTRODUCTION. L’existence et l’importance des besoins psychosociaux vécus par les conjoints de personnes atteintes de cancer ont été mises en évidence à plusieurs reprises. Afin de diminuer ces besoins, notre recherche-action teste l’efficacité de la combinaison de deux méthodes d’action : la hiérarchisation des besoins puis la résolution de problème ajustée à ces besoins. MÉTHODOLOGIE. Notre étude, longitudinale, randomisée, comporte trois temps d’évaluations séparés de trois semaines (T0, T1 et T2) et deux groupes (expérimental et contrôle). Au T0, les deux groupes réalisent la hiérarchisation des besoins. Entre T0 et T1, le groupe expérimental bénéficie de la résolution de problème. Entre T1 et T2, le groupe contrôle reçoit, à son tour, cette méthode. Les questionnaires administrés aux différents temps d’évaluation sont : données sociodémographiques, Hospital Anxiety and Depression Scale (HADS), Psychosocial Needs Inventory (PNI), questionnaire relatif au sentiment d’autoefficacité (GSES). HYPOTHESES. Entre T0 et T1, une amélioration générale des scores est attendue dans les deux groupes : celle-ci devrait s’avérer plus importante dans le groupe expérimental, ayant réalisé la résolution de problème. Entre T1 et T2, les scores du groupe contrôle, ayant alors pratiqué cette méthode, devraient s’améliorer et rejoindre ceux obtenus par le groupe expérimental au T1.RÉSULTATS. Trente-sept personnes ont accepté de participer : groupe expérimental (N=19, hommes=12, femmes=7) et groupe contrôle (N=18, hommes=11, femmes=7). Les groupes expérimental et contrôle présentent respectivement une moyenne d’âge de 59 et de 58 ans. Au T0, les scores moyens sur la HADS sont de 11,95 pour le groupe expérimental et de 13,94 pour le groupe contrôle ; le nombre moyen de besoins psychosociaux sur le PNI est de 29 dans les deux groupes ; les moyennes sur la GSES sont de 33,53 pour le groupe expérimental et de 32,33 pour le groupe contrôle. La récolte des données se poursuit et nous réaliserons des analyses de type ANOVA à mesures répétées afin d’évaluer les changements en fonction du temps (T0, T1 et T2) et du groupe (expérimental vs contrôle). [less ▲]

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See detailAnalysis of electrical resistance tomography measurements obtained in a bubble column: Dynamics aspects, first results
Fransolet, Emmanuelle; Crine, Michel ULg; L'Homme, Guy ULg et al

in Mann, R.; Mewes, D.; Ronson, P. (Eds.) Proceedings of 2nd World Congress on Industrial Process Tomography, Hanovre, Germany, 29-31 août 2001 (2014)

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See detailPatch repair: compatibility issues
Garbacz, Andrzej; Courard, Luc ULg; Bissonnette, Benoît et al

in Grantham, Michael; Basheer, Muhammed; Magee, Bryan (Eds.) et al Proceedings of the 5th International Conference on Concrete Repair (2014)

Repair of any concrete structure results in formation of complex, at least two-component repair systems. Compatibility approach is treated as a basic requirement during selection of repair material ... [more ▼]

Repair of any concrete structure results in formation of complex, at least two-component repair systems. Compatibility approach is treated as a basic requirement during selection of repair material. Recently, the understanding for compatibility requirements in repair systems approach is demonstrated in many papers. The aim of this paper is analyzing the compatibility between repair materials and concrete substrate in the case of patch repair. The compatibility issues were discussed in light of the various requirements which determine the mathematical space of loads, including chemical, mechanical and other physical (mainly thermal) loads. N-dimensional compatibility space is created, taking into account selected patch material control parameters. The requirements for good compatibility between repair material and concrete substrate can be formulated by using mathematical inequalities, where the variables are the material control parameters. The effects of properties of the both repair material and concrete substrate were analyzed using computer system ANCOMP developed at Warsaw University of Technology. Usability of this approach was demonstrated using selected case study as an example. [less ▲]

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See detailDescribing the ‘elusive’ : Availability, Preparation and Use of Anthocyanin Colourants in Mediaeval European Illuminators’ Workshops
Neven, Sylvie ULg; Sanyova, Jana

in Dubois, Hélène; Eyb-Green, Sigrid; Kroustallis, Stephanos (Eds.) et al Making and transforming art : changes in artists’ materials and practice (2014)

Anthocyanins are colorants which provide most of the blue, red and violet colours in numerous plants and fruits. Because of their great sensitivity to the slightest changes in pH and their instability in ... [more ▼]

Anthocyanins are colorants which provide most of the blue, red and violet colours in numerous plants and fruits. Because of their great sensitivity to the slightest changes in pH and their instability in ordinary daylight, it is generally thought that these colorants were used only to dye everyday clothes in a domestic context. However, medieval artists’ recipe books not only describe these elusive substances, but also indicate their use in illumination. This is notably the case for the texts of the so-called ‘Strasbourg Tradition’, written in the south of Germany and the north of France between 1400 and 1560, and partly composed from an older Alsatian treatise on illumination. Departing from these sources, this paper details the methods employed to prepare these colorants and (re)evaluates their diverse uses in painting and illuminating techniques. This technical data subsequently served as a basis upon which to make reconstructions. Finally, an attempt to correlate the information provided by these recipe books with specific artistic practices was carried out by collating the descriptions with the results of analyses from contemporary illuminations by an Alsatian workshop active in the same geographical area. [less ▲]

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See detailImage politique et rapports de farce: L'exemple de la "Daerdenmania"
Devresse, Jenifer ULg

in Veyrat-Masson, Isabelle; Denis, Sébastien; Sécail, Claire (Eds.) Sous les images, la politique... Presse, cinéma, télévision, nouveaux médias (XXe-XXIe siècle) (2014)

Narguant les douces utopies démocratiques projetées sur les dispositifs des NTIC, les nouvelles pratiques liées à l’Internet font la part belle au divertissement, et la politique n’y échappe guère ; en ... [more ▼]

Narguant les douces utopies démocratiques projetées sur les dispositifs des NTIC, les nouvelles pratiques liées à l’Internet font la part belle au divertissement, et la politique n’y échappe guère ; en témoigne notamment la fréquentation considérable des formes virtuelles du bêtisier politique (vidéos Youtube, etc.), devançant de loin celle des sites politiques ou citoyens. À cet égard, le cas de la « Daerdenmania » est particulièrement interpellant. Le socialiste belge Michel Daerden, baptisé « le Gainsbourg de la politique », connaît grâce à Internet une popularité internationale surprenante qui ne doit rien assurément à ses qualités proprement politiques, mais plutôt à ses qualités de pitre qui en font le héros d’une foultitude de plaisanteries. Or ce phénomène, bien plus qu’une exception à la belge, ne serait-il pas le révélateur d’un mouvement plus général, lié à une personnalisation du politique à la fois exacerbée et transfigurée par les usages émergents des NTIC ? L’exemple des images « daerdenmaniaques » permet d’explorer quelques modalités du rapport contemporain à la politique et témoignerait, non d’un renouveau de l’engagement citoyen dans les rapports de force politiques, mais au contraire d’un désengagement en termes de rapport de farce à la chose politique. En ce sens, ces formes communes de dérision signifieraient l’endormissement croissant de la possibilité du jugement critique, proprement politique, au profit d’une communauté émotionnelle. [less ▲]

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See detailMeandering jets in shallow rectangular reservoir
Peltier, Yann ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in 7th International Conference in River Hydraulics, River Flow 2014 (2014)

In this article, meandering flows in a shallow rectangular reservoir are experimentally and numerically investigated. Two experiments were performed in a smooth shallow horizontal flume and the surface ... [more ▼]

In this article, meandering flows in a shallow rectangular reservoir are experimentally and numerically investigated. Two experiments were performed in a smooth shallow horizontal flume and the surface velocity fields were measured by Large-Scale PIV (LSPIV). The flow conditions were chosen in such a way that the friction regime of both flows was different. These flows were then modelled using the academic code WOLF2D, which solves the 2D shallow water equations and uses a depth-averaged k- model for modelling turbulence. The main characteristics of the measured and simulated flows were finally extracted from a Proper Orthogonal Decomposition (POD) of the surface velocity fields and depth-averaged velocity fields respectively and were compared. When the mean fluctuating kinetic energy of the considered POD mode is greater than 1×10-5 m²/s², the numerical modelling and the experiments are in good agreement whatever the friction regime of the flow. [less ▲]

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See detailImplicit implementation of the Prevost model
Cerfontaine, Benjamin ULg; Charlier, Robert ULg

in Hicks, Michael A.; Brinkgreve, Ronald, R.J; Rohe, Alexander (Eds.) Numerical Methods in Geotechnical Engineering (2014)

The Prevost model for cohesionless soils (Prevost 1985) is currently used for the modelling of their cyclic behaviour, especially in earthquake engineering (Zerfa and Loret 2003) and (Yang and Elgamal ... [more ▼]

The Prevost model for cohesionless soils (Prevost 1985) is currently used for the modelling of their cyclic behaviour, especially in earthquake engineering (Zerfa and Loret 2003) and (Yang and Elgamal 2008). It’s made of conical yield surfaces that allow for plastic deformations in both loading and unloading. Its non-associated volumetric flow rule can roughly take into account pore pressure build-up and cyclic mobility. The method of implementation of a constitutive law is a crucial issue (Montáns and Caminero 2007) and (Mira et al. 2009). On one hand the accuracy of the solution must be ensured, especially when a large number of cycles are considered. But on the other hand, the cost of the computation must be minimized which implies step size as large as possible. In this paper, an implicit implementation of the Prevost model is proposed. The plastic flow rule is computed through a trapezoidal rule, at the time step n + 1/2, in order to increase the accuracy.An iterative process has to be solved, due to the implicit formulation.The Jacobian matrix of the internal Newton-Raphson process is computed analytically to enhance efficiency. The algorithm is implemented in the finite element code LAGAMINE that carries out fully-coupled analysis. Simulations of triaxial tests are compared with “exact” solution. [less ▲]

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See detailLes TICE dans les approches interculturelles en classe de FLE/S : Leviers ou obstacles dans l’apprentissage de l’écrit ? Pratiques déclarées et représentations d’enseignants de FLE/S en contexte universitaire
Dezutter, Olivier; Bleys, Françoise; Eid, Rodine et al

in EID, Cynthia; FADEL, Fady (Eds.) Les interculturalités, État des lieux et perspectives, théories et pratiques (2014)

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See detailSuperficie et emphytéose. Actualités législatives et jurisprudentielles
Lecocq, Pascale ULg

in Lecocq, Pascale (Ed.) Les droits réels démembrés (2014)

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See detailMise en ligne, mise à jour et mise en réseau du Französisches Etymologisches Wörterbuch
Renders, Pascale ULg

in Trotter, David; Bozzi, Andrea; Fairon, Cédrick (Eds.) Actes du XXVIIe Congrès international de linguistique et de philologie romanes (Nancy, 15-20 juillet 2013). Section 16 : Projets en cours; ressources et outils nouveaux (2014)

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See detailDrame et récit de l'événement : qu'arrive-t-il au lecteur ?
Servais, Christine ULg

in Brunner, Pascale; Elefante, Chiara; Stavroula, Katsiki (Eds.) et al Interpréter l'événement. Aspects linguistiques, discursifs et sociétaux (2014)

On analyse ici les manifestations discursives de la contradiction que constitue en soi, pour le discours médiatique, un événement, et ce en faisant porter l'interrogation sur le récepteur. Il s'agit de se ... [more ▼]

On analyse ici les manifestations discursives de la contradiction que constitue en soi, pour le discours médiatique, un événement, et ce en faisant porter l'interrogation sur le récepteur. Il s'agit de se demander comment le média relaie le choc que constitue l'événement en nouant ensemble deux affirmations : l'événement fait quelque chose au discours médiatique et celui-ci fait quelque chose au lecteur. Cette dimension performative du discours est soutenue par la déconstruction derridienne du signe linguistique et par la notion de "partage du sensible" de Jacques Rancière. [less ▲]

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See detailSTEREO MATCHING METHOD USING MULTIPLE ANGULAR SIGNATURES MATCHED BY MULTIDIMENSIONAL DYNAMIC TIMEWARPING (MD-DTW)
Grogna, David ULg; Guerri, Géraldine; Verly, Jacques ULg

in IEEE Xplore Digital Library (2014)

We consider the problem of matching interest points (IPs) extracted from the two images of a stereoscopic pair. We describe each IP via a descriptor consisting in one angular signature for a grayscale ... [more ▼]

We consider the problem of matching interest points (IPs) extracted from the two images of a stereoscopic pair. We describe each IP via a descriptor consisting in one angular signature for a grayscale image, three signatures for a color image, and, more generally, N signatures for N coregistered images of different modalities. Each angular signature is generated by spinning a “steerable x-tapered, y-derivative, half-Gaussian filter” 360° around each IP. The novel contribution of the paper is the use of multidimensional dynamic time warping (MD-DTW) for (1) producing a single, common warping for all pairs of corresponding signatures in the two descriptors of two IPs that are candidate for matching, and (2) for computing a single related distance between the two sets of signatures. Preliminary experimental results and a comparison with the results obtained with SIFT descriptors and matching via the smallest Euclidean distance in parameter space demonstrates the value of this novel approach. [less ▲]

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See detailThe gaia-ESO survey and massive stars
Blomme, R.; Fremat, Y.; Gosset, Eric ULg et al

in IAU Symposium 307 (2014)

As part of the Gaia-ESO Survey (GES), a number of clusters will be observed that were chosen speci cally for their massive-star content. We report on the procedures we followed to determine the stellar ... [more ▼]

As part of the Gaia-ESO Survey (GES), a number of clusters will be observed that were chosen speci cally for their massive-star content. We report on the procedures we followed to determine the stellar parameters from the massive-star spectra of this survey. We intercompare the results from the di erent techniques used by the nodes of our group to determine these parameters and discuss some of the problems encountered. We present preliminary results for NGC 6705, NGC 3293, and Trumpler 14. We study microturbulence in A-type stars, we use the repeat observation to investigate binarity, and we determine cluster membership from the radial velocity information. The large number of massive-star spectra obtained by the Gaia-ESO Survey will allow us to critically test stellar evolution modelling [less ▲]

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See detailCharacterization of olive cake production in northern Morocco
El Otmani, Samira; Ayadi, Mohammed; Chentouf, Mouad et al

in 1st FARAH Day, Faculty of Veterinary Medicine (2014)

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See detailLe Candide anglois: un cas complexe de "palimpseste"
Tilkin, Françoise ULg

in Cronk, Nicholas; Ferrand, Nathalie (Eds.) Les 250 ans de Candide. Lectures et relectures (2014)

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See detailThermoCycle: A Modelica library for the simulation of thermodynamic systems
Quoilin, Sylvain ULg; Desideri, Adriano ULg; Wronski, Jorrit et al

in Proceedings of the 10th International Modelica Conference 2014 (2014)

This paper presents the results of an on-going project to develop ThermoCycle, an open Modelica library for the simulation of low-capacity thermodynamic cycles and thermal systems. Special attention is ... [more ▼]

This paper presents the results of an on-going project to develop ThermoCycle, an open Modelica library for the simulation of low-capacity thermodynamic cycles and thermal systems. Special attention is paid to robustness and simulation speed since dynamic simulations are often limited by numerical constraints and failures, either during initialization or during integration. Furthermore, the use of complex equations of state (EOS) to compute thermodynamic properties significantly decreases the simulation speed. In this paper, the approach adopted in the library to overcome these challenges is presented and discussed. [less ▲]

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See detailEnergetical aspects of solar-like oscillations in red giants
Grosjean, Mathieu ULg; Dupret, Marc-Antoine ULg; Belkacem, Kevin et al

in Precision Asteroseismology, Proceedings of the International Astronomical Union, IAU Symposium, Volume 301 (2014)

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See detailPremière évaluation des impacts des poussières désertiques sur la santé des enfants en Afrique de l’Ouest : étude de cas dans le Bénin septentrional
De Longueville, Florence ULg; Henry, Sabine; Ozer, Pierre ULg

in Camberlin, Pierre; Richard, Yves (Eds.) Actes du 27e Colloque International de l'Association Internationale de Climatologie (2014)

Le Sahara est à l’origine de plus de la moitié des aérosols désertiques présents dans l’atmosphère. Ces aérosols terrigènes diminuent la visibilité horizontale et augmentent les concentrations en ... [more ▼]

Le Sahara est à l’origine de plus de la moitié des aérosols désertiques présents dans l’atmosphère. Ces aérosols terrigènes diminuent la visibilité horizontale et augmentent les concentrations en particules de taille inférieure à 10 µm (PM10), qui font partie de la catégorie des particules respirables. Un nombre croissant d’études démontrent des impacts significatifs des épisodes de poussières désertiques sur la santé mais aucune étude n’a été menée en Afrique de l’Ouest. Cette étude est la première qui vise à évaluer les impacts réels des aérosols sahariens sur la qualité de l’air et la santé respiratoire dans cette partie du monde. La combinaison de deux sources d’informations a permis de déterminer les épisodes de poussières ayant affecté la région de Kandi (Bénin septentrional) en saison sèche durant la période 2003-2007. Sur l’ensemble de cette période, 61 jours d’épisodes de poussières ont été notés. Les concentrations journalières en PM10 ont été multipliées par 18,5 lors de ces épisodes, ce qui contribue à dépasser de très loin les normes de l’OMS fixant un seuil de concentration annuelle maximale de 20 µg.m-3. Sur la base de données mensuelles de consultations des enfants pour infections respiratoires aiguës basses (IRAB), nous avons calculé une augmentation de 12,5% des taux mensuels d’IRAB dans la région de Kandi durant les mois ayant enregistré un épisode de poussières. Même si cette augmentation est loin d’être négligeable, elle apparaît relativement limitée par rapport aux impacts auxquels on pourrait s’attendre compte tenu des concentrations en PM10 atteintes. Ainsi, il est nécessaire de multiplier les recherches en Afrique de l’Ouest afin de mieux quantifier les impacts des aérosols désertiques sur la santé des populations qu’elle abrite. [less ▲]

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See detailEnseignant de langues : de l’homme-orchestre au chef d’orchestre. Etat des lieux d’une discipline et d’une profession en questionnement
Defays, Jean-Marc ULg

in Maurer, Marie-Thérèse (Ed.) « L’enseignant au sein du dispositif d’enseignement/ apprentissage de la langue étrangère », Actes du Ve de l’Association des Directeurs de Centres Universitaires d’Etudes Françaises pour Etrangers (ADCUEFE), Université de Bourgogne, Dijon, 27-28 mai 2011 (2014)

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See detailDistinction by micro-Raman spectroscopy and chemometrical analysis of copper phthalocyanine blue polymorphs in oil-based and acrylic samples
Defeyt, Catherine ULg; Van Pevenage, Jolien; Learner, Tom et al

in Van den berg, K.J.; Burnstock, A.; de Tagle, A. (Eds.) et al Issues in Contemporary Oil Paints (2014)

Copper phthalocyanine (CuPc) blue, commonly named phthalo blue is the most important synthetic organic blue pigment in the 20th and 21st century artists paints. Phthalo blue, which is adopted by artists ... [more ▼]

Copper phthalocyanine (CuPc) blue, commonly named phthalo blue is the most important synthetic organic blue pigment in the 20th and 21st century artists paints. Phthalo blue, which is adopted by artists since 1936, is a polymorphous pigment. Currently, the alpha, beta and epsilon CuPc polymorphs are used in artists paint formulations. The identification of the CuPc crystal form provides technical and chronological information relevant for studying artworks. Raman Spectroscopy (RS) is a very valuable technique for the detection of phthalo blue in paint layers. However, the spectral interpretation is not straightforward concerning the CuPc polymorph distinction. To overcome the problem we have previously developed a procedure combining RS and chemometrical analysis. The experimental results that we obtained have demonstrated its efficiency for predicting the CuPc crystal form in unknown paint samples. In the present work, this procedure was applied on oil-based and acrylic paints from Sam Francis’ studio and the Getty Conservation Institute (GCI) Reference Collection. [less ▲]

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See detailX-ray microtomography: A new tool to follow soft material shrinkage during convective drying
Léonard, Angélique ULg; Blacher, Silvia ULg; Marchot, Pierre ULg et al

in 2nd World Congress on Industrial Process Tomography : Hannover, Germany 29-31 août 2001 (2014)

X-ray microtomography is proposed as a new tool to investigate the shrinkage of soft material which occurs during convective drying. Reliable shrinkage curves are obtained with samples of wastewater ... [more ▼]

X-ray microtomography is proposed as a new tool to investigate the shrinkage of soft material which occurs during convective drying. Reliable shrinkage curves are obtained with samples of wastewater treatment sludge. We develop a four zones model to describe the drying kinetics based of the experimental data provided by X-ray microtomography. The observation of the drying and shrinkage curves allows us to determine 3 critical water content values, which define different drying zones where extragranular, intragranular or mixed limitations prevail. When drying is externally controlled, the decrease of the drying rate observed during experiments can be related to the reduction of the external area of the sample. © 2014 International Society for Industrial Process Tomography. [less ▲]

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See detailNGC 3293 revisited by the Gaia-ESO Survey
Semaan, Thierry ULg; Morel, Thierry ULg; Gosset, Eric ULg et al

in IAU Symposium 307 (2014)

In the framework of the Gaia-ESO survey we have determined the fundamental parame- ters of a large number of B-type stars in the Galactic, young ope n cluster NGC 3293. The determination of the stellar ... [more ▼]

In the framework of the Gaia-ESO survey we have determined the fundamental parame- ters of a large number of B-type stars in the Galactic, young ope n cluster NGC 3293. The determination of the stellar parameters is based on medium- resolution spectra obtained with FLAMES/GIRAFFE at ESO-VLT. As a second step, we adopted the acc urate parameters to determine the chemical abundances of these hot stars. We pre sent a comparison of our results with those obtained by the ’VLT-FLAMES survey of massive sta rs’ (Evans et al. 2005). Our study increases the number of objects analysed and provides an extended view of this cluster. [less ▲]

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See detailComparative analysis of the energy dissipation on a stepped spillway downstream of a Piano Key Weir
Silvestri, Aurélien ULg; Archambeau, Pierre ULg; Pirotton, Michel ULg et al

in Erpicum, Sébastien; Laugier, Frédéric; Pfister, Michael (Eds.) et al Labyrinth and Piano Key Weirs II - PKW 2013 (2014)

A systematic experimental study has been carried out to compare the residual energy at the toe of a stepped spillway of varied length considering a classical ogee-crested weir (OCW) or two different piano ... [more ▼]

A systematic experimental study has been carried out to compare the residual energy at the toe of a stepped spillway of varied length considering a classical ogee-crested weir (OCW) or two different piano key weirs (PKW) at the top of the structure. Four spillway lengths have been considered on a wide range of discharge. An indirect method has been used to compute the residual flow energy at the spillway toe from water depth measurements in a horizontal channel downstream. The results indicate that uniform flow conditions, i.e. flow energy at the spillway toe independent of the spillway length, are reached on significantly shorter spillways downstream of a PKW than downstream of an OCW. However, the uniform flow energy at constant discharge on the spillway is found to vary depending on the weir type. In particular, it is smaller downstream of the OCW than downstream of the PKWs. [less ▲]

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See detailLost and found: Rediscovery of de Ryckholt's collection of Cretaceous Mollusca (Belgium and N. France)
Fischer, Valentin ULg; Denayer, Julien ULg; Mottequin, Bernard ULg

in 4th International Palaeontological Congress, Mendoza, Abstracts volume (2014)

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See detailThe Relation Between The Food Price And The Climatic and Agricultural Factors In Republic of Niger
Andres, Ludovic ULg; Du Faux, Judith ULg; Lebailly, Philippe ULg

in Akın Olgun, F.; Kurtović, Mirsad; Filya, Ismail (Eds.) 25th International Scientific-Experts Congress on Agriculture and Food Industry : Book of abstracts (2014)

In the republic of Niger, the food price is very important for the farmers because the agricultural and livestock activities represent the main income of rural population. Furthermore, the temporary ... [more ▼]

In the republic of Niger, the food price is very important for the farmers because the agricultural and livestock activities represent the main income of rural population. Furthermore, the temporary disruptions (climate, environment) influence the food price. The target of this paper is to demonstrate the evolution of the millet current prices and the link between the prices and the annual temporary disruptions. The first factor is the monthly current prices of millet because it is the main food consumed by the rural population. The period taken into consideration is twenty years. The second factor is the annual precipitation and the number of raining days. The third factor is based on the millet production (production, yield, area). In the first time, we analyze the time series of monthly prices of millet with a mixed model. In the second time, an correlation compares the link between the “environmental” factors and the prices series. In conclusion, the time series studies of millet prices have demonstrated the cycle of these and their seasonality. Furthermore, the correlation has showed a difference between the studied factors and the millet prices. The main result is the demonstration of two time period: higher prices (May to August) and lower prices (October to January). [less ▲]

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See detailSimultaneous perturbation algorithms for batch off-policy search
Fonteneau, Raphaël ULg; Prashanth L.A.

in Proceedings of the 53rd IEEE Conference on Decision and Control (IEEE CDC 2014) (2014)

We propose novel policy search algorithms in the context of off-policy, batch mode reinforcement learning (RL) with continuous state and action spaces. Given a batch collection of trajectories, we perform ... [more ▼]

We propose novel policy search algorithms in the context of off-policy, batch mode reinforcement learning (RL) with continuous state and action spaces. Given a batch collection of trajectories, we perform off-line policy evaluation using an algorithm similar to that in [Fonteneau et al. (2010)]. Using this Monte-Carlo like policy evaluator, we perform policy search in a class of parameterized policies. We propose both first order policy gradient and second order policy Newton algorithms. All our algorithms incorporate simultaneous perturbation estimates for the gradient as well as the Hessian of the cost-to-go vector, since the latter is unknown and only biased estimates are available. We demonstrate their practicality on a simple 1-dimensional continuous state space problem. [less ▲]

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See detailDétermination des propriétés de couches minces dans le béton à l’aide d’un géoradar commercial à hautes fréquences: approche pic-à-pic et analyse fréquentielle du coefficient de réflexion
Van der Wielen, Audrey; Courard, Luc ULg; Nguyen, Frédéric ULg

in Balayssac, Jean-Paul (Ed.) Compte-rendus de Diagnobeton 2014 (2014)

The Ground Penetrating Radar (GPR) is an efficient tool for the non-destructive inspection of concrete structures. It is widely used for the detection of rebars or humid zones or for evaluating the ... [more ▼]

The Ground Penetrating Radar (GPR) is an efficient tool for the non-destructive inspection of concrete structures. It is widely used for the detection of rebars or humid zones or for evaluating the thickness of elements. But when an element contains a thin layer, the radar waves are submitted to multiple reflections on the interfaces and the layer appears in the radargram as a single reflection, whose detailed analysis can allow determining the thickness and the permittivity of the thin layer. Two approaches were considered in this paper. In the first one, the analysis is based on the peak-to-peak reflection amplitude. The second approach uses a frequency analysis of the reflection coefficient, whose amplitude and phase can then be calculated for several frequencies. With this method, the thickness and permittivity of the layer can in theory be simultaneously determined. Both methods were numerically validated through finite difference simulations and experimentally tested on concrete samples containing an air layer of variable thickness. We showed that the frequency analysis allowed to reach a higher precision in the parameters estimation for a limited additional computing cost. The method efficiency depends on the conditions and is optimal for layers with a high permittivity presenting a large contrast with the matrix. [less ▲]

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See detailRobust rendez-vous planning using the scenario approach and differential flatness
Dell'Elce, Lamberto ULg; Kerschen, Gaëtan ULg

in Advances in the Astronautical Sciences (2014)

There is a growing interest in uncertainty handling in the spacecraft dynamics community. In particular, robust optimization of spacecraft maneuvers is regarded as an important challenge. This paper ... [more ▼]

There is a growing interest in uncertainty handling in the spacecraft dynamics community. In particular, robust optimization of spacecraft maneuvers is regarded as an important challenge. This paper proposes an optimal control approach for orbital rendez-vous planning under stochastic dynamics and constraints. The method combines differential flatness theory with the scenario approach for optimization under uncertainties. By mapping state and control variables into a set of flat outputs, the enforcement of dynamics equations and boundary conditions is automatically satisfied. The rigorous foundations of the scenario approach lead to a finite-dimensional formulation of the problem which guarantees the feasibility of the solution within an arbitrary portion of the stochastic domain. The methodology is illustrated by means of two case studies involving a rendez-vous in elliptic orbit and a propellantless maneuver using differential drag, respectively. [less ▲]

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See detailEstetrol and neuroprotection against perinatal ischemic insult
Tskitishvili, Ekaterine ULg; Nisolle, Michelle ULg; Noël, Agnès ULg et al

in Estetrol attenuates neonatal hypoxic-ischemic brain injury (2014)

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See detailEvolution récente des extrêmes pluviométriques en Mauritanie (1933-2010)
Ozer, Pierre ULg; Hountondji, Yvon-Carmen; Gassani, Jean et al

in Camberlin, Pierre; Richard, Yves (Eds.) Actes du 27e Colloque International de l'Association Internationale de Climatologie (2014)

Un ensemble d’indicateurs a été compilé pour vérifier si la fréquence et/ou l’intensité des précipitations a significativement évolué au cours des dernières décennies dans la République Islamique de ... [more ▼]

Un ensemble d’indicateurs a été compilé pour vérifier si la fréquence et/ou l’intensité des précipitations a significativement évolué au cours des dernières décennies dans la République Islamique de Mauritanie. Cette étude s’appuie sur des indices nationaux basés les séries quotidiennes de précipitations de neuf stations synoptiques qui couvrent la période 1933-2010. L’analyse des précipitations a été réalisée en calculant annuellement treize indices pluviométriques : le total pluviométrique (PTOT), le nombre total de jours humides (précipitations ≥1 mm, JP), la lame d’eau moyenne précipitée par jour humide (Simple day intensity index, SDII), la pluviométrie maximale enregistrée sur 1 jour (Px1J), la fréquence des événements pluviométriques ≥ 10 mm (P10), ≥ 20 mm (P20), intenses (P95) et extrêmes (P99). Le poids relatif des cinq derniers indices dans le total pluviométrique annuel étant également apprécié. Les résultats montrent que les indices PTOT, JP, P10 et P20 présentent une tendance à la baisse significative sur la période 1933-2010. Dans le même temps, la fréquence des précipitations intenses et extrêmes évolue peu. De facto, la lame d’eau moyenne précipitée par jour humide (SDII) augmente de manière significative. Les résultats obtenus vont dans le sens des conclusions du Groupe d’expert intergouvernemental sur l’évolution du climat (Giec) à l’échelle globale, à savoir des précipitations extrêmes inchangées dans un contexte global de dessiccation. Selon de nombreux modèles, la dégradation pluviométrique pourrait s’amplifier dans les décennies à venir. Dès lors, des stratégies d’adaptation transfrontalières devraient être envisagées d’urgence car le processus de réchauffement de la planète n'est pas susceptible de diminuer dans les prochaines décennies. [less ▲]

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