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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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 detailValidation of differential drag propellantless maneuvers using 6 DoF simulations and stochastic dynamics
Dell'Elce, Lamberto ULg; Kerschen, Gaëtan ULg

in Proceedings of the 9th International ESA Conference on Guidance, Navigation & Control Systems (2014)

Differential drag is regarded as a promising technique in low-Earth orbits, since it allows to turn the often-undesired drag perturbation into a control force for relative maneuvers. Nonetheless, relevant ... [more ▼]

Differential drag is regarded as a promising technique in low-Earth orbits, since it allows to turn the often-undesired drag perturbation into a control force for relative maneuvers. Nonetheless, relevant uncertainties in drag modeling make its practical realization a challenge, especially if no other propulsive means is available to accommodate them. The main outcome of this study is the identification and characterization of the uncertainty sources affecting differential-drag-based maneuvers. This characterization is carried out by using statistical methods in conjunction with mechanical modeling considerations to infer a probabilistic model of the sources from observed data. The developments are illustrated in the framework of the QARMAN mission through high-fidelity simulations involving coupled attitude and orbital dynamics. [less ▲]

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See detailDu texte littéraire au document : les connexions entre les papyrus littéraires et documentaires grecs et latins
Marganne, Marie-Hélène ULg

in Derda, Tomasz; Urbanik, Jakub (Eds.) Actes du XXVIIe Congrès International de papyrologie (Varsovie, 29.07-03.08.2013) (2014)

Si l'on distingue généralement les papyrus littéraires et les papyrus documentaires grecs et latins, ces deux catégories présentent cependant, à côté du support, de l'écriture et des scribes, d'autres ... [more ▼]

Si l'on distingue généralement les papyrus littéraires et les papyrus documentaires grecs et latins, ces deux catégories présentent cependant, à côté du support, de l'écriture et des scribes, d'autres caractéristiques communes : certains papyrus paralittéraires présentent des traits documentaires ; d'autres papyrus sont trop fragmentaires pour être sûrement identifiés, soit comme littéraires, soit comme documentaires ; certains écrits comme les lettres et les discours peuvent, soit être liés à une profession ou à une circonstance particulière (documents), soit être fictifs (littéraires) ; des papyrus documentaires contiennent des citations ou des réminiscences littéraires ; des papyrus littéraires présentent un document sur l'autre face ; des papyrus littéraires font partie d'archives documentaires . Appliquant aux textes documentaires ou indéterminés la même grille d'analyse qu'aux textes littéraires, la nouvelle base de données du CEDOPAL permet de rendre compte de ces connexions et de les exploiter en vue de mieux évaluer les écrits concernés, les méthodes scribales mises en œuvre, ainsi que leur contexte de production et d'utilisation. [less ▲]

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See detailDe l'alimentation à la médecine : l'utilisation du vin dans les papyrus littéraires grecs et latins relatifs à la cuisine et à la médecine
Marganne, Marie-Hélène ULg

in de Haro Sanchez, Magali; Boudon-Millot, Véronique (Eds.) « Des grains et du vin dans l’Antiquité : entre aliments et médicaments ». Journée d’étude organisée le 17 mai 2013 à Paris, Maison de la Recherche (2014)

Unlike the Egyptians who produced and consumed wine and beer from the earliest times, the Greeks and Romans are known mainly as producers and drinkers of wine. This paper attempts to address the question ... [more ▼]

Unlike the Egyptians who produced and consumed wine and beer from the earliest times, the Greeks and Romans are known mainly as producers and drinkers of wine. This paper attempts to address the question of the use of wine in cooking and medical recipes on Greek and Latin literary papyri from Egypt (IV/III BC – VI/VII AD). Do these texts manifest a local influence through mentions of Egyptian wine or beer or do they refer only to Greek (after the conquest of Alexander the Great in 332 BC) and Italian (after the annexation to the Roman state in 30 BC) wines? Furthermore, this study lists the properties and functions ascribed to wine(s) in these writings. [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 detailImages de guerre dans quelques passions donatistes africaines
Fialon, Sabine ULg

in Coltellonoi-Trannoy; Le Bohec, Yann (Eds.) La guerre dans l'Afrique romaine sous le Haut-Empire (2014)

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See detailTsunamis triggered the Late Frasnian Kellwasser extinction event
Poty, Edouard ULg; Denayer, Julien ULg; Mottequin, Bernard ULg

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

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See detailThe harmonic balance method for advanced analysis and design of nonlinear mechanical systems
Detroux, Thibaut ULg; Renson, Ludovic ULg; Kerschen, Gaëtan ULg

in Proceedings of the SEM IMAC XXXII (2014)

As a tool for analyzing nonlinear large-scale structures, the harmonic balance (HB) method has recently received increasing attention in the structural dynamics community. However, its use was so far ... [more ▼]

As a tool for analyzing nonlinear large-scale structures, the harmonic balance (HB) method has recently received increasing attention in the structural dynamics community. However, its use was so far limited to the approximation and study of periodic solutions, and other methods as the shooting and orthogonal collocation techniques were usually preferred to further analyze these solutions and to study their bifurcations. This is why the present paper intends to demonstrate how one can take advantage of the HB method as an efficient alternative to the cited techniques. Two different applications are studied, namely the normal modes of a spacecraft and the optimization of the design of a vibration absorber. The interesting filtering feature of the HB method and the implementation of an efficient bifurcation tracking extension are illustrated. [less ▲]

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See detailÉvolution récente des précipitations de mars-mai en Afrique de l'Est: configurations spatiales et évolution sub-saisonnière
Philippon, Nathalie; Camberlin, Pierre; Moron, Vincent et al

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

Using raingauge daily rainfall data documenting the Horn of Africa and the Long Rains over the period 1961-2012, the aim of this study is three-fold:1/ confirming the drying trend detected by Lyon et ... [more ▼]

Using raingauge daily rainfall data documenting the Horn of Africa and the Long Rains over the period 1961-2012, the aim of this study is three-fold:1/ confirming the drying trend detected by Lyon et DeWitt (2012) during the Long Rains using gridded rainfall, 2/ understanding how this drying is expressed at the intraannual time scale using the sub-seasonal scenario approach developed by Moron et al. (2013) and 3/ assess its impact on vegetation. A drying is actually measured using raingauge data but is less severe than the one measured using gridded data. It is the strongest at the driest stations and during the rainfall climatological peak (April). It seems to be associated with a higher frequency of the dry subseasonal scenarios i.e. characterized by negative rainfall anomalies through the whole or the core of the seasonal cycle. But we don't observe yet a diminution of the vegetation photosynthetic activity in response to the rainfall decrease. To the contrary, the Rainfall Use Efficiency (RUE) displays a slightly positive trend. [less ▲]

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See detailSécheresse, migration et vulnérabilité à Djibouti-Ville
Ozer, Pierre ULg; Mahamoud, Ayan; Nour Ayeh, Moustapha et al

in Ozer, André; Ozer, Pierre (Eds.) Colloque International "La Géographie Physique et les Risques Naturels" - Livre de résumés (2014)

Ces dernières décennies, l’Afrique de l’Est souffre d’une longue et lente détérioration pluviométrique. De 2007 à 2011, la ville de Djibouti a enregistré un déficit de 73% des précipitations moyennes ... [more ▼]

Ces dernières décennies, l’Afrique de l’Est souffre d’une longue et lente détérioration pluviométrique. De 2007 à 2011, la ville de Djibouti a enregistré un déficit de 73% des précipitations moyennes annuelles par rapport à la moyenne de 30 ans (1981-2010). Cette sécheresse sans précédent va mettre de nombreuses familles des zones rurales (de Djibouti, d’Ethiopie et de Somalie) sur la route. Cette migration a pour point de chute la ville de Djibouti où des quartiers neufs se créent, comme Buldhuqo. Totalement inexistant en 2004, il explose après 2009. Les derniers arrivants s’installent dans le fond de l’oued, là même où la zone était inondée en 2004 et 2009 suite à des pluies courtes mais intenses. La prochaine pluie extrême, l’exposition de ces populations précaires aux risques hydrologiques sera maximale. Cette analyse montre que le déficit pluviométrique actuel est exceptionnel et historiquement unique. Les migrations importantes de population induites par cette sécheresse vers la ville de Djibouti doivent être encadrées, notamment lors de leur installation spontanée. Il est nécessaire de diminuer l’exposition aux risques hydrologiques de ces populations sinistrées, pour que les victimes de la sécheresse ne soient pas emportées par un excès pluviométrique. [less ▲]

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See detailModeling of Excavation Damaged Zone through the strain localization approach in Boom clay
Salehnia, Fatemeh ULg; Charlier, Robert ULg; Sillen, Xavier et al

in Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 (2014)

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See detailExperimental Study of the Human Ability to Deliberately Excite a Flexible Floor
Schwartz, Cédric ULg; Berger, Alexis; Bruls, Olivier ULg et al

in Zingoni, Alphose (Ed.) Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation (2014)

Human-structure interactions are not completely understood yet. This paper presents an experimental study focusing on the interaction between a human and a flexible support, with a major aim to better ... [more ▼]

Human-structure interactions are not completely understood yet. This paper presents an experimental study focusing on the interaction between a human and a flexible support, with a major aim to better understand how the behavior of a human subject, bouncing on a flexible structure, adapts to the support motion. Exploratory experiments are undertaken with a 7m-span timber footbridge tested in the Human Motion Analysis Laboratory of the University of Liege. The movements of the coupled system composed of the subject and the footbridge are recorded by Motion Capture technology; the subject\textquoteright{}s 3-D body motion is defined by three important angles: ankle, knee and hip. The interaction between the subject and the footbridge is also quantified by means of force platform measurements. The experiments indicate an influence of the support amplitude and natural frequency on the phase shift between the oscillatory floor motion and the three angles characterizing the motion. [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 detailAdhérence des réparations en béton: évaluation et facteurs d'influence
Bissonnette, Benoït; Courard, Luc ULg; Jolin, Marc et al

in Damidot, Denis (Ed.) Actes de la 15ème édition des journées scientifiques (2014)

La réparation et le renforcement des structures existantes en béton comptent parmi les plus importants défis auxquels les ingénieurs civils sont confrontés aujourd’hui et qu’ils devront relever dans les ... [more ▼]

La réparation et le renforcement des structures existantes en béton comptent parmi les plus importants défis auxquels les ingénieurs civils sont confrontés aujourd’hui et qu’ils devront relever dans les années à venir. Les préoccupations actuelles concernant le développement durable favorisent la réfection au détriment de la construction neuve et ne peuvent que renforcer cette tendance. Des efforts concertés de la part des scientifiques et ingénieurs sont encore nécessaires afin d’améliorer la conception des réparations en béton et d’en assurer la qualité et la fiabilité attendues. L’un des aspects essentiels de la durabilité des réparations en béton et des revêtements ou traitements de surface est la qualité de l’adhérence entre le matériau de réparation et le béton existant. Le présent article résume les principales conclusions de travaux réalisés en collaboration en vue d’identifier les facteurs influençant l’adhérence des réparations (la rugosité, le degré de saturation et la carbonatation du substrat) et l’évaluation de celle-ci en conditions in situ (type de chargement, alignement de l’appareil). Sur la base des résultats recueillis, des recommandations concernant la préparation de la surface avant réparation ont été émises dans un guide du USBR aux États-Unis. [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 detailEfficient estimation of the high-order response statistics of a wind-excited oscillator with nonlinear velocity feedback
Denoël, Vincent ULg; Carassale, Luigi

in Proceedings of the XIII Conference of the Italian Association for Wind engineering (2014)

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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 detailStratigraphy and depositionnal settings of the Late Famennian of Southern Belgium - a snapshot of the palaeoenvironment for late Devonian tetrapods and arthropods
Denayer, Julien ULg; Prestianni, Cyrille; Olive, Sébastien et al

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

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See detailNew finds of goniatite anaptychi from the Frasnian (Upper Devonian) of Belgium
Goolaerts, Stijn; Denayer, Julien ULg; Holemans, Tony et al

in Klug, Chritian; Fusch, Dirk (Eds.) 5th International Symposium Coleoid Cephalopods through Time, Abstracts and program (2014)

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See detailLe "basileion", les reines et Actium
Veymiers, Richard ULg

in Bricault, Laurent; Versluys, Miguel John (Eds.) Power, Politics and the Cults of Isis. Proceedings of the Vth International Conference of Isis Studies, Boulogne-sur-Mer, October 13-15 2011 (2014)

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See detailEffect of inhaled hysrosoluble curcumin in lipopolysaccharide-induced lung neutrophilia in horses
Sandersen, Charlotte ULg; Cerri, Simona ULg; Franck, Thierry ULg et al

in Dorothy Russel Havemeyer Foundation IAD Workshop (2014)

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See detailL'élevage des ruminants, un élément clé de notre territoire
Hautier, Louis; Campion, Morgane; Ninane, Maxime ULg et al

in Centre wallon de Recherches agronomiques (Ed.) 19ème Carrefour des Productions Animales "La viande bovine remise en question : de sa production à sa consommation", Gembloux, le 19 février 2014 (2014)

Parallèlement à l'extension de l'agriculture, l'élevage s'est développé pour la fourniture de produits alimentaires (lait, viande) et non alimentaires (cuir, laine) mais également par l'apport de la ... [more ▼]

Parallèlement à l'extension de l'agriculture, l'élevage s'est développé pour la fourniture de produits alimentaires (lait, viande) et non alimentaires (cuir, laine) mais également par l'apport de la traction animale aux agriculteurs et la restitution d'éléments fertilisants. Ceci a notamment contribué, dans nos régions, au développement du système à jachère et culture attelée. Au cours des dernières décennies, l'agriculture s'est fortement intensifiée grâce à l'énergie fossile utilisée pour la production d'intrants, de concentrés, la mécanisation et le transport des produits alimentaires. Cette intensification de l'agriculture au niveau mondial a conduit à la spécialisation des exploitations avec une dissociation de l'élevage et de la culture en bassins de production avec des conséquences très dommageables sur l'environnement. De nos jours, les productions bovines représentent 54 % des principales orientations technico-économiques en Wallonie, selon la nouvelle classification européenne (OTEX). L'élevage bovin en production est composé de 500 601 têtes : 41 % de laitières et 59 % d'allaitantes. Il est fortement basé sur la valorisation des prairies permanentes qui occupent plus de 45 % de la surface agricole utile et concerne plus de 86 % des exploitations agricoles wallonnes sur les 13 301 recensées en 2012.Toutefois, l'élevage est de plus en plus critiqué par la société à cause de ses impacts négatifs sur l'environnement et de considérations liées au bien-être animal.De plus, dans certaines exploitations, mise en concurrence des zones de grandes cultures avec les zones herbagères pour la production de lait et viande, difficultés et contraintes du métier d'éleveur. L'arrêt de cette activité pose la question du devenir de la surface agricole qui lui était allouée. Dans ce contexte, il paraît important de passer ici en revue les principaux services liés à l'élevage de ruminants en Wallonie afin d'identifier par la suite les conditions qui permettent l'optimisation de ces derniers tout en limitant les nuisances connexes et ceci dans le but d'objectiver la situation. [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 detailLe miroitement des mots
Verbeeck, Muriel ULg; Buyle, Marjan

in Buyle, Marjan (Ed.) Lustre et brillance en conservation-restauration - Glans in de conservait-restauratie (2014)

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See detailImproving the Energy Efficiency of the Building Stock: A Bottom-up Model and its Application in an Online Interactive Portal
Cuvellier, Simon; Marique, Anne-Françoise ULg; Reiter, Sigrid ULg

in Proceedings of PLEA 2014 (2014)

There is an urgent need to reduce energy uses in new and retrofitted buildings. In Europe, energy consumption in the building sector still represents more than 40% of the final energy use. Emerging ... [more ▼]

There is an urgent need to reduce energy uses in new and retrofitted buildings. In Europe, energy consumption in the building sector still represents more than 40% of the final energy use. Emerging countries are also concerned by such issues at even wider levels because of the huge demographic growth they are witnessing. Numerous research studies have highlighted the need to produce more efficient buildings, but also to retrofit the existing building stock. However, research methods and tools that allow a precise quantification of energy uses in buildings and energy savings related to various actions (insulating the roofs, changing the glazing, behavioral changes, etc.) are mainly dedicated to trained professional users, thus neglecting the huge potential energy savings that is linked to individual actions undertaken by citizens in their dwellings. In this context, the main aim of our research is to raise awareness of energy efficiency in residential buildings and encourage positive changes to the energy efficiency of the building stock, starting at the individual scale. This paper first presents the methodology that allows a precise energy assessment (heating, cooling, ventilation, lighting, appliances and cooking) of buildings (at the house, neighborhood, city and region scales) on the basis of a “bottom-up” approach. This methodology uses a typological classification of buildings, thermal simulations and local surveys. In this paper, this methodology is applied to the Walloon (Belgium) building stock. Many parameters are defined and taken into account to capture the specificities of numerous types of buildings (e.g., the number of floors, common ownership, orientation, thermal performances, ventilation, etc.). Several occupation modes are modelled to capture the impact of occupants’ behavior on energy consumption. To take into account the impact of urban form, correction factors are defined and applied according to the type of neighborhoods in which the buildings are located. All things considered, 250,000 individual results are obtained and stored in a huge database. Linear extrapolations and correction factors are used to extrapolate and apply these results to any type of residential building in Wallonia. This methodology is then used to develop an online portal that aims to strengthen citizens’ awareness of the necessity for ecological changes in the building sector and encourage individual actions to improve the energy efficiency of buildings. This tool allows for a transfer of the main results of a two-year scientific research effort to citizens in a very simple and intuitive way. Although the results presented in this paper are focused on Wallonia (Belgium), the research is easily reproducible to other territories by adapting local parameters. [less ▲]

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See detailConcrete repair bond: evaluation and factors of influence
Bissonnette, Benoît; Courard, Luc ULg; Garbacz, Andrzej et al

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

Repair and strengthening of existing concrete structures are among the biggest challenges civil engineers are facing today and will have to face in the years to come. Present concerns of sustainable ... [more ▼]

Repair and strengthening of existing concrete structures are among the biggest challenges civil engineers are facing today and will have to face in the years to come. Present concerns of sustainable development emphasizing repair instead of new construction will only strengthen this trend. Concerted efforts towards improving the durability of concrete repairs are still needed from scientists and engineers. One of the critical aspects of durability of concrete repairs and overlays is lasting and sufficient interfacial bond between repair material and existing concrete substrate. This paper summarizes some of the findings of a collaborative study devoted to the most significant factors influencing bond in repairs (roughness, degree of saturation and carbonation of the substrate) and its field evaluation (type of loading, device misalignment). Based on the test results collected in different test programs, guideline-type recommendations for surface preparation prior to repair were issued. [less ▲]

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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 detailBronze Age Domestic Architecture in Eastern Syria : Familiar, Social and Economic Implications
Mas, Juliette ULg

in Bieliński, P.; et al. (Eds.) Proceedings of the 8th International Congress on the Archaeology of the Ancient Near East, 30 April – 4 May 2012, University of Warsaw, Volume 1: Plenary Sessions, Township and Villages, High and Low – The Minor Arts for the Elite and for the Populace (2014)

This paper deals with a PhD project on domestic architecture and society on the Syrian Euphrates region and in the Jezirah during the Bronze Age. The large geographical and chronological framework allowed ... [more ▼]

This paper deals with a PhD project on domestic architecture and society on the Syrian Euphrates region and in the Jezirah during the Bronze Age. The large geographical and chronological framework allowed to collect an important corpus of houses. The analysis of statistical data on their different features allowed interpretations, in particular concerning their functionnal characteristics. The attention is here focused on the crafts and industrial production of the house inhabitants. The contemporary economic system is well known in Southern Mesopotamia, and was there mainly based on official oikoi linked to the temples or to the palace. On the contrary, the analysis of Northern Mesopotamian evidence shows that the economic system in this area was mainly based on private households, the state control probably being there of lesser importance. [less ▲]

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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 detailArbitrage et ordre public européen
Caprasse, Olivier ULg

in Loquin, E.; Manciaux, S. (Eds.) L'ordre public et l'arbitrage (2014)

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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 detailCharacterization of Particle Damage and Surface Exposure of a Copper Ore Processed by Jaw Crusher, HPGR and Electro-dynamic Fragmentation
Da Fonseca Martins Gomes, Otavio ULg; Monteiro de Oliveira, Debora; Santos Sobral, Luis Gonzaga et al

in Carpenter, John; Bai, Chenguang; Hwang, Jiann-Yang (Eds.) Characterization of Minerals, Metals, and Materials 2014 (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 detailDurability of hydrophobic treatments on concrete monuments
Courard, Luc ULg; Lucquiaud, Vincent ULg; Gérard, Olivier et al

in Proceedings of 7th International Conference on Water Repellent Treatment and Protective Surface Technology for Building Materials (2014)

The protection of concrete historical structures is a challenge for the coming years. Hydrophobic treatment may induce a delay in degradations progress as well as a protection against water penetration ... [more ▼]

The protection of concrete historical structures is a challenge for the coming years. Hydrophobic treatment may induce a delay in degradations progress as well as a protection against water penetration. Existing products - mainly silane and siloxane based – have been submitted to different ageing processes including UV radiation, moistening cycles, thermal shocks, freeze-thaw cycles, carbonation and efficiency has been evaluated on the base of contact angle, vapour and chloride permeability and, capillarity absorption. Investigation results clearly show a good behaviour of hydrophobic treatments under main ageing conditions. [less ▲]

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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 detailCompatibility of using TiO2 and the faecal near-infrared reflectance spectrometry for estimation of cattle intake
Vandermeulen, Sophie ULg; Decruyenaere, Virginie; Ramirez-Restrepo, Carlos Alberto et al

in Hopkins, A; Collins, RP; Fraser, MD (Eds.) et al EGF at 50: the future of European Grasslands. Proceedings of the 25th General Meeting of the European Grassland Federation, Aberystwyth, Wales, U.K., 7 - 11th September 2014 (2014)

Combining titanium dioxide (TiO2) as indigestible marker to faecal near-infrared reflectance spectrometry (F-NIRS) can be used to determine cattle feed intake and quality of ingested forage if F-NIRS ... [more ▼]

Combining titanium dioxide (TiO2) as indigestible marker to faecal near-infrared reflectance spectrometry (F-NIRS) can be used to determine cattle feed intake and quality of ingested forage if F-NIRS spectra are not modified by the marker. This study aimed at determining the compatibility of TiO2 with F-NIRS. Three dry cows were fed a standard hay-based diet for three weeks supplemented with a daily dose of 0.1 % (10g) TiO2 during the last two weeks of the experiment. Faeces samples were collected every day and analysed for TiO2 and F-NIRS. Results suggest that TiO2 did not interfere with F-NIRS analyses. The calculations of crude protein, NDF, ADL contents, as well as dry matter intake did not change over time with increasing TiO2 in the faeces (P > 0.05). Slight differences observed for other predicted parameters seemed to be independent from TiO2. The higher Mahalanobis distance (H) for chemical composition (H = 7.2) independent from TiO2 inclusion could indicate that faecal spectra did not correspond exactly to the prediction database. Although 0.1% incorporation of TiO2 seem not to interfere with F-NIRS measurements, caution must be taken with higher levels of TiO2 as nothing indicates that interference could not appear. [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 detailDevonian to Basal Permian Lithostratigraphy in Southwestern Hakkari: A Perspective from Northern Arabian Mixed Carbonate–Siliciclastic Platform
Hosgör, Izzet; Yilmaz, Ismail Omer; Gourvennec, Remy et al

in AAPG International Conference & Exhibition Istanbul 2014 (2014)

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See detailL’Alfier nero (Le Fou noir) d’Arrigo Boito – Lecture anthropologique et poétologique d’un combat d’échecs.
Leyh, Valérie ULg

in Achim Küpper, Kristine Vanden Berghe (Ed.) Guerre et jeu. Cultures d’un paradoxe à l’ère moderne (2014)

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See detailAnalysis of mass movements affecting the region of Constantine
Draidia, Salah ULg; Havenith, Hans-Balder ULg; Benabbas, C.

in EGU General Assembly Conference Abstracts (2014)

Abstract: Mass movements are a very frequent phenomenon in the North-Eastern Algeria, causing a lot of damages among the population and on the infrastructures and representing the most important geohazard ... [more ▼]

Abstract: Mass movements are a very frequent phenomenon in the North-Eastern Algeria, causing a lot of damages among the population and on the infrastructures and representing the most important geohazard. This paper presents some results of the analysis of slope instabilities in many places in the region and especially along the East-West highway. The work show many types of failures characterized by a high degree of heterogeneity. It is clear that the landslides in this area are very complex, in the most cases a combination of ... [less ▲]

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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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See detailImages et rôles du professeur de langues dans le cadre de la mondialisation. Le cas de la mobilité étudiante européenne
Defays, Jean-Marc ULg; Meunier, Deborah ULg

in Bento, Margaret; Spaëth, Valérie (Eds.) Contexte global et contextes locaux : tensions, convergences et enjeux en didactique des langues (2014)

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See detailAxisymmetric transient modelling of a suction caisson in dense sand
Cerfontaine, Benjamin ULg; Levasseur, Séverine ULg; Collin, Frédéric ULg et al

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

Suction caisson are hollow cylinders open towards the bottom that are currently used as anchors for deep water offshore facilities. They recently turned out to be advantageously exploited as foundation ... [more ▼]

Suction caisson are hollow cylinders open towards the bottom that are currently used as anchors for deep water offshore facilities. They recently turned out to be advantageously exploited as foundation for offshore wind turbines in shallow water (Senders 2009). The Prevost model for cohesionless soils (Prevost 1985) is currently used for the modelling of their cyclic behaviour. It’s able to reproduce plastic deformation in both loading and unloading, contractancy of the soil and pore pressure build up as well. In this paper, a fully- coupled transient axisymmetric analysis of a suction caisson is carried out. A vertical pseudo-random loading is transformed into equivalent ones. Comparison of the permanent displacement accumulated shows a good agreement between them. The influence of the interface conditions is also addressed. For low tension amplitude applied to the caisson, it can be modelled as “stuck” to the inner soil. However higher amplitude might lead to a total unplugging. [less ▲]

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See detailThe Hangenberg Event (uppermost Famennian) in southern Belgium (Namur-Dinant Basin)
Mottequin, Bernard ULg; Poty, Edouard

in Cerdena, Esperanza (Ed.) 4th International Palaeontological Congress, Abstract Volume (2014)

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See detailLe référentiel quartiers durables : un nouvel outil d'aménagement durable en Wallonie
Marique, Anne-Françoise ULg; Teller, Jacques ULg

in 2èmes Rencontres de l'Urbanisme Durable : Retour d'expériences (2014)

Après une phase d’expérimentation et de maturation, l’application des principes de durabilité aux projets de nouveaux quartiers est aujourd’hui entrée dans une phase de généralisation et de normalisation ... [more ▼]

Après une phase d’expérimentation et de maturation, l’application des principes de durabilité aux projets de nouveaux quartiers est aujourd’hui entrée dans une phase de généralisation et de normalisation. Le concept de « quartiers durables » s’est démocratisé et fait l’objet d’une popularité grandissante. On ne peut a priori que s’en réjouir, pour autant que cette diffusion réponde à une véritable affirmation des principes clés du développement durable à l’échelle des quartiers et qu’elle s’inscrive dans une logique territoriale à plus grande échelle. C’est dans cette optique qu’a été développé le référentiel quartiers durables, élaboré par le Centre de Recherches sur la Ville, le Territoire et le Milieu Rural (Lepur) de l’Université de Liège (Belgique), à la demande du Ministre wallon de l’Environnement, de l’Aménagement du Territoire et de la Mobilité. Ce référentiel constitue un cadre général visant à inciter et favoriser l’émergence d’opérations innovantes en matière de quartiers durables et s’inscrit dans le cadre de la Déclaration de Politique Régionale par laquelle le Gouvernement wallon s’est engagé à soutenir des opérations innovantes en la matière. Ce référentiel opérationnalise le concept de « quartier durable » en objectivant les critères minimum à respecter pour prétendre à cette appellation, considérant que, si tous les quartiers n’ont pas pour vocation d’entrer dans cette démarche, intégrer des critères transversaux de durabilité dans le plus grand nombre possible d’opérations d’urbanisme est un enjeu sociétal majeur. Concrètement, le référentiel quartiers durables s’articule autour de 5 thématiques (les potentialités du site et du projet, les ressources, les milieux naturels, les aménagements, la mixité et la participation) et de 25 critères qui couvrent les critères minimum à respecter pour inscrire un projet dans une vision transversale de développement durable. Une valeur-seuil est attribuée à chaque critère et modulée selon les potentialités du site. L’ensemble des critères sont expliqués dans un langage simple et complétés d’exemples de bonnes pratiques, de photos et de schémas explicatifs de façon à faciliter l’appropriation du référentiel par tous les acteurs de l’aménagement du territoire et à favoriser le développement des projets de quartiers réellement durables. Cet outil d’aide à l’élaboration et à l’évaluation des projets de quartiers durables est destiné aux administrations communales et régionales, aux promoteurs et aux auteurs de projet. Il peut s’appliquer à différents types de procédures urbanistiques (permis d’urbanisation, permis groupés, plans communaux d’aménagement, rapport urbanistiques et environnementaux) comme lors de concours ou d’appels à projets. Le référentiel quartiers durables a été appliqué, dans une première phase, à douze projets existants de quartiers durables (terminés ou en cours de production) afin de tester son applicabilité et d’ajuster les valeurs-seuils proposées. Le référentiel a ensuite été mobilisé dans le cadre d’une opération-pilote d’aménagement d’un quartier durable (dialogue compétitif pour la réalisation d’un nouveau quartier durable sur le site de la Sucrerie à Genappe, 291 logements, 8 hectares, 62 millions d’investissement). Validé politiquement et distribué largement (2.500 exemplaires) aux acteurs locaux de l’aménagement du territoire et de la production de quartiers durables, le référentiel quartier durable est actuellement utilisé par les acteurs locaux dans de nombreuses opérations en cours de développement. Notre contribution présentera d’abord le référentiel quartier durable et le contexte dans lequel il a été développé. Elle abordera ensuite l’application du référentiel à douze études de cas, puis un retour d’expérience sur l’opération-pilote en cours de développement à Genappe. Enfin, l’appropriation rapide du référentiel par les acteurs de l’aménagement du territoire, la reproductibilité du référentiel dans d’autres contextes et les perspectives ouvertes par ce nouvel outil d’aménagement durable concluront notre contribution. [less ▲]

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See detailCaractéristiques des pluies et ravinement dans la ville de Kinshasa de 1961 à 2010
Makanzu, Fils; Ozer, Pierre ULg; Moeyersons, Jan

in Ozer, André; Ozer, Pierre (Eds.) Colloque International "La Géographie Physique et les Risques Naturels" - Livre de résumés (2014)

Cette étude traite de l’évolution des caractéristiques pluviométriques dans la ville de Kinshasa de 1961 à 2010. Elle mène une analyse minutieuse des tendances qui se focalise sur les événements extrêmes ... [more ▼]

Cette étude traite de l’évolution des caractéristiques pluviométriques dans la ville de Kinshasa de 1961 à 2010. Elle mène une analyse minutieuse des tendances qui se focalise sur les événements extrêmes, les anomalies et le nombre de jours de pluies. Cette étude répond également au manque d’informations sur les tendances des variables pluviométriques et des extrêmes climatiques dans la sous-région de l’Afrique centrale. Elle recherche et évalue les preuves des changements dans l'intensité des événements pluvieux extrêmes quotidiens. Enfin, elle estime et caractérise les périodes de retour des événements pluvieux extrêmes dans la ville. [less ▲]

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See detailUse of high performance computing in animal breeding
Vandenplas, Jérémie ULg; Gengler, Nicolas ULg

in Book of Abstracts of the 65th Annual Meeting of the European Federation of Animal Science (2014)

High-perfomance computing facilities proposing shared-memory and distributed-memory multiprocessors are becoming available. With those clusters, parallel computing could lead to increased performances and ... [more ▼]

High-perfomance computing facilities proposing shared-memory and distributed-memory multiprocessors are becoming available. With those clusters, parallel computing could lead to increased performances and problem sizes. However, to our knowledge and especially for variance components estimations, most software available in animal breeding, based on sparse matrices computations, do not allow parallel computing and are limited by memory accessible by the central processing unit, or allow parallel computing only for options with dense matrices computations, which limits anyway problem sizes due to storage of dense matrices. The aim was to propose simple and effective modifications for the BLUPF90 family of programs to reduce computing time with consideration of required memory. Modifications were based on academic free packages proposing solver and sparse inversion for sparse symmetric indefinite linear systems. First, modifications concerned the sparse inversion subroutine implemented in the package FSPAK. Rearrangements of 'do' loops to allow optimizations of computer operations by some compilers and addition of OpenMP directives were performed. The ordering operation was modified to more easily compare a multiple minimum degree algorithm (MMD; implemented in FSPAK) and a multilevel nested dissection algorithm (implemented in METIS 4.0.3). Second, the package PARDISO Version 5.0.0 was used instead of FSPAK. This package proposes in particular a parallel solver and sparse inversion on shared-memory multiprocessors. Modified FSPAK and PARDISO were compared to original FSPAK using MMD through REMLF90. Different models, such as univariate or bivariate (random regressions) test-day animal and single-step genomic models, were tested. All jobs were run 5 times. With an appropriate ordering algorithm, speedup for each REMLF90 iteration were up to 7.5 for modified FSPAK and up to 22.8 for PARDISO with 2 threads. With 4 threads, speedup increased to 8.3 and 32.5, respectively. [less ▲]

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See detailMicromorph brachiopods from the Viséan (Carboniferous) of northwest Ireland
Mottequin, Bernard ULg; Sevastopulo, George; Simon, Eric

in Cerdeno, Esperanza (Ed.) 4th International Palaeontological Congress, Abstract Volume (2014)

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See detailVertical transient loading of a suction caisson in dense sand
Cerfontaine, Benjamin ULg; Collin, Frédéric ULg; Charlier, Robert ULg

in Cerfontaine, Benjamin; Collin, Frédéric; Charlier, Robert (Eds.) 14th International Conference of the International Association for Computer Methods and Avances in Geomechanics (2014)

Suction caissons are hollow cylinders open towards the bottom currently used as anchors for deep water offshore facilities. They recently turned out to be advantageously exploited as foundation for ... [more ▼]

Suction caissons are hollow cylinders open towards the bottom currently used as anchors for deep water offshore facilities. They recently turned out to be advantageously exploited as foundation for offshore wind turbines in shallow water (Senders 2009). The Prevost model for cohesionless soils (Prevost 1985) is adapted for the modelling of their cyclic behaviour. It is able to reproduce plastic deformation in both loading and unloading, contractancy of the soil and pore pressure build up as well. In this paper, a fully-coupled transient axisymmetric analysis of a suction caisson is carried out. The monotonic partially drained behaviour of the caisson is firstly highlighted. Afterwards, pseudo-random and sinusoidal-equivalent storm signals are compared. Permanent displacements accumulated at the end of the storm show a good agreement between them but are slightly divergent, which indicates that the position of the extreme event might be a relevant issue. [less ▲]

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See detailApprentissage par renforcement batch fondé sur la reconstruction de trajectoires artificielles
Fonteneau, Raphaël ULg; Murphy, Susan A.; Wehenkel, Louis ULg et al

in Proceedings of the 9èmes Journées Francophones de Planification, Décision et Apprentissage (JFPDA 2014) (2014)

Cet article se situe dans le cadre de l’apprentissage par renforcement en mode batch, dont le problème central est d’apprendre, à partir d’un ensemble de trajectoires, une politique de décision optimisant ... [more ▼]

Cet article se situe dans le cadre de l’apprentissage par renforcement en mode batch, dont le problème central est d’apprendre, à partir d’un ensemble de trajectoires, une politique de décision optimisant un critère donné. On considère plus spécifiquement les problèmes pour lesquels l’espace d’état est continu, problèmes pour lesquels les schémas de résolution classiques se fondent sur l’utilisation d’approxima- teurs de fonctions. Cet article propose une alternative fondée sur la reconstruction de “trajectoires arti- ficielles” permettant d’aborder sous un angle nouveau les problèmes classiques de l’apprentissage par renforcement batch. [less ▲]

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See detailUse of high performance computing in animal breeding
Vandenplas, Jérémie ULg; Gengler, Nicolas ULg

in Book of Abstracts of the 65th Annual Meeting of the European Federation of Animal Science (2014)

High-perfomance computing facilities proposing shared-memory and distributed-memory multiprocessors are becoming available. With those clusters, parallel computing could lead to increased performances and ... [more ▼]

High-perfomance computing facilities proposing shared-memory and distributed-memory multiprocessors are becoming available. With those clusters, parallel computing could lead to increased performances and problem sizes. However, to our knowledge and especially for variance components estimations, most software available in animal breeding, based on sparse matrices computations, do not allow parallel computing and are limited by memory accessible by the central processing unit, or allow parallel computing only for options with dense matrices computations, which limits anyway problem sizes due to storage of dense matrices. The aim was to propose simple and effective modifications for the BLUPF90 family of programs to reduce computing time with consideration of required memory. Modifications were based on academic free packages proposing solver and sparse inversion for sparse symmetric indefinite linear systems. First, modifications concerned the sparse inversion subroutine implemented in the package FSPAK. Rearrangements of 'do' loops to allow optimizations of computer operations by some compilers and addition of OpenMP directives were performed. The ordering operation was modified to more easily compare a multiple minimum degree algorithm (MMD; implemented in FSPAK) and a multilevel nested dissection algorithm (implemented in METIS 4.0.3). Second, the package PARDISO Version 5.0.0 was used instead of FSPAK. This package proposes in particular a parallel solver and sparse inversion on shared-memory multiprocessors. Modified FSPAK and PARDISO were compared to original FSPAK using MMD through REMLF90. Different models, such as univariate or bivariate (random regressions) test-day animal and single-step genomic models, were tested. All jobs were run 5 times. With an appropriate ordering algorithm, speedup for each REMLF90 iteration were up to 7.5 for modified FSPAK and up to 22.8 for PARDISO with 2 threads. With 4 threads, speedup increased to 8.3 and 32.5, respectively. [less ▲]

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See detailManagement of Environmental Security Through Organic Agriculture. Contribution of Consumer Behavior
Petrescu, Dacinia Crina; Petrescu-Mag, Ruxandra Malina; Burny, Philippe ULg

in Ozunu, Alexandru (Ed.) The 10th Elsedima International Conference : Book of abstracts “Environmental Legislation, Safety Engineering and Disaster Management”, September 18th-19th, 2014, Cluj-Napoca, Romania : 10th Anniversary (2014)

The paper examines and argues why environmental issues are matters of security, offering conceptual clarifications upon "environmental security". The range of issues considered as "environmental security ... [more ▼]

The paper examines and argues why environmental issues are matters of security, offering conceptual clarifications upon "environmental security". The range of issues considered as "environmental security" subjects are numerous and diverse and one of these is related to food. Food production, storage, distribution and quality have always been linked to environ mental conditions. Food security through organic agriculture contributes to environ mental security. Scientists often point to three factors as responsible for environ mental state - population, technology, and consumption, but consumption seems to get the least attention. We studiad consumer behaviour as source of positive and negative consequences with impact on environmental security. The study case presents the results of a survey targeted on organic food consumers from NW Romania. We found that 73% of subjects believe that organic food helps protecting the environ ment more than conventional food and 60% believe that animal organic food comes from animais that had better life (than conventional ones). We found a statistically significant difference between people who believe humanity faces natural environ ment problems which are very threatening and those who do not concerning the strength of beliefs that organic food helps protecting the environment more than conventional food (p<O.05). We observed a direct, strong relationship between the strength of beliefs that organic food has capacity to preserve existence of traditional products and strength of beliefs that organic food has the capacity to protect natural environ ment [r=.506, p=.OOO]. The paper defends the idea that consumers' beliefs such as those related to nature protection or animal welfare through organic food are valuable instruments that help to strengthen the environ mental security. [less ▲]

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See detailEosinophilic Bronchopneumopathy
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014)

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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 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 detailSaisir l’évaluation de l’université en actes : interprétations et appropriations des parties prenantes.
Charlier, Nathan ULg; Vangeebergen, Thomas ULg

in Fallon, Catherine; Leclercq, Bruno (Eds.) Leurres de la qualité dans l’enseignement supérieur. Variations internationales sur un thème ambigu (2014)

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See detailMarquage casuel des dépendants nominaux du verbe en ancien français: approche dépendancielle
Mazziotta, Nicolas ULg

in Neveu, Franck; Blumenthal, Peter; Gerstenberg, Annette (Eds.) et al 4e Congrès Mondial de Linguistique Française. Berlin, Allemagne, 19-23 Juillet 2014 (2014)

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See detailIntroduction. Guerre et jeu : vers les cultures d'un paradoxe à l'ère moderne
Küpper, Achim ULg

in Küpper, Achim; Vanden Berghe, Kristine (Eds.) Guerre et jeu. Cultures d'un paradoxe à l'ère moderne (2014)

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See detailOpérationnel et politique foncière : esquisse de commentaire
Donnay, Luc ULg

in Delnoy, Michel (Ed.) Le Code wallon de développement territorial (2014)

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See detailDetection of near-field, low permittivity layers with Ground Penetrating Radar: analytical estimation of the reflection coefficient
Van der Wielen, Audrey; Courard, Luc ULg; Nguyen, Frédéric ULg

in LAMBOT, Sébastien (Ed.) Proceedings of 15th International Conference on ground Penetrating Radar (2014)

The reflection coefficient of GPR waves encountering embedded thin layers is commonly estimated using a plane wave, far field approximation. But when the thin layer is situated in the near field of the ... [more ▼]

The reflection coefficient of GPR waves encountering embedded thin layers is commonly estimated using a plane wave, far field approximation. But when the thin layer is situated in the near field of the antenna, the spherical nature of the waves and the possible propagation of a lateral wave into the layer may have a strong influence on the measured reflected amplitude. In this work, we studied through 2D FDTD simulations the behavior of a radar wave interacting with thin layers of different thicknesses. The snapshots and radargrams showed a large influence of the layer thickness on the wave propagation. For the very thin layers, the evanescent wave plays a major role and the plane wave approximation gives a good estimation of the reflection coefficient. For thicker layers, the specific inclination of each multiple reflection has to be taken into account, as well as the lateral wave propagation. On the basis of these observations, we determined which analytical method should be used for the analytical prediction of the reflection coefficient, as a function of the layer thickness. [less ▲]

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See detailImpacts des récentes variations pluviométriques sur le droit du sol, l’accès a l’eau et l’agriculture en Mauritanie : l’exemple du lac de Mâle
Gassani, Jean; De Longueville, Florence ULg; Gemenne, François ULg et al

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

The Islamic Republic of Mauritania is at a socio-political crossroads in its history. Environmental crises coupled with the transformation of economic activities and population pressures disrupt social ... [more ▼]

The Islamic Republic of Mauritania is at a socio-political crossroads in its history. Environmental crises coupled with the transformation of economic activities and population pressures disrupt social structures of the country. The drought that began in 1970 has transformed the nomadic lifestyle, forcing them to settle. This deeply changed tribes’ perception access to land and water resources, and has led to increased pressure on the Haratines (former black slaves) in agricultural production. With the release of human rights, the enactment of a land law, and taking into account the Sharia, former slaves claimed their ownership of the land they cultivated. The refusal of the latter to access their application, the Haratines headed for land undeveloped and interfered in the customary practice of the management of water catchments. The latent conflict escalated into open in the watershed of Lake Mâle. Today, the situation does not improve since the political will collides with local tribal authorities. [less ▲]

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See detailSaharan dust: An under-studied but significant source of air pollution in West Africa
Ozer, Pierre ULg; De Longueville, Florence ULg

in Belviso, Claudia; Fiore, Saverio; Giannossi, Maria Luigia (Eds.) DUST2014 - International Conference on Atmospheric Dust _ Book of Abstracts (2014)

Recently, the World Health Organization’s International Association for Research on Cancer (IARC) classified outdoor air pollution as carcinogenic to humans and now puts air pollution in the same category ... [more ▼]

Recently, the World Health Organization’s International Association for Research on Cancer (IARC) classified outdoor air pollution as carcinogenic to humans and now puts air pollution in the same category as tobacco smoke, UV radiation and plutonium. Exposure to ambient fine particles was recently estimated to have contributed 3.2 million premature deaths worldwide in 2010. The ambient air across the globe is polluted by emissions from motor vehicles, industrial processes, power generation, household combustion of solid fuel, and other sources. Dust storms lead to particulate levels that exceed internationally recommended levels especially in West Africa but this source of air pollution is under-studied, particularly in the literature devoted to human health impacts. [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 detailLe corps du Prince. La perception de l'Egypte ancienne
Winand, Jean ULg

in Marchandisse, Alain (Ed.) Le corps du Prince (2014)

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See detailQuantifier la charge de travail chez le jeune rugbyman? Pourquoi? Comment?
Paulus, Julien ULg; Laly, Arnaud

in Rassemblement National des Préparateurs Physiques (2014)

La prévention du dépassement (over-reaching) ou tout du moins sa détection précoce est capitale dans le processus d'entrainement compte-tenu de ses effets négatifs sur la performance. L'individualisation ... [more ▼]

La prévention du dépassement (over-reaching) ou tout du moins sa détection précoce est capitale dans le processus d'entrainement compte-tenu de ses effets négatifs sur la performance. L'individualisation de la planification des entrainements rugbystiques et physiques est nécessaire pour ne pas dépasser la charge de travail préalablement identifiée comme optimale pour chaque joueur. En effet, en institutionnalisant les cycles de récupération et de repos relatif, comme nous le réalisions auparavant, la charge réelle n'était pas prise en compte mais bien la charge théorique prévue par la planification. A cette charge de travail du centre de formation, viennent s'ajouter celle du club d'appartenance de chaque joueur mais aussi celle des différentes équipes nationales… Les disparités entre les joueurs en terme de charge de travail et donc de fatigue apparaissent rapidement sans compter les joueurs qui sont blessés et/ou en période de réathlétisation! La difficulté pour nous était d'identifier le moment opportun pour proposer des phases de récupération dans le respect du joueur, de son développement à long terme mais aussi dans notre tâche d'améliorer sa performance. [less ▲]

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See detailLes dieux et la cité. Représentations des divinités tutélaires entre Grèce et Phénicie
Bonnet, Corinne; Pirenne-Delforge, Vinciane ULg

in Zenzen, Nicolas; Hölscher, Tonio; Trampedach, Kai (Eds.) Aneignung und Abgrenzung. Wechselnde Perspektiven auf die Antithese von ‘Ost’ und ‘West’ in der griechischen Antike (2014)

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See detailA Fast Newton-Raphson Method in Stochastic Linearization
Canor, Thomas ULg; Blaise, Nicolas ULg; Denoël, Vincent ULg

in Proceedings of the Ninth International Conference on Structural Dynamics (2014)

Owing to its accessible implementation and rapidity, the equivalent linearization has become a common probabilistic approach for the analysis of large-dimension nonlinear structures, as encountered in ... [more ▼]

Owing to its accessible implementation and rapidity, the equivalent linearization has become a common probabilistic approach for the analysis of large-dimension nonlinear structures, as encountered in earthquake and wind engineering. It consists in replacing the nonlinear system by an equivalent linear one, by tuning the parameters of the equivalent system, in order to minimize some discrepancy error. Consequently classical analysis tools such as the spectral analysis may be reconditioned to approximate the solution of structures with slight to moderate nonlinearities. The tuning of the equivalent parameters requires the solution of a set of nonlinear algebraic equations involving integrals. It is typically performed with the fixed-point algorithm, which is known to behave poorly in terms of convergence. We therefore advocate for the use and implementation of a Newton-Raphson approach, which behaves much better, even in its dishonest formulation. Unfortunately, this latter option requires the costly construction of a Jacobian matrix. In the approach described in this paper, this issue is answered by introducing a series expansion method that provides a fast and accurate estimation of the residual function (whose solution provides the equivalent parameters) and a fast and approximate estimation of the Jacobian matrix. An illustration demonstrate the good accuracy obtained with the proposed method. [less ▲]

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See detailFirst assessment of the impacts of Saharan dust events on the respiratory health in West Africa: A case study in the Northern Benin
De Longueville, Florence ULg; Henry, Sabine; Ozer, Pierre ULg

in Belviso, Claudia; Fiore, Saverio; Giannossi, Maria Luigia (Eds.) DUST2014 - International Conference on Atmospheric Dust _ Book of Abstracts (2014)

More than 50% of the global dust emitted into the atmosphere comes from the Sahara. About 60% of the Saharan dust move southwards to the Gulf of Guinea (Engelstaedter et al., 2006). Once in the air, these ... [more ▼]

More than 50% of the global dust emitted into the atmosphere comes from the Sahara. About 60% of the Saharan dust move southwards to the Gulf of Guinea (Engelstaedter et al., 2006). Once in the air, these dust contribute to increase the concentrations of particles smaller than 10 microns (PM10), which are respirable particles (Ozer et al. 2005). A number of adverse health effects have been associated with desert dust, including respiratory diseases (Goudie, 2014). [...] [less ▲]

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See detailInteger Programs with Prescribed Number of Solutions and a Weighted Version of Doignon-Bell-Scarf’s Theorem
Aliev, Iskander; De Loera, Jesus; Louveaux, Quentin ULg

in Lee, Jon; Vygen, Jens (Eds.) Proceedings of the 17th IPCO (2014)

In this paper we study a generalization of the classical fesibility problem in integer linear programming, where an ILP needs to have a prescribed number of solutions to be considered solved. We first ... [more ▼]

In this paper we study a generalization of the classical fesibility problem in integer linear programming, where an ILP needs to have a prescribed number of solutions to be considered solved. We first provide a generalization of the famous Doignon-Bell-Scarf theorem: Given an integer k, we prove that there exists a constant c(k, n), depending only on the dimension n and k, such that if a polyhedron {x : Ax ≤ b} contains exactly k integer solutions, then there exists a subset of the rows of cardinality no more than c(k,n), defining a polyhedron that contains exactly the same k integer solutions. The second contribution of the article presents a structure theory that characterizes precisely the set Sg≥k (A) of all vectors b such that the problem Ax = b, x ≥ 0, x ∈ Zn , has at least k-solutions. We demonstrate that this set is finitely generated, a union of translated copies of a semigroup which can be computed explicitly via Hilbert bases computation. Similar results can be derived for those right-hand-side vectors that have exactly k solutions or fewer than k solutions. Finally we show that, when n, k are fixed natural numbers, one can compute in polynomial time an encoding of Sg≥k(A) as a generating function, using a short sum of rational functions. As a consequence, one can identify all right-hand-side vectors that have exactly k solutions (similarly for at least k or less than k solutions). Under the same assumptions we prove that the k-Frobenius number can be computed in polynomial time. [less ▲]

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See detailMultiscale aspects in modeling percussive drilling: from wave propagation to rigid body dynamics
Depouhon, Alexandre ULg; Denoël, Vincent ULg; Detournay, Emmanuel

in Proceedings of the 3rd International Colloquium on Nonlinear Dynamics and Control of Deep Drilling Systems (2014)

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See detailInfluence of microfabric evolution on the retention behaviour of compacted clayey soils
Dieudonné, Anne-Catherine ULg; Della Vecchia, Gabriele; Charlier, Robert ULg et al

in Khalili, Nasser; Russel, Adrian; Khoshghalb, Arman (Eds.) Unsaturated Soils: Research and Applications (2014)

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See detailDesigning and testing an air-PCM heat exchanger for building ventilation application coupled to energy storage
Dechesne, Bertrand ULg; Gendebien, Samuel ULg; Martens, Jonathan et al

in 2014 Purdue Conferences Proceedings (2014)

This paper studies a PCM heat exchanger coupled to a building ventilation system. This PCM module can either store heat during the day (e.g. by cooling solar PV panels) and restore it to the building ... [more ▼]

This paper studies a PCM heat exchanger coupled to a building ventilation system. This PCM module can either store heat during the day (e.g. by cooling solar PV panels) and restore it to the building during the night for space heating purposes or store coolness during the night and give it back during the day and thus act as a free cooling system. This project aims to develop a performing air-PCM heat exchanger providing latent energy storage of 0.5 kWh, this energy is delivered between 15 and 30°C. This heat exchanger is based on corrugated cells that can be easily filled, lined up and then locked in a box, letting the air pass between the cells. The PCM used for the prototype is c omposed of fatty acids. In order to develop an efficient PCM ventilation module, two different ways of investigation were followed and used in parallel. The first one used CFD simulations and the second one, a semi-empirical model based on correlations. The CFD simulations were able to predict the convection coefficient on the air side and also show the flow repartition between the different channels whereas the semi-empirical model allowed a parametrical study in order to identify the best geometry possible. Once the heat exchanger geometry was optimized, a test bench was built and a prototype of air-PCM heat exchanger was manufactured in order to measure its thermal and hydraulic performances. The tests consist in either a complete solidification or liquefaction of the PCM starting from respectively liquid PCM at 30°C or solid PCM at 15°C. The airflow rate was set to 45m³/h, which corresponds barely to the ventilation rate of a traditional room in a residential building. A comparison between the models and the measurements was carried out in order to calibrate the semi-empirical model. It will be shown that a simple semi-empirical model satisfactorily predicts the evolution of heat transfer rate for different operating conditions. [less ▲]

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See detailBi-stable flow fields and two-way couplings between flow and sedimentation in shallow reservoirs
Dewals, Benjamin ULg; Peltier, Yann ULg; Pirotton, Michel ULg et al

in 3rd IAHR Europe Congress, Book of Proceedings, Porto, Portugal, 14-16 April 2014 (2014)

Shallow reservoirs are structures commonly used in civil and environmental engineering. Recent experimental and numerical research has focused on the velocity fields and sediment deposits in rectangular ... [more ▼]

Shallow reservoirs are structures commonly used in civil and environmental engineering. Recent experimental and numerical research has focused on the velocity fields and sediment deposits in rectangular shallow reservoirs. These analyses highlighted the existence of fascinating complex flow fields and sedimentation patterns, involving bi-stable flow fields and significant two-way couplings between flow and sedimentation in such reservoirs. We review here the findings of the latest research and present on-going developments. [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 detailNonlinear generalization of Den Hartog's equal peak method for nonlinear primary systems
Habib, Giuseppe ULg; Detroux, Thibaut ULg; Kerschen, Gaëtan ULg

in Proceedings of the International Conference on Structural Nonlinear Dynamics and Diagnosis (2014)

This study addresses the mitigation of one problem nonlinear resonance of a mechanical system. In view of the narrow bandwidth of the classical linear tuned vibration absorber, a new nonlinear absorber ... [more ▼]

This study addresses the mitigation of one problem nonlinear resonance of a mechanical system. In view of the narrow bandwidth of the classical linear tuned vibration absorber, a new nonlinear absorber, termed the nonlinear tuned vibration absorber (NLTVA), is introduced in this paper. One unconventional aspect of the NLTVA is that the mathematical form of its restoring force is tailored according to the nonlinear restoring force of the primary system. The NLTVA parameters are then determined using a nonlinear generalization of Den Hartog's equal-peak method. The mitigation of the resonant vibrations of a Duffing oscillator is considered to illustrate the proposed developments. [less ▲]

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See detailLe financement rural du Niger : élément clé du développement
Andres, Ludovic ULg; Lebailly, Philippe ULg

in Brot, Jean (Ed.) Les Cahiers de l'Association Tiers-Monde n° 29-2014 : XXIXes Journées sur le Développement "Economie informelle et développement : emploi, financement et régulations dans un contexte de crise" (2014)

Ce document décrit les possibilités de financement du milieu rural (collectivités et ménages). L'analyse de l'offre a établi une typologie des financements en fonction des acteurs (public, privé formel et ... [more ▼]

Ce document décrit les possibilités de financement du milieu rural (collectivités et ménages). L'analyse de l'offre a établi une typologie des financements en fonction des acteurs (public, privé formel et informel). Elle discerne l'ensemble des possibilités de financement des ménages ruraux. La présente étude a été établie à partir d'interviews avec les acteurs clés du secteur, d'observations lors de mission sur le terrain et de données secondaires provenant de la BCEAO, des acteurs publics en matière de développement rural ainsi que d'une revue de littérature sur le financement rural, les Systèmes Financiers Décentralisés et la microfinance en Afrique de l'Ouest. [less ▲]

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See detailHydration kinetics of compacted low-density bentonite
Dieudonné, Anne-Catherine ULg; Romero, Enrique; Charlier, Robert ULg

in Khalili, Nasser; Russel, Adrian; Khoshghalb (Eds.) Unsaturated Soils: Research and Applications (2014)

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See detailImportance of structural damping in the dynamic analysis of compliant deployable structures
Dewalque, Florence ULg; Rochus, Pierre ULg; Bruls, Olivier ULg

in Proceedings of the 65th International Astronautical Congress (IAC) (2014)

Compliant mechanisms such as tape springs are often used on satellites to deploy appendices, e.g. solar panels, antennas, telescopes and solar sails. Their main advantage comes from the fact that their ... [more ▼]

Compliant mechanisms such as tape springs are often used on satellites to deploy appendices, e.g. solar panels, antennas, telescopes and solar sails. Their main advantage comes from the fact that their motion results from the elastic deformation of structural components, unlike usual hinges or prismatic joints, the motion of which is dictated by contact surfaces. No actuators or external energy sources are required and the deployment is purely passive, which appears as a decisive feature for the design of low-cost missions with small satellites or cubesats. The mechanical behaviour of a tape spring is intrinsically complex and nonlinear involving buckling, hysteresis and self-locking phenomena. High-fidelity mechanical models are then needed to get a detailed understanding of the deployment process, improve the design and predict the actual behaviour in the space 0-g environment. In the majority of the previous works, dynamic simulations were performed without any physical representation of the structural damping. These simulations could be successfully achieved because of the presence of numerical damping in the transient solver. However, in this case, the dynamic response turns out to be quite sensitive to the amount of numerical dissipation, so that the predictive capabilities of the model are questionable. In this work based on numerical case studies, we show that the dynamic simulation of a tape spring can be made less sensitive to numerical parameters when the structural dissipation is taken into account. [less ▲]

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See detailÜber Möglichkeiten und Grenzen des Kulturtransfers. Günter Grass im Gespräch mit seinen Übersetzern
Letawe, Céline ULg

in Pasewalck, Silke (Ed.) "Interkulturalität und (literarisches) Übersetzen". Wechselwirkungen zwischen Literaturwissenschaft und Translatologie. (2014)

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See detailInvestigation of pregnancy-associated glycoproteins (PAGs) by means of an enzymoimunoassay (ELISA) sandwich kit for pregnancy monitoring in sheep
El Amiri, Bouchra; Delahaut, Philippe; Colemans, Yves et al

in Chentouf, M; López-Francos, A; Bengoumi, M (Eds.) et al Options méditerranéennes : Series A (2014)

The aim of the present study was to investigate the use of a PAGs ELISA-Sandwich kit (Ret. code E.G.7. CER. Marloie, Belgium) for both early pregnancy diagnosis (in Sardi sheep) and the pregnancy follow ... [more ▼]

The aim of the present study was to investigate the use of a PAGs ELISA-Sandwich kit (Ret. code E.G.7. CER. Marloie, Belgium) for both early pregnancy diagnosis (in Sardi sheep) and the pregnancy follow up (in Boujaâd and Boujaâd x D'man sheep). ln Sardi breed, plasma samples were obtained from pregnant ewes (n = 17) from day 18 to 30 of gestation at 2 days interval. ln Boujaâd (n = 8) and Boujaâd x D'man (n = 20) the blood samples were weekly collected from the first week of gestation till the 4th week after lambing. The PAG concentrations were determined by a sandwich-ELISA based on purified bovine PAG (boPAG-67 kDa) as a standard, the antiserum raised against caprine PAG (caPAG-55+62 kDa) as a capture antibody (1/40000) and antiserum raised against purified PAG from buffalo (AS 859) as detection antibody (1/32 000). The Avidin-HRP and TMB were used to reveal reactions. Ewes were assumed to be pregnant when PAG concentrations were higher than 0.8 ng/ml. Results showed that in Sardi sheep it is possible to detect ail ewes as pregnant as early as on 24 days of gestation. ln Boujaâd and Boujaâd x D'man the PAG concentrations reached the higher values just before lambing. This value is higher in ewes carrying more than one lamb than in those carrying a single lamb. To conclude, the present study shows that the ELISA kit used for early pregnancy diagnosis in sheep as weil as for pregnancy fellow up could be a good alternative to the radioimmunoassay RIA in countries where this last technique is hard to set up. [less ▲]

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See detailShape Optimization of Interior Permanent Magnet Motor for Torque Ripple Reduction
Kuci, Erin ULg; Geuzaine, Christophe ULg; Dular, Patrick ULg et al

in Proceedings of The 4th International Conference on Engineering Optimization: Lisbon (Portugal), 8-11 September 2014 (2014)

The objective of the paper is to present an open source environment to perform the design, simulation (Gmsh, GetDP) and optimization (OpenOpt) of electrical machines. The design of the permanent magnets ... [more ▼]

The objective of the paper is to present an open source environment to perform the design, simulation (Gmsh, GetDP) and optimization (OpenOpt) of electrical machines. The design of the permanent magnets of a v-shaped interior permanent magnet machine is then considered. The later is modeled using the finite element method with a formulation based on the magnetic vector potential. Optimization is based on mathematical programming approach. A semi-analytical sensitivity analysis is compared with the finite difference. Thanks to this approach, the design time is much shorter than that required by an approach of trial and error used by industry. The reduction of the torque ripple is about 70 \% with respect to the original design. [less ▲]

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See detailDemisso capite : Ablatif absolu ou épithète détachée ?
Longrée, Dominique ULg

in Lehmann, Christian; Concepcion, Cabrillana L. (Eds.) Acta XIV Colloquii Internationalis Linguisticae Latinae (2014)

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