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

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

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

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

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

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

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

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

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See detailBacterial and viral pneumonia
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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See detailChronische Bronchitis Hund
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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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, February)

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

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

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

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

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

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

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

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

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

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

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

in Incremental sheet forming (2014, January 06)

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

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

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

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

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

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

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

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

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

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

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

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

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See 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 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 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 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 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 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 detailRelationship between vasodilation capacity, antioxidant activity and phenolic content of different types of wine aging in oak barrels
Degives, Julien; Kevers, Claire ULg; PINCEMAIL, Joël ULg et al

in International Conference Wine Active Compounds 2014 (2014)

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

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

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

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

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See detailImpact de l’érosion littorale sur les migrations forcées. Cas de Cotonou, Bénin.
Ozer, Pierre ULg; Hountondji, Yvon-Carmen; Bessan, Modestine Victoire et al

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

En utilisant la fonction multi dates disponible dans Google Earth, cet article estime la superficie érodée à Cotonou entre 2002 et 2011 à l’est de l’exutoire du Lac Nokoué. En outre, il évalue le nombre ... [more ▼]

En utilisant la fonction multi dates disponible dans Google Earth, cet article estime la superficie érodée à Cotonou entre 2002 et 2011 à l’est de l’exutoire du Lac Nokoué. En outre, il évalue le nombre de maisons détruites ainsi que le nombre de personnes contraintes à une migration forcée. Les figures sont importantes puisque de l’ordre de cent mètres de zone côtière ont totalement disparu en une décennie sur un tronçon de près de six kilomètres de long en pleine ville ou en proche périphérie. [less ▲]

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See detailLes pseudo-déonomastiques arabes en français : Étude de cas et tentative de typologie
Baiwir, Esther ULg; Steffens, Marie ULg

in Dworkin, Steven; García arias, Xosé Lluis; Kramer, Johannes (Eds.) Actes du XXVIIe Congrès international de linguistique et de philologie romanes (Nancy, 15-20 juillet 2013). Section 6 : Étymologie (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 detailLes TICE dans les approches interculturelles en classe de FLE/S : Leviers ou obstacles dans l’apprentissage de l’écrit ? Pratiques déclarées et représentations d’enseignants de FLE/S en contexte universitaire
Dezutter, Olivier; Bleys, Françoise; Eid, Rodine et al

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

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See 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 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 detailPerturbation methods for the determination of the statistical response of nonlinear Volterra systems
Denoël, Vincent ULg; Carassale, Luigi

in Proceedings of the Eurodyn 2014 Conference (2014)

The point-like quasi-steady aerodynamic loading in a turbulent flow is formally expressed as a function of the squared relative velocity between the fluid and the investigated structure. The three major ... [more ▼]

The point-like quasi-steady aerodynamic loading in a turbulent flow is formally expressed as a function of the squared relative velocity between the fluid and the investigated structure. The three major terms governing the low-order statistics of the response are known to be related to the average loading, the linear turbulent loading and the aerodynamic damping. The three other terms in the loading, namely the quadratic turbulence term, the parametric velocity feedback term and the squared velocity term, may significantly affect the higher order statistical cumulants of the response. These latter two sources of fluid-structure interaction are usually disregarded, by lack of efficient simulation tools, except a Monte Carlo simulation of the nonlinear equation. In this paper, we provide a formal analysis of the complete nonlinear model, including thus all six terms, but mainly focusing on the importance of the two nonlinear coupling terms of the loading. Closed form solutions of the response are derived for a second-order Volterra model of this problem, under the assumption of different timescales in the loading and in the structural behavior. Two major outcomes of the analysis are, on the one hand, that the squared structural velocity term has no influence on the cumulants of the response up to order 4 and, on the other hand, that the parametric velocity feedback acts as a reduction of the non Gaussianity of the response. [less ▲]

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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 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 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 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 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 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 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 detailExperimental campaign and modeling of a low capacity waste heat recovery system based on a single screw expander
Desideri, Adriano ULg; Van Den Broek, Martijn; Gusev, Sergei et al

in 22nd International Compressor Engineering Conference at Purdue, July 14-17, 2014 (2014)

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

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

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

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

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

in Grantham, Michael (Ed.) 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 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 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 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 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 detailLe double jeu libertin : du jeu de Blaise Pascal aux Considérations politiques sur les coups d’État de Gabriel Naudé
Decoster, Sara ULg

in Küpper, Achim; Vanden Berghe, Kristine (Eds.) Guerre et jeu : perspectives transversales sur un sujet historique, artistique et culturel à l'époque moderne (2014)

Dans cette conférence, nous nous proposons de déceler les éléments ludiques dans les Considérations politiques sur les coups d’estat (1639) de Gabriel Naudé. Pour ce faire, nous essaierons d’abord de ... [more ▼]

Dans cette conférence, nous nous proposons de déceler les éléments ludiques dans les Considérations politiques sur les coups d’estat (1639) de Gabriel Naudé. Pour ce faire, nous essaierons d’abord de dresser une anthropologie du jeu, sur base des travaux de J. Huizinga et R. Caillois, avant de rejoindre la philosophie wittgensteinienne sur le sujet. Le travail de Naudé étant fortement marqué par son contexte historique, nous avons effectué un rapprochement avec la théorie du divertissement de Pascal, telle que celle-ci apparaît dans les Pensées. Cet examen s’appuie notamment sur les Commentaires d'Henri Gouhier et sur les analyses de Colas Duflo (Le jeu : de Pascal à Schiller). De cette théorie du jeu découle une vision politique très particulière, théorisée par Christian Lazzeri et Gérard Ferreyrolles. La politique est le jeu destiné à organiser la société terrestre, où la loi s’appuie sur la force. Ces idées sont poussées à leur paroxysme dans les Considérations politiques sur les coups d’estat naudéennes. A travers l’exemple du massacre de la Saint-Barthélemy, que Naudé décrit, nous pouvons dégager en quoi consiste le jeu de Naudé : il s’agit d’un espace réglé, qui ne se définit toutefois qu’à posteriori. Le hasard et l’aspect jouissif du secret jouent un rôle important dans la pensée de Naudé. Ainsi se développe un jeu de rôles étrange entre les différents acteurs : le souverain, le peuple, et le philosophe. Les règles du jeu se complexifient, et, finalement, la position des différents pions sur l’échiquier ne sera plus très claire. Cette duplicité est caractéristique du libertinage, dont Naudé est un représentant important. [less ▲]

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See detailNanocomposite fiber reinforced mortars
Coppola, Bartolomeo; Di Maio, Luciano; Courard, Luc ULg et al

in Proceedings of the International Conference on Composites/Nano Engineering (2014)

The use of fibers to reinforce a brittle material is an extensively studied application. In the field of cementitious materials a wide range of fibers have been investigated, from natural to synthetic ... [more ▼]

The use of fibers to reinforce a brittle material is an extensively studied application. In the field of cementitious materials a wide range of fibers have been investigated, from natural to synthetic fiber (wood, cellulose, carbon, glass, polypropylene) in order to achieve several purposes. Nowadays there is a continuing effort to take advantage of recent advances in nanotechnology, in the polymer and fiber industry. Nanoclays are some of the most affordable materials that have shown promising results in nanocomposite polymers. They are characterized by a “platelet” structure with average dimension of 1 nm thick and 70 to 150 nm wide. This work is aimed at studying the different behavior of fiber reinforced mortars, containing nanocomposite polymeric fibers. [less ▲]

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See detailEosinophilic Bronchopneumopathy
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014)

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See detailClimate-proofing of large reservoirs in Belgium by the development of enhanced operation rules
Bruwier, Martin ULg; Dewals, Benjamin ULg; Erpicum, Sébastien ULg et al

in 3rd IAHR Europe Congress (2014)

Available climate change scenarios project drier summers and more humid winters for Belgium. This study addresses the impacts of those changes on the management of two multi-purpose reservoirs located in ... [more ▼]

Available climate change scenarios project drier summers and more humid winters for Belgium. This study addresses the impacts of those changes on the management of two multi-purpose reservoirs located in the Vesdre basin, and the search of enhanced operation rules to mitigate those changes. For this purpose, an integrated model is used, including a hydrological model of the Vesdre watershed, a hydraulic model of this river, a model of the dam complex operation rules and a flood risk model. Performance indicators of the dams are defined, representing drinking water production, damages due to floods, hydropower production and low-flow enrichment. First, a sensitivity analysis of the main parameters of the dam operation rules on the performance indicators is achieved. Afterwards, for two extreme climate scenarios at the time horizons 2021-2050 and 2071-2100, impacts of climate change on the reservoir performances are determined. Then, the results of the sensitivity analysis are used to indicate if climate change impacts may be mitigated by means of enhanced operation rules. [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 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 detailThermoCycle: A Modelica library for the simulation of thermodynamic systems
Quoilin, Sylvain ULg; Desideri, Adriano ULg; Wronski, Jorrit et al

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

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

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

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

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

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See detailGénitif -aes/-es pour -ae : vulgarisme ou hellénisme ?
Rochette, Bruno ULg

in Molinelli, Piera; Cuzzolin, Pierluigi; Fedriani, Chiara (Eds.) Latin vulgaire latin tardif X. Actes du Xe colloque international sur le latin vulgaire et tardif (Bergamo, 4-9 settembre 2012) (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 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 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 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 detailMise en ligne, mise à jour et mise en réseau du Französisches Etymologisches Wörterbuch
Renders, Pascale ULg

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

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See detailÉtalement urbain et vulnérabilité croissante face au risque d’inondation : l’exemple de Nouakchott (Mauritanie)
Ozer, Pierre ULg; Ould Sidi Cheikh, Mohamed Ahmed; Ozer, André ULg

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

Après la sécheresse et la désertification qui ont fortement frappé la Mauritanie dans les années 1970 et 1980, la ville de Nouakchott a connu un développement démographique spectaculaire. En effet, la ... [more ▼]

Après la sécheresse et la désertification qui ont fortement frappé la Mauritanie dans les années 1970 et 1980, la ville de Nouakchott a connu un développement démographique spectaculaire. En effet, la population de la capitale mauritanienne est passée de 134 704 habitants en 1977 à 899 887 habitants recensés en mars 2013. Depuis 2000, Nouakchott voit sa population augmenter de 125 personnes par semaine ; une croissance absolue jamais atteinte par le passé. La ville s'est donc agrandie considérablement et les nouveaux arrivants ont construit leurs maisons dans des zones marginales sans aménagement préalable. Plusieurs quartiers se sont installés soit dans des zones dépressionnaires à sols salés sous forme de sebkha, soit dans des zones dunaires fortement ensablées. [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 detailDynamic Modeling andControl System Definition for a Micro-CSP Plant Coupled with Thermal Storage Unit
Ireland, Melissa; Orosz, Matthew; Brisson, John et al

in Proceedings of TurboExpo 2014 (2014)

Organic Rankine cycle (ORC) systems are gaining ground as a means of effectively providing sustainable energy. Coupling small-scale ORCs powered by scroll expander-generators with solar thermal collectors ... [more ▼]

Organic Rankine cycle (ORC) systems are gaining ground as a means of effectively providing sustainable energy. Coupling small-scale ORCs powered by scroll expander-generators with solar thermal collectors and storage can provide combined heat and power to underserved rural communities. Simulation of such systems is instrumental in optimizing their control strategy. However, most models developed so far operate at steady-state or focus either on ORC or on storage dynamics. In this work, a model for the dynamics of the solar ORC system is developed to evaluate the impact of variable heat sources and sinks, thermal storage, and the variable loads associated with distributed generation. This model is then used to assess control schemes that adjust operating conditions for daily environmental variation. [less ▲]

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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 detailRepresentations for Cross-task, Cross-object Grasp Transfer
Hjelm, Martin; Detry, Renaud ULg; Ek, Carl Henrik et al

in IEEE International Conference on Robotics and Automation (2014)

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

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

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See 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 detailEtat du droit belge avant la tempête Salduz
Jacobs, Ann ULg

in Jacobs, Ann; Fourment, Françoios (Eds.) La garde à vue. Regards croisés belges, français et européens (2014)

Etat de la législation belge en ce qui concerne l'assistance de l'avocat lors des premiers interrogatoires avant la jurisprudence et la la loi Salduz.

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

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

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

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

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See detailLearning dextrous grasps that generalise to novel objects by combining hand and contact models
Kopicki, Marek; Detry, Renaud ULg; Schmidt, Florian et al

in IEEE International Conference on Robotics and Automation (2014)

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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 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 detailA LARGE STRAIN ELASTO-VISCOPLASTIC NUMERICAL MODEL
Careglio, Claudio; Canales Cardenas, Cristian ULg; Ribero, Melisa et al

in Bustamante, Roger (Ed.) Proceedings of PACAM XIV (2014)

A large strain elasto-viscoplastic Perzyna model was proposed by Ponthot. The resultant numerical model computes the elastic response using an hypoelastic model. A viscoplastic multiplier was proposed ... [more ▼]

A large strain elasto-viscoplastic Perzyna model was proposed by Ponthot. The resultant numerical model computes the elastic response using an hypoelastic model. A viscoplastic multiplier was proposed, then both inviscid (elastoplastic) and elastic limiting cases can be easily recovered. More recently the authors have included this viscoplastic model in a large strain constitutive model based on hyperelasticity and multiplicative decomposition of deformation gradient tensor. In this work a brief summary of both, hypoelastic and hyperelastic based large strain models of viscoplasticity is provided. Large strain examples are simulated in order to test the discussed models. Different parameters of the constitutive model are tested in order to study the sensitivity of the resultant algorithm. From the obtained results can be said that both models show a very good agree and represent very well the characteristic of the viscoplastic constitutive model. [less ▲]

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See detailPourquoi la théorie de la connaissance a besoin de la psychologie: les arguments de Stumpf
Dewalque, Arnaud ULg

in Gyemant, Maria (Ed.) Psychologie et psychologisme (2014)

Mon objectif est double. Il s’agira, d’une part, de retracer la position de Carl Stumpf face à la querelle du psychologisme (lectures psychologistes de Kant vs lectures antipsychologistes néokantiennes ... [more ▼]

Mon objectif est double. Il s’agira, d’une part, de retracer la position de Carl Stumpf face à la querelle du psychologisme (lectures psychologistes de Kant vs lectures antipsychologistes néokantiennes) et, d’autre part, d’en tirer quelques implications d’allure très générale concernant la place qu’il convient de réserver aux considérations psychologiques en philosophie. Je suggérerai: (1) que Stumpf adopte une voie médiane entre psychologisme et antipsychologisme, (2) que cette voie médiane est représentative de l'orientation philosophique de Brentano et de son école, (3) qu'elle débouche sur une conception fine des rapports entre philosophie (en particulier théorie de la connaissance) et psychologie: la théorie de la connaissance a besoin de la psychologie, sans être à proprement parler "fondée" sur elle. [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 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 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 detailExperimental arguments concerning a hydraulic connection layer during limestone convective drying
Prime, Noémie ULg; Housni, Z.; Fraikin, Laurent ULg et al

in Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014 (2014)

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See detailRégner en mode épistolaire : l’exemple de Charles VIII
Dumont, Jonathan ULg; Marchandisse, Alain ULg

in Dumézil, Bruno; Vissière, Laurent (Eds.) Épistolaire politique I. Gouverner par les lettres (2014)

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See detailThe Horn of Africa, the Factors of a Unity. Wars, Cultures and Imperialisms (19-20th centuries)
Genin, Vincent ULg

in Literatures of the Horn of Africa (Ethiopia, Eritrea, Somalia, Djibouti) : Beyond the Language and the Territory (2014)

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See detailEvolution of clay fabric and water retention properties along hydromechanical stress paths
Dieudonné, Anne-Catherine ULg; Charlier, Robert ULg; Levasseur, Séverine ULg et al

in Numerical Methods in Geotechnical Engineering (2014)

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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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