References of "Paper published in a book"
     in
Bookmark and Share    
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 ▲]

Detailed reference viewed: 7 (2 ULg)
Full Text
Peer Reviewed
See detailEarly Jezirah 3b Pottery from Tell Beydar, Selected Inventories from latest excavation campaigns
Mas, Juliette ULg; Gavagnin, Katia

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 2: Excavation and Progress Reports, Posters (2014)

Since 1992, excavations at Tell Beydar have offered the opportunity to explore an urban centre of the Upper Khabur region. The extensive exploration of the EJZ 3b levels gave us access to the urbanism and ... [more ▼]

Since 1992, excavations at Tell Beydar have offered the opportunity to explore an urban centre of the Upper Khabur region. The extensive exploration of the EJZ 3b levels gave us access to the urbanism and the architecture of the city as well as its material culture, especially the pottery. The assemblages presented in this paper were exclusively found directly on the floors of various buildings (of a public, domestic, religious, offi- cial nature) and inside a grave. Most of these inventories consist of complete vessels discovered either intact or smashed but restorable. The aim of this paper is to investigate if, or to what extent, the intra-site distribution of the morphological repertoire of Beydar IIIb ceramic is related to its context of use. [less ▲]

Detailed reference viewed: 26 (3 ULg)
Full Text
Peer Reviewed
See detailLe référentiel quartiers durables : un nouvel outil d'aménagement durable en Wallonie
Marique, Anne-Françoise ULg; Teller, Jacques ULg

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

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

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

Detailed reference viewed: 34 (3 ULg)
Peer Reviewed
See detailLuminescence dating of ceramic building materials: application to the study of early medieval churches in north-western France and south-eastern England
Blain, Sophie ULg; Bailiff, Ian; Guibert, Pierre et al

in Martinón-Torres, Marcos (Ed.) Between craft and science: selected studies in archaeological ceramics (2014)

This study focuses on early medieval buildings in England and in France, specifically on those displaying the presence of brick in their masonry. The purpose was to determine whether medieval builders ... [more ▼]

This study focuses on early medieval buildings in England and in France, specifically on those displaying the presence of brick in their masonry. The purpose was to determine whether medieval builders reused Roman salvaged building materials or if the bricks used were contemporary to the building under construction. Thus luminescence dating was applied to bricks sampled from 11 standing Anglo-Saxon or Carolingian churches. The luminescence dates show that the two types of practice were in use in both countries. Where contemporary brickmaking appears to be the case, the study also provided a more precise chronology of the buildings. [less ▲]

Detailed reference viewed: 114 (15 ULg)
See detailEosinophilic Bronchopneumopathy
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014)

Detailed reference viewed: 14 (0 ULg)
Full Text
Peer Reviewed
See detailAt the Crossroads of Greek and Roman Medicine: The Contribution of Latin Papyri. 1. Medical Texts; 2. Iatromagical Papyri
de Haro Sanchez, Magali ULg; Marganne, Marie-Hélène ULg

in Maire, Brigitte (Ed.) "Greek" and "Roman" in Latin Medical Texts. Studies in Cultural Change and Exchange in Ancient Medicine (2014)

Detailed reference viewed: 24 (9 ULg)
Full Text
See detailNew finds of goniatite anaptychi from the Frasnian (Upper Devonian) of Belgium
Goolaerts, Stijn; Denayer, Julien ULg; Holemans, Tony et al

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

Detailed reference viewed: 5 (1 ULg)
See detailAnalysis of mass movements affecting the region of Constantine
Draidia, Salah ULg; Havenith, Hans-Balder ULg; Benabbas, C.

in EGU General Assembly Conference Abstracts (2014)

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

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

Detailed reference viewed: 8 (1 ULg)
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 ▲]

Detailed reference viewed: 8 (3 ULg)
Full Text
See detaileLearning COLEACP : un dispositif de formation au service des professionnels du secteur agricole en Afrique
Prunier, Emmanuelle; Le Hung, Florian; Schiffers, Bruno ULg

in ELearning Africa 2014 - Book of Abstracts (2014)

Le dispositif de formation à distance du COLEACP (Comité de Liaison Europe-Afrique-Caraïbes-Pacifique) est une composante d'un système complet de formation dédié au renforcement des capacités des ... [more ▼]

Le dispositif de formation à distance du COLEACP (Comité de Liaison Europe-Afrique-Caraïbes-Pacifique) est une composante d'un système complet de formation dédié au renforcement des capacités des opérateurs des filières agricoles des pays ACP (Afrique Caraïbes et Pacifique). [less ▲]

Detailed reference viewed: 25 (1 ULg)
Full Text
See detailQuantifier la charge de travail chez le jeune rugbyman? Pourquoi? Comment?
Paulus, Julien ULg; Laly, Arnaud

in Rassemblement National des Préparateurs Physiques (2014)

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

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

Detailed reference viewed: 21 (3 ULg)
Full Text
Peer Reviewed
See detailCompatibility of using TiO2 and the faecal near-infrared reflectance spectrometry for estimation of cattle intake
Vandermeulen, Sophie ULg; Decruyenaere, Virginie; Ramirez-Restrepo, Carlos Alberto et al

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

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

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

Detailed reference viewed: 36 (12 ULg)
Full Text
Peer Reviewed
See detailA Fast Newton-Raphson Method in Stochastic Linearization
Canor, Thomas ULg; Blaise, Nicolas ULg; Denoël, Vincent ULg

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

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

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

Detailed reference viewed: 41 (4 ULg)
Full Text
Peer Reviewed
See detailExperts’ opinions concerning the minimum content of a national household travel survey
Cools, Mario ULg; Armoogum, Jimmy; Diana, Marco

in Proceedings of the 10th International Conference on Transport Survey Methods (2014)

Although an extensive literature is available concerning the design of travel surveys, fewer research initiatives have been carried out to determine the content of the survey itself. The objective of the ... [more ▼]

Although an extensive literature is available concerning the design of travel surveys, fewer research initiatives have been carried out to determine the content of the survey itself. The objective of the present work is to identify such minimum set through a survey (MTSQ – Mini-Travel Survey Questionnaire) targeted to experts in this field. Moreover, it is investigated whether unanimity exists in the experts’ opinions concerning the importance of various types of questions and whether regional and/or professional differences exist. The MTSQ survey was successfully completed by 81 respondents in October-November 2012, mainly from Europe and North America. The study identified the most important questions, which should form the core of any NHTS. This list is especially useful for countries which do not yet have implemented a NHTS, and for defining the set of questions in case a harmonized household travel survey spanning across different countries will be initialized. Secondly, the paper investigated whether unanimity exists in the experts’ opinions. Our analyses clearly pinpointed different evaluations according to the experts’ characteristics, thus it could be concluded that unanimity is certainly not complete. Thus, whenever developing standards for travel surveys these differences should be taken into account, according to both the prospective data users the intended data usages. Especially the differences with respect to the regional context (North-American versus European), and involvement with the NHTS should be acknowledged. [less ▲]

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 26 (1 ULg)
Peer Reviewed
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.

Detailed reference viewed: 21 (1 ULg)
Full Text
Peer Reviewed
See detailBi-stable flow fields and two-way couplings between flow and sedimentation in shallow reservoirs
Dewals, Benjamin ULg; Peltier, Yann ULg; Pirotton, Michel ULg et al

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

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

Shallow reservoirs are structures commonly used in civil and environmental engineering. Recent experimental and numerical research has focused on the velocity fields and sediment deposits in rectangular shallow reservoirs. These analyses highlighted the existence of fascinating complex flow fields and sedimentation patterns, involving bi-stable flow fields and significant two-way couplings between flow and sedimentation in such reservoirs. We review here the findings of the latest research and present on-going developments. [less ▲]

Detailed reference viewed: 22 (6 ULg)
Full Text
Peer Reviewed
See detailLe fonti liturgiche di Peire d’Alvernhe, 'Deus, vera vida, verays' (BdT 323,16)
Valenti, Gianluca ULg

in Los que fan viure e treslusir l’occitan. Actes du Xème Congrès de l’Association Internationale d’Etudes Occitanes (Béziers, CIRDOC, 12-19/06/2011) (2014)

Full Text
Peer Reviewed
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)

Detailed reference viewed: 21 (4 ULg)
Full Text
Peer Reviewed
See detailFace à la globalisation : de l’interculturalité implicite à l’interculturalité engagée
Defays, Jean-Marc ULg

in EID, Cynthia; FADEL, Fady (Eds.) Interculturalité : Etat des lieux et perspectives, théories et pratiques (2014)

Detailed reference viewed: 56 (14 ULg)
Full Text
See detailNonlinear generalization of Den Hartog's equal peak method for nonlinear primary systems
Habib, Giuseppe ULg; Detroux, Thibaut ULg; Kerschen, Gaëtan ULg

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

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

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

Detailed reference viewed: 69 (16 ULg)
Full Text
Peer Reviewed
See detailDu texte littéraire au document : les connexions entre les papyrus littéraires et documentaires grecs et latins
Marganne, Marie-Hélène ULg

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

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

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

Detailed reference viewed: 27 (10 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 13 (3 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 34 (2 ULg)
Peer Reviewed
See detailÜber Möglichkeiten und Grenzen des Kulturtransfers. Günter Grass im Gespräch mit seinen Übersetzern
Letawe, Céline ULg

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

Detailed reference viewed: 19 (2 ULg)
Peer Reviewed
See detailMathematical formulations of shallow water models with porosity for urban flood modeling
Bruwier, Martin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in ICHE 2014 : 11th International Conference on Hydroscience & Engineering (2014)

Detailed reference viewed: 30 (7 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 56 (17 ULg)
Full Text
Peer Reviewed
See detailEfficient estimation of the high-order response statistics of a wind-excited oscillator with nonlinear velocity feedback
Denoël, Vincent ULg; Carassale, Luigi

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

Detailed reference viewed: 11 (1 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 16 (5 ULg)
Full Text
Peer Reviewed
See detailIl latino dell'Alcestis di Barcellona
Macedo, Gabriel 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 (2014)

Detailed reference viewed: 12 (0 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 40 (1 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 20 (0 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 79 (22 ULg)
Full Text
Peer Reviewed
See detailDe l'alimentation à la médecine : l'utilisation du vin dans les papyrus littéraires grecs et latins relatifs à la cuisine et à la médecine
Marganne, Marie-Hélène ULg

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

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

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

Detailed reference viewed: 46 (7 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 12 (0 ULg)
Full Text
Peer Reviewed
See detailConcrete repair bond: evaluation and factors of influence
Bissonnette, Benoît; Courard, Luc ULg; Garbacz, Andrzej et al

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

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

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

Detailed reference viewed: 19 (0 ULg)
Full Text
Peer Reviewed
See detailLOGIC : Un service GeoWeb d'aide à la décision et à la coopération des élus en matière d'implantations commerciales
Jaspard, Mathieu ULg

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

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailArbitrage et ordre public européen
Caprasse, Olivier ULg

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

Detailed reference viewed: 14 (1 ULg)
Full Text
See detailRéalisation d’un inventaire typologique et dendrochronologique des charpentes anciennes en région Bruxelles-Capitale
Weitz, Armelle ULg; Charruadas, Paulo ULg; Crémer, Sarah et al

in Chronique, Archaeologia Mediaevalis 37, Namur, 13-14 mars 2014 (2014)

Detailed reference viewed: 19 (5 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 62 (6 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 36 (7 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 65 (34 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 24 (1 ULg)
Peer Reviewed
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)

Detailed reference viewed: 14 (0 ULg)
Full Text
See detailRobust optimal rendezvous using differential drag
Dell'Elce, Lamberto ULg; Martinusi, Vladimir ULg; Kerschen, Gaëtan ULg

in Proceedings of the AIAA/AAS Astrodynamics Specialist Conference (2014)

The practical realization of the differential drag technique for orbital relative maneuvers must cope with the several and severe uncertainty sources affecting drag modeling. Neglecting these ... [more ▼]

The practical realization of the differential drag technique for orbital relative maneuvers must cope with the several and severe uncertainty sources affecting drag modeling. Neglecting these uncertainties might yield to oversimplified solutions whose representation of a real-life scenario is questionable. The first outcome of this study consists in the synthesis of a robust optimal controller which combines differential flatness theory and the scenario approach to generate a reference path which can be easily followed. The second outcome is the characterization of the relevant uncertainties of the differential drag problem, with a special focus on the aerodynamic force. The developments are validated in a highly detailed simulation environment including, among the perturbations, advanced drag modeling and coupled attitude and orbital dynamics. [less ▲]

Detailed reference viewed: 11 (3 ULg)
Full Text
See detailDesigning and testing an air-PCM heat exchanger for building ventilation application coupled to energy storage
Dechesne, Bertrand ULg; Gendebien, Samuel ULg; Martens, Jonathan et al

in 2014 Purdue Conferences Proceedings (2014)

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

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

Detailed reference viewed: 66 (13 ULg)
Full Text
See detailThe harmonic balance method for advanced analysis and design of nonlinear mechanical systems
Detroux, Thibaut ULg; Renson, Ludovic ULg; Kerschen, Gaëtan ULg

in Proceedings of the SEM IMAC XXXII (2014)

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

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

Detailed reference viewed: 132 (35 ULg)
Full Text
See detailThe Hangenberg Event (uppermost Famennian) in southern Belgium (Namur-Dinant Basin)
Mottequin, Bernard ULg; Poty, Edouard

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

Detailed reference viewed: 16 (0 ULg)
Full Text
Peer Reviewed
See detailAssessing the quality of Experimental Data with Gaussian Processes: Example with an Injection Scroll Compressor
Quoilin, Sylvain ULg; Schrouff, Jessica ULg

in Proceedings of the 2014 Purdue Conferences (2014)

This paper describes an experimental study carried out on a refrigeration scroll compressor with and without vapour injection. The test rig designed for that purposed allows evaluating the performance ... [more ▼]

This paper describes an experimental study carried out on a refrigeration scroll compressor with and without vapour injection. The test rig designed for that purposed allows evaluating the performance over a wide range of operating conditions, by varying the supply pressure, the injection pressure, the discharge pressure, the supply superheating and the injection superheating. 97 Steady-state points are measured, with a maximum isentropic efficiency of 64.1% and a maximum consumed electrical power of 13.1 kW. A critical analysis of the experimental results is then carried out to evaluate the quality of the data using a machine learning method. This method based on Gaussian Processes regression, is used to build a statistical operating map of the compressor as a function of the different inputs. This statistical operating map can then be compared to the experimental data points to evaluate their accuracy. [less ▲]

Detailed reference viewed: 22 (2 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
Peer Reviewed
See detailLes mots pour dire le goût: une construction historique et culturelle?, publié sous le titre "Les mots du goût. Lieux communs et réécritures"
Von Hoffmann, Viktoria ULg

in Verine, Bertrand (Ed.) Dire le non-visuel. Approche pluridisciplinaire des discours sur les perceptions autres que la vue (2014)

Detailed reference viewed: 76 (20 ULg)
Peer Reviewed
See detailA Conceptual Event-Tree Model for Coseismic Landslide Dam Hazard Assessment
Fan, X.; Huang, R.; van Westen, C. et al

in Landslide Science for a Safer Geoenvironment (2014)

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

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

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailHow and why did Hatshepsut invent the image of her royal power?
Laboury, Dimitri ULg

in Galan, José Manuel; Bryan, Betsy M.; Dorman, Peter F. (Eds.) Creativity and Innovation in the Reign of Hatshepsut (2014)

Detailed reference viewed: 38 (0 ULg)
Full Text
See detailMicromorph brachiopods from the Viséan (Carboniferous) of northwest Ireland
Mottequin, Bernard ULg; Sevastopulo, George; Simon, Eric

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

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailAssessing the Probability of Training Image-Based Geological Scenarios Using Geophysical Data
Hermans, Thomas ULg; Caers, Jef; Nguyen, Frédéric ULg

in Pardo-Iguzquiza, Eulogio; Guardiola-Albert, Carolina; Heredia, Javier (Eds.) et al Mathematics of Planet Earth - Proceedings of the 15th Annual Conference of the International Association for Mathematical Geosciences (2014)

In multiple-point statistics (MPS), the construction of training im-ages (TIs) is one of the most critical steps. Reliable geological studies may not always be available to depict with certainty what ... [more ▼]

In multiple-point statistics (MPS), the construction of training im-ages (TIs) is one of the most critical steps. Reliable geological studies may not always be available to depict with certainty what geological patterns or heterogeneity are present. In this context, geophysical techniques may provide additional information to reduce the possible large uncertainty in the understanding of prior geological scenarios. To overcome this problem, we developed a methodology to verify the consistency of geophysical data with independently-built TIs representing different plausible geological scenarios. If a TI is deemed consistent with the field geophysical survey, then in a sec-ond step we calculate a likelihood probability for each consistent TI. Our methodology starts by creating subsurface models with each TI. From these models we create synthetic geophysical data and from this synthetic data, synthetic inverted models. These models are now compared with a single inverted model obtained from the field sur-vey, allowing for our definition of what is “consistent”. To that ex-tent, we calculate the Euclidean distance between any two inverted models as well as field data and visualize the results in a 2D or 3D space using multidimensional scaling (MDS). With this technique, it is possible to verify if field cases fall in the distribution represented by synthetic cases, and thus are consistent with them. In a second step, we present a cluster analysis on the MDS-map to highlight which parameters are the most sensitive for the construction of TI. Based on this analysis, a probability of each geological scenario is computed through kernel smoothing of the densities in reduced pro-jected metric space. This approach was tested using electrical resistivity tomography as geophysical data to analyze TI scenarios for the Meuse alluvial aqui-fer (Belgium), where the lack of reliable sedimentological data lead to the definition of a multitude of geological scenarios, hence TIs. [less ▲]

Detailed reference viewed: 43 (17 ULg)
Full Text
Peer Reviewed
See detailExpansion urbaine et risques hydrologiques : cas de Butembo (RD Congo)
Sahani, Muhindo; Ozer, Pierre ULg; Moeyersons, Jan

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

Butembo constitue un cas typique de zone urbaine en région tropicale humide rencontrant une explosion démographique exceptionnelle. L’exode vers Butembo pour fuir l’insécurité dans la sous-région a ... [more ▼]

Butembo constitue un cas typique de zone urbaine en région tropicale humide rencontrant une explosion démographique exceptionnelle. L’exode vers Butembo pour fuir l’insécurité dans la sous-région a conduit à une rapide concentration spontanée des populations et à une urbanisation sans cesse croissante. L’imperméabilisation des vastes étendues de terres consécutive à cette expansion spatiale rapide de la ville a généré des problèmes environnementaux qui affectent la structure urbaine. La ville est actuellement confrontée à des risques hydrologiques diversifiés : ravinements progressifs et régressifs, inondations, et remobilisation d’anciens glissements de terrain. [less ▲]

Detailed reference viewed: 41 (2 ULg)
Full Text
See detailEnergetical aspects of solar-like oscillations in red giants
Grosjean, Mathieu ULg; Dupret, Marc-Antoine ULg; Belkacem, Kevin et al

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

Detailed reference viewed: 13 (1 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 58 (9 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 14 (0 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 30 (1 ULg)
Full Text
Peer Reviewed
See detailEvaluation of the mechanical integrity of a concrete surface by means of combined destructive methods
Courard, Luc ULg; Bissonnette, Benoît; Garbacz, Andrzej et al

in Grantham, Michael; Basheer, Muhammed; Magee, Bryan (Eds.) et al Proceedings of Concrete Solutions (2014)

As a tight bond between the repair and the old concrete is required, the soundness of the prepared surface has to be carefully assessed. This paper presents the results of an investigation intended to ... [more ▼]

As a tight bond between the repair and the old concrete is required, the soundness of the prepared surface has to be carefully assessed. This paper presents the results of an investigation intended to assess and compare quantitatively different test methods, namely the Schmidt rebound hammer, the pull-out test and the pull-off test, to evaluate superficial mechanical integrity of a substrate after concrete removal operations. Although it does not yield a precise evaluation of compressive strength, the Schmidt rebound hammer test is recognized as a useful tool for performing quick surveys to assess concrete uniformity. The pull-off test is very well correlated with the splitting-tensile test, but it is not suited for vertical and overhead surfaces. The Capo pull-out test has limited interest for surface preparation, as it is applicable to flat surfaces only. Conversely, the accelerated pull-out test showed interesting potential as a simple and relatively rapid means for assessing the mechanical integrity of a concrete surface prior to repair for any type of concrete surface. It appears from the results generated in this study that the combination Schmidt hammer / pull-off test could fill the needs for the evaluation of horizontal surfaces after concrete removal, while the combination Schmidt hammer / accelerated pull-out test could be used effectively on vertical and overhead surfaces. [less ▲]

Detailed reference viewed: 28 (0 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 27 (1 ULg)
Full Text
Peer Reviewed
See detailThe Relation Between The Food Price And The Climatic and Agricultural Factors In Republic of Niger
Andres, Ludovic ULg; Du Faux, Judith ULg; Lebailly, Philippe ULg

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

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

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

Detailed reference viewed: 13 (4 ULg)
Full Text
Peer Reviewed
See detailAn implementation of the generalized Maxwell viscoelastic constitutive model
Careglio, Claudio; Canales Cardenas, Cristian ULg; Papeleux, Luc ULg et al

in Bertolino, Graciela; Cantero, Mariano; Storti, Mario (Eds.) et al Mecánica Computacional Vol XXXIII (2014)

Viscoelastic problems deserve great interest in Computational Mechanics literature. In the last years different approaches have been proposed in order to model viscoelastic problems, as in the case of the ... [more ▼]

Viscoelastic problems deserve great interest in Computational Mechanics literature. In the last years different approaches have been proposed in order to model viscoelastic problems, as in the case of the generalized Maxwell model and its numerical implementation. In particular Kaliske and Rothert (M. Kaliske and H. Rothert, Comput. Mech., 19(3): 228-239 (1997)) discussed basic reological models and the formulation of a generalized Maxwell model and the corresponding implementation of three dimensional viscoelastic model both for small and large strain cases. The numerical implementation addressed by Kaliske and Rothert is quite simple for small strain case and can be extended to a large strain format amenable to be included in finite element codes SOGDE and Metafor. The implementation of the discussed model in a 1D constitutive model, written in Matlab, is addressed. The well known relaxation and creep tests are simulated and compared with analytical results. Furthermore, the influence of constitutive parameters on the viscoelastic response is discussed. In addition, the model is implemented in Finite Element codes and the obtained results are compared with the 1D ones. [less ▲]

Detailed reference viewed: 14 (5 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 24 (2 ULg)
Full Text
Peer Reviewed
See detailA Greener Common Agricultural Policy Towards 2020 And Its Implementation in Wallonia
Burny, Philippe ULg

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

ln order to implement the new Common Agricultural Policy agreed upon in 2013, the Walloon government had to make some choices, left to the Member States or the regions within them, which is the case in ... [more ▼]

ln order to implement the new Common Agricultural Policy agreed upon in 2013, the Walloon government had to make some choices, left to the Member States or the regions within them, which is the case in Belgium. ln January 2014, it was decided to implement the green payment (which is compulsory) proportionally to the basic payments, the payment for young farmers (compulsory) at its maximum authorized level (2% of the total envelope for direct payments), an additional payment for the first 50 hectares (payment which is left to the choice of the Member State/region), coupled payments (including 2.1 % of the regional envelope for direct payments for pastures and forage area), and the basic payment (compulsory, representing 26.7 % of the total regional envelope for direct payments only in Wallonia). [less ▲]

Detailed reference viewed: 3 (2 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 296 (14 ULg)
Full Text
Peer Reviewed
See detailMeandering jets in shallow rectangular reservoir
Peltier, Yann ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

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

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

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

Detailed reference viewed: 20 (7 ULg)
Peer Reviewed
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)

Detailed reference viewed: 62 (5 ULg)
Peer Reviewed
See detailEstetrol and neuroprotection against perinatal ischemic insult
Tskitishvili, Ekaterine ULg; Nisolle, Michelle ULg; Noël, Agnès ULg et al

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

Detailed reference viewed: 14 (0 ULg)
Peer Reviewed
See detailRamesside Registers of Égyptien de Tradition: the Medinet Habu Inscriptions
Gillen, Todd Jonathan ULg

in Grossman, Eitan; Polis, Stéphane (Eds.) New Directions in Egyptian Syntax (2014)

Detailed reference viewed: 34 (0 ULg)
Full Text
See detailSaisir l’évaluation de l’université en actes : interprétations et appropriations des parties prenantes.
Charlier, Nathan ULg; Vangeebergen, Thomas ULg

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

Detailed reference viewed: 44 (25 ULg)
Full Text
See detailL'élevage des ruminants, un élément clé de notre territoire
Hautier, Louis; Campion, Morgane; Ninane, Maxime ULg et al

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

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

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

Detailed reference viewed: 85 (12 ULg)
Full Text
Peer Reviewed
See detailRaymond Lemaire et la rénovation urbaine dans les années 1960-1970: entre théorie et pratique de la conservation
Houbart, Claudine ULg

in Aveta, Aldo, Di Stefano, Maurizio (Ed.) Roberto Di Stefano. Filosofia della Conservazione e prassi del Restauro (2014)

Detailed reference viewed: 53 (8 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 43 (13 ULg)
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)

Detailed reference viewed: 32 (12 ULg)
Full Text
Peer Reviewed
See detailComment les futurs enseignants du secondaire conçoivent-ils l’évaluation formative et ses difficultés de mise en œuvre ?
Goffin, Christelle ULg; Renson, Jean-Marie ULg; Fagnant, Annick ULg

in Actes du colloque : Cultures et politiques de l’évaluation en éducation et en formation. (2014)

Detailed reference viewed: 56 (7 ULg)
Full Text
See detailMILLI-INTERACTING DARK MATTER AND THE DIRECT-SEARCH EXPERIMENTS
Wallemacq, Quentin ULg

in Rencontres de Moriond 2014 : cosmology (2014)

Hydrogen-like dark atoms interact with standard matter because of two mixings, a kinetic mixing between standard photons and dark massless photons and a mass mixing of sigma mesons and dark scalars. After ... [more ▼]

Hydrogen-like dark atoms interact with standard matter because of two mixings, a kinetic mixing between standard photons and dark massless photons and a mass mixing of sigma mesons and dark scalars. After having thermalized in terrestrial matter, they reach underground detectors with thermal energies and form bound states with atoms in the active media, which causes the emission of photons that produce the observed signals. The model explains well the positive results from DAMA/LIBRA and CoGeNT without any contradiction with the null results from XENON100, LUX, CDMS-II/Ge and superCDMS. [less ▲]

Detailed reference viewed: 23 (2 ULg)
Full Text
Peer Reviewed
See detailAssessment of sedentary and mobile pastoralism dynamics in the region of Diffa (Niger)
Laouali, Abdoulkadri ULg; Yamba, Boubacar; Lebailly, Philippe ULg

in Dusan, Kovacevic (Ed.) Book of proceedings - Fifth International Scientific Symposium „Agrosym 2014“ (2014)

This paper builds on the article entitled “Pastoral dynamics in the Region of Diffa: descriptive analysis of livestock capital” published in the Proceedings Agrosym 2013. In view of its agro ecological ... [more ▼]

This paper builds on the article entitled “Pastoral dynamics in the Region of Diffa: descriptive analysis of livestock capital” published in the Proceedings Agrosym 2013. In view of its agro ecological characteristics, Diffa is a largely pastoral region in Niger. Livestock practiced by more than 95% of the population, is the dominant economic activity of local communities. It contributes around 55% of the annual GDP of the Region. To assess and understand the pastoral dynamics in the Region, a survey involving 300 households (150 households with sedentary herds and 150 households with mobile herds) was conducted during the first half of 2012. The paper attempts to capture, from the responses of households surveyed, livestock trends in the Region of Diffa over a period of six years (2007 to 2012). Analysis of results, at least regarding households who provided comprehensive responses, shows reduced livestock over the relevant period with variances according to species. Data cross analysis highlights the occurrence of recurrent fodder deficits, attributable to a series of annual rainfall deficits as well as animal diseases as the main cause of reduced sizes of the herds of households surveyed. [less ▲]

Detailed reference viewed: 18 (4 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 21 (5 ULg)
Full Text
See detailStratigraphy and depositionnal settings of the Late Famennian of Southern Belgium - a snapshot of the palaeoenvironment for late Devonian tetrapods and arthropods
Denayer, Julien ULg; Prestianni, Cyrille; Olive, Sébastien et al

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

Detailed reference viewed: 8 (0 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 20 (0 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 36 (2 ULg)
Full Text
Peer Reviewed
See detailL'art de la guigne en 1862. Contexte, intertexte et sous-texte du Guignon de Mallarmé
Durand, Pascal ULg

in Brissette, Pascal; Luneau, Marie-Pier (Eds.) Deux siècles de malédiction littéraire (2014)

Deuxième texte en vers publié par Mallarmé, dans la revue L'Artiste, alors dirigée par Arsène Houssaye, qui n’en retint que les cinq premiers tercets, Le Guignon place l’entrée de son auteur dans le champ ... [more ▼]

Deuxième texte en vers publié par Mallarmé, dans la revue L'Artiste, alors dirigée par Arsène Houssaye, qui n’en retint que les cinq premiers tercets, Le Guignon place l’entrée de son auteur dans le champ poétique sous le signe d’une malédiction d’aspect très convenu, tant y paraît bien saturé l’appareil des clichés assimilant élection poétique et ratage social. La banalité du propos, gage donné aux pairs d’une adhésion fervente aux normes à quoi la plupart d’entre eux se rangent au milieu du Second Empire, y prend cependant une tournure assez singulière, témoignant d’un jeu avec les codes autant que d’une soumission à ceux-ci. Ce jeu passe par un complexe montage intertextuel articulant, au registre de la malédiction poétique, les apports d’un Nerval, d’un Gautier, d’un Baudelaire et d’un Cladel ; il passe aussi par une tonalité grotesque et paroxystique, reflet d’une distance prise à l’égard de l’imaginaire collectif ainsi synthétisé et d’une extériorisation critique de structures littéraires puissamment incorporées, au prix d’un point de vue tout ensemble interne et externe pris sur ces structures. Texte fondamentalement trivial — à tous les sens du terme —, Le Guignon tient ainsi, à la fois, de la récitation d’un credo et d’une sorte de physiologie des poètes post-romantiques. [less ▲]

Detailed reference viewed: 119 (46 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 27 (10 ULg)
Peer Reviewed
See detailDe constructione - de consecratione ecclesiae Hoyensis (1066)
George, Philippe ULg

in Hortus Artium Medievalium vol. 20/2 (2014)

All the history books on the Middle Ages mention the famous « Charter of Huy from 1066 », the oldest surviving example of a freedoms charter north of the Alps. In granting this freedoms charter to the ... [more ▼]

All the history books on the Middle Ages mention the famous « Charter of Huy from 1066 », the oldest surviving example of a freedoms charter north of the Alps. In granting this freedoms charter to the citizens of Huy, Théoduin, the Bishop of Liège, (1048- 1075) obtained in exchange the financial resources to achieve his objectives: the rebuilding of Huy-sur-Meuse and its collegiale church, which had been destroyed and ruined in 1053 by the count of Flanders. At the same time, the prelate was readying his own sepulture. On August 1066, the grandiose inauguration ceremonies were held in the new church. The eulogy of this monument of Huy De constructione – de consecratione ecclesiae Hoyensis is missing, but the interdisciplinary approach makes it possible today to reconsider the matter: history, hagiography, architecture, art, liturgy and the sacred spatialization. [less ▲]

Detailed reference viewed: 27 (2 ULg)
Full Text
Peer Reviewed
See detailLe miroitement des mots
Verbeeck, Muriel ULg; Buyle, Marjan

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

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 34 (5 ULg)
Full Text
See detailImpact of shading on meiofauna in a Posidonia oceanica meadow
Pete, Dorothée ULg; Gobert, Sylvie ULg

in Lepoint, Gilles; Michel, Loïc; Schnitzler, Joseph (Eds.) et al Zoology 2014 (2014)

Posidonia oceanica meadow is an endemic ecosystem of the Mediterranean coasts. A known threat to this ecosystem is aquaculture. In zones of intensive fish production, P. oceanica meadow tends to be less ... [more ▼]

Posidonia oceanica meadow is an endemic ecosystem of the Mediterranean coasts. A known threat to this ecosystem is aquaculture. In zones of intensive fish production, P. oceanica meadow tends to be less healthy or to disappear .One of the reasons for this is a decrease in the light that reaches the leaves (direct shading, increase of water turbidity or of epiphytic algae density). Unfortunately, when the meadow begins to die, it is often too late to act. So, people are trying to find indicators that react early to this kind of perturbations. In this framework, this study focuses on the impact of shading (without nutrient enrichment) on the meiofauna living in the surface sediment of a P. oceanica meadow. An in situ shading experiment was led from the end of May to the end of August 2009, at a depth of 10 m, in a reference P. oceanica meadow. Three shading nets were put in the meadow to reach a light extinction of 50%. A control site was also defined. The first two centimetres of sampled sediment cores were studied. After three months of shading, the total abundance of meiofauna at the shading site was lower than at the beginning of the experiment, while it stayed around the same level at the control site. This difference is mainly due to a decrease in the total number of foraminiferans, nematods, gnathostomulids, copepods and bivalves. However, no significant difference in diversity was observed. At the end of this experiment, it appeared that, contrarily to what is mostly said in the literature, the direct organic enrichment that occurs at fish farms is not the only reason to the modification of the meiofauna communities of the ecosystem. The shading by itself has also an effect. [less ▲]

Detailed reference viewed: 9 (1 ULg)
Full Text
Peer Reviewed
See detailLe corps du Prince. La perception de l'Egypte ancienne
Winand, Jean ULg

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

Detailed reference viewed: 48 (2 ULg)
Full Text
Peer Reviewed
See detailLes dieux et la cité. Représentations des divinités tutélaires entre Grèce et Phénicie
Bonnet, Corinne; Pirenne-Delforge, Vinciane ULg

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

Detailed reference viewed: 98 (4 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 100 (10 ULg)
Peer Reviewed
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)

Detailed reference viewed: 85 (9 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 41 (10 ULg)
Full Text
Peer Reviewed
See detailNuisibilité de la cécidomyie équestre, Haplodiplosis marginata (von Roser) et protection du blé tendre d'hiver
Censier, Florence ULg; Chavalle, Sandrine; San Martin y Gomez, Gilles et al

in AFPP - 10ème Conférence Internationale sur les Ravageurs en Agriculture (2014)

These last years, the resurgence of the saddle gall midge, Haplodiplosis marginata (von Roser), has been observed in several European countries and this pest has sometimes inflicted severe damage in ... [more ▼]

These last years, the resurgence of the saddle gall midge, Haplodiplosis marginata (von Roser), has been observed in several European countries and this pest has sometimes inflicted severe damage in cereals. Trials were conducted in heavily infested fields to assess its nuisibility to winter wheat crops. For this purpose, protection schemes including one to four successive applications of lambda-cyhalothrin allowed to vary the exposure period of wheat to the saddle gall midge. The impact of the pest on yield was substantial and closely correlated to the number of galls induced on stems. These trials also showed the importance to synchronize insecticide sprayings with flights to obtain a good efficacy. Eventually they revealed that applying insecticide at the moment of first flights could in some cases reach the larvae still present in the soil. [less ▲]

Detailed reference viewed: 14 (3 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 47 (7 ULg)