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See detailGeophysical characterisation of a former waste disposal site in the context of landfill mining
Dumont, Gaël ULg; Robert, Tanguy ULg; Pilawski, Tamara et al

in EarthDoc - Near Surface Geoscience 2013 – 19th European Meeting of Environmental and Engineering Geophysics (2013, September 11)

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See detailComment gérer la nutrition artificielle chez un patient diabétique ?
PAQUOT, Nicolas ULg; DE FLINES, Jenny ULg; Preiser, Jean-Charles

in Journée de développement professionnel continu de la SFNEP (2013, September 11)

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See detailAn efficient formulation for the simulation of elastic wave propagation in 1-dimensional collinding bodies
Depouhon, Alexandre ULg; Detournay, Emmanuel; Denoël, Vincent ULg

in Proceedings of the 11th International Conference on Vibration Problems (2013, September 09)

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See detailCity pattern as a factor influencing the impact of urbanization on ecosystems - A diachronic analysis of the dynamic of two cities: Kisangani and Lubumbashi (Democratic Republic of Congo)
Andre, Marie ULg; Mahy, Grégory ULg; Lejeune, Philippe ULg et al

in Nunes Silva, Carlos (Ed.) Colonial and postcolonial urban planning in Africa (2013, September 06)

The patterns and dynamics of two cities between two years (2002 and 2010 for Kisangani; 2002 and 2008 for Lubumbashi, both part of the Democratic Republic of Congo) have been examined in order to estimate ... [more ▼]

The patterns and dynamics of two cities between two years (2002 and 2010 for Kisangani; 2002 and 2008 for Lubumbashi, both part of the Democratic Republic of Congo) have been examined in order to estimate how they influence the impact of extension and/or of densification on urban internal and peripheral ecosystems. For each city two SPOT 5 images were classified with a oriented-object supervised approach; then composition landscape metrics (built area proportion index, anthropized surface proportion index, equitability index of area proportion of classes, dominant class index, dominant class proportion index) have been evaluated in order to 1) identify the extend of each area (urban, suburban, rural) within the urban-rural gradient, 2) quantify the most commonly cited morphological characteristics to describe these different areas and 3) quantify the dynamic of the different areas during this decade. Landscape ecology assumes that the landscape pattern description is important because, according to the central hypothesis called “pattern-process paradigm”, the ecological processes influence landscape structure and vice versa. Composition metrics, which are commonly used in landscape ecology, describe the pattern among other things in quantifying the presence and the number of patches from the various classes within the landscape. This study singularizes itself from the subjective ones by its quantified and objective approach. The similarities and differences between these cities, relevance and gaps in the method have then been identified and discussed. The results of this study are aimed to be used by urban planners for the evaluation of the potential resistance of internal and peripheral natural ecosystems to the extension and/or the densification of a given city, taking into account its pattern and dynamic. It might help them in their choice between different planning alternatives. [less ▲]

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See detailVIRTUAL LEODIUM: FROM AN HISTORICAL 3D CITY SCALE MODEL TO AN ARCHAEOLOGICAL INFORMATION SYSTEM
Pfeiffer, Michelle ULg; Carré, Cyril ULg; Delfosse, Vincent ULg et al

in Grussenmeyer (Ed.) ISPRS Annals – Volume II-5/W1, 2013 (2013, September 03)

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See detailMagnetic fields in beta Cep, SPB, and Be stars
Schoeller, M.; Hubrig, S.; Briquet, Maryline ULg et al

in Proceedings of the Conference: "Putting A Stars into Context: Evolution, Environment, and Related Stars" (2013, September 01)

Recent observational and theoretical results emphasize the potential significance of magnetic fields for structure, evolution, and environment of massive stars. Depending on their spectral and photometric ... [more ▼]

Recent observational and theoretical results emphasize the potential significance of magnetic fields for structure, evolution, and environment of massive stars. Depending on their spectral and photometric behavior, the upper main-sequence B-type stars are assigned to different groups, such as beta Cep stars and slowly pulsating B (SPB) stars, He-rich and He-deficient Bp stars, Be stars, BpSi stars, HgMn stars, or normal B-type stars. All these groups are characterized by different magnetic field geometry and strength, from fields below the detection limit of a few Gauss up to tens of kG. Our collaboration was the first to systematically study the magnetic fields in representative samples of different types of main-sequence B stars. In this article, we give an overview about what we have learned during the last years about magnetic fields in beta Cep, SPB, and Be stars. [less ▲]

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See detailCaractérisation expérimentale et modélisation des conditions de mise en suspension homogène d’un solide dans une cuve agitée industrielle
Calvo, Sébastien ULg; Delafosse, Angélique ULg; Collignon, Marie-Laure ULg et al

in Récents Progrès en Génie des Procédés (Cd-ROM) (2013, September)

In this work, we study the conditions needed to reach homogeneous distribution of solid particles of aluminium salts in water inside a GRC bottom shape stirred tank of 70L equipped with Pfaudler RCI type ... [more ▼]

In this work, we study the conditions needed to reach homogeneous distribution of solid particles of aluminium salts in water inside a GRC bottom shape stirred tank of 70L equipped with Pfaudler RCI type impeller and three equispaced vertical baffles. The aim of the present study is to develop a CFD model describing the quality of particle distribution at the industrial scale. This model, validated with experimental data, is afterward used to developed scale-up and scale-down correlation to predict the minimum impeller speed needed to reach homogeneous solid distribution Nhs. The commercial CFD tool Fluent 14 is used to model the fluid flow and the solid particle distribution in the tank. The 3D geometry of the tank and the associated mesh are realized respectively by Ansys 14 DesignModeler and Meshing. The Sliding-Mesh approach is used to take into account the impeller motion. Assuming that only the continuous phase is present, the fluid flow dynamics may be simulated independently using the wellknown k-ε turbulence model. The behaviour of the liquid-solid mixture is then described implementing the Eulerian Mixture model. Liquid velocity fields simulated by CFD have been validated by comparison with PIV (Particle Image Velocimetry) measurements. Computed Nhs is well compared to experimental data obtained with a nephelometric probe. Results obtained at different scales allowed correlating Nhs and volumetric power consumption. [less ▲]

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See detailA heat injection and pumping experiment in a gravel aquifer monitored with crosshole electrical resistivity tomography
Hermans, Thomas ULg; Wildemeersch, Samuel ULg; Jamin, Pierre ULg et al

in EarthDoc - Near Surface Geosciences 2013 - 19th European Meeting of Environmental and Engineering Geophysics (2013, September)

Thermal tracing experiments are becoming common in hydrogeology to estimate parameters governing heat transport processes and to study geothermal reservoirs. Electrical resistivity tomography (ERT) has ... [more ▼]

Thermal tracing experiments are becoming common in hydrogeology to estimate parameters governing heat transport processes and to study geothermal reservoirs. Electrical resistivity tomography (ERT) has proven its ability to monitor salt tracer tests, but few studies have investigated its performances in thermal tracing experiments. In this study, we monitor the injection and pumping of heated water using crosshole ERT in a panel crossing the main flow direction. Difference inversion time-lapse images clearly show the heterogeneous pattern of resistivity changes, and thus temperature changes, highlighting the existence of preferential flow paths in the aquifer. Comparison of temperature estimates from ERT and direct measurements in boreholes show the ability of ERT to quantify the temperatures in the aquifer and to draw the breakthrough curves of the thermal tracer with a relative accuracy. Such resistivity data may provide important information to improve hydrogeological models. Our study proves that ERT, especially crosshole ERT, is a reliable tool to follow thermal tracing experiments. It also confirms that ERT should be included to in situ techniques to characterize heat transfer in the subsurface and to monitor geothermal resources exploitation. [less ▲]

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See detailTRANSITION TO PARENTHOOD IN LESBIAN PARENTS FAMILIES: A CASE STUDY
Miscioscia, Marina ULg; D'Amore, Salvatore ULg; Delvoye, Marie

in 16th European Conference on Developmental Psychology Abstract Book (2013, September)

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See detailPapyrologie latine et bilinguisme gréco-latin : des perspectives nouvelles
Rochette, Bruno ULg

in Marganne, Marie-Hélène; Rochette, Bruno (Eds.) Bilinguisme et digraphisme dans le monde gréco-romain (2013, September)

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See detailSimulation of a cold climate heat pump furnished with a scroll compressor with multiple injection lines
Bell, Ian ULg; Groll, Eckhard; Braun, James et al

in Proceedings of the International Conference on Compressors and their Systems 2013 (2013, September)

A detailed scroll compressor simulation has been developed as described in a companion paper. In this work, the compressor simulation code is used to investigate vapor injection in scroll compressors for ... [more ▼]

A detailed scroll compressor simulation has been developed as described in a companion paper. In this work, the compressor simulation code is used to investigate vapor injection in scroll compressors for cold climate heat pumps. The required analysis is developed for vapor injection in scroll compressors with one or two injection lines. The improvement in heat pump efficiency at a -20 C evaporation temperature with one injection line is as much as 10% while with two injection lines the increase in efficiency can be as much as 16% [less ▲]

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See detailRESILIENCE TO FLOODING – DRAFT BUILDING CODE
Clarkson, John; Rigo, Philippe ULg; Braun, Desoto-Duncan, Forsyth, de Gijt, Huber6, Miller, Sullivan, WG139

in International Conference on Flood Resilience (ICFR) : Experiences in Asia and Europe (2013, September)

A significant issue associated Flood Defence Systems (FDS) is the difficulty of predicting how these structures will behave when inevitably they have been loaded beyond their designed capacity by a flood ... [more ▼]

A significant issue associated Flood Defence Systems (FDS) is the difficulty of predicting how these structures will behave when inevitably they have been loaded beyond their designed capacity by a flood. The flood can cause these structures to fail catastrophically with loss of life and substantial damage to property. For a limited incremental investment, by including resilient features shown in this document, the FDS can dramatically lessen the chances for loss of life and property damage. While not a building code, the following provides guidance on how to improve the resilience of FDS so they will not fail catastrophically when overloaded beyond their designed capacity. Of all “lessons learnt” most important is to explicitly incorporate the consequences of failure and the possibility of being wrong in one's assumptions into the design process. Building in the flood plain will always have risk; the public should not become over confident just because a FDS is place. While it is recognized that an Integrated Water Basin perspective would include retention zones, restricted developments in flood plains, land use planning, awareness raising, flood resistant construction, drainage and water storage improvement, effective evacuation planning and other measures. [less ▲]

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See detailEquivalent static wind loads for structures with non-proportional damping
Blaise, Nicolas ULg; Canor, Thomas ULg; Denoël, Vincent ULg

in Zingoni, A (Ed.) Fifth International Conference on Structural Engineering, Mechanics & Computation (2013, September)

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See detailLe CEDOPAL et les papyrus latins: pour une mise à jour du Corpus Papyrorum Latinarum de Robert Cavenaile
Marganne, Marie-Hélène ULg

in Marganne, Marie-Hélène; Rochette, Bruno (Eds.) Bilinguisme et digraphisme dans le monde gréco-romain: l'apport des papyrus latins. Actes de la Table Ronde internationale (Liège, 12-13 mai 2011) (2013, September)

Since 2008, the Centre de Documentation de Papyrologie Littéraire (CEDOPAL) of the University of Liège has undertaken to update the Corpus Papyrorum Latinarum (CPL) published fifty years ago by the late ... [more ▼]

Since 2008, the Centre de Documentation de Papyrologie Littéraire (CEDOPAL) of the University of Liège has undertaken to update the Corpus Papyrorum Latinarum (CPL) published fifty years ago by the late Robert Cavenaile. This paper seeks to trace the history of the CPL, the steps of the updating, the methods used, the desired goals and challenges. [less ▲]

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See detailProteomic study of lumbar spinal cord after quadricipital eccentric exercise
Lacrosse, Zoé ULg; Lacrosse, Zoé ULg; Hody, Stéphanie ULg et al

in 17th EURON PhD meeting (2013, September)

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See detailLa problématique des dispensés au cours d’éducation physique : analyse des représentations des enseignants en Belgique francophone
Van Hoye, Martin ULg; Cloes, Marc ULg

in Carnel, Béatrice; Moniotte, Julien (Eds.) Intervention, Recherche et Formation: Quels enjeux, quelles transformations? (2013, September)

Souvent, les enseignants en éducation physique se plaignent du nombre de dispensés et/ou d'absents constaté lors de leurs leçons et l'associent à un manque de motivation. Toutefois, ces plaintes sont ... [more ▼]

Souvent, les enseignants en éducation physique se plaignent du nombre de dispensés et/ou d'absents constaté lors de leurs leçons et l'associent à un manque de motivation. Toutefois, ces plaintes sont souvent assez abstraites. C'est pourquoi, dans cette étude, nous avons tenté de concrétiser le ressenti des enseignants en les interrogeant directement. Respectant les principes de l’approche écologique, cette recherche vise donc à enrichir les connaissances relatives à la problématique des dispensés en éducation physique en se basant sur l’analyse des perceptions des enseignants. Nous avons utilisé un questionnaire afin d’identifier l’importance de la non-participation lors des leçons d’éducation physique et les variables qui en seraient responsables. Dans le cadre d’un échantillonnage de convenance, les réponses ont été collectées lors de formations continues, dans des écoles et par l’intermédiaire d’une association professionnelle. Au total, 232 réponses (50% d’hommes et de femmes ayant en moyenne 18,6 années d’ancienneté dans l’enseignement) ont été encodées dans une base de données et traitées (Statistica, StatSoft, 2010). En moyenne, selon les estimations des enseignants, 82,4% des élèves seraient actifs lors des leçons d’éducation physique. Ce chiffre varie en fonction du réseau d’enseignement dans lequel on se trouve mais également de l’ancienneté de l’enseignant, confirmant les propos de Carlier et Brunelle (1998). Les enseignants mettent également en évidence que la non-participation est essentiellement liée à des problèmes médicaux rencontrés par les élèves. Ils considèrent d’ailleurs que les excuses médicales n’étant pas couvertes par un certificat seraient même presque aussi importantes quantitativement que celles qui le sont. Enfin, l’oubli de l’équipement représente la troisième raison de non-participation des élèves mentionnée par les enseignants. D’après ces derniers, l’âge des élèves aurait peu d’influence. Plusieurs implications pratiques sont formulées à partir des résultats. [less ▲]

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See detailExperimental performance characterization of a new single room ventilation device with heat recovery
Gendebien, Samuel ULg; Georges, Emeline ULg; Prieels, Luc et al

in Proceedings of the 34th AIVC conference (2013, September)

Nowadays, important efforts are made to reduce the residential building energy consumption. In this context, a growing interest for heat recovery ventilation has been observed during the last decades. The ... [more ▼]

Nowadays, important efforts are made to reduce the residential building energy consumption. In this context, a growing interest for heat recovery ventilation has been observed during the last decades. The present paper focuses on a new single room ventilation with heat recovery. Double flow ventilation is achieved through the integration of the unit into windows ledges. The developed device is particularly suitable compared to traditional centralized heat recovery ventilation units for retrofitted houses due to the absence of air extracting and air pulsing ducts through the house. The first part of the paper consists in describing the characteristics and properties of the developed device (volume, components, flow configuration, advantages and drawbacks). In the second part of the paper, an experimental approach is presented to characterize the unit. The criteria of performance are based on: - Thermal effectiveness of the unit (testing of a recovery heat exchanger), - Hydraulic aspects (flows delivered by the unit vs energy supplied to the unit), - Acoustic aspects. The overall performance of the unit can be established based on the experimental results described here above. Cartography of performance (ratio between the recovered heat and the supply electrical power) can be drawn, depending on the flow rates delivered by the unit and the indoor/outdoor temperature difference. The last part of the paper compares the new system with natural, simple exhaust ventilation and traditional centralized systems in terms of primary energy, consumer price and carbon dioxide emissions. Results show that the presented device seems more competitive than natural and simple exhaust ventilation for the Belgian climate. The single room ventilation investigated in this paper also shows better performance than most of the centralized ventilation systems tested on site. [less ▲]

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See detailMeasuring the Usability and Effectiveness of CAAD Tools and Applications
Attia, Shady ULg; Andersen, Marilyne

in Proceeding of the Education and research in Computer Aided Architectural Design in Europe Conference (2013, September)

Computer Aided Architectural Design (CAAD) decisions and judgments have been at the heart of architectural design practice. Despite the increasing popularity of computer aided design applications ... [more ▼]

Computer Aided Architectural Design (CAAD) decisions and judgments have been at the heart of architectural design practice. Despite the increasing popularity of computer aided design applications, measuring the decision making of designers empirically remains elusive. Past research claiming usefulness of the CAD has relied largely on anecdotal or case studies that are vulnerable to bias. The study reviews results of prior investigations. The relatively few laboratory experiments report hardly any empirical results regarding the measurement of CAD decision making. The study provides an overview of the literature of existing measurement methods that have been used in psychology and neuroscience to assess individual variations in design making, and highlight these different measurement methods’ strengths and weaknesses. We conclude with a comparative evaluation of the different measures and provide suggestions regarding their constructive use in building realistic theories of designer’s decision making measurement. [less ▲]

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See detailAnalyse de parcours d'entraîneurs belges de haut niveau. Application de l'approche narrative
Theunissen, Catherine ULg; Dosquet, Thibaut; Cloes, Marc ULg

in Carnel, Béatrice; Moniotte, Julien (Eds.) Intervention, Recherche et Formation: Quels enjeux, quelles transformations? (2013, September)

Beaucoup d'entraîneurs rêvent d'une carrière dans le sport de haut niveau. Connaître les secrets de ceux qui atteignent les sommets présente un attrait indéniable pour les praticiens. Les recettes du ... [more ▼]

Beaucoup d'entraîneurs rêvent d'une carrière dans le sport de haut niveau. Connaître les secrets de ceux qui atteignent les sommets présente un attrait indéniable pour les praticiens. Les recettes du succès sont difficilement définies et la qualité d'un entraîneur ne repose généralement que sur les résultats des sportifs et la reconnaissance par les pairs (Terisse, 1998). Notre investigation vise à mettre en évidence des éléments décisifs dans le parcours d'entraîneurs belges francophones de haut niveau à travers le récit de leur vie. L'approche narrative (Lemyre & Trudel, 2004 ; Von Rotz, 2004) a été utilisée avec des entraîneurs de sports collectifs (n=4) et individuels (n=4) en laissant la liberté aux sujets de mettre en évidence les éléments de son contexte qu'il considère comme essentiels. Une analyse de contenu des interviews a ensuite été menée via un système de catégorisation des verbatims. La fidélité inter- et intra-analystes a révélé un taux d'accord satisfaisant (89 et 95%). Généralement anciens sportifs, les entraineurs de haut niveau ont le plus souvent franchi le cap par hasard. Ils ont ensuite évolué en encadrant des équipes de jeunes, ce qui leur a permis de connaitre les différentes étapes de l'apprentissage. Les rencontres avec d'autres praticiens ont alimenté leurs connaissances. Les formations suivies les ont amenés à évoluer au même titre que leur réflexion et la consultation de différents ouvrages de référence. Même s'ils déclarent afficher un caractère bien trempé, ils misent sur une compétence en psychologie pour assouplir les relations humaines tout veillant à maintenir la rigueur à la tâche. Ils ne comptent pas sur la chance et parlent plutôt de réussite en se souciant de chaque détail, pour limiter le hasard. Ces résultats sont en congruence avec Wright, Trudel & Culver (2007) qui déclarent que chaque situation vécue joue immanquablement un rôle dans la formation des entraîneurs. [less ▲]

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See detailManaging acute myopathies
Votion, Dominique ULg

in In proceedings: 51th British Equine Veterinary Association (BEVA) Congress (2013, September)

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See detailEffects of omeprazole on the canine cerebrospinal fluid composition
Girod, Maud ULg; Allerton, Fergus; Gommeren, Kris ULg et al

in Proceedings of the 23rd ECVIM-CA CONGRESS (2013, September)

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See detailSurveillance of serotypes and antimicrobial susceptibility profile in group B streptococcus (GBS) in Belgium
Melin, Pierrette ULg; SACHELI, Rosalie ULg; Sarlet, Gilles ULg et al

in Program and Abstract of the 53rd Intersciences Conference on Antimicrobial Agents and Chemotherapy. Washington, USA: ASM. (2013, September)

BACKGROUND Today GBS vaccines for prevention of severe neonatal disease through transplacental delivery of antibodies directly from immunized mothers are in advanced stage of development. For the ... [more ▼]

BACKGROUND Today GBS vaccines for prevention of severe neonatal disease through transplacental delivery of antibodies directly from immunized mothers are in advanced stage of development. For the introduction of any GBS vaccine there are urgent needs for pre and post vaccine enhanced surveillance studies of strains isolated from both neonatal diseases and vagino-rectal colonization of pregnant women. In Belgium, surveillance of invasive isolates is regularly done by the NRC. We report in this study a surveillance of colonizing isolates of GBS. METHODS In 2012, 344 GBS isolates were obtained from a Belgian surveillance for vagino-rectal colonization among pregnant women (max. 5 isolates/lab). Capsular types were determined by agglutination (Strep-B-latex, SSI, Denmark) and MICs by using a microdilution method (Sensititre) and Etest® (EUCAST interpretive criteria). Furthermore, for the erythromycin (E) resistant (R) isolates, the inducible (iMLS), constitutive (cMLS) and M phenotypes were assessed by a double-disk diffusion test. RESULTS Serotype III was the more common (27.6%) followed by V, II, Ia, Ib, IV, IX, VII and VI (18.1%, 16.4%, 13.4%, 7%, 4.7%, 2.5%, 0.8%, 0.5%) and 8.9% were non typable. All isolates were susceptible to penicillin ; 29% were R to E with a higher rate among serotypes IV and V (p<0.05). Among these E-R isolates, 93% exhibited the MLS phenotype (R to E and CC): 66% were cMLS with E MIC50>256 mg/L and 27% iMLS with E MIC50/MIC90 2/>8 mg/L. The M phenotype (R to E and S to C) was expressed by 7% of E-R isolates with E MIC50/MIC90 2/4 mg/L. CONCLUSION Compared with Belgian data relating to neonatal invasive strains (NRC reports) 1) Serotype V and II are more frequent and III less frequent among colonizing isolates 2) Prevalence of E-R is similar in percentage and phenotypes with the MLS R phenotype as major mechanism. Extended surveillance of both invasive and colonizing isolates is needed currently to prepare the follow-up in the future vaccine era. [less ▲]

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See detailRelation between indoor thermal environment and renovation in Liege residential buildings
Singh, Manoj Kumar ULg; Mahapatra, Sadhan; Teller, Jacques ULg

in Matijašević, Sunčana; Ban, Marko (Eds.) Conference Digital proceedings (2013, September)

Indoor thermal environment monitoring has been done in 20 residential buildings of Liege city followed by questionnaire based comfort survey amongst the occupants of 85 houses in order to record their ... [more ▼]

Indoor thermal environment monitoring has been done in 20 residential buildings of Liege city followed by questionnaire based comfort survey amongst the occupants of 85 houses in order to record their preference and expectations about indoor thermal environment in winter and spring season. It is found from the analysis that change of glazing has a minimum or even sometimes an adverse effect on the existing indoor environment due to the absence of proper insulation of the rest of the building envelope. It is observed that in winter there is a sudden drop in indoor temperature and also overheating in summer. This is due to unplanned installation of glazing which actually increases the fenestration area ratio leading to higher indoor temperature fluctuation and causes discomfort. It is also important that the occupant’s preference and expectations as well as overall assessment of indoor environment needs to be consider towards energy efficiency improvement. [less ▲]

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See detailBauschinger effect in thin metallic films by Fem simulations
marandi, kianoosh; vayrette, renaud; Pardoen, Thomas et al

in XII International Conference on Computational Plasticity. Fundamentals and Application COMPLAS XII , Barcelone 3-5 septembre 2013 (2013, September)

Unpassivated free-standing gold and aluminium thin films, subjected to tensile tests show Bauschinger effect (BE) during unloading [1,2]. The focus of this work is to investigate the effect of ... [more ▼]

Unpassivated free-standing gold and aluminium thin films, subjected to tensile tests show Bauschinger effect (BE) during unloading [1,2]. The focus of this work is to investigate the effect of microsstructural heterogeneity such as grain sizes on the BE and the macroscopic deformation behavior in thin metallic films. The finite element code LAGAMINE is used to model the response of films involving sets of grains with different strenghts. The numerical results are compared with experimental results from tensile tests on aluminium thin films from the work of Rajagolapan, et al. [2] [less ▲]

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See detailFrom zero-energy building to zero-energy neighbourhood : urban form and mobility matter.
Marique, Anne-Françoise ULg; Penders, Marine ULg; Reiter, Sigrid ULg

in Proceedings PLEA 2013 (2013, September)

Zero-Energy” Building (ZEB) is arousing more and more interest internationally, both in policies aiming at a more sustainable built environment (such as the European Directive PEB that will require, for ... [more ▼]

Zero-Energy” Building (ZEB) is arousing more and more interest internationally, both in policies aiming at a more sustainable built environment (such as the European Directive PEB that will require, for example, all new buildings to be “nearly Zero-Energy” Buildings (nZEB) by 2020) and in the scientific literature. Although Zero-Energy can be considered at different scales, this approach only adopts the perspective of the individual building and neglects phenomena linked to larger scales. Therefore, this paper aims at investigating the “Zero-Energy Neighbourhood” concept. It proposes a calculation method that takes into account three main topics: the energy consumption of buildings, the impact of the location on the energy consumption for daily mobility and the use of renewable energies. An application of this calculation method to two representative case studies (one urban neighbourhood and one suburban neighbourhood) is proposed. Main parameters that act upon the energy balance are highlighted and combined to propose concrete results to improve our built environment and move towards more sustainability. Hourly and monthly balances, the potential of “energy mutualisation” and smart grids are keys challenges that are of crucial importance in the scope of a Zero-Energy objective at the neighbourhood scale. [less ▲]

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See detailAtypical myopathy: epidemiology and aetiopathogenesis
Votion, Dominique ULg

in In proceedings: 51th British Equine Veterinary Association (BEVA) Congress (2013, September)

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See detailImprovement of transport condition of swabs for group B streptococcal (GBS) screening
MELIN, Pierrette ULg; Dodémont, Magali; Sarlet, Gilles ULg et al

in Program and Abstract of the 53rd Intersciences Conference on Antimicrobial Agents and Chemotherapy. Washington, USA: ASM. (2013, September)

BACKGROUND For the screening-based strategy for prevention of perinatal GBS disease, CDC Guidelines as many others recommend use of appropriate transport media (Amies, Stuart, e.g.) and processing of ... [more ▼]

BACKGROUND For the screening-based strategy for prevention of perinatal GBS disease, CDC Guidelines as many others recommend use of appropriate transport media (Amies, Stuart, e.g.) and processing of specimen as soon as possible within 1 to 4 days. False negative cultures occur for several causes including lost of GBS viability during transport. Could Lim broth, recommended for the selective enrichment, and Granada tubes be used as transport media for swab? Simulating conditions of routine practice, Lim broth and Granada tubes, were evaluated in vitro as transport media. METHODS Tubes of 3 brands of Lim broth (Becton Dickinson, bioMérieux, Copan) and Granada tubes (bioMérieux) were inoculated with low inocula of 10-100 CFU of GBS. Each type of tubes was incubated at 4°C, room T° (RT) and 35°C. GBS were enumerated from each tube by subculture on blood agar after 1, 2, 3 and 4 days of storage at the different T°. All tests were processed in triplicates with 3 strains of GBS belonging to serotype Ia, III and V. RESULTS No difference of survival was observed between the 3 strains. T° had significant impact on GBS recovery for each type of tubes. At 4°C the viability was hardly sustained along the 4 days. At RT and 35°C, an increase >6 log of the inocula was observed. The increase of GBS density was sustained at least 4 days for the 3 brands of Lim broth. For the Granada broth, such increase was also observed but at day 3 for tubes incubated at 35°C, viability decreased and for some tubes, GBS subcultures were negative at day 3 or 4. CONCLUSION To improve sensitivity of GBS screening cultures, Lim broth could be recommended as a strong transport media and the advisable storage condition would be RT to 35°C up to 4 days. In this way, initiating selective enrichment culture at the time of collection of specimen would provide higher sensitivity even for low density of colonization. Transport at 4°C should be avoided in favour with RT to 35°C. Studies in clinical setting are expected. For Granada tubes, storage at RT was fine but improvement seemed restricted in time at 35°C as there was a loss of viability after 3 days. For Granada tubes, extended evaluation and delimitation of use are needed. [less ▲]

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See detailAchieving Informed Decision-Making using Building Performance Simulation
Attia, Shady ULg

in Proceeding of the Education and research in Computer Aided Architectural Design in Europe Conference (2013, September)

Building performance simulation (BPS) is the basis for informed decision-making of Net Zero Energy Buildings (NZEBs) design. This paper aims to investigate the use of building performance simulation tools ... [more ▼]

Building performance simulation (BPS) is the basis for informed decision-making of Net Zero Energy Buildings (NZEBs) design. This paper aims to investigate the use of building performance simulation tools as a method of informing the design decision of NZEBs. The aim of this study is to evaluate the effect of a simulation-based decision aid, ZEBO, on informed decision-making using sensitivity analysis. The objective is to assess the effect of ZEBO and other building performance simulation (BPS) tools on three specific outcomes: (i) knowledge and satisfaction when using simulation for NZEB design; (ii) users’ decision-making attitudes and patterns, and (iii) performance robustness based on an energy analysis. The paper utilizes three design case studies comprising a framework to test the use of BPS tools. The paper provides results that shed light on the effectiveness of sensitivity analysis as an approach for informing the design decisions of NZEBs. [less ▲]

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See detailHedges and woody strips browsing by cattle on pasture in Wallonia, Belgium
Vandermeulen, Sophie ULg; Pascal, Mathilde; Marche, Christian et al

in Michalk, David L.; Millar, Geoffrey D.; Badgery, Warwick B. (Eds.) et al Revitalising Grasslands to Sustain our Communities: Proceedings 22nd International Grassland Congress, Sydney 15-19 september 2013 (2013, September)

Agri-environmental measures promote woody hedges along meadows in Wallonia, raising the interest in tree and shrub as forage in intensive mixed dairy temperate production systems. This study aimed at (1 ... [more ▼]

Agri-environmental measures promote woody hedges along meadows in Wallonia, raising the interest in tree and shrub as forage in intensive mixed dairy temperate production systems. This study aimed at (1) determining the influence of an access to hedges on the grazing behavior of young cattle and (2) assessing the fermentation characteristics of woody species promoted in Wallonia. Twelve heifers, divided in two groups, were set to graze a ryegrass and white clover-based pasture in May 2012. The first group had access to a hedge composed of 12 temperate tree and shrub species, and the second group grazed the pasture only. The grazing and browsing behavior of the animals was recorded for 4 weeks along with pasture biomass availability, using the hand-plucking method. Samples of the 12 tree species were fermented using rumen fluid in an automated gas pressure monitoring system and gas production kinetics compared to ryegrass and white clover. Results suggest that the feeding behavior was influenced by the hedge. Grazing time of the control group was higher than heifers that could browse woody foliage (P<0.05). Browsing was especially noticeable when grass availability on pasture was lowest. In vitro ruminal fermentation kinetics differed among species (P<0.01) with Populus nigra and Fraxinus excelsior showing a potential of fermentation similar to herbaceous forages. It can be concluded that due to the browsing by cattle some woody species could be interesting as complementary feeding. Besides their attributes regarding the agricultural landscape, their feeding qualities should be considered when planting the hedges. [less ▲]

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See detailAnalyse de l’interaction entraîneur-sportifs. Analyse qualitative exploratoire d’un modèle original
Remy, Elodie ULg; Manfredini, Tiber ULg; Cloes, Marc ULg

in Carnel, Béatrice; Moniotte, Julien (Eds.) Intervention, Recherche et Formation: Quels enjeux, quelles transformations? (2013, September)

Notre démarche, novatrice, s’inscrit dans une orientation sociale de la psychologie du sport. Selon Brown (2006), la psychologie sociale correspond à la compréhension d’un comportement individuel dans un ... [more ▼]

Notre démarche, novatrice, s’inscrit dans une orientation sociale de la psychologie du sport. Selon Brown (2006), la psychologie sociale correspond à la compréhension d’un comportement individuel dans un contexte social. La psychologie du sport, elle, se définit comme « l’étude de l’effet des facteurs psychologiques et émotionnels sur les performances et de l’influence de la pratique sportive sur ces mêmes facteurs » (Cox, 2005, p. 14). Notre objectif consistait à déterminer le lien entre, d’une part, ce que les coaches définissent comme leur(s) priorité(s) d’actions, ce qu’ils font concrètement et comment le vivent les sportifs et, d’autre part, ce qu’attendent ces derniers. Il s’agissait également de déterminer comment le lien entre ces quatre aspects influe sur la performance et comment la performance agit en retour sur ces aspects. Afin de développer une méthodologie rigoureuse, nous avons élaboré un modèle qui a servi de cadre de référence pour la collecte de données au sein de trois équipes de basket-ball de 1ère régionale féminine wallonne (deuxième niveau hiérarchique belge). Dans chaque site, nous avons sollicité à la fois les joueuses et les entraîneurs (interviews, focus group, observations et questionnaires). Dans la première équipe, un net décalage est mis en évidence entre le projet du coach, celui des joueuses et les moyens dont dispose le club. Il se manifeste par des comportements contradictoires et ambivalents entre joueuses et entraîneur, ce qui semble impacter considérablement la performance. La seconde équipe s’inscrit dans un cadre particulier (école de formation ne pouvant connaître ni promotion ni relégation). La jeunesse des joueuses et le style de coaching vécu comme oppressant par les plus jeunes débouche sur un climat susceptible de limiter la performance. Enfin, la troisième équipe se situe largement en-dessous du niveau attendu. Les joueuses composent avec un entraîneur démissionnaire et un préparateur physique porté aux nues dont le comportement est décrit comme affectif et protecteur. Ce constat fait obstacle à une vision objective des acteurs sur les résultats. Ces résultats plaident en faveur du modèle proposé et pour un approfondissement de l’étude des liens entre dimensions organisationnelle, groupale et individuelle dans l’étude de la performance sportive collective. [less ▲]

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See detailEulerian Formulation for an Extensible Elastic Rod
Huynen, Alexandre ULg; Detournay, Emmanuel; Denoël, Vincent ULg

in Proceedings of the Fifth International Conference on Structural Engineering, Mechanics and Computation (2013, September)

This paper reformulates the governing equations of an extensible elastic rod by reference to a given spatial curve. This Eulerian formulation is motivated by the need to solve efficiently the constrained ... [more ▼]

This paper reformulates the governing equations of an extensible elastic rod by reference to a given spatial curve. This Eulerian formulation is motivated by the need to solve efficiently the constrained elastica problem encountered in many medical and engineering applications, in which a thin rod is inserted in a tortuous conduit. The Eulerian reformulation of the equations hinges on the restatement of the rod local equilibrium in terms of derivatives with respect to the curvilinear coordinate associated with the reference curve and the description of the rod deflection as a perturbation of this curve. The originality of the proposed formulation lays in the axially unconstrained character of the resulting system such that the determination of the rod configuration between two fixed points reduces to the resolution of a classical boundary value problem. [less ▲]

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See detailEVALUATION DES EMISSIONS DE METHANE IMPUTABLES AU SECTEUR AGRICOLE EN AFRIQUE DE L’OUEST (1961-2050)
Djaby, Bakary ULg; Ozer, Pierre ULg

in Boko, Michel; Vissin, Expédit W.; Afouda, Fulgence (Eds.) CLIMAT, AGRICULTURE & RESSOURCES EN EAU d'hier à demain (2013, September)

The objective of this study is to review the evolution of methane (CH4) emissions related to agriculture in West Africa over the last fifty years (1961-2010). The main agricultural sources of CH4 are ... [more ▼]

The objective of this study is to review the evolution of methane (CH4) emissions related to agriculture in West Africa over the last fifty years (1961-2010). The main agricultural sources of CH4 are ruminants (enteric fermentation) and rice production (anaerobic decomposition). To do this, we used the FAO statistics for both rice production and livestock. It appears that CH4 emissions are regionally rising although presenting large differences between the Sahelian countries and those of the Gulf of Guinea. Indeed, the countries bordering the Sahara seem to take profit of improving rainfall over the past two decades to increase livestock. On the contrary, wetter countries increase rice development. A close relationship is found between the human population and CH4 emissions from the agricultural sector. Yet, human population increase projected by 2050 is questionable, particularly in relation to the margin of CH4 emissions increase in West Africa. [less ▲]

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See detailA fundamental study of the inception of motion of coarse sediments
Duma, Diana ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Proceedings of 2013 IAHR World Congress (2013, September)

This research aims to provide new knowledge about the inception of motion in rivers with coarse sediments and, possibly, macro-roughness flow regime, for which, so far, civil and environmental engineers ... [more ▼]

This research aims to provide new knowledge about the inception of motion in rivers with coarse sediments and, possibly, macro-roughness flow regime, for which, so far, civil and environmental engineers face much uncertainty in the determination of threshold hydraulic conditions for sediment transport. The threshold conditions have to be clearly defined, at the theoretical level, and well identified, in experimental tests. Therefore, a specific program of laboratory experiments has been designed. It relies on two complementary laboratory flumes of, respectively, 6m and 20m in length (discharge up to 100 l/s, slope between 0 and 4%). Three different thresholds have been defined to distinguish between the following four states: no motion, vibration of stone, local motion, and large scale motion. Based on experimental tests conducted so far in the smaller flume, velocity profile and turbulence intensity measured in quasi-uniform and non-uniform flow conditions have been correlated with the inception of motion. Flow velocity was measured using UVP transducers. In this paper, the results of a first phase of the study are presented, with the aim of validating the experimental setup, procedure and instrumentation. They focus particularly on the feasibility of collecting the relevant flow variables (shear velocity, turbulence) from a limited number of pointwise velocity measurements. [less ▲]

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See detailEVOLUTION RECENTE DES EXTREMES PLUVIOMETRIQUES ET DES TEMPERATURES A DJIBOUTI
Mahamoud, Ayan; Laminou Manzo, Ousmane; Ozer, Pierre ULg

in Boko, Michel; Vissin, Expédit W.; Afouda, Fulgence (Eds.) CLIMAT, AGRICULTURE & RESSOURCES EN EAU d'hier à demain (2013, September)

A dataset of 19 derived indicators has been compiled to clarify whether the frequency and / or the severity of rainfall and temperature extremes changed over the last decades in the city of Djibouti in ... [more ▼]

A dataset of 19 derived indicators has been compiled to clarify whether the frequency and / or the severity of rainfall and temperature extremes changed over the last decades in the city of Djibouti in East Africa. This study uses the only current available coverage of homogenous daily series which can be used for calculating any significant change in rainfall and temperature in recent years. It covers the 1980–2011 period for precipitation and the 1966–2011 period for what regards maximum, minimum and mean temperature. Results show that the annual total precipitation, the annual total of wet days and the frequency of intense rainfall have strongly declined over the last 32 years. Yet, since 2007, mean yearly rainfall meets a 73% deficit when compared to the 30-year average, a situation that is much worse than what was observed in the early 1980s. For what regards temperatures, the average increase recorded during the 1966–2011 period is of +0.28°C per decade, a far higher value than the global rising temperature. Heatwaves characterized by daily maximum temperatures ≥45°C (that is the 99th percentile) have become 15 times more frequent than in the past (comparing the 1966–75 and 2002–2011 periods) while extremely cool nights (<18.7°C, that is the 1st percentile in minimum temperature) have almost disappeared. Although the database should be extended to improve the global picture of recent climate changes in Djibouti, it seems very likely that rainfall shortages and increasing temperature extremes have already impacted the people of the Republic of Djibouti, especially the water availability and health sectors. [less ▲]

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See detailVibrations of cables with bending stiffness by an asymptotic approach
Canor, Thomas ULg; Denoël, Vincent ULg

in Zingoni, Alphose (Ed.) Fifth International Conference on Structural Engineering, Mechanics & Computation, Cape Town, 1-4 September 2013 (2013, September)

Vibrations of cables with a small bending stiffness concerns many engineering applications such as the fatigue assessment of stay cables. With the finite element (FE) method, the analysis can be performed ... [more ▼]

Vibrations of cables with a small bending stiffness concerns many engineering applications such as the fatigue assessment of stay cables. With the finite element (FE) method, the analysis can be performed with nonlinear truss elements, but bending effects are not taken into account. Otherwise, beam elements can be used, but the smallness of the bending stiffness may lead to numerical instability and mediocre results in boundary regions. In this context, the paper presents an alternative method to calculate the time evolution of the profile of bending moments in boundary layers of cables, avoiding heavy FE analysis. The developments combine the theory of vibrations of extensible rods with asymptotic methods. The equations are decoupled between the slow dynamics of the boundary regions and the fast dynamics of the span. Then, a composite solution is constructed by means of a matched asymptotic procedure. [less ▲]

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See detailThe challenge of understanding myopathies in horses using permeabilized muscle cells
Votion, Dominique ULg; Mouithys-Mickalad, Ange ULg; Ceusters, Justine ULg et al

in In proceedings 9th Conference on Mitochondrial Physiology (2013, September)

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See detailDecorating a Domus during the Second Triumvirate. Iconographical Program of the Dwarfs’ Oecus at Ostia Antica.
Machowski, Mélanie ULg; Morard, Thomas ULg

in Context and Meaning. Actes du XII Colloque international de l'AIPMA (Athènes, 16-20 septembre 2013) (2013, September)

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See detailProfils de discordance et comportement d’élèves dans un contexte d’éducation physique belge francophone
Martel, Denis; Cloes, Marc ULg; Colina-Valdor, Xavier et al

in Carnel, Béatrice; Moniotte, Julien (Eds.) Intervention, Recherche et Formation: Quels enjeux, quelles transformations? (2013, September)

Les profils de discordance sont déterminés à partir des écarts entre l’auto-évaluation des élèves (AÉ) et leur prédiction de l’évaluation de l’éducateur physique à leur égard (PrÉ) concernant leur niveau ... [more ▼]

Les profils de discordance sont déterminés à partir des écarts entre l’auto-évaluation des élèves (AÉ) et leur prédiction de l’évaluation de l’éducateur physique à leur égard (PrÉ) concernant leur niveau de performance, leur coopération et l’intensité de leurs efforts en classe d’éducation physique et sportive (ÉPS) (Martel et al., 2011). Une étude québécoise a permis d’établir que plus les élèves s’estiment sous-évalués par leur enseignant sur ces trois dimensions, moins ils tendent à rapporter l’adoption de comportements positifs durant les cours d’ÉPS. Pour la présente étude, réalisée dans un contexte belge francophone, les objectifs étaient : (1) de déterminer les profils de discordance d’élèves (PDi), et (2) d’analyser la relation entre ces PDi et les comportements que disent adopter les élèves en ÉPS. Un total de 1271 élèves (722 filles, 549 garçons) âgés entre 11 et 20 ans, provenant des niveaux secondaires inférieur (n=857) et supérieur (n=414) d’écoles (N=4) de l’agglomération de Liège, ont volontairement participé à l’étude. Un questionnaire validé, adapté d’une version québécoise, a été complété par les élèves vers la fin de l’année scolaire en l’absence de l'éducateur physique. Les résultats, inférieurs à ceux d’autres études, révèlent que 25% des élèves expriment un profil de concordance parfaite entre leur AÉ et leur PrÉ, c’est-à-dire s’estiment évalués à leur juste valeur à la fois pour leur niveau de performance, leur coopération et leurs efforts en ÉPS. Par ailleurs, 56% des élèves s’estiment sous-évalués (discordance négative) sur une seule dimension (27,7%), deux dimensions (19,4%) ou trois dimensions (9,5%) simultanément. Enfin, les résultats confirment ceux de Martel et al. (2011), à savoir que plus les élèves se sentent sous-évalués, particulièrement ceux qui se sentent sous-évalués sur au moins deux dimensions, moins ils rapportent de comportements positifs (p< .001) que ceux qui perçoivent être davantage en accord avec leur enseignant. [less ▲]

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See detailReliability of ERT-derived Temperature - Insights from Laboratory Measurements
Robert, Tanguy ULg; Hermans, Thomas ULg; Dumont, Gaël ULg et al

in EarthDoc - Near Surface Geosciences 2013 - 19th European Meeting of Environmental and Engineering Geophysics (2013, September)

We performed laboratory measurements on fully saturated sand samples in the context of deriving reliable temperature from time-lapse electrical resistivity tomography (ERT). The experiment consisted in ... [more ▼]

We performed laboratory measurements on fully saturated sand samples in the context of deriving reliable temperature from time-lapse electrical resistivity tomography (ERT). The experiment consisted in monitoring an increase of temperature in sand samples with electrical resistivity measurements. We neglected the effect of surface conductivity since experiments showed two orders of magnitude between surface and fluid conductivities. We show that using simple linear relationship between fluid electrical conductivity and temperature alone does not allow reliable temperature estimates. Indeed, chemical analyses highlight the importance of accounting chemical reactions occurring when temperature changes, including dissolution/precipitation processes. We performed two experiments based on typical in-situ conditions. We first simulated the injection of a less conductive tap water and second, the injection of heated formation water. In the second case, minerals solubility decreases and precipitation occurs, leading to an increase of bulk resistivity. This mechanism competes with dissolution of minerals when tap water is injected, since tap water is not in equilibrium with the medium. In any case, further research is needed to fully understand the mechanisms and to develop a fully integrated law to derive better temperature estimates. [less ▲]

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See detailEarly decision support for net zero energy buildings design using building performance simulation
Attia, Shady ULg; Gratia, Elisabeth; De Herde, Andre et al

in Clean Technology for Smart Cities and Buildings (2013, September)

This paper aims to investigate the use of building performance simulation tools as a method of informing the design decision of NZEBs. The aim of this study is to evaluate the effect of a simulation-based ... [more ▼]

This paper aims to investigate the use of building performance simulation tools as a method of informing the design decision of NZEBs. The aim of this study is to evaluate the effect of a simulation-based decision aid, ZEBO, on informed decision-making using sensitivity analysis. The objective is to assess the effect of ZEBO and other BPS tools on three specific outcomes: (i) knowledge and satisfaction when using simulation for NZEB design; (ii) users’ decision-making attitudes and patterns, and (iii) performance robustness based on an energy analysis. The paper utilizes three design case studies comprising a framework to test the use of BPS tools. Two types of data were collected, mainly preference and performance data. The preference data were used to collect information from participants using self-reported metrics. The performance data were used to collect information on the energy performance of the final design. The energy evaluations were compared with the results of a quantitative assessment of the overall design performance. Finally the results were compared and presented. The paper provides results that shed light on the effectiveness of sensitivity analysis as an approach for informing the design decisions of NZEBs. [less ▲]

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See detailÉVOLUTION CLIMATIQUE, PERCEPTION ET ADAPTATION DES COMMUNAUTES RURALES DU PLATEAU D’ABOMEY (BENIN)
Ozer, Pierre ULg; Hountondji, Yvon-Carmen; Ahomadegbe, Mathias et al

in Boko, Michel; Vissin, Expédit W.; Afouda, Fulgence (Eds.) CLIMAT, AGRICULTURE & RESSOURCES EN EAU d'hier à demain (2013, September)

West Africa is extremely vulnerable to climate change. This paper first analyses recent trends in extreme rainfall and temperatures recorded at six synoptic stations in Benin. Results show that rainfall ... [more ▼]

West Africa is extremely vulnerable to climate change. This paper first analyses recent trends in extreme rainfall and temperatures recorded at six synoptic stations in Benin. Results show that rainfall is declining while temperatures are increasing significantly. Cold nights (1st TMin percentile) are decreasing very significantly while hot days (99th TMax percentile) are increasing very significantly. No trend is observed in the frequency of extreme rainfall events. Then, rural populations of the plateau of Abomey were interviewed about their perception of climatic risks. They highlighted that major risks are spatiotemporal rain variability and rainfall shortage / excess (drought / flood), strong winds, and excessive temperature. Confronted with these hazards, local farmers are developing on their own endogenous strategies, which are mostly not rational and far from solving climatic hazards in a sustainable way. More detailed studies are needed in order to identify together with these communities pragmatic and sustainable adaptive options. [less ▲]

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See detailDynamics of Elasto-Inertial Turbulence in Flows with Polymer Additives
Terrapon, Vincent ULg; Dubief, Yves; Soria, Julio

in Proceedings of the 8th International Symposium on Turbulence and Shear Flow Phenomena (TSFP-8) (2013, August 30)

The dynamics of elasto-inertial turbulence is investigated numerically from the perspective of the coupling between polymer dynamics and flow structures. In particular, direct numerical simulations of ... [more ▼]

The dynamics of elasto-inertial turbulence is investigated numerically from the perspective of the coupling between polymer dynamics and flow structures. In particular, direct numerical simulations of channel flow with Reynolds numbers ranging from 1000 to 6000 are used to study the formation and dynamics of elastic instabilities and their effects on the flow. Based on the splitting of the pressure into inertial and polymeric contributions, it is shown that the trains of cylindrical structures around sheets of high polymer extension that are characteristics to elasto-inertial turbulence are mostly driven by polymeric contributions. [less ▲]

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See detailEntreprises et développement durable: vers une nouvelle forme de responsabilité sociale?
Goemans, Adeline; Robert, Jocelyne ULg

in C. Dupont; R. Giuliano; J.M. Peretti (Eds.) "De l'audit social à l'audit de la responsabilité sociale: la RSE, renouveau pour la GRH" Proceeding colloque IAS (2013, August 30)

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See detailA mucin-enriched fermentation model to assess prebiotic potential of new indigestible carbohydrates
Boudry, Christelle ULg; Tran, Thi Hanh Tham ULg; Blaise, Yannick ULg et al

in 64th Annual Meeting of the European Federation of Animal Science (2013, August 29)

Screening the prebiotic potential of novel indigestible carbohydrates (ICH) is a challenge for feed and food industry and in vitro models are increasingly used for such purposes. Recently extracellular ... [more ▼]

Screening the prebiotic potential of novel indigestible carbohydrates (ICH) is a challenge for feed and food industry and in vitro models are increasingly used for such purposes. Recently extracellular binding proteins responsible for the adherence to intestinal mucus were described for several Lactobacillus species. As this genus is known for its beneficial effect on gut health, we enriched the in vitro gas fermentation model with mucin in order to evaluate the prebiotic potential of 5 ICH. Mucin-coated microcosms (MCM) were prepared as described by Van den Abbeele et al. (2012, Microbial Biotechnology, 5, 106-115) and introduced in the fermentation bottles with an inoculum prepared from fresh faeces of 3 sows mixed with a nutritive buffer solution. Fermentation was performed at 39°C, using 200 mg of substrate, 30 ml of inoculum and 6 MCM, yielding approx. 20 mg mucin each, in 140 ml glass bottles. A first study was performed with inulin and cellulose as substrates, with and without mucus in the bottles. A second study was performed with 5 substrates (inulin, IMO, beet pulp POS, cellobiose and gluconate) in presence of mucus. After 8 and 72h, SCFA and the microflora of fermentation broth was analysed as well as the microflora on the MCM. The comparison of the microflora evolution with and without mucus showed a better development of the Lactobacillus in the fermentation broth, mainly in presence of inulin. The development of the Lactobacillus genus allowed the classification of the 5 substrates tested in the second study (Inulin > IMO > Gluconate > Cellobiose > POS)(P < 0.05) which was not possible without mucus (P > 0.05). Inulin and IMO showed also the highest development of Bifidobacteria (P < 0.05) and the highest levels of butyrate production (P < 0.05) compared to the three other substrates, indicating a high prebiotic potential. [less ▲]

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See detailField Investigation of subacute ruminal acidosis in Walloon dairy herds
Lessire, Françoise ULg; Knapp, Emilie ULg; Theron, Léonard ULg et al

in Universität Bern (Ed.) Proceedings of 8th ECBHM (2013, August 28)

Subacute ruminal acidosis (SARA) has been considered as a major metabolic disease in high producing dairy herds for years. For instance, out of 737 cows from Wisconsin farms, 20% exhibited ruminal pH ... [more ▼]

Subacute ruminal acidosis (SARA) has been considered as a major metabolic disease in high producing dairy herds for years. For instance, out of 737 cows from Wisconsin farms, 20% exhibited ruminal pH values lower than 5.5, allowing diagnosis of SARA, while 23% of animals were considered at risk with ruminal pH values between 5.5 and 5.8. These findings were corroborated by further studies in Europe. However, different feeding practices and herd’s production levels are found in Wallonia, requiring evaluation of SARA prevalence in local herds. [less ▲]

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See detailIs the wheat distillers grains soluble ProtiWanze® a valuable alternative to soybean and canola meals in beef cattle?
Lessire, Françoise ULg; Rollin, Frédéric ULg

in Université de Berne (Ed.) Proceedings of 8th ECBHM (2013, August 28)

The objective of this study was to evaluate whether introducing the condensed distillers soluble (CDS) ProtiWanze® (PW) in beef cattle diets has an impact on feeding costs, health and production of the ... [more ▼]

The objective of this study was to evaluate whether introducing the condensed distillers soluble (CDS) ProtiWanze® (PW) in beef cattle diets has an impact on feeding costs, health and production of the animals. PW, a by-product derived from a Belgian bio-ethanol plant which utilizes only branless wheat, is an acid (pH=4) liquid feed rich in energy (VEM= 1130) and protein (TP= 282 mg/kg DM). PW supplementation from 9 to 13% on DM basis was tested in 4 suckler cattle farms for 4 months in 2011 and 2012: In 2011, 2 Belgian Blue (BB) (H1 and H3) and one Blonde d’Aquitaine (H2) herds were evaluated and in 2012, H2 was replaced by a third BB herd (H4). Every month, the animals’ health and production were checked by means of Body Condition Scoring (BCS), Ruminal Fill (RF), Fecal Consistency (FC), Undigested Fraction (UF) and Locomotion Scores (LS). Ruminal fluid was collected with a stomach tube (Ruminator®) on 5 cows for pH, redox potential (Methylene blue test) and protozoa assessment (optical microscopy). Reproduction performances during these 2 years were analyzed. The price of a diet containing the same amount of proteins brought by a mixture of 1/3 soybean and 2/3 canola meal was calculated to verify whether introducing PW reduced feeding costs. [less ▲]

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See detailDetection of antibodies against Schmallenberg virus in wild boars, Belgium, 2010-2012
Desmecht, Daniel ULg; Garigliany, Mutien-Marie ULg; Beer, Martin et al

in Lecoq, Yves (Ed.) 31th Congress of the International Union of Game Biologists (2013, August 27)

In the summer/fall of 2011, a nonspecific febrile syndrome characterized by hyperthermia and drop in milk production with occasional reports of watery diarrhea and abortion was reported among dairy cows ... [more ▼]

In the summer/fall of 2011, a nonspecific febrile syndrome characterized by hyperthermia and drop in milk production with occasional reports of watery diarrhea and abortion was reported among dairy cows on farms in northwestern Europe. Further, in November 2011, an enzootic outbreak of malformed neonates emerged in several European countries, with stillbirth and birth at term of lambs, kids and calves with neurological signs or malformations of the head, spine, or limbs. Both syndromes were associated with the presence in the blood (adults) or in the central nervous system (newborns) of a new Shamonda/Sathuperi-like orthobunyavirus, provisionally named Schmallenberg virus (SBV) after the town in Germany where the first positive clinical samples were identified. Defining as precisely as possible the host range of the newcomer is a key point to predict the outcome of the emergence of SBV disease in Europe. In this respect, it must be pointed out that orthobunyaviruses infect more animal species than those in which the foetus is damaged. Recently, serological evidence for SBV infection in wild ruminant species (Cervus elaphus and Capreolus capreolus) was reported (Linden et al., 2012). In the present study, the objective was to seek after serological evidence of SBV infection among wild boars living in a geographical area where exposure to infected insect vectors was high in 2011, as judged from the very high seroprevalence reported among cattle in that region. About 700 animals were sampled during the 2010-2012 hunting seasons. All serum samples collected during the fall of 2010 were seronegative. On the contrary, apparent seroprevalence among wild boars in 2011 was ~27% and started to decline in 2012 (~11%). Acquired immunity against the new virus was thus already very high in the wild boar populations sampled in the fall 2011, suggesting that the new virus had quickly spread throughout the region since its emergence about 250 km northeast in the late summer 2011. The drop in seroprevalence recorded in 2012 suggests that the virus was no more circulating in the region. [less ▲]

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See detailSchmallenberg virus circulation among red and roe deer populations in Belgium
Garigliany, Mutien-Marie ULg; Volpe, Rosario ULg; Paternostre, Julien ULg et al

in 31th Congress of the International Union of Game Biologists, Abstract Book (2013, August 27)

Schmallenberg virus (SBV) is a recently discovered vector-borne Orthobunyavirus targeting ruminants. It is transmitted by Culicoides biting midges and caused a large outbreak in European sheep and cattle ... [more ▼]

Schmallenberg virus (SBV) is a recently discovered vector-borne Orthobunyavirus targeting ruminants. It is transmitted by Culicoides biting midges and caused a large outbreak in European sheep and cattle populations in 2011 and 2012. The infection of adults was associated with a drop in milk production, fever and diarrhea. But the virus was further shown to cross the placental barrier and to be responsible for a hydrocephaly/arthrogryposis syndrome in calves and lambs. After its occurrence in 2011 in Germany, SBV quickly spread across Europe and in spring 2012 more than 90% of Belgian domestic cattle had seroconverted. To assess the susceptibility of wild ruminants to the infection, a total number of 547 and 494 sera, from red (Cervus elaphus) and roe deer (Capreolus capreolus), respectively, were collected during the hunting seasons 2010 to 2012 and tested for the presence of anti-SBV antibodies. While no samples from 2010 revealed to be positive, about two-thirds of red deer and half of roe deer sampled in 2011 were seropositive. In 2012, the seroprevalence dropped to 33% in red deer and remained stable in roe deer. The high seroprevalence rates found in both species in Belgium shows that wild ruminants are susceptible to the infection by SBV. If the infection of deer was associated to a hydrocephaly/arthrogryposis syndrome similar to that observed in domestic ruminants is still unknown. There is currently no evidence of such a transplacental passage in red or roe deer. The decrease in the seroprevalence observed in red deer in 2012 might be the result of the turn-over in the red deer population and reflect an absence of virus circulation in 2012. Further investigations in the upcoming years will help to enlighten this point. [less ▲]

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See detailAssessment of the selenium status in cattle herds in Wallonia
Mehdi, Youcef ULg; Dotreppe, Olivier ULg; Robaye, Vincent ULg et al

in 64th Annual Meeting of the European Federation of Animal Science (2013, August 26)

The selenium content is low in the soil of Wallonia, the southern part of Belgium. It is therefore logical that the selenium content in feedstuffs grown in these fields-grass, conserved forages, cereals ... [more ▼]

The selenium content is low in the soil of Wallonia, the southern part of Belgium. It is therefore logical that the selenium content in feedstuffs grown in these fields-grass, conserved forages, cereals and by-products- is also low. A survey was carried on 166 farms in Wallonia. The farms were located in 4 specific agronomy areas- Pays de Herve with mainly pastures (4farms)- Ardennes (a sub-mountainous area and pastures, 24 farms), Hesbays with mainly arable lands (55 farms) and Condroz with both pastures and arable (83 farms) There were herds with dairy cow, herds with beef cow and herds with both types of animals. The average age was 44±15 months for the cows and 18±6 months for the heifers. The blood samples were taken on five healthy animals of each herd, on the end of the winter just before the animals went to pastures. The selenium status was assessed by the activity of the Glutathion peroydase. The selenium status was extremely variable for the different farms of the 4 areas with variation coefficient of 56%. It was in Pays de Herve and in Hesbaye that the average selenium status was the highest at 53 and 56 µg Se/l. By contrast, it was in Ardenne and in Condroz that the status was the lowest, at 39 and 43 µg Se/l. The selenium status was, on the whole, higher in the dairy herds than in the beef herds owing to the higher selenium provision by the mineral mixtures and the compound feedstuffs added to the diet. Assuming that the normal selenium concentration in plasma being 70µg/l, it appeared also that 81% of the individual animals tested were below the normal Se concentration. It can thus be concluded from the present survey that the cattle herds in Wallonia are deficient in selenium. [less ▲]

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See detailThe potential of MIR spectra to certify milk geographic origin
Dale, Laura-Monica ULg; Laine, Aurélie ULg; Goubau, Amaury et al

in 64rd Annual Meeting of the European Federation of Animal Science (2013, August 26)

Protecting and supporting local production systems, regional authorities, as well as producers, give a very important role to milk quality. Therefore, this study was aimed to investigate the potential of ... [more ▼]

Protecting and supporting local production systems, regional authorities, as well as producers, give a very important role to milk quality. Therefore, this study was aimed to investigate the potential of mid-infrared spectroscopy (MIR) for certifying the geographic origin of milk. Because milk MIR spectral databases and extra phenotypes (breed, testday, livestock herd and origin appellation of traditional products) were available in the Belgium Walloon Region via European project OptiMIR (INTERREG IVB North West Europe Program), discrimination studies were conducted to distinguish Ardennes region (which is linked to PDO “Beurre d’Ardennes”) from the rest of Wallonia. A total of 542,733 spectral records linked to their geographic origin coming from Wallonia milk recording were used (97,369 of MIR spectra -Ardennes region and 450,326 -rest of Wallonia). A mixed model (fixed: breed, year and month of record, random: herd x year) was applied to obtain predicted MIR spectral values for all testdays and prediction errors (residuals) representing the factors not present in the model. In order to test the MIR ability to milk authentication, chemometric tools, such as partial least squat regression and linear discriminant analysis were applied to residuals for three MIR spectral regions (e.g. 930-1600 cm-1, 1710-1810 cm-1 and 2560-2990 cm-1). The classifications on not-corrected MIR spectral data were 95% and the cross-validation were 95% for Ardennes region. Results showed after correction of MIR spectra, the discriminant function constructed on the residuals spectra allowed a good discrimination. The results show that MIR spectroscopy techniques may provide useful fingerprints to detect geographic origin and could be potentially used in routine management decision and quality assurance tools. [less ▲]

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See detailMacro-Kinematic Modelling of Continuous Deep Beams
Mihaylov, Boyan ULg

in Actes de la 14e édition des Journées Scientifiques, 22 et 23 août 2013, Université de Sherbrooke, Québec (2013, August 23)

Cet article présente une approche macro-cinématique permettant de décrire les schémas de déformation avec fissures diagonales des poutres-voile continues. On montre comment une poutre continue formée de ... [more ▼]

Cet article présente une approche macro-cinématique permettant de décrire les schémas de déformation avec fissures diagonales des poutres-voile continues. On montre comment une poutre continue formée de deux travées symétriques et supportant deux charges concentrées égales peut être modélisée à partir de seulement deux degrés de liberté. Ce modèle cinématique est combiné avec une théorie cinématique à trois paramètres (3PKT) qui permet de calculer la résistance au cisaillement de poutres-voile, les réactions d’appuis à la ruine et la capacité de déformation de poutres-voile continues. Cette approche a été appliquée à quatorze essais de cisaillement issus de la littérature avec différentes hauteurs de section, différents arrangement de l’armaturage longitudinal et différentes quantités d’armaturage de cisaillement. Les résultats montrent que cette approche macro-cinématique basée sur deux degrés de liberté reproduit correctement les tendances observées dans la capacité ultime au cisaillement des spécimens. [less ▲]

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See detailOn a modified bilinear law to model bit/rock interaction in percussive drilling
Depouhon, Alexandre ULg; Denoël, Vincent ULg; Detournay, Emmanuel

in Proceedings of the Nonlinear Dynamics in Engineering Conference (2013, August 21)

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

in Proceedings of the Astrodynamics Specialist Conference (2013, August 12)

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

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

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See detailDeformations in deep continuous reinforced concrete transfer girders
Mihaylov, Boyan ULg; Hunt, Bradley; Bentz, Evan et al

in Concrete Structures in Urban Areas, CCC 2013, Wroclaw, Poland 4-6 September 2013 (2013, August 05)

This paper presents a three-parameter kinematic model for the deformation patterns of deep continuous transfer girders. The three degrees of freedom of the model are the average strains along the top and ... [more ▼]

This paper presents a three-parameter kinematic model for the deformation patterns of deep continuous transfer girders. The three degrees of freedom of the model are the average strains along the top and bottom longitudinal reinforcements within each shear span, as well as the transverse displacement in the critical loading zone. The model is validated with the help of a large test of a two-span continuous beam performed at the University of Toronto. It is shown that the apparently complex deformation patterns of the specimen are captured well by the kinematic model. [less ▲]

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See detailComparison between optical pulsed thermography and vibrothermography for the assessment of carbon fibers composite materials
Montrieux, Henri-Michel ULg; Demy, Philippe; Ibarra-Castanedo, Clemente et al

(2013, August 02)

Pulsed thermography and vibrothermography are two active thermography techniques characterized by different heating methods of the specimen. In pulsed phase thermography, a sample is heated by two flash ... [more ▼]

Pulsed thermography and vibrothermography are two active thermography techniques characterized by different heating methods of the specimen. In pulsed phase thermography, a sample is heated by two flash lamps for a short period to inject a Dirac impulse heat in the material. The cooling of the part is monitored with an infrared camera to detect thermal contrast in the image, characteristic of the presence of a defect. In vibrothermography, high frequency vibrations are injected into the sample causing an internal heating observed on surface right above the defect due to diverse phenomena as friction or viscoelastic hysteresis. If pulsed thermography is a well-known technique that has been integrated into the arsenal of industrial NDT methods, vibrothermography is a less common experimental method still subject to theoretical and practical investigations. This article aims to compare the effectiveness of the two methods in the case of different types of composites based on carbon fibers: carbon fiber reinforced plastic (CFRP) plates as well as a completely new material: carbon magnesium composite. [less ▲]

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See detailMid-infrared prediction of cheese yield from milk and its genetic variability in first-parity cows
Colinet, Frédéric ULg; Troch, Thibault ULg; Vanden Bossche, Sandrine et al

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

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See detailGenetics of mastitis in the Walloon Region of Belgium
Bastin, Catherine ULg; Vandenplas, Jérémie ULg; Laine, Aurélie ULg et al

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

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See detailUse of visible-near infrared spectroscopy to determine cheese properties
Troch, Thibault ULg; Vanden Bossche, Sandrine; De Bisschop, Céline et al

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

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See detailNutritive value of four tropical forage legume hays fed to pigs in the Democratic Republic of Congo
Kambashi Mutiaka, Bienvenu ULg; Boudry, Christelle ULg; Picron, Pascale ULg et al

in 64th Annual Meeting of the European Federation of Animal Science (2013, August)

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See detailNon-industrial seeds as a civic entry point to sustainable food systems
Hecquet, Corentin ULg

in XXV Congres ESRS (2013, August)

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See detailHerd-test-day variability of methane emissions predicted from milk MIR spectra in Holstein cows
Vanrobays, Marie-Laure ULg; Kandel, Purna Bhadra ULg; Soyeurt, Hélène ULg et al

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

The aim of this study was to estimate the herd-test-day (HTD) effect on milk yield, fat and protein content, and methane (CH4) emissions of Walloon Holstein first-parity cows. A total of 412,520 test-day ... [more ▼]

The aim of this study was to estimate the herd-test-day (HTD) effect on milk yield, fat and protein content, and methane (CH4) emissions of Walloon Holstein first-parity cows. A total of 412,520 test-day records and milk mid-infrared (MIR) spectra of 69,223 cows in 1,104 herds were included in the data set. The prediction equation developed by Vanlierde et al. (Abstract submitted to EAAP 2013; R² of cross-validation=0.70) was applied on the recorded spectral data to predict CH4 emissions (g/d). Daily CH4 emissions expressed in g/kg of milk were computed by dividing CH4 emissions (g/d) by daily milk yield of cows. Several bivariate (a CH4 trait with a production trait) random regression test-day models including HTD and classes of days in milk and age at calving as fixed effects and permanent environment and genetic as random effects were used. HTD solutions of studied traits obtained from these models were studied and presented large deviations (CV=17.54%, 8.93%, 4.68%, 15.51%, and 23.18% for milk yield, fat and protein content, MIR CH4 (g/d), and MIR CH4 (g/kg of milk), respectively) indicating differences among herds, especially for milk yield and CH4 traits. HTD means per month of milk yield and fat and protein contents presented similar patterns within year. The maximum of monthly HTD means corresponded to the spring (pastern release) for milk yield and to the winter for fat and protein contents. The minimum corresponded to the month of November for milk yield and to the summer for the other traits. For MIR CH4 (g/d), monthly HTD means showed similar patterns as fat and protein content within year. MIR CH4 (g/kg of milk) presented maximum values of monthly HTD means in November and minimum values in May. Finally, results of this study showed that HTD effects on milk production traits and on MIR CH4 emissions varied through herds and seasons. [less ▲]

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See detailExperimental identification of the complex dynamics of a strongly nonlinear spacecraft structure
Noël, Jean-Philippe ULg; Renson, Ludovic ULg; Kerschen, Gaëtan ULg

in Proceedings of the ASME IDETC/CIE 2013 (2013, August)

The present paper addresses the identification of a real-life spacecraft structure possessing an impact-type nonlinear component. The complete identification procedure, i.e. from nonlinearity detection to ... [more ▼]

The present paper addresses the identification of a real-life spacecraft structure possessing an impact-type nonlinear component. The complete identification procedure, i.e. from nonlinearity detection to parameter estimation, is carried out using experimental data collected during a typical spacecraft qualification test campaign. The complementary use of several techniques reveals particularly interesting and complex phenomena such as nonlinear jumps, nonlinear modal interactions, internal force relaxation and chattering during impacts. [less ▲]

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See detailDevelopment of a genomic evaluation for milk production for a local bovine breed
Colinet, Frédéric ULg; Vandenplas, Jérémie ULg; Faux, Pierre ULg et al

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

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See detailTourisme, privatisation des littoraux et érosion des côtes: cas de Phan Thiet, Vietnam
Ozer, Pierre ULg

in 8th International conference (IAG) on Geomorphology: « Geomorphology and sustainability », Paris, 27-31 August 2013 (2013, August)

Avec ses plus de 3200 km de côtes, le Vietnam fait partie des pays les plus exposés aux effets du réchauffement climatique : élévation du niveau des mers, augmentation de la fréquence des typhons et des ... [more ▼]

Avec ses plus de 3200 km de côtes, le Vietnam fait partie des pays les plus exposés aux effets du réchauffement climatique : élévation du niveau des mers, augmentation de la fréquence des typhons et des inondations. Début 2009, 27 maisons situées dans le village de pêcheurs de Phan Thiet se sont effondrées. Selon les médias internationaux et les autorités locales, une forte marée de tempête –conséquence du réchauffement climatique– était la cause de cette rapide érosion littorale. Cet article montre comment, en utilisant la fonction multi dates Google Earth, il est possible de nier cette argumentation et de mettre en évidence les vraies causes de ce rapide et inéluctable retrait des côtes au niveau de ce village de pêcheurs, à savoir la construction anarchique de la station balnéaire de Mui Ne, quelques kilomètres à l’est. La création de ce désormais haut lieu touristique est extrêmement récente, le premier établissement étant sorti de terre en 1994. Vu le succès croissant des plages de sable blanc, la côte a depuis été lotie sur près de 5 km. Mui Ne a modifié son espace pour accueillir les touristes occidentaux : les cocoteraies ont été abattues, les liserons des sables ont été arrachés, le sable a été égalisé et les infrastructures hôtelières ont recouvert les dunes pour être en contact direct avec la plage. Ainsi, le fragile équilibre littoral a été rompu et le bilan sédimentaire est devenu négatif. Entre 2006 et 2009, la plage de 30 m a totalement disparu. Or, la plage étant vitale pour ce lieu, les promoteurs ont eu recours à la construction d’épis qui interrompent le transit sédimentaire pour recréer les plages. La dérive littorale est ainsi stoppée ce qui engendre la disparition des plages suivantes et l’effondrement des maisons de pêcheurs. Cette analyse montre la rapide modification géomorphologique qui résulte d’une conversion économique locale non encadrée répondant aux processus de mondialisation sans tenir compte des externalités négatives. [less ▲]

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See detailContact model between superelements in dynamic multibody systems
Virlez, Geoffrey ULg; Bruls, Olivier ULg; Sonneville, Valentin ULg et al

in Proceedings of ASME2013 International Design Engineering Technical Conference & Computers and Information in Engineering Conference IDETC/CIE 2013 (2013, August)

In this paper, a new contact formulation defined between flexible bodies modeled as superelements is investigated. Unlike rigid contact models, this approach enables to study the deformation and vibration ... [more ▼]

In this paper, a new contact formulation defined between flexible bodies modeled as superelements is investigated. Unlike rigid contact models, this approach enables to study the deformation and vibration phenomena induced by hard contacts. Compared with full-scale finite element models of flexible bodies, the proposed method is computationally more efficient, especially in case of a large number of bodies and contact conditions. The compliance of each body is described using a reduced-order elastic model which is defined in a corotational frame that follows the gross motion of the body. The basis used to reduce the initial finite element model relies on the Craig-Bampton method which uses both static boundary modes and internal vibration modes. The formulation of the contact condition couples all degrees of freedom of the reduced model in a nonlinear way. The relevance of the approach is demonstrated by simulation results first on a simple example, and then on a gear pair model. [less ▲]

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See detailA Tool for Design Decision Making Zero Energy Residential Buildings in Hot Humid Climate
Attia, Shady ULg; Gratia, Elisabeth; De Herde, Andre et al

in Proceedings of the 13th Conference of International Building Performance Simulation Association (2013, August)

Informed decision-making is the basis for the design of Net Zero Energy Buildings (NZEBs). This paper investigates the use of building performance simulation tools as a method of informing the design ... [more ▼]

Informed decision-making is the basis for the design of Net Zero Energy Buildings (NZEBs). This paper investigates the use of building performance simulation tools as a method of informing the design decision of NZEBs. The aim of this study was to develop a design decision making tool, ZEBO, for zero energy residential buildings in hot climates and to evaluate the effect of a simulation-based decision aid, on informed decision-making using sensitivity analysis. An assessment of the role of the BPS tools used in informing the decision-making was ascertained through cases studies, usability testing and several self-reported metrics. The paper provides results that shed light on the effectiveness of sensitivity analysis as an approach for informing the design decisions of NZEBs [less ▲]

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See detailAccuracy of clinical examination and field tests for diagnosis of traumatic reticulo-peritonitis in cattle : a preliminary study
Gaillot, Claire ULg; Detilleux, Johann ULg; Touati, Kamal ULg et al

in Proceedings of the Buiatrissima 8th ECBHM Symposium (2013, August)

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See detailStrategies for computation and inversion of the additive relationship matrix among genotyped animals
Faux, Pierre ULg; Gengler, Nicolas ULg

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

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See detailControlled field study comparing organic and inorganic trace elements supplementation in hypermuscled Belgian Blue Breed: biochemical aspects
Guyot, Hugues ULg; Martin-Tereso, Javier; Litjens, Wilbert et al

in Proceedings of the Buiatrissima 8th ECBHM symposium (2013, August)

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See detailNumerical computation of nonlinear normal modes of nonconservative systems
Renson, Ludovic ULg; Kerschen, Gaëtan ULg

in Proceedings of the ASME IDETC/CIE 2013 (2013, August)

Since linear modal analysis fails in the presence of nonlinear dynamical phenomena, the concept of nonlinear normal modes (NNMs) was introduced with the aim of providing a rigorous generalization of ... [more ▼]

Since linear modal analysis fails in the presence of nonlinear dynamical phenomena, the concept of nonlinear normal modes (NNMs) was introduced with the aim of providing a rigorous generalization of linear normal modes to nonlinear systems. Initially defined as periodic solutions, numerical techniques such as the continuation of periodic solutions were used to compute NNMs. Because these methods are limited to conservative systems, the present study targets the computation of NNMs for nonconservative systems. Their definition as invariant manifolds in phase space is considered. Specifically, the partial differential equations governing the manifold geometry are considered as transport equations and an adequate finite element technique is proposed to solve them. The method is first demonstrated on a conservative nonlinear beam and the results are compared to standard continuation techniques. Then, linear damping is introduced in the system and the applicability of the method is demonstrated. [less ▲]

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See detailHAEMATOLOGICAL PROFILES OF CALVES BELONGING TO HERDS WITH BOVINE NEONATAL PANCYTOPENIA HISTORY IN AND AROUND WALLONIA (BELGIUM).
Ronzoni, Anna ULg; Theron, Léonard ULg; Bayrou, Calixte ULg et al

in Buiatrissima, 8th ECBHM Symposium, 28-30 August 2013, Bern, Proceedings (2013, August)

The objective of the present study was to verify the hypothesis of subclinical BNP cases, by random sampling and haematological analysis in different herds with BNP history, in order to obtain a better ... [more ▼]

The objective of the present study was to verify the hypothesis of subclinical BNP cases, by random sampling and haematological analysis in different herds with BNP history, in order to obtain a better epidemiological picture of this disease. [less ▲]

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See detailPrevalence of Campylobacter spp infection in male mule ducks in Belgium
Flament, Aline; Soubbotina, Alexandra ULg; Mainil, Jacques ULg et al

in Abstracts of the XVIIIth World Veterinary Poultry Association Congress (2013, August)

Salmonella enterica and Campylobacter spp food poisoning are major public health burden. In Belgium, breeding of mule duck is well developed and “foie gras” consumption shows a yearly increase. Flament et ... [more ▼]

Salmonella enterica and Campylobacter spp food poisoning are major public health burden. In Belgium, breeding of mule duck is well developed and “foie gras” consumption shows a yearly increase. Flament et al. (2012) published a paper on the Belgian Salmonella spp infection in ducks but up to now there are no data about Campylobacter prevalence. The monitoring of Campylobacter spp infections was performed from March 2008 to April 2009 in 9 Belgian duck farms starting at the arrival of French ducklings up to the end of the force-feeding period. Cotton-tipped swabs of droppings were collected in duckling transportation boxes 24 to 48 h after the arrival of animals in the farm. Pools of bird droppings (10 to 50 g in 3 to 5 samples, representative of the housing area) were collected at 3, 6, 9 weeks of age and at time of introduction in the force-feeding rooms (at 11 or 12 weeks of age). A membrane filter method adapted from the original Steele and Mc Dermott (1984) method was used. After the filtering step, Campy blood free selective medium plates were incubated at 37°C, micro-aerobically ([O2] < à 10%) in anaerobic jars and colonies corresponding to putative Campylobacter spp were further identified with the API Campy® system. Campylobacter spp was isolated from all flocks, most of the time already at arrival of ducklings or at 3 weeks of age. Campylobacter jejuni subsp. jejuni (32/42) was the most frequent species isolated (Fig.1). Campylobacter coli (3/42), Campylobacter jejuni subsp. doylei (2/42) and Helicobacter fennelliae (3/42) were unfrequently isolated. Two isolates could not be identified to the species. Our results confirm those of Tsai et Hsiang (2005) who found a prevalence of 92% for Campylobacter in Taiwan. The isolations of Campylobacter jejuni subsp. doylei and Helicobacter fennelliae were unexpected. Indeed man is considered the reservoir of Campylobacter jejuni subsp. doyley and up to now the isolation of Helicobacter was never reported from ducks (Anas platyrhynchos) (Murphy et al., 2005). In conclusion the putative role of mule ducks in the transmission of Campylobacter food borne illness should not be underestimated [less ▲]

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See detailTracking network state from combined SCADA and synchronized phasor measurements
Glavic, Mevludin ULg; Van Cutsem, Thierry ULg

in Proceedings of the 2013 IREP Symposium-Bulk Power System Dynamics and Control -IX (2013, August)

Initiated by the authors’ previous work on state reconstruction from a limited number of synchrophasors [1], this paper goes one step further by exploring the possibility to track the network state using ... [more ▼]

Initiated by the authors’ previous work on state reconstruction from a limited number of synchrophasors [1], this paper goes one step further by exploring the possibility to track the network state using both SCADA and synchronized phasor measurements. When a SCADA measurement is received, it is used in the next state reconstruction; otherwise, it is replaced by a pseudo-measurement stemming from the previous state reconstruction. The approach resorts to a standard weighted least squares formulation and Hachtel’s augmented matrix method. State reconstruction is intended to be used at a much higher rate than classical state estimation, for instance every second. It has been validated using simulated measurements obtained from detailed time simulation. [less ▲]

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See detailControlled field study comparing organic and inorganic trace elements supplementation in hypermuscled Belgian Blue Breed: clinical aspects
Rollin, Frédéric ULg; Martin-Tereso, Javier; Litjens, Wilbert et al

in Proceedings of the Buiatrissima 8th ECBHM symposium (2013, August)

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See detailLe contexte urbain et climatique des risques hydrologiques de la ville de Butembo (Nord Kivu/ RDC)
Sahani, Muhindo; Ozer, Pierre ULg; Moeyersons, Jan

in 8th International conference (IAG) on Geomorphology: « Geomorphology and sustainability », Paris, 27-31 August 2013 (2013, August)

Butembo constitue un cas typique de zone urbaine en région tropicale humide rencontrant une explosion démographique exceptionnelle. La concentration spontanée des populations, due à l’exode incontrôlé sur ... [more ▼]

Butembo constitue un cas typique de zone urbaine en région tropicale humide rencontrant une explosion démographique exceptionnelle. La concentration spontanée des populations, due à l’exode incontrôlé sur un territoire assez restreint, a conduit à une urbanisation sans cesse croissante. L’imperméabilisation des vastes étendues de terres consécutive à une 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 progressif et régressif, inondations, et remobilisation d’anciens glissements de terrain. Après avoir réalisé la carte de la ville de Butembo, ce travail aboutit notamment à la production d’une carte des risques hydrologiques sur base d’approches combinant la télédétection et travaux de terrain. Les résultats révèlent une expansion urbaine exceptionnelle. L’emprise urbaine de la ville de Butembo est passée de 2,39 km² en 1957 à 85,83 km² en 2008. Son accroissement est consécutif à l’augmentation de la population qui est passée de 9 653 à 581 449 habitants entre 1957 et 2008. Cette urbanisation a abouti à une nouvelle affectation du sol avec des conséquences sur le paysage urbain. Depuis 1957, le ravinement de fond de vallée ainsi que celui sur les versants sont toujours restés confinés à l’intérieur des extensions urbaines respectives. L’urbanisation précède le développement des ravins et ceux-ci sont confinés dans les zones où le coefficient d’écoulement est accentué par elle. Les inondations pourraient s’étendre sur tous les fonds plats de vallées en cas d’inaction. Quant aux 16 glissements de terrain actifs, ils se trouvent dans la phase de creep et 11 sont partiellement co-engendrés par la sismicité. La pluie n’est pas à la base de l’accentuation des problèmes environnementaux qui perturbent la structure urbaine de Butembo. C’est bien l’urbanisation qui en est la principale cause. [less ▲]

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See detailGenetic effects of heat stress on milk yield and MIR predicted methane emissions of Holstein cows
Vanrobays, Marie-Laure ULg; Gengler, Nicolas ULg; Kandel, Purna Bhadra ULg et al

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

Dairy cows both contribute to and are affected by climate change. Breeding for heat tolerance and reduced methane (CH4) emissions is a key requirement to mitigate interactions between dairy cows and ... [more ▼]

Dairy cows both contribute to and are affected by climate change. Breeding for heat tolerance and reduced methane (CH4) emissions is a key requirement to mitigate interactions between dairy cows and climate change. This study was aimed to estimate genetic variation of milk yield and CH4 emissions over the whole trajectory of temperature humidity index (THI) using a reaction norm approach. A total of 257,635 milk test-day (TD) records and milk mid-infrared (MIR) spectra from 51,782 Holstein cows were used. Data were collected between January 2007 and December 2010 in 983 herds by the Walloon Breeding Association (Ciney, Belgium). The calibration equation developed by Vanlierde et al. (Abstract submitted to EAAP 2013; R² of cross-validation=0.70) was applied on the spectral data in order to predict CH4 emissions values (g CH4/d). These values were divided by fat and protein corrected milk yield (FPCM) defining a new CH4 trait (g CH4/kg of FPCM). Daily THI values were calculated using the mean of daily values of dry bulb temperature and relative humidity from meteorological data. Mean daily THI of the previous 3 days before each TD record was used as the THI of reference for that TD. Bivariate (milk yield and a CH4 trait) random regression TD mixed models with random linear regressions on THI values were used. Estimated average daily heritability for milk yield was 0.17 and decreased slightly at extreme THI values. However, heritabilities of MIR CH4 traits increased as THI values increase: from 0.10 (THI=28) to 0.14 (THI=75) for MIR CH4 (g/d) and from 0.14 (THI=28) to 0.21 (THI=75) for MIR CH4 (g/kg of FCPM). Genetic correlations between milk yield and MIR CH4 (g/d) ranged from -0.09 (THI=28) to -0.12 (THI=75) and those between milk yield and MIR CH4 (g/kg of FPCM) from -0.75 (THI=28) to -0.71 (THI=75). These results showed that milk production and CH4 emissions of dairy cows seemed to be influenced by THI. [less ▲]

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See detailCombination of genotype, pedigree, local and foreign information
Vandenplas, Jérémie ULg; Colinet, Frédéric ULg; Gengler, Nicolas ULg

in Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science (2013, August)

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See detailApplication of the Cradle to Cradle paradigm to a housing unit in Switzerland: Findings from a prototype design
Attia, Shady ULg; Beney, Jean François; Andersen, Marilyne

in PLEA 2013 Munich: Sustainable Architecture for a Renewable Future (2013, August)

The Cradle to Cradle (C2C) paradigm is emerging as an important regenerative design approach. C2C is aiming to create a positive footprint of the built environment, beyond carbon neutrality. The general ... [more ▼]

The Cradle to Cradle (C2C) paradigm is emerging as an important regenerative design approach. C2C is aiming to create a positive footprint of the built environment, beyond carbon neutrality. The general idea of the C2C approach is to design products, in this case buildings, in order to have a positive impact on the planet, instead of trying to go beyond the zero environmental impact concept. However, there are very few studies that address the application of the C2C concept in building design. More importantly, there is hardly any documentation processes on methods or tools currently being used to design and evaluate C2C buildings. Therefore, the purpose of this paper is to design, model and assess a C2C building prototype with a focus on energy and materials. The research methodology is based on literature review, case study design and performance (energy/materials) evaluation (DesignBuilder/SimaPro). The paper articulates the values, principles and goals of the C2C paradigm and translates them through the prototype design in the Swiss context. The results of the prototype design point to a 74% independence from non-renewable energy resources, compensating the operating and embodied energy during the building’s life. On the other hand only 8% of the building materials were totally recyclable according to the C2C principles. The design process delivers insights on the application of the C2C concept in the built environment reporting on the limitation and means of improvement. [less ▲]

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See detailComputational Optimisation for Zero Energy Buildings Design Interviews results with twenty eight International expert
Attia, Shady ULg; Hamdy, Mohamed; O’Brien, William et al

in Proceedings of the 13th Conference of International Building Performance Simulation Association (2013, August)

This paper summarizes a study that was undertaken to reveal potential challenges and opportunities for integrating optimisation tools in Net/Nearly Zero Energy Buildings (NZEB) Design. The paper reviews ... [more ▼]

This paper summarizes a study that was undertaken to reveal potential challenges and opportunities for integrating optimisation tools in Net/Nearly Zero Energy Buildings (NZEB) Design. The paper reviews current trends in simulation-based Building Performance Optimisation (BPO) and outlines major criteria for optimisation tools selection and evaluation. This is based on analyzing users’ needs for tools capabilities and requirement specifications. The review is carried out by means of interviews with 28 optimisation experts. The findings are based on an inter-group comparison between experts. The aim is to assess the gaps and needs for integrating BPO tools in NZEB Design. The findings indicate existing limitations including model uncertainty, computation time, difficulty of implementation and steep learning curve. Future directions anticipated or needed for improvement of current tools are presented. [less ▲]

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See detailBenchmark Models for Air Conditioned Residential Buildings in Hot Humid Climate
Attia, Shady ULg; Evrard, Arnaud

in Proceedings of the 13th Conference of International Building Performance Simulation Association (2013, August)

This study reports the results of a recent field survey for residential apartment buildings in Egypt. The aim of the survey is to create representative building energy models. Two building performance ... [more ▼]

This study reports the results of a recent field survey for residential apartment buildings in Egypt. The aim of the survey is to create representative building energy models. Two building performance simulation models are created reflecting the average energy consumption characteristics of air-conditioned residential apartments in Alexandria, Cairo and Asyut. Aiming for future evaluation of the cost and energy affects of the new Egyptian energy standard this study established two detailed models describing the energy use profiles for air-conditioners, lighting, DHW and appliances in respect to buildings layout and construction. Using EnergyPlus simulation tool the collected surveyed data was used as input for two building simulation models. The simulation models were verified against the apartment characteristic found in the survey. This paper presents details of the building models including the energy use patterns and profiles created for this study. [less ▲]

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See detailA FEW GOOD REASONS TO CONSIDER A BEAM FINITE ELEMENT FORMULATION ON THE LIE GROUP SE(3)
Sonneville, Valentin ULg; Bruls, Olivier ULg

in Proceedings of the ASME 2013 International Design Engineering Technical Conference & Computers and Information in Engineering Conference IDETC/CIE 2013 (2013, August)

Based on an original interpolation method we develop a beam finite element formulation on the Lie group SE(3) which relies on a mathematically rigorous framework and provides compact and generic notations ... [more ▼]

Based on an original interpolation method we develop a beam finite element formulation on the Lie group SE(3) which relies on a mathematically rigorous framework and provides compact and generic notations. We work out the beam kinematics in the SE(3) context, the beam deformation measure and obtain the expression of the internal forces using the virtual work principle. The proposed formulation exhibits important features from both the theoretical and numerical points of view. The approach leads to a natural coupling of position and rotation variables and thus differs from classical Timoshenko/Cosserat formulations. We highlight several important properties such as a constant deformation measure over the element, an invariant tangent stiffness matrix under of rigid motions or the absence of shear locking. [less ▲]

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See detailErosion littorale et migrations forcées de réfugiés environnementaux. L'exemple de Cotonou, Bénin
Ozer, Pierre ULg; Hountondji, Yvon-Carmen; De Longueville, Florence ULg

in 8th International conference (IAG) on Geomorphology: « Geomorphology and sustainability », Paris, 27-31 August 2013 (2013, August)

Situé dans le Golfe de Guinée, le littoral béninois est soumis –sur certains tronçons– à une érosion assez rapide ces dernières décennies. Cette érosion côtière est principalement due actuellement aux ... [more ▼]

Situé dans le Golfe de Guinée, le littoral béninois est soumis –sur certains tronçons– à une érosion assez rapide ces dernières décennies. Cette érosion côtière est principalement due actuellement aux activités humaines parmi lesquelles les perturbations sédimentaires occasionnées par la construction de divers barrages dont celui de Nangbéto sur le fleuve Mono ; le blocage du transit littoral par les ouvrages portuaires de Cotonou ; les carrières de sable exploitées à même la plage ; et la diminution d’apports sédimentaires provenant de l’ouest suite à divers travaux de protection des côtes. En utilisant la fonction multi dates disponible dans Google Earth, cet article estime la superficie érodée à Cotonou entre 2002 et 2011 à l’est de l’exutoire du Lac Nokoué. En outre, il évalue le nombre de maisons détruites ainsi que le nombre de personnes contraintes à une migration forcée. Les figures sont importantes puisque de l’ordre de cent mètres de zone côtière ont totalement disparu au cours des dix dernières années sur un tronçon de près de six kilomètres de long en pleine ville ou en proche périphérie. Cette analyse montre qu’actuellement les dommageables modifications géomorphologiques résultent essentiellement de l’addition non envisagée d’activités humaines couplée à l’absence de gouvernance. Par ailleurs, nous sommes en droit de nous interroger sur les risques d’érosion côtière dans les décennies à venir avec l’amplification annoncée de l’augmentation du niveau des océans due au réchauffement climatique. [less ▲]

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See detailSemi-Continuous Fermentation for Gluconic acid Production at High Temperature
Zarmehrkhorshid, Raziyeh ULg; Shafiei, Rasoul ULg; Thonart, Philippe ULg

in World Acadamy of Science, Engineering and Technology (2013, July 31)

Gluconic acid (GA) is a multifunctional organic acid with versatile applications in food, beverage and pharmaceutical industries. Recently, owing to increasing demand for cheaper gluconic acid and its ... [more ▼]

Gluconic acid (GA) is a multifunctional organic acid with versatile applications in food, beverage and pharmaceutical industries. Recently, owing to increasing demand for cheaper gluconic acid and its salts; studies have mainly focused on more economical production process through using cheaper carbohydrate sources and isolation of appropriate microorganism. Despite progress towards its microbial production, fewer studies are available regarding its bacterial production at high temperature. It is believed that, withstanding high temperature during production of this acid can provide a new option for industrially cost effective production through reduction in cost of cooling. Results: A major challenge associated with semi-continuous process of gluconate production using A. senegalensis was inability in glucose consumption during the late stationary phase and next fermentation cycles. Inactivation of respiration system (total dehydrogenases activity) and entrance of cells into viable but nonculturable (VBNC) state during stationary phase were the main reasons of this inability. Conclusions: To improve gluconic acid fermentation at high temperature, it is necessary to induce the activity of total dehydrogenases as they carry the oxidation reaction of glucose. Supplementing the feed with ethanol, successfully conferred ability to cells for further glucose consumption. [less ▲]

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See detailEndokarsts and cryptokarsts in Cretaceous coarse and higly porous chalk at the Belgian-Dutch border
Willems, Luc ULg; Rodet, Joël

in Filippi, Michal; Bosák, Pavel (Eds.) Proceedings of the 16th International Congress of Speleology, July 21–28, Brno. Volume 3, p. 499. Czech Speleological Society. Praha. (2013, July 21)

Since 2003, the study of several quarries at the Belgian-Dutch border has made it possible to identify numerous karsts essentially developed in coarse chalk (calcarenites) of the Maastricht Formation ... [more ▼]

Since 2003, the study of several quarries at the Belgian-Dutch border has made it possible to identify numerous karsts essentially developed in coarse chalk (calcarenites) of the Maastricht Formation (Upper Cretaceous). This lithology is highly porous and is often considered unfavorable to karstification. However, caves, solution pipes, sponge networks, roof channel, pockets (alveoli) several meters in diameter developed inside without connection to fractures. These karsts belong to flooded karsts (caves and pockets) or to younger cryptokarsts (input karst type – thousands of solution pipes). When the endokarsts dewater, the high porosity of calcarenites inhibits closed caves from evolving. Tubular solution pipes are produced by the seepage water under fluvial terrace gravels and can exceed 30 m deep under the surface plateau. Sometimes, they encounter caves which are consequently filled and fossilized. By this process, they preserve caves from further collapsing inside a crumbly lithology. [less ▲]

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See detailVerification of a novel material model to predict damage in composite structures
Chiu, Louis N.S.; Falzon, Brian G.; Boman, Romain ULg et al

in International Conference on Structural Integrity and Fracture (2013, July 11)

An intralaminar damage model (IDM), based on continuum damage mechanics, was developed for the simulation of composite structures subjected to damaging loads. This model can capture the complex ... [more ▼]

An intralaminar damage model (IDM), based on continuum damage mechanics, was developed for the simulation of composite structures subjected to damaging loads. This model can capture the complex intralaminar damage mechanisms, accounting for mode interactions, and delaminations. Its development is driven by a requirement for reliable crush simulations to design composite structures with a high specific energy absorption. This IDM was implemented as a user subroutine within the commercial finite element package, Abaqus/Explicit[1]. In this paper, the validation of the IDM is presented using two test cases. Firstly, the IDM is benchmarked against published data for a blunt notched specimen under uniaxial tensile loading, comparing the failure strength as well as showing the damage. Secondly, the crush response of a set of tulip-triggered composite cylinders was obtained experimentally. The crush loading and the associated energy of the specimen is compared with the FE model prediction. These test cases show that the developed IDM is able to capture the structural response with satisfactory accuracy. [less ▲]

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See detailIntervention ergonomique à visée cognitive pour le maintien au travail de patients atteints de sclérose en plaques : construction d’une méthodologie et validation d’un questionnaire
Blavier, Adelaïde ULg; Monisse, Aurélié; DELRUE, Gaël ULg et al

in Van de Leemput, Cécile (Ed.) Activités humaines, Technologies et Bien-être (2013, July 11)

The purpose of this paper is to present the construction of a questionnaire in order to evaluate the specific work difficulties and compensation mechanisms developed by multiple sclerosis patients (MS ... [more ▼]

The purpose of this paper is to present the construction of a questionnaire in order to evaluate the specific work difficulties and compensation mechanisms developed by multiple sclerosis patients (MS). At the moment, it does not exist any questionnaire that links the patients cognitive deficits with their professional situation. This lack of accurate assessment is detrimental to the patients job retention. Our questionnaire was constructed from review of literature and interviews of patients and experts. Three groups of patients answered the questionnaire: MS patients, diabetics patients and a control group. We controlled the effect of anxiety and depression and we conducted a factorial analysis that showed the existence of 3 factors: the ergonomics factor (that includes cognitive difficulties and resources and adaptation process), the description of work situation and the social support. The three groups of participants obtained similar results for the work description and the social support while the group of patients with MS obtained a higher score than the other 2 groups for the ergonomics factor. These results suggest that our questionnaire is specific to the MS patients population and to their difficulties they met in their work situations. These results offered also some ways to increase job retention in MS patients population. [less ▲]

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See detailDry galloping on bridge cables: roughness and shape effects on an inclined circular cylinder
Benidir, Adel; Flamand, Olivier; Gaillet, Laurent et al

in Proceedings of the European-African Conference on Wind Engineering 2013 (2013, July 09)

Dry galloping of stays in cable-stayed bridges is a phenomenon that is still of interest to the scientific community. Over the course of the current three-year research project numerous experiments will ... [more ▼]

Dry galloping of stays in cable-stayed bridges is a phenomenon that is still of interest to the scientific community. Over the course of the current three-year research project numerous experiments will be carried out to investigate the effect of turbulence and inclination angle on dry galloping. The novel aspect of this study consists of an in-depth investigation into the effect of non uniformity of the pipe surrounding the stay cables on the dry galloping excitation mechanism. Previous studies reported that dry galloping is caused by the appearance of a negative pressure bubble on one side of the circular cylinder at the critical Reynolds number range, leading to a rapid drop in the drag coefficient and the appearance of a non negligible lift force. This paper presents results from initial experiments in the wind tunnel at CSTB – Nantes, France. [less ▲]

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See detailUncoupled spectral analysis with non-proportional damping
Canor, Thomas ULg; Blaise, Nicolas ULg; Denoël, Vincent ULg

in Proceedings of the European-African Conference on Wind Engineering (2013, July 07)

The use of normal modes of vibration in the analysis of structures with non-proportional damping reduces the number of governing equations, but does not decouple them. A common practice consists in ... [more ▼]

The use of normal modes of vibration in the analysis of structures with non-proportional damping reduces the number of governing equations, but does not decouple them. A common practice consists in decoupling the equations by disregarding the off-diagonal elements of the modal damping matrix. This paper proposes a method based on the asymptotic expansion of the modal transfer matrix to take into account the modal coupling in Gaussian spectral analysis. First, the mathematical background is introduced, then the relevance of the method is illustrated within the context of the analysis of a large and real structure submitted to wind loadings. [less ▲]

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See detailPrincipal static wind loads
Blaise, Nicolas ULg; Denoël, Vincent ULg

in 6th Proceedings of European-African Conference on Wind Engineering (2013, July 07)

The concept of static wind load is widely used in practice for structural wind design. In this context, this paper assesses the envelope reconstruction problem stated as follows: find the best set of ... [more ▼]

The concept of static wind load is widely used in practice for structural wind design. In this context, this paper assesses the envelope reconstruction problem stated as follows: find the best set of static loadings that is optimum to reproduce by static analyses, the envelope values of structural responses resulting from a formal buffeting dynamic analysis. A solution was recently derived by means of Principal Static Wind Loads which are well-suited for this problem. The concept is illustrated with a large stadium roof and the accuracy of the envelope reconstruction is analysed. [less ▲]

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See detail3D Modeling of Thin Resistive Sheets in the Discontinuous Galerkin Method for Transient Scattering Analysis
Boubekeur, Mohamed; Kameni, Abelin; Bernard, Laurent et al

in Proceedings of the 19th Conference on the Computation of Electromagnetic Fields (COMPUMAG 2013) (2013, July 03)

This papers presents a modeling of thin resistive sheets. An interface condition is used to avoid the fine mesh. The electromagnetic fields are computed with a time domain Discontinuous Galerkin method in ... [more ▼]

This papers presents a modeling of thin resistive sheets. An interface condition is used to avoid the fine mesh. The electromagnetic fields are computed with a time domain Discontinuous Galerkin method in order to evaluate the shielding effectiveness. A 3D cavity is treated to illustrate the efficiency of the condition. [less ▲]

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See detailSPECULOOS: Search for habitable Planets EClipsing ULtra-cOOl Stars
Gillon, Michaël ULg; Jehin, Emmanuel ULg; Delrez, Laetitia ULg et al

in Protostars and Planets VI, Heidelberg, July 15-20, 2013. Poster #2K066 (2013, July 01)

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

The 1000 nearest ultra-cool stars (spectral type M6 and latter) represent a unique opportunity for the search for life outside our solar system. Due to their small luminosity, their habitable zone is 30-100 times closer than for the Sun, the corresponding orbital periods ranging from one to a few days. Thanks to this proximity, the transits of a habitable planet are much more probable and frequent than for an Earth-Sun analog, while their tiny size (about 1 Jupiter radius) leads to transits deep enough for a ground-based detection, even for sub-Earth size planets. Furthermore, a habitable planet transiting one of these nearby ultra-cool stars would be amenable for a thorough atmospheric characterization, including the detection of possible biosignatures, notably with the near-to-come JWST. Motivated by these reasons, we have set up the concept of a ground-based survey optimized for detecting planets of Earth-size and below transiting the nearest Southern ultra-cool stars. We present here this concept and its status. [less ▲]

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See detailYield variability linked to climate uncertainty and nitrogen fertilisation
Dumont, Benjamin ULg; Basso, Bruno; Leemans, Vincent ULg et al

in Stafford, John V. (Ed.) Precision agriculture '13 (2013, July)

At the parcel scale, crop models such as STICS are powerful tools to study the effects of variable inputs such as management practices (e.g. nitrogen (N) fertilisation). In combination with a weather ... [more ▼]

At the parcel scale, crop models such as STICS are powerful tools to study the effects of variable inputs such as management practices (e.g. nitrogen (N) fertilisation). In combination with a weather generator, we built up a general methodology that allows studying the yield variability linked to climate uncertainty, in order to assess the best N practice. Our study highlighted that, applying the Belgian farmer current N practice (60 60 60 kgN.ha-1), the yield distribution was found to be very asymmetric with a skewness of -1.02 and a difference of 5% between the mean (10.5 t.ha-1) and the median (11.05 t.ha-1) of the distribution. Which implied that, under such practice, the probability for farmers to achieve decent yields, in comparison of the mean of the distribution, was the highest. [less ▲]

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See detailInfluence des communications sur la construction du common ground. Proposition d'une méthodologie d'analyse de la dynamique temporelle des échanges multimodaux.
Defays, Aurore ULg; Leclercq, Pierre ULg; Nyssen, Anne-Sophie ULg

in van de Leemput, Cécile; Chauvin, Christine; Hellemans, Catherine (Eds.) Activités humaines, Technologies et Bien-être (EPIQUE 2013) (2013, July)

L’objectif de cette étude est de présenter une méthodologie d’analyse des communications multimodales dans les situations de conception collective. Cette méthodologie permet de décrire quelles sont les ... [more ▼]

L’objectif de cette étude est de présenter une méthodologie d’analyse des communications multimodales dans les situations de conception collective. Cette méthodologie permet de décrire quelles sont les modalités de communication qui supportent particulièrement l’élaboration du common ground, zone de partage indispensable pour l’efficacité de la communication, et donc pour la performance collaborative. La méthode présentée vise également à pouvoir identifier les articulations pertinentes entre modalités de communication, dans le sens où elles favorisent l’élaboration de ce processus. Dans une première phase de notre recherche, nous avons observé et analysé les échanges multimodaux tels qu’ils prennent place en situation « naturelle » (ou non-médiatisée) dans le but de prétester notre méthode, mais également de pouvoir comparer cette situation avec les situations de collaboration distantes et outillées par des nouvelles technologies que nous envisagerons par la suite. [less ▲]

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See detailMultiple Viewpoints on Landscape Quality Assessment: some evidence from a survey in Wallonia and Romania
Schmitz, Serge ULg; Vanderheyden, Vincent ULg; Teleuca, Alexandra et al

in Morimoto, Takehiro; Ichikawa, Yasuo; Kim, Doo-Chul (Eds.) Globalization and New Challenges of Agricultural and Rural Systems (2013, July)

Actually assessing landscapes out of a specific framework is not an easy task due to the multiple functions that landscapes perform.The paper presents the result of a survey among landscape experts in ... [more ▼]

Actually assessing landscapes out of a specific framework is not an easy task due to the multiple functions that landscapes perform.The paper presents the result of a survey among landscape experts in Romania and Wallonia. Expert had to specify their level of agreement on 52 Likert items regarding landscape quality indicators [less ▲]

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See detailPrediction of non-linear time-variant dynamic crop model using bayesian methods
Mansouri, Majdi ULg; Dumont, Benjamin ULg; Destain, Marie-France ULg

in John Stafford (Ed.) Precision agriculture '13 (2013, July)

This work addresses the problem of predicting a non-linear time-variant leaf area index and soil moisture model (LSM) using state estimation. These techniques include the extended Kalman filter (EKF ... [more ▼]

This work addresses the problem of predicting a non-linear time-variant leaf area index and soil moisture model (LSM) using state estimation. These techniques include the extended Kalman filter (EKF), particle filter (PF) and the more recently developed technique, variational filter (VF). In the comparative study, the state variables (the leaf-area index LAI, the volumetric water content of the layer 1, HUR1 and the volumetric water content of the layer 2, HUR2) are estimated from noisy measurements of these variables, and the various estimation techniques are compared by computing the estimation root mean square error with respect to the noise-free data. The results show that VF provides a significant improvement over EKF and PF. [less ▲]

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See detailContributions to the process modelling of resin infusion under flexible tooling (RIFT) manufacturing for composite aerostructures
Pierce, R.S.; Falzon, B.G.; Thompson, M.C. et al

in Proceedings of ICCM19 (2013, July)

The cost of manufacturing textile-reinforced composite aerostructures using Resin Infusion under Flexible Tooling (RIFT) can be reduced by computational modelling. This paper outlines the current progress ... [more ▼]

The cost of manufacturing textile-reinforced composite aerostructures using Resin Infusion under Flexible Tooling (RIFT) can be reduced by computational modelling. This paper outlines the current progress and contributions made towards this goal. A continuum-based material model was incorporated into a finite element package to simulate the draping of a dry carbon fibre fabric. It accurately tracks the changes in the warp and weft fibre orientations and has been experimentally validated. Material characterisation was performed to determine the tensile and shear properties of a plain weave fabric reinforcement material. In support of bias extension shear testing, an accessible Digital Image Correlation (DIC) approach was developed for accurate optical strain measurement. A relationship between permeability and shear angle was also experimentally determined using a novel permeability measurement technique. Future work is planned to combine all these aspects in an infusion model and demonstrate the complete process model. [less ▲]

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See detailNumerical and Experimental Investigation of Slot-Blowing Air Over a Cylinder
Runge, William; Buysschaert, Frank; Hayez, Jules et al

in Proceedings of the 5th European Conference for Aeronautics and Space Sciences (2013, July)

Tangential slot blowing around a cylinder in the Coanda effect has been proposed as a mechanism for yaw control in a novel coaxial helicopter. The proposed design has been investigated computationally ... [more ▼]

Tangential slot blowing around a cylinder in the Coanda effect has been proposed as a mechanism for yaw control in a novel coaxial helicopter. The proposed design has been investigated computationally, using the unsteady k-ω SST solver in NUMECA, as well as experimentally in the wind tunnel at the Université de Liège. While the concept in general is promising, it has been shown that there are some potential problems, including pitch-yaw coupling and some unsteady flow conditions. These problems exist under varied circumstances, and, exist at least in part due to the complicated flow-field in this problem, even in 2-dimensions. [less ▲]

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See detailIdentification of mechanical systems with local nonlinearities through discrete-time Volterra series and Kautz functions
Shiki, Sidney Bruce; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg et al

in Proceedings of the 11th International Conference on Recent Advances in Structural Dynamics (2013, July)

Mathematical modeling of mechanical structures is an important research area in structural dynamics. One of the goals of this area is to obtain a model that accurately predicts the dynamics of the system ... [more ▼]

Mathematical modeling of mechanical structures is an important research area in structural dynamics. One of the goals of this area is to obtain a model that accurately predicts the dynamics of the system. However, the nonlinear eff ects caused by large displacements and boundary conditions like gap, backlash or joint are not as well understood as the linear counterpart. This paper identifies a non-parametric discrete-time Volterra model of a benchmark nonlinear structure consisting of a cantilever beam connected to a thin beam at its free end. Time-domain data experimentally measured are used to identify the Volterra kernels, which are expanded with orthogonal Kautz functions to facilitate the identification process. The nonlinear parameters are then estimated through a model updating process involving optimization of the residue between the numerical and experimental kernels. The advantages and drawbacks of the Volterra series for modeling the behavior of nonlinear structures are finally indicated with suggestions to overcome the disadvantages found during the tests. [less ▲]

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See detailEquivalent static wind loads for structures with non-proportional damping
Blaise, Nicolas ULg; Canor, Thomas ULg; Denoël, Vincent ULg

in Proceedings of the 11th International Conference on Recent Advances in Structural dynamics (2013, July)

In current practice, wind structural design is often carried out using the concept of equivalent static wind loads. The main characteristic of such loadings is to reproduce, with static analyses, the same ... [more ▼]

In current practice, wind structural design is often carried out using the concept of equivalent static wind loads. The main characteristic of such loadings is to reproduce, with static analyses, the same extreme structural responses as those resulting from a formal buffeting analysis. This paper proposes a method for the computation of equivalent static wind loads for structures with slight non-proportional damping in a modal framework. Because of the smallness of the out-of diagonal terms, this method is based on recent developments related to asymptotic expansion of the modal transfer matrix of such structures. As a main benefit, the static loading is described as a perturbation of the equivalent loading that would be obtained for the uncoupled system. The main contribution of this paper is to formalize the expression of the correction terms resulting from the non-proportionality of damping. The method is presented with a detailed illustrative example. [less ▲]

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See detailPoroelastic Center of Dilation Revisited
Huynen, Alexandre ULg; Detournay, Emmanuel

in Hellmich, Christian; Pichler, Bernhard; Dietmar, Adam (Eds.) Poromechanics V: Proceedings of the Fifth Biot Conference on Poromechanics (2013, July)

A comparison of the original elastic solution for the center of dilation with the classic Lame ́ solution reveals an unexpected dependence of the center of dilation solu- tion on Poisson’s ratio. This ... [more ▼]

A comparison of the original elastic solution for the center of dilation with the classic Lame ́ solution reveals an unexpected dependence of the center of dilation solu- tion on Poisson’s ratio. This inconsistency is investigated by means of two alternative representations of the singularity which lead to the identification of a compressed zone inside the singularity. The poroelastic equivalent to this nucleus of strain is shown to be the superposition of the elastic one with drained material parameters and an instan- taneous point fluid source associated with a finite volume of fluid that is expelled from the compressed region inside the singularity and is injected in the porous medium. [less ▲]

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