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See detailAn observational asteroseismic study of the pulsating B-stars in the open cluster NGC 884
Saesen, S.; Briquet, Maryline ULg; Aerts, C. et al

in IAU Symposium No. 301 (2013), "Precision Asteroseismology" (Wroclaw), W. Chaplin, J. Guzik, G. Handler & A. Pigulski (eds.) (2013, October 01)

Recent progress in the seismic interpretation of field {\beta} Cep stars has resulted in improvements of the physical description in the stellar structure and evolution model computations of massive stars ... [more ▼]

Recent progress in the seismic interpretation of field {\beta} Cep stars has resulted in improvements of the physical description in the stellar structure and evolution model computations of massive stars. Further asteroseismic constraints can be obtained from studying ensembles of stars in a young open cluster, which all have similar age, distance and chemical composition. We present an observational asteroseismic study based on the discovery of numerous multi-periodic and mono-periodic B-stars in the open cluster NGC 884. Our study illustrates the current status of ensemble asteroseismology of a young open cluster. [less ▲]

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See detailBiolixiviação de cobre contido em placas de circuito impresso (pci) com micro-organismos mesófilos.
Rodrigues, M; Gaydardzhiev, Stoyan ULg; Lopes, K et al

in Silva, André Carlos; Silva, Elenice Maria Schons (Eds.) ANAIS PROCEEDINGS (2013, October)

This work investigated the bioleaching of electronic waste, specifically printed circuit boards (PCB). The bio-assisted leaching was carried out with At. ferrooxidans in shake flasks in order to evaluate ... [more ▼]

This work investigated the bioleaching of electronic waste, specifically printed circuit boards (PCB). The bio-assisted leaching was carried out with At. ferrooxidans in shake flasks in order to evaluate the influence of presence of microorganisms on the dissolution of metallic copper. The effects of the initial Fe2+ concentration and the presence of pyrite, as a source of iron, on copper dissolution were analyzed. The experiments were performed in an orbital shaker under the following conditions: 34°C, stirring speed of 150 min-1, particle size below 420μm and 0.5% solids percent (w/v). The results indicated high extraction, around 100%, and proved the feasibility of copper recovering from PCB through bioleaching. [less ▲]

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See detailBioclimatic Design in Casablanca (Morocco): Decision Support through Building Performance Simulation
Attia, Shady ULg; Geoffrey, van Moeseke

in Proceedings of the 4th Biennial subtropical cities conference (2013, October)

In this paper, bioclimatic design strategies in Moroccan architecture have been analyzed for the city of Casablanca. The aim of this study is to enable architects to re-understand the lessons of tradition ... [more ▼]

In this paper, bioclimatic design strategies in Moroccan architecture have been analyzed for the city of Casablanca. The aim of this study is to enable architects to re-understand the lessons of tradition, because the way towards bioclimatic architecture should start by understanding vernacular architecture. The first part of the paper presents climate analysis and a set of bioclimatic principles addressing orientation, shading, thermal mass, insulation and natural ventilation as a mean for passive cooling. The second part explores the potential of implementing the Passivhaus Standard in Casablanca. Based on a validated building model, the performance of one of an apartment, satisfying the Passivhaus Standard has been determined by means of building performance simulation. The analysis evaluated different bioclimatic strategies and examined the transfer of the Passivhaus concept to hot warm climate, while ensuring thermal comfort during summer. Results showed that the studied building concept, comprising several bioclimatic design strategies can be transferred, with appropriate adaptations, also to hot climates. Finally the study developed significant recommendation that support architects with principles and strategies for bioclimatic design. [less ▲]

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See detailProceedings - Corporate Finance Day
Lambert, Marie ULg

in Proceedings - 11th Corporate Finance Day (2013, October)

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See detailIs the Sorensen test really a fatigue task for trunk extensor muscles?
Demoulin, Christophe ULg; Boyer, M.; GROSDENT, Stéphanie ULg et al

in Abstract book of the 8th Interdisciplinary World Congress on Low Back and Pelvic Pain (2013, October)

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See detailDéveloppement d'un dispositif de trajectographie optique nécessaire pour la caractérisation expérimentale par une approche Euler-Lagrange des écoulements dans des bioréacteurs à cuve agitée
Collignon, Marie-Laure ULg; Delafosse, Angélique ULg; Delvigne, Frank ULg et al

in Récents Progrès en Génie des Procédés (2013, October)

Les bioréacteurs à cuve agitée sont des dispositifs largement utilisés dans l’industrie pharmaceutique. Les performances globales des cultures menées dans ces bioréacteurs dépendent fortement de ... [more ▼]

Les bioréacteurs à cuve agitée sont des dispositifs largement utilisés dans l’industrie pharmaceutique. Les performances globales des cultures menées dans ces bioréacteurs dépendent fortement de l’environnement physico-chimique et hydrodynamique local rencontré par les microorganismes et ce au cours du temps. Pour parvenir à caractériser cet historique de conditions locales rencontrées, une approche Euler-Lagrange doit être adoptée. La difficulté dans ce type d’approche est d’être capable de mesurer de manière fiable la trajectoire suivie par le microorganisme au sein du bioréacteur. Pour ce faire, le Laboratoire de Génie Chimique de l’Université de Liège a conçu un dispositif de trajectographie optique. L’objectif de cet article est de présenter ce dispositif, les développements qui ont été nécessaire à sa mise en œuvre et les résultats obtenus. Le dispositif se compose de deux caméras observant selon deux axes de l’espace un bioréacteur rétro-éclairé par des panneaux leds. La trajectoire suivie par une particule noire en gel d’alginate de calcium de 491 µm de diamètre est construite à partir des images acquises par ces deux caméras préalablement modélisée par un modèle pinhole et traitées par une approche rationnée. La validité des trajectoires mesurées a été prouvée dans un bioréacteur de 20 L mélangé par une hélice TTP en comparant les champs de vitesse moyen et d’énergie cinétique turbulent extraits de la trajectoire avec ceux obtenus par la technique eulérienne Stéréo P.I.V. La convergence de ces deux champs avec le temps d’acquisition de la trajectoire a également été démontrée. [less ▲]

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See detailExploiting Socially-Generated Side Information in Dimensionality Reduction
Marcos Alvarez, Alejandro ULg; Yamada, Makoto; Kimura, Akisato

in Proceedings of the 2nd International Workshop on Socially-Aware Multimedia (2013, October)

In this paper, we show how side information extracted from socially-curated data can be used within a dimensionality reduction method and to what extent this side information is beneficial to several ... [more ▼]

In this paper, we show how side information extracted from socially-curated data can be used within a dimensionality reduction method and to what extent this side information is beneficial to several tasks such as image classification, data visualization and image retrieval. The key idea is to incorporate side information of an image into a dimensionality reduction method. More specifically, we propose a dimensionality reduction method that can find an embedding transformation so that images with similar side information are close in the embedding space. We introduce three types of side information derived from user behavior. Through experiments on images from Pinterest, we show that incorporating socially-generated side information in a dimensionality reduction method benefits several image-related tasks such as image classification, data visualization and image retrieval. [less ▲]

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See detailNetwork Fingerprinting: TTL-Based Router Signatures
Vanaubel, Yves ULg; Pansiot, Jean-Jacques; Mérindol, Pascal et al

in ACM/USENIX Internet Measurement Conference (2013, October)

Fingerprinting networking equipment has many potential applications and benefits in network management and security. More generally, it is useful for the understanding of network structures and their ... [more ▼]

Fingerprinting networking equipment has many potential applications and benefits in network management and security. More generally, it is useful for the understanding of network structures and their behaviors. In this paper, we describe a simple fingerprinting mechanism based on the initial TTL values used by routers to reply to various probing messages. We show that main classes obtained using this simple mechanism are meaningful to distinguish routers platforms. Besides, it comes at a very low additional cost compared to standard active topology discovery measurements. As a proof of concept, we apply our method to gain more insight on the behavior of MPLS routers and to, thus, more accurately quantify their visible/invisible deployment. [less ▲]

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See detailCertifier la compétence numérique : conception des épreuves
Vandeput, Etienne ULg

in Objets et méthodes d’enseignement de la maternelle à l’université (2013, October)

L'évaluation de la compétence numérique pose de nombreuses questions et, en particulier, celles des épreuves permettant de la certifier.

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See detailANAEROBIC DIGESTION WITH BIOHYDROGEN PRODUCTION FROM ORGANIC WASTES : STATE-OF-THE ART
Hiligsmann, Serge ULg; Beckers, L.; Hamilton, C. et al

in Proceedings Sardinia 2013 (2013, October)

Hydrogen (H2) is being considered as an ideal and clean energy carrier since the utilization of hydrogen, either via combustion or via fuel cells, results in pure water. However, currently its production ... [more ▼]

Hydrogen (H2) is being considered as an ideal and clean energy carrier since the utilization of hydrogen, either via combustion or via fuel cells, results in pure water. However, currently its production relies mainly (i.e. 95%) on fossil fuels. The recent advances to produce biohydrogen from renewable sources such as biomass and particularly by fermentation of carbohydrate-rich substrates from agriculture and agro-industries appear promising. Such a process called “dark fermentation” enables both organic waste treatment and renewable energy production to be coupled. The soluble metabolites, mainly acetate and butyrate, contained in the spent medium of the dark fermentation bioreactor may be efficiently converted to methane in a second anaerobic digester treating other carbon sources. The paper reviews the state-of-the art on the challenges and prospective applications of dark fermentation as a first step of anaerobic digestion of municipal solid wastes to produce H2 and CH4. [less ▲]

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See detailThe usability of green building rating systems in hot arid climates: A case study in Siwa, Egypt
Attia, Shady ULg; Dabaieh, Marwa

in Proceedings of the 4th Biennial subtropical cities conference (2013, October)

In the last ten years there has been a proliferation of regional building rating systems across the Middle East (ME). Most those emerging rating systems and labels emulate the British and American rating ... [more ▼]

In the last ten years there has been a proliferation of regional building rating systems across the Middle East (ME). Most those emerging rating systems and labels emulate the British and American rating systems BREEAM and LEED that emerged in industrial countries context with an impact reduction paradigm. Thus they are neglecting the local historic, climatic, economic, technological, cultural and social context of the ME. This paper presents a case study of a recently constructed eco-lodge, AlBabenshal, in Siwa, Egypt, that performs beyond the existing rating systems requirements. The paper illustrates the environmental and sustainability design strategies adapted to AlBabenshal Lodge buildings’ context. In this study, the usability of existing rating systems in the ME is surveyed and their response to climate, occupants and society is evaluated. The paper presents a set of sustainability principles addressing (1) the site, (2) water, (3) energy, (4) resources, (5) comfort, (6) heritage and (7) social responsibility. In addition, the building is examined across the environmental criteria of LEED, Estidama Pearl Rating System and the Egyptian Green Pyramid Rating System (GPRS). Results showed that the building failed to comply with the three rating systems despite its sustainability and despite winning the Egyptian Hassan Fathy Award for environmental design. The paper elaborates on this conflict and presents recommendations to improve and adapt the questioned rating systems [less ▲]

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See detailRevealing Middlebox Interference with Tracebox
Detal, Grégory; Hesmans, Benjamin; Bonaventure, Olivier et al

in ACM/USENIX Internet Measurement Conference (2013, October)

Middleboxes such as firewalls, NAT, proxies, or Deep Packet Inspection play an increasingly important role in various types of IP networks, including enterprise and cellular networks. Recent studies have ... [more ▼]

Middleboxes such as firewalls, NAT, proxies, or Deep Packet Inspection play an increasingly important role in various types of IP networks, including enterprise and cellular networks. Recent studies have shed the light on their impact on real traffic and the complexity of managing them. Network operators and researchers have few tools to understand the impact of those boxes on any path. In this paper, we propose tracebox, an extension to the widely used traceroute tool, that is capable of detecting various types of middlebox interference over almost any path. tracebox sends IP packets containing TCP segments with different TTL values and analyses the packet encapsulated in the returned ICMP message. Further, as recent routers quote, in the ICMP message, the entire IP packet that they received, \tracebox is able to detect any modification performed by upstream middleboxes. In addition, tracebox can often pinpoint the network hop where the middlebox interference occurs. We evaluate tracebox with measurements performed on PlanetLab nodes. Our analysis reveals various types of middleboxes that were not expected on such an experimental testbed supposed to be connected to the Internet without any restriction. [less ▲]

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See detailAn efficient algorithm for the provision of a day-ahead modulation service by a load aggregator
Mathieu, Sébastien ULg; Ernst, Damien ULg; Louveaux, Quentin ULg

in Proceedings of the 4th European Innovative Smart Grid Technologies (ISGT) (2013, October)

This article studies a decision making problem faced by an aggregator willing to offer a load modulation service to a Transmission System Operator. This service is contracted one day ahead and consists in ... [more ▼]

This article studies a decision making problem faced by an aggregator willing to offer a load modulation service to a Transmission System Operator. This service is contracted one day ahead and consists in a load modulation option, which can be called once per day. The option specifies the range of a potential modification on the demand of the loads within a certain time interval. The specific case where the loads can be modeled by a generic tank model is considered. Under this assumption, the problem of maximizing the range of the load modulation service can be formulated as a mixed integer linear programming problem. A novel heuristic-method is proposed to solve this problem in a computationally efficient manner. This method is tested on a set of problems. The results show that this approach can be orders of magnitude faster than CPLEX without significantly degrading the solution accuracy. [less ▲]

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See detailMONITORING OF ANAEROBIC DIGESTION IN MSW LANDFILLS IN TUNISIA
Mhiri, F.; Hiligsmann, Serge ULg; Sayahi, L. et al

in Proceedings Sardinia 2013 (2013, October)

The monitoring of two controlled landfills in Tunisia was carried out for about 10 years by CITET and CWBI. Both landfills were managed by classical methodology i.e. disposal, compaction and, if any ... [more ▼]

The monitoring of two controlled landfills in Tunisia was carried out for about 10 years by CITET and CWBI. Both landfills were managed by classical methodology i.e. disposal, compaction and, if any, biogas and leachate extraction and treatment. One of them is located near Tunis and the other near Sousse with a warmer climate. They received more than 6,000 and 350 thousand cubic metre of MSW respectively from the two cities. Solid samples were collected by boring at different depths up to 18 m. They were analysed for dry weight and for total organic carbon, nitrogen and (hemi-) cellulose. The boreholes were equipped with 200 mm perforated PEHD tubes for further biogas and leachate sampling and analyses (COD, VFA, CH4 content, …) at different seasons. The results indicate an efficient mesophilic anaerobic digestion in both landfills. The high dry weight content (70 – 92%) of 13 solid samples collected in Sousse landfill contrasts however with the high leachate production in the Tunis landfill, filling about completely the majority of boreholes. The results of this monitoring confirm the trends formerly described about biological activity and environmental impact of landfills in Tunisia. Moreover a 200 L pilot-scale anaerobic digester was operated for about 3 years with solid wastes from Tunis landfill to assess the evolution of moisture content and organic matter. [less ▲]

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See detailA Rapid Procedure for Estimating the Ability of Lock Gates to Withstand Ship Collisions
Buldgen, Loïc ULg; Le Sourne, Hervé; Rigo, Philippe ULg

in Proceedings of the PIANC Smart Rivers 2013 Conference (2013, October)

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See detailInland navigation and Land use planning: A multi-criteria approach
Xhignesse, Guillaume ULg; Teller, Jacques ULg

in Rigo, Philippe; Wolters, Milou (Eds.) Proceedings of PIANC - SMART Rivers Conference 2013 (2013, October)

The present structure of harbours in the Walloon region hardly fits the needs of present logistic developments. Considering the challenges for the development of fluvial transport, the Walloon public ... [more ▼]

The present structure of harbours in the Walloon region hardly fits the needs of present logistic developments. Considering the challenges for the development of fluvial transport, the Walloon public authorities decided in 2010 to indentify potential harbour development sites along its 440 kms of waterways. A three steps approach (selection, ranking and documentation) was designed for this purpose. This paper broaches the methodology and the results of this approach. The area of sites and their availability, which were considered as most debatable during the research, are specifically discussed. [less ▲]

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See detailUn dernier Poe
Durand, Pascal ULg

in Lefrère, Jean-Jacques; Pierssens, Michel (Eds.) Alcools. Actes du XVIe colloque des Invalides (2013, October)

Evocation et analyse du rituel du « Poe Toaster » (sur la tombe originelle de Poe au cimetière de Baltimore), suivies du point de vue porté par Mallarmé sur l'esthétique du monument érigé dans ce même ... [more ▼]

Evocation et analyse du rituel du « Poe Toaster » (sur la tombe originelle de Poe au cimetière de Baltimore), suivies du point de vue porté par Mallarmé sur l'esthétique du monument érigé dans ce même cimetière, en 1875, à la mémoire de l'auteur du « Corbeau ». [less ▲]

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See detailLandslide Susceptibility, Hazard and Risk Mapping in Mailuu-Suu, Kyrgyzstan
Torgoev, Almazbek ULg; Havenith, Hans-Balder ULg

in Landslide Science and Practice (2013, October)

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See detailCertifier la compétence numérique : établissement des notes
Vandeput, Etienne ULg

in Objets et méthodes d’enseignement de la maternelle à l’université (2013, October)

The paper analyses lots of problems met when marking student's tests aiming to measure their digital skills.

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See detailPrediction of landslide susceptibility in a seismically active high mountain region using data mining methods - a study from Maily-Say, Kyrgyzstan
Braun, Anika; Fernandez-Steeger, Tomas; Havenith, Hans-Balder ULg et al

in Reicherter, Klaus; Rudersdorf, Andreas; Grützner, Christoph (Eds.) Seismic Hazard, Critical Facilities and Slow Active Faults, Proceedings (2013, October)

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See detailAn agro-economic characterization of the Niger household : case of Tahoua
Moussa dit Kalamou, Mahamadou ULg; Andres, Ludovic ULg; Rouchet, François ULg et al

in Kovacevic, Dusan (Ed.) Book of Abstracts Fourth International Scientific Symposium "AgroSym 2013" (2013, October)

Since the big drought of 1984, the department of Tahoua in the Republic of Niger is very vulnerable on structural and temporal disruptions. The food vulnerability is defined as “the analysis of coping ... [more ▼]

Since the big drought of 1984, the department of Tahoua in the Republic of Niger is very vulnerable on structural and temporal disruptions. The food vulnerability is defined as “the analysis of coping strategies and reactions faced with the structural or/and temporary shocks, if the coping strategies are not effectives, the people are in a temporary or structural situation of food vulnerability” (Andres L., Lebailly Ph., 2011a; Andres L., Lebailly Ph., 2011b; Andres L., 2012). The environment is much degraded by the wind and water erosion. Despite many opportunities to develop the rural sector, the region of Tahoua has a structural problem because the income is not very high and the major part of the population is poor. This paper analyzes the population of the region of Tahoua in function of these agro-economic characteristics. The target is to classify the population in relation to the agro-ecologic system, food system. Each class is defined and characterized by a global description of the agricultural system and the sources of income. The paper is based on a survey realized during 2010 and 2011. The investigations have interviewed 420 heads of household. The results are obtained from Excel and SPSS software. The statistical analysis is a cluster hierarchization, comparison of mean and the descriptive statistics. The results show a difference between the north (pastoral) and the south (agricultural) of the region of Tahoua. But the major constraint is the degradation of the land and the weak fertility of this land. [less ▲]

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See detailRomans et albums de jeunesse : de nouveaux « lieux de mémoire »
Delbrassine, Daniel ULg

in Milkovitch-Rioux, C.; Songoulashvili, C.; Hervouët, C. (Eds.) et al Enfants en temps de guerre et littératures de jeunesse (XXe-XXIe siècles) (2013, October)

Children novels and picture books: new places of remembrance ?

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See detailAnalysis of the distribution of landslides and landslide dams induced by the Wenchuan Earthquake
Fan, Xuanmei; van Westen, Cees J.; Havenith, Hans-Balder ULg

in Reicherter, Klaus; Rudersdorf, Andreas; Grützner, Christoph (Eds.) Seismic Hazard, Critical Facilities and Slow Active Faults, Proceedings (2013, October)

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See detailBioclimatic Design in Casablanca (Morocco): Decision Support through Building Performance Simulation
Attia, Shady ULg; Geoffrey, van Moeseke

in Proceedings of the 4th Biennial subtropical cities conference (2013, October)

In this paper, bioclimatic design strategies in Moroccan architecture have been analyzed for the city of Casablanca. The aim of this study is to enable architects to re-understand the lessons of tradition ... [more ▼]

In this paper, bioclimatic design strategies in Moroccan architecture have been analyzed for the city of Casablanca. The aim of this study is to enable architects to re-understand the lessons of tradition, because the way towards bioclimatic architecture should start by understanding vernacular architecture. The first part of the paper presents climate analysis and a set of bioclimatic principles addressing orientation, shading, thermal mass, insulation and natural ventilation as a mean for passive cooling. The second part explores the potential of implementing the Passivhaus Standard in Casablanca. Based on a validated building model, the performance of one of an apartment, satisfying the Passivhaus Standard has been determined by means of building performance simulation. The analysis evaluated different bioclimatic strategies and examined the transfer of the Passivhaus concept to hot warm climate, while ensuring thermal comfort during summer. Results showed that the studied building concept, comprising several bioclimatic design strategies can be transferred, with appropriate adaptations, also to hot climates. Finally the study developed significant recommendation that support architects with principles and strategies for bioclimatic design. [less ▲]

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See detailAre the back educational interventions effective for preventing low back pain
Demoulin, Christophe ULg; Marty, M.; Genevay, S. et al

in Abstract book of the 8th Interdisciplinary World Congress on Low Back and Pelvic Pain (2013, October)

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See detailBuried Faults in desert environments: the application of the H/V spectral ratio technique for subsurface mapping, a case study from the Ejina Basin, Inner Mongolia, China
Rudersdorf, Andreas; Havenith, Hans-Balder ULg; Reicherter, Klaus

in Reicherter, Klaus; Rudersdorf, Andreas; Grützner, Christoph (Eds.) Seismic Hazard, Critical Facilities and Slow Active Faults, Proceedings (2013, October)

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See detailDoes the surgical treatment for lumbar radiculopathy fulfil patients preoperative expectations?
Demoulin, Christophe ULg; Lakaye, M.; Martin, Didier ULg et al

in Abstract book of the 8th Interdisciplinary World Congress on Low Back and Pelvic Pain (2013, October)

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See detailImage Context Discovery from Socially Curated Contents
Kimura, Akisato; Ishiguro, Katsuhiko; Marcos Alvarez, Alejandro ULg et al

in Proceedings of the 21st ACM International Conference on Multimedia (2013, October)

This paper proposes a novel method of discovering a set of image contents sharing a specific context (attributes or implicit meaning) with the help of image collections obtained from social curation ... [more ▼]

This paper proposes a novel method of discovering a set of image contents sharing a specific context (attributes or implicit meaning) with the help of image collections obtained from social curation platforms. Socially curated contents are promising to analyze various kinds of multimedia information, since they are manually filtered and organized based on specific individual preferences, interests or perspectives. Our proposed method fully exploits the process of social curation: (1) How image contents are manually grouped together by users, and (2) how image contents are distributed in the platform. Our method reveals the fact that image contents with a specific context are naturally grouped together and every image content includes really various contexts that cannot necessarily be verbalized by texts. [less ▲]

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See detailClustering-Based Anomaly Detection in Multi-View Data
Marcos Alvarez, Alejandro ULg; Yamada, Makoto; Kimura, Akisato et al

in Proceedings of the 22nd International Conference on Information and Knowledge Management (2013, October)

This paper proposes a simple yet effective anomaly detection method for multi-view data. The proposed approach detects anomalies by comparing the neighborhoods in different views. Specifically, clustering ... [more ▼]

This paper proposes a simple yet effective anomaly detection method for multi-view data. The proposed approach detects anomalies by comparing the neighborhoods in different views. Specifically, clustering is performed separately in the different views and affinity vectors are derived for each object from the clustering results. Then, the anomalies are detected by comparing affinity vectors in the multiple views. An advantage of the proposed method over existing methods is that the tuning parameters can be determined effectively from the given data. Through experiments on synthetic and benchmark datasets, we show that the proposed method outperforms existing methods. [less ▲]

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See detailHypoxia in the Black Sea northwestern shelf: From eutrophication to climatic stressors.
Capet, Arthur ULg; Beckers, Jean-Marie ULg; Grégoire, Marilaure ULg

in 40th CIESM congress proceedings (2013, October)

Abstract The dynamics of seasonal hypoxia, which affects the Black Sea north-western shelf since the mid 1970's until present days, is investigated by means of a 3D biogeochemical model. Comparison of the ... [more ▼]

Abstract The dynamics of seasonal hypoxia, which affects the Black Sea north-western shelf since the mid 1970's until present days, is investigated by means of a 3D biogeochemical model. Comparison of the model results with in -situ data reveals that the phenomenon may have been underestimated after the mid 1990's due to the distribution of observations. We investigate the mechanism of hypoxia at seasonal scale, and identify the main drivers of its interannual variability. While high nutrients discharge caused severe hypoxia in the 1980's, it was sustained in the 1990's by the pool of organic matter accumulated during the previous years in the sediments layer. With an increasing intensity, climatic stressors intensifies the response of hypoxia to nutrient discharge, and affect the seasonal dynamics of hypoxia by extending its temporal scale. [less ▲]

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See detailSmall-angle, high-contrast exoplanet imaging with the L-band AGPM vector vortex coronagraph now offered at the VLT
Mawet, Dimitri; Absil, Olivier ULg; Milli, Julien et al

in Shaklan, Stuart (Ed.) Techniques and Instrumentation for Detection of Exoplanets VI (2013, September 26)

In November 2012, we installed an L-band annular groove phase mask (AGPM) vector vortex coronagraph (VVC) inside NACO, the adaptive optics camera of ESO's Very Large Telescope. The mask, made out of ... [more ▼]

In November 2012, we installed an L-band annular groove phase mask (AGPM) vector vortex coronagraph (VVC) inside NACO, the adaptive optics camera of ESO's Very Large Telescope. The mask, made out of diamond subwavelength gratings has been commissioned, science qualified, and is now offered to the community. Here we report ground-breaking on-sky performance levels in terms of contrast, inner working angle, and discovery space. This new practical demonstration of the VVC, coming a few years after Palomar's and recent record-breaking lab experiments in the visible (E. Serabyn et al. 2013, these proceedings), shows once again that this new-generation coronagraph has reached a high level of maturity. [less ▲]

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See detailEmpty Container Management in the Benelux Waterways
Salmon, Frédéric ULg; Limbourg, Sabine ULg

in Pianic Smart Rivers 213 (2013, September 25)

The scientific contribution of this paper is the development of a model for empty container management in the hinterlands of the ports of Antwerp and Rotterdam. The objective of the proposed model is to ... [more ▼]

The scientific contribution of this paper is the development of a model for empty container management in the hinterlands of the ports of Antwerp and Rotterdam. The objective of the proposed model is to minimize the total operational cost while satisfying the demand for empty containers. This goal is achieved by choosing the most efficient transportation mode between a seaport and its hinterland: road, inland waterways or intermodal transport. Moreover, to fit the real-life operation and management as well as possible, our model also includes container substitution and container leasing options. [less ▲]

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See detailSPATIODATA, une approche alternative pour la gestion des données spatialisées relatives aux bâtiments
Carré, Cyril ULg; Delfosse, Vincent ULg; Billen, Roland ULg et al

in Thibaud; Gourmelon; Gensel, Jérôme (Eds.) et al SAGEO 2013 - Conférence internationale de Géomatique et d'analyse spatiale - ACTES de la Conférence (2013, September 25)

There are an increasing number of mobile applications supporting specific activities related to the indoor building environment. SpatioData is a research project aiming at the development of a ... [more ▼]

There are an increasing number of mobile applications supporting specific activities related to the indoor building environment. SpatioData is a research project aiming at the development of a collaborative platform for the effective sharing of building-related data and supporting a wide range of different activities. After presenting the initial requirements of the system, this paper provides a review of the standards for the building modeling and the commercial solutions currently available. Then, it describes the SpatioData building model, as well as the general system architecture. [less ▲]

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See detailImproved District Heating Network Operation by the Integration of High Temperature Heat Pumps
Sartor, Kevin ULg; Lemort, Vincent ULg; Dewallef, Pierre ULg

in Digital proceedings of the 8th Conference on Sustainable Development of Energy, Water and Environment Systems - SDEWES (2013, September 23)

Biomass Combined Heat and Power (CHP) plants connected to district heating networks are a very good opportunity to increase the share of renewable sources into energy systems. Frequently, important ... [more ▼]

Biomass Combined Heat and Power (CHP) plants connected to district heating networks are a very good opportunity to increase the share of renewable sources into energy systems. Frequently, important consumers are connected to ensure a stable base demand of heat throughout the year but they often have higher requirements in terms of temperature (i.e., steam) which involves high level of temperatures in the district heating network during the whole year and high levels of heat losses in the network. This contribution presents the possibility to decrease the level of temperature at which the district heating network operates and to use high temperature heat pumps connected locally at the consumption point to produce steam when needed. An investigation of the global design and integration through thermodynamic simulation models is realized for the University of Liège district heating network. This study is intended to determine the heat pump coefficient of performance and, therefore, to assess the balance between the savings in terms of heat losses and the additional heat pump electricity consumption. [less ▲]

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See detailPredictive microbiology combined with metagenomic analysis targeted on the 16S rDNA : A new approach for food quality
Delhalle, Laurent ULg; Taminiau, Bernard ULg; Ellouze, Mariem et al

in Ellouze, Mariem; Tenenhaus-Aziza, Fanny (Eds.) Proceedings of thge 8th International Conference on predictive microbiology in foods (ICPMF8) (2013, September 18)

OBJECTIVES The food spoilage process is mainly caused by alteration micro-organisms and classical culture-based methods have therefore been used to assess the microbiological quality of food. These ... [more ▼]

OBJECTIVES The food spoilage process is mainly caused by alteration micro-organisms and classical culture-based methods have therefore been used to assess the microbiological quality of food. These techniques are simple to implement but may not be relevant to understand the modifications of the microbial ecology which occur in the food product in response to different changes in the environmental conditions. Metagenomic analysis targeted on 16S ribosomal DNA can bring about a solution to this new need and elucidate microbial community structures, including the identification and quantification of culturable and non-culturable organisms, at a much higher resolution than was previously possible with culture-based methods to provide a picture of the microbial community. Combined with predictive microbiological models, a new approach was investigated to take into account the dynamics of the evolutions of the microbial community in food products. This work describes the application of a metagenomic analysis and predictive microbiology in order to study bacterial populations dynamics in perishable foods under different environmental conditions. METHODS White pudding samples, a typical Belgian pork meat product, were packed under food wrap (atmospheric air condition). Durability studies were conducted at 4°C, 12°C and a dynamic temperature profile according to the NF V01-003 standards (4°C (1/3 of the shelf life) - 8°C (2/3 of the shelf life)) during 15 days. The effect of organic acids was also investigated using a lactic acid / diacetic acid mix (1.8% w/w) treatment. At each day of the trials, classical microbiological (total flora, lactic acid bacteria) and 16S rDNA metagenomic analysis were carried out on all these samples. For the metagenomic analysis, a sequencing library was generated, targeting the V1-V3 region of the 16S rDNA. Libraries were sequenced on a GS junior sequencer using Titanium technology. The Bio- informatic pipeline using Mothur, Blast and Stamp was used to assign a taxonomical identity to the sequences and to obtain the bacterial population proportions of the samples (Schloss, Westcott et al. 2009). The major bacterial populations were thus identified and predictive microbiology models (Baranyi and Roberts 1994; Augustin, Zuliani et al. 2005) were used to assess the growth parameters. The model was validated using the data obtained at a dynamic temperature profile. RESULTS The metagenomic analysis of the samples shows that the bacterial populations from the day 0 sample to the post-shelf life sample have important modifications. Brochothrix and Psychrobacter were identified as the dominant flora. As expected, the storage temperature had a strong impact on the  bacterial evolutions. Moreover, the use of lactic acid/diacetic acid reveals the sensitivity of the different populations to the treatment. For the storage at 4°C, the initial dominance of Pseudomonas and Shewanella is slightly reduced during storage until shelf life, after which it drops to be replaced by Brochothrix and Psychrobacter. The addition of the preservation treatment has a statistical negative impact on the Psychrobacter and Acinetobacter populations. During the ageing assay (2 days at 4°C followed by 10 days at 8°C), the analysis underlines the influence of the temperature change on the onset of the Brochothrix and Psychrobacter dominance compared to the entire 4°C storage. Again, the preservation treatment delays this onset. Finally, at an abusive 12°C temperature, samples are quickly dominated by the Psychrobacter/Brochothrix pair after 2 days of storage. In this case, the lactic acid mix does not appear to be of any effective use. Adjustment of primary model was made on the major bacterial populations and simulation was made based on estimated growth rate. The simulations of the three major populations seem to be sufficient for this food product to predict 80 -90 % of the bacterial population at the end of the shelf life in function of the environmental conditions. CONCLUSIONS AND IMPACT OF THE STUDY Compared to culture based methods on selective media and previous independent culture techniques, metagenomic analysis combined with predictive microbiology gives more valuable information, and its use could be considered as a technique for quality control or for accurately determining shelf life. REFERENCES Augustin, J. C., V. Zuliani, et al. (2005). "Growth rate and growth probability of Listeria monocytogenes in dairy, meat and seafood products in suboptimal conditions." J Appl Microbiol 99(5): 1019-­‐1042. Baranyi, J. and T. A. Roberts (1994). "A dynamic approach to predicting bacterial growth in food." International Journal of Food Microbiology 23(3-­‐4): 277-­‐294. Schloss, P. D., S. L. Westcott, et al. (2009). "Introducing mothur: open-­‐source, platform-­‐independent, community-­‐supported software for describing and comparing microbial communities." Appl. Environ. Microbiol. 75(23): 7537-­‐7541. [less ▲]

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See detailVariétés - 2. Escourgeon et orge d'hiver fourragers
Monfort, Bruno; Couvreur, Luc; Jacquemin, Guillaume et al

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc Céréales (2013, September 12)

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See detailImplantation des cultures
Eylenbosch, Damien ULg; Roisin, Christian; Monfort, Bruno et al

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc Céréales (2013, September 12)

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See detailVariétés - 1. Froment d'hiver
Meza Morales, Walter; Mahieu, O.; Heens, Benoît et al

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc céréales (2013, September 12)

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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 detail3D ERT Monitoring of the Reactivation of Waste Biodegradation with Fresh Leachate Injection
Robert, Tanguy ULg; Dumont, Gaël ULg; Pilawski, Tamara ULg 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 detailLandscape Quality Assessment: from place to utopia
Vanderheyden, Vincent ULg; Schmitz, Serge ULg

in Changing European Landscapes. Landscape ecology, local to global. Proceedings. (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 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 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 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 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 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 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 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 detailManaging acute myopathies
Votion, Dominique ULg

in In proceedings: 51th British Equine Veterinary Association (BEVA) Congress (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 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 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 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 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 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 detailInfluence of tribology of cage material on ball bearing cage instability
Servais, Christophe ULg; Duquenne, Marc ULg; Bozet, Jean-Luc ULg

in 15th European Space Mechanisms and Tribology Symposium 2013 (2013, September)

By creating a solid lubricant thickness on both bearing races, a cage material of cryogenic ball bearing plays a significant role in the good dynamical behavior of the cage. This role is essential because ... [more ▼]

By creating a solid lubricant thickness on both bearing races, a cage material of cryogenic ball bearing plays a significant role in the good dynamical behavior of the cage. This role is essential because of the lack of conventional lubricant into this kind of bearing. In this paper, a method able to identify if a particular potential cage material can correctly fulfill its function is described. In other words, if it can lead to a stable movement of the cage. From the identification of fundamental tribological parameters governing the cage behavior, this method presents an example of ranking of such materials. This is based on pin-on-disk tests and on a numerical approach. [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 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 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 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 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 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 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 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 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 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 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 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 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 detailDouble sweep preconditioner for Schwarz methods applied to the Helmholtz equation
Vion, Alexandre ULg; Geuzaine, Christophe ULg

in Proceedings of the 22nd International Conference on Domain Decomposition Methods (2013, September)

Observing that the optimized Schwarz algorithm is equivalent to the solution of a linear system, we design a new preconditioner as an approximate inverse of the iteration operator, in the particular case ... [more ▼]

Observing that the optimized Schwarz algorithm is equivalent to the solution of a linear system, we design a new preconditioner as an approximate inverse of the iteration operator, in the particular case of a layered decomposi- tion. We show that it can be rewritten as two independent sequences of subproblem solves (forward and back- ward), hence the name ‘double sweep’. The whole algorithm is implemented as a matrix-free GMRES iteration, that requires no more additional preprocessing than the original algorithm. Numerical experiments indicate that the convergence rate is independent of the wavenumber and number of subdomains when good approximations of the DtN maps are used, in both homogeneous and non-homogeneous cases. [less ▲]

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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 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 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 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 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 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 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 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 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 detailThe Airline Container Loading Problem with Pickup & Delivery and Multi Doors
Schyns, Michael ULg; Lurkin, Virginie ULg

in 53rd AGIFORS Annual Proceedings 2013: Annual Symposium and Study Group Meeting (2013, August)

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints, including the management of ... [more ▼]

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints, including the management of several doors. The originality of our approach is to allow multi-trips with pickup and delivery at some intermediate locations. The objective is to minimize the economic and environmental costs including the impact of the intermediate operations. We resort to an integer linear model. Numerical experiments have been performed using a standard B&C library. The cost impact is measured. The Airline Group of the International Federation of Operational Research Societies, composed of professionals and academics, has awarded us the price of the "Best technical presentation" for this work. [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 ▲]

Detailed reference viewed: 37 (11 ULg)