References of "Scientific congresses and symposiums"
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See detailStrychnine poisoning still happens in 2015
DEVILLE, Marine ULg; Lemaire, Eric ULg; DENOOZ, Raphael ULg et al

Conference (2016, August 29)

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See detailA hidden Markov model to estimate inbreeding from whole genome sequence data
Druet, Tom ULg; Gautier, Mathieu

Conference (2016, August 29)

Inbreeding results from the mating of related individuals and has negative consequence because it brings together deleterious variants in one individual. Inbreeding is associated with recessive diseases ... [more ▼]

Inbreeding results from the mating of related individuals and has negative consequence because it brings together deleterious variants in one individual. Inbreeding is associated with recessive diseases and reduced production or fitness. Until recently inbreeding was estimated with genealogical data, which have some limitations. Genomic estimates of inbreeding can now be obtained thanks to new technologies. Methods based on genomic relationships assume either that identical-by-state markers are identical-by-descent (IBD) or correct for the allele frequencies estimated in a « founder generation ». Similarly, with runs of homozygosity (ROH), the hypothesis is that stretches of homozygous markers longer than a determined threshold (measured in number of markers or in Mb) are IBD. Although sequencing data are more informative, most of the recent studies used genotyping data. Due to high genotyping errors rates with sequencing technologies, ROH are difficult to use on such data. We herein describe an original method to model inbreeding along chromosomes. It relies on a hidden Markov model that determines locally whether a segment is inbred and gives a measure of inbreeding's age. The method uses a function modeling the probability to observe a genotype in an inbred segments. It is well suited for sequencing data because the function incorporates genotyping errors and uncertainty associated with low or moderate coverage. We first determine the properties of our new method with different simulation scenarii. Then, we use it to estimate inbreeding in the Belgian Blue Beef cattle population with either genotyping arrays (of various densities) or whole genome sequencing data. The estimates will be compared to those obtained with other methods (pedigree, ROH, genomic relationship). Latest results will be presented. [less ▲]

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See detailHow reliable are the models to study recent climate change ? A study of heat/cold waves and radiative fluxes trends over 1900-2010 using the model MAR in Belgium
Wyard, Coraline ULg; Fettweis, Xavier ULg; Scholzen, Chloé ULg

Poster (2016, August 29)

This research aims to assess the ability of the regional climate model MAR ("Modèle Atmosphérique Régional") to reconstruct the observed twentieth century climatology of extreme events and solar radiation ... [more ▼]

This research aims to assess the ability of the regional climate model MAR ("Modèle Atmosphérique Régional") to reconstruct the observed twentieth century climatology of extreme events and solar radiation in Belgium, as a necessary condition for reliable future projections. Simulations were performed by forcing MAR with several reanalyses: the ERA40/ERA-Interim, the ERA-20C and the NCEP/NCAR-v1. The results suggests that increasing air temperature would have generated decreasing relative humidity which would have lead to a decrease in cloudiness and an increase in solar downward radiation. This research illustrates the dependency between RCMs and their forcings. The forcing reanalyses can generate divergent trends while contrary to Global Climate Models (GCM), the reanalyses assimilate observations and are supposed to represent the same climate. [less ▲]

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See detailNormative data on teachers’ voice use in real-life situations
Schiller, Isabel ULg; Morsomme, Dominique ULg; Alcoulombre, Anaëlle et al

Conference (2016, August 25)

Background As part of their working routine, teachers use their voice for extended periods of time. To compensate for adverse acoustic conditions and background noise, they are also required to speak at ... [more ▼]

Background As part of their working routine, teachers use their voice for extended periods of time. To compensate for adverse acoustic conditions and background noise, they are also required to speak at high intensities. Since teaching is acknowledged to be vocally demanding, several studies have investigated teachers’ vocal load, that is, the stress inflicted on the larynx during vocalization, which is thought to be influenced by duration, intensity and frequency of phonation. A promising method for analyzing teachers’ phonatory behavior in real-life situations is the use of a portable voice dosimeter that objectively documents vocal parameters. Depending on several factors, those parameters may vary within the teaching profession (Masuda et al., 1993; Morrow and Connor, 2011; Remacle, Morsomme, and Finck, 2014). With the aim of quantifying their vocal parameters and identifying the most at-risk teaching conditions, we have established a large database of French-speaking teachers. Based on this database, this study analyzed vocal loading differences with regard to gender, teaching level, and environment (professional versus extra-professional). Methods Seventy-six French-speaking teachers (15 males and 61 females) were monitored during one workweek using the Ambulatory Phonation Monitor voice dosimeter (KayPENTAX). The subjects included 21 kindergarten, 20 primary and 35 secondary school teachers. All male subjects were in the latter group. The vocal parameters analyzed were phonation time, intensity and fundamental frequency (F0). Results The statistical analysis revealed that, irrespective of gender, phonation time, F0 and intensity level were significantly higher in the professional environment than the extra-professional environment (p<.01). Among female subjects, the F0 of kindergarten teachers was significantly higher than that of primary school teachers, which in turn was higher than that of secondary school teachers (p<.01). The phonation time and intensity were also higher in female kindergarten teachers than other female teachers, but this difference did not reach significance. As expected, regarding gender differences, we found that female secondary school teachers spoke with significantly higher F0 than their male colleagues (p<.001). In the extra-professional setting, they also spoke with a significantly higher intensity (p<.05), but no such effect was found in the professional environment. Conclusion Overall, our subjects showed an increase in vocal loading parameters when they were at work compared to their free time. This confirms the results of earlier studies and demonstrates that teaching is an occupation with remarkably high vocal demands. The analysis of mean frequency showed that lower school levels were associated with higher-pitched voice. It can be assumed that kindergarten teachers adapt to the higher F0 of their young pupils and that their effort to maintain the pupils’ attention results in greater frequency variations. References Masuda, T., Ikeda, Y., Manako, H., & Komiyama, S. (1993). Analysis of vocal abuse: Fluctuations in phonation time and intensity in 4 groups of speakers. Acta Oto-Laryngologica, 113(3), 547–552. Morrow, S. L., & Connor, N. P. (2011). Comparison of voice-use profiles between elementary classroom and music teachers. Journal of Voice, 25(3), 367–372. Remacle, A., Morsomme, D., & Finck, C. (2014). Comparison of vocal loading parameters in kindergarten and elementary school teachers. Journal of Speech, Language, and Hearing Research, 57(2), 406–415. [less ▲]

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See detailSeasonal variation in human brain function
Vandewalle, Gilles ULg

Conference (2016, August 25)

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See detailHow do we understand Smart City? An Evolutionary Perspective
Crutzen, Nathalie ULg; Kummitha, Rama

Conference (2016, August 25)

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See detailSocial Comparison and Gender Differences in Professional Expectations
Dupont, Virginie ULg

Conference (2016, August 24)

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See detailThe influence of background noise on vocal loading parameters in music theory teachers
Schiller, Isabel ULg; Morsomme, Dominique ULg; Sfez, Lou et al

Poster (2016, August 23)

Background: Music theory teachers, who teach rhythm, singing and other music-related skills and topics, depend greatly on a well-functioning voice. Unlike other schoolteachers, who primarily use their ... [more ▼]

Background: Music theory teachers, who teach rhythm, singing and other music-related skills and topics, depend greatly on a well-functioning voice. Unlike other schoolteachers, who primarily use their voice as a pedagogic tool, music theory teachers also use it as an instrument. Furthermore, they often engage in vocally demanding free-time activities requiring a singing voice. To date, few studies have specifically looked at the voice use of music theory teachers. This study aims (1) to measure the background noise level and the amount of vocal loading affecting this specific population, and (2) to describe the influence of background noise on vocal loading parameters. Methods: Thirteen French-speaking music theory teachers (9 females and 4 males) working in a music school were monitored for one workweek, using the VoxLog voice dosimeter (Sonvox). To investigate the professional and extra-professional environments, all subjects wore the dosimeter from early morning until the end of the day. The parameters analysed were background noise level, duration of phonation, sound pressure level (SPL) and fundamental frequency (F0) of voice. Results: Overall, the mean background noise level was 75.2 dB (SD=5.4). We measured higher background noise level at work (mean=78.2 dB, SD=5.8) than in the extra-professional environment (mean=72.2 dB, SD=5.2). As expected, a rise in background noise was accompanied by a significant rise in voice SPL in both males and females (r=.61, p<.001). A significant correlation between background noise and F0 was found in females (r=.41, p=.002), but not in males (r=.39, p=.055). Furthermore, our data exhibit a significant correlation between background noise and duration of phonation (r=.05, p<.001). Conclusion: Our data suggest, that in class, music theory teachers must cope with background noise levels that dramatically exceed the limit of 35 dB recommended by the WHO (Inserm, 2006). High background noise levels lead to an increase in voice SPL, a phenomenon known as the Lombard effect (Inserm, 2006). In female subjects, we also observed a rise in F0 further to high background noise. Like Ternström, Södersten, and Bohman’s (2002) study, our data indicate that high background noise levels increase the duration of phonation. In a noisy environment, subjects seem to prolong the voiced segments of speech to make themselves understood. In other words, high background noise levels result in higher vocal loading. In the long run, this may increase the risk of voice disorders such as hyperfunctional dysphonia or vocal fold pathologies consecutive to repeated microtrauma in music theory teachers. [less ▲]

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See detailLa santé psycho-sociale des adolescents à l’épreuve de l’immigration : le cas des jeunes d’origine marocaine et turque en Belgique.
Gavray, Claire ULg

Conference (2016, August 23)

Cette communication s’appuie sur les analyses effectuées au départ des données belges de l’enquête ‘International Study on Self-reported Delinquency’. Nous investiguons la question du mal-être ... [more ▼]

Cette communication s’appuie sur les analyses effectuées au départ des données belges de l’enquête ‘International Study on Self-reported Delinquency’. Nous investiguons la question du mal-être psychologique desadolescents autochtones et allochtones (via échelle réduite de dépression des adolescents de Moos) encomparaison et en lien avec leur contexte social, affectif et relationnel. Nous affinons l’analyse en ce qui concerne les jeunes d’origine turque et marocaine vivant en Belgique, sachant que si les deux sous-groupes nationaux partagent de nombreuses expériences dans leurs relations aux différentes sphères sociales, leur groupe d’origine se caractérise aussi par des stratégies économiques et d’insertion qui peuvent différer. Nous discutons le résultat selon lequel, malgré un contexte social et historique plus favorable, les jeunes d’origine belge manifestent une tendance dépressive plus prononcée que les autres et la conclusion selon laquelle ce n’est pas automatiquement et exactement les mêmes facteurs socio-relationnels qui expliquent le niveau de dépression dans chacun des groupes étudiés. [less ▲]

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See detailOccurrence rates of invasive plants in limestone quarries (Southern Belgium)
Pitz, Carline ULg; Jorion, Alexis ULg; Mahy, Grégory ULg et al

Conference (2016, August 23)

In quarries, invasive plant species can slow down the installation of high conservation value vegetation. Successful management of invasive requires, at first, a quantitative assessment of invasion levels ... [more ▼]

In quarries, invasive plant species can slow down the installation of high conservation value vegetation. Successful management of invasive requires, at first, a quantitative assessment of invasion levels. Although European legislation has adopted an ambitious strategy against invasive species, there is still a lack of knowledge about their occurrence in quarries. The aim of this study was to evaluate occurrence rates of invasive plant species in limestone quarries throughout Wallonia (Southern Belgium) and identify high priority and emerging invasive plants for adapted management. During 2016 vegetation period, forty quarries were selected by stratified sampling, using abandoned and active quarries as strata. Within selected quarries, two-meter wide transects were established to cross all activity sectors. Transects were divided in 10x2m plots, resulting in 2% of total surface of each quarry being surveyed. Cover and number of individuals of invasive plants species were recorded in each plot. Species considered were those of Harmonia list (67 species), the reference at the Wallonia scale. More than 30 000 plots were surveyed. Results of our recent study are presented (occurrences rates by species, mean percentage cover per site). First results indicate that dominant invasive species originate from different introduction paths: (i) planted (Robinia pseudoacacia); (ii) ornamentals (Cotoneaster horizontalis) and (iii) spontaneous colonization (Senecio inaequidens) - and follow various invasion dynamics. We propose research and management methods to be directed towards limitation of top ten frequent species (e.g. Buddleia davidii, Senecio inaequidens), and to establish a detection system for the emerging invasive plants. [less ▲]

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See detailOverhanging Constraints in Addivitive Manufacturing Using Two Different Tools
Bauduin, Simon ULg; Collet, Maxime ULg; Duysinx, Pierre ULg

Poster (2016, August 23)

Topology optimization is widely used as a design tool for advanced application in mechanical, aerospace and automotive industries. This technique offers an optimal distribution of a predetermined amount ... [more ▼]

Topology optimization is widely used as a design tool for advanced application in mechanical, aerospace and automotive industries. This technique offers an optimal distribution of a predetermined amount of material in a given design space. In the last years, a lot of efforts has been invested into the development of high performance methods such as homogenization, SIMP or BESO. However as the state of the art in manufacturing experiences evolution, a coupling between topology optimization and additive manufacturing is needed. Additive manufacturing has numerous advantages that fits the characteristics of topology optimized designs. It can manufacture highly complex design without high cost increase and furthermore continuous density material of the SIMP method could be manufactured by lattice structures. With all the opportunities given by the additive manufacturing the urge to bind the last one to topology optimization is heavily required. Specific constraints related to manufacturing issues have to be taken into account such as the need of supports structures to ensure a good heat evacuation during the manufacturing process, as well as to hold up overhanging section. Some researches have been done to try to include this constraint in the optimization problem such as Leary and al or Andrew T. Gaynor. However this work focuses on 2 different methods (projection scheme and mechanical approach) to tackle the overhanging problem and compare them . [less ▲]

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See detail) Inviolate areas to protect reference sites for future microbiology research in Antarctica
Wilmotte, Annick ULg; Willems, Anne; Verleyen, Elie et al

Conference (2016, August 22)

Antarctica is a continent dominated by microbes. A surprisingly large biodiversity of well-adapted microorganisms live permanently in a variety of habitats, ranging from ice-free to permanently frozen ... [more ▼]

Antarctica is a continent dominated by microbes. A surprisingly large biodiversity of well-adapted microorganisms live permanently in a variety of habitats, ranging from ice-free to permanently frozen areas. Recent studies revealed that some microbial groups exhibit biogeographic patterns, include endemic taxa and have survived in refugia since the formation of the continental ice sheet. Microbial habitats are under constant pressure due to anthropogenic activities which may introduce non-indigenous microorganisms, via bodies, clothing, cargo and food. New ‘entry points‘ for microbial contamination are a consequence of the increase and diversification of tourism and research stations. Climatic changes might furthermore increase the probability of the successful establishment of populations of non-native taxa. The impacts of such introductions are still unknown, and might lead to a loss of the native microbial biodiversity, or its modification, which in turn might affect ecosystem functioning. The recent technical progress in molecular methodologies have generated very sensitive high-throughput analyses and have the potential to describe microbial communities with unprecedented detail. However, we may be losing the pristine Antarctic areas that would enable scientists to study the native microbial flora, its functions and properties. The Protocol on Environmental Protection of the Antarctic Treaty foresees the designation of Antarctic Specially Protected Areas (ASPA) to protect “outstanding environmental, scientific, historic, aesthetic, or wilderness values, any combination of those values, or on-going or planned scientific research” (http://www.ats.aq/e/ep_protected.htm). However, the designation of ASPAs has not followed a systematic planning, and often focused on the conservation of large mammals, birds and/or vegetation and other iconic species. Microorganisms have the handicap of generally being invisible without a microscope and relevant expertise, and require molecular methods for species delineation. Terrestrial habitats are protected in 55 out of the 72 existing ASPAs (in total less than 700 km2). Microalgae are protected in 16 ASPAs, cyanobacteria in 7 and snow microalgae in 3. Only 8 ASPAs mention ‘Microbial habitats’, ‘microbial communities’ or ‘soil and lake microflora’. One tool of the Protocol that could be specifically used to protect microbial habitats is the creation of inviolate areas where a special entry permit is required (inside ASPAs, for example), and quarantine equipment should be worn. These zones could be set aside for future research and after a few decades, they would be unique examples of truly pristine habitats, and representative of the native microbial diversity. Examples of this are ASPA 126, Byers Peninsula, and ASPA 172, Lower Taylor Glacier and Blood Falls. Such an option would require discussions and a consensus among scientists of other disciplines than microbiology to select these regions, and develop careful management protocols of the sites and their vicinity. In addition, gaps in our knowledge should be addressed, like the extent of transportation of microorganisms by natural means (winds, birds...), and the probability of subsequent colonization of new areas by microorganisms coming from other Antarctic regions or from outside Antarctica. Let’s hope that the dialogue between scientists and policy makers will improve the conservation of Antarctic microbial diversity and safeguard the possibility to study these unique communities in the future by the next generation of scientists, with the most advanced techniques of the time. [less ▲]

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See detailPassive Linearization of Nonlinear System Resonances
Habib, Giuseppe ULg; Grappasonni, Chiara ULg; Kerschen, Gaëtan ULg

Conference (2016, August 22)

In this work we demonstrate that the addition of properly-tuned nonlinearities to a nonlinear system can increase the range over which a specific resonance responds linearly. Specifically, we seek to ... [more ▼]

In this work we demonstrate that the addition of properly-tuned nonlinearities to a nonlinear system can increase the range over which a specific resonance responds linearly. Specifically, we seek to enforce two important properties of linear systems, namely the force-displacement proportionality and the invariance of resonance frequencies. Theoretical findings are validated through numerical simulations and experiments. [less ▲]

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See detailDesign of microstructures using stress-based topology optimization
Collet, Maxime ULg; Bruggi, Matteo; Noël, Lise ULg et al

Conference (2016, August 22)

This paper aims at designing microstructures using stress-based topology optimization. Most of the developments so far have been made for compliance design in various field of applications as reflected in ... [more ▼]

This paper aims at designing microstructures using stress-based topology optimization. Most of the developments so far have been made for compliance design in various field of applications as reflected in the literature. The emergence of the new additive manufacturing techniques allows to consider porous material, such as lattice structures for instance, which ca be used for the design of structural components subject to various solicitations. Those components must account for the stress level to prevent failure everywhere in the microstructures and by extension the whole structure itself. This work proposes to design such microstructures using topology optimization with limitation on the stress level within the microstructures before printing the result. The homogenization technique is used to determine the equivalent material properties. The issues and perspectives are also discussed. [less ▲]

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See detailOne pot synthesis by plasma treatment of Pt-based catalysts for PEM fuel cells
Busby, Yan; Gulas, Michal; Laurent-Brocq, Mathilde et al

Conference (2016, August 22)

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See detailIs the observer effect significant in vegetation assessment of restored metallicolous grassland?
Boisson, Sylvain ULg; Mahy, Grégory ULg

Conference (2016, August 22)

Projects that prospects habitat restoration require protocols of vegetation assessment to monitor the evolution of the restored ecosystems over time. In most cases, multiple assessors are needed and some ... [more ▼]

Projects that prospects habitat restoration require protocols of vegetation assessment to monitor the evolution of the restored ecosystems over time. In most cases, multiple assessors are needed and some studies have shown that the variability among observer can be significant. In the context of tropical grassland, few studies quantified the impact of the observer on the results, reducing the capacity to replicate conclusions, and, therefore to plan restoration strategies at large scale. This study aims to quantify the variation among observers using two phytosociological methods on restored metallicolous grassland and to test whether variation in the assessment could involve the conclusions of the vegetation assessment. Four observers were selected to perform monitoring of quadrats in two distinct habitats identified in four restored ecosystems. All observers sampled seven metrics based on phytosociological methods and two of them also performed a complete vegetation sampling of the quadrat, including species identification and cover in quadrat. For metrics based on cover, variation of measure exists among the observers. For metrics based on counting, no variation is highlighted and the observers are able to distinguish and identify species. These results emphasize that a same method could lead to distinct results according to observer and, in restoration projects, it is crucial to ensure a correct transfer of protocols of vegetation assessment in order to reproduce equally the method. [less ▲]

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See detailLes enquêtes de terrain du Musée de la Vie wallonne : Un outil au service de la collecte de la mémoire, des savoirs et savoir-faire régionaux
Postula, Jean-Louis ULg

Conference (2016, August 19)

Débutées dans les années 1920, la réalisation de reportages sur le terrain puis la diffusion régulière des résultats de ces recherches ont été pendant longtemps l’un des traits distinctifs de la fonction ... [more ▼]

Débutées dans les années 1920, la réalisation de reportages sur le terrain puis la diffusion régulière des résultats de ces recherches ont été pendant longtemps l’un des traits distinctifs de la fonction scientifique mise en œuvre au Musée de la Vie wallonne. Jusqu’à la fin des années 1980 environ, les activités du Service des enquêtes ont permis au Musée de devenir le conservatoire d’une collection unique en son genre de documents d’archives multimédia – photographies, films et sons. La rénovation du Musée à partir de 2004, assortie de la réorientation de son projet muséal vers le modèle du « musée de société », a été l’occasion d’investir à nouveau du temps et des moyens dans la relance de cette riche tradition d’enquêtes ethnographiques. Grâce à de nombreux exemples, cette communication ambitionne de montrer l’évolution des terrains d’enquêtes du Musée, qui privilégie désormais l’exploration de nouvelles thématiques liées aux enjeux contemporains de nos sociétés urbaines, industrielles et post-industrielles. Oscillant entre continuité et renouvellement, les enquêtes du Musée de la Vie wallonne permettent à l’institution de se profiler comme un contributeur influent à la préservation du patrimoine culturel immatériel de notre région. [less ▲]

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See detailAspects fonciers de l'exil des religieux français en Belgique (1901-1914)
Murez, Jean-Baptiste ULg

Conference (2016, August 19)

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See detailLe projet EpistolART à la lumière de certaines lettres évoquant Léonard de Vinci
Delfosse, Annick ULg; Fagnart, Laure ULg

Conference (2016, August 19)

Le projet EpistolART – dont nous sommes co-promotrices, avec Paola Moreno et Dominique Allart – explore le matériau épistolaire artistique de la première modernité. Dans ce cadre, le "Carteggio inedito ... [more ▼]

Le projet EpistolART – dont nous sommes co-promotrices, avec Paola Moreno et Dominique Allart – explore le matériau épistolaire artistique de la première modernité. Dans ce cadre, le "Carteggio inedito d’artisti dei secoli XIV, XV, XVI" que Johann Wilhelm Gaye a publié en 1839-1840 constitue l’un de nos corpus privilégiés. Méritoire, le travail de Gaye n’en demeure pas moins dépassé : aussi l’équipe EpistolART a-t-elle entrepris d'éditer à nouveaux frais ce corpus, en suivant les critères de la philologie, de la codicologie et de la paléographie moderne, et de reverser cette édition dans une base de données en ligne. Durant notre intervention, nous voudrions d’abord vous présenter la base de données EpistolART (travail éditorial, heuristique, conception de la base de données) puis nous arrêter sur quelques lettres évoquant Léonard de Vinci dont les membres du projet EpistolART proposent une nouvelle édition. Ces missives constituent des documents extrêmement précieux pour écrire l’histoire des relations entre le maître florentin et la France, spécialement avec le roi Louis XII, qui appelle l’artiste à son service en 1506. Si les historiens qui se sont penchés sur la vie et l’œuvre de Léonard de Vinci connaissent ces correspondances, rares sont ceux qui ont recouru aux documents épistolaires originaux. Or, ce n’est qu’au départ d’un texte sûr, appréhendé tant dans sa matérialité que dans ses contenus, que peuvent se déployer des analyses scientifiquement fondées. [less ▲]

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See detailEditing Thomas More’s Utopia (Louvain, T. Martinus, 1516): an example of Erasmian networks in action
Adam, Renaud ULg

Conference (2016, August 19)

Theodoricus Martinus Alostensis published the editio princeps of Thomas More’s Utopia at the end of the year 1516 in Louvain. Why did the English humanist give his text to this printer and not to someone ... [more ▼]

Theodoricus Martinus Alostensis published the editio princeps of Thomas More’s Utopia at the end of the year 1516 in Louvain. Why did the English humanist give his text to this printer and not to someone like Johann Froben in Basel or Jodocus Badius Ascensius in Paris? In fact, Thomas More didn’t choose Theodoricus Martinus randomly, but had been guided by his friend Erasmus, who was living in Brabant at that time and was working directly with this printer. The humanist from Rotterdam then instructed his circle to monitor closely the printing of the text, to do the proofreading and to direct the publishing. He involved in this process his friend Petrus Aegidius – clerk of city of Antwerp and close friend of both More and Erasmus – and Gerardus Geldenhower. By studying the correspondence of Erasmus, we will first rebuild the process of printing the first edition of the Utopia. This will also be an opportunity to discover the role and the importance of a network of humanists within the workshop of a printer. Without this, Theodoricus Martinus would never have been able to build his identity as a “printer humanist” and to transform his workshop into one of the leading places for the diffusion of humanism in the Low Countries in the first decades of the 16th century. [less ▲]

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See detailAggiornamento historiographique sur Godefroid Kurth (XIXème siècle-2016)
Genin, Vincent ULg

Conference (2016, August 19)

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See detailA Comparison between four Techniques to Measure Cardiac Output
Pironet, Antoine ULg; Dauby, Pierre ULg; Chase, J. Geoffrey et al

Poster (2016, August 17)

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See detailA Comparison between four Techniques to Measure Cardiac Output
Pironet, Antoine ULg; Dauby, Pierre ULg; Chase, J. Geoffrey et al

in Proceedings of the 38th International Conference of the IEEE Engineering in Medicine and Biology Society (2016, August 17)

Cardiac output is an important variable when monitoring hemodynamic status. In particular, changes in cardiac output represent the goal of several circulatory management therapies. Unfortunately, cardiac ... [more ▼]

Cardiac output is an important variable when monitoring hemodynamic status. In particular, changes in cardiac output represent the goal of several circulatory management therapies. Unfortunately, cardiac output is very difficult to estimate, either in experimental or clinical settings. The goal of this work is to compare four techniques to measure cardiac output: pressure-volume catheter, aortic flow probe, thermodilution, and the PiCCO monitor. These four techniques were simultaneously used during experiments of fluid and endotoxin administration on 7 pigs. Findings show that, first, each individual technique is precise, with a relative coefficient of repeatability lower than 7 %. Second, 1 cardiac output estimate provided by any technique relates poorly to the estimates from the other 3, even if there is only small bias between the techniques. Third, changes in cardiac output detected by one technique are only detected by the others in 62 to 100 % of cases. This study confirms the difficulty of obtaining a reliable clinical cardiac output measurement. Therefore, several measurements using different techniques should be performed, if possible, and all such should be treated with caution. [less ▲]

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See detailCASTLE4D : The castle of Franchimont
Luczfalvy Jancsó, Andrea ULg; Hoffsummer, Patrick ULg; Billen, Roland ULg et al

Poster (2016, August 16)

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See detailBackground subtraction and background generation
Van Droogenbroeck, Marc ULg

Conference (2016, August 15)

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See detailDynamic Capability Link with Firm Performance: Evidence from a Vietnamese IT Company
Dao, Trung Kien; Nguyen, Thi Thanh Hai; Tapanainen, Tommi ULg et al

in Proceedings of the Americas Conference on Information Systems (AMCIS) (2016, August 13)

Dynamic capabilities are particularly important for companies in the information technology (IT) industry. A large amount of work has been done to define capabilities, but less effort has been invested in ... [more ▼]

Dynamic capabilities are particularly important for companies in the information technology (IT) industry. A large amount of work has been done to define capabilities, but less effort has been invested in examining the interlinkages of these capabilities, or their relative importance in different market situations. These two areas are crucial, because the very nature of dynamic capabilities is in the changes that they cause to other capabilities in the company in adapting to market movements. Our paper reports the results of a survey on a Vietnamese ICT company that addresses this twin gap, and shows how the dynamic capability of innovation capability is linked to the firm performance when working together with other capabilities and resources different markets. The results also have practical implications that are described at the end of the paper. [less ▲]

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See detailPreliminary optical design for the common fore optics of METIS
Agócs, Tibor; Brandl, Bernhard R.; Jager, Rieks et al

in Evans, C.; Simard, L.; Takami, H. (Eds.) Ground-based and Airborne Instrumentation for Astronomy VI (2016, August 09)

METIS is the Mid-infrared E-ELT Imager and Spectrograph, which will provide outstanding observing capabilities, focusing on high angular and spectral resolution. It consists of two diffraction-limited ... [more ▼]

METIS is the Mid-infrared E-ELT Imager and Spectrograph, which will provide outstanding observing capabilities, focusing on high angular and spectral resolution. It consists of two diffraction-limited imagers operating in the LM and NQ bands respectively and an IFU fed diffraction-limited high-resolution (R=100,000) LM band spectrograph. These science subsystems are preceded by the common fore optics (CFO), which provides the following essential functionalities: calibration, chopping, image de-rotation, thermal background and stray light reduction. We show the evolution of the CFO optical design from the conceptual design to the preliminary optical design, detail the optimization steps and discuss the necessary trade-offs. [less ▲]

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See detailConception of a near-IR spectrometer for ground-based observations of massive stars
Kintziger, Christian ULg; Desselle, Richard ULg; Loicq, Jerôme ULg et al

in Proc. SPIE Volume 9908 Ground-based and Airborne Instrumentation for Astronomy VI (2016, August 09)

In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument that intends to observe massive stars. Starting from the derivation of theoretical relationships ... [more ▼]

In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument that intends to observe massive stars. Starting from the derivation of theoretical relationships from the scientific requirements and telescope characteristics, the entire optical design of the spectrograph is presented. Specific optical elements, such as a toroidal lens, are introduced to improve the instrument’s performances. Then, the verification of predicted optical performances is investigated through optical analyses such as resolution checking. Eventually, the star positioning system onto the central fiber core is explained. [less ▲]

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See detailHigh-contrast imaging with METIS
Kenworthy, Matthew A.; Absil, Olivier ULg; Agócs, Tibor et al

in Evans, C.; Simard, L.; Takami, H. (Eds.) Ground-based and Airborne Instrumentation for Astronomy VI (2016, August 09)

The Mid-infrared E-ELT Imager and Spectrograph (METIS) for the European Extremely Large Telescope (E-ELT) consists of diffraction-limited imagers that cover 3 to 14 microns with medium resolution (R 5000 ... [more ▼]

The Mid-infrared E-ELT Imager and Spectrograph (METIS) for the European Extremely Large Telescope (E-ELT) consists of diffraction-limited imagers that cover 3 to 14 microns with medium resolution (R 5000) long slit spectroscopy, and an integral field spectrograph for high spectral resolution spectroscopy (R 100,000) over the L and M bands. One of the science cases that METIS addresses is the characterization of faint circumstellar material and exoplanet companions through imaging and spectroscopy. We present our approach for high contrast imaging with METIS, covering diffraction suppression with coronagraphs, the removal of slowly changing optical aberrations with focal plane wavefront sensing, interferometric imaging with sparse aperture masks, and observing strategies for both the imagers and IFU image slicers. [less ▲]

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See detailInvestigating the Effect of Plant Root Exudates and of Saponin on Polycyclic Aromatic Hydrocarbons Solubilization in Brownfield Contaminated Soils
Davin, Marie ULg; Fauconnier, Marie-Laure ULg; Colinet, Gilles ULg

Conference (2016, August 08)

In Wallonia, there are 6,000 estimated brownfields (rising to over 3.5 million in Europe) that require remediation. Polycyclic Aromatic Hydrocarbons (PAHs) are a class of recalcitrant carcinogenic ... [more ▼]

In Wallonia, there are 6,000 estimated brownfields (rising to over 3.5 million in Europe) that require remediation. Polycyclic Aromatic Hydrocarbons (PAHs) are a class of recalcitrant carcinogenic/mutagenic organic compounds of major concern as they accumulate in the environment and represent 17% of all encountered pollutants. As an alternative to environmentally aggressive, expensive and often disruptive soil remediation strategies, a lot of research has been directed to developing techniques targeting organic pollutants. The following experiment, based on the observation that PAHs soil content decreases in the presence of plants, aimed at improving our understanding of the underlying mechanisms involved in phytoremediation. It focusses on plant root exudates and whether they improve PAHs solubilization, which would make them more available for bioremediation by soil microorganisms. The effect of saponin, a natural surfactant found in some plant roots such as members of the Fabaceae family, on PAHs solubilization was also investigated as part of the implementation of the experimental protocol. The experiments were conducted on soil collected from a brownfield in Saint-Ghislain (Belgium) and presenting weathered PAHs contamination. Samples of soil were extracted with different solutions containing either plant root exudates or commercial saponin. Extracted PAHs were determined in the different aqueous solutions using High-Performance Liquid Chromatography and Fluorimetric Detection (HPLC-FLD). Both root exudates of alfalfa (Medicago sativa L.) or red clover (Trifoliumpratense L.) and commercial saponin were tested in different concentrations. Distilled water was used as a control. First of all, results show that PAHs are more extracted using saponin solutions than distilled water and that the amounts generally rise with the saponin concentration. However, the amount of each extracted compound diminishes as its molecular weight rises. Also, it appears that passed a certain surfactant concentration, PAHs are less extracted. This suggests that saponin might be investigated as a washing agent in polluted soil remediation techniques, either for ex situ or in situ treatments, as an alternative to synthetic surfactants. On the other hand, preliminary results on experiments using plant root exudates also show differences in PAHs solubilization compared to the control solution. Further results will allow discussion as to whether or not there are differences according to the exudates provenance and concentrations. [less ▲]

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See detailMEASUREMENT OF MOISTURE DIFFUSIVITY BY INVESTIGATION OF SORPTION ISOTHERM AND MODELING MOISTURE TRANSFER OF MORTAR SUBMITED TO CONVECTIVE DRYING
Kahlerras, Loubna ULg; BELHAMRI, Azeddine; Fraikin, Laurent ULg et al

in Proceedings of The 20th International Drying Symposium (IDS 2016) (2016, August 08)

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes ... [more ▼]

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes. The first experimental campaign was a convective dryer; in the purpose to obtain the drying curves of mortar and the influence of water to cement ratios (W/C) on drying kinetics. A second experimental campaign aims to characterize from textural and hydric point of view, the materials, by mean of DVS (dynamic vapor sorption) In order to obtain sorption cycles and identify the moisture diffusivity coefficient of mortar. The pore size distribution is obtained from sorption cycles and completed by MIP. The contribution of each components of the microstructure to the diffusion is studied. Finally X-ray microtomography is used to measuring the moisture content in the internal structure of mortars during drying. [less ▲]

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See detailAlternative electron transport to oxygen in green microalgae during induction and steady-state photosynthesis
Franck, Fabrice ULg; de Marchin, Thomas; Fratamico, Anthony ULg et al

Conference (2016, August 06)

In this study, we used combined fluorescence-based electron transport and oxygen measurements during steady-state photosynthesis to evaluate the responses to low and high CO2 in Chlamydomonas reinhardtii ... [more ▼]

In this study, we used combined fluorescence-based electron transport and oxygen measurements during steady-state photosynthesis to evaluate the responses to low and high CO2 in Chlamydomonas reinhardtii grown in photobioreactors at different light intensities. We present a method to quantify alternative electron transport to O2 from the relationship between the apparent quantum yields of oxygen evolution and of electron transport at PSII while taking into account the variations in the proportion of energy absorbed by PSII. We used this approach to evidence a significant O2-dependent alternative electron transport in low CO2 cells. We showed that this alternative electron transport represented up to 60% of the total electron transport in low CO2 cells even when the CO2 limitation had been removed by bicarbonate addition. In contrast, no significant alternative electron transport was detected in high CO2 cells. We also analysed alternative electron transport to O2 and its relationship with the fluorescence induction process during photosynthetic induction after dark-adaptation in several microalgal species. We show that a distinct sub-phase of the fluorescence decline after the fast OJIP rise is caused by alternative electron transport to O2 and is dependent on the pre-acclimatation of the cells to different CO2 supply conditions. The involvement of mitorespiration, chlororespiration and FLV proteins in alternative electron transport to O2 is discussed on the basis of results obtained with mutants, inhibitors and FLV protein expression. [less ▲]

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See detailLes limites de la papyrologie : papyrologie et enseignement universitaire
Marganne, Marie-Hélène ULg

Conference (2016, August 05)

Which dangers is Papyrology exposed to? How to overcome these obstacles? Assets. Disadvantages. Ideas for Solutions.

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See detailOn the effect of microstructural anisotropy on the mechanical and thermophysical properties of Ti6Al4V processed by Laser Beam Melting
Mertens, Anne ULg; Paydas, Hakan ULg; Rigo, Olivier et al

Conference (2016, August 05)

Laser beam melting (LBM) is a strongly directional process in which a metallic powder is deposited layer by layer in a powder bed and molten locally according to the desired shape. When processing Ti6Al4V ... [more ▼]

Laser beam melting (LBM) is a strongly directional process in which a metallic powder is deposited layer by layer in a powder bed and molten locally according to the desired shape. When processing Ti6Al4V, it is well known that the latest layer tends to solidify epitaxially on the previous layers, thus giving rise to elongated columnar primary β(BCC) crystals extending over several successive layers. These primary β grains then transforms into the α(HCP) structure upon cooling. The present work aimed at studying the microstructural anisotropy of LBM Ti6Al4V, as well as its consequences on the mechanical and thermophysical properties (i.e. thermal expansion and thermal conductivity). In order to gain a deeper undestanding of thermal phenomena in the LBM of Ti6Al4V, great care was also taken to characterize the thermophysical properties over a wide temperature range from room temperature. [less ▲]

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See detailTechniques et Méthodes nucléaires : Application de la Spectrométrie Gamma au Cameroun
Moyo N., Maurice; Kayo, Steve; Ngelem M., Eric J. et al

Poster (2016, August 04)

L’imaginaire populaire est de plus en plus pessimiste au sujet du mot nucléaire, utilisées selon eux, uniquement pour détruire, en cas de guerre. Une idée reçue, mais presque imposée par l'attitude des ... [more ▼]

L’imaginaire populaire est de plus en plus pessimiste au sujet du mot nucléaire, utilisées selon eux, uniquement pour détruire, en cas de guerre. Une idée reçue, mais presque imposée par l'attitude des pays développés qui donnent l'impression de recourir au nucléaire, le plus souvent, à des fins militaires. Pourtant, les applications du nucléaire sont utiles dans des domaines aussi variés que l'agriculture, la médecine, la détection des fuites dans les barrages, la surveillance de la qualité de l'air, des eaux, des sols, des matériaux de construction, des denrées alimentaires etc. Au Cameroun, l'utilisation des rayonnements ionisants (énergie nucléaire) est en pleine croissance. Ce, spécifiquement dans les domaines médical et industriel. La radioprotection est de plus en plus l’objet des recherches et des mesures au Cameroun. Des techniques d’analyse nucléaires sont également utilisées pour déterminer les risques radiologiques lies aux rayonnements naturels provenant de l’environnement. Dans ce cadre, l’unité de recherche « Physique Fondamentale » de l’université de Douala en collaboration avec l’ANRP (Agence Nationale de RadioProtection) utilise la spectrométrie gamma pour quantifier et qualifier l’exposition des camerounais aux rayonnements. Deux mémoires de master ont à cette occasion révéler le niveau d’exposition due aux rayonnements provenant du sol de l’Université de Douala d’une part et d’autre part l’exposition due aux matériaux de construction dans la ville de Douala. Les études sur les matériaux de construction (ciment utilisé dans la ville de Douala) ont permis d’observer que l’activité spécifique dans les échantillons de ciment varie d’un radionucléide à l’autre. L’estimation des paramètres radiologiques comme (l’activité du radium équivalent Raeq, l’indice du risque externe (Hex) et interne (Hin), le taux de dose absorbée dans l’air et la dose effective annuelle (AEDE) ont montré que l’utilisation comme matériaux de construction du ciment analysé était sans risque particulier. [less ▲]

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See detailMaking high-accuracy null depth measurements for the LBTI exozodi survey
Mennesson, Bertrand; Defrere, Denis ULg; Nowak, Matthias et al

in Malbet, F.; Creech-Eakman, M.; Tuthill, P. (Eds.) Optical and Infrared Interferometry and Imaging V (2016, August 04)

The characterization of exozodiacal light emission is both important for the understanding of planetary systems evolution and for the preparation of future space missions aiming to characterize low mass ... [more ▼]

The characterization of exozodiacal light emission is both important for the understanding of planetary systems evolution and for the preparation of future space missions aiming to characterize low mass planets in the habitable zone of nearby main sequence stars. The Large Binocular Telescope Interferometer (LBTI) exozodi survey aims at providing a ten-fold improvement over current state of the art, measuring dust emission levels down to a typical accuracy of 12 zodis per star, for a representative ensemble of 30+ high priority targets. Such measurements promise to yield a final accuracy of about 2 zodis on the median exozodi level of the targets sample. Reaching a 1 σ measurement uncertainty of 12 zodis per star corresponds to measuring interferometric cancellation ("null") levels, i.e visibilities at the few 100 ppm uncertainty level. We discuss here the challenges posed by making such high accuracy mid-infrared visibility measurements from the ground and present the methodology we developed for achieving current best levels of 500 ppm or so. We also discuss current limitations and plans for enhanced exozodi observations over the next few years at LBTI. [less ▲]

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See detailThe path to interferometry in space
Rinehart, S. A.; Savini, G.; Holland, W. et al

in Malbet, F.; Creech-Eakman, M.; Tuthill, P. (Eds.) Optical and Infrared Interferometry and Imaging V (2016, August 04)

For over two decades, astronomers have considered the possibilities for interferometry in space. The first of these missions was the Space Interferometry Mission (SIM), but that was followed by missions ... [more ▼]

For over two decades, astronomers have considered the possibilities for interferometry in space. The first of these missions was the Space Interferometry Mission (SIM), but that was followed by missions for studying exoplanets (e.g Terrestrial Planet Finder, Darwin), and then far-infrared interferometers (e.g. the Space Infrared Interferometric Telescope, the Far-Infrared Interferometer). Unfortunately, following the cancellation of SIM, the future for space-based interferometry has been in doubt, and the interferometric community needs to reevaluate the path forward. While interferometers have strong potential for scientific discovery, there are technological developments still needed, and continued maturation of techniques is important for advocacy to the broader astronomical community. We review the status of several concepts for space-based interferometry, and look for possible synergies between missions oriented towards different science goals. [less ▲]

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See detailPlaying RPG Maker? Amateur Game Design and Video Gaming
Hurel, Pierre-Yves ULg

Conference (2016, August 04)

Game creation tools like Game Maker or RPG Maker democratize game making and facilitate the development of amateur game design. The best known among these programs have dynamic web-communities with active ... [more ▼]

Game creation tools like Game Maker or RPG Maker democratize game making and facilitate the development of amateur game design. The best known among these programs have dynamic web-communities with active members making thousands of games. However, as of now, there is little research on amateur game design except for modding or education fields. In this paper I argue that approaching amateur game making in these relations with video game playing allows a better understanding of game creation tools’ users. To support my argument, I will lean on the early results of the exploratory step of my ongoing research. [less ▲]

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See detailLes rouleaux composites répertoriés dans le Catalogue des papyrus littéraires grecs et latins du CEDOPAL
Marganne, Marie-Hélène ULg

Conference (2016, August 04)

Les rouleaux littéraires composites préfigurent-ils les codices miscellanei tels que définis par Edoardo Crisci (Segno e Testo, 2, 2004, pp. 109-144) ? Après avoir examiné les quelques exemplaires ... [more ▼]

Les rouleaux littéraires composites préfigurent-ils les codices miscellanei tels que définis par Edoardo Crisci (Segno e Testo, 2, 2004, pp. 109-144) ? Après avoir examiné les quelques exemplaires répertoriés dans le Catalogue des papyrus littéraires grecs et latins du CEDOPAL (http://cipl93.philo.ulg.ac.be/Cedopal/MP3/dbsearch.aspx), leur nature, leur présentation et l'organisation de leur contenu, on s'est interrogé sur leur contexte de production et d'utilisation en vue de répondre à cette question. [less ▲]

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See detailINVESTIGATION OF 238U, 235U, 137CS AND 133XE IN SOILS FROM THE UNIVERSITY OF DOUALA-CAMEROON
Ndontchueng Moyo, Maurice; Guembou Shouop, Cébastien Joel ULg; Ngelem Mekontso, Eric Jilbert et al

Conference (2016, August 04)

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See detailETUDE DE FAISABILITE DU PROJET D’ECLAIRAGE PUBLIC PAR DES LAMPADAIRES SOLAIRES DU CAMPUS 2 DE L’UNIVERSITE DE DOUALA
Koagne Nkuate, Michael; Guembou Shouop, Cébastien Joel ULg; Djaowe, Samuel

Conference (2016, August 04)

Dans le cadre de sa politique énergétique et de promotion des énergies renouvelables, le Gouvernement Camerounais, à travers le Ministère de l’Eau et de l’Energie (MINEE), a fait appel à l’expertise des ... [more ▼]

Dans le cadre de sa politique énergétique et de promotion des énergies renouvelables, le Gouvernement Camerounais, à travers le Ministère de l’Eau et de l’Energie (MINEE), a fait appel à l’expertise des sociétés « Chinoise et vietnamienne (HUAWEI), en vue de le soutenir dans le programme du développement de son potentiel énergétique. Pourtant, un certain nombre d’entreprises locales (SINTEC 3D, K&M ENGINEERING, TECHNO CAMER …) s’intéressent de plus en plus à la valorisation et à la vulgarisation des énergies renouvelables. Pour ce faire, nous avons pensé à la proposition du savoir-faire, de la disponibilité locale d’une main d’œuvre qualifiée en matière d’électrification par énergie solaire. Ceci a l’endroit des institutions, des bailleurs de fond, des ONG ainsi qu’aux autorités étatiques Camerounaises. Nous avons ainsi travaillé sur des thèmes tels que : Modèle d’électrification rurale pour localités de moins de 1000 habitants l’extrême nord Cameroun ; méthode simple de calcul et de choix des équipements solaires pour une application domestique ; ainsi que sur le thème étude de faisabilité du projet d’éclairage public par des lampadaires solaires au campus 2 de l’université de douala. C’est ainsi qu’une mission d’étude s’est rendue au sein du Campus en janvier 2016. Les détails de cette mission sont présentés dans les annexes ci-jointes. Plusieurs objectifs sont lies à cette etude: éclairer les espaces (au sein du Campus 2 de l’université de Douala) allant de l’amphi Stanislas Melonné jusqu'à la faculté des sciences passant par l’ENSET et par l’amphi George Gango par des lampadaires solaires. Le projet permettra d’accroitre la disponibilité et la sécurité de l’approvisionnement en énergie tout en valorisant et en vulgarisant les énergies renouvelables (devenu de plus en plus incontournables). Ce projet a également pour but de promouvoir les nouvelles technologies pour un développement durable du Cameroun (programme mondial des énergies propres) et de faire valoir les ressources naturelles et humaines disponibles (soleil en permanence, jeunes ingénieurs de l’ISS,…). [less ▲]

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See detailP.Oxy. 2401 and the History of Terence's Text
Nocchi Macedo, Gabriel ULg

Conference (2016, August 04)

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See detailFrom practice-based game research to game design as a cultural technique
Werning, Stefan; Kamp, Michiel; De Smale, Stephanie et al

Conference (2016, August 02)

Panel : de Smale, Stephanie: Game Essays in the Digital Humanities : The paper addresses the use of prototyping for creating game essays, the applicability of game essays within a digital humanities ... [more ▼]

Panel : de Smale, Stephanie: Game Essays in the Digital Humanities : The paper addresses the use of prototyping for creating game essays, the applicability of game essays within a digital humanities framework and the challenges and opportunities of taking a research-centric rather than a player-centric perspective on game design. Kamp, Michiel: Parameters of Musical Interaction in Games : The paper proposes exploring game music by experimenting with the ways in which the soundtrack responds to game states and player interaction beyond adapting analytical techniques borrowed from film music studies, like masking or replacing parts of the soundtrack. Hurel, Pierre-Yves: Amateur Game Design as Reflexive Practice : The paper presents an ethnographic perspective on amateur game design with a particular focus on the use of distinct tools such as RPG Maker and their affordances for reflective practice. Werning, Stefan: From Analytical Play to Analytical Game Design : The paper outlines the transition from intrinsically analytical aspects in (meta-)ludic practices (speed-running, in-game photography, cosplaying, let’s playing etc.) to game design as a cultural technique, i.e. a mode of expression and civic engagement in a gamified society. [less ▲]

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See detailEnabling the direct detection of earth-sized exoplanets with the LBTI HOSTS project: a progress report
Danchi, W.; Bailey, V.; Bryden, G. et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2016, August 01)

NASA has funded a project called the Hunt for Observable Signatures of Terrestrial Systems (HOSTS) to survey nearby solar type stars to determine the amount of warm zodiacal dust in their habitable zones ... [more ▼]

NASA has funded a project called the Hunt for Observable Signatures of Terrestrial Systems (HOSTS) to survey nearby solar type stars to determine the amount of warm zodiacal dust in their habitable zones. The goal is not only to determine the luminosity distribution function but also to know which individual stars have the least amount of zodiacal dust. It is important to have this information for future missions that directly image exoplanets as this dust is the main source of astrophysical noise for them. The HOSTS project utilizes the Large Binocular Telescope Interferometer (LBTI), which consists of two 8.4-m apertures separated by a 14.4-m baseline on Mt. Graham, Arizona. The LBTI operates in a nulling mode in the mid-infrared spectral window (8-13 μm), in which light from the two telescopes is coherently combined with a 180 degree phase shift between them, producing a dark fringe at the location of the target star. In doing so the starlight is greatly reduced, increasing the contrast, analogous to a coronagraph operating at shorter wavelengths. The LBTI is a unique instrument, having only three warm reflections before the starlight reaches cold mirrors, giving it the best photometric sensitivity of any interferometer operating in the mid-infrared. It also has a superb Adaptive Optics (AO) system giving it Strehl ratios greater than 98% at 10 μm. In 2014 into early 2015 LBTI was undergoing commissioning. The HOSTS project team passed its Operational Readiness Review (ORR) in April 2015. The team recently published papers on the target sample, modeling of the nulled disk images, and initial results such as the detection of warm dust around η Corvi. Recently a paper was published on the data pipeline and on-sky performance. An additional paper is in preparation on β Leo. We will discuss the scientific and programmatic context for the LBTI project, and we will report recent progress, new results, and plans for the science verification phase that started in February 2016, and for the survey. [less ▲]

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See detailThe Athena X-ray Integral Field Unit (X-IFU)
Barret, Didier; Trong, Thien Lam; den Herder, Jan-Willem et al

in Proc. SPIE. 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99052F. (August 17, 2016) (2016, August 01)

The X-ray Integral Field Unit (X-IFU) on board the Advanced Telescope for High-ENergy Astrophysics (Athena) will provide spatially resolved high-resolution X-ray spectroscopy from 0.2 to 12 keV, with 5 ... [more ▼]

The X-ray Integral Field Unit (X-IFU) on board the Advanced Telescope for High-ENergy Astrophysics (Athena) will provide spatially resolved high-resolution X-ray spectroscopy from 0.2 to 12 keV, with 5 arc second pixels over a field of view of 5 arc minute equivalent diameter and a spectral resolution of 2.5 eV up to 7 keV. In this paper, we first review the core scientific objectives of Athena, driving the main performance parameters of the X-IFU, namely the spectral resolution, the field of view, the effective area, the count rate capabilities, the instrumental background. We also illustrate the breakthrough potential of the X-IFU for some observatory science goals. Then we briefly describe the X-IFU design as defined at the time of the mission consolidation review concluded in May 2016, and report on its predicted performance. Finally, we discuss some options to improve the instrument performance while not increasing its complexity and resource demands (e.g. count rate capability, spectral resolution). The X-IFU will be provided by an international consortium led by France, The Netherlands and Italy, with further ESA member state contributions from Belgium, Finland, Germany, Poland, Spain, Switzerland and two international partners from the United States and Japan. [less ▲]

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See detailDetection of nitrogen stress on winter wheat by multispectral machine vision
Marlier, Guillaume ULg; Gritten, Fanny; Leemans, Vincent ULg et al

Conference (2016, August 01)

Hand-held sensors (SPAD meter, N-Tester, …) used for detecting the leaves nitrogen concentration (Nc) present several drawbacks. The nitrogen concentration is gained by an indirect way through the ... [more ▼]

Hand-held sensors (SPAD meter, N-Tester, …) used for detecting the leaves nitrogen concentration (Nc) present several drawbacks. The nitrogen concentration is gained by an indirect way through the chlorophyll concentration and the leaves have to be fixed in a defined position for the measurements. These drawbacks could be overcome by an imaging device that measures the canopy reflectance. Hence, the objective of the paper is to analyse the potential of multispectral imaging for detecting nitrogen concentration. The tests were carried out on parcels submitted to nitrogen inputs varying from 0 to 180 kg N.ha-1. Reference Nc measurements were obtained by the Kjeldahl method and a Hydro N-Tester (Yara). The developed imaging system comprised a CMOS camera and a set of 22 interference filters ranging from 450 to 950 nm mounted on a wheel steered by a stepper motor. The image acquisition and the motor rotation were controlled by a program written in C++. The crop was imaged vertically at one meter height. The raw images presented 1280×1024 pixels covering an area of approximately 0.25 m² and were recorded with a 12-bit luminance resolution. To deal with the natural irradiance variability of the scene, a white reference was used and the integration time was automatically adjusted for each image. The image treatment included the segmentation of Photosynthetically Active Leaves (PAL) by using Bayes theorem and the computation of the mean PAL reflectance after correction of background and illumination fluctuations. Nc was estimated on the basis of the 22 filters by the Partial Least Square (PLS) method and by four filters selected by the Best Subset Selection (BSS) method. In comparison with the Kjeldahl method, the estimation of Nc by means of the Hydro N-Tester, the PLS method and the BSS method (filters 600-80, 950-100, 650-40 and 450-80 nm) gave determination coefficients equal to 0.53, 0.63, and 0.62, respectively. This indicated that the full multi-spectral approach gave significantly better Nc estimation than a portable device and suggested that a camera equipped with four filters would give similar results. [less ▲]

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See detailOverview of LBTI: a multipurpose facility for high spatial resolution observations
Hinz, P. M.; Defrere, Denis ULg; Skemer, A. et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2016, August 01)

The Large Binocular Telescope Interferometer (LBTI) is a high spatial resolution instrument developed for coherent imaging and nulling interferometry using the 14.4 m baseline of the 2×8.4 m LBT. The ... [more ▼]

The Large Binocular Telescope Interferometer (LBTI) is a high spatial resolution instrument developed for coherent imaging and nulling interferometry using the 14.4 m baseline of the 2×8.4 m LBT. The unique telescope design, comprising of the dual apertures on a common elevation-azimuth mount, enables a broad use of observing modes. The full system is comprised of dual adaptive optics systems, a near-infrared phasing camera, a 1-5 μm camera (called LMIRCam), and an 8-13 μm camera (called NOMIC). The key program for LBTI is the Hunt for Observable Signatures of Terrestrial planetary Systems (HOSTS), a survey using nulling interferometry to constrain the typical brightness from exozodiacal dust around nearby stars. Additional observations focus on the detection and characterization of giant planets in the thermal infrared, high spatial resolution imaging of complex scenes such as Jupiter's moon, Io, planets forming in transition disks, and the structure of active Galactic Nuclei (AGN). Several instrumental upgrades are currently underway to improve and expand the capabilities of LBTI. These include: Improving the performance and limiting magnitude of the parallel adaptive optics systems; quadrupling the field of view of LMIRcam (increasing to 20"x20"); adding an integral field spectrometry mode; and implementing a new algorithm for path length correction that accounts for dispersion due to atmospheric water vapor. We present the current architecture and performance of LBTI, as well as an overview of the upgrades. [less ▲]

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See detailHeart Team Session
PIERARD, Luc ULg; LANCELLOTTI, Patrizio ULg; PETERMANS, Jean ULg et al

Conference (2016, August)

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See detailModelling of multibody systems in the local frame
Bruls, Olivier ULg; Sonneville, Valentin

in Proceedings of the 24th International Congress of Theoretical and Applied Mechanics (ICTAM) (2016, August)

A local frame finite element approach is proposed to describe the kinematics of a flexible multibody system, derive the equations of motion and solve them numerically. It is argued that this approach ... [more ▼]

A local frame finite element approach is proposed to describe the kinematics of a flexible multibody system, derive the equations of motion and solve them numerically. It is argued that this approach leads to reduced geometric nonlinearities and improved computational efficiency. [less ▲]

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See detailLa légation des Pays-Bas en cour de Rome au temps de l’agent Laurent du Blioul (1573-1598): Une légation au cœur des réseaux de la monarchie de Philippe II
Regibeau, Julien ULg

in Actes du neuvième congrès de l'Association des Cercles francophones d'Histoire et d'Archéologie de Belgique (2016, August)

Detailed reference viewed: 52 (24 ULg)
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See detailLa parentalité dans un contexte de violence conjugale : support de résilience ?
Glowacz, Fabienne ULg

Conference (2016, August)

L’accès à la parentalité, quels que soient le contexte social ou conjugal et l’histoire de la femme, s’avère une étape-clé de transition dans la trajectoire personnelle. Le fonctionnement parental est ... [more ▼]

L’accès à la parentalité, quels que soient le contexte social ou conjugal et l’histoire de la femme, s’avère une étape-clé de transition dans la trajectoire personnelle. Le fonctionnement parental est influencé par trois types de facteurs interagissant entre eux : la personnalité du parent (elle-même influencée par son histoire développementale), les caractéristiques individuelles de l'enfant et les sources de soutien et de stress de l'environnement (Belsky,1984).Les recherches sur la parentalité et la résilience se sont principalement centrées sur la résilience des enfants ayant vécu des traumatismes tels que les abus sexuels, où la résilience est activée par la disponibilité et le soutien parental ( Glowacz et Buzitu, 2014). Nos récentes études portant sur les trajectoires de femmes ayant vécu des traumatismes majeurs (violences conjugales, violences de guerre) nous conduisent à considérer l’accès à la parentalité comme un turning point, déclencheur d’un processus de résilience de ces femmes. Des analyses cliniques seront mises en perspective avec des données de recherches ayant évalué le sentiment de compétence parentale (incluant le sentiment d’efficacité et le sentiment de satisfaction), le stress parental et le soutien social perçu de femmes ayant vécu ces traumatismes. Nos observations et résultats nous amènent à questionner la résilience de la mère et les résonances de cette résilience sur l’enfant en développement. [less ▲]

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See detailSarcoptic mange infection in red foxes (Vulpes vulpes) in Belgium
Volpe, Rosario ULg; Caron, Yannick ULg; Lesenfants, Christophe ULg et al

Poster (2016, August)

Eight cases of sarcoptic mange in foxes were reported during summer 2014 (n=3) and winter 2015 (n= 5) in Belgium. All animals came from the same restricted forest zones near urbanized areas and some of ... [more ▼]

Eight cases of sarcoptic mange in foxes were reported during summer 2014 (n=3) and winter 2015 (n= 5) in Belgium. All animals came from the same restricted forest zones near urbanized areas and some of them were discovered in private gardens (Forest District of Thuin, Hainaut, Belgium). Three of them were found dead, the others were shot for sanitary reasons. At necropsy, all of them presented large areas of alopecia and extensive skin lesions such as hyperkeratosis and suppurative lacerations. Animals presented poor body condition and some of them were severely emaciated (absence of visceral fat). Mange has profound influences on population since, if untreated, death follows in four to six months. In the present cases, cutaneous scrapings and histopathological examinations were systematically performed. Numerous parasites were observed in skin scrapings and marked dermo-epidermatitis with several parasites was observed in histopathological sections. These results suggest an outbreak of sarcoptic mange in red foxes in a limited area of the country. This is a first record for the country. Furthermore, investigations on lungs and digestive tracts performed on 3 of these foxes revealed they were also infected by parasites transmissible to pets and/or humans: Angiostrongylus vasorum was observed in the respiratory tract of one fox whereas Toxocara canis, Uncinaria stenocephala, Taenia spp. and Echinococcus multilocularis worms were detected in the digestive tract. In conclusion, urban foxes represent a source of parasites of public health and veterinary importance and foxes surveillance should be strengthened in these areas. [less ▲]

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See detailMicroorganisms and semiochemicals to manipulate aphidophagous predators
Verheggen, François ULg

Conference (2016, August)

Semiochemicals provide a powerful way for organisms to communicate and coordinate their behaviors. But they also represent opportunities for other organisms to intercept and exploit such signals. There ... [more ▼]

Semiochemicals provide a powerful way for organisms to communicate and coordinate their behaviors. But they also represent opportunities for other organisms to intercept and exploit such signals. There are now numerous examples of natural enemies eavesdropping the intraspecific communication of their prey to better locate them. Aphid natural enemies, including predators and parasitoids, frequently exhibit innate responses to chemical cues reliably associated with aphids, and there is also abundant evidence that learning of profitable chemical cues frequently occurs. Thenceforth, the efficiency of aphid natural enemies to locate their prey is mainly based on their ability to perceive and orientate toward aphid-associated semiochemicals. Aphid predators were shown to respond to different groups of aphid-related semiochemicals, including aphid-induced plant volatiles; aphid pheromones and the more recently identified bacteria-produced honeydew volatiles. These laboratory studies suggest potentially promising avenues for the deployment of aphid-associated semiochemicals for the management of these pest species. While laboratory experiments are invaluable tools for revealing mechanisms, additional field studies are however needed to test ecological relevance of the observed effects. Although it is now possible to attract naturally occurring aphid predators in a crop field using semiochemicals, future work should more fully explore the broader ecological context in which signaling occurs. The information gained from a deeper understanding of the chemical ecology of aphid-natural enemy interaction will enhance our understanding of the chemical biology and ecology of aphids, and may facilitate the design of novel control strategies. [less ▲]

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See detailEnhancing Cover Song Identification with Hierarchical Rank Aggregation
Osmalsky, Julien ULg; Van Droogenbroeck, Marc ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the 17th International for Music Information Retrieval Conference (2016, August)

Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features ... [more ▼]

Abstract Cover song identification involves calculating pairwise similarities between a query audio track and a database of reference tracks. While most authors make exclusively use of chroma features, recent work tends to demonstrate that combining similarity estimators based on multiple audio features increases the performance. We improve this approach by using a hierarchical rank aggregation method for combining estimators based on different features. More precisely, we first aggregate estimators based on global features such as the tempo, the duration, the loudness, the beats, and the average chroma vectors. Then, we aggregate the resulting composite estimator with four popular state-of-the-art methods based on chromas as well as timbre sequences. We further introduce a refinement step for the rank aggregation called “local Kemenization” and quantify its benefit for cover song identification. The performance of our method is evaluated on the Second Hand Song dataset. Our experiments show an significant improvement of the performance, up to an increase of more than 200 % of the number of queries identified in the Top-1, compared to previous results. [less ▲]

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See detailLearning to Dissect. The Technologies of Touch in the Renaissance
Von Hoffmann, Viktoria ULg

Conference (2016, August)

The aim of this paper is to examine the part played by the sense of touch in anatomical practices and discourses in Renaissance Italy. As dissections became widespread in the sixteenth century, a sensory ... [more ▼]

The aim of this paper is to examine the part played by the sense of touch in anatomical practices and discourses in Renaissance Italy. As dissections became widespread in the sixteenth century, a sensory approach to the inside of the dead body (anatomia sensibilis), through the anatomist’s eye and touch, was thought to be the surest way of uncovering truths about the living body. Carlino, Kusukawa, Mandressi, Park, and Sawday have convincingly emphasized the importance of sight and visual experience in the production and communication of anatomical knowledge, through the emergence of an “autoptic vision” (Sawday) and more broadly of a new “visual argument” (Kusukawa) for the early modern scientific study of Nature. Yet the practice of anatomy engages haptic as much as visual experience: when dissecting, the anatomist cuts through the skin and touches the inside of the dead body, with his scalpel and his hands, in order to enhance his knowledge of the living body. Manual skills thus became a source of insight as they helped to unveil the real state of the body’s inside. Many medical students were therefore eager not only to attend but also to perform dissections, in order to get a better grasp of the functioning of the human body. Using records from anatomical demonstrations and notes from medical students, this paper seeks to explore the technologies of touch that were displayed when medical students were learning to dissect. What was the part played by the sense of touch in educational practices, as well as in the production and communication of anatomical knowledge? How did the students cope with the disgust which would arise from the tactile contact with blood and other bodily fluids? How was the dissecting hand of the anatomist presented by students in their descriptions of anatomical lessons? What was the importance of the practitioner’s touch in the process of reading the body’s inner reality? Was the sense of touch used as a rhetorical strategy to express authority and claim expertise? In a word: did Vesalian anatomy and the new anatomy theatre involve a new relationship with touch (as well as observation, as has been argued)? Did a new ‘tactile argument’ also arise in this context? [less ▲]

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See detailObservation of the surface circulation of the Mediterranean Sea from space
Karimova, Svetlana ULg

in Ouwehand, L. (Ed.) Proc. ESA Living Planet Symposium 2016 (2016, August)

In the present work mesoscale eddies of the Western Mediterranean are being investigated by means of thermal imagery and altimetry data. Comparison of 1489 anticyclonic and 782 cyclonic eddy ... [more ▼]

In the present work mesoscale eddies of the Western Mediterranean are being investigated by means of thermal imagery and altimetry data. Comparison of 1489 anticyclonic and 782 cyclonic eddy manifestations found in sea surface temperature (SST) imagery on an analysis of a 3-year-long dataset (covering the period from 2011 to 2013) with corresponding sea level anomaly (SLA) fields showed that only anticyclonic eddies exceeding ca. 70 km in diameter can be more or less sustainably manifested in the fields of SLA and its derivatives (such as relative vorticity). Detection of cyclonic eddies on base of SLA data, presumably due to the small spatial and temporal scales of such eddies and their non-geostrophic nature, is problematic. [less ▲]

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See detailEVALUATION OF FISH EXPOSURE TO POP-LIKE (ORGANOTIN) COMPOUNDS IN SEPETIBA BAY (RIO DE JANEIRO STATE, BRAZIL) THROUGH HEPATIC TOTAL TIN CONCENTRATIONS
Paiva, TC; Schilithz, PF; Bisi, TL et al

in Organohalogen Compounds (2016, August)

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See detailCharacterization of Leptolyngbya and Phormidium diversity in Antarctic biotopes
Lara, Yannick ULg; Durieu, Benoit ULg; Borderie, Fabien et al

Poster (2016, August)

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See detailParcours migratoire et résilience : ressources et contraintes perçues par des réfugiés syriens et afghans
Vereshchagin, Anton ULg; Glowacz, Fabienne ULg

Poster (2016, August)

Les chiffres du Haut-Commissariat des Nations Unies pour les réfugiés indiquent une augmentation considérable du flux migratoire en Europe depuis 2010. Cette tendance s’explique notamment par une violence ... [more ▼]

Les chiffres du Haut-Commissariat des Nations Unies pour les réfugiés indiquent une augmentation considérable du flux migratoire en Europe depuis 2010. Cette tendance s’explique notamment par une violence persistante dans des pays tel que l’Afghanistan et l’évolution du conflit en Syrie. Dans le cadre d’une approche écosystémique, les contraintes perçues et rappelées par les sujets ayant « survécu » à la « traversée » migratoire et aux micro-traumatismes associés ont été mises en perspectives avec, les motivations liées à cette migration et les ressources perçues par les migrants. Notre étude de type exploratoire se base sur la rencontre avec 15 sujets âgés de 21 à 67 ans : 7 afghans et 8 syriens (13 hommes et 2 femmes) résidant dans des structures d'accueil pour demandeurs d'asile et hors structure, en Belgique. Des entretiens semi-structurés ont été menés en anglais et en russe et trois questionnaires ont été administrés : le locus de contrôle (1966), le sentiment d'auto-éfficacité (1997) et le soutien social perçu (1985). L'analyse des discours a mis en évidence différents types de motivations à la migration ne prédéterminant pas nécessairement la complexité du voyage qui apparait davantage dépendante des contextes situationnels, des opportunités et diverses contraintes. Par contre, les motivations semblent associées aux ressources perçues. Sur base de l’analyse du récit de la trajectoire, ainsi que des questionnaires, plusieurs facteurs de protection et de résilience ont été identifiés. Nous avons également proposé une nouvelle adaptation du modèle transthéorique de changement (DiClemente et Prochaska, 1982) au processus migratoire. [less ▲]

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See detailThe dual action of neuroestrogens on sexual behavior
Cornil, Charlotte ULg

Conference (2016, August)

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See detailInference in a stochastic SEIR model using Sequential Monte Carlo methods
Bonou, Wilfried ULg; LAMBERT, Philippe

in The 37th Annual Conference of the International Society for Clinical Biostatistics (ISCB): Book of Abstracts. Birmingham, UK, 21-25 August 2016 (2016, August)

Many biological, physical, chemical, economic, and social phenomena are dynamic and are modeled using (systems of) Ordinary Differential Equations (ODEs). But a more realistic way to describe these ... [more ▼]

Many biological, physical, chemical, economic, and social phenomena are dynamic and are modeled using (systems of) Ordinary Differential Equations (ODEs). But a more realistic way to describe these dynamics relies on Discrete Time Markov Chains (DTMC). There is a growing interest in the development of Bayesian statistical methods to infer on the parameters in such dynamic models, particularly those defining epidemic spread, by combining prior information with experimental or observational data. Our proposal aims to explore the merits of the Bayesian Optimal Filtering technique in the estimation of the parameters of a stochastic SEIR (S = Susceptible, E = Exposed, I = Infectious, R = Removed) epidemic model. State Space Models (SSMs) are used to describe the epidemic dynamic. The unknown static parameters are estimated using a combination of Sequential Monte Carlo techniques with a Markov Chain Monte Carlo algorithm, . . . [less ▲]

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See detailDiversity and distribution of microorganisms in microbial mats of Antarctic lakes
Lara, Yannick ULg; Durieu, Benoit ULg; Stelmach Pessi, Igor ULg et al

Conference (2016, August)

The BelSPO project CCAMBIO aims to study the biogeographical distribution of microorganisms in lacustrine microbial mats using a combination of techniques including microscopic observations, strain ... [more ▼]

The BelSPO project CCAMBIO aims to study the biogeographical distribution of microorganisms in lacustrine microbial mats using a combination of techniques including microscopic observations, strain isolation and genetic characterisation, and molecular diversity assessments using Next Generation Sequencing of environmental DNA. The samples were collected in different Antarctic and sub-Antarctic biogeographical regions. Preliminary multivariate analysis of >130 samples revealed strong bioregionalisation patterns in microbial eukaryotes, which are in agreement with the classical subdivision of the Antarctic Realm into Maritime Antarctica, Continental Antarctica and the Sub-Antarctic Islands generally observed in plants and animals. The biogeographic structuring was less strong between the continent and Maritime Antarctica in prokaryotes suggesting more regular dispersal events between these two regions. The Sub-Antarctic assemblages harboured more complex foodwebs, with arthropods, nematods, rotifers, flatworms and annelids as main metazoan groups. Lakes on the continent, however, were characterised by fewer metazoan groups and a greater importance of microbial herbivores and secondary consumers, including a relative high diversity of ciliates and tardigrades. In a first analysis of microbial mats from five Antarctic lakes and an aquatic biofilm from the Sub-Antarctic, the majority of the cyanobacterial OTUs retrieved were related to filamentous taxa such as Leptolyngbya and Phormidium, which are common genera in Antarctic lacustrine microbial mats. However, other phylotypes related to different taxa such as Geitlerinema, Pseudanabaena, Synechococcus, Chamaesiphon, Calothrix and Coleodesmium were also found. Results revealed a much higher diversity than what had been reported using traditional methods and also highlighted remarkable differences between the cyanobacterial communities of the studied lakes. In the coming months, the molecular diversity data will be deposited into the “Microbial Antarctic Resource System (MARS)” presently developed into the webportal ‘biodiversity.aq’. Better knowledge of the diversity and distribution of microorganisms will contribute to a better assessment of their resilience and local/regional responses to global change [less ▲]

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See detailStructural design under damage constraints with XFEM and level sets
Noël, Lise ULg; Duysinx, Pierre ULg; Maute, Kurt

Conference (2016, August)

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See detailEVALUATING THE CHEMICAL SAFETY OF EDIBLE INSECTS
Poma, G; Cuykx, M; Amato, E et al

in Organohalogen Compounds (2016, August), 78

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See detailA population approach to evaluate grassland restoration - a systematic review
Harzé, Mélanie ULg; Monty, Arnaud ULg; Boisson, Sylvain ULg et al

Conference (2016, August)

How do we know if restoration goals are achieved? In practice, the criteria used to evaluate the success of restoration actions are numerous and can be defined at different ecological scales, i.e. at the ... [more ▼]

How do we know if restoration goals are achieved? In practice, the criteria used to evaluate the success of restoration actions are numerous and can be defined at different ecological scales, i.e. at the population, community or ecosystem level. Most studies about restoration success monitoring assessed attributes corresponding to the community or ecosystem levels like species diversity, vegetation structure and ecological processes. Has the population approach been disregarded to evaluate restoration success? This systematic review of the literature aimed to identify how often plant population traits were used to monitor restoration of grasslands. Practically, 3133 papers were reviewed among which 1065 reported monitoring of plant species after a restoration action. Only 153 papers used a population approach and represent the core of this review. Detailed results and paper content will be presented with the aim to identify restoration protocols (with or without species addition), species of interest, population attributes and processes considered to evaluate restoration success. [less ▲]

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See detailOn the compatibility equations in geometrically exact beam finite element
Sonneville; Bruls, Olivier ULg; Bauchau, Olivier A.

in Proceedings of the 12th International Conference on Multibody Systems, Nonlinear Dynamics and Control (MSNDC) within the ASME/IDETC/CIE Conference (2016, August)

This paper discusses the compatibility equations which relate the velocity field and the strain field in geometrically exact beam theory. The analysis is carried out in the context of intrinsic equations ... [more ▼]

This paper discusses the compatibility equations which relate the velocity field and the strain field in geometrically exact beam theory. The analysis is carried out in the context of intrinsic equations, namely the dynamic equilibrium equations are formulated in terms of velocity and strain only. In addition to the well established objectivity and path-independence requirements of the spatial discretization, these compatibility equations show that a consistent spatial interpolation of the velocity field should depend on the curvature of the beam, including initial curvature and curvature from the deformation, and it is shown that this consistency is connected to the ability of the element to represent rigid body motion velocity. A two node interpolation scheme is studied and it appears that, as the element gets smaller under mesh refinement, the effect of this dependency reduces, leading eventually to the classical linear shape functions. [less ▲]

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See detailLe traumatisme psychologique des anesthésistes suite aux erreurs humaines : Quand les processus de résilience organisationnelle renforcent la résilience individuelle
Blavier, Adelaïde ULg; Nyssen, Anne-Sophie ULg

Conference (2016, August)

Les erreurs médicales provoquent souvent des dommages énormes, pour la victime en premier lieu bien évidemment mais aussi pour le ou les professionnel(s) impliqué(s) dans l’erreur ainsi que pour les ... [more ▼]

Les erreurs médicales provoquent souvent des dommages énormes, pour la victime en premier lieu bien évidemment mais aussi pour le ou les professionnel(s) impliqué(s) dans l’erreur ainsi que pour les institutions hospitalières. L’objectif de cette communication est d’analyser le vécu post-erreur humaine chez des anesthésistes en étudiant l’impact de l’événement sur ces médecins. Nous avons récolté 217 incidents/accidents qui se sont produits en anesthésie en milieu hospitalier avec une analyse complète de l’événement, son origine et ses conséquences pour le patient et l’anesthésiste. Nos résultats montrent que les dommages à court terme pour le patient influencent significativement le sentiment de colère contre soi-même chez l’anesthésiste. Les dommages à long terme pour le patient provoquent de la colère contre soi-même, des troubles de l’appétit et de la perte de plaisir. Plus les dommages pour le patient sont graves, plus ils provoquent de troubles chez l’anesthésiste, particulièrement quand le patient décède suite à l’erreur. En outre, les anesthésistes développent plus de ruminations, de sentiments de culpabilité et de pensées intrusives quand l'accident était considéré comme évitable. Enfin, nous notons l’importance pour les anesthésistes de pouvoir parler de l’événement dans un cadre bienveillant avec pour effet de diminuer les reviviscences et ruminations personnelles, de faire taire les rumeurs, et d’améliorer la qualité des relations entre collègues. Ainsi la gestion institutionnelle des erreurs humaines dans une perspective constructive et bienveillante est génératrice de résilience en permettant aux médecins d’apprendre de leurs erreurs et d’améliorer leur expertise professionnelle au lieu de développer une psychopathologie posttraumatique [less ▲]

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See detailInvolvement of membrane remodelling induced by fatty acids in the regulation of the NLRP3 inflammasome activity in human macrophages
Gianfrancesco, Marco ULg; Dehairs, Jonas; Bloch, Katarzyna et al

in Diabetologia (2016, August), 59(Supplement 1), 291

Detailed reference viewed: 17 (3 ULg)
See detailMicroalgae diversity along an Antarctic glacier forefield
Stelmach Pessi, Igor ULg; Rybalka, Natalia; Friedl, Thomas et al

Poster (2016, August)

Glacier retreat due to global warming has been observed in all the cryosphere [1], systematically exposing new terrestrial ecosystems that had previously been covered by ice. Primary succession, i.e. the ... [more ▼]

Glacier retreat due to global warming has been observed in all the cryosphere [1], systematically exposing new terrestrial ecosystems that had previously been covered by ice. Primary succession, i.e. the assembly of biological communities on newly exposed habitats and their change over time, can be studied along glacier forefields, where distance from the glacier terminus is used as a proxy for time since deglaciation [2]. The study of microbial succession is still at its infancy, but understanding the relationships between microbial communities and soil development will provide us with crucial knowledge on how they influence and respond to changes in environmental conditions. Here, we investigated the structure of microalgal communities along a deglaciation gradient in the forefield of Collins Glacier (Fildes Peninsula, King George Island, Maritime Antarctica). [less ▲]

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See detailL’Hadrianus de Montserrat (P.Monts.Roca III, inv.162 → - 165 ↓) : une source nouvelle sur la Colonia Claudia Ara Agrippinensium ?
Berg, Tatiana ULg

Poster (2016, August)

Sixième partie du codex miscellaneus de Montserrat (P.Monts.Roca III, inv.162 → - 165 ↓ = MP3 2998.11 = LDAB 552, papyrus, 2e moitié IVe siècle), qui présente la particularité de contenir des textes à la ... [more ▼]

Sixième partie du codex miscellaneus de Montserrat (P.Monts.Roca III, inv.162 → - 165 ↓ = MP3 2998.11 = LDAB 552, papyrus, 2e moitié IVe siècle), qui présente la particularité de contenir des textes à la fois grecs et latins, profanes et chrétiens, tous écrits par la même main, le récit latin en prose Hadrianus relate notamment le passage de l’empereur Hadrien dans la ville de Cologne, dont il évoque des realia. Après les avoir répertoriées et avoir évalué leur authenticité, le poster met en évidence l’apport du texte à la connaissance de la Colonia Claudia Ara Agrippinensium et de son autel des Ubiens. [less ▲]

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See detailThe prosumers and the grid
Gautier, Axel ULg

Conference (2016, August)

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See detailBack to the Future of Dioxin Analyses
Patterson Jr, D; Focant, Jean-François ULg

Conference (2016, August)

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See detailFeasibility study of burning neat jatropha oil into a vaporizing burner for household applications.
Sartor, Kevin ULg; Makaire, Danielle; Fontaine, Jean-Marie et al

in Proceedings (2016, August)

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See detailPhonological acquisition in CLIL- and non-CLIL education
Rasier, Laurent ULg

Conference (2016, August)

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See detailEvolution of biological innovations in early complex cells
Javaux, Emmanuelle ULg

Conference (2016, August)

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See detailHabitat use of an unstudied Lepilemur in the northwest Madagascar: L. mittermeieri
Wilmet, Leslie ULg; Vermeulen, Cédric ULg; Beudels-Jamar et al

Conference (2016, August)

Biodiversity and endemism is very high in Madagascar and Genus Lepilemur is part of the endemic mammalian fauna of the island. Sportive lemurs have small distribution ranges, fairly small total ... [more ▼]

Biodiversity and endemism is very high in Madagascar and Genus Lepilemur is part of the endemic mammalian fauna of the island. Sportive lemurs have small distribution ranges, fairly small total populations and are particularly negatively affected by deforestation and habitat fragmentation, serious threats for the biological diversity of the island. Our research focus on one poorly-known taxon, Lepilemur mittermeieri. The distribution range of this endangered species is restricted to the Ampasindava peninsula in the northwest Madagascar and ecological information is essential for its preservation. The main objective of our study is to analyze habitat use and niche characteristics of the species and the impact of habitat degradation and fragmentation on these parameters in order to design robust conservation guidelines for the Ampasindava peninsula. In this talk, we will present the project as a whole and results of two 4-months field missions conducted in 2015 and in 2016. These field missions were designed to specifically 1)compare home range size between two sites 2)complete forest characterization of the home range of several radio-collared individuals. The methodology includes the monitoring of 16animals equipped with radio-collar (VHS telemetry) during 6hours per night for a number of days, GPS locations being recorded every 10 minutes. The home range is derived from the telemetry observation through MCP method. [less ▲]

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See detailDiscrete Modeling: The Concept of Shannon Entropy used for Thermodynamic Model Development
Wallek, Thomas; Pfleger, Martin; Pfennig, Andreas ULg

Conference (2016, August)

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See detailCyanobacterial diversity in soil crusts in the Sör Rondane Mountains
Namsaraev, Zorigto; Mano, Marie-José; Wilmotte, Annick ULg

Poster (2016, August)

Antarctica is the only continent that is dominated by microbial (cyanobacteria and algae) and lower plant (predominantly mosses and lichens) communities. Cyanobacteria are photosynthetic bacteria that ... [more ▼]

Antarctica is the only continent that is dominated by microbial (cyanobacteria and algae) and lower plant (predominantly mosses and lichens) communities. Cyanobacteria are photosynthetic bacteria that require solar light, liquid water, air and some mineral nutrients for growth. They serve as primary producers of organic matter in Antarctic ecosystems providing energy to other physiological groups of microorganisms and invertebrates. Cyanobacteria form macroscopically visible crusts or thin biofilms on the surface of soils and rocks, or occupy endolithic niches in Antarctic mountains. Mountains exposed above the ice sheet could have remained ice-free during glaciation maxima in Antarctica. They could serve as a refuge for terrestrial biodiversity and potential source for recolonization of surrounding habitats during glacier retreat. Cyanobacterial diversity in habitats located above 1 km a.s.l. was studied in several Antarctic locations. These include: the Vinson Massif in Ellsworth Mountains (2000-2500 m a.s.l.), Beacon (1176 m a.s.l.) and University Valleys (1700 m a.s.l.) in the "stable upland zone" of the McMurdo Dry Valleys (Southern Victoria Land) and the Sör Rondane Mountains (1370-1700 m a.s.l.) (Yergeau et al., 2007; Wood et al., 2008; Fernandez-Carazo et al., 2012). The goal of our work was to study cyanobacterial diversity of cyanobacteria in the Sör Rondane Mountains in the vicinity of Belgian Princess Elisabeth Station. Previous estimates of the diversity showed the presence of 10 morphotypes and 13 OTUs of cyanobacteria in 10 samples of biofilms and microbial crusts (Fernandez-Carazo et al., 2012). We performed a broader sampling and studied cyanobacterial diversity using DGGE with cyanospecific primers and microscopy. In 126 samples, we observed 15 morphotypes of cyanobacteria. 28 representative samples were selected for molecular analyses that revealed the presence of 28 OTUs (groups of 16S rRNA sequences sharing at least 97,5% sequence similarity). Comparison with other mountainous areas of Antarctica showed that the Sör Rondane Mountains harbor a significantly higher cyanobacterial diversity. Molecular analysis of the cyanobacterial diversity in Beacon Valley didn't show the presence of cyanobacteria (Wood et al., 2008), though a strain of Chroococcidiopsis sp. (CCMEE 134) was isolated from a sample collected there (Billi et al., 2011). A strain of Chroococcidiopsis sp. (CCMEE 171-A789-2) was also isolated from samples collected in University Valley (Cumbers & Rothschild, 2014). 5 OTUs of cyanobacteria were detected in samples collected in Ellsworth Mountains despite of the presumably harsher climate (78°31′S latitude compared to 77°49′S for Beacon Valley) and higher altitude (Yergeau et al., 2007). No reliable climate data are available for the discussed areas, except for the Sor Rondane Mountains. We propose that the higher diversity of cyanobacteria detected near the Princess Elisabeth Station could be explained by a more intensive sampling or by a more northern location of the area (72°0′S). [less ▲]

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See detailThe BCCM/ULC collection: a Biological Ressource Center to give access to the Antarctic cyanobacterial diversity
Wilmotte, Annick ULg; Renard, Marine ULg; Lara, Yannick ULg et al

Poster (2016, August)

On the Antarctic continent, Cyanobacteria represent the key primary producers and the main drivers of the food webs in a wide range of aquatic to terrestrial habitats. For example, they build benthic ... [more ▼]

On the Antarctic continent, Cyanobacteria represent the key primary producers and the main drivers of the food webs in a wide range of aquatic to terrestrial habitats. For example, they build benthic microbial mats in lakes and soil crusts in terrestrial biotopes. They may present interesting features to survive freeze/thaw cycles, sea-sonally contrasted light intensities, high UV radiations, dessication and other stresses. The BCCM/ULC public collection funded by the Belgian Science Policy Office since 2011 aims to gather a representative portion of the polar cyanobacterial diversity with different ecological origins (limnetic microbial mats, soil crusts, cryoconites, endoliths, etc.). It makes it available for researchers to study the taxonomy, evolu-tion, adaptations to harsh environmental conditions, and genomic make-up. It pres-ently includes 226 cyanobacterial strains, with 119 being of Antarctic origin (cata-logue: http://bccm.belspo.be/catalogues/ulc-catalogue-search). The morphological identification shows that the strains belong to the orders Synechococcales, Oscillatoriales, Pleurocapsales, Chroococcidiopsidales and Nostocales. We present here the molecular datasets showing the diversity of the BCCM/ULC strains, studied on the basis of the 16S rRNA gene. A selection of strains was also characterized by sequencing of rpoC1, recA, and gyrA genes after amplification with newly designed primers. Our results mainly show that 25 OTUs included strains of Antarctic origin. Moreo-ver, strains identified as members of the genera Leptolyngbya or Phormidium ap-pear in several lineages. This supports the need to revise these polyphyletic genera with a simple filamentous morphology. A certain divergence of some Antarctic strains from related strains isolated from other regions can also be observed. It suggests that a portion of the Antarctic cyanobacterial flora may have evolved in-dependently from the cyanobacteria in other continents. [less ▲]

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Full Text
Peer Reviewed
See detailREVISITED SAMPLE PREPARATION APPROACH FOR DIOXIN MEASUREMENTS IN HUMAN SERUM SAMPLES
Calaprice, Chiara ULg; Focant, Jean-François ULg

in Organohalogen Compounds (2016, August), 78

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See detailOptimal design of flexible mechanisms using a generalized equivalent static load method
Tromme, Emmanuel; Sonneville, Valentin; Guest, James K. et al

in Proceedings of the 24th International Congress of Theoretical and Applied Mechanics (2016, August)

The equivalent static load (ESL) method is a powerful approach to solve dynamic response structural optimization problems. The method transforms the dynamic response optimization into a static response ... [more ▼]

The equivalent static load (ESL) method is a powerful approach to solve dynamic response structural optimization problems. The method transforms the dynamic response optimization into a static response optimization under multiple load cases. The ESLs are defined based on the transient analysis response whereupon all the standard techniques of static response optimization can be used. In the last decade, the ESL method has been applied to perform structural optimization of flexible components of mechanical systems modeled as multibody systems. This method considers the optimization of isolated component during the static response optimization. The present research proposes a generalized ESL method accounting for the entire system during the static response optimization, which enables to formulate the constraints with respect to the mechanism and not restricted to the individual components. The proposed method relies on a Lie group formalism which has appealing properties to derive efficiently the ESL. Examples validate the method. [less ▲]

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Peer Reviewed
See detailProofing & Reduction Strategies Used by Emergency Residents to Manage Fatigue-related Risk
Berastegui, Pierre ULg; Ghuysen, Alexandre ULg; Nyssen, Anne-Sophie ULg

Poster (2016, July 29)

Fatigue and sleep loss are typically associated with psychomotor and cognitive impairment resulting in poorer task performance. Most of these studies are conducted in controlled settings and involve the ... [more ▼]

Fatigue and sleep loss are typically associated with psychomotor and cognitive impairment resulting in poorer task performance. Most of these studies are conducted in controlled settings and involve the completion of experimental tasks. Only a few field studies involving exhausted residents have been conducted over the past decade, and they yielded to contradictory results (Ellman et al., 2004). One of the key factors that could be involved in the non-linear relationship between fatigue and performance in specific work context reside in the mobilization of Fatigue Proofing Strategies. FPS are adaptive and protective risk-reduction behaviors that improve the resilience of a system of work (Dawson et al., 2012). In this study, we aimed to identify and classify proofing strategies mobilized by EMS residents using an inductive content analysis approach. EMS residents reported a range of strategies for reducing subjective level of sleepiness (reduction strategies, n=15) or managing its consequences (proofing strategies, n=17). Content analysis yielded to three sub-categories of proofing strategies: Behavioral Compensation (n=8), Error’s Opportunity Reduction (n=5) and Error’s Consequences Mitigation (n=4). Our results show that EMS residents use both types of strategies although none of the proofing strategies were part of their training program. Despite the current informal use, there is significant potential for implementation of more formal processes. [less ▲]

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See detailGroundwater flow and transport modelling at regional scale: lessons learned from different applications in the Walloon Meuse basin
Dassargues, Alain ULg; Goderniaux, Pascal; Orban, Philippe ULg et al

Conference (2016, July 28)

An overview is proposed of the recent groundwater modelling works, at the groundwater body scale, performed by the Hydrogeology & Environmental Geology team of the University of Liège. The developed ... [more ▼]

An overview is proposed of the recent groundwater modelling works, at the groundwater body scale, performed by the Hydrogeology & Environmental Geology team of the University of Liège. The developed modelling tools are built in the general objective of improving our understanding and management, at short, middle and long terms, of the groundwater bodies. The general strategy to be followed implies that conceptualization, parameterization and calibration must be adapted to the actual objectives of each model (Wildemeersch et al., 2014). 3 specific applications are illustrated involving two main groundwater bodies: - application of the HFEMC method (Wildemeersch et al., 2010) within the SUFT3D code for groundwater flow modelling of the ‘Synclinorium of Dinant’ (Orban et al., 2010 and Brouyère et al., 2011); - application of the HFEMC method and the SUFT3D code for the nitrate trends (Batlle-Aguilar et al., 2007) simulations in the Geer basin (Orban et al., 2010) for different scenarios of nitrate inputs; - application of the HGS integrated model for assessing the impact of climate change on the groundwater reserves in the Geer basin (Brouyère et al., 2004, Goderniaux et al., 2009 and 2011) with quantification and comparison of the different uncertainty sources (Goderniaux et al., 2015) Lessons and perspectives are learned and proposed from these modelling experiences at the scale of the groundwater body. [less ▲]

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