Last 7 days     Results 1101-1120 of 42586.   51 52 53 54 55 56 57 58 59 60 61   The development of Structural Fire Engineering over the past 25 years and issues for the futureFranssen, Jean-Marc Conference (2015, October 15)This talk presents a series of thoughts of the author from his observation of the evolution of structural fire engineering since the beginning of his career Experimental research works are discussed ... [more ▼]This talk presents a series of thoughts of the author from his observation of the evolution of structural fire engineering since the beginning of his career Experimental research works are discussed, either on the behavior of materials or on the behavior of structures. The rest of the presentation is dedicated to calculation methods: tabulated data, simple calculation models and general calculation models. For numerical calculation models, the presentation contains a brief history of appearance of different software, of their objectives, of their capabilities… Some examples are presented of structures recently modelled in real applications. Possible abusive utilizations of numerical modelling are also shown. The presentation ends with a presentation of some challenges that the discipline is facing for the future. [less ▲]Detailed reference viewed: 13 (0 ULg) Mise au point sur les neuropathies héréditairesWANG, François-Charles ; BOUQUIAUX, Olivier Scientific conference (2015, October 15)Detailed reference viewed: 12 (0 ULg) Belgian International Lawyers and WWI. Networks, Experience and MemoryGenin, Vincent Poster (2015, October 15)Detailed reference viewed: 21 (3 ULg) La médecine de famille, une connaissance complexe et multi facettesJamoulle, Marc Conference (2015, October 15)Dans les conditions difficiles que doit affronter la Tunisie, soit faire face a l'augmentation de la demande en soins de santé, à l'amélioration de la qualité et à la transition démographique et ... [more ▼]Dans les conditions difficiles que doit affronter la Tunisie, soit faire face a l'augmentation de la demande en soins de santé, à l'amélioration de la qualité et à la transition démographique et épidémiologique, la Médecine de Famille représente un atout certain. L'image internationale peu flatteuse de la médecine de famille Tunisienne est présentée au travers de sa présence dans les publications scientifiques. Une série de concepts spécifiques de la Médecine de Famille sont exposés ; la complexité, l'extension de la connaissance, l'incertitude, les différents niveaux de l'action. Leur prise en compte permet d'appeler à un autre regard et à un appel à écrire le métier d'une façon différente. Pour en sortir définitivement avec l'image délétère de ce métier exigeant. [less ▲]Detailed reference viewed: 77 (11 ULg) The impact of factors related to retirement on cognitive functioningGrotz, Catherine ; Adam, Stéphane ; Matharan, Fanny et alConference (2015, October 15)Detailed reference viewed: 38 (0 ULg) Do Burundians have a more positive perception of older people than immigrants or Belgians?Marquet, Manon ; Missotten, Pierre ; Nindaba, Desiderate et alPoster (2015, October 15)Detailed reference viewed: 26 (8 ULg) Efficient standard error formulas of ability estimators in item response theoryMagis, David Conference (2015, October 15)This talk focuses on the computation of asymptotic standard errors (ASE) of ability estimators with dichotomous item response models. A general framework is considered, and ability estimators are defined ... [more ▼]This talk focuses on the computation of asymptotic standard errors (ASE) of ability estimators with dichotomous item response models. A general framework is considered, and ability estimators are defined from a very restricted set of assumptions and formulas. This approach encompasses most standard methods such as maximum likelihood, weighted likelihood, maximum a posteriori, and robust estimators. A general formula for the ASE is derived from the theory of M-estimation. Well-known results are found back as particular cases for the maximum and robust estimators, while new ASE proposals for the weighted likelihood and maximum a posteriori estimators are presented. These new formulas are compared to traditional ones by means of a simulation study under Rasch modeling. [less ▲]Detailed reference viewed: 18 (1 ULg) EFFECTS OF AGRICULTURAL PRACTICES AND HEAVY METAL CONTAMINATION ON THE COMMUNITY DYNAMICS OF EARTHWORMS IN RELATION TO SOIL PHYSICAL AND CHEMICAL FACTORS IN AGRICULTURAL FIELDS (BELGIUM)Lemtiri, Aboulkacem Doctoral thesis (2015)We investigated the effect of different agricultural practices on the abundances, biomass, and species diversity of earthworms. Specifically, we aimed to identify the relationship between certain soil ... [more ▼]We investigated the effect of different agricultural practices on the abundances, biomass, and species diversity of earthworms. Specifically, we aimed to identify the relationship between certain soil physico-chemical properties and earthworm communities in agricultural soils. Two tillage systems and crop residue management were investigated. After conducting the study over four years, we found that the abundance, biomass, and diversity of earthworms were negatively affected by tillage application and the removal of crop residues. All ecological groups were negatively affected by conventional tillage system and crop residues exportation. However, crop residues removal had a greater impact than the conventional tillage system. In this study area, the earthworm community was dominated by the endogeic species A. c. caliginosa (64%), while few epigeic and anecic species were observed (5%). Endogeic and epi-anecic (L. terrestris) species appeared to be highly influenced by tillage and of crop residues exportation. When crop residues were exported from the field, the concentrations of chemical elements were low, particularly P and K nutrients. Earthworm activity contributed to nutrient dynamics and soil structure after four years of incorporating of crop residues to the fields and reduced tillage application. No consistent relationship was detected between soil and earthworm variables, even though different soil properties responded differently with respect to the tillage systems, crop residues removal and the presence of certain earthworm species. The number of years that our field was managed might have also affected our results.On the basis of the primarily research focused on understanding how earthworms participate and contribute towards improving soil quality (structure, nutrient dynamics and fertility), we subsequently focused on investigating how two plants (Vicia faba and Zea mays) and the Eisenia fetida earthworm contribute to uptake of different metals: Cd, Zn, Pb and Cu from the land surrounding of a former Zn-Pb ore treatment plant. Specifically, we tested whether the earthworm Eisenia fetida could act as a catalyzor to enhance phytoremediation efficiency. After 42 days of exposure, our results showed that certain earthworm life-cycle traits are affected by metal contamination and by the addition of plants. Specifically, the concentrations of metals in earthworm tissues decreased in the presence of plants. Our findings demonstrate that earthworm activities modify the availability of metals in soils, enhancing metal uptake by plants. This innovative system offers new investigation possibilities by considering earthworm-plant-soil interaction. In conclusion, this work confirmed that earthworms are important catalyzor optimizing the phytoremediation processes of polluted soils. [less ▲]Detailed reference viewed: 44 (10 ULg) L’insécurité de l’exclusion sociale : comment sortir de l’impuissance ?Glowacz, Fabienne Scientific conference (2015, October 15)Detailed reference viewed: 16 (0 ULg) Figuras de traductor (no) profesionalWillson, Patricia Scientific conference (2015, October 15)Detailed reference viewed: 14 (3 ULg) Public Finance Tools Reshape the Belgian Polity: A Sociological Perspective on Public FinancePiron, Damien Poster (2015, October 15)Detailed reference viewed: 12 (0 ULg) Shear banding modelling in cross-anisotropic rocksPardoen, Benoît ; Seyedi, D.M.; Collin, Frédéric in International Journal of Solids and Structures (2015), 72Sedimentary geomaterials such as rocks frequently exhibit cross-anisotropic properties and their behaviour depends on the direction of loading with respect to their microstructure. As far as material ... [more ▼]Sedimentary geomaterials such as rocks frequently exhibit cross-anisotropic properties and their behaviour depends on the direction of loading with respect to their microstructure. As far as material rupture is concerned, localised deformation in shear band mode appears generally before cracks and material failure. The influence of cross-anisotropy on the shear strain localisation remains an important issue and is investigated in the present study. To do so, a constitutive elastoplastic cross-anisotropic model that includes anisotropy both on the elastic and plastic characteristics is defined. For the plastic part of the model, the anisotropy of a strength parameter is introduced with a microstructure fabric tensor. Then, the fractures are modelled with finite element methods by considering the development of shear strain localisation bands and an enriched model is used to properly reproduce the shear banding. The cross-anisotropy influence on shear banding is studied through numerical applications of small and large-scale geotechnical problems that engender fractures. The two considered applications are a plane-strain biaxial compression test and an underground gallery excavation. The numerical results provide information about the influence of cross-anisotropy on the appearance and development of shear bands. It has been noticed, among other observations, that the material strength vary with the loading direction and that the development and the shape of the excavation fractured zone that develops around a gallery is strongly influenced by the material anisotropy. [less ▲]Detailed reference viewed: 36 (11 ULg) Environmental impact assessment of bio-based binders: from production to industrial applicationsGerbinet, Saïcha ; Belboom, Sandra ; Briard, Vincent et alPoster (2015, October 15)A binder is used to hold together the fibers forming the mineral wool products (see figure 1). These fibers can be produced from sand and recycled glass for glass wool products (see figure 2) or from rock ... [more ▼]A binder is used to hold together the fibers forming the mineral wool products (see figure 1). These fibers can be produced from sand and recycled glass for glass wool products (see figure 2) or from rock (volcanic rock, typically basalt or dolomite) for stone wool products. Traditionally, the binders used in mineral wool products are based on phenol-formaldehyde. Due to sanitary and environmental considerations and increased focus on indoor air quality, the producers developed new alternative binders. Especially, Knauf Insulation, a worldwide building insulation manufacturer, developed a binder based on plant starch and called ECOSE. In addition of not using added phenol-formaldehyde , this new binder is also supposed to reduce the environmental impacts of Knauf Insulation mineral wools. Moreover, due to its properties, others applications are now considered for ECOSE such as composite wood panels [1]. The aim of this study is to determine the environmental impact of ECOSE and to compare it with more traditional binders using Life Cycle Assessment (LCA) methodology. LCA analyzes the environmental aspects and potential impacts associated with all the stages of a product's life. In this type of environmental assessment the energy and material flows for the entire life-cycle are surveyed and analyzed with special attention to possible environmental hazards or human health problems. The ISO 14040 and 14044 norms [2, 3] provide the general guidance for performing an LCA. The LCA methodology is first applied to ECOSE main component: glucose. The presentation will present results for glucose production from cereals starches After that, first ECOSE application, glass mineral wool products will be presented in details, including production process (see figure 3). The modelling of the glass mineral wool production process in LCA software GaBi 6 [4] is then described. One of the model specificity is that it allows to perform LCA of any glass wool products produced in Knauf Insulation plants in Europe. The adaptations to the model to allow studying former glass wool product when using phenol-formaldehyde binders will also be presented such as the advantages of this model. Moreover, preliminary results about ECOSE and phenol-formaldehyde glass wool products are explained. Références [1] Knauf Insulation. [cited 2014; Available from: http://www.knaufinsulation.ua/en. [2] ISO 14044, Environmental management - Life cycle assessment - Requirements and guidelines. 2006. [3] ISO 14040, Environmental management - Life cycle assessment - Principles and framework. 2006. [4] LBP, University of Stuttgart, and PE INTERNATIONAL AG, GaBI 6. 2012: Leinfelden-Echterdingen. p. GaBi 6: Software and database for life cycle engineering. [less ▲]Detailed reference viewed: 15 (0 ULg) Belgian children’s and adolescents’ views on the elderlyFlamion, Allison ; Missotten, Pierre ; Schroyen, Sarah et alPoster (2015, October 15)Detailed reference viewed: 16 (3 ULg) "Lirécrire pour apprendre" : d'un outil d'enseignement à sa mise en oeuvre au 1er degré de l'enseignement secondaireDe Croix, Séverine ; Wyns, MarielleDiverse speeche and writing (2015)Formation à la mise en oeuvre, dans les classes de 1re secondaire, de l'outil "Lirécrire pour apprendre" (Chaire Lirécrire, Fondation Louvain, UCL). Ce dispositif didactique et pédagogique est centré sur ... [more ▼]Formation à la mise en oeuvre, dans les classes de 1re secondaire, de l'outil "Lirécrire pour apprendre" (Chaire Lirécrire, Fondation Louvain, UCL). Ce dispositif didactique et pédagogique est centré sur l'enseignement explicite, dans l'ordinaire de la classe, des stratégies de lecture nécessaires à la compréhension des textes et des opérations d'écriture requises pour réussir à l'école. [less ▲]Detailed reference viewed: 10 (2 ULg) L’apport de la revalidation multidisciplinaire pour les lombalgies - Ecole du DosKaux, Jean-François ; Tomasella, Marco ; Vanderthommen, Marc et alConference (2015, October 15)Detailed reference viewed: 34 (7 ULg) Télémétrie RFID au niveau d'un barrage hydroélectrique : efficacité d'un exutoire de dévalaison et essais d'identification de voies de passagesOvidio, Michaël Scientific conference (2015, October 15)Detailed reference viewed: 24 (5 ULg) HPLC-DAD IDENTIFICATION OF SOME FLAVONOIDS FROM THE LEAVES AND AERIAL PARTS OF BRYONIA ALBA L. SPECIES SPONTANEOUS IN THE ROMANIAN FLORAIelciu, Irina-Ioana ; Păltinean, Ramona; Cieckiewicz, Ewa et alPoster (2015, October 14)Bryonia alba L. is a climbing species, spontaneous in the Romanian flora, which can be found throughout the whole country [1]. It is known for its cytotoxic, analgesic, antipyretic, anti-inflammatory ... [more ▼]Bryonia alba L. is a climbing species, spontaneous in the Romanian flora, which can be found throughout the whole country [1]. It is known for its cytotoxic, analgesic, antipyretic, anti-inflammatory, antibacterial, anti-rheumatic, laxative-purgative and smooth muscle relaxant proprieties, being used both in traditional medicine and in homeopathy [2]. The main objective of this study consists in the evaluation of the flavonoid profile of this species. The vegetal material was harvested from the spontaneous flora of Cluj county (Romania). The vegetal extracts were obtained by ultrasonication, in methanol. Analysis of flavonoids was performed by a HPLC-DAD method and revealed mainly the presence of C-glycosides, of which saponarine was found as the main compound. Quantification of saponarin was also performed, using the HPLC method, on samples collected at different periods of time. Variation of the quantity of saponarine according to harvested samples was determined. Further analysis are under process in order to investigate the structure of these flavonoids and the pharmacological effects of the Bryonia alba L. plant extracts. References: 1. *** Flora Europea, vol. 2, Cambridge, Univ. Press. Cambridge London-New York Melbourne, 1979, p. 298-299 2. Demarque D, Jouanny J, Poitevin B, Saint Jean Y. Pharmacologie et matière médicale homéopathique, 3ième edition, France, CEDH, 2007. [less ▲]Detailed reference viewed: 22 (1 ULg) Guided group purchases of energy renovation services and works in deprived urban neighbourhoodsRuelle, Christine ; Teller, Jacques in Energy Efficiency (2015)The energy retrofitting of housings is progressing very slowly in Wallonia (Belgium) despite individual fiscal measures and subsidies offered by public authorities to support households engaging in this ... [more ▼]The energy retrofitting of housings is progressing very slowly in Wallonia (Belgium) despite individual fiscal measures and subsidies offered by public authorities to support households engaging in this process. This paper explores the use of a method called ‘Guided Group Purchases’ (GPPs), i.e. an approach combining support, guidance and group purchasing of energy renovation services and works, as a possible method to accelerate the retrofitting of the existing housing stock. It reports on an action research experiment conducted in the context of the Interreg project ‘SUN’ (Sustainable Urban Neighbourhoods). The results of this experiment are quite promising. Within a few months, some 80 energy retrofitting interventions (energy audits or insulation works) were implemented in one neighbourhood of the city of Liège. Our evaluation of the experiment showed that the prospect of achieving cost reductions was one of the main initial expectations of participants to the GGPs. Still the participants rather insisted on other benefits after taking part to the initiative. These benefits were mostly related to the guidance they received, to the facilitation with contractors and to the social dynamics generated by the initiative. Several weaknesses were also identified by participants, like the lack of follow-up during and after the works. Our evaluation also highlighted that the main landlords did not participate in the initiative and that the influence of GGPs on costs was limited to specific types of interventions. Despite observed limitations and possible improvements, such a neighbourhood-based approach certainly constitutes a promising avenue for public authorities to support and accelerate the energy retrofitting of private residential buildings in urban neighbourhoods. [less ▲]Detailed reference viewed: 35 (11 ULg) Direct exoplanet detection and characterization using the ANDROMEDA method: Performance on VLT/NaCo dataCantalloube, F.; Mouillet, D.; Mugnier, L. M. et alin Astronomy and Astrophysics (2015), 582Context. The direct detection of exoplanets with high-contrast imaging requires advanced data processing methods to disentangle potential planetary signals from bright quasi-static speckles. Among them ... [more ▼]Context. The direct detection of exoplanets with high-contrast imaging requires advanced data processing methods to disentangle potential planetary signals from bright quasi-static speckles. Among them, angular differential imaging (ADI) permits potential planetary signals with a known rotation rate to be separated from instrumental speckles that are either statics or slowly variable. The method presented in this paper, called ANDROMEDA for ANgular Differential OptiMal Exoplanet Detection Algorithm is based on a maximum likelihood approach to ADI and is used to estimate the position and the flux of any point source present in the field of view. Aims. In order to optimize and experimentally validate this previously proposed method, we applied ANDROMEDA to real VLT/NaCo data. In addition to its pure detection capability, we investigated the possibility of defining simple and efficient criteria for automatic point source extraction able to support the processing of large surveys. Methods. To assess the performance of the method, we applied ANDROMEDA on VLT/NaCo data of TYC-8979-1683-1 which is surrounded by numerous bright stars and on which we added synthetic planets of known position and flux in the field. In order to accommodate the real data properties, it was necessary to develop additional pre-processing and post-processing steps to the initially proposed algorithm. We then investigated its skill in the challenging case of a well-known target, $\beta$ Pictoris, whose companion is close to the detection limit and we compared our results to those obtained by another method based on principal component analysis (PCA). Results. Application on VLT/NaCo data demonstrates the ability of ANDROMEDA to automatically detect and characterize point sources present in the image field. We end up with a robust method bringing consistent results with a sensitivity similar to the recently published algorithms, with only two parameters to be fine tuned. Moreover, the companion flux estimates are not biased by the algorithm parameters and do not require a posteriori corrections. Conclusions. ANDROMEDA is an attractive alternative to current standard image processing methods that can be readily applied to on-sky data. [less ▲]Detailed reference viewed: 21 (0 ULg)