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See detailWaste management evolution through years: evaluation of improvement using Life Cycle Assessment methodology
Belboom, Sandra ULg; Renzoni, Roberto ULg; Digneffe, Jean-Marc et al

Conference (2012, September)

Waste is considered as a major concern of our century. New technologies and attempts to improve appeared through years. The goal of this study was to evaluate the improvement of waste management through ... [more ▼]

Waste is considered as a major concern of our century. New technologies and attempts to improve appeared through years. The goal of this study was to evaluate the improvement of waste management through the last forty years. Four steps of time and of technologies of waste treatment were evaluated in an environmental point of view using the life cycle assessment methodology. The first scenario is situated before 1970 with waste landfilling in an open dump without recuperation and valorization of gas. The second one considers the situation between 1990 and 2008 with a plant comprising grinding and sorting of waste to obtain refused derived fuel fraction (RDF) which was burnt in an incinerator, remaining waste being sent to sanitary landfill with recuperation and valorization of gas in electricity. The third one is the current one, in operation since 2009, with incineration of the whole of the residual municipal waste. The last scenario is about future considering the current installation and adding a biomethanation plant using the collected biodegradable fraction of household waste. This environmental evaluation was performed in accordance with the ISO standards 14040 and 14044 and the environmental impacts were calculated with the ReCiPe methodology. We modeled a specific plant situated in Liege using its technical and environmental reports to be as realistic as possible. Main result of this study is the improvement through years starting from the important environmental impact for the landfilling of waste in an open dump to an environmental gain for some categories with the current installation coupled with biomethanation. Global warming impact from the eighties was reduced by 9 in the years 1990-2008 and by 14 for the current scenario alone or coupled with a biomethanation plant. Some sensitivity analyses were used to evaluate the strength of assumptions with for example using a consequential LCA instead of an attributional one and modifying the electricity origin mix. An uncertainty analysis using Monte-Carlo method showed the robustness of our results. This study confirms the environmental improvement of technologies and emissions of waste management through years. [less ▲]

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See detailMeasuring the flowing properties of powders and grains
Lumay, Geoffroy ULg; Boschini, Frédéric ULg; traina, Karl et al

in Powder Technology (2012), 224

A granular material is a complex system which exhibits non-trivial transitions between the static, the quasi-static and the dynamical states. Indeed, an assembly of grains can behave like a solid or a ... [more ▼]

A granular material is a complex system which exhibits non-trivial transitions between the static, the quasi-static and the dynamical states. Indeed, an assembly of grains can behave like a solid or a fluid according to the applied stress. In between solid and fluid granular states, very slow dynamics are observed. When a complete macroscopic characterization of a powder is needed, all these granular states have to be precisely analyzed. In this paper, we show how three measurement techniques can be used to measure the physical properties of a powder. The measurements are based on classical tests modified to meet the recent fundamental researches on granular materials. The static properties of the powder are analyzed through the shape of a heap. The quasi-static behavior is studied with the analysis of the compaction dynamics. Finally, the dynamical regime is monitored through the flow in a rotating drum. In order to illustrate how these measurements can be used in practical cases, analyses are performed with three types of granular materials: silicon carbide abrasives, flours and rice. These selected materials allow to show the influence of the different parameters (grain size, grain size distribution, grain shape) on the macroscopic properties of the assembly. Moreover, these studies show the pertinence of the parameters obtained with the proposed techniques for the rheological characterization of powders and grains. [less ▲]

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See detailSimulacres et Futurs antérieurs: Contributions à une approche narrative du politique
Claisse, Frédéric ULg

Doctoral thesis (2012)

The thesis assembles five publications dealing with the role played by fiction in our experience and apprehension of the world. Can fiction convey contents of knowledge or even constitute a source of ... [more ▼]

The thesis assembles five publications dealing with the role played by fiction in our experience and apprehension of the world. Can fiction convey contents of knowledge or even constitute a source of knowledge in itself? This question is broken down into a series of studies about the implicit sociology of American writer William S. Burroughs; industrial music as a critical device; the configuration power of Nineteen Eighty-Four in the denunciation of new technologies of surveillance and social control; the deep homology between power and narrativity; as well as counter-fiction within “societies of control”. The general introduction preceding these publications aims at building two examples of “fictional forms of intelligibility” conceived as cognitive and pragmatic resources used by members of society: “simulacrum”, which consists in criticising a target, in a systematically ironical mode, so as to turn its language and mode of functioning against it; “future perfect”, which proposes the anticipation of a threat described as having already occurred, in order to demonstrate the urgency in taking action to thwart it. The thesis defends a minimalist and holist conception of fictional knowledge: it is as a means at the service of the mimetic modelling of social and political processes that fiction activates a sense of possibilities and exerts a cognitive function. In this way, these collected works intend to give the first elements of a research programme in social and political sciences around power of and as a narrative. Narrative appears not only as an object, but especially as a tool for analyzing politics. [less ▲]

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See detailTraitement d'incidents critiques dans le cadre de séminaires de pratiques réflexives organisés dans la formation initiale des enseignants en langues modernes à l'Université de Liège
Simons, Germain ULg

in GAUX, Christine; VINATIER, Isabelle (Eds.) Outils pour la formation, l'éducation et la prévention : contributions de la psychologie et des sciences de l'éducation. Actes du colloque OUFOREP (2012, June)

Cet article analyse une partie de notre dispositif de formation initiale en didactique des langues modernes à l'ULg, en l'occurrence les séminaires de pratiques réflexives. Une partie de ces séminaires ... [more ▼]

Cet article analyse une partie de notre dispositif de formation initiale en didactique des langues modernes à l'ULg, en l'occurrence les séminaires de pratiques réflexives. Une partie de ces séminaires est consacrée au traitement d'incidents critiques vécus lors des stages d'enseignement. La démarche méthodologique de ces séminaires est d'abord décrite et commentée. Ensuite, nous proposons quelques éléments d'évaluation de ces séances, tant du point de vue des étudiants que des formateurs. Enfin, nous clôturons cet article avec la formulation de trois questions ouvertes portant sur ce volet du dispositif de formation mais aussi, de manière générale, sur la problématique du développement de la démarche réflexive. [less ▲]

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See detailEnvironmental product declarations of mineral paving, a tool for sustainable product choices
Belboom, Sandra ULg; Renzoni, Roberto ULg; Tourneur, Francis ULg et al

Poster (2012, May 30)

This study performs the environmental product declarations for three Belgian mineral products, two granite and one sandstone paving. Both main goals of this work were to obtain Belgian environmental ... [more ▼]

This study performs the environmental product declarations for three Belgian mineral products, two granite and one sandstone paving. Both main goals of this work were to obtain Belgian environmental product declarations to strengthen existing databases and to get similar information for their Asian counterparts. Indeed, competition with China for bluestone products and with India for sandstone pavement is very important due to very competitive prices despite their foreign origin and possibly higher induced environmental impacts. Environmental product declarations of Belgian bluestone and sandstone products were conducted in accordance with the ISO standards and following the stand-ard NF P 01-010. CML 2001 method was used to obtain environmental impacts for ten categories as climate change, acidification, abiotic resources depletion, etc. Boundaries of the Belgian systems are the same and the life cycle assessment comprises all steps from the extraction of minerals to the implementation on site. Use and end of life steps were neglected due to the low required maintenance and the inert nature of the paving. For Asian products, the analysis is reduced to the transportation of the functional unit, mainly due to the lack of reliable data. This work highlights the negative effect of long distance transportation of heavy and non-energetic products. Indeed, the environmental impacts of the sole transport of Asian products are at least as important as those obtained for the whole life cycle of Belgian products, whatever the category taken into account (climate change, acidification, air pollution, etc.). CML 2001 methodology was successfully applied to these five studies about three Belgian products and two abroad transportation steps. Comparison of the 5 corresponding environmental product declarations permits to highlight the importance of the transport on environment and to promote, supposing equal performance, local prod-ucts in a more environmental-friendly point of view. [less ▲]

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See detailY a-t-il managérialisation de l'intervention sociale ?
Vrancken, Didier ULg

Conference given outside the academic context (2012)

Que ce soit au sein des entreprises privées, publiques ou au sein des associations, la managérialisation devient aujourd'hui un phénomène qui traverse également l'intervention sociale et engendre nombre ... [more ▼]

Que ce soit au sein des entreprises privées, publiques ou au sein des associations, la managérialisation devient aujourd'hui un phénomène qui traverse également l'intervention sociale et engendre nombre de contradictions pour les "travailleurs du social". [less ▲]

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See detail"Latinum est : non legitur". Lire le latin et traduire le latin en grec en Orient
Rochette, Bruno ULg

in Scrivere e leggere nell'Alto Medioevo (2012, May)

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See detailIn vitro multiplication of an industrial fiber plant: kenaf (Hibiscus cannabinus L.)
Arbaoui, Sarra; Campanella, Bruno ULg; Paul, Roger ULg et al

Poster (2012, April 23)

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See detailFirst assessment of the biogeochemistry of the upper Congo River
Darchambeau, François ULg; Bouillon, S.; Borges, Alberto ULg

Poster (2012, April 22)

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See detailVariability of methane in the epilimnion of Lake Kivu
Borges, Alberto ULg; Abril, G.; Morana, C. et al

Poster (2012, April 22)

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See detailCharacterisation of macadamia nuts using X-ray microtomography
Plougonven, Erwan ULg; Srichamnong, Warangkana; Srzednicki, George et al

in Micro-CT User Meeting Abstract Book (2012, April 05)

Macadamia nuts are among the most nutritious and highest in monounsaturated oil content among edible nuts1. They are widely grown in Australia (46 % of total production), United States of America ... [more ▼]

Macadamia nuts are among the most nutritious and highest in monounsaturated oil content among edible nuts1. They are widely grown in Australia (46 % of total production), United States of America, especially in Hawaii, South Africa and Guatemala2. In practice, there are several steps involved in macadamia processing, including sorting and grading, drying, cracking, roasting, packaging and storage. Drying is a very crucial step as it needs to preserve macadamia quality as well as enhance storage stability through the reduction of water activity. It is obvious that physical properties of the nut contribute to its drying characteristics, and hence its storage stability. Accurate measures such as kernel volume ratio or shell density could help for improving drying efficiency. We present a methodology to investigate structural differences between varieties of macadamia nuts in order to understand the factors involved in storage stability. Fresh nuts-in-shell are scanned by X-ray microtomography, and the different parts of the nuts (shell, kernel, tracheids) are segmented by a set of classical 3D image operators. After image segmentation, volumes are determined, and additional weighing of the nuts allows density measurements. These quantities are plotted for several nuts from each variety. [less ▲]

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See detailSearching for a theoretical relation between reverberation and the scattering coefficients of surface in a room
Embrechts, Jean-Jacques ULg

in Proceedings of the Acoustics 2012 Nantes conference (2012, April)

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See detailEthique et renseignement
Cools, marc; Debruyne, Emmanuel; Franceus, Frank et al

in Cahiers d'études du Renseignement (2012), 1

Périodique réalisé par le Belgian Intelligence studies center sur base du colloque intitulé: Ethique et renseignement

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See detailLes haut-parleurs électrodynamiques
Embrechts, Jean-Jacques ULg

Learning material (2012)

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See detailNuclear Trade Regulation in the European Union
Michel, Quentin ULg

Learning material (2012)

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See detailMicrostructure characterisation of nanocomposite polymeric foams by X-ray microtomography
Plougonven, Erwan ULg; Detrembleur, Christophe ULg; Tran, Minh Phuong ULg et al

Poster (2012, March 26)

Recent advances in microstructured materials have given rise to many new types of composites that exhibit original and interesting physical properties. For example, a nanocomposite made of carbon ... [more ▼]

Recent advances in microstructured materials have given rise to many new types of composites that exhibit original and interesting physical properties. For example, a nanocomposite made of carbon nanotubes inside a polymer matrix shows exceptional electromagnetic interference shielding effectiveness when foamed. However, the effective properties of such materials strongly depend on the shape and topology of the microstructural cells. An accurate method for investigating the cellular microstructure is X-ray microtomography (XRμT), for it is non-destructive, and it provides 3D geometric information. Although it cannot be used to observe nanofiller dispersion, it has a strong potential for cell structure characterisation. In order to reduce the need for trial and error in tailoring these materials, our objective is to quantify, using XRμT, cellular microstructure, for two different types of foaming procedures, namely supercritical CO2 batch foaming and freeze drying, to be able to establish a link between the structure and its shielding effectiveness. The main difficulty stems from the type of material being studied: it is light, therefore hardly absorbs X-rays, cell size is small compared to the resolution capacity of the tomograph, and cell wall thickness is extremely thin in some cases, making them very hard to discern in the images. For these reasons, common image analysis tools for identifying and delimiting objects in an image prove impractical. We propose an original method that uses the 3D autocorrelation function of the tomograms to determine statistical information from these images, such as average cell size and anisotropy, without the need to binarise and segment the images. [less ▲]

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See detailEU Dual-Use Trade Control and Green Paper
Michel, Quentin ULg

Scientific conference (2012, March 07)

Detailed reference viewed: 34 (4 ULg)