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See detailCompost Pile Monitoring Using Different Approaches:GC-MS, E-nose and dynamic olfactometry
Gutierrez, M. C.; Chica, A. F.; Martin, M. A. et al

in Waste and Biomass Valorization (2014), 5(3), 469-479

The evaluation of odour emissions associated to the composting process is complex because these emissions depend on several factors such as the raw material to be composted, the different stages of the ... [more ▼]

The evaluation of odour emissions associated to the composting process is complex because these emissions depend on several factors such as the raw material to be composted, the different stages of the composting process, meteorological conditions, and others. For this reason, the aim of this paper is to compare complementary approaches to monitor odours. The odour source selected for this study is green waste compost at different maturity stages. The study site is a composting facility located in the south of Belgium. The compared approaches were: a portable e-nose developed by the Environmental Monitoring Research team (Arlon, Belgium) to monitor odorous emissions from the composting piles; chemical analyses performed in the laboratory using a GC–MS (manufactured by Thermo) to analyse volatile organic compounds which were collected by active sampling on Tenax TA sorbent simultaneously to the in situ e-nose measurements and olfactometric measurements to determine the odour concentration (ouE/m3) using the Odile olfactometer (Odotech). The portable e-nose was also used in the laboratory with compost odour samples collected in bags. The large numbers of data sets obtained were explored by statistical methods such as principal components analysis. The results obtained highlight the advantages of monitoring the composting process with these three approaches. Each approach gives different information about the composting process and the emissions generated. While the e-nose is capable of identifying some chemical family emissions and some activities such as turning steps, the GC–MS identifies each chemical compound emitted and dynamic olfactometry quantifies the odour concentration (ouE/m3) in relationship with these emissions. [less ▲]

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See detailCompost pile monitoring with GC-MS, e-nose and olfactometry : comparison of different approaches
Gutierrez, M.C.; Chica, A.F; Romain, Anne-Claude ULg

in Trémier, Anne; Dabert, Patrick; Druilhe, Céline (Eds.) et al Book of abstracts of the 8th international conference ORBIT2012 (2012)

This paper proposes a comparison of complementary approaches to monitor the odours : e-nose, olfactometry and GC-MS. The odour source selected for this study is a green waste compost at different maturity ... [more ▼]

This paper proposes a comparison of complementary approaches to monitor the odours : e-nose, olfactometry and GC-MS. The odour source selected for this study is a green waste compost at different maturity stages. The study site is a composting facility, located in the south of Belgium. [less ▲]

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See detailLe compostage, une pratique meconnue de gestion des dechets.
Culot, Marc ULg; Lebeau, S.

in Bulletin d'Information (Association Royale des Ingénieurs Issus de la Fusagx - Aigx) (1999), 5

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See detailCompound droplet manipulations on fiber arrays
Weyer, Floriane ULg; Lismont, Marjorie ULg; Dreesen, Laurent ULg et al

in Soft Matter (2015), 11

Recent works demonstrated that fiber arrays may constitute new means of designing open digital microfluidic systems. Various processes, such as droplet motion, fragmentation, trapping, release, mixing and ... [more ▼]

Recent works demonstrated that fiber arrays may constitute new means of designing open digital microfluidic systems. Various processes, such as droplet motion, fragmentation, trapping, release, mixing and encapsulation, may be achieved on fiber arrays. However, handling a large number of tiny droplets resulting from the mixing of several liquid components is required for developing microreactors, smart sensors or microemulsifying drugs. Here, we show that the manipulation of tiny droplets onto fiber networks allows for creating compound droplets with a high complexity level. Moreover, this cost-effective and adjustable method may also be implemented with optical fibers in order to develop fluorescence-based biosensor. [less ▲]

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See detailCompound Droplets on Fibers
Weyer, Floriane ULg; Ben Said, Marouen; Hötzer, Johannes et al

in Langmuir (2015), 31(28), 77997805

Droplets on fibers have been extensively studied in the recent years. Although the equilibrium shapes of simple droplets on fibers are well established, the situation becomes more complex for compound ... [more ▼]

Droplets on fibers have been extensively studied in the recent years. Although the equilibrium shapes of simple droplets on fibers are well established, the situation becomes more complex for compound fluidic systems. Through experimental and numerical investigations, we show herein that compound droplets can be formed on fibers and that they adopt specific geometries. We focus on the various contact lines formed at the meeting of the different phases and we study their equilibrium state. It appears that, depending on the surface tensions, the triple contact lines can remain separate or merge together and form quadruple lines. The nature of the contact lines influences the behavior of the compound droplets on fibers. Indeed, both experimental and numerical results show that, during the detachment process, depending on whether the contact lines are triple or quadruple, the characteristic length is the inner droplet radius or the fiber radius. [less ▲]

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See detailCompréhension d'un écrit non littéraire à dominante informative et observation réfléchie de l'usage de la langue
Van Beveren, Julien ULg; Dumortier, Jean-Louis ULg; Dispy, Micheline ULg

in Enjeux : Revue de Formation Continuée et de Didactique du Français (2011), 82

Dans le prolongement d'un article publié dans le même numéro de revue, le présent article consiste en l'analyse d'un écrit non littéraire à dominante informative. Produit à des fins didactiques, cet écrit ... [more ▼]

Dans le prolongement d'un article publié dans le même numéro de revue, le présent article consiste en l'analyse d'un écrit non littéraire à dominante informative. Produit à des fins didactiques, cet écrit est destiné à des élèves entamant le deuxième degré de l'enseignement secondaire. L'article est un moyen d'exemplifier les quatre gestes professionnels présentés dans celui auquel il fait écho. [less ▲]

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See detailCompréhension de la voix passive chez l'adulte trisomique 21 : évaluation et perspectives d'intervention
Comblain, Annick ULg

Master's dissertation (1989)

Les adultes porteurs de la trisomie 21 peuvent-il comprendre des structures morpho-syntaxiques complexes maîtrisées au début de l'adolescence par les personnes en développement normal. Ce travail étudie ... [more ▼]

Les adultes porteurs de la trisomie 21 peuvent-il comprendre des structures morpho-syntaxiques complexes maîtrisées au début de l'adolescence par les personnes en développement normal. Ce travail étudie la compréhension de la voix passive par 30 adultes trisomiques 21. Des perspectives d'intervention et de rééducation sont également envisagées. [less ▲]

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See detailCompréhension de Systèmes Biologiques par la Modélisation Dynamique
Bullinger, Eric ULg

Scientific conference (2012, May 25)

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See detailLa compréhension des opérations additives et soustractives au travers de la résolution de problèmes arithmétiques : présentation des axes directeurs d'une thèse de doctorat en cours de préparation
Fagnant, Annick ULg

in Cahiers du Service de Pédagogie Expérimentale (SPE) (2000), (3-4), 117-132

Cette recherche fait l'objet d'une thèse de doctorat, présentée par l'auteur du présent article dans le cadre d'un mandat d'aspirant au F.N.R.S. Le projet est encadré par une comité de thèse constitué de ... [more ▼]

Cette recherche fait l'objet d'une thèse de doctorat, présentée par l'auteur du présent article dans le cadre d'un mandat d'aspirant au F.N.R.S. Le projet est encadré par une comité de thèse constitué de Marcel Crahay (directeur de thèse, ULg), de Jacqueline Beckers (ULg) et de Lieven Verschaffel (KUL). A l'heure actuelle, l'état d'avancement des travaux ne permet pas encore de présenter les résultats des investigations. Le présent article vise à donner un aperçu des différents axes sur lesquels porte l'étude. [less ▲]

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See detailLa compréhension du fonctionnement de la balance: Une analyse hiérarchique
Crahay, Marcel ULg; Delhaxhe, Arlette

in European Journal of Psychology of Education (1989), 4

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See detailCompréhension du parcours de vie en lien avec l'agir délinquant à l'adolescence
Born, Michel ULg; Froidecoeur, Christelle ULg; Glowacz, Fabienne ULg

in Gaillard, B. (Ed.) Psychologie Criminologique (2008)

Detailed reference viewed: 129 (28 ULg)
See detailLa Compréhension du Vocabulaire aux Significations Multiples de la Black Music
Sacré, Robert ULg

Conference given outside the academic context (2005)

Detailed reference viewed: 11 (1 ULg)
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See detailCompréhension et production des prépositions spatiales topologiques et projectives chez les sujets handicapés mentaux modérés
Fayasse, M.; Comblain, Annick ULg; Rondal, Jean-Adolphe ULg

in Revue Francophone de Déficience Mentale (1992), 3(2), 91-116

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See detailComprehension of an organosolv process for lignin extraction on Festuca arundinacea and monitoring of the cellulose degradation
Schmetz, Quentin ULg; Maniet, Guillaume ULg; Jacquet, Nicolas ULg et al

in Industrial Crops and Products (2016), 94

It is commonly accepted that the current society needs to partially substitute fossil resources by renewable ones. Among many solutions, one approach consists in the development of biorefinery involving ... [more ▼]

It is commonly accepted that the current society needs to partially substitute fossil resources by renewable ones. Among many solutions, one approach consists in the development of biorefinery involving lignocellulosic biomass to produce bio-based materials and fuels. This study focuses on the comprehension of an organosolv treatment designed to break the complex lignocellulosic structure for high purity lignin extraction from tall fescue (Festuca arundinacea Schreb.). This grass benefits from an increasing interest in Western Europe and has been suggested as feedstock for biorefinery. However, its use as material for high purity lignin production has not been determined yet. Ethanol/water, 92/8% [v/v] with H2SO4 0.32 M was investigated at pilot scale under conventional heating (5 °C min−1 during 30 min and stabilized at 148 °C for 5 min). Precipitated lignin were analyzed as well as the composition of side-stream products (recovered cellulosic pulp and the aqueous hydrolysate). Lignin has been recovered at a purity level of 90% with a yield of 60%. The main contaminants were nitrogen containing compounds and degraded hemicelluloses. 2D-HSQC NMR (Two Dimension-Heteronuclear Single Quantum Correlation Nuclear Magnetic Resonance) revealed a co-extraction of ferulates and coumarates function as well as arabinoxylan. Cellulose was recovered at 53% purity with 60% yield. The conditions appear to be too harsh for tall fescue and led to significant amount of cellulose degradation. A process using a lower alcohol concentration will be developed to provide better yields of both cellulose and lignin. [less ▲]

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See detailA comprehensive analysis of mid-term voltage stability
Van Cutsem, Thierry ULg; Jacquemart, Yannick; Marquet, Jean-Noël et al

in IEEE Transactions on Power Systems (1995), 10

Detailed reference viewed: 25 (0 ULg)