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See detailUse of simulation in the commissioning of an office building
Andre, Philippe ULg; Lacôte, P.; Adam, Ch. et al

in Proceedings of SSB'2002 congress (2002, December)

In the frame of two successive IEA-ECBCS annexes, the « CA-MET » building in Namur was the object of commissioning and re-commissioning activities. First, during the construction of the building and ... [more ▼]

In the frame of two successive IEA-ECBCS annexes, the « CA-MET » building in Namur was the object of commissioning and re-commissioning activities. First, during the construction of the building and installation of the HVAC plant, a systematic survey of the work was carried out in the frame of IEA Annex 34 (“Fault Detection”). Therefore, attention was paid to a specific part of the plant (a typical Air handling Unit) and a number of testing and verifications were performed, as a complement to the normal and ongoing commissioning activities: - testing and balancing of air and water networks - air flowrate measurements - water flowrate measurements - control system analysis The most important faults identified in this part of the project were classified according to the IEA 34 template and, for each of these faults, the possibility of developing an automatic fault detection method was analysed. The paper will report on the most relevant problems and present the automatic fault detection method proposed. In a second step, which occurred during in the early stages of the operational phase of the building, a further verification of specific subsystems was carried out, as part of a re-commissioning activity. This work is being realized in the frame of IEA Annex 40 and ends up with a proposal of systematic verification procedure to be applied, as a first example, to a VAV system. This procedure follows a hierarchical approach (bottom-up), starting with the local VAV loop, going through the AHU and ending with the chilled water production equipment. The paper reports on the application of the procedure to the selected building and will be based upon experimental results obtained during target monitoring campaigns. [less ▲]

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See detailSimulation of a non conventional HVAC plant in an experimental building devoted to artificial fog production.
Andre, Philippe ULg; Boreux, Jean-Jacques ULg; Lacôte, P. et al

in Proceedings of SSB'2002 Congress (2002, December)

In the frame of a european project dealing with the issue of transport safety improvement in fog conditions, a new experimental building is being constructed on the FUL campus, in the southern part of ... [more ▼]

In the frame of a european project dealing with the issue of transport safety improvement in fog conditions, a new experimental building is being constructed on the FUL campus, in the southern part of Belgium. This building hosts a climatic chamber in which a given indoor climate is to be maintained (temperature and relative humidity) whatever the external climate. Control of the internal climate will be performed by means of a specific HVAC plant. The general environmental context of the project led to the selection of non conventional solutions for the plant: solar collectors (both thermal and photovoltaic) are associated with a reversible heat pump in order to either heat or cool the building. In some circumstances, simultaneous heating and cooling of different rooms of the building will be necessary and possible. Energy distribution within the building will be made possible by different systems: - floor heating and/or cooling - cooling or heating ceiling - ventilation and Air handling Unit The paper reports on the use of building and HVAC system simulation in order to support the design of the plant. Simulation is carried out in the TRNSYS environment and gathers the following components: building, reversible heat pump, thermal solar collectors, photovoltaic solar collectors, floor heating, cooling ceiling, Air Handling Unit, storage tanks. Parameters identification for the different components will be developed. The paper will focus on specific problems connected to the simultaneous control of both temperature and relative humidity in situation close to the saturation state. The whole design methodology will be situated in the general context of the building life cycle and will make use of some ideas presented in the IEA Annex 30 research project. [less ▲]

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See detailIce storage system (ISS) : phase change modelling (TRNSYS 15). Simulation of a typical HVAC primary plant equipped with an ice sotrage unit.
Adam, Ch.; Andre, Philippe ULg

in Proceedings of SSB'2002 congress (2002, December)

An ice storage can be an interesting option in a HVAC plant. It reduces the electricity costs and increases the HVAC plant capabilities. ISS reduces the on-peak power and shifts the cooling demand from ... [more ▼]

An ice storage can be an interesting option in a HVAC plant. It reduces the electricity costs and increases the HVAC plant capabilities. ISS reduces the on-peak power and shifts the cooling demand from the on-peak hours to the off-peak hours. ISS increases the available HVAC plant power, and then, the internal comfort. To store cold energy requires the selection of operating strategies. The objective of these strategies is to meet the global cooling demand of the building. Each strategy offers different technical and economical characteristics. The typical questions the manager of an HVAC plant has to solve are: Which is optimal ice storage tank in my case? Which cooling power? Which cooling capacity? How to run the HVAC plant to minimize the cost? To compare objectively the strategies, the manager needs to reproduce the ISS performances for the same conditions (building, cooling and electrical demands, climate conditions,...). He needs also informations to chose the appropriate plant configuration or operating strategy to meet the global cooling demand taking into account the characteristics of the tank, of the demand curve,... at each moment. A simulation model of an entire HVAC primary plant should provide this information. [less ▲]

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See detailStudy of color centers induced by PIXE irradiation
Absil, J.; Garnir, Henri-Pierre ULg; Strivay, David ULg et al

in Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms (2002), 198(1-2), 90-97

The particle induced X-ray emission method is perfectly adapted to the study, by external beam, of art objects (like paintings) and allows non-destructive analysis of the atomic composition of the target ... [more ▼]

The particle induced X-ray emission method is perfectly adapted to the study, by external beam, of art objects (like paintings) and allows non-destructive analysis of the atomic composition of the target. However, a strange phenomenon occurs during irradiation on some pigments: dark brownish stains appear, and this could be due to the formation of color centers. In fact, these darkening spots progressively fade out and disappear after a few weeks. Heat and UV light accelerate the decreasing process. The aim of this study is to understand the physical processes of the stain creation and to find a way to make stains disappear, avoiding any damage for the painting. (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailApplication of Supercritical carbon dioxide for the preparation of drug-cyclodextrin inclusion compounds
Van Hees, Thierry ULg; Barillaro, Valery; Piel, Géraldine ULg et al

in Journal of Inclusion Phenomena and Macrocyclic Chemistry (2002), 44(1-4), 271-274

Inclusion complexes of drugs into cyclodextrins (CDs) can be obtained at the solid state by means of supercritical dioxide (SCCO2). A successful inclusion with a yield >98.5% has been achieved with ... [more ▼]

Inclusion complexes of drugs into cyclodextrins (CDs) can be obtained at the solid state by means of supercritical dioxide (SCCO2). A successful inclusion with a yield >98.5% has been achieved with piroxicam and beta-CD. The temperature and the time of exposure to SCCO2 have a significant effect on the inclusion yield while the pressure has a negative effect. However, there is a strong interaction between temperature and pressure and this interaction has a positive influence. The molar ratio piroxicam-beta-CD and the addition of ternary alkaline agents were also found to be significant factors. The dissolution rate of the complexes formed using SCCO2 was found to be significantly higher than that of the physical mixture. Inclusion complexes have also been obtained with miconazole treating mixtures of miconazole, CDs and citric acid by SCCO2. This new technique of inclusion of poorly soluble drugs into CDs allows the preparation of solid complexes without using organic solvents and thus without residues. [less ▲]

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See detailMyoglobinurie atypique chez les chevaux au pré
Delguste, Catherine ULg

Conference (2002, November 30)

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See detailEntre Men et Asclépios : se soigner dans l'Asie Mineure antique
Nissen, Cécile ULg

Scientific conference (2002, November 30)

Detailed reference viewed: 16 (1 ULg)
See detailComptes-rendus du symposium « Les acarioses cutanées des animaux de compagnie en dermatologie vétérinaire »
Mignon, Bernard ULg

Book published by Presses de la Faculté de Médecine Vétérinaire de l’Université de Liège (2002)

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See detailPolymer database for encapsulation
Grandfils, Christian ULg

Conference (2002, November 29)

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See detailDual effects of an extra disulfide bond on the activity and stability of a cold-adapted alpha-amylase
D'Amico, Salvino ULg; Gerday, Charles ULg; Feller, Georges ULg

in Journal of Biological Chemistry (2002), 277(48), 46110-46115

Chloride-dependent alpha-amylases constitute a well conserved family of enzymes thereby allowing investigation of the characteristics of each member to understand, for example, relevant properties ... [more ▼]

Chloride-dependent alpha-amylases constitute a well conserved family of enzymes thereby allowing investigation of the characteristics of each member to understand, for example, relevant properties required for environmental adaptation. In this context, we have constructed a double mutant (Q58C/A99C) of the cold-active and heat-labile alpha-amylase from the Antarctic bacterium Pseudoalteromonas haloplanktis, defined on the basis of its strong similarity with the mesophilic enzyme from pig pancreas. This mutant was characterized to understand the role of an extra disulfide bond specific to warm-blooded animals and located near the entrance of the catalytic cleft. We show that the catalytic parameters of the mutant are drastically modified and similar to those of the mesophilic enzyme. Calorimetric studies demonstrated that the mutant is globally stabilized (DeltaDeltaG = 1.87 kcal/mol at 20 degrees C) when compared with the wild-type enzyme, although the melting point (T-m) was not increased. Moreover, fluorescence quenching experiments indicate a more compact structure for the mutated a-amylase. However, the strain imposed on the active site architecture induces a 2-fold higher thermal inactivation rate at 45 degreesC as well as the appearance of a less stable calorimetric domain. It is concluded that stabilization by the extra disulfide bond arises from an enthalpy-entropy compensation effect favoring the enthalpic contribution. [less ▲]

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See detailLifetime measurements and calculations in singly ionized ytterbium
Biémont, Emile ULg; Quinet, Pascal ULg; Dai, Z. W. et al

in Journal of Physics B-Atomic Molecular and Optical Physics (2002), 35(22), 4743-4749

New radiative lifetimes, measured by time-resolved laser-induced fluorescence spectroscopy, are reported for five Rydberg states of singly ionized ytterbium. Free Yb+ ions were produced in a laser-induced ... [more ▼]

New radiative lifetimes, measured by time-resolved laser-induced fluorescence spectroscopy, are reported for five Rydberg states of singly ionized ytterbium. Free Yb+ ions were produced in a laser-induced plasma. The experimental results have been compared with HFR calculations, taking core-polarization effects into account, and a good agreement (within 25%) between theory and experiment is observed for four levels. HFR results are also proposed for np (n less than or equal to 7) and nf (n less than or equal to 8) Rydberg states and compared with available data. [less ▲]

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See detailThe influence of Space Weather and of the ionosphere on Global Navigation Satellite Systems
Warnant, René ULg; Jodogne, Jean-Claude; Nebdi, Hamid

Conference given outside the academic context (2002)

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See detailLe poids des Églises et des sectes au Congo-Kinshasa
Melice, Anne ULg

Conference given outside the academic context (2002)

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See detailLes orientations stratégiques de la Coopération Universitaire au Développement
Marchal, Jean ULg

(2002, November 28)

Chargée, dès 1997, à préparer et à mettre en œuvre les responsabilités nouvelles des universités francophones de Belgique dans le cadre de la coopération universitaire au développement, la C.U.D. n’a ... [more ▼]

Chargée, dès 1997, à préparer et à mettre en œuvre les responsabilités nouvelles des universités francophones de Belgique dans le cadre de la coopération universitaire au développement, la C.U.D. n’a cessé d’identifier, de définir, d’adapter, d’affiner ses orientations stratégiques. Ce processus a été celui d’un apprentissage continu : de nombreuses évaluations internes à la C.U.D., et à ses groupes de travail, une concertation continue avec les autorités publiques, le relais des institutions universitaires du sud, ont permis à la C.U.D. de consolider, tout au long de l’actuel plan quinquennal 1998-2002, les orientations stratégiques qui guident ses programmes et qui constitueront la base des travaux du prochain plan quinquennal. Dans la présente contribution, sont décrites très brièvement les principales orientations stratégiques qui servent de lignes directrices à la C.U.D. [less ▲]

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See detailQuelle est la place de la mémoire dans l'apprentissage du français langue seconde
Lucchini, Silvia ULg

Conference given outside the academic context (2002)

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See detailPerinatal Group B Streptococcal Disease Prevention, Interactive session
Melin, Pierrette ULg

Conference (2002, November 23)

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See detailUne analyse exploratoire des effets des formations continues sur les salariés
Conter, Bernard; Maroy, Christian; Orianne, Jean-François ULg

Conference (2002, November 22)

Detailed reference viewed: 14 (2 ULg)