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See detailPreparation of BaZrO3 powders by a spray-drying process
Robertz, B.; Boschini, Frédéric ULg; Rulmont, André ULg et al

in Journal of Materials Research (2003), 18(6), 1325-1332

The potential use of barium zirconate for the manufacture of corrosion-resistant substrates emphasizes the need for a simple, inexpensive, and easily scalable process to produce high-quality powders with ... [more ▼]

The potential use of barium zirconate for the manufacture of corrosion-resistant substrates emphasizes the need for a simple, inexpensive, and easily scalable process to produce high-quality powders with well-controlled composition and properties. However, the classical solid-state preparation of barium zirconate leads to an inhomogeneous powder unsuitable for applications in highly corrosive environment. For this paper, the possibility to use the spray-drying technique for the preparation of BaZrO3 powders with a controlled size distribution and morphology was investigated. The influence of the nature and concentration of the precursor solution and the influence of the spray-drying step are discussed on the basis of x-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and dilatometric measurements. [less ▲]

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See detailCaractérisation des fluides bi-phasiques cryogéniques par absorption différentielle de rayonnements gamma
Carapelle, Alain ULg

Master of advanced studies dissertation (2003)

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See detailGenetic engineering of the beta-oxydation pathway in the yeast Yarrowia lipolytica to increase the production of aroma compounds
Waché, Y.; Groguenin, A.; Escamilla Garcia, E. et al

in Chemické Listy (2003, June), 97

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See detailStructural evolution of lamellar surfactant-silica hybrids upon calcination
Henrist, Catherine ULg; Cano, I. G.; Rodriguez, M. A. et al

in Composites Science and Technology (2003), 63(8), 1127-1131

A lamellar mesostructured silica was subjected to a progressive heat treatment in order to study its structural evolution and the characteristics of the resulting calcined powder. By combining ... [more ▼]

A lamellar mesostructured silica was subjected to a progressive heat treatment in order to study its structural evolution and the characteristics of the resulting calcined powder. By combining informations from several physical methods, i.e. TG-DTA, XRD, TEM and nitrogen adsorption, it has been possible to evidence the formation of very small particles of silica at a temperature around 450 degreesC, exhibiting a very high value of aspect ratio, consequently to the template loss by combustion. By increasing the temperature above 530 degreesC, the dehydroxylation promotes a decrease in the surface area, followed by the sintering process at higher temperature, which nearly annihilate the surface area of the particles. (C) 2003 Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailStudy of the morphology of copper hydroxynitrate nanoplatelets obtained by controlled double jet precipitation and urea hydrolysis
Henrist, Catherine ULg; Traina, Karl ULg; Hubert, Cédric ULg et al

in Journal of Crystal Growth (2003), 254(1-2), 176-187

A copper hydroxynitrate of stoichiometry Cu-2(OH)(3)NO3, analogous to the layered double hydroxide family, was synthesized by the so-called controlled double jet precipitation technique, and by hydrolysis ... [more ▼]

A copper hydroxynitrate of stoichiometry Cu-2(OH)(3)NO3, analogous to the layered double hydroxide family, was synthesized by the so-called controlled double jet precipitation technique, and by hydrolysis of urea in the presence of copper nitrate. Special attention has been focused on the size, morphology and agglomeration tendency of the particles. The aim of this work is to define the optimum precipitation conditions in terms of quality and dispersability of the recovered product. Such platelet-like particles Can be used as anisotropic fillers in nanocomposite materials. Several reaction parameters such as flow and concentration of the reactant solutions, design of the reactor and addition of a growth modifier were studied. (C) 2003 Elsevier -Science B.V. All rights reserved. [less ▲]

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See detailAnalyse sensorielle : principes de base.
Blecker, Christophe ULg

Conference given outside the academic context (2003)

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See detail2-oxepane-1,5-dione: a precursor of a novel class of versatile semicrystalline biodegradable (co)-polyesters
Latere Dwan'Isa, Jean-Pierre; Lecomte, Philippe ULg; Dubois, Philippe et al

Poster (2003, May 16)

2-oxepane-1,5-dione (OPD) was synthesized by Baeyer-Villiger oxidation of 1,4 cyclohexanedione and ring-opening polymerized by 1-phenyl- 2-propanol / tin octoate with formation of a semicrystalline ... [more ▼]

2-oxepane-1,5-dione (OPD) was synthesized by Baeyer-Villiger oxidation of 1,4 cyclohexanedione and ring-opening polymerized by 1-phenyl- 2-propanol / tin octoate with formation of a semicrystalline polyester of high melting temperature (Tm :147°C). Dibutyin dimethoxide and 2,2-dibutyl-2-stanna-1,3-dioxepane (DSDOP) proved to be efficient initiators for the random copolymerization of ε-caprolactone (εCL) and OPD. Random distribution of the comonomer units was confirmed by DSC, 1H and 13C NMR analyses. A single Tm was observed, which varies regularly and monotonically with the OPD content as result of a cocrystallisation phenomenon. The single glass transition temperature (Tg) obeys the Fox equation. It is noteworthy that a copolymer containing 30 mol % OPD exhibits a Tm of 90°C. It is stable up to 140°C under nitrogen for one hour, such that processing by extrusion is quite possible. The OPD decomposition is maximum at 223°C for a heating rate of 10°C/min. The mechanism of thermal degradation was investigated and cleared up. The ketone increases the copolymer hydrophilicity and thus sensitivity to hydrolysis. The mechanical properties are quite reminiscent of PCL of comparable molecular weight. Quite interestingly, OPD imparts sensitivity to photo-cross-linking to this novel class of materials. [less ▲]

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See detailPrécisions conceptuelles et méthodologiques en matière d’éducation au changement climatique.
Semal, Nathalie ULg

Speech (2003)

Cette allocutiona été présentée lors d'une réunion de travail organisée dans le cadre de la Convention des Nations Unies sur le Changement Climatique, dédiée à l'implémentation de son article 6, relatif à ... [more ▼]

Cette allocutiona été présentée lors d'une réunion de travail organisée dans le cadre de la Convention des Nations Unies sur le Changement Climatique, dédiée à l'implémentation de son article 6, relatif à l'éducation et à la sensibilisation du public au réchauffement climatique. Elle tente de développer quelques principes de base, tirés des enseignements des expériences menées en éducation relative à l'environnement. [less ▲]

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See detailTime correlations and 1/f behavior in backscattering radar reflectivity measurements from cirrus cloud ice fluctuations
Ivanova, K.; Ackerman, T. P.; Clothiaux, E. E. et al

in Journal of Geophysical Research. Atmospheres (2003), 108(D9),

[1] The state of the atmosphere is governed by the classical laws of fluid motion and exhibits correlations in various spatial and temporal scales. These correlations are crucial to understand the short ... [more ▼]

[1] The state of the atmosphere is governed by the classical laws of fluid motion and exhibits correlations in various spatial and temporal scales. These correlations are crucial to understand the short- and long-term trends in climate. Cirrus clouds are important ingredients of the atmospheric boundary layer. To improve future parameterization of cirrus clouds in climate models, it is important to understand the cloud properties and how they change within the cloud. We study correlations in the fluctuations of radar signals obtained at isodepths of winter and fall cirrus clouds. In particular, we focus on three quantities: (1) the backscattering cross-section, (2) the Doppler velocity, and (3) the Doppler spectral width. They correspond to the physical coefficients used in Navier Stokes equations to describe flows, i.e., bulk modulus, viscosity, and thermal conductivity. In all cases we find that power law time correlations exist with a crossover between regimes at about 3 to 5 min. We also find that different type of correlations, including 1/f behavior, characterize the top and the bottom layers and the bulk of the clouds. The underlying mechanisms for such correlations are suggested to originate in ice nucleation and crystal growth processes. [less ▲]

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See detailSTUDY OF SOME FACTORS INFLUENCING BIODEGRADATION OF ISOPROPYLBENZENE BY RHODOCOCCUS ERYTHROPOLIS
Aldric, Jean-Marc ULg; Destain, Jacqueline; Thonart, Philippe ULg

(2003, May 06)

THE PRESENT STUDY EXAMINES THE EFFECT OF VARIOUS FACTORS ON THE BIODEGRADATION OF IPB BY RHODOCOCCUS ERYTHROPOLYS. BY THE IMPLEMENTED PLAN OF PLACKETT AND BURMAN, A POSITIVE EFFECT OF IRON, NEUTRAL pH AND ... [more ▼]

THE PRESENT STUDY EXAMINES THE EFFECT OF VARIOUS FACTORS ON THE BIODEGRADATION OF IPB BY RHODOCOCCUS ERYTHROPOLYS. BY THE IMPLEMENTED PLAN OF PLACKETT AND BURMAN, A POSITIVE EFFECT OF IRON, NEUTRAL pH AND ETHANOL ON THE BIODEGRADATION COULD BE DEMONSTRATED. COMPLEMENTARY EXPERIMENTS IN A BIOREACTOR SHOW THAT ETHANOL, USED AS COSUBSTRATE IN BUFFERED MEDIUM, ALLOWS CELL GROWTH WHILE OPTIMIZING BIODEGRADATION OF IPB. [less ▲]

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See detailLes nouveaux antifongiques
Hayette, Marie-Pierre ULg

in Noso-Bulles, bulletin d'information du comité d'hygiène hospitalière et du GGA du CHU de liège (2003)

L'article est une mise au point sur les antifongiques avec leurs indications, toxicité, posologie et critères de remboursement.

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See detailOrigine des troubles morphosyntaxiques chez des enfants dysphasiques
Maillart, Christelle ULg

Doctoral thesis (2003)

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See detailCoupling GIS with database for hydrogeological mapping.
Bouezmarni, Mohamed ULg

Conference (2003, May)

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See detailCaractérisation et utilisation du micro-habitat du saumon atlantique (Salmo salar) selon la stucture turbulente del'écoulement.
Brown, Julie; Boyer, Claudine; Enders, Eva et al

Conference (2003, May)

Detailed reference viewed: 16 (5 ULg)