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See detailPorous carbon xerogels with texture tailored by pH control during sol-gel process
Job, Nathalie ULg; Pirard, René ULg; Marien, José ULg et al

in Carbon (2004), 42(3), 619-628

Despite commonly accepted ideas, evaporative drying does not always completely destroy the pore texture of phenolic gel. This work shows that very porous carbon materials can be synthesized by evaporative ... [more ▼]

Despite commonly accepted ideas, evaporative drying does not always completely destroy the pore texture of phenolic gel. This work shows that very porous carbon materials can be synthesized by evaporative drying and pyrolysis of aqueous resorcinol-formaldehyde gels provided that the operating variables are correctly chosen. Moreover, in this manner monoliths can be easily produced. The pore texture of the materials was studied before and after pyrolysis in order to determine which synthesis and/or pyrolysis variables have an influence on the final texture of the carbon. Results show that it is possible to tailor the morphology of these materials by varying the initial pH of the precursors solution in a narrow range. Micro-macroporous, micro-mesoporous, microporous or totally non-porous carbon materials were obtained. The specific surface area is independent from the initial pH whereas the total void volume varies from 0.4 to 1.4 cm(3)/g when the initial pH decreases from 6.25 to 5.45. These materials can be used as catalysts supports or for electrochemical applications, the texture control being an interesting advantage. (C) 2004 Elsevier Ltd. All rights reserved. [less ▲]

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See detailPorous pellets as drug delivery system
Cosijns, A; Nizet, D; Nikolakakis, I et al

in Drug Development & Industrial Pharmacy (2009), 35(6), 655-662

Background: Multi particulate drug delivery systems, such as pellets, are frequently used as they offer therapeutic advantages over single-unit dosage forms. Aim: Development of porous pellets followed by ... [more ▼]

Background: Multi particulate drug delivery systems, such as pellets, are frequently used as they offer therapeutic advantages over single-unit dosage forms. Aim: Development of porous pellets followed by evaluation of potential drug loading techniques. Method: Porous microcrystalline pellets were manufactured and evaluated as drug delivery system. Pellets consisting of Avicel PH 101 and NaCl (70%,w/w) were prepared by extrusion/spheronization. The NaCl fraction was extracted with water and after drying porous pellets were obtained (33.2% porosity). Immersion of the porous pellets in a 15% and 30% (w/v) metoprolol tartrate solution, ibuprofen impregnation via supercritical fluids and paracetamol layering via fluidized bed coating were evaluated as drug loading techniques. Results: Raman spectroscopy revealed that immersion of the pellets in a drug solution and supercritical fluid impregnation allowed the drug to penetrate into the porous structure of the pellets. The amount of drug incorporated depended on the solubility of the drug in the solvent (water or supercritical CO2). Drug release from the porous pellets was immediate and primarily controlled by pure diffusion. Conclusion: The technique described in this research work is suitable for the production of porous pellets. Drug loading via immersion the pellets in a drug solution and supercritical fluid impregnation resulted in a drug deposition in the entire pellet in contrast to fluid bed layering where drugs were only deposed on the pellet surface. [less ▲]

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See detailPorous poly(α-hydroxyacid)/Bioglass® composite scaffolds for bone tissue engineering. I: preparation and in vitro characterisation
Maquet, Véronique; Boccaccini, Aldo R.; Pravata, Laurent et al

in Biomaterials (2004), 25(18), 4185-4194

Highly porous composites scaffolds of poly-D,L-lactide (PDLLA) and poly(lactide-co-glycolide) (PLGA) containing different amounts (10, 25 and 50wt%) of bioactive glass (45S5 bioglass®) were prepared by ... [more ▼]

Highly porous composites scaffolds of poly-D,L-lactide (PDLLA) and poly(lactide-co-glycolide) (PLGA) containing different amounts (10, 25 and 50wt%) of bioactive glass (45S5 bioglass®) were prepared by thermally induced solid-liquid phase separation (TIPS) and subsequent solvent sublimation. The addition of increasing amounts of bioglass® into the polymer foams decreased the pore volume. Conversely, the mechanical properties of the polymer materials were improved. The composites were incubated in phosphate buffer saline at 37°C to study the in vitro degradation of the polymer by measurement of water absorption, weight loss as well as changes in the average molecular weight of the polymer and in the pH of the incubation medium as a function of the incubation time. The addition of bioglass®to polymer foams increased the water absorption and weight loss compared to neat polymer foams. However, the polymer molecular weight, determined by size exclusion chromatography, was found to decrease more rapidly and to a larger extent in absence of bioglass®. The presence of the bioactive filler was therefore found to delay the degradation rate of the polymer as compared to the neat polymer foams. Formation of hydroxyapatite on the surface of composites, as an indication of their bioactivity, was recorded by EDXA, X-ray diffractometry and confirmed by Raman spectroscopy. [less ▲]

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See detailPorous silica obtained from biodegradable and biocompatible inorganic-organic hybrid materials
Tian, Dong; Blacher, Silvia ULg; Dubois, Philippe ULg et al

in Journal of Sol-Gel Science and Technology (1998), 13(1-3), 415-419

Porous silicas have been successfully prepared from poly(ε -caprolactone) (PCL)-silica hybrid materials based on the template approach. The final texture of the porous silica can be tailored by the PCL ... [more ▼]

Porous silicas have been successfully prepared from poly(ε -caprolactone) (PCL)-silica hybrid materials based on the template approach. The final texture of the porous silica can be tailored by the PCL template, i.e., molecular weight and molecular weight distribution, content, type and number of reactive end-groups per chain. Porosity has been investigated by nitrogen adsorption-desorption technique and small angle X-ray scattering (SAXS). [less ▲]

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See detailThe porous structure of biodegradable scaffolds obtained with supercritical CO(2) as foaming agent
Blacher, Silvia ULg; Calberg, Cédric ULg; Kerckhofs, Greet ULg et al

in Studies in Surface Science and Catalysis (2006), 160

Poly(epsilon-caprolactone) foams were prepared, via a batch process, by using supercritical CO(2) as foaming agent. Their porous structure was characterized through helium and mercury pycnometry, scanning ... [more ▼]

Poly(epsilon-caprolactone) foams were prepared, via a batch process, by using supercritical CO(2) as foaming agent. Their porous structure was characterized through helium and mercury pycnometry, scanning electron microscopy (SEM) and X-ray microtomography observations coupled with image analysis. The pore size distributions obtained by these two latter techniques show that the pore structure is more homogeneous when the foaming process is performed under a high CO(2) saturation pressure (higher than 250 bars). [less ▲]

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See detailThe porous structure of biodegradable scaffolds obtained with supercritical CO2 as foaming agent
Blacher, Silvia ULg; Calberg, Cédric ULg; Kerckhofs, Greet ULg et al

in Studies in Surface Science and Catalysis (2006), 160

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See detailLa porphyrie intermittente aigue: une contre-indication rare au traitement de l'infarctus du myocarde.
Legrand, D. A.; Borgoens, P.; LANCELLOTTI, Patrizio ULg

in Revue Médicale de Liège (2008), 63(9), 528-31

The treatment of acute myocardial infarction as described in guidelines, generaly meets with few contra-indications. In our clinical practice, we have met an exceptional one: acute intermittent porphyria ... [more ▼]

The treatment of acute myocardial infarction as described in guidelines, generaly meets with few contra-indications. In our clinical practice, we have met an exceptional one: acute intermittent porphyria. This disease is characterized by acute abdominal pain, neurologic disturbances and cardiac arrhythmias related to different stimuli such as some drugs. Among these drugs, several molecules are usually used for treatment of acute coronary syndromes. Knowledge of these the therapies is crucial to avoid some dangerous consequences. [less ▲]

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See detailThe porphyritic facies and the endoskarns of the Traversella monzodiorite: Implications for the evolution of the main intrusion (Ivrea, Italy)
Vander Auwera, Jacqueline ULg

in Schweizerische Mineralogische und Petrographische Mitteilungen = Bulletin Suisse de Minéralogie et Pétrographie (1990), 70

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See detailLe port des livrées dans les Pays-Bas autrichiens
Stevens, Xavier ULg

in Jansen-Sieben, Ria; Libert, Marc; Vanrie, André (Eds.) Quotidiana : Huldealbum Dr. Frank Daelemans (2012)

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See detailPort et usage d’armes chez les jeunes : de l’accessibilité aux légitimités
Glowacz, Fabienne ULg; Boffé, Anne-Sophie; Hélin, Dominique

Conference (2014, May 19)

Le port d’armes chez les jeunes est un sujet de préoccupation tant du ressort de la santé publique que de la psychologie criminologique. Si l’arme peut être considérée comme un moyen pour le jeune visant ... [more ▼]

Le port d’armes chez les jeunes est un sujet de préoccupation tant du ressort de la santé publique que de la psychologie criminologique. Si l’arme peut être considérée comme un moyen pour le jeune visant à maintenir son identité personnelle et sociale, il est reconnu que la présence d’armes intensifie la menace-intimidation, la violence des conflits entre jeunes et la gravité des blessures. C’est au départ des questions d’une part de l’accessibilité de l’arme réelle et perçue par le jeune (dans l’environnement familial et social), et d’autre part de la légitimité du port et de l’usage d’armes, que la discussion va être menée à partir des données de deux études. Dans la première étude, nous avons analysé sur base d’une enquête menée auprès de 538 des adolescents (42% de filles) recrutés dans divers réseaux scolaires le profil des jeunes qui portent et utilisent une arme, les fonctions attribuées à l’arme (d’intimidation, de défense, de vengeance, de protection, de domination, de réassurance, ludique, ….) ainsi que les facteurs de risque environnementaux (relations aux pairs, milieu familial et scolaire, niveau de délinquance du quartier,..) et personnels (victimisations, agressivité et recherche de sensation). Une seconde étude se basant sur des entretiens avec des mineurs placés en IPPJ impliqués dans un délit avec ou sans arme analyse les dynamiques intentionnelles du port et de l’usage d’armes ainsi que les fonctions qui lui sont attribuées. Plus spécifiquement pour les mineurs délinquants impliqués dans un délit avec arme, ont été développés les dynamiques motivationnelles de l’utilisation de l’arme pendant le délit, l’intentionnalité de l’usage de l’arme de même que les éprouvés émotionnels après le délit. Il en ressort que les adolescents selon leur engagement dans la délinquance présentent des degrés d’accessibilité aux armes et divers types de légitimités qui sous-tendent le port d’armes. [less ▲]

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See detailPortable Holographic Marking Unit
Habraken, Serge ULg; vandormael, Denis; Holman, John, C.

Patent (2003)

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See detailPortable Tool for Finalizing Freehand Drawings : Activity Analysis and Design Requirements
Boulanger, Christelle; Decortis, Françoise ULg; Safin, Stéphane ULg

in Proceedings of EACE 2005 : Annual Conference of the European association of Cognitive Ergonomics (2005)

Within a multidisciplinary team of designers, architects and mechanical engineers, and ergonomists, we participate in a research project (ICC) in design and creative interface. This paper describes a ... [more ▼]

Within a multidisciplinary team of designers, architects and mechanical engineers, and ergonomists, we participate in a research project (ICC) in design and creative interface. This paper describes a participative and iterative approach and reviews the results of field studies involved in the design of a portable tool for finalizing freehand drawings. The results are discussed in terms of Activity Theory and its contribution to this field. [less ▲]

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See detailPortable x-ray fluorescence spectrometer for coating thickness measurement
Carapelle, Alain ULg; Fleury-Frenette, Karl ULg; Collette, Jean-Paul ULg et al

in Review of Scientific Instruments (2007), 78(12),

A handheld x-ray spectrometer has been realized and tested. The purpose of the device is to measure the thickness of coated samples in the range of 1-1500 nm in an industrial environment. Accuracy of ... [more ▼]

A handheld x-ray spectrometer has been realized and tested. The purpose of the device is to measure the thickness of coated samples in the range of 1-1500 nm in an industrial environment. Accuracy of similar to 3% has been achieved in this range with a measurement time of 1 min. Automated software has been implemented to allow utilization by a nonspecialist operator. An automated calibration procedure, based on measurements of reference samples, is used. (C) 2007 American Institute of Physics. [less ▲]

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See detailPortable, high-resolution and user-friendly holographic camera
Georges, Marc ULg; Scauflaire, Véronique; Lemaire, Philippe

in SPIE's International Technical Group Newsletter : Holography (2002), 13(1), 1-9

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See detailLos portafolios : Hacia una evaluacion mas integrada y coherente con el concepto de desempeno complejo
Poumay, Marianne ULg; Maillart, Christelle ULg

in Leclercq, Dieudonné; Cabrera, Alvaro (Eds.) Innovaciones en Dispositivos de Evaluacion de los Aprendizajes en la ensenanza Superior. (in press)

Le présent chapitre prend résolument le parti du témoignage et construit sur l’expérience des auteures. Il choisit quelques référents théoriques, qu’il illustre ensuite par deux expériences ciblées, l’une ... [more ▼]

Le présent chapitre prend résolument le parti du témoignage et construit sur l’expérience des auteures. Il choisit quelques référents théoriques, qu’il illustre ensuite par deux expériences ciblées, l’une chez les étudiants en logopédie/orthophonie et l’autre chez les étudiants en pédagogie de l’enseignement supérieur, deux programmes de l’Université de Liège. Il conclut sur quelques réflexions et perspectives. [less ▲]

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See detailLe portage asymptomatique de Microsporum canis chez le chat
Mignon, Bernard ULg; Brouta, F.; Descamps, F. et al

in Annales de Médecine Vétérinaire (2001), 145

Detailed reference viewed: 20 (1 ULg)