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See detailPoro Hypo Plastic analysis of the progressive excavation of the Mol URL connecting Gallery
Desrues, Jacques; Bésuelle, Pierre; Coll, Cécile et al

in Van Cotthem, Alain; Charlier, Robert; Thimus, Jean-Francois (Eds.) EUROCK 2006 - Multiphysics Coupling and Long Term Behaviour in Rock Mechanics (2006)

In the framework of a Euratom research program devoted to Nuclear Waste deposition security assessment, a numerical simulation of the excavation of a gallery in the Boom Clay layer at Mol (Belgium) has ... [more ▼]

In the framework of a Euratom research program devoted to Nuclear Waste deposition security assessment, a numerical simulation of the excavation of a gallery in the Boom Clay layer at Mol (Belgium) has been performed In order to model the progressive excavation and lining installation process, a special sequence of desactivation/activation of sets of elements was elaborated. In particular, this numerical strategy allowed to take into account the fact that, due to the deformation of the massif as the excavation progresses, the material to be excavated once the front has reached a given position into the rock mass cannot be defined a priori, but is resulting of the modelling of the previous phases up to the present one. [less ▲]

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See detailPoroelastic Center of Dilation Revisited
Huynen, Alexandre ULg; Detournay, Emmanuel

in Hellmich, Christian; Pichler, Bernhard; Dietmar, Adam (Eds.) Poromechanics V: Proceedings of the Fifth Biot Conference on Poromechanics (2013, July)

A comparison of the original elastic solution for the center of dilation with the classic Lame ́ solution reveals an unexpected dependence of the center of dilation solu- tion on Poisson’s ratio. This ... [more ▼]

A comparison of the original elastic solution for the center of dilation with the classic Lame ́ solution reveals an unexpected dependence of the center of dilation solu- tion on Poisson’s ratio. This inconsistency is investigated by means of two alternative representations of the singularity which lead to the identification of a compressed zone inside the singularity. The poroelastic equivalent to this nucleus of strain is shown to be the superposition of the elastic one with drained material parameters and an instan- taneous point fluid source associated with a finite volume of fluid that is expelled from the compressed region inside the singularity and is injected in the porous medium. [less ▲]

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See detailPoroelastic Center of Dilation Revisited
Huynen, Alexandre ULg; Detournay, Emmanuel

Conference given outside the academic context (2013)

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See detailPoroelastic Center of Dilation Revisited
Huynen, Alexandre ULg

Master of advanced studies dissertation (2012)

In both elasticity and poroelasticity, the nucleus of strain is usually used to refer to a singular solution such as the point force, the force dipole, the centers of rotation and dilation, etc. These ... [more ▼]

In both elasticity and poroelasticity, the nucleus of strain is usually used to refer to a singular solution such as the point force, the force dipole, the centers of rotation and dilation, etc. These fundamentals solutions constitute the building blocks for various problems of practical importance and are, therefore, relatively well understood. However, a comparison of the original elastic solution for the center of dilation with the classic Lamé solution reveals an unexpected dependence of the center of dilation solution on the Poisson’s ratio. This inconsistency is investigated by means of two alternative representations of the singularity and leads to the identification of a compressed zone inside the singularity. The poroelastic equivalent to this nucleus of strain is shown to be the superposition of the elastic one with drained material parameters and an instantaneous point fluid source associated with a finite volume of fluid that is expelled from the compressed region inside the singularity and is injected in the porous medium. [less ▲]

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See detailPorokératoses verruqueuses multipes.
ARRESE ESTRADA, Jorge ULg; QUATRESOOZ, Pascale ULg; AL RUSTOM, K. et al

in Dermatologie Actualité (2008), 106

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See detailPorokératoses verruqueuses multiples
Arrese Estrada, Jorge ULg; Al Rustom, Kamil; Letot, Bernard ULg et al

in Dermatologie Actualité (2008), 106

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See detailPOROSIMETRY BY DOUBLE-RANDOM MULTIPLE TREE STRUCTURING IN VIRTUAL CONCRETE
Stroeven, Piet; L.B.Le, Nghi; Sluys, L.J. et al

in Image Analysis and Stereology (2012), 31(1), 55-63

Two different porosimetry methods are presented in two successive papers. Inspiration for the development came from the rapidly-exploring random tree (RRT) approach used in robotics. The novel methods are ... [more ▼]

Two different porosimetry methods are presented in two successive papers. Inspiration for the development came from the rapidly-exploring random tree (RRT) approach used in robotics. The novel methods are applied to virtual cementitious materials produced by a modern concurrent algorithm-based discrete element modeling system, HADES. This would render possible realistically simulating all aspects of particulate matter that influence structure-sensitive features of the pore network structure in maturing concrete, namely size, shape and dispersion of aggregate and cement particles. Pore space is a complex tortuous entity. Practical methods conventionally applied for assessment of pore size distribution may fail or present biased information. Among them, mercury intrusion porosimetry and 2D quantitative image analysis are popular. The mathematical morphology operator “opening” can be applied to sections and even provide 3D information on pore size distribution, provided isotropy is guaranteed. Unfortunately, aggregate grain surfaces lead to pore anisotropy. The presented methods allow exploration of pore space in the virtual material, after which pore size distribution is derived from star volume measurements. In addition to size of pores their continuity is of crucial importance for durability estimation. Double-random multiple tree structuring (DRaMuTS), presented herein, and random node structuring (RaNoS) provide such information. The latter method will be introduced in a next issue of Image Anal Stereol. [less ▲]

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See detailLa porosité du droit : A propos des relations du droit avec d'autres disciplines
Sibony, Anne-Lise ULg

in Revue de la Faculté de Droit de l'Université de Liège (2010), (2), 271-278

Le droit est-il dans sa bulle ? Sans doute, il en sort pour entrer au contact des faits, mais ce n’est pas toujours facile. Quels chemins prend-il alors ? Cette leçon explorera l’hypothèse selon laquelle ... [more ▼]

Le droit est-il dans sa bulle ? Sans doute, il en sort pour entrer au contact des faits, mais ce n’est pas toujours facile. Quels chemins prend-il alors ? Cette leçon explorera l’hypothèse selon laquelle certaines sciences dites sociales peuvent l’aider à trouver sa route. Pour utiles que ces sciences soient pour le droit, elles n’en sont pas moins nombreuses et raffinées et les directions qu’elles indiquent peuvent paraître périlleuses. Aussi sera-t-il également question de la prudence que le droit a intérêt à observer lorsqu’il s’aventure sur la route des sciences. En somme, il s’agit de savoir comment le droit peut ouvrir sa bulle sélectivement aux connaissances scientifiques qui se prêtent à un usage juridique. [less ▲]

Detailed reference viewed: 134 (17 ULg)
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See detailPorous biomaterials tailored for cell culture
Grandfils, Christian ULg; Maquet, V; Ropson, N et al

Conference (1995, May 29)

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See detailPorous biomaterials tailored for cell culture.
Grandfils, Christian ULg; Maquet, V; Ropson, N et al

in Cytotechnology (1996), 21

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See detailPorous carbon material
Pirard, Jean-Paul ULg; Pirard, René ULg; Job, Nathalie ULg

Patent (2003)

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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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