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Peer Reviewed
See detailMicro-CT for first line screening of the scaffold material-, cell-and donor-variability on the ectopic bone forming capacity of tissue engineering constructs
Geeroms, Carla; Roberts, Scott; Van Hove, Astrid et al

Conference (2013)

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See detailMicro-CT-based improvement of geometrical and mechanical controllability of selective laser melted Ti6Al4V porous structures
Van Bael, S.; Kerckhofs, Greet ULg; Moesen, M. et al

in MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2011), 528(24), 7423-7431

Despite the fact that additive manufacturing (AM) techniques allow to manufacture complex porous parts with a controlled architecture, differences can occur between designed and as-produced morphological ... [more ▼]

Despite the fact that additive manufacturing (AM) techniques allow to manufacture complex porous parts with a controlled architecture, differences can occur between designed and as-produced morphological properties. Therefore this study aimed at optimizing the robustness and controllability of the production of porous Ti6Al4V structures using selective laser melting (SLM) by reducing the mismatch between designed and as-produced morphological and mechanical properties in two runs. In the first run, porous Ti6Al4V structures with different pore sizes were designed, manufactured by SLM, analyzed by microfocus X-ray computed tomography (micro-CT) image analysis and compared to the original design. The comparison was based on the following morphological parameters: pore size, strut thickness, porosity, surface area and structure volume. Integration of the mismatch between designed and measured properties into a second run enabled a decrease of the mismatch. For example, for the average pore size the mismatch decreased from 45% to 5%. The demonstrated protocol is furthermore applicable to other 3D structures, properties and production techniques, powder metallurgy, titanium alloys, porous materials, mechanical characterization, tomography. (C) 2011 Elsevier B.V. All rights reserved. [less ▲]

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Peer Reviewed
See detailMicro-CT: a powerful tool for the characterization and evaluation of the bone formatting capacity of calcium phosphate–stem cells tissue engineering constructs
Kerckhofs, Greet ULg; Roberts, Scott J.; Wevers, Martine et al

in Abstract book SkyScan User Meeting 2011 (2011)

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See detailMicro-entreprises in rural areas : redeployment of rurality in Walloon Region
Brulard, Cécile; Burny, Philippe ULg; Dogot, Thomas ULg et al

in 18th European Seminar on Extension Education "Supporting viable rural communities" : proceedings, September 2007 (2007)

Detailed reference viewed: 32 (14 ULg)
Peer Reviewed
See detailMICRO-GIS : A System for Spatial Data Handling with Microcomputer
Donnay, Jean-Paul ULg

in Proceedings of the 1986 ACSM-ASPRS Convention (1986)

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See detailMICRO-H2 – Microbiological production of hydrogen: study of microalgal and bacterial processes
Calusinska, Magdalena ULg; Joris, Bernard ULg; Wilmotte, Annick ULg et al

Poster (2011, September 07)

The project MICRO-H2 aims to study and exploit the microbial (bacterial and algal) production of hydrogen (H2). In addition to building a competence centre around the H2 production by microorganisms and ... [more ▼]

The project MICRO-H2 aims to study and exploit the microbial (bacterial and algal) production of hydrogen (H2). In addition to building a competence centre around the H2 production by microorganisms and the molecular monitoring of the processes, this project tries to address two main socio-economic issues. First, transport and many economic activities will be based on hydrogen energy in the near future. Secondly, many researches and technology developments deal with renewable resources. Therefore, a new integrated technology for a sustainable development should be promoted. Photofermentation and dark-fermentation are the most promising ways to produce biohydrogen. The main advantage of the first process is the complete conversion of substrate, if any, to hydrogen. However, present H2-production rates by microalgae remain low. Therefore, a better understanding of the microalgal hydrogen metabolism and rate improvements by genetic engineering are needed. On the other hand, dark-fermentation achieves at present far higher H2-production rates, but improvements are expected through monitoring and optimisation of bacterial diversity and activity. The objectives about bacterial H2 production were to increase knowledge, stability potentialities and investigation skills about the consortia of bacteria involved in bioreactors treating wastewater rich in carbohydrates to produce biohydrogen. The project focused mainly on the study of the potentialities of different consortia, with a focus on Clostridium strains. Concerning the microalgal production of H2, the objectives were to increase knowledge on the metabolic interactions that determine H2 evolution at the cellular level and to produce new strains with increased ability for H2 production in the two-stage process. [less ▲]

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See detailMicro-informatique et apprentissage des savoirs fondamentaux. L'exemple des coordonnées géographiques.
Merenne-Schoumaker, Bernadette ULg; Mabille, Georges; Kairis, Marie-Anne

in Historiens et Geographes (1987), (313), 769-776

Présentation d'expériences menées dans plusieurs classes du secondaire inférieur afin de travailler l'apprentissage des coordonnées géographiques à l'aide de deux didacticiels que nous avons conçu ... [more ▼]

Présentation d'expériences menées dans plusieurs classes du secondaire inférieur afin de travailler l'apprentissage des coordonnées géographiques à l'aide de deux didacticiels que nous avons conçu : Latitude et Princess [less ▲]

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See detailMicro-informatique et enseignement de la géographie
Merenne-Schoumaker, Bernadette ULg; Baudot, Yves

in Revue de la Direction Générale de l’Organisation des Etudes (1985), 7

Presentation of research conducted as part of a contract FRFC. Objective of the work: facilitate the introduction of microcomputers in geography classes in secondary education

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See detailLa micro-informatique et l'enseignement de la géographie : les leçons des expériences anglaises, néerlandaises et belges
Merenne-Schoumaker, Bernadette ULg

in Revue de Géographie de Lyon (1988), 63(2-3), 23-29

Comparison of experiments conducted in Great Britain, Nederland and Belgium to identificate the fields in wich application of micrcomuters to geography teaching is best suited

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See detailLa micro-informatique et l'enseignement de la géographie
Merenne-Schoumaker, Bernadette ULg; Mabille, Georges

in G.E.O. (1987), (22 (numéro spécial)), 129

Premier ouvrage de synthèse en langue française relatif à l'introduction de la micro-informatique dans les cours de géographie de l'enseignement secondaire. Quatre grandes parties : 1. Le micro-ordinateur ... [more ▼]

Premier ouvrage de synthèse en langue française relatif à l'introduction de la micro-informatique dans les cours de géographie de l'enseignement secondaire. Quatre grandes parties : 1. Le micro-ordinateur et l'enseignement; 2. Les potentialités du micro-ordinateur; 3. Trois grands groupes d'applications privilégiées en géographie; 4. Comment élaborer un didacticiel et l'évaluer? [less ▲]

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See detailMicro-macro analysis of steel sheet behaviour in finite element simulations. Application to deep-drawing process.
Duchene, Laurent ULg; Godinas, A.; Cescotto, Serge ULg et al

in Journal de Physique IV (2003), 105

This paper presents a constitutive law based on taylor's model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation method ... [more ▼]

This paper presents a constitutive law based on taylor's model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation method has been developed. This local yield locus model uses a discrete representation of the material's texture. The interpolation method is presented and a deep-drawing application is simulated in order to show up the influence of the texture evolution during forming processes. [less ▲]

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See detailMicro-macro analysis of steel sheet behaviour in finite element simulations. Application to deep-drawing process.
Duchene, Laurent ULg; Godinas, A.; Cescotto, Serge ULg et al

in Cescotto, Serge (Ed.) Proceedings of the Sixth European Mechanics of Materials Conference (EMMC6) Non Linear Mechanics of Anisotropic Materials (2002, September)

This paper presents a constitutive law based on Taylor’s model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation method ... [more ▼]

This paper presents a constitutive law based on Taylor’s model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation method has been developed. This local yield locus model uses a discrete representation of the material’s texture. The interpolation method is presented and a deep-drawing application is simulated in order to show up the influence of the texture evolution during forming processes. [less ▲]

Detailed reference viewed: 37 (5 ULg)
See detailMicro-macro mechanical modeling of bone-implant interface by means of the homogenization theory
Amor, Nadia; Van Cleynenbreugel, Tim; Geris, Liesbet ULg et al

Poster (2006, December)

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See detailA Micro-Macroapproach to Predict Stiction due to Surface Contact in Microelectromechanical Systems
Wu, Ling ULg; Noels, Ludovic ULg; Rochus, Véronique et al

in IEEE/ASME Journal of Microelectromechanical Systems (2011), 20(4), 976-990

Stiction, which results from contact between surfaces, is a major failure mode in micro electro-mechanical systems (MEMS). Indeed microscopic structures tend to adhere to each other when their surfaces ... [more ▼]

Stiction, which results from contact between surfaces, is a major failure mode in micro electro-mechanical systems (MEMS). Indeed microscopic structures tend to adhere to each other when their surfaces enter into contact and when the restoring forces are unable to overcome the interfacial forces. Since incidental contacts cannot be completely excluded and since contacts between moving parts can be part of the normal operation of some types of MEMS, stiction prediction is an important consideration when designing micro and nano-devices. In this paper a micro-macro multi-scale approach is developed in order to predict possible stiction. At the lower scale, the unloading adhesive contact-distance curves of two interacting rough surfaces are established based on a previously presented model [L. Wu et al., J. Appl. Phys. 106, 113502, 2009]. In this model, dry conditions are assumed and only the van der Waals forces as adhesion source are accounted for. The resulting unloading adhesive contact-distance curves are dependant on the material and on surface properties, such as, elastic modulus, surface energy and on the rough surfaces topography parameters; the standard deviation of asperity heights and the asperities density. At the higher scale, a finite element analysis is considered to determine the residual cantilever beam configuration due to the adhesive forces once contact happened. Toward this end, the adhesive contact-distance curve computed previously is integrated on the surface of the finite elements as a contact law. Effects of design parameters can then be studied for given material and surface properties. [less ▲]

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See detailMicro-mechanical analysis of steel sheet behaviour during deep-drawing
Duchene, Laurent ULg; Godinas, A.; Habraken, Anne ULg et al

in Proceedings of the First Asian-Pacific Congress on Computational Mechanics: APCOM 2001 (2001)

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See detailA micro-meso model to predict van der Walls and capillary induced stiction in micro-structures
Hoang Truong, Vinh ULg; Noels, Ludovic ULg; Wu, Ling ULg

Conference (2013, December)

Undesirable stiction in MEMS results from the contact between surfaces and is due to the adhesive van der Waal and/or capillary forces, which become important for micro-structures. In this work, a micro ... [more ▼]

Undesirable stiction in MEMS results from the contact between surfaces and is due to the adhesive van der Waal and/or capillary forces, which become important for micro-structures. In this work, a micro-macro multi-scale approach is developed in order to predict possible stiction in MEMS structures At the lower scale, the unloading adhesive contact-distance curves of two interacting rough surfaces are established based on Maugis’ model extended herein to account simultaneously for the van der Waals and the capillary forces. The resulting unloading adhesive contact-distance curves are dependent on the material and surface properties -such as elastic modulus, surface energy- on the rough surfaces’ topography parameters -the standard deviation of asperities heights and the asperities’ density- and on the humidity level. At the higher scale, a beam finite element analysis is considered to determine the residual configuration due to the adhesive forces once contact happened. Toward this end, the adhesive contact-distance curve computed previously is integrated on the surface of the finite elements as a contact law. [less ▲]

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See detailA micro-meso-model of intra-laminar fracture in fiber-reinforced composites based on a Discontinuous Galerkin/Cohesive Zone Method
Wu, Ling ULg; Tjahjanto, Denny; Becker, Gauthier ULg et al

in Engineering Fracture Mechanics (2013), 104

The recently developed hybrid discontinuous Galerkin/extrinsic cohesive law framework is extended to the study of intra{laminar fracture of composite materials. Toward this end, micro-volumes of di erent ... [more ▼]

The recently developed hybrid discontinuous Galerkin/extrinsic cohesive law framework is extended to the study of intra{laminar fracture of composite materials. Toward this end, micro-volumes of di erent sizes are studied. The method captures the debonding process, which is herein proposed to be assimilated to a damaging process, before the strain softening onset, and the density of dissipated energy resulting from the damage (debonding) remains the same for the di erent studied cell sizes. Finally, during the strain softening phase a micro{crack initiates and propagates in agreement with experimental observations. We thus extract a resulting mesoscale cohesive law, which is independent on the cell sizes, using literature methods. [less ▲]

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See detailA micro-model of the intra-laminar fracture in fiber-reinforced composites based on a discontinuous Galerkin/extrinsic cohesive law method
Wu, Ling ULg; Tjahjanto, Denny; Makradi, Ahmed et al

Conference (2013, June)

The hybrid discontinuous Galerkin (DG)/extrinsic cohesive law (ECL) method was recently proposed [1] to circumvent the drawbacks of the cohesive element methods. With the DG/ECL method, prior to fracture ... [more ▼]

The hybrid discontinuous Galerkin (DG)/extrinsic cohesive law (ECL) method was recently proposed [1] to circumvent the drawbacks of the cohesive element methods. With the DG/ECL method, prior to fracture, the flux and stabilization terms arising from the DG formulation at interelement boundaries are enforced via interface elements in a way that guarantees consistency and stability, contrarily to traditional extrinsic cohesive zone methods. At the onset of fracture, the traction–separation law (TSL) governing the fracture process becomes operative without the need to modify the mesh topology since the cohesive elements required to integrate the TSL are already present. This DG/ECL method has been shown to be an efficient numerical framework that can easily be implement in parallel with excellent scalability properties to model fragmentation, dynamic crack propagation in brittle and small-scale yielding materials, both for 3D problems and for thin structures [1, 2]. In this work, following the developments in [3], the DG/ECL method is extended to the study of composite materials failures at the micro-scale. The method is applied to study the transverse traction of composite materials in characteristic micro-volumes of different sizes. The method captures the debonding process, assimilated to a damaging process before the strain softening onset. It is shown that the density of dissipated energy resulting from the damage (debonding) remains the same for the different studied cell sizes. During the strain softening phase, a micro-crack initiates and propagates, in agreement with experimental observations. After strain softening onset, the extracted macroscale cohesive law, obtained by the method proposed in [4], is ultimately shown to converge for the different cell sizes. The predicted behaviors are then compared to experimental results obtained from laminate tests, and are found to be in good agreement. [less ▲]

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See detailMicro-modeling of retirement in Belgium
Dellis, A.; Desmet, R.; Jousten, Alain ULg et al

Report (2002)

The present paper studies the retirement incentives for elderly people in Belgium. We model the incentive structure built into the various public retirement and early retirement systems. First, we compute ... [more ▼]

The present paper studies the retirement incentives for elderly people in Belgium. We model the incentive structure built into the various public retirement and early retirement systems. First, we compute indicators of benefit entitlement such as the social security wealth. Then, we use three different incentive measures based on the notion of social security wealth. In a third step, we perform an empirical estimation of micro-econometric probit and option value models. From our exceptionally rich and broad database, we are able to compute rather accurate measures of all individuals’ pension wealth, as well as of the implicit tax rates the elderly workers face in case of delayed retirement. We find strong evidence of social security based financial incentives inducing most workers to retire at the earliest possible stage. Finally, we use the derived parameter estimates from the probit models to simulate the responses to various policy changes. [less ▲]

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See detailMicro-modelling of retirement incentives in Belgium
Jousten, Alain ULg; Dellis, A.; Desmet, R. et al

in Gruber, J.; Wise, D. (Eds.) Social Security Programs and Retirement around the World: Micro Estimation (2004)

Detailed reference viewed: 19 (8 ULg)