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See detailL'apprentissage coopératif : un outil au service des cours de langue en 5e et 6e années primaires
Crepin, Françoise ULg; Mattar, Cathérine; Blondin, Christiane ULg

in Informations Pédagogiques (2006), 59

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See detail(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement
Lecomte, I.; Henrist, Catherine ULg; Duyckaerts, Monique ULg et al

in Journal of the European Ceramic Society (2006), 26(16), 3789-3797

Concurrently to research conducted on ordinary Portland cement (PC), new types of binders were developed during the last decades. These are formed by alkali-activation of metakaolin or ground-granulated ... [more ▼]

Concurrently to research conducted on ordinary Portland cement (PC), new types of binders were developed during the last decades. These are formed by alkali-activation of metakaolin or ground-granulated blast furnace slag (GGBFS) and are named, respectively, geopolymers (GP) or alkali-activated slag (AAS). Four different cementitious materials were synthesised: PC, AAS, GP, and a mix GP-AAS and fully compared about their compositions and (micro)-structures. X-ray diffraction has revealed the presence of semi-crystalline C-S-H gel binding phase in PC while AAS, GP and GP-AAS are nearly amorphous. Progressive structural changes have been observed between the different samples by means of infrared spectroscopy, Si-29 and At-27 magic-angle-spinning nuclear magnetic resonance spectroscopy: there is a polymerisation extent of the (alumino)-silicate framework from PC [SiQ(1) and SiQ(2) units] to AAS [SiQ(2) and SiQ(2)(1Al) units] and finally to GP [SiQ(4)(2Al) and SiQ(4)(3Al) units]. Scanning electron microscopy has shown that GP is a homogeneous matrix while the other materials are composites containing GGBFS grains surrounded by a binding matrix. Energy dispersive X-ray EDX analyses (line scans) have shown the absence of formation of any specific phase at the matrix-grains interfaces. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

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See detailProgesterone, luteinizing hormone, prolactin and pregnancy-associated glycoproteins during the first trimester pregnancy in cattle.
Ayad, A.; Melo de Sousa, Noelita ULg; Sulon, J. et al

in Proceedings of the 22nd Scientific Meeting of the European Embryo Transfer Association (2006)

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See detailDie Keure van Zeeland
Adam, Renaud ULg

in Bousmanne, Bernard; Thieffry, Sandrine; Wijsman, Hanno (Eds.) Philippe le Beau (1478-1506) : les trésors du dernier duc de Bourgogne : exposition : Bruxelles, Bibliothèque royale de Belqique, Chapelle de Nassau, du 3 novembre 2006 au 27 janvier 2007 : catalogue (2006)

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See detailBibliotheca Lipsiana Bruxellensis : boeken van Justus Lipsius bewaard in de Koninklijke Bibliotheek van Belgïe : tentoonstelling 'Constanten in roerige tijden' gehouden in het Erasmushuis van 1 december 2006 tot 4 februari 2007
Adam, Renaud ULg; De Schepper, Marcus

Book published by Erasmushuis - Musée de la Maison d'Erasme (2006)

Dit werk bestaat uit twee delen : een catalogus en een inventaris uitgegeven ter gelegenheid van de tentoonstelling Constanten in roerige tijden, georganiseerd door de Koninklijke Bibliotheek van België ... [more ▼]

Dit werk bestaat uit twee delen : een catalogus en een inventaris uitgegeven ter gelegenheid van de tentoonstelling Constanten in roerige tijden, georganiseerd door de Koninklijke Bibliotheek van België en het Erasmushuis. In de catalogus zal u vijf onuitgegeven en onlangs ontdekte brieven van Justus Lipsius aan zijn leerling Puteanus terugvinden. De inventaris bevat de documenten met betrekking tot Justus Lipsius die bewaard worden in de Koninklijke Bibliotheek van België (handschriften, oude drukken, enz.). Uitgebreide registers vergemakkelijken het raadplegen van dit naslagwerk dat één van de bekendste verzamelingen van de grote Europese humanist Justus Lipsius beschrijft. [less ▲]

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See detailValuer van der munte – Muntplacaat
Adam, Renaud ULg; Boffa, Sergio

in Bousmanne, Bernard; Thieffry, Sandrine; Wijsman, Hanno (Eds.) Philippe le Beau (1478-1506) : les trésors du dernier duc de Bourgogne : exposition : Bruxelles, Bibliothèque royale de Belqique, Chapelle de Nassau, du 3 novembre 2006 au 27 janvier 2007 : catalogue (2006)

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See detailSwitching mode of deformation in post-localization solutions with a quasi brittle material
Bésuelle, Pierre; Chambon, René; Collin, Frédéric ULg

in Journal of Mechanics of Material and Structures (2006), 1(7), 1115-1134

Localization in a quasi brittle material is studied using a local second gradient model. Since localization takes place in a medium assumed to be initially homogeneous, non uniqueness of the solutions of ... [more ▼]

Localization in a quasi brittle material is studied using a local second gradient model. Since localization takes place in a medium assumed to be initially homogeneous, non uniqueness of the solutions of an initial boundary value problem is then also studied. Using enhanced models implies to generalize the classical localization analysis, especially it is necessary to study solutions more continuous (i.e., continuous up to the degree one) than the ones used in analysis involving classical constitutive equations. Within the assumptions done, it appears that localization is possible in the second gradient model if it is possible in the underlying classical model. Then the study of non uniqueness is conducted for the numerical problem, using different first guesses in the full Newton-Raphson procedure solving the incremental non linear equations. It turns out ¯nally that we are able thanks to this method to reproduce qualitatively the non reproducibility of usual experiment in the post peak regime. [less ▲]

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See detailA finite element method for poro mechanical modelling of geotechnical problems using local second gradient models
Collin, Frédéric ULg; Chambon, René; Charlier, Robert ULg

in International Journal for Numerical Methods in Engineering (2006), 65(11), 1749-1772

In this paper, a new finite element method is described and applied. It is based on a theory developed to model poromechanical problems where the mechanical part is obeying a second gradient theory. The ... [more ▼]

In this paper, a new finite element method is described and applied. It is based on a theory developed to model poromechanical problems where the mechanical part is obeying a second gradient theory. The aim of such a work is to properly model the post localized behaviour of soils and rocks saturated with a pore fluid. Beside the development of this new Coupled theory, a corresponding finite element method has been developed. The elements used are based on a weak form of the relation between the deformation gradient and the second gradient, using a field of Lagrange multipliers. The global problem is solved by a system of equations where the kinematic variables are fully coupled with the pore pressure. Some numerical experiments showing the effectiveness of the method ends the paper. Copyright (c) 2005 John Wiley [less ▲]

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See detailÉrasme de Rotterdam, Gratulatorius panegyricus ad principem Philippum archiducem austriae
Adam, Renaud ULg

in Bousmanne, Bernard; Thieffry, Sandrine; Wijsman, Hanno (Eds.) Philippe le Beau (1478-1506) : les trésors du dernier duc de Bourgogne : exposition : Bruxelles, Bibliothèque royale de Belqique, Chapelle de Nassau, du 3 novembre 2006 au 27 janvier 2007 : catalogue (2006)

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See detailJustinien, Institutiones – Libri feudorum
Adam, Renaud ULg

in Bousmanne, Bernard; Thieffry, Sandrine; Wijsman, Hanno (Eds.) Philippe le Beau (1478-1506) : les trésors du dernier duc de Bourgogne : exposition : Bruxelles, Bibliothèque royale de Belqique, Chapelle de Nassau, du 3 novembre 2006 au 27 janvier 2007 : catalogue (2006)

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See detailLa libre circulation des personnes dans l'Union européenne (1er janvier-31 décembre 2005)
Carlier, Jean-Yves ULg

in Journal de Droit Européen [=JDE] (2006), 14(127), 75-82

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See detailDie Keure van Zeeland
Adam, Renaud ULg

in Bousmanne, Bernard; Thieffry, Sandrine; Wijsman, Hanno (Eds.) Filips de Schone (1478-1506) : schatten van de laatste hertog van Bourgondië : [tentoonstelling : Brussel, Koninklijke Bibliotheek van België, Nassaukapel, van 3 november 2006 tot 27 januari 2007] : catalogus (2006)

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See detailInternational Migration and Its Regulation
Gsir, Sonia ULg; Baganha, Maria; Doomernik, Jeroen et al

in Penninx, Rinus; Berger, Maria; Kraal, Karen (Eds.) The Dynamics of International Migration and Settlement in Europe. A State of the Art. (2006)

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See detailSauvage... le chat l'est-il toujours autant qu'on le souhaite ?
Le Proux de la Rivière, Bettina; Libois, Roland ULg

Learning material (2006)

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See detailFinite element simulations of nanoindentation in beta metastable Ti alloys
Gerday, Anne-Françoise ULg; Clement, N.; Jacques, P. J. et al

in Juster, Neal; Rosochowski, Andrzej (Eds.) Proceedings of the 9th International ESAFORM Conference on Material Forming (2006)

Nanoindentation is a versatile tool to probe local plastic properties of materials. Finite element (FE) modelling is currently used to identify material data from nanoindentation tests [1-4]. The general ... [more ▼]

Nanoindentation is a versatile tool to probe local plastic properties of materials. Finite element (FE) modelling is currently used to identify material data from nanoindentation tests [1-4]. The general ambition of this research is to extract the material parameters describing the response of a new Ti alloy, called Ti-555, in order to perform simulations on representative microscopic cells and guide the optimisation of this alloy. In this paper, the first steps of the identification of the macroscopic flow parameters of the β-phase are described. The nanoindentation tests using a pyramidal Berkovich diamond indenter are performed in the β-phase. The FEM results with different parameters of an isotropic and anisotropic elasto-plastic (EP) constitutive law are analyzed and the predicted shapes are compared to the final shape of the indented material. The FE results very much depend on physical model choices, and cannot rely on an automatic identification approach. [less ▲]

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See detailAn FEM-aided investigation of the deformation during single point incremental forming
He, S.; Van Bael, A.; Van Houtte, P. et al

in Modelling & Simulation in Materials Science & Engineering (2006)

Incremental forming is an innovative and flexible sheet metal forming technology for small batch production and prototyping, which does not require any dedicated die or punch to form a complex shape. This ... [more ▼]

Incremental forming is an innovative and flexible sheet metal forming technology for small batch production and prototyping, which does not require any dedicated die or punch to form a complex shape. This paper investigates the process of single point incremental forming of an aluminium cone both experimentally and numerically. Finite element models are established to simulate the process. The output of the simulation is given in terms of final geometry, the thickness profile of the product and the strain history and distribution during the deformation. Comparison between the simulation results and the experimental data is made. [less ▲]

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See detailIdentification of hardening behavior using inverse modeling and image correlation
Lecompte, D.; Cooreman, S.; Sol, H. et al

in Proceedings of the SEM annual conference and exposition 2006 (2006)

The basic principle of an inverse modeling procedure as it is used for parameter identification, is the generation of a complex and heterogeneous deformation field that contains as much information as ... [more ▼]

The basic principle of an inverse modeling procedure as it is used for parameter identification, is the generation of a complex and heterogeneous deformation field that contains as much information as possible about the parameters to be identified. One way of obtaining such a non-homogeneous deformation is by making the geometry of the specimen less regular. Another possibility is to make the loading conditions more complex. In this paper both options are actually combined by using a biaxial tensile test on a cruciform specimen in order to identify the parameters of a Swift isotropic hardening law. The yield criterion is modeled by the isotropic Von Mises criterion. The optimization technique used is a constrained gradient based Newton-type routine, which means that in every iteration step, a sensitivity calculation has to be performed in order to indicate the direction in which the parameters are to be optimized. The functional to be minimized is a least-squares expression of the discrepancy between the measured and the simulated strain fields at a certain load. The numerical routines as well as the identification results, based on simulated strain fields, are discussed. [less ▲]

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See detailA phenomenological model to simulate mechanical tests on ultrafine-grained aluminium produced by ECAE
Diouf, Boubakar; El Houdaigui, Fouad; Poortmans, S. et al

in Mota Soares, C. A. (Ed.) Proceedings of the III European Conference on Computational Mechanics Solids (ECCM III) (2006)

Results of FEM simulations predicting the mechanical behavior at room temperature of test specimens of ultrafine-grained aluminum produced by ECAE are presented. The constitutive law is either based on a ... [more ▼]

Results of FEM simulations predicting the mechanical behavior at room temperature of test specimens of ultrafine-grained aluminum produced by ECAE are presented. The constitutive law is either based on a Hill model or on the Minty micro-macro model and coupled with an isotropic hardening law and/or kinematic hardening law. The yield locus shape, its size and its position during tension, compression and torsion tests have been studied. Initial texture measurements allow the identification of a constitutive law based on a set of representative crystals and crystal plasticity approach using a Full- Constraint Taylor model. Finite element simulations using the previous constitutive laws are compared with experimental investigations. The results show that applying an initial back stress identified by tensile and compression tests to the yield locus predicts the initial flow stress in torsion test. The Minty micro-macro model coupled with a Voce type hardening model gives a good agreement with experimental results for the prediction of the shape at different stages of deformation of a compressed test specimen. The simulation of tensile tests underline the need of inverse modeling as, due to the test specimen shape, the test is far from being homogeneous. The link between test specimen length and the necking appearance is studied. [less ▲]

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See detailStructural properties of bounded languages with respect to multiplication by a constant
Charlier, Emilie ULg; Rigo, Michel ULg

in Actes des Journées Montoises d'Informatique Théorique (2006)

We consider the preservation of recognizability of a set of integers after multiplication by a constant for numeration systems built over a bounded language. As a corollary we show that any nonnegative ... [more ▼]

We consider the preservation of recognizability of a set of integers after multiplication by a constant for numeration systems built over a bounded language. As a corollary we show that any nonnegative integer can be written as a sum of binomial coefficients with some prescribed properties. [less ▲]

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