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Showing results 55001 to 55020 of 95174
  The matching efficiency of regional labor markets. A stochastic production function estimation: France 1990-1995; ; Perelman, Sergio  et alin Empirica (2004), (31), 1-25 We evaluate the determinants of aggregate matching efficiency changes through a stochastic translog production frontier model. The efficiency coefficient is represented by a stochastic function of ... [more ▼] We evaluate the determinants of aggregate matching efficiency changes through a stochastic translog production frontier model. The efficiency coefficient is represented by a stochastic function of variables meant to capture workers and firms characteristics. The model is estimated on French data covering twenty-two regions from March 1990 till February 1995. Our estimates suggest that aggregate matching efficiency has decreased steadily in the early nineties. There are also wide cross-regional differences. On average, about 30% of the variations of efficiency observed across time and regions can be related to changes in the explanatory variables used in the model. The most important explanatory variables are the proportion of youngsters, females and immigrants in the stock of job seekers. Long-term unemployment has a significant negative effect, population density a significant positive one. The huge decline in the proportion of permanent job offers has apparently little effect on matching efficiency. [less ▲] Detailed reference viewed: 30 (2 ULg)Matching Grants and Unconditional Grants: The Case with n GoodsJurion, Bernard in Public Finance = Finances Publiques (1979) Detailed reference viewed: 4 (0 ULg)Le matérel archéologique des couches médiévalesHoffsummer, Patrick ; in Otte, Marcel (Ed.) Les fouilles de la place Saint-Lambert à Liège, 2: le Vieux-Marché (1988) Detailed reference viewed: 15 (0 ULg)Material Aspects of Bone Tissue EngineeringOzhukil Kollath, Vinayaraj ; Cloots, Rudi Diverse speeche and writing (2012) Bone tissue engineering is a highly studied topic in material science in the recent decades. Basic principles of chemistry and biology along with advanced material science techniques should be used in ... [more ▼] Bone tissue engineering is a highly studied topic in material science in the recent decades. Basic principles of chemistry and biology along with advanced material science techniques should be used in order to elucidate the parameters which may influence the bone tissue growth on artificial implants. Progress has been made to an advanced level but still there is room for improvements. Especially in case of large bone defects, finding a ‘universal’ replacement implant is difficult. Patient specific data have to be taken in to account to get a good osteointegration. Metal and ceramic implants are commonly tested in case of large bone defects, but a good mimic of natural bone is hard due to various reasons. However fine tuning these materials and combination of these materials are finding good results. Addition of polymer materials in such implants is a recent effective attempt. Different combinations of these materials along with functionalisation using bioactive molecules make the bone tissue engineering nearly perfect. This presentation will discuss about the recent trends in the materials used in bone tissue engineering. [less ▲] Detailed reference viewed: 19 (1 ULg)Material behavior of the hexagonal alpha phase of a titanium alloy identified from nanoindentation testsGerday, Anne-Françoise ; Ben Bettaieb, Mohamed ; Duchene, Laurent et alin European Journal of Mechanics A : Solids (2011), 30 This article focuses on the numerical modeling of nanoindentation tests performed on the hexagonal a phase of Ti-5553 alloy in order to identify its mechanical behavior. The main goal consists in ... [more ▼] This article focuses on the numerical modeling of nanoindentation tests performed on the hexagonal a phase of Ti-5553 alloy in order to identify its mechanical behavior. The main goal consists in determining the relative strength of the slip modes in the a phase of Ti-5553. This work was performed using an elastoviscoplastic crystal plasticity-based constitutive law. The difficulties in determining the slip systems that can be activated and their corresponding critical resolved shear stresses (CRSS) are discussed. Numerical predictions are compared to experimental nanoindentation curves. [less ▲] Detailed reference viewed: 65 (17 ULg)Material data identification to model the single point incremental forming processBouffioux, Chantal ; ; Duchene, Laurent et alin International Journal of Material Forming (2010), 3(Suppl. 1), 979-982 In this study, the Single Point Incremental Forming process (SPIF) is applied on a specific aluminium alloy used in the aerospace industry since this technique and material combine a low specific weight ... [more ▼] In this study, the Single Point Incremental Forming process (SPIF) is applied on a specific aluminium alloy used in the aerospace industry since this technique and material combine a low specific weight, high strength and stiffness properties and high strain levels. To be able to optimize the process, a model and its material parameters are required. It was noticed that a simple isotropic hardening model was not sufficient to provide an accurate tool force prediction [1]. Therefore an elasto-plastic law with a mixed isotropic-kinematic hardening is investigated. The inverse method coupled with the Finite Element (FE) code: "Lagamine" [2] is used to fit the material data of this complex law. In order to validate the model and the material data, a Line test and a Cone test are used. [less ▲] Detailed reference viewed: 98 (33 ULg) Material Identification Using a Bi-Axial Test Machine; ; Habraken, Anne in Proceedings of the International Conference on Advances in Experimental Mechanics (2005) This paper shows the identification of material parameters for a DC06 IF steel sheet of 0.8 mm by mechanical tests. The experimental equipment used consists of a tensile test machine, a bi-axial test ... [more ▼] This paper shows the identification of material parameters for a DC06 IF steel sheet of 0.8 mm by mechanical tests. The experimental equipment used consists of a tensile test machine, a bi-axial test machine able to perform plane-strain and simple shear tests separately or simultaneously and an optical strain gauge. Tensile, plane-strain and simple shear tests were performed at 0°, 45° and 90° from the sheet rolling direction in order to identify Hill 1948 and Hosford 1979 yield criteria. Two identification methods are used: one based on strain measurements (anistropy coefficients) and the other one based on stress measurements (plastic contours). The results confirm that mechanical tests applying other stress-states than tensile are required to obtain accurate material parameters identification. [less ▲] Detailed reference viewed: 24 (1 ULg)Material parameter identification of Cazacu's model for Ti6Al4V using the simulated annealing algorithmGilles, Gaëtan ; Habraken, Anne ; Duchene, Laurent in Materials Science Forum (2010), 636-637 Phenomenological yield criteria are generally described by many material parameters. A technique to identify these parameters is required to find the best fit to the results of the mechanical tests. The ... [more ▼] Phenomenological yield criteria are generally described by many material parameters. A technique to identify these parameters is required to find the best fit to the results of the mechanical tests. The parameter identification by the classical simulated annealing technique is presented in this paper. This algorithm, based on Metropolis’ works [1,2], is a global optimization method that distinguishes between different local optima to reach the global optimum. The anisotropic model used in this study is the one proposed by [3]. To prove the efficiency of the proposed algorithm, the material parameters of Ti6Al4V titanium alloy are identified and compared with those obtained using different identification procedures and the same experimental data. [less ▲] Detailed reference viewed: 80 (33 ULg)Le matérialisme biologique de Lévi-StraussSteinmetz, Rudy in Revue Philosophique de la France et de l'Etranger (1984) Detailed reference viewed: 13 (0 ULg) Matérialisme et histoire dans la linguistique du président de BrossesDroixhe, Daniel in Geckeler, H.; Schlieben-Lange, B.; Trabant, J. (Eds.) et al Logos semantikos. Studia linguistica in honorem E. Coseriu (1921-1981) (1981) Detailed reference viewed: 14 (0 ULg)Le matérialisme pluraliste de Cyrano de BergeracTorero-Ibad, Alexandra in Boulad-Ayoub, Josiane; Torero-Ibad, Alexandra (Eds.) Matérialismes des Modernes: nature et moeurs (2009) Detailed reference viewed: 26 (4 ULg)Le matérialisme transcendantalSeba, Jean-Renaud in Cahiers marxistes (1998) Detailed reference viewed: 53 (2 ULg)Matérialismes des Modernes: nature et moeursTorero-Ibad, Alexandra ; Book published by Presses de l'Université Laval (2009) Detailed reference viewed: 15 (7 ULg)Materialität und Hermeneutik der Schrift in Emine Sevgi Özdamars Romanen 'Das Leben ist eine Karawanserei' und 'Die Brücke vom Goldenen Horn'Viehöver, Vera in Borsò, Vittoria; Cepl-Kaufmann, Gertrude; Reinlein, Tanja (Eds.) et al Schriftgedächtnis - Schriftkulturen (2002) Detailed reference viewed: 103 (4 ULg)Materials for advanced power engineering 1998 : Proceedings of the 6th Liège conferenceLecomte-Beckers, Jacqueline ; Book published by Schriften des Forschungszentrum Julich, Reihe energietechnik/Energy Technology Forschungszentrum Julich (1998) Detailed reference viewed: 22 (1 ULg)Materials for advanced power engineering 2002 : Proceedings of the 7th Liège conferenceLecomte-Beckers, Jacqueline ; ; Book published by Schriften des Forschungszentrum Julich, Reihe energietechnik/Energy Technology Forschungszentrum Julich (2002) Detailed reference viewed: 40 (0 ULg)Materials for advanced power engineering 2006 : Proceedings of the 8th Liège conferenceLecomte-Beckers, Jacqueline ; Carton, Marc ; et alBook published by Schriften des Forschungszentrum Julich, Reihe energietechnik/Energy Technology Forschungszentrum Julich (2006) Detailed reference viewed: 41 (0 ULg)Materials for advanced power engineering 2010 : Proceedings of the 9th Liège conferenceLecomte-Beckers, Jacqueline ; Contrepois, Quentin ; et alBook published by Schriften des Forschungszentrum Julich, Reihe energietechnik/Energy Technology Forschungszentrum Julich (2010) Detailed reference viewed: 165 (2 ULg)Materials of Architecture Heritage and historical Roofs of EuropeHoffsummer, Patrick ; Eeckhout, Jérôme Book published by Institut du patrimoine wallon (2008) Detailed reference viewed: 17 (2 ULg) |
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