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See detailL'élagage des arbres d'alignement : adéquation entre physiologie et économie
Toussaint, André ULg; Kervyn de Meerendre, V.; Delcroix, B. et al

Conference given outside the academic context (2003)

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See detailElargir l’Europe jusqu’où et comment ?
Michel, Quentin ULg

Conference given outside the academic context (2011)

Detailed reference viewed: 53 (3 ULg)
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See detailÉlargissement de la base génétique de la principale espèce de cotonnier cultivé Gossypium hirsutum L. par la création et l’exploitation de lignées monosomiques d’addition
Sarr, D.; Mergeai, Guy ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2009), 13(1), 187-201

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See detailElargissement du domaine d'application du règlement thermique wallon
Hauglustaine, Jean-Marie ULg; Vandendries, P.; Wauthy, Y.

Book published by CSTC (1988)

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See detailL'élargissement vers la Croatie : un succès de la diplomatie européenne
Lika, Liridon ULg

E-print/Working paper (2013)

Ce 1er juillet 2013, après six années de négociations avec l’Union européenne (UE) et de réformes laborieuses, la Croatie deviendra le 28ème État membre à part entière de la famille européenne. Après la ... [more ▼]

Ce 1er juillet 2013, après six années de négociations avec l’Union européenne (UE) et de réformes laborieuses, la Croatie deviendra le 28ème État membre à part entière de la famille européenne. Après la Slovénie, membre depuis 2004, il s’agit du deuxième pays sortant de la dissolution violente de l’ex-Yougoslavie à rejoindre l’UE. Contrairement à son voisin slovène où les hostilités n’ont duré que quelques jours, la Croatie a connu plusieurs années de guerre et de destruction. Raison pour laquelle elle a été confrontée à une longue période de transition. Depuis son indépendance en 1991, tous les gouvernements croates ont engagé, un processus de consolidation de leur État. Ensuite ils ont consacré leur force à l’adhésion de leur pays à l’Organisation du traité de l’Atlantique Nord (OTAN), concrétisée en 2009, enfin ils ont travaillé à leur entrée dans l’UE. Mais quel intérêt l’Union a-t-elle à voir ces pays la rejoindre ? [less ▲]

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See detailElastase-induced pulmonary emphysema in rats: comparison of computed density and microscopic morphometry.
Onclinx, Cecile; De Maertelaer, Viviane; Gustin, Pascal ULg et al

in Radiology (2006), 241(3), 763-70

PURPOSE: To prospectively compare computed tomographic (CT) quantification of pulmonary emphysema in elastase-treated rats with morphometry and to evaluate the information yielded by CT quantification and ... [more ▼]

PURPOSE: To prospectively compare computed tomographic (CT) quantification of pulmonary emphysema in elastase-treated rats with morphometry and to evaluate the information yielded by CT quantification and pulmonary function tests. MATERIALS AND METHODS: This study was approved by the local committee on care and use of animals in research. Thirty-six animals were used. Emphysema was produced by means of one or two tracheal injections of 300 IU of elastase, 8 weeks apart, in seven and 12 rats, respectively. As a control group, 10 rats received an injection of normal saline. The dynamic resistance, dynamic compliance, and static compliance were measured. CT was performed with 1-mm section thickness and 3-mm intervals. Relative areas of lung with attenuation coefficients lower than nine chosen thresholds (from -900 to -980 HU) and eight percentiles (from 1st to 18th percentiles) of the distribution of attenuation coefficients were compared with measurements of alveoli size--that is, mean interwall distance (MIWD) and mean perimeter per field (MP). Correlations between data obtained with thresholds and percentiles and MIWD and MP were investigated by means of Spearman coefficients (r(s)). Values of pulmonary function tests, most appropriate relative area threshold, and percentile were investigated by means of stepwise multiple regressions. RESULTS: For thresholds, relative surface area with attenuation coefficients less than -940 HU (RA(940)) showed the strongest correlations with findings at microscopy (r(s) = 0.676, P < .001 for MIWD; r(s) = -0.720, P < .001 for MP). For percentiles, the 3rd percentile showed the strongest correlations (r(s) = -0.647, P < .001 for MIWD; r(s) = 0.701, P < .001 for MP). Dynamic compliance and RA(940) or 3rd percentile were complementary for predicting microscopic measurements. CONCLUSION: In rats, RA(940) and the 3rd percentile reflect the extent of elastase-induced pulmonary emphysema and are complementary to dynamic compliance to predict microscopic extent. [less ▲]

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See detailElastic damage to crack transition in a coupled non-local implicit discontinuous Galerkin/extrinsic cohesive law framework
Wu, Ling ULg; Becker, Gauthier ULg; Noels, Ludovic ULg

in Computer Methods in Applied Mechanics & Engineering (2014), 279

One current challenge related to computational fracture mechanics is the modeling of ductile fracture and in particular the damage to crack transition. On the one hand, continuum damage models, especially ... [more ▼]

One current challenge related to computational fracture mechanics is the modeling of ductile fracture and in particular the damage to crack transition. On the one hand, continuum damage models, especially in their non-local formulation which avoids the loss of solution uniqueness, can capture the material degradation process up to the localization of the damage, but are unable to represent a discontinuity in the structure. On the other hand cohesive zone methods can represent the process zone at the crack tip governing the crack propagation, but cannot account for the diffuse material damaging process. In this paper we propose to combine, in a small deformations setting, a non-local elastic damage model with a cohesive zone model. This combination is formulated within a discontinuous Galerkin nite element discretization. Indeed this DG weak formulation can easily be developed in a non-local implicit form and naturally embeds interface elements that can be used to integrate the traction separation law of the cohesive zone model. The method remains thus consistent and computationally e cient as compared to other cohesive element approaches. The effects of the damage to crack transition and of the mesh discretization are respectively studied on the compact tension specimen and on the double-notched specimen, demonstrating the efficiency and accuracy of the method. [less ▲]

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See detailElastic meson nucleon and nucleon nucleon scattering: Models vs. all available data
Martynov, E.; Cudell, Jean-René ULg; Lengyel, A.

in Nicolescu, B. (Ed.) 11th International Conference On Elastic And Diffractive Scattering: Towards High Energy Frontiers: The 20th Anniversary Of The Blois Workshops (2005)

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See detailElastic properties of the oesophageal wall in the dynamic measurement of intrathoracic pressure in cattle
Lekeux, Pierre ULg; Hajer, R.; Breukink, H. J.

in Research in Veterinary Science (1984), 37(3), 366-367

The elastance of the midthoracic portion of the oesophagus was measured in 14 healthy Dutch Friesians. These were divided into three groups with mean ages of six, 126 and 1636 days, respectively. Mean ... [more ▼]

The elastance of the midthoracic portion of the oesophagus was measured in 14 healthy Dutch Friesians. These were divided into three groups with mean ages of six, 126 and 1636 days, respectively. Mean elastance was 0.17, 0.10 and 0.06 kPa ml-1, respectively. The calculated percentage of error, in relating the endoesophageal pressure with that in the thorax, was found to be smaller than 1 per cent for each animal. [less ▲]

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See detailElastic vector-meson production at HERA
Cudell, Jean-René ULg; Royen, I.

in Physics Letters B (1997), 397

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See detailAn Elastic-visco-plastic Damage Model: from Theory to Application
Wang, X. C.; Habraken, Anne ULg

in Journal de Physique IV (1996, October), 6

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See detailElasticité
Debongnie, Jean-François ULg

Book published by DEBONGNIE (Jean-François) (2011)

Mathematical preliminaries. Kinematics of a deformable body. Virtual work principle. Hyperelastic bodies. Linear elasticity. Torsion of prismatic beams. Boussinesq's problem. Hertz problem. Variational ... [more ▼]

Mathematical preliminaries. Kinematics of a deformable body. Virtual work principle. Hyperelastic bodies. Linear elasticity. Torsion of prismatic beams. Boussinesq's problem. Hertz problem. Variational principles. Plane elasticity. Technical beam theory. Theory of plates. External energetical theorems. Influence diagrams. Stability of elastic systems. Elasticity equations in curvilinear coordinates. [less ▲]

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See detailElasto-inertial turbulence in polymeric flows
Terrapon, Vincent ULg; Dubief, Yves; Soria, Julio

Conference (2013, November 26)

The dynamics of elasto-inertial turbulence (EIT) is investigated numerically from the perspective of the coupling between polymer dynamics and flow structures. In particular, direct numerical simulations ... [more ▼]

The dynamics of elasto-inertial turbulence (EIT) is investigated numerically from the perspective of the coupling between polymer dynamics and flow structures. In particular, direct numerical simulations of channel flow with Reynolds numbers ranging from 1000 to 6000 are used to study the formation and dynamics of elastic instabilities and their effects on the flow. Based on the splitting of the pressure into inertial and polymeric contributions, it is shown that the trains of cylindrical structures around thin sheets of high polymer extension that are characteristics to elasto-inertial turbulence are mostly driven by polymeric contributions. [less ▲]

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See detailElasto-plastic material parameter identification by inverse methods: sensitivity matrix calculation
Cooreman, Steven; Bouffioux, Chantal ULg; Lecompte, David et al

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

Inverse methods offer a powerful tool for the determination of the elasto-plastic material properties. Contrary to standard tests, these methods can deal with heterogeneous stress and strain-fields which ... [more ▼]

Inverse methods offer a powerful tool for the determination of the elasto-plastic material properties. Contrary to standard tests, these methods can deal with heterogeneous stress and strain-fields which have a larger information contents and hence allow the simultaneous identification of several material parameters. Moreover, it is expected that the obtained material parameters are more accurate, since these heterogeneous deformation fields are much closer to those occurring in real (metal) forming operations. The principle of the inverse method for the identification of material parameters presented in this paper is to compare an experimentally measured strain field to that computed by a Finite Element (FE) model. The material parameters in the FE model are iteratively tuned in such a way that both strain fields match each other as close as possible. One of the building blocks in this identification procedure is the updating algorithm for the material parameters in the FE model. The key problem of this updating algorithm is the determination of the sensitivity matrix, which expresses the sensitivities of the strains with respect to the material parameters. This paper presents an analytical method for the calculation of this sensitivity matrix in case of simple tensile tests. [less ▲]

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See detailAn elasto-viscoplastic model for chalk including suction effects
Collin, Frédéric ULg; De Gennaro, Vincenzo; Delage, Pierre et al

in Toll, David (Ed.) Unsaturated Soils: Advances in Geo-Engineering (2008)

During the six years long Pasachalk project devoted to the mechanical behaviour of high porosity chalks from North Sea oilfields, the constitutive model Pasachalk (Collin et al., 2002) was proposed based ... [more ▼]

During the six years long Pasachalk project devoted to the mechanical behaviour of high porosity chalks from North Sea oilfields, the constitutive model Pasachalk (Collin et al., 2002) was proposed based on the Barcelona Basic Model (BBM) (Alonso et al., 1990). The approach was based on the similarities found between the oil-water interactions (oil and water being the non wetting and wetting fluid respectively) in oil reservoir chalk and the air-water interactions in unsaturated soils. This approach appeared to be relevant to in-terpret the subsidence of the seafloor during waterflooding operations for enhanced oil recovery that has been observed in North Sea oilfields (e.g. Ekofisk oilfield). Another important component of subsidence was then related to the creep behaviour of the multiphase chalk (De Gennaro et al., 2003). A modified Pasachalk model was proposed to account for time effects using the framework of Perzyna’s viscoplasticity (1964) but without considering suction effects. Based on available experimental results (Priol et al., 2007), a modified version of the viscoplastic Pasachalk model including suction effects is proposed in this paper. [less ▲]

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See detailAn elasto-viscoplastic model for forging steel at high temperatures
Charles, J.-F.; Habraken, Anne ULg; Lecomte-Beckers, Jacqueline ULg

in Proceedings of NUMIFORM 98, Simulation of Materials Processing : Theory, Methods and Applications (1998)

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See detailElastoplastic anisotropic model based on texture analysis to simulate steel sheet behavior
Duchene, Laurent ULg; Habraken, Anne ULg; Cescotto, Serge ULg

in 7th International Symposium on Plasticity (1999)

Detailed reference viewed: 8 (4 ULg)