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See detailElastin density: Link between histological and biomechanical properties of vaginal tissue in women with pelvic organ prolapse?
DE LANDSHEERE, Laurent ULg; Brieu, Mathias; Blacher, Silvia ULg et al

in International Urogynecology Journal & Pelvic Floor Dysfunction (2016)

INTRODUCTION AND HYPOTHESIS: The aim of the study was to correlate histological and biomechanical characteristics of the vaginal wall in women with pelvic organ prolapse (POP). METHODS: Tissue samples ... [more ▼]

INTRODUCTION AND HYPOTHESIS: The aim of the study was to correlate histological and biomechanical characteristics of the vaginal wall in women with pelvic organ prolapse (POP). METHODS: Tissue samples were collected from the anterior [point Ba; POP Questionnaire (POP-Q)] and/or posterior (point Bp; POP-Q) vaginal wall of 15 women who underwent vaginal surgery for POP. Both histological and biomechanical assessments were performed from the same tissue samples in 14 of 15 patients. For histological assessment, the density of collagen and elastin fibers was determined by combining high-resolution virtual imaging and computer-assisted digital image analysis. For biomechanical testing, uniaxial tension tests were performed to evaluate vaginal tissue stiffness at low (C0) and high (C1) deformation rates. RESULTS: Biomechanical testing highlights the hyperelastic behavior of the vaginal wall. At low strains (C0), vaginal tissue appeared stiffer when elastin density was low. We found a statistically significant inverse relationship between C0 and the elastin/collagen ratio (p = 0.048) in the lamina propria. However, at large strain levels (C1), no clear relationship was observed between elastin density or elastin/collagen ratio and stiffness, likely reflecting the large dispersion of the mechanical behavior of the tissue samples. CONCLUSION: Histological and biomechanical properties of the vaginal wall vary from patient to patient. This study suggests that elastin density deserves consideration as a relevant factor of vaginal stiffness in women with POP. [less ▲]

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See detailElasto-capillarity in insect fibrillar adhesion
Gernay, Sophie-Marie ULg; Federle, Walter; Lambert, Pierre et al

in Journal of the Royal Society, Interface (2016), 13(121),

The manipulation of microscopic objects is challenging because of high adhesion forces, which render macroscopic gripping strategies unsuitable. Adhesive footpads of climbing insects could reveal ... [more ▼]

The manipulation of microscopic objects is challenging because of high adhesion forces, which render macroscopic gripping strategies unsuitable. Adhesive footpads of climbing insects could reveal principles relevant for micro-grippers, as they are able to attach and detach rapidly during locomotion. However, the underlying mechanisms are still not fully understood. In this work, we characterize the geometry and contact formation of the adhesive setae of dock beetles (Gastrophysa viridula) by interference reflection microscopy. We compare our experimental results to the model of an elastic beam loaded with capillary forces. Fitting the model to experimental data yielded not only estimates for seta adhesion and compliance in agreement with previous direct measurements, but also previously unknown parameters such as the volume of the fluid meniscus and the bending stiffness of the tip. In addition to confirming the primary role of surface tension for insect adhesion, our investigation reveals marked differences in geometry and compliance between the three main kinds of seta tips in leaf beetles. [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 detailElastocapillarity in Dock Beetle Adhesion
Gernay, Sophie-Marie ULg; Federle, Walter; Lambert, Pierre et al

Poster (2016, September)

Miniaturization is currently limited by our ability to manipulate micrometer-sized objects. Insect adhesion is an advantageous bio-inspired solution to this problem, although it is not fully understood ... [more ▼]

Miniaturization is currently limited by our ability to manipulate micrometer-sized objects. Insect adhesion is an advantageous bio-inspired solution to this problem, although it is not fully understood yet. Interference Reflection Microscopy images of the beetle Gastrophysa Viridula adhesive structures in contact with a smooth substrate were analyzed. The results were cross-linked with an analytical model of an elastic beam deflected by a liquid meniscus. By fitting the unknown model parameters to the experimental data, we obtained information about the elastic properties of the structures, the liquid volume in the bridge, and the resulting adhesion levels. [less ▲]

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See detailElastocapillarity in insect adhesion: IRM investigation
Gernay, Sophie-Marie ULg; Federle, Walter; Lambert, Pierre et al

Conference (2015, June)

The feet of many insects are covered with dense arrays of micrometric hair-like structures called setae. Liquid capillary bridges formed at the tip of these slender structures are responsible for the ... [more ▼]

The feet of many insects are covered with dense arrays of micrometric hair-like structures called setae. Liquid capillary bridges formed at the tip of these slender structures are responsible for the controlled adhesion of the insect on a large variety substrates. The resulting adhesion force is very efficient: it can exceed several times the body weight of the insect and yet vanish in a few milliseconds for fast detachment. The high aspect-ratio of setae suggests that flexibility is a key ingredient in this capillary-based adhesion mechanism. There is indeed a strong coupling between their elastic deformation and the shape of the liquid meniscus. In this experimental work, we observe and quantify the local deflection of dock beetle (Gastrophysa viridula) seta tips under perpendicular loading using interference reflection microscopy (IRM). Our results are then interpreted in the light of an analytic model of elastocapillarity through which we gain information about the optimal regime that these insects target. [less ▲]

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See detailElastocapilllarity in insect adhesion: the case of beetle adhesive hairs
Gernay, Sophie-Marie ULg; Federle, Walter; Lambert, Pierre et al

Conference (2014, November)

The feet of many insects are covered with dense arrays of hair-like structures called setae. Liquid capillary bridges at the tip of these micrometric structures are responsible for the controlled adhesion ... [more ▼]

The feet of many insects are covered with dense arrays of hair-like structures called setae. Liquid capillary bridges at the tip of these micrometric structures are responsible for the controlled adhesion of the insect on a large variety of substrates. The resulting adhesion force can exceed several times the body weight of the insect. The high aspect-ratio of setae suggests that flexibility is a key ingredient in this capillary-based adhesion mechanism. There is indeed a strong coupling between their elastic deformation and the shape of the liquid meniscus. In this experimental work, we observe and quantify the local deflection of dock beetle seta tips under perpendicular loading using interference microscopy. Our results are then interpreted in the light of an analytic model of elastocapillarity. [less ▲]

Detailed reference viewed: 20 (1 ULg)
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See detailElastofibrome dorsal
TOMASELLA, Marco ULg

Conference (2009, December 14)

Detailed reference viewed: 10 (0 ULg)
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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)

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See detailAn elastoplastic model with combined isotropic–kinematic hardening to predict the cyclic behavior of stiff clays
Hong, P.Y.; Pereira, J.M.; Cui, Y.J et al

in Computers and Geotechnics (2014)

Detailed reference viewed: 33 (5 ULg)
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See detailELBW Infants Benefit More of Optimized Nutritional Supply
SENTERRE, Thibault ULg; Habibi, F; Rigo, J

in Pediatric Academic Societies and Asian Society for Pediatric Research Joint Meeting (2011)

Detailed reference viewed: 20 (0 ULg)
See detaileLearning : Definitions, Illustrations and Added-value for University Teaching
Poumay, Marianne ULg

Scientific conference (2006, November 09)

Detailed reference viewed: 24 (0 ULg)
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See detaileLearning COLEACP : un dispositif de formation au service des professionnels du secteur agricole en Afrique
Prunier, Emmanuelle; Le Hung, Florian; Schiffers, Bruno ULg

in ELearning Africa 2014 - Book of Abstracts (2014)

Le dispositif de formation à distance du COLEACP (Comité de Liaison Europe-Afrique-Caraïbes-Pacifique) est une composante d'un système complet de formation dédié au renforcement des capacités des ... [more ▼]

Le dispositif de formation à distance du COLEACP (Comité de Liaison Europe-Afrique-Caraïbes-Pacifique) est une composante d'un système complet de formation dédié au renforcement des capacités des opérateurs des filières agricoles des pays ACP (Afrique Caraïbes et Pacifique). [less ▲]

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See detailL'eLearning dans votre entreprise
Poumay, Marianne ULg; Philippart, Sophie ULg

Conference given outside the academic context (2007)

Detailed reference viewed: 25 (3 ULg)
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See detaileLearning et évaluation formative, un mariage heureux
Van de Poël, Jean-François ULg

Conference (2011, November)

Cette présentation était destinée à démontrer en quoi les outils eLearning pouvaient être mis au service des démarches d'évaluation formative mises en oeuvre par les enseignants.

Detailed reference viewed: 38 (2 ULg)
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See detailL'eLearning et les femmes : retour d'expérience. Une étude exploratoire auprès de 22 femmes
Lesire, Catherine ULg; Géron, Stéphanie ULg; Georges, François ULg

in Paliard, C.; Nkambou, R.; Narce, C. (Eds.) et al Actes du 8ème Colloque Technologies de l’Information et de la Communication pour l’Enseignement: Intégration Technologique et Nouvelles Perspectives d’Usage (2012, December)

Who are the women who learn online ? Why and in which circumstances have they chosen to learn online ? Have they taken advantage of this experience ? In this article, we speak about the exploratory survey ... [more ▼]

Who are the women who learn online ? Why and in which circumstances have they chosen to learn online ? Have they taken advantage of this experience ? In this article, we speak about the exploratory survey carried out with 22 women to know their motivation in online courses, what they did during those courses and what they remember of their experience. We also wanted to know whether eLearning gave women the opportunity to learn and to be trained even when they have a lot of responsabilities and sometimes little time to learn. [less ▲]

Detailed reference viewed: 121 (17 ULg)