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See detailOn Conducting Burden-of-Osteoporosis Studies: A Review of the Core Concepts and Practical Issues. A Study Carried out under the Auspices of a Who Collaborating Center
Ben Sedrine, Wafa ULg; Radican, L.; Reginster, Jean-Yves ULg

in Rheumatology (2001), 40(1), 7-14

Osteoporosis is a problem that is relevant to public health from the clinical, economic and social viewpoints. Except in a handful of industrialized countries, there is a considerable void in our ... [more ▼]

Osteoporosis is a problem that is relevant to public health from the clinical, economic and social viewpoints. Except in a handful of industrialized countries, there is a considerable void in our knowledge of the magnitude of the problem. By exploring both the epidemiological and the economic impact of osteoporosis and the fractures associated with it in a particular country, studies of the 'burden of illness' (BOI) can fill that void. BOI analysis raises many questions at both the conceptual and the practical level. The purpose of this paper is to review the methodology underlying analyses of this type, to discuss its limitations and to provide a general format to improve their implementation in the field of osteoporosis. Investigators involved in BOI analysis should be very clear and explicit regarding the methods they adopt, so that studies in different countries can be interpreted and compared appropriately by interested parties. [less ▲]

Detailed reference viewed: 69 (6 ULg)
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See detailOn conspiracism as part of populist ideology
Jamin, Jérôme ULg

Conference (2003)

Detailed reference viewed: 18 (0 ULg)
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See detailOn Damage Characterization of a Steel Sheet
Guzmán Inostroza, Carlos Felipe ULg; Habraken, Anne ULg

Poster (2014, December)

Ductile damage is a physical phenomena which involves progressive deterioration of mechanical properties of metals, when undergoing high deformations. Compared to plasticity, the physical mechanisms ... [more ▼]

Ductile damage is a physical phenomena which involves progressive deterioration of mechanical properties of metals, when undergoing high deformations. Compared to plasticity, the physical mechanisms behind damage are more complex and the microscale is not longer negligible. In mathematical damage models, founding an optimal set of material parameters can be a hard task due to the strong coupling and non-linearity of the equations. An identification strategy is then crucial to arrive to a general set of parameters. Therefore, we address the fully characterization of a ferritic steel sheet, involving the elasto-plastic and damage parameters. This poster presents an hybrid experimental-numerical procedure, coupling numerical simulations, optimization algorithms and digital image correlation measurements, over a set of representative experimental and numerical results of tensile, shear and plane strain tests in different material directions. Due to the small thickness of the sheet, the constitutive model is very prone to localization into a shear band difficulting the damage parameters identification. It is found that a porosity induced inhomogeneity plus a mixed hardening can delay localization and represent the entire deformation range of the tests, leading to acceptable results. Different set of parameters are also obtained and then validated with experimental results. This localization phenomena should be carefully considered in applications involving complex strain paths. [less ▲]

Detailed reference viewed: 26 (7 ULg)
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See detailOn defining educational objectives
de Landsheere, Gilbert ULg; de Landsheere, Viviane ULg

in Evaluation in Education. International Progress (1977), (1), 73-190

Detailed reference viewed: 30 (0 ULg)
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See detailOn Deriving a Hybrid Model for Carbohydrate Uptake in Escherichia Coli
Bullinger, Eric ULg; Sauter, T.; Allgöwer, F. et al

in Proc. 15th IFAC World Congress (2002)

Detailed reference viewed: 9 (0 ULg)
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See detailOn destabilizing implicit factors in discrete advection-diffusion equations
Beckers, Jean-Marie ULg

in Journal of Computational Physics (1994), 111(2), 260-265

In the present paper, we find necessary and sufficient stability conditions for a simple one-time step finite difference discretization of an N-dimensional advection-diffusion equation. Furthermore, it is ... [more ▼]

In the present paper, we find necessary and sufficient stability conditions for a simple one-time step finite difference discretization of an N-dimensional advection-diffusion equation. Furthermore, it is shown that when the implicit factors differ in each direction, a strange behavior occurs: By increasing one implicit factor in only one direction, a stable scheme can become unstable. It is thus suggested to use a single implicit direction (for efficient computing), or the same implicit factor in each direction. (C) 1994 Academic Press, Inc. [less ▲]

Detailed reference viewed: 32 (5 ULg)
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See detailOn Dictatorship, Economic Development and Stability
Artige, Lionel ULg

Conference (2004, April)

Detailed reference viewed: 36 (2 ULg)
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See detailOn dictatorship, economic development and stability
Artige, Lionel ULg

Conference (2003, March)

Detailed reference viewed: 34 (4 ULg)
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See detailOn different types of adjustment usable to calculate the parameters of the stream power law
Demoulin, Alain ULg; Beckers, Arnaud ULg; Bovy, Benoît ULg

in Geomorphology (2012), 138(1), 203-208

Model parameterization through adjustment to field data is a crucial step in the modeling and the understanding of the drainage network response to tectonic or climatic perturbations. Using as a test case ... [more ▼]

Model parameterization through adjustment to field data is a crucial step in the modeling and the understanding of the drainage network response to tectonic or climatic perturbations. Using as a test case a data set of 18 knickpoints that materialize the migration of a 0.7-Ma-old erosion wave in the Ourthe catchment of northern Ardennes (western Europe), we explore the impact of various data fitting on the calibration of the stream power model of river incision, from which a simple knickpoint celerity equation is derived. Our results show that statistical least squares adjustments (or misfit functions) based either on the streamwise distances between observed and modeled knickpoint positions at time t or on differences between observed and modeled time at the actual knickpoint locations yield significantly different values for the m and K parameters of the model. As there is no physical reason to prefer one of these approaches, an intermediate least-rectangles adjustment might at first glance appear as the best compromise. However, the statistics of the analysis of 200 sets of synthetic knickpoints generated in the Ourthe catchment indicate that the timebased adjustment is the most capable of getting close to the true parameter values. Moreover, this fitting method leads in all cases to an m value lower than that obtained from the classical distance adjustment (for example, 0.75 against 0.86 for the real case of the Ourthe catchment), corresponding to an increase in the non-linear character of the dependence of knickpoint celerity on discharge [less ▲]

Detailed reference viewed: 131 (14 ULg)
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See detailOn differential passivity of physical systems
Forni, Fulvio ULg; Sepulchre, Rodolphe ULg; van der Schaft, Arjan

in 52nd IEEE Conference on Decision and Control (2013)

Differential passivity is a property that allows to check with a pointwise criterion that a system is incrementally passive, a property that is relevant to study interconnected systems in the context of ... [more ▼]

Differential passivity is a property that allows to check with a pointwise criterion that a system is incrementally passive, a property that is relevant to study interconnected systems in the context of regulation, synchronization, and estimation. The paper investigates how restrictive is the property, focusing on a class of open gradient systems encountered in the coenergy modeling framework of physical systems, in particular the Brayton-Moser formalism for nonlinear electrical circuits. [less ▲]

Detailed reference viewed: 41 (4 ULg)
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See detailOn differentially dissipative dynamical systems
Forni, Fulvio ULg; Sepulchre, Rodolphe ULg

in IFAC-PapersOnLine website. (2013)

Dissipativity is an essential concept of systems theory. The paper provides an extension of dissipativity, named differential dissipativity, by lifting storage functions and supply rates to the tangent ... [more ▼]

Dissipativity is an essential concept of systems theory. The paper provides an extension of dissipativity, named differential dissipativity, by lifting storage functions and supply rates to the tangent bundle. Differential dissipativity is connected to incremental stability in the same way as dissipativity is connected to stability. It leads to a natural formulation of differential passivity when restricting to quadratic supply rates. The paper also shows that the interconnection of differentially passive systems is differentially passive, and provides preliminary examples of differentially passive electrical systems. [less ▲]

Detailed reference viewed: 70 (9 ULg)
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See detailOn Disgust and the Curse of Matter
Delville, Michel ULg

Conference (2013, May 23)

Detailed reference viewed: 5 (0 ULg)
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See detailOn drawing a line through the spectrogram: how do we understand deficits of vocal pitch imitation?
Pfordresher, Peter; Larrouy, Pauline ULg

in Frontiers in Human Neuroscience (2015), 9

In recent years there has been a remarkable increase in research focusing on deficits of pitch production in singing. A critical concern has been the identification of “poor pitch singers,” which we refer ... [more ▼]

In recent years there has been a remarkable increase in research focusing on deficits of pitch production in singing. A critical concern has been the identification of “poor pitch singers,” which we refer to more generally as individuals having a “vocal pitch imitation deficit.” The present paper includes a critical assessment of the assumption that vocal pitch imitation abilities can be treated as a dichotomy. Though this practice may be useful for data analysis and may be necessary within educational practice, we argue that this approach is complicated by a series of problems. Moreover, we argue that a more informative (and less problematic) approach comes from analyzing vocal pitch imitation abilities on a continuum, referred to as effect magnitude regression, and offer examples concerning how researchers may analyze data using this approach. We also argue that the understanding of this deficit may be better served by focusing on the effects of experimental manipulations on different individuals, rather than attempt to treat values of individual measures, and isolated tasks, as absolute measures of ability. [less ▲]

Detailed reference viewed: 31 (0 ULg)
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See detailOn early land plants, including Cooksonia from Southern Gondwana
Gerrienne, Philippe ULg; Bergamaschi, S.; Pereira, E. et al

Conference (1999)

Detailed reference viewed: 15 (0 ULg)
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See detailOn endostyle ultrastructure in two new species of doliolid-like tunicates
Compère, Philippe ULg; Godeaux, Jean ULg

in Marine Biology (1997), 128

Detailed reference viewed: 14 (4 ULg)
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See detailOn Extended Finite Element Method (XFEM) for modelling of organ deformations associated with surgical cuts
Vigneron, Lara M.; Warfield, Simon K.; Verly, Jacques ULg

Conference (2004)

Detailed reference viewed: 8 (2 ULg)
See detailOn Forms and Functions: Studies in Ancient Egyptian Grammar
Grossman, Eitan; Polis, Stéphane ULg; Stauder, Andréas et al

Book published by Widmaier Verlag (2014)

This volume is the outcome of a workshop on ancient Egyptian syntax held in Liège in 2011. The contributions deal with several central topics in syntactic analyses – like coordination, raising, gradience ... [more ▼]

This volume is the outcome of a workshop on ancient Egyptian syntax held in Liège in 2011. The contributions deal with several central topics in syntactic analyses – like coordination, raising, gradience or non-expression of participants –, but also investigate the relationship between syntax stricto sensu and other fields, from morphology to pragmatics (with a special attention to construction types and grammaticalization processes). The studies cover the whole Ancient Egyptian corpus, from Old Egyptian down to Coptic, with a striking common concern, which is to relate systematically the formal dimension to the functional one. Thereby, the papers go beyond the descriptive level and address numerous stimulating ‘why?’ questions. [less ▲]

Detailed reference viewed: 44 (0 ULg)
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See detailOn generalized Hölder spaces
Kreit, Damien ULg; Nicolay, Samuel ULg

Poster (2011, June)

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis and lead to natural ... [more ▼]

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis and lead to natural definitions of the notion of fractal function; for example a function belonging to $C^\alpha$ with $\alpha\in (0,1)$ typically has a fractal graph. The purpose of this poster is to present a generalization of such spaces as well as some recent results about their characterizations. [less ▲]

Detailed reference viewed: 115 (20 ULg)
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See detailOn generalized Hölder spaces
Kreit, Damien ULg

Conference (2011, January 21)

Detailed reference viewed: 15 (4 ULg)
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See detailOn generalized Hölder-Zygmund spaces
Kreit, Damien ULg; Nicolay, Samuel ULg

Poster (2013, October 29)

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis. The purpose of this ... [more ▼]

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis. The purpose of this poster is to present a generalization of such spaces as well as some recent results about their characterizations. These spaces are a particular case of a generalization of Besov Spaces who have recently been extensively studied. [less ▲]

Detailed reference viewed: 40 (6 ULg)