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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: 33 (5 ULg) On Dictatorship, Economic Development and StabilityArtige, Lionel Conference (2004, April)Detailed reference viewed: 37 (2 ULg) On dictatorship, economic development and stabilityArtige, Lionel Conference (2003, March)Detailed reference viewed: 35 (4 ULg) On different types of adjustment usable to calculate the parameters of the stream power lawDemoulin, Alain ; Beckers, Arnaud ; Bovy, Benoît in Geomorphology (2012), 138(1), 203-208Model 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: 134 (14 ULg) On differential passivity of physical systemsForni, Fulvio ; Sepulchre, Rodolphe ; van der Schaft, Arjanin 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) On differentially dissipative dynamical systemsForni, Fulvio ; Sepulchre, Rodolphe 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: 71 (9 ULg) On Disgust and the Curse of MatterDelville, Michel Conference (2013, May 23)Detailed reference viewed: 6 (0 ULg) On drawing a line through the spectrogram: how do we understand deficits of vocal pitch imitation?Pfordresher, Peter; Larrouy, Pauline in Frontiers in Human Neuroscience (2015), 9In 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: 34 (0 ULg) On early land plants, including Cooksonia from Southern GondwanaGerrienne, Philippe ; Bergamaschi, S.; Pereira, E. et alConference (1999)Detailed reference viewed: 19 (0 ULg) On endostyle ultrastructure in two new species of doliolid-like tunicatesCompère, Philippe ; Godeaux, Jean in Marine Biology (1997), 128Detailed reference viewed: 15 (4 ULg) On Extended Finite Element Method (XFEM) for modelling of organ deformations associated with surgical cutsVigneron, Lara M.; Warfield, Simon K.; Verly, Jacques Conference (2004)Detailed reference viewed: 9 (2 ULg) On Forms and Functions: Studies in Ancient Egyptian GrammarGrossman, Eitan; Polis, Stéphane ; Stauder, Andréas et alBook 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: 59 (0 ULg) On functional and structural heterogeneity of VIM-type metallo-beta-lactamasesDocquier, J. D.; Lamotte-Brasseur, J.; Galleni, Moreno et alin Journal of Antimicrobial Chemotherapy (2003), 51(2), 257-266The VIM metallo-beta-lactamases are emerging resistance determinants, encoded by mobile genetic elements, that have recently been detected in multidrug-resistant nosocomial isolates of Pseudomonas ... [more ▼]The VIM metallo-beta-lactamases are emerging resistance determinants, encoded by mobile genetic elements, that have recently been detected in multidrug-resistant nosocomial isolates of Pseudomonas aeruginosa and other Gram-negative pathogens. In this work a T7-based expression system for overproduction of the VIM-2 enzyme by Escherichia coli was developed, which yielded similar to80 mg of protein per litre of culture. The enzyme was mostly released into the medium, from which it was recovered at >99% purity by an initial ammonium sulphate precipitation followed by two chromatography steps, with almost 80% efficiency. Determination of kinetic parameters of VIM-2 under the same experimental conditions previously used for VIM-1 (the first VIM-type enzyme detected in clinical isolates, which is 93% identical to VIM-2) revealed significant differences in K-m values and/or turnover rates with several substrates, including penicillins, cephalosporins and carbapenems. Compared with VIM-1, VIM-2 is more susceptible to inactivation by chelators, indicating that the zinc ions of the latter are probably more loosely bound. These data indicated that at least some of the amino acid differences between the two proteins have functional significance. Molecular modelling of the two enzymes identified some amino acid substitutions, including those at positions 223, 224 and 228 (in the BBL numbering), that could be relevant to the changes in catalytic behaviour. [less ▲]Detailed reference viewed: 15 (0 ULg) On generalized Hölder spacesKreit, Damien; Nicolay, Samuel Conference (2015, September 24)We introduce generalized pointwise Hölder spaces as the point wise version of generalized uniform Hölder spaces. These last ones can be seen as a special case of generalized Besov spaces.Detailed reference viewed: 16 (1 ULg) On generalized Hölder spacesKreit, Damien ; Nicolay, Samuel 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: 119 (20 ULg) On generalized Hölder spacesKreit, Damien Conference (2011, January 21)Detailed reference viewed: 15 (4 ULg) On generalized Hölder-Zygmund spacesKreit, Damien ; Nicolay, Samuel 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: 42 (6 ULg) On Glocal Subjectivities and Perspectives in Shaun Tan’s 'The Arrival'Dony, Christophe Conference (2011)Detailed reference viewed: 21 (2 ULg) On going study of treated and non-treated corundum samplesCalvo Del Castillo, Helena ; Chene, Grégoire ; Dupuis, Thomas et alConference (2009)Detailed reference viewed: 17 (3 ULg)