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See detailDiscrete symmetries in the three-Higgs-doublet model
Ivanov, Igor ULg; Vdovin, Evgeny

in Physical Review. D : Particles and Fields (2012), 86(9), 0950305

N-Higgs-doublet models (NHDM) are among the most popular examples of electroweak symmetry breaking mechanisms beyond the Standard Model. Discrete symmetries imposed on the NHDM scalar potential play a ... [more ▼]

N-Higgs-doublet models (NHDM) are among the most popular examples of electroweak symmetry breaking mechanisms beyond the Standard Model. Discrete symmetries imposed on the NHDM scalar potential play a pivotal role in shaping the phenomenology of the model, and various symmetry groups have been studied so far. However, in spite of all efforts, the classification of finite Higgs-family symmetry groups realizable in NHDM for any N>2 is still missing. Here, we solve this problem for the three-Higgs-doublet model by making use of Burnside’s theorem and other results from pure finite group theory which are rarely exploited in physics. Our method and results can also be used beyond high-energy physics, for example, in the study of possible symmetries in three-band superconductors. [less ▲]

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See detailDiscrete Valued Optimal Design Problems
Fleury, Claude ULg

in Bendsoe, Martin P.; Mota Soares, Carlos A. (Eds.) Topology design of structures: Proceedings of the NATO Advanced Workshop, Sesimbra, Portugal, June 20-26, 1992 (1992)

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See detailDiscrete Vortex Simulations of the torsional flutter oscillations of a 4:1 rectangular cylinder
Andrianne, Thomas ULg; Dimitriadis, Grigorios ULg

in Proceedings of the 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference (2012, April 24)

This work presents aeroelastic simulations of a 2D bluff-body around its pitching degree of freedom. The numerical tool consists in an aerodynamic solver based on the Discrete Vortex Method (DVM), coupled ... [more ▼]

This work presents aeroelastic simulations of a 2D bluff-body around its pitching degree of freedom. The numerical tool consists in an aerodynamic solver based on the Discrete Vortex Method (DVM), coupled with a linear structural model. The shape of the bluff-body is a sharp edged rectangular cylinder with a side ratio equal to 4. The numerical results are compared to the experimental measurements recently obtained by the authors.8 The validation is carried out in three steps: first the frequency content of the flow-field in the wake of the static body is investigated. Then the simulated unsteady flow-field around the imposed pitching motion of the body is compared to experimental flow visualizations. This comparison is performed using Proper Orthogonal Decomposition (POD). Finally, the simulation of the global aeroelastic behaviour, based on the coupling of the DVM code to the structural model of the pitching degree of freedom is carried out and the results are compared to measured aeroelastic responses.. Very good agreements are found between numerical and experimental results, demonstrating the capabilities of the numerical tool to simulate complex unsteady aerodynamics around an oscillating bluff-body. [less ▲]

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See detailDiscrete-time synchronization on the N-torus
Sarlette, Alain ULg; Sepulchre, Rodolphe ULg; Leonard, Naomi

in Proceedings of the 17th MTNS Symposium, Kyoto 2006 (2006, August)

In this paper, we study the behavior of a discrete-time network of N agents, each evolving on the circle. The global convergence analysis on the N-torus is a distinctive feature of the present work with ... [more ▼]

In this paper, we study the behavior of a discrete-time network of N agents, each evolving on the circle. The global convergence analysis on the N-torus is a distinctive feature of the present work with respect to previous synchronization results that have focused on convergence in the Euclidean space (R^n)^N. We address the question from a control perspective, but make several connections with existing models, including the Hopfield network, the Vicsek model and the (continuous-time) Kuramoto model. We propose two different distributed algorithms. The first one achieves convergence to equilibria in shape space that are the local extrema of a potential U_L built on the graph Laplacian associated to a fixed, undirected interconnection topology; it can be implemented with sensor-based interaction only, since each agent just relies on the relative position of its neighbors. The second one achieves synchronization under varying and/or directed communication topology using local estimates of a consensus variable that are communicated between interacting agents. Both algorithms are based on the notion of centroid and can be interpreted as descent algorithms. The proposed approach can be extended to other embedded compact manifolds. [less ▲]

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See detailDiscrete-time synchronization on the N-torus
Sarlette, Alain ULg; Sepulchre, Rodolphe ULg

Conference (2006, March)

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See detailThe Discretionary Use of Strasbourg Jurisprudence by the International Criminal Court
Deprez, Christophe ULg

Conference (2014, June 13)

Although the case law of the European Court of Human Rights ("ECtHR") has had and still shows critical influence on the development of the practice of the International Criminal Court ("ICC"), it remains ... [more ▼]

Although the case law of the European Court of Human Rights ("ECtHR") has had and still shows critical influence on the development of the practice of the International Criminal Court ("ICC"), it remains unclear what the authority of such external jurisprudence is vis-à-vis the international criminal judge. While it is virtually undisputed that human rights law, in general terms, is applicable to proceedings before the ICC, many scholars tend to adopt a much nuanced approach to the authority of human rights case law in particular. This paper aims to shed further light on the issue by addressing the question whether ICC judges have used Strasbourg jurisprudence in a consistent manner, in particular as regards the authority which they decided to vest the latter with. It demonstrates that ICC Chambers have relied on European human rights practice, alternatively, as a mere source of inspiration, as binding interpretation, as a corpus having ambivalent authority, or as a source whose legal value it simply left unspecified. This leads us to conclude that, on the whole, the ICC has been mostly inconsistent regarding the value of ECtHR case law in the context of international criminal proceedings. Such inconsistency, we argue, amounts to a discretionary use of Strasbourg jurisprudence that further reinforces the Court's paradoxical position as the ultimate authority for defining the boundaries of its own human rights constraint. [less ▲]

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See detailDiscretization of Sources of Integral Operators
Tarhasaari, T.; Kettunen, L.; Geuzaine, Christophe ULg

in IEEE Transactions on Magnetics (2000), 36(4), 659--662

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See detailDiscretization of Sources of Integral Operators
Tarhasaari, T.; Kettunen, L.; Geuzaine, Christophe ULg

in Proceedings of the 12th COMPUMAG Conference on the Computation of Electromagnetic Fields (1999)

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See detailDiscretization of the divergence formulation of the bed slope term in the shallow-water equations and consequences in terms of energy balance
Bruwier, Martin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Applied Mathematical Modelling (2016)

In this research, the influence on energy balance of the discretization scheme of the divergence formulation of the bed slope term in the shallow-water equations is analysed theoretically (for a single ... [more ▼]

In this research, the influence on energy balance of the discretization scheme of the divergence formulation of the bed slope term in the shallow-water equations is analysed theoretically (for a single topographic step) and based on two numerical tests. Different values of the main parameter controlling the discretization scheme of the divergence formulation are analysed to identify the formulation which minimizes the energy variation resulting from the discretization. For a wide range of ambient Froude numbers and relative step heights, the theoretical value of the control parameter minimizing the energy variation falls within a very narrow range, which can reasonably be approximated by a single “optimal” value. This is a result of high practical relevance for the design of accurate numerical schemes, as confirmed by the results of the numerical tests. [less ▲]

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See detailDiscretization Schemes for Hybrid Methods
Geuzaine, Christophe ULg; Tarhasaari, T.; Kettunen, L. et al

in IEEE Transactions on Magnetics (2001), 37(5), 3112--3115

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See detailDiscrets et méconnus...les reptiles
Graitson, Eric ULg

Book published by Service public de Wallonie (2011)

"En Wallonie, sept espèces de reptiles composent le « petit peuple des broussailles ». Discrets et silencieux, ils passent bien souvent inaperçus. Ils sont pourtant bien là sous une pierre, tapis dans la ... [more ▼]

"En Wallonie, sept espèces de reptiles composent le « petit peuple des broussailles ». Discrets et silencieux, ils passent bien souvent inaperçus. Ils sont pourtant bien là sous une pierre, tapis dans la végétation dense, à l’intérieur des fissures d’un muret ou sous un tas de compost, cherchant la température idéale a leur survie ou simplement un abri pour fuir leurs prédateurs." Après une présentation des différentes espèces de reptiles indigènes présentes en Wallonie, le livre aborde les causes de régression de ces animaux et les mesures de protection applicables par le monde agricole. Plusieurs exemples d'aménagements réalisés en faveur des reptiles en milieu agricole sont présentés à la fin de l'ouvrage. [less ▲]

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See detailDiscriminant analysis based on multivariate response curves: a descriptive approach to dynamic allocation.
Albert, Adelin ULg

in Statistics in Medicine (1983), 2(1), 95-106

We examine the problem of discriminating between two groups in the context of multivariate response curves observed over a specified time interval. We propose a descriptive solution for the case where one ... [more ▼]

We examine the problem of discriminating between two groups in the context of multivariate response curves observed over a specified time interval. We propose a descriptive solution for the case where one can determine the response curves by linear interpolation between successive observations. Unlike most previously reported methods that use only the current multivariate observation, our approach accounts for the history of the process. Moreover the method has the potential advantage of being applicable dynamically, as one observes the multivariate response curve. Finally, the method demonstrates simplicity and flexibility, two important features for successful, routine, clinical application. [less ▲]

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See detailDiscriminant BOLD Activation Patterns during Mental Imagery in Parkinson’s Disease
Schrouff, Jessica ULg; Cremers, Julien ULg; D'Ostilio, Kevin ULg et al

in Proceedings of MLINI 2012 (2012, December 07)

Using machine learning based models in clinical applications has become current practice and can prove useful to provide information at the subject’s level, such as predicting an (early) diagnosis or ... [more ▼]

Using machine learning based models in clinical applications has become current practice and can prove useful to provide information at the subject’s level, such as predicting an (early) diagnosis or monitoring the evolution of a disease. However, the performance of these models depends on the choice of a biomarker to detect the presence or absence of a disease. Choosing a biomarker is not straightforward, especially in the case of Parkinson’s disease when compared to healthy subjects. In the present work, we investigated the mental imagery of gait as a biomarker of Parkinson’s disease and showed that the signal in the mesencephalic locomotor region during the mental imagery of gait at a comfortable pace can discriminate significantly between idiopathic Parkinson’s disease patients and healthy subjects. Although there is room for improvement, the results of this preliminary study are promising. [less ▲]

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See detailDiscriminating between overshooting and rotational mixing in massive stars: any help from asteroseismology?
Miglio, Andrea ULg; Montalban Iglesias, Josefa ULg; Eggenberger, P. et al

in Communications in Asteroseismology (2009, July 01), 158

Chemical turbulent mixing induced by rotation can affect the internal distribution of μ near the energy-generating core of main-sequence stars, having an effect on the evolutionary tracks similar to that ... [more ▼]

Chemical turbulent mixing induced by rotation can affect the internal distribution of μ near the energy-generating core of main-sequence stars, having an effect on the evolutionary tracks similar to that of overshooting. However, this mixing also leads to a smoother chemical composition profile near the edge of the convective core, which is reflected in the behavior of the buoyancy frequency and, therefore, in the frequencies of gravity modes. We show that for rotational velocities typical of main-sequence B-type pulsating stars, the signature of a rotationally induced mixing significantly perturbs the spectrum of gravity modes and mixed modes, and can be distinguished from that of overshooting. The cases of high-order gravity modes in Slowly Pulsating B stars and of low-order g modes and mixed modes in β Cephei stars are discussed. [less ▲]

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See detailDiscriminating net ecosystem exchange between different vegetation plots in a heterogeneous forest
Aubinet, Marc ULg; Heinesch, Bernard ULg; Perrin, Dominique ULg et al

in Agricultural and Forest Meteorology (2005), 132(3-4), 315-328

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See detailDiscrimination between Alzheimer dementia and controls by automated analysis of multicenter FDG PET
Herholz, K.; Salmon, Eric ULg; Perani, D. et al

in Neuroimage (2002), 17(1), 302-316

A new diagnostic indicator of FDG PET scan abnormality, based on age-adjusted t statistics and an automated voxel-based procedure, is presented and validated in a large data set comprising 110 normal ... [more ▼]

A new diagnostic indicator of FDG PET scan abnormality, based on age-adjusted t statistics and an automated voxel-based procedure, is presented and validated in a large data set comprising 110 normal controls and 395 patients with probable Alzheimer's disease (AD) that were studied in eight participating centers. The effect of differences in spatial resolution of PET scanners was minimized effectively by filtering and masking. In controls FDG uptake declined significantly with age in anterior cingulate and frontolateral perisylvian cortex. In patients with probable AD decline of FDG uptake in posterior cingulate, temporoparietal, and prefrontal association cortex was related to dementia severity. These effects were clearly distinct from age effects in controls, suggesting that the disease process of AD is not related to normal aging. Women with probable AD had significantly more frontal metabolic impairment than men. The new indicator of metabolic abnormality in AD-related regions provided 93% sensitivity and specificity for distinction of mild to moderate probable AD from normals, and 84% sensitivity at 93% specificity for detection of very mild probable AD (defined by Mini Mental Score 24 or better). All regions related to AD severity were already affected in very mild AD, suggesting that all vulnerable areas are affected to a similar degree already at disease onset. Ventromedial frontal cortex was also abnormal. In conclusion, automated analysis of multicenter FDG PET is feasible, provides insights into AD pathophysiology, and can be used potentially as a sensitive biomarker for early AD diagnosis. (C) 2002 Elsevier Science (USA). [less ▲]

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See detailDiscrimination between Bifidobacterium species from human and animal origin by PCR-restriction fragment length polymorphism
Delcenserie, Véronique ULg; Bechoux, Nathalie ULg; Leonard, Tamara et al

in Journal of Food Protection (2004), 67(6), 1284-1288

Bifidobacteria are normal intestinal flora in humans and animals. The genus Bifidobacterium includes 31 species of significant host specificity. Taking into account their properties, we proposed to use ... [more ▼]

Bifidobacteria are normal intestinal flora in humans and animals. The genus Bifidobacterium includes 31 species of significant host specificity. Taking into account their properties, we proposed to use bifidobacteria as fecal contamination indicators. PCR-restriction fragment length polymorphism on the 16S rDNA gene was used to distinguish the different Bifidobacterium species. Sixty-four strains belonging to 13 different species were differentiated from animal or human origin using one or two restriction enzymes. Moreover, the primers used were specifics of the Bifidobacterium genus. Therefore, this method made it possible to determine both the presence of bifidobacteria in a sample and its origin of contamination. [less ▲]

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See detailDiscrimination des crânes du campagnol des champs, Microtus arvalis (Pallas) et du campagnol souterrain, Pitymys subterraneus (de Sélys Longchamps) en l'absence de mandibule
Libois, Roland ULg

in Mammalia (1979), 43(1), 99-112

1799 skulls of common vole and 535 skulls of pine voles from different Belgian populations have been studied in three aspects: i) the pattern of the nasal-frontal and premaxillary-frontal sutures. This ... [more ▼]

1799 skulls of common vole and 535 skulls of pine voles from different Belgian populations have been studied in three aspects: i) the pattern of the nasal-frontal and premaxillary-frontal sutures. This pattern is an excellent criterion by which identify the both species, and it is almost always accurate. ii) the value of ratios between a skull's height and the length of its diastema. This technique enables one to discriminate between common vole specimens with ratios above 95 % and pine vole specimens below 86%. iii) the width of the interorbital constrition. This seems to be an equally good criterion of identification, even for young animals. Hovewer, in Europe, it seems to have a clinal variation, a finding which should be verified. For the Belgium populations studied, the values for the common vole range from 2.60 to 3.50 mm (mean 3.09 mm). In the pine vole they range from 3.30 to 4.00 mm (mean 3.65 mm). [less ▲]

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