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See detailUn monde sans frontières ?
Jacquemain, Marc ULg

Article for general public (2016)

En s'appuyant sur la conception de la communauté politique chez Michael Walzer, le texte tente, très brièvement, de décrire la nature de la citoyenneté dans un monde d'Etats-Nations, les droits et les ... [more ▼]

En s'appuyant sur la conception de la communauté politique chez Michael Walzer, le texte tente, très brièvement, de décrire la nature de la citoyenneté dans un monde d'Etats-Nations, les droits et les exigences qu'elle comporte ainsi que le domaine des relations de l'Etat avec les non-citoyens [less ▲]

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See detailLes Nouveaux Liégeois. Migrations et Transformations Urbaines
Lafleur, Jean-Michel ULg; Stangherlin, Gregor

in Dérivations (2016), (3), 194-203

Dans cet article, nous proposons de discuter la migration contemporaine sur le territoire de la Ville de Liège. Cette discussion repose pour l’essentiel sur une analyse des données statistiques ... [more ▼]

Dans cet article, nous proposons de discuter la migration contemporaine sur le territoire de la Ville de Liège. Cette discussion repose pour l’essentiel sur une analyse des données statistiques disponibles et une revue de la littérature scientifique produite sur les migrations à Liège ces dernières années. Nous commençons donc par une description des grandes évolutions démographiques sur le territoire de la ville depuis 1991 pour insister ensuite sur les effets de la migration dans cinq quartiers de la ville. Cette première partie souligne le rôle essentiel que joue la migration dans la croissance démographique observée ces dix dernières années à Liège. Ensuite, nous examinons la présence étrangère sur le territoire de la ville selon les 5 dimensions fréquemment citées dans les débats sur l’intégration des populations étrangères : emploi, logement, éducation, socio-culturelle et politique. [less ▲]

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See detailRevealed preference tests of collectively rational consumption behavior: formulations and algorithms
Talla Nobibon, Fabrice; Cherchye, Laurens; Crama, Yves ULg et al

in Operations Research (2016), online

This paper focuses on revealed preference tests of the collective model of household consumption. We start by showing that the decision problems corresponding to testing collective rationality are {\sc np ... [more ▼]

This paper focuses on revealed preference tests of the collective model of household consumption. We start by showing that the decision problems corresponding to testing collective rationality are {\sc np}-complete. This makes the application of these tests problematic for (increasingly available) large(r) scale data sets. We then present two approaches to overcome this negative result. First, we introduce exact algorithms based on mixed-integer programming ({\sc mip}) formulations of the collective rationality tests, which can be usefully applied to medium sized data sets. Next, we propose simulated annealing heuristics, which allow for efficient testing of the collective model in the case of large data sets. We illustrate our methods by a number of computational experiments based on Dutch labor supply data. [less ▲]

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See detailLa Paméla de Voltaire des Lumières au XXIe siècle - changements de statut et réception générique du texte
Daubercies, Laurence ULg

in Loxias : Littératures Française et Comparées (2016)

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See detailFire Performance of Columns made of Normal and High Strength Concrete: A Comparative Analysis
Gernay, Thomas ULg

in Key Engineering Materials (2016), 711

The use of high strength concrete (HSC) in multi-story buildings has become increasingly popular. Selection of HSC over normal strength concrete (NSC) allows for reducing the dimensions of the columns ... [more ▼]

The use of high strength concrete (HSC) in multi-story buildings has become increasingly popular. Selection of HSC over normal strength concrete (NSC) allows for reducing the dimensions of the columns sections. However, this reduction has consequences on the structural performance in case of fire, as smaller cross sections lead to faster temperature increase in the section core. Besides, HSC experiences higher rates of strength loss with temperature and a higher susceptibility to spalling than NSC. The fire performance of a column can thus be affected by selecting HSC over NSC. This research performs a comparison of the fire performance of HSC and NSC columns, based on numerical simulations by finite element method. The thermal and structural analyses of the columns are conducted with the software SAFIR®. The variation of concrete strength with temperature for the different concrete classes is adopted from Eurocode. Different configurations are compared, including columns with the same load bearing capacity and columns with the same cross section. The relative loss of load bearing capacity during the fire is found to be more pronounced for HSC columns than for NSC columns. The impact on fire resistance rating is discussed. These results suggest that consideration of fire loading limits the opportunities for use of HSC, especially when the objective is to reduce the dimensions of the columns sections. [less ▲]

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See detailIntroduction au droit public - Sommaire et plan détaillé du cours (2016-17)
Bouhon, Frédéric ULg

Learning material (2016)

Ce document contient le sommaire et le plan détaillé du cours d'Introduction au droit public (DROI1101-3). Il vise à offrir aux étudiants un outil pour mieux suivre les séances de cours et structurer leur ... [more ▼]

Ce document contient le sommaire et le plan détaillé du cours d'Introduction au droit public (DROI1101-3). Il vise à offrir aux étudiants un outil pour mieux suivre les séances de cours et structurer leur prise de notes. [less ▲]

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See detailL'âge de début de l'obligation scolaire
Behrendt, Christian ULg

in Revue Belge de Droit Constitutionnel (2016), 2016

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See detailEntre traditions et innovations. La tête végétalisée dans les décors romains: origine, diffusion et signification d'un thème ornemental
Derwael, Stéphanie ULg

Doctoral thesis (2016)

La tête végétalisée est un témoin privilégié de la culture visuelle des Romains. Innovation de l’époque tardo-républicaine et proto-impériale, elle n’en demeure pas moins l’héritière du traitement formel ... [more ▼]

La tête végétalisée est un témoin privilégié de la culture visuelle des Romains. Innovation de l’époque tardo-républicaine et proto-impériale, elle n’en demeure pas moins l’héritière du traitement formel de figures telles que la Rankenfrau et le Rankengott et d’un symbolisme végétal séculaire. Elle évoque une nature naissante ou renaissante qui ne possède pas encore les frontières du cosmos ordonné, et fonctionne comme une épithète iconographique permettant de mettre en évidence un aspect particulier d’un personnage, tel le dieu Oceanus. L’étude des spécificités culturelles et des traditions iconographiques des différentes régions de l’Empire romain, couplée à la mise en série et à l’analyse contextualisée des documents, permet de mettre en évidence les formes de diffusion, de réception et d’appropriation de ce thème ornemental, de sa naissance à son assimilation par le monde chrétien. A côté de tendances relativement homogènes communes à l’Empire, se dessinent quelques courants particuliers, comme l’enrichissement nord-africain de la forme océanique, le renouveau oriental de la bordure à rinceau peuplé héritée de la tradition picturalisante hellénistique, ou « l’humanisation du végétal » gallo-germanique. Entre traditions et innovations, la tête végétalisée du monde romain développe des spécificités iconographiques pérennes qui lui confèrent une signification inhérente à toute forme d’hybridité végétale, tout en permettant à différentes visions du monde de s’exprimer en elle sans se dissoudre. [less ▲]

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See detailWill climate change affect insect pheromonal communication?
Boullis, Antoine ULg; Detrain, Claire; Francis, Frédéric ULg et al

in Current Opinion in Insect Science (2016)

Understanding how climate change will affect species interactions is a challenge for all branches of ecology. We have only limited understanding of how increasing temperature and atmospheric CO2 and O3 ... [more ▼]

Understanding how climate change will affect species interactions is a challenge for all branches of ecology. We have only limited understanding of how increasing temperature and atmospheric CO2 and O3 levels will affect pheromone-mediated communication among insects. Based on the existing literature, we suggest that the entire process of pheromonal communication, from production to behavioural response, is likely to be impacted by increases in temperature and modifications to atmospheric CO2 and O3 levels. We argue that insect species relying on long-range chemical signals will be most impacted, because these signals will likely suffer from longer exposure to oxidative gases during dispersal. We provide future directions for research programmes investigating the consequences of climate change on insect pheromonal communication. [less ▲]

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See detailTHE BEAT GENERATION Beat Generation - L’Anthologie Musicale - Hep Cats, Hipsters & Beatniks 1936-1962 (FREMEAUX & ASSOCIES)
Sacré, Robert ULg

E-print/Working paper (2016)

The Beat Generation - L’Anthologie Musicale - Compte rendu Hep Cats, Hipsters & Beatniks 1936-1962 FREMEAUX & ASSOCIES

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See detailHow reliable are the models to study recent climate change ? A study of heat/cold waves and radiative fluxes trends over 1900-2010 using the model MAR in Belgium
Wyard, Coraline ULg; Fettweis, Xavier ULg; Scholzen, Chloé ULg

Poster (2016, August 29)

This research aims to assess the ability of the regional climate model MAR ("Modèle Atmosphérique Régional") to reconstruct the observed twentieth century climatology of extreme events and solar radiation ... [more ▼]

This research aims to assess the ability of the regional climate model MAR ("Modèle Atmosphérique Régional") to reconstruct the observed twentieth century climatology of extreme events and solar radiation in Belgium, as a necessary condition for reliable future projections. Simulations were performed by forcing MAR with several reanalyses: the ERA40/ERA-Interim, the ERA-20C and the NCEP/NCAR-v1. The results suggests that increasing air temperature would have generated decreasing relative humidity which would have lead to a decrease in cloudiness and an increase in solar downward radiation. This research illustrates the dependency between RCMs and their forcings. The forcing reanalyses can generate divergent trends while contrary to Global Climate Models (GCM), the reanalyses assimilate observations and are supposed to represent the same climate. [less ▲]

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See detailStochastic multi-scale modelling of MEMS
Lucas, Vincent ULg

Doctoral thesis (2016)

When studying Micro-Electro-Mechanical Systems (or MEMS) made of poly-crystalline materials, as the size of the device is only one or two orders of magnitude higher than the size of the grains, the ... [more ▼]

When studying Micro-Electro-Mechanical Systems (or MEMS) made of poly-crystalline materials, as the size of the device is only one or two orders of magnitude higher than the size of the grains, the structural properties exhibit a scatter at the macro-scale due to the existing randomness in the grain size, grain orientation, surface roughness... In order to predict the probabilistic behaviour at the structural scale, we investigated the recourse to a stochastic 3-scale approach in this thesis dissertation. Estimating the scatter in the response of the structure is studied at macro-scale based on stochastic finite elements along with Monte-Carlo simulations. To produce accurate results, the mesh size of the finite element approach should be small enough so that the heterogeneities can be captured. This can lead to overwhelming computation if the microstructure is directly considered, thus justifying the recourse to stochastic homogenisation to define a meso-scale random field. Based on a stochastic model of this random field, the variability of the response of the structure can be computed. In this work, the micro-scale uncertainties are modelled based on measurements provided by the IMT-Bucharest institute. These uncertainties are then propagated towards the macro-scale for 3 different problems. The first one serves the purpose of verification. The variability of the resonance frequency of a micro-beam is computed and compared to a reference numerical solution. The second problem extends the 3-scale approach to the thermo-elastic case. Thus the uncertainties of the quality factor of 3D beams are studied with a modelling of the anchor. Finally, the third problem aims at propagating surface roughness uncertainties on the resonance frequency of thin plates. [less ▲]

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See detailFertility progression in Germany: an analysis using flexible nonparametric cure survival models
Bremhorst, Vincent; Kreyenfeld, Michaela; Lambert, Philippe ULg

in Demographic Research (2016)

OBJECTIVE This paper uses data from the German Socio-Economic Panel (GSOEP) to study the transition to second and third births. In particular, we seek to distinguish the factors that determine the timing ... [more ▼]

OBJECTIVE This paper uses data from the German Socio-Economic Panel (GSOEP) to study the transition to second and third births. In particular, we seek to distinguish the factors that determine the timing of fertility from the factors that influence ultimate parity progression. METHODS We employ cure survival models, a technique commonly used in epidemiological studies and in the statistical literature but only rarely applied to fertility research. RESULTS We find that education has a different impact on the timing and the ultimate probability of having a second and a third birth. Furthermore, we show that the shape of the fertility schedule for the total population differs from that of ‘susceptible women’ (i.e., those who have a second or a third child). CONCLUSION Standard event history models conflate timing and quantum effects. Our approach overcomes this shortcoming. It estimates separate parameters for the hazard rate of having a next child for the ‘susceptible population’ and the ultimate probability of having another child for the entire population at risk. [less ▲]

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See detailNormative data on teachers’ voice use in real-life situations
Schiller, Isabel ULg; Morsomme, Dominique ULg; Alcoulombre, Anaëlle et al

Conference (2016, August 25)

Background As part of their working routine, teachers use their voice for extended periods of time. To compensate for adverse acoustic conditions and background noise, they are also required to speak at ... [more ▼]

Background As part of their working routine, teachers use their voice for extended periods of time. To compensate for adverse acoustic conditions and background noise, they are also required to speak at high intensities. Since teaching is acknowledged to be vocally demanding, several studies have investigated teachers’ vocal load, that is, the stress inflicted on the larynx during vocalization, which is thought to be influenced by duration, intensity and frequency of phonation. A promising method for analyzing teachers’ phonatory behavior in real-life situations is the use of a portable voice dosimeter that objectively documents vocal parameters. Depending on several factors, those parameters may vary within the teaching profession (Masuda et al., 1993; Morrow and Connor, 2011; Remacle, Morsomme, and Finck, 2014). With the aim of quantifying their vocal parameters and identifying the most at-risk teaching conditions, we have established a large database of French-speaking teachers. Based on this database, this study analyzed vocal loading differences with regard to gender, teaching level, and environment (professional versus extra-professional). Methods Seventy-six French-speaking teachers (15 males and 61 females) were monitored during one workweek using the Ambulatory Phonation Monitor voice dosimeter (KayPENTAX). The subjects included 21 kindergarten, 20 primary and 35 secondary school teachers. All male subjects were in the latter group. The vocal parameters analyzed were phonation time, intensity and fundamental frequency (F0). Results The statistical analysis revealed that, irrespective of gender, phonation time, F0 and intensity level were significantly higher in the professional environment than the extra-professional environment (p<.01). Among female subjects, the F0 of kindergarten teachers was significantly higher than that of primary school teachers, which in turn was higher than that of secondary school teachers (p<.01). The phonation time and intensity were also higher in female kindergarten teachers than other female teachers, but this difference did not reach significance. As expected, regarding gender differences, we found that female secondary school teachers spoke with significantly higher F0 than their male colleagues (p<.001). In the extra-professional setting, they also spoke with a significantly higher intensity (p<.05), but no such effect was found in the professional environment. Conclusion Overall, our subjects showed an increase in vocal loading parameters when they were at work compared to their free time. This confirms the results of earlier studies and demonstrates that teaching is an occupation with remarkably high vocal demands. The analysis of mean frequency showed that lower school levels were associated with higher-pitched voice. It can be assumed that kindergarten teachers adapt to the higher F0 of their young pupils and that their effort to maintain the pupils’ attention results in greater frequency variations. References Masuda, T., Ikeda, Y., Manako, H., & Komiyama, S. (1993). Analysis of vocal abuse: Fluctuations in phonation time and intensity in 4 groups of speakers. Acta Oto-Laryngologica, 113(3), 547–552. Morrow, S. L., & Connor, N. P. (2011). Comparison of voice-use profiles between elementary classroom and music teachers. Journal of Voice, 25(3), 367–372. Remacle, A., Morsomme, D., & Finck, C. (2014). Comparison of vocal loading parameters in kindergarten and elementary school teachers. Journal of Speech, Language, and Hearing Research, 57(2), 406–415. [less ▲]

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See detailDetermining new threshold temperatures for cooling and heating degree day index of different climatic zones of Iran
Roshan, Gh.R.; Ghanghermeh, A.A.; Attia, Shady ULg

in Renewable Energy : An International Journal (2016), 101(2017), 156-167

Iran is a country with a variety of different climates. Determining the threshold temperatures suitable for providing thermal and climatic comfort is necessary and vital to its population well-being. This ... [more ▼]

Iran is a country with a variety of different climates. Determining the threshold temperatures suitable for providing thermal and climatic comfort is necessary and vital to its population well-being. This research presents new threshold temperatures in order to calculate the degree day index required for heating and cooling by taking advantage of the 12 stations that are representative of the diversity of Iran's climate. Using Olgyay diagram, different bioclimatic ranges of 12 weather stations and their frequencies were compiled, processes and analysed. Mean daily data of temperature and relative humidity were used for the period of 1950e2010. Based on the frequencies of temperature readings falling in Olgyay's diagram comfort zone, representive temperature thresholds were selected based on 40 to 60 percentiles or (P20), 25e75% percentile (P50) and the threshold of 10e90% percentile. The findings of this study shows that Mashhad with 29.6% and Anzali with 2.33% of frequencies, have experienced the maximum and minimum days of comfort. After analyzing various percentiles to determine the threshold temperatures, it was observed that there is a little difference among the stations for determining the minimum threshold for the comfort. Differences are more obvious in the maximum thresholds. In total, minimum base temperatures (HDD) belonged to Ardabil stations that were 20.50, 20.90 and 20 deg C for P20, P50 and P80 respectively. The maximum temperature for calculating CDD with values of (P20 ¼ 25 C; P50 ¼ 26.25 C; P80 ¼ 27.50 C) is dedicated to Zabol station. The findings present more reasonable thermal comfort thresholds that can be used by architects, engineers and policy makers to achieve, in turn, more energy efficient homes and high quality indoor and outdoor living environments. [less ▲]

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See detailDobble, analyse d'un jeu de cartes
Rigo, Michel ULg

Conference given outside the academic context (2016)

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