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See detailMeteorological variation in daily travel behaviour: evidence from revealed preference data from the Netherlands
Creemers, Lieve; Wets, Geert; Cools, Mario ULg

in Theoretical & Applied Climatology (in press)

This study investigates the meteorological variation in revealed preference travel data. The main objective of this study is to investigate the impact of weather conditions on daily activity participation ... [more ▼]

This study investigates the meteorological variation in revealed preference travel data. The main objective of this study is to investigate the impact of weather conditions on daily activity participation (trip motives) and daily modal choices in the Netherlands. To this end, data from the Dutch National Travel Household Survey of 2008 were matched to hourly weather data provided by the Royal Dutch Meteorological Institute and were complemented with thermal indices to indicate the level of thermal comfort and additional variables to indicate the seasonality of the weather conditions. Two multinomial logit–generalised estimation equations (MNL-GEE) models were constructed, one to assess the impact of weather conditions on trip motives and one to assess the effect of weather conditions on modal choice. The modelling results indicate that, depending on the travel attribute of concern, other factors might play a role. Nonetheless, the thermal component, as well as the aesthetical component and the physical component of weather play a significant role. Moreover, the parameter estimates indicate significant differences in the impact of weather conditions when different time scales are considered (e.g. daily versus hourly based). The fact that snow does not play any role at all was unexpected. This finding can be explained by the relatively low occurrence of this weather type in the study area. It is important to consider the effects of weather in travel demand modelling frameworks because this will help to achieve higher accuracy and more realistic traffic forecasts. These will in turn allow policy makers to make better long-term and short-term decisions to achieve various political goals, such as progress towards a sustainable transportation system. Further research in this respect should emphasise the role of weather conditions and activityscheduling attributes. [less ▲]

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See detailThe Bounds of Object. The Brentano-Meinong Dispute, A Priori Knowledge, and the Power of Perception
Boccaccini, Federico ULg

in Leclercq, Bruno; Richard, Sébastien; Seron, Denis (Eds.) Objects and Pseudo-Objects. Ontological deserts and jungles from Meinong to Carnap (in press)

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See detailSoutenir le développement des compétences des enseignants du supérieur par la documentation, l’investigation et le partage des pratiques en classe
Poumay, Marianne ULg; Georges, François ULg

in Dossiers des Sciences de l'Education (Les) (in press)

L’article aborde le développement professionnel des enseignants à travers un master complémentaire en pédagogie de l’enseignement supérieur. Orientée recherche, cette formation met en œuvre les principes ... [more ▼]

L’article aborde le développement professionnel des enseignants à travers un master complémentaire en pédagogie de l’enseignement supérieur. Orientée recherche, cette formation met en œuvre les principes du courant « SoTL ». Elle préconise une documentation de ses pratiques, une investigation de type scientifique de l’apprentissage des étudiants dans sa propre classe et une production de connaissance par le partage de ses avancées. Les articles de régulation rédigés à l’issue de la formation par une cohorte de dix participants montrent leur réelle inscription dans ce courant « SoTL » ; une enquête donne par ailleurs des indices d’efficacité de la formation sur ces mêmes critères à moyen terme. [less ▲]

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See detailConditioning materials with biomacromolecules: composition of the adlayer and influence on cleanability
Toure, Yetioman ULg; Genet, J. Michel; Dupont-Gillain, C. Christine et al

in Journal of Colloid and Interface Science (in press)

The influence of substrate hydrophobicity and biomacromolecules (dextran, bovine serum albumin - BSA) adsorption on the cleanability of surfaces soiled by spraying aqueous suspensions of quartz particles ... [more ▼]

The influence of substrate hydrophobicity and biomacromolecules (dextran, bovine serum albumin - BSA) adsorption on the cleanability of surfaces soiled by spraying aqueous suspensions of quartz particles (10 to 30 µm size), then dried, was investigated using glass and polystyrene as substrates. The cleanability was evaluated using radial flow cell (RFC). The surface composition was determined by X-ray photoelectron spectroscopy (XPS). The interpretation of XPS data allowed the complexity due to the ubiquitous presence of organic contaminants to be coped with, and the surface composition to be expressed in terms of both the amount of adlayer and the mass concentration of adlayer constituents. When soiled with a suspension of particles in water, glass was much less cleanable than polystyrene, which was attributed to its much lower water contact angle, in agreement with previous observations on starch soil. Dextran was easily desorbed and did not affect the cleanability. The presence of BSA at the interface strongly improved the cleanability of glass while the contact angle did not change appreciably. In contrast, soiling polystyrene with quartz particles suspended in a BSA solution instead of water did not change markedly the cleanability, while the contact angle was much lower and the aggregates of soiling particles were more flat. These observations are explained by the major role of capillary forces developed upon drying, which influence the closeness of the contact between the soiling particles and the substrate and, thereby, the adherence of particles. The capillary forces are proportional to the liquid surface tension and depend in a more complex way on contact angles of the particles and of the substrate. The dependence of cleanability on capillary forces, and in particular on the liquid surface tension, is predominant as compared with its dependence on the size and shape of the soiling aggregates, which influence the efficiency of shear forces exerted by the flowing water upon cleaning. [less ▲]

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See detailDose-dependent effect of experimental Schmallenberg virus infection in sheep
Poskin, A; Martinelle, Ludovic ULg; Mostin, L et al

in Veterinary Journal (in press)

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See detailOrganic Rankine Cycles including fluid selection
Lemort, Vincent ULg; Declaye, Sébastien ULg; Quoilin, Sylvain ULg

in Handbook of Clean Energy Systems (in press)

An Organic Rankine Cycle (ORC) is similar to a steam Rankine cycle, except that the working fluid is not water but an organic compound, such as a refrigerant or a hydrocarbon, characterized by a lower ... [more ▼]

An Organic Rankine Cycle (ORC) is similar to a steam Rankine cycle, except that the working fluid is not water but an organic compound, such as a refrigerant or a hydrocarbon, characterized by a lower ebullition temperature than that of water. Hence lower temperature heat sources can be exploited such as solar energy, geothermal energy and waste heat recovery from many different processes. During the design phase of an ORC system, the selection of the working fluid must be conducted in parallel with the selection and the sizing of the components (mainly the expansion machine, the pump and the heat exchangers) and with the definition of the cycle architecture. This approach allows taking into consideration all technical constraints. Relevant properties of working fluids that should be considered during their selection are listed. Major characteristics of available displacement and turbo-expander technologies are described. The impact of the pump performance on the overall performance is discussed and strategies to increase the available NPSH are proposed. Finally, improved cycle architectures are introduced. Major applications of ORC systems are described: geothermal power plants, biomass CHP plants, waste heat recovery in industry, waste heat recovery on internal combustion engines and solar power plants. All these applications differ by the nature of the heat source and heat sink, the integration of the ORC with these sources and sinks, and the range of installed capacities. These differences yield specific designs, which are described. Performance achieved by systems in operation or prototypes are presented. [less ▲]

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See detailDétection automatique de réminiscences potentielles de Xénophon chez Arrien
Vanhaegendoren, Koen ULg; Vandersmissen, Marc ULg

in Etudes Classiques (Namur, Belgium) (in press)

Depuis des siècles, les spécialistes et les savants des littératures grecque et latine se sont attachés à repérer les citations et les reprises d’un auteur chez un autre en raison de l’importance de ... [more ▼]

Depuis des siècles, les spécialistes et les savants des littératures grecque et latine se sont attachés à repérer les citations et les reprises d’un auteur chez un autre en raison de l’importance de l’imitatio et de l’aemulatio dans le processus de création littéraire des œuvres anciennes. Arrien de Nicomédie en est un parfait exemple puisqu’il s’inspira abondamment de son modèle admiré, Xénophon. C’est pourquoi, après avoir répertorié le plus grand nombre possible de réutilisations déjà mises au jour entre les deux historiens par les philologues de manière livresque, notre projet a pour but de détecter et de commenter de nouvelles réminiscences potentielles de Xénophon dans l’œuvre d’Arrien grâce à un logiciel développé spécifiquement à l’Université de Liège sur base de fichiers de textes lemmatisés en collaboration avec le LASLA. [less ▲]

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See detailL’auteur de la Passio sanctae Salsae a-t-il aussi écrit la Passio sancti Fabii ?
Fialon, Sabine ULg

in Meyers, Jean; Fialon, Sabine (Eds.) La Passio sanctae Salsae. Recherches sur une passion tardive d’Afrique du Nord. Avec une nouvelle édition critique d’A. M. Piredda et une traduction annotée du G.R.A.A. (in press)

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See detailJews and Christians in Late Africa : an hagiographical perspective
Fialon, Sabine ULg

in Lanfranchi, Pierluigi; Verheyden, Joseph (Eds.) Jews and Christians in Late Antiquity (titre provisoire) (in press)

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See detail« Semen est sanguis christianorum » (Apol. 50, 13). Tertullien et l'hagiographie africaine
Fialon, Sabine ULg

in Lagouanère, Jérôme; Fialon, Sabine (Eds.) Tertullianus Afer. Tertullien et la littérature chrétienne d'Afrique, IIe-VIe siècle (in press)

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See detailPET imaging analysis using a parcelation approach and multiple kernel classification
Segovia-Román, Fermín ULg; Phillips, Christophe ULg

in International Workshop on Pattern Recognition in Neuroimaging, Tübingen 4-6 June 2014 (in press)

Positron Emission Tomography (PET) is a non-invasive medical imaging modality that provides information about physiological processes. Due to its ability to measure the brain metabolism, it is widely used ... [more ▼]

Positron Emission Tomography (PET) is a non-invasive medical imaging modality that provides information about physiological processes. Due to its ability to measure the brain metabolism, it is widely used to assist the diagnosis of neurodegenerative disorders such as Alzheimer’s disease (AD) of Parkinsonism. In order to avoid the subjectivity inherent to the visual exploration of the images, several computer systems to analyze PET data were developed during the last years. However, dealing with the huge amount of information provided by PET imaging is still a challenge. In this work we present a novel methodology to analyze PET data that improves the automatic differentiation between controls and AD patients. First the images are divided into small regions or parcels, defined either anatomically, geometrically or randomly. Secondly, the accuray of each single region is estimated using a Support Vector Machine (SVM) classifier and a cross-validation approach. Finally, all the regions are assessed together using multiple kernel SVM with a kernel per region. The classifier is built so that the most discriminative regions have more weight in the final decision. This method was evaluated using a PET dataset that contained images from healthy controls and AD patients. The classification results obtained with the proposed approach outperformed two recently reported computer systems based on Principal Component Analysis and Independent Component Analysis. [less ▲]

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See detailSophistique et Philosophie: Platon, héritier de Protagoras
Gavray, Marc-Antoine ULg

Book published by Vrin (in press)

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See detailGenetic parameters for mid-infrared methane indicators based on milk fatty acids in dairy cows
Kandel, Purna Bhadra ULg; Gengler, Nicolas ULg; Soyeurt, Hélène ULg

in Journal of Applied Animal Research (in press)

Dairy production is identified as a major source of methane (CH4) emissions. Selective breeding canbe one method used to mitigate CH4 emissions but practical and cheap measurement of this trait is not ... [more ▼]

Dairy production is identified as a major source of methane (CH4) emissions. Selective breeding canbe one method used to mitigate CH4 emissions but practical and cheap measurement of this trait is not currently available. The mid-infrared (MIR) prediction of milk fatty acids is relevant in this context. Five MIR methane indicators were derived from the literature and were calibrated from 600 samples analyzed by gas chromatography. Genetic parameters for these traits were estimated using single trait random regression test-day models from 619,265 records collected from 2007 to 2011 on 71,188 Holstein cows in their first three lactations. For the published indicator showing the highest relationship with the methane data (R2 = 0.88), the average daily heritability was 0.34±0.01, 0.37±0.01 and 0.34±0.01 for the first three lactations, respectively. The methane emission (g/day) was increased from beginning of lactation, reached at the highest in peak of lactation and decreased towards end of lactation. The largest differences between estimated breeding values (EBV) of sires having daughters in production eructing the highest and the lowest methane content was 21.80, 22.75 and 24.89 kg per lactation for the first three parities. Positive genetic correlations were estimated between indicator traits and milk fat and protein content. Low negative correlation was observed with milk yield. In conclusion, this study shows the feasibility to predict methane indicator traits by MIR. Moreover, the estimated genetic parameters suggest also a potential genetic variability of the quantity of methane eructed by dairy cows. [less ▲]

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See detailAntiquité tardive et christianisme africains dans l'Africa romana : un bilan historiographique
Fialon, Sabine ULg

in Ruggeri, Paola (Ed.) L’Africa romana XX. Momenti di continuita e rottura : bilancio di 30 anni di convegni de l’Africa romana (in press)

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See detailPlaton: le Politique, introduction, traduction et commentaire
Dixsaut, Monique; El Murr, Dimitri; Gavray, Marc-Antoine ULg et al

Book published by Vrin (in press)

Nouvelle traduction commentée et annotée du Politique de Platon

Detailed reference viewed: 23 (1 ULg)
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See detailLe monde du représentable: de Lotze à la phénoménologie
Dewalque, Arnaud ULg

in Boccaccini, Federico (Ed.) Lotze et son héritage. Son influence et son impact sur la philosophie du XXe siècle (in press)

Dans ce chapitre, je me propose de réévaluer, au moins partiellement, le sens et la portée de la théorie de la « validité » (Gelten, Geltung) développée par Lotze dans sa grande Logique de 1874. Je ... [more ▼]

Dans ce chapitre, je me propose de réévaluer, au moins partiellement, le sens et la portée de la théorie de la « validité » (Gelten, Geltung) développée par Lotze dans sa grande Logique de 1874. Je suggérerai que le rapprochement traditionnellement invoqué entre Lotze et Bolzano est trompeur, puisqu’il a sans doute assez largement contribué à masquer la dimension eidétique et « matérielle » de la théorie lotzéenne de la validité (§1). L’une des idées centrales qui se cache derrière la notion de « validité », en effet, est que les contenus de représentation – et, exemplairement, les contenus de représentations sensorielles (les concepts de couleurs, de sons, etc.) – forment une sphère intrinsèquement structurée par des relations d’un certain genre. Contrairement aux relations logiques traditionnelles (comme la contradiction) et aux relations logico-syntaxiques, qui structurent aussi le « monde du représensable » d’un autre point de vue (§2), les relations dont il est question ici sont non formalisables, car elles sont fondées dans l’essence même des phénomènes, pris « en soi », c’est-à-dire indépendamment de leur instanciation dans un objet du monde spatio-temporel et de leur appréhension par un sujet psycho-physique (§3). [less ▲]

Detailed reference viewed: 28 (1 ULg)