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See detailLe Tournant psychologique
Dewalque, Arnaud ULg; Gyemant, Maria ULg

in Gyemant, Maria (Ed.) Psychologie et psychologisme (2014)

Par "tournant psychologique", nous entendons l’adhésion significative de plusieurs auteurs à la conviction selon laquelle les problèmes philosophiques ne peuvent pas être traités de manière satisfaisante ... [more ▼]

Par "tournant psychologique", nous entendons l’adhésion significative de plusieurs auteurs à la conviction selon laquelle les problèmes philosophiques ne peuvent pas être traités de manière satisfaisante sans les ressources de l’analyse psychologique. Nous montrons ici que ce tournant s’est effectué progressivement au XIXe siècle dans la philosophie de langue allemande, et qu'il a donné lieu à des approches incarnées par des philosophes aussi différents que Fries, Beneke, Brentano, Stumpf, Dilthey, Lipps, Wundt ou le jeune Husserl. Quelque divergentes que soient leurs positions, ces auteurs partagent généralement l’idée que philosophie et psychologie sont inséparables. Aussi pourrait-on dire que le tournant psychologique n’est rien d’autre que l’adoption d'une "thèse d’inséparabilité". De cette thèse, nous distinguons ici la thèse "psychologiste" au sens étroit ou strict, selon laquelle la vérité d'une proposition (mais aussi la beauté d'une forme, la bonté d'une action, etc.) dépend des mécanismes mentaux d'un individu ou de l'esprit humain. Notre objectif est de suggérer que le tournant psychologique n'implique pas nécessairement l'adhésion à la thèse psychologiste. [less ▲]

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See detailHedgehog- and mTOR-targeted therapies for advanced basal cell carcinomas.
FRANCHIMONT, Claudine ULg; Hermanns-Lê, Trinh ULg; PAQUET, Philippe ULg et al

in Current approaches to basal cell carcinoma (2014)

Basal cell carcinomas (BCCs) are the most frequent human cancer. Over 90% of all BCCs have a mutation in patched homologue 1 (PTCH 1) or smoothened (SMO), two conducting proteins of the Hedgehog (Hh ... [more ▼]

Basal cell carcinomas (BCCs) are the most frequent human cancer. Over 90% of all BCCs have a mutation in patched homologue 1 (PTCH 1) or smoothened (SMO), two conducting proteins of the Hedgehog (Hh) pathway. They rarely progress deeply and metastasize; however, if they do, these advanced BCC become amenable to treatment by inhibiting the Hedgehog and the P13K–mTOR pathways. Such innovative drugs include vismodegib, cyclopamine, itraconazole, everolimus and a few other agents that are in early clinical development. [less ▲]

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See detailLes industries à pointes foliacées lors du passage du Paléolithique moyen au supérieur dans les régions septentrionales de l’Europe
Flas, Damien ULg

in Otte, Marcel (Ed.) Néandertal / Cro Magnon. La rencontre (2014)

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See detailUltrathin porous pavement made with high viscosity asphalt rubber binder: A better acoustic absorption?
Luong, Jeanne ULg; Bueno, M.; Vazquez, V.F. et al

in Applied Acoustics (2014), 79

his work presents a non-destructive technique applied to ultrathin porous asphalt pavements that allows us to characterize their internal structure. Comparison between acoustic absorption data from ... [more ▼]

his work presents a non-destructive technique applied to ultrathin porous asphalt pavements that allows us to characterize their internal structure. Comparison between acoustic absorption data from experimental tests with an impedance tube and analytical simulation leads to an optimization of intrinsic parameters, such as tortuosity, airflow resistivity and porosity. The studied ultrathin specimens are of a high air void content porous mixture made with conventional polymer modified bituminous binder and high viscosity rubber binder. It has been found that one of the studied mixtures presents less air void con- tent than specified by the manufacturer, and thus absorbs less noise as foreseen. Finally, in this case it appears that using a high viscosity asphalt rubber binder has no influence on maximum acoustic absorp- tion but on the frequency of appearance of this maximum, tortuosity and airflow resistivity. [less ▲]

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See detailHighly dispersed Pt/C catalysts prepared by the Charge Enhanced DryImpregnation method
Cao Chongjiang; Yang Guang; Dubau Laetitia et al

in Applied Catalysis B : Environmental (2014), 150-151

tAn efficient method to synthesize highly dispersed Pt/carbon xerogel catalysts for Proton ExchangeMembrane fuel cell applications is described. The synthesis proceeds via the Charge Enhanced ... [more ▼]

tAn efficient method to synthesize highly dispersed Pt/carbon xerogel catalysts for Proton ExchangeMembrane fuel cell applications is described. The synthesis proceeds via the Charge Enhanced DryImpregnation method (CEDI), which combines dry impregnation with the Strong Electrostatic Adsorp-tion technique (SEA). The samples prepared via CEDI or SEA techniques were dried and reduced underhydrogen to obtain supported Pt nanoparticles. In order to increase the Pt mass fraction up to 10 wt.%,two successive impregnation-drying-reduction cycles were performed. The synthesized Pt nanoparticlesare homogeneously distributed on the carbon support and highly dispersed (mean Pt nanoparticle sizeof ca. 2 nm). The CEDI method is ideally suited to avoid Pt losses during the catalyst preparation. [less ▲]

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See detailThermoCycle: A Modelica library for the simulation of thermodynamic systems
Quoilin, Sylvain ULg; Desideri, Adriano ULg; Wronski, Jorrit et al

in Proceedings of the 10th International Modelica Conference 2014 (2014)

This paper presents the results of an on-going project to develop ThermoCycle, an open Modelica library for the simulation of low-capacity thermodynamic cycles and thermal systems. Special attention is ... [more ▼]

This paper presents the results of an on-going project to develop ThermoCycle, an open Modelica library for the simulation of low-capacity thermodynamic cycles and thermal systems. Special attention is paid to robustness and simulation speed since dynamic simulations are often limited by numerical constraints and failures, either during initialization or during integration. Furthermore, the use of complex equations of state (EOS) to compute thermodynamic properties significantly decreases the simulation speed. In this paper, the approach adopted in the library to overcome these challenges is presented and discussed. [less ▲]

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See detailInfluence des représentations sociales de l’environnement sur l’adoption des pratiques durables de production. Une contribution à partir du système de production de coton biologique au Bénin
Assogba, Sonagnon Claude-Gervais ULg; Tossou, Cocou Rigobert; Lebailly, Philippe ULg

in Journal of Oriental and African Studies (2014), 23

Le présent article est une contribution à l’analyse des facteurs qui déterminent le comportement des producteurs dans l’odoption des pratiques durables de production de coton au Bénin. Il s’appuie sur une ... [more ▼]

Le présent article est une contribution à l’analyse des facteurs qui déterminent le comportement des producteurs dans l’odoption des pratiques durables de production de coton au Bénin. Il s’appuie sur une recherche menée auprès des biocotonculteurs de la commune de Kandi dans le bassin cotonnier du Nord-Bénin. L’objectif visé est de caractériser les représentations sociales des producteurs de l’environnement et de mieux cerner en quoi elles déterminent leur comportement dans l’appropriation du système de production de coton biologique. Les données ont été collectées auprès d’un échantillon de 188 producteurs sélectionnés à partir d’une typologie à dires d’acteurs, basée sur les critères endogènes de prospérité. L’approche structurale des représentations sociales et le test d’indépendance de chi 2 ont été utilisés à cet effet. Il ressort des résultats et analyses que les producteurs de coton biologique ont une vision anthropocentrique et utilitariste de l’environnement qu’ils perçoivent comme un réservoir pourvoyeur des ressources nécessaires pour leur survie. L’adhésion des producteurs au programme de production de coton biologique est sous-tendue par des motivations d’abord économiques (40%) puis environnementales (18%) et sociales (11%). Il est apparu que le type de comportement adopté par le producteur dans la mise en œuvre des pratiques de production biologique est davantage lié aux facteurs qui motivent son adhésion. Aussi, avons-nous montré que les producteurs qui respectent mieux les exigences du système de production biologique sont ceux dont l’adhésion est principalement mue par des considérations environnementales. [less ▲]

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See detailSECOND ORDER SYMMETRIES OF THE CONFORMAL LAPLACIAN
Michel, Jean-Philippe ULg; Radoux, Fabian ULg; Silhan, Josef

in Symmetry, Integrability and Geometry: Methods and Applications [=SIGMA] (2014), 10(016), 26

Let (M,g) be an arbitrary pseudo-Riemannian manifold of dimension at least 3. We determine the form of all the conformal symmetries of the conformal (or Yamabe) Laplacian on (M,g), which are given by ... [more ▼]

Let (M,g) be an arbitrary pseudo-Riemannian manifold of dimension at least 3. We determine the form of all the conformal symmetries of the conformal (or Yamabe) Laplacian on (M,g), which are given by differential operators of second order. They are constructed from conformal Killing 2-tensors satisfying a natural and conformally invariant condition. As a consequence, we get also the classification of the second order symmetries of the conformal Laplacian. Our results generalize the ones of Eastwood and Carter, which hold on conformally flat and Einstein manifolds respectively. We illustrate our results on two families of examples in dimension three. [less ▲]

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See detailValidation of a SPH model for free surface flows
Goffin, Louis ULg; Erpicum, Sébastien ULg; Dewals, Benjamin ULg et al

Conference (2014)

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See detailPenser l'incertain
Vrancken, Didier ULg

in Vrancken, Didier (Ed.) Penser l'incertain (2014)

Introduction générale à l'ouvrage construite autour de 8 sections : 1) Ne plus trembler face aux risques; 2) Catastrophes, risques, incertitudes : les mots pour tenter de les dire; 3) L'incertain en ... [more ▼]

Introduction générale à l'ouvrage construite autour de 8 sections : 1) Ne plus trembler face aux risques; 2) Catastrophes, risques, incertitudes : les mots pour tenter de les dire; 3) L'incertain en sociologie; 4) L'incertain en débat; 5) Des mondes incertains; 6) Des vies éprouvantes; 7) La sociologie à l'épreuve de l'incertain; 8) Ouvertures. [less ▲]

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See detailBioactive Intraocular Lens – A Strategy to Control Secondary Cataract
Huang, Yi-Shiang ULg; Bertrand, Virginie ULg; Bozukova, Dimitriya et al

in IFMBE Proceedings (2014), 41

Cataract is the opacity of the lens, causing impairment of vision or even blindness. Today, a surgery is still the only available treatment. The intraocular lens (IOL) is a polymer implant designed to ... [more ▼]

Cataract is the opacity of the lens, causing impairment of vision or even blindness. Today, a surgery is still the only available treatment. The intraocular lens (IOL) is a polymer implant designed to replace the natural lens in the cataract surgery. However, the bioinert materials could not satisfy the unmet need in the secondary cataract control. Posterior capsular opacification (PCO, or Secondary Cataract), characterized by a thick and cloudy layer of lens epithelial cells (LECs), is the most common postoperative complication. In our research, a bioactive molecule is immobilized onto the conventional acrylic hydrophilic polymer pHEMA (Poly(2-hydroxyethyl methacrylate)) using oxygen plasma treatment followed by deposition. The RGD peptide sequence, being well-known for its ability to promote cellular attachment by binding to integrin receptors, is designed to stimulate the adhesion of LECs on the IOL. Our data show the peptide immobilized biomaterial not only exhibits similar optical property, but also reveals enhanced biological properties in cell adhesion and cell morphology maintenance. By means of surface functionalization of IOL to stimulate LECs adhesion, the secondary cataract could be controlled. [less ▲]

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See detailA Givetian tintinnid-like palynomorph from Libya.
Steemans, Philippe ULg; Breuer, P.; Ville de Goyet, F. de et al

in Review of Palaeobotany and Palynology (2014), ?

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See detailDu texte littéraire au document : les connexions entre les papyrus littéraires et documentaires grecs et latins
Marganne, Marie-Hélène ULg

in Derda, Tomasz; Urbanik, Jakub (Eds.) Actes du XXVIIe Congrès International de papyrologie (Varsovie, 29.07-03.08.2013) (2014)

Si l'on distingue généralement les papyrus littéraires et les papyrus documentaires grecs et latins, ces deux catégories présentent cependant, à côté du support, de l'écriture et des scribes, d'autres ... [more ▼]

Si l'on distingue généralement les papyrus littéraires et les papyrus documentaires grecs et latins, ces deux catégories présentent cependant, à côté du support, de l'écriture et des scribes, d'autres caractéristiques communes : certains papyrus paralittéraires présentent des traits documentaires ; d'autres papyrus sont trop fragmentaires pour être sûrement identifiés, soit comme littéraires, soit comme documentaires ; certains écrits comme les lettres et les discours peuvent, soit être liés à une profession ou à une circonstance particulière (documents), soit être fictifs (littéraires) ; des papyrus documentaires contiennent des citations ou des réminiscences littéraires ; des papyrus littéraires présentent un document sur l'autre face ; des papyrus littéraires font partie d'archives documentaires . Appliquant aux textes documentaires ou indéterminés la même grille d'analyse qu'aux textes littéraires, la nouvelle base de données du CEDOPAL permet de rendre compte de ces connexions et de les exploiter en vue de mieux évaluer les écrits concernés, les méthodes scribales mises en œuvre, ainsi que leur contexte de production et d'utilisation. [less ▲]

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See detailInterstitial insulin kinetic parameters for a 2-compartment insulin model with saturable clearance
Pretty, Christopher G.; Le Compte, Aaron; Penning, Sophie ULg et al

in Computer Methods and Programs in Biomedicine (2014)

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See detailChromera velia, Endosymbioses and the Rhodoplex Hypothesis - Plastid Evolution in Cryptophytes, Alveolates, Stramenopiles and Haptophytes (CASH Lineages)
Petersen, Jörn; Ludewig, Ann-Kathrin; Michael, Victoria et al

in Genome Biology and Evolution (2014)

The discovery of Chromera velia, a free-living photosynthetic relative of apicomplexan pathogens, has provided an unexpected opportunity to study the algal ancestry of malaria parasites. In this work we ... [more ▼]

The discovery of Chromera velia, a free-living photosynthetic relative of apicomplexan pathogens, has provided an unexpected opportunity to study the algal ancestry of malaria parasites. In this work we compared the molecular footprints of a eukaryote-to-eukaryote endosymbiosis in C. velia to their equivalents in peridinin-containing dinoflagellates (PCD) to re- evaluate recent claims in favor of a common ancestry of their plastids. To this end, we established the draft genome and a set of full-length cDNA sequences from C. velia via next- generation sequencing. We documented the presence of a single coxI gene in the mitochondrial genome, which thus represents the genetically most reduced aerobic organelle identified so far, but focused our analyses on five “lucky genes” of the Calvin cycle. These were selected because of their known support for a common origin of complex plastids from cryptophytes, alveolates (represented by PCDs), stramenopiles and haptophytes (CASH) via a single secondary endosymbiosis with a red alga. As expected, our broadly sampled phylogenies of the nuclear- encoded Calvin cycle markers support a rhodophycean origin for the complex plastid of Chromera. However, they also suggest an independent origin of apicomplexan and dinophycean (PCD) plastids via two eukaryote-to-eukaryote endosymbioses. Although at odds with the current view of a common photosynthetic ancestry for alveolates, this conclusion is nonetheless in line with the deviant plastome architecture in dinoflagellates and the morphological paradox of four versus three plastid membranes in the respective lineages. Further support for independent endosymbioses is provided by analysis of five additional markers, four of them involved in the plastid protein import machinery. Finally, we introduce the “rhodoplex hypothesis” as a convenient way to designate evolutionary scenarios where CASH plastids are ultimately the product of a single secondary endosymbiosis with a red alga, but were subsequently horizontally spread via higher-order eukaryote-to-eukaryote endosymbioses. [less ▲]

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See detailAmantadine, Apomorphine and Zolpidem in the Treatment of Disorders of Consciousness
Gosseries, Olivia ULg; Charland-Verville, Vanessa ULg; Thonnard, Marie ULg et al

in Current Pharmaceutical Design (2014), 20

Survivors of severe brain injuries may end up in a state of 'wakeful unresponsiveness' or in a minimally conscious state. Pharmacological treatments of patients with disorders of consciousness aim to ... [more ▼]

Survivors of severe brain injuries may end up in a state of 'wakeful unresponsiveness' or in a minimally conscious state. Pharmacological treatments of patients with disorders of consciousness aim to improve arousal levels and recovery of consciousness. We here provide a systematic overview of the therapeutic effects of amantadine, apomorphine and zolpidem in patients recovering from coma. Evidence from clinical trials using these commonly prescribed pharmacological agents suggests positive changes in the neurological status in patients, leading sometimes to dramatic improvements. These findings are discussed in the context of current hypotheses of these agents' therapeutic mechanisms on cerebral function. In order to enhance our understanding of the underlying pathophysiological mechanisms of these drugs, we suggest combining sensitive and specific behavioral tools with neuroimaging and electrophysiological measures in large randomized, double-blind, placebo-controlled experimental designs. We conclude that the pharmacokinetics and pharmacodynamics of amantadine, apomorphine and zolpidem need further exploration to determine which treatment would provide a better neurological outcome regarding the patient's etiology, diagnosis, time since injury and overall condition. [less ▲]

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See detailSeasonal and depth-related biodiversity of leaf epiphytic Cheilostome Bryozoa in a Mediterranean Posidonia oceanica meadow
Lepoint, Gilles ULg; Balancier, Boris; Gobert, Sylvie ULg

in Cahiers de Biologie Marine (2014), 55(1),

: Epiphytes living fixed on Posidonia oceanica L. (Delile) are important faunal and floral components of seagrass meadow ecosystems. They are involved as main actors in trophic web and major ecosystem ... [more ▼]

: Epiphytes living fixed on Posidonia oceanica L. (Delile) are important faunal and floral components of seagrass meadow ecosystems. They are involved as main actors in trophic web and major ecosystem processes of this endangered coastal habitat. This paper aims to assess the seasonality and the bathymetric variability of epiphytic Bryozoa which are the most important animal group in terms of both diversity and abundance living on P. oceanica leaves. Posidonia shoots were collected from the Revellata Bay (Corsica, France) in four seasons from 7 to 30 m depth. Colony densities reached more than 87000 colonies. m-2 at 10 m depth in spring. The bryozoan species distribution and abundance changed substantially according to seasons and depths, being maximum in spring and minimal in winter. Dominant colony morphotypes change according to depth, probably in relation with water motion gradient. This confirms that there are bathymetric and seasonal variability for different epiphytic organisms colonizing the Posidonia leaves. This enlightens the importance to protect Posidonia meadow on its full depth extension and in its connectivity with other habitats to conserve optimal epiphytic biodiversity and functions. [less ▲]

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See detailOptical study of a solar concentrator for space applications based on a diffractive/refractive optical combination
Michel, Céline ULg; Loicq, Jerôme ULg; Languy, Fabian ULg et al

in Solar Energy Materials & Solar Cells (2014), 120PA

This paper presents a new design of a planar solar concentrator for space applications. The concentrator focuses light onto two spatially separated photovoltaic cells, allowing for independent control of ... [more ▼]

This paper presents a new design of a planar solar concentrator for space applications. The concentrator focuses light onto two spatially separated photovoltaic cells, allowing for independent control of the output power of each cell. Thanks to a blazed diffraction grating superimposed on a Fresnel lens, advantages of both spectral splitting and light focusing can be combined. The theoretical model of the optical design is presented, with the optimization of either element. Moreover, configuration improvement is proposed: a symmetrical configuration composed of two lenses. First numerical results are presented, highlighting the possibility to design a concentrator at about 10× for each cell, with an optical efficiency of about 75% and less than 10% of losses for tracking errors lower than ±0.9°. [less ▲]

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See detailULTRASONIC WAVES THROUGH AGRICULTURAL SOILS TO DETERMINE THEIR COMPACTION AND POROSITY LEVEL 
Luong, Jeanne ULg; Mercatoris, Benoît ULg; Destain, Marie-France ULg

Poster (2014)

Compaction is one of the major causes of the physical degradation of agricultural soils. The traffic of more and more heavy machines leads to a decrease of the porosity at both the topsoil and subsoil ... [more ▼]

Compaction is one of the major causes of the physical degradation of agricultural soils. The traffic of more and more heavy machines leads to a decrease of the porosity at both the topsoil and subsoil levels. This has negative impacts in agricultural and environmental contexts such as the reduction of soil fertility and water infiltration. This project aims at characterizing in a fast and non-destructive way the state of compaction of an agricultural soil at a local scale using ultrasonic wave propagation. Acoustic signatures of soil samples will be correlated to their compaction level and their porosity distribution. This should allow a better comprehension of the compaction process and help to define critical threshold. As a result, this methodology could assist in taking restrictive measures such as load limitation of agricultural engines and implementing remedial methods. This poster presents the experimental protocol implement for this research. [less ▲]

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See detailLow temperature crystallization of yttrium orthoferrite by organic acid-assisted sol-gel synthesis
Stevens, Frédéric ULg; Cloots, Rudi ULg; Poelman, D. et al

in Materials Letters (2014), 114

Yttrium orthoferrite (YFeO3) is a promising material for visible light photocatalytic applications due to its band gap of 2.2-2.6 eV. However, during the synthesis of YFeO3, unwanted composition can be ... [more ▼]

Yttrium orthoferrite (YFeO3) is a promising material for visible light photocatalytic applications due to its band gap of 2.2-2.6 eV. However, during the synthesis of YFeO3, unwanted composition can be obtained and the crystallization requires temperatures as high as 850 C. Powders of YFeO3 were prepared using a sol-gel method with and without organic acids (citric acid, tartaric acid, malonic acid and oxalic acid) used as organic modifiers. The band gap of these powders was measured by diffuse reflection spectroscopy, and the crystallinity and crystalline phase content were characterized by X-ray diffraction. Organic acids allow a higher purity and facilitate crystallization. This work aims to produce YFeO3 powders at the lowest possible temperature. Citric acid was found to be the best additive: it reduces the crystallization temperature below 450 C. This opens new perspectives such as the deposition of crystalline YFeO3 thin films onto conductive glass for water-splitting applications. © 2013 Elsevier B.V. [less ▲]

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