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See detailMagnetocaloric and transport study of poly- and nanocrystalline composite manganites La0.7Ca0.3MnO3/La0.8Sr0.2MnO3
Pekala, M; Pekala, K; Drozd, V et al

in Journal of Applied Physics (2012), 112

Magnetocaloric and transport properties are reported for novel poly- and nanocrystalline double composite manganites, La0.8Sr0.2MnO3/La0.7Ca0.3MnO3, prepared by the sol-gel method. Magnetic field ... [more ▼]

Magnetocaloric and transport properties are reported for novel poly- and nanocrystalline double composite manganites, La0.8Sr0.2MnO3/La0.7Ca0.3MnO3, prepared by the sol-gel method. Magnetic field dependence of magnetic entropy change is found to be stronger for the nano- than the polycrystalline composite. The remarkable broadening of the temperature interval, where the magnetocaloric effect occurs in poly- and nanocrystalline composites, causes the relative cooling power (RCP(S)) of the nanocrystalline composite to be reduced by only 10% compared to the Sr based polycrystalline phase. The RCP(S) of the polycrystalline composite becomes remarkably enhanced. The low temperature magnetoresistance is enhanced by 5% for the nanostructured composite. © 2012 American Institute of Physics [less ▲]

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See detailOptimal parametrizations for surface remeshing
Marchandise, Emilie; Remacle, Jean-François; Geuzaine, Christophe ULg

in Engineering with Computers (2012)

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See detailLes paradoxes de l'art performance
Hagelstein, Maud ULg

in Culture, le Magazine Culturel de l'Université de Liège (2012)

Même en reprécisant le contexte historique d’émergence de l’art performance, la définition de ce genre relativement nouveau au regard de l’histoire de l’art reste difficile à fournir. Plusieurs raisons ... [more ▼]

Même en reprécisant le contexte historique d’émergence de l’art performance, la définition de ce genre relativement nouveau au regard de l’histoire de l’art reste difficile à fournir. Plusieurs raisons peuvent être évoquées : immaturité du médium, anti-conformisme revendiqué, variété des formes. Sans prétendre à l’exhaustivité, on peut néanmoins dégager plusieurs caractéristiques récurrentes et tenter de poser les premiers jalons d’une théorie critique de la performance. Une telle entreprise ne me semble pas pouvoir négliger les paradoxes qu’entraîne ce genre. Car entre le potentiel émancipateur de l’art performance et la réception effective de ses propositions par le public, il y a parfois un gouffre étonnant – mais fascinant à observer (et finalement révélateur). Le week-end ACTUS1 est venu confirmer les ambiguïtés qu’il s’agira dans ce texte d’analyser. [less ▲]

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See detailNanostructure, Excitations, and Thermoelectric Properties of Bi2Te3-Based Nanomaterials
Aabdin, Z.; Peranio, N.; Eibl, O. et al

in Journal of Electronic Materials (2012), 41(6), 1792-1798

The effect of dimensionality and nanostructure on thermoelectric properties in Bi2Te3-based nanomaterials is summarized. Stoichiometric single-crystalline Bi2Te3 nanowires were prepared by potential ... [more ▼]

The effect of dimensionality and nanostructure on thermoelectric properties in Bi2Te3-based nanomaterials is summarized. Stoichiometric single-crystalline Bi2Te3 nanowires were prepared by potential-pulsed electrochemical deposition in a nanostructured Al2O3 matrix, yielding transport in the basal plane. Polycrystalline, textured Sb2Te3 and Bi2Te3 thin films were grown at room temperature using molecular beam epitaxy and subsequently annealed at 250A degrees C. Sb2Te3 films revealed low charge carrier density of 2.6 x 10(19) cm(-3), large thermopower of 130 V K-1, and large charge carrier mobility of 402 cm(2) V-1 s(-1). Bi-2(Te0.91Se0.09)(3) and (Bi0.26Sb0.74)(2)Te-3 nanostructured bulk samples were prepared from as-cast materials by ball milling and subsequent spark plasma sintering, yielding grain sizes of 50 nm and thermal diffusivities reduced by 60\%. Structure, chemical composition, as well as electronic and phononic excitations were investigated by x-ray and electron diffraction, nuclear resonance scattering, and analytical energy-filtered transmission electron microscopy. calculations yielded point defect energies, excitation spectra, and band structure. Mechanisms limiting the thermoelectric figure of merit for Bi2Te3 nanomaterials are discussed. [less ▲]

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See detailInfluence of the reuse of OSB and marine plywood formworks on concrete surface aesthetics
Courard, Luc ULg; Martin, Marie; Goffinet, Cécile et al

in Materials and Structures (2012), 45(9), 1331-1343

Concrete surface quality becomes more and more important because aesthetics requirements tend to spread over a wide variety of construction works. Even if it is difficult to clearly define what is ... [more ▼]

Concrete surface quality becomes more and more important because aesthetics requirements tend to spread over a wide variety of construction works. Even if it is difficult to clearly define what is beautiful or not, existing techniques maybe used to quantify aesthetic properties of concrete. As they mainly depend on formwork, the research project focuses on the reuse of two types of panels – plywood and OSB – and two types of release agents – vegetal and mineral oils. Evolution of surface properties is measured through lightness and absorption. For plywood formworks, beyond 80 reuses, a modification of surface quality is noticed; this is only 50 for OSB panels. For both types of formworks, the release oil doesn’t seem to have a major influence on formwork absorption. It is also observed that alkalis cause early degradation of the panels: release agents are not always efficient to avoid this phenomenon. Finally, if reuse doesn’t have any influence on the absorption of the plywood formworks, it is not the case for OSB formworks. [less ▲]

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See detailSecond harmonic generation to monitor the interactions of the antimicrobial mycosubtilin with membrane-mimicking interfacial monolayers
Nasir, Mehmet Nail ULg; Benichou, Emmanuel; Guez, Jean-Sébastien et al

in BioNanoScience (2012), 2(2), 108-112

Mycosubtilin is a strong antimicrobial agent belonging to the iturinic lipopeptide family which contains a single tyrosine residue. Its cell target has been shown to be the cytoplasmic membrane. This ... [more ▼]

Mycosubtilin is a strong antimicrobial agent belonging to the iturinic lipopeptide family which contains a single tyrosine residue. Its cell target has been shown to be the cytoplasmic membrane. This tyrosine residue has been previously shown to be essential for the biological activity of mycosubtilin. Since we have previously demonstrated that tyrosine, an aromatic amino acid, can be used as an endogenous probe for the frequency doubling process, the presence of a tyrosine residue in mycosubtilin allowed us to investigate the interactions of mycosubtilin with biomimetic lipid monolayers at the air–water interface by second harmonic generation (SHG). Mycosubtilin was added underneath dipalmitoylphosphatidylcholine or cholesterol monolayers at the air–water interface and significant increases in the surface pressure were observed in both cases. This observation demonstrates that mycosubtilin interacts with these biomimetic membranes. A light polarization resolved analysis of the SHG signals recovered for these two systems was then performed and confirmed that those interactions between the tyrosine residue in mycosubtilin and the membranes could be monitored by SHG. Furthermore, the differences exhibited by the nonlinear optical measurements for different membranes showed that these interactions depend on the nature of the biomimetic membrane present at the air–water interface. [less ▲]

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See detailTaking atypical response patterns into account: a multidimensional measurement model from item response theory
Raîche, Gilles; Magis, David ULg; Blais, Jean-Guy et al

in Simon, Marielle; Ercikan, Kadriye; Rousseau, Michel (Eds.) Improving large scale assessment in education: Theory, issues, and practice (2012)

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See detailBreaking Arches with Vibrations: The Role of Defects
Lozano, Celia; Lumay, Geoffroy ULg; Zuriguel, Iker et al

in Physical Review Letters (2012)

We present experimental and numerical results regarding the stability of arches against external vibrations. Two-dimensional strings of mutually stabilizing grains are geometrically analyzed and ... [more ▼]

We present experimental and numerical results regarding the stability of arches against external vibrations. Two-dimensional strings of mutually stabilizing grains are geometrically analyzed and subsequently submitted to a periodic forcing at fixed frequency and increasing amplitude. The main factor that determines the granular arch resistance against vibrations is the maximum angle among those formed between any particle of the arch and its two neighbors: the higher the maximum angle is, the easier it is to break the arch. On the basis of an analysis of the forces, a simple explanation is given for this dependence. From this, interesting information can be extracted about the expected magnitudes of normal forces and friction coefficients of the particles composing the arches. [less ▲]

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See detailDroit de la fonction publique
Durviaux, Ann-Lawrence ULg

Book published by Larcier (2012)

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See detailLa leggerezza: Modes d'emploi
Curreri, Luciano ULg; Lagazzi, Paolo

Book published by Nerosubianco (2012)

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See detailBeyond the Fourier heat conduction law and the thermal no-slip boundary condition
Lebon, Georgy ULg; Jou, D.; Dauby, Pierre ULg

in Physics Letters A (2012), 376(45), 2842-2846

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See detailAdaptation of a Murine Chronic GVH Model to Study Graft versus Myeloma Effect after Allogeneic Transplantation
Binsfeld, Marilène ULg; Belle, Ludovic ULg; Hannon, Muriel ULg et al

in Belgian Journal of Hematology (2012), Abstracts book(Supplement of 27th General Meeting of the Belgian Hematological Society), 16

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See detailRadicalismes et extrémismes de droite
Jamin, Jérôme ULg

in Bouhon, Frédéric; Reuchamps, Min (Eds.) Les systèmes électoraux de la Belgique (2012)

Depuis 1830, la Belgique a connu de nombreuses évolutions en matière électorale. Le XIXe siècle et le début du XXe sont notamment marqués par l’ouverture progressive de la participation de la population ... [more ▼]

Depuis 1830, la Belgique a connu de nombreuses évolutions en matière électorale. Le XIXe siècle et le début du XXe sont notamment marqués par l’ouverture progressive de la participation de la population aux opérations électorales et par leur rationalisation. Au cours des dernières décennies, le système électoral de la Belgique a laissé place à de multiples systèmes électoraux, dans le sillage de la fédéralisation du pays et de la construction européenne. Ainsi, à côté des organes provinciaux et communaux, on ne dénombre pas moins de sept assemblées dont les membres sont directement élus. Même si un certain nombre de règles sont communes à ces différentes institutions, il convient de considérer l’existence d’autant de systèmes électoraux distincts. À ce jour, aucune étude interdisciplinaire n’a fait systématiquement le point sur les systèmes électoraux de la Belgique. Cet ouvrage ambitionne de combler ce vide en réunissant de nombreux spécialistes du droit et de la science politique, mais également de la sociologie, de l’histoire et de la géographie. Une trentaine d’auteurs livrent leurs réflexions sur un thème qui gît au coeur de la vie démocratique d’un pays en pleine mutation. [less ▲]

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See detailManuel de procédure pénale
Franchimont, Michel; Jacobs, Ann ULg; Masset, Adrien ULg

Book published by Larcier (2012)

synthèse critique de la procédure pénale belge tenant compte à la fois de la législation, de la jurisprudence et de la doctrine.

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See detailLa jurisprudence récente en matière de libertés de circulation
Sibony, Anne-Lise ULg

Conference (2012)

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See detailQuality by design compliant analytical method validation
Rozet, Eric ULg; Ziemons, Eric ULg; Marini Djang'Eing'A, Roland ULg et al

in Analytical Chemistry (2012), 84

The concept of quality by design (QbD) has recently been adopted for the development of pharmaceutical processes to ensure a predefined product quality. Focus on applying the QbD concept to analytical ... [more ▼]

The concept of quality by design (QbD) has recently been adopted for the development of pharmaceutical processes to ensure a predefined product quality. Focus on applying the QbD concept to analytical methods has increased as it is fully integrated within pharmaceutical processes and especially in the process control strategy. In addition, there is the need to switch from the traditional checklist implementation of method validation requirements to a method validation approach that should provide a high level of assurance of method reliability in order to adequately measure the Critical Quality Attributes (CQAs) of the drug product. The intended purpose of analytical methods is directly related to the final decision that will be made with the results generated by these methods under study. The final aim for quantitative impurity assays is to correctly declare a substance or a product as compliant with respect to the corresponding product specifications. For content assays, the aim is similar: making the correct decision about product compliance with respect to their specification limits. It is for these reasons that the fitness of these methods should be defined, as they are key elements of the Analytical Target Profile (ATP). Therefore, validation criteria, corresponding acceptance limits and method validation decision approaches should be settled in accordance with the final use of these analytical procedures. This work proposes a general methodology to achieve this in order to align method validation within the QbD framework and philosophy. β-expectation tolerance intervals are implemented to decide about the validity of analytical methods. The proposed methodology is also applied to the validation of analytical procedures dedicated to the quantification of impurities or active product ingredients (API) in drug substances or drug products and its applicability is illustrated with two case studies. [less ▲]

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See detailStructural Chemistry and Spin-glass Behaviour of Nd18Li8Fe4TiO39
Thammajak, N; Battle, Peter D.; Grandjean, Fernande ULg et al

in Journal of Solid State Chemistry (2012), 187

Nd18Li8Fe4TiO39 has been synthesised and characterised by neutron powder diffraction, X-ray absorption spectroscopy, Mossbauer spectroscopy and magnetometry. The cubic structure (Pm3 n, a=411.97227(8) Å ... [more ▼]

Nd18Li8Fe4TiO39 has been synthesised and characterised by neutron powder diffraction, X-ray absorption spectroscopy, Mossbauer spectroscopy and magnetometry. The cubic structure (Pm3 n, a=411.97227(8) Å) is based on intersecting <1 1 1> chains comprised of alternating octahedral and trigonal-prismatic coordination sites. These chains lie within hexagonal-prismatic cavities formed by a Nd–O framework. The larger of the two crystallographically distinct octahedral sites, 8e, is occupied by iron, titanium and lithium in a ratio of 76:20:4; the smaller, 2a, is occupied by iron and titanium in a ratio of 79:21. The trigonal-prismatic site, 16i, is occupied by lithium and iron in a ratio of 98:2. The cations on the 2a sites are assigned as Ti4+and low-spin Fe4+, and those on the 16i sites as Li+ and Fe3+. The 8e sites are thought to be occupied by Li+, Fe3+ and Ti3+. Nd18Li8Fe4TiO39 undergoes a transition to a spin-glass state at 4.25(5) K. [less ▲]

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See detailFP6 PROHITECH project: Volume 3: Seismic Protection of historical buildings: experimental activity
Arangelovski, Toni; Altay Askar, Gülay; Aras, Fuat et al

Book published by Polimetrica (2012)

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