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See detailLeucocytes and lipid particles filtration in suction blood during cardiopulmonary bypass: impact on kidney function evaluated with a monocentric prospective randomized study.
LAGNY, Marc-Gilbert ULg; KOCH, Jean-Noël ULg; BLAFFART, Francine ULg et al

Conference (2015, October 03)

OBJECTIVE: Cardiac surgery may be complicated by acute kidney injury (AKI). Cardiotomy suction during cardiopulmonary bypass (CPB) is deleterious. A few studies have demonstrated that shed mediastinal ... [more ▼]

OBJECTIVE: Cardiac surgery may be complicated by acute kidney injury (AKI). Cardiotomy suction during cardiopulmonary bypass (CPB) is deleterious. A few studies have demonstrated that shed mediastinal blood (SMB) suction during cardiopulmonary bypass (CPB) can increase inflammatory response and lipids emboli. These 2 factors contribute to the development of postoperative AKI. The RemoweLL (RemoweLeucoLipids, Eurosets™, Italy) filter is a recent designed cardiotomy with a multilayer filter for activated leucocytes filtration and a syphon for lipid particles sequestration. The SMB can be collected and filtered in this supplementary cardiotomy added to CPB circuit. The aim of this monocentric prospective study was to compare the specific RemoweLL cardiotomy filtration for suction blood during CPB and a conventional 40 µm filter (Admiral, Eurosets™, Italy). The primary goal was to evaluate the AKI within 48 hours after surgery using the Acute Kidney Injury Network classification (AKIN classification) but also measuring early specific biomarkers of AKI: serum Cystatine C and urinary neutrophil gelatinase-associated lipocalin (NGAL). METHODS: Sixty patients scheduled for elective cardiac surgery (aortic or mitral valvular combined or not with coronary bypass grafting) with a glomerular filtration rate (GFR) > 45mL/min. were randomly into 2 groups for SMB filtration: - Groupe 1 (n=30) with RemoweLL cardiotomy (Leucocytes and lipids filter); - Groupe 2 (n=30) with Admiral cardiotomy (conventional 40 µm filter). All components: venous reservoir, oxygenator and surface treatment were similar in both groups. [less ▲]

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See detailPour une vision intégrée du prévenir et du guérir
Vanmeerbeek, Marc ULg

Scientific conference (2015, October 02)

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See detailPréface
Marganne, Marie-Hélène ULg

in de Haro Sanchez, Magali (Ed.) Ecrire la magie dans l'antiquité. Actes du colloque international (Liège, 13-15 octobre 2011) (2015)

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See detailBaccio Bandinelli théoricien. Réflexions sur le "Libro del Disegno"
Marique, Charlotte ULg

Conference (2015, October 02)

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See detailNeurosciences et Psychiatrie : parallélisme ou convergence ?
Desseilles, Martin ULg

Scientific conference (2015, October 02)

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See detailNovel chitosan hydrogel for the treatment of osteoarthritis.
Henrotin, Yves ULg

Conference (2015, October 02)

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See detailConclusions
Valenti, Gianluca ULg; Miesse, Hélène ULg

Conference (2015, October 02)

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See detailPhénoménologie de l’électrochoc : Une reprise du cas Jonas
Englebert, Jérôme ULg; Cormann, Grégory ULg

Scientific conference (2015, October 02)

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See detailSpectral Variations of Of?p Oblique Magnetic Rotator Candidates in the Magellanic Clouds
Walborn, Nolan R.; Morrell, Nidia I.; Nazé, Yaël ULg et al

in Astronomical Journal (The) (2015), 150

Optical spectroscopic monitoring has been conducted of two O stars in the SMC and one in the LMC, the spectral characteristics of which place them in the Of?p category, which has been established in the ... [more ▼]

Optical spectroscopic monitoring has been conducted of two O stars in the SMC and one in the LMC, the spectral characteristics of which place them in the Of?p category, which has been established in the Galaxy to consist of oblique magnetic rotators. All of these Magellanic stars show systematic spectral variations typical of the Of?p class, further strengthening their magnetic candidacy to the point of virtual certainty. The spectral variations are related to photometric variations derived from Optical Gravitational Lensing Experiment data by Nazé et al. in a parallel study, which yields rotational periods for two of them. Now circular spectropolarimetry is required to measure their fields, and ultraviolet spectroscopy to further characterize their low-metallicity, magnetically confined winds, in support of hydrodynamical analyses. [less ▲]

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See detailLe droit de vote à distance: Emergence d'un objet de recherche et apport au champ de la sociologie électorale
Lafleur, Jean-Michel ULg

Conference (2015, October 01)

Dans cet article, nous présentons tout d’abord l’émergence du droit de vote à distance comme objet de recherche dans le champ la théorie politique et des études migratoires. Ces travaux caractérisés par ... [more ▼]

Dans cet article, nous présentons tout d’abord l’émergence du droit de vote à distance comme objet de recherche dans le champ la théorie politique et des études migratoires. Ces travaux caractérisés par leur dimension exploratoire, nous permettent toutefois de définir le droit de vote à distance et d’identifier les caractéristiques essentielles qui le différencie aujourd’hui des pratiques antérieures. Nous présentons ensuite les travaux sur la diffusion de la norme qui depuis moins d’une décennie ont constitué le principal angle d’entrée de la science politique sur le droit de vote à distance. Dans la troisième et dernière partie de l’article, nous défendons enfin l’intérêt d’une approche transnationale des questions électorales dans les études électorales. Cette approche, comme nous le défendons, permet d’éclairer non seulement le comportement des expatriés mais plus largement la transformation des pratiques électorales ici et là-bas. [less ▲]

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See detailBuilding a bridge between Liege and Asturias : the case of zinc
Peters, Arnaud ULg

Conference (2015, October 01)

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See detailCoherence and many-body effects in the transport of Bose–Einstein condensates
Dujardin, Julien ULg

Doctoral thesis (2015)

This thesis presents investigations on the interplay of coherence and many-body effects in the quasi one-dimensional transport of Bose-Einstein condensates (BEC) through scattering potentials. Such ... [more ▼]

This thesis presents investigations on the interplay of coherence and many-body effects in the quasi one-dimensional transport of Bose-Einstein condensates (BEC) through scattering potentials. Such configurations can be realized with guided atom lasers that provide a coherent atomic beam. An exact theoretical description of the dynamics is out of reach due to the presence atom-atom interactions. Different levels of approximations are nevertheless possible with their strengths and weaknesses. The mean-field approximation, where the dynamics of the BEC is governed by the Gross-Pitaevskii equation, is most commonly used in the field of ultracold atoms. In this thesis the truncated Wigner method is used to go beyond the standard Gross-Pitaevskii description. This method is adapted in order to study the scattering of Bose-Einstein condensates in one-dimensional waveguides where atom-atom interactions and external potentials are nonvanishing only in a finite region of space. In this case, the truncated Wigner method is combined with the smooth exterior complex scaling method and incorporates quantum noise that originate from the vacuum fluctuations in the waveguide. Inelastic scattering is shown to play a major role in the resonant transport of BEC through a symmetric double potential barrier effectively forming an atomic quantum dot. Indeed, fully resonant transmission is prohibited and incoherent atoms as well as collective oscillations are detected in the transmitted beam. It is also shown that inelastic scattering destroys Anderson localization in the case of transport through disordered potentials. The classical (incoherent) ohmic transmission is recovered for finite atom-atom interactions. The validity of the truncated Wigner method is then assessed using the semiclassical van Vleck-Gutzwiller propagator in the Fock space of the many-body system. It is shown that the truncated Wigner method corresponds to the so-called diagonal approximation, and it is possible to identify the leading correction to the truncated Wigner results, which is provided by the so-called coherent backscattering (CBS) contribution. Coherent basckattering in Fock space is a genuine quantum many-body effect that lies beyond the reach of any mean-field approach. For the case of closed Bose-Hubbard models, the relevance of CBS is confirmed by numerically comparing the (classical) truncated Wigner evolution probabilities to the exact quantum probabilities in Bose-Hubbard models: While a CBS-induced enhancement of the return probability to the initial state is clearly seen in the exact quantum simulations of the bosonic many-body system, this enhancement is absent in the classical calculations. The magnitude and dependence of the CBS contribution on gauge fields, which break time-reversal invariance, is numerically confirmed. For the case of disordered open systems, it can be shown that this contribution as well as next-to leading order contributions vanish thereby confirming the validity of the truncated Wigner method. [less ▲]

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See detailStroboscopic phenomena in superconductors with dynamic pinning landscape
Jelic, Zeljko ULg; Milosevic, Milorad; Van de Vondel, Joris et al

in Scientific Reports (2015), 5

Introducing artificial pinning centers is a well established strategy to trap quantum vortices and increase the maximal magnetic field and applied electric current that a superconductor can sustain ... [more ▼]

Introducing artificial pinning centers is a well established strategy to trap quantum vortices and increase the maximal magnetic field and applied electric current that a superconductor can sustain without dissipation. In case of spatially periodic pinning, a clear enhancement of the superconducting critical current arises when commensurability between the vortex configurations and the pinning landscape occurs. With recent achievements in (ultrafast) optics and nanoengineered plasmonics it has become possible to exploit the interaction of light with superconductivity, and create not only spatially periodic imprints on the superconducting condensate, but also temporally periodic ones. Here we show that in the latter case, temporal matching phenomena develop, caused by stroboscopic commensurability between the characteristic frequency of the vortex motion under applied current and the frequency of the dynamic pinning. The matching resonances persist in a broad parameter space, including magnetic field, driving current, or material purity, giving rise to unusual features such as externally variable resistance/impedance and Shapiro steps in current-voltage characteristics. All features are tunable by the frequency of the dynamic pinning landscape. These findings open further exploration avenues for using flashing, spatially engineered, and/or mobile excitations on superconductors, permitting us to achieve advanced functionalities. [less ▲]

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See detailZigzag antiferromagnetic quantum ground state in monoclinic honeycomb lattice antimonates A3Ni2SbO6 (A=Li, Na)
Zvereva, E.A.; Stratan, M.I.; Ovchenkov, Y.A. et al

in Physical Review. B: Condensed Matter and Materials Physics (2015), 92

We present a comprehensive experimental and theoretical study of the electronic and magnetic properties of two quasi-two-dimensional (2D) honeycomb-lattice monoclinic compounds A3Ni2SbO6 (A=Li, Na ... [more ▼]

We present a comprehensive experimental and theoretical study of the electronic and magnetic properties of two quasi-two-dimensional (2D) honeycomb-lattice monoclinic compounds A3Ni2SbO6 (A=Li, Na). Magnetic susceptibility and specific heat data are consistent with the onset of antiferromagnetic (AFM) long range order at low temperatures with Néel temperatures ~ 14 and 16 K for Li3Ni2SbO6 and Na3Ni2SbO6, respectively. The effective magnetic moments of 4.3 Bohr magnetons/f.u. (Li3Ni2SbO6) and 4.4 Bohr magnetons/f.u. (Na3Ni2SbO6) indicate that Ni2+ is in a high-spin configuration (S=1). The temperature dependence of the inverse magnetic susceptibility follows the Curie-Weiss law in the high-temperature region and shows positive values of the Weiss temperature ~ 8 K (Li3Ni2SbO6) and ~12 K (Na3Ni2SbO6) pointing to the presence of non-negligible ferromagnetic interactions, although the system orders AFM at low temperatures. In addition, the magnetization curves reveal a field-induced (spin-flop type) transition below TN that can be related to the magnetocrystalline anisotropy in these systems. These observations are in agreement with density functional theory calculations, which show that both antiferromagnetic and ferromagnetic intralayer spin exchange couplings between Ni2+ ions are present in the honeycomb planes supporting a zigzag antiferromagnetic ground state. Based on our experimental measurements and theoretical calculations we propose magnetic phase diagrams for the two compounds. [less ▲]

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See detailComment décrire la musique expérimentale ? Le cas de Vital Weekly
Claisse, Frédéric ULg

Conference (2015, October 01)

Publiée de manière interrompue sous forme de courrier hebdomadaire depuis 1995, le magazine Vital Weekly est un observateur privilégié de vingt ans d’évolution dans le domaine des musiques expérimentales ... [more ▼]

Publiée de manière interrompue sous forme de courrier hebdomadaire depuis 1995, le magazine Vital Weekly est un observateur privilégié de vingt ans d’évolution dans le domaine des musiques expérimentales. La communication revient sur ce corpus de 1001 numéros, qui voit les chroniqueurs progressivement inventer une forme de critique musicale radicale, gratuite et libre d’accès, sans prétention stylistique ou journalistique, visant l’informativité avant tout, à destination d’une communauté de lecteurs dont beaucoup sont eux-mêmes producteurs ou musiciens. Le magazine illustre la situation hybride des musiques expérimentales, appellation commode et fourre-tout pour des pratiques musicales extrêmement diversifiées, qui doivent autant aux traditions « savantes » du XXe siècle (field recordings, musique concrète, musiques électro-acoustiques, poésie sonore, …) qu’à l’esprit Do-It-Yourself et à l’esthétique industrielle de la cassette culture ayant émergé au tournant des années 1970-1980. D’inspiration pragmatique, l’analyse sociologique présentée ici prend au sérieux l’épreuve perceptive que représente pour le chroniqueur la rencontre avec un matériau sonore qui défie le jugement esthétique. Exemples à l’appui, il s’agit d’expliciter les « prises » de la critique sous contrainte de descriptivité : quels sont les repères conventionnels sur lesquels s’appuyer pour situer l’objet musical dans un espace structuré (paratexte, épitexte, descripteurs de genre, références intertextuelles) ? quels sont les registres (étrangeté, malaise, onirisme, puissance, intimité, présence à soi, matérialité et textures) qui permettent de transmettre au lecteur l’expérience sensible d’un face-à-face avec un objet sonore bouleversant ? [less ▲]

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See detailThe far-ultraviolet main auroral emission at Jupiter – Part 2: Vertical emission profile
Bonfond, Bertrand ULg; Gustin, Jacques ULg; Gérard, Jean-Claude ULg et al

in Annales Geophysicae (2015), 33

The aurorae at Jupiter are made up of many different features associated with a variety of generation mechanisms. The main auroral emission, also known as the main oval, is the most prominent of them as ... [more ▼]

The aurorae at Jupiter are made up of many different features associated with a variety of generation mechanisms. The main auroral emission, also known as the main oval, is the most prominent of them as it accounts for approximately half of the total power emitted by the aurorae in the ultraviolet range. The energy of the precipitating electrons is a crucial parameter to characterize the processes at play which give rise to these auroral emissions, and the altitude of the emissions directly depends on this energy. Here we make use of far-UV (FUV) images acquired with the Advanced Camera for Surveys on board the Hubble Space Telescope and spectra acquired with the Space Telescope Imaging Spectrograph to measure the vertical profile of the main emissions. The altitude of the brightness peak as seen above the limb is ~ 400 km, which is significantly higher than the 250 km measured in the post-dusk sector by Galileo in the visible domain. However, a detailed analysis of the effect of hydrocarbon absorption, including both simulations and FUV spectral observations, indicates that FUV apparent vertical profiles should be considered with caution, as these observations are not incompatible with an emission peak located at 250 km. The analysis also calls for spectral observations to be carried out with an optimized geometry in order to remove observational ambiguities. [less ▲]

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