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See detailMagnetostructural effects in ligand stabilized Pd13 clusters: a density functional theory study
Fresch, Barbara ULg; Boyen, H.-G.; Remacle, Françoise ULg

in Nanoscale (2012), 4(14), 4138-4147

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See detailMagnetotail topology around substorm onset time
Meurant, M.; Donovan, E. F.; Gérard, Jean-Claude ULg et al

Conference (2006, December 01)

The time evolution of the magnetotail topology during minutes preceding and following substorm onset is an important question of the magnetospheric dynamic. The substorm onset is a local and explosive ... [more ▼]

The time evolution of the magnetotail topology during minutes preceding and following substorm onset is an important question of the magnetospheric dynamic. The substorm onset is a local and explosive phenomenon, which makes it difficult to describe with in situ data. In this study, we investigate this problem thanks the remote sensing data provided by the FUV camera onboard the IMAGE spacecraft. In the first part of this study, we use a set of IMAGE-FUV and GOES-8 simultaneous observations obtained during substorms periods to develop a model of the magnetic field elevation angle at geosynchronous orbit. In the second part, we use a set of 259 substorms observed by the IMAGE spacecraft between 2000 and 2002. Taking advantage of the global scale of the observations provided by IMAGE-FUV, we describe the time evolution of the magnetotail topology provided by the model. An interesting result shows that the field is symmetrically stretched around the onset position before the onset time and this symmetry is broken after onset, with a more important stretching duskward to the onset. [less ▲]

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See detailMagnetotransport of La0.5Ba0.5MnO3
Pekala, Marek; Drozd, V.; Fagnard, Jean-François ULg et al

in Journal of Applied Physics (2009), 105(1), 013923-013923-8

Physical properties of polycrystalline La0.5Ba0.5MnO3 are reported from low temperature (10 K) up to above room temperature. An aim has been to obtain microscopic parameters and to search for the ... [more ▼]

Physical properties of polycrystalline La0.5Ba0.5MnO3 are reported from low temperature (10 K) up to above room temperature. An aim has been to obtain microscopic parameters and to search for the characteristic lengths in terms of which one can discuss the interplay between magnetic, electric, and phonon excitations. The structural and magnetotransport measurements reveal a set of relatively high transition temperatures (near 300 K) between ferromagnetic/metallic and paramagnetic/semiconducting phases. It is found, in particular, that the so-called localization length increases from 0.085 to 0.24 nm when the magnetic field varies from 0 to 8 T. Moreover a “special field value” ~0.03 T is observed in the description of the electrical resistance. It cannot be presently distinguished whether it is the signature of a spin reorientation transition in the canted phase or a mere saturation field for aligning magnetic domains. The relatively high magnetoresistance effect (~=55% at 8 T and 10 K) makes the La0.5Ba0.5MnO3 a very interesting material for among others sensor applications. [less ▲]

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See detailMagnetotransport properties of a single grain boundary in a bulk La-Ca-Mn-O material
Vertruyen, Bénédicte ULg; Cloots, Rudi ULg; Rulmont, André ULg et al

in Journal of Applied Physics (2001), 90(11), 5692-5697

Besides the "intrinsic" colossal magnetoresistance effect observed in single crystals, the polycrystalline manganate compounds also exhibit an "extrinsic" magnetoresistance related to the presence of ... [more ▼]

Besides the "intrinsic" colossal magnetoresistance effect observed in single crystals, the polycrystalline manganate compounds also exhibit an "extrinsic" magnetoresistance related to the presence of grain boundaries. We report electrical transport and magnetic measurements carried out on a bigrain sample extracted from a floating zone method-grown rod of calcium doped lanthanum manganate. Electrical resistance was measured both within a grain and across the grain boundary, between 20 and 300 K and from 0 to 8 T. Magnetoresistance values up to 99% are reached within the grain. The temperature dependence of the resistance across the grain boundary displays a "foot-like" feature towards the bottom of the transition. Low field and high field magnetoresistance effects are examined. We compare our results for a "bulk" grain boundary to those obtained by other authors for bicrystal thin films and bulk polycrystalline materials. (C) 2001 American Institute of Physics. [less ▲]

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See detailMagnetotransport study of MgB2 superconductor
Mucha, Jan ULg; Pekala, Marek; Szydlowska, Jadwiga et al

in Superconductor Science and Technology (2003), 16(10), 1167-1172

Precise magnetotransport studies of heat and charge carriers in polycrystalline MgB2 show that magnetic fields up to 8 T remarkably influence electrical resistivity, thermoelectric power and thermal ... [more ▼]

Precise magnetotransport studies of heat and charge carriers in polycrystalline MgB2 show that magnetic fields up to 8 T remarkably influence electrical resistivity, thermoelectric power and thermal conductivity. The superconducting transition temperature shifts from 39 K to 19 K at 8 T as observed on electric signals. The temperature transition width is weakly broadened. Electron and phonon contributions to the thermal conductivity are separated and discussed. The Debye temperature calculated from a phonon drag thermoelectric power component is inconsistent with values derived through other effects. [less ▲]

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See detailMagnette Charles
Lanneau, Catherine ULg

in Nouvelle biographie nationale (2014)

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See detailThe magnitude and the extinction duration of the cocaine-induced conditioned locomotion-activated response are related to the number of cocaine injections paired with the testing context in C57BL/6J mice
Michel, Anne; Tambour, Sophie ULg; Tirelli, Ezio ULg

in Behavioural Brain Research (2003), 145(1-2), 113-123

Behavioural activation repeatedly induced by a stimulant in rodents can persist in the absence of the drug if the animals are tested in the context where the drug was previously given, a phenomenon often ... [more ▼]

Behavioural activation repeatedly induced by a stimulant in rodents can persist in the absence of the drug if the animals are tested in the context where the drug was previously given, a phenomenon often explained in terms of Pavlovian conditioning. The aim of this study was to verify whether the amplitude of the putative CR (the drug-like activity) increases with the number of the US-CS associations (the number of drug-context pairings), one of the most representative rules of Pavlovian conditioning. The effect of the number of trials on the speed of extinction was also considered. C57BL/6J mice received 3, 6 or 12 once-daily injections of either saline or 12 mg/kg (-)-cocaine hydrochloride (s.c.) in the same test context, a photocell activity-box in which they were tested for 60 min after every injection. Other groups received the same treatments outside of the test context (being placed in a novel cage tub after each injection). Twenty-four hours after the last treatment session, all mice were challenged with saline in the test context (test for conditioned activity), extinction sessions taking place on the three subsequent days. Sensitisation to the locomotor-activating effect of cocaine developed only amongst the animals injected 6 or 12 times, the magnitude of the last sensitised response being comparable for these two injections regimen. On saline challenge, only the animals that had received 6 or 12 cocaine injections showed significant conditioned activity (CR), with the greatest response occurring following 12 injections. The 6-trial group reached the level of non-significance after fewer extinction sessions than the 12-trial group; however, the rates of extinction did not differ (comparable regression coefficients and quasi-parallel curves). These results suggest that the amplitude of the CR (cocaine-like stimulation after saline), and perhaps less convincingly the duration of extinction, are functions of the number of the US-CS (cocaine-context) pairings, supporting the Pavlovian nature of post-sensitisation placebo drug-like effects. (C) 2003 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailMagnitude comparison in preschoolers: what counts ? Influence of perceptual variables.
Rousselle, Laurence ULg; Palmers, Emmanuelle; Noël, Marie-Pascale

in Journal of Experimental Child Psychology (2004), 87

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See detailMagnitude representation in children: Its development and dysfunction
Noël, Marie-Pascale; Rousselle, Laurence ULg

in Campbell, Jamie (Ed.) Handbook of Mathematical Cognition (2005)

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See detailMagnitude Representations in Williams Syndrome: Differential Acuity in Time, Space and Number Processing.
Rousselle, Laurence ULg; Dembour, Guy; Noël, Marie-Pascale

in PLoS ONE (2013), 8(8), 72621

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See detailMagnitudes des étoiles doubles.
Renson, Pierre ULg

in Ciel et Terre (1993), 109

Not Available

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See detailMagnon-polaron and spin-polaron signatures in the specific heat and electrical resistivity of La0.6Y0.1Ca0.3MnO3 in zero magnetic field and the effect of Mn - O - Mn bond environment
Ausloos, Marcel ULg; Hubert, L.; Dorbolo, Stéphane ULg et al

in Physical Review B (2002), 66(17),

La0.6Y0.1Ca0.3MnO3, an ABO(3) perovskite manganite oxide, exhibits a nontrivial behavior in the vicinity of the sharp peak found in the resistivity rho as a function of temperature T in zero magnetic ... [more ▼]

La0.6Y0.1Ca0.3MnO3, an ABO(3) perovskite manganite oxide, exhibits a nontrivial behavior in the vicinity of the sharp peak found in the resistivity rho as a function of temperature T in zero magnetic field. The various features seen on drho/dT are discussed in terms of competing phase transitions. They are related to the Mn-O-Mn bond environment depending on the content of the A crystallographic site. A Ginzburg-Landau type theory is presented for incorporating concurrent phase transitions. The specific heat C of such a compound is also examined from 50 to 200 K. A log-log analysis indicates different regimes. In the low temperature conducting ferromagnetic phase, a collective magnon signature (Csimilar or equal toT(3/2)) is found as for what are called magnon-polaron excitations. A Csimilar or equal toT(2/3) law is found at high temperature and discussed in terms of the fractal dimension of the conducting network of the weakly conducting (so-called insulating) phase and an Orbach estimate of the excitation spectral behaviors. The need of considering both independent spin scattering and collective spin scattering is thus emphasized. The report indicates a remarkable agreement for the Fisher-Langer formula, i.e., Csimilar todrho/dT at second order phase transitions. Within the Attfield model, we find an inverse square root relationship between the critical temperature(s) and the total local Mn-O-Mn strain. [less ▲]

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See detailA maġribī copy of the Kitāb al-Faraj baʿd aš-Šidda by the ʿIrāqī qāḍī at-Tanūḫī. Study of a University of Liège (Belgium) manuscript
Franssen, Elise ULg

Conference (2009, July)

Author introduces the Arabic manuscript collection in Liège, Belgium, which is not as widely known as it deserves to be. She singles out one particular manuscript, an 11/16th century copy of the well ... [more ▼]

Author introduces the Arabic manuscript collection in Liège, Belgium, which is not as widely known as it deserves to be. She singles out one particular manuscript, an 11/16th century copy of the well-known work Kitāb al-Faraj baʿd aš-Šidda, by the ʿIrāqī qāḍī at-Tanūhkhī (327-384/939-994). She describes the manuscript and places her detailed description within the framework of the modern scholarly and bibliographical references on Abbasid literature in general and on recent developments in codicology and paleography in particular. She also discusses the relationship of the Liège manuscript with some of the printed editions of the Kitāb al-Faraj baʿd aš-Šidda. [less ▲]

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See detailA maġribī copy of the Kitāb al-Faraj baʿd aš-Šidda, by the ʿIrāqī qāḍī at-Tanūḫī. Study of a Manuscript of Liège University (Belgium)
Franssen, Elise ULg

in Journal of Islamic Manuscripts (2010), 1

Author introduces the Arabic manuscript collection in Liège, Belgium, which is not as widely known as it deserves to be. She singles out one particular manuscript, an 11/16th century copy of the well ... [more ▼]

Author introduces the Arabic manuscript collection in Liège, Belgium, which is not as widely known as it deserves to be. She singles out one particular manuscript, an 11/16th century copy of the well-known work Kitāb al-Faraj baʿd aš-Šidda, by the ʿIrāqī qāḍī at-Tanūhkhī (327-384/939-994). She describes the manuscript and places her detailed description within the framework of the modern scholarly and bibliographical references on Abbasid literature in general and on recent developments in codicology and paleography in particular. She also discusses the relationship of the Liège manuscript with some of the printed editions of the Kitāb al-Faraj baʿd aš-Šidda. [less ▲]

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See detailMagritte y Wittgenstein : acuerdo y desacuerdo
Badir, Sémir ULg

in Tópicos del Seminario (2014), 30

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See detailMAGRITTE: an instrument suite for the solar atmospheric imaging assembly (AIA) aboard the Solar Dynamics Observatory
Rochus, Pierre ULg; Defise, Jean-Marc ULg; Halain, Jean-Philippe ULg et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2004, February 01)

The Solar Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory will characterize the dynamical evolution of the solar plasma from the chromosphere to the corona, and will follow the ... [more ▼]

The Solar Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory will characterize the dynamical evolution of the solar plasma from the chromosphere to the corona, and will follow the connection of plasma dynamics with magnetic activity throughout the solar atmosphere. The AIA consists of 7 high-resolution imaging telescopes in the following spectral bandpasses: 1215Å. Ly-a, 304 Å He II, 629 Å OV, 465 Å Ne VII, 195 Å Fe XII (includes Fe XXIV), 284 Å Fe XV, and 335 Å Fe XVI. The telescopes are grouped by instrumental approach: the MAGRITTE Filtergraphs (R. MAGRITTE, famous 20th Century Belgian Surrealistic Artist), five multilayer EUV channels with bandpasses ranging from 195 to 1216 Å, and the SPECTRE Spectroheliograph with one soft-EUV channel at OV 629 Å. They will be simultaneously operated with a 10-second imaging cadence. These two instruments, the electronic boxes and two redundant Guide Telescopes (GT) constitute the AIA suite. They will be mounted and coaligned on a dedicated common optical bench. The GTs will provide pointing jitter information to the whole SHARPP assembly. This paper presents the selected technologies, the different challenges, the trade-offs to be made in phase A, and the model philosophy. From a scientific viewpoint, the unique combination high temporal and spatial resolutions with the simultaneous multi-channel capability will allow MAGRITTE / SPECTRE to explore new domains in the dynamics of the solar atmosphere, in particular the fast small-scale phenomena. We show how the spectral channels of the different instruments were derived to fulfill the AIA scientific objectives, and we outline how this imager array will address key science issues, like the transition region and coronal waves or flare precursors, in coordination with other SDO experiments. We finally describe the real-time solar monitoring products that will be made available for space-weather forecasting applications. [less ▲]

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See detailMai 68 : un héritage clivé
Frère, Bruno ULg

in Revue du MAUSS (2009)

Tout le monde aura entendu ou lu dans la presse la façon dont l'actuel président français, initiateur d'une révolution conservatrice sans précédent en France, fustige l'esprit de 68. L'on pourrait s ... [more ▼]

Tout le monde aura entendu ou lu dans la presse la façon dont l'actuel président français, initiateur d'une révolution conservatrice sans précédent en France, fustige l'esprit de 68. L'on pourrait s'amuser d'un tel positionnement campé par un politicien qui, par ailleurs, n'a guère rechigné à afficher le comportement amoureux léger qu'on lui connaît et que n'auraient pas désavoués les étudiant(e)s de mai lorsqu'ils étaient sur les barricades, aux prises avec le conservatisme français en matière de moeurs. Mais mon propos sera ici d'une autre nature, bien qu'il s'inscrive dans un étonnement similaire face aux diatribes de Nicolas Sarkozy. En effet, il est probablement un second élément qui rappelle ce dernier au souvenir de cette révolution dont il veut « liquider l'héritage » : la pensée économique « libertarienne », née, pour sa déclinaison française, de l'improbable union entre l'esprit frondeur et libertaire de 68 et l'économie de marché [less ▲]

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See detailMai 68, les avatars d’une posture générationnelle. Ou comment Dany le Rouge est passé aux Verts
Sindaco, Sarah ULg

in COnTEXTES : Revue de Sociologie de la Littérature (2011), (8),

Detailed reference viewed: 33 (5 ULg)