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See detailHierarchical clustering of brain activity during human nonrapid eye movement sleep.
Boly, Mélanie ULg; Perlbarg, V; Marrelec, G et al

in Proceedings of the National Academy of Sciences of the United States of America (2012)

Consciousness is reduced during nonrapid eye movement (NREM) sleep due to changes in brain function that are still poorly understood. Here, we tested the hypothesis that impaired consciousness during NREM ... [more ▼]

Consciousness is reduced during nonrapid eye movement (NREM) sleep due to changes in brain function that are still poorly understood. Here, we tested the hypothesis that impaired consciousness during NREM sleep is associated with an increased modularity of brain activity. Cerebral connectivity was quantified in resting-state functional magnetic resonance imaging times series acquired in 13 healthy volunteers during wakefulness and NREM sleep. The analysis revealed a modification of the hierarchical organization of large-scale networks into smaller independent modules during NREM sleep, independently from EEG markers of the slow oscillation. Such modifications in brain connectivity, possibly driven by sleep ultraslow oscillations, could hinder the brain's ability to integrate information and account for decreased consciousness during NREM sleep. [less ▲]

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See detailHierarchical macro-mesoporous oxides and carbons: towards new and more efficient hierarchical catalysis
Léonard, Alexandre ULg; Vantomme, Aurélien; Su, Bao-Lian

in Cao, Guozhong; Brinker, Jeffrey C (Eds.) Annual Review of Nano Research-Volume 2 (2008)

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See detailHierarchical multimodal mesoporous carbon materials with parallel macrochannels
Su, Bao-Lian; Vantomme, Aurelien; Surahy, Lidwine et al

in Chemistry of Materials (2007), 19(13), 3325-3333

Hierarchically structured multimodal meso-macroporous carbon materials have been prepared by using the nanoreplication of the mesoporous walls of a meso-macroporous zirconia exotemplate. Like the zirconia ... [more ▼]

Hierarchically structured multimodal meso-macroporous carbon materials have been prepared by using the nanoreplication of the mesoporous walls of a meso-macroporous zirconia exotemplate. Like the zirconia exotemplate, the pure carbon material possesses funnel shaped straight macrochannels, parallel to each other and perpendicular to the tangent of the particles' dense mesoporous shell. As a result of the funnel-like shape, each macrochannel has a pore size gradient with a large opening centered at 300-700 nm. The walls of the macrochannels and the dense mesoporous shells are formed by a hierarchical mesostructured porous system with uniform mesopore sizes centered at 3, 15-17, and 25-50 nm. Macrochannels are interconnected with hierarchically mesostructured walls and shells. A high surface area of 950 m(2)/g with a mesopore volume of 0.44 cm(3)/g is obtained. The possibility of the nanoreplication of other meso-macroporous oxides such as aluminosilicates, titania, and niobium oxide with different macrochannel size, shape, and organization has also been studied to generate meso-macroporous carbon materials with different organizations of the macrochannels. [less ▲]

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See detailHierarchical Porous TiO2 thin films by soft and dual templating: A quantitative approach of specific surface and porosity
Henrist, Catherine ULg; Cloots, Rudi ULg; Colson, Pierre ULg et al

Poster (2013, March)

Hierarchical porous structures, with different pore sizes, constitute an important field of research for many applications. However, increasing the pore size results in the decrease of specific surface ... [more ▼]

Hierarchical porous structures, with different pore sizes, constitute an important field of research for many applications. However, increasing the pore size results in the decrease of specific surface. There is a need to quantify and predict the resulting porosity and specific surface. We have prepared hierarchical porous TiO2 thin films either by surfactant templating (soft) or dual surfactant/microspheres templating (soft/hard). They all show narrow, bimodal distribution of pores. Soft templating route leads to very thin films showing high specific surface and bimodal porosity with diameters of 10 nm and 54 nm. Dual templating route combines a Pluronic surfactant-based precursor solution with polystyrene (PS) microspheres (diam. 250 nm) in a one-pot simple process. This gives thicker films with a bimodal distribution of pores (8 nm and 165-200 nm). The dye loading of hierarchical films is compared to pure Pluronic-templated TiO2 films and shows a relative decrease of 29% for Single Templating (ST) and 43% for Dual Templating (DT-250). Finally, a geometrical model is proposed and validated for each system, based on the agreement between calculated specific surfaces and experimental dye loading with N719 dye. [less ▲]

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See detailHierarchical state estimation
Pavella, Mania ULg; Van Cutsem, Thierry ULg; Horward, Jean-Luc ULg et al

in International Journal of Electrical Power & Energy Systems (1980), 2

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See detailHierarchical state estimator : a new way for large power systems estimation
Van Cutsem, Thierry ULg; Horward, Jean-Luc ULg; Pavella, Mania ULg

in Mathematics & Computers in Simulation (1980), 22

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See detailHierarchically mesoporous/macroporous metal oxides templated from polyethylene oxide surfactant assemblies
Blin, J.-L.; Léonard, Alexandre ULg; Yuan, Z.-Y. et al

in Angewandte Chemie International Edition (2003), 42(25), 2872-2875

Wormhole-like mesoporous walls are observed within macroporous metal oxides that were synthesized in one step using nonionic alkyl-PEO surfactants as templates. The uniform macropores have a funnel-like ... [more ▼]

Wormhole-like mesoporous walls are observed within macroporous metal oxides that were synthesized in one step using nonionic alkyl-PEO surfactants as templates. The uniform macropores have a funnel-like shape (tapered towards the center) and are arranged parallel to each other and perpendicular to the tangent of the particle surface (see micrographs). The mesochannels are interconnected with funnel-like macrochannels. [less ▲]

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See detailHierarchically nanostructured porous functional ceramics
Vantomme, A.; Léonard, Alexandre ULg; Yuan, Z.-Y. et al

in Key Engineering Materials [=KEM] (2007), 336-338 III

We demonstrate here a self-formation phenomenon of hierarchy with multiple-scaled porosity. Macrochanneled structures, labelled as CMI-7, with openings ranging from 0.5 to 5.0 microns and wormhole-like ... [more ▼]

We demonstrate here a self-formation phenomenon of hierarchy with multiple-scaled porosity. Macrochanneled structures, labelled as CMI-7, with openings ranging from 0.5 to 5.0 microns and wormhole-like mesoporous walls with various ceramic compositions, such as ZrO2, TiO2, Al 2O3, Y2O3, ZrO2-SiO 2, ZrO2-Tio2, ZrO2-Y 2O3,..., aluminosilicates, aluminophosphates, silicoaluminophosphates, metallophosphates, can be prepared by just controlling the hydrolysis and polycondensation rates of the pre-selected ceramic sources. The macrochannels (funnel-like or straight) are well parallel each other and perpendicular to the tangent of the particles' surface. These hierarchical porous ceramics can be used in catalysis, separation and for immobilization of biological molecules and even microorganisms for filtration and bioreactor applications. [less ▲]

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See detailLa hiérarchie des merveilles : le paradoxon entre perception du divin et du pouvoir dans la culture hellénistique
Caneva, Stefano ULg

Scientific conference (2012, November 14)

Le texte discute les émotions d’étonnement, d’émerveillement, d’admiration, générées par la rencontre avec quelque chose d’hors du commun et d’exceptionnel, et leur fonction par rapport à la ... [more ▼]

Le texte discute les émotions d’étonnement, d’émerveillement, d’admiration, générées par la rencontre avec quelque chose d’hors du commun et d’exceptionnel, et leur fonction par rapport à la représentation du divin. Evidemment, le sujet qui dérive de ce propos est potentiellement immense et sans limite, mais j'ai restreint ma perspective sur l’Egypte ptolémaïque du IIIe siècle, en particulier sous le règne de Ptolémée II (285/4-247/246). Mon intérêt n’est donc pas d’offrir une documentation exhaustive, mais plutôt de vérifier , à l’aide d’incursions dans des dossiers précis, la validité de quelques hypothèses assez répandues, mais souvent acceptées au niveau bibliographique plutôt qu’étudiées dans les différents volets culturels et religieux que les sources nous invitent à creuser : 1) le goût pour le spectaculaire connut un succès particulier à l’époque hellénistique, surtout à travers le médium de l’opsis, la vue ; 2) l’exhibition d’objets et de scènes spectaculaires et hors du commun, ainsi que les émotions d’étonnement et d’émerveillement qui sont engendrées, acquirent un rôle de premier plan dans la communication religieuse entre les sphères humaine et divine ; 3) ce lien particulier entre le spectacle et la manifestation de la puissance divine fut promu et adopté par les cours hellénistiques afin de développer une représentation efficace de la puissance divine, en particulier par rapport aux divinités proches des intérêts idéologiques des souverains, et donc aussi aux souverains eux-mêmes, récemment élevés, par le biais des cultes royaux, au statut de puissances protectrices et bienveillantes envers leurs sujets. [less ▲]

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See detailLa hiérarchie sémiotique
Badir, Sémir ULg

in Hébert, Louis (Ed.) Signo (2006)

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See detailHiérarchisation énonciative, prismes génériques et effet de politisation
Provenzano, François ULg; Goin, Emilie ULg

Conference (2013, April 19)

Cette présentation aborde la question des genres et de leurs effets interprétatifs par le biais de l’énonciation et, plus particulièrement, par le biais des jeux de hiérarchisation énonciative dont ... [more ▼]

Cette présentation aborde la question des genres et de leurs effets interprétatifs par le biais de l’énonciation et, plus particulièrement, par le biais des jeux de hiérarchisation énonciative dont peuvent faire l’objet divers genres de discours. Nous avons choisi de contraster deux genres de discours a priori très différents (discours politique et littéraire) de manière à dépasser la conception du genre comme un ensemble de données situationnelles ou textuelles, pour y voir un double principe de transfert entre ces deux ensembles. Entre la situation et le texte, le genre (roman, témoignage, harangue, etc.) impose certaines routines communicationnelles ; entre le texte et la situation, c’est d’une autre définition du genre dont on a besoin, celle du genre comme activation d’un parcours au sein d’un espace de possibles interprétatifs, donnant ainsi au texte une orientation argumentative, une consistance évènementielle et une valeur d’acte performatif. Nous pensons que dans cette seconde acception, le genre – ici, l’effet politisant – est susceptible de généralisation, tout comme le sont les genres envisagés plus traditionnellement à partir du pôle de la production. [less ▲]

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See detailHierarchy and scales in marine ecohydrodynamics
Nihoul, Jacques ULg; Djenidi, Salim ULg

in Earth-Science Reviews (1991), 31(3-4), 255-277

Recent investigations reveal, in marine ecosystems, an ecohydrodynamic hierarchical organization resulting from the different rates of ecological processes confronted to a multi-scale physical environment ... [more ▼]

Recent investigations reveal, in marine ecosystems, an ecohydrodynamic hierarchical organization resulting from the different rates of ecological processes confronted to a multi-scale physical environment. Major marine hydrodynamic processes are briefly analyzed here in an ecohydrodynamic perspective, emphasizing the effects they have on ecosystems at different levels of hierarchy and identifying appropriate “spectral windows” for modelling. A case study application to the Northern Bering Sea's Summer Ecohydrodynamics is given in illustration. [less ▲]

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See detailLes hiéroglyphes à l'heure de l'informatique
Winand, Jean ULg

Scientific conference (2014, February 13)

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See detailLes hiéroglyphes égyptiens
Winand, Jean ULg

Book published by Presses universitaires de France (2013)

Detailed reference viewed: 34 (3 ULg)
See detailLes hiérothytes. Recherche institutionnelle
Winand, Jean ULg

Book (1990)

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See detailLes hiértothytes. Recherche institutionnelle
Winand, Jean ULg

Master's dissertation (1983)

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