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See detailThe nonlinear optical, magnetic, and Mossbauer spectral properties of some iron(III) doped silica xerogels
Rebbouh, L.; Rosso, Vanessa ULg; Renotte, Yvon ULg et al

in Journal of Materials Science (2006), 41(10), 2839-2849

Iron(III) species dispersed in silica have been synthesized with a sol-gel process. The iron(III) was introduced as the acetylacetonate complex into a solution of tetraethoxysilane to yield, after ... [more ▼]

Iron(III) species dispersed in silica have been synthesized with a sol-gel process. The iron(III) was introduced as the acetylacetonate complex into a solution of tetraethoxysilane to yield, after evaporative drying, pellets or monoliths. Two gels were dried very slowly over a period of five months in order to prepare a defect free monolith useful for nonlinear optical studies. Z-scan experimental studies on the resulting, transparent, monolithic, doped solid revealed an optical Kerr effect, a third order nonlinear optical phenomenon showing a linear dependence of the refractive index on the irradiance with a nonlinear refractive index, n(2), of -1.95 x 10(-11) cm(2)/W. Magnetic susceptibility studies between 4.2 and 295 K revealed paramagnetic behavior with a Curie constant of 4.433 (emu/mol)K and a Weiss temperature of -7.1 K. Magnetization studies at 5 K and at applied fields of up to 4 T and Mossbauer spectral studies between 4.2 and 295 K revealed a 50:50 mixture of paramagnetic species and nanoparticles with an average particle radius of 1.3 +/- 0.2 nm. A blocking temperature of 70 K and a magnetic anisotropy energy of 2.4 x 10(5) J/m(3) stop are derived from the Mossbauer spectra. (c) 2006 Springer Science + Business Media, Inc. [less ▲]

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See detailCase study: Control systems for capacitive inertial sensors
Kraft, Michael ULg

in Gaura, Elena; Newman, Robert (Eds.) Smart MEMS and Sensor Systems (2006)

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See detailLe maintien dans l'emploi des travailleurs âgés ou la gestion des âges.
Bertrand, Françoise ULg; Hansez, Isabelle ULg; De Keyser, Véronique ULg

in Chasseigne, G.; Lassarre, D. (Eds.) Stress et Société. Volume III (2006)

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See detailD'Anatole France à Jean Paulhan : Terreur et Littérature
Denis, Benoît ULg

in Etudes Sartriennes (2006), (11), 81-97

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See detailMeasure of phonon-number moments and motional quadratures through infinitesimal-time probing of trapped ions
Bastin, Thierry ULg; von Zanthier, J.; Solano, E.

in Journal of Physics : B Atomic Molecular & Optical Physics (2006), 39

A method for gaining information about the phonon-number moments and the generalized nonlinear and linear quadratures in the motion of trapped ions (in particular, position and momentum) is proposed ... [more ▼]

A method for gaining information about the phonon-number moments and the generalized nonlinear and linear quadratures in the motion of trapped ions (in particular, position and momentum) is proposed, valid inside and outside the Lamb-Dicke regime. It is based on the measurement of first time derivatives of electronic populations, evaluated at the motion-probe interaction time tau = 0. In contrast to other state-reconstruction proposals, based on measuring Rabi oscillations or dispersive interactions, the present scheme can be performed resonantly at infinitesimal short motion-probe interaction times, remaining thus insensitive to decoherence processes. [less ▲]

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See detailLa régénération des espèces forestières vulnérables à l'Est du Cameroun : cas de Milicia excelsa
Daïnou, Kasso ULg; Doucet, Jean-Louis ULg; Mahy, Grégory ULg

Conference (2006)

Au Cameroun, le processus de la gestion durable des forêts a conduit une société d'exploitation forestière industrielle à procéder depuis quelques années, en partenariat avec des institutions de recherche ... [more ▼]

Au Cameroun, le processus de la gestion durable des forêts a conduit une société d'exploitation forestière industrielle à procéder depuis quelques années, en partenariat avec des institutions de recherche locales ou internationales, à des études scientifiques d'espèces identifiées comme vulnérable dans ses concessions. A ce titre, la détermination de techniques d'interventions sylvicoles pragmatiques ainsi que l'écologie d'espèces telles que l'iroko, Milicia excelsa sont étudiées afin de comprendre et de remédier au faible niveau de régénération naturelle. Les observations portent d'une part sur les performances de fructification (phénologie, pluie de graine, germination) et de dispersion des semences, et d'autre part, sur la dynamique de populations naturelles de juvéniles. Etant donné qu'une faible performance de régénération peut être due à la consanguinité, elle-même résultant de la raréfaction des populations, il est prévu également une analyse de la diversité génétique locale. Parallèlement, des essais de plantations permettent de juger des effets de différents facteurs abiotiques ou biotiques sur la dynamique des plantules. [less ▲]

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See detailLes pouvoirs publics, entre prérogative de puissance publique et activité économique
Thirion, Nicolas ULg

in Liber Amicorum Jacques Malherbe (2006)

Etude visant à déterminer dans quelle mesure les activités des pouvoirs publics peuvent être soumises aux règles de concurrence, européennes ou nationales

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See detailLes dimensions du capital social : quelle cohérence pour des indicateurs au coeur de la théorie ?
Italiano, Patrick ULg

in Houard, Jean; Jacquemain, Marc (Eds.) Capital social et dynamique régionale (2006)

Analyse statistique des corrélations entre les dimensions structurelles et cognitives du concept de capital social à partir de données d'enquête

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See detailDu droit commercial au droit de l'entreprise: nouveau plaidoyer pour les faiseurs de systèmes
Thirion, Nicolas ULg

in Revue de la Faculté de Droit de l'Université de Liège (2006)

Etude visant à conférer au droit commercial une cohérence fondée sur sa raison d'être: la mise en oeuvre, dans la sphère juridique, des principes au fondement de la pensée libérale

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See detailSound production mechanism in Amphiprion clarkii (Teleostei: Pomacentridae)
Colleye, Orphal ULg; Herrel, Anthony; Vandewalle, Pierre ULg et al

Poster (2006)

In the family Pomacentridae, six genera were reported as sound producers: Amphiprion, Dascyllus, Stegastes, Chromis, Abudefduf and Plectroglyphidodon. The anemonefishes (Amphiprioninae) live in social ... [more ▼]

In the family Pomacentridae, six genera were reported as sound producers: Amphiprion, Dascyllus, Stegastes, Chromis, Abudefduf and Plectroglyphidodon. The anemonefishes (Amphiprioninae) live in social group in association with sea anemones, which protect them from predators. Their sound emissions seem involved in courtship and territorial defense, contributing to both survival and reproductive success. However, the mechanism of sound production is unresolved. It has been hypothesized that it involves swimbladder or the action of the pharyngeal jaws amplified by swimbladder. The aim of this study was to understand the sonic mechanism involved in the agonistic sounds in Amphiprion clarkii. The approach consists in high-speed cineradiography and functional morphology. During agonistic sounds (pops), fishes perform different movements such as skull elevation, pectoral girdle retraction, hyoid lowering and mouth closing. Pops are produced when the hyoid is completely lowered and the mouth closed. The simultaneous realization of these movements was never observed in teleost. In Amphiprion sp., it is possible due to an additional ligament inserted on the hyoid bar and on the inner lower jaw. The hyoid lowering combined to the closing (and thus the elevation) of the mandible could generate a tension of the ligament, provoking its vibration [less ▲]

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See detailEntrepreneuriat wallon, identité et capital social
Guyot, Jean-Luc; Italiano, Patrick ULg

in Houard, Jean; Jacquemain, Marc (Eds.) Capital social et dynamique régionale (2006)

Etude statistique des motivations et freins à l'entrepreneuriat, avec une attention particulière pour les dimensions du capital social, à partir de données d'enquête

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See detailThe prospects of detecting exo-planets with the Ground-based European Nulling Interferometer Experiment (GENIE)
den Hartog, R.; Absil, Olivier ULg; Gondoin, P. et al

in Aime, C.; Vakili, F. (Eds.) Direct Imaging of Exoplanets: Science & Techniques (2006)

The European Space Agency's Darwin and NASA's Terrestrial Planet Finder (TPF) are among the most challenging space science missions ever considered. Their principal objective is to detect Earth-like ... [more ▼]

The European Space Agency's Darwin and NASA's Terrestrial Planet Finder (TPF) are among the most challenging space science missions ever considered. Their principal objective is to detect Earth-like planets around nearby stars and to characterize their atmospheres. Darwin and TPF-I are currently conceived as nulling interferometers with free-flying telescopes. Within the frame of the Darwin program, the ESA and the European Southern Observatory (ESO), supported by European industries and scientific institutes, have performed two parallel Phase A studies of a ground-based nulling interferometry experiment (GENIE) at the site of ESO's Very Large Telescope Interferometer (VLTI) in Paranal, Chile. GENIE will demonstrate several key technologies required for the Darwin mission. Its science objectives include the detection and characterization of dust disks and low-mass companions around nearby stars. These studies have established detailed instrumental designs, in which GENIE will operate in the L' band around 3.8 microns as a single Bracewell nulling or constructive interferometer, using either two Auxiliary or two Unit Telescopes. The studies were supported by detailed numerical simulations which indicated the possibility of detection and low-resolution spectroscopy in nulling mode of extra-solar giant planets (EGPs) with atmospheric temperatures down to 700 K, provided that a proper calibration of instrumental effects is applied. Detection of circumstellar exo-zodiacal (EZ) dust clouds is possible down to 0.5 mJy, with interesting prospects for the characterization of planet-forming disks. [less ▲]

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See detailDroit de l'homme et terrorisme
Monville, Pierre ULg

Part of book (2006)

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See detailDroit de l'homme et terrorisme
Monville, Pierre ULg

Part of book (2006)

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See detailAn O(1) Integration Scheme for Three-Dimensional Surface Scattering
Geuzaine, Christophe ULg

in AFRL/AFOSR 17th Electromagnetics Workshop (2006)

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See detailStrontium ranelate for preventing and treating postmenopausal osteoporosis
O'Donnell, S.; Cranney, A.; Wells, G. A. et al

in Cochrane Database of Systematic Reviews (Online) (2006), 18(CD00), 5326

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See detailComment tisser, entre l'école et l'environnement, des liens qui contribuent à instaurer des conditions de vie et de travail paisibles dans l'établissement ?
Munten, J.; Mouvet, Bernadette ULg; Jans, Véronique et al

in Point sur la Recherche en Education (Le) (2006), 31

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