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See detailA structural, infrared, and Mossbauer spectral study of rosemaryite, NaMnFe3+Al(PO4)(3)
Hatert, Frédéric ULg; Hermann, R. P.; Fransolet, André-Mathieu ULg et al

in European Journal of Mineralogy (2006), 18(6, NOV-DEC), 775-785

Rosemaryite, ideally NaMnFe(3+)AI(PO4)(3), has been collected in the Buranga pegmatite, Rwanda. A single-crystal structure refinement was performed to R-1 = 4.01 %, in the P2(1)/n space group, with a = 12 ... [more ▼]

Rosemaryite, ideally NaMnFe(3+)AI(PO4)(3), has been collected in the Buranga pegmatite, Rwanda. A single-crystal structure refinement was performed to R-1 = 4.01 %, in the P2(1)/n space group, with a = 12.001(2), b = 12.396(1), c = 6.329(1) angstrom, beta 114.48(1)degrees, Vol. = 856.9(2) angstrom(3), Z = 4. The crystal structure and cation distributions are similar to those of ferrorosemaryite, NaFe2+Fe3+Al(PO4)(3), and qingheiite, Na2MnMgAl(PO4)(3), but aluminium predominantly occurs in the M(2a) site, not in the M(2b) site as observed in ferrowyllieite, Na2Fe22+Al(PO4)(3). The topologies of the X(1a) and X(1b) crystallographic sites are identical to those found in ferrorosemaryite, and correspond to a distorted octahedron and to a distorted cube, respectively. The [7+1]-coordinated X(2) site is a very distorted gable disphenoid, similar to the A(2)' site of the alluaudite structure. Mossbauer spectra have been obtained from 4.2 to 295 K, and fitted with a model including two Fe3+ and two Fe2+ doublets. The Fe2+ component corresponding to 2/3 of the Fe2+ spectral area and having a smaller quadrupole splitting of 2.63 mm/s at 15 K, is assigned to the Fe2+ on the M(2a) site, and the Fe2+ component with the larger quadrupole splitting of 3.17 mm/s at 15 K, is assigned to the Fe2+ on the M(1) site. Fe3+ is located only at the M(2a) and M(2b) sites, and the Fe3+ component corresponding to 3/4 of the Fe3+ and exhibiting the larger quadrupole spitting of 0.77 mm/s at 15 K, is most likely associated with Fe3+ on the M(2b) site. The infrared spectrum of rosemaryite shows absorption bands at 3450 and 1624 cm(-1), bands that arise from the vibrational modes of H2O and confirm the presence of water in the channels of the wyllieite structure. A comparison of both the Mossbauer spectra and structural data of rosemaryite with those of other phosphates of the alluaudite and wyllieite groups, is also presented. [less ▲]

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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 detailDes momies à l’hôpital
Laboury, Dimitri ULg

in Warmenbol, Eugène (Ed.) La Caravane du Caire. L’Égypte sur d’autres rives (2006)

Résultats de l'analyse par rayons-X et CT-scan des momies égyptiennes (humaines et animale) conservées dans les collections des Musées de la Ville de Liège

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See detailHet recht op aftrek ratione temporis bis
Peeters, Bart ULg

in Tijdschrift voor Fiscaal Recht (2006)

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See detailQuantitative analysis of atmosphere by laser—induced breakdown spectroscopy
Yu, Liangying; Lu, Jidong; Chen, Wen et al

in Journal of Applied Optics (2006), 27(2), 147-151

In order to investigate the feasibility of quantitative analysis with laser—induced breakdown spectroscopy, plasmas were produced by a Q—switched Nd :YAG laser interacted with the air at atmospheric ... [more ▼]

In order to investigate the feasibility of quantitative analysis with laser—induced breakdown spectroscopy, plasmas were produced by a Q—switched Nd :YAG laser interacted with the air at atmospheric pressure,then the light of plasmas entered the monochrom eter and transferred into an electric signal,and the spectra of these plasmas in the range of 600~ 800 nm were stored and analyzed by the calibration—free mode1.Under the condition of delay time of 8 s and gating pulse of 0.4 s,the temperature of plasmas,which was in local thermal equilibrium (LTE),was 1.62× 10 K which was obtained by means of the two—dimensional Boltzmann plane.The 20.75 oxygen content and 79.25%nitrogen content in air were detected on the assum ption that there were only oxygen and nitrogen constituents in the air.The results coincide well with the fact.The feasibility was validated by the experiment,and it built a strong basis for the further study and experiment of air pollutant monitoring. [less ▲]

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See detailL’enseignement du français langue seconde au Burkina Faso. Pour une contextualisation didactique
Andre, Géraldine ULg

in Langage et l'Homme (Le) : Recherches Pluridisciplinaires sur le Langage (2006), 40(1), 147-161

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See detailOn the application and interpretation of Keeling plots in paleo climate research - Deciphering δ 13C of atmospheric CO 2 measured in ice cores
Köhler, Peter; Fischer, Hubertus; Schmitt, Jochen et al

in Biogeosciences (2006), 3(4), 539-556

The Keeling plot analysis is an interpretation method widely used in terrestrial carbon cycle research to quantify exchange processes of carbon between terrestrial reservoirs and the atmosphere. Here, we ... [more ▼]

The Keeling plot analysis is an interpretation method widely used in terrestrial carbon cycle research to quantify exchange processes of carbon between terrestrial reservoirs and the atmosphere. Here, we analyse measured data sets and artificial time series of the partial pressure of atmospheric carbon dioxide (pCO(2)) and of delta C-13 of CO2 over industrial and glacial/interglacial time scales and investigate to what extent the Keeling plot methodology can be applied to longer time scales. The artificial time series are simulation results of the global carbon cycle box model BICYCLE. The signals recorded in ice cores caused by abrupt terrestrial carbon uptake or release loose information due to air mixing in the firn before bubble enclosure and limited sampling frequency. Carbon uptake by the ocean cannot longer be neglected for less abrupt changes as occurring during glacial cycles. We introduce an equation for the calculation of long-term changes in the isotopic signature of atmospheric CO2 caused by an injection of terrestrial carbon to the atmosphere, in which the ocean is introduced as third reservoir. This is a paleo extension of the two reservoir mass balance equations of the Keeling plot approach. It gives an explanation for the bias between the isotopic signature of the terrestrial release and the signature deduced with the Keeling plot approach for long-term processes, in which the oceanic reservoir cannot be neglected. These deduced isotopic signatures are similar (-8.6 parts per thousand) for steady state analyses of long-term changes in the terrestrial and marine biosphere which both perturb the atmospheric carbon reservoir. They are more positive than the delta C-13 signals of the sources, e.g. the terrestrial carbon pools themselves (similar to -25 parts per thousand). A distinction of specific processes acting on the global carbon cycle from the Keeling plot approach is not straightforward. In general, processes related to biogenic fixation or release of carbon have lower y-intercepts in the Keeling plot than changes in physical processes, however in many case they are indistinguishable (e.g. ocean circulation from biogenic carbon fixation). [less ▲]

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See detailEen kritisch laboratorium. Literatuurgeschiedenis in Franstalig België
Denis, Benoît ULg

in Nieuw Zuid (2006), (21), 108-122

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See detailQuantum reversibility and echoes in interacting systems
Petitjean, Cyril ULg; Jacquod, Ph

in PHYSICAL REVIEW LETTERS (2006), 97(12), 124103-4

In echo experiments, imperfect time-reversal operations are performed on a subset of the total number of degrees of freedom. To capture the physics of these experiments, we introduce a partial fidelity M ... [more ▼]

In echo experiments, imperfect time-reversal operations are performed on a subset of the total number of degrees of freedom. To capture the physics of these experiments, we introduce a partial fidelity M(B)(t), the Boltzmann echo, where only part of the system's degrees of freedom can be time reversed. We present a semiclassical calculation of M(B)(t). We show that, as the time-reversal operation is performed more and more accurately, the decay rate of M(B)(t) saturates at a value given by the decoherence rate of the controlled degrees of freedom due to their coupling to uncontrolled ones. We connect these results with NMR spin echo experiments. [less ▲]

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See detailAntiviral efficacy and resistance in patients on antiretroviral therapy in Kigali, Rwanda: the real-life situation in 2002.
Fischer, A; Karasi, Jean Claude ULg; Kibibi, D et al

in HIV Medicine (2006), 7(1), 64-6

Our study aimed to complete the published data on ARV therapy in Africa by describing the baseline situation in Rwanda before the launch of a large ARV programme (ESTHER). Prescription habits, frequency ... [more ▼]

Our study aimed to complete the published data on ARV therapy in Africa by describing the baseline situation in Rwanda before the launch of a large ARV programme (ESTHER). Prescription habits, frequency and reasons for treatment interruptions but also antiviral efficay, resistance to ARVs and genotypic variability of the viruses present in Rwanda were analysed. Among the 233 patients included in the study, it appeared that a vast majority (91%) were under triple therapy and that half of them had experienced at least one treatment interruption caused mainly by drug shortage or financial difficulties. Among 60 blood samples analysed, 26 were in virological failure with a viral load above 1000 RNA copies/ml and 11 presented major drug resistance mutations. Finally, virological failure could mainly be explained by the high frequency of treatment interruptions but also by the emergence of drug resistance mutations. Consequently the major objective for the ESTHER programme to improve the situation in Rwanda will be to reduce the drug shortage and facilitate the financial accessibility of the treatments. [less ▲]

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See detailQue les CRACS se lèvent
Brahy, Rachel ULg; Guillaume, Jean-François ULg

Article for general public (2006)

Entrer dans l'exercice d'une citoyenneté responsable, active, critique et solidaire, suppose un long et patient travail de déconstruction des représentations initiales de l'action politique, et de ... [more ▼]

Entrer dans l'exercice d'une citoyenneté responsable, active, critique et solidaire, suppose un long et patient travail de déconstruction des représentations initiales de l'action politique, et de reconstruction de connaissances fondamentales. Il s'agit pour les jeunes belges d'appréhender le fonctionnement d'un Etat, de ses entités, de la procédure électorale,... et d'oser entreprendre une action "politique" à l'échelle locale. [less ▲]

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See detailQuand l'incontinentia pigmenti défie un dogme.
Willemaers, Valentine; Lizin, V. A.; Quatresooz, Pascale ULg et al

in Dermatologie Actualité (2006), 95

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See detailTools to assess iodine deficiency in calves born from deficient and non deficient dams
Guyot, Hugues ULg; Uyttenhoef, Aude; Lebreton, Pascal et al

Poster (2006)

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See detailStorms späte Novelle „John Riew‘“ oder: Wie alles gut wurde.
Gerrekens, Louis ULg; Pastor, Eckart ULg

in Schriften der Theodor-Storm-Gesellschaft (2006), 55

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See detailDie Keure van Zeeland
Adam, Renaud ULg

in Bousmanne, Bernard; Thieffry, Sandrine; Wijsman, Hanno (Eds.) Filips de Schone (1478-1506) : schatten van de laatste hertog van Bourgondië : [tentoonstelling : Brussel, Koninklijke Bibliotheek van België, Nassaukapel, van 3 november 2006 tot 27 januari 2007] : catalogus (2006)

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See detail"Prose" - direction du "Dossier américain" (116 pages)
Delville, Michel ULg

in Formes Poétiques Contemporaines (2006), 4

Direction du dossier "dossier américain" du vol. 4 de la revue FPC (2006): pp. 213-328

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