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See detailOpal-CT precipitation in a clayey soil explained by geochemical transport model of dissolved Si (Blégny, Belgium)
Ronchi, Benedicta; Barao, A.L.; Vandevenne, F. et al

Poster (2013, August 25)

Opal-CT precipitation controlling dissolved Si export Dissolved Si (DSi) exported by rivers are controlled by geological, hydrological and biological cycle processes [1]. The DSi concentrations measured ... [more ▼]

Opal-CT precipitation controlling dissolved Si export Dissolved Si (DSi) exported by rivers are controlled by geological, hydrological and biological cycle processes [1]. The DSi concentrations measured in a river of an upstream catchment in eastern Belgium (Blégny, Land of Herve) don’t vary seasonally (6.91±0.94mgL-1; n=363). Si concentrations in pore water are often higher and vary more (8.65±3.65mgL-1; n=128). The decrease of DSi along the flowpath of water is due to sink processes, i.e. precipitation, adsorption or uptake by vegetation. As the DSi in the river does not show any seasonal variation, uptake by vegetation can be ruled out [1] whereas precipitation or adsorption can control the DSi drained by the stream water. This hypothesis is confirmed by XRD and DeMaster analysis. At 0.1m depth the soil is constituted of 62% quartz, 7% K-feldspar, 6% plagioclase, 3.2% carbonates, 18.9% Al-clay, 1.47% Kaolinite, 0.63% Chlorite and 0.2% amorphous Si, probably of biogenic origin. At 1.5m depth, the amounts of several minerals (35.8% quartz, 0.6% K-feldspars, 0.9% plagioclase, Al-clay 14.7%) drop drastically. Carbonates, chlorite and kaolinite are absent whereas 40.4% opal-CT appears. The precipitation of opal-CT controls the DSi export of this catchment. Development of geochemical transport model To descripe DSi export from a catchment a geochemical transport model is developped in HP1 which couples the water flux model Hydrus with the geochemical model PHREEQC [2]. Our model is based on the conceptual model developped in [3]. First results show different DSi export dynamics in the unsaturated zone than in the aquifer due to different pCO2 values and varying soil moisture conditions. Further development of the model will help to find out the reason of opal-CT precipitation in this setting. [1]Fulweiler, Nixon (2005) Biogeochemistry 74:115–130. [2] Simunek, Jacques, van Genuchten, Mallants (2006) JAWRA 42:1537-1547. [3] Ronchi et al. (2013). Silicon, 5(1), 115–133. [less ▲]

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See detailOpegrapha viridistellata (Roccellaceae), a new foliicolous lichen species from the Paleotropics
Sérusiaux, Emmanuël ULg; Lücking, Robert; Sparrius, Laurens

in Mycotaxon (2008), 104

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See detailOpen flux in Saturn's magnetosphere
Badman, Sarah; Jackman, Caitriuna; Nichols, Jonathan et al

in Icarus (2014), 231

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See detailOpen Access : Ta thèse pour tous ?
Thirion, Paul ULg

Diverse speeche and writing (2008)

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See detailOpen Access : Quand l'utopie devient réalité quotidienne. La situation dans les Universités belges francophones
Thirion, Paul ULg

Conference given outside the academic context (2008)

Open Access initiatives in Belgium french speaking universities

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See detailL'Open Access en Belgique francophone : étude de la BICfB réalisée à la demande des Recteurs des universités et du F.R.S.-FNRS
Renaville, François ULg; Bastin, Myriam ULg; Audrit, Stéphanie ULg et al

Report (2012)

Au printemps 2011, les Recteurs des universités de la Fédération Wallonie-Bruxelles et le Fonds de la Recherche Scientifique – FNRS (F.R.S.-FNRS) ont émis le souhait de voir mener une étude sur le ... [more ▼]

Au printemps 2011, les Recteurs des universités de la Fédération Wallonie-Bruxelles et le Fonds de la Recherche Scientifique – FNRS (F.R.S.-FNRS) ont émis le souhait de voir mener une étude sur le développement de l’Open Access en Belgique francophone. Ils ont décidé de confier la réalisation de celle-ci à la Bibliothèque Interuniversitaire de la Communauté française de Belgique (BICfB). La présente étude fait le point sur le développement des dépôts institutionnels (Voie Verte) des universités de la Fédération Wallonie-Bruxelles et apporte un éclairage sur l'implication active des enseignants et chercheurs de leurs institutions (en tant qu’éditeur en chef, membre du comité de rédaction, peer-reviewer, etc.) dans la vie de revues scientifiques en Open Access (Voie d’Or) ou tout au moins accessibles gratuitement sur le web. [less ▲]

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See detailOpen and distance education in the french community of Belgium and some comparisons with France
Denis, Brigitte ULg; Detroz, Pascal ULg

in Bartolome, A.; Underwood, J. (Eds.) TEEODE : Technology enhanced evaluation in open and distance learning (1998)

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See detailOpen Flux Estimates and Reconnection Rates in Saturn's Magnetosphere, Derived Using HST and Cassini Data
Badman, S. V.; Bunce, E. J.; Clarke, J. T. et al

Conference (2005, December 01)

During January 2004, a sequence of 68 UV images of Saturn's southern aurora was obtained by the Hubble Space Telescope (HST), coordinated with measurements of the upstream interplanetary conditions made ... [more ▼]

During January 2004, a sequence of 68 UV images of Saturn's southern aurora was obtained by the Hubble Space Telescope (HST), coordinated with measurements of the upstream interplanetary conditions made by the Cassini spacecraft. Using the poleward edge of the observed aurora as a proxy for the open-closed field line boundary, the open flux content of the southern polar region has been estimated. It is found to range from 15 to 50 GWb during the interval, such a large variation providing evidence of a significant magnetospheric interaction with the solar wind, in particular with structures associated with corotating interaction regions (CIRs). Cassini measurements of the upstream interplanetary conditions have been used to estimate the rate of open flux production at the magnetopause. By comparison with the open flux values obtained from the images, the rate of open flux closure in Saturn's magnetotail is also estimated. We find that the rate of open flux production is high (200 kV) in the high-field strength intervals following the onset of CIR-related compressions, and elevated (30-40 kV) in an intermediate-field strength rarefaction region. High flux closure rates (100-200 kV) are estimated in association with the onset of solar wind compressions and are intermittently increased (30-60 kV) during a weak-field rarefaction region. The disturbed auroral forms seen in the images are discussed in relation to the estimated reconnection rates. Recent studies have suggested that Saturn Kilometric Radiation emissions are also disturbed by the onset of CIR compressions at Saturn. [less ▲]

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See detailOpen flux estimates in Saturn's magnetosphere during the January 2004 Cassini-HST campaign, and implications for reconnection rates
Badman, S. V.; Bunce, E. J.; Clarke, J. T. et al

in Journal of Geophysical Research. Space Physics (2005), 110(A11),

During 8-30 January 2004, a sequence of 68 UV images of Saturn's southern aurora was obtained by the Hubble Space Telescope (HST), coordinated for the first time with measurements of the upstream ... [more ▼]

During 8-30 January 2004, a sequence of 68 UV images of Saturn's southern aurora was obtained by the Hubble Space Telescope (HST), coordinated for the first time with measurements of the upstream interplanetary conditions made by the Cassini spacecraft. Using the poleward edge of the observed aurora as a proxy for the open-closed field line boundary, the open flux content of the southern polar region has been estimated. It is found to range from similar to 15 to similar to 50 GWb during the interval, such a large variation providing evidence of a significant magnetospheric interaction with the solar wind, in particular with the interplanetary structures associated with corotating interaction regions (CIRs). The open flux is found to decline slowly during a rarefaction region in which the interplanetary magnetic field remained very weak, while decreasing sharply in association with the onset of CIR-related solar wind compressions. Such decreases are indicative of the dominating role of open flux closure in Saturn's tail during these intervals. Increases in open flux are found to occur in the higher-field compression regions after the onsets, and in a following rarefaction region of intermediate field strength. These increases are indicative of the dominating role of open flux production at Saturn's magnetopause during these intervals. The rate of open flux production has been estimated from the upstream interplanetary data using an empirical formula based on experience at Earth, with typical values varying from similar to 10 kV during the weak-field rarefaction region, to similar to 200 kV during the strong-field compression. These values have been integrated over time between individual HST image sets to estimate the total open flux produced during these intervals. Comparison with the changes in open flux obtained from the auroral images then allows us to estimate the amount of open flux closed during these intervals, and hence the averaged tail reconnection rates. Intermittent intervals of tail reconnection at rates of similar to 30-60 kV are inferred in rarefaction regions, while compression regions are characterised by rates of similar to 100-200 kV, these values representing averages over the similar to 2-day intervals between HST image sequences. [less ▲]

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See detailOpen flux estimates in Saturn's magnetosphere during the January 2004 Cassini-HST campaign, and implications for reconnection rates
Badman, S. V.; Bunce, E. J.; Clarke, J. T. et al

Conference (2005, August 07)

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See detailOpen Linking et OpenURL
Mottet, Philippe ULg

in Cahiers de la Documentation = Bladen voor Documentatie (2005), 59(2), 35-47

Les notions d’Open Linking, d’OpenURL, de sensibilité au contexte ou de copie appropriée sont largement répandues désormais dans le monde de l’information scientifique, même si on ne sait pas toujours ... [more ▼]

Les notions d’Open Linking, d’OpenURL, de sensibilité au contexte ou de copie appropriée sont largement répandues désormais dans le monde de l’information scientifique, même si on ne sait pas toujours précisément ce qui se cache sous cette terminologie un peu mystérieuse. Un système d’Open Linking permet, sur Internet et dans un cadre documentaire, de relier entre elles toutes les informations relatives à un sujet particulier grâce à des adresses URL/URI qui portent le nom d’OpenURL. Ces liens OpenURL sont créés dynamiquement à la suite de re-cherches bibliographiques et permettent de rebondir vers d’autres ressources électroniques proposant des in-formations complémentaires liées à la référence de départ et dont l’accès est autorisé pour l’utilisateur. La norme ANSI/NISO Z39.88 définit la syntaxe des liens OpenURL ainsi que les métadonnées, identifiants et protocoles d’échange de communication qui peuvent y être incorporés. [less ▲]

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See detailOpen magnetic flux and magnetic flux closure during sawtooth events
Hubert, Benoît ULg; Milan, S. E.; Grocott, A. et al

in Geophysical Research Letters (2008), 35

We use IMAGE-FUV observations of the polar aurora and measurements of the ionospheric convection from the SuperDARN radar network to study several sawtooth events previously reported in the literature. We ... [more ▼]

We use IMAGE-FUV observations of the polar aurora and measurements of the ionospheric convection from the SuperDARN radar network to study several sawtooth events previously reported in the literature. We estimate the amount of open magnetic flux in the Earth magnetosphere during a significant part of these sawtooth intervals as well as the magnetic flux opening and closure rates, that is, the dayside and nightside reconnection rates. We find that during the sawtooth intervals the magnetosphere is highly loaded with open flux as a result of the strongly southward IMF carried by the solar wind during these intervals. The magnetosphere tries to relax to a less loaded configuration through a sequence of substorm expansions. However, these substorms do not necessarily evolve to their end before reintensification of nightside reconnection occurs in response to continued loading of the magnetosphere on the dayside. [less ▲]

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See detailOpen MR-guided high-dose-rate (HDR) prostate brachytherapy: feasibility and initial experiences
LAKOSI, Ferenc ULg; Gergely Antal; Csaba Vandulek et al

in Pathology Oncology Research (2011), 17(2), 315-24

The aim of our pilot study was to demonstrate the feasibility and dosimetric quality of MR-guided HDR prostate brachytherapy in a low-field 0.35T open MRI scanner and to present our initial clinical ... [more ▼]

The aim of our pilot study was to demonstrate the feasibility and dosimetric quality of MR-guided HDR prostate brachytherapy in a low-field 0.35T open MRI scanner and to present our initial clinical experiences. 16 patients with intermediate- to high-risk localized prostate cancer were treated with 46-60 Gy of external beam radiotherapy preceded and/or followed by an 8 Gy MR-guided HDR boost. For interventions an MR compatible custom-made system, coaxial needles and plastic catheters were used. Template reconstruction, trajectory planning, image guidance, contouring and treatment planning were exclusively based on MR images. For treatment planning, dose-point- and anatomy-based inverse planning optimization was used. Image quality was found to be good to excellent in almost all cases. The mean catheter placement accuracy modeled by Rayleigh distribution was 2.9 mm with a sigma value of 2.3 mm. The mean and standard deviation (SD) of the dosimetric results for the target volume were the following: V100: 94.2 ± 4.3%, V150: 43.9 ± 6.8%, V200: 18.5 ± 5.9%. The mean D(0.1), D(1) and D1 values for the intraprostatic urethra were 117.6 ± 12.5%, 98.5 ± 19.9% and 122.3 ± 16.4%, respectively. Regarding the rectal wall the mean D(0.1), D(1) and D(2) values were 77.3 ± 7.2%, 64.8 ± 7.5%, and 53.2 ± 9.1%, respectively. The mean maximum dose for the inner rectal surface was 53.5 ± 9.2%. No RTOG Grade 3 or worse acute toxicities were observed. Our method seems to be a promising approach for performing feasible, accurate and high-quality MR-guided HDR prostate brachytherapy. To determine the long term side effects and outcome higher number of patients, additional follow-up is needed. [less ▲]

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See detailOpen pilot trial of ritanserin in parkinsonism.
MAERTENS DE NOORDHOUT, Alain ULg; Delwaide, Paul ULg

in Clinical Neuropharmacology (1986), 9(5), 480-4

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See detailAn Open Problem of MCDA: Aid to the Conception of the Building Envelope
Colson, Gérard ULg; Hauglustaine, Jean-Marie ULg

Conference (1999, March)

In the conception of the envelope of a building, the sketch design is a crucial moment of the design. The first drawing gives a concrete expression to the first choices of the project author, in respect ... [more ▼]

In the conception of the envelope of a building, the sketch design is a crucial moment of the design. The first drawing gives a concrete expression to the first choices of the project author, in respect of a set of requirements and of general preferences, expressed by the multiple stakeholders of the project, namely: the building owner, the users, the administrative authorities and the design team surrounding the architect. In order to help the stakeholders in improving this stage of the sketch design, the present study explores a multicriteria decision aiding procedure. This MultiCriteria Decision Aid (MCDA) methodology should be close to the usual design process. This paper presents the design aid procedures, in parallel. At this time of the study, the decision aid process is a first attempt to cope with this architectural design challenge. The floor is expected to react to the suggested presentation of this MCDA open problem. [less ▲]

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See detailAn open software environment for testing electromagnetic analysis methods
Dular, Patrick ULg; Henrotte, F.; Geuzaine, Christophe ULg et al

in Proceedings of the Sixth International TEAM Workshop (1997)

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See detailAn open source traffic engineering toolbox
Leduc, Guy ULg; Abrahamsson, Henrik; Balon, Simon ULg et al

in Computer Communications (2006), 29(5), 593-610

We present the TOTEM open source Traffic Engineering (TE) toolbox and a set of TE methods that we have designed and/or integrated. These methods cover intra-domain and inter-domain TE, IP-based and MPLS ... [more ▼]

We present the TOTEM open source Traffic Engineering (TE) toolbox and a set of TE methods that we have designed and/or integrated. These methods cover intra-domain and inter-domain TE, IP-based and MPLS-based TE. They are suitable for network optimisation, better routing of traffic for providing QoS, load balancing, protection and restoration in case of failure, etc. The toolbox is designed to be deployed as an on-line tool in an operational network, or used off-line as an optimisation tool or as a traffic engineering simulator. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailAn open study to investigate the absorption and tolerability of oral 311C90 and to obtain a preliminary indication of efficacy in migraine patients
Schoenen, Jean ULg; Caekebeke, J.; Louis, P. et al

in Clifford Rose, F. (Ed.) New Advances in Headache Research (1994)

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See detailOpen surgery for abdominal aortic aneurysm or aorto-iliac occlusive disease--clinical and ultrasonographic long-term results.
Fontaine, Robert ULg; Kolh, Philippe ULg; Creemers, Etienne ULg et al

in Acta Chirurgica Belgica (2008), 108(4), 393-9

OBJECTIVE: To determine postoperative and long-term outcome and assess the relevance of abdominal ultrasound (US) after surgery for abdominal aortic aneurysm (AAA) or aortoiliac occlusive disease (AIOD ... [more ▼]

OBJECTIVE: To determine postoperative and long-term outcome and assess the relevance of abdominal ultrasound (US) after surgery for abdominal aortic aneurysm (AAA) or aortoiliac occlusive disease (AIOD). METHODS: Records of 1704 consecutive patients having graft implantation from 1988 to 2000, either for AAA (n = 1144) or for AIOD (n = 560), were reviewed. In 2006, follow-up was 9180 patients-years for the AAA group and 5450 patients-years for the AIOD group. Among 1006 alive patients, 377 were invited randomly for US and clinical examination. RESULTS: Hospital death occurred in 99 patients (8.6%) of the AAA group (53% in ruptured and 2% in elective AAA), and in 18 patients of the AIOD group (3.2%). There were 581 late deaths, including eight due to prosthesis infection, one to pseudo-aneurysm rupture, and one to graft thrombosis (0.6% graft-related mortality). Prosthesis thrombosis occurred in 32 patients (26 in AIOD group, p < 0.001), and graft infection in 26 (17 in AAA group, p < 0.01). Pseudoaneurysms developed in 90 patients (68 in AIOD group, p < 0.001), including eight at the proximal aortic, one at the distal aortic, two at the iliac and 79 at the femoral anastomosis. In the AAA group only, surgery was required for a new thoraco-abdominal and pararenal aneurysm in eight and four patients, respectively, while US evidenced a 26-35 and a 36-50 mm supraanastomotic aortic dilatation in 65 (32%) and in 14 (7%) patients, at a mean follow-up of 10.5 and 9.3 years, respectively. CONCLUSION: Long-term results are good after open surgery for AAA or AIOD. Prosthesis infection and anastomotic pseudo-aneurysm are the main causes of graft-related mortality and morbidity, respectively. Because of high incidence of asymptomatic supraanastomotic aortic dilatation, all patients with a history of AAA repair should have regular abdominal US. [less ▲]

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