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See detailSynthesis optimization of organic xerogels produced from convective air-drying of resorcinol-formaldehyde gels
Job, Nathalie ULg; Panariello, Fabian; Marien, José ULg et al

in Journal of Non-Crystalline Solids (2006), 352(1), 24-34

Resorcinol-formaldehyde gels were produced at 50, 70 and 90 degrees C and with three different R/C ratios (500, 1000 and 2000). The effect of these variables combined with that of aging time was studied ... [more ▼]

Resorcinol-formaldehyde gels were produced at 50, 70 and 90 degrees C and with three different R/C ratios (500, 1000 and 2000). The effect of these variables combined with that of aging time was studied in order to optimize the synthesis conditions. The convective air-drying process was used, and the drying duration was studied with regard to the synthesis conditions. The aging time has no effect on the pore texture after 24 h at 90 degrees C or 48 h at 70 C, whatever the R/C value. The synthesis-aging step can be shortened by increasing the temperature. Nevertheless, the pore size tends then to decrease, especially when R/C is high, but this can be counterbalanced by increasing R/C. Moreover, bubbles often appear in the gel at high synthesis temperature, which limits the temperature to about 70 degrees C in the case of monolithic parts. At 70 degrees C and with an air velocity of 2 m/s, the elimination of 90% of the solvent requires 1 h drying when the pore size reaches 400-600 nm, 2.5 h for 50 nm wide pores and 3 h when the pore size decreases to 15-20 nm. The drying duration does not exceed 8 h in all cases and could be shortened by increasing the temperature at the end of the process. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailThe Peculiar Of?p Stars HD 108 and HD 191612: The X-ray View
Nazé, Yaël ULg; Rauw, Grégor ULg; Walborn, N. R. et al

in The X-ray Universe 2005 (2006, January 01)

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See detailL'astronomie dans le monde
Manfroid, Jean ULg

Article for general public (2006)

Contrails; Un télescope géant en quête de rayons cosmiques; Stardust; Titan dix mois après l'atterrissage réussi de la sonde Huygens; Geysers sur Encelade; Spirale autour de Saturne; Autre anomalie de l ... [more ▼]

Contrails; Un télescope géant en quête de rayons cosmiques; Stardust; Titan dix mois après l'atterrissage réussi de la sonde Huygens; Geysers sur Encelade; Spirale autour de Saturne; Autre anomalie de l'anneau F; Toujours l'anneau F; Une lune de plus pour 2003 EL61; Un KBO à  l'orbite exceptionnelle; Détection d'une exoplanète de la taille de Neptune; AMBER scrute l'environnement d'une étoile; Première détection du champ magnétique au coeur du disque d'accrétion d'une protoétoile; Collisions intergalactiques; Arpentage galactique [less ▲]

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See detailTransactivation of MCP-1/CCL2 by beta-catenin/TCF-4 in human breast cancer cells
Mestdagt, Mélanie ULg; Polette, M.; Buttice, G. et al

in International Journal of Cancer = Journal International du Cancer (2006), 118(1), 35-42

The loss of E-cadherin expression and the translocation of beta-catenin to the nucleus are frequently associated with the metastatic conversion of epithelial cells. In the nucleus, beta-catenin binds to ... [more ▼]

The loss of E-cadherin expression and the translocation of beta-catenin to the nucleus are frequently associated with the metastatic conversion of epithelial cells. In the nucleus, beta-catenin binds to the TCF/LEF-1 (T-cell factor/ lymphoid enhancer factor) transcription factor family resulting in the activation of several genes, some of them having important implications in tumour progression. In our study, we investigated the potential regulation of monocyte chemotactic protein-1 (MCP-1/CCL2) expression by the beta-catenin/TCF pathway. This CC-chemokine has been implicated in tumour progression events such as angiogenesis or tumour associated macrophage (TAM) infiltration. We thus demonstrated that MCP-1 expression correlates with the reorganization of the E-cadherin/beta-catenin complexes. Indeed, MCP-1 was expressed by invasive breast cancer cells (MDA-MB-231, BT549 and Hs578T), which do not express E-cadherin but was not produced by noninvasive breast cancer cell lines (MCF7 and T47D) expressing high level of E-cadherin. In addition, the MCP-1 promoter was activated in BT549 breast cancer cells transfected with beta-catenin and TCF-4 cDNAs. The MCP-1 mRNA level was similarly upregulated. Moreover, we showed that MCP-1 mRNA was downregulated after transfection with a siRNA against beta-catenin in both BT549 and Hs578T cells. Our results therefore identify MCP-1 as a target of the beta-catenin/TCF/LEF pathway in breast tumour cells, a regulation which could play a key role in breast tumour progression. (c) 2005 Wiley-Liss, Inc. [less ▲]

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See detailA line-profile analysis of the large-amplitude beta Cephei star xi1 Canis Majoris
Saesen, S.; Briquet, Maryline ULg; Aerts, C.

in Communications in Asteroseismology (2006), 147

We present a detailed line-profile study of the beta Cephei star xi1 Canis Majoris, for which we have assembled numerous high-resolution spectra over a period of 4.5 years. It is the first time that the ... [more ▼]

We present a detailed line-profile study of the beta Cephei star xi1 Canis Majoris, for which we have assembled numerous high-resolution spectra over a period of 4.5 years. It is the first time that the line-profile variations of this star have been analysed. We focused on the Si III line profiles centered on 4560 A. We searched for oscillation frequencies in different line diagnostics and find the star to be monoperiodic with frequency f=4.77153 c/d. By means of the moment method and from amplitude and phase variations across the line profiles we identified the oscillation mode of the star as radial. xi1 CMa is among the very few beta Cephei stars with a radial-velocity amplitude larger than the local speed of sound and profile variations that clearly deviate from those predicted by linear oscillation theory. [less ▲]

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See detailAn asteroseismic study of the beta Cephei star beta Canis Majoris
Desmet, M.; Briquet, Maryline ULg; Mazumdar, A. et al

in Communications in Asteroseismology (2006), 147

We present a spectroscopic study of the beta Cephei star beta Canis Majoris. Hundreds of high-resolution spectra were gathered during 4.5 years and the Si III line profiles centered on 4560 A were ... [more ▼]

We present a spectroscopic study of the beta Cephei star beta Canis Majoris. Hundreds of high-resolution spectra were gathered during 4.5 years and the Si III line profiles centered on 4560 A were subjected to a detailed line profile analysis. We searched for oscillation frequencies in different line diagnostics, compared them with those known from photometric studies and concluded the presence of three frequencies in our dataset: f_1 = 3.97933 c/d, f_2 = 3.99959 c/d and f_3= 4.1832 c/d, which were already found earlier from photometric data. By means of the moment method and from amplitude and phase variations across the profiles we could identify two of the modes as (l_1,m_1)=(2,2) and (l_2,m_2)=(0,0$. We present our first results of modelling based on the oscillation frequencies and place constraints on the mass, age and core overshooting of this massive evolved beta Cephei star. [less ▲]

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See detailPour une formation des imams en Belgique. Points de référence en Belgique et en Europe
Husson, Jean-François ULg; Dury, Julie ULg

Report (2006)

Within the framework of considérations regarding the training of imams in Belgium, the King Baudouin Foundation sought to produce a report portraying the situation concerning organised secularism and ... [more ▼]

Within the framework of considérations regarding the training of imams in Belgium, the King Baudouin Foundation sought to produce a report portraying the situation concerning organised secularism and religions in the country. The main aim of such a report was to outline the training of both ministers of recognised religions and secular delegates. In a second phase, a similar approach was taken to describe the situation in a few other European countries. Belgium has no legal provisions or regulations that are recognised as such by the state and impose minimum requirements on the training of religious ministers or secular delegates. Consequently, it is the internal rules laid down by the various religions themselves that define such training requirements. However, some training of this type is organised as part of recognised, subsidised higher education and therefore leads to the conferral of a legally recognised title. Similar situations apply in some other countries. The present study discusses the situation in France, the Netherlands, Great Britain, Germany and Sweden. In all these countries, it is entirely up to the respective religions themselves to stipulate their internal training requirements. However, as in Belgium, such mandatory training may be organised within the framework of higher education that is financed and/or organised by the state and, if need be, incorporated in a bachelor's or master's degree. One significant observation is that in the countries in question combinations of academic and religious requirements apply in various instances, indeed for a relatively large number of religions (at least in the Netherlands and Great Britain). The experience gained in France, the Netherlands and Great Britain also highlights how divided Muslim communities are with respect to the training requirements applying to imams. The establishment of internal standards applying solely within Islam would appear to constitute a first, essential step towards the creation of suitable training that applies to adherents of all the various 'trends' within this particular religious community. In this connection, the Executive of Belgian Muslims could play a crucial role. Furthermore, in Belgium the salaries of religious ministers and secular delegates are paid by the federal government, in line with its recognition of the religions in question, based on criteria that include their 'service to society'. The question arising next concerns the academic qualification to be awarded at the end of such training. No doubt it would make sense to impose at least the requirement equivalent to that expected by the ministers of other religions. Experience gained abroad also underscores the value of calling upon the expertise and skills already on offer at higher education institutions, teaching universities and research establishments when putting together a training course based on a progressive growth model, developing ideas for the short, medium and long term. If training for imams is offered as an option in higher or university education, as a community-related subject, Belgium's various Communities will have to be invited, as appropriate, to join in the associated thought process. Similarly, the constitutionality of making the payment of a religious minister's salary dependent on their having undergone a specific training course will need to be addressed. In this connection, we refer you to the work being done by the committee recently set up by Minister Onkelinx, which is due to publish a report some time in 2006. Finally, the social role played by imams should not be ignored. In this respect, any training project will also have to take on board considerations such as how to meet short-term needs (especially with regard to languages and knowledge of the society in question, particularly compared with serving imams) and subsequent developments (e.g. taking account of young Muslims born in the respective country, most of whom will have the corresponding nationality). [less ▲]

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See detailAu fur et à mesure qu'elles se construisent, les trajectoires professionnelles divergent entre les sexes : l'exemple belge
Gavray, Claire ULg

in Formation Emploi : Revue Française de Sciences Sociales (2006), 93

L'article montre que les trajectoires professionnelles des hommes et des femmes divergent de plus en plus le temps passant et l'âge avançant. Le partage inégal des responsabilités familiales est loin d ... [more ▼]

L'article montre que les trajectoires professionnelles des hommes et des femmes divergent de plus en plus le temps passant et l'âge avançant. Le partage inégal des responsabilités familiales est loin d'expliquer à lui seul ce phénomène. Il faut également incriminer la qualité inégale des premiers emplois et séquences professionnelles accessibles pour les deux groupes sexués en début de carrière. [less ▲]

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See detailExpression of the somatolactin beta gene during zebrafish embryonic development
Lopez, Mauricio; Nica, G.; Motte, Patrick ULg et al

in Gene Expression Patterns (2006), 6(2), 156-161

Somatolactin (Sl) is a pituitary hormone closely related to prolactin (Prl) and growth hormone that was until now only found in various fish species. We isolated the cDNA coding for zebrafish Sl beta and ... [more ▼]

Somatolactin (Sl) is a pituitary hormone closely related to prolactin (Prl) and growth hormone that was until now only found in various fish species. We isolated the cDNA coding for zebrafish Sl beta and we identified the gene encoding this hormone. We also obtained a 1 kb genomic fragment corresponding to the sl beta upstream promoter region. Furthermore, the sl beta expression pattern was examined during zebrafish embryogenesis using whole-mount in situ hybridization. Sl beta mRNA is first detected in a single cell at the anterior border of the neural plate starting at 23 h post fertilization (hpf). Sl beta-expressing cells also express the transcription factor pit1 and are located close to prl-expressing cells. Using combined fluorescent in situ hybridization, we show that sl beta- and prl-expressing cells are clearly distinct at 29 hpf. Starting at 30 hpf, the number of sl beta positive cells increases and their location becomes more clearly distinct from lactotrope cells, in a more posterior position. At later stages (48 hpf), sl beta expression was observed posterior to growth hormone expression, again in a distinct cell type. We show that zebrafish mutants aal, as well as mutants in the pit1 gene, are deficient in sl beta expression. In conclusion, sl beta expression defines a new, additional cell type in zebrafish pituitary that depends on pit1 and aal for its differentiation. (C) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailForeword - Transport protocols for next generation networks
Pham, Congduc; Leduc, Guy ULg

in Annales des Télécommunications = Annals of Telecommunications (2006), 61(1-2, JAN-FEB), 2-4

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See detailFragile Symbiose
Paques, Frédéric ULg

in 9e Art : Les Cahiers du Musée de la Bande Dessinée (2006)

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See detailBiochemical markers of bone metabolism in Ardennes horses
Pastoret, V.; Carstanjen, V.; Hoyle, N. R. et al

Poster (2006, January)

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See detailConcurrent coronary and carotid artery surgery: factors influencing perioperative outcome and long-term results
Kolh, Philippe ULg; Comté, Laetitia ULg; Tchana-Sato, Vincent ULg et al

in European Heart Journal (2006), 27(1), 49-56

Aims To assess risk factors for early and late outcome after concurrent carotid endarterectomy (CEA) and coronary artery bypass grafting (CABG). Methods and results Records of all 311 consecutive patients ... [more ▼]

Aims To assess risk factors for early and late outcome after concurrent carotid endarterectomy (CEA) and coronary artery bypass grafting (CABG). Methods and results Records of all 311 consecutive patients having concurrent CEA and CABG from 1989 to 2002 were reviewed, and follow-up obtained (100% complete). In the group (mean age 67 years; 74% males), 62% had triple-vessel disease, 57% unstable angina, 31% left main coronary stenosis, 19% congestive heart failure, and 35% either a history of vascular procedures or existing vasculopathies. Preoperative assessment revealed transient ischaemic attack in 16%, stroke in 7%, and bilateral carotid disease in 20%. There were 7% emergent and 19% urgent operations, and ascending aorta was described as atheromatous or calcified in 21%. Hospital death occurred in 19 patients, myocardial infarction in seven, and permanent stroke in 12. Significant multivariable predictors of hospital death were aortic calcifications, coexisting vasculopathy, and emergent procedure. Significant predictors of postoperative stroke were calcified or dilated aorta, and of prolonged hospital stay were advanced age, unstable angina, and coexisting vascular disease. For hospital survivors, 10-year actuarial late event-free rates were: death, 50%; myocardial infarction, 84%; stroke, 93%; percutaneous angioplasty, 95%; redo CABG, 98%; and all morbidity and mortality, 48%. Significant multivariable predictors of late deaths were coexisting vasculopathy, age, renal insufficiency, previous cardiac surgery, tobacco abuse, calcified or atheromatous aorta, and duration of intensive care unit stay. Conclusion Concurrent CEA and CABG can be performed with acceptable operative mortality and morbidity, and good long-term freedom from coronary and neurologic events. Atheromatous aortic disease is a harbinger of poor operative and long-term outcome. [less ▲]

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See detailLa liberté de la presse a du plomb dans l’aile
Durand, Pascal ULg

Article for general public (2006)

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See detailDesign of movables Weirs and Storm Surge Barriers
Rigo, Philippe ULg; Abdelnour, R.; Bulckaen, D. et al

Book published by PIANC - INCOM (2006)

State of of in the dsign of movable weirs and storm surge barriers

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See detailVers une harmonisation européenne de la communication et du contrôle de la qualité écologique et sociale (QES) : l'intérêt de l'intégration d'un curseur QES dans les outils de contrôle de gestion de l'entreprise
Fraselle, Nadine; Van Caillie, Didier ULg

in Working Paper 2006/01 - CEPE (2006, January)

This paper investigates why and how it is interesting to consider the integration of an Ecological and Social Indicator in the different management control tools. It proposes a methodology to do so that ... [more ▼]

This paper investigates why and how it is interesting to consider the integration of an Ecological and Social Indicator in the different management control tools. It proposes a methodology to do so that could be translated into most industries. [less ▲]

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See detailIntermediate integer programming representations using value disjunctions
Louveaux, Quentin ULg

Conference (2006, January)

We introduce a general technique for creating an extended formulation of a mixed-integer program. We classify the integer variables into blocks, each of which generates a finite set of vector values. The ... [more ▼]

We introduce a general technique for creating an extended formulation of a mixed-integer program. We classify the integer variables into blocks, each of which generates a finite set of vector values. The extended formulation is constructed by creating a new binary variable for each generated value. Initial experiments show that the extended formulation can have a more compact complete description than the original formulation. We prove that, using this reformulation technique, the facet description decomposes into one “linking polyhedron” per block and the “aggregated polyhedron”. Each of these polyhedra can be analyzed separately. For the case of identical coefficients in a block, we provide a complete description of the linking polyhedron and a polynomial-time separation algorithm. Applied to the knapsack with a fixed number of distinct coefficients, this theorem provides a complete description in an extended space with a polynomial number of variables. On the basis of this theory, we propose a new branching scheme that analyzes the problem structure. It is designed to be applied in those subproblems of hard integer programs where LP-based techniques do not provide good branching decisions. Preliminary computational experiments show that it is successful for some benchmark problems of multi-knapsack type. [less ▲]

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See detailA unified extended thermodynamic description of diffusion, thermo-diffusion, suspensions, and porous media
Lebon, Georgy ULg; Desaive, Thomas ULg; Dauby, Pierre ULg

in Journal of Applied Mechanics-Transactions of the Asme (2006), 73(1), 16-20

It is shown that extended irreversible thermodynamics (EIT) provides a Unified description of a great variety of processes, including matter diffusion, thermo-diffusion, suspensions, and fluid flows in ... [more ▼]

It is shown that extended irreversible thermodynamics (EIT) provides a Unified description of a great variety of processes, including matter diffusion, thermo-diffusion, suspensions, and fluid flows in porous media. This is achieved by enlarging the set of classical variables, as mass, momentum and temperature by the corresponding fluxes of mass, momentum and heat. For simplicity, we consider only Newtonian fluids and restrict ourselves to a linear analysis: quadratic and higher order terms in the fluxes are neglected. In the case of diffusion in a binary mixture, the extra flux variable is the diffusion flux of one the constituents, say the solute. In thermo-diffusion, one adds the heat flux to the set of variables. The main result of the present approach is that the traditional equations of Fick, Fourier Soret, and Dufour are replaced by time-evolution equations for the matter and heat fluxes, such generalizations are useful in high-frequency processes. It is also shown that the analysis can be easily extended to the study of particle suspensions in fluids and to flows in porous media, when such systems can be viewed as binary mixtures with a solid and a fluid component. [less ▲]

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See detailLe cas clinique du mois. Necrose du cuir chevelu revelatrice d'une arterite a cellules geantes (maladie de Horton)
Smitz, S. S.; HEINEN, Vincent ULg; Van Damme, Hendrik ULg

in Revue Médicale de Liège (2006), 61(1), 5-7

Scalp necrosis is an uncommon manifestation of giant cell arteritis (GCA). In this paper, we report our experience with a 78-year old woman in whom extensive scalp necrosis developed as a complication of ... [more ▼]

Scalp necrosis is an uncommon manifestation of giant cell arteritis (GCA). In this paper, we report our experience with a 78-year old woman in whom extensive scalp necrosis developed as a complication of GCA. A left frontal defect (7 X 4 cm) involving full-thickness scalp was observed. The necrosis extended deeply, involving the epicranium and the outer table of the skull. The therapeutic approach included corticotherapy, anticoagulation and wound care. Severe wound infection (osteitis, subgaleal abscess) occurred, requiring prolonged antibiotherapy. Second intention healing was obtained using a conservative approach. During the healing process, areas of neovascularization developed beneath the exposed part of the outer table and the necrotic bone underwent resorption. [less ▲]

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