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See detailDerjaguin-Broekhoff-de Boer analysis of adsorption in very disordered mesopores using probabilistic models
Gommes, Cédric ULg

Poster (2015, May)

Our current ability to produce mesoporous materials with ordered morphology has raised fascinating questions about the impact of geometrical disorder on adsorption and desorption states [1]. Many recent ... [more ▼]

Our current ability to produce mesoporous materials with ordered morphology has raised fascinating questions about the impact of geometrical disorder on adsorption and desorption states [1]. Many recent works have investigated the role of mild elements of disorder, such as local constriction or corrugation superimposed to otherwise geometrically ideal cylindrical pores [2,3]. These works have notably shown that elements of disorder may act as nucleation sites and destabilize vapor-like metastable states. The relevance of these perturbation-like results to fundamentally disordered materials, such as gels, is unclear. In particular, do vapor-like metastable states exist at all in this type of very disordered material? In the present communication, we address this question using probabilistic models to investigate the role of disorder. We generalize the classical Gaussian field models of porous materials [4] and use them to analyze adsorption and desorption in the Derjaguin-Broekhof-de Boer approximation. Our approach differs from earlier contributions in that both the adsorbent and the adsorbate are described in terms of probabilities [5]. This enables us to analyze the adsorbate configuration in very disordered solids using a low-dimensional yet realistic configuration space. We notably show that vapor-like metastable states are unlikely in gel-like disordered materials. [1] D.Wallacher, N. Künzner, D. Kovalev, N. Knorr, K. Knorr, Capillary condensation in linear mesopores of different shape, Phys. Rev. Lett. 92 (2004) 195704; [2] B. Coasne, A. Galarneau, F. Di Renzo, R.M.J. Pellenq, Effect of morphological defects on gas adsorption in nanoporous silicas, J. Phys. Chem. C 111 (2007) 15759; [3] C.J. Gommes, Adsorption, capillary bridge formation, and cavitation in SBA-15 corrugated mesopores: A Derjaguin-Broekhoff-de Boer analysis, Langmuir 28 (2012) 5101-5115; [4] R.J. Pellenq, P. levitz, Capillary condensation in a disordered mesoporous medium: A grand canonical Monte Carlo study, Molecular Physics 100 (2002) 2059;[5] C.J. Gommes, A.P. Roberts, in preparation. [less ▲]

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See detailGene expression of cytokines, growth factors and apoptosis regulators in a neonatal model of pulmonary stenosis.
Liersch, Peter N.; Schwarz, Andreas; Sachweh, Joerg et al

in Future cardiology (2015), 11(3), 297-307

ABSTRACT Background: Right ventricular remodeling due to pulmonary stenosis increases morbidity in children. Its pathophysiology needs to be clarified. METHODS: Six newborn lambs underwent pulmonary ... [more ▼]

ABSTRACT Background: Right ventricular remodeling due to pulmonary stenosis increases morbidity in children. Its pathophysiology needs to be clarified. METHODS: Six newborn lambs underwent pulmonary arterial banding, seven sham operation. mRNA encoding for cytokines, growth factors and regulators of apoptosis was sequentially measured in myocardium and blood before and up to 12 weeks postoperatively. RESULTS: Experimental animals showed hypertrophy and fibrosis of the right ventricular myocardium, myocardial over-expression of CT-1-mRNA and higher blood concentrations of mRNA encoding for VEGF, TGF-beta, Bak and BcL-xL than controls, respectively. CONCLUSION: Neonatal pulmonary stenosis leads to myocardial hypertrophy that is associated with CT-1 gene expression and with activation of growth- and apoptosis pathways in blood cells. [less ▲]

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See detailNanometer-scale wetting transitions in mesopores: a SAXS analysis
Gommes, Cédric ULg

Conference (2015, May)

The equilibrium and metastable configurations of confined binary liquids has been a topic of research since the early work of Liu et al. in the nineties [1]. In particular, it has been proposed ... [more ▼]

The equilibrium and metastable configurations of confined binary liquids has been a topic of research since the early work of Liu et al. in the nineties [1]. In particular, it has been proposed theoretically that liquids may coexist inside nanopores in the form of layers covering uniformly the solid surface, of plugs filling locally the pore space, or of capsules floating in the middle of the pores. In the present contribution, we report in situ synchrotron small-angle scattering (SAXS) experiments on hexane/nitrobenzene solutions confined in mesoporous carbon xerogels [2]. The SAXS shows that these systems exhibit reversible temperature-induced transitions between the layer and the plug configurations. The scattering data is analyzed using a so-called plurigaussian model, which enables us to reconstruct the configurations of the confined liquids, and quantitatively analyze the wetting transitions at the nanometer-scale in terms of changing interface areas, contact angles, and triple-line lengths. [less ▲]

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See detailUse of 454 pyrosequencing protocol for the assessment of cyanobacterial diversity
Stelmach Pessi, Igor ULg; De Carvalho, Pedro; Laughinghouse, Haywood Dail et al

Poster (2015, May)

A pilot run was carried out on Antarctic microbial mat samples in order to test different protocols for 454 pyrosequencing and bioinformatic analyses. An artificial community was assembled using22 ... [more ▼]

A pilot run was carried out on Antarctic microbial mat samples in order to test different protocols for 454 pyrosequencing and bioinformatic analyses. An artificial community was assembled using22 cyanobacterial strains in two different abundance distributions. Bioinformatic analyses were carried out on the artificial communities using variations of the mothur and UPARSE pipelines. Moreover, different DNA extraction methods, technical replicates and biases arising from direct barcoded primer amplification were assessed using five microbial mat and soil crust samples. A great variation in richness estimates was observed using different bioinformatic pipelines, with UPARSE generating the most consistent results. On the other hand, community structures observed using different DNA extraction protocols were statistically similar. The same was observed for the technical replicates. Moreover, the use of barcoded primers did not influence the observed community structure. [less ▲]

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See detailAura
Durand, Pascal ULg

E-print/Working paper (2015)

Entrée du Lexique Socius sur le concept d'Aura chez Walter Benjamin

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See detailThe effects of perinatal exposure to polychlorinated biphenyls on hippocampal neurogenesis
Pinson, Anneline ULg; Parent, Anne-Simone ULg; chatzi, christina et al

Poster (2015, May)

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See detailEnergie et alimentation: vers une réappropriation citoyenne?
Bauwens, Thomas ULg; Marcq, Pascal

Article for general public (2015)

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See detailModes de rémunération des médecins généralistes : quelles conséquences ?
Saint-Lary, Olivier; Franc, Carine; Raginel, Thibaud et al

in Exercer (2015), 119

Introduction. The health reform law crystallizes the tensions between the different health system players. Besides the specific issue of third-party payment, which will be addressed in an upcoming article ... [more ▼]

Introduction. The health reform law crystallizes the tensions between the different health system players. Besides the specific issue of third-party payment, which will be addressed in an upcoming article, some professional organizations wish to strengthen fee for servicies while others call for more mixed forms of remuneration. Many economic analyses were conducted to study the benefits and limits of each mode of physician compensation. This article offers a synthesis of the literature about these modes: fee for service, capitation, payment performance and wage labor. Method. Collaborative literature analysis between doctors and health economist. The databases searched were MEDLINE, the Cochrane Library and CAIRN. Results. Each mode has specific benefits and limits for the financer, the physicians and the patients. Fee for services increases physician productivity but may increases health spending. Capitation and salary decrease care supply but might help to control health spending and to develop preventive activities. The effectiveness of pay for performance is now being questioned. The current trend is to promote mixed forms of remuneration, hoping to combine the advantages and limit the share of defects of each modality. The complexity of such systems makes it difficult to compare from one country to another. Discussion. The choice of a mode by the financer must take into account both the possible combinations of different payment methods and the developments or societal aspirations to meet population health needs. [less ▲]

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See detailLa mort du militantisme wallon ? Quand le coq rentre au poulailler (1958-1963). Etude d'après les sources
Genin, Vincent ULg

Book published by Province de Liège/Musée de la Vie Wallonne (2015)

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See detailLa fraude en droit patrimonial international : le cas des successions internationales
Wautelet, Patrick ULg

in De Page, Philippe; Culot, André; De Stefani, Isabelle (Eds.) Apaprences, simulations, abus et fraude - Aspects civils et fiscaux (2015)

Cette contribution s'interroge sur la possibilité d'utiliser la technique de la fraude à la loi dans les relations privées internationales, en visant spécialement le droit patrimonial familial. Après un ... [more ▼]

Cette contribution s'interroge sur la possibilité d'utiliser la technique de la fraude à la loi dans les relations privées internationales, en visant spécialement le droit patrimonial familial. Après un examen général des principes qui structurent la fraude à la loi en droit international privé contemporain, la contribution analyse l'usage potentiel de cette technique sous l'empire du Règlement 650/2012 consacré aux successions internationales. [less ▲]

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See detailLa nationalité belge en 2015 - qui sont les belges?
Wautelet, Patrick ULg

Learning material (2015)

Cette présentation a servi de support à un exposé (3 h) consacré aux principes fondamentaux de la nationalité belge. L'accent a été mis sur les principes généraux permettant l'accès à la nationalité belge ... [more ▼]

Cette présentation a servi de support à un exposé (3 h) consacré aux principes fondamentaux de la nationalité belge. L'accent a été mis sur les principes généraux permettant l'accès à la nationalité belge aux personnes en situation migratoire. Cette intervention a eu lieu dans le cadre d'un certificat interuniversitaire en Migrations, Diversité ethnique et Relations interculturelles [less ▲]

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See detailVitamine D et lithiases rénales : la pierre d'achoppement
CAVALIER, Etienne ULg; GADISSEUR, Romy ULg; Castiglione, Vincent ULg

in Benhamou, Claude-Laurent; Souberbielle, Jean-Claude (Eds.) La vitamine D chez l'adulte (2015)

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See detailSynthèse des données gétechniques nécessaires à l'étude de la stabilité de six terrils à risque en région liégeoise
Delvoie, Simon ULg; Collin, Frédéric ULg

Report (2015)

Dans le cadre d’un recensement des terrils situés en Région wallonne et pouvant présenter des risques de stabilité sur le court et le long terme, l’ISSeP a chargé le Laboratoire de Géotechnologies de ... [more ▼]

Dans le cadre d’un recensement des terrils situés en Région wallonne et pouvant présenter des risques de stabilité sur le court et le long terme, l’ISSeP a chargé le Laboratoire de Géotechnologies de l’Université de Liège, représenté par Ir. F. COLLIN et S. DELVOIE, de réaliser une étude géotechnique préliminaire. Les objectifs de ce travail sont tout d’abord de recenser les informations disponibles sur le sous-sol aux environs immédiats des terrils. Les données recueillies sont ensuite exploitées par des outils informatiques SIG et seront par la suite utilisées dans l’évaluation du risque d’instabilité, réalisée par l’ISSeP. Ce travail documentaire est également complété par une inspection sur le terrain de chaque terril étudié. Les terrils faisant partie de l’étude géotechnique sont repris dans la liste ci-dessous : - L60 – Petite Bacnure - L53 – Gosson 2 - L39 – Bonne Espérance et Bonne Fortune - L46 – Xhorre - L41 – Espérance 3 - L55 – Horloz [less ▲]

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See detailFast Chromatographic Method for Explosive Profiling
Stefanuto, Pierre-Hugues ULg; Perrault, Katelynn A.; Focant, Jean-François ULg et al

in Chromatography (2015), 2

Security control is becoming a major global issue in strategic locations, such as airports, official buildings, and transit stations. The agencies responsible for public security need powerful and ... [more ▼]

Security control is becoming a major global issue in strategic locations, such as airports, official buildings, and transit stations. The agencies responsible for public security need powerful and sensitive tools to detect warfare agents and explosives. Volatile signature detection is one of the fastest and easiest ways to achieve this task. However, explosive chemicals have low volatility making their detection challenging. In this research, we developed and evaluated fast chromatographic methods to improve the characterization of volatile signatures from explosives samples. The headspace of explosives was sampled with solid phase micro-extraction fiber (SPME). Following this step, classical gas chromatography (GC) and comprehensive two-dimensional GC (GC×GC) were used for analysis. A fast GC approach allows the elution temperature of each analyte to be decreased, resulting in decreased thermal degradation of sensitive compounds (e.g., nitro explosives). Using fast GC×GC, the limit of detection is further decreased based on the cryo-focusing effect of the modulator. Sampling of explosives and chromatographic separation were optimized, and the methods then applied to commercial explosives samples. Implementation of fast GC methods will be valuable in the future for defense and security forensics applications. [less ▲]

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See detailCorporate board attributes and conditional accounting conservatism: Evidence from French firms
Boussaid, Nabila ULg; Sougné, Danielle ULg; Hamza, Taher

in Journal of Applied Business Research (2015), Vol 31, No 3 (2015)

We investigate the relationship between corporate board of directors’ attributes and conditional accounting conservatism in the French context. Using a pooled regression model over the period 2009-2012 ... [more ▼]

We investigate the relationship between corporate board of directors’ attributes and conditional accounting conservatism in the French context. Using a pooled regression model over the period 2009-2012, our empirical results can be summarized as follows. First, greater board activity encourages more conservative reporting in financial statements. Second, larger board size diminishes conditional accounting conservatism. Lastly, there is a positive association between gender diversity and accounting conservatism. As a robustness test, we use alternative measures of accounting conservatism, namely time series and accrual-based measures in addition to asymmetric timeliness of earnings. Our findings suggest that boards of directors’ attributes are an important factor in determining the financial reporting quality of French firms. [less ▲]

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See detailPRESPHOTO project - Preservation of microalgae in the BCCM collections
Crahay, Charlotte ULg; Deprez, Karolien; Vanormelingen, Pieter et al

Poster (2015, May)

The implementation of reliable preservation technologies of the biological resources is crucial for the management of the Biological Ressources Centers. PRESPHOTO, a BRAIN.be project, aims to develop and ... [more ▼]

The implementation of reliable preservation technologies of the biological resources is crucial for the management of the Biological Ressources Centers. PRESPHOTO, a BRAIN.be project, aims to develop and optimize new and cost-effective preservation techniques of photosynthetic microalgae (diatoms and cyanobacteria) in the two BCCM collections, BCCM/DCG and BCCM/ULC. This is a critical factor for the future growth and valorisation of these collections. Firstly, the traditional two-step cryopreservation technique will be adapted to photosynthetic microalgae strains. In particular, we will examine the effects of the culture conditions, the type and concentration of cryoprotectants, and the preservation temperature on the survival of microalgae. The encapsulation/dehydration technique as alternative to the two-step cryopreservation method will be also evaluated. Moreover, an independent validation of the developed protocols will be performed by the Culture Collection of Algae and Protozoa (UK) (subcontractor). Secondly, we will perform genome resequencing of selected strains to investigate the genetic changes induced by different cryopreservation techniques. Finally, a high-quality genomic DNA bank will be established and validated. [less ▲]

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See detailBRAIN TRAINS: Intermodal rail freight transport and hinterland connections A SWOT analysis to assess the Belgian rail practice
Troch, Frank; Vanelslander, Thierry; Belboom, Sandra ULg et al

Scientific conference (2015, May)

This paper focuses on transversal research of the role and influences of rail freight transport, as a part of intermodal transport in Belgium. A SWOT analysis of the current situation is conducted ... [more ▼]

This paper focuses on transversal research of the role and influences of rail freight transport, as a part of intermodal transport in Belgium. A SWOT analysis of the current situation is conducted, starting from the actual weak usage of this mode of transport. Five different fields have been identified, impacting the economy and society. Each field indicates critical internal strengths and weaknesses for intermodal rail transportation in Belgium, and identifies possible future developments and setbacks. A Delphi-like approach is used, including a heterogeneous panel of experts, discussing and validating the SWOT results. To prioritize the characteristics, a survey on the different SWOT elements is performed, asking the experts to rate each statement on its influence and likelihood of happening, indicating the level of uncertainty. [less ▲]

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See detailSynedrella nodiflora (L.) Gaertn : a review on its phytochemical screening and uses in animal husbandry and medicine
Adjibode, A.G.; Tougan, U.P.; Youssao, A.K.I. et al

in International Journal of Advanced Scientific and Technical Research (2015), 3

Detailed reference viewed: 12 (0 ULg)