Last 7 days
Bookmark and Share    
Full Text
Peer Reviewed
See detailDevelopment by the sol–gel process of highly dispersed Ni–Cu/SiO2 xerogel catalysts for selective 1,2-dichloroethane hydrodechlorination into ethylene
Pirard, Sophie ULg; Mahy, Julien ULg; Pirard, Jean-Paul ULg et al

in Microporous and Mesoporous Materials (in press)

Ni–Cu/SiO2 xerogel catalysts have been synthesized by cogelation of industrial tetraethoxysilane (Dynasil) and chelates of Ni and Cu with industrial 3-(2-aminoethylamino)propyltrimethoxysilane (Dynasylan ... [more ▼]

Ni–Cu/SiO2 xerogel catalysts have been synthesized by cogelation of industrial tetraethoxysilane (Dynasil) and chelates of Ni and Cu with industrial 3-(2-aminoethylamino)propyltrimethoxysilane (Dynasylan DAMO) in industrial ethanol denatured with diethyl phthalate. Despite the use of industrial grade reagents, highly dispersed bimetallic Ni–Cu/SiO2 xerogel catalysts were obtained. These samples are composed of completely accessible Ni–Cu alloy crystallites with sizes of 1.6–3.4 nm located inside silica particles exhibiting a monodisperse microporous distribution. It appears that the bimetallic complex acts as a nucleation agent in the formation of silica particles. The combination of results obtained from the calculation of the metal ratio in catalysts, H2 chemisorption and transmission electron microscopy allowed calculating the surface composition of the nickel–copper particles in Ni–Cu/SiO2 cogelled xerogel catalysts. Values obtained indicate a very pronounced surface enrichment with copper. While 1,2-dichloroethane hydrodechlorination over pure nickel mainly produces ethane, increasing copper content in bimetallic catalysts results in an increase in ethylene selectivity. The specific consumption rate of 1,2-dichloroethane decreases when copper loading increases. The turnover frequency, that is, the number of catalytic cycle per active site (nickel atom and its surrounding copper atoms) and per second, seems to be independent of surface composition of alloy particles. [less ▲]

Detailed reference viewed: 10 (2 ULg)
Peer Reviewed
See detailIntroduction
de Haro Sanchez, Magali ULg; Tissi, Lucia Maddalena

in de Haro Sanchez, Magali (Ed.) "Écrire la magie dans l'Antiquité - Scrivere la magia nell'Antichità". Actes du colloque international (Liège, 13-15 octobre 2011) (in press)

Detailed reference viewed: 16 (1 ULg)
Full Text
Peer Reviewed
See detailSimultaneous enforcement of constraints at position and velocity levels in the nonsmooth generalized-alpha scheme
Bruls, Olivier ULg; Acary, Vincent; Cardona, Alberto

in Computer Methods in Applied Mechanics & Engineering (in press)

This paper presents a formalism for the transient simulation of nonsmooth dynamic mechanical systems composed of rigid and flexible bodies, kinematic joints and frictionless contact conditions. The ... [more ▼]

This paper presents a formalism for the transient simulation of nonsmooth dynamic mechanical systems composed of rigid and flexible bodies, kinematic joints and frictionless contact conditions. The proposed algorithm guarantees the exact satisfaction of the bilateral and unilateral constraints both at position and velocity levels. Thus, it significantly differs from penalty techniques since no penetration is allowed. The numerical scheme is obtained in two main steps. Firstly, a splitting method is used to isolate the contributions of impacts, which shall be integrated with only first-order accuracy, from smooth contributions which can be integrated using a higher order scheme. Secondly, following the idea of Gear, Gupta and Leimkuhler, the equations of motion are reformulated so that the bilateral and unilateral constraints appear both at position and velocity levels. After time discretization, the equations of motion involve two complementarity conditions and it can be solved at each time step using a monolithic semi-smooth Newton method. The numerical behaviour of the proposed method is studied and compared to other approaches for a number of numerical examples. It is shown that the formulation offers a unified and valid approach for the description of contact conditions between rigid bodies as well as between flexible bodies. [less ▲]

Detailed reference viewed: 26 (2 ULg)
Full Text
Peer Reviewed
See detailLarval development sites of the main Culicoides species (Diptera: Ceratopogonidae) in northern Europe and distribution of coprophilic species larvae in Belgian pastures
Zimmer, Jean-Yves ULg; Brostaux, Yves ULg; Haubruge, Eric ULg et al

in Veterinary Parasitology (in press)

Some Culicoides species of biting midges (Diptera: Ceratopogonidae) are biological virus vectors worldwide and have indeed been associated with outbreaks of important epizoonoses in recent years, such as ... [more ▼]

Some Culicoides species of biting midges (Diptera: Ceratopogonidae) are biological virus vectors worldwide and have indeed been associated with outbreaks of important epizoonoses in recent years, such as bluetongue and Schmallenberg disease in northern Europe. These diseases, which affect domestic and wild ruminants, have caused considerable economic losses. Knowledge of substrates suitable for Culicoides larval development is important, particularly for the main vector temperate species. This study, realized during two years, aimed to highlight the larval development sites of these biting midge species in the immediate surroundings of ten Belgian cattle farms. Moreover, spatial distribution of the coprophilic Culicoides larvae (C. chiopterus and C. dewulfi) within pastures was studied with increasing distance from farms along linear transects (farm–pasture–woodland). A total of 4347 adult specimens belonging to 13 Culicoides species were obtained by incubation of 2131 soil samples belonging to 102 different substrates; 18 of these substrates were suitable for larval development. The Obsoletus complex (formed by two species) was observed in a wide range of substrates, including silage residues, components of a chicken coop, dung adhering to walls inside stables, leftover feed along the feed bunk, a compost pile of sugar beet residues, soil of a livestock trampling area, and decaying wood, while the following served as substrates for the other specimens: C. chiopterus, mainly cow dung; C. dewulfi, cow dung and molehill soil; C. circumscriptus, algae; C. festivipennis, algae and soil in stagnant water; C. nubeculosus, algae and silt specifically from the edge of a pond; C. punctatus, mainly wet soil between silage reserves; C. salinarius, algae; and C. stigma, algae and wet soil between silage reserves. We also recorded significantly higher densities of coprophilic larvae within pastures in cow dung located near forests, which is likely due to the localization of potential hosts; the presence of these larvae within cow dung is, however, uninfluenced by relative distance from farms. A better knowledge of the microhabitats of Culicoides biting midges and their spatial distribution may allow the development of targeted species-specific vector control strategies, and may help to prevent the creation of new larval development sites. [less ▲]

Detailed reference viewed: 4 (1 ULg)
Full Text
Peer Reviewed
See detailInteraction between dietary protein content and the source of carbohydrates along the gastrointestinal tract of weaned piglets.
Pieper, Robert; Boudry, Christelle ULg; Bindelle, Jérôme ULg et al

in Archives of Animal Nutrition (in press)

Although fermentable carbohydrates (CHO) can reduce metabolites derived from dietary protein fermentation in the intestine of pigs, the interaction between site of fermentation and substrate availability ... [more ▼]

Although fermentable carbohydrates (CHO) can reduce metabolites derived from dietary protein fermentation in the intestine of pigs, the interaction between site of fermentation and substrate availability along the gut is still unclear. The current study aimed at determining the impact of two different sources of carbohydrates in diets with low or very high protein content on microbial metabolite profiles along the gastrointestinal tract of piglets. Thirty-six piglets (n = 6 per group) were fed diets high (26%, HP) or low (18%, LP) in dietary protein and with or without two different sources of carbohydrates (12% sugar beet pulp, SBP, or 8% lignocellulose, LNC) in a 2 × 3 factorial design. After 3 weeks, contents from stomach, jejunum, ileum, caecum, proximal and distal colon were taken and analysed for major bacterial metabolites (D-lactate, L-lactate, short chain fatty acids, ammonia, amines, phenols and indols). Results indicate considerable fermentation of CHO and protein already in the stomach. HP diets increased the formation of ammonia, amines, phenolic and indolic compounds throughout the different parts of the intestine with most pronounced effects in the distal colon. Dietary SBP inclusion in LP diets favoured the formation of cadaverine in the proximal parts of the intestine. SBP mainly increased CHO-derived metabolites such as SCFA and lactate and decreased protein-derived metabolites in the large intestine. Based on metabolite profiles, LNC was partly fermented in the distal large intestine and reduced mainly phenols, indols and cadaverine, but not ammonia. Multivariate analysis confirmed more diet-specific metabolite patterns in the stomach, whereas the CHO addition was the main determinant in the caecum and proximal colon. The protein level mainly influenced the metabolite patterns in the distal colon. The results confirm the importance of CHO source to influence the formation of metabolites derived from protein fermentation along the intestinal tract of the pig. [less ▲]

Detailed reference viewed: 4 (2 ULg)
Full Text
Peer Reviewed
See detailAmulettes coptes « jumelles » de Strasbourg : P.Strasb. K 201 et K 202
de Haro Sanchez, Magali ULg

in Boud'hors; Delattre; Louis, Catherine (Eds.) et al Études coptes XII (in press)

Detailed reference viewed: 19 (4 ULg)
Full Text
Peer Reviewed
See detailL'idéologie de la Nieuw‐Vlaamse Alliantie
Jamin, Jérôme ULg

in Revue européenne de géopolitique Outre-Terre (in press)

Detailed reference viewed: 26 (7 ULg)
Full Text
Peer Reviewed
See detailMathématiques convoquées par le registre graphique au sein du cours de physique
Renkens, Céline; Henry, Valérie ULg

in Actes de la CIEAEM 66 (in press)

Detailed reference viewed: 11 (0 ULg)
See detailMurs, Frontières et Liberté(s) de Circulation
Gemenne, François ULg

Book published by Fayard (in press)

Detailed reference viewed: 27 (6 ULg)
Full Text
Peer Reviewed
See detailInfluence of COMT Genotype on Antero-Posterior Cortical Functional Connectivity Underlying Interference Resolution
Jaspar, Mathieu ULg; Manard, Marine ULg; DIDEBERG, Vinciane ULg et al

in Cerebral Cortex (in press)

Genetic variability related to the catechol-O-methyltransferase (COMT) gene (Val158Met) has received increasing attention as a possible modulator of executive functioning and its neural correlates ... [more ▼]

Genetic variability related to the catechol-O-methyltransferase (COMT) gene (Val158Met) has received increasing attention as a possible modulator of executive functioning and its neural correlates. However, this attention has generally centred on the prefrontal cortices because of the well-known direct impact of COMT enzyme on these cerebral regions. In this study, we were interested in the modulating effect of COMT genotype on anterior and posterior brain areas underlying interference resolution during a Stroop task. More specifically, we were interested in the functional connectivity between the right inferior frontal operculum (IFop), an area frequently associated with inhibitory efficiency, and posterior brain regions involved in reading/naming processes (the two main non-executive determinants of the Stroop effect). The Stroop task was administered during fMRI scanning to three groups of 15 young adults divided according to their COMT Val158Met genotype [Val/Val (VV), Val/Met (VM) and Met/Met (MM)]. Results indicate greater activity in the right IFop and the left middle temporal gyrus (MTG) in homozygous VV individuals than in Met allele carriers. In addition, the VV group exhibited stronger positive functional connectivity between these two brain regions and stronger negative connectivity between the right IFop and left lingual gyrus. These results confirm the impact of COMT genotype on frontal function. They also strongly suggest that differences in frontal activity influence posterior brain regions related to a non-executive component of the task. Especially, changes in functional connectivity between anterior and posterior brain areas might correspond to compensatory processes for performing the task efficiently when the available dopamine level is low. [less ▲]

Detailed reference viewed: 20 (3 ULg)
Full Text
Peer Reviewed
See detailOsteoporosis in patients taking selective serotonin reuptake inhibitors: a focus on fracture outcome
Bruyère, Olivier ULg; Reginster, Jean-Yves ULg

in Endocrine (in press)

Depression is one of the most important mental health problems and a leading cause of disability. Selective serotonin reuptake inhibitors (SSRIs) are considered as first-line therapy for the treatment of ... [more ▼]

Depression is one of the most important mental health problems and a leading cause of disability. Selective serotonin reuptake inhibitors (SSRIs) are considered as first-line therapy for the treatment of depressive symptoms among older adults because of their presumed favorable adverse effect profile. However, they could have deleterious effects on the bone. Evidence from longitudinal, crosssectional, and prospective cohort studies suggests that the use of antidepressants at therapeutic doses is associated with decreased bone mineral density and increased fracture risk. The association between SSRIs use and fracture risk could potentially differ depending on dose, exposure duration, time of exposure, age, or sex. However, the risk of fracture declined rapidly after discontinuation of use of SSRIs. The evidence now seems sufficient to consider adding SSRIs to the list of medications that contribute to osteoporosis. In practice, assessment of risk factor for osteoporosis or fractures could be made taking into account age, gender, duration, and severity of depression, length of SSRI treatments, and other concurrent risk factors. [less ▲]

Detailed reference viewed: 12 (6 ULg)
Full Text
See detailA l'ombre de Sainte-Waudru. L'architecture religieuse dans la prévôté de Mons aux XVe et XVIe siècles
Joly, Emmanuel ULg

Article for general public (in press)

La pose de la première pierre de la nouvelle collégiale Sainte-Waudru le 9 mars 1450 marque le début d’un chantier qui s’étalera sur plus de deux siècles. Pendant ce temps, la ville de Mons ainsi que la ... [more ▼]

La pose de la première pierre de la nouvelle collégiale Sainte-Waudru le 9 mars 1450 marque le début d’un chantier qui s’étalera sur plus de deux siècles. Pendant ce temps, la ville de Mons ainsi que la circonscription administrative dont elle est le centre se dotent de nombreux autres édifices religieux. Ces modestes collégiales ou églises paroissiales (voire succursales) grandissent à l’ombre de Sainte-Waudru et présentent des partis constructifs souvent très différents de ceux mis en œuvre à la grande collégiale montoise. Pourtant, à l’inverse de la collégiale Sainte-Waudru , ces architectures ont rarement fait l’objet de publications scientifiques et restent dès lors fort méconnues. [less ▲]

Detailed reference viewed: 14 (3 ULg)
Full Text
See detailL'église Saint-Julien d'Ath avant 1817 : essai de reconstitution d'un édifice disparu
Joly, Emmanuel ULg

Article for general public (in press)

L’état de l’église Saint-Julien avant l’incendie de 1817 est fort méconnu, bien que les parties gothiques de l’édifice fassent régulièrement l’objet de descriptions, de notices, de mentions voire ... [more ▼]

L’état de l’église Saint-Julien avant l’incendie de 1817 est fort méconnu, bien que les parties gothiques de l’édifice fassent régulièrement l’objet de descriptions, de notices, de mentions voire d’analyses dans les synthèses consacrées à l’architecture médiévale en Belgique ou en Hainaut. Or pour pouvoir procéder à des comparaisons et replacer l’église dans l’architecture de son époque, il est important d’en avoir une image fidèle. Il faut donc nous pencher sur les divers types de sources (iconographiques, textuelles et archéologiques) à notre disposition pour reconstituer l’église dans son aspect antérieur à 1817. [less ▲]

Detailed reference viewed: 11 (2 ULg)
Full Text
Peer Reviewed
See detailA mysterious giant ichthyosaur from the lowermost Jurassic of Wales
Martin, Jeremy E; Vincent, Peggy; Suan, Guillaume et al

in Acta Palaeontologica Polonica (in press)

Ichthyosaurs rapidly diversified and colonised a wide range of ecological niches during the Early and Middle Triassic period, but experienced a major decline in diversity near the end of the Triassic ... [more ▼]

Ichthyosaurs rapidly diversified and colonised a wide range of ecological niches during the Early and Middle Triassic period, but experienced a major decline in diversity near the end of the Triassic. Timing and causes of this demise and the subsequent rapid radiation of the diverse, but less disparate, parvipelvian ichthyosaurs are still unknown, notably because of inadequate sampling in strata of latest Triassic age. Here, we describe an exceptionally large radius from Lower Jurassic deposits at Penarth near Cardiff, South Wales (UK) the morphology of which places it within the giant Triassic shastasaurids. A tentative total body size estimate, based on a regression analysis of various complete ichthyosaur skeletons, yields a value of 12-15 m. The specimen is substantially younger than any previously reported last known occurrences of shastasaurids and implies a Lazarus range in the lowermost Jurassic for this ichthyosaur morphotype. [less ▲]

Detailed reference viewed: 21 (3 ULg)
Full Text
Peer Reviewed
See detailFatal transmission of contagious caprine pleuropneumonia to an Arabian oryx (Oryx leucoryx)
Chaber, AL; Lignereux, L; Al Qassimi, M et al

in Veterinary Microbiology (in press)

Detailed reference viewed: 11 (0 ULg)
Full Text
Peer Reviewed
See detailBayesian versus frequentist methods for estimating disease true prevalence and 4 diagnostic test performance
Sanogo, M; Abatih, E; Saegerman, Claude ULg

in Veterinary Journal (in press)

Detailed reference viewed: 11 (1 ULg)
Full Text
Peer Reviewed
See detailMonitoring of osteoporosis therapy
Bruyère, Olivier ULg; Reginster, Jean-Yves ULg

in Best Practice & Research. Clinical Endocrinology & Metabolism (in press)

Over the past two decades, major advances have been made in the number and range of agents available for the treatment of osteoporosis, all with proven anti-fracture efficacy. Unfortunately, compliance ... [more ▼]

Over the past two decades, major advances have been made in the number and range of agents available for the treatment of osteoporosis, all with proven anti-fracture efficacy. Unfortunately, compliance with these treatments is not optimal, and a number of patients could be considered as non-responders. Consequently, monitoring anti-osteoporotic therapy could be part of successful osteoporosis management. Currently, no formal well-accepted clinical practice guidelines are available for monitoring anti-osteoporosis therapies. Changes in bone mineral density and bone turnover markers, while on therapy, have potential value in monitoring treatment but their assessment and, consequently, their benefits could be limited by metrological and clinical issues. Moreover, their effectiveness is probably drug dependant. Recommendation for the standardisation of the methodology when analysing the potential relevance of tools for the monitoring of osteoporosis therapy is needed. [less ▲]

Detailed reference viewed: 14 (6 ULg)