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See detailPrevalence and characteristics of group B streptococcus colonization in HIV-infected pregnant women in Belgium
DAUBY, Nicolas; ADLER, Catherine; Y MIENDJE DEYI, Véronique et al

Poster (2017, October)

Objectives: High incidence of GBS sepsis has been reported in HIV-exposed but uninfected (HEU) infants in both developed and developing countries, particularly late-onset diseases. We aimed determining ... [more ▼]

Objectives: High incidence of GBS sepsis has been reported in HIV-exposed but uninfected (HEU) infants in both developed and developing countries, particularly late-onset diseases. We aimed determining the prevalence, the characteristics and the risk factors of GBS carriage in HIV-infected and HIV uninfected pregnant women (PW). Methods : Between 1/01/2011 and 31/12/2013, HIV-infected (n=132) and uninfected (n=123) PW had recto-vaginal swabs for GBS detection performed at 35-37 weeks of gestation and at deliver Demographic, obstetrical and medical data related to HIV-infection were prospectively collected. Serotyping of GBS strains was performed on a limited number of randomly selected samples (26 from HIV-infected and 13 from uninfected PW). Results : The overall prevalence of GBS carriage was not statistically different between HIV-infected and uninfected PW (31% vs 24,4% respectively). Age, nadir CD4 cell count, CD4 cell count at delivery and detectable viral load at delivery were not associated with GBS carriage rate in HIV-infected PW. A distinct pattern of GBS serotype was found in HIV-infected PW who were predomina colonized by serotype III (12/26) while HIV-uninfected PW were mostly colonized by serotype Ia (8/13) (p<0,05). Conclusions: As previously reported in other countries, HIV-infected PW do not have significantly higher rate of GBS colonization. However, our results suggest that HIV-infected PW are more lik be colonized with serotype III strains, that is the main serotype associated with late-onset neonatal sepsis. Ongoing research aims at characterizing the clonal features of the isolated strains [less ▲]

See detailVive les hauts-fourneaux! Vers une reconnaissance du patrimoine sidérurgique en Wallonie
Drouguet, Noémie ULg; Bodeux, Philippe

Book published by Urbagora (2017)

Marcinelle, Ougrée, Clabecq. Trois hauts-lieux de production de fonte et d'acier, dominés par la figure emblématique des hauts-founeaux. A l'arrêt depuis plusieurs années, devenus des friches, ils sont ... [more ▼]

Marcinelle, Ougrée, Clabecq. Trois hauts-lieux de production de fonte et d'acier, dominés par la figure emblématique des hauts-founeaux. A l'arrêt depuis plusieurs années, devenus des friches, ils sont appelés à disparaître prochainement. Avant qu’ArcelorMittal et Duferco ne rasent ces vestiges, les questions de régénération des sites et de préservation du patrimoine sont à étudier conjointement. Fermées, grillagées et laissées à l’abandon, ces forêts industrielles doivent s’ouvrir à ceux qui ont des propositions à défendre, qu'ils soient urbanistes, architectes, promoteurs, artistes, passeurs de mémoire. Les bassins voisins –la Ruhr, la Sarre ou la Lorraine – ont chacun gardé des témoins de l’épopée industrielle pour les recycler en parcs paysagers, musées, ville nouvelle ou espaces économiques. Point de départ de la révolution industrielle sur le continent, la Wallonie ne peut faire l’impasse sur une réflexion approfondie concernant le devenir des friches sidérurgiques. Ce numéro hors-série de Dérivation pose la question et tente de documenter le débat, plus complexe qu'il n'y paraît. Il entend à la fois plonger dans une réalité où se mêlent ville et industrie, en décrire ce qui échappe aux regards, mais aussi donner la parole à ceux qui l’ont côtoyée de près et amener quelques propositions. [less ▲]

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See detailLe Stress Oxydant: arnaque ou biologie d'avenir?
LE GOFF, Caroline ULg

Conference (2017, September 28)

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See detailA mathematical model of respiration under protective ventilation and extracorporeal CO2 removal therapy
Habran, Simon ULg; Desaive, Thomas ULg; MORIMONT, Philippe ULg et al

Conference (2017, September 27)

The aim of the present study is to build a mathematical model of the respiratory system connected to an extracorporeal CO2 removal device (ECCO2RD) to optimize the gas exchanges efficiency. The model must ... [more ▼]

The aim of the present study is to build a mathematical model of the respiratory system connected to an extracorporeal CO2 removal device (ECCO2RD) to optimize the gas exchanges efficiency. The model must be simple enough to provide rapid solutions and to estimate specific parameters from available clinical data. But it also must be complex enough to be able to simulate the respiratory system when protective ventilation is used and when this system is assisted by an ECCO2RD. [less ▲]

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See detailConférence d'ouverture : La morale de 1964 : une écriture en débats
Cormann, Grégory ULg; Bourgault, Jean

Conference (2017, September 22)

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See detailPerformance-based fire design and the U.S. prescriptive guidelines: A comparative study
Elhami Khorasani, Negar; Fang, Chenyang; Gernay, Thomas ULg

in Proceedings of the 39th IABSE Symposium (2017, September 21)

Current codes and standards for fire design of structures in the United States are mainly based on design at the component level using prescriptive approaches, while performance-based design for fire can ... [more ▼]

Current codes and standards for fire design of structures in the United States are mainly based on design at the component level using prescriptive approaches, while performance-based design for fire can be used to address the needs for designing modern buildings with cost-effective solutions. Previous research shows that, when system-level performance is considered, fire protection on secondary beam elements in composite steel-concrete floor systems is not necessary due to the development of a membrane action in the concrete slab during fire. This study compares the fire design of a 9-story office building using prescriptive and performance-based designs. The safety levels of the two designs are investigated and compared. It is shown that performance-based design can be used to achieve the required level of safety currently enforced in the U.S. prescriptive guidelines, while providing an opportunity for cost reduction in fire protection material. [less ▲]

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See detailDevelopment of inversion techniques in Asteroseismology
Buldgen, Gaël ULg

Doctoral thesis (2017)

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See detailFrom seed to vegetable and from vegetable to seed : constructing a right to existence
Hecquet, Corentin ULg

Conference (2017, September 12)

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See detailBuckling of steel plates at elevated temperatures: Theory of perfect plates vs finite element analysis
Maraveas, Chrysantos ULg; Gernay, Thomas ULg; Franssen, Jean-Marc ULg

in Proceedings of CONFAB'17 Conference (2017, September 11)

The local buckling capacity of fire exposed thin-walled steel cross sections is affected by the reduction in strength and stiffness due to elevated temperatures and the amplitude of the initial local ... [more ▼]

The local buckling capacity of fire exposed thin-walled steel cross sections is affected by the reduction in strength and stiffness due to elevated temperatures and the amplitude of the initial local imperfections. Several researchers have proposed design methods to calculate the capacity of the plates (i.e. web and flanges) that compose these steel members at elevated temperatures, but they used different shapes of steel plates (sides ratio a/b) and different amplitudes of local imperfections. This variability in hypotheses happens because there is no clear provision defining the numerical modeling procedure for fire design of steel plates in the codes (European or US). According to the theory of perfect plates, the critical load depends of the shape of the rectangular plate (e.g. the sides ratio a/b) and the corresponding buckling mode (number of half waves), the boundary and the loading conditions. This paper reviews the existing code provisions and compares the existing design models and their assumptions for thin-walled steel cross sections. Elements of the theory of perfect plates are presented. Parametric finite element analyses are then conducted on isolated steel plates at elevated temperatures to investigate the effect of the plate shape (a/b ratio) and imperfections (amplitude and number of half wave lengths). From the analysis, the governing parameter will be estimated (a/b vs imperfections) for simulation of isolated flanges and webs. Finally, recommendations for the numerical modeling of steel plates at elevated temperatures are proposed. [less ▲]

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See detailUsing IPCAPS to identify fine-scale population structure
Chaichoompu, Kridsadakorn ULg; Fentaw Abegaz, Yazew ULg; Tongsima, Sissades et al

Poster (2017, September 09)

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See detailComparative fire analysis of steel-concrete composite buildings designed following performance-based and U.S. prescriptive approaches
Elhami Khorasani, Negar; Fang, C.; Gernay, Thomas ULg

in Proceedings of the ASFE '17 Conference (2017, September 08)

Performance-based structural fire design provides a rational methodology for designing modern buildings with cost-effective solutions. However, in the United States, fire design still largely relies on ... [more ▼]

Performance-based structural fire design provides a rational methodology for designing modern buildings with cost-effective solutions. However, in the United States, fire design still largely relies on design at the component level using prescriptive approaches. With performance-based approaches, there is an opportunity to benefit from increased flexibility and reduced cost in the design, but these advantages need to be explicitly described and disseminated to promote this shift in paradigm. In this paper, a comparative analysis is conducted on multi-story steel-concrete buildings designed following performance-based and U.S. prescriptive approaches. The steel-concrete composite structure allows taking advantage of tensile membrane action in the slab during fire, and therefore removing the fire protection on secondary beam elements. The nonlinear finite element software SAFIR is used to model the behavior of the buildings under the standard ASTM fire and a natural fire determined using the two-zone fire model CFAST. The numerical simulations show that performance-based design can be used to achieve the required level of safety currently enforced in the U.S. prescriptive guidelines, while providing an opportunity for cost reduction in fire protection material. [less ▲]

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See detailA method for hybrid fire testing: Development, implementation and numerical application
Sauca, Ana ULg; Mergny, Elke ULg; Gernay, Thomas ULg et al

in Proceedings of ASFE'17 Conference (2017, September 08)

Hybrid Fire Testing (HFT) is a technique that allows assessing experimentally the fire performance of a structural element under real boundary conditions that capture the effect of the surrounding ... [more ▼]

Hybrid Fire Testing (HFT) is a technique that allows assessing experimentally the fire performance of a structural element under real boundary conditions that capture the effect of the surrounding structure. To enable HFT, there is a need for a method that is unconditionally stable, ensures equilibrium and compatibility at the interface and captures the global behaviour of the analysed structure. A few attempts at conducting HFT have been described in the literature, but it can be shown, based on the analytical study of a simple one degree-of-freedom elastic system, that the considered method was fundamentally unstable in certain configurations which depend on the relative stiffness between the two substructures, but which cannot be easily predicted in advance. In this paper, a new method is introduced to overcome the stability problem and it is shown through analytical developments and applicative examples that the stability of the new method does not depend on the stiffness ratio between the two substructures. The new method is applied in a virtual hybrid test on a 2D reinforced concrete beam part of a moment resisting frame, showing that stability, equilibrium and compatibility are ensured on the considered multiple degree-of-freedom system. Besides, the virtual HFT succeeds in reproducing the global behaviour of the analysed structure. The method development and implementation in a virtual (numerical) setting is described, the next step being its implementation in a real (laboratory) hybrid test. [less ▲]

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See detailAdaptive capacity assessment of damselfishes (Pomacentridae)
Gajdzik, Laura ULg

Doctoral thesis (2017)

Detailed reference viewed: 22 (4 ULg)
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See detailEffect of upgrading concrete strength class on fire performance of reinforced concrete columns
Gernay, Thomas ULg; Peric, Vlado; Mihaylov, Boyan ULg et al

in Proceedings of ASFE'17 Conference (2017, September 07)

High strength concrete (HSC) provides several advantages over normal strength concrete (NSC) and is being used in multi-story buildings for reducing the dimensions of the columns sections and increasing ... [more ▼]

High strength concrete (HSC) provides several advantages over normal strength concrete (NSC) and is being used in multi-story buildings for reducing the dimensions of the columns sections and increasing the net marketable area. However, upgrading of concrete strength class in a building may affect the fire performance, due to higher rates of strength loss with temperature and higher susceptibility to spalling of HSC compared with NSC. Reduction of columns sections also leads to increased member slenderness and faster temperature increase in the section core. These detrimental effects are well known, but their impact on fire performance of structures has not been established in terms of comparative advantage between NSC and HSC. In other words, it is not clear whether the consideration of fire resistance limits the opportunities for use of HSC for reducing the dimensions of columns sections in multi-story buildings. This research aims to address this question by comparing the fire behaviour of reinforced concrete columns made of NSC and HSC using nonlinear finite element modelling. The evolution of load bearing capacity of the columns is established as a function of the fire exposure duration. A 15-story car park structure is adopted as a case study with alternative designs for the columns based on strength classes ranging from C30 to C90. Results show that, although the replacement of NSC by HSC accelerates the reduction rate of columns capacity under fire, the columns generally have significant reserves in resistance leading to sufficient fire resistance. This study gives an insight into the impact of replacing stocky sections in NSC by more slender sections in HSC on fire resistance rating for multi-story structures. [less ▲]

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See detailRound table. Quaternary Prevention(P4) or first do not harm.
Jamoulle, Marc ULg; Ouvrard, Patrick; Widmer, Daniel et al

Conference (2017, September 07)

see pdf

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See detailMagneto-optical investigation of superconducting hybrid structures
Brisbois, Jérémy ULg

Doctoral thesis (2017)

Detailed reference viewed: 41 (6 ULg)
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See detailSensitivity of elevated temperature load carrying capacity of thin-walled steel members to local imperfections
Maraveas, Chrysantos ULg; Gernay, Thomas ULg; Franssen, Jean-Marc ULg

in Proceedings of ASFE'17 Conference (2017, September 07)

The local buckling capacity of fire exposed thin-walled steel cross sections is affected by the reduction in strength and stiffness due to elevated temperatures and by the amplitude of the initial local ... [more ▼]

The local buckling capacity of fire exposed thin-walled steel cross sections is affected by the reduction in strength and stiffness due to elevated temperatures and by the amplitude of the initial local imperfections. Several researchers have proposed design methods to calculate the capacity of these steel members at elevated temperatures, but they used different methodologies and different amplitude of local imperfections in the extensive numerical analyses that are typically at the base of these methods. This variability in hypotheses happens because there is no clear provision defining the local imperfection amplitude for fire design in the codes (European or US). EN 1993-1-5 proposes amplitude values of local imperfections for ambient temperature design, while EN 1090-2 defines a -different- maximum allowed size of fabrication tolerance during production. Meanwhile, other sizes of local imperfections have also been proposed in the literature, with values different than those from EN 1993-1-5 and EN 1090-2. This paper reviews the existing code provisions and compares the existing design models and their assumptions for thin-walled steel cross sections. Finite element analyses are then conducted on isolated steel plates at elevated temperatures to investigate the effect of local imperfections. Finally, specific amplitude of local imperfections is proposed for fire design of thin-walled steel members. [less ▲]

Detailed reference viewed: 35 (4 ULg)