References of "Léonard, Angélique"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailEnvironmental impact of photovoltaic power by Life Cycle Assessment
Gerbinet, Saïcha ULg; Belboom, Sandra ULg; Léonard, Angélique ULg

in Conference Proccedings - Volume 1 : Academic Papers (2011, November 03)

Detailed reference viewed: 42 (11 ULg)
Full Text
See detailEnvironmental performance of waste management through years using Life Cycle Assessment
Belboom, Sandra ULg; Renzoni, Roberto ULg; Digneffe, Jean-Marc et al

Conference (2011, November 03)

Detailed reference viewed: 30 (10 ULg)
Full Text
Peer Reviewed
See detailWEEE management using LCA methodology : the fridge case study
Belboom, Sandra ULg; Renzoni, Roberto ULg; Deleu, Xavier et al

in Conference Proccedings - Volume 1 : Academic Papers (2011, November)

Detailed reference viewed: 30 (9 ULg)
Full Text
Peer Reviewed
See detailStudy of Conduction Mechanisms in Antistatic Felts at the Mesoscopic Scale
Boutaayamou, Mohamed ULg; Léonard, Angélique ULg; Vanderheyden, Benoît ULg et al

in International Symposium on New Frontiers in Fiber Materials Science; Conference Proceedings (2011, October 11)

This work is part of a project that deals with the optimization of the quantity and the nature of conductive fibers in antistatic felts used for filtering and sieving powders. Our research concerns the ... [more ▼]

This work is part of a project that deals with the optimization of the quantity and the nature of conductive fibers in antistatic felts used for filtering and sieving powders. Our research concerns the electrical properties at the mesoscopic scale. It aims at determining the conduction mechanisms and the distribution of the electric potential at the scale of the distance between the conductive fibers. In this paper, current-voltage (I-V) measurement results are presented and discussed. X-ray microtomography is used to obtain the geometry of the conductive fibers inside the felts before and after these I-V tests. The studied textile material is based on polyester fibers and stainless steel conductive fibers. [less ▲]

Detailed reference viewed: 57 (27 ULg)
Full Text
See detailMicrostructure characterisation of nanocomposite polymeric foams by X-ray microtomography
Plougonven, Erwan ULg; Marchot, Pierre ULg; Detrembleur, Christophe ULg et al

Poster (2011, September 21)

Recent advances in microstructured materials have given rise to many new types of composites that exhibit original and interesting physical properties. For example, a nanocomposite made of carbon ... [more ▼]

Recent advances in microstructured materials have given rise to many new types of composites that exhibit original and interesting physical properties. For example, a nanocomposite made of carbon nanotubes inside a polymer matrix shows exceptional electromagnetic interference shielding effectiveness when foamed. However, the effective properties of such materials strongly depend on the shape and topology of the microstructural cells. An accurate method for investigating the cellular microstructure is X-ray microtomography (XRµT), for it is non-destructive, and it provides 3D geometric information. Although it cannot be used to observe nanofiller dispersion, it has a strong potential for cell structure characterization. In order to reduce the need for trial and error for tailoring these materials, our objective is to characterize, using XRµT, two different types of foaming procedures, namely supercritical CO2 batch foaming and freeze drying. As the resolution is limited compared to cell size, we have developed a novel statistical method based on 3D autocorrelation to determine characteristic length and examine anisotropy. We present results for these two types of foams and show the limitations of this method. [less ▲]

Detailed reference viewed: 61 (13 ULg)
Full Text
Peer Reviewed
See detailImproving bioethanol production by increasing sugar beet crop yield
Belboom, Sandra ULg; Léonard, Angélique ULg

in CAB Reviews: Perspectives in Agriculture, Veterinary Science, Nutrition and Natural Resources (2011), 6(24), 1-10

This review presents a summary of published papers about the improvement of sugar beet yield and its transformation into bioethanol. After situating the current political and economic context of the sugar ... [more ▼]

This review presents a summary of published papers about the improvement of sugar beet yield and its transformation into bioethanol. After situating the current political and economic context of the sugar beet crop, influence of factors during the crop growth is studied. Main factor influencing the crop yield and, consequently the bioethanol yield is the weather variability. Others parameters as climate change, fertilizer and crop management are evocated and explained in further paragraphs. Irrigation takes also place in semi-arid countries and plays a role in the different results. After the overview of the crop growth conditions, the sugar beet transformation into bioethanol has been pointed out with the most energetic steps, the different available raw materials from sugar beet and the optimal parameters to get the highest possible yield in terms of bioethanol. To provide economics on bioenergy production, the goal is to obtain the highest yield available in terms of sugar beet, sugar and then bioethanol. Some savings can be made with energy reduction during the fermentation or distillation steps. A sole guideline to reach this goal is not available because of the variability of the parameters depending on the location and on the weather forecasts. [less ▲]

Detailed reference viewed: 96 (15 ULg)
Full Text
See detailImpact environnemental des procédés de valorisation des boues : revue des ACV réalisées
Belboom, Sandra ULg; Léonard, Angélique ULg

Conference given outside the academic context (2011)

Detailed reference viewed: 68 (16 ULg)
Full Text
See detailEfficacité énergétique des procédés de séchage de boues d'épuration
Léonard, Angélique ULg; Arlabosse, Patricia

Conference (2011, May 19)

Detailed reference viewed: 40 (7 ULg)
Full Text
See detailMethodology for the characterization of the microstructure of nanocomposite polymeric foams using X-ray microtomography
Plougonven, Erwan ULg; Marchot, Pierre ULg; Detrembleur, Christophe ULg et al

in Micro-CT User Meeting Abstract Book (2011, April 13)

Polymeric foams used in electromagnetic shielding applications are characterized using X-ray microtomography. These foams contain a conductive nanometric reinforcement, carbon nanotubes, but the scale of ... [more ▼]

Polymeric foams used in electromagnetic shielding applications are characterized using X-ray microtomography. These foams contain a conductive nanometric reinforcement, carbon nanotubes, but the scale of characterization described here is that of the microscopic cells. Although nanotube dispersion is important for the final properties of the material, the structure and distribution of the porosity also play a role in terms of dielectric constant and conductivity. Unfortunately, cell wall thinness and limited resolution of laboratory microtomographs makes poper cell identification difficult. Therefore we present a new statistical method based on the 3D autocorrelation function, that allows to some extent to measure mean cell size and structure anisotropy. [less ▲]

Detailed reference viewed: 95 (37 ULg)
Full Text
Peer Reviewed
See detailWEEE management using LCA methodology : the fridge case study
Belboom, Sandra ULg; Renzoni, Roberto ULg; Deleu, Xavier et al

Poster (2011, March 01)

This study is based on WEEE life cycle assessment and more particularly on treatment and valorization of fridges and freezers. Two scenarios were envisaged: situation before fridge collect and the Belgian ... [more ▼]

This study is based on WEEE life cycle assessment and more particularly on treatment and valorization of fridges and freezers. Two scenarios were envisaged: situation before fridge collect and the Belgian current situation where all national fridges are treated in Liège. Results of this study prove the importance of collecting and valorizing fridges especially for old fridges containing refrigerant banned by the Montreal Protocol. Recovery and incineration of the pollutants permit to reduce climate change and ozone depletion impacts. [less ▲]

Detailed reference viewed: 121 (10 ULg)
Full Text
Peer Reviewed
See detailWEEE management using LCA methodology : the fridge case study
Belboom, Sandra ULg; Renzoni, Roberto ULg; Deleu, Xavier et al

in SETAC Europe 17th LCA Case Studies Symposium : "Sustainable lifestyles", Budapest 28 February - 1 March 2011 (2011, March)

This study is based on WEEE life cycle assessment and more particularly on treatment and valorization of fridges and freezers. Two scenarios were envisaged: situation before fridge collect and the Belgian ... [more ▼]

This study is based on WEEE life cycle assessment and more particularly on treatment and valorization of fridges and freezers. Two scenarios were envisaged: situation before fridge collect and the Belgian current situation where all national fridges are treated in Liège. Results of this study prove the importance of collecting and valorizing fridges especially for old fridges containing refrigerant banned by the Montreal Protocol. Recovery and incineration of the pollutants permit to reduce climate change and ozone depletion impacts. [less ▲]

Detailed reference viewed: 28 (1 ULg)
Full Text
See detailANALYSING THE SOIL STRUCTURE UNDER DIFFERENT TILLAGE SYSTEMS USING X-RAY MICROTOMOGRAPHY AND PF CURVES
Beekkerk van Ruth, Jöran ULg; Degre, Aurore ULg; Aubinet, Marc ULg et al

Poster (2011, February 23)

Assessing soil structure is primordial when comparing tillage systems. Whilst most conventional techniques characterize global parameters, X-ray microtomography allows a characterization of the poral ... [more ▼]

Assessing soil structure is primordial when comparing tillage systems. Whilst most conventional techniques characterize global parameters, X-ray microtomography allows a characterization of the poral space at a µm-scale. These results, combined with data from pF curves, can form a solid basis in order to quantify soil physical fertility. Soil samples were taken from the organic topsoil on two Belgian experimental sites implementing both conventional tillage (CT, ploughing) and simplified tillage (ST, superficial works), without straw restitution: Gentinnes, Brabant Wallon (March 2010), and Gembloux, Namur (November 2010). On the Gentinnes site (Aba(b)1), CT and ST have been implemented since October 2005, with a beet/winter wheat rotation. On the Gembloux site (Aba(b)), CT and ST have been implemented since September 2008, with a winter wheat cultivation since end 2009. Tomography (10 samples for Gentinnes, 8 for Gembloux) and pF curves (10 samples for Gentinnes, 14 for Gembloux) were used for analysis. Pressure pans were used in order to obtain the pF curves on 100 cm³ undisturbed samples. Soil cores (3 cm diameter, 5 cm height) were scanned using a Skyscan-1172 µ-CT device. The conical beam, operating at 100 kV, produced images having a 17µm pixel size, using a 16-bit 1048×2000 pixels camera equipped with an aluminium filter. The raw images were then treated under Matlab® for binarization, using a thresholding loop to fit the measured and the calculated porosity of each sample (Beckers et al, 2011). The 2D binary images were then analyzed under Matlab® and Skyscan™ CT-analyzer. On the site of Gentinnes, pF analysis showed a greater available water content (between pF 4.2 and 2.5) for ST, and a greater efficient porosity (between saturation and pF 2.5) for CT. The differences in available water content, although not significant, were confirmed by site observation. Tomography analysis yielded the following: under ST, the pores are smaller and the anisotropy less developed. As for the poral connectivity, it was found greater in CT. On the site of Gembloux, however, no significant differences were found between the tillage systems concerning the pF curves. Tomography analysis showed smaller pores for simplified tillage, but the differences deduced by the tomographic analysis of the Gentinnes samples concerning connectivity and anisotropy were not found in this case. To conclude, from the results, the soil structure is found to differ between CT and ST. The pores tend to be smaller and less oriented in ST, whilst in CT pores are more connected. Soils undergoing a CT show a greater efficient porosity, whilst soils under ST display a greater available water content. However, these differences were mostly spotted on the Gentinnes site: in Gembloux, the differences between the samples were less marked. This could be due to the fact that the soil did not have time to differentiate yet (less than 3 years of tillage differentiation). More sampling is needed in any case before inferring general conclusions from these observations. A further analysis of the soil images, especially concerning pore orientation, will be done in order to fully exploit the tomography results. [less ▲]

Detailed reference viewed: 113 (30 ULg)
Full Text
Peer Reviewed
See detailA life cycle assessment of injectable drug primary packaging: comparing the traditional process in glass vials with the closed vial technology (polymer vials)
Belboom, Sandra ULg; Renzoni, Roberto ULg; Verjans, Benoît et al

in International Journal of Life Cycle Assessment (2011), 16(2), 159-167

This study compares environmental impacts of two primary packaging alternatives used for injectable drugs: the traditional method based on glass vials and the method developed by Aseptic Technologies ... [more ▼]

This study compares environmental impacts of two primary packaging alternatives used for injectable drugs: the traditional method based on glass vials and the method developed by Aseptic Technologies based on polymer vials. A critical review by an external LCA expert was made. [less ▲]

Detailed reference viewed: 56 (19 ULg)
Full Text
Peer Reviewed
See detailA non-linear homogeneous model for bone-like materials under compressive load.
Mengoni, Marlène ULg; Voide, Romain; Toye, Dominique ULg et al

in Nithiarasu, P.; Löhner, R.; van Loon, R. (Eds.) et al Conference Proceedings - 2nd International Conference on Computational & Mathematical Biomedical Engineering (2011)

Using morphological data provided by computed tomography, finite element (FE) models can be used to compute the mechanical response of bone and bone-like materials without describing the complex local ... [more ▼]

Using morphological data provided by computed tomography, finite element (FE) models can be used to compute the mechanical response of bone and bone-like materials without describing the complex local microarchitecture. A constitutive law is here developed and proposed for this purpose. It captures the non-linear structural behavior of bone-like materials through the use of fabric tensors. It also allows for irreversible strains using a plastic material model, allowing hardening of the yield parameters. These characteristics are expressed in a constitutive law based on the anisotropic continuum damage theory coupled with isotropic elastoplasticity in a finite strains framework. This law is implemented into Metafor, a non-linear FE software. Simulations of cylindrical samples undergoing stepwise compression are presented. [less ▲]

Detailed reference viewed: 77 (31 ULg)
Peer Reviewed
See detailBone regeneration using porous titanium particles vs. bovine hydroxyapatite: a sinus lift study in rabbits
LAMBERT, France ULg; LECLOUX, Geoffrey ULg; Léonard, Angélique ULg et al

Poster (2011)

Background: The use of porous titanium particles as space filling biomaterials for intraoral bone regeneration might be of interest because of both the mechanical stability and nonresorbable properties ... [more ▼]

Background: The use of porous titanium particles as space filling biomaterials for intraoral bone regeneration might be of interest because of both the mechanical stability and nonresorbable properties. Titanium particles were recently described for bone regeneration in sinus lifts and in the treatment of periimplantitis. Nevertheless, tissue integration and 3D bone regeneration with titanium particles were poorly explored in these previous reports. Aim: The first objective of this study was to qualitatively and quantitatively assess the bone formation process, particularly the long-term behavior and 3D volume stability of subsinusal bone regeneration, using titanium or bovine hydroxyapatite granules, in a rabbit model. The second objective was to evaluate the effect of the hydration of the BHA particles with a therapeutic concentration of doxycycline solution on the osteogenesis and biomaterial resorption. Methods: Rabbits underwent a double sinus lift procedure using one of three materials: grade 1 porous titanium particles (Ti), bovine hydroxyapatite (BHA) or chemically modified bovine hydroxyapatite (BHATTC). Animals were sacrificed after 1 week, 5 weeks or 6 months. Samples were analyzed using mCT and nondecalcified histology. Results: The materials used in each of the three groups allowed an optimal bone formation; bone quantities and densities were not statistically different between the three groups. At 6 months, more stable 3D volume stability was found with TI and BHATTC (P¼0.0033). At 5 weeks and 6 months, bone to material contact (BMC) corroborating osteoconduction was significantly higher with BHA and BHATTC than with Ti (P < 0.0001). Conclusions and clinical implications: Even though the studied biomaterials displayed different architectures, they are relevant candidates for sinus lift bone augmentation before dental implants because they allow adequate 3D stability and osteogenesis. However, to recommend the clinical use of Ti, both an observation on the drilling effects of Ti particles and clinical trials are needed. [less ▲]

Detailed reference viewed: 19 (0 ULg)