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See detailStudy of the Direct Borohydride Fuel Cell anode
Olu, Pierre-Yves ULg

Doctoral thesis (2015)

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See detailTraitements médicaux des tendinopathies
Kaux, Jean-François ULg

Conference (2015, October 29)

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See detailIn vitro and in vivo evaluation of an optimized fenofibrate lipid based solid dispersion produced by a PGSS process
Pestieau, Aude ULg; Lebrun, Sonia; Cahay, Bernard et al

Poster (2015, October 28)

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See detailIn vitro and in vivo evaluation of an optimized fenofibrate lipid based solid dispersion produced by a PGSS process
Pestieau, Aude ULg; Lebrun, Sonia; Cahay, Bernard et al

Conference (2015, October 28)

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See detailOptimalisation de la production d’énergie par des procédés biochimiques à partir de substrat d’origine tropicale : Application à la biomasse lignocellulosique du bananier représentée par le cultivar Williams Cavendish (Groupe Triploïde Musa AAA)
Kamdem, Irenée ULg

Doctoral thesis (2015)

In a context where the need to find sustainable alternatives to fossil energies are necessary, this thesis highlights the socio-economic, environmental and energy benefits that banana-producing countries ... [more ▼]

In a context where the need to find sustainable alternatives to fossil energies are necessary, this thesis highlights the socio-economic, environmental and energy benefits that banana-producing countries can draw from the energy conversion of the residual lignocellulosic biomass (BLC) of banana plant. It also highlights the molecular and elemental factors influencing the production of methane (CH4) through the anaerobic digestion (AD) of the banana lignocellulosic biomass (BLB). The experiments carried out for the thesis showed that this substrate of tropical origin requires pretreatment to improve its digestibility and to optimize the production of CH4. A developing country like Cameroon, that produces and exports dessert and cooking bananas, generates annually approximately 4.5 million tons of fresh untapped BLB. The potential biotransformation of this waste into bioethanol, biomethane and pellets, constitutes new opportunities that could provide an important source of income for both banana producers and the whole country. These benefits are related to theoretical studies which required experimental studies for its validation. By its chemical composition, BLB is energetically more adapted to the biochemical processes of transformation, and particularly to AD. Therefore AD was investigated on BLC of Williams Cavendish cultivar (WCLB), one of the most commercialized in Cameroon. The analysis of the cumulative production of biogas from each of the six morphological parts (MPs) that constitute this biomass (bulb, leaf sheaths, petioles–midribs, leaf blades, rachis stem, and floral stalk) showed that the leaf blades and the rachis stem achieved respectively the lowest and the highest production yields i.e. 98 and 162 mL CH4 g-1 dry matter (DM of MP). The biogas conversion efficiency of all the combined six MPs was 50% lower than the theoretical potential (based on the total carbon content).These results therefore justified the need to deconstruct this organic matter through pretreatment operation since the lignin appears as one of the main factors limiting the accession of enzymes to the fermentable substrates. Biochemical composition of the BLC from all the combined six MPs of WCLB were compared before and after two different physicochemical pretreatments selected for their socio-economical and techno-ecological advantages i.e. steam cracking (SC) and steam explosion (SE). These pretreatments were carried out at pilot-scale with different severity factors namely regarding temperature since SC was tested at 150 °C (SC150), 180 °C (SC180) and 210 °C (SC210), and SE was tested at 210 °C. The results suggest that SC180 and SC210 are the most lignin-destabilizing pretreatments. The enzymatic degradation of the solid fractions (SFs) and the liquid fractions (LFs) recovered after the pretreatments confirmed the presence of oligomers in the LFs and the improvement of the digestibility of SFs. This digestibility improvement was confirmed by a supplementary AD. Indeed the weighted cumulative production of methane from SF and LF during 135 days shows that the SC210 and SE improved the production of biomethane by 28% and 5% respectively. A simplified schematic model of mass distribution during AD of a complex fermentable organic matter such as WCLB was proposed. Along with the existing models, this schematic model will contribute to the predictive evolution of the initial biomass, the bacterial and archaebacterial biomass, the soluble organic metabolites (such as acetic acid), and the CH4 and CO2 biogas. Forecasts related to the installation and operation of a family sized anaerobic digester in Cameroon have a return on investment period of about 8.5 years (with an estimated life term of 25 years for the biodigester built in reinforced concrete). Moreover, the simulation of an integrated industrial production of biogas and bioethanol from 1 ton DM of WCLB subjected to SC210 showed that 284 L of ethanol would be produced from 800 kg DM of SF for a production cost of 85 €. This cost was calculated regardless of energy from the combustion of biogas produced during the AD of 200 kg DM of LF. Net income after tax for the integrated production was valued to 239 € t-1 DM WCLB. This study showed that BLB should now be taken into account within the energy recoverable BLC and that it is more adapted to the AD process. However, a better assessment of the energetic, socio-economical and environmental benefits that banana-producing countries can draw from the BLB, would require a pilot-scale investigation of the AD process where the bio-physico-chemical parameters prevailing in the industrial biodigesters can be reproduced. [less ▲]

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See detailLe rôle du droit électoral quant à l’accès au Parlement
Bouhon, Frédéric ULg

Scientific conference (2015, October 28)

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See detailFrom some obscurity to clarity in Boom clay behavior: Analysis of its coupled hydro-mechanical response in the presence of strain localization
Salehnia, Fatemeh ULg

Doctoral thesis (2015)

Deep disposal of the high-level and high-lived radioactive wastes in the potential geological formations is envisaged as a possible solution in the framework of long-term management of these wastes. The ... [more ▼]

Deep disposal of the high-level and high-lived radioactive wastes in the potential geological formations is envisaged as a possible solution in the framework of long-term management of these wastes. The argillaceous materials, namely Boom Clay, are potential to constitute the natural barrier aimed at confining the nuclear waste and protecting the biosphere from it. Around galleries excavated at depth in these media, the creation of a damaged zone with significant irreversible deformation is generally unavoidable. A considerable change in the host rock properties could be likely resulted in this zone, which may potentially be important with respect to the long-term evolution and the performance of the system. In this context, a paramount interest addresses characterization of the so-called Excavation Damaged Zone (EDZ), predicting its extent, and development of localized fracturing during and after the underground excavation in the host rock. This constitutes the foundation of this work, focusing on the Boom Clay formation as the reference potential host rock in Belgium. Dealing with this purpose, providing a state of knowledge on the hydro-mechanical behavior of Boom Clay, and validating a set of parameters which could realistically reproduce its response through the numerical modelings are firstly addressed as the requisites. Moreover, a special focus is made on the dilatation factor of the rock, commonly described through the dilatancy angle parameter. Correct estimation of the dilatant behavior of a rock has an essential role in a realistic simulation of its volumetric behavior, fracturing threshold during the rock deformation process and its post-failure response. Therefore, a new formula is developed for consideration of the variable dilatancy angle, incorporated into an internal frictional elasto-plastic hardening/softening model, within the LAGAMINE finite element code. This development overcomes the inconveniences associated to using a constant dilatancy angle, for instance encountered in our numerical simulations of some laboratory small-scale tests as well as a large-scale excavation. This study then focuses more particularly on simulation of EDZ extension at the large scale excavation, around the Connecting gallery (in the HADES URL, Mol, Belgium), through analyzing the evolution of strain localization in shear bands mode. The modeling takes into account of the initial anisotropic stresses, mechanical cross-anisotropy, anisotropic permeabilities, and gravity effects. As a result, an eye-shape extension of EDZ accompanied by an anisotropic convergence of the rock is predicted. A coupled analysis addresses the pore water pressure distribution during the excavation period and in long-term while no more evolution of the localized shear bands is predicted. To assess the reliability of the numerical results, some available in-situ measurements and observations, within the clay, during the gallery's construction and afterwards are precisely analyzed, and then compared with the corresponding numerical predictions. As a result, a good agreement is found between the in-situ data and simulated results. Moreover, the above study is integrated with a particular analysis of the contact mechanism on the interface between the clay and the gallery's lining. Thence, the coupled interface element is introduced to deal with the contact phenomenon. The obtained results reveal some interesting features regarding the development of contact pressure on the interface linked to the evolution pattern of strain localization within the clay around the gallery. Furthermore, with regard to the own lining behavior, a development of the modeling with the aim of consideration of a discontinuous lining (made of the segments as the real case) is performed. We propose an approach to realistically reproduce the response of the lining's segments and their contact phenomena in the course of a long-term simulation. Defining the interface elements between the neighboring segments, with respect to the real installation procedure of the lining during the gallery construction, this process is aimed to be simulated through some evolution of the contact pressure on the segments' interfaces. As a result, a considerable improvement is achieved in reproducing the in-situ measurements provided in the lining. The numerical and measured evolution of strain and displacement are in a good agreement. [less ▲]

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See detailComputing k-binomial equivalence and avoiding binomial repetitions
Rigo, Michel ULg

Conference (2015, October 28)

In this talk, I will first recall basic results on binomial coefficients of words, then review the connections and differences with Parikh matrices. As a generalization of abelian equivalence, two words u ... [more ▼]

In this talk, I will first recall basic results on binomial coefficients of words, then review the connections and differences with Parikh matrices. As a generalization of abelian equivalence, two words u and v are k-binomially equivalent if every word of length at most k appears as a subword of u exactly as many times as it appears as a subword of v. So a k-binomial square is a word uv where u and v are k-binomially equivalent. We will discuss avoidance of squares and cubes in infinite words (this is a joint word with M. Rao). Finally, I will consider the question of deciding whether or not two finite words are k-binomially equivalent. This problem has recently been shown to be decidable in polynomial time by Freydenberger, Gawrychowski et al. [less ▲]

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See detailMarks & Spencer: A Landmark Decision?
Richelle, Isabelle ULg

in Haslehner, Werner; Kofler, Georg; Rust, Alexander (Eds.) Landmark Decisions of the ECJ in Direct Taxation (2015)

Every professional dealing with taxation in the European Union will greatly appreciate this extraordinarily useful book. Based on a high-level conference held at the University of Luxembourg in 2014, the ... [more ▼]

Every professional dealing with taxation in the European Union will greatly appreciate this extraordinarily useful book. Based on a high-level conference held at the University of Luxembourg in 2014, the book presents detailed expert summaries and analyses of landmark ECJ decisions in direct taxation, each case a starting point for the development of a specific doctrine. The depth of the analysis, as each author charts a way through the nuances of the Court’s arguments, allows the reader to gain an unparalleled understanding of changes in the relevant subsequent jurisprudence. [less ▲]

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See detailMort Cellulaire et Développement chez Streptomyces coelicolor
Tenconi, Elodie ULg

Doctoral thesis (2015)

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See detailWhat is Quaternary prevention ?
Jamoulle, Marc ULg

Conference (2015, October 27)

Principle of quaternary prevention

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See detailPourquoi l'écriture importe
Pieron, Julien ULg

Conference (2015, October 27)

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See detailLes exigences de la « terrestrialité »: une épreuve pour l’enquête
Thoreau, François ULg

Conference (2015, October 27)

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See detailA prospective 4 year study of the objective and subjective outcomes of 15 patients after dynamic facial reanimation surgery.
ANDREWS, Peter J; RANDHAWA, Premjit S; JOSEPH, Jonathan et al

in Clinical Otolaryngology (2015)

Facial nerve palsy is a debilitating and life changing event which significantly affects quality of life. This prospective study evaluates outcomes in 15 patients undergoing dynamic facial reanimation ... [more ▼]

Facial nerve palsy is a debilitating and life changing event which significantly affects quality of life. This prospective study evaluates outcomes in 15 patients undergoing dynamic facial reanimation surgery using a modification of the minimally invasive temporalis tendon transposition technique (MIT3) coupled with either static reanimation techniques or synergistic inter-positional/facial-hypoglossal nerve reconstruction techniques. All patients demonstrated significant improvement both objectively and subjectively as measured by the SMILE system and FaCE scale respectively. The MIT3 technique can be used successfully for dynamic reanimation and allows for other techniques to be simultaneously tailored around it. It provides improved functional and quality of life outcomes in patients and affords low morbidity. [less ▲]

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See detailAspects malacologiques du cycle de Fasciola hepatica en Belgique et en Equateur
Caron, Yannick ULg

Doctoral thesis (2015)

Fasciolosis is a zoonotic disease of ruminants and other herbivorous due to two parasite species of the genus Fasciola. If Fasciola gigantica is a tropical species, F. hepatica has a much wider geographic ... [more ▼]

Fasciolosis is a zoonotic disease of ruminants and other herbivorous due to two parasite species of the genus Fasciola. If Fasciola gigantica is a tropical species, F. hepatica has a much wider geographic distribution. Fasciola hepatica is responsible for important economic losses such as a marked reduction of milk yield and liver condemnation at the slaughterhouse. The life cycle of this platyhelminth involves an intermediate host, a gastropod mollusc belonging to the Lymnaeidae family. In temperate Europe, Galba truncatula acts as the main intermediate host of F. hepatica. A wide network project called MANSCAPE allowed the implementation of a sampling campaign conducted in more than 125 ponds throughout Belgium which revealed that other lymnaeid snails (belonging to the genus Radix) could act as secondary or alternative intermediate hosts. Some experimental infections of snails and rats permited to study the host-parasite relationships in some of these species (Radix balthica, R. labiata). Sibling species very similar to « R. peregra » seem to contain several potential candidates. Several techniques are available to detect the parasite in the snail: they are based either on microscopy or on molecular biology. A very sensitive (100 pg parasite DNA still detectable) and specific technique based on molecular biology (Multiplex PCR) was developed. This technique was used qualitatively and quantitatively to determine the intermediate host species involved in the life cycle of the liver fluke in Belgium. This study was performed in the frame of the PONDSCAPE project and prevalences of 1.31% (30/2747) and 0.16% (7/4629) were recorded for G. truncatula and R. balthica respectively. This technique was then used in Ecuador to bring some information on the intermediate host species involved in the life cycle of F. hepatica. Galba schirazensis, an invasive species in South America, was identified as a lymnaeid that could harbour a part of the life cycle of the parasite as 8.15% (86/1055) of the collected snail contained parasite DNA and 2.46% (26/1055) living larvae. These studies showed that R. balthica could have an impact on the epidemiology of F. hepatica in Belgium and that the role of G. schirazensis in Ecuador needs to be clarified. This will be discussed in this work and specially in term of co-evoultion and adpatation way. [less ▲]

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See detailReceiver operating characteristic (ROC) curves and their use in psychometric simulation studies
Magis, David ULg

Scientific conference (2015, October 27)

Simulation studies are commonly used in psychometric research to compare existing methods or to highlight the outperformance of a newly developed approach with respect to standard techniques. In several ... [more ▼]

Simulation studies are commonly used in psychometric research to compare existing methods or to highlight the outperformance of a newly developed approach with respect to standard techniques. In several specific situations, the output of performance evaluations can be summarized by pairs of statistics such as false alarm and hit rates (or Type I error and power). Adequate analysis of these rates, however, is often subject to discussion. The purpose of this ongoing work (jointly with Francis Tuerlinckx) is to advocate the usefulness of receiver operating characteristic (ROC) curves to analyze the output of simulation studies in terms of pairs of summary statistics. Two particular psychometric applications will be considered and illustrated: differential item functioning (DIF) and person fit identification. By means of simple examples, ROC curves will be shown to be efficient in capturing more output than standard analyses, thus allowing for a more refined and precise discussion of the study results. Limitations and other extensions will also be outlined. [less ▲]

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See detailAxe 3 : Démarche qualité
Adam, Stéphane; Missotten, Pierre ULg

Conference given outside the academic context (2015)

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See detailEnquête, SF, politique. Comment nous avons croisé Haraway
Pieron, Julien ULg

Conference (2015, October 26)

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