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See detailLes insectes dans l'agriculture
Hatt, Séverin ULg; Francis, Frédéric ULg

Conference given outside the academic context (2015)

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See detailConcrete Surface Engineering
Courard, Luc ULg; Bissonnette, Benoît; Garbacz, Andrzej

Book published by CRC Press (2015)

The objective of the book is to provide better basic knowledge about concrete surface properties with regard to repair operations. When Long et al. (2001) were asking “Why assess the properties of near-to ... [more ▼]

The objective of the book is to provide better basic knowledge about concrete surface properties with regard to repair operations. When Long et al. (2001) were asking “Why assess the properties of near-to-surface concrete?,” they were referring to bond development, one of the most important research topics in the field of concrete repairs. Adjoining any material to an existing concrete surface intrinsically involves this interfacial issue. Surface engineering is an area of knowledge addressing all surface-related considerations, notably those pertaining to adhesion. It provides a fundamental understanding of what will make the contact effective or not, allowing for interactions of variable intensity between the materials. A variety of suitable scientific tools is available to characterize properties of layer, quality of substrate and adhesion of overlay to substrate. Many of the basics of surface engineering, which has long developed into a discipline in metallurgy, can in fact apply to the repair and surface treatment of concrete, with the main objective of achieving a desired durability. A fundamental approach is presented in this book and explained in connection with a variety of typical concrete repairs and surface treatments. This book is intended to become a leading-edge resource for practicing engineers, architects, repair specialists as well as researchers looking for: • scientific fundamental knowledge needed to understand how a concrete surface may act on adhesion of a variety of systems; • methods and techniques for analysing concrete surface characteristics; • rational means to evaluate advantages and disadvantages of the various surface preparation techniques; • recommendations to ensure satisfactory adherence of repair materials, coatings or injection products to concrete; • guidelines for selecting well adapted repair material and techniques. The authors’ expertise in the field of repair and maintenance of concrete is recognized internationally. They have been involved for many years in the work of related Rilem and ACI workgroups. This book is in fact the result of more than 15 years of collaborative research. [less ▲]

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See detailToward Concessions 2.0 in Central Africa Recognising and managing overlapping tenure rights
Karsenty, Alain; Vermeulen, Cédric ULg

Conference (2015, November 30)

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See detailLa COP21, c'est quoi ?
Ozer, Pierre ULg

Speech/Talk (2015)

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See detailLong-term study of methane and two of its derivatives from solar observations recorded at the Jungfraujoch station
Bader, Whitney ULg

Doctoral thesis (2015)

A long-term study of methane and two of its derivatives, i.e. ethane and methanol from ground-based FTIR solar observations recorded at the high alpine International Scientific Station of the Jungfraujoch ... [more ▼]

A long-term study of methane and two of its derivatives, i.e. ethane and methanol from ground-based FTIR solar observations recorded at the high alpine International Scientific Station of the Jungfraujoch (3580 m a.s.l.) is reported. Those three gases act as tropospheric ozone precursors through their removal pathway and therefore have an impact on air quality. In the stratosphere, methane influences the content of ozone and in the production of water vapor. Moreover, both methane and ethane impact the greenhouse radiative forcing. While the latter is an indirect greenhouse gas because of its sinks, the former is the second most important anthropogenic greenhouse gas after CO2. The primary challenge of this work is the development and optimization of retrieval strategies for the three studied gases from FTIR spectra recorded at the Jungfraujoch station, in the framework of the Network for Detection of Atmospheric Composition Change (NDACC), in order to assess their concentrations in the atmosphere and to study their long-term trend and recent changes as well as their seasonal variations. The development and optimization of a retrieval strategy, based on the selection of the best combination of parameters, aims to limit interferences, minimize residuals, and maximize information content. To this end, the best retrieval strategy has been selected from a great number of available combinations thanks to a method for error analysis developed through this work. A 17-year time series of methanol is presented thanks to the combination of spectral windows for the first time for ground-based observations resulting in the improvement of the information content. We therefore present the first long-term time series of methanol total, lower tropospheric and upper tropospheric–lower stratospheric partial columns. We found no significant long-term trend of methanol but its seasonal cycle shows a high peak-to-peak amplitude of ̴103 % for total columns characterized by minimum values in winter and maximum values during summertime. The presented time series provides a valuable tool for model and satellite validation and complement the few NDACC measurements at northern mid-latitudes. Regarding ethane, we have for the first time included a combination of improved spectroscopic parameters as well as an improved a priori state that substantially reduce fitting residuals and enhance information content. Analysis of the long-term trend of ethane covering 20 years of observations revealed a strong positive trend of ethane from 2009 onwards of ̴5 %/year. We hypothesize that this recent ethane upturn may be the result of a large increase in fugitive emissions from the massive exploitation of shale gas and tight oil reservoirs on the North American continent. Finally, we quantified the changes of methane since 2005 from 10 ground-based NDACC sites, with a mean global increase of 0.30 %/year. Investigations into the source(s) responsible for this re-increase are performed with a GEOS-Chem tagged simulation that provides the contribution of each emission source and one sink to the total methane simulated. From the analysis of the GEOS-Chem tracers on both the local and global scales, we determined that the increasing anthropogenic emissions such as coal mining, gas and oil transport and exploitation, have played a major role in the increase of atmospheric methane observed since 2005 while they are secondary contributors to the total methane budget. [less ▲]

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See detailNeurophysiologie du rêve et régulation des émotions
Desseilles, Martin ULg

Scientific conference (2015, November 30)

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See detailLarge neighborhood search for multi-trip vehicle routing
François, Véronique ULg; Arda, Yasemin ULg; Crama, Yves ULg et al

E-print/Working paper (2015)

We consider two large neighborhood search approaches for the multi-trip vehicle routing problem, where each vehicle can perform several routes during the working shift to serve a set of customers. The ... [more ▼]

We consider two large neighborhood search approaches for the multi-trip vehicle routing problem, where each vehicle can perform several routes during the working shift to serve a set of customers. The problem specifically arises when customers are close to each other and/or when the demands are large. A common approach in the literature consists in solving this problem by mixing vehicle routing heuristics with bin packing routines to assign routes to vehicles. We compare this approach with the use of specific operators designed to tackle the routing and the assignment aspects of the problem simultaneously. We provide several best known solutions for benchmark instances. At the end of the work, we give insights about the proposed algorithm configurations by analyzing the behavior of several method components. [less ▲]

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See detailInteractions between forests and youth in the Walloon Region (Belgium)
Lhoest, Simon ULg

Conference given outside the academic context (2015)

Description of main types of forests in the Walloon Region, roles of youth and its interaction with forest management in Wallonia, links between forest management and environmental stakes as climate ... [more ▼]

Description of main types of forests in the Walloon Region, roles of youth and its interaction with forest management in Wallonia, links between forest management and environmental stakes as climate change and biodiversity erosion, importance of the involvement of population in forest resources protection. [less ▲]

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See detailPolyphosphosphoesters for the design of organic and inorganic drug delivery systems
Ergül, Zeynep ULg

Doctoral thesis (2015)

Polymers with repeating phosphoester linkages in the backbone are biodegradable and emerged as a promising class of novel biomaterials, especially in the field of drug delivery systems. The pentavalency ... [more ▼]

Polymers with repeating phosphoester linkages in the backbone are biodegradable and emerged as a promising class of novel biomaterials, especially in the field of drug delivery systems. The pentavalency of the phosphorus atom offers a large diversity of structures and as a consequence a wide range of properties for these materials. The thesis focused on the synthesis of novel well-defined diblock copolymers made of one hydrophilic polyethylene oxide (PEO) block and one polyphosphotriester (PPE) block bearing unsaturations as side-group, as a platform for the design of advanced drug delivery systems. Firstly, novel alkenyl PEO-b-PPE amphiphilic copolymers were self-assembled in water, taking profit of the unsaturations to prepare core cross-linked micelles. Doxorubicin could be successfully loaded by impregnation in these micellar nanocarriers leading to improved stability and loading as compared to the corresponding non-cross-linked systems. Besides, the alkynyl and allyl unsaturations of PEO-b-PPE copolymers were used to prepare novel double hydrophilic block copolymers exhibiting calcium complexation capabilities. They were found quite efficient as template for the formation of calcium carbonate particles providing particles of unprecedented small size, and high size homogeneity. The use of a supercritical carbon dioxide process with carboxylic acid containing copolymers allows reaching CaCO3 particles about 1.5 µm. Finally, we demonstrate that adding lysozyme to the process allows encapsulation of this enzyme into the CaCO3 carriers, the protein activity being better preserved by using the PPE-b-PEO as compared to more conventional hyaluronic acid as a template. [less ▲]

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See detailVouloir vivre malgré le terrorisme
Thoreau, François ULg

Article for general public (2015)

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See detailLipid metabolism in tumorigenesis and adaptation to cancer therapy
Sounni, Nor Eddine ULg

Conference (2015, November 27)

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See detailHypogonadisme Hypogonadotrope: sémiologie, physiopathologie, avancées génétiques et prises en charge
VALDES SOCIN, Hernan Gonzalo ULg

Scientific conference (2015, November 27)

Le contrôle neuroendocrinien de la reproduction chez les mammifères est régi par un réseau de neurones hypothalamiques d'environ 1500 neurones à GnRH, qui modulent l’activité de l'axe de la reproduction ... [more ▼]

Le contrôle neuroendocrinien de la reproduction chez les mammifères est régi par un réseau de neurones hypothalamiques d'environ 1500 neurones à GnRH, qui modulent l’activité de l'axe de la reproduction au cours de la vie. Plus récemment on a décrit une modulation du générateur à GnrH par des neurones à GnIH, kisspeptines et neurokinin B. L'hypogonadisme hypogonadotrope se décline en acquis (post traumatisme cranien ou TBI, post radiothérapie, associé à des maladies métaboliques ou inflammatoires, etc) et hypogonadisme hypogonadotrope congénital (HHC). Le HHC est un syndrome clinique qui est caractérisé par une insuffisance pubertaire partielle ou complète. Le HH congénital peut résulter d'une insuffisance hypothalamique de la sécrétion/action du GnRH ou d'une insuffisance de sécrétion/effets des gonadotrophines hypophysaires LH et FSH. Chez l'homme, plusieurs gènes qui participent à l'olfaction et à la migration neuronale de GnRH interagissent pendant l’embryogénèse et le développement fœtal. Un nombre grandissant de mutations de ces gènes est responsable de l’ HH congénital. Basé sur la présence ou l'absence de troubles de l'olfaction, le HH est divisé en deux syndromes : HH avec anosmie/hyposmie (le syndrome de Kallmann) et l’ hypogonadisme hypogonadotrophique normosmique isolé (HHnI). Le syndrome de Kallmann (KS) est une maladie hétérogène qui affecte 1 personne sur 5000, avec 3 à 5 fois plus d’hommes que de femmes. Le KS est associé à des mutations de gènes qui sont principalement liées à des défauts de la migration neuronale. Ces défauts reproductifs et olfactifs comprennent un phénotype variable, y compris une surdité neurosensorielle, un colobome, des syncinéties controlatérales bimanuelles, des malformations crâniofaciales et une agénésie rénale. Fait intéressant, les mutations invalidantes de certains gènes responsables du KS : PROKR2, FGFR1, FGF8, CHD7, DUSP6 et WDR11, sont également associées à un hypogonadisme IHH normosmique, tandis que des mutations KISS1/KISSR, TAC3/TACR3, GNRH1/GNRHR, LEP/LEPR, HESX1, βFSH et βLH (syndrome de Pasqualini) ne sont présentes que chez les patients atteints de IHH normosmique. Dans ce cours interuniversitaire Ulg-UlB, nous exposons les aspects cliniques , physiopathologiques, les avancées génétiques et la prise en charge de l'hypogonadisme hypogonadotrope en pathologie humaine. [less ▲]

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See detailSaint Paul 3D - Acquisition tridimensionnelle de la cathédrale via LaserScan
Hallot, Pierre ULg

in Journée d'étude organisée par l'Institut du Patrimoine Wallon et le Comité Patrimoine et Histoire de la FABI (2015, November 27)

Les nouvelles techniques LiDAR (Light Detection and Ranging) et photogrammétriques permettent d’acquérir rapidement un volume important de données 3D. Le terme LiDAR désigne tout instrument de mesure ... [more ▼]

Les nouvelles techniques LiDAR (Light Detection and Ranging) et photogrammétriques permettent d’acquérir rapidement un volume important de données 3D. Le terme LiDAR désigne tout instrument de mesure (terrestre, aéroporté) basé sur l’analyse des propriétés d’un faisceau renvoyé vers un émetteur (Poux et al. 2014). Conscient de l’énorme potentiel de ces techniques, l’Unité de Géomatique de l’Université de Liège a réalisé la numérisation de la Cathédrale Saint‐Paul de Liège. Ce projet a été initié via une collaboration avec le Matthieu Piavaux (FUNDP) et financée par le FNRS. Au‐delà des aspects de conservation et d’analyse du bâti, cette numérisation nous a permis de mettre en lumière les principes et limitations de la technique même d’acquisition de données 3D via LiDAR ainsi que ses limitations tant matérielles (sur terrain) que logicielles (traitement des données). Le jeu de donnée obtenu de la numérisation sert également de base fondamentale à un ensemble de projets de recherches (notamment via la réalisation de thèses de doctorats) visant à la segmentation automatique de nuages de points, de reconstruction d’objets tridimensionnelles, d’analyse de qualité d’ajustements. Par la suite, nous détaillons la méthodologie utilisée pour l’acquisition du nuage de points 3D ainsi que les différents principes de calage de nuages. Le chapitre suivant sera consacré à la présentation de résultats ainsi que de premiers développements en termes de segmentation automatique. Finalement, nous dresserons quelques perspectives de représentations. [less ▲]

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See detailLe rôle de la quantification dans le développement des sciences historiques
Geerkens, Eric ULg

Scientific conference (2015, November 27)

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See detailLe point sur les techniques de levé
Billen, Roland ULg

Scientific conference (2015, November 27)

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See detailLes infections utérines chez la vache : quels diagnostics pour quels traitements ?
Hanzen, Christian ULg

Conference given outside the academic context (2015)

Le cadre propédeutique et donc diagnostique et thérapeutique des infections utérines fait encore débat. Cependant, on peut de plus en plus faire état d’une harmonisation en ces domaines. Elle concerne les ... [more ▼]

Le cadre propédeutique et donc diagnostique et thérapeutique des infections utérines fait encore débat. Cependant, on peut de plus en plus faire état d’une harmonisation en ces domaines. Elle concerne les critères pour définir de manière aussi précise que possible les 4 types d’infections utérines. Elle concerne également la validation des méthodes de diagnostic. L’antibiorésistance est une réalité. Des mesures pour la réduire sont de plus en plus mises en place. Les praticiens doivent savoir faire un choix de plus en plus raisonné des stratégies thérapeutiques possibles pour limiter les conséquences économiques des infections utérines estimées en 2009 à 1,4 milliards d’Euros. Au terme de la formation, l’apprenant sera capable de… - définir les 4 types d’infections utérines décrites chez la vache - d’en expliquer brièvement la pathogénie - faire le choix propédeutique optimal pour en faire le diagnostic - d’en comprendre les avantages et inconvénients - adapter la stratégie thérapeutique qu’elle soit de nature hormonale ou anti-infectieuse, adaptée à la situation clinique de l’animal [less ▲]

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