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See detailRELATIONS ENTRE GAIN BARO-REFLEXE ET STRESS PULSATILE CHEZ LE PATIENT DIABETIQUE DE TYPE 1
SCHEEN, André ULg; MARCHAND, Monique ULg; PHILIPS, Jean-Christophe ULg

in Archives des Maladies du Coeur et des Vaisseaux (2011), hors série 3

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See detail"Exposer, explorer, exploser. Canon et cinéma de found footage"
Belloi, Livio ULg

in Bianchi, Pietro et al. (Ed.) "Il Canone cinematografico" (2011)

Cet article examine les relations diversifiées qui peuvent se nouer entre canon cinématographique, film orphelin et cinéma de found footage. Pour ce faire, il s'appuie sur un échantillon (dans tous les ... [more ▼]

Cet article examine les relations diversifiées qui peuvent se nouer entre canon cinématographique, film orphelin et cinéma de found footage. Pour ce faire, il s'appuie sur un échantillon (dans tous les sens du terme) du deuxième volet de "Film ist." (Gustav Deutsch, 2002), qui s'offre comme une parabole sur l'acte de regarder. [less ▲]

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See detailOptimisation du procédé de captage de CO2 dans des solvants aminés
Léonard, Grégoire ULg; Heyen, Georges ULg

in Récents Progrès en Génie des Procédés (2011), 101

Post-combustion carbon capture in amine solvents is currently one of the most promising technologies to prevent large quantities of CO2 from being emitted into the atmosphere. Two models (equilibrium and ... [more ▼]

Post-combustion carbon capture in amine solvents is currently one of the most promising technologies to prevent large quantities of CO2 from being emitted into the atmosphere. Two models (equilibrium and kinetics) have been built using the Aspen Plus software in order to optimise the capture process. A sensitivity study at constant CO2 capture rate has shown that the solvent concentration, its flow rate and its regenerating pressure have the largest influence on the process energy requirement. Different process flowsheet modifications such as the lean vapor compression, an absorber inter-cooling and the split-flow configuration have been simulated as well, decreasing the energy cost of the process. Tests on a pilot installation will be made that will help to validate this model. [less ▲]

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See detailA new tool to control meat products safety: a web based application of predictive microbiology models
Delhalle, Laurent ULg; Adolphe, Ysabelle ULg; Crevecoeur, Sébastien ULg et al

Conference (2011)

Predictive microbiology is considered by the European legislation as a tool to control food safety. Meat and meat products are particularly sensitive to contamination with pathogens. However, development ... [more ▼]

Predictive microbiology is considered by the European legislation as a tool to control food safety. Meat and meat products are particularly sensitive to contamination with pathogens. However, development of predictive microbiology models and interpretation of results require specific knowledge. A free web based model has been developed for an easy use by people who are not experts in this field as industries and public authorities. The model can simulate the growth of Salmonella spp, Listeria monocytogenes and Escherichia coli O157 in minced pork meat and on pork meat product (white pudding) under different environmental conditions. The model provides simulations under static or dynamic conditions over time. The user also has the opportunity to import the specific growth rate and cardinal parameters of a bacterium. Unlike polynomial models currently available, this free web access model is distinguished by the use of secondary square roots and primary logistic model with delay. This model permits to have a real time process management, to prospect new formulation for safer products or to design safer processes, to estimate the shelf life of a food product, etc [less ▲]

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See detailOccurrence de la coccinelle asiatique (Harmonia axyridis Pallas), espèce invasive, dans les agro-habitats en 2009
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

in Entomologie Faunistique = Faunistic Entomology (2010), 63(4), 251-258

La lutte contre les pucerons de manière biologique consiste entre autre à utiliser des insectes prédateurs de pucerons tels que les coccinelles. En Belgique un des auxiliaires le plus utilisé est la ... [more ▼]

La lutte contre les pucerons de manière biologique consiste entre autre à utiliser des insectes prédateurs de pucerons tels que les coccinelles. En Belgique un des auxiliaires le plus utilisé est la coccinelle à deux points (Adalia bipunctata) mais en 1997, les horticulteurs ont introduit la coccinelle asiatique (Harmonia axyridis) afin de lutter plus efficacement contre les pucerons. Cette coccinelle invasive s'est rapidement répandue dans toute la Belgique et à travers l'Europe. Afin d'évaluer son impact sur l'entomofaune des milieux agricoles, nous avons réalisé un inventaire des aphidiphages présent sur 10 sites réparti en Wallonie. Deux méthodes d'échantillonnage ont été utilisées: (1) l'utilisation de pièges collant et (2) l'observation visuelle dans des quadras d'1m². Après 10 semaines d'inventaire, nous pouvons conclure que pour l'année 2009, la coccinelle asiatique est la coccinelle la plus abondante dans les agro-écosystèmes wallons. Les cultures préférentielles dans lesquelles la coccinelle invasive a été la plus abondante sont la pomme de terre biologique et le maïs. Culture où la quantité de puceron n'est pas forcement la plus élevée. La période de reproduction de la coccinelle asiatique se situe à la mi-juillet, période d'abondance de proies dans les cultures étudiées. [less ▲]

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See detailAssister n’est pas assurer Les enjeux d’une mutation anthropologique au cœur des politiques sociales
Vrancken, Didier ULg

in SociologieS (2010)

Dans une récente réédition de l’un de ses ouvrages, Michel Messu revient sur l’enquête qu’il avait menée au cours des années 1980 auprès des assistés sociaux et prolonge son analyse par une réflexion ... [more ▼]

Dans une récente réédition de l’un de ses ouvrages, Michel Messu revient sur l’enquête qu’il avait menée au cours des années 1980 auprès des assistés sociaux et prolonge son analyse par une réflexion originale sur les évolutions de la protection sociale actuellement en cours dans la France du XXIe siècle, que l’on pourrait résumer ainsi : la protection sociale se présenterait désormais sous le visage d’une d’assurance d’assistance, garantissant à chaque citoyen une protection qu’il recevra tantôt sous forme d’assurance, tantôt sous forme d’assistance, souvent dans une combinatoire des deux. Cette thèse permet d’insister sur les glissements de registre, voire de régime, d’une protection sociale devenant de plus en plus une protection par intervention sur autrui. Mais, pour l’auteur, elle semble néanmoins pécher par un excès de banalisation du phénomène. S’appuyant sur ses propres analyses, celui-ci propose une vision assez différente de la protection afin d’alimenter le débat [less ▲]

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See detailLa société singulariste ou les défis pour une voie moyenne de la sociologie
Vrancken, Didier ULg

in SociologieS (2010)

Cet article propose de discuter les thèses développées par Danilo Martuccelli dans son ouvrage "La Société singulariste", Paris, Éditions Armand Colin, coll. Individu et société, 2010

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See detailEffets du réchauffement global sur les variables climatiques et hydrologiques au Bénin: Analyse de l’année 2010 par rapport aux données historiques
Ozer, Pierre ULg; Afouda, Abel; Hountondji, Yvon ULg et al

Scientific conference (2010, December 22)

Le Bénin a été affecté par des inondations de grande ampleur durant l'hivernage 2010, affectant plus de 350 000 personnes, causant près de 100 000 sans-abri et tuant à 43 reprises. L'objectif de cette ... [more ▼]

Le Bénin a été affecté par des inondations de grande ampleur durant l'hivernage 2010, affectant plus de 350 000 personnes, causant près de 100 000 sans-abri et tuant à 43 reprises. L'objectif de cette recherche est de voir si ces inondations revêtent un caractère exceptionnel ou non du point de vue de l'aléa. Pour ce faire, nous caractérisons les précipitations du réseau synoptique du Bénin sur la période 1940-2009 à partir de différents indices et analysons ensuite l'année 2010. [...] [less ▲]

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See detailSupervised Learning for Sequential and Uncertain Decision Making Problems - Application to Short-Term Electric Power Generation Scheduling
Cornélusse, Bertrand ULg

Doctoral thesis (2010)

Our work is driven by a class of practical problems of sequential decision making in the context of electric power generation under uncertainties. These problems are usually treated as receding horizon ... [more ▼]

Our work is driven by a class of practical problems of sequential decision making in the context of electric power generation under uncertainties. These problems are usually treated as receding horizon deterministic optimization problems, and/or as scenario-based stochastic programs. Stochastic programming allows to compute a first stage decision that is hedged against the possible futures and -- if a possibility of recourse exists -- this decision can then be particularized to possible future scenarios thanks to the information gathered until the recourse opportunity. Although many decomposition techniques exist, stochastic programming is currently not tractable in the context of day-ahead electric power generation and furthermore does not provide an explicit recourse strategy. The latter observation also makes this approach cumbersome when one wants to evaluate its value on independent scenarios. We propose a supervised learning methodology to learn an explicit recourse strategy for a given generation schedule, from optimal adjustments of the system under simulated perturbed conditions. This methodology may thus be complementary to a stochastic programming based approach. With respect to a receding horizon optimization, it has the advantages of transferring the heavy computation offline, while providing the ability to quickly infer decisions during online exploitation of the generation system. Furthermore the learned strategy can be validated offline on an independent set of scenarios. On a realistic instance of the intra-day electricity generation rescheduling problem, we explain how to generate disturbance scenarios, how to compute adjusted schedules, how to formulate the supervised learning problem to obtain a recourse strategy, how to restore feasibility of the predicted adjustments and how to evaluate the recourse strategy on independent scenarios. We analyze different settings, namely either to predict the detailed adjustment of all the generation units, or to predict more qualitative variables that allow to speed up the adjustment computation procedure by facilitating the ``classical'' optimization problem. Our approach is intrinsically scalable to large-scale generation management problems, and may in principle handle all kinds of uncertainties and practical constraints. Our results show the feasibility of the approach and are also promising in terms of economic efficiency of the resulting strategies. The solutions of the optimization problem of generation (re)scheduling must satisfy many constraints. However, a classical learning algorithm that is (by nature) unaware of the constraints the data is subject to may indeed successfully capture the sensitivity of the solution to the model parameters. This has nevertheless raised our attention on one particular aspect of the relation between machine learning algorithms and optimization algorithms. When we apply a supervised learning algorithm to search in a hypothesis space based on data that satisfies a known set of constraints, can we guarantee that the hypothesis that we select will make predictions that satisfy the constraints? Can we at least benefit from our knowledge of the constraints to eliminate some hypotheses while learning and thus hope that the selected hypothesis has a better generalization error? In the second part of this thesis, where we try to answer these questions, we propose a generic extension of tree-based ensemble methods that allows incorporating incomplete data but also prior knowledge about the problem. The framework is based on a convex optimization problem allowing to regularize a tree-based ensemble model by adjusting either (or both) the labels attached to the leaves of an ensemble of regression trees or the outputs of the observations of the training sample. It allows to incorporate weak additional information in the form of partial information about output labels (like in censored data or semi-supervised learning) or -- more generally -- to cope with observations of varying degree of precision, or strong priors in the form of structural knowledge about the sought model. In addition to enhancing the precision by exploiting information that cannot be used by classical supervised learning algorithms, the proposed approach may be used to produce models which naturally comply with feasibility constraints that must be satisfied in many practical decision making problems, especially in contexts where the output space is of high-dimension and/or structured by invariances, symmetries and other kinds of constraints. [less ▲]

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See detailBrain connectivity in pathological and pharmacological coma
Noirhomme, Quentin ULg; Soddu, Andrea ULg; Lehembre, Remy ULg et al

in Frontiers in Systems Neuroscience [=FNSYS] (2010), 4

Recent studies in patients with disorders of consciousness (DOC) tend to support the view that awareness is not related to activity in a single brain region but to thalamo-cortical connectivity in the ... [more ▼]

Recent studies in patients with disorders of consciousness (DOC) tend to support the view that awareness is not related to activity in a single brain region but to thalamo-cortical connectivity in the frontoparietal network. Functional neuroimaging studies have shown preserved albeit disconnected low-level cortical activation in response to external stimulation in patients in a “vegetative state” or unresponsive wakefulness syndrome. While activation of these “primary” sensory cortices does not necessarily reflect conscious awareness, activation in higher-order associative cortices in minimally conscious state patients seems to herald some residual perceptual awareness. PET studies have identified a metabolic dysfunction in a widespread frontoparietal “global neuronal workspace” in DOC patients including the midline default mode network (“intrinsic” system) and the lateral frontoparietal cortices or “extrinsic system.” Recent studies have investigated the relation of awareness to the functional connectivity within intrinsic and extrinsic networks, and with the thalami in both pathological and pharmacological coma. In brain damaged patients, connectivity in all default network areas was found to be non-linearly correlated with the degree of clinical consciousness impairment, ranging from healthy controls and locked-in syndrome to minimally conscious, vegetative, coma, and brain dead patients. Anesthesia-induced loss of consciousness was also shown to correlate with a global decrease in cortico-cortical and thalamo-cortical connectivity in both intrinsic and extrinsic networks, but not in auditory, or visual networks. In anesthesia, unconsciousness was also associated with a loss of cross-modal interactions between networks. These results suggest that conscious awareness critically depends on the functional integrity of thalamo-cortical and cortico-cortical frontoparietal connectivity within and between “intrinsic” and “extrinsic” brain networks. [less ▲]

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See detailCyrtospiriferid brachiopods from the mid-Late Devonian of southern Belgium (Namur-Dinant Basin)
Mottequin, Bernard ULg

in The Palaeontological Association. 54th Annual Meeting. Programme and Abstracts (2010, December 18)

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See detailModelling Transient Air-water Flows in Civil and Environmental Engineering
Kerger, François ULg

Doctoral thesis (2010)

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See detailImpact of Climate change on inundation hazard along river Meuse
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2010, December 16)

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See detailAssociation inhibiteurs calciques / inhibiteurs du SRAA : l'avenir?
Krzesinski, Jean-Marie ULg

Conference (2010, December 16)

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See detailWriting a ghost story - Séquence didactique (canevas "Situation-Problème")
Pagnoul, Pierre ULg

Learning material (2010)

Cette présentation propose une séquence didactique qui intègre un contenu culturel dans une série de leçons construites sur le canevas de la "situation-problème".

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See detailLe divorce en droit international privé
Pfeiff, Silvia ULg

Conference (2010, December 14)

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See detailBrucella ceti infection in a harbor porpoise (Phocoena phocoena)
Jauniaux, Thierry ULg; Brenez, Cecile; Fretin, David et al

in Emerging Infectious Diseases (2010), 139(11), 254-7

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See detailSynthèse et caractérisation de nanomatériaux fonctionnels siliciques structurés à l’aide de micelles complexes de copolymères séquencés doublement hydrophiles
Warnant, Jérôme ULg

Doctoral thesis (2010)

This study focused on the design and development of new structuring agents of silica constituted of induced and reversible assemblies of original copolymers, the double hydrophilic block copolymers (DHBC ... [more ▼]

This study focused on the design and development of new structuring agents of silica constituted of induced and reversible assemblies of original copolymers, the double hydrophilic block copolymers (DHBC). The first system studied consists of a neutral-anionic DHBC PAPEO-b-PAA ou poly(acrylate methoxy poly (ethylene oxide))-b-poly (acrylic acid). The PAA block is a weak polyacid with a degree of ionization depending on the pH. In aqueous solution and in a right pH range, the association of this copolymer with a weak polybase, an oppositely charged polyamine, such as an oligochitosan, leads to the formation of polyion complex micelles (PIC) with a core/corona structure. These micelles can direct the structure of highly organized inorganic materials with different types of mesostructures. In a second step, by adjusting the conditions of pH, ionic strength, it is possible to "control" the extraction of organic species to get functional porous materials able to trap species of charge opposite to the functionality. Organized materials are obtained because of a favourable balance of the interactions between organic and inorganic species. If a polyamine/silica interaction occurs at the expense of the interaction polyamine/DHBC, the mesostructuring process by the micelles is limited. A neutral-cationic DHBC PEO-b-PDMAEMA poly(ethylene oxide)-b-poly(2-(dimethylamine)ethyl) associated with an anionic PVS poly(vinyl sulfonic acid) polymer can play a dual role in the synthesis of silica materials: firstly managing the growth of silica particles by interacting with the silicates and secondly acting as a structuring agent in association with PVS, confering a mesostructuration to the material. Finally, a very promising approach allowed to encapsulate water-soluble and charged drugs in a material by using as silica complexing agent a complex between the drug and a DHBC. [less ▲]

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