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See detailORBi : user friendly interface & services
Chalono, Dominique ULg; Dohogne, Cécile ULg

Scientific conference (2016, October 25)

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See detailInventory routing for perishable products
Rezaei Sadrabadi, Mahmood ULg

Doctoral thesis (2016)

We explore three problems in this thesis and develop solution methods for each problem. First, an inventory routing problem for a perishable product with stochastic demands is considered and different ... [more ▼]

We explore three problems in this thesis and develop solution methods for each problem. First, an inventory routing problem for a perishable product with stochastic demands is considered and different approximate solution methods are developed to solve. Based on computational experiments, the solution methods are compared in terms of average profit, service level, and actual freshness. The impact of relevant parameters on the performance of the solution methods is investigated. Managerial insights are drawn by analyzing the impact of shelf life and store capacity on the profit. The value of considering uncertainty and the value of accessing full information are measured. The computational results highlight that a simple ordering policy can often replace a more sophisticated solution method, while preserving the same efficacy. Second, we introduce a vehicle routing problem (VRP) where a set of stores places deterministic orders to a logistics service provider (LSP) for two successive periods. Deliveries requested in each period can be shifted by the LSP to the other period, possibly with modified quantities. The LSP incurs a penalty for any diversion from the initial delivery period. The data regarding shifted delivery quantities and penalties are provided by the stores. From the perspective of the LSP, diversions could be beneficial if savings in the routing costs outweigh the penalties. In this work, we introduce a new two-period VRP model where the LSP seeks to improve its total cost, compared to solving two independent VRPs with fixed delivery periods, by allowing deliveries to be shifted. We solve this model to optimality by an efficient branch-and-price algorithm implementing several cutting-edge techniques. We draw algorithmic and managerial insights based on our test instances. Third, a two-period VRP is considered where the orders placed by stores for each period can be partially shifted to the other period, given that the sum of the delivery quantities in two periods to each customer is fixed. A linear penalization of delivery shifts is assumed based on the quantity shifted. We represent two mixed integer linear programming (MILP) formulations for the problem. A column-row generation algorithm to solve the LP-relaxation of the first formulation is developed. To solve the LP-relaxation of the second formulation, we develop a column generation algorithm. Details of two label-setting algorithms to solve the pricing problems of the column-row generation and column generation algorithms are discussed. Numerical results can be compared with a similar model in which only full delivery shifts are allowed. [less ▲]

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See detailLa importación literaria a finales del siglo XIX en Colombia: el caso de José Asunción Silva
Mogollon Zapata, Juan Manuel ULg

Conference (2016, October 25)

The analysis of the of Silva’s collection of works places us in quite a disconcerting, yet no less encouraging, position, when re-assessing the different forms of importing literary movements. On one hand ... [more ▼]

The analysis of the of Silva’s collection of works places us in quite a disconcerting, yet no less encouraging, position, when re-assessing the different forms of importing literary movements. On one hand, the image attributed to Silva both by his contemporaries and his successors is that of the leading figure in the assimilation and absorption of the literary European movements that would give rise to modernism. On the other hand, the absence of public visibility for Silva’s works, be it through texts or paratexts, let us in a difficult situation to prove the poet’s will to position himself as the one who introduced the new literary movement to Colombia. If we accept from the outset, as we will in this article, that the Colombian poet possessed an obstinate determination to appropriate and assimilate the European literary movements that give rise to modernism, then we must entertain the possibility that Silva’s literary transfer took place through media other than books, journals or magazines. Our hypothesis is that by focusing on the acts of reading and poise, the literary coterie became the ideal platform for the Colombian writer to adopt and propagate the image of the decadent writer, which would become the embodiment of the aesthetic ideals of modern literature. [less ▲]

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See detailLe droit international : un fleuron de la Belgique
Genin, Vincent ULg

Conference given outside the academic context (2016)

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See detailA benchmark for urban flood modelling
Arrault, Anaïs; Finaud-Guyot, Pascal; Archambeau, Pierre ULg et al

Poster (2016, October 25)

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See detailVelocimetry of superconducting vortices based on stroboscopic resonances
Jelic, Zeljko ULg; Milosevic, Milorad; Silhanek, Alejandro ULg

in Scientific Reports (2016), 6

An experimental determination of the mean vortex velocity in superconductors mostly relies on the measurement of flux-flow resistance with magnetic field, temperature, or driving current. In the present ... [more ▼]

An experimental determination of the mean vortex velocity in superconductors mostly relies on the measurement of flux-flow resistance with magnetic field, temperature, or driving current. In the present work we introduce a method combining conventional transport measurements and a frequency-tuned flashing pinning potential to obtain reliable estimates of the vortex velocity. The proposed device is characterized using the time-dependent Ginzburg-Landau formalism, where the velocimetry method exploits the resonances in mean vortex dissipation when temporal commensuration occurs between the vortex crossings and the flashing potential. We discuss the sensitivity of the proposed technique on applied current, temperature and heat diffusion, as well as the vortex core deformations during fast motion. [less ▲]

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See detailUn cadrage général pour l'éducation aux médias?
Hamers, Jérémy ULg

Conference (2016, October 24)

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See detailTopos de Grothendieck et fonctions holomorphes tempérées
Dubussy, Christophe ULg

Conference (2016, October 24)

Dans les années 60, Grothendieck révolutionna la géométrie algébrique en introduisant le concept de topos. Faisant face à des situations où la notion d'ouvert était trop restrictive pour comprendre les ... [more ▼]

Dans les années 60, Grothendieck révolutionna la géométrie algébrique en introduisant le concept de topos. Faisant face à des situations où la notion d'ouvert était trop restrictive pour comprendre les phénomènes géométriques sous-jacents, il définit une nouvelle notion de topologie dans le langage de la théorie des catégories. Très utilisée pour résoudre des problèmes de géométrie et d'analyse contemporains, cette notion a aussi de nombreuses applications surprenantes en logique (théorie intuitionniste, équivalence de Morita, etc ...). Dans ce séminaire je proposerai une application de la théorie des topos de Grothendieck pour étudier les fonctions et les distributions tempérées. En effet, ces objets ne forment un faisceau que sur une topologie de Grothendieck particulière (la topologie sous-analytique), qui n'est pas une topologie au sens usuel du terme. Je montrerai alors, de manière abstraite, comment définir un faisceau de fonctions holomorphes tempérées qui a joué un rôle crucial dans la démonstration de la correspondance de Riemann-Hilbert (généralisation du 21ème problème d'Hilbert). En particulier, ce nouveau faisceau fournira une nouvelle définition, presque purement algébrique, des distributions de Schwartz. [less ▲]

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See detailThe recent increase of methane from 10 years of NDACC ground-based FTIR observations
Bader, Whitney ULg

Conference (2016, October 24)

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See detailAlgunas consideraciones metodológicas sobre la teoría de las transferencias
Mogollon Zapata, Juan Manuel ULg

Conference (2016, October 24)

Las siguientes consideraciones metodológicas surgen esencialmente de la confrontación de la teoría de las transferencias con mi corpus actual de trabajo, esto es, con las modalidades de importación ... [more ▼]

Las siguientes consideraciones metodológicas surgen esencialmente de la confrontación de la teoría de las transferencias con mi corpus actual de trabajo, esto es, con las modalidades de importación literaria durante el modernismo, época que, como todos sabemos, constituyó un momento de apertura privilegiado para la apropiación y asimilación de las producciones culturales extranjeras. Los escollos metodológicos encontrados a medida que avanzábamos en la problematización de nuestro corpus sirvieron pues de estímulo para integrar y transponer algunos conceptos y herramientas teóricas tomados principalmente de la teoría de los campos de Pierre Bourdieu, del análisis del discurso a la manera de Dominique Maingueneau y de la poética histórica de los soportes tal y como ha sido desarrollada en Francia por Alain Vaillant y Marie-Ève Thérenty. Es a partir de dicho diálogo que podemos hoy afinar ciertos conceptos y herramientas teóricas indispensables para repensar algunos puntos ciegos de la teoría de las transferencias. [less ▲]

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See detailThermochemical conversion of sugar industry by-products to biofuel
Nicodème, Thibault ULg; Jacquet, Nicolas ULg; Richel, Aurore ULg

Poster (2016, October 24)

Poster concernant la conversion des co-produits de l'industrie sucrière en biocarburants via la voie thermochimique. Description des procédés tels que la gazéification, Fischer-Trospch, la pyrolyse.

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See detailMyoferlin regulates cellular lipid metabolism and promotes metastases in triple-negative breast cancer
Blomme, Arnaud; Costanza, Brunella ULg; De Tullio, Pascal ULg et al

in Oncogene (2016)

Myoferlin is a multiple C2-domain-containing protein that regulates membrane repair, tyrosine kinase receptor function and endocytosis in myoblasts and endothelial cells. Recently it has been reported as ... [more ▼]

Myoferlin is a multiple C2-domain-containing protein that regulates membrane repair, tyrosine kinase receptor function and endocytosis in myoblasts and endothelial cells. Recently it has been reported as overexpressed in several cancers and shown to contribute to proliferation, migration and invasion of cancer cells. We have previously demonstrated that myoferlin regulates epidermal growth factor receptor activity in breast cancer. In the current study, we report a consistent overexpression of myoferlin in triple-negative breast cancer cells (TNBC) over cells originating from other breast cancer subtypes. Using a combination of proteomics, metabolomics and electron microscopy, we demonstrate that myoferlin depletion results in marked alteration of endosomal system and metabolism. Mechanistically, myoferlin depletion caused impaired vesicle traffic that led to a misbalance of saturated/unsaturated fatty acids. This provoked mitochondrial dysfunction in TNBC cells. As a consequence of the major metabolic stress, TNBC cells rapidly triggered AMP activated protein kinase-mediated metabolic reprogramming to glycolysis. This reduced their ability to balance between oxidative phosphorylation and glycolysis, rendering TNBC cells metabolically inflexible, and more sensitive to metabolic drug targeting in vitro. In line with this, our in vivo findings demonstrated a significantly reduced capacity of myoferlin-deficient TNBC cells to metastasise to lungs. The significance of this observation was further supported by clinical data, showing that TNBC patients whose tumors overexpress myoferlin have worst distant metastasis-free and overall survivals. This novel insight into myoferlin function establishes an important link between vesicle traffic, cancer metabolism and progression, offering new diagnostic and therapeutic concepts to develop treatments for TNBC patients. [less ▲]

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See detailEvaluation de l'impact socio-économique en aval des aménagements hydroélectriques : exemple du barrage hydroélectrique de Nam Mang 3 au Laos
Kouangpalath, Phimthong ULg

Doctoral thesis (2016)

Since two decades, hydropower projects are multiplying in Laos. These projects are often criticized in the media and civil society organizations for their negative social and environmental impacts, which ... [more ▼]

Since two decades, hydropower projects are multiplying in Laos. These projects are often criticized in the media and civil society organizations for their negative social and environmental impacts, which can also generate regional geopolitical tensions in Southeast Asia. In this sensitive context, our interest has focused on rural populations downstream of hydropower dams; these populations are often ignored by compensation programs reserved for displaced populations from upstream. The objective of the research is to identify and assess the socio-economic effects in the Nam Nyam Valley (Vientiane Province, Lao PDR), downstream of the Nam Mang 3 hydropower dam. A current diagnostic-analysis of the agrarian system of the valley, together with a characterization of the recent evolution was conducted by household surveys in different villages. The diachronic study of agrarian dynamics and understanding the links of causality enabled us to model a counterfactual scenario to isolate, by difference with the current situation (scenario "with project"), the specific effects of the dam. In parallel, a similar approach was employed downstream of the Nam Lik 1-2 hydropower dam in the Meuang Feuang basin (Vientiane province, Lao PDR) in order to compare with the results of the Nam Nyam Valley, to better characterize the specific effects of hydropower infrastructure developments. As a result, the evolution of agrarian systems in the valleys downstream depends on the combination, variable over time, of several political, economic, demographic, environmental, technical, social, etc. factors. A hydropower dam, like the one of Nam Mang 3 is part of complex and continuous dynamics of transformation; its impact is not only the sole cause of changes affecting the communities. The socio-economic effects influence over time a much larger population downstream than upstream, even if the media attract the attention on punctual displacement of villages (and their compensation) to fill the reservoir. The hydropower dam project effects differ according to phases (construction, reservoir filling, operation) and social categories, depending on the investment capacities, adaptation and networks of each category. The socio-economic impact downstream is not assumed to be correlated with the size of hydropower dam, but its design and mode of water management are the key criteria of the importance of negative externalities. The massive investments in these projects have also positive effects for the local population, such as the development of local infrastructure, which open up villages and provide access to public services and markets. However, these positive externalities mainly concern well-off villagers disposing of capital and networks to benefit of new opportunities, while poor families are more vulnerable to changes in the political, environmental, technical and socio-economic context. Thus, hydropower dams contribute to increased socio-economic differentiation in villages downstream, with the poor left out of the profits from the energy export. [less ▲]

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See detailSU(3) Clebsch-Gordan coefficients at large $N_c$
Stancu, Floarea ULg

in Nuclear Physics A (2016), 945

It is argued that several papers where SU(3) Clebsch-Gordan coefficients were calculated in order to describe properties of hadronic systems are, up to a phase convention, particular cases of analytic ... [more ▼]

It is argued that several papers where SU(3) Clebsch-Gordan coefficients were calculated in order to describe properties of hadronic systems are, up to a phase convention, particular cases of analytic formulae derived by Hecht in 1965 in the context of nuclear physics. This is valid for irreducible representations with multiplicity one in the corresponding Clebsch-Gordan series. For multiplicity two, Hecht has proposed an alternative which can provide correct $1/N_c$ sub-leading orders in large $N_c$ studies. [less ▲]

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See detailLe clergé à Eupen-Malmedy durant l'entre-deux-guerres
Brüll, Christoph ULg

Conference given outside the academic context (2016)

Depuis les premières publications sur l’évolution dans les territoires devenus belges en 1920, on sait que le clergé y avait un rôle politique important dans les débats politiques tendus de l’entre-deux ... [more ▼]

Depuis les premières publications sur l’évolution dans les territoires devenus belges en 1920, on sait que le clergé y avait un rôle politique important dans les débats politiques tendus de l’entre-deux-guerres. Comme le reste de la population, il est tiraillé entre deux patries – Belgique et Allemagne –, mais il l’est surtout aussi entre deux évêchés – Liège et Cologne. L’expérience des prêtres dans la région frontalière belgo-allemande illustre alors, parfois douloureusement, le champ de tension entre l’aspiration universelle de l’Église catholique et les convictions national(ist)es de ceux qui la représentent sur place. [less ▲]

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See detailModéliser pour comprendre les phénomènes
Karous, Hamad ULg; Nihant, Brigitte ULg; Leyh, Bernard ULg

Conference (2016, October 22)

Il existe actuellement un consensus sur le fait que les scientifiques ne décrivent pas la réalité telle qu’elle est dans toute sa complexité mais qu’ils en construisent des représentations qui leur ... [more ▼]

Il existe actuellement un consensus sur le fait que les scientifiques ne décrivent pas la réalité telle qu’elle est dans toute sa complexité mais qu’ils en construisent des représentations qui leur permettent de l’expliquer partiellement et de la maîtriser, partiellement également. De telles représentations sont généralement appelées des modèles et le processus de leur construction est la modélisation. Les référentiels et programmes de sciences insistent de plus en plus, dans un souci d’authenticité épistémologique, sur la nécessité de confronter les élèves aux modèles établis et à leur élaboration, afin qu’ils se constituent une vision aussi fidèle que possible de l’entreprise scientifique. Le concept de modèle possède des composantes multiples et il n’est pas aisé d’en donner une définition compacte, complète et définitive. On pourrait tenter de dire, en bref, que modéliser, c’est simplifier délibérément pour pouvoir expliquer et agir efficacement. On peut envisager différents types de modèles qui ne s’excluent pas mutuellement. On les rencontrera dans les différentes activités expérimentales que nous proposons. (i) On peut tout d’abord modéliser une situation expérimentale complexe (une pile commerciale ou un accumulateur, par exemple) par une autre situation apparentée mais plus simple et dont on contrôle mieux les paramètres, afin de mettre leur influence en lumière. Diverses expériences sur les piles (de Daniell, entre autres) illustrent cet aspect. Les expériences proposées sur la diffusion entrent également dans cette catégorie. (ii) En chimie, le principe explicatif fondamental consiste à fonder les observations macroscopiques sur des processus décrits au niveau sub-microscopique (atomes, molécules, ions, électrons). Cette représentation sub-microscopique peut être schématique et/ou symbolique. Pour plusieurs des expériences proposées, on demande de représenter schématiquement les mouvements des particules concernées. On demande aussi de traduire le phénomène en un langage symbolique, l’écriture de la réaction chimique. Ici aussi, il s’agit d’une modélisation : quand on écrit HCl(aq), par exemple, on remplace une situation complexe et relativement mal définie – des ions H3O+ et des ions Cl- hydratés avec éventuellement plusieurs couches d’hydratation – par une écriture compacte qui représente de manière conventionnelle l’essentiel de l’information dont on a besoin dans un but déterminé (un titrage, par exemple). [less ▲]

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See detailConclusions
Dozo, Björn-Olav ULg; Philippette, Thibault; Servais, Olivier

Conference (2016, October 22)

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