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See detailAnalyse comparative de la motivation et du sentiment d’efficacité comme facteurs d’engagement liés à la créativité. Cas de futurs enseignants de niveau préscolaire en Roumanie et en Belgique. Projet PEERS 2016-2017
Hausman, Matthieu ULiege

Conference (2017, December 15)

Retour d'expérience sur un projet PEERS mené conjointement entre la Haute Ecole de la Ville de Liège (Belgique) et l'Université Alexandru Ioan Cuza de Iasi (Roumanie). Projet réunissant deux équipes d ... [more ▼]

Retour d'expérience sur un projet PEERS mené conjointement entre la Haute Ecole de la Ville de Liège (Belgique) et l'Université Alexandru Ioan Cuza de Iasi (Roumanie). Projet réunissant deux équipes d'étudiants et enseignants-chercheurs autour du concept de créativité. Les étudiants sont-ils motivés à l'idée de s'engager dans des tâches mobilisant de la créativité? Qu'en est-il de leur sentiment d'efficacité personnelle face à ces tâches? Ce sont ces deux questions qui ont mobilisés les équipes de recherche. Les résultats font état d'une motivation avérée ainsi que d'un sentiment positif. Toutefois, ils ne permettent pas d'observer des différences significatives entre étudiants ayant déjà vécu ce type de tâches et d'autres, inexpérimentés, ni entre les étudiants des deux institutions concernées. [less ▲]

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See detailSensitivity of the Antarctic surface mass balance to oceanic perturbations
Kittel, Christoph ULiege; Amory, Charles ULiege; Agosta, Cécile ULiege et al

Poster (2017, December 15)

Regional climate models (RCMs) are suitable numerical tools to study the surface mass balance (SMB) of the wide polar ice sheets due to their high spatial resolution and polar-adapted physics. Nonetheless ... [more ▼]

Regional climate models (RCMs) are suitable numerical tools to study the surface mass balance (SMB) of the wide polar ice sheets due to their high spatial resolution and polar-adapted physics. Nonetheless, RCMs are driven at their boundaries and over the ocean by reanalysis or global climate model (GCM) products and are thus influenced by potential biases in these large-scale fields. These biases can be significant for both the atmosphere and the sea surface conditions (i.e. sea ice concentration and sea surface temperature). With the RCM MAR, a set of sensitivity experiments has been realized to assess the direct response of the SMB of the Antarctic ice sheet to oceanic perturbations. MAR is forced by ERA-Interim and anomalies based on mean GCM biases are introduced in sea surface conditions. Results show significant increases (decreases) of liquid and solid precipitation due to biases related to warm (cold) oceans. As precipitation is mainly caused by low-pressure systems that intrude into the continent and do not penetrate far inland, coastal areas are more sensitive than inland regions. Furthermore, warm ocean representative biases lead to anomalies as large as anomalies simulated by other RCMs or GCMs for the end of the 21st century. [less ▲]

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See detailAn extension of the Pascal triangle and the Sierpiński gasket to finite words
Stipulanti, Manon ULiege

Conference (2017, December 15)

The binomial coefficient (u,v) of two finite words u and v (on a finite alphabet) is the number of times the word v appears inside the word u as a subsequence (or, as a "scattered" subword). For instance ... [more ▼]

The binomial coefficient (u,v) of two finite words u and v (on a finite alphabet) is the number of times the word v appears inside the word u as a subsequence (or, as a "scattered" subword). For instance, (abbabab,ab)=4. This concept naturally extends the classical binomial coefficients of integers, and has been widely studied for about thirty years (see, for instance, Simon and Sakarovitch). In this talk, I present the research lead from October 2015: I give the main ideas that lead to an extension of the Pascal triangles to base-2 expansions of integers and also give an overview of the results obtained so far, linked to this generalization. [less ▲]

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See detailLe mode de gestion du service de l’eau d’irrigation : Un déterminant de l’efficacité technique des exploitations agrumicoles du périmètre de Souss-Massa au Maroc
Maatala, Nassreddine ULiege; Lebailly, Philippe ULiege

Conference (2017, December 14)

La région du Souss-Massa, connue par la culture agrumicole à haute valeur ajoutée, est confrontée au problème de mobilisation des ressources en eau. Depuis le début de l’année 2000, la nappe du ... [more ▼]

La région du Souss-Massa, connue par la culture agrumicole à haute valeur ajoutée, est confrontée au problème de mobilisation des ressources en eau. Depuis le début de l’année 2000, la nappe du périmètre de la région a atteint la limite de son potentiel renouvelable Cette situation a incité le gouvernement marocain à réaliser un projet de sauvegarde du périmètre El Guerdane situé dans cette région. Ce projet, lancé en 2005, a été réalisé dans le cadre du Partenariat Public-Privé avec un partenaire en charge de la conception et la construction et qui veille à l’exploitation et à la maintenance depuis la mise en eau en 2009. Pour le périmètre d’Issen, situé dans la même région, les agriculteurs souffrent du même problème de mobilisation des ressources en eau et il est toujours géré par l’Office Régional de Mise en Valeur Agricole du Souss-Massa (ORMVASM). L’objectif de cet article est d’étudier l’effet du mode de gestion du service de l’eau d’irrigation (Partenariat public-privé et gestion publique) sur l’efficacité technique des exploitations agrumicoles dans les deux périmètres. L’estimation de la frontière de production et les scores de l’efficacité technique a été réalisée à partir des données collectées sur le terrain d’un échantillon de 121 exploitations agrumicoles situées dans les deux périmètres. La variabilité de ces scores d’efficacité technique est déterminée par plusieurs facteurs notamment la participation au Programme de Partenariat Public-Privé (PPP) et l’adhésion à des coopératives agricoles. L’estimation de la frontière de production et les scores de l’efficacité technique ont été effectués par le logiciel FRONTIER 4.1, l’analyse de l’efficacité a été réalisée à l’aide du logiciel GRETL en utilisant un modèle Tobit. [less ▲]

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See detailThe concept of frailty in patients on dialysis
DELANAYE, Pierre ULiege

Scientific conference (2017, December 14)

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See detailObservation and simulation of ethane (C2H6) at 23 FTIR sites
Mahieu, Emmanuel ULiege; Franco, B; Pozzer, A et al

Poster (2017, December 13)

Ethane is the most abundant non-methane hydrocarbon (NMHC) in the Earth atmosphere. Its main sources are of anthropogenic origin, with globally 62% from leakage during production and transport of natural ... [more ▼]

Ethane is the most abundant non-methane hydrocarbon (NMHC) in the Earth atmosphere. Its main sources are of anthropogenic origin, with globally 62% from leakage during production and transport of natural gas, 20% from biofuel combustion and 18% from biomass burning. In the Southern hemisphere, anthropogenic emissions are lower which makes biomass burning emissions a more significant source. The main removal process is oxidation by the hydroxyl radical (OH), leading to a mean atmospheric lifetime of 2 months. Until recently, a prolonged decrease of its abundance has been documented, at rates of -1 to -2.7%/yr, with global emissions dropping from 14 to 11 Tg/yr over 1984-2010 owing to successful measures reducing fugitive emissions from its fossil fuel sources. However, subsequent investigations have reported on an upturn in the ethane trend, characterized by a sharp rise from about 2009 onwards. The ethane increase is attributed to the oil and natural gas production boom in North America, although significant changes in OH could also be at play.In the present contribution, we report the trend of ethane at 23 ground-based Fourier Transform Infrared (FTIR) sites spanning the 80ºN to 79ºS latitude range. Over 2010-2015, a significant ethane rise of 3-5%/yr is determined for most sites in the Northern Hemisphere, while for the Southern hemisphere the rates of changes are not significant at the 2-sigma uncertainty level. Dedicated model simulations by EMAC (ECHAM5/MESSy Atmospheric Chemistry; ~1.8×1.8 degrees) implementing various emission scenarios are included in order to support data interpretation. The usual underestimation of the NMHCs emissions in the main inventories is confirmed here for RCP85 (Representative Concentration Pathway Database v8.5). Scaling them by 1.5 is needed to capture the background levels of atmospheric ethane. Moreover, additional and significant emissions (~7 Tg over 2009-2015) are needed to capture the ethane rise in the Northern hemisphere. Attributing them to the oil and gas sector and locating them in North America allows EMAC to produce adequate trends in the Northern hemisphere, but not in the Southern hemisphere, where they are overestimated. Possible causes for this difference are discussed. [less ▲]

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See detailRecovery of unlawful tax advantages remains a thorny EU State aid law issue
Van Cleynenbreugel, Pieter ULiege

E-print/Working paper (2017)

A blogpost on State aid and tax rulings, as a contribution to the Regulating for Globalization blog

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See detailDiscovering Routers in Load-balanced Paths
Grailet, Jean-François ULiege; Donnet, Benoît ULiege

in 13th International Conference on emerging Networking EXperiments and Technologies Student Workshop (2017, December 12)

Usually, a set of Traceroute measurements collected for a large amount of target IPs contain one or several route hops at which the IP interfaces vary from one measurement to another. These variations ... [more ▼]

Usually, a set of Traceroute measurements collected for a large amount of target IPs contain one or several route hops at which the IP interfaces vary from one measurement to another. These variations occur even if several measurements share the same length and the same last hops. This is likely a consequence of load balancing, a traffic engineering policy which aims at sharing the load to ensure quality of service. In this paper, we consider the problem of conducting alias resolution on IP interfaces discovered via Traceroute and which are involved in load balancing. By conducting alias resolution in such a context, we want to verify if the IP interfaces involved in load balancing belong to unique routers, and more broadly, how relevant is alias resolution in this context. To do so, we use a slightly edited version of TreeNET, a topology discovery tool which relies on a tree-like structure based on Traceroute measurements to map a target domain. The upgraded TreeNET along the measurements described in this paper are both freely available online. [less ▲]

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See detailAn Observation-Based Middlebox Policy Taxonomy
Edeline, Korian ULiege; Donnet, Benoît ULiege

in 13th International Conference on emerging Networking EXperiments and Technologies Student Workshop (2017, December 12)

Recent years have seen the rise of middleboxes, such as NATs, firewalls, or TCP accelerators. Those middleboxes play an important role in today's Internet, including enterprise networks and cellular ... [more ▼]

Recent years have seen the rise of middleboxes, such as NATs, firewalls, or TCP accelerators. Those middleboxes play an important role in today's Internet, including enterprise networks and cellular networks. However, despite their undisputable success in modern network architecture, their actual impact on packets, traffic, and network performance is not that much understood. In this paper, we propose a path impairment oriented middlebox classification that aims at categorizing the initial purpose of a middlebox policy as well as its potential complications. [less ▲]

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See detailRecent evolution of the coastline in the Gulf of Guinea. Example of Togo and Benin (2000-2016)
Ozer, Pierre ULiege; Hountondji, Yvon-Carmen; De Longueville, Florence

Conference (2017, December 11)

The land-sea interface is an extremely fragile environment. On a global scale, coastlines are threatened by a multitude of factors sometimes natural and mostly anthropogenic. Thus, in addition to the ... [more ▼]

The land-sea interface is an extremely fragile environment. On a global scale, coastlines are threatened by a multitude of factors sometimes natural and mostly anthropogenic. Thus, in addition to the disruptions to coastal areas by port facilities, dams, sediment sampling on the beach or urban sprawl, there are the consequences of climate change, including rising sea levels. Studies conducted in West Africa show important shoreline erosion processes in recent years with many socio-economic consequences. [...] [less ▲]

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See detailVulnérabilité sanitaire et environnementale dans les quartiers inondables de la commune de Cap-Haïtien, Haïti
Bilomba Ngandu, Pontien; Von Frenckell, Marianne ULiege; Ozer, Pierre ULiege

Conference (2017, December 11)

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See detailVulnérabilité aux inondations dans le contexte des changements climatiques à New-Bell Ngangue, un quartier planifié de la ville de Douala, Cameroun
Amanejieu, Amélie; Feumba, Rodrigue Aimé; Ngoufo, Roger et al

Conference (2017, December 11)

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See detailContribution des Systèmes d’Information Géographique pour la cartographie des zones à risques d’inondation à Yaoundé
Zogning Moffo, Maurice Olivier; Ozer, Pierre ULiege; Dewals, Benjamin ULiege

Conference (2017, December 11)

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See detailExposition et vulnérabilité face aux risques d’inondation au Burkina Faso : Cas de la ville de Dori
Tomety, Yaovi Djivénou; Dewals, Benjamin ULiege; Ozer, Pierre ULiege

Conference (2017, December 11)

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See detailVulnérabilité et adaptation des communautés lacustres aux inondations à Sô-Ava dans la basse vallée de l’Ouémé, Bénin
Lokossou, Martin Augustin; De Longueville, Florence; Ozer, Pierre ULiege

Conference (2017, December 11)

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See detail« Cap-Haïtien » or « How to ‘construct’ a flood risk in a decade »
Gracius, Gracia Joseph; Ozer, Pierre ULiege

Conference (2017, December 11)

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See detailRisk management in Ivory Coast: case study of population evictions in Port-Bouët, Abidjan
Comoe, Boua Raymond; Ozer, Pierre ULiege

Conference (2017, December 11)

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