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See detailLes évolutions du phénomène urbain : précision des concepts et modélisation
Halleux, Jean-Marie ULg

Conference (2001, February 28)

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See detailLes évolutions du système de production du logement en Wallonie : vers la fin de l'étalement urbain ?
Halleux, Jean-Marie ULg

Conference given outside the academic context (2015)

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See detailEvolutions et changement de paradigme dans la fonction publique fédérale belge
Piron, Damien ULg

in Revue de la Faculté de Droit de l'Université de Liège (2012), 4

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See detailÉvolutions multiples et intérêts nouveaux en matière de climatologie depuis 1970.
Erpicum, Michel ULg

Scientific conference (2014, February 25)

Evolution of the knowledge of the main variables of the climates of the Earth according to the recent evolution of the principal tools of climatology and instrumental data coming from international or ... [more ▼]

Evolution of the knowledge of the main variables of the climates of the Earth according to the recent evolution of the principal tools of climatology and instrumental data coming from international or national networks or from experimental measurements conducted in Climatological or Meteorological Institutes. [less ▲]

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See detailEvolutions récentes de l'évaluation de la recherche. Quelques concepts pertinents
Leclercq, Bruno ULg

in Zaccai, Edwin (Ed.) Penser la science: L’évaluation de la recherche en question (2016)

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See detailAn Evolutive Software Environment for Teaching the Finite Element Method in Electromagnetism
Dular, Patrick ULg; Geuzaine, Christophe ULg; Genon, André ULg et al

in IEEE Transactions on Magnetics (1999), 35(3), 1682--1685

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See detailAn Evolutive Software Environment for Teaching the Finite Element Method in Electromagnetism
Dular, Patrick ULg; Geuzaine, Christophe ULg; Genon, André ULg et al

in Proceedings of the Eighth Biennal IEEE Conference on Electromagnetic Field Computation (1998)

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See detailEVOLVE: entre déception et optimisme
DELANAYE, Pierre ULg; Krzesinski, Jean-Marie ULg; CAVALIER, Etienne ULg

in Néphrologie & Thérapeutique (2013), 9(4), 241-245

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See detailThe evolved early-type binary HDE 228766 revisited
Rauw, Grégor ULg; Crowther, P. A.; Eenens, P. R. J. et al

in Astronomy and Astrophysics (2002), 392(2), 563-574

We use an extensive set of spectroscopic observations to reinvestigate the properties of the massive binary HDE 228766. Conventional classification criteria suggest that HDE 228766 consists of an O7 ... [more ▼]

We use an extensive set of spectroscopic observations to reinvestigate the properties of the massive binary HDE 228766. Conventional classification criteria suggest that HDE 228766 consists of an O7 primary and an Of(+) secondary. However, several spectral features of the secondary, such as the simultaneous presence of N III, N IV and N V emissions, make it a rather unusual object. We find that the orbital motion of the secondary is probably best described by the radial velocities of the narrow N III emission lines. Our orbital solution yields m(1) sin(3) i = 31:7 and m(2) sin(3) i = 25:5 M. for the primary and secondary respectively. The He II lambda 4542 absorption in the secondary's spectrum appears considerably blue-shifted with respect to the narrow emission lines, indicating that the absorption is probably formed in the accelerating part of the secondary's wind. We use a tomographic technique to investigate the profile variability of the broader emission lines. In addition to a strong emission from the secondary, the Halpha line displays a weak emission feature that is probably associated with a wind interaction region located near the surface of the primary star. Finally, our analysis of the spectrum with a non-LTE code indicates that the secondary is an evolved object that exhibits some CNO processed material in its atmosphere and has a large mass loss rate. Assuming a distance of 3.5 kpc (which follows from adopting M-V,M-s = -6 for the secondary) we infer (M) over dot similar or equal to 10(5) M. yr(-1) for the secondary. Our results suggest that HDE 228766 could be in a post-Roche lobe overflow stage. The secondary may be classified as WN8ha and is currently in a transition stage between a "normal" Of staranda WNL-type Wolf-Rayet star. [less ▲]

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See detailThe evolving chemical composition of C/2012 S1 ISON as it approached the Sun
Dello Russo, N.; Vervack, R.; Weaver, H. et al

in Muinonen, Karri (Ed.) Asteroids, Comets, Meteors 2014 (2014, July 01)

Shortly after its discovery by Vitali Nevski and Artyom Novichonok on September 21, 2012, the orbit of C/2012 S1 ISON was determined, indicating a perihelion passage very close to the Sun (0.012 au) in ... [more ▼]

Shortly after its discovery by Vitali Nevski and Artyom Novichonok on September 21, 2012, the orbit of C/2012 S1 ISON was determined, indicating a perihelion passage very close to the Sun (0.012 au) in late November 2013. Initial observations suggested that ISON could be quite bright with a long period of favorable observing conditions leading up to perihelion, followed by a close post-perihelion approach to the Earth (0.42 au) in December 2013. Comet ISON thus became the first sungrazing comet discovered early enough to be studied for many months prior to perihelion, through its close solar passage, and potentially after perihelion. This spurred a worldwide campaign to coordinate observations of ISON from numerous facilities covering a broad spectral range. We report volatile abundances in comet ISON as determined from high-resolution (R ˜ 25,000) infrared spectroscopy. Our strategy was to use the NIRSPEC spectrometer at the 10-m Keck observatory and the CSHELL spectrometer on the 3-m IRTF telescope. We proposed to use NIRSPEC when the comet was fainter but still available during darktime (October through early November 2013 pre-perihelion, and January 2014 post-perihelion), and CSHELL when the comet was brighter and closer to the Sun, but only available during daytime. Although observations on many dates were lost owing to poor weather, and the disruption of the comet near perihelion prevented any post-perihelion observations, successful observations were obtained with NIRSPEC on October 26 (R_h= 1.12 au, Δ = 1.38 au) and October 28 (R_h = 1.08 au, Δ = 1.32 au), and CSHELL on November 19 (R_h = 0.46 au, Δ = 0.86 au) and November 20 (R_h = 0.43 au, Δ = 0.86 au). All dates are specified in UT. The primary results from these observations are as follows. (1) The overall volatile productivity as measured by the H_2O production rate increased from ˜ 10^{28} molec/s on October 26 and 28 to ˜ 3-4×10^{29} molec/s on November 19/20. (2) The volatile production rate was increasing rapidly as ISON approached perihelion, and we investigate whether statistically significant variations in volatile production rates are seen on November 19 between UT 17:15 to 23:00. (3) The relative abundances of some measured volatiles with respect to water remained constant during this time period (e.g., C_2H_6 and CH_3OH), whereas others increased significantly from late October to November 19/20 (e.g., C_2H_2, NH_2, NH_3). (4) Comparison of the measured spatial distributions within the coma of ISON on November 19 show differences that suggest some species are released from extended sources in the coma as well as ices in the nucleus. (5) C_2H_6, CH_3OH and CH_4 appear slightly depleted relative to H_2O in ISON compared to other comets. C_2H_2, HCN, and OCS abundances appear to be in the typical range on November 19, although C_2H_2 abundances appeared depleted in October. Abundances of H_2CO, NH_2, and NH_3 in November were significantly enhanced compared to other comets, with NH_3 abundances being the highest measured to date in any comet. This contrasts with measured abundances and upper limits for NH_2 and NH_3 in late October, which are closer to the typical values seen in comets. [less ▲]

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See detailEvolving definitions of remission in Crohn's disease.
Panaccione, Remo; Colombel, Jean-Frederic; Louis, Edouard ULg et al

in Inflammatory bowel diseases (2013), 19(8), 1645-53

BACKGROUND: Using clinical symptoms alone to inform treatment decisions in Crohn's disease (CD) may increase the risk of disease progression and complications. Treatment beyond symptoms may offer improved ... [more ▼]

BACKGROUND: Using clinical symptoms alone to inform treatment decisions in Crohn's disease (CD) may increase the risk of disease progression and complications. Treatment beyond symptoms may offer improved outcomes. METHODS: We explore alternative definitions of remission, beyond traditional clinical remission, incorporating more objective parameters of inflammation control, which may support prevention or delay the disease progression. These definitions could serve as a platform for future clinical research, evaluating whether treating beyond symptoms alters the natural history of CD. RESULTS: Proposed definitions may include endoscopic remission (mucosal healing), normalization of serologic or fecal markers of inflammation, and even radiographic remission, in addition to clinical remission (symptom control). Endoscopic remission is the leading candidate for inclusion because it is the best studied. The definition should include considerations for both early and late disease given that in late disease, which may be associated with operation-related symptoms or irreversible bowel damage, symptomatic remission may not achievable. Desired outcomes in early disease are complete absence of symptoms, no disease progression, no complications or disability, and normal quality of life. In late disease, there are stabilization of noninflammatory symptoms, no progression of damage or disability, and improved quality of life. CONCLUSIONS: Over time, we anticipate that a working definition of remission that includes both biological remission and clinical remission will evolve and be evaluated in clinical trials. Our proposed definition is a possible starting point for that evolution. Ultimately, the goal in evolving the definition of remission is to improve the outcomes in patients with CD. [less ▲]

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See detailEvolving Representations of Migrancy in Dionne Brand’s Novels
Mergeai, Mathilde ULg

Scientific conference (2012)

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See detailEvolving science, technology and innovation policies in Belgium: a comparative study
Charlier, Nathan ULg

Conference (2013, April)

Science, technology and innovation (STI) policies have gone through deep changes since the early 80’s. Multiple scholars have shown that there are new forms of links, or a renewed “contract” between ... [more ▼]

Science, technology and innovation (STI) policies have gone through deep changes since the early 80’s. Multiple scholars have shown that there are new forms of links, or a renewed “contract” between science, as an institution, and the society: effects of neoliberalism, public controversies or technology assessment (TA) practices are some common features of this transformation. Innovation is pushed forward by policymakers as a crucial tool for economic growth and competitiveness of political entities. In other words, there is a new regime of STI governance. As a PhD student, I investigate the policies of science and innovation in Belgium. Since the regionalization of these competences in the 1980’s, the STI regimes have evolved separately in Flanders and Wallonia. The goal of my research is to depict and compare how constitutive elements of the regimes such as discourses, tools, institutions, networks, etc. have changed in the two Regions. Adopting a cognitive approach in policy analysis, I focus on the imaginaries or master narratives that shape programs and individuals at different policy levels. These levels range from the “micro” (individual interactions in the institutions) to the “macro” (the EU and OECD), the “meso” level being the core of the research question (regional programs and institutions). I seek to point out the local enactment of ideas such as “regional competitiveness”, “innovation-led growth”, “clustering” and its impact on STI regime. The research relies on document analysis, participant observation, and in depth semi-structured interviews designed as life stories of key STI informants. [less ▲]

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See detailEvolving Temporal Association Rules with Genetic Algorithms
Matthews, Stephen G.; Gongora, Mario A.; Hopgood, Adrian ULg

in Bramer, Max; Petridis, Miltos; Hopgood, Adrian (Eds.) Research and Development in Intelligent Systems XXVII: Incorporating Applications and Innovations in Intelligent Systems XVIII Proceedings of AI-2010, The Thirtieth SGAI International Conference on Innovative Techniques and Applications of Artificial Intelligence (2011)

A novel framework for mining temporal association rules by discovering itemsets with a genetic algorithm is introduced. Metaheuristics have been applied to association rule mining, we show the efficacy of ... [more ▼]

A novel framework for mining temporal association rules by discovering itemsets with a genetic algorithm is introduced. Metaheuristics have been applied to association rule mining, we show the efficacy of extending this to another variant - temporal association rule mining. Our framework is an enhancement to existing temporal association rule mining methods as it employs a genetic algorithm to simultaneously search the rule space and temporal space. A methodology for validating the ability of the proposed framework isolates target temporal itemsets in synthetic datasets. The Iterative Rule Learning method successfully discovers these targets in datasets with varying levels of difficulty. [less ▲]

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See detailEvolving Temporal Fuzzy Association Rules from Quantitative Data with a Multi-Objective Evolutionary Algorithm
Matthews, Stephen G.; Gongora, Mario A.; Hopgood, Adrian ULg

in Lecture Notes in Artificial Intelligence (2011), 6678

A novel method for mining association rules that are both quantitative and temporal using a multi-objective evolutionary algorithm is presented. This method successfully identifies numerous temporal ... [more ▼]

A novel method for mining association rules that are both quantitative and temporal using a multi-objective evolutionary algorithm is presented. This method successfully identifies numerous temporal association rules that occur more frequently in areas of a dataset with specific quantitative values represented with fuzzy sets. The novelty of this research lies in exploring the composition of quantitative and temporal fuzzy association rules and the approach of using a hybridisation of a multi-objective evolutionary algorithm with fuzzy sets. Results show the ability of a multi-objective evolutionary algorithm (NSGA-II) to evolve multiple target itemsets that have been augmented into synthetic datasets. [less ▲]

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See detailEvolving temporal fuzzy itemsets from quantitative data with a multi-objective evolutionary algorithm, 
Matthews, S. G.; Gongora, M. A.; Hopgood, Adrian ULg

in Genetic and Evolutionary Fuzzy Systems (GEFS), 2011 IEEE 5th International Workshop on,  (2011)

We present a novel method for mining itemsets that are both quantitative and temporal, for association rule mining, using multi-objective evolutionary search and optimisation. This method successfully ... [more ▼]

We present a novel method for mining itemsets that are both quantitative and temporal, for association rule mining, using multi-objective evolutionary search and optimisation. This method successfully identifies temporal itemsets that occur more frequently in areas of a dataset with specific quantitative values represented with fuzzy sets. Current approaches preprocess data which can often lead to a loss of information. The novelty of this research lies in exploring the composition of quantitative and temporal fuzzy itemsets and the approach of using a multi-objective evolutionary algorithm. This preliminary work presents the problem, a novel approach and promising results that will lead to future work. Results show the ability of NSGA-II to evolve target itemsets that have been augmented into synthetic datasets. Itemsets with different levels of support have been augmented to demonstrate this approach with varying difficulties.,  [less ▲]

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