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See detailCross-entropy based rare-event simulation for the identification of dangerous events in power systems
Belmudes, Florence ULg; Ernst, Damien ULg; Wehenkel, Louis ULg

in Proceedings of the 10th International Conference on Probabilistic Methods Applied to Power Systems (PMAPS-08) (2008)

We propose in this paper a novel approach for identifying rare events that may endanger power system integrity. This approach is inspired by the rare-event simulation literature and, in particular, by the ... [more ▼]

We propose in this paper a novel approach for identifying rare events that may endanger power system integrity. This approach is inspired by the rare-event simulation literature and, in particular, by the cross-entropy (CE) method for rare event simulation. We propose a general framework for exploiting the CE method in the context of power system reliability evaluation, when a severity function defined on the set of possible events is available. The approach is illustrated on the IEEE 30 bus test system when instability mechanisms related to static voltage security are considered. [less ▲]

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See detailRestauration des potentialités de sols dégradés à l’aide du zaï et du compost dans le Yatenga (Burkina Faso)
Sawadogo, H.; Bock, Laurent ULg; Lacroix, D. et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2008), 12(3),

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See detailApport de l'imagerie par tomographie a emission de positons dans la pathologie pleurale. Interet de la TEP en pathologie pleurale.
Duysinx, Bernard ULg; Corhay, Jean-Louis ULg; Larock, Marie-Paule et al

in Revue des Maladies Respiratoires (2008), 25(2), 129-38

INTRODUCTION: Positron emission tomography (PET) has a clear role in oncology, particularly in thoracic disease. In the light of our experience and a revue of the literature we define precisely the role ... [more ▼]

INTRODUCTION: Positron emission tomography (PET) has a clear role in oncology, particularly in thoracic disease. In the light of our experience and a revue of the literature we define precisely the role of metabolic imaging in the diagnosis of pleural pathology. BACKGROUND: In particular PET allows characterisation of malignant pleural disease and provides prognostic information in mesothelioma. Metabolic imaging provides clinical information for the staging of pulmonary cancer, in the search for a primary tumour in metastatic pleurisy and also in the follow up of chronic or recurrent pleural pathology. CONCLUSIONS: It is justified, therefore, that PET joins the diagnostic armamentarium of pleural pathology, solid or liquid. [less ▲]

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See detailFitness And Genetic Variation Of Viola Calaminaria, An Endemic Metallophyte: Implications Of Population Structure And History
Bizoux, Jean-Philippe ULg; Daïnou, Kasso ULg; Raspe, O. et al

in Plant Biology (2008), 10(6), 684-693

We investigated variations in genetic diversity and plant fitness in a rare endemic metallophyte of calamine soils, Viola calaminaria, in relation to population size, population connectivity and ... [more ▼]

We investigated variations in genetic diversity and plant fitness in a rare endemic metallophyte of calamine soils, Viola calaminaria, in relation to population size, population connectivity and population history in order to evaluate and discuss potential conservation strategies for the species. Mean population genetic diversity (Hs = 0.25) of V. calaminaria was similar to endemic non-metallophyte taxa. Twenty-one per cent of the genetic variation was partitioned among populations and a low (9%) but significant differentiation was found among geographical regions. Our results did not support the hypothesis that the acquisition of metal tolerance may result in reduced genetic diversity, and suggested that strict metallophytes do not exhibit higher inter-population differentiation resulting from scattered habitats. There were no relationships between population genetic diversity and population size. Significant correlations were found between plant fitness and (i) population size and (ii) connectivity index. Recently-founded populations exhibited the same level of genetic diversity as ancient populations and also possessed higher plant fitness. There was no indication of strong founder effects in recently-established populations. The results suggest that the creation of habitats through human activities could provide new opportunities for conservation of this species. [less ▲]

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See detailAn integrated mathematical modelling framework for the study of bone fracture healing
Geris, Liesbet ULg; Vander Sloten, Jos; Van Oosterwyck, Hans

in Journal of Biomechanics (2008), 41

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See detailLe purisme enfantin au prisme du discours spontané
Meunier, Deborah ULg

in Français Moderne (Le) (2008), LXXXVI/1

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See detail"Strategies of life detection": Summary and outlook
Botta, Oliver; Bada, Jeffrey L; Gomez-Elvira, Javier et al

in Space Science Reviews (2008), 135(1-4), 371-380

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See detailVivre à quarante kilomètres de Rome : Juxtaposition des modes d’habiter dans les campagnes romaines
Schmitz, Serge ULg; Banini, Tiziana

in Bulletin de la Société Géographique de Liège (2008), 50

By a study of the rural ways of living, the paper analyses the dynamics of the countryside around Rome from a residential point of view. It describes the people and their expectations of the countryside ... [more ▼]

By a study of the rural ways of living, the paper analyses the dynamics of the countryside around Rome from a residential point of view. It describes the people and their expectations of the countryside. It suggests five types of ways of living the countryside. It stresses that the lack of land and planning policy leads to a dismantling of rural communities. Finally, the analysed communes are classified according to a typology of countryside (agricultural countryside, fragile countryside, suburban countryside, and living countryside). The analysis demonstrates the high spatial variability of the suburban countryside, especially when they are analysed at the village level. [less ▲]

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See detailIron microbial mats in Modern and Phanerozoic environments
Baele, J. M.; Boulvain, Frédéric ULg; De Jong, J. et al

in Instruments, Methods and Missions for Astrobioçlogy- Proc. of SPIE (2008), 7097

The recognition of iron microbial mats in terrestrial environments is of great relevance for the search for extraterrestrial life, especially on mars where significant iron minerals were identified in the ... [more ▼]

The recognition of iron microbial mats in terrestrial environments is of great relevance for the search for extraterrestrial life, especially on mars where significant iron minerals were identified in the subsurface. Most researches focused on very ancient microbial mats (e.g. BIFs) since they formed on Earth at a time where similar conditions are supposed to have prevailed on Mars too. However, environmental proxies are often difficult to use for these deposits on Earth which, in addition, may be heavily transformed due to diagenesis or even metamorphism. Here we present modern and phanerozoic iron microbial mats occurrences illustrating the wide variety of environments in which they form, including many marine settings, ponds, creeks, caves, volcanoes, etc. Contrarily to their Precambrian counterparts, Modern and Phanerozoic deposits are usually less affected by diagenesis and the environmental conditions likely to be better constrained. Therefore, their investigation may help for the search for morphological and geochemical biosignatures (e.g. iron isotopes) in ancient iron microbial occurrences on Earth but also on other Planets. In particular, many of the case studies presented here show that microstromatolithe-like morphologies may be valuable targets for screening potential biosignatures in various rock types. [less ▲]

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See detailOn the evolution and expression of Chlamydomonas reinhardtii nucleus-encoded transfer RNA genes
Cognat, Valerie; Deragon, Jean*-Marc; Vinogradova, Elizaveta et al

in Genetics (2008), 179(1), 113-123

In Chlamydomonas reinhardtii, 259 tRNA genes were identified and classified into 49 tRNA isoaccepting families. By constructing phylogenetic trees, we determined the evolutionary history for each tRNA ... [more ▼]

In Chlamydomonas reinhardtii, 259 tRNA genes were identified and classified into 49 tRNA isoaccepting families. By constructing phylogenetic trees, we determined the evolutionary history for each tRNA gene family. The majority of the IRNA sequences are more closely related to their plant counterparts than to animals ones. Northern experiments also permitted LIS to show that at least one member of each IRNA isoacceptor family is transcribed and correctly processed in vivo. A short stretch of T residues known to be a signal for termination of polymerase III transcription was found downstream of most IRNA genes. It allowed us to propose that the vast majority of the IRNA genes are expressed and to confirm that numerous IRNA genes separated by short spacers are indeed cotranscribed. Interestingly, in silico analyses and hybridization experiments show that the cellular IRNA abundance is correlated with the number of tRTNA genes and is adjusted to the codon usage to optimize translation efficiency. Finally, we studied the origin of SINEs, short interspersed elements related to tRNAs, whose presence in Chlamydomonas is exceptional. Phylogenetic analysis strongly suggests that tRNA(Asp)-related SINEs originate front a prokaryotic-type IRNA either horizontally transferred from a bacterium or originally present in mitochondria or chloroplasts. [less ▲]

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See detailDe onzin van het vanzelfsprekende beeld
Meesters, Gert ULg

in Freespace Nieuwzuid (2008), (31), 47-56

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See detailThe Perturbation Finite Element Method for Magnetic Modeling of a Loudspeaker
Ferreira da Luz, Mauricio V.; Dular, Patrick ULg; V Sabariego, Ruth ULg et al

in Proceedings of 6ème Conférence Européenne sur les Méthodes Numériques en Electromagnétisme (NUMELEC2008) (2008)

This paper shows that the application of a perturbation finite element method can provide a useful alternative to correct the equivalent magnetic circuits used to model loudspeakers. A ring magnet design ... [more ▼]

This paper shows that the application of a perturbation finite element method can provide a useful alternative to correct the equivalent magnetic circuits used to model loudspeakers. A ring magnet design of a loudspeaker is modeled by means of an axisymmetric magnetic vector potential formulation. The effects of geometry variations on its performances are analyzed. The perturbation solution allows further adapting and refining the equivalent magnetic circuit model of the loudspeaker to each possible variation. Results will be compared with the classical finite element solution. [less ▲]

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See detailPrevalence de l'infection par le VIH chez les femmes enceintes. Etude en milieu rural africain.
Mathe, M Kirere; Rigo, Jacques ULg; Sontag, Danièle et al

in Revue d'Epidémiologie et de Santé Publique (2008), 56(6), 407-13

BACKGROUND: The goal of the study is to assess the prevalence and risk factors of HIV in pregnant women in the North-East rural area of the Democratic Republic of Congo. METHODS: We undertook an ... [more ▼]

BACKGROUND: The goal of the study is to assess the prevalence and risk factors of HIV in pregnant women in the North-East rural area of the Democratic Republic of Congo. METHODS: We undertook an exploratory study on women attending the antenatal care during the study period (from December 2002 to December 2004) in the referral General hospital of the health catchments' area of Oicha (DRC). Women with gestational age equal or above 36 weeks were included in the study. After a first test using rapid test Abbott Determine locally, a second crossing check was performed in the referral HIV laboratory in Liege (Belgium). RESULTS: Among 5016 participants tested, 94 were positive (prevalence of 1.9% [CI95% 1.5-2.5]). Following factors predict a risk of being positive among participants: the statute of displacement (OR: 5.77; IC95%: 3.59-9.29); widowhood and divorces (OR: 4.47; IC95%: 1.47-13.60); mobility related to the profession of the husband (OR: 4.00; IC95%: 2.36-6,75); living the countryside (OR: 1.67; IC95%: 1.06-2.62; p: 0.0258). [less ▲]

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See detailAn experimental analysis of effects induced by moving bodies in shallow water
Kerger, François ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

in Proc. 2nd International Junior Researcher and Engineer Workshop on Hydraulic Structures (2008)

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See detailQuantum imaging with uncorrelated single photon sources
Bastin, Thierry ULg

in Proceedings of SPIE (2008)

We propose a technique to obtain sub-wavelength resolution using photons from uncorrelated single photon sources. The method employs N photons of wavelength λ spontaneously emitted from N atoms and ... [more ▼]

We propose a technique to obtain sub-wavelength resolution using photons from uncorrelated single photon sources. The method employs N photons of wavelength λ spontaneously emitted from N atoms and subsequently detected by N detectors. We demonstrate that for certain detector positions the N-th order correlation function as a function of the first detector position is a pure sinusoidal oscillation with a fringe spacing of λ/N and a contrast of 100%. The result corresponds to an N-fold increase in resolution compared to classical microscopy. Our technique is also capable of imaging a distinct physical object with sub-Rayleigh resolution. [less ▲]

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See detailIl problema della pace
Schweitzer, Albert; Ricciardi, Stefania ULg

in Barillari, Simone (Ed.) Costruire la pace. Discorsi dei premi Nobel per la pace (2008)

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