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See detailPaul-Henri Spaak, du Plan Schuman aux traités de Rome : un moteur de l’Europe politique
Genin, Vincent ULg

Conference given outside the academic context (2017)

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See detailLa faillite de la SDN
Genin, Vincent ULg

Conference given outside the academic context (2017)

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See detailPrevalence and characteristics of group B streptococcus colonization in HIV-infected pregnant women in Belgium
DAUBY, Nicolas; ADLER, Catherine; Y MIENDJE DEYI, Véronique et al

Poster (2017, October)

Objectives: High incidence of GBS sepsis has been reported in HIV-exposed but uninfected (HEU) infants in both developed and developing countries, particularly late-onset diseases. We aimed determining ... [more ▼]

Objectives: High incidence of GBS sepsis has been reported in HIV-exposed but uninfected (HEU) infants in both developed and developing countries, particularly late-onset diseases. We aimed determining the prevalence, the characteristics and the risk factors of GBS carriage in HIV-infected and HIV uninfected pregnant women (PW). Methods : Between 1/01/2011 and 31/12/2013, HIV-infected (n=132) and uninfected (n=123) PW had recto-vaginal swabs for GBS detection performed at 35-37 weeks of gestation and at deliver Demographic, obstetrical and medical data related to HIV-infection were prospectively collected. Serotyping of GBS strains was performed on a limited number of randomly selected samples (26 from HIV-infected and 13 from uninfected PW). Results : The overall prevalence of GBS carriage was not statistically different between HIV-infected and uninfected PW (31% vs 24,4% respectively). Age, nadir CD4 cell count, CD4 cell count at delivery and detectable viral load at delivery were not associated with GBS carriage rate in HIV-infected PW. A distinct pattern of GBS serotype was found in HIV-infected PW who were predomina colonized by serotype III (12/26) while HIV-uninfected PW were mostly colonized by serotype Ia (8/13) (p<0,05). Conclusions: As previously reported in other countries, HIV-infected PW do not have significantly higher rate of GBS colonization. However, our results suggest that HIV-infected PW are more lik be colonized with serotype III strains, that is the main serotype associated with late-onset neonatal sepsis. Ongoing research aims at characterizing the clonal features of the isolated strains [less ▲]

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See detailDevelopment of inversion techniques in Asteroseismology
Buldgen, Gaël ULg

Doctoral thesis (2017)

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See detailFrom seed to vegetable and from vegetable to seed : constructing a right to existence
Hecquet, Corentin ULg

Conference (2017, September 12)

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See detailFunctional diversity and mowing regime of flower strips as tools to support pollinators and to suppress weeds
Uyttenbroeck, Roel ULg

Doctoral thesis (2017)

Intensification of agriculture during past decades is one of the causes of biodiversity declines. Ecological intensification has been proposed as a more sustainable alternative of intensive agriculture ... [more ▼]

Intensification of agriculture during past decades is one of the causes of biodiversity declines. Ecological intensification has been proposed as a more sustainable alternative of intensive agriculture that should be able to fulfill worldwide demands of food, by optimizing ecosystem functions and services and reducing environmental impacts. One way to restore ecosystem functions and services in arable fields is creating flower strips in field margins. These flower strips enable wild plant communities to thrive and provide food and shelter to associated fauna. It is often suggested that increasing plant functional diversity could be a tool to optimize ecosystem functioning and ecosystem service delivery, and it could thus be a goal for the creation and management of flower strips. An example of ecosystem functioning studied in this manuscript, is the mutualistic interaction between plants and pollinators. To convince European farmers to implement flower strips, they are included in the subsidized Agri-Environment Schemes. However, there exists no clear appraisal of the pros and cons of flower strips for farmers. By systematically reviewing the literature for pros and cons, we found that most studies concerned agronomical and ecological processes related to flower strips, but few or no studies were dedicated to the social and economic aspects. Furthermore, pollination appears to be an important pro, and weed infestation a possible con, depending on flower strip creation and management. We focused on these two examples in the further study. We investigated (1) whether the increase of plant functional diversity can be used as tool to optimize flower strips for pollinators, (2) whether forb competition and adapting timing and frequency of mowing can be used as tools to limit weeds in flower strips, and (3) whether flower strips perform equally in supporting pollinators as the natural habitat for which they are thought to be a surrogate. To use functional diversity as a tool to optimize flower strips for pollinators, we first tested whether it is possible to create a flower strip with a desired functional diversity level. We sew experimental flower strips with increasing functional diversity, based on visual, morphological and phenological flower traits and surveyed the vegetation composition the first year after sowing. The sown gradient of functional diversity was present, but with lower absolute values due to unequal cover of sown species and due to the presence of spontaneous species. To test the effect on pollinator support, we monitored the plant-pollinator networks in the experimental strips during two years. In contrast to our expectations, pollinator species richness and evenness were not influenced by functional diversity, and increasing functional diversity even resulted in lower flower visitation rates. To investigate the effect of forb competition and timing and frequency of mowing on weed infestation, we created experimental flower strips either with grass and forb species in the seed mixture, either with only grass species. Three different mowing regimes were applied: summer mowing, autumn mowing and mowing both in summer and autumn. The cover of important weed, Cirsium arvense, was limited by adding forbs to the seed mixture and by mowing in summer or in summer and autumn. At last, by surveying plant-pollinator networks in perennial flower strips and natural hay meadows in the same landscape context, we observed that both the plant and the pollinator communities differed between the flower strips and the meadows. Perennial flower strips can thus be considered as a complementary habitat in the landscape and not a hay meadow surrogate. This study suggests that it is possible to manipulate the vegetation as well as infestation by certain weeds in flower strips by adapting the seed mixture and the mowing regime. However, to promote pollinators in flower strips, increasing plant functional diversity appears not to be the key, and the abundance of certain attractive plant species can be more important. Moreover our results suggest that pollinators perceived a lower redundancy of functional plant trait values when functional diversity was higher, as they had more separate feeding niches (less visited flower species in common). Our results also suggest that there could be a trade-off between the increase of functional trait diversity and the floral resource abundance per niche or functional trait combination. With the results of the tested flower strip creation and management methods and their effect on pollinator support and weed infestation, farmers and administrations can try to create and manage flower strips with the desired balance between pros and cons, and researchers can try to refine these methods and test the effects on other pros and cons. [less ▲]

See detailValence des verbes et interdépendances entre lexique et syntaxe en kirundi
Tuyubahe, Pascal ULg

Doctoral thesis (2017)

Ce travail de recherche a pour objet de décrire des phénomènes lexicaux et syntaxiques du kirundi peu examinés précédemment. Il est subdivisé en deux principales parties : la première partie est consacrée ... [more ▼]

Ce travail de recherche a pour objet de décrire des phénomènes lexicaux et syntaxiques du kirundi peu examinés précédemment. Il est subdivisé en deux principales parties : la première partie est consacrée à l’élaboration d’un lexique valenciel des verbes avec un ou plusieurs compléments, en prenant comme points de départ la liste de lexèmes de de Samie (2008) ainsi que le dictionnaire rundi-français de Rodegem (1970). Il s’avère que beaucoup de verbes peuvent apparaître dans différents schémas de construction, ce qui implique plusieurs unités lexicales pour ces verbes dans le lexique valenciel. La deuxième partie, composée de sept chapitres, consiste en la recherche de généralisations pouvant être faites à partir de ce lexique ; ces généralisations reposant sur une large base empirique, elles sont assez fréquemment accompagnées d’exceptions. Le chapitre 1 concerne le comportement syntaxique des groupes nominaux et groupes prépositionnels dans la valence des verbes et leur caractérisation par des tests; il y est question des objets directs, des objets prépositionnels, des circonstants et des attributs. Un chapitre est consacré au passif impersonnel (chapitre 2) car cette construction fournit une justification purement empirique à la catégorie « objet prépositionnel » en kirundi, permettant de distinguer les objets prépositionnels (locatif ou non) des autres compléments (y compris les circonstants valenciels de lieu). Le chapitre 3 montre l’importance quantitative des objets directs par rapport aux autres objets du lexique valenciel des verbes en kirundi et montre comment cette importance est encore accrue par l’existence en kirundi d’objets directs non valenciels, en particulier les objets introduits par l’intermédiaire d’un suffixe verbal (suffixe applicatif -ir- ou suffixe causatif -i- ou -iish-) et les possesseurs inaliénables introduits sans intermédiaire. Après avoir fait une présentation générale des temps et aspects et de la concordance des temps en kirundi (chapitre 4), les chapitres 5, 6 et 7 montrent comment cela se manifeste dans les propositions subordonnées valencielles et les propositions avec auxiliaire, en distinguant celles qui ont un verbe conjugué et celles qui ont un infinitif. Les conclusions générales sont suivies des propositions prospectives permettant d’effectuer des recherches approfondies en vue de compléter le lexique valenciel, d’une part et, d’autre part, de déterminer les conditions d’emploi des suffixes causatifs -i- et -iish-. [less ▲]

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See detailL'abandon de sanctuaires et le transfert de cultes en Grèce antique
Palamidis, Alaya ULg

Doctoral thesis (2017)

Dans la Grèce antique, les sanctuaires anciens comme les sanctuaires nouvellement fondés étaient censés continuer à être fréquentés indéfiniment. Cependant, ce n’était pas le cas de tous les lieux de ... [more ▼]

Dans la Grèce antique, les sanctuaires anciens comme les sanctuaires nouvellement fondés étaient censés continuer à être fréquentés indéfiniment. Cependant, ce n’était pas le cas de tous les lieux de culte: certains pouvaient être abandonnés, de même que les divinités qui y étaient honorées, tandis que d’autres divinités continuaient à être honorées à un emplacement différent. Ce travail vise en premier lieu à analyser les sources littéraires, épigraphiques et surtout archéologiques qui nous renseignent sur des tels abandons de sanctuaires et transferts de cultes. L’étude de deux types de déplacements de population, les synécismes et les métécismes, au cours desquels de tels abandons et transferts sont documentés, permet par la suite de réfléchir notamment aux raisons qui expliquent l’abandon de certains sanctuaires plutôt que d’autres. L’analyse des sources disponibles suggère que ni les abandons de sanctuaires, ni les transferts de culte n’étaient considérés comme la transgression d’une norme tacite ou orale et que ces phénomènes sont beaucoup plus courants que ce qui est généralement supposé. [less ▲]

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See detailPouvoir et action publique
Grandjean, Geoffrey ULg

Learning material (2017)

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See detailVisco-plastic Chaboche model for nickel-based alloys under anisothermal cyclic loading
Morch, Hélène ULg; Duchene, Laurent ULg; Habraken, Anne ULg

in Proceedings of the XIV International Conference on Computational Plasticity (2017, September)

The mechanical behavior of visco-plastic materials such as nickel-based alloys is highly dependent on temperature. Some characteristics such as viscosity, hardening, static recovery, dynamic recovery have ... [more ▼]

The mechanical behavior of visco-plastic materials such as nickel-based alloys is highly dependent on temperature. Some characteristics such as viscosity, hardening, static recovery, dynamic recovery have more or less influence on the overall behavior depending on the considered temperature. The unified constitutive model developed by Chaboche [1] is very efficient in representing this complexity as it is very adaptable and can contain many features. A basic Chaboche model contains a viscosity law and one or several hardening equations. Within these hardening equations, it is possible to add several features that will represent the complex behavior of the material. The aim of this study is to understand the role of the different parameters and the influence of the different features in an advanced Chaboche model adapted to cyclic anisothermal loading. This specific model was also developed in [2],[3]. However, part of this study is based on particular cases where different features of the model are analyzed [4]–[6]. [less ▲]

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See detailDamage Detection in Structures Based on Principal Component Analysis of Forced Harmonic Responses
Golinval, Jean-Claude ULg

in Procedia Engineering (2017, September)

An approach based on principal component analysis (PCA) is considered here to tackle the problem of structural damage detection. The key idea of PCA is to reduce a large number of measured data to a much ... [more ▼]

An approach based on principal component analysis (PCA) is considered here to tackle the problem of structural damage detection. The key idea of PCA is to reduce a large number of measured data to a much smaller number of uncorrelated variables while retaining as much as possible of the variation in the original data. PCA is applied here to the problem of damage detection in structures submitted to harmonic excitation. When processing vibration measurements, it can be shown that the basis of eigenvectors (called the proper orthogonal modes) span the same subspace as the mode-shape vectors of the monitored structure. Thus the damage detection problem may be solved using the concept of subspace angle between a reference subspace spanned by the eigenvectors of the initial (undamaged) structure and the subspace spanned by the eigenvectors of the current (possibly damaged) structure. The method is illustrated on the example of a real truss structure for damage detection and is combined to a model updating technique for damage localization. [less ▲]

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See detailSemantic Background Subtraction
Braham, Marc ULg; Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

in IEEE International Conference on Image Processing (ICIP), Beijing 17-20 September 2017 (2017, September)

We introduce the notion of semantic background subtraction, a novel framework for motion detection in video sequences. The key innovation consists to leverage object-level semantics to address the variety ... [more ▼]

We introduce the notion of semantic background subtraction, a novel framework for motion detection in video sequences. The key innovation consists to leverage object-level semantics to address the variety of challenging scenarios for background subtraction. Our framework combines the information of a semantic segmentation algorithm, expressed by a probability for each pixel, with the output of any background subtraction algorithm to reduce false positive detections produced by illumination changes, dynamic backgrounds, strong shadows, and ghosts. In addition, it maintains a fully semantic background model to improve the detection of camouflaged foreground objects. Experiments led on the CDNet dataset show that we managed to improve, significantly, almost all background subtraction algorithms of the CDNet leaderboard, and reduce the mean overall error rate of all the 34 algorithms (resp. of the best 5 algorithms) by roughly 50% (resp. 20%). Note that a C++ implementation of the framework is available at http://www.telecom.ulg.ac.be/semantic. [less ▲]

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See detailConsidering Rich Spatiotemporal Relationships in Cultural Heritage Information Management
Hallot, Pierre ULg

in Lecture Notes in Geoinformation and Cartography (2017)

This paper describes the use of rich spatiotemporal relationships in cultural heritage information modelling in order to increase the information organization and extraction. The idea is to tailor the ... [more ▼]

This paper describes the use of rich spatiotemporal relationships in cultural heritage information modelling in order to increase the information organization and extraction. The idea is to tailor the spatiotemporal state of identity model, i.e. a model based on spatiotemporal identity that takes into account relationships between non-existing and non-presents objects, to the management cultural heritage information. In doing so, we propose an enhancement of the knowledge representation for cultural heritage. [less ▲]

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See detailHigh-resolution reconstruction of 8.2 ka event recorded in Belgian Holocene speleothems
Allan, Mohammed ULg; verhyden, sophie; Fagel, Nathalie ULg

Scientific conference (2017, August 24)

Two abrupt shifts in d18O and trace element contents of a stalagmite from the northwestern European continent (southern Belgium) suggest that two cold anomalies occurred beginning at 8.4±0.04 and ending ... [more ▼]

Two abrupt shifts in d18O and trace element contents of a stalagmite from the northwestern European continent (southern Belgium) suggest that two cold anomalies occurred beginning at 8.4±0.04 and ending at 8.15±0.03, possibly reflecting climatic effects associated with the 8.2 ka event. The younger of the two anomalies lasted about 30 years, from 8.18 to 8.15±0.03 ka, with a maximum d18O amplitude of 1.4‰. Trace element (Sr, Ba and Mg) peaks coincide with this second drop of d18O. The anomaly initiation is marked by Sr, Ba and Mg concentration peaks suggesting drier conditions during the coldest years, consistent with previous research in the North Atlantic. The earlier anomaly in trace element, d18O records is associated with generally cold but wet conditions at 8.4 ka, lasted 50 years, and ended abruptly. The interval from 8.4 ka to 8.15 ka was less favorable for speleothem deposition, with denser speleothem calcite deposition and lower growth rate, consistent with a cold, dry climate. The clear recovery in both temperature and rainfall between after both anomalies (8.2 and 8.4 ka), suggests that these anomalies are distinct, and may represent two episodes of AMOC weaking related to the drainage of proglacial lakes Agassiz and Ojibway. [less ▲]

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See detailWho Cares for Those Who Cared? An Intersectional Ethnography of Global Social Protection Arrangements
Vivas Romero, Maria ULg

Doctoral thesis (2017)

How and through which repertoires of practices do migrant domestic workers access global social protection? And how do their gender, race, class, and generational positioning along with their ... [more ▼]

How and through which repertoires of practices do migrant domestic workers access global social protection? And how do their gender, race, class, and generational positioning along with their transnational family relations affect this access? This dissertation deals with these questions and focuses on the case of Peruvian and Colombian Migrant Domestic Workers in the city of Brussels. Such migrants share a paradoxical positioning as they contribute productively and reproductively to the development of their receiving and sending societies but experience a lack of formal and informal social protection on both sides. This analysis first maps through a multi-sited ethnography the repertoire of practices they use to strategize their access to Social Protection in the areas of: 1- old-age and survivors benefits, 2- incapacity, 3- health & family, 4- active labor market programs, 5- unemployment, 6-housing, and education, 7- community and family support. Secondly, it theorizes these practices as Global Social Protection Arrangements that are simultaneously made out of transnational interpersonal relationships and formal support systems. Thirdly, building from the work of Anthias (2016) a Translocations lens is used to analyze how these actor’s gender, race, class, religious and generational positioning within the global reproduction of labor as well as within their transnational family networks simultaneously affect the functionality of such arrangements. Concluding, it’s argued that more privileged migrant domestic workers will use arrangements composed mostly of formal resources, while less privileged ones will see formal avenues less open to them and therefore have to rely on an informal arrangement. Far, from the rights based normative approach to social protection, this thesis provides a glance at how transnational access to social protection is strategize across borders. Furthermore, it’s relevant in a context of increasing human mobility where inequalities in access to social protection emerge as a public transnational social question (Faist, 2016) that is suitable both for academics and policy makers. [less ▲]

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See detailEffect of AP102, a subtype 2 and 5 specific somatostatin analog, on glucose metabolism in rats
Tarasco, Erika; Seebeck, Petra; Pfundstein, Svende et al

in Endocrine (2017)

Somatostatin analogs are widely used to treat conditions associated with hormonal hypersecretion such as acromegaly and metastatic neuroendocrine tumors. First generation somatostatin analogs, such as ... [more ▼]

Somatostatin analogs are widely used to treat conditions associated with hormonal hypersecretion such as acromegaly and metastatic neuroendocrine tumors. First generation somatostatin analogs, such as octreotide and lanreotide, have high affinity for somatostatin receptor subtype 2 (SSTR2), but have incomplete efficacy in many patients. Pasireotide targets multiple SSTRs, having the highest affinity for SSTR5, but causes hyperglycemia and diabetes mellitus in preclinical and clinical studies. AP102 is a new somatostatin analogs with high affinity at both SSTR2 and SSTR5. We aimed to characterize the effects of AP102 vs. pasireotide on random and dynamic glucose levels, glucoregulatory hormone concentrations and growth axis measures in healthy Sprague-Dawley rats. [less ▲]

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