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See detailHPV triggers NK cell cytotoxic activity and cytokine secretion
Jacobs, Nathalie ULg; Renoux, Virginie ULg; Bisig, Bettina ULg et al

Conference (2011)

Background The immune system controls, at least partially, human papillomavirus (HPV) infection and subsequent tumor development as demonstrated by a higher tumor prevalence in immunodeficient patients ... [more ▼]

Background The immune system controls, at least partially, human papillomavirus (HPV) infection and subsequent tumor development as demonstrated by a higher tumor prevalence in immunodeficient patients. Around 90% of HPV-infected women will clear the virus within two years. However, it remains unclear which immune cells are implicated in this process and no study has been performed evaluating the direct interaction between HPV and Natural Killer (NK) cells although these cells play a key role in host resistance to virus and tumor. Methods/Results By immunochemistry, we demonstrated an NK cell infiltration in HPV+ squamous pre-neoplasic lesions. Since HPV cannot grow in vitro, virus-like particles (VLP) were used as a model for studying the NK cell response against the virus. Interestingly, NK cells displayed a higher cytotoxic activity (CD107 and chromium release assays) and cytokine production (TNF-α and IFN-γ) in the presence of HPV-VLP. Uptake of HPV-VLP by dendritic cells (DC) has been shown to induce their activation, therefore, we investigated by flow cytometry and microscopy whether the stimulation of NK cell activity is linked to VLP internalization. We observed a faster entry into these cells compared to DC. Furthermore, virus uptake by NK cells is mediated by macropinocytosis, whereas this entry is dependent on clathrin or caveolin endocytosis pathways in DC. Using NK cell lines expressing or not CD16 and blocking antibody, we demonstrated that CD16 is necessary for HPV-VLP internalization, but also for degranulation and cytokine production. Conclusion Thus, we show for the first time that NK cells interact with HPV and could participate in the immune response against HPV-induced tumors. [less ▲]

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See detailLes bases de textes latins du LASLA : réalisations et projets
Longrée, Dominique ULg

Conference (2011)

Detailed reference viewed: 8 (1 ULg)
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See detailEffect of environmental factors on the interaction plant-pathogen-Bacillus amyloliquefaciens S499
Pertot, I.; Hosni, T.; Pedrotti, L. et al

Conference (2011)

Detailed reference viewed: 23 (5 ULg)
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See detailEulerian Formulation of a Drillstring Constrained inside a Curved Borehole
Denoël, Vincent ULg; Detournay, Emmanuel

Conference (2011)

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See detailModernization of animal products consumption in Hanoi, Northern Vietnam
Vu Dinh, Ton; Phan Dang, Thang; Do Duc, Luc et al

Conference (2011)

Global food crisis has played its negative effects on sustainable development. A question has been raised: how could the families in both rural and urban areas struggle against this present global food ... [more ▼]

Global food crisis has played its negative effects on sustainable development. A question has been raised: how could the families in both rural and urban areas struggle against this present global food crisis? This research aims at documenting household food consumption from January to October 2010 by interviewing with and operating a record keeping system of food consumption in 250 households of various income levels living in two different areas of Hanoi, the inner and suburban districts. There is variety of animal products consumed in each family of both areas. Indeed, pork meat, broiler chickens and freshwater fish were popularly used in all families; and broiler ducks are usually consumed in summer season. Furthermore, in the inner districts, there is a rise in the demand of red meats and aquatic products, particularly beef and seafood products. Home-made foods are still a major source of foods for all family members of most of families, however, families in urban areas tends to have breakfasts and lunches in restaurants. In rural areas, the soya curd (tofu) and self-made products from broiler chickens, vegetables, and the rice play an important role, occupying from 15% to 30% of food expenditures. In addition, pork meat and freshwater fish are usually bought in village markets. Through incomes of 82% of households are mainly from agricultural production or from between agriculture and off-farm activities, thanks to self-made products in most of households, the rural areas are not considerably influent by the present global food and financial crisis. Nevertheless, in order to achieve sustainable development, it is necessary to equip farmers with sufficient knowledge of practical agricultural production. [less ▲]

Detailed reference viewed: 57 (9 ULg)
See detailExergetical Evaluation of Biobased Synthesis Pathways
Frenzel, P; Fayyaz, S; Hillerbrand, R et al

Conference (2011)

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See detailThe effect of symmetric/asymmetric TAG ratio on the crystallization properties and storage stability of fat blends
DeGraef, V.; Vereecken, J.; Danthine, Sabine ULg et al

Conference (2011)

Detailed reference viewed: 15 (2 ULg)
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See detailComputational FE² scheme for heterogeneous shell structures
Massart, Thierry J.; Mercatoris, Benoît ULg; Berke, Peter et al

Conference (2011)

Detailed reference viewed: 20 (1 ULg)
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See detailThe hidden function of NIK (NF-κB-Inducing Kinase) in cell death
Boutaffala, Layla; Bertrand, Mathieu; Remouchamps, Caroline ULg et al

Conference (2011)

Detailed reference viewed: 30 (6 ULg)
See detailLa douleur chez les patients récupérant du coma
Chatelle, Camille ULg

Conference (2011)

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See detailDiversity of governance in European cities: towards an indicators-based analysis of good governance?
Breuer, Christophe ULg

Conference (2011)

Nowadays, the attractiveness of cities and metropolitan areas seems to be a central challenge for competitiveness, territorial cohesion and economic development on a European and regional scale (European ... [more ▼]

Nowadays, the attractiveness of cities and metropolitan areas seems to be a central challenge for competitiveness, territorial cohesion and economic development on a European and regional scale (European Commission, 2009). The interest carried by actors of territorial development on large urban areas and metropolises is essentially explained by their relative weight in regional economies and their role of catalyst for sustainable development. In the absence of competitive cities, many experts estimate that territories cannot completely develop their socio-economic potential. This report is one of the bases of the strategy for city polycentric systems recommended by the development scheme of the European Community space (SDEC - European Commission, 1999), renewed in many strategic European “papers”. This strategy rose during the last decades whereas the dynamic affecting urban areas was strongly modified by the increase in mobility through two scales. On one hand, the intra-urban scale refers to processes of exurbanisation, urban sprawl, as well as functional and institutional fragmentation. On the other hand, the interurban scale has shown phenomenons of metropolisation and an increase in exchanges between cities. Cities changes, networks and urban hierarchies which result from this dynamic, apply new tensions on urban areas - in particular the biggest of them. Theses tensions have to be answered to avoid any loss of competitiveness. In this context, the ‘good governance’ of urban areas is often presented like an essential factor for their development. It is necessary to understand through the notion of “governance” the definition from Le Galès (1995) that is “a process of coordination of actors, social groups, and institutions to achieve clear goals discussed and defined collectively in split up environments”. Thus, cities governance (but also networks of cities) acts on the whole “city system” through all its complexity. The predominant role of governance generally takes the shape of a postulate, as well in the scientific world as in the active and political discourse. Nevertheless, the relation between the governance of urban areas/ cities/ metropolises and their absolute versus relative evolution in networks is not a subject for abundant theoretical studies nor empirical validations. Considering its rasing importance within territorial development policies, it must be clarified allowing a new and quantified highlight on strategies of most important urban areas. While general objectives of urban “good governance” are clearly identified in many documents, concrete impacts of governance on the urban development are ambiguous and unclear. In addition, the definition of “good governance” is regularly paradigm-oriented and often dedicated to the third world or emergent countries (as heritage of many international organisations politic which promotes development and trade efficiency). Furthermore, it appears that former studies on European and North-American cities are relatively factual and suggest a poor typology of the governance in urban areas. They are consequently not very useful for the development of a conceptual model that associates competitiveness of cities and urban governance. Consequently, our research aims at considering the impacts of governance on cities and metropolises through a set of “keys to understanding” theoretically based. We lead our work to a critical analysis of literature in order to highlight expected interactions between governance and urban territories. The construction of a conceptual scheme of interactions will allow the identification of useful indicators of governance. The identification of a set of indicators to measure governance characteristics is valuable for an objective analysis in this field of research. It should allow more precise analyses and the construction of typologies that include multi-dimensional sides of governance. We will focus our attention on European metropolises and cities systems taking into account European specificities of towns, territories and political contexts. As described above, the study is based on reviewing the state-of-art of governance theories (transaction cost, path dependency, management efficiency, etc.) and on exploiting literature about cities competitiveness (characteristics of competitive cities, measurements...). Our conceptual development of a scheme of interactions between governance and urban territories will allow to deal with the issue of governance indicators. Our theory will be tested through samples of European cities (> 500.000 inhabitants). Existing databases will allow the processing of many indicators at the European scale. The choice of a set of indicators will be carried out on the basis of discriminating statistical analysis and conceptual model of interaction allowing the reduction of the variables number. The critical analysis will take into account papers from European Commission and national governments about “good governance” and “cities management”. [less ▲]

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See detailMOQUAC ? a Predictive GE-Model Based on Molecular Orientations
Bronneberg, Rob; Pfennig, Andreas ULg

Conference (2011)

Detailed reference viewed: 4 (0 ULg)
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See detailTowards Laser Cooling of Iron Atoms
Bastin, Thierry ULg

Conference (2011)

Detailed reference viewed: 46 (3 ULg)
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See detailFigures épistémologiques de la fragmentation
Badir, Sémir ULg

Conference (2011)

Detailed reference viewed: 11 (1 ULg)
See detailSimulation of Reactive Extraction Columns Based on Lab-scale Experiments with Single Drops
Kalem, Murat; Buchbender, Florian; Pfennig, Andreas ULg

Conference (2011)

Detailed reference viewed: 4 (0 ULg)
See detailInfluence of solvent flow-rate and flow-direction on plant-material extraction
Bol, J B; Pfennig, Andreas ULg

Conference (2011)

Detailed reference viewed: 1 (0 ULg)
See detailMicrosporidia parasites in Gammarid: a confounding factor in the evaluation of cadmium toxicity
Gismondi, Eric ULg; Rigaud, Thierry; Beisel, Jean-Nicolas et al

Conference (2011)

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See detailThe Herschel view of nebulae around evolved massive stars
Vamvatira-Nakou, Chloi ULg; Royer, P.; Hutsemekers, Damien ULg et al

Conference (2011)

The detailed study of the nebulae ejected from Luminous Blue Variables and the circumstellar bubbles around Wolf-Rayet stars, which radiate strongly in the IR due to the heating of dust, is crucial for ... [more ▼]

The detailed study of the nebulae ejected from Luminous Blue Variables and the circumstellar bubbles around Wolf-Rayet stars, which radiate strongly in the IR due to the heating of dust, is crucial for understanding the massive stars evolution. With Herschel, the largest telescope ever flown in space, we are able to study the gas and the dust in these circumstellar environments in the full far-infrared waveband. In the context of 'Mass-loss of Evolved StarS' Herschel guaranteed time key programme, we have obtained imaging and spectroscopic observations of nebulae associated with Luminous Blue Variable and Wolf-Rayet stars using PACS, one of the three instruments onboard Herschel. A description of these observations and first results of the data analysis are presented. [less ▲]

Detailed reference viewed: 51 (35 ULg)
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See detailLa mise en scène en images de la promenade sacrée des corps saints
George, Philippe ULg

Conference (2011)

http://www.europaethesauri.eu/CA-ANGERS11-16sept.htm

Detailed reference viewed: 25 (3 ULg)
See detailA new design method for stirred liquidliquid extraction columns based on single-drop experiments
Buchbender, Florian; Pfennig, Andreas ULg

Conference (2011)

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See detailCharcoal production at mound kiln sites affects pedogenesis and soil capacity to stabilize organic carbon
Cornelis, Jean-Thomas ULg; hardy, Brieuc; Delvaux, Bruno et al

Conference (2011)

Detailed reference viewed: 10 (2 ULg)
See detailExergetische Bewertung neuer Syntheserouten ausgehend von biobasierten Rohstoffen
Fayyaz, Sara; Frenzel, Philipp; Hillerbrand, Rafaela et al

Conference (2011)

See detailVeneered zirconia in prosthodontics : understanding failures.
MAINJOT, Amélie ULg

Conference (2011)

Detailed reference viewed: 22 (0 ULg)
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See detailL'ordre marchand et le choc des civilisations
Delruelle, Edouard ULg

Conference (2011)

Detailed reference viewed: 11 (2 ULg)
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See detailLa gestion de la diversité dans les entreprises et les organisations
Cornet, Annie ULg

Conference (2011)

Detailed reference viewed: 55 (5 ULg)
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See detailL'inscription territoriale de la gestion des races animales : une recherche pluridisciplinaire
Steyaert, Patrick; Casabianca, François; Baret, Philippe et al

Conference (2011)

Detailed reference viewed: 21 (4 ULg)
See detailLaïcité, dissensus, émancipation
Delruelle, Edouard ULg

Conference (2011)

Detailed reference viewed: 12 (2 ULg)
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See detailLes compétences émotionnelles dans le domaine des activités physiques et sportives. Une analyse de la littérature
Mouton, Alexandre ULg; Cloes, Marc ULg

Conference (2011)

L'étude des facteurs qui influencent l'efficacité de la dyade éducative entre un intervenant et un apprenant a toujours asuscité un véritable engouement dans le domaine de l'intervention en sport. Une des ... [more ▼]

L'étude des facteurs qui influencent l'efficacité de la dyade éducative entre un intervenant et un apprenant a toujours asuscité un véritable engouement dans le domaine de l'intervention en sport. Une des composantes essentielles de la communication interpersonnelle est le lien socio-émotionnel existant entre les acteurs de cette relation. ... [less ▲]

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See detailActivités spontanées en ENMG
WANG, François-Charles ULg

Conference (2011)

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See detailBestimmung von Koaleszenzvorg�ngen - von einzelnen Tropfen bis zur Apparatedimensionierung
Kopriwa, Nicole; Liu, Yang; Pfennig, Andreas ULg

Conference (2011)

Detailed reference viewed: 1 (0 ULg)
See detailExergetische Bewertung der Routen zur stofflichen Nutzung von Biomasse
Frenzel, Philipp; Fayyaz, Sara; Hillerbrand, Rafaela et al

Conference (2011)

Detailed reference viewed: 4 (0 ULg)
See detailTrou du Renard and ongoing work on the Aurignacian of the far North
Dinnis, Rob; Flas, Damien ULg

Conference (2011)

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See detailWhy do poverty reduction strategies not bring real effects in Northern Mountain, Vietnam ? Case of the commune of Xuan Phong and Tu Ly, Hoa Binh province
Mai, Lan Phuong ULg; Lebailly, Philippe ULg; Nguyen Mau, Dung

Conference (2011)

Agricultural accumulation has been one of the main source determined the social differentiation in Vietnamese countryside. The complexities of agrarian changes under the post - socialist industrialization ... [more ▼]

Agricultural accumulation has been one of the main source determined the social differentiation in Vietnamese countryside. The complexities of agrarian changes under the post - socialist industrialization with high rate of agricultural land conversion in recent context reveal the new forms of capital accumulation and social differentiation. This research investigates how land conversion process to industrial zones and clusters affected to the way that different groups of peasant households accumulate their resources. The study was carried out in 3 districts of Hung Yen province from 2006 to 2010. The study results are as follows: first, the land conversion to industrialization has impact on not only the decline of household landholdings but also the changes value of land which are the sources of social conflicts and informal land transfer. Second, in the context of land conversion to industrialization with tiny plots of land, low return from agricultural production and more opportunities of non-farm activities, even when non-farm employment is very profitable, peasant households are not likely to give up their land but maintaining agricultural production for not only their basic and secure livelihood but also for their identity. Third, among the affected peasant groups, the households with non-farm background tend to be in better position in engaging to high - earning activities. They are likely the rich peasants in opposed to the poor group with farming background and lost more than 50% of their agricultural land. This research has showed that the industrialization policies have to deal with the proportion of agricultural land would be transferred for industrialization zones and other measures in order to limit the conflicts as well as the social differentiation in countryside. [less ▲]

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See detailOptimal and robust event-related designs for fMRI
Maus, Bärbel ULg; van Breukelen, Gerard J P; Goebel, R et al

Conference (2011)

Detailed reference viewed: 11 (0 ULg)
See detailThermal model reduction using the super-face concept
Masset, Luc ULg; Bruls, Olivier ULg; Kerschen, Gaëtan ULg

Conference (2011)

The objective of this presentation is to carry out thermal model reduction in the context of the finite element method. The finite element model is decomposed in several sets of adjacent faces called ... [more ▼]

The objective of this presentation is to carry out thermal model reduction in the context of the finite element method. The finite element model is decomposed in several sets of adjacent faces called super-faces. Specialized algorithms such as the METIS partitioning algorithm are used to automatically generate the super-faces. Several constraints may be imposed, e.g., the size of the super-face, its aspect ratio or its aperture angle. Once the model is decomposed, view factors between super-faces are calculated with direct numerical integration or ray-tracing methods. This method offers a very substantial reduction of the computational burden compared to the full model, which is particularly interesting for pre-design studies or specific applications such as deployable structures. [less ▲]

Detailed reference viewed: 40 (13 ULg)
See detailAn X-ray view on ultrafast magnetization switching of GdFeCo
Radu, Ilie; Vahaplar, Kadir; Kirilyuk, Andrei et al

Conference (2011)

Detailed reference viewed: 9 (0 ULg)
See detailInfluence of electrolytes on liquid-liquid separation
Chuttrakul, P; Kopriwa, N; Ruckes, S et al

Conference (2011)

Detailed reference viewed: 1 (0 ULg)
See detailTerritorial observation (T3) - Discussion report
Breuer, Christophe ULg

Conference (2011)

Detailed reference viewed: 67 (5 ULg)
Peer Reviewed
See detailSystemic resistance induced by Bacillus amyloliquefaciens S499 and root colonization is influenced by short exposure to environmental stress
Pedrotti, L.; Hosni, T.; Leoni, V. et al

Conference (2011)

Detailed reference viewed: 14 (1 ULg)
Peer Reviewed
See detailOperational Entanglement classification of symmetric N-qubit states
Bastin, Thierry ULg

Conference (2011)

Detailed reference viewed: 18 (0 ULg)
See detailIdentité reconstructive et dialogue des cultures
Delruelle, Edouard ULg

Conference (2011)

Detailed reference viewed: 10 (0 ULg)
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See detailMotives to begin physical education studies. Comparative analysis in Algeria and Wallonia
Kerfes, Nabil; Alem, Jaouad; Cloes, Marc ULg

Conference (2011)

There are many reasons explaining why students choose one professional project and/or an academic programme. Usually, they consider higher education according to various aspects focusing on the content of ... [more ▼]

There are many reasons explaining why students choose one professional project and/or an academic programme. Usually, they consider higher education according to various aspects focusing on the content of the programme as well as on professions to which the latter leads. This study is in the field on comparative education. It offers a comprehensive reading of two education systems in a spirit of openness and expansion of knowledge. With inspiration from two studies conducted in the education of physical educators in very different cultural contexts (Research Group MJS, 1993, for Algeria – Groupe de recherche interuniversitaire, 2003, for French-speaking Belgium), we have assumed that the students’ motives for registering in studies in physical education should differ considerably. The purpose of this research has therefore been to determine the reasons motivating students to begin a physical education programme at the university or at a non university context. Our research was based, firstly, on the analysis of official texts concerning the organization of higher education in the field of physical education and, secondly, on data collected from the actions involved in four educational institutions, two in the Algiers region and two in the Liege region. In both cultural contexts, one institution belonged to one university and the other one was organized in a non university context. Our results relate to a total sample of 290 subjects (40 members of teaching staffs, 108 students and 142 graduates). The staff members were interviewed while the subjects of two other groups have responded to questionnaires. The Arabic version of each instrument was translated from an original French version. One expert has assured the validity check. In this paper, we are focusing our attention on the analysis of the responses provided by the three types of actors to a question aiming to identify, through four levels Lickert scales, the degree of importance accorded by subject to nine reasons of registration for studies in physical education. Answer were encoded in a computer database and processed using the Statistica software (Stat Soft, 2006). No significant difference was identified when comparing the answers of respondents. However, we noticed that the love of sport and the desire to do sport belonged to the most important reasons for the registration of the new students for training programs in physical education. Cultural context does not seem to affect the opinions of the subjects. [less ▲]

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See detailJatropha curcas in sub-saharian Africa: The big illusion ?
Mergeai, Guy ULg; Terren, Marieke ULg; Jacquet de Haveskercke, P. et al

Conference (2011)

Detailed reference viewed: 29 (7 ULg)
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See detailThe Neandertals of Spy (Belgium) and their context: results of the radiocarbon dating program
Semal, P.; Hauzeur, Anne ULg; Rougier, H. et al

Conference (2011)

Detailed reference viewed: 27 (3 ULg)
See detailMédiations sur le marché du travail des comédiens. Une étude de cas
Orianne, Jean-François ULg

Conference (2010, December 17)

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See detailRendre sensible
Havelange, Carl ULg

Conference (2010, December 17)

Detailed reference viewed: 14 (4 ULg)
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See detailAssociation inhibiteurs calciques / inhibiteurs du SRAA : l'avenir?
Krzesinski, Jean-Marie ULg

Conference (2010, December 16)

Detailed reference viewed: 16 (1 ULg)
See detailCarbon cycle dynamics during interglacials
Brovkin, V; Kleinen, T; Ganopolski, A et al

Conference (2010, December 16)

Explaining a difference in atmospheric CO2 dynamics among interglacials is an elusive issue. Several biogeochemical mechanisms of different origin are involved in interglacial CO2 dynamics leading to a ... [more ▼]

Explaining a difference in atmospheric CO2 dynamics among interglacials is an elusive issue. Several biogeochemical mechanisms of different origin are involved in interglacial CO2 dynamics leading to a CO2 release from the ocean (carbonate compensation, coral growth) compensated by a land carbon uptake (biomass and soil carbon buildup, peat accumulation). The balance between these fluxes of CO2 is delicate and time-dependent, and it is not possible to provide firm constraints on these fluxes from proxy data. The best framework for quantification of all these mechanisms is an Earth System model that includes all necessary physical and biogeochemical components of the atmosphere, ocean, and land. To perform multi-millennial model integrations through the Holocene and Eemian, we use an intermediate complexity climate model, CLIMBER-2, coupled to the LPJ DGVM model with recently implemented boreal peatland module. The global carbon cycle is never in complete equilibrium during the glacial cycles due to changes in small but persistent fluxes such as terrestrial weathering. This complicates setting up the interglacial runs as the usual approach to start model integration from equilibrium state is not valid anymore. To by-pass this problem of non-equilibrium initial conditions, the model is initialized with the oceanic biogeochemistry state taken from a transient CLIMBER-2 simulation through the last glacial cycle. In this simulation, the CLIMBER-2 model was run through the last glacial cycle with carbon cycle in “offline mode” as interactive components of the physical climate system (atmosphere, ocean, ice sheets) were driven by concentration of greenhouse gases reconstructed from ice cores. In response to simulated climate change, the carbon cycle model was able to reproduce the main features of glacial CO2 dynamics reconstructed from ice cores. Results of the CLIMBER-LPJ model integrations through the Holocene and Eemian interglacials in terms of climate changes and atmospheric CO2 and d13CO2 dynamics will be presented. [less ▲]

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See detailImpact of Climate change on inundation hazard along river Meuse
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2010, December 16)

Detailed reference viewed: 27 (4 ULg)
See detailAUTOMATIC CARGO LOAD PLANNING
Limbourg, Sabine ULg

Conference (2010, December 14)

The aircraft loading problem is a real-world combinatorial optimisation problem highly constrained. Indeed, loading the aircraft so the gross weight is less than the maximum allowable is not enough. This ... [more ▼]

The aircraft loading problem is a real-world combinatorial optimisation problem highly constrained. Indeed, loading the aircraft so the gross weight is less than the maximum allowable is not enough. This weight must be distributed to keep the centre of gravity (CG) within specified limits. Balance control refers to the location of the CG. Both lateral and longitudinal balances are important in order to minimize fuel consumption and to satisfy stability and safety requirements. Moreover, an aircraft has usually several cargo compartments with specific contours and structural limitations such as floor loading, combined load limits and cumulative load limitations. The topic of this talk is the description of a mixed integer linear program for the problem of loading a set of Unit Loading Devices (ULDs) and bulk into an aircraft. An ULD can be a container or a pallet and is characterised by the type, contour, weight and height. Experimental results for real data sets show that the model achieves better balanced solutions in only a few seconds compared to the solution obtained by load masters. [less ▲]

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See detailLe divorce en droit international privé
Pfeiff, Silvia ULg

Conference (2010, December 14)

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See detailUsing geostatistical constraints in electrical imaging for improved reservoir characterization
Martin, Roland; Kemna, Andreas; Hermans, Thomas ULg et al

Conference (2010, December 14)

Developing predictive models of reservoirs is often complicated by the spatial heterogeneities and the different scales which control flow and transport processes. In numerous studies over the past two ... [more ▼]

Developing predictive models of reservoirs is often complicated by the spatial heterogeneities and the different scales which control flow and transport processes. In numerous studies over the past two decades, geophysical imaging techniques have proved very useful for reservoir characterization. However, the loss of resolution and the non-uniqueness of standard solutions to inverse problems strongly limit the use of such deterministic imaging approaches. On the other hand, the use of common geostatistical approaches for reservoir characterization, for instance from logging information, may be a difficult task, since accurate variogram information is difficult to obtain (dense sampling in the vertical and lateral directions), and also because a high number of conditioned simulations is needed to remove statistical bias. Combining the high spatial sampling of deterministic geophysical imaging methods with geostatistical constraints, valid in the whole image plane, appears as a very promising approach to enhance reservoir characterization. To do so, we use a parameterized model covariance matrix based on standard variogram functions and a prior model as regularization operator in the inversion of electrical resistance data. This way of including additional data is not restricted to electrical data but the variogram parameters may be also inferred from for example available textural or lithological information. The benefit of the presented approach is twofold: (i) It honors the spatial statistics of the reservoir and (ii) it alters the posterior model by further reducing model ambiguity inherent to the inversion compared to classical (smooth model) regularization. The proof of concept is given by synthetic studies carried out on random fields from Gauss simulations with varying (an)isotropic scale lengths using different model (co)variogram functions. We also demonstrate the approach on electrical field data combined with borehole electromagnetic data from two artificial sea inlets in the nature reserve "The Westhoek" near the French-Belgian border. The electromagnetic logs were used to calculate an experimental vertical variogram characteristic of the study site. The results enabled to determine the extension of the salt water plume laterally, and significantly enhance its extension in depth, but also in terms of total dissolved solid content. These observations are in agreement with the hydrogeological situation at the site. A comparison with borehole data shows that the results are much more plausible than results obtained with a traditional smoothness constraint used as regularization operator. In conclusion, the incorporation of geostatistical information, vertical variograms in our case, in the inverse process improves imaging capabilities for reservoir characterization significantly. [less ▲]

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See detailLa question des sources néo-platoniciennes dans l'aristotélisme de Brentano
Boccaccini, Federico ULg

Conference (2010, December 11)

Detailed reference viewed: 8 (0 ULg)
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See detailStrategies of renal preservation after kidney surgery
Krzesinski, Jean-Marie ULg

Conference (2010, December 11)

Detailed reference viewed: 11 (2 ULg)
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See detailComa and head traumatism
Martin, Didier ULg

Conference (2010, December 11)

Detailed reference viewed: 8 (0 ULg)
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See detailPrécarité et parentalité difficile : une aide coordonnée au bénéfice de l’enfant. « Seconde Peau », le projet de maisons médicales et d’hôpitaux liégeois
Vanmeerbeek, Marc ULg

Conference (2010, December 11)

Une collaboration entre des centres de santé de première ligne (maisons médicales) et des services hospitaliers (Service SOS Familles du CHC - Liège et maternité universitaire au CHR de la Citadelle ... [more ▼]

Une collaboration entre des centres de santé de première ligne (maisons médicales) et des services hospitaliers (Service SOS Familles du CHC - Liège et maternité universitaire au CHR de la Citadelle - Liège) a permis de mettre sur pieds une intervention précoce dans le milieu de vie au bénéfice de nourrissons et jeunes enfants victimes de négligence ou de troubles de l'attachement. [less ▲]

Detailed reference viewed: 116 (13 ULg)
See detailQu’est-ce que l’intuition catégoriale ?
Gyemant, Maria ULg

Conference (2010, December 10)

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See detailErgonomic analysis in chronic low back pain workers
Mairiaux, Philippe ULg

Conference (2010, December 10)

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See detailHaec est ergo fides nostra, per quam salvi eritis. Quand le salut du roi exigeait celui de son peuple.
Close, Florence ULg

Conference (2010, December 10)

Les capitulaires royaux et impériaux carolingiens des VIIIe et IXe siècles regorgent d’injonctions faites aux évêques et aux prêtres de veiller à la formation religieuse du peuple franc. De nombreuses ... [more ▼]

Les capitulaires royaux et impériaux carolingiens des VIIIe et IXe siècles regorgent d’injonctions faites aux évêques et aux prêtres de veiller à la formation religieuse du peuple franc. De nombreuses précisions y sont apportées relatives tant à la matière à enseigner qu’aux moyens autorisés par le ou les souverain(s) pour contraindre hommes, femmes et enfants de toutes conditions à s’instruire. A leur lecture, il devient évident que Charlemagne et ses successeurs se sentaient personnellement responsables du salut de leur peuple et qu’ils restèrent en permanence soucieux de mener à bien cette mission. Cette communciation revient sur ces injonctions et propose quelques réflexions sur la conviction qu’avaient les souverains carolingiens d’être responsables de la formation religieuse du peuple. L'auteur considère les moyens – pédagogiques et coercitifs, menaces spirituelles et pénales – mis en œuvre, d’abord dans l’empire de Charlemagne et de Louis les pieux, puis dans les royaumes issus du traité de Verdun, pour faire adhérer le peuple à la foi chrétienne, en attachant une attention toute particulière aux motivations politiques et idéologiques des souverains. [less ▲]

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