ORBi Open Repository and Bibliography
In may 2007, the ULg's Administrative Board (joined in June 2007 by the FUSAGx) decided to create an institutional repository and defined a strong institutional self-archiving policy to increase the visibility, accessibility and impact of the University's publications (Board's decision).
This decision led to the official launch, in November 2008, of the ORBi platform including both the Academic Bibliography and the Institutional Repository of the Wallonia-Europe University Academy.
Engineering, computing & technology
Mostrando recursos 1 - 20 de 3.935
Elasto-inertial turbulence in polymeric flows - Terrapon, Vincent; Dubief, Yves; Soria, Julio
The dynamics of elasto-inertial turbulence (EIT) is investigated numerically from the perspective of the coupling between polymer dynamics and flow structures. In particular, direct numerical simulations of channel flow with Reynolds numbers ranging from 1000 to 6000 are used to study the formation and dynamics of elastic instabilities and their effects on the flow. Based on the splitting of the pressure into inertial and polymeric contributions, it is shown that the trains of cylindrical structures around thin sheets of high polymer extension that are characteristics to elasto-inertial turbulence are mostly driven by polymeric contributions.
Ślad węglowy betonu - Załęgowski, Kamil; Jackiewicz-Rek, Wioletta; Garbacz, Andrzezj; Courard, Luc
Different approaches of carbon foot print of concrete estimation were investigated. It was shown that value of CO2 emissions varies depending on accepted specificity of calculations. Special attention was focused on possibilities of production of concrete with decreased „carbon foot print”. Reduction of cement content by mineral additives replacement in concrete mixture as well as influence of aggregate type used, conditions of concrete transport and built in and CO2 sequestration via carbonation process
du ring „pri ma ry and se cond li fe” of con -
cre te we re al so ta ken in to con si de ra tion.
Monitoring temperature changes during heat tracing experiments using electrical resistivity tomography - Hermans, Thomas; Wildemeersch, Samuel; Nguyen, Frédéric
Thermal tracing experiments are becoming common in hydrogeology to estimate parameters governing heat transport processes and to study geothermal reservoirs. Electrical resistivity tomography (ERT) has proven its ability to monitor salt tracer tests, but few studies have investigated its performances, both qualitatively and quantitatively, in thermal tracing experiments. In this study, we monitored a heat injection and pumping experiment in an alluvial aquifer using both surface and crosshole ERT. The data sets of the surface profile, located along the main direction of flow, are distorted during injection by an electrical short-circuit through the external pumping-heating-injection experimental set-up. Current is flowing...
Reliability of resistivity-derived temperature: insights from laboratory measurements - Robert, Tanguy; Hermans, Thomas; Dumont, Gaël; Nguyen, Frédéric
This contribution consists in studying the reliability of resistivity-derived temperature, for example from time-lapse electrical resistivity tomography (ERT) surveys. The idea of using temperature as a quantitative tracer is growing in the hydrogeophysical community, especially to simulate geo/hydrothermal systems. However, plenty of physico-chemical processes are influenced by temperature and most of them impact directly resistivity measurements. Therefore, one needs to take them into account to retrieve quantitative temperature estimates from resistivity measurements but, up to now, it is seldom the case. The experiment we conducted consisted in simulating an ERT monitoring of heat storage in a sandy aquifer. We show...
Minimum gradient support and geostatistics regularization approaches for inverting time-lapse data - Nguyen, Frédéric; Hermans, Thomas; Robert, Tanguy
Inversion of time-lapse resistivity data allows obtaining ‘snapshots’ of changes occurring in monitored systems for applications such as aquifer storage, site remediation or tracer tests. Based on these snapshots, one can infer qualitative information on the location and morphology of changes occurring in the subsurface but also quantitative estimates on the degree of changes in certain property such as temperature or total dissolved solid content. Analysis of these changes can provide direct insight into flow and transport processes and controlling parameters. However, the reliability of the analysis is dependent on survey geometry, measurement schemes, data error, or regularization. Except regularization,...
Conception et instrumentation d'un bâtiment prototype en ballots de paille - Dubois, Samuel
Le pavillon Africasylves constitue un projet de construction durable, réalisé au sein de la Faculté de Gembloux. Ce bâtiment a deux facettes bien distinctes : l’information, en offrant une application concrète de concepts écologiques et pouvant démontrer leur bien-fondé au plus grand nombre, et la recherche scientifique. Son étude vise en effet à mettre en évidence les réponses concrètes que les techniques de construction en paille peuvent apporter face à la crise environnementale et la remise en cause profonde des pratiques du secteur du bâtiment.
Le texte commence par définir les notions développées, comme le bâtiment durable, les matériaux écologiques...
Probabilistic Models of Visual Appearance For Object Identity, Class, and Pose Inference - Teney, Damien
The topic of object recognition is a central challenge of computer vision. In addition to being studied as a scientific problem in its own right, it also counts many direct practical applications. We specifically consider robotic applications involving the manipulation, and grasping of everyday objects, in the typical situations that would be encountered by personal service robots. Visual object recognition, in the large sense, is then paramount to provide a robot the sensing capabilities for scene understanding, the localization of objects of interests and the planning of actions such as the grasping of such objects.
This thesis presents a number of...