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See detailHusserl, Frege et Hilbert. Théorie des systèmes formels
Leclercq, Bruno ULg

in Brisart, Robert; Benoist, Jocelyn; Lavigne, Jean-François (Eds.) Penser aujourd'hui avec Husserl : La phénoménologie transcendantale et son contexte (2013)

Detailed reference viewed: 118 (4 ULg)
See detailHusserl, Freud et la position de l’inconscient
Gyemant, Maria ULg

Conference (2011, February 19)

Detailed reference viewed: 12 (0 ULg)
See detailHusserl, Leroi-Gourhan et la préhistoire
de Villers Grand Champs, Bénédicte ULg

Book published by Petra (2010)

D’optique philosophique, cet ouvrage est une mise en perspective de deux auteurs que tout semble séparer : Edmond Husserl, père d’une phénoménologie transcendantale de la conscience, et André Leroi ... [more ▼]

D’optique philosophique, cet ouvrage est une mise en perspective de deux auteurs que tout semble séparer : Edmond Husserl, père d’une phénoménologie transcendantale de la conscience, et André Leroi-Gourhan, ethnologue et préhistorien. Une fois opérées les mises au point méthodologiques de rigueur, un dialogue s’établit entre Husserl et Leroi-Gourhan autour des « objets de la préhistoire » : ossements, cailloux taillés, traces d’ocre, de feu, d’habitats, objets gravés ou peints. Procédant par « zigzags », de la phénoménologie à la préhistoire et inversement, Bénédicte de Villers entend se tenir au plus près de la matérialité de ces objets préhistoriques et les décrire. En même temps, ceux-ci s’avèrent les seuls indices de subjectivités humaines d’autrefois et de leurs cultures. L’ambivalence des objets de la préhistoire constitue donc aussi toute leur richesse. L’« ontologie préhistorique » qui se construit dans ces pages, à la croisée des perspectives phénoménologiques et préhistoriques, vise ainsi à poser d’une façon originale la question de la « différence anthropologique » et des origines de l’homme. [less ▲]

Detailed reference viewed: 12 (2 ULg)
See detailHusserl, Twardowski et la question des objets intentionnels
Gyemant, Maria ULg

Conference (2008, May 28)

Detailed reference viewed: 7 (0 ULg)
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See detailHutte ou terrier ?
Libois, Roland ULg

Learning material (2005)

Detailed reference viewed: 12 (2 ULg)
See detailHuwelijksvermogensrecht - Droit des régimes matrimoniaux (art. 1387-1479)
Leleu, Yves-Henri ULg

in Baeteman, G. (Ed.) Edition cumulative du Code civil belge (2004)

Detailed reference viewed: 29 (0 ULg)
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See detailHuy / Ben Ahin : sondage dans l'abri de "Werleu II"
Noiret, Pierre ULg

in Chronique de l'Archéologie Wallonne (2013), 20

Detailed reference viewed: 7 (1 ULg)
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See detailHuy / Ben Ahin : sondage dans le "Grand Abri"
Noiret, Pierre ULg; Flas, Damien ULg

in Chronique de l'Archéologie Wallonne (2013), 20

Detailed reference viewed: 16 (4 ULg)
See detailHuybrechts, Albert
Pirenne, Christophe ULg

in Nouvelle Biographie Nationale (1999)

Detailed reference viewed: 6 (4 ULg)
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See detailHuygens attitude reconstruction based on flight engineering parameters
Perez-Ayucar, Miguel; Sarlette, Alain ULg; Couzin, Patrice et al

Conference (2005, June)

Huygens is ESA’s main contribution to the joint NASA/ESA/ASI Cassini/Huygens mission to Saturn and its largest moon Titan. The Probe, delivered to the interface altitude of 1270 km above the surface by ... [more ▼]

Huygens is ESA’s main contribution to the joint NASA/ESA/ASI Cassini/Huygens mission to Saturn and its largest moon Titan. The Probe, delivered to the interface altitude of 1270 km above the surface by NASA/JPL Cassini orbiter, entered the dense atmosphere of Titan on 14 January 2005 and landed on the surface after a descent under parachute of slightly less than 2.5 hours. Huygens continued to function after landing for more than 3 hours. Data was transmitted and successfully recovered by Cassini continuously during the parachute descent and for 72 minutes on the surface. Although the Huygens attitude reconstruction based on the flight engineering parameters was not foreseen during the development phase (no gyros were included), a rough descent under parachute and indications of an anomaly in the probe spin direction make the engineering dataset valuable in the frame of the ADRS (Huygens Attitude Determination and Reconstruction Subgroup) as a complement to the scientific measurements. In addition, several scientific teams have a strong interest in understanding the orientation of the probe for interpreting their data, as DISR (Descent Imager and Spectral Radiometer) and HASI-PWA (Huygens Atmospheric Structure Instrument-Permeability, Wave and Altimetry). In this paper we describe the engineering parameters used for the Probe attitude reconstruction (Clausen et al., 2002), namely the radio link AGC (Automatic Gain Control), RASU and CASU (Radial and Central Accelerometer Sensor Units) and RAU (Radar Altimeter Unit). We explain the methodology applied to indirectly infer the attitude information from the measurements of these sensors. We also discuss and present the reconstructed information related to attitude: spin rate and azimuthal position (during the atmospheric descent), and landing orientation. Tip and tilt implications are still being worked at the time of writing. Preliminary data on their behavior is presented. [less ▲]

Detailed reference viewed: 46 (1 ULg)
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See detailHuysmans avec Schopenhauer. Le pessimisme d'A rebours
Steinmetz, Rudy ULg

in Romantisme (1988)

Detailed reference viewed: 26 (1 ULg)
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See detailHVDC control strategies to improve transient stability in interconnected power systems
Hazra, Jagabondhu; Phulpin, Yannick; Ernst, Damien ULg

in Proceedings of the 2009 IEEE Bucharest PowerTech (2009)

This paper presents three HVDC modulation strategies to improve transient stability in an interconnected power system. AC variables such as rotor speeds, voltage phasors, and tieline power flows are used ... [more ▼]

This paper presents three HVDC modulation strategies to improve transient stability in an interconnected power system. AC variables such as rotor speeds, voltage phasors, and tieline power flows are used as input to the controller that modifies the power flow settings through the HVDC-links. The proposed techniques are tested on the IEEE 24-Bus reliability test system and critical clearing times obtained for several contingencies are analyzed. The paper shows that HVDC modulation can lead to substantial improvement in transient stability. [less ▲]

Detailed reference viewed: 135 (7 ULg)
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See detailHybrid Acceleration using Real Vector Automata
Boigelot, Bernard ULg; Herbreteau, Frédéric; Jodogne, Sébastien ULg

in Lecture Notes in Computer Science (2003, July), 2725

This paper addresses the problem of computing an exact and effective representation of the set of reachable configurations of a linear hybrid automaton. Our solution is based on accelerating the state ... [more ▼]

This paper addresses the problem of computing an exact and effective representation of the set of reachable configurations of a linear hybrid automaton. Our solution is based on accelerating the state-space exploration by computing symbolically the repeated effect of control cycles. The computed sets of configurations are represented by Real Vector Automata (RVA), the expressive power of which is beyond that of the first-order additive theory of reals and integers. This approach makes it possible to compute in finite time sets of configurations that cannot be expressed as finite unions of convex sets. The main technical contributions of the paper consist in a powerful sufficient criterion for checking whether a hybrid transformation (i.e., with both discrete and continuous features) can be accelerated, as well as an algorithm for applying such an accelerated transformation on RVA. Our results have been implemented and successfully applied to several case studies, including the well-known leaking gas burner, and a simple communication protocol with timers. [less ▲]

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See detailHybrid adaptive observers for locally Lipschitz systems with application to mechanical oscillators
Bobtsov; Efimov, Denis ULg; Pyrkin, Anton

in Proc. IEEE Conf. Control Applications, Saint-Petersburg (2009)

Adaptive observer design procedure is proposed for nonlinear locally Lipschitz systems. Possible presence of disturbances is taken into account. The solution is based on logic-based control approach ... [more ▼]

Adaptive observer design procedure is proposed for nonlinear locally Lipschitz systems. Possible presence of disturbances is taken into account. The solution is based on logic-based control approach applicable to nonlinear systems with bounded solutions. Efficacy of the proposed observer is demonstrated by computer simulation for a mechanical oscil- lating system. [less ▲]

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See detailA hybrid bioregulatory model of angiogenesis during bone fracture healing
Peiffer, Veronique; Gerisch, Alf; Vandepitte, Dirk et al

in Biomechanics & Modeling in Mechanobiology (2011), 10(3), 383-395

Bone fracture healing is a complex process in which angiogenesis or the development of a blood vessel net work plays a crucial role. In this paper, a mathematicalmodel is presented that simulates the ... [more ▼]

Bone fracture healing is a complex process in which angiogenesis or the development of a blood vessel net work plays a crucial role. In this paper, a mathematicalmodel is presented that simulates the biological aspects of fracture healing including the formation of individual blood vessels. The model consists of partial differential equations, several of which describe the evolution in density of the most important cell types, growth factors, tissues and nutrients. The other equations determine the growth of blood vessels as a result of themovement of leading endothelial (tip) cells. Branching and anastomoses are accounted for in the model. The model is applied to a normal fracture healing case and subjected to a sensitivity analysis. The spatiotemporal evolution of soft tissues and bone, as well as the development of a blood vessel network are corroborated by comparison with experimental data. Moreover, this study shows that the proposed mathematical framework can be a useful tool in the research of impaired healing and the design of treatment strategies. [less ▲]

Detailed reference viewed: 27 (9 ULg)
See detailHybrid extended equal-area criterion for fast transient stability assessment with detailed power system models
Zhang, Y.; Rousseaux, Patricia ULg; Wehenkel, Louis ULg et al

in Proceedings of the IFAC Symposium on Control of Power Plants and Power Systems (1995)

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See detailThe Hybrid Finite Element Mixing Cell Method: A New Flexible Method for Modelling Mine Ground Water Problems
Brouyère, Serge ULg; Orban, Philippe ULg; Wildemeersch, Samuel ULg et al

in Mine Water & the Environment (2009), 28(2), 102-114

Dewatering operations often stop at mine closure. The ground water rebound can have undesirable consequences, which numerical models can help one understand and manage. However, classical modelling ... [more ▼]

Dewatering operations often stop at mine closure. The ground water rebound can have undesirable consequences, which numerical models can help one understand and manage. However, classical modelling techniques are relatively unsuitable to these contexts. While spatially-distributed and physically-based models suffer difficulties due to the lack of data and the complexity of geological and hydrogeological conditions, black-box models are too simple to deal with the problems effectively. A new modelling method is proposed to simulate ground water environments in which water flows through mined (exploited) and unmined (unexploited) areas. Exploited zones are simulated using a group of mixing cells possibly interconnected by pipes. Unexploited zones are simultaneously simulated using classical finite elements. This combined approach allows explicit calculation of ground water flows around the mine and mean water levels in the exploited zones. Water exchanges between exploited zones and unexploited zones are simulated in the model using specifically-defined internal boundary conditions. The method is tested on synthetic cases of increasing complexity, and first results from a real case study are presented. [less ▲]

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See detailThe Hybrid Finite-Element Mixing-Cell method: a candidate for modelling groundwater flow and transport in karst systems
Brouyère, Serge ULg; Wildemeersch, Samuel ULg; Orban, Philippe ULg et al

in Bertrand, C.; Carry, N.; Mudry, J. (Eds.) et al Proc. H2Karst, 9th Conference on Limestone Hydrogeology (2011, September)

Groundwater flow and contaminant transport modelling in karst systems remains a challenge because of the complexity of the geology made of caves, voids, conduits of various sizes and forms and interacting ... [more ▼]

Groundwater flow and contaminant transport modelling in karst systems remains a challenge because of the complexity of the geology made of caves, voids, conduits of various sizes and forms and interacting matrix. Such heterogeneous structures cause complex hydraulic conditions for groundwater flow and transport processes. Despite the progresses in field investigation techniques and experiments, detailed knowledge and characterization of the karst system geometry and connectivity remains inaccessible and pragmatic modelling approaches have to be used. Groundwater models of different complexities have been developed for karst systems, ranging from transfer functions and linear reservoir models to spatially distributed models. Here, a new flexible modelling approach, the Hybrid Finite-Element Mixing-Cell method (HFEMC), has been developed that allows combining in a single model, and in a fully interacting way, different mathematical approaches of various complexities for groundwater modelling in complex environments. This includes linear reservoirs, distributed reservoirs, groundwater flow in variably saturated equivalent porous media, with possibilities to consider by-pass flows along preferential flow paths, internal boundary conditions between the karstic features and the surrounding rock mass matrix background and drainage by surface waters. This method has been implemented in the groundwater flow and solute transport numerical code SUFT3D. The objective of this communication is to present the modelling concepts and to discuss the potentials and advantages of the HFEMC method for modelling groundwater flow in karst systems over existing more classical modelling approaches. The discussion is supported by illustrative “synthetic” examples representative of karst systems and a real modelling application to the case of groundwater rebound and water inrush in a closed underground coal mine which presents a very similar geometrical and hydrological context to a karst, with cavities, drains and interacting rock mass. [less ▲]

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See detailThe Hybrid Finite-Element Mixing-Cell method: a new flexible method for large scale groundwater modelling
Orban, Philippe ULg; Brouyère, Serge ULg; Wildemeersch, Samuel ULg et al

Conference (2008)

Interest of end-users and policy makers for understanding and managing water systems at the regional scale has increased for years. At this scale, groundwater models of different complexity ranging from ... [more ▼]

Interest of end-users and policy makers for understanding and managing water systems at the regional scale has increased for years. At this scale, groundwater models of different complexity ranging from black-box models to physically based distributed models have been used in various hydrogeological conditions. Black-box models, such as transfer functions, have been applied for example to model groundwater in large scale hydrological models, to model karstic systems, in particular for the interpretation of isotopic data. Their concepts are simple and attractive because they require relatively few data. The main drawbacks are however that modelling results are not spatially distributed and their predictive capability is questionable due to the semi-empirical nature of process descriptions. On the contrary, due to a more advanced description of ongoing processes, physically-based distributed models are expected to have better predictive capabilities than black-box models. However, because such models require more data, they are generally applied for case studies that are better characterized from a hydrogeological point of view, for which the distribution of water levels or solute concentrations in the groundwater systems are needed. For large-scale modelling purposes, black-box models and physically-based distributed models have both proved their utilities and have their own justifications, advantages and disadvantages. However, few attempts have been made to combine the advantages of these two categories of approaches in a unified modelling application. A new flexible modelling approach, the Hybrid Finite-Element Mixing-Cell method (HFEMC), has been developed that allows combining in a single model, and in a fully integrated way, different mathematical approaches of various complexities for groundwater modelling in complex and large scale environments. This method has been implemented in the groundwater flow and solute transport numerical code SUFT3D. The approach has been first tested and illustrated using basic and advanced “synthetic” examples that allow validating and discussing its advantages over existing modelling concepts. The HFEMC approach is now applied for the development of a large scale groundwater flow and solute transport model in different groundwater basins in Belgium. [less ▲]

Detailed reference viewed: 125 (45 ULg)