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See detailDevelopment of a compartment model based on CFD simulations for mixing description in bioreactors
Delafosse, Angélique ULg; Delvigne, Frank ULg; Collignon, Marie-Laure ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(2), 517-522

Understanding and modelling the complex interactions between biological reaction and hydrodynamics is a key problem when dealing with bioprocesses. It is fundamental to be able to accurately predict the ... [more ▼]

Understanding and modelling the complex interactions between biological reaction and hydrodynamics is a key problem when dealing with bioprocesses. It is fundamental to be able to accurately predict the hydrodynamics behaviour of bioreactors of different size and its interaction with the biological reaction. CFD can provide detailed modelling about hydrodynamics and mixing. However, it is computationally intensive, especially when reactions are taken into account. Another way to predict hydrodynamics is the use of "Compartment" or "Multi-zone" model which are much less demanding in computation time than CFD. However, compartments and fluxes between them are often defined by considering global quantities not representative of the flow. To overcome the limitations of these two methods, a solution is to combine compartment modelling and CFD simulations. Therefore, the aim of this study is to develop a methodology in order to propose a compartment model based on CFD simulations of a bioreactor. The flow rate between two compartments can be easily computed from the velocity fields obtained by CFD. The difficulty lies in the definition of the zones in such a way they can be considered as perfectly mixed. The creation of the model compartments from CFD cells can be achieved manually or automatically. The manual zoning consists in aggregating CFD cells according to the user's wish. The automatic zoning defines compartments as regions within which the value of one or several properties are uniform with respect to a given tolerance. Both manual and automatic zoning methods have been developed and compared by simulating the mixing of an inert scalar. For the automatic zoning, several algorithms and different flow properties have been tested as criteria for the compartment creation. [less ▲]

Detailed reference viewed: 95 (33 ULg)
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See detailDevelopment of a contact model adapted to incremental forming
Henrard, Christophe ULg; Bouffioux, Chantal ULg; Godinas, A. et al

in Banabic, D. (Ed.) Proceedings of the 8th ESAFORM Conference on Material Forming (2005)

The objective of this article is to present the development of a new method for taking into account the contact between the tool and the blank during incremental forming. First, the need for such a model ... [more ▼]

The objective of this article is to present the development of a new method for taking into account the contact between the tool and the blank during incremental forming. First, the need for such a model is justified. Then, the basic features of the adapted dynamic explicit scheme are presented, followed by the new algorithms proposed and their programming. Finally, some conclusions and perspectives are drawn. [less ▲]

Detailed reference viewed: 77 (7 ULg)
Peer Reviewed
See detailDevelopment of a cost calculation module for the inland and sea-river waterway transport
Marchal, Jean ULg; Kicheva, D.

in Proceedings of the PIANC Conference on Inland and Maritime navigation and Coastal Problems of East European Countries (1996, September)

Detailed reference viewed: 12 (0 ULg)
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See detailDevelopment of a Cough Induction Test in Pigs: Effects of Sr 48968 and Enalapril
Moreaux, B.; Beerens, Dominique ULg; Gustin, Pascal ULg

in Journal of Veterinary Pharmacology & Therapeutics (1999), 22(6), 387-389

Detailed reference viewed: 22 (0 ULg)
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See detailDevelopment of a coupled flow and transport 3D model for simulating seawater intrusions in coastal aquifers
Carabin, Guy; Dassargues, Alain ULg

in Natuurwetenschappelijk Tijdschrift (1999), 79

Detailed reference viewed: 27 (5 ULg)
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See detailDevelopment of a database linked to a GIS for coupling with groundwater modelling tools
Ruthy, Ingrid ULg; Orban, Philippe ULg; Gogu, Radu Constantin et al

in Iu (Ed.) Computational Methods in Engineering and Science (2003)

Groundwater analysis strongly depends on the availability of large volumes of high-quality data. Putting all data in a coherent and logical structure supported by a computing environment helps ensure ... [more ▼]

Groundwater analysis strongly depends on the availability of large volumes of high-quality data. Putting all data in a coherent and logical structure supported by a computing environment helps ensure validity and availability and provides a powerful tool for hydrogeological studies. A hydrogeological Geographical Information System (GIS) database that offers facilities for hydrogeological modeling has been designed in Belgium for the Walloon Region. Interest is growing in the potential for integrating GIS technology and groundwater simulation models. A “loose-coupling” tool was created between the spatial database scheme and the groundwater numerical model interface GMS© (Groundwater Modeling System). Following time and spatial queries, the hydrogeological data stored in the database can be easily used within different groundwater numerical models. [less ▲]

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See detailDevelopment of a Database System for the Management of Borehole Data : Experience and lessons
Halleux, Isabelle ULg

in Mathematical Geology (1994), 26(7), 833-841

CBS-LOG is a multilingual database system for the management of coal exploratory borehole data. It is a dBase application running on PC's with minimum configurations. Developing a suitably accurate ... [more ▼]

CBS-LOG is a multilingual database system for the management of coal exploratory borehole data. It is a dBase application running on PC's with minimum configurations. Developing a suitably accurate database requires some stratégic choices and lots of discussions and compromises between experts. The experience shows that it is absolutely necessary to follow strictly the development flow-sheet and that the difficulties rely mainly on communication and human aspects of mathematical geology. A step by step approach is reviewed in terms of experience and lessons. [less ▲]

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See detailDevelopment of a decision support system for setting up a wind energy policy across the Walloon Region (southern Belgium)
Lejeune, Philippe ULg; Feltz, Claude ULg

in Renewable Energy : An International Journal (2008), 33

Wallonia (the region covering southern Belgium) is committed to making a significant increase in its wind-powered electricity production capacity by 2010. Therefore, a decision support system designed to ... [more ▼]

Wallonia (the region covering southern Belgium) is committed to making a significant increase in its wind-powered electricity production capacity by 2010. Therefore, a decision support system designed to evaluate and map environmental and landscape constraints fundamental to the building of wind farms was developed for the whole Walloon Region (17,000 km2). This system is a geodatabase using 40 criteria (landscape or environmental) corresponding to three constraint levels (exclusion, highly sensitive and sensitive). This geodatabase also has analysis functions developed in the ArcGIS 9 software environment that are used to update the overall constraints map, to analyse sensitivity with respect to constraint criteria-defining parameters as well as to perform full diagnostic studies on wind farm projects. [less ▲]

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See detailDevelopment of a decision-making tool to manage forest storm damage in the Walloon Region (Belgium)
Riguelle, Simon ULg; Jourez, Benoît ULg; Hebert, Jacques ULg

Poster (2008, June 03)

When an unexpected windthrow event occurs, the extent of damage may rapidly increase to reach a crisis level. Therefore, it requires a suitable and fast reaction by the public authorities and the ... [more ▼]

When an unexpected windthrow event occurs, the extent of damage may rapidly increase to reach a crisis level. Therefore, it requires a suitable and fast reaction by the public authorities and the concerned owners as well as by the whole sector of wood transformation. The aim of this research, which is a regional priority, relates to the realization of a decision-making tool thought not under the constraint of the urgency, when trees are lying down on the ground, but established on the basis of real dramatic cases already experienced in the past. The tool is dedicated to political and administrative services but, to be effective, calls upon a broad collaboration with all the partners of the wood sector. [less ▲]

Detailed reference viewed: 17 (7 ULg)
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See detailDevelopment of a didactic SPH model
Goffin, Louis ULg

Master's dissertation (2013)

The SPH method (smoothed particle hydrodynamics) is a numerical meshless, particle and Lagrangian method. It is used in a lot of fields of engineering, such as solids mechanics, hydraulics and ... [more ▼]

The SPH method (smoothed particle hydrodynamics) is a numerical meshless, particle and Lagrangian method. It is used in a lot of fields of engineering, such as solids mechanics, hydraulics and astrophysics. The medium is represented thanks to a set of particles that have an influence on each other. First of all, the positioning of the method is discussed. The SPH method is compared to some existing numerical methods. Its advantages and drawbacks are introduced. Its particle, meshless and Lagrangian characteristics are compared to other existing methods. The basics of the method are explained through the integral representation of a function and the particle approximation. Moreover, some smoothing functions are analysed. The SPH method being Lagrangian, the Navier-Stokes equations must be written in the Lagrangian formalism. After this, the SPH method can be applied to the equations of continuity and of conservation of momentum. Some practical issues linked to the SPH method such as the neighbours search, the equations of state or the boundary conditions are discussed. Then, the practical implementation of the method and of the chosen options is explained in details. An object-oriented programming was chosen for its advantages in comparison to a classical sequential implementation. Finally, the implemented program is tested and commented. Its advantages are highlighted and its drawbacks are discussed and explained. There are a lot of test cases presented. They include some validation tests (dam breaks, particles fall, etc.), some test cases used to compare the options of the program and other tests present the possibilities of the code. [less ▲]

Detailed reference viewed: 247 (34 ULg)
See detailDevelopment of a Diesel Substitute Fuel
Reiter, A M; Mair-Zelenka, P; Wallek, T et al

in 9th International Colloquium Fuels - Conventional and Future Energy for Automobiles (2013)

Detailed reference viewed: 10 (0 ULg)
Peer Reviewed
See detailDevelopment of a digital accelerometer for low-frequency structural vibration measurement
Kraft, Michaël ULg; Lewis, Christopher P.; Hesketh, Thomas G.

in The 1996 Sensor and Transducer Conference Proceedings (1996)

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailThe development of a digital accelerometer
Lewis, Christopher P.; Kraft, Michaël ULg; Hesketh, Thomas G.

in Proceedings 27th ISATA - International Symposium on Automotive Technology and Automation (1994)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailDevelopment of a Dynamic 3-D Nonlinear Computer Program
Fonder, Ghislain ULg; Charlier, Robert ULg; Habraken, Anne ULg et al

in Convention Européenne de la Construction métallique (1986)

Detailed reference viewed: 39 (4 ULg)
Peer Reviewed
See detailDevelopment of a dynamic guidance model for car drivers in the city center of Liège, Belgium.
Marchal, Jean ULg; Ndiaye, Alassane-Ballé ULg

in Proceedings of the INFORMS Montreal Spring meeting 1998 (1998)

Detailed reference viewed: 12 (1 ULg)
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See detailThe development of a European questionnaire for quality of life in patients with vertebral osteoporosis
Lips, P; Agnusdei, D; Caulin, F et al

in Scandinavian Journal of Rheumatology (1996), 25(103), 84-85

Detailed reference viewed: 5 (2 ULg)
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See detailDevelopment of a field test to evaluate colostral immunity transfer in young calves
Guyot, Hugues ULg; Dubreucq, Pierre ULg; Lebreton, Pascal et al

Poster (2015, June)

Failure of transfer of immunity from dam’s colostrum generates a negative effect on calves’ health leading to increased morbidity and mortality (De Nise et al., 1989; Wittum and Perino, 1995). Unawareness ... [more ▼]

Failure of transfer of immunity from dam’s colostrum generates a negative effect on calves’ health leading to increased morbidity and mortality (De Nise et al., 1989; Wittum and Perino, 1995). Unawareness of the colostral quality and variation in the calf’s capability to efficiently absorb immunoglobulins (IgG) supports the need for specific evaluation of the immunity transfer at a herd level. The aim of the study was to evaluate the performances of a field test for passive immunity transfer (PIT) in calves. [less ▲]

Detailed reference viewed: 37 (2 ULg)
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See detailDevelopment of a field test to evaluate colostrum quality (IgG) in cattle
Guyot, Hugues ULg; Dubreucq, Pierre ULg; Lebreton, Pascal et al

Poster (2015, June)

Failure of transfer of immunity from dam’s colostrum generates a negative effect on calves’ health leading to increased morbidity and mortality (De Nise et al., 1989; Wittum and Perino, 1995 ... [more ▼]

Failure of transfer of immunity from dam’s colostrum generates a negative effect on calves’ health leading to increased morbidity and mortality (De Nise et al., 1989; Wittum and Perino, 1995). Immunoglobulins (IgG) content of colostrum is highly variable and cannot be predicted. Distinguishing good from poor quality colostrum allows to adapt the volume administered or to initiate ancillary procedures for a sufficient transfer of IgG. The aim of the study was to evaluate the performances of a field test for colostrum quality determination. [less ▲]

Detailed reference viewed: 50 (1 ULg)