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See detailDesign of a spherical array of microphones for room acoustics applications.
Feron, Hermine; Embrechts, Jean-Jacques ULg

Conference (2014, May 28)

Detailed reference viewed: 38 (4 ULg)
See detailDesign of a sprayer that makes CE-ESI-MS easy and robust
Far, Johann ULg; De Pauw, Edwin ULg; Falmagne, Jean-Bernard et al

Conference (2014, May 28)

Presentation of a CEMS interface design for easy and robust coupling of Capillary Electrophoresis with Mass Spectrometry equipped with a nanospray source. Principles and specification were presented.

Detailed reference viewed: 47 (1 ULg)
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See detailDesign of a Stable Lagrange Multiplier Space for Stiff Boundary Conditions
Béchet, Eric ULg; Moës, Nicolas; Wohlmuth, Barbara

in Zilian, A.; Fries, T. P. (Eds.) International Conference on Extended Finite Element Methods – Recent Developments and Applications XFEM 2009 (2009)

We introduce a new algorithm to define a stable Lagrange multiplier space to impose stiff interface conditions within the context of the eXtended Finite Element Method. In contrast to earlier approaches ... [more ▼]

We introduce a new algorithm to define a stable Lagrange multiplier space to impose stiff interface conditions within the context of the eXtended Finite Element Method. In contrast to earlier approaches, we do not work with an interior penalty formulation as, e.g., for Nitsche techniques, but impose the constraints weakly in terms of Lagrange multipliers. The new algorithm allows a local construction of the Lagrange multiplier space while improving the accuracy of the computed fields. The originality of this approach with regard to former approaches lies in the use of the trace of primary shape functions defined on the domain, and a simplified procedure to define the mesh on the interface. Moreover, the newly constructed Lagrange multiplier space satisfies, in contrast to the naive approach, a uniform inf-sup condition. [less ▲]

Detailed reference viewed: 87 (19 ULg)
See detailDesign of a stable LM space for stiff boundary conditions and interfacial constraints
Béchet, Eric ULg

Scientific conference (2008, October)

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See detailDesign of a versatile device for measuring whole plant gas exchanges in Arabidopsis thaliana
Tocquin, Pierre ULg; Périlleux, Claire ULg

in New Phytologist (2004), 162(1), 223-229

Because of its small size and rosette growth habit, measuring gas exchanges in Arabidopsis thaliana is difficult with standard leaf cuvettes. Here, we designed a versatile system that is usable at the ... [more ▼]

Because of its small size and rosette growth habit, measuring gas exchanges in Arabidopsis thaliana is difficult with standard leaf cuvettes. Here, we designed a versatile system that is usable at the whole rosette level, as small as possible for fast and accurate measurements, but adaptable to plant size, and suitable for in situ measurements whatever the growing substrate of the plant. This cuvette is in two parts: the basic unit, which contains the sensors and is connected to the infra-red gas analyzer, and the clear chamber, where the rosette is enclosed. We made a set of three interchangeable chambers of different sizes to measure the rate of CO2 assimilation [A] of 26-, 33- and 40-d-old plants. The dependence of A to light irradiance and to intercellular CO2 concentration was recorded as typical response curves, which validate our device. Measurements were not only consistent in saturating conditions, but accurate CO2 exchange measurements in limiting conditions also reflected important physiological features related to plant ageing. [less ▲]

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See detailDesign of a watercourse and riparian strip monitoring system for environmental management
Debruxelles, N.; Claessens, Hugues ULg; Lejeune, Philippe ULg et al

in Environmental Monitoring & Assessment (2009), 156

Watercourses are complex ecosystems where numerous economic, ecological and heritage issues converge. To ensure their efficient management it is essential to have a full description of these ... [more ▼]

Watercourses are complex ecosystems where numerous economic, ecological and heritage issues converge. To ensure their efficient management it is essential to have a full description of these multifunctional ecosystems and to know their evolution over time. This paper describes a method for monitoring watercourses and their riparian strips developed in Wallonia (southern Belgium). It is based on an inventory constructed by stratified random sampling comprising 1,071 sampling plots distributed over a total length of 24,600 km of watercourses covered from their source. Each sampling plot is surveyed and measurements and fine observations are made on watercourse segments 50 m long. The method developed, which was applied on a regional scale, could easily be transposed to other entities, from large river basins, to an entire country. Examples of results obtained from a first inventory phase demonstrate the utility of this tool designed to supply qualitative and quantitative information to assist watercourse management. [less ▲]

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See detailDesign of an AC susceptometer based on a cryocooler
Vanderbemden, Philippe ULg

in Cryogenics (1998), 38(8), 839-842

This paper describes a simple and low-cost experimental setup intended for low temperature measurements under a time-dependent magnetic field. A typical application of this system is the determination of ... [more ▼]

This paper describes a simple and low-cost experimental setup intended for low temperature measurements under a time-dependent magnetic field. A typical application of this system is the determination of A.C. susceptibility and flux profiles of high-T-c superconductors. The A.C. magnetic field is generated by a sheeted iron-cored electromagnet. The device is based on a commercial closed-cycle helium refrigerator. A sample holder made of a polycrystalline silicon rod is shown to establish a good thermal contact between the sample and the cold head; it allows temperatures down to 20 K to be achieved. Experimental details are described and illustrative measurements on high-T-c superconductors are included. The performances and limitations of this system are discussed. (C) 1998 Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailDesign of an Algebraic Neural Operating System in Programmable Logical Controller for Simulation and Execution of Sequential Operations
Dubois, Daniel ULg; Mascia, Antonio

in International Journal of Computing Anticipatory Systems [=IJCAS] (2010), 25

This paper deals with a general method for the analysis and the logical generation of discrete systems in Programmable Logical Controller (PLC). The Boolean operators are implemented with a generic and ... [more ▼]

This paper deals with a general method for the analysis and the logical generation of discrete systems in Programmable Logical Controller (PLC). The Boolean operators are implemented with a generic and unique algebraic model as event-dependent discrete equations, which can be executed in a sequential order. With this method, a generator of sequential logical tables can be designed, simulated and executed for implementing discrete dynamical systems. Two applications are studied. The first application deals with the industrial automation of a water supply for a factory. From the logical table of the events, an algebraic model is designed with a set of discrete equations. From these digital equations, a neural network of the water supply is built. The second application deals with an industrial traveling wagon. [less ▲]

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See detailDesign of an axial mechanical gas seal with self-acting lift geometry
DOCQUIER, N.; NELIS, M.; Bozet, Jean-Luc ULg

in European Journal of Mechanical and Environmental Engineering [=EJMEE] (1998), 43(no4), 195-203

Cet article étudie le comportement d'un joint mécanique sans contact à faces radiales, doté d'un dispositif d'augmentation de portance. La répartition des pressions et des vitesses dans le film mince est ... [more ▼]

Cet article étudie le comportement d'un joint mécanique sans contact à faces radiales, doté d'un dispositif d'augmentation de portance. La répartition des pressions et des vitesses dans le film mince est établie grâce à l'équation de Reynolds résolue au moyen de différences finies. L'étude paramétrique des caractéristiques du joint est ensuite réalisée en vue d'en déduire des abaques de fonctionnement et, par la suite, une démarche cohérente de choix des dimensions. L'auteur présente donc tout d'abord le fonctionnement d'un joint mécanique à gaz et il en décrit la géométrie et les conditions de travail. Après avoir défini et justifié les hypothèses utilisées, il propose une mise en équation du problème et décrit le comportement du système d'étanchéité en régime au moyen des résultats obtenus. L'article présente finalement l'influence de la géométrie du joint et propose une méthode de dimensionnement. [less ▲]

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See detailDesign of an electronic interface for levitated disk accelerometer
Gindila, M.V.; Kraft, Michael ULg

in Proc. of the Symposium on Electronics and Telecommunications Etc. (2002, September)

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See detailDesign of an ELISA specific for the measurement of equine neutrophil myeloperoxidase in biological fluids
Couderc, S.; Franck, Thierry ULg; Bougoussa, M. et al

in Clinical Chemistry (2005), 51(Suppl. 6), 211-212

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See detailDesign of an implantable micropump
Smal, Olivier; Merken, Patrick; Croquet, Vincent et al

in Proceedings of the International Precision Assembly Seminar (2004, February)

The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are ... [more ▼]

The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are limited by their rather expensive cost. The challenge is therefore to develop a low cost alternative by reducing the number of parts and by simplifying the assembly. As the pump and its tank will be placed under the skin in order to increase comfort, such a system should be small and reliable. In this paper, we present the micropump we developed within the framework of the 4M-µ pump interuniversity project (Methods and Means for the Miniaturization of Machines). [less ▲]

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See detailDesign of an oceanographic data base
Muller, Fabrice; Donnay, Jean-Paul ULg; De Cauwer, Karien et al

in CoastGIS’99- Geomatics and coastal environment (2000)

Detailed reference viewed: 20 (4 ULg)
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See detailDesign of an ultra-sensitive MEMS force sensor utlizing mode localisation in weakly coupled resonators
Zhao, C; Wood, GS; Suan, SH et al

in Proceedings of "Micromechanics and Microsystems Europe Workshop: Allemagne - 2012" (2012)

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See detailDesign of an uncertain prestressed space structure: an info-gap approach
Hot, A.; Cogan, S.; Foltete, E. et al

in Proceedings of the 30th International Modal Analysis Conference (2012)

Uncertainty quantification is an integral part of the model validation process and is important to take into account during the design of mechanical systems. Sources of uncertainty are diverse but ... [more ▼]

Uncertainty quantification is an integral part of the model validation process and is important to take into account during the design of mechanical systems. Sources of uncertainty are diverse but generally fall into two categories: aleatory uncertainties due to random processes and epistemic uncertainty resulting from a lack of knowledge or erroneous assumptions. This work focuses on the impact of uncertain levels of prestress on the behavior of solar arrays in their stowed configuration. In this context, snubbers are inserted between two adjacent panels to maintain contact and absorb vibrations during launch. However, under high excitation loads, a loss of contact between the two panels may occur. This results in impacts that can cause extensive damages to fragile elements. In practice, the specific load configuration for which the separation of the two panels occurs is difficult to determine precisely since the exact level of prestress applied to the structure is unknown. An info-gap robustness analysis is applied to study the impact of this lack of knowledge on the prestress safety factor required to avoid loss of contact. The proposed methodology is illustrated using a simplified model of a solar array. [less ▲]

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See detailDesign of an undervoltage load shedding scheme for the Hydro-Québec system
Lefebvre, Daniel; Moors, Cédric; Van Cutsem, Thierry ULg

(2003, July)

This paper deals with the control logic of an undervoltage, closed-loop load shedding scheme aimed at protecting the Hydro-Quebec system against long-term voltage instability. This scheme relies on a set ... [more ▼]

This paper deals with the control logic of an undervoltage, closed-loop load shedding scheme aimed at protecting the Hydro-Quebec system against long-term voltage instability. This scheme relies on a set of "if-then" rules whose parameters are determined through combinatorial optimisation, relying on the system dynamic response over a set of scenarios. Preliminary results of the above optimisation technique are given, besides a brief description of the foreseen implementation. [less ▲]

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See detailDesign of Analysis Modules
Papadimitriou, Dimitri; Ben Houidi, Z.; Ghamri-Doudane et al

Report (2013)

This public deliverable describes the design and specification of a first set of basic analysis modules for addressing the use cases identified in WP1. The document focuses on the required algorithms ... [more ▼]

This public deliverable describes the design and specification of a first set of basic analysis modules for addressing the use cases identified in WP1. The document focuses on the required algorithms, which use as input the measurements and analysis provided by the lower layers (WP2 and WP3) of the mPlane architecture to provide more advanced analysis and answers towards the resolution of the problem addressed by the use case. These analysis modules include both stream and batch processing algorithms and address issues such as classifications, estimations, predictions, detections, correlations and diagnosis. [less ▲]

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See detailDesign of antibacterial surfaces by a combination of electrochemistry and controlled radical polymerization
Voccia, Samuel; Ignatova, Miléna; Jérôme, Robert ULg et al

in Langmuir (2006), 22(20), 8607-8613

In this paper we report a new method for the electrochemical deposition of a metal/polymer composite layer on a conducting substrate. The electrochemical solution is a mixture of an acrylate (ethyl ... [more ▼]

In this paper we report a new method for the electrochemical deposition of a metal/polymer composite layer on a conducting substrate. The electrochemical solution is a mixture of an acrylate (ethyl acrylate, EA; 2-phenyl-2-(2,2,6,6-tetramethylpiperidin-1-yloxy)ethyl acrylate, PTEA; 8-quinolinyl acrylate, 8QA), a metallic salt (silver(I) acetate), and a conducting salt in dimethylformamide. The process has been first studied with EA as the polymer precursor and then extended to PTEA and 8QA, respectively, with the purpose to prepare antibacterial surfaces. The final coating has been characterized by attenuated total reflection Fourier transform infrared spectroscopy, energy-dispersive X-ray analysis, environmental scanning electron microscopy, and atomic force microscopy. All the silver-containing coatings were effective against Gram-negative bacteria Escherichia coli. Bacteria Staphylococcus aureus could not adhere to the Ag-0/polyacrylate films deposited on stainless steel. [less ▲]

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See detailDesign of beam-columns in steel sway frames: from the actual member to a simply supported equivalent one
Hansoulle, T.; Boissonnade, N.; Goncalves, R. et al

in Proceedings of the 2007 Annual Technical Stability Conference, Structural Steel Research Council (2007)

Detailed reference viewed: 52 (4 ULg)