Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
See detailApplication of the Wavelet Transform for GPS Cycle Slip Detection and Comparison with Kalman Filter
Collin, Fabienne; Warnant, René ULg; Bruyninx, Carine

Conference (1993)

Detailed reference viewed: 35 (0 ULg)
Full Text
See detailApplication of the X-FEM to the fracture of piezoelectric materials
Béchet, Eric ULg; Scherzer, Matthias; Kuna, Meinhard

Scientific conference (2006)

Materials exhibiting a strong piezoelectric effect may be used in many applications, where they serve as sensors, actuators or transducers. These applications range from for sub-millimeter length scales ... [more ▼]

Materials exhibiting a strong piezoelectric effect may be used in many applications, where they serve as sensors, actuators or transducers. These applications range from for sub-millimeter length scales in MEMs (Micro-Electro-Mechanical Systems) up to large scales in the the design of smart wings in the aerospace industry. As for regular materials subjected to high mechanical stresses, the knowledge of fracture behavior for these smart materials is often crucial within the design of parts under high electrical and mechanical loading. The Extended Finite Element Method [1] has been originally designed for crack growth analysis in isotropic elastic materials. In association with level-sets [2] as a mean for representing the crack geometry, it is a powerful way to get rid of the costly constrained remeshing needed with conventional techniques. Under certain circumstances, this method is also able to achieve regular convergence rates in the energy error even for a cracked domain [3]. Piezoelectric materials exhibit an transversely isotropic mechanical characteristic, as well as a coupling between mechanical and electrical variables. This leads to different near-crack tip mechanical fields and the presence of singularities in the electrical variables [4][5]. To treat this new problem in the X-FEM, specific crack analysis tools and changes in the enrichment functions are needed which allows to represent the crack- both in the mechanical and electrical functional spaces. In this work, we will present these techniques and perform a convergence analysis to ensure that the crack tip behavior is accurately taken into account. Finally, we suggest a simple propagation model for crack growth. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Full Text
Peer Reviewed
See detailApplication of the X-FEM to the fracture of piezoelectric materials
Béchet, Eric ULg; Scherzer, M.; Kuna, M.

in International Journal for Numerical Methods in Engineering (2009), 77(11), 1535-1565

This paper presents an application of the extended finite element method (X-FEM) to the analysis of fracture in piezoelectric materials. These materials are increasingly used in actuators and sensors. New ... [more ▼]

This paper presents an application of the extended finite element method (X-FEM) to the analysis of fracture in piezoelectric materials. These materials are increasingly used in actuators and sensors. New applications can be found as constituents of smart composites for adaptive electromechanical structures. Under in service loading, phenomena of crack initiation and propagation may occur due to high electromechanical field concentrations. In the past few years, the X-FEM has been applied mostly to model cracks in structural materials. The present paper focuses at first on the definition of new enrichment functions suitable for cracks in piezoelectric structures. At second, generalized domain integrals are used for the determination of crack tip parameters. The approach is based on specific asymptotic crack tip Solutions, derived for piezoelectric materials. We present convergence results in the energy norm and for the stress intensity factors, in various settings. Copyright (C) 2008 John Wiley & Sons, Ltd. [less ▲]

Detailed reference viewed: 32 (8 ULg)
Full Text
Peer Reviewed
See detailAPPLICATION OF THE XDS-CALUX BIOASSAY IN ROUTINE: SEMI-QUANTITATIVE SCREENING USING AL-BEQ CUT-OFF VALUES
Vanderperren, H.; Haedrich, J.; Eppe, Gauthier ULg et al

in Organohalogen Compounds (2010)

Detailed reference viewed: 24 (1 ULg)
Full Text
See detailApplication of three entomopathogenic fungi for aphid control
Bawin, Thomas ULg; Seye, Fawrou; Boukraa, Slimane ULg et al

Poster (2013, May 21)

Aphids (Homoptera: Aphididae) are sap-sucking insect pests that feed on several plants of agronomical importance. Chemical pesticide application is the most commonly used method for aphid control. Due to ... [more ▼]

Aphids (Homoptera: Aphididae) are sap-sucking insect pests that feed on several plants of agronomical importance. Chemical pesticide application is the most commonly used method for aphid control. Due to rapid developments of resistance to pesticides and environmental pollution, integrated pest management, including biological control was promoted. In this context, entomopathogenic fungi are valuable tools for potential aphid control since various fungal strains are already commercially available. The present study aims to evaluate and compare the insecticidal activity of two Metarhizium and one Aspergillus strains against Acyrthosiphon pisum aphid. Fungi were cultivated on wheat bran media in flasks up to sporulation. The solid media were washed with aqueous solutions containing 0.05% Tween 80 before filtration. The content of conidia was determined by haemocytometer. Doses ranging from 10^3 to 10^7 conidia/ml were then applied on young plants with 20 adult parthenogenetic aphids. Batches were incubated at a 16L/8D photoperiod, 25±2°C and 75-80% relative humidity. Adult mortality was assessed in order to determine LD50, LD90 and LT50 values, and the number of nymphs produced was daily recorded. Five days after treatment, mortality rates ranged from 30 to 91% depending on the fungal strain and tested dose. Corresponding LD50 and LD90 values were 1.23 x 10^3 and 1.34 x 10^7, 3.67 x 10^3 and 9.71 x 10^7, 4.95 x 10^2 and 5.65 x 10^7 conidia/ml for Metarhizium sp., Metarhizium anisopliae and Aspergillus clavatus respectively. At the higher dose, the LT50 were reached within 2, 4 and 3 days respectively, whereas the LT50 were never reached in the controls. By contrast, the intrinsic growth rates were significantly different from uninfected aphids only in the case of A. clavatus with 10^6 and 10^7 conidia/ml doses five days after exposure. In conclusion, these fungal isolates induced A. pisum mortality with a similar impact and A. clavatus infection appeared to alter the adults’ fitness. This suggests that these fungi may be candidates for aphid control. Further investigations should be made in order to assess their host range specificity. Toxic metabolites leading to death have to be identified and their safety towards non-target organisms confirmed. Finally, their persistence in the environment as well as the compatibility with over means of aphid control must be verified in a view of a broad integrated pest management. [less ▲]

Detailed reference viewed: 119 (24 ULg)
Full Text
See detailApplication of time-dependent convection models to the photometric mode identification in delta Scuti stars
Dupret, Marc-Antoine ULg; Grigahcène, A.; Garrido, R. et al

in Memorie della Società Astronomica Italiana : Journal of the Italian Astronomical Society (2006), 77

We apply the Time-Dependent Convection (TDC) treatment of Gabriel \cite{Gabriel1996} and Grigahcène \cite{Grigahcene} to the mode identification and seismic study of delta Sct stars. We compare the non ... [more ▼]

We apply the Time-Dependent Convection (TDC) treatment of Gabriel \cite{Gabriel1996} and Grigahcène \cite{Grigahcene} to the mode identification and seismic study of delta Sct stars. We compare the non-adiabatic phase-lags obtained with TDC and Frozen Convection (FC) treatments and show that they are very different at the red side of the instability strip. Finally, we compare the phase differences between light and velocity curves observed for the star 1 Mon with the theoretical predictions of TDC and FC models. The much better agreement found with the TDC models enables us to identify the modes of this star with a higher degree of confidency. [less ▲]

Detailed reference viewed: 12 (2 ULg)
Full Text
See detailApplication of time-dependent convection models to the photometric mode identification in gamma Doradus stars
Dupret, Marc-Antoine ULg; Grigahcène, A.; Garrido, R. et al

in Memorie della Società Astronomica Italiana : Journal of the Italian Astronomical Society (2006), 77

We apply the Time-Dependent Convection (TDC) treatment of Gabriel \cite{Gabriel1996} and Grigahcène et al. \cite{Grigahcene} to the photometric mode identification in gamma Dor stars. Comparison of our ... [more ▼]

We apply the Time-Dependent Convection (TDC) treatment of Gabriel \cite{Gabriel1996} and Grigahcène et al. \cite{Grigahcene} to the photometric mode identification in gamma Dor stars. Comparison of our theoretical results with the observed amplitudes and phases of the star gamma Dor is presented. This comparison makes the identification of the degree l of its pulsation modes possible and shows that our TDC models better agree with observations than Frozen Convection (FC) models. [less ▲]

Detailed reference viewed: 14 (3 ULg)
Full Text
Peer Reviewed
See detailApplication of ultrasonography and magnetic resonance imaging in the evaluation of the equine podotrochlear apparatus
Busoni, Valeria ULg

in Annales de Médecine Vétérinaire (2006), 150(Sp. Iss. SI), 10-14

Summary of a PhD thesis including main results

Detailed reference viewed: 19 (10 ULg)
Peer Reviewed
See detailApplication of vectocardiography in cattle
Amory, Hélène ULg; Genicot, B; Rollin, Frédéric ULg et al

in Proceedings of the XVIth World Buiatrics Congress (1992)

Detailed reference viewed: 1 (0 ULg)
See detailApplication of X-ray micro-computed tomography to food products: a study of sugar-snap cookie texture
Pareyt, Bram; Kerckhofs, Greet ULg; Brijs, Kristof et al

Scientific conference (2009)

Detailed reference viewed: 14 (0 ULg)
Full Text
See detailApplication of X-ray microtomography to investigate the effect of raw material properties on the kinetics of iron ores granulation
Evrard, Maxime ULg; Contreras, Rafael; Pirard, Eric ULg

Conference (2014, September)

In modern ironmaking, granulation is the first step of the sintering process. It is typically carried out in continuous drum granulators using water as a binder, and involves multiple components besides ... [more ▼]

In modern ironmaking, granulation is the first step of the sintering process. It is typically carried out in continuous drum granulators using water as a binder, and involves multiple components besides iron ores, such as return fines and other recycled materials (dusts, mill scale, sludges), solid fuel (coke breeze or anthracite) and fluxes (limestone, lime, olivine, dunite or dolomite) (Ball, 1973). As it is necessary to maintain a consistent quality of the granules (size distribution, porosity, strength, etc.) despite of the varying iron ore origins, the question arises as to how the properties of the iron ore particles (size and shape) influence the granulation process. The granulation process is partly influenced by the characteristic of the feed and partly by the action of cohesive force inside the drum granulator (Newitt et al. 1958). The objective of this paper is to study the effect of raw material properties on the kinetics of iron ore granulation considering in particular the mechanisms ruling wet granulation for two iron ores and to know the factors which determine the texture, shape, porosity and mechanical strength of the granules. [less ▲]

Detailed reference viewed: 12 (0 ULg)
Peer Reviewed
See detailApplication of XFEM to image-guided surgery
Vigneron, Lara M.; Duflot, Marc P.; Verly, Jacques ULg et al

Conference (2005)

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailApplication of zeolite minerals as an in-situ amendments for heavy metals polluted soils
Gaydardzhiev, Stoyan ULg; Atanasov, S.

in Pasamehmetoglu and Ozgenoglu (Ed.) Proceedings of SWEMP’98, International Symposium (1998)

Metal fixation from simulated rain water onto zeolite adsorbents has been studies using a column filtration mode. Further on, soil artificially contaminated with heavy metals have been brought into ... [more ▼]

Metal fixation from simulated rain water onto zeolite adsorbents has been studies using a column filtration mode. Further on, soil artificially contaminated with heavy metals have been brought into contact with the zeolites. The loaded adsorbents have been studied via IR spectroscopy wih the aim to reveal the predominant mechanism of metal uptake. [less ▲]

Detailed reference viewed: 25 (2 ULg)
Full Text
See detailAn application pf the mechanics of unsaturated soils to the compaction of oil reservoir rocks due to waterflooding
De Gennaro, Vincenzo; Delage, Pierre; Priol, Grégoire et al

Conference (2005)

Detailed reference viewed: 25 (0 ULg)
Full Text
Peer Reviewed
See detailApplication pratique du concept de charge de travail au sein d'un club de football professionnel
Rodriguez de la Cruz, Carlos ULg; Croisier, Jean-Louis ULg; Vervier, J. et al

in Prévention des troubles musculo-squelettiques chez le sportif (2013)

Detailed reference viewed: 80 (23 ULg)
See detailL'application territoriale des règlements Bruxelles I et Bruxelles II
Partsch, Philippe-Emmanuel ULg

in Espace judiciaire européen, Acquis et enjeux futurs en matière civile (2007)

Detailed reference viewed: 13 (1 ULg)
See detailApplication, à titre pilote, du modèle PEGASE (Planification Et Gestion de l'ASsainissement des Eaux) pour le Grand-Duché de Luxembourg; Plan de Gestion Global des Eaux
Smitz, Joseph ULg; Everbecq, Etienne ULg; Bourouag, Mohamed ULg et al

Report (1997)

Dans le cadre de l’établissement du Plan Général de Gestion des Eaux (PGGE) du Grand-duché de Luxembourg (projet LIFE/PGGE cofinancé par la Communauté Européenne), le Ministère de l’Environnement a décidé ... [more ▼]

Dans le cadre de l’établissement du Plan Général de Gestion des Eaux (PGGE) du Grand-duché de Luxembourg (projet LIFE/PGGE cofinancé par la Communauté Européenne), le Ministère de l’Environnement a décidé de faire réaliser une modélisation globale de la qualité des eaux de surface pour l’ensemble du territoire du Grand-duché de Luxembourg avec le modèle Pegase (« Planification et Gestion de l’Assainissement des Eaux »). Ce rapport reprend la description des tâches concernant la structuration des données de base et l'application à titre pilote de la méthodologie PEGASE au territoire du Grand-duché de Luxembourg. [less ▲]

Detailed reference viewed: 15 (0 ULg)
See detailApplications biomédicales de la RPE
Hoebeke, Maryse ULg

Scientific conference (1999, December)

Detailed reference viewed: 3 (0 ULg)