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Peer Reviewed
See detailDetection and identification of the cytomegalovirus genome in infected cells with labeled DNA probes
Bourdon-Wouters, Christine; Merville, Marie-Paule ULg; Sadzot-Delvaux, Catherine ULg et al

in Archives Internationales de Physiologie et de Biochimie (1987)

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See detailDetection and Localisation of Damage on Industrially Produced Concrete Slabs Through Time- and Frequency-Domain Approaches
Nguyen, Viet Ha; Mahowald, Jean; Golinval, Jean-Claude ULg et al

in Carrera, E; Miglioretti, F; Petrolo, M (Eds.) 6th ECCOMAS Thematic Conference on Smart Structures and Materials (SMART2013) (2013, June)

The objective of this work is to address the problem of damage detection in civil engineering structures using non-destructive techniques and dynamic measurements. To this purpose, time- or frequency ... [more ▼]

The objective of this work is to address the problem of damage detection in civil engineering structures using non-destructive techniques and dynamic measurements. To this purpose, time- or frequency-domain methods are used for the diagnostics. It consists in practical output-only techniques as Stochastic Subspace Identification (SSI) for modal identification or Enhanced Principal Component Analysis (EPCA) for detecting the presence of damage. The use of the Hankel matrix instead of the observation matrix improves effectively the robustness of these methods. Damage localization is based on Frequency Response Functions (FRFs) and sensitivity analysis of PCA results. The efficiency of the above-mentioned methods has been demonstrated in earlier studies mainly on numerical models and small-scale laboratory experiments [3, 4]. It was also tested successfully on industrial examples to perform machine condition monitoring using a reduced set of sensors [2]. In this work, the investigation is performed on precast prestressed and non-prestressed concrete slabs. Successive damages were artificially introduced in the slabs by loading heavy weights and by cutting steel wires, which induced cracks in the structure. The examples show the consequences of the considered techniques for damage identification. The results that are very different between prestressed and non-prestressed slabs may be used as input for the condition control of this kind of structures. [less ▲]

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See detailDetection and modelling of the shear band localisation
Charlier, Robert ULg; Pierry, Joelle

in Proc. of the Int. Conf. on Computational Plasticity, Fundamentals and Applications, COMPLAS (1995, April)

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See detailThe detection and quantification of a digenean infection in the snail host with special emphasis on Fasciola sp.
Caron, Yannick ULg; Rondelaud, Daniel; Losson, Bertrand ULg

in Parasitology Research (2008), 103(4), 735-44

In this review, ten methods used to study digenean infections in their intermediate hosts were compared to determine which one should be used either in the field or in the lab to establish the prevalence ... [more ▼]

In this review, ten methods used to study digenean infections in their intermediate hosts were compared to determine which one should be used either in the field or in the lab to establish the prevalence and intensity of infections in snails. Snail crushing and snail dissection allow quick establishing of prevalence in natural or experimental infections, whereas histology is considered as the most accurate approach to assess the intensity of infection. The follow-up of cercarial shedding only gave an idea on cercarial production. Among recently developed techniques, polymerase chain reaction (PCR) brings the most accurate information and shows high sensitivity and specificity levels when compared to blotting techniques. The easiness and relatively low cost of the basic PCR protocol make it interesting to investigate the epidemiology of the liver fluke in a lab with limited financial resources. Nevertheless, if this technique allows a relatively good estimation of the prevalence, information concerning the intensity of infection is best obtained through real time PCR. However, at the time being this technique is too expensive to be used routinely in the field. The choice between classical or new techniques is usually based on a compromise, as each technique has its advantages and drawbacks. [less ▲]

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See detailDetection and Quantification of Efficiency and Quality of Gait Impairment in Multiple Sclerosis through Foot Path Analysis
PHAN BA, Remy ULg; Pierard, Sébastien ULg; MOONEN, Gustave ULg et al

Poster (2012, October 11)

Introduction: Walking speed is generally considered as the best outcome measure in trials for people with multiple sclerosis (pMS). We recently designed a device based on range laser scanner capable to ... [more ▼]

Introduction: Walking speed is generally considered as the best outcome measure in trials for people with multiple sclerosis (pMS). We recently designed a device based on range laser scanner capable to track feet paths of walking subjects. Our purpose was to explore gait descriptors of pMS and compare them with those of healthy volunteers (HV). Methods: Fourty-four pMS (considered as moderatly or highly disabled according to a cut-off EDSS value of 3.0) and 28 HV performed 4 walking tasks along 2 trajectories in 3 walking modes. Twenty-six gait descriptors crudely dichotomized in « efficiency» and « quality » of gait were compared in the 2 populations using unpaired t-tests. Results: (i) apart from an older age in pMS, the two populations were comparable, (ii) efficiency of gait descriptors including walking speed distinguished HV from pMS, and pMS with moderate from pMS with high disability, (iii) quality of gait descriptors were also significantly altered in pMS, including in walking tasks where their walking speed was comparable to that of HV. Conclusions: RLS technology can distinguish pMS from HV according to (i) more efficiency of gait descriptors than the sole walking speed and (ii) quality of gait descriptors, including in subjects with a « normal » walking speed. [less ▲]

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See detailDetection and quantification of human and bovine novoviruses by a TaqMan RT-PCR assay with a control for inhibition.
Scipioni, Alexandra ULg; Bourgot, Isabelle; Mauroy, Axel ULg et al

in Molecular and Cellular Probes (2008), 22

Noroviruses are single-stranded RNA viruses belonging to the family Caliciviridae. They are a major cause of epidemic and sporadic gastroenteritis in humans and calves. Reverse transcription-polymerase ... [more ▼]

Noroviruses are single-stranded RNA viruses belonging to the family Caliciviridae. They are a major cause of epidemic and sporadic gastroenteritis in humans and calves. Reverse transcription-polymerase chain reaction (RT-PCR) has become the ‘‘gold standard’’ for detection of noroviruses in faecal and environmental samples. However, false negative results due to co-concentration of RT-PCR inhibitors are a continuous concern. A TaqMan real-time RT-PCR assay making use of a foreign internal RNA control and a RNA standard was developed. Very interestingly, this method is capable of detecting human noroviruses belonging to genogroups I and II, and bovine noroviruses belonging to genogroup III. Inhibitors were removed efficiently by 1/10 dilution of the sample or addition of bovine serum albumin to the RT-PCR mix. This assay was validated with human and bovine stool samples previously tested for norovirus by conventional RT-PCR. The ability to detect norovirus in stool samples that were negative by conventional RT-PCR assay demonstrate the higher sensitivity of the TaqMan assay compared to the conventional RT-PCR assay. This real-time RT-PCR assay allows the detection of both human and bovine noroviruses, avoids false negative results and is able to quantify the level of norovirus contamination. [less ▲]

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See detailDetection and quantification of human papillomavirus in benign and malignant parotid lesions.
Descamps, Geraldine; Duray, Anaelle; Rodriguez, Alexandra et al

in Anticancer Research (2012), 32(9), 3929-32

Background/Aim: Human papillomavirus (HPV) is implicated in head and neck squamous cell carcinomas. However, the causal role of HPV in carcinomas of the parotid gland remains uncertain and less documented ... [more ▼]

Background/Aim: Human papillomavirus (HPV) is implicated in head and neck squamous cell carcinomas. However, the causal role of HPV in carcinomas of the parotid gland remains uncertain and less documented. This study aimed to determine the potential implication of HPV in the development of benign and malignant lesions of the parotid gland. MATERIALS AND METHODS: Paraffin-embedded biopsies were obtained from 40 patients with benign parotid gland tumors and from 39 patients with parotid gland carcinomas. The 79 samples were evaluated for the presence of HPV DNA using both GP5+/GP6+ consensus Polymerase Chain Reaction (PCR) and type-specific E6/E7 PCR to detect 18 HPV types. RESULTS: Our results showed a low prevalence of HPV, with only three HPV-positive cases among the 40 benign tumors and one infected carcinoma in the malignant population. CONCLUSION: No association between the presence of HPV DNA and the development of parotid gland tumors was found in our study. [less ▲]

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See detailDetection and quantification of non-linear dynamic behaviour of space structures
Hot, A.; Kerschen, Gaëtan ULg; Cogan, S. et al

in 28th International Modal Analysis Conference, Jacksonville, 2010 (2010)

Detailed reference viewed: 23 (1 ULg)
See detailDetection and quantification of non-linear dynamic behaviour of space structures
Hot, A.; Cogan, S.; Foltete, E. et al

in 11th European Conference on Spacecraft Structures, Materials and Mechanical Testing, Toulouse, 2009 (2009)

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See detailDetection and quantification of non-linear structural behavior using principal component analysis
Hot, A.; Kerschen, Gaëtan ULg; Foltete, E. et al

in Mechanical Systems & Signal Processing (2011), 26

The detection of non-linear behavior in structural dynamics is a very important step to the extent that the presence of non-linearities, even local, can affect the global dynamic behavior of a structure ... [more ▼]

The detection of non-linear behavior in structural dynamics is a very important step to the extent that the presence of non-linearities, even local, can affect the global dynamic behavior of a structure. A large number of techniques that enable engineers to detect non-linear behavior can be found in the literature but most of these methods exploit frequency domain data and give better results with a stepped-sine excitation. The goal of this paper is to propose an alternative methodology that is based on the principal component analysis and uses time responses obtained with a random excitation. Two criteria will be used to quantify the difference between two response subspaces, based on the angle between them and the residual error resulting from the projection of one on the other. The concept of limit of linearity and design decision margins is also addressed in this paper. The methodology is demonstrated using an academic simulated system and then using measured data of a simplified solar array system. [less ▲]

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See detailDetection and regulation of natriuretic and Na-K ATPase inhibitor activities in the plasma of normotensive subjects
Krzesinski, Jean-Marie ULg; Potier, J. P.; Godon, J. P. et al

in Clinical & Experimental Hypertension (1987), A9(11), 1908

Detailed reference viewed: 8 (4 ULg)
Peer Reviewed
See detailDetection and use of single gene effects in large animal populations
Gengler, Nicolas ULg; Abras, S.; Szydlowski, M. et al

in Journal of Dairy Science (2007), 90(Suppl. 1), 376-376

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See detailDétection automatique de glomérules en pathologie digitale
Marée, Raphaël ULg; Jean-Christophe, Olivo-Marin; Vannary, Meas-Yedid

Scientific conference (2015, September 08)

Dans cet article, nous proposons une méthodologie de détection de glomérules au sein d’images de biopsies rénales. Elle combine des techniques de traitement d’images et d’apprentissage supervisé. Nous ... [more ▼]

Dans cet article, nous proposons une méthodologie de détection de glomérules au sein d’images de biopsies rénales. Elle combine des techniques de traitement d’images et d’apprentissage supervisé. Nous évaluons l’approche sur des images présentant plusieurs sources de variations et montrons que les comptages automatiques sont très bien corrélés avec les comptages des experts [less ▲]

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See detailDétection automatique de réminiscences potentielles de Xénophon chez Arrien
Vanhaegendoren, Koen ULg; Vandersmissen, Marc ULg

in Etudes Classiques (Namur, Belgium) (2014)

Depuis des siècles, les spécialistes et les savants des littératures grecque et latine se sont attachés à repérer les citations et les reprises d’un auteur chez un autre en raison de l’importance de ... [more ▼]

Depuis des siècles, les spécialistes et les savants des littératures grecque et latine se sont attachés à repérer les citations et les reprises d’un auteur chez un autre en raison de l’importance de l’imitatio et de l’aemulatio dans le processus de création littéraire des œuvres anciennes. Arrien de Nicomédie en est un parfait exemple puisqu’il s’inspira abondamment de son modèle admiré, Xénophon. C’est pourquoi, après avoir répertorié le plus grand nombre possible de réutilisations déjà mises au jour entre les deux historiens par les philologues de manière livresque, notre projet a pour but de détecter et de commenter de nouvelles réminiscences potentielles de Xénophon dans l’œuvre d’Arrien grâce à un logiciel développé spécifiquement à l’Université de Liège sur base de fichiers de textes lemmatisés en collaboration avec le LASLA. [less ▲]

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See detailDétection automatique des changements du bâti à partir des images satellitaires à haute résolution spatiale et des données cartographiques existantes.
El Mansouri, Loubna ULg

Doctoral thesis (2014)

La révision des données cartographiques (DC) est un processus réalisé actuellement d'une manière entièrement manuelle en cherchant les changements entre la donnée existante et une image plus récente ou ... [more ▼]

La révision des données cartographiques (DC) est un processus réalisé actuellement d'une manière entièrement manuelle en cherchant les changements entre la donnée existante et une image plus récente ou carrément par une nouvelle cartographique du territoire comme le cas au Maroc. La tâche étant lourde, lente et coûteuse, de nombreux travaux sont menés pour l'automatiser. L'idée développée dans plusieurs agences de cartographie collaborativement avec des institutions de recherche est d'adopter un mode de mise à jour semi automatique, où des procédures de détection automatique de changements sont mises en place pour extraire les zones de changement potentielles et les présenter à un technicien cartographe pour les valider avant de les intégrer à la DC à mettre à jour. Dans cette thèse, nous nous focalisons sur la détection des changements du bâti par comparaison automatique d'une carte numérique (CN) existante à une image satellitaire à haute résolution spatiale (HRS) plus récente, en vue d'une mise à jour semi automatique. L'approche proposée décompose le processus de détection de changements en deux étapes. Dans la première, les bâtiments sont extraits de l'image en se basant sur la classification de l'image pré-segmentée. Nous avons utilisé conjointement les avancées en algorithmes de classification d'images et les connaissances dérivées de la carte et des relations entre les objets urbains afin de s'affranchir des difficultés liées à l'extraction d'objets à partir d'images à HRS. Les objets de la carte sont intervenus à plus d'un niveau pour soutenir et automatiser l'extraction. Dans la seconde étape, la couche de bâtiments extraits est comparée à l'ancienne couche de bâtiments pour déduire les changements à l'échelle du "bâtiment". Ces changements représentent les mises à jour à valider par le technicien avant de les intégrer dans la carte. Nous illustrons l'efficacité de notre approche par des expériences menées avec une carte et une image QuickBird de la ville de Rabat au Maroc, qui connait depuis la dernière décennie une forte extension urbaine au détriment des zones de végétation. [less ▲]

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See detailDétection automatique des textes épistolaires du corpus néo-égyptien : méthodes exploitant la récurrence de motifs discriminants
Gohy, Stéphanie ULg; Martin Leon, Benjamin ULg

in Dister, Anne; Longrée, Dominique; Purnelle, Gérald (Eds.) Actes des 11es Journées internationales d'Analyse statistique des Données Textuelles (2012)

In this paper, we will develop two methods allowing an automatic detection of the Late-Egyptian epistolary genre. Among the criteria which could be mobilized to identify different genres within a corpus ... [more ▼]

In this paper, we will develop two methods allowing an automatic detection of the Late-Egyptian epistolary genre. Among the criteria which could be mobilized to identify different genres within a corpus, the study of “motifs” (“patterns”) represents a particularly promising approach that has already been successfully exploited for a corpus of Latin texts. In our communication, we suggest applying this process to the Late Egyptian corpus, and more particularly to the epistolary genre. Two methods will be applied to our corpus to identify whether or not particular documents belong the epistolary genre. We shall begin by explaining the principle of functioning of these two methods. The results obtained will then be analyzed; we shall try to understand why certain documents were improperly classified. [less ▲]

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See detail- Détection automatique des textes épistolaires du corpus néo-égyptien : méthodes exploitant la récurrence de motifs discriminants
Gohy, Stéphanie ULg; Martin Leon, Benjamin ULg

in Purnelle, Gérald; Longrée, Dominique; Dister, Anne (Eds.) Actes des 11es Journées internationales d'Analyse statistique des Données Textuelles (2012, June 15)

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See detailDetection by immunodiffusion tests and radioimmunoassay of antibodies to bovine leukemia virus antigens in sera of experimentally infected sheep and cattle.
Mammerickx, Marc; Portetelle, Daniel ULg; Burny, Arsène et al

in Markson, L. M. (Ed.) CEC Scientific Wokshop on Bovine Leukemia (1980)

Detailed reference viewed: 9 (1 ULg)