Contribution à l'étude des effets psychologiques, psychophysiologiques et neuro-endocriniens de l'exposition humaine à des champs magnétiques 50 Hz et des problèmes soulevés par la variabilité interindividuelle

Doctoral thesis (1995)

Evolution psychodynamique à moyen terme du processus vocationnel chez le grand adolescent. Le TAT

Doctoral thesis (1995)

The author has examined thirty 18years aged adolescents with help of the TAT. These subjects were again tested in a second time, 4 years later. What evolution between 18 and 22 years?

L'évolution psychodynamique à moyen terme du processus vocationnel chez le grand adolescent. Etudes de cas.

Doctoral thesis (1995)

The author presents a detailed story of six adolescents from 18 to 22 years from the point of view of their evolution in the field of vocational choice.

Evolution psychodynamique à moyen terme du processus vocationnel chez le grand adolescent. Le Rorschach

Doctoral thesis (1995)

The author has examined thirty 18 years old adolescents with help of the Rorschachtest. These subjects were examined a second time 4 years later. The question is :"What about changement"

Régulation transcriptionelle des gènes codant pour le lactogène placentaire humain

Doctoral thesis (1995)

Contribution à l'étude de l'induction florale chez Lolium temulentum L. Aspects physiologiques et moléculaires

Doctoral thesis (1995)

Traitement unifié de la Mécanique des Milieux Continus Solides en Grandes Transformations par la Méthode des Eléments Finis

Doctoral thesis (1995)

Contribution à l'étude des mécanismes d'action du tamoxifène sur les cellules épithéliales mammaires cancéreuses

Doctoral thesis (1995)

Contribution à l'étude électrophysiologique percutanée de l'unité motrice

Doctoral thesis (1995)

La modélisation de la circulation résiduelle sur le Plateau Continental Nord-Ouest Européen dans la perspective d'applications pluridisciplinaires

Doctoral thesis (1995)

Le théâtre religieux médiéval en langue d'oc

Doctoral thesis (1994)

Transformation in vitro de kératinocytes de col d'utérus par le virus du papillome humain type 33 (HPV-33)

Doctoral thesis (1994)

Traitement d'images numériques au moyen d'algorithmes utilisant la morphologie mathématique et la notion d'objet : application au codage

Doctoral thesis (1994)

Modélisation de la croissance et du développement de peuplements forestiers d'âges multiples : application à la hêtraie wallonne.

Doctoral thesis (1994)

The present study aims at designing a system predicting the growth and development of uneven-aged forest stands; it has been applied to beech stands in Southern Belgium. This study is made up of three ... [more ▼]

The present study aims at designing a system predicting the growth and development of uneven-aged forest stands; it has been applied to beech stands in Southern Belgium. This study is made up of three main parts. Following a bibliographical research about state-of-the-art of forest growth models, the first part deals with the development of a distance-independent tree growth model. This describes adult trees (girth > 40 cm) girth increments at breast height, according to variables connected with, on the one hand, tree measurement and social position, stand density and structure and, on the other hand, site and ecological features, mainly the length of vegetation period. Considering irregular stand structure and the predominance of natural regeneration, we have been interested in evaluating the feasibility of a model describing the growth and the evolution of such a regeneration in beech stands. The results achieved in this second part allow us to use a distance-independent model which is in agreement with the model describing adult trees growth. The last part of this study deals with the development a simulation software integrating both "adult trees" and "regeneration" models, as well as a procedure wich prescribe and carry out thinnings in stands whose growth is simulated. An user-friendly menu driven interface allows this software to be used by forest managers. Appropirate outcomes of the simulator give an idea of the potentialities of such a powerful tool in modern forest management, provided it is adapted to the main hardwood species of the Wallonian forest. [less ▲]

Komplementaktivierung und Aktivierung des Plasmakontaktsystems während Herz-Lungen-Maschinen Operationen beim Kind - Beziehung zum postoperativen Polyorganversagen

Doctoral thesis (1994)

Contribution à l'étude fondamentale et clinique de l'électrostimulation neuromusculaire

Doctoral thesis (1994)

Instabilités thermocapillaires et effets de confinement. Études linéaire et non linéaire en géométrie rectangulaire

Doctoral thesis (1994)

Dosage automatisé de médicaments dans les milieux biologiques par extraction liquide-solide associée à la chromatographie liquide haute performance

Doctoral thesis (1994)

"Contribution à la détermination de l’épidémiologie et de l'histoire naturelle des anévrysmes de l'aorte abdominale.”

Doctoral thesis (1994)

Développement et intégration d'outils informatiques pour l'aide à la décision environnementale. Application à la conception architetcturale.

Doctoral thesis (1993)

Cette thèse a montré comment les modèles informatique devaient être intégrés et devaient communiquer de l'information entre eux pour être appliqués efficacement aux problèmes d'environnement. L ... [more ▼]

Cette thèse a montré comment les modèles informatique devaient être intégrés et devaient communiquer de l'information entre eux pour être appliqués efficacement aux problèmes d'environnement. L'application priviliégiée est la conception de bâtiments dans une optique durable. [less ▲]

Contribution à l'étude de la phase précoce du choc septique :Analyse des effets hémodynamiques provoqués par l'administration continue de faibles doses d'endotoxine chez le chien.

Doctoral thesis (1993)

Modèle expérimental visant à démontrer que la perfusion soutenue d'une faible dose d'endotoxine reproduit le tableau clinique constaté chez l'homme.

Typage moléculaire de Clostridium perfringens : Application à l'étude de l'entérotoxémie bovine

Doctoral thesis (1993)

Assurance et criminalité: gérer et prévenir - Etude criminologique de l'assurance vol

Doctoral thesis (1993)

Etude du transfert d'eau et d'azote dans les sols d'un micro-bassin agricole.

Doctoral thesis (1993)

Résumé de la thèse de doctorat

Le variant placentaire de l'hormone de croissance humaine : purification et caractérisation partielle, étude de l'expression du gène

Doctoral thesis (1992)

Death as an Expression of Worldview in a Ballad Culture: The Evidence of Newfoundland

Doctoral thesis (1992)

This study investigates death as an expression of worldview in Newfoundland tradition, and with particular attention given to its classical ballads. From the correlation of their people's life style and ... [more ▼]

This study investigates death as an expression of worldview in Newfoundland tradition, and with particular attention given to its classical ballads. From the correlation of their people's life style and moral orientations (the pragmatic context), the views and values carried across genres (the symbolic context) and those expressed within the ballads (their poetic context), one claims to find articulated a coherent worldview upholding positive behaviour--in the face of death as in life. While this attitude is found expressed in traditional societies as well as in classical balladry, it pervades past and modern local tradition, and seems particularly appropriate to Newfoundland's maritime culture. The striking prominence of revenant types in the classical ballad repertoire and the exceptional courage of the heroine of the most popular "Sweet William's Ghost" (Ch 77) confirm local concern with bereavement and its successful resolution. This evidence for Newfoundland yields the proposition that, while the meanings carried in a cultural ballad corpus are essentially generic, they are actualized in dynamic relation with specific cultural contexts and worldviews. [less ▲]

Apports de l'analyse factorielle des correspondances multiples à l'étude de la santé financière des Petites ou Moyennes Entreprises

Doctoral thesis (1992)

This PhD dissertation first higlights the specificities of business failure prediction in SMEs, then elaborates a methodology based on the use of correspondence analysis to predict and ultimately to ... [more ▼]

This PhD dissertation first higlights the specificities of business failure prediction in SMEs, then elaborates a methodology based on the use of correspondence analysis to predict and ultimately to prevent bankruptcy by analyzing financial statements published by SMEs. It insists on the undercapitalisation of the company and on the disequilibrium between turnover and total assets as factors increasing the risk and the speed of business failure. [less ▲]

Etudes pharmacochimiques et pharmacologiques dans la série des azaarylazépines

Doctoral thesis (1992)

Environnement socio-géographique et état de santé subjectif de la population liégeoise. Recherche opérationnelle sur le système de santé

Doctoral thesis (1992)

Biogéographie et Écologie des Communautés de Carabidae en Wallonie

Doctoral thesis (1992)

1. Regional distribution of Carabid beetles in Belgium (1) The study of regional distribution of Carabid beetles is preceded by a detailed analysis of potential ecological factors such as, altitude ... [more ▼]

1. Regional distribution of Carabid beetles in Belgium (1) The study of regional distribution of Carabid beetles is preceded by a detailed analysis of potential ecological factors such as, altitude, climate, geology, pedology and lithology. The analysis sets up a mapping of geographically homogeneous areas. Ordination methods reveal a strong gradient in the set of potential ecological factors taken to account. This gradient is strongly correlated with altitude. Although maximum altitude in Belgium is 700 m, this factor explains most of the geographical structure, because all the other variables are correlated with it. Yet, edaphic conditions isolate the Belgian Lorraine from the other Belgian regions. In spite of the existence of the altitudinal gradient, several homogeneous regions separated from one another by stable frontiers are evident. These frontiers correspond to the maximal discontinuity zones of the local distribution of all potential ecological variables examined. The established frontiers are not artefacts produced on a continuous gradient but are real natural geographic boundaries. (2) Although the biogeographic structure is not as clear as the geographic structure, analysis of the distribution of Carabid beetles in Belgium allows us to define five biogeographic regions: the Coast, the sandy-loamy Flanders, the chalky regions (Condroz-Fagne-FamenneCalestienne and Belgian Lorraine) and the Ardennes plateau. A classification of the species in eight clusters, corresponding to different types of distribution, is established. Beside species groupes with geographical affinities explained by their ecological requirements, a cluster of rare species and one of species found on a large scale were evident. The role of the different potential factors of distribution has been evaluated. 15 to 20% of the total variance of the distribution data is directly explained by the factors of distribution. Among these, the principle factor is the topographic gradient. The climatic and edaphic factors seem to occur with the same intensity in the distribution. The role of these factors is strongly related to the spatial structure. More than half of the information they bring is explained by the geographic coordinates of U.T.M. squares. The ecological factors tend to reveal homogeneous biogeographic sets. HENGEVELD's hypothesis (1985) conceming the artificial character of the biogeographic regions is not confirmed in this case. Yet, it is clear that some biogeographic frontiers are better defined than others. The important overlapping of the different types of distributions makes it difficult to precisely define the biogeographic boundaries. (3) Study of the distribution dynamics reveals that about a third of the Carabid beetle species are in regression. This proportion is thought to be under-evaluated. Strong relationships are observed between species natural history traits, their type of distribution and the dynamics of their distribution. Species that regress are mostly xérophitic, and live in open habitats. Belgium is at the margin of their European distributional range. These species make up 70.6 and 50.0% of the total number of species and predominate respectively in chalky regions and Campine. Spreading species are generally dipolymorphic and eurytope. A detailed analysis of the methodology generally used for defining the types of distribution dynamics has some important limitations due to the type of methods used. We suggest the use of another estimator of sampling intensity rather than the number of species recorded by U.T.M. squares. 2. Species assemblage structures (1) The structure of Carabid beetle communities in open environments is studied by the sampling of 80, well distributed plots, in Wallonie. 65 of them have been followed for two years. The plots represent 10 types of habitat defined a priori. These habitats are: fringes of ponds, swamps, floating mires, raised mires, peat bogs, sandy heathlands, mineral heathlands, alluvial meadows, xeric chalky grasslands and serpentine soils. The analysis of botanic relevés shows a good concordance with the physionomic classification established a priori. A complex gradient, taking to account humidity and acidity, orders the different habitats. It contrasts first, dry alkaline plots to dry acid plots, then dry acid plots to wet acid plots. Data describing the stations edaphic characteristics show that the major chemical factor is the richness in mineral elements. The poorest plots are sandy heathlands and certain mineral heathlands or bogs. The richest are xeric chalky grasslands, swamps and raised mires. The second chemical factor is the acidity. Richness in mineral elements and acidity need to be compared by texture and classes of draining to better discriminate the different types of habitats. (2) Pit fall trap samples of the 80 plots studied, collected 43.096 specimens and 190 species, some of them very rare. Three species reported missing in Wallonie since 1950 were found. New distribution data were obtained for many species, especially those for which the habitat was poorly prospected by entomologistes. ~ diversity, ordinations and grouping indicate that the data are very well structured. About 60% of the data structure is conserved if the annual cycles of trapping are grouped in 8 classes corresponding to a classification of the plots based on Carabid beetles. This typology includes: xeric chalky grasslands, mineral heathlands, serpentine soils, very dry heathlands, wet heathlands, grassy heathlands, eutrophic wet habitats (swamps and alluvial meadows) and oligotrophic wet habitats (floating mires and raised mires). Analysis of distribution factors of Carabid beetles show, in general, that abiotic factors better explain the species distributions than biotic factors. Among biotic factors, parasitism isn't a major regulator of population densities. The number of Carabid beetles infected by laboulbeniales and acari is neglegable. The main effects of competition are not proved by the exclusion of congeneric species, taxonomically and ecologically related. However, strong indications show that certain pairs of taxonomically related species are characterised by disjoint distributions and therefore, have different ecological requirements. Ecological variables retained for explaining the Carabid beetle distribution expresse only a part of the information found by the grouping of annual pit fall trapping cycles. The grouping of annual pit fall trapping cycles explains about 60% of the original structure. The only major gradient is determined by the humidity of the substrata. Spatial autocorrelation is week. Data structures are better represented by partitions than ordinations which indicates that species assemblages is very compartmentalized. (3) Preliminary analysis of the fit of HANSKI's (1982) and BROWN's (1984) regional distribution models to Carabid beetle distribution indicates that Carabid beetle species assemblages are dominated by rare species which occupy only certain assemblages. There are so few species in most of the sites from each habitat types that HANSI's model and the associated dassification of core and satellite species are not supported. The high number of rare species in Carabid beetle assemblages has two origins. About half of them are effectively rare at other spatial levels. The others belong to well represented eurytopic species and must be considered as erratic elements. 3. Conclusions Species assemblages differentiate from one another at a regional scale or for different types of habitats. At a local scale, Carabid beetle assemblages are characterised by a big number of rare species and few species common to all the sampling units, however. High heterogeneity is observed in a habitat type or even in a station. These observations seem to indicate that Carabid species assemblages are open systems, where local equilibrium is rarely reached. Subsequent researches, comparing natural history traits of these assemblages to those of forest habitats, should conflrm this observation. Multivariate analysis are powerful tools to extract the most objectivety as possible from the structure of a data set. Nevertheless, the choice of the methods remains fundamental. Only a cautious process, not limited to graphs and results obtained by software, but further research of the strong and recurrent forms, is the only way to guarantee the validity of the revealed structure. This work has allowed to establish that Carabid beetles assemblages are better explained by the stochastic community model rather than the determinist model. Physical components of the environment are more important that interspecific interactions. Distributions areas and species groups are revealed for the first time in Belgium, with multivariate analysis. Some enhancements are brought to these multivariate methods. We emphasize also the importance of the relationships between the different study scales of biological phenomenon. [less ▲]

Transports de chaleur et de vapeur d'eau dans les couverts végétaux sous serre : approche théorique et expérimentale

Doctoral thesis (1991)

Caractérisation et purification préliminaires de l'Astrostaine, une protéine neuronale inhibant la prolifération des astrocytes de type 1

Doctoral thesis (1991)

In this work, we report the preliminary characterization and purification of astrostatine, a protein secreted by neuronal cells in culture and which inhibits type 1 astrocytes proliferation. This protein ... [more ▼]

In this work, we report the preliminary characterization and purification of astrostatine, a protein secreted by neuronal cells in culture and which inhibits type 1 astrocytes proliferation. This protein of a low molecular weight (14 kDa) is not active on glioma cell lines but is released by normal or tumoral neurons in culture. [less ▲]

Potentialités photosensibilisatrices de la Merocyanine 540.

Doctoral thesis (1991)

Etude de la semi-rigidité des noeuds poutre-colonne et son influence sur la résistance et la stabilité des ossatures en acier

Doctoral thesis (1991)

Etude du système respiratoire du cheval en tant que facteur limitant la performance chez le cheval

Doctoral thesis (1991)

Du mythe à la raison: le temps de la formation professionnelle

Doctoral thesis (1991)

La "rallonge" chez Tacite : fondements linguistiques d'un procédé de style

Doctoral thesis (1991)

Sur les zéros des opérateurs maximaux monotones et applications

Doctoral thesis (1990)

Une approche de l'intelligence artificielle appliquée à l'évaluation de la stabilité transitoire des réseaux électriques

Doctoral thesis (1990)

Vers une auto-régulation des conduites d'animation en milieu LOGO

Doctoral thesis (1990)

La morphologie verbale en néo-égyptien (de la 18e à la 25e dynastie)

Doctoral thesis (1989)

Etat actuel de la vaccination anti-palustre

Doctoral thesis (1989)

Les différents pôles de recherche sur la vaccination antipalustre sont abordés afin de dresser l'état actuel des connaissances sur le sujet. Dans une première partie, restituant le paludisme sur le plan ... [more ▼]

Les différents pôles de recherche sur la vaccination antipalustre sont abordés afin de dresser l'état actuel des connaissances sur le sujet. Dans une première partie, restituant le paludisme sur le plan épidémiologique, on insiste sur les aléas de la lutte contre le parasite et ses vecteurs. Dans une seconde partie, après un rappel sur l'aspect immunologique du paludisme, la synthèse des progrès réalisés dans les trois axes de la vaccination, antisporozoïte, anti-stades sanguins asexués et anti-stades sexués, permet de comprendre pourquoi il n'existe pas encore de vaccin utilisable chez l'homme, et pourquoi l'on s'oriente désormais vers un vaccin multivalent. [less ▲]

Synthèse et évaluation biologique de dérivés de l'amino-5 thiazole et de l'amino-4 triazole-1,2,4, inhibiteurs potentiels de protéases à sérine bactériennes

Doctoral thesis (1989)

Enjeux et stratégies du discours dans l'oeuvre d'Alphonse Allais

Doctoral thesis (1989)

Organisation ultrastructurale du nucléole au cours du cycle cellulaire. Etude cytochimique, immunocytochimique et par hybridation in situ

Doctoral thesis (1989)

Modélisation simplifiée du comportement thermique d'un bâtiment et vérification expériementale

Doctoral thesis (1988)

The buildings reference models (among others those based on the transfer functions of the walls) aimed to simulate the thermal behaviour are too complex and computer time consuming compared to the ... [more ▼]

The buildings reference models (among others those based on the transfer functions of the walls) aimed to simulate the thermal behaviour are too complex and computer time consuming compared to the accuracy of the needed data they require and the assumptions generally made. By an electrical analogy, a model whose order is lower than 4 is first proposed to model the walls. Then, a proposal for a two second order model is made for a one zone building and how to connect the different rooms in a multi-zone building. The way to take into account the solar gains is also proposed. The model thus proposed has been validated experimentally on a small scale of a one zone building in laboratory and in "situ". In an occupied dwelling in a residential building, the occupation gains seemed to be one of the main uncertainty of the modelling. In that thesis, a simplified model for the inside heat transfer coefficients is also proposed and validated experimentally in a climatic chamber in order to predict the gradient temperature which occurs in a room. [less ▲]

Pétrologie et géochimie des skarns ferrifères et tungstifères de Traversella (Ivrea, Italie)

Doctoral thesis (1988)

Etude moléculaire des mécanismes de régulation de l'expression du gène PUT4 codant pour la perméase spécifique de la proline de Saccharomyces cerevisiae. Etude de la structure et du rôle du gène NPR1 impliqué dans la régulation d'activité de la perméase PUT4.

Doctoral thesis (1988)

Triphosphate de thiamine et bioélectrogenèse

Doctoral thesis (1988)

Etude économique des abattoirs en Belgique

Doctoral thesis (1988)