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See detailÉvaluation du niveau de stress du cheval en compétition et en milieu hospitalier : Mesures comportementales, physiologiques et appréciation du tempérament
Peeters, Marie ULg

Doctoral thesis (2011)

Both in humans and in animals, stress is sometimes considered as useful for the accomplishment of certain tasks. But it might also have a negative influence on health, welfare or safety. We often impose ... [more ▼]

Both in humans and in animals, stress is sometimes considered as useful for the accomplishment of certain tasks. But it might also have a negative influence on health, welfare or safety. We often impose on our domestic horses a lifestyle very different from their natural one. As soon as we interact with this animal, either during manipulations or in competition, we face him to various stressors. This stress can affect their health, their well-being as well as their sportive performances. Horses’ stress might also lead to a lack of safety for people handling them (horsemen, riders, breeders, veterinarian,...). Stress can be assessed by various indirect ways. Among all responses possibly shown by horses submitted to a stressor, we mainly focused on behavioural responses and on a physiological response: changes in cortisol secretion. Our first goal was to validate the use of saliva for free cortisol level determination. Secondly, we used this technique to assess stress level of both horses and riders during equestrian competitions. We compared riders’ and horses’ stress levels and we examined the potential relationship between the stress levels and the competition performances. The results showed that cortisol levels significantly increased during competition, both in horses and riders. The best performances were achieved by riders with the smallest increase in cortisol during competition. And, more surprisingly, the best performances were achieved by horses with highest cortisol increase. In this study, stress of both partners seems to have an opposite influence on their performances during competition: positive effects for horses (‘eustress’) but negative effects for riders (‘distress’). It would be interesting to test these measurements under other competition conditions. We also have tested the relationship between the horse’s temperament (scored by the owner), the stress levels in competition and the obtained performances. It came out that a higher increase in cortisol is more related to some ‘excitement’ rather than anxiety, and was mainly found in curious, motivated and active horses. This stress follow-up in competition should improve the welfare of the horse and his rider, and should probably also enhance performances achieved by the pair. In clinical settings, we identified the stress-related behaviours, that use to lead to a low ‘easiness of manipulation’. We also tested the relationship between temperament assessed by the owners, by the clinic staff and the stress-related behaviours. More particularly, we observed a predictive effect of a simple test (weigh scale test) on the appearance of these stress-related behaviours. This test would allow clinicians to anticipate potential difficulties during examinations and to prevent deriving injuries. Improving the stress measurement techniques and horses’ temperament assessment is essential for domestic horse welfare studies, as they occur in hospital, during competition, or in other stressful situations. Using physiological stress measurements, as salivary cortisol, is very useful and more reliable if they are used in conjunction with ethological methods.  [less ▲]

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See detailOptimiser l'usage des fourrages auto-produits et viser l'autonomie protéique
Beckers, Yves ULg

Conference given outside the academic context (2011)

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See detailRisk factors for Zaire ebolavirus--specific IgG in rural Gabonese populations.
Nkoghe Mba, Dieudonne ULg; Padilla, Cindy; Becquart, Pierre et al

in Journal of Infectious Diseases (2011), 204 Suppl 3

BACKGROUND: In Gabon, several Ebolavirus outbreaks have occurred exclusively in the northeastern region. We conducted a large serosurvey to identify areas and populations at risk and potential demographic ... [more ▼]

BACKGROUND: In Gabon, several Ebolavirus outbreaks have occurred exclusively in the northeastern region. We conducted a large serosurvey to identify areas and populations at risk and potential demographic, clinical, and behavioral risk factors. METHODS: Blood samples and clinical and sociodemographic data were collected from 4349 adults and 362 children in a random sample of 220 villages in the 9 provinces of Gabon. An enzyme-linked immunosorbent assay was used to detect Zaire ebolavirus (ZEBOV)-specific IgG, and thin blood smears were used to detect parasites. Logistic regression was implemented using Stata software (Stata), and a probability level of <.05 was considered to be statistically significant. RESULTS: The prevalence of ZEBOV-specific IgG was 15.3% overall, increasing to 32.4% (P< .001) in forest areas. No sociodemographic risk factors were found, but the antibody prevalence increased linearly up to 20 years of age. Chronic arthralgia and amicrofilaremia were the only factors associated with ZEBOV seropositivity. CONCLUSIONS: These findings confirm the endemicity of ZEBOV in Gabon and its link to the ecosystem. Human antibody positivity would appear to be to the result of exposure to contaminated fruits. [less ▲]

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See detailLe test d'activation des Basophiles et les allergies médicamenteuses
Evrard, Séverine; GADISSEUR, Romy ULg

Conference (2011, December 19)

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See detailImpact of contamination on the TCLUST procedure
Ruwet, Christel ULg; García-Escudero, Luis Angel; Gordaliza, Alfonso et al

Conference (2011, December 18)

The TCLUST procedure is a robust clustering procedure that performs clus- tering with the aim of tting clusters with di erent scatters and weights. As the corresponding objective function can be unbounded ... [more ▼]

The TCLUST procedure is a robust clustering procedure that performs clus- tering with the aim of tting clusters with di erent scatters and weights. As the corresponding objective function can be unbounded, a restriction is added on the eigenvalues-ratio of the scatter matrices. The robustness of the method is guaranteed by allowing the trimming of a given proportion of observations. The resistance to contamination of that procedure will be studied. Results con- cerning breakdown points and some new criteria in robust cluster analysis, such as the dissolution point and the isolation robustness, will be presented. [less ▲]

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See detailIntroduction aux relations internationales: 60 heures
Santander, Sébastian ULg

Learning material (2011)

Il s'agit d'une structure détaillée du cours d'introduction aux relations internationales. Cette structure concerne le cours de 60 heures.

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See detailNew World : Evaluation écologique de l'axe cognition-fonctionnement
Domken, Marc-André; Laloyaux, Julien ULg

Conference (2011, December 16)

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See detailFirst-principles study of multiferroic materials : BiFeO3 and Bi2FeCrO6
Goffinet, Marco ULg

Doctoral thesis (2011)

The present work is devoted to an ab-initio characterization, using planewave and localized basis sets, of multiferroic and magnetoelectric materials. After a general description of the underlying ... [more ▼]

The present work is devoted to an ab-initio characterization, using planewave and localized basis sets, of multiferroic and magnetoelectric materials. After a general description of the underlying concepts and computational techniques, we focus on BiFeO3, which is probably the most intensively studied multiferroic. We start our investigation by comparing the ability of different exchange-correlation functionals (LSDA(+U), GGA and hybrid) to accurately describe the most fundamental properties of BiFeO3 (crystallographic structure, electronic band structure, magnetism, phonons at Gamma, Born effective charges). Next we present infrared reflectivity and Raman spectra obtained from first-principles and compare them to experimental data. We then extend the study of the dynamical properties of BiFeO3 to the whole Brillouin zone by analyzing the phonon band structure, density of states and interatomic force constants. We also use combined Einstein and Debye models to fit the specific heat as obtained from first-principles and compare it to experimental data. The final part of this thesis is devoted to the investigation of pressure driven spin phase transitions in Bi2FeCrO6 . [less ▲]

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See detailL'absence et l'interruption dans le parcours interprétatif d'une installation de Dany Danino
Lindenberg Lemos, Carolina ULg

Conference (2011, December 16)

According to the current semiotic hypothesis in the studies of enunciation, we assume negation is to be found in the relations between signs as well as in their semantic differences, and not in positive ... [more ▼]

According to the current semiotic hypothesis in the studies of enunciation, we assume negation is to be found in the relations between signs as well as in their semantic differences, and not in positive realizations of such signs. In the study proposed here, negativity arises from the contrasts of figures, not only because of the opposition between signs themselves, but also because the values apprehended testify a questioning of some artistic and scientific fields. Our paper discusses thus an artistic installation by the Belgian-Israeli artist Dany Danino. The contrast between figures reveal the different fields mentioned in his work – architecture, mathematics, anatomy and also the arts. At the same time that they are cited and assumed, these fields are also the target of some sort of negation. This negative form is, however, not expressed in the signs. It is established in the contrastive syntagmatic organization that creates dynamic relations between the parts and the installation as a whole, as well as its socio-cultural context and its exposition setting. Français : Selon l’hypothèse en vigueur en sémiotique énonciative, nous supposons que la négation se présente, toujours de façon partielle et plus ou moins cachée, dans les relations entre signes ainsi que dans leurs différentiels sémantiques plutôt que dans des formes positivement présentées. Dans l'étude qui est ici proposée, la négativité surgit du contraste des figures, non seulement en raison de l'opposition entre les signes eux-mêmes, mais aussi parce que les valeurs qui s’en dégagent peuvent témoigner d'un questionnement à l’égard des champs artistiques et scientifiques convoqués dans l’œuvre. Notre analyse porte ainsi sur une installation de l'artiste belgo-israélien Dany Danino. Le contraste entre les figures montre que les différents champs en présence — l'architecture, la mathématique, l'anatomie et les arts plastiques eux-mêmes —, dans le même temps qu'ils sont cités et assumés, sont visés par une forme de négation. Or cette forme négative n’est pas connotée dans les signes. Mais elle s’instaure dans un agencement syntagmatique contrastif qui rend dynamique les relations des parties avec le tout de l’installation, en ce compris son contexte socio-culturel et sa situation d’exposition. [less ▲]

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See detailSéminaire de Chimie médicale - Les Immunoassays
CAVALIER, Etienne ULg

Learning material (2011)

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See detailSur ce que l’antipsychologisme husserlien doit à Lotze
Gyemant, Maria ULg

in Boccaccini, Federico (Ed.) Lotze (2011, December 16)

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See detailLa Justice n'est qu'une justice
Defossez, Alexandre ULg

Article for general public (2011)

Detailed reference viewed: 17 (4 ULg)
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Peer Reviewed
See detailSudden crash or long torture: the timing of market reactions to operational loss events
Muller, Aline ULg; Biell, Elizabeth

Conference (2011, December 16)

Detailed reference viewed: 9 (0 ULg)
See detailLa "Geltung" de Lotze et l'a priori matériel
Dewalque, Arnaud ULg

Conference (2011, December 16)

Je me propose de réévaluer un certain aspect de l’héritage de Lotze, à savoir sa théorie de la validité (Geltung). En m’inspirant notamment d’une remarque de Georg Misch, qui fut l’éditeur de la troisième ... [more ▼]

Je me propose de réévaluer un certain aspect de l’héritage de Lotze, à savoir sa théorie de la validité (Geltung). En m’inspirant notamment d’une remarque de Georg Misch, qui fut l’éditeur de la troisième édition du système de Lotze en 1912, et de certaines déclarations de Husserl, je défendrai la thèse suivante : la théorie lotzéenne de la validité appartient à une tradition qui se caractérise par la découverte de propositions aprioriques d’un certain genre, à savoir des relations of ideas (au sens de Hume), des lois aprioriques matérielles (au sens de Husserl) ou des axiomes objectifs, régionaux ou matériels (au sens de Stumpf). Ce que je voudrais suggérer, en un mot, c’est qu’il y a une connexion étroite entre le concept lotzéen de validité et la découverte de l’a priori matériel. [less ▲]

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See detailProcessus d'externalisation graphique dans les activités cognitives complexes : le cas de l’esquisse numérique en conception architecturale individuelle et collective
Safin, Stéphane ULg

Doctoral thesis (2011)

This thesis investigates the modalities of creating external representations in complex cognitive activities, especially graphical representations: the explanatory diagrams, annotations of documents or ... [more ▼]

This thesis investigates the modalities of creating external representations in complex cognitive activities, especially graphical representations: the explanatory diagrams, annotations of documents or drawings make it possible to formulate ideas, to synthesize information, to communicate and to reason. This work seeks to understand in depth the processes involved in graphic expression, and the impact of representation supports on this activity. For this purpose, it addresses the original concept of digital sketch in the field of architectural design. This concept aims to allow the architect to draw freehand sketches, in an entirely digital environment, but in a «natural» way, as with its traditional tools. The idea is to take advantage of the ease of use of the pen, while exploiting the capabilities of simulation or representation of the digital medium. The freehand sketch is indeed known as an essential tool for the design: thanks to its fluidity, its immediacy and the freedom it allows, it supports efficiently the creative phases of ideation. It is also a powerful tool for document annotation in collaborative design and project review. This work analyzes the interest and the contribution of digital sketching in architectural design, but also stresses the constraints it vehicles as an instrument of individual and collective thought. It also seeks to identify the impact of electronic pen as a mode of interaction on the cognitive and graphical activities in design tasks. This thesis is based on three original empirical studies on the use of digital sketching environments. It describes the logic of graphical externalization, compares the characteristics of digital and traditional sketches, identifies the cognitive functions of representations transformations and makes explicit the role of the graphical modality in collaborative remote design. [less ▲]

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