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See detailThe effect of Brand Anthropomorphism on Self-Disclosure
Gretry, Anaïs ULg; Horváth, Csilla; Belei, Nina et al

Conference (2014, October 23)

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See detailThe Initial Upper Paleolithic in Northeast Asia: toward the definition of a techno-complex
Zwyns, N.; Teyssandier, N.; Izuho, M. et al

Conference (2014, October 23)

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See detailUniversité : Les interactions possibles avec l’enseignement non-universitaire
Winand, Jean ULg

Conference (2014, October 23)

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See detailProblèmes du plurilinguisme dans l'antiquité gréco-romaine
Rochette, Bruno ULg

Scientific conference (2014, October 23)

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See detailMontage de projets de Recherche et d’Innovation : A la recherche de financements
Hiligsmann, Serge ULg

Scientific conference (2014, October 23)

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See detailEvolution des eucaryotes : l'éclairage de la phylogénie moléculaire
Baurain, Denis ULg

Conference (2014, October 23)

Ce cours-conférence propose d'examiner l'origine et l'évolution des eucaryotes au travers de la biologie, la géologie et la paléontologie. Les eucaryotes forment un des trois domaines de la vie, et ... [more ▼]

Ce cours-conférence propose d'examiner l'origine et l'évolution des eucaryotes au travers de la biologie, la géologie et la paléontologie. Les eucaryotes forment un des trois domaines de la vie, et comprennent les animaux (dont les êtres humains), les plantes et les champignons, mais surtout une énorme majorité de protistes (eucaryotes unicellulaires) dont la diversité reste encore en partie à explorer. De grandes questions restent à élucider quant à l'origine du domaine Eucarya, sa position au sein de l'arbre de la vie, et les modalités et conditions de diversification et d'évolution depuis au moins 1,8 milliards d'années. La première leçon abordera l'origine de la cellule eucaryote, en discutant les différentes hypothèses existantes et la nature de LECA (Last Eucaryotic Common Ancestor). Comment tester ces hypothèses avec de nouvelles approches ? Comment révéler la diversité actuelle des eucaryotes encore en partie inexplorée et quelles réponses peut-elle apporter ? La seconde leçon présentera d'abord l'éclairage de la phylogénie moléculaire : comment utiliser les informations conservées dans le matériel génétique, pour mieux comprendre l'évolution des eucaryotes ? Quelles sont les possibilités et les limitations de la phylogénomique et des horloges moléculaires ? On présentera ensuite les informations enregistrées dans le registre fossile du Précambrien. Comment reconnaitre les eucaryotes fossiles, les étudier, et reconstruire leur évolution et diversification dans les conditions paléoenvironnementales depuis au moins 1,8 milliards d'années ? Ces deux leçons donneront donc un aperçu de l'état des connaissances, des nouvelles méthodes utilisées, et des grandes énigmes à résoudre à propos de notre domaine Eucarya. [less ▲]

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See detailDebatte über Kollaboration. Tristes Spektakel
Brüll, Christoph ULg

Article for general public (2014)

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See detailManaging understory light to maintain the coexistence of forest tree species with different shade tolerances
Ligot, Gauthier ULg

Doctoral thesis (2014)

Similar to the management of the other environmental resources, forest management has been questioned and more sustainable practices of forest management are being sought. New close-to-nature practices ... [more ▼]

Similar to the management of the other environmental resources, forest management has been questioned and more sustainable practices of forest management are being sought. New close-to-nature practices aim to favor natural processes over human interventions. Particularly, continuous-cover forestry has the goal of relying on natural regeneration, and maintaining irregular stand structure and tree species mixture. However, maintaining mixture of species with different shade tolerances appears arduous with such a silvicultural system. Successfully managing irregular and mixed forests, relying on natural processes, requires a strong knowledge of the ecology of natural regeneration. In particular, strong knowledge is required to predict the result of the interspecific competition in the understory depending upon light availability. The amount of radiation transmitted to the understory is indeed a critical factor determining regeneration dynamics. It determines, at least in part, regeneration composition because of interspecific differences of growth and survival under shade. Moreover, our quantitative understanding of understory light in uneven-aged and mixed stands remains incomplete. A better quantitative understanding of understory light is needed to provide quantitative guidelines for the management of understory light in uneven-aged and mixed stands and, hence, for the management of natural regeneration. The purpose of this thesis is to determine how close-to-nature forest management can maintain mixtures of species with contrasting shade tolerances. I consider ecological conditions with good water and nutrient supplies. In these conditions, partially closed canopy limits the amount of light that reaches the understory, and light is the major factor driving regeneration composition. Consequently, I study the dynamics of natural regeneration with regards to light availability as well as the interception of light by the canopy of heterogeneous stands. Studying the regeneration ecology of two species with contrasting shade tolerances (Fagus sylvatica L. and Quercus petraea (Matt.) Liebl.), I find that the shade-tolerant species outgrow the less shade-tolerant species in all light conditions. Even though the control of understory light with continuous-cover silviculture is required to sustain the growth of less shade-tolerant regenerations, it might not be sufficient to maintain the coexistence of species with contrasting shade tolerances. In order to examine the effects of canopy structure and composition on understory light availability, I use a model of light interception by heterogeneous canopies after synthesizing and discussing the approaches reported in the literature. The model predicts satisfactorily measures of transmitted light even though it is a relatively simple radiative transfer model. I next explore how various silvicultural treatments can be manipulated to provide favorable understory light conditions for natural regeneration. These silvicultural strategies correspond to selective thinnings of five different types, e.g., harvesting preferentially small trees, large trees, or trees of shade-tolerant species or creating circular gaps. The results underline that creating favorable understory light conditions for natural regeneration can be achieved with various regeneration treatments. However, the adequate reduction of stand density depends upon the chosen silvicultural strategies. In particular, creating gaps of about 500 m2 provides adequate light for small regeneration clumps. Harvesting preferentially small and trees of shade-tolerant species are also appropriate but required higher harvest intensity. Harvesting preferentially large trees slightly increases understory light and promotes more shade-tolerant species than less shade-tolerant species. In order to maintain the coexistence of species with contrasting shade tolerances, forest manager must control understory light and manually suppress the regeneration of the shade-tolerant species. The outcome of this study provides foresters with the necessary tools to evaluate how silvicultural treatments can be manipulated to create or maintain favorable light conditions for the regeneration of species of different shade tolerances. Guidelines are additionally proposed for forest managers wanting to maintain the coexistence of species with contrasting shade tolerances. [less ▲]

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See detailRegularity of functions: Genericity and multifractal analysis
Esser, Céline ULg

Doctoral thesis (2014)

As surprising as it may seem, there exist functions of C∞(R) which are nowhere analytic. When such an unexpected object is found, a natural question is to ask whether many similar ones may exist. A ... [more ▼]

As surprising as it may seem, there exist functions of C∞(R) which are nowhere analytic. When such an unexpected object is found, a natural question is to ask whether many similar ones may exist. A classical technique is to use the Baire category theorem and the notion of residuality. This notion is purely topological and does not give any information about the measure of the set of objects satisfying such a property. In this purpose, the notion of prevalence has been introduced. Moreover, one could also wonder whether large algebraic structures of such objects can be constructed. This question is formalized by the notion of lineability. The first objective of the thesis is to go further into the study of nowhere analytic functions. It is known that the set of nowhere analytic functions is residual and lineable in C∞([0, 1]). We prove that the set of nowhere analytic functions is also prevalent in C∞([0, 1]). Those results of genericity are then generalized using Gevrey classes, which can be seen as intermediate between the space of analytic functions and the space of infinitely differentiable functions. We also study how far such results of genericity could be extended to spaces of ultradifferentiable functions, defined using weight sequences or using weight functions. The second main objective is to study the pointwise regularity of functions via their multifractal spectrum. Computing the multifractal spectrum of a function using directly its definition is an unattainable goal in most of the practical cases, but there exist heuristic methods, called multifractal formalisms, which allow to estimate this spectrum and which give satisfactory results in many situations. The Frisch-Parisi conjecture, classically used and based on Besov spaces, presents two disadvantages: it can only hold for spectra that are concave and it can only yield the increasing part of spectra. Concerning the first problem, the use of Snu spaces allows to deal with non-concave increasing spectra. Concerning the second problem, a generalization of the Frisch-Parisi conjecture obtained by replacing the role played by wavelet coefficients by wavelet leaders allows to recover the decreasing part of concave spectra. Our purpose in this thesis is to combine both approaches and define a new formalism derived from large deviations based on statistics of wavelet leaders. As expected, we show that this method yields non-concave spectra and is not limited to their increasing part. From the theoretical point of view, we prove that this formalism is more efficient than the previous wavelet-based multifractal formalisms. We present the underlying function space and endow it with a topology. [less ▲]

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See detailExtension of the Gurson model for the LAGAMINE code
Guzmán Inostroza, Carlos Felipe ULg

Report (2014)

Damage and fracture modeling deals with material softening and strain localization, which usu- ally leads to unwanted numerical features like loss of ellipticity of equilibrium equations, bifurcation into ... [more ▼]

Damage and fracture modeling deals with material softening and strain localization, which usu- ally leads to unwanted numerical features like loss of ellipticity of equilibrium equations, bifurcation into a shear band, etc. A first step before dealing with these problems is to have already a stable, accurate integration scheme for the damage model. Here, the numerical integration of an extended version of the Gurson model (comprising plastic anisotropy and mixed isotropic-kinematic hardening) proposed by Ben Bettaieb et al. (2011b), is revisited and further extended to include nucleation, coalescence and shear. The main feature of this scheme is that all the variables are integrated in an implicit way based on the projection algorithm, while the consistent tangent matrix is obtained analytically. A detailed derivation of the equations used to extend the model is presented and a link with the developed subroutine is made. The efficiency of the implementation is assessed by comparing the numerical results from homogeneous cases from those taken from the literature. The results are in good agreement, hence implying that the model can be used in more complex simulations involving heterogeneous strain paths. [less ▲]

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See detailL'ambivalence de la bibliothèque: l'érudition au XVIIe siècle
Decoster, Sara ULg

Conference (2014, October 22)

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See detailUn savoir enfermé est un savoir stérile : Subir ou agir ?
Rentier, Bernard ULg; Thirion, Paul ULg

Scientific conference (2014, October 22)

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See detailA model for concrete in the fire situation and its application in structural fire engineering
Gernay, Thomas ULg

Scientific conference (2014, October 21)

Detailed reference viewed: 17 (4 ULg)
See detailHistoire des Musiques Africaines-Americaines - Partim Le BLUES avant 1945
Sacré, Robert ULg

Conference given outside the academic context (2014)

- Racines africaines du blues ; - Les chanteuses de blues classique ( Bessie Smith, Ma Rainey,…); - Le blues rural ( Mississippi, Texas, East Coast) , - Le blues urbain ( Memphis, Saint Louis, Chicago ... [more ▼]

- Racines africaines du blues ; - Les chanteuses de blues classique ( Bessie Smith, Ma Rainey,…); - Le blues rural ( Mississippi, Texas, East Coast) , - Le blues urbain ( Memphis, Saint Louis, Chicago) pre-1945 [less ▲]

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See detailHow to survey your hippos night and day? Follow them in bed with drones!
Linchant, Julie ULg; Lejeune, Philippe ULg; Vermeulen, Cédric ULg

Scientific conference (2014, October 20)

Detailed reference viewed: 24 (3 ULg)
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Peer Reviewed
See detailCombined holography and thermography in a single sensor through image-plane holography at thermal infrared wavelengths
Georges, Marc ULg; Vandenrijt, Jean-François ULg; Thizy, Cédric ULg et al

in Optics Express (2014), 22(21), 25517-25529

Holographic interferometry in the thermal wavelengths range, combining a CO2 laser and digital hologram recording with a microbolometer array based camera, allows simultaneously capturing temperature and ... [more ▼]

Holographic interferometry in the thermal wavelengths range, combining a CO2 laser and digital hologram recording with a microbolometer array based camera, allows simultaneously capturing temperature and surface shape information about objects. This is due to the fact that the holograms are affected by the thermal background emitted by objects at room temperature. We explain the setup and the processing of data which allows decoupling the two types of information. This natural data fusion can be advantageously used in a variety of nondestructive testing applications. [less ▲]

Detailed reference viewed: 14 (5 ULg)