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Peer Reviewed
See detailDisplacement amplification mechanism in a capacitive accelerometer
Zeimpekis, Ioannis; Kraft, Michaël ULg

in MME 2008: Technical digest (2008, September)

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See detailDisplacement and equilibrium models in the finite element method
Fraeijs de veubeke, Baudouin ULg

in Zienkiewicz, O. C.; Holister, G. S. (Eds.) Stress Analysis (1965)

A capital contribution to the finite element method, including for the first time equilibrium models, dual analysis, the quadratic displacement element, a discussion of mixed formilation, and the ... [more ▼]

A capital contribution to the finite element method, including for the first time equilibrium models, dual analysis, the quadratic displacement element, a discussion of mixed formilation, and the limitation principle. [less ▲]

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See detailDisplacement as a consequence of climate change mitigation policies
Vigil Diaz Telenti, Sara ULg

in Forced Migration Review (2015), 49

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See detailDisplacement as a consequence of climate change mitigation policies
Vigil Diaz Telenti, Sara ULg

Conference given outside the academic context (2015)

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See detailDisplacement echoes: Classical decay and quantum freeze
Petitjean, Cyril ULg; Bevilaqua, Diego V.; Heller, Eric J. et al

in PHYSICAL REVIEW LETTERS (2007), 98(16), 164101-4

Motivated by neutron scattering experiments, we investigate the decay of the fidelity with which a wave packet is reconstructed by a perfect time-reversal operation performed after a phase-space ... [more ▼]

Motivated by neutron scattering experiments, we investigate the decay of the fidelity with which a wave packet is reconstructed by a perfect time-reversal operation performed after a phase-space displacement. In the semiclassical limit, we show that the decay rate is generically given by the Lyapunov exponent of the classical dynamics. For small displacements, we additionally show that, following a short-time Lyapunov decay, the decay freezes well above the ergodic value because of quantum effects. Our analytical results are corroborated by numerical simulations. [less ▲]

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See detailDisplacement Extrapolation Method : An alternative to J-integral for stress intensity factors computation using X-FEM
Minnebo, Hans; Majérus, Julien; Noels, Ludovic ULg

Conference (2010)

Stress intensity factors (SIFs) computation techniques based on J-integral methods [1] are widely used in finite element codes. However, the Displacement Extrapolation Method (DEM) [2] is an alternative ... [more ▼]

Stress intensity factors (SIFs) computation techniques based on J-integral methods [1] are widely used in finite element codes. However, the Displacement Extrapolation Method (DEM) [2] is an alternative way to compute them. The idea is to process an extrapolation based on the relative displacement of the crack face nodes. This method is generally less accurate than integral methods, but it requires much less computational resources. The method is well documented and is implemented in some finite element software. The X-FEM introduced in [3] is suited for crack problems. However, the literature on DEM in the X-FEM case seems to be non-existent in the present time. This paper tries to fill this lack in the literature by describing a new method using X-FEM. The approach followed here is only developed for Linear Elastic Fracture Mechanics. Note that the finite element software Code_Aster [4] already computes SIFs with DEM in X-FEM, but in a slightly different way. [less ▲]

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See detailDisplacement measurements of a parabolic reflector by holographic interferometry in the long-wavelength infrared
Vandenrijt, Jean-François ULg; Georges, Marc ULg; Thizy, Cédric ULg et al

in International Astronautical Congress 2010 (2010, September)

Deformation metrology of complex shape space structure and reflectors is a recurrent problem addressed by ESA. Consequently, suitable measurement techniques have to be developed and validated to support ... [more ▼]

Deformation metrology of complex shape space structure and reflectors is a recurrent problem addressed by ESA. Consequently, suitable measurement techniques have to be developed and validated to support relevant on-ground qualification and verification testing. Holographic techniques in the visible wavelengths are common for measuring the surface displacement of object. However the short wavelength induces high stability criteria which are so severe that they often prevent the measurement of large space structures under good conditions. We propose to use a wavelength longer than the usual visible ones to render such holographic displacement measurement techniques less sensitive to external perturbations. For this we consider CO2 laser emitting at 10.6 μm which correspond to the long-wavelength infrared (LWIR) spectrum. The most important element for performing holography is to use an adequate recording medium. However no convincing holographic recording media exists in LWIR and we decided to investigate the possibility of electronic hologram recording, such as electronic speckle pattern interferometry (ESPI). This possibility is feasible nowadays thanks to various thermal imaging technologies such has uncooled microbolometers sensors commonly found in thermographic cameras. In this study, we analyse how it is possible to measure surface displacements of specular objects, which do not produce speckle, using speckle interferometry by the mean of a scattering diffuser. We then apply the ESPI technique at LWIR for measuring displacements of a large parabolic reflector. [less ▲]

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See detailDISPLACEMENT OF 18F-FALLYPRIDE BINDING WITH HALOPERIDOL IN A WITHIN-SUBJECT DESIGN USING A BETA MICROPROBE
Warnock, Geoffrey ULg; Goblet, David ULg; Lemaire, Christian ULg et al

in Journal of Cerebral Blood Flow & Metabolism (2009, October), 29(S1), 352-353

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See detailDisplacement of an Electrically Charged Drop on a Vibrating Bath
Brandenbourger, Martin ULg; Vandewalle, Nicolas ULg; Dorbolo, Stéphane ULg

in Physical Review Letters (2016), 116

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See detailDisplacements of Structures
Samyn, Philippe; Latteur, Pierre ULg

(1998, September)

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See detailDisplaying in the dark: light-dependent alternative mating tactics in the Alpine newt
Denoël, Mathieu ULg; Doellen, Joffrey

in Behavioral Ecology and Sociobiology (2010), 64(7), 1171-1175

Environment plays a major role for determining the kind of courtship behaviours or alternative mating tactics employed, but the effect of physical variables on fitness has received little attention. The ... [more ▼]

Environment plays a major role for determining the kind of courtship behaviours or alternative mating tactics employed, but the effect of physical variables on fitness has received little attention. The Alpine newt courts during both day and night times and exhibits a complex suite of behaviours involving olfactory, visual and tactile cues. Displaying in both dark and light conditions may increase the number of mating opportunities and alleviate predation risk, but the frequency and efficacy of the various tactics deployed may vary across light conditions, leading males to vary their use of these tactics across different light regimes. To test this hypothesis, we video-recorded sexual encounters at two light intensities in a controlled experimental design. When courting in the dark, males used comparatively more olfactory rather than visual displays. They also relied more on positive feedback from the female before releasing a spermatophore for her to pick up. The particular mix of tactics used under each light condition is likely to be adaptive because in the dark (1) visual communication is hampered, making olfactory displays possibly more effective and (2) males depositing spermatophores are more likely to lose fertilizations to competitors. Mating in light and dark conditions has similar reproductive payoffs, which shows that displaying in the dark is not detrimental and may even be advantageous if predation risk is reduced at night. These results confirm the importance of taking into account physical variables to understand the evolution of sexual communication in animals. [less ▲]

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See detailLa disponibilité du phosphore dans les sols agricoles
Renneson, Malorie ULg

Scientific conference (2011, May 06)

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See detailLa disponibilité et le prix du foncier à vocation économique: quel impact sur le développement économique en Wallonie?
Vandermeer, Marie-Caroline ULg

Doctoral thesis (2016)

This doctoral dissertation concerns the policy of land production related to economic land in Wallonia. This policy corresponds to the development of economic estates by public authorities, through ... [more ▼]

This doctoral dissertation concerns the policy of land production related to economic land in Wallonia. This policy corresponds to the development of economic estates by public authorities, through economic development agencies, to accommodate businesses. It is based on the argument according to which the availability of land – cheap if possible – is an essential factor in territorial attractiveness and competitiveness. The reflections presented in this dissertation originate from the discrepancy between this argument and the scientific literature devoted to regional development. Indeed, unlike elected representatives and economic development agencies, scholars active in the field of regional sciences only very rarely refer to the impact of the land markets on levels of development. Rather than focusing on the theme of land prices and land availability, regional scientists underline the importance of intangible factors such as innovation, education, integration into networks, territorial identity, strategic management or governance. In view of this difference, it seems appropriate to assess the spatial and economic effectiveness of the Walloon policy of land production. To do this, our wish is to objectify the real role of the availability and the price of economic land on territorial development. The first part of the dissertation develops a reflection on the literature dedicated to the relationships between land and property markets and regional development. It leads to highlight the need to develop knowledge on the impact of land and property markets on business competitiveness, regional attractiveness and economic development. The second part is devoted to the study of the availability of economic land and aims to assess the spatial effectiveness and the economic effectiveness of policies which offer an important quantity of economic land. To do this, statistical analyses were conducted on two study areas: the Northwest Europe and Belgium. As regards spatial effectiveness, the results underline significant national differentials in terms of land consumption on the one hand, while highlighting the economic sprawl that characterises France and Belgium on the other hand. As regards economic effectiveness, our results show that the impact of the development of economic estates on growth depends largely on regional contexts. Our analyses identified three regional profiles. First, urban regions, where land availability only plays a marginal role, most likely owing to the presence of numerous activities that are not very extensive spatially, yet very productive in terms of added value. Secondly, intermediate regions, where the availability of economic land has a real impact on development. However, it would appear that the profile of these regions is adapted to the presence of activities which, like logistics, generate a limited amount of jobs and added value per surface unit. Thirdly, rural regions, where the opening of land to urbanisation does not deliver the desired results. In these regions, the availability of land is not a sufficient condition for economic growth and job creation. However, we have to precise that the Belgian rural regions are rather similar to intermediate regions, probably thanks to their good connectivity. The third part concerns the study of the economic land prices. It tends to assess the impact of these prices on company property costs. The developed statistical analysis is based on annual accounts of companies with one reporting unit localised in Walloon economic estates. Results suggest that property costs are rather low. On average, they represent 1.4% of all their operational costs and 5.4% of their added-values. By contrast, labour costs are eight times higher. In addition, our analyses suggest that an increase in land prices would have a limited impact on property costs. These results tend to invalidate the hypothesis that low land prices are a key determinant of regional development. Although, property costs are highly dependent on the business sector and the size of firms. For instance, for logistic companies and small firms, property costs represent more than 10% of their added-values and 2% to 5% of their operational costs. These results tend to highlight the fact that high land prices can have a negative impact on the development of these companies. As a final point, our conclusion discusses the recommendation that economic land supply policies must be adapted according to both, the profile of the territories and the profile of the firms. Indeed, in urban regions, land supply policies aiming to supply an important land supply at low price is probably inefficient from an economic standpoint. By contrast, economic development can be expected in intermediate regions with active land policies dedicated to land-intensive activities. Moreover, a specific attention should be paid to small companies. [less ▲]

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See detailDisponibilité et rétrogradation du phosphore dans le sol. Comment apprécier les analyses ?
Renneson, Malorie ULg

Conference given outside the academic context (2009)

Detailed reference viewed: 109 (1 ULg)
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See detailUn dispositif à visée professionnalisante
Beckers, Jacqueline ULg; Delchambre, Marie ULg; Lourtie, Emilie ULg

in Puzzle (2007), 22

Detailed reference viewed: 76 (7 ULg)
See detailLe dispositif carcéral : visages, corps et… liberté
Englebert, Jérôme ULg

Scientific conference (2014, January 31)

Detailed reference viewed: 45 (8 ULg)