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See detailFirst order elastic modeling of the Aden ridge propagation and the Anatolian extrusion process
Hubert, Aurelia ULg; King, G. C. P.; Manighetti, I. et al

in Geophysical Journal International (2003), 153

The evolution of the Gulf of Aden and the Anatolian Fault systems are modelled using the principles of elastic fracture mechanics usually applied to smaller scale cracks or faults. The lithosphere is ... [more ▼]

The evolution of the Gulf of Aden and the Anatolian Fault systems are modelled using the principles of elastic fracture mechanics usually applied to smaller scale cracks or faults. The lithosphere is treated as a plate, and simple boundary conditions are applied that correspond to the known plate boundary geometry and slip vectors. The models provide a simple explanation for many observed geological features. For the Gulf of Aden the model predicts why the ridge propagated from east to west from the Owen Fracture Zone towards the Afar and the overall form of its path. The smaller en echelon offsets can be explained by upward propagation from the initially created mantle dyke while the larger ones may be attributed to the propagating rupture interacting with pre-existing structures. For Anatolia the modelling suggests that the East Anatolian Fault was created before the North Anatolian Fault could form. Once both faults were formed however, activity could switch between them. The time scales over which this should take place are not known, but evidence for switching can be found in the historical seismicity. For Aden and Anatolia pre-existing structures or inhomogeneous stress fields left from earlier orogenic events have modified the processes of propagation and without an understanding of the existence of such features the propagation processes cannot be fully understood. Furthermore a propagating fault can extend into an active region where it would not have initiated. The North Anatolian Fault encountered slow but active extension when it entered the Aegean about 5 Ma and the stress field associated with the extending fault has progressively modified Aegean extension. In the central Aegean activity has been reduced while to the north-west on features such as the Gulfs of Evvia and Corinth activity has been increased. The field observation that major structures propagate and the success of simple elastic mod- els suggest that the continental crust behaves in an elastic-brittle or elastic-plastic fashion even though laboratory tests may be interpreted to suggest viscous behaviour. There are major prob- lems in scaling from the behaviour of small homogeneous samples to the large heterogeneous mantle and large-scale observations should be treated more seriously than extrapolations of the behaviour of laboratory experiments over many orders of magnitude in space and time. The retention of long-term elasticity and localised failure suggests a similar gross rheology for the oceanic and continental lithospheres. Even though it is incorrect to attribute differences in behaviour to the former being rigid (i.e. elastic) and the latter viscous, oceanic and continental lithosphere behave in different ways. Unlike oceanic crust, continental crust is buoyant and cannot be simply created or destroyed. The process of thickening or thinning works against gravity preventing large displacements on extensional or contractional features in the upper mantle. The equivalents of ridge or subduction systems are suppressed before they can accom- modate large displacements and activity must shift elsewhere. On the other hand, strike-slip boundaries and extrusion processes are favoured. [less ▲]

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See detailFirst paleoseismological constraints on the strongest earthquake in France (Provence) in the twentieth century
Chardon, D.; Hermitte, D.; Nguyen, Frédéric ULg et al

in Geology (2005)

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See detailFirst palynological record of the Silurian/Devonian boundary in the San Juan Precordillera, Argentina
Garcia Muro, V.J.; Rubinstein, C.V.; Steemans, Philippe ULg

Conference (2014)

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See detailFirst pilot trial of the STAR-Liege protocol for tight glycemic control in critically ill patients
Penning, Sophie ULg; Le Compte, Aaron J.; Moorhead, Katherine T. et al

in Computer Methods & Programs in Biomedicine (2011)

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See detailFirst practical implementation of the component method to joints in tubular construction
Weynand, K.; Busse, E.; Jaspart, Jean-Pierre ULg

in Proceedings of the 11th International Symposium on Tubular Structures (2006)

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See detailFirst principle study of nanodiamond optical and electronic properties
Raty, Jean-Yves ULg; Galli, G.

in Computer Physics Communications (2005), 169(1-3), 14-1919

Nanometer sized diamond has been found in meteorites, proto-planetary nebulae and interstellar dusts, as well as in residues of detonation and in diamond films. Remarkably, the size distribution of ... [more ▼]

Nanometer sized diamond has been found in meteorites, proto-planetary nebulae and interstellar dusts, as well as in residues of detonation and in diamond films. Remarkably, the size distribution of diamond nanoparticles appears to be peaked around 2-5 nm, and to be largely independent of preparation conditions. Using ab-initio calculations, we have shown that in this size range nanodiamond has a fullerene-like surface and, unlike silicon and germanium, exhibits very weak quantum confinement effects. We called these carbon nanoparticles bucky-diamonds: their atomic structure, predicted by simulations, is consistent with many experimental findings. In addition, we carried out calculations of the stability of nanodiamond, which provided a unifying explanation of its size distribution in extra-terrestrial samples, and in ultra-nano crystalline diamond (UNCD) films. [All rights reserved Elsevier] [less ▲]

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See detailFirst Principles Explanation of the Positive Seebeck Coefficient of Lithium
Xu, Bin ULg; Verstraete, Matthieu ULg

in Physical Review Letters (2014), 112

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See detailFirst Principles Study of the lattice instabilities in BaxSr1-xTiO3
Ghosez, Philippe ULg; Desquesnes, D.; Gonze, X. et al

in AIP Conference Proceedings (2000), 535

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See detailFirst principles study of the structural, electronic and thermoelectric properties of misfit cobaltite
Lemal, Sébastien ULg; Varignon, Julien ULg; Bilc, Daniel ULg et al

Poster (2014, December 03)

In the context of environmental issues that become more and more prevalent in our society, there has been recently an increase of interest for thermoelectric (TE) materials, which have the property to ... [more ▼]

In the context of environmental issues that become more and more prevalent in our society, there has been recently an increase of interest for thermoelectric (TE) materials, which have the property to convert heat into electricity, and vice-versa. Although they do not display exceptional thermopower (in comparison to best thermoelectric like bismuth telluride), oxide materials have attracted some attention for high-temperature TE applications, due to their high stability. Amongst them, CoO2-layered compounds were proposed as good p-type TE candidates. Still, these compounds have been only poorly characterized both theoretically and experimentally. In this work we report a first-principles study of misfit calcium cobaltite (Ca2CoO3)(CoO2)1.618 based on density functional theory and an hybrid functional. The computed structural, electronic and magnetic properties match well the avalaible experimental data. Then the thermoelectric properties can be deduced using the Boltzmann transport formalism within the constant relaxation time approximation and will be discussed. [less ▲]

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See detailFirst prototypes of vortex retarders obtained by polarization holography
Piron, Pierre ULg; Blain, Pascal ULg; Décultot, Marc ULg et al

in Proceedings of SPIE (2014, May), 9099

This paper will present the first prototypes of vortex retarders made of photo-orientable liquid crystals polymers recorded without mechanical action using only polarization holography. Vortex retarders ... [more ▼]

This paper will present the first prototypes of vortex retarders made of photo-orientable liquid crystals polymers recorded without mechanical action using only polarization holography. Vortex retarders are birefringent plates characterized by a uniform phase retard and a rotation of their fast axis along their center. Liquid crystals are anisotropic molecules possessing birefringent properties. They are locally orientable and their orientation defines the fast axis orientation of the retarder. Their alignment depends on the local orientation of the recording electric field. The superimposition of several polarized beams will be used to shape the electric field to achieve the recording of vortex retarders. The mathematical aspects of the superimposition process, as well as several numerical simulations are exposed. Finally, the first prototypes are presented, characterized and compared to the numerical simulations. [less ▲]

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See detailFirst record of Demosponge spicules in a late Devonian stromatoporoid basal skeleton (Frasnian, Belgium).
Reitner; Da Silva, Anne-Christine ULg; Kershaw et al

in Abstracts: Ninth world sponge conference 2013 (2013)

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See detailFirst record of Rellimia Leclercq & Bonamo (Aneurophytales) from Gondwana, with comments on the earliest lignophytes.
Gerrienne, Philippe ULg; Meyer-Berthaud, Brigitte; Lardeux, Hubert et al

in Special Publication - Geological Society of London (2010), 339

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See detailFirst record of the 'bathroom mothmidge' Clogmia albipunctata, a conspicuous element of the Belgian fauna that went unnoticed (Diptera: Psychodidae)
Boumans, Louis; Zimmer, Jean-Yves ULg; Verheggen, François ULg

in Phegea (2009), 37(4), 153-160

The 'bathroom fly' Clogmia albipunctata (Williston, 1893) (Diptera: Psychodidae) is a cosmopolitan species that is commonly found in bathrooms, kitchens, sewage treatment plants and compost heaps. Of ... [more ▼]

The 'bathroom fly' Clogmia albipunctata (Williston, 1893) (Diptera: Psychodidae) is a cosmopolitan species that is commonly found in bathrooms, kitchens, sewage treatment plants and compost heaps. Of circumtropical origin, the species probably spread to synanthropic habitats in northern and central Europe during the past decades. The first documented findings in Belgium are discussed, together with general information on the biology and recognition of the species. [less ▲]

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See detailFirst report of a fatal autochthonous canine Angiostrongylus vasorum infection in Belgium
Jolly, Sandra ULg; Poncelet, Luc; Lempereur, Laetitia ULg et al

in Parasitology International (2014)

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See detailFirst report of banana mild mosaic virus infecting plantain in Ivory Coast
Kouadio, Kouakou Théodore ULg; Agneroh, Thérèse Atcham; De Clerck, Caroline ULg et al

in Plant Disease (2013), 97(5), 693

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See detailFirst report of cucurbit aphid-borne yellows virus in Tunisia causing yellows on five cucurbitacious species
Mnari Hattab, M.; Kummert, J.; Roussel, S. et al

in Plant Disease (2005), 89

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See detailFirst Report of Fusarium Head Blight (FHB) on Winter Wheat in the Grand Duchy of Luxembourg
Giraud, Frédéric; Vrancken, Carine; Delfosse, Philippe et al

in Plant Disease (2008), 92

Detailed reference viewed: 12 (2 ULg)