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See detailDistributed fiber-optic temperature sensing for hydrologic systems
Selker, John S.; Thévenaz, Luc; Huwald, Hendrik et al

in Water Resources Research (2006), 42(12), 12202

Instruments for distributed fiber-optic measurement of temperature are now available with temperature resolution of 0.01°C and spatial resolution of 1 m with temporal resolution of fractions of a minute ... [more ▼]

Instruments for distributed fiber-optic measurement of temperature are now available with temperature resolution of 0.01°C and spatial resolution of 1 m with temporal resolution of fractions of a minute along standard fiber-optic cables used for communication with lengths of up to 30,000 m. We discuss the spectrum of fiber-optic tools that may be employed to make these measurements, illuminating the potential and limitations of these methods in hydrologic science. There are trade-offs between precision in temperature, temporal resolution and spatial resolution, following the square root of the number of measurements made; thus brief, short measurements are less precise than measurements taken over longer spans in time and space. Five illustrative applications demonstrate configurations where the distributed temperature sensing (DTS) approach could be used: (1) lake bottom temperatures using existing communication cables, (2) temperature profile with depth in a 1400 m deep decommissioned mine shaft, (3) air-snow interface temperature profile above a snow-covered glacier (4) air-water interfacial temperature in a lake, and (5) temperature distribution along a first-order stream. In examples 3 and 4 it is shown that by winding the fiber around a cylinder, vertical spatial resolution of millimeters can be achieved. These tools may be of exceptional utility in observing a broad range of hydrologic processes including evaporation, infiltration, limnology, and the local and overall energy budget spanning scales from 0.003 to 30,000 m. This range of scales corresponds well with many of the areas of greatest opportunity for discovery in hydrologic science. [less ▲]

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See detailAdvanced particle characterization for improved; understanding of spray coating quality
Pirard, Eric ULg; Campana, Florent; Janssen, Jean-Pierre

in Proceedings International Thermal Spray Conference (2006)

The size and shape of individual particles are essential characteristics to control their behavior during spraying. Thanks to recently available technology in powder image analysis, this paper ... [more ▼]

The size and shape of individual particles are essential characteristics to control their behavior during spraying. Thanks to recently available technology in powder image analysis, this paper investigates the correlation between the geometric properties of several thousands of particles and their flowability (Hall flowmeter) and apparent density (Scott volumeter). Four different chromium carbide Cr3C2-NiCr 75/25 powders used for HVOF wear / oxidation resistant coatings are studied. The coating quality obtained for each powder by the HVOF spraying process is further investigated using metallographic image analysis. [less ▲]

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See detailHomenaje conmemorativo a Manuel Sacristán
Ceballos Viro, Alvaro ULg

in Revista de Hispanismo Filosófico (2006)

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See detailMultifunctional landscapes. Volume III. Continuity and change (Ü. Mander, M. Antrop).
Bogaert, Jan ULg

in Landscape Ecology (2006), 21

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See detailQuand l'incontinentia pigmenti défie un dogme.
Willemaers, Valentine; Lizin, V. A.; Quatresooz, Pascale ULg et al

in Dermatologie Actualité (2006), 95

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See detailSocial Insurance and Redistribution with Moral Hazard and Adverse Selection
Boadway, Robin; Leite-Monteiro, Manuel; Pestieau, Pierre ULg et al

in Scandinavian Journal of Economics (2006), 108(2), 279-298

Rochet (1991) showed that with distortionary income taxes, social insurance is a desirable redistributive device when risk and ability are negatively correlated. This finding is re-examined when ex post ... [more ▼]

Rochet (1991) showed that with distortionary income taxes, social insurance is a desirable redistributive device when risk and ability are negatively correlated. This finding is re-examined when ex post moral hazard and adverse selection are included, and under different informational assumptions. Individuals can take actions influencing the size of the loss in the event of accident (or ill health). Social insurance can be supplemented by private insurance, but private insurance markets are affected by both adverse selection and moral hazard. We study how equity and efficiency considerations should be traded off in choosing the optimal coverage of social insurance when those features are introduced. The case for social insurance is strongest when the government is well informed about household productivity. [less ▲]

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See detailEuropean Foreign Exchange Risk Exposure
Muller, Aline ULg; Verschoor, Willem

in European Financial Management (2006), 12(2), 195-220

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See detailCollagen fibril arabesques in connective tissue disorders.
Hermanns-Lê, Trinh ULg; Pierard, Gérald ULg

in American Journal of Clinical Dermatology (2006), 7(5), 323-6

BACKGROUND: In various connective tissue disorders, collagen fibrils and elastic fibers may exhibit some ultrastructural abnormalities. OBJECTIVE: This electron microscopy study focused on collagen fibril ... [more ▼]

BACKGROUND: In various connective tissue disorders, collagen fibrils and elastic fibers may exhibit some ultrastructural abnormalities. OBJECTIVE: This electron microscopy study focused on collagen fibril orientation and unusual shapes in the dermis of Ehlers-Danlos syndrome (EDS) and related entities, including spontaneous cervical artery dissection syndrome and recurrent preterm premature rupture of fetal membranes syndrome. RESULTS: In addition to some abnormal fibril shapes typically found in these syndromes, other conformations (hook shaped, S shaped, ring shaped) that have not been illustrated previously in the literature were observed. CONCLUSION: The abnormal collagen fibril conformations observed in EDS and other related conditions characterized by tissue fragility likely affect both the internal cohesiveness of the bundles and the mechanobiologic properties of the tissue. [less ▲]

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See detailIntratissular Lymphaticovenous Anastomoses Demonstrated by Perioperative Intramuscular Injection of 99mtc-Colloids
Heymans, Olivier; Fallais, Charles ULg; Hustinx, Roland ULg

in Lymphatic Research and Biology (2006), 4(1, Spring), 29-33

BACKGROUND: The existence of intratissular lymphaticovenous anastomoses has often been suggested, but it has never been demonstrated. This study aims at demonstrating the presence of such anastomoses ... [more ▼]

BACKGROUND: The existence of intratissular lymphaticovenous anastomoses has often been suggested, but it has never been demonstrated. This study aims at demonstrating the presence of such anastomoses. METHODS AND RESULTS: The free flap model was used to investigate the drainage of radiolabeled colloid particles whose size prevents direct passage to the blood vessels. The tracer was injected into the muscle or the skin during the surgical procedure. Blood samples were sequentially drawn from the venous pedicle over the 30 minutes that followed the tracer injection. The blood samples were counted using a gamma well-counter. In all 14 patients, the venous blood radioactivity steadily increased over time. Radiochemical analyses performed on the blood samples demonstrated that the radioactivity is related to the labeled colloids and not to free pertechnetate. Planar imaging performed 24 hours after the surgical procedure showed a significant liver uptake, and no accumulation in the area of normal lymphatic relays. CONCLUSIONS: As, in the free flap model, there is no lymphatic drainage through the classical pathways whatsoever, and since the size of the radiolabeled particles prevents them from directly entering the blood stream, the results strongly suggest the presence of functional intratissular lymphovenous anastomoses. [less ▲]

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See detailIdentification of groundwater quality trends in a chalky aquifer threatened by intensive agriculture
Batlle-Aguilar, Jordi; Orban, Philippe ULg; Dassargues, Alain ULg et al

in Stauffer, Fr.; Dassargues, Alain (Eds.) Quantitative Geology from Multiple Sources: S10 Use of multiple sources in conditioning/calibrating groundwater flow and transport models (2006)

Diffuse groundwater contamination related to agricultural practices is a worldwide environmental problem, particularly the continuous increase in nitrate concentrations. As a response to this threat, the ... [more ▼]

Diffuse groundwater contamination related to agricultural practices is a worldwide environmental problem, particularly the continuous increase in nitrate concentrations. As a response to this threat, the European Union has adopted directives requiring that Member States take measures to reduce agricultural nitrate sources and stating that a “good” status of groundwater is required for all EU members. In order to achieve the environmental objectives for groundwater, the identification and reversal of any significant upward trend in the pollutant concentrations are required. Conclusions are drawn about the evolution of groundwater contamination by nitrates in the following decades with respect to the EU Water directive prescriptions. Measures have to be urgently taken in order to avoid major degradation of groundwater in 10 to 70 years. However, a good groundwater quality status cannot be expected for the 2015 EU Water Framework Directive (WFD). [less ▲]

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See detailProduction, gestion et utilisation des outillages lithiques du Chasséen méridional
Gassin, Bernard; Léa, Vanessa; Linton, Jimmy ULg et al

in Astruc, Laurence (Ed.) Normes techniques et pratiques sociales de la simplicité des outillages pré- et protohistoriques. Actes des XXVIe rencontres d’archéologie et d’histoire d’Antibes (2006)

Is the opposition between specialized and non specialized productions a key to charac- terize the lithic assemblages from the southern Chassey Culture ? The former have been used to define the culture ... [more ▼]

Is the opposition between specialized and non specialized productions a key to charac- terize the lithic assemblages from the southern Chassey Culture ? The former have been used to define the culture itself and to build up theories based on craft specialization to approach the social organization of these Neolithic groups. Our first studies about the latter show that they reveal specific technical activities conducted at the site or that they are useful to build up interpretation on both site functions and social organization. We base our study on a corpus of sites localized in the south of France–from Alpes- Maritimes to Lot–between 4300 and 3500 BC cal. Different site function are here repre- sented and these sites are situated at different levels in the area of bedoulien flint diffu- sion, from the production zone to the border of the diffusion area : when and where do the different degrees of know-how appear ? How far are the consumption modes (i.e., tool curation and use) directly related to the production modes ? [less ▲]

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See detailLes grandes lignes de l'interprétation heideggérienne de la monadologie
Pieron, Julien ULg

in M. S. Alves, Pedro; Santos, José Manuel; Sá, Alexandre Franco de (Eds.) Humano e Inumano. A Dignidade do Homem e os Novos Desafios (Actas do Segundo Congresso Internacional da Associação Portuguesa de Filosofia Fenomenológica) (2006)

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See detailStealth Distributed Hash Table: A robust and flexible super-peered DHT
Brampton, A.; MacQuire, A.; Rai, I. A. et al

in Proceedings of the 2006 ACM CoNEXT conference (2006)

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See detailDiagnostic de la pollution intérieure
Nicolas, Jacques ULg; Romain, Anne-Claude ULg

Report (2006)

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See detailThe left intraparietal sulcus and verbal short-term memory: Focus of attention or serial order ?
Majerus, Steve ULg; Poncelet, Martine ULg; Van der Linden, Martial ULg et al

in Neuroimage (2006), 32(2), 880-891

One of the most consistently activated regions during verbal short-term memory (STM) tasks is the left intraparietal sulcus (IPS). However, its precise role remains a matter of debate. While some authors ... [more ▼]

One of the most consistently activated regions during verbal short-term memory (STM) tasks is the left intraparietal sulcus (IPS). However, its precise role remains a matter of debate. While some authors consider the IPS to be a specific store for serial order information, other data suggest that it serves a more general function of attentional focalization. In the current fMRI experiment, we investigated these two hypotheses by presenting different verbal STM conditions that probed recognition for word identity or word order and by assessing functional connectivity of the left IPS with distant brain areas. If the IPS has a role of attentional focalization, then it should be involved in both order and item conditions, but it should be connected to different brain regions, depending on the neural substrates involved in processing the different types of information (order versus phonological/orthographic) to be remembered in the item and order STM conditions. We observed that the left IPS was activated in both order and item STM conditions but for different reasons: during order STM, the left IPS was functionally connected to serial/temporal order processing areas in the right IPS, premotor and cerebellar cortices, while during item STM, the left IPS was connected to phonological and orthographic processing areas in the superior temporal and fusiform gyri. Our data support a position considering that the left IPS acts as an attentional modulator of distant neural networks which themselves are specialized in processing order or language representations. More generally, they strengthen attention-based accounts of verbal STM. [less ▲]

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See detailTime series of the partial pressure of carbon dioxide (2001 2004) and preliminary inorganic carbn budget in the Scheldt plume (Belgian coastal waters)
Schiettecatte, L.-S.; Gazeau, F.; van der Zee, C. et al

Poster (2006)

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