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See detailHybridization of short complementary PNAs to G-quadruplex forming oligonucleotides: An electrospray mass spectrometry study.
Amato, Jussara; Oliviero, Giorgia; De Pauw, Edwin ULg et al

in Biopolymers (2009), 91(4), 244-255

We investigated the interaction of the short PNA strand [acccca]-PNA with oligodeoxynucleotides containing one, two, or four tracts of TGGGGT units. Electrospray ionization mass spectrometry allowed ... [more ▼]

We investigated the interaction of the short PNA strand [acccca]-PNA with oligodeoxynucleotides containing one, two, or four tracts of TGGGGT units. Electrospray ionization mass spectrometry allowed exploring the wide variety of complex stoichiometries that were found to coexist in solution. In water, the PNA strand forms short heteroduplexes with the complementary DNA sequences, but higher-order structures are also found, with PNA(2n)*DNA(n) triplex units, culminating in precipitation at very low ionic strength. In the presence of ammonium acetate, there is a competition between PNA*DNA heteroduplex formation and DNA G-quadruplex formation. Heteroduplex formation is favored when the PNA + DNA mixture in ammonium acetate is heated and cooled at room temperature, but not if the PNA is added at room temperature to the pre-formed G-quadruplex. We also found that the short [acccca]-PNA strand binds to G-quadruplexes. (c) 2008 Wiley Periodicals, Inc. Biopolymers, 2008. [less ▲]

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See detailHybridization on bovine enterotoxigenic Escherichia coli with two heat-stable enterotoxin gene probes
Mainil, Jacques ULg; Bex, F.; Couturier, M. et al

in American Journal of Veterinary Research (1985), 46

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See detailHybridization success of three common European cyprinid species, Rutilus rutilus, Blicca bjoerkna and Abramis brama and larval resistance to stress tests
Nzau Matondo, Billy; Ovidio, Michaël ULg; Poncin, Pascal ULg et al

in Fisheries Science (2007), 73(5), 1137-1146

Hybridization success at early developmental stages and larval resistance to osmotic, thermal and fasting tests in roach Rutilus rutilus, silver bream Blicca bjoerkna, common bream Abramis brama and their ... [more ▼]

Hybridization success at early developmental stages and larval resistance to osmotic, thermal and fasting tests in roach Rutilus rutilus, silver bream Blicca bjoerkna, common bream Abramis brama and their F1 hybrids were investigated. Results revealed that hybrid survival rates were similar to parents. At the eyed embryo stage, however, a maternal effect was observed as a general trend during hatchling and larval stages. After these stages, hybrids displayed a higher survival rate than their parents. Under stress tests, no survival was observed after 40 min for osmotic and thermal shocks and after 24 days for the prolonged fasting test in these species and their F1 hybrids. The median survivals of hybrids were intermediate between the two parents. For total mortality, hybrids were also affected by a maternal effect but to the advantage of the hybrids. [less ▲]

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See detailHydoelastic analysis using the finite element method
Piret, G.; Debongnie, Jean-François ULg; Géradin, Michel ULg

Report (1992)

Part 1 : The finite element formulation for fluid-structure problems - To the best of our knowledge, the first purely lagrangian formulation was proposed by Debongnie. At this time, even though natural ... [more ▼]

Part 1 : The finite element formulation for fluid-structure problems - To the best of our knowledge, the first purely lagrangian formulation was proposed by Debongnie. At this time, even though natural, this idea as well as the notion of displacement potential led to some surprises. Thes rationalizing efforts led to the final formulation of the corrected Tong's formulation in 1978 and to the corresponding formulation for the compressible case in 1984. Similar results were obtained by Morand in 1987. Here, contrarily to our preceeding papers, we present the formulation from a local point of view instead of a variational one. PART 2 : On the representation of rigid body modes with the SAMCEF formulation for hydroelastic problems - The question to see wether the SAMCEF formulation of hydroelastic problems respects the rigid body modes is often raised. It appear very often that some of the rotational rigid body modes are lost for the fre-free problem. The present report tries to give a better understanding of this problem. PART 3 - Dynamic analysis of fluid-structure problems : results. [less ▲]

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See detailHydratation and electrolyte balance in horses during an endurance season
Robert, Céline; Goachet, Anne-Gaëlle; Fraipont, Audrey ULg et al

in Equine Veterinary Journal. Supplement (2010), 42(38), 98-104

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See detailHydrates de gaz dans les noyaux cométaires et les grains interstellaires
Delsemme, A.-H.; Swings, Polydore ULg

in Annales d'astrophysique (1952), 15(1), 1-6

Solid hydrates of CH4, CO2, ... may be present in cometary nuclei and interstellar grains. The vapor pressures — hence the rates of sublimation — of the various hydrates are of the same order of magnitude ... [more ▼]

Solid hydrates of CH4, CO2, ... may be present in cometary nuclei and interstellar grains. The vapor pressures — hence the rates of sublimation — of the various hydrates are of the same order of magnitude while the vapor pressures of solid CH4, H2O, ... differ by very large factors. The relative abundances of the radicals which are observed in comets would be explained more satisfactorily by assuming the presence of solid hydrates. [less ▲]

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See detailHydration kinetics of compacted low-density bentonite
Dieudonné, Anne-Catherine ULg; Romero, Enrique; Charlier, Robert ULg

in Khalili, Nasser; Russel, Adrian; Khoshghalb (Eds.) Unsaturated Soils: Research and Applications (2014)

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See detailHydraulic behavior of Piano Key Weirs: experimental approach
Machiels, Olivier ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Janssen, Robert; Chanson, Hubert (Eds.) 3rd Int. Junior Researcher and Engineer Worjshop on Hydraulic Structures (2010, May)

The Piano Key Weir (PKW) is a particular geometry of weir similar to a labyrinth shape that features overhanging cycle ends to reduce the base length. Together with its high discharge capacity for low ... [more ▼]

The Piano Key Weir (PKW) is a particular geometry of weir similar to a labyrinth shape that features overhanging cycle ends to reduce the base length. Together with its high discharge capacity for low heads, this geometric feature makes the PKW an interesting solution for dam rehabilitation, permitting the placement of the weir directly on dam crest. However, PKW stays a new type of weir, firstly designed in 2001 and built for the first time in 2006 by Electricité de France (EDF). Even if the first experimental studies confirmed its discharge capacities, lacks persist in the understanding of the flow behaviour upstream, along and downstream of this complex structure. This paper presents the mean results and observations obtained from experiments on a large scale model of PKW. The hydraulics of the structure is clarified based on measurements of water depths, pressures, velocities and discharges on each part of the weir. These observations explain the effect of geometric improvements proposed in former studies. [less ▲]

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See detailHydraulic behaviour of greened porous pavements: a physical study
Straet, Frederic; Beckers, Eléonore ULg; Degre, Aurore ULg

(2008)

Detailed reference viewed: 56 (17 ULg)
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See detailHydraulic modelling in civil and environmental engineering
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

Scientific conference (2013, May 08)

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See detailHydraulic modelling along river Ourthe
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2007, June 01)

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See detailHydraulic modelling along river Ourthe considering impacts of climate change
Dewals, Benjamin ULg

Conference (2007, June 01)

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See detailHydraulic modelling of Piano Key Weirs: a composite approach
Erpicum, Sébastien ULg; Machiels, Olivier ULg; Archambeau, Pierre ULg et al

in Proceedings of International workshop on Piano Key Weir for In-stream Storage and Dam Safety - PKWISD-2012 (2012, May)

During the last few years, several piano key weirs (PKWs) have been built in France and abroad. Thanks to the reduced footprint and high release capacities of this new type of weir, making it particularly ... [more ▼]

During the last few years, several piano key weirs (PKWs) have been built in France and abroad. Thanks to the reduced footprint and high release capacities of this new type of weir, making it particularly suited for concrete dams rehabilitation, lots of other projects in various countries are under construction or study. The prototype use of PKW requires knowledge about its structural behaviour, hydraulic capacities as well as integration into dams’ environment. This paper aims at presenting numerical and physical modelling works performed at the University of Liege to address the last two items. In particular, large scale physical modelling and parametric scale models have enabled to understand the hydraulic behaviour of the structure and to highlight its most influencing geometric parameters as well as their best variation interval depending on various criteria related to the weir design (discharge efficiency, cost…). A 1D numerical model has also been developed based on these experimental investigations. It enables to predict in a few minutes, with 10% accuracy, the discharge capacity of a given PKW geometry within its usual range of operation head. This model, available as a freeware from http://www.pk-weirs.ulg.ac.be, constitutes a key tool for the first design of such weirs. Finally, the scale model studies of major projects such as Raviège dam (France) for Electricité de France - EDF and Ouldjet Mellegue Project (Algeria) for Coyne et Bellier – Tractebel Engineering enable to confront theoretical predictions with experimental results and to address the problem of PKW integration on dam crests. [less ▲]

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See detailHydraulic modelling of the river Meuse
Dewals, Benjamin ULg; Huismans; Stilmant, Frédéric ULg et al

Conference (2013, September)

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See detailHydraulic studies for the Taoussa project, Mali
Erpicum, Sébastien ULg; Dewals, Benjamin ULg; Archambeau, Pierre ULg et al

in Proceedings of Africa 2013 conference (CD-Rom) (2013)

The Taoussa Project is a component of a large development scheme of the Niger River in the north-eastern part of Mali aiming at reducing desertification and improving socio-economic activity. It is mainly ... [more ▼]

The Taoussa Project is a component of a large development scheme of the Niger River in the north-eastern part of Mali aiming at reducing desertification and improving socio-economic activity. It is mainly made of a rockfill dam with central core around 18 m high and 1,000 m long across the valley of the Niger River, 130 km upstream of the town of Gao in the eastern part of Mali. The dam is equipped with a 25 MW hydroelectric power plant, a lock, a dock and a spillway. The spillway is made of a gated ogee crested weir divided into 10 bays and a downstream stilling basin, with a maximum discharge capacity of 3,100 m³/s. 210 km of high tension overhead cables and a 130 km long road complete the Project. The multipurpose Taoussa dam will enable the sustainable development of the Project area by securing water resources, increasing low-water level discharges downstream, creating a link between road and fluvial transports (dock) and producing electricity. The Ministère de l’Energie, des Mines et de l’Eau du Mali - Autorité pour l’Aménagement de Taoussa -commissioned Coyne et Bellier – Tractebel Engineering in 2006 to perform the detailed studies for the Project. In this framework, the hydraulic studies have been performed by the Laboratory of Engineering Hydraulics (HECE) of the University of Liege. These hydraulic studies, depicted in details in the paper, have been carried out successively by two complementary approaches: a first step realized on the basis of numerical modelling to study the flows at the scale of the reservoir and the river, and a second experimental investigation, using a scale model, to analyse in details the spillway operation conditions. They consider varied problems from large scale flow conditions in the reservoir during the spillway operation and hydrodynamic interactions between the dam, the lock and the hydroelectric power plant to validation and optimization of the hydraulic design and dimensions of the gated spillway and the stilling basin or release conditions downstream of the project structures, including the temporary derivation stage. [less ▲]

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See detailHydraulique Appliquée
Pirotton, Michel ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

Learning material (2007)

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See detailHydraulique Urbaine
Pirotton, Michel ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

Learning material (2008)

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See detailHydro and Hydro-Mechanical Modelling of Ventilation Test in Clayey Rocks
Pardoen, Benoît ULg; Talandier, Jean; Charlier, Robert ULg et al

in Mancuso, Claudio; Jommi, Cristina; D'Onza, Francesca (Eds.) Unsaturated Soils: Research and Applications (2012)

Hydro and hydro-mechanical numerical modellings are performed in order to acquire a better understanding of clayey rock behaviour and transfers occurring during an in situ ventilation test. The test is ... [more ▼]

Hydro and hydro-mechanical numerical modellings are performed in order to acquire a better understanding of clayey rock behaviour and transfers occurring during an in situ ventilation test. The test is performed in an experimental gallery that is part of an underground research laboratory. A biphasic flow model for unsaturated soil and an elasto-plastic constitutive law are used for the host formation. The models include exchange condition of fluid mass, anisotropy and the excavation damaged zone around the gallery. Finally, the ventilation test is reproduced and the model is calibrated based on the matching between numerical results and experimental measurements. [less ▲]

Detailed reference viewed: 50 (25 ULg)