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Peer Reviewed
See detailMechanical characterization of porous structures by the combined use of micro-CT and in-situ loading
Kerckhofs, Greet ULg; Schrooten, Jan; Elicegui, Laida et al

Conference (2008)

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See detailMechanical characterization of porous structures by the combined use of micro-CT and in-situ loading
Kerckhofs, Greet ULg; Schrooten, Jan; Elicegui, Laida et al

in Proceedings book WCNDT 2008 (2008)

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See detailMechanical comparison of eight vertical jump exercises
Jidovtseff, Boris ULg; Cronin, John; Harris, Nigel et al

in Computer Methods in Biomechanics & Biomedical Engineering (2010, September), 13(S1), 77-78

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See detailMechanical constitutive framework for thermal effects on unsaturated soils.
François, Bertrand ULg; Nuth, Mathieu; Laloui, Lyesse

in Proceeding of the 10th Int. Symp. on Numerical Models in Geomechanics, NUMOG X (2007)

Research interest in the thermo-mechanical behaviour of unsaturated soils is growing as a result of an increasing number of geomechanical problems involving both thermal and suction effects. The ... [more ▼]

Research interest in the thermo-mechanical behaviour of unsaturated soils is growing as a result of an increasing number of geomechanical problems involving both thermal and suction effects. The underground waste disposal is one such critical problem. Until now, these two environmental loadings have often been considered independently. This paper proposes a new unified thermo-mechanical framework for unsaturated soils based on thermo-hydro-mechanical (THM) experimental evidence on cohesive soils. The Bishop effective stress framework is adopted to represent the stress state in the soil in a unified fashion. This constitutive context based on the evolution of two key parameters (the preconsolidation pressure and the suction air-entry value) makes it possible to represent the main features of the thermo-mechanical behaviour of unsaturated soils. [less ▲]

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See detailThe mechanical control of peri-implant bone remodeling investigated by in vivo imaging and in silico modeling
Li, Zihui; Betts, Duncan; Kuhn, Gisela et al

Conference (2016, July)

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See detailMechanical design, control and optimization of a hybrid solar microgrid for rural electrification and heat supply in sub-Saharan Africa
Altés Buch, Queralt ULg

Master's dissertation (2016)

This thesis aims at developing, optimizing and controling a hybrid solar microgrid for rural electrification and heat supply in sub-Saharan Africa. The considered system includes PV, Parabolic Trough ... [more ▼]

This thesis aims at developing, optimizing and controling a hybrid solar microgrid for rural electrification and heat supply in sub-Saharan Africa. The considered system includes PV, Parabolic Trough Collectors, Organic Rankine Cycle and LPG generator, as well as chemical battery storage and thermal energy storage. The work focuses on multiple aspects of the ongoing development of solar hybrid microgrids for the rural electrification of remote areas in Lesotho. These aspects range from very specific improvements (the mechanical design of a high expansion ratio expander) to the more global evaluation of their impact once included into a complex micro-grid system. Special attention has also been paid to the links between thermal and electrical demands. The main contributions of this thesis are: – The mechanical design of a high expansion ratio scroll expander, involving drawing, machining and assembly of the parts. – The detailed model of an organic Rankine cycle with the purpose of evaluating the improvement brought by the high expansion ratio scroll expander and mapping the ORC performance. – A building model developed to predict the thermal loads of a health clinic in rural communities of Lesotho. The developed lumped-parameter model can be used for various building typologies and communities. The model is designed to be as generic and simple as possible, and contrasts with the data-intensive models generally proposed in the literature. – The gathering of monitoring and weather data relative to a health clinic in Lesotho, and their use for the calibration of the building model. – A microgrid model built by interconnecting all of its subcomponent models. A rule- based control strategy is developed, accounting for interactions between thermal and electrical loads, and dispatching heat and power flows of each component in order to cover the demand while minimizing the fuel consumption. – A particle-swarm optimization model used to optimize the microgrid under different cost assumptions and control strategies. The above models prove that the system performs better with the developed high expansion ratio expander. The maximum output power of the ORC is increased by 33%, and the fuel consumption of the microgrid is reduced by 25%. For the studied community of Ha Nkau in Lesotho, the determined optimal system infrastructure is composed of PV (65 kW) and batteries (259 kWh) only, and the optimum control strategy achieves a levelized cost of electricity of 0.202 USD/kWh. Fuel consumption is mainly due to the burner, which supplies all the thermal load because no other heating system is selected by the optimization. [less ▲]

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See detailThe mechanical effects of short-circuit currents in open air substations (Part II)
Lilien, Jean-Louis ULg; Declercq, Guy; El adnani, Mustapha et al

Book published by CIGRE (2002)

This book is a companion book of teh CIGRE brochure N° 105 (1996) on the same subject. It evaluates short-circuit mechanical effects and corresponding design loads in substation. It includes both rigid ... [more ▼]

This book is a companion book of teh CIGRE brochure N° 105 (1996) on the same subject. It evaluates short-circuit mechanical effects and corresponding design loads in substation. It includes both rigid and flexible bus-bars, Ac and DC network. It is divided in two volumes, the second one is giving numerous data and tests results of short-circuit. The first volume is detailing methods (simplified, medium and advanced ) to solve these problems. [less ▲]

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See detailThe mechanical effects of short-circuit currents in open air substations (Rigid and Flexible bus-bars)
Lilien, Jean-Louis ULg; declercq, Guy; El Adnani, Mustapha et al

Book published by CIGRE (1996)

A full revision of the 1987 version of the same brochure,including new development on bundle conductors and a full data base of tests.It includes short-circuit mechanical effects in substations for AC and ... [more ▼]

A full revision of the 1987 version of the same brochure,including new development on bundle conductors and a full data base of tests.It includes short-circuit mechanical effects in substations for AC and DC structures, for rigid and flexible busbars. [less ▲]

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See detailThe mechanical effects of short-circuit currents in open air substations.
Nartowski, Zbigniew; Adami, H.; Ford, Gary et al

Book published by CIGRE (1987)

SHort-circuit mechanical effects in substation is investigated by tests and simulations. Simplified equations are deduced to prepare standardisation of a procedure forthe design of substation against ... [more ▼]

SHort-circuit mechanical effects in substation is investigated by tests and simulations. Simplified equations are deduced to prepare standardisation of a procedure forthe design of substation against short-circuit mechanicle effects. [less ▲]

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See detailThe mechanical effects of short-circuit currents in substations with flexible conductors. Numerical Methods - Computer Approach.
Lehmann, Werner; Lilien, Jean-Louis ULg; Orkisz, J.

in Proceedings of CIGRE 1982 (1982, September 01)

A review of the application of advanced computer methods to the evaluation of the mecanical effects caused by the electromagnétic forces associated with short-circuit currents.

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See detailMechanical effects of short-circuit currents in substations with strain bus systems. Medium complexity calculation methods.
Gauffin, Louis; Lilien, Jean-Louis ULg

in Proceedings of the CIGRE Symposium 06-85 (1985)

This paper details various methods (medium complexity) for calculation of conductor tensions and displacements of substation under short-circuit loading.

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See detailMechanical effects of short-circuit currents in substations with strain bus systems. Parameter Analysis and simple method of calculation.
Lilien, Jean-Louis ULg; Brokamp, Luc

in Proceedings of the CIGRE Symposium 06-85 (1985, June)

SImple methods to evaluate short-circuit mechanical effects in substation.

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See detailMechanical evaluation of a thermoplastic casting material.
Claeys, Stéphanie ULg; Meuron, M.; Boeraeve, P. et al

in Veterinary Record : Journal of the British Veterinary Association (2007), 161(7), 238-40

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See detailMechanical Flow Obstruction after Heart Transplantation Diagnosed by Tee
CANIVET, Jean-Luc ULg; DEFRAIGNE, Jean ULg; Demoulin, Jean-Claude et al

in Annals of Thoracic Surgery (1994), 58(3), 890-1

We report a case of mechanical flow obstruction after heart transplantation caused by a prominent left atrium suture with a "pursestring" effect. The diagnosis was achieved by transesophageal ... [more ▼]

We report a case of mechanical flow obstruction after heart transplantation caused by a prominent left atrium suture with a "pursestring" effect. The diagnosis was achieved by transesophageal echocardiography. The mean transstenotic gradient was measured at 13 mm Hg. Because of the profound hemodynamic and multisystemic failure, no surgical correction was attempted. The postmortem examination confirmed the stenosis at the level of the left atrium. [less ▲]

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See detailMechanical loading affects angiogenesis and osteogenesis in an in vivo bone chamber: a modeling study.
Geris, Liesbet ULg; Vandamme, Katleen; Naert, Ignace et al

in Tissue Engineering. Part A (2010), 16(11), 3353-3361

Despite a myriad of studies confirming the interaction between biology and mechanics, the exact nature of the main mechanical stimuli and their influence on the bone regeneration processes are still ... [more ▼]

Despite a myriad of studies confirming the interaction between biology and mechanics, the exact nature of the main mechanical stimuli and their influence on the bone regeneration processes are still unclear. The hypothesis of this study was that the outcome of peri-implant healing under different implant loading regimens can be explained by the influence of fluid flow on the combination of angiogenesis and osteogenesis through its influence on cell proliferation and differentiation. To investigate this hypothesis a mathematical model of bone regeneration was applied to simulate the peri-implant healing in an in vivo repeated sampling bone chamber for different axial micromechanical implant loading regimes. When mechanical loading was modeled to influence both osteogenic and angiogenic processes, a good agreement was observed between simulations and experiments concerning the amount of bone in the bone chamber, its radial and longitudinal distribution, and the bone-implant contact for different implant displacement magnitudes. [less ▲]

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See detailMechanical loading highly increases IL-6 production and decreases OPG expression by osteoblasts.
Sanchez, Christelle ULg; Gabay, Odile; Salvat, Colette et al

in Osteoarthritis and Cartilage (2009), 17(4), 473-81

OBJECTIVES: In osteoarthritis (OA), mechanical factors play a key role, not only in cartilage degradation, but also in subchondral bone sclerosis. The aim of this study was to develop on original ... [more ▼]

OBJECTIVES: In osteoarthritis (OA), mechanical factors play a key role, not only in cartilage degradation, but also in subchondral bone sclerosis. The aim of this study was to develop on original compression model for studying the effect of mechanical stress on osteoblasts. MATERIALS AND METHODS: We investigate the effects of compression on primary calvaria osteoblasts isolated from newborn mice and cultured for 28 days in monolayer. At the end of this period, osteoblasts were embedded in a newly synthesized extracellular matrix which formed a three-dimensional membrane. This membrane was then submitted to compression in Biopress Flexercell plates (1-1.7 MPa compressions at 1 Hz frequency) during 1-8h. The expression of 20 genes was investigated by real time reverse transcriptase polymerase chain reaction. Interleukin (IL)-6, matrix metalloproteinase (MMP)-3 and prostaglandin (PG)E(2) were assayed in the culture medium by specific immunoassays. RESULTS: The compression highly increased IL-6 and cyclooxygenase (COX)-2 mRNA levels in osteoblasts. In parallel, increased amount of IL-6 and PGE(2) was found in the supernatant of loaded osteoblasts. This stimulation reached a maximum after 4h of 10% compression. MMP-2, MMP-3, and MMP-13 mRNA levels were also increased by compressive stress, while 15-hydroxyprostaglandin-dehydrogenase and osteoprotegerin (OPG) start to decrease at hour 4. COX-1, microsomial PG E synthase-1 (mPGES1), mPGES2 and cytosolic PGES and receptor activator of nuclear factor ligand (RANKL) were unmodified. Finally, we observed that alpha 5 beta 1 integrin, intracellular Ca(++), nuclear factor-kappaB and extracellular signal-regulated kinase 1/2 pathways were involved in the compression-induced IL-6 and PGE(2) production. IL-6 neutralizing antibodies and piroxicam inhibited the decrease OPG expression, but did not modify RANKL mRNA level, indicating that IL-6 and PGE(2) induce a decrease of the OPG/RANKL ratio. CONCLUSION: This work demonstrates that IL-6 is mechano-sensitive cytokine and probably a key factor in the biomechanical control of bone remodeling in OA. [less ▲]

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See detailMechanical loads on overhead lines bundle conductors
Lamchich, Moulay; El Adnani, Mustapha; Lilien, Jean-Louis ULg

in Proceedings of the 6th ESCC (1994, September)

Power lines subject to short-circuit mechanical loading may include budle collapse and pinch effect.A numerical investigation is performed and test comparisons are detailed.

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See detailMechanical loads on substation apparatuses
Lilien, Jean-Louis ULg; Schon, Ulrich

in Proceedings of the 6th ESCC (1994, September)

Short-circuit mechanical effects in substations are of particular concern. Their dynamic behaviour may sensibly influence the response of the structure to these dynamic loadings.

Detailed reference viewed: 53 (0 ULg)