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See detailEtude du comportement d'un laser continu à colorant
Carapelle, Alain ULg

Master's dissertation (1996)

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See detailEtude du comportement d'une toiture de grandes dimensions soumise à un vent turbulent
Blaise, Nicolas ULg

Master's dissertation (2010)

The aim of this project is the development of a model allowing the calculation of the wind turbulence, using Matlab software. The problems associated wind tunnel pressure measurements (e.g. frequency ... [more ▼]

The aim of this project is the development of a model allowing the calculation of the wind turbulence, using Matlab software. The problems associated wind tunnel pressure measurements (e.g. frequency noise, noise) are taken into account. In order to solve the equation of motion, several methods are applied. First, modal superposition solving decoupled equations by Newmark (NK) and by Fourier transform (FT). Secondly, a stochastic analysis (SRSS and CQC) is performed, using white noise approximation (BB). As an ultimate goal of designing the structure, the calculation of extreme values is realized using a simplified method as well as the statistic method of extreme values. Results show that Newmark method, with fixed time step, produces an elongation of the period and is therefore not recommend. The modal correlation being low, the SRSS analysis is sufficient to determine the dynamic contribution. Results provided by the FT method are closer to the results obtain with CQC-BB method, thus these methods appear to be equivalent. Regarding the calculation of extreme values, the simplified method can calculate positive and negative peak factors, whereas the statistic method of extreme values, applied considering a Gaussian process, can't. In conclusion, the stochastic methods is recommanded because she had the advantage of treating appropriately the noise frequencies for the dynamic contribution. [less ▲]

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See detailÉtude du comportement de Baillonella toxisperma Pierre (moabi) dans les trouées d’abattage enrichies
Kouadio, Y. L.; Doucet, Jean-Louis ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2009), 13(2), 317-324

The moabi (Baillonella toxisperma Pierre) is a commercial tree in central Africa. Although forest gaps are generally considered as favorable to the regeneration of this species, in this study, a ... [more ▼]

The moabi (Baillonella toxisperma Pierre) is a commercial tree in central Africa. Although forest gaps are generally considered as favorable to the regeneration of this species, in this study, a preliminary inventory conducted within a selective exploitation located in the Dja district, southeastern Cameroon, found a low density of 12.7 seedlings.ha-1 within logging gaps. This suggests that the species was in fact poorly represented in logging gaps. In order to further study the behavior of the moabi in logging gaps, 795 seeds were planted in 15 logging gaps and 410 saplings from a tree nursery were introduced in 15 other gaps. A biannual monitoring spanning a period of 30 months showed a 75.9% survival rate for seedlings and 95.5% for saplings. Despite our observation of a significant difference in growth rates between both methods during the first semester, after 30 months of monitoring, seedlings and saplings had reached similar growth rates (167.5 cm and 160.6 cm for seedlings and saplings, respectively). On average, 6.1% of B. toxisperma saplings emerged naturally from the competitive vegetation and had a higher growth rate than other plants species. Growth differences between plants were mainly explained by the geographical orientation of the logging gap (N-S unfavorable) and the density of Macaranga spp. whose abundance inhibits the development of B. toxisperma. In conclusion, both the high survival rate of B. toxisperma in logging gap and its 10 fold higher growth rate in the latter environment when compared to canopy cover suggest the implementation of forestry methods using logging gap during reforesting operations. [less ▲]

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See detailEtude du comportement du film de surfactine à l'interface air-eau
Razafindralambo, Hary ULg; Paquot, Michel ULg; Hbid, Choukri et al

Poster (1993, May 13)

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See detailÉtude du corps-pour-autrui dans l'anorexie mentale
Minguet, Eugénie; Englebert, Jérôme ULg

Poster (2015, October 16)

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See detailÉtude du cytosquelette de microtubules et implication de la vimentine dans le développement postnatal de la cochlée chez les rongeurs
Renauld, Justine ULg

Doctoral thesis (2017)

According to the World Health Organization, nearly 5% of the population suffers from hearing impairments. These can lead to social isolation, depression, or a reduction in professional abilities. There ... [more ▼]

According to the World Health Organization, nearly 5% of the population suffers from hearing impairments. These can lead to social isolation, depression, or a reduction in professional abilities. There are two types of hearing impairments : conductive hearing impairment and sensorineural hearing impairment. The first results from a defect in sound conduction at the level of the outer or middle ear, the latter results from defects in the cochlea or auditory nerve. In recent years, most studies on the organ of hearing have focused on sensory cells, which are actual receptors of auditory information, whereas supporting cells have been little explored. However, the latter, surrounding the sensory cells, contain a highly developed cytoskeleton, essential to the architecture of the mature organ of Corti. During this thesis work, we first observed the setting up of microtubules within the supporting cells of the organ of Corti. Our morphological data revealed important changes in microtubular cytoskeleton of these cells during the first week of life. We identified an arrangement of microtubules into two distinct bundles. We then demonstrated a modification in the morphology of these microtubules, revealing an increase in the diameter and the number of protofilaments of these cells. We finally demonstrated that tubulin βV has a more specific spatiotemporal distribution than the other tubulins. This characteristic suggests that tubulin βV plays an important role in the maturation of the Corti organ. In the second part of this thesis, we analyzed the involvement of vimentin in cochlear development, and more particularly in the opening of the intercellular spaces and in the myelination of the spiral ganglion, which is the first relay of the auditory pathway. In order to study the role of vimentin in the development of the inner ear, we examined the cochlear morphology and auditory capacities of vimentin deficient mice. Our results indicated that the absence of vimentin does not seem to affect the architecture of the organ of Corti. We then showed a slight morphological difference in the nerve fibers between wildtype and vimentin-knockout mice. We finally checked the hearing physiology of these mice and concluded that vimentin does not play a major role in hearing. [less ▲]

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See detailEtude du déferlement des ondes, l'onde régulière et le clapotis
Marchal, Jean ULg; Van Geuns, W.

in Ceres (1977)

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See detailÉtude du degré de satisfaction de patients lombalgiques au sujet du site internet éducatif « Retrain Pain »
Demoulin, Christophe ULg; Blanc, A.; Wolfs, Sébastien ULg et al

in Revue du Rhumatisme (2016, December), 83S

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See detailEtude du développement et de la production de lipopeptides par Bacillus subtilis cultivé sous forme de pellicules à l’interface air-eau.
Gancel, F.; Chollet-Imbert, M.; Slomiany, C. et al

Poster (2007)

Detailed reference viewed: 8 (1 ULg)