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See detailCONTROVERSES SUR LA CONFIGURATION DES TERRITOIRES INDIGÈNES ET DES AIRES PROTÉGÉES
Escobar Jimenez, Kelly ULg

Learning material (2012)

Le document explique quel est le rôle des objets intermédiaires dans la construction de frontières en Amazonie équatorienne. Les dispositifs et instruments mobilisés dans la gestion de ces territoires ... [more ▼]

Le document explique quel est le rôle des objets intermédiaires dans la construction de frontières en Amazonie équatorienne. Les dispositifs et instruments mobilisés dans la gestion de ces territoires stabilisent ou rendent controversé la configuration des limites territoriales. [less ▲]

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See detailControverses thérapeutiques: le traitement de la maladie de Basedow
Khalife, A.; Valdes Socin, Hernan Gonzalo ULg; Beckers, Albert ULg

in Revue Médicale de Liège (1999), 54(7), 606-610

Hyperthyroidism is a common clinical condition with an annual incidence of about 1%. Approximately, 1 in every 20 women will develop this condition during a lifetime. Most cases are due to Graves'disease ... [more ▼]

Hyperthyroidism is a common clinical condition with an annual incidence of about 1%. Approximately, 1 in every 20 women will develop this condition during a lifetime. Most cases are due to Graves'disease. Solitary toxic nodules and toxic multinodular goiters are also important but less frequent causes. In this article, we will consider only the treatment of Graves'disease. Anti-thyroid drugs, surgery and radio-iodine, all represent effective forms of treatment. There is, however, little consensus regarding the treatment of choice for specific cases. This article discusses the advantages and disadvantages of each treatment. [less ▲]

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See detailcontroversies of inter-organizational ambidexterity
Degré, Julie ULg; Antoine, Mélanie ULg

Conference (2009, June)

Generally conceptualized at an intra-organizational level, ambidexterity can also appear at an inter-organizational level when organizations decide to collaborate and distribute activities of exploration ... [more ▼]

Generally conceptualized at an intra-organizational level, ambidexterity can also appear at an inter-organizational level when organizations decide to collaborate and distribute activities of exploration and activities of exploitation according to their specialty. In this paper, we investigate these collaborations, often presented as win-win solutions. On the basis of two case studies of R&D partnerships benefiting from regional subsidies, we show the tensions which cross these alliances and the controversies which divide the partners. Our analysis, based on actor-network theory, indicates that the conditions of a successful inter-organizational ambidexterity do not exist a priori. The success of the partnership rather rests on a continuous translation process creating the convergence between the stakeholders. [less ▲]

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See detailControversy about the cardiovascular safety of sibutramine.
Scheen, André ULg

in Drug Safety : An International Journal of Medical Toxicology & Drug Experience (2010), 33(7), 615-8

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See detailControversy about the relative efficacy of dipeptidyl peptidase IV inhibitors.
SCHEEN, André ULg

in Diabetologia (2012), 55

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See detailThe conundrum of inducible nitric oxide synthase in chronic leg ulcers.
Quatresooz, Pascale ULg; Paquet, Philippe ULg; Pierard, Gérald ULg

in Exogenous Dermatology : Physical, Chemical, Biological (2004), 3

Nitric oxide (NO) is a potent biological mediator that can be produced in wounds by activation of inducible nitric oxide synthase (iNOS). Its presence appears to be beneficial to the healing process by ... [more ▼]

Nitric oxide (NO) is a potent biological mediator that can be produced in wounds by activation of inducible nitric oxide synthase (iNOS). Its presence appears to be beneficial to the healing process by promoting vasodilation and boosting both migration and synthetic activity of fibroblasts. Chronic leg ulcers differ from acute experimental wounds because the connective tissue and microvascularization of the ulcer bed are strikingly remodelled in chronic wounds. In addition, a bacterial critical colonization from the environment is also often present and deleterious. As such, NO release in leg ulcers may prove to be beneficial by improving the microvasculature and fibroblast functions, and by its antimicrobial effect. However, any excess in NO could become cytotoxic for keratinocytes, thus impeding re-epithelialization. Furthermore, chronic NO release could be involved in the cancerogenesis process leading to Marjolin ulcer. In conclusion, NO induced by environment factors mediates contrasted effects in wound healing that may be beneficial or detrimental for the patient. [less ▲]

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See detailThe conundrum of skin pores in dermocosmetology.
Uhoda, Emmanuelle ULg; Pierard, Claudine ULg; Petit, Ludivine et al

in Dermatology : International Journal for Clinical & Investigative Dermatology (2005), 210(1), 3-7

'Skin pore' is a term used by lay people and in the field of cosmetology. It remains misleading when it is not clearly defined. Indeed, lay people use it with at least 3 different meanings. Basically ... [more ▼]

'Skin pore' is a term used by lay people and in the field of cosmetology. It remains misleading when it is not clearly defined. Indeed, lay people use it with at least 3 different meanings. Basically, invisible pores represent the openings of the sweat gland apparatus. By contrast, the visible pores represent enlarged empty funnel-shaped or cylindrical horny impacted openings of pilosebaceous follicles. This review describes some of the current objective methods used to describe skin pores. [less ▲]

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See detailThe conundrum of the electromagnetic semicircular lipoatrophy
QUATRESOOZ, Pascale ULg; PIERARD, Gérald ULg

in Kosmetische Medizin (2006)

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See detailConvection and interfacial mass exchange
Colinet, P.; Legros, Jean-Claude; Dauby, Pierre ULg et al

in ESA Special Publication (2005, October 01)

Mass-exchange through fluid interfaces is ubiquitous in many natural and industrial processes. Yet even basic phase-change processes such as evaporation of a pure liquid are not fully understood, in ... [more ▼]

Mass-exchange through fluid interfaces is ubiquitous in many natural and industrial processes. Yet even basic phase-change processes such as evaporation of a pure liquid are not fully understood, in particular when coupled with fluid motions in the vicinity of the phase-change interface, or with microscopic physical phenomena in the vicinity of a triple line (where the interface meets a solid). Nowadays, many industries recognise that this lack of fundamental knowledge is hindering the optimisation of existing processes. Their modelling tools are too dependent on empirical correlations with a limited - and often unknown - range of applicability. In addition to the intrinsic multiscale nature of the phenomena involved in typical industrial processes linked to interfacial mass exchange, their study is highly multi-disciplinary, involving tools and techniques belonging to physical chemistry, chemical engineering, fluid dynamics, non-linear physics, non-equilibrium thermodynamics, chemistry and statistical physics. From the experimental point of view, microgravity offers a unique environment to obtain valuable data on phase-change processes, greatly reducing the influence of body forces and allowing the detailed and accurate study of interfacial dynamics. In turn, such improved understanding leads to optimisation of industrial processes and devices involving phase-change, both for space and ground applications. [less ▲]

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See detailConvection de Bénard-Marangoni en régime oscillant
Dondlinger, Mireille; Dauby, Pierre ULg

in Proceedings du 16ème Congrès français de mécanique, Nice, 1-5 septembre 2003 (2003)

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See detailConvection-Oscillations Interaction in F-G Type Main Sequence Stars
Dupret, Marc-Antoine ULg; Grigahcène, A.; Garrido, R. et al

in SOHO 14 Helio- and Asteroseismology: Towards a Golden Future (2004, October 01)

Not Available

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See detailConvection-pulsation coupling. I. A mixing-length perturbative theory
Grigahcène, A.; Dupret, Marc-Antoine ULg; Gabriel, Maurice ULg et al

in Astronomy and Astrophysics (2005), 434

We present in details a time-dependent convection treatment in the frame of the Mixing-Length Theory (MLT). Following the original ideas by Unno (1967, PASJ, 19, 140), this theory has been developed by ... [more ▼]

We present in details a time-dependent convection treatment in the frame of the Mixing-Length Theory (MLT). Following the original ideas by Unno (1967, PASJ, 19, 140), this theory has been developed by Gabriel et al. (1974, Bull. Ac. Roy. Belgique, Classe des Sciences, 60, 866) and Gabriel (1996, Bull. Astron. Soc. India, 24, 233). In this paper, we present it in a united form, we detail the basic derivations and approximations and give final improvements. A new perturbation of the energy closure equation is proposed for the first time, making it possible to avoid the occurrence of short wavelength spatial oscillations of the thermal eigenfunctions. This theory accounts for the perturbation of the convective flux, the turbulent Reynolds stress and the turbulent kinetic energy dissipation. It has been numerically implemented in a non-radial non-adiabatic pulsation code and the first results published in a Letter by Dupret et al. (2004a, A&A, 414, L17) indicate that the theory predicts the observed red border of the lower end of the instability strip and the driving mechanism of the recently discovered gamma Dor stars. [less ▲]

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See detailConvection-pulsation coupling. II. Excitation and stabilization mechanisms in delta Sct and gamma Dor stars
Dupret, Marc-Antoine ULg; Grigahcène, A.; Garrido, R. et al

in Astronomy and Astrophysics (2005), 435

We apply here the Time Dependent Convection (TDC) treatment presented in our earlier paper in this series to the study of delta Sct and gamma Dor pulsating stars. Stabilization of the delta Sct p-modes at ... [more ▼]

We apply here the Time Dependent Convection (TDC) treatment presented in our earlier paper in this series to the study of delta Sct and gamma Dor pulsating stars. Stabilization of the delta Sct p-modes at the red edge of the Instability Strip (IS) and the driving of the gamma Dor g-modes are explained by our models. Theoretical IS obtained with different values of the Mixing Length (ML) parameter alpha are compared to observations and a good agreement is obtained for alpha between 1.8 and 2. The influence of each term of our TDC treatment (perturbation of convective flux, turbulent pressure, and turbulent kinetic energy dissipation) on the eigenfrequencies and on the driving and damping mechanisms is investigated. Finally, we show that our TDC models predict the likely existence of hybrid stars with both delta Sct p-modes and gamma Dor g-modes oscillations. [less ▲]

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See detailConvection-pulsation interaction: theories and applications
Dupret, Marc-Antoine ULg; Grigahcene, A.; Gabriel, Maurice ULg et al

in Communications in Asteroseismology (2006), 147

The problem of the interaction between convection and pulsations is considered. A precise modeling of this interaction is required for the seismic study of stars with non-negligible convective envelope ... [more ▼]

The problem of the interaction between convection and pulsations is considered. A precise modeling of this interaction is required for the seismic study of stars with non-negligible convective envelope. After a short introduction to the Time-Dependent Convection theory of Gabriel (1996) and Grigahcene et al. (2005), we give a summary of the main results obtained with this treatment for delta Sct, gamma Dor and solar-like stars. [less ▲]

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See detailConvective drying behavior of sawdust/sludge mixtures in a fixed bed
Li, Jie ULg; Fraikin, Laurent ULg; Salmon, Thierry ULg et al

Scientific conference (2014, May 27)

This work is part of a project aiming at developing a renewable fuel for gasification purposes, through the convective drying of sludge/wood mixtures. The first step consists in characterizing the drying ... [more ▼]

This work is part of a project aiming at developing a renewable fuel for gasification purposes, through the convective drying of sludge/wood mixtures. The first step consists in characterizing the drying behaviour of sludge/sawdust mixtures, in a convective fixed bed dryer. The influence of the mixing step (no mixing against 30 s at 40 rpm) and the sawdust/sludge ratio (1/9, 2/8, 3/7 and 4/6 on a dry basis) was investigated. X-ray tomography, a non-invasive imaging technique, was used to assess changes in volume and exchange surface during drying. The sawdust addition was shown to have a positive impact on the drying process from mass ratio of 2/8. Results showed that the volume and exchange surface increased with higher sawdust addition during the whole drying process. Moreover, a linear decrease of the exchange surface is observed with sludge, while a plateau is reached after a linear phase for sludge/sawdust mixtures. As expected, the drying rate of sludges or sludge/sawdust mixtures decreased nearly linearly with the exchange surface. For sawdust/sludge mixtures, the drying rate continued to decrease after the end of shrinkage, due to internal transfer limitations. These promising results open the way to new valorisation ways, especially for very pasty sludge. [less ▲]

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See detailConvective drying of gels: comparison between simulated and experimental moisture profiles obtained by X-ray microtomography
Escalona, Ivonne; Jomaa, Wahbi; Olivera-Fuentes, C. et al

in Drying Technology (2010), 28(5), 644-650

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See detailConvective drying of gels: comparison between simulated and experimental moisture profiles obtained by X-ray microtomography
Escalona, Ivonne; Jomaa, Wahbi; Olivera-Fuentes, Claudio et al

in Thorat, B. N. (Ed.) Drying 2008 - Proceedings of the 16th International Drying Symposium (IDS2008), Vol. C. (2008, November)

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See detailConvective Drying of Mixtures of Sewage Sludge and Sawdust in a Fixed Bed
Li, Jie ULg; Fraikin, Laurent ULg; Salmon, Thierry ULg et al

Conference (2013, October 04)

This work is part of a project aiming at developing a renewable fuel for gasification purposes, through the convective drying of sludge/wood mixtures. The first step consists in characterizing the drying ... [more ▼]

This work is part of a project aiming at developing a renewable fuel for gasification purposes, through the convective drying of sludge/wood mixtures. The first step consists in characterizing the drying behaviour of sludge/sawdust mixtures, in a convective fixed bed dryer. In particular, the influence of the mixing step (no mixing against 30 s at 40 rpm) and the sawdust/sludge ratio (1/9, 2/8, 3/7 and 4/6 on a dry basis) have been investigated, as well as the drying temperature (50 °C, 80 °C and 110 °C). As showed in a previous work, the addition of dry matter into sludge has an impact on the initial 3D structure of the bed of extrudates to be dried. Moreover, it is well known that the volume shrinkage occurring during sludge drying will affect the drying velocity. In this study, X-ray tomography, a non-invasive imaging technique, is used to assess changes in volume, porosity and exchange surface between the beginning and the end of the drying process. Results first confirm the importance of the mixing step on the drying behaviour: the drying rate of the mixed sludge is slower than the one of original sludge. Nevertheless the addition of sawdust is shown to have a positive impact on the drying process from mass ratio of 2/8, with observed drying rates higher than for the original sludge. During the whole drying process, the volume and exchange surface of the sample increase and the porosity decreases as the mass ratio increases. These results indicate that the air and the sample contact more fully with more sawdust addition, resulting from bed expansion and exchange surface increase. Hence, the heat and mass transfer efficiency between the air and the material increases and consequently the drying rate. Further work will be done in order to assess the impact of the drying temperature and to characterize the behaviour of these samples during pyrolysis using thermo gravimetric analysis. [less ▲]

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See detailConvective drying of sawdust/sludge mixtures in a fixed bed: The effect of sludge origin
Li, Jie ULg; Fraikin, Laurent ULg; Salmon, Thierry ULg et al

Scientific conference (2014, August 26)

Sludges collected from Oupeye WWTP (MS=80%), Grosses Battes WWTP (MS=85.5%), and Embourg WWTP (MS=88%) in Belgium and presenting different properties were used. The influence of the sawdust/sludge ratio ... [more ▼]

Sludges collected from Oupeye WWTP (MS=80%), Grosses Battes WWTP (MS=85.5%), and Embourg WWTP (MS=88%) in Belgium and presenting different properties were used. The influence of the sawdust/sludge ratio on convective drying was investigated in a fixed bed. X-ray tomography was used to assess changes in volume, exchange surface and void fraction. Results showed that the average drying rates were 0.062 (Oupeye), 0.079 g/s (Grosses Battes) and 0.042 g/s (Embourg) respectively, using raw sludges. For sawdust/sludge mixtures with the mass ratio of 4/6, the average drying rates of sludges were improved (Oupeye: 0.092 g/s, Grosses Battes: 0.106 g/s, Embourg: 0.049 g/s). [less ▲]

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See detailConvective drying of wastewater sludge: Introduction of shrinkage effect in mathematical modeling
Bennamoun, Lyes ULg; Crine, Michel ULg; Léonard, Angélique ULg

in Drying Technology (2013), 31(6), 643-654

Drying of two kinds of wastewater sludge was studied. The first part was an experimental work done in a discontinuous cross-flow convective dryer using 1 kg of wet material extruded in 12-mm-diameter ... [more ▼]

Drying of two kinds of wastewater sludge was studied. The first part was an experimental work done in a discontinuous cross-flow convective dryer using 1 kg of wet material extruded in 12-mm-diameter cylinders. The results show the influence of drying air temperature for both sludges. The second part consisted of developing a drying model in order to identify the internal diffusion coefficient and the convective mass transfer coefficient from the experimental data. A comparison between fitted drying curves, well represented by Newton's model, and the analytical solutions of the equation of diffusion, applied to a finite cylinder, was made. Variations in the physical parameters, such as the mass, density, and volume of the dried product, were calculated. This allowed us to confirm that shrinkage, which is an important parameter during wastewater sludge drying, must be taken into account. The results showed that both the internal diffusion coefficient and convective mass transfer coefficient were affected by the air temperature and the origin of the sludge. The values of the diffusion coefficient changed from 42.35 × 10−9 m2 · s−1 at 160°C to 32.49 × 10−9 m2 · s−1 at 122°C for sludge A and from 33.40 × 10−9 m2 · s−1 at 140°C to 28.45 × 10−9 m2 · s−1 at 120°C for sludge B. The convective mass transfer coefficient changed from 4.52 × 10−7 m · s−1 at 158°C to 3.33 × 10−7 m · s−1 at 122°C for sludge A and from 3.44 × 10−7 m · s−1 at 140°C to 2.84 × 10−7 m2 · s−1 at 120°C for sludge B. The temperature dependency of the two coefficients was expressed using an Arrhenius-type equation and related parameters were deduced. Finally, the study showed that neglecting shrinkage phenomena resulted in an overestimation that can attain and exceed 30% for the two coefficients. [less ▲]

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