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See detailL'axe rénine-angiotensine-aldostérone : Le syndrome de Conn
Beckers, Albert ULg

Scientific conference (2005, January 14)

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See detailL'axe rénine-angiotensine-aldostérone : le syndrome de Conn
Beckers, Albert ULg

Scientific conference (2006, December 15)

Detailed reference viewed: 22 (1 ULg)
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See detailAxes rotation during simple shear test: Measurement and predictions
Lelotte, Thomas; Gerday, Anne-Françoise ULg; Flores, Paulo et al

in Oñate, E.; Owen, D. R. J. (Eds.) Proceedings of the VIII International Conference on Computational Plasticity (COMPLAS VIII) (2005)

For a simple shear test, the finite element (FE) local frame, that stays orthogonal, does not follow the anisotropic material frame. To study this effect, FE simulations have been compared with ... [more ▼]

For a simple shear test, the finite element (FE) local frame, that stays orthogonal, does not follow the anisotropic material frame. To study this effect, FE simulations have been compared with experimental results (optical and texture measurements) and it was shown that it is necessary to take into account the effect of texture updating for local axes rotation. [less ▲]

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See detailAxial dispersion in trickle-flow reactors
Crine, Michel ULg; L'Homme, Guy ULg

in Enclyclopedia of Fluid Mechanisms (1986)

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See detailAxial dispersion processes in liquid trickle flow through packed bed
Crine, Michel ULg; Asua, J. M.; L'Homme, Guy ULg

in Chemical Engineering Journal (1982), 25

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See detailAXIAL IMPELLER SELECTION FOR ANCHORAGE DEPENDENT ANIMAL CELL CULTURE IN STIRRED BIOREACTORS: METHODOLOGY BASED ON THE IMPELLER COMPARISON AT JUST-SUSPENDED SPEED OF ROTATION
Collignon, Marie-Laure ULg; Delafosse, Angélique ULg; Crine, Michel ULg et al

in Chemical Engineering Science (2010), 65(22), 5929-5941

Animal cells, which are nowadays essential for the industrial production of proteinic compounds, are commonly cultivated inside stirred tank bioreactors. In case of anchorage dependent cells, they are ... [more ▼]

Animal cells, which are nowadays essential for the industrial production of proteinic compounds, are commonly cultivated inside stirred tank bioreactors. In case of anchorage dependent cells, they are usually fixed on microcarriers. The choice of agitation conditions (impeller type, rotational speed…) in this type of process is not an easy task as it has to fulfil three potentially conflicting goals: (1) maintaining microcarriers in complete suspension, (2) homogenizing the culture medium, and (3) limiting mechanical constraints generated by the hydrodynamics on the cells. The aim of this study is to present an original methodology to select the most appropriate axial impeller for this specific application. Seven propellers are preselected on basis of their characteristics available in the literature. Instead of comparing impellers at a given rotational speed or a given power input, they are compared at their respective minimum impeller rotational speed that leads to a complete microcarrier suspension, i.e. at their respective just-suspended speed Njs. They are then compared at higher rotational speeds N, expressed as multiples of Njs. The impeller classification is based on the intensity of mechanical constraints they produced, evaluated from: (1) the macro-shear rate quantified by the spatial derivative of time average velocity fields measured by P.I.V, (2) the micro-shear rate characterized by the ratio between the microcarrier diameter to the average Kolmogorov scale computed from power input measurements, and (3) the impact of microcarrier collisions on cells described via the Turbulent Collision Severity index also computed from power input measurements. Results show that the 125 mm diameter TTP impeller (Mixel) and the 150 mm diameter Elephant Ear impeller (Applikon) produce the smallest mechanical constraints at their just-suspended speed (50 rpm and 20 rpm, respectively). Moreover, the mechanical constraints they produce increase more slowly with the N/Njs ratio than the mechanical constraints produced by other impellers. These propellers are thus even more advantageous if rotational speeds higher than the just-suspended speed have to be used. [less ▲]

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See detailAn axial periodic fibrillar arrangement of antigenic determinants for fibronectin and procollagen on ascorbate treated human fibroblasts.
Furcht, L. T.; Wendelschafer-Crabb, G.; Mosher, D. F. et al

in Journal of Supramolecular Structure (1980), 13(1), 15-33

Fibronectin and collagens are major constituents of the cell matrix of fibroblasts. Fibronectin is a 220,000 dalton glycoprotein that mediates a variety of adhesive functions of cells examined in vitro ... [more ▼]

Fibronectin and collagens are major constituents of the cell matrix of fibroblasts. Fibronectin is a 220,000 dalton glycoprotein that mediates a variety of adhesive functions of cells examined in vitro. Fibronectin is secreted in a soluble form and interacts with collagen to form extracellular filaments. Fibronectin and procollagen type I were localized using the peroxidase anti-peroxidase method. Under standard culture conditions, fibronectin and procollagen were localized to non-periodic 10 nm extracellular fibrils, the cell membrane and plasma membrane vesicles. Ascorbate treatment of cells leads to a new larger fibril with a diameter of approximately 40 nm. Antibodies to fibronectin and procollagen I react to these native collagen fibrils with an axial periodicity of approximately 70 nm. Fibronectin is clearly associated with native collagen fibrils produced by ascorbate treated cells and there is an asymetric distribution or segregation of fibronectin on these collagen fibrils with a 70 nm axial repeat. [less ▲]

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See detailAxially Loaded Stainless Steel Columns in Case of Fire
Lopes, Nuno; Vila Real, Paulo; Simões da Silva, Luís et al

in Journal of Structural Fire Engineering [=JSFE] (2010), 1(1), 43-59

The simple model of Eurocode 3, for the fire resistance evaluation of stainless steel members, are based on the procedures used for carbon steel structural elements. However, due to the existing ... [more ▼]

The simple model of Eurocode 3, for the fire resistance evaluation of stainless steel members, are based on the procedures used for carbon steel structural elements. However, due to the existing differences in the constitutive laws of these two materials, it is expected that it would not be possible to use, in both materials, the same formulae for the member stability calculation, as proposed in Eurocode 3. This paper aims at increasing the knowledge on the behaviour of stainless steel axially loaded columns at elevated temperatures. For this purpose, a geometrical and material non linear computer code has been used to determine the buckling load of these elements. The Eurocode formulae are evaluated and a new proposal, that ensures accurate and conservative results when compared with the numerical simulations, is presented. [less ▲]

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See detailAxillary artery injury secondary to anterior shoulder dislocation: report of two cases.
MAWEJA, Sylvie ULg; SAKALIHASAN, Natzi ULg; VAN DAMME, Hendrik ULg et al

in Acta Chirurgica Belgica (2002), 102(3), 187-91

Vascular injuries secondary to isolated shoulder dislocation are rare. Unawareness for closed axillary artery trauma by many physicians treating shoulder dislocations, counts often for missed or delayed ... [more ▼]

Vascular injuries secondary to isolated shoulder dislocation are rare. Unawareness for closed axillary artery trauma by many physicians treating shoulder dislocations, counts often for missed or delayed diagnosis. The authors describe two cases that presented with an anterior shoulder dislocation, complicated by a disruption of the axillary artery with subsequent thrombosis. The various pathogenic mechanisms are discussed. The pathognomic triad consists of anterior shoulder dislocation, absent or diminished distal pulse and an axillary protruding hematoma. Prompt surgical arterial repair is mandatory. [less ▲]

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See detailAxillary proliferation and tuberisation of Dioscorea cayenensis-D-rotundata complex
Ovono, Paul O; Kevers, Claire ULg; Dommes, Jacques ULg

in Plant Cell, Tissue & Organ Culture (2007), 91(2), 107-114

Yams (Dioscorea spp) are tuber crops used as staple food in Africa because of their nutritional value. However agronomic constraints, phytosanitary problems and the lack of good healthy planting material ... [more ▼]

Yams (Dioscorea spp) are tuber crops used as staple food in Africa because of their nutritional value. However agronomic constraints, phytosanitary problems and the lack of good healthy planting material restrict their production. In contrast to the inefficiency of traditional method of planting, tissue culture techniques allow to increase the multiplication and the rapid production of pathogen- free plant material. This work was undertaken to provide farmers in African countries with healthy microplants and microtubers as seeds. In vitro nodal segments of two varieties of local yams D. cayenensis-D. rotundata complex (cv.'Singo', cv. 'Singou' and cv. 'Gnidou') were micropropagated on the modified medium of Murashige and Skoog. The morphogenesis, the growth of microplants and microtuber formation have been found to be controlled by external factors that act individually and synergistically. Addition of kinetin (2 mg l(-1)) to the culture media could reduce multiplication rate (node number) of some clones. An increase of the sucrose concentration from 3% to 5% induced no change in the multiplication and tuberisation parameters. An important reduction of the multiplication (shoot number, height and node number) and the tuberisation (tuber number and length) was observed with 8% sucrose. Multiplication (shoot and node number) was increased in the presence of jasmonic acid (10 mu M). JA also induced an increase of tuber number in the absence of Kin. Multiplication of yam by in vitro growth of nodal segments is a way for rapid clonal multiplication and could allow solving the problem of lack of seed material faced by farmers. This method could also be used for multiplication of elite cultivars, independently of the growing season. [less ▲]

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See detailAxillounifemoral and Axillobifemoral Bypasses. Retrospective Study of 85 Cases
DUJARDIN, P.; LAVIGNE, Jean-Paul ULg; Defraigne, Jean-Olivier ULg et al

in Acta Chirurgica Belgica (1991), 91(4), 155-60

From 1983 to 1990, 65 axillobifemoral and 20 axillofemoral bypasses have been performed in 85 patients (77 men and 8 women), with a mean age of 69 +/- 9 years. Indications for surgery were: severe ... [more ▼]

From 1983 to 1990, 65 axillobifemoral and 20 axillofemoral bypasses have been performed in 85 patients (77 men and 8 women), with a mean age of 69 +/- 9 years. Indications for surgery were: severe aortoiliac occlusive disease (87%), sepsis of previous aortoiliac prosthesis, abdominal aorta aneurysm. Anatomic bypass was precluded for general (81%) or local (19%) conditions. In the last group, 9 patients have had previous laparotomy. Four patients presented with aortoenteric fistulas. Eighteen patients were operated on in emergency. The operative mortality was 12%, with 50% cardiac related deaths. Early primary patency was 98%. Early secondary patency was 100%. The mean follow-up is 28 +/- 15 months. The 3 years survival is 77%. The cumulative patency rates at 1 and 3 years are 89% and 76% respectively. Although axillobifemoral bypasses achieve poor long-term results when compared with aortoiliac bypasses, they can be considered in high risk patients. In this group of patients, the cumulative patency rate and the survival curves tend to be parallel. [less ▲]

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See detailAxion-like particles and circular polarisation of active galactic nuclei
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

in Jaeckel, Joerg; Lindner, Axel; Redondo, Javier (Eds.) Proceedings of the 5th Patras Workshop on Axions, WIMPs and WISPs PATRAS 2009 (2010)

The measurements of the linear polarisation of visible light from quasars give strong evidence for large-scale coherent orientations of their polarisation vectors in some regions of the sky. We show that ... [more ▼]

The measurements of the linear polarisation of visible light from quasars give strong evidence for large-scale coherent orientations of their polarisation vectors in some regions of the sky. We show that these observations can be explained by the mixing of the photons with very light pseudoscalar (axion-like) particles in extragalactic magnetic fields during their propagation. We present a new treatment in terms of wave packets and discuss the circular polarisation. [less ▲]

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See detailAxions & Polarisation of Quasars
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

Poster (2008, May 21)

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See detailAxions and polarisation of quasars
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

in AIP Conference Proceedings (2008), 1038

We present results showing that, thanks to axion-photon mixing in external magnetic fields, it is actually possible to produce an effect similar to the one needed to explain the large-scale coherent ... [more ▼]

We present results showing that, thanks to axion-photon mixing in external magnetic fields, it is actually possible to produce an effect similar to the one needed to explain the large-scale coherent orientations of quasar polarisation vectors in visible light that have been observed in some regions of the sky. [less ▲]

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See detailAxions et polarisation des quasars
Payez, Alexandre ULg

in Barillon, Pierre (Ed.) Journées Jeunes Chercheurs 2008 (2010)

[Français] Je présente rapidement l'objet de mes recherches et tente ensuite l'exercice consistant à exposer - le plus clairement possible - les idées et considérations physiques ayant amené à la ... [more ▼]

[Français] Je présente rapidement l'objet de mes recherches et tente ensuite l'exercice consistant à exposer - le plus clairement possible - les idées et considérations physiques ayant amené à la proposition de l'existence de l'axion. [less ▲]

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See detailAxions et polarisation des quasars
Payez, Alexandre ULg

Master's dissertation (2007)

Suite à l’observation de la polarisation de la lumière provenant de quasars, une tendance à l’alignement des vecteurs de polarisation de ces lointains objets fut détectée dans certaines régions du ciel ... [more ▼]

Suite à l’observation de la polarisation de la lumière provenant de quasars, une tendance à l’alignement des vecteurs de polarisation de ces lointains objets fut détectée dans certaines régions du ciel, celle-ci restant inexplicable par des effets locaux et semblant mettre en évidence l’existence de corrélations à très grande échelle, sur des distances cosmologiques. L’objet de ce travail, qui s’inscrit à l’interface entre la physique des particules et l’astrophysique, sera de se pencher sur ce problème et de déterminer dans quelle mesure l’existence d’un certain type de particules encore hypothétiques, nommées axions, pourrait permettre de rendre compte de ce phénomène ; les propriétés prédites pour celles-ci incluant un couplage (faible, mais les distances entrant en jeu étant très grandes, les effets de ce couplage pourraient malgré tout être observables) avec la lumière. [less ▲]

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See detailAxisymmetric transient modelling of a suction caisson in dense sand
Cerfontaine, Benjamin ULg; Levasseur, Séverine ULg; Collin, Frédéric ULg et al

in Hicks, Michael A.; Brinkgreve, Ronald, B.J.; Rohe, Alexander (Eds.) Numerical Methods in Geotechnical Engineering (2014)

Suction caisson are hollow cylinders open towards the bottom that are currently used as anchors for deep water offshore facilities. They recently turned out to be advantageously exploited as foundation ... [more ▼]

Suction caisson are hollow cylinders open towards the bottom that are currently used as anchors for deep water offshore facilities. They recently turned out to be advantageously exploited as foundation for offshore wind turbines in shallow water (Senders 2009). The Prevost model for cohesionless soils (Prevost 1985) is currently used for the modelling of their cyclic behaviour. It’s able to reproduce plastic deformation in both loading and unloading, contractancy of the soil and pore pressure build up as well. In this paper, a fully- coupled transient axisymmetric analysis of a suction caisson is carried out. A vertical pseudo-random loading is transformed into equivalent ones. Comparison of the permanent displacement accumulated shows a good agreement between them. The influence of the interface conditions is also addressed. For low tension amplitude applied to the caisson, it can be modelled as “stuck” to the inner soil. However higher amplitude might lead to a total unplugging. [less ▲]

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See detailAxisymmetric transient modelling of a wind turbine foundation in cohesionless soil using the Prevost’s model
Cerfontaine, Benjamin ULg; Levasseur, Séverine ULg; Charlier, Robert ULg

in Computational Methods in Marine Engineering (2013)

Suction caissons are more and more used for offshore foundations. This paper deals with the cyclic modelling of suction caissons using the Prevost's model. The case study is a 8m large diameter embedded ... [more ▼]

Suction caissons are more and more used for offshore foundations. This paper deals with the cyclic modelling of suction caissons using the Prevost's model. The case study is a 8m large diameter embedded in dense No. 0 Lund sand. Parameters for the model are calibrated using drained triaxial tests. A parametric study concerning the influence of the constitutive law, the skirt length and permeability is carried out. [less ▲]

Detailed reference viewed: 44 (19 ULg)