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See detailEtude historique et archéologique du château de Franchimont à Theux
Hoffsummer, Patrick ULg

Master's dissertation (1980)

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See detailEtude ab-initio d’oxydes antiferroélectriques de structure pérovskite
Amisi, Safari ULg

Doctoral thesis (2013)

In this thesis we present an original ab-initio study of the evolution of antiferrodistortive (AFD), anti-polar electric (APE), and ferroelectric (FE) instabilities in various ABO3 oxides of perovskite ... [more ▼]

In this thesis we present an original ab-initio study of the evolution of antiferrodistortive (AFD), anti-polar electric (APE), and ferroelectric (FE) instabilities in various ABO3 oxides of perovskite structure, as well as their structural and dynamic properties. The main goal is to understand better the microscopic origin of the antiferroelectricity exhibited in these compounds. Three prototypical compounds are studied in detail : PbZrO3 , NaNbO3 , and SrZrO3. After a general introduction on ABO3 compounds, and the ab-initio techniques, we review the concept of antiferroelectricity in perovskites, highlighting some ambiguities in the usual definition and the necessity of turning to what we call a modern definition of antiferroelectricity. First, we highlight that it is the rigidity of the oxygen cage that tends to favor the FE distortion compared to the APE instability. Although illustrated on BaTiO3 , this argument is general, and confirmed by the inspection of the phonons dispersion curves of the ABO3 compounds in whom the strongest instability of the FE/APE branch is systematically at Γ. We show that the emergence of a stable or meta-stable APE distortion appear naturally through a coupling with other instabilities. The presence of AFD modes turns out to be a concrete way to create mixed FE/AFD and APE/AFD phases, crucial for the emergence of antiferroelectricity (AFE). This clarifies why the known AFE compounds systematically include AFD distortions. In this context, since the FE, APE and AFD instabilities are usually in competition, the coexistence of FE, APE and AFD instabilities of strong amplitudes seems required to create mixed phases combining them. This establishes the context convenient to the development of FE and AFE metastable phases close in energy. Another important element concerns the need of a first order AFE-FE transition under electric field producing a double hysteresis loop, typical of AFE compounds. Here also the AFD modes could play a key-role by allowing the emergence of FE/AFD and APE/AFD phases close in energy and developing distinct tilt patterns. These various elements give a new perspective on AFE and allow us to have a more precise idea of the origin of the AFE behavior in perovskites. We identify some key intrinsic characteristics allowing the prediction of materials with the propensity of developing an AFE behavior. [less ▲]

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See detailL’étude ACCOMPLISH : remise en question des choix médicamenteux chez les patients hypertendus systoliques à haut risque cardio-vasculaire
Krzesinski, Jean-Marie ULg; Scheen, André ULg

in Revue Médicale de Liège (2009), 64(2), 103-108

Arterial hypertension is an important cardiovascular risk factor. The benefit drawn from decreasing and normalizing the blood pressure level is indisputable. The ACCOMPLISH study performed in patients ... [more ▼]

Arterial hypertension is an important cardiovascular risk factor. The benefit drawn from decreasing and normalizing the blood pressure level is indisputable. The ACCOMPLISH study performed in patients older than 65 with systolic hypertension and a high cardiovascular risk pointed out the interest of well choosing the antihypertensive combination to reduce this risk beyond the decrease of blood pressure. The association of benazepril (an angiotensin converting enzyme inhibitor or ACEI) and amlodipine (a calcium antagonist) has shown significant early cardiovascular protection in such patients as compared to the classic association including the same ACEI and hydrochlorothiazide, in spite of the same target blood pressure reached. This important finding does not contest the interest of a well controlled blood pressure in hypertension, but probably will modify our first antihypertensive combination choice in the future in patients with such cardiovascular profile. [less ▲]

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See detailEtude ALLHAT : intérêt
Krzesinski, Jean-Marie ULg

Conference (2003, February 13)

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See detailÉtude analytique de l'agriculture familiale au Burundi : impact des conflits fonciers sur le développement socio-économique des exploitants agricoles de la province de Kirundo
Minani, Bonaventure ULg; Rurema, Déo-Guide; Lebailly, Philippe ULg

in Reyntjens, F.; Vandeginste, S.; Verpoorten, M. (Eds.) L'Afrique des Grands Lacs : Annuaire 2012-2013 (2013)

In Burundi, family farming occupies more than 90% of the active population and plays a vital role in food production and participates in the formation of more than 50% of GDP. Before the civil war of 1993 ... [more ▼]

In Burundi, family farming occupies more than 90% of the active population and plays a vital role in food production and participates in the formation of more than 50% of GDP. Before the civil war of 1993, Kirundo was deemed “breadbasket of the country” because it fed many parts of Burundi in particular food legumes and cereals, so that family farming was market-oriented. Today, this is the first province in Burundi that shows a high rate of malnutrition, poverty increased and a sharp decline in agricultural production up more than 56.6% from 1996 to 2009. The objective of this study is to understand the impact of land conflict on the socio-economic development of farmers in Kirundo Province. To conduct this study, an initial survey was carried out in 2010 among 355 randomly selected farmers in all communes of Kirundo. To understand the scope of land conflicts and its consequences on the socio-economic households, a second survey was conducted among 30 people who came to the High Court of Kirundo. The study was completed by collecting data on the courts of the residential suburbs of Bugabira, Busoni, Gitobe, Kirundo, Ntega and Vumbi communes, and also on the High Court of Kirundo province. Analysis of the results shows that land conflicts in the region have the following consequences: huge losses of agricultural production, substantial legal costs and the imprisonment and killing of people because of land conflicts. [less ▲]

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See detailEtude analytique de la flore et de la végétation du Parc National de la Ruvubu, Burundi.
Masharabu, T; Bigendako, M J; Lejoly, J. et al

in International Journal of Biological and Chemical Sciences (2010), 4(4), 834-856

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See detailEtude analytique des trois trousses de cystatine C et impact sur les formules basées sur la cystatine pour l'estimation du DFG.
Cavalier, Etienne ULg; Péroni, Laurence; Abshoff, Christelle et al

in Néphrologie & Thérapeutique (2008, November), 4(6), 399-400

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See detailÉtude anatomoradiologique d’un crâne déformé d’Ancón (Pérou)
Ricciardetto, Antonio ULg; Boman, Françoise; Duchat, Florent et al

in Charlier, Philippe (Ed.) Actes du Ve Colloque international de Pathographie (in press)

Matériels et méthodes : l’étude porte sur un crâne déformé provenant d’Ancón au Pérou, inventorié au Muséum National d’Histoire Naturelle (MNHN) de Paris en 1889. L’étude est géographique, historique ... [more ▼]

Matériels et méthodes : l’étude porte sur un crâne déformé provenant d’Ancón au Pérou, inventorié au Muséum National d’Histoire Naturelle (MNHN) de Paris en 1889. L’étude est géographique, historique, macroscopique et tomodensitométrique. Résultats : situé sur la côte à 40 km au nord de Lima, la capitale du Pérou, le site d’Ancón est un site archéologique de la période lithique, et un lieu de sépulture depuis l’époque Chavín (1250 à 250 av. J.-Chr.). Dès l’époque Chavín, les peuples du Pérou ancien construisaient des centres cérémoniels dirigés par une élite théocratique, et déformaient le crâne des enfants dès les premiers jours de la vie, à l’aide de moyens de pression variés. La déformation du crâne d’Ancón est une déformation antéro-postérieure oblique, brachycéphale, bilobée et asymétrique, sans trépanation ni déformation dentaire associée. C’est une variante bilobée du type Huaura de déformation crânienne, qui est associé aux régions de Chancay-Ancón et Lima. L’étude tomodensitométrique des variations d’épaisseur de la voûte, avec amincissement en regard des zones de pression, a montré que la déformation était intentionnelle, et caractérisée par une pression fronto-pariéto-temporale bilatérale surtout antérieure et dégressive d’avant en arrière, associée à une pression frontale, occipitale, et sagittale médiane. En l’absence de contexte et de datation, l’ancienneté du crâne étudié ne peut pas être précisée au long d’une période de presque trois millénaires, jusqu’à la domination Inca et l’arrivée des Espagnols (1532). Le crâne pourrait appartenir à l’une ou l’autre des cultures successives du site d’Ancón : Chavín, Baňos de Boza o Miramar, Lima, Wari, et Chancay (1200 à 1470), dont les céramiques représentent la déformation bilobée. Le crâne est probablement celui d’une femme âgée de plus de 45 ans à son décès, de statut social élevé, faisant partie de l’élite magico-religieuse, politique et économique dirigeante. L’étude de l’endocrâne a permis d’observer la déformation des veines superficielles et des lobes du cerveau. Il existe des signes de parodonpathie chronique à un stade avancé. Un abcès d’origine dentaire pourrait avoir été la cause du décès. Conclusions et perspectives : en ce qui concerne la pratique des déformations crâniennes, la région d’Ancón-Chancay et de Lima paraît être remarquable à trois égards : par le grand nombre de crânes déformés, par le grand nombre de crânes bilobés, et par la proportion importante de femmes, dont on peut supposer qu’elles étaient nées de familles nobles, et destinées dès l’enfance à faire partie de l’élite théocratique. La reconstitution 3D de l’épaisseur de la voûte crânienne a permis pour la première fois à notre connaissance de caractériser ce type de déformation, et pourrait permettre de reconstituer l’appareil déformateur. Seule la reprise des exhumations programmées sur le site d’Ancón, dans le cadre d’un projet prospectif pluridisciplinaire, pourrait permettre de mieux préciser la proportion d’individus à crâne déformé, la proportion des crânes bilobés, et le sex ratio, dans chaque contexte historique et socio-culturel de ce type de déformation crânienne intentionnelle ; et, peut-être, de retrouver in situ l’appareil déformateur correspondant. [less ▲]

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See detailEtude approchée des roulements rigides à billes chargé radialement, dans le cas des grandes vitesses
Debongnie, Jean-François ULg

Report (1992)

The classical rolling bearing theory lies on the assumption that the rotational speed is low. The simplest correction for high speeds consists in adding only the centrifugal load. But even in this frame ... [more ▼]

The classical rolling bearing theory lies on the assumption that the rotational speed is low. The simplest correction for high speeds consists in adding only the centrifugal load. But even in this frame, the problem is by far complicated. However, in the case of a radial load, it is possible to develop an approximated formulation which easily leads to realistic results. This elementary theory may be used as a basis of comparison for more evolved theories, which may be useful. [less ▲]

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See detailEtude archéologique et dendrochornologique de la maison du Pléban à Dinant
Hoffsummer, Patrick ULg; Bosson, Anne

in Archaeologia mediaevalis (1992), 15

The "Maison du Pléban" in Dinant is a timber framed house with old parts of the end of the 15th century, modified and enlarged during the 16th and 18th centuries.

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See detailEtude archéologique et dendrochronologique des charpentes de l'église de la Sainte-Vierge à Chaussée-Notre-Dame (Soignies)
Bavay, Gérard; Hoffsummer, Patrick ULg; Maggi, Christophe ULg et al

in Bulletin de la Commission royale des Monuments, Sites et Fouilles (2011), 23

Thanks to archaeological observations on roofs of this church during the restauration and also with the help of dendrochronology, new data were obtained on the evolution of this interesting gothic church ... [more ▼]

Thanks to archaeological observations on roofs of this church during the restauration and also with the help of dendrochronology, new data were obtained on the evolution of this interesting gothic church of the region Hainaut in Belgium [less ▲]

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See detailEtude archéologique et historique du château de Franchimont à Theux
Hoffsummer, Patrick ULg

Book published by Université de Liège (1982)

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See detailEtude astérosismologique du système KPD 1930+2752
Van Grootel, Valérie ULg

Master of advanced studies dissertation (2005)

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See detailEtude au microscope électronique à balayage de cellules normales ou cancéreuses fixées et déshydratées par différentes méthodes
Heinen, Ernst ULg; Pierard, Gérald ULg

in Bulletin de l'Académie Royale de Médecine de Belgique (1974), 161

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See detailEtude au microscope electronique a balayage du palais secondaire en formation chez le rat.
Baeckeland, E.; Heinen, Ernst ULg

in Bulletin de l'Association des Anatomistes (1977), 61(172), 61-70

Normal fetuses 14 to 17 days old were obtained from female Wistar rats. The palates have been studied, after dissection, by scanning electron microscopy. Palatal closure is achieved, in the median and ... [more ▼]

Normal fetuses 14 to 17 days old were obtained from female Wistar rats. The palates have been studied, after dissection, by scanning electron microscopy. Palatal closure is achieved, in the median and posterior region, by the elevation of the lateral palatine processus from a ventro-medial to a horizontal position; immediately after the horizontalization, they adhere to each other. Rostrally naso-palatine canal closure takes place later; it results from an epithelial and mesenchymal outgrowth under the nasal septum. The mutual adhesivity of the free edges of the lateral processes is noticeable. The pattern of the fusion surface has been considered, elements such as exfoliated cells, filopodes and microvilli are present. Their contribution to the adherence phenomenon is discussed. [less ▲]

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See detailEtude au microscope electronique a balayage et a transmission de l'epithelium amniotique chez la ratte en fin de gestation.
Baeckeland, E.; Heinen, Ernst ULg; Papart, Luc ULg

in Bulletin de l'Association des Anatomistes (1977), 61(172), 81-91

The pattern of the amniotic epithelium during the eight last days of pregnancy is described with the aid of scanning and transmission microscopy. A flattening of the cells appears near the term. Their ... [more ▼]

The pattern of the amniotic epithelium during the eight last days of pregnancy is described with the aid of scanning and transmission microscopy. A flattening of the cells appears near the term. Their area becomes progressively greater increasing their contact surface with the amniotic fluid. Simultaneaously, their microvilli become more numerous. During the 20th, the 21st and the 22nd days of pregnancy, we observed cytoplasmic processes emanating from the base of the cell interrupting the basal membrane and entering the underlying connective substance. No evidence of cell degeneration was seen. [less ▲]

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See detailEtude au microscope électronique des résidus de craquage catalytique
Bastin, David ULg; Lewis, Grégory

Report (2009)

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See detailEtude Belge HelpED :Effet de la revalidation érectile par iPDE 5 sur l’évolution psychosociale de l’homme pour dysfonction érectile
Andrianne, Robert ULg; Claes, Hubert; Opsomer, Reinier et al

in Belgian Journal of sexual health (2011)

Detailed reference viewed: 35 (6 ULg)