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See detailGéologie: notes de cours
Poty, Edouard ULiege

Learning material (2012)

Notes du cours de géologie de 1 bac en géologie et de 2 bac en géographie. Etude du cycle géologique

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See detailGeology, hydrogeology, mining industry and real estate assets along the new RAVeL Hannut-Huy-Modave-Ciney
Declercq, Pierre-Yves; Goemaere, Eric; Ruthy, Ingrid ULiege

Poster (2009, September 14)

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See detailGeology, palaeobotany and palynology of the Northeastern part of the Ardenne, Belgium
Steemans, Philippe ULiege; Vanguestaine, M.; Gerrienne, Philippe ULiege

Book published by Paleopalyno. Paléobot. Micropal. (2002)

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See detailLe géomarketing : introduction critique
Merenne-Schoumaker, Bernadette ULiege

in Howard E.B. (Ed.) Papers on Retail Development and consumer Behavior (1989)

The article attempts to analyze the new field of investigation that is the geomarketing address the following issues: definitions, tools and methods, application areas, strengths and weaknesses

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See detailGeomatallurgical approach and quantitative mineralogy of the Copper/gold deposit of Chelopech
Evrard, Maxime ULiege; Pirard, Eric ULiege

Poster (2012, September 11)

The Chelopech gold-copper mine is localized in the western part of Bulgaria and is one of the largest gold producer in Europe.An image processing method is applied on different flotation plant samples ... [more ▼]

The Chelopech gold-copper mine is localized in the western part of Bulgaria and is one of the largest gold producer in Europe.An image processing method is applied on different flotation plant samples: ore after milling, tailings 1; tailings 2, total tailings and concentrate. Polished sections made with these samples are analyzed in order to quantify the mineral amounts in each sample. The purpose of this quantitative analysis is to know the nature and proportions of mineral phases at each stage of the process. This study allow to know in which forms copper, arsenic and trace elements are present in the different samples and to track them during the different stages, which is very relevant information in order to improve ore treatment and tailings management. [less ▲]

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See detailGeomechanical constitutive modelling of a chalk partly saturated by oil and water
Collin, Frédéric ULiege; Delage, Pierre; Schroeder, Christian ULiege et al

in DGGT (Ed.) Eurock 2000 Symposium (2000)

Chalk in oil reservoir is generally saturated by two or more different fluids. In this paper, a constitutive law is proposed for the modelling of the mechanical behaviour of a chalk. The effects of the ... [more ▼]

Chalk in oil reservoir is generally saturated by two or more different fluids. In this paper, a constitutive law is proposed for the modelling of the mechanical behaviour of a chalk. The effects of the capillary pressure are taken into account. They are considered as an independent variable, as in the Barcelona’s basic model developed for unsaturated clay. On the other hand, internal friction and pore collapse are modelled as independent mechanisms. Eventually, the model predictions are compared with experimental results. [less ▲]

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See detailGeometallurgical Modelling of Low-Grade Itabirite Iron Ores from the Iron Quadrangle, Brazil
Martino, Rémi ULiege; Correa de Araujo, Armando; Gotelip Barbosa, Marcela et al

in Proceedings of the XXVIII International Mineral Processing Congress (IMPC 2016) (2016, September 11)

The Iron Quadrangle district is a world-class iron ore mining district in the region of Belo Horizonte, capital of Minas Gerais state, in Brazil. Many mining companies have been mining high-grade hematite ... [more ▼]

The Iron Quadrangle district is a world-class iron ore mining district in the region of Belo Horizonte, capital of Minas Gerais state, in Brazil. Many mining companies have been mining high-grade hematite ores for decades throughout the region. The mines reserves often include itabirite ores which are available in high volumes, but have lower iron grades than hematite ores and require elaborated mineral processing to meet the requirements of downstream steelmaking. Itabirite ores have acquired importance, with the depletion of high-grade hematite reserves due to their intensive mining. The objective of this paper is to propose a geometallurgical model for the processing of itabirite ores from an Iron Quadrangle deposit, which will allow predicting the behaviour of ores throughout the deposit, according to their local variations. An initial step consists in characterizing representative samples of the different ores to acquire mineralogical and textural data. Then, itabirite ores of known characteristics are processed with different techniques, in order to extract the trends and key parameters upon which the geometallurgical model is developed. At first, the model takes into account the particle size distribution and its shift during mining and screening, as well as the chemistry and mineralogy of the material. Then, using the previously identified key parameters such as iron recovery, the model predicts the composition of the processing products. Finally, this data is used to model the mineralogy and mass recovery of the products. The geometallurgical model is of great importance, as it is able to model the processing of any sampled ore throughout the deposit. The incorporation of the results in a mining block model will assist mine planning and opens new opportunities for an optimized mining schedule. [less ▲]

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See detailLe géomètre et le SIG
Billen, Roland ULiege

Article for general public (2010)

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See detailGéomètre: les enjeux de l'enseignement
Billen, Roland ULiege

Article for general public (2013)

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See detailGeometric and healing laws in simple stochastic models of fracture in a sputtering process
Dhulst, R.; Vandewalle, Nicolas ULiege; Ausloos, Marcel ULiege

in Physical Review. E : Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics (1997), 55(1), 189-193

We investigated two simple models of two-dimensional square lattice fracture under sputtering process conditions extending a previously studied model by Ausloos and Kowalski [Phys. Rev. B 45, 12 830 (1992 ... [more ▼]

We investigated two simple models of two-dimensional square lattice fracture under sputtering process conditions extending a previously studied model by Ausloos and Kowalski [Phys. Rev. B 45, 12 830 (1992)]. The models differ by the particle displacement rules during the fracture. Healing of the medium is observed in both models. This effect implies the formation of several thresholds during sputtering process fracture. They are distributed as a size-dependent power law. An avalanche like exponent is also obtained. We study this phenomenology within scaling arguments of classical percolation theory and mean-field arguments. [less ▲]

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See detailGeometric control of a pyridoxal-catalyzed aldol condensation
Koh, John T.; Delaude, Lionel ULiege; Breslow, Ronald

in Journal of the American Chemical Society (1994), 116(25), 11234-11240

A chiral cyclophane derivative of pyridoxal has been synthesized that has amino groups oriented specifically over one face of the cofactor. The compound catalyzes the formation of threonine and allo ... [more ▼]

A chiral cyclophane derivative of pyridoxal has been synthesized that has amino groups oriented specifically over one face of the cofactor. The compound catalyzes the formation of threonine and allo-threonine from glycine and acetaldehyde with enantioinductions that are a function of pH, reversing the optical selectivity between low pH and high pH. The stereochemical results are compared with those of structurally related pyridoxal cyclophanes that lack titratable catalytic groups. Explanations are advanced for this stereochemical reversal and for the otherwise surprising preference of most of these compounds to react on the more hindered face of the pyridoxal. Models indicate that the transamination intermediate is distorted by the transannular chain, and stereoelectronic arguments predict that this distortion should lead to reaction on the face that carries the chain, as observed. The stereochemical reversal with the attached (dimethylamino)alkyl group, as a function of pH, may reflect catalysis by the protonated form, but metal coordination by the basic form cannot be excluded. [less ▲]

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See detailGeometric Design of Scroll Expanders Optimized for Small Organic Rankine Cycles
Orosz, M.S.; Muller, A.V.; Dechesne, Bertrand ULiege et al

in Journal of Engineering for Gas Turbines & Power (2013)

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See detailGeometric ferroelectricity in fluoroperovskites
Garcia Castro, Andrés Camilo ULiege; Spaldin, Nicola A.; Romero, A. H. et al

in Physical Review. B, Condensed Matter and Materials Physics (2014), 89

We used first-principles calculations to investigate the existence and origin of the ferroelectric instability in the ABF3 fluoroperovskites. While the ground states of most ABF3 compounds are ... [more ▼]

We used first-principles calculations to investigate the existence and origin of the ferroelectric instability in the ABF3 fluoroperovskites. While the ground states of most ABF3 compounds are paraelectric (Pnma phase), we find that many fluoroperovskites have a ferroelectric instability in their high-symmetry cubic structure that is of similar amplitude to that commonly found in oxide perovskites. In contrast to the oxides, however, the fluorides have nominal Born effective charges, indicating a different mechanism for the instability.We show that the instability originates from ionic size effects, and is therefore in most cases largely insensitive to pressure and strain, again in contrast to the oxide perovskites. An exception is NaMnF3, where coherent epitaxial strain matching to a substrate with equal in-plane lattice constants destabilizes the bulk Pnma structure, leading to a ferroelectric, and indeed multiferroic, ground state with an unusual polarization/strain response. [less ▲]

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