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See detailEngineering geological mapping in Wallonia (Belgium) : present state and recent computerized approach
Delvoie, Simon ULg; Radu, Jean-Pol ULg; Ruthy, Ingrid ULg et al

Poster (2012, April)

An engineering geological map can be defined as a geological map with a generalized representation of all the components of a geological environment which are strongly required for spatial planning ... [more ▼]

An engineering geological map can be defined as a geological map with a generalized representation of all the components of a geological environment which are strongly required for spatial planning, design, construction and maintenance of civil engineering buildings. In Wallonia (Belgium) 24 engineering geological maps have been developed between the 70s and the 90s at 1/5,000 or 1/10,000 scale covering some areas of the most industrialized and urbanized cities (Liège, Charleroi and Mons). They were based on soil and subsoil data point (boring, drilling, penetration test, geophysical test, outcrop. . . ). Some displayed data present the depth (with isoheights) or the thickness (with isopachs) of the different subsoil layers up to about 50 m depth. Information about geomechanical properties of each subsoil layer,useful for engineers and urban planners, is also synthesized. However, these maps were built up only on paper and progressively needed to be updated with new soil and subsoil data. The Public Service of Wallonia and the University of Liège have recently initiated a study to evaluate the feasibility to develop engineering geological mapping with a computerized approach. Numerous and various data (about soil and subsoil) are stored into a georelational database (the geotechnical database – using Access, Microsoft®). All the data are geographically referenced. The database is linked to a GIS project (using ArcGIS, ESRI®). Both the database and GIS project consist of a powerful tool for spatial data management and analysis. This approach involves a methodology using interpolation methods to update the previous maps and to extent the coverage to new areas. The location (x, y, z) of each subsoil layer is then computed from data point. The geomechanical data of these layers are synthesized in an explanatory booklet joined to maps. [less ▲]

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See detailEngineering Geology Conditions of the Central Area of Shanghai : Preparation of the data for subsidence modelling
Dassargues, Alain ULg; Schroeder, Christian ULg; Monjoie, Albéric ULg

in Sixth International Congress of the International Association of Engineering Geology, Amsterdam (1990, August)

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See detailEngineering Multiferroism in CaMnO3
Bhattacharjee, Satadeep; Bousquet, Eric ULg; Ghosez, Philippe ULg

in Physical Review Letters (2009), 102

Structural instabilities of CaMnO3 are investigated from first principles. We point out that, on top of a strong antiferrodistortive instability responsible for its orthorhombic ground state, the cubic ... [more ▼]

Structural instabilities of CaMnO3 are investigated from first principles. We point out that, on top of a strong antiferrodistortive instability responsible for its orthorhombic ground state, the cubic perovskite structure of CaMnO3 also exhibits a weak ferroelectric instability. Although ferroelectricity is suppressed by antiferrodistortive motions, we show that it can be favored using strain or chemical engineering in order to make CaMnO3 multiferroic. We finally highlight that the ferroelectric instability of CaMnO3 is Mn-dominated. This illustrates that, contrary to common belief, ferroelectricity and magnetism are not necessarily exclusive but can be driven by the same cation. [less ▲]

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See detailEngineering of poly(2-oxazoline)s for a potential use in biomedical applications
Legros, Camille ULg

Doctoral thesis (2014)

This PhD work is based on the design of poly(2-oxazoline) (POx) hydrogels and nanogels, by chemical or physical cross-linking, aimed to be used for biomedical applications. Nanogels were first prepared in ... [more ▼]

This PhD work is based on the design of poly(2-oxazoline) (POx) hydrogels and nanogels, by chemical or physical cross-linking, aimed to be used for biomedical applications. Nanogels were first prepared in dilute media and in inverse emulsion based on a statistical copolymer made of 2-ethyl-2-oxazoline and ethylene imine units. These stimuli-responsive nanogels were swelling in acidic media and were cleaved in reductive environment. They proved to be non-cytotoxic and act as protein repellent. Second, a reactive platform based on a statistical POx polymer bearing aldehyde functionalities was engineered, enabling the synthesis of graft and cross-linked POx. Last, a block copolymer made of 2-methyl- and 2-isopropyl-2- oxazoline units, proved to self-assemble into micelles when heated above its LCST, for a short period of time (< 1h30). When annealed for a longer time (> 1h30), crystallization-driven self-assembly led to the formation of different morphologies (fiber rods and cross-linked micelles). [less ▲]

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See detailEngineering resistance against CMD in model and Indian preferred cassava varieties
Vanderschuren, Hervé ULg

Scientific conference (2016, August 30)

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See detailEngineering resistance to geminiviruses--review and perspectives.
Vanderschuren, Hervé ULg; Stupak, Martin; Futterer, Johannes et al

in Plant biotechnology journal (2007), 5(2), 207-20

Following the conceptual development of virus resistance strategies ranging from coat protein-mediated interference of virus propagation to RNA-mediated virus gene silencing, much progress has been ... [more ▼]

Following the conceptual development of virus resistance strategies ranging from coat protein-mediated interference of virus propagation to RNA-mediated virus gene silencing, much progress has been achieved to protect plants against RNA and DNA virus infections. Geminiviruses are a major threat to world agriculture, and breeding resistant crops against these DNA viruses is one of the major challenges faced by plant virologists and biotechnologists. In this article, we review the most recent transgene-based approaches that have been developed to achieve durable geminivirus resistance. Although most of the strategies have been tested in model plant systems, they are ready to be adopted for the protection of crop plants. Furthermore, a better understanding of geminivirus gene and protein functions, as well as the native immune system which protects plants against viruses, will allow us to develop novel tools to expand our current capacity to stabilize crop production in geminivirus epidemic zones. [less ▲]

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See detailEngineering RNA-mediated resistance to geminiviruses in cassava
Vanderschuren, Hervé ULg

Doctoral thesis (2007)

Cassava mosaic disease (CMD) is the most important disease affecting cassava in Africa. The disease is caused by several whitefly-transmitted geminivirus species. The increasing impact of geminivirus ... [more ▼]

Cassava mosaic disease (CMD) is the most important disease affecting cassava in Africa. The disease is caused by several whitefly-transmitted geminivirus species. The increasing impact of geminivirus-caused diseases on cassava production due to the recent pandemics has urged the scientific community to provide stable virus resistance in cassava. Advances in engineering virus resistance via RNA-based strategies have opened promising perspectives for the production of transgenic geminivirus resistant plants. In this thesis, three RNA-based strategies are developed to improve the resistance to African cassava mosaic virus (ACMV) in transgenic cassava. The first strategy was based on expression of antisense viral sequences. Three different viral coding sequences were targeted and several transgenic cassava lines expressing antisense viral sequences were ACMV resistant. The second strategy was to express intron hairpin double-stranded RNAs (dsRNAs) homologous to ACMV bidirectional Promoter. Transgenic cassava lines expressing small dsRNAs homologous to the ACMV promoter were not completely immune to ACMV infection but showed an enhanced recovery phenotype as cornpared to the infected wild-type cassava plants. The third strategy relied on the expression of intron hairpin dsRNAs homologousto viral coding sequences. Transgenic cassava lines expressing high levels of small RNAs homologous to the viral coding sequences were immune under ACMV infection tests in which virus load had been sufficient to break resistance elaborated with the first two strategies. This work demonstrated that ACMV resistance could be achieved in cassava via an RNA-based approach and that the strategy used (i.e. antisense RNA, hairpin dsRNA against non-coding viral sequence, hairpin dsRNA against viral coding sequences) had an impact on the resistance level. [less ▲]

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See detailEngineering Specificity Changes on a RanBP2 Zinc Finger that Binds Single-Stranded RNA.
Vandevenne, Marylène ULg; O'Connell, M.R.; Helder, S. et al

in Angewandte Chemie International Edition (2014)

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See detailEngineering the stability of a cold-active alpha-amylase
D'Amico, Salvino; Gerday, Charles ULg; Feller, Georges ULg

Poster (1999)

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See detailEngineering three-dimensional chains of porous nanoballs from a 1,2,4-triazole-carboxylate supramolecular synthon
Naik, A. D.; Dǐrtu, M. M.; Léonard, Alexandre ULg et al

in Crystal Growth & Design (2010), 10(4), 1798-1807

Glycine ethyl ester was recruited in an amine exchange process based on a transamination to afford ethyl 4H-1,2,4-triazol-4-yl-acetate (L1). The acid hydrolysis of this molecule leads to quantitative ... [more ▼]

Glycine ethyl ester was recruited in an amine exchange process based on a transamination to afford ethyl 4H-1,2,4-triazol-4-yl-acetate (L1). The acid hydrolysis of this molecule leads to quantitative isolation of 4H-1,2,4-triazol-4-yl acetic acid (L2). This versatile synthon crystallizes in a noncentrosymmetric orthorhombic space group (Fdd2) with Z = 16. This crystal structure is the first one for a 1,2,4-triazole ligand constructed from an amino acid derivative. The strong intermolecular hydrogen bonding O-HN (2.570(3)Å) connects molecules into infinite one-dimensional chains running parallel to the b axis, and the structure is further extended by numerous but moderate strength hydrogen bonds (C-HO). Prominent features of L2 are the presence of diverse potential coordinating groups such as carboxylic acid and triazole on the same framework as well as the inherent flexibility of the ligand backbone. Reaction of L1 or L2 with aq. Cu(BF 4) 2 in aq. DMF gives dark blue crystals which crystallize in a noncentrosymmetric, cubic space group (I4̌3m) and which were formulated as [Cu 3(μ 3-O)(L2) 3(H 2O) 3]BF 4H 2O (C1). The self-assembly of C 3-symmetric, μ 3-oxo bridged triangular tricopper secondary building blocks (SBB) formed an unique architecture which encompasses voluminous nanoball voids of 1 nm. The total solvent accessible volume is 4477.5 Å 3 which accounts for 48% of the cell volume. The crystal network stability was studied by thermogravimetric analysis (TGA)'differential thermal analysis (DTA) and scanning electron microscopy (SEM) analyses. Sorption properties and gas storage capacities were measured by BET. C1 shows no preference for N 2(g), but a reversible H 2(g) uptake of 21 cm 3/g was observed. Morphology analysis by SEM on single crystals of C1 shows "ultrawellś of square shape irregularly located on the surface, whose origin is due to desolvation or crystal defects. Mercury porosimetry measurements reveal pore size distribution with a diameter ranging from 350 nm to 2.3 μm © 2010 American Chemical Society. [less ▲]

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See detailEngineering Ultrafast Magnetism
Radu, I.; Stamm, C.; Eschenlohr, A. et al

in Ultrafast Magnetism I (2015)

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See detailEnglish and French Canadians, Flemish and Francophone Belgians. The Linguistic Composition of the Canadian and Belgian Federal Cabinet
Reuchamps, Min ULg

Conference (2007, April 27)

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of ... [more ▼]

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of Daniel Elazar’s seminal work on federalism in plural societies and of Arend Lijphart’s on consociationalism offers a theoretical framework which can be usefully applied to study the distribution of power between the two main ethno-linguistic communities at the highest level of the state. Using the existing “model of points” and the author’s own “model of the weight of ministerial portfolios”, this paper explores the linguistic composition of the federal governments in both countries over the last thirty years (1970-2006). Whereas the Belgian Constitution has required since 1970 that the federal cabinet be staffed by an equal number of Flemish and Francophone ministers, the Canadian Constitution does not require such a linguistic parity and therefore leaves a greater freedom for the composition of the government. On this background, two logics may explain the linguistic composition in the two cases: a logic of transaction between the two main communities and a logic of representation. The paper opens, on the one hand, with the elaboration of the theoretical framework combining the works of Elazar and Lijphart and, on the other hand, with the construction of the two models. The framework and the models are applied to each case, emphasizing the logic of transaction and the logic of representation. On the basis of this examination, this paper concludes by suggesting that Flemish and Francophone Belgians as well and English and French Canadians benefit from the composition of the federal cabinet. The conclusion opens—new—ways and means to hinder political tensions in plural societies through the institutional arrangement. [less ▲]

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See detailEnglish and Spanish Size Noun-constructions, a locus of ongoing grammaticalization
Brems, Lieselotte ULg; Verveckken, Katrien

Conference (2008)

Detailed reference viewed: 26 (5 ULg)