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See detailConverging to and escaping from the global equilibrium: Isostables and optimal control
Mauroy, Alexandre ULg

in Proceedings of the 53rd IEEE Conference on Decision and Control (2014, December)

This paper studies the optimal control of trajectories converging to or escaping from a stable equilibrium. The control duration is assumed to be short. When the control is turned off, the trajectories ... [more ▼]

This paper studies the optimal control of trajectories converging to or escaping from a stable equilibrium. The control duration is assumed to be short. When the control is turned off, the trajectories have not reached the target and they subsequently evolve according to the free motion dynamics. In this context, we show that the problem can be formulated as a finite-horizon optimal control problem which relies on the notion of isostables. For linear and nonlinear systems, we solve this problem using Pontryagin’s maximum principle and we study the relationship between the optimal solutions and the geometry of the isostables. Finally, optimal strategies for choosing the magnitude and duration of the control are considered. [less ▲]

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See detailConvers et le crime impuni ou La Défragmentation
Mouton, Charles ULg

Book published by Persée (2008)

Detailed reference viewed: 10 (0 ULg)
See detailConversation autour de "Drive" de Nicolas Winding Refn
Tomasovic, Dick ULg

Conference given outside the academic context (2012)

Detailed reference viewed: 93 (8 ULg)
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See detailConversation avec David Toscana à l'occasion de la traduction en français du roman 'Un train pour Tula'
Vanden Berghe, Kristine ULg

Conference given outside the academic context (2010)

Detailed reference viewed: 18 (3 ULg)
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See detailConversation sur la couleur des hommes
Rubbers, Benjamin ULg

Article for general public (2004)

Cet article porte sur l'héritage du racisme colonial dans le Congo contemporain.

Detailed reference viewed: 37 (11 ULg)
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See detailLa conversion des enfants juifs cachés dans la région liégeoise. Histoire et mémoire (1942-2010)
Genin, Vincent ULg

in Revue d'Histoire Ecclésiastique (2014), 109(3-4), 815-856

There is literature aplenty concerning the rescue of Jewish children in Belgium during the Second World War. However, it appears that some questions have remained unanswered to his day about the ... [more ▼]

There is literature aplenty concerning the rescue of Jewish children in Belgium during the Second World War. However, it appears that some questions have remained unanswered to his day about the consequences and the memory processes of these rescues by the Catholic clergy of Liege. After a brief overview of said rescue activities (1942-1944), this contribution will broach, supported by hitherto unexplored archives, three issues: 1. what are the consecutives stages of the memory process from 1944 to 2010? 2. How was this recognition expressed and what were its manifestations or why did it fail to occur? 3. Who are the protagonists –Christians, Jews, Israelis- of this process and what are their interests? [less ▲]

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See detailConversion from Excel into Aleph sequential
Renaville, François ULg; Thirion, Paul ULg

Poster (2009, September 08)

Libraries must sometimes load records that are not available to them in a bibliographic format standard (Marc21, Unimarc...): integration of the book database of an academic research center, list of new e ... [more ▼]

Libraries must sometimes load records that are not available to them in a bibliographic format standard (Marc21, Unimarc...): integration of the book database of an academic research center, list of new e-journals bought by the library... This can make the conversion procedure of the data to the Aleph sequential format quite hard. Sometimes the records are only available in Excel. This poster explains how to convert easily in a few steps an Excel file into Aleph sequential in order to load records with manage-18. Next to this procedure, 'tab_fix' and 'fix_doc_do_file_08' are of course used to correct or complete the data. The strength of that method is that no extra programming is needed! Moreover, a basic knowledge of Excel is enough to understand and use that method. [less ▲]

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See detailConversion from HST ACS and STIS auroral counts into brightness, precipitated power, and radiated power for H2 giant planets
Gustin, Jacques ULg; Bonfond, Bertrand ULg; Grodent, Denis ULg et al

in Journal of Geophysical Research. Space Physics (2012), 117

The STIS and ACS instruments onboard HST are widely used to study the giant planet's aurora. Several assumptions have to be made to convert the instrumental counts into meaningful physical values (type ... [more ▼]

The STIS and ACS instruments onboard HST are widely used to study the giant planet's aurora. Several assumptions have to be made to convert the instrumental counts into meaningful physical values (type and bandwidth of the filters, definition of the physical units, etc…), but these may significantly differ from one author to another, which makes it difficult to compare the auroral characteristics published in different studies. We present a method to convert the counts obtained in representative ACS and STIS imaging modes/filters used by the auroral scientific community to brightness, precipitated power and radiated power in the ultraviolet (700-1800 Å). Since hydrocarbon absorption may considerably affect the observed auroral emission, the conversion factors are determined for several attenuation levels. Several properties of the auroral emission have been determined: the fraction of the H[SUB]2[/SUB] emission shortward and longward of the HLy-α line is 50.3% and 49.7% respectively, the contribution of HLy-α to the total unabsorbed auroral signal has been set to 9.1% and an input of 1 mW m[SUP]-2[/SUP] produces 10 kR of H[SUB]2[/SUB] in the Lyman and Werner bands. A first application sets the order of magnitude of Saturn's auroral characteristics in the total UV bandwidth to a brightness of 10 kR and an emitted power of ˜2.8 GW. A second application uses published brightnesses of Europa's footprint to determine the current density associated with the Europa auroral spot: 0.21 and 0.045 μA m[SUP]-2[/SUP] assuming no hydrocarbon absorption and a color ratio of 2, respectively. Factors to extend the brightnesses observed with Cassini-UVIS to total H[SUB]2[/SUB] UV brightnesses are also provided. [less ▲]

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See detailConversion of a B-Rep CAD model to an implicit representation in the context of the X-FEM
Mouton, Thibaud ULg; Béchet, Eric ULg

Conference (2011, November)

This paper deals with the alternative representation of parametric CAD models in the context of the Extended Finite Element Method (X-FEM) [1]. Partition of unity methods like the X-FEM allows to embed in ... [more ▼]

This paper deals with the alternative representation of parametric CAD models in the context of the Extended Finite Element Method (X-FEM) [1]. Partition of unity methods like the X-FEM allows to embed in finite element functional spaces any discontinuity. It is so theoretically possible to simulate a complete model without any of its geometrical features appearing in the mesh. Nevertheless, X-FEM was at first only used in geometrically simple application (e.g. cracks) due to the lack of method to make features of a complex CAD model to implicitly appear in the functional spaces. The geometry of the crack was originally modeled using Level Sets because of their ability to handle complex surfaces and naturally take into account changes in topology and geometry encountered with moving interfaces. Level Sets modelling has been recently extended in combination with a Constructive Solid Geometry (CSG) approach [2] but this method is still limited by the use of globally defined Level Sets. The proposed algorithm extends the Level Sets modelisation of the geometry using the Boundary Representation (B-Rep) of the object. In this case, Level Sets are only locally defined (Fig a). A sub- mesh is then obtained by cutting a primary fixed mesh (encompassing the CAD model) along with isozero of each Level Set (Fig b). Resulting sub-elements are then sorted to build a temporary topology. One of the difficulties involved is then to match the temporary topology with the original B-Rep topology (Fig c). The aim is to recover unmodified entities and detect deleted or new entities that could appear during the deformation of the object. Finally, examples of computations in linear elasticity will be shown. [less ▲]

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See detailConversion of agricultural and Industrial Wastes for Cellulose hydrolysis
Paquot, Michel ULg; Foucart, M.; Desmons, M. et al

Book (1983)

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See detailConversion of carbohydrates under microwave heating
Richel, Aurore ULg; Paquot, Michel ULg

in Chang, C.F. (Ed.) Carbohydrates - Comprehensive Studies on Glycobiology and Glycotechnology (2012)

The non-energetic valorisation of renewable resources using efficient and eco-friendly methodologies is the central axis of the "green chemistry" concept. In particular, the chemical and chemo-enzymatical ... [more ▼]

The non-energetic valorisation of renewable resources using efficient and eco-friendly methodologies is the central axis of the "green chemistry" concept. In particular, the chemical and chemo-enzymatical transformations of carbohydrates arising from the hydrolysis of non-edible vegetal feedstock (i.e., lignocellulosic biomass) are a widely explored thematic for the production of new high-added value materials, synthons, and platform chemicals. Since the seminal works of Gedye and Giguere in 1986, the use of microwaves as a non-conventional heating source has gained large attention in organic chemistry. Due to commonly observed acceleration in reactions rates and improved selectvities and yields, microwave heating has progressively emerged as a green chemistry technology. Minimizing both energy consumption (via the reduction of temperature and reaction times) and wastes (by improvement of selectivity), microwaves has enjoyed significant adoption by the research community. This chapter describes the use of microwave processes to mediate key reactions in the field of carbohydrates chemistry. Some examples of typical carbohydrates reactions (glycosylations, hydroxyl groups’ protection, etc.) under microwave conditions are displayed and highlight the benefits of this microwave approach in terms of yields, atom efficiency, environmental factor, and carbon efficiency. [less ▲]

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See detailConversion of green note aldehydes into alcohols by yeast alcohol dehydrogenase
Fauconnier, Marie-Laure ULg; Mpambara, A.; Delcarte, Jérôme et al

in Biotechnology Letters (1999), 21(7), 629-633

‘Green note’ aldehydes were successfully reduced into their corresponding alcohol by commercial yeast alcohol dehydrogenase. Among different yeasts tested for their ability to convert (Z)-3-hexenal into ... [more ▼]

‘Green note’ aldehydes were successfully reduced into their corresponding alcohol by commercial yeast alcohol dehydrogenase. Among different yeasts tested for their ability to convert (Z)-3-hexenal into (Z)-3-hexenol, Pichia anomala gave the best results. Conversion yields higher than 90% were also obtained by directly conducting the reaction in the medium where (Z)-3-hexenal is produced by the action of lipoxygenase and hydroperoxide lyase on <br />linolenic acid. [less ▲]

Detailed reference viewed: 19 (1 ULg)
See detailConversion of green note aldehydes into alcohols by yeast alcohol dehydrogenase
Fauconnier, Marie-Laure ULg; Mpambara, A.; Delcarte, J. et al

Poster (1999, July 11)

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See detailConversion of waste glycerol into valuable biopolyesters
Cavalheiro, J.M; de Almeida, Catarina; Cesario, Teresa et al

Poster (2010, September 06)

Detailed reference viewed: 4 (0 ULg)
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See detailConversion simple et Darapti: Alexandre d’Aphrodise et autres interprétations des Premiers Analytiques, 25a14-17
Gavray, Marc-Antoine ULg

in Beets, François; Gavray, Marc-Antoine (Eds.) Logique et Ontologie: perspectives synchroniques et diachroniques. Liber amicorum in honorem Huberti Hubiani (2005)

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See detailConverting the legend of the Soil Map of Belgium into the World Reference Base for Soil Resources: Lessons from correlating national soil survey data to an international soil classification system
Bouhon, Antoine; Dondeyne, Stefaan; Legrain, Xavier ULg et al

Poster (2012, July 03)

Soils in Belgium were mapped between 1947 and 1991 and published at a 1:20000 scale. These maps are used in land consolidation projects and for assessing soils’ vulnerability to erosion and pollution ... [more ▼]

Soils in Belgium were mapped between 1947 and 1991 and published at a 1:20000 scale. These maps are used in land consolidation projects and for assessing soils’ vulnerability to erosion and pollution. Integration of land-use and environmental policies within the European Union however requires a harmonization of different national soil classification systems. With the World Reference Base for Soil Resources (WRB) as common classification system within the Union, the authorities of Flanders and Wallonia commissioned a study to elaborate a methodology for converting the Belgian soil legend into WRB. The Belgian legend is based on field properties such as texture, drainage status and profile development. The WRB classification is based on diagnostic features defined by morphological, physical and chemical properties. A key and software programme have been developed to convert the Belgian units into WRB units. However, as many Belgian units could not unequivocally be translated into WRB units, additional guidelines had to be derived based on soil survey data classified according to WRB. The data show that principles of the legend shifted over time or were interpreted differently to take regional specificities into account. To overcome resulting ambiguities it is proposed to establish a database of reference soil profiles. Whereas, overall WRB is satisfactory for classifying soils at national level, the experience also shows that some WRB concepts may benefit from revisions to facilitate its correlation with national soil survey data. [less ▲]

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See detailConverting the legend of the Soil Map of Belgium into the World Reference Base for Soil Resources: Strenght and constraints of using WRB as a map legend
Dondeyne, Stefaan; Bouhon, Antoine; Legrain, Xavier ULg et al

Conference (2012, July 03)

Within the European Union, there is a general interest to prepare joint soil maps at a 1:250000 scale in order to harmonise agricultural and environmental policies. The World Reference Base for Soil ... [more ▼]

Within the European Union, there is a general interest to prepare joint soil maps at a 1:250000 scale in order to harmonise agricultural and environmental policies. The World Reference Base for Soil Resources (WRB) has been adopted as the common soil classification system within the EU. As soil surveys in most member states were conducted independently, the challenge is now to convert the national legends into a common WRB legend. Based on our experiences from converting the legend of the Soil Map of Belgium to WRB, we discuss the strengths and constraints of using WRB for both large scale (1:50000) and small scale (1:250000) maps. By using WRB Reference Soil Groups with one or two main qualifiers, the principal soil information of the original 1:20000 scale Soil Map of Belgium can be represented. Inevitably the conversion to WRB leads to some loss of information as details on soil texture, drainage and substratum get generalised into broader categories in WRB. This generalisation however can be neatly presented on 1:50000 scale maps. Being less complex than the original maps, these maps have the advantage to provide better insights into the regional soil geography. Moreover, as they are built on international classification concepts, the historical soil maps are made accessible to a wider audience. The conversion into WRB units also allowed for a straightforward generalisation and production of small scale maps (1:250000) which should be suitable for producing a soil map at European level. [less ▲]

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See detailConvex Approximation Methods for Large Scale Structural Problems
Duysinx, Pierre ULg

in Proceedings of the 9th Nordic Seminar on Computational Mechanics (NSCM IX) (1996, October)

Detailed reference viewed: 28 (0 ULg)