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See detailGlobal power grids for harnessing world renewable energy
Chatzivasileiadis, Spyros; Ernst, Damien ULg; Andersson, Göran

in Jones, Lawrence (Ed.) Renewable Energy Integration: Practical Management of Variability, Uncertainty and Flexibility in Power Grids (2014)

The Global Grid advocates the connection of all regional power systems into one electricity transmission system spanning the whole globe. Power systems are currently forming larger and larger ... [more ▼]

The Global Grid advocates the connection of all regional power systems into one electricity transmission system spanning the whole globe. Power systems are currently forming larger and larger interconnections. Environmental awareness and increased electricity consumption leads more investments towards renewable energy sources, abundant in remote locations (off-shore or in deserts). The Global Grid will facilitate the transmission of this “green” electricity to load centers, serving as backbone. This chapter elaborates on the concept presenting four stages that could gradually lead to the development of a globally interconnected power network. Quantitative analyses are carried out for all stages, demonstrating that a Global Grid is both technically feasible and economically competitive. Real price data from Europe and the USA are used to identify the potential of intercontinental electricity trade, showing that substantial profits can be generated through such interconnections. [less ▲]

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See detailGlobal prevalence and skeletal implications of vitamin D inadequacy
Reginster, Jean-Yves ULg; Richy, Florent; Rabenda, Véronique ULg et al

in Annals of the Rheumatic Diseases (2005, June), 64(Suppl.III), 362

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See detailA Global Procedure for the Measurement of Selected POPs in Food
PIRARD, Catherine ULg; Focant, Jean-François ULg

Scientific conference (2007, June)

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See detailA Global Procedure for the Measurement of Selected POPs in Food
Focant, Jean-François ULg; PIRARD, Catherine ULg

Scientific conference (2007, June)

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See detailGlobal Sensitivity Analysis applied to Total Energy Use in Buildings
Ruiz Flores, Roberto ULg; Bertagnolio, Stéphane ULg; Lemort, Vincent ULg

in Proceedings of the 2nd International High Performance Buildings Conference (2012, July 16)

The work presented in this paper has been carried out in the frame of the IEA-ECBCS Annex 53 project: “Total Energy Use in Buildings: Analysis and evaluation methods”. The aim of this work is to present a ... [more ▼]

The work presented in this paper has been carried out in the frame of the IEA-ECBCS Annex 53 project: “Total Energy Use in Buildings: Analysis and evaluation methods”. The aim of this work is to present a methodology to identify the most influential parameters affecting the final energy consumption in office buildings. In order to represent buildings and HVAC systems, a representative typology was defined, modeled and simulated and subsequently a global sensitivity analysis (variance-based method) was performed. This paper provides useful information to future works related to design building decisions, building calibration, energy management strategy, etc. helping to detect and rank those factors which need to be better measured and/or estimated, in order to improve building energy efficiency. [less ▲]

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See detailGlobal Social Economy: Historical Context and Current Progress
Defourny, Jacques ULg; Develtere, Patrick; Zhao, Li

in Journal of Comparative Economic and Social Systems = Jingji Shehui Tizhi Bijiao (2011), 153(1), 146-157

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See detailGlobal stabilization of feedforward systems with exponentially unstable Jacobian linearization
Grognard, F.; Sepulchre, Rodolphe ULg; Bastin, G.

in Systems & Control Letters (1999), 37(2), 107-115

The global stabilization of a class of feedforward systems having an exponentially unstable Jacobian linearization is achieved by a high gain feedback saturated at a low level. The control law forces the ... [more ▼]

The global stabilization of a class of feedforward systems having an exponentially unstable Jacobian linearization is achieved by a high gain feedback saturated at a low level. The control law forces the derivatives of the state variables to small values along the closed loop trajectories. This “slow control” design is illustrated with a benchmark example and its limitations are emphasized. [less ▲]

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See detailGlobal strategy for the development of estrogenic compounds detection screening test
Collodoro, Mike ULg; Makasinga, Elu; Lemaire, Pascale ULg et al

Poster (2007, May)

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See detailGlobal structural behaviour of a building frame further to its partial destruction by column loss
Luu, Nguyen Nam Hai; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Ofner, Robert; Beg, Darko; Fink, Josef (Eds.) et al EUROSTEEL 2008, 5th European Conference on Steel and Composite Structures (2008, September)

In 1969, a catastrophic event occurred in UK at the Ronal Point residential building where the progressive collapse of the building, initiated by a localized gas explosion, was observed. Further to this ... [more ▼]

In 1969, a catastrophic event occurred in UK at the Ronal Point residential building where the progressive collapse of the building, initiated by a localized gas explosion, was observed. Further to this event, some codes and standards, and in particular the British Standards, impose to the designer to ensure the structural integrity of building in order to avoid the progressive collapse of the latter further to an exceptional action. In fact, the progressive collapse of a building is the result of a change in the structural system and of the load path associated to the loss of one or more main structural members. In other words, the existing load path is suddenly modified and the loads supported by the building are reported to the foundation through an alternative load path. Accordingly, the remaining structural members are overloaded by additional loads; the latter have to be able to support these loads and to possess a sufficient ductility. In the last decade, researches on this topic were initiated at the Argenco Department of Liège University. The present paper reflects part of these activities; in particular, some investigations dedicated to the investigation of the behaviour of a frame further to a column loss are presented. In another article presented by J.F Demonceau, H.N.N. Luu and J.P Jaspart within the present conference is devoted to the investigation of the behaviour of the frame when significant membranar forces developed within the structure. In particular, in this paper, a simplified substructure which is able to simulate the behaviour of a structure further to a column loss is defined. The present paper presents the analytical methods requested to define the parameters influencing the response of the simplified substructure. [less ▲]

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See detailGlobal synchronization on the circle
Sarlette, Alain ULg; Tuna, Sezai Emre; Blondel, Vincent et al

in Proceedings of the 17th IFAC World Congress (2008, July)

The convexity arguments used in the consensus literature to prove synchronization in vector spaces can be applied to the circle only when all agents are initially located on a semicircle. Existing ... [more ▼]

The convexity arguments used in the consensus literature to prove synchronization in vector spaces can be applied to the circle only when all agents are initially located on a semicircle. Existing strategies for (almost-)global synchronization on the circle are either restricted to specific interconnection topologies or use auxiliary variables. The present paper first illustrates this problem by showing that weighted, directed interconnection topologies can be designed to make any reasonably chosen configuration of the agents on the circle a stable equilibrium of a basic continuous-time consensus algorithm. Then it proposes a so-called “gossip algorithm”, which achieves global asymptotic synchronization on the circle with probability 1 for a large class of interconnections, without using auxiliary variables, thanks to the introduction of randomness in the system. [less ▲]

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See detailGlobal tracking and state estimation with non- smooth impacts for a mass confined to an n-dimensional half-space
Forni, Fulvio ULg; Teel, Andrew; Zaccarian, Luca

in IFAC Conference on Analysis and Design of Hybrid Systems (ADHS 12) (2012)

We formulate tracking and state-estimation problems of a translating mass moving in an n-dimensional space and impacting on a hyperplane. Due to the discontinuous trajectories arising from the nonsmooth ... [more ▼]

We formulate tracking and state-estimation problems of a translating mass moving in an n-dimensional space and impacting on a hyperplane. Due to the discontinuous trajectories arising from the nonsmooth impacts, we use hybrid systems stability analysis tools to establish that 1) a tracking control algorithm and 2) an observer algorithm guarantee global exponential stability. Then, based on a separation principle, we combine the two constructions above to design a dynamic output feedback controller ensuring asymptotic tracking. [less ▲]

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See detailA Global Understanding of Transient Surface Flows Applied to Hydrology and River Processes
Pirotton, Michel ULg

in XI International Conference on Computational Methods in Water Resources (1996, July 22)

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See detailGlobal water and salt budget of the Aral Sea from 1960 to 1991.
Sirjacobs, Damien ULg; Grégoire, Marilaure ULg; Delhez, Eric ULg et al

Conference (2003, May)

Focusing on the global water and salt budget of the Aral sea from 1960 till 1991, a compilation of data available in the litterature is analysed with simple models and compared to the measured evolution ... [more ▼]

Focusing on the global water and salt budget of the Aral sea from 1960 till 1991, a compilation of data available in the litterature is analysed with simple models and compared to the measured evolution of the sea. [less ▲]

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See detailGlobal X-ray Properties of the O and B Stars in Carina
Nazé, Yaël ULg; Broos, P. S.; Oskinova, L. et al

in Astrophysical Journal Supplement Series (2011), 194

The key empirical property of the X-ray emission from O stars is a strong correlation between the bolometric and X-ray luminosities. In the framework of the Chandra Carina Complex Project, 129 O and B ... [more ▼]

The key empirical property of the X-ray emission from O stars is a strong correlation between the bolometric and X-ray luminosities. In the framework of the Chandra Carina Complex Project, 129 O and B stars have been detected as X-ray sources; 78 of those, all with spectral type earlier than B3, have enough counts for at least a rough X-ray spectral characterization. This leads to an estimate of the L [SUB]X[/SUB]-L [SUB]BOL[/SUB] ratio for an exceptional number of 60 O stars belonging to the same region and triples the number of Carina massive stars studied spectroscopically in X-rays. The derived log(L [SUB]X[/SUB]/L [SUB]BOL[/SUB]) is -7.26 for single objects, with a dispersion of only 0.21 dex. Using the properties of hot massive stars listed in the literature, we compare the X-ray luminosities of different types of objects. In the case of O stars, the L [SUB]X[/SUB]-L [SUB]BOL[/SUB] ratios are similar for bright and faint objects, as well as for stars of different luminosity classes or spectral types. Binaries appear only slightly harder and slightly more luminous in X-rays than single objects; the differences are not formally significant (at the 1% level), except for the L [SUB]X[/SUB]-L [SUB]BOL[/SUB] ratio in the medium (1.0-2.5 keV) energy band. Weak-wind objects have similar X-ray luminosities but they display slightly softer spectra compared with "normal" O stars with the same bolometric luminosity. Discarding three overluminous objects, we find a very shallow trend of harder emission in brighter objects. The properties of the few B stars bright enough to yield some spectral information appear to be different overall (constant X-ray luminosities, harder spectra), hinting that another mechanism for producing X-rays, besides wind shocks, might be at work. However, it must be stressed that the earliest and X-ray brightest among these few detected objects are similar to the latest O stars, suggesting a possibly smooth transition between the two processes. [less ▲]

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See detailGlobalisation
Geuens, Geoffrey ULg

in Quaderni : la Revue de la Communication (2007), 63 ("Nouveaux mots du pouvoir. Fragments d'un abécédaire")(printemps), 51-53

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See detailGlobalisation
Geuens, Geoffrey ULg

in Durand, Pascal (Ed.) Les Nouveaux Mots du Pouvoir. Abécédaire critique (2007)

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See detailLa globalisation : cinq thèses et trois scénarios
Jacquemain, Marc ULg

Conference (2012, April)

La communication reprend l'idée de Zaki Laïdi, selon laquelle au-delà de l'accélération des flux économiques, la globalisation doit être considérée comme un transformation des représentations du monde. Il ... [more ▼]

La communication reprend l'idée de Zaki Laïdi, selon laquelle au-delà de l'accélération des flux économiques, la globalisation doit être considérée comme un transformation des représentations du monde. Il propos d'apppliquer cette logique à quelques grands travaux sociologiques récents sur la globalisation et montrer comment ces travaux eux-mêmes contribuent à faconner des "imaginaires" au sens de Zaki Laïdi [less ▲]

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See detailLa globalisation des mouvements migratoires
Martiniello, Marco ULg

Scientific conference (2011, January 06)

Detailed reference viewed: 10 (0 ULg)