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Peer Reviewed
See detailEvolution diurne des profils thermiques inversifs les plus courants observés le long de la tour du Bol d'Air au SSW de Liège
Grilli-Delrez, A.; Erpicum, Michel ULg

in Bulletin de la Société Géographique de Liège (1984), 20

Detailed reference viewed: 16 (3 ULg)
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See detailEvolution du bilan d'approvisionnement en céréales de la Belgique de 1970/71 à 2003/04
Burny, Philippe ULg; Matendo, Sadrac; Duquesne, Brigitte ULg

in CRA-w; FUSAGx (Eds.) Livre blanc Céréales-Gembloux, édition février 2006 "Fumure et protection phytosanitaire des céréales" (2006)

Detailed reference viewed: 11 (4 ULg)
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See detailÉvolution du bilan de masse de surface Antarctique par régionalisation physique et conséquences sur les variations du niveau des mers
Agosta, Cécile ULg

Doctoral thesis (2012)

The Antarctic surface mass balance (SMB, i.e. the snow accumulation from which we sub- tract ablation by sublimation, run-off or erosion) is a major yet poorly known contribution to changes in the present ... [more ▼]

The Antarctic surface mass balance (SMB, i.e. the snow accumulation from which we sub- tract ablation by sublimation, run-off or erosion) is a major yet poorly known contribution to changes in the present-day sea level. Water storage by snow accumulation at the top of the ice- sheet is expected to increase during the 21st century, which would moderate the rise in sea level. Three-quarters of the Antarctic SMB are concentrated below 2000 m above sea level whereas this area represents only 40% of the grounded ice sheet area. Orographic precipitation is a major contributor to snow accumulation in this region, which is why a better estimation of this term is important. The representation of this process by models depends to a great extent on the resolu- tion of the model, since precipitation amounts depend on the ice sheet slopes. Sublimation and snowmelt also depend on elevation. Global and regional atmospheric climate models are unable to achieve a 40-km resolution over Antarctica at a century time scale, due to their computing cost. At this resolution, ice-sheet margins are still badly resolved. <br />That is why we developed the downscaling model SMHiL (surface mass balance high-resolution downscaling), which estimates the Antarctic SMB components at a high resolution (∼15 km) from large-scale atmospheric forcings. We compute the impact of the high-resolution topography on orographic precipitation amounts and on the boundary-layer processes that lead to sublima- tion, melting and refreezing. To validate SMHiL, we compare our results with more than 2700 field data recently updated and quality-controlled. However, we exhibit that field data below 2000 m above sea level are too scarce to settle SMHiL efficiency. In light of this, we show that the GLACIOCLIM-SAMBA stake lines located on the ice sheet coast-to-plateau area is an ap- propriate reference to evaluate model performance. Finally, we downscale the atmospheric global climate model LMDZ4 to estimate the SMB changes during the 21st and 22nd centuries. The high-resolution SMB is significantly different from the SMB given by LMDZ4. Our results sug- gest that running LMDZ4 at a finer resolution may give a future increase in SMB in Antarctica between 15% to 30% higher than at its standard resolution. Future changes in the Antarctic SMB at low elevations will result from the conflict between higher snow accumulation and ru- noff. The downscaling model is a powerful tool that can be applied to climate models for a better assessment of a future rise in sea level. [less ▲]

Detailed reference viewed: 24 (3 ULg)
Peer Reviewed
See detailEvolution du CA 125 et du SCC dans les cancers gynécologiques
Charlier, Corinne ULg; Plomteux, Guy ULg; Lambrichts, M.

in Focus Diagnostica (1992), 1

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See detailEvolution du champ de la Santé mentale en Belgique: de l’asile vers les réseaux et circuits de soins
Thunus, Sophie ULg; Cerfontaine, Gaëtan ULg; Schoenaers, Frédéric ULg

in Observatoire : Revue d'Action Sociale & Médico-Sociale (2012), 72

Detailed reference viewed: 171 (29 ULg)
See detailL'évolution du chlore inorganique au-dessus du Jungfraujoch et le Protocole de Montréal
Mahieu, Emmanuel ULg

Doctoral thesis (2001)

The main objective of this work was to determine the inorganic chlorine budget (Cly) at northern midlatitudes, to establish its variability and to study its temporal evolution over the last fifteen years ... [more ▼]

The main objective of this work was to determine the inorganic chlorine budget (Cly) at northern midlatitudes, to establish its variability and to study its temporal evolution over the last fifteen years. To achieve this, we have analyzed the observational database made of IR solar spectra recorded mainly with high resolution Fourier transform spectrometers installed at the International Scientific Station of the Jungfraujoch, located in the Swiss Alps, at 3580m altitude. The analysis of ATMOS (Atmospheric Trace Molecule Spectroscopy) data allowed us to first establish that HCl and ClONO2 account for more than 93% of the total inorganic chlorine, and that the summation of their vertical column abundances is an excellent surrogate of the Cly evolution at midlatitudes. Thus, we have derived HCl and ClONO2 total column abundance time series above the Jungfraujoch to analyze their temporal evolutions. Their combination has allowed us to show that the Cly increase between 1986 and 1995 (+50%) resulted primarily from the photodissociation of long-lived chlorinated source gas, in particular the manmade chlorofluorocarbons (CFC), progressively transported to the stratosphere after their release at the Earth surface during the seventies and the eighties. The organic chlorine (CCly) decrease in the troposphere resulting from regulations adopted by the Montreal Protocol, its Amendments and Adjustments, led to a progressive stabilization of Cly in the stratosphere. However, statistical analysis and interannual variability characterizing our time series, which extend to the end of 2000, prevent any final determination of the occurrence of the Cly maximum observed here at the end of October 1996, and of its subsequent decrease. We also show that chlorine partitioning among the chlorinated reservoirs has been durably influenced by heterogeneous processes which took place on stratospheric aerosols significantly enhanced following strong volcanic eruption of Mt Pinatubo (Philippines) in June 1991. The above-mentioned topics, complementary findings resulting from the study of the evolution of inorganic fluorine in the stratosphere, as well as comparisons other observational data bases and 2D model predictions are essentially discussed in Chapter 4. Before, Chapter 1 briefly reviews physical and chemical properties of the Earth atmosphere, and processes that control the state and erosion of stratospheric ozone. Individual contributions of chlorinated source gases to the CCly budget and their temporal evolution to the latter, inventory of Cly species, phase out schedule of chemical compounds covered by the Montreal Protocol and its Amendments and Adjustments are given in Chapter 2. Chapter 3 deals with instrumentation and data processing descriptions used to produce the geophysical data sets exploited in the main chapter of this work. [less ▲]

Detailed reference viewed: 55 (0 ULg)
See detailEvolution du Climat et Paléoclimat : effet de serre et CO2
Gérard, Jean-Claude ULg; François, Louis ULg

in Espace et environnement (1995)

Detailed reference viewed: 41 (4 ULg)
Peer Reviewed
See detailL'évolution du comble à la lecture des traités français d'architecture du XVIe au XVIIIe siècle
Gilles, Isabelle ULg

in Hoffsummer, Patrick (Ed.) Les charpentes du XIe au XIe au XIXe siècle: Grand Ouest de la France: typologie et évolution: analyse de la documentation de la Médiathèque de l'architectture et du patrimoine (2011)

Detailed reference viewed: 12 (2 ULg)
See detailL'évolution du commerce de détail à Liège depuis 20 ans
Merenne-Schoumaker, Bernadette ULg; Browet, Anne

in Echevinat des Affaires Economiques et du Commerce (Ed.) Atlas du Commerce de détail de Liège (1994)

Preface of Trade Atlas of Liège with analysis of key developments in trade over the past 20 years

Detailed reference viewed: 69 (4 ULg)
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Peer Reviewed
See detailÉVOLUTION DU COMPORTEMENT DU VENT ET DE SON POTENTIEL POUR LA PRODUCTION D'ÉNERGIE ÉOLIENNE DURANT LES 30 DERNIÈRES ANNÉES : LE CAS DE LA BELGIQUE
Doutreloup, Sébastien ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

in Bigot, Sylvain; Rome, Sandra (Eds.) Les climats régionaux : observation et modélisation. (Actes du colloque organisé à Grenoble du mercredi 5 au samedi 8 septembre 2012) (2012, September)

Chaque année, le nombre d'éoliennes dans le monde augmente de façon significative suite notamment aux politiques encourageant les productions d'énergie verte afin d’atténuer le réchauffement climatique ... [more ▼]

Chaque année, le nombre d'éoliennes dans le monde augmente de façon significative suite notamment aux politiques encourageant les productions d'énergie verte afin d’atténuer le réchauffement climatique. Toutefois, ce type d'énergie est tributaire de la météo. Cela implique que la production d'énergie éolienne est irrégulière à courte échelle de temps. Cependant, la disponibilité d’électricité de courtes périodes de temps est très importante à connaitre pour les producteurs d'énergie ainsi que pour les gestionnaires de réseaux. Pour ces raisons, il nous parait primordial d’analyser l’évolution de l’intermittence de la vitesse du vent sur les 30 dernières années (1979-2009). Pour ce faire nous utilisons le modèle WRF forcé par les réanalyses ERA-Interim, les réanalyses NCEP2 et certains modèles du GIEC (base de données CMIP5). [less ▲]

Detailed reference viewed: 155 (7 ULg)
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See detailL’évolution du concept d’imperium
Stasse, Bauduin ULg

in Entretiens sur l’Antiquité gréco-romaine (2005), 27

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See detailEvolution du conseil de fumure azotée du froment d’hiver
Bodson, Bernard ULg; Herman, Jean-Luc; Vancutsem, Françoise ULg et al

in Livre Blanc: Céréales - Gembloux (2001, February)

Detailed reference viewed: 31 (0 ULg)
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See detailEvolution du conseil de fumure azotée du froment d'hiver
Bodson, Bernard ULg; Maes, N.; Herman, Jean-Luc et al

in Livre Blanc: Céréales - Gembloux (2000, February)

Detailed reference viewed: 26 (1 ULg)
See detailEvolution du couvert vegetal dans la region de Kinshasa (1960-1987) selon une approche cartographique.
Tshibangu, K. W. T.; Engels, Patrick ULg; Malaisse, François ULg

in Geo-Eco-Trop (1997), 21(1-4),

Detailed reference viewed: 36 (9 ULg)
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See detailL'évolution du droit dans le temps et dans l'espace
Gerkens, Jean-François ULg

Scientific conference (2014, October 06)

Detailed reference viewed: 39 (6 ULg)
See detailL’évolution du droit des étrangers
Carlier, Jean-Yves ULg

in Khader, Bichara; Martiniello, Marco; Rea, Andrea (Eds.) et al Penser l’immigration et l’intégration autrement (2006)

Detailed reference viewed: 11 (4 ULg)
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See detailEvolution du fractionnement de la fumure azotée
Bodson, Bernard ULg; Vancutsem, Françoise ULg; Falisse, André

in Livre Blanc: Céréales - Gembloux (2002, February 27)

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See detailEvolution du fractionnement de la fumure azotée
Bodson, Bernard ULg; Vancutsem, Françoise ULg; Destain, Jean-Pierre ULg et al

in Fumure et protection phytosanitaire des céréales (2003, February 19)

Detailed reference viewed: 19 (6 ULg)
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See detailEvolution du graissage
Hanocq, Charles ULg; De Meulemeester, Désiré; Leloup, Lucien et al

in Congrès 1947 : Section mécanique : Centenaire de l'Association des Ingénieurs sortis de l'Ecole de Liège (A. I. Lg.) (1947)

Detailed reference viewed: 5 (0 ULg)