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Peer Reviewed
See detailI cannóni del cànone salgariano
Curreri, Luciano ULg

in Il ciclo del Corsaro Nero. Il Corsaro Nero, La regina dei Caraibi, Jolanda, la figlia del Corsaro Nero (2011)

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See detailCannulation of bovine fetuses for a long period blood collection: the chirurgical approach
Touati, Kamal ULg; Melo de Sousa, Noelita ULg; Van der Weijden, G. C. et al

in Proceedings: 24th World Buiatrics Congress (2006)

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See detailCannulation of the cardiac lymphatic system in swine.
Vazquez-Jimenez, J. F.; SEGHAYE, Marie-Christine ULg; Qing, M. et al

in European Journal of Cardio - Thoracic Surgery (2000), 18(2), 228-32

OBJECTIVE: Cardiac lymph is the most direct medium for analyzing metabological changes in the myocardial cell. Currently, dogs are the animals used for investigation of myocardial lymphatic function ... [more ▼]

OBJECTIVE: Cardiac lymph is the most direct medium for analyzing metabological changes in the myocardial cell. Currently, dogs are the animals used for investigation of myocardial lymphatic function. However, questions arise when comparing and interpreting the human system to the experimental model, since the dog coronary anatomy is different from human anatomy and pulmonary lymph contamination is found in up to 81% of the cases. Swine, having similar coronary anatomy to humans, are a proven model for cardiovascular research. The purpose of this study was to investigate the cardiac lymphatic anatomy of the swine and to develop a reliable cannulation technique to collect the lymph. METHODS AND RESULTS: The lymphatic anatomy of 60 pigs was studied and classified and a new technique for lymphatic cannulation was developed. The cannulation success rate was 55%. In addition, no pulmonary lymph contamination was found at the cannulation site. CONCLUSION: We conclude that porcine myocardial lymphatics can be successfully cannulated for the investigation of myocardial lymphatic function. [less ▲]

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See detailLe canon littéraire au crible des Physiologies
Stienon, Valérie ULg

in Revue d'Histoire Littéraire de la France (2014), 1

Gustave Lanson considérait les productions mineures comme le tissu conjonctif de l’histoire littéraire. Un tel point de vue peut rapidement faire apparaître les Physiologies parisiennes des années 1830 ... [more ▼]

Gustave Lanson considérait les productions mineures comme le tissu conjonctif de l’histoire littéraire. Un tel point de vue peut rapidement faire apparaître les Physiologies parisiennes des années 1830-1845 comme le laboratoire de bien des esthétiques modernes, ce corpus étant d’autant plus inventif qu’il procède pour une grande part des poétiques d’écriture hybrides et expansives de la presse. Parce qu'elles sont enclines à traiter du personnel, des lieux et des pratiques littéraires à partir d'une fraction symboliquement réprouvée, sinon marginale, de la production littéraire, les Physiologies peuvent assumer tout à la fois une fonction de régulation et de révélation des processus de légitimation. L'article met en évidence ce double rôle d'élucidation et d'observation participante manifestée par ces textes. [less ▲]

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See detailCanonical framework for describing suboptimum methods for radar STAP
De Grève, Sébastien; Lapierre, Fabian D.; Verly, Jacques ULg

Conference (2004)

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See detailCanonical framework for describing suboptimum methods for radar STAP
De Grève, Sébastien; Lapierre, Fabian D.; Verly, Jacques ULg

Conference (2005)

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See detailCanonical framework for describing suboptimum radar space-time adaptive processing (STAP) techniques
De Grève, Sébastien; Lapierre, Fabian D.; Verly, Jacques ULg

Conference (2004)

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See detailCanonical variables of aquatic bryophyte combinations for predicting water trophic level
Vanderpoorten, Alain ULg; Palm, R.

in Hydrobiologia (1998), 386(1-3), 85-93

A method for predicting water quality by linear regression using aquatic bryophy te canonical variables as predictors is presented. An example of application in the Alsatian Rhine valley is developed. The ... [more ▼]

A method for predicting water quality by linear regression using aquatic bryophy te canonical variables as predictors is presented. An example of application in the Alsatian Rhine valley is developed. The /--squared obtained before and after cross-validation reached 0.68 and 0.58 for the standard deviation of temperatures, 0.55 and 0.46 for the logarithm of the mean concentrations of N-NH4+, 0.52 and 0.43 for the logarithm of the mean concentrations of N-NO3- and 0.38 and 0.31 for the logarithm of the mean concentrations of P-PO43-. Higher r-squared were not expected due to the broad physico-chemical ranges and the low diversity of genuine aquatic bryophytes. The predicted values of the mean concentrations of N-NH4+, P-PO43- and of the standard deviation of temperatures were often greater than the measured ones. The aquatic bryophytes integrate the sudden increase of the trophic level in oligotrophic streams during the floods of the main eutrophic river and testify to a higher trophic level than expected from regular physico-chemical analyses outside the flood period. Aquatic bryophytes are also affected by water quality in the long term and indicate pollutants other than those measured in current water quality. Other factors besides trophic level might influence the aquatic bryophyte assemblages and should be monitored in order to find the precise relationships between water quality and aquatic macrophytes and in order to create a more accurate model of the effects of the flooding of disconnected streams by the Rhine waters (currently in progress in the Upper Rhine) on the aquatic macrophyte assemblages. [less ▲]

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See detailCanopy gap edge determination and the importance of edges for plant diversity.
Salvador-Van Eysenrode, D; Kockelbergh, F; Bogaert, Jan ULg et al

in The European dimension in ecology, perspectives and challenges for the 21th century (.). (1999)

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See detailCanopy gap edge determination and the importance of gap edges for plant diversity
Salvador-Van Eysenrode, D; Kockelbergh, F; Bogaert, Jan ULg et al

in Web Ecology (2002), 3

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See detailCanopy Gap Mapping from Airborne Laser Scanning: An Assessment of the Positional and Geometrical Accuracy
Bonnet, Stéphanie ULg; Gaulton, Rachel; Lehaire, François et al

in Remote Sensing (2015), 7

Canopy gaps are small-scale openings in forest canopies which offer suitable micro-climatic conditions for tree regeneration. Field mapping of gaps is complex and time-consuming. Several studies have used ... [more ▼]

Canopy gaps are small-scale openings in forest canopies which offer suitable micro-climatic conditions for tree regeneration. Field mapping of gaps is complex and time-consuming. Several studies have used Canopy Height Models (CHM) derived from airborne laser scanning (ALS) to delineate gaps but limited accuracy assessment has been carried out, especially regarding the gap geometry. In this study, we investigate three mapping methods based on raster layers produced from ALS leaf-off and leaf-on datasets: thresholding, per-pixel and per-object supervised classifications with Random Forest. In addition to the CHM, other metrics related to the canopy porosity are tested. The gap detection is good, with a global accuracy up to 82% and consumer’s accuracy often exceeding 90%. The Geometric Accuracy (GAc) was analyzed with the gap area, main orientation, gap shape-complexity index and a quantitative assessment index of the matching with reference gaps polygons. The GAc assessment shows difficulties in identifying a method which properly delineates gaps. The performance of CHM-based thresholding was exceeded by that of other methods, especially thresholding of canopy porosity rasters and the per-pixel supervised classification. Beyond assessing the methods performance, we argue the critical need for future ALS-based gap studies to consider the geometric accuracy of results. [less ▲]

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See detailCanopy gap morphology determinants in an Amazonian rain forest.
Salvador-Van Eysenrode, D; Bogaert, Jan ULg; Impens, I

in Selbyana (1999), 20(2), 339-344

Detailed reference viewed: 14 (1 ULg)
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See detailCanopy perforation in Amazonian Ecuador.
Salvador-Van Eysenrode, D; Bogaert, Jan ULg; Van Hecke, P et al

in Coenoses (1999), 14(1-3), 13-21

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See detailCanopy proximity estimation and impact on long term turbulent fluxes above a heterogeneous forest
Hurdebise, Quentin ULg; Vincke, Caroline; De Ligne, Anne ULg et al

Poster (2016, April 18)

With the development of eddy covariance networks like Fluxnet, ICOS or NEON, long-term data series of carbon dioxide, water vapor and other gas exchanges between terrestrial ecosystems and atmosphere will ... [more ▼]

With the development of eddy covariance networks like Fluxnet, ICOS or NEON, long-term data series of carbon dioxide, water vapor and other gas exchanges between terrestrial ecosystems and atmosphere will become more and more numerous. However, long-term analyses of such exchanges require a good understanding of measurement conditions during the investigated period. Independently of climate drivers, measurements may indeed be influenced by measurement conditions themselves subjected to long-term variability due to vegetation growth or set-up changes. The present research refers to the Vielsalm Terrestrial Observatory (VTO) where fluxes of momentum, carbon dioxide, latent and sensible heat have been continuously measured by eddy covariance during twenty years. VTO is an ICOS site installed in a mixed forest (beech, silver fir, Douglas fir, Norway spruce) in the Belgian Ardennes. A multidisciplinary approach was developed in order to investigate the spatial and temporal evolution of several site characteristics: - displacement height (d) and relative measurement height (z-d) were determined using a spectral approach that compared observed and theoretical cospectra; - turbulence statistics were analyzed in the context of Monin-Obukhov similarity theory; - tree height during the measurement period was obtained by combining tree height inventories, a LIDAR survey and tree growth models; - measurement footprint was determined by using a footprint model. A good agreement was found between the three first approaches. Results show notably that z-d was subjected to both temporal and spatial evolution. Temporal evolution resulted from continuous tree growth as well as from a tower raise, achieved in 2009. Spatial evolution, due to canopy heterogeneity, was also observed. The impacts of these changes on measurements are investigated. In particular, it was shown that they affect measurement footprint, flux spectral corrections and flux quality. All these effects must be taken into consideration in order to disentangle long-term flux evolutions due to climate or phenology from changes resulting from measurement set-up changes. [less ▲]

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See detail'Canopy-atmosphere interaction in forests: a key process in nutrient cycling and pollution interception
Carnol, Monique ULg; Guillaume, Patricia

Conference (2006, October 17)

An efficient way for assessing the nutrient status of an ecosystem is the establishment of nutrient input-output mass balance budgets at the catchment scale. For example, outputs (i.e. losses in ... [more ▼]

An efficient way for assessing the nutrient status of an ecosystem is the establishment of nutrient input-output mass balance budgets at the catchment scale. For example, outputs (i.e. losses in streamwater, through havesting etc.) greater than inputs (i.e. weathering, dry and wet deposition, fertiliser) indicate that a depletion of the given element is taking place. In forest ecosystems, element input via throughfall is an important pathway in nutrient cycling. Precipitation interacts with the stand canopy, resulting in increased/decreased solute inputs to the forest floor. For example, acid deposition (H, N) may be substantially increased through the filtering action of the tree canopy. Indeed, canopy throughfall chemical composition includes wet deposition (rainfall), dry deposition intercepted by the canopy and elements leached from the foliar tissue (canopy leaching). Moreover, interactions between canopy and atmosphere or precipitation depend on several factors such as: season, tree species and physiology, stand structure and health. However, canopy leaching results from an internal nutrient cycling process. Ignoring this component in throughfall measurements thus leads to an overestimation of the inputs to the ecosystem. In this paper, main results of studies performed in the Belgian Ardennes at the watershed (80 ha) and plot scale are summarised. The aim of this research was to quantify long-term nutrient budgets in a forested watershed, within a context of sustainable management. In this area, soils are naturally acidic and poor in magnesium, so that forest dieback symptoms reported from 1983 onwards were related to increased pollution exacerbating magnesium deficiency. There is concern that acid (S and N) deposition, together with sylvicultural management (harvesting, spruce monocultures etc.) could deplete the available cation pool and that soils would not be able to support intensive sylviculture on the long term. We measured concentrations and fluxes of major ions in bulk deposition, throughfall and stream water over 13 years. Throughfall deposition under coniferous (Picea abies (L.) Karst.) and several deciduous tree species was also compared. A canopy budget method was used for distinguishing between external (dry deposition) and internal (canopy leaching) sources of ions in the throughfall flux. The contribution of canopy leaching in throughfall measurements and consequences for mass balance calculations will be discussed. Furthermore, nutrient fluxes through the ecosystem will be examined with regard to the long term nutrient status of the system. [less ▲]

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See detailCanopy-atmosphere interaction in forests: a key process in nutrient cycling and pollution interception
Carnol, Monique ULg; Guillaume, Patricia ULg

in Book of Abstracts, SCK-CEN-BLG-1032, Topical day on: Biogeochemical response of forest vegetation to chronic pollution: processes, dynamics and modelling (2006)

Detailed reference viewed: 18 (1 ULg)