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See detailLes possibilités d’utilisation du matériel GPS en forêt
Lejeune, Philippe ULg

Learning material (2001)

Introduction Le matériel GPS a fait une percée très remarquée dans de nombreuses applications civiles au cours des cinq dernières années (transports, génie civil, topographie, randonnée, …). La gestion ... [more ▼]

Introduction Le matériel GPS a fait une percée très remarquée dans de nombreuses applications civiles au cours des cinq dernières années (transports, génie civil, topographie, randonnée, …). La gestion forestière, pour laquelle la dimension spatiale joue un rôle important, n’échappe pas à la règle et les possibilités d’application de cette nouvelle technologie y sont multiples. Le présent document a pour objectif d'expliquer les grands principes de fonctionnement des récepteurs GPS et de présenter les possibilités d'utilisation de ces appareils en forêt. L’accent est mis sur les niveaux de précision à espérer en fonction des conditions d’utilisation. Le type d’appareil considéré dans ce document est celui des récepteurs de bas de gamme (GPS dits de "randonnée"), dont le prix d'achat varie entre 250 et 500 €. Ce choix délibéré est lié non seulement au coût abordable de cette gamme d’appareils, mais également à sa simplicité de mise en oeuvre. [less ▲]

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See detailPossibilités de revitalisation des arbres urbains
M'hamdi, Mohamed El Wafi ULg; EYLETTERS, Murielle; Paul, Roger ULg

Conference given outside the academic context (2003)

In our cities, trees must face many root stress. The most current are: •The chronic drought, bound to the narrowness of the plantation holes, to the packing of soil, to the asphalt cover of the ... [more ▼]

In our cities, trees must face many root stress. The most current are: •The chronic drought, bound to the narrowness of the plantation holes, to the packing of soil, to the asphalt cover of the surroundings ; •The asphyxic conditions, due to the same reasons ; •The chemical factors: inadequate pH, high salinity, deficiencies in nutrient elements, toxicity of others…; •The human aggressions: vandalism, injuries due to public works,… In spite of the diversity of the reasons, several morpho-physiological consequences are similar, notably on the depression of mineral nutrition and of water balance. Consequently, the proposed are aimed at the remediation of these effects. They are based on the correction of mineral deficiencies by injections of nutrient solutions, on the improvement of the biologic fertility by mycorrhiza inoculations, or on the aeration of soil structure. Some technics combine these different treatments. [less ▲]

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See detailPossibilités de valorisation de nos recherches sur les dermatophytoses
Mignon, Bernard ULg

Scientific conference (2002)

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See detailPossibilités et limites des nez électroniques pour la mesure des odeurs.
Nicolas, Jacques ULg; Delva, Julien

Conference (2012, March 15)

The communication aimed at presenting the potential of electronic noses to monitor environmental odours. The advantages and the limits of the concept were presented together with the point of view of a ... [more ▼]

The communication aimed at presenting the potential of electronic noses to monitor environmental odours. The advantages and the limits of the concept were presented together with the point of view of a company specialized in odour measurement. [less ▲]

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See detailPossibilités offertes par l'enrobage des semences
Schiffers, Bruno ULg; Copin, A.

in Semaine de la Technologie - Hortitec'94 (1994, March 24)

Innover dans la technologie des formulations pour une application des pesticides plus respectueuse de l'environnement.

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See detailPossibilités récentes de la spectrométrie de fluorescence-X dans le domaine de l'environnement
Marcoen, Jean Marie ULg; Engels, Patrick ULg; Naud, J.

in Bulletins de Recherches Agronomiques Gembloux (1991)

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See detailPossibilities and limitations of the Prevost model for the modelling of cohesionless soil cyclic behaviour
Cerfontaine, Benjamin ULg; Charlier, Robert ULg; Collin, Frédéric ULg

in Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering (2013)

The Prevost’s model is currently used to model cyclic behaviour of soils especially in earthquake engineering. The original model is able to capture the main features of cyclic behaviour: pore pressure ... [more ▼]

The Prevost’s model is currently used to model cyclic behaviour of soils especially in earthquake engineering. The original model is able to capture the main features of cyclic behaviour: pore pressure build up and plastic deformation accumulation. But accurate modelling of laboratory tests requires improvements. Enhanced models exist but require a lot of parameters that make them cumbersome for practical purpose. A suction caisson, part of a tripod offshore foundation for wind turbines is modelled. Possibilities of the Prevost’s model are highlighted compared with a classical Drucker-prager model. [less ▲]

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See detailPossibilities and limits of application of electrical resistance tomography in hydrodynamics of bubble columns
Toye, Dominique ULg; Fransolet, E.; Simon, Daniel ULg et al

in Canadian Journal of Chemical Engineering (2005), 83(1), 4-10

Knowing the hydrodynamic regime in which is working a bubble column is of great importance because the regime affects strongly the mass transfer between the phases. To this end, we examine the ... [more ▼]

Knowing the hydrodynamic regime in which is working a bubble column is of great importance because the regime affects strongly the mass transfer between the phases. To this end, we examine the potentialities of an Electrical Resistance Tomography (ERT) device. We analyse cross correlation of electrode pair measurements, of neighbouring pixels and power spectra of averaged pixels within a single plane as well as cross correlations of averaged pixels between two planes, without finding a clear signature of the churn turbulent flow. Variable gas flow rate inputs are used to determine the time resolution of the ERT. [less ▲]

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See detailPossibilities for rutile extraction from Norwegian eclogite by flotation
Gaydardzhiev, Stoyan ULg; Sandvik, Knut

Scientific conference (1993)

Preliminary flotations tests towards rutile extraction from Norwegian eclogites (Verving deposit) have been carried out. Various sulfonate type flotation reagents (produced by Hoechts) have been tested ... [more ▼]

Preliminary flotations tests towards rutile extraction from Norwegian eclogites (Verving deposit) have been carried out. Various sulfonate type flotation reagents (produced by Hoechts) have been tested. Selectivity between rutile/pyroxene has been targeted. Rutile separation from pyrite and garnet has been further identified as principal problem. [less ▲]

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See detailPossibilities of astronomical spectroscopy in the infrared
Swings, Polydore ULg

in Publications of the Astronomical Society of the Pacific [=PASP] (1944), 56

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See detailPossibility of Fluorescence Phenomena in the Ultraviolet Spectrum of Symbiotic Stars and Long Period Variables
Swings, Jean-Pierre ULg; Swings, Polydore ULg

in Houziaux, Léo; Butler, H. E. (Eds.) Ultraviolet Stellar Spectra and Related Ground-Based Observations : IAU symposium, held in Lunteren, The Netherlands, 24-27 June, 1969 (1970)

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See detailThe possible appearance of a second period in the WN 5 star EZ Canis Majoris
Gosset, Eric ULg; Vreux, Jean-Marie ULg

in Astronomy and Astrophysics (1987), 178

Previously published photometric data on EZ Canis Majoris are reanalyzed. It is shown by different techniques that a sine-wave type periodicity close to one third of the claimed period of P = 3[SUP]d[/SUP ... [more ▼]

Previously published photometric data on EZ Canis Majoris are reanalyzed. It is shown by different techniques that a sine-wave type periodicity close to one third of the claimed period of P = 3[SUP]d[/SUP].766 may also be present in what was considered as peculiarities in the lightcurve. The data available do not allow to known if this second period is precisely equal or only close to one third of P nor if there is some dependence between the two. In any case, the mere possible existence of such a second period is an interesting fact in the discussion concerning the possible existence of non-radial pulsations in some WR stars. [less ▲]

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See detailA possible auroral signature of a magnetotail reconnection process on Jupiter
Grodent, Denis ULg; Gérard, Jean-Claude ULg; Clarke, J. T. et al

in Journal of Geophysical Research. Space Physics (2004), 109(A5),

[1] Several theoretical models and in situ observations consistently suggest that the process of nightside reconnection associated with Earth's magnetospheric substorms is also taking place in the ... [more ▼]

[1] Several theoretical models and in situ observations consistently suggest that the process of nightside reconnection associated with Earth's magnetospheric substorms is also taking place in the midnight tail region of Jupiter. We report the observation of a new auroral feature which takes the form of isolated spots appearing near the northern dusk-midnight limb, poleward of the main auroral oval. This feature was clearly detected in three HST-STIS data sets obtained on 14, 16, and 18 December 2000. Its position poleward of the main auroral oval, and lagging corotation, shows that it is magnetically connected to a distant region of the nightside magnetosphere. It is therefore suggested that these transient spots are the auroral signatures of reconnection processes occurring in the nightside tail of the distant Jovian magnetosphere. The cause of this reconnection is somewhat analogous to the case of a solar coronal mass ejection, so one may refer to it as a "Jovian mass ejection.'' [less ▲]

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See detailThe possible biperiodicity of WR 40
Gosset, Eric ULg; Vreux, Jean-Marie ULg

in Astronomy and Astrophysics (1990), 231

Strong arguments are presented in favor of the simultaneous presence of two periodicities in the variability of the Wolf-Rayet star WR 40. The frequencies are nu(A) = 0.16/d and nu(B) = 0.40/d. Some ... [more ▼]

Strong arguments are presented in favor of the simultaneous presence of two periodicities in the variability of the Wolf-Rayet star WR 40. The frequencies are nu(A) = 0.16/d and nu(B) = 0.40/d. Some uncertainties remain concerning the choice of the actual one-year alias. On the basis of a detailed statistical analysis, reliable evidence that the variability related to nu(B) could be coherent is also presented: this points out nu(B) as a possible fundamental frequency linked to the 'core' of WR 40. No firm conclusion could be drawn about nu(A), suggesting that it could be a recurrent quasi-periodicity or a second order periodicity (e.g., a beat frequency). The two frequencies are sometimes hidden by the white noise, or slightly correlated, random process that constitutes the third component of the variability of WR 40. [less ▲]

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See detailPOSSIBLE COMPOSITION AND CLIMATIC CHANGES DUE TO PAST INTENSE ENERGETIC PARTICLE-PRECIPITATION
Hauglustaine, Didier A.; Gérard, Jean-Claude ULg

in Annales Geophysicae [= ANGEO] (1990), 8(2), 87-96

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See detailPossible Contributions of Jatropha curcas L. to Rural Poverty Alleviation in Senegal : Vision and facts
Savery, S.; Toussaint, André; Defrise, L. et al

in Tropicultura (2008), 26(2), 125-126

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See detailPossible Contributions of Jatropha curcas L. to Rural Poverty Alleviation in Senegal: Vision and Facts
Saverys, S.; Toussaint, André ULg; Defrise, L. et al

in Tropicultura (2008), 26(2), 125-126

Detailed reference viewed: 10 (7 ULg)