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Peer Reviewed
See detailInfluence of frugivore taxa on the generation of plant recruitment foci and on the composition of plant recruits’ communities
Trolliet, Franck ULg; Forget, Pierre-Michel; Doucet, Jean-Louis ULg et al

Conference (2016, June 20)

Frugivores can disperse seeds in a spatially contagious pattern and generate recruitment foci (e.g. under fruiting trees). This process is increasingly explored to understand the influence of frugivores ... [more ▼]

Frugivores can disperse seeds in a spatially contagious pattern and generate recruitment foci (e.g. under fruiting trees). This process is increasingly explored to understand the influence of frugivores on the spatial organization of plant communities, and can also serve as a method to efficiently monitor the consequences of animal extirpation. However, there is limited evidence contrasting the influence of different frugivores taxa on the creation of recruitment foci under fruiting trees, and, similarly, on the overall composition of plant communities. Here, we aimed (i) to compare the role of hornbills and primates in creating recruitment foci, and (ii) to investigate how the presence of hornbills, primates and elephants influence the overall composition of plant recruit’s community in an anthropized forest-savanna mosaic in DR Congo. We firstly compared the community of recruits (0.5-2 m high) in 25-m² plots below hornbill-dispersed trees (Staudtia kamerunensis, N=32), primate-dispersed trees (Dialium spp., N=26), and in control plots located below other tree species (N= 4900 m²). Secondly, we considered all plots to compare the community of recruits in five sites characterized by contrasted levels of hunting and housing different seed disperser communities. Our preliminary results indicate (i) communities of recruits below hornbill-dispersed trees are significantly more dense and richer than in control plots, unlike these below primate-dispersed trees. Also, (ii) recruits in sites less affected by hunting, housing more large frugivores, including elephants, tend to belong to species with longer seeds. We conclude that hornbills generate recruitment foci under fruiting trees, which can serve as an efficient tool to monitor the ecological consequences of their extirpation. Moreover, we discuss the potential influence of the different studied frugivore taxa and the risk of their extirpation from afro-tropical forests on the composition of plant recruits’ community. [less ▲]

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See detailInfluence of fuel type, dilution and equivalence ratio on the emission reduction from the auto-ignition in an Homogeneous Charge Compression Ignition engine
Machrafi, Hatim ULg; Cavadias, Simeon; Amouroux, Jacques

in Energy (2010), 35(4), 1829-1838

One technology that seems to be promising for automobile pollution reduction is the Homogeneous Charge Compression Ignition (HCCI). This technology still faces auto-ignition and emission-control problems ... [more ▼]

One technology that seems to be promising for automobile pollution reduction is the Homogeneous Charge Compression Ignition (HCCI). This technology still faces auto-ignition and emission-control problems. This paper focuses on the emission problem, since it is incumbent to realize engines that pollute less. For this purpose, this paper presents results concerning the measurement of the emissions of CO, NOx, CO2, O-2 and hydrocarbons. HCCI conditions are used, with equivalence ratios between 0.26 and 0.54, inlet temperatures of 70 degrees C and 120 degrees C and compression ratios of 10.2 and 13.5, with different fuel types: gasoline, gasoline surrogate, diesel, diesel surrogate and mixtures of n-heptane/toluene. The effect of dilution is considered for gasoline, while the effect of the equivalence ratio is considered for all the fuels. No significant amount of NOx has been measured. It appeared that the CO, O-2 and hydrocarbon emissions were reduced by decreasing the toluene content of the fuel and by decreasing the dilution. The opposite holds for CO2. The reduction of the hydrocarbon emission appears to compete with the reduction of the CO2 emission. Diesel seemed to produce less CO and hydrocarbons than gasoline when auto-ignited. An example of emission reduction control is presented in this paper. (C) 2010 Elsevier Ltd. All rights reserved. [less ▲]

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See detailInfluence of game playing on the muscular profile of shoulder rotators of handball players
Ucay, O.; Gasq, D.; Forthomme, Bénédicte ULg et al

in European Journal of Sports Medicine (2013, September), 1(1), 105

Detailed reference viewed: 31 (3 ULg)
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See detailInfluence of Garlic Intercropping or Active Emitted Volatiles in Releasers on Aphid and Related Beneficial in Wheat Fields in China
Haibo, Zhou; Chen, Julian; Yong, Liu et al

in Journal of Integrative Agriculture (2013), 12(3)

Detailed reference viewed: 42 (7 ULg)
Peer Reviewed
See detailThe influence of gas depth on interfacial convection in a liquid gas bilayer.
Narayanan, Ranga; Theisen, Eric; Johnson, Duane et al

in Bulletin of the American Physical Society, Proceedings of the 54th Annual Meeting of the APS Division of Fluid Dynamics (2001, November 01)

We present a study of the influence of air height on the pattern formation at the onset of interfacial convection in a liquid -gas bilayer. Bilayer convection results from interaction of two immiscible ... [more ▼]

We present a study of the influence of air height on the pattern formation at the onset of interfacial convection in a liquid -gas bilayer. Bilayer convection results from interaction of two immiscible, superposed fluid layers and it is a transport problem that is affected by the ratios of various thermophysical properties and geometries. By using both calculations and experiments, a new convection-coupling mechanism is revealed. When the gas depth is low the convection is dominant in the liquid. It is of the Rayleigh Marangoni type and subcritical convection may be seen for axisymmetric patterns at the onset. For large gas heights the convection in the upper fluid layer simultaneously generates transverse thermal gradients along the fluid-fluid interface immediately causing surface tension gradient and buoyancy driven-convection in the lower fluid. The convection in the gas is of the Rayleigh type and the self-adjoint nature of the mathematical problem is depicted in the experiment wherein no subcritical motion occurs. In both the calculations and the experiment, silicone oil and air were used as the two fluids. As the viscosity of air is quite low compared to the silicone oil, convection in the air has no mechanical influence on the silicone oil and it is this property that is advantageous in isolating the new convection mechanism. The correspondence between theory and experiment is excellent. [less ▲]

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See detailInfluence of gas species on backdraft probability using a diffusion flame limits criterion
Pérez Jiménez, Christian; Franssen, Jean-Marc ULg; Karlsson, Bjorn

in Journal of Fire Sciences (2009), 27(2), 143-156

Backdraft is a limited-ventilation fire phenomenon closely linked to the unburnt gases accumulated in the fire compartment just before creating an opening that allows a new supply of oxygen to enter the ... [more ▼]

Backdraft is a limited-ventilation fire phenomenon closely linked to the unburnt gases accumulated in the fire compartment just before creating an opening that allows a new supply of oxygen to enter the compartment. The aim of this article is to help understanding the influence of gas species such as hydrocarbon CmHn, water, carbon dioxide, oxygen, and nitrogen on backdraft probability. The influence of increasing the number of moles of the above gas species as well as the number of atoms of carbon, hydrogen, and oxygen in the fuel composition is analyzed. For this purpose, a diffusion flame limit criterion based on Le Chatelier's rule is used. In order to verify the obtained results, validation with 41 backdraft experiments is carried out. [less ▲]

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See detailInfluence of Gaussian beams on the reconstruction of digital Fourier holograms
Roose, Stéphane ULg; Stijns, Erik

Scientific conference (1989, June 01)

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See detailInfluence of gaze direction on face recognition: A sensitive effect
Daury, Noémy ULg

in Psychologica Belgica (2011), 51(2), 139-153

This study was aimed at determining the conditions in which eye-contact may improve recognition memory for faces. Different stimuli and procedures were tested in four experiments. The effect of gaze ... [more ▼]

This study was aimed at determining the conditions in which eye-contact may improve recognition memory for faces. Different stimuli and procedures were tested in four experiments. The effect of gaze direction on memory was found when a simple “yes-no” recognition task was used but not when the recognition task was more complex (e.g. including “Remember-Know” judgements, cf. Experiment 2, or confidence ratings, cf. Experiment 4). Moreover, even when a “yes-no” recognition paradigm was used, the effect occurred with one series of stimuli (cf. Experiment 1) but not with another one (cf. Experiment3). The difficulty to produce the positive effect of gaze direction on memory is discussed. [less ▲]

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See detailInfluence of gender and season on reduced glutathione concentration and energy reserves of Gammarus roeseli
Gismondi, Eric ULg; Beisel, Jean-Nicolas; Cossu-Leguille, Carole

in Environmental Research (2012), 118

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See detailInfluence of gender on diagnostic accuracy of rapid atrial and ventricular pacing stress echocardiography for the detection of coronary artery disease: a multicenter study (Pol-RAPSE final results).
Plonska-Gosciniak, Edyta; LANCELLOTTI, Patrizio ULg; Kleinrok, Andrzej et al

in Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography (2008), 21(10), 1116-20

BACKGROUND: Rapid cardiac pacing using a permanent pacemaker may be used as a nonpharmacologic stress during echocardiographic imaging for diagnosing coronary artery disease (CAD). We presented the final ... [more ▼]

BACKGROUND: Rapid cardiac pacing using a permanent pacemaker may be used as a nonpharmacologic stress during echocardiographic imaging for diagnosing coronary artery disease (CAD). We presented the final results of a national multicenter study, the Polish study on Rapid Pacing Stress Echocardiography (Pol-RAPSE), aimed at the assessment of the safety and accuracy of rapid cardiac pacing for the noninvasive diagnosis of CAD in women and men. METHODS: We have analyzed 149 tests performed in 100 patients with permanent pacemakers (27% ventricular pacing [VVI], 10% atrial pacing [AAI], 63% dual chamber pacing [DDD]) referred for stress echocardiography. All patients underwent coronary angiography as a reference for assessing the accuracy of rapid cardiac pacing stress echocardiography (RAPSE). Significant CAD was defined as luminal diameter reduction more than 50% in at least 1 major epicardial coronary artery. RESULTS: Peak stress was obtained in 73 patients using physiologic stimulation of right atrium by and mode or in 76 patients by VVI mode. Significant CAD was detected by angiography in 46% of women and 57% of men (P = not significant). The feasibility of the test was 98%. Overall accuracy of the test was slightly lower in women than in men (75% vs 88%, P = .04), although there were no significant differences in sensitivity, specificity, and positive and negative predictive values between the genders. In women (n = 48), the accuracy of RAPSE performed in AAI and VVI mode was 79% and 70% with no significant difference and in men was 89% and 87%, respectively (P = not significant). CONCLUSION: RAPSE is a safe and feasible modality for diagnosing CAD. The method offers slightly higher accuracy in men compared with women. Overall efficacy is satisfactory with both AAI and VVI pacing, although easier interpretation of peak AAI/DDD images results in a trend toward better accuracy. [less ▲]

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See detailThe influence of genetic selection on the milk fatty acid profile of spring calving dairy cows
McParland, Sinead; Berry, Donagh; Coleman, J. et al

in Proceedings of the British Society of Animal Science and the Agricultural Research Forum (2010)

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See detailThe influence of genetic selection on the milk fatty acid profile of spring calving dairy cows
Mc Parland, Sinead; Berry, Donagh; Coleman, J. et al

Poster (2010, April)

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See detailInfluence of geometry in the case of relative positioning with GNSS
Wautelet, Gilles ULg; Lejeune, Sandrine; Lonchay, Matthieu ULg et al

Poster (2009, November 18)

Relative positioning with GNSS is generally used to achieve precise positions in the frame of critical applications (surveying, photo-control...). On this basis, we have developed a software which allows ... [more ▼]

Relative positioning with GNSS is generally used to achieve precise positions in the frame of critical applications (surveying, photo-control...). On this basis, we have developed a software which allows to compute a positioning error due to the ionosphere only using reference stations belonging to the Belgian Dense Network (BDN). This network consists in 66 GPS (dual-frequency) receivers over the whole Belgium. The drawback of this method is that this computation needs the design matrix which contains coefficients depending on satellite constellation geometry. Therefore, like for absolute positioning, a poor geometry (evaluated by the Dilution of Precision, or DOP) can also lead to large positioning error that cannot be separated from the one due to ionospheric effects, and in particular the small-scale structures. The main goal of this paper is to build a similar index to DOP for relative positioning in our software to be able to separate the ionospheric effects from the geometric ones. The final step is to study the feasability of a service for users of relative positioning using the BDN. The objective is to give in post-processing the positioning accuracy degradation for all BDN baselines and to associate a colour scheme to the different degradation classes created. [less ▲]

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See detailInfluence of giant kelp beds (Macrocystis pyrifera) on diel cycles of pCO2 and DIC in the Sub-Antarctic coastal area
Delille, Bruno ULg; Borges, Alberto ULg; Delille, Daniel

in Estuarine Coastal & Shelf Science (2009), 81

The partial pressure of CO2 (pCO2) and dissolved inorganic carbon (DIC) were monitored in shallow coastal waters located inside and outside giant kelp beds (Macrocystis pyrifera) located in the Kerguelen ... [more ▼]

The partial pressure of CO2 (pCO2) and dissolved inorganic carbon (DIC) were monitored in shallow coastal waters located inside and outside giant kelp beds (Macrocystis pyrifera) located in the Kerguelen Archipelago (Southern Ocean). Photosynthesis and respiration by microplankton and kelp lead to marked pCO2 and DIC diel cycles. Daily variations of pCO2 and DIC are significant in the spring and summer, but absent in the winter, reflecting the seasonal cycle of biological activity in the kelp beds. If the kelp beds seem to favour the onset of phytoplankton blooms, most of the primary production inside the kelp beds is due to the kelp itself. The primary production of Macrocystis kelp beds in the Sub-Antarctic high-nutrient, low-chlorophyll (HNLC) waters off the Kerguelen Archipelago is elevated and closely linked to light availability. This production is significant from October to March and reaches its climax in December at the solar radiation maximum. [less ▲]

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See detailInfluence of grain boundaries on the COads monolayer oxidation and oxygen reduction reaction kinetics
Asset, Tristan ULg; Chattot, Raphaël; Nelayah, Jaysen et al

Conference (2016, September 12)

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See detailThe influence of grain shape, friction and cohesion on granular compaction dynamics
Vandewalle, Nicolas ULg; Lumay, Geoffroy ULg; Gerasimov, O. et al

in European Physical Journal E -- Soft Matter (2007), 22(3), 241-248

This article is a review of our recent and new experimental works on granular compaction. The effects of various microscopic parameters on the compaction dynamics are addressed, in particular the ... [more ▼]

This article is a review of our recent and new experimental works on granular compaction. The effects of various microscopic parameters on the compaction dynamics are addressed, in particular the influence of the grain shape, the friction and the cohesion between the grains. Two dimensional and three dimensional systems are analysed. And the role of dimensionality will be emphasized. Theoretical and numerical investigations provide additional informations about that phenomenon. Indeed numerical models permit us to study the influence of some parameters not easily accessible experimentally. Our results show that the above mentioned parameters have a deep impact on the compaction dynamics. Anisotropic grains lead to two different compaction regimes separated by a "burst" of the packing fraction. Friction is observed to modify how the grains are arranged in the pile. This is confirmed by numerical simulations. Cohesive forces between particles inhibit compaction and lead to extremely low values of the packing fraction. [less ▲]

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See detailThe influence of grinding media alloys on the flotation performances at Ellatsite plant (Bulgaria)
Bastin, David ULg; Gaydardzhiev, Stoyan ULg; Jacques, Simon et al

in Proceedings of the XV Balkan Mineral Processing Congress (2013, June)

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See detailThe influence of growth conditions on enterocin-like production by Enterococcus faecium CWBI-B1430 and Enterococcus mundtii CWBI-B1431 isolates from artisanal Peruvian cheeses
Aguilar Galvez, Ana Consuelo ULg; Guillermo Arciniegas, Sandra Denisse; Dubois Dauphin, Robin ULg et al

in Annals of Microbiology (2011), 61

Strains of Enterococcus faecium CWBI-B1430 and Enterococcus mundtii CWBI-B1431, isolated from artisanal-produced Peruvian cheeses, offer a broad potential application as food biopreservatives for heat ... [more ▼]

Strains of Enterococcus faecium CWBI-B1430 and Enterococcus mundtii CWBI-B1431, isolated from artisanal-produced Peruvian cheeses, offer a broad potential application as food biopreservatives for heat-processing treatments. The aim of this work was to optimize the production conditions and medium composition for the production of bacteriocin-like substances (BLIS). The kinetics of the BLIS production for both strains is a growth-associated process, and the maximum inhibitory activity for E. faecium CWBI-B1430 and E. mundtii CWBI-B1431 was achieved after 9 and 8 h of fermentation, respectively. Temperature, initial pH, oxygen level, and their interactions all influence BLIS production for both strains; this influence was specific for each strain. The bacteriocin gene expression in a 20.0-L fermentor confirms previous work carried out by fermentation in the flask; the first reports of expression revealed mundticin KS from E. faecium and enterocin P from E. mundtii. Both strains demonstrated antilisteria activity and were multi-producers of enterocin. Furthermore, the study with whey milk as an inexpensive source of fermentable carbohydrates indicated lower BLIS production than that obtained with M17LG broth. The short chain fatty acid (SCFA) analyses offer a new alternative use for both strains, as strains probiotic, for propionic acid production. [less ▲]

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See detailInfluence of habitat dessication in an African catfish, Heterobranchus longifilis: captivity experimentation
Poncin, Pascal ULg; Hannosset, S.; Bernaerts, P. et al

Poster (1997)

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See detailInfluence of hardened cement paste content on the water absorption of fine recycled concrete aggregates
Zhao, Zengfeng ULg; Remond, Sébastien; Damidot, Denis et al

in Journal of Sustainable Cement-Based Materials (2013)

A linear relationship was found between the mean size of four granular classes (0/0.63, 0.63/1.25, 1.25/2.5, 2.5/5 mm) of different laboratory-made fine recycled concrete aggregates (FRCA) and their ... [more ▼]

A linear relationship was found between the mean size of four granular classes (0/0.63, 0.63/1.25, 1.25/2.5, 2.5/5 mm) of different laboratory-made fine recycled concrete aggregates (FRCA) and their hardened cement paste content (CPC). A method based on salicylic acid dissolution was specifically developed for the measurement of CPC. Results showed that bound water and density of FRCA were strongly correlated with their CPC. Identically, the water absorption coefficient also followed a linear trend as a function of the CPC but only for the three coarser granular classes. Indeed, the water absorption coefficient of the finer fraction of FRCA (0/0.63 mm) cannot be correctly measured using European standard method EN 1097-6 or method no. 78 of IFSTTAR; but it can be obtained by extrapolation from the previous linear trend. As a consequence, the accurate total water absorption of FRCA (fraction 0/5 mm) can be estimated. [less ▲]

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