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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 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 High Temperature Heat Treatment on in situ Transformation of Mo-rich Eutectic Carbides in HSS and Semi-HSS Grades
Tchuindjang, Jérôme Tchoufack ULg; Sinnaeve, Mario; Lecomte-Beckers, Jacqueline ULg

in Lecomte-Beckers, Jacqueline; Tchuindjang, Jérôme Tchoufack (Eds.) Conference Proceedings of Abrasion 2011 (2011, August)

Alloys of the complex system Fe-Si-C-Cr-C-X, where X is a strong carbide forming-element are well known to exhibit interesting mechanical properties, including wear and abrasion resistances. Such a ... [more ▼]

Alloys of the complex system Fe-Si-C-Cr-C-X, where X is a strong carbide forming-element are well known to exhibit interesting mechanical properties, including wear and abrasion resistances. Such a tribological behavior is mainly due to the presence of carbides especially those obtained during the solidification route and that are known as primary or eutectic carbides. It may therefore be interesting to determine the relative stability of primary carbides when considering thermal and thermomechanical treatments performed at a temperature high enough to allow either the homogenization of the matrix or the occurrence of a desired grain size. This thermal stage is often required to produce tailored microstructures that can lead to improved mechanical properties. In this work a series of thermal treatments performed on samples originated form casting foundry parts were done. Raw materials are both HSS and semi-HSS grades used in application where wear resistance is needed. Thermo- Calc® (TC) simulations and Differential Thermal Analysis (DTA) were performed to determine the crystallization behavior and the subsequent solid state transformations of the studied alloys respectively in equilibrium and in non equilibrium conditions. Light and Scanning Electron Microscopies were done together with hardness measurements in order to enhance metallurgical features of the heat treated samples. Image analysis yielded the determination of carbides volume fractions. It appears from microstructural analyses and carbides quantification that Mo-rich eutectic carbides undergo in situ phase transformations during heat treatments. In fact Mo-rich M2C carbides transform themselves into MC, M6C and M3C, through a so-called budding phenomenon. Such a phenomenon is the evidence of a preferential migration of some atoms that escape from the parent M2C carbide to diffuse further away from their initial site with increasing time and temperature. The stable or metastable nature of eutectic carbides is also discussed from DTA and TC results, as M2C carbides found in both as-conditions and DTA samples were not predicted by equilibrium conditions. [less ▲]

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See detailInfluence of HIV-1 and placental malaria co-infection on newborn biometry and Apgar scores in Kinshasa Democratic Republic of Congo
Modia O'Yandjo, A.; Foidart, Jean-Michel ULg; RIGO, Jacques ULg

in Journal de Gynécologie, Obstétrique et Biologie de la Reproduction (2011), 40(5), 460-4

Objective The aim of this study was to assess the impact of HIV-1 and placental malaria co-infection on newborn biometry and Apgar scores. Methods 146 HIV-1 infected and 149 HIV-1 uninfected consent ... [more ▼]

Objective The aim of this study was to assess the impact of HIV-1 and placental malaria co-infection on newborn biometry and Apgar scores. Methods 146 HIV-1 infected and 149 HIV-1 uninfected consent mothers and their newborns were recruited. Placental biopsies examination confirmed the presence or absence of placental malaria. Birth weight (BW), placental weight, cranial circumference, brachial perimeter, height, Body Mass Index (BMI) and Apgar scores at 1’, 5’, 10’ were taken. The Chi2 test and t -Student test were used for data statistical analysis. Results The global placental malarial infection prevalence was 72% but was 91% in HIV-1 infected vs. 53.7% in HIV-1 uninfected mothers (p <0.0001). The mean BW of HIV-1 co-infected mother’s newborns was slightly inferior to that of HIV-1 uninfected mother’s babies (3,033±524g vs. 3,236±565g) but this difference was not statistically significant (p >0.05). No other significant biometric differences were noted (p >0.05). But, the co-infection influenced negatively Apgar scores at 5’ (p <0.05). Conclusion HIV-1 co-infected mothers were more frequently exposed to placental malaria infection. The co-infection reduced the Apgar scores taken at the fifth minute. [less ▲]

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See detailInfluence of homogenization and drying on the thermal stability of microfibrillated cellulose
QUIEVY, N.; Jacquet, Nicolas ULg; SCLAVONS, M. et al

in Polymer Degradation and Stability (2010), 95

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See detailInfluence of homogenization and drying on the thermal stability of microfibrillated cellulose
QUIEVY, N.; Jacquet, Nicolas ULg; SCLAVONS, M. et al

in Polymer Degradation and Stability (2010), 95

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See detailInfluence of Homogenization Treatment on Physicochemical 4 Properties and Enzymatic Hydrolysis Rate of Pure 5 Cellulose Fibers
Jacquet, Nicolas ULg; Vanderghem, Caroline ULg; Danthine, Sabine ULg et al

in Applied Biochemistry and Biotechnology (in press)

The aim of this study is to compare the effect of different homogenization treat- 12 ments on the physicochemical properties and the hydrolysis rate of a pure bleached 13 cellulose. Results obtained show ... [more ▼]

The aim of this study is to compare the effect of different homogenization treat- 12 ments on the physicochemical properties and the hydrolysis rate of a pure bleached 13 cellulose. Results obtained show that homogenization treatments improve the enzymatic 14 hydrolysis rate of the cellulose fibers by 25 to 100 %, depending of the homogenization 15 treatment applied. Characterization of the samples showed also that homogenization had an 16 impact on some physicochemical properties of the cellulose. For moderate treatment inten- 17 sities (pressure below 500 b and degree of homogenization below 25), an increase of water 18 retention values (WRV) that correlated to the increase of the hydrolysis rate was highlighted. 19 Result also showed that the overall crystallinity of the cellulose properties appeared not to be 20 impacted by the homogenization treatment. For higher treatment intensities, homogenized 21 cellulose samples developed a stable tridimentional network that contributes to decrease 22 cellulase mobility and slowdown the hydrolysis process. [less ▲]

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