Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailImprovement of the Parametric Fire of Eurocode 1 based on Experimental Tests Results
Franssen, Jean-Marc ULg

in Curtat, Michel (Ed.) FIRE SAFETY SCIENCE, Proceedings of the sixth international Symposium (2000)

The basic equations, the limitations and the main features of the parametric fire proposed in Annexe B of Eurocode 1 are given. 48 experimental fire tests are used to assess the validity of this model ... [more ▼]

The basic equations, the limitations and the main features of the parametric fire proposed in Annexe B of Eurocode 1 are given. 48 experimental fire tests are used to assess the validity of this model. The model has been applied to these tests and the comparison has been made, for each test, on the maximum temperature in the air and on the maximum temperature calculated in 2 hypothetical steel sections, one thermally protected and one unprotected. The agreement is very poor for the air and for the unprotected steel temperature, and somewhat better for the protected steel temperature. Some proposals are made which allow to improve the agreement, while keeping the same expressions for the parametric fire. These modifications concern the equivalent thermal properties of multi material walls, and the introduction of a minimum duration of the fire and a of a ventilation effect in case of fuel-bed controlled fires. [less ▲]

Detailed reference viewed: 91 (2 ULg)
Full Text
Peer Reviewed
See detailImprovement of the thermoelectric properties of [Bi1.68Ca2O4-delta](RS)[CoO2](1.69) cobaltite by chimie douce methods
Muguerra, Hervé; Rivas-Murias, Beatriz; Traianidis, Maria et al

in Journal of Solid State Chemistry (2010), 183(6), 1252-1257

[Bi1 68Ca2O4 delta](RS)[CoO2](1 69) has been obtained by different chimie douce methods and uniaxially or isostatically pressed The influence of these parameters on the thermoelectric properties has been ... [more ▼]

[Bi1 68Ca2O4 delta](RS)[CoO2](1 69) has been obtained by different chimie douce methods and uniaxially or isostatically pressed The influence of these parameters on the thermoelectric properties has been investigated. Contrary to the Seebeck coefficient, which remains unchanged, the electrical conductivity is greatly modified In particular, spray-drying synthesis followed by uniaxial pressing results in an electrical conductivity two times larger than in the case of conventional solid state synthesis. Our results suggest that a narrow particle size distribution is beneficial to the thermoelectric properties of the layered compounds. The spray-drying technique seems to be promising to Improve the electrical conductivity of layered materials. Moreover, this method presents other advantages (homogeneous samples and less energetic processing) which could be interesting to the future manufacturing of thermoelectric devices (C) 2010 Elsevier Inc. All rights reserved [less ▲]

Detailed reference viewed: 67 (10 ULg)
Full Text
Peer Reviewed
See detailImprovement of the Theta(+) width estimation method on the light cone
Lorce, Cédric ULg

in Physical Review D (2006), 74(5),

Recently, Diakonov and Petrov have suggested a formalism in the chiral quark soliton model allowing one to derive the 3-, 5-, 7-, ...quark wave functions for the octet, decuplet, and antidecuplet. They ... [more ▼]

Recently, Diakonov and Petrov have suggested a formalism in the chiral quark soliton model allowing one to derive the 3-, 5-, 7-, ...quark wave functions for the octet, decuplet, and antidecuplet. They have used this formalism and many strong approximations in order to estimate the exotic Theta(+) width. The latter has been estimated to similar to 4 MeV. Besides they obtained that the 5-quark component of the nucleon is about 50% of its 3-quark component meaning that relativistic effects are not small. We have improved the technique by taking into account some relativistic corrections and considering the previously neglected 5-quark exchange diagrams. We also have computed all nucleon axial charges. It turns out that exchange diagrams affect very little Diakonov's and Petrov's results while relativistic corrections reduce the Theta(+) width to similar to 2 MeV and the 5- to 3-quark component of the nucleon ratio to 30%. [less ▲]

Detailed reference viewed: 10 (5 ULg)
Full Text
Peer Reviewed
See detailImprovement of the UNIQUAC combinatorial-entropy term by adjusting the standard segment
Bronneberg, Rob; Pfennig, Andreas ULg

in Journal of Chemical & Engineering Data (2011), 56

Detailed reference viewed: 23 (9 ULg)
Full Text
Peer Reviewed
See detailImprovement of transport condition of swabs for group B streptococcal (GBS) screening
MELIN, Pierrette ULg; Dodémont, Magali; Sarlet, Gilles ULg et al

in Program and Abstract of the 53rd Intersciences Conference on Antimicrobial Agents and Chemotherapy. Washington, USA: ASM. (2013, September)

BACKGROUND For the screening-based strategy for prevention of perinatal GBS disease, CDC Guidelines as many others recommend use of appropriate transport media (Amies, Stuart, e.g.) and processing of ... [more ▼]

BACKGROUND For the screening-based strategy for prevention of perinatal GBS disease, CDC Guidelines as many others recommend use of appropriate transport media (Amies, Stuart, e.g.) and processing of specimen as soon as possible within 1 to 4 days. False negative cultures occur for several causes including lost of GBS viability during transport. Could Lim broth, recommended for the selective enrichment, and Granada tubes be used as transport media for swab? Simulating conditions of routine practice, Lim broth and Granada tubes, were evaluated in vitro as transport media. METHODS Tubes of 3 brands of Lim broth (Becton Dickinson, bioMérieux, Copan) and Granada tubes (bioMérieux) were inoculated with low inocula of 10-100 CFU of GBS. Each type of tubes was incubated at 4°C, room T° (RT) and 35°C. GBS were enumerated from each tube by subculture on blood agar after 1, 2, 3 and 4 days of storage at the different T°. All tests were processed in triplicates with 3 strains of GBS belonging to serotype Ia, III and V. RESULTS No difference of survival was observed between the 3 strains. T° had significant impact on GBS recovery for each type of tubes. At 4°C the viability was hardly sustained along the 4 days. At RT and 35°C, an increase >6 log of the inocula was observed. The increase of GBS density was sustained at least 4 days for the 3 brands of Lim broth. For the Granada broth, such increase was also observed but at day 3 for tubes incubated at 35°C, viability decreased and for some tubes, GBS subcultures were negative at day 3 or 4. CONCLUSION To improve sensitivity of GBS screening cultures, Lim broth could be recommended as a strong transport media and the advisable storage condition would be RT to 35°C up to 4 days. In this way, initiating selective enrichment culture at the time of collection of specimen would provide higher sensitivity even for low density of colonization. Transport at 4°C should be avoided in favour with RT to 35°C. Studies in clinical setting are expected. For Granada tubes, storage at RT was fine but improvement seemed restricted in time at 35°C as there was a loss of viability after 3 days. For Granada tubes, extended evaluation and delimitation of use are needed. [less ▲]

Detailed reference viewed: 31 (4 ULg)
Full Text
See detailImprovement of Transport Safety by control of fog production in a chamber
Andre, Philippe ULg

Report (2003)

Rapport final du projet "Improvement of Transport Safety by control of fog production in a chamber", qui s'est déroulé entre 2000 et 2003, finance par l'Union Européenne, dans le cadre du programme ... [more ▼]

Rapport final du projet "Improvement of Transport Safety by control of fog production in a chamber", qui s'est déroulé entre 2000 et 2003, finance par l'Union Européenne, dans le cadre du programme "Growth" [less ▲]

Detailed reference viewed: 27 (0 ULg)
Full Text
Peer Reviewed
See detailImprovement of xylanase production by Penicillium canescens 10-10c in solid-state fermentation
Assamoi, antoine; Delvigne, Frank ULg; Aldric, Jean-Marc ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2008)

Detailed reference viewed: 32 (11 ULg)
Full Text
Peer Reviewed
See detailImprovement of Ylang-Ylang Essential Oil Characterization by GCxGC-TOFMS
Brokl, Michal ULg; Fauconnier, Marie-Laure ULg; Benini, Céline et al

in Molecules (2013), 18(2), 1783-1797

A single fraction of essential oil can often contain hundreds of compounds. Despite of the technical improvements and the enhanced selectivity currently offered by the state-of-the-art gas chromatography ... [more ▼]

A single fraction of essential oil can often contain hundreds of compounds. Despite of the technical improvements and the enhanced selectivity currently offered by the state-of-the-art gas chromatography (GC) and mass spectrometry (MS) instruments, the complexity of essential oils is frequently underestimated. Comprehensive two-dimensional GC coupled to time-of-flight MS (GC×GC-TOFMS) was used to improve the chemical characterization of ylang-ylang essential oil fractions recently reported in a previous one-dimensional (1D) GC study. Based on both, the enhanced chromatographic separation and the mass spectral deconvolution, 161 individual compounds were identified and labeled as potentially characteristic analytes found in both low and high boiling fractions issued from distillation of mature ylang-ylang flowers. Compared to the most recent full GC-MS characterization, this represents 75 new compounds, essentially consisting of terpenes, terpenoid esters, and alcohols. [less ▲]

Detailed reference viewed: 48 (13 ULg)
Peer Reviewed
See detailAn improvement on area-perimeter ratios for interior-edge evaluation of habitats.
Bogaert, Jan ULg; Impens, Ivan

in Muge, F.; Pinto, R. C.; Piedade, M. (Eds.) Proceedings of the 10th Portuguese Conference on Pattern Recognition (1998)

Detailed reference viewed: 35 (13 ULg)
Peer Reviewed
See detailImprovement Yarrowia lipolytica lipase production by mutant selection.
Destain, Jacqueline ULg; Roblain, D.; Thonart, Philippe ULg

in Archives Internationales de Physiologie et de Biochimie (1993), 101(B1-B25),

Detailed reference viewed: 6 (1 ULg)
Full Text
Peer Reviewed
See detailImprovements and validation of mid-infrared predictions of milk fatty acid
Soyeurt, Hélène ULg; McParland, Sinead; Donagh, Berry et al

Conference (2010, July)

The development of mid-infrared equations to predict the milk fatty acid (FA) content of milk allows prompt analysis of large numbers of samples. The first aim was to improve these predictions by ... [more ▼]

The development of mid-infrared equations to predict the milk fatty acid (FA) content of milk allows prompt analysis of large numbers of samples. The first aim was to improve these predictions by comparing 6 statistical approaches. The second one was to validate the new equations using an independent sample set. The calibration set contained 239 spectrally different Belgian milk samples collected for over 2 years from several cows and breeds. FA were quantified by gas chromatography (GC). Statistical approaches tested were 1) partial least squares regression (PLS), 2) PLS and first derivative, 3) PLS and repeatability file (RF), 4) PLS, first derivative and RF, 5) PLS, second derivative, and 6) PLS, second derivative and RF. This last file contained spectra obtained from the same samples using 5 spectrometers. Cross-validation (CV) used 20 groups from the calibration set. Methods were compared using the ratio of the standard deviation of GC values to the standard error of CV (RPD). An external validation permitted a second comparison and was done using 362 samples collected for one year from multiple breeds and cows in Belgium, Ireland, and Scotland. Different RPD values were obtained by the 6 methods. Generally the equations developed using method 4 gave better results suggesting the adaptation of the methodology to the studied FA. It confirms by the obtained validation coefficients of determination. Highest values were observed for the equations with the highest RPD values except for C18:0. The ability to predict FA using method 4 gave superior results to those shown in previous publications. [less ▲]

Detailed reference viewed: 61 (8 ULg)