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
Peer Reviewed
See detailComparison of transport in lysimeters with undisturbed loamy sand and silty soil using non invasive imaging with electrical resistivity tomography.
Garré, Sarah ULg; Koestel, Johannes; Vanderborght, Jan et al

in Geophysical Research Abstracts (2009, April 23)

Detailed reference viewed: 11 (4 ULg)
Peer Reviewed
See detailComparison of transport in lysimeters with undisturbed loamy sand and silty soil using non-invasive imaging with electrical resistivity tomography
Garré, Sarah ULg; Koestel, Johannes; Javaux, Mathieu et al

Conference (2009, September)

Detailed reference viewed: 15 (1 ULg)
Full Text
See detailComparison of transrectal ultrasound and plasma pregnancy-associated glycoprotein (PAG) as pregnancy tests of reindeer
Savela, H.; Vahtiala, S.; Lindeberg, H. et al

in Proceedings of the 16th International Congress on Animal Reproduction (2008)

Detailed reference viewed: 6 (0 ULg)
Full Text
See detailA comparison of triangle and quadrangle finite elements for large strain elastoplastic formulations
KARASEVA, Olga; Stainier, Laurent ULg; Careglio, C. et al

in Proceedings of ACOMEN’2008, Advanced Computational Methods in Engineering (2008)

The paper presents a comparative study of different elastoplastic large strain formulations used in research groups in Mendoza and Li`ege. The comparison is focused on a few academic standardized problems ... [more ▼]

The paper presents a comparative study of different elastoplastic large strain formulations used in research groups in Mendoza and Li`ege. The comparison is focused on a few academic standardized problems, in particular necking of a cylindrical bar in tension. Stress distribution at necking section, as well as load histories are analyzed for all three formulations. Two other test cases consider bending of the so-called ”Greco” beam and upsetting of a cylinder. Numerical results show that all approaches yield very similar results and thus are equally valid. Furthermore, quadratic 6-noded triangles provide a good alternative to bilinear quadrangles, even if sometimes they appear to be more sensitive to big distorsions. [less ▲]

Detailed reference viewed: 84 (5 ULg)
See detailComparison of troponin I and troponin T changes after PTCA
Chapelle, Jean-Paul ULg

Conference (1999, February)

Detailed reference viewed: 2 (0 ULg)
Peer Reviewed
See detailComparison of two automated solid-phase extraction methods for the HPLC determination of nifedipine in human plasma with electrochemical detection
Maes, P.; Sibenaler-Dechamps, R.; Zimmer, C. et al

in Journal de Pharmacie de Belgique (1992), 47

Detailed reference viewed: 4 (1 ULg)
Full Text
See detailComparison of two drainage flow situations on a gentle forested slope
Heinesch, Bernard ULg; Yernaux, Michel ULg; Aubinet, Marc ULg

Poster (2010)

Drainage flows generated on a gentle slope in stable conditions were analysed at the forested site of Vielsalm (Belgium). Two distinct situations were encountered, one corresponding to vertical ... [more ▼]

Drainage flows generated on a gentle slope in stable conditions were analysed at the forested site of Vielsalm (Belgium). Two distinct situations were encountered, one corresponding to vertical convergence, characterised by a negative vertical velocity at the canopy top, the other corresponding to an equilibrium situation without any vertical movement. The causes of these two distinct flow patterns were analysed. Moreover, combined measurements of vertical velocity above the canopy and horizontal velocity divergence below the canopy were found to comply with the continuity equation: an acceleration of the horizontal flow was indeed observed in the trunk-space in convergence situations while not in equilibrium conditions. These measurements combined with those of the horizontal [CO2] gradient below the canopy were found to met the dilution hypothesis suggested by Aubinet et al.(2003): the horizontal [CO2] gradient was negative in convergence situations while slightly positive in equilibrium conditions. The existence of such patterns allows us to confirm the coherence of advection observations made at the site and help to better understand the mechanisms responsible of night flux exchanges at work in stable conditions in complex terrains. Nevertheless, difficulties were met when trying to obtain reliable estimates of the advection transport terms. The estimation of the vertical velocity in the trunk-space obtained by using the divergence measurements refuted the hypothesis of linearity of the vertical profile of vertical velocity, assumption usually used when computing vertical advection. This problem resulted in a great uncertainty on vertical advection which did not allowed to improve the night-flux estimation by adding advection terms to the turbulent flux and the storage. [less ▲]

Detailed reference viewed: 26 (1 ULg)
Full Text
Peer Reviewed
See detailComparison of two immunoassays for oxidized LDL determination
Le Goff, Caroline ULg; Haleng, Jeanine ULg; Denooz, André ULg et al

in Annales de Biologie Clinique (2009), 67(1),

Detailed reference viewed: 17 (7 ULg)
Full Text
Peer Reviewed
See detailComparison of two immunoassays for quantitative measurement of oxydized-LDL
Le Goff, Caroline ULg; Haleng, Jeanine ULg; Chapelle, Jean-Paul ULg

in Immuno-Analyse & Biologie Spécialisée [=IBS] (2009), 24

Detailed reference viewed: 13 (3 ULg)
Full Text
Peer Reviewed
See detailComparison of two inverse analysis techniques for learning deep excavation response
Hashash, Youssef; Levasseur, Séverine ULg; Osouli, Abdolreza et al

in Computers & Geotechnics (2010), 37

Performance observation is a necessary part of the design and construction process in geotechnical engineering. For deep urban excavations, empirical and numerical methods are used to predict potential ... [more ▼]

Performance observation is a necessary part of the design and construction process in geotechnical engineering. For deep urban excavations, empirical and numerical methods are used to predict potential deformations and their impacts on surrounding structures. Two inverse analysis approaches are described and compared for an excavation project in downtown Chicago. The first approach is a parameter optimization approach based on genetic algorithm (GA). GA is a stochastic global search technique for optimizing an objective function with linear or non-linear constraints. The second approach, self-learning simulations (SelfSim), is an inverse analysis technique that combines finite element method, continuously evolving material models, and field measurements. The optimization based on genetic algorithm approach identifies material properties of an existing soil model, and SelfSim approach extracts the underlying soil behavior unconstrained by a specific assumption on soil constitutive behavior. The two inverse analysis approaches capture well lateral wall deflections and maximum surface settlements. The GA optimization approach tends to overpredict surface settlements at some distance from the excavation as it is constrained by a specific form of the material constitutive model (i.e. hardening soil model); while the surface settlements computed using SelfSim approach match the observed ones due to its ability to learn small strain non-linearity of soil implied in the measured settlements. [less ▲]

Detailed reference viewed: 51 (5 ULg)
Full Text
Peer Reviewed
See detailComparison of two methods currently used to determine the interaction between cyclodextrins and drugs: phase solubility diagrams and NMR spectroscopy
Piel, Géraldine ULg; Moutard, Stephane; Perly, Bruno et al

in Journal of Drug Delivery Science and Technology (2004), 14(1, JAN-FEB), 87-91

Two methods usually used in the literature to determine stability constant values (Kc) of cyclodextrin complexes were compared: the phase solubility diagram and NMR spectroscopy. Two model drugs were used ... [more ▼]

Two methods usually used in the literature to determine stability constant values (Kc) of cyclodextrin complexes were compared: the phase solubility diagram and NMR spectroscopy. Two model drugs were used to determine limitations of both techniques: betamethasone and miconazole, with three cyclodextrins: beta-cyclodextrine (betaCD), dimethylated-betaCD (Dimeb) and trimethylated-betaCD (Trimeb). This study shows that both techniques can give the same Kc value if they are used in exactly the same conditions with well defined cyclodextrins. As a matter of fact, if the degree of substitution of cyclodextrin is not well defined (as it is often the case with Dimeb), results are biased. This study also shows that when interactions between both molecules are weak (< 1000 M-1), stability constants can not be determined by NMR due to low chemical shift variations. The limitations of the phase solubility diagram method are an oversimplification of the solubility data which can lead to large errors in the calculation of the stability constant values. Moreover, this method is time and material consuming. [less ▲]

Detailed reference viewed: 52 (7 ULg)
Full Text
Peer Reviewed
See detailA comparison of two methods for pulmonary function testing in horses with upper and lower airway obstruction
Van Erck, Emmanuelle; Duvivier, D. H.; Art, Tatiana ULg et al

Poster (1997, October 24)

Detailed reference viewed: 29 (0 ULg)
Full Text
Peer Reviewed
See detailComparison of Two Methods, UHPLC-UV and UHPLC-MS/MS, for the Quantification of Polyphenols in Cider Apple Juices
Verdu, Cindy ULg; Gatto, Julia; Freuze, Ingrid et al

in Molecules (2013), 18/9

Abstract: The aim of this study was to develop faster and more efficient phenotyping methods for in-depth genetic studies on cider apple progeny. The UHPLC chromatographic system was chosen to separate ... [more ▼]

Abstract: The aim of this study was to develop faster and more efficient phenotyping methods for in-depth genetic studies on cider apple progeny. The UHPLC chromatographic system was chosen to separate polyphenolic compounds, and quantifications were then simultaneously performed with a UV-PDA detector and an ESI-triple quadrupole mass analyzer (SRM mode). Both quantification methods were validated for 15 major compounds using two apple juice samples, on the basis of linearity, limits of detection and quantification, recovery and precision tests. The comparison between UV and SRM quantifications in 120 different samples of a cider apple progeny showed an excellent correlation for major compounds quantified with both methods. However, an overestimation was revealed for five compounds with the UV detector and the mass analyzer. Co-elution and matrix effects are discussed to explain this phenomenon. SRM methods should therefore be considered with restrictions in some cases for quantification measurements when several phenolic compounds are simultaneously quantified in complex matrices such as apple juices. For both methods, analyses were carried out over short periods of time while maintaining a high quality for the simultaneous quantification of phenolic compounds in apple juice. Each method is relevant for more in-depth genetic studies of the polyphenol content of apple juice. [less ▲]

Detailed reference viewed: 27 (14 ULg)
Full Text
Peer Reviewed
See detailA Comparison of Two Spelling Brain-Computer Interfaces Based on Visual P3 and SSVEP in Locked-In Syndrome
Combaz, Adrien; Chatelle, Camille ULg; Robben, Arne et al

in PLoS ONE (2013), 8(9), 73691

Objectives: We study the applicability of a visual P3-based and a Steady State Visually Evoked Potentials (SSVEP)-based Brain-Computer Interfaces (BCIs) for mental text spelling on a cohort of patients ... [more ▼]

Objectives: We study the applicability of a visual P3-based and a Steady State Visually Evoked Potentials (SSVEP)-based Brain-Computer Interfaces (BCIs) for mental text spelling on a cohort of patients with incomplete Locked-In Syndrome (LIS). Methods: Seven patients performed repeated sessions with each BCI. We assessed BCI performance, mental workload and overall satisfaction for both systems. We also investigated the effect of the quality of life and level of motor impairment on the performance. Results: All seven patients were able to achieve an accuracy of 70% or more with the SSVEP-based BCI, compared to 3 patients with the P3-based BCI, showing a better performance with the SSVEP BCI than with the P3 BCI in the studied cohort. Moreover, the better performance of the SSVEP-based BCI was accompanied by a lower mental workload and a higher overall satisfaction. No relationship was found between BCI performance and level of motor impairment or quality of life. Conclusion:Our results show a better usability of the SSVEP-based BCI than the P3-based one for the sessions performed by the tested population of locked-in patients with respect to all the criteria considered. The study shows the advantage of developing alternative BCIs with respect to the traditional matrix-based P3 speller using different designs and signal modalities such as SSVEPs to build a faster, more accurate, less mentally demanding and more satisfying BCI by testing both types of BCIs on a convenience sample of LIS patients. [less ▲]

Detailed reference viewed: 43 (7 ULg)