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Peer Reviewed
See detailAnalytical and finite element modelling of a capacitive acceleromter
Houlihan, R; Chee, KL; Kraft, Michael ULiege

in Proc. Eurosensors XVII Conference (2003, September)

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See detailAn analytical approach for Piano Key weir hydraulic design
Machiels, Olivier; Dewals, Benjamin ULiege; Archambeau, Pierre ULiege et al

in Erpicum, Sébastien; Laugier, Frédéric; Pfister, Michael (Eds.) et al Labyrinth and Piano Key weirs II - PKW 2013 (2014)

A hydraulic design equation for Piano Key Weirs is set up using the results of a large experimental parametric study. Comparison of the analytical formulation with experi-mental data from various physical ... [more ▼]

A hydraulic design equation for Piano Key Weirs is set up using the results of a large experimental parametric study. Comparison of the analytical formulation with experi-mental data from various physical modeling studies, considering idealized as well as real projects Piano Key Weirs configurations, shows a 15% accuracy in unit discharge prediction on a large range of geometric parameters values. Comparison of the proposed formulation to two other recently proposed equations highlights the importance to consider such analytical approaches inside the range of parameter values for which they have been validated. [less ▲]

Detailed reference viewed: 69 (2 ULiège)
See detailAnalytical Aspects of POPs
Focant, Jean-François ULiege

Scientific conference (2011, January)

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See detailAnalytical Aspects of POPs
Focant, Jean-François ULiege

Conference (2010, April)

Detailed reference viewed: 6 (1 ULiège)
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See detailAnalytical calculation of the electrostatic interaction energy within the CNDO framework
Dehareng, Dominique ULiege; Dive, Georges ULiege; Ghuysen, Jean-Marie ULiege

in International Journal of Quantum Chemistry (1993), 46(6), 711-734

This work analyses the adequacy of an analytical electrostatic energy formulation within the CNDO framework to predict the stable conformations of large molecular complexes. Comparisons are made with ab ... [more ▼]

This work analyses the adequacy of an analytical electrostatic energy formulation within the CNDO framework to predict the stable conformations of large molecular complexes. Comparisons are made with ab initio results for small systems such as water-formamide, methanol-water-imidazole, or guanine-cytosine and with AM1 results for two large systems: a molecular tweezer + the 9-methyladenine complex and a model active site of the alpha-chymotrypsin and its ligand complex. This approach is efficient in providing reliable conformers for large molecular systems in a very fast way. [less ▲]

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See detailAnalytical Challenges in the Study of South-North Intra-EU Mobility
Lafleur, Jean-Michel ULiege; Stanek, Mikolaj

Conference (2016, November 29)

This presentation discusses the challenges met in measuring the flows of Southern European EU migrants who moved to North Western Europe during the financial and economic crisis that started in 2008. The ... [more ▼]

This presentation discusses the challenges met in measuring the flows of Southern European EU migrants who moved to North Western Europe during the financial and economic crisis that started in 2008. The presentation shows that EU wide and national databases have strenghts and weaknesses and that further improvement in statistical data collection process could help the understanding of complex migratory patterns. More details is available on this research by downloading the free e-bbok at the following address: http://www.springer.com/gp/book/9783319397610 [less ▲]

Detailed reference viewed: 142 (6 ULiège)
See detailThe analytical chemistry of dioxins and PCBs
Focant, Jean-François ULiege

Scientific conference (2009, May)

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See detailAn Analytical Cost Assessment Module for the Detailed Design Stage
Caprace, Jean-David ULiege; Rigo, Philippe ULiege; Warnotte, Renaud ULiege et al

in Conference on Computer Applications and Information Technology in the Maritime Industries (COMPIT) (2006, May)

The main goal of the project is to implement a “real time” and automatic cost assessment model of the ship hull construction, which integrates the design criteria and production parameters. The presented ... [more ▼]

The main goal of the project is to implement a “real time” and automatic cost assessment model of the ship hull construction, which integrates the design criteria and production parameters. The presented method for short-term cost assessment promises to increase the productivity. Nowadays, cost assessment is a key task of an integrated ship design. The various methods to estimate the production cost differs with the required information (input data). The less information is needed, the earlier this method can be used in the design process. The more information is used, the better we can assess the differences between design alternatives. This means: − At the basic design stage: validate the budget and give a reliable bidding price, − At the detailed design stage:, plan the deadlines and establish the production schedule, − At the scheduling production stage: distribute the workload between the various production workshops and assess the productivity. A first prototype of cost assessment module reaches the validation stage at the Alstom Marine St Nazaire shipyard (Chantiers de l’Atlantique) within the framework of the European project InterSHIP which has partly financed the study. In the future, cost assessment will become increasing important. It is proposed to assist/help the designers by a “real time” follow-up of the cost, starting at the earliest conceptual design stage up to the latest detailed design stage. The development such a cost assessment tool requires considering simultaneously the design criteria and the production parameters. Designers will consequently be able to choose the least expensive options at each step of the design procedure (earlier is of course better). [less ▲]

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See detailAnalytical criteria for use of MS/MS for determination of dioxins and dioxin-like PCBs in feed and food
Kotz, A; Malisch, R; Focant, Jean-François ULiege et al

in Organohalogen Compounds (2012, August), 74

Detailed reference viewed: 128 (5 ULiège)
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See detailAnalytical Derivation of Single-Impulse Maneuvers Guaranteeing Bounded Relative Motion Under J2
Martinusi, Vladimir ULiege; Gurfil, Pini

in Journal of Guidance Control Dynamics (2014), 37

Keeping a cluster of satellites within bounded relative distances requires active control, because natural perturbations (the most significant of which is the J2 term in the geopotential) tend to move the ... [more ▼]

Keeping a cluster of satellites within bounded relative distances requires active control, because natural perturbations (the most significant of which is the J2 term in the geopotential) tend to move the satellites apart. Whereas there is abundant literature on controlling the relative drift using multiple impulsive maneuvers and approximate astrodynamical models involving mean orbital elements, the works that attempt to minimize the number of impulses while using the inertial position and velocity vectors of the satellites are scarce. In this paper, single-impulse distance-keeping maneuvers are derived, without approximating the J2-perturbed dynamics. An analytical derivation of minimum-fuel impulsive maneuvers between equatorial orbits is provided, while relying on radial period and orbital angle matching conditions. Then, a continuation procedure is used to obtain single-impulse relative distance control between inclined orbits. The development of the impulsive maneuvers relies on the inertial position and velocity vectors of the satellites and does not involve mean elements. In each step, necessary and sufficient conditions for the existence of a single-impulse maneuver are provided. The results are illustrated using a number of realistic scenarios, such as a simulation that includes a 21×21 gravitational model, drag, and lunisolar attraction. [less ▲]

Detailed reference viewed: 37 (6 ULiège)
See detailAnalytical determination of Isomaltooligosaccharides mixture known as emerging prebiotics.
Goffin, Dorothée ULiege

Poster (2007)

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human ... [more ▼]

Isomaltooligosaccharides (IMOs) are non-digestible oligosaccharides, considered as prebiotics and therefore aim to selectively feed probiotics indigenous to the human colon. Recent data obtained in human subjects, support the involvement of dietary oligosaccharides in physiological processes in the different intestinal cell type and also outside the gastrointestinal tract (e.g. hormone production, lipid and carbohydrate metabolism). IMOs consists of glucose monomers linked by at least one α-1-6, or in a lower proportion α -1-3 (nigerose family) or α -1-2 (kojibiose family) glucosidic linkages. In our case they are produced enzymatically from corn starch. It results in a very complex mixture with molecules characterized at the same time by their DP value (from 2 to ~20), linkages types (α-1-2, 3 or 6) and the proportion and position of each type of linkage (only α -1-6 or combined types). The challenge of this study was to find a qualitative and quantitative method to characterize the syrups. In a subsequent study, every unidentified peak could be determined by NMR or Mass spectrometry. Three different chromatographic methods have been tested and compared over their selectivity, sensibility, robustness, applicability and their quantitative power. [less ▲]

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See detailAnalytical determination of stress patterns in the periodontal ligament during orthodontic tooth movement.
Van Schepdael, An ULiege; Geris, Liesbet ULiege; Vander Sloten, Jos

in Medical Engineering & Physics (2013), 35(3), 403-10

A dedicated software package that allows simulation of tooth movement can lead to shortening of the treatment program in orthodontics. A first step in the development of this software is the modelling of ... [more ▼]

A dedicated software package that allows simulation of tooth movement can lead to shortening of the treatment program in orthodontics. A first step in the development of this software is the modelling of the movement of a single tooth. Forces applied to the crown of the tooth are transmitted to the alveolar bone through the periodontal ligament, stretching, and compressing the ligament, eventually resulting in tooth movement. This paper presents an analytical model that predicts stresses and strains inside this ligament by approximating the shape of the root as an elliptic paraboloid. The model input consists of 2 material parameters and 4 geometrical parameters. To assess the accuracy of the model a finite element model (FEM) was constructed to compare the results and the influence of the eccentricity of the root was studied. The results show that the model is able to successfully describe the global behavior of the PDL and, except at a region near the alveolar crest, the differences between analytical and FEM results are small. In contrast to FEM, the analytical model does not require setting up a 3D-model and creating a mesh, allowing for significantly lower computational times and reducing cost when implementing in clinical practice. [less ▲]

Detailed reference viewed: 27 (1 ULiège)
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See detailAnalytical developments to assess the crashworthiness of an offshore wind turbine jacket impacted by a ship
Pire, Timothée ULiege; Le Sourne, Hervé; Buldgen, Loïc ULiege et al

Poster (2015, December 10)

As the number of offshore wind farms is constantly increasing, impacts between ships and wind turbines is becoming a major concern. Nowadays, design offices use finite elements simulations to assess the ... [more ▼]

As the number of offshore wind farms is constantly increasing, impacts between ships and wind turbines is becoming a major concern. Nowadays, design offices use finite elements simulations to assess the crashworthiness of offshore supporting structures, which give accurate results but is time demanding. There is therefore a need for a faster method, especially during the pre-design stage. The purpose of this research is to develop analytical formulations, based on the so-called continuous elements method in order to compute the resistance of offshore wind turbine jackets when submitted to an impact. [less ▲]

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See detailAnalytical estimate for low-altitude ENA emissivity
Goldstein, J.; Bisikalo, D.V.; Shematovich, V.I. et al

in Journal of Geophysical Research. Space Physics (2016), 121(2), 1167-1191

We formulate the first analytical model for energetic neutral atom (ENA) emissivity that partially corrects for the global viewing geometry dependence of low-altitude emissions (LAEs) observed by Two Wide ... [more ▼]

We formulate the first analytical model for energetic neutral atom (ENA) emissivity that partially corrects for the global viewing geometry dependence of low-altitude emissions (LAEs) observed by Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS). The emissivity correction requires the pitch angle distribution (PAD) and geophysical location of low-altitude ENAs. To estimate PAD, we create an energy-dependent analytical model, based on a Monte Carlo simulation. We account for energy binning by integrating model PAD over each energy bin. We account for finite angular pixels by computing emissivity as an integral over the pitch angle range sampled by the pixel. We investigate location uncertainty in TWINS pixels by performing nine variations of the emissivity calculation. Using TWINS 2 ENA imaging data from 1131 to 1145 UT on 6 April 2010, we derive emissivity-corrected ion fluxes for two angular pixel sizes: 4° and 1°. To evaluate the method, we compare TWINS-derived ion fluxes to simultaneous in situ data from the National Oceanic and Atmospheric Administration (NOAA) 17 satellite. The TWINS-NOAA agreement for emissivity-corrected flux is improved by up to a factor of 7, compared to uncorrected flux. The highest 1° pixel fluxes are a factor of 2 higher than for 4° pixels, consistent with pixel-derived fluxes that are artificially low because subpixel structures are smoothed out, and indicating a possible slight advantage to oversampling the instrument-measured LAE signal. Both TWINS and NOAA ion fluxes decrease westward of 2000 magnetic local time. The TWINS-NOAA comparison indicates that the global ion precipitation oval comprises multiple smaller-scale (3-5° of latitude) structures. [less ▲]

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See detailAnalytical evaluation of the new Abbott Architect 25-OH vitamin D assay
CAVALIER, Etienne ULiege; CARLISI, Ignazia ULiege; BEKAERT, Anne-Catherine ULiege et al

in Clinical Biochemistry (2012), 45

Objectives: Validation of the Architect 25-OH vitamin D assay. Design and methods: Determination of repeatability, reproducibility, accuracy profile and 25(OH)-vitamin D2 recovery on native samples ... [more ▼]

Objectives: Validation of the Architect 25-OH vitamin D assay. Design and methods: Determination of repeatability, reproducibility, accuracy profile and 25(OH)-vitamin D2 recovery on native samples. Comparison with DiaSorin Liaison and RIA. Results and conclusion: Coefficients of variation: b6% (13.6 ng/mL) and 2.2% (78.1 ng/mL). Functional sensitivity: 5 ng/mL. Accuracy profile shows that the method is validated between 13.6 and 78.1 ng/mL. Recovery of 25(OH)D2: 75,8%( 95% CI: 61.9–89.7%). Good correlation with DiaSorin RIA and Liaison b50 ng/mL; above this threshold a systematic positive bias was observed. [less ▲]

Detailed reference viewed: 94 (6 ULiège)