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See detailEfficient methods for large-scale time-harmonic wave simulations
Marsic, Nicolas ULg

Doctoral thesis (2016)

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See detailEfficient microwave-promoted synthesis of glucuronic and galacturonic acid derivatives using sulfuric acid impregnated on silica
Richel, Aurore ULg; Nicks, Francois ULg; Laurent, Pascal ULg et al

in Green Chemistry Letters & Reviews (2012), 5(2), 179-186

Monomode microwave-assisted syntheses of D-glucuronic and D-galacturonic acid derivatives are reported in the presence of a solid acid catalyst, consisting of sulfuric acid loaded onto silica. This ... [more ▼]

Monomode microwave-assisted syntheses of D-glucuronic and D-galacturonic acid derivatives are reported in the presence of a solid acid catalyst, consisting of sulfuric acid loaded onto silica. This approach affords a variety of surface-active monoglycosylated glucofuranosidurono-6,3-lactones and disubstituted galacturonic adducts in excellent yields in less than 10 min at 85 °C. This study illustrates the application of microwave heating mode, in combination with a cost-effective solid catalyst, as an efficient, selective and eco-friendly methodology in carbohydrate chemistry. [less ▲]

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See detailAn Efficient Numerical Model for the Numerical Simulation of Forming Processes
Ponthot, Jean-Philippe ULg; Boman, Romain ULg; Papeleux, Luc ULg et al

in Khan, Akhtar; Farrokh, Babak (Eds.) Mechanics and Mechanisms of Finite Plastic Deformation : Proceedings of PLASTICITY'08, Fourteenth International Symposium on Plasticity and its Current Applications (2008, January)

In this paper, the Arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 2D metal cutting operation and a 3D U-shaped cold roll forming process. Compared to the Lagrangian case ... [more ▼]

In this paper, the Arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 2D metal cutting operation and a 3D U-shaped cold roll forming process. Compared to the Lagrangian case, this method allows the use of a refined mesh near the tools, leading to an accurate representation of the chip formation (metal cutting) and the bending of the sheet (roll forming) with a limited computational time. [less ▲]

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See detailEfficient one-pot synthesis of trans- Pt(II)(salicylaldimine)(4-picoline)Cl complexes: Effective agents for enhanced expression of p53 tumor suppressor genes
Faiz-Ur-Rahman; Ali, Amjad ULg; Rong Guo et al

in Dalton Transactions (2015)

A series of trans-Pt(II)(salicylaldimine)(4-picoline)Cl complexes were synthesized in 78‒87% yield using one-pot procedure from commercially available precursors. The structures of these complexes were ... [more ▼]

A series of trans-Pt(II)(salicylaldimine)(4-picoline)Cl complexes were synthesized in 78‒87% yield using one-pot procedure from commercially available precursors. The structures of these complexes were characterized by 1H, 19F and 13C NMR spectroscopy, HRMS (ESI) as well as single crystal X-ray analysis. Bioactivity investigations including bio-assay, time- and dosedependent, cell cycle progression study, caspase 3 and 9 apoptosis marker assay and DNA interaction using pBR322 plasmid DNA by gel electrophoresis were performed. The results indicated that the complexes showed promising in vitro cytotoxicity in MCF-7 and A549 cancer cell lines. Moreover these complexes enhanced the expression of p53 tumor suppressor gene family members such as p63 and p73. [less ▲]

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See detailEfficient P- and Ag-doped titania for the photocatalytic degradation of waste water organic pollutants
Bodson, Céline ULg; Heinrichs, Benoît ULg; Tasseroul, Ludivine ULg et al

in Journal of Alloys & Compounds (2016), 682

In this work, physico-chemical properties and photocatalytic activity of three types of dried or dried and calcined TiO2 materials, synthesized by the cogelation method, were studied: (i) a pure TiO2 ... [more ▼]

In this work, physico-chemical properties and photocatalytic activity of three types of dried or dried and calcined TiO2 materials, synthesized by the cogelation method, were studied: (i) a pure TiO2 xerogel ; (ii) TiO2 xerogels doped with Ag ; (iii) TiO2 xerogels co-doped with Ag and P. The presence of silver nanoparticles was observed by transmission electron microscopy (TEM) and the oxidation state of silver after calcination was examined by temperature-programmed reduction (TPR) measurements. The physico-chemical properties of xerogels were characterized by X-ray diffraction (XRD), diffuse reflectance UV-Vis spectroscopy (DR UV-Vis) and from nitrogen adsorption-desorption isotherms. The photocatalytic activity of the samples was quantified for the p-nitrophenol degradation under visible light. [less ▲]

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See detailEfficient Path Interpolation and Speed Profile Computation for Nonholonomic Mobile Robots
Lens, Stéphane ULg; Boigelot, Bernard ULg

E-print/Working paper (2015)

This paper studies path synthesis for nonholonomic mobile robots moving in two-dimensional space. We first address the problem of interpolating paths expressed as sequences of straight line segments, such ... [more ▼]

This paper studies path synthesis for nonholonomic mobile robots moving in two-dimensional space. We first address the problem of interpolating paths expressed as sequences of straight line segments, such as those produced by some planning algorithms, into smooth curves that can be followed without stopping. Our solution has the advantage of being simpler than other existing approaches, and has a low computational cost that allows a real-time implementation. It produces discretized paths on which curvature and variation of curvature are bounded at all points, and preserves obstacle clearance. Then, we consider the problem of computing a time-optimal speed profile for such paths. We introduce an algorithm that solves this problem in linear time, and that is able to take into account a broader class of physical constraints than other solutions. Our contributions have been implemented and evaluated in the framework of the Eurobot contest. [less ▲]

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See detailEfficient Path Planning for Nonholonomic Mobile Robots
Lens, Stéphane ULg; Boigelot, Bernard ULg

Report (2014)

This work addresses path planning for nonholonomic robots moving in two-dimensional space. The problem consists in computing a sequence of line segments that leads from the current configuration of the ... [more ▼]

This work addresses path planning for nonholonomic robots moving in two-dimensional space. The problem consists in computing a sequence of line segments that leads from the current configuration of the robot to a target location, while avoiding a given set of obstacles. We describe a planning algorithm that has the advantage of being very efficient, requiring less of one millisecond of CPU time for the case studies that we have considered, and produces short paths. Our method relies on a search in a Voronoi graph that characterizes the possible ways of moving around obstacles, followed by a string-pulling procedure aimed at improving the resulting path. [less ▲]

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See detailAn efficient procedure for the production of fatty acid hydroperoxides from hydrolyzed flax seed oil and soybean lipoxygenase.
Fauconnier, Marie-Laure ULg; Marlier, M.

in biotechnology techniques (1996), 10(11), 839-844

Production of 13-linolenic acid hydroperoxides Tom hydrolyzed flax seed oil using lipoxygenase extracted Tom soybean seedshas been achieved with high transformation yields (60 g.l.-1h-1) with a high ... [more ▼]

Production of 13-linolenic acid hydroperoxides Tom hydrolyzed flax seed oil using lipoxygenase extracted Tom soybean seedshas been achieved with high transformation yields (60 g.l.-1h-1) with a high purity (94 % of i3-isomers) in a 10 liter reactor without addition of any solvent or surfactant. The reaction limiting factor is, probably, the accessibility of the substrate to the enzyme. [less ▲]

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See detailEfficient Pt/carbon electrocatalysts for Proton Exchange Membrane fuel cells: avoid chloride-based Pt salts !
Job, Nathalie ULg; Chatenet, Marian; Berthon-Fabry, Sandrine et al

in Journal of Power Sources (2013), 240

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See detailEfficient real-time control of a robot simulator with brain waves
Grave de Peralta, R.; Noirhomme, Quentin ULg; Vanacker, G. et al

in Proceedings of BCI Meets HCI Workshop (2007)

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See detailEfficient refolding of a recombinant abzyme : Structural and catalytic characterizations.
Ben Naya, Raouia; Matti, Kalyankumar; Guellier, Adeline et al

in Applied Microbiology & Biotechnology (2013), 97(17), 7721-31

Catalytic antibodies are currently being investigated in order to understand their role under physio-pathological situations. To this end, the knowledge of structure-function relationships is of great ... [more ▼]

Catalytic antibodies are currently being investigated in order to understand their role under physio-pathological situations. To this end, the knowledge of structure-function relationships is of great interest. Recombinant scFv fragments are smaller and easier to genetically manipulate than whole antibodies, making them well suited for this kind of study. Nevertheless they are often described as proteins being laborious to produce. This paper describes a highly efficient method to produce large quantities of refolded soluble catalytic scFv. For the first time, the functionality of a refolded catalytic scFv displaying a beta-lactamase activity has been validated by three approaches: (1) use of circular dichroism to ensure that the refolded had secondary structure consistent with a native scFv fold, (2) development of enzyme-linked immunosorbant assay and surface plasmon resonance (SPR) approaches for testing that the binding characteristics of an inhibitory peptide have been retained, and (3) proof of the subtle catalytic properties conservation through the development of a new sensitive catalytic assay using a fluorogenic substrate. [less ▲]

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See detailAn Efficient Representation Format for Fuzzy Intervals Based on Symmetric Membership Functions
Marin, Manuel ULg; Defour, David; Milano, Federico

in ACM Trans. Math. Softw. (2016), 43(3), 231--2322

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See detailAn Efficient Sampling Technique Used to Detect Four Foodborne Pathogens on Pork and Beef Carcasses in Nine Belgian Abattoirs
Korsak Koulagenko, Nicolas ULg; Daube, Georges ULg; Ghafir, Yasmine et al

in Journal of Food Protection (1998), 61(5), 535-541

The method presented in this paper should prove useful in assessing the effectiveness of HACCP plans developed in slaughterhouses. Samples were collected by swabbing well-defined areas of pork and beef ... [more ▼]

The method presented in this paper should prove useful in assessing the effectiveness of HACCP plans developed in slaughterhouses. Samples were collected by swabbing well-defined areas of pork and beef carcasses with sterile gauze. Between 160 and 420 half-carcasses were swabbed in each of nine pork or beef slaughterhouses. Swabs from five carcasses were placed in the same sterile Stomacher bag, constituting a single composite sample. Standard or validated analytical methods were used to isolate and characterize four foodborne pathogens. Salmonella spp., Listeria monocytogenes, Campylobacter spp., and verocytotoxin-producing E. coli were detected, respectively, in 27, 2, 2, and 14% of the pork samples and 0, 22, 10, and 5% of the beef samples. Of the 10 samples positive for E. coli O157, only one yielded an isolate confirmed to be enterohemorrhagic. Since Salmonella spp. appear as the main contaminant port (27%) and L. monocytogenes as the main containment of beef (22%), any slaughterhouse sampling plan should include testing for the former in the case of pork carcasses and for the latter in the case of beef carcasses. One should also test regularly for the presence of E. coli O157 and Campylobacter spp. in pork and beef abattoirs. The method presented here is an easy way to assess the contamination rate of carcasses at the end of the slaughtering process. [less ▲]

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See detailAn efficient simulation tool for predicting chatter during cutting operations
Le Lan, Jean-Vincent; Masset, Luc ULg; Marty, Audrey et al

Conference (2006, April)

The trends in chatter prediction are to compute stability lobes showing the maximal depth of cut versus spindle speed, following the work of Tlusty, Tobias and, more recently, Altintas. For mass ... [more ▼]

The trends in chatter prediction are to compute stability lobes showing the maximal depth of cut versus spindle speed, following the work of Tlusty, Tobias and, more recently, Altintas. For mass production such as the production of automotive parts, this kind of approach is not suitable because the goal is to find cutting conditions stable and independent of perturbations inherent to machining (clamping, rough part dimensions...). Still, in this method, the greatest allowable depth of cut to avoid chatter at any spindle speed is considered. The model is based on Tlusty's theory and the local stiffness of the machined surface is computed through a static finite element analysis. The result is a chatter map of the machined surface showing the maximal depth of cut at each node. [less ▲]

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See detailEfficient sludge thermal processing: from drying to thermal valorisation
Arlabosse, Patricia; Ferrasse, J. H.; Lecomte, D. et al

in Tsotsas, E.; Mujumdar, A. S. (Eds.) Modern Drying Technology, Vol 4. Energy savings (2012)

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See detailEfficient springback prediction based on Enhanced Assumed Strain Elements
BUI, Q. V.; Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in Proceedings of COMPLAS 2003, VII International Conference on Computational Plasticity. Fundamentals and Applications (2003, April)

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See detailAn efficient standard error formula for the weighted likelihood estimator of ability
Magis, David ULg

Scientific conference (2014, March 04)

The weighted likelihood estimator (WLE; Warm, 1989) has become a very popular ability estimator in item response theory. It was developed to basically cancel the estimation bias of the maximum likelihood ... [more ▼]

The weighted likelihood estimator (WLE; Warm, 1989) has become a very popular ability estimator in item response theory. It was developed to basically cancel the estimation bias of the maximum likelihood estimator (MLE) with short tests. However, some uncertainty remains about its standard error formula. Warm (1989) established the asymptotic equivalence of the standard errors of both MLE and WLE, but there exists actually various practical formulas for the latter (Magis & Raîche, 2012; Nydick, 2013; Partchev, 2012; Warm, 2007), leading obviously to confusion. The purpose of this talk is to briefly sketch a general approach to derive a first-order approximation of the standard error of the WLE. Based on asymptotic adjustments of the law of large numbers and central limit theorem, a simple formula is derived. The efficiency of the latter is compared to aforementioned formulas by means of a simulation study under Rasch modeling. Preliminary results indicate that the derived formula has lower bias and RMSE than any other competing formula, especially with short tests. All formulas behave similarly with longer tests, as expected. [less ▲]

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See detailEfficient standard error formulas of ability estimators in item response theory
Magis, David ULg

Conference (2015, October 15)

This talk focuses on the computation of asymptotic standard errors (ASE) of ability estimators with dichotomous item response models. A general framework is considered, and ability estimators are defined ... [more ▼]

This talk focuses on the computation of asymptotic standard errors (ASE) of ability estimators with dichotomous item response models. A general framework is considered, and ability estimators are defined from a very restricted set of assumptions and formulas. This approach encompasses most standard methods such as maximum likelihood, weighted likelihood, maximum a posteriori, and robust estimators. A general formula for the ASE is derived from the theory of M-estimation. Well-known results are found back as particular cases for the maximum and robust estimators, while new ASE proposals for the weighted likelihood and maximum a posteriori estimators are presented. These new formulas are compared to traditional ones by means of a simulation study under Rasch modeling. [less ▲]

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See detailEfficient standard error formulas of ability estimators with dichotomous item response models
Magis, David ULg

in Psychometrika (2016), 81

This paper focuses on the computation of asymptotic standard errors (ASE) of ability estimators with dichotomous item response models. A general framework is considered and ability estimators are defined ... [more ▼]

This paper focuses on the computation of asymptotic standard errors (ASE) of ability estimators with dichotomous item response models. A general framework is considered and ability estimators are defined from a very restricted set of assumptions and formulas. This approach encompasses most standard methods such as maximum likelihood, weighted likelihood, maximum a posteriori and robust estimators. A general formula for the ASE is derived from the theory of M-estimation. Well-known results are found back as particular cases for the maximum and robust estimators, while new ASE proposals for the weighted likelihood and maximum a posteriori estimators are presented. These new formulas are compared to traditional ones by means of a simulation study under Rasch modeling. [less ▲]

Detailed reference viewed: 24 (6 ULg)