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See detailEfficient Implicit Schemes for Transient Problems in Metal Forming Simulation
Hogge, Michel ULg; Ponthot, Jean-Philippe ULg

in Proc. of NUPHYMAT'96, Numerical and Physical Study of Material Forming Processe (1996)

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See detailAn efficient interpolation algorithm for Fourier and diffractive optics
Roose, Stéphane ULg; Brichau, Bart; Stijns, Erik

in Optics Communications (1993), 97(5-6), 312-318

An alternative algorithm for the computation of diffraction (Fourier) integrals is described. Its computation time is comparable with the computation time of an FFT-algorithm combined with zero-framing ... [more ▼]

An alternative algorithm for the computation of diffraction (Fourier) integrals is described. Its computation time is comparable with the computation time of an FFT-algorithm combined with zero-framing. On the other hand it allows a free choice of resolution, as in numerical integration. The features of this algorithm are illustrated on the calculation of a PSF of an aberrated lens. [less ▲]

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See detailEfficient lipofection of human trophoblast cells in primary cultures
Jacquemin, P.; Alsat, E.; Oury, Cécile ULg et al

in Biochemical and Biophysical Research Communications (1993), 196(1), 376-81

Human choriosomatomammotropic hormone, also known as placental lactogen, is expressed in syncytiotrophoblast cells of the placenta. Studying transcriptional regulation of the genes coding for this hormone ... [more ▼]

Human choriosomatomammotropic hormone, also known as placental lactogen, is expressed in syncytiotrophoblast cells of the placenta. Studying transcriptional regulation of the genes coding for this hormone, we became interested in transfecting primary cultures of these trophoblast cells. In this study, we show that it is possible to transfect, by the lipofection method, these giant cells in an efficient and reproducible manner. We show the presence of an enhancer region downstream from the hCS-B gene, functionally active in these cells; furthermore, we demonstrate the placenta-specific characteristic of this enhancer, previously identified in a human choriocarcinoma cell line. [less ▲]

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See detailEfficient mesh management in Eulerian-Lagrangian formulation
Ponthot, Jean-Philippe ULg

in Proceedings of NUMIFORM'89, Numerical Methods in Industrial Forming Processes (1989)

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See detailEfficient method for a controlled deposition of Pd nanoparticles on a glassy carbon electrode
Olu, Pierre-Yves; Chatenet, Marian; Job, Nathalie ULg

Poster (2014)

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See detailAn efficient method for the regeneration of wheat (Triticum aestivum) from anther cultures.
Zhang, Lihong ULg; Anceau, Christine ULg; Lepoivre, Philippe ULg et al

in Bulletin des Recherches Agronomiques de Gembloux (1987), 22(4),

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See detailAn efficient method to generate data and compute exact P-values in goodness-of-fit testing
Magis, David ULg

in Communications in Statistics : Simulation & Computation (2008), 37

In this article, we use a characterization of the set of sample counts that do not match with the null hypothesis of the test of goodness of fit. Two direct applications arise: first, to instantaneously ... [more ▼]

In this article, we use a characterization of the set of sample counts that do not match with the null hypothesis of the test of goodness of fit. Two direct applications arise: first, to instantaneously generate data sets whose corresponding asymptotic P-values belong to a certain pre-defined range; and second, to compute exact P-values for this test in an efficient way. We present both issues before illustrating them by analyzing a couple of data sets. Method’s efficiency is also assessed by means of simulations. We focus on Pearson’s X2 statistic but the case of likelihood-ratio statistic is also discussed. [less ▲]

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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 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 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 synthesis of 2,5-diketopiperazines by Staudinger-mediated cyclization
Beagle, Lucas; Hansen, Finn; Monbaliu, Jean-Christophe ULg et al

in Synlett (2012), 23(16), 2337-2340

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See detailEfficient targeted energy transfers in coupled nonlinear oscillators through 1:1 transcient resonance captures:
Sapsis, Themistoklis; Quinn, D. Dane; Gendelman, Oleg et al

in Sixth EUROMECH Nonlinear Dynamics Conference, Saint Petersbourg, 2008 (2008)

We study targeted energy transfer (TET) in a two degree-of-freedom damped system caused by 1:1 transient resonance capture (TRC). The system consists of a linear oscillator strongly coupled to an ... [more ▼]

We study targeted energy transfer (TET) in a two degree-of-freedom damped system caused by 1:1 transient resonance capture (TRC). The system consists of a linear oscillator strongly coupled to an essentially nonlinear attachment. First, we study the underlying structure of the Hamiltonian dynamics of the system, and then show that, for sufficiently small values of viscous damping, the nonlinear damped transitions are strongly influenced by the underlying topological structure of periodic and quasiperiodic orbits of the hamiltonian system. Then, a detailed computational study of the different types of nonlinear transitions that occur in the weakly damped system is presented. As a result of these studies, conditions that lead to effective or even optimal TET from the linear system to the nonlinear attachment are determined. Finally, direct analytical treatment of the governing strongly nonlinear damped equations of motion is performed through slow/fast partition of the transient responses, in order to analytically model the dynamics the region of optimal TET, and to determine the characteristic time scales of the dynamics that influence the capacity of the nonlinear attachment to passively absorb and locally dissipate broadband energy from the linear oscillator. [less ▲]

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