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See detailApplication of Laser Induced Breakdown Spectroscopy (LIBS) to the determination of transition probabilities of laser lines in Au II spectrum
Ortiz, M.; Mayo, R.; Biémont, Emile ULg et al

Conference (2007)

Experimental branching fractions for laser lines arising from excited states of 5d97s configuration of Au II have been determined by application of Laser Induced Breakdown Spectroscopy (LIBS). The ... [more ▼]

Experimental branching fractions for laser lines arising from excited states of 5d97s configuration of Au II have been determined by application of Laser Induced Breakdown Spectroscopy (LIBS). The experimental relative transition probabilities were converted into an absolute scale using theoretical values for the radiative lifetimes of the corresponding states, calculated in this work. Transition probabilities and radiative lifetimes have been determined by a relativistic Hartree - Fock method taking configuration interaction and core-polarization effects into account. A comparison of the present results with the available theoretical values has been made and shows a reasonable agreement although discrepancies are observed between theory and experiment for some transitions. [less ▲]

Detailed reference viewed: 38 (0 ULg)
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See detailApplication of lasso penalization to differential item functioning detection
Magis, David ULg

Scientific conference (2013, February 26)

Identification of differential item functioning (DIF) in dichotomously scored items is often performed item by item. This approach increases the risk of false discovery errors (Type I error rate) as all ... [more ▼]

Identification of differential item functioning (DIF) in dichotomously scored items is often performed item by item. This approach increases the risk of false discovery errors (Type I error rate) as all items other than the tested one are assumed to be free of DIF. Some ad-hoc procedures, such as item purification and alpha level adjustment for multiple comparisons, have been studied in this context. The purpose of this talk is to focus on a different approach based on penalized likelihood estimation of a look-alike IRT model. Specifically, a Rasch model is being introduced with item-group interaction terms (i.e. DIF effects). Rather than obtaining pointwise estimates of the interaction parameters, which may be impossible because of high collinearity effects, the DIF effects are estimated with a lasso penalty term. Several criteria for optimally selecting the lasso tuning parameter are discussed, including cross-validation, AIC, BIC, and variants of these criteria. Preliminary results of a simulation study are presented and discussed. [less ▲]

Detailed reference viewed: 74 (2 ULg)
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See detailApplication of Lempel-Ziv complexity to alignment-free sequence comparison of protein families
Bacha, Sofiène; Baurain, Denis ULg

Poster (2005, April)

Detailed reference viewed: 37 (3 ULg)
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See detailAn application of luminescence dating to building archaeology: The study of ceramic building materials in early medieval churches in south-eastern England and north-western France
Blain, Sophie ULg

in Arqueologia de la Arquitectura (2010), 7

The research reported in this thesis concerns the re-evaluation of an archaeological assumption surrounding the origin of Ceramic Building Materials (CBM) used from the 9th to the 11th century in ... [more ▼]

The research reported in this thesis concerns the re-evaluation of an archaeological assumption surrounding the origin of Ceramic Building Materials (CBM) used from the 9th to the 11th century in religious buildings of north-western France and south-eastern England. Are the bricks used in the masonry structures Roman spolia or a novo productions? Amongst the dating methods that can contribute to building archaeology, it is the technique of stimulated luminescence applied to CBM that is the focus of this study. Results from thermoluminescence (TL) and optically stimulated luminescence (OSL) dating performed on 52 CBM samples from 11 churches showed that the practice of reusing Roman brick was commonplace in small parish churches, but also that brick-making was not a totally unknown skill of the early medieval craftsmen as it has long been supposed. Most importantly, by identifying that the building material is contemporary to the church, a defined chronology emerges resulting in a new and extremely useful reference point in the history of early medieval architecture. [less ▲]

Detailed reference viewed: 13 (0 ULg)
See detailApplication of magnetic susceptibility on different carbonate platform type
Da Silva, Anne-Christine ULg; Boulvain, Frédéric ULg; Mabille, Cédric ULg

in Abstract book 17th ISC - Fukuoka, Japan - 2006 (2006)

Detailed reference viewed: 8 (3 ULg)
See detailapplication of magnetic susceptibility on different carbonate platform types.
Da Silva, Anne-Christine ULg

Scientific conference (2008, November 27)

Detailed reference viewed: 5 (2 ULg)
See detailApplication of magnetic susceptibility on different carbonate platforms
Da Silva, Anne-Christine ULg

Scientific conference (2010, December 13)

Detailed reference viewed: 7 (1 ULg)
See detailApplication of magnetic susceptibility on different carbonate systems
Da Silva, Anne-Christine ULg

Scientific conference (2010, February 02)

Detailed reference viewed: 5 (0 ULg)
See detailApplication of magnetic susceptibility on Palaeozoic sedimentary rocks
Spassov, Simo; Da Silva, Anne-Christine ULg; Whalen, Michael et al

in Abstract book of the IAGA 11th Scientific assembly (2009)

Detailed reference viewed: 27 (3 ULg)
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See detailApplication of magnetic susceptibility to the Maastrichtian-Eocene phosphatic deposits of Séjla section in Gafsa-Métlaoui basin (Southern Tunisia)
Akermi, Souha; Abdallah, H.; Da Silva, Anne-Christine ULg et al

in Geologica Belgica (2010, December), 13(4),

Detailed reference viewed: 47 (6 ULg)
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See detailApplication of mechanoregulatory models to simulate peri-implant tissue formation in an in vivo bone chamber
Geris, Liesbet ULg; Vandamme, Katleen; Naert, Ignace et al

in Journal of Biomechanics (2008), 41(1), 145-154

Several mechanoregulatory tissue differentiation models have been proposed over the last decade. Corroboration of these models by comparison with experimental data is necessary to determine their ... [more ▼]

Several mechanoregulatory tissue differentiation models have been proposed over the last decade. Corroboration of these models by comparison with experimental data is necessary to determine their predictive power. So far, models have been applied with various success rates to different experimental set-ups investigating mainly secondary fracture heating. In this study, the mechanoregulatory models are applied to simulate the implant osseointegration process in a repeated sampling in vivo bone chamber, placed in a rabbit tibia. This bone chamber provides a mechanically isolated environment to study tissue differentiation around titanium implants loaded in a controlled manner. For the purpose of this study, bone formation around loaded cylindrical and screw-shaped implants was investigated. Histologically, no differences were found between the two implant geometries for the global amount of bone formation in the entire chamber. However, a significantly larger amount of bone-to-implant contact was observed for the screw-shaped implant compared to the cylindrical implant. In the simulations, a larger amount of bone was also predicted to be in contact with the screw-shaped implant. However, other experimental observations could not be predicted. The simulation results showed a distribution of cartilage, fibrous tissue and (im)mature bone, depending on the mechanoregulatory model that was applied. In reality, no cartilage was observed. Adaptations to the differentiation models did not lead to a better correlation between experimentally observed and numerically predicted tissue distribution patterns. The hypothesis that the existing mechanoregulatory models were able to predict the patterns of tissue formation in the in vivo bone chamber could not be fully sustained. (c) 2007 Elsevier Ltd. All rights reserved. [less ▲]

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See detailApplication of Metabolomic Approaches to the Age-related Macular Degeneration (AMD)
De Tullio, Pascal ULg

Conference (2009, January 30)

Detailed reference viewed: 18 (1 ULg)