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Search Results: 1 - 10 of 175481 matches for " Mathieu De?Maeyer "
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Cartographie de la croissance urbaine de Kinshasa (R.D. Congo) entre 1995 et 2005 par télédétection satellitaire à haute résolution The mapping of the urban growth of Kinshasa (DRC) through high resolution remote sensing between 1995 and 2005
Matthieu Kayembe?Wa?Kayembe,Mathieu DeMaeyer,Eléonore Wolff
Belgeo : Revue Belge de Géographie , 2013,
Abstract: La croissance spatiale de Kinshasa (RDC) est cartographiée par classification des espaces batis au départ d’images satellitaires SPOT datant de 1995 et 2005. D’après les résultats, la croissance de la ville est moins rapide que l’évolution démographique ; elle s’effectue désormais dans les espaces interstitiels en dépit de leurs fortes pentes et d’un certain éloignement des principales voies de communication (au delà d’1 km). The urban growth of Kinshasa (DRC) is mapped by classification of built-up areas using SPOT images dating from 1995 and 2005. From the results, the city growth is slower than the population growth; it is taking place within interstitial areas despite their steep slopes and their distance (1 km) from the main communication axes.
A educa??o na pris?o n?o é uma mera atividade
Maeyer, Marc De;
Educa??o & Realidade , 2013, DOI: 10.1590/S2175-62362013000100004
Abstract: education and prison have always formed an incoherent pair: the first, finding its universal reasons in the particular context of the second, which, by its nature, offers only a contradictory frame for the free expression of the first one. how can prison, being anti-educative by itself, offer people an opportunity to explore useful knowledge from now until the day they are released? we will try to demonstrate that, amidst these contradictions, education is possible with the proviso that it is effectively an education for life, and not only instruction or reeducation.
De provincie: taai ongerief of onmisbaar bindmiddel. De Arena. De taaiheid van de provincie
Karel Davids,Jan De Maeyer
BMGN : Low Countries Historical Review , 2008,
Coordinating sentence composition with error correction: A multilevel analysis
Leijten, M.,De Maeyer, S.,Van Waes, L.
Journal of Writing Research , 2011,
Abstract: Error analysis involves detecting and correcting discrepancies between the 'text produced so far' (TPSF) and the writer's mental representation of what the text should be. While many factors determine the choice of strategy, cognitive effort is a major contributor to this choice. This research shows how cognitive effort during error analysis affects strategy choice and success as measured by a series of online text production measures. We hypothesize that error correction with speech recognition software differs from error correction with keyboard for two reasons. Speech produces auditory commands and, consequently, different error types. The study reported on here measured the effects of (1) mode of presentation (auditory or visual-tactile), (2) error span, whether the error spans more or less than two characters, and (3) lexicality, whether the text error comprises an existing word. A multilevel analysis was conducted to take into account the hierarchical nature of these data. For each variable (interference reaction time, preparation time, production time, immediacy of error correction, and accuracy of error correction), multilevel regression models are presented. As such, we take into account possible disturbing person characteristics while testing the effect of the different conditions and error types at the sentence level.The results show that writers delay error correction more often when the TPSF is read out aloud first. The auditory property of speech seems to free resources for the primary task of writing, i.e. text production. Moreover, the results show that large errors in the TPSF require more cognitive effort, and are solved with a higher accuracy than small errors. The latter also holds for the correction of small errors that result in non-existing words.
Examining the Cross-Cultural Sensitivity of the Revised Two-Factor Study Process Questionnaire (R-SPQ-2F) and Validation of a Dutch Version
Ann Stes, Sven De Maeyer, Peter Van Petegem
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0054099
Abstract: The Revised Two-Factor Study Process Questionnaire (R-SPQ-2F) is used to examine students’ study approaches in higher education. The questionnaire assumes to measure two factors: a deep and a surface study approach. Analyses into the validity and reliability of the original English R-SPQ-2F yielded positive results. In this study, we examined the degree to which these positive results can also be found for the Dutch version that we developed. By comparing our results with the results of earlier studies in different cultures, we conclude cross-cultural sensitivity is an important point to be borne in mind when using the R-SPQ-2F. Our research supports the validity and reliability of our Dutch version of the R-SPQ-2F.
pKa Modulation of the Acid/Base Catalyst within GH32 and GH68: A Role in Substrate/Inhibitor Specificity?
Shuguang Yuan, Katrien Le Roy, Tom Venken, Willem Lammens, Wim Van den Ende, Marc De Maeyer
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0037453
Abstract: Glycoside hydrolases of families 32 (GH32) and 68 (GH68) belong to clan GH-J, containing hydrolytic enzymes (sucrose/fructans as donor substrates) and fructosyltransferases (sucrose/fructans as donor and acceptor substrates). In GH32 members, some of the sugar substrates can also function as inhibitors, this regulatory aspect further adding to the complexity in enzyme functionalities within this family. Although 3D structural information becomes increasingly available within this clan and huge progress has been made on structure-function relationships, it is not clear why some sugars bind as inhibitors without being catalyzed. Conserved aspartate and glutamate residues are well known to act as nucleophile and acid/bases within this clan. Based on the available 3D structures of enzymes and enzyme-ligand complexes as well as docking simulations, we calculated the pKa of the acid-base before and after substrate binding. The obtained results strongly suggest that most GH-J members show an acid-base catalyst that is not sufficiently protonated before ligand entrance, while the acid-base can be fully protonated when a substrate, but not an inhibitor, enters the catalytic pocket. This provides a new mechanistic insight aiming at understanding the complex substrate and inhibitor specificities observed within the GH-J clan. Moreover, besides the effect of substrate entrance on its own, we strongly suggest that a highly conserved arginine residue (in the RDP motif) rather than the previously proposed Tyr motif (not conserved) provides the proton to increase the pKa of the acid-base catalyst.
Modeling Change in Learning Strategies throughout Higher Education: A Multi-Indicator Latent Growth Perspective
Liesje Coertjens, Vincent Donche, Sven De Maeyer, Gert Vanthournout, Peter Van Petegem
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0067854
Abstract: The change in learning strategies during higher education is an important topic of research in the Student Approaches to Learning field. Although the studies on this topic are increasingly longitudinal, analyses have continued to rely primarily on traditional statistical methods. The present research is innovative in the way it uses a multi-indicator latent growth analysis in order to more accurately estimate the general and differential development in learning strategy scales. Moreover, the predictive strength of the latent growth models are estimated. The sample consists of one cohort of Flemish University College students, 245 of whom participated in the three measurement waves by filling out the processing and regulation strategies scales of the Inventory of Learning Styles – Short Versions. Independent-samples t-tests revealed that the longitudinal group is a non-random subset of students starting University College. For each scale, a multi-indicator latent growth model is estimated using Mplus 6.1. Results suggest that, on average, during higher education, students persisting in their studies in a non-delayed manner seem to shift towards high-quality learning and away from undirected and surface-oriented learning. Moreover, students from the longitudinal group are found to vary in their initial levels, while, unexpectedly, not in their change over time. Although the growth models fit the data well, significant residual variances in the latent factors remain.
The Galactic Sky seen by H.E.S.S
Mathieu de Naurois
Physics , 2011, DOI: 10.1016/j.asr.2011.04.009
Abstract: The H.E.S.S. experiment is an array of four imaging Cherenkov telescopes located in the Khomas Highlands of Namibia. It has been operating in its full configuration since December 2003 and detects very-high-energy (VHE) gamma rays ranging from 100 GeV to 50 TeV. Since 2004, the continuous observation of the Galactic Plane by the H.E.S.S. array of telescopes has yielded the discovery of more than 50 sources, belonging to the classes of pulsar wind nebulae (PWN), supernova remnants (SNR), gamma ray binaries and, more recently, a stellar cluster and molecular clouds in the vicinity of shell-type SNRs. Galactic emission seen by H.E.S.S. and its implications for particle acceleration in our Galaxy are discussed.
Mapping the Binding Interface between an HIV-1 Inhibiting Intrabody and the Viral Protein Rev
Thomas Vercruysse, Eline Boons, Tom Venken, Els Vanstreels, Arnout Voet, Jan Steyaert, Marc De Maeyer, Dirk Daelemans
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0060259
Abstract: HIV-1 Rev is the key protein in the nucleocytoplasmic export and expression of the late viral mRNAs. An important aspect for its function is its ability to multimerize on these mRNAs. We have recently identified a llama single-domain antibody (Nb190) as the first inhibitor targeting the Rev multimerization function in cells. This nanobody is a potent intracellular antibody that efficiently inhibits HIV-1 viral production. In order to gain insight into the Nb190-Rev interaction interface, we performed mutational and docking studies to map the interface between the nanobody paratope and the Rev epitope. Alanine mutants of the hyper-variable domains of Nb190 and the Rev multimerization domains were evaluated in different assays measuring Nb190-Rev interaction or viral production. Seven residues within Nb190 and five Rev residues are demonstrated to be crucial for epitope recognition. These experimental data were used to perform docking experiments and map the Nb190-Rev structural interface. This Nb190-Rev interaction model can guide further studies of the Nb190 effect on HIV-1 Rev function and could serve as starting point for the rational development of smaller entities binding to the Nb190 epitope, aimed at interfering with protein-protein interactions of the Rev N-terminal domain.
Characterization of Reinforced Carbon Composites with Full Field Measurements: Long Gauge Length Compressive Apparatus  [PDF]
Mathieu Colin de Verdiere, Alexandros A. Skordos, Andrew Walton
Open Journal of Composite Materials (OJCM) , 2013, DOI: 10.4236/ojcm.2013.31002

A new compressive testing apparatus is developed and used in this research. It has long gauge length to allow digital image correlation monitoring and anti buckling guides to prevent buckling. It allows the optical recording of strains and displacements. The novel setup is used to study the compressive response of tufted and untufted Carbon non crimp fabric composites with full field measurements. Experimental results show that the specimens are not bending in the apparatus under compression. Results also show reduced strain concentrations and a large strain field that provides a good environment for material compressive stiffness characterization. The test proves particularly successful for bias direction layup of [+45/-45] for which large damage mechanism occurs. However for [0/90] specimens a scatter in compressive ultimate strength was noticed which is due to the difficulty to prepare specimens with best minute accurate geometry. The compressive apparatus has shown to be a good alternative to existing setups and to provide significantly more information as well as having the possibility to be used in dynamics with a drop tower.

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