Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailOn the difficulty of relational concepts among participants with Down syndrome
Facon, Bruno; Magis, David ULg; Courbois, Yannick

in Research in Developmental Disabilities (2012), 33

The aim of the study was to compare the difficulty of relational concepts among participants with and without intellectual disability. The French versions of the Boehm Tests of Basic Concepts Third ... [more ▼]

The aim of the study was to compare the difficulty of relational concepts among participants with and without intellectual disability. The French versions of the Boehm Tests of Basic Concepts Third Edition (Preschool and Kindergarten to 2nd grade) were administered to three groups of 47 participants individually matched on their total raw score on the tests. The first group comprised participants with intellectual disability of undifferentiated etiology, the second, participants with Down syndrome and the third, typical children. Item analyses using the transformed item difficulties method to detect differential item functioning across groups showed that the groups' rank-orders of item difficulty were highly similar. It is concluded that, all things being equal, relational concepts are of comparable difficulty and follow a similar sequence of development whatever the cognitive and etiological status of participants. Methodological and theoretical implications of these findings are discussed. [less ▲]

Detailed reference viewed: 7 (3 ULg)
Peer Reviewed
See detailOn the disruptive potential of 3D printing
Delvenne, Pierre ULg; Vigneron, Lara ULg

in Stokes, Elen (Ed.) Embedding and Governing New Technologies: A Regulatory, Ethical & Societal Perspective (2015)

Against the background of narratives fuelling big promises on the disruptive potential of 3D printing, this chapter seeks to describe a variety of contexts in which 3D printing technologies are expected ... [more ▼]

Against the background of narratives fuelling big promises on the disruptive potential of 3D printing, this chapter seeks to describe a variety of contexts in which 3D printing technologies are expected to emerge over the next 15 years and exert their so-called disruptive potential. In the section 2, we first provide a brief introduction to 3D printing and we explain how it actually works. Next, in section 3, we describe the paradigmatic change allowed by 3D printing in the industrial sector with a shift toward mass-customization. In particular, we focus on the biomedical sector (section 3.1.), which is an interesting case in point because of the important number of innovations and the growth of 3D printed biomedical parts, a trend which is expected to continue in the future. To account for the dramatic, transversal, and transformative potential that 3D printing has in that whole sector, we first concentrate on 3D printing of biomedical instruments and implants for patients (section 3.1.1.) and, second, on additive bio- manufacturing of human tissues and organs (section 3.1.2.). Then, in the subsequent section 4 we address the expectations raised by 3D printing to empowering users in non-industrial domains (e.g. in fabrication laboratories or with desktop 3D printers at home). In section 5, we turn to discussing the impact of 3D printing on the governance actors and we raise important issues for further research in the political economy of 3D printing technologies. The chapter posits that 3D printing, and its governance, are closely associated with more participatory means of manufacturing (and of decision- making, through various governance structures) – but that, as things currently stand, such openness and participation does not play out in practice. There is a distinction between the rhetoric and reality of 3D printing, as one might expect in the case of newly emerging technologies. [less ▲]

Detailed reference viewed: 29 (0 ULg)
Full Text
Peer Reviewed
See detailOn the distribution of the absorbing atoms in the reversing layers of stars and the formation of blended absorption lines
Swings, Polydore ULg; Chandrasekhar, S.

in Monthly Notices of the Royal Astronomical Society (1936), 97(1), 24-37

Detailed reference viewed: 6 (1 ULg)
Peer Reviewed
See detailOn the dynamic stability of Saturn's F ring
Poulet, F.; Jancart, Sylvie ULg

in Bulletin of the American Astronomical Society (2000, May 01)

We explore the dynamics of Saturn's F ring by following the orbital histories of circumplanetary particles between the orbits of Prometheus and Pandora. Our goal is to find structures that could be ... [more ▼]

We explore the dynamics of Saturn's F ring by following the orbital histories of circumplanetary particles between the orbits of Prometheus and Pandora. Our goal is to find structures that could be related to the F ring. Using a 3-D mapping integrator developped by Sicardy and Foryta (1996), we follow the behavior of several thousand test particles distributed unformly between 140,000 and 140,400 km in order to acquire a general picture of the dynamics of this zone. The model includes the gravitational effects of Saturn (up to J[SUB]4[/SUB]) and the two shepherd satellites. The numerical simulations show chaotic behaviors of the particles resulting in a close encounter with one or the other of the satellites, which deplete the zone between the satellites. The timescale over which particles are removed by the satellites is of order a ten thousand years. After a hundred thousand years, some particles exist but they are not related to the actual four strands of the F ring. As suggested by Cuzzi and Burns (1988), these simulations indicate that this ring may be a transient event occuring at the edge of the Roche limit. However, taking into account dissipation (collisions, viscosity) might help to explain the longevity and the location of this ring. This work was performed while the author held a National Research Council - NASA ARC Research Associateship. [less ▲]

Detailed reference viewed: 5 (1 ULg)
Full Text
Peer Reviewed
See detailOn the Dynamics of Locators in LISP
Saucez, Damien; Donnet, Benoît ULg

in IFIP/TC6 Networking (2012, May)

In the Internet, IP addresses play the dual role of identifying the hosts and locating them on the topology. This design choice limits the way a network can control its traffic and causes scalability ... [more ▼]

In the Internet, IP addresses play the dual role of identifying the hosts and locating them on the topology. This design choice limits the way a network can control its traffic and causes scalability issues. To overcome this limitation, the Locator/Identifier Separation Protocol (LISP) has been introduced. In LISP, the addresses used to identify end hosts (i.e., identifiers) are independent of the addresses used to locate them (i.e., locators). LISP maps identifiers into a list of locators and provides a mean to transport the packets with the appropriate locator. A key feature of this separation is that several locators can be associated to a given identifier, leading to more control for an end-site on the path selection to reach a given destination. In this paper, we show that the choice of the locator can have an impact on the performance and the reliability of the communication in a LISP environment. To this aim, we build a mapping between identifiers and locators as if LISP were deployed today. In addition, we extensively collect delay data between locators and demonstrate that the locator selection for a given identifier prefix impacts the performance of the LISP path in 25% of the cases. Finally, we measure the locators availability over time and demonstrate that it remains quite stable. [less ▲]

Detailed reference viewed: 48 (10 ULg)
See detailOn the Edge of Genre: The Prose Poem and the Short Short Story
Delville, Michel ULg

in Pagnoulle, Christine (Ed.) Writing (On) Short Stories (1997)

Detailed reference viewed: 24 (2 ULg)
See detailOn the effect of concrete surface roughness on stress wave propagation in repair systems
Piotrowski, T.; Garbacz, A.; Schwall, D. et al

in Adhesion in Interfaces of Building Materials: a Multi-Scale Approach (2007)

Detailed reference viewed: 26 (6 ULg)
Full Text
Peer Reviewed
See detailOn the effectiveness of virtualization-based security
Gadaleta, Francesco ULg; Strackx, Raoul; Nikiforakis, Nick et al

in IT Security, Freiburg (Germany), 07-10 May 2012 (2012)

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailOn the effects of inhomogeneities in high excitation H II regions
Manfroid, Jean ULg

in Astrophysics & Space Science (1978), 53

The hypothesis that observations of inhomogeneities in H II regions would be changed by adopting a filling factor other than one is investigated by comparing models of H II regions with filling factors of ... [more ▼]

The hypothesis that observations of inhomogeneities in H II regions would be changed by adopting a filling factor other than one is investigated by comparing models of H II regions with filling factors of one and one eighth. Attention is given to conditions when the hydrogen and helium fronts are close together, i.e. high excitation H II regions. Results obtained through use of an iterative scheme, whereby the nebula is divided into concentric shells with variable thickness, indicate that some emission lines, e.g., O II, S II, S III, N II, are substantially altered when the filling factor is smaller than one [less ▲]

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailOn the Elasto-viscoplastic behavior of the Ti5553 alloy
ben bettaieb, Mohamed; Van Hoof, Thibaut; Pardoen, thomas et al

in Materials Science & Engineering : A (2014), 617

The elastoviscoplastic behavior of the Ti533 alloy is characterized and compared to the classical Ti-6A14V alloy. The true stress-strain curves are determined based on tensile tests performes under ... [more ▼]

The elastoviscoplastic behavior of the Ti533 alloy is characterized and compared to the classical Ti-6A14V alloy. The true stress-strain curves are determined based on tensile tests performes under different strain rates at room temperature and at 150°C, from which the elastic constants and the parameters of a Norton-Hoff viscoplastic model are identified. The strength of the Ti5553 alloy is 20-40% higherthan the strength of the Ti-6A1-4V alloy. The Ti5553 alloy constitutes thus a promising candidate for advanced structural applications. In view of modeling structural applications of forming operations, the elastic and plastic initial anisotropy of the two alloys is investigated by combining compression on cylinders with elliptical sections, uniaxial tensile tests in different material directions , plane strain and shear tests. The initial anisotropy of the different alloys is very weak which justifies the modeling of the mechanical behavior with isotropic yield surface. The identified elastoviscoplastic model is validated by comparing experimental results with FE predictions both on cylindrical specimens subjected to tensile tests and on flat specimens subjected to plane strain conditions. [less ▲]

Detailed reference viewed: 44 (21 ULg)
Full Text
Peer Reviewed
See detailOn the electrochemical polymerization of acrylonitrile and N-vinylpyrrolidone : new insight into the mechanism
Jérôme, Robert ULg; Mertens, Marc; Martinot, Lucien

in Advanced Materials (1995), 7(9), 807-809

The protection of metals against environmental attack can be achieved by coating the metal with a protective organic film. Poor adhesion of the organic film to the metal surface has, however, limited the ... [more ▼]

The protection of metals against environmental attack can be achieved by coating the metal with a protective organic film. Poor adhesion of the organic film to the metal surface has, however, limited the success of this approach. Here it is demonstrated that polyacrylonitride can be elecrografted onto a nickel surface producing a strongly adherent film. The transformation of the organic film could also open the way to new polymer-metal composites. [less ▲]

Detailed reference viewed: 42 (2 ULg)
Full Text
See detailOn the embryonic form of Nematobothrium filarina
Van Beneden, Édouard ULg

in Quarterly Journal of Microscopical Science (The) (1870), 2(10), 136-143

Detailed reference viewed: 11 (0 ULg)
Full Text
See detailOn the emission lines in the spectrum of BD +20° 2465
Swings, Polydore ULg; Struve, Otto

in Publications of the Astronomical Society of the Pacific [=PASP] (1941), 53

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailOn the Emission Spectrum of Orion
Manfroid, Jean ULg

in Astronomy and Astrophysics (1977), 57

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1977A&A....57..303M

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailOn the Encoding of Proteins for Disordered Regions Prediction
Becker, Julien ULg; Maes, Francis; Wehenkel, Louis ULg

in PLoS ONE (2013)

Disordered regions, i.e., regions of proteins that do not adopt a stable three-dimensional structure, have been shown to play various and critical roles in many biological processes. Predicting and ... [more ▼]

Disordered regions, i.e., regions of proteins that do not adopt a stable three-dimensional structure, have been shown to play various and critical roles in many biological processes. Predicting and understanding their formation is therefore a key sub-problem of protein structure and function inference. A wide range of machine learning approaches have been developed to automatically predict disordered regions of proteins. One key factor of the success of these methods is the way in which protein information is encoded into features. Recently, we have proposed a systematic methodology to study the relevance of various feature encodings in the context of disulfide connectivity pattern prediction. In the present paper, we adapt this methodology to the problem of predicting disordered regions and assess it on proteins from the 10th CASP competition, as well as on a very large subset of proteins extracted from PDB. Our results, obtained with ensembles of extremely randomized trees, highlight a novel feature function encoding the proximity of residues according to their accessibility to the solvent, which is playing the second most important role in the prediction of disordered regions, just after evolutionary information. Furthermore, even though our approach treats each residue independently, our results are very competitive in terms of accuracy with respect to the state-of-the-art. A web-application is available at http://m24.giga.ulg.ac.be:81/x3Disorder. [less ▲]

Detailed reference viewed: 13 (4 ULg)
See detailOn the estimation of estuarine contaminant fluxes
Regnier, P.; Mouchet, Anne ULg; Ronday, François ULg et al

in ICES proceedings of the Scientific Symposium on the 1993 North Sea Quality Status Report (1996)

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailOn the evaluation of the through thickness residual stresses distribution of cold formed profiles
Rossi, Barbara ULg; Habraken, Anne ULg; Pascon, Frédéric ULg

in 10th International ESAFORM Conference on Material Forming : ESAFORM, Zaragoza, 18-20 April 2007 (2007)

The aim of this research is to evaluate the through thickness residual stresses distribution in the walls and in the corners of a cold-formed open section made of a material presenting a non linear ... [more ▼]

The aim of this research is to evaluate the through thickness residual stresses distribution in the walls and in the corners of a cold-formed open section made of a material presenting a non linear hardening behaviour. To get results as close as possible to the reality, the complete process is modeled, including coiling and uncoiling of the sheet before the cold bending of the corner itself. The elastic springback after flattening as well as after final shaping are also taken into account. In order to validate the model in predicting the residual stresses distribution, the presented results are confronted to experimental measurements and FE results collected from the literature. [less ▲]

Detailed reference viewed: 86 (30 ULg)
Full Text
Peer Reviewed
See detailOn the evolution and expression of Chlamydomonas reinhardtii nucleus-encoded transfer RNA genes
Cognat, Valerie; Deragon, Jean*-Marc; Vinogradova, Elizaveta et al

in Genetics (2008), 179(1), 113-123

In Chlamydomonas reinhardtii, 259 tRNA genes were identified and classified into 49 tRNA isoaccepting families. By constructing phylogenetic trees, we determined the evolutionary history for each tRNA ... [more ▼]

In Chlamydomonas reinhardtii, 259 tRNA genes were identified and classified into 49 tRNA isoaccepting families. By constructing phylogenetic trees, we determined the evolutionary history for each tRNA gene family. The majority of the IRNA sequences are more closely related to their plant counterparts than to animals ones. Northern experiments also permitted LIS to show that at least one member of each IRNA isoacceptor family is transcribed and correctly processed in vivo. A short stretch of T residues known to be a signal for termination of polymerase III transcription was found downstream of most IRNA genes. It allowed us to propose that the vast majority of the IRNA genes are expressed and to confirm that numerous IRNA genes separated by short spacers are indeed cotranscribed. Interestingly, in silico analyses and hybridization experiments show that the cellular IRNA abundance is correlated with the number of tRTNA genes and is adjusted to the codon usage to optimize translation efficiency. Finally, we studied the origin of SINEs, short interspersed elements related to tRNAs, whose presence in Chlamydomonas is exceptional. Phylogenetic analysis strongly suggests that tRNA(Asp)-related SINEs originate front a prokaryotic-type IRNA either horizontally transferred from a bacterium or originally present in mitochondria or chloroplasts. [less ▲]

Detailed reference viewed: 12 (1 ULg)