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See detailFire resistance of simple frames according to eurocode 3
Franssen, Jean-Marc ULg; schröder, L.; Dotreppe, Jean-Claude ULg

in Batista, C.; de M Batista, Eduardo; Pfeil, Michèle S. (Eds.) Proc. 5th Int. Colloquium on Structural Stability (1996)

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See detailFire resistance of timbers from tropical countries and comparison of experimental charring rates with various models
Njankouo, Jacques Michel; Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg

in Construction & Building Materials (2005), 19(5), 376-386

Tropical hardwood species are more and more used in the field of construction due to the particular qualities they can offer. Presently it is no longer possible to envisage the development of construction ... [more ▼]

Tropical hardwood species are more and more used in the field of construction due to the particular qualities they can offer. Presently it is no longer possible to envisage the development of construction materials and products without taking into consideration the problem of their fire behaviour, and more particularly of their fire resistance. In the case of timber elements, this characteristic is mainly influenced by the charring rate of the external layers of the element. On the other hand this parameter is influenced by the density of the material. Limited information is available on the charring rate of tropical hardwood species. Therefore experimental investigations have been conducted at the University of Liege to study this characteristic. Seven tropical and three timber species from temperate countries have been examined. Two types of test have been used, one on small specimens, the other on a construction element made of one single material. In the first type, 20 specimens have been manufactured by gluing several laminates together. The specimens were instrumented with four thermocouples inserted at various depths in four different laminates. In the second type, a non-loaded wall made of 12 glued-laminated spruce beam profiles was instrumented with thermocouples embedded at different depths in the panel for the evaluation of the charring rate. Experimental charring rates have been compared with the results derived from Eurocode EC5-1.2 recommendation [ENV 1995-1-2. Eurocode 5: Design of timber structures - Part 1-2: General rules - Structural fire design. European prestandard; 1994], Australian standard AS 1720.4 relation [AS 1720.4. Timber structures Part 4: fire resistance of structural timber members. North Sydney, Australia: Standards Australia; 1990] and White's model [Charring rates of different wood species. PhD dissertation. Madison University of Wisconsin, Madison, WI, 1988; White RH, Erik V, Nordheim EV. Charring rate of wood for ASTM El 19 exposure. Fire Technol 1992-28(1)]. This comparison shows that the results obtained from these three models are not entirely satisfactory for tropical hardwood species. Therefore a new model has been proposed. (C) 2004 Elsevier Ltd. All rights reserved. [less ▲]

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See detailFire resistance of unrestrained welded steel beams submitted to lateral-torsional buckling
Vila Real, P. M. M.; Lopes, N.; Simoes da Silva, L. et al

in Hoffmeister, B.; Hechler, O. (Eds.) Proceedings of the 4th European Conference on Steel and Composite Structures (EUROSTEEL 2005) (2005)

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See detailFire safety engineering analysis of a super market structure composed of cambered cellular beams
Franssen, Jean-Marc ULg; Majkut, S.; Cajot, L.-G. et al

in Hoffmeister, B.; Hechler, O. (Eds.) Proceedings of the 4th European Conference on Steel and Composite Structures (EUROSTEEL 2005) (2005)

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See detailFire salamander (Salamandra salamandra) in Larzac plateau: low occurrence, pond-breeding and cohabitation of larvae with paedomorphic palmate newts (Lissotriton helveticus)
Denoël, Mathieu ULg; Winandy, Laurane ULg

in Acta herpetologica (2014), 9(1), 43-49

Alternative reproductive strategies are widespread in caudate amphibians. Among them, fire salamanders (Salamandra salamandra) usually rely on streams to give birth to aquatic larvae but also use ponds ... [more ▼]

Alternative reproductive strategies are widespread in caudate amphibians. Among them, fire salamanders (Salamandra salamandra) usually rely on streams to give birth to aquatic larvae but also use ponds, whereas palmate newt larvae (Lissotriton helveticus) typically metamorphose into terrestrial juveniles, but can also reproduce in retaining their gills, a process known as paedomorphosis. Here we report repeated observations of an unusual case of coexistence of these two alternative traits in the same pond (Larzac, France). The prevalence of fire salamanders in Southern Larzac was very low (pond occupancy: 0.36%). The observed abundance of fire salamander larvae and paedomorphic newts was also low in the studied pond. On one hand, the rarity of this coexistence pattern may suggest that habitat characteristics may not be optimal or that competition or predation processes might be operating. However, these hypotheses remain to be tested. On the other hand, as this is the only known case of breeding in Southern Larzac, it could be considered to be at a high risk of extirpation. [less ▲]

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See detailFire test on normal and high-strength reinforced concrete columns
Aldea, C. M.; Franssen, Jean-Marc ULg; Dotreppe, Jean-Claude ULg

in NIST Special Publication 919 (1997)

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See detailFire tests and calculation methods for circular concrete columns
Franssen, Jean-Marc ULg; Dotreppe, Jean-Claude ULg

in Fire Technology (2003), 39(1), 89-97

The introduction sets the scene of the present paper i.e. the extensive research works performed at the University of Liege in order to derive acceptable calculation methods for the re design of concrete ... [more ▼]

The introduction sets the scene of the present paper i.e. the extensive research works performed at the University of Liege in order to derive acceptable calculation methods for the re design of concrete columns. It is explained that all previous works have been based on square or rectangular cross sections, for which corner spalling was observed very often, whereas circular section are nowadays becoming more and more popular. In order to examine the influence of the circular shape on the behavior under re conditions, an experimental research study has been performed recently at the University of Liege. This paper describes the test procedure, the observations made, and the values obtained for the re resistance. Theoretical methods have been developed for a quick, safe, and efficient design of concrete columns under re conditions. These methods have been applied successfully to the recently tested circular columns. [less ▲]

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See detailFire tests made for the ATTEL RFCS research project
Franssen, Jean-Marc ULg; Dumont, Fabien ULg; Wellens, Eric ULg et al

Conference given outside the academic context (2011)

The ATTEL project (Performance-Based approaches for high strength tubular columns and connections during earthquake and fire loadings) aims at developing performance-based design approaches where the ... [more ▼]

The ATTEL project (Performance-Based approaches for high strength tubular columns and connections during earthquake and fire loadings) aims at developing performance-based design approaches where the capacity design of steel grades up to S690 and S700MC – widely used in seismic engineering to avoid brittle failure and ensure ductile behaviour – will be extended to high strength steel circular hollow section structures to prevent failure and collapse under both earthquake and fire loading. Within this research projects, fire resistance tests have been performed on 4 columns, 4 beam-to-column joints and 3 column bases. The main features and results of these tests are presented here. [less ▲]

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See detailFirm-Level Evidence on Innovation in Spain
Artige, Lionel ULg

Conference (2009, October 08)

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See detailFirst and second generations of COX-2 selective inhibitors
De leval, X.; Julémont, F.; Benoit, V. et al

in Mini Reviews in Medicinal Chemistry (2004), 4

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See detailFirst and second order convex approximation strategies in structural optimization
Fleury, Claude ULg

in Structural and Multidisciplinary Optimization (1989), 1(1), 3-10

In this paper, various methods based on convex approximation schemes are discussed, that have demonstrated strong potential for efficient solution of structural optimization problems. First, the convex ... [more ▼]

In this paper, various methods based on convex approximation schemes are discussed, that have demonstrated strong potential for efficient solution of structural optimization problems. First, the convex linearization method (CONLIN) is briefly described, as well as one of its recent generalizations, the method of moving asymptotes (MMA). Both CONLIN and MMA can be interpreted as first order convex approximation methods, that attempt to estimate the curvature of the problem functions on the basis of semi-empirical rules. Attention is next directed toward methods that use diagonal second derivatives in order to provide a sound basis for building up high quality explicit approximations of the behaviour constraints. In particular, it is shown how second order information can be effectively used without demanding a prohibitive computational cost. Various first and second order approaches are compared by applying them to simple problems that have a closed form solution. [less ▲]

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See detailFirst approach on the skull morphology of the black rat (Rattus rattus) from Terceira and São Miguel islands (Azores archipelago)
Ramalhinho, Maria da Graça; Mathias, Maria da Luz; Santos Reis, Margarita et al

in Vie et milieu (1996), 46(3-4), 245-251

The present paper deals with an analysis of metric (cranial measurements) and non metric (epigenetic cranial characters) variation in black rat populations from S. Miguel and Terceira islands compared to ... [more ▼]

The present paper deals with an analysis of metric (cranial measurements) and non metric (epigenetic cranial characters) variation in black rat populations from S. Miguel and Terceira islands compared to a continental sample. Assuming the Azorean rats originate from the European continent, we tested the similarity between the samples, considering only adult and subadult animals. Having verified that there was no sexual dimorphism in the characters studied, we computed discriminant functions and made a PCA with the most discriminant variables. The three samples are clearly separated by these functions, the Azorean rats showing a larger general skull size and differing between the two islands. The Mean Measure of Divergence (MMD), based on non metric cranial traits frequencies, was also used to express the interpopulational differences: the rats of Terceira differ significantly either from the continental ones or from those of S. Miguel. Finally, the possible origin of these differences is disussed. [less ▲]

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See detailA first approach to “Learning Dashboards” in formal learning contexts
Verpoorten, Dominique ULg; Westera, W; Specht, M

Conference (2011, September 20)

This position paper introduces to “learning dashboards”, flagged as a new breed of eLearning interfaces. Following an observation of 3 instances of these structures for regulative support, it suggests ... [more ▼]

This position paper introduces to “learning dashboards”, flagged as a new breed of eLearning interfaces. Following an observation of 3 instances of these structures for regulative support, it suggests possible effects on attention to the learning experience, reflective learning and sense of personalisation. The paper concludes with the identification of research challenges associated with the mirroring of tracked data, inherent to these displays. [less ▲]

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See detailFirst approaches for a combined use of microsatellites and pedigree data to estimate relationships.
Bömcke, Elisabeth ULg; Gengler, Nicolas ULg

in Book of Abstract of the 58th Annual Meeeting of the European Association for Animal Production (2007, August)

The main objective of conservation is the preservation of genetiv diversity. Among several tools recommended to measure genetic variability, relationships coefficients are often used. They can be ... [more ▼]

The main objective of conservation is the preservation of genetiv diversity. Among several tools recommended to measure genetic variability, relationships coefficients are often used. They can be estimated from pedigree but also from direct knowledge of hte genotype. The Skyros pony is an example of a small breed concerned by the management of genetic variability. However,the analysis of the pedigree showed its very poor quality. A part of the population was therefore genotyped for 16 microstellites and two estimators of relationships were tested: the Lynch & Ritland (L&R) (anly based on genotypes and described as having the best performances for all population comositionsof the mammal species) and a new estimator (developed for this study and combining pedigree and microsatellite information). In order to compare the results, a Principal Component Analysis (PCA) was performed. The new estimator explained a higher percentage of information within the 3 principal factors of the PCA (41.99%) than the L&R estimator (20.61%). The graphic PCA representation showed a better separation between the reference group and the rest of the populationin the case of the new estimator. The new estimator showed interesting preliminary results and results support interest in combining information in case of incomplete pedigrees and/or use of a limited number of markers. [less ▲]

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See detailA first approximation for quantization of singular spaces
Poncin, Norbert; Radoux, Fabian ULg; Wolak, Robert

in Journal of Geometry & Physics (2009), 59(4), 503-518

Many mathematical models of physical phenomena that have been proposed in recent years require more general spaces than manifolds. When taking into account the symmetry group of the model, we get a ... [more ▼]

Many mathematical models of physical phenomena that have been proposed in recent years require more general spaces than manifolds. When taking into account the symmetry group of the model, we get a reduced model on the (singular) orbit space of the symmetry group action. We investigate quantization of singular spaces obtained as leaf closure spaces of regular Riemannian foliations on compact manifolds. These contain the orbit spaces of compact group actions and orbifolds. Our method uses foliation theory as a desingularization technique for such singular spaces. A quantization procedure on the orbit space of the symmetry group–that commutes with reduction–can be obtained from constructions which combine different geometries associated with foliations and new techniques originated in Equivariant Quantization. The present paper contains the first of two steps needed to achieve these just detailed goals. [less ▲]

Detailed reference viewed: 33 (9 ULg)