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See detailExperimental Validation Of The Constant Level Method For Identification Of Non-Linear Multi-Degree-Of-Freedom Systems
Dimitriadis, Grigorios ULg

in Journal of Sound & Vibration (2002), 258(5), 829-845

System identification for non-linear dynamical systems could find use in many applications such as condition monitoring, finite element model validation and determination of stability. The effectiveness ... [more ▼]

System identification for non-linear dynamical systems could find use in many applications such as condition monitoring, finite element model validation and determination of stability. The effectiveness of existing non-linear system identification techniques is limited by various factors such as the complexity of the system under investigation and the type of non-linearities present. In this work, the constant level identification approach, which can identify multi-degree-of-freedom systems featuring any type of non-linear function, including discontinuous functions, is validated experimentally. The method is shown to identify accurately an experimental dynamical system featuring two types of stiffness non-linearity. The full equations of motion are also extracted accurately, even in the presence of a discontinuous non-linearity. [less ▲]

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See detailUse of very high resolution (VHR) imagery for control and updating of legal land occupation maps in urban areas.
Binard, Marc ULg

in Final report summaries: Earth Observation by Satellite TELSAT4 (2002)

The ageing of the regional sector pla ns as also the recent changes in map content as defined by the new Walloon code on land planning of 27 November 1997 justify the analysis of new updating ... [more ▼]

The ageing of the regional sector pla ns as also the recent changes in map content as defined by the new Walloon code on land planning of 27 November 1997 justify the analysis of new updating methodologies. Most important in regard to the updating strategy to be adopted is the question of the availability of land for additional housing developments. This study therefore focuses on the assessment of available construction sites and some of their characteristics. The study area coves map sheet 50/6 of the Malmedy-Saint-Vith sector. The original method proposed in this case study is based on computer assisted photo interpretation of digital ortho-photomaps, combined with some sector map information. The method is user-friendly and leads immediately to quantitative assessments, also facilities of conceiving and editing of thematic maps. Further useful information is obtained by combining the map information with a digital terrain model of the area. Research, on the one hand, confirms the availability of land for additional housing developments, and on the other reveals the consequences of bad urbanisation policies (promotion and development of linear housing developments, insufficient control over quarrying activities, etc.) the "new code" introduces new town planning requirements (more detailed zoning analysis taking into account the environmental aspects, creation of protected areas, impact surveys, ground occupancy estimation) and strengthens the prospect of using this methodology further on. [less ▲]

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See detailGenetic variation and evolution in the genus Apodemus (Muridae : Rodentia)
Filippucci, M. G.; Macholan, M.; Michaux, Johan ULg

in Biological Journal of the Linnean Society (2002), 75(3), 395-419

Genetic variation was studied using protein electrophoresis of 28-38 gene loci in 1347 specimens of Apodemus agrarius, A. peninsulac, A. flavicollis, A. sylvaticus, A. alpicola, A. uralensis, A. cf ... [more ▼]

Genetic variation was studied using protein electrophoresis of 28-38 gene loci in 1347 specimens of Apodemus agrarius, A. peninsulac, A. flavicollis, A. sylvaticus, A. alpicola, A. uralensis, A. cf. hyrcanicus, A. hermonensis, A. m. mystacinus and A. in. epimelas, representing 121 populations from Europe, the Middle East, and North Africa. Mean values of heterozygosity per locus for each species ranged from 0.02 to 0.04. Mean values of Nei's genetic distance (D) between the taxa ranged from 0.06 (between A. flavicollis and A. alpicola) to 1.34 (between A. uralensis and A. agrarius). The highest values of D were found between A. agrarius and other Apodemus species (0.62-1.34). These values correspond to those generally observed between genera in small mammals. Our data show that A. agrarius and A. peninsulae are sister species, well-differentiated from other taxa. High genetic distance between A. m. mystacinus and A. m. epimelas leads us to consider them distinct species and sister taxa to other Western Palaearctic species of the subgenus Sylvaemus. The data also suggest a recent separation of members of the latter group from a common ancestor, and subsequent rapid radiation, making it difficult to infer phylogenetic relationships. Some taxonomic implications of the results are discussed further. (C) 2002 The Linnean Society of London. [less ▲]

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See detailAdvantages and drawbacks of nanospray for studying noncovalent protein-DNA complexes by mass spectrometry
Gabelica, Valérie ULg; Vreuls, Christelle ULg; Filée, Patrice ULg et al

in Rapid Communications in Mass Spectrometry : RCM (2002), 16(18), 1723-1728

The noncovalent complexes between the BlaI protein dimer (wild-type and GM2 mutant) and its double-stranded DNA operator were studied by nanospray mass spectrometry and tandem mass spectrometry (MS/MS ... [more ▼]

The noncovalent complexes between the BlaI protein dimer (wild-type and GM2 mutant) and its double-stranded DNA operator were studied by nanospray mass spectrometry and tandem mass spectrometry (MS/MS). Reproducibility problems in the nanospray single-stage mass spectra are emphasized. The relative intensities depend greatly on the shape of the capillary tip and on the capillary-cone distance. This results in difficulties in assessing the relative stabilities of the complexes simply from MS' spectra of protein-DNA mixtures. Competition experiments using MS/MS are a better approach to determine relative binding affinities. A competition between histidine-tagged BlaIWT (BlaIWTHis) and the GM2 mutant revealed that the two proteins have similar affinities for the DNA operator, and that they co-dimerize to form heterocomplexes. The low sample consumption of nanospray allows MS/MS spectra to be recorded at different collision energies for different charge states with 1 muL of sample. The MS/MS experiments on the dimers reveal that the GM2 dimer is more kinetically stable in the gas phase than the wild-type dimer. The MS/MS experiments on the complexes shows that the two proteins require the same collision energy to dissociate from the complex. This indicates that the rate-limiting step in the monomer loss from the protein-DNA complex arises from the breaking of the protein-DNA interface rather than the protein-protein interface. The dissociation of the protein-DNA complex proceeds by the loss of a highly charged monomer (carrying about two-thirds of the total charge and one-third of the total mass). MS/MS experiments on a heterocomplex also show that the two proteins BlaIWTHis and BlaIGM2 have slightly different charge distributions in the fragments. This emphasizes the need for better understanding the dissociation mechanisms of biomolecular complexes. [less ▲]

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See detailComment l'école peut-elle être plus juste et plus efficace ?
Crahay, Marcel ULg

in Grootaers, D. (Ed.) La pédagogie émancipatrice : l'utopie mise à l'épreuve (2002)

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See detailLa certification des modes de production de la viande sous label
De Longueville, Bertrand; Peeters, Alain; Stassart, Pierre M ULg

in Wallonie : Revue du Conseil Economique et Social de la Région Wallonne (2002)

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See detailRisk management in agricultural water use
Tychon, Bernard ULg; Balaghi, Riad; Jlibene, Mohammed

E-print/Working paper (2002)

Water availability for agricultural activities will decrease in the twenty-first century. As a consequence, agricultural water management will have to improve in order to meet two challenges: satisfy the ... [more ▼]

Water availability for agricultural activities will decrease in the twenty-first century. As a consequence, agricultural water management will have to improve in order to meet two challenges: satisfy the needs of an increasing world population; and alleviate the climate change impacts. One way to improve agricultural water management consists of including the ‘risk’ notion as much as possible at the different decision levels of: farmers, farmer corporations and states or associations of states. These three decision levels will be analysed both for rainfed and irrigated agriculture. The poorest countries are those most subject to climate risks, the main risks in developing countries, because they too rarely possess the means to combat excesses or shortages of water during the plant growing period (irrigation schemes) and they cannot rely on crop insurance or other kinds of support to maintain their income in bad years. Consequently, in order to ensure a minimum level of income, farmers will prefer low input practices that provide a low but stable production without involving too much investment or cash. Where possible they will diversify their production. This paper first defines hazard, vulnerability and risk in the particular context of drought assessment and prediction. It then presents some strategies to reduce water risk in three major categories: (1) more irrigated agricultural land in an efficient manner; (2) increased and better managed pasture and forest areas to benefit from otherwise lost water by evaporation process, increasing animal productivity; (3) well water managed dryland agriculture. In dryland agriculture, some additional public measures are necessary, mainly drought risk insurance and early warning systems, in order to promote investment in drought-prone environments and to provide tools for decision-making. The adoption of an efficient water use management of rainfall and irrigation will ensure food security, contribute to poverty alleviation, and free water for non-agricultural uses. The paper presents some new promising techniques and approaches. Finally, it discusses the sharing of risk between the different decision levels and launches some ideas to serve as discussion points in the electronic conference. [less ▲]

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See detailLe droit des régimes matrimoniaux en pratique
Leleu, Yves-Henri ULg; Casman, Hélène; Verbeke, Alain

Book published by Kluwer (2002)

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See detailEvaluation de la composition de la carcasse et de la qualité de la viande par ultrasonographie chez le porc
Youssao, A. K. L.; Verleyen, Vincent ULg; Leroy, Pascal ULg

in Annales de Médecine Vétérinaire (2002), 146(1), 19-29

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See detailComment je traite ... une polyarthrite rhumatoïde. L'avènement d'une nouvelle ère thérapeutique: les anticorps anti-TNF-alpha
Kaiser, Marie-Joëlle ULg; Malaise, Michel ULg

in Revue Médicale de Liège (2002), 57(8), 486-492

Rheumatoid arthritis (RA) is the most frequent autoimmune inflammatory arthropathy. Chronic synovial inflammation usually results in cartilage destruction, bone erosion and subsequent joint deformities ... [more ▼]

Rheumatoid arthritis (RA) is the most frequent autoimmune inflammatory arthropathy. Chronic synovial inflammation usually results in cartilage destruction, bone erosion and subsequent joint deformities with impaired physical function. These consequences are more or less delayed by standard disease-modifying antirheumatic drugs (DMARDs). A better knowledge of the basic mechanisms of the disease and new biomolecular tools led to the development of novel biological agents including TNF alpha blockers. TNF alpha is a key inflammatory cytokine that plays a critically important role in the pathogenesis of RA. TNF alpha blockers brought dramatic improvements in efficacy of RA treatment. Here we will review the pathophysiological elements of RA wich explain the therapeutic efficacy of these TNF alpha blockers and we will describe in details the molecules, Remicade (Infliximab) and Enbrel (Etanercept), wich will be very soon used in daily practice in Belgium. [less ▲]

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See detailInteraction of odorous lactones with phospholipids: Implications in toxicity towards producing yeast cells
Aguedo, Mario ULg; Beney, L.; Waché, Y. et al

in Biotechnology Letters (2002), 24(23), 1975-1979

Some lactonic aroma compounds, that can be produced industrially by microorganisms, become toxic towards the producing cells as these compounds reach high concentrations in the culture medium. To ... [more ▼]

Some lactonic aroma compounds, that can be produced industrially by microorganisms, become toxic towards the producing cells as these compounds reach high concentrations in the culture medium. To determine the manner by which these metabolites may influence yeast physiology, the effects of four lactones (concentration range of 100 to 300 mg l-1) on the growth of Yarrowia lipolytica and on the phase behaviour of deuterated dimyristoylphos-phatidylcholine (DMPC-d27) were studied. The results showed that the hydrophobic lactones decrease the phase transition temperature (Tm) of DMPC-d27 bilayers and that Tm decrease (ΔTm) was related to the inhibitory action of the lactones on yeast growth (evaluated by the lag time). These results suggest that whatever the lactone, a ΔTm of at least 2.5°C resulted in a total growth inhibition: this implicates the lactone-phospholipids interaction in the mechanism of yeast growth inhibition. The test used in the present study may be a predicting method to assess the in vivo action of potential membrane active compounds. [less ▲]

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See detailAu-delà des performances des jeunes de 15 ans, un système éducatif se profile... : premiers résultats de PISA 2000
Lafontaine, Dominique ULg

Report (2002)

Le Programme International de l'OCDE pour le Suivi des Acquis des élèves de 15 ans (PISA 2000) a évalué les élèves dans 3 domaines, la lecture/écriture ('littératie'), la culture mathématique et la ... [more ▼]

Le Programme International de l'OCDE pour le Suivi des Acquis des élèves de 15 ans (PISA 2000) a évalué les élèves dans 3 domaines, la lecture/écriture ('littératie'), la culture mathématique et la culture scientifique, en axant cette évaluation sur leur capacité de résolution de problèmes dans des contextes proches de la vie quotidienne. [less ▲]

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See detailTechniques de culture de cellules et de tissus
De Pauw-Gillet, Marie-Claire ULg

Learning material (2002)

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See detailActive insulation in dwellings
Embrechts, Jean-Jacques ULg; Caule, Patrice; Tamaz, Patrick et al

in NAG journaal (2002), 162

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