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See detailLes chemins actuels de la vulgarisation scientifique
Vanesse, Marc ULg

Conference (2009, March 24)

Colloque présentant différentes manières de vulgariser la science : presse scientifique, théâtre scientifique, exposition, musée, danse, documentaire scientifique, café scientifique...

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See detailLes Chemins Agricoles et l'Environnement : Stabilisation, Empierrement, Plantation linéaire.
Leclercq, J.; Marcoen, Jean Marie ULg; Sion, J. P. et al

Book published by Groupe d'étude Stabilisation, FSAGX, Région Wallonne - Fiches techniques (1990)

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See detailLes chemins d'exploitation, ces méconnus
Vanbrabant, Bernard ULg

in Actualités du Droit (1999)

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See detailLes chemins de fer belgo-allemands et le camp d’Elsenborn (1887-1894). Prémisses de la traversée du territoire belge ?
Bechet, Christophe ULg

in Guerres Mondiales et Conflits Contemporains (2011), 241(1), 13-31

L’extension du réseau ferroviaire allemand dans l’Eifel au cours des années 1880-1890 a suscité très tôt les craintes des diplomates et des agents de renseignement français. Cette extension en soi ... [more ▼]

L’extension du réseau ferroviaire allemand dans l’Eifel au cours des années 1880-1890 a suscité très tôt les craintes des diplomates et des agents de renseignement français. Cette extension en soi, d’abord motivée par des intérêts économiques, n’aurait suscité aucun commentaire si elle n’avait été accompagnée de l’extension du réseau ferroviaire belge dans le Luxembourg. Ce développement des infrastructures ferroviaires s’inscrivait qui plus est dans un contexte explosif de tension entre la France et l’Allemagne : bellicisme du général Boulanger et incident Schnaebelé de 1887. De son côté, la Belgique ne contribuait pas peu à alimenter ces bruits de guerre puisque les Chambres belges votaient la même année les crédits nécessaires pour fortifier la ligne de la Meuse en vue d’en interdire l’usage à un quelconque belligérant. Certes, cette crise s’apaise rapidement sur le plan de la diplomatie officielle mais un climat de méfiance subsiste, qui transparaît à travers les articles de journaux ou les rapports secrets des attachés militaires. Dans ce contexte, le réseau ferroviaire belgo-allemand est sous étroite surveillance française. En 1893, la création du camp militaire d’Elsenborn à la lisière de la Belgique vient confirmer les appréhensions de ceux qui crient depuis plusieurs années à la violation prochaine de la neutralité belge par l’Allemagne. Selon l’historiographie française de l’entre-deux-guerres, Elsenborn aurait été constitué dans un seul et unique but : prendre la place forte de Liège par surprise pour se jeter ensuite sur la France. Ce fait semble confirmer par l’adoption future du plan Schlieffen. Mais n’est-ce pas là faire preuve d’un dangereux anachronisme ? Les documents récents ont en effet révélé qu’aucun changement stratégique majeur ne s’était opéré dans le plan allemand à cette époque. Cependant, un doute subsiste. Comment ne pas y voir au moins un début d’intérêt pour le territoire belge ? A la lumière des nouvelles infrastructures apparues à la frontière belgo-allemande, le passage par la Belgique devenait « techniquement » réalisable. C’est cet intérêt renouvelé pour le territoire belge dans les milieux diplomatiques et militaires que nous étudierons dans cet article…à la veille des grands changements stratégiques du début du XXe siècle. [less ▲]

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See detailLes chemins de l’… sont pavés de bonnes intentions
Choffray, Jean-Marie ULg

E-print/Working paper (2012)

C’est un fait connu : « Les Liégeois ont été plus que tous les ans domptés. Néanmoins, ils ont toujours relevé leurs crestes » Citation de Michel de L’Hospital, 1558, gravée au fronton du bâtiment de la ... [more ▼]

C’est un fait connu : « Les Liégeois ont été plus que tous les ans domptés. Néanmoins, ils ont toujours relevé leurs crestes » Citation de Michel de L’Hospital, 1558, gravée au fronton du bâtiment de la Cité Administrative de Liège. [less ▲]

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See detailLes chemins de la compréhension : brochure d'accompagnement au film éponyme de Terwagne et Widart
Terwagne, Serge; Widart, Nicole; Lafontaine, Dominique ULg

Report (1996)

Detailed reference viewed: 28 (1 ULg)
See detailLes chemins de la migration en Belgique et au Québec XVIIè-XXè siècles
Pasleau, Suzanne ULg

Book published by Editions Academia-Erasme (1995)

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See detailLes chemins de la violence chez la personne adulte – approche de la violence conjugale
Garcet, Serge ULg

Conference given outside the academic context (2012)

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See detailLes chemins vicinaux : une mise au point?
Lecocq, Pascale ULg

in Lecocq, Pascale; Lewalle, Paul (Eds.) Contraintes, atteinte et limite à la propriété (2005)

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See detailThe Chemistry in HCCI Combustion and the Use of Reduced Kinetic Mechanisms for Controlling Strategies
Machrafi, Hatim ULg

in Lackner, M.; Winter, F.; Agarwal, A. K. (Eds.) Handbook of Combustion (2010)

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See detailChemistry of silica at different concentrations of non-ionic surfactant solutions: Effect of pH of the synthesis gel on the preparation of mesoporous silicas
Léonard, Alexandre ULg; Blin, J. L.; Jacobs, P. A. et al

in Microporous and Mesoporous Materials (2003), 63(1-3), 59-73

Ordered and disordered mesoporous silicas have been synthesized through an assembly of non-ionic decaoxyethylene cetyl ether [C 16(EO) 10] and a tetramethoxysilane silica source by variation of the pH ... [more ▼]

Ordered and disordered mesoporous silicas have been synthesized through an assembly of non-ionic decaoxyethylene cetyl ether [C 16(EO) 10] and a tetramethoxysilane silica source by variation of the pH value of the synthesis gel. The structure, texture and morphology of the mesoporous silicas, synthesized with concentrated and diluted surfactant solutions, have been discussed from the perspective of silica's chemistry upon a variation of pH values of the synthesis gel (micellar solution). With concentrated surfactant solutions (50 wt%), disordered compounds are obtained in a range of pH from 2.0 to 7.0 (micellar solution). As the pH increases, however, the pore size distributions (PSD) become broader and bimodality appears due to the micelle-templated silica (MTS) mesopores and openings arising from silica dissolution-reprecipitation processes. Also, the MTS pores expand due to a change in conformation of the surfactant hydrophilic head upon pH increase. On the other hand, diluted surfactant solutions (10 wt%) lead to ordered materials in a pH range from 2.0 to 7.0 (synthesis gel). The PSD remain very narrow but interparticular porosity appears and the morphologies undergo deep changes from toroids, gyroids and ropes to aggregates of very small particles with increasing pH. © 2003 Elsevier Inc. All rights reserved. [less ▲]

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See detailChemo- and enantio-selective method for the analysis of amino acids by capillary electrophoresis with in-capillary derivatization.
Fradi, Ines ULg; Servais, Anne-Catherine ULg; Lamalle, Caroline ULg et al

in Journal of Chromatography. A (2012), 1267

A novel dual chiral CE method was developed for the separation of l- and d-amino acids (AAs), using in-capillary derivatization with 9-fluoroenylmethyl chloroformate (FMOC). Firstly, using pre-column ... [more ▼]

A novel dual chiral CE method was developed for the separation of l- and d-amino acids (AAs), using in-capillary derivatization with 9-fluoroenylmethyl chloroformate (FMOC). Firstly, using pre-column derivatization, the enantioseparation of FMOC-AAs was optimized according to the nature of cyclodextrins (CD). A background electrolyte (BGE) composed of 30mM beta-CD, 30mM octakis(2,3-dihydroxy-6-O-sulfo)-gamma-CD (OS-gamma-CD), 40mM tetraborate and 15% isopropanol (IPA) was selected and led to 17 baseline resolved pairs (R(s)=1.7-5.8) and two partially resolved pairs (Lys, R(s)=0.5 and Arg, R(s)=1.2). Experimental conditions for in-capillary derivatization were then optimized. Several parameters, such as mixing voltage and time, concentration of labeling solution and the length of the spacer plug were studied. The optimal conditions for in-capillary derivatization procedure were obtained using successive hydrodynamic injections (30mbar) of AAs for 2s, borate buffer for 4s and 10mM FMOC solution for 6s, followed by a mixing at 3kV for 72s and wait time of 1min. Moreover, a particular attention was paid to improve separation chemoselectivity. The effect on stereoselectivity and chemoselectivity of different factors, such as decrease of pH and tetraborate concentration and the addition of sodium dodecyl sulfate (SDS), was investigated using the in-capillary derivatization procedure. The best separation of a standard mixture of ten AA racemates was observed using a BGE containing 30mM beta-CD, 30mM OS-gamma-CD, 25mM SDS, 40mM sodium tetraborate and 17% IPA. [less ▲]

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See detailChemo-mechanical interactions in clay: a correlation between clay mineralogy and Atterberg limits
Schmitz, R. M.; Schroeder, Christian ULg; Charlier, Robert ULg

in Applied Clay Science (2004), 26(1-4), 351-358

Among some few others tests, the evaluation of the Atterberg limits is a very basic soil mechanical test allowing a first insight into the chemical reactivity of clays. Basically, the liquid limit and the ... [more ▼]

Among some few others tests, the evaluation of the Atterberg limits is a very basic soil mechanical test allowing a first insight into the chemical reactivity of clays. Basically, the liquid limit and the plasticity index are highly and mainly influenced by the ability of clay minerals to interact with liquids. In this contribution, a correlation between the Atterberg limits and clay mineralogy is proposed. This correlation increases the understanding between clay mineralogists and engineers in soil mechanics; additionally a wealth of information in clay mineralogy literature is now available to predict the mechanical behaviour of clays via index tests. (C) 2003 Elsevier B.V. All rights reserved. [less ▲]

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See detailChemo-Mechanical Modelling of Soil or Rock Degradation
Charlier, Robert ULg; Boukpeti, N.

in 2nd Int. Symposium on Continuous and Discontinuous Modelling of Cohesive Frictional Materials. (2004, September)

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See detailLes chémokines et leurs récepteurs : rôle dans les infections virales et dans les pathologies cancéreuses
Burteau, C.; Willems, Luc ULg; Kettmann, Richard ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2007)

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See detailChemometric tools for NIRS and NIR hyperspectral imaging
Dale, Laura ULg; Thewis, André ULg; Rotar, Ioan et al

in Bulletin of USAVM Cluj Napoca, Agriculture (2012, September 27), 69(1), 70-76

Nowadays in agriculture, new analytical tools based on spectroscopic technologies are developed. Near Infrared Spectroscopy (NIRS) is a well known technology in the agricultural sector allowing the ... [more ▼]

Nowadays in agriculture, new analytical tools based on spectroscopic technologies are developed. Near Infrared Spectroscopy (NIRS) is a well known technology in the agricultural sector allowing the acquisition of chemical information from the samples with a large number of advantages, such as: easy to use tool, fast and simultaneous analysis of several components, non-polluting, non-invasive and non destructive technology, and possibility of online or field implementation. Recently, NIRS system was combined with imaging technologies creating the Near Infrared Hyperspectral Imaging system (NIR-HSI). This technology provides simultaneously spectral and spatial information from an object. The main differences between NIR-HSI and NIRS is that many spectra can be recorded simultaneously from a large area of an object with the former while with NIRS only one spectrum was recorded for analysis on a small area. In this work, both technologies are presented with special focus on the main spectrum and images analysis methods. Several qualitative and quantitative applications of NIRS and NIR-HSI in agricultural products are listed. Developments of NIRS and NIR-HSI will enhance progress in the field of agriculture by providing high quality and safe agricultural products, better plant and grain selection techniques or compound feed industry’s productivity among others. [less ▲]

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See detailChemometrics and chromatographic fingerprints to discriminate and classify counterfeit medicines containing PDE-5 inhibitors.
Deconinck, Eric; Sacre, Pierre-Yves ULg; Courselle, Patricia et al

in Talanta (2012), 100

Chromatographic fingerprints recorded for a set of genuine and counterfeit samples of Viagra® and Cialis® were evaluated for their use in the detection and classification of counterfeit samples of these ... [more ▼]

Chromatographic fingerprints recorded for a set of genuine and counterfeit samples of Viagra® and Cialis® were evaluated for their use in the detection and classification of counterfeit samples of these groups of medicines. Therefore several exploratory chemometric techniques were applied to reveal structures in the data sets as well as differences among the samples. The focus was on the differentiation between genuine and counterfeit samples and on the differences between the samples of the different classes of counterfeits as defined by the Dutch National Institute for Public Health and the Environment (RIVM). In a second part the revealed differences between the samples were modelled to obtain a predictive model for both the differentiation between genuine and counterfeit samples as well as the classification of the counterfeit samples. The exploratory analysis clearly revealed differences in the data for the genuine and the counterfeit samples and with projection pursuit and hierarchical clustering differences among the different groups of counterfeits could be revealed, especially for the Viagra® data set. For both data sets predictive models were obtained with 100% correct classification rates for the differentiation between genuine and counterfeit medicines and high correct classification rates for the classification in the different classes of counterfeit medicines. For both data sets the best performing models were obtained with Least Square-Support Vector Machines (LS-SVM) and Soft Independent Modelling by Class Analogy (SIMCA). [less ▲]

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See detailChemometrics methods for the identification and the monitoring of an odour in the environement with an electronic nose
Nicolas, Jacques ULg; Romain, Anne-Claude ULg; Maternova, J.

in Ramirez-Silva, Maria Theresa (Ed.) Sensors and chemometrics (2001)

The purpose of the paper is to briefly review some researches regarding the adaptation of the electronic nose principle to recognise some malodour sources in the environment, if possible directly in the ... [more ▼]

The purpose of the paper is to briefly review some researches regarding the adaptation of the electronic nose principle to recognise some malodour sources in the environment, if possible directly in the field, and to monitor the odour intensity continuously. Research aims at improving the portability and the user-friendliness of the instrument, together with testing what kind of signal may be used to monitor the odour. A laboratory-made electronic nose, constituted of an array of tin-oxide sensors, is used in different configurations. The ambient air is either sampled around environmental sources (landfill, urban waste composting facilities, …), or directly transferred into the sensor chamber in the field. Two main options are considered : firstly, identifying the source of odour in the background and among interfering odours and, secondly, when the malodour is recognised, trying to monitor it continuously in order, for example, to assess the nuisance or to control an odour abatement system. Chemometrics methods are generally used for both purposes. They provide quick answers and allow to evaluate the relationships between variables and between observations at a glance. They are applied on the sensor signals, eventually preprocessed by a suitable algorithm. Non-supervised analyses, such as Principal Component Analysis (PCA), provide basically a performance evaluation of the system during the development phase. On the contrary, supervised analyses, such as Discriminant Analysis (DA), or some Neural Networks algorithms are quite appropriate to make a reliable recognition in real time, when the system is developed. To predict the odour intensity, different techniques are tested : either using only one of the sensor elements, or applying different chemometrics techniques, such as Multilinear Regression (MLR) on the original measured sensor signals, Principal Component Regression (PCR), or Partial Least Squares regression (PLS). The latter seems to be the most adapted model for the intensity prediction. [less ▲]

Detailed reference viewed: 75 (32 ULg)