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See detailQuantifications équivariantes
Radoux, Fabian ULg

Scientific conference (2012, March 15)

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See detailRation comparée conventionnelle - bio en élevage de bovin viande et lait
Beckers, Yves ULg

Conference given outside the academic context (2012)

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See detailSensitivity of the Oxygen Dynamics in the Black Sea North Western Shelf to physical and biogeochemical processes : 3D model approach
Capet, Arthur ULg; Beckers, Jean-Marie ULg; Grégoire, Marilaure ULg

Conference (2012, March 13)

The presentation evidences the role of benthic oxygen consumption in the seasonal hypoxia afecting the Norht western shelf of the Black Sea. Spatial variability of related processes is evidenced and ... [more ▼]

The presentation evidences the role of benthic oxygen consumption in the seasonal hypoxia afecting the Norht western shelf of the Black Sea. Spatial variability of related processes is evidenced and finally interanual variability of hypoxia severity is quantified and related to nitrogen riverine inputs. [less ▲]

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See detailMéthodologie de dimensionnement et de confection d’un Seepage Meter artisanal
NITCHEU Martial; MIDEKOR Akoly; Sauret, Elie ULg

Report (2012)

This document is a guideline for the design of seepage meter to direct flux measurements of water exchanged at the interface "groundwater - river". It describes the principles, limitations and advantages ... [more ▼]

This document is a guideline for the design of seepage meter to direct flux measurements of water exchanged at the interface "groundwater - river". It describes the principles, limitations and advantages of the use of seepage meters and provides technical details relevant to the design and manufacture a seepage meter based of the simplified model of Lee (1977). Direct measurements on the Kou River in Burkina Faso (West Africa) is proposed. [less ▲]

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See detailImpact of Protective Compounds on the Viability, Physiological State and Lipid Degradation of FreezeDried Pseudomonas Fluorescens BTP1 during Storage
Mputu Kanyinda, Jean-Noël ULg; Pierart, C.; Weekers, F. et al

in International Journal of Biotechnology and Biochemistry (2012), 8(4), 17-26

The drying of bacteria remains a major alternative in order to keep them long term. After centrifugation, the bacterial pellet of Pseudomonas fluorescensBTP1 was divided in two fractions one with ... [more ▼]

The drying of bacteria remains a major alternative in order to keep them long term. After centrifugation, the bacterial pellet of Pseudomonas fluorescensBTP1 was divided in two fractions one with protecting compounds (2% glycerol or 5% maltodextrine) and one without and freeze-dried. After freeze drying, powders were sealed in aluminium bag under vacuum and stored at 4 or 20°C. The parameters such as viability, the conductivity and the ratio of polyunsaturated fatty acids/saturated fatty acids were used to investigate the viability of freeze-dried powders during storage. For example cell concentration of powder with glycerol (PG) at CFU/g before storage is 4.109 and after 7 month 2.108 at 4°C and 3,5.107 at 20°C). The ratio of polyunsaturated fatty acids/saturated fatty acids decrease in function of time (e.g. at 4°C the ratios of C18:3 and C18:2 by C16:0 decreases respectively of 0,013 to 0,001 and 0,05 to 0,03 after 60 days of storage). In the present study, flow cytometric analysis was applied to evaluate the state in which the cells are at the end of storage time. We compared the survival results of bacteria obtained by plate count with the flow cytometric analysis results. [less ▲]

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See detailPhase retarders in liquid crystals polymers
Piron, Pierre ULg

Scientific conference (2012, March 12)

Liquid crystals polymers posses birefringent properties and they are locally orientable, they allow the realization of space variant optical retarders which creates non uniformly polarized beam. To ... [more ▼]

Liquid crystals polymers posses birefringent properties and they are locally orientable, they allow the realization of space variant optical retarders which creates non uniformly polarized beam. To realize a retarder, liquid crystals are exposed to a UV linearly polarized beam, the optical axis of the retarder will be parallel to the incident polarization. We shall present an innovative way to produce space-variant retarders without mechanical interaction polarization holography . Superposing several beams differently polarized, results in a non-uniformly polarized recording beam used to realize space variant retarders. We shall also present our research retarders for two applications based on this method polarization analysis and coronagraphy. [less ▲]

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See detailBudget : Après la rigueur douce, la concurrence dure?
Petit, Nicolas ULg

Article for general public (2012)

L’un des maux endémiques de l’économie belge tient aux pressions concurrentielles insuffisantes sur de nombreux marchés de produits. Faute d’un cadre de surveillance effectif, les prix des biens et ... [more ▼]

L’un des maux endémiques de l’économie belge tient aux pressions concurrentielles insuffisantes sur de nombreux marchés de produits. Faute d’un cadre de surveillance effectif, les prix des biens et services demeurent – comme le décrivent maintes études – plus élevés que dans d'autres États membres, et ce spécialement dans le secteur de la vente au détail et dans les industries de réseaux (énergie, télécommunications, transport ferroviaire, etc.). [less ▲]

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See detailOpinion publique et nucléaire : critique et dépassement
Mormont, Marc ULg

Conference (2012, March 10)

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See detailÉvolution des effectifs des populations d’éléphants d’Afrique soudanosahélienne :enjeux pour leur conservation
Bouché, Philippe ULg

Doctoral thesis (2012)

The first objective of this thesis was to analyze the evolution of Sudano-Sahelian African elephant populations in a context of environmental challenges and increasing human demography. The second ... [more ▼]

The first objective of this thesis was to analyze the evolution of Sudano-Sahelian African elephant populations in a context of environmental challenges and increasing human demography. The second objective was to propose solutions for elephant conservation in the Sudano-Sahelian context. To fulfill these objectives, aerial surveys have been carried out in every protected area harboring a known population of elephants. This work was first implemented at a local level on several study cases and finally at a global level. Results of aerial surveys estimate the current elephant number at minimum 7,745 elephants, about 2% of the African elephant total population. This confirmed that the elephant populations have been progressively fragmented and confined to few protected areas representing 5% of the Soudano-Sahelian strip. The long term (four decades) elephant population trends has been studied by comparing our results with the database of the study area. The half of the monitored population collapse during the last 40 years. The viability of small elephant population of 200 elephants and below is critical and several of them collapsed. Contrasted local situation have been observed : if a number depletion is often observed, in some protected areas elephant populations are stable or increasing. Although, trends of other large mammals’ population is not linked to that of the elephants. This result allow to conclude that the elephant is not a good indicator of the abundance of other large mammals’ population. Causes of elephant populations’ depletion are both due to climate change (global drought) and socio-economic (human demography and land use pressure) issues. An appropriate and permanent field management, a better valorisation of elephants and the creation of negotiated corridors with local people could garantee the future of Sudano-Sahelian African elephants. [less ▲]

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See detailAnalysis of virgin olive oil volative fraction from two distinct geographical areas of eastern Morocco
Tanouti, K.; Serghini Caid, H.; Abid, M. et al

Conference (2012, March 09)

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See detailProportion of extended-spectrum ß-lactamase-producing Enterobacteriaceae in community setting in Ngaoundere, Cameroon
LONCHEL, Carine Magoué; MEEX, Cécile ULg; Gangoué-Piéboji, Joseph et al

in BMC Infectious Diseases (2012), 12

BACKGROUND: There is no information regarding the resistance mechanisms of extended-spectrum ß-lactamase (ESBL)-producing Enterobacteriaceae in community setting in Cameroon. The current study aimed to ... [more ▼]

BACKGROUND: There is no information regarding the resistance mechanisms of extended-spectrum ß-lactamase (ESBL)-producing Enterobacteriaceae in community setting in Cameroon. The current study aimed to determine the proportion of ESBLs in Enterobacteriaceae isolated in the community and to analyse some risk factors associated with ESBL carriage. METHODS: Faecal samples were collected from 208 different outpatients and 150 healthy student volunteers between 3 January and 3 April 2009. Enterobacterial isolates resistant to third-generation cephalosporins were screened for ESBL production by the double-disk synergy test. Presumptive ESBL-producing isolates with positive synergy test were identified by Mass Spectrometry using the BioTyper MALDI-TOF. For such ESBL positive isolates, antibiotic susceptibility was determined by the Vitek 2 system. PCR and sequencing were performed for the detection of different types of ESBL genes in presumptive ESBL-producing isolates. Statistical methods were used for the univariate calculation of risk factors. RESULTS: During the study period, a total of 358 faecal samples were analysed; 58 of such samples (16%) showed an ESBL phenotype and were confirmed by PCR. The proportion of ESBL producers in faecal carriage was statistically different between outpatients and student volunteers (23.1% vs. 6.7%: p < 0.000). According to a univariate analysis, previous use of antibiotics (ciprofloxacin) appeared to be a risk factor for ESBL carriage (p < 0.05).Escherichia coli was the species most frequently isolated among the ESBL producers in outpatients (66.7%) and student volunteers (90%). Isolates showed additional resistance to gentamicin, ciprofloxacin and trimethoprim/sulfamethoxazole but none of them was resistant to temocillin, amikacin or meropenem. Most of the strains (97%) produced a CTX-M group 1 enzymes [CTX-M-15 (98%) or CTX-M-1 (2%)] and the remaining strains produced SHV-12 enzyme (3%). CONCLUSIONS: The use of drugs such as amoxicillin, ciprofloxacin and trimethoprim/sulfamethoxazole does not seem appropriate for empirical treatment because of emerging resistance. The implementation in Cameroon or in other African countries of methods of screening ESBL-producing organisms in routine laboratories is of great importance in order for us to offer patients appropriate treatment and for infection control efforts to succeed. [less ▲]

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See detailUne approche par compétences : Introduction, bénéfices et écueils – Illustrations par le cas de l’ULg -
Poumay, Marianne ULg

Conference (2012, March 08)

Dédiée à un public d'enseignants-chercheurs majoritairement français, cette conférence abordait l'intérêt du concept de compétence pour décrire des programmes dans l'enseignement supérieur, mais aussi ... [more ▼]

Dédiée à un public d'enseignants-chercheurs majoritairement français, cette conférence abordait l'intérêt du concept de compétence pour décrire des programmes dans l'enseignement supérieur, mais aussi pour les ré-organiser et pour y mettre en œuvre des méthodes innovantes et clairement centrées sur l'apprentissage des étudiants. La question de l'évaluation de ces compétences y a aussi été effleurée. [less ▲]

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See detailProcess for preparing electromagnetic interference shileding materials
Thomassin, Jean-Michel ULg; Jérôme, Christine ULg; Detrembleur, Christophe ULg et al

Patent (2012)

The present invention relates to a process for preparing an electromagnetic interference shielding material, or a precursor thereof, comprising a first polymer matrix and carbon conductive loads, said ... [more ▼]

The present invention relates to a process for preparing an electromagnetic interference shielding material, or a precursor thereof, comprising a first polymer matrix and carbon conductive loads, said process comprises the steps of: (a) Forming a reaction mixture comprising carbon conductive loads and a polymerizable medium said polymerizable medium comprising one or more monomers dissolved in a solvent, (b) Exposing the reaction mixture to polymerization conditions to polymerize said polymerizable medium and thus form a polymer, and (c) Forming a precipitate or an agglomerate of an electromagnetic interference shielding material made of less than 50 wt.% carbon conductive loads dispersed in the first polymer matrix formed in step (b), characterized in that, said polymer is insoluble in said solvent and in that a fraction of the polymer chains thus formed are grafted on part of the surface of the carbon conductive loads. [less ▲]

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See detailCaractérisation des espaces périurbains, morphologie actuelle et prospective
De Smet, Fabian ULg

Doctoral thesis (2012)

L’étalement urbain est un défi majeur pour nos territoires européens et plus spécifiquement belges. Il se concrétise par l’urbanisation massive de territoires périphériques de villes, appelés espaces ... [more ▼]

L’étalement urbain est un défi majeur pour nos territoires européens et plus spécifiquement belges. Il se concrétise par l’urbanisation massive de territoires périphériques de villes, appelés espaces périurbains. Cette urbanisation a des conséquences multiples, notamment en termes architecturaux et urbanistiques. Nous avons défini la forme périurbaine comme un état de l’évolution des espaces périurbains, formulé à partir de leurs composantes bâties et de leur organisation. Dans ce contexte, l’objectif principal de cette thèse est l’amélioration de la connaissance de la forme périurbaine. En d’autres termes, il s’agit de contribuer à l’émergence d’un cadre de réflexion sur l’actualité et l’avenir morphologique des espaces périurbains. Pour nous, il s’agit d’un préalable indispensable à la gestion des caractères architecturaux et urbanistiques de ces espaces. Afin d’apporter notre contribution à la construction de ce cadre de réflexion, nous avons structuré notre démarche scientifique autour de trois objectifs plus spécifiques. Ceux-ci structurent cette thèse. Le premier de ces objectifs est l’évaluation de la connaissance et de la reconnaissance des spécificités des espaces périurbains. Dans la première partie de cette thèse, nous nous sommes attaché à faire l’état de la connaissance des espaces périurbains et des concepts qui sont mobilisés pour les décrire. Ainsi, le second chapitre de notre dissertation dresse un bilan critique des connaissances relatives aux espaces périurbains. Dans le troisième chapitre, nous mettons en perspective le vocabulaire mobilisé dans leur description et leur gestion légale et opératoire. Le second objectif de cette thèse est le développement d’un outil d’analyse des tissus bâtis périurbains. Ainsi, le quatrième chapitre de la dissertation porte plus spécifiquement sur les formes périurbaines et leur analyse. Nous y développons la méthode d’observation et d’analyse morphologique de l’espace périurbain que nous avons construite et testée sur l’espace périurbain liégeois. Nous en explicitons le développement et en commentons les résultats. Cette méthode nous a permis de construire une typologie des tissus bâtis périurbains et, ainsi, de proposer un cadre de caractérisation de la forme périurbaine. Le troisième objectif est la proposition de scénarios prospectifs quant aux avenirs possibles de la forme périurbaine. Dans le cinquième chapitre de cette dissertation nous nous sommes intéressé à l’utilisation des résultats de la classification typologique à des fins de simulations prospectives. Sur base de ces résultats, nous avons construit des scénarios d’évolution potentielle de l’urbanisation périurbaine et de la forme périurbaine. [less ▲]

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See detailA Case Study for a Zero Impact Building in Belgium: Mondo Solar-2002
Attia, Shady ULg

in International Journal of Sustainable Building Technology and Urban Development (2012), 2(2), 137-142

This paper presents the Solar-2002 zero impact renovation project in Belgium. Its characteristics are based on fundamental principles taking advantage of natural resources by diverting the sun shine and ... [more ▼]

This paper presents the Solar-2002 zero impact renovation project in Belgium. Its characteristics are based on fundamental principles taking advantage of natural resources by diverting the sun shine and rain in the building design. The building has been renovated aiming to achieve principals of occupant health and comfort, energy efficiency, renewable energy production, resource conservation and reduction of environmental impacts. The paper reviews the design concepts including the passive and active strategies and compare building actual performance to actual monitoring results. Innovations related to architectural design, building system performance and simulation are presented. Results show that the house achieved energy and carbon neutral balance, closed water cycle and almost a cradle to cradle building material cycle. However, monitoring results shows the difficulty to maintain optimal thermal comfort during extreme summer and winter periods. Achieving the environmental zero impact objectives is not economically feasible without the subsidies from the federal and regional government. [less ▲]

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See detailModélisation du bilan de masse en surface du Svalbard avec le modèle régional MAR entre 1958 et 2010
Lang, Charlotte ULg

Conference (2012, March 07)

It is well known that high latitude zones are very sensitive to climate change. As a result of global warming, ice sheet melting has increased which in turn has an influence on climate through modifications ... [more ▼]

It is well known that high latitude zones are very sensitive to climate change. As a result of global warming, ice sheet melting has increased which in turn has an influence on climate through modifications of the thermohaline circulation, feedback of ice albedo, sea level rise,. . . Svalbard is an archipelago located between 74 and 81◦ lat N and 60 percent of its area (62 248 km2 ) is covered with glaciers and ice sheets. The impact of global warming on the Svalbard cryosphere can be estimated with climate models. However, we need to use regional climate models as they offer the possibility of a higher resolution than general circulation models. We have carried out a simulation of the Svalbard climate over the last 50 years (from 1958 to 2010) with the regional climate MAR model (tuned for the Greenland ice sheet) at a 10 km resolution forced with the ECMWF reanalysis. As validation, the modeled climate has been compared to near surface measurements at several weather stations through the archipelago. The results show a large interannual variability of the surface mass balance over Svalbard along with an increasing melting. The increase in temperature is responsible for the melting rate and the interannual variability is due to the variations of the mean summer temperature. [less ▲]

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