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See detailEffects of Eisenia fetida on metal uptake of heavy metals from polluted soils by Vicia faba and Zea Mays
Lemtiri, Aboulkacem ULg; Liénard, Amandine ULg; Francis, Frédéric ULg et al

Poster (2014, February 26)

Earthworms are known to increase availability of heavy metals in soils and also play an important role in maintaining the structure and quality of soil. The introduction of earthworms into soils ... [more ▼]

Earthworms are known to increase availability of heavy metals in soils and also play an important role in maintaining the structure and quality of soil. The introduction of earthworms into soils contaminated with metals has been suggested as an aid for phytoremediation processes. In Belgium (Wallonia), a century of industrial metallurgic activities produced significant heavy metal soil pollution. A large q u a n t i t y o f s m e l t e r w a s t e c r e a t e d a g r a d i e n t o f zi n c, lead and cadmium c o n c e n t r a t i o n . The objectives of our study were to evaluate : (i) the potential toxicity of heavy metal elements on the epigeic earthworms Eisenia fetida and on two plants Zea mays and Vicia faba and (ii) to determine the effects of the earthworms on the growth and contaminants phytoextraction process. The combination of behavioural factor measurements (survival, growth, reproduction of earthworms), physico-chemical parameters such as metal absorption, bioaccumulation by earthworms, soil physico-chemical changes, and plant responses (root and shoot elongation, dried biomass,…) provided a valuable indication of pollutant bioavailability and ecotoxicity. After 56-days exposure, the results suggest that adult earthworms have a strong tolerance for heavy metals exposure, but the responses depend on metal elements. Earthworms modify the bioavailable heavy metals in root and shoot in the contaminated soils and their activities alter shoot and root biomass of V. faba and Z. mays. The presence of earthworms led to a change in physico-chemical caracteristics in contaminated soils. These results show that the ecological context for phytoremediation should be broadened by considering earthwom – plant – soil interactions as they influence both plant health and absorption of heavy metals. [less ▲]

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See detailCosmological constraints on mirror matter parameters
Ciarcelluti, Paolo; Wallemacq, Quentin ULg

in Advances in High Energy Physics (2014), 2014

Up-to-date estimates of the cosmological parameters are presented as a result of numerical simulations of cosmic microwave background and large scale structure, considering a flat Universe in which the ... [more ▼]

Up-to-date estimates of the cosmological parameters are presented as a result of numerical simulations of cosmic microwave background and large scale structure, considering a flat Universe in which the dark matter is made entirely or partly of mirror matter, and the primordial perturbations are scalar adiabatic and in linear regime. A statistical analysis using the Markov Chain Monte Carlo method allows to obtain constraints of the cosmological parameters. As a result, we show that a Universe with pure mirror dark matter is statistically equivalent to the case of an admixture with cold dark matter. The upper limits for the ratio of the temperatures of ordinary and mirror sectors are around 0.3 for both the cosmological models, that show the presence of a dominant fraction of mirror matter, 0.06 < Ω_{mirror} h^2 < 0.12. [less ▲]

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See detailTransferts thermo hydriques dans les matériaux de construction
Kahlerras, Loubna ULg

Scientific conference (2014, February 25)

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See detailDrug-delivery implants : Pharmaceutical advantages and current processing technologies
Champeau, Mathilde; Jérôme, Christine ULg; Tassaing, Thierry

Scientific conference (2014, February 25)

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See detailEU-Brazil Relationship: achievements and difficulties
Santander, Sébastian ULg

Scientific conference (2014, February 25)

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See detailLe Nucléaire... Une énergie dans le vent? - Ciné-débat autour du film d'Alain de Halleux, Welcome to Fukushima
Parotte, Céline ULg

Speech (2014)

Ciné-débat autour du film Welcome to Fukushima en présence du réalisateur, Alain de Halleux et avec Pierre Dewallef, chargé de cours à la faculté des Sciences Appliquées dans le département d’aérospatiale ... [more ▼]

Ciné-débat autour du film Welcome to Fukushima en présence du réalisateur, Alain de Halleux et avec Pierre Dewallef, chargé de cours à la faculté des Sciences Appliquées dans le département d’aérospatiale et mécanique – ULg Céline Parotte, assistante-doctorante au Centre de recherche Spiral – ULg Pablo Servigne, animateur et chercheur en éducation permanente à l’asbl Barricade Débat animé par Jérôme Jamin,co-directeur de la Maison des Sciences de l'Homme-ULg Organisation : la Maison des Sciences de l'Homme (ULg), l'asbl Barricade et la Coopérative Courant d'Air, sous l'impulsion de Laurence Farine (membre de TerreMaCulture) et avec le soutien de Réjouisciences. [less ▲]

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See detailHistoire des musiques africaines-américaines- partim LE BLUES pre 1945
Sacré, Robert ULg

Conference given outside the academic context (2014)

Racines africaines du blues ; chanteuses de blues classique ; blues rural ( Mississippi, Texas, East Coast) , blues urbain ( Memphis, Saint Louis, Chicago) pre-1945

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See detailLes femmes migrantes et leur rôle dans la transmission des savoirs culinaires et des soins du corps.
Mescoli, Elsa ULg

Conference given outside the academic context (2014)

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See detailDark atoms and the positron-annihilation-line excess in the galactic bulge
Cudell, Jean-René ULg; Khlopov, Maxim; Wallemacq, Quentin ULg

in Advances in High Energy Physics (2014), 2014

It was recently proposed that stable particles of charge -2, O^{--}, can exist and constitute dark matter after they bind with primordial helium in O-helium (OHe) atoms. We study here in details the ... [more ▼]

It was recently proposed that stable particles of charge -2, O^{--}, can exist and constitute dark matter after they bind with primordial helium in O-helium (OHe) atoms. We study here in details the possibility that this model provides an explanation for the excess of gamma radiation in the positron-annihilation line from the galactic bulge observed by INTEGRAL. This explanation assumes that OHe, excited to a 2s state through collisions in the central part of the Galaxy, de-excites to its ground state via an E0 transition, emitting an electron-positron pair. The cross section for OHe collisions with excitation to 2s level is calculated and it is shown that the rate of such excitations in the galactic bulge strongly depends not only on the mass of O-helium, which is determined by the mass of O^{--}, but also on the density and velocity distribution of dark matter. Given the astrophysical uncertainties on these distributions, this mechanism constrains the O^{--} mass to lie in two possible regions. One of these is reachable in the experimental searches for stable multicharged particles at the LHC. [less ▲]

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See detailÉvolutions multiples et intérêts nouveaux en matière de climatologie depuis 1970.
Erpicum, Michel ULg

Scientific conference (2014, February 25)

Evolution of the knowledge of the main variables of the climates of the Earth according to the recent evolution of the principal tools of climatology and instrumental data coming from international or ... [more ▼]

Evolution of the knowledge of the main variables of the climates of the Earth according to the recent evolution of the principal tools of climatology and instrumental data coming from international or national networks or from experimental measurements conducted in Climatological or Meteorological Institutes. [less ▲]

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Peer Reviewed
See detailDetection of eye movements specific to drowsiness and their relation with subjective assessment of sleepiness in PVT: A cognitive ergonomic approach
Blavier, Adelaïde ULg; Montagnino, Cédric; Wertz, Jérôme ULg et al

Conference (2014, February 24)

Drowsiness is one of the major factors explaining accidents, particularly in traffic accidents but also in work situations with serious consequences (e.g. medicine). The drowsiness may be assessed by ... [more ▼]

Drowsiness is one of the major factors explaining accidents, particularly in traffic accidents but also in work situations with serious consequences (e.g. medicine). The drowsiness may be assessed by diverse measures that vary from physiological and unconscious data (e.g. EEG) to subjective and conscious evaluation. In their daily life, people are used to evaluate their drowsiness by subjective assessment and research observes a great inter-individual variation in this evaluation. Moreover, the subjective evaluation is dependent on the situation and the risk perceived by the person (e.g., new versus usual situations, simple versus complex environments, etc.). In this theoretical context, our purpose was to investigate the links between 1) objective performance (reaction time) measured by a psychomotor vigilance task (PVT), 2) data from eye movements and 3) subjective assessment of drowsiness (measured with Karolinska Sleepiness Scale, KSS). 12 persons, aged from 20 to 56, participated individually. They were asked to respect a 60% sleep deprivation during the night before the experiment and to not drink any energy drinks the day of the experiment. The experiment was conducted between 1 and 3 PM after a heavy lunch in order to increase the circadian effect. Moreover, the temperature of the room was 25° in order to increase drowsiness. Each participant was asked to perform 4 PVT. However, although 100% of participants performed the first two PVT, only 66% were able to perform the third PVT and only 33% of participants performed the fourth and last PVT. Our results showed an effect of time on objective performance, eye movements and subjective assessment of drowsiness in PVT 1 and 2: significant increase of reaction time, increase of eye closure and perclos, reduction of pupil diameter and increase of subjective drowsiness estimation (KSS). Only the frequency and duration of blinks remained constant across time. In PVT 3 and 4, data from eye movements and objective performance (reaction time) did not vary anymore across the time. Only the subjective estimation of drowsiness (KSS) continued to increase. Furthermore, subjective estimation of drowsiness was differently correlated with eye movements and objective performance across the PVT; it was significantly correlated with reaction time (PVT 1,2,3), blink frequency and duration (PVT 1,2,3), perclos (PVT 1,2,3,4), eye closure (PVT 2,3), pupil diameter (PVT 1,2,3,4). These results are discussed and integrated in an ergonomic approach in order to analyze the links between objective performance, eye movements and subjective assessment of drowsiness. [less ▲]

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See detailcompte rendu de : Paul Schubert, Pierre Ducrey, Pascale Derron (ed.), Les Grecs héritiers des Romains
Rochette, Bruno ULg

in Bryn Mawr Classical Review [=BMCR] (2014)

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See detailLa transmission entre générations de l'héritage culturel et migratoire.
Mescoli, Elsa ULg

Conference given outside the academic context (2014)

Detailed reference viewed: 12 (1 ULg)
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See detailAssessing the Thermal Performance of Bedouin Tents in Hot Climates
Attia, Shady ULg

in ASHRAE Energy & Indoor Environment for Hot Climates (2014, February 24)

The aims of this study it to improve conditions inside Bedouin tents shelters and to develop tools to assess shelter quality and comfort. A prototype tent was tested in hot conditions with an internal ... [more ▼]

The aims of this study it to improve conditions inside Bedouin tents shelters and to develop tools to assess shelter quality and comfort. A prototype tent was tested in hot conditions with an internal vapor load. Temperature, humidity measurements and air speed were taken inside the shelter while the external temperature was maintained at 40°C (104°F). Building performance simulation was conducted to produce a simulation model. A model of a tent was constructed using the EnergyPlus simulation software and were calibrated with the test data. The shelter models were simulated in Wadi Rum, Jordan using real data from. The feasibility of heating the tent using only the casual gains from occupants and solar radiation was investigated, although it was found that a tent heated in this way would only be appropriate in spring and autumn. Design issues included coping with stratification of air temperature inside the tent, improving thermal comfort without compromising fabricating the materials cheaply and simply. The validity of the results is limited by the lack of measured data for rates of air infiltration. [less ▲]

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See detailStrategic Decision Making For Zero Energy Buildings in Jordan
Attia, Shady ULg; Zawaydeh, Samer

in Proceedings of the 1st International Conference on Energy & Indoor Environment for Hot Climates (2014, February 24)

This paper presents the results of combined economic and computational study of different integrated passive and active design strategies for the Jordanian residential building sector. A representative ... [more ▼]

This paper presents the results of combined economic and computational study of different integrated passive and active design strategies for the Jordanian residential building sector. A representative house prototype, located in Amman is selected as a case study for the zero energy design and performance objective. The aim of the study is to investigate the potential of achieving thermal comfort and delivering thermal and electrical energy demands for existing buildings on site for different Jordanian Cities. Jordan has a semi-arid climate with an annual total irradiation above 2000 bankable kWh/m2 per year with approximately 2000 hours of full sunshine. Therefore, different passive and active design strategies are discussed and compared to reach an annual net zero energy demand for the existing building stock. In order to achieve zero energy buildings certain strategies are examined. For example, internal loads reduction, envelope insulation in addition to the installation of solar water heater and photovoltaic. Based on a month-by–month demand analysis, internal loads and envelope performance are analyzed in order to explore the existing economical potential. Simulation software DesignBuilder is used to examine the strategies proposed to achieve annual net zero energy performance for a prototype. The final result of this study compares the potential and constraints of each strategy and assesses them based on economical feasibility. For the considered location and weather conditions the prototype can provide thermal comfort for occupants and meets the zero energy objectives. The research also proofs that some strategies are cost effective rewarding with a payback period ranging from 3 to 9 years. [less ▲]

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See detailInvestigating the Impact of Different Thermal Comfort Models for Zero Energy Buildings in Hot Climates
Attia, Shady ULg; Hensen, JLM

in Proceeding of: Conference on Energy and Indoor Environment for Hot Climates (2014, February 24)

The selection of a thermal comfort model has a major impact on energy consumption of Net Zero Energy Buildings (NZEBs) in hot climates. The objective of this paper is to compare the influence of using ... [more ▼]

The selection of a thermal comfort model has a major impact on energy consumption of Net Zero Energy Buildings (NZEBs) in hot climates. The objective of this paper is to compare the influence of using different comfort models for zero energy buildings in hot climates. The paper compares the impact of applying Givoni’s model, ASHRAE 55 adaptive comfort standard, EN 15251 adaptive comfort standard and EN ISO 7730 on energy consumption and comfort. Using ZEBO and EnergyPlus for energy simulation, an existing prototype of a residential apartment module will be used to evaluate energy performance and thermal comfort in two parametric series. The first one is the result of coupling natural ventilation and mechanical cooling and the second one is guided coupling natural ventilation, mechanical cooling and ceiling fans. Results show a significant difference of cooling loads and total energy generation for the compared comfort models. However, the study remains theoretical and requires post occupancy evaluation for a better reliability of the results. [less ▲]

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See detailThe Usability of Green Building Rating Systems in Hot Arid Climates
Attia, Shady ULg

in ASHRAE Energy & Indoor Environment for Hot Climates (2014, February 24)

To develop adaptable and context sensitive building rating systems, the present work aimed to evaluate four rating systems that emerged recently in the Middle East. Literature review and cross comparison ... [more ▼]

To develop adaptable and context sensitive building rating systems, the present work aimed to evaluate four rating systems that emerged recently in the Middle East. Literature review and cross comparison analysis showed that the four examined rating systems namely, Green Pyramid Rating System (Egypt), Green Building Standard SI 5281 (Israel), Qatar Sustainability Assessment System (QSAS) and Pearl Building Rating System (UAE) are not enough adopted to local environmental, cultural, historical, societal and economic context. They showed also a comparable similarity since they all imitate the American LEED and British BREEAM rating systems. The paper elaborates on the comparison results and presents recommendations to improve the questioned rating systems and remind designers with the principles and strategies of sustainable design that goes beyond the existing rating systems in hot climate. The evaluation of the four systems might provide a new approach for regional harmonization among the four systems and the development of adaptable and context sensitive rating system. [less ▲]

Detailed reference viewed: 157 (5 ULg)