Projet ITAC - L'accessibilité au cégep pour tous : informatique et technologies adaptées dans les cégeps pour les étudiants ayant des handicaps /

Bibliogr

Étudiant(e)s de niveau collégial ayant des incapacités College students with disabilities

"La présente recherche a été subventionnée par le Ministère de l'éducation dans le cadre du Programme d'aide à la recherche sur l'enseignement et l'apprentissage (PAREA)"Titre de l'écran-titre (visionné le 8 déc. 2006)Également disponible en version papierBibliogr

Marques d’abrasion glacielles en milieu littoral hudsonien, Québec subarctique

Les plates-formes rocheuses littorales, dans toute région jadis occupée par les glaciers, portent nécessairement les traces d’une double activité glaciaire et glacielle. En Jamésie et en Hudsonie québécoises, des marques d’abrasion glacielles se superposent souvent aux formes glaciaires, en les recoupant entre autres, pour créer ainsi un véritable casse-tête pour l’observateur non averti, en particulier lorsque les directions de celles-là se multiplient, ce qui est surtout le cas. Ces marques dues à la glace flottante abondent sur les rivages basaltiques de la Grande île et des Manitounouc, en mer d’Hudson, où nous les avons levées; elles sont exceptionnelles par leur dimension, leur abondance et leur direction. Elles retiennent particulièrement l’attention lorsqu’on les rencontre sur d’anciens rivages, maintenant exondés, notamment ceux de la mer de Tyrrell et même du lac glaciaire Barlow-Ojibouai.Coastal rock-platforms, in any area once covered by glaciers, necessarily bear the marks of both glacial ice and drift ice. In the James Bay and Hudson Bay areas, Québec, drift ice marks are often found superimposed on glacial forms, intersecting them in various manners as well as running parallel to them, and become a real puzzle to the unexperienced observer, especially when the former face different directions, as is most often the case. These marks due to drift ice occur in great number on the basaltic shores of the Manitounouc Islands and of Long Island, in Hudson Bay, where we surveyed them. They are exceptional by their size as well as by their quantity and their direction. They are particularly remarkable on ancient shores, now emerged, especially those of the Tyrrell Sea and even those of glacial lake Barlow-Ojibway

Lysimetric study for environmental impact assessment of a treated soil

International audienc

ORP-assisted phytoremediation of hydrocarbon contaminated sediments

International audienceOn-site running waters are often sources of diffuse contamination around industrial sites that need to be treated to prevent detrimental effect to the adjacent environment. Settling process, such as sedimentary channels, is one way to limit pollutant spreading. However, in these specific media, pollution may accumulate and sediments become depositories of toxic substances. This project deals with the management of a sedimentary channel highly contaminated by hydrocarbons with the additional difficulty of proposing a solution preserving the nearby environment located within a Natural resource protection area. The aims of the treatment were i) to prevent contaminants mobility by degradation and/or stabilization and ii) to preserve the natural resources of the site. Among remediation process, phytoremediation is an all-encompassing term that includes a variety of techniques and strategies using higher plants that lead to contaminant degradation, removal, or immobilization, by removing contaminant sources, breaking exposure pathways between the source(s) and receptor(s). Furthermore, phytoremediation can be considering as a landscaping action within the global management of the site. Since anaerobic conditions of the sediment compartment is unfavorable to plant growth and organic compounds biodegradation, we proposed a new approach combining phytoremediation and the use of a calcium peroxide (CaO2) amendment to serve as an oxygen release product (ORP) in order to promote aerobic biodegradation and plant growth. Two experiments under controlled conditions in laboratory were performed: i) batch in vitro tests without plant in order to assess reactivity of the sediment with different ORP (ORP: IXPER75C, Solvay) levels and ii) plant growth assays with five selected species. The batch in vitro test showed a strong ORP-effect on physico-chemical parameters, with increasing pH and decreasing redox potential. Only the highest level of ORP enabled hydrocarbons degradation but resulted also in detrimental pH values for both microorganisms’ activity. pH increasing could also lead to strong negative effect on plant growth. Hydrocarbon dissipation was mainly attributed to oxidative processes. Lab plant growth experiments, with moderate levels of ORP to limit excessive pH increase, did not lead to any significant variation of hydrocarbon concentration. However, most of the tested species seemed to overcome the sediment detrimental growth conditions, confirming the phytoremediation feasibility for in situ application. Furthermore, ORP addition improved plant growth especially for Thalia dealbata and Scirpus lacustris. The absence of significant change in hydrocarbon content in sediments could be explained by the recalcitrant nature of the pollution a relative short term experiment. Organic chemistry characterization (GC analysis) revealed that hydrocarbon signature was marked by a large UCM (unresolved complex mixture) signal revealing an already aged and biologically stable pollution. Plant cover establishment should remain an asset in preventing sediment transfer, therefore insuring pollution stabilization, and in preserving the neighboring ecosystem

Lysimetric study of a treated soil for environmental risk assessment of the residual contamination

Lysimetric study of a treated soil for environmental risk assessment of the residual contamination. 2. Lysimeter Workshop for Global Change Research: Biological Processes and the Environmental Fate of Pollutant

Lysimetric study of a treated soil for environmental risk assessment of the residual contamination

Lysimetric study of a treated soil for environmental risk assessment of the residual contamination. 2. Lysimeter Workshop for Global Change Research: Biological Processes and the Environmental Fate of Pollutant

Gestion d’une terre traitée par bioremédiation : diagnostic in situ

National audienc

Gestion d’une terre traitée par bioremédiation : diagnostic in situ

National audienc

Évaluation<em> in situ</em> du risque associé au transfert de matière organique d’un sol traité en bioremédiation

Session 3 : Matières organiques et pollutionsNational audienc