Cadre de référence gouvernemental en gestion intégrée des documents au Gouvernement du Québec : entre la loi et la technique (Le)

Intervention au colloque "Le numérique : impact sur le cycle de vie du document", organisé à l\u27université de Montréal par l\u27EBSI et l\u27ENSSIB du 13 au 15 octobre 2004. La bonne gestion de l\u27information est une des conditions de la performance des organisations. Les outils traditionnels élaborés pour la documentation papier sont désormais inadéquats face au développement de la documentation numérique dans les administrations. Ce phénomène entraîne nombre de problèmes bien connus : la prolifération de documents numériques de divers formats, statuts, natures et versions, sur les ordinateurs individuels ou institutionnels de l\u27organisation. Cette prolifération peut facilement mener à une piètre performance de l\u27organisation dans la gestion de ses connaissances, à la perte de documents importants, à une contribution sous-optimale à la préservation du patrimoine informationnel collectif et à une faible confiance des partenaires d\u27affaires. Face à cette situation, le Gouvernement du Québec a souhaité se doter d\u27une vision, de méthodes et d\u27outils pour mieux gérer ses documents sur tous supports, incluant les supports numériques. C\u27est l\u27objectif du projet de Cadre de référence gouvernemental en gestion intégrée des documents (CRGGID)

Transitions - Note 5

Note complète ; Résumé ; Capsule 5 : L'influence des aspirations scolaires sur l'accès aux études postsecondaires

Experimental study of the temperature effect on two-phase flow properties in highly permeable porous media: Application to the remediation of dense non-aqueous phase liquids (DNAPLs) in polluted soil

The remediation of aquifers contaminated by viscous dense non-aqueous phase liquids (DNAPLs) is a challenging problem. Coal tars are the most abundant persistent DNAPLs due to their high viscosity and complexity. Pump- ing processes leave considerable volume fractions of DNAPLs in the soil and demand high operational costs to reach cleaning objectives. Thermally enhanced recovery focuses on decreasing DNAPL viscosity to reduce resid- ual saturation. The oil industry has previously applied this technique with great success for enhanced oil recovery applications. However, in soil remediation, high porous media permeabilities and product densities may invali- date those techniques. Additionally, the impacts of temperature on coal tar’s physical properties have not been thoroughly discussed in available literature. Here, we investigated how coal tar’s physical properties, the capillary pressure-saturation curve and the relative permeability of two-phase flow in porous media depend on the temper- ature and flow rate experimentally. Drainage and imbibition experiments under quasi-static (steady-state) and dynamic (unsteady-state) conditions have been carried out at 293.15 K and 323.15 K in a 1D small cell filled with 1 mm homogeneous glass beads. Two different pairs of immiscible fluids have been investigated, coal tar-water and canola oil-ethanol. Results demonstrated similar trends for temperature effect and values of fluid properties for both liquid pairs, which backs up the use of canola oil-ethanol to model coal tar-water flow. It was found that there is no temperature effect on drainage-imbibition curves or residual saturation under quasi-static conditions. In dynamic conditions, the DNAPL residual saturation decreased by 16 % when the temperature changed from 293.15 K to 323.15 K. This drop was mainly linked to decreasing viscous fingering, as well as the appearance of wetting phase films around the glass beads. Both phenomena have been observed only in dynamic experiments. A high enough pumping flow rate is needed to generate dynamic effects in the porous medium. Ethanol and oil’s relative permeabilities also increase with temperature under dynamic measurement conditions. Our findings in- dicate that flow rate is an important parameter to consider in thermal enhanced recovery processes. These effects are not taken into account in the classically used generalized Darcy’s law for modeling two-phase flow in porous media with temperature variation

Multiphase multicomponent modelling of the NAPL transfer in the subsurface using Method of Lines

This paper presents the three dimensional multicomponent multi-phase simulator CUBICM (M3 ) combining reactive transport and mass transfer modules. The main purpose of this tool is to evaluate and quantify Non-Aqueous Phase Liquid (NAPL) plume attenuation by soil microorganisms and kinetic mass transfer processes such as dissolution, volatilization, sorption. Physical, biological and numerical concepts are given here in a fully embedded method of lines scheme using control volume finite element. The aim of the developed numerical code is to allow a flexible selection of physical formalisms via a dedicated Graphical User Interface in order to study the fate of pollutants in time and space. Various test cases are then illustrated with 2D and 3D semi-realistic heterogeneous configurations

LptM promotes oxidative maturation of the lipopolysaccharide translocon by substrate binding mimicry

Insertion of lipopolysaccharide (LPS) into the bacterial outer membrane (OM) is mediated by a druggable OM translocon consisting of a β-barrel membrane protein, LptD, and a lipoprotein, LptE. The β-barrel assembly machinery (BAM) assembles LptD together with LptE at the OM. In the enterobacterium Escherichia coli, formation of two native disulfide bonds in LptD controls translocon activation. Here we report the discovery of LptM (formerly YifL), a lipoprotein conserved in Enterobacteriaceae, that assembles together with LptD and LptE at the BAM complex. LptM stabilizes a conformation of LptD that can efficiently acquire native disulfide bonds, whereas its inactivation makes disulfide bond isomerization by DsbC become essential for viability. Our structural prediction and biochemical analyses indicate that LptM binds to sites in both LptD and LptE that are proposed to coordinate LPS insertion into the OM. These results suggest that, by mimicking LPS binding, LptM facilitates oxidative maturation of LptD, thereby activating the LPS translocon

Numérique : impact sur le cycle de vie du document (Le)

Actes du colloque "Le numérique : impact sur le cycle de vie du document" organisé à l\u27université de Montréal par l\u27EBSI et l\u27ENSSIB du 13 au 15 octobre 2004. Son objectif était de traiter de façon interdisciplinaire la problématique suivante : « La numérisation, la diffusion des formats numériques originaux, les nouvelles méthodes d\u27indexation et d\u27analyse du document ainsi que le fonctionnement en réseau changent les données de base de la vie du document qui devient une sorte de phénix incessamment renaissant » (programme du colloque)