Search results for "achat"
showing 10 items of 89 documents
L’actionnariat des salariés influence-t-il la rémunération des dirigeants ?
2017
International audience; Cet article étudie la relation entre les composantes variables de la rémunération en actions de l’entreprise des dirigeants et des actionnaires salariés. En utilisant un échantillon de données issu du SBF 120 sur la période 2004-2009, nous étudions en particulier : (i) la relation entre le montant des stock-options attribuées aux dirigeants et l’actionnariat salarié ; (ii) la relation entre le rapport du montant des stock-options sur la rémunération totale des dirigeants et l’actionnariat salarié. La relation est significativement négative dans les deux cas montrant que l’actionnariat salarié tend à limiter la composante stok-options de la rémunération des dirigeants…
The Eyjafjallajokull volcanic summit eruption: evidences from ash-leachates analysis and ground deposition fluxes
2012
The Eyjafjallajokull 2010 eruption was an extraordinary event in that it led to widespread over Europe. Volcanic processes which lead to eruptions can be investigated by monitoring a variety of parameters, including the composition of ash leachates. Fine-grained tephra erupted from active vents, and transported through volcanic plumes, can adsorbs, and therefore rapidly scavenge, volatile elements such as S, halogens, and metal species in the form of soluble salts adhering to ash surfaces. Analysis of such water-soluble phases is a suitable complement for the remote sensing of volcanic gases at inaccessible volcanoes, like Eyjafjallajokull. The 2010 Eyjafjallajokull eruption developed in fo…
The Influence of MSW Landfill Height in the Perched Leachate Formation
2012
During the last decades, the largest part of municipal solid waste (MSW) generated world wide has been disposed of in landfills without any pre-treatment. The main environmental impacts of such landfills, containing high amounts of biodegradable organic matter, are caused by emissions of liq-uid effluents and landfill gas. With no collection and treatment, leachates from landfills pollute groundwater and soils locally. Furthermore, besides the biological processes, many physical phe-nomena occur inside the landfill body which negatively affect landfill management. Indeed, the waste settlement inside the landfill body, with a consequent increase of its density, corresponds to a proportional …
A QUANTITY-QUALITY MATHEMATICAL MODEL FOR MUNICIPAL SOLID WASTE LANDFILL: MODEL CALIBRATION AND SENSITIVITY ANALYSIS
2015
Landfill leachate represents nowadays one of the most important issue related to the waste management cycle. Knowledge about leachate distribution and transport as well as fate of pollutants is fundamental for understanding the behavior of the landfill reactor. In the present study, a simple 1-D mathematical model was developed for the simulation of the vertical leachate fluxes throughout a landfill for MSW as well as the fate of inorganic pollutants within the landfill leachate pathway. The model was based on mass balance equations, which allowed to evaluate the moisture accumulation inside the landfill body as well as contaminant transport processes. The model enables to calculate the moi…
Effective Degradation of Cigarette Butts via Treatment with Old Landfill Leachates
2021
In this paper, results of feasibility study on microplastics (MPs) assessment in leachates from the Latvian solid municipal landfill Getliņi are discussed. The application of leachates for the treatment of cigarette butts (CGB) was evaluated. Methods of fluorescent microscopy, Fourier transform infrared (FTIR) spectroscopy and FTIR-microscopy were used for the identification and characterization of MPs in the leachates and analysis of CGB. Presence of the secondary MPs (e.g., degraded polyolefin mixtures) was determined in the tested landfill leachates, while cellulose acetate (CA) was not determined in these products. The leachates were tested as potential media for the thermophilic (55°C)…
Modeling of perched leachate zone formation in municipal solid waste landfills.
2010
The paper presents a 1D mathematical model for the simulation of the percolation fluxes throughout a landfill for municipal solid waste (MSW). Specifically, the model was based on mass balance equations, that enable simulation of the formation of perched leachate zones in a landfill for MSW. The model considers the landfill divided in several layers evaluating the inflow to and outflow from each layer as well as the continuous moisture distribution. The infiltration flow was evaluated by means of the Darcy’s law for an unsaturated porous medium, while the moisture distribution evaluation has been carried out on the basis of the theory of the vertically distributed unsaturated flow. The solu…
Mobility of Cr and V in Spent Oil Shale: Impact of Thermal Treatment
2013
Abstract Spent oil shale samples were evaluated for potential chromium and vanadium release upon aerobic combustion used in power generation, or anaerobic retorting used in shale oil recovery. Combusted samples released more Cr than retorted or raw samples due to chromate formation. The behavior of vanadium was just opposite in that more V was released from retorted than from aerobically combusted samples, probably due to reduced vanadyl cation formation.
La durabilité du périurbain dépendant de l'automobile au regard des pratiques d'achat en ligne des ménages
2014
ASRDLF2014 - 51ème colloque de l'Association de Science Régionale de Langue Française : Métropolisation, cohésion et performances : quels futurs pour nos territoires ?, CHAMPS-SUR-MARNE, FRANCE, 07-/07/2014 - 09/07/2014; International audience; La dépendance automobile des territoires périurbains liée à une absence de commerces et de services pose la question de leur soutenabilité, voire de leur durabilité à l'aube probable d'une augmentation importante et continue des prix des carburants. Internet et plus particulièrement la vente en ligne sont en mesure de fournir une alternative propice au maintien des ménages dans ces territoires. En effet, grâce au e-commerce, les ménages n'auraient pl…
Insatisfaction et restauration de la relation client-fournisseur par un système de management de la performance
2016
International audience; A travers une étude qualitative via la méthodologie de la recherche action, cet article permet d’enrichir les études existantes sur le management des relations client-fournisseurs en se focalisant sur la manière dont un fournisseur industriel, ici un bureau d’achats, réagit pour faire face au mécontentement de son client. Ce travail permet d’éclairer et de valider empiriquement le processus de résolution de conflit dans le but de maintien d’un client industriel. Nos résultats indiquent que le système de management de la performance combiné avec une communication régulière des résultats influence l’extension du contrat via son renouvellement.
Groundwater of Sicily (Italy) Close to Landfill Sites: Quality and Human Health Risk Assessment
2021
Groundwater close to three municipal solid waste landfill sites in Sicily (southern Italy) was sampled to determine the presence of contaminants and the risk associated with its possible use as drinking and sanitary water. Polycyclic aromatic hydrocarbons, polychlorinated biphenyls, polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans, and metals were investigated. These target compounds are the most common pollutants present in leachates. Risk Assessment Guidance for Superfund (RAGS, US EPA) was used to assess human health risk. Ingestion, dermal, and total exposure to these xenobiotic contaminants in groundwater were evaluated, and the cancer and non-cancer risk indexes were c…