Search results for "achat"
showing 9 items of 89 documents
Toxicity of waste dump leachates and sugar factory effluents and their impact on groundwater and surface water quality in the Opole Province in Poland
2000
A battery of Toxkit microbiotests with 4 aquatic species from different trophic levels has been used to evaluate the toxicity of 2 types of point source pollution in the Voivoidship of Opole in Poland: percolating waters from drainage systems of 4 municipal waste dumps and the effluents of a sugar factory. In addition, the toxicity of groundwaters from 2 wells near 2 waste dumps was also assessed. All the drainage waters of the waste dumps and the groundwaters near one dump (an unprotected landfill) showed toxic effects on all the test species, for samples taken in spring as well as in autumn. The well water of the (more recent) waste dump of the City of Opole in turn did not show any toxic…
Effective Recovery Process of Copper from Waste Printed Circuit Boards Utilizing Recycling of Leachate
2020
AbstractThis study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. Optimum leaching conditions for copper were found by using 3.6 mol L−1 sulfuric acid, 6 vol.% hydrogen peroxide, pulp density of 75 g L−1 with 186 min leaching time at 20°C resulting in complete leaching of copper followed by over 92% recovery and purity of 99.9% in the electrowinning. Study of chemical consumption showed total decomposition of hydrogen pero…
L'ÉMOTION ET LA RAISON : L'EFFET MODÉRATEUR DU GENRE SUR LE COMPORTEMENT D'ACHAT EN LIGNE
2018
RESUMEN: A pesar de la evidencia existente en torno a las diferencias entre mujeres y hombres en los procesos de toma de decisiones, así como en la adopción de la tecnología, la investigación llevada a cabo hasta la fecha no ha sido concluyente. El objetivo de este trabajo es estudiar las intenciones comportamentales de los consumidores según su género en los intercambios comerciales B2c. En este sentido, se propone identificar cómo el valor funcional -representando el raciocinio del consumidor-, el valor simbólico -representando la motivación emocional- y la confianza actúan como antecedentes de la intención de compra en el canal online. A partir de los resultados derivados de una investig…
The need for information in purchase situation and the information behavior in front of the shelf : use and effects of electronic interactive communi…
1999
The classic approach of buying behavior supposes that the consumption value derives from the evaluation of the technical, functionnal and symbolic features of the product. But, most of recents works use an experiential approach, for which the anticiped situation of consumption or use and the self concept are the essential elements of the consumption value. This thesis, devoted to information behavior in buying situation, attemps to conciliate these two paradigms until here opposite. The first part of this search investigates the concept of need for information. Its results, according to us, the activation ot two schemes, the first concerning the product acquisition, the second relative to t…
Rachats d’actions annoncés versus rachats réalisés:une analyse du découplage sur le marché français - Announced share repurchase versus repurchase sh…
2011
(VF)Notre analyse originale porte sur la pertinence des explications des rachats d’actions en confrontant les motivations des rachats annoncés au faible taux de rachats effectifs mesuré sur le marché français. Nous mobilisons les principales explications théoriques des rachats d’actions et nous proposons une étude empirique de plusieurs centaines de programmes de rachats afin de justifier l’intention volontaire des dirigeants de ne pas engager des rachats importants en dépit de ceux annoncés provoquant ainsi un découplage. Nous montrons que certaines entreprises ont une probabilité plus élevée de provoquer ce découplage en rachetant plus faiblement leurs propres actions. Ce sont les entrepr…
Dynamic of Components Leachate from Experimental Fertilizers in Leaching Test
2018
Organic matter contained in the waste of food industry or occurring in the households, in the absence of contamination with other kind of waste, may be used to create a “fertiliser”, which could be even reused in the organic production of arable crops. Particular attention is drawn to the fertilisers which may be applied in the case of amateur cultivation of pot plants and in the allotment gardens. The paper presents the results of research regarding the dynamics of the release of nutrients from tablets created with the help of encapsulation of the mixture manufactured from solvent extraction waste of coffee (SCG), modified by the ash obtained from low temperature burning of biomass. In thi…
Characterisation and treatment of waste incineration bottom ash and leachate
2012
Removal of silicon from CFB-derived fly ash leachate in the context of phosphorus recovery
2018
High concentrations of dissolved silica in the acid leachate impose two major challenges on precipitation based recovery of phosphorus (P). Firstly, co-precipitation of colloidal silica in the acidic regimes decreases the purity and value of precipitated P-products. In addition, silica scaling on internal surfaces of equipment is also a problematic issue in industrial operations. Therefore, removal of dissolved silica prior to P-recovery process minimizes the risks of Si-contamination in P-products and Si-scaling. In the present study, silica removal was achieved by accelerated silica polymerization with higher acidity and ionic strength of mineral acid, which also assisted the leaching of …