Letteratura scientifica selezionata sul tema "Eau douce – Chimie"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Eau douce – Chimie".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Articoli di riviste sul tema "Eau douce – Chimie":
THÉVENON, Marie-France, Kévin CANDELIER e Jean-François TRÉBUCHON. "Printemps et Journées internationale et mondiale des forêts, du bois et de l’eau". BOIS & FORETS DES TROPIQUES 359 (29 febbraio 2024): 3–4. http://dx.doi.org/10.19182/bft2024.359.a37458.
Tesi sul tema "Eau douce – Chimie":
Daou, Claude. "Intérêt de l'analyse multidimensionnelle pour évaluer la qualité physicochimique et microbiologique d'eaux de rivieres en régime méditerranéen : cas des rivières Kadisha-Abou Ali et El Jaouz au Liban". Poitiers, 2006. http://www.theses.fr/2006POIT2365.
Aquatic ecosystems are often subject to continues and accelerated degrading processes which are primarily linked to anthropogenic activities. Lebanon, whose two rivers Kadisha-Abou Ali and El Jaouz are a focus of this study, has the most important water reservoirs in the Middle East. Currently, on behalf of the local authorities, the protection of this vital and strategic resources is receiving a significant amount of attention. The principal objective of this thesis is to establish, in Lebanon, one of the first databases to provide a methodology of water quality evaluation at physicochemical and microbiological levels. In a first part of this study, in which analytical parameters were considered separately, we showed that their spatial and temporal analysis make it possible to describe only one fraction of information related to water quality. Considering that anthropogenic effects modify hydrous balances of the aquatic ecosystems, the Principal Component Analysis proved to be a more suitable tool. From a microbiological position, the introduction of micro-organisms into an aquatic environment insignificantly modifies the hydrous balances. The problem which is primarily of an hygienic nature, is to take into account not only bacteria in water column but also the fixed bacteria on epilithic biofilms and to determine the viable, non-culturable bacteria which are potentially pathogenic
Portehault, David. "Synthèse par chimie douce en milieu aqueux d'oxydes de manganèse nano-structurés : des matériaux pour batteries au lithium ?" Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00812589.
Doledec, Sylvain. "Les peuplements de macroinvertébrés benthiques du cours inférieur de l'Ardèche : dynamique spatio-temporelle". Lyon 1, 1986. http://www.theses.fr/1986LYO19003.
Strydom, Jessica. "Étude de la production d’eau douce à partir de formations argileuses dans les zones de foothills". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0114.
With progressive compaction of the sediments, mineral and organic matter transformation are known to produce water that is less saline than the original pore water, which would have been similar in composition to ocean water. This freshening has been linked to over pressure generation as a consequence of the material transformation. The aim of our experimental investigation/work was to simulate the diagenetic processes of fluid and heat flow, and mechanical compaction that are involved in the freshening of formation water from a saturated clay sample. Our objective was to use the general water chemistry, as well as Cloride and Bromide isotopic tracers, to track the evolution of freshwater production with time.The large-scale oedometric compression cell that was developed for the purpose of this study is novel and rare due to the high fluid pressures, mechanical stresses and temperatures that could be applied on the clay samples during the experiments, and the multi-disciplinary collaboration between well-reputed laboratories in order to contribute to a functional understanding of Cl and Br behaviour in geological processes. There are no similar multi-disciplinary large-scale experiments in the literature.We did three compaction experiments that lasted up to around 200 days each during which we continuously recorded axial stress, pore fluid pressure, axial deformation, and the volumes of fluids in injection and collector pumps. The experiments constituted first saturating the clay with ocean water in the large oedomertic cell, and then compacting it in either 5 or 10 steps of increasing vertical stress and temperature up to 150 MPa and 150°C, while maintaining the pore fluid pressure as close as possible to 45 MPa. Continuously following the axial deformation, and monitoring the composition of the input and expelled water allowed for a water and chemical mass balance of the system. We could therefore calculate what the remaining pore water composition should be, with each consecutive compaction step. Furthermore, the state of the art modelling software, SURP, developed by the BRGM, helped us to understand what proportion of that expelled water, was the result of clay mineral dehydration. True mineral transformation was not observed. Neither through the modelling exercise, nor through XRD mineral characterization.We found that the chemistry and isotope behavior is considerably different between swelling clay (MX80 containing 75 wt% smectite) and non-swelling clay (Sainte Suzanne marl containing 61 wt% illite & 7 wt% kaolinite). In our study we observed a general decrease of the cation and anion concentrations in the expelled water for swelling clay while its concentration slightly increased in the remaining pore fluid. This was not the case for non-swelling clay. Then, more freshening of the expelled water occurred during the compaction MX80 experiment at higher temperature.We also observed that as Br is much more effectively filtered by the clays than chlorine due to its much lower natural occurrence, this translates to a larger range of isotopic fractionation for Br (δ81Br value of the expelled water from 0.9 ‰ up to 1.5‰) than for Cl (δ37Cl value of the expelled water from -0.1‰ down to -0.5‰), in all three compaction experiments.It is supposed that significant retention of Cl and Br in the pore water of the compacted MX80 is indicative of ultrafiltration and that the surface chemistry of the clay in combination with decreasing porosity result in re-equilibration of compressed and overlapping diffuse double layers which in part, drive the anion and isotope evolution. δ37Cl and δ81Br are promising tracers to better interpret the origin and evolution of formation waters in sedimentary basins
Falletti, Florence. "Etude de la régénération par microfiltration tangentielle sur membrane minérale des fluides de coupe aqueux et des solutions aqueuses de dégraissage". Montpellier 2, 1990. http://www.theses.fr/1990MON20230.
Nazarova, Cherriere Marfa. "Wettability study through x-ray micro-ct pore space imaging in eor applied to lsb recovery process". Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3030/document.
The aim of the thesis is to study rock wettability change effects caused by Low Salinity brine injection as tertiary recovery method. To identify the underlying mechanism or mechanisms of additional oil recovery X-Ray imaging technology was applied. We have also imaged the end-Point saturations of filled by brine and water core samples. Once the primary drainage is realized we carried out two phases imbibitions: with high salinity brine (waterflooding) and with low salinity brine (tertiary recovery mode). The wettability analysis at pore scale permitted to put in evidence the thermal and saline effects playing a decisive role in rock wettability. We have showed wettability changes are not caused by only electrical double layer expansion, however wettability changes was shown. These changes are explained by wettability transition of second order and observed not only for oil droplet on brine, but also for oil deposited on glass substrate. Finally, the pore space wettability needs to be evidenced at sub-Micrometric scale that is new for the petroleum domain
Maillette, Sébastien. "Agglomération et hétéroagglomération des nanoparticules d'argent en eaux douces". Thèse, 2015. http://hdl.handle.net/1866/12516.
Nanomaterials are a class of contaminants that are increasingly found in the natural environment. Their environmental risk will depend on their persistence, mobility, toxicity and bioaccumulation. Each of these parameters will depend strongly upon their physicochemical fate (dissolution, agglomeration) in natural waters. The goal of this paper is to understand the agglomeration and heteroagglomeration of silver nanoparticles in the environment. Two different silver nanoparticles (nAg; citrate coated and polyacrylic acid coated) with a diameter of 5 nm were covalently labelled with a fluorescent dye and then mixed with colloidal silicon oxides (SiO2) and clays (montmorillonite). The homo- and heteroagglomeration of the silver nanoparticles were then studied in waters that were representative of natural freshwaters (pH 7.0; ionic strength 10-7 to 10-1 M of Ca2+). Sizes were followed by fluorescence correlation spectroscopy (FCS) and results were validated using enhanced darkfield microscopy with hyperspectral imaging (HSI). Results have demonstrated that the polyacrylic acid coated nAg was extremely stable under all conditions, including in the presence of other colloids and at high ionic strength, whereas the citrate coated nAg formed heteroagregates in the presence of both natural colloidal particles.
England, Roxane. "Développement d’outils analytiques pour évaluer la biodisponibilité du Cd dans les eaux douces". Thèse, 2009. http://hdl.handle.net/1866/4702.
Phytochelatins (PC) are polypeptides having the general structure, (alpha-Glu-Cys)n-Gly, where n = 2 to 11. Many plants respond to an elevated concentration of metals in environment, particularly Cd, by synthesizing PC. The purpose of this study was to develop a tool to assess the bioavailability of the Cd in fresh water by determining phytochelatins in algae, C. reinhardtii, by online HPLC-ESI-MS/MS. The gold of this work was the validation of the analytical method i.e. the determination of the calibration curves and the limits of detection. The addition of dithiothreitol (DTT), 25 mM, was found to be necessary to maintain the PC in their reduced form for analysis. It was shown that the liquid chromatography coupled to tandem mass spectrometry (HPLC-ESI-MS/MS) technique has excellent potential for PC analysis, however, it will still requires some more work with respect to sample purification. Furthermore, the stability of the PC was evaluated for different sample storage temperatures. At all temperatures studied, some degradation of PC was observed possibly due to physical rather than chemical or bacterial reasons. Finally, the induction of phytochelatins (PC2, PC3 and PC4) was observed in C. reinhardtii for two Cd concentrations (10-7 M and 10-6 M) and for several induction times (1, 2, 4, and 6 h).
Libri sul tema "Eau douce – Chimie":
Erik, Eriksson. Principles and applications of hydrochemistry. London: Chapman and Hall, 1985.
Frank A. P. C. Gobas. Chemical Dynamics in Freshwater Ecosystems. Taylor & Francis Group, 2017.
Frank A. P. C. Gobas. Chemical Dynamics in Freshwater Ecosystems. Taylor & Francis Group, 2018.
Frank A. P. C. Gobas. Chemical Dynamics in Freshwater Ecosystems. Taylor & Francis Group, 2018.
Frank A. P. C. Gobas. Chemical Dynamics in Freshwater Ecosystems. Taylor & Francis Group, 2018.
Frank A. P. C. Gobas. Chemical Dynamics in Freshwater Ecosystems. Taylor & Francis Group, 2018.
Crompton, T. Roy. Organic Compounds in Natural Waters: Analysis and Determination. CRC Press, 2013.
Lefort, J. Traité de Chimie Hydrologique: Comprenant des Notions Générales d'hydrologie et l'analyse Chimique des Eaux Douces et des Eaux Minérales. Creative Media Partners, LLC, 2018.
Lefort, J. Traité de Chimie Hydrologique: Comprenant des Notions Générales d'hydrologie et l'analyse Chimique des Eaux Douces et des Eaux Minérales. Creative Media Partners, LLC, 2022.