Letteratura scientifica selezionata sul tema "Phases porteuses"
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Articoli di riviste sul tema "Phases porteuses":
Riviere, M., M. Rautureau, G. Besson, M. Steinberg e M. Amouri. "Complementarite des rayons X et de la microscopie electronique pour la determination des diverses phases d'une argile zincifere". Clay Minerals 20, n. 1 (marzo 1985): 53–67. http://dx.doi.org/10.1180/claymin.1985.020.1.05.
Chaton, Patrick, Bernard Maillere e François Jacq. "La recherche technologique, un enjeu pour les biothérapies et leur bioproduction". Annales des Mines - Réalités industrielles Novembre 2023, n. 4 (9 novembre 2023): 37–40. http://dx.doi.org/10.3917/rindu1.234.0037.
GARZOUN, Lotfi, e Samia HADDAD. "Rôle du réseau personnel dans l’identification et l’exploitation d’opportunités d’affaires". Management international 21, n. 1 (5 ottobre 2018): 58–71. http://dx.doi.org/10.7202/1052497ar.
Benyahia, Anis, Soraya Tebbal, Bouthayna Chiboub, Mourad Sadelaoud, Hocine Bouncer, Amira Housna Ameghchouche e Assia Aouachria. "Interest of the quantification of HBsAg in the chronic carrier of the hepatitis B virus". Batna Journal of Medical Sciences (BJMS) 7, n. 2 (9 novembre 2020): 137–41. http://dx.doi.org/10.48087/bjmsoa.2020.7216.
Veillette, Jean. "Déglaciation et évolution des lacs proglaciaires post-Algonquin et Barlow au Témiscamingue, Québec et Ontario". Géographie physique et Quaternaire 42, n. 1 (18 dicembre 2007): 7–31. http://dx.doi.org/10.7202/032706ar.
Gillerot, Alice, Philippe Jeanneaux e Etienne Polge. "The role of farmer collectives developing territorialized supply chains on the agroecological transition trajectories of farms: analysis using the quantified narratives method". Analyse de réseaux pour les sciences sociales Relational chains, Relational chains (16 maggio 2024). http://dx.doi.org/10.46298/arcs.10874.
Lorini, Maria Rosa, Amalia Sabiescu e Nemanja Memarovic. "Collective Digital Storytelling in Community-based co-design projects. An Emergent Approach". Journal of Community Informatics 13, n. 1 (22 marzo 2017). http://dx.doi.org/10.15353/joci.v13i1.3296.
Tesi sul tema "Phases porteuses":
Priadi, Cindy Rianti. "Caractérisation des phases porteuses : métaux particulaires en Seine". Paris 11, 2010. http://www.theses.fr/2010PA112288.
Ln freshwater systems, metals are known to have a particular affinity for the solid fraction. Consequently, the latter may constitute a potential toxic risk for aquatic organisms. Sustainable management in the Seine River Basin requires characterizing particulate carrier phase of metals in order to determine its geochemistry, identify urbanization impact of the Greater Paris Region and deduce the sources of metals and their mobility. To achieve these objectives, suspended particulate matter (SPM) was studied in relative to the water column and zoomed upon until the metal's molecular environment. Ln agreement to previous studies, lead (Pb) was associated mostly to the solid fraction while nickel (Ni) was found mostly in the dissolved phase. As for the rest of the metals such as cobalt (Co), chrome (Cr), copper (Cu), manganese (Mn) and zinc (Zn), there seems to be a shared preference for the solid and dissolved phase. Downstream Paris, not only did solid lsolution partitioning of Co, Cu and Ni decrease, but also temporal variation of the partitioning during monthly observations, indicating more stable forms of carrier phases. As for cadmium (Cd), Pb and Zn, it was their oxidizable fraction in the SPM that increased downstream, particularly associated with iron oxides (FexOy). An identified source of these oxides would be the bed sediment. Ln the case of intense storm episode, the combined wastewater system would overload and a large volume of direct wastewater would overflow to the Seine River. Calculation using a mixing model suggested that bed sediment contributed from 30-50% of particulate metal found in the overflow plume. This is a relatively high contribution compared to the 10-30% of particulate metal which would originate from the overflow itself. Besides iron oxides, reduced environment in bed sediment and CSO would also contribute to ZnS found in the water column. These ZnS are identified as single or clustered amorphous nanoparticles. This species is rather stable as they are found to persist in oxic environment
Poitevin, Antonine. "Caractérisation multi-échelles des phases porteuses des polluants métalliques Zn et Pb dans un sédiment mis en dépôt : de l'analyse de terrain au rayonnement synchrotron". Phd thesis, Université d'Orléans, 2012. http://tel.archives-ouvertes.fr/tel-00840257.
Bossy, Angélique. "Origines de l’arsenic dans les eaux, sols et sédiments du district aurifère de St-Yrieix-la-Perche (Limousin, France) : contribution du lessivage des phases porteuses d’arsenic". Limoges, 2010. https://aurore.unilim.fr/theses/nxfile/default/2e95ffd2-92b0-4376-aa7a-9206705f56ed/blobholder:0/2010LIMO4036.pdf.
In order to understand the pollution of waters in arsenic (As), it is important to know the biogeochemical processes involved in the transfer of this metalloid from the solid reservoir to waters. The aims were to evaluate (i) the contribution of As-rich solid phases weathering, from natural geochemical anomaly, through mineralogical characterization and (ii) the abiotic and biotic mobilization of As during hydrological monitoring and laboratory experiments. The soil profile showed a decrease of As bulk content during pedogenesis. Mineralogical characterization of the As-bearing phases showed an evolution in the soil profile from arsenates (Ba-rich pharmacosiderite) in the bedrock and the 135-165 cm soil horizon into Fe-oxyhydroxides (goethite, hematite and ferrihydrite) less and less rich in As towards the soil surface. The monitoring of dissolved As in the aqueous compartment showed the contribution of ground-, wetland and mine waters, runoff and soil solutions (in the surface horizons) to surface water pollution. Indeed, in situ monitoring of dissolved As in soil solutions showed a higher As release in the 0-5 cm soil horizon (25-119 μg. L-1) than in the deep soil horizons (6-56 μg. L-1), suggesting that As-bearing phases were less and less stable during pedogenesis. In addition to the physico-chemical mobilization, this study showed the influence of bacterial activity on As speciation in the waters of watershed, with the dissolved As(III) release before the Fe(II) in the groundwaters
Ilunga, Ngoy Serge. "Impact des termites sur les cycles biogéochimiques du cuivre et du cobalt dans le Katanga (RDC) - Application à la prospection minière". Electronic Thesis or Diss., Université de Lorraine, 2022. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2022_0207_ILUNGA_NGOY.pdf.
Knowledge of the influence of termites on transport of metals of economic interest within the complex of lithosphere, pedosphere and termite mounds is of great interest for geochemical and geological characterization of anomalies in mining prospection. Termites have an important functional role in the structuring of soils, causing chemical enrichment through the vertical transport of minerals exchanged between the deeper horizons and the termite mounds built at the surface. Our objective in this thesis is to evaluate the influence of termites on Cu and Co biogeochemical cycles in a mineral-rich region (Katanga, DRC), with the aim to optimize the utilization of termite mounds in mining prospection. This objective requires a characterization of mineral and organic phases at various scales. To achieve this, firstly, a geochemical mapping of termite mounds of two dominant genera of the region, Macrotermes and Cubitermes, was carried out at the landscape scale in an area that received a geological and soil and rock geochemical mapping. The utilization of termite mounds allowed the identification of lithogeochemical facies reflecting the subjacent geology on a regional scale according to the feeding habits of each termite genus. The spatial distribution of termite mounds also allowed us to follow Cu and Co content evolution according to study area geology. The combination of mineralogical and geochemical data acquired on Macrotermes falciger termite mounds and morphological and chemical characterization of their main constituents at microscopic scale allowed to identify carrier phases of interest metals in termite mounds materials. Similarly, the comparison of geochemical signatures of M. falciger termite mounds and their parent materials allowed to establish a lithogeochemical relationship, identifying the source of provisioning at depth by M. falciger. Finally, the association of geochemical characterization results of termite mounds for four granulometric fractions (0-20 µm; 20-63 µm; 63-200 µm; 200-2000 µm) and results on evaluation of the impact of termites on the constitution of aggregates in termite mounds and/or soils, allowed to specify the most informative granulometric fractions on the presence and mineralization of carrier phases of interest metals in Katanga in termite mound materials. The application of all these methods and all elements collected allowed us to propose a Cu and Co biogeochemical cycle scheme in this system, underlying the use of termite mounds in effective and efficient mining prospection
Deredempt, Olivier. "Étude comparative des algorithmes de recherche des phases de la porteuse et de l'horloge de bits d'un signal à modulation de phase". Toulouse, INPT, 1993. http://www.theses.fr/1993INPT150H.
Hallal, Ayman. "Génération d'ondes millimétriques et submillimétriques sur des systèmes fibrés à porteuses optiques stabilisées". Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S005/document.
I report in this manuscript a theoretical and experimental study of a compact, reliable and low cost source of 30 Hz linewidth, continuous and coherent electromagnetic waves tunable from 1 GHz to 500 GHz in steps of 1 GHz. These waves are generated by photomixing two distributed feedback (DFB) laser diodes at 1550 nm which are frequency stabilized with orthogonal polarizations on the same optical fibered Fabry-Perot cavity. I have designed very fast electronic control filters for each laser allowing a 7 MHz servo bandwidth limited by the loop length. I demonstrate phase noise suppressions down to -60 dBc/Hz at 1 kHz and -90 dBc/Hz at 100 kHz offset frequencies from a 92 GHz electrical carrier. I also measure a ~170 kHz frequency drift of the beat note at 10 GHz on the long term over a continuous 7.5 hour locking period. I show an optimized design of an integrated servo loop of few tens of cm length which reduces the phase noise by 18 dB at 1 MHz optical carrier offset frequency and the phase-amplitude couplings in the cavity by a factor of 50 compared to the experimental one. The addition of a third DFB laser phase stabilized on a local oscillator allows the possibility to have continuously tunable source over 1 THz. The continuous wave source also makes it possible to generate fixed repetition rate pico- or femtosecond pulses from highly non-linear and dispersive fibers, replacing the DFB lasers by further stable lasers. I have calculated by simulation 7.2 fs temporal jitter at 40 GHz repetition rate over a 1 ms integration time
Labidi, Tarek. "Amplification sensible à la phase de signaux analogiques sur porteuse optique". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS340/document.
Microwave photonic links are expected to play an important role in future RF systems. Based on low loss optical fibers, analog photonic links (APLs) have become the heart of the emerging field of microwave photonics, in which various functionalities are explored such as the generation and distribution of radar signals and local oscillators, phase shifting, reconfigurable true time delays, or even more complex functions such as spectrum analysis or correlation of RF signals. Unavoidably, microwave photonics systems undergo losses due either to microwave-to-optical conversion or to propagation. Classical amplifiers based on erbium doped fibers, semiconductor amplification, or Raman scattering in fibers, do not allow to compensate for these losses without degrading the signal-to-noise ratio. The aim of this thesis is to address this issue and to theoretically study and experimentally an optical phase-sensitive amplifier based on highly nonlinear fiber (HNLF) in order to amplify an analog signals without adding noise. We experimentally investigate the linearity of a phase sensitive amplifier based on nonlinear optical fiber in the context of microwave photonics. The linearity of the PSA amplifier is assessed by performing third order intermodulation distortion products (IMD3) measurements using two RF tones. The results show that the PSA is, in the explored domain, perfectly linear for the RF modulation, leading to amplification without any increase of distortion, thus proving the compatibility with future microwave photonics applications. In addition, we study the performance of our PSA in terms of noise by taking measurements of the noise figure (NF). Indeed, we measure a noise factor of -2.07 dB in the case where when we detect only the signal, while a 0.2 dB noise factor is obtained when both "signal and idler" are detected
Aksas, Madjid. "Égaliseur aveugle linéaire avec recouvrement simultané de la phase de la porteuse /". Montréal : École de technologie supérieure, 2003. http://wwwlib.umi.com/cr/etsmtl/fullcit?pMQ80816.
"Mémoire présenté à l'École de technologie supérieure comme exigence partielle à l'obtention de la maîtrise en génie électrique". Bibliogr.: f. [90]-92. Également disponible en version électronique.
Aksas, Madjid. "Égaliseur aveugle linéaire avec recouvrement simultané de la phase de la porteuse". Mémoire, École de technologie supérieure, 2003. http://espace.etsmtl.ca/736/1/AKSAS_Madjid.pdf.
Climent, Éric. "Dispersion de bulles et modification du mouvement de la phase porteuse dans des écoulements tourbillonnaires". Toulouse, INPT, 1996. http://www.theses.fr/1996INPT114H.
Atti di convegni sul tema "Phases porteuses":
García Casado, Margarita. "De Mektoub (1970) de Ali Ghanem à Harragas de Merzak Allouache: ce Mare nostrum, mer porteuse de civilisations à une mer tombeau." In XXV Coloquio AFUE. Palabras e imaginarios del agua. Valencia: Universitat Politècnica València, 2016. http://dx.doi.org/10.4995/xxvcoloquioafue.2016.3050.