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Artykuły w czasopismach na temat "Développement de proxies"
Reddé, Michel. "Le développement économique des campagnes romaines dans le nord de la Gaule et l’île de Bretagne". Annales. Histoire, Sciences Sociales 77, nr 1 (marzec 2022): 105–45. http://dx.doi.org/10.1017/ahss.2022.41.
Pełny tekst źródłaDe Meutter, Pieter, Luc Gerard, Geert Smet, Karim Hamid, Rafiq Hamdi, Daan Degrauwe i Piet Termonia. "Predicting Small-Scale, Short-Lived Downbursts: Case Study with the NWP Limited-Area ALARO Model for the Pukkelpop Thunderstorm". Monthly Weather Review 143, nr 3 (27.02.2015): 742–56. http://dx.doi.org/10.1175/mwr-d-14-00290.1.
Pełny tekst źródłaGOUMBRI, Jean De Dieu, i Issa DIANDA. "Effect of economic institutions and the political environment on industrialisation in the WAEMU". Revue d’Economie Théorique et Appliquée 13, nr 2 (30.12.2023): 239–58. http://dx.doi.org/10.62519/reta.v13n2a6.
Pełny tekst źródłaBerti-Equille, Laure, i Rafael L. G. Raimundo. "Combining Ecological and Socio-Environmental Data and Networks to Achieve Sustainability". Biodiversity Information Science and Standards 7 (14.09.2023). http://dx.doi.org/10.3897/biss.7.112703.
Pełny tekst źródłaRozprawy doktorskie na temat "Développement de proxies"
Pesnin, Marie. "Apports des nouveaux traceurs d'anomalies isotopiques à l'étude des déséquilibres isotopiques dans les biocarbonates". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASJ033.
Pełny tekst źródłaBiocarbonates produced by marine organisms such as foraminifera or corals serve as important archives for studying past environments and climates. Since the work of H. Urey in 1947, it has been established that the oxygen-18 isotopic composition (δ18O) of carbonates reflects both the formation temperature and the isotopic ratio (18O/16O) of seawater. However, this relationship, supposedly based on the thermodynamic equilibrium between carbonate and water, can be disturbed by either environmental parameters or biological mechanisms. In certain organisms, such as corals, these "vital effects" manifest as significant isotopic disequilibrium, complicating the interpretation of a substantial portion of the fossil sedimentary record.In response to these challenges, this thesis adopts an innovative approach by leveraging new isotopic tracers, namely oxygen-17 anomalies (Δ17O) and "clumped isotopes" (Δ47, Δ48), in addition to traditional δ13C and δ18O measurements. By working with modern samples for which growth conditions are well documented, the additional constraints provided by these tracers allow for a better characterization of the factors influencing the isotopic composition of biocarbonates.This work began with an exploratory phase, aimed at (1) identifying the organisms/case studies by combining low spatial resolution isotopic measurements with in situ observations that provide mineralogical, elemental, and isotopic information at much higher resolution, and (2) establishing optimized experimental protocols for cutting-edge instrumental techniques used for Δ47/Δ48 measurements (via ultra-high sensitivity mass spectrometry) and Δ17O (via VCOF-CRDS, an innovative spectroscopic technology).The first part of this work resulted in the first published study on clumped isotopes in bryozoan skeletons. The results highlight a strong influence of mineralogy on the Δ47 signal, which seems to result from a simple thermodynamic effect. However, it appears that organisms from certain sites exhibit specific isotopic disequilibrium, potentially linked to local salinity. These findings raise new questions about the influence of certain environmental parameters on the activity of specific enzymes, particularly carbonic anhydrase, which plays a key role in maintaining isotopic equilibrium between water and dissolved inorganic carbon (DIC).The second part focuses on characterizing isotopic disequilibria in five isotopic dimensions (δ13C, δ18O, Δ17O, Δ47, Δ48) in cold-water corals, observed together here for the first time. The observations on Δ47 and Δ48 are consistent with a recent independent publication and align with a theoretical DIC model, suggesting that the isotopic signature of deep-sea corals is primarily controlled by kinetic effects related to the absorption of metabolic CO₂. However, the predictions of this same model are at odds with our Δ17O measurements (which have since been confirmed by independent observations), underscoring the need to revise certain model parameters.The richness of new questions raised by this thesis highlights the value of combining observations in a five-dimensional multi-isotopic space with quantitative theoretical models, while confronting these models with the biological specifics of each marine organism. This approach enables a deeper understanding of biomineralization mechanisms and allows for a more precise quantification of the influence of vital effects in biocarbonates on paleo-reconstructions