Letteratura scientifica selezionata sul tema "Tritium – Teneur en hydrogène"
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Articoli di riviste sul tema "Tritium – Teneur en hydrogène":
GUEGUEN MINERBE, M., I. NOUR e T. CHAUSSADENT. "Devenir des structures en béton en présence d’H2S – Vers une évolution des classes d’exposition". Techniques Sciences Méthodes, n. 10 (20 ottobre 2020): 45–50. http://dx.doi.org/10.36904/tsm/202010045.
Hubert, P., P. Olive e S. Ravailleau. "Estimation pratique de l'âge des eaux souterraines par le tritium". Revue des sciences de l'eau 9, n. 4 (12 aprile 2005): 523–33. http://dx.doi.org/10.7202/705265ar.
Gautier, S., e A. Quignard. "Résonance magnétique nucléaire 1H basse résolution. Le meilleur outil pour une détermination précise de la teneur en hydrogène des produits pétroliers". Revue de l'Institut Français du Pétrole 50, n. 2 (marzo 1995): 249–82. http://dx.doi.org/10.2516/ogst:1995020.
Brass, A. M., e J. Chêne. "Application du deutérium et du tritium à la mesure de la concentration locale en hydrogène dans les métaux en relation avec les risques de fragilisation". Revue de Métallurgie 92, n. 12 (dicembre 1995): 1383–97. http://dx.doi.org/10.1051/metal/199592121383.
Tesi sul tema "Tritium – Teneur en hydrogène":
Bacchetta, Audrey. "Analyse et spéciation du tritium dans des matrices environnementales". Electronic Thesis or Diss., Paris 6, 2014. http://www.theses.fr/2014PA066026.
This study deals with environmental monitoring. The main aims are (i) the optimisation of the analytical procedure for the tritium in organic form determination, and (ii) the identification of the tritium bearing molecules which are responsible for its transfer from the environment to man. The study was divided into three stages. First an analytical method was developed to determine hydrogen content of several samples, which is a key element to calculate accurate organically bound tritium activities. Secondly, the impact of the organically bound tritium fractions separation (labile exchange) for the determination of the representative fraction of the level of environmental tritium activity was then evaluated. For that, the amount of solubilised sample was estimated. Finally, the speciation of tritium in environmental samples was investigated. Several molecules classes and organic compounds dissolved in the labile exchanges solvent were identified. The results show that the distribution of tritium in organisms depends on both properties of the chemical bond in which it is involved and chemical properties of tritium bearing molecules. The identified compounds belong to the molecules classes such as carbohydrates or amino acids, constitutive of living organisms. It would now be of interest to study the tritium distribution in an environmental sample to target molecules of interest and study the impact of tritium from the environment to man
Paul, Alexia. "Dynamique couplée de l’hydrogène et du carbone organiques des sols : approches par isotopes stables pour la prévision du devenir du 3H, 2H, 13C et 14C". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0068/document.
Radiocarbon (14C) and tritium (3H) are naturally released into the environment but also through nuclear activities. The releases are expected to persist for the next decades, it is important to predict their fate and their residence time in soils. The objective of this thesis is to propose a quantitative prediction and a simple modeling of the fate of 14C and 3H in soil organic matter (SOM). The originality of this work is twofold: first, we hypothesize that the incorporation and fate of NEH atoms in the soil are coupled to the carbon dynamics. Second, we chose to trace carbon and hydrogen by natural or artificial 13C and 2H tracing.Through natural in situ 13C tracing, we quantified the carbon recently incorporated by vegetation in few decades. Deep horizons contain a large part of this carbon (typically 20 to 30%). We adapted the RothC model to the deep soil C dynamics. This allowed us to predict that 10% of C will persist for several centuries in the deeper layers. The labelling experiments showed that the microbial activity is driving the incorporation of hydrogen from water into SOM, and allowed us to establish the CH stoichiometry of biotransformations. These experiments were a mean to propose a model of the coupled C and H dynamics of the SOM in the short and medium term (decades). The results of this thesis contribute as well to the improvement of the interpretation of natural abundances in 13C and 2H stable isotopes. A meta-analysis of the correlations between the 13C and 14C concentrations of global soils has demonstrated that the 13C enrichment of deep organic matter can be fully explained by the 13C/12C ratio of the vegetation from which they are derived
Nivesse, Anne-Laure. "Spéciation du tritium organiquement lié dans les matrices environnementales". Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2020. http://www.theses.fr/2020IMTA0216.
Tritium is the radioactive isotope of hydrogen and can thus integrate the organic molecules of a living organism following the water cycle and form the organically bound tritium fraction (OBT). The existence of two forms of OBT is commonly accepted: an exchangeable fraction (E-OBT) and a non-exchangeable fraction (NE-OBT). However, a scientific consensus to date is lacking to describe the exact distribution of these two forms in an organic molecule, which generates controversies and a lack of clarity on the behavior of tritium in the environment. Therefore, this study consists first of all in establishing and understanding the involvement of specific molecular structures of the usual biomolecules of plant biomass on the speciation of OBT in environmental matrices. An overview is obtained on the exchange capacities of the hydrogen atom found in a large panel of environmental matrices and their major constituent. A major interest is focused on the cellulose molecule with its semi-crystalline structure and the storage capacities of tritium in soils are explored through a study of the exchange and deprotonation capacities of hydrogen atoms in matter rich in humic substances. Secondly, a comparative study is proposed between two isotopic exchange methods for the analysis of the NE-OBT fraction and their reliability is evaluated within the environmental monitoring scope, but also for the apprehension of the distribution of OBT in environmental matrices
Moysan, Isabelle. "Application des solutions solides à base de palladium, platine et rhodium au stockage solide des isotopes de l'hydrogène : structure électronique, stabilité sous hydrogène et vieillissement sous tritium". Dijon, 2001. http://www.theses.fr/2001DIJOS037.
Boyer, Cécile. "Étude des transferts du tritium atmosphérique chez la laitue: étude cinétique, état d'équilibre et intégration du tritium sous forme organique lors d'une exposition atmosphérique continue". Phd thesis, Université de Franche-Comté, 2009. http://tel.archives-ouvertes.fr/tel-00464333.
Trentin, Valérie. "Séparation des isotopes de l'hydrogène par chromatographie en phase gazeuse". Vandoeuvre-les-Nancy, INPL, 1992. http://www.theses.fr/1992INPL079N.
Stephant, Alice. "Le Rapport isotopique de l'hydrogène dans le système solaire interne : à la recherche des sources physico-chimiques de l'eau planétaire". Paris, Muséum national d'histoire naturelle, 2014. http://www.theses.fr/2014MNHN0022.
Current dynamical models of Solar System formation and geochemical models agree on a likely chondritic origin for the terrestrial water. Indeed, primitive meteorites, called chondrites, have undergone an aqueous alteration process on their parent bodies. Moreover, these meteorites are one of the considered sources for the existence of water in lunar minerals. This thesis lies on hydrogen isotopic ratios and water contents measured using NanoSIMS in the carbonaceous chondrite Paris and lunar soils from the Apollo missions. Chondrules in Paris meteorite seem to have registered a water source distinct from the one of the parent body aqueous alteration. For the moon, water retained in soils is majority formed by implantation of the solar wind hydrogen
Mahloul, Noureddine. "Influence des impuretés soufre et phosphore sur les propriétés des alliages fer-nickel-carbone : conséquences vis-à-vis des mécanismes de fragilisation par l'hydrogène". Châtenay-Malabry, Ecole centrale de Paris, 1996. http://www.theses.fr/1996ECAP0443.
Lanier, Sandy. "Mise au point d’un mortier de piégeage à réseau poreux contrôlé". Thesis, Centrale Lille Institut, 2020. http://www.theses.fr/2020CLIL0027.
This PhD is part of the MACH3project funded by the French Investment Plan (PIA) -2nd phase. It contributes to the management of tritiated radioactive waste produced by the ITER fusion facility. The acceptance of this waste on a storage site requires a low rate of degassing of Tritium (radioactive isotope of H2). This research has developed cement mortars for conditioning tritiated nuclear waste,making it possible to limit the degassing of tritium by irreversible trapping of its gaseous forms. Composite mortars were formulated, based on conventional Portland cement, and integrating a hydrogen getter (Ag2O/MnO2), meeting the safety criteria of a radioactive waste storage facility and complying with the industrial specifications. After three months of maturation, their trapping performance, without preliminary drying, is between 75 and 95% (measured following a gamma irradiation test, generating H2in situ)
Azinheira, José. "Caractéristiques locales dans des écoulements réactifs : détermination des masses volumiques et populations rotationnelles par des techniques laser". Châtenay-Malabry, Ecole centrale de Paris, 1986. http://www.theses.fr/1986ECAP0002.
Libri sul tema "Tritium – Teneur en hydrogène":
Pulat. Determination of hydrogen in materials: Nuclear physics methods. Berlin: Springer-Verlag, 1989.
1936-, Davis E. A., e Cox S. F. J, a cura di. Protons and muons in materials science. London: Taylor & Francis, 1996.
1930-, Gschneidner Karl A., e Eyring LeRoy, a cura di. Handbook on the physics and chemistry of rare earths. Amsterdam: North-Holland, 1993.
Gschneidner, Karl A. Handbook on the Physics and Chemistry of Rare Earths : Volume 24 (Handbook on the Physics and Chemistry of Rare Earths). North Holland, 1997.
Gschneidner, Karl A. Handbook on the Physics and Chemistry of Rare Earths : Volume 8. Elsevier Science Ltd, 1986.
Gschneidner, Karl A. Handbook on the Physics and Chemistry of Rare Earths : Volume 16 (Handbook on the Physics and Chemistry of Rare Earths). North Holland, 1993.
Gschneidner, Karl A. Handbook on the Physics and Chemistry of Rare Earths : Volume 12. Elsevier Science Pub Co, 1989.
Gschneidner, Karl A. Handbook on the Physics and Chemistry of Rare Earths: Cumulative Index, Volumes 1-15. Elsevier Science Pub Co, 1993.
Gschneidner, Karl A. Handbook on the Physics and Chemistry of Rare Earths : Volume 9 (Handbook on the Physics and Chemistry of Rare Earths). North Holland, 1987.
Gschneidner, Karl A. Handbook on the Physics and Chemistry of Rare Earths : Volume 27 (Handbook on the Physics and Chemistry of Rare Earths). North Holland, 2000.