Дисертації з теми "Oxyen isotopes"
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Vaiglova, Petra. "Neolithic agricultural management in the Eastern Mediterranean : new insight from a multi-isotope approach." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:c8824136-da35-43b2-a700-f458d0cc2fdf.
Повний текст джерелаGrefe, Imke. "Concentration and isotopic composition of marine nitrous oxide, in particular the oxygen-17 isotope excess." Thesis, University of East Anglia, 2013. https://ueaeprints.uea.ac.uk/48791/.
Повний текст джерелаBuchwald, Carolyn. "Oxygen isotope systematics of nitrification." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/114328.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 39-41).
During nitrification there is an exchange of oxygen atoms between water and nitrite, causing the [delta]¹⁸O of nitrate produced by nitrification to be closer to the [delta]¹⁸O of water than expected. A series of lab and field experiments were set up in order to quantify the exchange, and then calculate the [delta]¹⁸O of nitrate with these values. The lab experiments tested the exchange in ammonia oxidation, using ammonia oxidizing bacteria, Nitrosomonas sp. C113a and Nitrococcus oceani, and nitrite oxidation using cultures of the nitrite oxidizing bacterium, Nitrosococcus mobilis. The exchange value in the ammonia oxidation experiments could not be calculated because of unexpected complications in the analysis in the [delta]¹⁸O of nitrite. Although we weren't able to obtain a confident value for the exchange we were able to find a way to correct the [delta]¹⁸O of nitrite, for blank and exchange that affects the sample [delta]¹⁸O value for nitrite measured by the mass spectrometer. The exchange in the nitrite oxidation experiment could not be measured because there was full abiotic exchange in the bottle preventing us from calculating biotic exchange. A control experiment was successful in eliminating this exchange by adjusting the pH to a value higher than 8 prior to inoculation of the media during the experiment. In a future nitrite oxidation experiment this change in experimental design would make it possible to measure the exchange during nitrite oxidation. The experiments were a good step toward developing the best way to measure microbially-catalyzed exchange, and hopefully this value can be quantified in future analysis.
by Carolyn Buchwald.
S.B.
趙雪蓮 and Suet-lin Shirley Chiu. "Predissociation line width of the Schumann-Runge bands of oxygen and its isotopes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1990. http://hub.hku.hk/bib/B31209658.
Повний текст джерелаRitz, P. "An appraisal of the doubly labelled water method for energy expenditure measurements." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319821.
Повний текст джерелаMissell, Christine Ann. "Thermoregulatory adaptations of Acrocanthosaurus atokensis - evidence from oxygen isotopes." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-12312003-115912/.
Повний текст джерелаAl-Qattan, Nasser M. E. N. A. A. "Interpretation of Oxygen Isotopic Values (d18O) of North American Land Snails." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1404460805.
Повний текст джерелаChiu, Suet-lin Shirley. "Predissociation line width of the Schumann-Runge bands of oxygen and its isotopes /." [Hong Kong] : University of Hong Kong, 1990. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12920575.
Повний текст джерелаRebenack, Carrie E. "A Carbon and Oxygen Stable Isotope-Dendrochronology Study of Trees from South Florida: Implications for the Development of a High-Resolution Subtropical Paleoclimate Record." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3009.
Повний текст джерелаBaraut, Lambert. "Etudes expérimentales des fractionnements isotopiques indépendants de la masse dans la réaction de formation de l'ozone en phase plasma." Thesis, Paris, Muséum national d'histoire naturelle, 2019. http://www.theses.fr/2019MNHN0002.
Повний текст джерелаThe Earth's atmosphere has undergone, during its early history, very violent changes in its chemical composition. The emergence of the first photosynthetic living beings has led to the establishment and modification of major biogeochemical cycles. The use of isotopes as tracers of active physico-chemical processes during these periods has been developed since the 1980s. The observation of abnormal isotopic compositions in certain atmospheric molecules (ozone in particular), similar to those observed in meteorites by Clayton (1973), raises questions. Many hypotheses have been proposed to explain this "abnormal" phenomenon. The main objective of this doctoral work is to develop, through experimentation, the study of plasma reactions from an isotopic point of view. In particular, ozone formation third-body reactions, where the formation of an excited intermediate complex is involved in the mechanisms of generating these abnormal isotopic fractionations, will be studied
Seligman, Angela. "Oxygen and hydrogen investigation of volcanic rocks: Petrogenesis to paleoclimate." Thesis, University of Oregon, 2016. http://hdl.handle.net/1794/20547.
Повний текст джерелаLee, Vanessa Eileen. "Characterising dissolved nitrate in precipitation using stable nitrogen and oxygen isotopes /." Internet access available to MUN users only, 2005. http://collections.mun.ca/u?/theses,18576.
Повний текст джерелаMotz, John Edward. "Oxygen and hydrogen isotopes in fossil insect chitin as paleoenvironmental indicators." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ51214.pdf.
Повний текст джерелаWellman, Toby. "Carbon and oxygen stable isotopes from recent and fossil Australian crustaceans /." Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09SB/09sbw4528.pdf.
Повний текст джерелаWhite, Rowan May Patricia. "Isotope systematics of the freshwater mollusca Lymnaea peregra." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266733.
Повний текст джерелаLeavitt, William Davie. "On the mechanisms of sulfur isotope fractionation during microbial sulfate reduction." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11511.
Повний текст джерелаEarth and Planetary Sciences
Mellor, Ian. "Isotopic oxygen exchange reactions on magnesium oxide." Thesis, Nottingham Trent University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298901.
Повний текст джерелаCliff, Steven Scott. "Oxygen isotopic studies of atmospheric nitrous oxide /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9906467.
Повний текст джерелаBates, Steven Matthew. "Conodont oxygen isotope records of late carboniferous paleoenvironmental variability /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1426047.
Повний текст джерелаWinters, Tim. "Oxygen isotope ratios in seawater of the North Atlantic." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323347.
Повний текст джерелаGloel, Johanna. "Triple oxygen isotopes and oxygen/argon ratio measurements to enhance coastal and open ocean production/respiration comparisons." Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/42341/.
Повний текст джерелаMorin, Samuel. "Analyse de la composition isotopique de l'ion nitrate dans la basse atmosphère polaire et marine." Phd thesis, Université Paris-Est, 2008. http://tel.archives-ouvertes.fr/tel-00326229.
Повний текст джерелаMcCabe, Justin R. "Investigations of the oxidation capacities of polar atmospheres with multiple oxygen isotopes /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3244178.
Повний текст джерелаRyabenko, Evgenia [Verfasser]. "Nitrogen Isotopes in the Atlantic and Pacific Oxygen Minimum Zones / Evgenia Ryabenko." Kiel : Universitätsbibliothek Kiel, 2017. http://d-nb.info/1138992550/34.
Повний текст джерелаWarrington, Anita Glasgow. "Stable isotopes of carbon and oxygen in the shells of terrestrial molluscs." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316976.
Повний текст джерелаHarwood, Kirsty. "Variation in the stable isotopes of oxygen and carbon within forest canopies." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360330.
Повний текст джерелаHalenyane, Keolebogile. "Investigating recharge rates in Table Mountain springs using oxygen and hydrogen isotopes." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/27834.
Повний текст джерелаWinhusen, Eric. "PRECAMBRIAN SEAWATER TEMPERATURE ANALYSIS USING OXYGEN ISOTOPES FROM HAMERSLEY CARBONATES, WESTERN AUSTRALIA." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin992268720.
Повний текст джерелаKim, Sang-Tae 1970. "Oxygen isotope systematics in carbonate-water systems : influence of temperature, solution chemistry, and kinetic isotope fractionation." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111838.
Повний текст джерелаBased upon the above oxygen isotope fractionation and the oxygen isotope systematics of aragonite and witherite obtained from various precipitation experiments, it was discovered that CO32- rather than the more abundant HCO3- ions are preferentially incorporated into the growing carbonate crystal. Furthermore, it was proposed that the faster deprotonation kinetics of isotopically light HCO 3- ions and the preferential incorporation of light CO3 2- isotopologues could account for the kinetic isotope effects observed in these carbonate minerals.
Aragonite was inorganically precipitated from Na-Ca-Mg-Cl-HCO3 solutions at 0, 5, 10, 25, and 40°C to determine the temperature dependence of the equilibrium oxygen isotope fractionation between this mineral and the parental solution. To establish a reliable relationship between temperature and oxygen isotope fractionation as well as discount potential experimental artifacts, three different precipitation protocols were employed but statistically identical results were obtained under the conditions investigated. In addition, the extent of kinetic isotope effects induced by variations of the precipitation rate, pH, and Mg2+ concentration of the parent solutions, were thoroughly tested to establish that equilibrium oxygen isotope fractionation occurs.
In order to obtain accurate oxygen isotope compositions of the aragonite precipitates by the conventional phosphoric acid dissolution method, a statistically reliable acid fractionation factor for aragonite (and calcite) was also determined from pure natural aragonite (and calcite) specimens. From a large number (i.e., 29 and 60 individual analyses for aragonite and calcite, respectively) of replicate total oxygen isotope analyses and the isotopic composition of the acid-liberated CO2 between 25 to 75°C, the following two new equations are proposed: 1000lnaCO2&parl0;ACID &parr0;-Calcite=3.59&parl0; 103/T&parr0;-1.79 1000lnaCO2&parl0;ACID &parr0;-Aragonite=3.39&parl0; 103/T&parr0;-0.83
By combining the new acid fractionation factor of 1.01063 for aragonite at 25°C with the oxygen isotope data from the synthesis experiments determined in this study, a new relationship is reported for the temperature dependence of the aragonite-water oxygen isotope fractionation over the temperate range of 0-40°C: 1000lnaaragonite-water=17. 88+/-0.13&parl0;103/T&parr0; -31.14+/-0.46
This new experimental calibration of the aragonite-water fractionation yields a positive aragonite-calcite oxygen isotope fractionation over the temperature range investigated, in agreement with theoretical calculations. This result also provides a baseline to quantify vital or kinetic effects that are frequently observed in natural abiogenic or biogenic aragonite minerals.
Gentry, David Keith. "Seasonal isotope and trace-metal profiles of serially-sampled Conus gastropods: proxies for paleoenvironmental change." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/3871.
Повний текст джерелаMoerman, Jessica. "Regional hydrology captured in northern Borneo rainwater and dripwater isotope variability." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53523.
Повний текст джерелаNasdala, Lutz, Fernando Corfu, John W. Valley, Michael J. Spicuzza, Fu-Yuan Wu, Qiu-Li Li, Yue-Heng Yang, et al. "Zircon M127 - A Homogeneous Reference Material for SIMS U-Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis." WILEY-BLACKWELL, 2016. http://hdl.handle.net/10150/621937.
Повний текст джерелаFeng, Xiahong. "Oxygen isotope studies of zeolites: Stilbite, analcime, heulandite and clinoptilolite." Case Western Reserve University School of Graduate Studies / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1059573322.
Повний текст джерелаBaker, Evan. "Carbon and Oxygen Isotope Fractionation in Laboratory-Precipitated, Inorganic Calcite." Thesis, University of Oregon, 2015. http://hdl.handle.net/1794/19311.
Повний текст джерелаMotimele, Kanting Evidence. "A relativistic analysis of proton-induced knockout reactions from oxygen isotopes with direct and inverse kinematics." University of the Western Cape, 2020. http://hdl.handle.net/11394/8187.
Повний текст джерелаIn this study a complete set of exclusive (~p; 2p) polarization transfer observables of closed-shell oxygen isotopes are calculated using both direct and inverse kinematics using the relativistic plane wave impulse approximation. The interaction matrix is written in terms of the SPVAT (scalar, pseudoscalar, vector axial vector, tensor) covariants where each amplitude is obtained directly from experimental phase shifts. A relativistic mean eld theory approximation is used to compute boundstate wave functions of the nucleons. We study the evolution of polarization transfer observables within oxygen isotopes and identify observables which may discriminate between these isotopes. The same kinematical conditions are considered for both direct and inverse kinematics: the incident energy is set at 504 MeV and coplanar angles are xed at (22:12 ;40:30 ). The results indicate that only three spin observables, namely, Ay, P and Dnn distinguish di erent oxygen isotopes at these kinematical conditions in the inverse kinematics.
Galeazzo, Tommaso. "Tracking volcanic sulphate : modelling tropospheric volcanic sulphate formation and its oxygen isotopic signatures." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS300.
Повний текст джерелаVolcanic emissions are a major source of sulphur. Volcanic sulphur is oxidized and forms sulphate aerosols that influence the climate by absorbing and dispersing incident solar radiation. Sulphur emissions in the troposphere influence local and regional climate, but large uncertainties remain regarding oxidation and its conversion into volcanic sulphate aerosols. The oxidation of sulphur in a wide range of volcanic plumes and the influence of volcanic halogens on plume chemistry are studied using a chemical box model. At the same time, the isotopic oxygen composition of volcanic sulphate, namely the excess of 17-O (∆17O), is being explored, which can provide constraints on sulphur oxidation pathways. The results suggest that in the presence of water droplets and ash, the oxidation of sulphur in plumes is mainly due to aqueous phase oxidation with O2 catalyzed by transition metal ions (TMI). Halogen emissions promote the domi- nance of O2 /TMI by inducing ozone depletion events (ODEs). In the absence of water droplets, plume chemistry is largely determined by heterogeneous chemistry on primary sulphate aerosols. The dominant oxidants in these plumes are OH and H2O2. The oxidation rate of sulphur is significantly reduced compared to plumes containing water droplets. The results show that oxygen isotopes in sulphates provide strong constraints on the chemical balance of sulphur in volcanic plumes and on the role of volcanic halogens
Remmelzwaal, Serginio. "Assessing past oxygen in the ocean using Cr isotopes as a palaeo-proxy." Thesis, University of Bristol, 2018. http://hdl.handle.net/1983/d38b75bf-f8bb-4671-bcbb-f3d71629b900.
Повний текст джерелаJuranek, Lauren Wray. "Assessment of Pacific Ocean carbon production and export using measurements of dissolved oxygen isotopes and oxygen/argon gas ratios /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/11055.
Повний текст джерелаTowers, Jacqueline R. "An isotopic investigation into calving seasonality, diet and dairying in British Prehistoric cattle. Reconstructing animal husbandry at a sub-annual resolution using multi-isotope analysis and intra-tooth sampling." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/7352.
Повний текст джерелаRowell, Kirsten. "Isotopic Logs of The Sea of Cortez: Oxygen and Carbon Stable Isotopes in Otoliths of Marine Fish Record the Impact of Diverting the Colorado River from the Sea." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/194512.
Повний текст джерелаLaukert, Georgi [Verfasser]. "Ocean circulation and shelf processes in the Arctic Mediterranean traced by radiogenic neodymium isotopes, rare earth elements and stable oxygen isotopes / Georgi Laukert." Kiel : Universitätsbibliothek Kiel, 2017. http://d-nb.info/1128149257/34.
Повний текст джерелаTowers, Jacqueline Ruth. "An isotopic investigation into calving seasonality, diet and dairying in British prehistoric cattle : reconstructing animal husbandry at a sub-annual resolution using multi-isotope analysis and intra-tooth sampling." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/7352.
Повний текст джерелаFiebig, Jens. "Oxygen isotope microanalysis of silicates with application to fluid rock interfaces." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=963754106.
Повний текст джерелаWeis, Franz. "Oxygen Isotope Signatures of the Apatite-Iron Oxide Ore at Grängesberg." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-173031.
Повний текст джерелаOliveira, Carlos. "Exploring the physiological variables of oxygen isotope composition in chondrychthyan teeth." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-395647.
Повний текст джерелаSeguro, Requejo Maria Isabel. "Shelf-sea gross and net production estimates from triple oxygen isotopes and oxygen-argon ratios in relation with phytoplankton physiology." Thesis, University of East Anglia, 2017. https://ueaeprints.uea.ac.uk/69374/.
Повний текст джерелаWoodley, Ewan James. "Reconstructing the climate of Scotland using stable carbon and oxygen isotopes in tree-rings." Thesis, Swansea University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678326.
Повний текст джерелаStephenson, Richard Javier. "Tropical land snails as precipitation proxies: Oxygen stable isotopes of shells from Trinidad Island." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563273765452653.
Повний текст джерелаDuffy, Margaret R. "Determining the biological turnover rate of phosphate in agricultural soils using stable oxygen isotopes." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1593864445251739.
Повний текст джерелаBrooks-English, Nathanael Talman. "Stable Isotopes in the Spines of Columnar Cactus: a New Proxy for Climate and Ecophysiological Research." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195268.
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