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Дисертації з теми "Oxygen isotopes, atmospheric effects"

Автор: Grafiati

Опубліковано: 15 вересня 2021

Оновлено: 30 липня 2025

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1

Soens, Bastien. "Petrographic and geochemical characterization of the micrometeorite collection from the Sør Rondane Mountains: Nature and origin of the extraterrestrial flux to Earth." Doctoral thesis, Universite Libre de Bruxelles, 2021. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/331729.

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The Antarctic continent has traditionally been a successful searching ground for meteoritic material due to its cold and dry climate. Meteorites, and their microscopic analogues micrometeorites, were originally sampled from Antarctic ice and snow. Recently, however, a large collection of micrometeorites was discovered in sedimentary traps and moraine deposits from the Transantarctic Mountains, where extraterrestrial dust particles have accumulated for a prolonged time span (ca. 3–4 Ma). Micrometeorites (or ‘cosmic dust’) show unique chemical and isotopic signatures, which originate from a larg

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2

Missell, Christine Ann. "Thermoregulatory adaptations of Acrocanthosaurus atokensis - evidence from oxygen isotopes." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-12312003-115912/.

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Isotopic analyses of bone phosphate oxygen from a modern alligator, ostrich, and elephant have provided a means for examining diagenesis and thermoregulatory strategy within the dinosaur Acrocanthosaurus atokensis. The Acrocanthosaurus specimen is assumed to retain an original isotopic signature, based on a lack of linear correlation between δ18Ophosphate and structural δ18Ocarbonate, equal standard deviations between δ18Ophosphate values for spongy and compact bone, and a significant difference between δ18Ophosphate and cement δ18Ocarbonate. Interbone and intrabone temperature variation patte

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3

Warrington, 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.

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4

Dejwakh, Navid Rene. "Using 15N, 18O, and 17O to Determine Nitrate Sources and Removal Processes from Groundwater, Tucson, Arizona." Thesis, The University of Arizona, 2008. http://hdl.handle.net/10150/193327.

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Nitrate is a common groundwater contaminant. Due to adverse health effects, waters above the Maximum Contaminant Level (MCL) of 10 mg NO3-N/L or 0.71 mmols/L, are banned from domestic consumption by the EPA. Studies have measured elevated nitrate concentrations in arid land soils and groundwater around the world. These elevated concentrations could be detrimental to the environment and to human health. Thus, it is important to consider the different sources and processes affecting nitrate concentrations Here, a novel triple isotope system approach was employed, coupling Î´17O with Î´18O and Î´

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5

Webb, Mathew Douglas. "Carbon, chloride, and oxygen isotopes as tracers of interbasin groundwater flow at La Selva Biological Station, Costa Rica." NCSU, 2007. http://www.lib.ncsu.edu/theses/available/etd-03262007-111350/.

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Groundwater and surface water samples were taken at 14 locations at a lowland rainforest site (La Selva Biological Station) in Costa Rica for the analysis of DIC, DOC, 14C, 13C, 36Cl, 18O, and other geochemical parameters. The data are consistent with the mixing of two endmember groundwaters. One is a local water having low Cl concentrations (<0.07 mM), low DIC (<3.0 mM), high 14C (>100 pmc), δ13C between -22? and -26?, and highly variable 36Cl/Cl ratios. This chemistry is consistent with locally recharged shallow groundwaters having short residence times in which the DIC originates from plant

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6

Valdez, Adelia Christina. "Analysis of Atmospheric Effects Due to Atmospheric Oxygen on a Wideband Digital Signal in the 60 Ghz Band." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35234.

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As lower microwave frequency bands become saturated with users, there is a motivation for the research of applications that utilize higher frequencies, especially the 60 GHz band. This band is plagued with high atmospheric absorption due to atmospheric oxygen, but has a lot of bandwidth, which makes it desirable for multi-media applications. Recently, research of wideband digital links within the 60 GHz band gained the interest of the wireless communication industry when the FCC announced that a license is not required for a wideband digital signal in this band. Previous research on 60 GHz s

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7

Adiatma, Yoseph Datu. "Did early land plants produce a step-change in atmospheric oxygen centered on the Late Ordovician Sandbian Age ~458 Ma?" The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546386257035643.

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8

Mercer, A. P. "The effects of atmospheric humidity and oxygen on the wear of metals by fine abrasives." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356659.

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9

Wilson, Jessica Norman. "Stable Isotopes and Trace Elements in Tooth Enamel Bioapatite: Effects of Diagenesis and Pretreatment on Primary Paleoecological Information." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4965.

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The geochemical analysis of bioapatite in vertebrate skeletal tissues is an important tool used to obtain ecological information from fossil animals. An important consideration when conducting stable isotope and trace element analyses is obtaining biogenic information that has been unaffected by diagenetic processes. A two-step pretreatment procedure is commonly used remove diagenetically altered material by removing organic material, via an oxidation reaction with H2O2 or NaOCl, and secondary carbonate, via dissolution in dilute acetic acid, from bioapatite. While much work has been done to

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10

Howard, Evan M. (Evan Michael). "Ecosystem metabolism in salt marsh tidal creeks and ponds : applying triple oxygen isotopes and other gas tracers to novel environments." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/109021.

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Thesis: Ph. D., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2017.<br>Cataloged from PDF version of thesis. Page 216 blank.<br>Includes bibliographical references (pages 179-215).<br>Salt marshes are physically, chemically, and biologically dynamic environments found globally at temperate latitudes. Tidal creeks and marshtop ponds may expand at the expense of productive grass-covered marsh platform. It is therefore important to

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11

Hall, Veronica. "Addressing Water Resource Issues In Barbados Through An Isotopic and Atmospheric Characterization of Precipitation Variability." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1356.

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Numerous studies have analyzed isotopic variation of meteoric and dripwater in karst environments for paleoclimate reconstructions or aquifer recharge capacity. What is poorly understood is how the isotopic signal of δ18O and δ2H is transferred through the hydrologic cycle based upon storm type, frequency, intensity, and teleconnection activity in the tropical karst areas. At Harrison’s Cave, Barbados, a Hobo Onset event data logger was attached to a tipping bucket rain gauge to count the tips and record the total rainfall every 10 minutes. In the cave a Hobo data logger was used to record rel

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12

Morin, 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.

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Les oxydes d'azote atmosphériques (NOx=NO+NO2) sont des composés clefs en chimie de l'environnement, jouant un rôle central pour la capacité oxydante de l'atmosphère et le cycle de l'azote. La composition isotopique du nitrate atmosphérique (NO?3 particulaire et HNO3 gazeux), constituant leur puits ultime, renseigne sur leur bilan chimique. Le rapport 15N/14N donne une indication de leurs sources, alors que l'anomalie isotopique en oxygène (?17O=d17O-0.52×d18O) révèle la nature de leurs mécanismes d'oxydation. Des études couplées de d15N et ?17O d'échantillons de nitrate atmosphérique collecté

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13

Davis, John Christopher. "Understanding the origin of 35/37Cl and 16/18O isotope effects on 195Pt and 103Rh NMR nuclear shielding in selected Pt(IV) and Rh(III) complexes : a DFT study." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/95484.

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14

Amrhein, Daniel Edward. "Inferring ocean circulation during the last glacial maximum and last deglaciation using data and models." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107085.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2016.<br>Ph. D. Joint Program in Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2012<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 179-192).<br>Since the Last Glacial Maximum (LGM, ~ 20,000 years ago) air temperatures warmed, sea level rose roughly 130 meters, and atmospheric concentrations of carbon dioxide increased. This thesis co

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15

Pourkhesalian, Ali Mohammad. "Effects of biodiesel chemical composition on the chemical and physical properties of the primary and secondary diesel particulate matter." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/86757/14/86757_Ali_Mohammad_Pourkhesalian_Thesis.pdf.

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This thesis improves our insight towards the effects of using biodiesels on the particulate matter emission of diesel engines and contributes to our understanding of their potential adverse health effects. The novelty of this project is the use of biodiesel fuel with controlled chemical composition that enables us to relate changes of physiochemical properties of particles to specific properties of the biodiesel. For the first time, the possibility of a correlation of the volatility and the Reactive Oxygen Species concentration of the particles is investigated versus the saturation, oxygen con

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16

Leavitt, William Davie. "On the mechanisms of sulfur isotope fractionation during microbial sulfate reduction." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11511.

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Underlying all applications of sulfur isotope analyses is our understanding of isotope systematics. This dissertation tests some fundamental assumptions and assertions, drawn from equilibrium theory and a diverse body of empirical work on biochemical kinetics, as applied to the multiple sulfur isotope systematics of microbial sulfate reduction. I take a reductionist approach, both in the questions addressed and experimental approaches employed. This allows for a mechanistic, physically consistent interpretation of geological and biological sulfur isotope records. The goal of my work here i

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17

Pollack, Gerald D. "Timing and Characterization of the Change in the Redox State of Uranium in Precambrian Surface Environments: A Proxy for the Oxidation State of the Atmosphere." unrestricted, 2008. http://etd.gsu.edu/theses/available/etd-12052008-125923/.

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Thesis (Ph. D.)--Georgia State University, 2008.<br>Title from file title page. Eirik J. Krogstad, committee chair; Andrey Bekker, committee co-chair; W. Crawford Elliott, Timothy E. LaTour, committee members. Description based on contents viewed Aug. 27, 2009. Includes bibliographical references (p. 207-219).

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18

Vicars, William. "Transfert de l'anomalie isotopique portée par l'ozone dans la troposphère : vers une interprétation quantitative de la composition isotopique en oxygène du nitrate atmosphérique." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00856960.

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L'ozone (O3) possède une anomalie isotopique en oxygène qui est unique et caractéristique, offrant ainsi un précieux traceur des processus oxydatifs à l'œuvre dans l'atmosphère moderne mais aussi ceux ayant eu lieu dans le passé. Cette signature isotopique, dénotée Δ17O, se propage au sein du cycle atmosphérique de l'azote réactif (NOx = NO + NO2) et est préservée lors du dépôt du nitrate (NO3-) présent dans l'aérosol, par exemple. L'anomalie isotopique en oxygène portée par le nitrate, Δ17O(NO3-), représente ainsi un traceur de l'importance relative de l'ozone ainsi que celle d'autres oxydant

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19

Köhler, Iris [Verfasser], Johannes [Akademischer Betreuer] Schnyder, Margaret [Akademischer Betreuer] Barbour, and Rainer [Akademischer Betreuer] Matyssek. "The interactive effects of rising atmospheric CO2 and nutrient supply on carbon and water relations in grassland ecosystems : an analysis of stable carbon isotopes and water-use efficiency in vegetation samples from the Park Grass Experiment / Iris Köhler. Gutachter: Margaret Barbour ; Rainer Matyssek ; Johannes Schnyder. Betreuer: Johannes Schnyder." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1033403032/34.

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20

Brandon, Margaux. "Les changements majeurs de la productivité biologique au cours du Quaternaire et leurs impacts sur les cycles du carbone et de l’oxygène." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASJ010.

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A l’échelle des cycles glaciaires-interglaciaires (G/IG) du Quaternaire, la concentration atmosphérique en CO₂ (p CO₂) est associée à d’importantes variations, notamment pendant les transitions entre périodes glaciaires et interglaciaires, aussi appelées terminaisons, qui enregistrent des augmentations de pCO₂ de l’ordre de 100 ppm en quelques milliers d’années. Alors que les rôles de la circulation océanique et de l’étendue de la couverture de glace sur le pCO₂ sont étudiés depuis plusieurs années, peu de travaux s’intéressent à l’impact de la productivité biologique. L’objectif de cette thès

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21

"Oxygen isotope effects in La0.67Ca0.33MnO3 thin films." 2005. http://library.cuhk.edu.hk/record=b5892665.

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Li Chak Ming = 18O氧同位素效應對La0.67Ca0.33MnO3薄膜之影響 / 李澤銘.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2005.<br>Includes bibliographical references.<br>Text in English; abstracts in English and Chinese.<br>Li Chak Ming = 18O yang tong wei su xiao ying dui La0.67Ca0.33MnO3 bo mo zhi ying xiang / Li Zeming.<br>Acknowledgement --- p.i<br>Abstract --- p.ii<br>論文摘要 --- p.iii<br>Table of Contents --- p.iv<br>List of Figures --- p.viii<br>List of Tables --- p.xi<br>Chapter Chapter 1 --- Introduction<br>Chapter 1.1 --- Magnetoresistance (MR) 1 - --- p.1<br>Chapter 1.1.1 --- Magnetoresist

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22

St, Amour Natalie Ann. "A Multi-Proxy Study of Holocene Atmospheric Circulation Dynamics Recorded in Lake Sediments in Fennoscandia." Thesis, 2009. http://hdl.handle.net/10012/4225.

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Cellulose-inferred lake water oxygen-isotope records were obtained from five throughflow lakes situated along a north-south transect across Fennoscandia to help develop a better picture of Holocene changes in atmospheric circulation in the region. This research addresses prior evidence for the existence of non-temperature-dependent shifts in d18O of precipitation in the early Holocene attributed to changes in atmospheric circulation. The validity of this hypothesis is tested through the development of oxygen-isotope records from lake sediments and their interpretation in the context of inde

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23

Scicchitano, Maria Rosa. "Oxygen isotopes as tracers and stopwatches for rock-fluid interaction in the crust: New analytical and experimental developments." Phd thesis, 2018. http://hdl.handle.net/1885/144939.

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Metamorphism is the dominant transformation mechanism of rocks in most of the Earth’s lithosphere and it is driven by variations in temperature, pressure, deformation and influx of chemically active fluids. Fluids play a crucial role in affecting many physical and chemical processes. It is therefore essential to unravel their nature and source(s) and the extent of their infiltration to fully understand crustal evolution. Oxygen isotopes are one of the most robust tools used to obtain such information. Because fluid-rock interactions can occur at different stages of metamorphism, metamorphic ro

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24

Jasechko, Scott. "Stable isotope mass balance of the North American Laurentian Great Lakes." Thesis, 2011. http://hdl.handle.net/10012/6302.

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This thesis describes a method for calculating lake evaporation as a proportion of water inputs (E/I) for large surface water bodies, using stable isotope ratios of oxygen (18O/16O) and hydrogen (2H/1H) in water. Evaporation as a proportion of inflow (E/I) is calculated for each Laurentian Great Lake using a new dataset of 516 analyses of δ18O and δ2H in waters sampled from 75 offshore stations during spring and summer of 2007. This work builds on previous approaches by accounting for lake effects on the overlying atmosphere and assuming conservation of both mass and isotopes (18O and 2H) to b

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25

LIN, CHIA-YU, and 林家宇. "Effects of oxygen concentrations on the antibacterial efficiency of AgOx and TaOxNy-Ag thin films as well as TaN-Ag thin films treated by atmospheric pressure plasma jet." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/e8584x.

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碩士<br>明志科技大學<br>材料工程系碩士班<br>105<br>AgxO thin films were deposited by reactive co-sputtering with various oxygen flow rates.The films' structural and mechanical properties were examined. Then, the samples were tested for their antibacterial behaviors against Escherichia coli. It was first found that the dissolution of Ag ion was varied depending on oxygen contents. The Ag ion concentration would reach a maximum value with the increase of oxygen contents, then level off. The antibacterial efficiency of TaOxNy-Ag films against Escherichia coli could be much improved, comparing with that of TaN-Ag

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