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Rozprawy doktorskie na temat „Hydrogen isotopic composition”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

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1

ZNEIMER, STEPHANIA. "Stable isotopic composition of southern Illinois precipitation from (2012-2017) summary." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2578.

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This study examines variability in the isotopic composition of precipitation in southern Illinois, USA using a 5-year, event-based record, novel in its duration and in potential to extract important isotopic information of precipitation in a dynamic region, and the seasonality of major moisture sources. The isotopic composition of precipitation exhibited seasonal variations in δ18O and δ2H, where values are distinctively higher (lower) during summer (winter). Average values for d-excess were the highest (lowest) during autumn (summer). Seasonality is also present in events originating from the

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Leshin, Laurie Ann Stolper Edward M. Stolper Edward M. "The abundance and hydrogen isotopic composition of water in SNC meteorites : implications for water on Mars /." Diss., Pasadena, Calif. : California Institute of Technology, 1995. http://resolver.caltech.edu/CaltechETD:etd-11062007-091745.

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Snover, Amy Katherine. "The stable hydrogen isotopic composition of methane emitted from biomass burning and removed by oxic soils : application to the atmospheric methane budget /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/11570.

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Burke, Roger Allen Jr. "Stable Hydrogen and Carbon Isotopic Compositions of Biogenic Methanes." Scholar Commons, 1985. https://scholarcommons.usf.edu/etd/7658.

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Stable hydrogen and carbon isotopic compositions of biogenic methanes collected from the sediments of several deep-sea, nearshore marine-estuarine, and freshwater environments were determined. The isotopic compositions of methane samples from eight different DSDP Sites (mean σD-CH4 = -1850>/∞, std. dev. = 70>/∞, n = 75; mean σ13C-CH4 = -71.30/∞, std. dev. = 6.30/∞, n = 44) are generally typical of methane formed via C02 reduction in deep-sea sediments. Methane collected from several freshwater environments was D-depleted (mean σD-CH4 = -3000>/∞ , std. dev. = 260/∞, n = 20) and 13C-enriched (me

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5

Clog, Matthieu. "Concentration et composition isotopique en hydrogène du manteau terrestre." Paris 7, 2010. http://www.theses.fr/2010PA077209.

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Contraindre la concentration et la composition isotopique de l'hydrogène dans le manteau terrestre apporte des informations cruciales sur le cycle global de l'eau et la nature des hétérogénéités mantelliques. Dans ce but, les bordures vitreuses des basaltes sont les échantillons les plus adaptés Lors de cette étude, 170 échantillons provenant de 4 rides océaniques et 2 points chauds ont été analysés pour leurs concentrations en eau et leur δ D. Au cours de ce travail, un biais analytique lié à l'utilisation de creusets en platine pour extraire le éléments volatils a été mis en évidence. L'util

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Bates, Benjamin R. "Within Lake Spatial Variability of Long-chain n-alkanes and their Hydrogen Isotopic Compositions Adirondack Mountains, NY." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535373859284956.

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7

Dawson, Daniel. "Stable hydrogen isotope ratios of individual hydrocarbons in sediments and petroleum." Thesis, Curtin University, 2006. http://hdl.handle.net/20.500.11937/1237.

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Early research into the stable hydrogen isotopic compositions (δD) of petroleum involved bulk deuterium/hydrogen (D/H) measurements which, while providing some useful information, had to contend with the analysis of complex mixtures of hydrocarbons, and alteration resulting from the rapid exchange of nitrogen-, oxygen- and sulphur-bound hydrogen. The use of gas chromatography-isotope ratio mass spectrometry (GC-irMS) overcomes these problems by allowing the analysis of individual compounds containing only the most isotopically conservative aliphatic carbon-bound (C-bound) hydrogen. This projec

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8

Dawson, Daniel. "Stable hydrogen isotope ratios of individual hydrocarbons in sediments and petroleum." Curtin University of Technology, Department of Applied Chemistry, 2006. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16839.

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Early research into the stable hydrogen isotopic compositions (δD) of petroleum involved bulk deuterium/hydrogen (D/H) measurements which, while providing some useful information, had to contend with the analysis of complex mixtures of hydrocarbons, and alteration resulting from the rapid exchange of nitrogen-, oxygen- and sulphur-bound hydrogen. The use of gas chromatography-isotope ratio mass spectrometry (GC-irMS) overcomes these problems by allowing the analysis of individual compounds containing only the most isotopically conservative aliphatic carbon-bound (C-bound) hydrogen. This projec

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9

Newberry, Sarah. "Molecular distributions and hydrogen isotopic compositions of n-alkanes from field studies of tree species : applications for paleoclimate studies." Thesis, University of East Anglia, 2013. https://ueaeprints.uea.ac.uk/49706/.

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The compound-specific δD values and molecular distributions of n-alkanes preserved in sediment archives are used as paleoclimate proxies. This use is based on two assumptions, 1) n-alkane δD values are highly correlated with source water δD values (Sachse 2012), and 2) the δD values of n-alkanes within a single site show little variation (Hou 2007). n-alkane molecular distributions are also used to infer the dominant source of n-alkanes input into sediment archives (Seki 2010). Despite this, paleoclimate reconstructions are being made without full understanding of how the δD values of nalkanes

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10

Jappy, Trevor George. "Compositional dependence of potassium-argon ages and hydrogen and oxygen stable isotopes in hornblendes from Connemara, Western Ireland." Thesis, University of Glasgow, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264263.

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Hamilton, Bryan T. "Small Mammals in portions of Great Basin National Park Susceptible to Groundwater Withdrawal: Diversity and Stable Isotope Perspectives." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1705.

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To support population growth in Las Vegas, Nevada, large scale increases in groundwater pumping are planned across the state. This pumping could affect riparian areas in Great Basin National Park by lowering groundwater levels, reducing stream flows, and xerifying riparian vegetation. Great Basin National Park (GBNP) is mandated to manage its resources unimpaired for future generations. Loss of biodiversity is unacceptable under this mandate. If groundwater levels are reduced beyond a threshold, aquatic and riparian diversity would be lost, but the effects on small mammal communities are less

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12

Defouilloy, Céline. "Le rapport isotopique de l'hydrogène dans les météorites de fer." Paris, Muséum national d'histoire naturelle, 2012. http://www.theses.fr/2012MNHN0009.

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Les météorites de Fer sont généralement considérées comme étant des débris des noyaux de planétésimaux différenciés. Il existe pourtant des incertitudes concernant la formation de ces météorites de Fer. Un des outils que l’on peut utiliser afin de confirmer ou d’infirmer différentes hypothèses est le rapport isotopique de l’Hydrogène. En effet, le rapport isotopique de l’Hydrogène est très différent selon l’espèce porteuse de cet Hydrogène et selon les processus subis par le corps parent. Le rapport isotopique et les concentrations en Hydrogène ont été mesurés dans plusieurs météorites de Fer

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13

Aboglila, Salem Abdulghni-O. "Organic and isotopic geochemistry of source-rocks and crude oils from the East Sirte Basin (Libya)." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/2118.

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The Sirte Basin is a major oil producing area in Libya, but the understanding of the processes that have led to the petroleum accumulation is still limited. Exploration studies of this area have shown that the oils are mixtures of several charges and may be from different source rocks. The main aims of this thesis are to improve our understanding of the petroleum accumulation history in the East Sirte Basin.Biomarker ratios, together with stable carbon (δ[superscript]1[superscript]3C) and hydrogen (δD) isotopic compositions of individual hydrocarbons have been applied to 24 crude oils from the

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14

Mischler, John A. Alley Richard B. Sowers Todd A. "Carbon and hydrogen isotopic composition of methane over the last 1000 years." 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3646/index.html.

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Leshin, Laurie Ann. "The abundance and hydrogen isotopic composition of water in SNC meteorites : implications for water on Mars." Thesis, 1995. https://thesis.library.caltech.edu/4424/1/Leshin_la_1995.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The water in the current martian atmosphere contains [...] 5 times more deuterium (D) than water on Earth (corresponding to a [...] value of [...] +4000) resulting from preferential loss of hydrogen relative to deuterium from the martian atmosphere. This thesis places constraints on the D/H of other martian water reservoirs by measuring the D/H of water in hydrous phases within the SNC meteorites, thought to be samples of martian igneous rocks. Results from vacuum extraction

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16

Kaushal, Ritika. "Stable Isotopic Composition of Rice Grain Organic Matter as an Archive of Monsoonal Climate." Thesis, 2015. http://etd.iisc.ernet.in/2005/3995.

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Rice grows in saturated soil water condition and its requirement for water is highest amongst other cereal crops. In India, the southwest monsoon wind regime brings rainfall that provides a favourable environment for rice cultivation. Thus, there is significant dependency ofrice production on the southwest monsoon rainfall. Being a crop that grows across diverse climatic regions in India ranging from the humid to semi-arid, it offers possibility to explore therelationship between stable isotopic compositions in the grain organic matter with the climaticfactors relevant for its growth. In this

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Kaushal, Ritika. "Stable Isotopic Composition of Rice Grain Organic Matter as an Archive of Monsoonal Climate." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4019.

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Rice grows in saturated soil water condition and its requirement for water is highest amongst other cereal crops. In India, the southwest monsoon wind regime brings rainfall that provides a favourable environment for rice cultivation. Thus, there is significant dependency ofrice production on the southwest monsoon rainfall. Being a crop that grows across diverse climatic regions in India ranging from the humid to semi-arid, it offers possibility to explore therelationship between stable isotopic compositions in the grain organic matter with the climaticfactors relevant for its growth. In this

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Kaushal, Ritika. "Stable Isotopic Composition of Rice Grain Organic Matter as an Archive of Monsoonal Climate." Thesis, 2017. http://etd.iisc.ernet.in/2005/3996.

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Rice grows in saturated soil water condition and its requirement for water is highest amongst other cereal crops. In India, the southwest monsoon wind regime brings rainfall that provides a favourable environment for rice cultivation. Thus, there is significant dependency ofrice production on the southwest monsoon rainfall. Being a crop that grows across diverse climatic regions in India ranging from the humid to semi-arid, it offers possibility to explore therelationship between stable isotopic compositions in the grain organic matter with the climaticfactors relevant for its growth. In this

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19

Niedermeyer, Eva Maria [Verfasser]. "Northwest African Sahel climate variations during holocene, late pleistocene : insights from plant wax stable hydrogen (δD) and carbon (δ13C) isotopic composition and sea-surface temperature / Eva Maria Niedermeyer". 2009. http://d-nb.info/999446169/34.

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20

Dar, Shaakir Shabir. "On the spatio-temporal distribution of stable isotope ratios in the hydrological cycle over India and the Southern Ocean." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4353.

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The isotopic composition of water vapor and precipitation at continental and oceanic sites depends on factors such as: the geographical location of the sampling site, meteorological conditions at the moisture source areas, local meteorological conditions, rainout history of air-masses along their trajectory, large-scale moisture recycling below cloud evaporation, etc. The present study aims at identification and quantification of such processes over the Indian subcontinent and the Southern Ocean based on observed stable isotopic composition in precipitation and atmospheric moisture. The

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21

Zhou, Youping. "Carbon, oxygen and hydrogen isotope compositions of plant material : insights from controlled growth experiments and modelling." Phd thesis, 2005. http://hdl.handle.net/1885/150224.

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Chuang, Kai-Hsun, and 莊凱勳. "Hydrogen, Oxygen, and Carbon Isotope Compositions of Meteoric Waters in Feitsui Reservoir and Its Watershed, in Northern Taiwan." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/e9qqfe.

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碩士<br>國立中央大學<br>水文所<br>94<br>Feitsui Reservoir provides water supply in Taipei City as well as parts of Taipei County in northern Taiwan. The variations of hydrogen, oxygen, and carbon isotope compositions of waters record the sources and mixtures of waters; they are ideal and important tools to study hydrology. This study discussed the relationships among the waters in Feitsui Reservoir, rain waters and river in its watershed in order to provide basic isotope information in hydrology for the appropriate water resource management. From April 2003 to April 2004, rain waters of respective rainy

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