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Showing 1 to 20 of 29 for “"hydrogen isotopes"”.
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High energy scattering of helium by the molecular hydrogen isotopes
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1967
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Determination of sediment provenance at drift sites using hydrogen isotopes in lipids
… from the deposition site. We hypothesize that hydrogen isotope ratios of alkenones, a class of lipids from phytoplankton, may provide insight into the source of fine fraction sediment. Because of their restricted sources, broad geographic distribution, and excellent preservation properties, …
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Thermally-Induced Behavior of Liquid hydrogen Isotopes Inside Inertial Confinement Fusion Targets
Made available in DSpace on 2017-07-06T18:59:15Z (GMT). No. of bitstreams: 2 Varadarajan_V_MS.pdf: 49825925 bytes, checksum: 4f7150b2046f5da207949c6dec06c9c4 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1987
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Investigating recharge rates in Table Mountain springs using oxygen and hydrogen isotopes
This thesis investigates the monthly variation in hydrogen and oxygen isotope composition of four springs at the foot of Table Mountain, and by comparing this variation with that of local rainfall, estimates are made of their recharge rate. The oxygen, hydrogen, and EC data for Main spring, De Waal …
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Determination of sediment provenance at drift sites using hydrogen isotopes in lipids
… from the deposition site. We hypothesize that hydrogen isotope ratios of alkenones, a class of lipids from phytoplankton, may provide insight into the source of fine fraction sediment. Because of their restricted sources, broad geographic distribution, and excellent preservation properties, …
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Exchange of oxygen and hydrogen isotopes between water and water vapor: Experimental results
The exchange of {dollar}\delta\sp{18}{dollar}O, {dollar}\delta{dollar}D, and tritium between water and water vapor was quantified using two methods. The first was quiescent equilibration of water samples having widely contrasting isotopic compositions, surface areas, volumes and temperatures, but …
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Basic Study on Permeation and Inventory of Hydrogen Isotopes in Plasma-Facing Metals
本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである
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Temperature Effects on the Behavior of Liquid Hydrogen Isotopes Inside a Spherical-Shell Inertial Confinement Fusion Target
… effects on the formation of a uniform liquid hydrogen layer inside a spherical glass shell (SGS). The profile of the liquid layer is first investigated for an isothermal case. An equation suitable for describing the profile is derived by including the London-van der Waals attractive forces …
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A Numerical Model for Analyzing Thermal Layering of Liquid Mixtures of Hydrogen Isotopes Inside a Spherical Inertial Confinement Fusion Target
Made available in DSpace on 2017-07-06T18:56:24Z (GMT). No. of bitstreams: 3 Simpson_Elsie_M_MS.pdf: 76201261 bytes, checksum: 640e268234953d29f308a7dd1992f7e9 (MD5) Simpson_Elsie_M_MS_ABS.pdf: 602877 bytes, checksum: 43d4e8d20d26a20f23cd8cf6c25e57b2 (MD5) license.txt: 4813 bytes, checksum: …
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Study of the properties of hydrogen and deuterium in beta phase palladium hydride and deuteride
… in this field. The processing and refinement of hydrogen isotopes from mixed isotope sources is one such issue. Palladium already plays a part in existing infrastructure for this purpose. Existing work about the exact nature of the isotopic differences in the palladium hydride (/deuteride / …
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Computational studies of hydrogen in palladium
… of Monte-Carlo investigations on the Palladium Hydrogen system are presented.It is demonstrated that a simple long-range concentration-dependent attractiveforce reproduces the form of the pressure-composition isotherms well. Short rangepairwise repulsive forces reproduce much of the hydrogen …
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Stable Isotopes as Tracers for Freshwater Fluxes into the North Atlantic
… the quasi-conservative properties of oxygen and hydrogen isotopes in watermasses to identify and quantify the freshwater sources to the ocean currents exiting the Arctic into the northern North Atlantic.<br/><br/>Comparison of historical oxygen isotope data from the East Greenland Current system …
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A stable isotope stratigraphy for the Axel Heiberg Fossil Forest and its application to Eocene climate
… icehouse world. This study details carbon and hydrogen isotopic and biomarker analyses of samples of lignite (bulk fossil leaves), wood, paleosol, and resinite from the Middle to Late Eocene age fossil forest stratigraphy on Axel Heiberg Island, Nunavut, Canada. Bulk carbon isotopes show a …
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Application of Hydrogen and Oxygen Isotope Ratios of Water to the Study of Evaporation, Palaeoclimate, and Ancient Marine Conditions
Triple-oxygen and hydrogen isotopes of water are critical to aid our understanding of the hydrological cycle on the modern and ancient Earth. As such, this thesis presents advancements in techniques and in the understanding of the isotopic behaviour of water that undergoes evaporation in different …
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A comprehensive chemical examination of methylamphetamine produced from pseudoephedrine extracted from cold medication
… specific target impurities. Carbon, nitrogen and hydrogen stable isotope ratios facilitated the differentiation of samples by route, and precursor source with nitrogen and hydrogen isotopes providing the best results. Inorganic impurities present in the samples were analysed using inductively …
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Characterizing Variable Flow Pathways And Geochemical History Of Seepage Under The Mississippi River Levee: 2011, 2015, And 2016 Floods
… chemistry, trace metals, tritium, and stable isotopes of oxygen, hydrogen, and strontium, enhanced understanding of the nature of flow and the geochemical evolution of the local groundwater. Geochemical signatures identify distinct deep and shallow flow pathways. Deeper flow pathways have …
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The Fusion Enterprise Paradox: The Enduring Vision and Elusive Goal of Unlimited Clean Energy
… benign electricity from fusion of hydrogen isotopes has been a goal for six decades and consumed vast financial and intellectual resources in North America, Europe, and Asia. In terms of prolonged duration and sustained resource investment, the endeavor has developed into a huge …
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The History of Water and Other Associated Volatiles in Howardite-Eucrite-Diogenite Meteorites
… for their apatite H<sub>2</sub>O abundance and hydrogen isotopes, whilst seven eucrites (five of which were also investigated for H) were analysed for their apatite Cl content and isotopic composition. Apatite H<sub>2</sub>O abundances range from ~ 30 to ~ 3500 ppm and are associated with a …
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Hydrogen-water isotope exchange in a trickle bed column by process simulation and 3D computational fluid dynamics modelling
Hydrogen is the most abundant chemical element in the universe and exists under three isotopic forms: protium, deuterium and tritium. Protium is commonly used in a variety of industries including electronics, metallurgy, chemistry and petrochemistry. Deuterium and tritium have taken more roles in …
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Catalytic coatings for vanadium-based hydrogen membranes
… alternative to palladium as a dense metallic hydrogen membrane. However, catalytic surface coatings must be applied to vanadium surfaces to enable the transport of molecular hydrogen. These coatings facilitate dissociation and recombination kinetics of molecular hydrogen and protect vanadium …
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