Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"Noble gases"”.
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Noble gases anomalies in terrestrial ores and meteorites
… in altering the is atopic ratios of individual noble gases and the total abundance pattern of these gases in carbonaceous chondrites"--Abstract,pages iii-v.</p>
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Noble gases: a record of the early solar system
"Analyses of the noble gases in samples of iron meteorites are presented which indicate the following: 1. The inclusions of iron meteorites contain noble gases with a wide range of isotopic compositions. 2. The noble gas concentration and isotopic anomalies arc often grossly inhomogeneously …
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Examination of natural background sources of radioactive noble gases with CTBT significance
… be beneficial in the development of future OSI noble gas monitoring techniques.
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Experimental examination of ionization processes of noble gases in strong laser fields
… of photons available, allows the ionization of noble gas atoms by absorption of a great number of IR-photons, whose individual energy is much smaller than the atom s ionization potential. Alternatively, the interaction may be described in terms of fields: The laser modifies the binding …
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Relation of electron scattering cross-sections to drift measurement in noble gases
We investigate the classic "inverse problem" of extracting collision and scattering cross sections from measurements of electron swarm behavior. A Monte Carlo technique for simulating electron motion through a gas of isotropic scatterers is presented, providing a simplified version of Biagi's …
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Deep inelastic neutron scattering and single particle kinetic energies in condensed noble gases
… solid and liquid neon and in several condensed noble gases by deep inelastic neutron scattering. The High Resolution Medium Energy Chopper Spectrometer at the Intense Pulsed Neutron Source at Argonne National Laboratory was used to measure the dynamic structure factor at values of the …
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Characterization of air-sea gas exchange processes and dissolved gas/ice interactions using noble gases
… the cycles of biogeochemically important gases such as 02 and C02, and thereby infer rates of biological activity in the upper ocean or the uptake of radiatively important "greenhouse" gases, the noble gases are used to characterize and quantify the physical processes affecting the …
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Landscape evolution and equilibrium in Southern Africa : insights from cosmogenic noble gases in Karoo dolerites and geospatial analyses
Southern Africa’s landscape is characterised by a high plateau (elevation > 1,000 m) bound by escarpments and extensional continental margins, and the region has been influential in the development of geomorphological theory. However, the evolution of this landscape in response to tectonic and …
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A determination of air-sea gas exchange and upper ocean biological production from five noble gases and tritiugenic helium-3
The five noble gases (helium, neon, argon, krypton, and xenon) are biologically and chemically inert, making them ideal oceanographic tracers. Additionally, the noble gases have a wide range of solubilities and molecular diffusivities, and thus respond differently to physical forcing. Tritium, an …
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The noble gas record of terrestrial and meteoritic samples
… of two neutrinos.</li> </ol> <p>A study of noble gases in Thailand tektites provided the following information on the history of these objects:</p> <ol> <li>The isotopic compositions of nonradiogenic Ne, Ar, Kr, and Xe are atmospheric.</li> <li>The abundance pattern of noble gases relative …
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A determination of air-sea gas exchange and upper ocean biological production from five noble gasses and tritiugenic helium-3
The five noble gases (helium, neon, argon, krypton, and xenon) are biologically and chemically inert, making them ideal oceanographic tracers. Additionally, the noble gases have a wide range of solubilities and molecular diffusivities, and thus respond differently to physical forcing. Tritium, an …
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Tracing fluid dynamics with noble gas and stable isotope systematics : examples from Krafla, Iceland and Sichuan Basin, China
The study of noble gases and reactive gases (i.e., CO2, N2 and CH4) in crustal reservoirs can help better understand the origin, migration and accumulation processes of crustal fluids in the subsurface environment, which provide further insights into fluid dynamics underground. This PhD thesis …
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Solar Wind Helium, Neon, And Argon In Genesis Aluminum Collectors
… ratios due to diffusive losses for the light noble gases. The results of this experiment show that the polished Al collector is not sufficiently retentive of the light noble gases to be a reliable collector for the light gases, but that the composition of the light gases implanted in the Al on …
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Geochemical signals of volcanic unrest at the Virkisjökull Glacier Iceland
… and sulphate alongside major chemistry and the noble gases. Analysis of oxygen deuterium data collected over four years revealed a hydrological system dominated by glacial meltwater and aquifer fed groundwater that varied both seasonally and spatially. Sulphate isotopes suggested that water …
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Dielectric liquid ionization chambers for detecting fast neutrons
… properties are similar to those of condensed noble gases, but they don't require cryogenic temperatures to maintain liquid phase. However, like condensed noble gases, they do require a high level of purity. A stainless steel purification system was constructed to purify the liquids and the …
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A Computational Investigation of the Photophysical, Electronic and Bonding Properties of Exciplex-Forming Van der Waals Systems
… Hg dimers, excimers and exciplexes formed with noble gases.
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Investigating the Distribution and Source(s) of Lunar Volatiles
… of between +87 ‰ and +160 ‰. <br></br><br></br> Noble gases in soils are dominated by solar wind components, with only minor amounts of cosmogenic neon being released at the highest temperature steps. In mare basalts, noble gases are a mixture of trapped, radiogenic, and cosmogenic components …
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Force Field Development With Gomc A Fast New Monte Carlo Molecular Simulation Code
… n-6 force fields include force fields for noble gases and branched alkanes. These force fields are shown to be the most accurate LJ or n-6 force fields to date for these compounds, capable of reproducing pure fluid behavior and binary mixture behavior to a high degree of accuracy.</p>
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