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.
Results
Showing 1 to 11 of 11 for “"H2O-CO2"”.
-
Experimental study of the effect of H2O-CO2-NaCl fluid immiscibility on the reaction calcite + quartz + rutile = sphene + CO2 at 2 KBAR
The minimum T-XCO₂ location of the reaction boundary calcite + quartz + rutile = sphene + CO₂ has been experimentally determined in H₂0-CO₂-NaCl fluids at 2 kbar. Extent and direction of reaction were monitored by the CO₂ weight change method using natural materials. All bulk compositions contain …
-
The development and implementation of a hybrid rocket motor thrust stand to investigate the relationship between combustion chamber pressure and graphite rocket nozzle erosion in hybrid rocket motors
… the largest contributors/oxidants to erosion are H2O, CO2, and OH, due to their high concentrations within the exhaust products and the low activation energy needed to react with the carbon surface. As such, a clear understanding of the rate of oxidation, or erosion, is critical to rocket motor …
-
An unexpected journey: experimental insights into magma and volatile transport beneath Erebus volcano, Antarctica
… the research is focused on volatiles (namely H2O, CO2, and S species) in the Ere- bus system: their abundances, solubilities, interactions, evolution, and ultimate contributions to degassing. Specifically, three key themes have been investigated, each employing their own experimental and …
-
Charakterisierung und Quantifizierung thermischer und diagenetischer Prozesse im karbonischen Akkretionsprisma in Nordchile
… repräsentiert. Das peak-metamorphe Fluid ist ein H2O-CO2-NaCl-dominiertes Fluid mit CH4±H2S. Ein H2O-NaCl-Fluid war über weite Bereiche der p-T-Geschichte der Chañaral-Mélange aktiv. Als Zeugen eines jüngeren Systems werden Einschlüsse mit CO2-CH4±H2S±N2 angesehen. Die Chañaral-Mélange …
-
Volatile chemistry, and nitrogen sources and fluxes, in subduction zones : insights from the Izu-Bonin-Mariana Arc
… margin volcanoes, and are dominated by H2O, CO2 and S species. Most samples have high N2/He and low CO2/N2,exc., due to addition of sedimentary nitrogen from the subducting slab. This is confirmed by δ15N values, which are generally positive – up to +5.5°. Quantitative mixing …
-
The interaction between silicate minerals and C-O-H bearing melts in the Earth's mantle
… (~180-400 km). Chemical compositions, including H2O contents, of hydrous melts, compatible with those that would form by small degree melting of an upper mantle peridotite at 180 km depth and near adiabatic temperatures, were determined using a series of iterative crystallization experiments. …
-
Guiana Shield diamonds, the sub-cratonic lithosphere, and kimberlite emplacement in the upper crust.
… from older ultramafic rocks (≥ 2 Ga) with a high H2O/CO2 volatile budget. These ancient diamonds also contain inclusions that preserve high Cr, Al, Mg, and low Ca, suggesting a harzburgitic paragenesis. Forsterite with elevated Mn, and chromite with low Fe3+/Fe2+ ratios suggest metasomatic …
-
Investigation into an adsorption and electrochemical regeneration process for the treatment of two trace level pesticides
… onto the sorbent and be fully oxidised to H2O, CO2 and inorganic ions. However, in the present study during electrochemical regeneration, adsorbate molecules desorbed from the Nyex surface and were subsequently transferred back into solution. However, some treatment was observed as …
-
Tassi di risalita vs. degassamento in sistemi vulcanici basici: quantificazione del parametro tempo come fattore primario di controllo dell’esplosività delle eruzioni
… composizionali degli elementi volatili (ovvero H2O, CO2, S) che sono generati dalla loro diffusione dalla parte interna degli emabyments verso il fuso esterno in risposta al degassamento indotto dalla decompressione. Modelli numerici permettono di calcolare il tempo in cui avviene il processo di …
-
The Role of Fluids in Geological Processes
The role and behavior of fluids in hydrothermal and magmatic environments have been studied. Experimental studies have been carried out to determine fluid properties, in natural environments and in both synthetic and natural fluid and melt inclusions. One of these studies dealt with the effect of …
-
Experiment and modeling : ignition of aluminum particles with a CO2 laser
Aluminum is a promising ingredient for high energy density compositions used in propulsion systems, explosives, and pyrotechnics. Aluminum powder fuel additives enable one to achieve higher combustion enthalpies and reaction temperatures. Therefore, to develop aluminum based novel and customized …