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 11 of 11 for “"Analytical uncertainty"”.
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Isotopic fractionation of chromium and uranium during Cr(VI) reduction by ascorbate and U(VI) reduction by sulfide
… by 0.17‰ after about 60% reduction, but the analytical uncertainty was about 0.15‰.
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Computational and Machine Learning-Reinforced Modeling and Design of Materials under Uncertainty
… design microstructures under inherent material uncertainty by incorporating machine learning techniques. To achieve this objective, the study addresses gradient-based and machine learning-driven design optimization methods to enhance homogenized linear and non-linear properties of …
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The environmental behaviour of beryllium-7 and implications for its use as a sediment tracer
… confidence in key data and elucidate sources of uncertainty. Through a range of laboratory and field studies, this thesis aims to explore knowledge gaps relating to i) the temporal and spatial dynamics of 7Be activity in rainfall which has importance in the context of estimating fallout input …
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High-precision U/Pb geochronology of large igneous provinces and mass extinctions : testing coincidence and causation
… of mass extinction and magmatism outside the analytical uncertainty on dates populating age models is possible, allowing detailed investigation of a causal connection. The current work develops zircon and perovskite minerals as accurate, high-precision geochronometers on the mafic rocks that …
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Nonlinear uncertainty analysis for multiple criteria natural resource decision support systems
… the computational efforts associated with analytical uncertainty analysis. As for the decision component, a generalized closed form solution of the WQDSS's decision model is derived to allow consideration of a vector of quantitative scale factors. The factors indicate the relative …
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GC-C-IRMS : a new technique to characterize and correlate oils and source rocks
… is generally less than 1 ‰ and often within the analytical uncertainty. Previous molecular and isotopic geochemical techniques for correlating oils and sources can not be used independent of each other. The molecular compositions of oils change due to processes such as maturation, biodegradation, …
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The Speciation of Dissolved Uranium in Marine Waters
… uranium by incorporating UV-oxidation into the analytical scheme was also developed (UV<sup>-238U</sup>).</p> <p>Samples were collected from the surface of open ocean and coastal waters. In open ocean water, no organic uranium, taken as the difference between the UV<sup>-238</sup>U sample and …
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Multi-stage orogenic gold mineralization of the Pine Lake greenstone belt: evidence from the Seabee Gold Operation, Trans-Hudson orogen, northern Saskatchewan
… age for orogenic mineralization is outside of analytical uncertainty (2s) of the weighted mean 207Pb/206Pb age for a granodiorite intrusion at Mac south (ca. 1882 Ma), eliminating magmatic fluids as a source for gold during syn-late-D3 mineralization. This study also presents the first direct …
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A heavy stable isotope approach to tracing mantle source and process
… ocean islands. I also find that, given current analytical precision, the five stable isotope systems examined here are not predicted to be sensitive to mantle potential temperature variations through equilibrium isotope fractionation processes, for the melting of peridotite. By contrast, source …
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Managing Uncertainty in Capacity Investment, Revenue Management, and Supply Chain Coordination
"Uncertainty" is used broadly to refer to things that are unknown or incompletely understood. In operations management, basic sources of uncertainty may include decision uncertainty, model uncertainty, analytical uncertainty, data uncertainty, and so on. Although uncertainty is unavoidable in …
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The seasonal cycling and physico-chemical speciation of iron on the Celtic and Hebridean shelf seas
Shelf seas represent an important source of iron (Fe) to the open ocean. Additionally, shelf seas are highly productive environments which contribute to atmospheric carbon dioxide drawdown and support large fisheries. The work presented in this thesis describes the seasonal cycle of Fe in the …