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 479 for “"tracers"”.
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Nanoparticles for Oil Dispersants and Nano Tracers
Nanoparticles are promising candidates to improve the efficiency of various activities in oil and gas industry such as reservoir characterization, enhanced oil recovery, and oil dispersion due to their large surface area, interfacial activity, and tunable chemical properties. In this dissertation, …
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Reduce the charge risking applying migration tracers
… main charge risk by applying molecular migration tracers and uses benzocarbazoles plus methylxanthones as migration tracers to reconstruct migration routes and reservoir filling histories in the Norwegian North Sea. Benzocarbazoles and methylxanthones are polar compounds and undergo systematic …
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Galactic dynamics : multiple tracers and gravitational lensing
This Thesis explores the use of independent dynamical probes (multiple populations, gravitational lensing) to infer the prope1ties of Dark Matter (DM) haloes and investigate scenarios of galaxy formation. It begins with a study of the virial properties (flattening and global anisotropy) of stellar …
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Foraminiferal and coralline barium as paleoceanographic tracers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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Development of Environmental Tracers for Sediments and Phosphorus.
… transport processes. A large range of sediment tracers exists; however, to date there has been no combined use of tracers which represent the full particle size range of sediments transported in overland flow. This is relevant because particles of different sizes show differing transport …
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Fluorescent gaseous tracers for three dimensional flow visualization.
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1972
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A study of North Atlantic ventilation using transient tracers
… oxygen utilization rate estimates are discussed. Tracers that equilibrate rapidly with the atmosphere, such as 3He and the CFCs, have lower apparent ventilation time scales than t racers, such as tritium and radiocarbon, t hat are reset slowly in the surface layer. The results of a simple …
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Development and application of novel tracers for environmental applications.
Novel glass tracers, organic and inorganic polymers based on narrow band atomic fluorescence, have been developed for deployment as environmental tracers. The use of discrete fluorescent species in an environmentally stable host has been investigated to replace existing toxic, broad band molecular …
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Biogenic Tracers Through the Holocene on the Alaskan Shelf
<p>Dramatic environmental changes in the Arctic Ocean have been observed for the last two decades including changing the amount of sea ice thickness and extent, and increased river discharge. In order to put these and other current day observations into historical context and perhaps reveal …
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Evaluation of new PET tracers for receptor tumour imaging
… their potential application as PET imaging radiotracers for imaging CXCR4 expression levels in vivo. In this study, novel restricted CXCR4 macrocyclic compounds synthesized by Archibald and co-workers, Cu2CB-Bicyclam and CuCB-Bicyclam were tested and shown to be potent CXCR4 antagonists, with …
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Development of 89Zirconium-PET Tracers for Immune Cell Imaging
The use of cell-based therapies as a living drug have gained considerable attention for the treatment of a range of conditions such as genetic diseases, autoimmune disorders and cancer. The emergence of genetically engineered T cells expressing chimeric antigen receptors (CAR T-cells), together …
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Non-reactive and chemically reactive tracers : theory and applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1985.
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A study of North Atlantic ventilation using transient tracers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Geochemical tracers in the deep-sea and the North Sea
This thesis contains manuscripts about the inorganic geochemistry of the deep-sea and the North Sea, which have been published or submitted for publication. Typical element/Al ratios indicate eolian, continental input of loess material during the last Heinrich-events. In the Arabian Sea, the …
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Isotopic Tracers as Evidence of Denitrification in the Karlsruhe Aquifer
<p>The Karlsruhe Aquifer of north-central North Dakota has experienced considerable nitrate contamination sparking an investigation by the North Dakota State Water Commission. Certain portions of the aquifer have experienced nitrate-N concentrations of up to seven times the drinking water standard. …
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Time-scales of passive tracers in the ocean with paleoapplications
… of the ocean to passive and active tracers is critical when interpreting paleodata from sediment cores. Surface-injected tracers are not spreading instantaneously or uniformly throughout the ocean. To obtain insights into these time-scales, a transition matrix is used to compute …
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Zinc and cadmium in benthic foraminifera as tracers of ocean paleochemistry
Benthic foraminiferal δ13C, Cd/Ca, and Ba/Ca are important tools for reconstructing nutrient distributions, and thus ocean circulation, on glacial-interglacial timescales. However, each tracer has its own "artifacts" that can complicate paleoceanographic interpretations. It is therefore …
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