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 29 for “"reprecipitation"”.
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Seagrass-Mediated Carbonate Dissolution and Early Diagenesis in Bahamas Bank Sediments
… dissolution stoichiometry and carbonate reprecipitation, using the results from closed-system sediment incubation studies; (3) carbonate dissolution and reprecipitation across the broader Bahamas Bank. In Chapter II, I examined δ<sup>13</sup>C in the dissolved inorganic carbon (DIC) of …
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Beryllium analysis
… soluble in the boiling NaHCO3 and the repeated reprecipitation produce a very questionable degree of accuracy in the separations.
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NANOPARTICLE DEPOT FOR INTRAPERITONEAL CHEMOTHERAPY OF OVARIAN CANCER
… rather than the dialysis method due to drug reprecipitation caused by diffusion barrier. PTX release profiles from PNC-gel and PTX precipitate-gel (PPT-gel) were estimated in both sink- and non-sink conditions, where the latter simulated the peritoneal environment. In-vitro release kinetics …
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Distribution of Platinum Group Elements in the New Afton Alkalic Cu-Au Porphyry Deposit, Kamloops, British Columbia
… to subsequent hydrothermal re-mobilization and reprecipitation as platinum group minerals.
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Biomolecular Controls on Calcium Carbonate Formation by Amorphous and Classical Pathways: Insights from Measurements of Nucleation Rates and Isotope Tracers
… Four processes were considered: dissolution-reprecipitation, solid-state, or combinations of these end member processes. Isotope measurements of calcite crystals that transform from ACC have signatures that are best explained by dissolution-reprecipitation. The extent of isotopic mixing …
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Silica diagenesis and its pore-scale influence on the characteristics of the upper and lower Bakken shales, Williston Basin, North Dakota and Montana
… of radiolaria. Biogenic silica dissolution and reprecipitation is known to contribute to the development and/or preservation of pore space, ultimately affecting source rock quality and reservoir recoverability. In general, silica diagenesis occurs in multiple stages, beginning with amorphous …
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OVERPRESSURE AND COMPACTION IN THE LOWER KUTAI BASIN, INDONESIA
… of kaolinite, and quartz dissolution and reprecipitation. The result of this research is novel and possibly controversial: there is no other Neogene basin where the role of disequilibrium compaction in overpressure generation has been discounted.
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Diagenesis of the B chalk, B marl, and Fort Hays member of the Niobrara Formation, Denver Basin, Colorado
… of calcite cement through recrystallization and reprecipitation (seen through SEM), yielding more depleted isotope (δ18O) values as the system became more closed. Early diagenesis of the Fort Hays Member was supported by little evidence of compaction or pressure solution, as well as early …
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Understanding forgeability in highly reinforced cast-and-wrought superalloys
… of the secondary γ′ phase and its subsequent reprecipitation as very fine precipitates upon cooling. The commercial alloy Udimet 720 is used as a benchmark to explore this mechanism. A novel testing method is devised to assess forgeability and surface cracking through laboratory-scale tests on …
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Application of Calcium Phosphate based gels for encapsulation of therapeutic molecules
… the storage of gel in humid conditions, enabling reprecipitation of an apatitic phase. This variation in pore structure has a significant influence on the catalytic of encapsulated enzymes. In addition, the pH fluctuation of CaP based matrices during processing determines the activity of …
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Microstructural development, phase stability, and toughening in mullite matrix composites
… from the amorphous matrix; (2) dissolution and reprecipitation from mullite grains; (3) decomposition from zircon (ZrSiO$\sb4$), which had formed as an intermediate phase. The microstructural development in hot pressed composites was found to be significantly different from that in heat treated …
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Synthesis of Fluorene-based derivatives, Characterization of Optical properties and their Applications in Two-photon Fluorescence Imaging and Photocatalysis
… method is reported in chapter 3 using the reprecipitation method, whose surface was then modified using a naturally occurring surfactant, Lecithin, and were then successfully used in fluorescence cell imaging. Chapter 4 reports the design and synthesis of a fluorene-based compound using an …
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Thermal Evolution of MAS, YSZ and GZO Thermal Barrier Coating Materials in Benign and CMAS Rich Environments
… in the presence of CMAS, with solution-reprecipitation leading to the occurrence of the tetragonal-to-monoclinic phase transformation and a rise in stiffness. In contrast, MAS and GZO displayed excellent chemical resistance to CMAS. In MAS this was attributed to the formation of a …
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Effects of radiation damage and composition on phase separation in borosilicate nuclear waste glasses
… but this occurred alongside bulk-to-surface reprecipitation of CaMo- species. Overall, the components of internal radiation were often found to have opposing effects on the alteration of Si−O−B mixing in the glass, ion migration, and crystallite size. This led to the prediction that a …
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Pedogenesis, weathering processes, and elemental distribution along a soil climosequence in the southern Piedmont
… forms from both desilication of kaolinite and by reprecipitation after N a-feldspar dissolution at depth. Halloysite is common to all soils as the product of both feldspar and biotite weathering, thus illustrating the overriding influence of microenvironment in secondary minerals formation. Clay …
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Microstructural evolution during the homogenization heat treatment of 6XXX and 7XXX aluminum alloys
… (ii) precipitation of dispersoids; and (iii) reprecipitation of some of the secondary phases during post-homogenization cooling. The kinetics of the phase transformations are mostly diffusion controlled except for the η to S phase transformation in 7XXX alloys which is interface reaction rate …
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Calcite cements in carbonates of the Sverdrup Basin, Canadian Arctic Archipelago.
… systems and involved more than one dissolution-reprecipitation step. In an associated trace element study, application of Secondary Ion Mass Spectrometry (SIMS) enabled direct measurements of chemical composition in thin sections, constituting a precedent. The precisions obtained were 12, 6, 6 …
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Multidisciplinary analysis of a polymetamorphic terrane, western New England
… garnet occurred by metasomatic dissolution and reprecipitation along porphyroblast surfaces in the presence of a metamorphic fluid. Diffusion seems significant for changing the garnet composition during the initial overprint only as an agent to move material in an intergranular fluid. The …
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From the Appalachians to the Alps: Constraints on the Timing, Duration, and Conditions of Metamorphism at Convergent Margins
… punctuated heating is obscured by dissolution-reprecipitation reactions that variably recrystallize monazite and decouple trace element chemistry from isotopic age and significantly restrict equilibrium length-scales. Chapters 4 and 5 examine the dynamic interplay between transient fluid flow, …
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Deportment of radionuclides in copper concentrate from Olympic Dam
… acid-leaching, through coupled dissolution-reprecipitation mechanisms. Laser ablation inductively coupled plasma mass spectrometry and nanoSIMS both provided excellent visual evidence for Ra uptake, well in agreement with published results from other research teams As a whole, the data set …
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