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Showing 1 to 17 of 17 for “"Radioactive tracers"”.
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Uso de traçadores na modelagem de unidades de aeração e decantação em estação de tratamento de esgotos
… and Bromine-82 were used as fluorescent and radioactive tracers. The hydrodynamic behaviour of both units were analysed through the comparison of experimental response curves with well known models. A procedure to determine the influence of suspended solids on fluorescence of the …
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Diffusion of titanium and niobium in b.c.c. Ti-Nb alloys
… diffusion coefficients for titanium and niobium radioactive tracers were simultaneously measured in Ti, Ti94.6, Ti80.4, Nb19.6 and Ti64.3Nb35.7 over the temperature range from 9S0°C to 1511°C using 643 3S standard lathe sectioning techniques. The samples were initially heat treated by annealing …
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The theory and practice of perturbation chromatography applied to the investigation of H2 and CO chemisorption on a Co-Mo-A1 catalyst
… technique of perturbation chromatography using radioactive tracers has been successfully applied to chemisorption studies. Using a flow system with on-line mixing of the pure components, carrier gases of various constant compositions of CO and He, H2, and He, and CO, H2, and He were passed over …
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A Study of Transport of Micellar Fluids in Porous Media
… of both partitioning and non-partitioning radioactive tracers were run for each steady-state experiment. The experimental effluent tracer data from these experiments were analyzed by a capacitance model. The phase dispersivities and dispersion coefficients estimated from the capacitance …
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FACTORS AFFECTING THE TRANSPORT OF SOLUTES THROUGH BRONCHIAL MUCUS
… studied. Using the method of layer analysis and radioactive tracers the diffusion coefficients and self diffusion coefficients of several antibiotics and of glucose, sucrose, inulin and decamethonium iodide in mucus have been determined. Human bronchial mucus subjected to a homogenization - …
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Fluorescence Off-On Sensors for F-, K+, Fe3+, and Ca2+ Ions
… convenience, make it a promising tool to replace radioactive tracers for most biochemical measurements, avoiding the high expense and difficulties of handling radioactive tracers. Among the wide range of applications of fluorescence technique, fluorescent sensing of various cations and anions is …
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Further studies on the behavior of fungi in the presence of radioactive isotopes
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Bacteriology, 1949
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Translocation of radiophosphorus in a stream by bacteria and inorganic ions
Thesis (M.S.)--Michigan State University of Agriculture and Applied Science. Dept. of Fisheries and Wildlife, 1962
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Anthropogenic and natural radioisotopes as tracers for contaminant sources and particulate fluxes
Radioactive isotopes act as nuclear clocks that are utilized to trace and measure rates of chemical, biological, physical, and geological oceanographic processes. This thesis seeks to utilize both artificial (e.g., released from anthropogenic sources) and natural radioisotopes as tracers within the …
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Investigating groundwater derived nutrient fluxes within Tauranga harbour, New Zealand
… field-based measurements of naturally occurring radioactive tracers (radium). The modelled flushing times across all harbour regions (~4 – 20 days) agreed well with calculated apparent Ra ages. The average apparent radium water ages were revealed to be younger on spring tide at the harbour scale, …
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What do paleo-geochemical tracers tell us about the deep ocean circulation during the last ice age?
Paleo-tracers such as carbon 13 and cadmium show that the deep Atlantic was enriched in nutrients during the Last Ice Age. The conventionally accepted interpretation of these higher nutrient levels is that a reduction of the rate of formation of nutrient-depleted Lower North Atlantic Deep Water …
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A radiocarbon method and multi-tracer approach to quantifying groundwater discharge to coastal waters
… SGD) can be difficult to quantify. Geochemical tracers of groundwater discharge can reflect the cumulative SGD flux from numerous small, widely dispersed, and perhaps ephemeral sources such as springs, seeps, and diffuse discharge. The natural radiocarbon content (Δ14C) of dissolved inorganic …
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Improved Visualization and Quantification for Hyperpolarized 129Xe MRI
… However, this V/Q scan evolves the usage of radioactive tracers and is limited by both poor temporal and spatial resolution. Thus, there has been considerable interest in developing methods that can comprehensively evaluate lung function non-invasively and can provide 3D resolution. …
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Radium isotopes as tracers of coastal circulation pathways in the Mid-Atlantic Bight
… in seawater, were used as coastal water mass tracers. The final study was comprised of data from 5 cruises, with a total of 8 cross-shelfbreak transects. Two areas were studied, a northern Mid-Atlantic Bight transect south of Nantucket Shoals, and a southern Mid-Atlantic Bight series of …
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Constraining the North Atlantic circulation with transient tracer observations
The capability of transient tracers to constrain the ocean circulation in the North Atlantic is explored. Study of an idealized tracer shows that inferences of circulation properties from transient state distributions are impacted by uncertainties in the time-varying boundary conditions and sparse …