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 18 of 18 for “"Lead content"”.
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A study of the microstructure and optical properties of thin load- dielectric cermet films
… of radio frequency-sputtered, thin lead-dielectric cermet films. Once defined, this microstructure is used to obtain theoretical film refractive indices. The Maxwell Garnet theory provides a basis for the theoretical results. Measurements of film transmission and reflectivity are …
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Scanning tunneling spectroscopy of lead-substituted bismuth strontium copper oxide
The hole-doped cuprate Bi ... is doped with lead to the solubility limit of x = 0.38 and studied using STM/STS in the overdoped regime where Tc < 2K. Despite the high lead content, residual supermodulations are observed in the BiO plane. In agreement with previous studies on (Pb,Bi)-2201, there is …
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Machinability enhancement of non-leaded free cutting steels
… free cutting steels have been alloyed with lead in order to improve machinability. Enhanced machinability is characterised by low tool wear, short breaking chips, high surface quality and low cutting forces. Although the lead content in steels is comparably low, leaded steels are under …
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The biogeochemistry of 210Pb and 210Po in fresh waters and sediments
The focus of this work was geochemical cycling of 210Pb in lakes, including the water column, sediments, and their interactions with each other. A special goal was to elucidate processes that might influence the distribution and fluxes of the radionuclide in ways that could effect 210Pb sediment …
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Uranium Leached From Pre-1970's Ceramic Dinnerware
… years to produce a wide range of colors. In low-lead glazes, the presence of uranium produces yellows and ivories, whereas uranium in high-lead, low-fired glazes produces deep orange or red colors. The purpose of this research was to use atomic absorption spectrophotometry to determine the lead …
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Human health risk assessment: recreational use of a brownfield site volunteer Army ammunition plant chemical farmers industries, inc., lease area Chattanooga, Tennessee
This thesis investigates the suitability of a lead-contaminated Brownfield, the Volunteer Army Ammunition Plant (VAAP) site in Chattanooga, for recreational use such as children's softball. The assessment includes a review of soil sample data obtained at the VAAP by IT Corporation from 1994 to …
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Reactions of Organolead Compounds Under Natural Conditions
Certain compounds containing lead atoms bonded to alkyl groups are of much greater toxicity than their non-alkylated analogues. The tetra-alkyl lead compounds are used as anti-knock additives in petrol and are discharged into the atmosphere by exhaust emission, spillage, and evaporation. Because of …
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Investigation of the Distribution of Lead (Pb) in Soil in Rochester, NY: Correlation with Children’s Blood Lead Levels
Despite the outlawing of both leaded paints and gasoline decades ago, lead poisoning remains a severe health issue, particularly for children aged 5 and under due to their hand-to-mouth tendencies and underdeveloped gastrointestinal tracts. Lead from paint typically only presents itself as an issue …
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Effects of low level lead and cadmium on reproduction in Peromyscus leucopus and a study of lead concentration in small mammals from old orchards
Lead and cadmium frequently occur together as contaminants in polluted environments such as roadsides, urban areas, mines, and smelters. Few studies have been conducted to examine the possible interactive effects these metals may have on reproduction of wild species. The first part of this study …
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Interplay of Water Chemistry and Entrained Particulates in Erosion Corrosion of Copper and Nonleaded Alloys in Potable Water Systems
… and high temperatures. Additionally, some nonleaded alloys introduced after the passage of a new federal law restricting lead content in plumbing, have been anecdotally implicated as failing prematurely from erosion corrosion compared to traditional alloys. This dissertation includes 1) a …
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M13 virus-enabled assembly of 3D nanostructured composites : synthesis and applications in solar energy conversion and electrochemical energy storage devices
… efficient PSCs was developed that recycled lead content from discarded car batteries. Perovskite films, assembled using materials sourced from either recycled battery materials or high-purity commercial reagents, showed the same material characterizations and the identical photovoltaic …
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Mineral element profiles of animal wastes and edible tissues from cattle fed animal wastes
… <.05) in livers of steers fed waste. In trial II lead content was higher (P <.05) in fat of waste fed cattle and liver copper was higher (P <.05) in conventionally-fed steers. In a long term experiment, currently in its sixth year, cows were wintered on hay, 804 litter and 20% corn grain with and …
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Addressing and Assessing Lead Threats in Drinking Water: Non-Leaded Brass, Product Testing, Particulate Lead Occurrence and Effects of the Chloride to Sulfate Mass Ratio on Corrosion
… over adverse health effects from low level lead exposure motivated reassessment of lead occurrence in drinking water, from the perspective of 1) possibly eliminating lead from new brass materials, and 2) performance testing of existing products. During the course of this thesis work, it was …
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Sintering kinetics and properties of highly pure lead zirconate titanate ceramics
Lead zirconate titanate (PZT) has been widely applied in actuators and sensors due to its excellent piezoelectric and ferroelectric properties. However, impurities, one of the major problems involved in the mass production of PZT ceramics, have not attracted enough attention. In this thesis, …
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Antimony and acetaldehyde migration from Nigerian and British PET bottles into water and soft drinks under typical use conditions. Concentration of migrants and some trace elements in polyethylene terephthalate and in bottled contents.
… from the bottle matrix into the liquid contents. Both antimony trioxide and acetaldehyde belongs to Group 2B (possible carcinogens) in the International Agency for Research on Cancer (IARC) carcinogen classification. Additionally acetaldehyde associated with alcoholic beverages (derived …
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Advancing Fundamental Understanding of Lead-Tin Solder Corrosion in Drinking Water: Nitrate Spallation Mechanism, Inhibition by Zinc Orthophosphate and Free Chlorine, and Implications for Canned Foods
Given rising concern over elevated lead in drinking water in the aftermath of the Flint Water Crisis, forthcoming revisions to the U.S. EPA Lead and Copper Rule (LCR), and federal funding designated for replacing lead service lines, lead-tin solder corrosion control will become increasingly …