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 41 for “"PFCs"”.
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Towards understanding the fate of perfluoroalkyl compounds (PFCs) within urban environments: implications for human exposure.
… the presence of perfluoroalkyl compounds (PFCs) in UK indoor and outdoor microenvironments and the impact this may have on human exposure. Both PFOS and PFOA were chosen for analysis (via LC-ESI-MS/MS) because of their highly persistent behaviour. Additionally, perfluorohexane sulfonate …
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Pancreatic fluid collections : towards a classification to facilitate treatment selection
… the management of pancreatic fluid collections (PFCs) undertaken at Groote Schuur Hospital. The aim of the study was to review the management outcome, via different treatment modalities, of pancreatic fluid collections according to a locally derived classification. Patients with symptomatic and …
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Environmental Toxins and Essential Trace Elements at Delivery and ADHD
Perfluorinated compounds (PFCs), phthalates, manganese and selenium are ubiquitous in the environment and humans and influence fetal growth and development. Register and biobank based case-control studies were conducted to investigate the relationship between prenatal exposure to these chemicals …
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Characterization of Liquid Metal Free Surface Response to an Electromagnetic Impulse and Implications for Future Nuclear Fusion Devices
… candidates for use as plasma facing components (PFCs) in fusion devices to mitigate heat loading, limit damage due to erosion, and possibly breed tritium. When used as electrodes, such as in z-pinch devices, PFCs are subject to large current and magnetic flux densities resulting in large Lorentz …
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Power handling of liquid metal infused trenches in the EAST Tokamak
Flowing liquid metal PFCs offer an attractive solution to the problems currently facing conventional solid high-Z PFCs such as: the sputtering of high-Z impurities into the core, fuzz formation from helium implantation and thermal damage (melting, blistering and cracking.) By presenting a …
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Relationship of persistent organic pollutants to ADHD in children : a meta-analysis
… ethers (PBDEs), perfluorinated compounds (PFCs), and phthalates are individually analysed; however, none of these can be shown to have a significant relationship to ADHD. Unfortunately, meta-analysis of the sub-categories is limited by the small number and heterogeneity of articles …
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Gamma ray production cross sections of proton bombardment of fluorine for light element analysis and depth profiling
… techniques that monitor the conditions of PFCs are useful. One ion beam analysis (IBA) diagnostic technique utilizes particle induced gamma emission (PIGE) analysis to diagnose the conditions of PFCs. Gamma production differential cross section data is essential to PIGE because it provides …
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Evaluation of unsaturated fluorocarbons for dielectric Etch applications
… warming compounds, known as perfluorocompounds (PFCs) for dielectric etch applications. The release of global warming compounds from this and other sources is suspected to result in changes in the earth's climate and weather patterns. Quantitative targets for emissions reduction set by the World …
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Development of accelerator based spatially resolved ion beam analysis techniques for the study of plasma materials interactions in magnetic fusion devices
… addition, the retention of tritium (T) fuel in PFCs or plasma co-deposited material can disrupt the fuel cycle of the reactor while contributing to radiological and regulatory issues. The current state of the art for PMI research involves using accelerator based ion beam analysis (IBA) …
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Long term trends of halogenated trace gases, hydrocarbons, alkyl nitrates and of the oxidative capacity of the atmosphere
… substances (halons) and greenhouse gases (PFCs, SF5CF3, HFC-227ea) are reported using measurements from Cape Grim, Tasmania. A two-dimensional global atmospheric chemistry transport model is used to derive global annual emission histories of these long lived gases. Emissions of the halons …
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Synthesis and Characterization of Wholly Aromatic, Water-Soluble Polyimides and Poly(amic acid)s Towards Fire Suppression Foams
… fires. AFFFs utilize perfluorinated compounds (PFCs) like perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA), which exhibit toxicity, bioaccumulation, and persistence in the environment resulting in the presence of fluorosurfactant chemicals in environments either through …
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Development of novel adsorbents for the removal of emerging contaminants from water
… such as estrogen hormones, perfluoro compounds (PFCs), bisphenol-A (BPA), and 1,4-dioxane have been detected in natural water at many places. The existing conventional wastewater treatment systems are not designed for the removal of these contaminants. This critical issue leads to the need for …
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Electrical Properties of Macro-Fiber Composite Actuators and Sensors
… more responsive than regular monolithic devices, PFCs promise to revolutionize the application of piezoelectric materials. Developed by the NASA-Langley Research Center, the Macro-Fiber Composite (MFC) actuator and sensor is the most sophisticated PFC device yet invented. With superior qualities …
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Study of temperature dependence of hydrogen retention in lithium coatings on stainless steel with the Materials Analysis Particle Probe (MAPP)
… Proper conditioning of Plasma Facing Components (PFCs) has shown to have dramatic effects in important plasma parameters as plasma current and density. Several conditioning approaches have been developed and investigated e.g. plasma glows and vessel bake outs. Furthermore, conditioning via the …
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Development and testing of an in situ method of ion beam analysis for measuring high-Z erosion inside a tokamak using an AIMS diagnostic
… to studying the erosion of bulk, high-Z PFCs like molybdenum and tungsten. Thus, a new method of ion beam analysis (IBA) has been developed to expand the capabilities of AIMS to directly measure this high-Z bulk erosion. This new method, called DEA (Depth markers for Evaluating high-Z …
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Dynamic interactions between energetic D and He ions on lithium-tungsten plasma-facing interfaces
… is placed on the plasma facing components (PFCs) with an increase of fusion power production. Currently within operating experimental reactors, the PFCs need to handle only a few MW/m$^2$ of heat flux and particle fluxes of $\sim$10$^{22}$ ions/m$^2$s but with the construction of the …
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Trends and inferred emissions of atmospheric high molecular weight perfluorocarbons
… the five high molecular weight perfluorocarbons (PFCs): decafluorobutane (C 4 F 1 0 ), dodecafluoropentane (C5 F1 2 ), tetradecafluorohexane (C 6 F14 ), hexadecafluoroheptane (C 7F 16 ) and octadecafluorooctane (C8 F 18 ). Their atmospheric histories are based on measurements of 36 Northern …
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Advanced geometries for dryout mitigation in temhd-driven liquid lithium systems
… efficient fusion. Plasma facing components (PFCs) must bear the brunt of these extreme conditions, which can result in a myriad of damage mechanisms on even the most resilient materials. One method of mitigating the damage in solid PFCs is through the use of liquid metals, specifically liquid …
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REMOVAL OF EMERGING CONTAMINANTS FROM AQUEOUS SOLUTION BY OZONE -BASED PROCESSES
… study 1-4, dioxane, perfluorinated compounds (PFCs), N,N-Diethyl-metatoluamide, and three pharmaceuticals sulfamethoxazole, trimethoprim and carbamazepine have been selected. The effect of different process parameters such as chemical dosages, ozone weight percent, ozone flow rates, etc. on …
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Degradation and defects in plasma facing components for future fusion devices
… from neutrons. The plasma facing components (PFCs) are optimised the high heat flux energy removal. PFCs are composed of a thick armour joined to an actively cooled heat sink to provide the necessary transfer of the incident power to the cooling system. During normal operation these components …
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