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 59 for “"PCF"”.
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The PCF and the question of intellectual workers : the crisis of social ideology
… adversaries. The thesis posits the view that the PCF has failed to make correct distinctions between its potential allies and adversaries and has thus pursued unsuccessful alliance strategies. The thesis contributes towards a scientifically-based understanding of one of the reasons governing the …
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Measurement of Temperature, Refractive Index, or Axial Acceleration with Etched PCF Microfiber Structure
In the field of optical fiber sensors, one of the most versatile structures is the Fabry-Perot interferometer. This thesis will present a novel sensor based on an Intrisnic Fabry-Perot Inferferometer (IFPI) cavity to measure axial acceleration, refractive index, and temperature. The sensor …
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Příprava a testování SNOM sond speciálních vlastností
Fotonická krystalická vlákna (PCF) představují slibný nástroj pro spojení technik známých z mikroskopie rastrovací sondou, elektronové mikroskopie a systémů pro vstřikování plynu. Přivedení světla a přenos pracovního plynu současně do blízkosti vzorku umístěného uvnitř elektronového mikroskopu …
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Application of Salt Whey in Process Cheese Food Made from Cheddar Cheese Containing Exopolysaccharides
… utilize salt whey in making process cheese food (PCF) from young (3 week old) Cheddar cheese. To maximize the level of salt whey in process cheese, low salt (0.6%) Cheddar cheese was utilized. Since salt reduction causes undesirable physicochemical changes during extended cheese ripening, young …
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Empirical Evaluation of a Technology-rich Learning Environment
… affect students. Called the PCs for Families (PCF) project, its goal was to learn what could be achieved if technology access, support, and curriculum integration could be eliminated as obstacles or constraints in the classroom and at home. A technology-rich classroom was created, with the …
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Finite element modelling of photonic crystal fibres
Photonic crystal fibre (PCF), a new kind of optical fibre, has many air-holes in their cross-section and has potential applications to new optical communication systems. The main objective of this research is the modelling of photonic crystal fibre to identify the fundamental and higher order …
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Random Variable Spaces: Mathematical Properties and an Extension to Programming Computable Functions
… boundaries of Programming Computable Functions (PCF) by introducing a novel collection of categories referred to as Random Variable Spaces. Originating as a generalization of Quasi-Borel Spaces, Random Variable Spaces are rigorously defined as categories where objects are sets paired with a …
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Block Copolymer Derived Porous Carbon Fiber for Energy and Environmental Science
… methods for designing porous carbon fibers (PCF). Later sections focus on original research. A controlled radical polymerization method, reversible addition-fragmentation chain transfer (RAFT), enabled a synthetic design for a block copolymer precursor, poly(methyl methacrylate) (PMMA) and …
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Finite element characterisation of photonic crystal fibres
… and leakage losses of Photonic Crystal Fibres (PCF). A modal solution approach including the implementations of the conformal transformation and the Perfectly Matched Layer (PML) were undertaken to determine the bending and leakage losses of several designs of Photonic Crystal Fibres. This was …
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Alternative primary treatment for energy-positive wastewater treatment: an exploration of pile cloth media filtration
… The adaptation of pile cloth filtration (PCF) for primary treatment can enhance the performance of primary treatment, increase secondary treatment capacities, enhance renewable energy production, and reduce costs of WWTFs. To address these research needs, this dissertation explores the …
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The French Communist Party and the Algerian war : an ideological turning point?
… detailed study of the Party ' s line on the war, PCF publications were contrasted with the texts produced by the opposition.Three main axes were identified crystallising discussion within the Party during the Algerian war: The relationship between France and Algeria and the Party ' s attitude to …
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Photoacoustic photonic crystal fiber gas sensor
… times, hollow-core photonic crystal fiber (HC-PCF) has emerged as superior gas cell for standard absorption-based laser spectroscopy due to its small size, compatibility with fiber-based optical components, and easily attainable long light-gas interaction path lengths. However, the possibility …
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Contribution à la réalisation de composants optiques a base des fibres microstructurées air/silice
… l’étude a été consacrée à l’utilisation des PCF dans la conception et la réalisation des composants optiques et particulièrement les réseaux de Bragg à long pas LPFG (Long Period Fiber Grating). Dans le cadre de cette thèse, il a été question en premier lieu d’étudier le principe de la …
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Investigations towards the development of a novel multimodal fibre optic sensor for oil and gas applications.
… configuration, based on photonic crystal fibre (PCF) and utilising a multiwavelength approach, is proposed for the first time for O&G applications. This thesis reports computational and experimental investigations into the new multimodal sensing methodology, integrating both optical phase-change …
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Gamma irradiation response of photonic crystal and standard optical fibre Bragg grating sensors for radiation dosimetry
… FBGs written in Photonic Crystal fibre (PCF) were examined under similar regimes and conditions. Current research suggests that the FBGs performance, when exposed to Cobalt-60 gamma irradiation, can suffer cross sensitivity problems resulting from different external effects such as …
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Using saturated absorption spectroscopy on acetylene-filled hollow-core fibers for absolute frequency measurements
… of µm) and low-loss guidance. Furthermore, HC-PCF can be made into fiber cells that could be directly integrated into existing telecommunications networks. Efforts were made to fabricate these fiber cells with a low pressure of molecules trapped inside, but this has proven to be quite …
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Porous Carbon Fiber Functionalization and Thermochemical Degradation of Polystyrene-based Plastics for Resource Recovery
… waste accumulation. First, porous carbon fiber (PCF) derived from PAN-based block copolymer was synthesized and functionalized for the extraction of REEs. Second, the thermochemical degradation of PS and PS-based engineering plastic into benzene and alkylbenzene were explored. In the first …
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Geochemistry and Petrography of Beartrack Mine, Lemhi County, Idaho
… zone associated with the Panther Creek Fault (PCF), which locally separates metasediments of the Proterozoic Yellowjacket Formation and a Proterozoic quartz monzonite. Dikes of unknown ages cross cut the two formations. Sericitic alteration is dominant and follows the PCF extending laterally up …
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Block Copolymer-derived Porous Polyimides and Carbon for High-Performance Energy Storage
… In this dissertation, porous carbon fiber (PCF) supported MnO2 (PCF@MnO2), comprising nanometer-thick MnO2 deposited on block copolymer-derived PCF, serves as a fast-charging cathode. The high electrical conductivity of PCF and fast ion (de-)insertion in nanometer-thick MnO2 both contribute …
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The role of private capital flows and financial deepening in the economic growth of South Africa
… examines the role of Private Capital Flows (PCF) and Financial Deepening in the economic growth of South Africa. Using secondary data obtained from the South African Reserve Bank and the World Bank online databases for the period 1990 to 2015, we examine the relationship between these three …
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