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Dissertations / Theses on the topic 'PFCB'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Vasquez, Erick S. "Rheological, thermal and processing studies of perfluorocyclobutyl (PFCB) polymers." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1247509068/.

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2

May, Nathanael Henderson. "A Morphological Study of PFCB-Ionomer/ PVdF Copolymer Blend Membranes For Fuel Cell Application." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76853.

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A new material for use as a proton exchange membrane in fuel cells has been developed: a blend of a perfluorocyclobutane-based block ionomer (S-PFCB) and Poly (vinylidene-co-hexafluoropropylene) (Kynar Flex, KF). This thesis details the work done thus far to characterize the morphology of this material, using small angle x-ray scattering, differential scanning calorimetry, atomic force micrscopy, and some other techniques to a lesser extent. Small angle x-ray scattering (SAXS) of pure S-PFCB showed a strong block copolymer- associated phase separation, on the order of 25 nm. Differential sca

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3

Rojo, Duran Sergio. "Synthèse d’ionomères par polycondensation directe de monomères fonctionnels." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1294/document.

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Ce manuscrit de thèse décrit la synthèse et la caractérisation d'ionomères conducteurs protoniques pour une application en tant que membrane pour pile à combustible. La stratégie adoptée pour la synthèse de ces polymères repose sur la polycondensation directe de monomères fonctionnels. Pour ce faire, et dans le cadre d'un travail important de chimie organique, la synthèse de trois monomères sulfonés ainsi que de trois monomères phosphonés a été réalisée. Différents polymères perfluorés (polyperfluorocyclobutane (PFCB) et polyaryléthers (PAE) (Polyétheréther cétone (PEEK) et Polysulfone (PS), o

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4

Osborn, Angela Michelle. "Investigation of Phase Morphology and Blend Stability in Ionomeric Perfluorocyclobutane (PFCB)/Poly(vinylidene difluoride) (PVDF) Copolymer Blend Membranes." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77265.

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This research is focused on the investigation of phase morphology and blend stability within ionomeric perfluorocyclobutane (PFCB)/poly(vinylidene difluoride) (PVDF) copolymer blend membranes. The morphologies of these unique materials, designed as proton exchange membranes (PEMs) for proton exchange membrane fuel cells (PEMFCs), have been examined not only in the as-cast/as-received state, but also as a function of exposure to various ex-situ aging environments. The morphological investigations used to probe the response of these ionomer blends have been designed to mimic the environment with

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5

Finlay, Katherine A. "Characterization of Sulfonated Perfluorocyclobutane /Poly(Vinylidene Difluoride)-co-Hexafluoropropylene (PFCB/PVDF-HFP) Blends for Use as Proton Exchange Membranes." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/47475.

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The research herein focuses on the characterization of a PFCB/PVDF-HFP (70:30 wt:wt) blend fuel cell membrane including the constitutive and morphological properties, how these properties predict the stresses incurred under fuel cell operating conditions, and how these properties change over time under fuel cell operating conditions. Characterization was performed to mimic temperature and moisture conditions found in operating fuel cells to understand how these materials will behave in service. This included thermal and hygral expansion, mass uptake, and the stress relaxation modulus. These

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6

Siuta, Chase Michael. "Measuring Material Properties of Proton Exchange Membranes using Pressure Loaded Blister Testing and Digital Image Correlation." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76858.

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The strength and durability of proton exchange membranes for use in fuel cells has received much attention recently due to the increased push for sustainable alternatives to the internal combustion engine. To be viable, these alternatives must have comparable lifetimes and power outputs to the internal combustion engines they replace. Chemical degradation was once viewed as the most common culprit of early fuel cell failure, but as membranes and catalysts improved, mechanical failure became an important factor. As a result, fundamental research on the mechanically-induced failure mechanisms of

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7

Addo, Isaac D. "Diazonium 4-(trifluorovinyloxy) Perfluorobutanesulfonyl Benzenesulfonimide Zwitterionic Monomer Synthesis." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3137.

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3-Diazonium- 4-(trifluorovinyloxy) - perfluorobutanesulfonyl benzenesulfonimide zwitterionic monomer (see figure 1) is proposed to be polymerized and further act as a new electrolyte for Polymer exchange membrane fuel cells (PEMFCs). One reason is that, the aromatic trifluorovinyl aryl ether (TFVE) group can easily be homopolymerized to aromatic perfluorocyclobutane (PFCB) polymer. Furthermore, the diazonium moiety in the monomer is expected to covalently attach the electrolyte to the carbon electrodes support. The perfluoroalkyl(aryl) sulfonimide (PFSI) pendant provides good chemical and mech

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8

Li, Bo. "Development of polymer nano/micro-systems as contrast agents for ultrasound molecular diagnosis of cardiovascular pathologies." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCD017/document.

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Les maladies cardio-vasculaires liées à l'athérosclérose sont pourvoyeuses d’une importante morbi-mortalité dans les pays développés. Une détection plus précoce des modifications des parois vasculaires, via des techniques de diagnostic non invasives, pourrait sensiblement améliorer leur prise en charge. L'échographie est largement utilisée comme outil de dépistage des maladies cardiovasculaires. Cependant, sa faible sensibilité limite son utilisation. Le développement d’agent de contraste spécifique permettant de résoudre ce problème semble donc primordial. Le fucoidane est un ligand polysacch

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9

Kantzon, David. "PFC-design for frequency converter." Thesis, Linköpings universitet, Fysik och elektroteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-124547.

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This thesis deals with power factor correction for three-phase systems. A boost-buck topology was described, modeled and then simulated in MATLAB/Simulink. The simulation results show that the system provides a power factor over 99% over the tested power output range. Moreover, the harmonic injection concept was introduced which reduces the total harmonic distortion to 8.72% at full output power. A prototype system was also built using an FPGA for the control system. The prototype did not provide the performance seen in simulation but showed that the method is valid and does provide a higher p

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10

Bignold, Simon M. "Optimisation of the PFC functional." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/80984/.

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In this thesis we develop and analyse gradient-fl ow type algorithms for minimising the Phase Field Crystal (PFC) functional. The PFC model was introduced by Elder et al [EKHG02] as a simple method for crystal simulation over long time-scales. The PFC model has been used to simulate many physical phenomena including liquid-solid transitions, grain boundaries, dislocations and stacking faults and is an area of active physics and numerical analysis research. We consider three continuous gradient fl ows for the PFC functional, the L2-, H-1- and H2-gradient fl ows. The H-1-gradient flow, known as

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11

Kirchner, Marie-Therese [Verfasser], Florian [Akademischer Betreuer] Pfab, and Johannes [Akademischer Betreuer] Ring. "Akupunktur im Vergleich zu Antihistaminika bei experimentellem Juckreiz bei Patienten mit atopischem Ekzem / Marie-Therese Kirchner. Gutachter: Florian Pfab ; Johannes Ring. Betreuer: Florian Pfab." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1047440660/34.

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12

Kirchner, Marie-Therese Verfasser], Florian [Akademischer Betreuer] Pfab, and Johannes [Akademischer Betreuer] [Ring. "Akupunktur im Vergleich zu Antihistaminika bei experimentellem Juckreiz bei Patienten mit atopischem Ekzem / Marie-Therese Kirchner. Gutachter: Florian Pfab ; Johannes Ring. Betreuer: Florian Pfab." München : Universitätsbibliothek der TU München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20131030-1131492-0-9.

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13

Miller, Daniel [Verfasser]. "Optimierung einer eingangsgleichrichterlosen Leistungsfaktorkorrekturschaltung (PFC) / Daniel Miller." München : Verlag Dr. Hut, 2018. http://d-nb.info/1156510481/34.

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14

Schiff, Albrecht Johannes. "Optimised PFC circuits for efficient power conversion." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611141.

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15

Matejov, Michal. "Pasivní PFC filtry pro spínané napájecí zdroje." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217598.

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This work deals with theory of switched power sources. There is description of the ways for connection and their practice purposes. In the next parts there are defined requirements on input supply circuit for these sources, especially for the form of output current. There are mentioned the basic connecting methods of PFC circuits and these methods modify the output current to meet the requirements of specification ČSN EN 61000- 3- 2. In the next parts there are shown simulations of PFC circuits made by Pspice application. Further is the basic description of sources construction for the sources

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16

Knorst, Tarcísio. "Aplicação da tecnologia PFCP integrada ao CAPP em ambiente de ferramentaria /." Florianópolis, SC, 1998. http://repositorio.ufsc.br/xmlui/handle/123456789/77889.

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Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico.<br>Made available in DSpace on 2012-10-17T08:25:54Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-09T00:50:07Z : No. of bitstreams: 1 147126.pdf: 3809383 bytes, checksum: 1407a1efec58ec3840c76547782764cb (MD5)

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17

Livingstone, Phil. "Nicotinic modulation of dopaminergic signalling in the PFC." Thesis, University of Bath, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528111.

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18

Sartori, Hamiltom Confortin. "Uma nova metodologia de projeto para otimização do volume do converosr boost PFC." Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/8466.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>This work investigates the influence of operation point (Δi @ fs) in the final volume of PFC boost converter. The boost inductor, EMI filter and thermal heatsink are the elements which main influences in the converter volume. These elements are strongly influenced by the chosen operation point, showing a direct relationship among them. With the increase of switch frequency and of the input current ripple occurs reduction of the boost inductor volume. On the other hand, it increases the switching losses in semiconductors, and infl

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19

Douix, Suzie. "Caractérisation de perfluorocarbones (CₓFᵧ, PFCs) par spectrométrie de masse et spectroscopie VUV". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS523/document.

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Les composés perfluorés possèdent des propriétés à la fois hydrophobes et lipophobes et sont commercialisés depuis les années 1950. Ils ont été depuis largement utilisés dans de nombreuses applications industrielles. Cependant, il s’agit de composés persistants, bioaccumulatifs, avec de grandes durées de vie atmosphérique. Ces espèces sont considérées comme de puissants gaz à effet de serre, et seraient principalement dégradées par photolyse, dans la haute atmosphère. Un travail de caractérisation physicochimique de deux composés perfluorés, le PFOA et le PFOS, produits de dégradation ultime d

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20

Zhou, Bo. "CCM Totem Pole Bridgeless PFC with Ultra Fast IGBT." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/51120.

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The totem pole PFC suffers from the Mosfet body diode reverse recovery issue which limits this topology adopted in the CCM high power condition. As the ultra-fast IGBT which is capable of providing 100 kHz switching frequency is available in the market, it is possible to apply the totem pole PFC in CCM high power condition. The thesis provides a method by implementing the ultra-fast IGBT and SiC diode to replace the MOSFET in this topology. To verify the method, a universal CCM totem pole PFC is designed and tested. The design adopts the ADP1048 programmable digital PFC controller by adding ex

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21

Schwanz, Thiago Guilherme. "RESÍDUOS DE PESTICIDAS E COMPOSTOS PERFLUORADOS EM ÁGUAS: AVALIAÇÃO DA EXPOSIÇÃO DA POPULAÇÃO ATRÁVES DO CONSUMO." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/3412.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Contamination of water resources has been caused great impact to the environment. The water constitutes the greatest source of food, and its value for health is incalculable. Despite this, the presence of contaminants in water for consumption in Brazil is a topic with few researches and sources of information. The main contamination of drinking water takes place directly by man, by the abusive use of pesticides or environmental contaminants, with high bioaccumulation potential in the environment, such as perfluorinated and organoch

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22

Lange, André De Bastiani. "Retificador PFC monofásico PWM bridgeless três-níveis de alto desempenho." Florianópolis, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/100858.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica<br>Made available in DSpace on 2013-06-25T23:20:04Z (GMT). No. of bitstreams: 1 307896.pdf: 8014354 bytes, checksum: e7f5c5f26cf0e245f5bbdc82d9fe7865 (MD5)<br>Este trabalho apresenta uma nova topologia de retificador monofásico com fator de potência e rendimento elevados, com o objetivo de adaptar-se aos requisitos de sistemas de conversão modernos. O conversor se caracteriza por integrar as etapas de retificação e conversão CC-CC em um único estágio e por opera

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23

Koh, Hyunsoo. "Modeling and Control of Single Switch Bridgeless SEPIC PFC Converter." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/34125.

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Due to increasing concerns on the power quality, power factor correction (PFC) has become an important issue in light-emitting diode (LED) lighting applications. A boost converter is one of the most well-known PFC topologies, due to its simple circuitry, simple control scheme and small number of passive components. Even though a boost converter is recognized as a typical PFC converter, its output voltage must be higher than its input voltage. This feature is disadvantageous because the device requires an additional buck-stage for LED lighting systems. As an alternative to the boost convert

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24

Pfab, Thiemo [Verfasser]. "Genetische und epigenetische Risikofaktoren für kardiovaskuläre Erkrankungen bei Schwangeren und ihren Kindern / Thiemo Pfab." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2009. http://d-nb.info/1023783533/34.

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25

El, Maiss Janwa. "Conception des matériaux à faible énergie de surface : une nouvelle étape pour la production durable." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4073.

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Les matériaux à faible énergie de surface (LSEMs) sont conçus pour différentes applications. Parmi celle-ci, les applications sur un support solide pour l’élaboration de surfaces superhydro/oléophobes ainsi qu’à l'interface de 2 milieux distincts pour la synthèse de nouveaux tensioactifs éco-responsables. Actuellement, ces matériaux sont constitués essentiellement de composés fluorés pour leurs propriétés uniques leur conférant à la fois l’hydro- et oléo-phobie ainsi que pour leur stabilité thermique et chimique dans des milieux corrosifs. Ce projet montre que l’élaboration des surfaces superh

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26

Miko, Radoslav. "Třífázový síťový napaječ s aktivním usměrňovačem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242035.

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Diploma thesis deals with problems of power factor correction and total harmonic distortion of line current in three phase industrial power supplies. It focuses mainly on using of single phase active PFC topologies based on the principle of step up converter, which are applicable to three phase systems. Verification of operation and comparison of parameters of several circuits was done by simulation in program Matlab Simulink. Then for selected circuit of active PFC was done complete design. The result is a prototype of single phase active PFC circuit with an output power 2 kW for input voltag

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27

AlShehab, Ali Saeed. "Development and analysis of high-frequency, high-density PFC power conversion." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/106076.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.<br>Cataloged from PDF version of thesis. "September 2015."<br>Includes bibliographical references (pages 83-85).<br>This thesis explores the design of power converters that deliver isolated low-voltage dc output (~24V) and operate from "universal" ac input voltage (85 - 264 Vac RMS). It is important that these converters have good overall efficiency (~90-95%), and good ac line power factor (>0.9, and ideally >0.95) to better utilize the available energy. This thesis looks in

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28

Mallet, Géraldine-Mary. "La liaison en français : descriptions et analyses dans le corpus PFC." Paris 10, 2008. http://www.theses.fr/2008PA100172.

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La liaison en français est un phénomène qui s’étend sur différents niveaux d’analyse et qui, pour cette raison, est problématique. La première partie de cette thèse s’attache à décrire ces différentes dimensions impliquées dans le processus (phonologique, morpho-syntaxique, sociolinguistique, lexicale), pour montrer en quoi cette diversité est constitutive du phénomène et qu’on ne peut pas réduire la liaison à une dimension particulière. Dans la seconde partie, nous nous appuyons sur une étude empirique fondée sur une utilisation de la base PFC (Phonologie du Français Contemporain). Cette part

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29

Huang, Weixing. "Design of a Radial Mode Piezoelectric Transformer for a Charge Pump Electronic Ballast with High Power Factor and Zero Voltage Switching." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31818.

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In a conventional electronic ballast for a fluorescent lamp, inductor-capacitor-transformer tank circuit is used. A Piezoelectric Transformer (PT) can potentially be used to replace such a tank circuit to save space and cost. In the past, ballast design using a PT requires selecting a PT from available samples which are normally not matched to specific application and therefore resulting in poor performance. In this thesis, a design procedure was proposed for designing a PT tailored for a 120-V 32-W electronic ballast with high power factor, high efficiency and Zero-Voltage-Switching (ZVS) of

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30

Sang, Tingting. "Integrated Electro-thermal Design Methodology in Distributed Power Systems (DPS)." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9678.

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Although suitable CAD tools for thermal and electrical analyses in power electronic systems are available, traditional stand-alone simulation method seldom takes into consideration of the inter-dependency of semiconductor device power loss and junction temperature in an iterative process. However these dependencies are important, especially for applications where both cooling and power losses are driven by complex mechanisms. For a power supply system, a dynamic design process is necessary to address both electrical and thermal issues. It is because the steady state temperatures of the system

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31

Pfob, Christian Helmut [Verfasser]. "3D Dosimetrie mit PET und SPECT im Vergleich zu konventioneller 2D Dosimetrie / Christian Helmut Pfob." München : Verlag Dr. Hut, 2018. http://d-nb.info/1162767170/34.

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32

Goosey, Emma Rae. "Towards understanding the fate of perfluoroalkyl compounds (PFCs) within urban environments : implications for human exposure." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1052/.

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Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) have been detected across the globe in a variety of media. The toxicity of these compounds and other precursors has led to concern about human exposure. The purpose of this thesis is to investigate 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 (PFHxS), was chosen along with precursors to PF

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Kunacheva, Chinagarn. "Study on Contamination of Perfluorinated Compounds (PFCs) in Water Environment and Industrial Wastewater in Thailand." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/85390.

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PFCs are used in a wide variety of industrial and commercial applications for more than 50 years. Among variation of PFCs, Perfluorooctane sulfonate (PFOS) (CF3(CF2)7SO3-) and perfluorooctanoic acid (PFOA) (CF3(CF2)6COO-) are the most dominant PFCs. In May 2009, PFOS, its salts and perfluorooctane sulfonyl fluoride (PFOSF) are designated as new Persistent Organic Compounds (POPs) which are resistant, bio-accumulating, and having potential of causing adverse effects to humans and environment (IISD, 2009). However, products containing PFCs are still being manufactured and used, which could be th

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SENEVIRATHNA, SENEVIRATHNA THENNAKOON MUDIYANSELAGE LALANTHA DHARSHANA. "Development of Effective Removal Methods of PFCs (Perfluorinated Compounds) in Water by Adsorption and Coagulation." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/126798.

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Plakke, Anderson Bethany Joy. "Auditory working memory: contributions of lateral prefrontal cortex and acetylcholine in non-human primates." Diss., University of Iowa, 2010. https://ir.uiowa.edu/etd/1060.

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Traditionally, working memory and its neural underpinnings have been studied in the visual domain. A rich and diverse amount of research has investigated the lateral prefrontal cortex (lPFC) as a primary area for visual working memory, while another line of research has found the neurotransmitter acetylcholine (ACh) to be involved. This dissertation used auditory cues and found similar patterns of activity for processing auditory working memory information within a task compared to visual working memory processes. The first two experimental chapters demonstrated that the cholinergic system is

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36

Grote, Tobias [Verfasser]. "Digital control for interleaved boost power factor correction (PFC) rectifiers / Tobias Grote." Paderborn : Universitätsbibliothek, 2014. http://d-nb.info/105184813X/34.

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37

Lin, Cheng-Pin, and 林正斌. "Comparison Between Dual Phase Interleaved PFC Converter and ZCS PFC Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/rnp27c.

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碩士<br>崑山科技大學<br>電子工程研究所<br>96<br>In This thesis, we study and implement a 300W BCM (Boundary Current Mode) dual-phase interleave PFC (Power Factor correction) circuit and a 300W active PFC circuit with ZCS (Zero Current Switching)。 At first, we describe the operation and topology difference between these circuits, then design and implement both of these practical PFC circuits for performance comparison. Finally, the results of comparisons are presented. According to comparisons of switching waveforms, power factors and other relative experiment results, the BCM interleaved PFC and ZCS PFC are

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38

Shen, Chuan-Hsing, and 沈俊興. "PFC: Packet Filter Cache." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/92813635078526655899.

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碩士<br>元智大學<br>資訊工程學系<br>92<br>As communication technology advances, network capacity grows exponentially in recent years. The performance of network monitoring tools is getting more critical as they must process much lager number of packets in a unit of time than ever before. A common core component in any network monitoring tools is a packet filter which processes every packet header and passes those packets matching some filter rules to user spaces for further processing. Previous work on packet filters make an effort to investigate flexible and extensible filter abstractions but sacrifice p

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39

Yang, Chin-chi, and 楊清吉. "Realization and Comparison for a Single-stage Flyback PFC and a Single-stage SEPIC PFC." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/45293180514036399879.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>97<br>The rapid advancements in new materials and manufacturing technologies have facilitated the use of high-luminance LEDs for lighting applications, and they have efficacies (lm/W) above those of incandescent lamp, which are growing to fluorescent efficacy levels. Compared with fluorescent lamps, LED lamps have numerous advantages, such as up to 100,000 hours of operation life, a wide range of temperature operation for -20�aC to 120�aC, and their ability to work with low and safe voltages. In general lighting applications, a single-stage discontinuous current cond

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40

McConkey, Clare Elizabeth. "Per- and Polyfluorinated Compounds in Blood and their Impact on Respiratory Problems in Young Children in Winnipeg, Manitoba." 2013. http://hdl.handle.net/1993/14919.

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Per- and polyfluorinated compounds (PFCs) are known to be toxic, bioaccumulative, and persistent. However, exposure routes and toxic effects in humans are still widely unknown. The concentrations of 17 PFCs were measured in newborn cord blood plasma and plasma from pre- and postnatal women from Winnipeg, Manitoba using online solid phase extraction coupled with liquid chromatography mass spectrometry. Median concentrations (with standard deviation) were 2.2 ng/mL (1.8 ng/mL) for perfluorooctanesulfonic acid (PFOS) and 0.89 ng/mL (0.75 ng/mL) for perfluorooctanoic acid (PFOA) in prenatal matern

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Lin, Jia-Yi, and 林佳儀. "PFC Rectifiers Based Bridgeless Boost Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/69808943006936706932.

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碩士<br>國立交通大學<br>機械工程系所<br>101<br>This paper presents the AC to DC Power Factor Correction converter with boost topology, using average current mode in fixed 200kHz switching frequency, and using microcontroller TMS320F28035 to control the PWM duty ratio in continuous conduction mode to re-shape the input current waveform and in phase with the input voltage. Typically, the PFC stage is a bridge rectifier followed by a boost circuit. However, the current distortion and power losses in the diode bridge cannot be ignored, so the conventional PFC topology is replaced by bridgeless PFC topology. Thi

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Tsai, Chien-Li, and 蔡建利. "A Passive PFC Converter with ZCS." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/229sfd.

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碩士<br>國立臺北科技大學<br>電機工程系研究所<br>96<br>The PFC (Power Factor Correction) circuit is widely used in various power supplies so as to reduce the corresponding harmonic distortion and to increase power factor. Up to now, the environment protection and the energy saving are getting more and more attractive in the world. Consequently, improvement in the overall efficiency of the power supply is indispensable, and hence enhancement of the efficiency of the PFC circuit is an important research topic. Consequently, a passive ZCS (Zero Current Switching) PFC circuit topology is presented herein, which

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Wang, Chien-Hung, and 王健鴻. "Digital Control for Cuk PFC Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/85361477657003231723.

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碩士<br>國立交通大學<br>電機學院電機與控制學程<br>104<br>This thesis presents Cuk converter and its digital control method to achieve the power factor correction (PFC) function. Compared to the common dual- loop-control method, this thesis focuses on the new control mode to meet IEC61000-3-2 harmonic standard. This context is adopted from Texas Instruments C2000 series TMS320F28335 , of which DSP chip is to be controlled by the entire circuit. This DSP is categorized into TMS320F28X series, which has floating-point capabilities. Compared to the fixed-point DSP, it has not only more accuracy arithmetic function

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Chen, Ying-Chin, and 陳英欽. "Distribution and fate of perfluorinated compounds (PFCs) in wetland environment." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/39370317113748580487.

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博士<br>國立臺灣大學<br>環境工程學研究所<br>100<br>Removals of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in pilot-scale field and sorption of PFOA and PFOS onto five types of soils were investigated in this study. Phytoextraction by four aquatic plants (Hygrophila pogonocalyx Hayata, Ipomoea aquatic Forssk, Ludwigia (x) taiwanensis and Eleocharis dulcis) and sorption onto soil were determined. Both PFOA and PFOS were fairly phytoextracted by four aquatic plants; the uptake capacity was found in the following order: Hygrophila pogonocalyx Hayata > Ipomoea aquatic Forssk ≈ Ludwigia (x)

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HIEU, PHAM PHU, and PHAM PHU HIEU. "Digital Control Strategy for Boost PFC Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/27729671064086308862.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>103<br>Power factor correction (PFC) shapes the input current to minimize the reactive power drawing from the mains. The use of PFC circuits is widely discussed and considered for most off-line power supplies. For high power applications, boost PFC converter operated in continuous conduction mode is usually employed and controlled by analog ICs such as UC3854. However, when the converter operates at lower power range, discontinuous conduction mode will appear during parts of line period, causing input current distortion. Moreover, the input EMI filter causes the sign

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Liu, Jyun-Lin, and 劉俊麟. "A PFC Buck Rectifier with THD Improved." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/smhh9b.

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碩士<br>國立臺北科技大學<br>電機工程系<br>106<br>A buck PFC rectifier with THD improved is developed herein. This converter operates in the discontinuous conduction mode (DCM) ,which makes the control easy. In addition, the diode has zero current turn-off such that there is no problem in reverse recovery current. Via output voltage sampling and voltage-follower control, a desired control force is created to drive the main power switch. By doing so, not only the output voltage is kept constant at a given value, but also the zero current region before and after the zero crossing point of the input current can

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"Aplicação da Tecnologia Pfcp Integrada ao Capp em Ambiente de Ferramentaria." Tese, Programa de Pós Graduação em Engenharia de Produção, 1998. http://www.eps.ufsc.br/disserta98/knorst/index.html.

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Yang, Ya-Ting, and 楊雅婷. "Material Flow Analysis of PFCs for the Manufacturing Industry in Taiwan." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/12121288731490857784.

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碩士<br>國立臺北大學<br>自然資源與環境管理研究所<br>96<br>In recent years, the influence of global warming has become much more serious than before. The topic of the reduction of greenhouse gases has been taken seriously through the world. In order to alleviate the global warming phenomenon effectively, the Kyoto Protocol which was adopted in Dec 1997 had made a consensus to lower overall emissions of six greenhouse gases- CO2, CH4, N2O, HFCs, PFCs and SF6. Comparing with the CO2 from traditional industries, the Per Fluorinated compounds (PFCs) from manufacturing industries have greater Global Warming Potential (

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Chen, Arvin, and 陳憲宏. "A Study PFCs Emission Reduction at PECVD tools Use Etching Gas." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/18092023145165856342.

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碩士<br>明新科技大學<br>化學工程研究所<br>99<br>The optimized cleaning procedure is noticed by Semiconductor manufacturing in recent years. Semiconductor company A is successfully using C4F8 cleaning gas in Plasma Enhanced Chemical Vapor Deposition system (PECVD) . The cleaning gas, C4F8 , is also discussed and applied on CVD system in may articles. It is successfully demonstrated and resulted in reducing pollution to the environment. Semiconductor manufacture must comply the overall Carbon reduction of tax and provide a low cost solution to achieve Perfluoro-compounds (PFCs) against Carbon reduction. Thus,

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Kuan-HsienChou and 周冠賢. "Design and Implementation of a Control IC forInterleaved BCM Boost PFCs." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/73170789178915553193.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>100<br>In this thesis, a novel interleaved BCM boost PFC control IC is designed and implemented. This contoller not only retains the advantage of low swtiching loss of BCM control but also increases the power rating of converter. The voltage mode master-slave interleaved control with turn-on instant phase-shift is adopted in the proposed controller. Conventionally, the interleaved BCM control scheme may occasionally operate in CCM due to pertubations. To solve this problem, the thesis proposes a novel phase-shifter to generate phase-shift signal. And the second ze

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