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Dissertations / Theses on the topic 'Voltage ratios'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Dupuis, Sebastien. "Influence des ratios de co-expression précis Cx43 : Cx45 sur la formation des canaux de jonction et leurs propriétés électriques." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0375/document.

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Les canaux de jonctions (CJ) composés des connexines (Cxs) assurent la communication intercellulaire directe qui par leur propriétés électriques régulent la propagation du potentiel d’action (PA) cardiaque. Dans les myocytes ventriculaires Cx43 et Cx45 exprimées à des niveaux et ratios physiopathologiques variables assurent cette fonction. Cette étude détermine la contribution de Cx43 et Cx45 dans la formation des CJ et leurs propriétés électriques. La lignée cellulaire épithéliale de foie de rat exprimant la Cx43 endogène et transfectée de manière stable pour exprimer des ratios Cx43:Cx45 pré

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Kolařík, Robin. "Analýza energetických toků v obci do 3 000 obyvatel a vysokou úrovní penetrace střešních FV instalací." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442542.

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This diploma thesis is focused on the issue of connecting new sources to the distribution system and their subsequent operation in the network. The theoretical part describes the conditions of connection and operation of resources in the network according to the established rules. In the practical part, a number of photovoltaic sources and battery vehicles are implemented into the current system according to selected scenarios. Subsequently, the daily course of power flow and voltage conditions in the network is calculated.

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Thomas, Stephan [Verfasser]. "A Medium-Voltage Multi-Level DC/DC Converter with High Voltage Transformation Ratio / Stephan Thomas." Aachen : Shaker, 2014. http://d-nb.info/1049383176/34.

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4

Theed, Justin Edward. "Environmental parameter for cable ratings." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287344.

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5

Jonsson, Erik. "Load Current Interruption in Air for Medium Voltage Ratings." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24327.

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Load break switches (LBSs) are common inside metal clad switchgear assemblies where space is a limiting factor. SF6 is usually used in this application due to its superior electrical characteristics, but is unfortunately also a strong greenhouse gas. Therefore development of new products, utilizing air which is an environmental friendly alternative, is in progress. Since air has much lower dielectric strength than SF6, the main challenge with this is therefore to reduce the size. Compact SF6 products have created a retrofit market, and in many existing installation sites larger products will n

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Bilgili, Hulusi Birol. "Pressure, Gas Ratio And Operation Voltage Optimization Of A Helium-neon Laser." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12605917/index.pdf.

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Aim of this thesis is to investigate the optimum working parameters of a helium-neon laser. Partial pressure ratios, total pressures of the gases and voltage-current characteristics were studied. The analysis of the results includes the minor factors (impurity, volume, etc.) and their effects to main parameters (laser power, voltage, current). Tables, which were formed by measured optical parameters as wavelength and power, converted to graphs and from these graphs optimal working conditions for the laser are obtained.

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7

Huang, Ziyi. "Rating methodology of high voltage mass impregnated DC cable circuits." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/372744/.

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With the continuing growth in energy consumption worldwide, the move towards a European wide super grid will result in significant changes in how modern transmission and distribution networks are operated. Fundamental to this is the need to accurately know or determine the available ampacity of high voltage cable circuits, because huge bulk power volumes need to be transmitted between maritime nations through dc power cables. Therefore, an accurate cable rating becomes paramount towards an efficient and safe operation of transmission networks, while the finance for large scale network construc

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Xu, Jing. "Technology for Planar Power Semiconductor Devices Package with Improved Voltage Rating." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26373.

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The high-voltage SiC power semiconductor devices have been developed in recent years. They cause an urgent in the need for the power semiconductor packaging to have not only low interconnect resistance, less noise, less parasitic oscillations, improved reliability, and better thermal management, but also High-Voltage (HV) blocking capability. The existing power semiconductor packaging technologies includes wire-bonding interconnect, press pack, flip-chip technology, metal posts interconnected parallel plates structure (MIPPS), dimple array interconnection (DAI), power overlay (POL) technolo

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9

Radić, Aleksandar. "Comparative analysis of high input voltage and high voltage conversion ratio step-down converters equipped with silicon carbide and ultrafast silicon diodes." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/861.

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DC to DC step-down applications with high input voltage and high voltage conversion ratio operational requirements, such as photovoltaic battery chargers, are subject to high conduction losses, high switching losses and substantial reverse-recovery losses when minority carrier principle diodes are used. The recent introduction of silicon carbide diodes with high breakdown voltages has made possible the elimination of reverse-recovery losses at high voltage levels and as such has sparked interest in their use due to the potential efficiency improvements. This report presents the results of

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Dantas, Bruna Priscilla Vasconcelos. "Participação dos canaisTRP nos efeitos cardiovasculares induzidos por carvacrol em ratos." Universidade Federal da Paraíba, 2010. http://tede.biblioteca.ufpb.br:8080/handle/tede/6854.

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Made available in DSpace on 2015-05-14T13:00:13Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2275378 bytes, checksum: fcb4196c739d83997818dc074daf738f (MD5) Previous issue date: 2010-03-11<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The pharmacological effects of carvacrol, a monoterpenoid phenol, on the cardiovascular system were studied in normotensive rats, using in vivo and in vitro techniques. In superior mesenteric artery rings isolated from rats with functional endothelium carvacrol (10-8 - 3 ₓ 10-4 M) concentration-dependently relaxed phenylephrine-i

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Dantas, Bruna Priscilla Vasconcelos. "O carvacrol reduz a pressão arterial via ativação de canais receptores de potencial transiente em ratos espontaneamente hipertensos." Universidade Federal da Paraíba, 2014. http://tede.biblioteca.ufpb.br:8080/handle/tede/8055.

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Submitted by Clebson Anjos (clebson.leandro54@gmail.com) on 2016-03-29T17:44:52Z No. of bitstreams: 1 arquivototal.pdf: 1922192 bytes, checksum: 6f50e098ac1e02adb9b434bdbc12154e (MD5)<br>Made available in DSpace on 2016-03-29T17:44:52Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1922192 bytes, checksum: 6f50e098ac1e02adb9b434bdbc12154e (MD5) Previous issue date: 2014-08-25<br>Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>TRP channels have been extensively studied in many physiolo

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Rampazo, Érika Patrícia Silva [UNIFESP]. "Corrente elétrica de alta voltagem na cicatrização de ruptura parcial do tendão do calcâneo em ratos." Universidade Federal de São Paulo (UNIFESP), 2013. http://repositorio.unifesp.br/handle/11600/23074.

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Made available in DSpace on 2015-12-06T23:46:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2013<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq<br>Introdução: A alta incidencia das lesoes tendineas e a dificuldade do reparo tecidual tornam relevante o estudo de agentes eletrofisicos como a corrente eletrica de alta voltagem na cicatrizacao do tendao. Objetivo: Verificar a eficacia da corrente eletrica de alta voltagem na cicatrizacao de ruptura parcial do tendao do calcaneo em ratos. Metodos: Quarenta ratos machos da linhagem Wistar foram distribuidos ao acaso

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Genaro, Janaina Ticiane 1987. "Estimulação com corrente pulsada de alta voltagem na cicatrização de áreas cruentas : modelo experimental com ratos Wistar." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/311639.

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Orientador: Paulo Kharmandayan<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas<br>Made available in DSpace on 2018-08-23T03:56:12Z (GMT). No. of bitstreams: 1 Genaro_JanainaTiciane_M.pdf: 8171696 bytes, checksum: 16d52210523a235659ae70d942e6e1a1 (MD5) Previous issue date: 2013<br>Resumo: A reparação tecidual é de grande interesse para os profissionais da área da saúde. Sua eficiência acelera o processo de reabilitação, o retorno ao trabalho, atividades de lazer e até ao convívio social. Existem evidências de que a estimulação elétrica de alta volt

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Souza, Ana Karina de. "Efeito da estimulação elétrica de alta voltagem na integração de enxertos de pele total em ratos submetidos à ação da nicotina." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/17/17152/tde-29032018-095623/.

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O procedimento cirúrgico de transplante de pele ou enxertia tem grande utilização em cirurgia plástica reparadora, e a influência de recursos terapêuticos na viabilidade deste, sob a ação da nicotina, ainda não está fundamentada. O objetivo do estudo foi avaliar a influência da estimulação elétrica de alta voltagem (EEAV) na integração de enxerto de pele total em ratos submetidos à ação da nicotina. Para tanto, foram analisados 60 ratos machos, adultos, da linhagem Wistar distribuídos aleatoriamente em 6 grupos de 10 animais: Grupo 1 (Sham) - animais submetidos ao procedimento cirúrgico de enx

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15

Zhang, Hongling. "Sigma Receptors Modulation of Voltage-gated Ion Channels in Rat Autonomic Neurons." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001183.

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Stocker, Patrick J. "Sialic Acid Modulation of Cardiac Voltage-Gated Sodium Channel Gating Throughout the Developing Myocardium." [Tampa, Fla] : University of South Florida, 2005. http://purl.fcla.edu/usf/dc/et/SFE0001304.

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Nascimento, Monica Andressa Wessner do. "Canais de cálcio e de potássio dependentes da voltagem como alvos de respostas rápidas ao retinol e à testosterona em testículo de ratos imaturos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/185043.

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A regulação do processo de maturação e manutenção do metabolismo das células de Sertoli é fundamental para a promoção adequada da fertilidade masculina. Além dos hormônios andrógenos, com a testosterona (T), os retinóides possuem papel fundamental na regulação e manutenção da espermatogênese. Sabe-se que além dos efeitos individuais, os retinóides interagem com outros hormônios, modulando suas ações. Este trabalho teve como objetivos estudar as possíveis interações nas vias de sinalização do retinol e da T em rápidas respostas mediadas pela membrana plasmática, verificando a influência destes

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18

Kanzler, Katja. "The Politics of Imaging the "Machine in the Garden" in Antebellum Factory Literature." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-213491.

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This essay brings a fundamentally Americanist question to bear on Leo Marx’s fundamental piece of Americanist scholarship: What cultural work does the machine-in-the-garden trope perform in literary texts, texts that—as Marx highlighted—emphatically invoke the socio-economic upheavals of industrialization? Rather than asking what the trope means, I am interested in what it does in textual environments that, literally or metaphorically, navigate a protean discourse of class.1 I want to pursue this question in a reading of two texts that directly engage with industrialization and its machinery,

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Vijayaragavan, Krishna Prasad. "Feasibility of DC microgrids for rural electrification." Thesis, Högskolan Dalarna, Energiteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:du-25850.

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DC system and DC microgrids are gaining popularity in recent times. This thesis suggests a method to state the workability of a DC based PV system using the softwares Simulink, PVsyst and HOMER. The aims of this project include suggesting a DC based architecture, finding out the performance ratio and a cost analysis. The advantages of the DC based system, the cost benefits associated with it and its performance will determine its feasibility. Not many softwares have the functionality to simulate DC based PV systems. PVsyst is considered as one of the most sought-out softwares for the simulat

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20

Neveu, Dorine. "Diversité, régulations et modulation phénotypique des canaux calciques activés par le voltage dans les myocytes aortiques de rat adulte, en culture." Montpellier 1, 1993. http://www.theses.fr/1993MON1T010.

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21

Ahmad, Saad. "Modeling the Discharge Loading of Radio Frequency Excited CO2 Slab lasers." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/1081.

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"RF excited CO2 lasers are widely used in industry. They provide relatively high power discharge levels while maintaining compactness, simplicity, and durability with respect to other competing laser technologies. To attain high power levels in the range of 5-10 KW, lasers with large electrode areas have to be designed. Unfortunately, due to the large electrode length requirements, transmission line effects make the discharge loading nonlinear, adversely affecting the efficiency of the CO2 laser. A standard approach to linearize the discharge loading is to introduce shunt inductors across the

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22

WANG, YAWEI. "High Performance Synchronous Reluctance Machines: Design and Applications." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3425753.

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As one of the oldest machine topologies, the concept of synchronous reluctance (REL) machine can be traced back as early as 1900s. In the last 20 years, particularly, the REL machines have attracted more and more attention in both academic and industrial fields. Without permanent magnets and rotor bars, the rotor construction of the REL machine is more robust than either permanent magnet (PM) machines or induction machines (IMs). In addition, it achieves the merits of low cost, low maintenance, and high reliability. All these features reveal the REL machine to be an attractive alternative to t

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Kanzler, Katja. "The Politics of Imaging the "Machine in the Garden" in Antebellum Factory Literature." Campus Verlag, 2014. https://tud.qucosa.de/id/qucosa%3A29939.

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This essay brings a fundamentally Americanist question to bear on Leo Marx’s fundamental piece of Americanist scholarship: What cultural work does the machine-in-the-garden trope perform in literary texts, texts that—as Marx highlighted—emphatically invoke the socio-economic upheavals of industrialization? Rather than asking what the trope means, I am interested in what it does in textual environments that, literally or metaphorically, navigate a protean discourse of class.1 I want to pursue this question in a reading of two texts that directly engage with industrialization and its machinery,

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24

Ghasemi, Negareh. "Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.

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The ability of a piezoelectric transducer in energy conversion is rapidly expanding in several applications. Some of the industrial applications for which a high power ultrasound transducer can be used are surface cleaning, water treatment, plastic welding and food sterilization. Also, a high power ultrasound transducer plays a great role in biomedical applications such as diagnostic and therapeutic applications. An ultrasound transducer is usually applied to convert electrical energy to mechanical energy and vice versa. In some high power ultrasound system, ultrasound transducers are applied

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Yang, Yi. "Power line sensor networks for enhancing power line reliability and utilization." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41087.

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Over the last several decades, electricity consumption and generation have continually grown. Investment in the Transmission and Distribution (T&D) infrastructure has been minimal and it has become increasingly difficult and expensive to permit and build new power lines. At the same time, a growing increase in the penetration of renewable energy resources is causing an unprecedented level of dynamics on the grid. Consequently, the power grid is congested and under stress. To compound the situation, the utilities do not possess detailed information on the status and operating margins on their

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Finotti, Claudio. "Studies on the impact of the ITER Pulsed Power Supply System on the Pulsed Power Electrical Network." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422958.

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ITER experiment will be built at Cadarache (France) and its main goal will be to prove the viability of fusion as an energy source. In a fusion reactor, the plasma (an ionized gas of Deuterium and Tritium) has to be heated up to temperatures of millions of Celsius degrees in order to sustain the fusion reaction. No materials are able to withstand these temperatures; therefore the plasma is kept away from the walls of the reactor vacuum vessel by means of appropriate magnetic fields, produced by the currents flowing in the superconducting coils, which interact with the charged particles of the

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Shahin, Ahmed Eid Moussa. "Contribution à l’optimisation des structures de conversion DC/DC non isolées." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL045N/document.

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Dans ce mémoire, nous avons étudié les convertisseurs d’interface permettant l’interconnexion d’une source basse tension non linéaire et d’un bus DC moyenne tension. La source choisie, pour l’étude, était une pile à combustible de type PEM. La structure de puissance retenue correspondant à la mise en cascade d’un convertisseur entrelacé en entrée et d’un convertisseur trois niveaux en sortie. Afin de dimensionner au mieux le convertisseur global, nous avons proposé un modèle analytique permettant de connaitre l’ensemble des pertes dans le système en fonction du point de fonctionnement et de se

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Pelteku, Altin E. "Adaptive Suppression of Interfering Signals in Communication Systems." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/138.

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The growth in the number of wireless devices and applications underscores the need for characterizing and mitigating interference induced problems such as distortion and blocking. A typical interference scenario involves the detection of a small amplitude signal of interest (SOI) in the presence of a large amplitude interfering signal; it is desirable to attenuate the interfering signal while preserving the integrity of SOI and an appropriate dynamic range. If the frequency of the interfering signal varies or is unknown, an adaptive notch function must be applied in order to maintain adequate

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Masoud, Khalid Hasan. "Circuits and controls for grid-connected inverters." Thesis, Queensland University of Technology, 2002.

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Shahin, Ahmed Eid Moussa. "Contribution à l’optimisation des structures de conversion DC/DC non isolées." Electronic Thesis or Diss., Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL045N.

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Dans ce mémoire, nous avons étudié les convertisseurs d’interface permettant l’interconnexion d’une source basse tension non linéaire et d’un bus DC moyenne tension. La source choisie, pour l’étude, était une pile à combustible de type PEM. La structure de puissance retenue correspondant à la mise en cascade d’un convertisseur entrelacé en entrée et d’un convertisseur trois niveaux en sortie. Afin de dimensionner au mieux le convertisseur global, nous avons proposé un modèle analytique permettant de connaitre l’ensemble des pertes dans le système en fonction du point de fonctionnement et de se

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Scherer, Lucas Giuliani. "Topologia híbrida e métodos de controle aplicados à regulação de tensão de geradores de indução auto-excitados." Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/3698.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This doctoral thesis deals with the study, analysis and development of a new hybrid topology for voltage regulation of stand-alone microgeneration systems employing self-excited induction generators. The hybrid topology proposed considers a three-phase four-wire system and employs a distribution static synchronous compensator (DSTATCOM) in combination with banks of switchable capacitors (BCC) to perform the regulation of the terminal voltages of the induction generator. As a result of using the proposed topology, it is expected the

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Odehnal, Adam. "Scintilační detektor sekundárních elektronů pro environmentální rastrovací elektronový mikroskop." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242063.

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Thesis deals with theoretical knowledge about scanning electron microscopy and environmental scanning electron microscopy. It describes principle of operation, signals generated by interaction between primary electron beam and specimen and means of detection of secondary electron signal in environmental conditions using scintillation detector. Furthermore, thesis focuses on optimization of detection od secondary electrons by adjusting electrode system of scintillation detector. Computer program Simion is used for modelling signal electron trajectories for proper adjustments. Simulation were st

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Toader, Iulia Genoveva. "Electrical and Morphological Characterisation of Organic Field-Effect Transistors." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-100403.

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In dieser Arbeit wurden unterschiedliche Moleküle aus der Klasse der Phthalocyanine (Pc) und Pentacen-Materialien als aktive Schichten in organischen Feldeffekttransistoren (OFETs) mittels organischer Molekularstrahldeposition (OMBD) unter Hochvakuumbedingungen aufgedampft. Die elektrische Charakterisierung von Top-Kontakt (TC) und Bottom-Kontakt (BC) OFET-Konfigurationen, die Auskunft über die Ladungsträgermobilität, die Schwellspannung und das Ein/Aus-Verhältnis gibt, wurde sowohl unter Hochvakuum- als auch unter Umgebungsbedingungen an Luft durchgeführt. Für beide OFET-Konfigurationen wurde

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Svoboda, Lukáš. "Monitorování dynamických soustav s využitím piezoelektrických senzorů vibrací." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-432742.

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The aim of this diploma thesis is to describe localization and calculation load identification of dynamic systems using piezoelectric sensors. Finding methods, which would allow us to evaluate loads on simple systems is the key to their application in the structural health monitoring of more complex systems. A theory necessary for understanding and application in aerospace, civil engineering, automobile industry, and train traffic of presented methods is given in the first part of the thesis. In these applications, the methods of wave propagation and different types of neural network methods a

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Šimoník, Petr. "Měřič odstupu signálu od šumu obrazových signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217681.

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The diplomma thesis is dealing with possibilities of Signal to noise ratio measurement by method, which is based on direct measurement. It is chosen the most suitable method – signal and noise separation to two different parallel signal branches, where is measured signal strength in one branch and root mean square value in the other. The thesis is consisted of a concept of detail block scheme of Signal to noise ratio meter, which was designed in terms of theoretical knowledge. Particular functional blocks were circuit-designed, the active and passive parts were chosen and their function were d

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Jireček, Martin. "Flíčková anténa s budicí štěrbinou." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219166.

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Systems with extreme bandwidth are part of advanced modern systems at radio high capacitive communication. Originally this technology was intended for radar scan. Thanks to wide frequency band had radar possibility „ see" a behind crimp, e.g. behind woody partitions etc . To his noise immunity, fail safe tapping plus small wattage heftiness began use for datal systŽm function. If is elementary antenna compound from coaxial probe and shorting outlet, it is possible use to actuating separate narrow slot placed in the middle of incandescent dabs. Impedance and radiating characteristics convention

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ALILI, IMER. "L’insegnamento della lingua, letteratura e cultura italiana all’estero: l’esperienza nella Repubblica di Macedonia." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2015. http://hdl.handle.net/2108/189882.

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Teaching italian language, literature and culture abroad: the experience in the Republic of Macedonia (FYROM) by Imer ALILI. // In this dissertation we wanted to summarize, briefly, an empirical and analytical study on the current state of general education and the teaching tools available to teachers of all levels of teaching, to move us forward in the direction of a possible revision and rebuilding the educational system, like the humanistic values of which the various disciplines should be impregnated to comprehend the current conditions of reality evolved in this digital age, now on a glo

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Wang, Liang-Jie, and 王亮傑. "High Voltage Conversion Ratios Cascade Boost Converter With Half-Bridge Driver Integrated Circuit." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/87187787355110534784.

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碩士<br>輔仁大學<br>電機工程學系碩士在職專班<br>104<br>This thesis used to the two DC - DC boost converter architecture: (1) high-voltage conversion ratio cascade boost converter (2) having twice the pressure of the high-gain switching capacitive coupled inductor converter of technology. It contains two stages: the first stages of the input voltage up to twice the mode switched capacitor converters (SCC), the second stages coupled inductor having and diode – capacitor (DC) snubber high gain boost converter.and DC - DC technology using high-gain boost converter. DC - DC boost converter using high-gain boost tech

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Chang, Chin-Jen, and 張志任. "Design of CMOS Integrated Low Voltage Ratio Frequency Mixer." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/65789022857957866415.

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碩士<br>國立中正大學<br>電機工程所<br>98<br>A low voltage technology becomes much more important as the progress of CMOS radio frequency circuit. In this study, some of CMOS mixer designs were based on TSMC 1P6M 0.18-μm CMOS process. Firstly, the Gilbert mixer is modified by the structures of CMOS switch and common mode feedback circuit so as to reduce the operating voltage to 1.2V. This modification achieves a conversion gain 10.8dB. The noise figure becomes 14.5dB. The requirement of local oscillator signal is 0 dBm. The power consumption takes 5.2mW. Next two studies are focused on the improvement of fo

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Cheng, Hao-Wen, and 鄭皓文. "Voltage-Holding-Ratio and Residual-DC-Voltage Characteristics of Twisted-Nematic and Planar-Alignment Liquid-Crystal Cells." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/20193968023445947370.

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碩士<br>國立交通大學<br>光電系統研究所<br>102<br>According to the requirement on the detection of display performance in thin film transistor liquid crystal display (TFTLCD), a multi-functional instrument for the measurement of voltage holding ratio (VHR), residual direct current (RDC), and electro-optical characteristics of liquid crystal cells have been developed by our research group. In order to expand the application field and measurement range for abovementioned parameters, in this study, a simple temperature-control system consisting of heating chips and cooling systems is designed and combined into o

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Cheng, Ching-Hsiang, and 鄭景翔. "Novel Isolated Multi-Phase High Step-Up Voltage Ratio DC Converters." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/83727561076548186122.

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碩士<br>國立清華大學<br>電機工程學系<br>100<br>High step-up voltage ratio DC converters are widely used in a variety of high voltage applications such as the front-end stages of uninterruptible power systems and distributed energy systems. Also, for safety reasons, galvanic isolation is essential. Although one can use high turns ratio transformer and/or coupling inductors to achieve high step-up voltage ratio, however, the resulting high voltage stress and decreased efficiency are the major drawbacks. Hence, in this thesis, a different approach is employed to achieve high step-up voltage ratio without relyi

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Van, der Linde Roelof Johannes. "Analysis and modelling of a low voltage ratio DC-DC converter." Thesis, 2009. http://hdl.handle.net/10210/2184.

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De, Jong Erik Cornelis Wytze. "A comparative study of several low voltage ratio DC-DC converters." Thesis, 2011. http://hdl.handle.net/10210/4088.

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M.Ing.<br>The need for efficient, power dense, high frequency DC-DC converters is becoming more important in applications such as on board voltage regulation modules for low voltage microprocessors as well as the interconnection system of the two parallel DC-busses present in future automobiles. These applications have a few basic criteria in common, namely, that they exhibit a low voltage conversion ratio, demand a high power capability as well as a high power density and have no explicit need for galvanic isolation. For applications that fit this description, a new innovative conversion syst

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邱皇樺. "A Novel Interleaved and Isolated Buck Converter with High Voltage Ratio." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/80326969348144926534.

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碩士<br>明新科技大學<br>電機工程研究所<br>98<br>This paper presents a novel interleaved and isolated DC to DC buck converter with high voltage ratio. The converter consists of a half-bridge converter and a forward converter which are connected in parallel with a common load. As being one of interleaved DC to DC converters, it has smaller output current ripples within wide duty ratio, and it also has isolated input/output parts and higher voltage ratio due to applying transformers. So the converter presented in this paper is an isolated DC to DC buck converter with advantages of wide duty ratio, small output

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Kuo, Chih-Hao, and 郭智豪. "Investigation of Voltage Holding Ratio of Twisted Nematic Liquid Crystal Displays." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/36055247294216225907.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>99<br>Ion concentration is the most important parameter to affect the display qualities of liquid crystal displays. Prior publications on the measurement of ion concentration did not distinguish ions either from high- or low-ionization-rate impurities. In this thesis, for the first time, we have developed theoretical model for the ion generations and transports for HIR (high-ionization-rate) and LIR (low-ionization-rate) impurities within a TN cell. By fitting our experimental result of the measured VHR data to the theoretical model, we have obtained ion concentra

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Lin, Chun-Ju, and 林俊儒. "Single Cell Resistance Measurement by Resistance Ratio to Voltage Conversion Techniques." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4skft9.

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碩士<br>國立交通大學<br>電機工程學系<br>108<br>This thesis utilizes charge resdistribution and Ohm’s law to derive the resistance ratio of single cell to PBS solution. There are two DUTs, PBS solution and single cell, in this constructure. A precharged capacitor releases charge into the two DUTs simultaneously. The currents flowing through the two DUTs charge the two feedback capacitors respectively. This results in two voltages related to the resistance ratio of the two DUTs. Afterwards, the difference of the voltages are transformed into digital code with SAR ADC to let the users calculate the resistance

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Yang, Cheng-Han, and 楊承翰. "Research on the Various Definitions of Voltage unbalance Ratio and Impacts of Voltage unbalance on the System and Equipment." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/14475348210453260845.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>96<br>The main purpose of this thesis is to investigate various definitions of voltage unbalance ratio and impacts of voltage unbalance on system and equipment. The research topics include: comparison of various definitions of voltage unbalance ratio, impacts of three phase unbalanced voltages on the energy consumption and lifetime of three-phase induction motor, the causes of three phase voltages unbalance, and loss assessment of a distribution system due to voltage unbalance. In this thesis, Microsoft Excel�� and GeneHunter�� are two major software tools adopted to

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Li, Zhong-Hua, and 李鍾華. "A Low Startup Voltage High Step Up Ratio EnergyHarvesting Power Conversion System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/27829878453003361357.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>104<br>The conventional PV module is composed of the series chains of PV cells. When the shading effect happens, the whole output efficiency of the PV array will reduce severely, it will even damage the PV array. In this thesis, a new power conversion system using the 0.5V voltage generated from PV cell or other energy harvesting transducer as input is proposed. This power conversion system is implement with TSMC 0.25μm CMOS HV process. Firstly, we use the charge pumps to convert the voltage to higher than 2.6V respectively. Then, a switching inductor boost converte

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Lin, Yi-Cheng, and 林怡成. "Vertical Polymer Transistor with high on/off ratio and low operation voltage." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/02422227718387744700.

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碩士<br>國立交通大學<br>物理研究所<br>97<br>Polymer transistors have been studied extensively due to their applications on low-cost large-area transistor arrays or on flexible electronics. Conventional polymer field-effect transistor (FET) is a horizontal device with source and drain electrodes in the same plane. Low mobility conjugated polymers and long channel length seriously limit the characteristics of polymer FET, and thus polymer FET usually exhibits high operation voltage and low operation frequency. To circumvent these limitations various vertical transistors with short channel length perpendicula

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Liu, Ge Zhi, and 劉格致. "A Novel High Step-Up Voltage Ratio DC converter with Integrated Magnetic." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/75467628595315892139.

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碩士<br>國立清華大學<br>電機工程學系<br>101<br>Due to the energy crisis, global climate change and ruining of environment, a lot of countries around the world are committed to promoting renewable energy and clean energy developing. However, owning to the low output voltage characteristic of fuel cells and solar cells under low sun light, a high step-up converter is often required. In existing literature, capacitor voltage doublers are used to achieve high voltage gain. However, this kind of topology often leads to high cost and low reliability. Hence, the major motivation of this thesis is to propose a nove

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