Dissertations / Theses on the topic 'Digital Pump'
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Rampen, William Hugh Salvin. "The digital displacement hydraulic piston pump." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/12829.
Full textPellegri, Matteo, Matthew Green, Jill Macpherson, Callan McKay, and Niall Caldwell. "Applying a multi-service digital displacement® pump to an excavator to reduce valve losses." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71185.
Full textBurbidge, Martin John. "Simple generic digital-only DfT methodologies applicable for embedded charge-pump based frequency synthesis systems." Thesis, Lancaster University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430016.
Full textMadhusudanan, Jayasurya. "Evaluation of a digitial displacement pump in a load haul dump application." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162594.
Full textFu, Minghua. "Development and evaluation of a robust and intelligent digital control system for a rotary blood pump /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487953204280546.
Full textAl, Sabbagh Mhd Zaher. "0.18um phase/frequency detector and charge pump design for digital video broadcasting for handheld's phase-locked-loop systems." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196281141.
Full textAl, Sabbagh Mhd Zaher. "0.18μm phase/frequency detector and charge pump design for digital video broadcasting for handheld’s phase-locked-loop systems." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281141.
Full textYogesh, Mitesh. "A Self-compensated, Bandwidth Tracking Semi-digital PLL Design in 65nm CMOS Technol-ogy." Thesis, Linköpings universitet, Elektroniksystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-85143.
Full textVyas, Rushi J. "An embedded, wireless-energy-harvesting platform (E-WEHP) for powering sensors using existing, ambient, wireless signals present in the air." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52291.
Full textTerlemez, Bortecene. "Oscillation Control in CMOS Phase-Locked Loops." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4841.
Full textGong, Hua. "3D Printing for Microfluidics." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7690.
Full textMa, Jie. "Human Endogenous Sodium Pump Inhibitors Measurement, Source, Synthesis and Regulation." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2953.
Full textLevi, A. J. "The consequences of inhibiting the sodium/potassium pump in mammalian heart muscle." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381349.
Full textLopes, Bruno Miguel. "Digitally programmable delay-locked-loop with adaptive charge pump current for UWB radar system." Master's thesis, Faculdade de Ciências e Tecnologia, 2010. http://hdl.handle.net/10362/4101.
Full textThe objective of this thesis is to study and design a digitally programmable delay locked loop for a UWB radar sensor in 0.13 m CMOS technology.. Almost all logic systems have a main clock signal in order to provide a common timing reference for all of the components in the system. In certain cases it is necessary to have rising (or falling) edges at precise time instants, different from the ones in the main clock. To create those new timing edges at the appropriate time it is necessary to use delay circuits or delay lines. In the case of the radar system its necessary to generate a clock signal with a variable delay. This delay is relative to the transmit clock signal and is used to determine the target distance. Traditionally, delay lines are realized using a cascade of delay elements and are typically inserted into a delay-locked-loop (DLL) to guaranty that the delay is not affected by process and temperature variations. A DLL works in a similar way to a Phase Locked Loop (PLL). In order to facilitate the operation of the radar system, it is important that the delay value should be digitally programmable. To achieve a digitally programmable delay with a large linearity (independent from matching errors), the architecture of the system is constituted by a digital modulator that controls a 1-bit digital to time converter, whose output will be filtered by the DLL, thus producing the delayed clock signal. The electronic sub-blocks necessary to build this circuit are describe in detail as the proposed architectures. These circuits are implemented using differential clock signals in order to reduce the noise level in the radar system. Design and simulation results of the digitally programmable DLL shows a high output jitter noise for large delays. In order to improve this results a new architecture is proposed. Conventional DLL’s have a predefined charge pump current. The new architecture will make the charge pump current variable. Simulations results will show a improved jitter noise and delay error.
Kärnell, Samuel, Amy Rankka, Alessandro Dell`Amicio, and Liselott Ericson. "Digital pumps in speed-controlled systems – an energy study for a loader crane application." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71186.
Full textHendrarsakti, Jooned. "A study of micro fiber dispersion using digital image analysis." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1156.
Full textSniegucki, Mateusz [Verfasser]. "Optimal Cylinder Commutation in Digital Hydraulic Pumps and Motors for Pulsation Minimization / Mateusz Sniegucki." Aachen : Shaker, 2016. http://d-nb.info/1106838459/34.
Full textSoyer, Isabelle. "Contribution a l'etude des transferts thermiques dans le sol : application a un evaporateur enterre de pompe a chaleur." Paris, ENSAM, 1987. http://www.theses.fr/1987ENAM0002.
Full textDakyo, Brayima. "Étude et réalisation de dispositifs à commande numérique pour l'alimentation d'une machine synchrone à aimants permanents par générateur photovoltaïque : stratégies de commande pour le pompage au fil du soleil." Le Havre, 1988. http://www.theses.fr/1988LEHA0003.
Full textLuna, Victoria García Claudia Elizabeth, Briceño Mayté Mercedes Salazar, and Camacho Natalia Silenne Vidal. "Gestión deportiva universitaria : uso del marketing digital para la atracción y retención de deportistas en la PUCP." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/9132.
Full textTesis
Christensen, Shane R. "An in vitro comparison of working length accuracy between a digital system and conventional film when vertical angulation of the object is variable." Connect to resource online, 2009. http://hdl.handle.net/1805/1926.
Full textTitle from PDF t. p. (viewed Aug. 21, 2009) Advisor(s): Mychel Vail, Acting Chair of the Research Committee, Joseph Legan, Kenneth Spolnik, Susan L. Zunt, Edwin Parks. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 109-120).
Atoui, Josef, Viktor Bäckman, Felix Lindgren, Johan Runestam, Rachel Homssi, Tommy Johansson, Jesper Jonsson, and Stranius Simon Wijk. "VERA - Virtual Emergency RoomAdministrator : En prototyp av framtidens digitala akutjournal." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166959.
Full textNystad, Marcus, and Lukas Lindblom. "Artificial Intelligence in the Pulp and Paper Industry : Current State and Future Trends." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279574.
Full textFramgångarna inom Artificiell Intelligens (AI) har fått stor uppmärksamhet de senaste åren och ökad medvetenhet har lett till stora fördelar för samhället liksom nya möjligheter för industrier som tar vara på dessa nya teknologier. Pappers- och massa industrin genomgår en av de mest omfattande transformationerna mot Industri 4.0. Integreringen av AI-teknologi i industrins tillverkningsprocesser has visat stor potential, men också osäkerhet kring vilken riktning företag är på väg mot. Denna studie är en undersökning av den svenska pappers- och massaindustrin, i samarbete med IBM, som syftar till att minska gapet mellan akademin och framstegen företag inom industrin tar. Mer specifikt är denna uppsats en kombinerad fallstudie av det nuvarande läget, barriärerna till AI-teknik i den svenska pappers- och massa industrin, de framtida trenderna och förväntningarna på AI och metoderna företag använder för att stötta AI-initiativ. Semi-strukturerade intervjuer genomfördes med 11 deltagare från tre olika perspektiv och datan var tematiskt kodad. Vår analys visar att användning av AI varierar och företag experimenterar huvudsakligen med omogen teknik. Flera trender och områden med potential för framtiden identifierades och det visades att digital innovationshantering är högt ansedd. Vi sammanfattar med att det finns flera barriärer som hindrar fortsatt användning av AI. Fortsatt arbete med AI-tekniken kommer leda till stora fördelar på lång sikt inom områden som prediktivt underhåll och fortsatt processoptimering. Flera åtgärder för att stötta AI-initiativ var identifierade och diskuterades. Vi uppmuntrar industrin att genomföra lämpliga åtgärder i det fortsatta arbetet mot AI-integration och uppmuntrar fortsatt forskning inom potentiella omstruktureringar inom FoU.
Vilchez, Lagos Neils Edison. "Diseño e implementación de un dispositivo de adquisición de imágenes para el PUCP-SAT1." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2014. http://tesis.pucp.edu.pe/repositorio/handle/123456789/7108.
Full textTesis
Thayananthan, V. "Design of run-length limited partial unit memory codes for digital magnetic recording and trellis coded quantisation based on PUM codes." Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287264.
Full textNattanmai, Ganesh Babu Goushik. "Assembly flow design and process data digitalization for Process Industries : Flow and Line balancing with Simulation for Paper and Pulp Instruments with digital Information management." Thesis, KTH, Industriell produktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286008.
Full textABB Lorentzen and Wettre i Kista tillverkar pappers- och massatestningsinstrument för pappersindustrin världen över. Enheten har ett produktsortiment med över 140 instrument. På grund av att monteringen av instrument utförs i en fixed position layout förekommer i nuläget lång genomloppstid jämförelse med den efterfrågade takten. Problemet med strategier för orderkontroll och produktionsplanering har fokuserats på företaget. Projektet fokuserar på monteringsupplägg med linje- och flödesbalansering för pappers- och massainstrumenten. Det ska utföras på fyra olika instrument med monteringsmetoder, layouter och sedan bestämma möjlig balansering av arbetsinnehåll. Det andra målet är analys av ledtider och Optimering av genomloppstid för ovannämnda produkter och rekommendation för reduktion, samt ytterligare anpassning till utmaningarna inom inköp och nettokapital för instrumenten. Det tredje målet innefattar informations- och dataflödesanalys för produktionen. Det fjärde målet är digitalisering av processinformation genom arbetsinstruktioner för data som används av montering och integreras vertikalt med ERP-systemet. Olika monteringsupplägg och strategier har utvärderats bland annat som traditionell U-shaped line, Mixed Product lines, Two-sided assembly och därefter the Rabbit chasing cell layout vid simulering med input data av monteringsprioritet, orderflöde och resursdistribution studerades. Analysen av utvärderingen baserades på operatörsuttnyttjande, genomloppstid och ledtider för instrumenten med lean balansering och bekräftar i flödesimuleringen för det dynamiska scenariot för planering av operationsföljd, schemaläggning och resursallokering i monteringen. Ledtiderna har optimerats med den nya strategin som valts som upplägg för monteringen. Digitaliseringen av Processdata har utförts på ett av instrumenten som ett pilotprojekt. Vertikal integration har föreslagits som en informationsmodell. Resultaten från monteringens balansering visar att de föreslagna monteringsstrategierna påverkar resultatet i monteringen vad gäller resurseffektivitet och produkt routing i ABBs manuella montering. Digitaliseringen av Processdata har anpassats nära till monteringsupplägg sedan omvandlingen från den Fixed position layout till monteringscellerna eller linjerna har betydande inflytande på produktkunskapen för resurserna i monteringen. Ledtiderna kan minskas med 32% i genomsnitt från 12 veckor till 8 veckor om man genomför de förslag som denna avhandling har påvisat av de instrument som utvärderats. Slutledningen av avhandlingen visar att det kommer att vara fördelaktigt att implementera utvärderingsmetoderna och gruppera dem över de andra instrumenten för ett mer effektivt och smartare produktion process.
Daun, Leandro Galvão 1987. "Estudo experimental da garantia de escoamento em curvas horizontais descendentes e aplicação à operação de um S-BCSS." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265636.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências
Made available in DSpace on 2018-08-23T09:29:35Z (GMT). No. of bitstreams: 1 Daun_LeandroGalvao_M.pdf: 5084421 bytes, checksum: 56e4661dc939fdef8c0383b09f63721f (MD5) Previous issue date: 2013
Resumo: Os desafios tecnológicos na produção de petróleo e gás têm aumentado consideravelmente nos últimos anos devido à busca por segurança, redução de custos e otimização da produção, como indicado pelo grande número de estudos sobre a garantia de escoamento. Uma grande preocupação está relacionada ao escoamento multifásico em equipamentos submarinos, onde podem ocorrer diferentes padrões de escoamento e fenômenos termo-fluido-dinâmicos. O presente trabalho tem por objetivo avaliar experimentalmente possíveis fenômenos de garantia de escoamento na entrada de um Sistema de Bombeio Centrifugo Submerso em Skid (S-BCSS), como o instalado no campo de Espadarte na costa brasileira. A atenção foi dada a possíveis sinais de surging da BCS, devido à presença de gás na fase líquida e mudança na orientação do escoamento a partir da horizontal para a vertical descendente, a montante da entrada da bomba. As condições de transição entre os padrões de escoamento "bolhas dispersas" e "intermitente" foram investigados em uma linha experimental com configuração do tipo U horizontal com braços superior, inferior e curvas de 90 graus. A tubulação da linha possui diâmetro interno de 60 milímetros e comprimento total de 32 metros, sendo testada com ar e água em uma ampla gama de composições de mistura permitindo a comparação com mapas de fluxo horizontal e vertical descendente encontrados na literatura. O comportamento dos limites de padrões de escoamento foi experimentalmente avaliado, indicando possibilidades de acumulo de gás na curva superior devido à mudança de padrão "bolhas dispersas" para "intermitente" quando há alterações de orientação do escoamento horizontal para vertical descendente. A existência de uma velocidade mínima da mistura capaz de assegurar o arrasto das bolhas pelo líquido foi também investigada. Diferentes correlações para a velocidade de deslizamento e parâmetro de distribuição foram testadas para o cálculo da fração de vazio. Isto foi realizado através da obtenção da velocidade média do gás local, por meio da obtenção de imagens em alta velocidade seguido de um processamento digital das mesmas. A fração de vazio foi calculada a partir da relação entre as velocidades superficiais e locais do gás. Através da comparação entre 2124 pontos experimentais, foi possível obter as melhores correlações de fração de vazio para diferentes intervalos, resultando na obtenção de diferentes valores de velocidades mínimas de mistura
Abstract: The technological challenges in the oil and gas production have increased considerably in recent years due to the search for safety, cost reduction and production optimization, as indicated by the large number of studies on flow assurance. One major concern is the multiphase flow in subsea equipment where different flow patterns and thermo-fluid-dynamic phenomena may occur. The present work is aimed at evaluating experimentally possible flow assurance phenomena at the inlet of a Subsea Skided ESP (mudline ESP) such as one installed at Espadarte field offshore Brazil. Attention was paid to possible surging of the pump due to the presence of gas bubbles within the liquid and change in flow orientation from horizontal to vertical downward upstream the ESP intake. First, the conditions at the transition between dispersed bubbles and intermittent flow were investigated in a horizontal U-type tube with top and down arms and 90-degree bends. A flow circuit of 60mm i.d. size and 32m was built and tested using air and water in a wide range of mixture compositions, allowing comparisons with horizontal and downward flow maps found in the literature. The behavior of flow pattern boundaries was experimentally evaluated and indicated no possibility of gas accumulation on the upper bend due when the flow pattern changes from dispersed bubbles to intermittent as the flow orientation changes from horizontal to downward. The requirement of a minimum mixture velocity capable of ensuring enough drag of the bubbles by the liquid was also investigated. Several different correlations for drift velocity and distribution parameter were tested for calculation of the void fraction. This was achieved by measuring the local average gas velocity using a high speed imaging and digital image processing. The void fraction was calculated from the ratio between superficial and local gas velocities. From comparison with 2,124 data points, the best void fraction correlation for each range was determined, from which reliable values for the minimum mixture velocity were determined
Mestrado
Explotação
Mestre em Ciências e Engenharia de Petróleo
Ley, Paul J. "An in-vitro comparison of working length determination between a digital system and conventional film when source-film/sensor distance and exposure time are modified." Connect to resource online, 2009. http://hdl.handle.net/1805/1928.
Full textTitle from PDF t.p. (viewed Aug. 11, 2009) Advisors: Mychel Vail, Chair of the Research Committee, Susan Zunt, Ted Parks, Kenneth Sponik, Joseph Legan. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 103-119).
Alvarado, Campos de Gozzer Lizbeth. "La Comunicación Integrada de Marketing en el sector editorial : la aplicación de una campaña piloto del Plan estratégico de comunicación y marketing digital para la tienda virtual del Fondo Editorial de la PUCP." Master's thesis, Pontificia Universidad Católica del Perú, 2018. http://tesis.pucp.edu.pe/repositorio/handle/123456789/10045.
Full textInternet has allowed academic publishers to internationalize their catalogs in a faster and easier way, digitalizing their production and using digital communication. In this context, the communications area of PUCP University Press has new possibilities to make its contents more visible and closer to their audience. With that purpose, we have developed a Communication and Marketing Plan based on Integrated Marketing Communications Theory, in which we use a set of strategies and actions in order to increase the visibility and accessibility of our catalog, locally and internationally.
Tesis
Gómez, Medina Carol Capuli, and Alejo Lady Sally Varillas. "El Inbound marketing en la Oficina Central de Admisión e Informes (OCAI) : Estudio de la captación PUCP de postulantes a través de los discursos de comunicación digitales." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2018. http://tesis.pucp.edu.pe/repositorio/handle/123456789/12854.
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Gutiérrez, Herrera María José. "La contribución de las plataformas digitales de información en la fase de exploración vocacional para la elección de una carrera universitaria : estudio de la página web Zona Escolar PUCP." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2018. http://hdl.handle.net/20.500.12404/13978.
Full textMelin, Timothy R. "Investigating Wood Welding Parameters Using a Prototype Welding Machine." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/420.
Full textSantos, Vasco Leiria Gomes Valadão. "Pump : um ginásio digital." Master's thesis, 2017. http://hdl.handle.net/10400.14/25665.
Full textToday's trends in society shape not only the way that we live but also the way brands define their strategies. At a time that there are two major current trends: the use of digital technologies & the search for a healthy lifestyle; the fitness industry has become one of the most attractive investment sectors, which has resulted in a highly competitive market with a great and varied supply. Therefore, brands are forced to reinvent themselves and innovate so that they can stand out in the market. The Pump project, a Digital Gymnasium, arises not only in the wake of these brands trends and needs, but also as a personal conviction and a detected failure in the market. The project main objective is to develop a new service proposal for the pump gymnasium chain, which aims not only to monitor trends but also to serve as a brand differentiating factor. Also, as a useful, practical and innovative tool for all its users. We are talking about a mobile application that will allow its users to train wherever and whenever they want, in a simple, practical and very accessible way. In order to develop the project, a few methodological tools were used such as bibliographical research, interviews or focus group. These tools allowed to collect all the information that served the construction and structuring basis of the proposed idea.
Lucier, Peter E. "Design of a digital servo-electric pump/motor displacement controller." 1995. http://catalog.hathitrust.org/api/volumes/oclc/34102780.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 67-68).
林玉森. "A microprocessor-based digital pump controller for phase-locked servo system." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/74747920283695459963.
Full textHwang, Tsuen-Shiau, and 黃存孝. "Analysis and Design of the Phase-Locked Loop with Fast-Digital-Calibration Charge Pump." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/8f92cy.
Full text國立臺北科技大學
電腦與通訊研究所
98
Phase-Locked Loops (PLLs) have been widely used in modern wireline and wireless communication systems. The performance of PLLs has been strictly specified in phase noise, timing jitter, and reference spur level. In a PLL, the Voltage Controlled Oscillator (VCO) is sensitive to process variations, Charge Pump (CP) current mismatch. Generally, reducing the loop bandwidth will decrease spur, but it will increase settling time. Besides, spurious tone power can be reduced by increasing the linearity of key circuit blocks such as the CP and divider. In order to overcome these problems, a PLL with fast-digital-calibration technique is proposed. This thesis introduces a fast-digital-calibration technique to reduce current mismatch of CP in PLL. This current mismatch of CP in PLLs generates fluctuations on the input of VCO. Therefore, output of VCO will increase reference spur in PLL. Improving current match of CP not only reduces reference spur but also decreases the static phase offset in PLLs. Therefore, the constant current supports the PLL dynamics precisely. In this brief, a 2.12-to-2.7GHz frequency synthesizer has been verified in TSMC 0.18μm CMOS 1.8V process. In this thesis, it exhibits phase noise 124.5dBc/Hz at 1MHz offset, and VCO tuning range is 27%. By using the fast-digital-calibration technique demonstrates current mismatch of less than 0.97% and the operation range of proposed CP is between 0.2V and 1.6V. Total power consumption is 22.57mW and the settling time takes no more than 25μs in the proposed PLL.
Leandro, Gonçalo Alexandre Raposeiro. "Digital PLL for ISM applications." Master's thesis, 2017. http://hdl.handle.net/10362/30818.
Full textKumar, Rajesh. "A Radiation Tolerant Phase Locked Loop Design for Digital Electronics." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8547.
Full textHsu, Shih-Ying, and 許世穎. "A 10-bit 5 MS/s Successive Approximation Register Analog-to-Digital Converter with Charge-Pump Phase-Locked Loop." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/r868q2.
Full text國立臺北科技大學
電機工程系
106
This thesis presents a successive approximation register analog-to-digital converter (SAR ADC), which is fabricated in TSMC 0.25μm 1P3M CMOS high-voltage process for electric car. There are two chips were designed, in this thesis, the first chip(chip1) is a 10-bit 5MS/s SAR ADC; and the second chip(chip2) is the modified one, which is combined a charge-pump phase-locked loop and improved the chip1 sample and hold circuit and dynamic comparator. Two chips used a monotonic capacitor switching procedure to reduce power consumption. A high-speed SAR ADC is hard to implement due to the TSMC 0.25μm CMOS is a high-voltage process, especially for integrating with motor control circuit. The TSMC 0.25μm CMOS high-voltage process lays the NBL (N-type buried layer) in the end for the withstand voltage. This layer leads to all of PMOS bodies to be shorted together. It is necessary to avoid from this negative impact, that the body is connected to source. The measurements of chip1 show that, the SFDR, SNDR, ENOB, power consumption, and chip area are 62.2 dB, 53.82 dB, 8.65 bits, 855 μW, and 0.974×0.975 mm^2, respectively; and that the post simulation of chip2 show that, the SFDR, SNDR, ENOB, power consumption, and chip area are 75.92 dB, 58.23 dB, 9.38 bits, 1256 μW, and 1.261×0.975 mm^2, respectively.
Lin, Yuming, and 林育民. "Study of Charge Pump Circuits for UHF RFID Tag and 10 bits 250MS/s Current-Steering Digital-to-Analog Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94670037659013069801.
Full text國立暨南國際大學
電機工程學系
99
In this thesis achieve circuit is applied to UHF 915MHz RFID Tags , transfering small radio waves into stable DC voltage for the use of next stage circuit. Because RF signal losses quickly in air, much smaller than -15dBm, the issue of using a charge pump to supply sufficient and stable DC voltage is important. And this technology can be further applied in wireless charging technology, not only in wireless sensor system but also in various technology products such as mobile phones, MP3, wireless communications, and camera…In this thesis, I implement the charge pump circuits by TSMC 18µm 1P6M process. In order to achieve a stable supply meet the specifications of the DC voltage, the circuit layout includes a matching network, voltage multiplier, voltage limiting circuit, reference voltage circuit, and Regulator. The simulation and layout of the thesis is to achieve a 250MHz 10bits current steering DAC, and is expected to complete tape out by 35um 2p4m process provided by Taiwan Semiconductor Manufacturing Company provided . The circuit layout design has two parts - digital and analog. To reduce the glitch and differential nonlinearity (DNL), integral nonlinearity (INL) and to maintain the transfer curve monotonic the circuit is designed to be segmented structure, in which the highest 6bits MSB is the thermometer decoder and the lowest 4bits LSB is weighted binary code. The circuit is composed of 4 main parts: (1) digital circuit (2) clock drive, buffer (3) Deglitch Latch (4) current units. And current steering DAC output current do not need to output buffer can Directly drive the load resistance, so better than other architecture has speed advantages.
Hu, Bang-Sheng, and 許邦陞. "Design and Implementation Low-Ripple Charge Pump with Digitally-Controlled Oscillator." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/u76f88.
Full text國立高雄師範大學
電子工程學系
107
Charge pump circuits are widely used in flash memory, LCD monitor and three-dimensional VLSI, in recent years, many charge pump circuits have been studied and proposed, which are all improvements for performance and threshold voltage, and most of them are constructed by Dickson charge pump, which only used PMOS to design the positive voltage charge pump circuit. In this thesis, a PMOS, as a diode is proposed and using non-overlap clock circuit to control the low ripple voltage charge pump. First stage gate control effectively suppresses the associated inversion loss mechanism, and then the output voltage is divided into the detection control in the circuit. If output voltage is lower than the reference voltage, the digital control signal not only control the compensation driving circuit, which will turn on the corresponding compensation circuit, but also control the output frequency of digitally controlled oscillator(DCO) with the range of 2 MHz to 8 MHz. When the output voltage is charged to the certain value, the frequency which generated by DCO is increased to inhibit the ripple of the output voltage. The proposed circuit is designed in a standard UMC 0.18-μm 1P6M CMOS process. The input supply voltage is 3.3V. The main capacitance is 300 nF and the load capacitance is 2 μF. The output voltage range is 4.5 V to 5 V, and its ripple voltage is 112 μV. The power consumption is 14.08 mA with the maximum load current of 150 mA Up to 89% efficiency at load currents of 30 mA.
Christensen, Shane R. (Robert) 1977. "An in vitro comparison of working length accuracy between a digital system and conventional film when vertical angulation of the object is variable." Thesis, 2009. http://hdl.handle.net/1805/1926.
Full textAccurate determination of working length during endodontic therapy is critical in achieving a predictable and successful outcome. Working length is determined by the use of electronic apex locators, tactile perception, knowledge of average tooth lengths and dental radiography. Due to the increasing use of digital radiography in clinical practice, a comparison with conventional film in working length determination is justified. The purpose of this study is to determine if there is a difference between Schick digital radiography and Kodak Ultra-speed film in the accurate determination of working lengths when vertical angulation of the object is variable. Twelve teeth with #15 K-flex files at varying known lengths from the anatomical apex were mounted in a resin-plaster mix to simulate bone density. A mounting jig for the standardization of projection geometries allowed for exact changes in vertical angulation as it related to the object (tooth) and the film/sensor. Each tooth was imaged using Schick CDR and Kodak Ultra-speed film at varying angles with a consistent source-film distance and exposure time. Four dental professionals examined the images and films independently and measured the distance from the tip of the file to radiographic apex and recorded their results. The error in working length was calculated as the observed value minus the known working length for each tooth type. A mixed-effects, full-factorial analysis of variance (ANOVA) model was used to model the error in working length. Included in the ANOVA model were fixed effects for type of image, vertical angulation, and the interaction of angle and film type. Tooth type and examiner were included in the model as random effects assuming a compound symmetry covariance structure. The repeatability of each examiner, for each film type, was assessed by estimating the intra-class correlation coefficient (ICC). The ICC was determined when 12 randomly selected images and radiographs were reevaluated 10 days after initial measurements. The repeatability of each examiner for Schick CDR was good with ICCs ranging from 0.67 to 1.0. Repeatability for the conventional film was poor with ICCs varying from -0.29 to 0.55. We found the error in the working length was not significantly different between film types (p = 0.402). After adjusting for angle, we found that error in the working length from the digital image was only 0.02 mm greater (95-percent CI: -0.03, 0.06) than the conventional film. Furthermore, there was not a significant difference among the angles (p = 0.246) nor in the interaction of image type with angle (p = 0.149). Based on the results of our study, we conclude that there is not a statistically significant difference in determining working length between Schick CDR and Kodak Ektaspeed film when vertical angulation is modified.
Loureiro, Henrique Medina. "Endodontia guiada: acesso endodôntico – revisão narrativa." Master's thesis, 2021. http://hdl.handle.net/10284/10373.
Full textThe Guided Endodontic technique makes the endodontic treatment more predictable and safer in tooth which tooth condition is of calcification. The pulp canal calcification is one of the factors that turn endodontic treatment challenging and have the capacity of compromise the access of instruments and irrigant solutions to the entire extension of the root canal, making it impossible to disinfect it adequately. The present work is a narrative review of the Literature that aims to explain how should be performed this new approach, in which cases should be implemented and its indications and limitations. It was proceeded the comparison of the efficacy between different types of access cavities, guided and ‘non-guided’ cavities, study of the minimally invasive cavities and which is the main advantage that the guided approach adds to endodontic treatment. It is intended, as well, that this work could be a useful guide for Dentists.
Ley, Paul J. (Joseph) 1980. "An in-vitro comparison of working length determination between a digital system and conventional film when source-film/sensor distance and exposure time are modified." Thesis, 2009. http://hdl.handle.net/1805/1928.
Full textAccurate determination of working length during endodontic therapy is a crucial step in achieving a predictable outcome. This is determined by the use of electronic apex locators, tactile perception, and knowledge of average tooth lengths and/or dental radiography whether digital or conventional is utilized. It is the aim of this study to determine if there is a difference between Schick digital radiography and Kodak Insight conventional film in accurately determining working lengths when modifying exposure time and source-film/sensor distance. Twelve teeth with size 15 K-flex files at varying known lengths from the anatomical apex were mounted in a resin-plaster mix to simulate bone density. Each tooth was radiographed while varying the source-film/sensor distance and exposure 122 time. Four dental professionals examined the images and films independently. Ten images and 10 films were selected at random and re-examined to determine each examiner?s repeatability. The error in working length was calculated as the observed value minus the known working length for each tooth type. A mixed-effects, full-factorial analysis of variance (ANOVA) model was used to model the error in working length. Included in the ANOVA model were fixed effects for type of image, distance, exposure time, and all two-way and three-way interactions. The repeatability of each examiner for each film type was assessed by estimating the intra-class correlation coefficient (ICC). The repeatability of each examiner on digital film was good with ICCs ranging from 0.67 to 1.0. Repeatability on the conventional film was poor with ICCs varying from -0.29 to 0.55.We found there was an overall difference between the conventional and digital films (p < 0.001). After adjusting for the effects of distance and exposure time, the error in the working length from the digital image was 0.1 mm shorter (95% CI: 0.06, 0.14) than the error in the working length from the film image. There was no difference among distances (p = 0.999) nor exposure time (p = 0.158) for film or images. Based on the results of our study we conclude that although there is a statistically significant difference, there is no clinically significant difference between digital radiography and conventional film when exposure time and source-film/sensor distance are adjusted.
Mugangavari, Beaulah. "Exploring the potential of sustainable utilisation of the baobab tree (Adansonia digitata) to improve food security. A case study of the south-east lowveld of Zimbabwe." Diss., 2019. http://hdl.handle.net/10500/26198.
Full textAgriculture and Animal Health
M. Sc. (Agriculture)