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.
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The digital displacement hydraulic piston pump is a hybrid device which combines a microcompressor with an established form of high-pressure pump to create a highly integrated machine which can produce a variable high-power output directly from an electronic command. The actively controlled inlet poppet-valve in each cylinder can be held open against the discharging flow in order to disable it during a single cycle. Cylinders can be disabled in this manner, following a maximally smooth sequence, allowing a controlled output flow to be achieved. A compliant device located near the pump, such as an accumulator, provides time-averaging of the flow pulsations in order to minimise the effects of the quantisation error caused by cylinder disabling. The advantages of this approach over the conventional variable-swash axial piston pump lie with both the response speed and the inherent energy efficiency of real-time cylinder selection. Disabling cylinders in this way restricts parasitic losses to very low levels since unused cylinders are not pressurised nor do they incur loads on their associated bearings. The response time of the pump is related to shaft speed, with the pump able to attain either full or zero output from any starting condition, in less than a single shaft revolution. At induction motor speeds this allows large-signal response times of the same order as those achieved by commercial proportional valves. The thesis chronicles the development of the Digital Displacement pump. It begins with the formulation of a simulation model which is able to predict the behaviour of the machine in both flow and pressure control modes. The valve control possibilities are then explored and the design of active valve latches using finite-element analysis described. The sinusoidal flow forces on the disabled poppet are evaluated through a large range of experiments and the results condensed into parametric equations useful for predicting the valve latching requirements of most machines. The mechanical and electronic hardware design, leading to the construction of the prototype, is then discussed.
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Pellegri, 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.
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Reducing the energy consumption of off-highway machinery due to poor system efficiency is an urgent challenge. Several advanced and innovative architectures have been proposed over the years to tackle this problem, but very few of them found fertile ground for commercial applications due to increased complexity and cost. In this paper, the design, implementation, and testing of a multi-service Digital Displacement ® Pump architecture applied to an excavator are presented. The Digital Displacement ® Pump allows for a dynamic physical displacement allocation to services at different pressure levels, thus reducing throttling losses required to operate multiple actuators simultaneously. A feed-forward control logic is implemented and applied to the system using a closed-centre architecture. The results indicate a fuel reduction of more than 30% compared to the baseline excavator.
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Burbidge, 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.
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Madhusudanan, 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.
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Hydraulics has always been the first choice of actuation in off-road, construction and mining vehicles due to its power density, low cost, built in cooling and lubrication. However, the current state of our environment along with stricter regulations has brought light to newer technologies within hydraulics to improve the existing system. This urge to enhance efficiency and reduce energy consumption has led to a point where new technologies must be evaluated. One such technology is the programmable hydraulic pump called the digital displacement pump (DDP). This new pump may have the potential to revolutionize mobile hydraulics as it can be used to improve part load efficiencies, response and make it easier to control from a system perspective. The DDP is a radial piston pump that has been fit with solenoid on/off valves at the inlet of each cylinder to control the flow of the working fluid. The displacement setting of the pump depends on the displacement of each cylinder controlled digitally by the 'active' inlet valve. The pump can act as a single unit to supply one circuit or it can dedicate pistons for supplying several circuits in parallel using different pump outlet configurations. They can be setup to run in pressure controlled or flow controlled systems to achieve the above mentioned flow sharing capability. An energy study based on two fixed drive cycles (short and intermediate) are conducted on the existing system of a loader used for mining called the ST14 Battery. A breakdown of the energy consumption in the machine is created to look at the impact of the three main actuators (boom, bucket and steering), pump losses and throttling losses have. The losses due to simultaneous load handling and the energy that can be saved by swapping the pumps with a digital displacement pump are also found out and analysed. A model of the existing hydraulic system is made using Simulink and Hopsan using the data and results from the energy study. It will be used to simulate and evaluate future system architectures. This model is then used to simulate a system architecture where the existing pumps are swapped with digital displacement pumps. This architecture is more energy efficient due to the higher energy efficiency of the pump. The findings from the energy study and simulations are compared and results are obtained regarding power losses, energy consumption and overall usability of the models. The addition of the two DDP’s instead of the existing inline pumps has resulted in energy savings resulting in 4% more running time in the intermediate cycle and 5.6% in the short cycle while keeping the functionality of the machine.
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Fu, 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.
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Al, 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.
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Al, 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.
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Yogesh, 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.
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In a conventional charge-pump based PLL design, the loop parameters such as the band-width, jitter performance, charge-pump current, pull-in range among others govern the ar-chitecture and implementation details of the PLL. Different loop parameter specificationschange with a change in the reference frequency and inmost cases, requires careful re-designof some of the PLL blocks. This thesis describes the implementation of a semi-digital PLLfor high bandwidth applications, which is self-compensated, low-power and exhibits band-width tracking for all reference frequencies between 40 MHz and 1.6 GHz in 65nm CMOStechnology.This design can be used for a wide range of reference frequencies without redesigning anyblock. The bandwidth can be fixed to some fraction of the reference frequency during designtime. In this thesis, the PLL is designed to make the bandwidth track 5% of the referencefrequency. Since this PLL is self-compensated, the PLL performance and the bandwidthremains same over PVT corners.
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Vyas, 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.
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The objective of this research is to develop an embedded, wireless, energy-harvesting prototype (E-WEHP) that can power on and sustain embedded sensing functions using the power present in ambient wireless signals in urban areas. This research is part of a bigger effort towards greening RF circuits and applications in order to reduce their pollution foot-print. Pollution due to modern electronics is primarily caused by non-biodegradable packaging waste and batteries that form a big part of most electronics. Electronic waste can especially be a nuisance in RFID and wireless sensors that are mass-produced and widely-used in consumer items, buildings, industries, agriculture and transportation.
The first part of this research effort addresses the issue of minimizing electronic packaging waste by characterizing and using biodegradable substrates such as Paper and Perfluoropolymer (PFA) as a dielectric material in RF circuits. Towards this goal, the first of its kind active wireless sensor modules made of biodegradable paper substrate using a clean and novel inkjet-printing technology is developed and successfully operated in the 900 MHz free ISM band.
The second and third part of this research effort addresses the issue of battery waste by investigating the use of ambient solar and wireless radiation for powering RF and embedded electronics for wireless localization and sensing applications without the use of batteries. The second part of this work presents a unique solar-powered tag called SOLTAG that combines solar cells along with an RFID-type powering mechanism to implement a very low-cost, battery-less, semi-passive wireless-tag but with a much longer range than passive EPC-Gen2 RFID tags. A GPS-like, low-cost, vehicle-tracking system based on a received-signal-strength-indication method using SOLTAGs in vehicles and a wireless network of Mica-motes is successfully developed and tested with accuracy down to 1.62 meters
The third and main part of this research work presents a novel embedded-wireless-energy-harvesting-prototype (E-WEHP) that can successfully power-on and sustain sensing and M2M peripherals in a 16-bit microcontroller using the power present in ambient, wireless, Digital-TV signals without the use of batteries. This work involves an in-depth characterization of OFDM signals used in Digital-TV broadcasts in Tokyo and Atlanta along with the design and development of the E-WEHP hardware and firmware that exploits the multi-carrier nature of such TV signals for powering itself at a range of over 6 km from the TV broadcast sources. This work opens up the possibility of pervasively powering sensor motes for applications such as environmental sensing, smart homes, structural health monitoring, security and internet of things without the environmental and logistical cost of periodic battery replacement and disposal.
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Terlemez, Bortecene. "Oscillation Control in CMOS Phase-Locked Loops." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4841.
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Recent advances in voltage-controlled oscillator (VCO) design and the trend of CMOS processing indicate that the oscillator control is quickly becoming one of the forefront problems in high-frequency and low-phase-noise phase-locked loop (PLL) design. This control centric study explores the limitations and challenges in high-performance analog charge-pump PLLs when they are extended to multiple gigahertz applications.
Several problems with performance enhancement and precise oscillator control using analog circuits in low-voltage submicron CMOS processes, coupled with the fact that analog (or semi-digital) oscillators having various advantages over their digitally controlled counterparts, prompted the proposal of the digitally-controlled phase-locked loop. This research, then, investigates a class of otherwise analog PLLs that use a digital control path for driving a current-controlled oscillator. For this purpose, a novel method for control digitization is described where trains of pulses code the phase/frequency comparison information rather than the duration of the pulses: Pulse-Stream Coded Phase-Locked Loop (psc-PLL).
This work addresses issues significant to the design of future PLLs through a comparative study of the proposed digital control path topology and improved cutting-edge charge-pump PLLs.
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Gong, Hua. "3D Printing for Microfluidics." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7690.
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This dissertation focuses on developing 3D printing as a fabrication method for microfluidic devices. Specifically, I concentrate on the 3D printing approach known as Digital Light Processing stereolithography (DLP-SLA) in which serially projected images are used to sequentially photopolymerize layers to build a microfluidic device. The motivation for this work is to explore a much faster alternative to cleanroom-based microfabrication that additionally offers the opportunity to densely integrate microfluidic elements in compact 3D layouts for dramatic device volume reduction. In the course of my research, an optical approach was used to guide custom resin formulation to help create the interconnected hollow regions that form a microfluidic device. This was based on a new a mathematical model to calculate the optical dose delivered throughout a 3D printed part, which also explains the effect of voids. The model was verified by a series of 3D printed chips fabricated with a commercial 3D printer and a custom resin. Channels as small as 108 µm x 60 µm were repeatably fabricated. Next, highly compact active fluidic components, including valves, pumps, and multiplexers, were fabricated with the same 3D printer and resin. The valves achieved a 10x size reduction compared with previous results, and were the smallest 3D printed valves at the time. Moreover, by adding thermal initiator to thermally cure devices after 3D printing, the durability of 3D printed valves was improved and up to 1 million actuations were demonstrated.To further decrease the 3D printed feature size, I built a custom 3D printer with a 385 nm LED light source and a 7.56 µm pixel pitch in the plane of the projected image. A custom resin was also developed to take advantage of the new 3D printer's features, which necessitated developing a UV absorber screening process which I applied to 20 candidate absorbers. In addition, a new mathematical model was developed to use only the absorber's molar absorptivity measurement to predict the resin optical penetration depth, which is important for determining the z-resolution that can be achieved with a given resin. The final resin formulation uses 2-nitrophenyl phenyl sulfide (NPS) as the UV absorber. With this resin, along with a new channel narrowing technique, I successfully created flow channel cross sections as small as 18 µm x 20 µm.With the custom 3D printer, smaller valves and pumps become possible, which led to the invention of a new method of creating large numbers of high density chip-to-chip microfluidic interconnects based on either simple integrated microgaskets (SIMs) or controlled-compression integrated microgaskets (CCIMs). Since these structures are directly 3D printed as part of a device, they require no additional materials or fabrication steps. As a demonstration of the efficacy of this approach, 121 chip-to-chip interconnects in an 11 x 11 array for both SIMs and CCIMs with an areal density of 53 interconnects per square mm were demonstrated, and tested up to 50 psi without leaking. Finally, these interconnects were used in the development of 3D printed chips with valves having 30x smaller volume than the valves we previously demonstrated. These valves served as a building block for demonstrating the miniaturization potential of an active fluid mixer using our 3D printing tools, materials, and methods. The mixer provided a set of selectable mixing ratios, and was designed in 2 configurations, a linear dilution mixer-pump (LDMP) and a parallelized dilution mixer-pump (PDMP), which occupy volumes of only 1.5 cubic mm and 2.6 cubic mm, respectively.
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Ma, Jie. "Human Endogenous Sodium Pump Inhibitors Measurement, Source, Synthesis and Regulation." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2953.
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The sodium pump (SP or Na+,K+-ATPase) is a membrane embedded protein complex that pumps 3 sodium ions out and 2 potassium ions into the cell per cycle and in so doing creates a cell membrane electrochemical potential. The membrane potential is critical for any functional cell. In the vasculature, reduction in the voltage potential causes vascular smooth muscle contraction and a narrowing of blood vessels (vasoconstriction) which can lead to increased blood pressure (hypertension). Substantial research over the past several decades has provided a vast amount of research on SP inhibitors, sometimes called endogenous digitalis-like factors (EDLF). Increased levels of these factors have been implicated in many hypertensive disorders including preeclampsia (PE), a life-threatening complication of pregnancy. It has been demonstrated that EDLF might be a causative factor in the pathophysiology of hypertension in PE. In order to elucidate EDLF production and regulation in PE, We developed a radioimmunoassay (RIA) measuring EDLF that could be applied to serum from pregnant women, placental homogenate and placental tissue culture. This assay employs Digibind, a commercially available Fab fragment derived from polyclonal antidigoxin antibodies that cross reacts with EDLF, as the primary antibody. Using Digibind RIA, we demonstrated that placenta is a source of EDLF production and regulation. Moreover, the identification of an inhibitor, ketoconazole and a substrate, 17-hydroxyprogesterone of the synthetic pathway of EDLF in placenta proved that this pathway shares steps with the steroid synthetic pathway. Some potential regulatory agents which have elevated levels in PE or be associated in PE and thus are thought to mediate PE, such as hydrogen peroxide, tumor necrosis factor-α (TNF-α) and hypoxia have also been demonstrated to be stimuli of EDLF production in placenta. These findings are helpful to the further study on EDLF synthesis and regulation in placenta. Once we elucidate the mechanisms, it could be easier to provide deeper insights into the pathogenesis of PE and subsequently develop earlier diagnosis and effective prevention of or therapeutic approaches to PE.
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Levi, 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.
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Lopes, 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.
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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia Electrotécnica e ComputadoresThe 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.
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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.
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Imagine a system with a pump driven by a speed-controlled electric motor. What and how much can be gained by using a pump with discretely variable displacement instead of a conventional fixed pump in such a system? This question is the focus in this paper, in which a simulation study based on a drive cycle for a loader crane is presented. The results indicate that the system efficiency from inverter input to pump output can increase by a few percentages. This might be considered small in relation to the increasing complexity that comes with discrete displacement. However, the results also show that a system with discrete displacement substantially reduces torque and cooling requirements on the electric motor. The required maximum torque can be reduced by 30 to 50 % and the motor can generate up to 40 % less heat since it can work in more efficient conditions. These potential benefits will be obtained with only a few discrete displacement settings available.
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Hendrarsakti, Jooned. "A study of micro fiber dispersion using digital image analysis." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1156.
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The area of the digital image processing is getting more attention in the hope that it will increase the accuracy of any scientific measurements, such as in determining an object velocity, temperature, and size. While human vision is excellent to recognize and differentiate objects, it has been proven to be a poor tool when it comes to measure the object performance. One of many digital image processing applications is texture analysis whose purpose is to evaluate image patterns. The purpose of this dissertation is to investigate the use of texture analysis as a tool to micro fiber dispersion measurement. Micro fiber dispersion can be found in many applications such as in paper and industry powder engineering.
Three cases related to micro fiber dispersion were investigated in this study. The first case was the experimental study of the dispersion in open water channel. Sets of synthetic fibers were put into water channel to simulate a process that can be found in papermaking industry. The research investigated the effect of three operating parameters: fluid velocity, fiber consistency, and fiber aspect ratio to fiber dispersion. Using two-factorial experimental design technique, the main and interaction effects of these parameters were evaluated. The study found that increasing fluid velocity, fiber aspect ratio, and consistency decreased the dispersion level. The study also found that the effect of individual parameters is more pronounced than the role of the interactive terms on the fiber flocculation.
The second case considered was applying the fiber dispersion analysis to computer-synthesized images consisting of different arrangements of fibers. Four sets of sub-cases were presented. These sub-cases were divided based on the fiber-concentrated location and fiber distribution. The use of computer-synthesized images was found to be very useful to simulate real situation during fiber dispersion.
The third case investigated the fiber distribution on a dry paper. Images for different types of paper were taken and evaluated to see the dispersion level of each type of paper. It was found that the current texture analysis was applicable to determine the dispersion level for dry papers.
While three cases indicated that the texture analysis can be used to investigate the fiber dispersion, the texture analysis used here is not a perfect and universal method and may not be suitable to analyze other types of dispersions. The human vision will always be essential to determine if the texture analysis is applicable to any other problem.
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Sniegucki, 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.
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Soyer, 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.
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Exploitation des mesures de l'installation experimentale comportant un evaporateur enterre a faible profondeur et un condensateur noye dans la dalle d'un batiment. Comparaison des resultats avec une simulation numerique. Etude economique comparative avec divers types de chauffage classiques. Etude de rentabilite
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Dakyo, 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.
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La notion de degré de liberté pour l'optimisation de la conversion d'énergie est introduite et reliée aux différents dispositifs utilisables pour associer la machine synchrone au générateur. La réalisation de ces dispositifs associés à une commande numérique par microordinateur flexible et conviviale est décrite. Les fonctionnements et stratégies de commande sont étudies pour deux types de systèmes : alimentation par onduleur de courant a thyristor, a commutation naturelle avec un ou deux degrés de liberté; l'alimentation en tension ou en courant par un onduleur de tension MLI en technologie Mosfet.
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Luna, 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.
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La presente investigación profesional tiene por objeto diagnosticar y proponer acciones
de mejora en el proceso de atracción y retención de alumnos deportistas en la Pontificia
Universidad Católica del Perú (PUCP). La entidad encargada de la administración del deporte en
la PUCP es la Oficina de Servicios Deportivos (OSD), que tiene como objetivo liderar la práctica
deportiva a nivel universitario. Así, la OSD busca sobresalir en los diversos encuentros deportivos
donde participa y, para lograrlo, reconoce la necesidad de tener a los mejores deportistas de la
universidad dentro de sus equipos.
Por ello y ante la poca eficiencia de su plan actual de atracción y retención de deportistas,
la presente investigación propone acciones de mejora utilizando como principal herramienta el
Marketing Digital empleando el Embudo de Conversión de Marketing Digital como estrategia
para realizar el diagnóstico y la propuesta de mejora. Esto debido a que es un medio de
comunicación efectivo que permitirá el conocimiento, difusión de la información y una adecuada
interacción entre la OSD y su público objetivo: los deportistas. El Embudo de Conversión permite
visualizar de manera integral la estrategia de marketing digital utilizada y cuantificar los
resultados.
Es importante resaltar la relevancia de la presente investigación, no solo para la OSD,
sino que también puede servir para que organizaciones con similares características empleen
como referencia las distintas acciones de mejoras propuestas, así como las herramientas utilizadas
a fin de contribuir a que éstas puedan alcanzar sus objetivos con sus clientes actuales y
potenciales.Tesis
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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.
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Thesis (M.S.D.)--Indiana University School of Dentistry, 2009.Title 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).
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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.
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Denna rapport är en beskrivning av ett kandidatarbete utfört som del av kursen TDDD96 - Kandidatprojekt i programvaruutveckling vid Linköpings universitet. Teamet som utförde arbetet bestod av åtta ingenjörsstudenter som studerar på data- respektive mjukvaruteknikprogrammet. Syftet med projektet var att ta fram en prototyp till en digitaliserad akutjournal åt Region Östergötland för deras arbete på akutmottagningarna i Linköping, Norrköping och Motala. Denna digitala akutjournal ämnar i ett senare skede ersätta den nuvarande pappersbaserade lösningen. I utvecklingsprocessen användes en modifierad version av det agila ramverket Scrum. Resultatet blev en webbapplikation för fullstorleksskärmar med vyer såsom en enhetsöversikt och en patientvy, och med möjlighet att definiera patienter i systemet och ta emot notifikationer. Förutom att redovisa och diskutera det gemensamma arbetet finns också individuella delrapporter som behandlar relaterade ämnen.
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Nystad, 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.
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The advancements in Artificial Intelligence (AI) have received large attention in recent years and increased awareness has led to massive societal benefits and new opportunities for industries able to capitalize on these emerging technologies. The pulp and paper industry is going through one of the most considerable transformations into Industry 4.0. Integrating AI technology in the manufacturing process of the pulp and paper industry has shown great potential, but there are uncertainties which direction companies are heading. This study is an investigation of the pulp and paper industry in collaboration with IBM that aims to fill a gap between academia and the progress companies are making. More specifically, this thesis is a multiple case study of the current state and barriers of AI technology in the Swedish pulp and paper industry, the future trends and expectations of AI and the way organizations are managing AI initiatives Semi-structured interviews were conducted with 11 participants from three perspectives and the data was thematically coded. Our analysis shows that the use of AI varies, and companies are primarily experimenting with a still immature technology. Several trends and areas with future potential were identified and it was shown that digital innovation management is highly regarded. We conclude that there are several barriers hindering further use of AI. However, continued progress with AI will provide large benefit long term in areas such as predictive maintenance and process optimization. Several measures taken to support initiatives with AI were identified and discussed. We encourage managers to take appropriate actions in the continued work toward AI integration and encourage further research in the area of potential reworks in R&D.Framgångarna 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.
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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.
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En la actualidad el uso de los satélites es variado y destacan las misiones comerciales, científicas y militares. Estos se utilizan en el campo de las telecomunicaciones, en los sistemas de posicionamiento global, en la teledetección, en el campo de la meteorología, en el estudio de la radiación, en la exploración del espacio y muchas más aplicaciones.
Encontramos satélites cada vez más pequeños como los nano y pico-satélites que permiten, a pequeñas empresas y universidades de todo el mundo desarrollar tecnología espacial en los sistemas de energía, de control, de comunicación, diseño estructural, cargas útiles, entre otros como por ejemplo un sistema de adquisición de imágenes.
La Pontificia Universidad Católica del Perú (PUCP) desarrolla su propia tecnología espacial al elaborar el nano-satélite PUCP-SAT-1, el femto-satélite POCKET-PUCP y otros satélites futuros. La presente tesis tiene como objetivo principal el diseño e implementación de un prototipo de un sistema de adquisición de imágenes, cuyo volumen debe ser menor al de un octavo del volumen de un CubeSat.
Para el desarrollo del sistema se llevará a cabo el análisis del hardware más adecuado para el satélite considerando el entorno de su órbita. Se diseñará e implementará el hardware y software necesarios para lograr la captura de imágenes y almacenarlas en una memoria flash.Tesis
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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.
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Nattanmai, 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.
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The ABB Lorentzen and Wettre in Kista produces Paper and Pulp Testing Instruments for Paper Mills worldwide. The unit has product range of over 140 instruments. In the production there is significantly longer throughput times compared to the demand takt in the assembly of instruments since they are working in a Fixed position layout. The problem with order control and production planning strategies have been focused on the company. The Project focuses on the assembly design with line and flow balancing of the Paper and pulp Instruments. It has been performed for 4 Instruments with various types of Assembly methodologies, layouts and determine feasible work content balancing. The second objective is the Lead Time analysis and Throughput time optimization for the above-mentioned Products and recommendation for reduction. And further aligning with the challenges within sourcing and net-working capital for the instruments. The third objective is in the Shop floor Information data analysis. The fourth objective is the digitalization of process information through work Instructions of process data used by Assembly and integrating vertically with the ERP system. Several assembly design strategies were evaluated as traditional U-shaped line, Mixed product lines, Two-sided assembly as well as the Rabbit chasing cell layout using simulation with input regarding assembly precedence, order flow and resource routing were studied. The strategies were evaluated based on the operator utilization, throughput, and lead times for the Instruments with the Line balancing. Furthermore, validating in flow simulation for the dynamic scenario of the product routing, scheduling, and resource allocation in the Assembly. This means that the assembly design was chosen as the strategy with the shortest lead time, throughput time for the products. The process data digitalization has been performed for one of the instruments as a pilot project and vertical integration has been proposed as an information model. The results from the assembly balancing shows that the proposed assembly strategies have influence in the assembly in terms of the operator utilization and the Product routing in ABBs manual assembly. The process data digitalization has been aligned closely with assembly design since the transformation from the fixed position layout to the Assembly cells or lines have significant influence in the product knowledge across the resources in the assembly. The Lead times can be reduced by 32% in average from 12 weeks to 8 weeks by implementing the proposals of the instruments that are evaluated in the production system. The conclusion of the research shows that it will be more beneficial to implement the methodologies and deploy them across the other instruments for a more effective and smarter production process.ABB 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.
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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.
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Orientador: Antonio Carlos BannwartDissertação (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
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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.
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Thesis (M.S.D.)--Indiana University School of Dentistry, 2009.Title 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).
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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.
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El uso de internet ha facilitado a las editoriales académicas la internacionalización de sus
catálogos, gracias a la digitalización de contenidos y la incorporación de la comunicación
digital en sus procesos habituales. En este contexto, el área de comunicación del Fondo
Editorial PUCP tiene nuevas herramientas para visibilizar su producción y acercarla a su
audiencia, tanto nacional como internacional.
Para ello ha desarrollado un plan de comunicación y marketing —basado en la teoría de
la Comunicación Integrada de Marketing — que contempla un conjunto de estrategias y
acciones orientados a ese fin.Internet 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
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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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La presente investigación tiene como finalidad analizar el uso de la metodología del
Inbound Marketing en la Oficina Central de Admisión e Informes (OCAI) de la Pontificia
Universidad Católica del Perú (PUCP). El estudio se centra desde la metodología del Inbound
Marketing dado que actualmente el área de Admisión de los centros educativos universitarios se
está reinventando y tienen como objetivo la captación de postulantes y a través de la
metodología del Inbound Marketing, los gestores pueden ejecutar la misma respondiendo a las
necesidades de los jóvenes nativos digitales.
La investigación consta de cinco capítulos. En el primero de ellos, se desarrolla el
planteamiento de la investigación, asimismo se incluyen los antecedentes, delimitación de la
investigación, definición del problema, objetivos de la investigación, justificación, preguntas,
limitaciones y viabilidad de la investigación.
En el segundo capítulo se presenta el marco teórico y contextual. Dentro del primer
apartado se despliega información relacionada al Marketing Tradicional, Vivencial e Inbound
Marketing que será la base sobre la cual se desarrollará el análisis de toda la investigación. A su
vez, en el Marco Contextual se presenta información y análisis de data interna de la OCAI
correspondiente a Google Analytics Zona Escolar PUCP, Facebook Insights Zona Escolar
PUCP y encuestas a escolares de visitas guiadas.
En el tercer capítulo, se detalla la metodología que se sigue en el presente trabajo de
investigación, se describe el diseño de la investigación, justificación del diseño, población de la
investigación, proceso de recolección de dato e instrumentos de investigación aplicados.
En el cuarto capítulo se realiza el análisis de la investigación recabada y se presentan los
resultados que responden a los objetivos inicialmente planteados. En primer lugar se muestra el
análisis de la población de estudio desde un análisis cualitativo y la presentación de resultados
desde la metodología del Inbound Marketing.
Al cierre de la investigación en el capítulo cinco se exponen los hallazgos y
recomendaciones a las cuales se llegaron a partir de la investigación realizada.Tesis
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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.
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Melin, Timothy R. "Investigating Wood Welding Parameters Using a Prototype Welding Machine." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/420.
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Understanding how different processing variables influence wood welded bonds is vital if the technique will ever be used to create engineered lumber without using adhesives. A variation of vibration welding, wood welding uses pressure and friction to bond materials together. During welding, heat causes a softening in the wood, a naturally occurring composite material. This softening leads to fiber entanglement and a bond forms upon cooling.
The goal of this research was to investigate several processing aspects of the wood welding procedure. A prototype wood welding machine, designed and fabricated from the ground up, was used to investigate the effects of various welding parameters using birch wood. Wood welds were evaluated on the basis of bond coverage and ultimate shear strength.
Four experiments were performed: welding frequency and duration interaction, grain orientation effects, alternative welding completion metrics, and strength development over time. During the wood welding process, three distinct phenomena were repeatedly observed: smoke creation, welding residue formation, and an audible pitch change. The presence of each was recorded for every wood welded specimen and used later in additional data analysis. Investigating each of the welding phenomena was done in an attempt to better characterize when fusion was achieved at the weld interface.
ImageTool, an image analysis software package, was used to investigate and quantify the often irregular bonds exposed after shear fracture. The results of the various welding variables were analyzed on the basis of shear strength and bond uniformity.
From the birch samples, it was shown that better bonds result from lower welding frequencies and longer welding durations. The grain orientation analysis demonstrated that welding orientation marginally affects the average shear strength of the wood weld. The data from the alternative welding metrics suggests that welding time is not a quality indicator of welding completion (bond coverage). The strength development trials confirmed previous research; wood welds obtain most of their strength in a relatively short period of time.
Douglas fir and poplar both proved to be weldable for the first time, but they were sufficiently weaker than birch. When welding was attempted with Douglas fir under similar pressures used for birch, Douglas fir samples would commonly “washboard.” With reduced welding pressure, Douglas fir formed wood welds more easily.
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Santos, Vasco Leiria Gomes Valadão. "Pump : um ginásio digital." Master's thesis, 2017. http://hdl.handle.net/10400.14/25665.
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As tendências actuais das sociedade são modeladoras não só da forma como nós vivemos, mas também na forma como as marcas definem as suas estratégias. Numa altura em que se registam duas grandes tendências atuais, o uso das tecnologias digitiais, e a procura por um estilo de vida saudável, o ramo do fitness tornou-se um dos sectores de investimento mais apelativos, o que resultou num mercado muito concorrido com muita e variada oferta. Desta forma as marcas viram-.se obrigadas a reinventar-se a inovar para que se possam destacar no mercado.
O projeto Pump, um Ginásio Digital, surge não só na sequência destas tendências e necessidade das marcas, mas também de uma convicção pessoal e de uma falha detectada no mercado.
O presente projeto tem como principal objetivo desenvolver uma proposta de um novo serviço para a cadeia de ginásios Pump que visa não só acompanhar as tendências, mas também servir como factor diferenciador da marca e como uma ferramenta útil, prática e inovador para todos os seus utilizadores. Estamos a falar de uma aplicação móvel que permitirá que os seus utilizadores treinem onde e quando quiserem, de uma forma simples, prática e bastante acessível.
Para o desenvolvimento do projeto foram utilizadas algumas ferramentas metodológicas, como a pesquisa bibliográfica, entrevistas ou focus group, que permitiram recolher toda a informação que serviu de base para a construção e estruturação da ideia proposta.Today'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.
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Lucier, Peter E. "Design of a digital servo-electric pump/motor displacement controller." 1995. http://catalog.hathitrust.org/api/volumes/oclc/34102780.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1995.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 67-68).
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林玉森. "A microprocessor-based digital pump controller for phase-locked servo system." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/74747920283695459963.
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Hwang, 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.
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碩士國立臺北科技大學
電腦與通訊研究所
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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.
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Leandro, Gonçalo Alexandre Raposeiro. "Digital PLL for ISM applications." Master's thesis, 2017. http://hdl.handle.net/10362/30818.
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In modern transceivers, a low power PLL is a key block. It is known that with the
evolution of technology, lower power and high performance circuitry is a challenging
demand.
In this thesis, a low power PLL is developed in order not to exceed 2mW of total power
consumption. It is composed by small area blocks which is one of the main demands.
The blocks that compose the PLL are widely abridged and the final solution is shown,
showing why it is employed. The VCO block is a Current-Starved Ring Oscillator with
a frequency range from 400MHz to 1.5GHz, with a 300μW to approximately 660μW
power consumption. The divider is composed by six TSPC D Flip-Flop in series, forming
a divide-by-64 divider. The Phase-Detector is a Dual D Flip-Flop detector with a charge
pump. The PLL has less than a 2us lock time and presents a output oscillation of 1GHz,
as expected. It also has a total power consumption of 1.3mW, therefore fulfilling all the
specifications.
The main contributions of this thesis are that this PLL can be applied in ISM applications
due to its covering frequency range and low cost 130nm CMOS technology.
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Kumar, Rajesh. "A Radiation Tolerant Phase Locked Loop Design for Digital Electronics." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8547.
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With decreasing feature sizes, lowered supply voltages and increasing operating frequencies,
the radiation tolerance of digital circuits is becoming an increasingly important
problem. Many radiation hardening techniques have been presented in the literature for
combinational as well as sequential logic. However, the radiation tolerance of clock generation
circuitry has received scant attention to date. Recently, it has been shown that in
the deep submicron regime, the clock network contributes significantly to the chip level
Soft Error Rate (SER). The on-chip Phase Locked Loop (PLL) is particularly vulnerable to
radiation strikes. In this thesis, we present a radiation hardened PLL design. Each of the
components of this design-the voltage controlled oscillator (VCO), the phase frequency
detector (PFD) and the charge pump/loop filter-are designed in a radiation tolerant manner.
Whenever possible, the circuit elements used in our PLL exploit the fact that if a gate
is implemented using only PMOS (NMOS) transistors then a radiation particle strike can
result only in a logic 0 to 1 (1 to 0) flip. By separating the PMOS and NMOS devices,
and splitting the gate output into two signals, extreme high levels of radiation tolerance
are obtained. Our design uses two VCOs (with cross-coupled inverters) and charge pumps,
so that a strike on any one is compensated by the other. Our PLL is tested for radiation
immunity for critical charge values up to 250fC. Our SPICE-based results demonstrate that
after exhaustively striking all circuit nodes, the worst case jitter of our hardened PLL is just
37.4 percent. In the worst case, our PLL returns to the locked state in 2 cycles of the VCO clock,
after a radiation strike. These numbers are significant improvements over those of the best
previously reported approaches.
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Hsu, 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 textAbstract:
碩士國立臺北科技大學
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.
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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 textAbstract:
碩士國立暨南國際大學
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.
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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 textAbstract:
碩士國立高雄師範大學
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.
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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 textAbstract:
Indiana University-Purdue University Indianapolis (IUPUI)Accurate 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.
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Loureiro, Henrique Medina. "Endodontia guiada: acesso endodôntico – revisão narrativa." Master's thesis, 2021. http://hdl.handle.net/10284/10373.
Full textAbstract:
A Endodontia Guiada foi introduzida para conferir mais previsibilidade e segurança ao tratamento de dentes cuja condição pulpar se encontr e calcificada. A calcificação pulpar é um dos fatores que tornam o tratamento endodôntico desafiante e possuem a capac idade de compromet er o acesso de instrumentos e soluções irrigantes em toda a extensão do canal radicular, impossibilitando a sua adequada desinfeção.
Este trabalho constitui uma revisão narrativa da Literatura cujo objetivo é perceber como deve ser reali zada esta nova abordagem, em que casos deve ser implementado suas indicações e limitações. Procedeu se à comparação de eficácia entre diferentes tipos de cavidades de acesso, guiadas e ‘não guiadas’, estudo de cavidades minimamente invasivas e qual a vantagem que esta nova técnica vem trazer ao procedimento endodôntico.
Pretende-se, também, que este trabalho seja um guia útil para os Médicos Dentistas.The 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.
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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 textAbstract:
Indiana University-Purdue University Indianapolis (IUPUI)Accurate 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.
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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 textAbstract:
The baobab tree represents a major contribution to rural communities of the south-east lowveld of Zimbabwe. The livelihood base of the study area was largely rain-fed subsistence farming whose production has declined due to frequent droughts. Harvesting of baobab tree products; leaves, fruits and bark fibre, has prospered due to poverty. These products are harvested for food, medicinal use, cash and animal harness. A mixed method approach on collection of data was employed through questionnaires, semi-structured interviews, 48-hour dietary recall and Household Food Insecurity Access Prevalence (HFIAP) template. Sixty-eight households from Wengezi and Gudyanga communities participated in this study. All the respondents from the study area indicated they were involved in using baobab products in one way or the other. According to the information collected by the HFIAP template, 76% of the households were moderate to severe food insecure. Baobab bark harvesting was common in the Gudyanga and harvesters were aware of sustainable way of harvesting it. Value-addition on baobab fruit pulp to make ice-lollies and seeds roasted to produce a coffee substitute was practised by youth projects with the help of a non-governmental organisation. Ninety-five percent of the households in the study area were in support of the idea of possible baobab tree commercial cultivation in the community. The support was in anticipation of job opportunities and reduced food insecurity.Agriculture and Animal Health
M. Sc. (Agriculture)