Дисертації з теми "Load-matching"
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Welton, Sean P. "Load Modulation Through Varactor Tunable Matching Networks." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306865537.
Повний текст джерелаKim, Jaeseok. "Automated matching control system using load estimation and microwave characterization." [Gainesville, Fla.] : University of Florida, 2008. http://purl.fcla.edu/fcla/etd/UFE0022883.
Повний текст джерелаSriramagiri, Gowri Manasa. "Solar Electrolyzer Coupling via Load-Matching and Doping in Cadmium Telluride Solar Cells to Overcome Voltage Limitations." Thesis, University of Delaware, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13428221.
Повний текст джерелаThis dissertation comprises two distinct topics concerning photovoltaics: studying solar electrolyzer performance with a practical consideration of their design and operation, and extrinsic p-type doping in thin-film CdTe solar cells using Sb for improved voltage output.
Solar fuel generation via water and CO2 reduction using photovoltaics has witnessed considerable growth since the identification of photocatalysis four decades ago. Numerous photovoltaic-driven electrochemical cells (PV-ECs) and photoelectrochemical cells (PECs) with efficiencies reaching 30% for H 2O reduction and 10% for CO2 reduction have been reported. We will discuss the many benefits of a PV-EC system over the PEC approach. This dissertation discusses the implementation of a high-efficiency PV-EC using silicon solar cells and a flow-cell CO2 electrolyzer (in collaboration with Prof. Feng Jiao group from UDel’s Center for Catalytic Science and Technology). With 25 cm² electrode area, this is the largest CO2 electrolysis device yet reported that exhibited > 6.5% efficiency at operating currents in excess of 1A. The development of a model to optimize the coupling of such devices and to simulate annual field performance will be presented. Improvement in fuel generation by > 20% is demonstrated by employing power electronic devices to continuously optimize the PV-EC operating point for maximum power coupling despite variable sunlight and temperature.
Polycrystalline thin-film CdTe/CdS heterojunction solar cells are the leading commercial competitor to c-Si solar modules. While having demonstrated good performance at low cost and large scale, the potential to exceed 25% efficiency by enhancing open circuit voltage (Voc), from present ~0.9V to the near-ideal 1.1 V, is possible with carrier concentrations exceeding 5 × 1016 cm–3 while retaining bulk minority carrier lifetime > 10 ns. State-of-the-art intrinsic CdTe solar cells, wherein n- or p-type doping is achieved through native point defect (V Cd) control during film growth, are limited to acceptor concentration levels of < 1015 cm–3. Bridging the Voc gap through extrinsic doping of polycrystalline CdTe films with Sb during film growth using vapor transport deposition technique is examined. Applying device characterization and analysis techniques to cells processed with different post-growth device treatments for dopant activation shows where optimization effort is needed. Admittance and current-voltage measurements indicate that despite significant improvement in acceptor density (up to 3 × 10 15 cm–3), Voc is limited to < 600 mV due to increased defect density and thus reduced minority carrier lifetime.
Yang, Chun-Ju. "The Design Methodology and Optimization of Varactors Based Tunable Matching Network for Power Amplifiers with Load Adaptation Technique." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308320281.
Повний текст джерелаARAÚJO, Tiago Brasileiro. "Uma abordagem em paralelo para matching de grandes ontologias com balanceamento de carga." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1316.
Повний текст джерелаMade available in DSpace on 2018-08-01T19:28:54Z (GMT). No. of bitstreams: 1 TIAGO BRASILEIRO ARAÚJO - DISSERTAÇÃO PPGCC 2016..pdf: 18742851 bytes, checksum: 92b3eefe5e78ab27784255e850871df9 (MD5) Previous issue date: 2016-03-07
Atualmente, o uso de grandes ontologias em diversos domínios do conhecimento está aumentando. Uma vez que estas ontologias podem apresentar sobreposição de conteúdo, a identificação de correspondências entre seus conceitos se torna necessária. Esse processo é chamado de Matching de Ontologias (MO). Um dos maiores desafios do matching de grandes ontologias é o elevado tempo de execução e o excessivo consumo de recursos de computacionais. Assim, para melhorar a eficiência, técnicas de particionamento de ontologias e paralelismo podem ser empregadas no processo de MO. Este trabalho apresenta uma abordagem para o Matching de Ontologias baseado em Particionamento e Paralelismo (MOPP) que particiona as ontologias de entrada em subontologias e executa as comparações entre conceitos em paralelo, usando o framework MapReduce como solução programável. Embora as técnicas de paralelização possam melhorar a eficiência do processo de MO, essas técnicas apresentam problemas referentes ao desbalanceamento de carga. Por essa razão, o presente trabalho propõe ainda duas técnicas para balanceamento de carga (básica e refinada) para serem aplicadas junto à abordagem MOPP, a fim de orientar a distribuição uniforme das comparações (carga de trabalho) entre os nós de uma infraestrutura computacional. O desempenho da abordagem proposta é avaliado em diferentes cenários (diferentes tamanhos de ontologias e graus de desbalanceamento de carga) utilizando uma infraestrutura computacional e ontologias reais e sintéticas. Os resultados experimentais indicam que a abordagem MOPP é escalável e capaz de reduzir o tempo de execução do processo de MO. No que diz respeito às técnicas de balanceamento de carga, os resultados obtidos mostram que a abordagem MOPP é robusta, mesmo em cenários com elevado grau de desbalanceamento de carga, com a utilização da técnica refinada de balanceamento de carga.
Currently, the use of large ontologies in various áreas of knowledge is increasing. Since, these ontologies can present contents overlap, the identification of correspondences among their concepts is necessary. This process is called Ontologies Matching (OM). One of the major challenges of the large ontologies matching is the high execution time and the computational resources consumption. Therefore, to get the efficiency better, partition and parallel techniques can be employed in the MO process. This work presents a Partition-Parallelbased Ontology Matching (PPOM) approach which partitions the input ontologies in subontologies and executes the comparisons between concepts in parallel, using the framework MapReduce as a programmable solution. Although the parallel techniques can get the MO efficiency process better, these techniques present problems concerning to the load imbalancing. For that reason, our work has proposed two techniques to the load balancing - the basic and the fine-grained one - which are supposed to be applied together with the PPOM approach, in order to orientate the uniform distribution of the comparisons (workload) between the nodes of a computing infrastructure. The performance of the proposed approach is assessed in different settings (different sizes of ontologies and degrees of load imbalancing) using a computing infrastructure and real and synthetic ontologies. The experimental results have indicated that the PPOM approach is scalable and able to reduce the OM process execution time. Referring to the load balancing techniques, the obtained results have shown that the PPOM approach is robust, even in settings with a high load imbalancing, with the fine-grained load balancing technique.
Danilovic, Milisav. "Active Source Management to Maintain High Efficiency in Resonant Conversion over Wide Load Range." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/76618.
Повний текст джерелаPh. D.
Alam, Mohammad Saad. "Real-time maximum power tracking and robust load matching of a stand-alone photovoltaic system a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=1756844361&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1280170042&clientId=28564.
Повний текст джерелаAcimovic, Igor. "Contributions to the Design of RF Power Amplifiers." Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24406.
Повний текст джерелаSmith, Nathanael J. "Novel Closed-Loop Matching Network Topology for Reconfigurable Antenna Applications." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1387733249.
Повний текст джерелаAmrhein, Andrew Aloysius. "Induction Heating of Aluminum Cookware." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/77400.
Повний текст джерелаMaster of Science
Connor, Mark Anthony. "Design of Power-Scalable Gallium Nitride Class E Power Amplifiers." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1405437893.
Повний текст джерелаMastrocinque, Morgan M. "Epitope-based Re-matching of Donor-Recipient Pairs for Kidney Graft Allocation." Bowling Green State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu16171080745974.
Повний текст джерелаLiut, Daniel Armando. "Neural-Network and Fuzzy-Logic Learning and Control of Linear and Nonlinear Dynamic Systems." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/29163.
Повний текст джерелаPh. D.
Abu-Aisheh, Zeina. "Approches anytime et distribuées pour l'appariment de graphes." Thesis, Tours, 2016. http://www.theses.fr/2016TOUR4024/document.
Повний текст джерелаDue to the inherent genericity of graph-based representations, and thanks to the improvement of computer capacities, structural representations have become more and more popular in the field of Pattern Recognition (PR). In a graph-based representation, vertices and their attributes describe objects (or part of them) while edges represent interrelationships between the objects. Representing objects by graphs turns the problem of object comparison into graph matching (GM) where correspondences between vertices and edges of two graphs have to be found
Bolton, Amy. "IMMEDIATE VERSUS DELAYED FEEDBACK IN SIMULATION BASED TRAINING: MATCHING FEEDBACK DELIVERY TIMING TO THE COGNITIVE DEMANDS OF TH." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3240.
Повний текст джерелаPh.D.
Department of Psychology
Sciences
Psychology
Ronaghzadeh, Amin. "Improving The Efficiency Of Microwave Power Amplifiers Without Linearity Degradation Using Load And Bias Tuning In A New Configuration." Phd thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615730/index.pdf.
Повний текст джерелаcon
Šmarda, Marek. "Miniaturní anténa pro mobilní aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219975.
Повний текст джерелаTseng, Yu-Chiung, and 曾玉瓊. "Routing-Based LTL Load Matching E-Marketplace with Web-GIS." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/64764508401922948429.
Повний текст джерела龍華科技大學
商學與管理研究所碩士班
94
There are many road freight-matching web sites in several countries nowadays. Most of them serve as B2B e-marketplace or exchange and make revenue from membership or transaction fee. The matching procedures start with both sides of the shipper and carriers keying in the service options and customers’ requirement. However, in most cases, only one-to-one matching pairs are provides on these sites. Nevertheless, the customers make their decision from the word-written data displayed in the web pages and matched results were chose by users themselves. From the above points, the whole decision process is obviously simplified and only information querying but not decision supporting. Then, the purpose of this research is to provide a more efficient load matching platform for specified freighter, especially Less-than-Truckload (LTL) truckers and the house-moving vendors which have serious problems of dead loads.This research develops an improvement procedure on the web site technique and the algorithm to match the actual requirement. For web site technique improvement, not only include general functions like data addition, data deletion, and data modification, we also use Web-Geographical Information System(Web-GIS) to perform spatial querying among options and as the user-interface to present the matching results based on the spatial-matching rules. The major functions of Web-GIS are spatial data input, data management, data analysis, and data output. Besides, easy accessibility, platform independency, cost-effectiveness, and user-friendly are all its advantages. We will use all of the above functions and properties in this research by utilizing the spatial analysis to reinforce the routing-based matching results. They would be much easier using through the interactive graphical user interface. As to the algorithm, since this research focuses on LTL operation and real customers’ requirements are dynamical, we adopt a heuristic approach to develop solution algorithm for quick computing and solving such a pickup-and-delivery problem with ILOG OPL and Visual C++ on PC.The sample questions are based on Taipei city e-map. We transfer the actual road network to the logical format that computers can identify and compute, and, will design several customer posting loads and some empty trucks information to simulate the real situation. Finally, the modified processes and empirical testing results would be logged and compared to evaluate the performance of these two load-matching methods.
Pei-YiCai and 蔡沛屹. "Axial Flow Fan Motor Design with Load Analysis and Matching." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/xrk59m.
Повний текст джерела國立成功大學
電機工程學系
105
At the moment, the general motor design methods usually adopt the long operation at the using point as the design criterion. This research is targeted at the motor used in axial-flow fan and the general cooling system that required long operation time, and thus the permanent magnet brushless DC motor is utilized. According to the performance characteristics of the fan and also the influence factors in practical applications, such as air temperature, humidity, pressure and density, the using point of the practical application actually will not be a fixed one. Therefore, this paper firstly analysed the performance characteristics of the axial-flow fan by load analysis, and then the analysed result is adopted in motor matching design to further realize the motor matching design and improve motor efficiency. The finite element simulation software is conducted in the design and analysis, the prototype is established, and finally the results of axial-flow fan of practical applications is compared and verified to be in line with the expected target. Motor design of simulation results, accord the load analysis results of axial-flow fan. And the results of the measured, the high efficiency range matched the characteristic speed range of the axial-flow fan, speed at 5600 rpm to 7200 rpm, and the highest efficiency point raised by 9%. Establish process matching design of permanent magnet brushless DC motor design and load analysis results, matching design of motor and improve the efficiency of motor applications. Key words: Axial flow fan, fan motor, load analysis, BLDC motor, matching design.
Lopes, Rui Miguel Amaral. "Extending nearly Zero-Energy Buildings Load Matching Improvement to Community-Level." Doctoral thesis, 2017. http://hdl.handle.net/10362/29113.
Повний текст джерелаSidhu, Manitpal S. "A PSO based load-rebalance algorithm for task-matching in large scale heterogeneous computing systems." 2013. http://hdl.handle.net/1993/21692.
Повний текст джерелаWang, Yunfei. "Advanced load shedding scheme for voltage collapse prevention." Phd thesis, 2011. http://hdl.handle.net/10048/1945.
Повний текст джерелаPower Engineering and Power Electronics
Liaw, Chong-Zhi. "A high power interior permanent magnet alternator for automotive applications." Thesis, 2013. http://hdl.handle.net/2440/83587.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2013
González, García José Luis. "Graph Partitioning for the Finite Element Method: Reducing Communication Volume with the Directed Sorted Heavy Edge Matching." Doctoral thesis, 2019. http://hdl.handle.net/11858/00-1735-0000-002E-E625-0.
Повний текст джерелаRavindra, Kumudhini. "Community Microgrids for Decentralized Energy Demand-Supply Matching : An Inregrated Decision Framework." Thesis, 2011. http://etd.iisc.ernet.in/2005/3911.
Повний текст джерелаHsu, Chia-Hsin, and 徐嘉欣. "High Efficiency Buck Converter with Wide Load Current Range Using Dual-mode of PWM and PSM and A 12-bit 100 MS/s Current Steering DAC Using Dynamic Element Matching and Return to Zero Techniques." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d652de.
Повний текст джерела國立中山大學
電機工程學系研究所
107
The Implementation of Signal Processing Chips”. Particularly, these topics applied the photonic gyro system are high-efficiency buck converter with wide load current range using dual-mode of PWM and PSM and 12-bit 100 MS/s current steering DAC using dynamic element matching and return to zero techniques. They are implemented using TSMC 0.35 um Mixed-Signal 2P4M Polycide 3.3/5 V and TSMC 45 nm CMOS LOGIC General Purpose Superb (40G) ELK Cu 1P10M 0.9/2.5 V processes, respectively. The proposed high efficiency buck converter is featured with integration of PWM and PSM modes to increase the efficiency given a wide load current range. The peak efficiency is 96.76 % when the load current is 1000 mA, while the efficiency in the load current range from 10 mA to 1000 mA is over 94.80 %. In addition, the proposed design accurately switches between heavy load current and light load current by a well-designed logic decoder circuit. A dynamic element matching and return to zero techniques are used to realize a 12- bit 100 MS/s current steering DAC with a precision of 1 to 10◦/h for the Heterogeneous Silicon Photonics Gyroscope. A pseudo-random number generator carries out the random selection of current sources to reduce the mismatch among these current sources caused by layout issues and also reduce the delay by using compact return to zero technique. Not only is the circuit area greatly reduced, the SFDR is also enhanced to 61 dB at 100 MS/s.
Gonçalves, Cristiano Ferreira. "Load insensitive radio frequency power amplifiers." Doctoral thesis, 2021. http://hdl.handle.net/10773/33222.
Повний текст джерелаOs amplificadores de potência de estado sólido (SSPAs) evoluíram significativamente nas últimas décadas, principalmente devido à utilização de novas tecnologias de transístores, como os transístores de alta mobilidade (HEMTs) de nitreto de gálio (GaN), de ferramentas muito avançadas de projeto assistido por computador (CAD) e de algoritmos de pré-distorção digital (DPD) muito evoluídos. Isto levou a uma melhoria de desempenho considerável, em termos de eficiência energética, potência de saída e linearidade. Normalmente, para obter estes níveis de desempenho, os engenheiros projetam os amplificadores permitindo que os transístores utilizados operem muito perto do seu limite físico de funcionamento seguro e considerando que vão operar para uma carga fixa. No entanto, os amplificadores projetados são utilizados em diversas aplicações industriais e/ou telecomunicações e, em alguns casos, como por exemplo fornos micro-ondas ou estações base 5G, a sua carga de saída pode variar devido a várias causas, que podem ser previsíveis ou imprevisíveis. Neste cenário não ideal, os transístores utilizados operam para cargas não ótimas e o desempenho dos amplificadores pode ser muito degradado. Além disso, em projetos muito otimizados, onde os transístores são operados perto do seu limite de funcionamento seguro, a sua durabilidade pode ser reduzida ou, em casos extremos, podem até ser permanentemente danificados. Portanto, para melhorar o desempenho dos amplificadores em cenários de carga variável, são necessárias novas arquiteturas e/ou técnicas que visam reduzir a variação da carga vista pelos transístores utilizados. Esta tese apresenta várias estratégias para melhorar a insensibilidade dos amplificadores em relação à variação de carga. As técnicas apresentadas são baseadas em malhas de adaptação dinâmicas (TMNs) e na variação da tensão de alimentação dos amplificadores. As malhas de adaptação desenvolvidas permitiram reduzir a variação de carga vista pelo amplificador e a variação da sua tensão de alimentação permitiu melhorar o desempenho para operação com cargas não ótimas. Estas abordagens foram testadas e validadas em amplificadores baseados num só transístor, e, posteriormente, com base nas suas vantagens e desvantagens, a técnica mais promissora – a modulação da tensão de alimentação – foi selecionada para o projeto de um amplificador Doherty, que é imprescindível para telecomunicações. Além disso, como em algumas aplicações a variação da carga de saída pode ser imprevisível, também desenvolvemos um sistema completo que inclui um circuito de medida de impedância e compensação do desempenho do amplificador em tempo real.
Programa Doutoral em Engenharia Eletrotécnica