Дисертації з теми "Generator Q"
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Goman, Anna. "Waveform Generator Implemented in FPGA with an Embedded Processor." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2026.
Повний текст джерелаCommunication and digital signal processing applications of today are often developed as fully integrated systems on one single chip and are implemented as application specific integrated circuits using e.g. VLSI technology. As the systems are getting more and more complex in terms of speed and performance the chip size and the design time tend to increase rapidly. This will result in search for cheaper and less time consuming alternatives. One alternative is field programmable gate arrays, so called FPGAs. The FPGAs are getting faster, cheaper and the number of gates increases all the time. A long list of ready to use functional blocks so called intellectual property (IP) blocks can be used in FPGAs. The latest FPGAs can also be bought with one or more embedded processors, in form of hard processor cores or as licenses for soft processor cores. This will speed up the design phase and of course also decrease the crucial time to market even more.
The purpose of this master’s thesis was to develop a waveform generator to generate a sine signal and a cosine signal, I and Q, used for radio/radar applications. The digital signals should have an output data rate of at least 100 MHz. The digital part of the system should be implemented in hardware using e.g. an FPGA. To convert the digital signals to analog signals two D/A converters are used. The analog signals, I and Q, should have a bandwidth of 1 MHz - 11 MHz.
The waveform generator was developed and implemented using a Virtex II FPGA from Xilinx. An embedded microprocessor within the FPGA, MicroBlaze, in form of a soft processor core was used to control the system. A user interface program running on the microprocessor was also developed. Testing of the whole system, both hardware and software, was done. The system is able to generate digital sine and cosine curves of an output data rate of 100 MHz.
Shen, Baike 1972. "Slip frequency phase lock loop (PLL) for decoupled P-Q control of doubly-fed induction generator (DFIG)." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81568.
Повний текст джерелаThe accuracy of the Slip Frequency Phase Lock Loop in speed estimation is evaluated; the origin of a shortcoming (small phase lag) located and compensated for.
The Slip Frequency Phase Lock Loop (PLL) and a gamma-delta Axes Aligner are then evaluated as parts of the decoupled P-Q control of a wind turbine driven doubly-ed induction generator. The research succeeds in realizing robust decoupled P-Q control, that is one in which the generator parameters do not have to be known precisely and can have minor variations such as drifts with temperature. The system has been successfully tested for optimal wind power acquisition.
Chen, Jian. "Nonlinear adaptive control of permanent magnet synchronous generator based wind turbine : a perturbation estimation approach." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/2007963/.
Повний текст джерелаGogas, Kyriakos. "Design of a robust speed and position sensorless decoupled P-Q controlled doubly-fed induction generator for variable-speed wind energy applications." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99762.
Повний текст джерелаThe objectives of this thesis are to implement a decoupled P-Q control of a DFIG that does not rely on mechanical sensors and to design a speed and position sensorless algorithm that is robust to variations of the values of the machine parameters. The sensorless DFIG control algorithm presented in this thesis is based on a modified phasedlock loop with an improved positioning algorithm. With the measured stator voltages, stator and rotor currents, the speed and position of the DFIG are estimated. The speed is estimated independent of machine parameters, which results in a significant improvement in speed control robustness to parameter variations. In addition, the algorithm avoids using differentiation, which significantly improves its immunity to noise and does not require the measurement of the rotor voltages. Also, it is shown that the positioning algorithm has an improved operation in generator mode. Although the accuracy of the positioning algorithm is depended on machine parameters; it is shown with the designed controller that the P-Q decoupled control is robust to changes of machine parameters. Theoretical and simulation results are validated on an experimental setup.
Strudwick, Scott David. "A trend analysis expert system for the remote condition monitoring of diesel generators." Thesis, University of Greenwich, 1993. http://gala.gre.ac.uk/8704/.
Повний текст джерелаNguyen, Phuong. "Ethnic gap, household businesses and social networks in Vietnam The role of Social Networks on Household Business Performance in Vietnam: A qualitative assessment." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLED080.
Повний текст джерелаOver the past two decades, the two vulnerable groups of ethnic minorities and household businesses have participated in the economic growth but could not benefit from the growth process as much as the other groups in Vietnam. The inadequate inclusiveness of these two groups in the economic growth calls for an investigation of the ethnic gap and household businesses' performance with a lens of social networks. This study aims to examine the role of social networks, using a Q-squared method to analyze an original dataset, which combined both the quantitative and qualitative datasets on social networks of household businesses. In doing so, the study employs an innovative instrument of being the first son in the family. Chapter 1 measures and analyses the main drivers of the ethnic gap over the last ten years. Chapter 2 identifies the causal effects of social networks on household businesses' performance. Chapter 3 presents a qualitative analysis of the impact of social networks on business performance by the content and the strength of social relationships, and the business phase
Koppula, Sreedevi. "Automated GUI Tests Generation for Android Apps Using Q-learning." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984181/.
Повний текст джерелаFelgate, Nigel Stephen. "Efficient blue generation from all-solid-state Q-switched Nd:YAG lasers." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/41527/.
Повний текст джерелаTjörnhammar, Staffan. "Pulsed Yb:KYW laser and UV generation." Thesis, KTH, Laserfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-51595.
Повний текст джерелаI detta examensarbete utformades och konstruerades en pulsad UV-laser. Dessutom undersöktes effekterna av absorption i ett volymbraggitter. Som laserkristall användes Yb:KYW vilken pumpades med en diodlaser. Lasring skedde vid 1029,2 nm med en bandbredd av 0,23 nm genom att ett volymbraggitter användes som inkopplingsspegel för att kontrollera spectrumet. Pulser generades genom passiv Q-switching med en Cr:YAG som mättnadsbar absorbator inne i kaviteten. Den maximala toppeffekten var 3,8 kW vid 0.35 W medeleffekt, 4 kHz repetitionsfrekvens och en pulsbredd på 16 ns. Den maximala medeleffekten var 1.3 W med en toppeffekt på 3,8 kW, 20 kHz repetitionsfrekvens och en pulsbredd på 20 ns. Genom frekvensdubbling i en LBO kristall genererades grönt ljus vid våglängden 514,7 nm. Den maximala medeleffekten var 130 mW med en optisk verkningsgrad från den fundamentala våglängden på 10 %. Sedan blandades det infraröda och det gröna ljuset i en andra LBO kristall för att generera UV-ljus, vid en våglängd om 343 nm. Den högsta medeleffekten av UV var cirka 23 mW med en optisk verkningsgrad, med avseende på det gröna ljuset, på ungefär 20%. En begränsning av laser var att Cr:YAG kristallen blektes inte enbart av lasern utan även av pumpen. Detta resulterade i fallande toppeffekt med ökande pumpeffekt, vilket begränsade effektiviteten i den ickelinjära konverteringen. Termisk fraktur på Cr:YAG kristallen var en begränsande faktor för cirkulerande medeleffekten i kaviteten, medan brännskador på Yb-kristallens antireflexbehandling begränsade toppeffekten. Effekterna i en laser vid användning av en alltför hög effekt i förhållande till nivån av absorption i ett volymbraggitter studerades också. Effekterna av både resonanta och ickeresonanta strålar undersöktes. Eftersom intensiteten av en resonant ståle minskar ungefär exponentiellt i ett volymbraggitter kommer temperaturen, på grund av absorption, fördelas ojämnt i propageringsriktningen. Detta resulterar i olika termiska expansion med en längsgående varierad gitterperiod som följd. Detta orsakar en minskning utav både reflektiviteten och den spektrala selektiviteten. Reflektiviteten i gittret som användes i dessa experiment minskade från 99,4 % till 93 %. Dessutom visades det experimentellt att om ett volymbraggitter absorberar en icke försumbar del av en ickeresonant stråle kommer värmebelastning att deformera volymenbraggittret. Därför är det inte lämpligt att använda ett sådant gitter som inkopplingsspegel i en laser.
Gugler, Klaus, Adhurim Haxhimusa, Mario Liebensteiner, and Nora Schindler. "Investment under Uncertainty in Electricity Generation." WU Vienna University of Economics and Business, 2016. http://epub.wu.ac.at/5177/1/wp234.pdf.
Повний текст джерелаSeries: Department of Economics Working Paper Series
Baker, Shelley Louise. "Use of a direct, positive selection strategy to generate improved prodrug-activating enzymes for cancer gene therapy." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1443/.
Повний текст джерелаWalker, John R. "Investigation of isoform-specific fruitless mutants generated by gene targeting in Drosophila melanogaster." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/1283/.
Повний текст джерелаSlavinskis, Nerijus. "Short pulse q-switched longitudinally diode pumped solid state minilasers: generation, characterization and application." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110630_134119-87467.
Повний текст джерелаDisertacija skirta diodais kaupinamų kietojo kūno lazerių su aktyviąja ir pasyviąja kokybės moduliacija generacijos dinamikos detalesnei skaitmeninei analizei, lazerio impulsų laikinių ir erdvinių parametrų charakterizavimui ir sukurtų minilazerių panaudojimo galimybių demonstracijai. Generacijos dinamikos detalesniai skaitmeniniai analizei, darbe pristatomas sukurtas bėgančiųjų bangų modelis, kuriame atsižvelgiama ne tik į daugelį procesų vykstančių lazerio aktyviajame elemente, bet ir į rezonatoriaus konfigūraciją bei kaupinimo šaltino parametrus. Pateikiami skaitinio modeliavimo rezultatai demonstruojantys šio modelio privalumus lyginant su dažniausiai naudojamu taškiniu lazerio modeliu. Naudojant taškinį lazerio modelį yra nagrinėjama generuojamų impulsų laikinio tirtėjimo problema pasyvios kokybės moduliacijos lazeriuose ir pasiūlyti mažinimo būdai naudojant skirtingus kaupinimo būdus. Darbe taip pat pateiktas naujas, antraisiais momentais pagrįstas, pluošto charakterizavimo judančiu peiliu metodas. Nagrinėjamos lazerių impulsų spūdos galimybės tetrachlorido CCL4 skystyje ir pademonstruota, kad naudojant užkrato signalą galima gauti trumpesnius (< 60 ps) ir stabilesnius optinius impulsus. Darbe pademonstruotos sukurtų minilazerių pritaikymo galimybės: aprašomas netiesinio lūžio rodiklio kvarciniame stikle matavimas Z-skenavimo metodu ir gautų duomenų apdorojimo procedūra įskaitant naudojamų impulsų erdvinę ir laikinę formą; aprašomi eksperimentai, kuriuose sukurti... [toliau žr. visą tekstą]
Koçak, Murat. "The Application of Q Methodology to Generate A Functional Typology of Terrorist Organizations in Turkey." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1286681075.
Повний текст джерелаDi, Silvestre Olga. "Rappresentazioni LGBTQI+ nelle serie televisive americane: i casi di ‘Transparent’, ‘Pose’ e ‘The L World: Generation Q’." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Знайти повний текст джерелаShakely, Yar. "«Jajaja es q son para comerselos…» : - Ortografía de actualizaciones de estado en Facebook." Thesis, Umeå universitet, Institutionen för språkstudier, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-99877.
Повний текст джерелаLonghi-Browne, Cassandra W. "Using Caenorhabditis elegans as a novel expression system for the generation of recombinant Teladorsagia circumcincta vaccine candidates." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5547/.
Повний текст джерелаOk, Ali Ozgun. "Accuracy Assessment Of The Dem And Orthoimage Generated From Aster." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606588/index.pdf.
Повний текст джерелаLeigh, Matthew. "HIGH POWER PULSED FIBER LASER SOURCES AND THEIR USE IN TERAHERTZ GENERATION ." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193797.
Повний текст джерелаKneis, Christian. "Investigation of mid-infrared supercontinuum generation in soft-glass fibers from a Q-switched mode-locked 2 mm fiber laser." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0135/document.
Повний текст джерелаThis thesis reports about the investigation of high power supercontinuum (SC)generation between 2 mm and 5.5 mm. A Q-switched mode-locked (QML) thulium (Tm3+)-doped fiber laser has been developped to pump different nonlinear fibers. The fiber laserprovided in continuous wave regime an output power of 70 W. In QML operation, 26 W havebeen obtained with Q-switched repetition rates of 180 kHz or higher. The highest energy of theQS envelopes has been 166 mJ with 66 mJ contained in the most-energetic ML pulses, whichhave been surrounded by Gaussian-like pedestals with temporal widths around 2.5 ns. On topof these pedestals, very short temporal peaks with pulse durations around 15 ps appeared. Thehighest achieved peak power of a pedestal has been 25 kW. The beam parameter product M2of the fiber laser has been measured in different operational regimes and resulted always in anexcellent value around 1.2.The highest SC output power level from a ZBLAN fiber has been 7.8 W. In total, 69%/43%/30%/16.5% of the transmitted SC output radiation could be converted beyond the wavelengthof 2.15 mm/2.65 mm/3.1 mm/3.5 mm, respectively, with the broadest output spectrum from theZBLAN fiber exceeding 4.2 mm. The InF3 fiber provided a total output power of 0.8 W withan output spectrum up to 2.95 mm.Successful broadening of the wavelength-limited SC output from the ZBLAN fibers has beenachieved with all three investigated chalcogenide fibers with as much as 20 mW of outputpower by using an arsenic selenide fiber. The output spectrum exceeded 4.9 mm
Kavanaugh, Karen Kavanaugh. "Gamification Techniques and Millennial Generation Philanthropy." ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/3455.
Повний текст джерелаKadwani, Pankaj. "Pulsed Tm-Fiber Laser for Mid-IR Generation." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5955.
Повний текст джерелаPh.D.
Doctorate
Optics and Photonics
Optics and Photonics
Optics
Chamas, Ibrahim. "The Analysis and Design of Phase-tunable Low-Power Low-Phase-Noise I/Q Signal Sources for Analog Phase Calibrated Transceivers." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/102076.
Повний текст джерелаPh.D.
While resting in bed due to illness, the Dutch scientist Christiaan Huygens keenly observed that the pendulums of two clocks hanging on the wall moved synchronously when the clocks were hung close to each other. He concluded that these two oscillatory systems were forced to move in unison by virtue of mechanical coupling through the wall. In essence, each pendulum injected mechanical vibrations into the wall that was strong enough to lock the adjacent pendulum into synchronous motion. Injection locking of oscillatory systems plays a critical role in communication systems ranging from frequency division, to generating clocks (oscillators) with finer phase separation, to the synthesis of orthogonal (quadrature) clocks. All communication systems have the same basic form. Firstly, there will some type of an information or data source which can be a keyboard or a microphone in a smartphone. The source is connected to a receiver by some sort of a channel. In wireless systems, the channel is the air medium. Moreover, to comply with the FCC and 3GPP requirements, data can only be transmitted wirelessly within a predefined set of frequencies and with stringent emission requirements to avoid interference with other wireless systems. These frequencies are generated by high fidelity clock sources, also known as oscillators. Consider a group of people sharing the same room and hence the same channel want to share information. Without regulating the “loudness” of each communicating ensemble, the quality of communication can be severely impaired. Moreover, it is to be expected that information can be shared more efficiently if each pair is allocated non-overlapping timeslots – speak when others are quiet. Called time orthogonality, all wireless systems require precise orthogonal (quadrature) clock sources to improve the communication efficiency. The precision of quadrature clocks is determined by the amplitude and phase accuracy. This dissertation takes a deep dive into the analysis and implementation of high accuracy quadrature (I/Q) clock sources using the concept of injection locking. These I/Q clocks or oscillators, also known as quadrature voltage controlled oscillators (QVCOs), have gained enormous popularity in the last decade. The first part of this work focuses on the analysis and modeling of QVCOs. The analysis focuses on understanding the oscillator basic performance characteristics, and on examining the quadrature accuracy in presence of process variations. New design parameters and circuit insight are developed and a generalized first order linear model and a one-port model are proposed. A qualitative and quantitative study of the effect of mismatch on the phase imbalance and amplitude error is presented. Particularly, closed-form intuitive expressions of the phase imbalance and amplitude error are derived and verified via circuit simulation. Based on our understanding of the various mechanisms affecting the quadrature accuracy, the second part of this work introduces a very efficient quadrature phase calibration technique based The phase-tunable QVCO (PT-QVCO) achieves an ultra-wide I/Q phase tuning range without affecting the oscillator other performance metrics. The proposed topology was successfully verified in silicon using a 5GHz prototype. The third part of this work introduces a new low-power, low-phase-noise injection coupled QVCO (IC-QVCO) topology. An X-band IC-QVCO prototype was successfully verified in a 0.18m RF CMOS process. In the fourth part of this work, we explore the implementation of QVCOs as potential I/Q sources at millimeter-wave (MMW) frequencies. Among the several design challenges that emerge as the oscillator frequency is scaled into the MMW band, precise quadrature synthesis and adequate frequency tuning range are among the hardest to achieve. After describing the limitation of using an conventional frequency tuning techniques, we propose an alternative approach based on the fundamental operation of QVCOs that outperforms existing solutions.
Gezer, Dogan. "A Proposed Rule For The Interconnection Of Distributed Generation And Its Economic Justification." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611242/index.pdf.
Повний текст джерелаresponse for being backup generation against the fluctuations in wind generation is analyzed by a mid-term dynamic model of the power system. A secondary control mechanism for the integration of wind power is suggested. Finally, an economic comparison between the interconnection alternatives of hydropower and photovoltaic power plants at the distribution busbar of the 154/36 kV substation and the 36 kV feeder is done by present worth analysis using the up to date power plant costs and incentives.
Yilmaz, Ozge. "Hazardous Waste Inventory Of Turkey." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607041/index.pdf.
Повний текст джерела5,110,000 t/yr of hazardous wastes are being generated in Turkey. 1,790,000 &ndash
2,252,000 t/yr of these are classified as absolute entries and 3,146,000 &ndash
3,160,000 t/yr of hazardous wastes are minor entries. It is observed that highest generation occurs from mining and thermal processes which involve high amounts of minor entries. Beside these industries highest generation occurs from wood preservation. Per capita hazardous waste generation is estimated as 30 &ndash
77 kg/capita/yr which is in accordance with per capita generation range of EU. Highest hazardous waste generation occurs from Marmara Region with 527,730 t/yr followed by Aegean (524,580 t/yr), Central Anatolia (481,820 t/yr), Black Sea Region (277,850 t/yr), Mediterranean (211,580 t/yr), Southeast Anatolia (58,290 t/yr) and Eastern Anatolia (36,520 t/yr) excluding minor entries from mining industry and thermal processes. The trends in hazardous waste generation and GDP from manufacturing industry show the same trend. Contribution of regions are in the same order both in hazardous waste generation and GDP.
Keser, Saniye. "Investigation Of The Spatial Relationship Of Municipal Solid Waste Generation In Turkey With Socio-economic, Demographic And Climatic Factors." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611575/index.pdf.
Повний текст джерелаniques are utilized. Non-spatial technique is ordinary least squares (OLS) regression while spatial techniques employed are simultaneous spatial autoregression (SAR) and geographically weighted regression (GWR). The independent variables include socio-economic, demographic and climatic indicators. The results show that nearer provinces tend to have similar solid waste generation rate. Moreover, it is shown that the effects of independent variables vary among provinces. It is demonstrated that educational status and unemployment are significant factors of waste generation in Turkey.
Mariotto, Lenois. "Avaliação da segurança da operação de sistemas elétricos de potência considerando os limites de estabilidade angular e de tensão." Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/3653.
Повний текст джерелаEste trabalho apresenta novos métodos analíticos e computacionais para a avaliação da segurança da operação de sistemas elétricos de potência considerando os Limites de Estabilidade Angular e de Tensão. No tema Estabilidade Angular, desenvolveu-se um método para a estimativa de margens de segurança transitória baseado em técnicas de redução de redes e geradores coerentes. O desvio de velocidade angular foi o critério usado para identificar geradores que oscilam juntos. A redução foi realizada substituindo-se dois grupos de geradores coerentes por um sistema Equivalente Máquina-Barra Infinita. Com este equivalente, os tempos críticos de abertura de falta e as margens de segurança são calculados com auxílio do Critério das Áreas Iguais. Os resultados encontrados foram muito satisfatórios quando comparados com aqueles obtidos por outros métodos, especialmente os que utilizam a função energia como função de Lyapunov. O método também foi aplicado para a estimativa de margens de segurança e tempos críticos de abertura de falta, em sistemas de potência na presença de geração eólica. Foi demonstrado que o método proposto é capaz de selecionar contingências críticas que precisam ser estudadas com modelos completos de modo a reproduzir o comportamento real do sistema elétrico. Com relação à Estabilidade Tensão, foi desenvolvido um método analítico e computacional para análise de estabilidade estática de tensão no plano P-Q. Primeiramente, o método foi aplicado em um sistema de potência simples com duas barras, e os resultados analíticos e computacionais foram comparados. Então, um Índice de Estabilidade de Tensão foi deduzido, para determinar a margem de segurança de cada barra para qualquer estado de operação de um sistema de potência com n-barras. Com o Índice de Estabilidade de Tensão, é possível identificar barras críticas e regiões com tendência ao colapso de tensão. Os limites de estabilidade de tensão de um sistema de distribuição foram analisados através das curvas P-Q , no qual foram considerados diferentes cenários de operação da geração eólica. Deste modo, foi demonstrado que a geração eólica pode contribuir para melhorar as margens de segurança de tensão. Finalmente, o método foi aplicado em um sistema de potência real pertencente à Companhia Estadual de Distribuição de Energia Elétrica. Os métodos desenvolvidos são computacionalmente eficientes e adequados para o planejamento da expansão e operação, bem como na operação em tempo real dos sistemas elétricos de potência.
Britz, Andreas. "Hidden in Plain Sight: John Berryman and the Poetics of Survival." Ohio University Honors Tutorial College / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1274991004.
Повний текст джерелаChakrabarty, Shantanu. "Algorithms for Adjusted Load Flow Solutions using the Complementarity Principle." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/4161.
Повний текст джерелаLin, Tzung-Feng, and 林宗鋒. "A Q-Learning with Continuous Action Generation in Multi-agent Cooperation." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/00581160591686023927.
Повний текст джерела國立中正大學
機電光工程研究所
92
In this thesis, we propose a Q-learning with continuous action generation and extend this algorithm to multi-agent systems. We implement this algorithm in a task that there are two robots taking action independently and both are connected with a straight bar. The goal of them is to cooperate with each other to pass through a gate in the middle of the grid environment. Conventional Q-learning needs pre-defined quantized state space and action space. It is not practical on real robot applications since discrete and finite numbers of action sets could not precisely identify the variances of the different positions on the same state element which the robot located on. We utilize the fuzzy-based cerebellar model controller (FCMAC) and its ability of categorization to calculate the weighting distribution of the state the robot located in and the states all surrounded. This provides better resolution of the weighting distribution for the state space where the robot located in. We can have a continuous action generation by linear combination of the weighting distribution of the state space which we calculated with FCMAC and the optimal policy of each state excited by robot derived from Q-learning. This continuous action value is more practical and has better performance than the method which has only discrete and finite numbers of action sets.
Huang, Kuan-Hao, and 黃冠皓. "Q-switched and mode-locked pulse generation from ytterbium doped fiber." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/4vs5e2.
Повний текст джерела國立臺北科技大學
光電工程系研究所
104
In this work, I investigated the Q-switched and mode-locked pulse generation in all-normal dispersion passively mode-locked Yb-doped fiber laser (PML-YDFL) based on the Bi2Se3/Polyvinyl alcohol (PVA) film or fiber-compatible topological insulator saturable absorber (TI-SA). First, we synthesized the Bi2Se3 nano-plates (NPs) via a polyol method and then dissolved the PVA into Bi2Se3 solution to produce the Bi2Se3/PVA solution. Through the drying of the Bi2Se3/PVA solution in standard cell within the oven, the dark and light Bi2Se3/PVA films were produced with high and low transmittance. After insertion the dark Bi2Se3/PVA films into an Yb-doped fiber laser laser (YDFL), the Q-switched pulse can be generated after properly adjusting of the polarization controller. As pump power increased from 105 to 182 mW, the repetition rate of Q-switched pulses was increased from the 86 KHz to 138 KHz. In addition, the mode-locked pulses with 16 MHz repetition rate and the shortest pulsewidth about 380 ps were demonstrate through the light Bi2Se3/PVA film with the pump power at 380 mw. We also fabricate the fiber-compatible TI-SA by depositing the Bi2Se3 NPs onto the fiber end facet. In comparing to the PVA film, the PML-YDFL can be mode locking at lower threshold power and higher slope efficiency. With the pump power at 131 mw, the mode-locked pulses with 13 MHz repetition rate and the shortest pulsewidth about 331 ps were demonstrate through the fiber-compatible TI-SA. Our experimental results indicate that the TI-SA made by the Bi2Se3 can be exploited for the pulsed laser applications.
許展榕. "Supercontinuum Generation from Microstructured Fibers by a Q-Switched Mode-Locked Laser." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/35800535089038726158.
Повний текст джерелаWang, Wei-Hsiang, and 王韋翔. "Optical Harmonic Generation of High-Power Q-switched Nd:YAG laser in Argon." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/50990426874705204959.
Повний текст джерелаYa-tingChan and 詹雅婷. "A study on Q-switched Ince-Gaussian laser generation with acousto-optic modulator." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/57199672130697982997.
Повний текст джерела國立成功大學
物理學系
103
The purpose of this study is to generate pulsed Ince-Gaussian(IG) lasers in end-pumped solid-state lasers and to reach different modes of selection and application of Q-switched pulsed lasers. The active Q-switch we adopting in this study is the acousto-optic (AO) modulator. However, we also adopt the chopper in this study. In the first part of the experiment, both of laser systems can be used to generate pulsed IG laser and observe the relaxation oscillation (RO). The second part of the experiment, we study on Q-switched Ince-Gaussian laser generation with AO modulator. Experimental result shows that, using AO Q-switched laser system, this study successfully generates pulsed IG lasers of several different modes. Besides, by classifying IGMs into even and odd groups, this study gives discussions on the relation between pulsed Ince-Gaussian lasers of different modes.
Holzer, Patrick. "Recovering Short Generators of Principal Fractional Ideals in Cyclotomic Fields of Conductor p^\alpha q^\beta." Master's thesis, 2017. http://tuprints.ulb.tu-darmstadt.de/6155/1/Master%20Thesis%20Patrick%20Holzer.pdf.
Повний текст джерелаWang, Chun-lin, and 王俊霖. "Single aperiodically poled lithium niobate for simultaneous laser Q-switching and optical parametric generation in a Nd:YVO4 laser." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/08345317865791381606.
Повний текст джерела國立中央大學
光電科學研究所
98
Optical parametric oscillators (OPOs) can produce wavelength tunable coherent light sources and have been widely used in various applications including the remote sensing, spectroscopy, nonlinear optics, range finder, optical communications, and bio-medicine. Several high-efficiency intracavity wavelength converters have been developed via the use of a nonlinear crystal in an acousto-optic or electro-optic (EO) Q-switched solid-state laser. However, a more compact integrated system performing the same device functions is still rare. In this thesis, we have devoted to integrate two device functions in a monolithic LiNbO3 crystal. These two devices are an EO Q-switching and an optical parametric generator (OPG). An aperiodically poled lithium niobate (APLN) crystal has been designed and fabricated in this work to simultaneously satisfy the phase-matching conditions required for functioning the two devices. We further inserted this APLN crystal in a Nd:YVO4 laser system to simultaneously function as a laser Q switch and an intracavity optical parametric amplifier. We have successfully demonstrated an efficient EO Q-switched IOPO in a compact diode-pumped 1064-nm Nd:YVO4 laser achieved using a single intracavity APLN.The APLN device was designed using the SA optimization method. It can simultaneously function as an EO Q-switch and an OPG.The OPO efficiency achieved with the system using the APLN device has been ~1.67 times higher than that with a system using a cascade PPLN device of the same device length and under the same system operating conditions. When the intracavity APLN was driven with a ~ 360-V pulse train at 1 kHz, we observed ~ 33 % energy depletion in fundamental laser pulses, yielding ~ 5-ns, ~ 1029W peak-power 1550-nm OPO laser pulses from this compact laser system pumped at 8.4-W diode power.
Huang, Chi-Chung, and 黃啟創. "Q-switched and mode-locked pulses generation in a c-cut Nd:LuVO4 laser by simultaneous acousto-optic modulator and GaAs." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/946929.
Повний текст джерела國立臺北科技大學
光電工程系研究所
98
In this thesis, we investigate the characteristics of Q-switched and mode-locked (QML) pulses generation in c-cut Nd:LuVO4 laser by using an acousto-optic modulator (AOM) and GaAs wafer. In only using the AOM, the periodic QML envelope with relative high energy pulses has been experimentally demonstrate. However, the shape of generate Q-switched envelope is asymmetric that has longer falling time than rising time. This result is opposite to the Q-switching envelope generated by the GaAs wafer that has longer rising time. Besides, the period of the Q-switching envelope is un-regular and has relative large amplitude fluctuation. In order to generation periodic and symmetric Q-switched envelope, we combine AOM and GaAs wafer in laser cavity and demonstrate the more symmetric shape can be produced at lower pump power. However, the falling time of Q-switched envelope shrinkage seriously at relative higher pump power that is due to the two photon absorption of the GaAs
Sukhoy, Kostyantyn. "Generation of green second harmonic radiation in LBO, BiBO, KTP, and PPLN crystals using passively Q-switched sub-nanosecond microchip laser." 2011. http://hdl.handle.net/1993/4744.
Повний текст джерелаGaspar, Ulisses Emanuel Rodrigues. "Aplicação de metodologia Next Generation Sequencing na pesquisa de determinantes genéticos da febre Q crónica na via de sinalização IL12-IFNy." Master's thesis, 2021. http://hdl.handle.net/10400.6/11506.
Повний текст джерелаQ fever is a zoonosis caused by Coxiella burnetii, in which about 60% of the affected patients develop acute Q fever, recovering after clinical intervention. However, in chronic Q fever cases, the disease is accompanied with serious complications, mainly manifested as endocarditis. Even with preventive measures, the incidence of Q fever has been increasing, namely in the Iberian Peninsula. The pathophysiology of C. burnetii infection resembles that of Mycobacterium tuberculosis, both characterized by granuloma formation. In this context, the interleukin 12 - interferon ? (IL12-IFN?) pathway plays a major role in intracellular bacterial survival and replication. Diseases caused by mycobacteria display physiological homogeneity inherent to interferon ? (IFN-?) deficiency, since genetic determinants of these infections have been identified in the IL12-IFN? pathway. Despite of the above mentioned, the association between genetic variants this pathway and chronic Q fever remains practically unexplored. Thus, in this investigation we seek to establish a list of variants within the IL12-IFN? pathway with pathogenic potential associated with the development of chronic Q fever. therefore, we sought to identify variants associated with chronic Q fever resorting to candidate-gene, population association analysis in a Candidate Gene Association Studies (CGAS) approach. This approach is part of a case-control study architecture. Candidate genes were selected and a Next Generation Sequencing (NGS) strategy was chosen for the genotyping of the 5’UTR region and exons of candidate genes. After informed consent, 34 healthy individuals and 60 Q fever patients (43 acute and 17 chronic forms) were recruited. The genes interleukin-12 receptor ß1 (IL12RB1), interferon ? receptor 1 (IFN?R1) and interferon ? receptor 2 (IFN?R2), were amplified in 2kb to 17kb fragments, by long-range polymerase chain reaction (PCR) with Takara LA Taq® deoxyribonucleic acid (DNA) polymerase for Nextera library construction and Illumina® sequencing. Since NGS works simultaneously with billions of data points, it requires the application of several quality control metrics in order to guarantee reliable results. In addition to these metrics, specific metrics for CGAS were also implemented to reduce possible false positives in the statistical analysis of the data. The present research work provided a list of single nucleotide polymorphisms (SNPs) of the IL12RB1, IFN?R1 and IFN?R2 genes, observed in patients with chronic Q fever, acute Q fever and in a convenience sample of healthy individuals. These data have the necessary quality to constitute an asset and can be applied to different studies. In the future, this list of SNPs will be used in genotype-phenotype association studies to understand whether there are variants in the IL12-IFN? pathway associated with the clinical presentation of the disease. Thus, these results could prove to be an important clinical advance not only to anticipate chronic forms of the disease but also to develop prevention strategies and to provide better health care to these patients.
Huang, Yao-Hsien, and 黃耀賢. "Monolithic aperiodically and periodically poled lithium niobate for simultaneous laser Q-switching and intracavity sum-frequency generation in a dual-wavelength Nd:YVO4 laser." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/95673719412115824709.
Повний текст джерела國立中央大學
光電科學研究所
100
Abstract Bragg condition is very sensitive to incident wavelength. With this characteristic, we can diffract wavelength with appropriate Bragg structure. In this letter, we first design an aperiodic structure with the help of simulated anneal algorism which compensates reciprocal vectors of dual wavelength emitted in Nd doped solid state laser system. Lithium Niobate is a great electro-optic crystal. With the high electric field poled, we can generate the structure we calculate previously on LN crystal. Thus, a 25 mm long, 5 mm in width and thickness of 0.5 mm aperiodic poled Lithium Niobate Bragg diffraction cascade 15mm long periodical poled Lithum niobate sum frequency Generation device is fabricated successfully. In experiment, we measured the high diffraction efficiency both on 1064 nm and 1342 nm, 96% and 87% respectively, at –250 and -350 volt applied voltage. Furthermore, we put our chip into the Nd:YVO4 slid sate laser system and applied a periodic electric field to the chip, we can turn it into a cavity Q-switch device. With the sum frequency crystal BIBO, we can generate narrowand high peak power 593 nm output from dual emission wavelength of Nd 1064 nm and 1342 nm. In results, the yellow-orange light output with the pulse width of 8 ns and peak power of 430 W under 8.142 W of Nd absorption power at tempature 73℃.
Chou, Pin-yu, and 周䓵譽. "Monolithic two dimension aperiodically poled lithium niobate for simultaneous laser Q-switched and intracavity sum frequency generation in a dual wavelength Nd:YVO4 laser." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/59303410051352864747.
Повний текст джерела國立中央大學
光電科學與工程學系
102
Compact, high-repetition-rate pulsed visible coherent light sources are attractive for many applications, such as biomedicine, remote sensing, astronomy, and displays. The Q-switched all-solid-state laser technique can be a promising approach to attain such light sources. Moreover, due to the high nonlinearity and highly engineerable characteristics of the quasi-phase-matching(QPM) material, a device as simultaneous a Q-switch and wavelength converter can be realized in a two-dimensional aperiodically poled lithium niobate (APPLN). In this thesis, we have designed and fabricated a unique 2D APPLN device integrating the functionalities of the Q-switch for two laser lines(1064nm and 1342 nm) simultaneously and sum frequency generator in a Nd:YVO4 laser system to generate pulsed yellow-orange laser, the such device was designed by aperiodic optical superlattice(AOS) technique and optimized by simulated annealing(SA) method. In operation, 350 volts at repetition rate of 1 KHz drove the device, while the diffraction efficiencies of 1064 nm and 1342 nm of 60 % and 55 % were measured, respectively. At diode pump power of 5.7 watts, a yellow-orange pulse with pulse width of 8.4 ns, bandwidth of 0.4 nm, and peak power of 512 can be obtained, meanwhile, the peak-to-peak fluctuation of 8.9% was also found.
See, Chan H., Raed A. Abd-Alhameed, and Peter S. Excell. "Mathematical model for calibration of nonlinear responses in biological media exposed to RF energy." 2014. http://hdl.handle.net/10454/10784.
Повний текст джерелаThis paper presents a circuit model which is used to calibrate the performance of nonlinear RF energy conversion inside a high quality factor resonant cavity with a known nonlinear loading device. The nonlinear radiofrequency energy conversion can be detected by exciting the fundamental operating frequency and observing the second harmonic resonant frequency within a doubly resonant cavity. By implementing the proposed mathematical model, the required input power can be estimated to maximise the chance of detecting the weak second harmonic signal prior to carry out the measurement.
Rodrigues, Inês Branco de Paiva de Jesus. "Geração Z: uma geração de consumo sustentável na indústria da roupa?" Master's thesis, 2021. http://hdl.handle.net/10071/24348.
Повний текст джерелаThe theme of this dissertation allows us to investigate the perception that exists in the Z generation about the purchase of sustainable clothing, their consumption patterns and the main existing barriers to sustainable development in the clothing industry. This generation is considered the digital generation, where the power of social networks and the so-called influencers bring inherent social pressure to their lifestyles, especially when it comes to buying clothes, and there are still challenges that determine the evident gap between purchase attitude and intention. These young people don't have a lot of purchasing power and find it difficult to find sustainable clothing stores, almost always referring them to fast fashion stores. Our research objectives are to understand, in a generalized way, how young people of generation Z perceive themselves as sustainable consumers in the clothing industry and what are the main barriers that lead to the existence of the gap mentioned above. A qualitative exploratory study was developed (focus groups) that allowed us to ascertain the perception of gen Zers regarding the topic under study. The results show that in fact this generation is aware of this issue. However, they are significantly influenced by social networks in terms of their consumption patterns. Thus, this generation presents characteristics that increase its susceptibility to buying sustainable clothing, but for that to happen, it is still necessary that many actions are taken by companies/brands that promote the consumption of sustainable clothing.
Oliveira, Margarida Ramalho Almeida. "The effect of feed-in tariffs on the deployment of renewable energies." Master's thesis, 2020. http://hdl.handle.net/10071/21157.
Повний текст джерелаEste estudo pretende avaliar a relação entre as tarifas feed-in e o desenvolvimento das energias renováveis. Selecionamos uma amostra de 28 países da UE cobrindo o período de 1990-2017. Para analisar os dados, adotamos uma abordagem de dados em painel realizando uma estimativa de efeitos aleatórios. Entre as diversas variáveis explicativas, os valores de tarifas feed-in discriminadas pelos diferentes tipos de tecnologia são definidos como as variáveis de interesse em explicar a parcela da capacidade elétrica gerada a partir de uma fonte renovável não hídrica. Os resultados sugerem que, das diferentes tecnologias em análise, apenas o Vento e os Resíduos impactam variável dependente, aliados à parcela da eletricidade gerada a partir de uma fonte de combustível nuclear e fóssil e dos preços das fontes tradicionais de energia. As conclusões anteriores são robustas para os países membros da OCDE e também para os países onde a tarifa feed-in é aplicada a pelo menos uma das tecnologias em análise.