Дисертації з теми "Electric power processes"
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Song, Yang. "Electrostatically controlled enzymatic reaction, metabolic processes and microbial generation of electric power." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1398685271.
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Smith, William Corbett. "Analysis of variances in electric power system simulation for production cost." Ohio : Ohio University, 1991. http://www.ohiolink.edu/etd/view.cgi?ohiou1173467167.
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Callwood, Concha Maria. "The role of legislative processes and electric utilities in effecting global environmental goals." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11182008-063050/.
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Andrews, Clinton James. "Improving the analytics of open planning processes : scenario-based multiple attribute tradeoff analysis for regional electric power planning." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/13566.
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Sear, David Ayres. "Sediment transport processes in riffle-pool sequences and the effects of river regulation for hydro-electric power within the North Tyne." Thesis, University of Newcastle Upon Tyne, 1992. http://hdl.handle.net/10443/325.
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This study examines the effects of 10 years of river regulation on the sediments and sediment transport processes within the gravel-bedded River North Tyne. The North Tyne was regulated following the closure of Kielder dam in 1981. Since 1984, the releases from Kielder reservoir have been dominated by the generation of hydro-electricpower. The work combines a long term review and re-survey of pre-regulation sediment and bathymetric databases, with measurements of contemporary sedimentological and sediment transport processes. This has involved the application of a range of techniques designed to characterise the bed morphology and sediments. These included two new techniques for determining the structure and strength of gravel-bed surfaces. The results of these surveys revealed subtle changes in the grainsize composition of riffle sediments, characterised by an increase in the frequency of coarse particles at the surface, and the accentuation of bed structure and particle compaction. This has resulted from a process of hydraulic winnowing sustained as a result of the high shear stresses experienced on riffles during the passage of the hydropower release wave. Direct measurements of sediment transport using a range of tracing and trapping techniques identified a sediment flux divergence between riffles and pools. During rising discharges, sediments are selectively restrained by bed structure on riffles, whilst pool sediments become competent in the order pool-head, mid-pool, pool-tail. This generates a queuing system for sediments culminating at high discharges in the evacuation of the pool-tail to the downstream riffle. The presence of bed structure on riffles presents a surface of higher particle entrapment probability; the net result of which is lower particle velocities over riffles than in pools, and a subsequent choking of riffles with pool sediments. The interaction of the regulated flood waves and the riffle-pool morphology produces riffle degradation and pool-tail aggradation, although at rates much lower than in a neighbouring regulated river. Hydropower releases retard the rates of aggradational channel change caused by the reduction of flood magnitude. However, historical evidence suggests that catchment sediment supply is variable through time, and should new supplies be accessed, major channel changes should be anticipated, particularly at the tributary junctions. The results of this study have direct implications for the management of game fisheries in regulated rivers, and for understanding the relationships between flood waves and sediment transport in morphologically diverse channels.
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González, Zumba Jorge Andrés. "Dynamic Modeling and Stability Analysis of Stochastic Multi-Physical Systems Applied to Electric Power Systems." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/158558.
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[ES] La naturaleza aleatoria que caracteriza algunos fenómenos en sistemas físicos reales (e.g., ingeniería, biología, economía, finanzas, epidemiología y otros) nos ha planteado el desafío de un cambio de paradigma del modelado matemático y el análisis de sistemas dinámicos, y a tratar los fenómenos aleatorios como variables aleatorias o procesos estocásticos. Este enfoque novedoso ha traído como consecuencia nuevas especificidades que la teoría clásica del modelado y análisis de sistemas dinámicos deterministas no ha podido cubrir. Afortunadamente, maravillosas contribuciones, realizadas sobre todo en el último siglo, desde el campo de las matemáticas por científicos como Kolmogorov, Langevin, Lévy, Itô, Stratonovich, sólo por nombrar algunos; han abierto las puertas para un estudio bien fundamentado de la dinámica de sistemas físicos perturbados por ruido.
En la presente tesis se discute el uso de ecuaciones diferenciales algebraicas estocásticas (EDAEs) para el modelado de sistemas multifísicos en red afectados por perturbaciones estocásticas, así como la evaluación de su estabilidad asintótica a través de exponentes de Lyapunov (ELs). El estudio está enfocado en EDAEs d-index-1 y su reformulación como ecuaciones diferenciales estocásticas ordinarias (EDEs). Fundamentados en la teoría ergódica, es factible analizar los ELs a través de sistemas dinámicos aleatorios (SDAs) generados por EDEs subyacentes. Una vez garantizada la existencia de ELs bien definidas, hemos procedido al uso de técnicas de simulación numérica para determinar los ELs numéricamente. Hemos implementado métodos numéricos basados en descomposición QR discreta y continua para el cómputo de la matriz de solución fundamental y su uso en el cálculo de los ELs. Las características numéricas y computacionales más relevantes de ambos métodos se ilustran mediante pruebas numéricas. Toda esta investigación sobre el modelado de sistemas con EDAEs y evaluación de su estabilidad a través de ELs calculados numéricamente, tiene una interesante aplicación en ingeniería. Esta es la evaluación de la estabilidad dinámica de sistemas eléctricos de potencia. En el presente trabajo de investigación, implementamos nuestros métodos numéricos basados en descomposición QR para el test de estabilidad dinámica en dos modelos de sistemas eléctricos de potencia de una-máquina bus-infinito (OMBI) afectados por diferentes perturbaciones ruidosas. El análisis en pequeña-señal evidencia el potencial de las técnicas propuestas en aplicaciones de ingeniería.[CA] La naturalesa aleatòria que caracteritza alguns fenòmens en sistemes físics reals (e.g., enginyeria, biologia, economia, finances, epidemiologia i uns altres) ens ha plantejat el desafiament d'un canvi de paradigma del modelatge matemàtic i l'anàlisi de sistemes dinàmics, i a tractar els fenòmens aleatoris com a variables aleatòries o processos estocàstics. Aquest enfocament nou ha portat com a conseqüència noves especificitats que la teoria clàssica del modelatge i anàlisi de sistemes dinàmics deterministes no ha pogut cobrir. Afortunadament, meravelloses contribucions, realitzades sobretot en l'últim segle, des del camp de les matemàtiques per científics com Kolmogorov, Langevin, Lévy, Itô, Stratonovich, només per nomenar alguns; han obert les portes per a un estudi ben fonamentat de la dinàmica de sistemes físics pertorbats per soroll. En la present tesi es discuteix l'ús d'equacions diferencials algebraiques estocàstiques (EDAEs) per al modelatge de sistemes multifísicos en xarxa afectats per pertorbacions estocàstiques, així com l'avaluació de la seua estabilitat asimptòtica a través d'exponents de Lyapunov (ELs). L'estudi està enfocat en EDAEs d-index-1 i la seua reformulació com a equacions diferencials estocàstiques ordinàries (EDEs). Fonamentats en la teoria ergòdica, és factible analitzar els ELs a través de sistemes dinàmics aleatoris (SDAs) generats per EDEs subjacents. Una vegada garantida l'existència d'ELs ben definides, hem procedit a l'ús de tècniques de simulació numèrica per a determinar els ELs numèricament. Hem implementat mètodes numèrics basats en descomposició QR discreta i contínua per al còmput de la matriu de solució fonamental i el seu ús en el càlcul dels ELs. Les característiques numèriques i computacionals més rellevants de tots dos mètodes s'illustren mitjançant proves numèriques. Tota aquesta investigació sobre el modelatge de sistemes amb EDAEs i avaluació de la seua estabilitat a través d'ELs calculats numèricament, té una interessant aplicació en enginyeria. Aquesta és l'avaluació de l'estabilitat dinàmica de sistemes elèctrics de potència. En el present treball de recerca, implementem els nostres mètodes numèrics basats en descomposició QR per al test d'estabilitat dinàmica en dos models de sistemes elèctrics de potència d'una-màquina bus-infinit (OMBI) afectats per diferents pertorbacions sorolloses. L'anàlisi en xicotet-senyal evidencia el potencial de les tècniques proposades en aplicacions d'enginyeria.
[EN] The random nature that characterizes some phenomena in the real-world physical systems (e.g., engineering, biology, economics, finance, epidemiology, and others) has posed the challenge of changing the modeling and analysis paradigm and treat these phenomena as random variables or stochastic processes. Consequently, this novel approach has brought new specificities that the classical theory of modeling and analysis for deterministic dynamical systems cannot cover. Fortunately, stunning contributions made overall in the last century from the mathematics field by scientists such as Kolmogorov, Langevin, Lévy, Itô, Stratonovich, to name a few; have opened avenues for a well-founded study of the dynamics in physical systems perturbed by noise. In the present thesis, we discuss stochastic differential-algebraic equations (SDAEs) for modeling multi-physical network systems under stochastic disturbances, and their asymptotic stability assessment via Lyapunov exponents (LEs). We focus on d-index-1 SDAEs and their reformulation as ordinary stochastic differential equations (SDEs). Supported by the ergodic theory, it is feasible to analyze the LEs via the random dynamical system (RDSs) generated by the underlying SDEs. Once the existence of well-defined LEs is guaranteed, we proceed to the use of numerical simulation techniques to determine the LEs numerically. Discrete and continuous QR decomposition-based numerical methods are implemented to compute the fundamental solution matrix and use it in the computation of the LEs. Important numerical and computational features of both methods are illustrated through numerical tests. All this investigation concerning systems modeling through SDAEs and their stability assessment via computed LEs finds an appealing engineering application in the dynamic stability assessment of power systems. In this research work, we implement our QR-based numerical methods for testing the dynamic stability in two types of single-machine infinite-bus (SMIB) power system models perturbed by different noisy disturbances. The analysis in small-signal evidences the potential of the proposed techniques in engineering applications.
Mi agradecimiento al estado ecuatoriano que, a través del Programa de Becas para el Fortalecimiento y Desarrollo del Talento Humano en Ciencia y Tecnología 2012 de la Secretaría Nacional de Educación Superior, Ciencia y Tecnología (SENESCYT), han financiado mis estudios de doctorado.
González Zumba, JA. (2020). Dynamic Modeling and Stability Analysis of Stochastic Multi-Physical Systems Applied to Electric Power Systems [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/158558
TESIS
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Gonçalves, Orlando Augusto Vieira. "Gestão do consumo de energia elétrica: estudo de caso num instituto de pesquisa na cidade do Rio de Janeiro." Universidade Federal Fluminense, 2016. https://app.uff.br/riuff/handle/1/4322.
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A crise energética tem ganhado bastante visibilidade na sociedade, nas empresas privadas e também nos órgãos públicos, suscitando ações necessárias para a redução do consumo de água e de energia elétrica. A pesquisa procura identificar a problemática do consumo de energia elétrica, com suas causas e efeitos, no contexto da crise hidroelétrica brasileira. Esta pesquisa tem por objetivo geral analisar e discutir as principais ações que devem ser tomadas para se obter a redução do consumo de energia elétrica em ambientes competitivos. Para tanto, tem como objetivos específicos: fazer uma revisão na literatura sobre a gestão do consumo de energia e identificar um conjunto de critérios que permitam avaliar a gestão de energia; estudar os modelos relatados na literatura com a indicação de ações que contemplem o uso racional e eficiente da energia elétrica; aplicar no estudo de caso os critérios encontrados na literatura e propor ações de melhoria e gestão eficaz do consumo elétrico ajustado a um Instituto de Pesquisa de uma Autarquia Federal no Rio de Janeiro. Uma revisão da literatura nas bases Scopus e SciELO foi realizada para dar suporte à construção desse modelo. Foi utilizado um questionário para definir e classificar o conjunto de critérios que contribuem para a redução do consumo no modelo utilizado. Um grupo de especialistas foi formado para validar os problemas encontrados e opinar sobre as soluções propostas. O método da pesquisa é indutivo de natureza exploratória e descritiva com abordagem quali-quantitativa. Os resultados da revisão da literatura apontaram para nove critérios relevantes e mostram que é possível alcançar uma redução no consumo de energia a partir do estudo desses critérios e de sua correlação com as variáveis coletadas no estudo de caso. Os resultados obtidos do questionário que foi aplicado junto aos especialistas no estudo de caso excluíram os três critérios menos relevantes, através da aplicação do Diagrama de Pareto. A pesquisa contribui para o desenvolvimento de uma metodologia para avaliação de ações visando o uso racional da energia elétrica. Contribui também para ações de planejamento sustentável que possam auxiliar as tomadas de decisão nos níveis operacional e gerencial num contexto de crise hidroelétrica.
The energy crisis has gained considerable visibility in society, in private companies and also in public agencies, provoking actions necessary to reduce water and electricity consumption. The research seeks to identify the problem of the consumption of electric energy, with its causes and effects, in the context of the Brazilian hydroelectric crisis. This research has as general objective to analyze and discuss the main actions that must be taken to obtain the reduction of the consumption of electric energy in competitive environments. To do so, it has specific objectives: to review the literature on the management of energy consumption and to identify a set of criteria for assessing energy management; To study the models reported in the literature with the indication of actions that contemplate the rational and efficient use of electric energy; To apply in the case study the criteria found in the literature and to propose actions of improvement and effective management of the adjusted electric consumption to a Research Institute of a Federal Autarchy in Rio de Janeiro. A review of the literature on Scopus and SciELO bases was carried out to support the construction of this model. A questionnaire was used to define and classify the set of criteria that contribute to the reduction of consumption in the model used. A group of experts was formed to validate the problems encountered and to give an opinion on the proposed solutions. The research method is inductive of an exploratory and descriptive nature with a qualitative-quantitative approach. The results of the literature review pointed to nine relevant criteria and show that it is possible to achieve a reduction in energy consumption based on the study of these criteria and their correlation with the variables collected in the case study. The results obtained from the questionnaire that was applied to the experts in the case study excluded the three less relevant criteria through the application of the Pareto Diagram. The research contributes to the development of a methodology for the evaluation of actions aimed at the rational use of electric energy. It also contributes to sustainable planning actions that can aid decision making at the operational and managerial levels in a context of hydroelectric crisis.
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Swaminathan, Shiva. "The influence of initial conditions on power system production costing - A markovian approach." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1178904364.
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Fetzek, Charles A. "Behavior-based power management in autonomous mobile robots." Wright-Patterson AFB : Air Force Institute of Technology, 2008. http://handle.dtic.mil/100.2/ADA487084.
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Заболотній, Денис Ігорович. "Методи виявлення ферорезонансних процесів в електричних мережах з великими струмами замикання на землю". Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/31661.
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Магістерська дисертація складається з пояснювальної записки та графічної частини. Пояснювальна записка виконана на 216 сторінках формату А4, в яку входять 87 таблиць та 75 рисунків. Графічна частина містить 8 аркушів технічних креслень формату А1.
В магістерській дисертації виконано проект районної електричної мережі напругою 110 кВ та електричної частини підстанції 110/35/10 кВ. Розроблено стартап-проект, розглянуто питання релейного захисту та охорони праці. Досліджено застосування ферорезонансних процесів.The master's dissertation consists of an explanatory note and a graphic part. The explanatory note is made on page 216 of A4 format, which includes 87 chart and 75 figures. The graphic part contains 8 sheets or technical drawings of A1 format. In the master's thesis the project of the district electric network 110 kV and the electrical part of the substation 110/35/10 kV was executed. A startup project has been developed, issues of relay protection and labor protection have been considered. The application of ferroresonance processes is investigated.
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Сиротин, Юрий Александрович. "Компенсация и учет реактивной мощности в электротехнических системах с несимметричными режимами". Thesis, НТУ "ХПИ", 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21116.
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Диссертация на соискание ученой степени доктора технических наук по специальности 05.09.03 - электротехнические комплексы и системы. - Национальный технический университет "Харьковский политехнический институт". - Харьков, 2015.
Диссертационная работа посвящена решению важной научно-технической проблемы создания обобщенной теории мощности (ТМ), единого комплексного подхода к компенсации и учету неактивных составляющих полной мощности (ПМ) для обеспечения оптимального режима потребления электрической энергии (ЭЭ) в точке подключения неидеальной нагрузки к сети с несимметричным напряжением. На основе теоретических исследований, использующих метод ортогонального разложения векторов мгновенных значений 3-фазного тока и напряжения, получена обобщенная векторная математическая модель (ВММ), которая классифицирует электроэнергетические режимы (ЭР) в 3-фазной схеме электроснабжения с помощью векторной мгновенной мощности (ММ). Сформулированы и обоснованы предложения политики повышения качества поставки и потребления электроэнергии в 3-фазной сети, сочетающие установку поставщиком в каждой точке подключения потребителя счетчика, измеряющего каждую ЭКТ, заключение публичного договора, в котором предусмотрена оплата каждой ЭКТ по своему тарифу, установки потребителем КУ, применение компенсации неактивных составляющих ПМ на каждом уровне для уменьшения групповых потерь в сетях поставщика. Предложенная политика позволит учесть разную степень влияния ЭКТ на качество электроэнергии и обеспечит потребителю выбор выгодного для него способа потребления электроэнергии, стимулирует установку КУ, а поставщику обеспечит надежную методологию повышения качества электроэнергии в рамках несимметрии нагрузки и напряжения.Thesis for a Doctor’s degree in Engineering Sciences by specialty 05.09.03 - Electrical Engineering Complexes and Systems. - National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2015. The dissertation is devoted an important scientific and technical issues to improve the power quality of supply and consumption (SC) in three-phase networks through further development of die power theory, development of methods and ways of compensation, proposals for the accounting and payment of the inactive components of the apparent power (AP). A generalized mathematical model (GMM) of electric power processes (EPP) in a 3-phase SC scheme was developed. The model of 3-wire circuit is provided by a special (О-balanced) mode of the model 4-wire circuit The developed GMM classifies the SC modes using the vectorial instantaneous power (IP) and summarizes the class of models used in the theory of IP. For sinusoidal mode with asymmetric voltage the refines vectorial mathematical model (VMV) 3-phasors (complex rms vectors) was created. The analytical expressions for the integral characteristics of the classified modes are founded and their relationship with standard IP and vectorial IP are established. With asymmetrical voltage and asymmetrical loading a sinusoidal mode can be both unbalanced and pulsed. Each mode is represented by its power equation and the equivalent orthogonal decomposition of the 3-phase current Both decompositions are used to create the optimal mode of SC with a constant IP at asymmetrical voltage. The proposed compensator provides the non-puised energy supply with the highest possible power factor and with the same average (active) power as the initial current. Based on the evaluation and calculation of the power equation components of a unbalanced mode was developed a methodology for calculating the loss of the measuring selection. A methodology and technique of analytical calculation of additional losses on the passport data of the connected electrical equipment was proposed. Formulated and proved offers on differential measurement and payment of the energy components of AP will stimulate consumer sets the compensator, and provide a reliable methodology for improving the quality of SC (within unbalance loading and voltage).
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Belock, Keith Allan. "An energy audit manual for small manufacturing companies with a case study of Maugus Manufacturing Company." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1179851925.
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Mousavi, Takami Kourosh. "Process Control and Simulation of Ferromagnetic Strip in the Power Transformers and Electrical Machines Applications : Electric power systems." Doctoral thesis, Västerås : School of Sustainable Development of Sociaty and Technology, Mälardalen University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-6648.
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Bennett, Fiona. "Electrostatic charge phenomena in powder processes for dry powder inhalers." Thesis, University of Sunderland, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365417.
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Holmgren, Åke J. "Quantitative vulnerability analysis of electric power networks." Doctoral thesis, KTH, Transporter och samhällsekonomi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3969.
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Disturbances in the supply of electric power can have serious implications for everyday life as well as for national (homeland) security. A power outage can be initiated by natural disasters, adverse weather, technical failures, human errors, sabotage, terrorism, and acts of war. The vulnerability of a system is described as a sensitivity to threats and hazards, and is measured by P (Q(t) > q), i.e. the probability of at least one disturbance with negative societal consequences Q larger than some critical value q, during a given period of time (0,t]. The aim of the thesis is to present methods for quantitative vulnerability analysis of electric power delivery networks to enable effective strategies for prevention, mitigation, response, and recovery to be developed. Paper I provides a framework for vulnerability assessment of infrastructure systems. The paper discusses concepts and perspectives for developing a methodology for vulnerability analysis, and gives examples related to power systems. Paper II analyzes the vulnerability of power delivery systems by means of statistical analysis of Swedish disturbance data. It is demonstrated that the size of large disturbances follows a power law, and that the occurrence of disturbances can be modeled as a Poisson process. Paper III models electric power delivery systems as graphs. Statistical measures for characterizing the structure of two empirical transmission systems are calculated, and a structural vulnerability analysis is performed, i.e. a study of the connectivity of the graph when vertices and edges are disabled. Paper IV discusses the origin of power laws in complex systems in terms of their structure and the dynamics of disturbance propagation. A branching process is used to model the structure of a power distribution system, and it is shown that the disturbance size in this analytical network model follows a power law. Paper V shows how the interaction between an antagonist and the defender of a power system can be modeled as a game. A numerical example is presented, and it is studied if there exists a dominant defense strategy, and if there is an optimal allocation of resources between protection of components, and recovery.QC 20100831
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Abur, Ali. "Knowledge-based power flow models and array processor-based power flow solutions for fast prediction of system states /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487261553057511.
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Glöckner, Reinhard Jörg. "Power transfer optimised automatic matching networks." Thesis, Northumbria University, 2009. http://nrl.northumbria.ac.uk/1622/.
Повний текст джерелаАнотація:
Matching networks are widely used to enhance active power transfer when radio frequency generators drive complex loads. The tuning of the network for varying loads typically involves searching for optimum matching conditions. However, improving the matching condition of the network does not necessarily indicate an increase in active power transfer. As an example, a 71 network with three adjustable elements may achieve comparable matches for a variety of elements' settings, each matching triple exhibiting a different transferred active power. Furthermore, the influence of the transmission lines used to connect the matching network to its source and load is rarely taken into account. The purpose of the work is to optimise the power gain of a narrowband matching sys-tem in the frequency range of 1.8 — 30 MHz. The system consists of a source, a match-ing network, a load and two interconnecting lines whose characteristic impedance is complex. The optimisation process involves optimum choice of the transmission lines' lengths and development of a matching strategy. Its objective is to ensure automatic and continuous adjustment of the matching network for optimum ac¬tive power transfer to its load while matching the network's input impedance to a resistive source. The network topologies employed are limited to the most common 71 and T networks consisting of two variable capacitors and one central inductor. Losses are assumed to be mainly caused by the inductor. An appropriate simple and synthetic model of the losses is proposed which is suitable for active power transfer optimisation. The model is validated against losses of inductors derived by different works. After choosing a proper network parametrisation and exact inclusion of the losses during network design, the losses of a network terminated by a resistance and de¬signed to match (exactly) a source resistance at its input are derived. Then its power gain is optimised by a proper choice of the network's parameter and the impact of changing the purely resistive termination to impedances exhibiting capacitive or in¬ductive imaginary parts is considered. An explicit solution is calculated for networks with a constant Q factor central inductor, its differences from the approximate solu¬tion (network elements designed as if the network would be lossless) are considered. Example diagrams are given illustrating those differences and power gain contour Smith charts are drawn for typical ranges of the L, iv, and T networks' elements. Combining the results of the different approaches yields an optimum matching strat¬egy. The losses of transmission lines connecting source and network of load and network are determined, where the lines' complex characteristic impedance is taken into account. Those losses are included in a power gain optimisation of the complete matching system. Finally, an experimental setup is designed under which the matching strategy of the network is tested and validated.
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Amira, Sihem. "Electrical power system load flow using a distributed array processor." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267799.
Повний текст джерела
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Wang, Cai Johnson R. Wayne. "High temperature high power SiC devices packaging processes and materials development." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/doctoral/WANG_CAI_24.pdf.
Повний текст джерела
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Huang, Chih-Jung. "Opto-electronic class AB microwave power amplifier using photoconductive switch technology." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4458.
Повний текст джерелаАнотація:
Thesis (Ph.D.)--University of Missouri-Columbia, 2006.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (April 26, 2007) Vita. Includes bibliographical references.
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Morris, Randy W. Jr. "PROPEL: Power & Area-Efficient, Scalable Opto-Electronic Network-on-Chip." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1244146228.
Повний текст джерела
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Hudson, Robert Dearn. "Development of an integrated co-processor based power electronic drive / by Robert D. Hudson." Thesis, North-West University, 2008. http://hdl.handle.net/10394/3723.
Повний текст джерелаАнотація:
The McTronX research group at the North-West University is currently researching self-sensing techniques for Active Magnetic Bearings (AMB). The research is part of an ongoing effort to expand the knowledge base on AMBs in the School of Electrical, Electronic and Computer Engineering to support industries that make use of the technology. The aim of this project is to develop an integrated co-processor based power electronic drive with the emphasis placed on the ability of the co-processor to execute AMB self-sensing algorithms.
The two primary techniques for implementing self-sensing in AMBs are state estimation and modulation. This research focuses on hardware development to facilitate the implementation of the modulation method. Self-sensing algorithms require concurrent processing power and speed that are well suited to an architecture that combines a digital signal processor (DSP) and a field programmable gate array (FPGA). A comprehensive review of various power amplifier topologies shows that the pulse width modulation (PWM) switching amplifier is best suited for controlling the voltage and current required to drive the AMB coils. Combining DSPs and power electronics to form an integrated co-processor based power electronic drive requires detail attention to aspects of PCB design, including signal integrity and grounding.
A conceptual design is conducted and forms part of the process of compiling a subsystem development specification for the integrated drive, in conjunction with the McTronX Research Group. Component selection criteria, trade-off studies and various circuit simulations serve as the basis for this essential phase of the project. The conceptual design and development specification determines the architecture, functionality and interfaces of the integrated drive. Conceptual designs for the power amplifier, digital controller, electronic supply and mechanical layout of the integrated drive is provided.
A detail design is performed for the power amplifier, digital controller and electronic supply. Issues such as component selection, power supply requirements, thermal design, interfacing of the various circuit elements and PCB design are covered in detail. The output of the detail design is a complete set of circuit diagrams for the integrated controller.
The integrated drive is interfaced with existing AMB hardware and facilitates the successful implementation of two self-sensing techniques. The hardware performance of the integrated coprocessor based power electronic drive is evaluated by means of measurements taken from this experimental self-sensing setup. The co-processor performance is evaluated in terms of resource usage and execution time and performs satisfactorily in this regard.
The integrated co-processor based power electronic drive provided sufficient resources, processing speed and flexibility to accommodate a variety of self-sensing algorithms thus contributing to the research currently underway in the field of AMBs by the McTronX research group at the North-West University.Thesis (M.Ing. (Electrical Engineering))--North-West University, Potchefstroom Campus, 2009.
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Van, Papendorp J. F. "Digital control of line-interactive UPS." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6537.
Повний текст джерелаАнотація:
Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.ENGLISH ABSTRACT: The digital control of UPS systems has been difficult in the past due to a lack of DSP technology. It was for this reason not possible to establishing the necessary control to regulate the voltages and currents of the UPS systems. Recent advances in DSP technology have however provided the means of establishing central control of the UPS system as well as incorporating more complex closed-loop control algorithms by utilising a single floating-point DSP. Closed-loop control strategies are investigated and the central control of a line-interactive UPS is established in this study. Both the status of the physical system as well as various system parameters are controlled. The system both regulates and charges the storage batteries when the main utility supply is maintained. In the event that the utility fails, the converter instantaneously changes power flow towards the load with the aim of maintaining an uninterrupted voltage supply. Several closed-loop deadbeat based control strategies are investigated for the regulation of the inductor current. A solution for the regulation of the DC-link is also developed and implemented. Furthermore, an intensive study is done on the regulation of the voltage supplied to the load in the event that the utility supply fails. The investigation is initially approached by considering classical control theory. Although these control strategies provided sufficient results, a predictive strategy that is based on the physical conditions of the switching converter is finally investigated to establish closed loop control of the output voltage. This resulted in a high-bandwidth voltage controller capable of maintaining control under a wide-array of load conditions.
AFRIKAANSE OPSOMMING: Die digitale beheer van UPS stelsels was moeilik in the verlede as gevolg van 'n gebrek aan DSP tegnologie. Dit was vir hierdie rede nie moontlik om beheer te kon bewerkstelling ten einde die spannings and strome in the UPS stelsels te kon reguleer nie. Onlangse vordering in DSP tegnologie het egter dit moontlik gemaak om sentrale beheer van die UPS stelsel te bewerkstellig sowel as om meer komplekse geslote lus beheer algoritmes te inkorporeer met behulp van 'n enkele DSP. Geslote lus beheer strategiëe word ondersoek en die sentrale beheer van die line-interaktiewe UPS word bewerkstellig in hierdie studie. Beide die huidige toestand van die fisiese stelsel sowel as die verskeie parameters word beheer. Die stelsel beide laai en reguleer die batterye terwyl die hooftoevoer onderhou word. In die geval dat die hooftoevoer faal, word die omsetter se rigting van drywingsvloei verander om die las te voorsien van 'n ononderbroke spannings toevoer. Verskeie geslote-lus “deadbeat” beheer strategiëe word ondersoek vir die regulasie van die induktor stroom. 'n Oplossing vir die regulasie van die GS-koppervlak word ook ontwikkel en geïmplementeer. Verder word 'n intensiewe studie gedoen op regulasie van die spanning wat aan die las gevoer word in die geval dat die hooftoevoer faal. Hierdie ondersoek word aanvanklik benader deur klassieke beheer teorie te bestudeer. Alhoewel hierdie beheer strategiëe voldoene resultate gebied het, was 'n voorspel beheerstrategie gebaseer op die fisiese toestand van die omsetter finaal ondersoek. Die resultaat is 'n hoë-bandwydte spannings beheerder wat daartoe instaat is om beheer te handhaaf onder 'n verskeidenheid van lastoestande.
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Alcázar, Ortega Manuel. "Evaluation and Assessment of New Demand Response Products based on the use of Flexibility in Industrial Processes: Application to the Food Industry." Doctoral thesis, Universitat Politècnica de València, 2011. http://hdl.handle.net/10251/10078.
Повний текст джерелаАнотація:
En el marco de un mercado de la electricidad con precios cada vez más altos y donde la participación de fuentes renovables de generación está jugando un papel cada vez más importante, esta tesis supone un enfoque innovador hacia la participación de recursos de demanda en mercados de operación, prestando una atención especial a segmentos industriales como el sector alimentario con un consumo energético intensivo.
En primer lugar, esta tesis describe detalladamente la situación actual de los programas de respuesta de la demanda que existen en diferentes partes del mundo. Este estudio permite concluir que los consumidores no han sido tenidos en cuenta suficientemente en la fase de diseño de los programas existentes, lo que ha provocado la infrautilización de recursos de demanda que, actualmente, permanecen sin explorar. Por otro lado, los consumidores no son conscientes del valor que su flexibilidad podría tener para el sistema eléctrico en su conjunto, ignorando que puedan existir otros agentes dispuestos a pagarles a cambio de reducir sus cargas en períodos determinados. Como resultado, esta tesis desarrolla una nueva metodología para explorar y valorar nuevos mecanismos de respuesta de la demanda donde el punto de vista de consumidores, operadores de red y cualquier otro agente interesado pueda ser tenido en cuenta. Esta metodología, basada en la evaluación y análisis detallado de los procesos, proporciona a los consumidores las herramientas adecuadas para evaluar su capacidad para reaccionar al precio de la electricidad, lo que permitiría al regulador poner en valor el beneficio social de dicha flexibilidad si pudiera ser utilizada en mercados de operación, ayudándole a definir los programas necesarios para utilizar de forma adecuada el potencial identificado por los consumidores.
La metodología desarrollada en esta tesis ha sido aplicada satisfactoriamente al sub-segmento de la industria cárnica, por lo que varias fábricas pertenecientes a este segmento han sido estudiadas en detalle. En concreto, la factibilidad de las acciones
propuestas ha sido probada y validada satisfactoriamente en una fábrica dedicada a la
producción de jamón curado en España, en la que se han evaluado diferentes
estrategias de flexibilidad.
Finalmente, se ha realizado una evaluación económica de la rentabilidad de la
aplicación de las acciones de flexibilidad propuestas tanto para el consumidor como
para el sistema eléctrico en su conjunto, donde se han considerado los precios reales
de los mercados de operación en España, aun cuando los consumidores no puedan
participar realmente en dichos mercados en la actualidad.Alcázar Ortega, M. (2011). Evaluation and Assessment of New Demand Response Products based on the use of Flexibility in Industrial Processes: Application to the Food Industry [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/10078
Palancia
25
Matsukevich, I. V., and A. I. Klyndyuk. "Processes Occurring at Preparation of Ca3Co4O9+ Ceramics by Means of Different Solution Methods, and Its Properties." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35255.
Повний текст джерелаАнотація:
By means of complex independent methods the processes occurring at preparation of Ca3Co4O9+ ceram-ics using solid-state reactions and different solution (citrate, polymeric and sol-gel) methods were investi-gated. The crystal structure and microstructure, oxygen stoichiometry, thermal expansion, electrical con-ductivity and thermo-EMF of the samples were studied and values of their power factor were calculated. It is shown that usage of solution methods let us obtain more dense and fine-grained ceramics, which is char-acterized with higher values of electrical conductivity and power factor.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35255
26
PEREIRA, LUIZ A. T. "Desenvolvimento de processos de reciclagem de cavacos de Zircaloy via refusão em forno elétrico a arco e metalurgia do pó." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23302.
Повний текст джерелаАнотація:
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-01-21T10:18:45Z
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Tese (Doutorado em Tecnologia Nuclear)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Ma, Kai. "Power Constrained Performance Optimization in Chip Multi-processors." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1373297788.
Повний текст джерела
28
Zhang, Bin. "FPGA Design of a Multicore Neuromorphic Processing System." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1461694994.
Повний текст джерела
29
Guilhoto, João Vitor de Araújo 1983. "Representação trifásica de desequilíbrios estruturais e operacionais em sistema de média tensão de distribuição." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260676.
Повний текст джерелаАнотація:
Orientador: Anésio dos Santos JúniorDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: A complexidade crescente dos estudos em sistemas de distribuição demanda uma formulação e modelagem capazes de agregar os desequilíbrios estruturais e operacionais dos sistemas elétricos de distribuição aos resultados das condições operacionais em regime permanente. Neste trabalho, aborda-se a representação trifásica em sistemas elétricos de média tensão de distribuição, considerando as particularidades dos sistemas trifásicos, bifásicos e monofásicos (MRT); e desenvolvendo os modelos dos circuitos, cargas, bancos de capacitores, transformadores e bancos de reguladores de tensão. Visando estabelecer o futuro vínculo dos modelos desenvolvidos com as sistemáticas existentes de determinação das condições operacionais dos sistemas elétricos de média tensão de distribuição, adota-se formulação matricial generalizada de correlação das correntes e tensões nodais. Tal formulação torna possível explorar e analisar os desequilíbrios estruturais e operacionais
Abstract: The increase complexity of power distribution analysis demands formulation and modeling that are capable to integrate structural and operational unbalance to steady state operational conditions. In this work the three-phase representation on distribution systems is addressed taking in account three-phase, two-phase and single-phase systems particularities; and developing the models for lines, loads, capacitor banks, transformers and step-voltage regulators. To achieve the future link between the models and existing techniques to determine the distribution systems operational conditions, it's chosen the formulation based on generalized matrices that establish the correlation of currents and nodal voltages. This formulation makes possible to explore and analyze the structural and operational unbalances
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica
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Paula, Alexandre de. "Sistema de medição de demanda e qualidade de energia elétrica." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-27102017-141628/.
Повний текст джерелаАнотація:
Os medidores de energia elétrica estão deixando de ser simples instrumentos de aplicação dedicada para se tomarem instrumentos extremamente funcionais. Desde a sua invenção, os medidores vêm sofrendo alterações de acordo com os recursos tecnológicos da época e as exigências de mercado. Atualmente, os processadores digitais de sinais têm sido amplamente empregados nesta área, permitindo a integração de uma série de funções em um único equipamento, além da implementação de algoritmos mais complexos. Estas funções geralmente incluem o cálculo de uma variedade de parâmetros elétricos, comunicação remota, integração com sistemas digitais e outras. Este trabalho apresenta um estudo e o desenvolvimento de um medidor de energia elétrica baseado no processador digital de sinais DSP56002 da Motorola. Entre as funções que são incorporadas ao medidor, destaca-se o monitoramento da qualidade da energia elétrica, visto que esta será uma tendência futura.Electric energy meters have been changing from simple instruments for dedicated applications to very functional ones. Since their invention, the meters has changed accordingly to the technology resources and market requirements. Nowadays, the digital signal processors have been widely employed in this area, allowing a huge amount of functions to be integrated into only one instrument, besides of the implementation of more complex algorithms. Such functions usually include evaluation of many electrical parameters, remote communication, connection to digital systems and others. This work is about a study and a development of an electric energy meter based on the digital signal processor DSP56002 by Motorola. Among the functions that are incorporated to the meter, it points out the monitoring of electric power quality, once it will be a future trend.
31
Sen, Shreyas. "Design of process and environment adaptive ultra-low power wireless circuits and systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/45755.
Повний текст джерелаАнотація:
The objective of the proposed research is to investigate the design of Self-Aware Radio Frequency Circuits and Wireless Communication Systems that can adapt to environmental and process variations to always operate at minimum power levels possible, extending battery life.
The explosive growth of portable battery operated devices has mandated design of low power circuits and systems to prolong battery life. These devices fabricated in modern nanoscale CMOS technologies suffer from severe process variation due to the reduced controllability of the fabrication process, causing yield loss. This calls for integrated low power and process tolerant design techniques, or design of systems that can adapt to its process and environment to maintain its performance while minimizing power consumption.
Currently, most of the wireless circuits are designed to meet minimum quality-of-service requirements under worst-case wireless link conditions (interference, noise, multi-path effects), leading to high power consumption when the channel is better than worst-case. In this research, we develop a multi-dimensional adaptation approach for wireless transmitters and receivers that optimally trades-off power vs. performance across temporally changing operating conditions by concurrently tuning control parameters in the RF front end to lower power consumption. Tunable circuits (e.g. LNA) with built-in tuning knobs providing independent controllability of important specifications allow optimal adaptation. Process sensing using intelligent test and calibration facilitates yield improvement and the design of process tolerant environment adaptive systems.
Low cost testing methodologies are developed for identification of the health of the wireless circuit/system. These are used in conjunction with tuning algorithms that tune a wireless system under process variation to meet performance specifications and recover yield loss. This testing and adaptation is performed once during the post manufacture test/tune phase to compensate for manufacturing variations. This can also be applied periodically during in field operation of a device to account for performance degradation due to ageing. Finally, process tolerant environment adaptive systems are designed.
32
Li, Jun 1974. "Learning average reward irreducible stochastic games [electronic resource] : analysis and applications / by Jun Li." University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000136.
Повний текст джерелаАнотація:
Includes vita.Title from PDF of title page.
Document formatted into pages; contains 111 pages.
Thesis (Ph.D.)--University of South Florida, 2003.
Includes bibliographical references.
Text (Electronic thesis) in PDF format.
ABSTRACT: A large class of sequential decision making problems under uncertainty with multiple competing decision makers/agents can be modeled as stochastic games. Stochastic games having Markov properties are called Markov games or competitive Markov decision processes. This dissertation presents an approach to solve non cooperative stochastic games, in which each decision maker makes her/his own decision independently and each has an individual payoff function. In stochastic games, the environment is nonstationary and each agent's payoff is affected by joint decisions of all agents, which results in the conflict of interest among the decision makers. In this research, the theory of Markov decision processes (MDPs) is combined with the game theory to analyze the structure of Nash equilibrium for stochastic games. In particular, the Laurent series expansion technique is used to extend the results of discounted reward stochastic games to average reward stochastic games.
ABSTRACT: As a result, auxiliary matrix games are developed that have equivalent equilibrium points and values to a class of stochastic games that are irreducible and have average reward performance metric. R-learning is a well known machine learning algorithm that deals with average reward MDPs. The R-learning algorithm is extended to develop a Nash-R reinforcement learning algorithm for obtaining the equivalent auxiliary matrices. A convergence analysis of the Nash-R algorithm is developed from the study of the asymptotic behavior of its two time scale stochastic approximation scheme, and the stability of the associated ordinary differential equations (ODEs). The Nash-R learning algorithm is tested and then benchmarked with MDP based learning methods using a well known grid game. Subsequently, a real life application of stochastic games in deregulated power market is explored.
ABSTRACT: According to the current literature, Cournot, Bertrand, and Supply Function Equilibrium (SFEs) are the three primary equilibrium models that are used to evaluate the power market designs. SFE is more realistic for pool type power markets. However, for a complicated power system, the convex assumption for optimization problems is violated in most cases, which makes the problems more difficult to solve. The SFE concept in adopted in this research, and the generators' behaviors are modeled as a stochastic game instead of one shot game. The power market is considered to have features such as multi-settlement (bilateral, day-ahead market, spot markets and transmission congestion contracts), and demand elasticity. Such a market consisting of multiple competing suppliers (generators) is modeled as a competitive Markov decision processes and is studied using the Nash-R algorithm.
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Mode of access: World Wide Web.
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Zhao, Zhiyong. "Angular Dependence of the Stopping Processes and the Yields of Ion-induced Electron Emission from Channeled MEV Protons in <100> Silicon Foils." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc279025/.
Повний текст джерела
34
Mainprize, Stephen. "Incorporating electronically monitored house arrest into British Columbia corrections : |b the processes of power, knowledge, and regulation in the debut of a punishment technique." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30638.
Повний текст джерелаАнотація:
Since 1984 in the U.S., electronic monitoring has been gradually incorporated into corrections as a means of verifying offenders' curfew compliance in programs of house arrest or home confinement. Programs of electronically monitored house arrest combine practices of community supervision found in probation, with practices of surveillance and policing found in prisons. Their combination produces a hybrid carceral form. The species of 'intermediate punishment' that is created expands the possibilities of criminal sentencing and classification. These programs have been heralded as humane and cost efficient in managing mainly 'low risk' offenders, and as a potentially effective method of dealing with prison crowding.
The recent inauguration of electronic monitoring in a program of house arrest in the province of British Columbia is the first deployment of this new type of penal form in Canada. The present research investigation focuses on this program run by the B.C. Corrections Branch. Prior to a consideration of this program as the site for the present research, a necessary task in the first part of this dissertation is to review the recent literature describing programs of electronically monitored house arrest. This review describes recent electronic monitoring programs in U.S. criminal justice and correctional spheres where virtually all developments have occurred to date.
After this literature review, the British Columbia research site is described and a summary of the findings of an exploratory research investigation describing the effects of this sanction on offenders is given. Despite methodological limitations of the research sample some important insights are provided about how this sanction works to control, punish, and discipline offenders. The main research question considered in this empirical investigation - how does this sanction affect offenders and their consociates? - is addressed through subjective reports provided by open-ended interviewing of a cohort of 60 offenders placed on electronically monitored house arrest in the B.C. EMS Pilot Project program.
The second part of the dissertation establishes a social analytic basis, drawing on the work of Michel Foucault, for critically evaluating the local use of this new correctional option. Part II of the dissertation evaluates the disciplinary and organizational or systemic effects of the deployment of this sanction within the correctional enterprise. A framework for assessing the possibility of achieving the four penal aims of punishment, incapacitation, deterrence, and rehabilitation is employed in a re-assessment of the sanction's normalizing effects and disciplinary potential. The picture provided of the achievement of these penal objectives is mixed and indicates that more research is required.
Finally, and of more overarching significance, various data sources relating to the local development and implementation of this program in B.C. are examined in order to evaluate the applicability of the hypothesis that penal reforms expand the apparatus of deviancy control, a pattern found among many recent studies of 'community-based alternatives to incarceration'. The discursive rationality accompanying the introduction of such programs suggests that costs for social control will be decreased and implies that correctional staffing can be reduced through greater efficiency. Contrary to these claims, evidence from the EMS program points to systemic expansion rather than contraction, a trend sufficiently visible to warrant further study and confirmation. The thesis concludes with a discussion of the larger significances entailed in the adoption of the new information technology, of which electronic monitoring is one pertinent example.Arts, Faculty of
Sociology, Department of
Graduate
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Hansson, Martin. "Low-Power Multi-GHz Circuit Techniques for On-chip Clocking." Licentiate thesis, Linköping : Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7545.
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Narra, Sneha Prabha. "Melt Pool Geometry and Microstructure Control Across Alloys in Metal Based Additive Manufacturing Processes." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/914.
Повний текст джерелаАнотація:
There is growing interest in using additive manufacturing for various alloy systems and industrial applications. However, existing process development and part qualification techniques, both involve extensive experimentation-based procedures which are expensive and time-consuming. Recent developments in understanding the process control show promise toward the efforts to address these challenges. The current research uses the process mapping approach to achieve control of melt pool geometry and microstructure in different alloy systems, in addition to location specific control of microstructure in an additively manufactured part. Specifically, results demonstrate three levels of microstructure control, starting with the prior beta grain size control in Ti-6Al-4V, followed by cell (solidification structure) spacing control in AlSi10Mg, and ending with texture control in Inconel 718. Additionally, a prediction framework has been presented, that can be used to enable a preliminary understanding of melt pool geometry for different materials and process conditions with minimal experimentation. Overall, the work presented in this thesis has the potential to reduce the process development and part qualification time, enabling the wider adoption and use of additive manufacturing in industry.
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Alves, Lourenço Gobira. "Analise exergoeconomica e otimização de diferentes processos de produção de hidrogenio a partir de gas metano." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265111.
Повний текст джерелаАнотація:
Orientador: Silvia Azucena Nebra de PerezTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: A alta dos preços do petróleo aliada ao aumento da participação do gás natural na matriz energética nacional força a sociedade a pensar em usos mais racionais para o gás, tanto por necessidades econômicas quanto ambientais. O hidrogênio é apontado por alguns autores como combustível do futuro, portanto aproveitar o gás natural como matéria-prima para produzir hidrogênio é uma das alternativas para melhor uso do gás. Este trabalho faz a análise exergoeconômica de dois processos básicos de produção de hidrogênio a Reforma a Vapor do Metano, SMR, e a Reforma Autotérmica do Metano, AtR, usando a Teoria do Custo Exergético, TEC, e a Análise Funcional, AF. É proposta a introdução de cogeração usando uma turbina movida a gás natural e outra movida a gás de síntese para os dois processos, gerando quatro casos de estudo onde a possibilidade de produzir excedentes para venda foi considerada. Foi feita a otimização dos processos com dois objetivos: busca da maior produção de hidrogênio e busca da menor geração de irreversibilidade. Os resultados mostram que a cogeração é uma possibilidade a ser estudada com cuidado, pois o custo de produção da eletricidade precisa ser competitivo com o mercado energético brasileiro. Os quatro casos de estudo mostraram boa flexibilidade para otimização dos processos
Abstract: The prices of Petroleum allied to the increase of the participation of the Natural Gas in the national energy matrix have forced the society to search for more rational uses for the gas by economic and environmental reasons. According to some authors, hydrogen is the fuel of the future and the production of hydrogen from natural gas is an alternative to improve the gas uses. This work performs an exergoeconomic analysis of two basic processes to produce hydrogen, Stem Methane Reforming, SMR, and Autothermal Reforming, AtR, using the Theory of Exergetic Cost, TEC, and the Functional Analysis, AF. Two cogeneration possibilities in the processes are also considered, resulting in four study cases with the possibility of producing surplus of electric energy to sell. And an optimization study is performed to improve the hydrogen production and reduce the irreversibility. The results shown that cogeneration is a useful possibility but must be applied according to the Brazilian energy market. The optimization process increased the results in the four cases
Doutorado
Termica e Fluidos
Doutor em Engenharia Mecânica
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Kremes, William de Jesus. "Retificador bridgeless SEPIC PFC com rastreamento de máxima potência para processar energia elétrica de um sistema eólico de pequeno porte." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2413.
Повний текст джерелаАнотація:
A presente dissertação tem como objetivo principal propor um conversor bridgeless SEPIC trifásico com elevado fator de potência, baseado em um conversor monofásico apresentado em Costa (2015). Como objetivo secundário e a fim de assimilar o funcionamento do conversor, é estudado o conversor monofásico e então é proposta uma modulação alternativa para comando dos transistores. Outro objetivo secundário é a aplicação do retificador proposto em um sistema de aerogerador de pequeno porte (AGPP), a fim de que este conversor possa processar a energia elétrica gerada sendo proposta também uma metodologia de controle de maximização da potência gerada (MPPT). No desenvolvimento do retificador monofásico é apresentada a análise teórica com cada modulação e posterior equacionamento. Posteriormente, são mostrados os resultados de simulação e experimentais para as duas modulações, podendo-se comparar rendimento, THD e fator de potência. As condições nominais para o conversor monofásico são: tensão eficaz de entrada de 220 V, tensão de saída de 200 V, frequência de comutação de 50 kHz e potência de saída de 500 W. Contextualizando a aplicação do retificador trifásico, é apresentado o funcionamento de um sistema de geração eólica, onde primeiramente tem-se uma introdução dos principais conceitos de energia eólica, seguido de um panorama do aproveitamento da energia eólica no mundo e no Brasil. Em seguida pode-se ver o funcionamento dos sistemas eólicos, apresentando as turbinas e geradores utilizados. Então, propõe-se um modelo, baseado em um retificador trifásico bridgeless SEPIC PFC em MCD processando a energia proveniente do aerogerador. O conversor proposto é então simulado e implementado, utilizando o método MPPT para controlá-lo, a fim de comprovar o modelo e a teoria proposta. As especificações para o conversor trifásico são: tensão eficaz de entrada de 90 V, tensão de saída de 250 V, frequência de comutação de 25 kHz e potência de saída de 1500 W.The main objective of this dissertation is to propose a three-phase bridgeless SEPIC PFC rectifier, based on a single-phase converter presented in Costa (2015). As a secondary objective and in order to assimilate the operation of the converter, the single-phase converter is studied, and an alternative modulation is proposed for controlling the transistors compared with a traditional PWM modulation, in order to obtain results that justify or not its use in the converter proposed. Another secondary objective is the application of the proposed rectifier in a small-scale wind turbine system, in order that this converter can process the electric energy generated; also is proposed a methodology of control of maximization (MPPT) of generated power. To develop this study, is presented the theoretical analysis with each modulation, followed by design equations. Subsequently are shown the results of numerical simulation and experimental for the two modulations, being able to compare efficiency, THD and power factor. The nominal conditions for the single-phase converter are: rms input voltage of 220 V, output voltage of 200 V, switching frequency of 50 kHz and output power of 500 W. Contextualizing the application of the three-phase rectifier: has an introduction of the main wind power concepts, followed by an overview of wind energy in the world and in Brazil. Then one can see the operation of wind turbines and electrical generators. Next, is propose a system based on a three-phase bridgeless PFC SEPIC rectifier in DCM processing the energy from the wind turbine. This proposed model is then simulated and implemented using the MPPT method to control it, to prove the model and the proposed theory. The specifications for the three-phase converter are: rms input voltage of 90 V, output voltage of 250 V, switching frequency of 25 kHz and output power of 1500 W.
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Goldner, Cláudia Guio Bragato. "Geração energética e processos tecnológicos sustentáveis: impasses e alternativas para o Brasil." Universidade Federal do Espírito Santo, 2002. http://repositorio.ufes.br/handle/10/6010.
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Previous issue date: 2002-10-28Este estudo dedica-se à análise da inter-relação entre paradigma tecnológico subjacente à matriz energética brasileira e meio ambiente, centrando-se no segmento de tecnologias de geração de eletricidade, numa perspectiva de crescimento sustentável. Procura refletir se a crise brasileira de suprimento energético evidenciada em abril de 2001 e as subseqüentes ações e busca de soluções para essa crise tendem a potencializar ou a obstaculizar o desenvolvimento do setor e da economia brasileira, numa perspectiva de crescimento econômico com eqüidade social e proteção ambiental, conforme preconizado no conceito de desenvolvimento sustentável. As opções tecnológicas para a geração de energia atualmente em uso e em discussão são analisadas em relação a seus aspectos positivos e negativos, em termos de geração de externalidades ambientais. A inovação tecnológica é enfocada como alternativa capaz de mudar o paradigma dos hidrocarbonetos predominante no mundo para a geração de energia elétrica. Efetua um resgate histórico da constituição e desenvolvimento do setor, das principais reformas do ambiente institucional do setor elétrico brasileiro até a atual configuração, com o intuito de conhecer os novos atores envolvidos no processo regulatório, de integração e de suporte. Os condicionantes internos e externos são analisados como fatores capazes de contribuir para, ou de retardar a adoção de uma trajetória sustentável para o setor elétrico nacional. A conclusão a que se chega é de que, apesar de o Brasil se preocupar em percorrer a trajetória de uma matriz energética limpa, num primeiro momento propiciou a adoção do Programa Prioritário de Termeletricidade que, mesmo sendo de caráter complementar ao atual parque gerador, poderá contribuir para uma dependência energética de um combustível fóssil poluente, em detrimento de outras possibilidades menos impactantes, sem garantir a não-ocorrência de futuras crises de suprimento. A mudança nos conceitos e valores da sociedade contribuirá para reestruturar a economia energética global, forçando o aumento da parcela das fontes renováveis dentro da matriz energética mundial, e permitirá a continuação do progresso econômico da humanidade, diante de uma demanda de energia maior e continuada no futuro.
The following research approaches the interaction between the technological paradigm subjacent to the Brazilian energetic power nucleus and environment, centralising on the electricity generation centre, in a sustainable growth perspective. One searches to think over whether the Brazilian power supply crisis noticed in April 2001 and consequent actions and as well as quests for solutions to the resolution of the same, tends to solve or block the sector development and the Brazilian economy in a perspective of economic growth associated to social equity and environmental protection, according to what s been prioritised by sustainable development concept. Hence, the technological options for currently used powergenerating techniques and those in discussion are analysed regarding its positive and negative aspects in terms of generating environmental external influences. Technological innovation is focused as an alternative capable of changing the hydrocarbon paradigm predominant in the world power supply generation. One does a historical rescue of the sector development, also approaching the main reforms on the Brazilian electric institutional sector up to the current configuration aimed at knowing the new sector agents involved in the regulatory process, integration, and support. Through the analysis of internal or external conditioners, one can figure their capability of contributing or delaying the adoption of a sustainable trajectory for the national electric sector. The achieved conclusion is, despite worrying on maintaining its energetic nucleus clean, Brazil, at a first moment, provided the acquiring of a Priority Thermoelectric Program , that even though having a complementary character to the actual generating park, will be able to contribute to an energetic dependence on a pollutant fossil combustible, amongst other existent possibilities, without ensuring the inexistence of the future supply crisis. The transformation in concepts, as well as society values will indeed contribute for the restructuring of global energetic economy, boosting the renewable sources portion within the world energetic nucleus and will allow humanity economic progress growth, facing a wider continuing power demand in the future.
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Ghanavati, Goodarz. "Statistical Analysis of High Sample Rate Time-series Data for Power System Stability Assessment." ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/333.
Повний текст джерелаАнотація:
The motivation for this research is to leverage the increasing deployment of the phasor measurement unit (PMU) technology by electric utilities in order to improve situational awareness in power systems. PMUs provide unprecedentedly fast and synchronized voltage and current measurements across the system. Analyzing the big data provided by PMUs may prove helpful in reducing the risk of blackouts, such as the Northeast blackout in August 2003, which have resulted in huge costs in past decades.
In order to provide deeper insight into early warning signs (EWS) of catastrophic events in power systems, this dissertation studies changes in statistical properties of high-resolution measurements as a power system approaches a critical transition. The EWS under study are increases in variance and autocorrelation of state variables, which are generic signs of a phenomenon known as critical slowing down (CSD).
Critical slowing down is the result of slower recovery of a dynamical system from perturbations when the system approaches a critical transition. CSD has been observed in many stochastic nonlinear dynamical systems such as ecosystem, human body and power system. Although CSD signs can be useful as indicators of proximity to critical transitions, their characteristics vary for different systems and different variables within a system.
The dissertation provides evidence for the occurrence of CSD in power systems using a comprehensive analytical and numerical study of this phenomenon in several power system test cases. Together, the results show that it is possible extract information regarding not only the proximity of a power system to critical transitions but also the location of the stress in the system from autocorrelation and variance of measurements. Also, a semi-analytical method for fast computation of expected variance and autocorrelation of state variables in large power systems is presented, which allows one to quickly identify locations and variables that are reliable indicators of proximity to instability.
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Jaafar, A. "Traitement de la mission et des variables environnementales et intégration au processus de conception systémique." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2011. http://tel.archives-ouvertes.fr/tel-00646708.
Повний текст джерелаАнотація:
Ce travail présente une démarche méthodologique visant le " traitement de profils " de " mission " et plus généralement de " variables environnementales " (mission, gisement, conditions aux limites), démarche constituant la phase amont essentielle d‟un processus de conception systémique. La " classification " et la " synthèse " des profils relatifs aux variables d‟environnement du système constituent en effet une première étape inévitable permettant de garantir, dans une large mesure, la qualité du dispositif conçu et ce à condition de se baser sur des " indicateurs " pertinents au sens des critères et contraintes de conception. Cette approche s‟inscrit donc comme un outil d‟aide à la décision dans un contexte de conception systémique. Nous mettons en particulier l‟accent dans cette thèse sur l‟apport de notre approche dans le contexte de la conception par optimisation qui, nécessitant un grand nombre d‟itérations (évaluation de solutions de conception), exige l‟utilisation de " profils compacts " au niveau informationnel (temps, fréquence,...). Nous proposons dans une première phase d‟étude, une démarche de " classification " et de " segmentation " des profils basée sur des critères de partitionnement. Cette étape permet de guider le concepteur vers le choix du nombre de dispositifs à concevoir pour sectionner les produits créés dans une gamme. Dans une deuxième phase d‟étude, nous proposons un processus de " synthèse de profil compact ", représentatif des données relatives aux variables environnementales étudiées et dont les indicateurs de caractérisation correspondent aux caractéristiques de référence des données réelles. Ce signal de durée réduite est obtenu par la résolution d‟un problème inverse à l‟aide d‟un algorithme évolutionnaire en agrégeant des motifs élémentaires paramétrés (sinusoïde, segments, sinus cardinaux). Ce processus de " synthèse compacte " est appliqué ensuite sur des exemples de profils de missions ferroviaires puis sur des gisements éoliens (vitesse du vent) associés à la conception de chaînes éoliennes. Nous prouvons enfin que la démarche de synthèse de profil représentatif et compact accroît notablement l'efficacité de l‟optimisation en minimisant le coût de calcul facilitant dès lors une approche de conception par optimisation.
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ARAUJO, FILHO OSCAR O. de. "Estudo comparativo de aços rápidos AISI M3:2 produzidos por diferentes processos de fabricação." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11457.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Woo, Dong Hyuk. "Designing heterogeneous many-core processors to provide high performance under limited chip power budget." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37294.
Повний текст джерелаАнотація:
This thesis describes the efficient design of a future many-core processor that can provide higher performance under the limited chip power budget. To achieve such a goal, this thesis first develops an analytical framework within which computer architects can estimate achievable performance improvement of different many-core architectures given the same power budget. From this study, this thesis found that a future many-core processor needs (1) energy-efficient parallel cores and (2) a high-performance sequential core. Based on these observations, this thesis proposes an energy-efficient broad-purpose acceleration layer that can be snapped on top of a conventional general-purpose processor. In addition to such an energy-efficient parallel cores, this thesis also proposes different architectural techniques to further boost the performance of sequential computation while those parallel cores are idle. In particular, this thesis develops low-cost architectural techniques to enhance the memory performance of a host core by utilizing those idle parallel cores. This idea is evaluated in two different system architectures: one with the aforementioned acceleration layer and the other with an emerging integrated CPU and GPU chip.
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Kennedy, Matthew D. "Power-Efficient Nanophotonic Architectures for Intra- and Inter-Chip Communication." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1458232838.
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Nordström, Tommy, and Alexander Arvidsson. "Ökad processkvalitet vid tillverkning av handhållna elverktyg med hjälp av tillämpad rotorsaksanalys." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210638.
Повний текст джерелаАнотація:
Atlas Copco is a global Swedish industrial company that develops and manufactures handheld electric and air powered tools. Their customers can be found in the automotive and aerospace industries, industrial manufacturing and maintenance, as well as in vehicle service and maintenance. This bachelor's degree project examines the ability to increase the process efficiency of the company's factory in Tierp by expanding the ability to perform further testing of the tools that show deviations at the final test. Today, extensive testing of all assembled power tools is carried out in the factory before they are sent to the customer. When a deviation is detected, the tool is repaired by replacing components in a certain order. By expanding the troubleshooting methodology, the repair process can be shortened. Based on a comprehensive database a statistical analysis has been performed which shows that approximately 47% of the tools that are unable to meet quality standards have the same error code. Over 37% of these devices are repaired by replacing the main board of the tool. This study indicates that in many cases it is not the main board which is the cause, but errors in the assembly. Using root cause analysis, structured interviews, surveys, developed test protocols and test platforms, a number of factors have been identified that can contribute to increased process quality. The thesis proposes the introduction of an expanded test platform that can help repair technicians in their work. It also suggests a number of constructional changes in the tools that prevents incorrect assembles.Atlas Copco är ett globalt svenskt industriföretag som bland annat utvecklar och tillverkar handhållna el- och tryckluftsdrivna verktyg för kunder inom fordons- och flygindustrierna, industriell tillverkning och underhåll, samt inom fordonsservice. Detta kandidatexamensarbete undersöker möjligheten att öka processeffektiviteten i företagets fabrik i Tierp genom att utöka möjligheterna att utföra ytterligare test av de verktyg som visar avvikelser vid sluttest. I fabriken genomförs idag omfattande tester av alla monterade elverktyg innan de skickas till kund. När en avvikelse upptäcks repareras verktyget genom att komponenter byts ut i en viss ordning. Genom att utöka möjligheterna till felsökning kan reparationsprocessen kortas ner. Utifrån en omfattande databas har en statistik sammanställning utförts som visar att cirka 47% av de verktyg som inte klarar sluttestet uppvisar samma felkod. Över 37% av dessa enheter repareras genom att byta verktygets huvudkort. Denna studie ger indikationer på att det i många fall inte är huvudkortet som är problemet utan felaktigheter i monteringen. Med hjälp av rotorsaksanalys, strukturerade intervjuer, enkäter och utveckling av testprotokoll samt en teststation har ett antal faktorer kunnat identifieras vilka kan bidra till en ökad processkvalitet. Undersökningen föreslår införande av en utökad testplattform som kan hjälpa reparatörerna i sitt arbete. Den föreslår även ett antal konstruktionsändringar i verktygen som omöjliggör en felaktig montering.
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Chaing, Chia-Tsung. "Five-level inverter employing WRPWM switching scheme." Diss., University of Pretoria, 2005. http://upetd.up.ac.za/thesis/available/etd-07102008-081413/.
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Euxibie, Gaillandre Edwige. "Conceptualisation de la conduite du système production-transport-consommation." Grenoble INPG, 1993. http://www.theses.fr/1993INPG0165.
Повний текст джерелаАнотація:
La conduite du Système-production-Transport-consommation est basée aujourd'hui sur une approche événementielle, avec affichage des informations dès qu'elles arrivent, sans tri préalable. L'opérateur effectue lui-même la synthèse de l'ensemble, et ne dispose pas d'outil prévisionnel à court ou moyen terme. Nous proposons dans le cadre de cette thèse une analyse de la conduite de l'opérateur, pour définir à partir de l'étude de phénomènes physiques bien identifiés, le diagnostic de l'état du Système associé à une proposition d'actions correctrices validées au préalable. Pour valider la détection des états liés à l'équilibre production-demande, la tension, la stabilité transitoire et les surcharges, nous avons développé un outil informatique appelé interface de Génération de Scénarios. Cet outil nous a permis de valider à partir de cas de référence la détection des états, et partir de là, nous avons proposé une solution techniquement réalisable et peu onéreuse pour la mise en oeuvre du concept de la conduite par états
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Chen, Shuyu. "rf power amplifier and oscillator design for reliability and variability." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5616.
Повний текст джерелаАнотація:
CMOS RF circuit design has been an ever-lasting research field. It gained so much attention since RF circuits have high mobility and wide band efficiency, while CMOS technology has the advantage of low cost and better capability of integration. At the same time, IC circuits never stopped scaling down for the recent many decades. Reliability issues with RF circuits have become more and more severe with device scaling down: reliability effects such as gate oxide break down, hot carrier injection, negative bias temperature instability, have been amplified as the device size shrinks. Process variability issues also become more predominant as the feature size decreases. With these insights provided, reliability and variability evaluations on typical RF circuits and possible compensation techniques are highly desirable. In this work, a class E power amplifier is designed and laid out using TSMC 0.18 &"181;m RF technology and the chip was fabricated. Oxide stress and hot electron tests were carried out at elevated supply voltage, fresh measurement results were compared with different stress conditions after 10 hours. Test results matched very well with mixed mode circuit simulations, proved that hot carrier effects degrades PA performances like output power, power efficiency, etc. Self- heating effects were examined on a class AB power amplifier since PA has high power operations. Device temperature simulation was done both in DC and mixed mode level. Different gate biasing techniques were analyzed and their abilities to compensate output power were compared. A simple gate biasing circuit turned out to be efficient to compensate self-heating effects under different localized heating situations. Process variation was studied on a classic Colpitts oscillator using Monte-Carlo simulation. Phase noise was examined since it is a key parameter in oscillator. Phase noise was modeled using analytical equations and supported by good match between MATLAB results and ADS simulation. An adaptive body biasing circuit was proposed to eliminate process variation. Results from probability density function simulation demonstrated its capability to relieve process variation on phase noise. Standard deviation of phase noise with adaptive body bias is much less than the one without compensation. Finally, a robust, adaptive design technique using PLL as on-chip sensor to reduce Process, Voltage, Temperature (P.V.T.) variations and other aging effects on RF PA was evaluated. The frequency and phase of ring oscillator need to be adjusted to follow the frequency and phase of input in PLL no matter how the working condition varies. As a result, the control signal of ring oscillator has to fluctuate according to the working condition, reflecting the P.V.T changes. RF circuits suffer from similar P.V.T. variations. The control signal of PLL is introduced to RF circuits and converted to the adaptive tuning voltage for substrate bias. Simulation results illustrate that the PA output power under different variations is more flat than the one with no compensation. Analytical equations show good support to what has been observed.Ph.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
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Oliveira, Adriano Gomes de Melo. "Avanço digital do Poder Judiciário: o rompimento das barreiras físicas da atuação territorial dos magistrados em razão do processo judicial eletrônico e a relativização do princípio do juiz natural." Universidade Federal do Tocantins, 2018. http://hdl.handle.net/11612/989.
Повний текст джерелаАнотація:
Esta dissertação teve por objetivo analisar a possibilidade de superar as barreiras físicas da
competência territorial dos juízes, com a finalidade de se adequar às mudanças sociais e
estruturais provenientes da nova era digital, no intuito de acompanhar as inovações
tecnológicas e implementar uma prestação jurisdicional mais eficiente. O método indutivo e
comparativo se mostrou mais viável para desvelar o desenvolvimento das tecnologias no
âmbito do Poder Judiciário, especialmente sobre a utilização do processo judicial eletrônico
na efetivação da tutela jurisdicional. A era digital trouxe nova definição sobre o espaço e
tempo, iniciando um sistema de interação social totalmente dinâmico, rápido e desprendido
das barreiras territoriais físicas. O processo judicial eletrônico também trouxe reflexos no
âmbito da tutela jurisdicional, propiciando uma justiça mais célere e voltada para acompanhar
os aspectos sociais decorrentes da era digital. O processo judicial eletrônico também
possibilitou uma melhor gerência dos processos judiciais, permitindo o acompanhamento
efetivo da atuação do judiciário. Com a possibilidade de atuação do magistrado desvinculado
da barreira física da competência territorial, pretendeu-se demonstrar a possibilidade de um
mesmo magistrado poder atuar em diversas comarcas distintas, sem que tal situação violasse o
princípio do juiz natural, possibilitando a entrega da tutela de forma rápida e eficaz. Há
necessidade de reorganização da distribuição de competências das unidades judiciárias,
desinstalando comarcas e varas, a criação de unidades judiciárias para o Núcleo de Apoio às
Comarcas, e o fortalecimento da Coordenadoria de Gestão Estratégica e Estatística e Projetos
(COGES) com vista ao maior planejamento com relação à produtividade judiciária.This dissertation aimed to analyze the possibility of overcoming as physical barriers to the territorial jurisdiction of judges, with the purpose of adapting as social and structural changes to the new digital era, with no intention to follow as technological innovations and to implement a more efficient. The inductive and comparative method proves to be more viable for the development of technologies without right to power, as well as for the use of the electronic judicial process in the execution of judicial protection. A digital age brought a new definition about space and time, initiating a system of social interaction that was totally dynamic, fast and detached from physical territorial barriers. The judicial process is also a problem of reflection, it is not the property of the judicial protection, providing a faster justice and directed to accompany the essential aspects of the digital era. The electronic judicial process also allowed a better management of judicial processes, allowing effective monitoring of the legal proceedings. With the possibility of a magistrate acting unconnected to the physical barrier of territorial jurisdiction, it was intended to demonstrate the possibility of a single magistrate being able to act in several distinct districts, without which this situation violates the principle of the natural judge, fast and effective. The need to reorganize the distribution of competencies of the judicial units, uninstalling areas and sticks, the creation of judicial units for the Nucleus of Support to the Counties, and the strengthening of the Coordination of Strategic Management (COGES) aiming at greater planning with respect to judicial productivity.
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Herbinet, Olivier. "Etude expérimentale et modélisation de la décomposition thermique de l'exo-tricyclo[5.2.1.0(2.6)]décane." Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2006. http://tel.archives-ouvertes.fr/tel-00154552.
Повний текст джерелаАнотація:
La décomposition thermique de l'exo-tricyclo[5.2.1.02,6]décane, un alcane tricyclique quirentre dans la composition de carburants utilisés en aéronautique, a été étudiée aux DCPR
dans le cadre du développement du système de refroidissement du moteur de véhicules
hypersoniques.
L'étude expérimentale de la décomposition thermique de cet alcane a été réalisée avec un
réacteur auto agité par jets gazeux, à pression atmosphérique, à haute dilution, pour des temps
de passage compris entre 0,5 et 6s et sur une large gamme de température (673-1173 K). Cette
étude a permis de mettre en évidence la formation de 53 produits de la réaction.
Un mécanisme de la pyrolyse de l'exo-tricyclo[5.2.1.02,6]décane a été développé (2789
réactions ; 929 espèces moléculaires, radicalaires et biradicalaires) et a été validé à partir des
résultats expérimentaux. L'analyse cinétique du mécanisme a permis de souligner
l'importance des réactions d'amorçage unimoléculaire sur la consommation du réactif.