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Rozprawy doktorskie na temat „And THD”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Ljungqvist, Pär. "Evaluaton of sound-, current, and vibrations measurements in the Electric Arc Furnace." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160542.

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The aim of this report was to investigate new methods for measuring the condition of the scrap in the electric arc furnace. This was done by evaluating three different methods theoretically and chooses two of them for test in the electric arc furnace in Avesta. Due to lack of time and equipment only Total harmonic distortion (THD) measurements was used. The results show that THD reaches low values during refining. This suggests that all the scrap is melted and the arcs are stable.

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2

Liu, Xiyang. "Measurement of Delta-Sigma Converter." Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-9701.

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With today’s technology, digital signal processing plays a major role. It is used widely in many applications. Many applications require high resolution in measured data to achieve a perfect digital processing technology. The key to achieve high resolution in digital processing systems is analog-to-digital converters. In the market, there are many types ADC for different systems. Delta-sigma converters has high resolution and expected speed because it’s special structure. The signal-to-noise-and-distortion (SINAD) and total harmonic distortion (THD) are two important parameters for delta-sigma

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3

Dunipace, Richard Alan. "Increasing the Dynamic Range of Audio THD Measurements Using a Novel Noise and Distortion Canceling Methodology." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4156/.

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The objective of this study was to determine how a new experimental methodology for measuring Total-Harmonic-Distortion (THD) of operational amplifiers functioned when compared with two standard methodologies, and whether the new methodology offers any improvement in noise floor and dynamic range along with distortion canceling of the sine-wave source used in the testing. The new methodology (THD) is being tested against two standard methodologies: Spectral Analysis using a tuned receiver type Spectrum Analyzer with Notch Filter pre-processing, and a digitized Fast Fourier Transform (FFT) usin

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4

Sweeney, Paul. "THE NEXT GENERATION AIRBORNE DATA ACQUISITION SYSTEMS PART II – SPECIFICATION, TRADE-OFFS AND SOME LESSONS LEARNED." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605360.

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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>The advent of a new generation of analog to digital converters (ADC’s) provides the aerospace signal-conditioning engineer with many design advantages, trade-offs and challenges for their next generation of signal conditioning systems. These advantages include increased range, resolution, accuracy, channel-count and sampling rate. However, in order to capitalize on these advantages, it is important to understand the trade-offs involved and to specify these sys

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5

Vesterberg, Henrik. "Utredning och åtgärder angående övertoner vid pappersindustri." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70762.

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Detta arbete behandlar ämnet elkvalité vid en industri i Sverige. Arbetet utfördes vid Vattenfall Eldistribution och elkvalitégruppen. Elkvalité är ett begrepp som innefattar flera egenskaper hos spänningen i vårt elnät. För Vattenfalls del pratar man om ”God elkvalité” Enligt företaget skall det alltid finnas marginal mellan god elkvalité och gällande standarder och föreskrifter. Svensk Standard EN50160 med tillägget A1 är den gällande standarden inom elkvalité och där detta arbete har som utgångspunkt att leva upp till de nivåer som är beskrivna i standarden. Det är med tonvikt på spänningsd

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6

Zubi, Hazem M. "A genetic algorithm approach for three-phase harmonic mitigation filter design." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604881.

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In industry, adjustable speed drives (ASDs) are widely employed in driving AC motors for variable speed applications due to the high performance and high energy efficiency obtained in such systems. However, ASDs have an impact on the power quality and utilisation of AC power feeds by injecting current harmonics and causing resonances, additional losses, and voltage distortion at the point of common coupling. Due to these problems, electric power utilities have established stringent rules and regulations to limit the effects of this distortion. As a result, efficient, reliable, and economical h

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7

Souza, Wesley Angelino de [UNESP]. "Desenvolvimento de sistema de aquisição e processamento para aplicações em qualidade de energia." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/87201.

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Made available in DSpace on 2014-06-11T19:22:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-08-19Bitstream added on 2014-06-13T20:49:15Z : No. of bitstreams: 1 souza_wa_me_bauru.pdf: 3309362 bytes, checksum: a37e3a04f60e9ebbd2f490264d198dbf (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Este trabalho teve como o desenvolvimento de um sistema de aquisição e processamento de dados para aplicações em Qualidade de Energia Elétrica (QEE). Do ponto de vista dos circuitos de hardware desenvo

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8

Garcia, Mathieu. "Refrigerant-lubricated gas foil bearings : A thermo-hydrodynamic study (application to rigid bearings)." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0133/document.

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Des études internes à Liebherr-Aerospace France, concernant la conception de nouveaux compresseurs lubrifiés par gaz réfrigérant, ont montré que dans des conditions de fonctionnement spécifiques, un mélange de vapeur et de liquide apparaît au sein du compresseur, au lieu d'une phase vapeur seule. De ce fait, le comportement des paliers à feuilles lubrifiés au gaz réfrigérant est étudié, y compris la possibilité d'un écoulement diphasique du lubrifiant. L'étude porte sur le comportement du lubrifiant uniquement, dans des conditions de fonctionnement qui sont celles des paliers à feuilles. L'app

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9

Queluz, Dagmar de Paula 1961. "Perfil dos profissionais auxiliares da odontologia (THD e ACD) e suas implicações no mercado de trabalho." [s.n.], 2002. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290303.

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Tese (livre-docencia) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba<br>Made available in DSpace on 2018-08-03T15:46:19Z (GMT). No. of bitstreams: 1 Queluz_DagmardePaula_LD.pdf: 1710899 bytes, checksum: 95a21a2f213a545c99f08ee2dfce5eb8 (MD5) Previous issue date: 2002<br>Resumo: O presente estudo tem como propósito, demonstrar o perfil dos profissionais auxiliares da Odontologia (Atendente de Consultório Dentário e Técnico em Higiene Dental) e suas implicações no mercado de trabalho: segundo as características demográficas e profissionais (formação e atribuições d

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10

Goenaga, Ekaitz. "Conception d’alimentations de puissance d’actionneurs piézo-électriques, avec et sans contact électrique, pour la génération des vibrations mécaniques." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENT103/document.

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Les travaux de thèse présentés dans ce manuscrit portent sur l’alimentation d’actionneurs de type piézo-électrique qui seront placés sur la partie tournante d’une perceuse. Ces actionneurs possèdent un comportement capacitif et sont habituellement alimentés par des systèmes linéaires. Une étude de dimensionnement et de conception a été menée sur différents amplificateurs à découpage qui peuvent fournir, dans un repère fixe, un signal de puissance sinusoïdal à fréquence variable dans les meilleures conditions possibles (rendement et THD). Ensuite, un système pouvant transférer l’énergie sans co

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11

Silva, Ranoyca Nayana Alencar LeÃo e. "Inversor MultinÃvel HÃbrido SimÃtrico TrifÃsico de Cinco NÃveis Baseado na Topologias Half-Bridge/ANPC." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9817.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Este trabalho apresenta uma topologia de inversor multinÃvel hÃbrido simÃtrico trifÃsico de cinco nÃveis, concebido a partir das estruturas meia ponte e inversor com grampeamento ativo do neutro, adequado para aplicaÃÃes com alta tensÃo e alta potÃncia. SÃo apresentados os possÃveis estados de comutaÃÃo, lÃgica de acionamento, cÃlculo dos esforÃos nos semicondutores, assim como um estudo de perdas. Duas estratÃgias de modulaÃÃo sÃo selecionadas possibilitando a operaÃÃo concomitante de metade dos interruptores em baixa frequÃncia (

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12

Souza, Wesley Angelino de. "Desenvolvimento de sistema de aquisição e processamento para aplicações em qualidade de energia /." Bauru : [s.n.], 2011. http://hdl.handle.net/11449/87201.

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Resumo: Este trabalho teve como o desenvolvimento de um sistema de aquisição e processamento de dados para aplicações em Qualidade de Energia Elétrica (QEE). Do ponto de vista dos circuitos de hardware desenvolvidos, buscou-se utilizar componentes de precisão elevada para o sensoriamento e condicionamento dos sinais de tensão e corrente. Além disso, foi implementado um algoritmo de auto calibração das medidas, em função da temperatura no medidor implementado. O processamento dos dados foi realizado através de um processador digital de sinais (DSP, Digital Sinal Processor) de 32 bits, com aritm

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13

Musil, Libor. "Inteligentní zásuvka pro výčet elektrických parametrů a ovládání připojeného zařízení." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413096.

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Thesis deals with the design of intelligent electrical socket. At the beginning of the thesis, there are described the characteristics of the distribution network in the Czech Republic and the ways of measuring these properties. The selected integrated circuit that realizes the measurement is described in detail. The third chapter deals with the current possibilities of power management, especially from the perspective of the distribution company and the concept of smart networks. The fourth chapter deals with the selection of communication interface suitable for smart socket as an element of

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14

Laurutis, Žygimantas. "Garsinio signalo psichoakustinis įvertinimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140717_112234-00131.

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Darbe tiriami iškraipymai audio sistemose ir kaip žmogaus klausa juos suvokia. Autorius sistemina tyrimus, bibliografinius įrašus. Pateikiama alternatyvi tyrimo metodika. Tyrimo rezultatai reikšmingi tobulinant garsinio signalo traktą.<br>This research is about distortion in audio systems and how human hearing perceives it. Author collects together data from other researches and compares them. The main goal of this research is to find, what type of audio distortion is most audible. Results of the work can be used to improve audio equipment design with properties of human hearing in mind.

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15

Hasan, Md Naimul. "A Compact Low Power Bio-Signal Amplifier with Extended Linear Operation Range." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1358074945.

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16

Mazumdar, Joy. "System and method for determining harmonic contributions from nonlinear loads in power systems." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/23215.

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The objective of this research is to introduce a neural network based solution for the problem of measuring the actual amount of harmonic current injected into a power network by an individual nonlinear load. Harmonic currents from nonlinear loads propagate through the system and cause harmonic pollution. As a result, voltage at the point of common coupling (PCC) is rarely sinusoidal. The IEEE 519 harmonic standard provides customer and utility harmonic limits and many utilities are now requiring their customers to comply with IEEE 519. Measurements of the customer’s current at the PCC are exp

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17

Jihad, Hamza El. "Contribution à l'étude des convertisseurs multi-niveaux moyenne tension : réduction d'harmoniques BF et linéarisation de leur tension." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0175.

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Cette thèse traite des convertisseurs de puissance multi-niveaux destinés aux applications d’entraînements électriques, utilisés notamment dans le domaine de l’Oil & Gas et de la propulsion marine, ou bien aux applications réseaux comme la compensation de l’énergie réactive. L’objectif est l’optimisation des commandes de ces convertisseurs de façon à réduire le contenu harmonique de la tension de sortie et donc du courant, paramètre très important pour le dimensionnement à la fois des filtres de sortie et des machines électriques qui y sont connectées. Dans la première partie de ce mémoire

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18

Radzikhovskiy, Arkadiy [Verfasser], and Rudolf [Akademischer Betreuer] Hesterberg. "Langzeitergebnisse der Hämorrhoidenbehandlung in Stadien 2 und 3 mittels THD (transanale Hämorrhoidendearterilisation) kombiniert mit Mukopexie / Arkadiy Radzikhovskiy. Betreuer: Rudolf Hesterberg." Marburg : Philipps-Universität Marburg, 2016. http://d-nb.info/1102354333/34.

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19

Poissonnier, Hugues. "Proposition d'un cadre d'analyse du contrôle inter-organsationnel fondé sur la chaîne de contrôle : une étude centrée sur la filière THD." Montpellier 2, 2005. http://www.theses.fr/2005MON20164.

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20

Zanetti, Francesco. "Analisi teorica e sperimentale di uno schema di controllo per convertitori fotovoltaici monofase di tipo transformerless." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Il tema centrale dell’elaborato è lo studio dell’efficienza e del THD di due inverter monofase di tipo transformerless indicati comunemente con la sigla H6; uno è stato realizzato in silicio e l’altro in carbonato di silicio Nel primo capitolo è stato presentato il classico impianto fotovoltaico domestico, le normative che lo riguardano e le problematiche tecniche che lo caratterizzano; nel secondo capitolo invece sono state illustrate le varie tecniche di modulazione che è possibile attuare con la struttura dell’inverter H6 e si sono riportate anche le principali caratteristiche del nuovo ma

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21

Zubi, Hazem. "Lowpass Broadband Harmonic Filter Design." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606587/index.pdf.

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In this thesis an analytical design method of the improved broadband passive harmonic filter (IBF) for three phase diode rectifier front-end type adjustable speed drives is presented. The method is based on frequency domain modeling of the rectifier and filter. The success of the method involves accurate representation of the load harmonics. With the harmonics well defined, the harmonic and fundamental frequency equivalent circuits are utilized to analytically calculate the voltages/currents. Thus, the size and the performance of the filter can be optimized. The analytical method is verified v

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22

Hoppen, Hueslei. "Análise das relações das tensões de entrada de inversores multiníveis híbridos conectados em cascata para minimizar a THD da tensão de saída." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/8509.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This Master Thesis presents a study considering multilevel inverters formed from two and three level cascaded inverters. The literature presents several papers on asymmetric multilevel inverters and most studies are related to control and/or modulation techniques considering a binary or trinary topology. Also, there are studies that consider a small variation of the inverters input voltage and analyses the system behavior. However, any of these studies performs analysis to obtain the best relation between input voltage of the multi

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23

Valkoun, Petr. "Proudy ve středních vodičích napájecích sítí a jejich důsledky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217595.

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This work deals with an origin of the harmonic currents, their classification into symmetrical components and their influence on neutral conductor in distribution systems. It analyses the heat strain increase in distribution cables and distortion of supply tension in consequence of harmonic zero component flows in distribution system and it provides possibilities of neutral conductor overload and break-in protection.

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24

Vidal, Barba Oriol. "Systèmes de communication par satellite géostationnaire à très haute capacité de prochaine génération. Techniques avancées de gestion des interférences." Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0035/document.

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Cette thèse à pour but d'étudier des alternatives à l’augmentation des faisceaux dans des systèmes satellite THD deprochaine génération, évaluant des stratégies pour augmenter de manière significative la capacité totale du système. Dansce contexte, les schémas de réutilisation de fréquence (FR) agressives viennent naturellement dans l'esprit afin d'augmenterles ressources globales en bande passante et, par conséquent, augmenter la capacité globale du système. Cependant, cesschémas mènent à une augmentation des interférences co-canal, rendant l'utilisation du spectre supplémentaire pastellement

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25

Goenaga, Ekaitz. "Conception d'alimentations de puissance d'actionneurs piézo-électriques, avec et sans contact électrique, pour la génération des vibrations mécaniques." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00875503.

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Les travaux de thèse présentés dans ce manuscrit portent sur l'alimentation d'actionneurs de type piézo-électrique qui seront placés sur la partie tournante d'une perceuse. Ces actionneurs possèdent un comportement capacitif et sont habituellement alimentés par des systèmes linéaires. Une étude de dimensionnement et de conception a été menée sur différents amplificateurs à découpage qui peuvent fournir, dans un repère fixe, un signal de puissance sinusoïdal à fréquence variable dans les meilleures conditions possibles (rendement et THD). Ensuite, un système pouvant transférer l'énergie sans co

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26

Zhang, Di. "Analysis and Design of Paralleled Three-Phase Voltage Source Converters with Interleaving." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/27579.

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Three-phase voltage source converters(VSCs) have become the converter of choice in many ac medium and high power applications due to their many advantages, including low harmonics, high power factor, and high efficiency. Modular VSCs have also been a popular choice as building blocks to achieve even higher power, primarily through converter paralleling. In addition to high power ratings, paralleling converters can also provide system redundancy through the so-called (N+1) configuration for improved availability, as well as allow easy implementation of converter power management. Interleaving c

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27

Bisulli, Lorenzo. "Progetto e analisi di tecniche di modulazione pwm per inverter trifase." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21387/.

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Lo scopo della tesi era quello di analizzare vari parametri delle principali modulazioni PWM per inverter trifase in modo da distinguere quali fossero le più efficienti o le più affidabili. A tale scopo, è stata dapprima effettuata una panoramica dell’inverter trifase e delle relative modulazioni. Sono stati quindi scritti vari codici in Matlab per simulare le diverse tecniche di modulazione. Le modulazioni presentate in questo testo (con i rispettivi codici) sono: Sinusoidal PWM, THIPWM, SVPWM, DSVPWM (0,1,2,3,+,-), ASDSVPWM, Six-step (implementata solo per effettuare un confronto). Al term

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Battikh, Arij. "Développement d’une tête de réception numérique innovante pour réception de télécommunications par satellite en Bande X." Thesis, Limoges, 2020. http://www.theses.fr/2020LIMO0012.

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Cette thèse réexamine l’architecture des récepteurs de station sol de télécommunications par satellites (SATCOM) en mettant en oeuvre des briques technologiques innovantes de sous-échantillonnage / numérisation RF et de duplexeur de polarisation numérique (DOMT). Un démonstrateur fonctionnant en Bande X a été étudié et conçu à partir de ces briques technologiques. Le sous-échantillonnage des signaux RF est réalisé grâce à la technologie Track and Hold Amplifier (THA) qui permet d’échantillonner des signaux dont la bande passante couvre plusieurs GHz (DC-13 GHz dans le cadre de ce travail). Une

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29

Earick, Weston R. "DESIGN OF A HIGH-POWER, HIGH-EFFICIENCY, LOW-DISTORTION DIRECT FROM DIGITAL AMPLIFIER." Wright State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=wright1155008919.

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Dehghanikiadehi, Abbas. "Commande vectorielle innovante pour véhicules électriques ou hybrides." Thesis, Université Clermont Auvergne‎ (2017-2020), 2017. http://www.theses.fr/2017CLFAC012/document.

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Durant ces dernières années, l'intérêt pour les technologies des véhicules à faibles émissions de carbone a fait un bond important à travers l'Union européenne (UE) et au-delà, encouragé en cela par les gouvernements et les constructeurs automobiles. De grands espoirs ont été mis plus récemment dans les véhicules électriques (VE) et les véhicules électriques hybrides (VEH) en tant que technologies clés pour atténuer le changement climatique, améliorer la sécurité énergétique et favoriser une nouvelle branche de l'industrie dans le secteur automobile. Ainsi, l'électrification des transports a é

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31

Friml, Vilém. "Měření nelineárních vlastností reproduktorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413247.

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This thesis deals with calculation of THD dependency on signal frequency and calculation of Rub & buzz distortion using MATLAB software. Thesis includes generation of signals suited for THD measurement, playback and recording using sound card and APx series 500 device. The APx device controlling and data acquisition by MATLAB is also addressed. Loudspeaker electric model is discussed for the use of Rub & buzz measurement.

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32

Deilami, Sara. "Optimal dispatch of shunt capacitors and load tap changers in distorted distribution systems using ant colony algorithms." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/92.

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This thesis investigates the performances of a class of intelligent system algorithms in solving the volt/VAr/THD control problem for large distribution systems. For this purpose, optimal dispatch of Load Tap Changers (LTCs) and Switched Shunt Capacitors in distribution networks with high penetration of nonlinear loads is studied. The optimization problem consists of determination of LTC positions, switched shunt capacitors statuses and proper coordination of these switched elements such that power loss is minimized, voltage profile is improved and total harmonic voltage distortion (THDv) is a

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33

Tiendrebeogo, Telesphore. "Système dynamique et réparti de nommage à indirections multiples pour les communications dans l'Internet." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00841591.

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Le routage dans Internet est basé sur des tables dites de routage, formées de blocs d'adresses IP. Cependant, la construction et la maintenance de telles tables de routage nécessitent l'utilisation de protocoles complexes qui ne passent pas à l'échelle en termes de mémoire et d'utilisation CPU. De plus, l'expérience montre que le plan d'adressage IP est insuffisant, car la sémantique d'une adresse IP est à la fois un identificateur et un localisateur. Dans nos travaux, nous proposons un système de réseau recouvrant pair-à-pair libre de toute contrainte topologique et utilisant des coordonnées

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Sahoo, Smrutirekha. "Impact Study: Photo-voltaic Distributed Generation on Power System." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-32369.

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The grid-connected photo-voltaic (PV) system is one of the most promising renewable energy solutions which offers many benefits to both the end user and the utility network and thus it has gained the popularity over the last few decades. However, due to the very nature of its invariability and weather dependencies, the large scale integration of this type of distributed generation has created challenges for the network operator while maintaining the quality of the power supply and also for reliable and safe operations of the grids. In this study, the behavioral impact of large scale PV system

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Demirkutlu, Eyyup. "Output Voltage Control Of A Four-leg Inverter Based Three-phase Ups By Means Of Stationary Frame Resonant Filter Banks." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608151/index.pdf.

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A method for high performance output voltage control of a four-leg inverter based three-phase transformerless UPS is proposed. Voltage control loop is employed and the method employs stationary frame resonant filter controllers for the fundamental and harmonic frequency components. A capacitor current feedback loop provides active damping and enhances the output voltage dynamic performance. The controller design and implementation details are given. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considered. The steadystate and dynamic performance of the UP

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Cetinkaya, Suleyman. "Repetitive Control Of A Three-phase Uninterruptible Power Supply With Isolation Transformer." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608150/index.pdf.

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A repetitive control method for output voltage control of a three phase uninterruptible power supply (UPS) with isolation transformer is investigated. In the method voltage control loop is employed in the stationary dq frame. The controller eliminates the periodic errors on the output voltages due to inverter voltage nonlinearity and load disturbances. The controller design and implementation details are given. The controller is implemented on a 5-kVA UPS prototype which is constructed in laboratory. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considere

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Moussa, Hassan. "Contribution to the Decentralized Energy Management of Autonomous AC-Microgrid." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0161/document.

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Cette thèse porte sur des micro-réseaux AC isolées qui permettent l’intégration des ressources énergétiques distribuées (DER) pouvant fournir leur énergie d'alimentation existante de manière contrôlée pour assurer le bon fonctionnement global du système. L'interconnexion d'un DER à une micro-réseau s'effectue habituellement en utilisant un convertisseur d'interface distribué (DIC) (i.e. un bloc d'interface d'électronique de puissance générale) qui est constitué d’un module de convertisseur à l'entrée de la source, un onduleur de tension (VSI), un module d'interfaçage de sortie, et le module de

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Santos, Felipe Santana. "Planejamento integrado de filtros harmônicos e reguladores de tensão em sistemas de distribuição utilizando um algoritmo multiobjetivo." Universidade Federal de Sergipe, 2017. https://ri.ufs.br/handle/riufs/5040.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The increase in linear and non-linear loads experienced by Brazil in recent years has changed the way distribution networks are planned and Operated. In addition, the competitiveness of the market and the demand for the improvement in power quality indexes mean that current e orts are increasingly focused on areas such as voltage profile control and voltage harmonic distortion control. This work deals, exactly, with the Integrated control of voltage and harmonic voltage distortion (volt/thd) in distribution systems, wi

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Pirié, Estelle. "Etudes récentes sur le thé ("Camellia sinensis") : le thé inattendu." Lille 2, 1992. http://www.theses.fr/1992LIL2P022.

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Neužil, Jan. "Uživatelské rozhraní pro HP89410A." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217775.

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The aim of this thesis was to develop user interface in LabVIEW to make typical measurements with spectral analyzer HP89410A There is introduced the theory of operation of an analogue heterodyne and a digital FFT spectral analyzer. It is explained the background of the Fast Fourier Transform. There are discussed the key settings in measuring with FTT analyzer, like window function, bandwidth, number of frequency points, or the averaging. Further is described the program, which was developed for measuring frequency characteristic by white noise and by stepped measurement. It was also made a mod

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Miksl, Jan. "Analýza, vlastnosti a aplikace komerčně dostupných proudových násobiček." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219150.

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The diploma thesis deals with analysis, validation, measurement of parameters of the commercially available current multiplies (namely the EL2082 and EL4083) and their applications in practice. Control analysis are carried out in OrCAD PSpice program and compared with values from datasheets. Control analysis are focused on AC and DC characteristics of these active blocks. There are discusses the input impedance, the output impedance, the current gain and the possibility of electronic adjusting. The parameters of the elements were verified by measurements. Proposals for circuit applications (se

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Vena, Arnaud. "Contribution au développement de la technologie RFID sans puce à haute capacité de codage." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00922982.

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Malgré les nombreux avantages que procure la RFID, son déploiement demeure freiné par plusieurs facteurs aussi bien économiques, que technologiques. Parmi ces freins, on peut citer le coût encore trop élevé des tags, le manque de fiabilité et de sécurité dans les informations contenues dans la puce RFID mais aussi les aspects "recyclage" des tags. Dans cette thèse nous nous focalisons sur le développement de tags RFID sans puce, qui représentent une nouvelle famille de tags bas coût. Avec cette technologie, l'information est extraite à partir de la réponse électromagnétique du tag qui dépend u

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Moussa, Hassan. "Contribution to the Decentralized Energy Management of Autonomous AC-Microgrid." Electronic Thesis or Diss., Université de Lorraine, 2017. http://www.theses.fr/2017LORR0161.

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Cette thèse porte sur des micro-réseaux AC isolées qui permettent l’intégration des ressources énergétiques distribuées (DER) pouvant fournir leur énergie d'alimentation existante de manière contrôlée pour assurer le bon fonctionnement global du système. L'interconnexion d'un DER à une micro-réseau s'effectue habituellement en utilisant un convertisseur d'interface distribué (DIC) (i.e. un bloc d'interface d'électronique de puissance générale) qui est constitué d’un module de convertisseur à l'entrée de la source, un onduleur de tension (VSI), un module d'interfaçage de sortie, et le module de

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Podgaec, Sérgio. "Padrões de resposta imune em pacientes com endometriose." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/5/5139/tde-31102006-105026/.

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Objetivo: O objetivo deste estudo foi analisar a relação e a predominância dos padrões de resposta imune Th1 e Th2 em pacientes com endometriose. Pacientes e Métodos: Entre Fevereiro de 2004 e Abril de 2005 foram avaliadas 98 pacientes divididas em dois grupos de acordo com a presença (Grupo A) ou ausência de endometriose (Grupo B), confirmada histologicamente. Foram coletados sangue periférico e fluido peritoneal de todas as pacientes para a dosagem de interleucinas (IL) 2, 4 e 10, fator de necrose tumoral-alfa (TNF-alfa) e interferon-gama (IFN-gama) por citometria de fluxo. Além da presença

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Strzelczyk, Barbara. "Cytokin mRNA profil i perifera mononukleära celler hos barn med födoämnesallergi." Thesis, Umeå universitet, Biomedicinsk laboratorievetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-58649.

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Nineham, Chris. "Making the news : the media and the movement against the Iraq War." Thesis, University of Westminster, 2013. https://westminsterresearch.westminster.ac.uk/item/8z107/making-the-news-the-media-and-the-movement-against-the-iraq-war.

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What follows is an investigation of unusual media behaviour. The 2003 Iraq War precipitated a series of demonstrations of unprecedented scale in a cause that often had majority support and challenged the authority of the government. The media’s well documented tendency to marginalise or ignore protest was at least partly suspended as newspapers cleared their front pages to report on demonstrations and the BBC sent senior journalists to interview marchers. For once, protesters were making the news. My research has revealed a very different pattern of reportage to that anticipated by the widely

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MERLOT, Élodie. "Modulation de la production de cytokines par l'environnement." Phd thesis, Institut national agronomique paris-grignon - INA P-G, 2003. http://tel.archives-ouvertes.fr/tel-00007518.

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Les conséquences immunitaires d'un stress d'origine environnementale sont complexes et encore difficilement prévisibles. Le stress affecte le système immunitaire soit en agissant sur l'immunité innée, en altérant la réactivité inflammatoire, soit en agissant sur l'immunité acquise, en modulant la production de cytokines dites Th1 et Th2. L'environnement social<br />contribue largement au développement et à l'expression de maladies. Dans les espèces sociales, la position sociale occupée dans le groupe module la susceptibilité aux infections mais les supports endocriniens et immunitaires de ces

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Costa, Fernando Augusto Miranda da. "Resposta imune in vitro aos antígenos de Papilomavírus Humano (HPV) em homens na cidade de São Paulo, Brasil." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/5/5133/tde-04022014-155625/.

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Introdução: O Papilomavírus Humano está muito bem associado com diversos tipos de cânceres humanos, como câncer anogenital e oral. Alguns estudos demonstram que o aparecimento de lesões e a progressão para o câncer estão relacionados ao tipo de resposta imune do hospedeiro. Deste modo, evidências indicam que a resposta imune do hospedeiro tem um papel muito importante para o curso da infecção pelo HPV. Objetivo: Avaliar a resposta imune específica in vitro ao Papilomavírus Humano (HPV) em homens com lesões causadas por HPV e sem lesão por HPV. Material e Métodos: Foram recrutados 31 pacientes

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Persson, Marie, Christina Ekerfelt, Jan Ernerudh та ін. "Reduced IFN-γ and IL-10 responses to paternal antigens during and after pregnancy in allergic women". Linköpings universitet, Institutionen för klinisk och experimentell medicin, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-84900.

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Normal pregnancy and allergy are both characterized by a T helper (Th) 2 deviation. In the current study, we hypothesized that paternal antigen-induced cytokine responses during pregnancy would be deviated toward Th2 and an anti-inflammatory profile, and that the Th2 deviation would be more pronounced in allergic pregnant women. Blood samples were collected longitudinally on three occasions during pregnancy and two occasions post partum (pp). Of the 86 women initially included, 54 women had a normal pregnancy and completed the sampling procedures. Twelve women fulfilled the criteria for allerg

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Zhang, Ping. "The selective effect of dietary n-3 polyunsaturated fatty acids on murine Th1 and Th2 cell development." Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/4148.

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To examine how dietary n-3 polyunsaturated fatty acids affect Th2 cell development, female C57BL/6 mice were fed a washout corn oil (CO) diet for 1 wk followed by 2 wk of either the same CO diet or a fish oil (FO) diet. CD4+ T cells were isolated from spleens and cultured under both neutral (anti-CD3 and phorbol myristate acetate (PMA)) and Th2 polarizing conditions (anti-CD3 and PMA, in presence of rIL-4, rIL-2, and anti-IFN-ÃÂ³) in the presence of homologous mouse serum (HMS) or fetal bovine serum (FBS) for 2 d. Dietary n-3 PUFA significantly enhanced Th2 cell development and suppressed Th1

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