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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
61

Técnicas de control robusto basado en modelo de referencia aplicadas a sistemas modulares de alimentación

Pascual Molto, Marcos 07 May 2008 (has links)
Los sistemas de conversión conectados en paralelo constituyen una solución interesante al problema de proporcionar una tensión regulada a una carga que demanda corrientes elevadas, pues la paralelización de convertidores permite distribuir la corriente entre los diversos módulos, reduciendo el estrés sobre los interruptores y mejorando la fiabilidad del sistema. En sistemas multimodulares de convertidores se necesita normalmente un esquema de control modo corriente, como el control modo corriente media (ACC en inglés), que asegure una correcta compartición de corriente entre los distintos módulos. Con este tipo de control, las características dinámicas del lazo de control dependen considerablemente de las condiciones de línea y carga, así como del número de módulos conectados en paralelo. En esta tesis se han aplicado dos técnicas diferentes de control robusto basado en modelo de referencia (RMF en inglés) a sistemas de conversión en paralelo con el fin de mejorar la robustez del control ACC convencional. El trabajo realizado puede dividirse en tres grandes bloques: En primer lugar, se ha presentado un esquema de control RMF paso-alto que ha sido aplicado al lazo de tensión de un convertidor DC-DC multimodular tipo Buck. El esquema de control propuesto añade un lazo interno adicional a los lazos de corriente y de tensión del control ACC convencional, reduciendo la sensibilidad del lazo externo de tensión frente a los parámetros variables de la etapa de potencia: número de módulos, tensión de entrada, carga y tolerancias de los componentes. Además, el lazo mejora considerablemente el rechazo de perturbaciones del convertidor, esto es, impedancia de salida y audiosusceptibilidad en lazo cerrado, en baja frecuencia si se compara con el control ACC convencional. La principal limitación de este esquema de control es que su funcionamiento está limitado por el rizado de conmutación presente en la tensión de salida, dado que se utiliza un regulador auxiliar...... / Pascual Molto, M. (2008). Técnicas de control robusto basado en modelo de referencia aplicadas a sistemas modulares de alimentación [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/1981
62

Sustainable urban development at Sai Ying Pun: teahouse

Chung, Ho-wai, Edwin., 鍾浩維. January 2001 (has links)
published_or_final_version / Architecture / Master / Master of Architecture
63

Sathya Sai Baba as Avatar: "His Story" and the History of an Idea

Spurr, Michael James January 2007 (has links)
I begin this thesis with a brief account of my meetings with popular South Indian guru Sathya Sai Baba (1926- ) and very brief a discussion of recent fraud and sexual abuse allegations that have been made against him. I note that one of the key factors involved in this, also accountable for his extraordinary popularity, is his divine persona-especially his self-proclaimed identity as "the avatar"-and I review previous academic studies pertaining to this. In contrast to most previous studies of Sathya Sai Baba, which align him primarily with Śaiva traditions and with the "Sai Baba movement", I note a strong (and long running) affinity in his ideas for Vaiṣṇava traditions (especially the Bhagavad-Gītā and the Bhāgavata-Purāṇa), and I add that his background as a member of a traditionally highly regarded bardic caste may have contributed to his divine persona. I further investigate this persona via a history of potentially parallel traditional and modern avatar ideas. I show something of the manner in which many of the avatar concepts and myths to which Sathya Sai Baba refers originated and developed, especially invoking the episteme of "resemblance", posited by Brian Smith, the idea of "inclusivism"-which I adapt from the work of Paul Hacker and Wilhelm Halbfass-and traditional (Sāṁkhya) processes of "distinction", "categorization", and "enumeration". In addition to these, I much refer to Max Weber's analysis of "pure types" of authority-traditional, charismatic, and rational-showing that Sathya Sai Baba draws upon all of these in legitimating his claim to be "the avatar". I also show that his divine persona draws upon a strong affinity that he exhibits for advaita ("non-dualism"), especially that of Śaṅkara, and that his personal history of intense devotional and ecstatic/yogic spiritual practices was likely important in the formative stages of this persona. I further suggest that the history of his geographic locale, in which there are strong themes of sacred kingship and ecstatic/advaitic/poetic/devotional sainthood, may have contributed to the production and reception of his persona. On top of this, I note that the influence of a number of modern avatar figures, especially Ramakrishna, Vivekananda, and Aurobindo, is patent in his avatar teachings, and I compare and contrast him with a number of other significant modern figures. Based upon all of this, I consider the question of whether Sathya Sai Baba ought to be regarded as a "traditionalist", both vis-à-vis modernity ("Neo-Hinduism", as defined especially by Paul Hacker) and "innovation". I conclude that, in contrast to most previous scholarly characterizations, he is certainly innovative, but that he ought not to be considered a "Neo-Hindu"-most appearances to the contrary being due to his borrowing or extrapolating ideas in a very traditional manner from typical Neo-Hindu thinkers (especially Vivekananda), as if these ideas, and those that framed them, were thoroughly traditional. Finally, I outline a couple of major themes in his avatar teachings: an ambivalent attitude to his role as an exemplar, which I note to accord with earlier and parallel avatar ideas; and strong docetic tendencies, which similarly, in contrast to some scholarly characterizations, find parallels in popular portrayals of other avatar figures.
64

Could this phrase be more constructional? : A Construction Grammar approach to the COULD X BE MORE Y phrase from the television show Friends

Nordlander, Linn January 2024 (has links)
This thesis investigates the COULD X BE MORE Y phrase (CXBMY), well-known from the television show Friends, to argue for its qualification as a construction. By analyzing the phrase’s formal and functional features, as well as its frequency in the COCA corpus, this thesis compares the findings to the definition of constructions by Goldberg (2006, p. 5). The results prove the hypothesis that CXBMY is a construction since the form-function interrelation conveys its meaning; the form of a yes-no question and emphasis on the main auxiliary is understood based on its function as a rhetorical question and potential parody of the Friends character Chandler, and vice versa. The linguistic information of CXBMY – syntactic, semantic, pragmatic and information packaging – all contribute to describe the meaning of CXBMY, while simultaneously needing one another to create a complete understanding of CXBMY. Consequently, CXBMY has a non-predictability that requires us to store it in a mental constructicon. While CXBMY shows links to other known constructions, such as the SUBJECT AUXILIARY INVERSION CONSTRUCTION and INFORMATION PACKAGING CONSTRUCTION, its specific interrelation between form and function distinguishes CXBMY from other known constructions. Thus, this thesis reaches the conclusion that CXBMY is a construction. Additionally, since the inferential pragmatic function, intonation and information structure of CXBMY is crucial to understand its meaning, this thesis highlights the prominence of these linguistic aspects within Construction Grammar, which have so far been sparsely researched (Leino, 2013; Gras & Elvira-García, 2021; Finkbeiner, 2019).
65

Degradação de atrazina por processo foto-Fenton monitorado por injeção seqüencial e cromatografia a líquido de alta eficiência / Atrazine degradation by photo-Fenton process monitored by sequential injection chromatography and high performance liquid

Rios, Magda Dias Gonçalves 06 October 2006 (has links)
Processos de fotodegradação de compostos orgânicos tóxicos têm sido bastante estudados. Este trabalho trata da aplicação do processo foto-Fenton para a degradação de atrazina em água (composto modelo). O efeito das concentrações dos seguintes compostos foi avaliado: peróxido de hidrogênio (2 a 6 mmol L-1) e ferrioxalato de potássio (0,2 a 1 mmol L-1). Os experimentos foram realizados em um reator com lâmpada UV - 8W (254nm). O processo de fotodegradação foi monitorado por medidas de espectrofotometria de absorção molecular automatizada por injeção seqüencial (SIA) para determinação de peróxido de hidrogênio e por cromatografia a líquido de alta eficiência (CLAE) para determinação de atrazina e metabólitos. Os experimentos demonstram que o processo de foto-Fenton é viável para o tratamento de atrazina em água. / Photo-degradation processes of toxic organic compounds have been widely studied. This work describes the application of the photo-Fenton process for degradation of atrazine in water. Atrazine was used as a model compound. The effects of the concentration of the following substances were evaluated: hydrogen peroxide (1 to 6 mmol L-1) and potassium ferrioxalate (0.2 to 1 mmol L-1). The experiments were accomplished in a reactor with an 8W UV lamp at 254 nm. The photo-degradation was monitored by molecular absorption spectrophotometry automated by sequential injection analysis (SIA) for determination of hydrogen peroxide and by high performance liquid chromatography (HPLC) for determínation of atrazine and its metabolites. Experimental results demonstrated that the photo-Fenton process is feasíble for the treatment of atrazine.
66

Degradação de atrazina por processo foto-Fenton monitorado por injeção seqüencial e cromatografia a líquido de alta eficiência / Atrazine degradation by photo-Fenton process monitored by sequential injection chromatography and high performance liquid

Magda Dias Gonçalves Rios 06 October 2006 (has links)
Processos de fotodegradação de compostos orgânicos tóxicos têm sido bastante estudados. Este trabalho trata da aplicação do processo foto-Fenton para a degradação de atrazina em água (composto modelo). O efeito das concentrações dos seguintes compostos foi avaliado: peróxido de hidrogênio (2 a 6 mmol L-1) e ferrioxalato de potássio (0,2 a 1 mmol L-1). Os experimentos foram realizados em um reator com lâmpada UV - 8W (254nm). O processo de fotodegradação foi monitorado por medidas de espectrofotometria de absorção molecular automatizada por injeção seqüencial (SIA) para determinação de peróxido de hidrogênio e por cromatografia a líquido de alta eficiência (CLAE) para determinação de atrazina e metabólitos. Os experimentos demonstram que o processo de foto-Fenton é viável para o tratamento de atrazina em água. / Photo-degradation processes of toxic organic compounds have been widely studied. This work describes the application of the photo-Fenton process for degradation of atrazine in water. Atrazine was used as a model compound. The effects of the concentration of the following substances were evaluated: hydrogen peroxide (1 to 6 mmol L-1) and potassium ferrioxalate (0.2 to 1 mmol L-1). The experiments were accomplished in a reactor with an 8W UV lamp at 254 nm. The photo-degradation was monitored by molecular absorption spectrophotometry automated by sequential injection analysis (SIA) for determination of hydrogen peroxide and by high performance liquid chromatography (HPLC) for determínation of atrazine and its metabolites. Experimental results demonstrated that the photo-Fenton process is feasíble for the treatment of atrazine.
67

Disponibilidade e acessibilidade do Sistema de Avaliação Institucional (SAI) do Centro Paula Souza (CEETEPS): o entendimento dos gestores / Avaliability and accessibility of Institutional Assessment System (IAS) of Paula Souza Center: the indertanding of manapers

Luz, Rita Aparecida Nunes de Souza da 09 December 2015 (has links)
Submitted by Nadir Basilio (nadirsb@uninove.br) on 2016-05-05T20:59:32Z No. of bitstreams: 1 Rita Aparecida Nunes De Souza Da Luz.pdf: 2536340 bytes, checksum: a4c8a0c1c624034e517ac499ef7c03e6 (MD5) / Made available in DSpace on 2016-05-05T20:59:32Z (GMT). No. of bitstreams: 1 Rita Aparecida Nunes De Souza Da Luz.pdf: 2536340 bytes, checksum: a4c8a0c1c624034e517ac499ef7c03e6 (MD5) Previous issue date: 2015-12-09 / This study aimed to analyze the Institutional Assessment System (IAS) of the Paula Souza Center (CEETEPS) from the perspective of their availability and accessibility. For this, it was based on methodological foundations of qualitative research presenting itself as a single case study. The time frame for data collection and analysis was the period 2008 to 2015, being the subject of this research the managers of the respective IAS. Data from this study were collected in the case of the environment itself studied through non-participant observation and structured interview. He told, too, with the technique of focal group, formed by the managers of the IES, whose data were analyzed according to the content analysis technique proposed by Bardin (2011) having also document analysis in permissive triangulation depth study. Triangulation of data collected identified that the understanding of managers, as the availability and accessibility of the IAS do not converge with the aspects present in indicating literature in this way that although the availability and accessibility are present in the reports on the evaluation system, There is also the need for effective understanding with respect to the theoretical bases and their transformation into practical actions. Possible centrality is part thereof on the IAS. The conclusion gives the need to formulate guidelines to consider the availability and accessibility in the IAS. The discussion on this topic and its inclusion as an aspect evaluation ways are presented as improvements in their system. / Este estudio tuvo como objetivo analizar el Sistema de Evaluación Institucional (SEI) del Centro Paula Souza (CEETEPS) desde la perspectiva de su disponibilidad y accesibilidad. Para ello, se basó en fundamentos metodológicos de la investigación cualitativa se presenta como un estudio de caso único. El marco de tiempo para la recolección y análisis de datos fue el período desde 2008 hasta 2015, con los directivos de la respectiva SEI. Los datos de este estudio se recogieron en el caso del propio entorno estudiado mediante la observación no participante y la entrevista estructurada. Él dijo, también, con la técnica de grupo focal, formado por los directores de SEI, cuyos datos fueron analizados según la técnica de análisis de contenido propuesto por Bardin (2011), que tiene también el documento de análisis en el estudio a fondo de triangulación permisiva. La triangulación de los datos recogidos identificó que la comprensión de los administradores, como la disponibilidad y accesibilidad de el SEI no convergen con los aspectos presentes en la literatura indicando de esta manera que a pesar de la disponibilidad y accesibilidad están presentes en los informes sobre el sistema de evaluación, También existe la necesidad de un entendimiento eficaz con respecto a las bases teóricas y su transformación en acciones prácticas. Dio a conocer también posible centralidad en la parte de la misma, en el Sistema de Evaluación Institucional , que llegó a la conclusión de que, dada la necesidad de formular directrices para considerar la disponibilidad y accesibilidad en el SEI , la discusión sobre este tema y su inclusión como evaluativa aspecto se presentan como aspectos de mejoras en su sistema. / Este trabalho teve por objetivo analisar o Sistema de Avaliação Institucional (SAI) do Centro Paula Souza (CEETEPS) sob a ótica de sua disponibilidade e acessibilidade. Para tanto, fundamentou-se em bases metodológicas de pesquisa qualitativa apresentando-se como estudo de caso único. O recorte temporal de coleta e análise de dados foi o período de 2008 a 2015, sendo os sujeitos desta pesquisa os gestores do SAI. Os dados foram coletados no próprio ambiente do caso estudado por meio da observação não participante e de entrevista estruturada. Contou, ainda, com a técnica do grupo focal, formado pelos gestores do SAI, cujos dados coletados foram analisados segundo a técnica de análise do conteúdo preconizada por Bardin (2011) tendo, também, amparo na análise documental. A triangulação dos dados coletados permitiu identificar que o entendimento dos gestores, quanto à disponibilidade e acessibilidade do SAI, não convergem com os aspectos presentes na literatura. Indicam, desta maneira, que embora a disponibilidade e a acessibilidade estejam presentes nos relatos sobre o sistema de avaliação, existe, ainda, a necessidade de efetivo entendimento no que tange às bases teóricas e suas transformações em ações práticas. Revelou, também, a possível centralidade, por parte dos mesmos, sobre o SAI. Estes resultados permitiram concluir que, dada a necessidade de formulação de Diretrizes que se voltem mais acentuadamente para a disponibilidade e a acessibilidade no SAI, a discussão sobre este tema é oportuna, e sua inclusão como aspecto avaliativo se apresentam como parte integrante das melhorias deste sistema, no seu todo.
68

AI - ett framtida verktyg för terrorism och organiserad brottslighet? : En framtidsstudie

Gustav, Lindström, Ludvig, Lerbom January 2021 (has links)
This paper explores the future of Artificial Intelligence (AI) and how it can be used by organised crime orterrorist organisations. It exploresthe fundamentals of AI, its history and how its use is affecting the waypolice operate. The paper shows how the development rate of AI is increasing and predicts how it willcontinue to evolve based on different parameters. A study of different types of AI shows the different usesthese systems have, and their potential misuse in the near future. By using the six pillars approach, aprediction concerning AI and the development of Artificial General Intelligence (AGI) is explored, andits ramifications to our society. The results show that in a world with AGI, AI-enabled crime as we knowit would cease to exist, but up until that point, the use of AI in crime will continue to impact our daily livesand security / Denna uppsats undersöker framtiden för AI och hur den kan användas av organiserad brottslighet ellerterroristorganisationer. Den utforskar grunderna för AI, dess historia och hur dess användning påverkarpolisens verksamhet. Uppsatsen visar hur utvecklingshastigheten för AI ökar och förutsäger hur denkommer att fortsätta utvecklas baserat på olika parametrar. En studie av olika typer av AI visar de olikaanvändningsområdena dessa system har och deras potentiella missbruk inom en snar framtid. Genom attanvända metoden sex pelare undersöks en förutsägelse om AI och utvecklingen av Artificiell Generellintelligens (AGI) och dess konsekvenser för vårt samhälle. Resultaten visar att i en värld med AGIkommer AI-aktiverad brottslighet som vi vet att den skulle upphöra att existera, men fram till den tidenkommer användningen av AI i brottslighet att fortsätta att påverka vårt dagliga liv och säkerhet.

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