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Schuster, Stefanie [Verfasser]. « Deciphering the effect of mutant STUB1 on the heat shock response in SCAR16 patient-derived cells / Stefanie Schuster ». Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/1216501882/34.
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Santos, Nathly Xavier dos. « Avaliação do efeito neurotóxico da proteína prion em linhagens celulares e sua modulação pelas co-chaperonas CHIP/Stub1 e STI1 ». reponame:Repositório Institucional da UFPR, 2017. http://hdl.handle.net/1884/47465.
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Orientadora : Profª Drª Adriana Frohlich MercadanteDissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências Biológicas, Programa de Pós-Graduação em Ciencias Biológicas (Microbiologia, Parasitologia e Patologia Básica). Defesa: Curitiba, 10/03/2017
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Resumo: A proteína prion celular (PrPC) e uma glicoproteina extracelular, ancorada na membrana plasmática por uma molécula de glicofosfatidilinositol (GPI). A conversão de PrPC em uma isoforma patologica (PrPSc), a partir de modificações estruturais, e responsável pelo desenvolvimento das encefalopatias espongiformes transmissíveis (TSEs) ou doenças periódicas. Vários trabalhos indicam que formas citosólicas de PrP podem ser formadas durante erros na sua biossintese. Os príons citosólicos (CytPrP) são gerados por meio de duas vias: ERAD (ER-associated Degradation) e ineficiência do peptídeo sinal. Alguns estudos demonstram que estas formas de príons citosólicos exercem função neurotoxica, contribuindo para a manifestação das doenças periódicas. Trabalhos anteriores do nosso grupo, foram capazes de identificar uma interação entre PrPC e CHIP/Stub1. CHIP/Stub1 e uma proteína citoplasmática o qual funciona como um co-chaperona molecular e apresenta atividade ubiquitina E3- ligase, participando do controle de qualidade das proteínas desde o dobramento ate a fase de degradação. Ainda, CHIP/Stub1 e homologa a proteína STI1/Hop, uma cochaperona e um ligante bem estabelecido de PrPC. O objetivo desse trabalho foi avaliar em diferentes linhagens celulares se o efeito neurotoxico de PrP citosólico, ja descrito para algumas células, era capaz de ser modulado através dessas co-chaperonas. Em nossos resultados mostramos por diferentes ensaios de viabilidade celular, tais como MTT, vermelho neutro, que CytPrP reduziu de 30-50% a viabilidade celular de três linhagens neuronais testadas: N2a, SH-SY5Y e CF10. Esse mesmo efeito nao foi observado para linhagem renal HEK293T. A expressão das co-chaperonas CHIP e STI-1 foi capaz de reverter a toxicidade do CytPrP em todas linhagens neuronais. Nossos resultados ainda mostraram que mutantes de CHIP e STI-1 com domínios deletados também foram capazes de reverter o efeito neurotoxico causado pela CytPrP. Ensaios utilizando o inibidor MG132 e hidroxicloroquina sugerem que essa reversao do efeito neurotoxico de CytPrP por CHIP e STI-1 parece não ser dependente da via de degradação por proteossomo, nem por lisossoma. Assim, um mecanismo através do qual as co-chaperonas exercem seu efeito de proteção da neuroxicidade ainda esta sendo investigado. Os dados obtidos nesse trabalho poderão contribuir para elucidar os possíveis mecanismos da neurotoxicidade de prions, permitindo um auxilio futuro no desenvolvimento de alvos terapêuticos relacionadas a doenças prionicas. Palavras-chave: PrP citosólico. Neurotoxicidade. CHIP/Stub1. STI1. Prion.
Abstract: The cellular prion protein (PrPC) is an extracellular glycoprotein, anchored to the plasma membrane by a glycophosphatidylinositol (GPI) molecule. The conversion of PrPC to a pathological isoform (PrPSc), through structural modifications, is responsible for the development of transmissible spongiform encephalopathies (TSEs) or prion diseases. Several data indicate that cytosolic forms of PrP can be formed during errors in its biosynthesis. Cytosolic prions (CytPrP) are generated by two pathways: ERAD (ER-associated Degradation) and signal peptide inefficiency. Some studies have shown that these forms of cytosolic prions exert neurotoxic function, contributing to the manifestation of prion diseases. Previous work by our group was able to identify an interaction between PrPC and CHIP/Stub1. CHIP/Stub1 is a cytoplasmic protein, identified as a co- chaperone with E3 ligase activity, participating in the quality control of proteins, from folding to the degradation phase. Still, CHIP/Stub1 is homologous to STI1 (stress - inducible protein 1 ), a co-chaperone and a well-established PrPC bind protein. The objective of this work was to evaluate in different cell lines whether the neurotoxic effect of cytosolic PrP, already described for some cells, was able to be modulated through these co-chaperones. In our results we showed by different cell viability assays, such as MTT, neutral red, that CytPrP reduced from 30% to 50% the cell viability of three tested neuronal lines: N2a, SH-SY5Y and CF10. This same effect was not observed for HEK293T renal lineage. Our results also show that CHIP and STI-1 mutants with deleted domains were also capable of reversing the neurotoxic effect caused by CytPrP in all neuronal lines. Assays using the proteasome inhibitor MG132 and Hydroxychloroquine suggest that this reversal of the neurotoxic effect does not appear to be dependent of the proteosome or lysosomal degradation pathways. Thus, a mechanism through which co-chaperones exert their protective effect of CytPrP neuroxicity is still being investigated. The data obtained in this work may contribute to elucidate possible mechanisms of neurotoxicity of prions, allowing future aid in the development of therapeutic targets related to prion diseases. Keywords: cytosolic PrP. Neurotoxicity. CHIP/Stub1. STI1. Prion
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Nascimento, Heli Henriques Alcantara. « SISTEMA GERADOR DE STUBS ». Universidade de São Paulo, 1995. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-18042018-101439/.
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Esta dissertação apresenta o projeto e implementação de um sistema gerador de sfubs, para utilização no ambiente computacional do Laboratório de Sistemas Digitais do ICMSC/USP, em plataformas DOS. O gerador de sfubs é uma ferramenta de auxílio ao desenvolvimento de aplicações distribuídas e tem como função criar automaticamente os procedimentos sfubs, a partir da definição dos serviços que serão executados remotamente. Esse software de apoio libera os programadores da implementação de rotinas que envolvam os protocolos básicos de comunicação. Os procedimentos sfubs são responsáveis pela comunicação entre os processos clientes e os serviços oferecidos. Com esses procedimentos, os processos cliente e servidor podem ser compilados e executados separadamente, em máquinas diferentes. Dentre as vantagens do sistema gerador de sfubs, a mais importante, e que está bem caracterizada neste trabalho, é o ganho de produtividade nos projetos de aplicações distribuídas, tornando extremamente atrativa sua adoção nesses projetos. O sistema proposto está implementado na linguagem \"C\" e pode ser utilizado facilmente para a geração de aplicações distribuídas envolvendo equipamentos compatíveis com a linha IBM-PC, executando DOS versão 3 ou superior.This dissertation presents the project and implementation of a stub generator system, to be used in the Digital Systems Laboratory at ICMSC/USP, running on DOS platforms. The stub generator is an auxiliary tool for the development of distributed applications and has the responsability of creating the stub procedures automatically, based on the definitíon of the services that will be executed remotely. The auxiliary software releases the programmers from the routine implementation tasks that involve the basic communication protocol. The stub procedures are responsible for the communication between the clients processes and the available services. With these procedures, the client and the server can be both compiled and executed separately, on diferent machines. The most attractive advantage in adopting the stub generator described in this work is the gain of productivity observed in distributed applications designs. The proposed system is implemented in the \"C\" language and can be easily used for the generation of distributed applications involving IBM-PC compatible platforms, executing the DOS version 3 or higher.
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Trapp, Peter. « Performance improvements using dynamic performance stubs ». Thesis, De Montfort University, 2011. http://hdl.handle.net/2086/5335.
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This thesis proposes a new methodology to extend the software performance engineering process. Common performance measurement and tuning principles mainly target to improve the software function itself. Hereby, the application source code is studied and improved independently of the overall system performance behavior. Moreover, the optimization of the software function has to be done without an estimation of the expected optimization gain. This often leads to an under- or overoptimization, and hence, does not utilize the system sufficiently. The proposed performance improvement methodology and framework, called dynamic performance stubs, improves the before mentioned insufficiencies by evaluating the overall system performance improvement. This is achieved by simulating the performance behavior of the original software functionality depending on an adjustable optimization level prior to the real optimization. So, it enables the software performance analyst to determine the systems’ overall performance behavior considering possible outcomes of different improvement approaches. Moreover, by using the dynamic performance stubs methodology, a cost-benefit analysis of different optimizations regarding the performance behavior can be done. The approach of the dynamic performance stubs is to replace the software bottleneck by a stub. This stub combines the simulation of the software functionality with the possibility to adjust the performance behavior depending on one or more different performance aspects of the replaced software function. A general methodology for using dynamic performance stubs as well as several methodologies for simulating different performance aspects is discussed. Finally, several case studies to show the application and usability of the dynamic performance stubs approach are presented.
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Kommareddy, Christopher. « Detecting DDoS attacks in stub domains ». College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3324.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.Thesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Sadasivan, Sridhar. « Mathematical Modeling of Behavior of T-Stub Connections ». University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092837126.
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Guerrero, Enriquez Rubén Dario. « Etude des filtres miniatures LTCC High K en bandes L&S ». Thesis, Brest, 2016. http://www.theses.fr/2016BRES0036/document.
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Dans les systèmes actuels de communication, qu’ils soient terrestre ou spatial, qu’ils soient mobile ou fixe, il y a un réel intérêt à développer des front-ends radiofréquences et hyperfréquences miniatures et performants. Ceci s’applique en particulier aux dispositifs de filtrage où l’encombrement et les facteurs de qualité sont clairement antagonistes. Pour les bandes de fréquences basses aux alentours du GHz, les longueurs d’onde restent encore importantes, rendant difficiles les efforts de miniaturisation. D’autre part il faut aussi s’assurer que ces filtres viendront s’interconnecter aisément avec les autres composants du système, notamment les actifs.Pour toutes ces raisons, le développement de structures de filtres multicouches utilisant des substrats à haute permittivité (εr = 68) selon une approche LTCC apparait comme une alternative intéressante. Elle peut en effet conduire à une réduction significative de l'empreinte (footprint) sans pour autant trop nuire aux performances électriques.Dans le cadre de ce travail, deux structures de filtres multicouches ont été développées pour répondre à des spécifications proposées en bandes L et S, par un équipementier du spatial. Ces filtres ont pour caractéristiques principales un haut niveau de rejection et des faibles pertes dans la bande passante. Pour atteindre les spécifications, un filtre SIW empilé verticalement et un filtre à stubs en court-circuit en configuration triplaque ont été étudiés. Le filtre SIW se distingue par un facteur de qualité élevé, ce qui entraîne des faibles pertes d’insertion et une bonne platitude. La solution à stub permet quant à elle de réduire l’encombrement mais au prix d’un impact sur les performances électriques. Dans les deux cas on tire parti de la souplesse offerte par la technologie LTCC, puisqu’elle offre finalement un degré de liberté supplémentaire, par rapport à une approche planaire classique. Si dans le cas SIW, c’est surtout l’architecture topologique qui a été étudiée finement pour pouvoir agencer et coupler douze cavités, dans le cas du filtre à stub une synthèse mettant à profit tous les degrés de liberté offerts a été spécifiquement développée.Compte tenu de la complexité des filtres, notamment à cause de l’ordre élevé et de la mise en oeuvre de murs « électriques » à partir d’arrangements de via spécifiques, une attention particulière doit être apportée lors des phases de simulation et d’optimisation. De plus la très forte permittivité du substrat ne permet pas d’utiliser de ligne 50 Ohms. Enfin les transitions constituent un point dur de l’exercice surtout dans le cas SIW.Cette thèse co-financée par le CNES (Centre National d'Etudes Spatiales) et Thales Alenia Space, était accompagnée par un projet R&T financé par le CNES. Le fondeur allemand Via Electronic avait en charge la fabrication des filtresIn current communication systems, whether terrestrial or spatial, whether fixed or mobile, there is a real interest in developing high performance miniature RF front-ends. This is applied in particular to filter devices, in which the size and the quality factors are clearly in conflict. For low frequency bands around the GHz, the wavelengths remain significant, making it difficult the miniaturization efforts. On the other hand, we must also ensure that these filters will be easily interconnected with other other system components, including active devices.For all these reasons, the development of multilayer filter structures using high permittivity substrates (Er = 68) in an LTCC approach is consolidated as an interesting alternative. It may lead to a significant footprint reduction without decreasing the electrical performances.As part of this work, two multilayer filter structures have been developed to meet the given specifications in L and S bands, given by a space manufacturer. These filters have as main features a high rejection level and low losses in the passband. To meet the specifications, a vertically stacked SIW filter and a short-circuited stubs filter in a stripline configuration were studied. The SIW filter is characterized by a high quality factor, which results in low insertion loss and good flatness. The stubs filter allows in contrast to reduce the footprint but at the price of impacting the electrical performance. In both cases we take advantage of the flexibility offered by the LTCC technology as it finally provides an additional freedom degree compared to a conventional planar approach. For the SIW filter, the topological architecture was studied and designed in detail, to be able to arrange and synthetize couplings between twelve cavities. In a similar way, for the stub filter a synthesis that takes profit of all the offered freedom degrees was developed.Given the filters complexity, especially due to the high order and the implementation of “electrical walls" based on specific vias patterns, a close attention must be paid during the simulation and optimization phase. In addition, the high permittivity substrate does not allow to conceive 50-Ohms lines. Finally, access transitions constitute a challenging task, especially for the SIW case.This thesis was co-funded by CNES (Centre National d'Etudes Spatiales) and Thales Alenia Space, and was accompanied by an R&T project funded by CNES. The German foundry Via Electronic was responsible for the filters fabrication
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HEITOR, ANTONYONY CARLOS JORDAO. « STUDY OF A MODIFIED STUB-GIRDER FLOOR SYSTEM ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33365@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Este estudo tem por objetivo avaliar o comportamento estrutural de um sistema de vigamento de piso tipo stub-girder, modificado para melhor aproveitamento dos perfis em sua fabricação. O estudo é baseado em formulações não lineares a partir do método dos elementos finitos (MEF), com uso do software ANSYS. Através do software FTOOL foi criado um modelo simplificado para a análise estrutural e o cálculo das resistências nominais foi feito com base na norma canadense CAN-S16-10 da Canadian Standards Association. Além disso, foram avaliadas as cargas de máximas e de serviço do sistema, bem como os deslocamentos associados a estes carregamentos. Com base nos resultados obtidos, foram feitas recomendações de projeto do sistema e foram avaliadas as condições de economia de material e possibilidade de utilização na prática de construção de edificações de andares múltiplos. Com vistas à fase de construção, é feita a discussão sobre a possibilidade de obtenção de um método construtivo industrializado, já que o sistema de fabricação é caracterizado pela rapidez de produção e montagem, que são facilitadas pelo fato deste sistema permitir a reutilização de pequenos comprimentos de perfis que sobram no processo normal de fabricação.
This study s purpose was to evaluate the structural behavior of a stub-girder floor-system, which was modified to better utilize the steel profiles in its manufacturing process. The study is based on nonlinear analysis through the use of the finit element method (FEM), employing the software ANSYS. For the structural analysis, a simplified model was created through the use of the software FTOOL and the nominal resistances was obtained based on the canadian CAN-S16-10 Standard, by the Canadian Standards Association. Furthermore, the working and tensile loads were evaluated, as were the displacements associated to them. Based on the results, designs recommendations were made and the conditions of economy of material, as well the possibility of the system s practical use in multi-storey buildings were discussed. With regards to the construction phase, a discussion was made on the possibility of obtaining an industrialized construction method, since the manufacturing process is characterized by the fast production and assembly, which are facilitade by the fact that this system allows the reuse of small lenghts of remaining profiles from the normal manufacturing process.
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Åkerström, Christian. « Utveckling av Verktyg för generering av Stubb- och Mockobjekt för C ». Thesis, Linköping University, Department of Computer and Information Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12111.
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Testdriven utveckling samt användning av enhetstestning är ett växande område. Vid användning av dessa tekniker är det önskvärt att kunna använda stubb- och mockobjekt för att ersätta en DOC(Dependent on Component).
I dagsläget finns det ett verktyg hos Enea som genererar stubbar för C++-källkod. Examensarbetet består av att vidareutveckla detta verktyg i flera avseenden. Stöd för C-kod adderas till verktyget. För C-kod adderas även möjligheten att generera stubb- och mockobjekt. Testning av verktyget görs mot ett befintligt kundprojekt hos Enea med goda resultat.
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Madros, Mohd Shahreen Zainooreen Bin. « The structural behaviour of composite stub-girder floor systems ». Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253823.
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Barts, Robert Michael. « The Stub Loaded Helix : A Reduced Size Helical Antenna ». Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/29728.
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This dissertation details the development of a novel reduced size axial mode helical antenna called the Stub Loaded Helix (SLH). The SLH achieves a significant reduction in helix size, both diameter and length, compared to the conventional axial mode helix antenna with only small compromises in performance. The SLH achieves this entirely through the use of a unique geometry. The performance characteristics of the SLH are explored through the use of computer simulations using NEC (Numerical Electromagnetics Code) to study the effects of design parameter variations. Based on those simulations, design guides are developed. The numerical simulations are verified though measurements of experimental prototypes. The program of experimental prototypes included the development of an appropriate impedance matching network for the SLH, which is also detailed.Ph. D.
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Ré, Reginaldo. « Uma contribuição para a minimização do número de stubs no teste de integração de programas orientados a aspectos ». Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-28042010-114822/.
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A programação orientada a aspectos é uma abordagem que utiliza conceitos da separação de interesses para modularizar o software de maneira mais adequada. Com o surgimento dessa abordagem vieram também novos desafios, dentre eles o teste de programas orientados a aspectos. Duas estratégias de ordenação de classes e aspectos para apoiar o teste de integração orientado a aspectos são propostas nesta tese. As estratégias de ordenação tem o objetivo de diminuir o custo da atividade de teste por meio da diminuição do número de stubs implementados durante o teste de integração. As estratégias utilizam um modelo de dependências aspectuais e um modelo que descreve dependências entre classes e aspectos denominado AORD (Aspect and Oriented Relation Diagram) também propostos neste trabalho. Tanto o modelo de dependências aspectuais como o AORD foram elaborados a partir da sintaxe e semântica da linguagem AspectJ. Para apoiar as estratégias de ordenação, idealmente aplicadas durante a fase de projeto, um processo de mapeamento de modelos de projeto que usam as notações UML e MATA para o AORD é proposto neste trabalho. O processo de mapeamento é composto de regras que mostram como mapear dependências advindas da programação orientada a objetos e também da programação orientada a aspectos. Como uma forma de validação das estratégias de ordenação, do modelo de dependências aspectuais e do AORD, um estudo exploratório de caracterização com três sistemas implementados em AspectJ foi conduzido. Durante o estudo foram coletadas amostras de casos de implementação de stubs e drivers de teste. Os casos de implementação foram analisados e classificados. A partir dessa análise e classificação, um catálogo de stubs e drivers de teste é apresentadoAspect-oriented programming is an approach that uses principles of separation of concerns to improve the sofware modularization. Testing of aspect-oriented programs is a new challenge related to this approach. Two aspects and classes test order strategies to support integration testing of aspect-oriented programs are proposed in this thesis. The objective of these strategies is to reduce the cost of testing activities through the minimization of the number of implemented stubs during integration test. An aspectual dependency model and a diagram which describes dependencies among classes and aspects called AORD (Aspect and Object Relation Diagram) used by the ordering strategies are also proposed. The aspectual dependency model and the AORD were defined considering the syntax constructions and the semantics of AspectJ. As the proposed estrategies should be applied in design phase of software development, a process to map a desing model using UML and MATA notations into a AORD is proposed in order to support the ordering strategies. The mapping process is composed by rules that show how to map both aspect and object-oriented dependencies. A characterization exploratory study using three systems implemented with AspectJ was conducted to validate the ordering strategies, the aspectual dependency model and the AORD. Interesting samples of stubs implementations were collected during the study conduction. The stubs were analyzed and classified. Based on these analysis and classification a catalog of stubs and drivers is presented
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Teixeira, Mario Antonio Meireles. « Aplicações distribuídas em Windows 95 apoiadas por ferramenta de geração automática de stubs ». Universidade de São Paulo, 1997. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-01022001-161620/.
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Este trabalho apresenta uma ferramenta de apoio ao desenvolvimento de aplicações distribuídas, baseadas em RPCs, para o ambiente Windows 95. Discute, ainda, algumas aplicações construídas para validar o sistema, as quais seguem o paradigma cliente-servidor. É feita uma revisão bibliográfica dos assuntos mais relevantes relacionados ao tema e apresentados os detalhes de implementação da ferramenta. Esta foi implementada com técnicas de orientação a objetos, sendo composta por um Gerador Automático de Stubs e uma Biblioteca RPC, além de possibilitar a utilização de um Serviço de Binding. As aplicações construídas procuram explorar as potencialidades da ferramenta, sendo fornecidas também orientações gerais para o desenvolvimento de aplicações distribuídas no ambiente Windows 95.This work presents a tool to support the development of RPC-based distributed applications in the Windows 95 environment. It also discusses some applications built to validate the system, which follow the client-server model. A theoretical review of the most relevant topics related to the field is done and the tools implementation details are presented. This tool was implemented with object-oriented techniques and comprises an automatic Stub Generator and an RPC Library, together with a Binding Service. The distributed applications that were built try to explore the tools full potential. General guidelines regarding the development of distributed applications for the Windows 95 environment are also provided.
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Collet, Dominik. « Die Welt in der Stube : Begegnungen mit Außereuropa in Kunstkammern der Frühen Neuzeit / ». Göttingen : Vandenhoeck & ; Ruprecht, 2007. http://catalogue.bnf.fr/ark:/12148/cb41179725p.
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Igor, Barrientos Germán Rosauro. « Desempeño sísmico de edificio de acero con conexiones apernadas doble T ». Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/142084.
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Ingeniero CivilEl presente trabajo tiene como objetivo determinar el desempeño sísmico de marcos de momento con conexión viga-columna doble t soldadas. Para ello, se implementa la metodología presentada en FEMA p695, la cual permite cuantificar el desempeño sísmico de nuevos sistemas estructurales. Para implementar la metodología, se requiere determinar de forma explícita las curvas de carga vs deformación de todos los elementos estructurales que componen el sistema sismo-resistente. Para las vigas y columnas se emplean las curvas presentadas en FEMA-356, mientras que para determinar la curva de la conexión viga-columna, se utiliza el modelo de rigidez desarrollado por Swanson, 2000. Los resultados indican que un marco de momento con conexiones doble-t soldadas solo puede considerarse como marcos especiales (SMF) si el tamaño de sus vigas es de perfiles IN70 o inferior. Para marcos que requieran vigas de mayor dimensión, se deben considerar como marcos ordinarios (OMF), con el factor de reducción menor correspondiente. Este resultado ratifica lo expuesto en FEMA-350, donde se precalifica la conexión t-stub plegada para ser usada como SMF solo hasta perfiles tamaño W24.
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Liu, Bo. « Design a Bandpass Filter for GSM 900 : Half Wavelength Open Circuit Stubs Filter Design ». Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-15503.
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Smallidge, Jeffrey M. « Behavior of bolted beam-to-column T-stub connections under cyclic loading ». Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19534.
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Swanson, James A. « Characterization of the strength, stiffness, and ductility behavior of T-stub connections ». Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/24166.
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Biasi, Luciano Bathaglini. « Geração automatizada de drivers e stubs de teste para JUnit a partir de especificações U2TP ». Pontifícia Universidade Católica do Rio Grande do Sul, 2006. http://hdl.handle.net/10923/1691.
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Previous issue date: 2006Testing has become essential to assure the quality of software products. Within the process test, unit test is performed on the smallest funcional part of the software and it aims at discovering defects in these units. JUnit is a unit test tool, which assists developers in the automation of tests and verification of results. However, much time, cost and effort are still spent to codify drivers and stubs, which most of the time jeopardizes its use. Another problem found in the unit test is the need of cases test specification in a higher level language, which is independent of any specific programming language. The Test Profile of UML 2. 0 (U2TP) solves this problem, because it allows to represent and document all artifacts used in the test process. This work aims at the fully automated generation of test drivers and stubs for JUnit from U2TP test specifications. A case study has shown that the developed algorithms correctly generated all test code, considering all elements explored in this work. The main goal of the case study was the validation of the correctness of the generated code, as well as the quantitative analysis of time consumed and number of code lines generated.
Atualmente a área de teste de software tem se tornado fundamental para garantia da qualidade dos produtos desenvolvidos. Dentro do processo de teste, o teste unitário é realizado na menor parte funcional de um software e visa descobrir defeitos nestas unidades. JUnit é uma ferramenta de apoio ao teste unitário, a qual auxilia desenvolvedores na automação dos testes e verificação dos resultados. Porém, muito tempo, custo e esforço ainda são gastos para codificar os drivers e os stubs de teste necessários a esta ferramenta, o que muitas vezes inviabiliza o seu uso. Outro problema encontrado no processo de teste unitário é a necessidade de especificação dos casos de teste em uma linguagem de mais alto nível, que seja independente de linguagem de programação. O Perfil de Teste da UML 2. 0 (U2TP) resolve este problema, pois permite representar e documentar todos artefatos utilizados no processo de teste. Esta dissertação de mestrado tem por objetivo a geração totalmente automatizada de drivers e stubs de teste para ferramenta JUnit a partir de especificações de testes modeladas com a U2TP. Um estudo de caso mostrou que os algoritmos propostos geraram corretamente todo código de teste para todos elementos explorados neste trabalho. O estudo de caso teve como principais objetivos a validação correta do código gerado, bem como uma análise quantitativa em relação ao tempo envolvido e número de linhas de código geradas.
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Снятовський, Андрій Іванович, et А. І. Sniatkovs’kyi. « Проект автотранспортного підприємства на 70 вантажних автомобілів для технічного обслуговування та ремонту поворотної цапфи з дослідженням комплексного діагностування підшипників і опор кочення ». Thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2017. http://elartu.tntu.edu.ua/handle/123456789/18937.
Texte intégralRésumé :
Роботу виконано на кафедрі технології машинобудування Тернопільського національного технічного університету імені Івана Пулюя Міністерства освіти і науки України.
Захист відбудеться 23 лютого 2017 р. о 9 00 годині на засіданні екзаменаційної комісії No1 у Тернопільському національному технічному університеті імені Івана Пулюя за адресою: 46001, м. Тернопіль, вул. Лукіяновича, 4, навчальний корпус № 11, ауд. 11.В дипломній роботі виконано розроблення проекту автотранспортного підприємства для технічного обслуговування та ремонту поворотної цапфи з дослідженням комплексного діагностування підшипників і опор кочення.
In the diploma thesis, a motor transportation company project for maintenance and repair a stub axle is developed with the study of bearings and rolling-contact bearings complex diagnostics.
21
Showalter, Sheldon Lee. « Investigation of Ultimate Strength of Composite Open-Web Joist-Girders ». Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/40930.
Texte intégralRésumé :
The goal of this research was to study several methods of generating composite action using open-web joist-girders, designed and manufactured by Nucor Corporation. In addition to comparing the relative performance of these systems, it was intended to determine whether the current accepted design procedure for composite joists could be extended to joist-girders.Master of Science
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Schrader, Craig A. « Prequalification and Design of Rolled Bolted T-stub Connections in Moment Resisting Frames ». University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1291060563.
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Hantouche, Elie. « Behavior Of Thick Flange Built-up T-stub Connections For Moment Resisting Frames ». University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313687182.
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Hess, W. Gregory (Willard). « Cyclic behavior of shape memory alloy tendons and steel bolted t-stubs in beam-column connections ». Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20740.
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Weerasinghe, Manoja Dilrukshi. « The structural behaviour of a composite stub-girder incorporating an asymmetric slim floor beam ». Thesis, University of Cambridge, 2000. https://www.repository.cam.ac.uk/handle/1810/283924.
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Biasi, Luciano Bathaglini. « Gera??o automatizada de drivers e stubs de teste para JUnit a partir de especifica??es U2TP ». Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2006. http://tede2.pucrs.br/tede2/handle/tede/5043.
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Previous issue date: 2006-01-11Atualmente a ?rea de teste de software tem se tornado fundamental para garantia da qualidade dos produtos desenvolvidos. Dentro do processo de teste, o teste unit?rio ? realizado na menor parte funcional de um software e visa descobrir defeitos nestas unidades. JUnit ? uma ferramenta de apoio ao teste unit?rio, a qual auxilia desenvolvedores na automa??o dos testes e verifica??o dos resultados. Por?m, muito tempo, custo e esfor?o ainda s?o gastos para codificar os drivers e os stubs de teste necess?rios a esta ferramenta, o que muitas vezes inviabiliza o seu uso. Outro problema encontrado no processo de teste unit?rio ? a necessidade de especifica??o dos casos de teste em uma linguagem de mais alto n?vel, que seja independente de linguagem de programa??o. O Perfil de Teste da UML 2.0 (U2TP) resolve este problema, pois permite representar e documentar todos artefatos utilizados no processo de teste. Esta disserta??o de mestrado tem por objetivo a gera??o totalmente automatizada de drivers e stubs de teste para ferramenta JUnit a partir de especifica??es de testes modeladas com a U2TP. Um estudo de caso mostrou que os algoritmos propostos geraram corretamente todo c?digo de teste para todos elementos explorados neste trabalho. O estudo de caso teve como principais objetivos a valida??o correta do c?digo gerado, bem como uma an?lise quantitativa em rela??o ao tempo envolvido e n?mero de linhas de c?digo geradas.
27
Chen, Bo-Hua, et 陳柏樺. « Hsc70/Stub1 drives individual turnover of oxidatively-stressed peroxisomes ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/sdtzt5.
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Galatolo, Daniele. « An integrated, next-generation approach to identify new genes and new pathways in hereditary ataxias ». Doctoral thesis, 2020. http://hdl.handle.net/2158/1188709.
Texte intégralRésumé :
The Hereditary ataxias (HAs) are a group of heterogenous neurological disorders associated with multiple genetic etiologies and encompassing a wide spectrum of phenotypes, where ataxia is the prominent feature. HAs are characterized by degeneration of Purkinje cell and/or spinocerebellar connections, often associated with defects in additional brain structures, and all patterns of inheritance may occur. Similar to other fields of medical genetics, Next Generation Sequencing (NGS) has entered the HA scenario widening our genetic and clinical knowledge of this condition, but routine NGS applications still miss genetic diagnosis in about two third of patients.
In this doctoral study, we applied multi-gene panels to define the molecular basis in 259 patients with a clinical diagnosis of HA and negative to tests for pathological expansion in SCA1, 2, 3, 6, 7, 8, 12, 17 and FXN. We found a positive molecular diagnosis in 25% of patients, whereas a similar number of patients had an uncertain diagnosis due to the presence of either variants of uncertain significance or lack of biological samples to determine segregation among family members. Hence despite a higher positive diagnostic rate compared to similar studies described in literature, a half of patients lacked any indication of the genetic cause of their disease. Using exome sequencing as a second-tier approach in some families, refractory to multi-gene panel analysis, did not significantly improved our diagnostic yield. On the other hand, NGS analysis in our cohort indicated that familial cases were more easily diagnosed rather than sporadic cases, and also that combining massive sequencing with detailed clinical information and family studies increases the likelihood to reach a molecular diagnosis. Among positive patients, we could expand clinical and allelic information in a subgroup of genes offering original description of new mutations and corroborating genetic findings with functional investigations that took advantage of different in vitro or in vivo platforms. In particular, through functional studies in SPG7 knock-down models of Drosophila melanogaster, we remarked that SPG7, whose mutations cause spastic paraplegia type 7, has a critical role in neurons more than in skeletal muscle. The high frequency of p.Ala510Val mutation in SPG7 observed in our cohort as well in similar studies performed elsewhere moved us to develop a humanized knock-in fruit fly model harboring that specific mutation and prepare preliminary characterizations. Similar studies in fruit fly were performed silencing AFG3L2, the gene causing SPAX5 in a child in association with an unusual, relatively milder phenotype. Furthermore, combination of skin fibroblasts and Saccharomyces cerevisiae as models was employed in the genetic characterization of new mutations in a novel recessive HARS-related phenotype whereas primary human cells, yeast and Danio rerio models were used to functionally characterize new HA-related mutations in COQ4. Finally, we could expand the clinical presentation of rare causes of HAs describing new dominant mutations in STUB1 and biallelic variants in RFN216, COQ8A, and ATP13A2.
Altogether, studies performed during this doctoral work further underlined the usefulness of NGS in HAs and highlighted how NGS technologies rely on the integrated use of family and clinical studies and different in vitro/in vivo platforms to substantiate molecular findings. The latter platform will be also a tool for future investigations to dissect pathogenesis and to improve therapies.
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Liu, Fu-Chieh, et 劉富杰. « Shorted-Stub Microstrip Bandpass Filters ». Thesis, 2007. http://ndltd.ncl.edu.tw/handle/43433680642250373719.
Texte intégralRésumé :
碩士國立臺灣大學
電信工程學研究所
95
In this thesis, the stepped-impedance resonators are used to replace the traditional quarter-wavelength shorted stub resonators in implementing the filters composed of coupled resonators. By varying the connecting line position between two resonators, one can effectively change the coupling so that the shorted-stub bandpass filters with various bandwidths may be realized.To suppress the harmonic spurious response, associated with the proposed filters ,the low-pass filters are incorporated in the filter design. Besides,the optimal distributed structures are used to realize the wideband bandpass filters. The limit of the bandwidth and the practical consideration are also discussed in the thesis.
30
Tambá, Bracia Veríssimo. « Comportamento experimental de T-Stubs sob condições cíclicas ». Master's thesis, 2020. http://hdl.handle.net/10316/93859.
Texte intégralRésumé :
Dissertação de Mestrado Integrado em Engenharia Civil apresentada à Faculdade de Ciências e TecnologiaO estudo de dispositivos de ligação, com o objetivo de assegurar a continuidade e transmissão de esforços numa estrutura, é um assunto amplamente desenvolvido por vários autores, sendo o método das componentes uma referência na análise e dimensionamento de uma gama alargada de configurações de juntas, encontrando-se mesmo codificado no Eurocódigo 3 – Projeto de estruturas de aço, Parte 1-8: Projeto de ligações. Ainda assim, este método foi calibrado apenas para juntas viga-pilar sob condições monotónicas de carregamento. O caráter cíclico de ações como o sismo, introduz uma camada de complexidade adicional a análise do comportamento das juntas, saindo fora do âmbito do método das componentes. Vários autores têm apresentado modelos analíticos capazes de simular o comportamento dissipativo das juntas metálicas aparafusadas em condições cíclicas de carregamento.Esta dissertação tem por objetivo a caraterização do comportamento de uma componente de extrema relevância para o comportamento dissipativo de uma ligação metálica viga-pilar: o T-Stub, através da sua modelação analítica e cujos resultados são confrontados com resultados de ensaios experimentais realizados.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
The study of connection devices, with the objective of ensuring the continuity and transmission of efforts in an all structure is a subject widely developed by several authors, the component method being a reference in the analysis and design of a wide range of joint configurations, it is even featured in Eurocode 3 - Design of steel structures, Part 1-8: design of structural connections. Nonetheless, this method was calibrated only for beam-column joints under monotonic loading conditions. The cyclical nature of these actions such as an earthquake, introduces a layer of additional complexity to the analysis of the behaviour of the joints, leaving outside the scope of the component method. Several authors have published analytical models capable of simulating the dissipative behaviour of bolted metal joints under cyclic loading conditions.This dissertation aims to characterize the behaviour of a component of extreme relevance for the dissipative behaviour of a beam-column metallic connection: the T-Stub, through its analytical modelling and whose results are compared with the results of experimental performed tests...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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Lin, Ting Yi, et 林庭毅. « Dual-Band Stub-Tapped Coupled-Line Couplers ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/16417053098606579416.
Texte intégralRésumé :
碩士長庚大學
電子工程學系
99
The purpose of this thesis is to develop the circuit structures and synthesis methods of the dual-band stub-tapped coupled-line couplers. In modern communication systems, microstrip couplers are useful because of they provide output signals with desired power split ratios and with 90 or 180 phase difference. Coupled-line couplers are favored and are often adopted in communication systems for their planar, simplicity, and ease of manufacture, which enhances their practicality. Since the conventional coupled-line couplers require their electrical lengths corresponding specific wavelengths, they only can be used for single band applications. There is an increasing demand for dual-band wireless communication systems that enable user access to various services. For this reason, how to enable single coupled-line coupler operated in dual bands is a popular research topic recently. Accordingly, this work proposes the novel circuit structures of stub-tapped coupled lines instead of using the conventional /4 coupled lines for dual-band operation. The T-shaped coupled lines have excellent dual-band performance for realization of couplers. Moreover, the dual-band couplers with stepped-impedance-stub coupled lines can have design flexibility because of their increased non-uniform impedances. The synthesis method is developed and found that it has several degrees of freedom which can be exploited to realize the arbitrary frequency ratio, miniaturize circuit size and replace impractical impedances with more realizable ones. In addition to the formulation and simulation, this work also fabricates several dual-band couplers with T-shaped coupled lines and stepped-impedance-stub coupled lines to demonstrate the capability of the proposed circuit structures. The measured results validate the superior performances are achieved.
32
Chen, Kuan-Han, et 陳冠涵. « Multiband Multiplexers by Using Multipath Stub-Loaded Resonators ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/02819347049737475516.
Texte intégralRésumé :
碩士國立中央大學
電機工程學系
105
In this thesis, the quad-channel diplexer, quad-band bandpass filter and octa-channel quadplexer are presented. These three circuits are using distributed coupling technique to achieve low loading effect and can obtain many channels without complicated matching network. The multipath stub loaded resonators is designed to have two resonant path, and the resonant frequencies can be easily controlled by tuning length for each resonant path in the multipath stub loaded resonators. The octa-channel quadplexer is composed of two set of multipath stub loaded stepped impedance resonators(SIR) and two set of multipath stub loaded uniform impedance resonators (UIR)with one long distribute input feeding line and four output feeding line. UIR structures and un-matching Q-factor at harmonic frequency were used to suppress harmonic, through which widestopband was achieved. And meanwhile UIR structures has characteristic of reduce the size of circuit. In short, the filters have advantages of compact size, high passband selectivity and high design freedom. As a result, the proposed octa-channel quadplexer occupies an exceedingly small circuit size, i.e., 0.34λg by 0.19λg, while still having good isolation better than 32 dB for each channel.
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Jamaluddin, N., Dennis Lam et J. Ye. « Finite Element Analysis of Elliptical Stub CFT Columns ». 2009. http://hdl.handle.net/10454/5582.
Texte intégral
34
Chiou, Wei-Chien, et 邱維乾. « Millimeter-wave Low Noise Amplifier Using Coplanar Series Stub ». Thesis, 1998. http://ndltd.ncl.edu.tw/handle/12888507116863806549.
Texte intégralRésumé :
碩士國立交通大學
電信工程研究所
86
In this thesis, we use CPW series open stubs as matching elements to design the millimeter-wave coplanar low noise amplifier. At the same time, we develop an effective matching skill that can design the broad- band multi-stage low noise amplifier by using coplanar series open stub as the element of the interstage matching network.The measurement results show that the excellent performance (high gain and low noise figure) of the hybrid MIC millimeter-wave low noise amplifier using coplanar series open stub is comparable with that of the MMIC millimeter-wave low noise amplifier.
35
Lin, Hung-Hsun, et 林宏勳. « Design of Microwave Filters Using Multi-stub Matching Technique ». Thesis, 2007. http://ndltd.ncl.edu.tw/handle/20758253141651918315.
Texte intégralRésumé :
碩士國立中興大學
電機工程學系所
95
Three kinds of design methods for lowpass filters and highpass filters are presented in the thesis. Three kinds of microwave filters are the A-type, B-type and C-type separately. The A-type filter is only suitable for the odd orders. The B-type filter is only suitable for the even orders. The C-type filter is suitable for the odd orders and even orders. Due to the limitation of PCB board fabrication. This thesis concentrates on matching by changing multi-stub impedances in the research . This work demonstrates three kinds of design formula in filters design and further discuss the impedance match of the multi-stub impedance and the admittance J inverters. The microstrip line obtain a new length value when the multi-stub impedances are matched at the same value. Therefore, a novel filter can be designed by adjusting the multi-stub impedance value. Afterward the work further discusses the variation of the multi-stub impedance. The simulation results show that the insertion loss and the return loss have obvious improvement. During the increase of impedance value, the attenuation performances of the filter become sharply. Practically, the designed lowpass and highpass filters are made by LTCC (low-temperature co-fired ceramics) process. At last, the thesis would demonstrate that the simulation results and the measurement results are identical.
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Huang, Sheng-Hua, et 黃聖驊. « Enhanced Signal and Power Integrity Using Open-Stub Structure ». Thesis, 2014. http://ndltd.ncl.edu.tw/handle/41411001225421126615.
Texte intégralRésumé :
碩士國立中山大學
電機工程學系研究所
102
With the advance of IC manufacture process, operating speed of the circuit systems gets higher, so does the demand for data communication. This phenomenon will induce the problem of signal integrity (SI) and power integrity (PI). Therefore, the purpose of this thesis is using open-stub structure to enhance the effective of signal and power integrity. The enhanced passive equalizer is using the frequency-dependent property of open stubs, so that makes the high-frequency part get a larger inductive to increase the equalizer performance. Compared the conventional passive equalizer with the proposed structure, a good performance has been demonstrated. In addition, by using plating bars to design the open-stub, it promote transmission quality and do not increase extra space. The ultra-wideban hybrid EBG structure, is using the stop band which caused by the opeb-stub to suppress certain frequency’s noise and increase the stop bandwidth. This structure not only has advantage of the hybrid EBG structure, but also has effect of ultra-wideband suppress. Moreover, we alse proposed the ground trace structure to solve the problem of Signal Integrity, and improve the signal quality of single-ended transmission line.
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Chang, Fu-Yuan, et 張富淵. « A Study on Coplanar Waveguide Bandpass Filter Using Open-Circuited Stubs ». Thesis, 2000. http://ndltd.ncl.edu.tw/handle/85879093308959543950.
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LEE, I.-SHU, et 李一書. « A STUDY ON COPLANAR WAVEGUIDE LOWPASS FILTER USING OPEN CIRCUIT STUBS ». Thesis, 1997. http://ndltd.ncl.edu.tw/handle/00531836347184649275.
Texte intégralRésumé :
碩士國立海洋大學
電機工程學系
85
IN THE DESIGN OF LOWPASS FILTER, THE CUTOFF FREQUENCY, THE INSERTION AND RETURN LOSSES IN THE PASSBAND, AND THE ATTENUATION SLOPS IN THE STOPBAND ARE IMPORTANT PARAMETERS TO BE CONSIDERED. MOREOVER, THEPERFORMANCES OF FILTERS CAN BE IMPROVED BY USING THE PLANAR STRUCTURES. IN THIS THESIS, THE CONDUCTOR-BACKED COPLANAR WAVEGUIDE STRUCTURESARE USED TO DESIGN THE LOEPASS FILTERUSING OPEN CIRCUIT STUBS. IN THIS THESIS, THE THEORY OF THE DESIGN OF LOWPASS FILTER IS ANALYZED FIRSTLY. NEXT,THE COPLANAR WAVEGUIDE LOWPASS FILTER WITH CROSS- AND T- IUNCTIONDISCONTINUITIES ARE DESIGNED AND REALIZED, RESPECTIVELY. MOREOVER, THE EFFECTOF COPLANAR WAVEGUIDE CROSS- AND T-JUNCTION DISCONTINUOUS ARE STUDIED AND COMPENSATEDPROPERLY. FINALLY, THE CHARACTERISTICS OF THE FILTERS ARE MEASURED AND IMPROVED BY THE SUGGESTED METHOD.
39
Jian, Zhang-Liang, et 簡彰良. « An investigation on one-section branch line coupler with open stubs ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/988wu8.
Texte intégralRésumé :
碩士國立勤益科技大學
電子工程系
106
We propose two type of one-section branch line coupler with open-ended stub designs. The first type has two symmetry planes in its structure. The circuit analysis bases on these symmetries could simplify the analysis procedure. Applying the corresponding four sub-circuits, we have the scattering parameters of the circuit. By given the characteristic impedances or the electrical lengths of two transmission line sections, we obtain a highly free design route for any given electrical length and output power ratio. The prototypes are designed, simulated, fabricated, and measured to verify the correctness of the design. Two electrical lengths, 750 and 450 are selected as the examples. The final layouts show 29% and 22% size reduction comparing with the conventional one. In addition, the output power ratio at output and coupling ports are 1:4 and 1:2, respectively. The second type circuit uses two kind of pi type equivalent circuits, C-TL-C and C-L-C. They are applied at two different transmission line sections. Furthermore, the shunted capacitance is converted into open-ended stub to have the same electrical characteristics but easy to fabricate. Also, two prototypes are designed, fabricated, and measured for the validity checking. They have the electrical lengths, 600 and 900, with output power ratios 5:1 and 3:1, respectively. The simulated and experimental results show good agreement with the frequency of interest. The proposed two type of one-section branch line coupler designs are all good in size reduction, freely function changing, and well suited for various RF/microwave circuits.
40
Asumani, Oscar. « Evaluation of pipe stub flange behaviour during hydrostatic pressure testing ». Thesis, 2008. http://hdl.handle.net/10539/4833.
Texte intégralRésumé :
ABSTRACT
An evaluation of glass reinforced plastic pipe stub-flange behaviour during hydrostatic
pressure testing is presented. Similar flanges made according to different
manufacturing methods were analysed. Linear static analysis using MSC Patran /
Nastran was performed to predict the critically loaded regions subjected to high stress
concentrations. These regions were used for experimental strain gauge locations.
Hydrostatic testing designed according to BS 5480 and ASTM F 37 was performed on
assembled flange joints to initiate both leakage and ultimate material failure.
Experimental strain results were compared to finite element numerical results at the
selected locations. Fibre dominated failure characterised by cracks extending through
the stub and matrix dominated failure characterised by interlaminar debonding were
noticed. The need for further work analyzing GRP flanges subject to mechanical load
and taking into account induced residual thermal stress effects is suggested.
41
Sung, Lung-Kuei, et 宋隆貴. « The Design Of Microwave Filter Using The Triple-Section Stub ». Thesis, 2006. http://ndltd.ncl.edu.tw/handle/te88e7.
Texte intégralRésumé :
碩士國立臺灣科技大學
電子工程系
94
Abstract The development of modern communication system has been flourishing. However, the channels seem to be inadequate. It is an inevitable trend for us using the bandwidth of microwave to increase the available channels. Meanwhile, it is absolute that the crowd of channels will cause the interference among them. Therefore, the filter developments are significantly important. While microwave frequency is developing, the traditional capacities and inductance are insufficient. The developments and implications of microwave components are followed. Based on the above thoughts, the research aims to discuss how to use transmission line to design microwave discrete time filters. First of all, the current developments of transmission line filters are introduced. A new model of discrete filters will be designed based on the researcher’s three-section transmission line theories. Finally, a discrete time filter will be implementation which follows the procedure of the research.
42
Wei, Yen Hsiu, et 魏延修. « Compact Dual-Band Rat Race with Stepped-Impedance-Stub Lines ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/23028836518298851662.
Texte intégralRésumé :
碩士長庚大學
電子工程學系
98
Abstract The purpose of this thesis is to develop the circuit structures and synthesis methods of miniaturized dual-band rat-race couplers. In modern communication systems, microstrip couplers are useful because of they can provide output signals with equal or unequal power ratios and with 90 or 180 phase differences. The rat-race couplers are popular circuits often used in communication systems. Since they require structures with uniform impedances and specific wavelengths involved, they only can be used for single band applications. For this reason, how to enable single coupler operated in dual bands is a popular research topic recently. In this thesis, we propose the stepped-impedance-stub line to replace the traditional /4 and 3/4 lines for dual-band rat-race design. By taking the advantage of non-uniform impedance distribution, the stepped-impedance-stub line can have an equivalent 90 electrical length in dual bands. The proposed stepped-impedance-stub line can have dual-band performance and is smaller than the conventional T-shaped line because of its increased non-uniform impedances. The synthesis method is developed and found that it has two degrees of freedom which can be exploited to miniaturize circuit size and/or replace impractical impedances with more realizable ones. The advantage of wide range of realizable frequency ratio of dual bands is also observed. Moreover, the novel dual-band -90° stepped-impedance-stub coupled lines are developed to replace the conventional 3/4 lines of rat-race for further size reduction. This thesis develops several novel dual-band rat-race couplers with stepped-impedance-stub lines. In addition to the formulation and simulation, we will also fabricate and measure practical circuits to demonstrate the capability of the proposed circuit structures.
43
Chung, Chin-Wen, et 鍾錦文. « Design of Multi-band Antenna with a Parasitic Shorting Stub ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/09609506477297488533.
Texte intégral
44
Ren, Q.-X., L.-H. Han, Dennis Lam et C. Hou. « Experiments on special-shaped CFST stub columns under axial compression ». 2014. http://hdl.handle.net/10454/5929.
Texte intégralRésumé :
This paper is an attempt to study the behavior of axially loaded concrete filled steel tubular (CFST) stub columns with special-shaped cross-sections, i.e. triangular, fan-shaped, D-shaped, 1/4 circular and semi-circular. A total of forty-four specimens including CFST stub columns and reference hollow steel tubular stub columns were tested. The effects of the changing steel tube wall thickness and the infill of concrete on the behavior of the composite columns were investigated. The results showed that the tested special-shaped CFST stub columns behaved in a ductile manner, and the composite columns showed an outward local buckling model near the middle section. Generally, the failure modes of these five kinds of special-shaped specimens were similar to those of the square CFST stub columns. Finally, simplified model for predicting the cross-sectional strength of the special-shaped CFST sections was discussed and proposed.
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Wang, Pei-wen, et 王姵文. « Using z-Transform Technique and Parallel Stubs To Design Narrow Band-pass Filter ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/nd4mkt.
Texte intégralRésumé :
碩士國立臺灣科技大學
電子工程系
99
In this thesis, we propose an approach to design and implement networks with capability of being microwave filters. Using z-domain technique and parallel two-section stubs to design a narrow bandpass filter. This method present a z-domain transform technique to design an arbitrarily pre-defined filter is implemented by using equal-length transmission lines. Parallel open stubs placed on both sides of the serial transmission line are used to induce a passband that forms a narrow bandpass filter. The filters are implemented with serial transmission lines, parallel open one-section stub, parallel short one-section stub, and parallel two-section stubs. The filter responses of defined by design can be implemented with the configuration of transmission lines for microwave application. The simulated results show that the passband is narrow, and the filter can suppress the higher order harmonics. Eventually, experimental results are presented to illustrate the validity of the two design method.
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YU, Chih Ching, et 游智清. « The stuby of the three or four nuclear metal clusters containing bridged ligands ». Thesis, 1995. http://ndltd.ncl.edu.tw/handle/63583794810823945634.
Texte intégralRésumé :
碩士中原大學
化學學系
83
This thesis discusses the metal cluster containing hydride or alkoxy bridged ligands and is divided into three parts : Part One : Protonation of electron-deficient tetrameris metal clusters [H4M4-(CO)12][NPr4]4(M=W(1), Mo(2) containing four- center,two- eiectron μ-H was invesigated.Protonation of compound (1) with NH4+ followed by treatment with dppm , Provides [(CO)6W2(μ-H) (μ-dppm)2] [NPr4](6a) . Protonation of compound (1)and(2) was found to proceed stepwise,and complexes with one or two coppingμ3-H , [(CO)12M4(μ3-H)(μ3-OMe)3][NPr4 ]4 (M=W(5a) , Mo(5b)) and [(CO)12M4(μ3-H)2(μ3-OMe)2][NPr4]4 (M=W(5a') , Mo(5b')) were isolated from the reactions . Compound (5a) : Monoclinic,P21/c, Z=4, V=8016(20)A3, a=23.08(3) b=13.95(3) c=24.141(10)A , β=91.42(10), R=0.044, Rw=0.044 Compound (6a) : Monoclinic,P21/n,Z=4, V=7095(3)A3, a=14.150(5) b=26.398(6) c=19.474(5)A , β=102.77(2) , R=0.057 , Rw=0.059 Part Two : Tungsten complexes with a three-center , two- electron (3c- 2e) metal-hydrogen-metal bond , [ (CO)8 W2 (μ-H) (μ-dppm) ] [NEt4] reacts with M'PPh3+ ( M'=Au , Ag , Cu ) to afford mixed metal complexes (CO)8W2(μ3-H)(μ-dppe)(μ-M'PPh3) (M'= Au(11a ),Ag(11b),Cu(11c)) with contain a four-center,two- eiectron,M3 (μ-H) bond.The μ3-H ligand is coplanar with the two tungsten and M' atoms . The complexe [(CO)8 W2 (μ-H) (μ- dppm)] [NEt4] reacts similarly with CuPPh3+ to yield the product (CO)8 W2 (μ3-H)(μ-dppe)(μ-CuPPh3)(15). In contrast, its reaction with AuPPh3 gives a mixture of (CO)8W2(μ3-H)(μ- dppe)(μ-AuPPh3)and (CO)W2(H)(μ-dppe)(AuPPh3). The structure of the compound(15) was chacterized by single crystal X-ray diffraction. Compound (15) : Triclinic , P1 , Z=2, V=2555(1)A3, a=12.617(2) b=13.069(5) c=16.643(3)A, α=97.20(2) , β=102.77(2) , γ=16.643(3) , R=0.026 Rw=0.037 Part Three : The trimeric metal clusters [(CO)9 M3(μ-OEt)(μ3-OEt)2] [ NMe4 ] M=W(3) , Mo(4)) containing bridging ethoxy ligands react with three equivalents of AuPPh3+ to yeild the neutral
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Yung-ShengWang et 王詠昇. « Mechanical metamaterial based on the two-dimensional phononic crystal plates with periodic stubs ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/78a64m.
Texte intégralRésumé :
碩士國立成功大學
機械工程學系
105
Chiral and star-shaped honeycomb structures can be considered as periodic phononic structures. These structures can be design to have an effective negative Poisson’s ratio. The materials which have negative Poisson’s ratio are known as auxetic materials. The elastic wave propagations within the periodic honeycomb structures are investigated by using the finite element method and Bloch’s theorem. In the present thesis, we calculate first the effective Poisson’s ratio and Young’s modulus of tetrachiral structures with quadratic ligament, anti-tetrachiral structures and star-shaped honeycomb structures by finite element static analysis. By changing the geometric parameters, we can design the honeycomb structures which can have effective negative Poisson’s ratio. The dispersion analysis of two-dimensional phononic crystal plates with periodic stubs are analyzed. By changing different effective material parameters, we investigate the evolution of the complete band-gap for different negative Poisson’s ratio. We find that the first band-gap of tetrachiral structures with quadratic ligament is the lowest. By changing the geometric parameters of the phononic crystal, material and shape of the stubs, respectively, the influence on the center frequency and bandwidth of the first band-gap is also compared. We find that different height of stubs, plate thickness and lattice constants will have different effect on band-gap. And the larger the density of stub’s material is, the lower center frequency and narrower bandwidth we will get. In the application, we use these structures to design the phononic crystals with defects and locally resonant. In the case of phononic crystal with defects, we analyze its defect modes and quality factor, and find that the higher the resonance frequency is, the better quality factor we will get. In locally resonant phononic crystal, the rubber layer is added as soft material. By changing its filling ratio or height, the complete band-gap will have different operating frequency ranges. The larger the filling ratio is, the higher the center frequency of the first band-gap we will find. But the band-gap frequency does not decrease as the height of rubber layer increases. These features can be used to design different kinds of multi-channel filters. We also demonstrate the feasibility of these designs by full wave simulations of COMSOL Multiphysics®.
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Tsai, Yu-Hao, et 蔡宇浩. « Design of Lowpass Unequal Power Dividers Using Aperiodic Stubs on a Microstrip Line ». Thesis, 2016. http://ndltd.ncl.edu.tw/handle/67rz47.
Texte intégralRésumé :
碩士國立臺灣海洋大學
通訊與導航工程學系
105
In this thesis, we use the aperiodic T-shaped structure to replace the low impedance line of the original Wilkinson unequal power dividers, and improve the problem of spurious band. We also minimize the circuit size of the modified Wilkinson unequal power dividers. Finally, compact designs capable of suppressing spurious bands are realized.
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Chun-TeChang et 張俊德. « Topological valley edge states of elastic waves in the plate with periodic stubs ». Thesis, 2018. http://ndltd.ncl.edu.tw/handle/dzg7k4.
Texte intégral
50
Chung, Ping-E., et 鍾秉邑. « Multi-Band Bandpass Filters by Using Asymmetric Uniform Stub Loaded Resonators ». Thesis, 2013. http://ndltd.ncl.edu.tw/handle/s7y78p.
Texte intégralRésumé :
碩士國立高雄應用科技大學
光電與通訊工程研究所
101
This thesis presents the design of the multi-band bandpass filter (BPF) using the stub-loaded resonators structure. The possible resonant modes can be found by deriving the input admittance of the resonators. The resonant figure contains the information about the possible resonator modes to be chosen. The passbands of the filters are supported by the modes. In the thesis, four different bandpass filters designed for various applications of interest are discussed. The proposed dual-band BPF is composed of a uniform impendence resonator (UIR) and a loaded stub connected to the UIR with different electronic lengths to form a stub loaded resonator (SLR). The SLR is used to design a compact dual-band bandpass filter (BPF). The resonant modes of the SLR form the passbands of the BPF. The center frequencies of the passbands of the BPF are determined by the length ratios. The BPF exhibits good passband performance with center frequencies of 2.44 and 3.55 GHz with low insertion losses of 2.5 and 2.8 dB, respectively. The transmission zeros are also obtained near the passband at 2.5 and 2.8 GHz. The BPF is compact due to the interdigital coupling design. The transmission zeros are created close to the first passband edge, which results in high selectivity. The measured results agree well with the simulated ones. The second BPF is a tri-band BPF, which is constructed by a pair of asymmetric uniform stub-loaded resonators (AUSLRs). The center frequencies of the BPF are obtained by properly controlling the location of the stub and length ratio of the AUSLR. The center frequencies of the resultant BPF are located at 1.4, 2.6, and 3.5 GHz with low insertion losses of 0.9, 1.75, and 2.7 dB, respectively. The transmission zeros are also obtained near the passband at 1.27, 2.04, 3.37, and 3.67 GHz. Moreover this AUSLR structures create transmission zeros close to each passband edge, resulting in high selectivity, good isolation, and compact size. The measured results agree well with the simulated ones. The third BPF is designed to have four passbands. The quad-band BPF is studied for the first time by using an asymmetric uniform stub-loaded resonator (AUSLR). The passbands of the proposed filter are designed for global system for mobile communications (GSM) and wireless local area network (WLAN) at 0.89, 1.92, 2.35, and 3.31 GHz. The passbands are centered at 0.9, 1.96, 2.4, and 3.35 GHz with low insertion losses of 0.37, 0.72, 0.99, and 1.06 dB, respectively. The transmission zeros are also obtained near the passband at 0.7, 1.4, 1.7, 2.1, 2.6, 2.7, and 3.6 GHz. The measurement results are in line with the simulation ones. As a result, the quad-band filter is proven to be compact, low-loss, and high selectivity. The last proposed filter is quint-band BPF. The BPF is studied for the first time by using asymmetric uniform stub-loaded resonators (AUSLRs). The passband of the proposed filter is designed for global system for GSM, Bluetooth, WiMAX, and WLAN applications and the center frequencies are located at 0.91, 1.92, 2.43, 3.48, and 4.4 GHz. The passbands are centered at 0.87, 1.99, 2.48, 3.52, and 4.42 GHz with insertion losses of 0.99, 1.2, 1.09, 1.48, and 2.15 dB, respectively. The transmission zeros are also obtained near the passband at 0.75, 1.06, 2.27, 2.78, 3.62, 4.29, and 4.77 GHz. The measurement results are in line with the simulation ones. As a result, the quint-band filter is proven to be compact, low-loss, and high selectivity. Keyword: bandpass filter, tri-band, quad-band, quint-band, asymmetric uniform stub-loaded resonator, transmission zero.