Дисертації з теми "Auxiliary time"

International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, Nevada
Chart recorders are needed both for producing a permanent record for post-mission analysis and for providing real-time information during a test. Immediate feedback is important when test conditions may require mid-course warnings or corrections. In the traditional galvanometer based chart recorder, the operator can look directly at the pens moving on the paper and quickly judge speed and amplitude. When using a thermal array recorder, there is a small delay between the time of printing and the time when the trace is visible. This is due to the construction of the thermal array itself. Individual printing elements are deposited on a ceramic substrate which eliminates all motion from the printing process and physically blocks the operator’s view of the printhead so that for a short time there are no visual clues as to the exact waveform position. At higher chart speed this gap only represents milliseconds of elapsed time, well below human reaction time, and therefore of no real importance. At trending speeds, however, the delay could be half a second or even more and could be a problem in some situations. The first solution offered by manufacturers of thermal array recorders was a row of LED’s that stretched across the recorder directly over the printheads and reflected printing activity in real-time and indicated the actual position of the individual waveform traces. This was found to be a satisfactory solution by most telemetrists who wanted to change to the new technology in order to take advantage of the thermal array recorder’s higher frequency response and flexible formats. While the LED array satisfies basic real-time response requirements, there are many other applications for auxiliary displays which include variable chart labeling and graphic display of waveforms.

Computer simulation of electromagnetic behaviour of a device is a common practice in modern engineering. Maxwell's equations are solved on a computer with help of numerical methods. Contemporary devices constantly grow in size and complexity. Therefore, new numerical methods should be highly efficient. Many industrial and research applications of numerical methods need to account for the frequency dependent materials. The Finite-Difference Time-Domain (FDTD) method is one of the most widely adopted algorithms for the numerical solution of Maxwell's equations. A major drawback of the FDTD method is the interdependence of the spatial and temporal discretisation steps, known as the Courant-Friedrichs-Lewy (CFL) stability criterion. Due to the CFL condition the simulation of a large object with delicate geometry will require a high spatio-temporal resolution everywhere in the FDTD grid. Application of subgridding increases the efficiency of the FDTD method. Subgridding decomposes the simulation domain into several subdomains with different spatio-temporal resolutions. The research project described in this dissertation uses the Huygens Subgridding (HSG) method. The frequency dependence is included with the Auxiliary Differential Equation (ADE) approach based on the one-pole Debye relaxation model. The main contributions of this work are (i) extension of the one-dimensional (1D) frequency-dependent HSG method to three dimensions (3D), (ii) implementation of the frequency-dependent HSG method, termed the dispersive HSG, in Fortran 90, (iii) implementation of the radio environment setting from the PGM-files, (iv) simulation of the electromagnetic wave propagating from the defibrillator through the human torso and (v) analysis of the computational requirements of the dispersive HSG program.

In this thesis, a sliding mode controller employing a new sliding surface for antilock brake system (ABS) is proposed, its stability is proven formally and its performance is compared with existing sliding mode controllers. The new sliding mode controller uses the integral-derivative surface, which includes error, its derivative and its integral, all at the same time. This and the already existing derivative surface, which includes error and its derivative only, are named zerothorder sliding surfaces. Their stability analysis is done using first-order auxiliary surfaces. Auxiliary surfaces equal the sliding surfaces when derivative of the error becomes zero. The first-order error surface, which includes only the error, and the integral surface, which includes error and its integral, were also designed for comparison. During design, tire brake force response is modelled as an uncertainty. Controllers are simulated on a road with an abrupt change in road coefficient of adhesion. Controller parameters used are optimized, which results in comparable stopping distances while braking on a constant coefficient of adhesion road. Effect of first order actuator dynamics with varying time constants and actuator absolute time delay were considered. Reaching and sliding properties of controllers were also investigated, using results on a constant coefficient of adhesion road. It is observed that zeroth-order sliding surfaces give smoother response for both derivative and integral-derivative cases. As the controllers employing error and derivative surfaces get unstable in the presence of actuator time delay, the integral-derivative surface, proposed in this study, stands as the best controller.

En France, les unités localisées pour l’inclusion scolaire (ULIS) au sein des collèges ont connu un fort développement depuis la loi du 11 février 2005. Ces dispositifs permettent à des élèves reconnus institutionnellement handicapés (ERIH) d’avoir une scolarité dans une classe ordinaire tout en bénéficiant d’un dispositif de soutien. Les élèves bénéficient d’un emploi du temps partagé qui les amène à fréquenter différents systèmes didactiques, que ce soit au sein de la classe ordinaire ou dans le cadre du regroupement spécialisé. Notre travail de recherche s’attache à observer des pratiques inclusives en mathématiques dans le cadre de ces dispositifs ULIS. Nous cherchons plus particulièrement à dégager quelles sont les conditions favorables pour que le regroupement spécialisé (système didactique auxiliaire - SDA) puisse jouer un rôle d’aide à l’étude vis-à-vis de la classe ordinaire (système didactique principal - SDP). Pour étudier la question des articulations entre différents systèmes didactiques nous nous plaçons dans un double cadre théorique. L’approche comparatiste en didactique, associée à des outils issus de la didactique de mathématiques, nous permet de comparer différents systèmes didactiques à partir de l’analyse des cadres temporels produits par ces systèmes. Ce travail, mené à partir de quatre études de cas réalisées dans quatre collèges différents, permet de mettre en évidence que si l’articulation entre la classe et le regroupement spécialisé est un objet pensé par une majorité des acteurs rencontrés, la fonction d’aide à l’étude du SDA vis-à-vis du SDP est possible lorsque certaines conditions sont réunies, mais elle n’est pas systématique
In France, localized units for inclusive education (ULIS) within the college have experienced a strong development since the law of February 11, 2005. These devices allow students recognized institutionally disabled to have a schooling in an ordinary class while benefiting from a support device. These students benefit from a shared schedule that leads them to attend various didactic systems, whether in the regular classroom or in the context of the specialized group. Our research work focuses on observing inclusive mathematical practices in these ULIS devices. In particular, we seek to find out what are the favorable conditions for the specialized grouping (auxiliary didactic system) to play a role in assisting the study with regard to the ordinary class (main didactic system). To study the question of articulations between different didactic systems we place ourselves in a double theoretical framework. The comparative approach in didactics combined with tools from mathematical didactics allows us to compare different didactic systems from the analysis of the time frames produced by these systems. This work, based on four case studies carried out in four different colleges, shows that if the articulation between the class and the specialized group is an object thought by a majority of the actors met, the assistance to the study of auxiliary didactic system vis-à-vis the main didactic system is possible when certain conditions are met, but it is not systematic

Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro Tecnologico
Made available in DSpace on 2016-01-08T21:42:13Z (GMT). No. of bitstreams: 1 108849.pdf: 2533552 bytes, checksum: 43aa439d393bafdd67216fa4c0cd57e4 (MD5) Previous issue date: 1997
Em uma sociedade onde os consumidores estão cada vez mais exigindo por qualidade nos produtos e nos serviços, e com os mercados globalizados, dinâmicos e altamente competitivos, há uma crescente preocupação nas empresas não só em manter, mas em incrementar seu desempenho no que diz respeito a qualidade e produtividade. Devido a estes fatos, as filosofias japonesas de manufatura e administração, especialmente a Filosofia Just-in-Time (JIT), têm-se mostrado tão atrativas. O JIT é baseado no conceito de eliminação total das perdas do sistema produtivo através da estratégia de redução dos estoques. O sistema kanban age como a base do JIT, sendo a sua função direcionar a matéria prima somente quando necessário e na quantidade certa. Apesar do sistema kanban ser uma técnica simples, com a sua aplicação em diferentes situações nas quais as condições de operação da filosofia JIT não estejam plenamente concretizadas, gerou-se a necessidade de conhecer mais sobre como o sistema kanban se comporta e como pode ser otimizado na planta fabril. Assim, para que se possa obter os beneficios da utilização do kanban, o ajuste e compreensão do funcionamento do sistema kanbans é essencial. Considerando os aspectos mencionados, tem-se como objetivo deste trabalho desenvolver uma metodologia para o ajuste dos parâmetros do sistema kanban que proporcione melhores condições de operação de acordo com as metas do JIT. Objetiva-se também analisar como os parâmetros do sistema kanban influenciam no comportamento do sistema produtivo, e quais as penalidades ao sistema kanban caso as condições de operação do JIT estejam abaixo do ideal.

Dissertação (mestrado) - Universidade Federal de Santa Catarina. Centro Tecnologico
Made available in DSpace on 2012-10-16T05:13:58Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-08T18:05:31Z : No. of bitstreams: 1 93250.pdf: 3382933 bytes, checksum: 0bc99eb6c1f2ee26b192039cdd2ffe45 (MD5)
O layout industrial é um elemento de grande importância para os sistemas de produção. Com um layout eficiente é possível racionalizar os esforços para a agregação de valor aos produtos, através da diminuição de atividades que não contribuem para esta adição de valor. Exemplos destas atividades são o transporte de produtos em processamento, o fluxo de produção em contra corrente e os estoques intermediários. No sistema de produção Just in Time, o layout industrial, além de reduzir o número de atividades que não agregam valor, deve também possibilitar a flexibilização dos meios de produção e a integração da manufatura, atributos que podem implicar em vantagem competitiva em relação a empresas concorrentes, pois dotam a fábrica de uma grande velocidade de resposta frente as exigências do mercado. O uso do computador para o projeto do layout industrial deve-se ao fato de que por meio deste é possível sistematizar o processo de projeto, permitindo que as tomadas de decisão sejam feitas de acordo com regras claras e bem definidas, além de ser possível contar com extensas bases de dados. O modelo computacional desenvolvido neste trabalho visa superar alguns pontos fracos apresentados por softwares já existentes que se dedicam ao projeto do layout industrial, além de inserir este projeto no contexto do sistema Just in Time.

Дисертація на одержання наукового ступеня кандидата технічних наук за фахом 05.02.08 – технологія машинобудування. Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертація присвячена вирішенню задачі підвищення ефективності технологічних операцій обробки металів різання за рахунок одержання, більшою мірою відповідних дійсним умовам реального виробництва, норм часу підготовки автоматичного режиму роботи технологічних операцій при врахуванні зміни працездатності основних робітників протягом робочого часу. Розроблено математичні моделі функціональних зв'язків між продуктивністю, надійністю технологічної операції й трудомісткістю, типовістю й алгоритмічною складністю її допоміжних процесів, які дозволяють сформувати групи технологічних операцій для багатоверстатного обслуговування з досить високим рівнем використання основного обладнання. Все це дало можливість розробити й проаналізувати імітаційні моделі ділянок існуючого основного й ремонтного виробництва, здійснити технологічні й організаційні зміни в ході оптимізації виробничих витрат.
The thesis for a technical sciences candidate’s degree in speciality 05.02.08. – engineering technology National technical university "Kharkov polytechnical institute", Kharkov, 2016. In represented dissertation the problem of the account and optimization of the expenditure of auxiliary time in connecting with handwork and of the machine-hand work of the person in system of the industrial module of machining by the shearing for conditions of small-batch and individual types of manufacture is solved. For achievement of delivered purposes the description and formalization of organization-technical and technological structure of workplaces of machining by cutting with the help of an fuzzy semantic macronetwork is made. The system of recognition of an existing situation and forecasting target industrial situation is developed. The technique of classification of technology factors in view of extents of their stability during realization of a technological process is created. The analysis of existing manufacture is executed, on the basis of the created simulatoin model of a repair section and optimization of a microstructure and parameters of a technological process by a way of organizational changes on a work station and by installation of rational sequence of execution of labour receptions.

Дисертація на одержання наукового ступеня кандидата технічних наук за фахом 05.02.08 – технологія машинобудування. Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертація присвячена вирішенню задачі підвищення ефективності технологічних операцій обробки металів різання за рахунок одержання, більшою мірою відповідних дійсним умовам реального виробництва, норм часу підготовки автоматичного режиму роботи технологічних операцій при врахуванні зміни працездатності основних робітників протягом робочого часу. Розроблено математичні моделі функціональних зв'язків між продуктивністю, надійністю технологічної операції й трудомісткістю, типовістю й алгоритмічною складністю її допоміжних процесів, які дозволяють сформувати групи технологічних операцій для багатоверстатного обслуговування з досить високим рівнем використання основного обладнання. Все це дало можливість розробити й проаналізувати імітаційні моделі ділянок існуючого основного й ремонтного виробництва, здійснити технологічні й організаційні зміни в ході оптимізації виробничих витрат.
The thesis for a technical sciences candidate’s degree in speciality 05.02.08. – engineering technology National technical university "Kharkov polytechnical institute", Kharkov, 2016. In represented dissertation the problem of the account and optimization of the expenditure of auxiliary time in connecting with handwork and of the machine-hand work of the person in system of the industrial module of machining by the shearing for conditions of small-batch and individual types of manufacture is solved. For achievement of delivered purposes the description and formalization of organization-technical and technological structure of workplaces of machining by cutting with the help of an fuzzy semantic macronetwork is made. The system of recognition of an existing situation and forecasting target industrial situation is developed. The technique of classification of technology factors in view of extents of their stability during realization of a technological process is created. The analysis of existing manufacture is executed, on the basis of the created simulatoin model of a repair section and optimization of a microstructure and parameters of a technological process by a way of organizational changes on a work station and by installation of rational sequence of execution of labour receptions.

The master's thesis consists of three parts: technological, design and research. In the technological part, the improvement of the technological process for the manufacture of basic parts in modern conditions using automated production is considered. In the design part, the development of a mechanized mounting and clamping device for a vertically milling operation and a control and measuring device for a control operation are carried out. In the research part, optimization of cutting conditions for milling a flat surface of the body with milling cutters of various diameters of domestic and foreign manufacturers is given. This part contains a comparison of the milling resistance, determination of the number of workpieces and a comparison of the cost of cutting tools of two manufacturers. The necessary set of design and technological documentation has been formed.
Магистерская диссертация состоит из трех частей: технологической, конструкторской и научно-исследовательской. В технологической части рассматривается совершенствование технологического процесса на изготовление корпусной детали в современных условиях с использованием автоматизированного производства. В конструкторской части производится разработка механизированного установочно-зажимного приспособления на вертикально-фрезерную операцию и контрольно-измерительного приспособления на контрольную операцию. В научно-исследовательской части приведена оптимизация режимов резания для фрезерования плоской поверхности корпуса фрезами различного диаметра отечественного и зарубежного производителей. Данная часть содержит сравнение стойкости фрез, определение количества обрабатываемых деталей и сравнение стоимости режущих инструментов двух производителей. Сформирован необходимый комплект конструкторской и технологической документации.

Les applications industrielles FSI se caractérisent par des géométries et des matériaux complexes. Afin de prédire avec précision leur comportement, des coûts de calcul élevés sont associés, à la fois en temps et en ressources informatiques. Pour améliorer la qualité de la prédiction sans pénaliser le temps de calcul, et pour réduire le temps de calcul sans impacter la précision disponible aujourd'hui, deux axes principaux sont explorés dans ce travail. Le premier est l'étude d'un algorithme asynchrone qui pourrait permettre l'utilisation de modèles structurels complexes. Le second consiste à étudier la méthode des tranches en combinant l'utilisation d'un modèle RANS et d'un modèle FEM non linéaire. D'une part, l'étude de l'asynchronicité dans le domaine FSI a révélé différents aspect d'intérêt qui doivent être approfondis avant que l'approche puisse être utilisée industriellement. Cependant, un premier traitement des points mentionnés ci-dessus a montré des signe d'amélioration qui pourraient conduire à un algorithme prometteur, qui se situe naturellement entre l'algorithme explicite et l'algorithme implicite. D'autre part, il a été montré que la méthode des tranches développée dans ce travail conduit à une réduction significative du temps de calcul sans dégradation de la précision
FSI industrial applications are often described by complex geometries and materials. In order to accurately predict their behavior, high computational costs are associated, both in time and in computational resources. To improve the quality of the prediction without penalizing the computational time, and to reduce the computational time without impacting the accuracy that is available today, two main axes are explored in this work. The first one is the study of an asynchronous algorithm that could allow the use of complex structural models. The second axis consists of the study of the strip method while combining the use of a RANS model and a non-linear FEM model. On the one hand, the study of asynchronicity in the FSI domain revealed different aspects of interest that must be addressed before the approach can be used industrially. However, a first treatment of the limitations found showed signs of an improvement that could lead to a promising algorithm, one that naturally lies between the implicit external algorithm and the implicit internal algorithm. On the other hand, it was shown that the strip method developed in this work achieves a significant reduction in calculation time while maintaining excellent accuracy

O tratamento de reabilitação motora compreende o emprego de um conjunto de técnicas terapêuticas que visam incitar a ocorrência da plasticidade cerebral, atividade fisiológica na qual o sistema nervoso central busca estabelecer novas ligações sinápticas para promover a recuperação da função neuromuscular. Observando-se as técnicas atualmente empregadas e fundamentando-se no fato da criança apresentar alta capacidade de sofrer plasticidade neural, decidiu-se desenvolver um sistema mecatrônico interativo como ferramenta de auxílio ao tratamento de reabilitação de crianças com deficiência motora nas pernas. O presente trabalho descreve a implementação deste sistema, composto por uma bicicleta instrumentada, integrada a um ambiente virtual de aparência lúdica, desenvolvidos com o objetivo de proporcionar a execução dos exercícios físicos de forma divertida e cativante, estimulando a ocorrência de uma plasticidade neural mais rápida e eficiente. Ao final do trabalho são relatadas algumas demonstrações práticas realizadas, onde foram avaliados os níveis de motivação das crianças, além de alguns depoimentos médicos a respeito das expectativas do projeto.
The rehabilitation treatment consists in a set of therapeutic techniques that try to stimulate cerebral plasticity. Cerebral plasticity is a physiologic phenomenon where the brain searches for new neural connections to supply the deficient function. lt is known that the young brain has a high cerebral plasticity capacity. Based on this, an interactive mechatronic system was developed to assist the rehabilitation treatment of children with motor disturbances in their legs. This system is composed of an instrumented bicycle and an entertaining virtual world generated by computer, developed to stimulate the child to accomplish the physical activities in a captivating and fun way and, consequently, increasing the cerebral plasticity performance. ln the end of this document some practical experiments were reported, showing the motivation of the children. Some medical opinions regarding the expectations of the project were also reported.

The present doctoral thesis concentrate efforts in the consolidation of the benefits introduced by the plug-in repetitive action in the performance of pulse-width modulated voltage source inverters. The work is focused in the application of these inverters in double conversion uninterruptible power systems to comply the most demanding requirements of the international standards. The use of the plug-in repetitive action, in this application, is suitable because the inverter demands the advantageous characteristics of cyclic disturbance rejection by it introduced. In this scenario, this thesis is divided in two parts. The first one comprise the proposition of algorithms to solve some disadvantageous characteristics of the repetitive actions, such as the reduced stability margin and the unsuitable performance under reference signals with variable frequency. The second one, by the other hand, comprise the questions related to the design of these repetitive action controllers. It is included the proposition of a methodology that link the design of these controllers with the output filter of a double conversion UPS. Finally, it is worth to emphasize that are presented simulation and experimental results, obtained on a 1kVA laboratory prototype, that validate the proposes carried out.
A presente tese de doutorado concentra esforços na consolidação dos benefícios introduzidos pela ação de controle repetitiva auxiliar no desempenho de inversores de tensão modulados por largura de pulso. O trabalho está focado na aplicação destes inversores em fontes ininterruptas de energia (UPS) de dupla conversão, com o intuito de atender aos mais exigentes requisitos de desempenho das normas internacionais. A utilização da ação de controle repetitiva auxiliar, nesta aplicação, é adequada porque o inversor demanda as características vantajosas de rejeição de distúrbios cíclicos por ela introduzida. Neste contexto, esta tese se divide em duas partes. A primeira parte compreende na proposição de algoritmos para solucionar algumas das características desvantajosas dos controladores de ação repetitiva, tal como a reduzida margem de estabilidade e o desempenho não satisfatório para sinais de referências de freqüência variável. A segunda parte, por outro lado, trata das questões relacionadas ao projeto destes controladores de ação repetitiva, sendo proposta uma metodologia que integra o projeto destes controladores ao filtro de saída de uma UPS de dupla conversão. Por fim, destaca-se que são apresentados resultados de simulação e experimentais, obtidos em um protótipo de 1kVA, para validar as propostas deste trabalho.

Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-03-27T15:05:33Z No. of bitstreams: 1 dalmocardosodasilvajunior.pdf: 7879052 bytes, checksum: 389a4104e77ceeccf54e988e08d73109 (MD5)
Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-03-27T17:57:39Z (GMT) No. of bitstreams: 1 dalmocardosodasilvajunior.pdf: 7879052 bytes, checksum: 389a4104e77ceeccf54e988e08d73109 (MD5)
Made available in DSpace on 2018-03-27T17:57:39Z (GMT). No. of bitstreams: 1 dalmocardosodasilvajunior.pdf: 7879052 bytes, checksum: 389a4104e77ceeccf54e988e08d73109 (MD5) Previous issue date: 2017-12-11
As tecnologias de Geração Distribuída (GD), geralmente, consistem em geradores modulares (em grande maioria renováveis) que oferecem uma série de benefícios poten-ciais, além de estarem mais próximos dos consumidores finais. Embora a GD possa ter colaborações como comentado, a inserção de energias renováveis na rede elétrica pode afetar a proteção e também a estabilidade da mesma, implicando em desvios na tensão e na frequência do sistema. Um dos principais problemas enfrentados é a falta de inér-cia das energias renováveis e também o aparecimento de correntes harmônicas devido às cargas não lineares. Baseado nesse cenário, e como forma de solução dos problemas comentados, surge a pesquisa de inversores multifuncionais, capazes de não só conectar tais energias renováveis à rede elétrica, mas também oferecer suporte a ela. Os serviços ancilares incluem auxílio à estabilidade de tensão e frequência, mitigação de conteúdo harmônico, equilíbrio de geração e demanda de energia, entre outros aspectos. Dessa forma, metodologias baseadas nas implementações alternativas de controle, tais como a Máquina Síncrona Virtual e o Filtro Ativo de Potência (FAP) podem ser adotadas como soluções para esses problemas. Nessa vertente, simulações em tempo real com Hardware In the Loop (HIL) no simulador digital de tempo real (Real Time Digital Simulator) (RTDS) e processamento digital de sinal e engenharia de controle (digi-tal Signal Processing and Control Engineering) (dSPACE), são ferramentas poderosas que podem auxiliar o processo de simulação das funções ancilares analisadas. Assim, nesse trabalho, simulou-se o inversor multifuncional como forma de mostrar a efetiva regulação de tensão, frequência e diminuição do conteúdo harmônico em sistemas de potência, especialmente em microrredes de corrente alternada (CA). Por fim, os resul-tados demonstram o funcionamento do sistema e podem ser usados como validação das estratégias de controle propostas.
Distributed Generation technologies generally consist of modular (mostly renewa-ble) generators that offer a number of potential benefits, while being closer to the end consumers. Although the DG present features as commented, the insertion of renewa-ble energies in the electrical network can affect the protection and also the stability of the network, implying in voltage and frequency deviations. One of the main problems faced is the lack of inertia of renewable energies and also the appearance of harmonic currents due to non-linear loads. Based on this scenario, and as a way of solving these problems, the research of smart inverters, capable of not only connecting such renewable energies to the electric grid but also supporting it, emerges. Some ancillary services as voltage and frequency stability, mitigation of harmonic content, balance of generation and energy demand, among other aspects, can be fullfilled. Thus, methodologies based on sophisticated control implementations such as the Virtual Synchronous Machine and the Active Power Filter, can be adopted as solutions to these problems. In this aspect, real-time simulations with Control Hardware In The Loop HIL in Real Time Digital Simulator RTDS and dSPACE, are a powerfulls tool can aid the simulation process of the analyzed ancillary functions. Thus, in this work, the multifunctional inverter was simulated as a way to show the effective regulation of voltage, frequency, and harmonic content mitigation in power systems, especially in AC microgrids. Finally, the results demonstrate the operation of the system and can be used as validation of the proposed control strategies.

Tendo em vista que os amidos (catiônicos ou não) não são nocivos a saúde do ser humano, uma vez que são utilizados na indústria de alimentos, e observando-se a potencialidade do seu uso como auxiliares de floculação, foi proposto o presente trabalho. Consiste na realização de ensaios de coagulação (com sulfato alumínio), floculação e sedimentação em equipamento de reatores estáticos, objetivando verificar a influência do gradiente de velocidade e do tempo de agitação na floculação com polímero sintético catiônico e amidos de milho e mandioca catiônicos. Concluiu-se que as condições de aplicação exercem influência na eficiência de remoção de turbidez e cor aparente, sendo que cada polímero estudado apresentou uma condição ótima específica. Em todos os ensaios realizados, o amido de mandioca catiônico foi o mais eficiente, indicando que os amidos catiônicos podem ser substitutos em potencial dos polímeros sintéticos no tratamento de águas de abastecimento, quando utilizados como auxiliares de floculação.
This present work was based on the fact that native and cationic starches are not harmful to man\'s health, since they have been largely used in food processing industries, and that they may be potentially used as flocculation aids in water treatment. Jar Test assays were performed, including coagulation with aluminum sulphate, flocculation and sedimentation, aiming to study the influence of the velocity gradient and mixing time on flocculation, using a cationic synthetic polymer and cationic com and manioc starches as aids. In the main, it was concluded that the conditions under which the polymers were applied, affect the efficiency of turbidity and color removals and that each polymer studied presented an specific optimum condition. It was also observed that manioc cationic starch resulted more effective than the others polymers studied, when used as flocculation aids.

Orientador: Hugo Enrique Hernandez Figueroa
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-14T12:30:52Z (GMT). No. of bitstreams: 1 Paixao_OswaldoPedreira_D.pdf: 3002384 bytes, checksum: f5a0e8e8022dabd36cfce9ffdb839f9b (MD5) Previous issue date: 2009
Resumo: Este trabalho, tem como objetivo o desenvolvimento de novas técnicas, para análise de regime permanente não-autonoma de circuitos de alta-velocidade não-lineares em grande-escala. Para tal, é proposto um novo método do balanço harmônico (BH) fundamentado em uma eficiente metodologia de decomposição multi-níveis, que subdivide um circuito não-linear em grande escala em uma estrutura hierarquica de super-redes (SuRs) esparsamente interconectadas. Mais precisamente, em cada nível de hierarquia, o circuito é composto por SuRs intermediárias, SuRs de fundo, e redes de conexão (RCs). As SuRs de fundo são decompostas em um aglomerado de subredes não-lineares (SRNs) correspondendo a dispositivos semicondutores, que por sua vez, estão envolvidos por uma sub-rede linear (SRL). A equação de estado e de sonda das SuRs de fundo foram obtidas utilizando uma nova metodologia que combina a formulação de espaço de estado (FEE) para as SRNs com a formulação nodal modificada (FNM) para a SRL. Esta metodologia FEE/FNM produz um sistema quadrado de equações com menor tamanho possível. Para realização das conversões do sinal entre os domínios do tempo e da frequência, foram discutidas e implementadas diferentes transformadas de Fourier discreta (TFDs), para operação em regime multi-tons, incluindo sinais com modulação digital. A equação determinante do BH multi-níveis do circuito assume uma estrutura hierarquica do tipo bloco diagonal com borda , que pode ser eficientemente resolvida utilizando técnicas de processamento paralelo. A matriz jacobiana de cada SuR de fundo é processada utilizando eficientes técnicas de matrizes esparsas, junto com o conceito de espectro de derivada. Para a solução da equação determinante, foram utilizados os métodos de Newton e do tensor para problemas de pequena- e média-escala, e os métodos de Newton inexato e do tensor inexato para problemas em grande-escala. A globalização via pesquisa-em-linha com retrocedimento, foi adotada para nestes solucionadores não-lineares. Entretanto, para o método do tensor e do tensor inexato, também foi adotada a técnica de pesquisa-em-linha curvilinear. Nos métodos inexatos, técnicas de pré-condicionamento foram utilizadas, para aumentar a eficiência e a robustez do solucionador linear iterativo em subespaço de Krylov (GMRES, GMRES-Bt e TGMRES-Bt). Finalmente, a formulação proposta foi validada e a eficiência do método do tensor e do tensor inexato comparada com o método de Newton e de Newton inexato, para diferentes topologias de circuitos utilizando diodos, FETs e HBTs, e operando sob diferentes regimes de excitação multi-tons.
Abstract: This work deals with the development of new techniques for nonautonomous nonlinear steady-state analysis of high-speed large-scale integrated circuits. To this end, it is proposed a novel harmonic balance (HB) method fundamented on a efficient multi-level decomposition methodology, that divides a large-scale circuit into hierarchical structure of sparsely interconnected supernetworks (SuNs). More precisely, the circuit is composed by intermediary SuRs, bottom SuRs and connection networks (CNs). The bottom SuNs are decomposed into a cluster of nonlinear subnetworks (NSNs) corresponding to the opto-electronic semiconductor devices, which in turn, are embedded by a linear subnetwork (LSN). Multi-port elements can be included in the LSN, in order to use measured data or results from electromagnetic analysis of structures with complex geometries. The formulation of the bottom SuN state and probe equations uses an improved table-oriented statespace formulation (SSF), that produces a square system with the lowest possible size, which is equal to the number of nonlinear state-variables (branch voltages and currents) that act as argument of the fuctions representing the semiconductor devices nonlinearities. The SSF is compared with the classical modified nodal formulation (MNF). For dealing with signal timefrequency conversions, discrete Fourier transform (DFT) techniques for different multi-tone regimes are discussed, including complex digitally modulated signals. The multi-level HB determining equation of the circuit assumes a hierarchical block bordered structure that can be efficiently tackled by parallel processing techniques. The HB jacobian matrix is handled using efficient sparse matrix techniques with a proper definition of the derivatives spectra. For the solution of a large-size HB problem, we investigated the applications of inexact tensor method based on Krylov-subspace techniques. Preconditioning are used to improve the robustness of the iterative tensor solver. To determine the circuit DC regime, we employ the tensor method. We adopted the backtracking linesearch technique as a globalisation strategy. However, for the tensor method, in particular, a curvilinear linesearch was also implemented. Finally, the formulation was validated and, the tensor and inexact tensor method efficiency was compared with the Newton and inexact Newton method, respectively, for several different circuits using diodos, FETs and HBTs, and operating under different multi-tone regimes.
Doutorado
Engenharia de Telecomunicações
Doutor em Engenharia Elétrica

Made available in DSpace on 2016-04-27T16:58:33Z (GMT). No. of bitstreams: 1 Shirley Ferreira Signorelli.pdf: 4346228 bytes, checksum: a37d23996da101385ce1df722242946c (MD5) Previous issue date: 2007-10-31
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The purpose of this investigation was the elaboration and implementation of a virtual environment for a part time distance course for students of the Computer Science and Systems of Information. The students failed in a former discipline that approaches topics of elementary Mathematics. It happened in a particular university in the city of São Paulo. Our focus was on analyzing this environment, the tools and interactions that happened on distance mode, about the content of real function of one variable. The methodology used, design-based research, favored proposing and analyzing the activities about this topic, as well as their reorganization and, the re design of the environment. The Blackboard platform and the used tools were analyzed based on Chaves (2000) criteria, and it seemed efficient as a virtual environment for the learning in our course. However, we leaved some critical and suggestions for future works, mainly about the role of the tools for communication within part time distance courses. The analysis of the students and teacher speeches' was based on the Model of Argumentative Strategy (CASTRO et al, 2004) and allowed to raise some aspects on the understanding of Real Functions of one variable, as they were privileged in the different interactive spaces such as forum, chat, email and daily log. Aspects like the meaning production in Mathematics can be produced due to the authority of a teacher or of another student who is considered good by the classroom peers, or based on everyday language usage or on cultural characteristics. Moreover, we found that besides the students lack of prerequisite elementary mathematics, there is a lack of a culture for on-line courses
Nesta pesquisa objetivamos a elaboração e implementação de um ambiente virtual para um curso semipresencial, para estudantes dos cursos de Bacharelado em Ciência da Computação e Sistemas de Informação de uma instituição particular na cidade de São Paulo, dependentes na disciplina que aborda tópicos de pré-calculo. Nosso foco recaiu na análise do ambiente, da viabilidade das ferramentas e das interações que ocorreram a distância, no que tange o conteúdo de Funções de uma Variável Real. A metodologia utilizada, design research, permitiu propor e analisar as atividades sobre este tópico, incluindo a reestruturação e complementação deste ambiente. A plataforma Blackboard e as ferramentas foram analisadas segundo critérios definidos por Chaves (2000) e se mostraram eficazes como ambiente virtual de aprendizagem atendendo, para nosso curso, os critérios necessários. Entretanto, deixamos algumas críticas e sugestões para trabalhos futuros, principalmente quanto o papel do uso de ferramentas de comunicação em cursos semipresenciais. A análise dos discursos dos alunos e docente baseados no Modelo de Estratégia Argumentativa (CASTRO et al, 2004) permitiu levantar alguns aspectos sobre a compreensão de Funções de uma Variável Real que foram privilegiados nos diferentes espaços interativos como fórum, chat, e-mail e diário de rotina, tais como o fato de que a produção de significados em Matemática pode estar apoiada na autoridade do professor ou alunos bem vistos pela classe, na linguagem cotidiana e no aspecto cultural. Observamos ainda que além da falta de pré-requisitos de matemática básica, ainda há falta de cultura de trabalhos on-line

碩士
龍華科技大學
機械工程系碩士班
106
This Master’s thesis improved the traditional mechanical processing which can be used to assist the high positioning accuracy by CCD vision system. The KEYENCE CV-X100A controller is used with the CV-035M CCD camera module to do the visual positioning application in this thesis, the transmission device used Orientalmotor EZS series servo motor rotary stage with AZ series stepper motor combined into 3+1 axis robot manipulator, the PLC control system used KEYENCE's KV-5500 programmable logic controller to do the system link between the visual system and the communication. The angular displacement of processed objects can be detected by the CCD vision system immediately, and through the PLC system converted the angular displacement’s pulse number and then drive the stepper motor to do rotation correction. When the position correction is completed, the visual system will immediately detect the angular displacement repeatedly until it meets the machining specifications. In this study, the cumulative error caused by the mechanical structure was minimized through the stepwise repeated positioning and correcting method. The equipment that has to be manually fed into in the past will be improved to handle the alignment by means of profiling, which can improve the automation of repeated positioning accuracy by a large margin.

碩士
輔仁大學
日本語文學系碩士班
101
The auxiliary word "ni" quite extensive and complex usage, can be expressed place, time, object, cause, result, status, etc., causing many Japanese learners unable to judge correctly lattice particle "ni" in usage. This thesis is to express action, role of place and time grid particle "ni" in usage-based, analysis Taiwanese Japanese learners grid particle "ni" Use and Misuse of the positive conditions, and to investigate the textbooks preposition "ni" in teaching order expectations observe the effect of textbooks for learners, but also tried to put forward suggestions for Japanese language education, hoping to bring a bit of Japanese language education contribution. This thesis is divided into six chapters, the following describes the structure of this thesis. The first chapter is on order. Describes the motivation and objectives, methods and scope of this thesis structure. The second chapter is the first study. Collecting Japanese Language Learning and Japanese Education preposition "ni" the first study to determine the expression of action, role of place and time grid particle "ni" the definition and classification, and proposed classification benchmarks and research. The third chapter describes the study brief. Description of information, research and analysis objects. The fourth chapter is the findings and with visits. Individual analysis of learner preposition "ni" in the frequency of use, positive, misuse conditions, and observe the learners' learning characteristics and tendencies. The fifth chapter comprehensive study for learners with learning situation textbooks preposition "ni" in guiding the order. Comprehensive analysis of learner preposition "ni" the learning situation, and then investigate the expression textbooks action, the role of place and time frame for particle "ni" in order guidance, as well as listed in the book cited with preposition "ni" and the verb used noun. The sixth chapter is the conclusion. Narrative research, and observe the position of the textbook and learners relevance, then propose suggestions for Japanese language education, and finally for the problems identified during the study point for future research.

碩士
南華大學
資訊管理學研究所
92
The main function of the marketing information system is to provide the useful information to help the salesperson doing their right way. In other words, the marketing information system is an auxiliary tool utilized to avoid incorrect intuition or to reduce speculate from the salesperson. 　 　　The purpose of the study is to construct an auxiliary marketing information system for the part-time marketers from the view point of internal marketing. In addition, the proposed auxiliary marketing system has the advantages of embedding the sales knowledge into each employee and creating an extra bonus for the company. The functional module of the proposed system are composed of hot-product (or service) query, auxiliary training course, suggestions, frequently query and answer, encouraged bulletin board, and so on. 　 　　The primary contribution of the study is to build an auxiliary marketing information system which utilized specifically for the part-time marketers. To verify the function of the proposed system, we perform the system to Chunghwa Telcom at Chaiyi Branch Office. The initial result is acceptable and reasonable.

This dissertation studies a class of path-dependent stochastic control problems with applications to Finance. In particular, we solve the open problem of the continuous time expected utility maximization with addictive consumption habit formation in incomplete markets under two independent scenarios. In the first project, we study the continuous time utility optimization problem with consumption habit formation in general incomplete semimartingale financial markets. Introducing the set of auxiliary state processes and the modified dual space, we embed our original problem into an abstract time-separable utility maximization problem with a shadow random endowment on the product space. We establish existence and uniqueness of the optimal solution using convex duality by defining the primal value function as depending on two variables, i.e., the initial wealth and the initial standard of living. We also provide market independent sufficient conditions both on the stochastic discounting processes of the habit formation process and on the utility function for the well-posedness of our original optimization problem. Under the same assumptions, we can carefully modify the classical proofs in the approach of convex duality analysis when the auxiliary dual process is not necessarily integrable. In the second project, we examine an example of the optimal investment and consumption problem with both habit-formation and partial observations in incomplete markets driven by It\^{o} processes. The individual investor develops addictive consumption habits gradually while only observing the market stock prices but not the instantaneous rates of return, which follow an Ornstein-Uhlenbeck process. Applying the Kalman-Bucy filtering theorem and Dynamic Programming arguments, we solve the associated Hamilton-Jacobi-Bellman(HJB) equation fully explicitly for this path dependent stochastic control problem in the case of power utility preferences. We provide the optimal investment and consumption policy in explicit feedback form using rigorous verification arguments.
text

Worldwide, patients who visit health-care facilities generally have to wait very long to be attended by physicians and professional nurses. In South Africa, the Cape Triage Score system was implemented with great success in Emergency departments in the Cape Metropole. In primary health-care clinics the concern is that patients have to wait too long for service delivery, even if they are very ill and need hospitalisation. In this research study the role of triage in reducing waiting times in primary health-care clinics was examined. The Cape Triage Score system that was used in Emergency departments in the private sector and also in public hospitals was adapted for a pilot intervention study. This was done to determine if the utilisation of this system can reduce the waiting times of patients visiting primary health-care clinics. The researcher utilised a quantitative design with an intervention, after measuring the baseline waiting time. The strategies applied included an exploratory, descriptive and contextual strategy. The study was carried out in three steps according to the objectives set for the study. Firstly, the baseline assessment of the current waiting times in two PHC clinics in a sub-district of the North West Province was done. A waiting-time survey checklist was used to determine the baseline waiting time of patients visiting primary health-care clinics. These waiting-time survey checklists consisted of a few components that assessed different aspects of waiting time. The second objective was to explore and describe literature in order to understand primary health-care waiting times, triage and related constructs. The third objective was to pilot an adapted Cape Triage Score system to determine if the intervention contributed to reducing waiting times for patients visiting primary health-care clinics. Data was analysed according to Cohen’s effect sizes. The comparison between the baseline waiting times and pilot intervention waiting-time assessment was done according to Cohen’s effect sizes. The analysis of the data indicated a practical significance for the component where the pilot Cape Triage Score system was applied, as patients were referred to the physician and professional nurse according to the severity of their condition. The outcome of the study indicated no reduction in the overall waiting time of patients visiting primary health-care clinics due to the different components of the waiting-time survey checklist. Finally, the research was evaluated, limitations were identified and recommendations were stipulated for nursing practice, education, research and policy.
MCur, North-West University, Potchefstroom Campus, 2014