Dissertations / Theses on the topic 'Torrent control'
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Piton, Guillaume. "Sediment transport control by check dams and open check dams in Alpine torrents." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAU041/document.
Full textCheck dams and open check dams are key structures in torrent hazard protection. Their managers must mitigate flood hazards, but now must also minimize the environmental impacts of these protection structures. This requires to improve the knowledge on the effects of check dams and open check dams on the sediment transport, and this thesis forms a contribution towards this end.The section on the current state of research reviews i) the diverse effects of check dams on sediment production and transfer; ii) descriptions of the hydraulics and sedimentation processes occurring in open check dams; and iii) woody debris production and trapping processes. This state of the art is completed with proposition of new bedload transport estimation methods, specifically developed for paved streams experiencing external supply or armour breaking.Experimental results are then provided. Firstly, flume experiments highlight the emergence of a more regular bedload transport when check dams are built in alluvial reaches. In a second stage, experiments were performed on a generic Froude scale model of an open check dam basin in order to capture the features of laterally-unconstrained, highly mobile flows. A new flow measurement and inverse-reconstruction procedure has been developed. A preliminary analysis of the results describes flows that tend toward a critical regime and the occurrence of feedback mechanisms between geomorphology and hydraulics during massive bedload deposition
Kološ, Jakub. "Návrh ochranných vodohospodářských opatření pro snížení ohrožení zastavěného území obcí Fryčovice a Hukvaldy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409731.
Full textUjházy, Adriana. "Návrh protierozních a protipovodňových opatření v k. ú. Palkovice." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409735.
Full textSilvestre, Alysson Domingos. "Desenvolvimento de heliostato para geração heliotermica em torres solares." Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/8496.
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Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
With the increase of global perspectives regarding renewable energy and the use of concentrated solar thermal energy, with the goal of increasing the flow of solar radiation incident on the thermal has been shown to be a viable solution for electric power generation. The heliostats devices have the ability to track the Sun and reflect the radiation in a pre-set fixed point, usually known as solar tracking Tower in the middle of the field of heliostats devices. The solar towers have been aim of studies because they have a great potential for electric generation. The higher the desired concentration values of the system, the higher the accuracy requirements tracking and reflection of the heliostats, and the quality of reflective surfaces will be. This study aims to design and construction of the heliostat of two degrees of freedom for power generation in solar Tower systems using control methods for tracing and reflection on LabView platform. Applying tracking algorithms based on the solar behavior equations and mechanical design, allowing a two degrees’ freedom dynamic, it was gain results with 0.201 degrees in precision in the tracking of radiation reflection.
Com o aumento das perspectivas mundiais a respeito das energias renováveis e a utilização da energia solar térmica concentrada, com o objetivo de aumentar o fluxo de radiação solar incidente em sistemas térmicos tem se mostrado uma solução viável para geração de energia elétrica. Os dispositivos heliostatos tem a capacidade de rastrear o sol e refletir a radiação em um ponto fixo pré – estabelecido, normalmente conhecido como torre solar localizando se ao meio de um campo de dispositivos heliostatos. As torres solares tem sido alvo de estudos por possuir um grande potencial para geração de energia elétrica. Quanto maior os valores de concentração pretendido do sistema, maiores serão os requisitos de precisão de rastreamento e reflexão do heliostato e da qualidade das superfícies refletoras. Este trabalho tem como objetivo de projeto e construção de um heliostato de dois graus de liberdade para geração de energia em sistemas de torres solares utilizando métodos de controle para rastreamento e reflexão ótima em plataforma LabView. Aplicando algoritmos de rastreamento baseado nas equações de comportamento solar e projeto mecânico permitindo uma dinâmica de dois graus de liberdade foi obtido resultados de 0,201 graus de precisão no rastreamento de reflexão da radiação.
Chahuara, Quispe José Carlos. "Control neuro-difuso aplicado a una Grúa Torre." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2005. https://hdl.handle.net/20.500.12672/569.
Full textTesis
Agüero, Juan Pablo. "Complejo Natania 50-Torre Mayor Beltrán-Godoy Cruz." Universidad Nacional de Cuyo. Facultad de Ingeniería, 2016. http://bdigital.uncu.edu.ar/8904.
Full textFil: Agüero, Juan Pablo. Universidad Nacional de Cuyo. Facultad de Ingeniería.
Eugenio, Fernando Coelho. "Geotecnologias na alocação de torres de observação de incêndios florestais." Universidade Federal do Espírito Santo, 2014. http://repositorio.ufes.br/handle/10/5031.
Full textNos casos em que a prevenção não é suficiente para evitar a deflagração de um foco de incêndio, a sua rápida detecção constitui um fator decisivo para que seja possível minimizar os danos provocados pelo fogo e para a redução dos custos associadas ao seu combate. Diante de tal fato, as torres de vigilância aparecem como um excelente sistema de detecção inicial do incêndio florestal. Neste contexto, esta pesquisa teve o objetivo de desenvolver uma metodologia para alocação de torres de detecção de incêndios florestais no estado do Espírito Santo, contemplando as seguintes etapas metodológicas: a) desenvolvimento de um modelo para mapear o Risco de Incêndios Florestais no estado do Espírito Santo (RIF-ES); b) mapeamento das Áreas de Preservação Permanente sob a ótica do novo código florestal no estado do Espírito Santo; c) alocação de pontos estratégicos para implantação de torres de detecção no estado do Espírito Santo, e; d) confrontar as áreas visualizadas pelas torres de detecção com o mapa de risco de incêndio e as áreas que se deve preservar (APP's + UC's). A metodologia proposta é eficaz para a alocação das torres de detecção de incêndios, sendo que, o Método C3, foi a metodologia escolhida, apresentando cobertura de 67% do estado do Espírito Santo, a partir de 140 torres de observação. As áreas que possuem o maior risco de incêndios florestais, as classes com os riscos alto, muito alto e extremo possuem uma visualização de, respectivamente, 73,97%, 70,41% e 61,03%. As APP's, com o método C3, terão 61,76% de suas áreas visualizadas com a instalação de 140 torres de observação. O Método C3, apresentou uma cobertura de 70,42 % do total das UC's do estado.
Where prevention is not enough to prevent the outbreak of a fire outbreak, rapid detection is a key factor to be able to minimize the damage caused by fire and to reduce costs associated with their fight. Faced with this fact, watch towers appear as an excellent system of early detection of forest fire. In this context, this research aims to develop a methodology for allocating towers detection of forest fires in the state of Espirito Santo, addressing the following methodological steps: a) develop a model to map the risk of forest fires in the state of Espirito Santo ( RIF- ES ) b ) mapping the Permanent Preservation Areas from the perspective of the new forest code in the state of Espirito Santo, c) allocate strategic sites for deployment of towers detection in the state of Espirito Santo, Brazil and d) comparing areas displaying the towers detection with the areas most prone to the risk of fire and areas preserved permanent (APP's + UC's). The proposed methodology is efficient for placing towers fire detection, where as the C3 Method, was the chosen methodology, with coverage of 67% of the state of Espírito Santo, from 140 watch towers. The areas that have the highest risk of forest fires, the classes with high risk, very high and extreme have a preview of respectively 73.97%, 70.41% and 61.03%. The APP's, with C3 method will have 61.76% of their areas visualized with the installation of 140 watch towers. The C3 method, showed a coverage of 70.42% of UC's state.
Colherinhas, Gino Bertollucci. "Ferramenta de otimização via algoritmos genéticos com aplicações em engenharia." reponame:Repositório Institucional da UnB, 2016. http://repositorio.unb.br/handle/10482/21832.
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O objetivo desta dissertação é criar uma ferramenta de otimização via Algoritmos Genéticos (AG) para a resolução de problemas de engenharia. A implementação da otimização é realizada para dois estudos de caso e os principais algoritmos são descritos. O Estudo de Caso 1 propõe uma metodologia de projeto do controle passivo de torres eólicas do tipo TMD-Pendular. Realiza-se a investigação do mapa composto pelos picos de resposta em frequência da torre eólica obtido pela formulação analítica 2-GdL (torre eólica+pendulo). O Estudo de Caso 2 identifica as configurações de um Trato Vocal (TV). Investigam-se as áreas da seção transversal do TV através da análise modal dos modos de vibração acústica obtidas pelo modelo de Matriz de Transferência (MT). Este estudo tem como objetivo encontrar a mesma geometria de um TV obtidos via imagens por ressonância magnética da vogal ∖∖. A ferramenta de otimização via AG implementada apresenta resultados satisfatórios para os dois Estudos de Caso de engenharia propostos. Esta ferramenta apresenta uma linguagem simples e eficiente sugerida como uma alternativa aos softwares comerciais existentes. Descreve-se a teoria do AG e diferentes estratégias evolutivas. Os algoritmos implementados são estruturados utilizando os recursos do software MATLAB. ___________________________________________________________________________________________________ ABSTRACT
The target of this work is to create an optimization toolbox using Genetic Algorithms to solve engineering problems. The implementation of the optimization are performed for two case studies and their main algorithms are described. Case study 1 proposes a design methodology of a wind tower passive control for a Pendulum TMD type, investigating the map composed by the response frequency peaks of the wind tower obtained by a 2-DoF analytical formulation (wind turbine + pendulum). Case Study 2 identifies the settings of a Vocal Tract investigating their cross section areas through the acoustical modal analysis obtained by the Transfer Matrix model. This study aims to find the same geometry of a vocal tract obained by the magnetic resonance imaging of the vowel ∖∖. This toolbox provides a simple and efficient language as an alternative for commercial softwares. It describes the theory of GA and different evolutionary strategies. The implemented algorithms are structured using the resources of MATLAB software.
Pozzobon, João Carlos. "Recuperação de água em torres de resfriamento por meio de estruturas de condensação porosas." reponame:Repositório Institucional da UFSC, 2015. https://repositorio.ufsc.br/xmlui/handle/123456789/133093.
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Torres de resfriamento são empregadas para o resfriamento de água utilizada em processos industriais. Neste procedimento, cerca de 2 a 3% do volume da água resfriada é expelida para o ambiente em uma mistura de vapor saturado e ar. Este volume de água pode ser significativo, se tornando um problema ambiental, especialmente em locais onde este insumo é escasso. Portanto, um processo que possa capturar, condensar e devolver à indústria parte desta água perdida por evaporação é importante quando se busca reduzir o consumo e empregar de forma racional este recurso. Neste sentido, o presente trabalho propõe o emprego de estruturas resfriadas por meio de conjunto de tubos de cobre, conectados em um circuito de água fria, que simulam o comportamento do evaporador de termossifões, localizados dentro das torres e em contato com o ar úmido e quente e cujos condensadores estão em contato com o ambiente. Para melhorar a performance destes dispositivos, duas estruturas de condensação em contato com os evaporadores são estudadas: uma formada por um conjunto de tubos de cobre aletados em contato com um meio poroso, e outra semelhante, porém, sem as aletas. O meio poroso estudado consiste em fitas flexíveis de aço inox espiraladas, semelhantes a uma esponja metálica porosa. Uma estrutura semelhante já foi previamente testada em bancadas adequadas, mostrando resultados promissores. Afim de testar a tecnologia proposta, foi construído em laboratório, em escala reduzida, uma torre de resfriamento de tiragem mecânica induzida com fluxo cruzado (com dupla entrada de ar). As estruturas de condensação foram inseridas no seu interior ao lado do enchimento. De uma forma simplificada, o processo a ser monitorado na torre de resfriamento assistida pelas estruturas consiste no escoamento de ar ambiente, que entra pelas laterais da torre passando pelo enchimento (sistema de calhas responsável por retardar a velocidade de escoamento da água, permitindo um maior tempo de contato entre ar e água). Depois de umidificado, o ar percola o meio poroso (estrutura de condensação), o que permite a condensação de parte do vapor contido no ar úmido. Este condensado é, por efeito da gravidade, conduzido até bandejas de recolhimento localizadas na região inferior da torre sendo o seu volume medido. O aparelho experimental em escala reduzida permite controlar a velocidade do ventilador, a temperatura e a vazão mássica de água paraser arrefecida e a temperatura e a vazão da água para ser utilizado nos tubos de cobre que simulam os termossifões. A umidade do ar ambiente e temperatura são variáveis não controladas. Os resultados apontam que a estrutura de condensação sem aleta apresentou uma capacidade maior em recuperar água, com uma porcentagem máxima de 9,36 % da água perdida pela torre, em relação à estrutura contendo aletas, com 8,18% de recuperação máxima. Esta diferença pode estar relacionada com a disposição do meio poroso nos tubos de cobre, a quantidade de meio poroso e o método de construção adotado para confeccionar as estruturas. Estudos preliminares mostram um potencial maior de recuperação de água que deve ser buscado na continuação da presente dissertação.
Abstract: Cooling towers are used to cool the water utilized in industrial processes. Through this process, roughly 2 to 3% of the volume of the cooled water is lost to the environment as a mixture of saturated steam and air. This volume of water can be significant, becoming an environmental problem, especially in places where this input is scarce. Therefore, a process that can condense, capture and return part of this water to the industry is important when seeking to reduce consumption and employ rationally this resource. In this sense, this work proposes the use of structures passively cooled through a set of copper tubes, connected in a cold water circuit, which simulate the thermosyphon evaporator behavior, located inside the towers and in contact with moist air and hot and whose capacitors are in contact with the environment. To improve the performance of these devices, two types of condenser structures, which are attached to the evaporators, are studied: one formed by a set of finned copper tubes in contact with a porous medium, and another that uses the same structure, however, without the fins. The porous medium is composed by flexible highly twisted metallic tapes, which works like porous metal foams. The condensation within this structure has previously been tested in an appropriate apparatus, showing promising results. In order to test the proposed technology, it was built in the laboratory, on a smaller scale, a mechanical draft cooling tower, cross-flow induced and with dual air intake. The condensation structures were inserted inside, next to the two fillings, which, in turn, are located close to the tower lateral walls. Therefore, the main parameter to be monitored in the cooling tower assisted by these structures is the flow of air, which enters through the side of the tower through the filling (system responsible for slowing the rate of flow of water, allowing greater contact time between air and water). After humidified, air percolates through the porous (condensation structure), which allows the condensation of the steam contained in the humid air. Therefore, as the condensed vapor forms water, droplets, these are dragged by gravity and conducted at a specific reservoir located in the bottom region of the tower. The experimental small-scale apparatus can control the fan speed, temperature and water flow to be cooled and the temperature and flow of water to be used in copper tubes, which mimic the thermosyphon. The humidity of the ambient air temperature and are not controlled variables. The results show that the condensation structure without fins had a greater ability to recover water, with a maximum percentage of 9.36% of the water lost by the tower, incomparison with the structure containing fins, which recovers the maximum of 8.18%. This difference may be related to the arrangement of the porous copper pipes, the amount of the porous medium and the method of construction adopted for making the structures. Preliminary studies show a greater potential for water recovery to be pursued in the continuation of this dissertation.
Oliveira, Eduardo Silverio de. "Da torre de babel à torre de controle: desmistificando a linguagem dos céus. Um estudo descritivo da língua franca utilizada na comunicação piloto-controlador." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/48/48134/tde-05102007-111948/.
Full textThe lingua franca used in the communication between pilots and controllers is still not well known in the academic community. Few studies about its use and mapping of its main linguistic characteristics have been made. This theoretical research introduces an accurate study on the language used in the activity of air traffic controllers and develops a descriptive study of the lingua franca used in the communication between pilots and controllers, in order to identify its main linguistic characteristics towards material production. By using the method developed by Professor André Camlong and the computational tool STABLEX, an objective descriptive and inductive analysis of a linguistic corpus constituted by the language used in the ATC specialty has been conducted. The aim of this work is to provide language teachers with subsides for ATC material production hence helping teachers to elaborate materials that meet the very specific needs of their students based on the real needs of the stakeholders so as they can establish a more fruitful and efficient language teaching and learning process.
Maia, Júlio Pereira 1978. "Simulação dinâmica, otimização e análise de estratégias de controle da torre de vácuo da unidade de destilação de processos de refino de petróleo." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266612.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química
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Resumo: Esta tese apresenta um estudo de estratégias de esquemas de controle em unidades de destilação a vácuo de refinarias de petróleo, com o uso de dados e informações de uma refinaria brasileira, de modo a se desenvolver uma simulação representativa do processo, onde uma diferença global máxima de 5% entre os resultados de simulação e os dados de saída reais foi obtida. A simulação foi executada com alto nível de detalhamento, com cálculos de queda de pressão, dimensionamento de sistemas de bombeamento e uso de internos de coluna comerciais. Uma análise paramétrica foi executada para a verificação das variáveis mais influentes do processo. A simulação em estado estacionário resultante foi então convertida para o regime dinâmico, onde um esquema de controle equivalente ao esquema de controle da planta real foi implementado. Este esquema de controle foi submetido a um conjunto de perturbações usuais ao processo real, produzindo respostas dinâmicas do processo para cada perturbação aplicada. Pela análise das dinâmicas destas respostas e das respostas do sistema em malha aberta, um esquema de controle alternativo foi proposto e verificado da mesma maneira que o esquema de controle equivalente. Malhas de controle específicas para quantificar a qualidade dos produtos, tendo por base o índice ASTM D86 foram inseridas. A comparação entre os dois esquemas de controle por meio das respostas dinâmicas na qualidade dos produtos, considerando como parâmetro o ISE (Integral Squared Error) das malhas de cada esquema para comparação, apresentou uma redução média do erro em 70% na qualidade dos produtos principais
Abstract: A petroleum vacuum distillation unit study on control scheme strategies is developed in this work. Real plant data and information is gathered from a Brazilian Refinery to develop a representative simulation of the process, which had achieved a maximum 5% overall difference from the plant results. The simulation was set to be highly detailed, including pressure drop calculations, pumping system and the use of commercial column internals (packing and plates) in it. A parametric analysis was carried in order to verify the most influent variables in the process, with respect to temperature profiles, product flows and product qualities. The resultant steady state simulation was then converted into dynamic regime, when a control scheme equivalent to the real plant control scheme was implemented. This control scheme was then subjected to a set of common perturbations that occur in the real process, producing the dynamic response of the process to each perturbation applied. By analyzing the dynamics of these responses and the open loop responses, an alternative control scheme is proposed and verified in the same manner the later one was. A specific control loop was proposed to account a petroleum product quality index, such as ASTM D86 95% recovery. The comparison of the control schemes by means of the dynamic responses considering the correlated ISE (integral squared error) of each scheme has shown an average error reduction of 70% in the main products quality
Doutorado
Desenvolvimento de Processos Químicos
Doutor em Engenharia Química
Carladous, Simon. "Approche intégrée d’aide à la décision basée sur la propagation de l’imperfection de l’information – application à l’efficacité des mesures de protection torrentielle." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEM008/document.
Full textMany torrential protective check dams have been built in French mountainous areas since the 19th century. They aim to reduce risk in torrential watersheds. Analysis of their effectiveness is needed to assess residual risk and to choose the best maintenance strategy in a context of reduced budgets. Chapter I introduces main issues due both to definition of effectiveness concept and also the several criteria and system scales that have to be assessed. Moreover, required expertise is based on imperfect information, provided by several sources with different reliability levels. To help such decisions, this thesis proposes to break down general assessment into several smaller decision-making problems. In chapter II, dependability analysis tools and Evidential Reasoning based-decision-aiding methods (ER-DAMs), using fuzzy sets and possibility theories, are chosen to help individual decisions. Chapters III to V then introduce new developments. Effectiveness concept is first defined. A multi-scale dependability analysis helps to describe each decision-making problem. ER-DAMs are then adapted to help effectiveness assessment at each system’s scale. Technical improvements are provided to these methods for a better knowledge representation and final decision. Improved methods are then associated. Finally, individual problems and associated methods are integrated in a generic methodology to help torrential protective measures’ effectiveness assessment at watershed scale. The last chapter VI focuses on discussion of integrative aspects and of ER-DAMs’ specific developments. It gives some elements to improve methods but also to help operational implementation of the generic methodology
Sogbossi, Hognon Eric Arnaud. "Etude de l'évolution de la perméabilité du béton en fonction de son endommagement : transposition des résultats de laboratoire à la prédiction des débits de fuite sur site." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30210/document.
Full textThe building reactor of the nuclear power plants are designed to provide precise containment and sealing properties in normal use situations and in the event of a nuclear accident, to prevent the spread of radioelements in the environment. Since these enclosures are made of concrete, controlling the evaluation of the permeability of concrete and its evolutions under stress would make it possible to evaluate the leakage rates that may occur over time under certain conditions. Until today, there are several techniques for measuring permeability and these techniques lead to different results for the same concrete specimen. The first study we carried out was therefore to propose a standardization of the permeability measurement: this standardization resulted in the determination of a characteristic permeability of concrete and independent of the measurement technique. In parallel with this approach, we also proposed to evaluate the permeability of concrete using observables from Non-Destructive Testing such as permittivity and electrical resistivity. The results obtained show the possibility of estimating the permeability under concrete conditions on site. The second study carried out relates to the control of the permeability under constraints. In the laboratory, we investigated the permeability of concrete specimens of different sizes under various conditions of drying, thermal stress, mechanical and coupled damage. We could establish permeability-damage models according to each source of damage. The third study carried out relates to the transposition from laboratory results to the site, using nuclear power plants mock-up of larger dimensions and representative of the actual structure (VeRCoRs at scale 1/3). All the results of the first two studies have been used and have led to calculations of leak rates and Time to Reach Steady State (TRSS) consistent with the calculation assumptions
Cortelini, Euzineri de Menezes. "Resposta e controle das vibrações de uma torre eólica usando MR-TLCD (magneto reológico-amortecedor de coluna liquida sintonizada)." Universidade Federal do Pampa, 2014. http://dspace.unipampa.edu.br:8080/xmlui/handle/riu/771.
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As torres eólicas são estruturas esbeltas projetadas para resistir a efeitos dinâmicos da ação do vento. Uma vez excitada, a torre pode entrar em ressonância ocasionando ruptura e falhas em sua estrutura, pás e rotores. Além de evitar possíveis falhas catastróficas, o sistema de amortecimento pode prevenir fadiga prematura de componentes estruturais da torre, entre eles, o gerador e as pás. A presença de amortecimento limita a amplitude de vibração quando o sistema, que sofre vibração forçada, aproxima-se da ressonância. Dentro desse contexto, foi elaborado um modelo numérico de uma torre eólica que determina a resposta da mesma sob uma excitação forçada. A excitação se deu por meio de um motor de corrente contínua desbalanceado, localizado no topo da torre. A estrutura analisada é composta por uma coluna metálica com um motor elétrico de corrente contínua desbalanceado e acoplado a um amortecedor do tipo MR-TLCD (Tuned Liquid Column Dampers with magnetorheological). Neste trabalho, foi utilizado um amortecedor semiativo, no qual consiste de um tubo em formato de ‘U’ e utiliza o fluido magneto-reológico, onde este impede o movimento de grandes amplitudes sujeito à ação de forças externas. No MR-TLCD é possível diminuir a energia cinética do fluido através da válvula de controle. O Magneto Reológico, quando submetido a um campo magnético, aumenta significativamente a sua viscosidade aparente. A equação de movimento do sistema acoplado entre a torre, motor elétrico e MRTLCD foi formulado através das equações de Lagrange. Nesta dissertação, apresentam-se as respostas dinâmicas regulares e caóticas de uma torre eólica com um amortecedor do tipo MR-TLCD através do método numérico da dinâmica não linear, utilizando-se da série temporal, do retrato de fase, do espectro de Fourier (FFT) e das curvas de ressonância. Com ensaios experimentais foram obtidos os valores dos parâmetros das configurações físicas e geométricas da estrutura a serem utilizados nas experiências numéricas.
The wind towers are slender structures designed to handle the dynamic effects of wind action. A once excited, the tower can resonate causing rupture and failures in structure, blades and rotors. Besides preventing possible catastrophic failure the damping system could prevent premature fatigue in structural components of the tower between them the rotor and blades. The presence of damping vibration is limited when the system suffer forced vibration approaches of the resonance. In this context was developed a numerical model of a wind tower which determines the response of the structure under a forced excitation. The excitation was done by a dc motor unbalanced situated on the top of the tower. The structure consists of a metallic column with an electric unbalanced dc motor attached to a MR-TLCD damper. This dissertation was presented a Semi-active damper in which consists in U-tube format using magneto rheological fluid (Tuned Liquid Column Dampers with magneto rheological, MR-TLCD). The fluid existing inside the U-tube prevents the movement of large amplitude subject to the actions of external loads. In MR-TLCD is possible to reduce the kinetic energy of the fluid through the control valve. The fluid used in this work, when exposed in a magnetic field significantly increases its apparent viscosity. The motion equation of coupled system between the tower, electric motor and MRTLCD was formulated using the Lagrange equations. This dissertation was presented the regular and chaotic dynamic of a tower using a MR-TLCD damper through the numerical method of nonlinear dynamics, utilizing a time series, phase portrait, Fourier spectrum (FFT) and resonance curves. The characteristic of experimental model was used for developed the numerical model. Also the free vibration tests were utilized for determine the structural parameters of the system.
Encina, Flores Nicolás Ignacio. "Diseño e implementación de sistema de control de helióstatos para una planta de concentración solar de potencia de torre de pequeña escala." Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170587.
Full textEl proyecto Solarbosch, de la empresa Enerbosch, es un proyecto de una central de concentración solar de torre de pequeña escala, que busca aprovechar el gran potencial solar existente en Chile, sobre todo en su zona norte. Varios son los desafíos que deben ser abordados en el diseño de una planta de estas características; uno de ellos y tema principal del actual trabajo de memoria corresponde al control automático de los helióstatos encargados de redirigir la radiación solar hacia la torre. El requerimiento principal que estos deben cumplir corresponde a que el error de apunte sea el menor posible. En primer lugar, se desarrolla un modelo matemático que describe el movimiento de un helióstato con geometría de movimiento de tipo pitch/roll. Este modelo es vital para calcular la posición que debe adoptar un helióstato con el objetivo de apuntar a la torre; pero además, es necesario para desarrollar la metodología de calibración basada en el uso de una superficie objetivo ubicada en la torre central, la cual permite realizar mediciones de error. Para lograr esto último, el modelo considera posibles errores geométricos de construcción y/o instalación del helióstato, los cuales pueden ser estimados utilizando las mediciones mencionadas. En segundo lugar se presenta el sistema de control desarrollado, el cual funciona completamente en lazo abierto, siendo esto posible gracias a las ventajas que presentan los motores paso a paso en tal contexto. La posición del Sol se calcula con un algoritmo especial para aquello, luego, el modelo geométrico desarrollado es utilizado para calcular la posición que debe adoptar el helióstato en función de su posición relativa a la torre. El sistema diseñado fue aplicado e implementado en un helióstato prototipo, el cual fue construido en el contexto de un trabajo de memoria multidisciplinario entre las especialidades de Ingeniería Civil Eléctrica y Mecánica. Finalmente, para validar la metodología de calibración implementada se realizan simulaciones y pruebas en terreno utilizando el helióstato prototipo construido. De las simulaciones se obtiene que la metodología permite corregir el seguimiento de los helióstatos de forma eficaz siempre y cuando las medidas de calibración sean lo más variadas posible, esto quiere decir que hayan sido tomadas durante distintos días del año y a distintas horas. Por otro lado, las pruebas en terreno validan que el sistema de control y la metodología de calibración implementados efectivamente funcionan para un helióstato real. Como trabajo futuro se plantea que aún deben realizarse pruebas en terreno ubicando el/los helióstatos prototipos a distancias más alejadas de la superficie objetivo de calibración. Por otro lado, también debe extenderse de forma funcional el sistema de control implementado para que pueda operar en una planta con un mayor número de helióstatos.
Romanella, Lucrezia. "Realtà aumentata per la gestione del traffico aereo: progettazione di un’interfaccia per il controllo di torre." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Find full textRampino, Tiziano. "Realtà aumentata nel controllo del traffico aereo: sviluppo di una soluzione per la torre di controllo." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Find full textMárquez, Rojas Pedro Alejandro. "Informe sobre Expediente N°008-2010/CLC, procedimiento administrativo sancionador contra Albis S.A., Boticas y Salud S.A.C., Boticas Torres de Limatambo S.A.C., Farmacias Peruanas S.A., Eckerd Perú S.A., Mifarma S.A.C. y Nortfarma S.A.C., por la comisión de prácticas colusorias horizontales, en la modalidad de fijación concertada de precios a nivel nacional." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2021. http://hdl.handle.net/20.500.12404/20089.
Full textThis legal report analyzes the problems arising from the administrative sanctioning procedure against Albis S.A., Farmacias Peruana S.A., Eckerd Perú S.A., Mifarma S.A.C. and Nortfarma S.A.C., for the commission of horizontal collusive practices, in the form of concerted fixing of sales prices, at national level, in the period 2008-2009. In this regard, this paper makes use of categories and institutions of Administrative Law, as well as other branches of Law, such as Constitutional Law, in order to determine (i) whether it is possible to attribute administrative liability to any economic agent involved in concerted price fixing, (ii) whether the rights of defense of the persons administered have been violated and (iii) whether the application of the legal categories of "facilitator" or "intermediary" is feasible. Subsequently, the results of this investigation show: first, that liability can be attributed to any competing economic agent that has participated in a horizontal collusive practice. Second, from the initial notification to the issuance of the administrative act, the principle of contradiction and the principle of prohibition of defenselessness, which are part of the right of defense of the pharmaceutical chains, have been guaranteed. Third, in accordance with the principles of typicality and nonretroactivity, there is no possibility of attributing administrative liability to any economic agent that has participated as a facilitator or intermediary.
Dirickson, Yuri Maximilian Rottner. "Metodologia de análise de impacto em segurança crítica da automação das tarefas do controlador de tráfego aéreo da torre de controle de aeródromo." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-29082016-135810/.
Full textWith the increasing growth of aviation as mode of transportation for people and cargo, the Air Traffic Management (ATM) system is on its limits. In order to cope with that, the International Civil Aviation Organization (ICAO), together with country members, developed a new ATM concept called CNS/ATM, bearing several technological improvements with the objective of enhancing capacity and performance of the system, where many of these improvements are automated tasks of human operators, pilots and air traffic controllers (ATCo). In time, it was seen that technological improvements were not enough it was necessary a greater integration between all ATM systems, which would guarantee an interoperability between them. Therefore, the CNS/ATM concept evolved to a Global ATM concept, in which the modernization plan would occur globally and integrated, including many of the improvements of the CNS/ATM concept. This paradigm shift raised several questions on how these changes would affect in the actual system from an economic, environmental, performance and safety points of view. To understand the hazards of the new tasks, several traditional techniques and models are used, like Fault Tree Analysis (FTA) and Error Tree Analysis (ETA). These traditional techniques see accidents because of a chain of failure events, all with an effect-cause relation. This assumption is no longer considered enough in order to understand how accidents occur in actual systems, which became more complexes and more software dependents. To cope with this difficulty, other models were created to understand accidents using systems theory, for example the Systems-Theoretic Accident Model and Processes (STAMP). Several studies show that these models or methods are capable of finding more problems in control structure that the traditional techniques, including organizational factors. Considering all the facts, this scientific investigation propose a methodology for analysis of the impact on safety for the automation of ATCo from Control Tower (TWR) tasks. This methodology consists in modeling the accidents and hazards of the TWR ATCo tasks using STAMP. Then the Systems-Theoretic Process Analysis (STPA) technique, created for STAMP, is used to gather all causal factors for hazards and its safety requirements in each scenario, in order to compare what changed with the automation of tasks. The objective of proposed methodology is to obtain a systemic and objective way of finding the possible impact on safety from the automation of a specific task, enabling the possibility of determining the best way of designing the automation in the context of ATCo, contributing to the safe modernization of ATM system.
Geraldis, Erik Augusto. "Proposta de ferramenta para o gerenciamento do risco operacional nas operações realizadas pela torre de controle no Aeroporto Internacional de São Paulo - Guarulhos." Instituto Tecnológico de Aeronáutica, 2012. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2175.
Full textYang, Saiqi [Verfasser], Brigitte [Akademischer Betreuer] Poppenberger-Sieberer, Ruiz Ramón A. [Gutachter] Torres, and Brigitte [Gutachter] Poppenberger-Sieberer. "Characterization of the AMP1 regulatory network in the control of shoot meristem function in Arabidopsis / Saiqi Yang ; Gutachter: Ramón A. Torres Ruiz, Brigitte Poppenberger-Sieberer ; Betreuer: Brigitte Poppenberger-Sieberer." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1173322663/34.
Full textYang, Saiqi Verfasser], Brigitte [Akademischer Betreuer] [Poppenberger-Sieberer, Ruiz Ramón A. [Gutachter] Torres, and Brigitte [Gutachter] Poppenberger-Sieberer. "Characterization of the AMP1 regulatory network in the control of shoot meristem function in Arabidopsis / Saiqi Yang ; Gutachter: Ramón A. Torres Ruiz, Brigitte Poppenberger-Sieberer ; Betreuer: Brigitte Poppenberger-Sieberer." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1173322663/34.
Full textCarrelli, Magda. "Interazione uomo-macchina e controllo del traffico aereo: sviluppo di un caso applicativo per la torre di controllo." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20461/.
Full textArroyo, De Los Santos Fiorella Leslie, and Pacheco Carla Ximena Pacheco. "Planeamiento, seguimiento y control de subcontratistas de acabados humedos en obras de construcción, aplicado al proyecto de edificación de oficinas “Torre Tekton” en la ciudad de Lima." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2016. http://hdl.handle.net/10757/621562.
Full textGruber, Vilson. "Sistema de monitoramento remoto baseado em rede de celular GSM/GPRS para gerenciamento de desgaste de pastilha de freio e vibração da torre em aerogeradores." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/77204.
Full textWith the need to obtain the information be made available in several places simultaneously, showing results online, means that the networks of communication of data are increasingly present in the day-to-day of people and businesses requiring the constant search for new techniques and means to establish such communication. Enabling systems for monitoring, surveillance and control of data online in machinery and equipment in real time, nothing is not an easy task. In investment strategy, the choice of appropriate network and the means to establish this communication in the integration of the various equipment distributed in different locations (remote) is an important factor for the success of the data that we want to track. The present work shows the wireless communication technologies-Wireless and Mobile through a search and case study done in the laboratory and UFRGS and SATC College with the creation of a prototype of an interface for data acquisition using the GSM / GPRS cellular network to simulate the transmission and reception of data to the remote monitoring of 02 (two) variables here defined as vibration of the tower and wear of the brake chip in wind power of small. The data studied here show us results that can be useful for any business that plan deploy a system for remote monitoring via the Network Mobile (GSM / GPRS). Although the experiment have used variables of a wind power, are shown other possible applications of remote monitoring using the channel of communication wireless.
Pelatti, Simone. "Progettazione e realizzazione di un sistema di eye-tracking per la generazione di contenuti in realtà aumentata in torre di controllo." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19049/.
Full textMoge, Charlotte. "La construction d'une mémoire publique de la lutte contre la mafia de 1982 à 2012 à partir d'un martyrologe : Pio La Torre, Carlo Alberto dalla Chiesa, Giovanni Falcone et Paolo Borsellino." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAH030/document.
Full textThough the Mafia has become recently an object of study, the Antimafia remains a black hole in the historiography of the Mezzogiorno while the assassinations of officials constitute tense moments in the history of Republican Italy. We have chosen to focus our attention on four emblematic figures that were murdered by the Mafia over its 1982 and 1992 outbursts of violence: Pio La Torre (deputy and regional secretary of the PCI); Carlo Alberto dalla Chiesa (assassinated while he was Palermo prefect); Giovanni Falcone and Paolo Borsellino (magistrates). In order to observe how a public memory of the fight against the Mafia was built, we use a panel of sources that is typical of the present time history: archives, press, written and audiovisual memory productions, but also oral sources thanks to the interviews we lead during our field investigation. These sources allow us to understand the context as well as to analyze the evolution of the representations of the anti-mafia fight’s martyrs.The first part is dedicated to the study of the moment when these four officials were assassinated and an immediate memory built. The analysis of the press, in the wake of the outbursts of violence of the Mafia, brings out the characteristics of the immediate memory of victims, and reveals an unprecedented anti-mafia civil mobilization. The second part deals with the elaboration and the institutionalization of the victims’ memory, through the study of the commemorations and the representations. The cross-study analysis of our various sources brings to light the different strata of the memory elaboration. Finally the third part shows that the anti-mafia memory, though institutionalized and structured, is actually a tormented memory, as is revealed by the justice breaches, the political uses of the anti-mafia memory or the conditioning effect of current events on the decennial commemorations. Making the history of the anti-mafia memory thus allows us to reveal under a new light a number of tensions that are characteristic of contemporary Italy. Therefore the memory of the fight against the Mafia appears as a privileged observatory to examine the political, societal and cultural mutations of Republican Italy
Veyrat-Charvillon, Stéphane. "ELABORATION D'UNE MÉTHODE DE PRÉDICTION DU VOLUME MAXIMAL D'UNE LAVE TORRENTIELLE (PREVENT)Géomorphologie torrentielle,Topographie de terrain et Stéréophotogrammétrie sur photographies aériennes d'archivesTorrents du Manival, du Merdarêt et des Arches (Alpes-du-Nord, Isère, France)." Phd thesis, Clermont-Ferrand 2, 2005. https://tel.archives-ouvertes.fr/tel-00011428.
Full textLin, Yuan-Chiao, and 林原巧. "Applicability of Open-slot Groundsills in Torrent Control." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/53885479066454484522.
Full text國立屏東科技大學
水土保持系
94
Natural streams often follow the principles of self-adjustment to balance the variations in geometry and hydrology of the watershed. Nevertheless, the construction of groundsills in series divides a stream into segments that dissects ecological corridor and affects wildlife habitats. The objective of this research is to investigate the applicability of groundsill open slot patterns in creating diversified bedforms in a straight channel through series of flume experiments. Shannon Diversity Index was used to quantify the bedform diversity; whereas, Darcy’s friction factor was used to quantify the bedform frictional resistance. Preliminary results of this study can be summarized as the following: (1)Variations in bedforms are the results of flow regime, sediment characteristics, and open-slot patterns of the groundsills. (2)Multi-slot groundsills provide greater diversity in bedform than conventional groundsills, so that SDI increases from 0.261 for conventional groundsills to maximum 2.093 for single open-slot groundsills. (3)The power of the stream increases as water block ratio of the open-slot groundsills decreases. Therefore, conventional groundsills that providing no concentration of inflow have better control in channel scour. The maximum scour depth that conventional groundsill creates reaches only half of that produced by single-slot groundsill. (4)As the channel gradient is flat, low water-block-ratio groundsills;such as single- or double-slot groundsills, are preferable due to better flow concentration that creates diverse bedforms. (5)As the channel gradient becomes steep, groundsills with high water-block-ratio; such as four-slot groundsills are the optimum choices. Because high water-block-ratio groundsills scatter the power of the stream which control the scour depth and maintain ecological corridor in the streams.
Chung, Chi-Ning, and 鍾吉寧. "An Investigation of Torrent Control Revetment Techniques at Lichi Formation Mudstone." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/27829460170977012146.
Full text國立屏東科技大學
土木工程系所
102
Information from historical record shows that the invasion of typhoons and the occurrence of heavy rains have a high probability in eastern Taiwan, coupled with rapidly water flow from high mountain and fragile geology, located in the Southern Coastal Range of Lichi formation mudstone, the bad land terrain can be formed due to erosion and cutting of surface runoff. In order to understand the effectiveness of torrent control and the construction of facility for revetment project under the special geological condition over the years, the Lichi formation area in Taitung is chosen as the study area in this study. The field survey method is used to understand the torrent control revetment type and the characteristics in this region. The on-site field survey shows that torrent control revetment had six types including stone revetment, concrete masonry revetment, reinforced concrete revetment, gravity concrete revetment, gabion revetments, and precast box revetment. The results show that revetment facilities of concrete masonry revetment and gravity concrete revetment have greater number before the year of 2002. After that, the types of stone revetment, gabion revetments, and precast box revetment have greater number. From a functional assessment and preliminary assessment of the environmental impact, gabion revetment and precast box revetment have the characteristics of high permeation structure to drain water, and those engineering works may be more suitable in the mudstone areas.
Li, Shing-Shiau, and 李信孝. "Ecohydraulics of Fish Habitats in Torrent Control Engineering-A Case Study on Dago Stream." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/23534610074061959293.
Full text國立臺北科技大學
環境規劃與管理研究所
91
This paper intends to establish a mechanism by using Froude number to associate the relationship between flow types and fish habitats. In open channel hydraulics, Froude number, which contains two variables: water depth and water velocity, is extensively applied to describe flow type. To utilize single hydraulic variable as Froude number to simplify two variables, water depth and water velocity to describe the difference of flow types. The study sites were located in Dago Stream, Neihu district, Taipei City, Taiwan, with aim to find the confident intervals of fish habitat occurrence proportion and Froude number distribution in regular flow. After fieldwork in Dago stream, there are eight aboriginal fishes, however the Scaphesthes barbatulus and is excluded from this statistic due to the small sample sizes. The Hemibarbus labeo habitat was most likely to occur at lower Froude number class from 0.3 to 0.4. But the Monopterus albus was most likely to occur at higher Froude number class from 0.4 to 0.8. Zacco pachycephalus, Acrossocheilus paradoxus, Rhinogobius brunneus and Candidia barbata were extensively existed the range of Froude number between 0.3 to 1, but the optimum habitats of Rhinogobius brunneus and Candidia barbata appear from 0.8 to 1.1. These information can be applied to reconstructe an Environment of habitat heterogeneity and biodiversity which depends on changes of channel morphology when torrent control.
Yen, Kuang-Chih, and 顏廣智. "Study on Torrent Control Plan in Bagua Mountains Ershui Township Area as an Example." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/g25tc6.
Full text國立中興大學
水土保持學系所
101
Owing to steep topography, fragile geology, soft soil and urgent short river flow, during heavy rain comes, torrent rivers often rely on a large number of sediment down, even forms debris flow. People in the downstream region pose serious threats to life and property. In recent years due to climate becoming more extreme effects, So that the original single type of disaster evolved into a more diverse composite type of disaster. In Taiwan the catchment management planning In usual to watershed conservation and disaster prevention projects as the main measures, In recent years already of great importance to conservation of the natural environment and moving toward the ideal of sustainable management. And for the effective governance, more need for the geographical characteristics of each catchment area, with a variety of environmental disaster or are to adopt appropriate construction methods. In this study, physiographic, hydrology, water and sediment mathematical analysis to estimate the amount of such multi-faceted as the consideration, analysis of poorly cemented the Toukoshan Formation Huoyan Shan-phase region and streams, remediation planning and design, and in the wild within the protection forest Ershui Creek study area is for Watershed Management planning of disaster investigation and treatment. Analysis and Discussion the results of this study, it found that: 1. Four streams in the study area upstream areas of geology are Toukoshan Formation Huoyan Shan phase, due to poor cementation, erosion resistance is poor, it is easy to collapse during heavy rains. And with the floods and streams on the sediment entrainment to downstream fast, easy slope suddenly slowed due to the occurrence of stagnant accumulation in river sediment, resulting in cross-section due to insufficient rains flooded often caused by diffuse, even causing traffic disruption. 2. This study belonged to the protection forest forest ended sediment defend its delineation purpose in protecting Toukoshan Formation Huoyan Shan-phase regions, in order to prevent the destruction of human and natural factors caused by sediment disaster, so its upper terraces of the drainage to review and make overall planning and trying to avoid runoff into protected forest inside an opportunity to reduce the hazard. 3. The current upstream and downstream of the regional drainage design peak flow with different standards, are prone to cause flooding downstream of the crux of the proposal to meet the convergence with the upstream and the downstream flow of the design standards should to improve, it is best to refer to the upstream standards. 4. The global climate change caused by the frequent extreme hydrological events are also becoming more serious hazard problem one of the elements suggested by the Commission and other regulatory systems, a comprehensive review of the rivers in the hilly areas of the plains into the drainage system standard series should be adjusted.
Liu, Cheng-Chang, and 劉承璋. "Study on The Potential Debris Flow Torrent Control Methods of Small and Steep Watersted in Taitung Rift Vallage--A Case Study of The Special Soil and Water Conservation Area in Taitung DF020 Potential Debris Flow Torrent." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9bc8m4.
Full text國立屏東科技大學
水土保持系所
106
Taitung County is located in eastern Taiwan close to the Central Mountain Range.The hillside occupies 94 percent of area. As of 2018, there are 166 the potential debris flow torrent. According to data analysis, there are 32 debris flow torrent types of potential debris flow torrent belonging to small and steep Watersted. Ifwe can establish a good governance approach,It will be beneficial to reduce the waste of government resources and safeguard the rights and interests of the people.In this case study, a case study was conducted using the standard disaster case “ the special soil and water conservation area in Taitung DF020 potential debris flow torrent”.Five themes are discussed includingSoil and Water Conservation in Agricultural and Forest Lands, Management of Landslide, Safe Drainage, Potential Debris Flow Torrent andExisting facility maintenance management.Discussion results mentioned the ways of hillside development and utilization to manage improvement and Suggestion of landslide control. In addition, the bank of the potential stream of the earth and rocky stream is mainly project-based, with the goal of stabilizing and maintaining adequate flood-cross sections.Avoid panning and overflowing. Among them, the establishment of a settling basin in the middle and lower reaches is particularly important.The downstream needs safe drainage and related enough settling basin.It is also recommended that all districts regularly check and maintain the effectiveness of existing governance facilities. During the discussion, it was learned that the main problem of protential debris flow torrentatof Small and Steep Waterstedin the Rift Valley in Taitung is that the downstream soil sand cannot be naturally transported, resulting in silting. Therefore, it is suggested to use multiple settling basin in the middle and upper reaches to keep the soil on the slopes.Downstream settling basin are regularly cleaned by human to maintain efficiency.The concept of soil amortization should be a better way of governance.
Wu, Kuo-Chin, and 吳國欽. "Study on the Efficiency of Torrent Control by Riverbed Girdles in Laterite Terrace─A Case of Da-Bay-Kern creek in Lung-tan , Tao-yung county." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/92057889491446677301.
Full text國立臺灣大學
森林學研究所
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Sabo dam, Submerged dam, Groundsill work and Riverbed girdle are major engineer construction in creek management in Taiwan up to the present. It’s obvious that their effect in protecting steep streambed stability in Taiwan. The purpose of this study was to investigate the efficiency of Riverbed girdles in torrent control at laterite terrace area, that have the function of dredging, regularizing, reducing erosion and adjusting riverbed slope of up-stream riverbed having coarse debris. The study area located at Da-Bay-Kern creek in Lung-Tan County. To analyze riverbed variation by surveying profile and cross-section after heavy rain caused by typhoon. And we took grand size analysis at up-stream, middle-stream and down-stream to analyze the variation of debris size. In analyzing results, that Riverbed girdle was better than Groundsill work in the opinion of economy and landscape . To the variation in profile of the stream, the up-stream was more significant than the down-stream. The streambed protected by the Riverbed girdle was more stable and showed the state of deposition. To the variation in cross-section, due to the stream is sinuous and the proper position of Riverbed girdle, the phenomenon of erosion at convex zone was improved and the phenomenon of deposition at concave zone was increased. Keywords: Sabo dam, Submerged dam, Riverbed girdle, Groundsill work。
Gil, Cátia Vanessa Figueiredo. "História da conservação dos solos na Ilha de Porto Santo, Madeira." Master's thesis, 2016. http://hdl.handle.net/10362/18470.
Full textSoils are formed through long periods of time, understood as “one of the most important resources of the Biosphere and the World’s Natural Heritage” (Meneses, 2011, p. 5). It has environmental, economic, social and cultural functions, vital for life. Erosion by water is one of the most important processes of soil degradation and a critical threat to the environment nowadays, worldwide. The great impact of this process in Portugal at the end of the Nineteenth century and the beginning of the Twentieth century led to the development of several studies and torrent control works, with the goal of stopping/mitigating the phenomenon. In the Porto Santo Island the erosive process is very intense due to the reduced number of areas with native vegetation and reforested areas, besides the arity of its climate and the very nature of its land, responsible for the poverty of its soils. The rainfall is directly responsible for the torrential regime of the island's water lines and therefore, for the water erosion processes. On the other hand, since its discovery until the mid-twentieth century a progressive destruction of the vegetation cover of Porto Santo could be seen, by anthropogenic factors. For that reason, from 1952 the Circunscrição Florestal da Madeira developed an important work to promote and defend the natural heritage of the island, with various types of intervention, including reforestation and torrent control and soil defence against erosion works. Torrent control had a great expression on the Island, having been performed throughout the majority of its water courses. Within this, stand out eighteen intervened rivers by building dams (mostly of brick or flagstone), fences and tree planting, among others. Taking into account all this work, one would expect that almost half a century later, these works would continue to perform their function, noting an improvement of the system of the water courses and the morphology of the slopes with a decrease of the resulting forms of erosion. The analysis of current photographs and the comparison of photographs of the "before" and "after" of these works and its surroundings revealed that, although a good number of dams are still in good conditions nowadays, many others are in need of maintenance, with its function in risk of being affected. Reforestation, despite apparently successful in most peaks, is still missing in others, including the West slope of Pico da Ana Ferreira, Cabeço do Zimbralinho and Portela, being these places the ones we can observe the best examples of the effects of water erosion. Thus, it is suggested a continued maintenance of these works and the continuation of the lining of the forest areas most susceptible to the erosion phenomenon, so that the quality of the island's soils can recover effectively.
Sterling, Shannon M. "The influence of bedrock type on the magnitude, frequency and spatial distribution of debris torrents on Northern Vancouver Island." Thesis, 1997. http://hdl.handle.net/2429/6563.
Full textOliveira, Nuno Filipe Almeida. "Metodologia de Fiscalização de Obras : Controlo de conformidade em instalação de pré-esforço de torre de aerogeradores." Dissertação, 2010. http://hdl.handle.net/10216/58946.
Full textOliveira, Nuno Filipe Almeida. "Metodologia de Fiscalização de Obras : Controlo de conformidade em instalação de pré-esforço de torre de aerogeradores." Master's thesis, 2010. http://hdl.handle.net/10216/58946.
Full textGuimarães, Julliana Alves. "Análise dinâmica de torre eólica e dimensionamento de amortecedor de massa sintonizada." Master's thesis, 2020. http://hdl.handle.net/10198/22799.
Full textThe importance of using vibration control system in wind generators and the search for the correct implementation of these control devices, have been the subject of increasing research in recent times due to the increased use of this technology for the production of electrical energy. In this context, the present work sought to introduce concepts pertinent to the design of a passive damper, known as TDM (Tuned Mass-Damper), and to apply them to the case of a wind tower present on the IPB Campus. Therefore, it was necessary to perform a dynamic analysis for this structure through finite elements method, using the ANSYS software, in order to obtain its natural frequencies and vibration modes. This information is essential to the calculation of the optimal TMD’s parameters, where it was proposed that it be used to attenuate the vibration of the tower in its first natural frequency. After that, some simulations were performed using MATLAB software in order to observe the structure response after the introduction of the TMD. The responses obtained showed a significant reduction of tower vibration, especially when greater mass values were used. In addition, it was observed that for cases where the optimal TMD’s parameters are not used properly, the vibration attenuation occurs in a less satisfactory way. Through these results, it was possible to demonstrate the coherence of the calculations performed and the simulations made, presenting this work, therefore, important contributions to the future construction of the TMD.
Dupla diplomação com o CEFET/RJ - Centro Federal de Educação Tecnológica Celso Suckow da Fonseca
Freitas, Sandra Filipa Amaral de. "Análise e dimensionamento de cintas helicoidais em torres tubulares de telecomunicações para controlo do efeito do desprendimento de vórtices perante a ação do vento." Dissertação, 2015. https://repositorio-aberto.up.pt/handle/10216/90131.
Full textFreitas, Sandra Filipa Amaral de. "Análise e dimensionamento de cintas helicoidais em torres tubulares de telecomunicações para controlo do efeito do desprendimento de vórtices perante a ação do vento." Master's thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/90131.
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