Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-04-06T14:20:59Z No. of bitstreams: 1 israelfilipelopes.pdf: 3821077 bytes, checksum: 03973b1d4356ce4b46316762af40ac71 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-04-24T03:51:36Z (GMT) No. of bitstreams: 1 israelfilipelopes.pdf: 3821077 bytes, checksum: 03973b1d4356ce4b46316762af40ac71 (MD5) / Made available in DSpace on 2016-04-24T03:51:36Z (GMT). No. of bitstreams: 1 israelfilipelopes.pdf: 3821077 bytes, checksum: 03973b1d4356ce4b46316762af40ac71 (MD5) Previous issue date: 2013-02-26 / Este trabalho apresenta um estudo sobre transferência de energia elétrica sem contato para carregamento de baterias de veículos autônomos subaquáticos (AUV - Autonomous Underwater Vehicles) utilizando transformadores de núcleo separado (TNS). Inicialmente, é feito um projeto para construção de um transformador de núcleo separado. Posteriormente, são desenvolvidas as equações que modelam o funcionamento do transformador, com base em seu circuito elétrico equivalente. Em seguida, o trabalho propõe uma alternativa para estimar os parâmetros do circuito equivalente do transformador operando com valores de entreferro diferentes, validando seu modelo matemático aproximado com simulações realizadas no software PSIM, versão 9.0. Com o modelo matemático do TNS, é feita uma avaliação da sua capacidade de transferência de energia, mostrando que, em virtude do entreferro, o transformador apresenta baixa eficiência e baixos valores de tensão de saída. Nesse sentido, metodologias para compensar os efeitos de queda de tensão na impedância de dispersão, bem como aumentar a eficiência do transformador, são investigadas introduzindo-se capacitâncias no circuito elétrico equivalente e variando-se a frequência de operação. Aplicando os resultados dessa metodologia de otimização, é mostrado, por meio de experimentos em laboratório, que o TNS é capaz de transmitir energia através de um entreferro de 10 mm, atendendo às condições de tensão e potência da carga, com eficiência relativamente elevada. Em seguida, é feito um experimento com água do mar a fim de verificar a aplicabilidade do TNS em veículos subaquáticos. Por fim, é apresentada uma simulação digital realizada no software PSIM, versão 9.0, com um conversor c.c./c.c. controlador de carga para o sistema de carregamento de bateria. Os resultados obtidos demonstram o funcionamento do sistema, verificando a metodologia para estimativa do modelo e a metodologia de otimização do TNS. / This work presents a study on contactless electrical energy power transfer for charging batteries of autonomous underwater vehicles (AUV - Autonomous Underwater Vehicles) using transformers with separated core (TNS). Initially, a project is made for building a transformer with separated core. After, the equations that model the operation of the transformer, based on its electrical equivalent circuit, are developed. Then, the work proposes an alternative to estimate the parameters of the equivalent circuit of the transformer operating with different gap values, validating its mathematical model with simulations in PSIM software, version 9.0. With the mathematical model of TNS, an evaluation of its ability to transfer power is made, showing that, because of the air gap, the transformer has a low efficiency and low output voltage. Therefore, methodologies to compensate for the effects of voltage drop in the leakage impedance and increase the efficiency of the transformer are investigated by introducing capacitances in the equivalent circuit and varying the of operating frequency. Applying the results of optimization methodology is shown, through laboratory experiments, that the TNS is capable of transmitting power through an air gap of 10 mm, given the voltage and load power conditions, with relatively high efficiency. Then, an experiment is done with seawater in order to verify the applicability of TNS for underwater vehicles. Finally, the work presents a simulation in PSIM with a d.c./d.c. charge controller for battery. The results demonstrate the operation of the system, verifying the methodology for estimation of the model and optimization methodology of TNS.

The main objective of this work is to analyze current trends in contactless payments and consequently implement it on the Czech market. On this base this thesis deals with several wearable devices. Furthermore on this base is also working in the application part, where is one of the secondary objectives of the work to determine consumer preferences on the market of the Czech Republic. One of the secondary objectives is create a brief summary of the history of payment cards and within the sociological aspect to find a certain analogy in introducing innovations in the field of payments towards current trends in contactless methods. Within the secondary objectives there are simultaneously defined key assumptions forms of payment for success on the market. The following section focuses on electronic payments. Specifically, it deals with trends in electronic payment services, where for its implementation aren´t required the physical presence of the card or chip. Furthermore there are analyzed alternative paths in the current payment methods, namely peer-to-peer platforms. On these platforms is based shared economy, which also represents an interesting potential for the possible development of payment field. Chapter with alternative methods for cashless is finished by analyzing digital currencies. The hypothesis of this thesis is whether Apple can have an impact on the area of contactless payments and how it can affect the entire sector. Part of the hypothesis is the claim that Apple manages to change the area of contactless payments, such as happenede in the music industry with iTunes and then in the telecommunications industry with a revolutionary iPhone. Potential benefit of Apple is defined by the method of description. Potential contribution of Apple Pay is characterized by logical deduction base on previous relationships. Conclusion is by quantitative research method, namely through the consumer research, assessed consumer preferences in the Czech Repulic and is also evaluated the hypothesis of potential benefits of Apple contactless payments.

The master’s thesis describes hardware opto-electronic instruments for contactless measurement of surfaces. It concentrates on instruments used for opto-electrical transformation of a taking scene and software processing of digital pictures. It presents selected methods of pre-processing, segmenting and following final modifications of these pictures. Then it deals with measuring of areas of surfaces and sizes of selected objects in these pictures and conversion of results from pixels to SI system of units. Possible divergences of measuring are described as well. A flow chart of a program for automatic and manual measuring of surfaces and sizes of objects in a picture, which is commented in detail, is a part of the thesis. The main product of this thesis is application Merovo, which provides measuring of an area and proportions of included objects. This application is analysed and described in detail in this thesis.

This work inkluse measurement principles for measuring liquid level in tanks with a focus on fuel. Are described most frequently used types of liquid level sensors, focusing on fuel. The work inkluse design chosen technical solutions fuel level sensor and its technical implementation, including the technical implementation and verification of its functionality and calibration.