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Design and implementation of TEM cell
Bednarský, Vojtěch ; Růžek, Václav (referee) ; Dřínovský, Jiří (advisor)
The purpose is to design and make a TEM cell, which may often be referred to in publications as a Crawford chamber, after the inventor. The operating frequency is specified from 100 kHz to 400 MHz and is suitable for a test device of maximum size (0,3(l) x 0,3(w) x 0,1(h)) meters. I will first describe the basic methods of electromagnetic susceptibility testing, and electromagnetic interference measurements, and then mention the issues and motivations for the fabrication of the closed TEM cell. Computer simulations were performed in the numerical computing software CST Microwave Studio. The calculated dimensions were used as a starting point for simulation. Dimensions from the simulation were used for the fabrication of the closed TEM cell, which showed similar results as the results of the simulations.
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Language and content integration models in ELT
Synková, Blanka ; Gráf, Tomáš (advisor) ; Klégr, Aleš (referee)
The thesis focuses on the topic of language and content integration in ELT in a broad sense, i.e. it discusses not only CLIL but also other models of content-based teaching, viz. ESP (English for Specific Purposes), EAP (English for Academic Purposes), and EMI (English-medium Instruction). In the theoretical part of the thesis, these models are described as regards their history, typical features, teachers, learners, as well as benefits and negatives. The empirical part of the thesis explores the current practice of language and content integration at Czech general secondary schools ("grammar schools"). The research is based on case studies of five teachers who teach various courses belonging to this category. The preliminary research investigated what courses are currently being offered at grammar schools in Prague; they are mostly elective courses. Our research findings suggest that language and content integration in the form of elective courses is a rather common practice, although often unconscious. Teachers tend to act on the basis of their intuition rather than their knowledge of theory and practice of language and content integration. Generally, it seems that more emphasis is put on content than language in these lessons. Content-based English lessons may be beneficial for learners for...
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Antenna Preamplifier For Emi Measurements
Sedlák, Milan
The contribution deals with the design of a low-noise amplifier with frequency band from 30 MHz to 1 GHz, usable for measuring and testing electromagnetic interferences in EMC test room. The main task of the low-noise amplifier is to improve sensitivity of the measurement chain which allows measurement of the undesired emission of high frequency signals at a very low power level.
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Language and content integration models in ELT
Synková, Blanka ; Gráf, Tomáš (advisor) ; Klégr, Aleš (referee)
The thesis focuses on the topic of language and content integration in ELT in a broad sense, i.e. it discusses not only CLIL but also other models of content-based teaching, viz. ESP (English for Specific Purposes), EAP (English for Academic Purposes), and EMI (English-medium Instruction). In the theoretical part of the thesis, these models are described as regards their history, typical features, teachers, learners, as well as benefits and negatives. The empirical part of the thesis explores the current practice of language and content integration at Czech general secondary schools ("grammar schools"). The research is based on case studies of five teachers who teach various courses belonging to this category. The preliminary research investigated what courses are currently being offered at grammar schools in Prague; they are mostly elective courses. Our research findings suggest that language and content integration in the form of elective courses is a rather common practice, although often unconscious. Teachers tend to act on the basis of their intuition rather than their knowledge of theory and practice of language and content integration. Generally, it seems that more emphasis is put on content than language in these lessons. Content-based English lessons may be beneficial for learners for...
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Electromagnetic compatibilty
Šimoník, Martin ; Hoder, Karel (referee) ; Havlíková, Marie (advisor)
This bachelor is focused on a problem field of electronic compabiliti as the technical side as same as biological side of it. This Thesis describes the basic concepts of EMC and also analyzis each legislative requirements and regulations of EMC. One part of this thesis include designing a test procedur for verifcation of EMC pressure measurement technology of BD SENSORS company and realization of it.
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Electromagnetic compatibility tests
Kolařík, Jan ; Hoder, Karel (referee) ; Havlíková, Marie (advisor)
The aim of this bachelor project is analysis problems branch of science EMC. The bachelor project contains basic distribution field and description individual parts of the field. Next bachelor project contains detailed description of individual measuring devices and equipment test room of EMC in company AEV s.r.o. like are signal generator, spectral analyzer and antennes. Last part of bachelor project deals with measurement electromagnetic interference on the product from the company AEV s.r.o. in accordance with the standard TL965 and design report of tests for a customer.
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Laboratory Switching Power Supply
Šneidr, Radim ; Petržela, Jiří (referee) ; Šebesta, Jiří (advisor)
The topic of my bachelor´s thesis is a solution to a laboratory switching power supply, look at their benefits, disadvantages and characteristics in terms of EMI. The aim this work is also to design the concept of two outputs switching supply with monolithic circuit, LM2576 with the inclusion of a current limiter and implementation of a test version which will use basic measuring. Further, design a general scheme and the mechanical solution of a power supply including measuring modules. Design layout of printed circuit, complemented with thorough testing.
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Ultra low noise switching power supply
Raba, Jaroslav ; Leuchter,, Jan (referee) ; Šrámek, Petr (advisor)
This thesis deals with the issue of switching power supply in terms of noise ratios in the output voltage. In the theoretical part analyzes the basic principle of classical and resonant topology switching power converters in terms of output voltage ripple and switching noise. There are also some possibilities of compensation to minimize switching noise and output ripple. The second part describes the custom design a low noise switching power supply, which is composed of an active power factor corrector, power converters and ripple limiter. The main power converter is designed as an LLC resonant converter. The last part deals with the actual construction of the proposed source, its measurement and presentation of the results.
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Interconnects modelling for signals transmission
Fabián, Martin ; Petržela, Jiří (referee) ; Brančík, Lubomír (advisor)
In this work, there is solution for problem about signal itegrity and problems that causes raising frequence in circuits and machineries. There is describe interconnect analysis of models, which enable transfer of signals in mixed analog – digital circuits and a different between the analyse of an time domain and an s-domain. Next, there are described three methods of the calculation homogenous transmission line.The first method is constructed on mathematic description of transmission line. The second method uses cascade connection and T networks to the simulation model of the homogenous transmission line. The last one is constructed on the moment matching in use of state variables. These methods uses numerical inversion of Laplace transforms and these methods are constructed in programming language Matlab. Its results with the confrontation is described in the ending.
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Electromagnetic interference and pacemakers
Kulík, Jindřich ; Richter, Miloslav (referee) ; Havlíková, Marie (advisor)
This thesis deals with electromagnetic compatibility of implantable electro-medical devices using in cardiology. The main aim of this thesis is detection of the resistance of implantable pacemakers (PM) and implantable cardioverter defibrillators (ICD) to the electromagnetic interference. In the first part of this thesis, a function of the heart, which is necessary for understanding of PM and ICD operation, is described. The function and construction of PM and ICD is detailed in the theoretical part as well. The next part is focused on the electromagnetic compatibility. The next part is description of the measurement method and the experimental arrangement used for practical experiments with electromagnetic resistance of PM and ICD.
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