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Optimization of Basic Magnetic Field Homogeneity in MR Tomography
Hadinec, Michal ; Brančík, Lubomír (referee) ; Frollo, Ivan (referee) ; Bartušek, Karel (advisor)
This thesis is concerned with problems of measuring and mapping of magnetic field in MR tomograph, for purpose of magnetic flux density homogeneity optimization. Attention is paid to mapping techniques on rotary symmetric volume and to ways of magnetic fields optimization with utilization of passive and active correction systems. Theoretical analysis of magnetic field decomposition with utilization of spherical harmonics and numerical decomposition is made. Mapping and approximation techniques of basic magnetic field are verified by experiments in the laboratory at the Institute of Scientific Instruments AS CR in Brno.
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Complex lighting system
Šipr, Jan ; Hadinec, Michal (referee) ; Friedl, Martin (advisor)
This paper deals with the theoretical basic principles of lighting and regulation. On the basis of theoretical knowledge, there was task to design a lighting system tailored to your needs. Additionally, there is a communication protocols used in lighting technology DMX and ArtNet.
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Continuous conductivity measurement of produced copper wire
Kozáček, Peter ; Hadinec, Michal (referee) ; Klusáček, Stanislav (advisor)
My project is about possibilities of conductivity measurement of copper wire. I focus on basic principles of conductivity measurement and their applicability for continues measurement. Also I focus on proposing methods which would be the most appropriate for continuing measurement of conductivity. Each individual method is based on basic physic principles. I compare these measurement methods from different important industrial point of views in this project.
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Methods for localization of pulsed broadband signal source
Machala, Petr ; Hadinec, Michal (referee) ; Drexler, Petr (advisor)
The topic of this barchelor’s thesis is the analysis of problems regarding localization of partial discharges (PD) and related PD recording, processing and interpretation in time and frequency domain. In majority of cases the occurrence of partial discharges refers to a certain defect in the measured device, therefore in practice (eg large equipment such as oil transformers) it appears to be very useful and economical to determine the exact position, where PDs are formed. To address these complex issues, it is necessary to design the entire measuring chain from PD detection to measured data processing and localization itself. In terms of data processing and PD localization many different localization and detection methods can be applied, some of them are presented in this documentation. These methods are gradually studied, implemented and afterwards tested using the input data of the experiment.
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Guitar processor
Novák, Jakub ; Hadinec, Michal (referee) ; Friedl, Martin (advisor)
Analog effects are an integral part of modern musician. Advancing time makes players change and create new sounds emanating from the sound system. Unfortunately, it is not possible with one effect, but necessary to connect a combination of selected and appropriate effects. With the coming of digital multi-effect, in compared with an older analog effects, the quantity of sound effects increased, on the other hand, the quality decreased. This bachelor thesis, guitar processor, links the quality of analog effects with simple operation via microprocessor. Turn several effects at once is certainly great advantage. In comparison with the original analog equipment, which consists of several individual units, the project offers connection of selected effects in one unit. The processor saves not only time but also space.
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Design and construction of dual Crawford chamber
Haloda, Jiří ; Hadinec, Michal (referee) ; Szabó, Zoltán (advisor)
Dual Crawford cell is also known as dual TEM-cell (Transversal Electromagnetic Mode cell). It is device used for electromagnetic compatibility measurement (emission and immunity) and for biological application. This papers is focused on usage and design dual Crawford chamber and measuring of their electromagnetic compatibility. There are shown their advantages and disadvantages. This type of cell is simple for design and for the construction too. Construction of dual Crawford chamber with characteristic impedance of 50? for measure in 1GHz range was calculated.
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Control unit for heat pump
Kada, Tomáš ; Friedl, Martin (referee) ; Hadinec, Michal (advisor)
This bachelor’s thesis is interested in optimal regulation of air-water heat pump for heating the family house. The emphasis is reach the maximum efficiency, lowest cost and longest life of heat pump. The regulation is carried out by microcontroller ATmega16, which receives data from several temperature sensors, real-time clock circuit and indoor unit with user interface. The regulation is divided into two parts – control of heat pump and circulation pump floating hot water to radiators.
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Time-frequency analysis
Tráge, David ; Hadinec, Michal (referee) ; Kubásek, Radek (advisor)
The aim of this bachelor`s thesis is to explore possibilities of solving time-, frequency analysis a their combination time-frequency analysis by different methods for example Fourier transform a Wavelet transform. Going through this project we will get know each transformation and we will make clear procedure of their solving and first of all their advantages and disadvantages in view of accuracy of frequention`s mark in time.
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Methods of weighting the magnetic resonance signal
Filla, David ; Kubásek, Radek (referee) ; Hadinec, Michal (advisor)
The objective of this project is introduction to the fundamental principle of magnetic resonance and to the basic measuring methods used in MR. There is also described how to set parameters of pulse sequences in different measuring methods to obtain an image weighted by relaxation T1, relaxation T2, diffusion and eventually proton density. In the experimental part, we have measured images of three samples (tomato, pepper and mandarin) by four methods (SE, GE, IRSE and IRFSE). For obtained measured images we have proceed phase correction, created T2 and T2* maps. Then we consider the images obtained in terms of quality and compare with each other.
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Mapping and homogenity correction of basic magnetic field in tomograph
Žůrek, Dalibor ; Kubásek, Radek (referee) ; Hadinec, Michal (advisor)
This work focuses on a search of available literature in the field of mapping the magnetic field and the degradation of the field gradients. Initially on introduction to basic concepts in the field of magnetic resonance imaging, which are important for understanding the problems and become familiar with the principles of measurement of magnetic fields on the selected surface. Furthermore, there are described two basic measurement techniques, magnetic resonance imaging. The work is analyzed the degradation patterns of magnetic field gradients using the Taylor series and spherical functions. The second part describes how to obtain readings in the tomograph, which together with the previous decomposition of the field then used to describe a numerical calculation of magnetic induction on the surface of a sphere. Values measured and calculated values are compared at the end.
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