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Delta type FDM 3D printer
Kanás, Michal ; Čudek, Pavel (referee) ; Jaššo, Kamil (advisor)
This thesis deals with the 3D printing technology. The primary aim was to design and testing of the delta 3D printer. Main frame of the printer has hexagonal geometry which leads to very good frame stability. 3D printer is using an Bigtreetech SKR mini E3 V3 motherboard with user-defined firmware Marlin 2.0.9. After completing the design and building the printer, there were series of accuracy tests done which shown that the accuracy of the printer is within ±0,1mm.
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Study of the ecological impact of production, operation and disposal of various types of cars
Raffay, Tobiáš ; Čudek, Pavel (referee) ; Jaššo, Kamil (advisor)
This master thesis focuses on the problem of the ecological impact of the production, use and disposal of vehicles. The theoretical part summarizes the necessary theoretical knowledge for an introduction to this issue. Thus, it focuses on the entire life cycle of a passenger vehicle and the emissions associated with it. The thesis deals with the greenhouse gases released during the whole life cycle of the vehicle. Thus, from the processing of materials, the production of passenger car parts, also in the production and combustion of fuel as well as in the disposal and recycling of the vehicle. The work compares the emissions of petrol, diesel, electric and hydrogen vehicles.
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Delta type FDM 3D printer
Kanás, Michal ; Čudek, Pavel (referee) ; Jaššo, Kamil (advisor)
This thesis deals with the 3D printing technology. The primary aim was to design and testing of the delta 3D printer. Main frame of the printer has hexagonal geometry which leads to very good frame stability. 3D printer is using an Bigtreetech SKR mini E3 V3 motherboard with user-defined firmware Marlin 2.0.9. After completing the design and building the printer, there were series of accuracy tests done which shown that the accuracy of the printer is within ±0,1mm.
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Sample preparation and their measurement by EDS methods
Kostelník, Tomáš ; Jaššo, Kamil (referee) ; Čudek, Pavel (advisor)
This bachelor´s thesis is focused on preparation and analysis of samples by energy dispersive spectroscopy using scanning electron microscopy. In the theoretical the main differences between environmental scanning electron microscopy and scanning electron microscopy are described. There is also a description of basic knowledge regarding energy dispersive spectroscopy. The generation and detection of signals arising from the interaction of a beam of primary electrons with a sample is also explained, with emphasis on the description, generation and distribution of these signals. The experimental part is focused on sample preparation and analysis.
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Design and construction of a simple music synthesizer
Ondryáš, Radek ; Čudek, Pavel (referee) ; Čech, Ondřej (advisor)
This paper deals with the topic of synthesizers. The first part of the paper provides a general description of synthesizers, their history, types, and important components. The next part of this paper focuses on sound generator chip Texas Instruments SN76477, specifically it’s functionality and ways of controlling its functions. The main part of this paper is designing and creating a synthesizer around the SN76477 sound chip and creating a box for the synthesizer from laser cut plywood.
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Determination of the chemical composition of a brass sample by X-ray fluorescence method
Tomanová, Michaela ; Čudek, Pavel (referee) ; Vaněk, Jiří (advisor)
The fluorescence spectroscopy method is used to distinguish components in gas, liquid, or solid samples. The study is based on the parameters of secondary radiation, which is emitted by each element and allows them to be identified. The distinction between each radiation is analogous to a fingerprint. Apart from quantitative and qualitative analyses, the method can be used to determine the thickness of metal layers and alloys. Laboratory analysis has a broader range of application than portable devices, which are also available. In the laboratory, two methods of measurement are available: wavelength dispersive fluorescence spectroscopy – WDXRF and energo dispersive fluorescence spectroscopy – EDXRF. A brass sample with lead additive was analyzed using EDXRF in the practical part of this diploma thesis. An X-ray apparatus from the Leybold company was employed for the analysis, which will be used for education of lower grades at the university. A measurement station and a laboratory assignment were developed as part of the thesis, the aim of which will be to determine the chemical composition of a brass sample using the X-ray fluorescence method.
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Electrical properties of the skin
Hellová, Miriam ; Čudek, Pavel (referee) ; Špinka, Jiří (advisor)
This work deals with the electrical properties of human skin, the possibilities of measuring its impedance, and the design of suitable electrodes for measurement. Various equivalent circuits for human skin were used, and phenomena that occur at the wet electrode-electrolyte interface, which significantly affect the measurement, were described. A description of the function of a dry planar electrode and its design for verification measurements were performed. Control measurements were performed using a EVAL-AD5933EBZ development kit in a frequency range of 5 kHz to 100 kHz at three different locations on the human body; the results were plotted in the form of the absolute value of the impedance and its phase. The accuracy of the measured values was verified by comparing the results with other works using a different electrode type. The main result of this work was to verify the possibility of using the geometry of a dry planar electrode in combination with an easily accessible evaluation board for simple diagnostic applications.
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Study of materials for the Li-ion batteries by electron microscopy
Hujňák, Jan ; Čudek, Pavel (referee) ; Kazda, Tomáš (advisor)
This work deals with problems of lithium-ion batteries. In the theoretical part are described electrochemical sources in general and their division. The main representatives of individual types of electrochemical sources are described in more detail. In the next part the thesis focuses specifically on lithium-ion accumulators, their history, electrochemical reactions taking place inside and materials of individual parts of which the accumulator consists. Next part focuses on electron microscopy and its division into scanning and transmission. Basic parts and the principle of operation are described. The practical part is focused on creating a small cell for examination under an electron microscope.
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Smoothing device for FDM 3D prints
Dubský, Jan ; Čudek, Pavel (referee) ; Bayer, Robert (advisor)
This bachelor’s thesis deals with a design of a device that would smooth out 3D prints, made of various materials, using FDM 3D printers. It explains the principle of 3D printing and describes technologies used in 3D printing. In this work is an overview of materials used for 3D printing and of some selected organic solvents. It describes methods of vapour smoothing and aerosol smoothing that can be used for smoothing out of 3D prints surface. The vapour smoothing method was experimentally tested using these solvents: acetone, dichloromethane, chloroform and tetrahydrofuran. The aerosol smoothing method used a solution of acetone and dichloromethane in the ratio of 1:1. Both methods were tested on samples made of PLA, ABS, PETG and SBS. This paper describes the design of a device for smoothing of 3D prints with regard to the chemical compatibility of used construction materials and ease of use of the device.
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Influence of working conditions on the results of EDS in ESEM
Pospíchal, David ; Čech, Ondřej (referee) ; Čudek, Pavel (advisor)
The bachelor thesis deals with energy dispersion spectroscopy and detection of characteristic X-rays in the field of environmental scanning electron microscope. The aim of the semester work is to compare the results of elemental microanalysis of samples under optimal conditions and to monitor changes of results, when changing working conditions, resp. nitrogen and water vapor pressure in the sample chamber of the scanning electron microscope Vega3 XMU with LaB6 cathode. TESCAN, a.s equipped with Xflash 6 | 10 spectrophotometer. Bruker
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