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An effect of natural phenomena on electrical devices
Müller, Michal ; Aubrecht, Vladimír (referee) ; Bušov, Bohuslav (advisor)
The Thesis deals with the impact of natural effects on electrical equipment. It describes the various natural effects and shows how it impacts, what it impacts on and what the source of its impact is. The main point of this Thesis is the issue of atmospheric charge (storm and lightning) and the issue of coronal mass ejection (CME). The Thesis shows causally consequences string of geomagnetical field disturbances and resultant power system impacts. There are mentioned historic storm events and power system impacts and description of events in Hydro-Quebec – the most important event. Of this species. At the end there are shows possible way of mitigation power system impacts.
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Simulation of electric field in the area of switchgear busbars
Müller, Michal ; Janda, Marcel (referee) ; Bušov, Bohuslav (advisor)
The aim of this work is to simulate the electric field in the space of busbar HV switchgear. More precisely, the aim is to find a place with the most critical value of the electric field, the design of measures to reduce the size of the field at this point. The simulation was performed using the finite element method program. The simulation found the most critical area. Using the basic physical principles it has been proposed solution. This solution reduced twice the magnitude the electric field in this area.
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Electrically short multiband antenna for radioamateur use
Müller, Marek ; Šebesta, Jan (referee) ; Lukeš, Zbyněk (advisor)
The purpose of this work is identification with theory of EH antennas, do the simulation of one choice of model of EH antenna from literature and this model optimise on required frequency 14 MHz through the use of computer software CST Microwave Studio. The practical part of work is to produce choice model of EH antenna, to mete his properties and to verify use in real traffic. The EH antenna is an electromagnetic electrically short antenna, which can work as a transmitting or receiving antenna. The main characteristic of EH antenna is distributed radiating electromagnetic field, whose electric component E and magnetic component H are mutually crossed and orthogonal. The advantage of EH antennas is, that they have much smaller size on frequencies in order of magnitude MHz in comparison with conventional antennas (e.g. half-wave dipole). Their disavantages are their more complicated construction and tuning of the antenna, which must be made again, when the position of antenna is changed. Therefore the EH antenna is not so suitable for mobile application.
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Sanitation installations and gas installations in Preschool
Műller, Martin ; Vaščáková, Alena (referee) ; Vrána, Jakub (advisor)
The thesis deals with the technical and gas installation with the use of precipitation water in pre-school facilities. The theoretical part deals with fat traps. The experimental part is focused on water flows, pre-school facilities. In the design and calculation part are drafted sewerage, water supply, gas pipeline, use of rain water and connection of the building to utility networks. The thesis was elaborated according to current standards, laws and decrees
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Adaptor for the Group Delay Measuring
Müller, Marek ; Kratochvíl, Tomáš (referee) ; Říčný, Václav (advisor)
The purpose of this work is to propose the adaptor for the group delay measuring. This equipment would be worked as one special device, which it connects between wobble generator (for example wobbler X1-50) and measured circuit. This configuration can be measured not only the dependence of group delay on frequency at the measured circuit, but it can be measured even its amplitude - frequency characteristics. Whatever oscilloscope can be used for displaying of measured characteristics in the event of the application of other separate wobble generator, when the oscilloscope works in XY mode. The utilization of the equipment can be for example for the group delay measuring of intermediate frequency amplifiers by TV sets at frequency band since 30 MHz to 50 MHz. This equipment is able to measure the group delay time within the range since 0.56 ns to 2 s.
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Modification of material flow of the manufacturing supplies
Hloušek, David ; Müller, Martin (referee) ; Kašpárek, Jaroslav (advisor)
The main content of this thesis is analysis and proposal of supplying between storages in company Hella Autotechnik Nova in Mohelnice. The main content of creation of this company is wide sort of front headlamps, rear and break lights, but also there is some sort of its washers for the most famous cars brands. Otherwise this thesis is about modification of basic layout, what can be seen there nowadays between external storage Meriva and logistic centre, what is located in main building of this company.
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Division of the region of the Šumava/Böhmerwald Mts. in terms of heavy precipitation
Králová, Kateřina ; Müller, Miloslav (advisor) ; Šobr, Miroslav (referee)
Divison of the region of the Šumava/Böhmerwald Mts. in terms of heavy precipitation Abstract This thesis deals with the spatial and temporal distribution of heavy precipitation in the Šumava region. The first part of the work is devoted to literature review regarding precipitation conditions in mountainous areas and a brief description of the Šumava mountains. The second part is initially devoted to the analysis of a total of 683 heavy precipitation events at the 64 stations spread evenly between Czechia, Germany, and Austria. The 50 largest daily precipitation totals at individual stations in the period 1971-2018 were always selected as strong precipitation events. The analysis was focused on the seasonal division of these events into four periods, namely spring, summer, autumn, and winter. Here, a strong link between the winter period and the westerly flow and the summer period and circulation types B, Bp, SWc and C is shown, and it is also confirmed here that spring and autumn are rather transition periods between the warm and cold part of the year with regard to heavy precipitation. Furthermore, an analysis of strong precipitation events was conducted based on the location of the geographical midpoint of the Tu event in quadrants I-IV, which were defined using the created vector space. I. and IV....
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Design precipitation in Czech river basins
Müller, Miloslav ; Kašpar, Marek ; Hulec, Filip
Data on rainfall intensity on the territory of the Czech Republic with a horizontal resolution of 1 km2 and a time step of 10 minutes, obtained by adjusting radar estimates with data from rain gauge stations, were used to derive design areal precipitation in the Czech river basins of 1st to 4th order and in the basins of surface water bodies. When the rainfall accumulation time is doubled, the design precipitation total in individual pixels increases by about 20% on average. The magnitude of the design totals decreases with increasing catchment area, especially for shorter accumulation periods.
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