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Relative humidity effects on the electrical properties of silicone ruber
Pušec, Daniel ; Polsterová, Helena (referee) ; Frk, Martin (advisor)
At the beginning, this master thesis briefly describes the principle of semiconductors. It states their types, methods of operation, fields of use, and it interprets the manner of semiconductor devices’ passivation. Then it introduces silicones, their properties and usage. Later on, this thesis summerize air humidity theory and materiál moisturing including mathematical interpretation. Next chapter is devoted to basics of dielectric materials’ behavior. And finally, the last part of this thesis estimates charakteristics of passivation materiál, Dow Corning HIPEC Q1-9205 silicone rubber.
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Automated verification of aircraft satellite antenna's targeting function
Hradílek, Ondřej ; Kohoutek, Michal (referee) ; Polsterová, Helena (advisor)
This diploma thesis provides an overview and basic principles of satellite communication systems. Further is description of specific aerial satellite communication system ARINC 791. The practical part includes proposals of the system for automated verification targeting functionality of an air satellite antenna, which has been carried out in Honeywell laboratory conditions. The selected implementation is realized and used for automated verification targeting functionality of an air satellite antenna. The results are graphically evaluated.
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Modeling and approximation of absorption phenomena in dielectric materials
Raška, Jiří ; Polsterová, Helena (referee) ; Frk, Martin (advisor)
This thesis focuses on the polarization effects, that go on in the dielectric materials. It deals with physical and mathematical description of absorption effects. An important part of the thesis is a program environment, that is made by using programming language C++, which might be used for illustrative graphical displaying of physical laws of absorption effects in dielectric materials and for control of meters used for absorption current in dielectric materials measurement. This program can compute selected material constants from measured absorption currents. The proram enviroment enables creation of measurement protocol according to the norm ČSN IEC 93.
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Optimization of projection activities in EPLAN ELECTRIC P8 software
Obšil, Martin ; Bastl, Jiří (referee) ; Polsterová, Helena (advisor)
The thesis deals with the optimization of project activities in the software EPLAN Electric P8. First part introduces electrotechnical software EPLAN, the basic functions, and explains the methodology of the work in the program environment. This is followed by an analysis of the state of the electrical documentation of the TAC 75 circular saw manufactured by Exactcut s. r. o., and the method of designing. The thesis is also focused on the individual problems that make barriers between the average and the high quality level of design and the ability to use the available features of the purchased software. Thereafter, individual optimization steps and partial methods of reaching aims are described. Part of the thesis is devoted to finding solutions for interconnection of two engineering branches, which are electric and fluid technologies and in the end are revealed expansion modules of software, which can be used to achieve a higher level of professional planning activity.
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Study of electric properties of composite
Bariš, Marián ; Havlíček, Svatopluk (referee) ; Polsterová, Helena (advisor)
The theme of this Bachelor's thesis is a problematics of composite materials. On a given samples of polyamide with a various weight filling of a milled mica were measured resistivity, permittivity and loss factor on a consequence of a temperature and filling. The chosen type was a filling with a milled mica in range from 0 to 40 of a weight percentage, temperatures were in range from 20 °C to 90 °C.
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System design of data collection for control system longitudinal dump coal
Skalský, Jakub ; Amsoft, Jiří Uherek, (referee) ; Polsterová, Helena (advisor)
The diploma dissertation deals with description and division of technologies of coal storage yards. A content of it is classification of individual storages thoroughly divided according to their feature. It introduces with measuring equipment used while solving diploma dissertation. Is incorporated herein by a description of the PLC including a description of each associated modules. Further there is clearly mentioned specification of needed data that is necessary to scan for control system of the storage. Within the diploma dissertation was created electrical system documentation data of collection control systems for longitudinal landfill with two universal machines.
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