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Aprotic electrolytes for supercapacitors
Musílek, Václav ; Knotek, Tomáš (referee) ; Dvořák, Petr (advisor)
This master´s thesis deals different types of the aprotic electrolytes for supercapacitors and investigates by impedance spectroscopy to conductivity and method cyclic voltametry to measure dimension potential windows. Used aprotic solvents: propylencarbonate, dimethylsulfoxide, N, N dimethylformamide, ethylencarbonate, dimethylcarbonate, diethylcarbonate and acetonitrile. In the aprotic solvents were appended salts: LiClO4, NaClO4, KClO4, LiBF4, LiPF6, TEABF4 and TMABF4. From these compounds were prepared solutions with the different molar concentrations.
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Fabrication and characterization of plasmonic nanostructures
Bačo, Ondřej ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
This bachelor thesis deals with fabrication and characterization of plasmonic nanostructures. Graphene on a doped silicon substrate with a 285 nm thick layer of silicon dioxide was used for fabrication of these structures. Graphene ribbons with width in the order of hundreds of nanometers were prepared using electron beam lithography (EBL) and reactive ion etching (RIE). Steps in fabrication process were monitored utilizing optical and atomic force microscopy (AFM). Prepared graphene nanostructures were characterized with scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FTIR).
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Properties of carbon materials for supercapacitors
Štorek, Ondřej ; Dvořák, Petr (referee) ; Sedlaříková, Marie (advisor)
The Master’s Thesis deals with supercapacitators based on principle of eletrical double layer. At the outset there is an explanation of supercapacitor working principal. We discussed advantages and disavantages supercapacitators compared with other related elements in electrotechnics. Materials based on carbon and their structure for production supercapacitators are described too. In next part of Thesis we mention different methods and techniques for the measurement and the evaluation of supercapacitators‘s capacities. Optimal materials for production supercapacitators are presented in conclusion.
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DC/DC converter 24 V / 320 V / 60 W for a back-up supply source with a galvanic separation
Dvořák, Petr ; Martiš, Jan (referee) ; Vorel, Pavel (advisor)
This bachelor‘s thesis deals with the design, dimensioning and realization of a DC/DC 24 V / 320 V converter with a output power of 60 W. In the first part there is a short description of the linear stabilizer and then the switching sources with their dismemberment. Based on that chapter, was selected the flyback converter. The second part deals with components design and description of the control circuit. At the end, the construction of the converter with the verification measurement records is shown.
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Dynamic electroneurostimulation and electrical properties of skin
Špeta, Marek ; Dvořák, Petr (referee) ; Špinka, Jiří (advisor)
The focus of this diploma thesis is on theoretical basics of dynamic electroneurostimulation, which is an effect of electrical signal on acupuncture points of skin. This technology is used in devices made by russian DiaDENS company. Practical part of this thesis covers design of human skin impedance model. Especially derivation from three-element Cole-Cole model. Elementary, there is design of equivalent circuit of constant phase element and its incorporation into circuit. Then this circuit is designed, simulated and produced. Resulting product is used as a load to measure the characteristics of the DiaDENS device.
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IPv6 Protocol Implementation Concept in Company
Dvořák, Petr ; Dolníček, Petr (referee) ; Ondrák, Viktor (advisor)
Diploma thesis is focused on IPv6 protocol implementation in real company´s enviroment. In the beginning we are introduced with theoretical knowledge about this protocol. After analysis of current state of XXX spol s r.o. we can use this knowledge in practical part of thesis for proposal of possible solutions including physical devices.
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Electron beam lithography on non-conductive substrates
Hovádková, Zuzana ; Šamořil, Tomáš (referee) ; Dvořák, Petr (advisor)
The expansion of electron beam lithography has been really fast during last years. It is mostly because its capability to create big structures with a fine resolution. This study focuses on electron beam lithography on non-conductive substrates, exactly on glass. The lithography on glass is mostly used in life sciences. Because of the transparence of the substrate and its non-toxicity it can be used for cell adhesion. In the experimental section there are shown and compared two techniques how to compensate the charge accumulated on the top of the surface.
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Optical properties of infrared plasmonic antennas fabricated by FIB technique
Biolek, Vladimír ; Dvořák, Petr (referee) ; Kvapil, Michal (advisor)
The bachelor thesis deals with plasmonic nanostructures for mid-infrared region of electromagnetic spectrum. In the first part, there are discussed theoretical description of electromagnetic field and description of properties of plasmonic nanostructures. Then the manufacturing methods of the plasmonic nanostructures for mid-infrared region of electromagnetic spectrum are discussed using focused ion beam, and measurement of these nanostructures are discussed using Fourier transform-infrared spectroscopy.
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Energy-efficient house for doctors and nurses in the city of Kroměříž.
Dvořák, Petr ; Blasinski, Petr (referee) ; Rubinová, Olga (advisor)
The aim of my thesis is to design the project documentation of an energy-efficient house for doctors and nurses, located near the hospital in Kroměříž. The work is divided into three parts. The first part focuses on the architectural and construction design of the building. The second part deals with the design of the technical equipment of the building and its layout. The third part deals with the design and comparison of different cooling sources. The building is a two-storey building with a flat, vegetated roof and its design is in the building permit stage. On the ground floor there is a bistro, a dining room with food preparation, technical rooms and 3 apartments. On the second floor there are 9 apartments and a lounge. In the middle of the building there is a circulation area with a staircase, a glass elevator and a large skylight that illuminates the whole area. Heating is provided by a gas condensing boiler. Ventilation is provided by three air handling units. A hybrid cooling system with heat recuperation from the refrigerant is designed. For partial electricity demand, 62 photovoltaic panels are installed on the roof of the building. The third part deals with the design of alternative cooling solutions for the building. Multi split, VRV and water cooling system with roof top chiller are proposed in addition to the already designed hybrid system. These four alternatives are compared with each other and the most suitable option is then designed.
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