National Repository of Grey Literature 77 records found  beginprevious31 - 40nextend  jump to record: Search took 0.01 seconds. 
Optical transmission applications in industries
Worbis, Vít ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
The aim of the semestral work term use of optical transmission in the industry is to find the right equipment for communication in industrial applications, which would lead to better control and management of these applications. My show almost seamless connection between the device, which is controlled by another device such as a computer. The first chapter shows how inside the core optical fiber and reflected beams are then carried around the skylight. The second section lists the differences between the copper and fiber cabling, there is described why metallic line slowly destroyed and replaced him fully optics. In the third chapter, I focused on the optical fiber, what are its characteristics, from which parts are made and what is distributed. In the fourth part shows the optical transmitters for multimode and singlemode optical fibers, which are differences between them, which are produced and with what characteristics, etc. In the fifth chapter is applied to a network of possible involvement in the industrial zone, is designed only as they could theoretically be industrial zone controlled by the machine. In the sixth part of the thesis I have tried to design a laboratory task that consists of those optical converters. It is only a small sample, as used in the industry far more extensive involvement.
The behaviour of ferroelectrics in the temperature range
Czanadi, Jindřich ; Polsterová, Helena (referee) ; Rozsívalová, Zdenka (advisor)
The submitted thesis describes characteristics and use of the ferroelectric material which has their utilization in electronics and electro technical industry. The thesis describes behaviour ferroelectrics in temperature range. A suitable workplace was designed and its functionality was verified in selected ferroelectrics samples dependence of temperature of components of complex permittivity.
Dielectric Absorption of Electroinsulating Materials
Pavlinský, Branislav ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor)
This bachelor thesis deals with the basic physical principles of dielectrics as well as the description of the phenomenon of dielectric absorption. The work presents diagnostic methods that use this phenomenon, based on the events taking place in the dielectric after the connection of DC voltage. Furthermore, the work deals with diagnostic methods for determining the state of insulation of various high-voltage electrical equipment. The work also deals with the properties and parameters of electrical insulating materials - specifically polymers. We obtain these parameters using the mentioned diagnostic methods. By knowing these parameters, we achieve enough information about the insulation to determine its condition and prevent possible damage.
Dielectric Properties of Epoxy with Ground Mica
Bednář, Pavel ; Polsterová, Helena (referee) ; Havlíček, Svatopluk (advisor)
This thesis deals with the dielectric relaxation spectroscopy applied to samples of an epoxy slip filled by grounded mica with granularity of 40 m. The changes of dielectric properties were investigated depending on the fulfillment of grounded mica, temperature, the relative air humidity, and the frequency between 100 Hz and 1MHz.
The application of electrical discharge sinking at technology of production of indexable insert cemented carbide
Gábor, Radek ; Prokop, Jaroslav (referee) ; Osička, Karel (advisor)
This diploma thesis view to problem electrical discharge sinking. Forth with deal production of indexable insert cemented carbide and application electrical discharge sinking at this technology.
Electrical Discharge Machining of Materials for Cutting Tools with Focus on Manufacturing Process Optimization
Nováková, Radana ; Šurda, Adam (referee) ; Slaný, Martin (advisor)
This bachelor thesis describes and deals with the electro discharge machining, with a focus on optimizing the production process. In particular points to the factors influencing the course of machining.
Porous-alumina-assisted formation of metal and metal-oxide nanostructures for use in advanced micro-devices
Kamnev, Kirill ; Mardare, Andrei Ionut (referee) ; Blanchar, Xavier Correig (referee) ; Mozalev, Alexander (advisor)
Anodizace kovů přes masku porézní anodické aluminy (PAA) je použita namísto nanoporézní anodizace nebo tradičních nanofabrikačních metod na výrobu nových nanostrukturovaných oxidů kovů se zdokonalenými parametry. Vylepšování vlastností oxidů ZrO2 a HfO2 nanostrukturováním vzbuzuje podstatný zájem kvůli aktivní komercionalizaci těchto oxidů kovů. Nanostrukturování ZrO2 a HfO2 anodizací je náročné kvůli včasné krystalizaci anodického oxidu a téměř nulovému transportnímu číslu kationtů. Tyto problémy jsou řešeny systematickým zkoumáním anodického chování dvouvrstev složených z tenké vrstvy Al nadeponované na vrstvě Zr nebo Hf. Po prvý krát je dosažen reprodukovatelný růst ZrO2 nanostruktur přes masku PAA, které plní póry PAA masky jenom částečně. Tyto vnořené ZrO2 nanostruktury se projevují zlepšeným dielektrickým výkonem v širokém rozsahu frekvencí s nízkými zbytkovými proudy a vysokými hodnotami průrazného napětí. Tyto vlastnosti z nich dělají atraktivní struktury pro použití v mokrých a hybridních elektrolytických kondenzátorech. Vrstvy s rovným povrchem, kompatibilní se standardními metodami nanofabrikace a obsahující ZrO2 nanostruktury kompletně plnící póry PAA masky, jsou syntetizovány kombinací anodizace přes masku PAA s částečným rozpuštěním PAA. Tyto vrstvy jsou použity v experimentálních MIM mikrokondenzátorech, které vykazují nízké zbytkové proudy, vysoké hodnoty průrazného napětí, vysoké hustoty energie, nízké hodnoty teplotního koeficientu kapacity a výbornou linearitu mezi kapacitou a napětím, což z nich dělá dokonalé kandidáty pro pasivní integraci zařízení na čipu. ZrO2 nanovrstvy připraveny anodizací přes masku PAA jsou, po prvý krát, schváleny k produkci osteogenních biokeramických povlaků. Tyto nanostrukturované biokeramické ZrO2 povlaky mohou modulovat interakce mezi buňkami a povrchem a zvyšovat mineralizaci osteoblastů 5 krát oproti rovné anodické ZrO2 vrstvě. Nanostrukturované HfO2 vrstvy připraveny anodizací přes masku PAA vykazují opakovatelné nízkovýkonové bipolární rezistivní spínání, což je dělá význačnými jako tuhé elektrolyty pro aplikace v memristorech. Anodizace Hf přes masku PAA v kombinaci s vhodnými chemickými modifikacemi povrchů je použita po prvý krát k vytvoření samouspořádaných nanostrukturovaných HfO2 povlaků, které jsou superhydrofóbní, odpuzují olej, jsou transparentní pro viditelné světlo a antireflexní, což je dělá velmi vhodnými pro pasivaci fotovoltaických zařízení.
Issue Of Measuring Parameters Of Dielectric Materials
Pelikán, Luděk
This article deals with the problems arising in the electrical measurement of various dielectricmaterials used in power engineering. The article presents the basic quantities and theirmeasurement principles. It focuses mainly on parameters measurable in non-destructive measurements,such as volume resistivity, relative permittivity, and dissipation factor. The article draws attentionto the problems that may arise during the measurement and thus guides the reader on howto measure these parameters correctly. These problems and findings were gathered during severaldifferent measurements with different types of dielectrics.
Design of placing high voltage electrodes of the projection set of electron microscope on insulating rods
Pavlas, Ondřej ; Musil, Vladislav (referee) ; Hejátková, Edita (advisor)
In it´s first part, this presented master´s thesis focuses on the problematics of actions taking place in dielectric materials and phenomenons on the surface of real insulators placed in electric field. This research is followed by selection and rating of appropriate ceramic materials for the actual design of the metal – ceramic assembly. The greatest emphasis is given to design of the optimal configuration of the insulator and electrode, which is supported by simulations from the software that implements finite element method. Eventually, the high voltage tests of the assembly used for measuring leakage currents are performed.
Comparison Of Measuring Instruments Designed To Electrical Properties Analysis Of Epoxy Resins With Different Fillers
Horák, Luděk
Presented thesis is focused on studying electroinsulating epoxy resin-based sealings. It describes the chemical composition, production, properties and measuring methods of basic electric quantities of these materials. The aim of the thesis is to compare several sets of samples of composite epoxy resins with different kinds of micro-ground siliceous sand as a filling. The temperature and frequency dependence of relative permittivity, dissipation factor and volume resistivity are measured for given samples.

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