National Repository of Grey Literature 36 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Censorship by the Federal office for Print and Information between 1980-1989
Kazda, Tomáš ; Končelík, Jakub (advisor) ; Köpplová, Barbara (referee)
anglicky The first part of the bachelor thesis aims to give its readers an idea how the Federální úřad pro tisk a informace, which supervised the Czechoslovak media infrastructure between 1981 and 1990, worked. Based on the synthesis of the archive materials from the National Archives and National Library of the Czech Republic, the thesis observes and explains the roles of each of its divisions. It situates Federální úřad pro tisk a informace in the historical context of previous censorship organizations and clarifies its position as the implementer of indirect censorship. The second part of the bachelor thesis focuses on the publishing of the periodical Informační týdeník. Using archive materials (primarily the minutes from the editorial boards) and the testimony of the editor Darina Sedláčková, the thesis puts together a picture of the periodical's purpose and presents essential information for understanding of its work. It tracks its contributions to the particular mass media editorial offices, observes the evolution of Informační týdeník over time and explains potential changes in its content. An interview with one of the editors uncovers the inner structure of Informační týdeník and daily routine of the editor in detail. Also, it presents necessary details for understanding Informační týdeník...
Design of sheet bender
Kazda, Tomáš ; Tůma, Jiří (referee) ; Pavlík, Jan (advisor)
This bachelor’s thesis deals with the design of a sheet metal bending machine, which is intended for home workshops, or common craft operations. The first part of the thesis contains a overview of similar machines, that are currently available in the shops. In the second part of the thesis was selected the most optimal design, which arose from the three conceptual designs. Each design was rated and on the basis of a multi-criteria analysis were selected the best one. Final design were processed to the 3D model, which have a technical calculations and technical drawings too. After this were made a economic calculations of a final design, including a comparison with a selected models from the research part of this thesis.
Study of intercalation properties of negative electrode materials
Minda, Jozef ; Kazda, Tomáš (referee) ; Libich, Jiří (advisor)
The bachelor thesis deals with the research of intercalating properties of negative electrode materials for lithium-ion and sodium-ion accumulators. The main focus of this work is on the kinetic aspects associated with the diffusion processes of lithium in graphitic negative electrode material and sodium in titanates materials in relation to the electrochemical parameters. By comparing the materials in terms of kinetic properties expressed by the diffusion coefficient with using of electrochemical impedance spectroscopy in the state of the base material and after creating the passive layer on the electrode, it is possible to determine the application possibilities of the materials and the dependence on the electrochemical parameters. In the thesis is designed a procedure for electrodes preparation, measurement and evaluation of monitored parameters. Within the experimental part, the structural and electrochemical parameters and diffusion coefficients of the studied materials are determined by the proposed method.
Study of properties of electrode materials for advanced lithium ion systems
Juránek, Dominik ; Tichý, Jiří (referee) ; Kazda, Tomáš (advisor)
This bachelor thesis is involved in study high voltage material for positive electrode LiNi0,5Mn1,5O4. The first part of thesis is involved in theory around batteries and then Li-ion batterie, where there are described individual materials for positive electrodes. In the second part of theses is examined the material itself, which is doped by chrome, copper and molybdenum.
Study of electrode materials for post-lithium ion systems
Kekelák, Miroslav ; Jaššo, Kamil (referee) ; Kazda, Tomáš (advisor)
This bachelor thesis deals with studying electrode materials for post-lithium ion systems. The theoretical part describes the principle, history and construction of lithium-ion battery cells. A separate chapter is dedicated to the materials of positive and negative electrodes for lithium-ion batteries. The third chapter is dedicated to the principles of new generation lithium-air and sodium-ion batteries. The last chapter of theoretical part is dedicated to lithium-sulfur batteries, which describes their principle, history, used electrode materials and the influence of binders. The experimental part is dedicated to the preparation of the electrode material of lithium-sulfur accumulator in combination with water-soluble binders and their measurement using electrochemical methods.
Study of life cycle of the accumulators
Babieska, Lukáš ; Binar, Tomáš (referee) ; Kazda, Tomáš (advisor)
This bachelor work deals with monitoring the life cycle of a lithium-ion battery. The theoretical part describes the history and development of electrochemical cells. Lithium-ion batteries are a separate chapter. There are described their principles, the most used materials for the production of negative and positive electrodes, loading characteristics and the influence of temperature. In the practical part, the influence of temperature on changes of internal impedance, cell capacity and efficiency of energy supply during the battery life cycle is monitored.
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.
Study of the possibility of using Tesla's turbine as a source of energy
Šedina, Martin ; Maxa, Jiří (referee) ; Kazda, Tomáš (advisor)
The master thesis deals with the currently used types of water turbines and next part of the thesis deals with the theory of Tesla turbine. The theoretical part discusses water wheels, water turbines with their types and models which are described in the work. The thesis also discusses the construction of the Tesla turbine, its possibilities of using, inside principles and information about Tesla´s patent. The practical part contains the design of the Tesla turbine with modifications for increasing efficiency. The thesis describes production and assembly of turbine and the technology used for production of the turbine. There is also described how the turbine was measured and there are results of measurements of the turbine.
Synthesis and characterization of sulfurized polymers for electrochemical power sources
Svoboda, Lukáš ; Kazda, Tomáš (referee) ; Čech, Ondřej (advisor)
Batteries based on lithium-sulfur technology have the potential to increase the amount of stored energy in comparison with current lithium-ion systems while maintaining the same weight. Achieving this goal is possible due to the high theoretical energy density of sulfur, which exceeds the values of other materials used in batteries. However, these batteries suffer from several failing, which still hinder the practical use. The use of amorphous sulfur instead of its crystalline form might lead to increasing of durability and charge efficiency. Inverse vulcanization of sulfur seems to be the perspective method for the preparation of polymer sulfur because it prevents its recrystallization and stabilizes amorphous sulfur. The aim of this thesis is the preparation and study of properties of materials made of inverse vulcanized sulfur.
Study of the influence of the used separator on the electrochemical properties of the accumulator
Řehák, Petr ; Karmazínová, Kateřina (referee) ; Kazda, Tomáš (advisor)
This bachelor thesis deals with the historical development and the current issue of Li-ion accumulators, especially the separators. In the theoretical part is described history of batteries, their distribution and materials for the positive electrode of Li-ion accumulators. In the practical part, several samples with different types of separators were created and their properties were measured using electrochemical methods. Then the samples were compared with each other.

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