|
|
Voltage transformer
Kovařík, Martin ; Huzlík, Rostislav (referee) ; Ondrůšek, Čestmír (advisor)
This bachelor´s thesis focuses on the elements of equivalent circuit parameters of voltage instrument transformer TJC 7-G from the portfolio of ABB. Main focus is placed on correct identification of the leakage reactance of primary and secondary winding, which are used for correct settlement of protections. The measurement is done by using methods of measurement of transformer without load and with short circuited secondary terminal. The values are measured for different frequency levels, in order to determine precisely all the parameters. The theoretical part describes the use of instrument transformers, theoretical creation of equivalent circuit and parameters which affects the accuracy class. The conclusion contains the evaluation of different methods for determining the elements of the equivalent circuit and with its final assembly.
|
|
| |
|
|
Characterization of electronic properties of nanowires for electrochemistry
Kovařík, Martin ; Čech, Vladimír (referee) ; Kolíbal, Miroslav (advisor)
Elektrochemické metody nacházejí využití v mnoha aplikacích (např. senzorice, skladování el. energie nebo katalýze). Jejich nespornou výhodou je nízká finanční náročnost na přístrojové vybavení. Abychom lépe porozuměli procesům probíhajícím na elektrodách, je dobré znát elektronickou pásovou strukturu materiálu elektrody. Úkolem této práce je vyhodnotit výstupní práci a pozici hrany valenčního pásu nových materiálů pro elektrody, konkrétně cínem dopovaného oxidu india pokrytého nanotrubicemi sulfidu wolframičitého. Ultrafialová fotoelektronová spektroskopie a Kelvinova silová mikroskopie jsou metody použité pro tuto analýzu. Zvláštní důraz je kladen na přípravu vzorků elektrod pro měření, aby nedošlo k nesprávné interpretaci výsledků vlivem vnějších efektů jako je např. kontaminace nebo modifikace povrchu.
|
|
|
Merging Tasks with Non-Interfering Requests for the System Baker
Kovařík, Michal ; Fiedor, Jan (referee) ; Holík, Lukáš (advisor)
The goal of this thesis is to design a format for entering parameters and requirements of individual tasks intended for the Beaker system and to design a program that merges tasks defined upon input based on elimination of possible collision requirements into collection of tasks that can be run together. The output format should be acceptable by the Beaker system. The thesis describes installation of the operating system on which collision requirements are defined. The thesis describes how to specify and run tasks in the Beaker system. The results of the program testing are shown in the thesis' conclusion.
|
|
|
Analysis of one-dimensional structures using Kelvin Probe Force Microscopy
Kovařík, Martin ; Bartošík, Miroslav (referee) ; Kolíbal, Miroslav (advisor)
This bachelor's thesis deals with the use of Kelvin probe force microscopy (KPFM) for analysis of 1D nanostructures, namely germanium nanowires and tungsten disulfide (WS2) nanotubes. First part of this thesis is dedicated to the possibility of gold nanoparticles detection on germanium nanowires and also to the analysis of relevance of the KPFM method to measurements performed at various humidity. Second part deals with the measurement of surface potential changes on WS2 nanotubes induced by interaction with light. We have concluded, that relative surface potential changes can be measured at various humidity. This conclusion is also applied to study the interaction of WS2 nanotubes with monochromatic light. The experiment has revealed, that when exposed to light with defined wavelength, nanotubes coated with gold nanoparticles show opposite surface-potential changes as compared to pristine nanotubes, which indicates different physical processes under way.
|
|
|
Anthropometric research of the adult population and its applications in interiors and architecture
Kovařík, Martin ; Petelen, Ivan (referee) ; Hronský, Michal (referee) ; Doc.Ing.Veronika Kotradyová,PhD. (referee) ; Šindlar, Jiljí (advisor)
This thesis focuses on research in the field of anthropometric measurements of the adult population, its history, basic concepts and research itself, conducted under the author’s leadership of the NIS project at the Mendel University in Brno. The research results and its application in the field of interiors and furniture should be used to revise the architectural patterns and standards dealing with the relations on the axis between man – interior – furniture. It describes the relations of individual parameters, a person's height and weight, their development depending on age and sex, compares the height curve growth in Czech population and in Europe. The results of the work should serve as a basis for revising the existing typological principles and standards with regard to new results; in conclusion the author proposes conceptual changes of the fixed schemes in relations of man and interior.
|
|
|
Measurement and checking of dimensions in grinding operations
Kovařík, Michael ; Varhaník, Matúš (referee) ; Trčka, Tomáš (advisor)
The bachelor thesis deals with the topic measurement and checking of dimensions in grinding operations. To introduce the issue there is in the introductory part of the work a brief characteristic and distribution of particular finishing operations. Emphasis is put on grinding that is the main subject of this work. In connection with grinding there are mentioned mainly basic abrasive materials and achieved parameters of ground surface. Then the work focuses on measuring instruments that are used for evaluating surface structure, gauges that are used for measuring and controling longitudinal dimensions and on basic distribution and description of chosen jigs. In another part are introduced conditions for operator qualifications in the are of grinding technology. In conclusion of this work is chosen a component on which is applicated chosen grinding, the solution is analytical. After it follows evaluation.
|
|
| |
|
| |
|
| |
guest ::
RSS feed.