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Influence of plasma activated water on seed germination and quality of corn
Kovařík, Martin ; Zlámalová Gargošová, Helena (referee) ; Kozáková, Zdenka (advisor)
The bachelor's thesis deals with the effect of plasma-activated water on corn germination. After water comes into contact with plasma, the water changes its chemical composition and thus, it acquires new properties that can be used in agriculture. The theoretical part is divided into two basic parts. At the beginning of the first part, plasma is briefly characterized, and then this part deals with plasma-activated water, its formation, physical and chemical properties, and at the end of this part, its use. The second part of the theoretical part is devoted to the germination of plants, external influences affecting germination and statistical evaluation of germination. At the end of the theoretical part, this thesis deals with the ecotoxicity of plants. The content of the experimental part was the preparation of PAW, its subsequent application to corn seeds and the study of its effect on germination and plant quality. PAW was created from distilled or tap water using three different plasma systems and the effect of each PAW on the seeds was compared with that of each control sample. The obtained results indicate a positive effect of PAW on seed germination, but the final hypothesis would require more extensive experiments in different environments, especially in soil.
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Creating a VPN Access Point on Raspberry Pi
Kovařík, Martin ; Hájek, Jaroslav (referee) ; Benedikt, Jan (advisor)
This bachelor thesis deals with creating a virtual private network (VPN) access point on a single-board Raspberry Pi computer. The theoretical part describes the principle of VPN, the most common tunneling protocols and the Raspberry Pi computer in general with its various generations and models. Selected protocols are implemented on the Raspberry Pi and their hardware load, response and throughput are measured. The stability of the protocols is tested and reliability evaluated.
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Coilgun
Kovařík, Martin ; Pavlík, Michal (referee) ; Šteffan, Pavel (advisor)
This bachelor’s thesis describes the design and construction of electromagnetic gun for testing projectiles from different ferromagnetic materials with maximal power 19 J. Conventional projectile propulsion mechanisms include the use of compressed air or explosion which places theoretical limits on the maximum muzzle velocity limited by laws of thermodynamics. The electromagnetic coil gun, explores the use of electromagnetism in accelerating projectiles which offers a much higher theoretical limit on muzzle velocity. In addition of an electromagnetic acceleration is possible to regulate output velocity/energy of projectile, and acceleration applied on projectile.
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Antispam software plugin for e-mail filtering based on geolocation of the sender
Kovařík, Martin ; Komosný, Dan (referee) ; Caha, Tomáš (advisor)
This thesis deals with the creation of a module for antispam software providing email filtering using sender geolocation. The theoretical part of the thesis describes spam in general and the threats that spread through email communication, such as social engineering and malware. Then the principle of email and email headers, email filters and their methods to filter messages are described and lastly IP geolocation and machine location methods are described.The created filtering module Geolock was designed for the SpamAssassin antispam software and uses the IP2Location geolocation database. The embedding of the module into SpamAssassin is shown and the module itself and its different parts are described. The module is tested on a dataset and a real-life application is outlined. The Geolock module is published on GitHub under the MIT license (https://github.com/MartinKovarik/Geolock).
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Magnetic separator for recycling construction and demolition waste
Kovařík, Martin ; Zeizinger, Lukáš (referee) ; Škopán, Miroslav (advisor)
This work contains a search of available equipment for the separation of ferromagnetic material and the design of a specific design solution of a magnetic separator for the recycling of ferromagnetic waste from construction and demolition waste. According to the entered parameters, the calculations necessary for the correct design of the machine were performed. Part of the work is drawing documentation of selected parts and assemblies of the device.
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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.
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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.
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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.
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