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Metody stanovení iontů dusíku ve vodě - stabilita výsledných hodnot
Musilová, Barbora
This thesis deals with nitrogen ions, i. e. nitrite and ammonia nitrogen in samples of natural waters and the stability of the resulting values. The theoretical part includes list of determination methods of nitrogen in aquatic environment. The practical part contains results of nitrogen ions concentration in chosen water samples and in standards. The aim of this thesis is to evaluate the impact of conservation reagents used to determine nitrogen ions on the final value and changes in these resulting values in a time depending on the analysis. Selected determination of nitrogen ions in natural water samples were performed from June 2014 to April 2015. Consequently the values were graphically processed and evaluated. A conservation reagent affects the resulting values only for the determination of ammonium ions. Stability of measured ion concentration of nitrogen in water samples is at least two hours, even with ammonium nitrate nitrogen it can be extended by conservation cold of samples.
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Evaluation of a switching device behaviour during short-circuit current
Fendrych, Martin ; Dostál, Lukáš (referee) ; Valenta, Jiří (advisor)
At work, I focused on the principle of electric arc extinction in low voltage devices. I particularly focused on the issue of magnetic switches. Next, I processed by the theory site issue of contact system in magnetic switches. In the practical part of my work, I was testing modular low voltage circuit breaker type of 2B and 10B. Testing was carried out in the laboratory of switchgear. I observed the movement of the contact and electric arc, which was burned between them and conductor wall. Observation was recorded by using a high-speed camera and an oscilloscope. Of acquired waveforms, I evaluated the dynamics of contacts, electric arc length and the value of the arc voltage for different moments.
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Modernization of the master clock for slave clocks controlling
Pokorný, Jiří ; Číž, Radim (referee) ; Krajsa, Ondřej (advisor)
This diploma thesis describes modernization of the master clock HN 50 created by company ELEKON, s.r.o. Master clock can be used for controlling of analog or digital slave clock or for switching school bells. Exact differences between old and new version of the clock are described and ways of synchronization and controlling of slave clock are explained. Main goal of modernization is applying the SMT technology for automation of production. Another problems and shortcomings of previous version are developed, such as new power supply structure, selection of a new microcontroller and usage of several different displays. Every problem is developed and new solutions are chosen. Last part of the document describes the software which is clarified on several flowcharts. Outputs of the thesis are complete schematics, printed circuit boards and 3D models of the modernized device.
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Test form Data Processing System
Purdjak, Jakub ; Ščuglík, František (referee) ; Ráb, Jaroslav (advisor)
The aim of this bachelor work is to develope the test form data processing system with the aid of relational database Oracle and environment Oracle Apex. The work analyses requirements of creating and processing test forms. It describes design and implementation of target system.
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Activity Tracking Tool for Windows Phone
Munk, Filip ; Kajan, Rudolf (referee) ; Herout, Adam (advisor)
This bachelor thesis describes the development of mobile application for Windows Phone focused on activity tracking. Result of my work is elegant and efective application, that functionality supports user’s fast interaction. Application allows to save exported data to SkyDrive.
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Java EE Organizer
Palát, Pavel ; Martinek, David (referee) ; Kočí, Radek (advisor)
This thesis deal with Java EE technologies and various subtechnologies of Java EE platform. This work is based on experience designing Java EE aplication network organizer with focus on technologies like DB connectivity (JPA, TopLink JPA), network enabled enterprise application design, remote accessing of bussiness logic in Java EE and security of the system as whole. Primary technologies used are Java EE 5 (core platform), Glassfish (application server), Firebird (database) and TopLink (ORM manager).
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AES Tolerance to Timing Analysis
Ondruš, Juraj ; Matyáš, Václav (referee) ; Cvrček, Daniel (advisor)
This thesis deals with timing analysis of the AES (Advanced Encryption Standard). The design of {\em Rijndael\/}, which is the AES algorithm, is described here. For the side channel attacks is necessary to know the principles of the cache memory in CPU and its architecture. In this thesis are involved major security problems of AES which can be used for successful attacks. Several different implementations of AES are discussed too. Several types of timing attaks are also described. According to the experimentations these attacks should be efficient to the most presently used AES implementations. Finally, the results of this work are described, possible countermeasures against this attack and motions for the next research.
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