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Improvement of Manganese Separation in Drinking Water Treatment
Bartoš, Ladislav ; Janda, Václav (referee) ; Hlaváč, Jaroslav (referee) ; Dolejš, Petr (advisor)
The submitted paper covers manganese comprehensively. The introduction provides an overview of its basic physical and chemical properties. Its compounds are discussed individually, including their preparation, production, and practical uses. Furthermore, a list of analytical methods in which manganese is involved in the form of its compounds as reagents is included. The same section includes an overview of analytical methods whereby manganese and its compounds are detected, primarily in water industry processes. Attention is paid to manganese as a non-negligible constituent of the various parts of the environment. The section on manganese’s biogenic properties is interesting from the viewpoint of its toxicity as well as its role as an important biogenic element, indispensable primarily for mammals. The subsequent chapters discuss the various methods which are suitable, under specific conditions, for separation in the treatment of surface and underground water aimed at producing drinking, process, or industrial water, where a minimal concentration of this metal is required. The impact of the physical/chemical conditions which influence the efficiency of separation in a manner ranging from non-negligible to principal, is discussed further on. Given the specifics of treatment of surface [and] underground water, the chapters provide more details on the processes suitable for specific types of matrix and specific conditions. Next chapters sum up many years of the author’s observations and experiences in the various parts of the water management system, from the raw water source to treatment to distribution, focusing on surface and underground water separately. Last chapter describes the construction of a water treatment plant model, its launch and calibration, and the tests focused on separating manganese by way of coagulation using aluminium and iron sulphate.
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Business plan - Help one, s. r. o.
Oberreiterová, Dana ; Hlaváč, Jakub (referee) ; Koleňák, Jiří (advisor)
The aim of this work is to invent a business plan for beginning company HELP ONE, s. r. o., which offers complete services to the people who have been damaged by a car crash. On the other hand, this work also shows all possible problems that can appear from the middle position between insurance company and ordinary people and eventually to find a suitable investor.
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Design of presentation electric switchboard for LV
Hlaváč, Jan ; Štefanov, Marek (referee) ; Bátora, Branislav (advisor)
This master’s thesis deals with the design of electric switchgear for low voltage, which will serve for presentation purposes. The switchgear is analogy of the modular system MNS 3.0, which includes the latest equipment of ABB Ltd. that is currently available on the market. Switchgears of this type are widely used in industry primarily for controlling motor units. For this reason, in the switchgear there are located motor starters in various performances, as well as distribution modules. In addition, the switchgear has an automatic transfer switch function in case of failure of one of the power supplies. The complete documentation of the switchgear is processed in the professional software EPLAN Electric P8 with use of the 3D software EPLAN Pro Panel for modelling device compartments. The final part of the thesis is the calculation of the maximum cable lengths that a potential customer can connect to the switchgear. In addition, an analysis of the power and control circuits was carried out for voltage drop calculations, as well as the effect of these voltage drops and capacitance of long control cables on the actuation of contactors.
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A proposal of web site to support tourist trade development
Kostková, Mária ; Hlaváč, Jozef (referee) ; Kříž, Jiří (advisor)
The goal of the submitted thesis: "A proposal of web sites to support tourist trade development" is to creation web sites of chapelry and design database MySQL for cooperating with web sites. The thesis has to three main parts. The first part is concetrated on theory of HTML, XHTML, PHP and MySQL. There is a primary data about chapelry and its problems with tourist trade in the second. And the last part is concentrated on design particular database and usage dates for the web sites of chapelry and development of tourist trade in a given area.
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Verification and testing of the experimental model of 22 kV distribution system
Hlaváč, Jan ; Novotný, Jan (referee) ; Topolánek, David (advisor)
This bachelor’s thesis deals with the practical verification of the various elements of the model of 22 kV distribution system. This model was designed within the laboratory space to remind of the most realistic distribution system. User of the model can (besides the normal operating conditions) perform a simulation of a fault condition. The aim of the work is to create guidelines for measuring key parameters of the system components (transformers, power lines), to compare the designed a measured values and to create the complete assembly documentation. This documentation serves as a guide with the detailed description of each component. The final part of the work is to create a complete schematic diagram of the power substation and the selection of the suitable protective devices.
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Dissolved Air Flotation – From Pilot Plant to Full Scale Implementation
Dobiáš, Pavel ; Hlaváč, Jaroslav (referee) ; Janda,, Václav (referee) ; Vávrová, Milada (referee) ; Dolejš, Petr (advisor)
The thesis deals with the use of dissolved air flotation (DAF) in water treatment technology in the Czech Republic. It summarizes the knowledge gained at pilot plant studies as well as the experience with full-scale flotation units which have been built in potable water treatment plants in the Czech Republic in years 2006-2018. This thesis provides a broad background of experimental studies of a modern separation process, which does have great advantages in the removal of natural organic matter and microorganisms from water in the drinking water treatment industry. In this thesis, there are presented some examples of the excellent efficiency of the microorganisms removal, both under the experimental conditions as well as water treatment plants, which were improved by DAF units installation in full scale. In addition to the high separation efficiency, it is shown, how DAF units could influence the subsequent separation steps as for example filtration through the granular media. The negative influence of the pre-ozonization on the DAF separation efficiency in Hradec Králové WTP is demonstrated too. The results of the pilot experiments support the idea, that the key condition for high removal efficiency is the optimal coagulation process chemistry. Design of pilot experiments was based on the factorial planning theory and some results are discussed in this thesis. The very big portion of the pilot experiments was made for estimating of the full-scale DAF design parameters before the water treatment plants reconstruction phase
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Use, assembly, operation and maintenance of the UNIMAT 1 Elementary kit
HLAVÁČ, Josef
The aim of the bachelor thesis is to identify the appropriate use of the Unimat 1 Elementary kit in primary school. It also focuses in detail on the operation and maintenance of the kit and is intended to provide useful information for all those involved with the kit. The paper describes the construction of each type of kit, the assembly and disassembly procedure, safety recommendations and last but not least the maintenance of the kit. The second part of the thesis will be devoted to the description of the individual components of the kit and their functions. It will also focus on the practical aspects of the operation of the kit, recommendations for safe work with the kit and examples of its possible use in practice. This work should serve as a comprehensive guide for all those who encounter this product and help them to gain a comprehensive view of its operation and maintenance.
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Results of extended research of the ichthyofauna of lakes Laka and Čertovo, including adjacent streams.
Blabolil, Petr ; Hlaváč, J. ; Hůda, J. ; Kolařík, Tomáš ; Kortan, D. ; Muška, Milan ; Peterka, Jiří ; Vrba, Jaroslav
The report describes the results of an ichthyofauna survey in two areas of the Šumava National Park, where catches were made by an electric generator in the spring of 2021. This is the first direct evidence of natural reproduction of brown trout in the parts previously heavily affected by acidification.
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The performance of the Czech Private Pension scheme: Current Design and its position within CEE countries
Hlaváč, Jan ; Schneider, Ondřej (advisor) ; Benáček, Vladimír (referee)
This thesis focuses on the comparison of financial performance of the Czech voluntary private pension scheme with five other reformed private pension schemes in the region of Central Eastern Europe (Bulgaria, Croatia, Hungary, Poland and Slovak Republic). The current state and the recent development of the Czech private pension scheme are analyzed in the first part of the thesis. In the main part of this work we construct the dataset of periodic scheme returns covering the last decade, and estimate the schemes Sharpe ratios (SR) for four reference benchmarks. To complement the analysis we also employ the Sharpe style analysis to evaluate the impact of managerial decisions of market selection/timing on the scheme returns. The findings suggest that except for Poland none of the schemes managed to beat its long-term domestic benchmark (10-year government bonds) as the SRs estimates turn out to be negative. The highest underperformance was found in the case of Czech Republic. The results of style analysis suggest a modest positive influence of the active managerial decisions on the scheme returns with respect to the passive investment strategies.
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Transition metal complexes catalyzed synthesis of biologically active estrone derivatives
Prchalová, Eva ; Kotora, Martin (advisor) ; Moravcová, Jitka (referee) ; Hlaváč, Jan (referee)
This thesis relates to the preparation and use of new non-estrogenic ligands selective for certain types of the 17β-hydroxysteroid dehydrogenase superfamily (17βHSD). Such nonestrogenic compounds, which selectively regulate the activity of 17βHSD are believed to offer new solutions in endocrine therapy, diagnosis and treatment of estrogen-dependent types of diseases. In recent years in the laboratories of my supervisor prof. Kotora differently substituted steroid derivatives with interesting biological properties were prepared. Based on the gained experiences, it was decided to prepare C-15 estrone derivatives. Such compounds are mostly unexplored, and therefore they might be a new class of interesting biologically active compounds. A method was developed for the preparation of C-15 estrone derivatives. Estrone, the starting material for the synthesis, was first converted to the appropriate intermediate, protected estra-1,3,5(10),15-tetraene-17-one. Conjugate addition of vinylmagnesium bromide to this enone yielded the starting material for further reactions, 15β-vinylestrone. Cross metathesis of 15β-vinylestrone with suitable terminal olefins provided large series of C-15 estrone derivatives with perfluoroalkylated, aliphatic and aromatic side chains. Selected unsaturated derivatives were tested...
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