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Assessment of thermal comfort in a low-energy family house with warm-air heating
Kos, Jan ; Forman, Matěj (referee) ; Jaroš, Michal (advisor)
The task of this master´s thesis is an evaluation of warm-air heating system in a low energy family house from the viewpoint of thermal comfort during winter season. The CFD simulation using CCM+ code was used for this purpose. The environment parameters in the central living room were evaluated for two variants – with underfloor heating and without it. The thermal comfort was evaluated using indices according ČSN EN ISO 7730 standard.
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Reconstruction of Water Treatment Plant Babice
Valchař, Jiří ; Roh, Robert (referee) ; Kučera, Tomáš (advisor)
This study deals with a reconstruction of the water treatment plant. The First chapter gives a brief overview of iron and manganese common removal methods. The next chapter looks at technical condition evaluation of urban water networks and presents a new methodology TEA Water developed by Brno University of Technology, module TEAT-Water Treatment Plants in particular. Following chapters describes local water distribution system and current condition of the water treatment plant. The main aim of this thesis is to choose the best suitable technologies for water treatment in order to reduce high operating expenses, especially energy consumption and to reduce volume of backwash water.
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Energy evaluation of apartment building.
Fečer, Tomáš ; Horák, Petr (referee) ; Adam, Pavel (advisor)
A goal of this Master's Thesis is an energy audit of an apartment building situated in Brno, the southmoravian region. The theoretical part is focused on a Czech Republic legislation, methods of an energy evaluation of houses and injurants of an internal microclimate. In the next part the main focus is on a processing of the energy audit of the apartment building. One of details of this processing is a design of precautions. From these, variants are created, focusing to choose the most economical and ecological one. The last part of this Master's Thesis is devoted to an usage of available software applications. Here are described computer programs, used for a creation of a 3D model. Also, a description of a calculation of thermal loses and the calculation of coefficients of heat transfer using a quasi-stationary technique is present. At the end a detailed description of one year simulation of the apartment building is provided.
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efficiency of the bottom elements on the supercritical flow energy dissipation
Knoflíček, Jakub ; Haluza,, Miloslav (referee) ; Šulc, Jan (advisor)
The thesis is dealing with comparing dissipation of the kinetic energy water flow using various bottom elements based on model research. There is missing information about efficiency of different kinds of bottom elements. This absence does not allow to compare different modification of the bottom of stilling basins. Within experimental research were measured depths in different variants. Based on the results of model tests are evaluated and tabulated sorted variants of the combat efficiency of the kinetic energy water flow. The results will be used for the efficient and economic design of additional alterations of stilling basins.
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Evaluation of Marketing Communication
Kučerová, Adéla ; Balcarová, Tereza (advisor) ; Jana, Jana (referee)
The theme of this thesis is to evaluate marketing communications, specifically with a focus on personal selling of the selected company.
The theoretical knowledge which concern this issues are contained in the first part of this work. Communication activity called personal selling is futher analyzed in this thesis.
The second part is devoted to the characteristics of Bohemia energy including its marketing communications, with a closer focus on personal selling as well. This part also contains evaluation of questionnaire survey, which was attended by 667 respondents. This survey was created to determine the level of quality of services provided by the sales representatives of this company. The results of the survey pointed to deficiencies in this communication activity and it also confirmed unfair behavior and practices of sales representatives. On the basis of evaluation of the questionnaire survey was proposed a few suggestions which could prevent already mentioned situations. Taking audio recordings with the customer´s consent or prearranged appointments could reduced the probability communicating of false information and at the same time improve the quality of the provided services.
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Identification of emotional state using speech signal analysis
Navrátil, Michal ; Atassi, Hicham (referee) ; Smékal, Zdeněk (advisor)
The diploma thesis deals with the analysis of human emotional states speaker by the help of analyse speech signals. The thesis has two parts. In the first part, the process of speech generating is described in addition to the description of the commonly used pre-processing methods such as denoising or preemphasis. The first part also deals with the major and minor prosody features, these features are: the fundamental frequency, energy, spectral features and time domain features such as the speech rate. The second part of this thesis deals with a task of emotion recognition from the speech signal. When we accumulate sufficient of the number of recordings emotive state will be able to rekognize emotive state with high probability. All project is prepared for use in real time. The last part of this thesis thesis contains description and results of the experiments made on a large number of speech records.
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Design of the expansion of 22 kV distribution network in a specific part of the city of Brno
Lakomý, Vojtěch ; Nepevná, Vlastimila (referee) ; Blažek, Vladimír (advisor)
The goal of this thesis is to design measures of the distribution network in Brno to ensure a supply of electricity to its consumers in required quantity, quality and reliability. This project will be solved in the program called PAS DAISY Off-Line v.4.00 Bizon. At first we make an analysis of the steady state of the distribution network. We check load of transformer stations 110/22 kV, overhead and cable lines if they operate in allowed limits. Then we complete or correct reserved power drains of big consumers of electricity in the model of distribution system. From the calculation of the steady state of the distribution network we will probably find out that some parts of the system are overloaded. Therefore we suggest changes for it (like switching over circuits, installation of new transformer stations and circuits), which should ensure safety and reliability of operations in the distribution system.
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Study of plasmachemical reduction of corrosive layers on copper
Šimšová, Tereza ; Selucká, Alena (referee) ; Krčma, František (advisor)
The present diploma thesis concerns the research of plasmachemical reduction of copper corrosion layers. The process was based on using low pressure hydrogen RF plasma in which copper samples are treated for several hours. Four series of copper corrosion layers were prepared in four different corrosion atmospheres. The first two were prepared using saturated vapors of HCl and ammonium acetate that affected copper samples for one week. The second two sets were prepared by samples dipping in HNO3 and H2SO4. EDX analysis confirms visual composition of corrosion layers – chlorides, nitrides and sulphate, respectively. The ammonium acetate produced no corrosion layers and thus this set of samples was omitted. The optical emission spectroscopy was used to find out reactions in a hydrogen RF discharge. At the first, a character of plasma without samples was taken by measuring in continuous and pulsed regime. The integral spectrum intensity (300-700 nm) and intensities of hydrogen atomic lines were observed in the dependences on hydrogen flow, power and duty cycle. After that copper samples were treaded under various conditions in continual and pulse regime, typically at pressure of 170 Pa, 200 W power and hydrogen flow rate of 10.2 ml/min. The integral OH radical spectral intensity in the range of 305 – 330 nm was used as a monitor of plasma treatment process. The experimental results showed that intensities of OH radical depended strongly on the corrosion layer kind as well as on the RF discharge mode. Reduction of corrosion layers treated in the pulsed regime was not so satisfactory then in the continuous regime probably due to lower temperature of sample during the treatment. The total supplied energy into the system was also lower in this case. The sample sputtering was observed during the reduction in continuous regime. It means the corrosion was successfully removed but the process was not stopped at that moment, so it is necessary to propose another additional monitoring process besides observing OH radicals. Our experimental results are the first step in the spread research of plasmachemical treatment of copper made archaeological artifacts.
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The effect of biotic stress on the metabolism of saccharides in tobacco plants (Nicotiana tabacum L.)
Kloudová, Kateřina ; Ryšlavá, Helena (advisor) ; Tichá, Marie (referee)
Plants have developed a number of ways how to minimise negative influence of the environment. As a consequence of stress action, plants carbohydrate metabolism is quite often influenced, esp. on the level of expression and activities of different enzymes and also several metabolites concentration. One of key enzymes of carbohydrate metabolism is invertase. The aim of this work was to find out, whether the activity of its isoforms (cytoplasmic, vacuolar and extracellular) in tobacco plants is influenced by Potato virus Y (PVY). It was shown, that activity of cytoplasmic invertase was not affected, but the activity of vacuolar and extracellular isoform was enhanced during potyviral infection. Hence, it is likely, that vacuolar and extracellular invertases are related to plant antiviral defence. The effect of PVY on other enzymes of carbohydrate metabolism and several metabolites content was studied. Activity of α-amylase and phosphorylase, starch-degrading enzymes, was strongly enhanced during potyviral infection. That is probably how plant cells get glucose, which is a key source of energy and metabolites for biosynthesis of different compounds. It may also serve as a signal molecule. Activity of other hydrolytic enzymes, β-glucosidase and β-hexosaminidase, was also slightly increased. There was no...
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Perpectives of crude oil market developement
Vosková, Michala ; Lukáš, Zdeněk (advisor) ; Kalínská, Emílie (referee)
Crude oil is an important commodity of world trade and it has become an essential part of everyday life. It is a necessary condition of economic growth, which in the current situation of economic boom of China, India and other developing countries entails an economically, ecologically, socially and geopolitically unsustainable problem. The turbulent sequence of past events on the crude oil market only foreshadows the future development that is going to occure after achieving the crude oil production peak. The following irreversible changes will be more revolutionary than evolutional. The era of cheap oil will parish and the 21st century is going to be distinguished by fights for energy and resources. This is one of the reasons why many renowned institutions and organisations are concerned with these questions, trying to predict future scenarios and find feasible solutions. The world needs secure, renewable and environmentally friendly energy sources, however crude oil is unfortunately none of them. Radical transition from crude oil economy to a clean alternative one, that is probably the most suitable solution to current situation, will require engagement of governments, organisations and individuals as well. It is an inevitable step of preserving the world for humanity and the coming generations. Crude oil market perspectives are quite well foreseeable for the coming decades, questionable remains only the proper solution of the rising problems and action of taking the correct steps in the right direction.
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