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Steam Turbine for Compressor Drive
Beran, Petr ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
The goal of this diploma thesis is design of steam turbine for driving a compressor with mechanical power of 25 MW, while using a standard API 612. In the first chapter of this work there is calculation of the steam mass flow about value of 23.17 kg/s, the next chapter deals with the design of control stage with the diameter of 0.715 m, inner power of 1673.6 kW and thermodynamic efficiency of 68 %. The following chapter includes thermodynamic calculation of stage part about power of 26.37 MW at designed rotation speed 5722.5 rpm which corresponds to 105 % of rated speed and thermodynamic efficiency 84 %. For control stage and stage part there is a strength calculation control. The thesis also includes basic design of gland sealing system, the design of balance piston with diameter of 0.543 m and the choosing of axial and radial bearings due to acting forces. The conclusion chapter deals with operating characteristic of designed steam turbine. The thesis includes mechanical drawing of turbine.
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An Influence Of Conductive Component Composition
On Gel Polymer Electrolyte Properties
Veselkova, Iuliia
This paper deals with searching of gel polymer electrolytes, which can be used as replacement of liquid electrolyte in lithium batteries and supercapacitors. The research reports how different salts and solvents affect mechanical, electrochemical and electrical properties of gel electrolytes. For measurement electrical and electrochemical properties were used methods such as impedance spectroscopy and cyclic voltammetry to calculate electrical conductivity and potential window respectively. Results indicate which chemical composition of gel polymer electrolyte theoretical can be work in electrochemical cell instead of liquid electrolyte.
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Recommendations for ECG Acquisition Using BITalino
Němcová, Andrea ; Maršánová, Lucie ; Smíšek, Radovan
Cardiovascular disorders are still the most common cause of death in Western countries. In addition to cardiologists´ care, patient self-examination is the growing area nowadays. For this purpose, mobile devices for ECG signal acquisition are suitable. From these devices, we selected low-cost system called BITalino. In this work, we tested the quality of ECG signals acquired with BITalino under various conditions. We tested 2 values of sampling frequency, 12 electrodes placements and 6 types of exercises. We recommend using sampling frequency of 1,000 Hz, two electrodes placements – on chest and on wrists for both resting and exercise ECG.
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Pivovarnictví v ČR po roce 1989 - globalizace versus ekonomická lokalizace
VÉBROVÁ, Lucie
The bachelor's thesis discusses the economic globalization and the economic localization and their influence on the development of the brewing industry in the Czech republic after 1989. These two above mentioned processes are described in this paper, where the emphasis is placed on basic manifestations of economic globalization and economic localization in the Czech brewing industry. Economic globalization has an impact on industrial breweries in the Czech republic most of which are owned by transnational corporations. Economic localization represents relatively new trend in the industry manifested by the establishment of microbreweries. Further of the analysis of the breweries in the Czech republic was done from available data and information where factors of the economic globalization and the economic localization are highlighted. Data of industrial breweries and microbreweries in sectional years 1989, 2000 and 2015 were used for the analysis.
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Social networks in the lives of teenagers
Zíka, Vojtěch ; Wolák, Radim (advisor) ; Fišerová, Sylvie (referee)
The main aim of this bachelor thesis is to discover what role the SNS (Social Network Sites) and the Internet play in lives of today's teenagers. Primarily, how much time this age group devotes to those phenomenons mentioned above, what importance it assignes to them and what attitude teenagers, their parents and teachers assume to risks bound to life in an online world. The theoretical framework of the thesis is based on, apart from setting this topic into the historical context of the evolution of the Internet and SNS, most importantly on the work of danah boyd, Sonia Livingstone and Zeynep Tufekci. There are, among others, distinguished the types of SNS, analysed the reasons for using the SNS, described the most frequent risks associated with use of the Internet, but also clarified some of the rumours and myths usualy connected with the online world. Moreover, in the theoretical part I introduce the actual deviding of SNS according to the extent of anonymity of the users of Anonymous SNS, Quasi-Anonymous SNS and Non-Anonymous SNS. This deviding is based on the application of internal institutions according to Stefan Voigt in the Internet environment. The research part, based on a quantitative survey (n=543), analyses the situation of the Czech teenagers studying at secondary grammar schools in...
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The relationship between plant diversity and diversity of abiotic conditions in Křivoklátsko PLA
Valtr, Vojtěch ; Chuman, Tomáš (advisor) ; Jačková, Kateřina (referee)
The relationship between plant diversity and diversity of abiotic conditions in Křivoklátsko PLA Abstract The relation between plants and abiotic conditions has a great influence for their lives and distribution. In first part I describe influence of individual physical-geographic factors on plant diversity and distribution. These are climate, soils, relief, disturbances and ecophenomenons. In second part we learn about biodiversity gradients. These are size and remoteness of habitats thus island phenomenon, altitudinal gradient and latitudinal gradient. In the next part, I present a place, where I evaluate relation between plant diversity and altitude, slope and exposition. In Křivoklátsko PLA there is 1 543 species of vascular plants. With their distribution in area I found out the highest diversity is in the rivers and creek valleys, especially in Berounka valley. The results clearly say the diversity of vascular plant is in the deep valleys because of river phenomenon. The biggest influence on vascular plant has altitude. Two remains factors don't influence plant diversity as altitude.
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Earth fault relay testing
Herůfek, Radek ; Topolánek, David (referee) ; Orságová, Jaroslava (advisor)
Bachelor thesis deals with an earth fault relay in compensated medium voltage distribution network. At the beginning of the thesis is described the method of operation compensated system and its advantages and disadvantages of using it. In addition, there is explained the definition of the ground fault, its types and there is outlined the method of solution asymmetrical single-phase fault. Thoroughly there is characterized distribution of voltages and currents, which is important for determination of affected and unaffected outlet. Among others, there is described the mode of action the arc suppression coil on caused fault current and also there are presented the auxiliary systems automation. In the next part the basic requirements for protections and its basic kinds are described. Finally the theoretical part describes principle of the earth fault relays and is presented means and methods used for indicate an affected outlet and earth fault localization. In the practical part, follows more detailed description of the protection REM 543 and testing equipment OMICRON CMC 256 +. In addition, there is explained connection process and setting selected functions and modules for testing earth fault relay. Assessment of generated and played transient disturbance records at the end.
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Negative-Phase-Sequence Protection of Generator
Babík, Peter ; Novotný, Jan (referee) ; Orságová, Jaroslava (advisor)
This bachelor thesis deals with the effect of unbalanced load on a generator and principles of its protection. At first the characterization of operating failures and generator's abnormalities are described. Further the analysis of unbalance in electric system and its effect on the generator is presented, especially the effect of negative phase sequence on the armature. The end of the theoretical section deals with the principles of unbalanced load protection. In the practical part the punctual characterization of used apparatus is presented, namely the machine terminal REM 543 and a tester Omicron CMC 353. Furthermore the individual settings of each apparatus are discussed along with the testing of chosen negative phase sequence protection.
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Parachute Emergency Systems for Very Light Sport Planes
Šorf, Oldřich ; Salga, Jaroslav (referee) ; Daněk, Vladimír (referee) ; Třetina, Karel (advisor)
This PhD thesis describes parachute rescue systems for small planes and focuses on their functionality in the border areas of the flight envelope, especially at very low altitudes and low airspeeds of flight (fall). For extending the functionality of the rescue system in extreme areas of usability envelope, was founded an innovative dividable parachute slider, which works normally at high speed, but at the low airspeeds does not limit the opening time of the canopy. Structural design of this slider is the subject of a new patent application “Parachute opening speed regulation device”, filed with Industrial property Office in Prague on August 14, 2014 under number 2014-543 PV. The PhD thesis further contains computational principle of circular parachute opening and the structural design. For verification of the dividable slider functionality, a parachute model has been constructed and subjected to a series of drop tests. The main benefit of the PhD thesis is extending the usability of rescue system into its statistically most frequent use, i.e. into low altitudes and low airspeeds of flight (fall).
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